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USB: fix wrong order of events in usb serial suspension
[linux-2.6/linux-2.6-openrd.git] / drivers / usb / serial / usb-serial.c
blob45975b4984eabff36729c02d8ef877da1c6508ed
1 /*
2 * USB Serial Converter driver
3 *
4 * Copyright (C) 1999 - 2005 Greg Kroah-Hartman (greg@kroah.com)
5 * Copyright (C) 2000 Peter Berger (pberger@brimson.com)
6 * Copyright (C) 2000 Al Borchers (borchers@steinerpoint.com)
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License version
10 * 2 as published by the Free Software Foundation.
11 *
12 * This driver was originally based on the ACM driver by Armin Fuerst (which was
13 * based on a driver by Brad Keryan)
14 *
15 * See Documentation/usb/usb-serial.txt for more information on using this
16 * driver
17 *
18 */
19
20 #include <linux/kernel.h>
21 #include <linux/errno.h>
22 #include <linux/init.h>
23 #include <linux/slab.h>
24 #include <linux/smp_lock.h>
25 #include <linux/tty.h>
26 #include <linux/tty_driver.h>
27 #include <linux/tty_flip.h>
28 #include <linux/module.h>
29 #include <linux/moduleparam.h>
30 #include <linux/seq_file.h>
31 #include <linux/spinlock.h>
32 #include <linux/mutex.h>
33 #include <linux/list.h>
34 #include <linux/uaccess.h>
35 #include <linux/serial.h>
36 #include <linux/usb.h>
37 #include <linux/usb/serial.h>
38 #include "pl2303.h"
39
40 /*
41 * Version Information
42 */
43 #define DRIVER_AUTHOR "Greg Kroah-Hartman, greg@kroah.com, http://www.kroah.com/linux/"
44 #define DRIVER_DESC "USB Serial Driver core"
45
46 /* Driver structure we register with the USB core */
47 static struct usb_driver usb_serial_driver = {
48 .name = "usbserial",
49 .probe = usb_serial_probe,
50 .disconnect = usb_serial_disconnect,
51 .suspend = usb_serial_suspend,
52 .resume = usb_serial_resume,
53 .no_dynamic_id = 1,
54 };
55
56 /* There is no MODULE_DEVICE_TABLE for usbserial.c. Instead
57 the MODULE_DEVICE_TABLE declarations in each serial driver
58 cause the "hotplug" program to pull in whatever module is necessary
59 via modprobe, and modprobe will load usbserial because the serial
60 drivers depend on it.
61 */
62
63 static int debug;
64 /* initially all NULL */
65 static struct usb_serial *serial_table[SERIAL_TTY_MINORS];
66 static DEFINE_MUTEX(table_lock);
67 static LIST_HEAD(usb_serial_driver_list);
68
69 /*
70 * Look up the serial structure. If it is found and it hasn't been
71 * disconnected, return with its disc_mutex held and its refcount
72 * incremented. Otherwise return NULL.
73 */
74 struct usb_serial *usb_serial_get_by_index(unsigned index)
75 {
76 struct usb_serial *serial;
77
78 mutex_lock(&table_lock);
79 serial = serial_table[index];
80
81 if (serial) {
82 mutex_lock(&serial->disc_mutex);
83 if (serial->disconnected) {
84 mutex_unlock(&serial->disc_mutex);
85 serial = NULL;
86 } else {
87 kref_get(&serial->kref);
88 }
89 }
90 mutex_unlock(&table_lock);
91 return serial;
92 }
93
94 static struct usb_serial *get_free_serial(struct usb_serial *serial,
95 int num_ports, unsigned int *minor)
96 {
97 unsigned int i, j;
98 int good_spot;
99
100 dbg("%s %d", __func__, num_ports);
101
102 *minor = 0;
103 mutex_lock(&table_lock);
104 for (i = 0; i < SERIAL_TTY_MINORS; ++i) {
105 if (serial_table[i])
106 continue;
107
108 good_spot = 1;
109 for (j = 1; j <= num_ports-1; ++j)
110 if ((i+j >= SERIAL_TTY_MINORS) || (serial_table[i+j])) {
111 good_spot = 0;
112 i += j;
113 break;
114 }
115 if (good_spot == 0)
116 continue;
117
118 *minor = i;
119 j = 0;
120 dbg("%s - minor base = %d", __func__, *minor);
121 for (i = *minor; (i < (*minor + num_ports)) && (i < SERIAL_TTY_MINORS); ++i) {
122 serial_table[i] = serial;
123 serial->port[j++]->number = i;
124 }
125 mutex_unlock(&table_lock);
126 return serial;
127 }
128 mutex_unlock(&table_lock);
129 return NULL;
130 }
131
132 static void return_serial(struct usb_serial *serial)
133 {
134 int i;
135
136 dbg("%s", __func__);
137
138 mutex_lock(&table_lock);
139 for (i = 0; i < serial->num_ports; ++i)
140 serial_table[serial->minor + i] = NULL;
141 mutex_unlock(&table_lock);
142 }
143
144 static void destroy_serial(struct kref *kref)
145 {
146 struct usb_serial *serial;
147 struct usb_serial_port *port;
148 int i;
149
150 serial = to_usb_serial(kref);
151
152 dbg("%s - %s", __func__, serial->type->description);
153
154 /* return the minor range that this device had */
155 if (serial->minor != SERIAL_TTY_NO_MINOR)
156 return_serial(serial);
157
158 serial->type->release(serial);
159
160 /* Now that nothing is using the ports, they can be freed */
161 for (i = 0; i < serial->num_port_pointers; ++i) {
162 port = serial->port[i];
163 if (port) {
164 port->serial = NULL;
165 put_device(&port->dev);
166 }
167 }
168
169 usb_put_dev(serial->dev);
170 kfree(serial);
171 }
172
173 void usb_serial_put(struct usb_serial *serial)
174 {
175 kref_put(&serial->kref, destroy_serial);
176 }
177
178 /*****************************************************************************
179 * Driver tty interface functions
180 *****************************************************************************/
181
182 /**
183 * serial_install - install tty
184 * @driver: the driver (USB in our case)
185 * @tty: the tty being created
186 *
187 * Create the termios objects for this tty. We use the default
188 * USB serial settings but permit them to be overridden by
189 * serial->type->init_termios.
