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1/* Copyright (c) 2010-2011,2013-2015 The Linux Foundation. All rights reserved.
2 *
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License version 2 and
5 * only version 2 as published by the Free Software Foundation.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
10 * GNU General Public License for more details.
11 *
12 * max98357a.c -- MAX98357A ALSA SoC Codec driver
13 */
14
15#include <linux/device.h>
16#include <linux/err.h>
17#include <linux/gpio.h>
18#include <linux/gpio/consumer.h>
19#include <linux/kernel.h>
20#include <linux/mod_devicetable.h>
21#include <linux/module.h>
22#include <linux/of.h>
23#include <linux/platform_device.h>
24#include <sound/pcm.h>
25#include <sound/soc.h>
26#include <sound/soc-dai.h>
27#include <sound/soc-dapm.h>
28
29static int max98357a_daiops_trigger(struct snd_pcm_substream *substream,
30		int cmd, struct snd_soc_dai *dai)
31{
32	struct gpio_desc *sdmode = snd_soc_dai_get_drvdata(dai);
33
34	switch (cmd) {
35	case SNDRV_PCM_TRIGGER_START:
36	case SNDRV_PCM_TRIGGER_RESUME:
37	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
38		gpiod_set_value(sdmode, 1);
39		break;
40	case SNDRV_PCM_TRIGGER_STOP:
41	case SNDRV_PCM_TRIGGER_SUSPEND:
42	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
43		gpiod_set_value(sdmode, 0);
44		break;
45	}
46
47	return 0;
48}
49
50static const struct snd_soc_dapm_widget max98357a_dapm_widgets[] = {
51	SND_SOC_DAPM_DAC("SDMode", NULL, SND_SOC_NOPM, 0, 0),
52	SND_SOC_DAPM_OUTPUT("Speaker"),
53};
54
55static const struct snd_soc_dapm_route max98357a_dapm_routes[] = {
56	{"Speaker", NULL, "SDMode"},
57};
58
59static int max98357a_codec_probe(struct snd_soc_codec *codec)
60{
61	struct gpio_desc *sdmode;
62
63	sdmode = devm_gpiod_get(codec->dev, "sdmode");
64	if (IS_ERR(sdmode)) {
65		dev_err(codec->dev, "%s() unable to get sdmode GPIO: %ld\n",
66				__func__, PTR_ERR(sdmode));
67		return PTR_ERR(sdmode);
68	}
69	gpiod_direction_output(sdmode, 0);
70	snd_soc_codec_set_drvdata(codec, sdmode);
71
72	return 0;
73}
74
75static struct snd_soc_codec_driver max98357a_codec_driver = {
76	.probe			= max98357a_codec_probe,
77	.dapm_widgets		= max98357a_dapm_widgets,
78	.num_dapm_widgets	= ARRAY_SIZE(max98357a_dapm_widgets),
79	.dapm_routes		= max98357a_dapm_routes,
80	.num_dapm_routes	= ARRAY_SIZE(max98357a_dapm_routes),
81};
82
83static struct snd_soc_dai_ops max98357a_dai_ops = {
84	.trigger	= max98357a_daiops_trigger,
85};
86
87static struct snd_soc_dai_driver max98357a_dai_driver = {
88	.name = "HiFi",
89	.playback = {
90		.stream_name	= "HiFi Playback",
91		.formats	= SNDRV_PCM_FMTBIT_S16 |
92					SNDRV_PCM_FMTBIT_S24 |
93					SNDRV_PCM_FMTBIT_S32,
94		.rates		= SNDRV_PCM_RATE_8000 |
95					SNDRV_PCM_RATE_16000 |
96					SNDRV_PCM_RATE_48000 |
97					SNDRV_PCM_RATE_96000,
98		.rate_min	= 8000,
99		.rate_max	= 96000,
100		.channels_min	= 1,
101		.channels_max	= 2,
102	},
103	.ops    = &max98357a_dai_ops,
104};
105
106static int max98357a_platform_probe(struct platform_device *pdev)
107{
108	int ret;
109
110	ret = snd_soc_register_codec(&pdev->dev, &max98357a_codec_driver,
111			&max98357a_dai_driver, 1);
112	if (ret)
113		dev_err(&pdev->dev, "%s() error registering codec driver: %d\n",
114				__func__, ret);
115
116	return ret;
117}
118
119static int max98357a_platform_remove(struct platform_device *pdev)
120{
121	snd_soc_unregister_codec(&pdev->dev);
122
123	return 0;
124}
125
126#ifdef CONFIG_OF
127static const struct of_device_id max98357a_device_id[] = {
128	{ .compatible = "maxim,max98357a" },
129	{}
130};
131MODULE_DEVICE_TABLE(of, max98357a_device_id);
132#endif
133
134static struct platform_driver max98357a_platform_driver = {
135	.driver = {
136		.name = "max98357a",
137		.of_match_table = of_match_ptr(max98357a_device_id),
138	},
139	.probe	= max98357a_platform_probe,
140	.remove = max98357a_platform_remove,
141};
142module_platform_driver(max98357a_platform_driver);
143
144MODULE_DESCRIPTION("Maxim MAX98357A Codec Driver");
145MODULE_LICENSE("GPL v2");
146