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Merge remote-tracking branch 'asoc/fix/wm8994' into asoc-linus
[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 = -ENOIOCTLCMD;
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 }
424
425 return retval;
426 }
427
428 static void serial_set_termios(struct tty_struct *tty, struct ktermios *old)
429 {
430 struct usb_serial_port *port = tty->driver_data;
431
432 dev_dbg(tty->dev, "%s\n", __func__);
433
434 if (port->serial->type->set_termios)
435 port->serial->type->set_termios(tty, port, old);
436 else
437 tty_termios_copy_hw(&tty->termios, old);
438 }
439
440 static int serial_break(struct tty_struct *tty, int break_state)
441 {
442 struct usb_serial_port *port = tty->driver_data;
443
444 dev_dbg(tty->dev, "%s\n", __func__);
445
446 if (port->serial->type->break_ctl)
447 port->serial->type->break_ctl(tty, break_state);
448
449 return 0;
450 }
451
452 static int serial_proc_show(struct seq_file *m, void *v)
453 {
454 struct usb_serial *serial;
455 int i;
456 char tmp[40];
457
458 seq_puts(m, "usbserinfo:1.0 driver:2.0\n");
459 for (i = 0; i < SERIAL_TTY_MINORS; ++i) {
460 serial = usb_serial_get_by_index(i);
461 if (serial == NULL)
462 continue;
463
464 seq_printf(m, "%d:", i);
465 if (serial->type->driver.owner)
466 seq_printf(m, " module:%s",
467 module_name(serial->type->driver.owner));
468 seq_printf(m, " name:\"%s\"",
469 serial->type->description);
470 seq_printf(m, " vendor:%04x product:%04x",
471 le16_to_cpu(serial->dev->descriptor.idVendor),
472 le16_to_cpu(serial->dev->descriptor.idProduct));
473 seq_printf(m, " num_ports:%d", serial->num_ports);
474 seq_printf(m, " port:%d", i - serial->minor + 1);
475 usb_make_path(serial->dev, tmp, sizeof(tmp));
476 seq_printf(m, " path:%s", tmp);
477
478 seq_putc(m, '\n');
479 usb_serial_put(serial);
480 mutex_unlock(&serial->disc_mutex);
481 }
482 return 0;
483 }
484
485 static int serial_proc_open(struct inode *inode, struct file *file)
486 {
487 return single_open(file, serial_proc_show, NULL);
488 }
489
490 static const struct file_operations serial_proc_fops = {
491 .owner = THIS_MODULE,
492 .open = serial_proc_open,
493 .read = seq_read,
494 .llseek = seq_lseek,
495 .release = single_release,
496 };
497
498 static int serial_tiocmget(struct tty_struct *tty)
499 {
500 struct usb_serial_port *port = tty->driver_data;
501
502 dev_dbg(tty->dev, "%s\n", __func__);
503
504 if (port->serial->type->tiocmget)
505 return port->serial->type->tiocmget(tty);
506 return -EINVAL;
507 }
508
509 static int serial_tiocmset(struct tty_struct *tty,
510 unsigned int set, unsigned int clear)
511 {
512 struct usb_serial_port *port = tty->driver_data;
513
514 dev_dbg(tty->dev, "%s\n", __func__);
515
516 if (port->serial->type->tiocmset)
517 return port->serial->type->tiocmset(tty, set, clear);
518 return -EINVAL;
519 }
520
521 static int serial_get_icount(struct tty_struct *tty,
522 struct serial_icounter_struct *icount)
523 {
524 struct usb_serial_port *port = tty->driver_data;
525
526 dev_dbg(tty->dev, "%s\n", __func__);
527
528 if (port->serial->type->get_icount)
529 return port->serial->type->get_icount(tty, icount);
530 return -EINVAL;
531 }
532
533 /*
534 * We would be calling tty_wakeup here, but unfortunately some line
535 * disciplines have an annoying habit of calling tty->write from
536 * the write wakeup callback (e.g. n_hdlc.c).
