drivers/usb/class/cdc-acm.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * cdc-acm.c
   4  *
   5  * Copyright (c) 1999 Armin Fuerst      <fuerst@in.tum.de>
   6  * Copyright (c) 1999 Pavel Machek      <pavel@ucw.cz>
   7  * Copyright (c) 1999 Johannes Erdfelt  <johannes@erdfelt.com>
   8  * Copyright (c) 2000 Vojtech Pavlik    <vojtech@suse.cz>
   9  * Copyright (c) 2004 Oliver Neukum     <oliver@neukum.name>
  10  * Copyright (c) 2005 David Kubicek     <dave@awk.cz>
  11  * Copyright (c) 2011 Johan Hovold      <jhovold@gmail.com>
  12  *
  13  * USB Abstract Control Model driver for USB modems and ISDN adapters
  14  *
  15  * Sponsored by SuSE
  16  */
  17
  18 #undef DEBUG
  19 #undef VERBOSE_DEBUG
  20
  21 #include <linux/kernel.h>
  22 #include <linux/sched/signal.h>
  23 #include <linux/errno.h>
  24 #include <linux/init.h>
  25 #include <linux/slab.h>
  26 #include <linux/log2.h>
  27 #include <linux/tty.h>
  28 #include <linux/serial.h>
  29 #include <linux/tty_driver.h>
  30 #include <linux/tty_flip.h>
  31 #include <linux/module.h>
  32 #include <linux/mutex.h>
  33 #include <linux/uaccess.h>
  34 #include <linux/usb.h>
  35 #include <linux/usb/cdc.h>
  36 #include <asm/byteorder.h>
  37 #include <asm/unaligned.h>
  38 #include <linux/idr.h>
  39 #include <linux/list.h>
  40
  41 #include "cdc-acm.h"
  42
  43
  44 #define DRIVER_AUTHOR "Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik, David Kubicek, Johan Hovold"
  45 #define DRIVER_DESC "USB Abstract Control Model driver for USB modems and ISDN adapters"
  46
  47 static struct usb_driver acm_driver;
  48 static struct tty_driver *acm_tty_driver;
  49
  50 static DEFINE_IDR(acm_minors);
  51 static DEFINE_MUTEX(acm_minors_lock);
  52
  53 static void acm_tty_set_termios(struct tty_struct *tty,
  54                                 struct ktermios *termios_old);
  55
  56 /*
  57  * acm_minors accessors
  58  */
  59
  60 /*
  61  * Look up an ACM structure by minor. If found and not disconnected, increment
  62  * its refcount and return it with its mutex held.
  63  */
  64 static struct acm *acm_get_by_minor(unsigned int minor)
  65 {
  66         struct acm *acm;
  67
  68         mutex_lock(&acm_minors_lock);
  69         acm = idr_find(&acm_minors, minor);
  70         if (acm) {
  71                 mutex_lock(&acm->mutex);
  72                 if (acm->disconnected) {
  73                         mutex_unlock(&acm->mutex);
  74                         acm = NULL;
  75                 } else {
  76                         tty_port_get(&acm->port);
  77                         mutex_unlock(&acm->mutex);
  78                 }
  79         }
  80         mutex_unlock(&acm_minors_lock);
  81         return acm;
  82 }
  83
  84 /*
  85  * Try to find an available minor number and if found, associate it with 'acm'.
  86  */
  87 static int acm_alloc_minor(struct acm *acm)
  88 {
  89         int minor;
  90
  91         mutex_lock(&acm_minors_lock);
  92         minor = idr_alloc(&acm_minors, acm, 0, ACM_TTY_MINORS, GFP_KERNEL);
  93         mutex_unlock(&acm_minors_lock);
  94
  95         return minor;
  96 }
  97
  98 /* Release the minor number associated with 'acm'.  */
  99 static void acm_release_minor(struct acm *acm)
 100 {
 101         mutex_lock(&acm_minors_lock);
 102         idr_remove(&acm_minors, acm->minor);
 103         mutex_unlock(&acm_minors_lock);
 104 }
 105
 106 /*
 107  * Functions for ACM control messages.
 108  */
 109
 110 static int acm_ctrl_msg(struct acm *acm, int request, int value,
 111                                                         void *buf, int len)
 112 {
 113         int retval;
 114
 115         retval = usb_autopm_get_interface(acm->control);
 116         if (retval)
 117                 return retval;
 118
 119         retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
 120                 request, USB_RT_ACM, value,
 121                 acm->control->altsetting[0].desc.bInterfaceNumber,
 122                 buf, len, 5000);
 123
 124         dev_dbg(&acm->control->dev,
 125                 "%s - rq 0x%02x, val %#x, len %#x, result %d\n",
 126                 __func__, request, value, len, retval);
 127
 128         usb_autopm_put_interface(acm->control);
 129
 130         return retval < 0 ? retval : 0;
 131 }
 132
 133 /* devices aren't required to support these requests.
 134  * the cdc acm descriptor tells whether they do...
 135  */
 136 static inline int acm_set_control(struct acm *acm, int control)
 137 {
 138         if (acm->quirks & QUIRK_CONTROL_LINE_STATE)
 139                 return -EOPNOTSUPP;
 140
 141         return acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE,
 142                         control, NULL, 0);
 143 }
 144
 145 #define acm_set_line(acm, line) \
 146         acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
 147 #define acm_send_break(acm, ms) \
 148         acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)
 149
 150 static void acm_kill_urbs(struct acm *acm)
 151 {
 152         int i;
 153
 154         usb_kill_urb(acm->ctrlurb);
 155         for (i = 0; i < ACM_NW; i++)
 156                 usb_kill_urb(acm->wb[i].urb);
 157         for (i = 0; i < acm->rx_buflimit; i++)
 158                 usb_kill_urb(acm->read_urbs[i]);
 159 }
 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                         wb->len = 0;
 178                         return wbn;
 179                 }
 180                 wbn = (wbn + 1) % ACM_NW;
 181                 if (++i >= ACM_NW)
 182                         return -1;
 183         }
 184 }
 185
 186 static int acm_wb_is_avail(struct acm *acm)
 187 {
 188         int i, n;
 189         unsigned long flags;
 190
 191         n = ACM_NW;
 192         spin_lock_irqsave(&acm->write_lock, flags);
 193         for (i = 0; i < ACM_NW; i++)
 194                 n -= acm->wb[i].use;
 195         spin_unlock_irqrestore(&acm->write_lock, flags);
 196         return n;
 197 }
 198
 199 /*
 200  * Finish write. Caller must hold acm->write_lock
 201  */
 202 static void acm_write_done(struct acm *acm, struct acm_wb *wb)
 203 {
 204         wb->use = 0;
 205         acm->transmitting--;
 206         usb_autopm_put_interface_async(acm->control);
 207 }
 208
 209 /*
 210  * Poke write.
