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usb: otg: notifier: switch to atomic notifier
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / usb / serial / usb-serial.c
blob546a52179becbc783a825bda99efd61c8a2d8bff
1 /*
2 * USB Serial Converter driver
3 *
4 * Copyright (C) 1999 - 2005 Greg Kroah-Hartman (greg@kroah.com)
5 * Copyright (C) 2000 Peter Berger (pberger@brimson.com)
6 * Copyright (C) 2000 Al Borchers (borchers@steinerpoint.com)
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License version
10 * 2 as published by the Free Software Foundation.
11 *
12 * This driver was originally based on the ACM driver by Armin Fuerst (which was
13 * based on a driver by Brad Keryan)
14 *
15 * See Documentation/usb/usb-serial.txt for more information on using this
16 * driver
17 *
18 */
19
20 #include <linux/kernel.h>
21 #include <linux/errno.h>
22 #include <linux/init.h>
23 #include <linux/slab.h>
24 #include <linux/tty.h>
25 #include <linux/tty_driver.h>
26 #include <linux/tty_flip.h>
27 #include <linux/module.h>
28 #include <linux/moduleparam.h>
29 #include <linux/seq_file.h>
30 #include <linux/spinlock.h>
31 #include <linux/mutex.h>
32 #include <linux/list.h>
33 #include <linux/uaccess.h>
34 #include <linux/serial.h>
35 #include <linux/usb.h>
36 #include <linux/usb/serial.h>
37 #include <linux/kfifo.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 .supports_autosuspend = 1,
55 };
56
57 /* There is no MODULE_DEVICE_TABLE for usbserial.c. Instead
58 the MODULE_DEVICE_TABLE declarations in each serial driver
59 cause the "hotplug" program to pull in whatever module is necessary
60 via modprobe, and modprobe will load usbserial because the serial
61 drivers depend on it.
62 */
63
64 static int debug;
65 /* initially all NULL */
66 static struct usb_serial *serial_table[SERIAL_TTY_MINORS];
67 static DEFINE_MUTEX(table_lock);
68 static LIST_HEAD(usb_serial_driver_list);
69
70 /*
71 * Look up the serial structure. If it is found and it hasn't been
72 * disconnected, return with its disc_mutex held and its refcount
73 * incremented. Otherwise return NULL.
74 */
75 struct usb_serial *usb_serial_get_by_index(unsigned index)
76 {
77 struct usb_serial *serial;
78
79 mutex_lock(&table_lock);
80 serial = serial_table[index];
81
82 if (serial) {
83 mutex_lock(&serial->disc_mutex);
84 if (serial->disconnected) {
85 mutex_unlock(&serial->disc_mutex);
86 serial = NULL;
87 } else {
88 kref_get(&serial->kref);
89 }
90 }
91 mutex_unlock(&table_lock);
92 return serial;
93 }
94
95 static struct usb_serial *get_free_serial(struct usb_serial *serial,
96 int num_ports, unsigned int *minor)
97 {
98 unsigned int i, j;
99 int good_spot;
100
101 dbg("%s %d", __func__, num_ports);
102
103 *minor = 0;
104 mutex_lock(&table_lock);
105 for (i = 0; i < SERIAL_TTY_MINORS; ++i) {
106 if (serial_table[i])
107 continue;
108
109 good_spot = 1;
110 for (j = 1; j <= num_ports-1; ++j)
111 if ((i+j >= SERIAL_TTY_MINORS) || (serial_table[i+j])) {
112 good_spot = 0;
113 i += j;
114 break;
115 }
116 if (good_spot == 0)
117 continue;
118
119 *minor = i;
120 j = 0;
121 dbg("%s - minor base = %d", __func__, *minor);
122 for (i = *minor; (i < (*minor + num_ports)) && (i < SERIAL_TTY_MINORS); ++i) {
123 serial_table[i] = serial;
124 serial->port[j++]->number = i;
125 }
126 mutex_unlock(&table_lock);
127 return serial;
128 }
129 mutex_unlock(&table_lock);
130 return NULL;
131 }
132
133 static void return_serial(struct usb_serial *serial)
134 {
135 int i;
136
137 dbg("%s", __func__);
138
139 mutex_lock(&table_lock);
140 for (i = 0; i < serial->num_ports; ++i)
141 serial_table[serial->minor + i] = NULL;
142 mutex_unlock(&table_lock);
143 }
144
145 static void destroy_serial(struct kref *kref)
146 {
147 struct usb_serial *serial;
148 struct usb_serial_port *port;
149 int i;
150
151 serial = to_usb_serial(kref);
152
153 dbg("%s - %s", __func__, serial->type->description);
154
155 /* return the minor range that this device had */
156 if (serial->minor != SERIAL_TTY_NO_MINOR)
157 return_serial(serial);
158
159 if (serial->attached)
160 serial->type->release(serial);
161
162 /* Now that nothing is using the ports, they can be freed */
163 for (i = 0; i < serial->num_port_pointers; ++i) {
164 port = serial->port[i];
165 if (port) {
166 port->serial = NULL;
167 put_device(&port->dev);
168 }
169 }
170
171 usb_put_dev(serial->dev);
172 kfree(serial);
173 }
174
175 void usb_serial_put(struct usb_serial *serial)
176 {
177 kref_put(&serial->kref, destroy_serial);
178 }
179
180 /*****************************************************************************
181 * Driver tty interface functions
182 *****************************************************************************/
183
184 /**
185 * serial_install - install tty
186 * @driver: the driver (USB in our case)
187 * @tty: the tty being created
188 *
189 * Create the termios objects for this tty. We use the default
190 * USB serial settings but permit them to be overridden by
191 * serial->type->init_termios.
192 *
193 * This is the first place a new tty gets used. Hence this is where we
194 * acquire references to the usb_serial structure and the driver module,
195 * where we store a pointer to the port, and where we do an autoresume.
196 * All these actions are reversed in serial_cleanup().