537 */
538 void usb_serial_port_softint(struct usb_serial_port *port)
539 {
540 schedule_work(&port->work);
541 }
542 EXPORT_SYMBOL_GPL(usb_serial_port_softint);
543
544 static void usb_serial_port_work(struct work_struct *work)
545 {
546 struct usb_serial_port *port =
547 container_of(work, struct usb_serial_port, work);
548
549 tty_port_tty_wakeup(&port->port);
550 }
551
552 static void usb_serial_port_poison_urbs(struct usb_serial_port *port)
553 {
554 int i;
555
556 for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i)
557 usb_poison_urb(port->read_urbs[i]);
558 for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i)
559 usb_poison_urb(port->write_urbs[i]);
560
561 usb_poison_urb(port->interrupt_in_urb);
562 usb_poison_urb(port->interrupt_out_urb);
563 }
564
565 static void usb_serial_port_unpoison_urbs(struct usb_serial_port *port)
566 {
567 int i;
568
569 for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i)
570 usb_unpoison_urb(port->read_urbs[i]);
571 for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i)
572 usb_unpoison_urb(port->write_urbs[i]);
573
574 usb_unpoison_urb(port->interrupt_in_urb);
575 usb_unpoison_urb(port->interrupt_out_urb);
576 }
577
578 static void usb_serial_port_release(struct device *dev)
579 {
580 struct usb_serial_port *port = to_usb_serial_port(dev);
581 int i;
582
583 dev_dbg(dev, "%s\n", __func__);
584
585 usb_free_urb(port->interrupt_in_urb);
586 usb_free_urb(port->interrupt_out_urb);
587 for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) {
588 usb_free_urb(port->read_urbs[i]);
589 kfree(port->bulk_in_buffers[i]);
590 }
591 for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i) {
592 usb_free_urb(port->write_urbs[i]);
593 kfree(port->bulk_out_buffers[i]);
594 }
595 kfifo_free(&port->write_fifo);
596 kfree(port->interrupt_in_buffer);
597 kfree(port->interrupt_out_buffer);
598 tty_port_destroy(&port->port);
599 kfree(port);
600 }
601
602 static struct usb_serial *create_serial(struct usb_device *dev,
603 struct usb_interface *interface,
604 struct usb_serial_driver *driver)
605 {
606 struct usb_serial *serial;
607
608 serial = kzalloc(sizeof(*serial), GFP_KERNEL);
609 if (!serial)
610 return NULL;
611 serial->dev = usb_get_dev(dev);
612 serial->type = driver;
613 serial->interface = usb_get_intf(interface);
614 kref_init(&serial->kref);
615 mutex_init(&serial->disc_mutex);
616 serial->minor = SERIAL_TTY_NO_MINOR;
617
618 return serial;
619 }
620
621 static const struct usb_device_id *match_dynamic_id(struct usb_interface *intf,
622 struct usb_serial_driver *drv)
623 {
624 struct usb_dynid *dynid;
625
626 spin_lock(&drv->dynids.lock);
627 list_for_each_entry(dynid, &drv->dynids.list, node) {
628 if (usb_match_one_id(intf, &dynid->id)) {
629 spin_unlock(&drv->dynids.lock);
630 return &dynid->id;
631 }
632 }
633 spin_unlock(&drv->dynids.lock);
634 return NULL;
635 }
636
637 static const struct usb_device_id *get_iface_id(struct usb_serial_driver *drv,
638 struct usb_interface *intf)
639 {
640 const struct usb_device_id *id;
641
642 id = usb_match_id(intf, drv->id_table);
643 if (id) {
644 dev_dbg(&intf->dev, "static descriptor matches\n");
645 goto exit;
646 }
647 id = match_dynamic_id(intf, drv);
648 if (id)
649 dev_dbg(&intf->dev, "dynamic descriptor matches\n");
650 exit:
651 return id;
652 }
653
654 /* Caller must hold table_lock */
655 static struct usb_serial_driver *search_serial_device(
656 struct usb_interface *iface)
657 {
658 const struct usb_device_id *id = NULL;
659 struct usb_serial_driver *drv;
660 struct usb_driver *driver = to_usb_driver(iface->dev.driver);
661
662 /* Check if the usb id matches a known device */
663 list_for_each_entry(drv, &usb_serial_driver_list, driver_list) {
664 if (drv->usb_driver == driver)
665 id = get_iface_id(drv, iface);
666 if (id)
667 return drv;
668 }
669
670 return NULL;
671 }
672
673 static int serial_port_carrier_raised(struct tty_port *port)
674 {
675 struct usb_serial_port *p = container_of(port, struct usb_serial_port, port);
676 struct usb_serial_driver *drv = p->serial->type;
677
678 if (drv->carrier_raised)
679 return drv->carrier_raised(p);
680 /* No carrier control - don't block */
681 return 1;
682 }
683
684 static void serial_port_dtr_rts(struct tty_port *port, int on)
685 {
686 struct usb_serial_port *p = container_of(port, struct usb_serial_port, port);
687 struct usb_serial *serial = p->serial;
688 struct usb_serial_driver *drv = serial->type;
689
690 if (!drv->dtr_rts)
691 return;
692 /*
693 * Work-around bug in the tty-layer which can result in dtr_rts
694 * being called after a disconnect (and tty_unregister_device
695 * has returned). Remove once bug has been squashed.
