drivers/usb/class/cdc-acm.c

   1 /*
   2  * cdc-acm.c
   3  *
   4  * Copyright (c) 1999 Armin Fuerst      <fuerst@in.tum.de>
   5  * Copyright (c) 1999 Pavel Machek      <pavel@ucw.cz>
   6  * Copyright (c) 1999 Johannes Erdfelt  <johannes@erdfelt.com>
   7  * Copyright (c) 2000 Vojtech Pavlik    <vojtech@suse.cz>
   8  * Copyright (c) 2004 Oliver Neukum     <oliver@neukum.name>
   9  * Copyright (c) 2005 David Kubicek     <dave@awk.cz>
  10  * Copyright (c) 2011 Johan Hovold      <jhovold@gmail.com>
  11  *
  12  * USB Abstract Control Model driver for USB modems and ISDN adapters
  13  *
  14  * Sponsored by SuSE
  15  *
  16  * This program is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License as published by
  18  * the Free Software Foundation; either version 2 of the License, or
  19  * (at your option) any later version.
  20  *
  21  * This program is distributed in the hope that it will be useful,
  22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  * GNU General Public License for more details.
  25  *
  26  * You should have received a copy of the GNU General Public License
  27  * along with this program; if not, write to the Free Software
  28  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  29  */
  30
  31 #undef DEBUG
  32 #undef VERBOSE_DEBUG
  33
  34 #include <linux/kernel.h>
  35 #include <linux/errno.h>
  36 #include <linux/init.h>
  37 #include <linux/slab.h>
  38 #include <linux/tty.h>
  39 #include <linux/serial.h>
  40 #include <linux/tty_driver.h>
  41 #include <linux/tty_flip.h>
  42 #include <linux/module.h>
  43 #include <linux/mutex.h>
  44 #include <linux/uaccess.h>
  45 #include <linux/usb.h>
  46 #include <linux/usb/cdc.h>
  47 #include <asm/byteorder.h>
  48 #include <asm/unaligned.h>
  49 #include <linux/list.h>
  50
  51 #include "cdc-acm.h"
  52
  53
  54 #define DRIVER_AUTHOR "Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik, David Kubicek, Johan Hovold"
  55 #define DRIVER_DESC "USB Abstract Control Model driver for USB modems and ISDN adapters"
  56
  57 static struct usb_driver acm_driver;
  58 static struct tty_driver *acm_tty_driver;
  59 static struct acm *acm_table[ACM_TTY_MINORS];
  60
  61 static DEFINE_MUTEX(acm_table_lock);
  62
  63 /*
  64  * acm_table accessors
  65  */
  66
  67 /*
  68  * Look up an ACM structure by index. If found and not disconnected, increment
  69  * its refcount and return it with its mutex held.
  70  */
  71 static struct acm *acm_get_by_index(unsigned index)
  72 {
  73         struct acm *acm;
  74
  75         mutex_lock(&acm_table_lock);
  76         acm = acm_table[index];
  77         if (acm) {
  78                 mutex_lock(&acm->mutex);
  79                 if (acm->disconnected) {
  80                         mutex_unlock(&acm->mutex);
  81                         acm = NULL;
  82                 } else {
  83                         tty_port_get(&acm->port);
  84                         mutex_unlock(&acm->mutex);
  85                 }
  86         }
  87         mutex_unlock(&acm_table_lock);
  88         return acm;
  89 }
  90
  91 /*
  92  * Try to find an available minor number and if found, associate it with 'acm'.
  93  */
  94 static int acm_alloc_minor(struct acm *acm)
  95 {
  96         int minor;
  97
  98         mutex_lock(&acm_table_lock);
  99         for (minor = 0; minor < ACM_TTY_MINORS; minor++) {
 100                 if (!acm_table[minor]) {
 101                         acm_table[minor] = acm;
 102                         break;
 103                 }
 104         }
 105         mutex_unlock(&acm_table_lock);
 106
 107         return minor;
 108 }
 109
 110 /* Release the minor number associated with 'acm'.  */
 111 static void acm_release_minor(struct acm *acm)
 112 {
 113         mutex_lock(&acm_table_lock);
 114         acm_table[acm->minor] = NULL;
 115         mutex_unlock(&acm_table_lock);
 116 }
 117
 118 /*
 119  * Functions for ACM control messages.
 120  */
 121
 122 static int acm_ctrl_msg(struct acm *acm, int request, int value,
 123                                                         void *buf, int len)
 124 {
 125         int retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
 126                 request, USB_RT_ACM, value,
 127                 acm->control->altsetting[0].desc.bInterfaceNumber,
 128                 buf, len, 5000);
 129         dev_dbg(&acm->control->dev,
 130                         "%s - rq 0x%02x, val %#x, len %#x, result %d\n",
 131                         __func__, request, value, len, retval);
 132         return retval < 0 ? retval : 0;
 133 }
 134
 135 /* devices aren't required to support these requests.
 136  * the cdc acm descriptor tells whether they do...
 137  */
 138 #define acm_set_control(acm, control) \
 139         acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE, control, NULL, 0)
 140 #define acm_set_line(acm, line) \
 141         acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
 142 #define acm_send_break(acm, ms) \
 143         acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)
 144
 145 /*
 146  * Write buffer management.
 147  * All of these assume proper locks taken by the caller.
 148  */
 149
 150 static int acm_wb_alloc(struct acm *acm)
 151 {
 152         int i, wbn;
 153         struct acm_wb *wb;
 154
 155         wbn = 0;
 156         i = 0;
 157         for (;;) {
 158                 wb = &acm->wb[wbn];
 159                 if (!wb->use) {
 160                         wb->use = 1;
 161                         return wbn;
 162                 }
 163                 wbn = (wbn + 1) % ACM_NW;
 164                 if (++i >= ACM_NW)
 165                         return -1;
 166         }
 167 }
 168
 169 static int acm_wb_is_avail(struct acm *acm)
 170 {
 171         int i, n;
 172         unsigned long flags;
 173
 174         n = ACM_NW;
 175         spin_lock_irqsave(&acm->write_lock, flags);
 176         for (i = 0; i < ACM_NW; i++)
 177                 n -= acm->wb[i].use;
 178         spin_unlock_irqrestore(&acm->write_lock, flags);
 179         return n;
 180 }
 181
 182 /*
 183  * Finish write. Caller must hold acm->write_lock
 184  */
 185 static void acm_write_done(struct acm *acm, struct acm_wb *wb)
 186 {
 187         wb->use = 0;
 188         acm->transmitting--;
 189         usb_autopm_put_interface_async(acm->control);
 190 }
 191
 192 /*
 193  * Poke write.
