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[PATCH] UFS: inode->i_sem is not released in error path
[linux-2.6/verdex.git] / drivers / usb / serial / ir-usb.c
bloba59010421444b9419bd0e3990f87cf8b2dd9edf5
1 /*
2 * USB IR Dongle driver
3 *
4 * Copyright (C) 2001-2002 Greg Kroah-Hartman (greg@kroah.com)
5 * Copyright (C) 2002 Gary Brubaker (xavyer@ix.netcom.com)
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This driver allows a USB IrDA device to be used as a "dumb" serial device.
13 * This can be useful if you do not have access to a full IrDA stack on the
14 * other side of the connection. If you do have an IrDA stack on both devices,
15 * please use the usb-irda driver, as it contains the proper error checking and
16 * other goodness of a full IrDA stack.
17 *
18 * Portions of this driver were taken from drivers/net/irda/irda-usb.c, which
19 * was written by Roman Weissgaerber <weissg@vienna.at>, Dag Brattli
20 * <dag@brattli.net>, and Jean Tourrilhes <jt@hpl.hp.com>
21 *
22 * See Documentation/usb/usb-serial.txt for more information on using this driver
23 *
24 * 2002_Mar_07 greg kh
25 * moved some needed structures and #define values from the
26 * net/irda/irda-usb.h file into our file, as we don't want to depend on
27 * that codebase compiling correctly :)
28 *
29 * 2002_Jan_14 gb
30 * Added module parameter to force specific number of XBOFs.
31 * Added ir_xbof_change().
32 * Reorganized read_bulk_callback error handling.
33 * Switched from FILL_BULK_URB() to usb_fill_bulk_urb().
34 *
35 * 2001_Nov_08 greg kh
36 * Changed the irda_usb_find_class_desc() function based on comments and
37 * code from Martin Diehl.
38 *
39 * 2001_Nov_01 greg kh
40 * Added support for more IrDA USB devices.
41 * Added support for zero packet. Added buffer override paramater, so
42 * users can transfer larger packets at once if they wish. Both patches
43 * came from Dag Brattli <dag@obexcode.com>.
44 *
45 * 2001_Oct_07 greg kh
46 * initial version released.
47 */
48
49 #include <linux/config.h>
50 #include <linux/kernel.h>
51 #include <linux/errno.h>
52 #include <linux/init.h>
53 #include <linux/slab.h>
54 #include <linux/tty.h>
55 #include <linux/tty_driver.h>
56 #include <linux/tty_flip.h>
57 #include <linux/module.h>
58 #include <linux/spinlock.h>
59 #include <asm/uaccess.h>
60 #include <linux/usb.h>
61 #include "usb-serial.h"
62
63 /*
64 * Version Information
65 */
66 #define DRIVER_VERSION "v0.4"
67 #define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>"
68 #define DRIVER_DESC "USB IR Dongle driver"
69
70 /* USB IrDA class spec information */
71 #define USB_CLASS_IRDA 0x02
72 #define USB_DT_IRDA 0x21
73 #define IU_REQ_GET_CLASS_DESC 0x06
74 #define SPEED_2400 0x01
75 #define SPEED_9600 0x02
76 #define SPEED_19200 0x03
77 #define SPEED_38400 0x04
78 #define SPEED_57600 0x05
79 #define SPEED_115200 0x06
80 #define SPEED_576000 0x07
81 #define SPEED_1152000 0x08
82 #define SPEED_4000000 0x09
83
84 struct irda_class_desc {
85 u8 bLength;
86 u8 bDescriptorType;
87 u16 bcdSpecRevision;
88 u8 bmDataSize;
89 u8 bmWindowSize;
90 u8 bmMinTurnaroundTime;
91 u16 wBaudRate;
92 u8 bmAdditionalBOFs;
93 u8 bIrdaRateSniff;
94 u8 bMaxUnicastList;
95 } __attribute__ ((packed));
96
97 static int debug;
98
99 /* if overridden by the user, then use their value for the size of the read and
100 * write urbs */
101 static int buffer_size;
102 /* if overridden by the user, then use the specified number of XBOFs */
103 static int xbof = -1;
104
105 static int ir_startup (struct usb_serial *serial);
106 static int ir_open (struct usb_serial_port *port, struct file *filep);
107 static void ir_close (struct usb_serial_port *port, struct file *filep);
108 static int ir_write (struct usb_serial_port *port, const unsigned char *buf, int count);
109 static void ir_write_bulk_callback (struct urb *urb, struct pt_regs *regs);
