aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/usb/serial/ir-usb.c
blob: 937b2fdd7171ab04a045caac5edffb2775f8e210 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
/*
 * USB IR Dongle driver
 *
 *	Copyright (C) 2001-2002	Greg Kroah-Hartman (greg@kroah.com)
 *	Copyright (C) 2002	Gary Brubaker (xavyer@ix.netcom.com)
 *
 *	This program is free software; you can redistribute it and/or modify
 *	it under the terms of the GNU General Public License as published by
 *	the Free Software Foundation; either version 2 of the License, or
 *	(at your option) any later version.
 *
 * This driver allows a USB IrDA device to be used as a "dumb" serial device.
 * This can be useful if you do not have access to a full IrDA stack on the
 * other side of the connection.  If you do have an IrDA stack on both devices,
 * please use the usb-irda driver, as it contains the proper error checking and
 * other goodness of a full IrDA stack.
 *
 * Portions of this driver were taken from drivers/net/irda/irda-usb.c, which
 * was written by Roman Weissgaerber <weissg@vienna.at>, Dag Brattli
 * <dag@brattli.net>, and Jean Tourrilhes <jt@hpl.hp.com>
 *
 * See Documentation/usb/usb-serial.txt for more information on using this driver
 *
 * 2002_Mar_07	greg kh
 *	moved some needed structures and #define values from the
 *	net/irda/irda-usb.h file into our file, as we don't want to depend on
 *	that codebase compiling correctly :)
 *
 * 2002_Jan_14  gb
 *	Added module parameter to force specific number of XBOFs.
 *	Added ir_xbof_change().
 *	Reorganized read_bulk_callback error handling.
 *	Switched from FILL_BULK_URB() to usb_fill_bulk_urb().
 *
 * 2001_Nov_08  greg kh
 *	Changed the irda_usb_find_class_desc() function based on comments and
 *	code from Martin Diehl.
 *
 * 2001_Nov_01	greg kh
 *	Added support for more IrDA USB devices.
 *	Added support for zero packet.  Added buffer override paramater, so
 *	users can transfer larger packets at once if they wish.  Both patches
 *	came from Dag Brattli <dag@obexcode.com>.
 *
 * 2001_Oct_07	greg kh
 *	initial version released.
 */

#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <asm/uaccess.h>
#include <linux/usb.h>
#include "usb-serial.h"

/*
 * Version Information
 */
#define DRIVER_VERSION "v0.4"
#define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>"
#define DRIVER_DESC "USB IR Dongle driver"

/* USB IrDA class spec information */
#define USB_CLASS_IRDA		0x02
#define USB_DT_IRDA		0x21
#define IU_REQ_GET_CLASS_DESC	0x06
#define SPEED_2400		0x01
#define SPEED_9600		0x02
#define SPEED_19200		0x03
#define SPEED_38400		0x04
#define SPEED_57600		0x05
#define SPEED_115200		0x06
#define SPEED_576000		0x07
#define SPEED_1152000		0x08
#define SPEED_4000000		0x09

struct irda_class_desc {
	u8	bLength;
	u8	bDescriptorType;
	u16	bcdSpecRevision;
	u8	bmDataSize;
	u8	bmWindowSize;
	u8	bmMinTurnaroundTime;
	u16	wBaudRate;
	u8	bmAdditionalBOFs;
	u8	bIrdaRateSniff;
	u8	bMaxUnicastList;
} __attribute__ ((packed));

static int debug;

/* if overridden by the user, then use their value for the size of the read and
 * write urbs */
static int buffer_size;
/* if overridden by the user, then use the specified number of XBOFs */
static int xbof = -1;

static int  ir_startup (struct usb_serial *serial);
static int  ir_open (struct usb_serial_port *port, struct file *filep);
static void ir_close (struct usb_serial_port *port, struct file *filep);
static int  ir_write (struct usb_serial_port *port, const unsigned char *buf, int count);
static void ir_write_bulk_callback (struct urb *urb, struct pt_regs *regs);
static void ir_read_bulk_callback (struct urb *urb, struct pt_regs *regs);
static void ir_set_termios (struct usb_serial_port *port, struct termios *old_termios);

