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inet: frag: enforce memory limits earlier
[linux/fpc-iii.git] / drivers / usb / serial / usb-serial.c
blob4a037b4a79cf3168cb45d60d1b6488ac21681570
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 <linux/idr.h>
41 #include "pl2303.h"
42
43 #define DRIVER_AUTHOR "Greg Kroah-Hartman <gregkh@linuxfoundation.org>"
44 #define DRIVER_DESC "USB Serial Driver core"
45
46 #define USB_SERIAL_TTY_MAJOR 188
47 #define USB_SERIAL_TTY_MINORS 512 /* should be enough for a while */
48
49 /* There is no MODULE_DEVICE_TABLE for usbserial.c. Instead
50 the MODULE_DEVICE_TABLE declarations in each serial driver
51 cause the "hotplug" program to pull in whatever module is necessary
52 via modprobe, and modprobe will load usbserial because the serial
53 drivers depend on it.
54 */
55
56 static DEFINE_IDR(serial_minors);
57 static DEFINE_MUTEX(table_lock);
58 static LIST_HEAD(usb_serial_driver_list);
59
60 /*
61 * Look up the serial port structure. If it is found and it hasn't been
62 * disconnected, return with the parent usb_serial structure's disc_mutex held
63 * and its refcount incremented. Otherwise return NULL.
64 */
65 struct usb_serial_port *usb_serial_port_get_by_minor(unsigned minor)
66 {
67 struct usb_serial *serial;
68 struct usb_serial_port *port;
69
70 mutex_lock(&table_lock);
71 port = idr_find(&serial_minors, minor);
72 if (!port)
73 goto exit;
74
75 serial = port->serial;
76 mutex_lock(&serial->disc_mutex);
77 if (serial->disconnected) {
78 mutex_unlock(&serial->disc_mutex);
79 port = NULL;
80 } else {
81 kref_get(&serial->kref);
82 }
83 exit:
84 mutex_unlock(&table_lock);
85 return port;
86 }
87
88 static int allocate_minors(struct usb_serial *serial, int num_ports)
89 {
90 struct usb_serial_port *port;
91 unsigned int i, j;
92 int minor;
93
94 dev_dbg(&serial->interface->dev, "%s %d\n", __func__, num_ports);
95
96 mutex_lock(&table_lock);
97 for (i = 0; i < num_ports; ++i) {
98 port = serial->port[i];
99 minor = idr_alloc(&serial_minors, port, 0,
100 USB_SERIAL_TTY_MINORS, GFP_KERNEL);
101 if (minor < 0)
102 goto error;
103 port->minor = minor;
104 port->port_number = i;
105 }
106 serial->minors_reserved = 1;
107 mutex_unlock(&table_lock);
108 return 0;
109 error:
110 /* unwind the already allocated minors */
111 for (j = 0; j < i; ++j)
112 idr_remove(&serial_minors, serial->port[j]->minor);
113 mutex_unlock(&table_lock);
114 return minor;
115 }
116
117 static void release_minors(struct usb_serial *serial)
118 {
119 int i;
120
121 mutex_lock(&table_lock);
122 for (i = 0; i < serial->num_ports; ++i)
123 idr_remove(&serial_minors, serial->port[i]->minor);
124 mutex_unlock(&table_lock);
125 serial->minors_reserved = 0;
126 }
127
128 static void destroy_serial(struct kref *kref)
129 {
130 struct usb_serial *serial;
131 struct usb_serial_port *port;
132 int i;
133
134 serial = to_usb_serial(kref);
135
136 /* return the minor range that this device had */
137 if (serial->minors_reserved)
138 release_minors(serial);
139
140 if (serial->attached && serial->type->release)
141 serial->type->release(serial);
142
143 /* Now that nothing is using the ports, they can be freed */
144 for (i = 0; i < serial->num_port_pointers; ++i) {
145 port = serial->port[i];
146 if (port) {
147 port->serial = NULL;
148 put_device(&port->dev);
149 }
150 }
151
152 usb_put_intf(serial->interface);
153 usb_put_dev(serial->dev);
154 kfree(serial);
155 }
156
157 void usb_serial_put(struct usb_serial *serial)
158 {
159 kref_put(&serial->kref, destroy_serial);
160 }
161
162 /*****************************************************************************
163 * Driver tty interface functions
164 *****************************************************************************/
165
166 /**
167 * serial_install - install tty
168 * @driver: the driver (USB in our case)
169 * @tty: the tty being created
170 *
171 * Create the termios objects for this tty. We use the default
172 * USB serial settings but permit them to be overridden by
173 * serial->type->init_termios.
174 *
175 * This is the first place a new tty gets used. Hence this is where we
176 * acquire references to the usb_serial structure and the driver module,
177 * where we store a pointer to the port, and where we do an autoresume.
178 * All these actions are reversed in serial_cleanup().
179 */
180 static int serial_install(struct tty_driver *driver, struct tty_struct *tty)
181 {
182 int idx = tty->index;
183 struct usb_serial *serial;
184 struct usb_serial_port *port;
185 int retval = -ENODEV;
186
187 port = usb_serial_port_get_by_minor(idx);
188 if (!port)
189 return retval;
190
191 serial = port->serial;
192 if (!try_module_get(serial->type->driver.owner))
193 goto error_module_get;
194
195 retval = usb_autopm_get_interface(serial->interface);
196 if (retval)
197 goto error_get_interface;
198
199 retval = tty_port_install(&port->port, driver, tty);
200 if (retval)
201 goto error_init_termios;
202
203 mutex_unlock(&serial->disc_mutex);
204
205 /* allow the driver to update the settings */
206 if (serial->type->init_termios)
207 serial->type->init_termios(tty);
208
209 tty->driver_data = port;
210
211 return retval;
212
213 error_init_termios:
214 usb_autopm_put_interface(serial->interface);
215 error_get_interface:
216 module_put(serial->type->driver.owner);
217 error_module_get:
218 usb_serial_put(serial);
219 mutex_unlock(&serial->disc_mutex);
220 return retval;
221 }
222
223 static int serial_port_activate(struct tty_port *tport, struct tty_struct *tty)
224 {
225 struct usb_serial_port *port =
226 container_of(tport, struct usb_serial_port, port);
227 struct usb_serial *serial = port->serial;
228 int retval;
229
230 mutex_lock(&serial->disc_mutex);
231 if (serial->disconnected)
232 retval = -ENODEV;
233 else
234 retval = port->serial->type->open(tty, port);
235 mutex_unlock(&serial->disc_mutex);
236
237 if (retval < 0)
238 retval = usb_translate_errors(retval);
239
240 return retval;
241 }
242
243 static int serial_open(struct tty_struct *tty, struct file *filp)
244 {
245 struct usb_serial_port *port = tty->driver_data;
246
247 dev_dbg(tty->dev, "%s\n", __func__);
248
249 return tty_port_open(&port->port, tty, filp);
250 }
251
252 /**
253 * serial_port_shutdown - shut down hardware
254 * @tport: tty port to shut down
255 *
256 * Shut down a USB serial port. Serialized against activate by the
257 * tport mutex and kept to matching open/close pairs
258 * of calls by the initialized flag.