110 static void ir_read_bulk_callback (struct urb *urb, struct pt_regs *regs);
111 static void ir_set_termios (struct usb_serial_port *port, struct termios *old_termios);
112
113 static u8 ir_baud = 0;
114 static u8 ir_xbof = 0;
115 static u8 ir_add_bof = 0;
116
117 static struct usb_device_id id_table [] = {
118 { USB_DEVICE(0x050f, 0x0180) }, /* KC Technology, KC-180 */
119 { USB_DEVICE(0x08e9, 0x0100) }, /* XTNDAccess */
120 { USB_DEVICE(0x09c4, 0x0011) }, /* ACTiSys ACT-IR2000U */
121 { USB_INTERFACE_INFO (USB_CLASS_APP_SPEC, USB_CLASS_IRDA, 0) },
122 { } /* Terminating entry */
123 };
124
125 MODULE_DEVICE_TABLE (usb, id_table);
126
127 static struct usb_driver ir_driver = {
128 .name = "ir-usb",
129 .probe = usb_serial_probe,
130 .disconnect = usb_serial_disconnect,
131 .id_table = id_table,
132 .no_dynamic_id = 1,
133 };
134
135
136 static struct usb_serial_driver ir_device = {
137 .driver = {
138 .owner = THIS_MODULE,
139 .name = "ir-usb",
140 },
141 .description = "IR Dongle",
142 .id_table = id_table,
143 .num_interrupt_in = 1,
144 .num_bulk_in = 1,
145 .num_bulk_out = 1,
146 .num_ports = 1,
147 .set_termios = ir_set_termios,
148 .attach = ir_startup,
149 .open = ir_open,
150 .close = ir_close,
151 .write = ir_write,
152 .write_bulk_callback = ir_write_bulk_callback,
153 .read_bulk_callback = ir_read_bulk_callback,
154 };
155
156 static inline void irda_usb_dump_class_desc(struct irda_class_desc *desc)
157 {
158 dbg("bLength=%x", desc->bLength);
159 dbg("bDescriptorType=%x", desc->bDescriptorType);
160 dbg("bcdSpecRevision=%x", desc->bcdSpecRevision);
161 dbg("bmDataSize=%x", desc->bmDataSize);
162 dbg("bmWindowSize=%x", desc->bmWindowSize);
163 dbg("bmMinTurnaroundTime=%d", desc->bmMinTurnaroundTime);
164 dbg("wBaudRate=%x", desc->wBaudRate);
165 dbg("bmAdditionalBOFs=%x", desc->bmAdditionalBOFs);
166 dbg("bIrdaRateSniff=%x", desc->bIrdaRateSniff);
167 dbg("bMaxUnicastList=%x", desc->bMaxUnicastList);
168 }
169
170 /*------------------------------------------------------------------*/
171 /*
172 * Function irda_usb_find_class_desc(dev, ifnum)
173 *
174 * Returns instance of IrDA class descriptor, or NULL if not found
175 *
176 * The class descriptor is some extra info that IrDA USB devices will
177 * offer to us, describing their IrDA characteristics. We will use that in
178 * irda_usb_init_qos()
179 *
180 * Based on the same function in drivers/net/irda/irda-usb.c
181 */
182 static struct irda_class_desc *irda_usb_find_class_desc(struct usb_device *dev, unsigned int ifnum)
183 {
184 struct irda_class_desc *desc;
185 int ret;
186
187 desc = kmalloc(sizeof (struct irda_class_desc), GFP_KERNEL);
188 if (desc == NULL)
189 return NULL;
190 memset(desc, 0, sizeof(struct irda_class_desc));
191
192 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev,0),
193 IU_REQ_GET_CLASS_DESC,
194 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
195 0, ifnum, desc, sizeof(*desc), 1000);
196
197 dbg("%s - ret=%d", __FUNCTION__, ret);
198 if (ret < sizeof(*desc)) {
199 dbg("%s - class descriptor read %s (%d)",
200 __FUNCTION__,
201 (ret<0) ? "failed" : "too short",
202 ret);
203 goto error;
204 }
205 if (desc->bDescriptorType != USB_DT_IRDA) {
206 dbg("%s - bad class descriptor type", __FUNCTION__);
207 goto error;
208 }
209
210 irda_usb_dump_class_desc(desc);
211 return desc;
212 error:
213 kfree(desc);
214 return NULL;
215 }
216
217
218 static u8 ir_xbof_change(u8 xbof)
219 {
220 u8 result;
221 /* reference irda-usb.c */
222 switch(xbof) {
223 case 48: result = 0x10; break;
224 case 28:
225 case 24: result = 0x20; break;
226 default:
227 case 12: result = 0x30; break;
228 case 5:
229 case 6: result = 0x40; break;
230 case 3: result = 0x50; break;
231 case 2: result = 0x60; break;
232 case 1: result = 0x70; break;
233 case 0: result = 0x80; break;
234 }
235 return(result);
