drivers/usb/class/cdc-acm.c

   1 /*
   2  * cdc-acm.c
   3  *
   4  * Copyright (c) 1999 Armin Fuerst      <fuerst@in.tum.de>
   5  * Copyright (c) 1999 Pavel Machek      <pavel@ucw.cz>
   6  * Copyright (c) 1999 Johannes Erdfelt  <johannes@erdfelt.com>
   7  * Copyright (c) 2000 Vojtech Pavlik    <vojtech@suse.cz>
   8  * Copyright (c) 2004 Oliver Neukum     <oliver@neukum.name>
   9  * Copyright (c) 2005 David Kubicek     <dave@awk.cz>
  10  * Copyright (c) 2011 Johan Hovold      <jhovold@gmail.com>
  11  *
  12  * USB Abstract Control Model driver for USB modems and ISDN adapters
  13  *
  14  * Sponsored by SuSE
  15  *
  16  * This program is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License as published by
  18  * the Free Software Foundation; either version 2 of the License, or
  19  * (at your option) any later version.
  20  *
  21  * This program is distributed in the hope that it will be useful,
  22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  * GNU General Public License for more details.
  25  *
  26  * You should have received a copy of the GNU General Public License
  27  * along with this program; if not, write to the Free Software
  28  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  29  */
  30
  31 #undef DEBUG
  32 #undef VERBOSE_DEBUG
  33
  34 #include <linux/kernel.h>
  35 #include <linux/errno.h>
  36 #include <linux/init.h>
  37 #include <linux/slab.h>
  38 #include <linux/tty.h>
  39 #include <linux/serial.h>
  40 #include <linux/tty_driver.h>
  41 #include <linux/tty_flip.h>
  42 #include <linux/module.h>
  43 #include <linux/mutex.h>
  44 #include <linux/uaccess.h>
  45 #include <linux/usb.h>
  46 #include <linux/usb/cdc.h>
  47 #include <asm/byteorder.h>
  48 #include <asm/unaligned.h>
  49 #include <linux/idr.h>
  50 #include <linux/list.h>
  51
  52 #include "cdc-acm.h"
  53
  54
  55 #define DRIVER_AUTHOR "Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik, David Kubicek, Johan Hovold"
  56 #define DRIVER_DESC "USB Abstract Control Model driver for USB modems and ISDN adapters"
  57
  58 static struct usb_driver acm_driver;
  59 static struct tty_driver *acm_tty_driver;
  60
  61 static DEFINE_IDR(acm_minors);
  62 static DEFINE_MUTEX(acm_minors_lock);
  63
  64 static void acm_tty_set_termios(struct tty_struct *tty,
  65                                 struct ktermios *termios_old);
  66
  67 /*
  68  * acm_minors accessors
  69  */
  70
  71 /*
  72  * Look up an ACM structure by minor. If found and not disconnected, increment
  73  * its refcount and return it with its mutex held.
  74  */
  75 static struct acm *acm_get_by_minor(unsigned int minor)
  76 {
  77         struct acm *acm;
  78
  79         mutex_lock(&acm_minors_lock);
  80         acm = idr_find(&acm_minors, minor);
  81         if (acm) {
  82                 mutex_lock(&acm->mutex);
  83                 if (acm->disconnected) {
  84                         mutex_unlock(&acm->mutex);
  85                         acm = NULL;
  86                 } else {
  87                         tty_port_get(&acm->port);
  88                         mutex_unlock(&acm->mutex);
  89                 }
  90         }
  91         mutex_unlock(&acm_minors_lock);
  92         return acm;
  93 }
  94
  95 /*
  96  * Try to find an available minor number and if found, associate it with 'acm'.
  97  */
  98 static int acm_alloc_minor(struct acm *acm)
  99 {
 100         int minor;
 101
 102         mutex_lock(&acm_minors_lock);
 103         minor = idr_alloc(&acm_minors, acm, 0, ACM_TTY_MINORS, GFP_KERNEL);
 104         mutex_unlock(&acm_minors_lock);
 105
 106         return minor;
 107 }
 108
 109 /* Release the minor number associated with 'acm'.  */
 110 static void acm_release_minor(struct acm *acm)
 111 {
 112         mutex_lock(&acm_minors_lock);
 113         idr_remove(&acm_minors, acm->minor);
 114         mutex_unlock(&acm_minors_lock);
 115 }
 116
 117 /*
 118  * Functions for ACM control messages.
 119  */
 120
 121 static int acm_ctrl_msg(struct acm *acm, int request, int value,
 122                                                         void *buf, int len)
 123 {
 124         int retval;
 125
 126         retval = usb_autopm_get_interface(acm->control);
 127         if (retval)
 128                 return retval;
 129
 130         retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
 131                 request, USB_RT_ACM, value,
 132                 acm->control->altsetting[0].desc.bInterfaceNumber,
 133                 buf, len, 5000);
 134
 135         dev_dbg(&acm->control->dev,
 136                         "%s - rq 0x%02x, val %#x, len %#x, result %d\n",
 137                         __func__, request, value, len, retval);
 138
 139         usb_autopm_put_interface(acm->control);
 140
 141         return retval < 0 ? retval : 0;
 142 }
 143
 144 /* devices aren't required to support these requests.
 145  * the cdc acm descriptor tells whether they do...
 146  */
 147 static inline int acm_set_control(struct acm *acm, int control)
 148 {
 149         if (acm->quirks & QUIRK_CONTROL_LINE_STATE)
 150                 return -EOPNOTSUPP;
 151
 152         return acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE,
 153                         control, NULL, 0);
 154 }
 155
 156 #define acm_set_line(acm, line) \
 157         acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
 158 #define acm_send_break(acm, ms) \
 159         acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)
 160
 161 /*
 162  * Write buffer management.
 163  * All of these assume proper locks taken by the caller.
 164  */
 165
 166 static int acm_wb_alloc(struct acm *acm)
 167 {
 168         int i, wbn;
 169         struct acm_wb *wb;
 170
 171         wbn = 0;
 172         i = 0;
 173         for (;;) {
 174                 wb = &acm->wb[wbn];
 175                 if (!wb->use) {
 176                         wb->use = 1;
 177                         return wbn;
 178                 }
 179                 wbn = (wbn + 1) % ACM_NW;
 180                 if (++i >= ACM_NW)
 181                         return -1;
 182         }
 183 }
 184
 185 static int acm_wb_is_avail(struct acm *acm)
 186 {
 187         int i, n;
 188         unsigned long flags;
 189
 190         n = ACM_NW;
 191         spin_lock_irqsave(&acm->write_lock, flags);
 192         for (i = 0; i < ACM_NW; i++)
 193                 n -= acm->wb[i].use;
 194         spin_unlock_irqrestore(&acm->write_lock, flags);
 195         return n;
 196 }
 197
 198 /*
 199  * Finish write. Caller must hold acm->write_lock
 200  */
 201 static void acm_write_done(struct acm *acm, struct acm_wb *wb)
 202 {
 203         wb->use = 0;
 204         acm->transmitting--;
 205         usb_autopm_put_interface_async(acm->control);
 206 }
 207
 208 /*
 209  * Poke write.
