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         struct usb_cdc_notification *dr = (struct usb_cdc_notification *)buf;
 280         unsigned char *data = buf + sizeof(struct usb_cdc_notification);
 281
 282         switch (dr->bNotificationType) {
 283         case USB_CDC_NOTIFY_NETWORK_CONNECTION:
 284                 dev_dbg(&acm->control->dev,
 285                         "%s - network connection: %d\n", __func__, dr->wValue);
 286                 break;
 287
 288         case USB_CDC_NOTIFY_SERIAL_STATE:
 289                 if (le16_to_cpu(dr->wLength) != 2) {
 290                         dev_dbg(&acm->control->dev,
 291                                 "%s - malformed serial state\n", __func__);
 292                         break;
 293                 }
 294
 295                 newctrl = get_unaligned_le16(data);
 296                 dev_dbg(&acm->control->dev,
 297                         "%s - serial state: 0x%x\n", __func__, newctrl);
 298
 299                 if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
 300                         dev_dbg(&acm->control->dev,
 301                                 "%s - calling hangup\n", __func__);
 302                         tty_port_tty_hangup(&acm->port, false);
 303                 }
 304
 305                 difference = acm->ctrlin ^ newctrl;
 306                 spin_lock(&acm->read_lock);
 307                 acm->ctrlin = newctrl;
 308                 acm->oldcount = acm->iocount;
 309
 310                 if (difference & ACM_CTRL_DSR)
 311                         acm->iocount.dsr++;
 312                 if (difference & ACM_CTRL_BRK)
 313                         acm->iocount.brk++;
 314                 if (difference & ACM_CTRL_RI)
 315                         acm->iocount.rng++;
 316                 if (difference & ACM_CTRL_DCD)
 317                         acm->iocount.dcd++;
 318                 if (difference & ACM_CTRL_FRAMING)
 319                         acm->iocount.frame++;
 320                 if (difference & ACM_CTRL_PARITY)
 321                         acm->iocount.parity++;
 322                 if (difference & ACM_CTRL_OVERRUN)
 323                         acm->iocount.overrun++;
 324                 spin_unlock(&acm->read_lock);
 325
 326                 if (difference)
 327                         wake_up_all(&acm->wioctl);
 328
 329                 break;
 330
 331         default:
 332                 dev_dbg(&acm->control->dev,
 333                         "%s - unknown notification %d received: index %d len %d\n",
 334                         __func__,
 335                         dr->bNotificationType, dr->wIndex, dr->wLength);
 336         }
 337 }
 338
 339 /* control interface reports status changes with "interrupt" transfers */
 340 static void acm_ctrl_irq(struct urb *urb)
 341 {
 342         struct acm *acm = urb->context;
 343         struct usb_cdc_notification *dr = urb->transfer_buffer;
 344         unsigned int current_size = urb->actual_length;
 345         unsigned int expected_size, copy_size, alloc_size;
 346         int retval;
 347         int status = urb->status;
 348
 349         switch (status) {
 350         case 0:
 351                 /* success */
 352                 break;
 353         case -ECONNRESET:
 354         case -ENOENT:
 355         case -ESHUTDOWN:
 356                 /* this urb is terminated, clean up */
 357                 acm->nb_index = 0;
 358                 dev_dbg(&acm->control->dev,
 359                         "%s - urb shutting down with status: %d\n",
 360                         __func__, status);
 361                 return;
 362         default:
 363                 dev_dbg(&acm->control->dev,
 364                         "%s - nonzero urb status received: %d\n",
 365                         __func__, status);
 366                 goto exit;
 367         }
 368
 369         usb_mark_last_busy(acm->dev);
 370
 371         if (acm->nb_index)
 372                 dr = (struct usb_cdc_notification *)acm->notification_buffer;
 373
 374         /* size = notification-header + (optional) data */
 375         expected_size = sizeof(struct usb_cdc_notification) +
 376                                         le16_to_cpu(dr->wLength);
 377
 378         if (current_size < expected_size) {
 379                 /* notification is transmitted fragmented, reassemble */
 380                 if (acm->nb_size < expected_size) {
 381                         if (acm->nb_size) {
 382                                 kfree(acm->notification_buffer);
 383                                 acm->nb_size = 0;
 384                         }
 385                         alloc_size = roundup_pow_of_two(expected_size);
 386                         /*
 387                          * kmalloc ensures a valid notification_buffer after a
 388                          * use of kfree in case the previous allocation was too
 389                          * small. Final freeing is done on disconnect.
 390                          */
 391                         acm->notification_buffer =
 392                                 kmalloc(alloc_size, GFP_ATOMIC);
 393                         if (!acm->notification_buffer)
 394                                 goto exit;
 395                         acm->nb_size = alloc_size;
 396                 }
 397
 398                 copy_size = min(current_size,
 399                                 expected_size - acm->nb_index);
 400
 401                 memcpy(&acm->notification_buffer[acm->nb_index],
 402                        urb->transfer_buffer, copy_size);
 403                 acm->nb_index += copy_size;
 404                 current_size = acm->nb_index;
 405         }
 406
 407         if (current_size >= expected_size) {
 408                 /* notification complete */
 409                 acm_process_notification(acm, (unsigned char *)dr);
 410                 acm->nb_index = 0;
 411         }
 412
 413 exit:
 414         retval = usb_submit_urb(urb, GFP_ATOMIC);
 415         if (retval && retval != -EPERM)
 416                 dev_err(&acm->control->dev,
 417                         "%s - usb_submit_urb failed: %d\n", __func__, retval);
 418 }
 419
 420 static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
 421 {
 422         int res;
 423
 424         if (!test_and_clear_bit(index, &acm->read_urbs_free))
 425                 return 0;
 426
 427         res = usb_submit_urb(acm->read_urbs[index], mem_flags);
 428         if (res) {
 429                 if (res != -EPERM && res != -ENODEV) {
 430                         dev_err(&acm->data->dev,
 431                                 "urb %d failed submission with %d\n",
 432                                 index, res);
 433                 }
 434                 set_bit(index, &acm->read_urbs_free);
 435                 return res;
 436         } else {
 437                 dev_vdbg(&acm->data->dev, "submitted urb %d\n", index);
 438         }
 439
 440         return 0;
 441 }
 442
 443 static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
 444 {
 445         int res;
 446         int i;
 447
 448         for (i = 0; i < acm->rx_buflimit; ++i) {
 449                 res = acm_submit_read_urb(acm, i, mem_flags);
 450                 if (res)
 451                         return res;
 452         }
 453
 454         return 0;
 455 }
 456
 457 static void acm_process_read_urb(struct acm *acm, struct urb *urb)
 458 {
 459         if (!urb->actual_length)
 460                 return;
 461
 462         tty_insert_flip_string(&acm->port, urb->transfer_buffer,
 463                         urb->actual_length);
 464         tty_flip_buffer_push(&acm->port);
 465 }
 466
 467 static void acm_read_bulk_callback(struct urb *urb)
 468 {
 469         struct acm_rb *rb = urb->context;
 470         struct acm *acm = rb->instance;
