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 * 11 * USB Abstract Control Model driver for USB modems and ISDN adapters 12 * 13 * Sponsored by SuSE 14 * 15 * ChangeLog: 16 * v0.9 - thorough cleaning, URBification, almost a rewrite 17 * v0.10 - some more cleanups 18 * v0.11 - fixed flow control, read error doesn't stop reads 19 * v0.12 - added TIOCM ioctls, added break handling, made struct acm 20 * kmalloced 21 * v0.13 - added termios, added hangup 22 * v0.14 - sized down struct acm 23 * v0.15 - fixed flow control again - characters could be lost 24 * v0.16 - added code for modems with swapped data and control interfaces 25 * v0.17 - added new style probing 26 * v0.18 - fixed new style probing for devices with more configurations 27 * v0.19 - fixed CLOCAL handling (thanks to Richard Shih-Ping Chan) 28 * v0.20 - switched to probing on interface (rather than device) class 29 * v0.21 - revert to probing on device for devices with multiple configs 30 * v0.22 - probe only the control interface. if usbcore doesn't choose the 31 * config we want, sysadmin changes bConfigurationValue in sysfs. 32 * v0.23 - use softirq for rx processing, as needed by tty layer 33 * v0.24 - change probe method to evaluate CDC union descriptor 34 * v0.25 - downstream tasks paralelized to maximize throughput 35 * v0.26 - multiple write urbs, writesize increased 36 */ 37 38 /* 39 * This program is free software; you can redistribute it and/or modify 40 * it under the terms of the GNU General Public License as published by 41 * the Free Software Foundation; either version 2 of the License, or 42 * (at your option) any later version. 43 * 44 * This program is distributed in the hope that it will be useful, 45 * but WITHOUT ANY WARRANTY; without even the implied warranty of 46 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 47 * GNU General Public License for more details. 48 * 49 * You should have received a copy of the GNU General Public License 50 * along with this program; if not, write to the Free Software 51 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 52 */ 53 54 #undef DEBUG 55 #undef VERBOSE_DEBUG 56 57 #include <linux/kernel.h> 58 #include <linux/errno.h> 59 #include <linux/init.h> 60 #include <linux/slab.h> 61 #include <linux/tty.h> 62 #include <linux/serial.h> 63 #include <linux/tty_driver.h> 64 #include <linux/tty_flip.h> 65 #include <linux/module.h> 66 #include <linux/mutex.h> 67 #include <linux/uaccess.h> 68 #include <linux/usb.h> 69 #include <linux/usb/cdc.h> 70 #include <asm/byteorder.h> 71 #include <asm/unaligned.h> 72 #include <linux/list.h> 73 74 #include "cdc-acm.h" 75 76 77 #define ACM_CLOSE_TIMEOUT 15 /* seconds to let writes drain */ 78 79 /* 80 * Version Information 81 */ 82 #define DRIVER_VERSION "v0.26" 83 #define DRIVER_AUTHOR "Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik, David Kubicek" 84 #define DRIVER_DESC "USB Abstract Control Model driver for USB modems and ISDN adapters" 85 86 static struct usb_driver acm_driver; 87 static struct tty_driver *acm_tty_driver; 88 static struct acm *acm_table[ACM_TTY_MINORS]; 89 90 static DEFINE_MUTEX(open_mutex); 91 92 #define ACM_READY(acm) (acm && acm->dev && acm->port.count) 93 94 static const struct tty_port_operations acm_port_ops = { 95 }; 96 97 #ifdef VERBOSE_DEBUG 98 #define verbose 1 99 #else 100 #define verbose 0 101 #endif 102 103 /* 104 * Functions for ACM control messages. 105 */ 106 107 static int acm_ctrl_msg(struct acm *acm, int request, int value, 108 void *buf, int len) 109 { 110 int retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0), 111 request, USB_RT_ACM, value, 112 acm->control->altsetting[0].desc.bInterfaceNumber, 113 buf, len, 5000); 114 dbg("acm_control_msg: rq: 0x%02x val: %#x len: %#x result: %d", 115 request, value, len, retval); 116 return retval < 0 ? retval : 0; 117 } 118 119 /* devices aren't required to support these requests. 120 * the cdc acm descriptor tells whether they do... 121 */ 122 #define acm_set_control(acm, control) \ 123 acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE, control, NULL, 0) 124 #define acm_set_line(acm, line) \ 125 acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line)) 126 #define acm_send_break(acm, ms) \ 127 acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0) 128 129 /* 130 * Write buffer management. 131 * All of these assume proper locks taken by the caller. 132 */ 133 134 static int acm_wb_alloc(struct acm *acm) 135 { 136 int i, wbn; 137 struct acm_wb *wb; 138 139 wbn = 0; 140 i = 0; 141 for (;;) { 142 wb = &acm->wb[wbn]; 143 if (!wb->use) { 144 wb->use = 1; 145 return wbn; 146 } 147 wbn = (wbn + 1) % ACM_NW; 148 if (++i >= ACM_NW) 149 return -1; 150 } 151 } 152 153 static int acm_wb_is_avail(struct acm *acm) 154 { 155 int i, n; 156 unsigned long flags; 157 158 n = ACM_NW; 159 spin_lock_irqsave(&acm->write_lock, flags); 160 for (i = 0; i < ACM_NW; i++) 161 n -= acm->wb[i].use; 162 spin_unlock_irqrestore(&acm->write_lock, flags); 163 return n; 164 } 165 166 /* 167 * Finish write. Caller must hold acm->write_lock 168 */ 169 static void acm_write_done(struct acm *acm, struct acm_wb *wb) 170 { 171 wb->use = 0; 172 acm->transmitting--; 173 usb_autopm_put_interface_async(acm->control); 174 } 175 176 /* 177 * Poke write. 178 * 179 * the caller is responsible for locking 180 */ 181 182 static int acm_start_wb(struct acm *acm, struct acm_wb *wb) 183 { 184 int rc; 185 186 acm->transmitting++; 187 188 wb->urb->transfer_buffer = wb->buf; 189 wb->urb->transfer_dma = wb->dmah; 190 wb->urb->transfer_buffer_length = wb->len; 191 wb->urb->dev = acm->dev; 192 193 rc = usb_submit_urb(wb->urb, GFP_ATOMIC); 194 if (rc < 0) { 195 dbg("usb_submit_urb(write bulk) failed: %d", rc); 196 acm_write_done(acm, wb); 197 } 198 return rc; 199 } 200 201 static int acm_write_start(struct acm *acm, int wbn) 202 { 203 unsigned long flags; 204 struct acm_wb *wb = &acm->wb[wbn]; 205 int rc; 206 207 spin_lock_irqsave(&acm->write_lock, flags); 208 if (!acm->dev) { 209 wb->use = 0; 210 spin_unlock_irqrestore(&acm->write_lock, flags); 211 return -ENODEV; 212 } 213 214 dbg("%s susp_count: %d", __func__, acm->susp_count); 215 usb_autopm_get_interface_async(acm->control); 216 if (acm->susp_count) { 217 if (!acm->delayed_wb) 218 acm->delayed_wb = wb; 219 else 220 usb_autopm_put_interface_async(acm->control); 221 spin_unlock_irqrestore(&acm->write_lock, flags); 222 return 0; /* A white lie */ 223 } 224 usb_mark_last_busy(acm->dev); 225 