static u8 ir_baud = 0;
static u8 ir_xbof = 0;
static u8 ir_add_bof = 0;

static struct usb_device_id id_table [] = {
	{ USB_DEVICE(0x050f, 0x0180) },		/* KC Technology, KC-180 */
	{ USB_DEVICE(0x08e9, 0x0100) },		/* XTNDAccess */
	{ USB_DEVICE(0x09c4, 0x0011) },		/* ACTiSys ACT-IR2000U */
	{ USB_INTERFACE_INFO (USB_CLASS_APP_SPEC, USB_CLASS_IRDA, 0) },
	{ }					/* Terminating entry */
};

MODULE_DEVICE_TABLE (usb, id_table);

static struct usb_driver ir_driver = {
	.owner =	THIS_MODULE,
	.name =		"ir-usb",
	.probe =	usb_serial_probe,
	.disconnect =	usb_serial_disconnect,
	.id_table =	id_table,
};


static struct usb_serial_device_type ir_device = {
	.owner =		THIS_MODULE,
	.name =			"IR Dongle",
	.id_table =		id_table,
	.num_interrupt_in =	1,
	.num_bulk_in =		1,
	.num_bulk_out =		1,
	.num_ports =		1,
	.set_termios =		ir_set_termios,
	.attach =		ir_startup,
	.open =			ir_open,
	.close =		ir_close,
	.write =		ir_write,
	.write_bulk_callback =	ir_write_bulk_callback,
	.read_bulk_callback =	ir_read_bulk_callback,
};

static inline void irda_usb_dump_class_desc(struct irda_class_desc *desc)
{
	dbg("bLength=%x", desc->bLength);
	dbg("bDescriptorType=%x", desc->bDescriptorType);
	dbg("bcdSpecRevision=%x", desc->bcdSpecRevision); 
	dbg("bmDataSize=%x", desc->bmDataSize);
	dbg("bmWindowSize=%x", desc->bmWindowSize);
	dbg("bmMinTurnaroundTime=%d", desc->bmMinTurnaroundTime);
	dbg("wBaudRate=%x", desc->wBaudRate);
	dbg("bmAdditionalBOFs=%x", desc->bmAdditionalBOFs);
	dbg("bIrdaRateSniff=%x", desc->bIrdaRateSniff);
	dbg("bMaxUnicastList=%x", desc->bMaxUnicastList);
}

/*------------------------------------------------------------------*/
/*
 * Function irda_usb_find_class_desc(dev, ifnum)
 *
 *    Returns instance of IrDA class descriptor, or NULL if not found
 *
 * The class descriptor is some extra info that IrDA USB devices will
 * offer to us, describing their IrDA characteristics. We will use that in
 * irda_usb_init_qos()
 *
 * Based on the same function in drivers/net/irda/irda-usb.c
 */
static struct irda_class_desc *irda_usb_find_class_desc(struct usb_device *dev, unsigned int ifnum)
{
	struct irda_class_desc *desc;
	int ret;
		
	desc = kmalloc(sizeof (struct irda_class_desc), GFP_KERNEL);
	if (desc == NULL) 
		return NULL;
	memset(desc, 0, sizeof(struct irda_class_desc));
	
	ret = usb_control_msg(dev, usb_rcvctrlpipe(dev,0),
			IU_REQ_GET_CLASS_DESC,
			USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
			0, ifnum, desc, sizeof(*desc), 1000);
	
	dbg("%s -  ret=%d", __FUNCTION__, ret);
	if (ret < sizeof(*desc)) {
		dbg("%s - class descriptor read %s (%d)",
				__FUNCTION__, 
				(ret<0) ? "failed" : "too short",
				ret);
		goto error;
	}
	if (desc->bDescriptorType != USB_DT_IRDA) {
		dbg("%s - bad class descriptor type", __FUNCTION__);
		goto error;
	}
	
	irda_usb_dump_class_desc(desc);
	return desc;
error:
	kfree(desc);
	return NULL;
}


