sound/core/oss/pcm_oss.c

   1 /*
   2  *  Digital Audio (PCM) abstract layer / OSS compatible
   3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #if 0
  23 #define PLUGIN_DEBUG
  24 #endif
  25 #if 0
  26 #define OSS_DEBUG
  27 #endif
  28
  29 #include <linux/init.h>
  30 #include <linux/slab.h>
  31 #include <linux/time.h>
  32 #include <linux/vmalloc.h>
  33 #include <linux/module.h>
  34 #include <linux/math64.h>
  35 #include <linux/string.h>
  36 #include <linux/compat.h>
  37 #include <sound/core.h>
  38 #include <sound/minors.h>
  39 #include <sound/pcm.h>
  40 #include <sound/pcm_params.h>
  41 #include "pcm_plugin.h"
  42 #include <sound/info.h>
  43 #include <linux/soundcard.h>
  44 #include <sound/initval.h>
  45 #include <sound/mixer_oss.h>
  46
  47 #define OSS_ALSAEMULVER         _SIOR ('M', 249, int)
  48
  49 static int dsp_map[SNDRV_CARDS];
  50 static int adsp_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
  51 static bool nonblock_open = 1;
  52
  53 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
  54 MODULE_DESCRIPTION("PCM OSS emulation for ALSA.");
  55 MODULE_LICENSE("GPL");
  56 module_param_array(dsp_map, int, NULL, 0444);
  57 MODULE_PARM_DESC(dsp_map, "PCM device number assigned to 1st OSS device.");
  58 module_param_array(adsp_map, int, NULL, 0444);
  59 MODULE_PARM_DESC(adsp_map, "PCM device number assigned to 2nd OSS device.");
  60 module_param(nonblock_open, bool, 0644);
  61 MODULE_PARM_DESC(nonblock_open, "Don't block opening busy PCM devices.");
  62 MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_PCM);
  63 MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_PCM1);
  64
  65 static int snd_pcm_oss_get_rate(struct snd_pcm_oss_file *pcm_oss_file);
  66 static int snd_pcm_oss_get_channels(struct snd_pcm_oss_file *pcm_oss_file);
  67 static int snd_pcm_oss_get_format(struct snd_pcm_oss_file *pcm_oss_file);
  68
  69 static inline mm_segment_t snd_enter_user(void)
  70 {
  71         mm_segment_t fs = get_fs();
  72         set_fs(get_ds());
  73         return fs;
  74 }
  75
  76 static inline void snd_leave_user(mm_segment_t fs)
  77 {
  78         set_fs(fs);
  79 }
  80
  81 /*
  82  * helper functions to process hw_params
  83  */
  84 static int snd_interval_refine_min(struct snd_interval *i, unsigned int min, int openmin)
  85 {
  86         int changed = 0;
  87         if (i->min < min) {
  88                 i->min = min;
  89                 i->openmin = openmin;
  90                 changed = 1;
  91         } else if (i->min == min && !i->openmin && openmin) {
  92                 i->openmin = 1;
  93                 changed = 1;
  94         }
  95         if (i->integer) {
  96                 if (i->openmin) {
  97                         i->min++;
  98                         i->openmin = 0;
  99                 }
 100         }
 101         if (snd_interval_checkempty(i)) {
 102                 snd_interval_none(i);
 103                 return -EINVAL;
 104         }
 105         return changed;
 106 }
 107
 108 static int snd_interval_refine_max(struct snd_interval *i, unsigned int max, int openmax)
 109 {
 110         int changed = 0;
 111         if (i->max > max) {
 112                 i->max = max;
 113                 i->openmax = openmax;
 114                 changed = 1;
 115         } else if (i->max == max && !i->openmax && openmax) {
 116                 i->openmax = 1;
 117                 changed = 1;
 118         }
 119         if (i->integer) {
 120                 if (i->openmax) {
 121                         i->max--;
 122                         i->openmax = 0;
 123                 }
 124         }
 125         if (snd_interval_checkempty(i)) {
 126                 snd_interval_none(i);
 127                 return -EINVAL;
 128         }
 129         return changed;
 130 }
 131
 132 static int snd_interval_refine_set(struct snd_interval *i, unsigned int val)
 133 {
 134         struct snd_interval t;
 135         t.empty = 0;
 136         t.min = t.max = val;
 137         t.openmin = t.openmax = 0;
 138         t.integer = 1;
 139         return snd_interval_refine(i, &t);
 140 }
 141
 142 /**
 143  * snd_pcm_hw_param_value_min
 144  * @params: the hw_params instance
 145  * @var: parameter to retrieve
 146  * @dir: pointer to the direction (-1,0,1) or NULL
 147  *
 148  * Return the minimum value for field PAR.
 149  */
 150 static unsigned int
 151 snd_pcm_hw_param_value_min(const struct snd_pcm_hw_params *params,
 152                            snd_pcm_hw_param_t var, int *dir)
 153 {
 154         if (hw_is_mask(var)) {
 155                 if (dir)
 156                         *dir = 0;
 157                 return snd_mask_min(hw_param_mask_c(params, var));
 158         }
 159         if (hw_is_interval(var)) {
 160                 const struct snd_interval *i = hw_param_interval_c(params, var);
 161                 if (dir)
 162                         *dir = i->openmin;
 163                 return snd_interval_min(i);
 164         }
 165         return -EINVAL;
 166 }
 167
 168 /**
 169  * snd_pcm_hw_param_value_max
 170  * @params: the hw_params instance
 171  * @var: parameter to retrieve
 172  * @dir: pointer to the direction (-1,0,1) or NULL
 173  *
 174  * Return the maximum value for field PAR.
 175  */
 176 static unsigned int
 177 snd_pcm_hw_param_value_max(const struct snd_pcm_hw_params *params,
 178                            snd_pcm_hw_param_t var, int *dir)
 179 {
 180         if (hw_is_mask(var)) {
 181                 if (dir)
 182                         *dir = 0;
 183                 return snd_mask_max(hw_param_mask_c(params, var));
 184         }
 185         if (hw_is_interval(var)) {
 186                 const struct snd_interval *i = hw_param_interval_c(params, var);
 187                 if (dir)
 188                         *dir = - (int) i->openmax;
 189                 return snd_interval_max(i);
 190         }
 191         return -EINVAL;
 192 }
 193
 194 static int _snd_pcm_hw_param_mask(struct snd_pcm_hw_params *params,
 195                                   snd_pcm_hw_param_t var,
 196                                   const struct snd_mask *val)
 197 {
 198         int changed;
 199         changed = snd_mask_refine(hw_param_mask(params, var), val);
 200         if (changed) {
 201                 params->cmask |= 1 << var;
 202                 params->rmask |= 1 << var;
 203         }
 204         return changed;
 205 }
 206
 207 static int snd_pcm_hw_param_mask(struct snd_pcm_substream *pcm,
 208                                  struct snd_pcm_hw_params *params,
 209                                  snd_pcm_hw_param_t var,
 210                                  const struct snd_mask *val)
 211 {
 212         int changed = _snd_pcm_hw_param_mask(params, var, val);
 213         if (changed < 0)
 214                 return changed;
 215         if (params->rmask) {
 216                 int err = snd_pcm_hw_refine(pcm, params);
 217                 if (err < 0)
 218                         return err;
 219         }
 220         return 0;
 221 }
 222
 223 static int _snd_pcm_hw_param_min(struct snd_pcm_hw_params *params,
 224                                  snd_pcm_hw_param_t var, unsigned int val,
 225                                  int dir)
 226 {
 227         int changed;
 228         int open = 0;
 229         if (dir) {
 230                 if (dir > 0) {
 231                         open = 1;
 232                 } else if (dir < 0) {
 233                         if (val > 0) {
 234                                 open = 1;
 235                                 val--;
 236                         }
 237                 }
 238         }
 239         if (hw_is_mask(var))
 240                 changed = snd_mask_refine_min(hw_param_mask(params, var),
 241                                               val + !!open);
 242         else if (hw_is_interval(var))
 243                 changed = snd_interval_refine_min(hw_param_interval(params, var),
 244                                                   val, open);
 245         else
 246                 return -EINVAL;
 247         if (changed) {
 248                 params->cmask |= 1 << var;
 249                 params->rmask |= 1 << var;
 250         }
 251         return changed;
 252 }
 253
 254 /**
 255  * snd_pcm_hw_param_min
 256  * @pcm: PCM instance
 257  * @params: the hw_params instance
 258  * @var: parameter to retrieve
 259  * @val: minimal value
 260  * @dir: pointer to the direction (-1,0,1) or NULL
 261  *
 262  * Inside configuration space defined by PARAMS remove from PAR all
 263  * values < VAL. Reduce configuration space accordingly.
 264  * Return new minimum or -EINVAL if the configuration space is empty
 265  */
 266 static int snd_pcm_hw_param_min(struct snd_pcm_substream *pcm,
 267                                 struct snd_pcm_hw_params *params,
 268                                 snd_pcm_hw_param_t var, unsigned int val,
 269                                 int *dir)
 270 {
 271         int changed = _snd_pcm_hw_param_min(params, var, val, dir ? *dir : 0);
 272         if (changed < 0)
 273                 return changed;
 274         if (params->rmask) {
 275                 int err = snd_pcm_hw_refine(pcm, params);
 276                 if (err < 0)
 277                         return err;
 278         }
 279         return snd_pcm_hw_param_value_min(params, var, dir);
 280 }
 281
 282 static int _snd_pcm_hw_param_max(struct snd_pcm_hw_params *params,
 283                                  snd_pcm_hw_param_t var, unsigned int val,
 284                                  int dir)
 285 {
 286         int changed;
 287         int open = 0;
 288         if (dir) {
 289                 if (dir < 0) {
 290                         open = 1;
 291                 } else if (dir > 0) {
 292                         open = 1;
 293                         val++;
 294                 }
 295         }
 296         if (hw_is_mask(var)) {
 297                 if (val == 0 && open) {
 298                         snd_mask_none(hw_param_mask(params, var));
 299                         changed = -EINVAL;
 300                 } else
 301                         changed = snd_mask_refine_max(hw_param_mask(params, var),
 302                                                       val - !!open);
 303         } else if (hw_is_interval(var))
 304                 changed = snd_interval_refine_max(hw_param_interval(params, var),
 305                                                   val, open);
 306         else
 307                 return -EINVAL;
 308         if (changed) {
 309                 params->cmask |= 1 << var;
 310                 params->rmask |= 1 << var;
 311         }
 312         return changed;
 313 }
 314
 315 /**
 316  * snd_pcm_hw_param_max
 317  * @pcm: PCM instance
 318  * @params: the hw_params instance
 319  * @var: parameter to retrieve
 320  * @val: maximal value
 321  * @dir: pointer to the direction (-1,0,1) or NULL
 322  *
 323  * Inside configuration space defined by PARAMS remove from PAR all
 324  *  values >= VAL + 1. Reduce configuration space accordingly.
 325  *  Return new maximum or -EINVAL if the configuration space is empty
 326  */
 327 static int snd_pcm_hw_param_max(struct snd_pcm_substream *pcm,
 328                                 struct snd_pcm_hw_params *params,
 329                                 snd_pcm_hw_param_t var, unsigned int val,
 330                                 int *dir)
 331 {
 332         int changed = _snd_pcm_hw_param_max(params, var, val, dir ? *dir : 0);
 333         if (changed < 0)
 334                 return changed;
 335         if (params->rmask) {
 336                 int err = snd_pcm_hw_refine(pcm, params);
 337                 if (err < 0)
 338                         return err;
 339         }
 340         return snd_pcm_hw_param_value_max(params, var, dir);
 341 }
 342
 343 static int boundary_sub(int a, int adir,
 344                         int b, int bdir,
 345                         int *c, int *cdir)
 346 {
 347         adir = adir < 0 ? -1 : (adir > 0 ? 1 : 0);
 348         bdir = bdir < 0 ? -1 : (bdir > 0 ? 1 : 0);
 349         *c = a - b;
 350         *cdir = adir - bdir;
 351         if (*cdir == -2) {
 352                 (*c)--;
 353         } else if (*cdir == 2) {
 354                 (*c)++;
 355         }
 356         return 0;
 357 }
 358
 359 static int boundary_lt(unsigned int a, int adir,
 360                        unsigned int b, int bdir)
 361 {
 362         if (adir < 0) {
 363                 a--;
 364                 adir = 1;
 365         } else if (adir > 0)
 366                 adir = 1;
 367         if (bdir < 0) {
 368                 b--;
 369                 bdir = 1;
 370         } else if (bdir > 0)
 371                 bdir = 1;
 372         return a < b || (a == b && adir < bdir);
 373 }
 374
 375 /* Return 1 if min is nearer to best than max */
 376 static int boundary_nearer(int min, int mindir,
 377                            int best, int bestdir,
 378                            int max, int maxdir)
 379 {
 380         int dmin, dmindir;
 381         int dmax, dmaxdir;
 382         boundary_sub(best, bestdir, min, mindir, &dmin, &dmindir);
 383         boundary_sub(max, maxdir, best, bestdir, &dmax, &dmaxdir);
 384         return boundary_lt(dmin, dmindir, dmax, dmaxdir);
 385 }
 386
 387 /**
 388  * snd_pcm_hw_param_near
 389  * @pcm: PCM instance
 390  * @params: the hw_params instance
 391  * @var: parameter to retrieve
 392  * @best: value to set
 393  * @dir: pointer to the direction (-1,0,1) or NULL
 394  *
 395  * Inside configuration space defined by PARAMS set PAR to the available value
 396  * nearest to VAL. Reduce configuration space accordingly.
 397  * This function cannot be called for SNDRV_PCM_HW_PARAM_ACCESS,
 398  * SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_HW_PARAM_SUBFORMAT.
 399  * Return the value found.
 400   */
 401 static int snd_pcm_hw_param_near(struct snd_pcm_substream *pcm,
 402                                  struct snd_pcm_hw_params *params,
 403                                  snd_pcm_hw_param_t var, unsigned int best,
 404                                  int *dir)
 405 {
 406         struct snd_pcm_hw_params *save = NULL;
 407         int v;
 408         unsigned int saved_min;
 409         int last = 0;
 410         int min, max;
 411         int mindir, maxdir;
 412         int valdir = dir ? *dir : 0;
 413         /* FIXME */
 414         if (best > INT_MAX)
 415                 best = INT_MAX;
 416         min = max = best;
 417         mindir = maxdir = valdir;
 418         if (maxdir > 0)
 419                 maxdir = 0;
 420         else if (maxdir == 0)
 421                 maxdir = -1;
 422         else {
 423                 maxdir = 1;
 424                 max--;
 425         }
 426         save = kmalloc(sizeof(*save), GFP_KERNEL);
 427         if (save == NULL)
 428                 return -ENOMEM;
 429         *save = *params;
 430         saved_min = min;
 431         min = snd_pcm_hw_param_min(pcm, params, var, min, &mindir);
 432         if (min >= 0) {
 433                 struct snd_pcm_hw_params *params1;
 434                 if (max < 0)
 435                         goto _end;
 436                 if ((unsigned int)min == saved_min && mindir == valdir)
 437                         goto _end;
 438                 params1 = kmalloc(sizeof(*params1), GFP_KERNEL);
 439                 if (params1 == NULL) {
 440                         kfree(save);
 441                         return -ENOMEM;
 442                 }
 443                 *params1 = *save;
 444                 max = snd_pcm_hw_param_max(pcm, params1, var, max, &maxdir);
 445                 if (max < 0) {
 446                         kfree(params1);
 447                         goto _end;
 448                 }
 449                 if (boundary_nearer(max, maxdir, best, valdir, min, mindir)) {
 450                         *params = *params1;
 451                         last = 1;
 452                 }
 453                 kfree(params1);
 454         } else {
 455                 *params = *save;
 456                 max = snd_pcm_hw_param_max(pcm, params, var, max, &maxdir);
 457                 if (max < 0) {
 458                         kfree(save);
 459                         return max;
 460                 }
 461                 last = 1;
 462         }
 463  _end:
 464         kfree(save);
 465         if (last)
 466                 v = snd_pcm_hw_param_last(pcm, params, var, dir);
 467         else
 468                 v = snd_pcm_hw_param_first(pcm, params, var, dir);
 469         return v;
 470 }
 471
 472 static int _snd_pcm_hw_param_set(struct snd_pcm_hw_params *params,
 473                                  snd_pcm_hw_param_t var, unsigned int val,
 474                                  int dir)
 475 {
 476         int changed;
 477         if (hw_is_mask(var)) {
 478                 struct snd_mask *m = hw_param_mask(params, var);
 479                 if (val == 0 && dir < 0) {
 480                         changed = -EINVAL;
 481                         snd_mask_none(m);
 482                 } else {
 483                         if (dir > 0)
 484                                 val++;
 485                         else if (dir < 0)
 486                                 val--;
 487                         changed = snd_mask_refine_set(hw_param_mask(params, var), val);
 488                 }
 489         } else if (hw_is_interval(var)) {
 490                 struct snd_interval *i = hw_param_interval(params, var);
 491                 if (val == 0 && dir < 0) {
 492                         changed = -EINVAL;
 493                         snd_interval_none(i);
 494                 } else if (dir == 0)
 495                         changed = snd_interval_refine_set(i, val);
 496                 else {
 497                         struct snd_interval t;
 498                         t.openmin = 1;
 499                         t.openmax = 1;
 500                         t.empty = 0;
 501                         t.integer = 0;
 502                         if (dir < 0) {
 503                                 t.min = val - 1;
 504                                 t.max = val;
 505                         } else {
 506                                 t.min = val;
 507                                 t.max = val+1;
 508                         }
 509                         changed = snd_interval_refine(i, &t);
 510                 }
 511         } else
 512                 return -EINVAL;
 513         if (changed) {
 514                 params->cmask |= 1 << var;
 515                 params->rmask |= 1 << var;
 516         }
 517         return changed;
 518 }
 519
 520 /**
 521  * snd_pcm_hw_param_set
 522  * @pcm: PCM instance
 523  * @params: the hw_params instance
 524  * @var: parameter to retrieve
 525  * @val: value to set
 526  * @dir: pointer to the direction (-1,0,1) or NULL
 527  *
 528  * Inside configuration space defined by PARAMS remove from PAR all
 529  * values != VAL. Reduce configuration space accordingly.