696 */
697 mutex_lock(&serial->disc_mutex);
698 if (!serial->disconnected)
699 drv->dtr_rts(p, on);
700 mutex_unlock(&serial->disc_mutex);
701 }
702
703 static const struct tty_port_operations serial_port_ops = {
704 .carrier_raised = serial_port_carrier_raised,
705 .dtr_rts = serial_port_dtr_rts,
706 .activate = serial_port_activate,
707 .shutdown = serial_port_shutdown,
708 };
709
710 static int usb_serial_probe(struct usb_interface *interface,
711 const struct usb_device_id *id)
712 {
713 struct device *ddev = &interface->dev;
714 struct usb_device *dev = interface_to_usbdev(interface);
715 struct usb_serial *serial = NULL;
716 struct usb_serial_port *port;
717 struct usb_host_interface *iface_desc;
718 struct usb_endpoint_descriptor *endpoint;
719 struct usb_endpoint_descriptor *interrupt_in_endpoint[MAX_NUM_PORTS];
720 struct usb_endpoint_descriptor *interrupt_out_endpoint[MAX_NUM_PORTS];
721 struct usb_endpoint_descriptor *bulk_in_endpoint[MAX_NUM_PORTS];
722 struct usb_endpoint_descriptor *bulk_out_endpoint[MAX_NUM_PORTS];
723 struct usb_serial_driver *type = NULL;
724 int retval;
725 unsigned int minor;
726 int buffer_size;
727 int i;
728 int j;
729 int num_interrupt_in = 0;
730 int num_interrupt_out = 0;
731 int num_bulk_in = 0;
732 int num_bulk_out = 0;
733 int num_ports = 0;
734 int max_endpoints;
735
736 mutex_lock(&table_lock);
737 type = search_serial_device(interface);
738 if (!type) {
739 mutex_unlock(&table_lock);
740 dev_dbg(ddev, "none matched\n");
741 return -ENODEV;
742 }
743
744 if (!try_module_get(type->driver.owner)) {
745 mutex_unlock(&table_lock);
746 dev_err(ddev, "module get failed, exiting\n");
747 return -EIO;
748 }
749 mutex_unlock(&table_lock);
750
751 serial = create_serial(dev, interface, type);
752 if (!serial) {
753 module_put(type->driver.owner);
754 return -ENOMEM;
755 }
756
757 /* if this device type has a probe function, call it */
758 if (type->probe) {
759 const struct usb_device_id *id;
760
761 id = get_iface_id(type, interface);
762 retval = type->probe(serial, id);
763
764 if (retval) {
765 dev_dbg(ddev, "sub driver rejected device\n");
766 usb_serial_put(serial);
767 module_put(type->driver.owner);
768 return retval;
769 }
770 }
771
772 /* descriptor matches, let's find the endpoints needed */
773 /* check out the endpoints */
774 iface_desc = interface->cur_altsetting;
775 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
776 endpoint = &iface_desc->endpoint[i].desc;
777
778 if (usb_endpoint_is_bulk_in(endpoint)) {
779 /* we found a bulk in endpoint */
780 dev_dbg(ddev, "found bulk in on endpoint %d\n", i);
781 bulk_in_endpoint[num_bulk_in] = endpoint;
782 ++num_bulk_in;
783 }
784
785 if (usb_endpoint_is_bulk_out(endpoint)) {
786 /* we found a bulk out endpoint */
787 dev_dbg(ddev, "found bulk out on endpoint %d\n", i);
788 bulk_out_endpoint[num_bulk_out] = endpoint;
789 ++num_bulk_out;
790 }
791
792 if (usb_endpoint_is_int_in(endpoint)) {
793 /* we found a interrupt in endpoint */
794 dev_dbg(ddev, "found interrupt in on endpoint %d\n", i);
795 interrupt_in_endpoint[num_interrupt_in] = endpoint;
796 ++num_interrupt_in;
797 }
798
799 if (usb_endpoint_is_int_out(endpoint)) {
800 /* we found an interrupt out endpoint */
801 dev_dbg(ddev, "found interrupt out on endpoint %d\n", i);
802 interrupt_out_endpoint[num_interrupt_out] = endpoint;
803 ++num_interrupt_out;
804 }
805 }
806
807 #if defined(CONFIG_USB_SERIAL_PL2303) || defined(CONFIG_USB_SERIAL_PL2303_MODULE)
808 /* BEGIN HORRIBLE HACK FOR PL2303 */
809 /* this is needed due to the looney way its endpoints are set up */
810 if (((le16_to_cpu(dev->descriptor.idVendor) == PL2303_VENDOR_ID) &&
811 (le16_to_cpu(dev->descriptor.idProduct) == PL2303_PRODUCT_ID)) ||
812 ((le16_to_cpu(dev->descriptor.idVendor) == ATEN_VENDOR_ID) &&
813 (le16_to_cpu(dev->descriptor.idProduct) == ATEN_PRODUCT_ID)) ||
814 ((le16_to_cpu(dev->descriptor.idVendor) == ALCOR_VENDOR_ID) &&
815 (le16_to_cpu(dev->descriptor.idProduct) == ALCOR_PRODUCT_ID)) ||
816 ((le16_to_cpu(dev->descriptor.idVendor) == SIEMENS_VENDOR_ID) &&
817 (le16_to_cpu(dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_EF81))) {
818 if (interface != dev->actconfig->interface[0]) {
819 /* check out the endpoints of the other interface*/
820 iface_desc = dev->actconfig->interface[0]->cur_altsetting;
821 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
822 endpoint = &iface_desc->endpoint[i].desc;
823 if (usb_endpoint_is_int_in(endpoint)) {
824 /* we found a interrupt in endpoint */
825 dev_dbg(ddev, "found interrupt in for Prolific device on separate interface\n");
826 interrupt_in_endpoint[num_interrupt_in] = endpoint;
827 ++num_interrupt_in;
828 }
829 }
830 }
831
832 /* Now make sure the PL-2303 is configured correctly.