190 *
191 * This is the first place a new tty gets used. Hence this is where we
192 * acquire references to the usb_serial structure and the driver module,
193 * where we store a pointer to the port, and where we do an autoresume.
194 * All these actions are reversed in serial_release().
195 */
196 static int serial_install(struct tty_driver *driver, struct tty_struct *tty)
197 {
198 int idx = tty->index;
199 struct usb_serial *serial;
200 struct usb_serial_port *port;
201 int retval = -ENODEV;
202
203 dbg("%s", __func__);
204
205 serial = usb_serial_get_by_index(idx);
206 if (!serial)
207 return retval;
208
209 port = serial->port[idx - serial->minor];
210 if (!port)
211 goto error_no_port;
212 if (!try_module_get(serial->type->driver.owner))
213 goto error_module_get;
214
215 /* perform the standard setup */
216 retval = tty_init_termios(tty);
217 if (retval)
218 goto error_init_termios;
219
220 retval = usb_autopm_get_interface(serial->interface);
221 if (retval)
222 goto error_get_interface;
223
224 mutex_unlock(&serial->disc_mutex);
225
226 /* allow the driver to update the settings */
227 if (serial->type->init_termios)
228 serial->type->init_termios(tty);
229
230 tty->driver_data = port;
231
232 /* Final install (we use the default method) */
233 tty_driver_kref_get(driver);
234 tty->count++;
235 driver->ttys[idx] = tty;
236 return retval;
237
238 error_get_interface:
239 error_init_termios:
240 module_put(serial->type->driver.owner);
241 error_module_get:
242 error_no_port:
243 usb_serial_put(serial);
244 mutex_unlock(&serial->disc_mutex);
245 return retval;
246 }
247
248 static int serial_open(struct tty_struct *tty, struct file *filp)
249 {
250 struct usb_serial_port *port = tty->driver_data;
251 struct usb_serial *serial = port->serial;
252 int retval;
253
254 dbg("%s - port %d", __func__, port->number);
255
256 spin_lock_irq(&port->port.lock);
257 if (!tty_hung_up_p(filp))
258 ++port->port.count;
259 spin_unlock_irq(&port->port.lock);
260 tty_port_tty_set(&port->port, tty);
261
262 /* Do the device-specific open only if the hardware isn't
263 * already initialized.
264 */
265 if (!test_bit(ASYNCB_INITIALIZED, &port->port.flags)) {
266 if (mutex_lock_interruptible(&port->mutex))
267 return -ERESTARTSYS;
268 mutex_lock(&serial->disc_mutex);
269 if (serial->disconnected)
270 retval = -ENODEV;
271 else
272 retval = port->serial->type->open(tty, port);
273 mutex_unlock(&serial->disc_mutex);
274 mutex_unlock(&port->mutex);
275 if (retval)
276 return retval;
277 set_bit(ASYNCB_INITIALIZED, &port->port.flags);
278 }
279
280 /* Now do the correct tty layer semantics */
281 retval = tty_port_block_til_ready(&port->port, tty, filp);
282 return retval;
283 }
284
285 /**
286 * serial_down - shut down hardware
287 * @port: port to shut down
288 *
289 * Shut down a USB serial port unless it is the console. We never
290 * shut down the console hardware as it will always be in use.
291 */
292 static void serial_down(struct usb_serial_port *port)
293 {
294 struct usb_serial_driver *drv = port->serial->type;
295
296 /*
297 * The console is magical. Do not hang up the console hardware
298 * or there will be tears.
299 */
300 if (port->console)
301 return;
302
303 /* Don't call the close method if the hardware hasn't been
304 * initialized.
305 */
306 if (!test_and_clear_bit(ASYNCB_INITIALIZED, &port->port.flags))
307 return;
308
309 mutex_lock(&port->mutex);
310 if (drv->close)
311 drv->close(port);
312 mutex_unlock(&port->mutex);
313 }
314
315 static void serial_hangup(struct tty_struct *tty)
316 {
317 struct usb_serial_port *port = tty->driver_data;
318
319 dbg("%s - port %d", __func__, port->number);
320
321 serial_down(port);
322 tty_port_hangup(&port->port);
323 }
324
325 static void serial_close(struct tty_struct *tty, struct file *filp)
326 {
327 struct usb_serial_port *port = tty->driver_data;
328
329 dbg("%s - port %d", __func__, port->number);
330
331 if (tty_hung_up_p(filp))
332 return;
333 if (tty_port_close_start(&port->port, tty, filp) == 0)
334 return;
335 serial_down(port);
336 tty_port_close_end(&port->port, tty);
337 tty_port_tty_set(&port->port, NULL);
338 }
339
340 /**
341 * serial_release - free resources post close/hangup
342 * @port: port to free up
343 *
344 * Do the resource freeing and refcount dropping for the port.
345 * Avoid freeing the console.
346 *
347 * Called when the last tty kref is dropped.
348 */
349 static void serial_release(struct tty_struct *tty)
350 {
351 struct usb_serial_port *port = tty->driver_data;
352 struct usb_serial *serial;
353 struct module *owner;
354
355 /* The console is magical. Do not hang up the console hardware
356 * or there will be tears.