259 *
260 * Not called if tty is console.
261 */
262 static void serial_port_shutdown(struct tty_port *tport)
263 {
264 struct usb_serial_port *port =
265 container_of(tport, struct usb_serial_port, port);
266 struct usb_serial_driver *drv = port->serial->type;
267
268 if (drv->close)
269 drv->close(port);
270 }
271
272 static void serial_hangup(struct tty_struct *tty)
273 {
274 struct usb_serial_port *port = tty->driver_data;
275
276 dev_dbg(tty->dev, "%s\n", __func__);
277
278 tty_port_hangup(&port->port);
279 }
280
281 static void serial_close(struct tty_struct *tty, struct file *filp)
282 {
283 struct usb_serial_port *port = tty->driver_data;
284
285 dev_dbg(tty->dev, "%s\n", __func__);
286
287 tty_port_close(&port->port, tty, filp);
288 }
289
290 /**
291 * serial_cleanup - free resources post close/hangup
292 * @port: port to free up
293 *
294 * Do the resource freeing and refcount dropping for the port.
295 * Avoid freeing the console.
296 *
297 * Called asynchronously after the last tty kref is dropped.
298 */
299 static void serial_cleanup(struct tty_struct *tty)
300 {
301 struct usb_serial_port *port = tty->driver_data;
302 struct usb_serial *serial;
303 struct module *owner;
304
305 dev_dbg(tty->dev, "%s\n", __func__);
306
307 /* The console is magical. Do not hang up the console hardware
308 * or there will be tears.
309 */
310 if (port->port.console)
311 return;
312
313 tty->driver_data = NULL;
314
315 serial = port->serial;
316 owner = serial->type->driver.owner;
317
318 mutex_lock(&serial->disc_mutex);
319 if (!serial->disconnected)
320 usb_autopm_put_interface(serial->interface);
321 mutex_unlock(&serial->disc_mutex);
322
323 usb_serial_put(serial);
324 module_put(owner);
325 }
326
327 static int serial_write(struct tty_struct *tty, const unsigned char *buf,
328 int count)
329 {
330 struct usb_serial_port *port = tty->driver_data;
331 int retval = -ENODEV;
332
333 if (port->serial->dev->state == USB_STATE_NOTATTACHED)
334 goto exit;
335
336 dev_dbg(tty->dev, "%s - %d byte(s)\n", __func__, count);
337
338 retval = port->serial->type->write(tty, port, buf, count);
339 if (retval < 0)
340 retval = usb_translate_errors(retval);
341 exit:
342 return retval;
343 }
344
345 static int serial_write_room(struct tty_struct *tty)
346 {
347 struct usb_serial_port *port = tty->driver_data;
348
349 dev_dbg(tty->dev, "%s\n", __func__);
350
351 return port->serial->type->write_room(tty);
352 }
353
354 static int serial_chars_in_buffer(struct tty_struct *tty)
355 {
356 struct usb_serial_port *port = tty->driver_data;
357 struct usb_serial *serial = port->serial;
358
359 dev_dbg(tty->dev, "%s\n", __func__);
360
361 if (serial->disconnected)
362 return 0;
363
364 return serial->type->chars_in_buffer(tty);
365 }
366
367 static void serial_wait_until_sent(struct tty_struct *tty, int timeout)
368 {
369 struct usb_serial_port *port = tty->driver_data;
370 struct usb_serial *serial = port->serial;
371
372 dev_dbg(tty->dev, "%s\n", __func__);
373
374 if (!port->serial->type->wait_until_sent)
375 return;
376
377 mutex_lock(&serial->disc_mutex);
378 if (!serial->disconnected)
379 port->serial->type->wait_until_sent(tty, timeout);
380 mutex_unlock(&serial->disc_mutex);
381 }
382
383 static void serial_throttle(struct tty_struct *tty)
384 {
385 struct usb_serial_port *port = tty->driver_data;
386
387 dev_dbg(tty->dev, "%s\n", __func__);
388
389 if (port->serial->type->throttle)
390 port->serial->type->throttle(tty);
391 }
392
393 static void serial_unthrottle(struct tty_struct *tty)
394 {
395 struct usb_serial_port *port = tty->driver_data;
396
397 dev_dbg(tty->dev, "%s\n", __func__);
398
399 if (port->serial->type->unthrottle)
400 port->serial->type->unthrottle(tty);
401 }
402
403 static int serial_ioctl(struct tty_struct *tty,
404 unsigned int cmd, unsigned long arg)
405 {
406 struct usb_serial_port *port = tty->driver_data;
407 int retval = -ENOIOCTLCMD;
408
409 dev_dbg(tty->dev, "%s - cmd 0x%04x\n", __func__, cmd);
410
411 switch (cmd) {
412 case TIOCMIWAIT:
413 if (port->serial->type->tiocmiwait)
414 retval = port->serial->type->tiocmiwait(tty, arg);
415 break;
416 default:
417 if (port->serial->type->ioctl)
418 retval = port->serial->type->ioctl(tty, cmd, arg);
419 }
420
421 return retval;
422 }
423
424 static void serial_set_termios(struct tty_struct *tty, struct ktermios *old)
425 {
426 struct usb_serial_port *port = tty->driver_data;
427
428 dev_dbg(tty->dev, "%s\n", __func__);
429
430 if (port->serial->type->set_termios)
431 port->serial->type->set_termios(tty, port, old);
432 else
433 tty_termios_copy_hw(&tty->termios, old);
434 }
435
436 static int serial_break(struct tty_struct *tty, int break_state)
437 {
438 struct usb_serial_port *port = tty->driver_data;
439
440 dev_dbg(tty->dev, "%s\n", __func__);
441
442 if (port->serial->type->break_ctl)
443 port->serial->type->break_ctl(tty, break_state);
444
445 return 0;
446 }
447
448 static int serial_proc_show(struct seq_file *m, void *v)
449 {
450 struct usb_serial *serial;
451 struct usb_serial_port *port;
452 int i;
453 char tmp[40];
454
455 seq_puts(m, "usbserinfo:1.0 driver:2.0\n");
456 for (i = 0; i < USB_SERIAL_TTY_MINORS; ++i) {
457 port = usb_serial_port_get_by_minor(i);
458 if (port == NULL)