833 * If not, give up now and hope this hack will work
834 * properly during a later invocation of usb_serial_probe
835 */
836 if (num_bulk_in == 0 || num_bulk_out == 0) {
837 dev_info(ddev, "PL-2303 hack: descriptors matched but endpoints did not\n");
838 usb_serial_put(serial);
839 module_put(type->driver.owner);
840 return -ENODEV;
841 }
842 }
843 /* END HORRIBLE HACK FOR PL2303 */
844 #endif
845
846 #ifdef CONFIG_USB_SERIAL_GENERIC
847 if (type == &usb_serial_generic_device) {
848 num_ports = num_bulk_out;
849 if (num_ports == 0) {
850 dev_err(ddev, "Generic device with no bulk out, not allowed.\n");
851 usb_serial_put(serial);
852 module_put(type->driver.owner);
853 return -EIO;
854 }
855 dev_info(ddev, "The \"generic\" usb-serial driver is only for testing and one-off prototypes.\n");
856 dev_info(ddev, "Tell linux-usb@vger.kernel.org to add your device to a proper driver.\n");
857 }
858 #endif
859 if (!num_ports) {
860 /* if this device type has a calc_num_ports function, call it */
861 if (type->calc_num_ports)
862 num_ports = type->calc_num_ports(serial);
863 if (!num_ports)
864 num_ports = type->num_ports;
865 }
866
867 serial->num_ports = num_ports;
868 serial->num_bulk_in = num_bulk_in;
869 serial->num_bulk_out = num_bulk_out;
870 serial->num_interrupt_in = num_interrupt_in;
871 serial->num_interrupt_out = num_interrupt_out;
872
873 /* found all that we need */
874 dev_info(ddev, "%s converter detected\n", type->description);
875
876 /* create our ports, we need as many as the max endpoints */
877 /* we don't use num_ports here because some devices have more
878 endpoint pairs than ports */
879 max_endpoints = max(num_bulk_in, num_bulk_out);
880 max_endpoints = max(max_endpoints, num_interrupt_in);
881 max_endpoints = max(max_endpoints, num_interrupt_out);
882 max_endpoints = max(max_endpoints, (int)serial->num_ports);
883 serial->num_port_pointers = max_endpoints;
884
885 dev_dbg(ddev, "setting up %d port structures for this device", max_endpoints);
886 for (i = 0; i < max_endpoints; ++i) {
887 port = kzalloc(sizeof(struct usb_serial_port), GFP_KERNEL);
888 if (!port)
889 goto probe_error;
890 tty_port_init(&port->port);
891 port->port.ops = &serial_port_ops;
892 port->serial = serial;
893 spin_lock_init(&port->lock);
894 /* Keep this for private driver use for the moment but
895 should probably go away */
896 INIT_WORK(&port->work, usb_serial_port_work);
897 serial->port[i] = port;
898 port->dev.parent = &interface->dev;
899 port->dev.driver = NULL;
900 port->dev.bus = &usb_serial_bus_type;
901 port->dev.release = &usb_serial_port_release;
902 device_initialize(&port->dev);
903 }
904
905 /* set up the endpoint information */
906 for (i = 0; i < num_bulk_in; ++i) {
907 endpoint = bulk_in_endpoint[i];
908 port = serial->port[i];
909 buffer_size = max_t(int, serial->type->bulk_in_size,
910 usb_endpoint_maxp(endpoint));
911 port->bulk_in_size = buffer_size;
912 port->bulk_in_endpointAddress = endpoint->bEndpointAddress;
913
914 for (j = 0; j < ARRAY_SIZE(port->read_urbs); ++j) {
915 set_bit(j, &port->read_urbs_free);
916 port->read_urbs[j] = usb_alloc_urb(0, GFP_KERNEL);
917 if (!port->read_urbs[j])
918 goto probe_error;
919 port->bulk_in_buffers[j] = kmalloc(buffer_size,
920 GFP_KERNEL);
921 if (!port->bulk_in_buffers[j])
922 goto probe_error;
923 usb_fill_bulk_urb(port->read_urbs[j], dev,
924 usb_rcvbulkpipe(dev,
925 endpoint->bEndpointAddress),
926 port->bulk_in_buffers[j], buffer_size,
927 serial->type->read_bulk_callback,
928 port);
929 }
930
931 port->read_urb = port->read_urbs[0];
932 port->bulk_in_buffer = port->bulk_in_buffers[0];