 530  *  Return VAL or -EINVAL if the configuration space is empty
 531  */
 532 static int snd_pcm_hw_param_set(struct snd_pcm_substream *pcm,
 533                                 struct snd_pcm_hw_params *params,
 534                                 snd_pcm_hw_param_t var, unsigned int val,
 535                                 int dir)
 536 {
 537         int changed = _snd_pcm_hw_param_set(params, var, val, dir);
 538         if (changed < 0)
 539                 return changed;
 540         if (params->rmask) {
 541                 int err = snd_pcm_hw_refine(pcm, params);
 542                 if (err < 0)
 543                         return err;
 544         }
 545         return snd_pcm_hw_param_value(params, var, NULL);
 546 }
 547
 548 static int _snd_pcm_hw_param_setinteger(struct snd_pcm_hw_params *params,
 549                                         snd_pcm_hw_param_t var)
 550 {
 551         int changed;
 552         changed = snd_interval_setinteger(hw_param_interval(params, var));
 553         if (changed) {
 554                 params->cmask |= 1 << var;
 555                 params->rmask |= 1 << var;
 556         }
 557         return changed;
 558 }
 559
 560 /*
 561  * plugin
 562  */
 563
 564 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
 565 static int snd_pcm_oss_plugin_clear(struct snd_pcm_substream *substream)
 566 {
 567         struct snd_pcm_runtime *runtime = substream->runtime;
 568         struct snd_pcm_plugin *plugin, *next;
 569
 570         plugin = runtime->oss.plugin_first;
 571         while (plugin) {
 572                 next = plugin->next;
 573                 snd_pcm_plugin_free(plugin);
 574                 plugin = next;
 575         }
 576         runtime->oss.plugin_first = runtime->oss.plugin_last = NULL;
 577         return 0;
 578 }
 579
 580 static int snd_pcm_plugin_insert(struct snd_pcm_plugin *plugin)
 581 {
 582         struct snd_pcm_runtime *runtime = plugin->plug->runtime;
 583         plugin->next = runtime->oss.plugin_first;
 584         plugin->prev = NULL;
 585         if (runtime->oss.plugin_first) {
 586                 runtime->oss.plugin_first->prev = plugin;
 587                 runtime->oss.plugin_first = plugin;
 588         } else {
 589                 runtime->oss.plugin_last =
 590                 runtime->oss.plugin_first = plugin;
 591         }
 592         return 0;
 593 }
 594
 595 int snd_pcm_plugin_append(struct snd_pcm_plugin *plugin)
 596 {
 597         struct snd_pcm_runtime *runtime = plugin->plug->runtime;
 598         plugin->next = NULL;
 599         plugin->prev = runtime->oss.plugin_last;
 600         if (runtime->oss.plugin_last) {
 601                 runtime->oss.plugin_last->next = plugin;
 602                 runtime->oss.plugin_last = plugin;
 603         } else {
 604                 runtime->oss.plugin_last =
 605                 runtime->oss.plugin_first = plugin;
 606         }
 607         return 0;
 608 }
 609 #endif /* CONFIG_SND_PCM_OSS_PLUGINS */
 610
 611 static long snd_pcm_oss_bytes(struct snd_pcm_substream *substream, long frames)
 612 {
 613         struct snd_pcm_runtime *runtime = substream->runtime;
 614         long buffer_size = snd_pcm_lib_buffer_bytes(substream);
 615         long bytes = frames_to_bytes(runtime, frames);
 616         if (buffer_size == runtime->oss.buffer_bytes)
 617                 return bytes;
 618 #if BITS_PER_LONG >= 64
 619         return runtime->oss.buffer_bytes * bytes / buffer_size;
 620 #else
 621         {
 622                 u64 bsize = (u64)runtime->oss.buffer_bytes * (u64)bytes;
 623                 return div_u64(bsize, buffer_size);
 624         }
 625 #endif
 626 }
 627
 628 static long snd_pcm_alsa_frames(struct snd_pcm_substream *substream, long bytes)
 629 {
 630         struct snd_pcm_runtime *runtime = substream->runtime;
 631         long buffer_size = snd_pcm_lib_buffer_bytes(substream);
 632         if (buffer_size == runtime->oss.buffer_bytes)
 633                 return bytes_to_frames(runtime, bytes);
 634         return bytes_to_frames(runtime, (buffer_size * bytes) / runtime->oss.buffer_bytes);
 635 }
 636
 637 static inline
 638 snd_pcm_uframes_t get_hw_ptr_period(struct snd_pcm_runtime *runtime)
 639 {
 640         return runtime->hw_ptr_interrupt;
 641 }
 642
 643 /* define extended formats in the recent OSS versions (if any) */
 644 /* linear formats */
 645 #define AFMT_S32_LE      0x00001000
 646 #define AFMT_S32_BE      0x00002000
 647 #define AFMT_S24_LE      0x00008000
 648 #define AFMT_S24_BE      0x00010000
 649 #define AFMT_S24_PACKED  0x00040000
 650
 651 /* other supported formats */
 652 #define AFMT_FLOAT       0x00004000
 653 #define AFMT_SPDIF_RAW   0x00020000
 654
 655 /* unsupported formats */
 656 #define AFMT_AC3         0x00000400
 657 #define AFMT_VORBIS      0x00000800
 658
 659 static snd_pcm_format_t snd_pcm_oss_format_from(int format)
 660 {
 661         switch (format) {
 662         case AFMT_MU_LAW:       return SNDRV_PCM_FORMAT_MU_LAW;
 663         case AFMT_A_LAW:        return SNDRV_PCM_FORMAT_A_LAW;
 664         case AFMT_IMA_ADPCM:    return SNDRV_PCM_FORMAT_IMA_ADPCM;
 665         case AFMT_U8:           return SNDRV_PCM_FORMAT_U8;
 666         case AFMT_S16_LE:       return SNDRV_PCM_FORMAT_S16_LE;
 667         case AFMT_S16_BE:       return SNDRV_PCM_FORMAT_S16_BE;
 668         case AFMT_S8:           return SNDRV_PCM_FORMAT_S8;
 669         case AFMT_U16_LE:       return SNDRV_PCM_FORMAT_U16_LE;
 670         case AFMT_U16_BE:       return SNDRV_PCM_FORMAT_U16_BE;
 671         case AFMT_MPEG:         return SNDRV_PCM_FORMAT_MPEG;
 672         case AFMT_S32_LE:       return SNDRV_PCM_FORMAT_S32_LE;
 673         case AFMT_S32_BE:       return SNDRV_PCM_FORMAT_S32_BE;
 674         case AFMT_S24_LE:       return SNDRV_PCM_FORMAT_S24_LE;
 675         case AFMT_S24_BE:       return SNDRV_PCM_FORMAT_S24_BE;
 676         case AFMT_S24_PACKED:   return SNDRV_PCM_FORMAT_S24_3LE;
 677         case AFMT_FLOAT:        return SNDRV_PCM_FORMAT_FLOAT;
 678         case AFMT_SPDIF_RAW:    return SNDRV_PCM_FORMAT_IEC958_SUBFRAME;
 679         default:                return SNDRV_PCM_FORMAT_U8;
 680         }
 681 }
 682
 683 static int snd_pcm_oss_format_to(snd_pcm_format_t format)
 684 {
 685         switch (format) {
 686         case SNDRV_PCM_FORMAT_MU_LAW:   return AFMT_MU_LAW;
 687         case SNDRV_PCM_FORMAT_A_LAW:    return AFMT_A_LAW;
 688         case SNDRV_PCM_FORMAT_IMA_ADPCM:        return AFMT_IMA_ADPCM;
 689         case SNDRV_PCM_FORMAT_U8:               return AFMT_U8;
 690         case SNDRV_PCM_FORMAT_S16_LE:   return AFMT_S16_LE;
 691         case SNDRV_PCM_FORMAT_S16_BE:   return AFMT_S16_BE;
 692         case SNDRV_PCM_FORMAT_S8:               return AFMT_S8;
 693         case SNDRV_PCM_FORMAT_U16_LE:   return AFMT_U16_LE;
 694         case SNDRV_PCM_FORMAT_U16_BE:   return AFMT_U16_BE;
 695         case SNDRV_PCM_FORMAT_MPEG:             return AFMT_MPEG;
 696         case SNDRV_PCM_FORMAT_S32_LE:   return AFMT_S32_LE;
 697         case SNDRV_PCM_FORMAT_S32_BE:   return AFMT_S32_BE;
 698         case SNDRV_PCM_FORMAT_S24_LE:   return AFMT_S24_LE;
 699         case SNDRV_PCM_FORMAT_S24_BE:   return AFMT_S24_BE;
 700         case SNDRV_PCM_FORMAT_S24_3LE:  return AFMT_S24_PACKED;
 701         case SNDRV_PCM_FORMAT_FLOAT:    return AFMT_FLOAT;
 702         case SNDRV_PCM_FORMAT_IEC958_SUBFRAME: return AFMT_SPDIF_RAW;
 703         default:                        return -EINVAL;
 704         }
 705 }
 706
 707 static int snd_pcm_oss_period_size(struct snd_pcm_substream *substream,
 708                                    struct snd_pcm_hw_params *oss_params,
 709                                    struct snd_pcm_hw_params *slave_params)
 710 {
 711         size_t s;
 712         size_t oss_buffer_size, oss_period_size, oss_periods;
 713         size_t min_period_size, max_period_size;
 714         struct snd_pcm_runtime *runtime = substream->runtime;
 715         size_t oss_frame_size;
 716
 717         oss_frame_size = snd_pcm_format_physical_width(params_format(oss_params)) *
 718                          params_channels(oss_params) / 8;
 719
 720         oss_buffer_size = snd_pcm_plug_client_size(substream,
 721                                                    snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, NULL)) * oss_frame_size;
 722         oss_buffer_size = rounddown_pow_of_two(oss_buffer_size);
 723         if (atomic_read(&substream->mmap_count)) {
 724                 if (oss_buffer_size > runtime->oss.mmap_bytes)
 725                         oss_buffer_size = runtime->oss.mmap_bytes;
 726         }
 727
 728         if (substream->oss.setup.period_size > 16)
 729                 oss_period_size = substream->oss.setup.period_size;
 730         else if (runtime->oss.fragshift) {
 731                 oss_period_size = 1 << runtime->oss.fragshift;
 732                 if (oss_period_size > oss_buffer_size / 2)
 733                         oss_period_size = oss_buffer_size / 2;
 734         } else {
 735                 int sd;
 736                 size_t bytes_per_sec = params_rate(oss_params) * snd_pcm_format_physical_width(params_format(oss_params)) * params_channels(oss_params) / 8;
 737
 738                 oss_period_size = oss_buffer_size;
 739                 do {
 740                         oss_period_size /= 2;
 741                 } while (oss_period_size > bytes_per_sec);
 742                 if (runtime->oss.subdivision == 0) {
 743                         sd = 4;
 744                         if (oss_period_size / sd > 4096)
 745                                 sd *= 2;
 746                         if (oss_period_size / sd < 4096)
 747                                 sd = 1;
 748                 } else
 749                         sd = runtime->oss.subdivision;
 750                 oss_period_size /= sd;
 751                 if (oss_period_size < 16)
 752                         oss_period_size = 16;
 753         }
 754
 755         min_period_size = snd_pcm_plug_client_size(substream,
 756                                                    snd_pcm_hw_param_value_min(slave_params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, NULL));
 757         min_period_size *= oss_frame_size;
 758         min_period_size = roundup_pow_of_two(min_period_size);
 759         if (oss_period_size < min_period_size)
 760                 oss_period_size = min_period_size;
 761
 762         max_period_size = snd_pcm_plug_client_size(substream,
 763                                                    snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, NULL));
 764         max_period_size *= oss_frame_size;
 765         max_period_size = rounddown_pow_of_two(max_period_size);
 766         if (oss_period_size > max_period_size)
 767                 oss_period_size = max_period_size;
 768
 769         oss_periods = oss_buffer_size / oss_period_size;
 770
 771         if (substream->oss.setup.periods > 1)
 772                 oss_periods = substream->oss.setup.periods;
 773
 774         s = snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_PERIODS, NULL);
 775         if (runtime->oss.maxfrags && s > runtime->oss.maxfrags)
 776                 s = runtime->oss.maxfrags;
 777         if (oss_periods > s)
 778                 oss_periods = s;
 779
 780         s = snd_pcm_hw_param_value_min(slave_params, SNDRV_PCM_HW_PARAM_PERIODS, NULL);
 781         if (s < 2)
 782                 s = 2;
 783         if (oss_periods < s)
 784                 oss_periods = s;
 785
 786         while (oss_period_size * oss_periods > oss_buffer_size)
 787                 oss_period_size /= 2;
 788
 789         if (oss_period_size < 16)
 790                 return -EINVAL;
 791         runtime->oss.period_bytes = oss_period_size;
 792         runtime->oss.period_frames = 1;
 793         runtime->oss.periods = oss_periods;
 794         return 0;
 795 }
 796
 797 static int choose_rate(struct snd_pcm_substream *substream,
 798                        struct snd_pcm_hw_params *params, unsigned int best_rate)
 799 {
 800         struct snd_interval *it;
 801         struct snd_pcm_hw_params *save;
 802         unsigned int rate, prev;
 803
 804         save = kmalloc(sizeof(*save), GFP_KERNEL);
 805         if (save == NULL)
 806                 return -ENOMEM;
 807         *save = *params;
 808         it = hw_param_interval(save, SNDRV_PCM_HW_PARAM_RATE);
 809
 810         /* try multiples of the best rate */
 811         rate = best_rate;
 812         for (;;) {
 813                 if (it->max < rate || (it->max == rate && it->openmax))
 814                         break;
 815                 if (it->min < rate || (it->min == rate && !it->openmin)) {
 816                         int ret;
 817                         ret = snd_pcm_hw_param_set(substream, params,
 818                                                    SNDRV_PCM_HW_PARAM_RATE,
 819                                                    rate, 0);
 820                         if (ret == (int)rate) {
 821                                 kfree(save);
 822                                 return rate;
 823                         }
 824                         *params = *save;
 825                 }
 826                 prev = rate;
 827                 rate += best_rate;
 828                 if (rate <= prev)
 829                         break;
 830         }
 831
 832         /* not found, use the nearest rate */
 833         kfree(save);
 834         return snd_pcm_hw_param_near(substream, params, SNDRV_PCM_HW_PARAM_RATE, best_rate, NULL);
 835 }
 836
 837 /* parameter locking: returns immediately if tried during streaming */
 838 static int lock_params(struct snd_pcm_runtime *runtime)
 839 {
 840         if (mutex_lock_interruptible(&runtime->oss.params_lock))
 841                 return -ERESTARTSYS;
 842         if (atomic_read(&runtime->oss.rw_ref)) {
 843                 mutex_unlock(&runtime->oss.params_lock);
 844                 return -EBUSY;
 845         }
 846         return 0;
 847 }
 848
 849 static void unlock_params(struct snd_pcm_runtime *runtime)
 850 {
 851         mutex_unlock(&runtime->oss.params_lock);
 852 }
 853
 854 /* call with params_lock held */
 855 static int snd_pcm_oss_change_params_locked(struct snd_pcm_substream *substream)
 856 {
 857         struct snd_pcm_runtime *runtime = substream->runtime;
 858         struct snd_pcm_hw_params *params, *sparams;
 859         struct snd_pcm_sw_params *sw_params;
 860         ssize_t oss_buffer_size, oss_period_size;
 861         size_t oss_frame_size;
 862         int err;
 863         int direct;
 864         snd_pcm_format_t format, sformat;
 865         int n;
 866         struct snd_mask sformat_mask;
 867         struct snd_mask mask;
 868
 869         if (!runtime->oss.params)
 870                 return 0;
 871         sw_params = kzalloc(sizeof(*sw_params), GFP_KERNEL);
 872         params = kmalloc(sizeof(*params), GFP_KERNEL);
 873         sparams = kmalloc(sizeof(*sparams), GFP_KERNEL);
 874         if (!sw_params || !params || !sparams) {
 875                 err = -ENOMEM;
 876                 goto failure;
 877         }
 878
 879         if (atomic_read(&substream->mmap_count))
 880                 direct = 1;
 881         else
 882                 direct = substream->oss.setup.direct;
 883
 884         _snd_pcm_hw_params_any(sparams);
 885         _snd_pcm_hw_param_setinteger(sparams, SNDRV_PCM_HW_PARAM_PERIODS);
 886         _snd_pcm_hw_param_min(sparams, SNDRV_PCM_HW_PARAM_PERIODS, 2, 0);
 887         snd_mask_none(&mask);
 888         if (atomic_read(&substream->mmap_count))
 889                 snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_MMAP_INTERLEAVED);
 890         else {
 891                 snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED);
 892                 if (!direct)
 893                         snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
 894         }
 895         err = snd_pcm_hw_param_mask(substream, sparams, SNDRV_PCM_HW_PARAM_ACCESS, &mask);
 896         if (err < 0) {
 897                 pcm_dbg(substream->pcm, "No usable accesses\n");
 898                 err = -EINVAL;
 899                 goto failure;
 900         }
 901         choose_rate(substream, sparams, runtime->oss.rate);
 902         snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_CHANNELS, runtime->oss.channels, NULL);
 903
 904         format = snd_pcm_oss_format_from(runtime->oss.format);
 905
 906         sformat_mask = *hw_param_mask(sparams, SNDRV_PCM_HW_PARAM_FORMAT);
 907         if (direct)
 908                 sformat = format;
 909         else
 910                 sformat = snd_pcm_plug_slave_format(format, &sformat_mask);
 911
 912         if ((__force int)sformat < 0 ||
 913             !snd_mask_test(&sformat_mask, (__force int)sformat)) {
 914                 for (sformat = (__force snd_pcm_format_t)0;
 915                      (__force int)sformat <= (__force int)SNDRV_PCM_FORMAT_LAST;
 916                      sformat = (__force snd_pcm_format_t)((__force int)sformat + 1)) {
 917                         if (snd_mask_test(&sformat_mask, (__force int)sformat) &&
 918                             snd_pcm_oss_format_to(sformat) >= 0)
 919                                 break;
 920                 }
 921                 if ((__force int)sformat > (__force int)SNDRV_PCM_FORMAT_LAST) {
 922                         pcm_dbg(substream->pcm, "Cannot find a format!!!\n");
 923                         err = -EINVAL;
 924                         goto failure;
 925                 }
 926         }
 927         err = _snd_pcm_hw_param_set(sparams, SNDRV_PCM_HW_PARAM_FORMAT, (__force int)sformat, 0);
 928         if (err < 0)
 929                 goto failure;
 930
 931         if (direct) {
 932                 memcpy(params, sparams, sizeof(*params));
 933         } else {
 934                 _snd_pcm_hw_params_any(params);
 935                 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_ACCESS,
 936                                       (__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED, 0);
 937                 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_FORMAT,
