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/acpi.h>
16 #include <linux/device.h>
17 #include <linux/err.h>
18 #include <linux/gpio.h>
19 #include <linux/gpio/consumer.h>
20 #include <linux/kernel.h>
21 #include <linux/mod_devicetable.h>
22 #include <linux/module.h>
23 #include <linux/of.h>
24 #include <linux/platform_device.h>
25 #include <sound/pcm.h>
26 #include <sound/soc.h>
27 #include <sound/soc-dai.h>
28 #include <sound/soc-dapm.h>
29
max98357a_daiops_trigger(struct snd_pcm_substream * substream,int cmd,struct snd_soc_dai * dai)30 static int max98357a_daiops_trigger(struct snd_pcm_substream *substream,
31 int cmd, struct snd_soc_dai *dai)
32 {
33 struct gpio_desc *sdmode = snd_soc_dai_get_drvdata(dai);
34
35 if (!sdmode)
36 return 0;
37
38 switch (cmd) {
39 case SNDRV_PCM_TRIGGER_START:
40 case SNDRV_PCM_TRIGGER_RESUME:
41 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
42 gpiod_set_value(sdmode, 1);
43 break;
44 case SNDRV_PCM_TRIGGER_STOP:
45 case SNDRV_PCM_TRIGGER_SUSPEND:
46 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
47 gpiod_set_value(sdmode, 0);
48 break;
49 }
50
51 return 0;
52 }
53
54 static const struct snd_soc_dapm_widget max98357a_dapm_widgets[] = {
55 SND_SOC_DAPM_OUTPUT("Speaker"),
56 };
57
58 static const struct snd_soc_dapm_route max98357a_dapm_routes[] = {
59 {"Speaker", NULL, "HiFi Playback"},
60 };
61
max98357a_component_probe(struct snd_soc_component * component)62 static int max98357a_component_probe(struct snd_soc_component *component)
63 {
64 struct gpio_desc *sdmode;
65
66 sdmode = devm_gpiod_get_optional(component->dev, "sdmode", GPIOD_OUT_LOW);
67 if (IS_ERR(sdmode))
68 return PTR_ERR(sdmode);
69
70 snd_soc_component_set_drvdata(component, sdmode);
71
72 return 0;
73 }
74
75 static const struct snd_soc_component_driver max98357a_component_driver = {
76 .probe = max98357a_component_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 .idle_bias_on = 1,
82 .use_pmdown_time = 1,
83 .endianness = 1,
84 .non_legacy_dai_naming = 1,
85 };
86
87 static const struct snd_soc_dai_ops max98357a_dai_ops = {
88 .trigger = max98357a_daiops_trigger,
89 };
90
91 static struct snd_soc_dai_driver max98357a_dai_driver = {
92 .name = "HiFi",
93 .playback = {
94 .stream_name = "HiFi Playback",
95 .formats = SNDRV_PCM_FMTBIT_S16 |
96 SNDRV_PCM_FMTBIT_S24 |
97 SNDRV_PCM_FMTBIT_S32,
98 .rates = SNDRV_PCM_RATE_8000 |
99 SNDRV_PCM_RATE_16000 |
100 SNDRV_PCM_RATE_48000 |
101 SNDRV_PCM_RATE_96000,
102 .rate_min = 8000,
103 .rate_max = 96000,
104 .channels_min = 1,
105 .channels_max = 2,
106 },
107 .ops = &max98357a_dai_ops,
108 };
109
max98357a_platform_probe(struct platform_device * pdev)110 static int max98357a_platform_probe(struct platform_device *pdev)
111 {
112 return devm_snd_soc_register_component(&pdev->dev,
113 &max98357a_component_driver,
114 &max98357a_dai_driver, 1);
115 }
116
max98357a_platform_remove(struct platform_device * pdev)117 static int max98357a_platform_remove(struct platform_device *pdev)
118 {
119 return 0;
120 }
121
122 #ifdef CONFIG_OF
123 static const struct of_device_id max98357a_device_id[] = {
124 { .compatible = "maxim,max98357a" },
125 {}
126 };
127 MODULE_DEVICE_TABLE(of, max98357a_device_id);
128 #endif
129
130 #ifdef CONFIG_ACPI
131 static const struct acpi_device_id max98357a_acpi_match[] = {
132 { "MX98357A", 0 },
133 {},
134 };
135 MODULE_DEVICE_TABLE(acpi, max98357a_acpi_match);
136 #endif
137
138 static struct platform_driver max98357a_platform_driver = {
139 .driver = {
140 .name = "max98357a",
141 .of_match_table = of_match_ptr(max98357a_device_id),
142 .acpi_match_table = ACPI_PTR(max98357a_acpi_match),
143 },
144 .probe = max98357a_platform_probe,
145 .remove = max98357a_platform_remove,
146 };
147 module_platform_driver(max98357a_platform_driver);
148
149 MODULE_DESCRIPTION("Maxim MAX98357A Codec Driver");
150 MODULE_LICENSE("GPL v2");
151
