ir-usb.c revision 6f6ed696945c9c98fb6e0def32d29411d958a6fa 
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
79static int debug;
80
81/* if overridden by the user, then use their value for the size of the read and
82 * write urbs */
83static int buffer_size;
84
85/* if overridden by the user, then use the specified number of XBOFs */
86static int xbof = -1;
87
88static int  ir_startup (struct usb_serial *serial);
89static int  ir_open(struct tty_struct *tty, struct usb_serial_port *port);
90static void ir_close(struct usb_serial_port *port);
91static int  ir_write(struct tty_struct *tty, struct usb_serial_port *port,
92					const unsigned char *buf, int count);
93static void ir_write_bulk_callback (struct urb *urb);
94static void ir_read_bulk_callback (struct urb *urb);
95static 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 */
99static u8 ir_baud;
100static u8 ir_xbof;
101static u8 ir_add_bof;
102
103static const 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
111MODULE_DEVICE_TABLE(usb, ir_id_table);
112
113static 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
121static 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
139static 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 */
165static struct usb_irda_cs_descriptor *
166irda_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
196error:
197	kfree(desc);
198	return NULL;
199}
200
201
202static 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
241static 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
298static int ir_open(struct tty_struct *tty, struct usb_serial_port *port)
299{
300	int result = 0;
301
302	dbg("%s - port %d", __func__, port->number);
303
304	/* Start reading from the device */
305	usb_fill_bulk_urb(
306		port->read_urb,
307		port->serial->dev,
308		usb_rcvbulkpipe(port->serial->dev,
309			port->bulk_in_endpointAddress),
310		port->read_urb->transfer_buffer,
311		port->read_urb->transfer_buffer_length,
312		ir_read_bulk_callback,
313		port);
314	result = usb_submit_urb(port->read_urb, GFP_KERNEL);
315	if (result)
316		dev_err(&port->dev,
317			"%s - failed submitting read urb, error %d\n",
318			__func__, result);
319
320	return result;
321}
322
323static void ir_close(struct usb_serial_port *port)
324{
325	dbg("%s - port %d", __func__, port->number);
326
327	/* shutdown our bulk read */
328	usb_kill_urb(port->read_urb);
329}
330
331static int ir_write(struct tty_struct *tty, struct usb_serial_port *port,
332					const unsigned char *buf, int count)
333{
334	unsigned char *transfer_buffer;
335	int result;
336	int transfer_size;
337
338	dbg("%s - port = %d, count = %d", __func__, port->number, count);
339
340	if (count == 0)
341		return 0;
342
343	spin_lock_bh(&port->lock);
344	if (port->write_urb_busy) {
345		spin_unlock_bh(&port->lock);
346		dbg("%s - already writing", __func__);
347		return 0;
348	}
349	port->write_urb_busy = 1;
350	spin_unlock_bh(&port->lock);
351
352	transfer_buffer = port->write_urb->transfer_buffer;
353	transfer_size = min(count, port->bulk_out_size - 1);
354
355	/*
356	 * The first byte of the packet we send to the device contains an
357	 * inbound header which indicates an additional number of BOFs and
358	 * a baud rate change.
359	 *
360	 * See section 5.4.2.2 of the USB IrDA spec.
361	 */
362	*transfer_buffer = ir_xbof | ir_baud;
363	++transfer_buffer;
364
365	memcpy(transfer_buffer, buf, transfer_size);
366
367	usb_fill_bulk_urb(
368		port->write_urb,
369		port->serial->dev,
370		usb_sndbulkpipe(port->serial->dev,
371			port->bulk_out_endpointAddress),
372		port->write_urb->transfer_buffer,
373		transfer_size + 1,
374		ir_write_bulk_callback,
375		port);
376
377	port->write_urb->transfer_flags = URB_ZERO_PACKET;
378
379	result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
380	if (result) {
381		port->write_urb_busy = 0;
382		dev_err(&port->dev,
383			"%s - failed submitting write urb, error %d\n",
384			__func__, result);
385	} else
386		result = transfer_size;
387
388	return result;
389}
390
391static void ir_write_bulk_callback(struct urb *urb)
392{
393	struct usb_serial_port *port = urb->context;
394	int status = urb->status;
395
396	dbg("%s - port %d", __func__, port->number);
397
398	port->write_urb_busy = 0;
399	if (status) {
400		dbg("%s - nonzero write bulk status received: %d",
401		    __func__, status);
402		return;
403	}
404
405	usb_serial_debug_data(
406		debug,
407		&port->dev,
408		__func__,
409		urb->actual_length,
410		urb->transfer_buffer);
411
412	usb_serial_port_softint(port);
413}
414
415static void ir_read_bulk_callback(struct urb *urb)
416{
417	struct usb_serial_port *port = urb->context;
418	struct tty_struct *tty;
419	unsigned char *data = urb->transfer_buffer;
420	int result;
421	int status = urb->status;
422
423	dbg("%s - port %d", __func__, port->number);
424
425	switch (status) {
426	case 0: /* Successful */
427		/*
428		 * The first byte of the packet we get from the device
429		 * contains a busy indicator and baud rate change.
430		 * See section 5.4.1.2 of the USB IrDA spec.