 210  *
 211  * the caller is responsible for locking
 212  */
 213
 214 static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
 215 {
 216         int rc;
 217
 218         acm->transmitting++;
 219
 220         wb->urb->transfer_buffer = wb->buf;
 221         wb->urb->transfer_dma = wb->dmah;
 222         wb->urb->transfer_buffer_length = wb->len;
 223         wb->urb->dev = acm->dev;
 224
 225         rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
 226         if (rc < 0) {
 227                 dev_err(&acm->data->dev,
 228                         "%s - usb_submit_urb(write bulk) failed: %d\n",
 229                         __func__, rc);
 230                 acm_write_done(acm, wb);
 231         }
 232         return rc;
 233 }
 234
 235 /*
 236  * attributes exported through sysfs
 237  */
 238 static ssize_t show_caps
 239 (struct device *dev, struct device_attribute *attr, char *buf)
 240 {
 241         struct usb_interface *intf = to_usb_interface(dev);
 242         struct acm *acm = usb_get_intfdata(intf);
 243
 244         return sprintf(buf, "%d", acm->ctrl_caps);
 245 }
 246 static DEVICE_ATTR(bmCapabilities, S_IRUGO, show_caps, NULL);
 247
 248 static ssize_t show_country_codes
 249 (struct device *dev, struct device_attribute *attr, char *buf)
 250 {
 251         struct usb_interface *intf = to_usb_interface(dev);
 252         struct acm *acm = usb_get_intfdata(intf);
 253
 254         memcpy(buf, acm->country_codes, acm->country_code_size);
 255         return acm->country_code_size;
 256 }
 257
 258 static DEVICE_ATTR(wCountryCodes, S_IRUGO, show_country_codes, NULL);
 259
 260 static ssize_t show_country_rel_date
 261 (struct device *dev, struct device_attribute *attr, char *buf)
 262 {
 263         struct usb_interface *intf = to_usb_interface(dev);
 264         struct acm *acm = usb_get_intfdata(intf);
 265
 266         return sprintf(buf, "%d", acm->country_rel_date);
 267 }
 268
 269 static DEVICE_ATTR(iCountryCodeRelDate, S_IRUGO, show_country_rel_date, NULL);
 270 /*
 271  * Interrupt handlers for various ACM device responses
 272  */
 273
 274 /* control interface reports status changes with "interrupt" transfers */
 275 static void acm_ctrl_irq(struct urb *urb)
 276 {
 277         struct acm *acm = urb->context;
 278         struct usb_cdc_notification *dr = urb->transfer_buffer;
 279         unsigned char *data;
 280         int newctrl;
 281         int difference;
 282         int retval;
 283         int status = urb->status;
 284
 285         switch (status) {
 286         case 0:
 287                 /* success */
 288                 break;
 289         case -ECONNRESET:
 290         case -ENOENT:
 291         case -ESHUTDOWN:
 292                 /* this urb is terminated, clean up */
 293                 dev_dbg(&acm->control->dev,
 294                                 "%s - urb shutting down with status: %d\n",
 295                                 __func__, status);
 296                 return;
 297         default:
 298                 dev_dbg(&acm->control->dev,
 299                                 "%s - nonzero urb status received: %d\n",
 300                                 __func__, status);
 301                 goto exit;
 302         }
 303
 304         usb_mark_last_busy(acm->dev);
 305
 306         data = (unsigned char *)(dr + 1);
 307         switch (dr->bNotificationType) {
 308         case USB_CDC_NOTIFY_NETWORK_CONNECTION:
 309                 dev_dbg(&acm->control->dev, "%s - network connection: %d\n",
 310                                                         __func__, dr->wValue);
 311                 break;
 312
 313         case USB_CDC_NOTIFY_SERIAL_STATE:
 314                 if (le16_to_cpu(dr->wLength) != 2) {
 315                         dev_dbg(&acm->control->dev,
 316                                 "%s - malformed serial state\n", __func__);
 317                         break;
 318                 }
 319
 320                 newctrl = get_unaligned_le16(data);
 321
 322                 if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
 323                         dev_dbg(&acm->control->dev, "%s - calling hangup\n",
 324                                         __func__);
 325                         tty_port_tty_hangup(&acm->port, false);
 326                 }
 327
 328                 difference = acm->ctrlin ^ newctrl;
 329                 spin_lock(&acm->read_lock);
 330                 acm->ctrlin = newctrl;
 331                 acm->oldcount = acm->iocount;
 332
 333                 if (difference & ACM_CTRL_DSR)
 334                         acm->iocount.dsr++;
 335                 if (difference & ACM_CTRL_BRK)
 336                         acm->iocount.brk++;
 337                 if (difference & ACM_CTRL_RI)
 338                         acm->iocount.rng++;
 339                 if (difference & ACM_CTRL_DCD)
 340                         acm->iocount.dcd++;
 341                 if (difference & ACM_CTRL_FRAMING)
 342                         acm->iocount.frame++;
 343                 if (difference & ACM_CTRL_PARITY)
 344                         acm->iocount.parity++;
 345                 if (difference & ACM_CTRL_OVERRUN)
 346                         acm->iocount.overrun++;
 347                 spin_unlock(&acm->read_lock);
 348
 349                 if (difference)
 350                         wake_up_all(&acm->wioctl);
 351
 352                 break;
 353
 354         default:
 355                 dev_dbg(&acm->control->dev,
 356                         "%s - unknown notification %d received: index %d len %d\n",
 357                         __func__,
 358                         dr->bNotificationType, dr->wIndex, dr->wLength);
 359
 360                 break;
 361         }
 362 exit:
 363         retval = usb_submit_urb(urb, GFP_ATOMIC);
 364         if (retval && retval != -EPERM)
 365                 dev_err(&acm->control->dev, "%s - usb_submit_urb failed: %d\n",
 366                                                         __func__, retval);
 367 }
 368
 369 static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
 370 {
 371         int res;
 372
 373         if (!test_and_clear_bit(index, &acm->read_urbs_free))
 374                 return 0;
 375
 376         res = usb_submit_urb(acm->read_urbs[index], mem_flags);
 377         if (res) {
 378                 if (res != -EPERM && res != -ENODEV) {
 379                         dev_err(&acm->data->dev,
 380                                         "urb %d failed submission with %d\n",
 381                                         index, res);
 382                 }
 383                 set_bit(index, &acm->read_urbs_free);
 384                 return res;
 385         } else {
 386                 dev_vdbg(&acm->data->dev, "submitted urb %d\n", index);
 387         }
 388
 389         return 0;
 390 }
 391
 392 static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
 393 {
 394         int res;
 395         int i;
 396
 397         for (i = 0; i < acm->rx_buflimit; ++i) {
 398                 res = acm_submit_read_urb(acm, i, mem_flags);
 399                 if (res)
 400                         return res;
 401         }
 402
 403         return 0;
 404 }
 405
 406 static void acm_process_read_urb(struct acm *acm, struct urb *urb)
 407 {
 408         if (!urb->actual_length)
 409                 return;
 410
 411         tty_insert_flip_string(&acm->port, urb->transfer_buffer,
 412                         urb->actual_length);
 413         tty_flip_buffer_push(&acm->port);
 414 }
 415
 416 static void acm_read_bulk_callback(struct urb *urb)
 417 {
 418         struct acm_rb *rb = urb->context;
 419         struct acm *acm = rb->instance;
 420         unsigned long flags;
 421         int status = urb->status;
 422
 423         dev_vdbg(&acm->data->dev, "got urb %d, len %d, status %d\n",
 424                                         rb->index, urb->actual_length,
 425                                         status);
 426
 427         if (!acm->dev) {
 428                 set_bit(rb->index, &acm->read_urbs_free);
 429                 dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
 430                 return;
 431         }
 432
 433         if (status) {
 434                 set_bit(rb->index, &acm->read_urbs_free);
 435                 if ((status != -ENOENT) || (urb->actual_length == 0))
 436                         return;
 437         }
 438
 439         usb_mark_last_busy(acm->dev);
 440
 441         acm_process_read_urb(acm, urb);
 442         /*
 443          * Unthrottle may run on another CPU which needs to see events
 444          * in the same order. Submission has an implict barrier
 445          */
 446         smp_mb__before_atomic();
 447         set_bit(rb->index, &acm->read_urbs_free);
 448
 449         /* throttle device if requested by tty */
 450         spin_lock_irqsave(&acm->read_lock, flags);
 451         acm->throttled = acm->throttle_req;
 452         if (!acm->throttled) {
 453                 spin_unlock_irqrestore(&acm->read_lock, flags);
 454                 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
 455         } else {
 456                 spin_unlock_irqrestore(&acm->read_lock, flags);
 457         }
 458 }
 459
 460 /* data interface wrote those outgoing bytes */
 461 static void acm_write_bulk(struct urb *urb)
 462 {
 463         struct acm_wb *wb = urb->context;
 464         struct acm *acm = wb->instance;
 465         unsigned long flags;
 466         int status = urb->status;
 467
 468         if (status || (urb->actual_length != urb->transfer_buffer_length))
 469                 dev_vdbg(&acm->data->dev, "wrote len %d/%d, status %d\n",
 470                         urb->actual_length,
 471                         urb->transfer_buffer_length,
 472                         status);
 473
 474         spin_lock_irqsave(&acm->write_lock, flags);
 475         acm_write_done(acm, wb);
 476         spin_unlock_irqrestore(&acm->write_lock, flags);
 477         schedule_work(&acm->work);
 478 }
 479
 480 static void acm_softint(struct work_struct *work)
 481 {
 482         struct acm *acm = container_of(work, struct acm, work);
 483
 484         tty_port_tty_wakeup(&acm->port);
 485 }
 486
 487 /*
 488  * TTY handlers
 489  */
 490
 491 static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
 492 {
 493         struct acm *acm;
 494         int retval;
 495
 496         acm = acm_get_by_minor(tty->index);
 497         if (!acm)
 498                 return -ENODEV;
 499
 500         retval = tty_standard_install(driver, tty);
 501         if (retval)
 502                 goto error_init_termios;
 503
 504         tty->driver_data = acm;
 505
 506         return 0;
 507
 508 error_init_termios:
 509         tty_port_put(&acm->port);
 510         return retval;
 511 }
 512
 513 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
 514 {
 515         struct acm *acm = tty->driver_data;
 516
 517         return tty_port_open(&acm->port, tty, filp);
 518 }
 519
 520 static void acm_port_dtr_rts(struct tty_port *port, int raise)
 521 {
 522         struct acm *acm = container_of(port, struct acm, port);
 523         int val;
 524         int res;
 525
 526         if (raise)
 527                 val = ACM_CTRL_DTR | ACM_CTRL_RTS;
 528         else
 529                 val = 0;
 530
 531         /* FIXME: add missing ctrlout locking throughout driver */
 532         acm->ctrlout = val;
 533
 534         res = acm_set_control(acm, val);
 535         if (res && (acm->ctrl_caps & USB_CDC_CAP_LINE))
 536                 dev_err(&acm->control->dev, "failed to set dtr/rts\n");
 537 }
 538
 539 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
 540 {
 541         struct acm *acm = container_of(port, struct acm, port);
 542         int retval = -ENODEV;
 543         int i;
 544
 545         mutex_lock(&acm->mutex);
 546         if (acm->disconnected)
 547                 goto disconnected;
 548
 549         retval = usb_autopm_get_interface(acm->control);
 550         if (retval)
 551                 goto error_get_interface;
 552
 553         /*
 554          * FIXME: Why do we need this? Allocating 64K of physically contiguous
 555          * memory is really nasty...
