Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * cdc-acm.c |
| 3 | * |
| 4 | * Copyright (c) 1999 Armin Fuerst <fuerst@in.tum.de> |
| 5 | * Copyright (c) 1999 Pavel Machek <pavel@suse.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 | * |
| 10 | * USB Abstract Control Model driver for USB modems and ISDN adapters |
| 11 | * |
| 12 | * Sponsored by SuSE |
| 13 | * |
| 14 | * ChangeLog: |
| 15 | * v0.9 - thorough cleaning, URBification, almost a rewrite |
| 16 | * v0.10 - some more cleanups |
| 17 | * v0.11 - fixed flow control, read error doesn't stop reads |
| 18 | * v0.12 - added TIOCM ioctls, added break handling, made struct acm kmalloced |
| 19 | * v0.13 - added termios, added hangup |
| 20 | * v0.14 - sized down struct acm |
| 21 | * v0.15 - fixed flow control again - characters could be lost |
| 22 | * v0.16 - added code for modems with swapped data and control interfaces |
| 23 | * v0.17 - added new style probing |
| 24 | * v0.18 - fixed new style probing for devices with more configurations |
| 25 | * v0.19 - fixed CLOCAL handling (thanks to Richard Shih-Ping Chan) |
| 26 | * v0.20 - switched to probing on interface (rather than device) class |
| 27 | * v0.21 - revert to probing on device for devices with multiple configs |
| 28 | * v0.22 - probe only the control interface. if usbcore doesn't choose the |
| 29 | * config we want, sysadmin changes bConfigurationValue in sysfs. |
| 30 | * v0.23 - use softirq for rx processing, as needed by tty layer |
| 31 | * v0.24 - change probe method to evaluate CDC union descriptor |
| 32 | */ |
| 33 | |
| 34 | /* |
| 35 | * This program is free software; you can redistribute it and/or modify |
| 36 | * it under the terms of the GNU General Public License as published by |
| 37 | * the Free Software Foundation; either version 2 of the License, or |
| 38 | * (at your option) any later version. |
| 39 | * |
| 40 | * This program is distributed in the hope that it will be useful, |
| 41 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 42 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 43 | * GNU General Public License for more details. |
| 44 | * |
| 45 | * You should have received a copy of the GNU General Public License |
| 46 | * along with this program; if not, write to the Free Software |
| 47 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 48 | */ |
| 49 | |
| 50 | #undef DEBUG |
| 51 | |
| 52 | #include <linux/kernel.h> |
| 53 | #include <linux/errno.h> |
| 54 | #include <linux/init.h> |
| 55 | #include <linux/slab.h> |
| 56 | #include <linux/tty.h> |
| 57 | #include <linux/tty_driver.h> |
| 58 | #include <linux/tty_flip.h> |
| 59 | #include <linux/module.h> |
| 60 | #include <linux/smp_lock.h> |
| 61 | #include <asm/uaccess.h> |
| 62 | #include <linux/usb.h> |
| 63 | #include <linux/usb_cdc.h> |
| 64 | #include <asm/byteorder.h> |
| 65 | #include <asm/unaligned.h> |
| 66 | |
| 67 | #include "cdc-acm.h" |
| 68 | |
| 69 | /* |
| 70 | * Version Information |
| 71 | */ |
| 72 | #define DRIVER_VERSION "v0.23" |
| 73 | #define DRIVER_AUTHOR "Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik" |
| 74 | #define DRIVER_DESC "USB Abstract Control Model driver for USB modems and ISDN adapters" |
| 75 | |
| 76 | static struct usb_driver acm_driver; |
| 77 | static struct tty_driver *acm_tty_driver; |
| 78 | static struct acm *acm_table[ACM_TTY_MINORS]; |
| 79 | |
| 80 | static DECLARE_MUTEX(open_sem); |
| 81 | |
| 82 | #define ACM_READY(acm) (acm && acm->dev && acm->used) |
| 83 | |
| 84 | /* |
| 85 | * Functions for ACM control messages. |
| 86 | */ |
| 87 | |
| 88 | static int acm_ctrl_msg(struct acm *acm, int request, int value, void *buf, int len) |
| 89 | { |
| 90 | int retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0), |
| 91 | request, USB_RT_ACM, value, |
| 92 | acm->control->altsetting[0].desc.bInterfaceNumber, |
| 93 | buf, len, 5000); |
| 94 | dbg("acm_control_msg: rq: 0x%02x val: %#x len: %#x result: %d", request, value, len, retval); |
| 95 | return retval < 0 ? retval : 0; |
| 96 | } |
| 97 | |
| 98 | /* devices aren't required to support these requests. |
| 99 | * the cdc acm descriptor tells whether they do... |
| 100 | */ |
| 101 | #define acm_set_control(acm, control) \ |
| 102 | acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE, control, NULL, 0) |
| 103 | #define acm_set_line(acm, line) \ |
| 104 | acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line)) |
| 105 | #define acm_send_break(acm, ms) \ |
| 106 | acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0) |
| 107 | |
| 108 | /* |
Oliver Neukum | 884b600 | 2005-04-21 21:28:02 +0200 | [diff] [blame^] | 109 | * Write buffer management. |
| 110 | * All of these assume proper locks taken by the caller. |
| 111 | */ |
| 112 | |
| 113 | static int acm_wb_alloc(struct acm *acm) |
| 114 | { |
| 115 | int i, wbn; |
| 116 | struct acm_wb *wb; |
| 117 | |
| 118 | wbn = acm->write_current; |
| 119 | i = 0; |
| 120 | for (;;) { |
