summaryrefslogtreecommitdiffstats
path: root/sound/firewire/dice/dice.c
blob: 70a111d7f428af4a0487f80cf350767935c8cac0 (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
/*
 * 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 DICE_CATEGORY_ID	0x04
#define WEISS_CATEGORY_ID	0x00

static int dice_interface_check(struct fw_unit *unit)
{
	static const int min_values[10] = {
		10, 0x64 / 4,
		10, 0x18 / 4,
		10, 0x18 / 4,
		0, 0,
		0, 0,
	};
	struct fw_device *device = fw_parent_device(unit);
	struct fw_csr_iterator it;
	int key, val, vendor = -1, model = -1, err;
	unsigned int category, i;
	__be32 *pointers, value;
	__be32 version;

	pointers = kmalloc_array(ARRAY_SIZE(min_values), sizeof(__be32),
				 GFP_KERNEL);
	if (pointers == NULL)
		return -ENOMEM;

	/*
	 * 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_WEISS)
		category = WEISS_CATEGORY_ID;
	else
		category = DICE_CATEGORY_ID;
	if (device->config_rom[3] != ((vendor << 8) | category) ||
	    device->config_rom[4] >> 22 != model) {
		err = -ENODEV;
		goto end;
	}

	/*
	 * Check that the sub address spaces exist and are located inside the
	 * private address space.  The minimum values are chosen so that all
	 * minimally required registers are included.
	 */
	err = snd_fw_transaction(unit, TCODE_READ_BLOCK_REQUEST,
				 DICE_PRIVATE_SPACE, pointers,
				 sizeof(__be32) * ARRAY_SIZE(min_values), 0);
	if (err < 0) {
		err = -ENODEV;
		goto end;
	}
	for (i = 0; i < ARRAY_SIZE(min_values); ++i) {
		value = be32_to_cpu(pointers[i]);
		if (value < min_values[i] || value >= 0x40000) {
			err = -ENODEV;
			goto end;
		}
	}

	/*
	 * Check that the implemented DICE driver specification major version
	 * number matches.
	 */
	err = snd_fw_transaction(unit, TCODE_READ_QUADLET_REQUEST,
				 DICE_PRIVATE_SPACE +
				 be32_to_cpu(pointers[0]) * 4 + GLOBAL_VERSION,
				 &version, 4, 0);
	if (err < 0) {
		err = -ENODEV;
		goto end;
	}
	if ((version & cpu_to_be32(0xff000000)) != cpu_to_be32(0x01000000)) {
		dev_err(&unit->device,
			"unknown DICE version: 0x%08x\n", be32_to_cpu(version));
		err = -ENODEV;
		goto end;
	}
end:
	return err;
}

static int highest_supported_mode_rate(struct snd_dice *dice,
				       unsigned int mode, unsigned int *rate)
{
	unsigned int i, m;

	for (i = ARRAY_SIZE(snd_dice_rates); i > 0; i--) {
		*rate = snd_dice_rates[i - 1];
		if (snd_dice_stream_get_rate_mode(dice, *rate, &m) < 0)
			continue;
		if (mode == m)
			break;
	}
	if (i == 0)
		return -EINVAL;

	return 0;
}

static int dice_read_mode_params(struct snd_dice *dice, unsigned int mode)
{
	__be32 values[2];
	unsigned int rate;
	int err;

	if (highest_supported_mode_rate(dice, mode, &rate) < 0) {
		dice->tx_channels[mode] = 0;
		dice->tx_midi_ports[mode] = 0;
		dice->rx_channels[mode] = 0;
		dice->rx_midi_ports[mode] = 0;
		return 0;
	}

	err = snd_dice_transaction_set_rate(dice, rate);
	if (err < 0)
		return err;

	err = snd_dice_transaction_read_tx(dice, TX_NUMBER_AUDIO,
					   values, sizeof(values));
	if (err < 0)
		return err;

	dice->tx_channels[mode]   = be32_to_cpu(values[0]);
	dice->tx_midi_ports[mode] = be32_to_cpu(values[1]);

	err = snd_dice_transaction_read_rx(dice, RX_NUMBER_AUDIO,
					   values, sizeof(values));
	if (err < 0)
		return err;

	dice->rx_channels[mode]   = be32_to_cpu(values[0]);
	dice->rx_midi_ports[mode] = be32_to_cpu(values[1]);

	return 0;
}

static int dice_read_params(struct snd_dice *dice)
{
	__be32 value;
	int mode, 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;
	}

	for (mode = 2; mode >= 0; --mode) {
		err = dice_read_mode_params(dice, mode);
		if (err < 0)
			return err;
	}

	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");
}

/*
 * 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)
{
	struct snd_dice *dice = card->private_data;

	snd_dice_stream_destroy_duplex(dice);
	snd_dice_transaction_destroy(dice);
	fw_unit_put(dice->unit);

	mutex_destroy(&dice->mutex);
}

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

	err = dice_interface_check(unit);
	if (err < 0)
		goto end;

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

	dice = card->private_data;
	dice->card = card;
	dice->unit = fw_unit_get(unit);
	card->private_free = dice_card_free;

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

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

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

	dice_card_strings(dice);

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

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

	snd_dice_create_proc(dice);

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

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

	err = snd_card_register(card);
	if (err < 0) {
		snd_dice_stream_destroy_duplex(dice);
		goto error;
	}

	dev_set_drvdata(&unit->device, dice);
end:
	return err;
error:
	snd_card_free(card);
	return err;
}

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

	/* No need to wait for releasing card object in this context. */
	snd_card_free_when_closed(dice->card);
}

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

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

	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);
OpenPOWER on IntegriCloud