 194  *
 195  * the caller is responsible for locking
 196  */
 197
 198 static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
 199 {
 200         int rc;
 201
 202         acm->transmitting++;
 203
 204         wb->urb->transfer_buffer = wb->buf;
 205         wb->urb->transfer_dma = wb->dmah;
 206         wb->urb->transfer_buffer_length = wb->len;
 207         wb->urb->dev = acm->dev;
 208         rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
 209         if (rc < 0) {
 210                 dev_err(&acm->data->dev,
 211                         "%s - usb_submit_urb(write bulk) failed: %d\n",
 212                         __func__, rc);
 213                 acm_write_done(acm, wb);
 214         }
 215         return rc;
 216 }
 217
 218 static int acm_write_start(struct acm *acm, int wbn)
 219 {
 220         unsigned long flags;
 221         struct acm_wb *wb = &acm->wb[wbn];
 222         int rc;
 223 #ifdef CONFIG_PM
 224         struct urb *res;
 225 #endif
 226
 227         spin_lock_irqsave(&acm->write_lock, flags);
 228         if (!acm->dev) {
 229                 wb->use = 0;
 230                 spin_unlock_irqrestore(&acm->write_lock, flags);
 231                 return -ENODEV;
 232         }
 233
 234         dev_vdbg(&acm->data->dev, "%s - susp_count %d\n", __func__,
 235                                                         acm->susp_count);
 236         usb_autopm_get_interface_async(acm->control);
 237         if (acm->susp_count) {
 238 #ifdef CONFIG_PM
 239                 acm->transmitting++;
 240                 wb->urb->transfer_buffer = wb->buf;
 241                 wb->urb->transfer_dma = wb->dmah;
 242                 wb->urb->transfer_buffer_length = wb->len;
 243                 wb->urb->dev = acm->dev;
 244                 usb_anchor_urb(wb->urb, &acm->deferred);
 245 #else
 246                 if (!acm->delayed_wb)
 247                         acm->delayed_wb = wb;
 248                 else
 249                         usb_autopm_put_interface_async(acm->control);
 250 #endif
 251                 spin_unlock_irqrestore(&acm->write_lock, flags);
 252                 return 0;       /* A white lie */
 253         }
 254         usb_mark_last_busy(acm->dev);
 255 #ifdef CONFIG_PM
 256         while ((res = usb_get_from_anchor(&acm->deferred))) {
 257                 /* decrement ref count*/
 258                 usb_put_urb(res);
 259                 rc = usb_submit_urb(res, GFP_ATOMIC);
 260                 if (rc < 0) {
 261                         dev_dbg(&acm->data->dev,
 262                                 "usb_submit_urb(pending request) failed: %d",
 263                                 rc);
 264                         usb_unanchor_urb(res);
 265                         acm_write_done(acm, res->context);
 266                 }
 267         }
 268 #endif
 269         rc = acm_start_wb(acm, wb);
 270         spin_unlock_irqrestore(&acm->write_lock, flags);
 271
 272         return rc;
 273
 274 }
 275 /*
 276  * attributes exported through sysfs
 277  */
 278 static ssize_t show_caps
 279 (struct device *dev, struct device_attribute *attr, char *buf)
 280 {
 281         struct usb_interface *intf = to_usb_interface(dev);
 282         struct acm *acm = usb_get_intfdata(intf);
 283
 284         return sprintf(buf, "%d", acm->ctrl_caps);
 285 }
 286 static DEVICE_ATTR(bmCapabilities, S_IRUGO, show_caps, NULL);
 287
 288 static ssize_t show_country_codes
 289 (struct device *dev, struct device_attribute *attr, char *buf)
 290 {
 291         struct usb_interface *intf = to_usb_interface(dev);
 292         struct acm *acm = usb_get_intfdata(intf);
 293
 294         memcpy(buf, acm->country_codes, acm->country_code_size);
 295         return acm->country_code_size;
 296 }
 297
 298 static DEVICE_ATTR(wCountryCodes, S_IRUGO, show_country_codes, NULL);
 299
 300 static ssize_t show_country_rel_date
 301 (struct device *dev, struct device_attribute *attr, char *buf)
 302 {
 303         struct usb_interface *intf = to_usb_interface(dev);
 304         struct acm *acm = usb_get_intfdata(intf);
 305
 306         return sprintf(buf, "%d", acm->country_rel_date);
 307 }
 308
 309 static DEVICE_ATTR(iCountryCodeRelDate, S_IRUGO, show_country_rel_date, NULL);
 310 /*
 311  * Interrupt handlers for various ACM device responses
 312  */
 313
 314 /* control interface reports status changes with "interrupt" transfers */
 315 static void acm_ctrl_irq(struct urb *urb)
 316 {
 317         struct acm *acm = urb->context;
 318         struct usb_cdc_notification *dr = urb->transfer_buffer;
 319         unsigned char *data;
 320         int newctrl;
 321         int retval;
 322         int status = urb->status;
 323
 324         switch (status) {
 325         case 0:
 326                 /* success */
 327                 break;
 328         case -ECONNRESET:
 329         case -ENOENT:
 330         case -ESHUTDOWN:
 331                 /* this urb is terminated, clean up */
 332                 dev_dbg(&acm->control->dev,
 333                                 "%s - urb shutting down with status: %d\n",
 334                                 __func__, status);
 335                 return;
 336         default:
 337                 dev_dbg(&acm->control->dev,
 338                                 "%s - nonzero urb status received: %d\n",
 339                                 __func__, status);
 340                 goto exit;
 341         }
 342
 343         usb_mark_last_busy(acm->dev);
 344
 345         data = (unsigned char *)(dr + 1);
 346         switch (dr->bNotificationType) {
 347         case USB_CDC_NOTIFY_NETWORK_CONNECTION:
 348                 dev_dbg(&acm->control->dev, "%s - network connection: %d\n",
 349                                                         __func__, dr->wValue);
 350                 break;
 351
 352         case USB_CDC_NOTIFY_SERIAL_STATE:
 353                 newctrl = get_unaligned_le16(data);
 354
 355                 if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
 356                         dev_dbg(&acm->control->dev, "%s - calling hangup\n",
 357                                         __func__);
 358                         tty_port_tty_hangup(&acm->port, false);
 359                 }
 360
 361                 acm->ctrlin = newctrl;
 362
 363                 dev_dbg(&acm->control->dev,
 364                         "%s - input control lines: dcd%c dsr%c break%c "
 365                         "ring%c framing%c parity%c overrun%c\n",
 366                         __func__,
 367                         acm->ctrlin & ACM_CTRL_DCD ? '+' : '-',
 368                         acm->ctrlin & ACM_CTRL_DSR ? '+' : '-',
 369                         acm->ctrlin & ACM_CTRL_BRK ? '+' : '-',
 370                         acm->ctrlin & ACM_CTRL_RI  ? '+' : '-',
 371                         acm->ctrlin & ACM_CTRL_FRAMING ? '+' : '-',
 372                         acm->ctrlin & ACM_CTRL_PARITY ? '+' : '-',
 373                         acm->ctrlin & ACM_CTRL_OVERRUN ? '+' : '-');
 374                         break;
 375
 376         default:
 377                 dev_dbg(&acm->control->dev,
 378                         "%s - unknown notification %d received: index %d "
 379                         "len %d data0 %d data1 %d\n",
 380                         __func__,
 381                         dr->bNotificationType, dr->wIndex,
 382                         dr->wLength, data[0], data[1]);
 383                 break;
 384         }
 385 exit:
 386         retval = usb_submit_urb(urb, GFP_ATOMIC);
 387         if (retval)
 388                 dev_err(&acm->control->dev, "%s - usb_submit_urb failed: %d\n",
 389                                                         __func__, retval);
 390 }
 391
 392 static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
 393 {
 394         int res;
 395
 396         if (!test_and_clear_bit(index, &acm->read_urbs_free))
 397                 return 0;
 398
 399         dev_vdbg(&acm->data->dev, "%s - urb %d\n", __func__, index);
 400
 401         res = usb_submit_urb(acm->read_urbs[index], mem_flags);
 402         if (res) {
 403                 if (res != -EPERM) {
 404                         dev_err(&acm->data->dev,
 405                                         "%s - usb_submit_urb failed: %d\n",
 406                                         __func__, res);
 407                 }
 408                 set_bit(index, &acm->read_urbs_free);
 409                 return res;
 410         }
 411
 412         return 0;
 413 }
 414
 415 static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
 416 {
 417         int res;
 418         int i;
 419
 420         for (i = 0; i < acm->rx_buflimit; ++i) {
 421                 res = acm_submit_read_urb(acm, i, mem_flags);
 422                 if (res)
 423                         return res;
 424         }
 425
 426         return 0;
 427 }
 428
 429 static void acm_process_read_urb(struct acm *acm, struct urb *urb)
 430 {
 431         struct acm_rb *rb = urb->context;
 432         unsigned long flags;
 433
 434         if (!urb->actual_length) {
 435                 set_bit(rb->index, &acm->read_urbs_free);
 436                 return;
 437         }
 438
 439         rb->data = (unsigned char *)urb->transfer_buffer;
 440         rb->alen = urb->actual_length;
 441         spin_lock_irqsave(&acm->read_lock, flags);
 442         if (!acm->int_throttled && !acm->throttled) {
 443                 int count = tty_insert_flip_string(&acm->port,
 444                         rb->data, rb->alen);
 445                 if (count != rb->alen) {
 446                         acm->int_throttled = 1;
 447                         rb->data += count;
 448                         rb->alen -= count;
 449                 }
 450         }
 451         if (!acm->int_throttled && !acm->throttled)
