drivers/usb/class/cdc-acm.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * cdc-acm.c
   4  *
   5  * Copyright (c) 1999 Armin Fuerst      <fuerst@in.tum.de>
   6  * Copyright (c) 1999 Pavel Machek      <pavel@ucw.cz>
   7  * Copyright (c) 1999 Johannes Erdfelt  <johannes@erdfelt.com>
   8  * Copyright (c) 2000 Vojtech Pavlik    <vojtech@suse.cz>
   9  * Copyright (c) 2004 Oliver Neukum     <oliver@neukum.name>
  10  * Copyright (c) 2005 David Kubicek     <dave@awk.cz>
  11  * Copyright (c) 2011 Johan Hovold      <jhovold@gmail.com>
  12  *
  13  * USB Abstract Control Model driver for USB modems and ISDN adapters
  14  *
  15  * Sponsored by SuSE
  16  */
  17
  18 #undef DEBUG
  19 #undef VERBOSE_DEBUG
  20
  21 #include <linux/kernel.h>
  22 #include <linux/sched/signal.h>
  23 #include <linux/errno.h>
  24 #include <linux/init.h>
  25 #include <linux/slab.h>
  26 #include <linux/log2.h>
  27 #include <linux/tty.h>
  28 #include <linux/serial.h>
  29 #include <linux/tty_driver.h>
  30 #include <linux/tty_flip.h>
  31 #include <linux/module.h>
  32 #include <linux/mutex.h>
  33 #include <linux/uaccess.h>
  34 #include <linux/usb.h>
  35 #include <linux/usb/cdc.h>
  36 #include <asm/byteorder.h>
  37 #include <asm/unaligned.h>
  38 #include <linux/idr.h>
  39 #include <linux/list.h>
  40
  41 #include "cdc-acm.h"
  42
  43
  44 #define DRIVER_AUTHOR "Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik, David Kubicek, Johan Hovold"
  45 #define DRIVER_DESC "USB Abstract Control Model driver for USB modems and ISDN adapters"
  46
  47 static struct usb_driver acm_driver;
  48 static struct tty_driver *acm_tty_driver;
  49
  50 static DEFINE_IDR(acm_minors);
  51 static DEFINE_MUTEX(acm_minors_lock);
  52
  53 static void acm_tty_set_termios(struct tty_struct *tty,
  54                                 struct ktermios *termios_old);
  55
  56 /*
  57  * acm_minors accessors
  58  */
  59
  60 /*
  61  * Look up an ACM structure by minor. If found and not disconnected, increment
  62  * its refcount and return it with its mutex held.
  63  */
  64 static struct acm *acm_get_by_minor(unsigned int minor)
  65 {
  66         struct acm *acm;
  67
  68         mutex_lock(&acm_minors_lock);
  69         acm = idr_find(&acm_minors, minor);
  70         if (acm) {
  71                 mutex_lock(&acm->mutex);
  72                 if (acm->disconnected) {
  73                         mutex_unlock(&acm->mutex);
  74                         acm = NULL;
  75                 } else {
  76                         tty_port_get(&acm->port);
  77                         mutex_unlock(&acm->mutex);
  78                 }
  79         }
  80         mutex_unlock(&acm_minors_lock);
  81         return acm;
  82 }
  83
  84 /*
  85  * Try to find an available minor number and if found, associate it with 'acm'.
  86  */
  87 static int acm_alloc_minor(struct acm *acm)
  88 {
  89         int minor;
  90
  91         mutex_lock(&acm_minors_lock);
  92         minor = idr_alloc(&acm_minors, acm, 0, ACM_TTY_MINORS, GFP_KERNEL);
  93         mutex_unlock(&acm_minors_lock);
  94
  95         return minor;
  96 }
  97
  98 /* Release the minor number associated with 'acm'.  */
  99 static void acm_release_minor(struct acm *acm)
 100 {
 101         mutex_lock(&acm_minors_lock);
 102         idr_remove(&acm_minors, acm->minor);
 103         mutex_unlock(&acm_minors_lock);
 104 }
 105
 106 /*
 107  * Functions for ACM control messages.
 108  */
 109
 110 static int acm_ctrl_msg(struct acm *acm, int request, int value,
 111                                                         void *buf, int len)
 112 {
 113         int retval;
 114
 115         retval = usb_autopm_get_interface(acm->control);
 116         if (retval)
 117                 return retval;
 118
 119         retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
 120                 request, USB_RT_ACM, value,
 121                 acm->control->altsetting[0].desc.bInterfaceNumber,
 122                 buf, len, 5000);
 123
 124         dev_dbg(&acm->control->dev,
 125                 "%s - rq 0x%02x, val %#x, len %#x, result %d\n",
 126                 __func__, request, value, len, retval);
 127
 128         usb_autopm_put_interface(acm->control);
 129
 130         return retval < 0 ? retval : 0;
 131 }
 132
 133 /* devices aren't required to support these requests.
 134  * the cdc acm descriptor tells whether they do...
 135  */
 136 static inline int acm_set_control(struct acm *acm, int control)
 137 {
 138         if (acm->quirks & QUIRK_CONTROL_LINE_STATE)
 139                 return -EOPNOTSUPP;
 140
 141         return acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE,
 142                         control, NULL, 0);
 143 }
 144
 145 #define acm_set_line(acm, line) \
 146         acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
 147 #define acm_send_break(acm, ms) \
 148         acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)
 149
 150 static void acm_kill_urbs(struct acm *acm)
 151 {
 152         int i;
 153
 154         usb_kill_urb(acm->ctrlurb);
 155         for (i = 0; i < ACM_NW; i++)
 156                 usb_kill_urb(acm->wb[i].urb);
 157         for (i = 0; i < acm->rx_buflimit; i++)
 158                 usb_kill_urb(acm->read_urbs[i]);
 159 }
 160
 161 /*
 162  * Write buffer management.
 163  * All of these assume proper locks taken by the caller.
 164  */
 165
 166 static int acm_wb_alloc(struct acm *acm)
 167 {
 168         int i, wbn;
 169         struct acm_wb *wb;
 170
 171         wbn = 0;
 172         i = 0;
 173         for (;;) {
 174                 wb = &acm->wb[wbn];
 175                 if (!wb->use) {
 176                         wb->use = 1;
 177                         wb->len = 0;
 178                         return wbn;
 179                 }
 180                 wbn = (wbn + 1) % ACM_NW;
 181                 if (++i >= ACM_NW)
 182                         return -1;
 183         }
 184 }
 185
 186 static int acm_wb_is_avail(struct acm *acm)
 187 {
 188         int i, n;
 189         unsigned long flags;
 190
 191         n = ACM_NW;
 192         spin_lock_irqsave(&acm->write_lock, flags);
 193         for (i = 0; i < ACM_NW; i++)
 194                 n -= acm->wb[i].use;
 195         spin_unlock_irqrestore(&acm->write_lock, flags);
 196         return n;
 197 }
 198
 199 /*
 200  * Finish write. Caller must hold acm->write_lock
 201  */
 202 static void acm_write_done(struct acm *acm, struct acm_wb *wb)
 203 {
 204         wb->use = 0;
 205         acm->transmitting--;
 206         usb_autopm_put_interface_async(acm->control);
 207 }
 208
 209 /*
 210  * Poke write.
