cdc-acm.c revision 5a6a62bdb9257aa74ab0ad2b2c8a33b0f9b17ce4
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 57static struct usb_driver acm_driver; 58static struct tty_driver *acm_tty_driver; 59static struct acm *acm_table[ACM_TTY_MINORS]; 60 61static 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 */ 71static 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 */ 94static 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'. */ 111static 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 122static 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 150static 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 169static 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 */ 185static 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 198static 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; 208 209 rc = usb_submit_urb(wb->urb, GFP_ATOMIC); 210 if (rc < 0) { 211 dev_err(&acm->data->dev, 212 "%s - usb_submit_urb(write bulk) failed: %d\n", 213 __func__, rc); 214 acm_write_done(acm, wb); 215 } 216 return rc; 217} 218 219/* 220 * attributes exported through sysfs 221 */ 222static ssize_t show_caps 223(struct device *dev, struct device_attribute *attr, char *buf) 224{ 225 struct usb_interface *intf = to_usb_interface(dev); 226 struct acm *acm = usb_get_intfdata(intf); 227 228 return sprintf(buf, "%d", acm->ctrl_caps); 229} 230static DEVICE_ATTR(bmCapabilities, S_IRUGO, show_caps, NULL); 231 232static ssize_t show_country_codes 233(struct device *dev, struct device_attribute *attr, char *buf) 234{ 235 struct usb_interface *intf = to_usb_interface(dev); 236 struct acm *acm = usb_get_intfdata(intf); 237 238 memcpy(buf, acm->country_codes, acm->country_code_size); 239 return acm->country_code_size; 240} 241 242static DEVICE_ATTR(wCountryCodes, S_IRUGO, show_country_codes, NULL); 243 244static ssize_t show_country_rel_date 245(struct device *dev, struct device_attribute *attr, char *buf) 246{ 247 struct usb_interface *intf = to_usb_interface(dev); 248 struct acm *acm = usb_get_intfdata(intf); 249 250 return sprintf(buf, "%d", acm->country_rel_date); 251} 252 253static DEVICE_ATTR(iCountryCodeRelDate, S_IRUGO, show_country_rel_date, NULL); 254/* 255 * Interrupt handlers for various ACM device responses 256 */ 257 258/* control interface reports status changes with "interrupt" transfers */ 259static void acm_ctrl_irq(struct urb *urb) 260{ 261 struct acm *acm = urb->context; 262 struct usb_cdc_notification *dr = urb->transfer_buffer; 263 unsigned char *data; 264 int newctrl; 265 int difference; 266 int retval; 267 int status = urb->status; 268 269 switch (status) { 270 case 0: 271 /* success */ 272 break; 273 case -ECONNRESET: 274 case -ENOENT: 275 case -ESHUTDOWN: 276 /* this urb is terminated, clean up */ 277 dev_dbg(&acm->control->dev, 278 "%s - urb shutting down with status: %d\n", 279 __func__, status); 280 return; 281 default: 282 dev_dbg(&acm->control->dev, 283 "%s - nonzero urb status received: %d\n", 284 __func__, status); 285 goto exit; 286 } 287 288 usb_mark_last_busy(acm->dev); 289 290 data = (unsigned char *)(dr + 1); 291 switch (dr->bNotificationType) { 292 case USB_CDC_NOTIFY_NETWORK_CONNECTION: 293 dev_dbg(&acm->control->dev, "%s - network connection: %d\n", 294 __func__, dr->wValue); 295 break; 296 297 case USB_CDC_NOTIFY_SERIAL_STATE: 298 newctrl = get_unaligned_le16(data); 299 300 if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) { 301 dev_dbg(&acm->control->dev, "%s - calling hangup\n", 302 __func__); 303 tty_port_tty_hangup(&acm->port, false); 304 } 305 306 difference = acm->ctrlin ^ newctrl; 307 spin_lock(&acm->read_lock); 308 acm->ctrlin = newctrl; 309 acm->oldcount = acm->iocount; 310 311 if (difference & ACM_CTRL_DSR) 312 acm->iocount.dsr++; 313 if (difference & ACM_CTRL_BRK) 314 acm->iocount.brk++; 315 if (difference & ACM_CTRL_RI) 316 acm->iocount.rng++; 317 if (difference & ACM_CTRL_DCD) 318 acm->iocount.dcd++; 319 if (difference & ACM_CTRL_FRAMING) 320 acm->iocount.frame++; 321 if (difference & ACM_CTRL_PARITY) 322 acm->iocount.parity++; 323 if (difference & ACM_CTRL_OVERRUN) 324 acm->iocount.overrun++; 325 spin_unlock(&acm->read_lock); 326 327 if (difference) 328 wake_up_all(&acm->wioctl); 329 330 break; 331 332 default: 333 dev_dbg(&acm->control->dev, 334 "%s - unknown notification %d received: index %d " 335 "len %d data0 %d data1 %d\n", 336 __func__, 337 dr->bNotificationType, dr->wIndex, 338 dr->wLength, data[0], data[1]); 339 break; 340 } 341exit: 342 retval = usb_submit_urb(urb, GFP_ATOMIC); 343 if (retval) 344 dev_err(&acm->control->dev, "%s - usb_submit_urb failed: %d\n", 345 __func__, retval); 346} 347 348static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags) 349{ 350 int res; 351 352 if (!test_and_clear_bit(index, &acm->read_urbs_free)) 353 return 0; 354 355 dev_vdbg(&acm->data->dev, "%s - urb %d\n", __func__, index); 356 357 res = usb_submit_urb(acm->read_urbs[index], mem_flags); 358 if (res) { 359 if (res != -EPERM) { 360 dev_err(&acm->data->dev, 361 "%s - usb_submit_urb failed: %d\n", 362 __func__, res); 363 } 364 set_bit(index, &acm->read_urbs_free); 365 return res; 366 } 367 368 return 0; 369} 370 371static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags) 372{ 373 int res; 374 int i; 375 376 for (i = 0; i < acm->rx_buflimit; ++i) { 377 res = acm_submit_read_urb(acm, i, mem_flags); 378 if (res) 379 return res; 380 } 381 382 return 0; 383} 384 385static void acm_process_read_urb(struct acm *acm, struct urb *urb) 386{ 387 if (!urb->actual_length) 388 return; 389 390 tty_insert_flip_string(&acm->port, urb->transfer_buffer, 391 urb->actual_length); 392 tty_flip_buffer_push(&acm->port); 393} 394 395static void acm_read_bulk_callback(struct urb *urb) 396{ 397 struct acm_rb *rb = urb->context; 398 struct acm *acm = rb->instance; 399 unsigned long flags; 400 401 dev_vdbg(&acm->data->dev, "%s - urb %d, len %d\n", __func__, 402 rb->index, urb->actual_length); 403 set_bit(rb->index, &acm->read_urbs_free); 404 405 if (!acm->dev) { 406 dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__); 407 return; 408 } 409 usb_mark_last_busy(acm->dev); 410 411 if (urb->status) { 412 dev_dbg(&acm->data->dev, "%s - non-zero urb status: %d\n", 413 __func__, urb->status); 414 return; 415 } 416 