summaryrefslogtreecommitdiffstats
path: root/sound/usb/line6/driver.c
blob: e2fbff05c1b1392f9d3bfcfe8caade6525eceb3b (plain)
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
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
/*
 * Line 6 Linux USB driver
 *
 * Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
 *
 *	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, version 2.
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/export.h>
#include <linux/slab.h>
#include <linux/usb.h>

#include <sound/core.h>
#include <sound/initval.h>

#include "capture.h"
#include "driver.h"
#include "midi.h"
#include "playback.h"
#include "revision.h"
#include "usbdefs.h"

#define DRIVER_AUTHOR  "Markus Grabner <grabner@icg.tugraz.at>"
#define DRIVER_DESC    "Line 6 USB Driver"

/*
	This is Line 6's MIDI manufacturer ID.
*/
const unsigned char line6_midi_id[] = {
	0x00, 0x01, 0x0c
};
EXPORT_SYMBOL_GPL(line6_midi_id);

/*
	Code to request version of POD, Variax interface
	(and maybe other devices).
*/
static const char line6_request_version[] = {
	0xf0, 0x7e, 0x7f, 0x06, 0x01, 0xf7
};

/**
	 Class for asynchronous messages.
*/
struct message {
	struct usb_line6 *line6;
	const char *buffer;
	int size;
	int done;
};

/*
	Forward declarations.
*/
static void line6_data_received(struct urb *urb);
static int line6_send_raw_message_async_part(struct message *msg,
					     struct urb *urb);

/*
	Start to listen on endpoint.
*/
static int line6_start_listen(struct usb_line6 *line6)
{
	int err;

	usb_fill_int_urb(line6->urb_listen, line6->usbdev,
		usb_rcvintpipe(line6->usbdev, line6->properties->ep_ctrl_r),
		line6->buffer_listen, LINE6_BUFSIZE_LISTEN,
		line6_data_received, line6, line6->interval);
	line6->urb_listen->actual_length = 0;
	err = usb_submit_urb(line6->urb_listen, GFP_ATOMIC);
	return err;
}

/*
	Stop listening on endpoint.
*/
static void line6_stop_listen(struct usb_line6 *line6)
{
	usb_kill_urb(line6->urb_listen);
}

/*
	Send raw message in pieces of wMaxPacketSize bytes.
*/
static int line6_send_raw_message(struct usb_line6 *line6, const char *buffer,
				  int size)
{
	int i, done = 0;

	for (i = 0; i < size; i += line6->max_packet_size) {
		int partial;
		const char *frag_buf = buffer + i;
		int frag_size = min(line6->max_packet_size, size - i);
		int retval;

		retval = usb_interrupt_msg(line6->usbdev,
					usb_sndintpipe(line6->usbdev,
						line6->properties->ep_ctrl_w),
					(char *)frag_buf, frag_size,
					&partial, LINE6_TIMEOUT * HZ);

		if (retval) {
			dev_err(line6->ifcdev,
				"usb_interrupt_msg failed (%d)\n", retval);
			break;
		}

		done += frag_size;
	}

	return done;
}

/*
	Notification of completion of asynchronous request transmission.
*/
static void line6_async_request_sent(struct urb *urb)
{
	struct message *msg = (struct message *)urb->context;

	if (msg->done >= msg->size) {
		usb_free_urb(urb);
		kfree(msg);
	} else
		line6_send_raw_message_async_part(msg, urb);
}

/*
	Asynchronously send part of a raw message.
*/
static int line6_send_raw_message_async_part(struct message *msg,
					     struct urb *urb)
{
	int retval;
	struct usb_line6 *line6 = msg->line6;
	int done = msg->done;
	int bytes = min(msg->size - done, line6->max_packet_size);

	usb_fill_int_urb(urb, line6->usbdev,
		usb_sndintpipe(line6->usbdev, line6->properties->ep_ctrl_w),
		(char *)msg->buffer + done, bytes,
		line6_async_request_sent, msg, line6->interval);

	msg->done += bytes;
	retval = usb_submit_urb(urb, GFP_ATOMIC);

	if (retval < 0) {
		dev_err(line6->ifcdev, "%s: usb_submit_urb failed (%d)\n",
			__func__, retval);
		usb_free_urb(urb);
		kfree(msg);
		return retval;
	}

	return 0;
}

/*
	Setup and start timer.
*/
void line6_start_timer(struct timer_list *timer, unsigned int msecs,
		       void (*function)(unsigned long), unsigned long data)
{
	setup_timer(timer, function, data);
	mod_timer(timer, jiffies + msecs * HZ / 1000);
}
EXPORT_SYMBOL_GPL(line6_start_timer);

