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/idr.h>
  50 #include <linux/list.h>
  51
  52 #include "cdc-acm.h"
  53
  54
  55 #define DRIVER_AUTHOR "Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik, David Kubicek, Johan Hovold"
  56 #define DRIVER_DESC "USB Abstract Control Model driver for USB modems and ISDN adapters"
  57
  58 static struct usb_driver acm_driver;
  59 static struct tty_driver *acm_tty_driver;
  60
  61 static DEFINE_IDR(acm_minors);
  62 static DEFINE_MUTEX(acm_minors_lock);
  63
  64 static void acm_tty_set_termios(struct tty_struct *tty,
  65                                 struct ktermios *termios_old);
  66
  67 /*
  68  * acm_minors accessors
  69  */
  70
  71 /*
  72  * Look up an ACM structure by minor. If found and not disconnected, increment
  73  * its refcount and return it with its mutex held.
  74  */
  75 static struct acm *acm_get_by_minor(unsigned int minor)
  76 {
  77         struct acm *acm;
  78
  79         mutex_lock(&acm_minors_lock);
  80         acm = idr_find(&acm_minors, minor);
  81         if (acm) {
  82                 mutex_lock(&acm->mutex);
  83                 if (acm->disconnected) {
  84                         mutex_unlock(&acm->mutex);
  85                         acm = NULL;
  86                 } else {
  87                         tty_port_get(&acm->port);
  88                         mutex_unlock(&acm->mutex);
  89                 }
  90         }
  91         mutex_unlock(&acm_minors_lock);
  92         return acm;
  93 }
  94
  95 /*
  96  * Try to find an available minor number and if found, associate it with 'acm'.
  97  */
  98 static int acm_alloc_minor(struct acm *acm)
  99 {
 100         int minor;
 101
 102         mutex_lock(&acm_minors_lock);
 103         minor = idr_alloc(&acm_minors, acm, 0, ACM_TTY_MINORS, GFP_KERNEL);
 104         mutex_unlock(&acm_minors_lock);
 105
 106         return minor;
 107 }
 108
 109 /* Release the minor number associated with 'acm'.  */
 110 static void acm_release_minor(struct acm *acm)
 111 {
 112         mutex_lock(&acm_minors_lock);
 113         idr_remove(&acm_minors, acm->minor);
 114         mutex_unlock(&acm_minors_lock);
 115 }
 116
 117 /*
 118  * Functions for ACM control messages.
 119  */
 120
 121 static int acm_ctrl_msg(struct acm *acm, int request, int value,
 122                                                         void *buf, int len)
 123 {
 124         int retval;
 125
 126         retval = usb_autopm_get_interface(acm->control);
 127         if (retval)
 128                 return retval;
 129
 130         retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
 131                 request, USB_RT_ACM, value,
 132                 acm->control->altsetting[0].desc.bInterfaceNumber,
 133                 buf, len, 5000);
 134
 135         dev_dbg(&acm->control->dev,
 136                         "%s - rq 0x%02x, val %#x, len %#x, result %d\n",
 137                         __func__, request, value, len, retval);
 138
 139         usb_autopm_put_interface(acm->control);
 140
 141         return retval < 0 ? retval : 0;
 142 }
 143
 144 /* devices aren't required to support these requests.
 145  * the cdc acm descriptor tells whether they do...
 146  */
 147 static inline int acm_set_control(struct acm *acm, int control)
 148 {
 149         if (acm->quirks & QUIRK_CONTROL_LINE_STATE)
 150                 return -EOPNOTSUPP;
 151
 152         return acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE,
 153                         control, NULL, 0);
 154 }
 155
 156 #define acm_set_line(acm, line) \
 157         acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
 158 #define acm_send_break(acm, ms) \
 159         acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)
 160
 161 /*
 162  * Write buffer management.
 163  * All of these assume proper locks taken by the caller.
 164  */
 165
 166 static int acm_wb_alloc(struct acm *acm)
 167 {
 168         int i, wbn;
 169         struct acm_wb *wb;
 170
 171         wbn = 0;
 172         i = 0;
 173         for (;;) {
 174                 wb = &acm->wb[wbn];
 175                 if (!wb->use) {
 176                         wb->use = 1;
 177                         return wbn;
 178                 }
 179                 wbn = (wbn + 1) % ACM_NW;
 180                 if (++i >= ACM_NW)
 181                         return -1;
 182         }
 183 }
 184
 185 static int acm_wb_is_avail(struct acm *acm)
 186 {
 187         int i, n;
 188         unsigned long flags;
 189
 190         n = ACM_NW;
 191         spin_lock_irqsave(&acm->write_lock, flags);
 192         for (i = 0; i < ACM_NW; i++)
 193                 n -= acm->wb[i].use;
 194         spin_unlock_irqrestore(&acm->write_lock, flags);
 195         return n;
 196 }
 197
 198 /*
 199  * Finish write. Caller must hold acm->write_lock
 200  */
 201 static void acm_write_done(struct acm *acm, struct acm_wb *wb)
 202 {
 203         wb->use = 0;
 204         acm->transmitting--;
 205         usb_autopm_put_interface_async(acm->control);
 206 }
 207
 208 /*
 209  * Poke write.
 210  *
 211  * the caller is responsible for locking
 212  */
 213
 214 static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
 215 {
 216         int rc;
 217
 218         acm->transmitting++;
 219
 220         wb->urb->transfer_buffer = wb->buf;
 221         wb->urb->transfer_dma = wb->dmah;
 222         wb->urb->transfer_buffer_length = wb->len;
 223         wb->urb->dev = acm->dev;
 224
 225         rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
 226         if (rc < 0) {
 227                 dev_err(&acm->data->dev,
 228                         "%s - usb_submit_urb(write bulk) failed: %d\n",
 229                         __func__, rc);
 230                 acm_write_done(acm, wb);
 231         }
 232         return rc;
 233 }
 234
 235 /*
 236  * attributes exported through sysfs
 237  */
 238 static ssize_t show_caps
 239 (struct device *dev, struct device_attribute *attr, char *buf)
 240 {
 241         struct usb_interface *intf = to_usb_interface(dev);
 242         struct acm *acm = usb_get_intfdata(intf);
 243
 244         return sprintf(buf, "%d", acm->ctrl_caps);
 245 }
 246 static DEVICE_ATTR(bmCapabilities, S_IRUGO, show_caps, NULL);
 247
 248 static ssize_t show_country_codes
 249 (struct device *dev, struct device_attribute *attr, char *buf)
 250 {
 251         struct usb_interface *intf = to_usb_interface(dev);
 252         struct acm *acm = usb_get_intfdata(intf);
 253
 254         memcpy(buf, acm->country_codes, acm->country_code_size);
 255         return acm->country_code_size;
 256 }
 257
 258 static DEVICE_ATTR(wCountryCodes, S_IRUGO, show_country_codes, NULL);
 259
 260 static ssize_t show_country_rel_date
 261 (struct device *dev, struct device_attribute *attr, char *buf)
 262 {
 263         struct usb_interface *intf = to_usb_interface(dev);
 264         struct acm *acm = usb_get_intfdata(intf);
 265
 266         return sprintf(buf, "%d", acm->country_rel_date);
 267 }
 268
 269 static DEVICE_ATTR(iCountryCodeRelDate, S_IRUGO, show_country_rel_date, NULL);
 270 /*
 271  * Interrupt handlers for various ACM device responses
 272  */
 273
 274 /* control interface reports status changes with "interrupt" transfers */
 275 static void acm_ctrl_irq(struct urb *urb)
 276 {
 277         struct acm *acm = urb->context;
 278         struct usb_cdc_notification *dr = urb->transfer_buffer;
 279         unsigned char *data;
 280         int newctrl;
 281         int difference;
 282         int retval;
 283         int status = urb->status;
 284
 285         switch (status) {
 286         case 0:
 287                 /* success */
 288                 break;
 289         case -ECONNRESET:
 290         case -ENOENT:
 291         case -ESHUTDOWN:
 292                 /* this urb is terminated, clean up */
 293                 dev_dbg(&acm->control->dev,
 294                                 "%s - urb shutting down with status: %d\n",
 295                                 __func__, status);
 296                 return;
 297         default:
 298                 dev_dbg(&acm->control->dev,
 299                                 "%s - nonzero urb status received: %d\n",
 300                                 __func__, status);
 301                 goto exit;
 302         }
 303
 304         usb_mark_last_busy(acm->dev);
 305
 306         data = (unsigned char *)(dr + 1);
 307         switch (dr->bNotificationType) {
 308         case USB_CDC_NOTIFY_NETWORK_CONNECTION:
 309                 dev_dbg(&acm->control->dev, "%s - network connection: %d\n",
 310                                                         __func__, dr->wValue);
 311                 break;
 312
 313         case USB_CDC_NOTIFY_SERIAL_STATE:
 314                 if (le16_to_cpu(dr->wLength) != 2) {
 315                         dev_dbg(&acm->control->dev,
 316                                 "%s - malformed serial state\n", __func__);
 317                         break;
 318                 }
 319
 320                 newctrl = get_unaligned_le16(data);