197 */
198 static int serial_install(struct tty_driver *driver, struct tty_struct *tty)
199 {
200 int idx = tty->index;
201 struct usb_serial *serial;
202 struct usb_serial_port *port;
203 int retval = -ENODEV;
204
205 dbg("%s", __func__);
206
207 serial = usb_serial_get_by_index(idx);
208 if (!serial)
209 return retval;
210
211 port = serial->port[idx - serial->minor];
212 if (!port)
213 goto error_no_port;
214 if (!try_module_get(serial->type->driver.owner))
215 goto error_module_get;
216
217 /* perform the standard setup */
218 retval = tty_init_termios(tty);
219 if (retval)
220 goto error_init_termios;
221
222 retval = usb_autopm_get_interface(serial->interface);
223 if (retval)
224 goto error_get_interface;
225
226 mutex_unlock(&serial->disc_mutex);
227
228 /* allow the driver to update the settings */
229 if (serial->type->init_termios)
230 serial->type->init_termios(tty);
231
232 tty->driver_data = port;
233
234 /* Final install (we use the default method) */
235 tty_driver_kref_get(driver);
236 tty->count++;
237 driver->ttys[idx] = tty;
238 return retval;
239
240 error_get_interface:
241 error_init_termios:
242 module_put(serial->type->driver.owner);
243 error_module_get:
244 error_no_port:
245 usb_serial_put(serial);
246 mutex_unlock(&serial->disc_mutex);
247 return retval;
248 }
249
250 static int serial_activate(struct tty_port *tport, struct tty_struct *tty)
251 {
252 struct usb_serial_port *port =
253 container_of(tport, struct usb_serial_port, port);
254 struct usb_serial *serial = port->serial;
255 int retval;
256
257 mutex_lock(&serial->disc_mutex);
258 if (serial->disconnected)
259 retval = -ENODEV;
260 else
261 retval = port->serial->type->open(tty, port);
262 mutex_unlock(&serial->disc_mutex);
263 return retval;
264 }
265
266 static int serial_open(struct tty_struct *tty, struct file *filp)
267 {
268 struct usb_serial_port *port = tty->driver_data;
269
270 dbg("%s - port %d", __func__, port->number);
271 return tty_port_open(&port->port, tty, filp);
272 }
273
274 /**
275 * serial_down - shut down hardware
276 * @tport: tty port to shut down
277 *
278 * Shut down a USB serial port unless it is the console. We never
279 * shut down the console hardware as it will always be in use. Serialized
280 * against activate by the tport mutex and kept to matching open/close pairs
281 * of calls by the ASYNCB_INITIALIZED flag.
282 */
283 static void serial_down(struct tty_port *tport)
284 {
285 struct usb_serial_port *port =
286 container_of(tport, struct usb_serial_port, port);
287 struct usb_serial_driver *drv = port->serial->type;
288 /*
289 * The console is magical. Do not hang up the console hardware
290 * or there will be tears.
291 */
292 if (port->port.console)
293 return;
294 if (drv->close)
295 drv->close(port);
296 }
297
298 static void serial_hangup(struct tty_struct *tty)
299 {
300 struct usb_serial_port *port = tty->driver_data;
301 dbg("%s - port %d", __func__, port->number);
302 tty_port_hangup(&port->port);
303 }
304
305 static void serial_close(struct tty_struct *tty, struct file *filp)
306 {
307 struct usb_serial_port *port = tty->driver_data;
308 dbg("%s - port %d", __func__, port->number);
309 tty_port_close(&port->port, tty, filp);
310 }
311
312 /**
313 * serial_cleanup - free resources post close/hangup
314 * @port: port to free up
315 *
316 * Do the resource freeing and refcount dropping for the port.
317 * Avoid freeing the console.
318 *
319 * Called asynchronously after the last tty kref is dropped,
320 * and the tty layer has already done the tty_shutdown(tty);
321 */
322 static void serial_cleanup(struct tty_struct *tty)
323 {
324 struct usb_serial_port *port = tty->driver_data;
325 struct usb_serial *serial;
326 struct module *owner;
327
328 /* The console is magical. Do not hang up the console hardware
329 * or there will be tears.
