Quelle  sam9x5_wm8731.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * sam9x5_wm8731   -- SoC audio for AT91SAM9X5-based boards
 * that are using WM8731 as codec.
 *
 *  Copyright (C) 2011 Atmel,
 *   Nicolas Ferre <nicolas.ferre@atmel.com>
 *
 *  Copyright (C) 2013 Paratronic,
 *   Richard Genoud <richard.genoud@gmail.com>
 *
 * Based on sam9g20_wm8731.c by:
 * Sedji Gaouaou <sedji.gaouaou@atmel.com>
 */
#include <linux/of.h>
#include <linux/export.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/platform_device.h>
#include <linux/device.h>

#include <sound/soc.h>
#include <sound/soc-dai.h>
#include <sound/soc-dapm.h>

#include "../codecs/wm8731.h"
#include "atmel_ssc_dai.h"


#define MCLK_RATE 12288000

#define DRV_NAME "sam9x5-snd-wm8731"

struct sam9x5_drvdata {
 int ssc_id;
};

/*
 * Logic for a wm8731 as connected on a at91sam9x5ek based board.
 */
static int sam9x5_wm8731_init(struct snd_soc_pcm_runtime *rtd)
{
 struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, 0);
 struct device *dev = rtd->dev;
 int ret;

 dev_dbg(dev, "%s called\n", __func__);

 /* set the codec system clock for DAC and ADC */
 ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_XTAL,
         MCLK_RATE, SND_SOC_CLOCK_IN);
 if (ret < 0) {
  dev_err(dev, "Failed to set WM8731 SYSCLK: %d\n", ret);
  return ret;
 }

 return 0;
}

/*
 * Audio paths on at91sam9x5ek board:
 *
 *  |A| ------------> |      | ---R----> Headphone Jack
 *  |T| <----\        |  WM  | ---L--/
 *  |9| ---> CLK <--> | 8731 | <--R----- Line In Jack
 *  |1| <------------ |      | <--L--/
 */
static const struct snd_soc_dapm_widget sam9x5_dapm_widgets[] = {
 SND_SOC_DAPM_HP("Headphone Jack", NULL),
 SND_SOC_DAPM_LINE("Line In Jack", NULL),
};

static int sam9x5_wm8731_driver_probe(struct platform_device *pdev)
{
 struct device_node *np = pdev->dev.of_node;
 struct device_node *codec_np, *cpu_np;
 struct snd_soc_card *card;
 struct snd_soc_dai_link *dai;
 struct sam9x5_drvdata *priv;
 struct snd_soc_dai_link_component *comp;
 int ret;

 if (!np) {
  dev_err(&pdev->dev, "No device node supplied\n");
  return -EINVAL;
 }

 card = devm_kzalloc(&pdev->dev, sizeof(*card), GFP_KERNEL);
 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
 dai = devm_kzalloc(&pdev->dev, sizeof(*dai), GFP_KERNEL);
 comp = devm_kzalloc(&pdev->dev, 3 * sizeof(*comp), GFP_KERNEL);
 if (!dai || !card || !priv || !comp) {
  ret = -ENOMEM;
  goto out;
 }

 snd_soc_card_set_drvdata(card, priv);

 card->dev = &pdev->dev;
 card->owner = THIS_MODULE;
 card->dai_link = dai;
 card->num_links = 1;
 card->dapm_widgets = sam9x5_dapm_widgets;
 card->num_dapm_widgets = ARRAY_SIZE(sam9x5_dapm_widgets);

 dai->cpus = &comp[0];
 dai->num_cpus = 1;
 dai->codecs = &comp[1];
 dai->num_codecs = 1;
 dai->platforms = &comp[2];
 dai->num_platforms = 1;

 dai->name = "WM8731";
 dai->stream_name = "WM8731 PCM";
 dai->codecs->dai_name = "wm8731-hifi";
 dai->init = sam9x5_wm8731_init;
 dai->dai_fmt = SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_NB_NF
  | SND_SOC_DAIFMT_CBP_CFP;

 ret = snd_soc_of_parse_card_name(card, "atmel,model");
 if (ret) {
  dev_err(&pdev->dev, "atmel,model node missing\n");
  goto out;
 }

 ret = snd_soc_of_parse_audio_routing(card, "atmel,audio-routing");
 if (ret) {
  dev_err(&pdev->dev, "atmel,audio-routing node missing\n");
  goto out;
 }

 codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);
 if (!codec_np) {
  dev_err(&pdev->dev, "atmel,audio-codec node missing\n");
  ret = -EINVAL;
  goto out;
 }

 dai->codecs->of_node = codec_np;

 cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0);
 if (!cpu_np) {
  dev_err(&pdev->dev, "atmel,ssc-controller node missing\n");
  ret = -EINVAL;
  goto out_put_codec_np;
 }
 dai->cpus->of_node = cpu_np;
 dai->platforms->of_node = cpu_np;

 priv->ssc_id = of_alias_get_id(cpu_np, "ssc");

 ret = atmel_ssc_set_audio(priv->ssc_id);
 if (ret != 0) {
  dev_err(&pdev->dev, "Failed to set SSC %d for audio: %d\n",
   ret, priv->ssc_id);
  goto out_put_cpu_np;
 }

 ret = devm_snd_soc_register_card(&pdev->dev, card);
 if (ret) {
  dev_err(&pdev->dev, "Platform device allocation failed\n");
  goto out_put_audio;
 }

 dev_dbg(&pdev->dev, "%s ok\n", __func__);

 goto out_put_cpu_np;

out_put_audio:
 atmel_ssc_put_audio(priv->ssc_id);
out_put_cpu_np:
 of_node_put(cpu_np);
out_put_codec_np:
 of_node_put(codec_np);
out:
 return ret;
}

static void sam9x5_wm8731_driver_remove(struct platform_device *pdev)
{
 struct snd_soc_card *card = platform_get_drvdata(pdev);
 struct sam9x5_drvdata *priv = card->drvdata;

 atmel_ssc_put_audio(priv->ssc_id);
}

static const struct of_device_id sam9x5_wm8731_of_match[] = {
 { .compatible = "atmel,sam9x5-wm8731-audio", },
 {},
};
MODULE_DEVICE_TABLE(of, sam9x5_wm8731_of_match);

static struct platform_driver sam9x5_wm8731_driver = {
 .driver = {
  .name = DRV_NAME,
  .of_match_table = of_match_ptr(sam9x5_wm8731_of_match),
 },
 .probe = sam9x5_wm8731_driver_probe,
 .remove = sam9x5_wm8731_driver_remove,
};
module_platform_driver(sam9x5_wm8731_driver);

/* Module information */
MODULE_AUTHOR("Nicolas Ferre ");
MODULE_AUTHOR("Richard Genoud ");
MODULE_DESCRIPTION("ALSA SoC machine driver for AT91SAM9x5 - WM8731");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DRV_NAME);