summaryrefslogtreecommitdiffstats
path: root/sound/soc/samsung/s3c24xx_simtec.c
blob: c8d525bf6122ea43f513231aab28f644681e9ae5 (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
/* sound/soc/samsung/s3c24xx_simtec.c
 *
 * Copyright 2009 Simtec Electronics
 *
 * 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.
*/

#include <linux/gpio.h>
#include <linux/clk.h>

#include <sound/soc.h>

#include <plat/audio-simtec.h>

#include "s3c24xx-i2s.h"
#include "s3c24xx_simtec.h"

static struct s3c24xx_audio_simtec_pdata *pdata;
static struct clk *xtal_clk;

static int spk_gain;
static int spk_unmute;

/**
 * speaker_gain_get - read the speaker gain setting.
 * @kcontrol: The control for the speaker gain.
 * @ucontrol: The value that needs to be updated.
 *
 * Read the value for the AMP gain control.
 */
static int speaker_gain_get(struct snd_kcontrol *kcontrol,
			    struct snd_ctl_elem_value *ucontrol)
{
	ucontrol->value.integer.value[0] = spk_gain;
	return 0;
}

/**
 * speaker_gain_set - set the value of the speaker amp gain
 * @value: The value to write.
 */
static void speaker_gain_set(int value)
{
	gpio_set_value_cansleep(pdata->amp_gain[0], value & 1);
	gpio_set_value_cansleep(pdata->amp_gain[1], value >> 1);
}

/**
 * speaker_gain_put - set the speaker gain setting.
 * @kcontrol: The control for the speaker gain.
 * @ucontrol: The value that needs to be set.
 *
 * Set the value of the speaker gain from the specified
 * @ucontrol setting.
 *
 * Note, if the speaker amp is muted, then we do not set a gain value
 * as at-least one of the ICs that is fitted will try and power up even
 * if the main control is set to off.
 */
static int speaker_gain_put(struct snd_kcontrol *kcontrol,
			    struct snd_ctl_elem_value *ucontrol)
{
	int value = ucontrol->value.integer.value[0];

	spk_gain = value;

	if (!spk_unmute)
		speaker_gain_set(value);

	return 0;
}

static const struct snd_kcontrol_new amp_gain_controls[] = {
	SOC_SINGLE_EXT("Speaker Gain", 0, 0, 3, 0,
		       speaker_gain_get, speaker_gain_put),
};

/**
 * spk_unmute_state - set the unmute state of the speaker
 * @to: zero to unmute, non-zero to ununmute.
 */
static void spk_unmute_state(int to)
{
	pr_debug("%s: to=%d\n", __func__, to);

	spk_unmute = to;
	gpio_set_value(pdata->amp_gpio, to);

	/* if we're umuting, also re-set the gain */
	if (to && pdata->amp_gain[0] > 0)
		speaker_gain_set(spk_gain);
}

/**
 * speaker_unmute_get - read the speaker unmute setting.
 * @kcontrol: The control for the speaker gain.
 * @ucontrol: The value that needs to be updated.
 *
 * Read the value for the AMP gain control.
 */
static int speaker_unmute_get(struct snd_kcontrol *kcontrol,
			    struct snd_ctl_elem_value *ucontrol)
{
	ucontrol->value.integer.value[0] = spk_unmute;
	return 0;
}

/**
 * speaker_unmute_put - set the speaker unmute setting.
 * @kcontrol: The control for the speaker gain.
 * @ucontrol: The value that needs to be set.
 *
 * Set the value of the speaker gain from the specified
 * @ucontrol setting.
 */
static int speaker_unmute_put(struct snd_kcontrol *kcontrol,
			    struct snd_ctl_elem_value *ucontrol)
{
	spk_unmute_state(ucontrol->value.integer.value[0]);
	return 0;
}