 452                 set_bit(rb->index, &acm->read_urbs_free);
 453         else
 454                 list_add_tail(&rb->rb_node, &acm->rb_head);
 455         spin_unlock_irqrestore(&acm->read_lock, flags);
 456
 457         tty_flip_buffer_push(&acm->port);
 458 }
 459
 460 static void acm_read_bulk_callback(struct urb *urb)
 461 {
 462         struct acm_rb *rb = urb->context;
 463         struct acm *acm = rb->instance;
 464         unsigned long flags;
 465
 466         dev_vdbg(&acm->data->dev, "%s - urb %d, len %d\n", __func__,
 467                                         rb->index, urb->actual_length);
 468
 469         if (!acm->dev) {
 470                 dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
 471                 set_bit(rb->index, &acm->read_urbs_free);
 472                 return;
 473         }
 474         usb_mark_last_busy(acm->dev);
 475
 476         if (urb->status && !urb->actual_length) {
 477                 dev_dbg(&acm->data->dev, "%s - non-zero urb status: %d\n",
 478                                                         __func__, urb->status);
 479                 set_bit(rb->index, &acm->read_urbs_free);
 480                 return;
 481         }
 482
 483         acm_process_read_urb(acm, urb);
 484
 485         /* throttle device if requested by tty */
 486         spin_lock_irqsave(&acm->read_lock, flags);
 487         acm->throttled = acm->throttle_req;
 488         if (!acm->int_throttled && !acm->throttled && !acm->susp_count) {
 489                 spin_unlock_irqrestore(&acm->read_lock, flags);
 490                 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
 491         } else {
 492                 spin_unlock_irqrestore(&acm->read_lock, flags);
 493         }
 494 }
 495
 496 /* data interface wrote those outgoing bytes */
 497 static void acm_write_bulk(struct urb *urb)
 498 {
 499         struct acm_wb *wb = urb->context;
 500         struct acm *acm = wb->instance;
 501         unsigned long flags;
 502
 503         if (urb->status || (urb->actual_length != urb->transfer_buffer_length))
 504                 dev_vdbg(&acm->data->dev, "%s - len %d/%d, status %d\n",
 505                         __func__,
 506                         urb->actual_length,
 507                         urb->transfer_buffer_length,
 508                         urb->status);
 509
 510         spin_lock_irqsave(&acm->write_lock, flags);
 511         acm_write_done(acm, wb);
 512         spin_unlock_irqrestore(&acm->write_lock, flags);
 513         schedule_work(&acm->work);
 514 }
 515
 516 static void acm_softint(struct work_struct *work)
 517 {
 518         struct acm *acm = container_of(work, struct acm, work);
 519
 520         dev_vdbg(&acm->data->dev, "%s\n", __func__);
 521
 522         tty_port_tty_wakeup(&acm->port);
 523 }
 524
 525 /*
 526  * TTY handlers
 527  */
 528
 529 static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
 530 {
 531         struct acm *acm;
 532         int retval;
 533
 534         dev_dbg(tty->dev, "%s\n", __func__);
 535
 536         acm = acm_get_by_index(tty->index);
 537         if (!acm)
 538                 return -ENODEV;
 539
 540         retval = tty_standard_install(driver, tty);
 541         if (retval)
 542                 goto error_init_termios;
 543
 544         tty->driver_data = acm;
 545
 546         return 0;
 547
 548 error_init_termios:
 549         tty_port_put(&acm->port);
 550         return retval;
 551 }
 552
 553 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
 554 {
 555         struct acm *acm = tty->driver_data;
 556
 557         dev_dbg(tty->dev, "%s\n", __func__);
 558
 559         return tty_port_open(&acm->port, tty, filp);
 560 }
 561
 562 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
 563 {
 564         struct acm *acm = container_of(port, struct acm, port);
 565         int retval = -ENODEV;
 566
 567         dev_dbg(&acm->control->dev, "%s\n", __func__);
 568
 569         mutex_lock(&acm->mutex);
 570         if (acm->disconnected)
 571                 goto disconnected;
 572
 573         retval = usb_autopm_get_interface(acm->control);
 574         if (retval)
 575                 goto error_get_interface;
 576
 577         /*
 578          * FIXME: Why do we need this? Allocating 64K of physically contiguous
 579          * memory is really nasty...
 580          */
 581         set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
 582         acm->control->needs_remote_wakeup = 1;
 583
 584         if (acm_submit_read_urbs(acm, GFP_KERNEL))
 585                 goto error_submit_urb;
 586
 587         acm->ctrlurb->dev = acm->dev;
 588         if (usb_submit_urb(acm->ctrlurb, GFP_KERNEL)) {
 589                 dev_err(&acm->control->dev,
 590                         "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
 591                 goto error_submit_urb;
 592         }
 593
 594         acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS;
 595         if (acm_set_control(acm, acm->ctrlout) < 0 &&
 596             (acm->ctrl_caps & USB_CDC_CAP_LINE))
 597                 goto error_set_control;
 598
 599         usb_autopm_put_interface(acm->control);
 600
 601         /*
 602          * Unthrottle device in case the TTY was closed while throttled.
 603          */
 604         spin_lock_irq(&acm->read_lock);
 605         acm->int_throttled = 0;
 606         acm->throttled = 0;
 607         acm->throttle_req = 0;
 608         while (!list_empty(&acm->rb_head)) {
 609                 struct acm_rb *rb = list_entry(acm->rb_head.next,
 610                         struct acm_rb, rb_node);
 611                 list_del(acm->rb_head.next);
 612                 set_bit(rb->index, &acm->read_urbs_free);
 613         }
 614         spin_unlock_irq(&acm->read_lock);
 615
 616         if (acm_submit_read_urbs(acm, GFP_KERNEL))
 617                 goto error_submit_read_urbs;
 618
 619         mutex_unlock(&acm->mutex);
 620
 621         return 0;
 622
 623 error_submit_read_urbs:
 624         acm->ctrlout = 0;
 625         acm_set_control(acm, acm->ctrlout);
 626 error_set_control:
 627         usb_kill_urb(acm->ctrlurb);
 628 error_submit_urb:
 629         usb_autopm_put_interface(acm->control);
 630 error_get_interface:
 631 disconnected:
 632         mutex_unlock(&acm->mutex);
 633         return retval;
 634 }
 635
 636 static void acm_port_destruct(struct tty_port *port)
 637 {
 638         struct acm *acm = container_of(port, struct acm, port);
 639
 640         dev_dbg(&acm->control->dev, "%s\n", __func__);
 641
 642         acm_release_minor(acm);
 643         usb_put_intf(acm->control);
 644         kfree(acm->country_codes);
 645         kfree(acm);
 646 }
 647
 648 static void acm_port_shutdown(struct tty_port *port)
 649 {
 650         struct acm *acm = container_of(port, struct acm, port);
 651         int i;
 652         int pm_err;
 653
 654         dev_dbg(&acm->control->dev, "%s\n", __func__);
 655
 656         mutex_lock(&acm->mutex);
 657         if (!acm->disconnected) {
 658                 pm_err = usb_autopm_get_interface(acm->control);
 659                 acm_set_control(acm, acm->ctrlout = 0);
 660                 usb_kill_urb(acm->ctrlurb);
 661                 for (i = 0; i < ACM_NW; i++)
 662                         usb_kill_urb(acm->wb[i].urb);
 663                 for (i = 0; i < acm->rx_buflimit; i++)
 664                         usb_kill_urb(acm->read_urbs[i]);
 665                 acm->control->needs_remote_wakeup = 0;
 666                 if (!pm_err)
 667                         usb_autopm_put_interface(acm->control);
 668         }
 669         mutex_unlock(&acm->mutex);
 670 }
 671
 672 static void acm_tty_cleanup(struct tty_struct *tty)
 673 {
 674         struct acm *acm = tty->driver_data;
 675         dev_dbg(&acm->control->dev, "%s\n", __func__);
 676         tty_port_put(&acm->port);
 677 }
 678
 679 static void acm_tty_hangup(struct tty_struct *tty)
 680 {
 681         struct acm *acm = tty->driver_data;
 682         dev_dbg(&acm->control->dev, "%s\n", __func__);
 683         tty_port_hangup(&acm->port);
 684 }
 685
 686 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
 687 {
 688         struct acm *acm = tty->driver_data;
 689         dev_dbg(&acm->control->dev, "%s\n", __func__);
 690         tty_port_close(&acm->port, tty, filp);
 691 }
 692
 693 static int acm_tty_write(struct tty_struct *tty,
 694                                         const unsigned char *buf, int count)
 695 {
 696         struct acm *acm = tty->driver_data;
 697         int stat;
 698         unsigned long flags;
 699         int wbn;
 700         struct acm_wb *wb;
 701
 702         if (!count)
 703                 return 0;
 704
 705         dev_vdbg(&acm->data->dev, "%s - count %d\n", __func__, count);
 706
 707         spin_lock_irqsave(&acm->write_lock, flags);
 708         wbn = acm_wb_alloc(acm);
 709         if (wbn < 0) {
 710                 spin_unlock_irqrestore(&acm->write_lock, flags);
 711                 return 0;
 712         }
 713         wb = &acm->wb[wbn];
 714
 715         count = (count > acm->writesize) ? acm->writesize : count;
 716         dev_vdbg(&acm->data->dev, "%s - write %d\n", __func__, count);
 717         memcpy(wb->buf, buf, count);
 718         wb->len = count;
 719         spin_unlock_irqrestore(&acm->write_lock, flags);
 720
 721         stat = acm_write_start(acm, wbn);
 722         if (stat < 0)
 723                 return stat;
 724         return count;
 725 }
 726
 727 static int acm_tty_write_room(struct tty_struct *tty)
 728 {
 729         struct acm *acm = tty->driver_data;
 730         /*
 731          * Do not let the line discipline to know that we have a reserve,
 732          * or it might get too enthusiastic.
