sound/soc/codecs/pcm3008.c

   1 /*
   2  * ALSA Soc PCM3008 codec support
   3  *
   4  * Author:      Hugo Villeneuve
   5  * Copyright (C) 2008 Lyrtech inc
   6  *
   7  * Based on AC97 Soc codec, original copyright follow:
   8  * Copyright 2005 Wolfson Microelectronics PLC.
   9  *
  10  *  This program is free software; you can redistribute  it and/or modify it
  11  *  under  the terms of  the GNU General  Public License as published by the
  12  *  Free Software Foundation;  either version 2 of the  License, or (at your
  13  *  option) any later version.
  14  *
  15  * Generic PCM3008 support.
  16  */
  17
  18 #include <linux/init.h>
  19 #include <linux/kernel.h>
  20 #include <linux/device.h>
  21 #include <linux/gpio.h>
  22 #include <linux/slab.h>
  23 #include <linux/module.h>
  24 #include <sound/core.h>
  25 #include <sound/pcm.h>
  26 #include <sound/initval.h>
  27 #include <sound/soc.h>
  28
  29 #include "pcm3008.h"
  30
  31 static int pcm3008_dac_ev(struct snd_soc_dapm_widget *w,
  32                           struct snd_kcontrol *kcontrol,
  33                           int event)
  34 {
  35         struct snd_soc_codec *codec = w->codec;
  36         struct pcm3008_setup_data *setup = codec->dev->platform_data;
  37
  38         gpio_set_value_cansleep(setup->pdda_pin,
  39                                 SND_SOC_DAPM_EVENT_ON(event));
  40
  41         return 0;
  42 }
  43
  44 static int pcm3008_adc_ev(struct snd_soc_dapm_widget *w,
  45                           struct snd_kcontrol *kcontrol,
  46                           int event)
  47 {
  48         struct snd_soc_codec *codec = w->codec;
  49         struct pcm3008_setup_data *setup = codec->dev->platform_data;
  50
  51         gpio_set_value_cansleep(setup->pdad_pin,
  52                                 SND_SOC_DAPM_EVENT_ON(event));
  53
  54         return 0;
  55 }
  56
  57 static const struct snd_soc_dapm_widget pcm3008_dapm_widgets[] = {
  58 SND_SOC_DAPM_INPUT("VINL"),
  59 SND_SOC_DAPM_INPUT("VINR"),
  60
  61 SND_SOC_DAPM_DAC_E("DAC", NULL, SND_SOC_NOPM, 0, 0, pcm3008_dac_ev,
  62                    SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
  63 SND_SOC_DAPM_ADC_E("ADC", NULL, SND_SOC_NOPM, 0, 0, pcm3008_adc_ev,
  64                    SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
  65
  66 SND_SOC_DAPM_OUTPUT("VOUTL"),
  67 SND_SOC_DAPM_OUTPUT("VOUTR"),
  68 };
  69
  70 static const struct snd_soc_dapm_route pcm3008_dapm_routes[] = {
  71         { "PCM3008 Capture", NULL, "ADC" },
  72         { "ADC", NULL, "VINL" },
  73         { "ADC", NULL, "VINR" },
  74
  75         { "DAC", NULL, "PCM3008 Playback" },
  76         { "VOUTL", NULL, "DAC" },
  77         { "VOUTR", NULL, "DAC" },
  78 };
  79
  80 #define PCM3008_RATES (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |    \
  81                        SNDRV_PCM_RATE_48000)
  82
  83 static struct snd_soc_dai_driver pcm3008_dai = {
  84         .name = "pcm3008-hifi",
  85         .playback = {
  86                 .stream_name = "PCM3008 Playback",
  87                 .channels_min = 1,
  88                 .channels_max = 2,
  89                 .rates = PCM3008_RATES,
  90                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
  91         },
  92         .capture = {
  93                 .stream_name = "PCM3008 Capture",
  94                 .channels_min = 1,
  95                 .channels_max = 2,
  96                 .rates = PCM3008_RATES,
  97                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
  98         },
  99 };
 100
 101 static struct snd_soc_codec_driver soc_codec_dev_pcm3008 = {
 102         .dapm_widgets = pcm3008_dapm_widgets,
 103         .num_dapm_widgets = ARRAY_SIZE(pcm3008_dapm_widgets),
 104         .dapm_routes = pcm3008_dapm_routes,
 105         .num_dapm_routes = ARRAY_SIZE(pcm3008_dapm_routes),
 106 };
 107
 108 static int pcm3008_codec_probe(struct platform_device *pdev)
 109 {
 110         struct pcm3008_setup_data *setup = pdev->dev.platform_data;
 111         int ret;
 112
 113         if (!setup)
 114                 return -EINVAL;
 115
 116         /* DEM1  DEM0  DE-EMPHASIS_MODE
 117          * Low   Low   De-emphasis 44.1 kHz ON
 118          * Low   High  De-emphasis OFF
 119          * High  Low   De-emphasis 48 kHz ON
 120          * High  High  De-emphasis 32 kHz ON
 121          */
 122
 123         /* Configure DEM0 GPIO (turning OFF DAC De-emphasis). */
 124         ret = devm_gpio_request_one(&pdev->dev, setup->dem0_pin,
 125                                     GPIOF_OUT_INIT_HIGH, "codec_dem0");
 126         if (ret != 0)
 127                 return ret;
 128
 129         /* Configure DEM1 GPIO (turning OFF DAC De-emphasis). */
 130         ret = devm_gpio_request_one(&pdev->dev, setup->dem1_pin,
 131                                     GPIOF_OUT_INIT_LOW, "codec_dem1");
 132         if (ret != 0)
 133                 return ret;
 134
 135         /* Configure PDAD GPIO. */
 136         ret = devm_gpio_request_one(&pdev->dev, setup->pdad_pin,
 137                                     GPIOF_OUT_INIT_LOW, "codec_pdad");
 138         if (ret != 0)
 139                 return ret;
 140
 141         /* Configure PDDA GPIO. */
 142         ret = devm_gpio_request_one(&pdev->dev, setup->pdda_pin,
 143                                     GPIOF_OUT_INIT_LOW, "codec_pdda");
 144         if (ret != 0)
 145                 return ret;
 146
 147         return snd_soc_register_codec(&pdev->dev,
 148                         &soc_codec_dev_pcm3008, &pcm3008_dai, 1);
 149 }
 150
 151 static int pcm3008_codec_remove(struct platform_device *pdev)
 152 {
 153         snd_soc_unregister_codec(&pdev->dev);
 154
 155         return 0;
 156 }
 157
 158 MODULE_ALIAS("platform:pcm3008-codec");
 159
 160 static struct platform_driver pcm3008_codec_driver = {
 161         .probe          = pcm3008_codec_probe,
 162         .remove         = pcm3008_codec_remove,
 163         .driver         = {
 164                 .name   = "pcm3008-codec",
 165                 .owner  = THIS_MODULE,
 166         },
 167 };
 168
 169 module_platform_driver(pcm3008_codec_driver);
 170
 171 MODULE_DESCRIPTION("Soc PCM3008 driver");
 172 MODULE_AUTHOR("Hugo Villeneuve");
 173 MODULE_LICENSE("GPL");