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 static void acm_kill_urbs(struct acm *acm)
 162 {
 163         int i;
 164
 165         usb_kill_urb(acm->ctrlurb);
 166         for (i = 0; i < ACM_NW; i++)
 167                 usb_kill_urb(acm->wb[i].urb);
 168         for (i = 0; i < acm->rx_buflimit; i++)
 169                 usb_kill_urb(acm->read_urbs[i]);
 170 }
 171
 172 /*
 173  * Write buffer management.
 174  * All of these assume proper locks taken by the caller.
 175  */
 176
 177 static int acm_wb_alloc(struct acm *acm)
 178 {
 179         int i, wbn;
 180         struct acm_wb *wb;
 181
 182         wbn = 0;
 183         i = 0;
 184         for (;;) {
 185                 wb = &acm->wb[wbn];
 186                 if (!wb->use) {
 187                         wb->use = 1;
 188                         return wbn;
 189                 }
 190                 wbn = (wbn + 1) % ACM_NW;
 191                 if (++i >= ACM_NW)
 192                         return -1;
 193         }
 194 }
 195
 196 static int acm_wb_is_avail(struct acm *acm)
 197 {
 198         int i, n;
 199         unsigned long flags;
 200
 201         n = ACM_NW;
 202         spin_lock_irqsave(&acm->write_lock, flags);
 203         for (i = 0; i < ACM_NW; i++)
 204                 n -= acm->wb[i].use;
 205         spin_unlock_irqrestore(&acm->write_lock, flags);
 206         return n;
 207 }
 208
 209 /*
 210  * Finish write. Caller must hold acm->write_lock
 211  */
 212 static void acm_write_done(struct acm *acm, struct acm_wb *wb)
 213 {
 214         wb->use = 0;
 215         acm->transmitting--;
 216         usb_autopm_put_interface_async(acm->control);
 217 }
 218
 219 /*
 220  * Poke write.
 221  *
 222  * the caller is responsible for locking
 223  */
 224
 225 static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
 226 {
 227         int rc;
 228
 229         acm->transmitting++;
 230
 231         wb->urb->transfer_buffer = wb->buf;
 232         wb->urb->transfer_dma = wb->dmah;
 233         wb->urb->transfer_buffer_length = wb->len;
 234         wb->urb->dev = acm->dev;
 235
 236         rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
 237         if (rc < 0) {
 238                 dev_err(&acm->data->dev,
 239                         "%s - usb_submit_urb(write bulk) failed: %d\n",
 240                         __func__, rc);
 241                 acm_write_done(acm, wb);
 242         }
 243         return rc;
 244 }
 245
 246 /*
 247  * attributes exported through sysfs
 248  */
 249 static ssize_t show_caps
 250 (struct device *dev, struct device_attribute *attr, char *buf)
 251 {
 252         struct usb_interface *intf = to_usb_interface(dev);
 253         struct acm *acm = usb_get_intfdata(intf);
 254
 255         return sprintf(buf, "%d", acm->ctrl_caps);
 256 }
 257 static DEVICE_ATTR(bmCapabilities, S_IRUGO, show_caps, NULL);
 258
 259 static ssize_t show_country_codes
 260 (struct device *dev, struct device_attribute *attr, char *buf)
 261 {
 262         struct usb_interface *intf = to_usb_interface(dev);
 263         struct acm *acm = usb_get_intfdata(intf);
 264
 265         memcpy(buf, acm->country_codes, acm->country_code_size);
 266         return acm->country_code_size;
 267 }
 268
 269 static DEVICE_ATTR(wCountryCodes, S_IRUGO, show_country_codes, NULL);
 270
 271 static ssize_t show_country_rel_date
 272 (struct device *dev, struct device_attribute *attr, char *buf)
 273 {
 274         struct usb_interface *intf = to_usb_interface(dev);
 275         struct acm *acm = usb_get_intfdata(intf);
 276
 277         return sprintf(buf, "%d", acm->country_rel_date);
 278 }
 279
 280 static DEVICE_ATTR(iCountryCodeRelDate, S_IRUGO, show_country_rel_date, NULL);
 281 /*
 282  * Interrupt handlers for various ACM device responses
 283  */
 284
 285 /* control interface reports status changes with "interrupt" transfers */
 286 static void acm_ctrl_irq(struct urb *urb)
 287 {
 288         struct acm *acm = urb->context;
 289         struct usb_cdc_notification *dr = urb->transfer_buffer;
 290         unsigned char *data;
 291         int newctrl;
 292         int difference;
 293         int retval;
 294         int status = urb->status;
 295
 296         switch (status) {
 297         case 0:
 298                 /* success */
 299                 break;
 300         case -ECONNRESET:
 301         case -ENOENT:
 302         case -ESHUTDOWN:
 303                 /* this urb is terminated, clean up */
 304                 dev_dbg(&acm->control->dev,
 305                         "%s - urb shutting down with status: %d\n",
 306                         __func__, status);
 307                 return;
 308         default:
 309                 dev_dbg(&acm->control->dev,
 310                         "%s - nonzero urb status received: %d\n",
 311                         __func__, status);
 312                 goto exit;
 313         }
 314
 315         usb_mark_last_busy(acm->dev);
 316
 317         data = (unsigned char *)(dr + 1);
 318         switch (dr->bNotificationType) {
 319         case USB_CDC_NOTIFY_NETWORK_CONNECTION:
 320                 dev_dbg(&acm->control->dev,
 321                         "%s - network connection: %d\n", __func__, dr->wValue);
 322                 break;
 323
 324         case USB_CDC_NOTIFY_SERIAL_STATE:
 325                 newctrl = get_unaligned_le16(data);
 326
 327                 if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
 328                         dev_dbg(&acm->control->dev,
 329                                 "%s - calling hangup\n", __func__);
 330                         tty_port_tty_hangup(&acm->port, false);
 331                 }
 332
 333                 difference = acm->ctrlin ^ newctrl;
 334                 spin_lock(&acm->read_lock);
 335                 acm->ctrlin = newctrl;
 336                 acm->oldcount = acm->iocount;
 337
 338                 if (difference & ACM_CTRL_DSR)
 339                         acm->iocount.dsr++;
 340                 if (difference & ACM_CTRL_BRK)
 341                         acm->iocount.brk++;
 342                 if (difference & ACM_CTRL_RI)
 343                         acm->iocount.rng++;
 344                 if (difference & ACM_CTRL_DCD)
 345                         acm->iocount.dcd++;
 346                 if (difference & ACM_CTRL_FRAMING)
 347                         acm->iocount.frame++;
 348                 if (difference & ACM_CTRL_PARITY)
 349                         acm->iocount.parity++;
 350                 if (difference & ACM_CTRL_OVERRUN)
 351                         acm->iocount.overrun++;
 352                 spin_unlock(&acm->read_lock);
 353
 354                 if (difference)
 355                         wake_up_all(&acm->wioctl);
 356
 357                 break;
 358
 359         default:
 360                 dev_dbg(&acm->control->dev,
 361                         "%s - unknown notification %d received: index %d "
 362                         "len %d data0 %d data1 %d\n",
 363                         __func__,
 364                         dr->bNotificationType, dr->wIndex,
 365                         dr->wLength, data[0], data[1]);
 366                 break;
 367         }
 368 exit:
 369         retval = usb_submit_urb(urb, GFP_ATOMIC);
 370         if (retval && retval != -EPERM)
 371                 dev_err(&acm->control->dev,
 372                         "%s - usb_submit_urb failed: %d\n", __func__, retval);
 373 }
 374
 375 static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
 376 {
 377         int res;
 378
 379         if (!test_and_clear_bit(index, &acm->read_urbs_free))
 380                 return 0;
 381
 382         res = usb_submit_urb(acm->read_urbs[index], mem_flags);