/* This is added as a manual control as the speaker amps create clicks
 * when their power state is changed, which are far more noticeable than
 * anything produced by the CODEC itself.
 */
static const struct snd_kcontrol_new amp_unmute_controls[] = {
	SOC_SINGLE_EXT("Speaker Switch", 0, 0, 1, 0,
		       speaker_unmute_get, speaker_unmute_put),
};

void simtec_audio_init(struct snd_soc_pcm_runtime *rtd)
{
	struct snd_soc_codec *codec = rtd->codec;

	if (pdata->amp_gpio > 0) {
		pr_debug("%s: adding amp routes\n", __func__);

		snd_soc_add_controls(codec, amp_unmute_controls,
				     ARRAY_SIZE(amp_unmute_controls));
	}

	if (pdata->amp_gain[0] > 0) {
		pr_debug("%s: adding amp controls\n", __func__);
		snd_soc_add_controls(codec, amp_gain_controls,
				     ARRAY_SIZE(amp_gain_controls));
	}
}
EXPORT_SYMBOL_GPL(simtec_audio_init);

#define CODEC_CLOCK 12000000

/**
 * simtec_hw_params - update hardware parameters
 * @substream: The audio substream instance.
 * @params: The parameters requested.
 *
 * Update the codec data routing and configuration  settings
 * from the supplied data.
 */
static int simtec_hw_params(struct snd_pcm_substream *substream,
			    struct snd_pcm_hw_params *params)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *codec_dai = rtd->codec_dai;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	int ret;

	/* Set the CODEC as the bus clock master, I2S */
	ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
				  SND_SOC_DAIFMT_NB_NF |
				  SND_SOC_DAIFMT_CBM_CFM);
	if (ret) {
		pr_err("%s: failed set cpu dai format\n", __func__);
		return ret;
	}

	/* Set the CODEC as the bus clock master */
	ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
				  SND_SOC_DAIFMT_NB_NF |
				  SND_SOC_DAIFMT_CBM_CFM);
	if (ret) {
		pr_err("%s: failed set codec dai format\n", __func__);
		return ret;
	}

	ret = snd_soc_dai_set_sysclk(codec_dai, 0,
				     CODEC_CLOCK, SND_SOC_CLOCK_IN);
	if (ret) {
		pr_err( "%s: failed setting codec sysclk\n", __func__);
		return ret;
	}

	if (pdata->use_mpllin) {
		ret = snd_soc_dai_set_sysclk(cpu_dai, S3C24XX_CLKSRC_MPLL,
					     0, SND_SOC_CLOCK_OUT);

		if (ret) {
			pr_err("%s: failed to set MPLLin as clksrc\n",
			       __func__);
			return ret;
		}
	}

	if (pdata->output_cdclk) {
		int cdclk_scale;

		cdclk_scale = clk_get_rate(xtal_clk) / CODEC_CLOCK;
		cdclk_scale--;

		ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C24XX_DIV_PRESCALER,
					     cdclk_scale);
	}

	return 0;
}

static int simtec_call_startup(struct s3c24xx_audio_simtec_pdata *pd)
{
	/* call any board supplied startup code, this currently only
	 * covers the bast/vr1000 which have a CPLD in the way of the
	 * LRCLK */
	if (pd->startup)
		pd->startup();

	return 0;
}

static struct snd_soc_ops simtec_snd_ops = {
	.hw_params	= simtec_hw_params,
};

/**
 * attach_gpio_amp - get and configure the necessary gpios
 * @dev: The device we're probing.
 * @pd: The platform data supplied by the board.
 *
 * If there is a GPIO based amplifier attached to the board, claim
 * the necessary GPIO lines for it, and set default values.
 */
static int attach_gpio_amp(struct device *dev,
			   struct s3c24xx_audio_simtec_pdata *pd)
{
	int ret;

