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Merge tag 'for-linus-v3.10-rc3' of git://oss.sgi.com/xfs/xfs
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / usb / serial / usb-serial.c
1 /*
2 * USB Serial Converter driver
3 *
4 * Copyright (C) 2009 - 2013 Johan Hovold (jhovold@gmail.com)
5 * Copyright (C) 1999 - 2012 Greg Kroah-Hartman (greg@kroah.com)
6 * Copyright (C) 2000 Peter Berger (pberger@brimson.com)
7 * Copyright (C) 2000 Al Borchers (borchers@steinerpoint.com)
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License version
11 * 2 as published by the Free Software Foundation.
12 *
13 * This driver was originally based on the ACM driver by Armin Fuerst (which was
14 * based on a driver by Brad Keryan)
15 *
16 * See Documentation/usb/usb-serial.txt for more information on using this
17 * driver
18 */
19
20 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
21
22 #include <linux/kernel.h>
23 #include <linux/errno.h>
24 #include <linux/init.h>
25 #include <linux/slab.h>
26 #include <linux/tty.h>
27 #include <linux/tty_driver.h>
28 #include <linux/tty_flip.h>
29 #include <linux/module.h>
30 #include <linux/moduleparam.h>
31 #include <linux/seq_file.h>
32 #include <linux/spinlock.h>
33 #include <linux/mutex.h>
34 #include <linux/list.h>
35 #include <linux/uaccess.h>
36 #include <linux/serial.h>
37 #include <linux/usb.h>
38 #include <linux/usb/serial.h>
39 #include <linux/kfifo.h>
40 #include "pl2303.h"
41
42 #define DRIVER_AUTHOR "Greg Kroah-Hartman <gregkh@linuxfoundation.org>"
43 #define DRIVER_DESC "USB Serial Driver core"
44
45 /* There is no MODULE_DEVICE_TABLE for usbserial.c. Instead
46 the MODULE_DEVICE_TABLE declarations in each serial driver
47 cause the "hotplug" program to pull in whatever module is necessary
48 via modprobe, and modprobe will load usbserial because the serial
49 drivers depend on it.
50 */
51
52 static struct usb_serial *serial_table[SERIAL_TTY_MINORS];
53 static DEFINE_MUTEX(table_lock);
54 static LIST_HEAD(usb_serial_driver_list);
55
56 /*
57 * Look up the serial structure. If it is found and it hasn't been
58 * disconnected, return with its disc_mutex held and its refcount
59 * incremented. Otherwise return NULL.
60 */
61 struct usb_serial *usb_serial_get_by_index(unsigned index)
62 {
63 struct usb_serial *serial;
64
65 mutex_lock(&table_lock);
66 serial = serial_table[index];
67
68 if (serial) {
69 mutex_lock(&serial->disc_mutex);
70 if (serial->disconnected) {
71 mutex_unlock(&serial->disc_mutex);
72 serial = NULL;
73 } else {
74 kref_get(&serial->kref);
75 }
76 }
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 dev_dbg(&serial->interface->dev, "%s %d\n", __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 dev_dbg(&serial->interface->dev, "%s - minor base = %d\n", __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 mutex_lock(&table_lock);
124 for (i = 0; i < serial->num_ports; ++i)
125 serial_table[serial->minor + i] = NULL;
126 mutex_unlock(&table_lock);
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 /* return the minor range that this device had */
138 if (serial->minor != SERIAL_TTY_NO_MINOR)
139 return_serial(serial);
140
141 if (serial->attached && serial->type->release)
142 serial->type->release(serial);
143
144 /* Now that nothing is using the ports, they can be freed */
145 for (i = 0; i < serial->num_port_pointers; ++i) {
146 port = serial->port[i];
147 if (port) {
148 port->serial = NULL;
149 put_device(&port->dev);
150 }
151 }
152
153 usb_put_intf(serial->interface);
154 usb_put_dev(serial->dev);
155 kfree(serial);
156 }
157
158 void usb_serial_put(struct usb_serial *serial)
159 {
160 kref_put(&serial->kref, destroy_serial);
161 }
162
163 /*****************************************************************************
164 * Driver tty interface functions
165 *****************************************************************************/
166
167 /**
168 * serial_install - install tty
169 * @driver: the driver (USB in our case)
170 * @tty: the tty being created
171 *
172 * Create the termios objects for this tty. We use the default
173 * USB serial settings but permit them to be overridden by
174 * serial->type->init_termios.
175 *
176 * This is the first place a new tty gets used. Hence this is where we
177 * acquire references to the usb_serial structure and the driver module,
178 * where we store a pointer to the port, and where we do an autoresume.
179 * All these actions are reversed in serial_cleanup().
180 */
181 static int serial_install(struct tty_driver *driver, struct tty_struct *tty)
182 {
183 int idx = tty->index;
184 struct usb_serial *serial;
185 struct usb_serial_port *port;
186 int retval = -ENODEV;
187
188 serial = usb_serial_get_by_index(idx);
189 if (!serial)
190 return retval;
191
192 port = serial->port[idx - serial->minor];
193 if (!port)
194 goto error_no_port;
195 if (!try_module_get(serial->type->driver.owner))
196 goto error_module_get;
197
198 retval = usb_autopm_get_interface(serial->interface);
199 if (retval)
200 goto error_get_interface;
201
202 retval = tty_port_install(&port->port, driver, tty);
203 if (retval)
204 goto error_init_termios;
205
206 mutex_unlock(&serial->disc_mutex);
207
208 /* allow the driver to update the settings */
209 if (serial->type->init_termios)
210 serial->type->init_termios(tty);
211
212 tty->driver_data = port;
213
214 return retval;
215
216 error_init_termios:
217 usb_autopm_put_interface(serial->interface);
218 error_get_interface:
219 module_put(serial->type->driver.owner);
220 error_module_get:
221 error_no_port:
222 usb_serial_put(serial);
223 mutex_unlock(&serial->disc_mutex);
224 return retval;
225 }
226
227 static int serial_port_activate(struct tty_port *tport, struct tty_struct *tty)
228 {
229 struct usb_serial_port *port =
230 container_of(tport, struct usb_serial_port, port);
231 struct usb_serial *serial = port->serial;
232 int retval;
233
234 mutex_lock(&serial->disc_mutex);
235 if (serial->disconnected)
236 retval = -ENODEV;
237 else
238 retval = port->serial->type->open(tty, port);
239 mutex_unlock(&serial->disc_mutex);
240
241 if (retval < 0)
242 retval = usb_translate_errors(retval);
243
244 return retval;
245 }
246
247 static int serial_open(struct tty_struct *tty, struct file *filp)
248 {
249 struct usb_serial_port *port = tty->driver_data;
250
251 dev_dbg(tty->dev, "%s\n", __func__);
252
253 return tty_port_open(&port->port, tty, filp);
254 }
255
256 /**
257 * serial_port_shutdown - shut down hardware
258 * @tport: tty port to shut down
259 *
260 * Shut down a USB serial port. Serialized against activate by the
261 * tport mutex and kept to matching open/close pairs
262 * of calls by the ASYNCB_INITIALIZED flag.
