| 1 | /* |
| 2 | * USB Serial Converter driver |
| 3 | * |
| 4 | * Copyright (C) 1999 - 2005 Greg Kroah-Hartman (greg@kroah.com) |
| 5 | * Copyright (C) 2000 Peter Berger (pberger@brimson.com) |
| 6 | * Copyright (C) 2000 Al Borchers (borchers@steinerpoint.com) |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License version |
| 10 | * 2 as published by the Free Software Foundation. |
| 11 | * |
| 12 | * This driver was originally based on the ACM driver by Armin Fuerst (which was |
| 13 | * based on a driver by Brad Keryan) |
| 14 | * |
| 15 | * See Documentation/usb/usb-serial.txt for more information on using this |
| 16 | * driver |
| 17 | * |
| 18 | */ |
| 19 | |
| 20 | #include <linux/kernel.h> |
| 21 | #include <linux/errno.h> |
| 22 | #include <linux/init.h> |
| 23 | #include <linux/slab.h> |
| 24 | #include <linux/tty.h> |
| 25 | #include <linux/tty_driver.h> |
| 26 | #include <linux/tty_flip.h> |
| 27 | #include <linux/module.h> |
| 28 | #include <linux/moduleparam.h> |
| 29 | #include <linux/spinlock.h> |
| 30 | #include <linux/mutex.h> |
| 31 | #include <linux/list.h> |
| 32 | #include <linux/uaccess.h> |
| 33 | #include <linux/usb.h> |
| 34 | #include <linux/usb/serial.h> |
| 35 | #include "pl2303.h" |
| 36 | |
| 37 | /* |
| 38 | * Version Information |
| 39 | */ |
| 40 | #define DRIVER_AUTHOR "Greg Kroah-Hartman, greg@kroah.com, http://www.kroah.com/linux/" |
| 41 | #define DRIVER_DESC "USB Serial Driver core" |
| 42 | |
| 43 | static void port_free(struct usb_serial_port *port); |
| 44 | |
| 45 | /* Driver structure we register with the USB core */ |
| 46 | static struct usb_driver usb_serial_driver = { |
| 47 | .name = "usbserial", |
| 48 | .probe = usb_serial_probe, |
| 49 | .disconnect = usb_serial_disconnect, |
| 50 | .suspend = usb_serial_suspend, |
| 51 | .resume = usb_serial_resume, |
| 52 | .no_dynamic_id = 1, |
| 53 | }; |
| 54 | |
| 55 | /* There is no MODULE_DEVICE_TABLE for usbserial.c. Instead |
| 56 | the MODULE_DEVICE_TABLE declarations in each serial driver |
| 57 | cause the "hotplug" program to pull in whatever module is necessary |
| 58 | via modprobe, and modprobe will load usbserial because the serial |
| 59 | drivers depend on it. |
| 60 | */ |
| 61 | |
| 62 | static int debug; |
| 63 | /* initially all NULL */ |
| 64 | static struct usb_serial *serial_table[SERIAL_TTY_MINORS]; |
| 65 | static DEFINE_MUTEX(table_lock); |
| 66 | static LIST_HEAD(usb_serial_driver_list); |
| 67 | |
| 68 | struct usb_serial *usb_serial_get_by_index(unsigned index) |
| 69 | { |
| 70 | struct usb_serial *serial; |
| 71 | |
| 72 | mutex_lock(&table_lock); |
| 73 | serial = serial_table[index]; |
| 74 | |
| 75 | if (serial) |
| 76 | kref_get(&serial->kref); |
| 77 | mutex_unlock(&table_lock); |
| 78 | return serial; |
| 79 | } |
| 80 | |
| 81 | static struct usb_serial *get_free_serial(struct usb_serial *serial, |
| 82 | int num_ports, unsigned int *minor) |
| 83 | { |
| 84 | unsigned int i, j; |
| 85 | int good_spot; |
| 86 | |
| 87 | dbg("%s %d", __func__, num_ports); |
| 88 | |
| 89 | *minor = 0; |
| 90 | mutex_lock(&table_lock); |
| 91 | for (i = 0; i < SERIAL_TTY_MINORS; ++i) { |
| 92 | if (serial_table[i]) |
| 93 | continue; |
| 94 | |
| 95 | good_spot = 1; |
| 96 | for (j = 1; j <= num_ports-1; ++j) |
| 97 | if ((i+j >= SERIAL_TTY_MINORS) || (serial_table[i+j])) { |
| 98 | good_spot = 0; |
| 99 | i += j; |
| 100 | break; |
| 101 | } |
| 102 | if (good_spot == 0) |
| 103 | continue; |
| 104 | |
| 105 | *minor = i; |
| 106 | j = 0; |
| 107 | dbg("%s - minor base = %d", __func__, *minor); |
| 108 | for (i = *minor; (i < (*minor + num_ports)) && (i < SERIAL_TTY_MINORS); ++i) { |
| 109 | serial_table[i] = serial; |
| 110 | serial->port[j++]->number = i; |
| 111 | } |
| 112 | mutex_unlock(&table_lock); |
| 113 | return serial; |
| 114 | } |
| 115 | mutex_unlock(&table_lock); |
| 116 | return NULL; |
| 117 | } |
| 118 | |
| 119 | static void return_serial(struct usb_serial *serial) |
| 120 | { |
| 121 | int i; |
| 122 | |
| 123 | dbg("%s", __func__); |
| 124 | |
| 125 | for (i = 0; i < serial->num_ports; ++i) |
| 126 | serial_table[serial->minor + i] = NULL; |
| 127 | } |
| 128 | |
| 129 | static void destroy_serial(struct kref *kref) |
| 130 | { |
| 131 | struct usb_serial *serial; |
| 132 | struct usb_serial_port *port; |
| 133 | int i; |
| 134 | |
| 135 | serial = to_usb_serial(kref); |
| 136 | |
| 137 | dbg("%s - %s", __func__, serial->type->description); |
| 138 | |
| 139 | serial->type->shutdown(serial); |
| 140 | |
| 141 | /* return the minor range that this device had */ |
| 142 | if (serial->minor != SERIAL_TTY_NO_MINOR) |
| 143 | return_serial(serial); |
| 144 | |
| 145 | for (i = 0; i < serial->num_ports; ++i) |
| 146 | serial->port[i]->port.count = 0; |
| 147 | |
| 148 | /* the ports are cleaned up and released in port_release() */ |
| 149 | for (i = 0; i < serial->num_ports; ++i) |
| 150 | if (serial->port[i]->dev.parent != NULL) { |
| 151 | device_unregister(&serial->port[i]->dev); |
| 152 | serial->port[i] = NULL; |
| 153 | } |
| 154 | |
| 155 | /* If this is a "fake" port, we have to clean it up here, as it will |
| 156 | * not get cleaned up in port_release() as it was never registered with |
| 157 | * the driver core */ |
| 158 | if (serial->num_ports < serial->num_port_pointers) { |
| 159 | for (i = serial->num_ports; |
| 160 | i < serial->num_port_pointers; ++i) { |
| 161 | port = serial->port[i]; |
| 162 | if (!port) |
| 163 | continue; |
| 164 | port_free(port); |
| 165 | } |
| 166 | } |
| 167 | |
| 168 | usb_put_dev(serial->dev); |
| 169 | |
| 170 | /* free up any memory that we allocated */ |
| 171 | kfree(serial); |
| 172 | } |
| 173 | |