 471         unsigned long flags;
 472         int status = urb->status;
 473
 474         dev_vdbg(&acm->data->dev, "got urb %d, len %d, status %d\n",
 475                 rb->index, urb->actual_length, status);
 476
 477         set_bit(rb->index, &acm->read_urbs_free);
 478
 479         if (!acm->dev) {
 480                 dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
 481                 return;
 482         }
 483
 484         switch (status) {
 485         case 0:
 486                 usb_mark_last_busy(acm->dev);
 487                 acm_process_read_urb(acm, urb);
 488                 break;
 489         case -EPIPE:
 490                 set_bit(EVENT_RX_STALL, &acm->flags);
 491                 schedule_work(&acm->work);
 492                 return;
 493         case -ENOENT:
 494         case -ECONNRESET:
 495         case -ESHUTDOWN:
 496                 dev_dbg(&acm->data->dev,
 497                         "%s - urb shutting down with status: %d\n",
 498                         __func__, status);
 499                 return;
 500         default:
 501                 dev_dbg(&acm->data->dev,
 502                         "%s - nonzero urb status received: %d\n",
 503                         __func__, status);
 504                 break;
 505         }
 506
 507         /*
 508          * Unthrottle may run on another CPU which needs to see events
 509          * in the same order. Submission has an implict barrier
 510          */
 511         smp_mb__before_atomic();
 512
 513         /* throttle device if requested by tty */
 514         spin_lock_irqsave(&acm->read_lock, flags);
 515         acm->throttled = acm->throttle_req;
 516         if (!acm->throttled) {
 517                 spin_unlock_irqrestore(&acm->read_lock, flags);
 518                 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
 519         } else {
 520                 spin_unlock_irqrestore(&acm->read_lock, flags);
 521         }
 522 }
 523
 524 /* data interface wrote those outgoing bytes */
 525 static void acm_write_bulk(struct urb *urb)
 526 {
 527         struct acm_wb *wb = urb->context;
 528         struct acm *acm = wb->instance;
 529         unsigned long flags;
 530         int status = urb->status;
 531
 532         if (status || (urb->actual_length != urb->transfer_buffer_length))
 533                 dev_vdbg(&acm->data->dev, "wrote len %d/%d, status %d\n",
 534                         urb->actual_length,
 535                         urb->transfer_buffer_length,
 536                         status);
 537
 538         spin_lock_irqsave(&acm->write_lock, flags);
 539         acm_write_done(acm, wb);
 540         spin_unlock_irqrestore(&acm->write_lock, flags);
 541         set_bit(EVENT_TTY_WAKEUP, &acm->flags);
 542         schedule_work(&acm->work);
 543 }
 544
 545 static void acm_softint(struct work_struct *work)
 546 {
 547         int i;
 548         struct acm *acm = container_of(work, struct acm, work);
 549
 550         if (test_bit(EVENT_RX_STALL, &acm->flags)) {
 551                 if (!(usb_autopm_get_interface(acm->data))) {
 552                         for (i = 0; i < acm->rx_buflimit; i++)
 553                                 usb_kill_urb(acm->read_urbs[i]);
 554                         usb_clear_halt(acm->dev, acm->in);
 555                         acm_submit_read_urbs(acm, GFP_KERNEL);
 556                         usb_autopm_put_interface(acm->data);
 557                 }
 558                 clear_bit(EVENT_RX_STALL, &acm->flags);
 559         }
 560
 561         if (test_bit(EVENT_TTY_WAKEUP, &acm->flags)) {
 562                 tty_port_tty_wakeup(&acm->port);
 563                 clear_bit(EVENT_TTY_WAKEUP, &acm->flags);
 564         }
 565 }
 566
 567 /*
 568  * TTY handlers
 569  */
 570
 571 static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
 572 {
 573         struct acm *acm;
 574         int retval;
 575
 576         acm = acm_get_by_minor(tty->index);
 577         if (!acm)
 578                 return -ENODEV;
 579
 580         retval = tty_standard_install(driver, tty);
 581         if (retval)
 582                 goto error_init_termios;
 583
 584         tty->driver_data = acm;
 585
 586         return 0;
 587
 588 error_init_termios:
 589         tty_port_put(&acm->port);
 590         return retval;
 591 }
 592
 593 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
 594 {
 595         struct acm *acm = tty->driver_data;
 596
 597         return tty_port_open(&acm->port, tty, filp);
 598 }
 599
 600 static void acm_port_dtr_rts(struct tty_port *port, int raise)
 601 {
 602         struct acm *acm = container_of(port, struct acm, port);
 603         int val;
 604         int res;
 605
 606         if (raise)
 607                 val = ACM_CTRL_DTR | ACM_CTRL_RTS;
 608         else
 609                 val = 0;
 610
 611         /* FIXME: add missing ctrlout locking throughout driver */
 612         acm->ctrlout = val;
 613
 614         res = acm_set_control(acm, val);
 615         if (res && (acm->ctrl_caps & USB_CDC_CAP_LINE))
 616                 dev_err(&acm->control->dev, "failed to set dtr/rts\n");
 617 }
 618
 619 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
 620 {
 621         struct acm *acm = container_of(port, struct acm, port);
 622         int retval = -ENODEV;
 623         int i;
 624
 625         mutex_lock(&acm->mutex);
 626         if (acm->disconnected)
 627                 goto disconnected;
 628
 629         retval = usb_autopm_get_interface(acm->control);
 630         if (retval)
 631                 goto error_get_interface;
 632
 633         /*
 634          * FIXME: Why do we need this? Allocating 64K of physically contiguous
 635          * memory is really nasty...
 636          */
 637         set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
 638         acm->control->needs_remote_wakeup = 1;
 639
 640         acm->ctrlurb->dev = acm->dev;
 641         retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
 642         if (retval) {
 643                 dev_err(&acm->control->dev,
 644                         "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
 645                 goto error_submit_urb;
 646         }
 647
 648         acm_tty_set_termios(tty, NULL);
 649
 650         /*
 651          * Unthrottle device in case the TTY was closed while throttled.
 652          */
 653         spin_lock_irq(&acm->read_lock);
 654         acm->throttled = 0;
 655         acm->throttle_req = 0;
 656         spin_unlock_irq(&acm->read_lock);
 657
 658         retval = acm_submit_read_urbs(acm, GFP_KERNEL);
 659         if (retval)
 660                 goto error_submit_read_urbs;
 661
 662         usb_autopm_put_interface(acm->control);
 663
 664         mutex_unlock(&acm->mutex);
 665
 666         return 0;
 667
 668 error_submit_read_urbs:
 669         for (i = 0; i < acm->rx_buflimit; i++)
 670                 usb_kill_urb(acm->read_urbs[i]);
 671         usb_kill_urb(acm->ctrlurb);
 672 error_submit_urb:
 673         usb_autopm_put_interface(acm->control);
 674 error_get_interface:
 675 disconnected:
 676         mutex_unlock(&acm->mutex);
 677
 678         return usb_translate_errors(retval);
 679 }
 680
 681 static void acm_port_destruct(struct tty_port *port)
 682 {
 683         struct acm *acm = container_of(port, struct acm, port);
 684
 685         acm_release_minor(acm);
 686         usb_put_intf(acm->control);
 687         kfree(acm->country_codes);
 688         kfree(acm);
 689 }
 690
 691 static void acm_port_shutdown(struct tty_port *port)
 692 {
 693         struct acm *acm = container_of(port, struct acm, port);
 694         struct urb *urb;
 695         struct acm_wb *wb;
 696
 697         /*
 698          * Need to grab write_lock to prevent race with resume, but no need to
 699          * hold it due to the tty-port initialised flag.
