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                         return wbn;
 178                 }
 179                 wbn = (wbn + 1) % ACM_NW;
 180                 if (++i >= ACM_NW)
 181                         return -1;
 182         }
 183 }
 184
 185 static int acm_wb_is_avail(struct acm *acm)
 186 {
 187         int i, n;
 188         unsigned long flags;
 189
 190         n = ACM_NW;
 191         spin_lock_irqsave(&acm->write_lock, flags);
 192         for (i = 0; i < ACM_NW; i++)
 193                 n -= acm->wb[i].use;
 194         spin_unlock_irqrestore(&acm->write_lock, flags);
 195         return n;
 196 }
 197
 198 /*
 199  * Finish write. Caller must hold acm->write_lock
 200  */
 201 static void acm_write_done(struct acm *acm, struct acm_wb *wb)
 202 {
 203         wb->use = 0;
 204         acm->transmitting--;
 205         usb_autopm_put_interface_async(acm->control);
 206 }
 207
 208 /*
 209  * Poke write.
 210  *
 211  * the caller is responsible for locking
 212  */
 213
 214 static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
 215 {
 216         int rc;
 217
 218         acm->transmitting++;
 219
 220         wb->urb->transfer_buffer = wb->buf;
 221         wb->urb->transfer_dma = wb->dmah;
 222         wb->urb->transfer_buffer_length = wb->len;
 223         wb->urb->dev = acm->dev;
 224
 225         rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
 226         if (rc < 0) {
 227                 dev_err(&acm->data->dev,
 228                         "%s - usb_submit_urb(write bulk) failed: %d\n",
 229                         __func__, rc);
 230                 acm_write_done(acm, wb);
 231         }
 232         return rc;
 233 }
 234
 235 /*
 236  * attributes exported through sysfs
 237  */
 238 static ssize_t show_caps
 239 (struct device *dev, struct device_attribute *attr, char *buf)
 240 {
 241         struct usb_interface *intf = to_usb_interface(dev);
 242         struct acm *acm = usb_get_intfdata(intf);
 243
 244         return sprintf(buf, "%d", acm->ctrl_caps);
 245 }
 246 static DEVICE_ATTR(bmCapabilities, S_IRUGO, show_caps, NULL);
 247
 248 static ssize_t show_country_codes
 249 (struct device *dev, struct device_attribute *attr, char *buf)
 250 {
 251         struct usb_interface *intf = to_usb_interface(dev);
 252         struct acm *acm = usb_get_intfdata(intf);
 253
 254         memcpy(buf, acm->country_codes, acm->country_code_size);
 255         return acm->country_code_size;
 256 }
 257
 258 static DEVICE_ATTR(wCountryCodes, S_IRUGO, show_country_codes, NULL);
 259
 260 static ssize_t show_country_rel_date
 261 (struct device *dev, struct device_attribute *attr, char *buf)
 262 {
 263         struct usb_interface *intf = to_usb_interface(dev);
 264         struct acm *acm = usb_get_intfdata(intf);
 265
 266         return sprintf(buf, "%d", acm->country_rel_date);
 267 }
 268
 269 static DEVICE_ATTR(iCountryCodeRelDate, S_IRUGO, show_country_rel_date, NULL);
 270 /*
 271  * Interrupt handlers for various ACM device responses
 272  */
 273
 274 static void acm_process_notification(struct acm *acm, unsigned char *buf)
 275 {
 276         int newctrl;
 277         int difference;
 278         struct usb_cdc_notification *dr = (struct usb_cdc_notification *)buf;
 279         unsigned char *data = buf + sizeof(struct usb_cdc_notification);
 280
 281         switch (dr->bNotificationType) {
 282         case USB_CDC_NOTIFY_NETWORK_CONNECTION:
 283                 dev_dbg(&acm->control->dev,
 284                         "%s - network connection: %d\n", __func__, dr->wValue);
 285                 break;
 286
 287         case USB_CDC_NOTIFY_SERIAL_STATE:
 288                 if (le16_to_cpu(dr->wLength) != 2) {
 289                         dev_dbg(&acm->control->dev,
 290                                 "%s - malformed serial state\n", __func__);
 291                         break;
 292                 }
 293
 294                 newctrl = get_unaligned_le16(data);
 295                 dev_dbg(&acm->control->dev,
 296                         "%s - serial state: 0x%x\n", __func__, newctrl);
 297
 298                 if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
 299                         dev_dbg(&acm->control->dev,
 300                                 "%s - calling hangup\n", __func__);
 301                         tty_port_tty_hangup(&acm->port, false);
 302                 }
 303
 304                 difference = acm->ctrlin ^ newctrl;
 305                 spin_lock(&acm->read_lock);
 306                 acm->ctrlin = newctrl;
 307                 acm->oldcount = acm->iocount;
 308
 309                 if (difference & ACM_CTRL_DSR)
 310                         acm->iocount.dsr++;
 311                 if (difference & ACM_CTRL_BRK)
 312                         acm->iocount.brk++;
 313                 if (difference & ACM_CTRL_RI)
 314                         acm->iocount.rng++;
 315                 if (difference & ACM_CTRL_DCD)
 316                         acm->iocount.dcd++;
 317                 if (difference & ACM_CTRL_FRAMING)
 318                         acm->iocount.frame++;
 319                 if (difference & ACM_CTRL_PARITY)
 320                         acm->iocount.parity++;
 321                 if (difference & ACM_CTRL_OVERRUN)
 322                         acm->iocount.overrun++;
 323                 spin_unlock(&acm->read_lock);
 324
 325                 if (difference)
 326                         wake_up_all(&acm->wioctl);
 327
 328                 break;
 329
 330         default:
 331                 dev_dbg(&acm->control->dev,
 332                         "%s - unknown notification %d received: index %d len %d\n",
 333                         __func__,
 334                         dr->bNotificationType, dr->wIndex, dr->wLength);
 335         }
 336 }
 337
 338 /* control interface reports status changes with "interrupt" transfers */
 339 static void acm_ctrl_irq(struct urb *urb)
 340 {
 341         struct acm *acm = urb->context;
 342         struct usb_cdc_notification *dr = urb->transfer_buffer;
 343         unsigned int current_size = urb->actual_length;
 344         unsigned int expected_size, copy_size, alloc_size;
 345         int retval;
 346         int status = urb->status;
 347
 348         switch (status) {
 349         case 0:
 350                 /* success */
 351                 break;
 352         case -ECONNRESET:
 353         case -ENOENT:
 354         case -ESHUTDOWN:
 355                 /* this urb is terminated, clean up */
 356                 acm->nb_index = 0;
 357                 dev_dbg(&acm->control->dev,
 358                         "%s - urb shutting down with status: %d\n",
 359                         __func__, status);
 360                 return;
 361         default:
 362                 dev_dbg(&acm->control->dev,
 363                         "%s - nonzero urb status received: %d\n",
 364                         __func__, status);
 365                 goto exit;
 366         }
 367
 368         usb_mark_last_busy(acm->dev);
 369
 370         if (acm->nb_index)
 371                 dr = (struct usb_cdc_notification *)acm->notification_buffer;
 372
 373         /* size = notification-header + (optional) data */
 374         expected_size = sizeof(struct usb_cdc_notification) +
 375                                         le16_to_cpu(dr->wLength);
 376
 377         if (current_size < expected_size) {
 378                 /* notification is transmitted fragmented, reassemble */
 379                 if (acm->nb_size < expected_size) {
 380                         if (acm->nb_size) {
 381                                 kfree(acm->notification_buffer);
 382                                 acm->nb_size = 0;
 383                         }
 384                         alloc_size = roundup_pow_of_two(expected_size);
 385                         /*
 386                          * kmalloc ensures a valid notification_buffer after a
 387                          * use of kfree in case the previous allocation was too
 388                          * small. Final freeing is done on disconnect.