 211  *
 212  * the caller is responsible for locking
 213  */
 214
 215 static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
 216 {
 217         int rc;
 218
 219         acm->transmitting++;
 220
 221         wb->urb->transfer_buffer = wb->buf;
 222         wb->urb->transfer_dma = wb->dmah;
 223         wb->urb->transfer_buffer_length = wb->len;
 224         wb->urb->dev = acm->dev;
 225
 226         rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
 227         if (rc < 0) {
 228                 dev_err(&acm->data->dev,
 229                         "%s - usb_submit_urb(write bulk) failed: %d\n",
 230                         __func__, rc);
 231                 acm_write_done(acm, wb);
 232         }
 233         return rc;
 234 }
 235
 236 /*
 237  * attributes exported through sysfs
 238  */
 239 static ssize_t bmCapabilities_show
 240 (struct device *dev, struct device_attribute *attr, char *buf)
 241 {
 242         struct usb_interface *intf = to_usb_interface(dev);
 243         struct acm *acm = usb_get_intfdata(intf);
 244
 245         return sprintf(buf, "%d", acm->ctrl_caps);
 246 }
 247 static DEVICE_ATTR_RO(bmCapabilities);
 248
 249 static ssize_t wCountryCodes_show
 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         memcpy(buf, acm->country_codes, acm->country_code_size);
 256         return acm->country_code_size;
 257 }
 258
 259 static DEVICE_ATTR_RO(wCountryCodes);
 260
 261 static ssize_t iCountryCodeRelDate_show
 262 (struct device *dev, struct device_attribute *attr, char *buf)
 263 {
 264         struct usb_interface *intf = to_usb_interface(dev);
 265         struct acm *acm = usb_get_intfdata(intf);
 266
 267         return sprintf(buf, "%d", acm->country_rel_date);
 268 }
 269
 270 static DEVICE_ATTR_RO(iCountryCodeRelDate);
 271 /*
 272  * Interrupt handlers for various ACM device responses
 273  */
 274
 275 static void acm_process_notification(struct acm *acm, unsigned char *buf)
 276 {
 277         int newctrl;
 278         int difference;
 279         unsigned long flags;
 280         struct usb_cdc_notification *dr = (struct usb_cdc_notification *)buf;
 281         unsigned char *data = buf + sizeof(struct usb_cdc_notification);
 282
 283         switch (dr->bNotificationType) {
 284         case USB_CDC_NOTIFY_NETWORK_CONNECTION:
 285                 dev_dbg(&acm->control->dev,
 286                         "%s - network connection: %d\n", __func__, dr->wValue);
 287                 break;
 288
 289         case USB_CDC_NOTIFY_SERIAL_STATE:
 290                 if (le16_to_cpu(dr->wLength) != 2) {
 291                         dev_dbg(&acm->control->dev,
 292                                 "%s - malformed serial state\n", __func__);
 293                         break;
 294                 }
 295
 296                 newctrl = get_unaligned_le16(data);
 297                 dev_dbg(&acm->control->dev,
 298                         "%s - serial state: 0x%x\n", __func__, newctrl);
 299
 300                 if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
 301                         dev_dbg(&acm->control->dev,
 302                                 "%s - calling hangup\n", __func__);
 303                         tty_port_tty_hangup(&acm->port, false);
 304                 }
 305
 306                 difference = acm->ctrlin ^ newctrl;
 307                 spin_lock_irqsave(&acm->read_lock, flags);
 308                 acm->ctrlin = newctrl;
 309                 acm->oldcount = acm->iocount;
 310
 311                 if (difference & ACM_CTRL_DSR)
 312                         acm->iocount.dsr++;
 313                 if (difference & ACM_CTRL_DCD)
 314                         acm->iocount.dcd++;
 315                 if (newctrl & ACM_CTRL_BRK)
 316                         acm->iocount.brk++;
 317                 if (newctrl & ACM_CTRL_RI)
 318                         acm->iocount.rng++;
 319                 if (newctrl & ACM_CTRL_FRAMING)
 320                         acm->iocount.frame++;
 321                 if (newctrl & ACM_CTRL_PARITY)
 322                         acm->iocount.parity++;
 323                 if (newctrl & ACM_CTRL_OVERRUN)
 324                         acm->iocount.overrun++;
 325                 spin_unlock_irqrestore(&acm->read_lock, flags);
 326
 327                 if (difference)
 328                         wake_up_all(&acm->wioctl);
 329
 330                 break;
 331
 332         default:
 333                 dev_dbg(&acm->control->dev,
 334                         "%s - unknown notification %d received: index %d len %d\n",
 335                         __func__,
 336                         dr->bNotificationType, dr->wIndex, dr->wLength);
 337         }
 338 }
 339
 340 /* control interface reports status changes with "interrupt" transfers */
 341 static void acm_ctrl_irq(struct urb *urb)
 342 {
 343         struct acm *acm = urb->context;
 344         struct usb_cdc_notification *dr = urb->transfer_buffer;
 345         unsigned int current_size = urb->actual_length;
 346         unsigned int expected_size, copy_size, alloc_size;
 347         int retval;
 348         int status = urb->status;
 349
 350         switch (status) {
 351         case 0:
 352                 /* success */
 353                 break;
 354         case -ECONNRESET:
 355         case -ENOENT:
 356         case -ESHUTDOWN:
 357                 /* this urb is terminated, clean up */
 358                 dev_dbg(&acm->control->dev,
 359                         "%s - urb shutting down with status: %d\n",
 360                         __func__, status);
 361                 return;
 362         default:
 363                 dev_dbg(&acm->control->dev,
 364                         "%s - nonzero urb status received: %d\n",
 365                         __func__, status);
 366                 goto exit;
 367         }
 368
 369         usb_mark_last_busy(acm->dev);
 370
 371         if (acm->nb_index)
 372                 dr = (struct usb_cdc_notification *)acm->notification_buffer;
 373
 374         /* size = notification-header + (optional) data */
 375         expected_size = sizeof(struct usb_cdc_notification) +
 376                                         le16_to_cpu(dr->wLength);
 377
 378         if (current_size < expected_size) {
 379                 /* notification is transmitted fragmented, reassemble */
 380                 if (acm->nb_size < expected_size) {
 381                         if (acm->nb_size) {
 382                                 kfree(acm->notification_buffer);
 383                                 acm->nb_size = 0;
 384                         }
 385                         alloc_size = roundup_pow_of_two(expected_size);
 386                         /*
 387                          * kmalloc ensures a valid notification_buffer after a
 388                          * use of kfree in case the previous allocation was too
 389                          * small. Final freeing is done on disconnect.
 390                          */
 391                         acm->notification_buffer =
 392                                 kmalloc(alloc_size, GFP_ATOMIC);
 393                         if (!acm->notification_buffer)
 394                                 goto exit;
 395                         acm->nb_size = alloc_size;
 396                 }
 397
 398                 copy_size = min(current_size,
 399                                 expected_size - acm->nb_index);
 400
 401                 memcpy(&acm->notification_buffer[acm->nb_index],
 402                        urb->transfer_buffer, copy_size);
 403                 acm->nb_index += copy_size;
 404                 current_size = acm->nb_index;
 405         }
 406
 407         if (current_size >= expected_size) {
 408                 /* notification complete */
 409                 acm_process_notification(acm, (unsigned char *)dr);
 410                 acm->nb_index = 0;
 411         }
 412
 413 exit:
 414         retval = usb_submit_urb(urb, GFP_ATOMIC);
 415         if (retval && retval != -EPERM)
 416                 dev_err(&acm->control->dev,
 417                         "%s - usb_submit_urb failed: %d\n", __func__, retval);
 418 }
 419
 420 static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
 421 {
 422         int res;
 423
 424         if (!test_and_clear_bit(index, &acm->read_urbs_free))
 425                 return 0;
 426
 427         res = usb_submit_urb(acm->read_urbs[index], mem_flags);
 428         if (res) {
 429                 if (res != -EPERM && res != -ENODEV) {
 430                         dev_err(&acm->data->dev,
 431                                 "urb %d failed submission with %d\n",
 432                                 index, res);
 433                 }
 434                 set_bit(index, &acm->read_urbs_free);
 435                 return res;
 436         } else {