| 174 | void usb_serial_put(struct usb_serial *serial) |
| 175 | { |
| 176 | mutex_lock(&table_lock); |
| 177 | kref_put(&serial->kref, destroy_serial); |
| 178 | mutex_unlock(&table_lock); |
| 179 | } |
| 180 | |
| 181 | /***************************************************************************** |
| 182 | * Driver tty interface functions |
| 183 | *****************************************************************************/ |
| 184 | static int serial_open (struct tty_struct *tty, struct file *filp) |
| 185 | { |
| 186 | struct usb_serial *serial; |
| 187 | struct usb_serial_port *port; |
| 188 | unsigned int portNumber; |
| 189 | int retval; |
| 190 | |
| 191 | dbg("%s", __func__); |
| 192 | |
| 193 | /* get the serial object associated with this tty pointer */ |
| 194 | serial = usb_serial_get_by_index(tty->index); |
| 195 | if (!serial) { |
| 196 | tty->driver_data = NULL; |
| 197 | return -ENODEV; |
| 198 | } |
| 199 | |
| 200 | portNumber = tty->index - serial->minor; |
| 201 | port = serial->port[portNumber]; |
| 202 | if (!port) { |
| 203 | retval = -ENODEV; |
| 204 | goto bailout_kref_put; |
| 205 | } |
| 206 | |
| 207 | if (mutex_lock_interruptible(&port->mutex)) { |
| 208 | retval = -ERESTARTSYS; |
| 209 | goto bailout_kref_put; |
| 210 | } |
| 211 | |
| 212 | ++port->port.count; |
| 213 | |
| 214 | /* set up our port structure making the tty driver |
| 215 | * remember our port object, and us it */ |
| 216 | tty->driver_data = port; |
| 217 | tty_port_tty_set(&port->port, tty); |
| 218 | |
| 219 | if (port->port.count == 1) { |
| 220 | |
| 221 | /* lock this module before we call it |
| 222 | * this may fail, which means we must bail out, |
| 223 | * safe because we are called with BKL held */ |
| 224 | if (!try_module_get(serial->type->driver.owner)) { |
| 225 | retval = -ENODEV; |
| 226 | goto bailout_mutex_unlock; |
| 227 | } |
| 228 | |
| 229 | retval = usb_autopm_get_interface(serial->interface); |
| 230 | if (retval) |
| 231 | goto bailout_module_put; |
| 232 | /* only call the device specific open if this |
| 233 | * is the first time the port is opened */ |
| 234 | retval = serial->type->open(tty, port, filp); |
| 235 | if (retval) |
| 236 | goto bailout_interface_put; |
| 237 | } |
| 238 | |
| 239 | mutex_unlock(&port->mutex); |
| 240 | return 0; |
| 241 | |
| 242 | bailout_interface_put: |
| 243 | usb_autopm_put_interface(serial->interface); |
| 244 | bailout_module_put: |
| 245 | module_put(serial->type->driver.owner); |
| 246 | bailout_mutex_unlock: |
| 247 | port->port.count = 0; |
| 248 | tty->driver_data = NULL; |
| 249 | tty_port_tty_set(&port->port, NULL); |
| 250 | mutex_unlock(&port->mutex); |
| 251 | bailout_kref_put: |
| 252 | usb_serial_put(serial); |
| 253 | return retval; |
| 254 | } |
| 255 | |
| 256 | static void serial_close(struct tty_struct *tty, struct file *filp) |
| 257 | { |
| 258 | struct usb_serial_port *port = tty->driver_data; |
| 259 | |
| 260 | if (!port) |
| 261 | return; |
| 262 | |
| 263 | dbg("%s - port %d", __func__, port->number); |
| 264 | |
| 265 | mutex_lock(&port->mutex); |
| 266 | |
| 267 | if (port->port.count == 0) { |
| 268 | mutex_unlock(&port->mutex); |
| 269 | return; |
| 270 | } |
| 271 | |
| 272 | --port->port.count; |
| 273 | if (port->port.count == 0) |
| 274 | /* only call the device specific close if this |
| 275 | * port is being closed by the last owner */ |
| 276 | port->serial->type->close(tty, port, filp); |
| 277 | |
| 278 | if (port->port.count == (port->console? 1 : 0)) { |
| 279 | struct tty_struct *tty = tty_port_tty_get(&port->port); |
| 280 | if (tty) { |
| 281 | if (tty->driver_data) |
| 282 | tty->driver_data = NULL; |
| 283 | tty_port_tty_set(&port->port, NULL); |
| 284 | } |
| 285 | } |
| 286 | |
| 287 | if (port->port.count == 0) { |
| 288 | mutex_lock(&port->serial->disc_mutex); |
| 289 | if (!port->serial->disconnected) |
| 290 | usb_autopm_put_interface(port->serial->interface); |
| 291 | mutex_unlock(&port->serial->disc_mutex); |
| 292 | module_put(port->serial->type->driver.owner); |
| 293 | } |
| 294 | |
| 295 | mutex_unlock(&port->mutex); |
| 296 | usb_serial_put(port->serial); |
| 297 | } |
| 298 | |
| 299 | static int serial_write(struct tty_struct *tty, const unsigned char *buf, |
| 300 | int count) |
| 301 | { |
| 302 | struct usb_serial_port *port = tty->driver_data; |
| 303 | int retval = -ENODEV; |
| 304 | |
| 305 | if (port->serial->dev->state == USB_STATE_NOTATTACHED) |
| 306 | goto exit; |
| 307 | |
| 308 | dbg("%s - port %d, %d byte(s)", __func__, port->number, count); |
| 309 | |
| 310 | /* count is managed under the mutex lock for the tty so cannot |
| 311 | drop to zero until after the last close completes */ |
| 312 | WARN_ON(!port->port.count); |
| 313 | |
| 314 | /* pass on to the driver specific version of this function */ |
| 315 | retval = port->serial->type->write(tty, port, buf, count); |
| 316 | |
| 317 | exit: |
| 318 | return retval; |
| 319 | } |
| 320 | |
| 321 | static int serial_write_room(struct tty_struct *tty) |
| 322 | { |
| 323 | struct usb_serial_port *port = tty->driver_data; |
| 324 | dbg("%s - port %d", __func__, port->number); |
| 325 | WARN_ON(!port->port.count); |
| 326 | /* pass on to the driver specific version of this function */ |
| 327 | return port->serial->type->write_room(tty); |
| 328 | } |
| 329 | |
| 330 | static int serial_chars_in_buffer(struct tty_struct *tty) |
| 331 | { |
| 332 | struct usb_serial_port *port = tty->driver_data; |
| 333 | dbg("%s = port %d", __func__, port->number); |
| 334 | |
| 335 | WARN_ON(!port->port.count); |
| 336 | /* pass on to the driver specific version of this function */ |
| 337 | return port->serial->type->chars_in_buffer(tty); |