 383         if (res) {
 384                 if (res != -EPERM) {
 385                         dev_err(&acm->data->dev,
 386                                 "urb %d failed submission with %d\n",
 387                                 index, res);
 388                 }
 389                 set_bit(index, &acm->read_urbs_free);
 390                 return res;
 391         } else {
 392                 dev_vdbg(&acm->data->dev, "submitted urb %d\n", index);
 393         }
 394
 395         return 0;
 396 }
 397
 398 static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
 399 {
 400         int res;
 401         int i;
 402
 403         for (i = 0; i < acm->rx_buflimit; ++i) {
 404                 res = acm_submit_read_urb(acm, i, mem_flags);
 405                 if (res)
 406                         return res;
 407         }
 408
 409         return 0;
 410 }
 411
 412 static void acm_process_read_urb(struct acm *acm, struct urb *urb)
 413 {
 414         if (!urb->actual_length)
 415                 return;
 416
 417         tty_insert_flip_string(&acm->port, urb->transfer_buffer,
 418                         urb->actual_length);
 419         tty_flip_buffer_push(&acm->port);
 420 }
 421
 422 static void acm_read_bulk_callback(struct urb *urb)
 423 {
 424         struct acm_rb *rb = urb->context;
 425         struct acm *acm = rb->instance;
 426         unsigned long flags;
 427         int status = urb->status;
 428
 429         dev_vdbg(&acm->data->dev, "got urb %d, len %d, status %d\n",
 430                 rb->index, urb->actual_length, status);
 431
 432         set_bit(rb->index, &acm->read_urbs_free);
 433
 434         if (!acm->dev) {
 435                 dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
 436                 return;
 437         }
 438
 439         switch (status) {
 440         case 0:
 441                 usb_mark_last_busy(acm->dev);
 442                 acm_process_read_urb(acm, urb);
 443                 break;
 444         case -EPIPE:
 445                 set_bit(EVENT_RX_STALL, &acm->flags);
 446                 schedule_work(&acm->work);
 447                 return;
 448         case -ENOENT:
 449         case -ECONNRESET:
 450         case -ESHUTDOWN:
 451                 dev_dbg(&acm->data->dev,
 452                         "%s - urb shutting down with status: %d\n",
 453                         __func__, status);
 454                 return;
 455         default:
 456                 dev_dbg(&acm->data->dev,
 457                         "%s - nonzero urb status received: %d\n",
 458                         __func__, status);
 459                 break;
 460         }
 461
 462         /*
 463          * Unthrottle may run on another CPU which needs to see events
 464          * in the same order. Submission has an implict barrier
 465          */
 466         smp_mb__before_atomic();
 467
 468         /* throttle device if requested by tty */
 469         spin_lock_irqsave(&acm->read_lock, flags);
 470         acm->throttled = acm->throttle_req;
 471         if (!acm->throttled) {
 472                 spin_unlock_irqrestore(&acm->read_lock, flags);
 473                 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
 474         } else {
 475                 spin_unlock_irqrestore(&acm->read_lock, flags);
 476         }
 477 }
 478
 479 /* data interface wrote those outgoing bytes */
 480 static void acm_write_bulk(struct urb *urb)
 481 {
 482         struct acm_wb *wb = urb->context;
 483         struct acm *acm = wb->instance;
 484         unsigned long flags;
 485         int status = urb->status;
 486
 487         if (status || (urb->actual_length != urb->transfer_buffer_length))
 488                 dev_vdbg(&acm->data->dev, "wrote len %d/%d, status %d\n",
 489                         urb->actual_length,
 490                         urb->transfer_buffer_length,
 491                         status);
 492
 493         spin_lock_irqsave(&acm->write_lock, flags);
 494         acm_write_done(acm, wb);
 495         spin_unlock_irqrestore(&acm->write_lock, flags);
 496         set_bit(EVENT_TTY_WAKEUP, &acm->flags);
 497         schedule_work(&acm->work);
 498 }
 499
 500 static void acm_softint(struct work_struct *work)
 501 {
 502         int i;
 503         struct acm *acm = container_of(work, struct acm, work);
 504
 505         if (test_bit(EVENT_RX_STALL, &acm->flags)) {
 506                 if (!(usb_autopm_get_interface(acm->data))) {
 507                         for (i = 0; i < acm->rx_buflimit; i++)
 508                                 usb_kill_urb(acm->read_urbs[i]);
 509                         usb_clear_halt(acm->dev, acm->in);
 510                         acm_submit_read_urbs(acm, GFP_KERNEL);
 511                         usb_autopm_put_interface(acm->data);
 512                 }
 513                 clear_bit(EVENT_RX_STALL, &acm->flags);
 514         }
 515
 516         if (test_bit(EVENT_TTY_WAKEUP, &acm->flags)) {
 517                 tty_port_tty_wakeup(&acm->port);
 518                 clear_bit(EVENT_TTY_WAKEUP, &acm->flags);
 519         }
 520 }
 521
 522 /*
 523  * TTY handlers
 524  */
 525
 526 static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
 527 {
 528         struct acm *acm;
 529         int retval;
 530
 531         acm = acm_get_by_minor(tty->index);
 532         if (!acm)
 533                 return -ENODEV;
 534
 535         retval = tty_standard_install(driver, tty);
 536         if (retval)
 537                 goto error_init_termios;
 538
 539         tty->driver_data = acm;
 540
 541         return 0;
 542
 543 error_init_termios:
 544         tty_port_put(&acm->port);
 545         return retval;
 546 }
 547
 548 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
 549 {
 550         struct acm *acm = tty->driver_data;
 551
 552         return tty_port_open(&acm->port, tty, filp);
 553 }
 554
 555 static void acm_port_dtr_rts(struct tty_port *port, int raise)
 556 {
 557         struct acm *acm = container_of(port, struct acm, port);
 558         int val;
 559         int res;
 560
 561         if (raise)
 562                 val = ACM_CTRL_DTR | ACM_CTRL_RTS;
 563         else
 564                 val = 0;
 565
 566         /* FIXME: add missing ctrlout locking throughout driver */
 567         acm->ctrlout = val;
 568
 569         res = acm_set_control(acm, val);
 570         if (res && (acm->ctrl_caps & USB_CDC_CAP_LINE))
 571                 dev_err(&acm->control->dev, "failed to set dtr/rts\n");
 572 }
 573
 574 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
 575 {
 576         struct acm *acm = container_of(port, struct acm, port);
 577         int retval = -ENODEV;
 578         int i;
 579
 580         mutex_lock(&acm->mutex);
 581         if (acm->disconnected)
 582                 goto disconnected;
 583
 584         retval = usb_autopm_get_interface(acm->control);
 585         if (retval)
 586                 goto error_get_interface;
 587
 588         /*
 589          * FIXME: Why do we need this? Allocating 64K of physically contiguous
 590          * memory is really nasty...
 591          */
 592         set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
 593         acm->control->needs_remote_wakeup = 1;
 594
 595         acm->ctrlurb->dev = acm->dev;
 596         retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
 597         if (retval) {
 598                 dev_err(&acm->control->dev,
 599                         "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
 600                 goto error_submit_urb;
 601         }
 602
 603         acm_tty_set_termios(tty, NULL);
 604
 605         /*
 606          * Unthrottle device in case the TTY was closed while throttled.