acm_process_read_urb(acm, urb); 417 418 /* throttle device if requested by tty */ 419 spin_lock_irqsave(&acm->read_lock, flags); 420 acm->throttled = acm->throttle_req; 421 if (!acm->throttled && !acm->susp_count) { 422 spin_unlock_irqrestore(&acm->read_lock, flags); 423 acm_submit_read_urb(acm, rb->index, GFP_ATOMIC); 424 } else { 425 spin_unlock_irqrestore(&acm->read_lock, flags); 426 } 427} 428 429/* data interface wrote those outgoing bytes */ 430static void acm_write_bulk(struct urb *urb) 431{ 432 struct acm_wb *wb = urb->context; 433 struct acm *acm = wb->instance; 434 unsigned long flags; 435 436 if (urb->status || (urb->actual_length != urb->transfer_buffer_length)) 437 dev_vdbg(&acm->data->dev, "%s - len %d/%d, status %d\n", 438 __func__, 439 urb->actual_length, 440 urb->transfer_buffer_length, 441 urb->status); 442 443 spin_lock_irqsave(&acm->write_lock, flags); 444 acm_write_done(acm, wb); 445 spin_unlock_irqrestore(&acm->write_lock, flags); 446 schedule_work(&acm->work); 447} 448 449static void acm_softint(struct work_struct *work) 450{ 451 struct acm *acm = container_of(work, struct acm, work); 452 453 dev_vdbg(&acm->data->dev, "%s\n", __func__); 454 455 tty_port_tty_wakeup(&acm->port); 456} 457 458/* 459 * TTY handlers 460 */ 461 462static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty) 463{ 464 struct acm *acm; 465 int retval; 466 467 dev_dbg(tty->dev, "%s\n", __func__); 468 469 acm = acm_get_by_index(tty->index); 470 if (!acm) 471 return -ENODEV; 472 473 retval = tty_standard_install(driver, tty); 474 if (retval) 475 goto error_init_termios; 476 477 tty->driver_data = acm; 478 479 return 0; 480 481error_init_termios: 482 tty_port_put(&acm->port); 483 return retval; 484} 485 486static int acm_tty_open(struct tty_struct *tty, struct file *filp) 487{ 488 struct acm *acm = tty->driver_data; 489 490 dev_dbg(tty->dev, "%s\n", __func__); 491 492 return tty_port_open(&acm->port, tty, filp); 493} 494 495static int acm_port_activate(struct tty_port *port, struct tty_struct *tty) 496{ 497 struct acm *acm = container_of(port, struct acm, port); 498 int retval = -ENODEV; 499 500 dev_dbg(&acm->control->dev, "%s\n", __func__); 501 502 mutex_lock(&acm->mutex); 503 if (acm->disconnected) 504 goto disconnected; 505 506 retval = usb_autopm_get_interface(acm->control); 507 if (retval) 508 goto error_get_interface; 509 510 /* 511 * FIXME: Why do we need this? Allocating 64K of physically contiguous 512 * memory is really nasty... 513 */ 514 set_bit(TTY_NO_WRITE_SPLIT, &tty->flags); 515 acm->control->needs_remote_wakeup = 1; 516 517 acm->ctrlurb->dev = acm->dev; 518 if (usb_submit_urb(acm->ctrlurb, GFP_KERNEL)) { 519 dev_err(&acm->control->dev, 520 "%s - usb_submit_urb(ctrl irq) failed\n", __func__); 521 goto error_submit_urb; 522 } 523 524 acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS; 525 if (acm_set_control(acm, acm->ctrlout) < 0 && 526 (acm->ctrl_caps & USB_CDC_CAP_LINE)) 527 goto error_set_control; 528 529 usb_autopm_put_interface(acm->control); 530 531 /* 532 * Unthrottle device in case the TTY was closed while throttled. 533 */ 534 spin_lock_irq(&acm->read_lock); 535 acm->throttled = 0; 536 acm->throttle_req = 0; 537 spin_unlock_irq(&acm->read_lock); 538 539 if (acm_submit_read_urbs(acm, GFP_KERNEL)) 540 goto error_submit_read_urbs; 541 542 mutex_unlock(&acm->mutex); 543 544 return 0; 545 546error_submit_read_urbs: 547 acm->ctrlout = 0; 548 acm_set_control(acm, acm->ctrlout); 549error_set_control: 550 usb_kill_urb(acm->ctrlurb); 551error_submit_urb: 552 usb_autopm_put_interface(acm->control); 553error_get_interface: 554disconnected: 555 mutex_unlock(&acm->mutex); 556 return retval; 557} 558 559static void acm_port_destruct(struct tty_port *port) 560{ 561 struct acm *acm = container_of(port, struct acm, port); 562 563 dev_dbg(&acm->control->dev, "%s\n", __func__); 564 565 acm_release_minor(acm); 566 usb_put_intf(acm->control); 567 kfree(acm->country_codes); 568 kfree(acm); 569} 570 571static void acm_port_shutdown(struct tty_port *port) 572{ 573 struct acm *acm = container_of(port, struct acm, port); 574 int i; 575 576 dev_dbg(&acm->control->dev, "%s\n", __func__); 577 578 mutex_lock(&acm->mutex); 579 if (!acm->disconnected) { 580 usb_autopm_get_interface(acm->control); 581 acm_set_control(acm, acm->ctrlout = 0); 582 usb_kill_urb(acm->ctrlurb); 583 for (i = 0; i < ACM_NW; i++) 584 usb_kill_urb(acm->wb[i].urb); 585 for (i = 0; i < acm->rx_buflimit; i++) 586 usb_kill_urb(acm->read_urbs[i]); 587 acm->control->needs_remote_wakeup = 0; 588 usb_autopm_put_interface(acm->control); 589 } 590 mutex_unlock(&acm->mutex); 591} 592 593static void acm_tty_cleanup(struct tty_struct *tty) 594{ 595 struct acm *acm = tty->driver_data; 596 dev_dbg(&acm->control->dev, "%s\n", __func__); 597 tty_port_put(&acm->port); 598} 599 600static void acm_tty_hangup(struct tty_struct *tty) 601{ 602 struct acm *acm = tty->driver_data; 603 dev_dbg(&acm->control->dev, "%s\n", __func__); 604 tty_port_hangup(&acm->port); 605} 606 607static void acm_tty_close(struct tty_struct *tty, struct file *filp) 608{ 609 struct acm *acm = tty->driver_data; 610 dev_dbg(&acm->control->dev, "%s\n", __func__); 611 tty_port_close(&acm->port, tty, filp); 612} 613 614static int acm_tty_write(struct tty_struct *tty, 615 const unsigned char *buf, int count) 616{ 617 struct acm *acm = tty->driver_data; 618 int stat; 619 unsigned long flags; 620 int wbn; 621 struct acm_wb *wb; 622 623 if (!count) 624 return 0; 625 626 dev_vdbg(&acm->data->dev, "%s - count %d\n", __func__, count); 627 628 spin_lock_irqsave(&acm->write_lock, flags); 629 wbn = acm_wb_alloc(acm); 630 if (wbn < 0) { 631 spin_unlock_irqrestore(&acm->write_lock, flags); 632 return 0; 633 } 634 wb = &acm->wb[wbn]; 635 636 if (!acm->dev) { 637 wb->use = 0; 638 spin_unlock_irqrestore(&acm->write_lock, flags); 639 return -ENODEV; 640 } 641 642 count = (count > acm->writesize) ? acm->writesize : count; 643 dev_vdbg(&acm->data->dev, "%s - write %d\n", __func__, count); 644 memcpy(wb->buf, buf, count); 645 wb->len = count; 646 647 usb_autopm_get_interface_async(acm->control); 648 if (acm->susp_count) { 649 if (!acm->delayed_wb) 650 acm->delayed_wb = wb; 651 else 652 usb_autopm_put_interface_async(acm->control); 653 spin_unlock_irqrestore(&acm->write_lock, flags); 654 return count; /* A white lie */ 655 } 656 usb_mark_last_busy(acm->dev); 657 658 stat = acm_start_wb(acm, wb); 659 spin_unlock_irqrestore(&acm->write_lock, flags); 660 661 if (stat < 0) 662 return stat; 663 return count; 664} 665 666static int acm_tty_write_room(struct tty_struct *tty) 667{ 668 struct acm *acm = tty->driver_data; 669 /* 670 * Do not let the line discipline to know that we have a reserve, 671 * or it might get too enthusiastic. 