 389                          */
 390                         acm->notification_buffer =
 391                                 kmalloc(alloc_size, GFP_ATOMIC);
 392                         if (!acm->notification_buffer)
 393                                 goto exit;
 394                         acm->nb_size = alloc_size;
 395                 }
 396
 397                 copy_size = min(current_size,
 398                                 expected_size - acm->nb_index);
 399
 400                 memcpy(&acm->notification_buffer[acm->nb_index],
 401                        urb->transfer_buffer, copy_size);
 402                 acm->nb_index += copy_size;
 403                 current_size = acm->nb_index;
 404         }
 405
 406         if (current_size >= expected_size) {
 407                 /* notification complete */
 408                 acm_process_notification(acm, (unsigned char *)dr);
 409                 acm->nb_index = 0;
 410         }
 411
 412 exit:
 413         retval = usb_submit_urb(urb, GFP_ATOMIC);
 414         if (retval && retval != -EPERM)
 415                 dev_err(&acm->control->dev,
 416                         "%s - usb_submit_urb failed: %d\n", __func__, retval);
 417 }
 418
 419 static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
 420 {
 421         int res;
 422
 423         if (!test_and_clear_bit(index, &acm->read_urbs_free))
 424                 return 0;
 425
 426         res = usb_submit_urb(acm->read_urbs[index], mem_flags);
 427         if (res) {
 428                 if (res != -EPERM && res != -ENODEV) {
 429                         dev_err(&acm->data->dev,
 430                                 "urb %d failed submission with %d\n",
 431                                 index, res);
 432                 }
 433                 set_bit(index, &acm->read_urbs_free);
 434                 return res;
 435         } else {
 436                 dev_vdbg(&acm->data->dev, "submitted urb %d\n", index);
 437         }
 438
 439         return 0;
 440 }
 441
 442 static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
 443 {
 444         int res;
 445         int i;
 446
 447         for (i = 0; i < acm->rx_buflimit; ++i) {
 448                 res = acm_submit_read_urb(acm, i, mem_flags);
 449                 if (res)
 450                         return res;
 451         }
 452
 453         return 0;
 454 }
 455
 456 static void acm_process_read_urb(struct acm *acm, struct urb *urb)
 457 {
 458         if (!urb->actual_length)
 459                 return;
 460
 461         tty_insert_flip_string(&acm->port, urb->transfer_buffer,
 462                         urb->actual_length);
 463         tty_flip_buffer_push(&acm->port);
 464 }
 465
 466 static void acm_read_bulk_callback(struct urb *urb)
 467 {
 468         struct acm_rb *rb = urb->context;
 469         struct acm *acm = rb->instance;
 470         unsigned long flags;
 471         int status = urb->status;
 472
 473         dev_vdbg(&acm->data->dev, "got urb %d, len %d, status %d\n",
 474                 rb->index, urb->actual_length, status);
 475
 476         set_bit(rb->index, &acm->read_urbs_free);
 477
 478         if (!acm->dev) {
 479                 dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
 480                 return;
 481         }
 482
 483         switch (status) {
 484         case 0:
 485                 usb_mark_last_busy(acm->dev);
 486                 acm_process_read_urb(acm, urb);
 487                 break;
 488         case -EPIPE:
 489                 set_bit(EVENT_RX_STALL, &acm->flags);
 490                 schedule_work(&acm->work);
 491                 return;
 492         case -ENOENT:
 493         case -ECONNRESET:
 494         case -ESHUTDOWN:
 495                 dev_dbg(&acm->data->dev,
 496                         "%s - urb shutting down with status: %d\n",
 497                         __func__, status);
 498                 return;
 499         default:
 500                 dev_dbg(&acm->data->dev,
 501                         "%s - nonzero urb status received: %d\n",
 502                         __func__, status);
 503                 break;
 504         }
 505
 506         /*
 507          * Unthrottle may run on another CPU which needs to see events
 508          * in the same order. Submission has an implict barrier
 509          */
 510         smp_mb__before_atomic();
 511
 512         /* throttle device if requested by tty */
 513         spin_lock_irqsave(&acm->read_lock, flags);
 514         acm->throttled = acm->throttle_req;
 515         if (!acm->throttled) {
 516                 spin_unlock_irqrestore(&acm->read_lock, flags);
 517                 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
 518         } else {
 519                 spin_unlock_irqrestore(&acm->read_lock, flags);
 520         }
 521 }
 522
 523 /* data interface wrote those outgoing bytes */
 524 static void acm_write_bulk(struct urb *urb)
 525 {
 526         struct acm_wb *wb = urb->context;
 527         struct acm *acm = wb->instance;
 528         unsigned long flags;
 529         int status = urb->status;
 530
 531         if (status || (urb->actual_length != urb->transfer_buffer_length))
 532                 dev_vdbg(&acm->data->dev, "wrote len %d/%d, status %d\n",
 533                         urb->actual_length,
 534                         urb->transfer_buffer_length,
 535                         status);
 536
 537         spin_lock_irqsave(&acm->write_lock, flags);
 538         acm_write_done(acm, wb);
 539         spin_unlock_irqrestore(&acm->write_lock, flags);
 540         set_bit(EVENT_TTY_WAKEUP, &acm->flags);
 541         schedule_work(&acm->work);
 542 }
 543
 544 static void acm_softint(struct work_struct *work)
 545 {
 546         int i;
 547         struct acm *acm = container_of(work, struct acm, work);
 548
 549         if (test_bit(EVENT_RX_STALL, &acm->flags)) {
 550                 if (!(usb_autopm_get_interface(acm->data))) {
 551                         for (i = 0; i < acm->rx_buflimit; i++)
 552                                 usb_kill_urb(acm->read_urbs[i]);
 553                         usb_clear_halt(acm->dev, acm->in);
 554                         acm_submit_read_urbs(acm, GFP_KERNEL);
 555                         usb_autopm_put_interface(acm->data);
 556                 }
 557                 clear_bit(EVENT_RX_STALL, &acm->flags);
 558         }
 559
 560         if (test_bit(EVENT_TTY_WAKEUP, &acm->flags)) {
 561                 tty_port_tty_wakeup(&acm->port);
 562                 clear_bit(EVENT_TTY_WAKEUP, &acm->flags);
 563         }
 564 }
 565
 566 /*
 567  * TTY handlers
 568  */
 569
 570 static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
 571 {
 572         struct acm *acm;
 573         int retval;
 574
 575         acm = acm_get_by_minor(tty->index);
 576         if (!acm)
 577                 return -ENODEV;
 578
 579         retval = tty_standard_install(driver, tty);
 580         if (retval)
 581                 goto error_init_termios;
 582
 583         tty->driver_data = acm;
 584
 585         return 0;
 586
 587 error_init_termios:
 588         tty_port_put(&acm->port);
 589         return retval;
 590 }
 591
 592 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
 593 {
 594         struct acm *acm = tty->driver_data;
 595
 596         return tty_port_open(&acm->port, tty, filp);
 597 }
 598
 599 static void acm_port_dtr_rts(struct tty_port *port, int raise)
 600 {
 601         struct acm *acm = container_of(port, struct acm, port);
 602         int val;
 603         int res;
 604
 605         if (raise)
 606                 val = ACM_CTRL_DTR | ACM_CTRL_RTS;
 607         else
 608                 val = 0;
 609
 610         /* FIXME: add missing ctrlout locking throughout driver */
 611         acm->ctrlout = val;
 612
 613         res = acm_set_control(acm, val);
 614         if (res && (acm->ctrl_caps & USB_CDC_CAP_LINE))
 615                 dev_err(&acm->control->dev, "failed to set dtr/rts\n");
 616 }
 617
 618 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
 619 {
 620         struct acm *acm = container_of(port, struct acm, port);
 621         int retval = -ENODEV;
 622         int i;
 623
 624         mutex_lock(&acm->mutex);
 625         if (acm->disconnected)
 626                 goto disconnected;
 627
 628         retval = usb_autopm_get_interface(acm->control);
 629         if (retval)
 630                 goto error_get_interface;
 631
 632         /*
 633          * FIXME: Why do we need this? Allocating 64K of physically contiguous
 634          * memory is really nasty...