226 rc = acm_start_wb(acm, wb); 227 spin_unlock_irqrestore(&acm->write_lock, flags); 228 229 return rc; 230 231 } 232 /* 233 * attributes exported through sysfs 234 */ 235 static ssize_t show_caps 236 (struct device *dev, struct device_attribute *attr, char *buf) 237 { 238 struct usb_interface *intf = to_usb_interface(dev); 239 struct acm *acm = usb_get_intfdata(intf); 240 241 return sprintf(buf, "%d", acm->ctrl_caps); 242 } 243 static DEVICE_ATTR(bmCapabilities, S_IRUGO, show_caps, NULL); 244 245 static ssize_t show_country_codes 246 (struct device *dev, struct device_attribute *attr, char *buf) 247 { 248 struct usb_interface *intf = to_usb_interface(dev); 249 struct acm *acm = usb_get_intfdata(intf); 250 251 memcpy(buf, acm->country_codes, acm->country_code_size); 252 return acm->country_code_size; 253 } 254 255 static DEVICE_ATTR(wCountryCodes, S_IRUGO, show_country_codes, NULL); 256 257 static ssize_t show_country_rel_date 258 (struct device *dev, struct device_attribute *attr, char *buf) 259 { 260 struct usb_interface *intf = to_usb_interface(dev); 261 struct acm *acm = usb_get_intfdata(intf); 262 263 return sprintf(buf, "%d", acm->country_rel_date); 264 } 265 266 static DEVICE_ATTR(iCountryCodeRelDate, S_IRUGO, show_country_rel_date, NULL); 267 /* 268 * Interrupt handlers for various ACM device responses 269 */ 270 271 /* control interface reports status changes with "interrupt" transfers */ 272 static void acm_ctrl_irq(struct urb *urb) 273 { 274 struct acm *acm = urb->context; 275 struct usb_cdc_notification *dr = urb->transfer_buffer; 276 struct tty_struct *tty; 277 unsigned char *data; 278 int newctrl; 279 int retval; 280 int status = urb->status; 281 282 switch (status) { 283 case 0: 284 /* success */ 285 break; 286 case -ECONNRESET: 287 case -ENOENT: 288 case -ESHUTDOWN: 289 /* this urb is terminated, clean up */ 290 dbg("%s - urb shutting down with status: %d", __func__, status); 291 return; 292 default: 293 dbg("%s - nonzero urb status received: %d", __func__, status); 294 goto exit; 295 } 296 297 if (!ACM_READY(acm)) 298 goto exit; 299 300 data = (unsigned char *)(dr + 1); 301 switch (dr->bNotificationType) { 302 case USB_CDC_NOTIFY_NETWORK_CONNECTION: 303 dbg("%s network", dr->wValue ? 304 "connected to" : "disconnected from"); 305 break; 306 307 case USB_CDC_NOTIFY_SERIAL_STATE: 308 tty = tty_port_tty_get(&acm->port); 309 newctrl = get_unaligned_le16(data); 310 311 if (tty) { 312 if (!acm->clocal && 313 (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) { 314 dbg("calling hangup"); 315 tty_hangup(tty); 316 } 317 tty_kref_put(tty); 318 } 319 320 acm->ctrlin = newctrl; 321 322 dbg("input control lines: dcd%c dsr%c break%c ring%c framing%c parity%c overrun%c", 323 acm->ctrlin & ACM_CTRL_DCD ? '+' : '-', 324 acm->ctrlin & ACM_CTRL_DSR ? '+' : '-', 325 acm->ctrlin & ACM_CTRL_BRK ? '+' : '-', 326 acm->ctrlin & ACM_CTRL_RI ? '+' : '-', 327 acm->ctrlin & ACM_CTRL_FRAMING ? '+' : '-', 328 acm->ctrlin & ACM_CTRL_PARITY ? '+' : '-', 329 acm->ctrlin & ACM_CTRL_OVERRUN ? '+' : '-'); 330 break; 331 332 default: 333 dbg("unknown notification %d received: index %d len %d data0 %d data1 %d", 334 dr->bNotificationType, dr->wIndex, 335 dr->wLength, data[0], data[1]); 336 break; 337 } 338 exit: 339 usb_mark_last_busy(acm->dev); 340 retval = usb_submit_urb(urb, GFP_ATOMIC); 341 if (retval) 342 dev_err(&urb->dev->dev, "%s - usb_submit_urb failed with " 343 "result %d", __func__, retval); 344 } 345 346 /* data interface returns incoming bytes, or we got unthrottled */ 347 static void acm_read_bulk(struct urb *urb) 348 { 349 struct acm_rb *buf; 350 struct acm_ru *rcv = urb->context; 351 struct acm *acm = rcv->instance; 352 int status = urb->status; 353 354 dbg("Entering acm_read_bulk with status %d", status); 355 356 if (!ACM_READY(acm)) { 357 dev_dbg(&acm->data->dev, "Aborting, acm not ready"); 358 return; 359 } 360 usb_mark_last_busy(acm->dev); 361 362 if (status) 363 dev_dbg(&acm->data->dev, "bulk rx status %d\n", status); 364 365 buf = rcv->buffer; 366 buf->size = urb->actual_length; 367 368 if (likely(status == 0)) { 369 spin_lock(&acm->read_lock); 370 acm->processing++; 371 list_add_tail(&rcv->list, &acm->spare_read_urbs); 372 list_add_tail(&buf->list, &acm->filled_read_bufs); 373 spin_unlock(&acm->read_lock); 374 } else { 375 /* we drop the buffer due to an error */ 376 spin_lock(&acm->read_lock); 377 list_add_tail(&rcv->list, &acm->spare_read_urbs); 378 list_add(&buf->list, &acm->spare_read_bufs); 379 spin_unlock(&acm->read_lock); 380 /* nevertheless the tasklet must be kicked unconditionally 381 so the queue cannot dry up */ 382 } 383 if (likely(!acm->susp_count)) 384 tasklet_schedule(&acm->urb_task); 385 } 386 387 static void acm_rx_tasklet(unsigned long _acm) 388 { 389 struct acm *acm = (void *)_acm; 390 struct acm_rb *buf; 391 struct tty_struct *tty; 392 struct acm_ru *rcv; 393 unsigned long flags; 394 unsigned char throttled; 395 396 dbg("Entering acm_rx_tasklet"); 397 398 if (!ACM_READY(acm)) { 399 dbg("acm_rx_tasklet: ACM not ready"); 400 return; 401 } 402 403 spin_lock_irqsave(&acm->throttle_lock, flags); 404 throttled = acm->throttle; 405 spin_unlock_irqrestore(&acm->throttle_lock, flags); 406 if (throttled) { 407 dbg("acm_rx_tasklet: throttled"); 408 return; 409 } 410 411 tty = tty_port_tty_get(&acm->port); 412 413 next_buffer: 414 spin_lock_irqsave(&acm->read_lock, flags); 415 if (list_empty(&acm->filled_read_bufs)) { 416 spin_unlock_irqrestore(&acm->read_lock, flags); 417 goto urbs; 418 } 419 buf = list_entry(acm->filled_read_bufs.next, 420 struct acm_rb, list); 421 list_del(&buf->list); 422 spin_unlock_irqrestore(&acm->read_lock, flags); 423 424 dbg("acm_rx_tasklet: procesing buf 0x%p, size = %d", buf, buf->size); 425 426 if (tty) { 427 spin_lock_irqsave(&acm->throttle_lock, flags); 428 throttled = acm->throttle; 429 spin_unlock_irqrestore(&acm->throttle_lock, flags); 430 if (!throttled) { 431 tty_insert_flip_string(tty, buf->base, buf->size); 432 tty_flip_buffer_push(tty); 433 } else { 434 tty_kref_put(tty); 435 dbg("Throttling noticed"); 436 spin_lock_irqsave(&acm->read_lock, flags); 437 list_add(&buf->list, &acm->filled_read_bufs); 438 spin_unlock_irqrestore(&acm->read_lock, flags); 439 return; 440 } 441 } 442 443 spin_lock_irqsave(&acm->read_lock, flags); 444 list_add(&buf->list, &acm->spare_read_bufs); 445 spin_unlock_irqrestore(&acm->read_lock, flags); 446 goto next_buffer; 447 448 urbs: 449 tty_kref_put(tty); 450 451 