357 */
358 if (port->console)
359 return;
360
361 dbg("%s - port %d", __func__, port->number);
362
363 /* Standard shutdown processing */
364 tty_shutdown(tty);
365
366 tty->driver_data = NULL;
367
368 serial = port->serial;
369 owner = serial->type->driver.owner;
370
371 mutex_lock(&serial->disc_mutex);
372 if (!serial->disconnected)
373 usb_autopm_put_interface(serial->interface);
374 mutex_unlock(&serial->disc_mutex);
375
376 usb_serial_put(serial);
377 module_put(owner);
378 }
379
380 static int serial_write(struct tty_struct *tty, const unsigned char *buf,
381 int count)
382 {
383 struct usb_serial_port *port = tty->driver_data;
384 int retval = -ENODEV;
385
386 if (port->serial->dev->state == USB_STATE_NOTATTACHED)
387 goto exit;
388
389 dbg("%s - port %d, %d byte(s)", __func__, port->number, count);
390
391 /* count is managed under the mutex lock for the tty so cannot
392 drop to zero until after the last close completes */
393 WARN_ON(!port->port.count);
394
395 /* pass on to the driver specific version of this function */
396 retval = port->serial->type->write(tty, port, buf, count);
397
398 exit:
399 return retval;
400 }
401
402 static int serial_write_room(struct tty_struct *tty)
403 {
404 struct usb_serial_port *port = tty->driver_data;
405 dbg("%s - port %d", __func__, port->number);
406 WARN_ON(!port->port.count);
407 /* pass on to the driver specific version of this function */
408 return port->serial->type->write_room(tty);
409 }
410
411 static int serial_chars_in_buffer(struct tty_struct *tty)
412 {
413 struct usb_serial_port *port = tty->driver_data;
414 dbg("%s = port %d", __func__, port->number);
415
416 /* if the device was unplugged then any remaining characters
417 fell out of the connector ;) */
418 if (port->serial->disconnected)
419 return 0;
420 /* pass on to the driver specific version of this function */
421 return port->serial->type->chars_in_buffer(tty);
422 }
423
424 static void serial_throttle(struct tty_struct *tty)
425 {
426 struct usb_serial_port *port = tty->driver_data;
427 dbg("%s - port %d", __func__, port->number);
428
429 WARN_ON(!port->port.count);
430 /* pass on to the driver specific version of this function */
431 if (port->serial->type->throttle)
432 port->serial->type->throttle(tty);
433 }
434
435 static void serial_unthrottle(struct tty_struct *tty)
436 {
437 struct usb_serial_port *port = tty->driver_data;
438 dbg("%s - port %d", __func__, port->number);
439
440 WARN_ON(!port->port.count);
441 /* pass on to the driver specific version of this function */
442 if (port->serial->type->unthrottle)
443 port->serial->type->unthrottle(tty);
444 }
445
446 static int serial_ioctl(struct tty_struct *tty, struct file *file,
447 unsigned int cmd, unsigned long arg)
448 {
449 struct usb_serial_port *port = tty->driver_data;
450 int retval = -ENODEV;
451
452 dbg("%s - port %d, cmd 0x%.4x", __func__, port->number, cmd);
453
454 WARN_ON(!port->port.count);
455
456 /* pass on to the driver specific version of this function
457 if it is available */
458 if (port->serial->type->ioctl) {
459 retval = port->serial->type->ioctl(tty, file, cmd, arg);
460 } else
461 retval = -ENOIOCTLCMD;
462 return retval;
463 }
464
465 static void serial_set_termios(struct tty_struct *tty, struct ktermios *old)
466 {
467 struct usb_serial_port *port = tty->driver_data;
468 dbg("%s - port %d", __func__, port->number);
469
470 WARN_ON(!port->port.count);
471 /* pass on to the driver specific version of this function
472 if it is available */
473 if (port->serial->type->set_termios)
474 port->serial->type->set_termios(tty, port, old);
475 else
476 tty_termios_copy_hw(tty->termios, old);
477 }
478
479 static int serial_break(struct tty_struct *tty, int break_state)
480 {
481 struct usb_serial_port *port = tty->driver_data;
482
483 dbg("%s - port %d", __func__, port->number);
484
485 WARN_ON(!port->port.count);
486 /* pass on to the driver specific version of this function
487 if it is available */
488 if (port->serial->type->break_ctl)
489 port->serial->type->break_ctl(tty, break_state);
490 return 0;
491 }
492
493 static int serial_proc_show(struct seq_file *m, void *v)
494 {
495 struct usb_serial *serial;
496 int i;
497 char tmp[40];
498
499 dbg("%s", __func__);
500 seq_puts(m, "usbserinfo:1.0 driver:2.0\n");
501 for (i = 0; i < SERIAL_TTY_MINORS; ++i) {
502 serial = usb_serial_get_by_index(i);
503 if (serial == NULL)
504 continue;
505
506 seq_printf(m, "%d:", i);
507 if (serial->type->driver.owner)
508 seq_printf(m, " module:%s",
509 module_name(serial->type->driver.owner));
510 seq_printf(m, " name:\"%s\"",
511 serial->type->description);
512 seq_printf(m, " vendor:%04x product:%04x",
513 le16_to_cpu(serial->dev->descriptor.idVendor),
514 le16_to_cpu(serial->dev->descriptor.idProduct));
515 seq_printf(m, " num_ports:%d", serial->num_ports);
516 seq_printf(m, " port:%d", i - serial->minor + 1);
517 usb_make_path(serial->dev, tmp, sizeof(tmp));
518 seq_printf(m, " path:%s", tmp);
519
520 seq_putc(m, '\n');
521 usb_serial_put(serial);
522 mutex_unlock(&serial->disc_mutex);
523 }
524 return 0;
525 }
526
527 static int serial_proc_open(struct inode *inode, struct file *file)
528 {
529 return single_open(file, serial_proc_show, NULL);
530 }
531
532 static const struct file_operations serial_proc_fops = {
533 .owner = THIS_MODULE,
534 .open = serial_proc_open,
535 .read = seq_read,
536 .llseek = seq_lseek,
537 .release = single_release,
538 };
539
540 static int serial_tiocmget(struct tty_struct *tty, struct file *file)
541 {
542 struct usb_serial_port *port = tty->driver_data;
543
544 dbg("%s - port %d", __func__, port->number);
545
546 WARN_ON(!port->port.count);
547 if (port->serial->type->tiocmget)
548 return port->serial->type->tiocmget(tty, file);
549 return -EINVAL;
550 }
551
552 static int serial_tiocmset(struct tty_struct *tty, struct file *file,
553 unsigned int set, unsigned int clear)
554 {
555 struct usb_serial_port *port = tty->driver_data;
556
557 dbg("%s - port %d", __func__, port->number);
558
559 WARN_ON(!port->port.count);
560 if (port->serial->type->tiocmset)
561 return port->serial->type->tiocmset(tty, file, set, clear);
562 return -EINVAL;
563 }
564
565 /*
566 * We would be calling tty_wakeup here, but unfortunately some line
567 * disciplines have an annoying habit of calling tty->write from
568 * the write wakeup callback (e.g. n_hdlc.c).