 635          */
 636         set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
 637         acm->control->needs_remote_wakeup = 1;
 638
 639         acm->ctrlurb->dev = acm->dev;
 640         retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
 641         if (retval) {
 642                 dev_err(&acm->control->dev,
 643                         "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
 644                 goto error_submit_urb;
 645         }
 646
 647         acm_tty_set_termios(tty, NULL);
 648
 649         /*
 650          * Unthrottle device in case the TTY was closed while throttled.
 651          */
 652         spin_lock_irq(&acm->read_lock);
 653         acm->throttled = 0;
 654         acm->throttle_req = 0;
 655         spin_unlock_irq(&acm->read_lock);
 656
 657         retval = acm_submit_read_urbs(acm, GFP_KERNEL);
 658         if (retval)
 659                 goto error_submit_read_urbs;
 660
 661         usb_autopm_put_interface(acm->control);
 662
 663         mutex_unlock(&acm->mutex);
 664
 665         return 0;
 666
 667 error_submit_read_urbs:
 668         for (i = 0; i < acm->rx_buflimit; i++)
 669                 usb_kill_urb(acm->read_urbs[i]);
 670         usb_kill_urb(acm->ctrlurb);
 671 error_submit_urb:
 672         usb_autopm_put_interface(acm->control);
 673 error_get_interface:
 674 disconnected:
 675         mutex_unlock(&acm->mutex);
 676
 677         return usb_translate_errors(retval);
 678 }
 679
 680 static void acm_port_destruct(struct tty_port *port)
 681 {
 682         struct acm *acm = container_of(port, struct acm, port);
 683
 684         acm_release_minor(acm);
 685         usb_put_intf(acm->control);
 686         kfree(acm->country_codes);
 687         kfree(acm);
 688 }
 689
 690 static void acm_port_shutdown(struct tty_port *port)
 691 {
 692         struct acm *acm = container_of(port, struct acm, port);
 693         struct urb *urb;
 694         struct acm_wb *wb;
 695
 696         /*
 697          * Need to grab write_lock to prevent race with resume, but no need to
 698          * hold it due to the tty-port initialised flag.
 699          */
 700         spin_lock_irq(&acm->write_lock);
 701         spin_unlock_irq(&acm->write_lock);
 702
 703         usb_autopm_get_interface_no_resume(acm->control);
 704         acm->control->needs_remote_wakeup = 0;
 705         usb_autopm_put_interface(acm->control);
 706
 707         for (;;) {
 708                 urb = usb_get_from_anchor(&acm->delayed);
 709                 if (!urb)
 710                         break;
 711                 wb = urb->context;
 712                 wb->use = 0;
 713                 usb_autopm_put_interface_async(acm->control);
 714         }
 715
 716         acm_kill_urbs(acm);
 717 }
 718
 719 static void acm_tty_cleanup(struct tty_struct *tty)
 720 {
 721         struct acm *acm = tty->driver_data;
 722
 723         tty_port_put(&acm->port);
 724 }
 725
 726 static void acm_tty_hangup(struct tty_struct *tty)
 727 {
 728         struct acm *acm = tty->driver_data;
 729
 730         tty_port_hangup(&acm->port);
 731 }
 732
 733 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
 734 {
 735         struct acm *acm = tty->driver_data;
 736
 737         tty_port_close(&acm->port, tty, filp);
 738 }
 739
 740 static int acm_tty_write(struct tty_struct *tty,
 741                                         const unsigned char *buf, int count)
 742 {
 743         struct acm *acm = tty->driver_data;
 744         int stat;
 745         unsigned long flags;
 746         int wbn;
 747         struct acm_wb *wb;
 748
 749         if (!count)
 750                 return 0;
 751
 752         dev_vdbg(&acm->data->dev, "%d bytes from tty layer\n", count);
 753
 754         spin_lock_irqsave(&acm->write_lock, flags);
 755         wbn = acm_wb_alloc(acm);
 756         if (wbn < 0) {
 757                 spin_unlock_irqrestore(&acm->write_lock, flags);
 758                 return 0;
 759         }
 760         wb = &acm->wb[wbn];
 761
 762         if (!acm->dev) {
 763                 wb->use = 0;
 764                 spin_unlock_irqrestore(&acm->write_lock, flags);
 765                 return -ENODEV;
 766         }
 767
 768         count = (count > acm->writesize) ? acm->writesize : count;
 769         dev_vdbg(&acm->data->dev, "writing %d bytes\n", count);
 770         memcpy(wb->buf, buf, count);
 771         wb->len = count;
 772
 773         stat = usb_autopm_get_interface_async(acm->control);
 774         if (stat) {
 775                 wb->use = 0;
 776                 spin_unlock_irqrestore(&acm->write_lock, flags);
 777                 return stat;
 778         }
 779
 780         if (acm->susp_count) {
 781                 if (acm->putbuffer) {
 782                         /* now to preserve order */
 783                         usb_anchor_urb(acm->putbuffer->urb, &acm->delayed);
 784                         acm->putbuffer = NULL;
 785                 }
 786                 usb_anchor_urb(wb->urb, &acm->delayed);
 787                 spin_unlock_irqrestore(&acm->write_lock, flags);
 788                 return count;
 789         } else {
 790                 if (acm->putbuffer) {
 791                         /* at this point there is no good way to handle errors */
 792                         acm_start_wb(acm, acm->putbuffer);
 793                         acm->putbuffer = NULL;
 794                 }
 795         }
 796
 797         stat = acm_start_wb(acm, wb);
 798         spin_unlock_irqrestore(&acm->write_lock, flags);
 799
 800         if (stat < 0)
 801                 return stat;
 802         return count;
 803 }
 804
 805 static void acm_tty_flush_chars(struct tty_struct *tty)
 806 {
 807         struct acm *acm = tty->driver_data;
 808         struct acm_wb *cur = acm->putbuffer;
 809         int err;
 810         unsigned long flags;
 811
 812         if (!cur) /* nothing to do */
 813                 return;
 814
 815         acm->putbuffer = NULL;
 816         err = usb_autopm_get_interface_async(acm->control);
 817         spin_lock_irqsave(&acm->write_lock, flags);
 818         if (err < 0) {
 819                 cur->use = 0;
 820                 acm->putbuffer = cur;
 821                 goto out;
 822         }
 823
 824         if (acm->susp_count)
 825                 usb_anchor_urb(cur->urb, &acm->delayed);
 826         else
 827                 acm_start_wb(acm, cur);
 828 out:
 829         spin_unlock_irqrestore(&acm->write_lock, flags);
 830         return;
 831 }
 832
 833 static int acm_tty_put_char(struct tty_struct *tty, unsigned char ch)
 834 {
 835         struct acm *acm = tty->driver_data;
 836         struct acm_wb *cur;
 837         int wbn;
 838         unsigned long flags;
 839
 840 overflow:
 841         cur = acm->putbuffer;
 842         if (!cur) {
 843                 spin_lock_irqsave(&acm->write_lock, flags);
 844                 wbn = acm_wb_alloc(acm);
 845                 if (wbn >= 0) {
 846                         cur = &acm->wb[wbn];
 847                         acm->putbuffer = cur;
 848                 }
 849                 spin_unlock_irqrestore(&acm->write_lock, flags);
 850                 if (!cur)
 851                         return 0;
 852         }
 853
 854         if (cur->len == acm->writesize) {
 855                 acm_tty_flush_chars(tty);
 856                 goto overflow;
 857         }
 858
 859         cur->buf[cur->len++] = ch;
 860         return 1;
 861 }
 862
 863 static int acm_tty_write_room(struct tty_struct *tty)
 864 {
 865         struct acm *acm = tty->driver_data;
 866         /*
 867          * Do not let the line discipline to know that we have a reserve,
 868          * or it might get too enthusiastic.
