linux/sound/soc/atmel/sam9x5_wm8731.c
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   1/*
   2 * sam9x5_wm8731   --   SoC audio for AT91SAM9X5-based boards
   3 *                      that are using WM8731 as codec.
   4 *
   5 *  Copyright (C) 2011 Atmel,
   6 *                Nicolas Ferre <nicolas.ferre@atmel.com>
   7 *
   8 *  Copyright (C) 2013 Paratronic,
   9 *                Richard Genoud <richard.genoud@gmail.com>
  10 *
  11 * Based on sam9g20_wm8731.c by:
  12 * Sedji Gaouaou <sedji.gaouaou@atmel.com>
  13 *
  14 *  This program is free software; you can redistribute  it and/or modify it
  15 *  under  the terms of  the GNU General  Public License as published by the
  16 *  Free Software Foundation;  either version 2 of the  License, or (at your
  17 *  option) any later version.
  18 *
  19 */
  20#include <linux/of.h>
  21#include <linux/export.h>
  22#include <linux/module.h>
  23#include <linux/mod_devicetable.h>
  24#include <linux/platform_device.h>
  25#include <linux/device.h>
  26
  27#include <sound/soc.h>
  28#include <sound/soc-dai.h>
  29#include <sound/soc-dapm.h>
  30
  31#include "../codecs/wm8731.h"
  32#include "atmel_ssc_dai.h"
  33
  34
  35#define MCLK_RATE 12288000
  36
  37#define DRV_NAME "sam9x5-snd-wm8731"
  38
  39struct sam9x5_drvdata {
  40        int ssc_id;
  41};
  42
  43/*
  44 * Logic for a wm8731 as connected on a at91sam9x5ek based board.
  45 */
  46static int sam9x5_wm8731_init(struct snd_soc_pcm_runtime *rtd)
  47{
  48        struct snd_soc_dai *codec_dai = rtd->codec_dai;
  49        struct device *dev = rtd->dev;
  50        int ret;
  51
  52        dev_dbg(dev, "ASoC: %s called\n", __func__);
  53
  54        /* set the codec system clock for DAC and ADC */
  55        ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_XTAL,
  56                                     MCLK_RATE, SND_SOC_CLOCK_IN);
  57        if (ret < 0) {
  58                dev_err(dev, "ASoC: Failed to set WM8731 SYSCLK: %d\n", ret);
  59                return ret;
  60        }
  61
  62        return 0;
  63}
  64
  65/*
  66 * Audio paths on at91sam9x5ek board:
  67 *
  68 *  |A| ------------> |      | ---R----> Headphone Jack
  69 *  |T| <----\        |  WM  | ---L--/
  70 *  |9| ---> CLK <--> | 8731 | <--R----- Line In Jack
  71 *  |1| <------------ |      | <--L--/
  72 */
  73static const struct snd_soc_dapm_widget sam9x5_dapm_widgets[] = {
  74        SND_SOC_DAPM_HP("Headphone Jack", NULL),
  75        SND_SOC_DAPM_LINE("Line In Jack", NULL),
  76};
  77
  78static int sam9x5_wm8731_driver_probe(struct platform_device *pdev)
  79{
  80        struct device_node *np = pdev->dev.of_node;
  81        struct device_node *codec_np, *cpu_np;
  82        struct snd_soc_card *card;
  83        struct snd_soc_dai_link *dai;
  84        struct sam9x5_drvdata *priv;
  85        int ret;
  86
  87        if (!np) {
  88                dev_err(&pdev->dev, "No device node supplied\n");
  89                return -EINVAL;
  90        }
  91
  92        card = devm_kzalloc(&pdev->dev, sizeof(*card), GFP_KERNEL);
  93        priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
  94        dai = devm_kzalloc(&pdev->dev, sizeof(*dai), GFP_KERNEL);
  95        if (!dai || !card || !priv) {
  96                ret = -ENOMEM;
  97                goto out;
  98        }
  99
 100        snd_soc_card_set_drvdata(card, priv);
 101
 102        card->dev = &pdev->dev;
 103        card->owner = THIS_MODULE;
 104        card->dai_link = dai;
 105        card->num_links = 1;
 106        card->dapm_widgets = sam9x5_dapm_widgets;