 321
 322                 if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
 323                         dev_dbg(&acm->control->dev, "%s - calling hangup\n",
 324                                         __func__);
 325                         tty_port_tty_hangup(&acm->port, false);
 326                 }
 327
 328                 difference = acm->ctrlin ^ newctrl;
 329                 spin_lock(&acm->read_lock);
 330                 acm->ctrlin = newctrl;
 331                 acm->oldcount = acm->iocount;
 332
 333                 if (difference & ACM_CTRL_DSR)
 334                         acm->iocount.dsr++;
 335                 if (difference & ACM_CTRL_DCD)
 336                         acm->iocount.dcd++;
 337                 if (newctrl & ACM_CTRL_BRK) {
 338                         acm->iocount.brk++;
 339                         tty_insert_flip_char(&acm->port, 0, TTY_BREAK);
 340                 }
 341                 if (newctrl & ACM_CTRL_RI)
 342                         acm->iocount.rng++;
 343                 if (newctrl & ACM_CTRL_FRAMING)
 344                         acm->iocount.frame++;
 345                 if (newctrl & ACM_CTRL_PARITY)
 346                         acm->iocount.parity++;
 347                 if (newctrl & ACM_CTRL_OVERRUN)
 348                         acm->iocount.overrun++;
 349                 spin_unlock(&acm->read_lock);
 350
 351                 if (difference)
 352                         wake_up_all(&acm->wioctl);
 353
 354                 break;
 355
 356         default:
 357                 dev_dbg(&acm->control->dev,
 358                         "%s - unknown notification %d received: index %d len %d\n",
 359                         __func__,
 360                         dr->bNotificationType, dr->wIndex, dr->wLength);
 361
 362                 break;
 363         }
 364 exit:
 365         retval = usb_submit_urb(urb, GFP_ATOMIC);
 366         if (retval && retval != -EPERM)
 367                 dev_err(&acm->control->dev, "%s - usb_submit_urb failed: %d\n",
 368                                                         __func__, retval);
 369 }
 370
 371 static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
 372 {
 373         int res;
 374
 375         if (!test_and_clear_bit(index, &acm->read_urbs_free))
 376                 return 0;
 377
 378         dev_vdbg(&acm->data->dev, "%s - urb %d\n", __func__, index);
 379
 380         res = usb_submit_urb(acm->read_urbs[index], mem_flags);
 381         if (res) {
 382                 if (res != -EPERM && res != -ENODEV) {
 383                         dev_err(&acm->data->dev,
 384                                         "%s - usb_submit_urb failed: %d\n",
 385                                         __func__, res);
 386                 }
 387                 set_bit(index, &acm->read_urbs_free);
 388                 return res;
 389         }
 390
 391         return 0;
 392 }
 393
 394 static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
 395 {
 396         int res;
 397         int i;
 398
 399         for (i = 0; i < acm->rx_buflimit; ++i) {
 400                 res = acm_submit_read_urb(acm, i, mem_flags);
 401                 if (res)
 402                         return res;
 403         }
 404
 405         return 0;
 406 }
 407
 408 static void acm_process_read_urb(struct acm *acm, struct urb *urb)
 409 {
 410         if (!urb->actual_length)
 411                 return;
 412
 413         tty_insert_flip_string(&acm->port, urb->transfer_buffer,
 414                         urb->actual_length);
 415         tty_flip_buffer_push(&acm->port);
 416 }
 417
 418 static void acm_read_bulk_callback(struct urb *urb)
 419 {
 420         struct acm_rb *rb = urb->context;
 421         struct acm *acm = rb->instance;
 422         unsigned long flags;
 423         int status = urb->status;
 424
 425         dev_vdbg(&acm->data->dev, "%s - urb %d, len %d\n", __func__,
 426                                         rb->index, urb->actual_length);
 427
 428         if (!acm->dev) {
 429                 set_bit(rb->index, &acm->read_urbs_free);
 430                 dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
 431                 return;
 432         }
 433
 434         if (status) {
 435                 set_bit(rb->index, &acm->read_urbs_free);
 436                 dev_dbg(&acm->data->dev, "%s - non-zero urb status: %d\n",
 437                                                         __func__, status);
 438                 if ((status != -ENOENT) || (urb->actual_length == 0))
 439                         return;
 440         }
 441
 442         usb_mark_last_busy(acm->dev);
 443
 444         acm_process_read_urb(acm, urb);
 445         /*
 446          * Unthrottle may run on another CPU which needs to see events
 447          * in the same order. Submission has an implict barrier
 448          */
 449         smp_mb__before_atomic();
 450         set_bit(rb->index, &acm->read_urbs_free);
 451
 452         /* throttle device if requested by tty */
 453         spin_lock_irqsave(&acm->read_lock, flags);
 454         acm->throttled = acm->throttle_req;
 455         if (!acm->throttled) {
 456                 spin_unlock_irqrestore(&acm->read_lock, flags);
 457                 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
 458         } else {
 459                 spin_unlock_irqrestore(&acm->read_lock, flags);
 460         }
 461 }
 462
 463 /* data interface wrote those outgoing bytes */
 464 static void acm_write_bulk(struct urb *urb)
 465 {
 466         struct acm_wb *wb = urb->context;
 467         struct acm *acm = wb->instance;
 468         unsigned long flags;
 469         int status = urb->status;
 470
 471         if (status || (urb->actual_length != urb->transfer_buffer_length))
 472                 dev_vdbg(&acm->data->dev, "%s - len %d/%d, status %d\n",
 473                         __func__,
 474                         urb->actual_length,
 475                         urb->transfer_buffer_length,
 476                         status);
 477
 478         spin_lock_irqsave(&acm->write_lock, flags);
 479         acm_write_done(acm, wb);
 480         spin_unlock_irqrestore(&acm->write_lock, flags);
 481         schedule_work(&acm->work);
 482 }
 483
 484 static void acm_softint(struct work_struct *work)
 485 {
 486         struct acm *acm = container_of(work, struct acm, work);
 487
 488         dev_vdbg(&acm->data->dev, "%s\n", __func__);
 489
 490         tty_port_tty_wakeup(&acm->port);
 491 }
 492
 493 /*
 494  * TTY handlers
 495  */
 496
 497 static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
 498 {
 499         struct acm *acm;
 500         int retval;
 501
 502         dev_dbg(tty->dev, "%s\n", __func__);
 503
 504         acm = acm_get_by_minor(tty->index);
 505         if (!acm)
 506                 return -ENODEV;
 507
 508         retval = tty_standard_install(driver, tty);
 509         if (retval)
 510                 goto error_init_termios;
 511
 512         /*
 513          * Suppress initial echoing for some devices which might send data
 514          * immediately after acm driver has been installed.
 515          */
 516         if (acm->quirks & DISABLE_ECHO)
 517                 tty->termios.c_lflag &= ~ECHO;
 518
 519         tty->driver_data = acm;
 520
 521         return 0;
 522
 523 error_init_termios:
 524         tty_port_put(&acm->port);
 525         return retval;
 526 }
 527
 528 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
 529 {
 530         struct acm *acm = tty->driver_data;
 531
 532         dev_dbg(tty->dev, "%s\n", __func__);
 533
 534         return tty_port_open(&acm->port, tty, filp);
 535 }
 536
 537 static void acm_port_dtr_rts(struct tty_port *port, int raise)
 538 {
 539         struct acm *acm = container_of(port, struct acm, port);
 540         int val;
 541         int res;
 542
 543         if (raise)
 544                 val = ACM_CTRL_DTR | ACM_CTRL_RTS;
 545         else
 546                 val = 0;
 547
 548         /* FIXME: add missing ctrlout locking throughout driver */
 549         acm->ctrlout = val;
 550
 551         res = acm_set_control(acm, val);
 552         if (res && (acm->ctrl_caps & USB_CDC_CAP_LINE))
 553                 /* This is broken in too many devices to spam the logs */
 554                 dev_dbg(&acm->control->dev, "failed to set dtr/rts\n");
 555 }
 556
 557 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
 558 {
 559         struct acm *acm = container_of(port, struct acm, port);
 560         int retval = -ENODEV;
 561         int i;
 562
 563         dev_dbg(&acm->control->dev, "%s\n", __func__);
 564
 565         mutex_lock(&acm->mutex);
 566         if (acm->disconnected)
 567                 goto disconnected;
 568
 569         retval = usb_autopm_get_interface(acm->control);
 570         if (retval)
 571                 goto error_get_interface;
 572
 573         /*
 574          * FIXME: Why do we need this? Allocating 64K of physically contiguous
 575          * memory is really nasty...