| 338 | } |
| 339 | |
| 340 | static void serial_throttle(struct tty_struct *tty) |
| 341 | { |
| 342 | struct usb_serial_port *port = tty->driver_data; |
| 343 | dbg("%s - port %d", __func__, port->number); |
| 344 | |
| 345 | WARN_ON(!port->port.count); |
| 346 | /* pass on to the driver specific version of this function */ |
| 347 | if (port->serial->type->throttle) |
| 348 | port->serial->type->throttle(tty); |
| 349 | } |
| 350 | |
| 351 | static void serial_unthrottle(struct tty_struct *tty) |
| 352 | { |
| 353 | struct usb_serial_port *port = tty->driver_data; |
| 354 | dbg("%s - port %d", __func__, port->number); |
| 355 | |
| 356 | WARN_ON(!port->port.count); |
| 357 | /* pass on to the driver specific version of this function */ |
| 358 | if (port->serial->type->unthrottle) |
| 359 | port->serial->type->unthrottle(tty); |
| 360 | } |
| 361 | |
| 362 | static int serial_ioctl(struct tty_struct *tty, struct file *file, |
| 363 | unsigned int cmd, unsigned long arg) |
| 364 | { |
| 365 | struct usb_serial_port *port = tty->driver_data; |
| 366 | int retval = -ENODEV; |
| 367 | |
| 368 | dbg("%s - port %d, cmd 0x%.4x", __func__, port->number, cmd); |
| 369 | |
| 370 | WARN_ON(!port->port.count); |
| 371 | |
| 372 | /* pass on to the driver specific version of this function |
| 373 | if it is available */ |
| 374 | if (port->serial->type->ioctl) { |
| 375 | lock_kernel(); |
| 376 | retval = port->serial->type->ioctl(tty, file, cmd, arg); |
| 377 | unlock_kernel(); |
| 378 | } else |
| 379 | retval = -ENOIOCTLCMD; |
| 380 | return retval; |
| 381 | } |
| 382 | |
| 383 | static void serial_set_termios(struct tty_struct *tty, struct ktermios *old) |
| 384 | { |
| 385 | struct usb_serial_port *port = tty->driver_data; |
| 386 | dbg("%s - port %d", __func__, port->number); |
| 387 | |
| 388 | WARN_ON(!port->port.count); |
| 389 | /* pass on to the driver specific version of this function |
| 390 | if it is available */ |
| 391 | if (port->serial->type->set_termios) |
| 392 | port->serial->type->set_termios(tty, port, old); |
| 393 | else |
| 394 | tty_termios_copy_hw(tty->termios, old); |
| 395 | } |
| 396 | |
| 397 | static int serial_break(struct tty_struct *tty, int break_state) |
| 398 | { |
| 399 | struct usb_serial_port *port = tty->driver_data; |
| 400 | |
| 401 | dbg("%s - port %d", __func__, port->number); |
| 402 | |
| 403 | WARN_ON(!port->port.count); |
| 404 | /* pass on to the driver specific version of this function |
| 405 | if it is available */ |
| 406 | if (port->serial->type->break_ctl) { |
| 407 | lock_kernel(); |
| 408 | port->serial->type->break_ctl(tty, break_state); |
| 409 | unlock_kernel(); |
| 410 | } |
| 411 | return 0; |
| 412 | } |
| 413 | |
| 414 | static int serial_read_proc(char *page, char **start, off_t off, int count, |
| 415 | int *eof, void *data) |
| 416 | { |
| 417 | struct usb_serial *serial; |
| 418 | int length = 0; |
| 419 | int i; |
| 420 | off_t begin = 0; |
| 421 | char tmp[40]; |
| 422 | |
| 423 | dbg("%s", __func__); |
| 424 | length += sprintf(page, "usbserinfo:1.0 driver:2.0\n"); |
| 425 | for (i = 0; i < SERIAL_TTY_MINORS && length < PAGE_SIZE; ++i) { |
| 426 | serial = usb_serial_get_by_index(i); |
| 427 | if (serial == NULL) |
| 428 | continue; |
| 429 | |
| 430 | length += sprintf(page+length, "%d:", i); |
| 431 | if (serial->type->driver.owner) |
| 432 | length += sprintf(page+length, " module:%s", |
| 433 | module_name(serial->type->driver.owner)); |
| 434 | length += sprintf(page+length, " name:\"%s\"", |
| 435 | serial->type->description); |
| 436 | length += sprintf(page+length, " vendor:%04x product:%04x", |
| 437 | le16_to_cpu(serial->dev->descriptor.idVendor), |
| 438 | le16_to_cpu(serial->dev->descriptor.idProduct)); |
| 439 | length += sprintf(page+length, " num_ports:%d", |
| 440 | serial->num_ports); |
| 441 | length += sprintf(page+length, " port:%d", |
| 442 | i - serial->minor + 1); |
| 443 | usb_make_path(serial->dev, tmp, sizeof(tmp)); |
| 444 | length += sprintf(page+length, " path:%s", tmp); |
| 445 | |
| 446 | length += sprintf(page+length, "\n"); |
| 447 | if ((length + begin) > (off + count)) { |
| 448 | usb_serial_put(serial); |
| 449 | goto done; |
| 450 | } |
| 451 | if ((length + begin) < off) { |
| 452 | begin += length; |
| 453 | length = 0; |
| 454 | } |
| 455 | usb_serial_put(serial); |
| 456 | } |
| 457 | *eof = 1; |
| 458 | done: |
| 459 | if (off >= (length + begin)) |
| 460 | return 0; |
| 461 | *start = page + (off-begin); |
| 462 | return (count < begin+length-off) ? count : begin+length-off; |
| 463 | } |
| 464 | |
| 465 | static int serial_tiocmget(struct tty_struct *tty, struct file *file) |
| 466 | { |
| 467 | struct usb_serial_port *port = tty->driver_data; |
| 468 | |
| 469 | dbg("%s - port %d", __func__, port->number); |
| 470 | |
| 471 | WARN_ON(!port->port.count); |
| 472 | if (port->serial->type->tiocmget) |
| 473 | return port->serial->type->tiocmget(tty, file); |
| 474 | return -EINVAL; |
| 475 | } |
| 476 | |
| 477 | static int serial_tiocmset(struct tty_struct *tty, struct file *file, |
| 478 | unsigned int set, unsigned int clear) |
| 479 | { |
| 480 | struct usb_serial_port *port = tty->driver_data; |
| 481 | |
| 482 | dbg("%s - port %d", __func__, port->number); |
| 483 | |
| 484 | WARN_ON(!port->port.count); |
| 485 | if (port->serial->type->tiocmset) |
| 486 | return port->serial->type->tiocmset(tty, file, set, clear); |
| 487 | return -EINVAL; |
| 488 | } |
| 489 | |
| 490 | /* |
| 491 | * We would be calling tty_wakeup here, but unfortunately some line |
| 492 | * disciplines have an annoying habit of calling tty->write from |
| 493 | * the write wakeup callback (e.g. n_hdlc.c). |
| 494 | */ |