672 */ 673 return acm_wb_is_avail(acm) ? acm->writesize : 0; 674} 675 676static int acm_tty_chars_in_buffer(struct tty_struct *tty) 677{ 678 struct acm *acm = tty->driver_data; 679 /* 680 * if the device was unplugged then any remaining characters fell out 681 * of the connector ;) 682 */ 683 if (acm->disconnected) 684 return 0; 685 /* 686 * This is inaccurate (overcounts), but it works. 687 */ 688 return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize; 689} 690 691static void acm_tty_throttle(struct tty_struct *tty) 692{ 693 struct acm *acm = tty->driver_data; 694 695 spin_lock_irq(&acm->read_lock); 696 acm->throttle_req = 1; 697 spin_unlock_irq(&acm->read_lock); 698} 699 700static void acm_tty_unthrottle(struct tty_struct *tty) 701{ 702 struct acm *acm = tty->driver_data; 703 unsigned int was_throttled; 704 705 spin_lock_irq(&acm->read_lock); 706 was_throttled = acm->throttled; 707 acm->throttled = 0; 708 acm->throttle_req = 0; 709 spin_unlock_irq(&acm->read_lock); 710 711 if (was_throttled) 712 acm_submit_read_urbs(acm, GFP_KERNEL); 713} 714 715static int acm_tty_break_ctl(struct tty_struct *tty, int state) 716{ 717 struct acm *acm = tty->driver_data; 718 int retval; 719 720 retval = acm_send_break(acm, state ? 0xffff : 0); 721 if (retval < 0) 722 dev_dbg(&acm->control->dev, "%s - send break failed\n", 723 __func__); 724 return retval; 725} 726 727static int acm_tty_tiocmget(struct tty_struct *tty) 728{ 729 struct acm *acm = tty->driver_data; 730 731 return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) | 732 (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) | 733 (acm->ctrlin & ACM_CTRL_DSR ? TIOCM_DSR : 0) | 734 (acm->ctrlin & ACM_CTRL_RI ? TIOCM_RI : 0) | 735 (acm->ctrlin & ACM_CTRL_DCD ? TIOCM_CD : 0) | 736 TIOCM_CTS; 737} 738 739static int acm_tty_tiocmset(struct tty_struct *tty, 740 unsigned int set, unsigned int clear) 741{ 742 struct acm *acm = tty->driver_data; 743 unsigned int newctrl; 744 745 newctrl = acm->ctrlout; 746 set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) | 747 (set & TIOCM_RTS ? ACM_CTRL_RTS : 0); 748 clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) | 749 (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0); 750 751 newctrl = (newctrl & ~clear) | set; 752 753 if (acm->ctrlout == newctrl) 754 return 0; 755 return acm_set_control(acm, acm->ctrlout = newctrl); 756} 757 758static int get_serial_info(struct acm *acm, struct serial_struct __user *info) 759{ 760 struct serial_struct tmp; 761 762 if (!info) 763 return -EINVAL; 764 765 memset(&tmp, 0, sizeof(tmp)); 766 tmp.flags = ASYNC_LOW_LATENCY; 767 tmp.xmit_fifo_size = acm->writesize; 768 tmp.baud_base = le32_to_cpu(acm->line.dwDTERate); 769 tmp.close_delay = acm->port.close_delay / 10; 770 tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ? 771 ASYNC_CLOSING_WAIT_NONE : 772 acm->port.closing_wait / 10; 773 774 if (copy_to_user(info, &tmp, sizeof(tmp))) 775 return -EFAULT; 776 else 777 return 0; 778} 779 780static int set_serial_info(struct acm *acm, 781 struct serial_struct __user *newinfo) 782{ 783 struct serial_struct new_serial; 784 unsigned int closing_wait, close_delay; 785 int retval = 0; 786 787 if (copy_from_user(&new_serial, newinfo, sizeof(new_serial))) 788 return -EFAULT; 789 790 close_delay = new_serial.close_delay * 10; 791 closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ? 792 ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10; 793 794 mutex_lock(&acm->port.mutex); 795 796 if (!capable(CAP_SYS_ADMIN)) { 797 if ((close_delay != acm->port.close_delay) || 798 (closing_wait != acm->port.closing_wait)) 799 retval = -EPERM; 800 else 801 retval = -EOPNOTSUPP; 802 } else { 803 acm->port.close_delay = close_delay; 804 acm->port.closing_wait = closing_wait; 805 } 806 807 mutex_unlock(&acm->port.mutex); 808 return retval; 809} 810 811static int wait_serial_change(struct acm *acm, unsigned long arg) 812{ 813 int rv = 0; 814 DECLARE_WAITQUEUE(wait, current); 815 struct async_icount old, new; 816 817 if (arg & (TIOCM_DSR | TIOCM_RI | TIOCM_CD )) 818 return -EINVAL; 819 do { 820 spin_lock_irq(&acm->read_lock); 821 old = acm->oldcount; 822 new = acm->iocount; 823 acm->oldcount = new; 824 spin_unlock_irq(&acm->read_lock); 825 826 if ((arg & TIOCM_DSR) && 827 old.dsr != new.dsr) 828 break; 829 if ((arg & TIOCM_CD) && 830 old.dcd != new.dcd) 831 break; 832 if ((arg & TIOCM_RI) && 833 old.rng != new.rng) 834 break; 835 836 add_wait_queue(&acm->wioctl, &wait); 837 set_current_state(TASK_INTERRUPTIBLE); 838 schedule(); 839 remove_wait_queue(&acm->wioctl, &wait); 840 if (acm->disconnected) { 841 if (arg & TIOCM_CD) 842 break; 843 else 844 rv = -ENODEV; 845 } else { 846 if (signal_pending(current)) 847 rv = -ERESTARTSYS; 848 } 849 } while (!rv); 850 851 852 853 return rv; 854} 855 856static int acm_tty_ioctl(struct tty_struct *tty, 857 unsigned int cmd, unsigned long arg) 858{ 859 struct acm *acm = tty->driver_data; 860 int rv = -ENOIOCTLCMD; 861 862 switch (cmd) { 863 case TIOCGSERIAL: /* gets serial port data */ 864 rv = get_serial_info(acm, (struct serial_struct __user *) arg); 865 break; 866 case TIOCSSERIAL: 867 rv = set_serial_info(acm, (struct serial_struct __user *) arg); 868 break; 869 case TIOCMIWAIT: 870 rv = wait_serial_change(acm, arg); 871 break; 872 } 873 874 return rv; 875} 876 877static void acm_tty_set_termios(struct tty_struct *tty, 878 struct ktermios *termios_old) 879{ 880 struct acm *acm = tty->driver_data; 881 struct ktermios *termios = &tty->termios; 882 struct usb_cdc_line_coding newline; 883 int newctrl = acm->ctrlout; 884 885 newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty)); 886 newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0; 887 newline.bParityType = termios->c_cflag & PARENB ? 888 (termios->c_cflag & PARODD ? 1 : 2) + 889 (termios->c_cflag & CMSPAR ? 