summaryrefslogtreecommitdiff
path: root/sound/soc/codecs/wm8524.c
blob: 4e9ab542f648ec71cd80628b85ca1bdb2650fc71 (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
// SPDX-License-Identifier: GPL-2.0-only
/*
 * wm8524.c  --  WM8524 ALSA SoC Audio driver
 *
 * Copyright 2009 Wolfson Microelectronics plc
 * Copyright 2017 NXP
 *
 * Based on WM8523 ALSA SoC Audio driver written by Mark Brown
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/gpio/consumer.h>
#include <linux/of_device.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/initval.h>

#define WM8524_NUM_RATES 7

/* codec private data */
struct wm8524_priv {
	struct gpio_desc *mute;
	unsigned int sysclk;
	unsigned int rate_constraint_list[WM8524_NUM_RATES];
	struct snd_pcm_hw_constraint_list rate_constraint;
};


static const struct snd_soc_dapm_widget wm8524_dapm_widgets[] = {
SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0),
SND_SOC_DAPM_OUTPUT("LINEVOUTL"),
SND_SOC_DAPM_OUTPUT("LINEVOUTR"),
};

static const struct snd_soc_dapm_route wm8524_dapm_routes[] = {
	{ "LINEVOUTL", NULL, "DAC" },
	{ "LINEVOUTR", NULL, "DAC" },
};

static const struct {
	int value;
	int ratio;
} lrclk_ratios[WM8524_NUM_RATES] = {
	{ 1, 128 },
	{ 2, 192 },
	{ 3, 256 },
	{ 4, 384 },
	{ 5, 512 },
	{ 6, 768 },
	{ 7, 1152 },
};

static int wm8524_startup(struct snd_pcm_substream *substream,
			  struct snd_soc_dai *dai)
{
	struct snd_soc_component *component = dai->component;
	struct wm8524_priv *wm8524 = snd_soc_component_get_drvdata(component);

	/* The set of sample rates that can be supported depends on the
	 * MCLK supplied to the CODEC - enforce this.
	 */
	if (!wm8524->sysclk) {
		dev_err(component->dev,
			"No MCLK configured, call set_sysclk() on init\n");
		return -EINVAL;
	}

	snd_pcm_hw_constraint_list(substream->runtime, 0,
				   SNDRV_PCM_HW_PARAM_RATE,
				   &wm8524->rate_constraint);

	gpiod_set_value_cansleep(wm8524->mute, 1);

	return 0;
}

static void wm8524_shutdown(struct snd_pcm_substream *substream,
			  struct snd_soc_dai *dai)
{
	struct snd_soc_component *component = dai->component;
	struct wm8524_priv *wm8524 = snd_soc_component_get_drvdata(component);

	gpiod_set_value_cansleep(wm8524->mute, 0);
}

static int wm8524_set_dai_sysclk(struct snd_soc_dai *codec_dai,
		int clk_id, unsigned int freq, int dir)
{
	struct snd_soc_component *component = codec_dai->component;
	struct wm8524_priv *wm8524 = snd_soc_component_get_drvdata(component);
	unsigned int val;
	int i, j = 0;

	wm8524->sysclk = freq;

	wm8524->rate_constraint.count = 0;
	for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) {
		val = freq / lrclk_ratios[i].ratio;
		/* Check that it's a standard rate since core can't
		 * cope with others and having the odd rates confuses
		 * constraint matching.
		 */
		switch (val) {
		case 8000:
		case 32000:
		case 44100:
		case 48000:
		case 88200:
		case 96000:
		case 176400:
		case 192000:
			dev_dbg(component->dev, "Supported sample rate: %dHz\n",
				val);
			wm8524->rate_constraint_list[j++] = val;
			wm8524->rate_constraint.count++;
			break;
		default:
			dev_dbg(component->dev, "Skipping sample rate: %dHz\n",
				val);
		}
	}

