1. 根目录:
2. sound
3. soc
4. fsl
5. imx-wm8962.c

/*
 * Copyright 2013 Freescale Semiconductor, Inc.
 *
 * Based on imx-sgtl5000.c
 * Copyright 2012 Freescale Semiconductor, Inc.
 * Copyright 2012 Linaro Ltd.
 *
 * The code contained herein is licensed under the GNU General Public
 * License. You may obtain a copy of the GNU General Public License
 * Version 2 or later at the following locations:
 *
 * http://www.opensource.org/licenses/gpl-license.html
 * http://www.gnu.org/copyleft/gpl.html
 */

#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/clk.h>
#include <sound/soc.h>
#include <sound/pcm_params.h>
#include <sound/soc-dapm.h>
#include <linux/pinctrl/consumer.h>

#include "../codecs/wm8962.h"
#include "imx-audmux.h"

#define DAI_NAME_SIZE	32

struct imx_wm8962_data {
	struct snd_soc_dai_link dai;
	struct snd_soc_card card;
	char codec_dai_name[DAI_NAME_SIZE];
	char platform_name[DAI_NAME_SIZE];
	struct clk *codec_clk;
	unsigned int clk_frequency;
};

struct imx_priv {
	struct platform_device *pdev;
};
static struct imx_priv card_priv;

static const struct snd_soc_dapm_widget imx_wm8962_dapm_widgets[] = {
	SND_SOC_DAPM_HP("Headphone Jack", NULL),
	SND_SOC_DAPM_SPK("Ext Spk", NULL),
	SND_SOC_DAPM_MIC("AMIC", NULL),
	SND_SOC_DAPM_MIC("DMIC", NULL),
};

static int sample_rate = 44100;
static snd_pcm_format_t sample_format = SNDRV_PCM_FORMAT_S16_LE;

static int imx_hifi_hw_params(struct snd_pcm_substream *substream,
		struct snd_pcm_hw_params *params)
{
	sample_rate = params_rate(params);
	sample_format = params_format(params);

	return 0;
}

static struct snd_soc_ops imx_hifi_ops = {
	.hw_params = imx_hifi_hw_params,
};

static int imx_wm8962_set_bias_level(struct snd_soc_card *card,
					struct snd_soc_dapm_context *dapm,
					enum snd_soc_bias_level level)
{
	struct snd_soc_dai *codec_dai = card->rtd[0].codec_dai;
	struct imx_priv *priv = &card_priv;
	struct imx_wm8962_data *data = snd_soc_card_get_drvdata(card);
	struct device *dev = &priv->pdev->dev;
	unsigned int pll_out;
	int ret;

	if (dapm->dev != codec_dai->dev)
		return 0;

	switch (level) {
	case SND_SOC_BIAS_PREPARE:
		if (dapm->bias_level == SND_SOC_BIAS_STANDBY) {
			if (sample_format == SNDRV_PCM_FORMAT_S24_LE)
				pll_out = sample_rate * 384;
			else
				pll_out = sample_rate * 256;

			ret = snd_soc_dai_set_pll(codec_dai, WM8962_FLL,
					WM8962_FLL_MCLK, data->clk_frequency,
					pll_out);
			if (ret < 0) {
				dev_err(dev, "failed to start FLL: %d\n", ret);
				return ret;
			}

			ret = snd_soc_dai_set_sysclk(codec_dai,
					WM8962_SYSCLK_FLL, pll_out,
					SND_SOC_CLOCK_IN);
			if (ret < 0) {
				dev_err(dev, "failed to set SYSCLK: %d\n", ret);
				return ret;
			}
		}
		break;

	case SND_SOC_BIAS_STANDBY:
		if (dapm->bias_level == SND_SOC_BIAS_PREPARE) {
			ret = snd_soc_dai_set_sysclk(codec_dai,
					WM8962_SYSCLK_MCLK, data->clk_frequency,
					SND_SOC_CLOCK_IN);
			if (ret < 0) {
				dev_err(dev,
					"failed to switch away from FLL: %d\n",
					ret);
				return ret;
			}

			ret = snd_soc_dai_set_pll(codec_dai, WM8962_FLL,
					0, 0, 0);
			if (ret < 0) {
				dev_err(dev, "failed to stop FLL: %d\n", ret);
				return ret;
			}
		}
		break;

	default:
		break;
	}

	return 0;
}

static int imx_wm8962_late_probe(struct snd_soc_card *card)
{
	struct snd_soc_dai *codec_dai = card->rtd[0].codec_dai;
	struct imx_priv *priv = &card_priv;
	struct imx_wm8962_data *data = snd_soc_card_get_drvdata(card);
	struct device *dev = &priv->pdev->dev;
	int ret;

	ret = snd_soc_dai_set_sysclk(codec_dai, WM8962_SYSCLK_MCLK,
			data->clk_frequency, SND_SOC_CLOCK_IN);
	if (ret < 0)
		dev_err(dev, "failed to set sysclk in %s\n", __func__);

	return ret;
}

static int imx_wm8962_probe(struct platform_device *pdev)
{
	struct device_node *np = pdev->dev.of_node;
	struct device_node *ssi_np, *codec_np;
	struct platform_device *ssi_pdev;
	struct imx_priv *priv = &card_priv;
	struct i2c_client *codec_dev;
	struct imx_wm8962_data *data;
	int int_port, ext_port;
	int ret;

	priv->pdev = pdev;

	ret = of_property_read_u32(np, "mux-int-port", &int_port);
	if (ret) {
		dev_err(&pdev->dev, "mux-int-port missing or invalid\n");
		return ret;
	}
	ret = of_property_read_u32(np, "mux-ext-port", &ext_port);
	if (ret) {
		dev_err(&pdev->dev, "mux-ext-port missing or invalid\n");
		return ret;
	}

