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 static int max98357a_daiops_trigger(struct snd_pcm_substream *substream, 30 int cmd, struct snd_soc_dai *dai) 31 { 32 struct gpio_desc *sdmode = snd_soc_dai_get_drvdata(dai); 33 34 switch (cmd) { 35 case SNDRV_PCM_TRIGGER_START: 36 case SNDRV_PCM_TRIGGER_RESUME: 37 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 38 gpiod_set_value(sdmode, 1); 39 break; 40 case SNDRV_PCM_TRIGGER_STOP: 41 case SNDRV_PCM_TRIGGER_SUSPEND: 42 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 43 gpiod_set_value(sdmode, 0); 44 break; 45 } 46 47 return 0; 48 } 49 50 static const struct snd_soc_dapm_widget max98357a_dapm_widgets[] = { 51 SND_SOC_DAPM_DAC("SDMode", NULL, SND_SOC_NOPM, 0, 0), 52 SND_SOC_DAPM_OUTPUT("Speaker"), 53 }; 54 55 static const struct snd_soc_dapm_route max98357a_dapm_routes[] = { 56 {"Speaker", NULL, "SDMode"}, 57 }; 58 59 static int max98357a_codec_probe(struct snd_soc_codec *codec) 60 { 61 struct gpio_desc *sdmode; 62 63 sdmode = devm_gpiod_get(codec->dev, "sdmode", GPIOD_OUT_LOW); 64 if (IS_ERR(sdmode)) { 65 dev_err(codec->dev, "%s() unable to get sdmode GPIO: %ld\n", 66 __func__, PTR_ERR(sdmode)); 67 return PTR_ERR(sdmode); 68 } 69 snd_soc_codec_set_drvdata(codec, sdmode); 70 71 return 0; 72 } 73 74 static struct snd_soc_codec_driver max98357a_codec_driver = { 75 .probe = max98357a_codec_probe, 76 .dapm_widgets = max98357a_dapm_widgets, 77 .num_dapm_widgets = ARRAY_SIZE(max98357a_dapm_widgets), 78 .dapm_routes = max98357a_dapm_routes, 79 .num_dapm_routes = ARRAY_SIZE(max98357a_dapm_routes), 80 }; 81 82 static struct snd_soc_dai_ops max98357a_dai_ops = { 83 .trigger = max98357a_daiops_trigger, 84 }; 85 86 static struct snd_soc_dai_driver max98357a_dai_driver = { 87 .name = "HiFi", 88 .playback = { 89 .stream_name = "HiFi Playback", 90 .formats = SNDRV_PCM_FMTBIT_S16 | 91 SNDRV_PCM_FMTBIT_S24 | 92 SNDRV_PCM_FMTBIT_S32, 93 .rates = SNDRV_PCM_RATE_8000 | 94 SNDRV_PCM_RATE_16000 | 95 SNDRV_PCM_RATE_48000 | 96 SNDRV_PCM_RATE_96000, 97 .rate_min = 8000, 98 .rate_max = 96000, 99 .channels_min = 1, 100 .channels_max = 2, 101 }, 102 .ops = &max98357a_dai_ops, 103 }; 104 105 static int max98357a_platform_probe(struct platform_device *pdev) 106 { 107 int ret; 108 109 ret = snd_soc_register_codec(&pdev->dev, &max98357a_codec_driver, 110 &max98357a_dai_driver, 1); 111 if (ret) 112 dev_err(&pdev->dev, "%s() error registering codec driver: %d\n", 113 __func__, ret); 114 115 return ret; 116 } 117 118 static int max98357a_platform_remove(struct platform_device *pdev) 119 { 120 snd_soc_unregister_codec(&pdev->dev); 121 122 return 0; 123 } 124 125 #ifdef CONFIG_OF 126 static const struct of_device_id max98357a_device_id[] = { 127 { .compatible = "maxim,max98357a" }, 128 {} 129 }; 130 MODULE_DEVICE_TABLE(of, max98357a_device_id); 131 #endif 132 133 static struct platform_driver max98357a_platform_driver = { 134 .driver = { 135 .name = "max98357a", 136 .of_match_table = of_match_ptr(max98357a_device_id), 137 }, 138 .probe = max98357a_platform_probe, 139 .remove = max98357a_platform_remove, 140 }; 141 module_platform_driver(max98357a_platform_driver); 142 143 MODULE_DESCRIPTION("Maxim MAX98357A Codec Driver"); 144 MODULE_LICENSE("GPL v2"); 145