| 495 | void usb_serial_port_softint(struct usb_serial_port *port) |
| 496 | { |
| 497 | schedule_work(&port->work); |
| 498 | } |
| 499 | EXPORT_SYMBOL_GPL(usb_serial_port_softint); |
| 500 | |
| 501 | static void usb_serial_port_work(struct work_struct *work) |
| 502 | { |
| 503 | struct usb_serial_port *port = |
| 504 | container_of(work, struct usb_serial_port, work); |
| 505 | struct tty_struct *tty; |
| 506 | |
| 507 | dbg("%s - port %d", __func__, port->number); |
| 508 | |
| 509 | if (!port) |
| 510 | return; |
| 511 | |
| 512 | tty = tty_port_tty_get(&port->port); |
| 513 | if (!tty) |
| 514 | return; |
| 515 | |
| 516 | tty_wakeup(tty); |
| 517 | tty_kref_put(tty); |
| 518 | } |
| 519 | |
| 520 | static void port_release(struct device *dev) |
| 521 | { |
| 522 | struct usb_serial_port *port = to_usb_serial_port(dev); |
| 523 | |
| 524 | dbg ("%s - %s", __func__, dev_name(dev)); |
| 525 | port_free(port); |
| 526 | } |
| 527 | |
| 528 | static void kill_traffic(struct usb_serial_port *port) |
| 529 | { |
| 530 | usb_kill_urb(port->read_urb); |
| 531 | usb_kill_urb(port->write_urb); |
| 532 | /* |
| 533 | * This is tricky. |
| 534 | * Some drivers submit the read_urb in the |
| 535 | * handler for the write_urb or vice versa |
| 536 | * this order determines the order in which |
| 537 | * usb_kill_urb() must be used to reliably |
| 538 | * kill the URBs. As it is unknown here, |
| 539 | * both orders must be used in turn. |
| 540 | * The call below is not redundant. |
| 541 | */ |
| 542 | usb_kill_urb(port->read_urb); |
| 543 | usb_kill_urb(port->interrupt_in_urb); |
| 544 | usb_kill_urb(port->interrupt_out_urb); |
| 545 | } |
| 546 | |
| 547 | static void port_free(struct usb_serial_port *port) |
| 548 | { |
| 549 | kill_traffic(port); |
| 550 | usb_free_urb(port->read_urb); |
| 551 | usb_free_urb(port->write_urb); |
| 552 | usb_free_urb(port->interrupt_in_urb); |
| 553 | usb_free_urb(port->interrupt_out_urb); |
| 554 | kfree(port->bulk_in_buffer); |
| 555 | kfree(port->bulk_out_buffer); |
| 556 | kfree(port->interrupt_in_buffer); |
| 557 | kfree(port->interrupt_out_buffer); |
| 558 | flush_scheduled_work(); /* port->work */ |
| 559 | kfree(port); |
| 560 | } |
| 561 | |
| 562 | static struct usb_serial *create_serial(struct usb_device *dev, |
| 563 | struct usb_interface *interface, |
| 564 | struct usb_serial_driver *driver) |
| 565 | { |
| 566 | struct usb_serial *serial; |
| 567 | |
| 568 | serial = kzalloc(sizeof(*serial), GFP_KERNEL); |
| 569 | if (!serial) { |
| 570 | dev_err(&dev->dev, "%s - out of memory\n", __func__); |
| 571 | return NULL; |
| 572 | } |
| 573 | serial->dev = usb_get_dev(dev); |
| 574 | serial->type = driver; |
| 575 | serial->interface = interface; |
| 576 | kref_init(&serial->kref); |
| 577 | mutex_init(&serial->disc_mutex); |
| 578 | serial->minor = SERIAL_TTY_NO_MINOR; |
| 579 | |
| 580 | return serial; |
| 581 | } |
| 582 | |
| 583 | static const struct usb_device_id *match_dynamic_id(struct usb_interface *intf, |
| 584 | struct usb_serial_driver *drv) |
| 585 | { |
| 586 | struct usb_dynid *dynid; |
| 587 | |
| 588 | spin_lock(&drv->dynids.lock); |
| 589 | list_for_each_entry(dynid, &drv->dynids.list, node) { |
| 590 | if (usb_match_one_id(intf, &dynid->id)) { |
| 591 | spin_unlock(&drv->dynids.lock); |
| 592 | return &dynid->id; |
| 593 | } |
| 594 | } |
| 595 | spin_unlock(&drv->dynids.lock); |
| 596 | return NULL; |
| 597 | } |
| 598 | |
| 599 | static const struct usb_device_id *get_iface_id(struct usb_serial_driver *drv, |
| 600 | struct usb_interface *intf) |
| 601 | { |
| 602 | const struct usb_device_id *id; |
| 603 | |
| 604 | id = usb_match_id(intf, drv->id_table); |
| 605 | if (id) { |
| 606 | dbg("static descriptor matches"); |
| 607 | goto exit; |
| 608 | } |
| 609 | id = match_dynamic_id(intf, drv); |
| 610 | if (id) |
| 611 | dbg("dynamic descriptor matches"); |
| 612 | exit: |
| 613 | return id; |
| 614 | } |
| 615 | |
| 616 | static struct usb_serial_driver *search_serial_device( |
| 617 | struct usb_interface *iface) |
| 618 | { |
| 619 | const struct usb_device_id *id; |
| 620 | struct usb_serial_driver *drv; |
| 621 | |
| 622 | /* Check if the usb id matches a known device */ |
| 623 | list_for_each_entry(drv, &usb_serial_driver_list, driver_list) { |
| 624 | id = get_iface_id(drv, iface); |
| 625 | if (id) |
| 626 | return drv; |
| 627 | } |
| 628 | |
| 629 | return NULL; |
| 630 | } |
| 631 | |
| 632 | int usb_serial_probe(struct usb_interface *interface, |
| 633 | const struct usb_device_id *id) |
| 634 | { |
| 635 | struct usb_device *dev = interface_to_usbdev(interface); |
| 636 | struct usb_serial *serial = NULL; |
| 637 | struct usb_serial_port *port; |
| 638 | struct usb_host_interface *iface_desc; |
| 639 | struct usb_endpoint_descriptor *endpoint; |
| 640 | struct usb_endpoint_descriptor *interrupt_in_endpoint[MAX_NUM_PORTS]; |
| 641 | struct usb_endpoint_descriptor *interrupt_out_endpoint[MAX_NUM_PORTS]; |
| 642 | struct usb_endpoint_descriptor *bulk_in_endpoint[MAX_NUM_PORTS]; |
| 643 | struct usb_endpoint_descriptor *bulk_out_endpoint[MAX_NUM_PORTS]; |
| 644 | struct usb_serial_driver *type = NULL; |
| 645 | int retval; |
| 646 | unsigned int minor; |
| 647 | int buffer_size; |
| 648 | int i; |
| 649 | int num_interrupt_in = 0; |
| 650 | int num_interrupt_out = 0; |
| 651 | int num_bulk_in = 0; |
| 652 | int num_bulk_out = 0; |
| 653 | int num_ports = 0; |
| 654 | int max_endpoints; |
| 655 | |
| 656 | lock_kernel(); /* guard against unloading a serial driver module */ |
| 657 | type = search_serial_device(interface); |
| 658 | if (!type) { |
| 659 | unlock_kernel(); |
| 660 | dbg("none matched"); |
| 661 | return -ENODEV; |
