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USB: omninet: fix write_room
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / usb / serial / ir-usb.c
blob2e0497b02260c3123ba130bd0fb37643c8b88f8d
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 static void ir_close(struct usb_serial_port *port);
91 static int ir_write(struct tty_struct *tty, struct usb_serial_port *port,
92 const unsigned char *buf, int count);
93 static void ir_write_bulk_callback (struct urb *urb);
94 static void ir_read_bulk_callback (struct urb *urb);
95 static void ir_set_termios(struct tty_struct *tty,
96 struct usb_serial_port *port, struct ktermios *old_termios);
97
98 /* Not that this lot means you can only have one per system */
99 static u8 ir_baud;
100 static u8 ir_xbof;
101 static u8 ir_add_bof;
102
103 static struct usb_device_id ir_id_table[] = {
104 { USB_DEVICE(0x050f, 0x0180) }, /* KC Technology, KC-180 */
105 { USB_DEVICE(0x08e9, 0x0100) }, /* XTNDAccess */
106 { USB_DEVICE(0x09c4, 0x0011) }, /* ACTiSys ACT-IR2000U */
107 { USB_INTERFACE_INFO(USB_CLASS_APP_SPEC, USB_SUBCLASS_IRDA, 0) },
108 { } /* Terminating entry */
109 };
110
111 MODULE_DEVICE_TABLE(usb, ir_id_table);
112
113 static struct usb_driver ir_driver = {
114 .name = "ir-usb",
115 .probe = usb_serial_probe,
116 .disconnect = usb_serial_disconnect,
117 .id_table = ir_id_table,
118 .no_dynamic_id = 1,
119 };
120
121 static struct usb_serial_driver ir_device = {
122 .driver = {
123 .owner = THIS_MODULE,
124 .name = "ir-usb",
125 },
126 .description = "IR Dongle",
127 .usb_driver = &ir_driver,
128 .id_table = ir_id_table,
129 .num_ports = 1,
130 .set_termios = ir_set_termios,
131 .attach = ir_startup,
132 .open = ir_open,
133 .close = ir_close,
134 .write = ir_write,
135 .write_bulk_callback = ir_write_bulk_callback,
136 .read_bulk_callback = ir_read_bulk_callback,
137 };
138
139 static inline void irda_usb_dump_class_desc(struct usb_irda_cs_descriptor *desc)
140 {
141 dbg("bLength=%x", desc->bLength);
142 dbg("bDescriptorType=%x", desc->bDescriptorType);
143 dbg("bcdSpecRevision=%x", __le16_to_cpu(desc->bcdSpecRevision));
144 dbg("bmDataSize=%x", desc->bmDataSize);
145 dbg("bmWindowSize=%x", desc->bmWindowSize);
146 dbg("bmMinTurnaroundTime=%d", desc->bmMinTurnaroundTime);
147 dbg("wBaudRate=%x", __le16_to_cpu(desc->wBaudRate));
148 dbg("bmAdditionalBOFs=%x", desc->bmAdditionalBOFs);
149 dbg("bIrdaRateSniff=%x", desc->bIrdaRateSniff);
150 dbg("bMaxUnicastList=%x", desc->bMaxUnicastList);
151 }
152
153 /*------------------------------------------------------------------*/
154 /*
155 * Function irda_usb_find_class_desc(dev, ifnum)
156 *
157 * Returns instance of IrDA class descriptor, or NULL if not found
158 *
159 * The class descriptor is some extra info that IrDA USB devices will
160 * offer to us, describing their IrDA characteristics. We will use that in
161 * irda_usb_init_qos()
162 *
163 * Based on the same function in drivers/net/irda/irda-usb.c
164 */
165 static struct usb_irda_cs_descriptor *
166 irda_usb_find_class_desc(struct usb_device *dev, unsigned int ifnum)
167 {
168 struct usb_irda_cs_descriptor *desc;
169 int ret;
170
171 desc = kzalloc(sizeof(*desc), GFP_KERNEL);
172 if (!desc)
173 return NULL;
174
175 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
176 USB_REQ_CS_IRDA_GET_CLASS_DESC,
177 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
178 0, ifnum, desc, sizeof(*desc), 1000);
179
180 dbg("%s - ret=%d", __func__, ret);
181 if (ret < sizeof(*desc)) {
