summaryrefslogtreecommitdiffstats
path: root/kernel/sound/firewire/scs1x.c
blob: 2dba848a781fd19f1fb2ca8c25bf2ff56fb0eabd (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
/*
 * Stanton Control System 1 MIDI driver
 *
 * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
 * Licensed under the terms of the GNU General Public License, version 2.
 */

#include <linux/device.h>
#include <linux/firewire.h>
#include <linux/firewire-constants.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/wait.h>
#include <sound/core.h>
#include <sound/initval.h>
#include <sound/rawmidi.h>
#include "lib.h"

#define OUI_STANTON	0x001260
#define MODEL_SCS_1M	0x001000
#define MODEL_SCS_1D	0x002000

#define HSS1394_ADDRESS			0xc007dedadadaULL
#define HSS1394_MAX_PACKET_SIZE		64

#define HSS1394_TAG_USER_DATA		0x00
#define HSS1394_TAG_CHANGE_ADDRESS	0xf1

struct scs {
	struct snd_card *card;
	struct fw_unit *unit;
	struct fw_address_handler hss_handler;
	struct fw_transaction transaction;
	bool transaction_running;
	bool output_idle;
	u8 output_status;
	u8 output_bytes;
	bool output_escaped;
	bool output_escape_high_nibble;
	u8 input_escape_count;
	struct snd_rawmidi_substream *output;
	struct snd_rawmidi_substream *input;
	struct tasklet_struct tasklet;
	wait_queue_head_t idle_wait;
	u8 *buffer;
};

static const u8 sysex_escape_prefix[] = {
	0xf0,			/* SysEx begin */
	0x00, 0x01, 0x60,	/* Stanton DJ */
	0x48, 0x53, 0x53,	/* "HSS" */
};

static int scs_output_open(struct snd_rawmidi_substream *stream)
{
	struct scs *scs = stream->rmidi->private_data;

	scs->output_status = 0;
	scs->output_bytes = 1;
	scs->output_escaped = false;

	return 0;
}

static int scs_output_close(struct snd_rawmidi_substream *stream)
{
	return 0;
}

static void scs_output_trigger(struct snd_rawmidi_substream *stream, int up)
{
	struct scs *scs = stream->rmidi->private_data;

	ACCESS_ONCE(scs->output) = up ? stream : NULL;
	if (up) {
		scs->output_idle = false;
		tasklet_schedule(&scs->tasklet);
	}
}

static void scs_write_callback(struct fw_card *card, int rcode,
			       void *data, size_t length, void *callback_data)
{
	struct scs *scs = callback_data;

	if (rcode == RCODE_GENERATION) {
		/* TODO: retry this packet */
	}

	scs->transaction_running = false;
	tasklet_schedule(&scs->tasklet);
}

static bool is_valid_running_status(u8 status)
{
	return status >= 0x80 && status <= 0xef;
}

static bool is_one_byte_cmd(u8 status)
{
	return status == 0xf6 ||
	       status >= 0xf8;
}

static bool is_two_bytes_cmd(u8 status)
{
	return (status >= 0xc0 && status <= 0xdf) ||
	       status == 0xf1 ||
	       status == 0xf3;
}

static bool is_three_bytes_cmd(u8 status)
{
	return (status >= 0x80 && status <= 0xbf) ||
	       (status >= 0xe0 && status <= 0xef) ||
	       status == 0xf2;
}

static bool is_invalid_cmd(u8 status)
{
	return status == 0xf4 ||
	       status == 0xf5 ||
	       status == 0xf9 ||
	       status == 0xfd;
}

static void scs_output_tasklet(unsigned long data)
{
	struct scs *scs = (void *)data;
	struct snd_rawmidi_substream *stream;
	unsigned int i;
	u8 byte;
	struct fw_device *dev;
	int generation;

	if (scs->transaction_running)
		return;

	stream = ACCESS_ONCE(scs->output);
	if (!stream) {
		scs->output_idle = true;
		wake_up(&scs->idle_wait);
		return;
	}