| 662 | } |
| 663 | |
| 664 | serial = create_serial(dev, interface, type); |
| 665 | if (!serial) { |
| 666 | unlock_kernel(); |
| 667 | dev_err(&interface->dev, "%s - out of memory\n", __func__); |
| 668 | return -ENOMEM; |
| 669 | } |
| 670 | |
| 671 | /* if this device type has a probe function, call it */ |
| 672 | if (type->probe) { |
| 673 | const struct usb_device_id *id; |
| 674 | |
| 675 | if (!try_module_get(type->driver.owner)) { |
| 676 | unlock_kernel(); |
| 677 | dev_err(&interface->dev, |
| 678 | "module get failed, exiting\n"); |
| 679 | kfree(serial); |
| 680 | return -EIO; |
| 681 | } |
| 682 | |
| 683 | id = get_iface_id(type, interface); |
| 684 | retval = type->probe(serial, id); |
| 685 | module_put(type->driver.owner); |
| 686 | |
| 687 | if (retval) { |
| 688 | unlock_kernel(); |
| 689 | dbg("sub driver rejected device"); |
| 690 | kfree(serial); |
| 691 | return retval; |
| 692 | } |
| 693 | } |
| 694 | |
| 695 | /* descriptor matches, let's find the endpoints needed */ |
| 696 | /* check out the endpoints */ |
| 697 | iface_desc = interface->cur_altsetting; |
| 698 | for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { |
| 699 | endpoint = &iface_desc->endpoint[i].desc; |
| 700 | |
| 701 | if (usb_endpoint_is_bulk_in(endpoint)) { |
| 702 | /* we found a bulk in endpoint */ |
| 703 | dbg("found bulk in on endpoint %d", i); |
| 704 | bulk_in_endpoint[num_bulk_in] = endpoint; |
| 705 | ++num_bulk_in; |
| 706 | } |
| 707 | |
| 708 | if (usb_endpoint_is_bulk_out(endpoint)) { |
| 709 | /* we found a bulk out endpoint */ |
| 710 | dbg("found bulk out on endpoint %d", i); |
| 711 | bulk_out_endpoint[num_bulk_out] = endpoint; |
| 712 | ++num_bulk_out; |
| 713 | } |
| 714 | |
| 715 | if (usb_endpoint_is_int_in(endpoint)) { |
| 716 | /* we found a interrupt in endpoint */ |
| 717 | dbg("found interrupt in on endpoint %d", i); |
| 718 | interrupt_in_endpoint[num_interrupt_in] = endpoint; |
| 719 | ++num_interrupt_in; |
| 720 | } |
| 721 | |
| 722 | if (usb_endpoint_is_int_out(endpoint)) { |
| 723 | /* we found an interrupt out endpoint */ |
| 724 | dbg("found interrupt out on endpoint %d", i); |
| 725 | interrupt_out_endpoint[num_interrupt_out] = endpoint; |
| 726 | ++num_interrupt_out; |
| 727 | } |
| 728 | } |
| 729 | |
| 730 | #if defined(CONFIG_USB_SERIAL_PL2303) || defined(CONFIG_USB_SERIAL_PL2303_MODULE) |
| 731 | /* BEGIN HORRIBLE HACK FOR PL2303 */ |
| 732 | /* this is needed due to the looney way its endpoints are set up */ |
| 733 | if (((le16_to_cpu(dev->descriptor.idVendor) == PL2303_VENDOR_ID) && |
| 734 | (le16_to_cpu(dev->descriptor.idProduct) == PL2303_PRODUCT_ID)) || |
| 735 | ((le16_to_cpu(dev->descriptor.idVendor) == ATEN_VENDOR_ID) && |
| 736 | (le16_to_cpu(dev->descriptor.idProduct) == ATEN_PRODUCT_ID)) || |
| 737 | ((le16_to_cpu(dev->descriptor.idVendor) == ALCOR_VENDOR_ID) && |
| 738 | (le16_to_cpu(dev->descriptor.idProduct) == ALCOR_PRODUCT_ID)) || |
| 739 | ((le16_to_cpu(dev->descriptor.idVendor) == SIEMENS_VENDOR_ID) && |
| 740 | (le16_to_cpu(dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_EF81))) { |
| 741 | if (interface != dev->actconfig->interface[0]) { |
| 742 | /* check out the endpoints of the other interface*/ |
| 743 | iface_desc = dev->actconfig->interface[0]->cur_altsetting; |
| 744 | for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { |
| 745 | endpoint = &iface_desc->endpoint[i].desc; |
| 746 | if (usb_endpoint_is_int_in(endpoint)) { |
| 747 | /* we found a interrupt in endpoint */ |
| 748 | dbg("found interrupt in for Prolific device on separate interface"); |
| 749 | interrupt_in_endpoint[num_interrupt_in] = endpoint; |
| 750 | ++num_interrupt_in; |
| 751 | } |
| 752 | } |
| 753 | } |
| 754 | |
| 755 | /* Now make sure the PL-2303 is configured correctly. |
| 756 | * If not, give up now and hope this hack will work |
| 757 | * properly during a later invocation of usb_serial_probe |
| 758 | */ |
| 759 | if (num_bulk_in == 0 || num_bulk_out == 0) { |
| 760 | unlock_kernel(); |
| 761 | dev_info(&interface->dev, "PL-2303 hack: descriptors matched but endpoints did not\n"); |
| 762 | kfree(serial); |
| 763 | return -ENODEV; |
| 764 | } |
| 765 | } |
| 766 | /* END HORRIBLE HACK FOR PL2303 */ |
| 767 | #endif |
| 768 | |
| 769 | #ifdef CONFIG_USB_SERIAL_GENERIC |
| 770 | if (type == &usb_serial_generic_device) { |
| 771 | num_ports = num_bulk_out; |
| 772 | if (num_ports == 0) { |
| 773 | unlock_kernel(); |
| 774 | dev_err(&interface->dev, |
| 775 | "Generic device with no bulk out, not allowed.\n"); |
| 776 | kfree(serial); |
| 777 | return -EIO; |
| 778 | } |
| 779 | } |
| 780 | #endif |
| 781 | if (!num_ports) { |
| 782 | /* if this device type has a calc_num_ports function, call it */ |
| 783 | if (type->calc_num_ports) { |
| 784 | if (!try_module_get(type->driver.owner)) { |
| 785 | unlock_kernel(); |
| 786 | dev_err(&interface->dev, |
| 787 | "module get failed, exiting\n"); |
| 788 | kfree(serial); |
| 789 | return -EIO; |
| 790 | } |
| 791 | num_ports = type->calc_num_ports(serial); |
| 792 | module_put(type->driver.owner); |
| 793 | } |
| 794 | if (!num_ports) |
| 795 | num_ports = type->num_ports; |
| 796 | } |
| 797 | |
| 798 | serial->num_ports = num_ports; |
| 799 | serial->num_bulk_in = num_bulk_in; |
| 800 | serial->num_bulk_out = num_bulk_out; |
| 801 | serial->num_interrupt_in = num_interrupt_in; |
| 802 | serial->num_interrupt_out = num_interrupt_out; |
| 803 | |
| 804 | /* found all that we need */ |
| 805 | dev_info(&interface->dev, "%s converter detected\n", |
| 806 | type->description); |
| 807 | |
| 808 | /* create our ports, we need as many as the max endpoints */ |
| 809 | /* we don't use num_ports here because some devices have more |