 211  *
 212  * the caller is responsible for locking
 213  */
 214
 215 static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
 216 {
 217         int rc;
 218
 219         acm->transmitting++;
 220
 221         wb->urb->transfer_buffer = wb->buf;
 222         wb->urb->transfer_dma = wb->dmah;
 223         wb->urb->transfer_buffer_length = wb->len;
 224         wb->urb->dev = acm->dev;
 225
 226         rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
 227         if (rc < 0) {
 228                 dev_err(&acm->data->dev,
 229                         "%s - usb_submit_urb(write bulk) failed: %d\n",
 230                         __func__, rc);
 231                 acm_write_done(acm, wb);
 232         }
 233         return rc;
 234 }
 235
 236 /*
 237  * attributes exported through sysfs
 238  */
 239 static ssize_t bmCapabilities_show
 240 (struct device *dev, struct device_attribute *attr, char *buf)
 241 {
 242         struct usb_interface *intf = to_usb_interface(dev);
 243         struct acm *acm = usb_get_intfdata(intf);
 244
 245         return sprintf(buf, "%d", acm->ctrl_caps);
 246 }
 247 static DEVICE_ATTR_RO(bmCapabilities);
 248
 249 static ssize_t wCountryCodes_show
 250 (struct device *dev, struct device_attribute *attr, char *buf)
 251 {
 252         struct usb_interface *intf = to_usb_interface(dev);
 253         struct acm *acm = usb_get_intfdata(intf);
 254
 255         memcpy(buf, acm->country_codes, acm->country_code_size);
 256         return acm->country_code_size;
 257 }
 258
 259 static DEVICE_ATTR_RO(wCountryCodes);
 260
 261 static ssize_t iCountryCodeRelDate_show
 262 (struct device *dev, struct device_attribute *attr, char *buf)
 263 {
 264         struct usb_interface *intf = to_usb_interface(dev);
 265         struct acm *acm = usb_get_intfdata(intf);
 266
 267         return sprintf(buf, "%d", acm->country_rel_date);
 268 }
 269
 270 static DEVICE_ATTR_RO(iCountryCodeRelDate);
 271 /*
 272  * Interrupt handlers for various ACM device responses
 273  */
 274
 275 static void acm_process_notification(struct acm *acm, unsigned char *buf)
 276 {
 277         int newctrl;
 278         int difference;
 279         unsigned long flags;
 280         struct usb_cdc_notification *dr = (struct usb_cdc_notification *)buf;
 281         unsigned char *data = buf + sizeof(struct usb_cdc_notification);
 282
 283         switch (dr->bNotificationType) {
 284         case USB_CDC_NOTIFY_NETWORK_CONNECTION:
 285                 dev_dbg(&acm->control->dev,
 286                         "%s - network connection: %d\n", __func__, dr->wValue);
 287                 break;
 288
 289         case USB_CDC_NOTIFY_SERIAL_STATE:
 290                 if (le16_to_cpu(dr->wLength) != 2) {
 291                         dev_dbg(&acm->control->dev,
 292                                 "%s - malformed serial state\n", __func__);
 293                         break;
 294                 }
 295
 296                 newctrl = get_unaligned_le16(data);
 297                 dev_dbg(&acm->control->dev,
 298                         "%s - serial state: 0x%x\n", __func__, newctrl);
 299
 300                 if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
 301                         dev_dbg(&acm->control->dev,
 302                                 "%s - calling hangup\n", __func__);
 303                         tty_port_tty_hangup(&acm->port, false);
 304                 }
 305
 306                 difference = acm->ctrlin ^ newctrl;
 307                 spin_lock_irqsave(&acm->read_lock, flags);
 308                 acm->ctrlin = newctrl;
 309                 acm->oldcount = acm->iocount;
 310
 311                 if (difference & ACM_CTRL_DSR)
 312                         acm->iocount.dsr++;
 313                 if (difference & ACM_CTRL_DCD)
 314                         acm->iocount.dcd++;
 315                 if (newctrl & ACM_CTRL_BRK)
 316                         acm->iocount.brk++;
 317                 if (newctrl & ACM_CTRL_RI)
 318                         acm->iocount.rng++;
 319                 if (newctrl & ACM_CTRL_FRAMING)
 320                         acm->iocount.frame++;
 321                 if (newctrl & ACM_CTRL_PARITY)
 322                         acm->iocount.parity++;
 323                 if (newctrl & ACM_CTRL_OVERRUN)
 324                         acm->iocount.overrun++;
 325                 spin_unlock_irqrestore(&acm->read_lock, flags);
 326
 327                 if (difference)
 328                         wake_up_all(&acm->wioctl);
 329
 330                 break;
 331
 332         default:
 333                 dev_dbg(&acm->control->dev,
 334                         "%s - unknown notification %d received: index %d len %d\n",
 335                         __func__,
 336                         dr->bNotificationType, dr->wIndex, dr->wLength);
 337         }
 338 }
 339
 340 /* control interface reports status changes with "interrupt" transfers */
 341 static void acm_ctrl_irq(struct urb *urb)
 342 {
 343         struct acm *acm = urb->context;
 344         struct usb_cdc_notification *dr = urb->transfer_buffer;
 345         unsigned int current_size = urb->actual_length;
 346         unsigned int expected_size, copy_size, alloc_size;
 347         int retval;
 348         int status = urb->status;
 349
 350         switch (status) {
 351         case 0:
 352                 /* success */
 353                 break;
 354         case -ECONNRESET:
 355         case -ENOENT:
 356         case -ESHUTDOWN:
 357                 /* this urb is terminated, clean up */
 358                 dev_dbg(&acm->control->dev,
 359                         "%s - urb shutting down with status: %d\n",
 360                         __func__, status);
 361                 return;
 362         default:
 363                 dev_dbg(&acm->control->dev,
 364                         "%s - nonzero urb status received: %d\n",
 365                         __func__, status);
 366                 goto exit;
 367         }
 368
 369         usb_mark_last_busy(acm->dev);
 370
 371         if (acm->nb_index)
 372                 dr = (struct usb_cdc_notification *)acm->notification_buffer;
 373
 374         /* size = notification-header + (optional) data */
 375         expected_size = sizeof(struct usb_cdc_notification) +
 376                                         le16_to_cpu(dr->wLength);
 377
 378         if (current_size < expected_size) {
 379                 /* notification is transmitted fragmented, reassemble */
 380                 if (acm->nb_size < expected_size) {
 381                         if (acm->nb_size) {
 382                                 kfree(acm->notification_buffer);
 383                                 acm->nb_size = 0;
 384                         }
 385                         alloc_size = roundup_pow_of_two(expected_size);
 386                         /*
 387                          * kmalloc ensures a valid notification_buffer after a
 388                          * use of kfree in case the previous allocation was too
 389                          * small. Final freeing is done on disconnect.
 390                          */
 391                         acm->notification_buffer =
 392                                 kmalloc(alloc_size, GFP_ATOMIC);
 393                         if (!acm->notification_buffer)
 394                                 goto exit;
 395                         acm->nb_size = alloc_size;
 396                 }
 397
 398                 copy_size = min(current_size,
 399                                 expected_size - acm->nb_index);
 400
 401                 memcpy(&acm->notification_buffer[acm->nb_index],
 402                        urb->transfer_buffer, copy_size);
 403                 acm->nb_index += copy_size;
 404                 current_size = acm->nb_index;
 405         }
 406
 407         if (current_size >= expected_size) {
 408                 /* notification complete */
 409                 acm_process_notification(acm, (unsigned char *)dr);
 410                 acm->nb_index = 0;
 411         }
 412
 413 exit:
 414         retval = usb_submit_urb(urb, GFP_ATOMIC);
 415         if (retval && retval != -EPERM)
 416                 dev_err(&acm->control->dev,
 417                         "%s - usb_submit_urb failed: %d\n", __func__, retval);
 418 }
 419
 420 static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
 421 {
 422         int res;
 423
 424         if (!test_and_clear_bit(index, &acm->read_urbs_free))
 425                 return 0;
 426
 427         res = usb_submit_urb(acm->read_urbs[index], mem_flags);
 428         if (res) {
 429                 if (res != -EPERM && res != -ENODEV) {
 430                         dev_err(&acm->data->dev,
 431                                 "urb %d failed submission with %d\n",
 432                                 index, res);
 433                 }
 434                 set_bit(index, &acm->read_urbs_free);
 435                 return res;
 436         } else {
 437                 dev_vdbg(&acm->data->dev, "submitted urb %d\n", index);
 438         }
 439
 440         return 0;
 441 }
 442
 443 static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
 444 {
 445         int res;
 446         int i;
 447
 448         for (i = 0; i < acm->rx_buflimit; ++i) {
 449                 res = acm_submit_read_urb(acm, i, mem_flags);
 450                 if (res)
 451                         return res;
 452         }
 453
 454         return 0;
 455 }
 456
 457 static void acm_process_read_urb(struct acm *acm, struct urb *urb)
 458 {
 459         if (!urb->actual_length)
 460                 return;
 461
 462         tty_insert_flip_string(&acm->port, urb->transfer_buffer,
 463                         urb->actual_length);
 464         tty_flip_buffer_push(&acm->port);
 465 }
 466
 467 static void acm_read_bulk_callback(struct urb *urb)
 468 {
 469         struct acm_rb *rb = urb->context;
 470         struct acm *acm = rb->instance;
 471         int status = urb->status;
 472         bool stopped = false;
 473         bool stalled = false;
 474
 475         dev_vdbg(&acm->data->dev, "got urb %d, len %d, status %d\n",
 476                 rb->index, urb->actual_length, status);
 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                 stalled = true;
 491                 break;
 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                 stopped = true;
 499                 break;
 500         default:
 501                 dev_dbg(&acm->data->dev,
 502                         "%s - nonzero urb status received: %d\n",
 503                         __func__, status);
 504                 break;
 505         }
 506
 507         /*
 508          * Make sure URB processing is done before marking as free to avoid
 509          * racing with unthrottle() on another CPU. Matches the barriers
 510          * implied by the test_and_clear_bit() in acm_submit_read_urb().