263 *
264 * Not called if tty is console.
265 */
266 static void serial_port_shutdown(struct tty_port *tport)
267 {
268 struct usb_serial_port *port =
269 container_of(tport, struct usb_serial_port, port);
270 struct usb_serial_driver *drv = port->serial->type;
271
272 if (drv->close)
273 drv->close(port);
274 }
275
276 static void serial_hangup(struct tty_struct *tty)
277 {
278 struct usb_serial_port *port = tty->driver_data;
279
280 dev_dbg(tty->dev, "%s\n", __func__);
281
282 tty_port_hangup(&port->port);
283 }
284
285 static void serial_close(struct tty_struct *tty, struct file *filp)
286 {
287 struct usb_serial_port *port = tty->driver_data;
288
289 dev_dbg(tty->dev, "%s\n", __func__);
290
291 tty_port_close(&port->port, tty, filp);
292 }
293
294 /**
295 * serial_cleanup - free resources post close/hangup
296 * @port: port to free up
297 *
298 * Do the resource freeing and refcount dropping for the port.
299 * Avoid freeing the console.
300 *
301 * Called asynchronously after the last tty kref is dropped.
302 */
303 static void serial_cleanup(struct tty_struct *tty)
304 {
305 struct usb_serial_port *port = tty->driver_data;
306 struct usb_serial *serial;
307 struct module *owner;
308
309 dev_dbg(tty->dev, "%s\n", __func__);
310
311 /* The console is magical. Do not hang up the console hardware
312 * or there will be tears.
313 */
314 if (port->port.console)
315 return;
316
317 tty->driver_data = NULL;
318
319 serial = port->serial;
320 owner = serial->type->driver.owner;
321
322 mutex_lock(&serial->disc_mutex);
323 if (!serial->disconnected)
324 usb_autopm_put_interface(serial->interface);
325 mutex_unlock(&serial->disc_mutex);
326
327 usb_serial_put(serial);
328 module_put(owner);
329 }
330
331 static int serial_write(struct tty_struct *tty, const unsigned char *buf,
332 int count)
333 {
334 struct usb_serial_port *port = tty->driver_data;
335 int retval = -ENODEV;
336
337 if (port->serial->dev->state == USB_STATE_NOTATTACHED)
338 goto exit;
339
340 dev_dbg(tty->dev, "%s - %d byte(s)\n", __func__, count);
341
342 retval = port->serial->type->write(tty, port, buf, count);
343 if (retval < 0)
344 retval = usb_translate_errors(retval);
345 exit:
346 return retval;
347 }
348
349 static int serial_write_room(struct tty_struct *tty)
350 {
351 struct usb_serial_port *port = tty->driver_data;
352
353 dev_dbg(tty->dev, "%s\n", __func__);
354
355 return port->serial->type->write_room(tty);
356 }
357
358 static int serial_chars_in_buffer(struct tty_struct *tty)
359 {
360 struct usb_serial_port *port = tty->driver_data;
361 struct usb_serial *serial = port->serial;
362
363 dev_dbg(tty->dev, "%s\n", __func__);
364
365 if (serial->disconnected)
366 return 0;
367
368 return serial->type->chars_in_buffer(tty);
369 }
370
371 static void serial_wait_until_sent(struct tty_struct *tty, int timeout)
372 {
373 struct usb_serial_port *port = tty->driver_data;
374 struct usb_serial *serial = port->serial;
375
376 dev_dbg(tty->dev, "%s\n", __func__);
377
378 if (!port->serial->type->wait_until_sent)
379 return;
380
381 mutex_lock(&serial->disc_mutex);
382 if (!serial->disconnected)
383 port->serial->type->wait_until_sent(tty, timeout);
384 mutex_unlock(&serial->disc_mutex);
385 }
386
387 static void serial_throttle(struct tty_struct *tty)
388 {
389 struct usb_serial_port *port = tty->driver_data;
390
391 dev_dbg(tty->dev, "%s\n", __func__);
392
393 if (port->serial->type->throttle)
394 port->serial->type->throttle(tty);
395 }
396
397 static void serial_unthrottle(struct tty_struct *tty)
398 {
399 struct usb_serial_port *port = tty->driver_data;
400
401 dev_dbg(tty->dev, "%s\n", __func__);
402
403 if (port->serial->type->unthrottle)
404 port->serial->type->unthrottle(tty);
405 }
406
407 static int serial_ioctl(struct tty_struct *tty,
408 unsigned int cmd, unsigned long arg)
409 {
410 struct usb_serial_port *port = tty->driver_data;
411 int retval = -ENODEV;
412
413 dev_dbg(tty->dev, "%s - cmd 0x%.4x\n", __func__, cmd);
414
415 switch (cmd) {
416 case TIOCMIWAIT:
417 if (port->serial->type->tiocmiwait)
418 retval = port->serial->type->tiocmiwait(tty, arg);
419 break;
420 default:
421 if (port->serial->type->ioctl)
422 retval = port->serial->type->ioctl(tty, cmd, arg);
423 else
424 retval = -ENOIOCTLCMD;
425 }
426
427 return retval;
428 }
429
430 static void serial_set_termios(struct tty_struct *tty, struct ktermios *old)
431 {
432 struct usb_serial_port *port = tty->driver_data;
433
434 dev_dbg(tty->dev, "%s\n", __func__);
435
436 if (port->serial->type->set_termios)
437 port->serial->type->set_termios(tty, port, old);
438 else
439 tty_termios_copy_hw(&tty->termios, old);
440 }
441
442 static int serial_break(struct tty_struct *tty, int break_state)
443 {
444 struct usb_serial_port *port = tty->driver_data;
445
446 dev_dbg(tty->dev, "%s\n", __func__);
447
448 if (port->serial->type->break_ctl)
449 port->serial->type->break_ctl(tty, break_state);
450
451 return 0;
452 }
453
454 static int serial_proc_show(struct seq_file *m, void *v)
455 {
456 struct usb_serial *serial;
457 int i;
458 char tmp[40];
459
460 seq_puts(m, "usbserinfo:1.0 driver:2.0\n");
461 for (i = 0; i < SERIAL_TTY_MINORS; ++i) {
462 serial = usb_serial_get_by_index(i);
463 if (serial == NULL)
464 continue;
465
466 seq_printf(m, "%d:", i);
467 if (serial->type->driver.owner)
468 seq_printf(m, " module:%s",
469 module_name(serial->type->driver.owner));
470 seq_printf(m, " name:\"%s\"",
471 serial->type->description);
472 seq_printf(m, " vendor:%04x product:%04x",
473 le16_to_cpu(serial->dev->descriptor.idVendor),
474 le16_to_cpu(serial->dev->descriptor.idProduct));
475 seq_printf(m, " num_ports:%d", serial->num_ports);
476 seq_printf(m, " port:%d", i - serial->minor + 1);
477 usb_make_path(serial->dev, tmp, sizeof(tmp));
478 seq_printf(m, " path:%s", tmp);
479
480 seq_putc(m, '\n');
481 usb_serial_put(serial);
482 mutex_unlock(&serial->disc_mutex);
483 }
484 return 0;
485 }
486
487 static int serial_proc_open(struct inode *inode, struct file *file)
488 {
489 return single_open(file, serial_proc_show, NULL);
