sound/soc/atmel/sam9x5_wm8731.c

   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
  39 struct sam9x5_drvdata {
  40         int ssc_id;
  41 };
  42
  43 /*
  44  * Logic for a wm8731 as connected on a at91sam9x5ek based board.
  45  */
  46 static 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  */
  73 static 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
  78 static 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
 169 out_put_audio:
 170         atmel_ssc_put_audio(priv->ssc_id);
 171 out:
 172         return ret;
 173 }
 174
 175 static 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
 186 static const struct of_device_id sam9x5_wm8731_of_match[] = {
 187         { .compatible = "atmel,sam9x5-wm8731-audio", },
 188         {},
 189 };
 190 MODULE_DEVICE_TABLE(of, sam9x5_wm8731_of_match);
 191
 192 static struct platform_driver sam9x5_wm8731_driver = {
 193         .driver = {
 194                 .name = DRV_NAME,
 195                 .of_match_table = of_match_ptr(sam9x5_wm8731_of_match),
 196         },
 197         .probe = sam9x5_wm8731_driver_probe,
 198         .remove = sam9x5_wm8731_driver_remove,
 199 };
 200 module_platform_driver(sam9x5_wm8731_driver);
 201
 202 /* Module information */
 203 MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@atmel.com>");
 204 MODULE_AUTHOR("Richard Genoud <richard.genoud@gmail.com>");
 205 MODULE_DESCRIPTION("ALSA SoC machine driver for AT91SAM9x5 - WM8731");
 206 MODULE_LICENSE("GPL");
 207 MODULE_ALIAS("platform:" DRV_NAME);