933 }
934
935 for (i = 0; i < num_bulk_out; ++i) {
936 endpoint = bulk_out_endpoint[i];
937 port = serial->port[i];
938 if (kfifo_alloc(&port->write_fifo, PAGE_SIZE, GFP_KERNEL))
939 goto probe_error;
940 buffer_size = serial->type->bulk_out_size;
941 if (!buffer_size)
942 buffer_size = usb_endpoint_maxp(endpoint);
943 port->bulk_out_size = buffer_size;
944 port->bulk_out_endpointAddress = endpoint->bEndpointAddress;
945
946 for (j = 0; j < ARRAY_SIZE(port->write_urbs); ++j) {
947 set_bit(j, &port->write_urbs_free);
948 port->write_urbs[j] = usb_alloc_urb(0, GFP_KERNEL);
949 if (!port->write_urbs[j])
950 goto probe_error;
951 port->bulk_out_buffers[j] = kmalloc(buffer_size,
952 GFP_KERNEL);
953 if (!port->bulk_out_buffers[j])
954 goto probe_error;
955 usb_fill_bulk_urb(port->write_urbs[j], dev,
956 usb_sndbulkpipe(dev,
957 endpoint->bEndpointAddress),
958 port->bulk_out_buffers[j], buffer_size,
959 serial->type->write_bulk_callback,
960 port);
961 }
962
963 port->write_urb = port->write_urbs[0];
964 port->bulk_out_buffer = port->bulk_out_buffers[0];
965 }
966
967 if (serial->type->read_int_callback) {
968 for (i = 0; i < num_interrupt_in; ++i) {
969 endpoint = interrupt_in_endpoint[i];
970 port = serial->port[i];
971 port->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
972 if (!port->interrupt_in_urb)
973 goto probe_error;
974 buffer_size = usb_endpoint_maxp(endpoint);
975 port->interrupt_in_endpointAddress =
976 endpoint->bEndpointAddress;
977 port->interrupt_in_buffer = kmalloc(buffer_size,
978 GFP_KERNEL);
979 if (!port->interrupt_in_buffer)
980 goto probe_error;
981 usb_fill_int_urb(port->interrupt_in_urb, dev,
982 usb_rcvintpipe(dev,
983 endpoint->bEndpointAddress),
984 port->interrupt_in_buffer, buffer_size,
985 serial->type->read_int_callback, port,
986 endpoint->bInterval);
987 }
988 } else if (num_interrupt_in) {
989 dev_dbg(ddev, "The device claims to support interrupt in transfers, but read_int_callback is not defined\n");
990 }
991
992 if (serial->type->write_int_callback) {
993 for (i = 0; i < num_interrupt_out; ++i) {
994 endpoint = interrupt_out_endpoint[i];
995 port = serial->port[i];
996 port->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
997 if (!port->interrupt_out_urb)
998 goto probe_error;
999 buffer_size = usb_endpoint_maxp(endpoint);
1000 port->interrupt_out_size = buffer_size;
1001 port->interrupt_out_endpointAddress =
1002 endpoint->bEndpointAddress;
1003 port->interrupt_out_buffer = kmalloc(buffer_size,
1004 GFP_KERNEL);
1005 if (!port->interrupt_out_buffer)
1006 goto probe_error;
1007 usb_fill_int_urb(port->interrupt_out_urb, dev,
1008 usb_sndintpipe(dev,
1009 endpoint->bEndpointAddress),
1010 port->interrupt_out_buffer, buffer_size,
1011 serial->type->write_int_callback, port,
1012 endpoint->bInterval);
1013 }
1014 } else if (num_interrupt_out) {
1015 dev_dbg(ddev, "The device claims to support interrupt out transfers, but write_int_callback is not defined\n");
1016 }
1017
1018 usb_set_intfdata(interface, serial);
1019
1020 /* if this device type has an attach function, call it */
1021 if (type->attach) {
1022 retval = type->attach(serial);
1023 if (retval < 0)
1024 goto probe_error;
1025 serial->attached = 1;
1026 if (retval > 0) {
1027 /* quietly accept this device, but don't bind to a
1028 serial port as it's about to disappear */
1029 serial->num_ports = 0;
1030 goto exit;
1031 }
1032 } else {
1033 serial->attached = 1;
1034 }
1035
1036 /* Avoid race with tty_open and serial_install by setting the
1037 * disconnected flag and not clearing it until all ports have been
1038 * registered.