 511          */
 512         smp_mb__before_atomic();
 513         set_bit(rb->index, &acm->read_urbs_free);
 514         /*
 515          * Make sure URB is marked as free before checking the throttled flag
 516          * to avoid racing with unthrottle() on another CPU. Matches the
 517          * smp_mb() in unthrottle().
 518          */
 519         smp_mb__after_atomic();
 520
 521         if (stopped || stalled) {
 522                 if (stalled)
 523                         schedule_work(&acm->work);
 524                 return;
 525         }
 526
 527         if (test_bit(ACM_THROTTLED, &acm->flags))
 528                 return;
 529
 530         acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
 531 }
 532
 533 /* data interface wrote those outgoing bytes */
 534 static void acm_write_bulk(struct urb *urb)
 535 {
 536         struct acm_wb *wb = urb->context;
 537         struct acm *acm = wb->instance;
 538         unsigned long flags;
 539         int status = urb->status;
 540
 541         if (status || (urb->actual_length != urb->transfer_buffer_length))
 542                 dev_vdbg(&acm->data->dev, "wrote len %d/%d, status %d\n",
 543                         urb->actual_length,
 544                         urb->transfer_buffer_length,
 545                         status);
 546
 547         spin_lock_irqsave(&acm->write_lock, flags);
 548         acm_write_done(acm, wb);
 549         spin_unlock_irqrestore(&acm->write_lock, flags);
 550         set_bit(EVENT_TTY_WAKEUP, &acm->flags);
 551         schedule_work(&acm->work);
 552 }
 553
 554 static void acm_softint(struct work_struct *work)
 555 {
 556         int i;
 557         struct acm *acm = container_of(work, struct acm, work);
 558
 559         if (test_bit(EVENT_RX_STALL, &acm->flags)) {
 560                 if (!(usb_autopm_get_interface(acm->data))) {
 561                         for (i = 0; i < acm->rx_buflimit; i++)
 562                                 usb_kill_urb(acm->read_urbs[i]);
 563                         usb_clear_halt(acm->dev, acm->in);
 564                         acm_submit_read_urbs(acm, GFP_KERNEL);
 565                         usb_autopm_put_interface(acm->data);
 566                 }
 567                 clear_bit(EVENT_RX_STALL, &acm->flags);
 568         }
 569
 570         if (test_and_clear_bit(EVENT_TTY_WAKEUP, &acm->flags))
 571                 tty_port_tty_wakeup(&acm->port);
 572 }
 573
 574 /*
 575  * TTY handlers
 576  */
 577
 578 static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
 579 {
 580         struct acm *acm;
 581         int retval;
 582
 583         acm = acm_get_by_minor(tty->index);
 584         if (!acm)
 585                 return -ENODEV;
 586
 587         retval = tty_standard_install(driver, tty);
 588         if (retval)
 589                 goto error_init_termios;
 590
 591         /*
 592          * Suppress initial echoing for some devices which might send data
 593          * immediately after acm driver has been installed.
 594          */
 595         if (acm->quirks & DISABLE_ECHO)
 596                 tty->termios.c_lflag &= ~ECHO;
 597
 598         tty->driver_data = acm;
 599
 600         return 0;
 601
 602 error_init_termios:
 603         tty_port_put(&acm->port);
 604         return retval;
 605 }
 606
 607 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
 608 {
 609         struct acm *acm = tty->driver_data;
 610
 611         return tty_port_open(&acm->port, tty, filp);
 612 }
 613
 614 static void acm_port_dtr_rts(struct tty_port *port, int raise)
 615 {
 616         struct acm *acm = container_of(port, struct acm, port);
 617         int val;
 618         int res;
 619
 620         if (raise)
 621                 val = ACM_CTRL_DTR | ACM_CTRL_RTS;
 622         else
 623                 val = 0;
 624
 625         /* FIXME: add missing ctrlout locking throughout driver */
 626         acm->ctrlout = val;
 627
 628         res = acm_set_control(acm, val);
 629         if (res && (acm->ctrl_caps & USB_CDC_CAP_LINE))
 630                 dev_err(&acm->control->dev, "failed to set dtr/rts\n");
 631 }
 632
 633 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
 634 {
 635         struct acm *acm = container_of(port, struct acm, port);
 636         int retval = -ENODEV;
 637         int i;
 638
 639         mutex_lock(&acm->mutex);
 640         if (acm->disconnected)
 641                 goto disconnected;
 642
 643         retval = usb_autopm_get_interface(acm->control);
 644         if (retval)
 645                 goto error_get_interface;
 646
 647         /*
 648          * FIXME: Why do we need this? Allocating 64K of physically contiguous
 649          * memory is really nasty...
 650          */
 651         set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
 652         acm->control->needs_remote_wakeup = 1;
 653
 654         acm->ctrlurb->dev = acm->dev;
 655         retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
 656         if (retval) {
 657                 dev_err(&acm->control->dev,
 658                         "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
 659                 goto error_submit_urb;
 660         }
 661
 662         acm_tty_set_termios(tty, NULL);
 663
 664         /*
 665          * Unthrottle device in case the TTY was closed while throttled.
 666          */
 667         clear_bit(ACM_THROTTLED, &acm->flags);
 668
 669         retval = acm_submit_read_urbs(acm, GFP_KERNEL);
 670         if (retval)
 671                 goto error_submit_read_urbs;
 672
 673         usb_autopm_put_interface(acm->control);
 674
 675         mutex_unlock(&acm->mutex);
 676
 677         return 0;
 678
 679 error_submit_read_urbs:
 680         for (i = 0; i < acm->rx_buflimit; i++)
 681                 usb_kill_urb(acm->read_urbs[i]);
 682         usb_kill_urb(acm->ctrlurb);
 683 error_submit_urb:
 684         usb_autopm_put_interface(acm->control);
 685 error_get_interface:
 686 disconnected:
 687         mutex_unlock(&acm->mutex);
 688
 689         return usb_translate_errors(retval);
 690 }
 691
 692 static void acm_port_destruct(struct tty_port *port)
 693 {
 694         struct acm *acm = container_of(port, struct acm, port);
 695
 696         acm_release_minor(acm);
 697         usb_put_intf(acm->control);
 698         kfree(acm->country_codes);
 699         kfree(acm);
 700 }
 701
 702 static void acm_port_shutdown(struct tty_port *port)
 703 {
 704         struct acm *acm = container_of(port, struct acm, port);
 705         struct urb *urb;
 706         struct acm_wb *wb;
 707
 708         /*
 709          * Need to grab write_lock to prevent race with resume, but no need to
 710          * hold it due to the tty-port initialised flag.