 607          */
 608         spin_lock_irq(&acm->read_lock);
 609         acm->throttled = 0;
 610         acm->throttle_req = 0;
 611         spin_unlock_irq(&acm->read_lock);
 612
 613         retval = acm_submit_read_urbs(acm, GFP_KERNEL);
 614         if (retval)
 615                 goto error_submit_read_urbs;
 616
 617         usb_autopm_put_interface(acm->control);
 618
 619         mutex_unlock(&acm->mutex);
 620
 621         return 0;
 622
 623 error_submit_read_urbs:
 624         for (i = 0; i < acm->rx_buflimit; i++)
 625                 usb_kill_urb(acm->read_urbs[i]);
 626         usb_kill_urb(acm->ctrlurb);
 627 error_submit_urb:
 628         usb_autopm_put_interface(acm->control);
 629 error_get_interface:
 630 disconnected:
 631         mutex_unlock(&acm->mutex);
 632
 633         return usb_translate_errors(retval);
 634 }
 635
 636 static void acm_port_destruct(struct tty_port *port)
 637 {
 638         struct acm *acm = container_of(port, struct acm, port);
 639
 640         acm_release_minor(acm);
 641         usb_put_intf(acm->control);
 642         kfree(acm->country_codes);
 643         kfree(acm);
 644 }
 645
 646 static void acm_port_shutdown(struct tty_port *port)
 647 {
 648         struct acm *acm = container_of(port, struct acm, port);
 649         struct urb *urb;
 650         struct acm_wb *wb;
 651
 652         /*
 653          * Need to grab write_lock to prevent race with resume, but no need to
 654          * hold it due to the tty-port initialised flag.
 655          */
 656         spin_lock_irq(&acm->write_lock);
 657         spin_unlock_irq(&acm->write_lock);
 658
 659         usb_autopm_get_interface_no_resume(acm->control);
 660         acm->control->needs_remote_wakeup = 0;
 661         usb_autopm_put_interface(acm->control);
 662
 663         for (;;) {
 664                 urb = usb_get_from_anchor(&acm->delayed);
 665                 if (!urb)
 666                         break;
 667                 wb = urb->context;
 668                 wb->use = 0;
 669                 usb_autopm_put_interface_async(acm->control);
 670         }
 671
 672         acm_kill_urbs(acm);
 673 }
 674
 675 static void acm_tty_cleanup(struct tty_struct *tty)
 676 {
 677         struct acm *acm = tty->driver_data;
 678
 679         tty_port_put(&acm->port);
 680 }
 681
 682 static void acm_tty_hangup(struct tty_struct *tty)
 683 {
 684         struct acm *acm = tty->driver_data;
 685
 686         tty_port_hangup(&acm->port);
 687 }
 688
 689 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
 690 {
 691         struct acm *acm = tty->driver_data;
 692
 693         tty_port_close(&acm->port, tty, filp);
 694 }
 695
 696 static int acm_tty_write(struct tty_struct *tty,
 697                                         const unsigned char *buf, int count)
 698 {
 699         struct acm *acm = tty->driver_data;
 700         int stat;
 701         unsigned long flags;
 702         int wbn;
 703         struct acm_wb *wb;
 704
 705         if (!count)
 706                 return 0;
 707
 708         dev_vdbg(&acm->data->dev, "%d bytes from tty layer\n", count);
 709
 710         spin_lock_irqsave(&acm->write_lock, flags);
 711         wbn = acm_wb_alloc(acm);
 712         if (wbn < 0) {
 713                 spin_unlock_irqrestore(&acm->write_lock, flags);
 714                 return 0;
 715         }
 716         wb = &acm->wb[wbn];
 717
 718         if (!acm->dev) {
 719                 wb->use = 0;
 720                 spin_unlock_irqrestore(&acm->write_lock, flags);
 721                 return -ENODEV;
 722         }
 723
 724         count = (count > acm->writesize) ? acm->writesize : count;
 725         dev_vdbg(&acm->data->dev, "writing %d bytes\n", count);
 726         memcpy(wb->buf, buf, count);
 727         wb->len = count;
 728
 729         stat = usb_autopm_get_interface_async(acm->control);
 730         if (stat) {
 731                 wb->use = 0;
 732                 spin_unlock_irqrestore(&acm->write_lock, flags);
 733                 return stat;
 734         }
 735
 736         if (acm->susp_count) {
 737                 if (acm->putbuffer) {
 738                         /* now to preserve order */
 739                         usb_anchor_urb(acm->putbuffer->urb, &acm->delayed);
 740                         acm->putbuffer = NULL;
 741                 }
 742                 usb_anchor_urb(wb->urb, &acm->delayed);
 743                 spin_unlock_irqrestore(&acm->write_lock, flags);
 744                 return count;
 745         } else {
 746                 if (acm->putbuffer) {
 747                         /* at this point there is no good way to handle errors */
 748                         acm_start_wb(acm, acm->putbuffer);
 749                         acm->putbuffer = NULL;
 750                 }
 751         }
 752
 753         stat = acm_start_wb(acm, wb);
 754         spin_unlock_irqrestore(&acm->write_lock, flags);
 755
 756         if (stat < 0)
 757                 return stat;
 758         return count;
 759 }
 760
 761 static void acm_tty_flush_chars(struct tty_struct *tty)
 762 {
 763         struct acm *acm = tty->driver_data;
 764         struct acm_wb *cur = acm->putbuffer;
 765         int err;
 766         unsigned long flags;
 767
 768         if (!cur) /* nothing to do */
 769                 return;
 770
 771         acm->putbuffer = NULL;
 772         err = usb_autopm_get_interface_async(acm->control);
 773         spin_lock_irqsave(&acm->write_lock, flags);
 774         if (err < 0) {
 775                 cur->use = 0;
 776                 acm->putbuffer = cur;
 777                 goto out;
 778         }
 779
 780         if (acm->susp_count)
 781                 usb_anchor_urb(cur->urb, &acm->delayed);
 782         else
 783                 acm_start_wb(acm, cur);
 784 out:
 785         spin_unlock_irqrestore(&acm->write_lock, flags);
 786         return;
 787 }
 788
 789 static int acm_tty_put_char(struct tty_struct *tty, unsigned char ch)
 790 {
 791         struct acm *acm = tty->driver_data;
 792         struct acm_wb *cur;
 793         int wbn;
 794         unsigned long flags;
 795
 796 overflow:
 797         cur = acm->putbuffer;
 798         if (!cur) {
 799                 spin_lock_irqsave(&acm->write_lock, flags);
 800                 wbn = acm_wb_alloc(acm);
 801                 if (wbn >= 0) {
 802                         cur = &acm->wb[wbn];
 803                         acm->putbuffer = cur;
 804                 }
 805                 spin_unlock_irqrestore(&acm->write_lock, flags);
 806                 if (!cur)
 807                         return 0;
 808         }
 809
 810         if (cur->len == acm->writesize) {
 811                 acm_tty_flush_chars(tty);
 812                 goto overflow;
 813         }
 814
 815         cur->buf[cur->len++] = ch;
 816         return 1;
 817 }
 818
 819 static int acm_tty_write_room(struct tty_struct *tty)
 820 {
 821         struct acm *acm = tty->driver_data;
 822         /*
 823          * Do not let the line discipline to know that we have a reserve,
 824          * or it might get too enthusiastic.
 825          */
 826         return acm_wb_is_avail(acm) ? acm->writesize : 0;
 827 }
 828
 829 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
 830 {
 831         struct acm *acm = tty->driver_data;
 832         /*
 833          * if the device was unplugged then any remaining characters fell out
 834          * of the connector ;)
 835          */
 836         if (acm->disconnected)
 837                 return 0;
 838         /*
 839          * This is inaccurate (overcounts), but it works.