2 : 0) : 0; 890 switch (termios->c_cflag & CSIZE) { 891 case CS5: 892 newline.bDataBits = 5; 893 break; 894 case CS6: 895 newline.bDataBits = 6; 896 break; 897 case CS7: 898 newline.bDataBits = 7; 899 break; 900 case CS8: 901 default: 902 newline.bDataBits = 8; 903 break; 904 } 905 /* FIXME: Needs to clear unsupported bits in the termios */ 906 acm->clocal = ((termios->c_cflag & CLOCAL) != 0); 907 908 if (!newline.dwDTERate) { 909 newline.dwDTERate = acm->line.dwDTERate; 910 newctrl &= ~ACM_CTRL_DTR; 911 } else 912 newctrl |= ACM_CTRL_DTR; 913 914 if (newctrl != acm->ctrlout) 915 acm_set_control(acm, acm->ctrlout = newctrl); 916 917 if (memcmp(&acm->line, &newline, sizeof newline)) { 918 memcpy(&acm->line, &newline, sizeof newline); 919 dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n", 920 __func__, 921 le32_to_cpu(newline.dwDTERate), 922 newline.bCharFormat, newline.bParityType, 923 newline.bDataBits); 924 acm_set_line(acm, &acm->line); 925 } 926} 927 928static const struct tty_port_operations acm_port_ops = { 929 .shutdown = acm_port_shutdown, 930 .activate = acm_port_activate, 931 .destruct = acm_port_destruct, 932}; 933 934/* 935 * USB probe and disconnect routines. 936 */ 937 938/* Little helpers: write/read buffers free */ 939static void acm_write_buffers_free(struct acm *acm) 940{ 941 int i; 942 struct acm_wb *wb; 943 struct usb_device *usb_dev = interface_to_usbdev(acm->control); 944 945 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) 946 usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah); 947} 948 949static void acm_read_buffers_free(struct acm *acm) 950{ 951 struct usb_device *usb_dev = interface_to_usbdev(acm->control); 952 int i; 953 954 for (i = 0; i < acm->rx_buflimit; i++) 955 usb_free_coherent(usb_dev, acm->readsize, 956 acm->read_buffers[i].base, acm->read_buffers[i].dma); 957} 958 959/* Little helper: write buffers allocate */ 960static int acm_write_buffers_alloc(struct acm *acm) 961{ 962 int i; 963 struct acm_wb *wb; 964 965 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) { 966 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL, 967 &wb->dmah); 968 if (!wb->buf) { 969 while (i != 0) { 970 --i; 971 --wb; 972 usb_free_coherent(acm->dev, acm->writesize, 973 wb->buf, wb->dmah); 974 } 975 return -ENOMEM; 976 } 977 } 978 return 0; 979} 980 981static int acm_probe(struct usb_interface *intf, 982 const struct usb_device_id *id) 983{ 984 struct usb_cdc_union_desc *union_header = NULL; 985 struct usb_cdc_country_functional_desc *cfd = NULL; 986 unsigned char *buffer = intf->altsetting->extra; 987 int buflen = intf->altsetting->extralen; 988 struct usb_interface *control_interface; 989 struct usb_interface *data_interface; 990 struct usb_endpoint_descriptor *epctrl = NULL; 991 struct usb_endpoint_descriptor *epread = NULL; 992 struct usb_endpoint_descriptor *epwrite = NULL; 993 struct usb_device *usb_dev = interface_to_usbdev(intf); 994 struct acm *acm; 995 int minor; 996 int ctrlsize, readsize; 997 u8 *buf; 998 u8 ac_management_function = 0; 999 u8 call_management_function = 0; 1000 int call_interface_num = -1; 1001 int data_interface_num = -1; 1002 unsigned long quirks; 1003 int num_rx_buf; 1004 int i; 1005 int combined_interfaces = 0; 1006 struct device *tty_dev; 1007 int rv = -ENOMEM; 1008 1009 /* normal quirks */ 1010 quirks = (unsigned long)id->driver_info; 1011 1012 if (quirks == IGNORE_DEVICE) 1013 return -ENODEV; 1014 1015 num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR; 1016 1017 /* handle quirks deadly to normal probing*/ 1018 if (quirks == NO_UNION_NORMAL) { 1019 data_interface = usb_ifnum_to_if(usb_dev, 1); 1020 control_interface = usb_ifnum_to_if(usb_dev, 0); 1021 goto skip_normal_probe; 1022 } 1023 1024 /* normal probing*/ 1025 if (!buffer) { 1026 dev_err(&intf->dev, "Weird descriptor references\n"); 1027 return -EINVAL; 1028 } 1029 1030 if (!buflen) { 1031 if (intf->cur_altsetting->endpoint && 1032 intf->cur_altsetting->endpoint->extralen && 1033 intf->cur_altsetting->endpoint->extra) { 1034 dev_dbg(&intf->dev, 1035 "Seeking extra descriptors on endpoint\n"); 1036 buflen = intf->cur_altsetting->endpoint->extralen; 1037 buffer = intf->cur_altsetting->endpoint->extra; 1038 } else { 1039 dev_err(&intf->dev, 1040 "Zero length descriptor references\n"); 1041 return -EINVAL; 1042 } 1043 } 1044 1045 while (buflen > 0) { 1046 if (buffer[1] != USB_DT_CS_INTERFACE) { 1047 dev_err(&intf->dev, "skipping garbage\n"); 1048 goto next_desc; 1049 } 1050 1051 switch (buffer[2]) { 1052 case USB_CDC_UNION_TYPE: /* we've found it */ 1053 if (union_header) { 1054 dev_err(&intf->dev, "More than one " 1055 "union descriptor, skipping ...\n"); 1056 goto next_desc; 1057 } 1058 union_header = (struct usb_cdc_union_desc *)buffer; 1059 break; 1060 case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/ 1061 cfd = (struct usb_cdc_country_functional_desc *)buffer; 1062 break; 1063 case USB_CDC_HEADER_TYPE: /* maybe check version */ 1064 break; /* for now we ignore it */ 1065 case USB_CDC_ACM_TYPE: 1066 ac_management_function = buffer[3]; 1067 break; 1068 case USB_CDC_CALL_MANAGEMENT_TYPE: 1069 call_management_function = buffer[3]; 1070 call_interface_num = buffer[4]; 1071 if ((quirks & NOT_A_MODEM) == 0 && (call_management_function & 3) != 3) 1072 dev_err(&intf->dev, "This device cannot do calls on its own. It is not a modem.