 733          */
 734         return acm_wb_is_avail(acm) ? acm->writesize : 0;
 735 }
 736
 737 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
 738 {
 739         struct acm *acm = tty->driver_data;
 740         /*
 741          * if the device was unplugged then any remaining characters fell out
 742          * of the connector ;)
 743          */
 744         if (acm->disconnected)
 745                 return 0;
 746         /*
 747          * This is inaccurate (overcounts), but it works.
 748          */
 749         return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
 750 }
 751
 752 static void acm_tty_throttle(struct tty_struct *tty)
 753 {
 754         struct acm *acm = tty->driver_data;
 755
 756         spin_lock_irq(&acm->read_lock);
 757         acm->throttle_req = 1;
 758         spin_unlock_irq(&acm->read_lock);
 759 }
 760
 761 static void acm_tty_unthrottle(struct tty_struct *tty)
 762 {
 763         struct acm *acm = tty->driver_data;
 764         unsigned int was_throttled;
 765
 766         spin_lock_irq(&acm->read_lock);
 767         was_throttled = acm->int_throttled | acm->throttled;
 768         acm->int_throttled = 0;
 769         acm->throttled = 0;
 770         acm->throttle_req = 0;
 771
 772         if (was_throttled) {
 773                 while (!list_empty(&acm->rb_head)) {
 774                         struct acm_rb *rb = list_entry(acm->rb_head.next,
 775                                 struct acm_rb, rb_node);
 776                         int count = tty_insert_flip_string(&acm->port,
 777                                 rb->data, rb->alen);
 778                         if (count != rb->alen) {
 779                                 acm->int_throttled = 1;
 780                                 rb->data += count;
 781                                 rb->alen -= count;
 782                                 break;
 783                         } else {
 784                                 list_del(acm->rb_head.next);
 785                                 set_bit(rb->index, &acm->read_urbs_free);
 786                         }
 787                 }
 788                 spin_unlock_irq(&acm->read_lock);
 789
 790                 tty_flip_buffer_push(&acm->port);
 791
 792                 if (!acm->int_throttled)
 793                         acm_submit_read_urbs(acm, GFP_KERNEL);
 794         } else {
 795                 spin_unlock_irq(&acm->read_lock);
 796         }
 797 }
 798
 799 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
 800 {
 801         struct acm *acm = tty->driver_data;
 802         int retval;
 803
 804         retval = acm_send_break(acm, state ? 0xffff : 0);
 805         if (retval < 0)
 806                 dev_dbg(&acm->control->dev, "%s - send break failed\n",
 807                                                                 __func__);
 808         return retval;
 809 }
 810
 811 static int acm_tty_tiocmget(struct tty_struct *tty)
 812 {
 813         struct acm *acm = tty->driver_data;
 814
 815         return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
 816                (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
 817                (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
 818                (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
 819                (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
 820                TIOCM_CTS;
 821 }
 822
 823 static int acm_tty_tiocmset(struct tty_struct *tty,
 824                             unsigned int set, unsigned int clear)
 825 {
 826         struct acm *acm = tty->driver_data;
 827         unsigned int newctrl;
 828
 829         newctrl = acm->ctrlout;
 830         set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 831                                         (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 832         clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 833                                         (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 834
 835         newctrl = (newctrl & ~clear) | set;
 836
 837         if (acm->ctrlout == newctrl)
 838                 return 0;
 839         return acm_set_control(acm, acm->ctrlout = newctrl);
 840 }
 841
 842 static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
 843 {
 844         struct serial_struct tmp;
 845
 846         if (!info)
 847                 return -EINVAL;
 848
 849         memset(&tmp, 0, sizeof(tmp));
 850         tmp.flags = ASYNC_LOW_LATENCY;
 851         tmp.xmit_fifo_size = acm->writesize;
 852         tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
 853         tmp.close_delay = acm->port.close_delay / 10;
 854         tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 855                                 ASYNC_CLOSING_WAIT_NONE :
 856                                 acm->port.closing_wait / 10;
 857
 858         if (copy_to_user(info, &tmp, sizeof(tmp)))
 859                 return -EFAULT;
 860         else
 861                 return 0;
 862 }
 863
 864 static int set_serial_info(struct acm *acm,
 865                                 struct serial_struct __user *newinfo)
 866 {
 867         struct serial_struct new_serial;
 868         unsigned int closing_wait, close_delay;
 869         int retval = 0;
 870
 871         if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
 872                 return -EFAULT;
 873
 874         close_delay = new_serial.close_delay * 10;
 875         closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 876                         ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
 877
 878         mutex_lock(&acm->port.mutex);
 879
 880         if (!capable(CAP_SYS_ADMIN)) {
 881                 if ((close_delay != acm->port.close_delay) ||
 882                     (closing_wait != acm->port.closing_wait))
 883                         retval = -EPERM;
 884                 else
 885                         retval = -EOPNOTSUPP;
 886         } else {
 887                 acm->port.close_delay  = close_delay;
 888                 acm->port.closing_wait = closing_wait;
 889         }
 890
 891         mutex_unlock(&acm->port.mutex);
 892         return retval;
 893 }
 894
 895 static int acm_tty_ioctl(struct tty_struct *tty,
 896                                         unsigned int cmd, unsigned long arg)
 897 {
 898         struct acm *acm = tty->driver_data;
 899         int rv = -ENOIOCTLCMD;
 900
 901         switch (cmd) {
 902         case TIOCGSERIAL: /* gets serial port data */
 903                 rv = get_serial_info(acm, (struct serial_struct __user *) arg);
 904                 break;
 905         case TIOCSSERIAL:
 906                 rv = set_serial_info(acm, (struct serial_struct __user *) arg);
 907                 break;
 908         }
 909
 910         return rv;
 911 }
 912
 913 static void acm_tty_set_termios(struct tty_struct *tty,
 914                                                 struct ktermios *termios_old)
 915 {
 916         struct acm *acm = tty->driver_data;
 917         struct ktermios *termios = &tty->termios;
 918         struct usb_cdc_line_coding newline;
 919         int newctrl = acm->ctrlout;
 920
 921         newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
 922         newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
 923         newline.bParityType = termios->c_cflag & PARENB ?
 924                                 (termios->c_cflag & PARODD ? 1 : 2) +
 925                                 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
 926         switch (termios->c_cflag & CSIZE) {
 927         case CS5:
 928                 newline.bDataBits = 5;
 929                 break;
 930         case CS6:
 931                 newline.bDataBits = 6;
 932                 break;
 933         case CS7:
 934                 newline.bDataBits = 7;
 935                 break;
 936         case CS8:
 937         default:
 938                 newline.bDataBits = 8;
 939                 break;
 940         }
 941         /* FIXME: Needs to clear unsupported bits in the termios */
 942         acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
 943
 944         if (!newline.dwDTERate) {
 945                 newline.dwDTERate = acm->line.dwDTERate;
 946                 newctrl &= ~ACM_CTRL_DTR;
 947         } else
 948                 newctrl |=  ACM_CTRL_DTR;
 949
 950         if (newctrl != acm->ctrlout)
 951                 acm_set_control(acm, acm->ctrlout = newctrl);
 952
 953         if (memcmp(&acm->line, &newline, sizeof newline)) {
 954                 memcpy(&acm->line, &newline, sizeof newline);
 955                 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
 956                         __func__,
 957                         le32_to_cpu(newline.dwDTERate),
 958                         newline.bCharFormat, newline.bParityType,
 959                         newline.bDataBits);
 960                 acm_set_line(acm, &acm->line);
 961         }
 962 }
 963
 964 static const struct tty_port_operations acm_port_ops = {
 965         .shutdown = acm_port_shutdown,
 966         .activate = acm_port_activate,
 967         .destruct = acm_port_destruct,
 968 };
 969
 970 /*
 971  * USB probe and disconnect routines.