/*
	Asynchronously send raw message.
*/
int line6_send_raw_message_async(struct usb_line6 *line6, const char *buffer,
				 int size)
{
	struct message *msg;
	struct urb *urb;

	/* create message: */
	msg = kmalloc(sizeof(struct message), GFP_ATOMIC);
	if (msg == NULL)
		return -ENOMEM;

	/* create URB: */
	urb = usb_alloc_urb(0, GFP_ATOMIC);

	if (urb == NULL) {
		kfree(msg);
		return -ENOMEM;
	}

	/* set message data: */
	msg->line6 = line6;
	msg->buffer = buffer;
	msg->size = size;
	msg->done = 0;

	/* start sending: */
	return line6_send_raw_message_async_part(msg, urb);
}
EXPORT_SYMBOL_GPL(line6_send_raw_message_async);

/*
	Send asynchronous device version request.
*/
int line6_version_request_async(struct usb_line6 *line6)
{
	char *buffer;
	int retval;

	buffer = kmemdup(line6_request_version,
			sizeof(line6_request_version), GFP_ATOMIC);
	if (buffer == NULL)
		return -ENOMEM;

	retval = line6_send_raw_message_async(line6, buffer,
					      sizeof(line6_request_version));
	kfree(buffer);
	return retval;
}
EXPORT_SYMBOL_GPL(line6_version_request_async);

/*
	Send sysex message in pieces of wMaxPacketSize bytes.
*/
int line6_send_sysex_message(struct usb_line6 *line6, const char *buffer,
			     int size)
{
	return line6_send_raw_message(line6, buffer,
				      size + SYSEX_EXTRA_SIZE) -
	    SYSEX_EXTRA_SIZE;
}
EXPORT_SYMBOL_GPL(line6_send_sysex_message);

/*
	Allocate buffer for sysex message and prepare header.
	@param code sysex message code
	@param size number of bytes between code and sysex end
*/
char *line6_alloc_sysex_buffer(struct usb_line6 *line6, int code1, int code2,
			       int size)
{
	char *buffer = kmalloc(size + SYSEX_EXTRA_SIZE, GFP_ATOMIC);

	if (!buffer)
		return NULL;

	buffer[0] = LINE6_SYSEX_BEGIN;
	memcpy(buffer + 1, line6_midi_id, sizeof(line6_midi_id));
	buffer[sizeof(line6_midi_id) + 1] = code1;
	buffer[sizeof(line6_midi_id) + 2] = code2;
	buffer[sizeof(line6_midi_id) + 3 + size] = LINE6_SYSEX_END;
	return buffer;
}
EXPORT_SYMBOL_GPL(line6_alloc_sysex_buffer);

/*
	Notification of data received from the Line 6 device.
*/
static void line6_data_received(struct urb *urb)
{
	struct usb_line6 *line6 = (struct usb_line6 *)urb->context;
	struct midi_buffer *mb = &line6->line6midi->midibuf_in;
	int done;

	if (urb->status == -ESHUTDOWN)
		return;

	done =
	    line6_midibuf_write(mb, urb->transfer_buffer, urb->actual_length);

	if (done < urb->actual_length) {
		line6_midibuf_ignore(mb, done);
		dev_dbg(line6->ifcdev, "%d %d buffer overflow - message skipped\n",
			done, urb->actual_length);
	}

	for (;;) {
		done =
		    line6_midibuf_read(mb, line6->buffer_message,
				       LINE6_MESSAGE_MAXLEN);

		if (done == 0)
			break;

		line6->message_length = done;
		line6_midi_receive(line6, line6->buffer_message, done);

		if (line6->process_message)
			line6->process_message(line6);
	}

	line6_start_listen(line6);
}

/*
	Read data from device.
*/
int line6_read_data(struct usb_line6 *line6, int address, void *data,
		    size_t datalen)
{
	struct usb_device *usbdev = line6->usbdev;
	int ret;
	unsigned char len;

	/* query the serial number: */
	ret = usb_control_msg(usbdev, usb_sndctrlpipe(usbdev, 0), 0x67,
			      USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
			      (datalen << 8) | 0x21, address,
			      NULL, 0, LINE6_TIMEOUT * HZ);

	if (ret < 0) {
		dev_err(line6->ifcdev, "read request failed (error %d)\n", ret);
		return ret;
	}