while (!list_empty(&acm->spare_read_bufs)) { 452 spin_lock_irqsave(&acm->read_lock, flags); 453 if (list_empty(&acm->spare_read_urbs)) { 454 acm->processing = 0; 455 spin_unlock_irqrestore(&acm->read_lock, flags); 456 return; 457 } 458 rcv = list_entry(acm->spare_read_urbs.next, 459 struct acm_ru, list); 460 list_del(&rcv->list); 461 spin_unlock_irqrestore(&acm->read_lock, flags); 462 463 buf = list_entry(acm->spare_read_bufs.next, 464 struct acm_rb, list); 465 list_del(&buf->list); 466 467 rcv->buffer = buf; 468 469 if (acm->is_int_ep) 470 usb_fill_int_urb(rcv->urb, acm->dev, 471 acm->rx_endpoint, 472 buf->base, 473 acm->readsize, 474 acm_read_bulk, rcv, acm->bInterval); 475 else 476 usb_fill_bulk_urb(rcv->urb, acm->dev, 477 acm->rx_endpoint, 478 buf->base, 479 acm->readsize, 480 acm_read_bulk, rcv); 481 rcv->urb->transfer_dma = buf->dma; 482 rcv->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 483 484 /* This shouldn't kill the driver as unsuccessful URBs are 485 returned to the free-urbs-pool and resubmited ASAP */ 486 spin_lock_irqsave(&acm->read_lock, flags); 487 if (acm->susp_count || 488 usb_submit_urb(rcv->urb, GFP_ATOMIC) < 0) { 489 list_add(&buf->list, &acm->spare_read_bufs); 490 list_add(&rcv->list, &acm->spare_read_urbs); 491 acm->processing = 0; 492 spin_unlock_irqrestore(&acm->read_lock, flags); 493 return; 494 } else { 495 spin_unlock_irqrestore(&acm->read_lock, flags); 496 dbg("acm_rx_tasklet: sending urb 0x%p, rcv 0x%p, buf 0x%p", rcv->urb, rcv, buf); 497 } 498 } 499 spin_lock_irqsave(&acm->read_lock, flags); 500 acm->processing = 0; 501 spin_unlock_irqrestore(&acm->read_lock, flags); 502 } 503 504 /* data interface wrote those outgoing bytes */ 505 static void acm_write_bulk(struct urb *urb) 506 { 507 struct acm_wb *wb = urb->context; 508 struct acm *acm = wb->instance; 509 unsigned long flags; 510 511 if (verbose || urb->status 512 || (urb->actual_length != urb->transfer_buffer_length)) 513 dev_dbg(&acm->data->dev, "tx %d/%d bytes -- > %d\n", 514 urb->actual_length, 515 urb->transfer_buffer_length, 516 urb->status); 517 518 spin_lock_irqsave(&acm->write_lock, flags); 519 acm_write_done(acm, wb); 520 spin_unlock_irqrestore(&acm->write_lock, flags); 521 if (ACM_READY(acm)) 522 schedule_work(&acm->work); 523 else 524 wake_up_interruptible(&acm->drain_wait); 525 } 526 527 static void acm_softint(struct work_struct *work) 528 { 529 struct acm *acm = container_of(work, struct acm, work); 530 struct tty_struct *tty; 531 532 dev_vdbg(&acm->data->dev, "tx work\n"); 533 if (!ACM_READY(acm)) 534 return; 535 tty = tty_port_tty_get(&acm->port); 536 tty_wakeup(tty); 537 tty_kref_put(tty); 538 } 539 540 /* 541 * TTY handlers 542 */ 543 544 static int acm_tty_open(struct tty_struct *tty, struct file *filp) 545 { 546 struct acm *acm; 547 int rv = -ENODEV; 548 int i; 549 dbg("Entering acm_tty_open."); 550 551 mutex_lock(&open_mutex); 552 553 acm = acm_table[tty->index]; 554 if (!acm || !acm->dev) 555 goto out; 556 else 557 rv = 0; 558 559 set_bit(TTY_NO_WRITE_SPLIT, &tty->flags); 560 561 tty->driver_data = acm; 562 tty_port_tty_set(&acm->port, tty); 563 564 if (usb_autopm_get_interface(acm->control) < 0) 565 goto early_bail; 566 else 567 acm->control->needs_remote_wakeup = 1; 568 569 mutex_lock(&acm->mutex); 570 if (acm->port.count++) { 571 mutex_unlock(&acm->mutex); 572 usb_autopm_put_interface(acm->control); 573 goto out; 574 } 575 576 acm->ctrlurb->dev = acm->dev; 577 if (usb_submit_urb(acm->ctrlurb, GFP_KERNEL)) { 578 dbg("usb_submit_urb(ctrl irq) failed"); 579 goto bail_out; 580 } 581 582 if (0 > acm_set_control(acm, acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS) && 583 (acm->ctrl_caps & USB_CDC_CAP_LINE)) 584 goto full_bailout; 585 586 usb_autopm_put_interface(acm->control); 587 588 INIT_LIST_HEAD(&acm->spare_read_urbs); 589 INIT_LIST_HEAD(&acm->spare_read_bufs); 590 INIT_LIST_HEAD(&acm->filled_read_bufs); 591 592 for (i = 0; i < acm->rx_buflimit; i++) 593 list_add(&(acm->ru[i].list), &acm->spare_read_urbs); 594 for (i = 0; i < acm->rx_buflimit; i++) 595 list_add(&(acm->rb[i].list), &acm->spare_read_bufs); 596 597 acm->throttle = 0; 598 599 set_bit(ASYNCB_INITIALIZED, &acm->port.flags); 600 rv = tty_port_block_til_ready(&acm->port, tty, filp); 601 tasklet_schedule(&acm->urb_task); 602 603 mutex_unlock(&acm->mutex); 604 out: 605 mutex_unlock(&open_mutex); 606 return rv; 607 608 full_bailout: 609 usb_kill_urb(acm->ctrlurb); 610 bail_out: 611 acm->port.count--; 612 mutex_unlock(&acm->mutex); 613 usb_autopm_put_interface(acm->control); 614 early_bail: 615 mutex_unlock(&open_mutex); 616 tty_port_tty_set(&acm->port, NULL); 617 return -EIO; 618 } 619 620 static void acm_tty_unregister(struct acm *acm) 621 { 622 int i, nr; 623 624 nr = acm->rx_buflimit; 625 tty_unregister_device(acm_tty_driver, acm->minor); 626 usb_put_intf(acm->control); 627 acm_table[acm->minor] = NULL; 628 usb_free_urb(acm->ctrlurb); 629 for (i = 0; i < ACM_NW; i++) 630 usb_free_urb(acm->wb[i].urb); 631 for (i = 0; i < nr; i++) 632 usb_free_urb(acm->ru[i].urb); 633 kfree(acm->country_codes); 634 kfree(acm); 635 } 636 637 static int acm_tty_chars_in_buffer(struct tty_struct *tty); 638 639 static void acm_port_down(struct acm *acm) 640 { 641 int i, nr = acm->rx_buflimit; 642 mutex_lock(&open_mutex); 643 if (acm->dev) { 644 usb_autopm_get_interface(acm->control); 645 acm_set_control(acm, acm->ctrlout = 0); 646 usb_kill_urb(acm->ctrlurb); 647 for (i = 0; i < ACM_NW; i++) 648 usb_kill_urb(acm->wb[i].urb); 649 for (i = 0; i < nr; i++) 650 usb_kill_urb(acm->ru[i].urb); 651 acm->control->needs_remote_wakeup = 0; 652 usb_autopm_put_interface(acm->control); 653 } 654 mutex_unlock(&open_mutex); 655 } 656 657 static void acm_tty_hangup(struct tty_struct *tty) 658 { 659 struct acm *acm = tty->driver_data; 660 tty_port_hangup(&acm->port); 661 acm_port_down(acm); 662 } 663 664 static void acm_tty_close(struct tty_struct *tty, struct file *filp) 665 { 666 struct acm *acm = tty->driver_data; 667 668 /* Perform the closing process and see if we need to do the hardware 669 shutdown */ 670 if (!acm) 671 return; 672 if (tty_port_close_start(&acm->port, tty, filp) == 0) { 673 mutex_lock(&open_mutex); 674 if (!acm->dev) { 675 tty_port_tty_set(&acm->port, NULL); 676 acm_tty_unregister(acm); 677 tty->driver_data = NULL; 678 } 679 mutex_unlock(&open_mutex); 680 return; 681 } 682 acm_port_down(acm); 683 tty_port_close_end(&acm->port, tty); 684 tty_port_tty_set(&acm->port, NULL); 685 } 686 