 972  */
 973
 974 /* Little helpers: write/read buffers free */
 975 static void acm_write_buffers_free(struct acm *acm)
 976 {
 977         int i;
 978         struct acm_wb *wb;
 979         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
 980
 981         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
 982                 usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah);
 983 }
 984
 985 static void acm_read_buffers_free(struct acm *acm)
 986 {
 987         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
 988         int i;
 989
 990         for (i = 0; i < acm->rx_buflimit; i++)
 991                 usb_free_coherent(usb_dev, acm->readsize,
 992                           acm->read_buffers[i].base, acm->read_buffers[i].dma);
 993 }
 994
 995 /* Little helper: write buffers allocate */
 996 static int acm_write_buffers_alloc(struct acm *acm)
 997 {
 998         int i;
 999         struct acm_wb *wb;
1000
1001         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1002                 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1003                     &wb->dmah);
1004                 if (!wb->buf) {
1005                         while (i != 0) {
1006                                 --i;
1007                                 --wb;
1008                                 usb_free_coherent(acm->dev, acm->writesize,
1009                                     wb->buf, wb->dmah);
1010                         }
1011                         return -ENOMEM;
1012                 }
1013         }
1014         return 0;
1015 }
1016
1017 static int acm_probe(struct usb_interface *intf,
1018                      const struct usb_device_id *id)
1019 {
1020         struct usb_cdc_union_desc *union_header = NULL;
1021         struct usb_cdc_country_functional_desc *cfd = NULL;
1022         unsigned char *buffer = intf->altsetting->extra;
1023         int buflen = intf->altsetting->extralen;
1024         struct usb_interface *control_interface;
1025         struct usb_interface *data_interface;
1026         struct usb_endpoint_descriptor *epctrl = NULL;
1027         struct usb_endpoint_descriptor *epread = NULL;
1028         struct usb_endpoint_descriptor *epwrite = NULL;
1029         struct usb_device *usb_dev = interface_to_usbdev(intf);
1030         struct acm *acm;
1031         int minor;
1032         int ctrlsize, readsize;
1033         u8 *buf;
1034         u8 ac_management_function = 0;
1035         u8 call_management_function = 0;
1036         int call_interface_num = -1;
1037         int data_interface_num = -1;
1038         unsigned long quirks;
1039         int num_rx_buf;
1040         int i;
1041         int combined_interfaces = 0;
1042         struct device *tty_dev;
1043         int rv = -ENOMEM;
1044
1045         /* normal quirks */
1046         quirks = (unsigned long)id->driver_info;
1047
1048         if (quirks & IGNORE_DEVICE)
1049                 return -ENODEV;
1050
1051         num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1052
1053         /* handle quirks deadly to normal probing*/
1054         if (quirks & NO_UNION_NORMAL) {
1055                 data_interface = usb_ifnum_to_if(usb_dev, 1);
1056                 control_interface = usb_ifnum_to_if(usb_dev, 0);
1057                 goto skip_normal_probe;
1058         }
1059
1060         /* normal probing*/
1061         if (!buffer) {
1062                 dev_err(&intf->dev, "Weird descriptor references\n");
1063                 return -EINVAL;
1064         }
1065
1066         if (!buflen) {
1067                 if (intf->cur_altsetting->endpoint &&
1068                                 intf->cur_altsetting->endpoint->extralen &&
1069                                 intf->cur_altsetting->endpoint->extra) {
1070                         dev_dbg(&intf->dev,
1071                                 "Seeking extra descriptors on endpoint\n");
1072                         buflen = intf->cur_altsetting->endpoint->extralen;
1073                         buffer = intf->cur_altsetting->endpoint->extra;
1074                 } else {
1075                         dev_err(&intf->dev,
1076                                 "Zero length descriptor references\n");
1077                         return -EINVAL;
1078                 }
1079         }
1080
1081         while (buflen > 0) {
1082                 if (buffer[1] != USB_DT_CS_INTERFACE) {
1083                         dev_err(&intf->dev, "skipping garbage\n");
1084                         goto next_desc;
1085                 }
1086
1087                 switch (buffer[2]) {
1088                 case USB_CDC_UNION_TYPE: /* we've found it */
1089                         if (union_header) {
1090                                 dev_err(&intf->dev, "More than one "
1091                                         "union descriptor, skipping ...\n");
1092                                 goto next_desc;
1093                         }
1094                         union_header = (struct usb_cdc_union_desc *)buffer;
1095                         break;
1096                 case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/
1097                         cfd = (struct usb_cdc_country_functional_desc *)buffer;
1098                         break;
1099                 case USB_CDC_HEADER_TYPE: /* maybe check version */
1100                         break; /* for now we ignore it */
1101                 case USB_CDC_ACM_TYPE:
1102                         ac_management_function = buffer[3];
1103                         break;
1104                 case USB_CDC_CALL_MANAGEMENT_TYPE:
1105                         call_management_function = buffer[3];
1106                         call_interface_num = buffer[4];
1107                         if ((quirks & NOT_A_MODEM) == 0 && (call_management_function & 3) != 3)
1108                                 dev_err(&intf->dev, "This device cannot do calls on its own. It is not a modem.\n");
1109                         break;
1110                 default:
1111                         /* there are LOTS more CDC descriptors that
1112                          * could legitimately be found here.
1113                          */
1114                         dev_dbg(&intf->dev, "Ignoring descriptor: "
1115                                         "type %02x, length %d\n",
1116                                         buffer[2], buffer[0]);
1117                         break;
1118                 }
1119 next_desc:
1120                 buflen -= buffer[0];
1121                 buffer += buffer[0];
1122         }
1123
1124         if (!union_header) {
1125                 if (call_interface_num > 0) {
1126                         dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1127                         /* quirks for Droids MuIn LCD */
1128                         if (quirks & NO_DATA_INTERFACE)
1129                                 data_interface = usb_ifnum_to_if(usb_dev, 0);
1130                         else
1131                                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
1132                         control_interface = intf;
1133                 } else {
1134                         if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1135                                 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1136                                 return -ENODEV;
1137                         } else {
1138                                 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1139                                 combined_interfaces = 1;
1140                                 control_interface = data_interface = intf;
1141                                 goto look_for_collapsed_interface;
1142                         }
1143                 }
1144         } else {
1145                 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1146                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0));
1147                 if (!control_interface || !data_interface) {
1148                         dev_dbg(&intf->dev, "no interfaces\n");
1149                         return -ENODEV;
1150                 }
1151         }
1152
1153         if (data_interface_num != call_interface_num)
1154                 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1155
1156         if (control_interface == data_interface) {
1157                 /* some broken devices designed for windows work this way */
1158                 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1159                 combined_interfaces = 1;
1160                 /* a popular other OS doesn't use it */
1161                 quirks |= NO_CAP_LINE;
1162                 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1163                         dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1164                         return -EINVAL;
1165                 }
1166 look_for_collapsed_interface:
1167                 for (i = 0; i < 3; i++) {
1168                         struct usb_endpoint_descriptor *ep;
1169                         ep = &data_interface->cur_altsetting->endpoint[i].desc;
1170
1171                         if (usb_endpoint_is_int_in(ep))
1172                                 epctrl = ep;
1173                         else if (usb_endpoint_is_bulk_out(ep))
1174                                 epwrite = ep;
1175                         else if (usb_endpoint_is_bulk_in(ep))
1176                                 epread = ep;
1177                         else
1178                                 return -EINVAL;
1179                 }
1180                 if (!epctrl || !epread || !epwrite)
1181                         return -ENODEV;
1182                 else