236 }
237
238
239 static int ir_startup (struct usb_serial *serial)
240 {
241 struct irda_class_desc *irda_desc;
242
243 irda_desc = irda_usb_find_class_desc (serial->dev, 0);
244 if (irda_desc == NULL) {
245 dev_err (&serial->dev->dev, "IRDA class descriptor not found, device not bound\n");
246 return -ENODEV;
247 }
248
249 dbg ("%s - Baud rates supported:%s%s%s%s%s%s%s%s%s",
250 __FUNCTION__,
251 (irda_desc->wBaudRate & 0x0001) ? " 2400" : "",
252 (irda_desc->wBaudRate & 0x0002) ? " 9600" : "",
253 (irda_desc->wBaudRate & 0x0004) ? " 19200" : "",
254 (irda_desc->wBaudRate & 0x0008) ? " 38400" : "",
255 (irda_desc->wBaudRate & 0x0010) ? " 57600" : "",
256 (irda_desc->wBaudRate & 0x0020) ? " 115200" : "",
257 (irda_desc->wBaudRate & 0x0040) ? " 576000" : "",
258 (irda_desc->wBaudRate & 0x0080) ? " 1152000" : "",
259 (irda_desc->wBaudRate & 0x0100) ? " 4000000" : "");
260
261 switch( irda_desc->bmAdditionalBOFs ) {
262 case 0x01: ir_add_bof = 48; break;
263 case 0x02: ir_add_bof = 24; break;
264 case 0x04: ir_add_bof = 12; break;
265 case 0x08: ir_add_bof = 6; break;
266 case 0x10: ir_add_bof = 3; break;
267 case 0x20: ir_add_bof = 2; break;
268 case 0x40: ir_add_bof = 1; break;
269 case 0x80: ir_add_bof = 0; break;
270 default:;
271 }
272
273 kfree (irda_desc);
274
275 return 0;
276 }
277
278 static int ir_open (struct usb_serial_port *port, struct file *filp)
279 {
280 char *buffer;
281 int result = 0;
282
283 dbg("%s - port %d", __FUNCTION__, port->number);
284
285 if (buffer_size) {
286 /* override the default buffer sizes */
287 buffer = kmalloc (buffer_size, GFP_KERNEL);
288 if (!buffer) {
289 dev_err (&port->dev, "%s - out of memory.\n", __FUNCTION__);
290 return -ENOMEM;
291 }
292 kfree (port->read_urb->transfer_buffer);
293 port->read_urb->transfer_buffer = buffer;
294 port->read_urb->transfer_buffer_length = buffer_size;
295
296 buffer = kmalloc (buffer_size, GFP_KERNEL);
297 if (!buffer) {
298 dev_err (&port->dev, "%s - out of memory.\n", __FUNCTION__);
299 return -ENOMEM;
300 }
301 kfree (port->write_urb->transfer_buffer);
302 port->write_urb->transfer_buffer = buffer;
303 port->write_urb->transfer_buffer_length = buffer_size;
304 port->bulk_out_size = buffer_size;
305 }
306
307 /* Start reading from the device */
308 usb_fill_bulk_urb (
309 port->read_urb,
310 port->serial->dev,
311 usb_rcvbulkpipe(port->serial->dev, port->bulk_in_endpointAddress),
312 port->read_urb->transfer_buffer,
313 port->read_urb->transfer_buffer_length,
314 ir_read_bulk_callback,
315 port);
316 result = usb_submit_urb(port->read_urb, GFP_KERNEL);
317 if (result)
318 dev_err(&port->dev, "%s - failed submitting read urb, error %d\n", __FUNCTION__, result);
319
320 return result;
321 }
322
323 static void ir_close (struct usb_serial_port *port, struct file * filp)
324 {
325 dbg("%s - port %d", __FUNCTION__, port->number);
326
327 /* shutdown our bulk read */
328 usb_kill_urb(port->read_urb);
329 }
330
331 static int ir_write (struct usb_serial_port *port, const unsigned char *buf, int count)
332 {
333 unsigned char *transfer_buffer;
334 int result;
335 int transfer_size;
336
337 dbg("%s - port = %d, count = %d", __FUNCTION__, port->number, count);
338
339 if (!port->tty) {
340 dev_err (&port->dev, "%s - no tty???\n", __FUNCTION__);
341 return 0;
342 }
343
344 if (count == 0)
345 return 0;
346
347 spin_lock(&port->lock);
348 if (port->write_urb_busy) {
349 spin_unlock(&port->lock);
350 dbg("%s - already writing", __FUNCTION__);
351 return 0;
352 }
353 port->write_urb_busy = 1;
354 spin_unlock(&port->lock);
355
356 transfer_buffer = port->write_urb->transfer_buffer;
357 transfer_size = min(count, port->bulk_out_size - 1);
358
359 /*
360 * The first byte of the packet we send to the device contains an
361 * inband header which indicates an additional number of BOFs and
362 * a baud rate change.