490 }
491
492 static const struct file_operations serial_proc_fops = {
493 .owner = THIS_MODULE,
494 .open = serial_proc_open,
495 .read = seq_read,
496 .llseek = seq_lseek,
497 .release = single_release,
498 };
499
500 static int serial_tiocmget(struct tty_struct *tty)
501 {
502 struct usb_serial_port *port = tty->driver_data;
503
504 dev_dbg(tty->dev, "%s\n", __func__);
505
506 if (port->serial->type->tiocmget)
507 return port->serial->type->tiocmget(tty);
508 return -EINVAL;
509 }
510
511 static int serial_tiocmset(struct tty_struct *tty,
512 unsigned int set, unsigned int clear)
513 {
514 struct usb_serial_port *port = tty->driver_data;
515
516 dev_dbg(tty->dev, "%s\n", __func__);
517
518 if (port->serial->type->tiocmset)
519 return port->serial->type->tiocmset(tty, set, clear);
520 return -EINVAL;
521 }
522
523 static int serial_get_icount(struct tty_struct *tty,
524 struct serial_icounter_struct *icount)
525 {
526 struct usb_serial_port *port = tty->driver_data;
527
528 dev_dbg(tty->dev, "%s\n", __func__);
529
530 if (port->serial->type->get_icount)
531 return port->serial->type->get_icount(tty, icount);
532 return -EINVAL;
533 }
534
535 /*
536 * We would be calling tty_wakeup here, but unfortunately some line
537 * disciplines have an annoying habit of calling tty->write from
538 * the write wakeup callback (e.g. n_hdlc.c).
539 */
540 void usb_serial_port_softint(struct usb_serial_port *port)
541 {
542 schedule_work(&port->work);
543 }
544 EXPORT_SYMBOL_GPL(usb_serial_port_softint);
545
546 static void usb_serial_port_work(struct work_struct *work)
547 {
548 struct usb_serial_port *port =
549 container_of(work, struct usb_serial_port, work);
550
551 tty_port_tty_wakeup(&port->port);
552 }
553
554 static void usb_serial_port_poison_urbs(struct usb_serial_port *port)
555 {
556 int i;
557
558 for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i)
559 usb_poison_urb(port->read_urbs[i]);
560 for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i)
561 usb_poison_urb(port->write_urbs[i]);
562
563 usb_poison_urb(port->interrupt_in_urb);
564 usb_poison_urb(port->interrupt_out_urb);
565 }
566
567 static void usb_serial_port_unpoison_urbs(struct usb_serial_port *port)
568 {
569 int i;
570
571 for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i)
572 usb_unpoison_urb(port->read_urbs[i]);
573 for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i)
574 usb_unpoison_urb(port->write_urbs[i]);
575
576 usb_unpoison_urb(port->interrupt_in_urb);
577 usb_unpoison_urb(port->interrupt_out_urb);
578 }
579
580 static void usb_serial_port_release(struct device *dev)
581 {
582 struct usb_serial_port *port = to_usb_serial_port(dev);
583 int i;
584
585 dev_dbg(dev, "%s\n", __func__);
586
587 usb_free_urb(port->interrupt_in_urb);
588 usb_free_urb(port->interrupt_out_urb);
589 for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) {
590 usb_free_urb(port->read_urbs[i]);
591 kfree(port->bulk_in_buffers[i]);
592 }
593 for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i) {
594 usb_free_urb(port->write_urbs[i]);
595 kfree(port->bulk_out_buffers[i]);
596 }
597 kfifo_free(&port->write_fifo);
598 kfree(port->interrupt_in_buffer);
599 kfree(port->interrupt_out_buffer);
600 tty_port_destroy(&port->port);
601 kfree(port);
602 }
603
604 static struct usb_serial *create_serial(struct usb_device *dev,
605 struct usb_interface *interface,
606 struct usb_serial_driver *driver)
607 {
608 struct usb_serial *serial;
609
610 serial = kzalloc(sizeof(*serial), GFP_KERNEL);
611 if (!serial)
612 return NULL;
613 serial->dev = usb_get_dev(dev);
614 serial->type = driver;
615 serial->interface = usb_get_intf(interface);
616 kref_init(&serial->kref);
617 mutex_init(&serial->disc_mutex);
618 serial->minor = SERIAL_TTY_NO_MINOR;
619
620 return serial;
621 }
622
623 static const struct usb_device_id *match_dynamic_id(struct usb_interface *intf,
624 struct usb_serial_driver *drv)
625 {
626 struct usb_dynid *dynid;
627
628 spin_lock(&drv->dynids.lock);
629 list_for_each_entry(dynid, &drv->dynids.list, node) {
630 if (usb_match_one_id(intf, &dynid->id)) {
631 spin_unlock(&drv->dynids.lock);
632 return &dynid->id;
633 }
634 }
635 spin_unlock(&drv->dynids.lock);
636 return NULL;
637 }
638
639 static const struct usb_device_id *get_iface_id(struct usb_serial_driver *drv,
640 struct usb_interface *intf)
641 {
642 const struct usb_device_id *id;
643
644 id = usb_match_id(intf, drv->id_table);
645 if (id) {
646 dev_dbg(&intf->dev, "static descriptor matches\n");
647 goto exit;
648 }
649 id = match_dynamic_id(intf, drv);
650 if (id)
651 dev_dbg(&intf->dev, "dynamic descriptor matches\n");
652 exit:
653 return id;
654 }
655
656 /* Caller must hold table_lock */
657 static struct usb_serial_driver *search_serial_device(
658 struct usb_interface *iface)
659 {
660 const struct usb_device_id *id = NULL;
661 struct usb_serial_driver *drv;
662 struct usb_driver *driver = to_usb_driver(iface->dev.driver);
663
664 /* Check if the usb id matches a known device */
665 list_for_each_entry(drv, &usb_serial_driver_list, driver_list) {
666 if (drv->usb_driver == driver)
667 id = get_iface_id(drv, iface);
668 if (id)
669 return drv;
670 }
671
672 return NULL;
673 }
674
675 static int serial_port_carrier_raised(struct tty_port *port)
676 {
677 struct usb_serial_port *p = container_of(port, struct usb_serial_port, port);
678 struct usb_serial_driver *drv = p->serial->type;
679
680 if (drv->carrier_raised)
681 return drv->carrier_raised(p);
682 /* No carrier control - don't block */
683 return 1;
684 }
685
686 static void serial_port_dtr_rts(struct tty_port *port, int on)
687 {
688 struct usb_serial_port *p = container_of(port, struct usb_serial_port, port);
689 struct usb_serial *serial = p->serial;
690 struct usb_serial_driver *drv = serial->type;
691
692 if (!drv->dtr_rts)
693 return;
694 /*
695 * Work-around bug in the tty-layer which can result in dtr_rts
696 * being called after a disconnect (and tty_unregister_device
697 * has returned). Remove once bug has been squashed.