 576          */
 577         set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
 578         acm->control->needs_remote_wakeup = 1;
 579
 580         acm->ctrlurb->dev = acm->dev;
 581         retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
 582         if (retval) {
 583                 dev_err(&acm->control->dev,
 584                         "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
 585                 goto error_submit_urb;
 586         }
 587
 588         acm_tty_set_termios(tty, NULL);
 589
 590         /*
 591          * Unthrottle device in case the TTY was closed while throttled.
 592          */
 593         spin_lock_irq(&acm->read_lock);
 594         acm->throttled = 0;
 595         acm->throttle_req = 0;
 596         spin_unlock_irq(&acm->read_lock);
 597
 598         retval = acm_submit_read_urbs(acm, GFP_KERNEL);
 599         if (retval)
 600                 goto error_submit_read_urbs;
 601
 602         usb_autopm_put_interface(acm->control);
 603
 604         mutex_unlock(&acm->mutex);
 605
 606         return 0;
 607
 608 error_submit_read_urbs:
 609         for (i = 0; i < acm->rx_buflimit; i++)
 610                 usb_kill_urb(acm->read_urbs[i]);
 611         usb_kill_urb(acm->ctrlurb);
 612 error_submit_urb:
 613         usb_autopm_put_interface(acm->control);
 614 error_get_interface:
 615 disconnected:
 616         mutex_unlock(&acm->mutex);
 617
 618         return usb_translate_errors(retval);
 619 }
 620
 621 static void acm_port_destruct(struct tty_port *port)
 622 {
 623         struct acm *acm = container_of(port, struct acm, port);
 624
 625         dev_dbg(&acm->control->dev, "%s\n", __func__);
 626
 627         acm_release_minor(acm);
 628         usb_put_intf(acm->control);
 629         kfree(acm->country_codes);
 630         kfree(acm);
 631 }
 632
 633 static void acm_port_shutdown(struct tty_port *port)
 634 {
 635         struct acm *acm = container_of(port, struct acm, port);
 636         struct urb *urb;
 637         struct acm_wb *wb;
 638         int i;
 639
 640         dev_dbg(&acm->control->dev, "%s\n", __func__);
 641
 642         /*
 643          * Need to grab write_lock to prevent race with resume, but no need to
 644          * hold it due to the tty-port initialised flag.
 645          */
 646         spin_lock_irq(&acm->write_lock);
 647         spin_unlock_irq(&acm->write_lock);
 648
 649         usb_autopm_get_interface_no_resume(acm->control);
 650         acm->control->needs_remote_wakeup = 0;
 651         usb_autopm_put_interface(acm->control);
 652
 653         for (;;) {
 654                 urb = usb_get_from_anchor(&acm->delayed);
 655                 if (!urb)
 656                         break;
 657                 wb = urb->context;
 658                 wb->use = 0;
 659                 usb_autopm_put_interface_async(acm->control);
 660         }
 661
 662         usb_kill_urb(acm->ctrlurb);
 663         for (i = 0; i < ACM_NW; i++)
 664                 usb_kill_urb(acm->wb[i].urb);
 665         for (i = 0; i < acm->rx_buflimit; i++)
 666                 usb_kill_urb(acm->read_urbs[i]);
 667 }
 668
 669 static void acm_tty_cleanup(struct tty_struct *tty)
 670 {
 671         struct acm *acm = tty->driver_data;
 672         dev_dbg(&acm->control->dev, "%s\n", __func__);
 673         tty_port_put(&acm->port);
 674 }
 675
 676 static void acm_tty_hangup(struct tty_struct *tty)
 677 {
 678         struct acm *acm = tty->driver_data;
 679         dev_dbg(&acm->control->dev, "%s\n", __func__);
 680         tty_port_hangup(&acm->port);
 681 }
 682
 683 static void acm_tty_close(struct tty_struct *tty, struct file *filp)
 684 {
 685         struct acm *acm = tty->driver_data;
 686         dev_dbg(&acm->control->dev, "%s\n", __func__);
 687         tty_port_close(&acm->port, tty, filp);
 688 }
 689
 690 static int acm_tty_write(struct tty_struct *tty,
 691                                         const unsigned char *buf, int count)
 692 {
 693         struct acm *acm = tty->driver_data;
 694         int stat;
 695         unsigned long flags;
 696         int wbn;
 697         struct acm_wb *wb;
 698
 699         if (!count)
 700                 return 0;
 701
 702         dev_vdbg(&acm->data->dev, "%s - count %d\n", __func__, count);
 703
 704         spin_lock_irqsave(&acm->write_lock, flags);
 705         wbn = acm_wb_alloc(acm);
 706         if (wbn < 0) {
 707                 spin_unlock_irqrestore(&acm->write_lock, flags);
 708                 return 0;
 709         }
 710         wb = &acm->wb[wbn];
 711
 712         if (!acm->dev) {
 713                 wb->use = 0;
 714                 spin_unlock_irqrestore(&acm->write_lock, flags);
 715                 return -ENODEV;
 716         }
 717
 718         count = (count > acm->writesize) ? acm->writesize : count;
 719         dev_vdbg(&acm->data->dev, "%s - write %d\n", __func__, count);
 720         memcpy(wb->buf, buf, count);
 721         wb->len = count;
 722
 723         stat = usb_autopm_get_interface_async(acm->control);
 724         if (stat) {
 725                 wb->use = 0;
 726                 spin_unlock_irqrestore(&acm->write_lock, flags);
 727                 return stat;
 728         }
 729
 730         if (acm->susp_count) {
 731                 usb_anchor_urb(wb->urb, &acm->delayed);
 732                 spin_unlock_irqrestore(&acm->write_lock, flags);
 733                 return count;
 734         }
 735
 736         stat = acm_start_wb(acm, wb);
 737         spin_unlock_irqrestore(&acm->write_lock, flags);
 738
 739         if (stat < 0)
 740                 return stat;
 741         return count;
 742 }
 743
 744 static int acm_tty_write_room(struct tty_struct *tty)
 745 {
 746         struct acm *acm = tty->driver_data;
 747         /*
 748          * Do not let the line discipline to know that we have a reserve,
 749          * or it might get too enthusiastic.
 750          */
 751         return acm_wb_is_avail(acm) ? acm->writesize : 0;
 752 }
 753
 754 static int acm_tty_chars_in_buffer(struct tty_struct *tty)
 755 {
 756         struct acm *acm = tty->driver_data;
 757         /*
 758          * if the device was unplugged then any remaining characters fell out
 759          * of the connector ;)
 760          */
 761         if (acm->disconnected)
 762                 return 0;
 763         /*
 764          * This is inaccurate (overcounts), but it works.