 938                                       (__force int)snd_pcm_oss_format_from(runtime->oss.format), 0);
 939                 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_CHANNELS,
 940                                       runtime->oss.channels, 0);
 941                 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_RATE,
 942                                       runtime->oss.rate, 0);
 943                 pdprintf("client: access = %i, format = %i, channels = %i, rate = %i\n",
 944                          params_access(params), params_format(params),
 945                          params_channels(params), params_rate(params));
 946         }
 947         pdprintf("slave: access = %i, format = %i, channels = %i, rate = %i\n",
 948                  params_access(sparams), params_format(sparams),
 949                  params_channels(sparams), params_rate(sparams));
 950
 951         oss_frame_size = snd_pcm_format_physical_width(params_format(params)) *
 952                          params_channels(params) / 8;
 953
 954 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
 955         snd_pcm_oss_plugin_clear(substream);
 956         if (!direct) {
 957                 /* add necessary plugins */
 958                 snd_pcm_oss_plugin_clear(substream);
 959                 if ((err = snd_pcm_plug_format_plugins(substream,
 960                                                        params,
 961                                                        sparams)) < 0) {
 962                         pcm_dbg(substream->pcm,
 963                                 "snd_pcm_plug_format_plugins failed: %i\n", err);
 964                         snd_pcm_oss_plugin_clear(substream);
 965                         goto failure;
 966                 }
 967                 if (runtime->oss.plugin_first) {
 968                         struct snd_pcm_plugin *plugin;
 969                         if ((err = snd_pcm_plugin_build_io(substream, sparams, &plugin)) < 0) {
 970                                 pcm_dbg(substream->pcm,
 971                                         "snd_pcm_plugin_build_io failed: %i\n", err);
 972                                 snd_pcm_oss_plugin_clear(substream);
 973                                 goto failure;
 974                         }
 975                         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 976                                 err = snd_pcm_plugin_append(plugin);
 977                         } else {
 978                                 err = snd_pcm_plugin_insert(plugin);
 979                         }
 980                         if (err < 0) {
 981                                 snd_pcm_oss_plugin_clear(substream);
 982                                 goto failure;
 983                         }
 984                 }
 985         }
 986 #endif
 987
 988         err = snd_pcm_oss_period_size(substream, params, sparams);
 989         if (err < 0)
 990                 goto failure;
 991
 992         n = snd_pcm_plug_slave_size(substream, runtime->oss.period_bytes / oss_frame_size);
 993         err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, n, NULL);
 994         if (err < 0)
 995                 goto failure;
 996
 997         err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIODS,
 998                                      runtime->oss.periods, NULL);
 999         if (err < 0)
1000                 goto failure;
1001
1002         snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1003
1004         if ((err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_HW_PARAMS, sparams)) < 0) {
1005                 pcm_dbg(substream->pcm, "HW_PARAMS failed: %i\n", err);
1006                 goto failure;
1007         }
1008
1009         if (runtime->oss.trigger) {
1010                 sw_params->start_threshold = 1;
1011         } else {
1012                 sw_params->start_threshold = runtime->boundary;
1013         }
1014         if (atomic_read(&substream->mmap_count) ||
1015             substream->stream == SNDRV_PCM_STREAM_CAPTURE)
1016                 sw_params->stop_threshold = runtime->boundary;
1017         else
1018                 sw_params->stop_threshold = runtime->buffer_size;
1019         sw_params->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
1020         sw_params->period_step = 1;
1021         sw_params->avail_min = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
1022                 1 : runtime->period_size;
1023         if (atomic_read(&substream->mmap_count) ||
1024             substream->oss.setup.nosilence) {
1025                 sw_params->silence_threshold = 0;
1026                 sw_params->silence_size = 0;
1027         } else {
1028                 snd_pcm_uframes_t frames;
1029                 frames = runtime->period_size + 16;
1030                 if (frames > runtime->buffer_size)
1031                         frames = runtime->buffer_size;
1032                 sw_params->silence_threshold = frames;
1033                 sw_params->silence_size = frames;
1034         }
1035
1036         if ((err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_SW_PARAMS, sw_params)) < 0) {
1037                 pcm_dbg(substream->pcm, "SW_PARAMS failed: %i\n", err);
1038                 goto failure;
1039         }
1040
1041         runtime->oss.periods = params_periods(sparams);
1042         oss_period_size = snd_pcm_plug_client_size(substream, params_period_size(sparams));
1043         if (oss_period_size < 0) {
1044                 err = -EINVAL;
1045                 goto failure;
1046         }
1047 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1048         if (runtime->oss.plugin_first) {
1049                 err = snd_pcm_plug_alloc(substream, oss_period_size);
1050                 if (err < 0)
1051                         goto failure;
1052         }
1053 #endif
1054         oss_period_size *= oss_frame_size;
1055
1056         oss_buffer_size = oss_period_size * runtime->oss.periods;
1057         if (oss_buffer_size < 0) {
1058                 err = -EINVAL;
1059                 goto failure;
1060         }
1061
1062         runtime->oss.period_bytes = oss_period_size;
1063         runtime->oss.buffer_bytes = oss_buffer_size;
1064
1065         pdprintf("oss: period bytes = %i, buffer bytes = %i\n",
1066                  runtime->oss.period_bytes,
1067                  runtime->oss.buffer_bytes);
1068         pdprintf("slave: period_size = %i, buffer_size = %i\n",
1069                  params_period_size(sparams),
1070                  params_buffer_size(sparams));
1071
1072         runtime->oss.format = snd_pcm_oss_format_to(params_format(params));
1073         runtime->oss.channels = params_channels(params);
1074         runtime->oss.rate = params_rate(params);
1075
1076         vfree(runtime->oss.buffer);
1077         runtime->oss.buffer = vmalloc(runtime->oss.period_bytes);
1078         if (!runtime->oss.buffer) {
1079                 err = -ENOMEM;
1080                 goto failure;
1081         }
1082
1083         runtime->oss.params = 0;
1084         runtime->oss.prepare = 1;
1085         runtime->oss.buffer_used = 0;
1086         if (runtime->dma_area)
1087                 snd_pcm_format_set_silence(runtime->format, runtime->dma_area, bytes_to_samples(runtime, runtime->dma_bytes));
1088
1089         runtime->oss.period_frames = snd_pcm_alsa_frames(substream, oss_period_size);
1090
1091         err = 0;
1092 failure:
1093         kfree(sw_params);
1094         kfree(params);
1095         kfree(sparams);
1096         return err;
1097 }
1098
1099 /* this one takes the lock by itself */
1100 static int snd_pcm_oss_change_params(struct snd_pcm_substream *substream,
1101                                      bool trylock)
1102 {
1103         struct snd_pcm_runtime *runtime = substream->runtime;
1104         int err;
1105
1106         if (trylock) {
1107                 if (!(mutex_trylock(&runtime->oss.params_lock)))
1108                         return -EAGAIN;
1109         } else if (mutex_lock_interruptible(&runtime->oss.params_lock))
1110                 return -ERESTARTSYS;
1111
1112         err = snd_pcm_oss_change_params_locked(substream);
1113         mutex_unlock(&runtime->oss.params_lock);
1114         return err;
1115 }
1116
1117 static int snd_pcm_oss_get_active_substream(struct snd_pcm_oss_file *pcm_oss_file, struct snd_pcm_substream **r_substream)
1118 {
1119         int idx, err;
1120         struct snd_pcm_substream *asubstream = NULL, *substream;
1121
1122         for (idx = 0; idx < 2; idx++) {
1123                 substream = pcm_oss_file->streams[idx];
1124                 if (substream == NULL)
1125                         continue;
1126                 if (asubstream == NULL)
1127                         asubstream = substream;
1128                 if (substream->runtime->oss.params) {
1129                         err = snd_pcm_oss_change_params(substream, false);
1130                         if (err < 0)
1131                                 return err;
1132                 }
1133         }
1134         if (!asubstream)
1135                 return -EIO;
1136         if (r_substream)
1137                 *r_substream = asubstream;
1138         return 0;
1139 }
1140
1141 /* call with params_lock held */
1142 /* NOTE: this always call PREPARE unconditionally no matter whether
1143  * runtime->oss.prepare is set or not
1144  */
1145 static int snd_pcm_oss_prepare(struct snd_pcm_substream *substream)
1146 {
1147         int err;
1148         struct snd_pcm_runtime *runtime = substream->runtime;
1149
1150         err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_PREPARE, NULL);
1151         if (err < 0) {
1152                 pcm_dbg(substream->pcm,
1153                         "snd_pcm_oss_prepare: SNDRV_PCM_IOCTL_PREPARE failed\n");
1154                 return err;
1155         }
1156         runtime->oss.prepare = 0;
1157         runtime->oss.prev_hw_ptr_period = 0;
1158         runtime->oss.period_ptr = 0;
1159         runtime->oss.buffer_used = 0;
1160
1161         return 0;
1162 }
1163
1164 static int snd_pcm_oss_make_ready(struct snd_pcm_substream *substream)
1165 {
1166         struct snd_pcm_runtime *runtime;
1167         int err;
1168
1169         runtime = substream->runtime;
1170         if (runtime->oss.params) {
1171                 err = snd_pcm_oss_change_params(substream, false);
1172                 if (err < 0)
1173                         return err;
1174         }
1175         if (runtime->oss.prepare) {
1176                 if (mutex_lock_interruptible(&runtime->oss.params_lock))
1177                         return -ERESTARTSYS;
1178                 err = snd_pcm_oss_prepare(substream);
1179                 mutex_unlock(&runtime->oss.params_lock);
1180                 if (err < 0)
1181                         return err;
1182         }
1183         return 0;
1184 }
1185
1186 /* call with params_lock held */
1187 static int snd_pcm_oss_make_ready_locked(struct snd_pcm_substream *substream)
1188 {
1189         struct snd_pcm_runtime *runtime;
1190         int err;
1191
1192         runtime = substream->runtime;
1193         if (runtime->oss.params) {
1194                 err = snd_pcm_oss_change_params_locked(substream);
1195                 if (err < 0)
1196                         return err;
1197         }
1198         if (runtime->oss.prepare) {
1199                 err = snd_pcm_oss_prepare(substream);
1200                 if (err < 0)
1201                         return err;
1202         }
1203         return 0;
1204 }
1205
1206 static int snd_pcm_oss_capture_position_fixup(struct snd_pcm_substream *substream, snd_pcm_sframes_t *delay)
1207 {
1208         struct snd_pcm_runtime *runtime;
1209         snd_pcm_uframes_t frames;
1210         int err = 0;
1211
1212         while (1) {
1213                 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, delay);
1214                 if (err < 0)
1215                         break;
1216                 runtime = substream->runtime;
1217                 if (*delay <= (snd_pcm_sframes_t)runtime->buffer_size)
1218                         break;
1219                 /* in case of overrun, skip whole periods like OSS/Linux driver does */
1220                 /* until avail(delay) <= buffer_size */
1221                 frames = (*delay - runtime->buffer_size) + runtime->period_size - 1;
1222                 frames /= runtime->period_size;
1223                 frames *= runtime->period_size;
1224                 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_FORWARD, &frames);
1225                 if (err < 0)
1226                         break;
1227         }
1228         return err;
1229 }
1230
1231 snd_pcm_sframes_t snd_pcm_oss_write3(struct snd_pcm_substream *substream, const char *ptr, snd_pcm_uframes_t frames, int in_kernel)
1232 {
1233         struct snd_pcm_runtime *runtime = substream->runtime;
1234         int ret;
1235         while (1) {
1236                 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1237                     runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1238 #ifdef OSS_DEBUG
1239                         pcm_dbg(substream->pcm,
1240                                 "pcm_oss: write: recovering from %s\n",
1241                                 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1242                                 "XRUN" : "SUSPEND");
1243 #endif
1244                         ret = snd_pcm_oss_prepare(substream);
1245                         if (ret < 0)
1246                                 break;
1247                 }
1248                 if (in_kernel) {
1249                         mm_segment_t fs;
1250                         fs = snd_enter_user();
1251                         ret = snd_pcm_lib_write(substream, (void __force __user *)ptr, frames);
1252                         snd_leave_user(fs);
1253                 } else {
1254                         ret = snd_pcm_lib_write(substream, (void __force __user *)ptr, frames);
1255                 }
1256                 if (ret != -EPIPE && ret != -ESTRPIPE)
1257                         break;
1258                 /* test, if we can't store new data, because the stream */
1259                 /* has not been started */
1260                 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED)
1261                         return -EAGAIN;
1262         }
1263         return ret;
1264 }
1265
1266 snd_pcm_sframes_t snd_pcm_oss_read3(struct snd_pcm_substream *substream, char *ptr, snd_pcm_uframes_t frames, int in_kernel)
1267 {
1268         struct snd_pcm_runtime *runtime = substream->runtime;
1269         snd_pcm_sframes_t delay;
1270         int ret;
1271         while (1) {
1272                 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1273                     runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1274 #ifdef OSS_DEBUG
1275                         pcm_dbg(substream->pcm,
1276                                 "pcm_oss: read: recovering from %s\n",
1277                                 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1278                                 "XRUN" : "SUSPEND");
1279 #endif
1280                         ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1281                         if (ret < 0)
1282                                 break;
1283                 } else if (runtime->status->state == SNDRV_PCM_STATE_SETUP) {
1284                         ret = snd_pcm_oss_prepare(substream);
1285                         if (ret < 0)
1286                                 break;
1287                 }
1288                 ret = snd_pcm_oss_capture_position_fixup(substream, &delay);
1289                 if (ret < 0)
1290                         break;
1291                 if (in_kernel) {
1292                         mm_segment_t fs;
1293                         fs = snd_enter_user();
1294                         ret = snd_pcm_lib_read(substream, (void __force __user *)ptr, frames);
1295                         snd_leave_user(fs);
1296                 } else {
1297                         ret = snd_pcm_lib_read(substream, (void __force __user *)ptr, frames);
1298                 }
1299                 if (ret == -EPIPE) {
1300                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1301                                 ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1302                                 if (ret < 0)
1303                                         break;
1304                         }
1305                         continue;
1306                 }
1307                 if (ret != -ESTRPIPE)
1308                         break;
1309         }
1310         return ret;
1311 }
1312
1313 snd_pcm_sframes_t snd_pcm_oss_writev3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames, int in_kernel)
1314 {
1315         struct snd_pcm_runtime *runtime = substream->runtime;
1316         int ret;
1317         while (1) {
1318                 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1319                     runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1320 #ifdef OSS_DEBUG
1321                         pcm_dbg(substream->pcm,
1322                                 "pcm_oss: writev: recovering from %s\n",
1323                                 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1324                                 "XRUN" : "SUSPEND");
1325 #endif
1326                         ret = snd_pcm_oss_prepare(substream);
1327                         if (ret < 0)
1328                                 break;
1329                 }
1330                 if (in_kernel) {
1331                         mm_segment_t fs;
1332                         fs = snd_enter_user();
1333                         ret = snd_pcm_lib_writev(substream, (void __user **)bufs, frames);
1334                         snd_leave_user(fs);
1335                 } else {
1336                         ret = snd_pcm_lib_writev(substream, (void __user **)bufs, frames);
1337                 }
1338                 if (ret != -EPIPE && ret != -ESTRPIPE)
1339                         break;
1340
1341                 /* test, if we can't store new data, because the stream */
1342                 /* has not been started */