 869          */
 870         return acm_wb_is_avail(acm) ? acm->writesize : 0;
 871 }
 872
 873 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
 874 {
 875         struct acm *acm = tty->driver_data;
 876         /*
 877          * if the device was unplugged then any remaining characters fell out
 878          * of the connector ;)
 879          */
 880         if (acm->disconnected)
 881                 return 0;
 882         /*
 883          * This is inaccurate (overcounts), but it works.
 884          */
 885         return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
 886 }
 887
 888 static void acm_tty_throttle(struct tty_struct *tty)
 889 {
 890         struct acm *acm = tty->driver_data;
 891
 892         spin_lock_irq(&acm->read_lock);
 893         acm->throttle_req = 1;
 894         spin_unlock_irq(&acm->read_lock);
 895 }
 896
 897 static void acm_tty_unthrottle(struct tty_struct *tty)
 898 {
 899         struct acm *acm = tty->driver_data;
 900         unsigned int was_throttled;
 901
 902         spin_lock_irq(&acm->read_lock);
 903         was_throttled = acm->throttled;
 904         acm->throttled = 0;
 905         acm->throttle_req = 0;
 906         spin_unlock_irq(&acm->read_lock);
 907
 908         if (was_throttled)
 909                 acm_submit_read_urbs(acm, GFP_KERNEL);
 910 }
 911
 912 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
 913 {
 914         struct acm *acm = tty->driver_data;
 915         int retval;
 916
 917         retval = acm_send_break(acm, state ? 0xffff : 0);
 918         if (retval < 0)
 919                 dev_dbg(&acm->control->dev,
 920                         "%s - send break failed\n", __func__);
 921         return retval;
 922 }
 923
 924 static int acm_tty_tiocmget(struct tty_struct *tty)
 925 {
 926         struct acm *acm = tty->driver_data;
 927
 928         return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
 929                (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
 930                (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
 931                (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
 932                (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
 933                TIOCM_CTS;
 934 }
 935
 936 static int acm_tty_tiocmset(struct tty_struct *tty,
 937                             unsigned int set, unsigned int clear)
 938 {
 939         struct acm *acm = tty->driver_data;
 940         unsigned int newctrl;
 941
 942         newctrl = acm->ctrlout;
 943         set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 944                                         (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 945         clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 946                                         (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 947
 948         newctrl = (newctrl & ~clear) | set;
 949
 950         if (acm->ctrlout == newctrl)
 951                 return 0;
 952         return acm_set_control(acm, acm->ctrlout = newctrl);
 953 }
 954
 955 static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
 956 {
 957         struct serial_struct tmp;
 958
 959         memset(&tmp, 0, sizeof(tmp));
 960         tmp.xmit_fifo_size = acm->writesize;
 961         tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
 962         tmp.close_delay = acm->port.close_delay / 10;
 963         tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 964                                 ASYNC_CLOSING_WAIT_NONE :
 965                                 acm->port.closing_wait / 10;
 966
 967         if (copy_to_user(info, &tmp, sizeof(tmp)))
 968                 return -EFAULT;
 969         else
 970                 return 0;
 971 }
 972
 973 static int set_serial_info(struct acm *acm,
 974                                 struct serial_struct __user *newinfo)
 975 {
 976         struct serial_struct new_serial;
 977         unsigned int closing_wait, close_delay;
 978         int retval = 0;
 979
 980         if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
 981                 return -EFAULT;
 982
 983         close_delay = new_serial.close_delay * 10;
 984         closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 985                         ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
 986
 987         mutex_lock(&acm->port.mutex);
 988
 989         if (!capable(CAP_SYS_ADMIN)) {
 990                 if ((close_delay != acm->port.close_delay) ||
 991                     (closing_wait != acm->port.closing_wait))
 992                         retval = -EPERM;
 993                 else
 994                         retval = -EOPNOTSUPP;
 995         } else {
 996                 acm->port.close_delay  = close_delay;
 997                 acm->port.closing_wait = closing_wait;
 998         }
 999
1000         mutex_unlock(&acm->port.mutex);
1001         return retval;
1002 }
1003
1004 static int wait_serial_change(struct acm *acm, unsigned long arg)
1005 {
1006         int rv = 0;
1007         DECLARE_WAITQUEUE(wait, current);
1008         struct async_icount old, new;
1009
1010         do {
1011                 spin_lock_irq(&acm->read_lock);
1012                 old = acm->oldcount;
1013                 new = acm->iocount;
1014                 acm->oldcount = new;
1015                 spin_unlock_irq(&acm->read_lock);
1016
1017                 if ((arg & TIOCM_DSR) &&
1018                         old.dsr != new.dsr)
1019                         break;
1020                 if ((arg & TIOCM_CD)  &&
1021                         old.dcd != new.dcd)
1022                         break;
1023                 if ((arg & TIOCM_RI) &&
1024                         old.rng != new.rng)
1025                         break;
1026
1027                 add_wait_queue(&acm->wioctl, &wait);
1028                 set_current_state(TASK_INTERRUPTIBLE);
1029                 schedule();
1030                 remove_wait_queue(&acm->wioctl, &wait);
1031                 if (acm->disconnected) {
1032                         if (arg & TIOCM_CD)
1033                                 break;
1034                         else
1035                                 rv = -ENODEV;
1036                 } else {
1037                         if (signal_pending(current))
1038                                 rv = -ERESTARTSYS;
1039                 }
1040         } while (!rv);
1041
1042
1043
1044         return rv;
1045 }
1046
1047 static int acm_tty_get_icount(struct tty_struct *tty,
1048                                         struct serial_icounter_struct *icount)
1049 {
1050         struct acm *acm = tty->driver_data;
1051
1052         icount->dsr = acm->iocount.dsr;
1053         icount->rng = acm->iocount.rng;
1054         icount->dcd = acm->iocount.dcd;
1055         icount->frame = acm->iocount.frame;
1056         icount->overrun = acm->iocount.overrun;
1057         icount->parity = acm->iocount.parity;
1058         icount->brk = acm->iocount.brk;
1059
1060         return 0;
1061 }
1062
1063 static int acm_tty_ioctl(struct tty_struct *tty,
1064                                         unsigned int cmd, unsigned long arg)
1065 {
1066         struct acm *acm = tty->driver_data;
1067         int rv = -ENOIOCTLCMD;
1068
1069         switch (cmd) {
1070         case TIOCGSERIAL: /* gets serial port data */
1071                 rv = get_serial_info(acm, (struct serial_struct __user *) arg);
1072                 break;
1073         case TIOCSSERIAL:
1074                 rv = set_serial_info(acm, (struct serial_struct __user *) arg);
1075                 break;
1076         case TIOCMIWAIT:
1077                 rv = usb_autopm_get_interface(acm->control);
1078                 if (rv < 0) {
1079                         rv = -EIO;
1080                         break;
1081                 }
1082                 rv = wait_serial_change(acm, arg);
1083                 usb_autopm_put_interface(acm->control);
1084                 break;
1085         }
1086
1087         return rv;
1088 }
1089
1090 static void acm_tty_set_termios(struct tty_struct *tty,
1091                                                 struct ktermios *termios_old)
1092 {
1093         struct acm *acm = tty->driver_data;
1094         struct ktermios *termios = &tty->termios;
1095         struct usb_cdc_line_coding newline;
1096         int newctrl = acm->ctrlout;
1097
1098         newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
1099         newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
1100         newline.bParityType = termios->c_cflag & PARENB ?