1183                         goto made_compressed_probe;
1184         }
1185
1186 skip_normal_probe:
1187
1188         /*workaround for switched interfaces */
1189         if (data_interface->cur_altsetting->desc.bInterfaceClass
1190                                                 != CDC_DATA_INTERFACE_TYPE) {
1191                 if (control_interface->cur_altsetting->desc.bInterfaceClass
1192                                                 == CDC_DATA_INTERFACE_TYPE) {
1193                         struct usb_interface *t;
1194                         dev_dbg(&intf->dev,
1195                                 "Your device has switched interfaces.\n");
1196                         t = control_interface;
1197                         control_interface = data_interface;
1198                         data_interface = t;
1199                 } else {
1200                         return -EINVAL;
1201                 }
1202         }
1203
1204         /* Accept probe requests only for the control interface */
1205         if (!combined_interfaces && intf != control_interface)
1206                 return -ENODEV;
1207
1208         if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1209                 /* valid in this context */
1210                 dev_dbg(&intf->dev, "The data interface isn't available\n");
1211                 return -EBUSY;
1212         }
1213
1214
1215         if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1216             control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1217                 return -EINVAL;
1218
1219         epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1220         epread = &data_interface->cur_altsetting->endpoint[0].desc;
1221         epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1222
1223
1224         /* workaround for switched endpoints */
1225         if (!usb_endpoint_dir_in(epread)) {
1226                 /* descriptors are swapped */
1227                 struct usb_endpoint_descriptor *t;
1228                 dev_dbg(&intf->dev,
1229                         "The data interface has switched endpoints\n");
1230                 t = epread;
1231                 epread = epwrite;
1232                 epwrite = t;
1233         }
1234 made_compressed_probe:
1235         dev_dbg(&intf->dev, "interfaces are valid\n");
1236
1237         acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1238         if (acm == NULL) {
1239                 dev_err(&intf->dev, "out of memory (acm kzalloc)\n");
1240                 goto alloc_fail;
1241         }
1242
1243         minor = acm_alloc_minor(acm);
1244         if (minor == ACM_TTY_MINORS) {
1245                 dev_err(&intf->dev, "no more free acm devices\n");
1246                 kfree(acm);
1247                 return -ENODEV;
1248         }
1249
1250         ctrlsize = usb_endpoint_maxp(epctrl);
1251         readsize = usb_endpoint_maxp(epread) *
1252                                 (quirks == SINGLE_RX_URB ? 1 : 2);
1253         acm->combined_interfaces = combined_interfaces;
1254         acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1255         acm->control = control_interface;
1256         acm->data = data_interface;
1257         acm->minor = minor;
1258         acm->dev = usb_dev;
1259         acm->ctrl_caps = ac_management_function;
1260         if (quirks & NO_CAP_LINE)
1261                 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1262         acm->ctrlsize = ctrlsize;
1263         acm->readsize = readsize;
1264         INIT_LIST_HEAD(&acm->rb_head);
1265         acm->rx_buflimit = num_rx_buf;
1266         INIT_WORK(&acm->work, acm_softint);
1267         init_usb_anchor(&acm->deferred);
1268         spin_lock_init(&acm->write_lock);
1269         spin_lock_init(&acm->read_lock);
1270         mutex_init(&acm->mutex);
1271         acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1272         acm->is_int_ep = usb_endpoint_xfer_int(epread);
1273         if (acm->is_int_ep)
1274                 acm->bInterval = epread->bInterval;
1275         if (quirks & NO_HANGUP_IN_RESET_RESUME)
1276                 acm->no_hangup_in_reset_resume = 1;
1277         tty_port_init(&acm->port);
1278         acm->port.ops = &acm_port_ops;
1279
1280         buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1281         if (!buf) {
1282                 dev_err(&intf->dev, "out of memory (ctrl buffer alloc)\n");
1283                 goto alloc_fail2;
1284         }
1285         acm->ctrl_buffer = buf;
1286
1287         if (acm_write_buffers_alloc(acm) < 0) {
1288                 dev_err(&intf->dev, "out of memory (write buffer alloc)\n");
1289                 goto alloc_fail4;
1290         }
1291
1292         acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1293         if (!acm->ctrlurb) {
1294                 dev_err(&intf->dev, "out of memory (ctrlurb kmalloc)\n");
1295                 goto alloc_fail5;
1296         }
1297         for (i = 0; i < num_rx_buf; i++) {
1298                 struct acm_rb *rb = &(acm->read_buffers[i]);
1299                 struct urb *urb;
1300
1301                 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1302                                                                 &rb->dma);
1303                 if (!rb->base) {
1304                         dev_err(&intf->dev, "out of memory "
1305                                         "(read bufs usb_alloc_coherent)\n");
1306                         goto alloc_fail6;
1307                 }
1308                 rb->index = i;
1309                 rb->instance = acm;
1310
1311                 urb = usb_alloc_urb(0, GFP_KERNEL);
1312                 if (!urb) {
1313                         dev_err(&intf->dev,
1314                                 "out of memory (read urbs usb_alloc_urb)\n");
1315                         goto alloc_fail6;
1316                 }
1317                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1318                 urb->transfer_dma = rb->dma;
1319                 if (acm->is_int_ep) {
1320                         usb_fill_int_urb(urb, acm->dev,
1321                                          acm->rx_endpoint,
1322                                          rb->base,
1323                                          acm->readsize,
1324                                          acm_read_bulk_callback, rb,
1325                                          acm->bInterval);
1326                 } else {
1327                         usb_fill_bulk_urb(urb, acm->dev,
1328                                           acm->rx_endpoint,
1329                                           rb->base,
1330                                           acm->readsize,
1331                                           acm_read_bulk_callback, rb);
1332                 }
1333
1334                 acm->read_urbs[i] = urb;
1335                 __set_bit(i, &acm->read_urbs_free);
1336         }
1337         for (i = 0; i < ACM_NW; i++) {
1338                 struct acm_wb *snd = &(acm->wb[i]);
1339
1340                 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1341                 if (snd->urb == NULL) {
1342                         dev_err(&intf->dev,
1343                                 "out of memory (write urbs usb_alloc_urb)\n");
1344                         goto alloc_fail7;
1345                 }
1346
1347                 if (usb_endpoint_xfer_int(epwrite))
1348                         usb_fill_int_urb(snd->urb, usb_dev,
1349                                 usb_sndintpipe(usb_dev, epwrite->bEndpointAddress),
1350                                 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1351                 else
1352                         usb_fill_bulk_urb(snd->urb, usb_dev,
1353                                 usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
1354                                 NULL, acm->writesize, acm_write_bulk, snd);
1355                 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1356                 snd->instance = acm;
1357         }
1358
1359         usb_set_intfdata(intf, acm);
1360
1361         i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1362         if (i < 0)
1363                 goto alloc_fail7;
1364
1365         if (cfd) { /* export the country data */
1366                 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1367                 if (!acm->country_codes)
1368                         goto skip_countries;
1369                 acm->country_code_size = cfd->bLength - 4;
1370                 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1371                                                         cfd->bLength - 4);
1372                 acm->country_rel_date = cfd->iCountryCodeRelDate;
1373
1374                 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1375                 if (i < 0) {
1376                         kfree(acm->country_codes);
1377                         acm->country_codes = NULL;
1378                         acm->country_code_size = 0;
1379                         goto skip_countries;
1380                 }
1381
1382                 i = device_create_file(&intf->dev,
1383                                                 &dev_attr_iCountryCodeRelDate);
1384                 if (i < 0) {
1385                         device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1386                         kfree(acm->country_codes);
1387                         acm->country_codes = NULL;
1388                         acm->country_code_size = 0;
1389                         goto skip_countries;
1390                 }
1391         }
1392
1393 skip_countries:
1394         usb_fill_int_urb(acm->ctrlurb, usb_dev,