| 121 | wb = &acm->wb[wbn]; |
| 122 | if (!wb->use) { |
| 123 | wb->use = 1; |
| 124 | return wbn; |
| 125 | } |
| 126 | wbn = (wbn + 1) % ACM_NWB; |
| 127 | if (++i >= ACM_NWB) |
| 128 | return -1; |
| 129 | } |
| 130 | } |
| 131 | |
| 132 | static void acm_wb_free(struct acm *acm, int wbn) |
| 133 | { |
| 134 | acm->wb[wbn].use = 0; |
| 135 | } |
| 136 | |
| 137 | static int acm_wb_is_avail(struct acm *acm) |
| 138 | { |
| 139 | int i, n; |
| 140 | |
| 141 | n = 0; |
| 142 | for (i = 0; i < ACM_NWB; i++) { |
| 143 | if (!acm->wb[i].use) |
| 144 | n++; |
| 145 | } |
| 146 | return n; |
| 147 | } |
| 148 | |
| 149 | static inline int acm_wb_is_used(struct acm *acm, int wbn) |
| 150 | { |
| 151 | return acm->wb[wbn].use; |
| 152 | } |
| 153 | |
| 154 | /* |
| 155 | * Finish write. |
| 156 | */ |
| 157 | static void acm_write_done(struct acm *acm) |
| 158 | { |
| 159 | unsigned long flags; |
| 160 | int wbn; |
| 161 | |
| 162 | spin_lock_irqsave(&acm->write_lock, flags); |
| 163 | acm->write_ready = 1; |
| 164 | wbn = acm->write_current; |
| 165 | acm_wb_free(acm, wbn); |
| 166 | acm->write_current = (wbn + 1) % ACM_NWB; |
| 167 | spin_unlock_irqrestore(&acm->write_lock, flags); |
| 168 | } |
| 169 | |
| 170 | /* |
| 171 | * Poke write. |
| 172 | */ |
| 173 | static int acm_write_start(struct acm *acm) |
| 174 | { |
| 175 | unsigned long flags; |
| 176 | int wbn; |
| 177 | struct acm_wb *wb; |
| 178 | int rc; |
| 179 | |
| 180 | spin_lock_irqsave(&acm->write_lock, flags); |
| 181 | if (!acm->dev) { |
| 182 | spin_unlock_irqrestore(&acm->write_lock, flags); |
| 183 | return -ENODEV; |
| 184 | } |
| 185 | |
| 186 | if (!acm->write_ready) { |
| 187 | spin_unlock_irqrestore(&acm->write_lock, flags); |
| 188 | return 0; /* A white lie */ |
| 189 | } |
| 190 | |
| 191 | wbn = acm->write_current; |
| 192 | if (!acm_wb_is_used(acm, wbn)) { |
| 193 | spin_unlock_irqrestore(&acm->write_lock, flags); |
| 194 | return 0; |
| 195 | } |
| 196 | wb = &acm->wb[wbn]; |
| 197 | |
| 198 | acm->write_ready = 0; |
| 199 | spin_unlock_irqrestore(&acm->write_lock, flags); |
| 200 | |
| 201 | acm->writeurb->transfer_buffer = wb->buf; |
| 202 | acm->writeurb->transfer_dma = wb->dmah; |
| 203 | acm->writeurb->transfer_buffer_length = wb->len; |
| 204 | acm->writeurb->dev = acm->dev; |
| 205 | |
| 206 | if ((rc = usb_submit_urb(acm->writeurb, GFP_ATOMIC)) < 0) { |
| 207 | dbg("usb_submit_urb(write bulk) failed: %d", rc); |
| 208 | acm_write_done(acm); |
| 209 | } |
| 210 | return rc; |
| 211 | } |
| 212 | |
| 213 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | * Interrupt handlers for various ACM device responses |
| 215 | */ |
| 216 | |
| 217 | /* control interface reports status changes with "interrupt" transfers */ |
| 218 | static void acm_ctrl_irq(struct urb *urb, struct pt_regs *regs) |
| 219 | { |
| 220 | struct acm *acm = urb->context; |
| 221 | struct usb_cdc_notification *dr = urb->transfer_buffer; |
| 222 | unsigned char *data; |
| 223 | int newctrl; |
| 224 | int status; |
| 225 | |
| 226 | switch (urb->status) { |
| 227 | case 0: |
| 228 | /* success */ |
| 229 | break; |
| 230 | case -ECONNRESET: |
| 231 | case -ENOENT: |
| 232 | case -ESHUTDOWN: |
| 233 | /* this urb is terminated, clean up */ |
| 234 | dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status); |
| 235 | return; |
| 236 | default: |
| 237 | dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status); |
| 238 | goto exit; |
| 239 | } |
| 240 | |
| 241 | if (!ACM_READY(acm)) |
| 242 | goto exit; |
| 243 | |
| 244 | data = (unsigned char *)(dr + 1); |
| 245 | switch (dr->bNotificationType) { |
| 246 | |
| 247 | case USB_CDC_NOTIFY_NETWORK_CONNECTION: |
| 248 | |
| 249 | dbg("%s network", dr->wValue ? "connected to" : "disconnected from"); |
| 250 | break; |
| 251 | |
| 252 | case USB_CDC_NOTIFY_SERIAL_STATE: |
| 253 | |
| 254 | newctrl = le16_to_cpu(get_unaligned((__le16 *) data)); |
| 255 | |
| 256 | if (acm->tty && !acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) { |
| 257 | dbg("calling hangup"); |
| 258 | tty_hangup(acm->tty); |
| 259 | } |
| 260 | |
| 261 | acm->ctrlin = newctrl; |
| 262 | |
| 263 | dbg("input control lines: dcd%c dsr%c break%c ring%c framing%c parity%c overrun%c", |
| 264 | acm->ctrlin & ACM_CTRL_DCD ? '+' : '-', acm->ctrlin & ACM_CTRL_DSR ? '+' : '-', |
| 265 | acm->ctrlin & ACM_CTRL_BRK ? '+' : '-', acm->ctrlin & ACM_CTRL_RI ? '+' : '-', |
| 266 | acm->ctrlin & ACM_CTRL_FRAMING ? '+' : '-', acm->ctrlin & ACM_CTRL_PARITY ? '+' : '-', |
| 267 | acm->ctrlin & ACM_CTRL_OVERRUN ? '+' : '-'); |
| 268 | |
| 269 | break; |
| 270 | |
| 271 | default: |
| 272 | dbg("unknown notification %d received: index %d len %d data0 %d data1 %d", |
| 273 | dr->bNotificationType, dr->wIndex, |
| 274 | dr->wLength, data[0], data[1]); |
| 275 | break; |
| 276 | } |
| 277 | exit: |
| 278 | status = usb_submit_urb (urb, GFP_ATOMIC); |
| 279 | if (status) |
| 280 | err ("%s - usb_submit_urb failed with result %d", |