330 */
331 if (port->port.console)
332 return;
333
334 dbg("%s - port %d", __func__, port->number);
335
336 tty->driver_data = NULL;
337
338 serial = port->serial;
339 owner = serial->type->driver.owner;
340
341 mutex_lock(&serial->disc_mutex);
342 if (!serial->disconnected)
343 usb_autopm_put_interface(serial->interface);
344 mutex_unlock(&serial->disc_mutex);
345
346 usb_serial_put(serial);
347 module_put(owner);
348 }
349
350 static int serial_write(struct tty_struct *tty, const unsigned char *buf,
351 int count)
352 {
353 struct usb_serial_port *port = tty->driver_data;
354 int retval = -ENODEV;
355
356 if (port->serial->dev->state == USB_STATE_NOTATTACHED)
357 goto exit;
358
359 dbg("%s - port %d, %d byte(s)", __func__, port->number, count);
360
361 /* pass on to the driver specific version of this function */
362 retval = port->serial->type->write(tty, port, buf, count);
363
364 exit:
365 return retval;
366 }
367
368 static int serial_write_room(struct tty_struct *tty)
369 {
370 struct usb_serial_port *port = tty->driver_data;
371 dbg("%s - port %d", __func__, port->number);
372 /* pass on to the driver specific version of this function */
373 return port->serial->type->write_room(tty);
374 }
375
376 static int serial_chars_in_buffer(struct tty_struct *tty)
377 {
378 struct usb_serial_port *port = tty->driver_data;
379 dbg("%s - port %d", __func__, port->number);
380
381 /* if the device was unplugged then any remaining characters
382 fell out of the connector ;) */
383 if (port->serial->disconnected)
384 return 0;
385 /* pass on to the driver specific version of this function */
386 return port->serial->type->chars_in_buffer(tty);
387 }
388
389 static void serial_throttle(struct tty_struct *tty)
390 {
391 struct usb_serial_port *port = tty->driver_data;
392 dbg("%s - port %d", __func__, port->number);
393
394 /* pass on to the driver specific version of this function */
395 if (port->serial->type->throttle)
396 port->serial->type->throttle(tty);
397 }
398
399 static void serial_unthrottle(struct tty_struct *tty)
400 {
401 struct usb_serial_port *port = tty->driver_data;
402 dbg("%s - port %d", __func__, port->number);
403
404 /* pass on to the driver specific version of this function */
405 if (port->serial->type->unthrottle)
406 port->serial->type->unthrottle(tty);
407 }
408
409 static int serial_ioctl(struct tty_struct *tty, struct file *file,
410 unsigned int cmd, unsigned long arg)
411 {
412 struct usb_serial_port *port = tty->driver_data;
413 int retval = -ENODEV;
414
415 dbg("%s - port %d, cmd 0x%.4x", __func__, port->number, cmd);
416
417 /* pass on to the driver specific version of this function
418 if it is available */
419 if (port->serial->type->ioctl) {
420 retval = port->serial->type->ioctl(tty, file, cmd, arg);
421 } else
422 retval = -ENOIOCTLCMD;
423 return retval;
424 }
425
426 static void serial_set_termios(struct tty_struct *tty, struct ktermios *old)
427 {
428 struct usb_serial_port *port = tty->driver_data;
429 dbg("%s - port %d", __func__, port->number);
430
431 /* pass on to the driver specific version of this function
432 if it is available */
433 if (port->serial->type->set_termios)
434 port->serial->type->set_termios(tty, port, old);
435 else
436 tty_termios_copy_hw(tty->termios, old);
437 }
438
439 static int serial_break(struct tty_struct *tty, int break_state)
440 {
441 struct usb_serial_port *port = tty->driver_data;
442
443 dbg("%s - port %d", __func__, port->number);
444
445 /* pass on to the driver specific version of this function
446 if it is available */
447 if (port->serial->type->break_ctl)
448 port->serial->type->break_ctl(tty, break_state);
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 dbg("%s", __func__);
459 seq_puts(m, "usbserinfo:1.0 driver:2.0\n");
460 for (i = 0; i < SERIAL_TTY_MINORS; ++i) {
461 serial = usb_serial_get_by_index(i);
462 if (serial == NULL)
463 continue;
464
465 seq_printf(m, "%d:", i);
466 if (serial->type->driver.owner)
467 seq_printf(m, " module:%s",
468 module_name(serial->type->driver.owner));
469 seq_printf(m, " name:\"%s\"",
470 serial->type->description);
471 seq_printf(m, " vendor:%04x product:%04x",
472 le16_to_cpu(serial->dev->descriptor.idVendor),
473 le16_to_cpu(serial->dev->descriptor.idProduct));
474 seq_printf(m, " num_ports:%d", serial->num_ports);
475 seq_printf(m, " port:%d", i - serial->minor + 1);
476 usb_make_path(serial->dev, tmp, sizeof(tmp));
477 seq_printf(m, " path:%s", tmp);
478
479 seq_putc(m, '\n');
480 usb_serial_put(serial);
481 mutex_unlock(&serial->disc_mutex);
482 }
483 return 0;
484 }
485
486 static int serial_proc_open(struct inode *inode, struct file *file)
487 {
488 return single_open(file, serial_proc_show, NULL);
489 }
490
491 static const struct file_operations serial_proc_fops = {
492 .owner = THIS_MODULE,
493 .open = serial_proc_open,
494 .read = seq_read,
495 .llseek = seq_lseek,
496 .release = single_release,
497 };
498
499 static int serial_tiocmget(struct tty_struct *tty, struct file *file)
500 {
501 struct usb_serial_port *port = tty->driver_data;
502
503 dbg("%s - port %d", __func__, port->number);
504
505 if (port->serial->type->tiocmget)
506 return port->serial->type->tiocmget(tty, file);
507 return -EINVAL;
508 }
509
510 static int serial_tiocmset(struct tty_struct *tty, struct file *file,
511 unsigned int set, unsigned int clear)
512 {
513 struct usb_serial_port *port = tty->driver_data;
514
515 dbg("%s - port %d", __func__, port->number);
516
517 if (port->serial->type->tiocmset)
518 return port->serial->type->tiocmset(tty, file, set, clear);
519 return -EINVAL;
520 }
521
522 static int serial_get_icount(struct tty_struct *tty,
523 struct serial_icounter_struct *icount)
524 {
525 struct usb_serial_port *port = tty->driver_data;
526
527 dbg("%s - port %d", __func__, port->number);
528
529 if (port->serial->type->get_icount)
530 return port->serial->type->get_icount(tty, icount);
531 return -EINVAL;
532 }
533
534 /*
535 * We would be calling tty_wakeup here, but unfortunately some line
536 * disciplines have an annoying habit of calling tty->write from
537 * the write wakeup callback (e.g. n_hdlc.c).
538 */
539 void usb_serial_port_softint(struct usb_serial_port *port)
540 {
541 schedule_work(&port->work);
542 }
543 EXPORT_SYMBOL_GPL(usb_serial_port_softint);
544
545 static void usb_serial_port_work(struct work_struct *work)
546 {
547 struct usb_serial_port *port =
548 container_of(work, struct usb_serial_port, work);
549 struct tty_struct *tty;
550
551 dbg("%s - port %d", __func__, port->number);
552
553 tty = tty_port_tty_get(&port->port);
554 if (!tty)
555 return;
556
557 tty_wakeup(tty);
558 tty_kref_put(tty);
559 }
560
561 static void kill_traffic(struct usb_serial_port *port)
562 {
563 int i;
564
565 usb_kill_urb(port->read_urb);
566 usb_kill_urb(port->write_urb);
567 for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i)
568 usb_kill_urb(port->write_urbs[i]);
569 /*
570 * This is tricky.