1039 */
1040 serial->disconnected = 1;
1041
1042 if (get_free_serial(serial, num_ports, &minor) == NULL) {
1043 dev_err(ddev, "No more free serial devices\n");
1044 goto probe_error;
1045 }
1046 serial->minor = minor;
1047
1048 /* register all of the individual ports with the driver core */
1049 for (i = 0; i < num_ports; ++i) {
1050 port = serial->port[i];
1051 dev_set_name(&port->dev, "ttyUSB%d", port->number);
1052 dev_dbg(ddev, "registering %s", dev_name(&port->dev));
1053 device_enable_async_suspend(&port->dev);
1054
1055 retval = device_add(&port->dev);
1056 if (retval)
1057 dev_err(ddev, "Error registering port device, continuing\n");
1058 }
1059
1060 serial->disconnected = 0;
1061
1062 usb_serial_console_init(minor);
1063 exit:
1064 module_put(type->driver.owner);
1065 return 0;
1066
1067 probe_error:
1068 usb_serial_put(serial);
1069 module_put(type->driver.owner);
1070 return -EIO;
1071 }
1072
1073 static void usb_serial_disconnect(struct usb_interface *interface)
1074 {
1075 int i;
1076 struct usb_serial *serial = usb_get_intfdata(interface);
1077 struct device *dev = &interface->dev;
1078 struct usb_serial_port *port;
1079
1080 usb_serial_console_disconnect(serial);
1081
1082 mutex_lock(&serial->disc_mutex);
1083 /* must set a flag, to signal subdrivers */
1084 serial->disconnected = 1;
1085 mutex_unlock(&serial->disc_mutex);
1086
1087 for (i = 0; i < serial->num_ports; ++i) {
1088 port = serial->port[i];
1089 if (port) {
1090 struct tty_struct *tty = tty_port_tty_get(&port->port);
1091 if (tty) {
1092 tty_vhangup(tty);
1093 tty_kref_put(tty);
1094 }
1095 usb_serial_port_poison_urbs(port);
1096 wake_up_interruptible(&port->port.delta_msr_wait);
1097 cancel_work_sync(&port->work);
1098 if (device_is_registered(&port->dev))
1099 device_del(&port->dev);
1100 }
1101 }
1102 if (serial->type->disconnect)
1103 serial->type->disconnect(serial);
1104
1105 /* let the last holder of this object cause it to be cleaned up */
1106 usb_serial_put(serial);
1107 dev_info(dev, "device disconnected\n");
1108 }
1109
1110 int usb_serial_suspend(struct usb_interface *intf, pm_message_t message)
1111 {
1112 struct usb_serial *serial = usb_get_intfdata(intf);
1113 struct usb_serial_port *port;
1114 int i, r = 0;
1115
1116 serial->suspending = 1;
1117
1118 /*
1119 * serial->type->suspend() MUST return 0 in system sleep context,
1120 * otherwise, the resume callback has to recover device from
1121 * previous suspend failure.
1122 */
1123 if (serial->type->suspend) {
1124 r = serial->type->suspend(serial, message);
1125 if (r < 0) {
1126 serial->suspending = 0;
1127 goto err_out;
1128 }
1129 }
1130
1131 for (i = 0; i < serial->num_ports; ++i) {
1132 port = serial->port[i];
1133 if (port)
1134 usb_serial_port_poison_urbs(port);
1135 }
1136
1137 err_out:
1138 return r;
1139 }
1140 EXPORT_SYMBOL(usb_serial_suspend);
1141
1142 static void usb_serial_unpoison_port_urbs(struct usb_serial *serial)
1143 {
1144 struct usb_serial_port *port;
1145 int i;
1146
1147 for (i = 0; i < serial->num_ports; ++i) {
1148 port = serial->port[i];
1149 if (port)
1150 usb_serial_port_unpoison_urbs(port);
1151 }
1152 }
1153
1154 int usb_serial_resume(struct usb_interface *intf)
1155 {
1156 struct usb_serial *serial = usb_get_intfdata(intf);
1157 int rv;
1158
1159 usb_serial_unpoison_port_urbs(serial);
1160
1161 serial->suspending = 0;
1162 if (serial->type->resume)
1163 rv = serial->type->resume(serial);
1164 else
1165 rv = usb_serial_generic_resume(serial);
1166
1167 return rv;
1168 }
1169 EXPORT_SYMBOL(usb_serial_resume);
1170
1171 static int usb_serial_reset_resume(struct usb_interface *intf)
1172 {
1173 struct usb_serial *serial = usb_get_intfdata(intf);
1174 int rv;
1175
1176 usb_serial_unpoison_port_urbs(serial);
1177
1178 serial->suspending = 0;
1179 if (serial->type->reset_resume)
1180 rv = serial->type->reset_resume(serial);
1181 else {
1182 rv = -EOPNOTSUPP;
1183 intf->needs_binding = 1;
1184 }
1185
1186 return rv;
1187 }
1188
1189 static const struct tty_operations serial_ops = {
1190 .open = serial_open,
1191 .close = serial_close,
1192 .write = serial_write,
1193 .hangup = serial_hangup,
1194 .write_room = serial_write_room,
1195 .ioctl = serial_ioctl,
1196 .set_termios = serial_set_termios,
1197 .throttle = serial_throttle,
1198 .unthrottle = serial_unthrottle,
1199 .break_ctl = serial_break,
1200 .chars_in_buffer = serial_chars_in_buffer,