698 */
699 mutex_lock(&serial->disc_mutex);
700 if (!serial->disconnected)
701 drv->dtr_rts(p, on);
702 mutex_unlock(&serial->disc_mutex);
703 }
704
705 static const struct tty_port_operations serial_port_ops = {
706 .carrier_raised = serial_port_carrier_raised,
707 .dtr_rts = serial_port_dtr_rts,
708 .activate = serial_port_activate,
709 .shutdown = serial_port_shutdown,
710 };
711
712 static int usb_serial_probe(struct usb_interface *interface,
713 const struct usb_device_id *id)
714 {
715 struct device *ddev = &interface->dev;
716 struct usb_device *dev = interface_to_usbdev(interface);
717 struct usb_serial *serial = NULL;
718 struct usb_serial_port *port;
719 struct usb_host_interface *iface_desc;
720 struct usb_endpoint_descriptor *endpoint;
721 struct usb_endpoint_descriptor *interrupt_in_endpoint[MAX_NUM_PORTS];
722 struct usb_endpoint_descriptor *interrupt_out_endpoint[MAX_NUM_PORTS];
723 struct usb_endpoint_descriptor *bulk_in_endpoint[MAX_NUM_PORTS];
724 struct usb_endpoint_descriptor *bulk_out_endpoint[MAX_NUM_PORTS];
725 struct usb_serial_driver *type = NULL;
726 int retval;
727 unsigned int minor;
728 int buffer_size;
729 int i;
730 int j;
731 int num_interrupt_in = 0;
732 int num_interrupt_out = 0;
733 int num_bulk_in = 0;
734 int num_bulk_out = 0;
735 int num_ports = 0;
736 int max_endpoints;
737
738 mutex_lock(&table_lock);
739 type = search_serial_device(interface);
740 if (!type) {
741 mutex_unlock(&table_lock);
742 dev_dbg(ddev, "none matched\n");
743 return -ENODEV;
744 }
745
746 if (!try_module_get(type->driver.owner)) {
747 mutex_unlock(&table_lock);
748 dev_err(ddev, "module get failed, exiting\n");
749 return -EIO;
750 }
751 mutex_unlock(&table_lock);
752
753 serial = create_serial(dev, interface, type);
754 if (!serial) {
755 module_put(type->driver.owner);
756 return -ENOMEM;
757 }
758
759 /* if this device type has a probe function, call it */
760 if (type->probe) {
761 const struct usb_device_id *id;
762
763 id = get_iface_id(type, interface);
764 retval = type->probe(serial, id);
765
766 if (retval) {
767 dev_dbg(ddev, "sub driver rejected device\n");
768 usb_serial_put(serial);
769 module_put(type->driver.owner);
770 return retval;
771 }
772 }
773
774 /* descriptor matches, let's find the endpoints needed */
775 /* check out the endpoints */
776 iface_desc = interface->cur_altsetting;
777 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
778 endpoint = &iface_desc->endpoint[i].desc;
779
780 if (usb_endpoint_is_bulk_in(endpoint)) {
781 /* we found a bulk in endpoint */
782 dev_dbg(ddev, "found bulk in on endpoint %d\n", i);
783 bulk_in_endpoint[num_bulk_in] = endpoint;
784 ++num_bulk_in;
785 }
786
787 if (usb_endpoint_is_bulk_out(endpoint)) {
788 /* we found a bulk out endpoint */
789 dev_dbg(ddev, "found bulk out on endpoint %d\n", i);
790 bulk_out_endpoint[num_bulk_out] = endpoint;
791 ++num_bulk_out;
792 }
793
794 if (usb_endpoint_is_int_in(endpoint)) {
795 /* we found a interrupt in endpoint */
796 dev_dbg(ddev, "found interrupt in on endpoint %d\n", i);
797 interrupt_in_endpoint[num_interrupt_in] = endpoint;
798 ++num_interrupt_in;
799 }
800
801 if (usb_endpoint_is_int_out(endpoint)) {
802 /* we found an interrupt out endpoint */
803 dev_dbg(ddev, "found interrupt out on endpoint %d\n", i);
804 interrupt_out_endpoint[num_interrupt_out] = endpoint;
805 ++num_interrupt_out;
806 }
807 }
808
809 #if defined(CONFIG_USB_SERIAL_PL2303) || defined(CONFIG_USB_SERIAL_PL2303_MODULE)
810 /* BEGIN HORRIBLE HACK FOR PL2303 */
811 /* this is needed due to the looney way its endpoints are set up */
812 if (((le16_to_cpu(dev->descriptor.idVendor) == PL2303_VENDOR_ID) &&
813 (le16_to_cpu(dev->descriptor.idProduct) == PL2303_PRODUCT_ID)) ||
814 ((le16_to_cpu(dev->descriptor.idVendor) == ATEN_VENDOR_ID) &&
815 (le16_to_cpu(dev->descriptor.idProduct) == ATEN_PRODUCT_ID)) ||
816 ((le16_to_cpu(dev->descriptor.idVendor) == ALCOR_VENDOR_ID) &&
817 (le16_to_cpu(dev->descriptor.idProduct) == ALCOR_PRODUCT_ID)) ||
818 ((le16_to_cpu(dev->descriptor.idVendor) == SIEMENS_VENDOR_ID) &&
819 (le16_to_cpu(dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_EF81))) {
820 if (interface != dev->actconfig->interface[0]) {
821 /* check out the endpoints of the other interface*/
822 iface_desc = dev->actconfig->interface[0]->cur_altsetting;
823 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
824 endpoint = &iface_desc->endpoint[i].desc;
825 if (usb_endpoint_is_int_in(endpoint)) {
826 /* we found a interrupt in endpoint */
827 dev_dbg(ddev, "found interrupt in for Prolific device on separate interface\n");
828 interrupt_in_endpoint[num_interrupt_in] = endpoint;
829 ++num_interrupt_in;
830 }
831 }
832 }
833
834 /* Now make sure the PL-2303 is configured correctly.