1395                          usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1396                          acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1397                          /* works around buggy devices */
1398                          epctrl->bInterval ? epctrl->bInterval : 0xff);
1399         acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1400         acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1401
1402         dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1403
1404         acm_set_control(acm, acm->ctrlout);
1405
1406         acm->line.dwDTERate = cpu_to_le32(9600);
1407         acm->line.bDataBits = 8;
1408         acm_set_line(acm, &acm->line);
1409
1410         usb_driver_claim_interface(&acm_driver, data_interface, acm);
1411         usb_set_intfdata(data_interface, acm);
1412
1413         usb_get_intf(control_interface);
1414         tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1415                         &control_interface->dev);
1416         if (IS_ERR(tty_dev)) {
1417                 rv = PTR_ERR(tty_dev);
1418                 goto alloc_fail8;
1419         }
1420
1421         return 0;
1422 alloc_fail8:
1423         if (acm->country_codes) {
1424                 device_remove_file(&acm->control->dev,
1425                                 &dev_attr_wCountryCodes);
1426                 device_remove_file(&acm->control->dev,
1427                                 &dev_attr_iCountryCodeRelDate);
1428         }
1429         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1430 alloc_fail7:
1431         usb_set_intfdata(intf, NULL);
1432         for (i = 0; i < ACM_NW; i++)
1433                 usb_free_urb(acm->wb[i].urb);
1434 alloc_fail6:
1435         for (i = 0; i < num_rx_buf; i++)
1436                 usb_free_urb(acm->read_urbs[i]);
1437         acm_read_buffers_free(acm);
1438         usb_free_urb(acm->ctrlurb);
1439 alloc_fail5:
1440         acm_write_buffers_free(acm);
1441 alloc_fail4:
1442         usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1443 alloc_fail2:
1444         acm_release_minor(acm);
1445         kfree(acm);
1446 alloc_fail:
1447         return rv;
1448 }
1449
1450 static void stop_data_traffic(struct acm *acm)
1451 {
1452         int i;
1453
1454         if (!acm) {
1455                 pr_err("%s: !acm\n", __func__);
1456                 return;
1457         }
1458
1459         dev_dbg(&acm->control->dev, "%s\n", __func__);
1460
1461         usb_kill_urb(acm->ctrlurb);
1462         for (i = 0; i < ACM_NW; i++)
1463                 usb_kill_urb(acm->wb[i].urb);
1464         for (i = 0; i < acm->rx_buflimit; i++)
1465                 usb_kill_urb(acm->read_urbs[i]);
1466
1467         cancel_work_sync(&acm->work);
1468 }
1469
1470 static void acm_disconnect(struct usb_interface *intf)
1471 {
1472         struct acm *acm = usb_get_intfdata(intf);
1473         struct usb_device *usb_dev = interface_to_usbdev(intf);
1474         struct tty_struct *tty;
1475         struct urb *res;
1476         int i;
1477
1478         dev_dbg(&intf->dev, "%s\n", __func__);
1479
1480         /* sibling interface is already cleaning up */
1481         if (!acm)
1482                 return;
1483
1484         mutex_lock(&acm->mutex);
1485         acm->disconnected = true;
1486         if (acm->country_codes) {
1487                 device_remove_file(&acm->control->dev,
1488                                 &dev_attr_wCountryCodes);
1489                 device_remove_file(&acm->control->dev,
1490                                 &dev_attr_iCountryCodeRelDate);
1491         }
1492         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1493         usb_set_intfdata(acm->control, NULL);
1494         usb_set_intfdata(acm->data, NULL);
1495         mutex_unlock(&acm->mutex);
1496
1497         tty = tty_port_tty_get(&acm->port);
1498         if (tty) {
1499                 tty_vhangup(tty);
1500                 tty_kref_put(tty);
1501         }
1502
1503         stop_data_traffic(acm);
1504
1505         tty_unregister_device(acm_tty_driver, acm->minor);
1506
1507         /* decrement ref count of anchored urbs */
1508         while ((res = usb_get_from_anchor(&acm->deferred)))
1509                 usb_put_urb(res);
1510         usb_free_urb(acm->ctrlurb);
1511         for (i = 0; i < ACM_NW; i++)
1512                 usb_free_urb(acm->wb[i].urb);
1513         for (i = 0; i < acm->rx_buflimit; i++)
1514                 usb_free_urb(acm->read_urbs[i]);
1515         acm_write_buffers_free(acm);
1516         usb_free_coherent(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1517         acm_read_buffers_free(acm);
1518
1519         if (!acm->combined_interfaces)
1520                 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1521                                         acm->data : acm->control);
1522
1523         tty_port_put(&acm->port);
1524 }
1525
1526 #ifdef CONFIG_PM
1527 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1528 {
1529         struct acm *acm = usb_get_intfdata(intf);
1530         int cnt;
1531
1532         if (!acm) {
1533                 pr_err("%s: !acm\n", __func__);
1534                 return -ENODEV;
1535         }
1536
1537         if (PMSG_IS_AUTO(message)) {
1538                 int b;
1539
1540                 spin_lock_irq(&acm->write_lock);
1541                 b = acm->transmitting;
1542                 spin_unlock_irq(&acm->write_lock);
1543                 if (b)
1544                         return -EBUSY;
1545         }
1546
1547         spin_lock_irq(&acm->read_lock);
1548         spin_lock(&acm->write_lock);
1549         cnt = acm->susp_count++;
1550         spin_unlock(&acm->write_lock);
1551         spin_unlock_irq(&acm->read_lock);
1552
1553         if (cnt)
1554                 return 0;
1555
1556         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
1557                 stop_data_traffic(acm);
1558
1559         return 0;
1560 }
1561
1562 static int acm_resume(struct usb_interface *intf)
1563 {
1564         struct acm *acm = usb_get_intfdata(intf);
1565         int rv = 0;
1566         int cnt;
1567 #ifdef CONFIG_PM
1568         struct urb *res;
1569 #else
1570         struct acm_wb *wb;
1571 #endif
1572
1573         if (!acm) {
1574                 pr_err("%s: !acm\n", __func__);
1575                 return -ENODEV;
1576         }
1577
1578         spin_lock_irq(&acm->read_lock);
1579         if (acm->susp_count > 0) {
1580                 acm->susp_count -= 1;
1581                 cnt = acm->susp_count;
1582         } else {
1583                 spin_unlock_irq(&acm->read_lock);
1584                 return 0;
1585         }
1586         spin_unlock_irq(&acm->read_lock);
1587
1588         if (cnt)
1589                 return 0;
1590
1591         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags)) {
1592                 rv = usb_submit_urb(acm->ctrlurb, GFP_NOIO);
1593                 spin_lock_irq(&acm->write_lock);
1594 #ifdef CONFIG_PM
1595                 while ((res = usb_get_from_anchor(&acm->deferred))) {
1596                         /* decrement ref count*/
1597                         usb_put_urb(res);
1598                         rv = usb_submit_urb(res, GFP_ATOMIC);
1599                         if (rv < 0) {
1600                                 dev_dbg(&acm->data->dev,
1601                                         "usb_submit_urb(pending request) failed: %d",
1602                                         rv);
1603                                 usb_unanchor_urb(res);
1604                                 acm_write_done(acm, res->context);
1605                         }
1606                 }
1607                 spin_unlock_irq(&acm->write_lock);
1608 #else
1609                 if (acm->delayed_wb) {
1610                         wb = acm->delayed_wb;
1611                         acm->delayed_wb = NULL;
1612                         spin_unlock_irq(&acm->write_lock);
1613                         acm_start_wb(acm, wb);
1614                 } else {
1615                         spin_unlock_irq(&acm->write_lock);
1616                 }
1617 #endif
1618
1619                 /*
1620                  * delayed error checking because we must
1621                  * do the write path at all cost
1622                  */
1623                 if (rv < 0)
1624                         goto err_out;
1625
1626                 rv = acm_submit_read_urbs(acm, GFP_NOIO);
1627         }
1628
1629 err_out:
1630         return rv;
1631 }
1632
1633 static int acm_reset_resume(struct usb_interface *intf)
1634 {
1635         struct acm *acm = usb_get_intfdata(intf);
1636         struct tty_struct *tty;
1637
1638         if (!acm) {
1639                 pr_err("%s: !acm\n", __func__);
1640                 return -ENODEV;
1641         }
1642
1643         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags)) {
1644                 tty = tty_port_tty_get(&acm->port);
1645                 if (tty) {
1646                         if (!acm->no_hangup_in_reset_resume)
1647                                 tty_hangup(tty);
1648                         tty_kref_put(tty);
1649                 }
1650         }
1651
1652         return acm_resume(intf);
1653 }
1654
1655 #endif /* CONFIG_PM */
1656
1657 #define NOKIA_PCSUITE_ACM_INFO(x) \
1658                 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1659                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1660                 USB_CDC_ACM_PROTO_VENDOR)
1661
1662 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1663                 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1664                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1665                 USB_CDC_ACM_PROTO_VENDOR)
1666
1667 /*
1668  * USB driver structure.
