summaryrefslogtreecommitdiffstats
path: root/sound/soc/atmel/tse850-pcm5142.c
blob: ac6a814c8ecf3658ffb20e1aa5bc7dce63b039c9 (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
/*
 * TSE-850 audio - ASoC driver for the Axentia TSE-850 with a PCM5142 codec
 *
 * Copyright (C) 2016 Axentia Technologies AB
 *
 * Author: Peter Rosin <peda@axentia.se>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

/*
 *               loop1 relays
 *   IN1 +---o  +------------+  o---+ OUT1
 *            \                /
 *             +              +
 *             |   /          |
 *             +--o  +--.     |
 *             |  add   |     |
 *             |        V     |
 *             |      .---.   |
 *   DAC +----------->|Sum|---+
 *             |      '---'   |
 *             |              |
 *             +              +
 *
 *   IN2 +---o--+------------+--o---+ OUT2
 *               loop2 relays
 *
 * The 'loop1' gpio pin controlls two relays, which are either in loop
 * position, meaning that input and output are directly connected, or
 * they are in mixer position, meaning that the signal is passed through
 * the 'Sum' mixer. Similarly for 'loop2'.
 *
 * In the above, the 'loop1' relays are inactive, thus feeding IN1 to the
 * mixer (if 'add' is active) and feeding the mixer output to OUT1. The
 * 'loop2' relays are active, short-cutting the TSE-850 from channel 2.
 * IN1, IN2, OUT1 and OUT2 are TSE-850 connectors and DAC is the PCB name
 * of the (filtered) output from the PCM5142 codec.
 */

#include <linux/clk.h>
#include <linux/gpio.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <linux/regulator/consumer.h>

#include <sound/soc.h>
#include <sound/pcm_params.h>

#include "atmel_ssc_dai.h"

struct tse850_priv {
	int ssc_id;

	struct gpio_desc *add;
	struct gpio_desc *loop1;
	struct gpio_desc *loop2;

	struct regulator *ana;

	int add_cache;
	int loop1_cache;
	int loop2_cache;
};

static int tse850_get_mux1(struct snd_kcontrol *kctrl,
			   struct snd_ctl_elem_value *ucontrol)
{
	struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
	struct snd_soc_card *card = dapm->card;
	struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);

	ucontrol->value.enumerated.item[0] = tse850->loop1_cache;

	return 0;
}

static int tse850_put_mux1(struct snd_kcontrol *kctrl,
			   struct snd_ctl_elem_value *ucontrol)
{
	struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
	struct snd_soc_card *card = dapm->card;
	struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
	struct soc_enum *e = (struct soc_enum *)kctrl->private_value;
	unsigned int val = ucontrol->value.enumerated.item[0];

	if (val >= e->items)
		return -EINVAL;

	gpiod_set_value_cansleep(tse850->loop1, val);
	tse850->loop1_cache = val;

	return snd_soc_dapm_put_enum_double(kctrl, ucontrol);
}

static int tse850_get_mux2(struct snd_kcontrol *kctrl,
			   struct snd_ctl_elem_value *ucontrol)
{
	struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
	struct snd_soc_card *card = dapm->card;
	struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);

	ucontrol->value.enumerated.item[0] = tse850->loop2_cache;

	return 0;
}

static int tse850_put_mux2(struct snd_kcontrol *kctrl,
			   struct snd_ctl_elem_value *ucontrol)
{
	struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
	struct snd_soc_card *card = dapm->card;
	struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
	struct soc_enum *e = (struct soc_enum *)kctrl->private_value;
	unsigned int val = ucontrol->value.enumerated.item[0];

	if (val >= e->items)
		return -EINVAL;

	gpiod_set_value_cansleep(tse850->loop2, val);
	tse850->loop2_cache = val;

	return snd_soc_dapm_put_enum_double(kctrl, ucontrol);
}

int tse850_get_mix(struct snd_kcontrol *kctrl,
		   struct snd_ctl_elem_value *ucontrol)
{
	struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
	struct snd_soc_card *card = dapm->card;
	struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);

	ucontrol->value.enumerated.item[0] = tse850->add_cache;

	return 0;
}

int tse850_put_mix(struct snd_kcontrol *kctrl,
		   struct snd_ctl_elem_value *ucontrol)
{
	struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
	struct snd_soc_card *card = dapm->card;
	struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
	int connect = !!ucontrol->value.integer.value[0];

	if (tse850->add_cache == connect)
		return 0;