835 * If not, give up now and hope this hack will work
836 * properly during a later invocation of usb_serial_probe
837 */
838 if (num_bulk_in == 0 || num_bulk_out == 0) {
839 dev_info(ddev, "PL-2303 hack: descriptors matched but endpoints did not\n");
840 usb_serial_put(serial);
841 module_put(type->driver.owner);
842 return -ENODEV;
843 }
844 }
845 /* END HORRIBLE HACK FOR PL2303 */
846 #endif
847
848 #ifdef CONFIG_USB_SERIAL_GENERIC
849 if (type == &usb_serial_generic_device) {
850 num_ports = num_bulk_out;
851 if (num_ports == 0) {
852 dev_err(ddev, "Generic device with no bulk out, not allowed.\n");
853 usb_serial_put(serial);
854 module_put(type->driver.owner);
855 return -EIO;
856 }
857 dev_info(ddev, "The \"generic\" usb-serial driver is only for testing and one-off prototypes.\n");
858 dev_info(ddev, "Tell linux-usb@vger.kernel.org to add your device to a proper driver.\n");
859 }
860 #endif
861 if (!num_ports) {
862 /* if this device type has a calc_num_ports function, call it */
863 if (type->calc_num_ports)
864 num_ports = type->calc_num_ports(serial);
865 if (!num_ports)
866 num_ports = type->num_ports;
867 }
868
869 serial->num_ports = num_ports;
870 serial->num_bulk_in = num_bulk_in;
871 serial->num_bulk_out = num_bulk_out;
872 serial->num_interrupt_in = num_interrupt_in;
873 serial->num_interrupt_out = num_interrupt_out;
874
875 /* found all that we need */
876 dev_info(ddev, "%s converter detected\n", type->description);
877
878 /* create our ports, we need as many as the max endpoints */
879 /* we don't use num_ports here because some devices have more
880 endpoint pairs than ports */
881 max_endpoints = max(num_bulk_in, num_bulk_out);
882 max_endpoints = max(max_endpoints, num_interrupt_in);
883 max_endpoints = max(max_endpoints, num_interrupt_out);
884 max_endpoints = max(max_endpoints, (int)serial->num_ports);
885 serial->num_port_pointers = max_endpoints;
886
887 dev_dbg(ddev, "setting up %d port structures for this device", max_endpoints);
888 for (i = 0; i < max_endpoints; ++i) {
889 port = kzalloc(sizeof(struct usb_serial_port), GFP_KERNEL);
890 if (!port)
891 goto probe_error;
892 tty_port_init(&port->port);
893 port->port.ops = &serial_port_ops;
894 port->serial = serial;
895 spin_lock_init(&port->lock);
896 /* Keep this for private driver use for the moment but
897 should probably go away */
898 INIT_WORK(&port->work, usb_serial_port_work);
899 serial->port[i] = port;
900 port->dev.parent = &interface->dev;
901 port->dev.driver = NULL;
902 port->dev.bus = &usb_serial_bus_type;
903 port->dev.release = &usb_serial_port_release;
904 device_initialize(&port->dev);
905 }
906
907 /* set up the endpoint information */
908 for (i = 0; i < num_bulk_in; ++i) {
909 endpoint = bulk_in_endpoint[i];
910 port = serial->port[i];
911 buffer_size = max_t(int, serial->type->bulk_in_size,
912 usb_endpoint_maxp(endpoint));
913 port->bulk_in_size = buffer_size;
914 port->bulk_in_endpointAddress = endpoint->bEndpointAddress;
915
916 for (j = 0; j < ARRAY_SIZE(port->read_urbs); ++j) {
917 set_bit(j, &port->read_urbs_free);
918 port->read_urbs[j] = usb_alloc_urb(0, GFP_KERNEL);
919 if (!port->read_urbs[j])
920 goto probe_error;
921 port->bulk_in_buffers[j] = kmalloc(buffer_size,
922 GFP_KERNEL);
923 if (!port->bulk_in_buffers[j])
924 goto probe_error;
925 usb_fill_bulk_urb(port->read_urbs[j], dev,
926 usb_rcvbulkpipe(dev,
927 endpoint->bEndpointAddress),
928 port->bulk_in_buffers[j], buffer_size,
929 serial->type->read_bulk_callback,
930 port);
931 }
932
933 port->read_urb = port->read_urbs[0];
934 port->bulk_in_buffer = port->bulk_in_buffers[0];
935 }
936
937 for (i = 0; i < num_bulk_out; ++i) {
938 endpoint = bulk_out_endpoint[i];
939 port = serial->port[i];
940 if (kfifo_alloc(&port->write_fifo, PAGE_SIZE, GFP_KERNEL))
941 goto probe_error;
942 buffer_size = serial->type->bulk_out_size;
943 if (!buffer_size)
944 buffer_size = usb_endpoint_maxp(endpoint);
945 port->bulk_out_size = buffer_size;
946 port->bulk_out_endpointAddress = endpoint->bEndpointAddress;
947
948 for (j = 0; j < ARRAY_SIZE(port->write_urbs); ++j) {
949 set_bit(j, &port->write_urbs_free);
950 port->write_urbs[j] = usb_alloc_urb(0, GFP_KERNEL);
951 if (!port->write_urbs[j])
952 goto probe_error;
953 port->bulk_out_buffers[j] = kmalloc(buffer_size,
954 GFP_KERNEL);
955 if (!port->bulk_out_buffers[j])
956 goto probe_error;
957 usb_fill_bulk_urb(port->write_urbs[j], dev,
958 usb_sndbulkpipe(dev,
959 endpoint->bEndpointAddress),
960 port->bulk_out_buffers[j], buffer_size,
961 serial->type->write_bulk_callback,
962 port);
963 }
964
965 port->write_urb = port->write_urbs[0];
966 port->bulk_out_buffer = port->bulk_out_buffers[0];
967 }
968
969 if (serial->type->read_int_callback) {
970 for (i = 0; i < num_interrupt_in; ++i) {
971 endpoint = interrupt_in_endpoint[i];
972 port = serial->port[i];