 700          */
 701         spin_lock_irq(&acm->write_lock);
 702         spin_unlock_irq(&acm->write_lock);
 703
 704         usb_autopm_get_interface_no_resume(acm->control);
 705         acm->control->needs_remote_wakeup = 0;
 706         usb_autopm_put_interface(acm->control);
 707
 708         for (;;) {
 709                 urb = usb_get_from_anchor(&acm->delayed);
 710                 if (!urb)
 711                         break;
 712                 wb = urb->context;
 713                 wb->use = 0;
 714                 usb_autopm_put_interface_async(acm->control);
 715         }
 716
 717         acm_kill_urbs(acm);
 718 }
 719
 720 static void acm_tty_cleanup(struct tty_struct *tty)
 721 {
 722         struct acm *acm = tty->driver_data;
 723
 724         tty_port_put(&acm->port);
 725 }
 726
 727 static void acm_tty_hangup(struct tty_struct *tty)
 728 {
 729         struct acm *acm = tty->driver_data;
 730
 731         tty_port_hangup(&acm->port);
 732 }
 733
 734 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
 735 {
 736         struct acm *acm = tty->driver_data;
 737
 738         tty_port_close(&acm->port, tty, filp);
 739 }
 740
 741 static int acm_tty_write(struct tty_struct *tty,
 742                                         const unsigned char *buf, int count)
 743 {
 744         struct acm *acm = tty->driver_data;
 745         int stat;
 746         unsigned long flags;
 747         int wbn;
 748         struct acm_wb *wb;
 749
 750         if (!count)
 751                 return 0;
 752
 753         dev_vdbg(&acm->data->dev, "%d bytes from tty layer\n", count);
 754
 755         spin_lock_irqsave(&acm->write_lock, flags);
 756         wbn = acm_wb_alloc(acm);
 757         if (wbn < 0) {
 758                 spin_unlock_irqrestore(&acm->write_lock, flags);
 759                 return 0;
 760         }
 761         wb = &acm->wb[wbn];
 762
 763         if (!acm->dev) {
 764                 wb->use = 0;
 765                 spin_unlock_irqrestore(&acm->write_lock, flags);
 766                 return -ENODEV;
 767         }
 768
 769         count = (count > acm->writesize) ? acm->writesize : count;
 770         dev_vdbg(&acm->data->dev, "writing %d bytes\n", count);
 771         memcpy(wb->buf, buf, count);
 772         wb->len = count;
 773
 774         stat = usb_autopm_get_interface_async(acm->control);
 775         if (stat) {
 776                 wb->use = 0;
 777                 spin_unlock_irqrestore(&acm->write_lock, flags);
 778                 return stat;
 779         }
 780
 781         if (acm->susp_count) {
 782                 if (acm->putbuffer) {
 783                         /* now to preserve order */
 784                         usb_anchor_urb(acm->putbuffer->urb, &acm->delayed);
 785                         acm->putbuffer = NULL;
 786                 }
 787                 usb_anchor_urb(wb->urb, &acm->delayed);
 788                 spin_unlock_irqrestore(&acm->write_lock, flags);
 789                 return count;
 790         } else {
 791                 if (acm->putbuffer) {
 792                         /* at this point there is no good way to handle errors */
 793                         acm_start_wb(acm, acm->putbuffer);
 794                         acm->putbuffer = NULL;
 795                 }
 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 void acm_tty_flush_chars(struct tty_struct *tty)
 807 {
 808         struct acm *acm = tty->driver_data;
 809         struct acm_wb *cur;
 810         int err;
 811         unsigned long flags;
 812
 813         spin_lock_irqsave(&acm->write_lock, flags);
 814
 815         cur = acm->putbuffer;
 816         if (!cur) /* nothing to do */
 817                 goto out;
 818
 819         acm->putbuffer = NULL;
 820         err = usb_autopm_get_interface_async(acm->control);
 821         if (err < 0) {
 822                 cur->use = 0;
 823                 acm->putbuffer = cur;
 824                 goto out;
 825         }
 826
 827         if (acm->susp_count)
 828                 usb_anchor_urb(cur->urb, &acm->delayed);
 829         else
 830                 acm_start_wb(acm, cur);
 831 out:
 832         spin_unlock_irqrestore(&acm->write_lock, flags);
 833         return;
 834 }
 835
 836 static int acm_tty_put_char(struct tty_struct *tty, unsigned char ch)
 837 {
 838         struct acm *acm = tty->driver_data;
 839         struct acm_wb *cur;
 840         int wbn;
 841         unsigned long flags;
 842
 843 overflow:
 844         cur = acm->putbuffer;
 845         if (!cur) {
 846                 spin_lock_irqsave(&acm->write_lock, flags);
 847                 wbn = acm_wb_alloc(acm);
 848                 if (wbn >= 0) {
 849                         cur = &acm->wb[wbn];
 850                         acm->putbuffer = cur;
 851                 }
 852                 spin_unlock_irqrestore(&acm->write_lock, flags);
 853                 if (!cur)
 854                         return 0;
 855         }
 856
 857         if (cur->len == acm->writesize) {
 858                 acm_tty_flush_chars(tty);
 859                 goto overflow;
 860         }
 861
 862         cur->buf[cur->len++] = ch;
 863         return 1;
 864 }
 865
 866 static int acm_tty_write_room(struct tty_struct *tty)
 867 {
 868         struct acm *acm = tty->driver_data;
 869         /*
 870          * Do not let the line discipline to know that we have a reserve,
 871          * or it might get too enthusiastic.
 872          */
 873         return acm_wb_is_avail(acm) ? acm->writesize : 0;
 874 }
 875
 876 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
 877 {
 878         struct acm *acm = tty->driver_data;
 879         /*
 880          * if the device was unplugged then any remaining characters fell out
 881          * of the connector ;)
 882          */
 883         if (acm->disconnected)
 884                 return 0;
 885         /*
 886          * This is inaccurate (overcounts), but it works.