 437                 dev_vdbg(&acm->data->dev, "submitted urb %d\n", index);
 438         }
 439
 440         return 0;
 441 }
 442
 443 static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
 444 {
 445         int res;
 446         int i;
 447
 448         for (i = 0; i < acm->rx_buflimit; ++i) {
 449                 res = acm_submit_read_urb(acm, i, mem_flags);
 450                 if (res)
 451                         return res;
 452         }
 453
 454         return 0;
 455 }
 456
 457 static void acm_process_read_urb(struct acm *acm, struct urb *urb)
 458 {
 459         if (!urb->actual_length)
 460                 return;
 461
 462         tty_insert_flip_string(&acm->port, urb->transfer_buffer,
 463                         urb->actual_length);
 464         tty_flip_buffer_push(&acm->port);
 465 }
 466
 467 static void acm_read_bulk_callback(struct urb *urb)
 468 {
 469         struct acm_rb *rb = urb->context;
 470         struct acm *acm = rb->instance;
 471         unsigned long flags;
 472         int status = urb->status;
 473
 474         dev_vdbg(&acm->data->dev, "got urb %d, len %d, status %d\n",
 475                 rb->index, urb->actual_length, status);
 476
 477         set_bit(rb->index, &acm->read_urbs_free);
 478
 479         if (!acm->dev) {
 480                 dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
 481                 return;
 482         }
 483
 484         switch (status) {
 485         case 0:
 486                 usb_mark_last_busy(acm->dev);
 487                 acm_process_read_urb(acm, urb);
 488                 break;
 489         case -EPIPE:
 490                 set_bit(EVENT_RX_STALL, &acm->flags);
 491                 schedule_work(&acm->work);
 492                 return;
 493         case -ENOENT:
 494         case -ECONNRESET:
 495         case -ESHUTDOWN:
 496                 dev_dbg(&acm->data->dev,
 497                         "%s - urb shutting down with status: %d\n",
 498                         __func__, status);
 499                 return;
 500         default:
 501                 dev_dbg(&acm->data->dev,
 502                         "%s - nonzero urb status received: %d\n",
 503                         __func__, status);
 504                 break;
 505         }
 506
 507         /*
 508          * Unthrottle may run on another CPU which needs to see events
 509          * in the same order. Submission has an implict barrier
 510          */
 511         smp_mb__before_atomic();
 512
 513         /* throttle device if requested by tty */
 514         spin_lock_irqsave(&acm->read_lock, flags);
 515         acm->throttled = acm->throttle_req;
 516         if (!acm->throttled) {
 517                 spin_unlock_irqrestore(&acm->read_lock, flags);
 518                 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
 519         } else {
 520                 spin_unlock_irqrestore(&acm->read_lock, flags);
 521         }
 522 }
 523
 524 /* data interface wrote those outgoing bytes */
 525 static void acm_write_bulk(struct urb *urb)
 526 {
 527         struct acm_wb *wb = urb->context;
 528         struct acm *acm = wb->instance;
 529         unsigned long flags;
 530         int status = urb->status;
 531
 532         if (status || (urb->actual_length != urb->transfer_buffer_length))
 533                 dev_vdbg(&acm->data->dev, "wrote len %d/%d, status %d\n",
 534                         urb->actual_length,
 535                         urb->transfer_buffer_length,
 536                         status);
 537
 538         spin_lock_irqsave(&acm->write_lock, flags);
 539         acm_write_done(acm, wb);
 540         spin_unlock_irqrestore(&acm->write_lock, flags);
 541         set_bit(EVENT_TTY_WAKEUP, &acm->flags);
 542         schedule_work(&acm->work);
 543 }
 544
 545 static void acm_softint(struct work_struct *work)
 546 {
 547         int i;
 548         struct acm *acm = container_of(work, struct acm, work);
 549
 550         if (test_bit(EVENT_RX_STALL, &acm->flags)) {
 551                 if (!(usb_autopm_get_interface(acm->data))) {
 552                         for (i = 0; i < acm->rx_buflimit; i++)
 553                                 usb_kill_urb(acm->read_urbs[i]);
 554                         usb_clear_halt(acm->dev, acm->in);
 555                         acm_submit_read_urbs(acm, GFP_KERNEL);
 556                         usb_autopm_put_interface(acm->data);
 557                 }
 558                 clear_bit(EVENT_RX_STALL, &acm->flags);
 559         }
 560
 561         if (test_bit(EVENT_TTY_WAKEUP, &acm->flags)) {
 562                 tty_port_tty_wakeup(&acm->port);
 563                 clear_bit(EVENT_TTY_WAKEUP, &acm->flags);
 564         }
 565 }
 566
 567 /*
 568  * TTY handlers
 569  */
 570
 571 static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
 572 {
 573         struct acm *acm;
 574         int retval;
 575
 576         acm = acm_get_by_minor(tty->index);
 577         if (!acm)
 578                 return -ENODEV;
 579
 580         retval = tty_standard_install(driver, tty);
 581         if (retval)
 582                 goto error_init_termios;
 583
 584         tty->driver_data = acm;
 585
 586         return 0;
 587
 588 error_init_termios:
 589         tty_port_put(&acm->port);
 590         return retval;
 591 }
 592
 593 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
 594 {
 595         struct acm *acm = tty->driver_data;
 596
 597         return tty_port_open(&acm->port, tty, filp);
 598 }
 599
 600 static void acm_port_dtr_rts(struct tty_port *port, int raise)
 601 {
 602         struct acm *acm = container_of(port, struct acm, port);
 603         int val;
 604         int res;
 605
 606         if (raise)
 607                 val = ACM_CTRL_DTR | ACM_CTRL_RTS;
 608         else
 609                 val = 0;
 610
 611         /* FIXME: add missing ctrlout locking throughout driver */
 612         acm->ctrlout = val;
 613
 614         res = acm_set_control(acm, val);
 615         if (res && (acm->ctrl_caps & USB_CDC_CAP_LINE))
 616                 dev_err(&acm->control->dev, "failed to set dtr/rts\n");
 617 }
 618
 619 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
 620 {
 621         struct acm *acm = container_of(port, struct acm, port);
 622         int retval = -ENODEV;
 623         int i;
 624
 625         mutex_lock(&acm->mutex);
 626         if (acm->disconnected)
 627                 goto disconnected;
 628
 629         retval = usb_autopm_get_interface(acm->control);
 630         if (retval)
 631                 goto error_get_interface;
 632
 633         /*
 634          * FIXME: Why do we need this? Allocating 64K of physically contiguous
 635          * memory is really nasty...
 636          */
 637         set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
 638         acm->control->needs_remote_wakeup = 1;
 639
 640         acm->ctrlurb->dev = acm->dev;
 641         retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
 642         if (retval) {
 643                 dev_err(&acm->control->dev,
 644                         "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
 645                 goto error_submit_urb;
 646         }
 647
 648         acm_tty_set_termios(tty, NULL);
 649
 650         /*
 651          * Unthrottle device in case the TTY was closed while throttled.
 652          */
 653         spin_lock_irq(&acm->read_lock);
 654         acm->throttled = 0;
 655         acm->throttle_req = 0;
 656         spin_unlock_irq(&acm->read_lock);
 657
 658         retval = acm_submit_read_urbs(acm, GFP_KERNEL);
 659         if (retval)
 660                 goto error_submit_read_urbs;
 661
 662         usb_autopm_put_interface(acm->control);
 663
 664         mutex_unlock(&acm->mutex);
 665
 666         return 0;
 667
 668 error_submit_read_urbs:
 669         for (i = 0; i < acm->rx_buflimit; i++)
 670                 usb_kill_urb(acm->read_urbs[i]);
 671         usb_kill_urb(acm->ctrlurb);
 672 error_submit_urb:
 673         usb_autopm_put_interface(acm->control);
 674 error_get_interface:
 675 disconnected:
 676         mutex_unlock(&acm->mutex);
 677
 678         return usb_translate_errors(retval);
 679 }
 680
 681 static void acm_port_destruct(struct tty_port *port)
 682 {
 683         struct acm *acm = container_of(port, struct acm, port);
 684
 685         acm_release_minor(acm);
 686         usb_put_intf(acm->control);
 687         kfree(acm->country_codes);
 688         kfree(acm);
 689 }
 690
 691 static void acm_port_shutdown(struct tty_port *port)
 692 {
 693         struct acm *acm = container_of(port, struct acm, port);
 694         struct urb *urb;
 695         struct acm_wb *wb;
 696
 697         /*
 698          * Need to grab write_lock to prevent race with resume, but no need to
 699          * hold it due to the tty-port initialised flag.
