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	if (!sdmode)
35		return 0;
36
37	switch (cmd) {
38	case SNDRV_PCM_TRIGGER_START:
39	case SNDRV_PCM_TRIGGER_RESUME:
40	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
41		gpiod_set_value(sdmode, 1);
42		break;
43	case SNDRV_PCM_TRIGGER_STOP:
44	case SNDRV_PCM_TRIGGER_SUSPEND:
45	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
46		gpiod_set_value(sdmode, 0);
47		break;
48	}
49
50	return 0;
51}
52
53static const struct snd_soc_dapm_widget max98357a_dapm_widgets[] = {
54	SND_SOC_DAPM_OUTPUT("Speaker"),
55};
56
57static const struct snd_soc_dapm_route max98357a_dapm_routes[] = {
58	{"Speaker", NULL, "HiFi Playback"},
59};
60
61static int max98357a_codec_probe(struct snd_soc_codec *codec)
62{
63	struct gpio_desc *sdmode;
64
65	sdmode = devm_gpiod_get_optional(codec->dev, "sdmode", GPIOD_OUT_LOW);
66	if (IS_ERR(sdmode))
67		return PTR_ERR(sdmode);
68
69	snd_soc_codec_set_drvdata(codec, sdmode);
70
71	return 0;
72}
73
74static struct snd_soc_codec_driver max98357a_codec_driver = {
75	.probe			= max98357a_codec_probe,
76	.dapm_widgets		= max98357a_dapm_widgets,
77	.num_dapm_widgets	= ARRAY_SIZE(max98357a_dapm_widgets),
78	.dapm_routes		= max98357a_dapm_routes,
79	.num_dapm_routes	= ARRAY_SIZE(max98357a_dapm_routes),
80};
81
82static const struct snd_soc_dai_ops max98357a_dai_ops = {
83	.trigger	= max98357a_daiops_trigger,
84};
85
86static struct snd_soc_dai_driver max98357a_dai_driver = {
87	.name = "HiFi",
88	.playback = {
89		.stream_name	= "HiFi Playback",
90		.formats	= SNDRV_PCM_FMTBIT_S16 |
91					SNDRV_PCM_FMTBIT_S24 |
92					SNDRV_PCM_FMTBIT_S32,
93		.rates		= SNDRV_PCM_RATE_8000 |
94					SNDRV_PCM_RATE_16000 |
95					SNDRV_PCM_RATE_48000 |
96					SNDRV_PCM_RATE_96000,
97		.rate_min	= 8000,
98		.rate_max	= 96000,
99		.channels_min	= 1,
100		.channels_max	= 2,
101	},
102	.ops    = &max98357a_dai_ops,
103};
104
105static int max98357a_platform_probe(struct platform_device *pdev)
106{
107	return snd_soc_register_codec(&pdev->dev, &max98357a_codec_driver,
108			&max98357a_dai_driver, 1);
109}
110
111static int max98357a_platform_remove(struct platform_device *pdev)
112{
113	snd_soc_unregister_codec(&pdev->dev);
114
115	return 0;
116}
117
118#ifdef CONFIG_OF
119static const struct of_device_id max98357a_device_id[] = {
120	{ .compatible = "maxim,max98357a" },
121	{}
122};
123MODULE_DEVICE_TABLE(of, max98357a_device_id);
124#endif
125
126static struct platform_driver max98357a_platform_driver = {
127	.driver = {
128		.name = "max98357a",
129		.of_match_table = of_match_ptr(max98357a_device_id),
130	},
131	.probe	= max98357a_platform_probe,
132	.remove = max98357a_platform_remove,
133};
134module_platform_driver(max98357a_platform_driver);
135
136MODULE_DESCRIPTION("Maxim MAX98357A Codec Driver");
137MODULE_LICENSE("GPL v2");
138