 887          */
 888         return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
 889 }
 890
 891 static void acm_tty_throttle(struct tty_struct *tty)
 892 {
 893         struct acm *acm = tty->driver_data;
 894
 895         spin_lock_irq(&acm->read_lock);
 896         acm->throttle_req = 1;
 897         spin_unlock_irq(&acm->read_lock);
 898 }
 899
 900 static void acm_tty_unthrottle(struct tty_struct *tty)
 901 {
 902         struct acm *acm = tty->driver_data;
 903         unsigned int was_throttled;
 904
 905         spin_lock_irq(&acm->read_lock);
 906         was_throttled = acm->throttled;
 907         acm->throttled = 0;
 908         acm->throttle_req = 0;
 909         spin_unlock_irq(&acm->read_lock);
 910
 911         if (was_throttled)
 912                 acm_submit_read_urbs(acm, GFP_KERNEL);
 913 }
 914
 915 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
 916 {
 917         struct acm *acm = tty->driver_data;
 918         int retval;
 919
 920         retval = acm_send_break(acm, state ? 0xffff : 0);
 921         if (retval < 0)
 922                 dev_dbg(&acm->control->dev,
 923                         "%s - send break failed\n", __func__);
 924         return retval;
 925 }
 926
 927 static int acm_tty_tiocmget(struct tty_struct *tty)
 928 {
 929         struct acm *acm = tty->driver_data;
 930
 931         return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
 932                (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
 933                (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
 934                (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
 935                (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
 936                TIOCM_CTS;
 937 }
 938
 939 static int acm_tty_tiocmset(struct tty_struct *tty,
 940                             unsigned int set, unsigned int clear)
 941 {
 942         struct acm *acm = tty->driver_data;
 943         unsigned int newctrl;
 944
 945         newctrl = acm->ctrlout;
 946         set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 947                                         (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 948         clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 949                                         (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 950
 951         newctrl = (newctrl & ~clear) | set;
 952
 953         if (acm->ctrlout == newctrl)
 954                 return 0;
 955         return acm_set_control(acm, acm->ctrlout = newctrl);
 956 }
 957
 958 static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
 959 {
 960         struct serial_struct tmp;
 961
 962         memset(&tmp, 0, sizeof(tmp));
 963         tmp.xmit_fifo_size = acm->writesize;
 964         tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
 965         tmp.close_delay = acm->port.close_delay / 10;
 966         tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 967                                 ASYNC_CLOSING_WAIT_NONE :
 968                                 acm->port.closing_wait / 10;
 969
 970         if (copy_to_user(info, &tmp, sizeof(tmp)))
 971                 return -EFAULT;
 972         else
 973                 return 0;
 974 }
 975
 976 static int set_serial_info(struct acm *acm,
 977                                 struct serial_struct __user *newinfo)
 978 {
 979         struct serial_struct new_serial;
 980         unsigned int closing_wait, close_delay;
 981         int retval = 0;
 982
 983         if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
 984                 return -EFAULT;
 985
 986         close_delay = new_serial.close_delay * 10;
 987         closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 988                         ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
 989
 990         mutex_lock(&acm->port.mutex);
 991
 992         if (!capable(CAP_SYS_ADMIN)) {
 993                 if ((close_delay != acm->port.close_delay) ||
 994                     (closing_wait != acm->port.closing_wait))
 995                         retval = -EPERM;
 996                 else
 997                         retval = -EOPNOTSUPP;
 998         } else {
 999                 acm->port.close_delay  = close_delay;
1000                 acm->port.closing_wait = closing_wait;
1001         }
1002
1003         mutex_unlock(&acm->port.mutex);
1004         return retval;
1005 }
1006
1007 static int wait_serial_change(struct acm *acm, unsigned long arg)
1008 {
1009         int rv = 0;
1010         DECLARE_WAITQUEUE(wait, current);
1011         struct async_icount old, new;
1012
1013         do {
1014                 spin_lock_irq(&acm->read_lock);
1015                 old = acm->oldcount;
1016                 new = acm->iocount;
1017                 acm->oldcount = new;
1018                 spin_unlock_irq(&acm->read_lock);
1019
1020                 if ((arg & TIOCM_DSR) &&
1021                         old.dsr != new.dsr)
1022                         break;
1023                 if ((arg & TIOCM_CD)  &&
1024                         old.dcd != new.dcd)
1025                         break;
1026                 if ((arg & TIOCM_RI) &&
1027                         old.rng != new.rng)
1028                         break;
1029
1030                 add_wait_queue(&acm->wioctl, &wait);
1031                 set_current_state(TASK_INTERRUPTIBLE);
1032                 schedule();
1033                 remove_wait_queue(&acm->wioctl, &wait);
1034                 if (acm->disconnected) {
1035                         if (arg & TIOCM_CD)
1036                                 break;
1037                         else
1038                                 rv = -ENODEV;
1039                 } else {
1040                         if (signal_pending(current))
1041                                 rv = -ERESTARTSYS;
1042                 }
1043         } while (!rv);
1044
1045
1046
1047         return rv;
1048 }
1049
1050 static int acm_tty_get_icount(struct tty_struct *tty,
1051                                         struct serial_icounter_struct *icount)
1052 {
1053         struct acm *acm = tty->driver_data;
1054
1055         icount->dsr = acm->iocount.dsr;
1056         icount->rng = acm->iocount.rng;
1057         icount->dcd = acm->iocount.dcd;
1058         icount->frame = acm->iocount.frame;
1059         icount->overrun = acm->iocount.overrun;
1060         icount->parity = acm->iocount.parity;
1061         icount->brk = acm->iocount.brk;
1062
1063         return 0;
1064 }
1065
1066 static int acm_tty_ioctl(struct tty_struct *tty,
1067                                         unsigned int cmd, unsigned long arg)
1068 {
1069         struct acm *acm = tty->driver_data;
1070         int rv = -ENOIOCTLCMD;
1071
1072         switch (cmd) {
1073         case TIOCGSERIAL: /* gets serial port data */
1074                 rv = get_serial_info(acm, (struct serial_struct __user *) arg);
1075                 break;
1076         case TIOCSSERIAL:
1077                 rv = set_serial_info(acm, (struct serial_struct __user *) arg);
1078                 break;
1079         case TIOCMIWAIT:
1080                 rv = usb_autopm_get_interface(acm->control);
1081                 if (rv < 0) {
1082                         rv = -EIO;
1083                         break;
1084                 }
1085                 rv = wait_serial_change(acm, arg);
1086                 usb_autopm_put_interface(acm->control);
1087                 break;
1088         }
1089
1090         return rv;
1091 }
1092
1093 static void acm_tty_set_termios(struct tty_struct *tty,
1094                                                 struct ktermios *termios_old)
1095 {
1096         struct acm *acm = tty->driver_data;
1097         struct ktermios *termios = &tty->termios;
1098         struct usb_cdc_line_coding newline;
1099         int newctrl = acm->ctrlout;
1100
1101         newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
1102         newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
1103         newline.bParityType = termios->c_cflag & PARENB ?
1104                                 (termios->c_cflag & PARODD ? 1 : 2) +
1105                                 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
1106         switch (termios->c_cflag & CSIZE) {
1107         case CS5:
1108                 newline.bDataBits = 5;
1109                 break;
1110         case CS6:
1111                 newline.bDataBits = 6;
1112                 break;
1113         case CS7:
1114                 newline.bDataBits = 7;
1115                 break;
1116         case CS8:
1117         default:
1118                 newline.bDataBits = 8;
1119                 break;
1120         }
1121         /* FIXME: Needs to clear unsupported bits in the termios */
1122         acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
1123
1124         if (C_BAUD(tty) == B0) {
1125                 newline.dwDTERate = acm->line.dwDTERate;
1126                 newctrl &= ~ACM_CTRL_DTR;
1127         } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
1128                 newctrl |=  ACM_CTRL_DTR;
1129         }
1130
1131         if (newctrl != acm->ctrlout)
1132                 acm_set_control(acm, acm->ctrlout = newctrl);
1133
1134         if (memcmp(&acm->line, &newline, sizeof newline)) {
1135                 memcpy(&acm->line, &newline, sizeof newline);
1136                 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
1137                         __func__,
1138                         le32_to_cpu(newline.dwDTERate),
1139                         newline.bCharFormat, newline.bParityType,
1140                         newline.bDataBits);
1141                 acm_set_line(acm, &acm->line);
1142         }
1143 }
1144
1145 static const struct tty_port_operations acm_port_ops = {
1146         .dtr_rts = acm_port_dtr_rts,
1147         .shutdown = acm_port_shutdown,
1148         .activate = acm_port_activate,
1149         .destruct = acm_port_destruct,
1150 };
1151
1152 /*
1153  * USB probe and disconnect routines.
