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                         u8 *new_buffer;
 382                         alloc_size = roundup_pow_of_two(expected_size);
 383                         /* Final freeing is done on disconnect. */
 384                         new_buffer = krealloc(acm->notification_buffer,
 385                                               alloc_size, GFP_ATOMIC);
 386                         if (!new_buffer) {
 387                                 acm->nb_index = 0;
 388                                 goto exit;
 389                         }
 390
 391                         acm->notification_buffer = new_buffer;
 392                         acm->nb_size = alloc_size;
 393                         dr = (struct usb_cdc_notification *)acm->notification_buffer;
 394                 }
 395
 396                 copy_size = min(current_size,
 397                                 expected_size - acm->nb_index);
 398
 399                 memcpy(&acm->notification_buffer[acm->nb_index],
 400                        urb->transfer_buffer, copy_size);
 401                 acm->nb_index += copy_size;
 402                 current_size = acm->nb_index;
 403         }
 404
 405         if (current_size >= expected_size) {
 406                 /* notification complete */
 407                 acm_process_notification(acm, (unsigned char *)dr);
 408                 acm->nb_index = 0;
 409         }
 410
 411 exit:
 412         retval = usb_submit_urb(urb, GFP_ATOMIC);
 413         if (retval && retval != -EPERM && retval != -ENODEV)
 414                 dev_err(&acm->control->dev,
 415                         "%s - usb_submit_urb failed: %d\n", __func__, retval);
 416         else
 417                 dev_vdbg(&acm->control->dev,
 418                         "control resubmission terminated %d\n", retval);
 419 }
 420
 421 static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
 422 {
 423         int res;
 424
 425         if (!test_and_clear_bit(index, &acm->read_urbs_free))
 426                 return 0;
 427
 428         res = usb_submit_urb(acm->read_urbs[index], mem_flags);
 429         if (res) {
 430                 if (res != -EPERM && res != -ENODEV) {
 431                         dev_err(&acm->data->dev,
 432                                 "urb %d failed submission with %d\n",
 433                                 index, res);
 434                 } else {
 435                         dev_vdbg(&acm->data->dev, "intended failure %d\n", res);
 436                 }
 437                 set_bit(index, &acm->read_urbs_free);
 438                 return res;
 439         } else {
 440                 dev_vdbg(&acm->data->dev, "submitted urb %d\n", index);
 441         }
 442
 443         return 0;
 444 }
 445
 446 static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
 447 {
 448         int res;
 449         int i;
 450
 451         for (i = 0; i < acm->rx_buflimit; ++i) {
 452                 res = acm_submit_read_urb(acm, i, mem_flags);
 453                 if (res)
 454                         return res;
 455         }
 456
 457         return 0;
 458 }
 459
 460 static void acm_process_read_urb(struct acm *acm, struct urb *urb)
 461 {
 462         if (!urb->actual_length)
 463                 return;
 464
 465         tty_insert_flip_string(&acm->port, urb->transfer_buffer,
 466                         urb->actual_length);
 467         tty_flip_buffer_push(&acm->port);
 468 }
 469
 470 static void acm_read_bulk_callback(struct urb *urb)
 471 {
 472         struct acm_rb *rb = urb->context;
 473         struct acm *acm = rb->instance;
 474         int status = urb->status;
 475         bool stopped = false;
 476         bool stalled = false;
 477         bool cooldown = false;
 478
 479         dev_vdbg(&acm->data->dev, "got urb %d, len %d, status %d\n",
 480                 rb->index, urb->actual_length, status);
 481
 482         if (!acm->dev) {
 483                 dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
 484                 return;
 485         }
 486
 487         switch (status) {
 488         case 0:
 489                 usb_mark_last_busy(acm->dev);
 490                 acm_process_read_urb(acm, urb);
 491                 break;
 492         case -EPIPE:
 493                 set_bit(EVENT_RX_STALL, &acm->flags);
 494                 stalled = true;
 495                 break;
 496         case -ENOENT:
 497         case -ECONNRESET:
 498         case -ESHUTDOWN:
 499                 dev_dbg(&acm->data->dev,
 500                         "%s - urb shutting down with status: %d\n",
 501                         __func__, status);
 502                 stopped = true;
 503                 break;
 504         case -EOVERFLOW:
 505         case -EPROTO:
 506                 dev_dbg(&acm->data->dev,
 507                         "%s - cooling babbling device\n", __func__);
 508                 usb_mark_last_busy(acm->dev);
 509                 set_bit(rb->index, &acm->urbs_in_error_delay);
 510                 cooldown = true;
 511                 break;
 512         default:
 513                 dev_dbg(&acm->data->dev,
 514                         "%s - nonzero urb status received: %d\n",
 515                         __func__, status);
 516                 break;
 517         }
 518
 519         /*
 520          * Make sure URB processing is done before marking as free to avoid
 521          * racing with unthrottle() on another CPU. Matches the barriers
 522          * implied by the test_and_clear_bit() in acm_submit_read_urb().
 523          */
 524         smp_mb__before_atomic();
 525         set_bit(rb->index, &acm->read_urbs_free);
 526         /*
 527          * Make sure URB is marked as free before checking the throttled flag
 528          * to avoid racing with unthrottle() on another CPU. Matches the
 529          * smp_mb() in unthrottle().
 530          */
 531         smp_mb__after_atomic();
 532
 533         if (stopped || stalled || cooldown) {
 534                 if (stalled)
 535                         schedule_work(&acm->work);
 536                 else if (cooldown)
 537                         schedule_delayed_work(&acm->dwork, HZ / 2);
 538                 return;
 539         }
 540
 541         if (test_bit(ACM_THROTTLED, &acm->flags))
 542                 return;
 543
 544         acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
 545 }
 546
 547 /* data interface wrote those outgoing bytes */
 548 static void acm_write_bulk(struct urb *urb)
 549 {
 550         struct acm_wb *wb = urb->context;
 551         struct acm *acm = wb->instance;
 552         unsigned long flags;
 553         int status = urb->status;
 554
 555         if (status || (urb->actual_length != urb->transfer_buffer_length))
 556                 dev_vdbg(&acm->data->dev, "wrote len %d/%d, status %d\n",
 557                         urb->actual_length,
 558                         urb->transfer_buffer_length,
 559                         status);
 560
 561         spin_lock_irqsave(&acm->write_lock, flags);
 562         acm_write_done(acm, wb);
 563         spin_unlock_irqrestore(&acm->write_lock, flags);
 564         set_bit(EVENT_TTY_WAKEUP, &acm->flags);
 565         schedule_work(&acm->work);
 566 }
 567
 568 static void acm_softint(struct work_struct *work)
 569 {
 570         int i;
 571         struct acm *acm = container_of(work, struct acm, work);
 572
 573         if (test_bit(EVENT_RX_STALL, &acm->flags)) {
 574                 smp_mb(); /* against acm_suspend() */
 575                 if (!acm->susp_count) {
 576                         for (i = 0; i < acm->rx_buflimit; i++)
 577                                 usb_kill_urb(acm->read_urbs[i]);
 578                         usb_clear_halt(acm->dev, acm->in);
 579                         acm_submit_read_urbs(acm, GFP_KERNEL);
 580                         clear_bit(EVENT_RX_STALL, &acm->flags);
 581                 }
 582         }
 583
 584         if (test_and_clear_bit(ACM_ERROR_DELAY, &acm->flags)) {
 585                 for (i = 0; i < acm->rx_buflimit; i++)
 586                         if (test_and_clear_bit(i, &acm->urbs_in_error_delay))
 587                                         acm_submit_read_urb(acm, i, GFP_NOIO);
 588         }
 589
 590         if (test_and_clear_bit(EVENT_TTY_WAKEUP, &acm->flags))
 591                 tty_port_tty_wakeup(&acm->port);
 592 }
 593
 594 /*
 595  * TTY handlers
 596  */
 597
 598 static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
 599 {
 600         struct acm *acm;
 601         int retval;
 602
 603         acm = acm_get_by_minor(tty->index);
 604         if (!acm)
 605                 return -ENODEV;
 606
 607         retval = tty_standard_install(driver, tty);
 608         if (retval)
 609                 goto error_init_termios;
 610
 611         /*
 612          * Suppress initial echoing for some devices which might send data
 613          * immediately after acm driver has been installed.