973 port->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
974 if (!port->interrupt_in_urb)
975 goto probe_error;
976 buffer_size = usb_endpoint_maxp(endpoint);
977 port->interrupt_in_endpointAddress =
978 endpoint->bEndpointAddress;
979 port->interrupt_in_buffer = kmalloc(buffer_size,
980 GFP_KERNEL);
981 if (!port->interrupt_in_buffer)
982 goto probe_error;
983 usb_fill_int_urb(port->interrupt_in_urb, dev,
984 usb_rcvintpipe(dev,
985 endpoint->bEndpointAddress),
986 port->interrupt_in_buffer, buffer_size,
987 serial->type->read_int_callback, port,
988 endpoint->bInterval);
989 }
990 } else if (num_interrupt_in) {
991 dev_dbg(ddev, "The device claims to support interrupt in transfers, but read_int_callback is not defined\n");
992 }
993
994 if (serial->type->write_int_callback) {
995 for (i = 0; i < num_interrupt_out; ++i) {
996 endpoint = interrupt_out_endpoint[i];
997 port = serial->port[i];
998 port->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
999 if (!port->interrupt_out_urb)
1000 goto probe_error;
1001 buffer_size = usb_endpoint_maxp(endpoint);
1002 port->interrupt_out_size = buffer_size;
1003 port->interrupt_out_endpointAddress =
1004 endpoint->bEndpointAddress;
1005 port->interrupt_out_buffer = kmalloc(buffer_size,
1006 GFP_KERNEL);
1007 if (!port->interrupt_out_buffer)
1008 goto probe_error;
1009 usb_fill_int_urb(port->interrupt_out_urb, dev,
1010 usb_sndintpipe(dev,
1011 endpoint->bEndpointAddress),
1012 port->interrupt_out_buffer, buffer_size,
1013 serial->type->write_int_callback, port,
1014 endpoint->bInterval);
1015 }
1016 } else if (num_interrupt_out) {
1017 dev_dbg(ddev, "The device claims to support interrupt out transfers, but write_int_callback is not defined\n");
1018 }
1019
1020 usb_set_intfdata(interface, serial);
1021
1022 /* if this device type has an attach function, call it */
1023 if (type->attach) {
1024 retval = type->attach(serial);
1025 if (retval < 0)
1026 goto probe_error;
1027 serial->attached = 1;
1028 if (retval > 0) {
1029 /* quietly accept this device, but don't bind to a
1030 serial port as it's about to disappear */
1031 serial->num_ports = 0;
1032 goto exit;
1033 }
1034 } else {
1035 serial->attached = 1;
1036 }
1037
1038 /* Avoid race with tty_open and serial_install by setting the
1039 * disconnected flag and not clearing it until all ports have been
1040 * registered.
1041 */
1042 serial->disconnected = 1;
1043
1044 if (get_free_serial(serial, num_ports, &minor) == NULL) {
1045 dev_err(ddev, "No more free serial devices\n");
1046 goto probe_error;
1047 }
1048 serial->minor = minor;
1049
1050 /* register all of the individual ports with the driver core */
1051 for (i = 0; i < num_ports; ++i) {
1052 port = serial->port[i];
1053 dev_set_name(&port->dev, "ttyUSB%d", port->number);
1054 dev_dbg(ddev, "registering %s", dev_name(&port->dev));
1055 device_enable_async_suspend(&port->dev);
1056
1057 retval = device_add(&port->dev);
1058 if (retval)
1059 dev_err(ddev, "Error registering port device, continuing\n");
1060 }
1061
1062 serial->disconnected = 0;
1063
1064 usb_serial_console_init(minor);
1065 exit:
1066 module_put(type->driver.owner);
1067 return 0;
1068
1069 probe_error:
1070 usb_serial_put(serial);
1071 module_put(type->driver.owner);
1072 return -EIO;
1073 }
1074
1075 static void usb_serial_disconnect(struct usb_interface *interface)
1076 {
1077 int i;
1078 struct usb_serial *serial = usb_get_intfdata(interface);
1079 struct device *dev = &interface->dev;
1080 struct usb_serial_port *port;
1081
1082 usb_serial_console_disconnect(serial);
1083
1084 mutex_lock(&serial->disc_mutex);
1085 /* must set a flag, to signal subdrivers */
1086 serial->disconnected = 1;
1087 mutex_unlock(&serial->disc_mutex);
1088
1089 for (i = 0; i < serial->num_ports; ++i) {
1090 port = serial->port[i];
1091 if (port) {
1092 struct tty_struct *tty = tty_port_tty_get(&port->port);
1093 if (tty) {
1094 tty_vhangup(tty);
1095 tty_kref_put(tty);
1096 }
1097 usb_serial_port_poison_urbs(port);
1098 wake_up_interruptible(&port->port.delta_msr_wait);
1099 cancel_work_sync(&port->work);
1100 if (device_is_registered(&port->dev))
1101 device_del(&port->dev);
1102 }
1103 }
1104 if (serial->type->disconnect)
1105 serial->type->disconnect(serial);
1106
1107 /* let the last holder of this object cause it to be cleaned up */
1108 usb_serial_put(serial);
1109 dev_info(dev, "device disconnected\n");
1110 }
1111
1112 int usb_serial_suspend(struct usb_interface *intf, pm_message_t message)
1113 {
1114 struct usb_serial *serial = usb_get_intfdata(intf);
1115 struct usb_serial_port *port;
1116 int i, r = 0;
1117
1118 serial->suspending = 1;
1119
1120 /*
1121 * serial->type->suspend() MUST return 0 in system sleep context,
1122 * otherwise, the resume callback has to recover device from
1123 * previous suspend failure.
