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