| 281 | __FUNCTION__, status); |
| 282 | } |
| 283 | |
| 284 | /* data interface returns incoming bytes, or we got unthrottled */ |
| 285 | static void acm_read_bulk(struct urb *urb, struct pt_regs *regs) |
| 286 | { |
| 287 | struct acm *acm = urb->context; |
| 288 | dbg("Entering acm_read_bulk with status %d\n", urb->status); |
| 289 | |
| 290 | if (!ACM_READY(acm)) |
| 291 | return; |
| 292 | |
| 293 | if (urb->status) |
| 294 | dev_dbg(&acm->data->dev, "bulk rx status %d\n", urb->status); |
| 295 | |
| 296 | /* calling tty_flip_buffer_push() in_irq() isn't allowed */ |
| 297 | tasklet_schedule(&acm->bh); |
| 298 | } |
| 299 | |
| 300 | static void acm_rx_tasklet(unsigned long _acm) |
| 301 | { |
| 302 | struct acm *acm = (void *)_acm; |
| 303 | struct urb *urb = acm->readurb; |
| 304 | struct tty_struct *tty = acm->tty; |
| 305 | unsigned char *data = urb->transfer_buffer; |
| 306 | int i = 0; |
| 307 | dbg("Entering acm_rx_tasklet"); |
| 308 | |
| 309 | if (urb->actual_length > 0 && !acm->throttle) { |
| 310 | for (i = 0; i < urb->actual_length && !acm->throttle; i++) { |
| 311 | /* if we insert more than TTY_FLIPBUF_SIZE characters, |
| 312 | * we drop them. */ |
| 313 | if (tty->flip.count >= TTY_FLIPBUF_SIZE) { |
| 314 | tty_flip_buffer_push(tty); |
| 315 | } |
| 316 | tty_insert_flip_char(tty, data[i], 0); |
| 317 | } |
| 318 | dbg("Handed %d bytes to tty layer", i+1); |
| 319 | tty_flip_buffer_push(tty); |
| 320 | } |
| 321 | |
| 322 | spin_lock(&acm->throttle_lock); |
| 323 | if (acm->throttle) { |
| 324 | dbg("Throtteling noticed"); |
| 325 | memmove(data, data + i, urb->actual_length - i); |
| 326 | urb->actual_length -= i; |
| 327 | acm->resubmit_to_unthrottle = 1; |
| 328 | spin_unlock(&acm->throttle_lock); |
| 329 | return; |
| 330 | } |
| 331 | spin_unlock(&acm->throttle_lock); |
| 332 | |
| 333 | urb->actual_length = 0; |
| 334 | urb->dev = acm->dev; |
| 335 | |
| 336 | i = usb_submit_urb(urb, GFP_ATOMIC); |
| 337 | if (i) |
| 338 | dev_dbg(&acm->data->dev, "bulk rx resubmit %d\n", i); |
| 339 | } |
| 340 | |
| 341 | /* data interface wrote those outgoing bytes */ |
| 342 | static void acm_write_bulk(struct urb *urb, struct pt_regs *regs) |
| 343 | { |
| 344 | struct acm *acm = (struct acm *)urb->context; |
Oliver Neukum | 884b600 | 2005-04-21 21:28:02 +0200 | [diff] [blame^] | 345 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | dbg("Entering acm_write_bulk with status %d\n", urb->status); |
| 347 | |
Oliver Neukum | 884b600 | 2005-04-21 21:28:02 +0200 | [diff] [blame^] | 348 | acm_write_done(acm); |
| 349 | acm_write_start(acm); |
| 350 | if (ACM_READY(acm)) |
| 351 | schedule_work(&acm->work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | } |
| 353 | |
| 354 | static void acm_softint(void *private) |
| 355 | { |
| 356 | struct acm *acm = private; |
| 357 | dbg("Entering acm_softint.\n"); |
| 358 | |
| 359 | if (!ACM_READY(acm)) |
| 360 | return; |
| 361 | tty_wakeup(acm->tty); |
| 362 | } |
| 363 | |
| 364 | /* |
| 365 | * TTY handlers |
| 366 | */ |
| 367 | |
| 368 | static int acm_tty_open(struct tty_struct *tty, struct file *filp) |
| 369 | { |
| 370 | struct acm *acm; |
| 371 | int rv = -EINVAL; |
| 372 | dbg("Entering acm_tty_open.\n"); |
| 373 | |
| 374 | down(&open_sem); |
| 375 | |
| 376 | acm = acm_table[tty->index]; |
| 377 | if (!acm || !acm->dev) |
| 378 | goto err_out; |
| 379 | else |
| 380 | rv = 0; |
| 381 | |
| 382 | tty->driver_data = acm; |
| 383 | acm->tty = tty; |
| 384 | |
| 385 | |
| 386 | |
| 387 | if (acm->used++) { |
| 388 | goto done; |
| 389 | } |
| 390 | |
| 391 | acm->ctrlurb->dev = acm->dev; |
| 392 | if (usb_submit_urb(acm->ctrlurb, GFP_KERNEL)) { |
| 393 | dbg("usb_submit_urb(ctrl irq) failed"); |
| 394 | goto bail_out; |
| 395 | } |
| 396 | |
| 397 | acm->readurb->dev = acm->dev; |
| 398 | if (usb_submit_urb(acm->readurb, GFP_KERNEL)) { |
| 399 | dbg("usb_submit_urb(read bulk) failed"); |
| 400 | goto bail_out_and_unlink; |
| 401 | } |
| 402 | |
| 403 | if (0 > acm_set_control(acm, acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS)) |
| 404 | goto full_bailout; |
| 405 | |
| 406 | /* force low_latency on so that our tty_push actually forces the data through, |
| 407 | otherwise it is scheduled, and with high data rates data can get lost. */ |
| 408 | tty->low_latency = 1; |
| 409 | |
| 410 | done: |
| 411 | err_out: |
| 412 | up(&open_sem); |
| 413 | return rv; |
| 414 | |
| 415 | full_bailout: |
| 416 | usb_kill_urb(acm->readurb); |
| 417 | bail_out_and_unlink: |
| 418 | usb_kill_urb(acm->ctrlurb); |
| 419 | bail_out: |
| 420 | acm->used--; |
| 421 | up(&open_sem); |
| 422 | return -EIO; |
| 423 | } |
| 424 | |
| 425 | static void acm_tty_close(struct tty_struct *tty, struct file *filp) |
| 426 | { |
| 427 | struct acm *acm = tty->driver_data; |
| 428 | |
| 429 | if (!acm || !acm->used) |
| 430 | return; |
| 431 | |
| 432 | down(&open_sem); |
| 433 | if (!--acm->used) { |
| 434 | if (acm->dev) { |