1201 .wait_until_sent = serial_wait_until_sent,
1202 .tiocmget = serial_tiocmget,
1203 .tiocmset = serial_tiocmset,
1204 .get_icount = serial_get_icount,
1205 .cleanup = serial_cleanup,
1206 .install = serial_install,
1207 .proc_fops = &serial_proc_fops,
1208 };
1209
1210
1211 struct tty_driver *usb_serial_tty_driver;
1212
1213 /* Driver structure we register with the USB core */
1214 static struct usb_driver usb_serial_driver = {
1215 .name = "usbserial",
1216 .probe = usb_serial_probe,
1217 .disconnect = usb_serial_disconnect,
1218 .suspend = usb_serial_suspend,
1219 .resume = usb_serial_resume,
1220 .no_dynamic_id = 1,
1221 .supports_autosuspend = 1,
1222 };
1223
1224 static int __init usb_serial_init(void)
1225 {
1226 int i;
1227 int result;
1228
1229 usb_serial_tty_driver = alloc_tty_driver(SERIAL_TTY_MINORS);
1230 if (!usb_serial_tty_driver)
1231 return -ENOMEM;
1232
1233 /* Initialize our global data */
1234 for (i = 0; i < SERIAL_TTY_MINORS; ++i)
1235 serial_table[i] = NULL;
1236
1237 result = bus_register(&usb_serial_bus_type);
1238 if (result) {
1239 pr_err("%s - registering bus driver failed\n", __func__);
1240 goto exit_bus;
1241 }
1242
1243 usb_serial_tty_driver->driver_name = "usbserial";
1244 usb_serial_tty_driver->name = "ttyUSB";
1245 usb_serial_tty_driver->major = SERIAL_TTY_MAJOR;
1246 usb_serial_tty_driver->minor_start = 0;
1247 usb_serial_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
1248 usb_serial_tty_driver->subtype = SERIAL_TYPE_NORMAL;
1249 usb_serial_tty_driver->flags = TTY_DRIVER_REAL_RAW |
1250 TTY_DRIVER_DYNAMIC_DEV;
1251 usb_serial_tty_driver->init_termios = tty_std_termios;
1252 usb_serial_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD
1253 | HUPCL | CLOCAL;
1254 usb_serial_tty_driver->init_termios.c_ispeed = 9600;
1255 usb_serial_tty_driver->init_termios.c_ospeed = 9600;
1256 tty_set_operations(usb_serial_tty_driver, &serial_ops);
1257 result = tty_register_driver(usb_serial_tty_driver);
1258 if (result) {
1259 pr_err("%s - tty_register_driver failed\n", __func__);
1260 goto exit_reg_driver;
1261 }
1262
1263 /* register the USB driver */
1264 result = usb_register(&usb_serial_driver);
1265 if (result < 0) {
1266 pr_err("%s - usb_register failed\n", __func__);
1267 goto exit_tty;
1268 }
1269
1270 /* register the generic driver, if we should */
1271 result = usb_serial_generic_register();
1272 if (result < 0) {
1273 pr_err("%s - registering generic driver failed\n", __func__);
1274 goto exit_generic;
1275 }
1276
1277 return result;
1278
1279 exit_generic:
1280 usb_deregister(&usb_serial_driver);
1281
1282 exit_tty:
1283 tty_unregister_driver(usb_serial_tty_driver);
1284
1285 exit_reg_driver:
1286 bus_unregister(&usb_serial_bus_type);
1287
1288 exit_bus:
1289 pr_err("%s - returning with error %d\n", __func__, result);
1290 put_tty_driver(usb_serial_tty_driver);
1291 return result;
1292 }
1293
1294
1295 static void __exit usb_serial_exit(void)
1296 {
1297 usb_serial_console_exit();
1298
1299 usb_serial_generic_deregister();
1300
1301 usb_deregister(&usb_serial_driver);
1302 tty_unregister_driver(usb_serial_tty_driver);
1303 put_tty_driver(usb_serial_tty_driver);
1304 bus_unregister(&usb_serial_bus_type);
1305 }
1306
1307
1308 module_init(usb_serial_init);
1309 module_exit(usb_serial_exit);
1310
1311 #define set_to_generic_if_null(type, function) \
1312 do { \
1313 if (!type->function) { \
1314 type->function = usb_serial_generic_##function; \
1315 pr_debug("%s: using generic " #function "\n", \
1316 type->driver.name); \
1317 } \
1318 } while (0)
1319
1320 static void usb_serial_operations_init(struct usb_serial_driver *device)
1321 {
1322 set_to_generic_if_null(device, open);
1323 set_to_generic_if_null(device, write);
1324 set_to_generic_if_null(device, close);
1325 set_to_generic_if_null(device, write_room);
1326 set_to_generic_if_null(device, chars_in_buffer);
1327 if (device->tx_empty)
1328 set_to_generic_if_null(device, wait_until_sent);
1329 set_to_generic_if_null(device, read_bulk_callback);
1330 set_to_generic_if_null(device, write_bulk_callback);
1331 set_to_generic_if_null(device, process_read_urb);
1332 set_to_generic_if_null(device, prepare_write_buffer);
1333 }
1334
1335 static int usb_serial_register(struct usb_serial_driver *driver)
1336 {
1337 int retval;
1338
1339 if (usb_disabled())
1340 return -ENODEV;
1341
1342 if (!driver->description)
1343 driver->description = driver->driver.name;