 556          */
 557         set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
 558         acm->control->needs_remote_wakeup = 1;
 559
 560         acm->ctrlurb->dev = acm->dev;
 561         retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
 562         if (retval) {
 563                 dev_err(&acm->control->dev,
 564                         "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
 565                 goto error_submit_urb;
 566         }
 567
 568         acm_tty_set_termios(tty, NULL);
 569
 570         /*
 571          * Unthrottle device in case the TTY was closed while throttled.
 572          */
 573         spin_lock_irq(&acm->read_lock);
 574         acm->throttled = 0;
 575         acm->throttle_req = 0;
 576         spin_unlock_irq(&acm->read_lock);
 577
 578         retval = acm_submit_read_urbs(acm, GFP_KERNEL);
 579         if (retval)
 580                 goto error_submit_read_urbs;
 581
 582         usb_autopm_put_interface(acm->control);
 583
 584         mutex_unlock(&acm->mutex);
 585
 586         return 0;
 587
 588 error_submit_read_urbs:
 589         for (i = 0; i < acm->rx_buflimit; i++)
 590                 usb_kill_urb(acm->read_urbs[i]);
 591         usb_kill_urb(acm->ctrlurb);
 592 error_submit_urb:
 593         usb_autopm_put_interface(acm->control);
 594 error_get_interface:
 595 disconnected:
 596         mutex_unlock(&acm->mutex);
 597
 598         return usb_translate_errors(retval);
 599 }
 600
 601 static void acm_port_destruct(struct tty_port *port)
 602 {
 603         struct acm *acm = container_of(port, struct acm, port);
 604
 605         acm_release_minor(acm);
 606         usb_put_intf(acm->control);
 607         kfree(acm->country_codes);
 608         kfree(acm);
 609 }
 610
 611 static void acm_port_shutdown(struct tty_port *port)
 612 {
 613         struct acm *acm = container_of(port, struct acm, port);
 614         struct urb *urb;
 615         struct acm_wb *wb;
 616         int i;
 617
 618         /*
 619          * Need to grab write_lock to prevent race with resume, but no need to
 620          * hold it due to the tty-port initialised flag.
 621          */
 622         spin_lock_irq(&acm->write_lock);
 623         spin_unlock_irq(&acm->write_lock);
 624
 625         usb_autopm_get_interface_no_resume(acm->control);
 626         acm->control->needs_remote_wakeup = 0;
 627         usb_autopm_put_interface(acm->control);
 628
 629         for (;;) {
 630                 urb = usb_get_from_anchor(&acm->delayed);
 631                 if (!urb)
 632                         break;
 633                 wb = urb->context;
 634                 wb->use = 0;
 635                 usb_autopm_put_interface_async(acm->control);
 636         }
 637
 638         usb_kill_urb(acm->ctrlurb);
 639         for (i = 0; i < ACM_NW; i++)
 640                 usb_kill_urb(acm->wb[i].urb);
 641         for (i = 0; i < acm->rx_buflimit; i++)
 642                 usb_kill_urb(acm->read_urbs[i]);
 643 }
 644
 645 static void acm_tty_cleanup(struct tty_struct *tty)
 646 {
 647         struct acm *acm = tty->driver_data;
 648
 649         tty_port_put(&acm->port);
 650 }
 651
 652 static void acm_tty_hangup(struct tty_struct *tty)
 653 {
 654         struct acm *acm = tty->driver_data;
 655
 656         tty_port_hangup(&acm->port);
 657 }
 658
 659 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
 660 {
 661         struct acm *acm = tty->driver_data;
 662
 663         tty_port_close(&acm->port, tty, filp);
 664 }
 665
 666 static int acm_tty_write(struct tty_struct *tty,
 667                                         const unsigned char *buf, int count)
 668 {
 669         struct acm *acm = tty->driver_data;
 670         int stat;
 671         unsigned long flags;
 672         int wbn;
 673         struct acm_wb *wb;
 674
 675         if (!count)
 676                 return 0;
 677
 678         dev_vdbg(&acm->data->dev, "%d bytes from tty layer\n", count);
 679
 680         spin_lock_irqsave(&acm->write_lock, flags);
 681         wbn = acm_wb_alloc(acm);
 682         if (wbn < 0) {
 683                 spin_unlock_irqrestore(&acm->write_lock, flags);
 684                 return 0;
 685         }
 686         wb = &acm->wb[wbn];
 687
 688         if (!acm->dev) {
 689                 wb->use = 0;
 690                 spin_unlock_irqrestore(&acm->write_lock, flags);
 691                 return -ENODEV;
 692         }
 693
 694         count = (count > acm->writesize) ? acm->writesize : count;
 695         dev_vdbg(&acm->data->dev, "writing %d bytes\n", count);
 696         memcpy(wb->buf, buf, count);
 697         wb->len = count;
 698
 699         stat = usb_autopm_get_interface_async(acm->control);
 700         if (stat) {
 701                 wb->use = 0;
 702                 spin_unlock_irqrestore(&acm->write_lock, flags);
 703                 return stat;
 704         }
 705
 706         if (acm->susp_count) {
 707                 if (acm->putbuffer) {
 708                         /* now to preserve order */
 709                         usb_anchor_urb(acm->putbuffer->urb, &acm->delayed);
 710                         acm->putbuffer = NULL;
 711                 }
 712                 usb_anchor_urb(wb->urb, &acm->delayed);
 713                 spin_unlock_irqrestore(&acm->write_lock, flags);
 714                 return count;
 715         } else {
 716                 if (acm->putbuffer) {
 717                         /* at this point there is no good way to handle errors */
 718                         acm_start_wb(acm, acm->putbuffer);
 719                         acm->putbuffer = NULL;
 720                 }
 721         }
 722
 723         stat = acm_start_wb(acm, wb);
 724         spin_unlock_irqrestore(&acm->write_lock, flags);
 725
 726         if (stat < 0)
 727                 return stat;
 728         return count;
 729 }
 730
 731 static void acm_tty_flush_chars(struct tty_struct *tty)
 732 {
 733         struct acm *acm = tty->driver_data;
 734         struct acm_wb *cur = acm->putbuffer;
 735         int err;
 736         unsigned long flags;
 737
 738         if (!cur) /* nothing to do */
 739                 return;
 740
 741         acm->putbuffer = NULL;
 742         err = usb_autopm_get_interface_async(acm->control);
 743         spin_lock_irqsave(&acm->write_lock, flags);
 744         if (err < 0) {
 745                 cur->use = 0;
 746                 acm->putbuffer = cur;
 747                 goto out;
 748         }
 749
 750         if (acm->susp_count)
 751                 usb_anchor_urb(cur->urb, &acm->delayed);
 752         else
 753                 acm_start_wb(acm, cur);
 754 out:
 755         spin_unlock_irqrestore(&acm->write_lock, flags);
 756         return;
 757 }
 758
 759 static int acm_tty_put_char(struct tty_struct *tty, unsigned char ch)
 760 {
 761         struct acm *acm = tty->driver_data;
 762         struct acm_wb *cur;
 763         int wbn;
 764         unsigned long flags;
 765
 766 overflow:
 767         cur = acm->putbuffer;
 768         if (!cur) {
 769                 spin_lock_irqsave(&acm->write_lock, flags);
 770                 wbn = acm_wb_alloc(acm);
 771                 if (wbn >= 0) {
 772                         cur = &acm->wb[wbn];
 773                         acm->putbuffer = cur;
 774                 }
 775                 spin_unlock_irqrestore(&acm->write_lock, flags);
 776                 if (!cur)
 777                         return 0;
 778         }
 779
 780         if (cur->len == acm->writesize) {
 781                 acm_tty_flush_chars(tty);
 782                 goto overflow;
 783         }
 784
 785         cur->buf[cur->len++] = ch;
 786         return 1;
 787 }
 788
 789 static int acm_tty_write_room(struct tty_struct *tty)
 790 {
 791         struct acm *acm = tty->driver_data;
 792         /*
 793          * Do not let the line discipline to know that we have a reserve,
 794          * or it might get too enthusiastic.