571 * Some drivers submit the read_urb in the
572 * handler for the write_urb or vice versa
573 * this order determines the order in which
574 * usb_kill_urb() must be used to reliably
575 * kill the URBs. As it is unknown here,
576 * both orders must be used in turn.
577 * The call below is not redundant.
578 */
579 usb_kill_urb(port->read_urb);
580 usb_kill_urb(port->interrupt_in_urb);
581 usb_kill_urb(port->interrupt_out_urb);
582 }
583
584 static void port_release(struct device *dev)
585 {
586 struct usb_serial_port *port = to_usb_serial_port(dev);
587 int i;
588
589 dbg ("%s - %s", __func__, dev_name(dev));
590
591 /*
592 * Stop all the traffic before cancelling the work, so that
593 * nobody will restart it by calling usb_serial_port_softint.
594 */
595 kill_traffic(port);
596 cancel_work_sync(&port->work);
597
598 usb_free_urb(port->read_urb);
599 usb_free_urb(port->write_urb);
600 usb_free_urb(port->interrupt_in_urb);
601 usb_free_urb(port->interrupt_out_urb);
602 for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i) {
603 usb_free_urb(port->write_urbs[i]);
604 kfree(port->bulk_out_buffers[i]);
605 }
606 kfifo_free(&port->write_fifo);
607 kfree(port->bulk_in_buffer);
608 kfree(port->bulk_out_buffer);
609 kfree(port->interrupt_in_buffer);
610 kfree(port->interrupt_out_buffer);
611 kfree(port);
612 }
613
614 static struct usb_serial *create_serial(struct usb_device *dev,
615 struct usb_interface *interface,
616 struct usb_serial_driver *driver)
617 {
618 struct usb_serial *serial;
619
620 serial = kzalloc(sizeof(*serial), GFP_KERNEL);
621 if (!serial) {
622 dev_err(&dev->dev, "%s - out of memory\n", __func__);
623 return NULL;
624 }
625 serial->dev = usb_get_dev(dev);
626 serial->type = driver;
627 serial->interface = interface;
628 kref_init(&serial->kref);
629 mutex_init(&serial->disc_mutex);
630 serial->minor = SERIAL_TTY_NO_MINOR;
631
632 return serial;
633 }
634
635 static const struct usb_device_id *match_dynamic_id(struct usb_interface *intf,
636 struct usb_serial_driver *drv)
637 {
638 struct usb_dynid *dynid;
639
640 spin_lock(&drv->dynids.lock);
641 list_for_each_entry(dynid, &drv->dynids.list, node) {
642 if (usb_match_one_id(intf, &dynid->id)) {
643 spin_unlock(&drv->dynids.lock);
644 return &dynid->id;
645 }
646 }
647 spin_unlock(&drv->dynids.lock);
648 return NULL;
649 }
650
651 static const struct usb_device_id *get_iface_id(struct usb_serial_driver *drv,
652 struct usb_interface *intf)
653 {
654 const struct usb_device_id *id;
655
656 id = usb_match_id(intf, drv->id_table);
657 if (id) {
658 dbg("static descriptor matches");
659 goto exit;
660 }
661 id = match_dynamic_id(intf, drv);
662 if (id)
663 dbg("dynamic descriptor matches");
664 exit:
665 return id;
666 }
667
668 /* Caller must hold table_lock */
669 static struct usb_serial_driver *search_serial_device(
670 struct usb_interface *iface)
671 {
672 const struct usb_device_id *id;
673 struct usb_serial_driver *drv;
674
675 /* Check if the usb id matches a known device */
676 list_for_each_entry(drv, &usb_serial_driver_list, driver_list) {
677 id = get_iface_id(drv, iface);
678 if (id)
679 return drv;
680 }
681
682 return NULL;
683 }
684
685 static int serial_carrier_raised(struct tty_port *port)
686 {
687 struct usb_serial_port *p = container_of(port, struct usb_serial_port, port);
688 struct usb_serial_driver *drv = p->serial->type;
689 if (drv->carrier_raised)
690 return drv->carrier_raised(p);
691 /* No carrier control - don't block */
692 return 1;
693 }
694
695 static void serial_dtr_rts(struct tty_port *port, int on)
696 {
697 struct usb_serial_port *p = container_of(port, struct usb_serial_port, port);
698 struct usb_serial_driver *drv = p->serial->type;
699 if (drv->dtr_rts)
700 drv->dtr_rts(p, on);
701 }
702
703 static const struct tty_port_operations serial_port_ops = {
704 .carrier_raised = serial_carrier_raised,
705 .dtr_rts = serial_dtr_rts,
706 .activate = serial_activate,
707 .shutdown = serial_down,
708 };
709
710 int usb_serial_probe(struct usb_interface *interface,
711 const struct usb_device_id *id)
712 {
713 struct usb_device *dev = interface_to_usbdev(interface);