	i = scs->output_bytes;
	for (;;) {
		if (snd_rawmidi_transmit(stream, &byte, 1) != 1) {
			scs->output_bytes = i;
			scs->output_idle = true;
			wake_up(&scs->idle_wait);
			return;
		}
		/*
		 * Convert from real MIDI to what I think the device expects (no
		 * running status, one command per packet, unescaped SysExs).
		 */
		if (scs->output_escaped && byte < 0x80) {
			if (scs->output_escape_high_nibble) {
				if (i < HSS1394_MAX_PACKET_SIZE) {
					scs->buffer[i] = byte << 4;
					scs->output_escape_high_nibble = false;
				}
			} else {
				scs->buffer[i++] |= byte & 0x0f;
				scs->output_escape_high_nibble = true;
			}
		} else if (byte < 0x80) {
			if (i == 1) {
				if (!is_valid_running_status(scs->output_status))
					continue;
				scs->buffer[0] = HSS1394_TAG_USER_DATA;
				scs->buffer[i++] = scs->output_status;
			}
			scs->buffer[i++] = byte;
			if ((i == 3 && is_two_bytes_cmd(scs->output_status)) ||
			    (i == 4 && is_three_bytes_cmd(scs->output_status)))
				break;
			if (i == 1 + ARRAY_SIZE(sysex_escape_prefix) &&
			    !memcmp(scs->buffer + 1, sysex_escape_prefix,
				    ARRAY_SIZE(sysex_escape_prefix))) {
				scs->output_escaped = true;
				scs->output_escape_high_nibble = true;
				i = 0;
			}
			if (i >= HSS1394_MAX_PACKET_SIZE)
				i = 1;
		} else if (byte == 0xf7) {
			if (scs->output_escaped) {
				if (i >= 1 && scs->output_escape_high_nibble &&
				    scs->buffer[0] != HSS1394_TAG_CHANGE_ADDRESS)
					break;
			} else {
				if (i > 1 && scs->output_status == 0xf0) {
					scs->buffer[i++] = 0xf7;
					break;
				}
			}
			i = 1;
			scs->output_escaped = false;
		} else if (!is_invalid_cmd(byte) &&
			   byte < 0xf8) {
			i = 1;
			scs->buffer[0] = HSS1394_TAG_USER_DATA;
			scs->buffer[i++] = byte;
			scs->output_status = byte;
			scs->output_escaped = false;
			if (is_one_byte_cmd(byte))
				break;
		}
	}
	scs->output_bytes = 1;
	scs->output_escaped = false;

	scs->transaction_running = true;
	dev = fw_parent_device(scs->unit);
	generation = dev->generation;
	smp_rmb(); /* node_id vs. generation */
	fw_send_request(dev->card, &scs->transaction, TCODE_WRITE_BLOCK_REQUEST,
			dev->node_id, generation, dev->max_speed,
			HSS1394_ADDRESS, scs->buffer, i,
			scs_write_callback, scs);
}

static void scs_output_drain(struct snd_rawmidi_substream *stream)
{
	struct scs *scs = stream->rmidi->private_data;

	wait_event(scs->idle_wait, scs->output_idle);
}

static struct snd_rawmidi_ops output_ops = {
	.open    = scs_output_open,
	.close   = scs_output_close,
	.trigger = scs_output_trigger,
	.drain   = scs_output_drain,
};

static int scs_input_open(struct snd_rawmidi_substream *stream)
{
	struct scs *scs = stream->rmidi->private_data;

	scs->input_escape_count = 0;

	return 0;
}

static int scs_input_close(struct snd_rawmidi_substream *stream)
{
	return 0;
}

static void scs_input_trigger(struct snd_rawmidi_substream *stream, int up)
{
	struct scs *scs = stream->rmidi->private_data;