 107        card->num_dapm_widgets = ARRAY_SIZE(sam9x5_dapm_widgets);
 108        dai->name = "WM8731";
 109        dai->stream_name = "WM8731 PCM";
 110        dai->codec_dai_name = "wm8731-hifi";
 111        dai->init = sam9x5_wm8731_init;
 112        dai->dai_fmt = SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_NB_NF
 113                | SND_SOC_DAIFMT_CBM_CFM;
 114
 115        ret = snd_soc_of_parse_card_name(card, "atmel,model");
 116        if (ret) {
 117                dev_err(&pdev->dev, "atmel,model node missing\n");
 118                goto out;
 119        }
 120
 121        ret = snd_soc_of_parse_audio_routing(card, "atmel,audio-routing");
 122        if (ret) {
 123                dev_err(&pdev->dev, "atmel,audio-routing node missing\n");
 124                goto out;
 125        }
 126
 127        codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);
 128        if (!codec_np) {
 129                dev_err(&pdev->dev, "atmel,audio-codec node missing\n");
 130                ret = -EINVAL;
 131                goto out;
 132        }
 133
 134        dai->codec_of_node = codec_np;
 135
 136        cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0);
 137        if (!cpu_np) {
 138                dev_err(&pdev->dev, "atmel,ssc-controller node missing\n");
 139                ret = -EINVAL;
 140                goto out;
 141        }
 142        dai->cpu_of_node = cpu_np;
 143        dai->platform_of_node = cpu_np;
 144
 145        priv->ssc_id = of_alias_get_id(cpu_np, "ssc");
 146
 147        ret = atmel_ssc_set_audio(priv->ssc_id);
 148        if (ret != 0) {
 149                dev_err(&pdev->dev,
 150                        "ASoC: Failed to set SSC %d for audio: %d\n",
 151                        ret, priv->ssc_id);
 152                goto out;
 153        }
 154
 155        of_node_put(codec_np);
 156        of_node_put(cpu_np);
 157
 158        ret = snd_soc_register_card(card);
 159        if (ret) {
 160                dev_err(&pdev->dev,
 161                        "ASoC: Platform device allocation failed\n");
 162                goto out_put_audio;
 163        }
 164
 165        dev_dbg(&pdev->dev, "ASoC: %s ok\n", __func__);
 166
 167        return ret;
 168
 169out_put_audio:
 170        atmel_ssc_put_audio(priv->ssc_id);
 171out:
 172        return ret;
 173}
 174
 175static int sam9x5_wm8731_driver_remove(struct platform_device *pdev)
 176{
 177        struct snd_soc_card *card = platform_get_drvdata(pdev);
 178        struct sam9x5_drvdata *priv = card->drvdata;
 179
 180        snd_soc_unregister_card(card);
 181        atmel_ssc_put_audio(priv->ssc_id);
 182
 183        return 0;
 184}
 185
 186static const struct of_device_id sam9x5_wm8731_of_match[] = {
 187        { .compatible = "atmel,sam9x5-wm8731-audio", },
 188        {},
 189};
 190MODULE_DEVICE_TABLE(of, sam9x5_wm8731_of_match);
 191
 192static struct platform_driver sam9x5_wm8731_driver = {
 193        .driver = {
 194                .name = DRV_NAME,
 195                .owner = THIS_MODULE,
 196                .of_match_table = of_match_ptr(sam9x5_wm8731_of_match),
 197        },
 198        .probe = sam9x5_wm8731_driver_probe,
 199        .remove = sam9x5_wm8731_driver_remove,
 200};
 201module_platform_driver(sam9x5_wm8731_driver);
 202
 203/* Module information */
 204MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@atmel.com>");
 205MODULE_AUTHOR("Richard Genoud <richard.genoud@gmail.com>");
 206MODULE_DESCRIPTION("ALSA SoC machine driver for AT91SAM9x5 - WM8731");
 207MODULE_LICENSE("GPL");
 208MODULE_ALIAS("platform:" DRV_NAME);
 209
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