363 *
364 * See section 5.4.2.2 of the USB IrDA spec.
365 */
366 *transfer_buffer = ir_xbof | ir_baud;
367 ++transfer_buffer;
368
369 memcpy (transfer_buffer, buf, transfer_size);
370
371 usb_fill_bulk_urb (
372 port->write_urb,
373 port->serial->dev,
374 usb_sndbulkpipe(port->serial->dev,
375 port->bulk_out_endpointAddress),
376 port->write_urb->transfer_buffer,
377 transfer_size + 1,
378 ir_write_bulk_callback,
379 port);
380
381 port->write_urb->transfer_flags = URB_ZERO_PACKET;
382
383 result = usb_submit_urb (port->write_urb, GFP_ATOMIC);
384 if (result) {
385 port->write_urb_busy = 0;
386 dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result);
387 } else
388 result = transfer_size;
389
390 return result;
391 }
392
393 static void ir_write_bulk_callback (struct urb *urb, struct pt_regs *regs)
394 {
395 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
396
397 dbg("%s - port %d", __FUNCTION__, port->number);
398
399 port->write_urb_busy = 0;
400 if (urb->status) {
401 dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
402 return;
403 }
404
405 usb_serial_debug_data (
406 debug,
407 &port->dev,
408 __FUNCTION__,
409 urb->actual_length,
410 urb->transfer_buffer);
411
412 schedule_work(&port->work);
413 }
414
415 static void ir_read_bulk_callback (struct urb *urb, struct pt_regs *regs)
416 {
417 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
418 struct tty_struct *tty;
419 unsigned char *data = urb->transfer_buffer;
420 int result;
421
422 dbg("%s - port %d", __FUNCTION__, port->number);
423
424 if (!port->open_count) {
425 dbg("%s - port closed.", __FUNCTION__);
426 return;
427 }
428
429 switch (urb->status) {
430
431 case 0: /* Successful */
432
433 /*
434 * The first byte of the packet we get from the device
435 * contains a busy indicator and baud rate change.
436 * See section 5.4.1.2 of the USB IrDA spec.
437 */
438 if ((*data & 0x0f) > 0)
439 ir_baud = *data & 0x0f;
440
441 usb_serial_debug_data (
442 debug,
443 &port->dev,
444 __FUNCTION__,
445 urb->actual_length,
446 data);
447
448 /*
449 * Bypass flip-buffers, and feed the ldisc directly
450 * due to our potentially large buffer size. Since we
451 * used to set low_latency, this is exactly what the
452 * tty layer did anyway :)
453 */
454 tty = port->tty;
455
456 /*
457 * FIXME: must not do this in IRQ context,
458 * must honour TTY_DONT_FLIP
459 */
460 tty->ldisc.receive_buf(
461 tty,
462 data+1,
463 NULL,
464 urb->actual_length-1);
465
466 /*
467 * No break here.
468 * We want to resubmit the urb so we can read
469 * again.
