summaryrefslogtreecommitdiffstats
path: root/sound/firewire/dice/dice.c
blob: 8b64aef31a864523d428e6fa26b8c6a5f45db154 (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
/*
 * TC Applied Technologies Digital Interface Communications Engine driver
 *
 * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
 * Licensed under the terms of the GNU General Public License, version 2.
 */

#include "dice.h"

MODULE_DESCRIPTION("DICE driver");
MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
MODULE_LICENSE("GPL v2");

#define OUI_WEISS		0x001c6a
#define OUI_LOUD		0x000ff2
#define OUI_FOCUSRITE		0x00130e
#define OUI_TCELECTRONIC	0x001486

#define DICE_CATEGORY_ID	0x04
#define WEISS_CATEGORY_ID	0x00
#define LOUD_CATEGORY_ID	0x10

#define PROBE_DELAY_MS		(2 * MSEC_PER_SEC)

/*
 * Some models support several isochronous channels, while these streams are not
 * always available. In this case, add the model name to this list.
 */
static bool force_two_pcm_support(struct fw_unit *unit)
{
	const char *const models[] = {
		/* TC Electronic models. */
		"StudioKonnekt48",
		/* Focusrite models. */
		"SAFFIRE_PRO_40",
		"LIQUID_SAFFIRE_56",
		"SAFFIRE_PRO_40_1",
	};
	char model[32];
	unsigned int i;
	int err;

	err = fw_csr_string(unit->directory, CSR_MODEL, model, sizeof(model));
	if (err < 0)
		return false;

	for (i = 0; i < ARRAY_SIZE(models); i++) {
		if (strcmp(models[i], model) == 0)
			break;
	}

	return i < ARRAY_SIZE(models);
}

static int check_dice_category(struct fw_unit *unit)
{
	struct fw_device *device = fw_parent_device(unit);
	struct fw_csr_iterator it;
	int key, val, vendor = -1, model = -1;
	unsigned int category;

	/*
	 * Check that GUID and unit directory are constructed according to DICE
	 * rules, i.e., that the specifier ID is the GUID's OUI, and that the
	 * GUID chip ID consists of the 8-bit category ID, the 10-bit product
	 * ID, and a 22-bit serial number.
	 */
	fw_csr_iterator_init(&it, unit->directory);
	while (fw_csr_iterator_next(&it, &key, &val)) {
		switch (key) {
		case CSR_SPECIFIER_ID:
			vendor = val;
			break;
		case CSR_MODEL:
			model = val;
			break;
		}
	}

	if (vendor == OUI_FOCUSRITE || vendor == OUI_TCELECTRONIC) {
		if (force_two_pcm_support(unit))
			return 0;
	}

	if (vendor == OUI_WEISS)
		category = WEISS_CATEGORY_ID;
	else if (vendor == OUI_LOUD)
		category = LOUD_CATEGORY_ID;
	else
		category = DICE_CATEGORY_ID;
	if (device->config_rom[3] != ((vendor << 8) | category) ||
	    device->config_rom[4] >> 22 != model)
		return -ENODEV;

	return 0;
}

static int check_clock_caps(struct snd_dice *dice)
{
	__be32 value;
	int err;

	/* some very old firmwares don't tell about their clock support */
	if (dice->clock_caps > 0) {
		err = snd_dice_transaction_read_global(dice,
						GLOBAL_CLOCK_CAPABILITIES,
						&value, 4);
		if (err < 0)
			return err;
		dice->clock_caps = be32_to_cpu(value);
	} else {
		/* this should be supported by any device */
		dice->clock_caps = CLOCK_CAP_RATE_44100 |
				   CLOCK_CAP_RATE_48000 |
				   CLOCK_CAP_SOURCE_ARX1 |
				   CLOCK_CAP_SOURCE_INTERNAL;
	}

	return 0;
}

static void dice_card_strings(struct snd_dice *dice)
{
	struct snd_card *card = dice->card;
	struct fw_device *dev = fw_parent_device(dice->unit);
	char vendor[32], model[32];
	unsigned int i;
	int err;

	strcpy(card->driver, "DICE");

	strcpy(card->shortname, "DICE");
	BUILD_BUG_ON(NICK_NAME_SIZE < sizeof(card->shortname));
	err = snd_dice_transaction_read_global(dice, GLOBAL_NICK_NAME,
					       card->shortname,
					       sizeof(card->shortname));
	if (err >= 0) {
		/* DICE strings are returned in "always-wrong" endianness */
		BUILD_BUG_ON(sizeof(card->shortname) % 4 != 0);
		for (i = 0; i < sizeof(card->shortname); i += 4)
			swab32s((u32 *)&card->shortname[i]);
		card->shortname[sizeof(card->shortname) - 1] = '\0';
	}

	strcpy(vendor, "?");
	fw_csr_string(dev->config_rom + 5, CSR_VENDOR, vendor, sizeof(vendor));
	strcpy(model, "?");
	fw_csr_string(dice->unit->directory, CSR_MODEL, model, sizeof(model));
	snprintf(card->longname, sizeof(card->longname),
		 "%s %s (serial %u) at %s, S%d",
		 vendor, model, dev->config_rom[4] & 0x3fffff,
		 dev_name(&dice->unit->device), 100 << dev->max_speed);

	strcpy(card->mixername, "DICE");
}

static void dice_free(struct snd_dice *dice)
{
	snd_dice_stream_destroy_duplex(dice);
	snd_dice_transaction_destroy(dice);
	fw_unit_put(dice->unit);