687 static int acm_tty_write(struct tty_struct *tty, 688 const unsigned char *buf, int count) 689 { 690 struct acm *acm = tty->driver_data; 691 int stat; 692 unsigned long flags; 693 int wbn; 694 struct acm_wb *wb; 695 696 dbg("Entering acm_tty_write to write %d bytes,", count); 697 698 if (!ACM_READY(acm)) 699 return -EINVAL; 700 if (!count) 701 return 0; 702 703 spin_lock_irqsave(&acm->write_lock, flags); 704 wbn = acm_wb_alloc(acm); 705 if (wbn < 0) { 706 spin_unlock_irqrestore(&acm->write_lock, flags); 707 return 0; 708 } 709 wb = &acm->wb[wbn]; 710 711 count = (count > acm->writesize) ? acm->writesize : count; 712 dbg("Get %d bytes...", count); 713 memcpy(wb->buf, buf, count); 714 wb->len = count; 715 spin_unlock_irqrestore(&acm->write_lock, flags); 716 717 stat = acm_write_start(acm, wbn); 718 if (stat < 0) 719 return stat; 720 return count; 721 } 722 723 static int acm_tty_write_room(struct tty_struct *tty) 724 { 725 struct acm *acm = tty->driver_data; 726 if (!ACM_READY(acm)) 727 return -EINVAL; 728 /* 729 * Do not let the line discipline to know that we have a reserve, 730 * or it might get too enthusiastic. 731 */ 732 return acm_wb_is_avail(acm) ? acm->writesize : 0; 733 } 734 735 static int acm_tty_chars_in_buffer(struct tty_struct *tty) 736 { 737 struct acm *acm = tty->driver_data; 738 if (!ACM_READY(acm)) 739 return 0; 740 /* 741 * This is inaccurate (overcounts), but it works. 742 */ 743 return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize; 744 } 745 746 static void acm_tty_throttle(struct tty_struct *tty) 747 { 748 struct acm *acm = tty->driver_data; 749 if (!ACM_READY(acm)) 750 return; 751 spin_lock_bh(&acm->throttle_lock); 752 acm->throttle = 1; 753 spin_unlock_bh(&acm->throttle_lock); 754 } 755 756 static void acm_tty_unthrottle(struct tty_struct *tty) 757 { 758 struct acm *acm = tty->driver_data; 759 if (!ACM_READY(acm)) 760 return; 761 spin_lock_bh(&acm->throttle_lock); 762 acm->throttle = 0; 763 spin_unlock_bh(&acm->throttle_lock); 764 tasklet_schedule(&acm->urb_task); 765 } 766 767 static int acm_tty_break_ctl(struct tty_struct *tty, int state) 768 { 769 struct acm *acm = tty->driver_data; 770 int retval; 771 if (!ACM_READY(acm)) 772 return -EINVAL; 773 retval = acm_send_break(acm, state ? 0xffff : 0); 774 if (retval < 0) 775 dbg("send break failed"); 776 return retval; 777 } 778 779 static int acm_tty_tiocmget(struct tty_struct *tty, struct file *file) 780 { 781 struct acm *acm = tty->driver_data; 782 783 if (!ACM_READY(acm)) 784 return -EINVAL; 785 786 return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) | 787 (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) | 788 (acm->ctrlin & ACM_CTRL_DSR ? TIOCM_DSR : 0) | 789 (acm->ctrlin & ACM_CTRL_RI ? TIOCM_RI : 0) | 790 (acm->ctrlin & ACM_CTRL_DCD ? TIOCM_CD : 0) | 791 TIOCM_CTS; 792 } 793 794 static int acm_tty_tiocmset(struct tty_struct *tty, struct file *file, 795 unsigned int set, unsigned int clear) 796 { 797 struct acm *acm = tty->driver_data; 798 unsigned int newctrl; 799 800 if (!ACM_READY(acm)) 801 return -EINVAL; 802 803 newctrl = acm->ctrlout; 804 set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) | 805 (set & TIOCM_RTS ? ACM_CTRL_RTS : 0); 806 clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) | 807 (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0); 808 809 newctrl = (newctrl & ~clear) | set; 810 811 if (acm->ctrlout == newctrl) 812 return 0; 813 return acm_set_control(acm, acm->ctrlout = newctrl); 814 } 815 816 static int acm_tty_ioctl(struct tty_struct *tty, struct file *file, 817 unsigned int cmd, unsigned long arg) 818 { 819 struct acm *acm = tty->driver_data; 820 821 if (!ACM_READY(acm)) 822 return -EINVAL; 823 824 return -ENOIOCTLCMD; 825 } 826 827 static const __u32 acm_tty_speed[] = { 828 0, 50, 75, 110, 134, 150, 200, 300, 600, 829 1200, 1800, 2400, 4800, 9600, 19200, 38400, 830 57600, 115200, 230400, 460800, 500000, 576000, 831 921600, 1000000, 1152000, 1500000, 2000000, 832 2500000, 3000000, 3500000, 4000000 833 }; 834 835 static const __u8 acm_tty_size[] = { 836 5, 6, 7, 8 837 }; 838 839 static void acm_tty_set_termios(struct tty_struct *tty, 840 struct ktermios *termios_old) 841 { 842 struct acm *acm = tty->driver_data; 843 struct ktermios *termios = tty->termios; 844 struct usb_cdc_line_coding newline; 845 int newctrl = acm->ctrlout; 846 847 if (!ACM_READY(acm)) 848 return; 849 850 newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty)); 851 newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0; 852 newline.bParityType = termios->c_cflag & PARENB ? 853 (termios->c_cflag & PARODD ? 1 : 2) + 854 (termios->c_cflag & CMSPAR ? 2 : 0) : 0; 855 newline.bDataBits = acm_tty_size[(termios->c_cflag & CSIZE) >> 4]; 856 /* FIXME: Needs to clear unsupported bits in the termios */ 857 acm->clocal = ((termios->c_cflag & CLOCAL) != 0); 858 859 if (!newline.dwDTERate) { 860 newline.dwDTERate = acm->line.dwDTERate; 861 newctrl &= ~ACM_CTRL_DTR; 862 } else 863 newctrl |= ACM_CTRL_DTR; 864 865 if (newctrl != acm->ctrlout) 866 acm_set_control(acm, acm->ctrlout = newctrl); 867 868 if (memcmp(&acm->line, &newline, sizeof newline)) { 869 memcpy(&acm->line, &newline, sizeof newline); 870 dbg("set line: %d %d %d %d", le32_to_cpu(newline.dwDTERate), 871 newline.bCharFormat, newline.bParityType, 872 newline.bDataBits); 873 acm_set_line(acm, &acm->line); 874 } 875 } 876 877 /* 878 * USB probe and disconnect routines. 879 */ 880 881 /* Little helpers: write/read buffers free */ 882 static void acm_write_buffers_free(struct acm *acm) 883 { 884 int i; 885 struct acm_wb *wb; 886 struct usb_device *usb_dev = interface_to_usbdev(acm->control); 887 888 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) 889 usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah); 890 } 891 892 static void acm_read_buffers_free(struct acm *acm) 893 { 894 struct usb_device *usb_dev = interface_to_usbdev(acm->control); 895 int i, n = acm->rx_buflimit; 896 897 for (i = 0; i < n; i++) 898 usb_free_coherent(usb_dev, acm->readsize, 899 acm->rb[i].base, acm->rb[i].dma); 900 } 901 902 /* Little helper: write buffers allocate */ 903 static int acm_write_buffers_alloc(struct acm *acm) 904 { 905 int i; 906 struct acm_wb *wb; 907 908 for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) { 909 wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL, 910 &wb->dmah); 911 if (!wb->buf) { 912 while (i != 0) { 913 --i; 914 --wb; 915 usb_free_coherent(acm->dev, acm->writesize, 