 711          */
 712         spin_lock_irq(&acm->write_lock);
 713         spin_unlock_irq(&acm->write_lock);
 714
 715         usb_autopm_get_interface_no_resume(acm->control);
 716         acm->control->needs_remote_wakeup = 0;
 717         usb_autopm_put_interface(acm->control);
 718
 719         for (;;) {
 720                 urb = usb_get_from_anchor(&acm->delayed);
 721                 if (!urb)
 722                         break;
 723                 wb = urb->context;
 724                 wb->use = 0;
 725                 usb_autopm_put_interface_async(acm->control);
 726         }
 727
 728         acm_kill_urbs(acm);
 729 }
 730
 731 static void acm_tty_cleanup(struct tty_struct *tty)
 732 {
 733         struct acm *acm = tty->driver_data;
 734
 735         tty_port_put(&acm->port);
 736 }
 737
 738 static void acm_tty_hangup(struct tty_struct *tty)
 739 {
 740         struct acm *acm = tty->driver_data;
 741
 742         tty_port_hangup(&acm->port);
 743 }
 744
 745 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
 746 {
 747         struct acm *acm = tty->driver_data;
 748
 749         tty_port_close(&acm->port, tty, filp);
 750 }
 751
 752 static int acm_tty_write(struct tty_struct *tty,
 753                                         const unsigned char *buf, int count)
 754 {
 755         struct acm *acm = tty->driver_data;
 756         int stat;
 757         unsigned long flags;
 758         int wbn;
 759         struct acm_wb *wb;
 760
 761         if (!count)
 762                 return 0;
 763
 764         dev_vdbg(&acm->data->dev, "%d bytes from tty layer\n", count);
 765
 766         spin_lock_irqsave(&acm->write_lock, flags);
 767         wbn = acm_wb_alloc(acm);
 768         if (wbn < 0) {
 769                 spin_unlock_irqrestore(&acm->write_lock, flags);
 770                 return 0;
 771         }
 772         wb = &acm->wb[wbn];
 773
 774         if (!acm->dev) {
 775                 wb->use = 0;
 776                 spin_unlock_irqrestore(&acm->write_lock, flags);
 777                 return -ENODEV;
 778         }
 779
 780         count = (count > acm->writesize) ? acm->writesize : count;
 781         dev_vdbg(&acm->data->dev, "writing %d bytes\n", count);
 782         memcpy(wb->buf, buf, count);
 783         wb->len = count;
 784
 785         stat = usb_autopm_get_interface_async(acm->control);
 786         if (stat) {
 787                 wb->use = 0;
 788                 spin_unlock_irqrestore(&acm->write_lock, flags);
 789                 return stat;
 790         }
 791
 792         if (acm->susp_count) {
 793                 usb_anchor_urb(wb->urb, &acm->delayed);
 794                 spin_unlock_irqrestore(&acm->write_lock, flags);
 795                 return count;
 796         }
 797
 798         stat = acm_start_wb(acm, wb);
 799         spin_unlock_irqrestore(&acm->write_lock, flags);
 800
 801         if (stat < 0)
 802                 return stat;
 803         return count;
 804 }
 805
 806 static int acm_tty_write_room(struct tty_struct *tty)
 807 {
 808         struct acm *acm = tty->driver_data;
 809         /*
 810          * Do not let the line discipline to know that we have a reserve,
 811          * or it might get too enthusiastic.
 812          */
 813         return acm_wb_is_avail(acm) ? acm->writesize : 0;
 814 }
 815
 816 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
 817 {
 818         struct acm *acm = tty->driver_data;
 819         /*
 820          * if the device was unplugged then any remaining characters fell out
 821          * of the connector ;)
 822          */
 823         if (acm->disconnected)
 824                 return 0;
 825         /*
 826          * This is inaccurate (overcounts), but it works.
 827          */
 828         return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
 829 }
 830
 831 static void acm_tty_throttle(struct tty_struct *tty)
 832 {
 833         struct acm *acm = tty->driver_data;
 834
 835         set_bit(ACM_THROTTLED, &acm->flags);
 836 }
 837
 838 static void acm_tty_unthrottle(struct tty_struct *tty)
 839 {
 840         struct acm *acm = tty->driver_data;
 841
 842         clear_bit(ACM_THROTTLED, &acm->flags);
 843
 844         /* Matches the smp_mb__after_atomic() in acm_read_bulk_callback(). */
 845         smp_mb();
 846
 847         acm_submit_read_urbs(acm, GFP_KERNEL);
 848 }
 849
 850 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
 851 {
 852         struct acm *acm = tty->driver_data;
 853         int retval;
 854
 855         retval = acm_send_break(acm, state ? 0xffff : 0);
 856         if (retval < 0)
 857                 dev_dbg(&acm->control->dev,
 858                         "%s - send break failed\n", __func__);
 859         return retval;
 860 }
 861
 862 static int acm_tty_tiocmget(struct tty_struct *tty)
 863 {
 864         struct acm *acm = tty->driver_data;
 865
 866         return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
 867                (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
 868                (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
 869                (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
 870                (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
 871                TIOCM_CTS;
 872 }
 873
 874 static int acm_tty_tiocmset(struct tty_struct *tty,
 875                             unsigned int set, unsigned int clear)
 876 {
 877         struct acm *acm = tty->driver_data;
 878         unsigned int newctrl;
 879
 880         newctrl = acm->ctrlout;
 881         set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 882                                         (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 883         clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 884                                         (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 885
 886         newctrl = (newctrl & ~clear) | set;
 887
 888         if (acm->ctrlout == newctrl)
 889                 return 0;
 890         return acm_set_control(acm, acm->ctrlout = newctrl);
 891 }
 892
 893 static int get_serial_info(struct tty_struct *tty, struct serial_struct *ss)
 894 {
 895         struct acm *acm = tty->driver_data;
 896
 897         ss->xmit_fifo_size = acm->writesize;
 898         ss->baud_base = le32_to_cpu(acm->line.dwDTERate);
 899         ss->close_delay = acm->port.close_delay / 10;
 900         ss->closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 901                                 ASYNC_CLOSING_WAIT_NONE :
 902                                 acm->port.closing_wait / 10;
 903         return 0;
 904 }
 905
 906 static int set_serial_info(struct tty_struct *tty, struct serial_struct *ss)
 907 {
 908         struct acm *acm = tty->driver_data;
 909         unsigned int closing_wait, close_delay;
 910         int retval = 0;
 911
 912         close_delay = ss->close_delay * 10;
 913         closing_wait = ss->closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 914                         ASYNC_CLOSING_WAIT_NONE : ss->closing_wait * 10;
 915
 916         mutex_lock(&acm->port.mutex);
 917
 918         if (!capable(CAP_SYS_ADMIN)) {
 919                 if ((close_delay != acm->port.close_delay) ||
 920                     (closing_wait != acm->port.closing_wait))
 921                         retval = -EPERM;
 922                 else
 923                         retval = -EOPNOTSUPP;
 924         } else {
 925                 acm->port.close_delay  = close_delay;
 926                 acm->port.closing_wait = closing_wait;
 927         }
 928
 929         mutex_unlock(&acm->port.mutex);
 930         return retval;
 931 }
 932
 933 static int wait_serial_change(struct acm *acm, unsigned long arg)
 934 {
 935         int rv = 0;
 936         DECLARE_WAITQUEUE(wait, current);
 937         struct async_icount old, new;
 938
 939         do {
 940                 spin_lock_irq(&acm->read_lock);
 941                 old = acm->oldcount;
 942                 new = acm->iocount;
 943                 acm->oldcount = new;
 944                 spin_unlock_irq(&acm->read_lock);
 945
 946                 if ((arg & TIOCM_DSR) &&
 947                         old.dsr != new.dsr)
 948                         break;
 949                 if ((arg & TIOCM_CD)  &&
 950                         old.dcd != new.dcd)
 951                         break;
 952                 if ((arg & TIOCM_RI) &&
 953                         old.rng != new.rng)
 954                         break;
 955
 956                 add_wait_queue(&acm->wioctl, &wait);
 957                 set_current_state(TASK_INTERRUPTIBLE);
 958                 schedule();
 959                 remove_wait_queue(&acm->wioctl, &wait);
 960                 if (acm->disconnected) {
 961                         if (arg & TIOCM_CD)
 962                                 break;
 963                         else
 964                                 rv = -ENODEV;
 965                 } else {
 966                         if (signal_pending(current))
 967                                 rv = -ERESTARTSYS;
 968                 }
 969         } while (!rv);
 970
 971
 972
 973         return rv;
 974 }
 975
 976 static int acm_tty_get_icount(struct tty_struct *tty,
 977                                         struct serial_icounter_struct *icount)
 978 {
 979         struct acm *acm = tty->driver_data;
 980
 981         icount->dsr = acm->iocount.dsr;
 982         icount->rng = acm->iocount.rng;
 983         icount->dcd = acm->iocount.dcd;
 984         icount->frame = acm->iocount.frame;
 985         icount->overrun = acm->iocount.overrun;
 986         icount->parity = acm->iocount.parity;
 987         icount->brk = acm->iocount.brk;
 988
 989         return 0;
 990 }
 991
 992 static int acm_tty_ioctl(struct tty_struct *tty,
 993                                         unsigned int cmd, unsigned long arg)
 994 {
 995         struct acm *acm = tty->driver_data;
 996         int rv = -ENOIOCTLCMD;
 997
 998         switch (cmd) {
 999         case TIOCMIWAIT:
1000                 rv = usb_autopm_get_interface(acm->control);
1001                 if (rv < 0) {
1002                         rv = -EIO;
1003                         break;
1004                 }
1005                 rv = wait_serial_change(acm, arg);
1006                 usb_autopm_put_interface(acm->control);
1007                 break;
1008         }
1009
1010         return rv;
1011 }
1012
1013 static void acm_tty_set_termios(struct tty_struct *tty,
1014                                                 struct ktermios *termios_old)
1015 {
1016         struct acm *acm = tty->driver_data;
1017         struct ktermios *termios = &tty->termios;
1018         struct usb_cdc_line_coding newline;
1019         int newctrl = acm->ctrlout;
1020
1021         newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
1022         newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
1023         newline.bParityType = termios->c_cflag & PARENB ?