	mutex_destroy(&dice->mutex);
	kfree(dice);
}

/*
 * This module releases the FireWire unit data after all ALSA character devices
 * are released by applications. This is for releasing stream data or finishing
 * transactions safely. Thus at returning from .remove(), this module still keep
 * references for the unit.
 */
static void dice_card_free(struct snd_card *card)
{
	dice_free(card->private_data);
}

static void do_registration(struct work_struct *work)
{
	struct snd_dice *dice = container_of(work, struct snd_dice, dwork.work);
	int err;

	if (dice->registered)
		return;

	err = snd_card_new(&dice->unit->device, -1, NULL, THIS_MODULE, 0,
			   &dice->card);
	if (err < 0)
		return;

	if (force_two_pcm_support(dice->unit))
		dice->force_two_pcms = true;

	err = snd_dice_transaction_init(dice);
	if (err < 0)
		goto error;

	err = check_clock_caps(dice);
	if (err < 0)
		goto error;

	dice_card_strings(dice);

	snd_dice_create_proc(dice);

	err = snd_dice_create_pcm(dice);
	if (err < 0)
		goto error;

	err = snd_dice_create_midi(dice);
	if (err < 0)
		goto error;

	err = snd_dice_create_hwdep(dice);
	if (err < 0)
		goto error;

	err = snd_card_register(dice->card);
	if (err < 0)
		goto error;

	/*
	 * After registered, dice instance can be released corresponding to
	 * releasing the sound card instance.
	 */
	dice->card->private_free = dice_card_free;
	dice->card->private_data = dice;
	dice->registered = true;

	return;
error:
	snd_dice_transaction_destroy(dice);
	snd_card_free(dice->card);
	dev_info(&dice->unit->device,
		 "Sound card registration failed: %d\n", err);
}

static void schedule_registration(struct snd_dice *dice)
{
	struct fw_card *fw_card = fw_parent_device(dice->unit)->card;
	u64 now, delay;

	now = get_jiffies_64();
	delay = fw_card->reset_jiffies + msecs_to_jiffies(PROBE_DELAY_MS);

	if (time_after64(delay, now))
		delay -= now;
	else
		delay = 0;

	mod_delayed_work(system_wq, &dice->dwork, delay);
}

static int dice_probe(struct fw_unit *unit, const struct ieee1394_device_id *id)
{
	struct snd_dice *dice;
	int err;

	err = check_dice_category(unit);
	if (err < 0)
		return -ENODEV;

	/* Allocate this independent of sound card instance. */
	dice = kzalloc(sizeof(struct snd_dice), GFP_KERNEL);
	if (dice == NULL)
		return -ENOMEM;

	dice->unit = fw_unit_get(unit);
	dev_set_drvdata(&unit->device, dice);

	spin_lock_init(&dice->lock);
	mutex_init(&dice->mutex);
	init_completion(&dice->clock_accepted);
	init_waitqueue_head(&dice->hwdep_wait);

	err = snd_dice_stream_init_duplex(dice);
	if (err < 0) {
		dice_free(dice);
		return err;
	}

	/* Allocate and register this sound card later. */
	INIT_DEFERRABLE_WORK(&dice->dwork, do_registration);
	schedule_registration(dice);

	return 0;
}

static void dice_remove(struct fw_unit *unit)
{
	struct snd_dice *dice = dev_get_drvdata(&unit->device);

	/*
	 * Confirm to stop the work for registration before the sound card is
	 * going to be released. The work is not scheduled again because bus
	 * reset handler is not called anymore.
	 */
	cancel_delayed_work_sync(&dice->dwork);

	if (dice->registered) {
		/* No need to wait for releasing card object in this context. */
		snd_card_free_when_closed(dice->card);
	} else {
		/* Don't forget this case. */
		dice_free(dice);
	}
}

static void dice_bus_reset(struct fw_unit *unit)
{
	struct snd_dice *dice = dev_get_drvdata(&unit->device);

	/* Postpone a workqueue for deferred registration. */
	if (!dice->registered)
		schedule_registration(dice);

	/* The handler address register becomes initialized. */
	snd_dice_transaction_reinit(dice);

	/*
	 * After registration, userspace can start packet streaming, then this
	 * code block works fine.
	 */
	if (dice->registered) {
		mutex_lock(&dice->mutex);
		snd_dice_stream_update_duplex(dice);
		mutex_unlock(&dice->mutex);
	}
}

#define DICE_INTERFACE	0x000001

static const struct ieee1394_device_id dice_id_table[] = {
	{
		.match_flags = IEEE1394_MATCH_VERSION,
		.version     = DICE_INTERFACE,
	},
	{ }
};
MODULE_DEVICE_TABLE(ieee1394, dice_id_table);

static struct fw_driver dice_driver = {
	.driver   = {
		.owner	= THIS_MODULE,
		.name	= KBUILD_MODNAME,
		.bus	= &fw_bus_type,
	},
	.probe    = dice_probe,
	.update   = dice_bus_reset,
	.remove   = dice_remove,
	.id_table = dice_id_table,
};

static int __init alsa_dice_init(void)
{
	return driver_register(&dice_driver.driver);
}

static void __exit alsa_dice_exit(void)
{
	driver_unregister(&dice_driver.driver);
}

module_init(alsa_dice_init);
module_exit(alsa_dice_exit);