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 #define PCM3008_VERSION "0.2"
  32
  33 #define PCM3008_RATES (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |    \
  34                        SNDRV_PCM_RATE_48000)
  35
  36 static struct snd_soc_dai_driver pcm3008_dai = {
  37         .name = "pcm3008-hifi",
  38         .playback = {
  39                 .stream_name = "PCM3008 Playback",
  40                 .channels_min = 1,
  41                 .channels_max = 2,
  42                 .rates = PCM3008_RATES,
  43                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
  44         },
  45         .capture = {
  46                 .stream_name = "PCM3008 Capture",
  47                 .channels_min = 1,
  48                 .channels_max = 2,
  49                 .rates = PCM3008_RATES,
  50                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
  51         },
  52 };
  53
  54 static void pcm3008_gpio_free(struct pcm3008_setup_data *setup)
  55 {
  56         gpio_free(setup->dem0_pin);
  57         gpio_free(setup->dem1_pin);
  58         gpio_free(setup->pdad_pin);
  59         gpio_free(setup->pdda_pin);
  60 }
  61
  62 static int pcm3008_soc_probe(struct snd_soc_codec *codec)
  63 {
  64         struct pcm3008_setup_data *setup = codec->dev->platform_data;
  65         int ret = 0;
  66
  67         printk(KERN_INFO "PCM3008 SoC Audio Codec %s\n", PCM3008_VERSION);
  68
  69         /* DEM1  DEM0  DE-EMPHASIS_MODE
  70          * Low   Low   De-emphasis 44.1 kHz ON
  71          * Low   High  De-emphasis OFF
  72          * High  Low   De-emphasis 48 kHz ON
  73          * High  High  De-emphasis 32 kHz ON
  74          */
  75
  76         /* Configure DEM0 GPIO (turning OFF DAC De-emphasis). */
  77         ret = gpio_request(setup->dem0_pin, "codec_dem0");
  78         if (ret == 0)
  79                 ret = gpio_direction_output(setup->dem0_pin, 1);
  80         if (ret != 0)
  81                 goto gpio_err;
  82
  83         /* Configure DEM1 GPIO (turning OFF DAC De-emphasis). */
  84         ret = gpio_request(setup->dem1_pin, "codec_dem1");
  85         if (ret == 0)
  86                 ret = gpio_direction_output(setup->dem1_pin, 0);
  87         if (ret != 0)
  88                 goto gpio_err;
  89
  90         /* Configure PDAD GPIO. */
  91         ret = gpio_request(setup->pdad_pin, "codec_pdad");
  92         if (ret == 0)
  93                 ret = gpio_direction_output(setup->pdad_pin, 1);
  94         if (ret != 0)
  95                 goto gpio_err;
  96
  97         /* Configure PDDA GPIO. */
  98         ret = gpio_request(setup->pdda_pin, "codec_pdda");
  99         if (ret == 0)
 100                 ret = gpio_direction_output(setup->pdda_pin, 1);
 101         if (ret != 0)
 102                 goto gpio_err;
 103
 104         return ret;
 105
 106 gpio_err:
 107         pcm3008_gpio_free(setup);
 108
 109         return ret;
 110 }
 111
 112 static int pcm3008_soc_remove(struct snd_soc_codec *codec)
 113 {
 114         struct pcm3008_setup_data *setup = codec->dev->platform_data;
 115
 116         pcm3008_gpio_free(setup);
 117         return 0;
 118 }
 119
 120 #ifdef CONFIG_PM
 121 static int pcm3008_soc_suspend(struct snd_soc_codec *codec)
 122 {
 123         struct pcm3008_setup_data *setup = codec->dev->platform_data;
 124
 125         gpio_set_value(setup->pdad_pin, 0);
 126         gpio_set_value(setup->pdda_pin, 0);
 127
 128         return 0;
 129 }
 130
 131 static int pcm3008_soc_resume(struct snd_soc_codec *codec)
 132 {
 133         struct pcm3008_setup_data *setup = codec->dev->platform_data;
 134
 135         gpio_set_value(setup->pdad_pin, 1);
 136         gpio_set_value(setup->pdda_pin, 1);
 137
 138         return 0;
 139 }
 140 #else
 141 #define pcm3008_soc_suspend NULL
 142 #define pcm3008_soc_resume NULL
 143 #endif
 144
 145 static struct snd_soc_codec_driver soc_codec_dev_pcm3008 = {
 146         .probe =        pcm3008_soc_probe,
 147         .remove =       pcm3008_soc_remove,
 148         .suspend =      pcm3008_soc_suspend,
 149         .resume =       pcm3008_soc_resume,
 150 };
 151
 152 static int pcm3008_codec_probe(struct platform_device *pdev)
 153 {
 154         return snd_soc_register_codec(&pdev->dev,
 155                         &soc_codec_dev_pcm3008, &pcm3008_dai, 1);
 156 }
 157
 158 static int pcm3008_codec_remove(struct platform_device *pdev)
 159 {
 160         snd_soc_unregister_codec(&pdev->dev);
 161         return 0;
 162 }
 163
 164 MODULE_ALIAS("platform:pcm3008-codec");
 165
 166 static struct platform_driver pcm3008_codec_driver = {
 167         .probe          = pcm3008_codec_probe,
 168         .remove         = pcm3008_codec_remove,
 169         .driver         = {
 170                 .name   = "pcm3008-codec",
 171                 .owner  = THIS_MODULE,
 172         },
 173 };
 174
 175 module_platform_driver(pcm3008_codec_driver);
 176
 177 MODULE_DESCRIPTION("Soc PCM3008 driver");
 178 MODULE_AUTHOR("Hugo Villeneuve");
 179 MODULE_LICENSE("GPL");