1124 */
1125 if (serial->type->suspend) {
1126 r = serial->type->suspend(serial, message);
1127 if (r < 0) {
1128 serial->suspending = 0;
1129 goto err_out;
1130 }
1131 }
1132
1133 for (i = 0; i < serial->num_ports; ++i) {
1134 port = serial->port[i];
1135 if (port)
1136 usb_serial_port_poison_urbs(port);
1137 }
1138
1139 err_out:
1140 return r;
1141 }
1142 EXPORT_SYMBOL(usb_serial_suspend);
1143
1144 static void usb_serial_unpoison_port_urbs(struct usb_serial *serial)
1145 {
1146 struct usb_serial_port *port;
1147 int i;
1148
1149 for (i = 0; i < serial->num_ports; ++i) {
1150 port = serial->port[i];
1151 if (port)
1152 usb_serial_port_unpoison_urbs(port);
1153 }
1154 }
1155
1156 int usb_serial_resume(struct usb_interface *intf)
1157 {
1158 struct usb_serial *serial = usb_get_intfdata(intf);
1159 int rv;
1160
1161 usb_serial_unpoison_port_urbs(serial);
1162
1163 serial->suspending = 0;
1164 if (serial->type->resume)
1165 rv = serial->type->resume(serial);
1166 else
1167 rv = usb_serial_generic_resume(serial);
1168
1169 return rv;
1170 }
1171 EXPORT_SYMBOL(usb_serial_resume);
1172
1173 static int usb_serial_reset_resume(struct usb_interface *intf)
1174 {
1175 struct usb_serial *serial = usb_get_intfdata(intf);
1176 int rv;
1177
1178 usb_serial_unpoison_port_urbs(serial);
1179
1180 serial->suspending = 0;
1181 if (serial->type->reset_resume)
1182 rv = serial->type->reset_resume(serial);
1183 else {
1184 rv = -EOPNOTSUPP;
1185 intf->needs_binding = 1;
1186 }
1187
1188 return rv;
1189 }
1190
1191 static const struct tty_operations serial_ops = {
1192 .open = serial_open,
1193 .close = serial_close,
1194 .write = serial_write,
1195 .hangup = serial_hangup,
1196 .write_room = serial_write_room,
1197 .ioctl = serial_ioctl,
1198 .set_termios = serial_set_termios,
1199 .throttle = serial_throttle,
1200 .unthrottle = serial_unthrottle,
1201 .break_ctl = serial_break,
1202 .chars_in_buffer = serial_chars_in_buffer,
1203 .wait_until_sent = serial_wait_until_sent,
1204 .tiocmget = serial_tiocmget,
1205 .tiocmset = serial_tiocmset,
1206 .get_icount = serial_get_icount,
1207 .cleanup = serial_cleanup,
1208 .install = serial_install,
1209 .proc_fops = &serial_proc_fops,
1210 };
1211
1212
1213 struct tty_driver *usb_serial_tty_driver;
1214
1215 /* Driver structure we register with the USB core */
1216 static struct usb_driver usb_serial_driver = {
1217 .name = "usbserial",
1218 .probe = usb_serial_probe,
1219 .disconnect = usb_serial_disconnect,
1220 .suspend = usb_serial_suspend,
1221 .resume = usb_serial_resume,
1222 .no_dynamic_id = 1,
1223 .supports_autosuspend = 1,
1224 };
1225
1226 static int __init usb_serial_init(void)
1227 {
1228 int i;
1229 int result;
1230
1231 usb_serial_tty_driver = alloc_tty_driver(SERIAL_TTY_MINORS);
1232 if (!usb_serial_tty_driver)
1233 return -ENOMEM;
1234
1235 /* Initialize our global data */
1236 for (i = 0; i < SERIAL_TTY_MINORS; ++i)
1237 serial_table[i] = NULL;
1238
1239 result = bus_register(&usb_serial_bus_type);
1240 if (result) {
1241 pr_err("%s - registering bus driver failed\n", __func__);
1242 goto exit_bus;
1243 }
1244
1245 usb_serial_tty_driver->driver_name = "usbserial";
1246 usb_serial_tty_driver->name = "ttyUSB";
1247 usb_serial_tty_driver->major = SERIAL_TTY_MAJOR;
1248 usb_serial_tty_driver->minor_start = 0;
1249 usb_serial_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
1250 usb_serial_tty_driver->subtype = SERIAL_TYPE_NORMAL;
1251 usb_serial_tty_driver->flags = TTY_DRIVER_REAL_RAW |
1252 TTY_DRIVER_DYNAMIC_DEV;
1253 usb_serial_tty_driver->init_termios = tty_std_termios;
1254 usb_serial_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD
1255 | HUPCL | CLOCAL;
1256 usb_serial_tty_driver->init_termios.c_ispeed = 9600;
1257 usb_serial_tty_driver->init_termios.c_ospeed = 9600;
1258 tty_set_operations(usb_serial_tty_driver, &serial_ops);
1259 result = tty_register_driver(usb_serial_tty_driver);
1260 if (result) {
1261 pr_err("%s - tty_register_driver failed\n", __func__);
1262 goto exit_reg_driver;
1263 }
1264
1265 /* register the USB driver */
1266 result = usb_register(&usb_serial_driver);
1267 if (result < 0) {
1268 pr_err("%s - usb_register failed\n", __func__);
1269 goto exit_tty;
1270 }
1271
1272 /* register the generic driver, if we should */
1273 result = usb_serial_generic_register();
1274 if (result < 0) {
1275 pr_err("%s - registering generic driver failed\n", __func__);
1276 goto exit_generic;
1277 }
1278
1279 return result;
1280
1281 exit_generic:
1282 usb_deregister(&usb_serial_driver);
1283
1284 exit_tty:
1285 tty_unregister_driver(usb_serial_tty_driver);
1286
1287 exit_reg_driver:
1288 bus_unregister(&usb_serial_bus_type);
1289
1290 exit_bus:
1291 pr_err("%s - returning with error %d\n", __func__, result);
1292 put_tty_driver(usb_serial_tty_driver);
1293 return result;
1294 }
1295
1296
1297 static void __exit usb_serial_exit(void)
1298 {
1299 usb_serial_console_exit();
1300
1301 usb_serial_generic_deregister();
1302
1303 usb_deregister(&usb_serial_driver);
1304 tty_unregister_driver(usb_serial_tty_driver);
1305 put_tty_driver(usb_serial_tty_driver);
1306 bus_unregister(&usb_serial_bus_type);
1307 }
1308
1309
1310 module_init(usb_serial_init);
1311 module_exit(usb_serial_exit);
1312
1313 #define set_to_generic_if_null(type, function) \
1314 do { \
1315 if (!type->function) { \
1316 type->function = usb_serial_generic_##function; \
