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 }; 123 MODULE_DEVICE_TABLE(of, max98357a_device_id); 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); 139