sound/usb/line6/capture.c

   1 /*
   2  * Line 6 Linux USB driver
   3  *
   4  * Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
   5  *
   6  *      This program is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU General Public License as
   8  *      published by the Free Software Foundation, version 2.
   9  *
  10  */
  11
  12 #include <linux/slab.h>
  13 #include <sound/core.h>
  14 #include <sound/pcm.h>
  15 #include <sound/pcm_params.h>
  16
  17 #include "capture.h"
  18 #include "driver.h"
  19 #include "pcm.h"
  20
  21 /*
  22         Find a free URB and submit it.
  23 */
  24 static int submit_audio_in_urb(struct snd_line6_pcm *line6pcm)
  25 {
  26         int index;
  27         unsigned long flags;
  28         int i, urb_size;
  29         int ret;
  30         struct urb *urb_in;
  31
  32         spin_lock_irqsave(&line6pcm->in.lock, flags);
  33         index =
  34             find_first_zero_bit(&line6pcm->in.active_urbs, LINE6_ISO_BUFFERS);
  35
  36         if (index < 0 || index >= LINE6_ISO_BUFFERS) {
  37                 spin_unlock_irqrestore(&line6pcm->in.lock, flags);
  38                 dev_err(line6pcm->line6->ifcdev, "no free URB found\n");
  39                 return -EINVAL;
  40         }
  41
  42         urb_in = line6pcm->in.urbs[index];
  43         urb_size = 0;
  44
  45         for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
  46                 struct usb_iso_packet_descriptor *fin =
  47                     &urb_in->iso_frame_desc[i];
  48                 fin->offset = urb_size;
  49                 fin->length = line6pcm->max_packet_size;
  50                 urb_size += line6pcm->max_packet_size;
  51         }
  52
  53         urb_in->transfer_buffer =
  54             line6pcm->in.buffer +
  55             index * LINE6_ISO_PACKETS * line6pcm->max_packet_size;
  56         urb_in->transfer_buffer_length = urb_size;
  57         urb_in->context = line6pcm;
  58
  59         ret = usb_submit_urb(urb_in, GFP_ATOMIC);
  60
  61         if (ret == 0)
  62                 set_bit(index, &line6pcm->in.active_urbs);
  63         else
  64                 dev_err(line6pcm->line6->ifcdev,
  65                         "URB in #%d submission failed (%d)\n", index, ret);
  66
  67         spin_unlock_irqrestore(&line6pcm->in.lock, flags);
  68         return 0;
  69 }
  70
  71 /*
  72         Submit all currently available capture URBs.
  73 */
  74 int line6_submit_audio_in_all_urbs(struct snd_line6_pcm *line6pcm)
  75 {
  76         int ret, i;
  77
  78         for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
  79                 ret = submit_audio_in_urb(line6pcm);
  80                 if (ret < 0)
  81                         return ret;
  82         }
  83
  84         return 0;
  85 }
  86
  87 /*
  88         Unlink all currently active capture URBs.
  89 */
  90 void line6_unlink_audio_in_urbs(struct snd_line6_pcm *line6pcm)
  91 {
  92         unsigned int i;
  93
  94         for (i = 0; i < LINE6_ISO_BUFFERS; i++) {
  95                 if (test_bit(i, &line6pcm->in.active_urbs)) {
  96                         if (!test_and_set_bit(i, &line6pcm->in.unlink_urbs)) {
  97                                 struct urb *u = line6pcm->in.urbs[i];
  98
  99                                 usb_unlink_urb(u);
 100                         }
 101                 }
 102         }
 103 }
 104
 105 /*
 106         Wait until unlinking of all currently active capture URBs has been
 107         finished.
 108 */
 109 void line6_wait_clear_audio_in_urbs(struct snd_line6_pcm *line6pcm)
 110 {
 111         int timeout = HZ;
 112         unsigned int i;
 113         int alive;
 114
 115         do {
 116                 alive = 0;
 117                 for (i = 0; i < LINE6_ISO_BUFFERS; i++) {
 118                         if (test_bit(i, &line6pcm->in.active_urbs))
 119                                 alive++;
 120                 }
 121                 if (!alive)
 122                         break;
 123                 set_current_state(TASK_UNINTERRUPTIBLE);
 124                 schedule_timeout(1);
 125         } while (--timeout > 0);
 126         if (alive)
 127                 snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive);
 128 }
 129
 130 /*
 131         Unlink all currently active capture URBs, and wait for finishing.
 132 */
 133 void line6_unlink_wait_clear_audio_in_urbs(struct snd_line6_pcm *line6pcm)
 134 {
 135         line6_unlink_audio_in_urbs(line6pcm);
 136         line6_wait_clear_audio_in_urbs(line6pcm);
 137 }
 138
 139 /*
 140         Copy data into ALSA capture buffer.
 141 */
 142 void line6_capture_copy(struct snd_line6_pcm *line6pcm, char *fbuf, int fsize)
 143 {
 144         struct snd_pcm_substream *substream =
 145             get_substream(line6pcm, SNDRV_PCM_STREAM_CAPTURE);
 146         struct snd_pcm_runtime *runtime = substream->runtime;
 147         const int bytes_per_frame = line6pcm->properties->bytes_per_frame;
 148         int frames = fsize / bytes_per_frame;
 149
 150         if (runtime == NULL)
 151                 return;
 152
 153         if (line6pcm->in.pos_done + frames > runtime->buffer_size) {
 154                 /*
 155                    The transferred area goes over buffer boundary,
 156                    copy two separate chunks.