\n"); 1073 break; 1074 default: 1075 /* there are LOTS more CDC descriptors that 1076 * could legitimately be found here. 1077 */ 1078 dev_dbg(&intf->dev, "Ignoring descriptor: " 1079 "type %02x, length %d\n", 1080 buffer[2], buffer[0]); 1081 break; 1082 } 1083next_desc: 1084 buflen -= buffer[0]; 1085 buffer += buffer[0]; 1086 } 1087 1088 if (!union_header) { 1089 if (call_interface_num > 0) { 1090 dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n"); 1091 /* quirks for Droids MuIn LCD */ 1092 if (quirks & NO_DATA_INTERFACE) 1093 data_interface = usb_ifnum_to_if(usb_dev, 0); 1094 else 1095 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num)); 1096 control_interface = intf; 1097 } else { 1098 if (intf->cur_altsetting->desc.bNumEndpoints != 3) { 1099 dev_dbg(&intf->dev,"No union descriptor, giving up\n"); 1100 return -ENODEV; 1101 } else { 1102 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n"); 1103 combined_interfaces = 1; 1104 control_interface = data_interface = intf; 1105 goto look_for_collapsed_interface; 1106 } 1107 } 1108 } else { 1109 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0); 1110 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0)); 1111 if (!control_interface || !data_interface) { 1112 dev_dbg(&intf->dev, "no interfaces\n"); 1113 return -ENODEV; 1114 } 1115 } 1116 1117 if (data_interface_num != call_interface_num) 1118 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n"); 1119 1120 if (control_interface == data_interface) { 1121 /* some broken devices designed for windows work this way */ 1122 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n"); 1123 combined_interfaces = 1; 1124 /* a popular other OS doesn't use it */ 1125 quirks |= NO_CAP_LINE; 1126 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) { 1127 dev_err(&intf->dev, "This needs exactly 3 endpoints\n"); 1128 return -EINVAL; 1129 } 1130look_for_collapsed_interface: 1131 for (i = 0; i < 3; i++) { 1132 struct usb_endpoint_descriptor *ep; 1133 ep = &data_interface->cur_altsetting->endpoint[i].desc; 1134 1135 if (usb_endpoint_is_int_in(ep)) 1136 epctrl = ep; 1137 else if (usb_endpoint_is_bulk_out(ep)) 1138 epwrite = ep; 1139 else if (usb_endpoint_is_bulk_in(ep)) 1140 epread = ep; 1141 else 1142 return -EINVAL; 1143 } 1144 if (!epctrl || !epread || !epwrite) 1145 return -ENODEV; 1146 else 1147 goto made_compressed_probe; 1148 } 1149 1150skip_normal_probe: 1151 1152 /*workaround for switched interfaces */ 1153 if (data_interface->cur_altsetting->desc.bInterfaceClass 1154 != CDC_DATA_INTERFACE_TYPE) { 1155 if (control_interface->cur_altsetting->desc.bInterfaceClass 1156 == CDC_DATA_INTERFACE_TYPE) { 1157 struct usb_interface *t; 1158 dev_dbg(&intf->dev, 1159 "Your device has switched interfaces.\n"); 1160 t = control_interface; 1161 control_interface = data_interface; 1162 data_interface = t; 1163 } else { 1164 return -EINVAL; 1165 } 1166 } 1167 1168 /* Accept probe requests only for the control interface */ 1169 if (!combined_interfaces && intf != control_interface) 1170 return -ENODEV; 1171 1172 if (!combined_interfaces && usb_interface_claimed(data_interface)) { 1173 /* valid in this context */ 1174 dev_dbg(&intf->dev, "The data interface isn't available\n"); 1175 return -EBUSY; 1176 } 1177 1178 1179 if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 || 1180 control_interface->cur_altsetting->desc.bNumEndpoints == 0) 1181 return -EINVAL; 1182 1183 epctrl = &control_interface->cur_altsetting->endpoint[0].desc; 1184 epread = &data_interface->cur_altsetting->endpoint[0].desc; 1185 epwrite = &data_interface->cur_altsetting->endpoint[1].desc; 1186 1187 1188 /* workaround for switched endpoints */ 1189 if (!usb_endpoint_dir_in(epread)) { 1190 /* descriptors are swapped */ 1191 struct usb_endpoint_descriptor *t; 1192 dev_dbg(&intf->dev, 1193 "The data interface has switched endpoints\n"); 1194 t = epread; 1195 epread = epwrite; 1196 epwrite = t; 1197 } 1198made_compressed_probe: 1199 dev_dbg(&intf->dev, "interfaces are valid\n"); 1200 1201 acm = kzalloc(sizeof(struct acm), GFP_KERNEL); 1202 if (acm == NULL) { 1203 dev_err(&intf->dev, "out of memory (acm kzalloc)\n"); 1204 goto alloc_fail; 1205 } 1206 1207 minor = acm_alloc_minor(acm); 1208 if (minor == ACM_TTY_MINORS) { 1209 dev_err(&intf->dev, "no more free acm devices\n"); 1210 kfree(acm); 1211 return -ENODEV; 1212 } 1213 1214 ctrlsize = usb_endpoint_maxp(epctrl); 1215 readsize = usb_endpoint_maxp(epread) * 1216 (quirks == SINGLE_RX_URB ? 1 : 2); 1217 acm->combined_interfaces = combined_interfaces; 1218 acm->writesize = usb_endpoint_maxp(epwrite) * 20; 1219 acm->control = control_interface; 1220 acm->data = data_interface; 1221 acm->minor = minor; 1222 acm->dev = usb_dev; 1223 acm->ctrl_caps = ac_management_function; 1224 if (quirks & NO_CAP_LINE) 1225 acm->ctrl_caps &= ~USB_CDC_CAP_LINE; 1226 acm->ctrlsize = ctrlsize; 1227 acm->readsize = readsize; 1228 acm->rx_buflimit = num_rx_buf; 1229 INIT_WORK(&acm->work, acm_softint); 1230 init_waitqueue_head(&acm->wioctl); 1231 spin_lock_init(&acm->write_lock); 1232 spin_lock_init(&acm->read_lock); 1233 mutex_init(&acm->mutex); 1234 acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress); 1235 acm->is_int_ep = usb_endpoint_xfer_int(epread); 1236 if (acm->is_int_ep) 1237 acm->bInterval = epread->bInterval; 1238 tty_port_init(&acm->port); 1239 acm->port.ops = &acm_port_ops; 1240 1241 buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma); 1242 if (!buf) { 1243 dev_err(&intf->dev, "out of memory (ctrl buffer alloc)\n"); 1244 goto alloc_fail2; 1245 } 1246 acm->ctrl_buffer = buf; 1247 1248 if (acm_write_buffers_alloc(acm) < 0) { 1249 dev_err(&intf->dev, "out of memory (write buffer alloc)\n"); 1250 goto alloc_fail4; 1251 } 1252 1253 acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL); 1254 if (!acm->ctrlurb) { 1255 dev_err(&intf->dev, "out of memory (ctrlurb kmalloc)\n"); 1256 goto alloc_fail5; 1257 } 1258 for (i = 0; i < num_rx_buf; i++) { 1259 struct acm_rb *rb = &(acm->read_buffers[i]); 1260 struct urb *urb; 1261 1262 rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL, 1263 &rb->dma); 1264 if (!rb->base) { 1265 dev_err(&intf->dev, "out of memory " 1266 "(read bufs usb_alloc_coherent)\n"); 1267 goto alloc_fail6; 1268 } 1269 rb->index = i; 1270 rb->instance = acm; 1271 1272 urb = usb_alloc_urb(0, GFP_KERNEL); 1273 if (!urb) { 1274 dev_err(&intf->dev, 1275 "out of memory (read urbs usb_alloc_urb)\n"); 1276 goto alloc_fail6; 1277 } 1278 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 1279 urb->transfer_dma = rb->dma; 1280 if (acm->is_int_ep) { 1281 usb_fill_int_urb(urb, acm->dev, 1282 acm->rx_endpoint, 1283 rb->base, 1284 acm->readsize, 1285 acm_read_bulk_callback, rb, 1286 acm->bInterval); 1287 } else { 1288 usb_fill_bulk_urb(urb, acm->dev, 1289 acm->rx_endpoint, 1290 rb->base, 1291 acm->readsize, 1292 acm_read_bulk_callback, rb); 1293 } 1294 1295 acm->read_urbs[i] = urb; 1296 __set_bit(i, &acm->read_urbs_free); 1297 } 1298 for (i = 0; i < ACM_NW; i++) { 1299 struct acm_wb *snd = &(acm->wb[i]); 1300 1301 snd->urb = usb_alloc_urb(0, GFP_KERNEL); 1302 if (snd->urb == NULL) { 1303 dev_err(&intf->dev, 1304 "out of memory (write urbs