 614          */
 615         if (acm->quirks & DISABLE_ECHO)
 616                 tty->termios.c_lflag &= ~ECHO;
 617
 618         tty->driver_data = acm;
 619
 620         return 0;
 621
 622 error_init_termios:
 623         tty_port_put(&acm->port);
 624         return retval;
 625 }
 626
 627 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
 628 {
 629         struct acm *acm = tty->driver_data;
 630
 631         return tty_port_open(&acm->port, tty, filp);
 632 }
 633
 634 static void acm_port_dtr_rts(struct tty_port *port, int raise)
 635 {
 636         struct acm *acm = container_of(port, struct acm, port);
 637         int val;
 638         int res;
 639
 640         if (raise)
 641                 val = ACM_CTRL_DTR | ACM_CTRL_RTS;
 642         else
 643                 val = 0;
 644
 645         /* FIXME: add missing ctrlout locking throughout driver */
 646         acm->ctrlout = val;
 647
 648         res = acm_set_control(acm, val);
 649         if (res && (acm->ctrl_caps & USB_CDC_CAP_LINE))
 650                 dev_err(&acm->control->dev, "failed to set dtr/rts\n");
 651 }
 652
 653 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
 654 {
 655         struct acm *acm = container_of(port, struct acm, port);
 656         int retval = -ENODEV;
 657         int i;
 658
 659         mutex_lock(&acm->mutex);
 660         if (acm->disconnected)
 661                 goto disconnected;
 662
 663         retval = usb_autopm_get_interface(acm->control);
 664         if (retval)
 665                 goto error_get_interface;
 666
 667         /*
 668          * FIXME: Why do we need this? Allocating 64K of physically contiguous
 669          * memory is really nasty...
 670          */
 671         set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
 672         acm->control->needs_remote_wakeup = 1;
 673
 674         acm->ctrlurb->dev = acm->dev;
 675         retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
 676         if (retval) {
 677                 dev_err(&acm->control->dev,
 678                         "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
 679                 goto error_submit_urb;
 680         }
 681
 682         acm_tty_set_termios(tty, NULL);
 683
 684         /*
 685          * Unthrottle device in case the TTY was closed while throttled.
 686          */
 687         clear_bit(ACM_THROTTLED, &acm->flags);
 688
 689         retval = acm_submit_read_urbs(acm, GFP_KERNEL);
 690         if (retval)
 691                 goto error_submit_read_urbs;
 692
 693         usb_autopm_put_interface(acm->control);
 694
 695         mutex_unlock(&acm->mutex);
 696
 697         return 0;
 698
 699 error_submit_read_urbs:
 700         for (i = 0; i < acm->rx_buflimit; i++)
 701                 usb_kill_urb(acm->read_urbs[i]);
 702         usb_kill_urb(acm->ctrlurb);
 703 error_submit_urb:
 704         usb_autopm_put_interface(acm->control);
 705 error_get_interface:
 706 disconnected:
 707         mutex_unlock(&acm->mutex);
 708
 709         return usb_translate_errors(retval);
 710 }
 711
 712 static void acm_port_destruct(struct tty_port *port)
 713 {
 714         struct acm *acm = container_of(port, struct acm, port);
 715
 716         acm_release_minor(acm);
 717         usb_put_intf(acm->control);
 718         kfree(acm->country_codes);
 719         kfree(acm);
 720 }
 721
 722 static void acm_port_shutdown(struct tty_port *port)
 723 {
 724         struct acm *acm = container_of(port, struct acm, port);
 725         struct urb *urb;
 726         struct acm_wb *wb;
 727
 728         /*
 729          * Need to grab write_lock to prevent race with resume, but no need to
 730          * hold it due to the tty-port initialised flag.
 731          */
 732         spin_lock_irq(&acm->write_lock);
 733         spin_unlock_irq(&acm->write_lock);
 734
 735         usb_autopm_get_interface_no_resume(acm->control);
 736         acm->control->needs_remote_wakeup = 0;
 737         usb_autopm_put_interface(acm->control);
 738
 739         for (;;) {
 740                 urb = usb_get_from_anchor(&acm->delayed);
 741                 if (!urb)
 742                         break;
 743                 wb = urb->context;
 744                 wb->use = 0;
 745                 usb_autopm_put_interface_async(acm->control);
 746         }
 747
 748         acm_kill_urbs(acm);
 749 }
 750
 751 static void acm_tty_cleanup(struct tty_struct *tty)
 752 {
 753         struct acm *acm = tty->driver_data;
 754
 755         tty_port_put(&acm->port);
 756 }
 757
 758 static void acm_tty_hangup(struct tty_struct *tty)
 759 {
 760         struct acm *acm = tty->driver_data;
 761
 762         tty_port_hangup(&acm->port);
 763 }
 764
 765 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
 766 {
 767         struct acm *acm = tty->driver_data;
 768
 769         tty_port_close(&acm->port, tty, filp);
 770 }
 771
 772 static int acm_tty_write(struct tty_struct *tty,
 773                                         const unsigned char *buf, int count)
 774 {
 775         struct acm *acm = tty->driver_data;
 776         int stat;
 777         unsigned long flags;
 778         int wbn;
 779         struct acm_wb *wb;
 780
 781         if (!count)
 782                 return 0;
 783
 784         dev_vdbg(&acm->data->dev, "%d bytes from tty layer\n", count);
 785
 786         spin_lock_irqsave(&acm->write_lock, flags);
 787         wbn = acm_wb_alloc(acm);
 788         if (wbn < 0) {
 789                 spin_unlock_irqrestore(&acm->write_lock, flags);
 790                 return 0;
 791         }
 792         wb = &acm->wb[wbn];
 793
 794         if (!acm->dev) {
 795                 wb->use = 0;
 796                 spin_unlock_irqrestore(&acm->write_lock, flags);
 797                 return -ENODEV;
 798         }
 799
 800         count = (count > acm->writesize) ? acm->writesize : count;
 801         dev_vdbg(&acm->data->dev, "writing %d bytes\n", count);
 802         memcpy(wb->buf, buf, count);
 803         wb->len = count;
 804
 805         stat = usb_autopm_get_interface_async(acm->control);
 806         if (stat) {
 807                 wb->use = 0;
 808                 spin_unlock_irqrestore(&acm->write_lock, flags);
 809                 return stat;
 810         }
 811
 812         if (acm->susp_count) {
 813                 usb_anchor_urb(wb->urb, &acm->delayed);
 814                 spin_unlock_irqrestore(&acm->write_lock, flags);
 815                 return count;
 816         }
 817
 818         stat = acm_start_wb(acm, wb);
 819         spin_unlock_irqrestore(&acm->write_lock, flags);
 820
 821         if (stat < 0)
 822                 return stat;
 823         return count;
 824 }
 825
 826 static int acm_tty_write_room(struct tty_struct *tty)
 827 {
 828         struct acm *acm = tty->driver_data;
 829         /*
 830          * Do not let the line discipline to know that we have a reserve,
 831          * or it might get too enthusiastic.