714 struct usb_serial *serial = NULL;
715 struct usb_serial_port *port;
716 struct usb_host_interface *iface_desc;
717 struct usb_endpoint_descriptor *endpoint;
718 struct usb_endpoint_descriptor *interrupt_in_endpoint[MAX_NUM_PORTS];
719 struct usb_endpoint_descriptor *interrupt_out_endpoint[MAX_NUM_PORTS];
720 struct usb_endpoint_descriptor *bulk_in_endpoint[MAX_NUM_PORTS];
721 struct usb_endpoint_descriptor *bulk_out_endpoint[MAX_NUM_PORTS];
722 struct usb_serial_driver *type = NULL;
723 int retval;
724 unsigned int minor;
725 int buffer_size;
726 int i;
727 int num_interrupt_in = 0;
728 int num_interrupt_out = 0;
729 int num_bulk_in = 0;
730 int num_bulk_out = 0;
731 int num_ports = 0;
732 int max_endpoints;
733
734 mutex_lock(&table_lock);
735 type = search_serial_device(interface);
736 if (!type) {
737 mutex_unlock(&table_lock);
738 dbg("none matched");
739 return -ENODEV;
740 }
741
742 if (!try_module_get(type->driver.owner)) {
743 mutex_unlock(&table_lock);
744 dev_err(&interface->dev, "module get failed, exiting\n");
745 return -EIO;
746 }
747 mutex_unlock(&table_lock);
748
749 serial = create_serial(dev, interface, type);
750 if (!serial) {
751 module_put(type->driver.owner);
752 dev_err(&interface->dev, "%s - out of memory\n", __func__);
753 return -ENOMEM;
754 }
755
756 /* if this device type has a probe function, call it */
757 if (type->probe) {
758 const struct usb_device_id *id;
759
760 id = get_iface_id(type, interface);
761 retval = type->probe(serial, id);
762
763 if (retval) {
764 dbg("sub driver rejected device");
765 kfree(serial);
766 module_put(type->driver.owner);
767 return retval;
768 }
769 }
770
771 /* descriptor matches, let's find the endpoints needed */
772 /* check out the endpoints */
773 iface_desc = interface->cur_altsetting;
774 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
775 endpoint = &iface_desc->endpoint[i].desc;
776
777 if (usb_endpoint_is_bulk_in(endpoint)) {
778 /* we found a bulk in endpoint */
779 dbg("found bulk in on endpoint %d", i);
780 bulk_in_endpoint[num_bulk_in] = endpoint;
781 ++num_bulk_in;
782 }
783
784 if (usb_endpoint_is_bulk_out(endpoint)) {
785 /* we found a bulk out endpoint */
786 dbg("found bulk out on endpoint %d", i);
787 bulk_out_endpoint[num_bulk_out] = endpoint;
788 ++num_bulk_out;
789 }
790
791 if (usb_endpoint_is_int_in(endpoint)) {
792 /* we found a interrupt in endpoint */
793 dbg("found interrupt in on endpoint %d", i);
794 interrupt_in_endpoint[num_interrupt_in] = endpoint;
795 ++num_interrupt_in;
796 }
797
798 if (usb_endpoint_is_int_out(endpoint)) {
799 /* we found an interrupt out endpoint */
800 dbg("found interrupt out on endpoint %d", i);
801 interrupt_out_endpoint[num_interrupt_out] = endpoint;
802 ++num_interrupt_out;
803 }
804 }
805
806 #if defined(CONFIG_USB_SERIAL_PL2303) || defined(CONFIG_USB_SERIAL_PL2303_MODULE)
807 /* BEGIN HORRIBLE HACK FOR PL2303 */
808 /* this is needed due to the looney way its endpoints are set up */
809 if (((le16_to_cpu(dev->descriptor.idVendor) == PL2303_VENDOR_ID) &&
810 (le16_to_cpu(dev->descriptor.idProduct) == PL2303_PRODUCT_ID)) ||
811 ((le16_to_cpu(dev->descriptor.idVendor) == ATEN_VENDOR_ID) &&
812 (le16_to_cpu(dev->descriptor.idProduct) == ATEN_PRODUCT_ID)) ||
813 ((le16_to_cpu(dev->descriptor.idVendor) == ALCOR_VENDOR_ID) &&
814 (le16_to_cpu(dev->descriptor.idProduct) == ALCOR_PRODUCT_ID)) ||
815 ((le16_to_cpu(dev->descriptor.idVendor) == SIEMENS_VENDOR_ID) &&
816 (le16_to_cpu(dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_EF81))) {
817 if (interface != dev->actconfig->interface[0]) {
818 /* check out the endpoints of the other interface*/
819 iface_desc = dev->actconfig->interface[0]->cur_altsetting;
820 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
821 endpoint = &iface_desc->endpoint[i].desc;
822 if (usb_endpoint_is_int_in(endpoint)) {
823 /* we found a interrupt in endpoint */
824 dbg("found interrupt in for Prolific device on separate interface");
825 interrupt_in_endpoint[num_interrupt_in] = endpoint;
826 ++num_interrupt_in;
827 }
828 }
829 }
830
831 /* Now make sure the PL-2303 is configured correctly.