 700          */
 701         spin_lock_irq(&acm->write_lock);
 702         spin_unlock_irq(&acm->write_lock);
 703
 704         usb_autopm_get_interface_no_resume(acm->control);
 705         acm->control->needs_remote_wakeup = 0;
 706         usb_autopm_put_interface(acm->control);
 707
 708         for (;;) {
 709                 urb = usb_get_from_anchor(&acm->delayed);
 710                 if (!urb)
 711                         break;
 712                 wb = urb->context;
 713                 wb->use = 0;
 714                 usb_autopm_put_interface_async(acm->control);
 715         }
 716
 717         acm_kill_urbs(acm);
 718 }
 719
 720 static void acm_tty_cleanup(struct tty_struct *tty)
 721 {
 722         struct acm *acm = tty->driver_data;
 723
 724         tty_port_put(&acm->port);
 725 }
 726
 727 static void acm_tty_hangup(struct tty_struct *tty)
 728 {
 729         struct acm *acm = tty->driver_data;
 730
 731         tty_port_hangup(&acm->port);
 732 }
 733
 734 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
 735 {
 736         struct acm *acm = tty->driver_data;
 737
 738         tty_port_close(&acm->port, tty, filp);
 739 }
 740
 741 static int acm_tty_write(struct tty_struct *tty,
 742                                         const unsigned char *buf, int count)
 743 {
 744         struct acm *acm = tty->driver_data;
 745         int stat;
 746         unsigned long flags;
 747         int wbn;
 748         struct acm_wb *wb;
 749
 750         if (!count)
 751                 return 0;
 752
 753         dev_vdbg(&acm->data->dev, "%d bytes from tty layer\n", count);
 754
 755         spin_lock_irqsave(&acm->write_lock, flags);
 756         wbn = acm_wb_alloc(acm);
 757         if (wbn < 0) {
 758                 spin_unlock_irqrestore(&acm->write_lock, flags);
 759                 return 0;
 760         }
 761         wb = &acm->wb[wbn];
 762
 763         if (!acm->dev) {
 764                 wb->use = 0;
 765                 spin_unlock_irqrestore(&acm->write_lock, flags);
 766                 return -ENODEV;
 767         }
 768
 769         count = (count > acm->writesize) ? acm->writesize : count;
 770         dev_vdbg(&acm->data->dev, "writing %d bytes\n", count);
 771         memcpy(wb->buf, buf, count);
 772         wb->len = count;
 773
 774         stat = usb_autopm_get_interface_async(acm->control);
 775         if (stat) {
 776                 wb->use = 0;
 777                 spin_unlock_irqrestore(&acm->write_lock, flags);
 778                 return stat;
 779         }
 780
 781         if (acm->susp_count) {
 782                 usb_anchor_urb(wb->urb, &acm->delayed);
 783                 spin_unlock_irqrestore(&acm->write_lock, flags);
 784                 return count;
 785         }
 786
 787         stat = acm_start_wb(acm, wb);
 788         spin_unlock_irqrestore(&acm->write_lock, flags);
 789
 790         if (stat < 0)
 791                 return stat;
 792         return count;
 793 }
 794
 795 static int acm_tty_write_room(struct tty_struct *tty)
 796 {
 797         struct acm *acm = tty->driver_data;
 798         /*
 799          * Do not let the line discipline to know that we have a reserve,
 800          * or it might get too enthusiastic.
 801          */
 802         return acm_wb_is_avail(acm) ? acm->writesize : 0;
 803 }
 804
 805 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
 806 {
 807         struct acm *acm = tty->driver_data;
 808         /*
 809          * if the device was unplugged then any remaining characters fell out
 810          * of the connector ;)
 811          */
 812         if (acm->disconnected)
 813                 return 0;
 814         /*
 815          * This is inaccurate (overcounts), but it works.
 816          */
 817         return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
 818 }
 819
 820 static void acm_tty_throttle(struct tty_struct *tty)
 821 {
 822         struct acm *acm = tty->driver_data;
 823
 824         spin_lock_irq(&acm->read_lock);
 825         acm->throttle_req = 1;
 826         spin_unlock_irq(&acm->read_lock);
 827 }
 828
 829 static void acm_tty_unthrottle(struct tty_struct *tty)
 830 {
 831         struct acm *acm = tty->driver_data;
 832         unsigned int was_throttled;
 833
 834         spin_lock_irq(&acm->read_lock);
 835         was_throttled = acm->throttled;
 836         acm->throttled = 0;
 837         acm->throttle_req = 0;
 838         spin_unlock_irq(&acm->read_lock);
 839
 840         if (was_throttled)
 841                 acm_submit_read_urbs(acm, GFP_KERNEL);
 842 }
 843
 844 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
 845 {
 846         struct acm *acm = tty->driver_data;
 847         int retval;
 848
 849         retval = acm_send_break(acm, state ? 0xffff : 0);
 850         if (retval < 0)
 851                 dev_dbg(&acm->control->dev,
 852                         "%s - send break failed\n", __func__);
 853         return retval;
 854 }
 855
 856 static int acm_tty_tiocmget(struct tty_struct *tty)
 857 {
 858         struct acm *acm = tty->driver_data;
 859
 860         return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
 861                (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
 862                (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
 863                (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
 864                (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
 865                TIOCM_CTS;
 866 }
 867
 868 static int acm_tty_tiocmset(struct tty_struct *tty,
 869                             unsigned int set, unsigned int clear)
 870 {
 871         struct acm *acm = tty->driver_data;
 872         unsigned int newctrl;
 873
 874         newctrl = acm->ctrlout;
 875         set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 876                                         (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 877         clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 878                                         (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 879
 880         newctrl = (newctrl & ~clear) | set;
 881
 882         if (acm->ctrlout == newctrl)
 883                 return 0;
 884         return acm_set_control(acm, acm->ctrlout = newctrl);
 885 }
 886
 887 static int get_serial_info(struct tty_struct *tty, struct serial_struct *ss)
 888 {
 889         struct acm *acm = tty->driver_data;
 890
 891         ss->xmit_fifo_size = acm->writesize;
 892         ss->baud_base = le32_to_cpu(acm->line.dwDTERate);
 893         ss->close_delay = acm->port.close_delay / 10;
 894         ss->closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 895                                 ASYNC_CLOSING_WAIT_NONE :
 896                                 acm->port.closing_wait / 10;
 897         return 0;
 898 }
 899
 900 static int set_serial_info(struct tty_struct *tty, struct serial_struct *ss)
 901 {
 902         struct acm *acm = tty->driver_data;
 903         unsigned int closing_wait, close_delay;
 904         int retval = 0;
 905
 906         close_delay = ss->close_delay * 10;
 907         closing_wait = ss->closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 908                         ASYNC_CLOSING_WAIT_NONE : ss->closing_wait * 10;
 909
 910         mutex_lock(&acm->port.mutex);
 911
 912         if (!capable(CAP_SYS_ADMIN)) {
 913                 if ((close_delay != acm->port.close_delay) ||
 914                     (closing_wait != acm->port.closing_wait))
 915                         retval = -EPERM;
 916                 else
 917                         retval = -EOPNOTSUPP;
 918         } else {
 919                 acm->port.close_delay  = close_delay;
 920                 acm->port.closing_wait = closing_wait;
 921         }
 922
 923         mutex_unlock(&acm->port.mutex);
 924         return retval;
 925 }
 926
 927 static int wait_serial_change(struct acm *acm, unsigned long arg)
 928 {
 929         int rv = 0;
 930         DECLARE_WAITQUEUE(wait, current);
 931         struct async_icount old, new;
 932
 933         do {
 934                 spin_lock_irq(&acm->read_lock);
 935                 old = acm->oldcount;
 936                 new = acm->iocount;
 937                 acm->oldcount = new;
 938                 spin_unlock_irq(&acm->read_lock);
 939
 940                 if ((arg & TIOCM_DSR) &&
 941                         old.dsr != new.dsr)
 942                         break;
 943                 if ((arg & TIOCM_CD)  &&
 944                         old.dcd != new.dcd)
 945                         break;
 946                 if ((arg & TIOCM_RI) &&
 947                         old.rng != new.rng)
 948                         break;
 949
 950                 add_wait_queue(&acm->wioctl, &wait);
 951                 set_current_state(TASK_INTERRUPTIBLE);
 952                 schedule();
 953                 remove_wait_queue(&acm->wioctl, &wait);
 954                 if (acm->disconnected) {
 955                         if (arg & TIOCM_CD)
 956                                 break;
 957                         else
 958                                 rv = -ENODEV;
 959                 } else {
 960                         if (signal_pending(current))
 961                                 rv = -ERESTARTSYS;
 962                 }
 963         } while (!rv);
 964
 965
 966
 967         return rv;
 968 }
 969
 970 static int acm_tty_get_icount(struct tty_struct *tty,
 971                                         struct serial_icounter_struct *icount)
 972 {
 973         struct acm *acm = tty->driver_data;
 974
 975         icount->dsr = acm->iocount.dsr;
 976         icount->rng = acm->iocount.rng;
 977         icount->dcd = acm->iocount.dcd;
 978         icount->frame = acm->iocount.frame;
 979         icount->overrun = acm->iocount.overrun;
 980         icount->parity = acm->iocount.parity;
 981         icount->brk = acm->iocount.brk;
 982
 983         return 0;
 984 }
 985
 986 static int acm_tty_ioctl(struct tty_struct *tty,
 987                                         unsigned int cmd, unsigned long arg)
 988 {
 989         struct acm *acm = tty->driver_data;
 990         int rv = -ENOIOCTLCMD;
 991
 992         switch (cmd) {
 993         case TIOCMIWAIT:
 994                 rv = usb_autopm_get_interface(acm->control);
 995                 if (rv < 0) {
 996                         rv = -EIO;
 997                         break;
 998                 }
 999                 rv = wait_serial_change(acm, arg);
1000                 usb_autopm_put_interface(acm->control);
1001                 break;
1002         }
1003
1004         return rv;
1005 }
1006
1007 static void acm_tty_set_termios(struct tty_struct *tty,
1008                                                 struct ktermios *termios_old)
1009 {
1010         struct acm *acm = tty->driver_data;
1011         struct ktermios *termios = &tty->termios;
1012         struct usb_cdc_line_coding newline;
1013         int newctrl = acm->ctrlout;
1014
1015         newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
1016         newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
1017         newline.bParityType = termios->c_cflag & PARENB ?