 832          */
 833         return acm_wb_is_avail(acm) ? acm->writesize : 0;
 834 }
 835
 836 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
 837 {
 838         struct acm *acm = tty->driver_data;
 839         /*
 840          * if the device was unplugged then any remaining characters fell out
 841          * of the connector ;)
 842          */
 843         if (acm->disconnected)
 844                 return 0;
 845         /*
 846          * This is inaccurate (overcounts), but it works.
 847          */
 848         return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
 849 }
 850
 851 static void acm_tty_throttle(struct tty_struct *tty)
 852 {
 853         struct acm *acm = tty->driver_data;
 854
 855         set_bit(ACM_THROTTLED, &acm->flags);
 856 }
 857
 858 static void acm_tty_unthrottle(struct tty_struct *tty)
 859 {
 860         struct acm *acm = tty->driver_data;
 861
 862         clear_bit(ACM_THROTTLED, &acm->flags);
 863
 864         /* Matches the smp_mb__after_atomic() in acm_read_bulk_callback(). */
 865         smp_mb();
 866
 867         acm_submit_read_urbs(acm, GFP_KERNEL);
 868 }
 869
 870 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
 871 {
 872         struct acm *acm = tty->driver_data;
 873         int retval;
 874
 875         retval = acm_send_break(acm, state ? 0xffff : 0);
 876         if (retval < 0)
 877                 dev_dbg(&acm->control->dev,
 878                         "%s - send break failed\n", __func__);
 879         return retval;
 880 }
 881
 882 static int acm_tty_tiocmget(struct tty_struct *tty)
 883 {
 884         struct acm *acm = tty->driver_data;
 885
 886         return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
 887                (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
 888                (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
 889                (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
 890                (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
 891                TIOCM_CTS;
 892 }
 893
 894 static int acm_tty_tiocmset(struct tty_struct *tty,
 895                             unsigned int set, unsigned int clear)
 896 {
 897         struct acm *acm = tty->driver_data;
 898         unsigned int newctrl;
 899
 900         newctrl = acm->ctrlout;
 901         set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 902                                         (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 903         clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 904                                         (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 905
 906         newctrl = (newctrl & ~clear) | set;
 907
 908         if (acm->ctrlout == newctrl)
 909                 return 0;
 910         return acm_set_control(acm, acm->ctrlout = newctrl);
 911 }
 912
 913 static int get_serial_info(struct tty_struct *tty, struct serial_struct *ss)
 914 {
 915         struct acm *acm = tty->driver_data;
 916
 917         ss->xmit_fifo_size = acm->writesize;
 918         ss->baud_base = le32_to_cpu(acm->line.dwDTERate);
 919         ss->close_delay = jiffies_to_msecs(acm->port.close_delay) / 10;
 920         ss->closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 921                                 ASYNC_CLOSING_WAIT_NONE :
 922                                 jiffies_to_msecs(acm->port.closing_wait) / 10;
 923         return 0;
 924 }
 925
 926 static int set_serial_info(struct tty_struct *tty, struct serial_struct *ss)
 927 {
 928         struct acm *acm = tty->driver_data;
 929         unsigned int closing_wait, close_delay;
 930         unsigned int old_closing_wait, old_close_delay;
 931         int retval = 0;
 932
 933         close_delay = msecs_to_jiffies(ss->close_delay * 10);
 934         closing_wait = ss->closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 935                         ASYNC_CLOSING_WAIT_NONE :
 936                         msecs_to_jiffies(ss->closing_wait * 10);
 937
 938         /* we must redo the rounding here, so that the values match */
 939         old_close_delay = jiffies_to_msecs(acm->port.close_delay) / 10;
 940         old_closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 941                                 ASYNC_CLOSING_WAIT_NONE :
 942                                 jiffies_to_msecs(acm->port.closing_wait) / 10;
 943
 944         mutex_lock(&acm->port.mutex);
 945
 946         if (!capable(CAP_SYS_ADMIN)) {
 947                 if ((ss->close_delay != old_close_delay) ||
 948                     (ss->closing_wait != old_closing_wait))
 949                         retval = -EPERM;
 950                 else
 951                         retval = -EOPNOTSUPP;
 952         } else {
 953                 acm->port.close_delay  = close_delay;
 954                 acm->port.closing_wait = closing_wait;
 955         }
 956
 957         mutex_unlock(&acm->port.mutex);
 958         return retval;
 959 }
 960
 961 static int wait_serial_change(struct acm *acm, unsigned long arg)
 962 {
 963         int rv = 0;
 964         DECLARE_WAITQUEUE(wait, current);
 965         struct async_icount old, new;
 966
 967         do {
 968                 spin_lock_irq(&acm->read_lock);
 969                 old = acm->oldcount;
 970                 new = acm->iocount;
 971                 acm->oldcount = new;
 972                 spin_unlock_irq(&acm->read_lock);
 973
 974                 if ((arg & TIOCM_DSR) &&
 975                         old.dsr != new.dsr)
 976                         break;
 977                 if ((arg & TIOCM_CD)  &&
 978                         old.dcd != new.dcd)
 979                         break;
 980                 if ((arg & TIOCM_RI) &&
 981                         old.rng != new.rng)
 982                         break;
 983
 984                 add_wait_queue(&acm->wioctl, &wait);
 985                 set_current_state(TASK_INTERRUPTIBLE);
 986                 schedule();
 987                 remove_wait_queue(&acm->wioctl, &wait);
 988                 if (acm->disconnected) {
 989                         if (arg & TIOCM_CD)
 990                                 break;
 991                         else
 992                                 rv = -ENODEV;
 993                 } else {
 994                         if (signal_pending(current))
 995                                 rv = -ERESTARTSYS;
 996                 }
 997         } while (!rv);
 998
 999
1000
1001         return rv;
1002 }
1003
1004 static int acm_tty_get_icount(struct tty_struct *tty,
1005                                         struct serial_icounter_struct *icount)
1006 {
1007         struct acm *acm = tty->driver_data;
1008
1009         icount->dsr = acm->iocount.dsr;
1010         icount->rng = acm->iocount.rng;
1011         icount->dcd = acm->iocount.dcd;
1012         icount->frame = acm->iocount.frame;
1013         icount->overrun = acm->iocount.overrun;
1014         icount->parity = acm->iocount.parity;
1015         icount->brk = acm->iocount.brk;
1016
1017         return 0;
1018 }
1019
1020 static int acm_tty_ioctl(struct tty_struct *tty,
1021                                         unsigned int cmd, unsigned long arg)
1022 {
1023         struct acm *acm = tty->driver_data;
1024         int rv = -ENOIOCTLCMD;
1025
1026         switch (cmd) {
1027         case TIOCMIWAIT:
1028                 rv = usb_autopm_get_interface(acm->control);
1029                 if (rv < 0) {
1030                         rv = -EIO;
1031                         break;
1032                 }
1033                 rv = wait_serial_change(acm, arg);
1034                 usb_autopm_put_interface(acm->control);
1035                 break;
1036         }
1037
1038         return rv;
1039 }
1040
1041 static void acm_tty_set_termios(struct tty_struct *tty,
1042                                                 struct ktermios *termios_old)
1043 {
1044         struct acm *acm = tty->driver_data;
1045         struct ktermios *termios = &tty->termios;
1046         struct usb_cdc_line_coding newline;
1047         int newctrl = acm->ctrlout;
1048
1049         newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
1050         newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
1051         newline.bParityType = termios->c_cflag & PARENB ?
