/*
 * eukrea-tlv320.c  --  SoC audio for eukrea_cpuimxXX in I2S mode
 *
 * Copyright 2010 Eric Bénard, Eukréa Electromatique <eric@eukrea.com>
 *
 * based on sound/soc/s3c24xx/s3c24xx_simtec_tlv320aic23.c
 * which is Copyright 2009 Simtec Electronics
 * and on sound/soc/imx/phycore-ac97.c which is
 * Copyright 2009 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>
 *
 *  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.
 *
 */

#include <linux/errno.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/device.h>
#include <linux/i2c.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/soc.h>
#include <asm/mach-types.h>

#include "../codecs/tlv320aic23.h"
#include "imx-ssi.h"
#include "fsl_ssi.h"
#include "imx-audmux.h"

#define CODEC_CLOCK 12000000

static int eukrea_tlv320_hw_params(struct snd_pcm_substream *substream,
			    struct snd_pcm_hw_params *params)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *codec_dai = rtd->codec_dai;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	int ret;

	ret = snd_soc_dai_set_sysclk(codec_dai, 0,
				     CODEC_CLOCK, SND_SOC_CLOCK_OUT);
	if (ret) {
		dev_err(cpu_dai->dev,
			"Failed to set the codec sysclk.\n");
		return ret;
	}

	snd_soc_dai_set_tdm_slot(cpu_dai, 0x3, 0x3, 2, 0);

	ret = snd_soc_dai_set_sysclk(cpu_dai, IMX_SSP_SYS_CLK, 0,
				SND_SOC_CLOCK_IN);
	/* fsl_ssi lacks the set_sysclk ops */
	if (ret && ret != -EINVAL) {
		dev_err(cpu_dai->dev,
			"Can't set the IMX_SSP_SYS_CLK CPU system clock.\n");
		return ret;
	}

	return 0;
}

static struct snd_soc_ops eukrea_tlv320_snd_ops = {
	.hw_params	= eukrea_tlv320_hw_params,
};

static struct snd_soc_dai_link eukrea_tlv320_dai = {
	.name		= "tlv320aic23",
	.stream_name	= "TLV320AIC23",
	.codec_dai_name	= "tlv320aic23-hifi",
	.dai_fmt	= SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
			  SND_SOC_DAIFMT_CBM_CFM,
	.ops		= &eukrea_tlv320_snd_ops,
};

static struct snd_soc_card eukrea_tlv320 = {
	.owner		= THIS_MODULE,
	.dai_link	= &eukrea_tlv320_dai,
	.num_links	= 1,
};

static int eukrea_tlv320_probe(struct platform_device *pdev)
{
	int ret;
	int int_port = 0, ext_port;
	struct device_node *np = pdev->dev.of_node;
	struct device_node *ssi_np = NULL, *codec_np = NULL;

	eukrea_tlv320.dev = &pdev->dev;
	if (np) {
		ret = snd_soc_of_parse_card_name(&eukrea_tlv320,
						 "eukrea,model");
		if (ret) {
			dev_err(&pdev->dev,
				"eukrea,model node missing or invalid.\n");
			goto err;
		}

		ssi_np = of_parse_phandle(pdev->dev.of_node,
					  "ssi-controller", 0);
		if (!ssi_np) {
			dev_err(&pdev->dev,
				"ssi-controller missing or invalid.\n");
			ret = -ENODEV;
			goto err;
		}

		codec_np = of_parse_phandle(ssi_np, "codec-handle", 0);
		if (codec_np)
			eukrea_tlv320_dai.codec_of_node = codec_np;
		else
			dev_err(&pdev->dev, "codec-handle node missing or invalid.\n");