	ACCESS_ONCE(scs->input) = up ? stream : NULL;
}

static void scs_input_escaped_byte(struct snd_rawmidi_substream *stream,
				   u8 byte)
{
	u8 nibbles[2];

	nibbles[0] = byte >> 4;
	nibbles[1] = byte & 0x0f;
	snd_rawmidi_receive(stream, nibbles, 2);
}

static void scs_input_midi_byte(struct scs *scs,
				struct snd_rawmidi_substream *stream,
				u8 byte)
{
	if (scs->input_escape_count > 0) {
		scs_input_escaped_byte(stream, byte);
		scs->input_escape_count--;
		if (scs->input_escape_count == 0)
			snd_rawmidi_receive(stream, (const u8[]) { 0xf7 }, 1);
	} else if (byte == 0xf9) {
		snd_rawmidi_receive(stream, sysex_escape_prefix,
				    ARRAY_SIZE(sysex_escape_prefix));
		scs_input_escaped_byte(stream, 0x00);
		scs_input_escaped_byte(stream, 0xf9);
		scs->input_escape_count = 3;
	} else {
		snd_rawmidi_receive(stream, &byte, 1);
	}
}

static void scs_input_packet(struct scs *scs,
			     struct snd_rawmidi_substream *stream,
			     const u8 *data, unsigned int bytes)
{
	unsigned int i;

	if (data[0] == HSS1394_TAG_USER_DATA) {
		for (i = 1; i < bytes; ++i)
			scs_input_midi_byte(scs, stream, data[i]);
	} else {
		snd_rawmidi_receive(stream, sysex_escape_prefix,
				    ARRAY_SIZE(sysex_escape_prefix));
		for (i = 0; i < bytes; ++i)
			scs_input_escaped_byte(stream, data[i]);
		snd_rawmidi_receive(stream, (const u8[]) { 0xf7 }, 1);
	}
}

static struct snd_rawmidi_ops input_ops = {
	.open    = scs_input_open,
	.close   = scs_input_close,
	.trigger = scs_input_trigger,
};

static int scs_create_midi(struct scs *scs)
{
	struct snd_rawmidi *rmidi;
	int err;

	err = snd_rawmidi_new(scs->card, "SCS.1x", 0, 1, 1, &rmidi);
	if (err < 0)
		return err;
	snprintf(rmidi->name, sizeof(rmidi->name),
		 "%s MIDI", scs->card->shortname);
	rmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT |
	                    SNDRV_RAWMIDI_INFO_INPUT |
	                    SNDRV_RAWMIDI_INFO_DUPLEX;
	rmidi->private_data = scs;
	snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &output_ops);
	snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &input_ops);

	return 0;
}

static void handle_hss(struct fw_card *card, struct fw_request *request,
		       int tcode, int destination, int source, int generation,
		       unsigned long long offset, void *data, size_t length,
		       void *callback_data)
{
	struct scs *scs = callback_data;
	struct snd_rawmidi_substream *stream;

	if (offset != scs->hss_handler.offset) {
		fw_send_response(card, request, RCODE_ADDRESS_ERROR);
		return;
	}
	if (tcode != TCODE_WRITE_QUADLET_REQUEST &&
	    tcode != TCODE_WRITE_BLOCK_REQUEST) {
		fw_send_response(card, request, RCODE_TYPE_ERROR);
		return;
	}

	if (length >= 1) {
		stream = ACCESS_ONCE(scs->input);
		if (stream)
			scs_input_packet(scs, stream, data, length);
	}

	fw_send_response(card, request, RCODE_COMPLETE);
}

static int scs_init_hss_address(struct scs *scs)
{
	__be64 data;
	int err;

	data = cpu_to_be64(((u64)HSS1394_TAG_CHANGE_ADDRESS << 56) |
			   scs->hss_handler.offset);
	err = snd_fw_transaction(scs->unit, TCODE_WRITE_BLOCK_REQUEST,
				 HSS1394_ADDRESS, &data, 8, 0);
	if (err < 0)
		dev_err(&scs->unit->device, "HSS1394 communication failed\n");

	return err;
}

static void scs_card_free(struct snd_card *card)
{
	struct scs *scs = card->private_data;

	fw_core_remove_address_handler(&scs->hss_handler);
	kfree(scs->buffer);
}

static int scs_probe(struct fw_unit *unit, const struct ieee1394_device_id *id)
{
	struct fw_device *fw_dev = fw_parent_device(unit);
	struct snd_card *card;
	struct scs *scs;
	int err;

	err = snd_card_new(&unit->device, -16, NULL, THIS_MODULE,
			   sizeof(*scs), &card);
	if (err < 0)
		return err;

