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conn rcv_lock converted to spinlock, struct cor_sock created, kernel_packet skb_clone...
[cor_2_6_31.git] / drivers / usb / serial / ir-usb.c
blob66009b6b763a29a511551a9600d50802de63d3c9
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
23 * driver
24 *
25 * 2008_Jun_02 Felipe Balbi <me@felipebalbi.com>
26 * Introduced common header to be used also in USB Gadget Framework.
27 * Still needs some other style fixes.
28 *
29 * 2007_Jun_21 Alan Cox <alan@lxorguk.ukuu.org.uk>
30 * Minimal cleanups for some of the driver problens and tty layer abuse.
31 * Still needs fixing to allow multiple dongles.
32 *
33 * 2002_Mar_07 greg kh
34 * moved some needed structures and #define values from the
35 * net/irda/irda-usb.h file into our file, as we don't want to depend on
36 * that codebase compiling correctly :)
37 *
38 * 2002_Jan_14 gb
39 * Added module parameter to force specific number of XBOFs.
40 * Added ir_xbof_change().
41 * Reorganized read_bulk_callback error handling.
42 * Switched from FILL_BULK_URB() to usb_fill_bulk_urb().
43 *
44 * 2001_Nov_08 greg kh
45 * Changed the irda_usb_find_class_desc() function based on comments and
46 * code from Martin Diehl.
47 *
48 * 2001_Nov_01 greg kh
49 * Added support for more IrDA USB devices.
50 * Added support for zero packet. Added buffer override paramater, so
51 * users can transfer larger packets at once if they wish. Both patches
52 * came from Dag Brattli <dag@obexcode.com>.
53 *
54 * 2001_Oct_07 greg kh
55 * initial version released.
56 */
57
58 #include <linux/kernel.h>
59 #include <linux/errno.h>
60 #include <linux/init.h>
61 #include <linux/slab.h>
62 #include <linux/tty.h>
63 #include <linux/tty_driver.h>
64 #include <linux/tty_flip.h>
65 #include <linux/module.h>
66 #include <linux/spinlock.h>
67 #include <linux/uaccess.h>
68 #include <linux/usb.h>
69 #include <linux/usb/serial.h>
70 #include <linux/usb/irda.h>
71
72 /*
73 * Version Information
74 */
75 #define DRIVER_VERSION "v0.4"
76 #define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>"
77 #define DRIVER_DESC "USB IR Dongle driver"
78
79 static int debug;
80
81 /* if overridden by the user, then use their value for the size of the read and
82 * write urbs */
83 static int buffer_size;
84
85 /* if overridden by the user, then use the specified number of XBOFs */
86 static int xbof = -1;
87
88 static int ir_startup (struct usb_serial *serial);
89 static int ir_open(struct tty_struct *tty, struct usb_serial_port *port,
90 struct file *filep);
91 static void ir_close(struct usb_serial_port *port);
92 static int ir_write(struct tty_struct *tty, struct usb_serial_port *port,
93 const unsigned char *buf, int count);
94 static void ir_write_bulk_callback (struct urb *urb);
95 static void ir_read_bulk_callback (struct urb *urb);
96 static void ir_set_termios(struct tty_struct *tty,
97 struct usb_serial_port *port, struct ktermios *old_termios);
98
99 /* Not that this lot means you can only have one per system */
100 static u8 ir_baud;
101 static u8 ir_xbof;
102 static u8 ir_add_bof;
103
104 static struct usb_device_id ir_id_table[] = {
105 { USB_DEVICE(0x050f, 0x0180) }, /* KC Technology, KC-180 */
106 { USB_DEVICE(0x08e9, 0x0100) }, /* XTNDAccess */
107 { USB_DEVICE(0x09c4, 0x0011) }, /* ACTiSys ACT-IR2000U */
108 { USB_INTERFACE_INFO(USB_CLASS_APP_SPEC, USB_SUBCLASS_IRDA, 0) },
109 { } /* Terminating entry */
110 };
111
112 MODULE_DEVICE_TABLE(usb, ir_id_table);
113
114 static struct usb_driver ir_driver = {
115 .name = "ir-usb",