832 * If not, give up now and hope this hack will work
833 * properly during a later invocation of usb_serial_probe
834 */
835 if (num_bulk_in == 0 || num_bulk_out == 0) {
836 dev_info(&interface->dev, "PL-2303 hack: descriptors matched but endpoints did not\n");
837 kfree(serial);
838 module_put(type->driver.owner);
839 return -ENODEV;
840 }
841 }
842 /* END HORRIBLE HACK FOR PL2303 */
843 #endif
844
845 #ifdef CONFIG_USB_SERIAL_GENERIC
846 if (type == &usb_serial_generic_device) {
847 num_ports = num_bulk_out;
848 if (num_ports == 0) {
849 dev_err(&interface->dev,
850 "Generic device with no bulk out, not allowed.\n");
851 kfree(serial);
852 module_put(type->driver.owner);
853 return -EIO;
854 }
855 }
856 #endif
857 if (!num_ports) {
858 /* if this device type has a calc_num_ports function, call it */
859 if (type->calc_num_ports)
860 num_ports = type->calc_num_ports(serial);
861 if (!num_ports)
862 num_ports = type->num_ports;
863 }
864
865 serial->num_ports = num_ports;
866 serial->num_bulk_in = num_bulk_in;
867 serial->num_bulk_out = num_bulk_out;
868 serial->num_interrupt_in = num_interrupt_in;
869 serial->num_interrupt_out = num_interrupt_out;
870
871 /* found all that we need */
872 dev_info(&interface->dev, "%s converter detected\n",
873 type->description);
874
875 /* create our ports, we need as many as the max endpoints */
876 /* we don't use num_ports here because some devices have more
877 endpoint pairs than ports */
878 max_endpoints = max(num_bulk_in, num_bulk_out);
879 max_endpoints = max(max_endpoints, num_interrupt_in);
880 max_endpoints = max(max_endpoints, num_interrupt_out);
881 max_endpoints = max(max_endpoints, (int)serial->num_ports);
882 serial->num_port_pointers = max_endpoints;
883
884 dbg("%s - setting up %d port structures for this device",
885 __func__, 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 = &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 port->read_urb = usb_alloc_urb(0, GFP_KERNEL);
910 if (!port->read_urb) {
911 dev_err(&interface->dev, "No free urbs available\n");
912 goto probe_error;
913 }
914 buffer_size = serial->type->bulk_in_size;
915 if (!buffer_size)
916 buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
917 port->bulk_in_size = buffer_size;
918 port->bulk_in_endpointAddress = endpoint->bEndpointAddress;
919 port->bulk_in_buffer = kmalloc(buffer_size, GFP_KERNEL);
920 if (!port->bulk_in_buffer) {
921 dev_err(&interface->dev,
922 "Couldn't allocate bulk_in_buffer\n");
923 goto probe_error;
924 }
925 usb_fill_bulk_urb(port->read_urb, dev,
926 usb_rcvbulkpipe(dev,
927 endpoint->bEndpointAddress),
928 port->bulk_in_buffer, buffer_size,
929 serial->type->read_bulk_callback, port);
930 }
931
932 for (i = 0; i < num_bulk_out; ++i) {
933 int j;
934
935 endpoint = bulk_out_endpoint[i];
936 port = serial->port[i];
937 port->write_urb = usb_alloc_urb(0, GFP_KERNEL);
938 if (!port->write_urb) {
939 dev_err(&interface->dev, "No free urbs available\n");
940 goto probe_error;
941 }
942 if (kfifo_alloc(&port->write_fifo, PAGE_SIZE, GFP_KERNEL))
943 goto probe_error;
944 buffer_size = serial->type->bulk_out_size;
945 if (!buffer_size)
946 buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
947 port->bulk_out_size = buffer_size;
948 port->bulk_out_endpointAddress = endpoint->bEndpointAddress;
949 port->bulk_out_buffer = kmalloc(buffer_size, GFP_KERNEL);
950 if (!port->bulk_out_buffer) {
951 dev_err(&interface->dev,
952 "Couldn't allocate bulk_out_buffer\n");
953 goto probe_error;
954 }
955 usb_fill_bulk_urb(port->write_urb, dev,
956 usb_sndbulkpipe(dev,
957 endpoint->bEndpointAddress),
958 port->bulk_out_buffer, buffer_size,
959 serial->type->write_bulk_callback, port);
960 for (j = 0; j < ARRAY_SIZE(port->write_urbs); ++j) {
961 set_bit(j, &port->write_urbs_free);
962 port->write_urbs[j] = usb_alloc_urb(0, GFP_KERNEL);
963 if (!port->write_urbs[j]) {
964 dev_err(&interface->dev,
965 "No free urbs available\n");
966 goto probe_error;
967 }
968 port->bulk_out_buffers[j] = kmalloc(buffer_size,
969 GFP_KERNEL);
970 if (!port->bulk_out_buffers[j]) {
971 dev_err(&interface->dev,
972 "Couldn't allocate bulk_out_buffer\n");
973 goto probe_error;
974 }
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
984 if (serial->type->read_int_callback) {
985 for (i = 0; i < num_interrupt_in; ++i) {
986 endpoint = interrupt_in_endpoint[i];
987 port = serial->port[i];
988 port->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
989 if (!port->interrupt_in_urb) {
990 dev_err(&interface->dev,
991 "No free urbs available\n");
992 goto probe_error;
993 }
994 buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
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 dev_err(&interface->dev,
1001 "Couldn't allocate interrupt_in_buffer\n");
1002 goto probe_error;
1003 }
1004 usb_fill_int_urb(port->interrupt_in_urb, dev,
1005 usb_rcvintpipe(dev,
1006 endpoint->bEndpointAddress),
1007 port->interrupt_in_buffer, buffer_size,
1008 serial->type->read_int_callback, port,
1009 endpoint->bInterval);
1010 }
1011 } else if (num_interrupt_in) {
1012 dbg("the device claims to support interrupt in transfers, but read_int_callback is not defined");
1013 }
1014
1015 if (serial->type->write_int_callback) {
1016 for (i = 0; i < num_interrupt_out; ++i) {
1017 endpoint = interrupt_out_endpoint[i];
1018 port = serial->port[i];
1019 port->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
1020 if (!port->interrupt_out_urb) {