 795          */
 796         return acm_wb_is_avail(acm) ? acm->writesize : 0;
 797 }
 798
 799 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
 800 {
 801         struct acm *acm = tty->driver_data;
 802         /*
 803          * if the device was unplugged then any remaining characters fell out
 804          * of the connector ;)
 805          */
 806         if (acm->disconnected)
 807                 return 0;
 808         /*
 809          * This is inaccurate (overcounts), but it works.
 810          */
 811         return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
 812 }
 813
 814 static void acm_tty_throttle(struct tty_struct *tty)
 815 {
 816         struct acm *acm = tty->driver_data;
 817
 818         spin_lock_irq(&acm->read_lock);
 819         acm->throttle_req = 1;
 820         spin_unlock_irq(&acm->read_lock);
 821 }
 822
 823 static void acm_tty_unthrottle(struct tty_struct *tty)
 824 {
 825         struct acm *acm = tty->driver_data;
 826         unsigned int was_throttled;
 827
 828         spin_lock_irq(&acm->read_lock);
 829         was_throttled = acm->throttled;
 830         acm->throttled = 0;
 831         acm->throttle_req = 0;
 832         spin_unlock_irq(&acm->read_lock);
 833
 834         if (was_throttled)
 835                 acm_submit_read_urbs(acm, GFP_KERNEL);
 836 }
 837
 838 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
 839 {
 840         struct acm *acm = tty->driver_data;
 841         int retval;
 842
 843         retval = acm_send_break(acm, state ? 0xffff : 0);
 844         if (retval < 0)
 845                 dev_dbg(&acm->control->dev, "%s - send break failed\n",
 846                                                                 __func__);
 847         return retval;
 848 }
 849
 850 static int acm_tty_tiocmget(struct tty_struct *tty)
 851 {
 852         struct acm *acm = tty->driver_data;
 853
 854         return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
 855                (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
 856                (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
 857                (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
 858                (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
 859                TIOCM_CTS;
 860 }
 861
 862 static int acm_tty_tiocmset(struct tty_struct *tty,
 863                             unsigned int set, unsigned int clear)
 864 {
 865         struct acm *acm = tty->driver_data;
 866         unsigned int newctrl;
 867
 868         newctrl = acm->ctrlout;
 869         set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 870                                         (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 871         clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 872                                         (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 873
 874         newctrl = (newctrl & ~clear) | set;
 875
 876         if (acm->ctrlout == newctrl)
 877                 return 0;
 878         return acm_set_control(acm, acm->ctrlout = newctrl);
 879 }
 880
 881 static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
 882 {
 883         struct serial_struct tmp;
 884
 885         if (!info)
 886                 return -EINVAL;
 887
 888         memset(&tmp, 0, sizeof(tmp));
 889         tmp.flags = ASYNC_LOW_LATENCY;
 890         tmp.xmit_fifo_size = acm->writesize;
 891         tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
 892         tmp.close_delay = acm->port.close_delay / 10;
 893         tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 894                                 ASYNC_CLOSING_WAIT_NONE :
 895                                 acm->port.closing_wait / 10;
 896
 897         if (copy_to_user(info, &tmp, sizeof(tmp)))
 898                 return -EFAULT;
 899         else
 900                 return 0;
 901 }
 902
 903 static int set_serial_info(struct acm *acm,
 904                                 struct serial_struct __user *newinfo)
 905 {
 906         struct serial_struct new_serial;
 907         unsigned int closing_wait, close_delay;
 908         int retval = 0;
 909
 910         if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
 911                 return -EFAULT;
 912
 913         close_delay = new_serial.close_delay * 10;
 914         closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 915                         ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
 916
 917         mutex_lock(&acm->port.mutex);
 918
 919         if (!capable(CAP_SYS_ADMIN)) {
 920                 if ((close_delay != acm->port.close_delay) ||
 921                     (closing_wait != acm->port.closing_wait))
 922                         retval = -EPERM;
 923                 else
 924                         retval = -EOPNOTSUPP;
 925         } else {
 926                 acm->port.close_delay  = close_delay;
 927                 acm->port.closing_wait = closing_wait;
 928         }
 929
 930         mutex_unlock(&acm->port.mutex);
 931         return retval;
 932 }
 933
 934 static int wait_serial_change(struct acm *acm, unsigned long arg)
 935 {
 936         int rv = 0;
 937         DECLARE_WAITQUEUE(wait, current);
 938         struct async_icount old, new;
 939
 940         do {
 941                 spin_lock_irq(&acm->read_lock);
 942                 old = acm->oldcount;
 943                 new = acm->iocount;
 944                 acm->oldcount = new;
 945                 spin_unlock_irq(&acm->read_lock);
 946
 947                 if ((arg & TIOCM_DSR) &&
 948                         old.dsr != new.dsr)
 949                         break;
 950                 if ((arg & TIOCM_CD)  &&
 951                         old.dcd != new.dcd)
 952                         break;
 953                 if ((arg & TIOCM_RI) &&
 954                         old.rng != new.rng)
 955                         break;
 956
 957                 add_wait_queue(&acm->wioctl, &wait);
 958                 set_current_state(TASK_INTERRUPTIBLE);
 959                 schedule();
 960                 remove_wait_queue(&acm->wioctl, &wait);
 961                 if (acm->disconnected) {
 962                         if (arg & TIOCM_CD)
 963                                 break;
 964                         else
 965                                 rv = -ENODEV;
 966                 } else {
 967                         if (signal_pending(current))
 968                                 rv = -ERESTARTSYS;
 969                 }
 970         } while (!rv);
 971
 972
 973
 974         return rv;
 975 }
 976
 977 static int get_serial_usage(struct acm *acm,
 978                             struct serial_icounter_struct __user *count)
 979 {
 980         struct serial_icounter_struct icount;
 981         int rv = 0;
 982
 983         memset(&icount, 0, sizeof(icount));
 984         icount.dsr = acm->iocount.dsr;
 985         icount.rng = acm->iocount.rng;
 986         icount.dcd = acm->iocount.dcd;
 987         icount.frame = acm->iocount.frame;
 988         icount.overrun = acm->iocount.overrun;
 989         icount.parity = acm->iocount.parity;
 990         icount.brk = acm->iocount.brk;
 991
 992         if (copy_to_user(count, &icount, sizeof(icount)) > 0)
 993                 rv = -EFAULT;
 994
 995         return rv;
 996 }
 997
 998 static int acm_tty_ioctl(struct tty_struct *tty,
 999                                         unsigned int cmd, unsigned long arg)
1000 {
1001         struct acm *acm = tty->driver_data;
1002         int rv = -ENOIOCTLCMD;
1003
1004         switch (cmd) {
1005         case TIOCGSERIAL: /* gets serial port data */
1006                 rv = get_serial_info(acm, (struct serial_struct __user *) arg);
1007                 break;
1008         case TIOCSSERIAL:
1009                 rv = set_serial_info(acm, (struct serial_struct __user *) arg);
1010                 break;
1011         case TIOCMIWAIT:
1012                 rv = usb_autopm_get_interface(acm->control);
1013                 if (rv < 0) {
1014                         rv = -EIO;
1015                         break;
1016                 }
1017                 rv = wait_serial_change(acm, arg);
1018                 usb_autopm_put_interface(acm->control);
1019                 break;
1020         case TIOCGICOUNT:
1021                 rv = get_serial_usage(acm, (struct serial_icounter_struct __user *) arg);
1022                 break;
1023         }
1024
1025         return rv;
1026 }
1027
1028 static void acm_tty_set_termios(struct tty_struct *tty,
1029                                                 struct ktermios *termios_old)
1030 {
1031         struct acm *acm = tty->driver_data;
1032         struct ktermios *termios = &tty->termios;
1033         struct usb_cdc_line_coding newline;
1034         int newctrl = acm->ctrlout;
1035
1036         newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
1037         newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
1038         newline.bParityType = termios->c_cflag & PARENB ?
1039                                 (termios->c_cflag & PARODD ? 1 : 2) +
1040                                 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
1041         switch (termios->c_cflag & CSIZE) {
1042         case CS5:
1043                 newline.bDataBits = 5;
1044                 break;
1045         case CS6:
1046                 newline.bDataBits = 6;
1047                 break;
1048         case CS7:
1049                 newline.bDataBits = 7;
1050                 break;
1051         case CS8:
1052         default:
1053                 newline.bDataBits = 8;
1054                 break;
1055         }
1056         /* FIXME: Needs to clear unsupported bits in the termios */
1057         acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
1058
1059         if (C_BAUD(tty) == B0) {
1060                 newline.dwDTERate = acm->line.dwDTERate;
1061                 newctrl &= ~ACM_CTRL_DTR;
1062         } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
1063                 newctrl |=  ACM_CTRL_DTR;
1064         }
1065
1066         if (newctrl != acm->ctrlout)
1067                 acm_set_control(acm, acm->ctrlout = newctrl);
1068
1069         if (memcmp(&acm->line, &newline, sizeof newline)) {
1070                 memcpy(&acm->line, &newline, sizeof newline);
1071                 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
1072                         __func__,
1073                         le32_to_cpu(newline.dwDTERate),
1074                         newline.bCharFormat, newline.bParityType,
1075                         newline.bDataBits);
1076                 acm_set_line(acm, &acm->line);
1077         }
1078 }
1079
1080 static const struct tty_port_operations acm_port_ops = {
1081         .dtr_rts = acm_port_dtr_rts,
1082         .shutdown = acm_port_shutdown,
1083         .activate = acm_port_activate,
1084         .destruct = acm_port_destruct,
1085 };
1086
1087 /*
1088  * USB probe and disconnect routines.
1089  */
1090
1091 /* Little helpers: write/read buffers free */
1092 static void acm_write_buffers_free(struct acm *acm)
1093 {
1094         int i;
1095         struct acm_wb *wb;
1096         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
1097
1098         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1099                 usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah);
1100 }
1101
1102 static void acm_read_buffers_free(struct acm *acm)
1103 {
1104         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
1105         int i;
1106
1107         for (i = 0; i < acm->rx_buflimit; i++)
1108                 usb_free_coherent(usb_dev, acm->readsize,
1109                           acm->read_buffers[i].base, acm->read_buffers[i].dma);
1110 }
1111
1112 /* Little helper: write buffers allocate */
1113 static int acm_write_buffers_alloc(struct acm *acm)
1114 {
1115         int i;
1116         struct acm_wb *wb;
1117
1118         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1119                 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1120                     &wb->dmah);
1121                 if (!wb->buf) {
1122                         while (i != 0) {
1123                                 --i;
1124                                 --wb;
1125                                 usb_free_coherent(acm->dev, acm->writesize,
1126                                     wb->buf, wb->dmah);
1127                         }
1128                         return -ENOMEM;
1129                 }
1130         }
1131         return 0;
1132 }
1133
1134 static int acm_probe(struct usb_interface *intf,
1135                      const struct usb_device_id *id)
1136 {
1137         struct usb_cdc_union_desc *union_header = NULL;
1138         struct usb_cdc_call_mgmt_descriptor *cmgmd = NULL;
1139         unsigned char *buffer = intf->altsetting->extra;
1140         int buflen = intf->altsetting->extralen;
1141         struct usb_interface *control_interface;
1142         struct usb_interface *data_interface;
1143         struct usb_endpoint_descriptor *epctrl = NULL;
1144         struct usb_endpoint_descriptor *epread = NULL;
1145         struct usb_endpoint_descriptor *epwrite = NULL;
1146         struct usb_device *usb_dev = interface_to_usbdev(intf);
1147         struct usb_cdc_parsed_header h;
1148         struct acm *acm;
1149         int minor;
1150         int ctrlsize, readsize;
1151         u8 *buf;
1152         int call_intf_num = -1;
1153         int data_intf_num = -1;
1154         unsigned long quirks;
1155         int num_rx_buf;
1156         int i;
1157         int combined_interfaces = 0;
1158         struct device *tty_dev;
1159         int rv = -ENOMEM;
1160
1161         /* normal quirks */
1162         quirks = (unsigned long)id->driver_info;
1163
1164         if (quirks == IGNORE_DEVICE)
1165                 return -ENODEV;
1166
1167         memset(&h, 0x00, sizeof(struct usb_cdc_parsed_header));
1168
1169         num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1170
1171         /* handle quirks deadly to normal probing*/
1172         if (quirks == NO_UNION_NORMAL) {
1173                 data_interface = usb_ifnum_to_if(usb_dev, 1);
1174                 control_interface = usb_ifnum_to_if(usb_dev, 0);
1175                 /* we would crash */
1176                 if (!data_interface || !control_interface)
1177                         return -ENODEV;
1178                 goto skip_normal_probe;
1179         }
1180
1181         /* normal probing*/
1182         if (!buffer) {
1183                 dev_err(&intf->dev, "Weird descriptor references\n");
1184                 return -EINVAL;
1185         }
1186
1187         if (!intf->cur_altsetting)
1188                 return -EINVAL;
1189
1190         if (!buflen) {
1191                 if (intf->cur_altsetting->endpoint &&
1192                                 intf->cur_altsetting->endpoint->extralen &&
1193                                 intf->cur_altsetting->endpoint->extra) {
1194                         dev_dbg(&intf->dev,
1195                                 "Seeking extra descriptors on endpoint\n");
1196                         buflen = intf->cur_altsetting->endpoint->extralen;
1197                         buffer = intf->cur_altsetting->endpoint->extra;
1198                 } else {
1199                         dev_err(&intf->dev,
1200                                 "Zero length descriptor references\n");
1201                         return -EINVAL;
1202                 }
1203         }
1204
1205         cdc_parse_cdc_header(&h, intf, buffer, buflen);
1206         union_header = h.usb_cdc_union_desc;
1207         cmgmd = h.usb_cdc_call_mgmt_descriptor;
1208         if (cmgmd)
1209                 call_intf_num = cmgmd->bDataInterface;
1210
1211         if (!union_header) {
1212                 if (call_intf_num > 0) {
1213                         dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1214                         /* quirks for Droids MuIn LCD */
1215                         if (quirks & NO_DATA_INTERFACE) {
1216                                 data_interface = usb_ifnum_to_if(usb_dev, 0);
1217                         } else {
1218                                 data_intf_num = call_intf_num;
1219                                 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1220                         }
1221                         control_interface = intf;
1222                 } else {
1223                         if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1224                                 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1225                                 return -ENODEV;
1226                         } else {
1227                                 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1228                                 combined_interfaces = 1;
1229                                 control_interface = data_interface = intf;
1230                                 goto look_for_collapsed_interface;
1231                         }
1232                 }
1233         } else {
1234                 data_intf_num = union_header->bSlaveInterface0;
1235                 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1236                 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1237         }
1238
1239         if (!control_interface || !data_interface) {
1240                 dev_dbg(&intf->dev, "no interfaces\n");
1241                 return -ENODEV;
1242         }
1243         if (!data_interface->cur_altsetting || !control_interface->cur_altsetting)
1244                 return -ENODEV;
1245
1246         if (data_intf_num != call_intf_num)
1247                 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1248
1249         if (control_interface == data_interface) {
1250                 /* some broken devices designed for windows work this way */
1251                 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1252                 combined_interfaces = 1;
1253                 /* a popular other OS doesn't use it */
1254                 quirks |= NO_CAP_LINE;
1255                 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1256                         dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1257                         return -EINVAL;
1258                 }
1259 look_for_collapsed_interface:
1260                 for (i = 0; i < 3; i++) {
1261                         struct usb_endpoint_descriptor *ep;
1262                         ep = &data_interface->cur_altsetting->endpoint[i].desc;
1263
1264                         if (usb_endpoint_is_int_in(ep))
1265                                 epctrl = ep;
1266                         else if (usb_endpoint_is_bulk_out(ep))
1267                                 epwrite = ep;
1268                         else if (usb_endpoint_is_bulk_in(ep))
1269                                 epread = ep;
1270                         else
1271                                 return -EINVAL;
1272                 }
1273                 if (!epctrl || !epread || !epwrite)
1274                         return -ENODEV;
1275                 else
1276                         goto made_compressed_probe;
1277         }
1278
1279 skip_normal_probe:
1280
1281         /*workaround for switched interfaces */
1282         if (data_interface->cur_altsetting->desc.bInterfaceClass
1283                                                 != CDC_DATA_INTERFACE_TYPE) {
1284                 if (control_interface->cur_altsetting->desc.bInterfaceClass
1285                                                 == CDC_DATA_INTERFACE_TYPE) {
1286                         dev_dbg(&intf->dev,
1287                                 "Your device has switched interfaces.\n");
1288                         swap(control_interface, data_interface);
1289                 } else {
1290                         return -EINVAL;
1291                 }
1292         }
1293
1294         /* Accept probe requests only for the control interface */
1295         if (!combined_interfaces && intf != control_interface)
1296                 return -ENODEV;
1297
1298         if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1299                 /* valid in this context */
1300                 dev_dbg(&intf->dev, "The data interface isn't available\n");
1301                 return -EBUSY;
1302         }
1303
1304
1305         if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1306             control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1307                 return -EINVAL;
1308
1309         epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1310         epread = &data_interface->cur_altsetting->endpoint[0].desc;
1311         epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1312
1313
1314         /* workaround for switched endpoints */
1315         if (!usb_endpoint_dir_in(epread)) {
1316                 /* descriptors are swapped */
1317                 dev_dbg(&intf->dev,
1318                         "The data interface has switched endpoints\n");
1319                 swap(epread, epwrite);
1320         }
1321 made_compressed_probe:
1322         dev_dbg(&intf->dev, "interfaces are valid\n");
1323
1324         acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1325         if (acm == NULL)
1326                 goto alloc_fail;
1327
1328         minor = acm_alloc_minor(acm);
1329         if (minor < 0)
1330                 goto alloc_fail1;
1331
1332         ctrlsize = usb_endpoint_maxp(epctrl);
1333         readsize = usb_endpoint_maxp(epread) *
1334                                 (quirks == SINGLE_RX_URB ? 1 : 2);
1335         acm->combined_interfaces = combined_interfaces;
1336         acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1337         acm->control = control_interface;
1338         acm->data = data_interface;
1339         acm->minor = minor;
1340         acm->dev = usb_dev;
1341         if (h.usb_cdc_acm_descriptor)
1342                 acm->ctrl_caps = h.usb_cdc_acm_descriptor->bmCapabilities;
1343         if (quirks & NO_CAP_LINE)
1344                 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1345         acm->ctrlsize = ctrlsize;
1346         acm->readsize = readsize;
1347         acm->rx_buflimit = num_rx_buf;
1348         INIT_WORK(&acm->work, acm_softint);
1349         init_waitqueue_head(&acm->wioctl);
1350         spin_lock_init(&acm->write_lock);
1351         spin_lock_init(&acm->read_lock);
1352         mutex_init(&acm->mutex);
1353         acm->is_int_ep = usb_endpoint_xfer_int(epread);
1354         if (acm->is_int_ep)
1355                 acm->bInterval = epread->bInterval;
1356         tty_port_init(&acm->port);
1357         acm->port.ops = &acm_port_ops;
1358         init_usb_anchor(&acm->delayed);
1359         acm->quirks = quirks;
1360
1361         buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1362         if (!buf)
1363                 goto alloc_fail2;
1364         acm->ctrl_buffer = buf;
1365
1366         if (acm_write_buffers_alloc(acm) < 0)
1367                 goto alloc_fail4;
1368
1369         acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1370         if (!acm->ctrlurb)
1371                 goto alloc_fail5;
1372
1373         for (i = 0; i < num_rx_buf; i++) {
1374                 struct acm_rb *rb = &(acm->read_buffers[i]);
1375                 struct urb *urb;
1376
1377                 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1378                                                                 &rb->dma);
1379                 if (!rb->base)
1380                         goto alloc_fail6;
1381                 rb->index = i;
1382                 rb->instance = acm;
1383
1384                 urb = usb_alloc_urb(0, GFP_KERNEL);
1385                 if (!urb)
1386                         goto alloc_fail6;
1387
1388                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1389                 urb->transfer_dma = rb->dma;
1390                 if (acm->is_int_ep) {
1391                         usb_fill_int_urb(urb, acm->dev,
1392                                          usb_rcvintpipe(usb_dev, epread->bEndpointAddress),
1393                                          rb->base,
1394                                          acm->readsize,
1395                                          acm_read_bulk_callback, rb,
1396                                          acm->bInterval);
1397                 } else {
1398                         usb_fill_bulk_urb(urb, acm->dev,
1399                                           usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress),
1400                                           rb->base,
1401                                           acm->readsize,
1402                                           acm_read_bulk_callback, rb);
1403                 }
1404
1405                 acm->read_urbs[i] = urb;
1406                 __set_bit(i, &acm->read_urbs_free);
1407         }
1408         for (i = 0; i < ACM_NW; i++) {
1409                 struct acm_wb *snd = &(acm->wb[i]);
1410
1411                 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1412                 if (snd->urb == NULL)
1413                         goto alloc_fail7;
1414
1415                 if (usb_endpoint_xfer_int(epwrite))
1416                         usb_fill_int_urb(snd->urb, usb_dev,
1417                                 usb_sndintpipe(usb_dev, epwrite->bEndpointAddress),
1418                                 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1419                 else
1420                         usb_fill_bulk_urb(snd->urb, usb_dev,
1421                                 usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
1422                                 NULL, acm->writesize, acm_write_bulk, snd);
1423                 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1424                 if (quirks & SEND_ZERO_PACKET)
1425                         snd->urb->transfer_flags |= URB_ZERO_PACKET;
1426                 snd->instance = acm;
1427         }
1428
1429         usb_set_intfdata(intf, acm);
1430
1431         i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1432         if (i < 0)
1433                 goto alloc_fail7;
1434
1435         if (h.usb_cdc_country_functional_desc) { /* export the country data */
1436                 struct usb_cdc_country_functional_desc * cfd =
1437                                         h.usb_cdc_country_functional_desc;
1438
1439                 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1440                 if (!acm->country_codes)
1441                         goto skip_countries;
1442                 acm->country_code_size = cfd->bLength - 4;
1443                 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1444                                                         cfd->bLength - 4);
1445                 acm->country_rel_date = cfd->iCountryCodeRelDate;
1446
1447                 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1448                 if (i < 0) {
1449                         kfree(acm->country_codes);
1450                         acm->country_codes = NULL;
1451                         acm->country_code_size = 0;
1452                         goto skip_countries;
1453                 }
1454
1455                 i = device_create_file(&intf->dev,
1456                                                 &dev_attr_iCountryCodeRelDate);
1457                 if (i < 0) {
1458                         device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1459                         kfree(acm->country_codes);
1460                         acm->country_codes = NULL;
1461                         acm->country_code_size = 0;
1462                         goto skip_countries;
1463                 }
1464         }
1465
1466 skip_countries:
1467         usb_fill_int_urb(acm->ctrlurb, usb_dev,
1468                          usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1469                          acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1470                          /* works around buggy devices */
1471                          epctrl->bInterval ? epctrl->bInterval : 16);
1472         acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1473         acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1474
1475         dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1476
1477         acm->line.dwDTERate = cpu_to_le32(9600);
1478         acm->line.bDataBits = 8;
1479         acm_set_line(acm, &acm->line);
1480
1481         usb_driver_claim_interface(&acm_driver, data_interface, acm);
1482         usb_set_intfdata(data_interface, acm);
1483
1484         usb_get_intf(control_interface);
1485         tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1486                         &control_interface->dev);
1487         if (IS_ERR(tty_dev)) {
1488                 rv = PTR_ERR(tty_dev);
1489                 goto alloc_fail8;
1490         }
1491
1492         if (quirks & CLEAR_HALT_CONDITIONS) {
1493                 usb_clear_halt(usb_dev, usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress));
1494                 usb_clear_halt(usb_dev, usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress));
1495         }
1496
1497         return 0;
1498 alloc_fail8:
1499         if (acm->country_codes) {
1500                 device_remove_file(&acm->control->dev,
1501                                 &dev_attr_wCountryCodes);
1502                 device_remove_file(&acm->control->dev,
1503                                 &dev_attr_iCountryCodeRelDate);
1504                 kfree(acm->country_codes);
1505         }
1506         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1507 alloc_fail7:
1508         usb_set_intfdata(intf, NULL);
1509         for (i = 0; i < ACM_NW; i++)
1510                 usb_free_urb(acm->wb[i].urb);
1511 alloc_fail6:
1512         for (i = 0; i < num_rx_buf; i++)
1513                 usb_free_urb(acm->read_urbs[i]);
1514         acm_read_buffers_free(acm);
1515         usb_free_urb(acm->ctrlurb);
1516 alloc_fail5:
1517         acm_write_buffers_free(acm);
1518 alloc_fail4:
1519         usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1520 alloc_fail2:
1521         acm_release_minor(acm);
1522 alloc_fail1:
1523         kfree(acm);
1524 alloc_fail:
1525         return rv;
1526 }
1527
1528 static void stop_data_traffic(struct acm *acm)
1529 {
1530         int i;
1531
1532         usb_kill_urb(acm->ctrlurb);
1533         for (i = 0; i < ACM_NW; i++)
1534                 usb_kill_urb(acm->wb[i].urb);
1535         for (i = 0; i < acm->rx_buflimit; i++)
1536                 usb_kill_urb(acm->read_urbs[i]);
1537
1538         cancel_work_sync(&acm->work);
1539 }
1540
1541 static void acm_disconnect(struct usb_interface *intf)
1542 {
1543         struct acm *acm = usb_get_intfdata(intf);
1544         struct usb_device *usb_dev = interface_to_usbdev(intf);
1545         struct tty_struct *tty;
1546         int i;
1547
1548         /* sibling interface is already cleaning up */
1549         if (!acm)
1550                 return;
1551
1552         mutex_lock(&acm->mutex);
1553         acm->disconnected = true;
1554         if (acm->country_codes) {
1555                 device_remove_file(&acm->control->dev,
1556                                 &dev_attr_wCountryCodes);
1557                 device_remove_file(&acm->control->dev,
1558                                 &dev_attr_iCountryCodeRelDate);
1559         }
1560         wake_up_all(&acm->wioctl);
1561         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1562         usb_set_intfdata(acm->control, NULL);
1563         usb_set_intfdata(acm->data, NULL);
1564         mutex_unlock(&acm->mutex);
1565
1566         tty = tty_port_tty_get(&acm->port);
1567         if (tty) {
1568                 tty_vhangup(tty);
1569                 tty_kref_put(tty);
1570         }
1571
1572         stop_data_traffic(acm);
1573
1574         tty_unregister_device(acm_tty_driver, acm->minor);
1575
1576         usb_free_urb(acm->ctrlurb);
1577         for (i = 0; i < ACM_NW; i++)
1578                 usb_free_urb(acm->wb[i].urb);
1579         for (i = 0; i < acm->rx_buflimit; i++)
1580                 usb_free_urb(acm->read_urbs[i]);
1581         acm_write_buffers_free(acm);
1582         usb_free_coherent(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1583         acm_read_buffers_free(acm);
1584
1585         if (!acm->combined_interfaces)
1586                 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1587                                         acm->data : acm->control);
1588
1589         tty_port_put(&acm->port);
1590 }
1591
1592 #ifdef CONFIG_PM
1593 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1594 {
1595         struct acm *acm = usb_get_intfdata(intf);
1596         int cnt;
1597
1598         spin_lock_irq(&acm->write_lock);
1599         if (PMSG_IS_AUTO(message)) {
1600                 if (acm->transmitting) {
1601                         spin_unlock_irq(&acm->write_lock);
1602                         return -EBUSY;
1603                 }
1604         }
1605         cnt = acm->susp_count++;
1606         spin_unlock_irq(&acm->write_lock);
1607
1608         if (cnt)
1609                 return 0;
1610
1611         stop_data_traffic(acm);
1612
1613         return 0;
1614 }
1615
1616 static int acm_resume(struct usb_interface *intf)
1617 {
1618         struct acm *acm = usb_get_intfdata(intf);
1619         struct urb *urb;
1620         int rv = 0;
1621
1622         spin_lock_irq(&acm->write_lock);
1623
1624         if (--acm->susp_count)
1625                 goto out;
1626
1627         if (tty_port_initialized(&acm->port)) {
1628                 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1629
1630                 for (;;) {
1631                         urb = usb_get_from_anchor(&acm->delayed);
1632                         if (!urb)
1633                                 break;
1634
1635                         acm_start_wb(acm, urb->context);
1636                 }
1637
1638                 /*
1639                  * delayed error checking because we must
1640                  * do the write path at all cost
1641                  */
1642                 if (rv < 0)
1643                         goto out;
1644
1645                 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1646         }
1647 out:
1648         spin_unlock_irq(&acm->write_lock);
1649
1650         return rv;
1651 }
1652
1653 static int acm_reset_resume(struct usb_interface *intf)
1654 {
1655         struct acm *acm = usb_get_intfdata(intf);
1656
1657         if (tty_port_initialized(&acm->port))
1658                 tty_port_tty_hangup(&acm->port, false);
1659
1660         return acm_resume(intf);
1661 }
1662
1663 #endif /* CONFIG_PM */
1664
1665 #define NOKIA_PCSUITE_ACM_INFO(x) \
1666                 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1667                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1668                 USB_CDC_ACM_PROTO_VENDOR)
1669
1670 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1671                 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1672                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1673                 USB_CDC_ACM_PROTO_VENDOR)
1674
1675 /*
1676  * USB driver structure.