| 810 | endpoint pairs than ports */ |
| 811 | max_endpoints = max(num_bulk_in, num_bulk_out); |
| 812 | max_endpoints = max(max_endpoints, num_interrupt_in); |
| 813 | max_endpoints = max(max_endpoints, num_interrupt_out); |
| 814 | max_endpoints = max(max_endpoints, (int)serial->num_ports); |
| 815 | serial->num_port_pointers = max_endpoints; |
| 816 | unlock_kernel(); |
| 817 | |
| 818 | dbg("%s - setting up %d port structures for this device", |
| 819 | __func__, max_endpoints); |
| 820 | for (i = 0; i < max_endpoints; ++i) { |
| 821 | port = kzalloc(sizeof(struct usb_serial_port), GFP_KERNEL); |
| 822 | if (!port) |
| 823 | goto probe_error; |
| 824 | tty_port_init(&port->port); |
| 825 | port->serial = serial; |
| 826 | spin_lock_init(&port->lock); |
| 827 | mutex_init(&port->mutex); |
| 828 | INIT_WORK(&port->work, usb_serial_port_work); |
| 829 | serial->port[i] = port; |
| 830 | } |
| 831 | |
| 832 | /* set up the endpoint information */ |
| 833 | for (i = 0; i < num_bulk_in; ++i) { |
| 834 | endpoint = bulk_in_endpoint[i]; |
| 835 | port = serial->port[i]; |
| 836 | port->read_urb = usb_alloc_urb(0, GFP_KERNEL); |
| 837 | if (!port->read_urb) { |
| 838 | dev_err(&interface->dev, "No free urbs available\n"); |
| 839 | goto probe_error; |
| 840 | } |
| 841 | buffer_size = le16_to_cpu(endpoint->wMaxPacketSize); |
| 842 | port->bulk_in_size = buffer_size; |
| 843 | port->bulk_in_endpointAddress = endpoint->bEndpointAddress; |
| 844 | port->bulk_in_buffer = kmalloc(buffer_size, GFP_KERNEL); |
| 845 | if (!port->bulk_in_buffer) { |
| 846 | dev_err(&interface->dev, |
| 847 | "Couldn't allocate bulk_in_buffer\n"); |
| 848 | goto probe_error; |
| 849 | } |
| 850 | usb_fill_bulk_urb(port->read_urb, dev, |
| 851 | usb_rcvbulkpipe(dev, |
| 852 | endpoint->bEndpointAddress), |
| 853 | port->bulk_in_buffer, buffer_size, |
| 854 | serial->type->read_bulk_callback, port); |
| 855 | } |
| 856 | |
| 857 | for (i = 0; i < num_bulk_out; ++i) { |
| 858 | endpoint = bulk_out_endpoint[i]; |
| 859 | port = serial->port[i]; |
| 860 | port->write_urb = usb_alloc_urb(0, GFP_KERNEL); |
| 861 | if (!port->write_urb) { |
| 862 | dev_err(&interface->dev, "No free urbs available\n"); |
| 863 | goto probe_error; |
| 864 | } |
| 865 | buffer_size = le16_to_cpu(endpoint->wMaxPacketSize); |
| 866 | port->bulk_out_size = buffer_size; |
| 867 | port->bulk_out_endpointAddress = endpoint->bEndpointAddress; |
| 868 | port->bulk_out_buffer = kmalloc(buffer_size, GFP_KERNEL); |
| 869 | if (!port->bulk_out_buffer) { |
| 870 | dev_err(&interface->dev, |
| 871 | "Couldn't allocate bulk_out_buffer\n"); |
| 872 | goto probe_error; |
| 873 | } |
| 874 | usb_fill_bulk_urb(port->write_urb, dev, |
| 875 | usb_sndbulkpipe(dev, |
| 876 | endpoint->bEndpointAddress), |
| 877 | port->bulk_out_buffer, buffer_size, |
| 878 | serial->type->write_bulk_callback, port); |
| 879 | } |
| 880 | |
| 881 | if (serial->type->read_int_callback) { |
| 882 | for (i = 0; i < num_interrupt_in; ++i) { |
| 883 | endpoint = interrupt_in_endpoint[i]; |
| 884 | port = serial->port[i]; |
| 885 | port->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL); |
| 886 | if (!port->interrupt_in_urb) { |
| 887 | dev_err(&interface->dev, |
| 888 | "No free urbs available\n"); |
| 889 | goto probe_error; |
| 890 | } |
| 891 | buffer_size = le16_to_cpu(endpoint->wMaxPacketSize); |
| 892 | port->interrupt_in_endpointAddress = |
| 893 | endpoint->bEndpointAddress; |
| 894 | port->interrupt_in_buffer = kmalloc(buffer_size, |
| 895 | GFP_KERNEL); |
| 896 | if (!port->interrupt_in_buffer) { |
| 897 | dev_err(&interface->dev, |
| 898 | "Couldn't allocate interrupt_in_buffer\n"); |
| 899 | goto probe_error; |
| 900 | } |
| 901 | usb_fill_int_urb(port->interrupt_in_urb, dev, |
| 902 | usb_rcvintpipe(dev, |
| 903 | endpoint->bEndpointAddress), |
| 904 | port->interrupt_in_buffer, buffer_size, |
| 905 | serial->type->read_int_callback, port, |
| 906 | endpoint->bInterval); |
| 907 | } |
| 908 | } else if (num_interrupt_in) { |
| 909 | dbg("the device claims to support interrupt in transfers, but read_int_callback is not defined"); |
| 910 | } |
| 911 | |
| 912 | if (serial->type->write_int_callback) { |
| 913 | for (i = 0; i < num_interrupt_out; ++i) { |
| 914 | endpoint = interrupt_out_endpoint[i]; |
| 915 | port = serial->port[i]; |
| 916 | port->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL); |
| 917 | if (!port->interrupt_out_urb) { |
| 918 | dev_err(&interface->dev, |
| 919 | "No free urbs available\n"); |
| 920 | goto probe_error; |
| 921 | } |
| 922 | buffer_size = le16_to_cpu(endpoint->wMaxPacketSize); |
| 923 | port->interrupt_out_size = buffer_size; |
| 924 | port->interrupt_out_endpointAddress = |
| 925 | endpoint->bEndpointAddress; |
| 926 | port->interrupt_out_buffer = kmalloc(buffer_size, |
| 927 | GFP_KERNEL); |
| 928 | if (!port->interrupt_out_buffer) { |
| 929 | dev_err(&interface->dev, |
| 930 | "Couldn't allocate interrupt_out_buffer\n"); |
| 931 | goto probe_error; |
| 932 | } |
| 933 | usb_fill_int_urb(port->interrupt_out_urb, dev, |
| 934 | usb_sndintpipe(dev, |
| 935 | endpoint->bEndpointAddress), |
| 936 | port->interrupt_out_buffer, buffer_size, |
| 937 | serial->type->write_int_callback, port, |
| 938 | endpoint->bInterval); |
| 939 | } |
| 940 | } else if (num_interrupt_out) { |
| 941 | dbg("the device claims to support interrupt out transfers, but write_int_callback is not defined"); |
| 942 | } |
| 943 | |
| 944 | /* if this device type has an attach function, call it */ |
| 945 | if (type->attach) { |
| 946 | if (!try_module_get(type->driver.owner)) { |
| 947 | dev_err(&interface->dev, |
| 948 | "module get failed, exiting\n"); |