116 .probe = usb_serial_probe,
117 .disconnect = usb_serial_disconnect,
118 .id_table = ir_id_table,
119 .no_dynamic_id = 1,
120 };
121
122 static struct usb_serial_driver ir_device = {
123 .driver = {
124 .owner = THIS_MODULE,
125 .name = "ir-usb",
126 },
127 .description = "IR Dongle",
128 .usb_driver = &ir_driver,
129 .id_table = ir_id_table,
130 .num_ports = 1,
131 .set_termios = ir_set_termios,
132 .attach = ir_startup,
133 .open = ir_open,
134 .close = ir_close,
135 .write = ir_write,
136 .write_bulk_callback = ir_write_bulk_callback,
137 .read_bulk_callback = ir_read_bulk_callback,
138 };
139
140 static inline void irda_usb_dump_class_desc(struct usb_irda_cs_descriptor *desc)
141 {
142 dbg("bLength=%x", desc->bLength);
143 dbg("bDescriptorType=%x", desc->bDescriptorType);
144 dbg("bcdSpecRevision=%x", __le16_to_cpu(desc->bcdSpecRevision));
145 dbg("bmDataSize=%x", desc->bmDataSize);
146 dbg("bmWindowSize=%x", desc->bmWindowSize);
147 dbg("bmMinTurnaroundTime=%d", desc->bmMinTurnaroundTime);
148 dbg("wBaudRate=%x", __le16_to_cpu(desc->wBaudRate));
149 dbg("bmAdditionalBOFs=%x", desc->bmAdditionalBOFs);
150 dbg("bIrdaRateSniff=%x", desc->bIrdaRateSniff);
151 dbg("bMaxUnicastList=%x", desc->bMaxUnicastList);
152 }
153
154 /*------------------------------------------------------------------*/
155 /*
156 * Function irda_usb_find_class_desc(dev, ifnum)
157 *
158 * Returns instance of IrDA class descriptor, or NULL if not found
159 *
160 * The class descriptor is some extra info that IrDA USB devices will
161 * offer to us, describing their IrDA characteristics. We will use that in
162 * irda_usb_init_qos()
163 *
164 * Based on the same function in drivers/net/irda/irda-usb.c
165 */
166 static struct usb_irda_cs_descriptor *
167 irda_usb_find_class_desc(struct usb_device *dev, unsigned int ifnum)
168 {
169 struct usb_irda_cs_descriptor *desc;
170 int ret;
171
172 desc = kzalloc(sizeof(*desc), GFP_KERNEL);
173 if (!desc)
174 return NULL;
175
176 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
177 USB_REQ_CS_IRDA_GET_CLASS_DESC,
178 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
179 0, ifnum, desc, sizeof(*desc), 1000);
180
181 dbg("%s - ret=%d", __func__, ret);
182 if (ret < sizeof(*desc)) {
183 dbg("%s - class descriptor read %s (%d)",
184 __func__,
185 (ret < 0) ? "failed" : "too short",
186 ret);
187 goto error;
188 }
189 if (desc->bDescriptorType != USB_DT_CS_IRDA) {
190 dbg("%s - bad class descriptor type", __func__);
191 goto error;
192 }
193
194 irda_usb_dump_class_desc(desc);
195 return desc;
196
197 error:
198 kfree(desc);
199 return NULL;
200 }
201
202
203 static u8 ir_xbof_change(u8 xbof)
204 {
205 u8 result;
206
207 /* reference irda-usb.c */
208 switch (xbof) {
209 case 48:
210 result = 0x10;
211 break;
212 case 28:
213 case 24:
214 result = 0x20;
215 break;
216 default:
217 case 12:
218 result = 0x30;
219 break;
220 case 5:
221 case 6:
222 result = 0x40;
223 break;
224 case 3:
225 result = 0x50;
226 break;
227 case 2:
228 result = 0x60;
229 break;
230 case 1:
231 result = 0x70;
232 break;
233 case 0:
234 result = 0x80;
235 break;
236 }
237
238 return(result);
239 }
240
241
242 static int ir_startup(struct usb_serial *serial)
243 {
244 struct usb_irda_cs_descriptor *irda_desc;
245
246 irda_desc = irda_usb_find_class_desc(serial->dev, 0);
247 if (!irda_desc) {
248 dev_err(&serial->dev->dev,
249 "IRDA class descriptor not found, device not bound\n");
250 return -ENODEV;
251 }
252
253 dbg("%s - Baud rates supported:%s%s%s%s%s%s%s%s%s",
254 __func__,
255 (irda_desc->wBaudRate & USB_IRDA_BR_2400) ? " 2400" : "",