470 */
471
472 case -EPROTO: /* taking inspiration from pl2303.c */
473
474 /* Continue trying to always read */
475 usb_fill_bulk_urb (
476 port->read_urb,
477 port->serial->dev,
478 usb_rcvbulkpipe(port->serial->dev,
479 port->bulk_in_endpointAddress),
480 port->read_urb->transfer_buffer,
481 port->read_urb->transfer_buffer_length,
482 ir_read_bulk_callback,
483 port);
484
485 result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
486 if (result)
487 dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n",
488 __FUNCTION__, result);
489
490 break ;
491
492 default:
493 dbg("%s - nonzero read bulk status received: %d",
494 __FUNCTION__,
495 urb->status);
496 break ;
497
498 }
499
500 return;
501 }
502
503 static void ir_set_termios (struct usb_serial_port *port, struct termios *old_termios)
504 {
505 unsigned char *transfer_buffer;
506 unsigned int cflag;
507 int result;
508
509 dbg("%s - port %d", __FUNCTION__, port->number);
510
511 if ((!port->tty) || (!port->tty->termios)) {
512 dbg("%s - no tty structures", __FUNCTION__);
513 return;
514 }
515
516 cflag = port->tty->termios->c_cflag;
517 /* check that they really want us to change something */
518 if (old_termios) {
519 if ((cflag == old_termios->c_cflag) &&
520 (RELEVANT_IFLAG(port->tty->termios->c_iflag) == RELEVANT_IFLAG(old_termios->c_iflag))) {
521 dbg("%s - nothing to change...", __FUNCTION__);
522 return;
523 }
524 }
525
526 /* All we can change is the baud rate */
527 if (cflag & CBAUD) {
528
529 dbg ("%s - asking for baud %d",
530 __FUNCTION__,
531 tty_get_baud_rate(port->tty));
532
533 /*
534 * FIXME, we should compare the baud request against the
535 * capability stated in the IR header that we got in the
536 * startup function.
537 */
538 switch (cflag & CBAUD) {
539 case B2400: ir_baud = SPEED_2400; break;
540 default:
541 case B9600: ir_baud = SPEED_9600; break;
542 case B19200: ir_baud = SPEED_19200; break;
543 case B38400: ir_baud = SPEED_38400; break;
544 case B57600: ir_baud = SPEED_57600; break;
545 case B115200: ir_baud = SPEED_115200; break;
546 case B576000: ir_baud = SPEED_576000; break;
547 case B1152000: ir_baud = SPEED_1152000; break;
548 #ifdef B4000000
549 case B4000000: ir_baud = SPEED_4000000; break;
550 #endif
551 }
552
553 if (xbof == -1) {
554 ir_xbof = ir_xbof_change(ir_add_bof);
555 } else {
556 ir_xbof = ir_xbof_change(xbof) ;
557 }
558
559 /* Notify the tty driver that the termios have changed. */
560 port->tty->ldisc.set_termios(port->tty, NULL);
561
562 /* FIXME need to check to see if our write urb is busy right
563 * now, or use a urb pool.
564 *
565 * send the baud change out on an "empty" data packet
566 */
567 transfer_buffer = port->write_urb->transfer_buffer;
568 *transfer_buffer = ir_xbof | ir_baud;
569
570 usb_fill_bulk_urb (
571 port->write_urb,
572 port->serial->dev,
573 usb_sndbulkpipe(port->serial->dev,
574 port->bulk_out_endpointAddress),
575 port->write_urb->transfer_buffer,
576 1,
577 ir_write_bulk_callback,
578 port);
579
580 port->write_urb->transfer_flags = URB_ZERO_PACKET;
581
582 result = usb_submit_urb (port->write_urb, GFP_KERNEL);
583 if (result)
584 dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result);
585 }
586 return;
587 }
588
589
590 static int __init ir_init (void)
591 {
592 int retval;
593 retval = usb_serial_register(&ir_device);
594 if (retval)
595 goto failed_usb_serial_register;
596 retval = usb_register(&ir_driver);
597 if (retval)
598 goto failed_usb_register;
599 info(DRIVER_DESC " " DRIVER_VERSION);
600 return 0;
601 failed_usb_register:
602 usb_serial_deregister(&ir_device);
603 failed_usb_serial_register:
604 return retval;
605 }
606
607
608 static void __exit ir_exit (void)
609 {
610 usb_deregister (&ir_driver);
611 usb_serial_deregister (&ir_device);
612 }
613
614
615 module_init(ir_init);
616 module_exit(ir_exit);
617
618 MODULE_AUTHOR(DRIVER_AUTHOR);
619 MODULE_DESCRIPTION(DRIVER_DESC);
620 MODULE_LICENSE("GPL");
621
622 module_param(debug, bool, S_IRUGO | S_IWUSR);
623 MODULE_PARM_DESC(debug, "Debug enabled or not");
624 module_param(xbof, int, 0);
625 MODULE_PARM_DESC(xbof, "Force specific number of XBOFs");
626 module_param(buffer_size, int, 0);
627 MODULE_PARM_DESC(buffer_size, "Size of the transfer buffers");
628
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