459 continue;
460 serial = port->serial;
461
462 seq_printf(m, "%d:", i);
463 if (serial->type->driver.owner)
464 seq_printf(m, " module:%s",
465 module_name(serial->type->driver.owner));
466 seq_printf(m, " name:\"%s\"",
467 serial->type->description);
468 seq_printf(m, " vendor:%04x product:%04x",
469 le16_to_cpu(serial->dev->descriptor.idVendor),
470 le16_to_cpu(serial->dev->descriptor.idProduct));
471 seq_printf(m, " num_ports:%d", serial->num_ports);
472 seq_printf(m, " port:%d", port->port_number);
473 usb_make_path(serial->dev, tmp, sizeof(tmp));
474 seq_printf(m, " path:%s", tmp);
475
476 seq_putc(m, '\n');
477 usb_serial_put(serial);
478 mutex_unlock(&serial->disc_mutex);
479 }
480 return 0;
481 }
482
483 static int serial_proc_open(struct inode *inode, struct file *file)
484 {
485 return single_open(file, serial_proc_show, NULL);
486 }
487
488 static const struct file_operations serial_proc_fops = {
489 .owner = THIS_MODULE,
490 .open = serial_proc_open,
491 .read = seq_read,
492 .llseek = seq_lseek,
493 .release = single_release,
494 };
495
496 static int serial_tiocmget(struct tty_struct *tty)
497 {
498 struct usb_serial_port *port = tty->driver_data;
499
500 dev_dbg(tty->dev, "%s\n", __func__);
501
502 if (port->serial->type->tiocmget)
503 return port->serial->type->tiocmget(tty);
504 return -EINVAL;
505 }
506
507 static int serial_tiocmset(struct tty_struct *tty,
508 unsigned int set, unsigned int clear)
509 {
510 struct usb_serial_port *port = tty->driver_data;
511
512 dev_dbg(tty->dev, "%s\n", __func__);
513
514 if (port->serial->type->tiocmset)
515 return port->serial->type->tiocmset(tty, set, clear);
516 return -EINVAL;
517 }
518
519 static int serial_get_icount(struct tty_struct *tty,
520 struct serial_icounter_struct *icount)
521 {
522 struct usb_serial_port *port = tty->driver_data;
523
524 dev_dbg(tty->dev, "%s\n", __func__);
525
526 if (port->serial->type->get_icount)
527 return port->serial->type->get_icount(tty, icount);
528 return -EINVAL;
529 }
530
531 /*
532 * We would be calling tty_wakeup here, but unfortunately some line
533 * disciplines have an annoying habit of calling tty->write from
534 * the write wakeup callback (e.g. n_hdlc.c).
535 */
536 void usb_serial_port_softint(struct usb_serial_port *port)
537 {
538 schedule_work(&port->work);
539 }
540 EXPORT_SYMBOL_GPL(usb_serial_port_softint);
541
542 static void usb_serial_port_work(struct work_struct *work)
543 {
544 struct usb_serial_port *port =
545 container_of(work, struct usb_serial_port, work);
546
547 tty_port_tty_wakeup(&port->port);
548 }
549
550 static void usb_serial_port_poison_urbs(struct usb_serial_port *port)
551 {
552 int i;
553
554 for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i)
555 usb_poison_urb(port->read_urbs[i]);
556 for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i)
557 usb_poison_urb(port->write_urbs[i]);
558
559 usb_poison_urb(port->interrupt_in_urb);
560 usb_poison_urb(port->interrupt_out_urb);
561 }
562
563 static void usb_serial_port_unpoison_urbs(struct usb_serial_port *port)
564 {
565 int i;
566
567 for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i)
568 usb_unpoison_urb(port->read_urbs[i]);
569 for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i)
570 usb_unpoison_urb(port->write_urbs[i]);
571
572 usb_unpoison_urb(port->interrupt_in_urb);
573 usb_unpoison_urb(port->interrupt_out_urb);
574 }
575
576 static void usb_serial_port_release(struct device *dev)
577 {
578 struct usb_serial_port *port = to_usb_serial_port(dev);
579 int i;
580
581 dev_dbg(dev, "%s\n", __func__);
582
583 usb_free_urb(port->interrupt_in_urb);
584 usb_free_urb(port->interrupt_out_urb);
585 for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) {
586 usb_free_urb(port->read_urbs[i]);
587 kfree(port->bulk_in_buffers[i]);
588 }
589 for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i) {
590 usb_free_urb(port->write_urbs[i]);
591 kfree(port->bulk_out_buffers[i]);
592 }
593 kfifo_free(&port->write_fifo);
594 kfree(port->interrupt_in_buffer);
595 kfree(port->interrupt_out_buffer);
596 tty_port_destroy(&port->port);
597 kfree(port);
598 }
599
600 static struct usb_serial *create_serial(struct usb_device *dev,
601 struct usb_interface *interface,
602 struct usb_serial_driver *driver)
603 {
604 struct usb_serial *serial;
605
606 serial = kzalloc(sizeof(*serial), GFP_KERNEL);
607 if (!serial)
608 return NULL;
609 serial->dev = usb_get_dev(dev);
610 serial->type = driver;
611 serial->interface = usb_get_intf(interface);
612 kref_init(&serial->kref);
613 mutex_init(&serial->disc_mutex);
614 serial->minors_reserved = 0;
615
616 return serial;
617 }
618
619 static const struct usb_device_id *match_dynamic_id(struct usb_interface *intf,
620 struct usb_serial_driver *drv)
621 {
622 struct usb_dynid *dynid;
623
624 spin_lock(&drv->dynids.lock);
625 list_for_each_entry(dynid, &drv->dynids.list, node) {
626 if (usb_match_one_id(intf, &dynid->id)) {
627 spin_unlock(&drv->dynids.lock);
628 return &dynid->id;
629 }
630 }
631 spin_unlock(&drv->dynids.lock);
632 return NULL;
633 }
634
635 static const struct usb_device_id *get_iface_id(struct usb_serial_driver *drv,
636 struct usb_interface *intf)
637 {
638 const struct usb_device_id *id;