	/* Wait for data length. We'll get 0xff until length arrives. */
	do {
		ret = usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0), 0x67,
				      USB_TYPE_VENDOR | USB_RECIP_DEVICE |
				      USB_DIR_IN,
				      0x0012, 0x0000, &len, 1,
				      LINE6_TIMEOUT * HZ);
		if (ret < 0) {
			dev_err(line6->ifcdev,
				"receive length failed (error %d)\n", ret);
			return ret;
		}
	} while (len == 0xff);

	if (len != datalen) {
		/* should be equal or something went wrong */
		dev_err(line6->ifcdev,
			"length mismatch (expected %d, got %d)\n",
			(int)datalen, (int)len);
		return -EINVAL;
	}

	/* receive the result: */
	ret = usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0), 0x67,
			      USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
			      0x0013, 0x0000, data, datalen,
			      LINE6_TIMEOUT * HZ);

	if (ret < 0) {
		dev_err(line6->ifcdev, "read failed (error %d)\n", ret);
		return ret;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(line6_read_data);

/*
	Write data to device.
*/
int line6_write_data(struct usb_line6 *line6, int address, void *data,
		     size_t datalen)
{
	struct usb_device *usbdev = line6->usbdev;
	int ret;
	unsigned char status;

	ret = usb_control_msg(usbdev, usb_sndctrlpipe(usbdev, 0), 0x67,
			      USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
			      0x0022, address, data, datalen,
			      LINE6_TIMEOUT * HZ);

	if (ret < 0) {
		dev_err(line6->ifcdev,
			"write request failed (error %d)\n", ret);
		return ret;
	}

	do {
		ret = usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0),
				      0x67,
				      USB_TYPE_VENDOR | USB_RECIP_DEVICE |
				      USB_DIR_IN,
				      0x0012, 0x0000,
				      &status, 1, LINE6_TIMEOUT * HZ);

		if (ret < 0) {
			dev_err(line6->ifcdev,
				"receiving status failed (error %d)\n", ret);
			return ret;
		}
	} while (status == 0xff);

	if (status != 0) {
		dev_err(line6->ifcdev, "write failed (error %d)\n", ret);
		return -EINVAL;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(line6_write_data);

/*
	Read Line 6 device serial number.
	(POD, TonePort, GuitarPort)
*/
int line6_read_serial_number(struct usb_line6 *line6, int *serial_number)
{
	return line6_read_data(line6, 0x80d0, serial_number,
			       sizeof(*serial_number));
}
EXPORT_SYMBOL_GPL(line6_read_serial_number);

/*
	Card destructor.
*/
static void line6_destruct(struct snd_card *card)
{
	struct usb_line6 *line6 = card->private_data;
	struct usb_device *usbdev;

	if (!line6)
		return;
	usbdev = line6->usbdev;

	/* free buffer memory first: */
	kfree(line6->buffer_message);
	kfree(line6->buffer_listen);

	/* then free URBs: */
	usb_free_urb(line6->urb_listen);

	/* free interface data: */
	kfree(line6);

	/* decrement reference counters: */
	usb_put_dev(usbdev);
}

/* get data from endpoint descriptor (see usb_maxpacket): */
static void line6_get_interval(struct usb_line6 *line6)
{
	struct usb_device *usbdev = line6->usbdev;
	struct usb_host_endpoint *ep;
	unsigned pipe = usb_rcvintpipe(usbdev, line6->properties->ep_ctrl_r);
	unsigned epnum = usb_pipeendpoint(pipe);

	ep = usbdev->ep_in[epnum];
	if (ep) {
		line6->interval = ep->desc.bInterval;
		line6->max_packet_size = le16_to_cpu(ep->desc.wMaxPacketSize);
	} else {
		dev_err(line6->ifcdev,
			"endpoint not available, using fallback values");
		line6->interval = LINE6_FALLBACK_INTERVAL;
		line6->max_packet_size = LINE6_FALLBACK_MAXPACKETSIZE;
	}
}

static int line6_init_cap_control(struct usb_line6 *line6)
{
	int ret;