	scs = card->private_data;
	scs->card = card;
	scs->unit = unit;
	tasklet_init(&scs->tasklet, scs_output_tasklet, (unsigned long)scs);
	init_waitqueue_head(&scs->idle_wait);
	scs->output_idle = true;

	scs->buffer = kmalloc(HSS1394_MAX_PACKET_SIZE, GFP_KERNEL);
	if (!scs->buffer) {
		err = -ENOMEM;
		goto err_card;
	}

	scs->hss_handler.length = HSS1394_MAX_PACKET_SIZE;
	scs->hss_handler.address_callback = handle_hss;
	scs->hss_handler.callback_data = scs;
	err = fw_core_add_address_handler(&scs->hss_handler,
					  &fw_high_memory_region);
	if (err < 0)
		goto err_buffer;

	card->private_free = scs_card_free;

	strcpy(card->driver, "SCS.1x");
	strcpy(card->shortname, "SCS.1x");
	fw_csr_string(unit->directory, CSR_MODEL,
		      card->shortname, sizeof(card->shortname));
	snprintf(card->longname, sizeof(card->longname),
		 "Stanton DJ %s (GUID %08x%08x) at %s, S%d",
		 card->shortname, fw_dev->config_rom[3], fw_dev->config_rom[4],
		 dev_name(&unit->device), 100 << fw_dev->max_speed);
	strcpy(card->mixername, card->shortname);

	err = scs_init_hss_address(scs);
	if (err < 0)
		goto err_card;

	err = scs_create_midi(scs);
	if (err < 0)
		goto err_card;

	err = snd_card_register(card);
	if (err < 0)
		goto err_card;

	dev_set_drvdata(&unit->device, scs);

	return 0;

err_buffer:
	kfree(scs->buffer);
err_card:
	snd_card_free(card);
	return err;
}

static void scs_update(struct fw_unit *unit)
{
	struct scs *scs = dev_get_drvdata(&unit->device);
	int generation;
	__be64 data;

	data = cpu_to_be64(((u64)HSS1394_TAG_CHANGE_ADDRESS << 56) |
			   scs->hss_handler.offset);
	generation = fw_parent_device(unit)->generation;
	smp_rmb(); /* node_id vs. generation */
	snd_fw_transaction(scs->unit, TCODE_WRITE_BLOCK_REQUEST,
			   HSS1394_ADDRESS, &data, 8,
			   FW_FIXED_GENERATION | generation);
}

static void scs_remove(struct fw_unit *unit)
{
	struct scs *scs = dev_get_drvdata(&unit->device);

	snd_card_disconnect(scs->card);

	ACCESS_ONCE(scs->output) = NULL;
	ACCESS_ONCE(scs->input) = NULL;

	wait_event(scs->idle_wait, scs->output_idle);

	tasklet_kill(&scs->tasklet);

	snd_card_free_when_closed(scs->card);
}

static const struct ieee1394_device_id scs_id_table[] = {
	{
		.match_flags = IEEE1394_MATCH_VENDOR_ID |
		               IEEE1394_MATCH_MODEL_ID,
		.vendor_id   = OUI_STANTON,
		.model_id    = MODEL_SCS_1M,
	},
	{
		.match_flags = IEEE1394_MATCH_VENDOR_ID |
		               IEEE1394_MATCH_MODEL_ID,
		.vendor_id   = OUI_STANTON,
		.model_id    = MODEL_SCS_1D,
	},
	{}
};
MODULE_DEVICE_TABLE(ieee1394, scs_id_table);

MODULE_DESCRIPTION("SCS.1x MIDI driver");
MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
MODULE_LICENSE("GPL v2");

static struct fw_driver scs_driver = {
	.driver = {
		.owner  = THIS_MODULE,
		.name   = KBUILD_MODNAME,
		.bus    = &fw_bus_type,
	},
	.probe    = scs_probe,
	.update   = scs_update,
	.remove   = scs_remove,
	.id_table = scs_id_table,
};

static int __init alsa_scs1x_init(void)
{
	return driver_register(&scs_driver.driver);
}

static void __exit alsa_scs1x_exit(void)
{
	driver_unregister(&scs_driver.driver);
}

module_init(alsa_scs1x_init);
module_exit(alsa_scs1x_exit);