	/*
	 * Hmmm, this gpiod_set_value_cansleep call should probably happen
	 * inside snd_soc_dapm_mixer_update_power in the loop.
	 */
	gpiod_set_value_cansleep(tse850->add, connect);
	tse850->add_cache = connect;

	snd_soc_dapm_mixer_update_power(dapm, kctrl, connect, NULL);
	return 1;
}

int tse850_get_ana(struct snd_kcontrol *kctrl,
		   struct snd_ctl_elem_value *ucontrol)
{
	struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
	struct snd_soc_card *card = dapm->card;
	struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
	int ret;

	ret = regulator_get_voltage(tse850->ana);
	if (ret < 0)
		return ret;

	/*
	 * Map regulator output values like so:
	 *      -11.5V to "Low" (enum 0)
	 * 11.5V-12.5V to "12V" (enum 1)
	 * 12.5V-13.5V to "13V" (enum 2)
	 *     ...
	 * 18.5V-19.5V to "19V" (enum 8)
	 * 19.5V-      to "20V" (enum 9)
	 */
	if (ret < 11000000)
		ret = 11000000;
	else if (ret > 20000000)
		ret = 20000000;
	ret -= 11000000;
	ret = (ret + 500000) / 1000000;

	ucontrol->value.enumerated.item[0] = ret;

	return 0;
}

int tse850_put_ana(struct snd_kcontrol *kctrl,
		   struct snd_ctl_elem_value *ucontrol)
{
	struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
	struct snd_soc_card *card = dapm->card;
	struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
	struct soc_enum *e = (struct soc_enum *)kctrl->private_value;
	unsigned int uV = ucontrol->value.enumerated.item[0];
	int ret;

	if (uV >= e->items)
		return -EINVAL;

	/*
	 * Map enum zero (Low) to 2 volts on the regulator, do this since
	 * the ana regulator is supplied by the system 12V voltage and
	 * requesting anything below the system voltage causes the system
	 * voltage to be passed through the regulator. Also, the ana
	 * regulator induces noise when requesting voltages near the
	 * system voltage. So, by mapping Low to 2V, that noise is
	 * eliminated when all that is needed is 12V (the system voltage).
	 */
	if (uV)
		uV = 11000000 + (1000000 * uV);
	else
		uV = 2000000;

	ret = regulator_set_voltage(tse850->ana, uV, uV);
	if (ret < 0)
		return ret;

	return snd_soc_dapm_put_enum_double(kctrl, ucontrol);
}

static const char * const mux_text[] = { "Mixer", "Loop" };

static const struct soc_enum mux_enum =
	SOC_ENUM_SINGLE(SND_SOC_NOPM, 0, 2, mux_text);

static const struct snd_kcontrol_new mux1 =
	SOC_DAPM_ENUM_EXT("MUX1", mux_enum, tse850_get_mux1, tse850_put_mux1);

static const struct snd_kcontrol_new mux2 =
	SOC_DAPM_ENUM_EXT("MUX2", mux_enum, tse850_get_mux2, tse850_put_mux2);

#define TSE850_DAPM_SINGLE_EXT(xname, reg, shift, max, invert, xget, xput) \
{	.iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
	.info = snd_soc_info_volsw, \
	.get = xget, \
	.put = xput, \
	.private_value = SOC_SINGLE_VALUE(reg, shift, max, invert, 0) }

static const struct snd_kcontrol_new mix[] = {
	TSE850_DAPM_SINGLE_EXT("IN Switch", SND_SOC_NOPM, 0, 1, 0,
			       tse850_get_mix, tse850_put_mix),
};

static const char * const ana_text[] = {
	"Low", "12V", "13V", "14V", "15V", "16V", "17V", "18V", "19V", "20V"
};

static const struct soc_enum ana_enum =
	SOC_ENUM_SINGLE(SND_SOC_NOPM, 0, 9, ana_text);