 157                  */
 158                 int len;
 159
 160                 len = runtime->buffer_size - line6pcm->in.pos_done;
 161
 162                 if (len > 0) {
 163                         memcpy(runtime->dma_area +
 164                                line6pcm->in.pos_done * bytes_per_frame, fbuf,
 165                                len * bytes_per_frame);
 166                         memcpy(runtime->dma_area, fbuf + len * bytes_per_frame,
 167                                (frames - len) * bytes_per_frame);
 168                 } else {
 169                         /* this is somewhat paranoid */
 170                         dev_err(line6pcm->line6->ifcdev,
 171                                 "driver bug: len = %d\n", len);
 172                 }
 173         } else {
 174                 /* copy single chunk */
 175                 memcpy(runtime->dma_area +
 176                        line6pcm->in.pos_done * bytes_per_frame, fbuf, fsize);
 177         }
 178
 179         line6pcm->in.pos_done += frames;
 180         if (line6pcm->in.pos_done >= runtime->buffer_size)
 181                 line6pcm->in.pos_done -= runtime->buffer_size;
 182 }
 183
 184 void line6_capture_check_period(struct snd_line6_pcm *line6pcm, int length)
 185 {
 186         struct snd_pcm_substream *substream =
 187             get_substream(line6pcm, SNDRV_PCM_STREAM_CAPTURE);
 188
 189         line6pcm->in.bytes += length;
 190         if (line6pcm->in.bytes >= line6pcm->in.period) {
 191                 line6pcm->in.bytes %= line6pcm->in.period;
 192                 snd_pcm_period_elapsed(substream);
 193         }
 194 }
 195
 196 void line6_free_capture_buffer(struct snd_line6_pcm *line6pcm)
 197 {
 198         kfree(line6pcm->in.buffer);
 199         line6pcm->in.buffer = NULL;
 200 }
 201
 202 /*
 203  * Callback for completed capture URB.
 204  */
 205 static void audio_in_callback(struct urb *urb)
 206 {
 207         int i, index, length = 0, shutdown = 0;
 208         unsigned long flags;
 209
 210         struct snd_line6_pcm *line6pcm = (struct snd_line6_pcm *)urb->context;
 211
 212         line6pcm->in.last_frame = urb->start_frame;
 213
 214         /* find index of URB */
 215         for (index = 0; index < LINE6_ISO_BUFFERS; ++index)
 216                 if (urb == line6pcm->in.urbs[index])
 217                         break;
 218
 219         spin_lock_irqsave(&line6pcm->in.lock, flags);
 220
 221         for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
 222                 char *fbuf;
 223                 int fsize;
 224                 struct usb_iso_packet_descriptor *fin = &urb->iso_frame_desc[i];
 225
 226                 if (fin->status == -EXDEV) {
 227                         shutdown = 1;
 228                         break;
 229                 }
 230
 231                 fbuf = urb->transfer_buffer + fin->offset;
 232                 fsize = fin->actual_length;
 233
 234                 if (fsize > line6pcm->max_packet_size) {
 235                         dev_err(line6pcm->line6->ifcdev,
 236                                 "driver and/or device bug: packet too large (%d > %d)\n",
 237                                 fsize, line6pcm->max_packet_size);
 238                 }
 239
 240                 length += fsize;
 241
 242                 /* the following assumes LINE6_ISO_PACKETS == 1: */
 243                 line6pcm->prev_fbuf = fbuf;
 244                 line6pcm->prev_fsize = fsize;
 245
 246                 if (!(line6pcm->flags & LINE6_BITS_PCM_IMPULSE))
 247                         if (test_bit(LINE6_INDEX_PCM_ALSA_CAPTURE_STREAM,
 248                                      &line6pcm->flags) && (fsize > 0))
 249                                 line6_capture_copy(line6pcm, fbuf, fsize);
 250         }
 251
 252         clear_bit(index, &line6pcm->in.active_urbs);
 253
 254         if (test_and_clear_bit(index, &line6pcm->in.unlink_urbs))
 255                 shutdown = 1;
 256
 257         spin_unlock_irqrestore(&line6pcm->in.lock, flags);
 258
 259         if (!shutdown) {
 260                 submit_audio_in_urb(line6pcm);
 261
 262                 if (!(line6pcm->flags & LINE6_BITS_PCM_IMPULSE))
 263                         if (test_bit(LINE6_INDEX_PCM_ALSA_CAPTURE_STREAM,
 264                                      &line6pcm->flags))
 265                                 line6_capture_check_period(line6pcm, length);
 266         }
 267 }
 268
 269 /* open capture callback */
 270 static int snd_line6_capture_open(struct snd_pcm_substream *substream)
 271 {
 272         int err;
 273         struct snd_pcm_runtime *runtime = substream->runtime;
 274         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 275