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

		/*
		 * The port numbering in the hardware manual starts at 1, while
		 * the audmux API expects it starts at 0.
		 */
		int_port--;
		ext_port--;

		eukrea_tlv320_dai.cpu_of_node = ssi_np;
		eukrea_tlv320_dai.platform_of_node = ssi_np;
	} else {
		eukrea_tlv320_dai.cpu_dai_name = "imx-ssi.0";
		eukrea_tlv320_dai.platform_name = "imx-ssi.0";
		eukrea_tlv320_dai.codec_name = "tlv320aic23-codec.0-001a";
		eukrea_tlv320.name = "cpuimx-audio";
	}

	if (machine_is_eukrea_cpuimx27() ||
	    of_find_compatible_node(NULL, NULL, "fsl,imx21-audmux")) {
		imx_audmux_v1_configure_port(MX27_AUDMUX_HPCR1_SSI0,
			IMX_AUDMUX_V1_PCR_SYN |
			IMX_AUDMUX_V1_PCR_TFSDIR |
			IMX_AUDMUX_V1_PCR_TCLKDIR |
			IMX_AUDMUX_V1_PCR_RFSDIR |
			IMX_AUDMUX_V1_PCR_RCLKDIR |
			IMX_AUDMUX_V1_PCR_TFCSEL(MX27_AUDMUX_HPCR3_SSI_PINS_4) |
			IMX_AUDMUX_V1_PCR_RFCSEL(MX27_AUDMUX_HPCR3_SSI_PINS_4) |
			IMX_AUDMUX_V1_PCR_RXDSEL(MX27_AUDMUX_HPCR3_SSI_PINS_4)
		);
		imx_audmux_v1_configure_port(MX27_AUDMUX_HPCR3_SSI_PINS_4,
			IMX_AUDMUX_V1_PCR_SYN |
			IMX_AUDMUX_V1_PCR_RXDSEL(MX27_AUDMUX_HPCR1_SSI0)
		);
	} else if (machine_is_eukrea_cpuimx25sd() ||
		   machine_is_eukrea_cpuimx35sd() ||
		   machine_is_eukrea_cpuimx51sd() ||
		   of_find_compatible_node(NULL, NULL, "fsl,imx31-audmux")) {
		if (!np)
			ext_port = machine_is_eukrea_cpuimx25sd() ?
				4 : 3;

		imx_audmux_v2_configure_port(int_port,
			IMX_AUDMUX_V2_PTCR_SYN |
			IMX_AUDMUX_V2_PTCR_TFSDIR |
			IMX_AUDMUX_V2_PTCR_TFSEL(ext_port) |
			IMX_AUDMUX_V2_PTCR_TCLKDIR |
			IMX_AUDMUX_V2_PTCR_TCSEL(ext_port),
			IMX_AUDMUX_V2_PDCR_RXDSEL(ext_port)
		);
		imx_audmux_v2_configure_port(ext_port,
			IMX_AUDMUX_V2_PTCR_SYN,
			IMX_AUDMUX_V2_PDCR_RXDSEL(int_port)
		);
	} else {
		if (np) {
			/* The eukrea,asoc-tlv320 driver was explicitly
			 * requested (through the device tree).
			 */
			dev_err(&pdev->dev,
				"Missing or invalid audmux DT node.\n");
			return -ENODEV;
		} else {
			/* Return happy.
			 * We might run on a totally different machine.
			 */
			return 0;
		}
	}

	ret = snd_soc_register_card(&eukrea_tlv320);
err:
	if (ret)
		dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n", ret);
	of_node_put(ssi_np);

	return ret;
}

static int eukrea_tlv320_remove(struct platform_device *pdev)
{
	snd_soc_unregister_card(&eukrea_tlv320);

	return 0;
}

static const struct of_device_id imx_tlv320_dt_ids[] = {
	{ .compatible = "eukrea,asoc-tlv320"},
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, imx_tlv320_dt_ids);

static struct platform_driver eukrea_tlv320_driver = {
	.driver = {
		.name = "eukrea_tlv320",
		.of_match_table = imx_tlv320_dt_ids,
	},
	.probe = eukrea_tlv320_probe,
	.remove = eukrea_tlv320_remove,
};

module_platform_driver(eukrea_tlv320_driver);

MODULE_AUTHOR("Eric Bénard <eric@eukrea.com>");
MODULE_DESCRIPTION("CPUIMX ALSA SoC driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:eukrea_tlv320");