256 (irda_desc->wBaudRate & USB_IRDA_BR_9600) ? " 9600" : "",
257 (irda_desc->wBaudRate & USB_IRDA_BR_19200) ? " 19200" : "",
258 (irda_desc->wBaudRate & USB_IRDA_BR_38400) ? " 38400" : "",
259 (irda_desc->wBaudRate & USB_IRDA_BR_57600) ? " 57600" : "",
260 (irda_desc->wBaudRate & USB_IRDA_BR_115200) ? " 115200" : "",
261 (irda_desc->wBaudRate & USB_IRDA_BR_576000) ? " 576000" : "",
262 (irda_desc->wBaudRate & USB_IRDA_BR_1152000) ? " 1152000" : "",
263 (irda_desc->wBaudRate & USB_IRDA_BR_4000000) ? " 4000000" : "");
264
265 switch (irda_desc->bmAdditionalBOFs) {
266 case USB_IRDA_AB_48:
267 ir_add_bof = 48;
268 break;
269 case USB_IRDA_AB_24:
270 ir_add_bof = 24;
271 break;
272 case USB_IRDA_AB_12:
273 ir_add_bof = 12;
274 break;
275 case USB_IRDA_AB_6:
276 ir_add_bof = 6;
277 break;
278 case USB_IRDA_AB_3:
279 ir_add_bof = 3;
280 break;
281 case USB_IRDA_AB_2:
282 ir_add_bof = 2;
283 break;
284 case USB_IRDA_AB_1:
285 ir_add_bof = 1;
286 break;
287 case USB_IRDA_AB_0:
288 ir_add_bof = 0;
289 break;
290 default:
291 break;
292 }
293
294 kfree(irda_desc);
295
296 return 0;
297 }
298
299 static int ir_open(struct tty_struct *tty,
300 struct usb_serial_port *port, struct file *filp)
301 {
302 char *buffer;
303 int result = 0;
304
305 dbg("%s - port %d", __func__, port->number);
306
307 if (buffer_size) {
308 /* override the default buffer sizes */
309 buffer = kmalloc(buffer_size, GFP_KERNEL);
310 if (!buffer) {
311 dev_err(&port->dev, "%s - out of memory.\n", __func__);
312 return -ENOMEM;
313 }
314 kfree(port->read_urb->transfer_buffer);
315 port->read_urb->transfer_buffer = buffer;
316 port->read_urb->transfer_buffer_length = buffer_size;
317
318 buffer = kmalloc(buffer_size, GFP_KERNEL);
319 if (!buffer) {
320 dev_err(&port->dev, "%s - out of memory.\n", __func__);
321 return -ENOMEM;
322 }
323 kfree(port->write_urb->transfer_buffer);
324 port->write_urb->transfer_buffer = buffer;
325 port->write_urb->transfer_buffer_length = buffer_size;
326 port->bulk_out_size = buffer_size;
327 }
328
329 /* Start reading from the device */
330 usb_fill_bulk_urb(
331 port->read_urb,
332 port->serial->dev,
333 usb_rcvbulkpipe(port->serial->dev,
334 port->bulk_in_endpointAddress),
335 port->read_urb->transfer_buffer,
336 port->read_urb->transfer_buffer_length,
337 ir_read_bulk_callback,
338 port);
339 result = usb_submit_urb(port->read_urb, GFP_KERNEL);
340 if (result)
341 dev_err(&port->dev,
342 "%s - failed submitting read urb, error %d\n",
343 __func__, result);
344
345 return result;
346 }
347
348 static void ir_close(struct usb_serial_port *port)
349 {
350 dbg("%s - port %d", __func__, port->number);
351
352 /* shutdown our bulk read */
353 usb_kill_urb(port->read_urb);
354 }
355
356 static int ir_write(struct tty_struct *tty, struct usb_serial_port *port,
357 const unsigned char *buf, int count)
358 {
359 unsigned char *transfer_buffer;
360 int result;
361 int transfer_size;
362
363 dbg("%s - port = %d, count = %d", __func__, port->number, count);
364
365 if (count == 0)
366 return 0;
367
368 spin_lock_bh(&port->lock);
369 if (port->write_urb_busy) {
370 spin_unlock_bh(&port->lock);
371 dbg("%s - already writing", __func__);
372 return 0;
373 }
374 port->write_urb_busy = 1;
375 spin_unlock_bh(&port->lock);
376
377 transfer_buffer = port->write_urb->transfer_buffer;
378 transfer_size = min(count, port->bulk_out_size - 1);
379
380 /*
381 * The first byte of the packet we send to the device contains an
382 * inbound header which indicates an additional number of BOFs and
383 * a baud rate change.