static u8 ir_xbof_change(u8 xbof)
{
	u8 result;
	/* reference irda-usb.c */
	switch(xbof) {
		case 48: result = 0x10; break;
		case 28:
		case 24: result = 0x20; break;
		default:
		case 12: result = 0x30; break;
		case  5:
		case  6: result = 0x40; break;
		case  3: result = 0x50; break;
		case  2: result = 0x60; break;
		case  1: result = 0x70; break;
		case  0: result = 0x80; break;
	}
	return(result);
}


static int ir_startup (struct usb_serial *serial)
{
	struct irda_class_desc *irda_desc;

	irda_desc = irda_usb_find_class_desc (serial->dev, 0);
	if (irda_desc == NULL) {
		dev_err (&serial->dev->dev, "IRDA class descriptor not found, device not bound\n");
		return -ENODEV;
	}

	dbg ("%s - Baud rates supported:%s%s%s%s%s%s%s%s%s",
		__FUNCTION__,
		(irda_desc->wBaudRate & 0x0001) ? " 2400"    : "",
		(irda_desc->wBaudRate & 0x0002) ? " 9600"    : "",
		(irda_desc->wBaudRate & 0x0004) ? " 19200"   : "",
		(irda_desc->wBaudRate & 0x0008) ? " 38400"   : "",
		(irda_desc->wBaudRate & 0x0010) ? " 57600"   : "",
		(irda_desc->wBaudRate & 0x0020) ? " 115200"  : "",
		(irda_desc->wBaudRate & 0x0040) ? " 576000"  : "",
		(irda_desc->wBaudRate & 0x0080) ? " 1152000" : "",
		(irda_desc->wBaudRate & 0x0100) ? " 4000000" : "");

	switch( irda_desc->bmAdditionalBOFs ) {
		case 0x01: ir_add_bof = 48; break;
		case 0x02: ir_add_bof = 24; break;
		case 0x04: ir_add_bof = 12; break;
		case 0x08: ir_add_bof =  6; break;
		case 0x10: ir_add_bof =  3; break;
		case 0x20: ir_add_bof =  2; break;
		case 0x40: ir_add_bof =  1; break;
		case 0x80: ir_add_bof =  0; break;
		default:;
	}

	kfree (irda_desc);

	return 0;		
}

static int ir_open (struct usb_serial_port *port, struct file *filp)
{
	char *buffer;
	int result = 0;

	dbg("%s - port %d", __FUNCTION__, port->number);

	if (buffer_size) {
		/* override the default buffer sizes */
		buffer = kmalloc (buffer_size, GFP_KERNEL);
		if (!buffer) {
			dev_err (&port->dev, "%s - out of memory.\n", __FUNCTION__);
			return -ENOMEM;
		}
		kfree (port->read_urb->transfer_buffer);
		port->read_urb->transfer_buffer = buffer;
		port->read_urb->transfer_buffer_length = buffer_size;

		buffer = kmalloc (buffer_size, GFP_KERNEL);
		if (!buffer) {
			dev_err (&port->dev, "%s - out of memory.\n", __FUNCTION__);
			return -ENOMEM;
		}
		kfree (port->write_urb->transfer_buffer);
		port->write_urb->transfer_buffer = buffer;
		port->write_urb->transfer_buffer_length = buffer_size;
		port->bulk_out_size = buffer_size;
	}

	/* Start reading from the device */
	usb_fill_bulk_urb (
		port->read_urb,
		port->serial->dev, 
		usb_rcvbulkpipe(port->serial->dev, port->bulk_in_endpointAddress),
		port->read_urb->transfer_buffer,
		port->read_urb->transfer_buffer_length,
		ir_read_bulk_callback,
		port);
	result = usb_submit_urb(port->read_urb, GFP_KERNEL);
	if (result)
		dev_err(&port->dev, "%s - failed submitting read urb, error %d\n", __FUNCTION__, result);

	return result;
}

static void ir_close (struct usb_serial_port *port, struct file * filp)
{
	dbg("%s - port %d", __FUNCTION__, port->number);
			 