639
640 id = usb_match_id(intf, drv->id_table);
641 if (id) {
642 dev_dbg(&intf->dev, "static descriptor matches\n");
643 goto exit;
644 }
645 id = match_dynamic_id(intf, drv);
646 if (id)
647 dev_dbg(&intf->dev, "dynamic descriptor matches\n");
648 exit:
649 return id;
650 }
651
652 /* Caller must hold table_lock */
653 static struct usb_serial_driver *search_serial_device(
654 struct usb_interface *iface)
655 {
656 const struct usb_device_id *id = NULL;
657 struct usb_serial_driver *drv;
658 struct usb_driver *driver = to_usb_driver(iface->dev.driver);
659
660 /* Check if the usb id matches a known device */
661 list_for_each_entry(drv, &usb_serial_driver_list, driver_list) {
662 if (drv->usb_driver == driver)
663 id = get_iface_id(drv, iface);
664 if (id)
665 return drv;
666 }
667
668 return NULL;
669 }
670
671 static int serial_port_carrier_raised(struct tty_port *port)
672 {
673 struct usb_serial_port *p = container_of(port, struct usb_serial_port, port);
674 struct usb_serial_driver *drv = p->serial->type;
675
676 if (drv->carrier_raised)
677 return drv->carrier_raised(p);
678 /* No carrier control - don't block */
679 return 1;
680 }
681
682 static void serial_port_dtr_rts(struct tty_port *port, int on)
683 {
684 struct usb_serial_port *p = container_of(port, struct usb_serial_port, port);
685 struct usb_serial_driver *drv = p->serial->type;
686
687 if (drv->dtr_rts)
688 drv->dtr_rts(p, on);
689 }
690
691 static ssize_t port_number_show(struct device *dev,
692 struct device_attribute *attr, char *buf)
693 {
694 struct usb_serial_port *port = to_usb_serial_port(dev);
695
696 return sprintf(buf, "%u\n", port->port_number);
697 }
698 static DEVICE_ATTR_RO(port_number);
699
700 static struct attribute *usb_serial_port_attrs[] = {
701 &dev_attr_port_number.attr,
702 NULL
703 };
704 ATTRIBUTE_GROUPS(usb_serial_port);
705
706 static const struct tty_port_operations serial_port_ops = {
707 .carrier_raised = serial_port_carrier_raised,
708 .dtr_rts = serial_port_dtr_rts,
709 .activate = serial_port_activate,
710 .shutdown = serial_port_shutdown,
711 };
712
713 static int usb_serial_probe(struct usb_interface *interface,
714 const struct usb_device_id *id)
715 {
716 struct device *ddev = &interface->dev;
717 struct usb_device *dev = interface_to_usbdev(interface);
718 struct usb_serial *serial = NULL;
719 struct usb_serial_port *port;
720 struct usb_host_interface *iface_desc;
721 struct usb_endpoint_descriptor *endpoint;
722 struct usb_endpoint_descriptor *interrupt_in_endpoint[MAX_NUM_PORTS];
723 struct usb_endpoint_descriptor *interrupt_out_endpoint[MAX_NUM_PORTS];
724 struct usb_endpoint_descriptor *bulk_in_endpoint[MAX_NUM_PORTS];
725 struct usb_endpoint_descriptor *bulk_out_endpoint[MAX_NUM_PORTS];
726 struct usb_serial_driver *type = NULL;
727 int retval;
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 if (num_bulk_in < MAX_NUM_PORTS) {
784 bulk_in_endpoint[num_bulk_in] = endpoint;
785 ++num_bulk_in;
786 }
787 }
788
789 if (usb_endpoint_is_bulk_out(endpoint)) {
790 /* we found a bulk out endpoint */
791 dev_dbg(ddev, "found bulk out on endpoint %d\n", i);
792 if (num_bulk_out < MAX_NUM_PORTS) {
793 bulk_out_endpoint[num_bulk_out] = endpoint;
794 ++num_bulk_out;
795 }
796 }
797
798 if (usb_endpoint_is_int_in(endpoint)) {
799 /* we found a interrupt in endpoint */
800 dev_dbg(ddev, "found interrupt in on endpoint %d\n", i);
801 if (num_interrupt_in < MAX_NUM_PORTS) {
802 interrupt_in_endpoint[num_interrupt_in] =
803 endpoint;
804 ++num_interrupt_in;
805 }
806 }
807
808 if (usb_endpoint_is_int_out(endpoint)) {
809 /* we found an interrupt out endpoint */
810 dev_dbg(ddev, "found interrupt out on endpoint %d\n", i);
811 if (num_interrupt_out < MAX_NUM_PORTS) {
812 interrupt_out_endpoint[num_interrupt_out] =
813 endpoint;
814 ++num_interrupt_out;
815 }
816 }
817 }
818
819 #if IS_ENABLED(CONFIG_USB_SERIAL_PL2303)
820 /* BEGIN HORRIBLE HACK FOR PL2303 */
821 /* this is needed due to the looney way its endpoints are set up */
822 if (((le16_to_cpu(dev->descriptor.idVendor) == PL2303_VENDOR_ID) &&
823 (le16_to_cpu(dev->descriptor.idProduct) == PL2303_PRODUCT_ID)) ||
824 ((le16_to_cpu(dev->descriptor.idVendor) == ATEN_VENDOR_ID) &&
825 (le16_to_cpu(dev->descriptor.idProduct) == ATEN_PRODUCT_ID)) ||
826 ((le16_to_cpu(dev->descriptor.idVendor) == ALCOR_VENDOR_ID) &&
827 (le16_to_cpu(dev->descriptor.idProduct) == ALCOR_PRODUCT_ID)) ||
828 ((le16_to_cpu(dev->descriptor.idVendor) == SIEMENS_VENDOR_ID) &&
829 (le16_to_cpu(dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_EF81))) {
830 if (interface != dev->actconfig->interface[0]) {
831 /* check out the endpoints of the other interface*/
832 iface_desc = dev->actconfig->interface[0]->cur_altsetting;
833 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
834 endpoint = &iface_desc->endpoint[i].desc;
835 if (usb_endpoint_is_int_in(endpoint)) {
836 /* we found a interrupt in endpoint */
837 dev_dbg(ddev, "found interrupt in for Prolific device on separate interface\n");
838 if (num_interrupt_in < MAX_NUM_PORTS) {
839 interrupt_in_endpoint[num_interrupt_in] = endpoint;
840 ++num_interrupt_in;
841 }
842 }
843 }
844 }
845
846 /* Now make sure the PL-2303 is configured correctly.