1317 pr_debug("%s: using generic " #function "\n", \
1318 type->driver.name); \
1319 } \
1320 } while (0)
1321
1322 static void usb_serial_operations_init(struct usb_serial_driver *device)
1323 {
1324 set_to_generic_if_null(device, open);
1325 set_to_generic_if_null(device, write);
1326 set_to_generic_if_null(device, close);
1327 set_to_generic_if_null(device, write_room);
1328 set_to_generic_if_null(device, chars_in_buffer);
1329 if (device->tx_empty)
1330 set_to_generic_if_null(device, wait_until_sent);
1331 set_to_generic_if_null(device, read_bulk_callback);
1332 set_to_generic_if_null(device, write_bulk_callback);
1333 set_to_generic_if_null(device, process_read_urb);
1334 set_to_generic_if_null(device, prepare_write_buffer);
1335 }
1336
1337 static int usb_serial_register(struct usb_serial_driver *driver)
1338 {
1339 int retval;
1340
1341 if (usb_disabled())
1342 return -ENODEV;
1343
1344 if (!driver->description)
1345 driver->description = driver->driver.name;
1346 if (!driver->usb_driver) {
1347 WARN(1, "Serial driver %s has no usb_driver\n",
1348 driver->description);
1349 return -EINVAL;
1350 }
1351
1352 usb_serial_operations_init(driver);
1353
1354 /* Add this device to our list of devices */
1355 mutex_lock(&table_lock);
1356 list_add(&driver->driver_list, &usb_serial_driver_list);
1357
1358 retval = usb_serial_bus_register(driver);
1359 if (retval) {
1360 pr_err("problem %d when registering driver %s\n", retval, driver->description);
1361 list_del(&driver->driver_list);
1362 } else
1363 pr_info("USB Serial support registered for %s\n", driver->description);
1364
1365 mutex_unlock(&table_lock);
1366 return retval;
1367 }
1368
1369 static void usb_serial_deregister(struct usb_serial_driver *device)
1370 {
1371 pr_info("USB Serial deregistering driver %s\n", device->description);
1372 mutex_lock(&table_lock);
1373 list_del(&device->driver_list);
1374 usb_serial_bus_deregister(device);
1375 mutex_unlock(&table_lock);
1376 }
1377
1378 /**
1379 * usb_serial_register_drivers - register drivers for a usb-serial module
1380 * @serial_drivers: NULL-terminated array of pointers to drivers to be registered
1381 * @name: name of the usb_driver for this set of @serial_drivers
1382 * @id_table: list of all devices this @serial_drivers set binds to
1383 *
1384 * Registers all the drivers in the @serial_drivers array, and dynamically
1385 * creates a struct usb_driver with the name @name and id_table of @id_table.
1386 */
1387 int usb_serial_register_drivers(struct usb_serial_driver *const serial_drivers[],
1388 const char *name,
1389 const struct usb_device_id *id_table)
1390 {
1391 int rc;
1392 struct usb_driver *udriver;
1393 struct usb_serial_driver * const *sd;
1394
1395 /*
1396 * udriver must be registered before any of the serial drivers,
1397 * because the store_new_id() routine for the serial drivers (in
1398 * bus.c) probes udriver.
1399 *
1400 * Performance hack: We don't want udriver to be probed until
1401 * the serial drivers are registered, because the probe would
1402 * simply fail for lack of a matching serial driver.
1403 * So we leave udriver's id_table set to NULL until we are all set.
1404 *
1405 * Suspend/resume support is implemented in the usb-serial core,
1406 * so fill in the PM-related fields in udriver.
1407 */
1408 udriver = kzalloc(sizeof(*udriver), GFP_KERNEL);
1409 if (!udriver)
1410 return -ENOMEM;
1411
1412 udriver->name = name;
1413 udriver->no_dynamic_id = 1;
1414 udriver->supports_autosuspend = 1;
1415 udriver->suspend = usb_serial_suspend;
1416 udriver->resume = usb_serial_resume;
1417 udriver->probe = usb_serial_probe;
1418 udriver->disconnect = usb_serial_disconnect;
1419
1420 /* we only set the reset_resume field if the serial_driver has one */
1421 for (sd = serial_drivers; *sd; ++sd) {
1422 if ((*sd)->reset_resume) {
1423 udriver->reset_resume = usb_serial_reset_resume;
1424 break;
1425 }
1426 }
1427
1428 rc = usb_register(udriver);
1429 if (rc)
1430 return rc;
1431
1432 for (sd = serial_drivers; *sd; ++sd) {
1433 (*sd)->usb_driver = udriver;
1434 rc = usb_serial_register(*sd);
1435 if (rc)
1436 goto failed;
1437 }
1438
1439 /* Now set udriver's id_table and look for matches */
1440 udriver->id_table = id_table;
1441 rc = driver_attach(&udriver->drvwrap.driver);
1442 return 0;
1443
1444 failed:
1445 while (sd-- > serial_drivers)
1446 usb_serial_deregister(*sd);
1447 usb_deregister(udriver);
1448 return rc;
1449 }
1450 EXPORT_SYMBOL_GPL(usb_serial_register_drivers);
1451
1452 /**
1453 * usb_serial_deregister_drivers - deregister drivers for a usb-serial module
1454 * @serial_drivers: NULL-terminated array of pointers to drivers to be deregistered
1455 *
1456 * Deregisters all the drivers in the @serial_drivers array and deregisters and
1457 * frees the struct usb_driver that was created by the call to
1458 * usb_serial_register_drivers().
1459 */
1460 void usb_serial_deregister_drivers(struct usb_serial_driver *const serial_drivers[])
1461 {
1462 struct usb_driver *udriver = (*serial_drivers)->usb_driver;
1463
1464 for (; *serial_drivers; ++serial_drivers)
1465 usb_serial_deregister(*serial_drivers);
1466 usb_deregister(udriver);
1467 kfree(udriver);
1468 }
1469 EXPORT_SYMBOL_GPL(usb_serial_deregister_drivers);
1470
1471 MODULE_AUTHOR(DRIVER_AUTHOR);
1472 MODULE_DESCRIPTION(DRIVER_DESC);
1473 MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)