 840          */
 841         return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
 842 }
 843
 844 static void acm_tty_throttle(struct tty_struct *tty)
 845 {
 846         struct acm *acm = tty->driver_data;
 847
 848         spin_lock_irq(&acm->read_lock);
 849         acm->throttle_req = 1;
 850         spin_unlock_irq(&acm->read_lock);
 851 }
 852
 853 static void acm_tty_unthrottle(struct tty_struct *tty)
 854 {
 855         struct acm *acm = tty->driver_data;
 856         unsigned int was_throttled;
 857
 858         spin_lock_irq(&acm->read_lock);
 859         was_throttled = acm->throttled;
 860         acm->throttled = 0;
 861         acm->throttle_req = 0;
 862         spin_unlock_irq(&acm->read_lock);
 863
 864         if (was_throttled)
 865                 acm_submit_read_urbs(acm, GFP_KERNEL);
 866 }
 867
 868 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
 869 {
 870         struct acm *acm = tty->driver_data;
 871         int retval;
 872
 873         retval = acm_send_break(acm, state ? 0xffff : 0);
 874         if (retval < 0)
 875                 dev_dbg(&acm->control->dev,
 876                         "%s - send break failed\n", __func__);
 877         return retval;
 878 }
 879
 880 static int acm_tty_tiocmget(struct tty_struct *tty)
 881 {
 882         struct acm *acm = tty->driver_data;
 883
 884         return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
 885                (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
 886                (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
 887                (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
 888                (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
 889                TIOCM_CTS;
 890 }
 891
 892 static int acm_tty_tiocmset(struct tty_struct *tty,
 893                             unsigned int set, unsigned int clear)
 894 {
 895         struct acm *acm = tty->driver_data;
 896         unsigned int newctrl;
 897
 898         newctrl = acm->ctrlout;
 899         set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 900                                         (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 901         clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 902                                         (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 903
 904         newctrl = (newctrl & ~clear) | set;
 905
 906         if (acm->ctrlout == newctrl)
 907                 return 0;
 908         return acm_set_control(acm, acm->ctrlout = newctrl);
 909 }
 910
 911 static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
 912 {
 913         struct serial_struct tmp;
 914
 915         memset(&tmp, 0, sizeof(tmp));
 916         tmp.xmit_fifo_size = acm->writesize;
 917         tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
 918         tmp.close_delay = acm->port.close_delay / 10;
 919         tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 920                                 ASYNC_CLOSING_WAIT_NONE :
 921                                 acm->port.closing_wait / 10;
 922
 923         if (copy_to_user(info, &tmp, sizeof(tmp)))
 924                 return -EFAULT;
 925         else
 926                 return 0;
 927 }
 928
 929 static int set_serial_info(struct acm *acm,
 930                                 struct serial_struct __user *newinfo)
 931 {
 932         struct serial_struct new_serial;
 933         unsigned int closing_wait, close_delay;
 934         int retval = 0;
 935
 936         if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
 937                 return -EFAULT;
 938
 939         close_delay = new_serial.close_delay * 10;
 940         closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 941                         ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
 942
 943         mutex_lock(&acm->port.mutex);
 944
 945         if (!capable(CAP_SYS_ADMIN)) {
 946                 if ((close_delay != acm->port.close_delay) ||
 947                     (closing_wait != acm->port.closing_wait))
 948                         retval = -EPERM;
 949                 else
 950                         retval = -EOPNOTSUPP;
 951         } else {
 952                 acm->port.close_delay  = close_delay;
 953                 acm->port.closing_wait = closing_wait;
 954         }
 955
 956         mutex_unlock(&acm->port.mutex);
 957         return retval;
 958 }
 959
 960 static int wait_serial_change(struct acm *acm, unsigned long arg)
 961 {
 962         int rv = 0;
 963         DECLARE_WAITQUEUE(wait, current);
 964         struct async_icount old, new;
 965
 966         do {
 967                 spin_lock_irq(&acm->read_lock);
 968                 old = acm->oldcount;
 969                 new = acm->iocount;
 970                 acm->oldcount = new;
 971                 spin_unlock_irq(&acm->read_lock);
 972
 973                 if ((arg & TIOCM_DSR) &&
 974                         old.dsr != new.dsr)
 975                         break;
 976                 if ((arg & TIOCM_CD)  &&
 977                         old.dcd != new.dcd)
 978                         break;
 979                 if ((arg & TIOCM_RI) &&
 980                         old.rng != new.rng)
 981                         break;
 982
 983                 add_wait_queue(&acm->wioctl, &wait);
 984                 set_current_state(TASK_INTERRUPTIBLE);
 985                 schedule();
 986                 remove_wait_queue(&acm->wioctl, &wait);
 987                 if (acm->disconnected) {
 988                         if (arg & TIOCM_CD)
 989                                 break;
 990                         else
 991                                 rv = -ENODEV;
 992                 } else {
 993                         if (signal_pending(current))
 994                                 rv = -ERESTARTSYS;
 995                 }
 996         } while (!rv);
 997
 998
 999
1000         return rv;
1001 }
1002
1003 static int acm_tty_get_icount(struct tty_struct *tty,
1004                                         struct serial_icounter_struct *icount)
1005 {
1006         struct acm *acm = tty->driver_data;
1007
1008         icount->dsr = acm->iocount.dsr;
1009         icount->rng = acm->iocount.rng;
1010         icount->dcd = acm->iocount.dcd;
1011         icount->frame = acm->iocount.frame;
1012         icount->overrun = acm->iocount.overrun;
1013         icount->parity = acm->iocount.parity;
1014         icount->brk = acm->iocount.brk;
1015
1016         return 0;
1017 }
1018
1019 static int acm_tty_ioctl(struct tty_struct *tty,
1020                                         unsigned int cmd, unsigned long arg)
1021 {
1022         struct acm *acm = tty->driver_data;
1023         int rv = -ENOIOCTLCMD;
1024
1025         switch (cmd) {
1026         case TIOCGSERIAL: /* gets serial port data */
1027                 rv = get_serial_info(acm, (struct serial_struct __user *) arg);
1028                 break;
1029         case TIOCSSERIAL:
1030                 rv = set_serial_info(acm, (struct serial_struct __user *) arg);
1031                 break;
1032         case TIOCMIWAIT:
1033                 rv = usb_autopm_get_interface(acm->control);
1034                 if (rv < 0) {
1035                         rv = -EIO;
1036                         break;
1037                 }
1038                 rv = wait_serial_change(acm, arg);
1039                 usb_autopm_put_interface(acm->control);
1040                 break;
1041         }
1042
1043         return rv;
1044 }
1045
1046 static void acm_tty_set_termios(struct tty_struct *tty,
1047                                                 struct ktermios *termios_old)
1048 {
1049         struct acm *acm = tty->driver_data;
1050         struct ktermios *termios = &tty->termios;
1051         struct usb_cdc_line_coding newline;
1052         int newctrl = acm->ctrlout;
1053
1054         newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
1055         newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
1056         newline.bParityType = termios->c_cflag & PARENB ?