569 */
570 void usb_serial_port_softint(struct usb_serial_port *port)
571 {
572 schedule_work(&port->work);
573 }
574 EXPORT_SYMBOL_GPL(usb_serial_port_softint);
575
576 static void usb_serial_port_work(struct work_struct *work)
577 {
578 struct usb_serial_port *port =
579 container_of(work, struct usb_serial_port, work);
580 struct tty_struct *tty;
581
582 dbg("%s - port %d", __func__, port->number);
583
584 tty = tty_port_tty_get(&port->port);
585 if (!tty)
586 return;
587
588 tty_wakeup(tty);
589 tty_kref_put(tty);
590 }
591
592 static void kill_traffic(struct usb_serial_port *port)
593 {
594 usb_kill_urb(port->read_urb);
595 usb_kill_urb(port->write_urb);
596 /*
597 * This is tricky.
598 * Some drivers submit the read_urb in the
599 * handler for the write_urb or vice versa
600 * this order determines the order in which
601 * usb_kill_urb() must be used to reliably
602 * kill the URBs. As it is unknown here,
603 * both orders must be used in turn.
604 * The call below is not redundant.
605 */
606 usb_kill_urb(port->read_urb);
607 usb_kill_urb(port->interrupt_in_urb);
608 usb_kill_urb(port->interrupt_out_urb);
609 }
610
611 static void port_release(struct device *dev)
612 {
613 struct usb_serial_port *port = to_usb_serial_port(dev);
614
615 dbg ("%s - %s", __func__, dev_name(dev));
616
617 /*
618 * Stop all the traffic before cancelling the work, so that
619 * nobody will restart it by calling usb_serial_port_softint.
620 */
621 kill_traffic(port);
622 cancel_work_sync(&port->work);
623
624 usb_free_urb(port->read_urb);
625 usb_free_urb(port->write_urb);
626 usb_free_urb(port->interrupt_in_urb);
627 usb_free_urb(port->interrupt_out_urb);
628 kfree(port->bulk_in_buffer);
629 kfree(port->bulk_out_buffer);
630 kfree(port->interrupt_in_buffer);
631 kfree(port->interrupt_out_buffer);
632 kfree(port);
633 }
634
635 static struct usb_serial *create_serial(struct usb_device *dev,
636 struct usb_interface *interface,
637 struct usb_serial_driver *driver)
638 {
639 struct usb_serial *serial;
640
641 serial = kzalloc(sizeof(*serial), GFP_KERNEL);
642 if (!serial) {
643 dev_err(&dev->dev, "%s - out of memory\n", __func__);
644 return NULL;
645 }
646 serial->dev = usb_get_dev(dev);
647 serial->type = driver;
648 serial->interface = interface;
649 kref_init(&serial->kref);
650 mutex_init(&serial->disc_mutex);
651 serial->minor = SERIAL_TTY_NO_MINOR;
652
653 return serial;
654 }
655
656 static const struct usb_device_id *match_dynamic_id(struct usb_interface *intf,
657 struct usb_serial_driver *drv)
658 {
659 struct usb_dynid *dynid;
660
661 spin_lock(&drv->dynids.lock);
662 list_for_each_entry(dynid, &drv->dynids.list, node) {
663 if (usb_match_one_id(intf, &dynid->id)) {
664 spin_unlock(&drv->dynids.lock);
665 return &dynid->id;
666 }
667 }
668 spin_unlock(&drv->dynids.lock);
669 return NULL;
670 }
671
672 static const struct usb_device_id *get_iface_id(struct usb_serial_driver *drv,
673 struct usb_interface *intf)
674 {
675 const struct usb_device_id *id;
676
677 id = usb_match_id(intf, drv->id_table);
678 if (id) {
679 dbg("static descriptor matches");
680 goto exit;
681 }
682 id = match_dynamic_id(intf, drv);
683 if (id)
684 dbg("dynamic descriptor matches");
685 exit:
686 return id;
687 }
688
689 static struct usb_serial_driver *search_serial_device(
690 struct usb_interface *iface)
691 {
692 const struct usb_device_id *id;
693 struct usb_serial_driver *drv;
694
695 /* Check if the usb id matches a known device */
696 list_for_each_entry(drv, &usb_serial_driver_list, driver_list) {
697 id = get_iface_id(drv, iface);
698 if (id)
699 return drv;
700 }
701
702 return NULL;
703 }
704
705 static int serial_carrier_raised(struct tty_port *port)
706 {
707 struct usb_serial_port *p = container_of(port, struct usb_serial_port, port);
708 struct usb_serial_driver *drv = p->serial->type;
709 if (drv->carrier_raised)
710 return drv->carrier_raised(p);
711 /* No carrier control - don't block */
712 return 1;
713 }
714
715 static void serial_dtr_rts(struct tty_port *port, int on)
716 {
717 struct usb_serial_port *p = container_of(port, struct usb_serial_port, port);
718 struct usb_serial_driver *drv = p->serial->type;
719 if (drv->dtr_rts)
720 drv->dtr_rts(p, on);
721 }
722
723 static const struct tty_port_operations serial_port_ops = {
724 .carrier_raised = serial_carrier_raised,