static const struct snd_kcontrol_new out =
	SOC_DAPM_ENUM_EXT("ANA", ana_enum, tse850_get_ana, tse850_put_ana);

static const struct snd_soc_dapm_widget tse850_dapm_widgets[] = {
	SND_SOC_DAPM_LINE("OUT1", NULL),
	SND_SOC_DAPM_LINE("OUT2", NULL),
	SND_SOC_DAPM_LINE("IN1", NULL),
	SND_SOC_DAPM_LINE("IN2", NULL),
	SND_SOC_DAPM_INPUT("DAC"),
	SND_SOC_DAPM_AIF_IN("AIFINL", "Playback", 0, SND_SOC_NOPM, 0, 0),
	SND_SOC_DAPM_AIF_IN("AIFINR", "Playback", 1, SND_SOC_NOPM, 0, 0),
	SOC_MIXER_ARRAY("MIX", SND_SOC_NOPM, 0, 0, mix),
	SND_SOC_DAPM_MUX("MUX1", SND_SOC_NOPM, 0, 0, &mux1),
	SND_SOC_DAPM_MUX("MUX2", SND_SOC_NOPM, 0, 0, &mux2),
	SND_SOC_DAPM_OUT_DRV("OUT", SND_SOC_NOPM, 0, 0, &out, 1),
};

/*
 * These connections are not entirely correct, since both IN1 and IN2
 * are always fed to MIX (if the "IN switch" is set so), i.e. without
 * regard to the loop1 and loop2 relays that according to this only
 * control MUX1 and MUX2 but in fact also control how the input signals
 * are routed.
 * But, 1) I don't know how to do it right, and 2) it doesn't seem to
 * matter in practice since nothing is powered in those sections anyway.
 */
static const struct snd_soc_dapm_route tse850_intercon[] = {
	{ "OUT1", NULL, "MUX1" },
	{ "OUT2", NULL, "MUX2" },

	{ "MUX1", "Loop",  "IN1" },
	{ "MUX1", "Mixer", "OUT" },

	{ "MUX2", "Loop",  "IN2" },
	{ "MUX2", "Mixer", "OUT" },

	{ "OUT", NULL, "MIX" },

	{ "MIX", NULL, "DAC" },
	{ "MIX", "IN Switch", "IN1" },
	{ "MIX", "IN Switch", "IN2" },

	/* connect board input to the codec left channel output pin */
	{ "DAC", NULL, "OUTL" },
};

static struct snd_soc_dai_link tse850_dailink = {
	.name = "TSE-850",
	.stream_name = "TSE-850-PCM",
	.codec_dai_name = "pcm512x-hifi",
	.dai_fmt = SND_SOC_DAIFMT_I2S
		 | SND_SOC_DAIFMT_NB_NF
		 | SND_SOC_DAIFMT_CBM_CFS,
};

static struct snd_soc_card tse850_card = {
	.name = "TSE-850-ASoC",
	.owner = THIS_MODULE,
	.dai_link = &tse850_dailink,
	.num_links = 1,
	.dapm_widgets = tse850_dapm_widgets,
	.num_dapm_widgets = ARRAY_SIZE(tse850_dapm_widgets),
	.dapm_routes = tse850_intercon,
	.num_dapm_routes = ARRAY_SIZE(tse850_intercon),
	.fully_routed = true,
};

static int tse850_dt_init(struct platform_device *pdev)
{
	struct device_node *np = pdev->dev.of_node;
	struct device_node *codec_np, *cpu_np;
	struct snd_soc_card *card = &tse850_card;
	struct snd_soc_dai_link *dailink = &tse850_dailink;
	struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);

	if (!np) {
		dev_err(&pdev->dev, "only device tree supported\n");
		return -EINVAL;
	}

	cpu_np = of_parse_phandle(np, "axentia,ssc-controller", 0);
	if (!cpu_np) {
		dev_err(&pdev->dev, "failed to get dai and pcm info\n");
		return -EINVAL;
	}
	dailink->cpu_of_node = cpu_np;
	dailink->platform_of_node = cpu_np;
	tse850->ssc_id = of_alias_get_id(cpu_np, "ssc");
	of_node_put(cpu_np);