1057                                 (termios->c_cflag & PARODD ? 1 : 2) +
1058                                 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
1059         switch (termios->c_cflag & CSIZE) {
1060         case CS5:
1061                 newline.bDataBits = 5;
1062                 break;
1063         case CS6:
1064                 newline.bDataBits = 6;
1065                 break;
1066         case CS7:
1067                 newline.bDataBits = 7;
1068                 break;
1069         case CS8:
1070         default:
1071                 newline.bDataBits = 8;
1072                 break;
1073         }
1074         /* FIXME: Needs to clear unsupported bits in the termios */
1075         acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
1076
1077         if (C_BAUD(tty) == B0) {
1078                 newline.dwDTERate = acm->line.dwDTERate;
1079                 newctrl &= ~ACM_CTRL_DTR;
1080         } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
1081                 newctrl |=  ACM_CTRL_DTR;
1082         }
1083
1084         if (newctrl != acm->ctrlout)
1085                 acm_set_control(acm, acm->ctrlout = newctrl);
1086
1087         if (memcmp(&acm->line, &newline, sizeof newline)) {
1088                 memcpy(&acm->line, &newline, sizeof newline);
1089                 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
1090                         __func__,
1091                         le32_to_cpu(newline.dwDTERate),
1092                         newline.bCharFormat, newline.bParityType,
1093                         newline.bDataBits);
1094                 acm_set_line(acm, &acm->line);
1095         }
1096 }
1097
1098 static const struct tty_port_operations acm_port_ops = {
1099         .dtr_rts = acm_port_dtr_rts,
1100         .shutdown = acm_port_shutdown,
1101         .activate = acm_port_activate,
1102         .destruct = acm_port_destruct,
1103 };
1104
1105 /*
1106  * USB probe and disconnect routines.
1107  */
1108
1109 /* Little helpers: write/read buffers free */
1110 static void acm_write_buffers_free(struct acm *acm)
1111 {
1112         int i;
1113         struct acm_wb *wb;
1114
1115         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1116                 usb_free_coherent(acm->dev, acm->writesize, wb->buf, wb->dmah);
1117 }
1118
1119 static void acm_read_buffers_free(struct acm *acm)
1120 {
1121         int i;
1122
1123         for (i = 0; i < acm->rx_buflimit; i++)
1124                 usb_free_coherent(acm->dev, acm->readsize,
1125                           acm->read_buffers[i].base, acm->read_buffers[i].dma);
1126 }
1127
1128 /* Little helper: write buffers allocate */
1129 static int acm_write_buffers_alloc(struct acm *acm)
1130 {
1131         int i;
1132         struct acm_wb *wb;
1133
1134         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1135                 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1136                     &wb->dmah);
1137                 if (!wb->buf) {
1138                         while (i != 0) {
1139                                 --i;
1140                                 --wb;
1141                                 usb_free_coherent(acm->dev, acm->writesize,
1142                                     wb->buf, wb->dmah);
1143                         }
1144                         return -ENOMEM;
1145                 }
1146         }
1147         return 0;
1148 }
1149
1150 static int acm_probe(struct usb_interface *intf,
1151                      const struct usb_device_id *id)
1152 {
1153         struct usb_cdc_union_desc *union_header = NULL;
1154         struct usb_cdc_call_mgmt_descriptor *cmgmd = NULL;
1155         unsigned char *buffer = intf->altsetting->extra;
1156         int buflen = intf->altsetting->extralen;
1157         struct usb_interface *control_interface;
1158         struct usb_interface *data_interface;
1159         struct usb_endpoint_descriptor *epctrl = NULL;
1160         struct usb_endpoint_descriptor *epread = NULL;
1161         struct usb_endpoint_descriptor *epwrite = NULL;
1162         struct usb_device *usb_dev = interface_to_usbdev(intf);
1163         struct usb_cdc_parsed_header h;
1164         struct acm *acm;
1165         int minor;
1166         int ctrlsize, readsize;
1167         u8 *buf;
1168         int call_intf_num = -1;
1169         int data_intf_num = -1;
1170         unsigned long quirks;
1171         int num_rx_buf;
1172         int i;
1173         int combined_interfaces = 0;
1174         struct device *tty_dev;
1175         int rv = -ENOMEM;
1176
1177         /* normal quirks */
1178         quirks = (unsigned long)id->driver_info;
1179
1180         if (quirks == IGNORE_DEVICE)
1181                 return -ENODEV;
1182
1183         memset(&h, 0x00, sizeof(struct usb_cdc_parsed_header));
1184
1185         num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1186
1187         /* handle quirks deadly to normal probing*/
1188         if (quirks == NO_UNION_NORMAL) {
1189                 data_interface = usb_ifnum_to_if(usb_dev, 1);
1190                 control_interface = usb_ifnum_to_if(usb_dev, 0);
1191                 /* we would crash */
1192                 if (!data_interface || !control_interface)
1193                         return -ENODEV;
1194                 goto skip_normal_probe;
1195         }
1196
1197         /* normal probing*/
1198         if (!buffer) {
1199                 dev_err(&intf->dev, "Weird descriptor references\n");
1200                 return -EINVAL;
1201         }
1202
1203         if (!intf->cur_altsetting)
1204                 return -EINVAL;
1205
1206         if (!buflen) {
1207                 if (intf->cur_altsetting->endpoint &&
1208                                 intf->cur_altsetting->endpoint->extralen &&
1209                                 intf->cur_altsetting->endpoint->extra) {
1210                         dev_dbg(&intf->dev,
1211                                 "Seeking extra descriptors on endpoint\n");
1212                         buflen = intf->cur_altsetting->endpoint->extralen;
1213                         buffer = intf->cur_altsetting->endpoint->extra;
1214                 } else {
1215                         dev_err(&intf->dev,
1216                                 "Zero length descriptor references\n");
1217                         return -EINVAL;
1218                 }
1219         }
1220
1221         cdc_parse_cdc_header(&h, intf, buffer, buflen);
1222         union_header = h.usb_cdc_union_desc;
1223         cmgmd = h.usb_cdc_call_mgmt_descriptor;
1224         if (cmgmd)
1225                 call_intf_num = cmgmd->bDataInterface;
1226
1227         if (!union_header) {
1228                 if (call_intf_num > 0) {
1229                         dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1230                         /* quirks for Droids MuIn LCD */
1231                         if (quirks & NO_DATA_INTERFACE) {
1232                                 data_interface = usb_ifnum_to_if(usb_dev, 0);
1233                         } else {
1234                                 data_intf_num = call_intf_num;
1235                                 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1236                         }
1237                         control_interface = intf;
1238                 } else {
1239                         if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1240                                 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1241                                 return -ENODEV;
1242                         } else {
1243                                 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1244                                 combined_interfaces = 1;
1245                                 control_interface = data_interface = intf;
1246                                 goto look_for_collapsed_interface;
1247                         }
1248                 }
1249         } else {
1250                 data_intf_num = union_header->bSlaveInterface0;
1251                 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1252                 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1253         }
1254
1255         if (!control_interface || !data_interface) {
1256                 dev_dbg(&intf->dev, "no interfaces\n");
1257                 return -ENODEV;
1258         }
1259         if (!data_interface->cur_altsetting || !control_interface->cur_altsetting)
1260                 return -ENODEV;
1261
1262         if (data_intf_num != call_intf_num)
1263                 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1264
1265         if (control_interface == data_interface) {
1266                 /* some broken devices designed for windows work this way */
1267                 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1268                 combined_interfaces = 1;
1269                 /* a popular other OS doesn't use it */
1270                 quirks |= NO_CAP_LINE;
1271                 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1272                         dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1273                         return -EINVAL;
1274                 }
1275 look_for_collapsed_interface:
1276                 for (i = 0; i < 3; i++) {
1277                         struct usb_endpoint_descriptor *ep;
1278                         ep = &data_interface->cur_altsetting->endpoint[i].desc;
1279
1280                         if (usb_endpoint_is_int_in(ep))
1281                                 epctrl = ep;
1282                         else if (usb_endpoint_is_bulk_out(ep))
1283                                 epwrite = ep;
1284                         else if (usb_endpoint_is_bulk_in(ep))
1285                                 epread = ep;
1286                         else
1287                                 return -EINVAL;
1288                 }
1289                 if (!epctrl || !epread || !epwrite)