725 .dtr_rts = serial_dtr_rts,
726 };
727
728 int usb_serial_probe(struct usb_interface *interface,
729 const struct usb_device_id *id)
730 {
731 struct usb_device *dev = interface_to_usbdev(interface);
732 struct usb_serial *serial = NULL;
733 struct usb_serial_port *port;
734 struct usb_host_interface *iface_desc;
735 struct usb_endpoint_descriptor *endpoint;
736 struct usb_endpoint_descriptor *interrupt_in_endpoint[MAX_NUM_PORTS];
737 struct usb_endpoint_descriptor *interrupt_out_endpoint[MAX_NUM_PORTS];
738 struct usb_endpoint_descriptor *bulk_in_endpoint[MAX_NUM_PORTS];
739 struct usb_endpoint_descriptor *bulk_out_endpoint[MAX_NUM_PORTS];
740 struct usb_serial_driver *type = NULL;
741 int retval;
742 unsigned int minor;
743 int buffer_size;
744 int i;
745 int num_interrupt_in = 0;
746 int num_interrupt_out = 0;
747 int num_bulk_in = 0;
748 int num_bulk_out = 0;
749 int num_ports = 0;
750 int max_endpoints;
751
752 lock_kernel(); /* guard against unloading a serial driver module */
753 type = search_serial_device(interface);
754 if (!type) {
755 unlock_kernel();
756 dbg("none matched");
757 return -ENODEV;
758 }
759
760 serial = create_serial(dev, interface, type);
761 if (!serial) {
762 unlock_kernel();
763 dev_err(&interface->dev, "%s - out of memory\n", __func__);
764 return -ENOMEM;
765 }
766
767 /* if this device type has a probe function, call it */
768 if (type->probe) {
769 const struct usb_device_id *id;
770
771 if (!try_module_get(type->driver.owner)) {
772 unlock_kernel();
773 dev_err(&interface->dev,
774 "module get failed, exiting\n");
775 kfree(serial);
776 return -EIO;
777 }
778
779 id = get_iface_id(type, interface);
780 retval = type->probe(serial, id);
781 module_put(type->driver.owner);
782
783 if (retval) {
784 unlock_kernel();
785 dbg("sub driver rejected device");
786 kfree(serial);
787 return retval;
788 }
789 }
790
791 /* descriptor matches, let's find the endpoints needed */
792 /* check out the endpoints */
793 iface_desc = interface->cur_altsetting;
794 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
795 endpoint = &iface_desc->endpoint[i].desc;
796
797 if (usb_endpoint_is_bulk_in(endpoint)) {
798 /* we found a bulk in endpoint */
799 dbg("found bulk in on endpoint %d", i);
800 bulk_in_endpoint[num_bulk_in] = endpoint;
801 ++num_bulk_in;
802 }
803
804 if (usb_endpoint_is_bulk_out(endpoint)) {
805 /* we found a bulk out endpoint */
806 dbg("found bulk out on endpoint %d", i);
807 bulk_out_endpoint[num_bulk_out] = endpoint;
808 ++num_bulk_out;
809 }
810
811 if (usb_endpoint_is_int_in(endpoint)) {
812 /* we found a interrupt in endpoint */
813 dbg("found interrupt in on endpoint %d", i);
814 interrupt_in_endpoint[num_interrupt_in] = endpoint;
815 ++num_interrupt_in;
816 }
817
818 if (usb_endpoint_is_int_out(endpoint)) {
819 /* we found an interrupt out endpoint */
820 dbg("found interrupt out on endpoint %d", i);
821 interrupt_out_endpoint[num_interrupt_out] = endpoint;
822 ++num_interrupt_out;
823 }
824 }
825
826 #if defined(CONFIG_USB_SERIAL_PL2303) || defined(CONFIG_USB_SERIAL_PL2303_MODULE)
827 /* BEGIN HORRIBLE HACK FOR PL2303 */
828 /* this is needed due to the looney way its endpoints are set up */
829 if (((le16_to_cpu(dev->descriptor.idVendor) == PL2303_VENDOR_ID) &&
830 (le16_to_cpu(dev->descriptor.idProduct) == PL2303_PRODUCT_ID)) ||
831 ((le16_to_cpu(dev->descriptor.idVendor) == ATEN_VENDOR_ID) &&
832 (le16_to_cpu(dev->descriptor.idProduct) == ATEN_PRODUCT_ID)) ||
833 ((le16_to_cpu(dev->descriptor.idVendor) == ALCOR_VENDOR_ID) &&
834 (le16_to_cpu(dev->descriptor.idProduct) == ALCOR_PRODUCT_ID)) ||
835 ((le16_to_cpu(dev->descriptor.idVendor) == SIEMENS_VENDOR_ID) &&
836 (le16_to_cpu(dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_EF81))) {
837 if (interface != dev->actconfig->interface[0]) {
838 /* check out the endpoints of the other interface*/
839 iface_desc = dev->actconfig->interface[0]->cur_altsetting;
840 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
841 endpoint = &iface_desc->endpoint[i].desc;
842 if (usb_endpoint_is_int_in(endpoint)) {
843 /* we found a interrupt in endpoint */
844 dbg("found interrupt in for Prolific device on separate interface");
845 interrupt_in_endpoint[num_interrupt_in] = endpoint;
846 ++num_interrupt_in;
847 }
848 }
849 }
850
851 /* Now make sure the PL-2303 is configured correctly.
