1 /* Copyright (c) 2010-2011,2013-2015 The Linux Foundation. All rights reserved.
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.
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.
12 * max98357a.c -- MAX98357A ALSA SoC Codec driver
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>
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>
29 static int max98357a_daiops_trigger(struct snd_pcm_substream *substream,
30 int cmd, struct snd_soc_dai *dai)
32 struct gpio_desc *sdmode = snd_soc_dai_get_drvdata(dai);
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);
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);
50 static 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"),
55 static const struct snd_soc_dapm_route max98357a_dapm_routes[] = {
56 {"Speaker", NULL, "SDMode"},
59 static int max98357a_codec_probe(struct snd_soc_codec *codec)
61 struct gpio_desc *sdmode;
63 sdmode = devm_gpiod_get(codec->dev, "sdmode");
65 dev_err(codec->dev, "%s() unable to get sdmode GPIO: %ld\n",
66 __func__, PTR_ERR(sdmode));
67 return PTR_ERR(sdmode);
69 gpiod_direction_output(sdmode, 0);
70 snd_soc_codec_set_drvdata(codec, sdmode);
75 static 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),
83 static struct snd_soc_dai_ops max98357a_dai_ops = {
84 .trigger = max98357a_daiops_trigger,
87 static struct snd_soc_dai_driver max98357a_dai_driver = {
90 .stream_name = "HiFi Playback",
91 .formats = SNDRV_PCM_FMTBIT_S16 |
92 SNDRV_PCM_FMTBIT_S24 |
94 .rates = SNDRV_PCM_RATE_8000 |
95 SNDRV_PCM_RATE_16000 |
96 SNDRV_PCM_RATE_48000 |
103 .ops = &max98357a_dai_ops,
106 static int max98357a_platform_probe(struct platform_device *pdev)
110 ret = snd_soc_register_codec(&pdev->dev, &max98357a_codec_driver,
111 &max98357a_dai_driver, 1);
113 dev_err(&pdev->dev, "%s() error registering codec driver: %d\n",
119 static int max98357a_platform_remove(struct platform_device *pdev)
121 snd_soc_unregister_codec(&pdev->dev);
127 static const struct of_device_id max98357a_device_id[] = {
128 { .compatible = "maxim,max98357a" },
131 MODULE_DEVICE_TABLE(of, max98357a_device_id);
134 static struct platform_driver max98357a_platform_driver = {
137 .of_match_table = of_match_ptr(max98357a_device_id),
139 .probe = max98357a_platform_probe,
140 .remove = max98357a_platform_remove,
142 module_platform_driver(max98357a_platform_driver);
144 MODULE_DESCRIPTION("Maxim MAX98357A Codec Driver");
145 MODULE_LICENSE("GPL v2");