431		 */
432		if ((*data & 0x0f) > 0)
433			ir_baud = *data & 0x0f;
434		usb_serial_debug_data(debug, &port->dev, __func__,
435						urb->actual_length, data);
436		tty = tty_port_tty_get(&port->port);
437		tty_insert_flip_string(tty, data+1, urb->actual_length - 1);
438		tty_flip_buffer_push(tty);
439		tty_kref_put(tty);
440
441		/*
442		 * No break here.
443		 * We want to resubmit the urb so we can read
444		 * again.
445		 */
446
447	case -EPROTO: /* taking inspiration from pl2303.c */
448			/* Continue trying to always read */
449		usb_fill_bulk_urb(
450			port->read_urb,
451			port->serial->dev,
452			usb_rcvbulkpipe(port->serial->dev,
453				port->bulk_in_endpointAddress),
454			port->read_urb->transfer_buffer,
455			port->read_urb->transfer_buffer_length,
456			ir_read_bulk_callback,
457			port);
458
459		result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
460		if (result)
461			dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n",
462				__func__, result);
463			break ;
464	default:
465		dbg("%s - nonzero read bulk status received: %d",
466			__func__, status);
467		break ;
468	}
469	return;
470}
471
472static void ir_set_termios(struct tty_struct *tty,
473		struct usb_serial_port *port, struct ktermios *old_termios)
474{
475	unsigned char *transfer_buffer;
476	int result;
477	speed_t baud;
478	int ir_baud;
479
480	dbg("%s - port %d", __func__, port->number);
481
482	baud = tty_get_baud_rate(tty);
483
484	/*
485	 * FIXME, we should compare the baud request against the
486	 * capability stated in the IR header that we got in the
487	 * startup function.
488	 */
489
490	switch (baud) {
491	case 2400:
492		ir_baud = USB_IRDA_BR_2400;
493		break;
494	case 9600:
495		ir_baud = USB_IRDA_BR_9600;
496		break;
497	case 19200:
498		ir_baud = USB_IRDA_BR_19200;
499		break;
500	case 38400:
501		ir_baud = USB_IRDA_BR_38400;
502		break;
503	case 57600:
504		ir_baud = USB_IRDA_BR_57600;
505		break;
506	case 115200:
507		ir_baud = USB_IRDA_BR_115200;
508		break;
509	case 576000:
510		ir_baud = USB_IRDA_BR_576000;
511		break;
512	case 1152000:
513		ir_baud = USB_IRDA_BR_1152000;
514		break;
515	case 4000000:
516		ir_baud = USB_IRDA_BR_4000000;
517		break;
518	default:
519		ir_baud = USB_IRDA_BR_9600;
520		baud = 9600;
521	}
522
523	if (xbof == -1)
524		ir_xbof = ir_xbof_change(ir_add_bof);
525	else
526		ir_xbof = ir_xbof_change(xbof) ;
527
528	/* FIXME need to check to see if our write urb is busy right
529	 * now, or use a urb pool.
530	 *
531	 * send the baud change out on an "empty" data packet
532	 */
533	transfer_buffer = port->write_urb->transfer_buffer;
534	*transfer_buffer = ir_xbof | ir_baud;
535
536	usb_fill_bulk_urb(
537		port->write_urb,
538		port->serial->dev,
539		usb_sndbulkpipe(port->serial->dev,
540			port->bulk_out_endpointAddress),
541		port->write_urb->transfer_buffer,
542		1,
543		ir_write_bulk_callback,
544		port);
545
546	port->write_urb->transfer_flags = URB_ZERO_PACKET;
547
548	result = usb_submit_urb(port->write_urb, GFP_KERNEL);
549	if (result)
550		dev_err(&port->dev,
551				"%s - failed submitting write urb, error %d\n",
552				__func__, result);
553
554	/* Only speed changes are supported */
555	tty_termios_copy_hw(tty->termios, old_termios);
556	tty_encode_baud_rate(tty, baud, baud);
557}
558
559static int __init ir_init(void)
560{
561	int retval;
562
563	if (buffer_size) {
564		ir_device.bulk_in_size = buffer_size;
565		ir_device.bulk_out_size = buffer_size;
566	}
567
568	retval = usb_serial_register(&ir_device);
569	if (retval)
570		goto failed_usb_serial_register;
571
572	retval = usb_register(&ir_driver);
573	if (retval)
574		goto failed_usb_register;
575
576	printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
577	       DRIVER_DESC "\n");
578
579	return 0;
580
581failed_usb_register:
582	usb_serial_deregister(&ir_device);
583
584failed_usb_serial_register:
585	return retval;
586}
587
588static void __exit ir_exit(void)
589{
590	usb_deregister(&ir_driver);
591	usb_serial_deregister(&ir_device);
592}
593
594
595module_init(ir_init);
596module_exit(ir_exit);
597
598MODULE_AUTHOR(DRIVER_AUTHOR);
599MODULE_DESCRIPTION(DRIVER_DESC);
600MODULE_LICENSE("GPL");
601
602module_param(debug, bool, S_IRUGO | S_IWUSR);
603MODULE_PARM_DESC(debug, "Debug enabled or not");
604module_param(xbof, int, 0);
605MODULE_PARM_DESC(xbof, "Force specific number of XBOFs");
606module_param(buffer_size, int, 0);
607MODULE_PARM_DESC(buffer_size, "Size of the transfer buffers");
608
609