852 * If not, give up now and hope this hack will work
853 * properly during a later invocation of usb_serial_probe
854 */
855 if (num_bulk_in == 0 || num_bulk_out == 0) {
856 unlock_kernel();
857 dev_info(&interface->dev, "PL-2303 hack: descriptors matched but endpoints did not\n");
858 kfree(serial);
859 return -ENODEV;
860 }
861 }
862 /* END HORRIBLE HACK FOR PL2303 */
863 #endif
864
865 #ifdef CONFIG_USB_SERIAL_GENERIC
866 if (type == &usb_serial_generic_device) {
867 num_ports = num_bulk_out;
868 if (num_ports == 0) {
869 unlock_kernel();
870 dev_err(&interface->dev,
871 "Generic device with no bulk out, not allowed.\n");
872 kfree(serial);
873 return -EIO;
874 }
875 }
876 #endif
877 if (!num_ports) {
878 /* if this device type has a calc_num_ports function, call it */
879 if (type->calc_num_ports) {
880 if (!try_module_get(type->driver.owner)) {
881 unlock_kernel();
882 dev_err(&interface->dev,
883 "module get failed, exiting\n");
884 kfree(serial);
885 return -EIO;
886 }
887 num_ports = type->calc_num_ports(serial);
888 module_put(type->driver.owner);
889 }
890 if (!num_ports)
891 num_ports = type->num_ports;
892 }
893
894 serial->num_ports = num_ports;
895 serial->num_bulk_in = num_bulk_in;
896 serial->num_bulk_out = num_bulk_out;
897 serial->num_interrupt_in = num_interrupt_in;
898 serial->num_interrupt_out = num_interrupt_out;
899
900 /* found all that we need */
901 dev_info(&interface->dev, "%s converter detected\n",
902 type->description);
903
904 /* create our ports, we need as many as the max endpoints */
905 /* we don't use num_ports here because some devices have more
906 endpoint pairs than ports */
907 max_endpoints = max(num_bulk_in, num_bulk_out);
908 max_endpoints = max(max_endpoints, num_interrupt_in);
909 max_endpoints = max(max_endpoints, num_interrupt_out);
910 max_endpoints = max(max_endpoints, (int)serial->num_ports);
911 serial->num_port_pointers = max_endpoints;
912 unlock_kernel();
913
914 dbg("%s - setting up %d port structures for this device",
915 __func__, max_endpoints);
916 for (i = 0; i < max_endpoints; ++i) {
917 port = kzalloc(sizeof(struct usb_serial_port), GFP_KERNEL);
918 if (!port)
919 goto probe_error;
920 tty_port_init(&port->port);
921 port->port.ops = &serial_port_ops;
922 port->serial = serial;
923 spin_lock_init(&port->lock);
924 mutex_init(&port->mutex);
925 INIT_WORK(&port->work, usb_serial_port_work);
926 serial->port[i] = port;
927 port->dev.parent = &interface->dev;
928 port->dev.driver = NULL;
929 port->dev.bus = &usb_serial_bus_type;
930 port->dev.release = &port_release;
931 device_initialize(&port->dev);
932 }
933
934 /* set up the endpoint information */
935 for (i = 0; i < num_bulk_in; ++i) {
936 endpoint = bulk_in_endpoint[i];
937 port = serial->port[i];
938 port->read_urb = usb_alloc_urb(0, GFP_KERNEL);
939 if (!port->read_urb) {
940 dev_err(&interface->dev, "No free urbs available\n");
941 goto probe_error;
942 }
943 buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
944 port->bulk_in_size = buffer_size;
945 port->bulk_in_endpointAddress = endpoint->bEndpointAddress;
946 port->bulk_in_buffer = kmalloc(buffer_size, GFP_KERNEL);
947 if (!port->bulk_in_buffer) {
948 dev_err(&interface->dev,
949 "Couldn't allocate bulk_in_buffer\n");
950 goto probe_error;
951 }
952 usb_fill_bulk_urb(port->read_urb, dev,
953 usb_rcvbulkpipe(dev,
954 endpoint->bEndpointAddress),
955 port->bulk_in_buffer, buffer_size,
956 serial->type->read_bulk_callback, port);
957 }
958
959 for (i = 0; i < num_bulk_out; ++i) {
960 endpoint = bulk_out_endpoint[i];
961 port = serial->port[i];
962 port->write_urb = usb_alloc_urb(0, GFP_KERNEL);
963 if (!port->write_urb) {
964 dev_err(&interface->dev, "No free urbs available\n");
965 goto probe_error;
966 }
967 buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
968 port->bulk_out_size = buffer_size;
969 port->bulk_out_endpointAddress = endpoint->bEndpointAddress;
970 port->bulk_out_buffer = kmalloc(buffer_size, GFP_KERNEL);
971 if (!port->bulk_out_buffer) {
972 dev_err(&interface->dev,
973 "Couldn't allocate bulk_out_buffer\n");
974 goto probe_error;
975 }
976 usb_fill_bulk_urb(port->write_urb, dev,
977 usb_sndbulkpipe(dev,
978 endpoint->bEndpointAddress),
979 port->bulk_out_buffer, buffer_size,
980 serial->type->write_bulk_callback, port);
981 }
982
983 if (serial->type->read_int_callback) {
984 for (i = 0; i < num_interrupt_in; ++i) {
985 endpoint = interrupt_in_endpoint[i];
986 port = serial->port[i];
987 port->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
988 if (!port->interrupt_in_urb) {
989 dev_err(&interface->dev,
990 "No free urbs available\n");
991 goto probe_error;
992 }
993 buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
994 port->interrupt_in_endpointAddress =
995 endpoint->bEndpointAddress;
996 port->interrupt_in_buffer = kmalloc(buffer_size,
997 GFP_KERNEL);
998 if (!port->interrupt_in_buffer) {
999 dev_err(&interface->dev,
1000 "Couldn't allocate interrupt_in_buffer\n");
1001 goto probe_error;
1002 }
1003 usb_fill_int_urb(port->interrupt_in_urb, dev,
1004 usb_rcvintpipe(dev,
1005 endpoint->bEndpointAddress),
1006 port->interrupt_in_buffer, buffer_size,
1007 serial->type->read_int_callback, port,
1008 endpoint->bInterval);
1009 }
1010 } else if (num_interrupt_in) {
1011 dbg("the device claims to support interrupt in transfers, but read_int_callback is not defined");
1012 }
1013
1014 if (serial->type->write_int_callback) {
1015 for (i = 0; i < num_interrupt_out; ++i) {
1016 endpoint = interrupt_out_endpoint[i];
1017 port = serial->port[i];
1018 port->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
1019 if (!port->interrupt_out_urb) {
1020 dev_err(&interface->dev,
1021 "No free urbs available\n");
1022 goto probe_error;
1023 }
1024 buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
1025 port->interrupt_out_size = buffer_size;
1026 port->interrupt_out_endpointAddress =
1027 endpoint->bEndpointAddress;
1028 port->interrupt_out_buffer = kmalloc(buffer_size,
1029 GFP_KERNEL);
1030 if (!port->interrupt_out_buffer) {
1031 dev_err(&interface->dev,
1032 "Couldn't allocate interrupt_out_buffer\n");
1033 goto probe_error;
1034 }
1035 usb_fill_int_urb(port->interrupt_out_urb, dev,
1036 usb_sndintpipe(dev,
1037 endpoint->bEndpointAddress),
1038 port->interrupt_out_buffer, buffer_size,
1039 serial->type->write_int_callback, port,
1040 endpoint->bInterval);
1041 }
1042 } else if (num_interrupt_out) {
1043 dbg("the device claims to support interrupt out transfers, but write_int_callback is not defined");
1044 }
1045
1046 /* if this device type has an attach function, call it */
1047 if (type->attach) {
1048 if (!try_module_get(type->driver.owner)) {
1049 dev_err(&interface->dev,
1050 "module get failed, exiting\n");
1051 goto probe_error;
1052 }
1053 retval = type->attach(serial);
1054 module_put(type->driver.owner);
1055 if (retval < 0)
1056 goto probe_error;
1057 if (retval > 0) {
1058 /* quietly accept this device, but don't bind to a
1059 serial port as it's about to disappear */
1060 serial->num_ports = 0;
1061 goto exit;
1062 }
1063 }
1064
1065 if (get_free_serial(serial, num_ports, &minor) == NULL) {
1066 dev_err(&interface->dev, "No more free serial devices\n");
1067 goto probe_error;
1068 }
1069 serial->minor = minor;
1070
1071 /* register all of the individual ports with the driver core */
1072 for (i = 0; i < num_ports; ++i) {
1073 port = serial->port[i];
1074 dev_set_name(&port->dev, "ttyUSB%d", port->number);
1075 dbg ("%s - registering %s", __func__, dev_name(&port->dev));
1076 port->dev_state = PORT_REGISTERING;
1077 retval = device_add(&port->dev);
1078 if (retval) {
1079 dev_err(&port->dev, "Error registering port device, "
1080 "continuing\n");
1081 port->dev_state = PORT_UNREGISTERED;
1082 } else {
1083 port->dev_state = PORT_REGISTERED;
1084 }
1085 }
1086
1087 usb_serial_console_init(debug, minor);
1088
1089 exit:
1090 /* success */
1091 usb_set_intfdata(interface, serial);
1092 return 0;
1093
1094 probe_error:
1095 usb_serial_put(serial);
1096 return -EIO;
1097 }
1098 EXPORT_SYMBOL_GPL(usb_serial_probe);
1099
1100 void usb_serial_disconnect(struct usb_interface *interface)
1101 {
1102 int i;
1103 struct usb_serial *serial = usb_get_intfdata(interface);
1104 struct device *dev = &interface->dev;
1105 struct usb_serial_port *port;
1106
1107 usb_serial_console_disconnect(serial);
1108 dbg("%s", __func__);
1109
1110 mutex_lock(&serial->disc_mutex);
1111 usb_set_intfdata(interface, NULL);
1112 /* must set a flag, to signal subdrivers */
1113 serial->disconnected = 1;
1114 mutex_unlock(&serial->disc_mutex);
1115
1116 for (i = 0; i < serial->num_ports; ++i) {
1117 port = serial->port[i];
1118 if (port) {
1119 struct tty_struct *tty = tty_port_tty_get(&port->port);
1120 if (tty) {
1121 tty_vhangup(tty);
1122 tty_kref_put(tty);
1123 }
1124 kill_traffic(port);
1125 cancel_work_sync(&port->work);
1126 if (port->dev_state == PORT_REGISTERED) {
1127
1128 /* Make sure the port is bound so that the
1129 * driver's port_remove method is called.
1130 */
1131 if (!port->dev.driver) {
1132 int rc;
1133
1134 port->dev.driver =
1135 &serial->type->driver;
1136 rc = device_bind_driver(&port->dev);
1137 }
1138 port->dev_state = PORT_UNREGISTERING;
1139 device_del(&port->dev);
1140 port->dev_state = PORT_UNREGISTERED;
1141 }
1142 }
1143 }
1144 serial->type->disconnect(serial);
1145
1146 /* let the last holder of this object cause it to be cleaned up */
1147 usb_serial_put(serial);
1148 dev_info(dev, "device disconnected\n");
1149 }
1150 EXPORT_SYMBOL_GPL(usb_serial_disconnect);
1151
1152 int usb_serial_suspend(struct usb_interface *intf, pm_message_t message)
1153 {
1154 struct usb_serial *serial = usb_get_intfdata(intf);
1155 struct usb_serial_port *port;
1156 int i, r = 0;
1157
1158 serial->suspending = 1;
1159
1160 if (serial->type->suspend) {
1161 r = serial->type->suspend(serial, message);
1162 if (r < 0)
1163 goto err_out;
1164 }
1165
1166 for (i = 0; i < serial->num_ports; ++i) {
1167 port = serial->port[i];
1168 if (port)
1169 kill_traffic(port);
1170 }
1171
1172 err_out:
1173 return r;
1174 }
1175 EXPORT_SYMBOL(usb_serial_suspend);
1176
1177 int usb_serial_resume(struct usb_interface *intf)
1178 {
1179 struct usb_serial *serial = usb_get_intfdata(intf);
1180 int rv;
1181
1182 serial->suspending = 0;
1183 if (serial->type->resume)
1184 rv = serial->type->resume(serial);
1185 else
1186 rv = usb_serial_generic_resume(serial);
1187
1188 return rv;
1189 }
1190 EXPORT_SYMBOL(usb_serial_resume);
1191
1192 static const struct tty_operations serial_ops = {
1193 .open = serial_open,
1194 .close = serial_close,
1195 .write = serial_write,
1196 .hangup = serial_hangup,
1197 .write_room = serial_write_room,
1198 .ioctl = serial_ioctl,
1199 .set_termios = serial_set_termios,
1200 .throttle = serial_throttle,
1201 .unthrottle = serial_unthrottle,
1202 .break_ctl = serial_break,
1203 .chars_in_buffer = serial_chars_in_buffer,
1204 .tiocmget = serial_tiocmget,
1205 .tiocmset = serial_tiocmset,
1206 .shutdown = serial_release,
1207 .install = serial_install,
1208 .proc_fops = &serial_proc_fops,
1209 };
1210
1211
1212 struct tty_driver *usb_serial_tty_driver;
1213
1214 static int __init usb_serial_init(void)
1215 {
1216 int i;
1217 int result;
1218
1219 usb_serial_tty_driver = alloc_tty_driver(SERIAL_TTY_MINORS);
1220 if (!usb_serial_tty_driver)
1221 return -ENOMEM;
1222
1223 /* Initialize our global data */
1224 for (i = 0; i < SERIAL_TTY_MINORS; ++i)
1225 serial_table[i] = NULL;
1226
1227 result = bus_register(&usb_serial_bus_type);
1228 if (result) {
1229 printk(KERN_ERR "usb-serial: %s - registering bus driver "
1230 "failed\n", __func__);
1231 goto exit_bus;
1232 }
1233
1234 usb_serial_tty_driver->owner = THIS_MODULE;
1235 usb_serial_tty_driver->driver_name = "usbserial";
1236 usb_serial_tty_driver->name = "ttyUSB";
1237 usb_serial_tty_driver->major = SERIAL_TTY_MAJOR;
1238 usb_serial_tty_driver->minor_start = 0;
1239 usb_serial_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
1240 usb_serial_tty_driver->subtype = SERIAL_TYPE_NORMAL;
1241 usb_serial_tty_driver->flags = TTY_DRIVER_REAL_RAW |
1242 TTY_DRIVER_DYNAMIC_DEV;
1243 usb_serial_tty_driver->init_termios = tty_std_termios;
1244 usb_serial_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD
1245 | HUPCL | CLOCAL;
1246 usb_serial_tty_driver->init_termios.c_ispeed = 9600;
1247 usb_serial_tty_driver->init_termios.c_ospeed = 9600;
1248 tty_set_operations(usb_serial_tty_driver, &serial_ops);
1249 result = tty_register_driver(usb_serial_tty_driver);
1250 if (result) {
1251 printk(KERN_ERR "usb-serial: %s - tty_register_driver failed\n",
1252 __func__);
1253 goto exit_reg_driver;
1254 }
1255
1256 /* register the USB driver */
1257 result = usb_register(&usb_serial_driver);
1258 if (result < 0) {
1259 printk(KERN_ERR "usb-serial: %s - usb_register failed\n",
1260 __func__);
1261 goto exit_tty;
1262 }
1263
1264 /* register the generic driver, if we should */
1265 result = usb_serial_generic_register(debug);
1266 if (result < 0) {
1267 printk(KERN_ERR "usb-serial: %s - registering generic "
1268 "driver failed\n", __func__);
1269 goto exit_generic;
1270 }
1271
1272 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1273
1274 return result;
1275
1276 exit_generic:
1277 usb_deregister(&usb_serial_driver);
1278
1279 exit_tty:
1280 tty_unregister_driver(usb_serial_tty_driver);
1281
1282 exit_reg_driver:
1283 bus_unregister(&usb_serial_bus_type);
1284
1285 exit_bus:
1286 printk(KERN_ERR "usb-serial: %s - returning with error %d\n",
1287 __func__, result);
1288 put_tty_driver(usb_serial_tty_driver);
1289 return result;
1290 }
1291
1292
1293 static void __exit usb_serial_exit(void)
1294 {
1295 usb_serial_console_exit();
1296
1297 usb_serial_generic_deregister();
1298
1299 usb_deregister(&usb_serial_driver);
1300 tty_unregister_driver(usb_serial_tty_driver);
1301 put_tty_driver(usb_serial_tty_driver);
1302 bus_unregister(&usb_serial_bus_type);
1303 }
1304
1305
1306 module_init(usb_serial_init);
1307 module_exit(usb_serial_exit);
1308
1309 #define set_to_generic_if_null(type, function) \
1310 do { \
1311 if (!type->function) { \
1312 type->function = usb_serial_generic_##function; \
1313 dbg("Had to override the " #function \
1314 " usb serial operation with the generic one.");\
1315 } \
1316 } while (0)
1317
1318 static void fixup_generic(struct usb_serial_driver *device)
1319 {
1320 set_to_generic_if_null(device, open);
1321 set_to_generic_if_null(device, write);
1322 set_to_generic_if_null(device, close);
1323 set_to_generic_if_null(device, write_room);
1324 set_to_generic_if_null(device, chars_in_buffer);
1325 set_to_generic_if_null(device, read_bulk_callback);
1326 set_to_generic_if_null(device, write_bulk_callback);
1327 set_to_generic_if_null(device, disconnect);
1328 set_to_generic_if_null(device, release);
1329 }
1330
1331 int usb_serial_register(struct usb_serial_driver *driver)
1332 {
1333 /* must be called with BKL held */
1334 int retval;
1335
1336 if (usb_disabled())
1337 return -ENODEV;
1338
1339 fixup_generic(driver);
1340
1341 if (!driver->description)
1342 driver->description = driver->driver.name;
1343
1344 /* Add this device to our list of devices */
1345 list_add(&driver->driver_list, &usb_serial_driver_list);
1346
1347 retval = usb_serial_bus_register(driver);
1348 if (retval) {
1349 printk(KERN_ERR "usb-serial: problem %d when registering "
1350 "driver %s\n", retval, driver->description);
1351 list_del(&driver->driver_list);
1352 } else
1353 printk(KERN_INFO "USB Serial support registered for %s\n",
1354 driver->description);
1355
1356 return retval;
1357 }
1358 EXPORT_SYMBOL_GPL(usb_serial_register);
1359
1360
1361 void usb_serial_deregister(struct usb_serial_driver *device)
1362 {
1363 /* must be called with BKL held */
1364 printk(KERN_INFO "USB Serial deregistering driver %s\n",
1365 device->description);
1366 list_del(&device->driver_list);
1367 usb_serial_bus_deregister(device);
1368 }
1369 EXPORT_SYMBOL_GPL(usb_serial_deregister);
1370
1371 /* Module information */
1372 MODULE_AUTHOR(DRIVER_AUTHOR);
1373 MODULE_DESCRIPTION(DRIVER_DESC);
1374 MODULE_LICENSE("GPL");
1375
1376 module_param(debug, bool, S_IRUGO | S_IWUSR);
1377 MODULE_PARM_DESC(debug, "Debug enabled or not");
linux 2.6 git repository for openrd