	/*
	 * The port numbering in the hardware manual starts at 1, while
	 * the audmux API expects it starts at 0.
	 */
	int_port--;
	ext_port--;
	ret = imx_audmux_v2_configure_port(int_port,
			IMX_AUDMUX_V2_PTCR_SYN |
			IMX_AUDMUX_V2_PTCR_TFSEL(ext_port) |
			IMX_AUDMUX_V2_PTCR_TCSEL(ext_port) |
			IMX_AUDMUX_V2_PTCR_TFSDIR |
			IMX_AUDMUX_V2_PTCR_TCLKDIR,
			IMX_AUDMUX_V2_PDCR_RXDSEL(ext_port));
	if (ret) {
		dev_err(&pdev->dev, "audmux internal port setup failed\n");
		return ret;
	}
	ret = imx_audmux_v2_configure_port(ext_port,
			IMX_AUDMUX_V2_PTCR_SYN,
			IMX_AUDMUX_V2_PDCR_RXDSEL(int_port));
	if (ret) {
		dev_err(&pdev->dev, "audmux external port setup failed\n");
		return ret;
	}

	ssi_np = of_parse_phandle(pdev->dev.of_node, "ssi-controller", 0);
	codec_np = of_parse_phandle(pdev->dev.of_node, "audio-codec", 0);
	if (!ssi_np || !codec_np) {
		dev_err(&pdev->dev, "phandle missing or invalid\n");
		ret = -EINVAL;
		goto fail;
	}

	ssi_pdev = of_find_device_by_node(ssi_np);
	if (!ssi_pdev) {
		dev_err(&pdev->dev, "failed to find SSI platform device\n");
		ret = -EINVAL;
		goto fail;
	}
	codec_dev = of_find_i2c_device_by_node(codec_np);
	if (!codec_dev || !codec_dev->dev.driver) {
		dev_err(&pdev->dev, "failed to find codec platform device\n");
		ret = -EINVAL;
		goto fail;
	}

	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
	if (!data) {
		ret = -ENOMEM;
		goto fail;
	}

	data->codec_clk = devm_clk_get(&codec_dev->dev, NULL);
	if (IS_ERR(data->codec_clk)) {
		ret = PTR_ERR(data->codec_clk);
		dev_err(&codec_dev->dev, "failed to get codec clk: %d\n", ret);
		goto fail;
	}

	data->clk_frequency = clk_get_rate(data->codec_clk);
	ret = clk_prepare_enable(data->codec_clk);
	if (ret) {
		dev_err(&codec_dev->dev, "failed to enable codec clk: %d\n", ret);
		goto fail;
	}

	data->dai.name = "HiFi";
	data->dai.stream_name = "HiFi";
	data->dai.codec_dai_name = "wm8962";
	data->dai.codec_of_node = codec_np;
	data->dai.cpu_dai_name = dev_name(&ssi_pdev->dev);
	data->dai.platform_of_node = ssi_np;
	data->dai.ops = &imx_hifi_ops;
	data->dai.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
			    SND_SOC_DAIFMT_CBM_CFM;

	data->card.dev = &pdev->dev;
	ret = snd_soc_of_parse_card_name(&data->card, "model");
	if (ret)
		goto clk_fail;
	ret = snd_soc_of_parse_audio_routing(&data->card, "audio-routing");
	if (ret)
		goto clk_fail;
	data->card.num_links = 1;
	data->card.owner = THIS_MODULE;
	data->card.dai_link = &data->dai;
	data->card.dapm_widgets = imx_wm8962_dapm_widgets;
	data->card.num_dapm_widgets = ARRAY_SIZE(imx_wm8962_dapm_widgets);

	data->card.late_probe = imx_wm8962_late_probe;
	data->card.set_bias_level = imx_wm8962_set_bias_level;

	platform_set_drvdata(pdev, &data->card);
	snd_soc_card_set_drvdata(&data->card, data);

	ret = devm_snd_soc_register_card(&pdev->dev, &data->card);
	if (ret) {
		dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n", ret);
		goto clk_fail;
	}

	of_node_put(ssi_np);
	of_node_put(codec_np);

	return 0;

clk_fail:
	clk_disable_unprepare(data->codec_clk);
fail:
	of_node_put(ssi_np);
	of_node_put(codec_np);

	return ret;
}

static int imx_wm8962_remove(struct platform_device *pdev)
{
	struct snd_soc_card *card = platform_get_drvdata(pdev);
	struct imx_wm8962_data *data = snd_soc_card_get_drvdata(card);

	if (!IS_ERR(data->codec_clk))
		clk_disable_unprepare(data->codec_clk);

	return 0;
}

static const struct of_device_id imx_wm8962_dt_ids[] = {
	{ .compatible = "fsl,imx-audio-wm8962", },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, imx_wm8962_dt_ids);

static struct platform_driver imx_wm8962_driver = {
	.driver = {
		.name = "imx-wm8962",
		.pm = &snd_soc_pm_ops,
		.of_match_table = imx_wm8962_dt_ids,
	},
	.probe = imx_wm8962_probe,
	.remove = imx_wm8962_remove,
};
module_platform_driver(imx_wm8962_driver);

MODULE_AUTHOR("Freescale Semiconductor, Inc.");
MODULE_DESCRIPTION("Freescale i.MX WM8962 ASoC machine driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:imx-wm8962");