usb_alloc_urb)\n"); 1305 goto alloc_fail7; 1306 } 1307 1308 if (usb_endpoint_xfer_int(epwrite)) 1309 usb_fill_int_urb(snd->urb, usb_dev, 1310 usb_sndintpipe(usb_dev, epwrite->bEndpointAddress), 1311 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval); 1312 else 1313 usb_fill_bulk_urb(snd->urb, usb_dev, 1314 usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress), 1315 NULL, acm->writesize, acm_write_bulk, snd); 1316 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 1317 snd->instance = acm; 1318 } 1319 1320 usb_set_intfdata(intf, acm); 1321 1322 i = device_create_file(&intf->dev, &dev_attr_bmCapabilities); 1323 if (i < 0) 1324 goto alloc_fail7; 1325 1326 if (cfd) { /* export the country data */ 1327 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL); 1328 if (!acm->country_codes) 1329 goto skip_countries; 1330 acm->country_code_size = cfd->bLength - 4; 1331 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0, 1332 cfd->bLength - 4); 1333 acm->country_rel_date = cfd->iCountryCodeRelDate; 1334 1335 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes); 1336 if (i < 0) { 1337 kfree(acm->country_codes); 1338 acm->country_codes = NULL; 1339 acm->country_code_size = 0; 1340 goto skip_countries; 1341 } 1342 1343 i = device_create_file(&intf->dev, 1344 &dev_attr_iCountryCodeRelDate); 1345 if (i < 0) { 1346 device_remove_file(&intf->dev, &dev_attr_wCountryCodes); 1347 kfree(acm->country_codes); 1348 acm->country_codes = NULL; 1349 acm->country_code_size = 0; 1350 goto skip_countries; 1351 } 1352 } 1353 1354skip_countries: 1355 usb_fill_int_urb(acm->ctrlurb, usb_dev, 1356 usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress), 1357 acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm, 1358 /* works around buggy devices */ 1359 epctrl->bInterval ? epctrl->bInterval : 16); 1360 acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 1361 acm->ctrlurb->transfer_dma = acm->ctrl_dma; 1362 1363 dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor); 1364 1365 acm_set_control(acm, acm->ctrlout); 1366 1367 acm->line.dwDTERate = cpu_to_le32(9600); 1368 acm->line.bDataBits = 8; 1369 acm_set_line(acm, &acm->line); 1370 1371 usb_driver_claim_interface(&acm_driver, data_interface, acm); 1372 usb_set_intfdata(data_interface, acm); 1373 1374 usb_get_intf(control_interface); 1375 tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor, 1376 &control_interface->dev); 1377 if (IS_ERR(tty_dev)) { 1378 rv = PTR_ERR(tty_dev); 1379 goto alloc_fail8; 1380 } 1381 1382 return 0; 1383alloc_fail8: 1384 if (acm->country_codes) { 1385 device_remove_file(&acm->control->dev, 1386 &dev_attr_wCountryCodes); 1387 device_remove_file(&acm->control->dev, 1388 &dev_attr_iCountryCodeRelDate); 1389 } 1390 device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities); 1391alloc_fail7: 1392 usb_set_intfdata(intf, NULL); 1393 for (i = 0; i < ACM_NW; i++) 1394 usb_free_urb(acm->wb[i].urb); 1395alloc_fail6: 1396 for (i = 0; i < num_rx_buf; i++) 1397 usb_free_urb(acm->read_urbs[i]); 1398 acm_read_buffers_free(acm); 1399 usb_free_urb(acm->ctrlurb); 1400alloc_fail5: 1401 acm_write_buffers_free(acm); 1402alloc_fail4: 1403 usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma); 1404alloc_fail2: 1405 acm_release_minor(acm); 1406 kfree(acm); 1407alloc_fail: 1408 return rv; 1409} 1410 1411static void stop_data_traffic(struct acm *acm) 1412{ 1413 int i; 1414 1415 dev_dbg(&acm->control->dev, "%s\n", __func__); 1416 1417 usb_kill_urb(acm->ctrlurb); 1418 for (i = 0; i < ACM_NW; i++) 1419 usb_kill_urb(acm->wb[i].urb); 1420 for (i = 0; i < acm->rx_buflimit; i++) 1421 usb_kill_urb(acm->read_urbs[i]); 1422 1423 cancel_work_sync(&acm->work); 1424} 1425 1426static void acm_disconnect(struct usb_interface *intf) 1427{ 1428 struct acm *acm = usb_get_intfdata(intf); 1429 struct usb_device *usb_dev = interface_to_usbdev(intf); 1430 struct tty_struct *tty; 1431 int i; 1432 1433 dev_dbg(&intf->dev, "%s\n", __func__); 1434 1435 /* sibling interface is already cleaning up */ 1436 if (!acm) 1437 return; 1438 1439 mutex_lock(&acm->mutex); 1440 acm->disconnected = true; 1441 if (acm->country_codes) { 1442 device_remove_file(&acm->control->dev, 1443 &dev_attr_wCountryCodes); 1444 device_remove_file(&acm->control->dev, 1445 &dev_attr_iCountryCodeRelDate); 1446 } 1447 wake_up_all(&acm->wioctl); 1448 device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities); 1449 usb_set_intfdata(acm->control, NULL); 1450 usb_set_intfdata(acm->data, NULL); 1451 mutex_unlock(&acm->mutex); 1452 1453 tty = tty_port_tty_get(&acm->port); 1454 if (tty) { 1455 tty_vhangup(tty); 1456 tty_kref_put(tty); 1457 } 1458 1459 stop_data_traffic(acm); 1460 1461 tty_unregister_device(acm_tty_driver, acm->minor); 1462 1463 usb_free_urb(acm->ctrlurb); 1464 for (i = 0; i < ACM_NW; i++) 1465 usb_free_urb(acm->wb[i].urb); 1466 for (i = 0; i < acm->rx_buflimit; i++) 1467 usb_free_urb(acm->read_urbs[i]); 1468 acm_write_buffers_free(acm); 1469 usb_free_coherent(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma); 1470 acm_read_buffers_free(acm); 1471 1472 if (!acm->combined_interfaces) 1473 usb_driver_release_interface(&acm_driver, intf == acm->control ? 1474 acm->data : acm->control); 1475 1476 tty_port_put(&acm->port); 1477} 1478 1479#ifdef CONFIG_PM 1480static int acm_suspend(struct usb_interface *intf, pm_message_t message) 1481{ 1482 struct acm *acm = usb_get_intfdata(intf); 1483 int cnt; 1484 1485 if (PMSG_IS_AUTO(message)) { 1486 int b; 1487 1488 spin_lock_irq(&acm->write_lock); 1489 b = acm->transmitting; 1490 spin_unlock_irq(&acm->write_lock); 1491 if (b) 1492 return -EBUSY; 1493 } 1494 1495 spin_lock_irq(&acm->read_lock); 1496 spin_lock(&acm->write_lock); 1497 cnt = acm->susp_count++; 1498 spin_unlock(&acm->write_lock); 1499 spin_unlock_irq(&acm->read_lock); 1500 1501 if (cnt) 1502 return 0; 1503 1504 if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags)) 1505 stop_data_traffic(acm); 1506 1507 return 0; 1508} 1509 1510static int acm_resume(struct usb_interface *intf) 1511{ 1512 struct acm *acm = usb_get_intfdata(intf); 1513 struct acm_wb *wb; 1514 int rv = 0; 1515 int cnt; 1516 1517 spin_lock_irq(&acm->read_lock); 1518 acm->susp_count -= 1; 1519 cnt = acm->susp_count; 1520 spin_unlock_irq(&acm->read_lock); 1521 1522 if (cnt) 