1018                                 (termios->c_cflag & PARODD ? 1 : 2) +
1019                                 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
1020         switch (termios->c_cflag & CSIZE) {
1021         case CS5:
1022                 newline.bDataBits = 5;
1023                 break;
1024         case CS6:
1025                 newline.bDataBits = 6;
1026                 break;
1027         case CS7:
1028                 newline.bDataBits = 7;
1029                 break;
1030         case CS8:
1031         default:
1032                 newline.bDataBits = 8;
1033                 break;
1034         }
1035         /* FIXME: Needs to clear unsupported bits in the termios */
1036         acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
1037
1038         if (C_BAUD(tty) == B0) {
1039                 newline.dwDTERate = acm->line.dwDTERate;
1040                 newctrl &= ~ACM_CTRL_DTR;
1041         } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
1042                 newctrl |=  ACM_CTRL_DTR;
1043         }
1044
1045         if (newctrl != acm->ctrlout)
1046                 acm_set_control(acm, acm->ctrlout = newctrl);
1047
1048         if (memcmp(&acm->line, &newline, sizeof newline)) {
1049                 memcpy(&acm->line, &newline, sizeof newline);
1050                 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
1051                         __func__,
1052                         le32_to_cpu(newline.dwDTERate),
1053                         newline.bCharFormat, newline.bParityType,
1054                         newline.bDataBits);
1055                 acm_set_line(acm, &acm->line);
1056         }
1057 }
1058
1059 static const struct tty_port_operations acm_port_ops = {
1060         .dtr_rts = acm_port_dtr_rts,
1061         .shutdown = acm_port_shutdown,
1062         .activate = acm_port_activate,
1063         .destruct = acm_port_destruct,
1064 };
1065
1066 /*
1067  * USB probe and disconnect routines.
1068  */
1069
1070 /* Little helpers: write/read buffers free */
1071 static void acm_write_buffers_free(struct acm *acm)
1072 {
1073         int i;
1074         struct acm_wb *wb;
1075
1076         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1077                 usb_free_coherent(acm->dev, acm->writesize, wb->buf, wb->dmah);
1078 }
1079
1080 static void acm_read_buffers_free(struct acm *acm)
1081 {
1082         int i;
1083
1084         for (i = 0; i < acm->rx_buflimit; i++)
1085                 usb_free_coherent(acm->dev, acm->readsize,
1086                           acm->read_buffers[i].base, acm->read_buffers[i].dma);
1087 }
1088
1089 /* Little helper: write buffers allocate */
1090 static int acm_write_buffers_alloc(struct acm *acm)
1091 {
1092         int i;
1093         struct acm_wb *wb;
1094
1095         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1096                 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1097                     &wb->dmah);
1098                 if (!wb->buf) {
1099                         while (i != 0) {
1100                                 --i;
1101                                 --wb;
1102                                 usb_free_coherent(acm->dev, acm->writesize,
1103                                     wb->buf, wb->dmah);
1104                         }
1105                         return -ENOMEM;
1106                 }
1107         }
1108         return 0;
1109 }
1110
1111 static int acm_probe(struct usb_interface *intf,
1112                      const struct usb_device_id *id)
1113 {
1114         struct usb_cdc_union_desc *union_header = NULL;
1115         struct usb_cdc_call_mgmt_descriptor *cmgmd = NULL;
1116         unsigned char *buffer = intf->altsetting->extra;
1117         int buflen = intf->altsetting->extralen;
1118         struct usb_interface *control_interface;
1119         struct usb_interface *data_interface;
1120         struct usb_endpoint_descriptor *epctrl = NULL;
1121         struct usb_endpoint_descriptor *epread = NULL;
1122         struct usb_endpoint_descriptor *epwrite = NULL;
1123         struct usb_device *usb_dev = interface_to_usbdev(intf);
1124         struct usb_cdc_parsed_header h;
1125         struct acm *acm;
1126         int minor;
1127         int ctrlsize, readsize;
1128         u8 *buf;
1129         int call_intf_num = -1;
1130         int data_intf_num = -1;
1131         unsigned long quirks;
1132         int num_rx_buf;
1133         int i;
1134         int combined_interfaces = 0;
1135         struct device *tty_dev;
1136         int rv = -ENOMEM;
1137         int res;
1138
1139         /* normal quirks */
1140         quirks = (unsigned long)id->driver_info;
1141
1142         if (quirks == IGNORE_DEVICE)
1143                 return -ENODEV;
1144
1145         memset(&h, 0x00, sizeof(struct usb_cdc_parsed_header));
1146
1147         num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1148
1149         /* handle quirks deadly to normal probing*/
1150         if (quirks == NO_UNION_NORMAL) {
1151                 data_interface = usb_ifnum_to_if(usb_dev, 1);
1152                 control_interface = usb_ifnum_to_if(usb_dev, 0);
1153                 /* we would crash */
1154                 if (!data_interface || !control_interface)
1155                         return -ENODEV;
1156                 goto skip_normal_probe;
1157         }
1158
1159         /* normal probing*/
1160         if (!buffer) {
1161                 dev_err(&intf->dev, "Weird descriptor references\n");
1162                 return -EINVAL;
1163         }
1164
1165         if (!intf->cur_altsetting)
1166                 return -EINVAL;
1167
1168         if (!buflen) {
1169                 if (intf->cur_altsetting->endpoint &&
1170                                 intf->cur_altsetting->endpoint->extralen &&
1171                                 intf->cur_altsetting->endpoint->extra) {
1172                         dev_dbg(&intf->dev,
1173                                 "Seeking extra descriptors on endpoint\n");
1174                         buflen = intf->cur_altsetting->endpoint->extralen;
1175                         buffer = intf->cur_altsetting->endpoint->extra;
1176                 } else {
1177                         dev_err(&intf->dev,
1178                                 "Zero length descriptor references\n");
1179                         return -EINVAL;
1180                 }
1181         }
1182
1183         cdc_parse_cdc_header(&h, intf, buffer, buflen);
1184         union_header = h.usb_cdc_union_desc;
1185         cmgmd = h.usb_cdc_call_mgmt_descriptor;
1186         if (cmgmd)
1187                 call_intf_num = cmgmd->bDataInterface;
1188
1189         if (!union_header) {
1190                 if (call_intf_num > 0) {
1191                         dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1192                         /* quirks for Droids MuIn LCD */
1193                         if (quirks & NO_DATA_INTERFACE) {
1194                                 data_interface = usb_ifnum_to_if(usb_dev, 0);
1195                         } else {
1196                                 data_intf_num = call_intf_num;
1197                                 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1198                         }
1199                         control_interface = intf;
1200                 } else {
1201                         if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1202                                 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1203                                 return -ENODEV;
1204                         } else {
1205                                 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1206                                 combined_interfaces = 1;
1207                                 control_interface = data_interface = intf;
1208                                 goto look_for_collapsed_interface;
1209                         }
1210                 }
1211         } else {
1212                 data_intf_num = union_header->bSlaveInterface0;
1213                 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1214                 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1215         }
1216
1217         if (!control_interface || !data_interface) {
1218                 dev_dbg(&intf->dev, "no interfaces\n");
1219                 return -ENODEV;
1220         }
1221         if (!data_interface->cur_altsetting || !control_interface->cur_altsetting)
1222                 return -ENODEV;
1223
1224         if (data_intf_num != call_intf_num)
1225                 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1226
1227         if (control_interface == data_interface) {
1228                 /* some broken devices designed for windows work this way */
1229                 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1230                 combined_interfaces = 1;
1231                 /* a popular other OS doesn't use it */
1232                 quirks |= NO_CAP_LINE;
1233                 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1234                         dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1235                         return -EINVAL;
1236                 }
1237 look_for_collapsed_interface:
1238                 res = usb_find_common_endpoints(data_interface->cur_altsetting,
1239                                 &epread, &epwrite, &epctrl, NULL);
1240                 if (res)
1241                         return res;
1242
1243                 goto made_compressed_probe;
1244         }
1245
1246 skip_normal_probe:
1247
1248         /*workaround for switched interfaces */
1249         if (data_interface->cur_altsetting->desc.bInterfaceClass
1250                                                 != CDC_DATA_INTERFACE_TYPE) {
1251                 if (control_interface->cur_altsetting->desc.bInterfaceClass
1252                                                 == CDC_DATA_INTERFACE_TYPE) {
1253                         dev_dbg(&intf->dev,
1254                                 "Your device has switched interfaces.\n");
1255                         swap(control_interface, data_interface);
1256                 } else {
1257                         return -EINVAL;
1258                 }
1259         }
1260
1261         /* Accept probe requests only for the control interface */
1262         if (!combined_interfaces && intf != control_interface)
1263                 return -ENODEV;
1264
1265         if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1266                 /* valid in this context */
1267                 dev_dbg(&intf->dev, "The data interface isn't available\n");
1268                 return -EBUSY;
1269         }
1270
1271
1272         if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1273             control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1274                 return -EINVAL;
1275
1276         epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1277         epread = &data_interface->cur_altsetting->endpoint[0].desc;
1278         epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1279
1280
1281         /* workaround for switched endpoints */
1282         if (!usb_endpoint_dir_in(epread)) {
1283                 /* descriptors are swapped */
1284                 dev_dbg(&intf->dev,
1285                         "The data interface has switched endpoints\n");
1286                 swap(epread, epwrite);
1287         }
1288 made_compressed_probe:
1289         dev_dbg(&intf->dev, "interfaces are valid\n");
1290
1291         acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1292         if (acm == NULL)
1293                 goto alloc_fail;
1294
1295         tty_port_init(&acm->port);
1296         acm->port.ops = &acm_port_ops;
1297
1298         minor = acm_alloc_minor(acm);
1299         if (minor < 0)
1300                 goto alloc_fail1;
1301
1302         ctrlsize = usb_endpoint_maxp(epctrl);
1303         readsize = usb_endpoint_maxp(epread) *
1304                                 (quirks == SINGLE_RX_URB ? 1 : 2);
1305         acm->combined_interfaces = combined_interfaces;
1306         acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1307         acm->control = control_interface;
1308         acm->data = data_interface;
1309         acm->minor = minor;
1310         acm->dev = usb_dev;
1311         if (h.usb_cdc_acm_descriptor)
1312                 acm->ctrl_caps = h.usb_cdc_acm_descriptor->bmCapabilities;
1313         if (quirks & NO_CAP_LINE)
1314                 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1315         acm->ctrlsize = ctrlsize;
1316         acm->readsize = readsize;
1317         acm->rx_buflimit = num_rx_buf;
1318         INIT_WORK(&acm->work, acm_softint);
1319         init_waitqueue_head(&acm->wioctl);
1320         spin_lock_init(&acm->write_lock);
1321         spin_lock_init(&acm->read_lock);
1322         mutex_init(&acm->mutex);
1323         if (usb_endpoint_xfer_int(epread)) {
1324                 acm->bInterval = epread->bInterval;
1325                 acm->in = usb_rcvintpipe(usb_dev, epread->bEndpointAddress);
1326         } else {
1327                 acm->in = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1328         }
1329         if (usb_endpoint_xfer_int(epwrite))
1330                 acm->out = usb_sndintpipe(usb_dev, epwrite->bEndpointAddress);
1331         else
1332                 acm->out = usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress);
1333         init_usb_anchor(&acm->delayed);
1334         acm->quirks = quirks;
1335
1336         buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1337         if (!buf)
1338                 goto alloc_fail1;
1339         acm->ctrl_buffer = buf;
1340
1341         if (acm_write_buffers_alloc(acm) < 0)
1342                 goto alloc_fail2;
1343
1344         acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1345         if (!acm->ctrlurb)
1346                 goto alloc_fail3;
1347
1348         for (i = 0; i < num_rx_buf; i++) {
1349                 struct acm_rb *rb = &(acm->read_buffers[i]);
1350                 struct urb *urb;
1351
1352                 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1353                                                                 &rb->dma);
1354                 if (!rb->base)
1355                         goto alloc_fail4;
1356                 rb->index = i;
1357                 rb->instance = acm;
1358
1359                 urb = usb_alloc_urb(0, GFP_KERNEL);
1360                 if (!urb)
1361                         goto alloc_fail4;
1362
1363                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1364                 urb->transfer_dma = rb->dma;
1365                 if (usb_endpoint_xfer_int(epread))
1366                         usb_fill_int_urb(urb, acm->dev, acm->in, rb->base,
1367                                          acm->readsize,
1368                                          acm_read_bulk_callback, rb,
1369                                          acm->bInterval);
1370                 else
1371                         usb_fill_bulk_urb(urb, acm->dev, acm->in, rb->base,
1372                                           acm->readsize,
1373                                           acm_read_bulk_callback, rb);
1374
1375                 acm->read_urbs[i] = urb;
1376                 __set_bit(i, &acm->read_urbs_free);
1377         }
1378         for (i = 0; i < ACM_NW; i++) {
1379                 struct acm_wb *snd = &(acm->wb[i]);
1380
1381                 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1382                 if (snd->urb == NULL)
1383                         goto alloc_fail5;
1384
1385                 if (usb_endpoint_xfer_int(epwrite))
1386                         usb_fill_int_urb(snd->urb, usb_dev, acm->out,
1387                                 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1388                 else
1389                         usb_fill_bulk_urb(snd->urb, usb_dev, acm->out,
1390                                 NULL, acm->writesize, acm_write_bulk, snd);
1391                 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1392                 if (quirks & SEND_ZERO_PACKET)
1393                         snd->urb->transfer_flags |= URB_ZERO_PACKET;
1394                 snd->instance = acm;
1395         }
1396
1397         usb_set_intfdata(intf, acm);
1398
1399         i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1400         if (i < 0)
1401                 goto alloc_fail5;
1402
1403         if (h.usb_cdc_country_functional_desc) { /* export the country data */
1404                 struct usb_cdc_country_functional_desc * cfd =
1405                                         h.usb_cdc_country_functional_desc;
1406
1407                 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1408                 if (!acm->country_codes)
1409                         goto skip_countries;
1410                 acm->country_code_size = cfd->bLength - 4;
1411                 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1412                                                         cfd->bLength - 4);
1413                 acm->country_rel_date = cfd->iCountryCodeRelDate;
1414
1415                 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1416                 if (i < 0) {
1417                         kfree(acm->country_codes);
1418                         acm->country_codes = NULL;
1419                         acm->country_code_size = 0;
1420                         goto skip_countries;
1421                 }
1422
1423                 i = device_create_file(&intf->dev,
1424                                                 &dev_attr_iCountryCodeRelDate);
1425                 if (i < 0) {
1426                         device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1427                         kfree(acm->country_codes);
1428                         acm->country_codes = NULL;
1429                         acm->country_code_size = 0;
1430                         goto skip_countries;
1431                 }
1432         }
1433
1434 skip_countries:
1435         usb_fill_int_urb(acm->ctrlurb, usb_dev,
1436                          usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1437                          acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1438                          /* works around buggy devices */
1439                          epctrl->bInterval ? epctrl->bInterval : 16);
1440         acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1441         acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1442         acm->notification_buffer = NULL;
1443         acm->nb_index = 0;
1444         acm->nb_size = 0;
1445
1446         dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1447
1448         acm->line.dwDTERate = cpu_to_le32(9600);
1449         acm->line.bDataBits = 8;
1450         acm_set_line(acm, &acm->line);
1451
1452         usb_driver_claim_interface(&acm_driver, data_interface, acm);
1453         usb_set_intfdata(data_interface, acm);
1454
1455         usb_get_intf(control_interface);
1456         tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1457                         &control_interface->dev);
1458         if (IS_ERR(tty_dev)) {
1459                 rv = PTR_ERR(tty_dev);
1460                 goto alloc_fail6;
1461         }
1462
1463         if (quirks & CLEAR_HALT_CONDITIONS) {
1464                 usb_clear_halt(usb_dev, acm->in);
1465                 usb_clear_halt(usb_dev, acm->out);
1466         }
1467
1468         return 0;
1469 alloc_fail6:
1470         if (acm->country_codes) {
1471                 device_remove_file(&acm->control->dev,
1472                                 &dev_attr_wCountryCodes);
1473                 device_remove_file(&acm->control->dev,
1474                                 &dev_attr_iCountryCodeRelDate);
1475                 kfree(acm->country_codes);
1476         }
1477         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1478 alloc_fail5:
1479         usb_set_intfdata(intf, NULL);