384 *
385 * See section 5.4.2.2 of the USB IrDA spec.
386 */
387 *transfer_buffer = ir_xbof | ir_baud;
388 ++transfer_buffer;
389
390 memcpy(transfer_buffer, buf, transfer_size);
391
392 usb_fill_bulk_urb(
393 port->write_urb,
394 port->serial->dev,
395 usb_sndbulkpipe(port->serial->dev,
396 port->bulk_out_endpointAddress),
397 port->write_urb->transfer_buffer,
398 transfer_size + 1,
399 ir_write_bulk_callback,
400 port);
401
402 port->write_urb->transfer_flags = URB_ZERO_PACKET;
403
404 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
405 if (result) {
406 port->write_urb_busy = 0;
407 dev_err(&port->dev,
408 "%s - failed submitting write urb, error %d\n",
409 __func__, result);
410 } else
411 result = transfer_size;
412
413 return result;
414 }
415
416 static void ir_write_bulk_callback(struct urb *urb)
417 {
418 struct usb_serial_port *port = urb->context;
419 int status = urb->status;
420
421 dbg("%s - port %d", __func__, port->number);
422
423 port->write_urb_busy = 0;
424 if (status) {
425 dbg("%s - nonzero write bulk status received: %d",
426 __func__, status);
427 return;
428 }
429
430 usb_serial_debug_data(
431 debug,
432 &port->dev,
433 __func__,
434 urb->actual_length,
435 urb->transfer_buffer);
436
437 usb_serial_port_softint(port);
438 }
439
440 static void ir_read_bulk_callback(struct urb *urb)
441 {
442 struct usb_serial_port *port = urb->context;
443 struct tty_struct *tty;
444 unsigned char *data = urb->transfer_buffer;
445 int result;
446 int status = urb->status;
447
448 dbg("%s - port %d", __func__, port->number);
449
450 if (!port->port.count) {
451 dbg("%s - port closed.", __func__);
452 return;
453 }
454
455 switch (status) {
456 case 0: /* Successful */
457 /*
458 * The first byte of the packet we get from the device
459 * contains a busy indicator and baud rate change.
460 * See section 5.4.1.2 of the USB IrDA spec.
461 */
462 if ((*data & 0x0f) > 0)
463 ir_baud = *data & 0x0f;
464 usb_serial_debug_data(debug, &port->dev, __func__,
465 urb->actual_length, data);
466 tty = tty_port_tty_get(&port->port);
467 if (tty_buffer_request_room(tty, urb->actual_length - 1)) {
468 tty_insert_flip_string(tty, data+1, urb->actual_length - 1);
469 tty_flip_buffer_push(tty);
470 }
471 tty_kref_put(tty);
472
473 /*
474 * No break here.
475 * We want to resubmit the urb so we can read
476 * again.
477 */
478
479 case -EPROTO: /* taking inspiration from pl2303.c */
480 /* Continue trying to always read */
481 usb_fill_bulk_urb(
482 port->read_urb,
483 port->serial->dev,
484 usb_rcvbulkpipe(port->serial->dev,
485 port->bulk_in_endpointAddress),
486 port->read_urb->transfer_buffer,
487 port->read_urb->transfer_buffer_length,
488 ir_read_bulk_callback,
489 port);
490
491 result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
492 if (result)
493 dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n",
494 __func__, result);
495 break ;
496 default:
497 dbg("%s - nonzero read bulk status received: %d",
498 __func__, status);
499 break ;
500 }
501 return;
502 }
503
504 static void ir_set_termios(struct tty_struct *tty,
505 struct usb_serial_port *port, struct ktermios *old_termios)
506 {
507 unsigned char *transfer_buffer;
508 int result;
509 speed_t baud;
510 int ir_baud;
511
512 dbg("%s - port %d", __func__, port->number);
513
514 baud = tty_get_baud_rate(tty);
515
516 /*
517 * FIXME, we should compare the baud request against the
518 * capability stated in the IR header that we got in the
519 * startup function.