	/* Need at least one supported rate... */
	if (wm8524->rate_constraint.count == 0)
		return -EINVAL;

	return 0;
}

static int wm8524_set_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
{
	fmt &= (SND_SOC_DAIFMT_FORMAT_MASK | SND_SOC_DAIFMT_INV_MASK |
		SND_SOC_DAIFMT_MASTER_MASK);

	if (fmt != (SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
		    SND_SOC_DAIFMT_CBS_CFS)) {
		dev_err(codec_dai->dev, "Invalid DAI format\n");
		return -EINVAL;
	}

	return 0;
}

static int wm8524_mute_stream(struct snd_soc_dai *dai, int mute, int stream)
{
	struct wm8524_priv *wm8524 = snd_soc_component_get_drvdata(dai->component);

	if (wm8524->mute)
		gpiod_set_value_cansleep(wm8524->mute, mute);

	return 0;
}

#define WM8524_RATES SNDRV_PCM_RATE_8000_192000

#define WM8524_FORMATS (SNDRV_PCM_FMTBIT_S16_LE |\
			SNDRV_PCM_FMTBIT_S24_LE |\
			SNDRV_PCM_FMTBIT_S32_LE)

static const struct snd_soc_dai_ops wm8524_dai_ops = {
	.startup	= wm8524_startup,
	.shutdown	= wm8524_shutdown,
	.set_sysclk	= wm8524_set_dai_sysclk,
	.set_fmt	= wm8524_set_fmt,
	.mute_stream	= wm8524_mute_stream,
};

static struct snd_soc_dai_driver wm8524_dai = {
	.name = "wm8524-hifi",
	.playback = {
		.stream_name = "Playback",
		.channels_min = 2,
		.channels_max = 2,
		.rates = WM8524_RATES,
		.formats = WM8524_FORMATS,
	},
	.ops = &wm8524_dai_ops,
};

static int wm8524_probe(struct snd_soc_component *component)
{
	struct wm8524_priv *wm8524 = snd_soc_component_get_drvdata(component);

	wm8524->rate_constraint.list = &wm8524->rate_constraint_list[0];
	wm8524->rate_constraint.count =
		ARRAY_SIZE(wm8524->rate_constraint_list);

	return 0;
}

static const struct snd_soc_component_driver soc_component_dev_wm8524 = {
	.probe			= wm8524_probe,
	.dapm_widgets		= wm8524_dapm_widgets,
	.num_dapm_widgets	= ARRAY_SIZE(wm8524_dapm_widgets),
	.dapm_routes		= wm8524_dapm_routes,
	.num_dapm_routes	= ARRAY_SIZE(wm8524_dapm_routes),
	.idle_bias_on		= 1,
	.use_pmdown_time	= 1,
	.endianness		= 1,
	.non_legacy_dai_naming	= 1,
};

static const struct of_device_id wm8524_of_match[] = {
	{ .compatible = "wlf,wm8524" },
	{ /* sentinel*/ }
};
MODULE_DEVICE_TABLE(of, wm8524_of_match);

static int wm8524_codec_probe(struct platform_device *pdev)
{
	struct wm8524_priv *wm8524;
	int ret;

	wm8524 = devm_kzalloc(&pdev->dev, sizeof(struct wm8524_priv),
						  GFP_KERNEL);
	if (wm8524 == NULL)
		return -ENOMEM;

	platform_set_drvdata(pdev, wm8524);

	wm8524->mute = devm_gpiod_get(&pdev->dev, "wlf,mute", GPIOD_OUT_LOW);
	if (IS_ERR(wm8524->mute)) {
		ret = PTR_ERR(wm8524->mute);
		dev_err(&pdev->dev, "Failed to get mute line: %d\n", ret);
		return ret;
	}

	ret = devm_snd_soc_register_component(&pdev->dev,
			&soc_component_dev_wm8524, &wm8524_dai, 1);
	if (ret < 0)
		dev_err(&pdev->dev, "Failed to register component: %d\n", ret);

	return ret;
}

static struct platform_driver wm8524_codec_driver = {
	.probe		= wm8524_codec_probe,
	.driver		= {
		.name	= "wm8524-codec",
		.of_match_table = wm8524_of_match,
	},
};
module_platform_driver(wm8524_codec_driver);

MODULE_DESCRIPTION("ASoC WM8524 driver");
MODULE_AUTHOR("Mihai Serban <mihai.serban@nxp.com>");
MODULE_ALIAS("platform:wm8524-codec");
MODULE_LICENSE("GPL");