1024                                 (termios->c_cflag & PARODD ? 1 : 2) +
1025                                 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
1026         switch (termios->c_cflag & CSIZE) {
1027         case CS5:
1028                 newline.bDataBits = 5;
1029                 break;
1030         case CS6:
1031                 newline.bDataBits = 6;
1032                 break;
1033         case CS7:
1034                 newline.bDataBits = 7;
1035                 break;
1036         case CS8:
1037         default:
1038                 newline.bDataBits = 8;
1039                 break;
1040         }
1041         /* FIXME: Needs to clear unsupported bits in the termios */
1042         acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
1043
1044         if (C_BAUD(tty) == B0) {
1045                 newline.dwDTERate = acm->line.dwDTERate;
1046                 newctrl &= ~ACM_CTRL_DTR;
1047         } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
1048                 newctrl |=  ACM_CTRL_DTR;
1049         }
1050
1051         if (newctrl != acm->ctrlout)
1052                 acm_set_control(acm, acm->ctrlout = newctrl);
1053
1054         if (memcmp(&acm->line, &newline, sizeof newline)) {
1055                 memcpy(&acm->line, &newline, sizeof newline);
1056                 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
1057                         __func__,
1058                         le32_to_cpu(newline.dwDTERate),
1059                         newline.bCharFormat, newline.bParityType,
1060                         newline.bDataBits);
1061                 acm_set_line(acm, &acm->line);
1062         }
1063 }
1064
1065 static const struct tty_port_operations acm_port_ops = {
1066         .dtr_rts = acm_port_dtr_rts,
1067         .shutdown = acm_port_shutdown,
1068         .activate = acm_port_activate,
1069         .destruct = acm_port_destruct,
1070 };
1071
1072 /*
1073  * USB probe and disconnect routines.
1074  */
1075
1076 /* Little helpers: write/read buffers free */
1077 static void acm_write_buffers_free(struct acm *acm)
1078 {
1079         int i;
1080         struct acm_wb *wb;
1081
1082         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1083                 usb_free_coherent(acm->dev, acm->writesize, wb->buf, wb->dmah);
1084 }
1085
1086 static void acm_read_buffers_free(struct acm *acm)
1087 {
1088         int i;
1089
1090         for (i = 0; i < acm->rx_buflimit; i++)
1091                 usb_free_coherent(acm->dev, acm->readsize,
1092                           acm->read_buffers[i].base, acm->read_buffers[i].dma);
1093 }
1094
1095 /* Little helper: write buffers allocate */
1096 static int acm_write_buffers_alloc(struct acm *acm)
1097 {
1098         int i;
1099         struct acm_wb *wb;
1100
1101         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1102                 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1103                     &wb->dmah);
1104                 if (!wb->buf) {
1105                         while (i != 0) {
1106                                 --i;
1107                                 --wb;
1108                                 usb_free_coherent(acm->dev, acm->writesize,
1109                                     wb->buf, wb->dmah);
1110                         }
1111                         return -ENOMEM;
1112                 }
1113         }
1114         return 0;
1115 }
1116
1117 static int acm_probe(struct usb_interface *intf,
1118                      const struct usb_device_id *id)
1119 {
1120         struct usb_cdc_union_desc *union_header = NULL;
1121         struct usb_cdc_call_mgmt_descriptor *cmgmd = NULL;
1122         unsigned char *buffer = intf->altsetting->extra;
1123         int buflen = intf->altsetting->extralen;
1124         struct usb_interface *control_interface;
1125         struct usb_interface *data_interface;
1126         struct usb_endpoint_descriptor *epctrl = NULL;
1127         struct usb_endpoint_descriptor *epread = NULL;
1128         struct usb_endpoint_descriptor *epwrite = NULL;
1129         struct usb_device *usb_dev = interface_to_usbdev(intf);
1130         struct usb_cdc_parsed_header h;
1131         struct acm *acm;
1132         int minor;
1133         int ctrlsize, readsize;
1134         u8 *buf;
1135         int call_intf_num = -1;
1136         int data_intf_num = -1;
1137         unsigned long quirks;
1138         int num_rx_buf;
1139         int i;
1140         int combined_interfaces = 0;
1141         struct device *tty_dev;
1142         int rv = -ENOMEM;
1143         int res;
1144
1145         /* normal quirks */
1146         quirks = (unsigned long)id->driver_info;
1147
1148         if (quirks == IGNORE_DEVICE)
1149                 return -ENODEV;
1150
1151         memset(&h, 0x00, sizeof(struct usb_cdc_parsed_header));
1152
1153         num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1154
1155         /* handle quirks deadly to normal probing*/
1156         if (quirks == NO_UNION_NORMAL) {
1157                 data_interface = usb_ifnum_to_if(usb_dev, 1);
1158                 control_interface = usb_ifnum_to_if(usb_dev, 0);
1159                 /* we would crash */
1160                 if (!data_interface || !control_interface)
1161                         return -ENODEV;
1162                 goto skip_normal_probe;
1163         }
1164
1165         /* normal probing*/
1166         if (!buffer) {
1167                 dev_err(&intf->dev, "Weird descriptor references\n");
1168                 return -EINVAL;
1169         }
1170
1171         if (!intf->cur_altsetting)
1172                 return -EINVAL;
1173
1174         if (!buflen) {
1175                 if (intf->cur_altsetting->endpoint &&
1176                                 intf->cur_altsetting->endpoint->extralen &&
1177                                 intf->cur_altsetting->endpoint->extra) {
1178                         dev_dbg(&intf->dev,
1179                                 "Seeking extra descriptors on endpoint\n");
1180                         buflen = intf->cur_altsetting->endpoint->extralen;
1181                         buffer = intf->cur_altsetting->endpoint->extra;
1182                 } else {
1183                         dev_err(&intf->dev,
1184                                 "Zero length descriptor references\n");
1185                         return -EINVAL;
1186                 }
1187         }
1188
1189         cdc_parse_cdc_header(&h, intf, buffer, buflen);
1190         union_header = h.usb_cdc_union_desc;
1191         cmgmd = h.usb_cdc_call_mgmt_descriptor;
1192         if (cmgmd)
1193                 call_intf_num = cmgmd->bDataInterface;
1194
1195         if (!union_header) {
1196                 if (call_intf_num > 0) {
1197                         dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1198                         /* quirks for Droids MuIn LCD */
1199                         if (quirks & NO_DATA_INTERFACE) {
1200                                 data_interface = usb_ifnum_to_if(usb_dev, 0);
1201                         } else {
1202                                 data_intf_num = call_intf_num;
1203                                 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1204                         }
1205                         control_interface = intf;
1206                 } else {
1207                         if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1208                                 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1209                                 return -ENODEV;
1210                         } else {
1211                                 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1212                                 combined_interfaces = 1;
1213                                 control_interface = data_interface = intf;
1214                                 goto look_for_collapsed_interface;
1215                         }
1216                 }
1217         } else {
1218                 data_intf_num = union_header->bSlaveInterface0;
1219                 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1220                 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1221         }
1222
1223         if (!control_interface || !data_interface) {
1224                 dev_dbg(&intf->dev, "no interfaces\n");
1225                 return -ENODEV;
1226         }
1227         if (!data_interface->cur_altsetting || !control_interface->cur_altsetting)
1228                 return -ENODEV;
1229
1230         if (data_intf_num != call_intf_num)
1231                 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1232
1233         if (control_interface == data_interface) {
1234                 /* some broken devices designed for windows work this way */
1235                 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1236                 combined_interfaces = 1;
1237                 /* a popular other OS doesn't use it */
1238                 quirks |= NO_CAP_LINE;
1239                 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1240                         dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1241                         return -EINVAL;
1242                 }
1243 look_for_collapsed_interface:
1244                 res = usb_find_common_endpoints(data_interface->cur_altsetting,
1245                                 &epread, &epwrite, &epctrl, NULL);
1246                 if (res)
1247                         return res;
1248
1249                 goto made_compressed_probe;
1250         }
1251
1252 skip_normal_probe:
1253
1254         /*workaround for switched interfaces */
1255         if (data_interface->cur_altsetting->desc.bInterfaceClass
1256                                                 != CDC_DATA_INTERFACE_TYPE) {
1257                 if (control_interface->cur_altsetting->desc.bInterfaceClass
1258                                                 == CDC_DATA_INTERFACE_TYPE) {
1259                         dev_dbg(&intf->dev,
1260                                 "Your device has switched interfaces.\n");
1261                         swap(control_interface, data_interface);