| 435 | acm_set_control(acm, acm->ctrlout = 0); |
| 436 | usb_kill_urb(acm->ctrlurb); |
| 437 | usb_kill_urb(acm->writeurb); |
| 438 | usb_kill_urb(acm->readurb); |
| 439 | } else { |
| 440 | tty_unregister_device(acm_tty_driver, acm->minor); |
| 441 | acm_table[acm->minor] = NULL; |
| 442 | usb_free_urb(acm->ctrlurb); |
| 443 | usb_free_urb(acm->readurb); |
| 444 | usb_free_urb(acm->writeurb); |
| 445 | kfree(acm); |
| 446 | } |
| 447 | } |
| 448 | up(&open_sem); |
| 449 | } |
| 450 | |
| 451 | static int acm_tty_write(struct tty_struct *tty, const unsigned char *buf, int count) |
| 452 | { |
| 453 | struct acm *acm = tty->driver_data; |
| 454 | int stat; |
Oliver Neukum | 884b600 | 2005-04-21 21:28:02 +0200 | [diff] [blame^] | 455 | unsigned long flags; |
| 456 | int wbn; |
| 457 | struct acm_wb *wb; |
| 458 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | dbg("Entering acm_tty_write to write %d bytes,\n", count); |
| 460 | |
| 461 | if (!ACM_READY(acm)) |
| 462 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | if (!count) |
| 464 | return 0; |
| 465 | |
Oliver Neukum | 884b600 | 2005-04-21 21:28:02 +0200 | [diff] [blame^] | 466 | spin_lock_irqsave(&acm->write_lock, flags); |
| 467 | if ((wbn = acm_wb_alloc(acm)) < 0) { |
| 468 | spin_unlock_irqrestore(&acm->write_lock, flags); |
| 469 | acm_write_start(acm); |
| 470 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | } |
Oliver Neukum | 884b600 | 2005-04-21 21:28:02 +0200 | [diff] [blame^] | 472 | wb = &acm->wb[wbn]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | |
Oliver Neukum | 884b600 | 2005-04-21 21:28:02 +0200 | [diff] [blame^] | 474 | count = (count > acm->writesize) ? acm->writesize : count; |
| 475 | dbg("Get %d bytes...", count); |
| 476 | memcpy(wb->buf, buf, count); |
| 477 | wb->len = count; |
| 478 | spin_unlock_irqrestore(&acm->write_lock, flags); |
| 479 | |
| 480 | if ((stat = acm_write_start(acm)) < 0) |
| 481 | return stat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | return count; |
| 483 | } |
| 484 | |
| 485 | static int acm_tty_write_room(struct tty_struct *tty) |
| 486 | { |
| 487 | struct acm *acm = tty->driver_data; |
| 488 | if (!ACM_READY(acm)) |
| 489 | return -EINVAL; |
Oliver Neukum | 884b600 | 2005-04-21 21:28:02 +0200 | [diff] [blame^] | 490 | /* |
| 491 | * Do not let the line discipline to know that we have a reserve, |
| 492 | * or it might get too enthusiastic. |
| 493 | */ |
| 494 | return (acm->write_ready && acm_wb_is_avail(acm)) ? acm->writesize : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | } |
| 496 | |
| 497 | static int acm_tty_chars_in_buffer(struct tty_struct *tty) |
| 498 | { |
| 499 | struct acm *acm = tty->driver_data; |
| 500 | if (!ACM_READY(acm)) |
| 501 | return -EINVAL; |
Oliver Neukum | 884b600 | 2005-04-21 21:28:02 +0200 | [diff] [blame^] | 502 | /* |
| 503 | * This is inaccurate (overcounts), but it works. |
| 504 | */ |
| 505 | return (ACM_NWB - acm_wb_is_avail(acm)) * acm->writesize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | } |
| 507 | |
| 508 | static void acm_tty_throttle(struct tty_struct *tty) |
| 509 | { |
| 510 | struct acm *acm = tty->driver_data; |
| 511 | if (!ACM_READY(acm)) |
| 512 | return; |
| 513 | spin_lock_bh(&acm->throttle_lock); |
| 514 | acm->throttle = 1; |
| 515 | spin_unlock_bh(&acm->throttle_lock); |
| 516 | } |
| 517 | |
| 518 | static void acm_tty_unthrottle(struct tty_struct *tty) |
| 519 | { |
| 520 | struct acm *acm = tty->driver_data; |
| 521 | if (!ACM_READY(acm)) |
| 522 | return; |
| 523 | spin_lock_bh(&acm->throttle_lock); |
| 524 | acm->throttle = 0; |
| 525 | spin_unlock_bh(&acm->throttle_lock); |
| 526 | if (acm->resubmit_to_unthrottle) { |
| 527 | acm->resubmit_to_unthrottle = 0; |
| 528 | acm_read_bulk(acm->readurb, NULL); |
| 529 | } |
| 530 | } |
| 531 | |
| 532 | static void acm_tty_break_ctl(struct tty_struct *tty, int state) |
| 533 | { |
| 534 | struct acm *acm = tty->driver_data; |
| 535 | if (!ACM_READY(acm)) |
| 536 | return; |
| 537 | if (acm_send_break(acm, state ? 0xffff : 0)) |
| 538 | dbg("send break failed"); |
| 539 | } |
| 540 | |
| 541 | static int acm_tty_tiocmget(struct tty_struct *tty, struct file *file) |
| 542 | { |
| 543 | struct acm *acm = tty->driver_data; |
| 544 | |
| 545 | if (!ACM_READY(acm)) |
| 546 | return -EINVAL; |
| 547 | |
| 548 | return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) | |
| 549 | (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) | |
| 550 | (acm->ctrlin & ACM_CTRL_DSR ? TIOCM_DSR : 0) | |
| 551 | (acm->ctrlin & ACM_CTRL_RI ? TIOCM_RI : 0) | |
| 552 | (acm->ctrlin & ACM_CTRL_DCD ? TIOCM_CD : 0) | |
| 553 | TIOCM_CTS; |
| 554 | } |
| 555 | |
| 556 | static int acm_tty_tiocmset(struct tty_struct *tty, struct file *file, |
| 557 | unsigned int set, unsigned int clear) |
| 558 | { |
| 559 | struct acm *acm = tty->driver_data; |
| 560 | unsigned int newctrl; |
| 561 | |
| 562 | if (!ACM_READY(acm)) |
| 563 | return -EINVAL; |
| 564 | |
| 565 | newctrl = acm->ctrlout; |