1343                 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED)
1344                         return -EAGAIN;
1345         }
1346         return ret;
1347 }
1348
1349 snd_pcm_sframes_t snd_pcm_oss_readv3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames, int in_kernel)
1350 {
1351         struct snd_pcm_runtime *runtime = substream->runtime;
1352         int ret;
1353         while (1) {
1354                 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1355                     runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1356 #ifdef OSS_DEBUG
1357                         pcm_dbg(substream->pcm,
1358                                 "pcm_oss: readv: recovering from %s\n",
1359                                 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1360                                 "XRUN" : "SUSPEND");
1361 #endif
1362                         ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1363                         if (ret < 0)
1364                                 break;
1365                 } else if (runtime->status->state == SNDRV_PCM_STATE_SETUP) {
1366                         ret = snd_pcm_oss_prepare(substream);
1367                         if (ret < 0)
1368                                 break;
1369                 }
1370                 if (in_kernel) {
1371                         mm_segment_t fs;
1372                         fs = snd_enter_user();
1373                         ret = snd_pcm_lib_readv(substream, (void __user **)bufs, frames);
1374                         snd_leave_user(fs);
1375                 } else {
1376                         ret = snd_pcm_lib_readv(substream, (void __user **)bufs, frames);
1377                 }
1378                 if (ret != -EPIPE && ret != -ESTRPIPE)
1379                         break;
1380         }
1381         return ret;
1382 }
1383
1384 static ssize_t snd_pcm_oss_write2(struct snd_pcm_substream *substream, const char *buf, size_t bytes, int in_kernel)
1385 {
1386         struct snd_pcm_runtime *runtime = substream->runtime;
1387         snd_pcm_sframes_t frames, frames1;
1388 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1389         if (runtime->oss.plugin_first) {
1390                 struct snd_pcm_plugin_channel *channels;
1391                 size_t oss_frame_bytes = (runtime->oss.plugin_first->src_width * runtime->oss.plugin_first->src_format.channels) / 8;
1392                 if (!in_kernel) {
1393                         if (copy_from_user(runtime->oss.buffer, (const char __force __user *)buf, bytes))
1394                                 return -EFAULT;
1395                         buf = runtime->oss.buffer;
1396                 }
1397                 frames = bytes / oss_frame_bytes;
1398                 frames1 = snd_pcm_plug_client_channels_buf(substream, (char *)buf, frames, &channels);
1399                 if (frames1 < 0)
1400                         return frames1;
1401                 frames1 = snd_pcm_plug_write_transfer(substream, channels, frames1);
1402                 if (frames1 <= 0)
1403                         return frames1;
1404                 bytes = frames1 * oss_frame_bytes;
1405         } else
1406 #endif
1407         {
1408                 frames = bytes_to_frames(runtime, bytes);
1409                 frames1 = snd_pcm_oss_write3(substream, buf, frames, in_kernel);
1410                 if (frames1 <= 0)
1411                         return frames1;
1412                 bytes = frames_to_bytes(runtime, frames1);
1413         }
1414         return bytes;
1415 }
1416
1417 static ssize_t snd_pcm_oss_write1(struct snd_pcm_substream *substream, const char __user *buf, size_t bytes)
1418 {
1419         size_t xfer = 0;
1420         ssize_t tmp = 0;
1421         struct snd_pcm_runtime *runtime = substream->runtime;
1422
1423         if (atomic_read(&substream->mmap_count))
1424                 return -ENXIO;
1425
1426         atomic_inc(&runtime->oss.rw_ref);
1427         while (bytes > 0) {
1428                 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1429                         tmp = -ERESTARTSYS;
1430                         break;
1431                 }
1432                 tmp = snd_pcm_oss_make_ready_locked(substream);
1433                 if (tmp < 0)
1434                         goto err;
1435                 if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
1436                         tmp = bytes;
1437                         if (tmp + runtime->oss.buffer_used > runtime->oss.period_bytes)
1438                                 tmp = runtime->oss.period_bytes - runtime->oss.buffer_used;
1439                         if (tmp > 0) {
1440                                 if (copy_from_user(runtime->oss.buffer + runtime->oss.buffer_used, buf, tmp)) {
1441                                         tmp = -EFAULT;
1442                                         goto err;
1443                                 }
1444                         }
1445                         runtime->oss.buffer_used += tmp;
1446                         buf += tmp;
1447                         bytes -= tmp;
1448                         xfer += tmp;
1449                         if (substream->oss.setup.partialfrag ||
1450                             runtime->oss.buffer_used == runtime->oss.period_bytes) {
1451                                 tmp = snd_pcm_oss_write2(substream, runtime->oss.buffer + runtime->oss.period_ptr,
1452                                                          runtime->oss.buffer_used - runtime->oss.period_ptr, 1);
1453                                 if (tmp <= 0)
1454                                         goto err;
1455                                 runtime->oss.bytes += tmp;
1456                                 runtime->oss.period_ptr += tmp;
1457                                 runtime->oss.period_ptr %= runtime->oss.period_bytes;
1458                                 if (runtime->oss.period_ptr == 0 ||
1459                                     runtime->oss.period_ptr == runtime->oss.buffer_used)
1460                                         runtime->oss.buffer_used = 0;
1461                                 else if ((substream->f_flags & O_NONBLOCK) != 0) {
1462                                         tmp = -EAGAIN;
1463                                         goto err;
1464                                 }
1465                         }
1466                 } else {
1467                         tmp = snd_pcm_oss_write2(substream,
1468                                                  (const char __force *)buf,
1469                                                  runtime->oss.period_bytes, 0);
1470                         if (tmp <= 0)
1471                                 goto err;
1472                         runtime->oss.bytes += tmp;
1473                         buf += tmp;
1474                         bytes -= tmp;
1475                         xfer += tmp;
1476                         if ((substream->f_flags & O_NONBLOCK) != 0 &&
1477                             tmp != runtime->oss.period_bytes)
1478                                 tmp = -EAGAIN;
1479                 }
1480  err:
1481                 mutex_unlock(&runtime->oss.params_lock);
1482                 if (tmp < 0)
1483                         break;
1484                 if (signal_pending(current)) {
1485                         tmp = -ERESTARTSYS;
1486                         break;
1487                 }
1488                 tmp = 0;
1489         }
1490         atomic_dec(&runtime->oss.rw_ref);
1491         return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
1492 }
1493
1494 static ssize_t snd_pcm_oss_read2(struct snd_pcm_substream *substream, char *buf, size_t bytes, int in_kernel)
1495 {
1496         struct snd_pcm_runtime *runtime = substream->runtime;
1497         snd_pcm_sframes_t frames, frames1;
1498 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1499         char __user *final_dst = (char __force __user *)buf;
1500         if (runtime->oss.plugin_first) {
1501                 struct snd_pcm_plugin_channel *channels;
1502                 size_t oss_frame_bytes = (runtime->oss.plugin_last->dst_width * runtime->oss.plugin_last->dst_format.channels) / 8;
1503                 if (!in_kernel)
1504                         buf = runtime->oss.buffer;
1505                 frames = bytes / oss_frame_bytes;
1506                 frames1 = snd_pcm_plug_client_channels_buf(substream, buf, frames, &channels);
1507                 if (frames1 < 0)
1508                         return frames1;
1509                 frames1 = snd_pcm_plug_read_transfer(substream, channels, frames1);
1510                 if (frames1 <= 0)
1511                         return frames1;
1512                 bytes = frames1 * oss_frame_bytes;
1513                 if (!in_kernel && copy_to_user(final_dst, buf, bytes))
1514                         return -EFAULT;
1515         } else
1516 #endif
1517         {
1518                 frames = bytes_to_frames(runtime, bytes);
1519                 frames1 = snd_pcm_oss_read3(substream, buf, frames, in_kernel);
1520                 if (frames1 <= 0)
1521                         return frames1;
1522                 bytes = frames_to_bytes(runtime, frames1);
1523         }
1524         return bytes;
1525 }
1526
1527 static ssize_t snd_pcm_oss_read1(struct snd_pcm_substream *substream, char __user *buf, size_t bytes)
1528 {
1529         size_t xfer = 0;
1530         ssize_t tmp = 0;
1531         struct snd_pcm_runtime *runtime = substream->runtime;
1532
1533         if (atomic_read(&substream->mmap_count))
1534                 return -ENXIO;
1535
1536         atomic_inc(&runtime->oss.rw_ref);
1537         while (bytes > 0) {
1538                 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1539                         tmp = -ERESTARTSYS;
1540                         break;
1541                 }
1542                 tmp = snd_pcm_oss_make_ready_locked(substream);
1543                 if (tmp < 0)
1544                         goto err;
1545                 if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
1546                         if (runtime->oss.buffer_used == 0) {
1547                                 tmp = snd_pcm_oss_read2(substream, runtime->oss.buffer, runtime->oss.period_bytes, 1);
1548                                 if (tmp <= 0)
1549                                         goto err;
1550                                 runtime->oss.bytes += tmp;
1551                                 runtime->oss.period_ptr = tmp;
1552                                 runtime->oss.buffer_used = tmp;
1553                         }
1554                         tmp = bytes;
1555                         if ((size_t) tmp > runtime->oss.buffer_used)
1556                                 tmp = runtime->oss.buffer_used;
1557                         if (copy_to_user(buf, runtime->oss.buffer + (runtime->oss.period_ptr - runtime->oss.buffer_used), tmp)) {
1558                                 tmp = -EFAULT;
1559                                 goto err;
1560                         }
1561                         buf += tmp;
1562                         bytes -= tmp;
1563                         xfer += tmp;
1564                         runtime->oss.buffer_used -= tmp;
1565                 } else {
1566                         tmp = snd_pcm_oss_read2(substream, (char __force *)buf,
1567                                                 runtime->oss.period_bytes, 0);
1568                         if (tmp <= 0)
1569                                 goto err;
1570                         runtime->oss.bytes += tmp;
1571                         buf += tmp;
1572                         bytes -= tmp;
1573                         xfer += tmp;
1574                 }
1575  err:
1576                 mutex_unlock(&runtime->oss.params_lock);
1577                 if (tmp < 0)
1578                         break;
1579                 if (signal_pending(current)) {
1580                         tmp = -ERESTARTSYS;
1581                         break;
1582                 }
1583                 tmp = 0;
1584         }
1585         atomic_dec(&runtime->oss.rw_ref);
1586         return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
1587 }
1588
1589 static int snd_pcm_oss_reset(struct snd_pcm_oss_file *pcm_oss_file)
1590 {
1591         struct snd_pcm_substream *substream;
1592         struct snd_pcm_runtime *runtime;
1593         int i;
1594
1595         for (i = 0; i < 2; i++) {
1596                 substream = pcm_oss_file->streams[i];
1597                 if (!substream)
1598                         continue;
1599                 runtime = substream->runtime;
1600                 snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1601                 mutex_lock(&runtime->oss.params_lock);
1602                 runtime->oss.prepare = 1;
1603                 runtime->oss.buffer_used = 0;
1604                 runtime->oss.prev_hw_ptr_period = 0;
1605                 runtime->oss.period_ptr = 0;
1606                 mutex_unlock(&runtime->oss.params_lock);
1607         }
1608         return 0;
1609 }
1610
1611 static int snd_pcm_oss_post(struct snd_pcm_oss_file *pcm_oss_file)
1612 {
1613         struct snd_pcm_substream *substream;
1614         int err;
1615
1616         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
1617         if (substream != NULL) {
1618                 if ((err = snd_pcm_oss_make_ready(substream)) < 0)
1619                         return err;
1620                 snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_START, NULL);
1621         }
1622         /* note: all errors from the start action are ignored */
1623         /* OSS apps do not know, how to handle them */
1624         return 0;
1625 }
1626
1627 static int snd_pcm_oss_sync1(struct snd_pcm_substream *substream, size_t size)
1628 {
1629         struct snd_pcm_runtime *runtime;
1630         ssize_t result = 0;
1631         snd_pcm_state_t state;
1632         long res;
1633         wait_queue_t wait;
1634
1635         runtime = substream->runtime;
1636         init_waitqueue_entry(&wait, current);
1637         add_wait_queue(&runtime->sleep, &wait);
1638 #ifdef OSS_DEBUG
1639         pcm_dbg(substream->pcm, "sync1: size = %li\n", size);
1640 #endif
1641         while (1) {
1642                 result = snd_pcm_oss_write2(substream, runtime->oss.buffer, size, 1);
1643                 if (result > 0) {
1644                         runtime->oss.buffer_used = 0;
1645                         result = 0;
1646                         break;
1647                 }
1648                 if (result != 0 && result != -EAGAIN)
1649                         break;
1650                 result = 0;
1651                 set_current_state(TASK_INTERRUPTIBLE);
1652                 snd_pcm_stream_lock_irq(substream);
1653                 state = runtime->status->state;
1654                 snd_pcm_stream_unlock_irq(substream);
1655                 if (state != SNDRV_PCM_STATE_RUNNING) {
1656                         set_current_state(TASK_RUNNING);
1657                         break;
1658                 }
1659                 res = schedule_timeout(10 * HZ);
1660                 if (signal_pending(current)) {
1661                         result = -ERESTARTSYS;
1662                         break;
1663                 }
1664                 if (res == 0) {
1665                         pcm_err(substream->pcm,
1666                                 "OSS sync error - DMA timeout\n");
1667                         result = -EIO;
1668                         break;
1669                 }
1670         }
1671         remove_wait_queue(&runtime->sleep, &wait);
1672         return result;
1673 }
1674
1675 static int snd_pcm_oss_sync(struct snd_pcm_oss_file *pcm_oss_file)
1676 {
1677         int err = 0;
1678         unsigned int saved_f_flags;
1679         struct snd_pcm_substream *substream;
1680         struct snd_pcm_runtime *runtime;
1681         snd_pcm_format_t format;
1682         unsigned long width;
1683         size_t size;
1684
1685         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
1686         if (substream != NULL) {
1687                 runtime = substream->runtime;
1688                 if (atomic_read(&substream->mmap_count))
1689                         goto __direct;
1690                 if ((err = snd_pcm_oss_make_ready(substream)) < 0)
1691                         return err;
1692                 atomic_inc(&runtime->oss.rw_ref);
1693                 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1694                         atomic_dec(&runtime->oss.rw_ref);
1695                         return -ERESTARTSYS;
1696                 }
1697                 format = snd_pcm_oss_format_from(runtime->oss.format);
1698                 width = snd_pcm_format_physical_width(format);
1699                 if (runtime->oss.buffer_used > 0) {
1700 #ifdef OSS_DEBUG
1701                         pcm_dbg(substream->pcm, "sync: buffer_used\n");
1702 #endif
1703                         size = (8 * (runtime->oss.period_bytes - runtime->oss.buffer_used) + 7) / width;
1704                         snd_pcm_format_set_silence(format,
1705                                                    runtime->oss.buffer + runtime->oss.buffer_used,
1706                                                    size);
1707                         err = snd_pcm_oss_sync1(substream, runtime->oss.period_bytes);
1708                         if (err < 0)
1709                                 goto unlock;
1710                 } else if (runtime->oss.period_ptr > 0) {
1711 #ifdef OSS_DEBUG
1712                         pcm_dbg(substream->pcm, "sync: period_ptr\n");
1713 #endif
1714                         size = runtime->oss.period_bytes - runtime->oss.period_ptr;
1715                         snd_pcm_format_set_silence(format,
1716                                                    runtime->oss.buffer,
1717                                                    size * 8 / width);
1718                         err = snd_pcm_oss_sync1(substream, size);
1719                         if (err < 0)
1720                                 goto unlock;
1721                 }
1722                 /*
1723                  * The ALSA's period might be a bit large than OSS one.