1480         for (i = 0; i < ACM_NW; i++)
1481                 usb_free_urb(acm->wb[i].urb);
1482 alloc_fail4:
1483         for (i = 0; i < num_rx_buf; i++)
1484                 usb_free_urb(acm->read_urbs[i]);
1485         acm_read_buffers_free(acm);
1486         usb_free_urb(acm->ctrlurb);
1487 alloc_fail3:
1488         acm_write_buffers_free(acm);
1489 alloc_fail2:
1490         usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1491 alloc_fail1:
1492         tty_port_put(&acm->port);
1493 alloc_fail:
1494         return rv;
1495 }
1496
1497 static void acm_disconnect(struct usb_interface *intf)
1498 {
1499         struct acm *acm = usb_get_intfdata(intf);
1500         struct tty_struct *tty;
1501         int i;
1502
1503         /* sibling interface is already cleaning up */
1504         if (!acm)
1505                 return;
1506
1507         mutex_lock(&acm->mutex);
1508         acm->disconnected = true;
1509         if (acm->country_codes) {
1510                 device_remove_file(&acm->control->dev,
1511                                 &dev_attr_wCountryCodes);
1512                 device_remove_file(&acm->control->dev,
1513                                 &dev_attr_iCountryCodeRelDate);
1514         }
1515         wake_up_all(&acm->wioctl);
1516         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1517         usb_set_intfdata(acm->control, NULL);
1518         usb_set_intfdata(acm->data, NULL);
1519         mutex_unlock(&acm->mutex);
1520
1521         tty = tty_port_tty_get(&acm->port);
1522         if (tty) {
1523                 tty_vhangup(tty);
1524                 tty_kref_put(tty);
1525         }
1526
1527         acm_kill_urbs(acm);
1528         cancel_work_sync(&acm->work);
1529
1530         tty_unregister_device(acm_tty_driver, acm->minor);
1531
1532         usb_free_urb(acm->ctrlurb);
1533         for (i = 0; i < ACM_NW; i++)
1534                 usb_free_urb(acm->wb[i].urb);
1535         for (i = 0; i < acm->rx_buflimit; i++)
1536                 usb_free_urb(acm->read_urbs[i]);
1537         acm_write_buffers_free(acm);
1538         usb_free_coherent(acm->dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1539         acm_read_buffers_free(acm);
1540
1541         kfree(acm->notification_buffer);
1542
1543         if (!acm->combined_interfaces)
1544                 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1545                                         acm->data : acm->control);
1546
1547         tty_port_put(&acm->port);
1548 }
1549
1550 #ifdef CONFIG_PM
1551 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1552 {
1553         struct acm *acm = usb_get_intfdata(intf);
1554         int cnt;
1555
1556         spin_lock_irq(&acm->write_lock);
1557         if (PMSG_IS_AUTO(message)) {
1558                 if (acm->transmitting) {
1559                         spin_unlock_irq(&acm->write_lock);
1560                         return -EBUSY;
1561                 }
1562         }
1563         cnt = acm->susp_count++;
1564         spin_unlock_irq(&acm->write_lock);
1565
1566         if (cnt)
1567                 return 0;
1568
1569         acm_kill_urbs(acm);
1570         cancel_work_sync(&acm->work);
1571
1572         return 0;
1573 }
1574
1575 static int acm_resume(struct usb_interface *intf)
1576 {
1577         struct acm *acm = usb_get_intfdata(intf);
1578         struct urb *urb;
1579         int rv = 0;
1580
1581         spin_lock_irq(&acm->write_lock);
1582
1583         if (--acm->susp_count)
1584                 goto out;
1585
1586         if (tty_port_initialized(&acm->port)) {
1587                 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1588
1589                 for (;;) {
1590                         urb = usb_get_from_anchor(&acm->delayed);
1591                         if (!urb)
1592                                 break;
1593
1594                         acm_start_wb(acm, urb->context);
1595                 }
1596
1597                 /*
1598                  * delayed error checking because we must
1599                  * do the write path at all cost
1600                  */
1601                 if (rv < 0)
1602                         goto out;
1603
1604                 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1605         }
1606 out:
1607         spin_unlock_irq(&acm->write_lock);
1608
1609         return rv;
1610 }
1611
1612 static int acm_reset_resume(struct usb_interface *intf)
1613 {
1614         struct acm *acm = usb_get_intfdata(intf);
1615
1616         if (tty_port_initialized(&acm->port))
1617                 tty_port_tty_hangup(&acm->port, false);
1618
1619         return acm_resume(intf);
1620 }
1621
1622 #endif /* CONFIG_PM */
1623
1624 static int acm_pre_reset(struct usb_interface *intf)
1625 {
1626         struct acm *acm = usb_get_intfdata(intf);
1627
1628         clear_bit(EVENT_RX_STALL, &acm->flags);
1629         acm->nb_index = 0; /* pending control transfers are lost */
1630
1631         return 0;
1632 }
1633
1634 #define NOKIA_PCSUITE_ACM_INFO(x) \
1635                 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1636                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1637                 USB_CDC_ACM_PROTO_VENDOR)
1638
1639 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1640                 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1641                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1642                 USB_CDC_ACM_PROTO_VENDOR)
1643
1644 /*
1645  * USB driver structure.
1646  */
1647
1648 static const struct usb_device_id acm_ids[] = {
1649         /* quirky and broken devices */
1650         { USB_DEVICE(0x076d, 0x0006), /* Denso Cradle CU-321 */
1651         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1652         { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1653         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1654         { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1655         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1656         },
1657         { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1658         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1659         },
1660         { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1661         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1662         },
1663         { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1664         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1665         },
1666         { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1667         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1668         },
1669         { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1670         .driver_info = SINGLE_RX_URB,
1671         },
1672         { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1673         .driver_info = SINGLE_RX_URB, /* firmware bug */
1674         },
1675         { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1676         .driver_info = SINGLE_RX_URB, /* firmware bug */
1677         },
1678         { USB_DEVICE(0x11ca, 0x0201), /* VeriFone Mx870 Gadget Serial */
1679         .driver_info = SINGLE_RX_URB,
1680         },
1681         { USB_DEVICE(0x1965, 0x0018), /* Uniden UBC125XLT */
1682         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1683         },
1684         { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1685         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1686         },
1687         { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1688         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1689         },
1690         { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1691         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1692         },
1693         { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1694         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1695         },
1696         { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1697         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1698         },
1699         { USB_DEVICE(0x20df, 0x0001), /* Simtec Electronics Entropy Key */
1700         .driver_info = QUIRK_CONTROL_LINE_STATE, },
1701         { USB_DEVICE(0x2184, 0x001c) }, /* GW Instek AFG-2225 */
1702         { USB_DEVICE(0x2184, 0x0036) }, /* GW Instek AFG-125 */
1703         { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1704         },
1705         /* Motorola H24 HSPA module: */
1706         { USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1707         { USB_DEVICE(0x22b8, 0x2d92),   /* modem           + diagnostics        */
1708         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1709         },
1710         { USB_DEVICE(0x22b8, 0x2d93),   /* modem + AT port                      */
1711         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1712         },
1713         { USB_DEVICE(0x22b8, 0x2d95),   /* modem + AT port + diagnostics        */
1714         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1715         },
1716         { USB_DEVICE(0x22b8, 0x2d96),   /* modem                         + NMEA */
1717         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1718         },
1719         { USB_DEVICE(0x22b8, 0x2d97),   /* modem           + diagnostics + NMEA */
1720         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1721         },
1722         { USB_DEVICE(0x22b8, 0x2d99),   /* modem + AT port               + NMEA */
1723         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1724         },
1725         { USB_DEVICE(0x22b8, 0x2d9a),   /* modem + AT port + diagnostics + NMEA */
1726         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1727         },
1728
1729         { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1730         .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1731                                            data interface instead of
1732                                            communications interface.