 765          */
 766         return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
 767 }
 768
 769 static void acm_tty_throttle(struct tty_struct *tty)
 770 {
 771         struct acm *acm = tty->driver_data;
 772
 773         spin_lock_irq(&acm->read_lock);
 774         acm->throttle_req = 1;
 775         spin_unlock_irq(&acm->read_lock);
 776 }
 777
 778 static void acm_tty_unthrottle(struct tty_struct *tty)
 779 {
 780         struct acm *acm = tty->driver_data;
 781         unsigned int was_throttled;
 782
 783         spin_lock_irq(&acm->read_lock);
 784         was_throttled = acm->throttled;
 785         acm->throttled = 0;
 786         acm->throttle_req = 0;
 787         spin_unlock_irq(&acm->read_lock);
 788
 789         if (was_throttled)
 790                 acm_submit_read_urbs(acm, GFP_KERNEL);
 791 }
 792
 793 static int acm_tty_break_ctl(struct tty_struct *tty, int state)
 794 {
 795         struct acm *acm = tty->driver_data;
 796         int retval;
 797
 798         retval = acm_send_break(acm, state ? 0xffff : 0);
 799         if (retval < 0)
 800                 dev_dbg(&acm->control->dev, "%s - send break failed\n",
 801                                                                 __func__);
 802         return retval;
 803 }
 804
 805 static int acm_tty_tiocmget(struct tty_struct *tty)
 806 {
 807         struct acm *acm = tty->driver_data;
 808
 809         return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
 810                (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
 811                (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
 812                (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
 813                (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
 814                TIOCM_CTS;
 815 }
 816
 817 static int acm_tty_tiocmset(struct tty_struct *tty,
 818                             unsigned int set, unsigned int clear)
 819 {
 820         struct acm *acm = tty->driver_data;
 821         unsigned int newctrl;
 822
 823         newctrl = acm->ctrlout;
 824         set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 825                                         (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 826         clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
 827                                         (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
 828
 829         newctrl = (newctrl & ~clear) | set;
 830
 831         if (acm->ctrlout == newctrl)
 832                 return 0;
 833         return acm_set_control(acm, acm->ctrlout = newctrl);
 834 }
 835
 836 static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
 837 {
 838         struct serial_struct tmp;
 839
 840         if (!info)
 841                 return -EINVAL;
 842
 843         memset(&tmp, 0, sizeof(tmp));
 844         tmp.flags = ASYNC_LOW_LATENCY;
 845         tmp.xmit_fifo_size = acm->writesize;
 846         tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
 847         tmp.close_delay = jiffies_to_msecs(acm->port.close_delay) / 10;
 848         tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 849                                 ASYNC_CLOSING_WAIT_NONE :
 850                                 jiffies_to_msecs(acm->port.closing_wait) / 10;
 851
 852         if (copy_to_user(info, &tmp, sizeof(tmp)))
 853                 return -EFAULT;
 854         else
 855                 return 0;
 856 }
 857
 858 static int set_serial_info(struct acm *acm,
 859                                 struct serial_struct __user *newinfo)
 860 {
 861         struct serial_struct new_serial;
 862         unsigned int closing_wait, close_delay;
 863         unsigned int old_closing_wait, old_close_delay;
 864         int retval = 0;
 865
 866         if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
 867                 return -EFAULT;
 868
 869         close_delay = msecs_to_jiffies(new_serial.close_delay * 10);
 870         closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 871                         ASYNC_CLOSING_WAIT_NONE :
 872                         msecs_to_jiffies(new_serial.closing_wait * 10);
 873
 874         /* we must redo the rounding here, so that the values match */
 875         old_close_delay = jiffies_to_msecs(acm->port.close_delay) / 10;
 876         old_closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
 877                                 ASYNC_CLOSING_WAIT_NONE :
 878                                 jiffies_to_msecs(acm->port.closing_wait) / 10;
 879
 880         mutex_lock(&acm->port.mutex);
 881
 882         if (!capable(CAP_SYS_ADMIN)) {
 883                 if ((new_serial.close_delay != old_close_delay) ||
 884                     (new_serial.closing_wait != old_closing_wait))
 885                         retval = -EPERM;
 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 wait_serial_change(struct acm *acm, unsigned long arg)
 896 {
 897         int rv = 0;
 898         DECLARE_WAITQUEUE(wait, current);
 899         struct async_icount old, new;
 900
 901         do {
 902                 spin_lock_irq(&acm->read_lock);
 903                 old = acm->oldcount;
 904                 new = acm->iocount;
 905                 acm->oldcount = new;
 906                 spin_unlock_irq(&acm->read_lock);
 907
 908                 if ((arg & TIOCM_DSR) &&
 909                         old.dsr != new.dsr)
 910                         break;
 911                 if ((arg & TIOCM_CD)  &&
 912                         old.dcd != new.dcd)
 913                         break;
 914                 if ((arg & TIOCM_RI) &&
 915                         old.rng != new.rng)
 916                         break;
 917
 918                 add_wait_queue(&acm->wioctl, &wait);
 919                 set_current_state(TASK_INTERRUPTIBLE);
 920                 schedule();
 921                 remove_wait_queue(&acm->wioctl, &wait);
 922                 if (acm->disconnected) {
 923                         if (arg & TIOCM_CD)
 924                                 break;
 925                         else
 926                                 rv = -ENODEV;
 927                 } else {
 928                         if (signal_pending(current))
 929                                 rv = -ERESTARTSYS;
 930                 }
 931         } while (!rv);
 932
 933
 934
 935         return rv;
 936 }
 937
 938 static int get_serial_usage(struct acm *acm,
 939                             struct serial_icounter_struct __user *count)
 940 {
 941         struct serial_icounter_struct icount;
 942         int rv = 0;
 943
 944         memset(&icount, 0, sizeof(icount));
 945         icount.dsr = acm->iocount.dsr;
 946         icount.rng = acm->iocount.rng;
 947         icount.dcd = acm->iocount.dcd;
 948         icount.frame = acm->iocount.frame;
 949         icount.overrun = acm->iocount.overrun;
 950         icount.parity = acm->iocount.parity;
 951         icount.brk = acm->iocount.brk;
 952
 953         if (copy_to_user(count, &icount, sizeof(icount)) > 0)
 954                 rv = -EFAULT;
 955
 956         return rv;
 957 }
 958
 959 static int acm_tty_ioctl(struct tty_struct *tty,
 960                                         unsigned int cmd, unsigned long arg)
 961 {
 962         struct acm *acm = tty->driver_data;
 963         int rv = -ENOIOCTLCMD;
 964
 965         switch (cmd) {
 966         case TIOCGSERIAL: /* gets serial port data */
 967                 rv = get_serial_info(acm, (struct serial_struct __user *) arg);
 968                 break;
 969         case TIOCSSERIAL:
 970                 rv = set_serial_info(acm, (struct serial_struct __user *) arg);
 971                 break;
 972         case TIOCMIWAIT:
 973                 rv = usb_autopm_get_interface(acm->control);
 974                 if (rv < 0) {
 975                         rv = -EIO;
 976                         break;
 977                 }
 978                 rv = wait_serial_change(acm, arg);
 979                 usb_autopm_put_interface(acm->control);
 980                 break;
 981         case TIOCGICOUNT:
 982                 rv = get_serial_usage(acm, (struct serial_icounter_struct __user *) arg);
 983                 break;
 984         }
 985
 986         return rv;
 987 }
 988
 989 static void acm_tty_set_termios(struct tty_struct *tty,
 990                                                 struct ktermios *termios_old)
 991 {
 992         struct acm *acm = tty->driver_data;
 993         struct ktermios *termios = &tty->termios;
 994         struct usb_cdc_line_coding newline;
 995         int newctrl = acm->ctrlout;
 996
 997         newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
 998         newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
 999         newline.bParityType = termios->c_cflag & PARENB ?
1000                                 (termios->c_cflag & PARODD ? 1 : 2) +
1001                                 (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
1002         switch (termios->c_cflag & CSIZE) {
1003         case CS5:
1004                 newline.bDataBits = 5;
1005                 break;
1006         case CS6:
1007                 newline.bDataBits = 6;
1008                 break;
1009         case CS7:
1010                 newline.bDataBits = 7;
1011                 break;
1012         case CS8:
1013         default:
1014                 newline.bDataBits = 8;
1015                 break;
1016         }
1017         /* FIXME: Needs to clear unsupported bits in the termios */
1018         acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
1019
1020         if (C_BAUD(tty) == B0) {
1021                 newline.dwDTERate = acm->line.dwDTERate;
1022                 newctrl &= ~ACM_CTRL_DTR;
1023         } else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
1024                 newctrl |=  ACM_CTRL_DTR;
1025         }
1026
1027         if (newctrl != acm->ctrlout)
1028                 acm_set_control(acm, acm->ctrlout = newctrl);
1029
1030         if (memcmp(&acm->line, &newline, sizeof newline)) {
1031                 memcpy(&acm->line, &newline, sizeof newline);
1032                 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
1033                         __func__,
1034                         le32_to_cpu(newline.dwDTERate),
1035                         newline.bCharFormat, newline.bParityType,
1036                         newline.bDataBits);
1037                 acm_set_line(acm, &acm->line);
1038         }
1039 }
1040
1041 static const struct tty_port_operations acm_port_ops = {
1042         .dtr_rts = acm_port_dtr_rts,
1043         .shutdown = acm_port_shutdown,
1044         .activate = acm_port_activate,
1045         .destruct = acm_port_destruct,
1046 };
1047
1048 /*
1049  * USB probe and disconnect routines.