1052                                 (termios->c_cflag & PARODD ? 1 : 2) +
1053                                 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
1054         switch (termios->c_cflag & CSIZE) {
1055         case CS5:
1056                 newline.bDataBits = 5;
1057                 break;
1058         case CS6:
1059                 newline.bDataBits = 6;
1060                 break;
1061         case CS7:
1062                 newline.bDataBits = 7;
1063                 break;
1064         case CS8:
1065         default:
1066                 newline.bDataBits = 8;
1067                 break;
1068         }
1069         /* FIXME: Needs to clear unsupported bits in the termios */
1070         acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
1071
1072         if (C_BAUD(tty) == B0) {
1073                 newline.dwDTERate = acm->line.dwDTERate;
1074                 newctrl &= ~ACM_CTRL_DTR;
1075         } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
1076                 newctrl |=  ACM_CTRL_DTR;
1077         }
1078
1079         if (newctrl != acm->ctrlout)
1080                 acm_set_control(acm, acm->ctrlout = newctrl);
1081
1082         if (memcmp(&acm->line, &newline, sizeof newline)) {
1083                 memcpy(&acm->line, &newline, sizeof newline);
1084                 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
1085                         __func__,
1086                         le32_to_cpu(newline.dwDTERate),
1087                         newline.bCharFormat, newline.bParityType,
1088                         newline.bDataBits);
1089                 acm_set_line(acm, &acm->line);
1090         }
1091 }
1092
1093 static const struct tty_port_operations acm_port_ops = {
1094         .dtr_rts = acm_port_dtr_rts,
1095         .shutdown = acm_port_shutdown,
1096         .activate = acm_port_activate,
1097         .destruct = acm_port_destruct,
1098 };
1099
1100 /*
1101  * USB probe and disconnect routines.
1102  */
1103
1104 /* Little helpers: write/read buffers free */
1105 static void acm_write_buffers_free(struct acm *acm)
1106 {
1107         int i;
1108         struct acm_wb *wb;
1109
1110         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1111                 usb_free_coherent(acm->dev, acm->writesize, wb->buf, wb->dmah);
1112 }
1113
1114 static void acm_read_buffers_free(struct acm *acm)
1115 {
1116         int i;
1117
1118         for (i = 0; i < acm->rx_buflimit; i++)
1119                 usb_free_coherent(acm->dev, acm->readsize,
1120                           acm->read_buffers[i].base, acm->read_buffers[i].dma);
1121 }
1122
1123 /* Little helper: write buffers allocate */
1124 static int acm_write_buffers_alloc(struct acm *acm)
1125 {
1126         int i;
1127         struct acm_wb *wb;
1128
1129         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1130                 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1131                     &wb->dmah);
1132                 if (!wb->buf) {
1133                         while (i != 0) {
1134                                 --i;
1135                                 --wb;
1136                                 usb_free_coherent(acm->dev, acm->writesize,
1137                                     wb->buf, wb->dmah);
1138                         }
1139                         return -ENOMEM;
1140                 }
1141         }
1142         return 0;
1143 }
1144
1145 static int acm_probe(struct usb_interface *intf,
1146                      const struct usb_device_id *id)
1147 {
1148         struct usb_cdc_union_desc *union_header = NULL;
1149         struct usb_cdc_call_mgmt_descriptor *cmgmd = NULL;
1150         unsigned char *buffer = intf->altsetting->extra;
1151         int buflen = intf->altsetting->extralen;
1152         struct usb_interface *control_interface;
1153         struct usb_interface *data_interface;
1154         struct usb_endpoint_descriptor *epctrl = NULL;
1155         struct usb_endpoint_descriptor *epread = NULL;
1156         struct usb_endpoint_descriptor *epwrite = NULL;
1157         struct usb_device *usb_dev = interface_to_usbdev(intf);
1158         struct usb_cdc_parsed_header h;
1159         struct acm *acm;
1160         int minor;
1161         int ctrlsize, readsize;
1162         u8 *buf;
1163         int call_intf_num = -1;
1164         int data_intf_num = -1;
1165         unsigned long quirks;
1166         int num_rx_buf;
1167         int i;
1168         int combined_interfaces = 0;
1169         struct device *tty_dev;
1170         int rv = -ENOMEM;
1171         int res;
1172
1173         /* normal quirks */
1174         quirks = (unsigned long)id->driver_info;
1175
1176         if (quirks == IGNORE_DEVICE)
1177                 return -ENODEV;
1178
1179         memset(&h, 0x00, sizeof(struct usb_cdc_parsed_header));
1180
1181         num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1182
1183         /* handle quirks deadly to normal probing*/
1184         if (quirks == NO_UNION_NORMAL) {
1185                 data_interface = usb_ifnum_to_if(usb_dev, 1);
1186                 control_interface = usb_ifnum_to_if(usb_dev, 0);
1187                 /* we would crash */
1188                 if (!data_interface || !control_interface)
1189                         return -ENODEV;
1190                 goto skip_normal_probe;
1191         }
1192
1193         /* normal probing*/
1194         if (!buffer) {
1195                 dev_err(&intf->dev, "Weird descriptor references\n");
1196                 return -EINVAL;
1197         }
1198
1199         if (!intf->cur_altsetting)
1200                 return -EINVAL;
1201
1202         if (!buflen) {
1203                 if (intf->cur_altsetting->endpoint &&
1204                                 intf->cur_altsetting->endpoint->extralen &&
1205                                 intf->cur_altsetting->endpoint->extra) {
1206                         dev_dbg(&intf->dev,
1207                                 "Seeking extra descriptors on endpoint\n");
1208                         buflen = intf->cur_altsetting->endpoint->extralen;
1209                         buffer = intf->cur_altsetting->endpoint->extra;
1210                 } else {
1211                         dev_err(&intf->dev,
1212                                 "Zero length descriptor references\n");
1213                         return -EINVAL;
1214                 }
1215         }
1216
1217         cdc_parse_cdc_header(&h, intf, buffer, buflen);
1218         union_header = h.usb_cdc_union_desc;
1219         cmgmd = h.usb_cdc_call_mgmt_descriptor;
1220         if (cmgmd)
1221                 call_intf_num = cmgmd->bDataInterface;
1222
1223         if (!union_header) {
1224                 if (call_intf_num > 0) {
1225                         dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1226                         /* quirks for Droids MuIn LCD */
1227                         if (quirks & NO_DATA_INTERFACE) {
1228                                 data_interface = usb_ifnum_to_if(usb_dev, 0);
1229                         } else {
1230                                 data_intf_num = call_intf_num;
1231                                 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1232                         }
1233                         control_interface = intf;
1234                 } else {
1235                         if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1236                                 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1237                                 return -ENODEV;
1238                         } else {
1239                                 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1240                                 combined_interfaces = 1;