1101                                 (termios->c_cflag & PARODD ? 1 : 2) +
1102                                 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
1103         switch (termios->c_cflag & CSIZE) {
1104         case CS5:
1105                 newline.bDataBits = 5;
1106                 break;
1107         case CS6:
1108                 newline.bDataBits = 6;
1109                 break;
1110         case CS7:
1111                 newline.bDataBits = 7;
1112                 break;
1113         case CS8:
1114         default:
1115                 newline.bDataBits = 8;
1116                 break;
1117         }
1118         /* FIXME: Needs to clear unsupported bits in the termios */
1119         acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
1120
1121         if (C_BAUD(tty) == B0) {
1122                 newline.dwDTERate = acm->line.dwDTERate;
1123                 newctrl &= ~ACM_CTRL_DTR;
1124         } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
1125                 newctrl |=  ACM_CTRL_DTR;
1126         }
1127
1128         if (newctrl != acm->ctrlout)
1129                 acm_set_control(acm, acm->ctrlout = newctrl);
1130
1131         if (memcmp(&acm->line, &newline, sizeof newline)) {
1132                 memcpy(&acm->line, &newline, sizeof newline);
1133                 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
1134                         __func__,
1135                         le32_to_cpu(newline.dwDTERate),
1136                         newline.bCharFormat, newline.bParityType,
1137                         newline.bDataBits);
1138                 acm_set_line(acm, &acm->line);
1139         }
1140 }
1141
1142 static const struct tty_port_operations acm_port_ops = {
1143         .dtr_rts = acm_port_dtr_rts,
1144         .shutdown = acm_port_shutdown,
1145         .activate = acm_port_activate,
1146         .destruct = acm_port_destruct,
1147 };
1148
1149 /*
1150  * USB probe and disconnect routines.
1151  */
1152
1153 /* Little helpers: write/read buffers free */
1154 static void acm_write_buffers_free(struct acm *acm)
1155 {
1156         int i;
1157         struct acm_wb *wb;
1158
1159         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1160                 usb_free_coherent(acm->dev, acm->writesize, wb->buf, wb->dmah);
1161 }
1162
1163 static void acm_read_buffers_free(struct acm *acm)
1164 {
1165         int i;
1166
1167         for (i = 0; i < acm->rx_buflimit; i++)
1168                 usb_free_coherent(acm->dev, acm->readsize,
1169                           acm->read_buffers[i].base, acm->read_buffers[i].dma);
1170 }
1171
1172 /* Little helper: write buffers allocate */
1173 static int acm_write_buffers_alloc(struct acm *acm)
1174 {
1175         int i;
1176         struct acm_wb *wb;
1177
1178         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1179                 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1180                     &wb->dmah);
1181                 if (!wb->buf) {
1182                         while (i != 0) {
1183                                 --i;
1184                                 --wb;
1185                                 usb_free_coherent(acm->dev, acm->writesize,
1186                                     wb->buf, wb->dmah);
1187                         }
1188                         return -ENOMEM;
1189                 }
1190         }
1191         return 0;
1192 }
1193
1194 static int acm_probe(struct usb_interface *intf,
1195                      const struct usb_device_id *id)
1196 {
1197         struct usb_cdc_union_desc *union_header = NULL;
1198         struct usb_cdc_call_mgmt_descriptor *cmgmd = NULL;
1199         unsigned char *buffer = intf->altsetting->extra;
1200         int buflen = intf->altsetting->extralen;
1201         struct usb_interface *control_interface;
1202         struct usb_interface *data_interface;
1203         struct usb_endpoint_descriptor *epctrl = NULL;
1204         struct usb_endpoint_descriptor *epread = NULL;
1205         struct usb_endpoint_descriptor *epwrite = NULL;
1206         struct usb_device *usb_dev = interface_to_usbdev(intf);
1207         struct usb_cdc_parsed_header h;
1208         struct acm *acm;
1209         int minor;
1210         int ctrlsize, readsize;
1211         u8 *buf;
1212         int call_intf_num = -1;
1213         int data_intf_num = -1;
1214         unsigned long quirks;
1215         int num_rx_buf;
1216         int i;
1217         int combined_interfaces = 0;
1218         struct device *tty_dev;
1219         int rv = -ENOMEM;
1220         int res;
1221
1222         /* normal quirks */
1223         quirks = (unsigned long)id->driver_info;
1224
1225         if (quirks == IGNORE_DEVICE)
1226                 return -ENODEV;
1227
1228         memset(&h, 0x00, sizeof(struct usb_cdc_parsed_header));
1229
1230         num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1231
1232         /* handle quirks deadly to normal probing*/
1233         if (quirks == NO_UNION_NORMAL) {
1234                 data_interface = usb_ifnum_to_if(usb_dev, 1);
1235                 control_interface = usb_ifnum_to_if(usb_dev, 0);
1236                 /* we would crash */
1237                 if (!data_interface || !control_interface)
1238                         return -ENODEV;
1239                 goto skip_normal_probe;
1240         }
1241
1242         /* normal probing*/
1243         if (!buffer) {
1244                 dev_err(&intf->dev, "Weird descriptor references\n");
1245                 return -EINVAL;
1246         }
1247
1248         if (!intf->cur_altsetting)
1249                 return -EINVAL;
1250
1251         if (!buflen) {
1252                 if (intf->cur_altsetting->endpoint &&
1253                                 intf->cur_altsetting->endpoint->extralen &&
1254                                 intf->cur_altsetting->endpoint->extra) {
1255                         dev_dbg(&intf->dev,
1256                                 "Seeking extra descriptors on endpoint\n");
1257                         buflen = intf->cur_altsetting->endpoint->extralen;
1258                         buffer = intf->cur_altsetting->endpoint->extra;
1259                 } else {
1260                         dev_err(&intf->dev,
1261                                 "Zero length descriptor references\n");
1262                         return -EINVAL;
1263                 }
1264         }
1265
1266         cdc_parse_cdc_header(&h, intf, buffer, buflen);
1267         union_header = h.usb_cdc_union_desc;
1268         cmgmd = h.usb_cdc_call_mgmt_descriptor;
1269         if (cmgmd)
1270                 call_intf_num = cmgmd->bDataInterface;
1271
1272         if (!union_header) {
1273                 if (call_intf_num > 0) {
1274                         dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1275                         /* quirks for Droids MuIn LCD */
1276                         if (quirks & NO_DATA_INTERFACE) {
1277                                 data_interface = usb_ifnum_to_if(usb_dev, 0);
1278                         } else {
1279                                 data_intf_num = call_intf_num;
1280                                 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1281                         }
1282                         control_interface = intf;
1283                 } else {
1284                         if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1285                                 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1286                                 return -ENODEV;
1287                         } else {
1288                                 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1289                                 combined_interfaces = 1;
1290                                 control_interface = data_interface = intf;
1291                                 goto look_for_collapsed_interface;
1292                         }
1293                 }
1294         } else {
1295                 data_intf_num = union_header->bSlaveInterface0;
1296                 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1297                 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1298         }
1299
1300         if (!control_interface || !data_interface) {
1301                 dev_dbg(&intf->dev, "no interfaces\n");
1302                 return -ENODEV;
1303         }
1304         if (!data_interface->cur_altsetting || !control_interface->cur_altsetting)
1305                 return -ENODEV;
1306
1307         if (data_intf_num != call_intf_num)
1308                 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1309
1310         if (control_interface == data_interface) {
1311                 /* some broken devices designed for windows work this way */
1312                 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1313                 combined_interfaces = 1;
1314                 /* a popular other OS doesn't use it */
1315                 quirks |= NO_CAP_LINE;
1316                 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1317                         dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1318                         return -EINVAL;
1319                 }
1320 look_for_collapsed_interface:
1321                 res = usb_find_common_endpoints(data_interface->cur_altsetting,
1322                                 &epread, &epwrite, &epctrl, NULL);
1323                 if (res)
1324                         return res;
1325
1326                 goto made_compressed_probe;
1327         }
1328
1329 skip_normal_probe:
1330
1331         /*workaround for switched interfaces */
1332         if (data_interface->cur_altsetting->desc.bInterfaceClass
1333                                                 != CDC_DATA_INTERFACE_TYPE) {