1050  */
1051
1052 /* Little helpers: write/read buffers free */
1053 static void acm_write_buffers_free(struct acm *acm)
1054 {
1055         int i;
1056         struct acm_wb *wb;
1057         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
1058
1059         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
1060                 usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah);
1061 }
1062
1063 static void acm_read_buffers_free(struct acm *acm)
1064 {
1065         struct usb_device *usb_dev = interface_to_usbdev(acm->control);
1066         int i;
1067
1068         for (i = 0; i < acm->rx_buflimit; i++)
1069                 usb_free_coherent(usb_dev, acm->readsize,
1070                           acm->read_buffers[i].base, acm->read_buffers[i].dma);
1071 }
1072
1073 /* Little helper: write buffers allocate */
1074 static int acm_write_buffers_alloc(struct acm *acm)
1075 {
1076         int i;
1077         struct acm_wb *wb;
1078
1079         for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
1080                 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
1081                     &wb->dmah);
1082                 if (!wb->buf) {
1083                         while (i != 0) {
1084                                 --i;
1085                                 --wb;
1086                                 usb_free_coherent(acm->dev, acm->writesize,
1087                                     wb->buf, wb->dmah);
1088                         }
1089                         return -ENOMEM;
1090                 }
1091         }
1092         return 0;
1093 }
1094
1095 static int acm_probe(struct usb_interface *intf,
1096                      const struct usb_device_id *id)
1097 {
1098         struct usb_cdc_union_desc *union_header = NULL;
1099         struct usb_cdc_country_functional_desc *cfd = NULL;
1100         unsigned char *buffer = intf->altsetting->extra;
1101         int buflen = intf->altsetting->extralen;
1102         struct usb_interface *control_interface;
1103         struct usb_interface *data_interface;
1104         struct usb_endpoint_descriptor *epctrl = NULL;
1105         struct usb_endpoint_descriptor *epread = NULL;
1106         struct usb_endpoint_descriptor *epwrite = NULL;
1107         struct usb_device *usb_dev = interface_to_usbdev(intf);
1108         struct acm *acm;
1109         int minor;
1110         int ctrlsize, readsize;
1111         u8 *buf;
1112         u8 ac_management_function = 0;
1113         u8 call_management_function = 0;
1114         int call_interface_num = -1;
1115         int data_interface_num = -1;
1116         unsigned long quirks;
1117         int num_rx_buf;
1118         int i;
1119         unsigned int elength = 0;
1120         int combined_interfaces = 0;
1121         struct device *tty_dev;
1122         int rv = -ENOMEM;
1123
1124         /* normal quirks */
1125         quirks = (unsigned long)id->driver_info;
1126
1127         if (quirks == IGNORE_DEVICE)
1128                 return -ENODEV;
1129
1130         num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
1131
1132         /* handle quirks deadly to normal probing*/
1133         if (quirks == NO_UNION_NORMAL) {
1134                 data_interface = usb_ifnum_to_if(usb_dev, 1);
1135                 control_interface = usb_ifnum_to_if(usb_dev, 0);
1136                 /* we would crash */
1137                 if (!data_interface || !control_interface)
1138                         return -ENODEV;
1139                 goto skip_normal_probe;
1140         }
1141
1142         /* normal probing*/
1143         if (!buffer) {
1144                 dev_err(&intf->dev, "Weird descriptor references\n");
1145                 return -EINVAL;
1146         }
1147
1148         if (!buflen) {
1149                 if (intf->cur_altsetting->endpoint &&
1150                                 intf->cur_altsetting->endpoint->extralen &&
1151                                 intf->cur_altsetting->endpoint->extra) {
1152                         dev_dbg(&intf->dev,
1153                                 "Seeking extra descriptors on endpoint\n");
1154                         buflen = intf->cur_altsetting->endpoint->extralen;
1155                         buffer = intf->cur_altsetting->endpoint->extra;
1156                 } else {
1157                         dev_err(&intf->dev,
1158                                 "Zero length descriptor references\n");
1159                         return -EINVAL;
1160                 }
1161         }
1162
1163         while (buflen > 0) {
1164                 elength = buffer[0];
1165                 if (!elength) {
1166                         dev_err(&intf->dev, "skipping garbage byte\n");
1167                         elength = 1;
1168                         goto next_desc;
1169                 }
1170                 if (buffer[1] != USB_DT_CS_INTERFACE) {
1171                         dev_err(&intf->dev, "skipping garbage\n");
1172                         goto next_desc;
1173                 }
1174
1175                 switch (buffer[2]) {
1176                 case USB_CDC_UNION_TYPE: /* we've found it */
1177                         if (elength < sizeof(struct usb_cdc_union_desc))
1178                                 goto next_desc;
1179                         if (union_header) {
1180                                 dev_err(&intf->dev, "More than one "
1181                                         "union descriptor, skipping ...\n");
1182                                 goto next_desc;
1183                         }
1184                         union_header = (struct usb_cdc_union_desc *)buffer;
1185                         break;
1186                 case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/
1187                         if (elength < sizeof(struct usb_cdc_country_functional_desc))
1188                                 goto next_desc;
1189                         cfd = (struct usb_cdc_country_functional_desc *)buffer;
1190                         break;
1191                 case USB_CDC_HEADER_TYPE: /* maybe check version */
1192                         break; /* for now we ignore it */
1193                 case USB_CDC_ACM_TYPE:
1194                         if (elength < 4)
1195                                 goto next_desc;
1196                         ac_management_function = buffer[3];
1197                         break;
1198                 case USB_CDC_CALL_MANAGEMENT_TYPE:
1199                         if (elength < 5)
1200                                 goto next_desc;
1201                         call_management_function = buffer[3];
1202                         call_interface_num = buffer[4];
1203                         break;
1204                 default:
1205                         /*
1206                          * there are LOTS more CDC descriptors that
1207                          * could legitimately be found here.
1208                          */
1209                         dev_dbg(&intf->dev, "Ignoring descriptor: "
1210                                         "type %02x, length %ud\n",
1211                                         buffer[2], elength);
1212                         break;
1213                 }
1214 next_desc:
1215                 buflen -= elength;
1216                 buffer += elength;
1217         }
1218
1219         if (!union_header) {
1220                 if (call_interface_num > 0) {
1221                         dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
1222                         /* quirks for Droids MuIn LCD */
1223                         if (quirks & NO_DATA_INTERFACE)
1224                                 data_interface = usb_ifnum_to_if(usb_dev, 0);
1225                         else
1226                                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
1227                         control_interface = intf;
1228                 } else {
1229                         if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
1230                                 dev_dbg(&intf->dev,"No union descriptor, giving up\n");
1231                                 return -ENODEV;
1232                         } else {
1233                                 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
1234                                 combined_interfaces = 1;
1235                                 control_interface = data_interface = intf;
1236                                 goto look_for_collapsed_interface;
1237                         }
1238                 }
1239         } else {
1240                 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
1241                 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0));
1242         }
1243
1244         if (!control_interface || !data_interface) {
1245                 dev_dbg(&intf->dev, "no interfaces\n");
1246                 return -ENODEV;
1247         }
1248
1249         if (data_interface_num != call_interface_num)
1250                 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
1251
1252         if (control_interface == data_interface) {
1253                 /* some broken devices designed for windows work this way */
1254                 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
1255                 combined_interfaces = 1;
1256                 /* a popular other OS doesn't use it */
1257                 quirks |= NO_CAP_LINE;
1258                 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
1259                         dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
1260                         return -EINVAL;
1261                 }
1262 look_for_collapsed_interface:
1263                 for (i = 0; i < 3; i++) {
1264                         struct usb_endpoint_descriptor *ep;
1265                         ep = &data_interface->cur_altsetting->endpoint[i].desc;
1266
1267                         if (usb_endpoint_is_int_in(ep))
1268                                 epctrl = ep;
1269                         else if (usb_endpoint_is_bulk_out(ep))
1270                                 epwrite = ep;
1271                         else if (usb_endpoint_is_bulk_in(ep))
1272                                 epread = ep;
1273                         else
1274                                 return -EINVAL;
1275                 }
1276                 if (!epctrl || !epread || !epwrite)
1277                         return -ENODEV;
1278                 else
1279                         goto made_compressed_probe;
1280         }
1281
1282 skip_normal_probe:
1283
1284         /*workaround for switched interfaces */
1285         if (data_interface->cur_altsetting->desc.bInterfaceClass
1286                                                 != CDC_DATA_INTERFACE_TYPE) {
1287                 if (control_interface->cur_altsetting->desc.bInterfaceClass
1288                                                 == CDC_DATA_INTERFACE_TYPE) {
1289                         dev_dbg(&intf->dev,
1290                                 "Your device has switched interfaces.\n");
1291                         swap(control_interface, data_interface);
1292                 } else {
1293                         return -EINVAL;
1294                 }
1295         }
1296
1297         /* Accept probe requests only for the control interface */
1298         if (!combined_interfaces && intf != control_interface)
1299                 return -ENODEV;
1300
1301         if (!combined_interfaces && usb_interface_claimed(data_interface)) {
1302                 /* valid in this context */
1303                 dev_dbg(&intf->dev, "The data interface isn't available\n");
1304                 return -EBUSY;
1305         }
1306
1307
1308         if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
1309             control_interface->cur_altsetting->desc.bNumEndpoints == 0)
1310                 return -EINVAL;
1311
1312         epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
1313         epread = &data_interface->cur_altsetting->endpoint[0].desc;
1314         epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
1315
1316