1262                 } else {
1263                         return -EINVAL;
1264                 }
1265         }
1266
1267         /* Accept probe requests only for the control interface */
1268         if (!combined_interfaces && intf != control_interface)
1269                 return -ENODEV;
1270
1271         if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1272                 /* valid in this context */
1273                 dev_dbg(&intf->dev, "The data interface isn't available\n");
1274                 return -EBUSY;
1275         }
1276
1277
1278         if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1279             control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1280                 return -EINVAL;
1281
1282         epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1283         epread = &data_interface->cur_altsetting->endpoint[0].desc;
1284         epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1285
1286
1287         /* workaround for switched endpoints */
1288         if (!usb_endpoint_dir_in(epread)) {
1289                 /* descriptors are swapped */
1290                 dev_dbg(&intf->dev,
1291                         "The data interface has switched endpoints\n");
1292                 swap(epread, epwrite);
1293         }
1294 made_compressed_probe:
1295         dev_dbg(&intf->dev, "interfaces are valid\n");
1296
1297         acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1298         if (acm == NULL)
1299                 goto alloc_fail;
1300
1301         tty_port_init(&acm->port);
1302         acm->port.ops = &acm_port_ops;
1303
1304         ctrlsize = usb_endpoint_maxp(epctrl);
1305         readsize = usb_endpoint_maxp(epread) *
1306                                 (quirks == SINGLE_RX_URB ? 1 : 2);
1307         acm->combined_interfaces = combined_interfaces;
1308         acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1309         acm->control = control_interface;
1310         acm->data = data_interface;
1311
1312         usb_get_intf(acm->control); /* undone in destruct() */
1313
1314         minor = acm_alloc_minor(acm);
1315         if (minor < 0)
1316                 goto alloc_fail1;
1317
1318         acm->minor = minor;
1319         acm->dev = usb_dev;
1320         if (h.usb_cdc_acm_descriptor)
1321                 acm->ctrl_caps = h.usb_cdc_acm_descriptor->bmCapabilities;
1322         if (quirks & NO_CAP_LINE)
1323                 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1324         acm->ctrlsize = ctrlsize;
1325         acm->readsize = readsize;
1326         acm->rx_buflimit = num_rx_buf;
1327         INIT_WORK(&acm->work, acm_softint);
1328         init_waitqueue_head(&acm->wioctl);
1329         spin_lock_init(&acm->write_lock);
1330         spin_lock_init(&acm->read_lock);
1331         mutex_init(&acm->mutex);
1332         if (usb_endpoint_xfer_int(epread)) {
1333                 acm->bInterval = epread->bInterval;
1334                 acm->in = usb_rcvintpipe(usb_dev, epread->bEndpointAddress);
1335         } else {
1336                 acm->in = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1337         }
1338         if (usb_endpoint_xfer_int(epwrite))
1339                 acm->out = usb_sndintpipe(usb_dev, epwrite->bEndpointAddress);
1340         else
1341                 acm->out = usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress);
1342         init_usb_anchor(&acm->delayed);
1343         acm->quirks = quirks;
1344
1345         buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1346         if (!buf)
1347                 goto alloc_fail1;
1348         acm->ctrl_buffer = buf;
1349
1350         if (acm_write_buffers_alloc(acm) < 0)
1351                 goto alloc_fail2;
1352
1353         acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1354         if (!acm->ctrlurb)
1355                 goto alloc_fail3;
1356
1357         for (i = 0; i < num_rx_buf; i++) {
1358                 struct acm_rb *rb = &(acm->read_buffers[i]);
1359                 struct urb *urb;
1360
1361                 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1362                                                                 &rb->dma);
1363                 if (!rb->base)
1364                         goto alloc_fail4;
1365                 rb->index = i;
1366                 rb->instance = acm;
1367
1368                 urb = usb_alloc_urb(0, GFP_KERNEL);
1369                 if (!urb)
1370                         goto alloc_fail4;
1371
1372                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1373                 urb->transfer_dma = rb->dma;
1374                 if (usb_endpoint_xfer_int(epread))
1375                         usb_fill_int_urb(urb, acm->dev, acm->in, rb->base,
1376                                          acm->readsize,
1377                                          acm_read_bulk_callback, rb,
1378                                          acm->bInterval);
1379                 else
1380                         usb_fill_bulk_urb(urb, acm->dev, acm->in, rb->base,
1381                                           acm->readsize,
1382                                           acm_read_bulk_callback, rb);
1383
1384                 acm->read_urbs[i] = urb;
1385                 __set_bit(i, &acm->read_urbs_free);
1386         }
1387         for (i = 0; i < ACM_NW; i++) {
1388                 struct acm_wb *snd = &(acm->wb[i]);
1389
1390                 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1391                 if (snd->urb == NULL)
1392                         goto alloc_fail5;
1393
1394                 if (usb_endpoint_xfer_int(epwrite))
1395                         usb_fill_int_urb(snd->urb, usb_dev, acm->out,
1396                                 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1397                 else
1398                         usb_fill_bulk_urb(snd->urb, usb_dev, acm->out,
1399                                 NULL, acm->writesize, acm_write_bulk, snd);
1400                 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1401                 if (quirks & SEND_ZERO_PACKET)
1402                         snd->urb->transfer_flags |= URB_ZERO_PACKET;
1403                 snd->instance = acm;
1404         }
1405
1406         usb_set_intfdata(intf, acm);
1407
1408         i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1409         if (i < 0)
1410                 goto alloc_fail5;
1411
1412         if (h.usb_cdc_country_functional_desc) { /* export the country data */
1413                 struct usb_cdc_country_functional_desc * cfd =
1414                                         h.usb_cdc_country_functional_desc;
1415
1416                 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1417                 if (!acm->country_codes)
1418                         goto skip_countries;
1419                 acm->country_code_size = cfd->bLength - 4;
1420                 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1421                                                         cfd->bLength - 4);
1422                 acm->country_rel_date = cfd->iCountryCodeRelDate;
1423
1424                 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1425                 if (i < 0) {
1426                         kfree(acm->country_codes);
1427                         acm->country_codes = NULL;
1428                         acm->country_code_size = 0;
1429                         goto skip_countries;
1430                 }
1431
1432                 i = device_create_file(&intf->dev,
1433                                                 &dev_attr_iCountryCodeRelDate);
1434                 if (i < 0) {
1435                         device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1436                         kfree(acm->country_codes);
1437                         acm->country_codes = NULL;
1438                         acm->country_code_size = 0;
1439                         goto skip_countries;
1440                 }
1441         }
1442
1443 skip_countries:
1444         usb_fill_int_urb(acm->ctrlurb, usb_dev,
1445                          usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1446                          acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1447                          /* works around buggy devices */
1448                          epctrl->bInterval ? epctrl->bInterval : 16);
1449         acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1450         acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1451         acm->notification_buffer = NULL;
1452         acm->nb_index = 0;
1453         acm->nb_size = 0;
1454
1455         dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1456
1457         acm->line.dwDTERate = cpu_to_le32(9600);
1458         acm->line.bDataBits = 8;
1459         acm_set_line(acm, &acm->line);
1460
1461         usb_driver_claim_interface(&acm_driver, data_interface, acm);
1462         usb_set_intfdata(data_interface, acm);
1463
1464         tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1465                         &control_interface->dev);
1466         if (IS_ERR(tty_dev)) {
1467                 rv = PTR_ERR(tty_dev);
1468                 goto alloc_fail6;
1469         }
1470
1471         if (quirks & CLEAR_HALT_CONDITIONS) {
1472                 usb_clear_halt(usb_dev, acm->in);
1473                 usb_clear_halt(usb_dev, acm->out);
1474         }
1475
1476         return 0;
1477 alloc_fail6:
1478         if (acm->country_codes) {
1479                 device_remove_file(&acm->control->dev,
1480                                 &dev_attr_wCountryCodes);
1481                 device_remove_file(&acm->control->dev,
1482                                 &dev_attr_iCountryCodeRelDate);
1483                 kfree(acm->country_codes);
1484         }
1485         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1486 alloc_fail5:
1487         usb_set_intfdata(intf, NULL);
1488         for (i = 0; i < ACM_NW; i++)
1489                 usb_free_urb(acm->wb[i].urb);
1490 alloc_fail4:
1491         for (i = 0; i < num_rx_buf; i++)
1492                 usb_free_urb(acm->read_urbs[i]);