916 wb->buf, wb->dmah); 917 } 918 return -ENOMEM; 919 } 920 } 921 return 0; 922 } 923 924 static int acm_probe(struct usb_interface *intf, 925 const struct usb_device_id *id) 926 { 927 struct usb_cdc_union_desc *union_header = NULL; 928 struct usb_cdc_country_functional_desc *cfd = NULL; 929 unsigned char *buffer = intf->altsetting->extra; 930 int buflen = intf->altsetting->extralen; 931 struct usb_interface *control_interface; 932 struct usb_interface *data_interface; 933 struct usb_endpoint_descriptor *epctrl = NULL; 934 struct usb_endpoint_descriptor *epread = NULL; 935 struct usb_endpoint_descriptor *epwrite = NULL; 936 struct usb_device *usb_dev = interface_to_usbdev(intf); 937 struct acm *acm; 938 int minor; 939 int ctrlsize, readsize; 940 u8 *buf; 941 u8 ac_management_function = 0; 942 u8 call_management_function = 0; 943 int call_interface_num = -1; 944 int data_interface_num; 945 unsigned long quirks; 946 int num_rx_buf; 947 int i; 948 int combined_interfaces = 0; 949 950 /* normal quirks */ 951 quirks = (unsigned long)id->driver_info; 952 num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR; 953 954 /* handle quirks deadly to normal probing*/ 955 if (quirks == NO_UNION_NORMAL) { 956 data_interface = usb_ifnum_to_if(usb_dev, 1); 957 control_interface = usb_ifnum_to_if(usb_dev, 0); 958 goto skip_normal_probe; 959 } 960 961 /* normal probing*/ 962 if (!buffer) { 963 dev_err(&intf->dev, "Weird descriptor references\n"); 964 return -EINVAL; 965 } 966 967 if (!buflen) { 968 if (intf->cur_altsetting->endpoint->extralen && 969 intf->cur_altsetting->endpoint->extra) { 970 dev_dbg(&intf->dev, 971 "Seeking extra descriptors on endpoint\n"); 972 buflen = intf->cur_altsetting->endpoint->extralen; 973 buffer = intf->cur_altsetting->endpoint->extra; 974 } else { 975 dev_err(&intf->dev, 976 "Zero length descriptor references\n"); 977 return -EINVAL; 978 } 979 } 980 981 while (buflen > 0) { 982 if (buffer[1] != USB_DT_CS_INTERFACE) { 983 dev_err(&intf->dev, "skipping garbage\n"); 984 goto next_desc; 985 } 986 987 switch (buffer[2]) { 988 case USB_CDC_UNION_TYPE: /* we've found it */ 989 if (union_header) { 990 dev_err(&intf->dev, "More than one " 991 "union descriptor, skipping ...\n"); 992 goto next_desc; 993 } 994 union_header = (struct usb_cdc_union_desc *)buffer; 995 break; 996 case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/ 997 cfd = (struct usb_cdc_country_functional_desc *)buffer; 998 break; 999 case USB_CDC_HEADER_TYPE: /* maybe check version */ 1000 break; /* for now we ignore it */ 1001 case USB_CDC_ACM_TYPE: 1002 ac_management_function = buffer[3]; 1003 break; 1004 case USB_CDC_CALL_MANAGEMENT_TYPE: 1005 call_management_function = buffer[3]; 1006 call_interface_num = buffer[4]; 1007 if ( (quirks & NOT_A_MODEM) == 0 && (call_management_function & 3) != 3) 1008 dev_err(&intf->dev, "This device cannot do calls on its own. It is not a modem.\n"); 1009 break; 1010 default: 1011 /* there are LOTS more CDC descriptors that 1012 * could legitimately be found here. 1013 */ 1014 dev_dbg(&intf->dev, "Ignoring descriptor: " 1015 "type %02x, length %d\n", 1016 buffer[2], buffer[0]); 1017 break; 1018 } 1019 next_desc: 1020 buflen -= buffer[0]; 1021 buffer += buffer[0]; 1022 } 1023 1024 if (!union_header) { 1025 if (call_interface_num > 0) { 1026 dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n"); 1027 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num)); 1028 control_interface = intf; 1029 } else { 1030 if (intf->cur_altsetting->desc.bNumEndpoints != 3) { 1031 dev_dbg(&intf->dev,"No union descriptor, giving up\n"); 1032 return -ENODEV; 1033 } else { 1034 dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n"); 1035 combined_interfaces = 1; 1036 control_interface = data_interface = intf; 1037 goto look_for_collapsed_interface; 1038 } 1039 } 1040 } else { 1041 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0); 1042 data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0)); 1043 if (!control_interface || !data_interface) { 1044 dev_dbg(&intf->dev, "no interfaces\n"); 1045 return -ENODEV; 1046 } 1047 } 1048 1049 if (data_interface_num != call_interface_num) 1050 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n"); 1051 1052 if (control_interface == data_interface) { 1053 /* some broken devices designed for windows work this way */ 1054 dev_warn(&intf->dev,"Control and data interfaces are not separated!\n"); 1055 combined_interfaces = 1; 1056 /* a popular other OS doesn't use it */ 1057 quirks |= NO_CAP_LINE; 1058 if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) { 1059 dev_err(&intf->dev, "This needs exactly 3 endpoints\n"); 1060 return -EINVAL; 1061 } 1062 look_for_collapsed_interface: 1063 for (i = 0; i < 3; i++) { 1064 struct usb_endpoint_descriptor *ep; 1065 ep = &data_interface->cur_altsetting->endpoint[i].desc; 1066 1067 if (usb_endpoint_is_int_in(ep)) 1068 epctrl = ep; 1069 else if (usb_endpoint_is_bulk_out(ep)) 1070 epwrite = ep; 1071 else if (usb_endpoint_is_bulk_in(ep)) 1072 epread = ep; 1073 else 1074 return -EINVAL; 1075 } 1076 if (!epctrl || !epread || !epwrite) 1077 return -ENODEV; 1078 else 1079 goto made_compressed_probe; 1080 } 1081 1082 skip_normal_probe: 1083 1084 /*workaround for switched interfaces */ 1085 if (data_interface->cur_altsetting->desc.bInterfaceClass 1086 != CDC_DATA_INTERFACE_TYPE) { 1087 if (control_interface->cur_altsetting->desc.bInterfaceClass 1088 == CDC_DATA_INTERFACE_TYPE) { 1089 struct usb_interface *t; 1090 dev_dbg(&intf->dev, 1091 "Your device has switched interfaces.\n"); 1092 t = control_interface; 1093 control_interface = data_interface; 1094 data_interface = t; 1095 } else { 1096 return -EINVAL; 1097 } 1098 } 1099 1100 /* Accept probe requests only for the control interface */ 1101 if (!combined_interfaces && intf != control_interface) 1102 return -ENODEV; 1103 1104 if (!combined_interfaces && usb_interface_claimed(data_interface)) { 1105 /* valid in this context */ 1106 dev_dbg(&intf->dev, "The data interface isn't available\n"); 1107 return -EBUSY; 1108 } 1109 1110 1111 if (data_interface->cur_altsetting->desc.bNumEndpoints < 2) 1112 return -EINVAL; 1113 1114 epctrl = &control_interface->cur_altsetting->endpoint[0].desc; 1115 epread = &data_interface->cur_altsetting->endpoint[0].desc; 1116 epwrite = &data_interface->cur_altsetting->endpoint[1].desc; 1117 1118 1119 /* workaround for switched endpoints */ 1120 if (!usb_endpoint_dir_in(epread)) { 1121 /* descriptors are swapped */ 1122 struct usb_endpoint_descriptor *t; 1123 dev_dbg(&intf->dev, 1124 "The data interface has switched endpoints\n"); 1125 t = epread; 1126 epread = epwrite; 1127 epwrite = t; 1128 } 1129 made_compressed_probe: 1130 dbg("interfaces are valid"); 1131 for (minor = 0; minor < ACM_TTY_MINORS && acm_table[minor]; minor++); 1132 1133 if (minor == ACM_TTY_MINORS) { 1134 dev_err(&intf->dev, "no more free acm devices\n"); 1135 return -ENODEV; 1136 } 1137 1138 acm = kzalloc(sizeof(struct acm), GFP_KERNEL); 1139 if (acm == NULL) { 1140 dev_dbg(&intf->dev, "out of memory (acm kzalloc)\n"); 1141 goto alloc_fail; 1142 } 1143 1144 ctrlsize = le16_to_cpu(epctrl->wMaxPacketSize); 1145 readsize = le16_to_cpu(epread->wMaxPacketSize) * 1146 (quirks == SINGLE_RX_URB ? 