	/* shutdown our bulk read */
	usb_kill_urb(port->read_urb);
}

static int ir_write (struct usb_serial_port *port, const unsigned char *buf, int count)
{
	unsigned char *transfer_buffer;
	int result;
	int transfer_size;

	dbg("%s - port = %d, count = %d", __FUNCTION__, port->number, count);

	if (!port->tty) {
		dev_err (&port->dev, "%s - no tty???\n", __FUNCTION__);
		return 0;
	}

	if (count == 0)
		return 0;

	spin_lock(&port->lock);
	if (port->write_urb_busy) {
		spin_unlock(&port->lock);
		dbg("%s - already writing", __FUNCTION__);
		return 0;
	}
	port->write_urb_busy = 1;
	spin_unlock(&port->lock);

	transfer_buffer = port->write_urb->transfer_buffer;
	transfer_size = min(count, port->bulk_out_size - 1);

	/*
	 * The first byte of the packet we send to the device contains an
	 * inband header which indicates an additional number of BOFs and
	 * a baud rate change.
	 *
	 * See section 5.4.2.2 of the USB IrDA spec.
	 */
	*transfer_buffer = ir_xbof | ir_baud;
	++transfer_buffer;

	memcpy (transfer_buffer, buf, transfer_size);

	usb_fill_bulk_urb (
		port->write_urb,
		port->serial->dev,
		usb_sndbulkpipe(port->serial->dev,
			port->bulk_out_endpointAddress),
		port->write_urb->transfer_buffer,
		transfer_size + 1,
		ir_write_bulk_callback,
		port);

	port->write_urb->transfer_flags = URB_ZERO_PACKET;

	result = usb_submit_urb (port->write_urb, GFP_ATOMIC);
	if (result) {
		port->write_urb_busy = 0;
		dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result);
	} else
		result = transfer_size;

	return result;
}

static void ir_write_bulk_callback (struct urb *urb, struct pt_regs *regs)
{
	struct usb_serial_port *port = (struct usb_serial_port *)urb->context;

	dbg("%s - port %d", __FUNCTION__, port->number);

	port->write_urb_busy = 0;
	if (urb->status) {
		dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
		return;
	}

	usb_serial_debug_data (
		debug,
		&port->dev,
		__FUNCTION__,
		urb->actual_length,
		urb->transfer_buffer);

	schedule_work(&port->work);
}

static void ir_read_bulk_callback (struct urb *urb, struct pt_regs *regs)
{
	struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
	struct tty_struct *tty;
	unsigned char *data = urb->transfer_buffer;
	int result;

	dbg("%s - port %d", __FUNCTION__, port->number);

	if (!port->open_count) {
		dbg("%s - port closed.", __FUNCTION__);
		return;
	}

	switch (urb->status) {

		case 0: /* Successful */

			/*
			 * The first byte of the packet we get from the device
			 * contains a busy indicator and baud rate change.
			 * See section 5.4.1.2 of the USB IrDA spec.
			 */
			if ((*data & 0x0f) > 0)
				ir_baud = *data & 0x0f;

			usb_serial_debug_data (
				debug,
				&port->dev,
				__FUNCTION__,
				urb->actual_length,
				data);

			/*
			 * Bypass flip-buffers, and feed the ldisc directly
			 * due to our potentially large buffer size.  Since we
			 * used to set low_latency, this is exactly what the
			 * tty layer did anyway :)
			 */
			tty = port->tty;

			/*
			 *	FIXME: must not do this in IRQ context,
			 *	must honour TTY_DONT_FLIP
			 */
			tty->ldisc.receive_buf(
				tty,
				data+1,
				NULL,
				urb->actual_length-1);

			/*
			 * No break here.
			 * We want to resubmit the urb so we can read
			 * again.
			 */

		case -EPROTO: /* taking inspiration from pl2303.c */

			/* Continue trying to always read */
			usb_fill_bulk_urb (
				port->read_urb,
				port->serial->dev, 
				usb_rcvbulkpipe(port->serial->dev,
					port->bulk_in_endpointAddress),
				port->read_urb->transfer_buffer,
				port->read_urb->transfer_buffer_length,
				ir_read_bulk_callback,
				port);

			result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
			if (result)
				dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n",
					__FUNCTION__, result);

			break ;

		default:
			dbg("%s - nonzero read bulk status received: %d",
				__FUNCTION__, 
				urb->status);
			break ;