1344 if (!driver->usb_driver) {
1345 WARN(1, "Serial driver %s has no usb_driver\n",
1346 driver->description);
1347 return -EINVAL;
1348 }
1349
1350 usb_serial_operations_init(driver);
1351
1352 /* Add this device to our list of devices */
1353 mutex_lock(&table_lock);
1354 list_add(&driver->driver_list, &usb_serial_driver_list);
1355
1356 retval = usb_serial_bus_register(driver);
1357 if (retval) {
1358 pr_err("problem %d when registering driver %s\n", retval, driver->description);
1359 list_del(&driver->driver_list);
1360 } else
1361 pr_info("USB Serial support registered for %s\n", driver->description);
1362
1363 mutex_unlock(&table_lock);
1364 return retval;
1365 }
1366
1367 static void usb_serial_deregister(struct usb_serial_driver *device)
1368 {
1369 pr_info("USB Serial deregistering driver %s\n", device->description);
1370 mutex_lock(&table_lock);
1371 list_del(&device->driver_list);
1372 usb_serial_bus_deregister(device);
1373 mutex_unlock(&table_lock);
1374 }
1375
1376 /**
1377 * usb_serial_register_drivers - register drivers for a usb-serial module
1378 * @serial_drivers: NULL-terminated array of pointers to drivers to be registered
1379 * @name: name of the usb_driver for this set of @serial_drivers
1380 * @id_table: list of all devices this @serial_drivers set binds to
1381 *
1382 * Registers all the drivers in the @serial_drivers array, and dynamically
1383 * creates a struct usb_driver with the name @name and id_table of @id_table.
1384 */
1385 int usb_serial_register_drivers(struct usb_serial_driver *const serial_drivers[],
1386 const char *name,
1387 const struct usb_device_id *id_table)
1388 {
1389 int rc;
1390 struct usb_driver *udriver;
1391 struct usb_serial_driver * const *sd;
1392
1393 /*
1394 * udriver must be registered before any of the serial drivers,
1395 * because the store_new_id() routine for the serial drivers (in
1396 * bus.c) probes udriver.
1397 *
1398 * Performance hack: We don't want udriver to be probed until
1399 * the serial drivers are registered, because the probe would
1400 * simply fail for lack of a matching serial driver.
1401 * So we leave udriver's id_table set to NULL until we are all set.
1402 *
1403 * Suspend/resume support is implemented in the usb-serial core,
1404 * so fill in the PM-related fields in udriver.
1405 */
1406 udriver = kzalloc(sizeof(*udriver), GFP_KERNEL);
1407 if (!udriver)
1408 return -ENOMEM;
1409
1410 udriver->name = name;
1411 udriver->no_dynamic_id = 1;
1412 udriver->supports_autosuspend = 1;
1413 udriver->suspend = usb_serial_suspend;
1414 udriver->resume = usb_serial_resume;
1415 udriver->probe = usb_serial_probe;
1416 udriver->disconnect = usb_serial_disconnect;
1417
1418 /* we only set the reset_resume field if the serial_driver has one */
1419 for (sd = serial_drivers; *sd; ++sd) {
1420 if ((*sd)->reset_resume) {
1421 udriver->reset_resume = usb_serial_reset_resume;
1422 break;
1423 }
1424 }
1425
1426 rc = usb_register(udriver);
1427 if (rc)
1428 return rc;
1429
1430 for (sd = serial_drivers; *sd; ++sd) {
1431 (*sd)->usb_driver = udriver;
1432 rc = usb_serial_register(*sd);
1433 if (rc)
1434 goto failed;
1435 }
1436
1437 /* Now set udriver's id_table and look for matches */
1438 udriver->id_table = id_table;
1439 rc = driver_attach(&udriver->drvwrap.driver);
1440 return 0;
1441
1442 failed:
1443 while (sd-- > serial_drivers)
1444 usb_serial_deregister(*sd);
1445 usb_deregister(udriver);
1446 return rc;
1447 }
1448 EXPORT_SYMBOL_GPL(usb_serial_register_drivers);
1449
1450 /**
1451 * usb_serial_deregister_drivers - deregister drivers for a usb-serial module
1452 * @serial_drivers: NULL-terminated array of pointers to drivers to be deregistered
1453 *
1454 * Deregisters all the drivers in the @serial_drivers array and deregisters and
1455 * frees the struct usb_driver that was created by the call to
1456 * usb_serial_register_drivers().
1457 */
1458 void usb_serial_deregister_drivers(struct usb_serial_driver *const serial_drivers[])
1459 {
1460 struct usb_driver *udriver = (*serial_drivers)->usb_driver;
1461
1462 for (; *serial_drivers; ++serial_drivers)
1463 usb_serial_deregister(*serial_drivers);
1464 usb_deregister(udriver);
1465 kfree(udriver);
1466 }
1467 EXPORT_SYMBOL_GPL(usb_serial_deregister_drivers);
1468
1469 MODULE_AUTHOR(DRIVER_AUTHOR);
1470 MODULE_DESCRIPTION(DRIVER_DESC);
1471 MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)