1290                         return -ENODEV;
1291                 else
1292                         goto made_compressed_probe;
1293         }
1294
1295 skip_normal_probe:
1296
1297         /*workaround for switched interfaces */
1298         if (data_interface->cur_altsetting->desc.bInterfaceClass
1299                                                 != CDC_DATA_INTERFACE_TYPE) {
1300                 if (control_interface->cur_altsetting->desc.bInterfaceClass
1301                                                 == CDC_DATA_INTERFACE_TYPE) {
1302                         dev_dbg(&intf->dev,
1303                                 "Your device has switched interfaces.\n");
1304                         swap(control_interface, data_interface);
1305                 } else {
1306                         return -EINVAL;
1307                 }
1308         }
1309
1310         /* Accept probe requests only for the control interface */
1311         if (!combined_interfaces && intf != control_interface)
1312                 return -ENODEV;
1313
1314         if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1315                 /* valid in this context */
1316                 dev_dbg(&intf->dev, "The data interface isn't available\n");
1317                 return -EBUSY;
1318         }
1319
1320
1321         if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1322             control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1323                 return -EINVAL;
1324
1325         epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1326         epread = &data_interface->cur_altsetting->endpoint[0].desc;
1327         epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1328
1329
1330         /* workaround for switched endpoints */
1331         if (!usb_endpoint_dir_in(epread)) {
1332                 /* descriptors are swapped */
1333                 dev_dbg(&intf->dev,
1334                         "The data interface has switched endpoints\n");
1335                 swap(epread, epwrite);
1336         }
1337 made_compressed_probe:
1338         dev_dbg(&intf->dev, "interfaces are valid\n");
1339
1340         acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1341         if (acm == NULL)
1342                 goto alloc_fail;
1343
1344         minor = acm_alloc_minor(acm);
1345         if (minor < 0)
1346                 goto alloc_fail1;
1347
1348         ctrlsize = usb_endpoint_maxp(epctrl);
1349         readsize = usb_endpoint_maxp(epread) *
1350                                 (quirks == SINGLE_RX_URB ? 1 : 2);
1351         acm->combined_interfaces = combined_interfaces;
1352         acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1353         acm->control = control_interface;
1354         acm->data = data_interface;
1355         acm->minor = minor;
1356         acm->dev = usb_dev;
1357         if (h.usb_cdc_acm_descriptor)
1358                 acm->ctrl_caps = h.usb_cdc_acm_descriptor->bmCapabilities;
1359         if (quirks & NO_CAP_LINE)
1360                 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1361         acm->ctrlsize = ctrlsize;
1362         acm->readsize = readsize;
1363         acm->rx_buflimit = num_rx_buf;
1364         INIT_WORK(&acm->work, acm_softint);
1365         init_waitqueue_head(&acm->wioctl);
1366         spin_lock_init(&acm->write_lock);
1367         spin_lock_init(&acm->read_lock);
1368         mutex_init(&acm->mutex);
1369         if (usb_endpoint_xfer_int(epread)) {
1370                 acm->bInterval = epread->bInterval;
1371                 acm->in = usb_rcvintpipe(usb_dev, epread->bEndpointAddress);
1372         } else {
1373                 acm->in = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1374         }
1375         if (usb_endpoint_xfer_int(epwrite))
1376                 acm->out = usb_sndintpipe(usb_dev, epwrite->bEndpointAddress);
1377         else
1378                 acm->out = usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress);
1379         tty_port_init(&acm->port);
1380         acm->port.ops = &acm_port_ops;
1381         init_usb_anchor(&acm->delayed);
1382         acm->quirks = quirks;
1383
1384         buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1385         if (!buf)
1386                 goto alloc_fail2;
1387         acm->ctrl_buffer = buf;
1388
1389         if (acm_write_buffers_alloc(acm) < 0)
1390                 goto alloc_fail4;
1391
1392         acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1393         if (!acm->ctrlurb)
1394                 goto alloc_fail5;
1395
1396         for (i = 0; i < num_rx_buf; i++) {
1397                 struct acm_rb *rb = &(acm->read_buffers[i]);
1398                 struct urb *urb;
1399
1400                 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1401                                                                 &rb->dma);
1402                 if (!rb->base)
1403                         goto alloc_fail6;
1404                 rb->index = i;
1405                 rb->instance = acm;
1406
1407                 urb = usb_alloc_urb(0, GFP_KERNEL);
1408                 if (!urb)
1409                         goto alloc_fail6;
1410
1411                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1412                 urb->transfer_dma = rb->dma;
1413                 if (usb_endpoint_xfer_int(epread))
1414                         usb_fill_int_urb(urb, acm->dev, acm->in, rb->base,
1415                                          acm->readsize,
1416                                          acm_read_bulk_callback, rb,
1417                                          acm->bInterval);
1418                 else
1419                         usb_fill_bulk_urb(urb, acm->dev, acm->in, rb->base,
1420                                           acm->readsize,
1421                                           acm_read_bulk_callback, rb);
1422
1423                 acm->read_urbs[i] = urb;
1424                 __set_bit(i, &acm->read_urbs_free);
1425         }
1426         for (i = 0; i < ACM_NW; i++) {
1427                 struct acm_wb *snd = &(acm->wb[i]);
1428
1429                 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1430                 if (snd->urb == NULL)
1431                         goto alloc_fail7;
1432
1433                 if (usb_endpoint_xfer_int(epwrite))
1434                         usb_fill_int_urb(snd->urb, usb_dev, acm->out,
1435                                 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1436                 else
1437                         usb_fill_bulk_urb(snd->urb, usb_dev, acm->out,
1438                                 NULL, acm->writesize, acm_write_bulk, snd);
1439                 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1440                 if (quirks & SEND_ZERO_PACKET)
1441                         snd->urb->transfer_flags |= URB_ZERO_PACKET;
1442                 snd->instance = acm;
1443         }
1444
1445         usb_set_intfdata(intf, acm);
1446
1447         i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1448         if (i < 0)
1449                 goto alloc_fail7;
1450
1451         if (h.usb_cdc_country_functional_desc) { /* export the country data */
1452                 struct usb_cdc_country_functional_desc * cfd =
1453                                         h.usb_cdc_country_functional_desc;
1454
1455                 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1456                 if (!acm->country_codes)
1457                         goto skip_countries;
1458                 acm->country_code_size = cfd->bLength - 4;
1459                 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1460                                                         cfd->bLength - 4);
1461                 acm->country_rel_date = cfd->iCountryCodeRelDate;
1462
1463                 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1464                 if (i < 0) {
1465                         kfree(acm->country_codes);
1466                         acm->country_codes = NULL;
1467                         acm->country_code_size = 0;
1468                         goto skip_countries;
1469                 }
1470
1471                 i = device_create_file(&intf->dev,
1472                                                 &dev_attr_iCountryCodeRelDate);
1473                 if (i < 0) {
1474                         device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1475                         kfree(acm->country_codes);
1476                         acm->country_codes = NULL;
1477                         acm->country_code_size = 0;
1478                         goto skip_countries;
1479                 }
1480         }
1481
1482 skip_countries:
1483         usb_fill_int_urb(acm->ctrlurb, usb_dev,
1484                          usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1485                          acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1486                          /* works around buggy devices */
1487                          epctrl->bInterval ? epctrl->bInterval : 16);
1488         acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1489         acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1490
1491         dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1492
1493         acm->line.dwDTERate = cpu_to_le32(9600);
1494         acm->line.bDataBits = 8;
1495         acm_set_line(acm, &acm->line);
1496
1497         usb_driver_claim_interface(&acm_driver, data_interface, acm);
1498         usb_set_intfdata(data_interface, acm);
1499
1500         usb_get_intf(control_interface);
1501         tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1502                         &control_interface->dev);
1503         if (IS_ERR(tty_dev)) {
1504                 rv = PTR_ERR(tty_dev);
1505                 goto alloc_fail8;
1506         }
1507
1508         if (quirks & CLEAR_HALT_CONDITIONS) {
1509                 usb_clear_halt(usb_dev, acm->in);