	}

	return;
}

static void ir_set_termios (struct usb_serial_port *port, struct termios *old_termios)
{
	unsigned char *transfer_buffer;
	unsigned int cflag;
	int result;

	dbg("%s - port %d", __FUNCTION__, port->number);

	if ((!port->tty) || (!port->tty->termios)) {
		dbg("%s - no tty structures", __FUNCTION__);
		return;
	}

	cflag = port->tty->termios->c_cflag;
	/* check that they really want us to change something */
	if (old_termios) {
		if ((cflag == old_termios->c_cflag) &&
		    (RELEVANT_IFLAG(port->tty->termios->c_iflag) == RELEVANT_IFLAG(old_termios->c_iflag))) {
			dbg("%s - nothing to change...", __FUNCTION__);
			return;
		}
	}

	/* All we can change is the baud rate */
	if (cflag & CBAUD) {

		dbg ("%s - asking for baud %d",
			__FUNCTION__,
			tty_get_baud_rate(port->tty));

		/* 
		 * FIXME, we should compare the baud request against the
		 * capability stated in the IR header that we got in the
		 * startup function.
		 */
		switch (cflag & CBAUD) {
			case B2400:    ir_baud = SPEED_2400;    break;
			default:
			case B9600:    ir_baud = SPEED_9600;    break;
			case B19200:   ir_baud = SPEED_19200;   break;
			case B38400:   ir_baud = SPEED_38400;   break;
			case B57600:   ir_baud = SPEED_57600;   break;
			case B115200:  ir_baud = SPEED_115200;  break;
			case B576000:  ir_baud = SPEED_576000;  break;
			case B1152000: ir_baud = SPEED_1152000; break;
#ifdef B4000000
			case B4000000: ir_baud = SPEED_4000000; break;
#endif
		}

		if (xbof == -1) {
			ir_xbof = ir_xbof_change(ir_add_bof);
		} else {
			ir_xbof = ir_xbof_change(xbof) ;
		}

		/* Notify the tty driver that the termios have changed. */
		port->tty->ldisc.set_termios(port->tty, NULL);

		/* FIXME need to check to see if our write urb is busy right
		 * now, or use a urb pool.
		 *
		 * send the baud change out on an "empty" data packet
		 */
		transfer_buffer = port->write_urb->transfer_buffer;
		*transfer_buffer = ir_xbof | ir_baud;

		usb_fill_bulk_urb (
			port->write_urb,
			port->serial->dev,
			usb_sndbulkpipe(port->serial->dev,
				port->bulk_out_endpointAddress),
			port->write_urb->transfer_buffer,
			1,
			ir_write_bulk_callback,
			port);

		port->write_urb->transfer_flags = URB_ZERO_PACKET;

		result = usb_submit_urb (port->write_urb, GFP_KERNEL);
		if (result)
			dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result);
	}
	return;
}


static int __init ir_init (void)
{
	int retval;
	retval = usb_serial_register(&ir_device);
	if (retval)
		goto failed_usb_serial_register;
	retval = usb_register(&ir_driver);
	if (retval) 
		goto failed_usb_register;
	info(DRIVER_DESC " " DRIVER_VERSION);
	return 0;
failed_usb_register:
	usb_serial_deregister(&ir_device);
failed_usb_serial_register:
	return retval;
}


static void __exit ir_exit (void)
{
	usb_deregister (&ir_driver);
	usb_serial_deregister (&ir_device);
}


module_init(ir_init);
module_exit(ir_exit);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debug enabled or not");
module_param(xbof, int, 0);
MODULE_PARM_DESC(xbof, "Force specific number of XBOFs");
module_param(buffer_size, int, 0);
MODULE_PARM_DESC(buffer_size, "Size of the transfer buffers");