1154  */
1155
1156 /* Little helpers: write/read buffers free */
1157 static void acm_write_buffers_free(struct acm *acm)
1158 {
1159         int i;
1160         struct acm_wb *wb;
1161
1162         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1163                 usb_free_coherent(acm->dev, acm->writesize, wb->buf, wb->dmah);
1164 }
1165
1166 static void acm_read_buffers_free(struct acm *acm)
1167 {
1168         int i;
1169
1170         for (i = 0; i < acm->rx_buflimit; i++)
1171                 usb_free_coherent(acm->dev, acm->readsize,
1172                           acm->read_buffers[i].base, acm->read_buffers[i].dma);
1173 }
1174
1175 /* Little helper: write buffers allocate */
1176 static int acm_write_buffers_alloc(struct acm *acm)
1177 {
1178         int i;
1179         struct acm_wb *wb;
1180
1181         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1182                 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1183                     &wb->dmah);
1184                 if (!wb->buf) {
1185                         while (i != 0) {
1186                                 --i;
1187                                 --wb;
1188                                 usb_free_coherent(acm->dev, acm->writesize,
1189                                     wb->buf, wb->dmah);
1190                         }
1191                         return -ENOMEM;
1192                 }
1193         }
1194         return 0;
1195 }
1196
1197 static int acm_probe(struct usb_interface *intf,
1198                      const struct usb_device_id *id)
1199 {
1200         struct usb_cdc_union_desc *union_header = NULL;
1201         struct usb_cdc_call_mgmt_descriptor *cmgmd = NULL;
1202         unsigned char *buffer = intf->altsetting->extra;
1203         int buflen = intf->altsetting->extralen;
1204         struct usb_interface *control_interface;
1205         struct usb_interface *data_interface;
1206         struct usb_endpoint_descriptor *epctrl = NULL;
1207         struct usb_endpoint_descriptor *epread = NULL;
1208         struct usb_endpoint_descriptor *epwrite = NULL;
1209         struct usb_device *usb_dev = interface_to_usbdev(intf);
1210         struct usb_cdc_parsed_header h;
1211         struct acm *acm;
1212         int minor;
1213         int ctrlsize, readsize;
1214         u8 *buf;
1215         int call_intf_num = -1;
1216         int data_intf_num = -1;
1217         unsigned long quirks;
1218         int num_rx_buf;
1219         int i;
1220         int combined_interfaces = 0;
1221         struct device *tty_dev;
1222         int rv = -ENOMEM;
1223         int res;
1224
1225         /* normal quirks */
1226         quirks = (unsigned long)id->driver_info;
1227
1228         if (quirks == IGNORE_DEVICE)
1229                 return -ENODEV;
1230
1231         memset(&h, 0x00, sizeof(struct usb_cdc_parsed_header));
1232
1233         num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1234
1235         /* handle quirks deadly to normal probing*/
1236         if (quirks == NO_UNION_NORMAL) {
1237                 data_interface = usb_ifnum_to_if(usb_dev, 1);
1238                 control_interface = usb_ifnum_to_if(usb_dev, 0);
1239                 /* we would crash */
1240                 if (!data_interface || !control_interface)
1241                         return -ENODEV;
1242                 goto skip_normal_probe;
1243         }
1244
1245         /* normal probing*/
1246         if (!buffer) {
1247                 dev_err(&intf->dev, "Weird descriptor references\n");
1248                 return -EINVAL;
1249         }
1250
1251         if (!intf->cur_altsetting)
1252                 return -EINVAL;
1253
1254         if (!buflen) {
1255                 if (intf->cur_altsetting->endpoint &&
1256                                 intf->cur_altsetting->endpoint->extralen &&
1257                                 intf->cur_altsetting->endpoint->extra) {
1258                         dev_dbg(&intf->dev,
1259                                 "Seeking extra descriptors on endpoint\n");
1260                         buflen = intf->cur_altsetting->endpoint->extralen;
1261                         buffer = intf->cur_altsetting->endpoint->extra;
1262                 } else {
1263                         dev_err(&intf->dev,
1264                                 "Zero length descriptor references\n");
1265                         return -EINVAL;
1266                 }
1267         }
1268
1269         cdc_parse_cdc_header(&h, intf, buffer, buflen);
1270         union_header = h.usb_cdc_union_desc;
1271         cmgmd = h.usb_cdc_call_mgmt_descriptor;
1272         if (cmgmd)
1273                 call_intf_num = cmgmd->bDataInterface;
1274
1275         if (!union_header) {
1276                 if (call_intf_num > 0) {
1277                         dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1278                         /* quirks for Droids MuIn LCD */
1279                         if (quirks & NO_DATA_INTERFACE) {
1280                                 data_interface = usb_ifnum_to_if(usb_dev, 0);
1281                         } else {
1282                                 data_intf_num = call_intf_num;
1283                                 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1284                         }
1285                         control_interface = intf;
1286                 } else {
1287                         if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1288                                 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1289                                 return -ENODEV;
1290                         } else {
1291                                 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1292                                 combined_interfaces = 1;
1293                                 control_interface = data_interface = intf;
1294                                 goto look_for_collapsed_interface;
1295                         }
1296                 }
1297         } else {
1298                 data_intf_num = union_header->bSlaveInterface0;
1299                 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1300                 data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
1301         }
1302
1303         if (!control_interface || !data_interface) {
1304                 dev_dbg(&intf->dev, "no interfaces\n");
1305                 return -ENODEV;
1306         }
1307         if (!data_interface->cur_altsetting || !control_interface->cur_altsetting)
1308                 return -ENODEV;
1309
1310         if (data_intf_num != call_intf_num)
1311                 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1312
1313         if (control_interface == data_interface) {
1314                 /* some broken devices designed for windows work this way */
1315                 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1316                 combined_interfaces = 1;
1317                 /* a popular other OS doesn't use it */
1318                 quirks |= NO_CAP_LINE;
1319                 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1320                         dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1321                         return -EINVAL;
1322                 }
1323 look_for_collapsed_interface:
1324                 res = usb_find_common_endpoints(data_interface->cur_altsetting,
1325                                 &epread, &epwrite, &epctrl, NULL);
1326                 if (res)
1327                         return res;
1328
1329                 goto made_compressed_probe;
1330         }
1331
1332 skip_normal_probe:
1333
1334         /*workaround for switched interfaces */
1335         if (data_interface->cur_altsetting->desc.bInterfaceClass
1336                                                 != CDC_DATA_INTERFACE_TYPE) {
1337                 if (control_interface->cur_altsetting->desc.bInterfaceClass
1338                                                 == CDC_DATA_INTERFACE_TYPE) {
1339                         dev_dbg(&intf->dev,
1340                                 "Your device has switched interfaces.\n");
1341                         swap(control_interface, data_interface);
1342                 } else {
1343                         return -EINVAL;
1344                 }
1345         }
1346
1347         /* Accept probe requests only for the control interface */
1348         if (!combined_interfaces && intf != control_interface)
1349                 return -ENODEV;
1350
1351         if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1352                 /* valid in this context */
1353                 dev_dbg(&intf->dev, "The data interface isn't available\n");
1354                 return -EBUSY;
1355         }
1356
1357
1358         if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1359             control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1360                 return -EINVAL;
1361
1362         epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1363         epread = &data_interface->cur_altsetting->endpoint[0].desc;
1364         epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1365
1366
1367         /* workaround for switched endpoints */