| 566 | set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) | (set & TIOCM_RTS ? ACM_CTRL_RTS : 0); |
| 567 | clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) | (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0); |
| 568 | |
| 569 | newctrl = (newctrl & ~clear) | set; |
| 570 | |
| 571 | if (acm->ctrlout == newctrl) |
| 572 | return 0; |
| 573 | return acm_set_control(acm, acm->ctrlout = newctrl); |
| 574 | } |
| 575 | |
| 576 | static int acm_tty_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg) |
| 577 | { |
| 578 | struct acm *acm = tty->driver_data; |
| 579 | |
| 580 | if (!ACM_READY(acm)) |
| 581 | return -EINVAL; |
| 582 | |
| 583 | return -ENOIOCTLCMD; |
| 584 | } |
| 585 | |
| 586 | static __u32 acm_tty_speed[] = { |
| 587 | 0, 50, 75, 110, 134, 150, 200, 300, 600, |
| 588 | 1200, 1800, 2400, 4800, 9600, 19200, 38400, |
| 589 | 57600, 115200, 230400, 460800, 500000, 576000, |
| 590 | 921600, 1000000, 1152000, 1500000, 2000000, |
| 591 | 2500000, 3000000, 3500000, 4000000 |
| 592 | }; |
| 593 | |
| 594 | static __u8 acm_tty_size[] = { |
| 595 | 5, 6, 7, 8 |
| 596 | }; |
| 597 | |
| 598 | static void acm_tty_set_termios(struct tty_struct *tty, struct termios *termios_old) |
| 599 | { |
| 600 | struct acm *acm = tty->driver_data; |
| 601 | struct termios *termios = tty->termios; |
| 602 | struct usb_cdc_line_coding newline; |
| 603 | int newctrl = acm->ctrlout; |
| 604 | |
| 605 | if (!ACM_READY(acm)) |
| 606 | return; |
| 607 | |
| 608 | newline.dwDTERate = cpu_to_le32p(acm_tty_speed + |
| 609 | (termios->c_cflag & CBAUD & ~CBAUDEX) + (termios->c_cflag & CBAUDEX ? 15 : 0)); |
| 610 | newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0; |
| 611 | newline.bParityType = termios->c_cflag & PARENB ? |
| 612 | (termios->c_cflag & PARODD ? 1 : 2) + (termios->c_cflag & CMSPAR ? 2 : 0) : 0; |
| 613 | newline.bDataBits = acm_tty_size[(termios->c_cflag & CSIZE) >> 4]; |
| 614 | |
| 615 | acm->clocal = ((termios->c_cflag & CLOCAL) != 0); |
| 616 | |
| 617 | if (!newline.dwDTERate) { |
| 618 | newline.dwDTERate = acm->line.dwDTERate; |
| 619 | newctrl &= ~ACM_CTRL_DTR; |
| 620 | } else newctrl |= ACM_CTRL_DTR; |
| 621 | |
| 622 | if (newctrl != acm->ctrlout) |
| 623 | acm_set_control(acm, acm->ctrlout = newctrl); |
| 624 | |
| 625 | if (memcmp(&acm->line, &newline, sizeof newline)) { |
| 626 | memcpy(&acm->line, &newline, sizeof newline); |
| 627 | dbg("set line: %d %d %d %d", le32_to_cpu(newline.dwDTERate), |
| 628 | newline.bCharFormat, newline.bParityType, |
| 629 | newline.bDataBits); |
| 630 | acm_set_line(acm, &acm->line); |
| 631 | } |
| 632 | } |
| 633 | |
| 634 | /* |
| 635 | * USB probe and disconnect routines. |
| 636 | */ |
| 637 | |
Oliver Neukum | 884b600 | 2005-04-21 21:28:02 +0200 | [diff] [blame^] | 638 | /* Little helper: write buffers free */ |
| 639 | static void acm_write_buffers_free(struct acm *acm) |
| 640 | { |
| 641 | int i; |
| 642 | struct acm_wb *wb; |
| 643 | |
| 644 | for (wb = &acm->wb[0], i = 0; i < ACM_NWB; i++, wb++) { |
| 645 | usb_buffer_free(acm->dev, acm->writesize, wb->buf, wb->dmah); |
| 646 | } |
| 647 | } |
| 648 | |
| 649 | /* Little helper: write buffers allocate */ |
| 650 | static int acm_write_buffers_alloc(struct acm *acm) |
| 651 | { |
| 652 | int i; |
| 653 | struct acm_wb *wb; |
| 654 | |
| 655 | for (wb = &acm->wb[0], i = 0; i < ACM_NWB; i++, wb++) { |
| 656 | wb->buf = usb_buffer_alloc(acm->dev, acm->writesize, GFP_KERNEL, |
| 657 | &wb->dmah); |
| 658 | if (!wb->buf) { |
| 659 | while (i != 0) { |
| 660 | --i; |
| 661 | --wb; |
| 662 | usb_buffer_free(acm->dev, acm->writesize, |
| 663 | wb->buf, wb->dmah); |
| 664 | } |
| 665 | return -ENOMEM; |
| 666 | } |
| 667 | } |
| 668 | return 0; |
| 669 | } |
| 670 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | static int acm_probe (struct usb_interface *intf, |
| 672 | const struct usb_device_id *id) |
| 673 | { |
| 674 | struct usb_cdc_union_desc *union_header = NULL; |
| 675 | char *buffer = intf->altsetting->extra; |
| 676 | int buflen = intf->altsetting->extralen; |
| 677 | struct usb_interface *control_interface; |
| 678 | struct usb_interface *data_interface; |
| 679 | struct usb_endpoint_descriptor *epctrl; |
| 680 | struct usb_endpoint_descriptor *epread; |
| 681 | struct usb_endpoint_descriptor *epwrite; |
| 682 | struct usb_device *usb_dev = interface_to_usbdev(intf); |
| 683 | struct acm *acm; |
| 684 | int minor; |
| 685 | int ctrlsize,readsize; |
| 686 | u8 *buf; |
| 687 | u8 ac_management_function = 0; |
| 688 | u8 call_management_function = 0; |
| 689 | int call_interface_num = -1; |
| 690 | int data_interface_num; |
| 691 | unsigned long quirks; |
| 692 | |
| 693 | /* handle quirks deadly to normal probing*/ |
| 694 | quirks = (unsigned long)id->driver_info; |
| 695 | if (quirks == NO_UNION_NORMAL) { |
| 696 | data_interface = usb_ifnum_to_if(usb_dev, 1); |
| 697 | control_interface = usb_ifnum_to_if(usb_dev, 0); |