1334                 if (control_interface->cur_altsetting->desc.bInterfaceClass
1335                                                 == CDC_DATA_INTERFACE_TYPE) {
1336                         dev_dbg(&intf->dev,
1337                                 "Your device has switched interfaces.\n");
1338                         swap(control_interface, data_interface);
1339                 } else {
1340                         return -EINVAL;
1341                 }
1342         }
1343
1344         /* Accept probe requests only for the control interface */
1345         if (!combined_interfaces && intf != control_interface)
1346                 return -ENODEV;
1347
1348         if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1349                 /* valid in this context */
1350                 dev_dbg(&intf->dev, "The data interface isn't available\n");
1351                 return -EBUSY;
1352         }
1353
1354
1355         if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1356             control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1357                 return -EINVAL;
1358
1359         epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1360         epread = &data_interface->cur_altsetting->endpoint[0].desc;
1361         epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1362
1363
1364         /* workaround for switched endpoints */
1365         if (!usb_endpoint_dir_in(epread)) {
1366                 /* descriptors are swapped */
1367                 dev_dbg(&intf->dev,
1368                         "The data interface has switched endpoints\n");
1369                 swap(epread, epwrite);
1370         }
1371 made_compressed_probe:
1372         dev_dbg(&intf->dev, "interfaces are valid\n");
1373
1374         acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1375         if (acm == NULL)
1376                 goto alloc_fail;
1377
1378         minor = acm_alloc_minor(acm);
1379         if (minor < 0)
1380                 goto alloc_fail1;
1381
1382         ctrlsize = usb_endpoint_maxp(epctrl);
1383         readsize = usb_endpoint_maxp(epread) *
1384                                 (quirks == SINGLE_RX_URB ? 1 : 2);
1385         acm->combined_interfaces = combined_interfaces;
1386         acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1387         acm->control = control_interface;
1388         acm->data = data_interface;
1389         acm->minor = minor;
1390         acm->dev = usb_dev;
1391         if (h.usb_cdc_acm_descriptor)
1392                 acm->ctrl_caps = h.usb_cdc_acm_descriptor->bmCapabilities;
1393         if (quirks & NO_CAP_LINE)
1394                 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1395         acm->ctrlsize = ctrlsize;
1396         acm->readsize = readsize;
1397         acm->rx_buflimit = num_rx_buf;
1398         INIT_WORK(&acm->work, acm_softint);
1399         init_waitqueue_head(&acm->wioctl);
1400         spin_lock_init(&acm->write_lock);
1401         spin_lock_init(&acm->read_lock);
1402         mutex_init(&acm->mutex);
1403         if (usb_endpoint_xfer_int(epread)) {
1404                 acm->bInterval = epread->bInterval;
1405                 acm->in = usb_rcvintpipe(usb_dev, epread->bEndpointAddress);
1406         } else {
1407                 acm->in = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1408         }
1409         if (usb_endpoint_xfer_int(epwrite))
1410                 acm->out = usb_sndintpipe(usb_dev, epwrite->bEndpointAddress);
1411         else
1412                 acm->out = usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress);
1413         tty_port_init(&acm->port);
1414         acm->port.ops = &acm_port_ops;
1415         init_usb_anchor(&acm->delayed);
1416         acm->quirks = quirks;
1417
1418         buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1419         if (!buf)
1420                 goto alloc_fail2;
1421         acm->ctrl_buffer = buf;
1422
1423         if (acm_write_buffers_alloc(acm) < 0)
1424                 goto alloc_fail4;
1425
1426         acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1427         if (!acm->ctrlurb)
1428                 goto alloc_fail5;
1429
1430         for (i = 0; i < num_rx_buf; i++) {
1431                 struct acm_rb *rb = &(acm->read_buffers[i]);
1432                 struct urb *urb;
1433
1434                 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1435                                                                 &rb->dma);
1436                 if (!rb->base)
1437                         goto alloc_fail6;
1438                 rb->index = i;
1439                 rb->instance = acm;
1440
1441                 urb = usb_alloc_urb(0, GFP_KERNEL);
1442                 if (!urb)
1443                         goto alloc_fail6;
1444
1445                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1446                 urb->transfer_dma = rb->dma;
1447                 if (usb_endpoint_xfer_int(epread))
1448                         usb_fill_int_urb(urb, acm->dev, acm->in, rb->base,
1449                                          acm->readsize,
1450                                          acm_read_bulk_callback, rb,
1451                                          acm->bInterval);
1452                 else
1453                         usb_fill_bulk_urb(urb, acm->dev, acm->in, rb->base,
1454                                           acm->readsize,
1455                                           acm_read_bulk_callback, rb);
1456
1457                 acm->read_urbs[i] = urb;
1458                 __set_bit(i, &acm->read_urbs_free);
1459         }
1460         for (i = 0; i < ACM_NW; i++) {
1461                 struct acm_wb *snd = &(acm->wb[i]);
1462
1463                 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1464                 if (snd->urb == NULL)
1465                         goto alloc_fail7;
1466
1467                 if (usb_endpoint_xfer_int(epwrite))
1468                         usb_fill_int_urb(snd->urb, usb_dev, acm->out,
1469                                 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1470                 else
1471                         usb_fill_bulk_urb(snd->urb, usb_dev, acm->out,
1472                                 NULL, acm->writesize, acm_write_bulk, snd);
1473                 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1474                 if (quirks & SEND_ZERO_PACKET)
1475                         snd->urb->transfer_flags |= URB_ZERO_PACKET;
1476                 snd->instance = acm;
1477         }
1478
1479         usb_set_intfdata(intf, acm);
1480
1481         i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1482         if (i < 0)
1483                 goto alloc_fail7;
1484
1485         if (h.usb_cdc_country_functional_desc) { /* export the country data */
1486                 struct usb_cdc_country_functional_desc * cfd =
1487                                         h.usb_cdc_country_functional_desc;
1488
1489                 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1490                 if (!acm->country_codes)
1491                         goto skip_countries;
1492                 acm->country_code_size = cfd->bLength - 4;
1493                 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1494                                                         cfd->bLength - 4);
1495                 acm->country_rel_date = cfd->iCountryCodeRelDate;
1496
1497                 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1498                 if (i < 0) {
1499                         kfree(acm->country_codes);
1500                         acm->country_codes = NULL;
1501                         acm->country_code_size = 0;
1502                         goto skip_countries;
1503                 }
1504
1505                 i = device_create_file(&intf->dev,
1506                                                 &dev_attr_iCountryCodeRelDate);
1507                 if (i < 0) {
1508                         device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1509                         kfree(acm->country_codes);
1510                         acm->country_codes = NULL;
1511                         acm->country_code_size = 0;
1512                         goto skip_countries;
1513                 }
1514         }
1515
1516 skip_countries:
1517         usb_fill_int_urb(acm->ctrlurb, usb_dev,
1518                          usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1519                          acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1520                          /* works around buggy devices */
1521                          epctrl->bInterval ? epctrl->bInterval : 16);
1522         acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1523         acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1524         acm->notification_buffer = NULL;
1525         acm->nb_index = 0;
1526         acm->nb_size = 0;
1527
1528         dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1529
1530         acm->line.dwDTERate = cpu_to_le32(9600);
1531         acm->line.bDataBits = 8;
1532         acm_set_line(acm, &acm->line);
1533
1534         usb_driver_claim_interface(&acm_driver, data_interface, acm);
1535         usb_set_intfdata(data_interface, acm);
1536
1537         usb_get_intf(control_interface);
1538         tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1539                         &control_interface->dev);
1540         if (IS_ERR(tty_dev)) {
1541                 rv = PTR_ERR(tty_dev);
1542                 goto alloc_fail8;
1543         }
1544
1545         if (quirks & CLEAR_HALT_CONDITIONS) {
1546                 usb_clear_halt(usb_dev, acm->in);
1547                 usb_clear_halt(usb_dev, acm->out);
1548         }
1549
1550         return 0;
1551 alloc_fail8:
1552         if (acm->country_codes) {
1553                 device_remove_file(&acm->control->dev,