1523 return 0; 1524 1525 if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags)) { 1526 rv = usb_submit_urb(acm->ctrlurb, GFP_NOIO); 1527 1528 spin_lock_irq(&acm->write_lock); 1529 if (acm->delayed_wb) { 1530 wb = acm->delayed_wb; 1531 acm->delayed_wb = NULL; 1532 spin_unlock_irq(&acm->write_lock); 1533 acm_start_wb(acm, wb); 1534 } else { 1535 spin_unlock_irq(&acm->write_lock); 1536 } 1537 1538 /* 1539 * delayed error checking because we must 1540 * do the write path at all cost 1541 */ 1542 if (rv < 0) 1543 goto err_out; 1544 1545 rv = acm_submit_read_urbs(acm, GFP_NOIO); 1546 } 1547 1548err_out: 1549 return rv; 1550} 1551 1552static int acm_reset_resume(struct usb_interface *intf) 1553{ 1554 struct acm *acm = usb_get_intfdata(intf); 1555 1556 if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags)) 1557 tty_port_tty_hangup(&acm->port, false); 1558 1559 return acm_resume(intf); 1560} 1561 1562#endif /* CONFIG_PM */ 1563 1564#define NOKIA_PCSUITE_ACM_INFO(x) \ 1565 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \ 1566 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \ 1567 USB_CDC_ACM_PROTO_VENDOR) 1568 1569#define SAMSUNG_PCSUITE_ACM_INFO(x) \ 1570 USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \ 1571 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \ 1572 USB_CDC_ACM_PROTO_VENDOR) 1573 1574/* 1575 * USB driver structure. 1576 */ 1577 1578static const struct usb_device_id acm_ids[] = { 1579 /* quirky and broken devices */ 1580 { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */ 1581 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */ 1582 }, 1583 { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */ 1584 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */ 1585 }, 1586 { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */ 1587 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */ 1588 }, 1589 { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */ 1590 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */ 1591 }, 1592 { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */ 1593 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */ 1594 }, 1595 { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */ 1596 .driver_info = SINGLE_RX_URB, 1597 }, 1598 { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */ 1599 .driver_info = SINGLE_RX_URB, /* firmware bug */ 1600 }, 1601 { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */ 1602 .driver_info = SINGLE_RX_URB, /* firmware bug */ 1603 }, 1604 { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */ 1605 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */ 1606 }, 1607 { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */ 1608 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */ 1609 }, 1610 { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */ 1611 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */ 1612 }, 1613 { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */ 1614 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */ 1615 }, 1616 { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */ 1617 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */ 1618 }, 1619 { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */ 1620 }, 1621 /* Motorola H24 HSPA module: */ 1622 { USB_DEVICE(0x22b8, 0x2d91) }, /* modem */ 1623 { USB_DEVICE(0x22b8, 0x2d92) }, /* modem + diagnostics */ 1624 { USB_DEVICE(0x22b8, 0x2d93) }, /* modem + AT port */ 1625 { USB_DEVICE(0x22b8, 0x2d95) }, /* modem + AT port + diagnostics */ 1626 { USB_DEVICE(0x22b8, 0x2d96) }, /* modem + NMEA */ 1627 { USB_DEVICE(0x22b8, 0x2d97) }, /* modem + diagnostics + NMEA */ 1628 { USB_DEVICE(0x22b8, 0x2d99) }, /* modem + AT port + NMEA */ 1629 { USB_DEVICE(0x22b8, 0x2d9a) }, /* modem + AT port + diagnostics + NMEA */ 1630 1631 { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */ 1632 .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on 1633 data interface instead of 1634 communications interface. 1635 Maybe we should define a new 1636 quirk for this. */ 1637 }, 1638 { USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */ 1639 .driver_info = NO_UNION_NORMAL, 1640 }, 1641 { USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */ 1642 .driver_info = NO_UNION_NORMAL, 1643 }, 1644 { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */ 1645 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */ 1646 }, 1647 { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */ 1648 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */ 1649 }, 1650 1651 /* Nokia S60 phones expose two ACM channels. The first is 1652 * a modem and is picked up by the standard AT-command 1653 * information below. The second is 'vendor-specific' but 1654 * is treated as a serial device at the S60 end, so we want 1655 * to expose it on Linux too. */ 1656 { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */ 1657 { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */ 1658 { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */ 1659 { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */ 1660 { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */ 1661 { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */ 1662 { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */ 1663 { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */ 1664 { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */ 1665 { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */ 1666 { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */ 1667 { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */ 1668 { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */ 1669 { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */ 1670 { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */ 1671 { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */ 1672 { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */ 1673 { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i */ 1674 { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */ 1675 { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */ 1676 { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */ 1677 { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic & */ 1678 { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */ 1679 { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */ 1680 { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */ 1681 { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */ 1682 { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */ 1683 { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */ 1684 { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */ 1685 { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */ 1686 { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */ 1687 { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB */ 1688 { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */ 1689 { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */ 1690 { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */ 1691 { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */ 1692 { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */ 1693 { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */ 1694 { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */ 1695 { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3 */ 1696 { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */ 1697 { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */ 1698 { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */ 1699 { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */ 1700 { NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */ 1701 { NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */ 1702 { NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */ 1703 { NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */ 1704 { NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */ 1705 { NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */ 1706 { NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */ 1707 { NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */ 1708 { NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */ 1709 { NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */ 1710 { NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */ 1711 { NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */ 1712 { NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */ 1713 { SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */ 1714 1715 /* Support for Owen devices */ 1716 { USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */ 1717 1718 /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */ 1719 1720 /* Support Lego NXT using pbLua firmware */ 1721 { USB_DEVICE(0x0694, 0xff00), 1722 .driver_info = NOT_A_MODEM, 1723 }, 1724 1725 /* Support for Droids MuIn LCD */ 1726 { USB_DEVICE(0x04d8, 0x000b), 1727 .driver_info = NO_DATA_INTERFACE, 1728 }, 1729 1730#if IS_ENABLED(CONFIG_INPUT_IMS_PCU) 1731 { USB_DEVICE(0x04d8, 0x0082), /* Application mode */ 1732 .driver_info = IGNORE_DEVICE, 1733 }, 1734 { USB_DEVICE(0x04d8, 0x0083), /* Bootloader mode */ 1735 .driver_info = IGNORE_DEVICE, 1736 }, 1737#endif 1738 1739 /* control interfaces without any protocol set */ 1740 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, 1741 USB_CDC_PROTO_NONE) }, 1742 1743 /* control interfaces with various AT-command sets */ 1744 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, 1745 USB_CDC_ACM_PROTO_AT_V25TER) }, 1746 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, 1747 USB_CDC_ACM_PROTO_AT_PCCA101) }, 1748 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, 1749 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) }, 1750 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, 1751 USB_CDC_ACM_PROTO_AT_GSM) }, 1752 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, 1753 USB_CDC_ACM_PROTO_AT_3G) }, 1754 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, 1755 USB_CDC_ACM_PROTO_AT_CDMA) }, 1756 1757 { } 1758}; 1759 1760MODULE_DEVICE_TABLE(usb, acm_ids); 1761 1762static struct usb_driver acm_driver = { 1763 .name = "cdc_acm", 1764 .probe = acm_probe, 1765 .disconnect = acm_disconnect, 1766#ifdef CONFIG_PM 1767 .suspend = acm_suspend, 1768 .resume = acm_resume, 1769 .reset_resume = acm_reset_resume, 1770#endif 1771 .id_table = acm_ids, 1772#ifdef CONFIG_PM 1773 .supports_autosuspend = 1, 1774#endif 1775 .disable_hub_initiated_lpm = 1, 1776}; 1777 1778/* 1779 * TTY driver structures. 1780 */ 1781 1782static const struct tty_operations acm_ops = { 1783 .install = acm_tty_install, 1784 .open = acm_tty_open, 1785 .close = acm_tty_close, 1786 .cleanup = acm_tty_cleanup, 1787 .hangup = acm_tty_hangup, 1788 .write = acm_tty_write, 1789 .write_room = acm_tty_write_room, 1790 .ioctl = acm_tty_ioctl, 1791 .throttle = acm_tty_throttle, 1792 .unthrottle = acm_tty_unthrottle, 1793 .chars_in_buffer = acm_tty_chars_in_buffer, 1794 .break_ctl = acm_tty_break_ctl, 1795 .set_termios = acm_tty_set_termios, 1796 .tiocmget = acm_tty_tiocmget, 1797 .tiocmset = acm_tty_tiocmset, 1798}; 1799 1800/* 1801 * Init / exit. 1802 */ 1803 1804static int __init acm_init(void) 1805{ 1806 int retval; 1807 acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS); 1808 if (!acm_tty_driver) 1809 return -ENOMEM; 1810 acm_tty_driver->driver_name = "acm", 1811 acm_tty_driver->name = "ttyACM", 1812 acm_tty_driver->major = ACM_TTY_MAJOR, 1813 acm_tty_driver->minor_start = 0, 1814 acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL, 1815 acm_tty_driver->subtype = SERIAL_TYPE_NORMAL, 1816 acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; 1817 acm_tty_driver->init_termios = tty_std_termios; 1818 acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | 1819 HUPCL | CLOCAL; 1820 tty_set_operations(acm_tty_driver, &acm_ops); 1821 1822 retval = tty_register_driver(acm_tty_driver); 1823 if (retval) { 1824 put_tty_driver(acm_tty_driver); 1825 return retval; 1826 } 1827 1828 retval = usb_register(&acm_driver); 1829 if (retval) { 1830 tty_unregister_driver(acm_tty_driver); 1831 put_tty_driver(acm_tty_driver); 1832 return retval; 1833 } 1834 1835 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n"); 1836 1837 return 0; 1838} 1839 1840static void __exit acm_exit(void) 1841{ 1842 usb_deregister(&acm_driver); 1843 tty_unregister_driver(acm_tty_driver); 1844 put_tty_driver(acm_tty_driver); 1845} 1846 1847module_init(acm_init); 1848module_exit(acm_exit); 1849 1850MODULE_AUTHOR(DRIVER_AUTHOR); 1851MODULE_DESCRIPTION(DRIVER_DESC); 1852MODULE_LICENSE("GPL"); 1853MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR); 1854