1493         acm_read_buffers_free(acm);
1494         usb_free_urb(acm->ctrlurb);
1495 alloc_fail3:
1496         acm_write_buffers_free(acm);
1497 alloc_fail2:
1498         usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1499 alloc_fail1:
1500         tty_port_put(&acm->port);
1501 alloc_fail:
1502         return rv;
1503 }
1504
1505 static void acm_disconnect(struct usb_interface *intf)
1506 {
1507         struct acm *acm = usb_get_intfdata(intf);
1508         struct tty_struct *tty;
1509         int i;
1510
1511         /* sibling interface is already cleaning up */
1512         if (!acm)
1513                 return;
1514
1515         mutex_lock(&acm->mutex);
1516         acm->disconnected = true;
1517         if (acm->country_codes) {
1518                 device_remove_file(&acm->control->dev,
1519                                 &dev_attr_wCountryCodes);
1520                 device_remove_file(&acm->control->dev,
1521                                 &dev_attr_iCountryCodeRelDate);
1522         }
1523         wake_up_all(&acm->wioctl);
1524         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1525         usb_set_intfdata(acm->control, NULL);
1526         usb_set_intfdata(acm->data, NULL);
1527         mutex_unlock(&acm->mutex);
1528
1529         tty = tty_port_tty_get(&acm->port);
1530         if (tty) {
1531                 tty_vhangup(tty);
1532                 tty_kref_put(tty);
1533         }
1534
1535         acm_kill_urbs(acm);
1536         cancel_work_sync(&acm->work);
1537
1538         tty_unregister_device(acm_tty_driver, acm->minor);
1539
1540         usb_free_urb(acm->ctrlurb);
1541         for (i = 0; i < ACM_NW; i++)
1542                 usb_free_urb(acm->wb[i].urb);
1543         for (i = 0; i < acm->rx_buflimit; i++)
1544                 usb_free_urb(acm->read_urbs[i]);
1545         acm_write_buffers_free(acm);
1546         usb_free_coherent(acm->dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1547         acm_read_buffers_free(acm);
1548
1549         kfree(acm->notification_buffer);
1550
1551         if (!acm->combined_interfaces)
1552                 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1553                                         acm->data : acm->control);
1554
1555         tty_port_put(&acm->port);
1556 }
1557
1558 #ifdef CONFIG_PM
1559 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1560 {
1561         struct acm *acm = usb_get_intfdata(intf);
1562         int cnt;
1563
1564         spin_lock_irq(&acm->write_lock);
1565         if (PMSG_IS_AUTO(message)) {
1566                 if (acm->transmitting) {
1567                         spin_unlock_irq(&acm->write_lock);
1568                         return -EBUSY;
1569                 }
1570         }
1571         cnt = acm->susp_count++;
1572         spin_unlock_irq(&acm->write_lock);
1573
1574         if (cnt)
1575                 return 0;
1576
1577         acm_kill_urbs(acm);
1578         cancel_work_sync(&acm->work);
1579
1580         return 0;
1581 }
1582
1583 static int acm_resume(struct usb_interface *intf)
1584 {
1585         struct acm *acm = usb_get_intfdata(intf);
1586         struct urb *urb;
1587         int rv = 0;
1588
1589         spin_lock_irq(&acm->write_lock);
1590
1591         if (--acm->susp_count)
1592                 goto out;
1593
1594         if (tty_port_initialized(&acm->port)) {
1595                 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1596
1597                 for (;;) {
1598                         urb = usb_get_from_anchor(&acm->delayed);
1599                         if (!urb)
1600                                 break;
1601
1602                         acm_start_wb(acm, urb->context);
1603                 }
1604
1605                 /*
1606                  * delayed error checking because we must
1607                  * do the write path at all cost
1608                  */
1609                 if (rv < 0)
1610                         goto out;
1611
1612                 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1613         }
1614 out:
1615         spin_unlock_irq(&acm->write_lock);
1616
1617         return rv;
1618 }
1619
1620 static int acm_reset_resume(struct usb_interface *intf)
1621 {
1622         struct acm *acm = usb_get_intfdata(intf);
1623
1624         if (tty_port_initialized(&acm->port))
1625                 tty_port_tty_hangup(&acm->port, false);
1626
1627         return acm_resume(intf);
1628 }
1629
1630 #endif /* CONFIG_PM */
1631
1632 static int acm_pre_reset(struct usb_interface *intf)
1633 {
1634         struct acm *acm = usb_get_intfdata(intf);
1635
1636         clear_bit(EVENT_RX_STALL, &acm->flags);
1637         acm->nb_index = 0; /* pending control transfers are lost */
1638
1639         return 0;
1640 }
1641
1642 #define NOKIA_PCSUITE_ACM_INFO(x) \
1643                 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1644                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1645                 USB_CDC_ACM_PROTO_VENDOR)
1646
1647 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1648                 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1649                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1650                 USB_CDC_ACM_PROTO_VENDOR)
1651
1652 /*
1653  * USB driver structure.
1654  */
1655
1656 static const struct usb_device_id acm_ids[] = {
1657         /* quirky and broken devices */
1658         { USB_DEVICE(0x076d, 0x0006), /* Denso Cradle CU-321 */
1659         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1660         { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1661         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1662         { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1663         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1664         },
1665         { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1666         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1667         },
1668         { USB_DEVICE(0x0e8d, 0x2000), /* MediaTek Inc Preloader */
1669         .driver_info = DISABLE_ECHO, /* DISABLE ECHO in termios flag */
1670         },
1671         { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1672         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1673         },
1674         { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1675         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1676         },
1677         { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1678         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1679         },
1680         { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1681         .driver_info = SINGLE_RX_URB,
1682         },
1683         { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1684         .driver_info = SINGLE_RX_URB, /* firmware bug */
1685         },
1686         { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1687         .driver_info = SINGLE_RX_URB, /* firmware bug */
1688         },
1689         { USB_DEVICE(0x11ca, 0x0201), /* VeriFone Mx870 Gadget Serial */
1690         .driver_info = SINGLE_RX_URB,
1691         },
1692         { USB_DEVICE(0x1965, 0x0018), /* Uniden UBC125XLT */
1693         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1694         },
1695         { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1696         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1697         },
1698         { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1699         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1700         },
1701         { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1702         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1703         },
1704         { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1705         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1706         },
1707         { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1708         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1709         },
1710         { USB_DEVICE(0x0572, 0x1349), /* Hiro (Conexant) USB MODEM H50228 */
1711         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1712         },
1713         { USB_DEVICE(0x20df, 0x0001), /* Simtec Electronics Entropy Key */
1714         .driver_info = QUIRK_CONTROL_LINE_STATE, },
1715         { USB_DEVICE(0x2184, 0x001c) }, /* GW Instek AFG-2225 */
1716         { USB_DEVICE(0x2184, 0x0036) }, /* GW Instek AFG-125 */
1717         { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1718         },
1719         /* Motorola H24 HSPA module: */
1720         { USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1721         { USB_DEVICE(0x22b8, 0x2d92),   /* modem           + diagnostics        */
1722         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1723         },
1724         { USB_DEVICE(0x22b8, 0x2d93),   /* modem + AT port                      */
1725         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1726         },
1727         { USB_DEVICE(0x22b8, 0x2d95),   /* modem + AT port + diagnostics        */
1728         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1729         },
1730         { USB_DEVICE(0x22b8, 0x2d96),   /* modem                         + NMEA */
1731         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1732         },
1733         { USB_DEVICE(0x22b8, 0x2d97),   /* modem           + diagnostics + NMEA */
1734         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1735         },
1736         { USB_DEVICE(0x22b8, 0x2d99),   /* modem + AT port               + NMEA */
1737         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1738         },
1739         { USB_DEVICE(0x22b8, 0x2d9a),   /* modem + AT port + diagnostics + NMEA */
1740         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1741         },
1742
1743         { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1744         .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1745                                            data interface instead of
1746                                            communications interface.