847 * If not, give up now and hope this hack will work
848 * properly during a later invocation of usb_serial_probe
849 */
850 if (num_bulk_in == 0 || num_bulk_out == 0) {
851 dev_info(ddev, "PL-2303 hack: descriptors matched but endpoints did not\n");
852 usb_serial_put(serial);
853 module_put(type->driver.owner);
854 return -ENODEV;
855 }
856 }
857 /* END HORRIBLE HACK FOR PL2303 */
858 #endif
859
860 #ifdef CONFIG_USB_SERIAL_GENERIC
861 if (type == &usb_serial_generic_device) {
862 num_ports = num_bulk_out;
863 if (num_ports == 0) {
864 dev_err(ddev, "Generic device with no bulk out, not allowed.\n");
865 usb_serial_put(serial);
866 module_put(type->driver.owner);
867 return -EIO;
868 }
869 dev_info(ddev, "The \"generic\" usb-serial driver is only for testing and one-off prototypes.\n");
870 dev_info(ddev, "Tell linux-usb@vger.kernel.org to add your device to a proper driver.\n");
871 }
872 #endif
873 if (!num_ports) {
874 /* if this device type has a calc_num_ports function, call it */
875 if (type->calc_num_ports)
876 num_ports = type->calc_num_ports(serial);
877 if (!num_ports)
878 num_ports = type->num_ports;
879 }
880
881 if (num_ports > MAX_NUM_PORTS) {
882 dev_warn(ddev, "too many ports requested: %d\n", num_ports);
883 num_ports = MAX_NUM_PORTS;
884 }
885
886 serial->num_ports = num_ports;
887 serial->num_bulk_in = num_bulk_in;
888 serial->num_bulk_out = num_bulk_out;
889 serial->num_interrupt_in = num_interrupt_in;
890 serial->num_interrupt_out = num_interrupt_out;
891
892 /* found all that we need */
893 dev_info(ddev, "%s converter detected\n", type->description);
894
895 /* create our ports, we need as many as the max endpoints */
896 /* we don't use num_ports here because some devices have more
897 endpoint pairs than ports */
898 max_endpoints = max(num_bulk_in, num_bulk_out);
899 max_endpoints = max(max_endpoints, num_interrupt_in);
900 max_endpoints = max(max_endpoints, num_interrupt_out);
901 max_endpoints = max(max_endpoints, (int)serial->num_ports);
902 serial->num_port_pointers = max_endpoints;
903
904 dev_dbg(ddev, "setting up %d port structure(s)\n", max_endpoints);
905 for (i = 0; i < max_endpoints; ++i) {
906 port = kzalloc(sizeof(struct usb_serial_port), GFP_KERNEL);
907 if (!port)
908 goto probe_error;
909 tty_port_init(&port->port);
910 port->port.ops = &serial_port_ops;
911 port->serial = serial;
912 spin_lock_init(&port->lock);
913 /* Keep this for private driver use for the moment but
914 should probably go away */
915 INIT_WORK(&port->work, usb_serial_port_work);
916 serial->port[i] = port;
917 port->dev.parent = &interface->dev;
918 port->dev.driver = NULL;
919 port->dev.bus = &usb_serial_bus_type;
920 port->dev.release = &usb_serial_port_release;
921 port->dev.groups = usb_serial_port_groups;
922 device_initialize(&port->dev);
923 }
924
925 /* set up the endpoint information */
926 for (i = 0; i < num_bulk_in; ++i) {
927 endpoint = bulk_in_endpoint[i];
928 port = serial->port[i];
929 buffer_size = max_t(int, serial->type->bulk_in_size,
930 usb_endpoint_maxp(endpoint));
931 port->bulk_in_size = buffer_size;
932 port->bulk_in_endpointAddress = endpoint->bEndpointAddress;
933
934 for (j = 0; j < ARRAY_SIZE(port->read_urbs); ++j) {
935 set_bit(j, &port->read_urbs_free);
936 port->read_urbs[j] = usb_alloc_urb(0, GFP_KERNEL);
937 if (!port->read_urbs[j])
938 goto probe_error;
939 port->bulk_in_buffers[j] = kmalloc(buffer_size,
940 GFP_KERNEL);
941 if (!port->bulk_in_buffers[j])
942 goto probe_error;
943 usb_fill_bulk_urb(port->read_urbs[j], dev,
944 usb_rcvbulkpipe(dev,
945 endpoint->bEndpointAddress),
946 port->bulk_in_buffers[j], buffer_size,
947 serial->type->read_bulk_callback,
948 port);
949 }
950
951 port->read_urb = port->read_urbs[0];
952 port->bulk_in_buffer = port->bulk_in_buffers[0];
953 }
954
955 for (i = 0; i < num_bulk_out; ++i) {
956 endpoint = bulk_out_endpoint[i];
957 port = serial->port[i];
958 if (kfifo_alloc(&port->write_fifo, PAGE_SIZE, GFP_KERNEL))
959 goto probe_error;
960 buffer_size = serial->type->bulk_out_size;
961 if (!buffer_size)
962 buffer_size = usb_endpoint_maxp(endpoint);
963 port->bulk_out_size = buffer_size;
964 port->bulk_out_endpointAddress = endpoint->bEndpointAddress;
965
966 for (j = 0; j < ARRAY_SIZE(port->write_urbs); ++j) {
967 set_bit(j, &port->write_urbs_free);
968 port->write_urbs[j] = usb_alloc_urb(0, GFP_KERNEL);
969 if (!port->write_urbs[j])
970 goto probe_error;
971 port->bulk_out_buffers[j] = kmalloc(buffer_size,
972 GFP_KERNEL);
973 if (!port->bulk_out_buffers[j])
974 goto probe_error;
975 usb_fill_bulk_urb(port->write_urbs[j], dev,
976 usb_sndbulkpipe(dev,
977 endpoint->bEndpointAddress),
978 port->bulk_out_buffers[j], buffer_size,
979 serial->type->write_bulk_callback,
980 port);
981 }
982
983 port->write_urb = port->write_urbs[0];
984 port->bulk_out_buffer = port->bulk_out_buffers[0];
985 }
986
987 if (serial->type->read_int_callback) {