1241                                 control_interface = data_interface = intf;
1242                                 goto look_for_collapsed_interface;
1243                         }
1244                 }
1245         } else {
1246                 data_intf_num = union_header->bSlaveInterface0;
1247                 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1248                 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1249         }
1250
1251         if (!control_interface || !data_interface) {
1252                 dev_dbg(&intf->dev, "no interfaces\n");
1253                 return -ENODEV;
1254         }
1255         if (!data_interface->cur_altsetting || !control_interface->cur_altsetting)
1256                 return -ENODEV;
1257
1258         if (data_intf_num != call_intf_num)
1259                 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1260
1261         if (control_interface == data_interface) {
1262                 /* some broken devices designed for windows work this way */
1263                 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1264                 combined_interfaces = 1;
1265                 /* a popular other OS doesn't use it */
1266                 quirks |= NO_CAP_LINE;
1267                 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1268                         dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1269                         return -EINVAL;
1270                 }
1271 look_for_collapsed_interface:
1272                 res = usb_find_common_endpoints(data_interface->cur_altsetting,
1273                                 &epread, &epwrite, &epctrl, NULL);
1274                 if (res)
1275                         return res;
1276
1277                 goto made_compressed_probe;
1278         }
1279
1280 skip_normal_probe:
1281
1282         /*workaround for switched interfaces */
1283         if (data_interface->cur_altsetting->desc.bInterfaceClass
1284                                                 != CDC_DATA_INTERFACE_TYPE) {
1285                 if (control_interface->cur_altsetting->desc.bInterfaceClass
1286                                                 == CDC_DATA_INTERFACE_TYPE) {
1287                         dev_dbg(&intf->dev,
1288                                 "Your device has switched interfaces.\n");
1289                         swap(control_interface, data_interface);
1290                 } else {
1291                         return -EINVAL;
1292                 }
1293         }
1294
1295         /* Accept probe requests only for the control interface */
1296         if (!combined_interfaces && intf != control_interface)
1297                 return -ENODEV;
1298
1299         if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1300                 /* valid in this context */
1301                 dev_dbg(&intf->dev, "The data interface isn't available\n");
1302                 return -EBUSY;
1303         }
1304
1305
1306         if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1307             control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1308                 return -EINVAL;
1309
1310         epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1311         epread = &data_interface->cur_altsetting->endpoint[0].desc;
1312         epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1313
1314
1315         /* workaround for switched endpoints */
1316         if (!usb_endpoint_dir_in(epread)) {
1317                 /* descriptors are swapped */
1318                 dev_dbg(&intf->dev,
1319                         "The data interface has switched endpoints\n");
1320                 swap(epread, epwrite);
1321         }
1322 made_compressed_probe:
1323         dev_dbg(&intf->dev, "interfaces are valid\n");
1324
1325         acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1326         if (acm == NULL)
1327                 goto alloc_fail;
1328
1329         tty_port_init(&acm->port);
1330         acm->port.ops = &acm_port_ops;
1331
1332         ctrlsize = usb_endpoint_maxp(epctrl);
1333         readsize = usb_endpoint_maxp(epread) *
1334                                 (quirks == SINGLE_RX_URB ? 1 : 2);
1335         acm->combined_interfaces = combined_interfaces;
1336         acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1337         acm->control = control_interface;
1338         acm->data = data_interface;
1339
1340         usb_get_intf(acm->control); /* undone in destruct() */
1341
1342         minor = acm_alloc_minor(acm);
1343         if (minor < 0)
1344                 goto alloc_fail1;
1345
1346         acm->minor = minor;
1347         acm->dev = usb_dev;
1348         if (h.usb_cdc_acm_descriptor)
1349                 acm->ctrl_caps = h.usb_cdc_acm_descriptor->bmCapabilities;
1350         if (quirks & NO_CAP_LINE)
1351                 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1352         acm->ctrlsize = ctrlsize;
1353         acm->readsize = readsize;
1354         acm->rx_buflimit = num_rx_buf;
1355         INIT_WORK(&acm->work, acm_softint);
1356         INIT_DELAYED_WORK(&acm->dwork, acm_softint);
1357         init_waitqueue_head(&acm->wioctl);
1358         spin_lock_init(&acm->write_lock);
1359         spin_lock_init(&acm->read_lock);
1360         mutex_init(&acm->mutex);
1361         if (usb_endpoint_xfer_int(epread)) {
1362                 acm->bInterval = epread->bInterval;
1363                 acm->in = usb_rcvintpipe(usb_dev, epread->bEndpointAddress);
1364         } else {
1365                 acm->in = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1366         }
1367         if (usb_endpoint_xfer_int(epwrite))
1368                 acm->out = usb_sndintpipe(usb_dev, epwrite->bEndpointAddress);
1369         else
1370                 acm->out = usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress);
1371         init_usb_anchor(&acm->delayed);
1372         acm->quirks = quirks;
1373
1374         buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1375         if (!buf)
1376                 goto alloc_fail1;
1377         acm->ctrl_buffer = buf;
1378
1379         if (acm_write_buffers_alloc(acm) < 0)
1380                 goto alloc_fail2;
1381
1382         acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1383         if (!acm->ctrlurb)
1384                 goto alloc_fail3;
1385
1386         for (i = 0; i < num_rx_buf; i++) {
1387                 struct acm_rb *rb = &(acm->read_buffers[i]);
1388                 struct urb *urb;
1389
1390                 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1391                                                                 &rb->dma);
1392                 if (!rb->base)
1393                         goto alloc_fail4;
1394                 rb->index = i;
1395                 rb->instance = acm;
1396
1397                 urb = usb_alloc_urb(0, GFP_KERNEL);
1398                 if (!urb)
1399                         goto alloc_fail4;
1400
1401                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1402                 urb->transfer_dma = rb->dma;
1403                 if (usb_endpoint_xfer_int(epread))
1404                         usb_fill_int_urb(urb, acm->dev, acm->in, rb->base,
1405                                          acm->readsize,
1406                                          acm_read_bulk_callback, rb,
1407                                          acm->bInterval);
1408                 else
1409                         usb_fill_bulk_urb(urb, acm->dev, acm->in, rb->base,
1410                                           acm->readsize,
1411                                           acm_read_bulk_callback, rb);