1 : 2); 1147 acm->combined_interfaces = combined_interfaces; 1148 acm->writesize = le16_to_cpu(epwrite->wMaxPacketSize) * 20; 1149 acm->control = control_interface; 1150 acm->data = data_interface; 1151 acm->minor = minor; 1152 acm->dev = usb_dev; 1153 acm->ctrl_caps = ac_management_function; 1154 if (quirks & NO_CAP_LINE) 1155 acm->ctrl_caps &= ~USB_CDC_CAP_LINE; 1156 acm->ctrlsize = ctrlsize; 1157 acm->readsize = readsize; 1158 acm->rx_buflimit = num_rx_buf; 1159 acm->urb_task.func = acm_rx_tasklet; 1160 acm->urb_task.data = (unsigned long) acm; 1161 INIT_WORK(&acm->work, acm_softint); 1162 init_waitqueue_head(&acm->drain_wait); 1163 spin_lock_init(&acm->throttle_lock); 1164 spin_lock_init(&acm->write_lock); 1165 spin_lock_init(&acm->read_lock); 1166 mutex_init(&acm->mutex); 1167 acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress); 1168 acm->is_int_ep = usb_endpoint_xfer_int(epread); 1169 if (acm->is_int_ep) 1170 acm->bInterval = epread->bInterval; 1171 tty_port_init(&acm->port); 1172 acm->port.ops = &acm_port_ops; 1173 1174 buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma); 1175 if (!buf) { 1176 dev_dbg(&intf->dev, "out of memory (ctrl buffer alloc)\n"); 1177 goto alloc_fail2; 1178 } 1179 acm->ctrl_buffer = buf; 1180 1181 if (acm_write_buffers_alloc(acm) < 0) { 1182 dev_dbg(&intf->dev, "out of memory (write buffer alloc)\n"); 1183 goto alloc_fail4; 1184 } 1185 1186 acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL); 1187 if (!acm->ctrlurb) { 1188 dev_dbg(&intf->dev, "out of memory (ctrlurb kmalloc)\n"); 1189 goto alloc_fail5; 1190 } 1191 for (i = 0; i < num_rx_buf; i++) { 1192 struct acm_ru *rcv = &(acm->ru[i]); 1193 1194 rcv->urb = usb_alloc_urb(0, GFP_KERNEL); 1195 if (rcv->urb == NULL) { 1196 dev_dbg(&intf->dev, 1197 "out of memory (read urbs usb_alloc_urb)\n"); 1198 goto alloc_fail6; 1199 } 1200 1201 rcv->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 1202 rcv->instance = acm; 1203 } 1204 for (i = 0; i < num_rx_buf; i++) { 1205 struct acm_rb *rb = &(acm->rb[i]); 1206 1207 rb->base = usb_alloc_coherent(acm->dev, readsize, 1208 GFP_KERNEL, &rb->dma); 1209 if (!rb->base) { 1210 dev_dbg(&intf->dev, 1211 "out of memory (read bufs usb_alloc_coherent)\n"); 1212 goto alloc_fail7; 1213 } 1214 } 1215 for (i = 0; i < ACM_NW; i++) { 1216 struct acm_wb *snd = &(acm->wb[i]); 1217 1218 snd->urb = usb_alloc_urb(0, GFP_KERNEL); 1219 if (snd->urb == NULL) { 1220 dev_dbg(&intf->dev, 1221 "out of memory (write urbs usb_alloc_urb)"); 1222 goto alloc_fail8; 1223 } 1224 1225 if (usb_endpoint_xfer_int(epwrite)) 1226 usb_fill_int_urb(snd->urb, usb_dev, 1227 usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress), 1228 NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval); 1229 else 1230 usb_fill_bulk_urb(snd->urb, usb_dev, 1231 usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress), 1232 NULL, acm->writesize, acm_write_bulk, snd); 1233 snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 1234 snd->instance = acm; 1235 } 1236 1237 usb_set_intfdata(intf, acm); 1238 1239 i = device_create_file(&intf->dev, &dev_attr_bmCapabilities); 1240 if (i < 0) 1241 goto alloc_fail8; 1242 1243 if (cfd) { /* export the country data */ 1244 acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL); 1245 if (!acm->country_codes) 1246 goto skip_countries; 1247 acm->country_code_size = cfd->bLength - 4; 1248 memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0, 1249 cfd->bLength - 4); 1250 acm->country_rel_date = cfd->iCountryCodeRelDate; 1251 1252 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes); 1253 if (i < 0) { 1254 kfree(acm->country_codes); 1255 goto skip_countries; 1256 } 1257 1258 i = device_create_file(&intf->dev, 1259 &dev_attr_iCountryCodeRelDate); 1260 if (i < 0) { 1261 device_remove_file(&intf->dev, &dev_attr_wCountryCodes); 1262 kfree(acm->country_codes); 1263 goto skip_countries; 1264 } 1265 } 1266 1267 skip_countries: 1268 usb_fill_int_urb(acm->ctrlurb, usb_dev, 1269 usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress), 1270 acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm, 1271 /* works around buggy devices */ 1272 epctrl->bInterval ? epctrl->bInterval : 0xff); 1273 acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 1274 acm->ctrlurb->transfer_dma = acm->ctrl_dma; 1275 1276 dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor); 1277 1278 acm_set_control(acm, acm->ctrlout); 1279 1280 acm->line.dwDTERate = cpu_to_le32(9600); 1281 acm->line.bDataBits = 8; 1282 acm_set_line(acm, &acm->line); 1283 1284 usb_driver_claim_interface(&acm_driver, data_interface, acm); 1285 usb_set_intfdata(data_interface, acm); 1286 1287 usb_get_intf(control_interface); 1288 tty_register_device(acm_tty_driver, minor, &control_interface->dev); 1289 1290 acm_table[minor] = acm; 1291 1292 return 0; 1293 alloc_fail8: 1294 for (i = 0; i < ACM_NW; i++) 1295 usb_free_urb(acm->wb[i].urb); 1296 alloc_fail7: 1297 acm_read_buffers_free(acm); 1298 alloc_fail6: 1299 for (i = 0; i < num_rx_buf; i++) 1300 usb_free_urb(acm->ru[i].urb); 1301 usb_free_urb(acm->ctrlurb); 1302 alloc_fail5: 1303 acm_write_buffers_free(acm); 1304 alloc_fail4: 1305 usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma); 1306 alloc_fail2: 1307 kfree(acm); 1308 alloc_fail: 1309 return -ENOMEM; 1310 } 1311 1312 static void stop_data_traffic(struct acm *acm) 1313 { 1314 int i; 1315 dbg("Entering stop_data_traffic"); 1316 1317 tasklet_disable(&acm->urb_task); 1318 1319 usb_kill_urb(acm->ctrlurb); 1320 for (i = 0; i < ACM_NW; i++) 1321 usb_kill_urb(acm->wb[i].urb); 1322 for (i = 0; i < acm->rx_buflimit; i++) 1323 usb_kill_urb(acm->ru[i].urb); 1324 1325 tasklet_enable(&acm->urb_task); 