openrex-linux-3.14/sound/soc/fsl/imx-tda1997x.c

/*
 * SoC audio for i.MX boards with tda1997x HDMI receiver
 * based off sound/soc/fsl/imx-sgtl5000.c
 *
 * Copyright 2013 Tim Harvey, Gateworks Corporation <tharvey@gateworks.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/clk.h>
#include <linux/mfd/tda1997x-core.h>
#include <linux/module.h>
#include <linux/gpio.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <sound/core.h>
#include <sound/soc.h>

#include "imx-audmux.h"

#define DAI_NAME_SIZE	32

struct imx_tda1997x_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];
};

static int imx_tda1997x_dai_init(struct snd_soc_pcm_runtime *rtd)
{
	return 0;
}

static int imx_tda1997x_audmux_config(struct platform_device *pdev)
{
	struct device_node *np = pdev->dev.of_node;
	int int_port, ext_port;
	int ret;

	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 |
			(1<<30) | /* use RXFS from port instead of TXFS */
			(1<<25),  /* use RXC from port instead of TXC */
			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;
	}

	return 0;
}

static int imx_tda1997x_probe(struct platform_device *pdev)
{
	struct device_node *cpu_np, *codec_np;
	struct platform_device *cpu_pdev;
	struct imx_tda1997x_data *data;
	int ret;

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

	if (strstr(cpu_np->name, "ssi")) {
		ret = imx_tda1997x_audmux_config(pdev);
		if (ret)
			goto fail;
	}

	cpu_pdev = of_find_device_by_node(cpu_np);
	if (!cpu_pdev) {
		dev_err(&pdev->dev, "failed to find SSI platform device\n");
		ret = -EINVAL;
		goto fail;
	}

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

	data->dai.name = "i.MX HDMI Audio Rx";
	data->dai.stream_name = "i.MX HDMI Audio Rx";
	data->dai.codec_dai_name = "tda1997x";
	data->dai.codec_of_node = codec_np;
	data->dai.cpu_of_node = cpu_np;
	data->dai.platform_of_node = cpu_np;
	data->dai.init = &imx_tda1997x_dai_init;
	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 fail;
	data->card.num_links = 1;
	data->card.owner = THIS_MODULE;
	data->card.dai_link = &data->dai;

	/* register card with ASoC core */
	ret = snd_soc_register_card(&data->card);
	if (ret) {
		dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n", ret);
		goto fail;
	}

	platform_set_drvdata(pdev, data);
fail:
	if (cpu_np)
		of_node_put(cpu_np);
	if (codec_np)
		of_node_put(codec_np);

	return ret;
}

static int imx_tda1997x_remove(struct platform_device *pdev)
{
	struct imx_tda1997x_data *data = platform_get_drvdata(pdev);

	snd_soc_unregister_card(&data->card);

	return 0;
}

static const struct of_device_id imx_tda1997x_dt_ids[] = {
	{ .compatible = "fsl,imx-audio-tda1997x", },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, imx_tda1997x_dt_ids);

static struct platform_driver imx_tda1997x_audio_driver = {
	.driver = {
		.name = "imx-tda1997x-audio",
		.owner = THIS_MODULE,
		.of_match_table = imx_tda1997x_dt_ids,
	},
	.probe = imx_tda1997x_probe,
	.remove = imx_tda1997x_remove,
};

module_platform_driver(imx_tda1997x_audio_driver);

MODULE_AUTHOR("Tim Harvey <tharvey@gateworks.com>");
MODULE_DESCRIPTION("Freescale i.MX TDA1997X RX ASoC machine driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:imx-tda1997x-audio");