1412
1413                 acm->read_urbs[i] = urb;
1414                 __set_bit(i, &acm->read_urbs_free);
1415         }
1416         for (i = 0; i < ACM_NW; i++) {
1417                 struct acm_wb *snd = &(acm->wb[i]);
1418
1419                 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1420                 if (snd->urb == NULL)
1421                         goto alloc_fail5;
1422
1423                 if (usb_endpoint_xfer_int(epwrite))
1424                         usb_fill_int_urb(snd->urb, usb_dev, acm->out,
1425                                 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1426                 else
1427                         usb_fill_bulk_urb(snd->urb, usb_dev, acm->out,
1428                                 NULL, acm->writesize, acm_write_bulk, snd);
1429                 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1430                 if (quirks & SEND_ZERO_PACKET)
1431                         snd->urb->transfer_flags |= URB_ZERO_PACKET;
1432                 snd->instance = acm;
1433         }
1434
1435         usb_set_intfdata(intf, acm);
1436
1437         i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1438         if (i < 0)
1439                 goto alloc_fail5;
1440
1441         if (h.usb_cdc_country_functional_desc) { /* export the country data */
1442                 struct usb_cdc_country_functional_desc * cfd =
1443                                         h.usb_cdc_country_functional_desc;
1444
1445                 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1446                 if (!acm->country_codes)
1447                         goto skip_countries;
1448                 acm->country_code_size = cfd->bLength - 4;
1449                 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1450                                                         cfd->bLength - 4);
1451                 acm->country_rel_date = cfd->iCountryCodeRelDate;
1452
1453                 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1454                 if (i < 0) {
1455                         kfree(acm->country_codes);
1456                         acm->country_codes = NULL;
1457                         acm->country_code_size = 0;
1458                         goto skip_countries;
1459                 }
1460
1461                 i = device_create_file(&intf->dev,
1462                                                 &dev_attr_iCountryCodeRelDate);
1463                 if (i < 0) {
1464                         device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1465                         kfree(acm->country_codes);
1466                         acm->country_codes = NULL;
1467                         acm->country_code_size = 0;
1468                         goto skip_countries;
1469                 }
1470         }
1471
1472 skip_countries:
1473         usb_fill_int_urb(acm->ctrlurb, usb_dev,
1474                          usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1475                          acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1476                          /* works around buggy devices */
1477                          epctrl->bInterval ? epctrl->bInterval : 16);
1478         acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1479         acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1480         acm->notification_buffer = NULL;
1481         acm->nb_index = 0;
1482         acm->nb_size = 0;
1483
1484         dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1485
1486         acm->line.dwDTERate = cpu_to_le32(9600);
1487         acm->line.bDataBits = 8;
1488         acm_set_line(acm, &acm->line);
1489
1490         usb_driver_claim_interface(&acm_driver, data_interface, acm);
1491         usb_set_intfdata(data_interface, acm);
1492
1493         tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1494                         &control_interface->dev);
1495         if (IS_ERR(tty_dev)) {
1496                 rv = PTR_ERR(tty_dev);
1497                 goto alloc_fail6;
1498         }
1499
1500         if (quirks & CLEAR_HALT_CONDITIONS) {
1501                 usb_clear_halt(usb_dev, acm->in);
1502                 usb_clear_halt(usb_dev, acm->out);
1503         }
1504
1505         return 0;
1506 alloc_fail6:
1507         if (acm->country_codes) {
1508                 device_remove_file(&acm->control->dev,
1509                                 &dev_attr_wCountryCodes);
1510                 device_remove_file(&acm->control->dev,
1511                                 &dev_attr_iCountryCodeRelDate);
1512                 kfree(acm->country_codes);
1513         }
1514         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1515 alloc_fail5:
1516         usb_set_intfdata(intf, NULL);
1517         for (i = 0; i < ACM_NW; i++)
1518                 usb_free_urb(acm->wb[i].urb);
1519 alloc_fail4:
1520         for (i = 0; i < num_rx_buf; i++)
1521                 usb_free_urb(acm->read_urbs[i]);
1522         acm_read_buffers_free(acm);
1523         usb_free_urb(acm->ctrlurb);
1524 alloc_fail3:
1525         acm_write_buffers_free(acm);
1526 alloc_fail2:
1527         usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1528 alloc_fail1:
1529         tty_port_put(&acm->port);
1530 alloc_fail:
1531         return rv;
1532 }
1533
1534 static void acm_disconnect(struct usb_interface *intf)
1535 {
1536         struct acm *acm = usb_get_intfdata(intf);
1537         struct tty_struct *tty;
1538         int i;
1539
1540         /* sibling interface is already cleaning up */
1541         if (!acm)
1542                 return;
1543
1544         mutex_lock(&acm->mutex);
1545         acm->disconnected = true;
1546         if (acm->country_codes) {
1547                 device_remove_file(&acm->control->dev,
1548                                 &dev_attr_wCountryCodes);
1549                 device_remove_file(&acm->control->dev,
1550                                 &dev_attr_iCountryCodeRelDate);
1551         }
1552         wake_up_all(&acm->wioctl);
1553         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1554         usb_set_intfdata(acm->control, NULL);
1555         usb_set_intfdata(acm->data, NULL);
1556         mutex_unlock(&acm->mutex);
1557
1558         tty = tty_port_tty_get(&acm->port);
1559         if (tty) {
1560                 tty_vhangup(tty);
1561                 tty_kref_put(tty);
1562         }
1563
1564         acm_kill_urbs(acm);
1565         cancel_work_sync(&acm->work);
1566         cancel_delayed_work_sync(&acm->dwork);
1567
1568         tty_unregister_device(acm_tty_driver, acm->minor);
1569
1570         usb_free_urb(acm->ctrlurb);
1571         for (i = 0; i < ACM_NW; i++)
1572                 usb_free_urb(acm->wb[i].urb);
1573         for (i = 0; i < acm->rx_buflimit; i++)
1574                 usb_free_urb(acm->read_urbs[i]);
1575         acm_write_buffers_free(acm);
1576         usb_free_coherent(acm->dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1577         acm_read_buffers_free(acm);
1578
1579         kfree(acm->notification_buffer);
1580
1581         if (!acm->combined_interfaces)
1582                 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1583                                         acm->data : acm->control);
1584
1585         tty_port_put(&acm->port);
1586 }
1587
1588 #ifdef CONFIG_PM
1589 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1590 {
1591         struct acm *acm = usb_get_intfdata(intf);
1592         int cnt;
1593
1594         spin_lock_irq(&acm->write_lock);
1595         if (PMSG_IS_AUTO(message)) {
1596                 if (acm->transmitting) {
1597                         spin_unlock_irq(&acm->write_lock);
1598                         return -EBUSY;