 276         err = snd_pcm_hw_constraint_ratdens(runtime, 0,
 277                                             SNDRV_PCM_HW_PARAM_RATE,
 278                                             (&line6pcm->
 279                                              properties->snd_line6_rates));
 280         if (err < 0)
 281                 return err;
 282
 283         runtime->hw = line6pcm->properties->snd_line6_capture_hw;
 284         return 0;
 285 }
 286
 287 /* close capture callback */
 288 static int snd_line6_capture_close(struct snd_pcm_substream *substream)
 289 {
 290         return 0;
 291 }
 292
 293 /* hw_params capture callback */
 294 static int snd_line6_capture_hw_params(struct snd_pcm_substream *substream,
 295                                        struct snd_pcm_hw_params *hw_params)
 296 {
 297         int ret;
 298         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 299
 300         ret = line6_pcm_acquire(line6pcm, LINE6_BIT_PCM_ALSA_CAPTURE_BUFFER);
 301
 302         if (ret < 0)
 303                 return ret;
 304
 305         ret = snd_pcm_lib_malloc_pages(substream,
 306                                        params_buffer_bytes(hw_params));
 307         if (ret < 0) {
 308                 line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_CAPTURE_BUFFER);
 309                 return ret;
 310         }
 311
 312         line6pcm->in.period = params_period_bytes(hw_params);
 313         return 0;
 314 }
 315
 316 /* hw_free capture callback */
 317 static int snd_line6_capture_hw_free(struct snd_pcm_substream *substream)
 318 {
 319         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 320
 321         line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_CAPTURE_BUFFER);
 322         return snd_pcm_lib_free_pages(substream);
 323 }
 324
 325 /* trigger callback */
 326 int snd_line6_capture_trigger(struct snd_line6_pcm *line6pcm, int cmd)
 327 {
 328         int err;
 329
 330         switch (cmd) {
 331         case SNDRV_PCM_TRIGGER_START:
 332         case SNDRV_PCM_TRIGGER_RESUME:
 333                 err = line6_pcm_acquire(line6pcm,
 334                                         LINE6_BIT_PCM_ALSA_CAPTURE_STREAM);
 335
 336                 if (err < 0)
 337                         return err;
 338
 339                 break;
 340
 341         case SNDRV_PCM_TRIGGER_STOP:
 342         case SNDRV_PCM_TRIGGER_SUSPEND:
 343                 err = line6_pcm_release(line6pcm,
 344                                         LINE6_BIT_PCM_ALSA_CAPTURE_STREAM);
 345
 346                 if (err < 0)
 347                         return err;
 348
 349                 break;
 350
 351         default:
 352                 return -EINVAL;
 353         }
 354
 355         return 0;
 356 }
 357
 358 /* capture pointer callback */
 359 static snd_pcm_uframes_t
 360 snd_line6_capture_pointer(struct snd_pcm_substream *substream)
 361 {
 362         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 363
 364         return line6pcm->in.pos_done;
 365 }
 366
 367 /* capture operators */
 368 struct snd_pcm_ops snd_line6_capture_ops = {
 369         .open = snd_line6_capture_open,
 370         .close = snd_line6_capture_close,
 371         .ioctl = snd_pcm_lib_ioctl,
 372         .hw_params = snd_line6_capture_hw_params,
 373         .hw_free = snd_line6_capture_hw_free,
 374         .prepare = snd_line6_prepare,
 375         .trigger = snd_line6_trigger,
 376         .pointer = snd_line6_capture_pointer,
 377 };
 378
 379 int line6_create_audio_in_urbs(struct snd_line6_pcm *line6pcm)
 380 {
 381         struct usb_line6 *line6 = line6pcm->line6;
 382         int i;
 383
 384         /* create audio URBs and fill in constant values: */
 385         for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
 386                 struct urb *urb;
 387
 388                 /* URB for audio in: */
 389                 urb = line6pcm->in.urbs[i] =
 390                     usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
 391
 392                 if (urb == NULL)
 393                         return -ENOMEM;
 394
 395                 urb->dev = line6->usbdev;
 396                 urb->pipe =
 397                     usb_rcvisocpipe(line6->usbdev,
 398                                     line6->properties->ep_audio_r &
 399                                     USB_ENDPOINT_NUMBER_MASK);
 400                 urb->transfer_flags = URB_ISO_ASAP;
 401                 urb->start_frame = -1;
 402                 urb->number_of_packets = LINE6_ISO_PACKETS;
 403                 urb->interval = LINE6_ISO_INTERVAL;
 404                 urb->error_count = 0;
 405                 urb->complete = audio_in_callback;
 406         }
 407
 408         return 0;
 409 }