1724                  * Fill the remain portion of ALSA period with zeros.
1725                  */
1726                 size = runtime->control->appl_ptr % runtime->period_size;
1727                 if (size > 0) {
1728                         size = runtime->period_size - size;
1729                         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) {
1730                                 size = (runtime->frame_bits * size) / 8;
1731                                 while (size > 0) {
1732                                         mm_segment_t fs;
1733                                         size_t size1 = size < runtime->oss.period_bytes ? size : runtime->oss.period_bytes;
1734                                         size -= size1;
1735                                         size1 *= 8;
1736                                         size1 /= runtime->sample_bits;
1737                                         snd_pcm_format_set_silence(runtime->format,
1738                                                                    runtime->oss.buffer,
1739                                                                    size1);
1740                                         size1 /= runtime->channels; /* frames */
1741                                         fs = snd_enter_user();
1742                                         snd_pcm_lib_write(substream, (void __force __user *)runtime->oss.buffer, size1);
1743                                         snd_leave_user(fs);
1744                                 }
1745                         } else if (runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) {
1746                                 void __user *buffers[runtime->channels];
1747                                 memset(buffers, 0, runtime->channels * sizeof(void *));
1748                                 snd_pcm_lib_writev(substream, buffers, size);
1749                         }
1750                 }
1751 unlock:
1752                 mutex_unlock(&runtime->oss.params_lock);
1753                 atomic_dec(&runtime->oss.rw_ref);
1754                 if (err < 0)
1755                         return err;
1756                 /*
1757                  * finish sync: drain the buffer
1758                  */
1759               __direct:
1760                 saved_f_flags = substream->f_flags;
1761                 substream->f_flags &= ~O_NONBLOCK;
1762                 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1763                 substream->f_flags = saved_f_flags;
1764                 if (err < 0)
1765                         return err;
1766                 mutex_lock(&runtime->oss.params_lock);
1767                 runtime->oss.prepare = 1;
1768                 mutex_unlock(&runtime->oss.params_lock);
1769         }
1770
1771         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
1772         if (substream != NULL) {
1773                 if ((err = snd_pcm_oss_make_ready(substream)) < 0)
1774                         return err;
1775                 runtime = substream->runtime;
1776                 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1777                 if (err < 0)
1778                         return err;
1779                 mutex_lock(&runtime->oss.params_lock);
1780                 runtime->oss.buffer_used = 0;
1781                 runtime->oss.prepare = 1;
1782                 mutex_unlock(&runtime->oss.params_lock);
1783         }
1784         return 0;
1785 }
1786
1787 static int snd_pcm_oss_set_rate(struct snd_pcm_oss_file *pcm_oss_file, int rate)
1788 {
1789         int idx;
1790
1791         for (idx = 1; idx >= 0; --idx) {
1792                 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1793                 struct snd_pcm_runtime *runtime;
1794                 int err;
1795
1796                 if (substream == NULL)
1797                         continue;
1798                 runtime = substream->runtime;
1799                 if (rate < 1000)
1800                         rate = 1000;
1801                 else if (rate > 192000)
1802                         rate = 192000;
1803                 err = lock_params(runtime);
1804                 if (err < 0)
1805                         return err;
1806                 if (runtime->oss.rate != rate) {
1807                         runtime->oss.params = 1;
1808                         runtime->oss.rate = rate;
1809                 }
1810                 unlock_params(runtime);
1811         }
1812         return snd_pcm_oss_get_rate(pcm_oss_file);
1813 }
1814
1815 static int snd_pcm_oss_get_rate(struct snd_pcm_oss_file *pcm_oss_file)
1816 {
1817         struct snd_pcm_substream *substream;
1818         int err;
1819
1820         if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1821                 return err;
1822         return substream->runtime->oss.rate;
1823 }
1824
1825 static int snd_pcm_oss_set_channels(struct snd_pcm_oss_file *pcm_oss_file, unsigned int channels)
1826 {
1827         int idx;
1828         if (channels < 1)
1829                 channels = 1;
1830         if (channels > 128)
1831                 return -EINVAL;
1832         for (idx = 1; idx >= 0; --idx) {
1833                 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1834                 struct snd_pcm_runtime *runtime;
1835                 int err;
1836
1837                 if (substream == NULL)
1838                         continue;
1839                 runtime = substream->runtime;
1840                 err = lock_params(runtime);
1841                 if (err < 0)
1842                         return err;
1843                 if (runtime->oss.channels != channels) {
1844                         runtime->oss.params = 1;
1845                         runtime->oss.channels = channels;
1846                 }
1847                 unlock_params(runtime);
1848         }
1849         return snd_pcm_oss_get_channels(pcm_oss_file);
1850 }
1851
1852 static int snd_pcm_oss_get_channels(struct snd_pcm_oss_file *pcm_oss_file)
1853 {
1854         struct snd_pcm_substream *substream;
1855         int err;
1856
1857         if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1858                 return err;
1859         return substream->runtime->oss.channels;
1860 }
1861
1862 static int snd_pcm_oss_get_block_size(struct snd_pcm_oss_file *pcm_oss_file)
1863 {
1864         struct snd_pcm_substream *substream;
1865         int err;
1866
1867         if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1868                 return err;
1869         return substream->runtime->oss.period_bytes;
1870 }
1871
1872 static int snd_pcm_oss_get_formats(struct snd_pcm_oss_file *pcm_oss_file)
1873 {
1874         struct snd_pcm_substream *substream;
1875         int err;
1876         int direct;
1877         struct snd_pcm_hw_params *params;
1878         unsigned int formats = 0;
1879         struct snd_mask format_mask;
1880         int fmt;
1881
1882         if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1883                 return err;
1884         if (atomic_read(&substream->mmap_count))
1885                 direct = 1;
1886         else
1887                 direct = substream->oss.setup.direct;
1888         if (!direct)
1889                 return AFMT_MU_LAW | AFMT_U8 |
1890                        AFMT_S16_LE | AFMT_S16_BE |
1891                        AFMT_S8 | AFMT_U16_LE |
1892                        AFMT_U16_BE |
1893                         AFMT_S32_LE | AFMT_S32_BE |
1894                         AFMT_S24_LE | AFMT_S24_BE |
1895                         AFMT_S24_PACKED;
1896         params = kmalloc(sizeof(*params), GFP_KERNEL);
1897         if (!params)
1898                 return -ENOMEM;
1899         _snd_pcm_hw_params_any(params);
1900         err = snd_pcm_hw_refine(substream, params);
1901         if (err < 0)
1902                 goto error;
1903         format_mask = *hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1904         for (fmt = 0; fmt < 32; ++fmt) {
1905                 if (snd_mask_test(&format_mask, fmt)) {
1906                         int f = snd_pcm_oss_format_to(fmt);
1907                         if (f >= 0)
1908                                 formats |= f;
1909                 }
1910         }
1911
1912  error:
1913         kfree(params);
1914         return err < 0 ? err : formats;
1915 }
1916
1917 static int snd_pcm_oss_set_format(struct snd_pcm_oss_file *pcm_oss_file, int format)
1918 {
1919         int formats, idx;
1920         int err;
1921
1922         if (format != AFMT_QUERY) {
1923                 formats = snd_pcm_oss_get_formats(pcm_oss_file);
1924                 if (formats < 0)
1925                         return formats;
1926                 if (!(formats & format))
1927                         format = AFMT_U8;
1928                 for (idx = 1; idx >= 0; --idx) {
1929                         struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1930                         struct snd_pcm_runtime *runtime;
1931                         if (substream == NULL)
1932                                 continue;
1933                         runtime = substream->runtime;
1934                         err = lock_params(runtime);
1935                         if (err < 0)
1936                                 return err;
1937                         if (runtime->oss.format != format) {
1938                                 runtime->oss.params = 1;
1939                                 runtime->oss.format = format;
1940                         }
1941                         unlock_params(runtime);
1942                 }
1943         }
1944         return snd_pcm_oss_get_format(pcm_oss_file);
1945 }
1946
1947 static int snd_pcm_oss_get_format(struct snd_pcm_oss_file *pcm_oss_file)
1948 {
1949         struct snd_pcm_substream *substream;
1950         int err;
1951
1952         if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1953                 return err;
1954         return substream->runtime->oss.format;
1955 }
1956
1957 static int snd_pcm_oss_set_subdivide1(struct snd_pcm_substream *substream, int subdivide)
1958 {
1959         struct snd_pcm_runtime *runtime;
1960
1961         runtime = substream->runtime;
1962         if (subdivide == 0) {
1963                 subdivide = runtime->oss.subdivision;
1964                 if (subdivide == 0)
1965                         subdivide = 1;
1966                 return subdivide;
1967         }
1968         if (runtime->oss.subdivision || runtime->oss.fragshift)
1969                 return -EINVAL;
1970         if (subdivide != 1 && subdivide != 2 && subdivide != 4 &&
1971             subdivide != 8 && subdivide != 16)
1972                 return -EINVAL;
1973         runtime->oss.subdivision = subdivide;
1974         runtime->oss.params = 1;
1975         return subdivide;
1976 }
1977
1978 static int snd_pcm_oss_set_subdivide(struct snd_pcm_oss_file *pcm_oss_file, int subdivide)
1979 {
1980         int err = -EINVAL, idx;
1981
1982         for (idx = 1; idx >= 0; --idx) {
1983                 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1984                 struct snd_pcm_runtime *runtime;
1985
1986                 if (substream == NULL)
1987                         continue;
1988                 runtime = substream->runtime;
1989                 err = lock_params(runtime);
1990                 if (err < 0)
1991                         return err;
1992                 err = snd_pcm_oss_set_subdivide1(substream, subdivide);
1993                 unlock_params(runtime);
1994                 if (err < 0)
1995                         return err;
1996         }
1997         return err;
1998 }
1999
2000 static int snd_pcm_oss_set_fragment1(struct snd_pcm_substream *substream, unsigned int val)
2001 {
2002         struct snd_pcm_runtime *runtime;
2003
2004         runtime = substream->runtime;
2005         if (runtime->oss.subdivision || runtime->oss.fragshift)
2006                 return -EINVAL;
2007         runtime->oss.fragshift = val & 0xffff;
2008         runtime->oss.maxfrags = (val >> 16) & 0xffff;
2009         if (runtime->oss.fragshift < 4)         /* < 16 */
2010                 runtime->oss.fragshift = 4;
2011         if (runtime->oss.maxfrags < 2)
2012                 runtime->oss.maxfrags = 2;
2013         runtime->oss.params = 1;
2014         return 0;
2015 }
2016
2017 static int snd_pcm_oss_set_fragment(struct snd_pcm_oss_file *pcm_oss_file, unsigned int val)
2018 {
2019         int err = -EINVAL, idx;
2020
2021         for (idx = 1; idx >= 0; --idx) {
2022                 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
2023                 struct snd_pcm_runtime *runtime;
2024
2025                 if (substream == NULL)
2026                         continue;
2027                 runtime = substream->runtime;
2028                 err = lock_params(runtime);
2029                 if (err < 0)
2030                         return err;
2031                 err = snd_pcm_oss_set_fragment1(substream, val);
2032                 unlock_params(runtime);
2033                 if (err < 0)
2034                         return err;
2035         }
2036         return err;
2037 }
2038
2039 static int snd_pcm_oss_nonblock(struct file * file)
2040 {
2041         spin_lock(&file->f_lock);
2042         file->f_flags |= O_NONBLOCK;
2043         spin_unlock(&file->f_lock);
2044         return 0;
2045 }
2046
2047 static int snd_pcm_oss_get_caps1(struct snd_pcm_substream *substream, int res)
2048 {
2049
2050         if (substream == NULL) {
2051                 res &= ~DSP_CAP_DUPLEX;
2052                 return res;
2053         }
2054 #ifdef DSP_CAP_MULTI
2055         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2056                 if (substream->pstr->substream_count > 1)
2057                         res |= DSP_CAP_MULTI;
2058 #endif
2059         /* DSP_CAP_REALTIME is set all times: */
2060         /* all ALSA drivers can return actual pointer in ring buffer */
2061 #if defined(DSP_CAP_REALTIME) && 0
2062         {
2063                 struct snd_pcm_runtime *runtime = substream->runtime;
2064                 if (runtime->info & (SNDRV_PCM_INFO_BLOCK_TRANSFER|SNDRV_PCM_INFO_BATCH))
2065                         res &= ~DSP_CAP_REALTIME;
2066         }
2067 #endif
2068         return res;
2069 }
2070
2071 static int snd_pcm_oss_get_caps(struct snd_pcm_oss_file *pcm_oss_file)
2072 {
2073         int result, idx;
2074
2075         result = DSP_CAP_TRIGGER | DSP_CAP_MMAP | DSP_CAP_DUPLEX | DSP_CAP_REALTIME;
2076         for (idx = 0; idx < 2; idx++) {
2077                 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
2078                 result = snd_pcm_oss_get_caps1(substream, result);
2079         }
2080         result |= 0x0001;       /* revision - same as SB AWE 64 */
2081         return result;
2082 }
2083
2084 static void snd_pcm_oss_simulate_fill(struct snd_pcm_substream *substream,
2085                                       snd_pcm_uframes_t hw_ptr)
2086 {
2087         struct snd_pcm_runtime *runtime = substream->runtime;
2088         snd_pcm_uframes_t appl_ptr;
2089         appl_ptr = hw_ptr + runtime->buffer_size;
2090         appl_ptr %= runtime->boundary;
2091         runtime->control->appl_ptr = appl_ptr;
2092 }
2093
2094 static int snd_pcm_oss_set_trigger(struct snd_pcm_oss_file *pcm_oss_file, int trigger)
2095 {
2096         struct snd_pcm_runtime *runtime;
2097         struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2098         int err, cmd;
2099
2100 #ifdef OSS_DEBUG
2101         pcm_dbg(substream->pcm, "pcm_oss: trigger = 0x%x\n", trigger);
2102 #endif
2103
2104         psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2105         csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2106
2107         if (psubstream) {
2108                 if ((err = snd_pcm_oss_make_ready(psubstream)) < 0)
2109                         return err;
2110         }
2111         if (csubstream) {
2112                 if ((err = snd_pcm_oss_make_ready(csubstream)) < 0)
2113                         return err;
2114         }
2115         if (psubstream) {
2116                 runtime = psubstream->runtime;
2117                 cmd = 0;
2118                 if (mutex_lock_interruptible(&runtime->oss.params_lock))
2119                         return -ERESTARTSYS;
2120                 if (trigger & PCM_ENABLE_OUTPUT) {
2121                         if (runtime->oss.trigger)
2122                                 goto _skip1;
2123                         if (atomic_read(&psubstream->mmap_count))
2124                                 snd_pcm_oss_simulate_fill(psubstream,
2125                                                 get_hw_ptr_period(runtime));
2126                         runtime->oss.trigger = 1;
2127                         runtime->start_threshold = 1;
2128                         cmd = SNDRV_PCM_IOCTL_START;
2129                 } else {
2130                         if (!runtime->oss.trigger)
2131                                 goto _skip1;
2132                         runtime->oss.trigger = 0;
2133                         runtime->start_threshold = runtime->boundary;
2134                         cmd = SNDRV_PCM_IOCTL_DROP;
2135                         runtime->oss.prepare = 1;
2136                 }
2137  _skip1:
2138                 mutex_unlock(&runtime->oss.params_lock);
2139                 if (cmd) {
2140                         err = snd_pcm_kernel_ioctl(psubstream, cmd, NULL);
2141                         if (err < 0)
2142                                 return err;
2143                 }
2144         }
2145         if (csubstream) {
2146                 runtime = csubstream->runtime;
2147                 cmd = 0;
2148                 if (mutex_lock_interruptible(&runtime->oss.params_lock))
2149                         return -ERESTARTSYS;
2150                 if (trigger & PCM_ENABLE_INPUT) {
2151                         if (runtime->oss.trigger)
2152                                 goto _skip2;
2153                         runtime->oss.trigger = 1;
2154                         runtime->start_threshold = 1;
2155                         cmd = SNDRV_PCM_IOCTL_START;
2156                 } else {
2157                         if (!runtime->oss.trigger)
2158                                 goto _skip2;
2159                         runtime->oss.trigger = 0;
2160                         runtime->start_threshold = runtime->boundary;
2161                         cmd = SNDRV_PCM_IOCTL_DROP;
2162                         runtime->oss.prepare = 1;
2163                 }
2164  _skip2:
2165                 mutex_unlock(&runtime->oss.params_lock);
2166                 if (cmd) {
2167                         err = snd_pcm_kernel_ioctl(csubstream, cmd, NULL);
2168                         if (err < 0)
2169                                 return err;
2170                 }
2171         }
2172         return 0;
2173 }
2174
2175 static int snd_pcm_oss_get_trigger(struct snd_pcm_oss_file *pcm_oss_file)
2176 {
2177         struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2178         int result = 0;
2179
2180         psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2181         csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2182         if (psubstream && psubstream->runtime && psubstream->runtime->oss.trigger)
2183                 result |= PCM_ENABLE_OUTPUT;
2184         if (csubstream && csubstream->runtime && csubstream->runtime->oss.trigger)
2185                 result |= PCM_ENABLE_INPUT;
2186         return result;
2187 }
2188
2189 static int snd_pcm_oss_get_odelay(struct snd_pcm_oss_file *pcm_oss_file)
2190 {
2191         struct snd_pcm_substream *substream;
2192         struct snd_pcm_runtime *runtime;
2193         snd_pcm_sframes_t delay;
2194         int err;
2195
2196         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2197         if (substream == NULL)
2198                 return -EINVAL;
2199         if ((err = snd_pcm_oss_make_ready(substream)) < 0)
2200                 return err;
2201         runtime = substream->runtime;
2202         if (runtime->oss.params || runtime->oss.prepare)
2203                 return 0;
2204         err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay);
2205         if (err == -EPIPE)
2206                 delay = 0;      /* hack for broken OSS applications */
2207         else if (err < 0)
2208                 return err;
2209         return snd_pcm_oss_bytes(substream, delay);
2210 }
2211
2212 static int snd_pcm_oss_get_ptr(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct count_info __user * _info)
2213 {
2214         struct snd_pcm_substream *substream;
2215         struct snd_pcm_runtime *runtime;
2216         snd_pcm_sframes_t delay;
2217         int fixup;
2218         struct count_info info;
2219         int err;
2220
2221         if (_info == NULL)
2222                 return -EFAULT;
2223         substream = pcm_oss_file->streams[stream];
2224         if (substream == NULL)
2225                 return -EINVAL;
2226         if ((err = snd_pcm_oss_make_ready(substream)) < 0)
2227                 return err;
2228         runtime = substream->runtime;
2229         if (runtime->oss.params || runtime->oss.prepare) {
2230                 memset(&info, 0, sizeof(info));
2231                 if (copy_to_user(_info, &info, sizeof(info)))
2232                         return -EFAULT;
2233                 return 0;
2234         }
2235         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2236                 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay);
2237                 if (err == -EPIPE || err == -ESTRPIPE || (! err && delay < 0)) {
2238                         err = 0;
2239                         delay = 0;
2240                         fixup = 0;
2241                 } else {
2242                         fixup = runtime->oss.buffer_used;
2243                 }
2244         } else {
2245                 err = snd_pcm_oss_capture_position_fixup(substream, &delay);
2246                 fixup = -runtime->oss.buffer_used;
2247         }
2248         if (err < 0)
2249                 return err;
2250         info.ptr = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr % runtime->buffer_size);
2251         if (atomic_read(&substream->mmap_count)) {
2252                 snd_pcm_sframes_t n;
2253                 delay = get_hw_ptr_period(runtime);
2254                 n = delay - runtime->oss.prev_hw_ptr_period;
2255                 if (n < 0)
2256                         n += runtime->boundary;
2257                 info.blocks = n / runtime->period_size;
2258                 runtime->oss.prev_hw_ptr_period = delay;
2259                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2260                         snd_pcm_oss_simulate_fill(substream, delay);
2261                 info.bytes = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr) & INT_MAX;
2262         } else {
2263                 delay = snd_pcm_oss_bytes(substream, delay);
2264                 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2265                         if (substream->oss.setup.buggyptr)
2266                                 info.blocks = (runtime->oss.buffer_bytes - delay - fixup) / runtime->oss.period_bytes;
2267                         else
2268                                 info.blocks = (delay + fixup) / runtime->oss.period_bytes;
2269                         info.bytes = (runtime->oss.bytes - delay) & INT_MAX;
2270                 } else {
2271                         delay += fixup;
2272                         info.blocks = delay / runtime->oss.period_bytes;
2273                         info.bytes = (runtime->oss.bytes + delay) & INT_MAX;
2274                 }
2275         }
2276         if (copy_to_user(_info, &info, sizeof(info)))
2277                 return -EFAULT;
2278         return 0;
2279 }
2280
2281 static int snd_pcm_oss_get_space(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct audio_buf_info __user *_info)
2282 {
2283         struct snd_pcm_substream *substream;
2284         struct snd_pcm_runtime *runtime;
2285         snd_pcm_sframes_t avail;
2286         int fixup;
2287         struct audio_buf_info info;
2288         int err;
2289
2290         if (_info == NULL)
2291                 return -EFAULT;
2292         substream = pcm_oss_file->streams[stream];
2293         if (substream == NULL)
2294                 return -EINVAL;
2295         runtime = substream->runtime;
2296
2297         if (runtime->oss.params &&
2298             (err = snd_pcm_oss_change_params(substream, false)) < 0)
2299                 return err;
2300
2301         info.fragsize = runtime->oss.period_bytes;
2302         info.fragstotal = runtime->periods;
2303         if (runtime->oss.prepare) {
2304                 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2305                         info.bytes = runtime->oss.period_bytes * runtime->oss.periods;
2306                         info.fragments = runtime->oss.periods;
2307                 } else {
2308                         info.bytes = 0;
2309                         info.fragments = 0;
2310                 }
2311         } else {
2312                 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2313                         err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &avail);
2314                         if (err == -EPIPE || err == -ESTRPIPE || (! err && avail < 0)) {
2315                                 avail = runtime->buffer_size;
2316                                 err = 0;
2317                                 fixup = 0;
2318                         } else {
2319                                 avail = runtime->buffer_size - avail;
2320                                 fixup = -runtime->oss.buffer_used;
2321                         }
2322                 } else {
2323                         err = snd_pcm_oss_capture_position_fixup(substream, &avail);
2324                         fixup = runtime->oss.buffer_used;
2325                 }
2326                 if (err < 0)
2327                         return err;
2328                 info.bytes = snd_pcm_oss_bytes(substream, avail) + fixup;
2329                 info.fragments = info.bytes / runtime->oss.period_bytes;
2330         }
2331
2332 #ifdef OSS_DEBUG
2333         pcm_dbg(substream->pcm,
2334                 "pcm_oss: space: bytes = %i, fragments = %i, fragstotal = %i, fragsize = %i\n",
2335                 info.bytes, info.fragments, info.fragstotal, info.fragsize);
2336 #endif
2337         if (copy_to_user(_info, &info, sizeof(info)))
2338                 return -EFAULT;
2339         return 0;
2340 }
2341
2342 static int snd_pcm_oss_get_mapbuf(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct buffmem_desc __user * _info)
2343 {
2344         // it won't be probably implemented
2345         // pr_debug("TODO: snd_pcm_oss_get_mapbuf\n");
2346         return -EINVAL;
2347 }
2348
2349 static const char *strip_task_path(const char *path)
2350 {
2351         const char *ptr, *ptrl = NULL;
2352         for (ptr = path; *ptr; ptr++) {
2353                 if (*ptr == '/')
2354                         ptrl = ptr + 1;
2355         }
2356         return ptrl;
2357 }
2358
2359 static void snd_pcm_oss_look_for_setup(struct snd_pcm *pcm, int stream,
2360                                       const char *task_name,
2361                                       struct snd_pcm_oss_setup *rsetup)
2362 {
2363         struct snd_pcm_oss_setup *setup;
2364
2365         mutex_lock(&pcm->streams[stream].oss.setup_mutex);
2366         do {
2367                 for (setup = pcm->streams[stream].oss.setup_list; setup;
2368                      setup = setup->next) {
2369                         if (!strcmp(setup->task_name, task_name))
2370                                 goto out;
2371                 }
2372         } while ((task_name = strip_task_path(task_name)) != NULL);
2373  out:
2374         if (setup)
2375                 *rsetup = *setup;
2376         mutex_unlock(&pcm->streams[stream].oss.setup_mutex);
2377 }
2378
2379 static void snd_pcm_oss_release_substream(struct snd_pcm_substream *substream)
2380 {
2381         struct snd_pcm_runtime *runtime;
2382         runtime = substream->runtime;
2383         vfree(runtime->oss.buffer);
2384         runtime->oss.buffer = NULL;
2385 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
2386         snd_pcm_oss_plugin_clear(substream);
2387 #endif
2388         substream->oss.oss = 0;
2389 }
2390
2391 static void snd_pcm_oss_init_substream(struct snd_pcm_substream *substream,
2392                                        struct snd_pcm_oss_setup *setup,
2393                                        int minor)
2394 {
2395         struct snd_pcm_runtime *runtime;
2396
2397         substream->oss.oss = 1;
2398         substream->oss.setup = *setup;
2399         if (setup->nonblock)
2400                 substream->f_flags |= O_NONBLOCK;
2401         else if (setup->block)
2402                 substream->f_flags &= ~O_NONBLOCK;
2403         runtime = substream->runtime;
2404         runtime->oss.params = 1;
2405         runtime->oss.trigger = 1;
2406         runtime->oss.rate = 8000;
2407         mutex_init(&runtime->oss.params_lock);
2408         switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
2409         case SNDRV_MINOR_OSS_PCM_8:
2410                 runtime->oss.format = AFMT_U8;
2411                 break;
2412         case SNDRV_MINOR_OSS_PCM_16:
2413                 runtime->oss.format = AFMT_S16_LE;
2414                 break;
2415         default:
2416                 runtime->oss.format = AFMT_MU_LAW;
2417         }
2418         runtime->oss.channels = 1;
2419         runtime->oss.fragshift = 0;
2420         runtime->oss.maxfrags = 0;
2421         runtime->oss.subdivision = 0;
2422         substream->pcm_release = snd_pcm_oss_release_substream;
2423         atomic_set(&runtime->oss.rw_ref, 0);
2424 }
2425
2426 static int snd_pcm_oss_release_file(struct snd_pcm_oss_file *pcm_oss_file)
2427 {
2428         int cidx;
2429         if (!pcm_oss_file)
2430                 return 0;
2431         for (cidx = 0; cidx < 2; ++cidx) {
2432                 struct snd_pcm_substream *substream = pcm_oss_file->streams[cidx];
2433                 if (substream)
2434                         snd_pcm_release_substream(substream);
2435         }
2436         kfree(pcm_oss_file);
2437         return 0;
2438 }
2439
2440 static int snd_pcm_oss_open_file(struct file *file,
2441                                  struct snd_pcm *pcm,
2442                                  struct snd_pcm_oss_file **rpcm_oss_file,
2443                                  int minor,
2444                                  struct snd_pcm_oss_setup *setup)
2445 {
2446         int idx, err;
2447         struct snd_pcm_oss_file *pcm_oss_file;
2448         struct snd_pcm_substream *substream;
2449         fmode_t f_mode = file->f_mode;
2450
2451         if (rpcm_oss_file)
2452                 *rpcm_oss_file = NULL;
2453
2454         pcm_oss_file = kzalloc(sizeof(*pcm_oss_file), GFP_KERNEL);
2455         if (pcm_oss_file == NULL)
2456                 return -ENOMEM;
2457
2458         if ((f_mode & (FMODE_WRITE|FMODE_READ)) == (FMODE_WRITE|FMODE_READ) &&
2459             (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX))
2460                 f_mode = FMODE_WRITE;
2461
2462         file->f_flags &= ~O_APPEND;
2463         for (idx = 0; idx < 2; idx++) {
2464                 if (setup[idx].disable)
2465                         continue;
2466                 if (! pcm->streams[idx].substream_count)
2467                         continue; /* no matching substream */
2468                 if (idx == SNDRV_PCM_STREAM_PLAYBACK) {
2469                         if (! (f_mode & FMODE_WRITE))
2470                                 continue;
2471                 } else {
2472                         if (! (f_mode & FMODE_READ))
2473                                 continue;
2474                 }
2475                 err = snd_pcm_open_substream(pcm, idx, file, &substream);
2476                 if (err < 0) {
2477                         snd_pcm_oss_release_file(pcm_oss_file);
2478                         return err;
2479                 }
2480
2481                 pcm_oss_file->streams[idx] = substream;
2482                 substream->file = pcm_oss_file;
2483                 snd_pcm_oss_init_substream(substream, &setup[idx], minor);
2484         }
2485
2486         if (!pcm_oss_file->streams[0] && !pcm_oss_file->streams[1]) {
2487                 snd_pcm_oss_release_file(pcm_oss_file);
2488                 return -EINVAL;
2489         }
2490
2491         file->private_data = pcm_oss_file;
2492         if (rpcm_oss_file)
2493                 *rpcm_oss_file = pcm_oss_file;
2494         return 0;
2495 }
2496
2497
2498 static int snd_task_name(struct task_struct *task, char *name, size_t size)
2499 {
2500         unsigned int idx;
2501
2502         if (snd_BUG_ON(!task || !name || size < 2))
2503                 return -EINVAL;
2504         for (idx = 0; idx < sizeof(task->comm) && idx + 1 < size; idx++)
2505                 name[idx] = task->comm[idx];
2506         name[idx] = '\0';
2507         return 0;
2508 }
2509
2510 static int snd_pcm_oss_open(struct inode *inode, struct file *file)
2511 {
2512         int err;
2513         char task_name[32];
2514         struct snd_pcm *pcm;
2515         struct snd_pcm_oss_file *pcm_oss_file;
2516         struct snd_pcm_oss_setup setup[2];
2517         int nonblock;
2518         wait_queue_t wait;
2519
2520         err = nonseekable_open(inode, file);
2521         if (err < 0)
2522                 return err;
2523
2524         pcm = snd_lookup_oss_minor_data(iminor(inode),
2525                                         SNDRV_OSS_DEVICE_TYPE_PCM);
2526         if (pcm == NULL) {
2527                 err = -ENODEV;
2528                 goto __error1;
2529         }
2530         err = snd_card_file_add(pcm->card, file);
2531         if (err < 0)
2532                 goto __error1;
2533         if (!try_module_get(pcm->card->module)) {
2534                 err = -EFAULT;
2535                 goto __error2;
2536         }
2537         if (snd_task_name(current, task_name, sizeof(task_name)) < 0) {
2538                 err = -EFAULT;
2539                 goto __error;
2540         }
2541         memset(setup, 0, sizeof(setup));
2542         if (file->f_mode & FMODE_WRITE)
2543                 snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_PLAYBACK,
2544                                            task_name, &setup[0]);
2545         if (file->f_mode & FMODE_READ)
2546                 snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_CAPTURE,
2547                                            task_name, &setup[1]);
2548
2549         nonblock = !!(file->f_flags & O_NONBLOCK);
2550         if (!nonblock)
2551                 nonblock = nonblock_open;
2552
2553         init_waitqueue_entry(&wait, current);
2554         add_wait_queue(&pcm->open_wait, &wait);
2555         mutex_lock(&pcm->open_mutex);
2556         while (1) {
2557                 err = snd_pcm_oss_open_file(file, pcm, &pcm_oss_file,
2558                                             iminor(inode), setup);
2559                 if (err >= 0)
2560                         break;
2561                 if (err == -EAGAIN) {
2562                         if (nonblock) {
2563                                 err = -EBUSY;
2564                                 break;
2565                         }
2566                 } else
2567                         break;
2568                 set_current_state(TASK_INTERRUPTIBLE);
2569                 mutex_unlock(&pcm->open_mutex);
2570                 schedule();
2571                 mutex_lock(&pcm->open_mutex);
2572                 if (pcm->card->shutdown) {
2573                         err = -ENODEV;
2574                         break;
2575                 }
2576                 if (signal_pending(current)) {
2577                         err = -ERESTARTSYS;
2578                         break;
2579                 }
2580         }
2581         remove_wait_queue(&pcm->open_wait, &wait);
2582         mutex_unlock(&pcm->open_mutex);
2583         if (err < 0)
2584                 goto __error;
2585         snd_card_unref(pcm->card);
2586         return err;
2587
2588       __error:
2589         module_put(pcm->card->module);
2590       __error2:
2591         snd_card_file_remove(pcm->card, file);
2592       __error1:
2593         if (pcm)
2594                 snd_card_unref(pcm->card);
2595         return err;
2596 }
2597
2598 static int snd_pcm_oss_release(struct inode *inode, struct file *file)
2599 {
2600         struct snd_pcm *pcm;
2601         struct snd_pcm_substream *substream;
2602         struct snd_pcm_oss_file *pcm_oss_file;
2603
2604         pcm_oss_file = file->private_data;
2605         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2606         if (substream == NULL)
2607                 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2608         if (snd_BUG_ON(!substream))
2609                 return -ENXIO;
2610         pcm = substream->pcm;
2611         if (!pcm->card->shutdown)
2612                 snd_pcm_oss_sync(pcm_oss_file);
2613         mutex_lock(&pcm->open_mutex);
2614         snd_pcm_oss_release_file(pcm_oss_file);
2615         mutex_unlock(&pcm->open_mutex);
2616         wake_up(&pcm->open_wait);
2617         module_put(pcm->card->module);
2618         snd_card_file_remove(pcm->card, file);
2619         return 0;
2620 }
2621
2622 static long snd_pcm_oss_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2623 {
2624         struct snd_pcm_oss_file *pcm_oss_file;
2625         int __user *p = (int __user *)arg;
2626         int res;
2627
2628         pcm_oss_file = file->private_data;
2629         if (cmd == OSS_GETVERSION)
2630                 return put_user(SNDRV_OSS_VERSION, p);
2631         if (cmd == OSS_ALSAEMULVER)
2632                 return put_user(1, p);
2633 #if defined(CONFIG_SND_MIXER_OSS) || (defined(MODULE) && defined(CONFIG_SND_MIXER_OSS_MODULE))
2634         if (((cmd >> 8) & 0xff) == 'M') {       /* mixer ioctl - for OSS compatibility */
2635                 struct snd_pcm_substream *substream;
2636                 int idx;
2637                 for (idx = 0; idx < 2; ++idx) {
2638                         substream = pcm_oss_file->streams[idx];
2639                         if (substream != NULL)
2640                                 break;
2641                 }
2642                 if (snd_BUG_ON(idx >= 2))
2643                         return -ENXIO;
2644                 return snd_mixer_oss_ioctl_card(substream->pcm->card, cmd, arg);
2645         }
2646 #endif
2647         if (((cmd >> 8) & 0xff) != 'P')
2648                 return -EINVAL;
2649 #ifdef OSS_DEBUG
2650         pr_debug("pcm_oss: ioctl = 0x%x\n", cmd);
2651 #endif
2652         switch (cmd) {
2653         case SNDCTL_DSP_RESET:
2654                 return snd_pcm_oss_reset(pcm_oss_file);
2655         case SNDCTL_DSP_SYNC:
2656                 return snd_pcm_oss_sync(pcm_oss_file);
2657         case SNDCTL_DSP_SPEED:
2658                 if (get_user(res, p))
2659                         return -EFAULT;
2660                 if ((res = snd_pcm_oss_set_rate(pcm_oss_file, res))<0)
2661                         return res;
2662                 return put_user(res, p);
2663         case SOUND_PCM_READ_RATE:
2664                 res = snd_pcm_oss_get_rate(pcm_oss_file);
2665                 if (res < 0)
2666                         return res;
2667                 return put_user(res, p);
2668         case SNDCTL_DSP_STEREO:
2669                 if (get_user(res, p))
2670                         return -EFAULT;
2671                 res = res > 0 ? 2 : 1;
2672                 if ((res = snd_pcm_oss_set_channels(pcm_oss_file, res)) < 0)
2673                         return res;
2674                 return put_user(--res, p);
2675         case SNDCTL_DSP_GETBLKSIZE:
2676                 res = snd_pcm_oss_get_block_size(pcm_oss_file);
2677                 if (res < 0)
2678                         return res;
2679                 return put_user(res, p);
2680         case SNDCTL_DSP_SETFMT:
2681                 if (get_user(res, p))
2682                         return -EFAULT;
2683                 res = snd_pcm_oss_set_format(pcm_oss_file, res);
2684                 if (res < 0)
2685                         return res;
2686                 return put_user(res, p);
2687         case SOUND_PCM_READ_BITS:
2688                 res = snd_pcm_oss_get_format(pcm_oss_file);
2689                 if (res < 0)
2690                         return res;
2691                 return put_user(res, p);
2692         case SNDCTL_DSP_CHANNELS:
2693                 if (get_user(res, p))
2694                         return -EFAULT;
2695                 res = snd_pcm_oss_set_channels(pcm_oss_file, res);
2696                 if (res < 0)
2697                         return res;
2698                 return put_user(res, p);
2699         case SOUND_PCM_READ_CHANNELS:
2700                 res = snd_pcm_oss_get_channels(pcm_oss_file);
2701                 if (res < 0)
2702                         return res;
2703                 return put_user(res, p);
2704         case SOUND_PCM_WRITE_FILTER:
2705         case SOUND_PCM_READ_FILTER:
2706                 return -EIO;
2707         case SNDCTL_DSP_POST:
2708                 return snd_pcm_oss_post(pcm_oss_file);
2709         case SNDCTL_DSP_SUBDIVIDE:
2710                 if (get_user(res, p))
2711                         return -EFAULT;
2712                 res = snd_pcm_oss_set_subdivide(pcm_oss_file, res);
2713                 if (res < 0)
2714                         return res;
2715                 return put_user(res, p);
2716         case SNDCTL_DSP_SETFRAGMENT:
2717                 if (get_user(res, p))
2718                         return -EFAULT;
2719                 return snd_pcm_oss_set_fragment(pcm_oss_file, res);
2720         case SNDCTL_DSP_GETFMTS:
2721                 res = snd_pcm_oss_get_formats(pcm_oss_file);
2722                 if (res < 0)
2723                         return res;
2724                 return put_user(res, p);
2725         case SNDCTL_DSP_GETOSPACE:
2726         case SNDCTL_DSP_GETISPACE:
2727                 return snd_pcm_oss_get_space(pcm_oss_file,
2728                         cmd == SNDCTL_DSP_GETISPACE ?
2729                                 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2730                         (struct audio_buf_info __user *) arg);
2731         case SNDCTL_DSP_NONBLOCK:
2732                 return snd_pcm_oss_nonblock(file);
2733         case SNDCTL_DSP_GETCAPS:
2734                 res = snd_pcm_oss_get_caps(pcm_oss_file);
2735                 if (res < 0)
2736                         return res;
2737                 return put_user(res, p);
2738         case SNDCTL_DSP_GETTRIGGER:
2739                 res = snd_pcm_oss_get_trigger(pcm_oss_file);
2740                 if (res < 0)
2741                         return res;
2742                 return put_user(res, p);
2743         case SNDCTL_DSP_SETTRIGGER:
2744                 if (get_user(res, p))
2745                         return -EFAULT;
2746                 return snd_pcm_oss_set_trigger(pcm_oss_file, res);
2747         case SNDCTL_DSP_GETIPTR:
2748         case SNDCTL_DSP_GETOPTR:
2749                 return snd_pcm_oss_get_ptr(pcm_oss_file,
2750                         cmd == SNDCTL_DSP_GETIPTR ?
2751                                 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2752                         (struct count_info __user *) arg);
2753         case SNDCTL_DSP_MAPINBUF:
2754         case SNDCTL_DSP_MAPOUTBUF:
2755                 return snd_pcm_oss_get_mapbuf(pcm_oss_file,
2756                         cmd == SNDCTL_DSP_MAPINBUF ?