1554                                 &dev_attr_wCountryCodes);
1555                 device_remove_file(&acm->control->dev,
1556                                 &dev_attr_iCountryCodeRelDate);
1557                 kfree(acm->country_codes);
1558         }
1559         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1560 alloc_fail7:
1561         usb_set_intfdata(intf, NULL);
1562         for (i = 0; i < ACM_NW; i++)
1563                 usb_free_urb(acm->wb[i].urb);
1564 alloc_fail6:
1565         for (i = 0; i < num_rx_buf; i++)
1566                 usb_free_urb(acm->read_urbs[i]);
1567         acm_read_buffers_free(acm);
1568         usb_free_urb(acm->ctrlurb);
1569 alloc_fail5:
1570         acm_write_buffers_free(acm);
1571 alloc_fail4:
1572         usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1573 alloc_fail2:
1574         acm_release_minor(acm);
1575 alloc_fail1:
1576         kfree(acm);
1577 alloc_fail:
1578         return rv;
1579 }
1580
1581 static void acm_disconnect(struct usb_interface *intf)
1582 {
1583         struct acm *acm = usb_get_intfdata(intf);
1584         struct tty_struct *tty;
1585
1586         /* sibling interface is already cleaning up */
1587         if (!acm)
1588                 return;
1589
1590         mutex_lock(&acm->mutex);
1591         acm->disconnected = true;
1592         if (acm->country_codes) {
1593                 device_remove_file(&acm->control->dev,
1594                                 &dev_attr_wCountryCodes);
1595                 device_remove_file(&acm->control->dev,
1596                                 &dev_attr_iCountryCodeRelDate);
1597         }
1598         wake_up_all(&acm->wioctl);
1599         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1600         usb_set_intfdata(acm->control, NULL);
1601         usb_set_intfdata(acm->data, NULL);
1602         mutex_unlock(&acm->mutex);
1603
1604         tty = tty_port_tty_get(&acm->port);
1605         if (tty) {
1606                 tty_vhangup(tty);
1607                 tty_kref_put(tty);
1608         }
1609
1610         acm_kill_urbs(acm);
1611         cancel_work_sync(&acm->work);
1612
1613         tty_unregister_device(acm_tty_driver, acm->minor);
1614
1615         acm_write_buffers_free(acm);
1616         usb_free_coherent(acm->dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1617         acm_read_buffers_free(acm);
1618
1619         kfree(acm->notification_buffer);
1620
1621         if (!acm->combined_interfaces)
1622                 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1623                                         acm->data : acm->control);
1624
1625         tty_port_put(&acm->port);
1626 }
1627
1628 #ifdef CONFIG_PM
1629 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1630 {
1631         struct acm *acm = usb_get_intfdata(intf);
1632         int cnt;
1633
1634         spin_lock_irq(&acm->write_lock);
1635         if (PMSG_IS_AUTO(message)) {
1636                 if (acm->transmitting) {
1637                         spin_unlock_irq(&acm->write_lock);
1638                         return -EBUSY;
1639                 }
1640         }
1641         cnt = acm->susp_count++;
1642         spin_unlock_irq(&acm->write_lock);
1643
1644         if (cnt)
1645                 return 0;
1646
1647         acm_kill_urbs(acm);
1648         cancel_work_sync(&acm->work);
1649
1650         return 0;
1651 }
1652
1653 static int acm_resume(struct usb_interface *intf)
1654 {
1655         struct acm *acm = usb_get_intfdata(intf);
1656         struct urb *urb;
1657         int rv = 0;
1658
1659         spin_lock_irq(&acm->write_lock);
1660
1661         if (--acm->susp_count)
1662                 goto out;
1663
1664         if (tty_port_initialized(&acm->port)) {
1665                 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1666
1667                 for (;;) {
1668                         urb = usb_get_from_anchor(&acm->delayed);
1669                         if (!urb)
1670                                 break;
1671
1672                         acm_start_wb(acm, urb->context);
1673                 }
1674
1675                 /*
1676                  * delayed error checking because we must
1677                  * do the write path at all cost
1678                  */
1679                 if (rv < 0)
1680                         goto out;
1681
1682                 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1683         }
1684 out:
1685         spin_unlock_irq(&acm->write_lock);
1686
1687         return rv;
1688 }
1689
1690 static int acm_reset_resume(struct usb_interface *intf)
1691 {
1692         struct acm *acm = usb_get_intfdata(intf);
1693
1694         if (tty_port_initialized(&acm->port))
1695                 tty_port_tty_hangup(&acm->port, false);
1696
1697         return acm_resume(intf);
1698 }
1699
1700 #endif /* CONFIG_PM */
1701
1702 static int acm_pre_reset(struct usb_interface *intf)
1703 {
1704         struct acm *acm = usb_get_intfdata(intf);
1705
1706         clear_bit(EVENT_RX_STALL, &acm->flags);
1707
1708         return 0;
1709 }
1710
1711 #define NOKIA_PCSUITE_ACM_INFO(x) \
1712                 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1713                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1714                 USB_CDC_ACM_PROTO_VENDOR)
1715
1716 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1717                 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1718                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1719                 USB_CDC_ACM_PROTO_VENDOR)
1720
1721 /*
1722  * USB driver structure.
1723  */
1724
1725 static const struct usb_device_id acm_ids[] = {
1726         /* quirky and broken devices */
1727         { USB_DEVICE(0x076d, 0x0006), /* Denso Cradle CU-321 */
1728         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1729         { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1730         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1731         { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1732         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1733         },
1734         { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1735         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1736         },
1737         { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1738         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1739         },
1740         { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1741         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1742         },
1743         { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1744         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1745         },
1746         { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1747         .driver_info = SINGLE_RX_URB,
1748         },
1749         { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1750         .driver_info = SINGLE_RX_URB, /* firmware bug */
1751         },
1752         { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1753         .driver_info = SINGLE_RX_URB, /* firmware bug */
1754         },
1755         { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1756         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1757         },
1758         { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1759         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1760         },
1761         { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1762         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1763         },
1764         { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1765         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1766         },
1767         { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1768         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1769         },
1770         { USB_DEVICE(0x20df, 0x0001), /* Simtec Electronics Entropy Key */
1771         .driver_info = QUIRK_CONTROL_LINE_STATE, },
1772         { USB_DEVICE(0x2184, 0x001c) }, /* GW Instek AFG-2225 */
1773         { USB_DEVICE(0x2184, 0x0036) }, /* GW Instek AFG-125 */
1774         { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1775         },
1776         /* Motorola H24 HSPA module: */
1777         { USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1778         { USB_DEVICE(0x22b8, 0x2d92),   /* modem           + diagnostics        */
1779         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1780         },
1781         { USB_DEVICE(0x22b8, 0x2d93),   /* modem + AT port                      */
1782         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1783         },
1784         { USB_DEVICE(0x22b8, 0x2d95),   /* modem + AT port + diagnostics        */
1785         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1786         },
1787         { USB_DEVICE(0x22b8, 0x2d96),   /* modem                         + NMEA */
1788         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1789         },
1790         { USB_DEVICE(0x22b8, 0x2d97),   /* modem           + diagnostics + NMEA */
1791         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1792         },
1793         { USB_DEVICE(0x22b8, 0x2d99),   /* modem + AT port               + NMEA */
1794         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1795         },
1796         { USB_DEVICE(0x22b8, 0x2d9a),   /* modem + AT port + diagnostics + NMEA */
1797         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1798         },
1799
1800         { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1801         .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1802                                            data interface instead of
1803                                            communications interface.