520 */
521
522 switch (baud) {
523 case 2400:
524 ir_baud = USB_IRDA_BR_2400;
525 break;
526 case 9600:
527 ir_baud = USB_IRDA_BR_9600;
528 break;
529 case 19200:
530 ir_baud = USB_IRDA_BR_19200;
531 break;
532 case 38400:
533 ir_baud = USB_IRDA_BR_38400;
534 break;
535 case 57600:
536 ir_baud = USB_IRDA_BR_57600;
537 break;
538 case 115200:
539 ir_baud = USB_IRDA_BR_115200;
540 break;
541 case 576000:
542 ir_baud = USB_IRDA_BR_576000;
543 break;
544 case 1152000:
545 ir_baud = USB_IRDA_BR_1152000;
546 break;
547 case 4000000:
548 ir_baud = USB_IRDA_BR_4000000;
549 break;
550 default:
551 ir_baud = USB_IRDA_BR_9600;
552 baud = 9600;
553 }
554
555 if (xbof == -1)
556 ir_xbof = ir_xbof_change(ir_add_bof);
557 else
558 ir_xbof = ir_xbof_change(xbof) ;
559
560 /* FIXME need to check to see if our write urb is busy right
561 * now, or use a urb pool.
562 *
563 * send the baud change out on an "empty" data packet
564 */
565 transfer_buffer = port->write_urb->transfer_buffer;
566 *transfer_buffer = ir_xbof | ir_baud;
567
568 usb_fill_bulk_urb(
569 port->write_urb,
570 port->serial->dev,
571 usb_sndbulkpipe(port->serial->dev,
572 port->bulk_out_endpointAddress),
573 port->write_urb->transfer_buffer,
574 1,
575 ir_write_bulk_callback,
576 port);
577
578 port->write_urb->transfer_flags = URB_ZERO_PACKET;
579
580 result = usb_submit_urb(port->write_urb, GFP_KERNEL);
581 if (result)
582 dev_err(&port->dev,
583 "%s - failed submitting write urb, error %d\n",
584 __func__, result);
585
586 /* Only speed changes are supported */
587 tty_termios_copy_hw(tty->termios, old_termios);
588 tty_encode_baud_rate(tty, baud, baud);
589 }
590
591 static int __init ir_init(void)
592 {
593 int retval;
594
595 retval = usb_serial_register(&ir_device);
596 if (retval)
597 goto failed_usb_serial_register;
598
599 retval = usb_register(&ir_driver);
600 if (retval)
601 goto failed_usb_register;
602
603 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
604 DRIVER_DESC "\n");
605
606 return 0;
607
608 failed_usb_register:
609 usb_serial_deregister(&ir_device);
610
611 failed_usb_serial_register:
612 return retval;
613 }
614
615 static void __exit ir_exit(void)
616 {
617 usb_deregister(&ir_driver);
618 usb_serial_deregister(&ir_device);
619 }
620
621
622 module_init(ir_init);
623 module_exit(ir_exit);
624
625 MODULE_AUTHOR(DRIVER_AUTHOR);
626 MODULE_DESCRIPTION(DRIVER_DESC);
627 MODULE_LICENSE("GPL");
628
629 module_param(debug, bool, S_IRUGO | S_IWUSR);
630 MODULE_PARM_DESC(debug, "Debug enabled or not");
631 module_param(xbof, int, 0);
632 MODULE_PARM_DESC(xbof, "Force specific number of XBOFs");
633 module_param(buffer_size, int, 0);
634 MODULE_PARM_DESC(buffer_size, "Size of the transfer buffers");
635
connection oriented routing - ARCHIVE NO UPDATES HERE