	codec_np = of_parse_phandle(np, "axentia,audio-codec", 0);
	if (!codec_np) {
		dev_err(&pdev->dev, "failed to get codec info\n");
		return -EINVAL;
	}
	dailink->codec_of_node = codec_np;
	of_node_put(codec_np);

	return 0;
}

static int tse850_probe(struct platform_device *pdev)
{
	struct snd_soc_card *card = &tse850_card;
	struct device *dev = card->dev = &pdev->dev;
	struct tse850_priv *tse850;
	int ret;

	tse850 = devm_kzalloc(dev, sizeof(*tse850), GFP_KERNEL);
	if (!tse850)
		return -ENOMEM;

	snd_soc_card_set_drvdata(card, tse850);

	ret = tse850_dt_init(pdev);
	if (ret) {
		dev_err(dev, "failed to init dt info\n");
		return ret;
	}

	tse850->add = devm_gpiod_get(dev, "axentia,add", GPIOD_OUT_HIGH);
	if (IS_ERR(tse850->add)) {
		if (PTR_ERR(tse850->add) != -EPROBE_DEFER)
			dev_err(dev, "failed to get 'add' gpio\n");
		return PTR_ERR(tse850->add);
	}
	tse850->add_cache = 1;

	tse850->loop1 = devm_gpiod_get(dev, "axentia,loop1", GPIOD_OUT_HIGH);
	if (IS_ERR(tse850->loop1)) {
		if (PTR_ERR(tse850->loop1) != -EPROBE_DEFER)
			dev_err(dev, "failed to get 'loop1' gpio\n");
		return PTR_ERR(tse850->loop1);
	}
	tse850->loop1_cache = 1;

	tse850->loop2 = devm_gpiod_get(dev, "axentia,loop2", GPIOD_OUT_HIGH);
	if (IS_ERR(tse850->loop2)) {
		if (PTR_ERR(tse850->loop2) != -EPROBE_DEFER)
			dev_err(dev, "failed to get 'loop2' gpio\n");
		return PTR_ERR(tse850->loop2);
	}
	tse850->loop2_cache = 1;

	tse850->ana = devm_regulator_get(dev, "axentia,ana");
	if (IS_ERR(tse850->ana)) {
		if (PTR_ERR(tse850->ana) != -EPROBE_DEFER)
			dev_err(dev, "failed to get 'ana' regulator\n");
		return PTR_ERR(tse850->ana);
	}

	ret = regulator_enable(tse850->ana);
	if (ret < 0) {
		dev_err(dev, "failed to enable the 'ana' regulator\n");
		return ret;
	}

	ret = atmel_ssc_set_audio(tse850->ssc_id);
	if (ret != 0) {
		dev_err(dev,
			"failed to set SSC %d for audio\n", tse850->ssc_id);
		goto err_disable_ana;
	}

	ret = snd_soc_register_card(card);
	if (ret) {
		dev_err(dev, "snd_soc_register_card failed\n");
		goto err_put_audio;
	}

	return 0;

err_put_audio:
	atmel_ssc_put_audio(tse850->ssc_id);
err_disable_ana:
	regulator_disable(tse850->ana);
	return ret;
}

static int tse850_remove(struct platform_device *pdev)
{
	struct snd_soc_card *card = platform_get_drvdata(pdev);
	struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);

	snd_soc_unregister_card(card);
	atmel_ssc_put_audio(tse850->ssc_id);
	regulator_disable(tse850->ana);

	return 0;
}

static const struct of_device_id tse850_dt_ids[] = {
	{ .compatible = "axentia,tse850-pcm5142", },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, tse850_dt_ids);

static struct platform_driver tse850_driver = {
	.driver = {
		.name = "axentia-tse850-pcm5142",
		.of_match_table = of_match_ptr(tse850_dt_ids),
	},
	.probe = tse850_probe,
	.remove = tse850_remove,
};

module_platform_driver(tse850_driver);

/* Module information */
MODULE_AUTHOR("Peter Rosin <peda@axentia.se>");
MODULE_DESCRIPTION("ALSA SoC driver for TSE-850 with PCM5142 codec");
MODULE_LICENSE("GPL");
OpenPOWER on IntegriCloud