988 for (i = 0; i < num_interrupt_in; ++i) {
989 endpoint = interrupt_in_endpoint[i];
990 port = serial->port[i];
991 port->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
992 if (!port->interrupt_in_urb)
993 goto probe_error;
994 buffer_size = usb_endpoint_maxp(endpoint);
995 port->interrupt_in_endpointAddress =
996 endpoint->bEndpointAddress;
997 port->interrupt_in_buffer = kmalloc(buffer_size,
998 GFP_KERNEL);
999 if (!port->interrupt_in_buffer)
1000 goto probe_error;
1001 usb_fill_int_urb(port->interrupt_in_urb, dev,
1002 usb_rcvintpipe(dev,
1003 endpoint->bEndpointAddress),
1004 port->interrupt_in_buffer, buffer_size,
1005 serial->type->read_int_callback, port,
1006 endpoint->bInterval);
1007 }
1008 } else if (num_interrupt_in) {
1009 dev_dbg(ddev, "The device claims to support interrupt in transfers, but read_int_callback is not defined\n");
1010 }
1011
1012 if (serial->type->write_int_callback) {
1013 for (i = 0; i < num_interrupt_out; ++i) {
1014 endpoint = interrupt_out_endpoint[i];
1015 port = serial->port[i];
1016 port->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
1017 if (!port->interrupt_out_urb)
1018 goto probe_error;
1019 buffer_size = usb_endpoint_maxp(endpoint);
1020 port->interrupt_out_size = buffer_size;
1021 port->interrupt_out_endpointAddress =
1022 endpoint->bEndpointAddress;
1023 port->interrupt_out_buffer = kmalloc(buffer_size,
1024 GFP_KERNEL);
1025 if (!port->interrupt_out_buffer)
1026 goto probe_error;
1027 usb_fill_int_urb(port->interrupt_out_urb, dev,
1028 usb_sndintpipe(dev,
1029 endpoint->bEndpointAddress),
1030 port->interrupt_out_buffer, buffer_size,
1031 serial->type->write_int_callback, port,
1032 endpoint->bInterval);
1033 }
1034 } else if (num_interrupt_out) {
1035 dev_dbg(ddev, "The device claims to support interrupt out transfers, but write_int_callback is not defined\n");
1036 }
1037
1038 usb_set_intfdata(interface, serial);
1039
1040 /* if this device type has an attach function, call it */
1041 if (type->attach) {
1042 retval = type->attach(serial);
1043 if (retval < 0)
1044 goto probe_error;
1045 serial->attached = 1;
1046 if (retval > 0) {
1047 /* quietly accept this device, but don't bind to a
1048 serial port as it's about to disappear */
1049 serial->num_ports = 0;
1050 goto exit;
1051 }
1052 } else {
1053 serial->attached = 1;
1054 }
1055
1056 /* Avoid race with tty_open and serial_install by setting the
1057 * disconnected flag and not clearing it until all ports have been
1058 * registered.
1059 */
1060 serial->disconnected = 1;
1061
1062 if (allocate_minors(serial, num_ports)) {
1063 dev_err(ddev, "No more free serial minor numbers\n");
1064 goto probe_error;
1065 }
1066
1067 /* register all of the individual ports with the driver core */
1068 for (i = 0; i < num_ports; ++i) {
1069 port = serial->port[i];
1070 dev_set_name(&port->dev, "ttyUSB%d", port->minor);
1071 dev_dbg(ddev, "registering %s\n", dev_name(&port->dev));
1072 device_enable_async_suspend(&port->dev);
1073
1074 retval = device_add(&port->dev);
1075 if (retval)
1076 dev_err(ddev, "Error registering port device, continuing\n");
1077 }
1078
1079 serial->disconnected = 0;
1080
1081 if (num_ports > 0)
1082 usb_serial_console_init(serial->port[0]->minor);
1083 exit:
1084 module_put(type->driver.owner);
1085 return 0;
1086
1087 probe_error:
1088 usb_serial_put(serial);
1089 module_put(type->driver.owner);
1090 return -EIO;
1091 }
1092
1093 static void usb_serial_disconnect(struct usb_interface *interface)
1094 {
1095 int i;
1096 struct usb_serial *serial = usb_get_intfdata(interface);
1097 struct device *dev = &interface->dev;
1098 struct usb_serial_port *port;
1099 struct tty_struct *tty;
1100
1101 usb_serial_console_disconnect(serial);
1102
1103 mutex_lock(&serial->disc_mutex);
1104 /* must set a flag, to signal subdrivers */
1105 serial->disconnected = 1;
1106 mutex_unlock(&serial->disc_mutex);
1107
1108 for (i = 0; i < serial->num_ports; ++i) {
1109 port = serial->port[i];
1110 tty = tty_port_tty_get(&port->port);
1111 if (tty) {
1112 tty_vhangup(tty);
1113 tty_kref_put(tty);
1114 }
1115 usb_serial_port_poison_urbs(port);
1116 wake_up_interruptible(&port->port.delta_msr_wait);
1117 cancel_work_sync(&port->work);
1118 if (device_is_registered(&port->dev))
1119 device_del(&port->dev);
1120 }
1121 if (serial->type->disconnect)
1122 serial->type->disconnect(serial);
1123
1124 /* let the last holder of this object cause it to be cleaned up */
1125 usb_serial_put(serial);
1126 dev_info(dev, "device disconnected\n");
1127 }
1128
1129 int usb_serial_suspend(struct usb_interface *intf, pm_message_t message)
1130 {
1131 struct usb_serial *serial = usb_get_intfdata(intf);
1132 int i, r = 0;
1133
1134 serial->suspending = 1;
1135
1136 /*
1137 * serial->type->suspend() MUST return 0 in system sleep context,
1138 * otherwise, the resume callback has to recover device from
1139 * previous suspend failure.