1733                                            Maybe we should define a new
1734                                            quirk for this. */
1735         },
1736         { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1737         .driver_info = NO_UNION_NORMAL,
1738         },
1739         { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1740         .driver_info = NO_UNION_NORMAL,
1741         },
1742         { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1743         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1744         },
1745         { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1746         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1747         },
1748         { USB_DEVICE(0xfff0, 0x0100), /* DATECS FP-2000 */
1749         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1750         },
1751         { USB_DEVICE(0x09d8, 0x0320), /* Elatec GmbH TWN3 */
1752         .driver_info = NO_UNION_NORMAL, /* has misplaced union descriptor */
1753         },
1754         { USB_DEVICE(0x0ca6, 0xa050), /* Castles VEGA3000 */
1755         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1756         },
1757
1758         { USB_DEVICE(0x2912, 0x0001), /* ATOL FPrint */
1759         .driver_info = CLEAR_HALT_CONDITIONS,
1760         },
1761
1762         /* Nokia S60 phones expose two ACM channels. The first is
1763          * a modem and is picked up by the standard AT-command
1764          * information below. The second is 'vendor-specific' but
1765          * is treated as a serial device at the S60 end, so we want
1766          * to expose it on Linux too. */
1767         { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1768         { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1769         { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1770         { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1771         { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1772         { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1773         { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1774         { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1775         { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1776         { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1777         { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1778         { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1779         { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1780         { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1781         { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1782         { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1783         { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1784         { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1785         { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1786         { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1787         { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1788         { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1789         { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1790         { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1791         { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1792         { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1793         { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1794         { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1795         { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1796         { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1797         { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1798         { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
1799         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1800         { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1801         { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1802         { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1803         { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1804         { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1805         { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1806         { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1807         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1808         { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1809         { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1810         { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1811         { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1812         { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1813         { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1814         { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1815         { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1816         { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1817         { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1818         { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1819         { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1820         { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1821         { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1822         { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1823         { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1824         { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1825
1826         /* Support for Owen devices */
1827         { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1828
1829         /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1830
1831         /* Support for Droids MuIn LCD */
1832         { USB_DEVICE(0x04d8, 0x000b),
1833         .driver_info = NO_DATA_INTERFACE,
1834         },
1835
1836 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1837         { USB_DEVICE(0x04d8, 0x0082),   /* Application mode */
1838         .driver_info = IGNORE_DEVICE,
1839         },
1840         { USB_DEVICE(0x04d8, 0x0083),   /* Bootloader mode */
1841         .driver_info = IGNORE_DEVICE,
1842         },
1843 #endif
1844
1845         /*Samsung phone in firmware update mode */
1846         { USB_DEVICE(0x04e8, 0x685d),
1847         .driver_info = IGNORE_DEVICE,
1848         },
1849
1850         /* Exclude Infineon Flash Loader utility */
1851         { USB_DEVICE(0x058b, 0x0041),
1852         .driver_info = IGNORE_DEVICE,
1853         },
1854
1855         /* control interfaces without any protocol set */
1856         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1857                 USB_CDC_PROTO_NONE) },
1858
1859         /* control interfaces with various AT-command sets */
1860         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1861                 USB_CDC_ACM_PROTO_AT_V25TER) },
1862         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1863                 USB_CDC_ACM_PROTO_AT_PCCA101) },
1864         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1865                 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1866         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1867                 USB_CDC_ACM_PROTO_AT_GSM) },
1868         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1869                 USB_CDC_ACM_PROTO_AT_3G) },
1870         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1871                 USB_CDC_ACM_PROTO_AT_CDMA) },
1872
1873         { USB_DEVICE(0x1519, 0x0452), /* Intel 7260 modem */
1874         .driver_info = SEND_ZERO_PACKET,
1875         },
1876
1877         { }
1878 };
1879
1880 MODULE_DEVICE_TABLE(usb, acm_ids);
1881
1882 static struct usb_driver acm_driver = {
1883         .name =         "cdc_acm",
1884         .probe =        acm_probe,
1885         .disconnect =   acm_disconnect,
1886 #ifdef CONFIG_PM
1887         .suspend =      acm_suspend,
1888         .resume =       acm_resume,
1889         .reset_resume = acm_reset_resume,
1890 #endif
1891         .pre_reset =    acm_pre_reset,
1892         .id_table =     acm_ids,
1893 #ifdef CONFIG_PM
1894         .supports_autosuspend = 1,
1895 #endif
1896         .disable_hub_initiated_lpm = 1,
1897 };
1898
1899 /*
1900  * TTY driver structures.
1901  */
1902
1903 static const struct tty_operations acm_ops = {
1904         .install =              acm_tty_install,
1905         .open =                 acm_tty_open,
1906         .close =                acm_tty_close,
1907         .cleanup =              acm_tty_cleanup,
1908         .hangup =               acm_tty_hangup,
1909         .write =                acm_tty_write,
1910         .write_room =           acm_tty_write_room,
1911         .ioctl =                acm_tty_ioctl,
1912         .throttle =             acm_tty_throttle,
1913         .unthrottle =           acm_tty_unthrottle,
1914         .chars_in_buffer =      acm_tty_chars_in_buffer,
1915         .break_ctl =            acm_tty_break_ctl,
1916         .set_termios =          acm_tty_set_termios,
1917         .tiocmget =             acm_tty_tiocmget,
1918         .tiocmset =             acm_tty_tiocmset,
1919         .get_serial =           get_serial_info,
1920         .set_serial =           set_serial_info,
1921         .get_icount =           acm_tty_get_icount,
1922 };
1923
1924 /*
1925  * Init / exit.
1926  */
1927
1928 static int __init acm_init(void)
1929 {
1930         int retval;
1931         acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1932         if (!acm_tty_driver)
1933                 return -ENOMEM;
1934         acm_tty_driver->driver_name = "acm",
1935         acm_tty_driver->name = "ttyACM",
1936         acm_tty_driver->major = ACM_TTY_MAJOR,
1937         acm_tty_driver->minor_start = 0,
1938         acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1939         acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1940         acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1941         acm_tty_driver->init_termios = tty_std_termios;
1942         acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1943                                                                 HUPCL | CLOCAL;
1944         tty_set_operations(acm_tty_driver, &acm_ops);
1945
1946         retval = tty_register_driver(acm_tty_driver);
1947         if (retval) {
1948                 put_tty_driver(acm_tty_driver);
1949                 return retval;
1950         }
1951
1952         retval = usb_register(&acm_driver);
1953         if (retval) {
1954                 tty_unregister_driver(acm_tty_driver);
1955                 put_tty_driver(acm_tty_driver);
1956                 return retval;
1957         }
1958
1959         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1960
1961         return 0;
1962 }
1963
1964 static void __exit acm_exit(void)
1965 {
1966         usb_deregister(&acm_driver);
1967         tty_unregister_driver(acm_tty_driver);
1968         put_tty_driver(acm_tty_driver);
1969         idr_destroy(&acm_minors);
1970 }
1971
1972 module_init(acm_init);
1973 module_exit(acm_exit);
1974
1975 MODULE_AUTHOR(DRIVER_AUTHOR);
1976 MODULE_DESCRIPTION(DRIVER_DESC);
1977 MODULE_LICENSE("GPL");
1978 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);