1317         /* workaround for switched endpoints */
1318         if (!usb_endpoint_dir_in(epread)) {
1319                 /* descriptors are swapped */
1320                 dev_dbg(&intf->dev,
1321                         "The data interface has switched endpoints\n");
1322                 swap(epread, epwrite);
1323         }
1324 made_compressed_probe:
1325         dev_dbg(&intf->dev, "interfaces are valid\n");
1326
1327         acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
1328         if (acm == NULL)
1329                 goto alloc_fail;
1330
1331         ctrlsize = usb_endpoint_maxp(epctrl);
1332         readsize = usb_endpoint_maxp(epread) *
1333                                 (quirks == SINGLE_RX_URB ? 1 : 2);
1334         acm->combined_interfaces = combined_interfaces;
1335         acm->writesize = usb_endpoint_maxp(epwrite) * 20;
1336         acm->control = control_interface;
1337         acm->data = data_interface;
1338
1339         usb_get_intf(acm->control); /* undone in destruct() */
1340
1341         minor = acm_alloc_minor(acm);
1342         if (minor < 0) {
1343                 dev_err(&intf->dev, "no more free acm devices\n");
1344                 kfree(acm);
1345                 return -ENODEV;
1346         }
1347
1348         acm->minor = minor;
1349         acm->dev = usb_dev;
1350         acm->ctrl_caps = ac_management_function;
1351         if (quirks & NO_CAP_LINE)
1352                 acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
1353         acm->ctrlsize = ctrlsize;
1354         acm->readsize = readsize;
1355         acm->rx_buflimit = num_rx_buf;
1356         INIT_WORK(&acm->work, acm_softint);
1357         init_waitqueue_head(&acm->wioctl);
1358         spin_lock_init(&acm->write_lock);
1359         spin_lock_init(&acm->read_lock);
1360         mutex_init(&acm->mutex);
1361         acm->is_int_ep = usb_endpoint_xfer_int(epread);
1362         if (acm->is_int_ep)
1363                 acm->bInterval = epread->bInterval;
1364         tty_port_init(&acm->port);
1365         acm->port.ops = &acm_port_ops;
1366         init_usb_anchor(&acm->delayed);
1367         acm->quirks = quirks;
1368
1369         buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
1370         if (!buf)
1371                 goto alloc_fail2;
1372         acm->ctrl_buffer = buf;
1373
1374         if (acm_write_buffers_alloc(acm) < 0)
1375                 goto alloc_fail4;
1376
1377         acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
1378         if (!acm->ctrlurb)
1379                 goto alloc_fail5;
1380
1381         for (i = 0; i < num_rx_buf; i++) {
1382                 struct acm_rb *rb = &(acm->read_buffers[i]);
1383                 struct urb *urb;
1384
1385                 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
1386                                                                 &rb->dma);
1387                 if (!rb->base)
1388                         goto alloc_fail6;
1389                 rb->index = i;
1390                 rb->instance = acm;
1391
1392                 urb = usb_alloc_urb(0, GFP_KERNEL);
1393                 if (!urb)
1394                         goto alloc_fail6;
1395
1396                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1397                 urb->transfer_dma = rb->dma;
1398                 if (acm->is_int_ep) {
1399                         usb_fill_int_urb(urb, acm->dev,
1400                                          usb_rcvintpipe(usb_dev, epread->bEndpointAddress),
1401                                          rb->base,
1402                                          acm->readsize,
1403                                          acm_read_bulk_callback, rb,
1404                                          acm->bInterval);
1405                 } else {
1406                         usb_fill_bulk_urb(urb, acm->dev,
1407                                           usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress),
1408                                           rb->base,
1409                                           acm->readsize,
1410                                           acm_read_bulk_callback, rb);
1411                 }
1412
1413                 acm->read_urbs[i] = urb;
1414                 __set_bit(i, &acm->read_urbs_free);
1415         }
1416         for (i = 0; i < ACM_NW; i++) {
1417                 struct acm_wb *snd = &(acm->wb[i]);
1418
1419                 snd->urb = usb_alloc_urb(0, GFP_KERNEL);
1420                 if (snd->urb == NULL)
1421                         goto alloc_fail7;
1422
1423                 if (usb_endpoint_xfer_int(epwrite))
1424                         usb_fill_int_urb(snd->urb, usb_dev,
1425                                 usb_sndintpipe(usb_dev, epwrite->bEndpointAddress),
1426                                 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
1427                 else
1428                         usb_fill_bulk_urb(snd->urb, usb_dev,
1429                                 usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
1430                                 NULL, acm->writesize, acm_write_bulk, snd);
1431                 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1432                 if (quirks & SEND_ZERO_PACKET)
1433                         snd->urb->transfer_flags |= URB_ZERO_PACKET;
1434                 snd->instance = acm;
1435         }
1436
1437         usb_set_intfdata(intf, acm);
1438
1439         i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
1440         if (i < 0)
1441                 goto alloc_fail7;
1442
1443         if (cfd) { /* export the country data */
1444                 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
1445                 if (!acm->country_codes)
1446                         goto skip_countries;
1447                 acm->country_code_size = cfd->bLength - 4;
1448                 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
1449                                                         cfd->bLength - 4);
1450                 acm->country_rel_date = cfd->iCountryCodeRelDate;
1451
1452                 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
1453                 if (i < 0) {
1454                         kfree(acm->country_codes);
1455                         acm->country_codes = NULL;
1456                         acm->country_code_size = 0;
1457                         goto skip_countries;
1458                 }
1459
1460                 i = device_create_file(&intf->dev,
1461                                                 &dev_attr_iCountryCodeRelDate);
1462                 if (i < 0) {
1463                         device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1464                         kfree(acm->country_codes);
1465                         acm->country_codes = NULL;
1466                         acm->country_code_size = 0;
1467                         goto skip_countries;
1468                 }
1469         }
1470
1471 skip_countries:
1472         usb_fill_int_urb(acm->ctrlurb, usb_dev,
1473                          usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
1474                          acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
1475                          /* works around buggy devices */
1476                          epctrl->bInterval ? epctrl->bInterval : 16);
1477         acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1478         acm->ctrlurb->transfer_dma = acm->ctrl_dma;
1479
1480         dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
1481
1482         acm->line.dwDTERate = cpu_to_le32(9600);
1483         acm->line.bDataBits = 8;
1484         acm_set_line(acm, &acm->line);
1485
1486         usb_driver_claim_interface(&acm_driver, data_interface, acm);
1487         usb_set_intfdata(data_interface, acm);
1488
1489         tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
1490                         &control_interface->dev);
1491         if (IS_ERR(tty_dev)) {
1492                 rv = PTR_ERR(tty_dev);
1493                 goto alloc_fail8;
1494         }
1495
1496         if (quirks & CLEAR_HALT_CONDITIONS) {
1497                 usb_clear_halt(usb_dev, usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress));
1498                 usb_clear_halt(usb_dev, usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress));
1499         }
1500
1501         return 0;
1502 alloc_fail8:
1503         if (!acm->combined_interfaces) {
1504                 /* Clear driver data so that disconnect() returns early. */
1505                 usb_set_intfdata(data_interface, NULL);
1506                 usb_driver_release_interface(&acm_driver, data_interface);
1507         }
1508         if (acm->country_codes) {
1509                 device_remove_file(&acm->control->dev,
1510                                 &dev_attr_wCountryCodes);
1511                 device_remove_file(&acm->control->dev,
1512                                 &dev_attr_iCountryCodeRelDate);
1513                 kfree(acm->country_codes);
1514         }
1515         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1516 alloc_fail7:
1517         usb_set_intfdata(intf, NULL);
1518         for (i = 0; i < ACM_NW; i++)
1519                 usb_free_urb(acm->wb[i].urb);
1520 alloc_fail6:
1521         for (i = 0; i < num_rx_buf; i++)
1522                 usb_free_urb(acm->read_urbs[i]);
1523         acm_read_buffers_free(acm);
1524         usb_free_urb(acm->ctrlurb);
1525 alloc_fail5:
1526         acm_write_buffers_free(acm);
1527 alloc_fail4:
1528         usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1529 alloc_fail2:
1530         acm_release_minor(acm);
1531         kfree(acm);
1532 alloc_fail:
1533         return rv;
1534 }
1535
1536 static void stop_data_traffic(struct acm *acm)
1537 {
1538         int i;
1539
1540         dev_dbg(&acm->control->dev, "%s\n", __func__);
1541
1542         usb_kill_urb(acm->ctrlurb);
1543         for (i = 0; i < ACM_NW; i++)
1544                 usb_kill_urb(acm->wb[i].urb);
1545         for (i = 0; i < acm->rx_buflimit; i++)
1546                 usb_kill_urb(acm->read_urbs[i]);
1547
1548         cancel_work_sync(&acm->work);
1549 }
1550
1551 static void acm_disconnect(struct usb_interface *intf)
1552 {
1553         struct acm *acm = usb_get_intfdata(intf);
1554         struct usb_device *usb_dev = interface_to_usbdev(intf);
1555         struct tty_struct *tty;
1556         int i;
1557
1558         dev_dbg(&intf->dev, "%s\n", __func__);
1559
1560         /* sibling interface is already cleaning up */
1561         if (!acm)
1562                 return;
1563
1564         mutex_lock(&acm->mutex);
1565         acm->disconnected = true;
1566         if (acm->country_codes) {
1567                 device_remove_file(&acm->control->dev,
1568                                 &dev_attr_wCountryCodes);
1569                 device_remove_file(&acm->control->dev,
1570                                 &dev_attr_iCountryCodeRelDate);
1571         }
1572         wake_up_all(&acm->wioctl);
1573         device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
1574         usb_set_intfdata(acm->control, NULL);
1575         usb_set_intfdata(acm->data, NULL);
1576         mutex_unlock(&acm->mutex);
1577
1578         tty = tty_port_tty_get(&acm->port);
1579         if (tty) {
1580                 tty_vhangup(tty);
1581                 tty_kref_put(tty);
1582         }
1583
1584         stop_data_traffic(acm);
1585
1586         tty_unregister_device(acm_tty_driver, acm->minor);
1587
1588         usb_free_urb(acm->ctrlurb);
1589         for (i = 0; i < ACM_NW; i++)
1590                 usb_free_urb(acm->wb[i].urb);
1591         for (i = 0; i < acm->rx_buflimit; i++)
1592                 usb_free_urb(acm->read_urbs[i]);
1593         acm_write_buffers_free(acm);
1594         usb_free_coherent(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1595         acm_read_buffers_free(acm);
1596
1597         if (!acm->combined_interfaces)
1598                 usb_driver_release_interface(&acm_driver, intf == acm->control ?