| 949 | goto probe_error; |
| 950 | } |
| 951 | retval = type->attach(serial); |
| 952 | module_put(type->driver.owner); |
| 953 | if (retval < 0) |
| 954 | goto probe_error; |
| 955 | if (retval > 0) { |
| 956 | /* quietly accept this device, but don't bind to a |
| 957 | serial port as it's about to disappear */ |
| 958 | goto exit; |
| 959 | } |
| 960 | } |
| 961 | |
| 962 | if (get_free_serial(serial, num_ports, &minor) == NULL) { |
| 963 | dev_err(&interface->dev, "No more free serial devices\n"); |
| 964 | goto probe_error; |
| 965 | } |
| 966 | serial->minor = minor; |
| 967 | |
| 968 | /* register all of the individual ports with the driver core */ |
| 969 | for (i = 0; i < num_ports; ++i) { |
| 970 | port = serial->port[i]; |
| 971 | port->dev.parent = &interface->dev; |
| 972 | port->dev.driver = NULL; |
| 973 | port->dev.bus = &usb_serial_bus_type; |
| 974 | port->dev.release = &port_release; |
| 975 | |
| 976 | dev_set_name(&port->dev, "ttyUSB%d", port->number); |
| 977 | dbg ("%s - registering %s", __func__, dev_name(&port->dev)); |
| 978 | retval = device_register(&port->dev); |
| 979 | if (retval) |
| 980 | dev_err(&port->dev, "Error registering port device, " |
| 981 | "continuing\n"); |
| 982 | } |
| 983 | |
| 984 | usb_serial_console_init(debug, minor); |
| 985 | |
| 986 | exit: |
| 987 | /* success */ |
| 988 | usb_set_intfdata(interface, serial); |
| 989 | return 0; |
| 990 | |
| 991 | probe_error: |
| 992 | for (i = 0; i < num_bulk_in; ++i) { |
| 993 | port = serial->port[i]; |
| 994 | if (!port) |
| 995 | continue; |
| 996 | usb_free_urb(port->read_urb); |
| 997 | kfree(port->bulk_in_buffer); |
| 998 | } |
| 999 | for (i = 0; i < num_bulk_out; ++i) { |
| 1000 | port = serial->port[i]; |
| 1001 | if (!port) |
| 1002 | continue; |
| 1003 | usb_free_urb(port->write_urb); |
| 1004 | kfree(port->bulk_out_buffer); |
| 1005 | } |
| 1006 | for (i = 0; i < num_interrupt_in; ++i) { |
| 1007 | port = serial->port[i]; |
| 1008 | if (!port) |
| 1009 | continue; |
| 1010 | usb_free_urb(port->interrupt_in_urb); |
| 1011 | kfree(port->interrupt_in_buffer); |
| 1012 | } |
| 1013 | for (i = 0; i < num_interrupt_out; ++i) { |
| 1014 | port = serial->port[i]; |
| 1015 | if (!port) |
| 1016 | continue; |
| 1017 | usb_free_urb(port->interrupt_out_urb); |
| 1018 | kfree(port->interrupt_out_buffer); |
| 1019 | } |
| 1020 | |
| 1021 | /* free up any memory that we allocated */ |
| 1022 | for (i = 0; i < serial->num_port_pointers; ++i) |
| 1023 | kfree(serial->port[i]); |
| 1024 | kfree(serial); |
| 1025 | return -EIO; |
| 1026 | } |
| 1027 | EXPORT_SYMBOL_GPL(usb_serial_probe); |
| 1028 | |
| 1029 | void usb_serial_disconnect(struct usb_interface *interface) |
| 1030 | { |
| 1031 | int i; |
| 1032 | struct usb_serial *serial = usb_get_intfdata(interface); |
| 1033 | struct device *dev = &interface->dev; |
| 1034 | struct usb_serial_port *port; |
| 1035 | |
| 1036 | usb_serial_console_disconnect(serial); |
| 1037 | dbg("%s", __func__); |
| 1038 | |
| 1039 | mutex_lock(&serial->disc_mutex); |
| 1040 | usb_set_intfdata(interface, NULL); |
| 1041 | /* must set a flag, to signal subdrivers */ |
| 1042 | serial->disconnected = 1; |
| 1043 | for (i = 0; i < serial->num_ports; ++i) { |
| 1044 | port = serial->port[i]; |
| 1045 | if (port) { |
| 1046 | struct tty_struct *tty = tty_port_tty_get(&port->port); |
| 1047 | if (tty) { |
| 1048 | tty_hangup(tty); |
| 1049 | tty_kref_put(tty); |
| 1050 | } |
| 1051 | kill_traffic(port); |
| 1052 | } |
| 1053 | } |
| 1054 | /* let the last holder of this object |
| 1055 | * cause it to be cleaned up */ |
| 1056 | mutex_unlock(&serial->disc_mutex); |
| 1057 | usb_serial_put(serial); |
| 1058 | dev_info(dev, "device disconnected\n"); |
| 1059 | } |
| 1060 | EXPORT_SYMBOL_GPL(usb_serial_disconnect); |
| 1061 | |
| 1062 | int usb_serial_suspend(struct usb_interface *intf, pm_message_t message) |
| 1063 | { |
| 1064 | struct usb_serial *serial = usb_get_intfdata(intf); |
| 1065 | struct usb_serial_port *port; |
| 1066 | int i, r = 0; |
| 1067 | |
| 1068 | for (i = 0; i < serial->num_ports; ++i) { |
| 1069 | port = serial->port[i]; |
| 1070 | if (port) |
| 1071 | kill_traffic(port); |
| 1072 | } |
| 1073 | |
| 1074 | if (serial->type->suspend) |
| 1075 | r = serial->type->suspend(serial, message); |
| 1076 | |
| 1077 | return r; |
| 1078 | } |
| 1079 | EXPORT_SYMBOL(usb_serial_suspend); |
| 1080 | |
| 1081 | int usb_serial_resume(struct usb_interface *intf) |
| 1082 | { |
| 1083 | struct usb_serial *serial = usb_get_intfdata(intf); |
| 1084 | |
| 1085 | if (serial->type->resume) |
| 1086 | return serial->type->resume(serial); |
| 1087 | return 0; |
| 1088 | } |
| 1089 | EXPORT_SYMBOL(usb_serial_resume); |
| 1090 | |
| 1091 | static const struct tty_operations serial_ops = { |
| 1092 | .open = serial_open, |
| 1093 | .close = serial_close, |
| 1094 | .write = serial_write, |
| 1095 | .write_room = serial_write_room, |
| 1096 | .ioctl = serial_ioctl, |
| 1097 | .set_termios = serial_set_termios, |
| 1098 | .throttle = serial_throttle, |
| 1099 | .unthrottle = serial_unthrottle, |
| 1100 | .break_ctl = serial_break, |
| 1101 | .chars_in_buffer = serial_chars_in_buffer, |
| 1102 | .read_proc = serial_read_proc, |
| 1103 | .tiocmget = serial_tiocmget, |
| 1104 | .tiocmset = serial_tiocmset, |
| 1105 | }; |
| 1106 | |
| 1107 | struct tty_driver *usb_serial_tty_driver; |
| 1108 | |
| 1109 | static int __init usb_serial_init(void) |
| 1110 | { |
| 1111 | int i; |
| 1112 | int result; |
| 1113 | |
| 1114 | usb_serial_tty_driver = alloc_tty_driver(SERIAL_TTY_MINORS); |
| 1115 | if (!usb_serial_tty_driver) |
| 1116 | return -ENOMEM; |
| 1117 | |
| 1118 | /* Initialize our global data */ |