182 dbg("%s - class descriptor read %s (%d)",
183 __func__,
184 (ret < 0) ? "failed" : "too short",
185 ret);
186 goto error;
187 }
188 if (desc->bDescriptorType != USB_DT_CS_IRDA) {
189 dbg("%s - bad class descriptor type", __func__);
190 goto error;
191 }
192
193 irda_usb_dump_class_desc(desc);
194 return desc;
195
196 error:
197 kfree(desc);
198 return NULL;
199 }
200
201
202 static u8 ir_xbof_change(u8 xbof)
203 {
204 u8 result;
205
206 /* reference irda-usb.c */
207 switch (xbof) {
208 case 48:
209 result = 0x10;
210 break;
211 case 28:
212 case 24:
213 result = 0x20;
214 break;
215 default:
216 case 12:
217 result = 0x30;
218 break;
219 case 5:
220 case 6:
221 result = 0x40;
222 break;
223 case 3:
224 result = 0x50;
225 break;
226 case 2:
227 result = 0x60;
228 break;
229 case 1:
230 result = 0x70;
231 break;
232 case 0:
233 result = 0x80;
234 break;
235 }
236
237 return(result);
238 }
239
240
241 static int ir_startup(struct usb_serial *serial)
242 {
243 struct usb_irda_cs_descriptor *irda_desc;
244
245 irda_desc = irda_usb_find_class_desc(serial->dev, 0);
246 if (!irda_desc) {
247 dev_err(&serial->dev->dev,
248 "IRDA class descriptor not found, device not bound\n");
249 return -ENODEV;
250 }
251
252 dbg("%s - Baud rates supported:%s%s%s%s%s%s%s%s%s",
253 __func__,
254 (irda_desc->wBaudRate & USB_IRDA_BR_2400) ? " 2400" : "",
255 (irda_desc->wBaudRate & USB_IRDA_BR_9600) ? " 9600" : "",
256 (irda_desc->wBaudRate & USB_IRDA_BR_19200) ? " 19200" : "",
257 (irda_desc->wBaudRate & USB_IRDA_BR_38400) ? " 38400" : "",
258 (irda_desc->wBaudRate & USB_IRDA_BR_57600) ? " 57600" : "",
259 (irda_desc->wBaudRate & USB_IRDA_BR_115200) ? " 115200" : "",
260 (irda_desc->wBaudRate & USB_IRDA_BR_576000) ? " 576000" : "",
261 (irda_desc->wBaudRate & USB_IRDA_BR_1152000) ? " 1152000" : "",
262 (irda_desc->wBaudRate & USB_IRDA_BR_4000000) ? " 4000000" : "");
263
264 switch (irda_desc->bmAdditionalBOFs) {
265 case USB_IRDA_AB_48:
266 ir_add_bof = 48;
267 break;
268 case USB_IRDA_AB_24:
269 ir_add_bof = 24;
270 break;
271 case USB_IRDA_AB_12:
272 ir_add_bof = 12;
273 break;
274 case USB_IRDA_AB_6:
275 ir_add_bof = 6;
276 break;
277 case USB_IRDA_AB_3:
278 ir_add_bof = 3;
279 break;
280 case USB_IRDA_AB_2:
281 ir_add_bof = 2;
282 break;
283 case USB_IRDA_AB_1:
284 ir_add_bof = 1;
285 break;
286 case USB_IRDA_AB_0:
287 ir_add_bof = 0;
288 break;
289 default:
290 break;
291 }
292
293 kfree(irda_desc);
294
295 return 0;
296 }
297
298 static int ir_open(struct tty_struct *tty, struct usb_serial_port *port)
299 {
300 char *buffer;
301 int result = 0;
302
303 dbg("%s - port %d", __func__, port->number);
304
305 if (buffer_size) {
306 /* override the default buffer sizes */
307 buffer = kmalloc(buffer_size, GFP_KERNEL);
308 if (!buffer) {
309 dev_err(&port->dev, "%s - out of memory.\n", __func__);
310 return -ENOMEM;
311 }
312 kfree(port->read_urb->transfer_buffer);
313 port->read_urb->transfer_buffer = buffer;
314 port->read_urb->transfer_buffer_length = buffer_size;
315 port->bulk_in_buffer = buffer;
316
317 buffer = kmalloc(buffer_size, GFP_KERNEL);
318 if (!buffer) {
319 dev_err(&port->dev, "%s - out of memory.\n", __func__);
320 return -ENOMEM;
321 }
322 kfree(port->write_urb->transfer_buffer);
323 port->write_urb->transfer_buffer = buffer;
324 port->write_urb->transfer_buffer_length = buffer_size;
325 port->bulk_out_buffer = buffer;
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
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