1669  */
1670
1671 static const struct usb_device_id acm_ids[] = {
1672         /* quirky and broken devices */
1673         { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1674         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1675         { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1676         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1677         },
1678         { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1679         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1680         },
1681         { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1682         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1683         },
1684         { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1685         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1686         },
1687         { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1688         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1689         },
1690         { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1691         .driver_info = SINGLE_RX_URB,
1692         },
1693         { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1694         .driver_info = SINGLE_RX_URB, /* firmware bug */
1695         },
1696         { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1697         .driver_info = SINGLE_RX_URB, /* firmware bug */
1698         },
1699         { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1700         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1701         },
1702         { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1703         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1704         },
1705         { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1706         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1707         },
1708         { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1709         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1710         },
1711         { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1712         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1713         },
1714         { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1715         },
1716         /* Motorola H24 HSPA module: */
1717         { USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1718         { USB_DEVICE(0x22b8, 0x2d92) }, /* modem           + diagnostics        */
1719         { USB_DEVICE(0x22b8, 0x2d93) }, /* modem + AT port                      */
1720         { USB_DEVICE(0x22b8, 0x2d95) }, /* modem + AT port + diagnostics        */
1721         { USB_DEVICE(0x22b8, 0x2d96) }, /* modem                         + NMEA */
1722         { USB_DEVICE(0x22b8, 0x2d97) }, /* modem           + diagnostics + NMEA */
1723         { USB_DEVICE(0x22b8, 0x2d99) }, /* modem + AT port               + NMEA */
1724         { USB_DEVICE(0x22b8, 0x2d9a) }, /* modem + AT port + diagnostics + NMEA */
1725
1726         { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1727         .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1728                                            data interface instead of
1729                                            communications interface.
1730                                            Maybe we should define a new
1731                                            quirk for this. */
1732         },
1733         { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1734         .driver_info = NO_UNION_NORMAL,
1735         },
1736         { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1737         .driver_info = NO_UNION_NORMAL,
1738         },
1739         { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1740         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1741         },
1742         { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1743         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1744         },
1745         { USB_DEVICE(0x1519, 0x0020),
1746         .driver_info = NO_UNION_NORMAL | NO_HANGUP_IN_RESET_RESUME, /* has no union descriptor */
1747         },
1748
1749         /* Nokia S60 phones expose two ACM channels. The first is
1750          * a modem and is picked up by the standard AT-command
1751          * information below. The second is 'vendor-specific' but
1752          * is treated as a serial device at the S60 end, so we want
1753          * to expose it on Linux too. */
1754         { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1755         { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1756         { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1757         { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1758         { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1759         { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1760         { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1761         { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1762         { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1763         { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1764         { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1765         { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1766         { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1767         { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1768         { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1769         { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1770         { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1771         { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1772         { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1773         { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1774         { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1775         { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1776         { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1777         { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1778         { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1779         { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1780         { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1781         { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1782         { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1783         { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1784         { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1785         { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
1786         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1787         { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1788         { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1789         { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1790         { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1791         { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1792         { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1793         { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1794         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1795         { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1796         { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1797         { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1798         { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1799         { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1800         { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1801         { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1802         { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1803         { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1804         { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1805         { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1806         { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1807         { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1808         { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1809         { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1810         { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1811         { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1812
1813         /* Support for Owen devices */
1814         { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1815
1816         /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1817
1818         /* Support Lego NXT using pbLua firmware */
1819         { USB_DEVICE(0x0694, 0xff00),
1820         .driver_info = NOT_A_MODEM,
1821         },
1822
1823         /* Support for Droids MuIn LCD */
1824         { USB_DEVICE(0x04d8, 0x000b),
1825         .driver_info = NO_DATA_INTERFACE,
1826         },
1827
1828 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1829         { USB_DEVICE(0x04d8, 0x0082),   /* Application mode */
1830         .driver_info = IGNORE_DEVICE,
1831         },
1832         { USB_DEVICE(0x04d8, 0x0083),   /* Bootloader mode */
1833         .driver_info = IGNORE_DEVICE,
1834         },
1835 #endif
1836
1837         /* Exclude XMM6260 boot rom (not running modem software yet) */
1838         { USB_DEVICE(0x058b, 0x0041),
1839         .driver_info = IGNORE_DEVICE,
1840         },
1841
1842         /* Icera 450 */
1843         { USB_DEVICE(0x1983, 0x0321),
1844         .driver_info = NO_HANGUP_IN_RESET_RESUME,
1845         },
1846
1847         /* control interfaces without any protocol set */
1848         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1849                 USB_CDC_PROTO_NONE) },
1850
1851         /* control interfaces with various AT-command sets */
1852         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1853                 USB_CDC_ACM_PROTO_AT_V25TER) },
1854         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1855                 USB_CDC_ACM_PROTO_AT_PCCA101) },
1856         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1857                 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1858         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1859                 USB_CDC_ACM_PROTO_AT_GSM) },
1860         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1861                 USB_CDC_ACM_PROTO_AT_3G) },
1862         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1863                 USB_CDC_ACM_PROTO_AT_CDMA) },
1864
1865         { }
1866 };
1867
1868 MODULE_DEVICE_TABLE(usb, acm_ids);
1869
1870 static struct usb_driver acm_driver = {
1871         .name =         "cdc_acm",
1872         .probe =        acm_probe,
1873         .disconnect =   acm_disconnect,
1874 #ifdef CONFIG_PM
1875         .suspend =      acm_suspend,
1876         .resume =       acm_resume,
1877         .reset_resume = acm_reset_resume,
1878 #endif
1879         .id_table =     acm_ids,
1880 #ifdef CONFIG_PM
1881         .supports_autosuspend = 1,
1882 #endif
1883         .disable_hub_initiated_lpm = 1,
1884 };
1885
1886 /*
1887  * TTY driver structures.
1888  */
1889
1890 static const struct tty_operations acm_ops = {
1891         .install =              acm_tty_install,
1892         .open =                 acm_tty_open,
1893         .close =                acm_tty_close,
1894         .cleanup =              acm_tty_cleanup,
1895         .hangup =               acm_tty_hangup,
1896         .write =                acm_tty_write,
1897         .write_room =           acm_tty_write_room,
1898         .ioctl =                acm_tty_ioctl,
1899         .throttle =             acm_tty_throttle,
1900         .unthrottle =           acm_tty_unthrottle,
1901         .chars_in_buffer =      acm_tty_chars_in_buffer,
1902         .break_ctl =            acm_tty_break_ctl,
1903         .set_termios =          acm_tty_set_termios,
1904         .tiocmget =             acm_tty_tiocmget,
1905         .tiocmset =             acm_tty_tiocmset,
1906 };
1907
1908 /*
1909  * Init / exit.
1910  */
1911
1912 static int __init acm_init(void)
1913 {
1914         int retval;
1915         acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
1916         if (!acm_tty_driver)
1917                 return -ENOMEM;
1918         acm_tty_driver->driver_name = "acm",
1919         acm_tty_driver->name = "ttyACM",
1920         acm_tty_driver->major = ACM_TTY_MAJOR,
1921         acm_tty_driver->minor_start = 0,
1922         acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
1923         acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
1924         acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1925         acm_tty_driver->init_termios = tty_std_termios;
1926         acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
1927                                                                 HUPCL | CLOCAL;
1928         tty_set_operations(acm_tty_driver, &acm_ops);
1929
1930         retval = tty_register_driver(acm_tty_driver);
1931         if (retval) {
1932                 put_tty_driver(acm_tty_driver);
1933                 return retval;
1934         }
1935
1936         retval = usb_register(&acm_driver);
1937         if (retval) {
1938                 tty_unregister_driver(acm_tty_driver);
1939                 put_tty_driver(acm_tty_driver);
1940                 return retval;
1941         }
1942
1943         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1944
1945         return 0;
1946 }
1947
1948 static void __exit acm_exit(void)
1949 {
1950         usb_deregister(&acm_driver);
1951         tty_unregister_driver(acm_tty_driver);
1952         put_tty_driver(acm_tty_driver);
1953 }
1954
1955 module_init(acm_init);
1956 module_exit(acm_exit);
1957
1958 MODULE_AUTHOR(DRIVER_AUTHOR);
1959 MODULE_DESCRIPTION(DRIVER_DESC);
1960 MODULE_LICENSE("GPL");
1961 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);