| 698 | goto skip_normal_probe; |
| 699 | } |
| 700 | |
| 701 | /* normal probing*/ |
| 702 | if (!buffer) { |
| 703 | err("Wierd descriptor references\n"); |
| 704 | return -EINVAL; |
| 705 | } |
| 706 | |
| 707 | if (!buflen) { |
| 708 | if (intf->cur_altsetting->endpoint->extralen && intf->cur_altsetting->endpoint->extra) { |
| 709 | dev_dbg(&intf->dev,"Seeking extra descriptors on endpoint\n"); |
| 710 | buflen = intf->cur_altsetting->endpoint->extralen; |
| 711 | buffer = intf->cur_altsetting->endpoint->extra; |
| 712 | } else { |
| 713 | err("Zero length descriptor references\n"); |
| 714 | return -EINVAL; |
| 715 | } |
| 716 | } |
| 717 | |
| 718 | while (buflen > 0) { |
| 719 | if (buffer [1] != USB_DT_CS_INTERFACE) { |
| 720 | err("skipping garbage\n"); |
| 721 | goto next_desc; |
| 722 | } |
| 723 | |
| 724 | switch (buffer [2]) { |
| 725 | case USB_CDC_UNION_TYPE: /* we've found it */ |
| 726 | if (union_header) { |
| 727 | err("More than one union descriptor, skipping ..."); |
| 728 | goto next_desc; |
| 729 | } |
| 730 | union_header = (struct usb_cdc_union_desc *) |
| 731 | buffer; |
| 732 | break; |
| 733 | case USB_CDC_COUNTRY_TYPE: /* maybe somehow export */ |
| 734 | break; /* for now we ignore it */ |
| 735 | case USB_CDC_HEADER_TYPE: /* maybe check version */ |
| 736 | break; /* for now we ignore it */ |
| 737 | case USB_CDC_ACM_TYPE: |
| 738 | ac_management_function = buffer[3]; |
| 739 | break; |
| 740 | case USB_CDC_CALL_MANAGEMENT_TYPE: |
| 741 | call_management_function = buffer[3]; |
| 742 | call_interface_num = buffer[4]; |
| 743 | if ((call_management_function & 3) != 3) |
| 744 | err("This device cannot do calls on its own. It is no modem."); |
| 745 | break; |
| 746 | |
| 747 | default: |
| 748 | err("Ignoring extra header, type %d, length %d", buffer[2], buffer[0]); |
| 749 | break; |
| 750 | } |
| 751 | next_desc: |
| 752 | buflen -= buffer[0]; |
| 753 | buffer += buffer[0]; |
| 754 | } |
| 755 | |
| 756 | if (!union_header) { |
| 757 | if (call_interface_num > 0) { |
| 758 | dev_dbg(&intf->dev,"No union descriptor, using call management descriptor\n"); |
| 759 | data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num)); |
| 760 | control_interface = intf; |
| 761 | } else { |
| 762 | dev_dbg(&intf->dev,"No union descriptor, giving up\n"); |
| 763 | return -ENODEV; |
| 764 | } |
| 765 | } else { |
| 766 | control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0); |
| 767 | data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0)); |
| 768 | if (!control_interface || !data_interface) { |
| 769 | dev_dbg(&intf->dev,"no interfaces\n"); |
| 770 | return -ENODEV; |
| 771 | } |
| 772 | } |
| 773 | |
| 774 | if (data_interface_num != call_interface_num) |
| 775 | dev_dbg(&intf->dev,"Seperate call control interface. That is not fully supported.\n"); |
| 776 | |
| 777 | skip_normal_probe: |
| 778 | |
| 779 | /*workaround for switched interfaces */ |
| 780 | if (data_interface->cur_altsetting->desc.bInterfaceClass != CDC_DATA_INTERFACE_TYPE) { |
| 781 | if (control_interface->cur_altsetting->desc.bInterfaceClass == CDC_DATA_INTERFACE_TYPE) { |
| 782 | struct usb_interface *t; |
| 783 | dev_dbg(&intf->dev,"Your device has switched interfaces.\n"); |
| 784 | |
| 785 | t = control_interface; |
| 786 | control_interface = data_interface; |
| 787 | data_interface = t; |
| 788 | } else { |
| 789 | return -EINVAL; |
| 790 | } |
| 791 | } |
| 792 | |
| 793 | if (usb_interface_claimed(data_interface)) { /* valid in this context */ |
| 794 | dev_dbg(&intf->dev,"The data interface isn't available\n"); |
| 795 | return -EBUSY; |
| 796 | } |
| 797 | |
| 798 | |
| 799 | if (data_interface->cur_altsetting->desc.bNumEndpoints < 2) |
| 800 | return -EINVAL; |
| 801 | |
| 802 | epctrl = &control_interface->cur_altsetting->endpoint[0].desc; |
| 803 | epread = &data_interface->cur_altsetting->endpoint[0].desc; |
| 804 | epwrite = &data_interface->cur_altsetting->endpoint[1].desc; |
| 805 | |
| 806 | |
| 807 | /* workaround for switched endpoints */ |
| 808 | if ((epread->bEndpointAddress & USB_DIR_IN) != USB_DIR_IN) { |
| 809 | /* descriptors are swapped */ |
| 810 | struct usb_endpoint_descriptor *t; |
| 811 | dev_dbg(&intf->dev,"The data interface has switched endpoints\n"); |
| 812 | |
| 813 | t = epread; |
| 814 | epread = epwrite; |
| 815 | epwrite = t; |
| 816 | } |
| 817 | dbg("interfaces are valid"); |
| 818 | for (minor = 0; minor < ACM_TTY_MINORS && acm_table[minor]; minor++); |
| 819 | |
| 820 | if (minor == ACM_TTY_MINORS) { |
| 821 | err("no more free acm devices"); |
| 822 | return -ENODEV; |
| 823 | } |
| 824 | |
| 825 | if (!(acm = kmalloc(sizeof(struct acm), GFP_KERNEL))) { |
| 826 | dev_dbg(&intf->dev, "out of memory (acm kmalloc)\n"); |
| 827 | goto alloc_fail; |
| 828 | } |
| 829 | memset(acm, 0, sizeof(struct acm)); |
| 830 | |
| 831 | ctrlsize = le16_to_cpu(epctrl->wMaxPacketSize); |
| 832 | readsize = le16_to_cpu(epread->wMaxPacketSize); |
