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/device.h> 16 #include <linux/err.h> 17 #include <linux/gpio.h> 18 #include <linux/gpio/consumer.h> 19 #include <linux/kernel.h> 20 #include <linux/mod_devicetable.h> 21 #include <linux/module.h> 22 #include <linux/of.h> 23 #include <linux/platform_device.h> 24 #include <sound/pcm.h> 25 #include <sound/soc.h> 26 #include <sound/soc-dai.h> 27 #include <sound/soc-dapm.h> 28 29 #define DRV_NAME "max98357a" 30 31 static int max98357a_daiops_trigger(struct snd_pcm_substream *substream, 32 int cmd, struct snd_soc_dai *dai) 33 { 34 struct gpio_desc *sdmode = snd_soc_dai_get_drvdata(dai); 35 36 switch (cmd) { 37 case SNDRV_PCM_TRIGGER_START: 38 case SNDRV_PCM_TRIGGER_RESUME: 39 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 40 gpiod_set_value(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(sdmode, 0); 46 break; 47 } 48 49 return 0; 50 } 51 52 static const struct snd_soc_dapm_widget max98357a_dapm_widgets[] = { 53 SND_SOC_DAPM_DAC("SDMode", NULL, SND_SOC_NOPM, 0, 0), 54 SND_SOC_DAPM_OUTPUT("Speaker"), 55 }; 56 57 static const struct snd_soc_dapm_route max98357a_dapm_routes[] = { 58 {"Speaker", NULL, "SDMode"}, 59 }; 60 61 static int max98357a_codec_probe(struct snd_soc_codec *codec) 62 { 63 struct gpio_desc *sdmode; 64 65 sdmode = devm_gpiod_get(codec->dev, "sdmode"); 66 if (IS_ERR(sdmode)) { 67 dev_err(codec->dev, "%s() unable to get sdmode GPIO: %ld\n", 68 __func__, PTR_ERR(sdmode)); 69 return PTR_ERR(sdmode); 70 } 71 gpiod_direction_output(sdmode, 0); 72 snd_soc_codec_set_drvdata(codec, sdmode); 73 74 return 0; 75 } 76 77 static struct snd_soc_codec_driver max98357a_codec_driver = { 78 .probe = max98357a_codec_probe, 79 .dapm_widgets = max98357a_dapm_widgets, 80 .num_dapm_widgets = ARRAY_SIZE(max98357a_dapm_widgets), 81 .dapm_routes = max98357a_dapm_routes, 82 .num_dapm_routes = ARRAY_SIZE(max98357a_dapm_routes), 83 }; 84 85 static struct snd_soc_dai_ops max98357a_dai_ops = { 86 .trigger = max98357a_daiops_trigger, 87 }; 88 89 static struct snd_soc_dai_driver max98357a_dai_driver = { 90 .name = DRV_NAME, 91 .playback = { 92 .stream_name = DRV_NAME "-playback", 93 .formats = SNDRV_PCM_FMTBIT_S16 | 94 SNDRV_PCM_FMTBIT_S24 | 95 SNDRV_PCM_FMTBIT_S32, 96 .rates = SNDRV_PCM_RATE_8000 | 97 SNDRV_PCM_RATE_16000 | 98 SNDRV_PCM_RATE_48000 | 99 SNDRV_PCM_RATE_96000, 100 .rate_min = 8000, 101 .rate_max = 96000, 102 .channels_min = 1, 103 .channels_max = 2, 104 }, 105 .ops = &max98357a_dai_ops, 106 }; 107 108 static int max98357a_platform_probe(struct platform_device *pdev) 109 { 110 int ret; 111 112 ret = snd_soc_register_codec(&pdev->dev, &max98357a_codec_driver, 113 &max98357a_dai_driver, 1); 114 if (ret) 115 dev_err(&pdev->dev, "%s() error registering codec driver: %d\n", 116 __func__, ret); 117 118 return ret; 119 } 120 121 static int max98357a_platform_remove(struct platform_device *pdev) 122 { 123 snd_soc_unregister_codec(&pdev->dev); 124 125 return 0; 126 } 127 128 #ifdef CONFIG_OF 129 static const struct of_device_id max98357a_device_id[] = { 130 { .compatible = "maxim," DRV_NAME, }, 131 {} 132 }; 133 MODULE_DEVICE_TABLE(of, max98357a_device_id); 134 #endif 135 136 static struct platform_driver max98357a_platform_driver = { 137 .driver = { 138 .name = DRV_NAME, 139 .of_match_table = of_match_ptr(max98357a_device_id), 140 }, 141 .probe = max98357a_platform_probe, 142 .remove = max98357a_platform_remove, 143 }; 144 module_platform_driver(max98357a_platform_driver); 145 146 MODULE_DESCRIPTION("Maxim MAX98357A Codec Driver"); 147 MODULE_LICENSE("GPL v2"); 148 MODULE_ALIAS("platform:" DRV_NAME); 149