| 1119 | for (i = 0; i < SERIAL_TTY_MINORS; ++i) |
| 1120 | serial_table[i] = NULL; |
| 1121 | |
| 1122 | result = bus_register(&usb_serial_bus_type); |
| 1123 | if (result) { |
| 1124 | printk(KERN_ERR "usb-serial: %s - registering bus driver " |
| 1125 | "failed\n", __func__); |
| 1126 | goto exit_bus; |
| 1127 | } |
| 1128 | |
| 1129 | usb_serial_tty_driver->owner = THIS_MODULE; |
| 1130 | usb_serial_tty_driver->driver_name = "usbserial"; |
| 1131 | usb_serial_tty_driver->name = "ttyUSB"; |
| 1132 | usb_serial_tty_driver->major = SERIAL_TTY_MAJOR; |
| 1133 | usb_serial_tty_driver->minor_start = 0; |
| 1134 | usb_serial_tty_driver->type = TTY_DRIVER_TYPE_SERIAL; |
| 1135 | usb_serial_tty_driver->subtype = SERIAL_TYPE_NORMAL; |
| 1136 | usb_serial_tty_driver->flags = TTY_DRIVER_REAL_RAW | |
| 1137 | TTY_DRIVER_DYNAMIC_DEV; |
| 1138 | usb_serial_tty_driver->init_termios = tty_std_termios; |
| 1139 | usb_serial_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
| 1140 | | HUPCL | CLOCAL; |
| 1141 | usb_serial_tty_driver->init_termios.c_ispeed = 9600; |
| 1142 | usb_serial_tty_driver->init_termios.c_ospeed = 9600; |
| 1143 | tty_set_operations(usb_serial_tty_driver, &serial_ops); |
| 1144 | result = tty_register_driver(usb_serial_tty_driver); |
| 1145 | if (result) { |
| 1146 | printk(KERN_ERR "usb-serial: %s - tty_register_driver failed\n", |
| 1147 | __func__); |
| 1148 | goto exit_reg_driver; |
| 1149 | } |
| 1150 | |
| 1151 | /* register the USB driver */ |
| 1152 | result = usb_register(&usb_serial_driver); |
| 1153 | if (result < 0) { |
| 1154 | printk(KERN_ERR "usb-serial: %s - usb_register failed\n", |
| 1155 | __func__); |
| 1156 | goto exit_tty; |
| 1157 | } |
| 1158 | |
| 1159 | /* register the generic driver, if we should */ |
| 1160 | result = usb_serial_generic_register(debug); |
| 1161 | if (result < 0) { |
| 1162 | printk(KERN_ERR "usb-serial: %s - registering generic " |
| 1163 | "driver failed\n", __func__); |
| 1164 | goto exit_generic; |
| 1165 | } |
| 1166 | |
| 1167 | printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n"); |
| 1168 | |
| 1169 | return result; |
| 1170 | |
| 1171 | exit_generic: |
| 1172 | usb_deregister(&usb_serial_driver); |
| 1173 | |
| 1174 | exit_tty: |
| 1175 | tty_unregister_driver(usb_serial_tty_driver); |
| 1176 | |
| 1177 | exit_reg_driver: |
| 1178 | bus_unregister(&usb_serial_bus_type); |
| 1179 | |
| 1180 | exit_bus: |
| 1181 | printk(KERN_ERR "usb-serial: %s - returning with error %d\n", |
| 1182 | __func__, result); |
| 1183 | put_tty_driver(usb_serial_tty_driver); |
| 1184 | return result; |
| 1185 | } |
| 1186 | |
| 1187 | |
| 1188 | static void __exit usb_serial_exit(void) |
| 1189 | { |
| 1190 | usb_serial_console_exit(); |
| 1191 | |
| 1192 | usb_serial_generic_deregister(); |
| 1193 | |
| 1194 | usb_deregister(&usb_serial_driver); |
| 1195 | tty_unregister_driver(usb_serial_tty_driver); |
| 1196 | put_tty_driver(usb_serial_tty_driver); |
| 1197 | bus_unregister(&usb_serial_bus_type); |
| 1198 | } |
| 1199 | |
| 1200 | |
| 1201 | module_init(usb_serial_init); |
| 1202 | module_exit(usb_serial_exit); |
| 1203 | |
| 1204 | #define set_to_generic_if_null(type, function) \ |
| 1205 | do { \ |
| 1206 | if (!type->function) { \ |
| 1207 | type->function = usb_serial_generic_##function; \ |
| 1208 | dbg("Had to override the " #function \ |
| 1209 | " usb serial operation with the generic one.");\ |
| 1210 | } \ |
| 1211 | } while (0) |
| 1212 | |
| 1213 | static void fixup_generic(struct usb_serial_driver *device) |
| 1214 | { |
| 1215 | set_to_generic_if_null(device, open); |
| 1216 | set_to_generic_if_null(device, write); |
| 1217 | set_to_generic_if_null(device, close); |
| 1218 | set_to_generic_if_null(device, write_room); |
| 1219 | set_to_generic_if_null(device, chars_in_buffer); |
| 1220 | set_to_generic_if_null(device, read_bulk_callback); |
| 1221 | set_to_generic_if_null(device, write_bulk_callback); |
| 1222 | set_to_generic_if_null(device, shutdown); |
| 1223 | set_to_generic_if_null(device, resume); |
| 1224 | } |
| 1225 | |
| 1226 | int usb_serial_register(struct usb_serial_driver *driver) |
| 1227 | { |
| 1228 | /* must be called with BKL held */ |
| 1229 | int retval; |
| 1230 | |
| 1231 | fixup_generic(driver); |
| 1232 | |
| 1233 | if (!driver->description) |
| 1234 | driver->description = driver->driver.name; |
| 1235 | |
| 1236 | /* Add this device to our list of devices */ |
| 1237 | list_add(&driver->driver_list, &usb_serial_driver_list); |
| 1238 | |
| 1239 | retval = usb_serial_bus_register(driver); |
| 1240 | if (retval) { |
| 1241 | printk(KERN_ERR "usb-serial: problem %d when registering " |
| 1242 | "driver %s\n", retval, driver->description); |
| 1243 | list_del(&driver->driver_list); |
| 1244 | } else |
| 1245 | printk(KERN_INFO "USB Serial support registered for %s\n", |
| 1246 | driver->description); |
| 1247 | |
| 1248 | return retval; |
| 1249 | } |
| 1250 | EXPORT_SYMBOL_GPL(usb_serial_register); |
| 1251 | |
| 1252 | |
| 1253 | void usb_serial_deregister(struct usb_serial_driver *device) |
| 1254 | { |
| 1255 | /* must be called with BKL held */ |
| 1256 | printk(KERN_INFO "USB Serial deregistering driver %s\n", |
| 1257 | device->description); |
| 1258 | list_del(&device->driver_list); |
| 1259 | usb_serial_bus_deregister(device); |
| 1260 | } |
| 1261 | EXPORT_SYMBOL_GPL(usb_serial_deregister); |
| 1262 | |
| 1263 | /* Module information */ |
| 1264 | MODULE_AUTHOR(DRIVER_AUTHOR); |
| 1265 | MODULE_DESCRIPTION(DRIVER_DESC); |
| 1266 | MODULE_LICENSE("GPL"); |
| 1267 | |
| 1268 | module_param(debug, bool, S_IRUGO | S_IWUSR); |
| 1269 | MODULE_PARM_DESC(debug, "Debug enabled or not"); |