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/acpi.h> 16 #include <linux/device.h> 17 #include <linux/err.h> 18 #include <linux/gpio.h> 19 #include <linux/gpio/consumer.h> 20 #include <linux/kernel.h> 21 #include <linux/mod_devicetable.h> 22 #include <linux/module.h> 23 #include <linux/of.h> 24 #include <linux/platform_device.h> 25 #include <sound/pcm.h> 26 #include <sound/soc.h> 27 #include <sound/soc-dai.h> 28 #include <sound/soc-dapm.h> 29 30 static int max98357a_daiops_trigger(struct snd_pcm_substream *substream, 31 int cmd, struct snd_soc_dai *dai) 32 { 33 struct gpio_desc *sdmode = snd_soc_dai_get_drvdata(dai); 34 35 if (!sdmode) 36 return 0; 37 38 switch (cmd) { 39 case SNDRV_PCM_TRIGGER_START: 40 case SNDRV_PCM_TRIGGER_RESUME: 41 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 42 gpiod_set_value(sdmode, 1); 43 break; 44 case SNDRV_PCM_TRIGGER_STOP: 45 case SNDRV_PCM_TRIGGER_SUSPEND: 46 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 47 gpiod_set_value(sdmode, 0); 48 break; 49 } 50 51 return 0; 52 } 53 54 static const struct snd_soc_dapm_widget max98357a_dapm_widgets[] = { 55 SND_SOC_DAPM_OUTPUT("Speaker"), 56 }; 57 58 static const struct snd_soc_dapm_route max98357a_dapm_routes[] = { 59 {"Speaker", NULL, "HiFi Playback"}, 60 }; 61 62 static int max98357a_codec_probe(struct snd_soc_codec *codec) 63 { 64 struct gpio_desc *sdmode; 65 66 sdmode = devm_gpiod_get_optional(codec->dev, "sdmode", GPIOD_OUT_LOW); 67 if (IS_ERR(sdmode)) 68 return PTR_ERR(sdmode); 69 70 snd_soc_codec_set_drvdata(codec, sdmode); 71 72 return 0; 73 } 74 75 static const struct snd_soc_codec_driver max98357a_codec_driver = { 76 .probe = max98357a_codec_probe, 77 .component_driver = { 78 .dapm_widgets = max98357a_dapm_widgets, 79 .num_dapm_widgets = ARRAY_SIZE(max98357a_dapm_widgets), 80 .dapm_routes = max98357a_dapm_routes, 81 .num_dapm_routes = ARRAY_SIZE(max98357a_dapm_routes), 82 }, 83 }; 84 85 static const 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 = "HiFi", 91 .playback = { 92 .stream_name = "HiFi 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 return snd_soc_register_codec(&pdev->dev, &max98357a_codec_driver, 111 &max98357a_dai_driver, 1); 112 } 113 114 static int max98357a_platform_remove(struct platform_device *pdev) 115 { 116 snd_soc_unregister_codec(&pdev->dev); 117 118 return 0; 119 } 120 121 #ifdef CONFIG_OF 122 static const struct of_device_id max98357a_device_id[] = { 123 { .compatible = "maxim,max98357a" }, 124 {} 125 }; 126 MODULE_DEVICE_TABLE(of, max98357a_device_id); 127 #endif 128 129 #ifdef CONFIG_ACPI 130 static const struct acpi_device_id max98357a_acpi_match[] = { 131 { "MX98357A", 0 }, 132 {}, 133 }; 134 MODULE_DEVICE_TABLE(acpi, max98357a_acpi_match); 135 #endif 136 137 static struct platform_driver max98357a_platform_driver = { 138 .driver = { 139 .name = "max98357a", 140 .of_match_table = of_match_ptr(max98357a_device_id), 141 .acpi_match_table = ACPI_PTR(max98357a_acpi_match), 142 }, 143 .probe = max98357a_platform_probe, 144 .remove = max98357a_platform_remove, 145 }; 146 module_platform_driver(max98357a_platform_driver); 147 148 MODULE_DESCRIPTION("Maxim MAX98357A Codec Driver"); 149 MODULE_LICENSE("GPL v2"); 150