1677  */
1678
1679 static const struct usb_device_id acm_ids[] = {
1680         /* quirky and broken devices */
1681         { USB_DEVICE(0x076d, 0x0006), /* Denso Cradle CU-321 */
1682         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1683         { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1684         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1685         { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1686         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1687         },
1688         { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1689         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1690         },
1691         { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1692         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1693         },
1694         { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1695         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1696         },
1697         { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1698         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1699         },
1700         { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1701         .driver_info = SINGLE_RX_URB,
1702         },
1703         { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1704         .driver_info = SINGLE_RX_URB, /* firmware bug */
1705         },
1706         { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1707         .driver_info = SINGLE_RX_URB, /* firmware bug */
1708         },
1709         { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1710         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1711         },
1712         { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1713         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1714         },
1715         { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1716         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1717         },
1718         { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1719         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1720         },
1721         { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1722         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1723         },
1724         { USB_DEVICE(0x20df, 0x0001), /* Simtec Electronics Entropy Key */
1725         .driver_info = QUIRK_CONTROL_LINE_STATE, },
1726         { USB_DEVICE(0x2184, 0x001c) }, /* GW Instek AFG-2225 */
1727         { USB_DEVICE(0x2184, 0x0036) }, /* GW Instek AFG-125 */
1728         { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1729         },
1730         /* Motorola H24 HSPA module: */
1731         { USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1732         { USB_DEVICE(0x22b8, 0x2d92),   /* modem           + diagnostics        */
1733         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1734         },
1735         { USB_DEVICE(0x22b8, 0x2d93),   /* modem + AT port                      */
1736         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1737         },
1738         { USB_DEVICE(0x22b8, 0x2d95),   /* modem + AT port + diagnostics        */
1739         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1740         },
1741         { USB_DEVICE(0x22b8, 0x2d96),   /* modem                         + NMEA */
1742         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1743         },
1744         { USB_DEVICE(0x22b8, 0x2d97),   /* modem           + diagnostics + NMEA */
1745         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1746         },
1747         { USB_DEVICE(0x22b8, 0x2d99),   /* modem + AT port               + NMEA */
1748         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1749         },
1750         { USB_DEVICE(0x22b8, 0x2d9a),   /* modem + AT port + diagnostics + NMEA */
1751         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1752         },
1753
1754         { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1755         .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1756                                            data interface instead of
1757                                            communications interface.
1758                                            Maybe we should define a new
1759                                            quirk for this. */
1760         },
1761         { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1762         .driver_info = NO_UNION_NORMAL,
1763         },
1764         { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1765         .driver_info = NO_UNION_NORMAL,
1766         },
1767         { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1768         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1769         },
1770         { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1771         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1772         },
1773         { USB_DEVICE(0xfff0, 0x0100), /* DATECS FP-2000 */
1774         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1775         },
1776         { USB_DEVICE(0x09d8, 0x0320), /* Elatec GmbH TWN3 */
1777         .driver_info = NO_UNION_NORMAL, /* has misplaced union descriptor */
1778         },
1779
1780         { USB_DEVICE(0x2912, 0x0001), /* ATOL FPrint */
1781         .driver_info = CLEAR_HALT_CONDITIONS,
1782         },
1783
1784         /* Nokia S60 phones expose two ACM channels. The first is
1785          * a modem and is picked up by the standard AT-command
1786          * information below. The second is 'vendor-specific' but
1787          * is treated as a serial device at the S60 end, so we want
1788          * to expose it on Linux too. */
1789         { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1790         { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1791         { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1792         { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1793         { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1794         { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1795         { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1796         { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1797         { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1798         { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1799         { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1800         { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1801         { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1802         { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1803         { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1804         { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1805         { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1806         { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1807         { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1808         { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1809         { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1810         { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1811         { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1812         { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1813         { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1814         { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1815         { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1816         { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1817         { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1818         { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1819         { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1820         { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
1821         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1822         { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1823         { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1824         { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1825         { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1826         { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1827         { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1828         { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1829         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1830         { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1831         { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1832         { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1833         { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1834         { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1835         { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1836         { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1837         { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1838         { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1839         { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1840         { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1841         { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1842         { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1843         { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1844         { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1845         { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1846         { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1847
1848         /* Support for Owen devices */
1849         { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1850
1851         /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1852
1853         /* Support for Droids MuIn LCD */
1854         { USB_DEVICE(0x04d8, 0x000b),
1855         .driver_info = NO_DATA_INTERFACE,
1856         },
1857
1858 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1859         { USB_DEVICE(0x04d8, 0x0082),   /* Application mode */
1860         .driver_info = IGNORE_DEVICE,
1861         },
1862         { USB_DEVICE(0x04d8, 0x0083),   /* Bootloader mode */
1863         .driver_info = IGNORE_DEVICE,
1864         },
1865 #endif
1866
1867         /*Samsung phone in firmware update mode */
1868         { USB_DEVICE(0x04e8, 0x685d),
1869         .driver_info = IGNORE_DEVICE,
1870         },
1871
1872         /* Exclude Infineon Flash Loader utility */
1873         { USB_DEVICE(0x058b, 0x0041),
1874         .driver_info = IGNORE_DEVICE,
1875         },
1876
1877         /* control interfaces without any protocol set */
1878         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1879                 USB_CDC_PROTO_NONE) },
1880
1881         /* control interfaces with various AT-command sets */
1882         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1883                 USB_CDC_ACM_PROTO_AT_V25TER) },
1884         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1885                 USB_CDC_ACM_PROTO_AT_PCCA101) },
1886         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1887                 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1888         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1889                 USB_CDC_ACM_PROTO_AT_GSM) },
1890         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1891                 USB_CDC_ACM_PROTO_AT_3G) },
1892         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1893                 USB_CDC_ACM_PROTO_AT_CDMA) },
1894
1895         { USB_DEVICE(0x1519, 0x0452), /* Intel 7260 modem */
1896         .driver_info = SEND_ZERO_PACKET,
1897         },
1898
1899         { }
1900 };
1901
1902 MODULE_DEVICE_TABLE(usb, acm_ids);
1903
1904 static struct usb_driver acm_driver = {
1905         .name =         "cdc_acm",
1906         .probe =        acm_probe,
1907         .disconnect =   acm_disconnect,
1908 #ifdef CONFIG_PM
1909         .suspend =      acm_suspend,
1910         .resume =       acm_resume,
1911         .reset_resume = acm_reset_resume,
1912 #endif
1913         .id_table =     acm_ids,
1914 #ifdef CONFIG_PM
1915         .supports_autosuspend = 1,
1916 #endif
1917         .disable_hub_initiated_lpm = 1,
1918 };
1919
1920 /*
1921  * TTY driver structures.
1922  */
1923
1924 static const struct tty_operations acm_ops = {
1925         .install =              acm_tty_install,
1926         .open =                 acm_tty_open,
1927         .close =                acm_tty_close,
1928         .cleanup =              acm_tty_cleanup,
1929         .hangup =               acm_tty_hangup,
1930         .write =                acm_tty_write,
1931         .put_char =             acm_tty_put_char,
1932         .flush_chars =          acm_tty_flush_chars,
1933         .write_room =           acm_tty_write_room,
1934         .ioctl =                acm_tty_ioctl,
1935         .throttle =             acm_tty_throttle,
1936         .unthrottle =           acm_tty_unthrottle,
1937         .chars_in_buffer =      acm_tty_chars_in_buffer,
1938         .break_ctl =            acm_tty_break_ctl,
1939         .set_termios =          acm_tty_set_termios,
1940         .tiocmget =             acm_tty_tiocmget,
1941         .tiocmset =             acm_tty_tiocmset,
1942 };
1943
1944 /*
1945  * Init / exit.
1946  */
1947
1948 static int __init acm_init(void)
1949 {
1950         int retval;
1951         acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1952         if (!acm_tty_driver)
1953                 return -ENOMEM;
1954         acm_tty_driver->driver_name = "acm",
1955         acm_tty_driver->name = "ttyACM",
1956         acm_tty_driver->major = ACM_TTY_MAJOR,
1957         acm_tty_driver->minor_start = 0,
1958         acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1959         acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1960         acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1961         acm_tty_driver->init_termios = tty_std_termios;
1962         acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1963                                                                 HUPCL | CLOCAL;
1964         tty_set_operations(acm_tty_driver, &acm_ops);
1965
1966         retval = tty_register_driver(acm_tty_driver);
1967         if (retval) {
1968                 put_tty_driver(acm_tty_driver);
1969                 return retval;
1970         }
1971
1972         retval = usb_register(&acm_driver);
1973         if (retval) {
1974                 tty_unregister_driver(acm_tty_driver);
1975                 put_tty_driver(acm_tty_driver);
1976                 return retval;
1977         }
1978
1979         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1980
1981         return 0;
1982 }
1983
1984 static void __exit acm_exit(void)
1985 {
1986         usb_deregister(&acm_driver);
1987         tty_unregister_driver(acm_tty_driver);
1988         put_tty_driver(acm_tty_driver);
1989         idr_destroy(&acm_minors);
1990 }
1991
1992 module_init(acm_init);
1993 module_exit(acm_exit);
1994
1995 MODULE_AUTHOR(DRIVER_AUTHOR);
1996 MODULE_DESCRIPTION(DRIVER_DESC);
1997 MODULE_LICENSE("GPL");
1998 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);