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"); 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 gpiod_direction_output(sdmode, 0); 70 snd_soc_codec_set_drvdata(codec, sdmode); 71 72 return 0; 73 } 74 75 static struct snd_soc_codec_driver max98357a_codec_driver = { 76 .probe = max98357a_codec_probe, 77 .dapm_widgets = max98357a_dapm_widgets, 78 .num_dapm_widgets = ARRAY_SIZE(max98357a_dapm_widgets), 79 .dapm_routes = max98357a_dapm_routes, 80 .num_dapm_routes = ARRAY_SIZE(max98357a_dapm_routes), 81 }; 82 83 static struct snd_soc_dai_ops max98357a_dai_ops = { 84 .trigger = max98357a_daiops_trigger, 85 }; 86 87 static struct snd_soc_dai_driver max98357a_dai_driver = { 88 .name = "HiFi", 89 .playback = { 90 .stream_name = "HiFi Playback", 91 .formats = SNDRV_PCM_FMTBIT_S16 | 92 SNDRV_PCM_FMTBIT_S24 | 93 SNDRV_PCM_FMTBIT_S32, 94 .rates = SNDRV_PCM_RATE_8000 | 95 SNDRV_PCM_RATE_16000 | 96 SNDRV_PCM_RATE_48000 | 97 SNDRV_PCM_RATE_96000, 98 .rate_min = 8000, 99 .rate_max = 96000, 100 .channels_min = 1, 101 .channels_max = 2, 102 }, 103 .ops = &max98357a_dai_ops, 104 }; 105 106 static int max98357a_platform_probe(struct platform_device *pdev) 107 { 108 int ret; 109 110 ret = snd_soc_register_codec(&pdev->dev, &max98357a_codec_driver, 111 &max98357a_dai_driver, 1); 112 if (ret) 113 dev_err(&pdev->dev, "%s() error registering codec driver: %d\n", 114 __func__, ret); 115 116 return ret; 117 } 118 119 static int max98357a_platform_remove(struct platform_device *pdev) 120 { 121 snd_soc_unregister_codec(&pdev->dev); 122 123 return 0; 124 } 125 126 #ifdef CONFIG_OF 127 static const struct of_device_id max98357a_device_id[] = { 128 { .compatible = "maxim,max98357a" }, 129 {} 130 }; 131 MODULE_DEVICE_TABLE(of, max98357a_device_id); 132 #endif 133 134 static struct platform_driver max98357a_platform_driver = { 135 .driver = { 136 .name = "max98357a", 137 .of_match_table = of_match_ptr(max98357a_device_id), 138 }, 139 .probe = max98357a_platform_probe, 140 .remove = max98357a_platform_remove, 141 }; 142 module_platform_driver(max98357a_platform_driver); 143 144 MODULE_DESCRIPTION("Maxim MAX98357A Codec Driver"); 145 MODULE_LICENSE("GPL v2"); 146