1804                                            Maybe we should define a new
1805                                            quirk for this. */
1806         },
1807         { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1808         .driver_info = NO_UNION_NORMAL,
1809         },
1810         { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1811         .driver_info = NO_UNION_NORMAL,
1812         },
1813         { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1814         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1815         },
1816         { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1817         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1818         },
1819         { USB_DEVICE(0xfff0, 0x0100), /* DATECS FP-2000 */
1820         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1821         },
1822         { USB_DEVICE(0x09d8, 0x0320), /* Elatec GmbH TWN3 */
1823         .driver_info = NO_UNION_NORMAL, /* has misplaced union descriptor */
1824         },
1825
1826         { USB_DEVICE(0x2912, 0x0001), /* ATOL FPrint */
1827         .driver_info = CLEAR_HALT_CONDITIONS,
1828         },
1829
1830         /* Nokia S60 phones expose two ACM channels. The first is
1831          * a modem and is picked up by the standard AT-command
1832          * information below. The second is 'vendor-specific' but
1833          * is treated as a serial device at the S60 end, so we want
1834          * to expose it on Linux too. */
1835         { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1836         { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1837         { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1838         { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1839         { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1840         { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1841         { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1842         { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1843         { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1844         { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1845         { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1846         { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1847         { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1848         { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1849         { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1850         { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1851         { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1852         { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1853         { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1854         { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1855         { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1856         { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1857         { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1858         { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1859         { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1860         { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1861         { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1862         { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1863         { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1864         { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1865         { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1866         { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
1867         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1868         { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1869         { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1870         { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1871         { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1872         { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1873         { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1874         { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1875         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1876         { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1877         { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1878         { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1879         { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1880         { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1881         { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1882         { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1883         { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1884         { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1885         { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1886         { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1887         { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1888         { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1889         { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1890         { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1891         { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1892         { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1893
1894         /* Support for Owen devices */
1895         { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1896
1897         /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1898
1899         /* Support for Droids MuIn LCD */
1900         { USB_DEVICE(0x04d8, 0x000b),
1901         .driver_info = NO_DATA_INTERFACE,
1902         },
1903
1904 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1905         { USB_DEVICE(0x04d8, 0x0082),   /* Application mode */
1906         .driver_info = IGNORE_DEVICE,
1907         },
1908         { USB_DEVICE(0x04d8, 0x0083),   /* Bootloader mode */
1909         .driver_info = IGNORE_DEVICE,
1910         },
1911 #endif
1912
1913         /*Samsung phone in firmware update mode */
1914         { USB_DEVICE(0x04e8, 0x685d),
1915         .driver_info = IGNORE_DEVICE,
1916         },
1917
1918         /* Exclude Infineon Flash Loader utility */
1919         { USB_DEVICE(0x058b, 0x0041),
1920         .driver_info = IGNORE_DEVICE,
1921         },
1922
1923         /* control interfaces without any protocol set */
1924         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1925                 USB_CDC_PROTO_NONE) },
1926
1927         /* control interfaces with various AT-command sets */
1928         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1929                 USB_CDC_ACM_PROTO_AT_V25TER) },
1930         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1931                 USB_CDC_ACM_PROTO_AT_PCCA101) },
1932         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1933                 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1934         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1935                 USB_CDC_ACM_PROTO_AT_GSM) },
1936         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1937                 USB_CDC_ACM_PROTO_AT_3G) },
1938         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1939                 USB_CDC_ACM_PROTO_AT_CDMA) },
1940
1941         { USB_DEVICE(0x1519, 0x0452), /* Intel 7260 modem */
1942         .driver_info = SEND_ZERO_PACKET,
1943         },
1944
1945         { }
1946 };
1947
1948 MODULE_DEVICE_TABLE(usb, acm_ids);
1949
1950 static struct usb_driver acm_driver = {
1951         .name =         "cdc_acm",
1952         .probe =        acm_probe,
1953         .disconnect =   acm_disconnect,
1954 #ifdef CONFIG_PM
1955         .suspend =      acm_suspend,
1956         .resume =       acm_resume,
1957         .reset_resume = acm_reset_resume,
1958 #endif
1959         .pre_reset =    acm_pre_reset,
1960         .id_table =     acm_ids,
1961 #ifdef CONFIG_PM
1962         .supports_autosuspend = 1,
1963 #endif
1964         .disable_hub_initiated_lpm = 1,
1965 };
1966
1967 /*
1968  * TTY driver structures.
1969  */
1970
1971 static const struct tty_operations acm_ops = {
1972         .install =              acm_tty_install,
1973         .open =                 acm_tty_open,
1974         .close =                acm_tty_close,
1975         .cleanup =              acm_tty_cleanup,
1976         .hangup =               acm_tty_hangup,
1977         .write =                acm_tty_write,
1978         .put_char =             acm_tty_put_char,
1979         .flush_chars =          acm_tty_flush_chars,
1980         .write_room =           acm_tty_write_room,
1981         .ioctl =                acm_tty_ioctl,
1982         .throttle =             acm_tty_throttle,
1983         .unthrottle =           acm_tty_unthrottle,
1984         .chars_in_buffer =      acm_tty_chars_in_buffer,
1985         .break_ctl =            acm_tty_break_ctl,
1986         .set_termios =          acm_tty_set_termios,
1987         .tiocmget =             acm_tty_tiocmget,
1988         .tiocmset =             acm_tty_tiocmset,
1989         .get_icount =           acm_tty_get_icount,
1990 };
1991
1992 /*
1993  * Init / exit.
1994  */
1995
1996 static int __init acm_init(void)
1997 {
1998         int retval;
1999         acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
2000         if (!acm_tty_driver)
2001                 return -ENOMEM;
2002         acm_tty_driver->driver_name = "acm",
2003         acm_tty_driver->name = "ttyACM",
2004         acm_tty_driver->major = ACM_TTY_MAJOR,
2005         acm_tty_driver->minor_start = 0,
2006         acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
2007         acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
2008         acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
2009         acm_tty_driver->init_termios = tty_std_termios;
2010         acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
2011                                                                 HUPCL | CLOCAL;
2012         tty_set_operations(acm_tty_driver, &acm_ops);
2013
2014         retval = tty_register_driver(acm_tty_driver);
2015         if (retval) {
2016                 put_tty_driver(acm_tty_driver);
2017                 return retval;
2018         }
2019
2020         retval = usb_register(&acm_driver);
2021         if (retval) {
2022                 tty_unregister_driver(acm_tty_driver);
2023                 put_tty_driver(acm_tty_driver);
2024                 return retval;
2025         }
2026
2027         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
2028
2029         return 0;
2030 }
2031
2032 static void __exit acm_exit(void)
2033 {
2034         usb_deregister(&acm_driver);
2035         tty_unregister_driver(acm_tty_driver);
2036         put_tty_driver(acm_tty_driver);
2037         idr_destroy(&acm_minors);
2038 }
2039
2040 module_init(acm_init);
2041 module_exit(acm_exit);
2042
2043 MODULE_AUTHOR(DRIVER_AUTHOR);
2044 MODULE_DESCRIPTION(DRIVER_DESC);
2045 MODULE_LICENSE("GPL");
2046 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);