1368         if (!usb_endpoint_dir_in(epread)) {
1369                 /* descriptors are swapped */
1370                 dev_dbg(&intf->dev,
1371                         "The data interface has switched endpoints\n");
1372                 swap(epread, epwrite);
1373         }
1374 made_compressed_probe:
1375         dev_dbg(&intf->dev, "interfaces are valid\n");
1376
1377         acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1378         if (acm == NULL)
1379                 goto alloc_fail;
1380
1381         minor = acm_alloc_minor(acm);
1382         if (minor < 0)
1383                 goto alloc_fail1;
1384
1385         ctrlsize = usb_endpoint_maxp(epctrl);
1386         readsize = usb_endpoint_maxp(epread) *
1387                                 (quirks == SINGLE_RX_URB ? 1 : 2);
1388         acm->combined_interfaces = combined_interfaces;
1389         acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1390         acm->control = control_interface;
1391         acm->data = data_interface;
1392         acm->minor = minor;
1393         acm->dev = usb_dev;
1394         if (h.usb_cdc_acm_descriptor)
1395                 acm->ctrl_caps = h.usb_cdc_acm_descriptor->bmCapabilities;
1396         if (quirks & NO_CAP_LINE)
1397                 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1398         acm->ctrlsize = ctrlsize;
1399         acm->readsize = readsize;
1400         acm->rx_buflimit = num_rx_buf;
1401         INIT_WORK(&acm->work, acm_softint);
1402         init_waitqueue_head(&acm->wioctl);
1403         spin_lock_init(&acm->write_lock);
1404         spin_lock_init(&acm->read_lock);
1405         mutex_init(&acm->mutex);
1406         if (usb_endpoint_xfer_int(epread)) {
1407                 acm->bInterval = epread->bInterval;
1408                 acm->in = usb_rcvintpipe(usb_dev, epread->bEndpointAddress);
1409         } else {
1410                 acm->in = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1411         }
1412         if (usb_endpoint_xfer_int(epwrite))
1413                 acm->out = usb_sndintpipe(usb_dev, epwrite->bEndpointAddress);
1414         else
1415                 acm->out = usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress);
1416         tty_port_init(&acm->port);
1417         acm->port.ops = &acm_port_ops;
1418         init_usb_anchor(&acm->delayed);
1419         acm->quirks = quirks;
1420
1421         buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1422         if (!buf)
1423                 goto alloc_fail2;
1424         acm->ctrl_buffer = buf;
1425
1426         if (acm_write_buffers_alloc(acm) < 0)
1427                 goto alloc_fail4;
1428
1429         acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1430         if (!acm->ctrlurb)
1431                 goto alloc_fail5;
1432
1433         for (i = 0; i < num_rx_buf; i++) {
1434                 struct acm_rb *rb = &(acm->read_buffers[i]);
1435                 struct urb *urb;
1436
1437                 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1438                                                                 &rb->dma);
1439                 if (!rb->base)
1440                         goto alloc_fail6;
1441                 rb->index = i;
1442                 rb->instance = acm;
1443
1444                 urb = usb_alloc_urb(0, GFP_KERNEL);
1445                 if (!urb)
1446                         goto alloc_fail6;
1447
1448                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1449                 urb->transfer_dma = rb->dma;
1450                 if (usb_endpoint_xfer_int(epread))
1451                         usb_fill_int_urb(urb, acm->dev, acm->in, rb->base,
1452                                          acm->readsize,
1453                                          acm_read_bulk_callback, rb,
1454                                          acm->bInterval);
1455                 else
1456                         usb_fill_bulk_urb(urb, acm->dev, acm->in, rb->base,
1457                                           acm->readsize,
1458                                           acm_read_bulk_callback, rb);
1459
1460                 acm->read_urbs[i] = urb;
1461                 __set_bit(i, &acm->read_urbs_free);
1462         }
1463         for (i = 0; i < ACM_NW; i++) {
1464                 struct acm_wb *snd = &(acm->wb[i]);
1465
1466                 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1467                 if (snd->urb == NULL)
1468                         goto alloc_fail7;
1469
1470                 if (usb_endpoint_xfer_int(epwrite))
1471                         usb_fill_int_urb(snd->urb, usb_dev, acm->out,
1472                                 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1473                 else
1474                         usb_fill_bulk_urb(snd->urb, usb_dev, acm->out,
1475                                 NULL, acm->writesize, acm_write_bulk, snd);
1476                 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1477                 if (quirks & SEND_ZERO_PACKET)
1478                         snd->urb->transfer_flags |= URB_ZERO_PACKET;
1479                 snd->instance = acm;
1480         }
1481
1482         usb_set_intfdata(intf, acm);
1483
1484         i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1485         if (i < 0)
1486                 goto alloc_fail7;
1487
1488         if (h.usb_cdc_country_functional_desc) { /* export the country data */
1489                 struct usb_cdc_country_functional_desc * cfd =
1490                                         h.usb_cdc_country_functional_desc;
1491
1492                 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1493                 if (!acm->country_codes)
1494                         goto skip_countries;
1495                 acm->country_code_size = cfd->bLength - 4;
1496                 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1497                                                         cfd->bLength - 4);
1498                 acm->country_rel_date = cfd->iCountryCodeRelDate;
1499
1500                 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1501                 if (i < 0) {
1502                         kfree(acm->country_codes);
1503                         acm->country_codes = NULL;
1504                         acm->country_code_size = 0;
1505                         goto skip_countries;
1506                 }
1507
1508                 i = device_create_file(&intf->dev,
1509                                                 &dev_attr_iCountryCodeRelDate);
1510                 if (i < 0) {
1511                         device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1512                         kfree(acm->country_codes);
1513                         acm->country_codes = NULL;
1514                         acm->country_code_size = 0;
1515                         goto skip_countries;
1516                 }
1517         }
1518
1519 skip_countries:
1520         usb_fill_int_urb(acm->ctrlurb, usb_dev,
1521                          usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1522                          acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1523                          /* works around buggy devices */
1524                          epctrl->bInterval ? epctrl->bInterval : 16);
1525         acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1526         acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1527         acm->notification_buffer = NULL;
1528         acm->nb_index = 0;
1529         acm->nb_size = 0;
1530
1531         dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1532
1533         acm->line.dwDTERate = cpu_to_le32(9600);
1534         acm->line.bDataBits = 8;
1535         acm_set_line(acm, &acm->line);
1536
1537         usb_driver_claim_interface(&acm_driver, data_interface, acm);
1538         usb_set_intfdata(data_interface, acm);
1539
1540         usb_get_intf(control_interface);
1541         tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1542                         &control_interface->dev);
1543         if (IS_ERR(tty_dev)) {
1544                 rv = PTR_ERR(tty_dev);
1545                 goto alloc_fail8;
1546         }
1547
1548         if (quirks & CLEAR_HALT_CONDITIONS) {
1549                 usb_clear_halt(usb_dev, acm->in);
1550                 usb_clear_halt(usb_dev, acm->out);
1551         }
1552
1553         return 0;
1554 alloc_fail8:
1555         if (acm->country_codes) {
1556                 device_remove_file(&acm->control->dev,
1557                                 &dev_attr_wCountryCodes);
1558                 device_remove_file(&acm->control->dev,
1559                                 &dev_attr_iCountryCodeRelDate);
1560                 kfree(acm->country_codes);
1561         }
1562         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1563 alloc_fail7:
1564         usb_set_intfdata(intf, NULL);
1565         for (i = 0; i < ACM_NW; i++)
1566                 usb_free_urb(acm->wb[i].urb);
1567 alloc_fail6:
1568         for (i = 0; i < num_rx_buf; i++)
1569                 usb_free_urb(acm->read_urbs[i]);
1570         acm_read_buffers_free(acm);
1571         usb_free_urb(acm->ctrlurb);
1572 alloc_fail5:
1573         acm_write_buffers_free(acm);