1747                                            Maybe we should define a new
1748                                            quirk for this. */
1749         },
1750         { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1751         .driver_info = NO_UNION_NORMAL,
1752         },
1753         { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1754         .driver_info = NO_UNION_NORMAL,
1755         },
1756         { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1757         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1758         },
1759         { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1760         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1761         },
1762         { USB_DEVICE(0xfff0, 0x0100), /* DATECS FP-2000 */
1763         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1764         },
1765         { USB_DEVICE(0x09d8, 0x0320), /* Elatec GmbH TWN3 */
1766         .driver_info = NO_UNION_NORMAL, /* has misplaced union descriptor */
1767         },
1768         { USB_DEVICE(0x0ca6, 0xa050), /* Castles VEGA3000 */
1769         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1770         },
1771
1772         { USB_DEVICE(0x2912, 0x0001), /* ATOL FPrint */
1773         .driver_info = CLEAR_HALT_CONDITIONS,
1774         },
1775
1776         /* Nokia S60 phones expose two ACM channels. The first is
1777          * a modem and is picked up by the standard AT-command
1778          * information below. The second is 'vendor-specific' but
1779          * is treated as a serial device at the S60 end, so we want
1780          * to expose it on Linux too. */
1781         { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1782         { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1783         { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1784         { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1785         { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1786         { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1787         { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1788         { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1789         { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1790         { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1791         { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1792         { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1793         { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1794         { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1795         { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1796         { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1797         { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1798         { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1799         { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1800         { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1801         { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1802         { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1803         { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1804         { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1805         { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1806         { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1807         { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1808         { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1809         { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1810         { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1811         { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1812         { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
1813         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1814         { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1815         { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1816         { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1817         { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1818         { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1819         { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1820         { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1821         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1822         { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1823         { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1824         { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1825         { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1826         { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1827         { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1828         { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1829         { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1830         { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1831         { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1832         { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1833         { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1834         { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1835         { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1836         { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1837         { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1838         { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1839
1840         /* Support for Owen devices */
1841         { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1842
1843         /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1844
1845         /* Support for Droids MuIn LCD */
1846         { USB_DEVICE(0x04d8, 0x000b),
1847         .driver_info = NO_DATA_INTERFACE,
1848         },
1849
1850 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1851         { USB_DEVICE(0x04d8, 0x0082),   /* Application mode */
1852         .driver_info = IGNORE_DEVICE,
1853         },
1854         { USB_DEVICE(0x04d8, 0x0083),   /* Bootloader mode */
1855         .driver_info = IGNORE_DEVICE,
1856         },
1857 #endif
1858
1859         /*Samsung phone in firmware update mode */
1860         { USB_DEVICE(0x04e8, 0x685d),
1861         .driver_info = IGNORE_DEVICE,
1862         },
1863
1864         /* Exclude Infineon Flash Loader utility */
1865         { USB_DEVICE(0x058b, 0x0041),
1866         .driver_info = IGNORE_DEVICE,
1867         },
1868
1869         { USB_DEVICE(0x1bc7, 0x0021), /* Telit 3G ACM only composition */
1870         .driver_info = SEND_ZERO_PACKET,
1871         },
1872         { USB_DEVICE(0x1bc7, 0x0023), /* Telit 3G ACM + ECM composition */
1873         .driver_info = SEND_ZERO_PACKET,
1874         },
1875
1876         /* control interfaces without any protocol set */
1877         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1878                 USB_CDC_PROTO_NONE) },
1879
1880         /* control interfaces with various AT-command sets */
1881         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1882                 USB_CDC_ACM_PROTO_AT_V25TER) },
1883         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1884                 USB_CDC_ACM_PROTO_AT_PCCA101) },
1885         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1886                 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1887         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1888                 USB_CDC_ACM_PROTO_AT_GSM) },
1889         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1890                 USB_CDC_ACM_PROTO_AT_3G) },
1891         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1892                 USB_CDC_ACM_PROTO_AT_CDMA) },
1893
1894         { USB_DEVICE(0x1519, 0x0452), /* Intel 7260 modem */
1895         .driver_info = SEND_ZERO_PACKET,
1896         },
1897
1898         { }
1899 };
1900
1901 MODULE_DEVICE_TABLE(usb, acm_ids);
1902
1903 static struct usb_driver acm_driver = {
1904         .name =         "cdc_acm",
1905         .probe =        acm_probe,
1906         .disconnect =   acm_disconnect,
1907 #ifdef CONFIG_PM
1908         .suspend =      acm_suspend,
1909         .resume =       acm_resume,
1910         .reset_resume = acm_reset_resume,
1911 #endif
1912         .pre_reset =    acm_pre_reset,
1913         .id_table =     acm_ids,
1914 #ifdef CONFIG_PM
1915         .supports_autosuspend = 1,
1916 #endif
1917         .disable_hub_initiated_lpm = 1,
1918 };
1919
1920 /*
1921  * TTY driver structures.
1922  */
1923
1924 static const struct tty_operations acm_ops = {
1925         .install =              acm_tty_install,
1926         .open =                 acm_tty_open,
1927         .close =                acm_tty_close,
1928         .cleanup =              acm_tty_cleanup,
1929         .hangup =               acm_tty_hangup,
1930         .write =                acm_tty_write,
1931         .write_room =           acm_tty_write_room,
1932         .ioctl =                acm_tty_ioctl,
1933         .throttle =             acm_tty_throttle,
1934         .unthrottle =           acm_tty_unthrottle,
1935         .chars_in_buffer =      acm_tty_chars_in_buffer,
1936         .break_ctl =            acm_tty_break_ctl,
1937         .set_termios =          acm_tty_set_termios,
1938         .tiocmget =             acm_tty_tiocmget,
1939         .tiocmset =             acm_tty_tiocmset,
1940         .get_serial =           get_serial_info,
1941         .set_serial =           set_serial_info,
1942         .get_icount =           acm_tty_get_icount,
1943 };
1944
1945 /*
1946  * Init / exit.
1947  */
1948
1949 static int __init acm_init(void)
1950 {
1951         int retval;
1952         acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1953         if (!acm_tty_driver)
1954                 return -ENOMEM;
1955         acm_tty_driver->driver_name = "acm",
1956         acm_tty_driver->name = "ttyACM",
1957         acm_tty_driver->major = ACM_TTY_MAJOR,
1958         acm_tty_driver->minor_start = 0,
1959         acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1960         acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1961         acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1962         acm_tty_driver->init_termios = tty_std_termios;
1963         acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1964                                                                 HUPCL | CLOCAL;
1965         tty_set_operations(acm_tty_driver, &acm_ops);
1966
1967         retval = tty_register_driver(acm_tty_driver);
1968         if (retval) {
1969                 put_tty_driver(acm_tty_driver);
1970                 return retval;
1971         }
1972
1973         retval = usb_register(&acm_driver);
1974         if (retval) {
1975                 tty_unregister_driver(acm_tty_driver);
1976                 put_tty_driver(acm_tty_driver);
1977                 return retval;
1978         }
1979
1980         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1981
1982         return 0;
1983 }
1984
1985 static void __exit acm_exit(void)
1986 {
1987         usb_deregister(&acm_driver);
1988         tty_unregister_driver(acm_tty_driver);
1989         put_tty_driver(acm_tty_driver);
1990         idr_destroy(&acm_minors);
1991 }
1992
1993 module_init(acm_init);
1994 module_exit(acm_exit);
1995
1996 MODULE_AUTHOR(DRIVER_AUTHOR);
1997 MODULE_DESCRIPTION(DRIVER_DESC);
1998 MODULE_LICENSE("GPL");
1999 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);