1326 1327 cancel_work_sync(&acm->work); 1328 } 1329 1330 static void acm_disconnect(struct usb_interface *intf) 1331 { 1332 struct acm *acm = usb_get_intfdata(intf); 1333 struct usb_device *usb_dev = interface_to_usbdev(intf); 1334 struct tty_struct *tty; 1335 1336 /* sibling interface is already cleaning up */ 1337 if (!acm) 1338 return; 1339 1340 mutex_lock(&open_mutex); 1341 if (acm->country_codes) { 1342 device_remove_file(&acm->control->dev, 1343 &dev_attr_wCountryCodes); 1344 device_remove_file(&acm->control->dev, 1345 &dev_attr_iCountryCodeRelDate); 1346 } 1347 device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities); 1348 acm->dev = NULL; 1349 usb_set_intfdata(acm->control, NULL); 1350 usb_set_intfdata(acm->data, NULL); 1351 1352 stop_data_traffic(acm); 1353 1354 acm_write_buffers_free(acm); 1355 usb_free_coherent(usb_dev, acm->ctrlsize, acm->ctrl_buffer, 1356 acm->ctrl_dma); 1357 acm_read_buffers_free(acm); 1358 1359 if (!acm->combined_interfaces) 1360 usb_driver_release_interface(&acm_driver, intf == acm->control ? 1361 acm->data : acm->control); 1362 1363 if (acm->port.count == 0) { 1364 acm_tty_unregister(acm); 1365 mutex_unlock(&open_mutex); 1366 return; 1367 } 1368 1369 mutex_unlock(&open_mutex); 1370 tty = tty_port_tty_get(&acm->port); 1371 if (tty) { 1372 tty_hangup(tty); 1373 tty_kref_put(tty); 1374 } 1375 } 1376 1377 #ifdef CONFIG_PM 1378 static int acm_suspend(struct usb_interface *intf, pm_message_t message) 1379 { 1380 struct acm *acm = usb_get_intfdata(intf); 1381 int cnt; 1382 1383 if (message.event & PM_EVENT_AUTO) { 1384 int b; 1385 1386 spin_lock_irq(&acm->read_lock); 1387 spin_lock(&acm->write_lock); 1388 b = acm->processing + acm->transmitting; 1389 spin_unlock(&acm->write_lock); 1390 spin_unlock_irq(&acm->read_lock); 1391 if (b) 1392 return -EBUSY; 1393 } 1394 1395 spin_lock_irq(&acm->read_lock); 1396 spin_lock(&acm->write_lock); 1397 cnt = acm->susp_count++; 1398 spin_unlock(&acm->write_lock); 1399 spin_unlock_irq(&acm->read_lock); 1400 1401 if (cnt) 1402 return 0; 1403 /* 1404 we treat opened interfaces differently, 1405 we must guard against open 1406 */ 1407 mutex_lock(&acm->mutex); 1408 1409 if (acm->port.count) 1410 stop_data_traffic(acm); 1411 1412 mutex_unlock(&acm->mutex); 1413 return 0; 1414 } 1415 1416 static int acm_resume(struct usb_interface *intf) 1417 { 1418 struct acm *acm = usb_get_intfdata(intf); 1419 struct acm_wb *wb; 1420 int rv = 0; 1421 int cnt; 1422 1423 spin_lock_irq(&acm->read_lock); 1424 acm->susp_count -= 1; 1425 cnt = acm->susp_count; 1426 spin_unlock_irq(&acm->read_lock); 1427 1428 if (cnt) 1429 return 0; 1430 1431 mutex_lock(&acm->mutex); 1432 if (acm->port.count) { 1433 rv = usb_submit_urb(acm->ctrlurb, GFP_NOIO); 1434 1435 spin_lock_irq(&acm->write_lock); 1436 if (acm->delayed_wb) { 1437 wb = acm->delayed_wb; 1438 acm->delayed_wb = NULL; 1439 spin_unlock_irq(&acm->write_lock); 1440 acm_start_wb(acm, wb); 1441 } else { 1442 spin_unlock_irq(&acm->write_lock); 1443 } 1444 1445 /* 1446 * delayed error checking because we must 1447 * do the write path at all cost 1448 */ 1449 if (rv < 0) 1450 goto err_out; 1451 1452 tasklet_schedule(&acm->urb_task); 1453 } 1454 1455 err_out: 1456 mutex_unlock(&acm->mutex); 1457 return rv; 1458 } 1459 1460 static int acm_reset_resume(struct usb_interface *intf) 1461 { 1462 struct acm *acm = usb_get_intfdata(intf); 1463 struct tty_struct *tty; 1464 1465 mutex_lock(&acm->mutex); 1466 if (acm->port.count) { 1467 tty = tty_port_tty_get(&acm->port); 1468 if (tty) { 1469 tty_hangup(tty); 1470 tty_kref_put(tty); 1471 } 1472 } 1473 mutex_unlock(&acm->mutex); 1474 return acm_resume(intf); 1475 } 1476 1477 #endif /* CONFIG_PM */ 1478 1479 #define NOKIA_PCSUITE_ACM_INFO(x) \ 1480 USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \ 1481 USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \ 1482 USB_CDC_ACM_PROTO_VENDOR) 1483 1484 /* 1485 * USB driver structure. 1486 */ 1487 1488 static const struct usb_device_id acm_ids[] = { 1489 /* quirky and broken devices */ 1490 { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */ 1491 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */ 1492 }, 1493 { USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */ 1494 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */ 1495 }, 1496 { USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */ 1497 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */ 1498 }, 1499 { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */ 1500 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */ 1501 }, 1502 { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */ 1503 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */ 1504 }, 1505 { USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */ 1506 .driver_info = SINGLE_RX_URB, 1507 }, 1508 { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */ 1509 .driver_info = SINGLE_RX_URB, /* firmware bug */ 1510 }, 1511 { USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */ 1512 .driver_info = SINGLE_RX_URB, /* firmware bug */ 1513 }, 1514 { USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */ 1515 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */ 1516 }, 1517 { USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */ 1518 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */ 1519 }, 1520 { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */ 1521 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */ 1522 }, 1523 { USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */ 1524 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */ 1525 }, 1526 { USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */ 1527 .driver_info = NO_UNION_NORMAL, /* has no union descriptor */ 1528 }, 1529 { USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */ 1530 }, 1531 { USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */ 1532 .driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on 1533 data interface instead of 1534 communications interface. 1535 Maybe we should define a new 1536 quirk for this. */ 1537 }, 1538 { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */ 1539 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */ 1540 }, 1541 { USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */ 1542 .