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/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
22 struct max98357a_priv {
23 struct gpio_desc *sdmode;
24 unsigned int sdmode_delay;
25 int sdmode_switch;
26 };
27
28 static int max98357a_daiops_trigger(struct snd_pcm_substream *substream,
29 int cmd, struct snd_soc_dai *dai)
30 {
31 struct snd_soc_component *component = dai->component;
32 struct max98357a_priv *max98357a =
33 snd_soc_component_get_drvdata(component);
34
35 if (!max98357a->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 mdelay(max98357a->sdmode_delay);
43 if (max98357a->sdmode_switch) {
44 gpiod_set_value(max98357a->sdmode, 1);
45 dev_dbg(component->dev, "set sdmode to 1");
46 }
47 break;
48 case SNDRV_PCM_TRIGGER_STOP:
49 case SNDRV_PCM_TRIGGER_SUSPEND:
50 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
51 gpiod_set_value(max98357a->sdmode, 0);
52 dev_dbg(component->dev, "set sdmode to 0");
53 break;
54 }
55
56 return 0;
57 }
58
59 static int max98357a_sdmode_event(struct snd_soc_dapm_widget *w,
60 struct snd_kcontrol *kcontrol, int event)
61 {
62 struct snd_soc_component *component =
63 snd_soc_dapm_to_component(w->dapm);
64 struct max98357a_priv *max98357a =
65 snd_soc_component_get_drvdata(component);
66
67 if (event & SND_SOC_DAPM_POST_PMU)
68 max98357a->sdmode_switch = 1;
69 else if (event & SND_SOC_DAPM_POST_PMD)
70 max98357a->sdmode_switch = 0;
71
72 return 0;
73 }
74
75 static const struct snd_soc_dapm_widget max98357a_dapm_widgets[] = {
76 SND_SOC_DAPM_OUTPUT("Speaker"),
77 SND_SOC_DAPM_OUT_DRV_E("SD_MODE", SND_SOC_NOPM, 0, 0, NULL, 0,
78 max98357a_sdmode_event,
79 SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD),
80 };
81
82 static const struct snd_soc_dapm_route max98357a_dapm_routes[] = {
83 {"SD_MODE", NULL, "HiFi Playback"},
84 {"Speaker", NULL, "SD_MODE"},
85 };
86
87 static const struct snd_soc_component_driver max98357a_component_driver = {
88 .dapm_widgets = max98357a_dapm_widgets,
89 .num_dapm_widgets = ARRAY_SIZE(max98357a_dapm_widgets),
90 .dapm_routes = max98357a_dapm_routes,
91 .num_dapm_routes = ARRAY_SIZE(max98357a_dapm_routes),
92 .idle_bias_on = 1,
93 .use_pmdown_time = 1,
94 .endianness = 1,
95 };
96
97 static const struct snd_soc_dai_ops max98357a_dai_ops = {
98 .trigger = max98357a_daiops_trigger,
99 };
100
101 static struct snd_soc_dai_driver max98357a_dai_driver = {
102 .name = "HiFi",
103 .playback = {
104 .stream_name = "HiFi Playback",
105 .formats = SNDRV_PCM_FMTBIT_S16 |
106 SNDRV_PCM_FMTBIT_S24 |
107 SNDRV_PCM_FMTBIT_S32,
108 .rates = SNDRV_PCM_RATE_8000 |
109 SNDRV_PCM_RATE_16000 |
110 SNDRV_PCM_RATE_32000 |
111 SNDRV_PCM_RATE_44100 |
112 SNDRV_PCM_RATE_48000 |
113 SNDRV_PCM_RATE_88200 |
114 SNDRV_PCM_RATE_96000,
115 .rate_min = 8000,
116 .rate_max = 96000,
117 .channels_min = 1,
118 .channels_max = 2,
119 },
120 .ops = &max98357a_dai_ops,
121 };
122
123 static int max98357a_platform_probe(struct platform_device *pdev)
124 {
125 struct max98357a_priv *max98357a;
126 int ret;
127
128 max98357a = devm_kzalloc(&pdev->dev, sizeof(*max98357a), GFP_KERNEL);
129 if (!max98357a)
130 return -ENOMEM;
131
132 max98357a->sdmode = devm_gpiod_get_optional(&pdev->dev,
133 "sdmode", GPIOD_OUT_LOW);
134 if (IS_ERR(max98357a->sdmode))
135 return PTR_ERR(max98357a->sdmode);
136
137 ret = device_property_read_u32(&pdev->dev, "sdmode-delay",
138 &max98357a->sdmode_delay);
139 if (ret) {
140 max98357a->sdmode_delay = 0;
141 dev_dbg(&pdev->dev,
142 "no optional property 'sdmode-delay' found, "
143 "default: no delay\n");
144 }
145
146 dev_set_drvdata(&pdev->dev, max98357a);
147
148 return devm_snd_soc_register_component(&pdev->dev,
149 &max98357a_component_driver,
150 &max98357a_dai_driver, 1);
151 }
152
153 #ifdef CONFIG_OF
154 static const struct of_device_id max98357a_device_id[] = {
155 { .compatible = "maxim,max98357a" },
156 { .compatible = "maxim,max98360a" },
157 {}
158 };
159 MODULE_DEVICE_TABLE(of, max98357a_device_id);
160 #endif
161
162 #ifdef CONFIG_ACPI
163 static const struct acpi_device_id max98357a_acpi_match[] = {
164 { "MX98357A", 0 },
165 { "MX98360A", 0 },
166 {},
167 };
168 MODULE_DEVICE_TABLE(acpi, max98357a_acpi_match);
169 #endif
170
171 static struct platform_driver max98357a_platform_driver = {
172 .driver = {
173 .name = "max98357a",
174 .of_match_table = of_match_ptr(max98357a_device_id),
175 .acpi_match_table = ACPI_PTR(max98357a_acpi_match),
176 },
177 .probe = max98357a_platform_probe,
178 };
179 module_platform_driver(max98357a_platform_driver);
180
181 MODULE_DESCRIPTION("Maxim MAX98357A Codec Driver");
182 MODULE_LICENSE("GPL v2");
183
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