	/* initialize USB buffers: */
	line6->buffer_listen = kmalloc(LINE6_BUFSIZE_LISTEN, GFP_KERNEL);
	if (!line6->buffer_listen)
		return -ENOMEM;

	line6->buffer_message = kmalloc(LINE6_MESSAGE_MAXLEN, GFP_KERNEL);
	if (!line6->buffer_message)
		return -ENOMEM;

	line6->urb_listen = usb_alloc_urb(0, GFP_KERNEL);
	if (!line6->urb_listen)
		return -ENOMEM;

	ret = line6_start_listen(line6);
	if (ret < 0) {
		dev_err(line6->ifcdev, "cannot start listening: %d\n", ret);
		return ret;
	}

	return 0;
}

/*
	Probe USB device.
*/
int line6_probe(struct usb_interface *interface,
		const struct usb_device_id *id,
		struct usb_line6 *line6,
		const struct line6_properties *properties,
		int (*private_init)(struct usb_line6 *, const struct usb_device_id *id))
{
	struct usb_device *usbdev = interface_to_usbdev(interface);
	struct snd_card *card;
	int interface_number;
	int ret;

	ret = snd_card_new(&interface->dev,
			   SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
			   THIS_MODULE, 0, &card);
	if (ret < 0) {
		kfree(line6);
		return ret;
	}

	/* store basic data: */
	line6->card = card;
	line6->properties = properties;
	line6->usbdev = usbdev;
	line6->ifcdev = &interface->dev;

	strcpy(card->id, line6->properties->id);
	strcpy(card->driver, DRIVER_NAME);
	strcpy(card->shortname, line6->properties->name);
	sprintf(card->longname, "Line 6 %s at USB %s", line6->properties->name,
		dev_name(line6->ifcdev));
	card->private_data = line6;
	card->private_free = line6_destruct;

	usb_set_intfdata(interface, line6);

	/* increment reference counters: */
	usb_get_dev(usbdev);

	/* we don't handle multiple configurations */
	if (usbdev->descriptor.bNumConfigurations != 1) {
		ret = -ENODEV;
		goto error;
	}

	/* initialize device info: */
	dev_info(&interface->dev, "Line 6 %s found\n", properties->name);

	/* query interface number */
	interface_number = interface->cur_altsetting->desc.bInterfaceNumber;

	ret = usb_set_interface(usbdev, interface_number,
			properties->altsetting);
	if (ret < 0) {
		dev_err(&interface->dev, "set_interface failed\n");
		goto error;
	}

	line6_get_interval(line6);

	if (properties->capabilities & LINE6_CAP_CONTROL) {
		ret = line6_init_cap_control(line6);
		if (ret < 0)
			goto error;
	}

	/* initialize device data based on device: */
	ret = private_init(line6, id);
	if (ret < 0)
		goto error;

	/* creation of additional special files should go here */

	dev_info(&interface->dev, "Line 6 %s now attached\n",
		 line6->properties->name);

	return 0;

 error:
	if (line6->disconnect)
		line6->disconnect(line6);
	snd_card_free(card);
	return ret;
}
EXPORT_SYMBOL_GPL(line6_probe);

/*
	Line 6 device disconnected.
*/
void line6_disconnect(struct usb_interface *interface)
{
	struct usb_line6 *line6 = usb_get_intfdata(interface);
	struct usb_device *usbdev = interface_to_usbdev(interface);

	if (!line6)
		return;

	if (WARN_ON(usbdev != line6->usbdev))
		return;

	if (line6->urb_listen != NULL)
		line6_stop_listen(line6);

	snd_card_disconnect(line6->card);
	if (line6->line6pcm)
		line6_pcm_disconnect(line6->line6pcm);
	if (line6->disconnect)
		line6->disconnect(line6);

	dev_info(&interface->dev, "Line 6 %s now disconnected\n",
		 line6->properties->name);

	/* make sure the device isn't destructed twice: */
	usb_set_intfdata(interface, NULL);

	snd_card_free_when_closed(line6->card);
}
EXPORT_SYMBOL_GPL(line6_disconnect);

#ifdef CONFIG_PM

/*
	Suspend Line 6 device.
*/
int line6_suspend(struct usb_interface *interface, pm_message_t message)
{
	struct usb_line6 *line6 = usb_get_intfdata(interface);
	struct snd_line6_pcm *line6pcm = line6->line6pcm;

	snd_power_change_state(line6->card, SNDRV_CTL_POWER_D3hot);

	if (line6->properties->capabilities & LINE6_CAP_CONTROL)
		line6_stop_listen(line6);

	if (line6pcm != NULL) {
		snd_pcm_suspend_all(line6pcm->pcm);
		line6pcm->flags = 0;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(line6_suspend);

/*
	Resume Line 6 device.
*/
int line6_resume(struct usb_interface *interface)
{
	struct usb_line6 *line6 = usb_get_intfdata(interface);

	if (line6->properties->capabilities & LINE6_CAP_CONTROL)
		line6_start_listen(line6);

	snd_power_change_state(line6->card, SNDRV_CTL_POWER_D0);
	return 0;
}
EXPORT_SYMBOL_GPL(line6_resume);

#endif /* CONFIG_PM */

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