1140 */
1141 if (serial->type->suspend) {
1142 r = serial->type->suspend(serial, message);
1143 if (r < 0) {
1144 serial->suspending = 0;
1145 goto err_out;
1146 }
1147 }
1148
1149 for (i = 0; i < serial->num_ports; ++i)
1150 usb_serial_port_poison_urbs(serial->port[i]);
1151 err_out:
1152 return r;
1153 }
1154 EXPORT_SYMBOL(usb_serial_suspend);
1155
1156 static void usb_serial_unpoison_port_urbs(struct usb_serial *serial)
1157 {
1158 int i;
1159
1160 for (i = 0; i < serial->num_ports; ++i)
1161 usb_serial_port_unpoison_urbs(serial->port[i]);
1162 }
1163
1164 int usb_serial_resume(struct usb_interface *intf)
1165 {
1166 struct usb_serial *serial = usb_get_intfdata(intf);
1167 int rv;
1168
1169 usb_serial_unpoison_port_urbs(serial);
1170
1171 serial->suspending = 0;
1172 if (serial->type->resume)
1173 rv = serial->type->resume(serial);
1174 else
1175 rv = usb_serial_generic_resume(serial);
1176
1177 return rv;
1178 }
1179 EXPORT_SYMBOL(usb_serial_resume);
1180
1181 static int usb_serial_reset_resume(struct usb_interface *intf)
1182 {
1183 struct usb_serial *serial = usb_get_intfdata(intf);
1184 int rv;
1185
1186 usb_serial_unpoison_port_urbs(serial);
1187
1188 serial->suspending = 0;
1189 if (serial->type->reset_resume) {
1190 rv = serial->type->reset_resume(serial);
1191 } else {
1192 rv = -EOPNOTSUPP;
1193 intf->needs_binding = 1;
1194 }
1195
1196 return rv;
1197 }
1198
1199 static const struct tty_operations serial_ops = {
1200 .open = serial_open,
1201 .close = serial_close,
1202 .write = serial_write,
1203 .hangup = serial_hangup,
1204 .write_room = serial_write_room,
1205 .ioctl = serial_ioctl,
1206 .set_termios = serial_set_termios,
1207 .throttle = serial_throttle,
1208 .unthrottle = serial_unthrottle,
1209 .break_ctl = serial_break,
1210 .chars_in_buffer = serial_chars_in_buffer,
1211 .wait_until_sent = serial_wait_until_sent,
1212 .tiocmget = serial_tiocmget,
1213 .tiocmset = serial_tiocmset,
1214 .get_icount = serial_get_icount,
1215 .cleanup = serial_cleanup,
1216 .install = serial_install,
1217 .proc_fops = &serial_proc_fops,
1218 };
1219
1220
1221 struct tty_driver *usb_serial_tty_driver;
1222
1223 /* Driver structure we register with the USB core */
1224 static struct usb_driver usb_serial_driver = {
1225 .name = "usbserial",
1226 .probe = usb_serial_probe,
1227 .disconnect = usb_serial_disconnect,
1228 .suspend = usb_serial_suspend,
1229 .resume = usb_serial_resume,
1230 .no_dynamic_id = 1,
1231 .supports_autosuspend = 1,
1232 };
1233
1234 static int __init usb_serial_init(void)
1235 {
1236 int result;
1237
1238 usb_serial_tty_driver = alloc_tty_driver(USB_SERIAL_TTY_MINORS);
1239 if (!usb_serial_tty_driver)
1240 return -ENOMEM;
1241
1242 /* Initialize our global data */
1243 result = bus_register(&usb_serial_bus_type);
1244 if (result) {
1245 pr_err("%s - registering bus driver failed\n", __func__);
1246 goto exit_bus;
1247 }
1248
1249 usb_serial_tty_driver->driver_name = "usbserial";
1250 usb_serial_tty_driver->name = "ttyUSB";
1251 usb_serial_tty_driver->major = USB_SERIAL_TTY_MAJOR;
1252 usb_serial_tty_driver->minor_start = 0;
1253 usb_serial_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
1254 usb_serial_tty_driver->subtype = SERIAL_TYPE_NORMAL;
1255 usb_serial_tty_driver->flags = TTY_DRIVER_REAL_RAW |
1256 TTY_DRIVER_DYNAMIC_DEV;
1257 usb_serial_tty_driver->init_termios = tty_std_termios;
1258 usb_serial_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD
1259 | HUPCL | CLOCAL;
1260 usb_serial_tty_driver->init_termios.c_ispeed = 9600;
1261 usb_serial_tty_driver->init_termios.c_ospeed = 9600;
1262 tty_set_operations(usb_serial_tty_driver, &serial_ops);
1263 result = tty_register_driver(usb_serial_tty_driver);
1264 if (result) {
1265 pr_err("%s - tty_register_driver failed\n", __func__);
1266 goto exit_reg_driver;
1267 }
1268
1269 /* register the USB driver */
1270 result = usb_register(&usb_serial_driver);
1271 if (result < 0) {
1272 pr_err("%s - usb_register failed\n", __func__);
1273 goto exit_tty;
1274 }
1275
1276 /* register the generic driver, if we should */
1277 result = usb_serial_generic_register();
1278 if (result < 0) {
1279 pr_err("%s - registering generic driver failed\n", __func__);
1280 goto exit_generic;
1281 }
1282
1283 return result;
1284
1285 exit_generic:
1286 usb_deregister(&usb_serial_driver);
1287
1288 exit_tty:
1289 tty_unregister_driver(usb_serial_tty_driver);
1290
1291 exit_reg_driver:
1292 bus_unregister(&usb_serial_bus_type);
1293
1294 exit_bus:
1295 pr_err("%s - returning with error %d\n", __func__, result);
1296 put_tty_driver(usb_serial_tty_driver);
1297 return result;
1298 }
1299
1300
1301 static void __exit usb_serial_exit(void)
1302 {
1303 usb_serial_console_exit();
1304
1305 usb_serial_generic_deregister();
1306
1307 usb_deregister(&usb_serial_driver);
1308 tty_unregister_driver(usb_serial_tty_driver);
1309 put_tty_driver(usb_serial_tty_driver);
1310 bus_unregister(&usb_serial_bus_type);
1311 idr_destroy(&serial_minors);
1312 }
1313
1314
1315 module_init(usb_serial_init);
1316 module_exit(usb_serial_exit);
1317
1318 #define set_to_generic_if_null(type, function) \
1319 do { \
1320 if (!type->function) { \
1321 type->function = usb_serial_generic_##function; \
1322 pr_debug("%s: using generic " #function "\n", \
1323 type->driver.name); \
1324 } \
1325 } while (0)
1326