| 833 | acm->writesize = le16_to_cpu(epwrite->wMaxPacketSize); |
| 834 | acm->control = control_interface; |
| 835 | acm->data = data_interface; |
| 836 | acm->minor = minor; |
| 837 | acm->dev = usb_dev; |
| 838 | acm->ctrl_caps = ac_management_function; |
| 839 | acm->ctrlsize = ctrlsize; |
| 840 | acm->readsize = readsize; |
| 841 | acm->bh.func = acm_rx_tasklet; |
| 842 | acm->bh.data = (unsigned long) acm; |
| 843 | INIT_WORK(&acm->work, acm_softint, acm); |
| 844 | spin_lock_init(&acm->throttle_lock); |
Oliver Neukum | 884b600 | 2005-04-21 21:28:02 +0200 | [diff] [blame^] | 845 | spin_lock_init(&acm->write_lock); |
| 846 | acm->write_ready = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | |
| 848 | buf = usb_buffer_alloc(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma); |
| 849 | if (!buf) { |
| 850 | dev_dbg(&intf->dev, "out of memory (ctrl buffer alloc)\n"); |
| 851 | goto alloc_fail2; |
| 852 | } |
| 853 | acm->ctrl_buffer = buf; |
| 854 | |
| 855 | buf = usb_buffer_alloc(usb_dev, readsize, GFP_KERNEL, &acm->read_dma); |
| 856 | if (!buf) { |
| 857 | dev_dbg(&intf->dev, "out of memory (read buffer alloc)\n"); |
| 858 | goto alloc_fail3; |
| 859 | } |
| 860 | acm->read_buffer = buf; |
| 861 | |
Oliver Neukum | 884b600 | 2005-04-21 21:28:02 +0200 | [diff] [blame^] | 862 | if (acm_write_buffers_alloc(acm) < 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | dev_dbg(&intf->dev, "out of memory (write buffer alloc)\n"); |
| 864 | goto alloc_fail4; |
| 865 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | |
| 867 | acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL); |
| 868 | if (!acm->ctrlurb) { |
| 869 | dev_dbg(&intf->dev, "out of memory (ctrlurb kmalloc)\n"); |
| 870 | goto alloc_fail5; |
| 871 | } |
| 872 | acm->readurb = usb_alloc_urb(0, GFP_KERNEL); |
| 873 | if (!acm->readurb) { |
| 874 | dev_dbg(&intf->dev, "out of memory (readurb kmalloc)\n"); |
| 875 | goto alloc_fail6; |
| 876 | } |
| 877 | acm->writeurb = usb_alloc_urb(0, GFP_KERNEL); |
| 878 | if (!acm->writeurb) { |
| 879 | dev_dbg(&intf->dev, "out of memory (writeurb kmalloc)\n"); |
| 880 | goto alloc_fail7; |
| 881 | } |
| 882 | |
| 883 | usb_fill_int_urb(acm->ctrlurb, usb_dev, usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress), |
| 884 | acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm, epctrl->bInterval); |
| 885 | acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; |
| 886 | acm->ctrlurb->transfer_dma = acm->ctrl_dma; |
| 887 | |
| 888 | usb_fill_bulk_urb(acm->readurb, usb_dev, usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress), |
| 889 | acm->read_buffer, readsize, acm_read_bulk, acm); |
| 890 | acm->readurb->transfer_flags |= URB_NO_FSBR | URB_NO_TRANSFER_DMA_MAP; |
| 891 | acm->readurb->transfer_dma = acm->read_dma; |
| 892 | |
| 893 | usb_fill_bulk_urb(acm->writeurb, usb_dev, usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress), |
Oliver Neukum | 884b600 | 2005-04-21 21:28:02 +0200 | [diff] [blame^] | 894 | NULL, acm->writesize, acm_write_bulk, acm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | acm->writeurb->transfer_flags |= URB_NO_FSBR | URB_NO_TRANSFER_DMA_MAP; |
Oliver Neukum | 884b600 | 2005-04-21 21:28:02 +0200 | [diff] [blame^] | 896 | /* acm->writeurb->transfer_dma = 0; */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | |
| 898 | dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor); |
| 899 | |
| 900 | acm_set_control(acm, acm->ctrlout); |
| 901 | |
| 902 | acm->line.dwDTERate = cpu_to_le32(9600); |
| 903 | acm->line.bDataBits = 8; |
| 904 | acm_set_line(acm, &acm->line); |
| 905 | |
| 906 | usb_driver_claim_interface(&acm_driver, data_interface, acm); |
| 907 | |
| 908 | tty_register_device(acm_tty_driver, minor, &intf->dev); |
| 909 | |
| 910 | acm_table[minor] = acm; |
| 911 | usb_set_intfdata (intf, acm); |
| 912 | return 0; |
| 913 | |
| 914 | alloc_fail7: |
| 915 | usb_free_urb(acm->readurb); |
| 916 | alloc_fail6: |
| 917 | usb_free_urb(acm->ctrlurb); |
| 918 | alloc_fail5: |
Oliver Neukum | 884b600 | 2005-04-21 21:28:02 +0200 | [diff] [blame^] | 919 | acm_write_buffers_free(acm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | alloc_fail4: |
| 921 | usb_buffer_free(usb_dev, readsize, acm->read_buffer, acm->read_dma); |
| 922 | alloc_fail3: |
| 923 | usb_buffer_free(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma); |
| 924 | alloc_fail2: |
| 925 | kfree(acm); |
| 926 | alloc_fail: |
| 927 | return -ENOMEM; |
| 928 | } |
| 929 | |
| 930 | static void acm_disconnect(struct usb_interface *intf) |
| 931 | { |
| 932 | struct acm *acm = usb_get_intfdata (intf); |
| 933 | struct usb_device *usb_dev = interface_to_usbdev(intf); |
| 934 | |
| 935 | if (!acm || !acm->dev) { |
| 936 | dbg("disconnect on nonexisting interface"); |
| 937 | return; |
| 938 | } |
| 939 | |
| 940 | down(&open_sem); |
| 941 | acm->dev = NULL; |
| 942 | usb_set_intfdata (intf, NULL); |
| 943 | |
| 944 | usb_kill_urb(acm->ctrlurb); |
| 945 | usb_kill_urb(acm->readurb); |
