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 <sound/core.h>
  24 #include <sound/pcm.h>
  25 #include <sound/initval.h>
  26 #include <sound/soc.h>
  27
  28 #include "pcm3008.h"
  29
  30 #define PCM3008_VERSION "0.2"
  31
  32 #define PCM3008_RATES (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |    \
  33                        SNDRV_PCM_RATE_48000)
  34
  35 static struct snd_soc_dai_driver pcm3008_dai = {
  36         .name = "pcm3008-hifi",
  37         .playback = {
  38                 .stream_name = "PCM3008 Playback",
  39                 .channels_min = 1,
  40                 .channels_max = 2,
  41                 .rates = PCM3008_RATES,
  42                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
  43         },
  44         .capture = {
  45                 .stream_name = "PCM3008 Capture",
  46                 .channels_min = 1,
  47                 .channels_max = 2,
  48                 .rates = PCM3008_RATES,
  49                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
  50         },
  51 };
  52
  53 static void pcm3008_gpio_free(struct pcm3008_setup_data *setup)
  54 {
  55         gpio_free(setup->dem0_pin);
  56         gpio_free(setup->dem1_pin);
  57         gpio_free(setup->pdad_pin);
  58         gpio_free(setup->pdda_pin);
  59 }
  60
  61 static int pcm3008_soc_probe(struct snd_soc_codec *codec)
  62 {
  63         struct pcm3008_setup_data *setup = codec->dev->platform_data;
  64         int ret = 0;
  65
  66         printk(KERN_INFO "PCM3008 SoC Audio Codec %s\n", PCM3008_VERSION);
  67
  68         /* DEM1  DEM0  DE-EMPHASIS_MODE
  69          * Low   Low   De-emphasis 44.1 kHz ON
  70          * Low   High  De-emphasis OFF
  71          * High  Low   De-emphasis 48 kHz ON
  72          * High  High  De-emphasis 32 kHz ON
  73          */
  74
  75         /* Configure DEM0 GPIO (turning OFF DAC De-emphasis). */
  76         ret = gpio_request(setup->dem0_pin, "codec_dem0");
  77         if (ret == 0)
  78                 ret = gpio_direction_output(setup->dem0_pin, 1);
  79         if (ret != 0)
  80                 goto gpio_err;
  81
  82         /* Configure DEM1 GPIO (turning OFF DAC De-emphasis). */
  83         ret = gpio_request(setup->dem1_pin, "codec_dem1");
  84         if (ret == 0)
  85                 ret = gpio_direction_output(setup->dem1_pin, 0);
  86         if (ret != 0)
  87                 goto gpio_err;
  88
  89         /* Configure PDAD GPIO. */
  90         ret = gpio_request(setup->pdad_pin, "codec_pdad");
  91         if (ret == 0)
  92                 ret = gpio_direction_output(setup->pdad_pin, 1);
  93         if (ret != 0)
  94                 goto gpio_err;
  95
  96         /* Configure PDDA GPIO. */
  97         ret = gpio_request(setup->pdda_pin, "codec_pdda");
  98         if (ret == 0)
  99                 ret = gpio_direction_output(setup->pdda_pin, 1);
 100         if (ret != 0)
 101                 goto gpio_err;
 102
 103         return ret;
 104
 105 gpio_err:
 106         pcm3008_gpio_free(setup);
 107
 108         return ret;
 109 }
 110
 111 static int pcm3008_soc_remove(struct snd_soc_codec *codec)
 112 {
 113         struct pcm3008_setup_data *setup = codec->dev->platform_data;
 114
 115         pcm3008_gpio_free(setup);
 116         return 0;
 117 }
 118
 119 #ifdef CONFIG_PM
 120 static int pcm3008_soc_suspend(struct snd_soc_codec *codec, pm_message_t msg)
 121 {
 122         struct pcm3008_setup_data *setup = codec->dev->platform_data;
 123
 124         gpio_set_value(setup->pdad_pin, 0);
 125         gpio_set_value(setup->pdda_pin, 0);
 126
 127         return 0;
 128 }
 129
 130 static int pcm3008_soc_resume(struct snd_soc_codec *codec)
 131 {
 132         struct pcm3008_setup_data *setup = codec->dev->platform_data;
 133
 134         gpio_set_value(setup->pdad_pin, 1);
 135         gpio_set_value(setup->pdda_pin, 1);
 136
 137         return 0;
 138 }
 139 #else
 140 #define pcm3008_soc_suspend NULL
 141 #define pcm3008_soc_resume NULL
 142 #endif
 143
 144 static struct snd_soc_codec_driver soc_codec_dev_pcm3008 = {
 145         .probe =        pcm3008_soc_probe,
 146         .remove =       pcm3008_soc_remove,
 147         .suspend =      pcm3008_soc_suspend,
 148         .resume =       pcm3008_soc_resume,
 149 };
 150
 151 static int __devinit pcm3008_codec_probe(struct platform_device *pdev)
 152 {
 153         return snd_soc_register_codec(&pdev->dev,
 154                         &soc_codec_dev_pcm3008, &pcm3008_dai, 1);
 155 }
 156
 157 static int __devexit pcm3008_codec_remove(struct platform_device *pdev)
 158 {
 159         snd_soc_unregister_codec(&pdev->dev);
 160         return 0;
 161 }
 162
 163 MODULE_ALIAS("platform:pcm3008-codec");
 164
 165 static struct platform_driver pcm3008_codec_driver = {
 166         .probe          = pcm3008_codec_probe,
 167         .remove         = __devexit_p(pcm3008_codec_remove),
 168         .driver         = {
 169                 .name   = "pcm3008-codec",
 170                 .owner  = THIS_MODULE,
 171         },
 172 };
 173
 174 static int __init pcm3008_modinit(void)
 175 {
 176         return platform_driver_register(&pcm3008_codec_driver);
 177 }
 178 module_init(pcm3008_modinit);
 179
 180 static void __exit pcm3008_exit(void)
 181 {
 182         platform_driver_unregister(&pcm3008_codec_driver);
 183 }
 184 module_exit(pcm3008_exit);
 185
 186 MODULE_DESCRIPTION("Soc PCM3008 driver");
 187 MODULE_AUTHOR("Hugo Villeneuve");
 188 MODULE_LICENSE("GPL");