1599                 }
1600         }
1601         cnt = acm->susp_count++;
1602         spin_unlock_irq(&acm->write_lock);
1603
1604         if (cnt)
1605                 return 0;
1606
1607         acm_kill_urbs(acm);
1608         cancel_work_sync(&acm->work);
1609         cancel_delayed_work_sync(&acm->dwork);
1610         acm->urbs_in_error_delay = 0;
1611
1612         return 0;
1613 }
1614
1615 static int acm_resume(struct usb_interface *intf)
1616 {
1617         struct acm *acm = usb_get_intfdata(intf);
1618         struct urb *urb;
1619         int rv = 0;
1620
1621         spin_lock_irq(&acm->write_lock);
1622
1623         if (--acm->susp_count)
1624                 goto out;
1625
1626         if (tty_port_initialized(&acm->port)) {
1627                 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1628
1629                 for (;;) {
1630                         urb = usb_get_from_anchor(&acm->delayed);
1631                         if (!urb)
1632                                 break;
1633
1634                         acm_start_wb(acm, urb->context);
1635                 }
1636
1637                 /*
1638                  * delayed error checking because we must
1639                  * do the write path at all cost
1640                  */
1641                 if (rv < 0)
1642                         goto out;
1643
1644                 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1645         }
1646 out:
1647         spin_unlock_irq(&acm->write_lock);
1648
1649         return rv;
1650 }
1651
1652 static int acm_reset_resume(struct usb_interface *intf)
1653 {
1654         struct acm *acm = usb_get_intfdata(intf);
1655
1656         if (tty_port_initialized(&acm->port))
1657                 tty_port_tty_hangup(&acm->port, false);
1658
1659         return acm_resume(intf);
1660 }
1661
1662 #endif /* CONFIG_PM */
1663
1664 static int acm_pre_reset(struct usb_interface *intf)
1665 {
1666         struct acm *acm = usb_get_intfdata(intf);
1667
1668         clear_bit(EVENT_RX_STALL, &acm->flags);
1669         acm->nb_index = 0; /* pending control transfers are lost */
1670
1671         return 0;
1672 }
1673
1674 #define NOKIA_PCSUITE_ACM_INFO(x) \
1675                 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1676                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1677                 USB_CDC_ACM_PROTO_VENDOR)
1678
1679 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1680                 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1681                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1682                 USB_CDC_ACM_PROTO_VENDOR)
1683
1684 /*
1685  * USB driver structure.
1686  */
1687
1688 static const struct usb_device_id acm_ids[] = {
1689         /* quirky and broken devices */
1690         { USB_DEVICE(0x0424, 0x274e), /* Microchip Technology, Inc. (formerly SMSC) */
1691           .driver_info = DISABLE_ECHO, }, /* DISABLE ECHO in termios flag */
1692         { USB_DEVICE(0x076d, 0x0006), /* Denso Cradle CU-321 */
1693         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1694         { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1695         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1696         { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1697         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1698         },
1699         { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1700         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1701         },
1702         { USB_DEVICE(0x0e8d, 0x2000), /* MediaTek Inc Preloader */
1703         .driver_info = DISABLE_ECHO, /* DISABLE ECHO in termios flag */
1704         },
1705         { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1706         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1707         },
1708         { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1709         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1710         },
1711         { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1712         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1713         },
1714         { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1715         .driver_info = SINGLE_RX_URB,
1716         },
1717         { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1718         .driver_info = SINGLE_RX_URB, /* firmware bug */
1719         },
1720         { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1721         .driver_info = SINGLE_RX_URB, /* firmware bug */
1722         },
1723         { USB_DEVICE(0x11ca, 0x0201), /* VeriFone Mx870 Gadget Serial */
1724         .driver_info = SINGLE_RX_URB,
1725         },
1726         { USB_DEVICE(0x1965, 0x0018), /* Uniden UBC125XLT */
1727         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1728         },
1729         { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1730         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1731         },
1732         { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1733         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1734         },
1735         { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1736         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1737         },
1738         { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1739         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1740         },
1741         { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1742         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1743         },
1744         { USB_DEVICE(0x0572, 0x1349), /* Hiro (Conexant) USB MODEM H50228 */
1745         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1746         },
1747         { USB_DEVICE(0x20df, 0x0001), /* Simtec Electronics Entropy Key */
1748         .driver_info = QUIRK_CONTROL_LINE_STATE, },
1749         { USB_DEVICE(0x2184, 0x001c) }, /* GW Instek AFG-2225 */
1750         { USB_DEVICE(0x2184, 0x0036) }, /* GW Instek AFG-125 */
1751         { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1752         },
1753         /* Motorola H24 HSPA module: */
1754         { USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1755         { USB_DEVICE(0x22b8, 0x2d92),   /* modem           + diagnostics        */
1756         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1757         },
1758         { USB_DEVICE(0x22b8, 0x2d93),   /* modem + AT port                      */
1759         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1760         },
1761         { USB_DEVICE(0x22b8, 0x2d95),   /* modem + AT port + diagnostics        */
1762         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1763         },
1764         { USB_DEVICE(0x22b8, 0x2d96),   /* modem                         + NMEA */
1765         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1766         },
1767         { USB_DEVICE(0x22b8, 0x2d97),   /* modem           + diagnostics + NMEA */
1768         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1769         },
1770         { USB_DEVICE(0x22b8, 0x2d99),   /* modem + AT port               + NMEA */
1771         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1772         },
1773         { USB_DEVICE(0x22b8, 0x2d9a),   /* modem + AT port + diagnostics + NMEA */
1774         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1775         },
1776
1777         { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1778         .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1779                                            data interface instead of
1780                                            communications interface.