1574 alloc_fail4:
1575         usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1576 alloc_fail2:
1577         acm_release_minor(acm);
1578 alloc_fail1:
1579         kfree(acm);
1580 alloc_fail:
1581         return rv;
1582 }
1583
1584 static void acm_disconnect(struct usb_interface *intf)
1585 {
1586         struct acm *acm = usb_get_intfdata(intf);
1587         struct tty_struct *tty;
1588
1589         /* sibling interface is already cleaning up */
1590         if (!acm)
1591                 return;
1592
1593         mutex_lock(&acm->mutex);
1594         acm->disconnected = true;
1595         if (acm->country_codes) {
1596                 device_remove_file(&acm->control->dev,
1597                                 &dev_attr_wCountryCodes);
1598                 device_remove_file(&acm->control->dev,
1599                                 &dev_attr_iCountryCodeRelDate);
1600         }
1601         wake_up_all(&acm->wioctl);
1602         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1603         usb_set_intfdata(acm->control, NULL);
1604         usb_set_intfdata(acm->data, NULL);
1605         mutex_unlock(&acm->mutex);
1606
1607         tty = tty_port_tty_get(&acm->port);
1608         if (tty) {
1609                 tty_vhangup(tty);
1610                 tty_kref_put(tty);
1611         }
1612
1613         acm_kill_urbs(acm);
1614         cancel_work_sync(&acm->work);
1615
1616         tty_unregister_device(acm_tty_driver, acm->minor);
1617
1618         acm_write_buffers_free(acm);
1619         usb_free_coherent(acm->dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1620         acm_read_buffers_free(acm);
1621
1622         kfree(acm->notification_buffer);
1623
1624         if (!acm->combined_interfaces)
1625                 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1626                                         acm->data : acm->control);
1627
1628         tty_port_put(&acm->port);
1629 }
1630
1631 #ifdef CONFIG_PM
1632 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1633 {
1634         struct acm *acm = usb_get_intfdata(intf);
1635         int cnt;
1636
1637         spin_lock_irq(&acm->write_lock);
1638         if (PMSG_IS_AUTO(message)) {
1639                 if (acm->transmitting) {
1640                         spin_unlock_irq(&acm->write_lock);
1641                         return -EBUSY;
1642                 }
1643         }
1644         cnt = acm->susp_count++;
1645         spin_unlock_irq(&acm->write_lock);
1646
1647         if (cnt)
1648                 return 0;
1649
1650         acm_kill_urbs(acm);
1651         cancel_work_sync(&acm->work);
1652
1653         return 0;
1654 }
1655
1656 static int acm_resume(struct usb_interface *intf)
1657 {
1658         struct acm *acm = usb_get_intfdata(intf);
1659         struct urb *urb;
1660         int rv = 0;
1661
1662         spin_lock_irq(&acm->write_lock);
1663
1664         if (--acm->susp_count)
1665                 goto out;
1666
1667         if (tty_port_initialized(&acm->port)) {
1668                 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1669
1670                 for (;;) {
1671                         urb = usb_get_from_anchor(&acm->delayed);
1672                         if (!urb)
1673                                 break;
1674
1675                         acm_start_wb(acm, urb->context);
1676                 }
1677
1678                 /*
1679                  * delayed error checking because we must
1680                  * do the write path at all cost
1681                  */
1682                 if (rv < 0)
1683                         goto out;
1684
1685                 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1686         }
1687 out:
1688         spin_unlock_irq(&acm->write_lock);
1689
1690         return rv;
1691 }
1692
1693 static int acm_reset_resume(struct usb_interface *intf)
1694 {
1695         struct acm *acm = usb_get_intfdata(intf);
1696
1697         if (tty_port_initialized(&acm->port))
1698                 tty_port_tty_hangup(&acm->port, false);
1699
1700         return acm_resume(intf);
1701 }
1702
1703 #endif /* CONFIG_PM */
1704
1705 static int acm_pre_reset(struct usb_interface *intf)
1706 {
1707         struct acm *acm = usb_get_intfdata(intf);
1708
1709         clear_bit(EVENT_RX_STALL, &acm->flags);
1710
1711         return 0;
1712 }
1713
1714 #define NOKIA_PCSUITE_ACM_INFO(x) \
1715                 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1716                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1717                 USB_CDC_ACM_PROTO_VENDOR)
1718
1719 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1720                 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1721                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1722                 USB_CDC_ACM_PROTO_VENDOR)
1723
1724 /*
1725  * USB driver structure.
1726  */
1727
1728 static const struct usb_device_id acm_ids[] = {
1729         /* quirky and broken devices */
1730         { USB_DEVICE(0x076d, 0x0006), /* Denso Cradle CU-321 */
1731         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1732         { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1733         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1734         { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1735         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1736         },
1737         { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1738         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1739         },
1740         { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1741         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1742         },
1743         { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1744         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1745         },
1746         { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1747         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1748         },
1749         { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1750         .driver_info = SINGLE_RX_URB,
1751         },
1752         { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1753         .driver_info = SINGLE_RX_URB, /* firmware bug */
1754         },
1755         { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1756         .driver_info = SINGLE_RX_URB, /* firmware bug */
1757         },
1758         { USB_DEVICE(0x11ca, 0x0201), /* VeriFone Mx870 Gadget Serial */
1759         .driver_info = SINGLE_RX_URB,
1760         },
1761         { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1762         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1763         },
1764         { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1765         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1766         },
1767         { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1768         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1769         },
1770         { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1771         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1772         },
1773         { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1774         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1775         },
1776         { USB_DEVICE(0x20df, 0x0001), /* Simtec Electronics Entropy Key */
1777         .driver_info = QUIRK_CONTROL_LINE_STATE, },
1778         { USB_DEVICE(0x2184, 0x001c) }, /* GW Instek AFG-2225 */
1779         { USB_DEVICE(0x2184, 0x0036) }, /* GW Instek AFG-125 */
1780         { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1781         },
1782         /* Motorola H24 HSPA module: */
1783         { USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1784         { USB_DEVICE(0x22b8, 0x2d92),   /* modem           + diagnostics        */
1785         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1786         },
1787         { USB_DEVICE(0x22b8, 0x2d93),   /* modem + AT port                      */
1788         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1789         },
1790         { USB_DEVICE(0x22b8, 0x2d95),   /* modem + AT port + diagnostics        */
1791         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1792         },
1793         { USB_DEVICE(0x22b8, 0x2d96),   /* modem                         + NMEA */
1794         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1795         },
1796         { USB_DEVICE(0x22b8, 0x2d97),   /* modem           + diagnostics + NMEA */
1797         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1798         },
1799         { USB_DEVICE(0x22b8, 0x2d99),   /* modem + AT port               + NMEA */
1800         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1801         },
1802         { USB_DEVICE(0x22b8, 0x2d9a),   /* modem + AT port + diagnostics + NMEA */
1803         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1804         },
1805
1806         { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1807         .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1808                                            data interface instead of
1809                                            communications interface.
