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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/module.h> | |
16 | #include <linux/gpio.h> | |
17 | #include <sound/soc.h> | |
18 | ||
19 | #define DRV_NAME "max98357a" | |
20 | ||
21 | static int max98357a_daiops_trigger(struct snd_pcm_substream *substream, | |
22 | int cmd, struct snd_soc_dai *dai) | |
23 | { | |
24 | struct gpio_desc *sdmode = snd_soc_dai_get_drvdata(dai); | |
25 | ||
26 | switch (cmd) { | |
27 | case SNDRV_PCM_TRIGGER_START: | |
28 | case SNDRV_PCM_TRIGGER_RESUME: | |
29 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | |
30 | gpiod_set_value(sdmode, 1); | |
31 | break; | |
32 | case SNDRV_PCM_TRIGGER_STOP: | |
33 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
34 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
35 | gpiod_set_value(sdmode, 0); | |
36 | break; | |
37 | } | |
38 | ||
39 | return 0; | |
40 | } | |
41 | ||
42 | static const struct snd_soc_dapm_widget max98357a_dapm_widgets[] = { | |
43 | SND_SOC_DAPM_DAC("SDMode", NULL, SND_SOC_NOPM, 0, 0), | |
44 | SND_SOC_DAPM_OUTPUT("Speaker"), | |
45 | }; | |
46 | ||
47 | static const struct snd_soc_dapm_route max98357a_dapm_routes[] = { | |
48 | {"Speaker", NULL, "SDMode"}, | |
49 | }; | |
50 | ||
51 | static int max98357a_codec_probe(struct snd_soc_codec *codec) | |
52 | { | |
53 | struct gpio_desc *sdmode; | |
54 | ||
55 | sdmode = devm_gpiod_get(codec->dev, "sdmode"); | |
56 | if (IS_ERR(sdmode)) { | |
57 | dev_err(codec->dev, "%s() unable to get sdmode GPIO: %ld\n", | |
58 | __func__, PTR_ERR(sdmode)); | |
59 | return PTR_ERR(sdmode); | |
60 | } | |
61 | gpiod_direction_output(sdmode, 0); | |
62 | snd_soc_codec_set_drvdata(codec, sdmode); | |
63 | ||
64 | return 0; | |
65 | } | |
66 | ||
67 | static struct snd_soc_codec_driver max98357a_codec_driver = { | |
68 | .probe = max98357a_codec_probe, | |
69 | .dapm_widgets = max98357a_dapm_widgets, | |
70 | .num_dapm_widgets = ARRAY_SIZE(max98357a_dapm_widgets), | |
71 | .dapm_routes = max98357a_dapm_routes, | |
72 | .num_dapm_routes = ARRAY_SIZE(max98357a_dapm_routes), | |
73 | }; | |
74 | ||
75 | static struct snd_soc_dai_ops max98357a_dai_ops = { | |
76 | .trigger = max98357a_daiops_trigger, | |
77 | }; | |
78 | ||
79 | static struct snd_soc_dai_driver max98357a_dai_driver = { | |
80 | .name = DRV_NAME, | |
81 | .playback = { | |
82 | .stream_name = DRV_NAME "-playback", | |
83 | .formats = SNDRV_PCM_FMTBIT_S16 | | |
84 | SNDRV_PCM_FMTBIT_S24 | | |
85 | SNDRV_PCM_FMTBIT_S32, | |
86 | .rates = SNDRV_PCM_RATE_8000 | | |
87 | SNDRV_PCM_RATE_16000 | | |
88 | SNDRV_PCM_RATE_48000 | | |
89 | SNDRV_PCM_RATE_96000, | |
90 | .rate_min = 8000, | |
91 | .rate_max = 96000, | |
92 | .channels_min = 1, | |
93 | .channels_max = 2, | |
94 | }, | |
95 | .ops = &max98357a_dai_ops, | |
96 | }; | |
97 | ||
98 | static int max98357a_platform_probe(struct platform_device *pdev) | |
99 | { | |
100 | int ret; | |
101 | ||
102 | ret = snd_soc_register_codec(&pdev->dev, &max98357a_codec_driver, | |
103 | &max98357a_dai_driver, 1); | |
104 | if (ret) | |
105 | dev_err(&pdev->dev, "%s() error registering codec driver: %d\n", | |
106 | __func__, ret); | |
107 | ||
108 | return ret; | |
109 | } | |
110 | ||
111 | static int max98357a_platform_remove(struct platform_device *pdev) | |
112 | { | |
113 | snd_soc_unregister_codec(&pdev->dev); | |
114 | ||
115 | return 0; | |
116 | } | |
117 | ||
118 | #ifdef CONFIG_OF | |
119 | static const struct of_device_id max98357a_device_id[] = { | |
120 | { .compatible = "maxim," DRV_NAME, }, | |
121 | {} | |
122 | }; | |
3efa130d | 123 | MODULE_DEVICE_TABLE(of, max98357a_device_id); |
af5adf12 KW |
124 | #endif |
125 | ||
126 | static struct platform_driver max98357a_platform_driver = { | |
127 | .driver = { | |
128 | .name = DRV_NAME, | |
129 | .of_match_table = of_match_ptr(max98357a_device_id), | |
130 | }, | |
131 | .probe = max98357a_platform_probe, | |
132 | .remove = max98357a_platform_remove, | |
133 | }; | |
134 | module_platform_driver(max98357a_platform_driver); | |
135 | ||
136 | MODULE_DESCRIPTION("Maxim MAX98357A Codec Driver"); | |
137 | MODULE_LICENSE("GPL v2"); | |
138 | MODULE_ALIAS("platform:" DRV_NAME); |