tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1// SPDX-License-Identifier: GPL-2.0-only
2/* Copyright (c) 2010-2011,2013-2015 The Linux Foundation. All rights reserved.
3 *
4 * max98357a.c -- MAX98357A ALSA SoC Codec driver
5 */
6
7#include <linux/acpi.h>
8#include <linux/device.h>
9#include <linux/err.h>
10#include <linux/gpio.h>
11#include <linux/gpio/consumer.h>
12#include <linux/kernel.h>
13#include <linux/mod_devicetable.h>
14#include <linux/module.h>
15#include <linux/of.h>
16#include <linux/platform_device.h>
17#include <sound/pcm.h>
18#include <sound/soc.h>
19#include <sound/soc-dai.h>
20#include <sound/soc-dapm.h>
21
22struct max98357a_priv {
23 struct gpio_desc *sdmode;
24 unsigned int sdmode_delay;
25};
26
27static int max98357a_daiops_trigger(struct snd_pcm_substream *substream,
28 int cmd, struct snd_soc_dai *dai)
29{
30 struct max98357a_priv *max98357a = snd_soc_dai_get_drvdata(dai);
31
32 if (!max98357a->sdmode)
33 return 0;
34
35 switch (cmd) {
36 case SNDRV_PCM_TRIGGER_START:
37 case SNDRV_PCM_TRIGGER_RESUME:
38 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
39 mdelay(max98357a->sdmode_delay);
40 gpiod_set_value(max98357a->sdmode, 1);
41 break;
42 case SNDRV_PCM_TRIGGER_STOP:
43 case SNDRV_PCM_TRIGGER_SUSPEND:
44 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
45 gpiod_set_value(max98357a->sdmode, 0);
46 break;
47 }
48
49 return 0;
50}
51
52static const struct snd_soc_dapm_widget max98357a_dapm_widgets[] = {
53 SND_SOC_DAPM_OUTPUT("Speaker"),
54};
55
56static const struct snd_soc_dapm_route max98357a_dapm_routes[] = {
57 {"Speaker", NULL, "HiFi Playback"},
58};
59
60static const struct snd_soc_component_driver max98357a_component_driver = {
61 .dapm_widgets = max98357a_dapm_widgets,
62 .num_dapm_widgets = ARRAY_SIZE(max98357a_dapm_widgets),
63 .dapm_routes = max98357a_dapm_routes,
64 .num_dapm_routes = ARRAY_SIZE(max98357a_dapm_routes),
65 .idle_bias_on = 1,
66 .use_pmdown_time = 1,
67 .endianness = 1,
68 .non_legacy_dai_naming = 1,
69};
70
71static const struct snd_soc_dai_ops max98357a_dai_ops = {
72 .trigger = max98357a_daiops_trigger,
73};
74
75static struct snd_soc_dai_driver max98357a_dai_driver = {
76 .name = "HiFi",
77 .playback = {
78 .stream_name = "HiFi Playback",
79 .formats = SNDRV_PCM_FMTBIT_S16 |
80 SNDRV_PCM_FMTBIT_S24 |
81 SNDRV_PCM_FMTBIT_S32,
82 .rates = SNDRV_PCM_RATE_8000 |
83 SNDRV_PCM_RATE_16000 |
84 SNDRV_PCM_RATE_32000 |
85 SNDRV_PCM_RATE_44100 |
86 SNDRV_PCM_RATE_48000 |
87 SNDRV_PCM_RATE_88200 |
88 SNDRV_PCM_RATE_96000,
89 .rate_min = 8000,
90 .rate_max = 96000,
91 .channels_min = 1,
92 .channels_max = 2,
93 },
94 .ops = &max98357a_dai_ops,
95};
96
97static int max98357a_platform_probe(struct platform_device *pdev)
98{
99 struct max98357a_priv *max98357a;
100 int ret;
101
102 max98357a = devm_kzalloc(&pdev->dev, sizeof(*max98357a), GFP_KERNEL);
103 if (!max98357a)
104 return -ENOMEM;
105
106 max98357a->sdmode = devm_gpiod_get_optional(&pdev->dev,
107 "sdmode", GPIOD_OUT_LOW);
108 if (IS_ERR(max98357a->sdmode))
109 return PTR_ERR(max98357a->sdmode);
110
111 ret = device_property_read_u32(&pdev->dev, "sdmode-delay",
112 &max98357a->sdmode_delay);
113 if (ret) {
114 max98357a->sdmode_delay = 0;
115 dev_dbg(&pdev->dev,
116 "no optional property 'sdmode-delay' found, "
117 "default: no delay\n");
118 }
119
120 dev_set_drvdata(&pdev->dev, max98357a);
121
122 return devm_snd_soc_register_component(&pdev->dev,
123 &max98357a_component_driver,
124 &max98357a_dai_driver, 1);
125}
126
127#ifdef CONFIG_OF
128static const struct of_device_id max98357a_device_id[] = {
129 { .compatible = "maxim,max98357a" },
130 {}
131};
132MODULE_DEVICE_TABLE(of, max98357a_device_id);
133#endif
134
135#ifdef CONFIG_ACPI
136static const struct acpi_device_id max98357a_acpi_match[] = {
137 { "MX98357A", 0 },
138 {},
139};
140MODULE_DEVICE_TABLE(acpi, max98357a_acpi_match);
141#endif
142
143static struct platform_driver max98357a_platform_driver = {
144 .driver = {
145 .name = "max98357a",
146 .of_match_table = of_match_ptr(max98357a_device_id),
147 .acpi_match_table = ACPI_PTR(max98357a_acpi_match),
148 },
149 .probe = max98357a_platform_probe,
150};
151module_platform_driver(max98357a_platform_driver);
152
153MODULE_DESCRIPTION("Maxim MAX98357A Codec Driver");
154MODULE_LICENSE("GPL v2");