1510                 usb_clear_halt(usb_dev, acm->out);
1511         }
1512
1513         return 0;
1514 alloc_fail8:
1515         if (acm->country_codes) {
1516                 device_remove_file(&acm->control->dev,
1517                                 &dev_attr_wCountryCodes);
1518                 device_remove_file(&acm->control->dev,
1519                                 &dev_attr_iCountryCodeRelDate);
1520                 kfree(acm->country_codes);
1521         }
1522         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1523 alloc_fail7:
1524         usb_set_intfdata(intf, NULL);
1525         for (i = 0; i < ACM_NW; i++)
1526                 usb_free_urb(acm->wb[i].urb);
1527 alloc_fail6:
1528         for (i = 0; i < num_rx_buf; i++)
1529                 usb_free_urb(acm->read_urbs[i]);
1530         acm_read_buffers_free(acm);
1531         usb_free_urb(acm->ctrlurb);
1532 alloc_fail5:
1533         acm_write_buffers_free(acm);
1534 alloc_fail4:
1535         usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1536 alloc_fail2:
1537         acm_release_minor(acm);
1538 alloc_fail1:
1539         kfree(acm);
1540 alloc_fail:
1541         return rv;
1542 }
1543
1544 static void acm_disconnect(struct usb_interface *intf)
1545 {
1546         struct acm *acm = usb_get_intfdata(intf);
1547         struct tty_struct *tty;
1548
1549         /* sibling interface is already cleaning up */
1550         if (!acm)
1551                 return;
1552
1553         mutex_lock(&acm->mutex);
1554         acm->disconnected = true;
1555         if (acm->country_codes) {
1556                 device_remove_file(&acm->control->dev,
1557                                 &dev_attr_wCountryCodes);
1558                 device_remove_file(&acm->control->dev,
1559                                 &dev_attr_iCountryCodeRelDate);
1560         }
1561         wake_up_all(&acm->wioctl);
1562         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1563         usb_set_intfdata(acm->control, NULL);
1564         usb_set_intfdata(acm->data, NULL);
1565         mutex_unlock(&acm->mutex);
1566
1567         tty = tty_port_tty_get(&acm->port);
1568         if (tty) {
1569                 tty_vhangup(tty);
1570                 tty_kref_put(tty);
1571         }
1572
1573         acm_kill_urbs(acm);
1574         cancel_work_sync(&acm->work);
1575
1576         tty_unregister_device(acm_tty_driver, acm->minor);
1577
1578         acm_write_buffers_free(acm);
1579         usb_free_coherent(acm->dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1580         acm_read_buffers_free(acm);
1581
1582         if (!acm->combined_interfaces)
1583                 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1584                                         acm->data : acm->control);
1585
1586         tty_port_put(&acm->port);
1587 }
1588
1589 #ifdef CONFIG_PM
1590 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1591 {
1592         struct acm *acm = usb_get_intfdata(intf);
1593         int cnt;
1594
1595         spin_lock_irq(&acm->write_lock);
1596         if (PMSG_IS_AUTO(message)) {
1597                 if (acm->transmitting) {
1598                         spin_unlock_irq(&acm->write_lock);
1599                         return -EBUSY;
1600                 }
1601         }
1602         cnt = acm->susp_count++;
1603         spin_unlock_irq(&acm->write_lock);
1604
1605         if (cnt)
1606                 return 0;
1607
1608         acm_kill_urbs(acm);
1609         cancel_work_sync(&acm->work);
1610
1611         return 0;
1612 }
1613
1614 static int acm_resume(struct usb_interface *intf)
1615 {
1616         struct acm *acm = usb_get_intfdata(intf);
1617         struct urb *urb;
1618         int rv = 0;
1619
1620         spin_lock_irq(&acm->write_lock);
1621
1622         if (--acm->susp_count)
1623                 goto out;
1624
1625         if (tty_port_initialized(&acm->port)) {
1626                 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1627
1628                 for (;;) {
1629                         urb = usb_get_from_anchor(&acm->delayed);
1630                         if (!urb)
1631                                 break;
1632
1633                         acm_start_wb(acm, urb->context);
1634                 }
1635
1636                 /*
1637                  * delayed error checking because we must
1638                  * do the write path at all cost
1639                  */
1640                 if (rv < 0)
1641                         goto out;
1642
1643                 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1644         }
1645 out:
1646         spin_unlock_irq(&acm->write_lock);
1647
1648         return rv;
1649 }
1650
1651 static int acm_reset_resume(struct usb_interface *intf)
1652 {
1653         struct acm *acm = usb_get_intfdata(intf);
1654
1655         if (tty_port_initialized(&acm->port))
1656                 tty_port_tty_hangup(&acm->port, false);
1657
1658         return acm_resume(intf);
1659 }
1660
1661 #endif /* CONFIG_PM */
1662
1663 static int acm_pre_reset(struct usb_interface *intf)
1664 {
1665         struct acm *acm = usb_get_intfdata(intf);
1666
1667         clear_bit(EVENT_RX_STALL, &acm->flags);
1668
1669         return 0;
1670 }
1671
1672 #define NOKIA_PCSUITE_ACM_INFO(x) \
1673                 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1674                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1675                 USB_CDC_ACM_PROTO_VENDOR)
1676
1677 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1678                 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1679                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1680                 USB_CDC_ACM_PROTO_VENDOR)
1681
1682 /*
1683  * USB driver structure.
1684  */
1685
1686 static const struct usb_device_id acm_ids[] = {
1687         /* quirky and broken devices */
1688         { USB_DEVICE(0x076d, 0x0006), /* Denso Cradle CU-321 */
1689         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1690         { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1691         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1692         { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1693         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1694         },
1695         { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1696         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1697         },
1698         { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1699         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1700         },
1701         { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1702         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1703         },
1704         { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1705         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1706         },
1707         { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1708         .driver_info = SINGLE_RX_URB,
1709         },
1710         { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1711         .driver_info = SINGLE_RX_URB, /* firmware bug */
1712         },
1713         { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1714         .driver_info = SINGLE_RX_URB, /* firmware bug */
1715         },
1716         { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1717         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1718         },
1719         { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1720         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1721         },
1722         { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1723         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1724         },
1725         { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1726         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1727         },
1728         { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1729         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1730         },
1731         { USB_DEVICE(0x20df, 0x0001), /* Simtec Electronics Entropy Key */
1732         .driver_info = QUIRK_CONTROL_LINE_STATE, },
1733         { USB_DEVICE(0x2184, 0x001c) }, /* GW Instek AFG-2225 */
1734         { USB_DEVICE(0x2184, 0x0036) }, /* GW Instek AFG-125 */
1735         { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1736         },
1737         /* Motorola H24 HSPA module: */
1738         { USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1739         { USB_DEVICE(0x22b8, 0x2d92),   /* modem           + diagnostics        */
1740         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1741         },
1742         { USB_DEVICE(0x22b8, 0x2d93),   /* modem + AT port                      */
1743         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1744         },
1745         { USB_DEVICE(0x22b8, 0x2d95),   /* modem + AT port + diagnostics        */
1746         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1747         },
1748         { USB_DEVICE(0x22b8, 0x2d96),   /* modem                         + NMEA */
1749         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1750         },
1751         { USB_DEVICE(0x22b8, 0x2d97),   /* modem           + diagnostics + NMEA */
1752         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1753         },
1754         { USB_DEVICE(0x22b8, 0x2d99),   /* modem + AT port               + NMEA */
1755         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1756         },
1757         { USB_DEVICE(0x22b8, 0x2d9a),   /* modem + AT port + diagnostics + NMEA */
1758         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1759         },
1760
1761         { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1762         .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1763                                            data interface instead of
1764                                            communications interface.