1781                                            Maybe we should define a new
1782                                            quirk for this. */
1783         },
1784         { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1785         .driver_info = NO_UNION_NORMAL,
1786         },
1787         { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1788         .driver_info = NO_UNION_NORMAL,
1789         },
1790         { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1791         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1792         },
1793         { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1794         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1795         },
1796         { USB_DEVICE(0xfff0, 0x0100), /* DATECS FP-2000 */
1797         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1798         },
1799         { USB_DEVICE(0x09d8, 0x0320), /* Elatec GmbH TWN3 */
1800         .driver_info = NO_UNION_NORMAL, /* has misplaced union descriptor */
1801         },
1802         { USB_DEVICE(0x0ca6, 0xa050), /* Castles VEGA3000 */
1803         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1804         },
1805
1806         { USB_DEVICE(0x2912, 0x0001), /* ATOL FPrint */
1807         .driver_info = CLEAR_HALT_CONDITIONS,
1808         },
1809
1810         /* Nokia S60 phones expose two ACM channels. The first is
1811          * a modem and is picked up by the standard AT-command
1812          * information below. The second is 'vendor-specific' but
1813          * is treated as a serial device at the S60 end, so we want
1814          * to expose it on Linux too. */
1815         { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1816         { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1817         { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1818         { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1819         { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1820         { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1821         { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1822         { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1823         { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1824         { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1825         { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1826         { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1827         { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1828         { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1829         { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1830         { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1831         { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1832         { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1833         { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1834         { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1835         { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1836         { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1837         { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1838         { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1839         { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1840         { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1841         { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1842         { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1843         { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1844         { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1845         { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1846         { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
1847         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1848         { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1849         { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1850         { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1851         { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1852         { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1853         { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1854         { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1855         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1856         { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1857         { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1858         { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1859         { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1860         { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1861         { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1862         { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1863         { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1864         { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1865         { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1866         { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1867         { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1868         { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1869         { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1870         { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1871         { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1872         { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1873
1874         /* Support for Owen devices */
1875         { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1876
1877         /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1878
1879         /* Support for Droids MuIn LCD */
1880         { USB_DEVICE(0x04d8, 0x000b),
1881         .driver_info = NO_DATA_INTERFACE,
1882         },
1883
1884 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1885         { USB_DEVICE(0x04d8, 0x0082),   /* Application mode */
1886         .driver_info = IGNORE_DEVICE,
1887         },
1888         { USB_DEVICE(0x04d8, 0x0083),   /* Bootloader mode */
1889         .driver_info = IGNORE_DEVICE,
1890         },
1891 #endif
1892
1893 #if IS_ENABLED(CONFIG_IR_TOY)
1894         { USB_DEVICE(0x04d8, 0xfd08),
1895         .driver_info = IGNORE_DEVICE,
1896         },
1897 #endif
1898
1899         /*Samsung phone in firmware update mode */
1900         { USB_DEVICE(0x04e8, 0x685d),
1901         .driver_info = IGNORE_DEVICE,
1902         },
1903
1904         /* Exclude Infineon Flash Loader utility */
1905         { USB_DEVICE(0x058b, 0x0041),
1906         .driver_info = IGNORE_DEVICE,
1907         },
1908
1909         { USB_DEVICE(0x1bc7, 0x0021), /* Telit 3G ACM only composition */
1910         .driver_info = SEND_ZERO_PACKET,
1911         },
1912         { USB_DEVICE(0x1bc7, 0x0023), /* Telit 3G ACM + ECM composition */
1913         .driver_info = SEND_ZERO_PACKET,
1914         },
1915
1916         /* control interfaces without any protocol set */
1917         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1918                 USB_CDC_PROTO_NONE) },
1919
1920         /* control interfaces with various AT-command sets */
1921         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1922                 USB_CDC_ACM_PROTO_AT_V25TER) },
1923         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1924                 USB_CDC_ACM_PROTO_AT_PCCA101) },
1925         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1926                 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1927         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1928                 USB_CDC_ACM_PROTO_AT_GSM) },
1929         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1930                 USB_CDC_ACM_PROTO_AT_3G) },
1931         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1932                 USB_CDC_ACM_PROTO_AT_CDMA) },
1933
1934         { USB_DEVICE(0x1519, 0x0452), /* Intel 7260 modem */
1935         .driver_info = SEND_ZERO_PACKET,
1936         },
1937
1938         { }
1939 };
1940
1941 MODULE_DEVICE_TABLE(usb, acm_ids);
1942
1943 static struct usb_driver acm_driver = {
1944         .name =         "cdc_acm",
1945         .probe =        acm_probe,
1946         .disconnect =   acm_disconnect,
1947 #ifdef CONFIG_PM
1948         .suspend =      acm_suspend,
1949         .resume =       acm_resume,
1950         .reset_resume = acm_reset_resume,
1951 #endif
1952         .pre_reset =    acm_pre_reset,
1953         .id_table =     acm_ids,
1954 #ifdef CONFIG_PM
1955         .supports_autosuspend = 1,
1956 #endif
1957         .disable_hub_initiated_lpm = 1,
1958 };
1959
1960 /*
1961  * TTY driver structures.
1962  */
1963
1964 static const struct tty_operations acm_ops = {
1965         .install =              acm_tty_install,
1966         .open =                 acm_tty_open,
1967         .close =                acm_tty_close,
1968         .cleanup =              acm_tty_cleanup,
1969         .hangup =               acm_tty_hangup,
1970         .write =                acm_tty_write,
1971         .write_room =           acm_tty_write_room,
1972         .ioctl =                acm_tty_ioctl,
1973         .throttle =             acm_tty_throttle,
1974         .unthrottle =           acm_tty_unthrottle,
1975         .chars_in_buffer =      acm_tty_chars_in_buffer,
1976         .break_ctl =            acm_tty_break_ctl,
1977         .set_termios =          acm_tty_set_termios,
1978         .tiocmget =             acm_tty_tiocmget,
1979         .tiocmset =             acm_tty_tiocmset,
1980         .get_serial =           get_serial_info,
1981         .set_serial =           set_serial_info,
1982         .get_icount =           acm_tty_get_icount,
1983 };
1984
1985 /*
1986  * Init / exit.
1987  */
1988
1989 static int __init acm_init(void)
1990 {
1991         int retval;
1992         acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1993         if (!acm_tty_driver)
1994                 return -ENOMEM;
1995         acm_tty_driver->driver_name = "acm",
1996         acm_tty_driver->name = "ttyACM",
1997         acm_tty_driver->major = ACM_TTY_MAJOR,
1998         acm_tty_driver->minor_start = 0,
1999         acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
2000         acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
2001         acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
2002         acm_tty_driver->init_termios = tty_std_termios;
2003         acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
2004                                                                 HUPCL | CLOCAL;
2005         tty_set_operations(acm_tty_driver, &acm_ops);
2006
2007         retval = tty_register_driver(acm_tty_driver);
2008         if (retval) {
2009                 put_tty_driver(acm_tty_driver);
2010                 return retval;
2011         }
2012
2013         retval = usb_register(&acm_driver);
2014         if (retval) {
2015                 tty_unregister_driver(acm_tty_driver);
2016                 put_tty_driver(acm_tty_driver);
2017                 return retval;
2018         }
2019
2020         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
2021
2022         return 0;
2023 }
2024
2025 static void __exit acm_exit(void)
2026 {
2027         usb_deregister(&acm_driver);
2028         tty_unregister_driver(acm_tty_driver);
2029         put_tty_driver(acm_tty_driver);
2030         idr_destroy(&acm_minors);
2031 }
2032
2033 module_init(acm_init);
2034 module_exit(acm_exit);
2035
2036 MODULE_AUTHOR(DRIVER_AUTHOR);
2037 MODULE_DESCRIPTION(DRIVER_DESC);
2038 MODULE_LICENSE("GPL");
2039 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);