1599                                         acm->data : acm->control);
1600
1601         tty_port_put(&acm->port);
1602 }
1603
1604 #ifdef CONFIG_PM
1605 static int acm_suspend(struct usb_interface *intf, pm_message_t message)
1606 {
1607         struct acm *acm = usb_get_intfdata(intf);
1608         int cnt;
1609
1610         spin_lock_irq(&acm->write_lock);
1611         if (PMSG_IS_AUTO(message)) {
1612                 if (acm->transmitting) {
1613                         spin_unlock_irq(&acm->write_lock);
1614                         return -EBUSY;
1615                 }
1616         }
1617         cnt = acm->susp_count++;
1618         spin_unlock_irq(&acm->write_lock);
1619
1620         if (cnt)
1621                 return 0;
1622
1623         stop_data_traffic(acm);
1624
1625         return 0;
1626 }
1627
1628 static int acm_resume(struct usb_interface *intf)
1629 {
1630         struct acm *acm = usb_get_intfdata(intf);
1631         struct urb *urb;
1632         int rv = 0;
1633
1634         spin_lock_irq(&acm->write_lock);
1635
1636         if (--acm->susp_count)
1637                 goto out;
1638
1639         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags)) {
1640                 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
1641
1642                 for (;;) {
1643                         urb = usb_get_from_anchor(&acm->delayed);
1644                         if (!urb)
1645                                 break;
1646
1647                         acm_start_wb(acm, urb->context);
1648                 }
1649
1650                 /*
1651                  * delayed error checking because we must
1652                  * do the write path at all cost
1653                  */
1654                 if (rv < 0)
1655                         goto out;
1656
1657                 rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
1658         }
1659 out:
1660         spin_unlock_irq(&acm->write_lock);
1661
1662         return rv;
1663 }
1664
1665 static int acm_reset_resume(struct usb_interface *intf)
1666 {
1667         struct acm *acm = usb_get_intfdata(intf);
1668
1669         if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
1670                 tty_port_tty_hangup(&acm->port, false);
1671
1672         return acm_resume(intf);
1673 }
1674
1675 #endif /* CONFIG_PM */
1676
1677 #define NOKIA_PCSUITE_ACM_INFO(x) \
1678                 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
1679                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1680                 USB_CDC_ACM_PROTO_VENDOR)
1681
1682 #define SAMSUNG_PCSUITE_ACM_INFO(x) \
1683                 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
1684                 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
1685                 USB_CDC_ACM_PROTO_VENDOR)
1686
1687 /*
1688  * USB driver structure.
1689  */
1690
1691 static const struct usb_device_id acm_ids[] = {
1692         /* quirky and broken devices */
1693         { USB_DEVICE(0x0424, 0x274e), /* Microchip Technology, Inc. (formerly SMSC) */
1694           .driver_info = DISABLE_ECHO, }, /* DISABLE ECHO in termios flag */
1695         { USB_DEVICE(0x076d, 0x0006), /* Denso Cradle CU-321 */
1696         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1697         { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
1698         .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
1699         { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
1700         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1701         },
1702         { USB_DEVICE(0x045b, 0x023c),   /* Renesas USB Download mode */
1703         .driver_info = DISABLE_ECHO,    /* Don't echo banner */
1704         },
1705         { USB_DEVICE(0x045b, 0x0248),   /* Renesas USB Download mode */
1706         .driver_info = DISABLE_ECHO,    /* Don't echo banner */
1707         },
1708         { USB_DEVICE(0x045b, 0x024D),   /* Renesas USB Download mode */
1709         .driver_info = DISABLE_ECHO,    /* Don't echo banner */
1710         },
1711         { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
1712         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1713         },
1714         { USB_DEVICE(0x0e8d, 0x2000), /* MediaTek Inc Preloader */
1715         .driver_info = DISABLE_ECHO, /* DISABLE ECHO in termios flag */
1716         },
1717         { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
1718         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1719         },
1720         { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
1721         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1722         },
1723         { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
1724         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1725         },
1726         { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
1727         .driver_info = SINGLE_RX_URB,
1728         },
1729         { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
1730         .driver_info = SINGLE_RX_URB, /* firmware bug */
1731         },
1732         { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
1733         .driver_info = SINGLE_RX_URB, /* firmware bug */
1734         },
1735         { USB_DEVICE(0x11ca, 0x0201), /* VeriFone Mx870 Gadget Serial */
1736         .driver_info = SINGLE_RX_URB,
1737         },
1738         { USB_DEVICE(0x1965, 0x0018), /* Uniden UBC125XLT */
1739         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1740         },
1741         { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
1742         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1743         },
1744         { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
1745         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1746         },
1747         { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
1748         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1749         },
1750         { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
1751         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1752         },
1753         { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
1754         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1755         },
1756         { USB_DEVICE(0x0572, 0x1349), /* Hiro (Conexant) USB MODEM H50228 */
1757         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
1758         },
1759         { USB_DEVICE(0x20df, 0x0001), /* Simtec Electronics Entropy Key */
1760         .driver_info = QUIRK_CONTROL_LINE_STATE, },
1761         { USB_DEVICE(0x2184, 0x001c) }, /* GW Instek AFG-2225 */
1762         { USB_DEVICE(0x2184, 0x0036) }, /* GW Instek AFG-125 */
1763         { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
1764         },
1765         /* Motorola H24 HSPA module: */
1766         { USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
1767         { USB_DEVICE(0x22b8, 0x2d92),   /* modem           + diagnostics        */
1768         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1769         },
1770         { USB_DEVICE(0x22b8, 0x2d93),   /* modem + AT port                      */
1771         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1772         },
1773         { USB_DEVICE(0x22b8, 0x2d95),   /* modem + AT port + diagnostics        */
1774         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1775         },
1776         { USB_DEVICE(0x22b8, 0x2d96),   /* modem                         + NMEA */
1777         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1778         },
1779         { USB_DEVICE(0x22b8, 0x2d97),   /* modem           + diagnostics + NMEA */
1780         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1781         },
1782         { USB_DEVICE(0x22b8, 0x2d99),   /* modem + AT port               + NMEA */
1783         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1784         },
1785         { USB_DEVICE(0x22b8, 0x2d9a),   /* modem + AT port + diagnostics + NMEA */
1786         .driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
1787         },
1788
1789         { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
1790         .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
1791                                            data interface instead of
1792                                            communications interface.