1021 dev_err(&interface->dev,
1022 "No free urbs available\n");
1023 goto probe_error;
1024 }
1025 buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
1026 port->interrupt_out_size = buffer_size;
1027 port->interrupt_out_endpointAddress =
1028 endpoint->bEndpointAddress;
1029 port->interrupt_out_buffer = kmalloc(buffer_size,
1030 GFP_KERNEL);
1031 if (!port->interrupt_out_buffer) {
1032 dev_err(&interface->dev,
1033 "Couldn't allocate interrupt_out_buffer\n");
1034 goto probe_error;
1035 }
1036 usb_fill_int_urb(port->interrupt_out_urb, dev,
1037 usb_sndintpipe(dev,
1038 endpoint->bEndpointAddress),
1039 port->interrupt_out_buffer, buffer_size,
1040 serial->type->write_int_callback, port,
1041 endpoint->bInterval);
1042 }
1043 } else if (num_interrupt_out) {
1044 dbg("the device claims to support interrupt out transfers, but write_int_callback is not defined");
1045 }
1046
1047 /* if this device type has an attach function, call it */
1048 if (type->attach) {
1049 retval = type->attach(serial);
1050 if (retval < 0)
1051 goto probe_error;
1052 serial->attached = 1;
1053 if (retval > 0) {
1054 /* quietly accept this device, but don't bind to a
1055 serial port as it's about to disappear */
1056 serial->num_ports = 0;
1057 goto exit;
1058 }
1059 } else {
1060 serial->attached = 1;
1061 }
1062
1063 if (get_free_serial(serial, num_ports, &minor) == NULL) {
1064 dev_err(&interface->dev, "No more free serial devices\n");
1065 goto probe_error;
1066 }
1067 serial->minor = minor;
1068
1069 /* register all of the individual ports with the driver core */
1070 for (i = 0; i < num_ports; ++i) {
1071 port = serial->port[i];
1072 dev_set_name(&port->dev, "ttyUSB%d", port->number);
1073 dbg ("%s - registering %s", __func__, dev_name(&port->dev));
1074 port->dev_state = PORT_REGISTERING;
1075 device_enable_async_suspend(&port->dev);
1076
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 module_put(type->driver.owner);
1093 return 0;
1094
1095 probe_error:
1096 usb_serial_put(serial);
1097 module_put(type->driver.owner);
1098 return -EIO;
1099 }
1100 EXPORT_SYMBOL_GPL(usb_serial_probe);
1101
1102 void usb_serial_disconnect(struct usb_interface *interface)
1103 {
1104 int i;
1105 struct usb_serial *serial = usb_get_intfdata(interface);
1106 struct device *dev = &interface->dev;
1107 struct usb_serial_port *port;
1108
1109 usb_serial_console_disconnect(serial);
1110 dbg("%s", __func__);
1111
1112 mutex_lock(&serial->disc_mutex);
1113 usb_set_intfdata(interface, NULL);
1114 /* must set a flag, to signal subdrivers */
1115 serial->disconnected = 1;
1116 mutex_unlock(&serial->disc_mutex);
1117
1118 for (i = 0; i < serial->num_ports; ++i) {
1119 port = serial->port[i];
1120 if (port) {
1121 struct tty_struct *tty = tty_port_tty_get(&port->port);
1122 if (tty) {
1123 tty_vhangup(tty);
1124 tty_kref_put(tty);
1125 }
1126 kill_traffic(port);
1127 cancel_work_sync(&port->work);
1128 if (port->dev_state == PORT_REGISTERED) {
1129
1130 /* Make sure the port is bound so that the
1131 * driver's port_remove method is called.
1132 */
1133 if (!port->dev.driver) {
1134 int rc;
1135
1136 port->dev.driver =
1137 &serial->type->driver;
1138 rc = device_bind_driver(&port->dev);
1139 }
1140 port->dev_state = PORT_UNREGISTERING;
1141 device_del(&port->dev);
1142 port->dev_state = PORT_UNREGISTERED;
1143 }
1144 }
1145 }
1146 serial->type->disconnect(serial);
1147
1148 /* let the last holder of this object cause it to be cleaned up */
1149 usb_serial_put(serial);
1150 dev_info(dev, "device disconnected\n");
1151 }
1152 EXPORT_SYMBOL_GPL(usb_serial_disconnect);
1153
1154 int usb_serial_suspend(struct usb_interface *intf, pm_message_t message)
1155 {
1156 struct usb_serial *serial = usb_get_intfdata(intf);
1157 struct usb_serial_port *port;
1158 int i, r = 0;
1159
1160 serial->suspending = 1;
1161
1162 if (serial->type->suspend) {
1163 r = serial->type->suspend(serial, message);
1164 if (r < 0) {
1165 serial->suspending = 0;
1166 goto err_out;
1167 }
1168 }
1169
1170 for (i = 0; i < serial->num_ports; ++i) {
1171 port = serial->port[i];
1172 if (port)
1173 kill_traffic(port);
1174 }
1175
1176 err_out:
1177 return r;
1178 }
1179 EXPORT_SYMBOL(usb_serial_suspend);
1180
1181 int usb_serial_resume(struct usb_interface *intf)
1182 {
1183 struct usb_serial *serial = usb_get_intfdata(intf);
1184 int rv;
1185
1186 serial->suspending = 0;
1187 if (serial->type->resume)
1188 rv = serial->type->resume(serial);
1189 else
1190 rv = usb_serial_generic_resume(serial);
1191
1192 return rv;
1193 }
1194 EXPORT_SYMBOL(usb_serial_resume);
1195
1196 static const struct tty_operations serial_ops = {
1197 .open = serial_open,
1198 .close = serial_close,
1199 .write = serial_write,
1200 .hangup = serial_hangup,
1201 .write_room = serial_write_room,
1202 .ioctl = serial_ioctl,
1203 .set_termios = serial_set_termios,
1204 .throttle = serial_throttle,
1205 .unthrottle = serial_unthrottle,
1206 .break_ctl = serial_break,
1207 .chars_in_buffer = serial_chars_in_buffer,
1208 .tiocmget = serial_tiocmget,
1209 .tiocmset = serial_tiocmset,
1210 .get_icount = serial_get_icount,
1211 .cleanup = serial_cleanup,
1212 .install = serial_install,
1213 .proc_fops = &serial_proc_fops,
1214 };
1215
1216
1217 struct tty_driver *usb_serial_tty_driver;
1218
1219 static int __init usb_serial_init(void)
1220 {
1221 int i;
1222 int result;
1223
1224 usb_serial_tty_driver = alloc_tty_driver(SERIAL_TTY_MINORS);