	/* attach gpio amp gain (if any) */
	if (pdata->amp_gain[0] > 0) {
		ret = gpio_request(pd->amp_gain[0], "gpio-amp-gain0");
		if (ret) {
			dev_err(dev, "cannot get amp gpio gain0\n");
			return ret;
		}

		ret = gpio_request(pd->amp_gain[1], "gpio-amp-gain1");
		if (ret) {
			dev_err(dev, "cannot get amp gpio gain1\n");
			gpio_free(pdata->amp_gain[0]);
			return ret;
		}

		gpio_direction_output(pd->amp_gain[0], 0);
		gpio_direction_output(pd->amp_gain[1], 0);
	}

	/* note, currently we assume GPA0 isn't valid amp */
	if (pdata->amp_gpio > 0) {
		ret = gpio_request(pd->amp_gpio, "gpio-amp");
		if (ret) {
			dev_err(dev, "cannot get amp gpio %d (%d)\n",
				pd->amp_gpio, ret);
			goto err_amp;
		}

		/* set the amp off at startup */
		spk_unmute_state(0);
	}

	return 0;

err_amp:
	if (pd->amp_gain[0] > 0) {
		gpio_free(pd->amp_gain[0]);
		gpio_free(pd->amp_gain[1]);
	}

	return ret;
}

static void detach_gpio_amp(struct s3c24xx_audio_simtec_pdata *pd)
{
	if (pd->amp_gain[0] > 0) {
		gpio_free(pd->amp_gain[0]);
		gpio_free(pd->amp_gain[1]);
	}

	if (pd->amp_gpio > 0)
		gpio_free(pd->amp_gpio);
}

#ifdef CONFIG_PM
static int simtec_audio_resume(struct device *dev)
{
	simtec_call_startup(pdata);
	return 0;
}

const struct dev_pm_ops simtec_audio_pmops = {
	.resume	= simtec_audio_resume,
};
EXPORT_SYMBOL_GPL(simtec_audio_pmops);
#endif

int __devinit simtec_audio_core_probe(struct platform_device *pdev,
				      struct snd_soc_card *card)
{
	struct platform_device *snd_dev;
	int ret;

	card->dai_link->ops = &simtec_snd_ops;

	pdata = pdev->dev.platform_data;
	if (!pdata) {
		dev_err(&pdev->dev, "no platform data supplied\n");
		return -EINVAL;
	}

	simtec_call_startup(pdata);

	xtal_clk = clk_get(&pdev->dev, "xtal");
	if (IS_ERR(xtal_clk)) {
		dev_err(&pdev->dev, "could not get clkout0\n");
		return -EINVAL;
	}

	dev_info(&pdev->dev, "xtal rate is %ld\n", clk_get_rate(xtal_clk));

	ret = attach_gpio_amp(&pdev->dev, pdata);
	if (ret)
		goto err_clk;

	snd_dev = platform_device_alloc("soc-audio", -1);
	if (!snd_dev) {
		dev_err(&pdev->dev, "failed to alloc soc-audio devicec\n");
		ret = -ENOMEM;
		goto err_gpio;
	}

	platform_set_drvdata(snd_dev, card);

	ret = platform_device_add(snd_dev);
	if (ret) {
		dev_err(&pdev->dev, "failed to add soc-audio dev\n");
		goto err_pdev;
	}

	platform_set_drvdata(pdev, snd_dev);
	return 0;

err_pdev:
	platform_device_put(snd_dev);

err_gpio:
	detach_gpio_amp(pdata);

err_clk:
	clk_put(xtal_clk);
	return ret;
}
EXPORT_SYMBOL_GPL(simtec_audio_core_probe);

int __devexit simtec_audio_remove(struct platform_device *pdev)
{
	struct platform_device *snd_dev = platform_get_drvdata(pdev);

	platform_device_unregister(snd_dev);

	detach_gpio_amp(pdata);
	clk_put(xtal_clk);
	return 0;
}
EXPORT_SYMBOL_GPL(simtec_audio_remove);

MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
MODULE_DESCRIPTION("ALSA SoC Simtec Audio common support");
MODULE_LICENSE("GPL");
OpenPOWER on IntegriCloud