1793                                            Maybe we should define a new
1794                                            quirk for this. */
1795         },
1796         { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
1797         .driver_info = NO_UNION_NORMAL,
1798         },
1799         { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
1800         .driver_info = NO_UNION_NORMAL,
1801         },
1802         { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
1803         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1804         },
1805         { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
1806         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1807         },
1808         { USB_DEVICE(0xfff0, 0x0100), /* DATECS FP-2000 */
1809         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1810         },
1811         { USB_DEVICE(0x09d8, 0x0320), /* Elatec GmbH TWN3 */
1812         .driver_info = NO_UNION_NORMAL, /* has misplaced union descriptor */
1813         },
1814         { USB_DEVICE(0x0ca6, 0xa050), /* Castles VEGA3000 */
1815         .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
1816         },
1817
1818         { USB_DEVICE(0x2912, 0x0001), /* ATOL FPrint */
1819         .driver_info = CLEAR_HALT_CONDITIONS,
1820         },
1821
1822         /* Nokia S60 phones expose two ACM channels. The first is
1823          * a modem and is picked up by the standard AT-command
1824          * information below. The second is 'vendor-specific' but
1825          * is treated as a serial device at the S60 end, so we want
1826          * to expose it on Linux too. */
1827         { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
1828         { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
1829         { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
1830         { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
1831         { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
1832         { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
1833         { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
1834         { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
1835         { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
1836         { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
1837         { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
1838         { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
1839         { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
1840         { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
1841         { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
1842         { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
1843         { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
1844         { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
1845         { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
1846         { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
1847         { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
1848         { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
1849         { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
1850         { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
1851         { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
1852         { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
1853         { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
1854         { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
1855         { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
1856         { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
1857         { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
1858         { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
1859         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1860         { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
1861         { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
1862         { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
1863         { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
1864         { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
1865         { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
1866         { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
1867         { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
1868         { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
1869         { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
1870         { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
1871         { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
1872         { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
1873         { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
1874         { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
1875         { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
1876         { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
1877         { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
1878         { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
1879         { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
1880         { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
1881         { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
1882         { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
1883         { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
1884         { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
1885
1886         /* Support for Owen devices */
1887         { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
1888
1889         /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
1890
1891         /* Support for Droids MuIn LCD */
1892         { USB_DEVICE(0x04d8, 0x000b),
1893         .driver_info = NO_DATA_INTERFACE,
1894         },
1895
1896 #if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
1897         { USB_DEVICE(0x04d8, 0x0082),   /* Application mode */
1898         .driver_info = IGNORE_DEVICE,
1899         },
1900         { USB_DEVICE(0x04d8, 0x0083),   /* Bootloader mode */
1901         .driver_info = IGNORE_DEVICE,
1902         },
1903
1904         { USB_DEVICE(0x04d8, 0xf58b),
1905         .driver_info = IGNORE_DEVICE,
1906         },
1907 #endif
1908
1909         /*Samsung phone in firmware update mode */
1910         { USB_DEVICE(0x04e8, 0x685d),
1911         .driver_info = IGNORE_DEVICE,
1912         },
1913
1914         /* Exclude Infineon Flash Loader utility */
1915         { USB_DEVICE(0x058b, 0x0041),
1916         .driver_info = IGNORE_DEVICE,
1917         },
1918
1919         /* Exclude ETAS ES58x */
1920         { USB_DEVICE(0x108c, 0x0159), /* ES581.4 */
1921         .driver_info = IGNORE_DEVICE,
1922         },
1923         { USB_DEVICE(0x108c, 0x0168), /* ES582.1 */
1924         .driver_info = IGNORE_DEVICE,
1925         },
1926         { USB_DEVICE(0x108c, 0x0169), /* ES584.1 */
1927         .driver_info = IGNORE_DEVICE,
1928         },
1929
1930         { USB_DEVICE(0x1bc7, 0x0021), /* Telit 3G ACM only composition */
1931         .driver_info = SEND_ZERO_PACKET,
1932         },
1933         { USB_DEVICE(0x1bc7, 0x0023), /* Telit 3G ACM + ECM composition */
1934         .driver_info = SEND_ZERO_PACKET,
1935         },
1936
1937         /* Exclude Goodix Fingerprint Reader */
1938         { USB_DEVICE(0x27c6, 0x5395),
1939         .driver_info = IGNORE_DEVICE,
1940         },
1941
1942         /* Exclude Heimann Sensor GmbH USB appset demo */
1943         { USB_DEVICE(0x32a7, 0x0000),
1944         .driver_info = IGNORE_DEVICE,
1945         },
1946
1947         /* control interfaces without any protocol set */
1948         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1949                 USB_CDC_PROTO_NONE) },
1950
1951         /* control interfaces with various AT-command sets */
1952         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1953                 USB_CDC_ACM_PROTO_AT_V25TER) },
1954         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1955                 USB_CDC_ACM_PROTO_AT_PCCA101) },
1956         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1957                 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
1958         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1959                 USB_CDC_ACM_PROTO_AT_GSM) },
1960         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1961                 USB_CDC_ACM_PROTO_AT_3G) },
1962         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
1963                 USB_CDC_ACM_PROTO_AT_CDMA) },
1964
1965         { USB_DEVICE(0x1519, 0x0452), /* Intel 7260 modem */
1966         .driver_info = SEND_ZERO_PACKET,
1967         },
1968
1969         { }
1970 };
1971
1972 MODULE_DEVICE_TABLE(usb, acm_ids);
1973
1974 static struct usb_driver acm_driver = {
1975         .name =         "cdc_acm",
1976         .probe =        acm_probe,
1977         .disconnect =   acm_disconnect,
1978 #ifdef CONFIG_PM
1979         .suspend =      acm_suspend,
1980         .resume =       acm_resume,
1981         .reset_resume = acm_reset_resume,
1982 #endif
1983         .id_table =     acm_ids,
1984 #ifdef CONFIG_PM
1985         .supports_autosuspend = 1,
1986 #endif
1987         .disable_hub_initiated_lpm = 1,
1988 };
1989
1990 /*
1991  * TTY driver structures.
1992  */
1993
1994 static const struct tty_operations acm_ops = {
1995         .install =              acm_tty_install,
1996         .open =                 acm_tty_open,
1997         .close =                acm_tty_close,
1998         .cleanup =              acm_tty_cleanup,
1999         .hangup =               acm_tty_hangup,
2000         .write =                acm_tty_write,
2001         .write_room =           acm_tty_write_room,
2002         .ioctl =                acm_tty_ioctl,
2003         .throttle =             acm_tty_throttle,
2004         .unthrottle =           acm_tty_unthrottle,
2005         .chars_in_buffer =      acm_tty_chars_in_buffer,
2006         .break_ctl =            acm_tty_break_ctl,
2007         .set_termios =          acm_tty_set_termios,
2008         .tiocmget =             acm_tty_tiocmget,
2009         .tiocmset =             acm_tty_tiocmset,
2010 };
2011
2012 /*
2013  * Init / exit.
2014  */
2015
2016 static int __init acm_init(void)
2017 {
2018         int retval;
2019         acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
2020         if (!acm_tty_driver)
2021                 return -ENOMEM;
2022         acm_tty_driver->driver_name = "acm",
2023         acm_tty_driver->name = "ttyACM",
2024         acm_tty_driver->major = ACM_TTY_MAJOR,
2025         acm_tty_driver->minor_start = 0,
2026         acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
2027         acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
2028         acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
2029         acm_tty_driver->init_termios = tty_std_termios;
2030         acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
2031                                                                 HUPCL | CLOCAL;
2032         tty_set_operations(acm_tty_driver, &acm_ops);
2033
2034         retval = tty_register_driver(acm_tty_driver);
2035         if (retval) {
2036                 put_tty_driver(acm_tty_driver);
2037                 return retval;
2038         }
2039
2040         retval = usb_register(&acm_driver);
2041         if (retval) {
2042                 tty_unregister_driver(acm_tty_driver);
2043                 put_tty_driver(acm_tty_driver);
2044                 return retval;
2045         }
2046
2047         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
2048
2049         return 0;
2050 }
2051
2052 static void __exit acm_exit(void)
2053 {
2054         usb_deregister(&acm_driver);
2055         tty_unregister_driver(acm_tty_driver);
2056         put_tty_driver(acm_tty_driver);
2057         idr_destroy(&acm_minors);
2058 }
2059
2060 module_init(acm_init);
2061 module_exit(acm_exit);
2062
2063 MODULE_AUTHOR(DRIVER_AUTHOR);
2064 MODULE_DESCRIPTION(DRIVER_DESC);
2065 MODULE_LICENSE("GPL");
2066 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);