1225 if (!usb_serial_tty_driver)
1226 return -ENOMEM;
1227
1228 /* Initialize our global data */
1229 for (i = 0; i < SERIAL_TTY_MINORS; ++i)
1230 serial_table[i] = NULL;
1231
1232 result = bus_register(&usb_serial_bus_type);
1233 if (result) {
1234 printk(KERN_ERR "usb-serial: %s - registering bus driver "
1235 "failed\n", __func__);
1236 goto exit_bus;
1237 }
1238
1239 usb_serial_tty_driver->owner = THIS_MODULE;
1240 usb_serial_tty_driver->driver_name = "usbserial";
1241 usb_serial_tty_driver->name = "ttyUSB";
1242 usb_serial_tty_driver->major = SERIAL_TTY_MAJOR;
1243 usb_serial_tty_driver->minor_start = 0;
1244 usb_serial_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
1245 usb_serial_tty_driver->subtype = SERIAL_TYPE_NORMAL;
1246 usb_serial_tty_driver->flags = TTY_DRIVER_REAL_RAW |
1247 TTY_DRIVER_DYNAMIC_DEV;
1248 usb_serial_tty_driver->init_termios = tty_std_termios;
1249 usb_serial_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD
1250 | HUPCL | CLOCAL;
1251 usb_serial_tty_driver->init_termios.c_ispeed = 9600;
1252 usb_serial_tty_driver->init_termios.c_ospeed = 9600;
1253 tty_set_operations(usb_serial_tty_driver, &serial_ops);
1254 result = tty_register_driver(usb_serial_tty_driver);
1255 if (result) {
1256 printk(KERN_ERR "usb-serial: %s - tty_register_driver failed\n",
1257 __func__);
1258 goto exit_reg_driver;
1259 }
1260
1261 /* register the USB driver */
1262 result = usb_register(&usb_serial_driver);
1263 if (result < 0) {
1264 printk(KERN_ERR "usb-serial: %s - usb_register failed\n",
1265 __func__);
1266 goto exit_tty;
1267 }
1268
1269 /* register the generic driver, if we should */
1270 result = usb_serial_generic_register(debug);
1271 if (result < 0) {
1272 printk(KERN_ERR "usb-serial: %s - registering generic "
1273 "driver failed\n", __func__);
1274 goto exit_generic;
1275 }
1276
1277 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1278
1279 return result;
1280
1281 exit_generic:
1282 usb_deregister(&usb_serial_driver);
1283
1284 exit_tty:
1285 tty_unregister_driver(usb_serial_tty_driver);
1286
1287 exit_reg_driver:
1288 bus_unregister(&usb_serial_bus_type);
1289
1290 exit_bus:
1291 printk(KERN_ERR "usb-serial: %s - returning with error %d\n",
1292 __func__, result);
1293 put_tty_driver(usb_serial_tty_driver);
1294 return result;
1295 }
1296
1297
1298 static void __exit usb_serial_exit(void)
1299 {
1300 usb_serial_console_exit();
1301
1302 usb_serial_generic_deregister();
1303
1304 usb_deregister(&usb_serial_driver);
1305 tty_unregister_driver(usb_serial_tty_driver);
1306 put_tty_driver(usb_serial_tty_driver);
1307 bus_unregister(&usb_serial_bus_type);
1308 }
1309
1310
1311 module_init(usb_serial_init);
1312 module_exit(usb_serial_exit);
1313
1314 #define set_to_generic_if_null(type, function) \
1315 do { \
1316 if (!type->function) { \
1317 type->function = usb_serial_generic_##function; \
1318 dbg("Had to override the " #function \
1319 " usb serial operation with the generic one.");\
1320 } \
1321 } while (0)
1322
1323 static void fixup_generic(struct usb_serial_driver *device)
1324 {
1325 set_to_generic_if_null(device, open);
1326 set_to_generic_if_null(device, write);
1327 set_to_generic_if_null(device, close);
1328 set_to_generic_if_null(device, write_room);
1329 set_to_generic_if_null(device, chars_in_buffer);
1330 set_to_generic_if_null(device, read_bulk_callback);
1331 set_to_generic_if_null(device, write_bulk_callback);
1332 set_to_generic_if_null(device, disconnect);
1333 set_to_generic_if_null(device, release);
1334 set_to_generic_if_null(device, process_read_urb);
1335 set_to_generic_if_null(device, prepare_write_buffer);
1336 }
1337
1338 int usb_serial_register(struct usb_serial_driver *driver)
1339 {
1340 /* must be called with BKL held */
1341 int retval;
1342
1343 if (usb_disabled())
1344 return -ENODEV;
1345
1346 fixup_generic(driver);
1347
1348 if (!driver->description)
1349 driver->description = driver->driver.name;
1350 if (!driver->usb_driver) {
1351 WARN(1, "Serial driver %s has no usb_driver\n",
1352 driver->description);
1353 return -EINVAL;
1354 }
1355 driver->usb_driver->supports_autosuspend = 1;
1356
1357 /* Add this device to our list of devices */
1358 mutex_lock(&table_lock);
1359 list_add(&driver->driver_list, &usb_serial_driver_list);
1360
1361 retval = usb_serial_bus_register(driver);
1362 if (retval) {
1363 printk(KERN_ERR "usb-serial: problem %d when registering "
1364 "driver %s\n", retval, driver->description);
1365 list_del(&driver->driver_list);
1366 } else
1367 printk(KERN_INFO "USB Serial support registered for %s\n",
1368 driver->description);
1369
1370 mutex_unlock(&table_lock);
1371 return retval;
1372 }
1373 EXPORT_SYMBOL_GPL(usb_serial_register);
1374
1375
1376 void usb_serial_deregister(struct usb_serial_driver *device)
1377 {
1378 /* must be called with BKL held */
1379 printk(KERN_INFO "USB Serial deregistering driver %s\n",
1380 device->description);
1381 mutex_lock(&table_lock);
1382 list_del(&device->driver_list);
1383 usb_serial_bus_deregister(device);
1384 mutex_unlock(&table_lock);
1385 }
1386 EXPORT_SYMBOL_GPL(usb_serial_deregister);
1387
1388 /* Module information */
1389 MODULE_AUTHOR(DRIVER_AUTHOR);
1390 MODULE_DESCRIPTION(DRIVER_DESC);
1391 MODULE_LICENSE("GPL");
1392
1393 module_param(debug, bool, S_IRUGO | S_IWUSR);
1394 MODULE_PARM_DESC(debug, "Debug enabled or not");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree