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/delay.h>
9 #include <linux/device.h>
10 #include <linux/err.h>
11 #include <linux/gpio/consumer.h>
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/of.h>
15 #include <linux/platform_device.h>
16 #include <sound/pcm.h>
17 #include <sound/soc.h>
18 #include <sound/soc-dai.h>
19 #include <sound/soc-dapm.h>
20
21 struct max98357a_priv {
22 struct gpio_desc *sdmode;
23 unsigned int sdmode_delay;
24 int sdmode_switch;
25 };
26
max98357a_daiops_trigger(struct snd_pcm_substream * substream,int cmd,struct snd_soc_dai * dai)27 static int max98357a_daiops_trigger(struct snd_pcm_substream *substream,
28 int cmd, struct snd_soc_dai *dai)
29 {
30 struct snd_soc_component *component = dai->component;
31 struct max98357a_priv *max98357a =
32 snd_soc_component_get_drvdata(component);
33
34 if (!max98357a->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 mdelay(max98357a->sdmode_delay);
42 if (max98357a->sdmode_switch) {
43 gpiod_set_value(max98357a->sdmode, 1);
44 dev_dbg(component->dev, "set sdmode to 1");
45 }
46 break;
47 case SNDRV_PCM_TRIGGER_STOP:
48 case SNDRV_PCM_TRIGGER_SUSPEND:
49 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
50 gpiod_set_value(max98357a->sdmode, 0);
51 dev_dbg(component->dev, "set sdmode to 0");
52 break;
53 }
54
55 return 0;
56 }
57
max98357a_sdmode_event(struct snd_soc_dapm_widget * w,struct snd_kcontrol * kcontrol,int event)58 static int max98357a_sdmode_event(struct snd_soc_dapm_widget *w,
59 struct snd_kcontrol *kcontrol, int event)
60 {
61 struct snd_soc_component *component =
62 snd_soc_dapm_to_component(w->dapm);
63 struct max98357a_priv *max98357a =
64 snd_soc_component_get_drvdata(component);
65
66 if (event & SND_SOC_DAPM_POST_PMU)
67 max98357a->sdmode_switch = 1;
68 else if (event & SND_SOC_DAPM_POST_PMD)
69 max98357a->sdmode_switch = 0;
70
71 return 0;
72 }
73
74 static const struct snd_soc_dapm_widget max98357a_dapm_widgets[] = {
75 SND_SOC_DAPM_OUTPUT("Speaker"),
76 SND_SOC_DAPM_OUT_DRV_E("SD_MODE", SND_SOC_NOPM, 0, 0, NULL, 0,
77 max98357a_sdmode_event,
78 SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD),
79 };
80
81 static const struct snd_soc_dapm_route max98357a_dapm_routes[] = {
82 {"SD_MODE", NULL, "HiFi Playback"},
83 {"Speaker", NULL, "SD_MODE"},
84 };
85
86 static const struct snd_soc_component_driver max98357a_component_driver = {
87 .dapm_widgets = max98357a_dapm_widgets,
88 .num_dapm_widgets = ARRAY_SIZE(max98357a_dapm_widgets),
89 .dapm_routes = max98357a_dapm_routes,
90 .num_dapm_routes = ARRAY_SIZE(max98357a_dapm_routes),
91 .idle_bias_on = 1,
92 .use_pmdown_time = 1,
93 .endianness = 1,
94 };
95
96 static const struct snd_soc_dai_ops max98357a_dai_ops = {
97 .trigger = max98357a_daiops_trigger,
98 };
99
100 static struct snd_soc_dai_driver max98357a_dai_driver = {
101 .name = "HiFi",
102 .playback = {
103 .stream_name = "HiFi Playback",
104 .formats = SNDRV_PCM_FMTBIT_S16 |
105 SNDRV_PCM_FMTBIT_S24 |
106 SNDRV_PCM_FMTBIT_S32,
107 .rates = SNDRV_PCM_RATE_8000 |
108 SNDRV_PCM_RATE_16000 |
109 SNDRV_PCM_RATE_32000 |
110 SNDRV_PCM_RATE_44100 |
111 SNDRV_PCM_RATE_48000 |
112 SNDRV_PCM_RATE_88200 |
113 SNDRV_PCM_RATE_96000,
114 .rate_min = 8000,
115 .rate_max = 96000,
116 .channels_min = 1,
117 .channels_max = 2,
118 },
119 .ops = &max98357a_dai_ops,
120 };
121
max98357a_platform_probe(struct platform_device * pdev)122 static int max98357a_platform_probe(struct platform_device *pdev)
123 {
124 struct max98357a_priv *max98357a;
125 int ret;
126
127 max98357a = devm_kzalloc(&pdev->dev, sizeof(*max98357a), GFP_KERNEL);
128 if (!max98357a)
129 return -ENOMEM;
130
131 max98357a->sdmode = devm_gpiod_get_optional(&pdev->dev,
132 "sdmode", GPIOD_OUT_LOW);
133 if (IS_ERR(max98357a->sdmode))
134 return PTR_ERR(max98357a->sdmode);
135
136 ret = device_property_read_u32(&pdev->dev, "sdmode-delay",
137 &max98357a->sdmode_delay);
138 if (ret) {
139 max98357a->sdmode_delay = 0;
140 dev_dbg(&pdev->dev,
141 "no optional property 'sdmode-delay' found, "
142 "default: no delay\n");
143 }
144
145 dev_set_drvdata(&pdev->dev, max98357a);
146
147 return devm_snd_soc_register_component(&pdev->dev,
148 &max98357a_component_driver,
149 &max98357a_dai_driver, 1);
150 }
151
152 #ifdef CONFIG_OF
153 static const struct of_device_id max98357a_device_id[] = {
154 { .compatible = "maxim,max98357a" },
155 { .compatible = "maxim,max98360a" },
156 {}
157 };
158 MODULE_DEVICE_TABLE(of, max98357a_device_id);
159 #endif
160
161 #ifdef CONFIG_ACPI
162 static const struct acpi_device_id max98357a_acpi_match[] = {
163 { "MX98357A", 0 },
164 { "MX98360A", 0 },
165 {},
166 };
167 MODULE_DEVICE_TABLE(acpi, max98357a_acpi_match);
168 #endif
169
170 static struct platform_driver max98357a_platform_driver = {
171 .driver = {
172 .name = "max98357a",
173 .of_match_table = of_match_ptr(max98357a_device_id),
174 .acpi_match_table = ACPI_PTR(max98357a_acpi_match),
175 },
176 .probe = max98357a_platform_probe,
177 };
178 module_platform_driver(max98357a_platform_driver);
179
180 MODULE_DESCRIPTION("Maxim MAX98357A Codec Driver");
181 MODULE_LICENSE("GPL v2");
182