2757                                 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2758                         (struct buffmem_desc __user *) arg);
2759         case SNDCTL_DSP_SETSYNCRO:
2760                 /* stop DMA now.. */
2761                 return 0;
2762         case SNDCTL_DSP_SETDUPLEX:
2763                 if (snd_pcm_oss_get_caps(pcm_oss_file) & DSP_CAP_DUPLEX)
2764                         return 0;
2765                 return -EIO;
2766         case SNDCTL_DSP_GETODELAY:
2767                 res = snd_pcm_oss_get_odelay(pcm_oss_file);
2768                 if (res < 0) {
2769                         /* it's for sure, some broken apps don't check for error codes */
2770                         put_user(0, p);
2771                         return res;
2772                 }
2773                 return put_user(res, p);
2774         case SNDCTL_DSP_PROFILE:
2775                 return 0;       /* silently ignore */
2776         default:
2777                 pr_debug("pcm_oss: unknown command = 0x%x\n", cmd);
2778         }
2779         return -EINVAL;
2780 }
2781
2782 #ifdef CONFIG_COMPAT
2783 /* all compatible */
2784 static long snd_pcm_oss_ioctl_compat(struct file *file, unsigned int cmd,
2785                                      unsigned long arg)
2786 {
2787         return snd_pcm_oss_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
2788 }
2789 #else
2790 #define snd_pcm_oss_ioctl_compat        NULL
2791 #endif
2792
2793 static ssize_t snd_pcm_oss_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
2794 {
2795         struct snd_pcm_oss_file *pcm_oss_file;
2796         struct snd_pcm_substream *substream;
2797
2798         pcm_oss_file = file->private_data;
2799         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2800         if (substream == NULL)
2801                 return -ENXIO;
2802         substream->f_flags = file->f_flags & O_NONBLOCK;
2803 #ifndef OSS_DEBUG
2804         return snd_pcm_oss_read1(substream, buf, count);
2805 #else
2806         {
2807                 ssize_t res = snd_pcm_oss_read1(substream, buf, count);
2808                 pcm_dbg(substream->pcm,
2809                         "pcm_oss: read %li bytes (returned %li bytes)\n",
2810                         (long)count, (long)res);
2811                 return res;
2812         }
2813 #endif
2814 }
2815
2816 static ssize_t snd_pcm_oss_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
2817 {
2818         struct snd_pcm_oss_file *pcm_oss_file;
2819         struct snd_pcm_substream *substream;
2820         long result;
2821
2822         pcm_oss_file = file->private_data;
2823         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2824         if (substream == NULL)
2825                 return -ENXIO;
2826         substream->f_flags = file->f_flags & O_NONBLOCK;
2827         result = snd_pcm_oss_write1(substream, buf, count);
2828 #ifdef OSS_DEBUG
2829         pcm_dbg(substream->pcm, "pcm_oss: write %li bytes (wrote %li bytes)\n",
2830                (long)count, (long)result);
2831 #endif
2832         return result;
2833 }
2834
2835 static int snd_pcm_oss_playback_ready(struct snd_pcm_substream *substream)
2836 {
2837         struct snd_pcm_runtime *runtime = substream->runtime;
2838         if (atomic_read(&substream->mmap_count))
2839                 return runtime->oss.prev_hw_ptr_period !=
2840                                                 get_hw_ptr_period(runtime);
2841         else
2842                 return snd_pcm_playback_avail(runtime) >=
2843                                                 runtime->oss.period_frames;
2844 }
2845
2846 static int snd_pcm_oss_capture_ready(struct snd_pcm_substream *substream)
2847 {
2848         struct snd_pcm_runtime *runtime = substream->runtime;
2849         if (atomic_read(&substream->mmap_count))
2850                 return runtime->oss.prev_hw_ptr_period !=
2851                                                 get_hw_ptr_period(runtime);
2852         else
2853                 return snd_pcm_capture_avail(runtime) >=
2854                                                 runtime->oss.period_frames;
2855 }
2856
2857 static unsigned int snd_pcm_oss_poll(struct file *file, poll_table * wait)
2858 {
2859         struct snd_pcm_oss_file *pcm_oss_file;
2860         unsigned int mask;
2861         struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2862
2863         pcm_oss_file = file->private_data;
2864
2865         psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2866         csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2867
2868         mask = 0;
2869         if (psubstream != NULL) {
2870                 struct snd_pcm_runtime *runtime = psubstream->runtime;
2871                 poll_wait(file, &runtime->sleep, wait);
2872                 snd_pcm_stream_lock_irq(psubstream);
2873                 if (runtime->status->state != SNDRV_PCM_STATE_DRAINING &&
2874                     (runtime->status->state != SNDRV_PCM_STATE_RUNNING ||
2875                      snd_pcm_oss_playback_ready(psubstream)))
2876                         mask |= POLLOUT | POLLWRNORM;
2877                 snd_pcm_stream_unlock_irq(psubstream);
2878         }
2879         if (csubstream != NULL) {
2880                 struct snd_pcm_runtime *runtime = csubstream->runtime;
2881                 snd_pcm_state_t ostate;
2882                 poll_wait(file, &runtime->sleep, wait);
2883                 snd_pcm_stream_lock_irq(csubstream);
2884                 if ((ostate = runtime->status->state) != SNDRV_PCM_STATE_RUNNING ||
2885                     snd_pcm_oss_capture_ready(csubstream))
2886                         mask |= POLLIN | POLLRDNORM;
2887                 snd_pcm_stream_unlock_irq(csubstream);
2888                 if (ostate != SNDRV_PCM_STATE_RUNNING && runtime->oss.trigger) {
2889                         struct snd_pcm_oss_file ofile;
2890                         memset(&ofile, 0, sizeof(ofile));
2891                         ofile.streams[SNDRV_PCM_STREAM_CAPTURE] = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2892                         runtime->oss.trigger = 0;
2893                         snd_pcm_oss_set_trigger(&ofile, PCM_ENABLE_INPUT);
2894                 }
2895         }
2896
2897         return mask;
2898 }
2899
2900 static int snd_pcm_oss_mmap(struct file *file, struct vm_area_struct *area)
2901 {
2902         struct snd_pcm_oss_file *pcm_oss_file;
2903         struct snd_pcm_substream *substream = NULL;
2904         struct snd_pcm_runtime *runtime;
2905         int err;
2906
2907 #ifdef OSS_DEBUG
2908         pr_debug("pcm_oss: mmap begin\n");
2909 #endif
2910         pcm_oss_file = file->private_data;
2911         switch ((area->vm_flags & (VM_READ | VM_WRITE))) {
2912         case VM_READ | VM_WRITE:
2913                 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2914                 if (substream)
2915                         break;
2916                 /* Fall through */
2917         case VM_READ:
2918                 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2919                 break;
2920         case VM_WRITE:
2921                 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2922                 break;
2923         default:
2924                 return -EINVAL;
2925         }
2926         /* set VM_READ access as well to fix memset() routines that do
2927            reads before writes (to improve performance) */
2928         area->vm_flags |= VM_READ;
2929         if (substream == NULL)
2930                 return -ENXIO;
2931         runtime = substream->runtime;
2932         if (!(runtime->info & SNDRV_PCM_INFO_MMAP_VALID))
2933                 return -EIO;
2934         if (runtime->info & SNDRV_PCM_INFO_INTERLEAVED)
2935                 runtime->access = SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2936         else
2937                 return -EIO;
2938
2939         if (runtime->oss.params) {
2940                 /* use mutex_trylock() for params_lock for avoiding a deadlock
2941                  * between mmap_sem and params_lock taken by
2942                  * copy_from/to_user() in snd_pcm_oss_write/read()
2943                  */
2944                 err = snd_pcm_oss_change_params(substream, true);
2945                 if (err < 0)
2946                         return err;
2947         }
2948 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
2949         if (runtime->oss.plugin_first != NULL)
2950                 return -EIO;
2951 #endif
2952
2953         if (area->vm_pgoff != 0)
2954                 return -EINVAL;
2955
2956         err = snd_pcm_mmap_data(substream, file, area);
2957         if (err < 0)
2958                 return err;
2959         runtime->oss.mmap_bytes = area->vm_end - area->vm_start;
2960         runtime->silence_threshold = 0;
2961         runtime->silence_size = 0;
2962 #ifdef OSS_DEBUG
2963         pr_debug("pcm_oss: mmap ok, bytes = 0x%x\n",
2964                runtime->oss.mmap_bytes);
2965 #endif
2966         /* In mmap mode we never stop */
2967         runtime->stop_threshold = runtime->boundary;
2968
2969         return 0;
2970 }
2971
2972 #ifdef CONFIG_SND_VERBOSE_PROCFS
2973 /*
2974  *  /proc interface
2975  */
2976
2977 static void snd_pcm_oss_proc_read(struct snd_info_entry *entry,
2978                                   struct snd_info_buffer *buffer)
2979 {
2980         struct snd_pcm_str *pstr = entry->private_data;
2981         struct snd_pcm_oss_setup *setup = pstr->oss.setup_list;
2982         mutex_lock(&pstr->oss.setup_mutex);
2983         while (setup) {
2984                 snd_iprintf(buffer, "%s %u %u%s%s%s%s%s%s\n",
2985                             setup->task_name,
2986                             setup->periods,
2987                             setup->period_size,
2988                             setup->disable ? " disable" : "",
2989                             setup->direct ? " direct" : "",
2990                             setup->block ? " block" : "",
2991                             setup->nonblock ? " non-block" : "",
2992                             setup->partialfrag ? " partial-frag" : "",
2993                             setup->nosilence ? " no-silence" : "");
2994                 setup = setup->next;
2995         }
2996         mutex_unlock(&pstr->oss.setup_mutex);
2997 }
2998
2999 static void snd_pcm_oss_proc_free_setup_list(struct snd_pcm_str * pstr)
3000 {
3001         struct snd_pcm_oss_setup *setup, *setupn;
3002
3003         for (setup = pstr->oss.setup_list, pstr->oss.setup_list = NULL;
3004              setup; setup = setupn) {
3005                 setupn = setup->next;
3006                 kfree(setup->task_name);
3007                 kfree(setup);
3008         }
3009         pstr->oss.setup_list = NULL;
3010 }
3011
3012 static void snd_pcm_oss_proc_write(struct snd_info_entry *entry,
3013                                    struct snd_info_buffer *buffer)
3014 {
3015         struct snd_pcm_str *pstr = entry->private_data;
3016         char line[128], str[32], task_name[32];
3017         const char *ptr;
3018         int idx1;
3019         struct snd_pcm_oss_setup *setup, *setup1, template;
3020
3021         while (!snd_info_get_line(buffer, line, sizeof(line))) {
3022                 mutex_lock(&pstr->oss.setup_mutex);
3023                 memset(&template, 0, sizeof(template));
3024                 ptr = snd_info_get_str(task_name, line, sizeof(task_name));
3025                 if (!strcmp(task_name, "clear") || !strcmp(task_name, "erase")) {
3026                         snd_pcm_oss_proc_free_setup_list(pstr);
3027                         mutex_unlock(&pstr->oss.setup_mutex);
3028                         continue;
3029                 }
3030                 for (setup = pstr->oss.setup_list; setup; setup = setup->next) {
3031                         if (!strcmp(setup->task_name, task_name)) {
3032                                 template = *setup;
3033                                 break;
3034                         }
3035                 }
3036                 ptr = snd_info_get_str(str, ptr, sizeof(str));
3037                 template.periods = simple_strtoul(str, NULL, 10);
3038                 ptr = snd_info_get_str(str, ptr, sizeof(str));
3039                 template.period_size = simple_strtoul(str, NULL, 10);
3040                 for (idx1 = 31; idx1 >= 0; idx1--)
3041                         if (template.period_size & (1 << idx1))
3042                                 break;
3043                 for (idx1--; idx1 >= 0; idx1--)
3044                         template.period_size &= ~(1 << idx1);
3045                 do {
3046                         ptr = snd_info_get_str(str, ptr, sizeof(str));
3047                         if (!strcmp(str, "disable")) {
3048                                 template.disable = 1;
3049                         } else if (!strcmp(str, "direct")) {
3050                                 template.direct = 1;
3051                         } else if (!strcmp(str, "block")) {
3052                                 template.block = 1;
3053                         } else if (!strcmp(str, "non-block")) {
3054                                 template.nonblock = 1;
3055                         } else if (!strcmp(str, "partial-frag")) {
3056                                 template.partialfrag = 1;
3057                         } else if (!strcmp(str, "no-silence")) {
3058                                 template.nosilence = 1;
3059                         } else if (!strcmp(str, "buggy-ptr")) {
3060                                 template.buggyptr = 1;
3061                         }
3062                 } while (*str);
3063                 if (setup == NULL) {
3064                         setup = kmalloc(sizeof(*setup), GFP_KERNEL);
3065                         if (! setup) {
3066                                 buffer->error = -ENOMEM;
3067                                 mutex_unlock(&pstr->oss.setup_mutex);
3068                                 return;
3069                         }
3070                         if (pstr->oss.setup_list == NULL)
3071                                 pstr->oss.setup_list = setup;
3072                         else {
3073                                 for (setup1 = pstr->oss.setup_list;
3074                                      setup1->next; setup1 = setup1->next);
3075                                 setup1->next = setup;
3076                         }
3077                         template.task_name = kstrdup(task_name, GFP_KERNEL);
3078                         if (! template.task_name) {
3079                                 kfree(setup);
3080                                 buffer->error = -ENOMEM;
3081                                 mutex_unlock(&pstr->oss.setup_mutex);
3082                                 return;
3083                         }
3084                 }
3085                 *setup = template;
3086                 mutex_unlock(&pstr->oss.setup_mutex);
3087         }
3088 }
3089
3090 static void snd_pcm_oss_proc_init(struct snd_pcm *pcm)
3091 {
3092         int stream;
3093         for (stream = 0; stream < 2; ++stream) {
3094                 struct snd_info_entry *entry;
3095                 struct snd_pcm_str *pstr = &pcm->streams[stream];
3096                 if (pstr->substream_count == 0)
3097                         continue;
3098                 if ((entry = snd_info_create_card_entry(pcm->card, "oss", pstr->proc_root)) != NULL) {
3099                         entry->content = SNDRV_INFO_CONTENT_TEXT;
3100                         entry->mode = S_IFREG | S_IRUGO | S_IWUSR;
3101                         entry->c.text.read = snd_pcm_oss_proc_read;
3102                         entry->c.text.write = snd_pcm_oss_proc_write;
3103                         entry->private_data = pstr;
3104                         if (snd_info_register(entry) < 0) {
3105                                 snd_info_free_entry(entry);
3106                                 entry = NULL;
3107                         }
3108                 }
3109                 pstr->oss.proc_entry = entry;
3110         }
3111 }
3112
3113 static void snd_pcm_oss_proc_done(struct snd_pcm *pcm)
3114 {
3115         int stream;
3116         for (stream = 0; stream < 2; ++stream) {
3117                 struct snd_pcm_str *pstr = &pcm->streams[stream];
3118                 snd_info_free_entry(pstr->oss.proc_entry);
3119                 pstr->oss.proc_entry = NULL;
3120                 snd_pcm_oss_proc_free_setup_list(pstr);
3121         }
3122 }
3123 #else /* !CONFIG_SND_VERBOSE_PROCFS */
3124 #define snd_pcm_oss_proc_init(pcm)
3125 #define snd_pcm_oss_proc_done(pcm)
3126 #endif /* CONFIG_SND_VERBOSE_PROCFS */
3127
3128 /*
3129  *  ENTRY functions
3130  */
3131
3132 static const struct file_operations snd_pcm_oss_f_reg =
3133 {
3134         .owner =        THIS_MODULE,
3135         .read =         snd_pcm_oss_read,
3136         .write =        snd_pcm_oss_write,
3137         .open =         snd_pcm_oss_open,
3138         .release =      snd_pcm_oss_release,
3139         .llseek =       no_llseek,
3140         .poll =         snd_pcm_oss_poll,
3141         .unlocked_ioctl =       snd_pcm_oss_ioctl,
3142         .compat_ioctl = snd_pcm_oss_ioctl_compat,
3143         .mmap =         snd_pcm_oss_mmap,
3144 };
3145
3146 static void register_oss_dsp(struct snd_pcm *pcm, int index)
3147 {
3148         if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3149                                     pcm->card, index, &snd_pcm_oss_f_reg,
3150                                     pcm) < 0) {
3151                 pcm_err(pcm, "unable to register OSS PCM device %i:%i\n",
3152                            pcm->card->number, pcm->device);
3153         }
3154 }
3155
3156 static int snd_pcm_oss_register_minor(struct snd_pcm *pcm)
3157 {
3158         pcm->oss.reg = 0;
3159         if (dsp_map[pcm->card->number] == (int)pcm->device) {
3160                 char name[128];
3161                 int duplex;
3162                 register_oss_dsp(pcm, 0);
3163                 duplex = (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count > 0 &&
3164                               pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count &&
3165                               !(pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX));
3166                 sprintf(name, "%s%s", pcm->name, duplex ? " (DUPLEX)" : "");
3167 #ifdef SNDRV_OSS_INFO_DEV_AUDIO
3168                 snd_oss_info_register(SNDRV_OSS_INFO_DEV_AUDIO,
3169                                       pcm->card->number,
3170                                       name);
3171 #endif
3172                 pcm->oss.reg++;
3173                 pcm->oss.reg_mask |= 1;
3174         }
3175         if (adsp_map[pcm->card->number] == (int)pcm->device) {
3176                 register_oss_dsp(pcm, 1);
3177                 pcm->oss.reg++;
3178                 pcm->oss.reg_mask |= 2;
3179         }
3180
3181         if (pcm->oss.reg)
3182                 snd_pcm_oss_proc_init(pcm);
3183
3184         return 0;
3185 }
3186
3187 static int snd_pcm_oss_disconnect_minor(struct snd_pcm *pcm)
3188 {
3189         if (pcm->oss.reg) {
3190                 if (pcm->oss.reg_mask & 1) {
3191                         pcm->oss.reg_mask &= ~1;
3192                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3193                                                   pcm->card, 0);
3194                 }
3195                 if (pcm->oss.reg_mask & 2) {
3196                         pcm->oss.reg_mask &= ~2;
3197                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3198                                                   pcm->card, 1);
3199                 }
3200                 if (dsp_map[pcm->card->number] == (int)pcm->device) {
3201 #ifdef SNDRV_OSS_INFO_DEV_AUDIO
3202                         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_AUDIO, pcm->card->number);
3203 #endif
3204                 }
3205                 pcm->oss.reg = 0;
3206         }
3207         return 0;
3208 }
3209
3210 static int snd_pcm_oss_unregister_minor(struct snd_pcm *pcm)
3211 {
3212         snd_pcm_oss_disconnect_minor(pcm);
3213         snd_pcm_oss_proc_done(pcm);
3214         return 0;
3215 }
3216
3217 static struct snd_pcm_notify snd_pcm_oss_notify =
3218 {
3219         .n_register =   snd_pcm_oss_register_minor,
3220         .n_disconnect = snd_pcm_oss_disconnect_minor,
3221         .n_unregister = snd_pcm_oss_unregister_minor,
3222 };
3223
3224 static int __init alsa_pcm_oss_init(void)
3225 {
3226         int i;
3227         int err;
3228
3229         /* check device map table */
3230         for (i = 0; i < SNDRV_CARDS; i++) {
3231                 if (dsp_map[i] < 0 || dsp_map[i] >= SNDRV_PCM_DEVICES) {
3232                         pr_err("ALSA: pcm_oss: invalid dsp_map[%d] = %d\n",
3233                                    i, dsp_map[i]);
3234                         dsp_map[i] = 0;
3235                 }
3236                 if (adsp_map[i] < 0 || adsp_map[i] >= SNDRV_PCM_DEVICES) {
3237                         pr_err("ALSA: pcm_oss: invalid adsp_map[%d] = %d\n",
3238                                    i, adsp_map[i]);
3239                         adsp_map[i] = 1;
3240                 }
3241         }
3242         if ((err = snd_pcm_notify(&snd_pcm_oss_notify, 0)) < 0)
3243                 return err;
3244         return 0;
3245 }
3246
3247 static void __exit alsa_pcm_oss_exit(void)
3248 {
3249         snd_pcm_notify(&snd_pcm_oss_notify, 1);
3250 }
3251
3252 module_init(alsa_pcm_oss_init)
3253 module_exit(alsa_pcm_oss_exit)