| 946 | usb_kill_urb(acm->writeurb); |
| 947 | |
| 948 | flush_scheduled_work(); /* wait for acm_softint */ |
| 949 | |
Oliver Neukum | 884b600 | 2005-04-21 21:28:02 +0200 | [diff] [blame^] | 950 | acm_write_buffers_free(acm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | usb_buffer_free(usb_dev, acm->readsize, acm->read_buffer, acm->read_dma); |
| 952 | usb_buffer_free(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma); |
| 953 | |
| 954 | usb_driver_release_interface(&acm_driver, acm->data); |
| 955 | |
| 956 | if (!acm->used) { |
| 957 | tty_unregister_device(acm_tty_driver, acm->minor); |
| 958 | acm_table[acm->minor] = NULL; |
| 959 | usb_free_urb(acm->ctrlurb); |
| 960 | usb_free_urb(acm->readurb); |
| 961 | usb_free_urb(acm->writeurb); |
| 962 | kfree(acm); |
| 963 | up(&open_sem); |
| 964 | return; |
| 965 | } |
| 966 | |
| 967 | up(&open_sem); |
| 968 | |
| 969 | if (acm->tty) |
| 970 | tty_hangup(acm->tty); |
| 971 | } |
| 972 | |
| 973 | /* |
| 974 | * USB driver structure. |
| 975 | */ |
| 976 | |
| 977 | static struct usb_device_id acm_ids[] = { |
| 978 | /* quirky and broken devices */ |
| 979 | { USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */ |
| 980 | .driver_info = NO_UNION_NORMAL, /* has no union descriptor */ |
| 981 | }, |
| 982 | /* control interfaces with various AT-command sets */ |
| 983 | { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, |
| 984 | USB_CDC_ACM_PROTO_AT_V25TER) }, |
| 985 | { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, |
| 986 | USB_CDC_ACM_PROTO_AT_PCCA101) }, |
| 987 | { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, |
| 988 | USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) }, |
| 989 | { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, |
| 990 | USB_CDC_ACM_PROTO_AT_GSM) }, |
| 991 | { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, |
| 992 | USB_CDC_ACM_PROTO_AT_3G ) }, |
| 993 | { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, |
| 994 | USB_CDC_ACM_PROTO_AT_CDMA) }, |
| 995 | |
| 996 | /* NOTE: COMM/ACM/0xff is likely MSFT RNDIS ... NOT a modem!! */ |
| 997 | { } |
| 998 | }; |
| 999 | |
| 1000 | MODULE_DEVICE_TABLE (usb, acm_ids); |
| 1001 | |
| 1002 | static struct usb_driver acm_driver = { |
| 1003 | .owner = THIS_MODULE, |
| 1004 | .name = "cdc_acm", |
| 1005 | .probe = acm_probe, |
| 1006 | .disconnect = acm_disconnect, |
| 1007 | .id_table = acm_ids, |
| 1008 | }; |
| 1009 | |
| 1010 | /* |
| 1011 | * TTY driver structures. |
| 1012 | */ |
| 1013 | |
| 1014 | static struct tty_operations acm_ops = { |
| 1015 | .open = acm_tty_open, |
| 1016 | .close = acm_tty_close, |
| 1017 | .write = acm_tty_write, |
| 1018 | .write_room = acm_tty_write_room, |
| 1019 | .ioctl = acm_tty_ioctl, |
| 1020 | .throttle = acm_tty_throttle, |
| 1021 | .unthrottle = acm_tty_unthrottle, |
| 1022 | .chars_in_buffer = acm_tty_chars_in_buffer, |
| 1023 | .break_ctl = acm_tty_break_ctl, |
| 1024 | .set_termios = acm_tty_set_termios, |
| 1025 | .tiocmget = acm_tty_tiocmget, |
| 1026 | .tiocmset = acm_tty_tiocmset, |
| 1027 | }; |
| 1028 | |
| 1029 | /* |
| 1030 | * Init / exit. |
| 1031 | */ |
| 1032 | |
| 1033 | static int __init acm_init(void) |
| 1034 | { |
| 1035 | int retval; |
| 1036 | acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS); |
| 1037 | if (!acm_tty_driver) |
| 1038 | return -ENOMEM; |
| 1039 | acm_tty_driver->owner = THIS_MODULE, |
| 1040 | acm_tty_driver->driver_name = "acm", |
| 1041 | acm_tty_driver->name = "ttyACM", |
| 1042 | acm_tty_driver->devfs_name = "usb/acm/", |
| 1043 | acm_tty_driver->major = ACM_TTY_MAJOR, |
| 1044 | acm_tty_driver->minor_start = 0, |
| 1045 | acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL, |
| 1046 | acm_tty_driver->subtype = SERIAL_TYPE_NORMAL, |
| 1047 | acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_NO_DEVFS, |
| 1048 | acm_tty_driver->init_termios = tty_std_termios; |
| 1049 | acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; |
| 1050 | tty_set_operations(acm_tty_driver, &acm_ops); |
| 1051 | |
| 1052 | retval = tty_register_driver(acm_tty_driver); |
| 1053 | if (retval) { |
| 1054 | put_tty_driver(acm_tty_driver); |
| 1055 | return retval; |
| 1056 | } |
| 1057 | |
| 1058 | retval = usb_register(&acm_driver); |
| 1059 | if (retval) { |
| 1060 | tty_unregister_driver(acm_tty_driver); |
| 1061 | put_tty_driver(acm_tty_driver); |
| 1062 | return retval; |
| 1063 | } |
| 1064 | |
| 1065 | info(DRIVER_VERSION ":" DRIVER_DESC); |
| 1066 | |
| 1067 | return 0; |
| 1068 | } |
| 1069 | |
| 1070 | static void __exit acm_exit(void) |
| 1071 | { |
| 1072 | usb_deregister(&acm_driver); |
| 1073 | tty_unregister_driver(acm_tty_driver); |
| 1074 | put_tty_driver(acm_tty_driver); |
| 1075 | } |
| 1076 | |
| 1077 | module_init(acm_init); |
| 1078 | module_exit(acm_exit); |
| 1079 | |
| 1080 | MODULE_AUTHOR( DRIVER_AUTHOR ); |
| 1081 | MODULE_DESCRIPTION( DRIVER_DESC ); |
| 1082 | MODULE_LICENSE("GPL"); |
| 1083 | |