1765                                            Maybe we should define a new
1766                                            quirk for this. */
1767         },
1768         { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1769         .driver_info = NO_UNION_NORMAL,
1770         },
1771         { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1772         .driver_info = NO_UNION_NORMAL,
1773         },
1774         { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1775         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1776         },
1777         { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1778         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1779         },
1780
1781         { USB_DEVICE(0x2912, 0x0001), /* ATOL FPrint */
1782         .driver_info = CLEAR_HALT_CONDITIONS,
1783         },
1784
1785         /* Nokia S60 phones expose two ACM channels. The first is
1786          * a modem and is picked up by the standard AT-command
1787          * information below. The second is 'vendor-specific' but
1788          * is treated as a serial device at the S60 end, so we want
1789          * to expose it on Linux too. */
1790         { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1791         { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1792         { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1793         { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1794         { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1795         { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1796         { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1797         { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1798         { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1799         { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1800         { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1801         { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1802         { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1803         { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1804         { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1805         { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1806         { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1807         { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1808         { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1809         { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1810         { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1811         { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1812         { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1813         { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1814         { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1815         { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1816         { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1817         { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1818         { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1819         { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1820         { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1821         { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
1822         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1823         { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1824         { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1825         { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1826         { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1827         { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1828         { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1829         { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1830         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1831         { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1832         { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1833         { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1834         { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1835         { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1836         { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1837         { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1838         { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1839         { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1840         { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1841         { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1842         { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1843         { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1844         { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1845         { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1846         { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1847         { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1848
1849         /* Support for Owen devices */
1850         { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1851
1852         /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1853
1854         /* Support for Droids MuIn LCD */
1855         { USB_DEVICE(0x04d8, 0x000b),
1856         .driver_info = NO_DATA_INTERFACE,
1857         },
1858
1859 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1860         { USB_DEVICE(0x04d8, 0x0082),   /* Application mode */
1861         .driver_info = IGNORE_DEVICE,
1862         },
1863         { USB_DEVICE(0x04d8, 0x0083),   /* Bootloader mode */
1864         .driver_info = IGNORE_DEVICE,
1865         },
1866 #endif
1867
1868         /*Samsung phone in firmware update mode */
1869         { USB_DEVICE(0x04e8, 0x685d),
1870         .driver_info = IGNORE_DEVICE,
1871         },
1872
1873         /* Exclude Infineon Flash Loader utility */
1874         { USB_DEVICE(0x058b, 0x0041),
1875         .driver_info = IGNORE_DEVICE,
1876         },
1877
1878         /* control interfaces without any protocol set */
1879         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1880                 USB_CDC_PROTO_NONE) },
1881
1882         /* control interfaces with various AT-command sets */
1883         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1884                 USB_CDC_ACM_PROTO_AT_V25TER) },
1885         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1886                 USB_CDC_ACM_PROTO_AT_PCCA101) },
1887         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1888                 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1889         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1890                 USB_CDC_ACM_PROTO_AT_GSM) },
1891         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1892                 USB_CDC_ACM_PROTO_AT_3G) },
1893         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1894                 USB_CDC_ACM_PROTO_AT_CDMA) },
1895
1896         { USB_DEVICE(0x1519, 0x0452), /* Intel 7260 modem */
1897         .driver_info = SEND_ZERO_PACKET,
1898         },
1899
1900         { }
1901 };
1902
1903 MODULE_DEVICE_TABLE(usb, acm_ids);
1904
1905 static struct usb_driver acm_driver = {
1906         .name =         "cdc_acm",
1907         .probe =        acm_probe,
1908         .disconnect =   acm_disconnect,
1909 #ifdef CONFIG_PM
1910         .suspend =      acm_suspend,
1911         .resume =       acm_resume,
1912         .reset_resume = acm_reset_resume,
1913 #endif
1914         .pre_reset =    acm_pre_reset,
1915         .id_table =     acm_ids,
1916 #ifdef CONFIG_PM
1917         .supports_autosuspend = 1,
1918 #endif
1919         .disable_hub_initiated_lpm = 1,
1920 };
1921
1922 /*
1923  * TTY driver structures.
1924  */
1925
1926 static const struct tty_operations acm_ops = {
1927         .install =              acm_tty_install,
1928         .open =                 acm_tty_open,
1929         .close =                acm_tty_close,
1930         .cleanup =              acm_tty_cleanup,
1931         .hangup =               acm_tty_hangup,
1932         .write =                acm_tty_write,
1933         .put_char =             acm_tty_put_char,
1934         .flush_chars =          acm_tty_flush_chars,
1935         .write_room =           acm_tty_write_room,
1936         .ioctl =                acm_tty_ioctl,
1937         .throttle =             acm_tty_throttle,
1938         .unthrottle =           acm_tty_unthrottle,
1939         .chars_in_buffer =      acm_tty_chars_in_buffer,
1940         .break_ctl =            acm_tty_break_ctl,
1941         .set_termios =          acm_tty_set_termios,
1942         .tiocmget =             acm_tty_tiocmget,
1943         .tiocmset =             acm_tty_tiocmset,
1944         .get_icount =           acm_tty_get_icount,
1945 };
1946
1947 /*
1948  * Init / exit.
1949  */
1950
1951 static int __init acm_init(void)
1952 {
1953         int retval;
1954         acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1955         if (!acm_tty_driver)
1956                 return -ENOMEM;
1957         acm_tty_driver->driver_name = "acm",
1958         acm_tty_driver->name = "ttyACM",
1959         acm_tty_driver->major = ACM_TTY_MAJOR,
1960         acm_tty_driver->minor_start = 0,
1961         acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1962         acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1963         acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1964         acm_tty_driver->init_termios = tty_std_termios;
1965         acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1966                                                                 HUPCL | CLOCAL;
1967         tty_set_operations(acm_tty_driver, &acm_ops);
1968
1969         retval = tty_register_driver(acm_tty_driver);
1970         if (retval) {
1971                 put_tty_driver(acm_tty_driver);
1972                 return retval;
1973         }
1974
1975         retval = usb_register(&acm_driver);
1976         if (retval) {
1977                 tty_unregister_driver(acm_tty_driver);
1978                 put_tty_driver(acm_tty_driver);
1979                 return retval;
1980         }
1981
1982         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1983
1984         return 0;
1985 }
1986
1987 static void __exit acm_exit(void)
1988 {
1989         usb_deregister(&acm_driver);
1990         tty_unregister_driver(acm_tty_driver);
1991         put_tty_driver(acm_tty_driver);
1992         idr_destroy(&acm_minors);
1993 }
1994
1995 module_init(acm_init);
1996 module_exit(acm_exit);
1997
1998 MODULE_AUTHOR(DRIVER_AUTHOR);
1999 MODULE_DESCRIPTION(DRIVER_DESC);
2000 MODULE_LICENSE("GPL");
2001 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);