1327 static void usb_serial_operations_init(struct usb_serial_driver *device)
1328 {
1329 set_to_generic_if_null(device, open);
1330 set_to_generic_if_null(device, write);
1331 set_to_generic_if_null(device, close);
1332 set_to_generic_if_null(device, write_room);
1333 set_to_generic_if_null(device, chars_in_buffer);
1334 if (device->tx_empty)
1335 set_to_generic_if_null(device, wait_until_sent);
1336 set_to_generic_if_null(device, read_bulk_callback);
1337 set_to_generic_if_null(device, write_bulk_callback);
1338 set_to_generic_if_null(device, process_read_urb);
1339 set_to_generic_if_null(device, prepare_write_buffer);
1340 }
1341
1342 static int usb_serial_register(struct usb_serial_driver *driver)
1343 {
1344 int retval;
1345
1346 if (usb_disabled())
1347 return -ENODEV;
1348
1349 if (!driver->description)
1350 driver->description = driver->driver.name;
1351 if (!driver->usb_driver) {
1352 WARN(1, "Serial driver %s has no usb_driver\n",
1353 driver->description);
1354 return -EINVAL;
1355 }
1356
1357 usb_serial_operations_init(driver);
1358
1359 /* Add this device to our list of devices */
1360 mutex_lock(&table_lock);
1361 list_add(&driver->driver_list, &usb_serial_driver_list);
1362
1363 retval = usb_serial_bus_register(driver);
1364 if (retval) {
1365 pr_err("problem %d when registering driver %s\n", retval, driver->description);
1366 list_del(&driver->driver_list);
1367 } else {
1368 pr_info("USB Serial support registered for %s\n", driver->description);
1369 }
1370 mutex_unlock(&table_lock);
1371 return retval;
1372 }
1373
1374 static void usb_serial_deregister(struct usb_serial_driver *device)
1375 {
1376 pr_info("USB Serial deregistering driver %s\n", device->description);
1377
1378 mutex_lock(&table_lock);
1379 list_del(&device->driver_list);
1380 mutex_unlock(&table_lock);
1381
1382 usb_serial_bus_deregister(device);
1383 }
1384
1385 /**
1386 * usb_serial_register_drivers - register drivers for a usb-serial module
1387 * @serial_drivers: NULL-terminated array of pointers to drivers to be registered
1388 * @name: name of the usb_driver for this set of @serial_drivers
1389 * @id_table: list of all devices this @serial_drivers set binds to
1390 *
1391 * Registers all the drivers in the @serial_drivers array, and dynamically
1392 * creates a struct usb_driver with the name @name and id_table of @id_table.
1393 */
1394 int usb_serial_register_drivers(struct usb_serial_driver *const serial_drivers[],
1395 const char *name,
1396 const struct usb_device_id *id_table)
1397 {
1398 int rc;
1399 struct usb_driver *udriver;
1400 struct usb_serial_driver * const *sd;
1401
1402 /*
1403 * udriver must be registered before any of the serial drivers,
1404 * because the store_new_id() routine for the serial drivers (in
1405 * bus.c) probes udriver.
1406 *
1407 * Performance hack: We don't want udriver to be probed until
1408 * the serial drivers are registered, because the probe would
1409 * simply fail for lack of a matching serial driver.
1410 * So we leave udriver's id_table set to NULL until we are all set.
1411 *
1412 * Suspend/resume support is implemented in the usb-serial core,
1413 * so fill in the PM-related fields in udriver.
1414 */
1415 udriver = kzalloc(sizeof(*udriver), GFP_KERNEL);
1416 if (!udriver)
1417 return -ENOMEM;
1418
1419 udriver->name = name;
1420 udriver->no_dynamic_id = 1;
1421 udriver->supports_autosuspend = 1;
1422 udriver->suspend = usb_serial_suspend;
1423 udriver->resume = usb_serial_resume;
1424 udriver->probe = usb_serial_probe;
1425 udriver->disconnect = usb_serial_disconnect;
1426
1427 /* we only set the reset_resume field if the serial_driver has one */
1428 for (sd = serial_drivers; *sd; ++sd) {
1429 if ((*sd)->reset_resume) {
1430 udriver->reset_resume = usb_serial_reset_resume;
1431 break;
1432 }
1433 }
1434
1435 rc = usb_register(udriver);
1436 if (rc)
1437 goto failed_usb_register;
1438
1439 for (sd = serial_drivers; *sd; ++sd) {
1440 (*sd)->usb_driver = udriver;
1441 rc = usb_serial_register(*sd);
1442 if (rc)
1443 goto failed;
1444 }
1445
1446 /* Now set udriver's id_table and look for matches */
1447 udriver->id_table = id_table;
1448 rc = driver_attach(&udriver->drvwrap.driver);
1449 return 0;
1450
1451 failed:
1452 while (sd-- > serial_drivers)
1453 usb_serial_deregister(*sd);
1454 usb_deregister(udriver);
1455 failed_usb_register:
1456 kfree(udriver);
1457 return rc;
1458 }
1459 EXPORT_SYMBOL_GPL(usb_serial_register_drivers);
1460
1461 /**
1462 * usb_serial_deregister_drivers - deregister drivers for a usb-serial module
1463 * @serial_drivers: NULL-terminated array of pointers to drivers to be deregistered
1464 *
1465 * Deregisters all the drivers in the @serial_drivers array and deregisters and
1466 * frees the struct usb_driver that was created by the call to
1467 * usb_serial_register_drivers().
1468 */
1469 void usb_serial_deregister_drivers(struct usb_serial_driver *const serial_drivers[])
1470 {
1471 struct usb_driver *udriver = (*serial_drivers)->usb_driver;
1472
1473 for (; *serial_drivers; ++serial_drivers)
1474 usb_serial_deregister(*serial_drivers);
1475 usb_deregister(udriver);
1476 kfree(udriver);
1477 }
1478 EXPORT_SYMBOL_GPL(usb_serial_deregister_drivers);
1479
1480 MODULE_AUTHOR(DRIVER_AUTHOR);
1481 MODULE_DESCRIPTION(DRIVER_DESC);
1482 MODULE_LICENSE("GPL");
Linux with added FPC-III support