1810                                            Maybe we should define a new
1811                                            quirk for this. */
1812         },
1813         { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1814         .driver_info = NO_UNION_NORMAL,
1815         },
1816         { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1817         .driver_info = NO_UNION_NORMAL,
1818         },
1819         { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1820         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1821         },
1822         { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1823         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1824         },
1825         { USB_DEVICE(0xfff0, 0x0100), /* DATECS FP-2000 */
1826         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1827         },
1828         { USB_DEVICE(0x09d8, 0x0320), /* Elatec GmbH TWN3 */
1829         .driver_info = NO_UNION_NORMAL, /* has misplaced union descriptor */
1830         },
1831
1832         { USB_DEVICE(0x2912, 0x0001), /* ATOL FPrint */
1833         .driver_info = CLEAR_HALT_CONDITIONS,
1834         },
1835
1836         /* Nokia S60 phones expose two ACM channels. The first is
1837          * a modem and is picked up by the standard AT-command
1838          * information below. The second is 'vendor-specific' but
1839          * is treated as a serial device at the S60 end, so we want
1840          * to expose it on Linux too. */
1841         { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1842         { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1843         { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1844         { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1845         { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1846         { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1847         { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1848         { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1849         { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1850         { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1851         { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1852         { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1853         { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1854         { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1855         { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1856         { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1857         { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1858         { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1859         { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1860         { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1861         { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1862         { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1863         { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1864         { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1865         { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1866         { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1867         { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1868         { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1869         { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1870         { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1871         { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1872         { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
1873         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1874         { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1875         { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1876         { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1877         { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1878         { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1879         { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1880         { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1881         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1882         { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1883         { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1884         { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1885         { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1886         { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1887         { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1888         { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1889         { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1890         { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1891         { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1892         { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1893         { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1894         { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1895         { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1896         { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1897         { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1898         { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1899
1900         /* Support for Owen devices */
1901         { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1902
1903         /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1904
1905         /* Support for Droids MuIn LCD */
1906         { USB_DEVICE(0x04d8, 0x000b),
1907         .driver_info = NO_DATA_INTERFACE,
1908         },
1909
1910 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1911         { USB_DEVICE(0x04d8, 0x0082),   /* Application mode */
1912         .driver_info = IGNORE_DEVICE,
1913         },
1914         { USB_DEVICE(0x04d8, 0x0083),   /* Bootloader mode */
1915         .driver_info = IGNORE_DEVICE,
1916         },
1917 #endif
1918
1919         /*Samsung phone in firmware update mode */
1920         { USB_DEVICE(0x04e8, 0x685d),
1921         .driver_info = IGNORE_DEVICE,
1922         },
1923
1924         /* Exclude Infineon Flash Loader utility */
1925         { USB_DEVICE(0x058b, 0x0041),
1926         .driver_info = IGNORE_DEVICE,
1927         },
1928
1929         /* control interfaces without any protocol set */
1930         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1931                 USB_CDC_PROTO_NONE) },
1932
1933         /* control interfaces with various AT-command sets */
1934         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1935                 USB_CDC_ACM_PROTO_AT_V25TER) },
1936         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1937                 USB_CDC_ACM_PROTO_AT_PCCA101) },
1938         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1939                 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1940         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1941                 USB_CDC_ACM_PROTO_AT_GSM) },
1942         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1943                 USB_CDC_ACM_PROTO_AT_3G) },
1944         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1945                 USB_CDC_ACM_PROTO_AT_CDMA) },
1946
1947         { USB_DEVICE(0x1519, 0x0452), /* Intel 7260 modem */
1948         .driver_info = SEND_ZERO_PACKET,
1949         },
1950
1951         { }
1952 };
1953
1954 MODULE_DEVICE_TABLE(usb, acm_ids);
1955
1956 static struct usb_driver acm_driver = {
1957         .name =         "cdc_acm",
1958         .probe =        acm_probe,
1959         .disconnect =   acm_disconnect,
1960 #ifdef CONFIG_PM
1961         .suspend =      acm_suspend,
1962         .resume =       acm_resume,
1963         .reset_resume = acm_reset_resume,
1964 #endif
1965         .pre_reset =    acm_pre_reset,
1966         .id_table =     acm_ids,
1967 #ifdef CONFIG_PM
1968         .supports_autosuspend = 1,
1969 #endif
1970         .disable_hub_initiated_lpm = 1,
1971 };
1972
1973 /*
1974  * TTY driver structures.
1975  */
1976
1977 static const struct tty_operations acm_ops = {
1978         .install =              acm_tty_install,
1979         .open =                 acm_tty_open,
1980         .close =                acm_tty_close,
1981         .cleanup =              acm_tty_cleanup,
1982         .hangup =               acm_tty_hangup,
1983         .write =                acm_tty_write,
1984         .put_char =             acm_tty_put_char,
1985         .flush_chars =          acm_tty_flush_chars,
1986         .write_room =           acm_tty_write_room,
1987         .ioctl =                acm_tty_ioctl,
1988         .throttle =             acm_tty_throttle,
1989         .unthrottle =           acm_tty_unthrottle,
1990         .chars_in_buffer =      acm_tty_chars_in_buffer,
1991         .break_ctl =            acm_tty_break_ctl,
1992         .set_termios =          acm_tty_set_termios,
1993         .tiocmget =             acm_tty_tiocmget,
1994         .tiocmset =             acm_tty_tiocmset,
1995         .get_icount =           acm_tty_get_icount,
1996 };
1997
1998 /*
1999  * Init / exit.
2000  */
2001
2002 static int __init acm_init(void)
2003 {
2004         int retval;
2005         acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
2006         if (!acm_tty_driver)
2007                 return -ENOMEM;
2008         acm_tty_driver->driver_name = "acm",
2009         acm_tty_driver->name = "ttyACM",
2010         acm_tty_driver->major = ACM_TTY_MAJOR,
2011         acm_tty_driver->minor_start = 0,
2012         acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
2013         acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
2014         acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
2015         acm_tty_driver->init_termios = tty_std_termios;
2016         acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
2017                                                                 HUPCL | CLOCAL;
2018         tty_set_operations(acm_tty_driver, &acm_ops);
2019
2020         retval = tty_register_driver(acm_tty_driver);
2021         if (retval) {
2022                 put_tty_driver(acm_tty_driver);
2023                 return retval;
2024         }
2025
2026         retval = usb_register(&acm_driver);
2027         if (retval) {
2028                 tty_unregister_driver(acm_tty_driver);
2029                 put_tty_driver(acm_tty_driver);
2030                 return retval;
2031         }
2032
2033         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
2034
2035         return 0;
2036 }
2037
2038 static void __exit acm_exit(void)
2039 {
2040         usb_deregister(&acm_driver);
2041         tty_unregister_driver(acm_tty_driver);
2042         put_tty_driver(acm_tty_driver);
2043         idr_destroy(&acm_minors);
2044 }
2045
2046 module_init(acm_init);
2047 module_exit(acm_exit);
2048
2049 MODULE_AUTHOR(DRIVER_AUTHOR);
2050 MODULE_DESCRIPTION(DRIVER_DESC);
2051 MODULE_LICENSE("GPL");
2052 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);