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */ 1543 }, 1544 1545 /* Nokia S60 phones expose two ACM channels. The first is 1546 * a modem and is picked up by the standard AT-command 1547 * information below. The second is 'vendor-specific' but 1548 * is treated as a serial device at the S60 end, so we want 1549 * to expose it on Linux too. */ 1550 { NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */ 1551 { NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */ 1552 { NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */ 1553 { NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */ 1554 { NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */ 1555 { NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */ 1556 { NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */ 1557 { NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */ 1558 { NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */ 1559 { NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */ 1560 { NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */ 1561 { NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */ 1562 { NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */ 1563 { NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */ 1564 { NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */ 1565 { NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */ 1566 { NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */ 1567 { NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i */ 1568 { NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */ 1569 { NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */ 1570 { NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */ 1571 { NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic & */ 1572 { NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */ 1573 { NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */ 1574 { NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */ 1575 { NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */ 1576 { NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */ 1577 { NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */ 1578 { NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */ 1579 { NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */ 1580 { NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */ 1581 { NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB */ 1582 { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */ 1583 { NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */ 1584 { NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */ 1585 { NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */ 1586 { NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */ 1587 { NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */ 1588 { NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */ 1589 { NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3 */ 1590 { NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */ 1591 { NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */ 1592 { NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */ 1593 { NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */ 1594 1595 /* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */ 1596 1597 /* Support Lego NXT using pbLua firmware */ 1598 { USB_DEVICE(0x0694, 0xff00), 1599 .driver_info = NOT_A_MODEM, 1600 }, 1601 1602 /* control interfaces with various AT-command sets */ 1603 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, 1604 USB_CDC_ACM_PROTO_AT_V25TER) }, 1605 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, 1606 USB_CDC_ACM_PROTO_AT_PCCA101) }, 1607 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, 1608 USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) }, 1609 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, 1610 USB_CDC_ACM_PROTO_AT_GSM) }, 1611 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, 1612 USB_CDC_ACM_PROTO_AT_3G) }, 1613 { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, 1614 USB_CDC_ACM_PROTO_AT_CDMA) }, 1615 1616 { } 1617 }; 1618 1619 MODULE_DEVICE_TABLE(usb, acm_ids); 1620 1621 static struct usb_driver acm_driver = { 1622 .name = "cdc_acm", 1623 .probe = acm_probe, 1624 .disconnect = acm_disconnect, 1625 #ifdef CONFIG_PM 1626 .suspend = acm_suspend, 1627 .resume = acm_resume, 1628 .reset_resume = acm_reset_resume, 1629 #endif 1630 .id_table = acm_ids, 1631 #ifdef CONFIG_PM 1632 .supports_autosuspend = 1, 1633 #endif 1634 }; 1635 1636 /* 1637 * TTY driver structures. 1638 */ 1639 1640 static const struct tty_operations acm_ops = { 1641 .open = acm_tty_open, 1642 .close = acm_tty_close, 1643 .hangup = acm_tty_hangup, 1644 .write = acm_tty_write, 1645 .write_room = acm_tty_write_room, 1646 .ioctl = acm_tty_ioctl, 1647 .throttle = acm_tty_throttle, 1648 .unthrottle = acm_tty_unthrottle, 1649 .chars_in_buffer = acm_tty_chars_in_buffer, 1650 .break_ctl = acm_tty_break_ctl, 1651 .set_termios = acm_tty_set_termios, 1652 .tiocmget = acm_tty_tiocmget, 1653 .tiocmset = acm_tty_tiocmset, 1654 }; 1655 1656 /* 1657 * Init / exit. 1658 */ 1659 1660 static int __init acm_init(void) 1661 { 1662 int retval; 1663 acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS); 1664 if (!acm_tty_driver) 1665 return -ENOMEM; 1666 acm_tty_driver->owner = THIS_MODULE, 1667 acm_tty_driver->driver_name = "acm", 1668 acm_tty_driver->name = "ttyACM", 1669 acm_tty_driver->major = ACM_TTY_MAJOR, 1670 acm_tty_driver->minor_start = 0, 1671 acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL, 1672 acm_tty_driver->subtype = SERIAL_TYPE_NORMAL, 1673 acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; 1674 acm_tty_driver->init_termios = tty_std_termios; 1675 acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | 1676 HUPCL | CLOCAL; 1677 tty_set_operations(acm_tty_driver, &acm_ops); 1678 1679 retval = tty_register_driver(acm_tty_driver); 1680 if (retval) { 1681 put_tty_driver(acm_tty_driver); 1682 return retval; 1683 } 1684 1685 retval = usb_register(&acm_driver); 1686 if (retval) { 1687 tty_unregister_driver(acm_tty_driver); 1688 put_tty_driver(acm_tty_driver); 1689 return retval; 1690 } 1691 1692 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":" 1693 DRIVER_DESC "\n"); 1694 1695 return 0; 1696 } 1697 1698 static void __exit acm_exit(void) 1699 { 1700 usb_deregister(&acm_driver); 1701 tty_unregister_driver(acm_tty_driver); 1702 put_tty_driver(acm_tty_driver); 1703 } 1704 1705 module_init(acm_init); 1706 module_exit(acm_exit); 1707 1708 MODULE_AUTHOR(DRIVER_AUTHOR); 1709 MODULE_DESCRIPTION(DRIVER_DESC); 1710 MODULE_LICENSE("GPL"); 1711 MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR); 1712