LXR linux/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
  31static 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
  44static 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
  57static const struct snd_soc_dapm_widget pcm3008_dapm_widgets[] = {
  58SND_SOC_DAPM_INPUT("VINL"),
  59SND_SOC_DAPM_INPUT("VINR"),
  60
  61SND_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),
  63SND_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
  66SND_SOC_DAPM_OUTPUT("VOUTL"),
  67SND_SOC_DAPM_OUTPUT("VOUTR"),
  68};
  69
  70static 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
  83static 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
 101static 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
 108static 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
 151static int pcm3008_codec_remove(struct platform_device *pdev)
 152{
 153        snd_soc_unregister_codec(&pdev->dev);
 154
 155        return 0;
 156}
 157
 158MODULE_ALIAS("platform:pcm3008-codec");
 159
 160static 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
 169module_platform_driver(pcm3008_codec_driver);
 170
 171MODULE_DESCRIPTION("Soc PCM3008 driver");
 172MODULE_AUTHOR("Hugo Villeneuve");
 173MODULE_LICENSE("GPL");
 174