/*
 * omap3csb740.c  --  SoC audio for OMAP3 Csb740
 *
 * Author: Steve Sakoman <steve@sakoman.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * 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., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#include <linux/clk.h>
#include <linux/platform_device.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>

#include <asm/mach-types.h>
#include <mach/hardware.h>
#include <mach/gpio.h>
#include <mach/mcbsp.h>

#include "omap-mcbsp.h"
#include "omap-pcm.h"
#include "../codecs/wm8731.h"

static int omap3csb740_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->dai->codec_dai;
	struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
	int ret;

	/* Set codec DAI configuration */
	ret = snd_soc_dai_set_fmt(codec_dai,
				  SND_SOC_DAIFMT_I2S |
				  SND_SOC_DAIFMT_NB_NF |
														SND_SOC_DAIFMT_CBS_CFS);  /* debug only check this */ 
	if (ret < 0) {
		printk(KERN_ERR "can't set codec DAI configuration\n");
		return ret;
	}

	/* Set cpu DAI configuration */
	ret = snd_soc_dai_set_fmt(cpu_dai,
				  SND_SOC_DAIFMT_I2S |
				  SND_SOC_DAIFMT_NB_NF |
				  SND_SOC_DAIFMT_CBS_CFS);
	if (ret < 0) {
		printk(KERN_ERR "can't set cpu DAI configuration\n");
		return ret;
	}

	/* Set the codec system clock for DAC and ADC */
	ret = snd_soc_dai_set_sysclk(codec_dai, 0, 12288000,
					    SND_SOC_CLOCK_IN);
	if (ret < 0) {
		printk(KERN_ERR "can't set codec system clock\n");
		return ret;
	}

#if 1 /* debug only */
	/* Set McBSP clock to external */
	ret = snd_soc_dai_set_sysclk(cpu_dai, OMAP_MCBSP_SYSCLK_CLKS_EXT, 0,
					    SND_SOC_CLOCK_IN);
	if (ret < 0) {
		printk(KERN_ERR "can't set cpu system clock\n");
		return ret;
	}

	ret = snd_soc_dai_set_clkdiv(cpu_dai, OMAP_MCBSP_CLKGDV, 256);
	if (ret < 0) {
		printk(KERN_ERR "can't set SRG clock divider\n");
		return ret;
	}
#endif
	return 0;
}

static struct snd_soc_ops omap3csb740_ops = {
	.hw_params = omap3csb740_hw_params,
};

/* Digital audio interface glue - connects codec <--> CPU */
static struct snd_soc_dai_link omap3csb740_dai = {
	.name = "WM8731",
	.stream_name = "WM8731 PCM",
	.cpu_dai = &omap_mcbsp_dai[0],  /* use 1st one */
	.codec_dai = &wm8731_dai,
	.ops = &omap3csb740_ops,
};

/* Audio machine driver */
static struct snd_soc_card snd_soc_omap3csb740 = {
	.name = "omap3csb740",
	.platform = &omap_soc_platform,
	.dai_link = &omap3csb740_dai,
	.num_links = 1,
};

static struct wm8731_setup_data csb740_wm8731_setup = {
	.i2c_address = 0x1a,
	.i2c_bus = 1,  /* we use bus 1 */
};

/* Audio subsystem */
static struct snd_soc_device omap3csb740_snd_devdata = {
	.card = &snd_soc_omap3csb740,
	.codec_dev = &soc_codec_dev_wm8731,
	.codec_data = &csb740_wm8731_setup,
};

static struct platform_device *omap3csb740_snd_device;

static int __init omap3csb740_soc_init(void)
{
	int ret;

	pr_info("OMAP3 csb740 SoC init\n");

	omap3csb740_snd_device = platform_device_alloc("soc-audio", -1);
	if (!omap3csb740_snd_device) {
		printk(KERN_ERR "Platform device allocation failed\n");
		return -ENOMEM;
	}

	platform_set_drvdata(omap3csb740_snd_device, &omap3csb740_snd_devdata);
	omap3csb740_snd_devdata.dev = &omap3csb740_snd_device->dev;
	*(unsigned int *)omap_mcbsp_dai[0].private_data = 1; /* McBSP2 */
	*(unsigned int *)omap3csb740_dai.cpu_dai->private_data = 1; /* McBSP2 debug only? */

	ret = platform_device_add(omap3csb740_snd_device);
	if (ret)
		goto err1;

	return 0;

err1:
	printk(KERN_ERR "Unable to add platform device\n");
	platform_device_put(omap3csb740_snd_device);

	return ret;
}

static void __exit omap3csb740_soc_exit(void)
{
	platform_device_unregister(omap3csb740_snd_device);
}

module_init(omap3csb740_soc_init);
module_exit(omap3csb740_soc_exit);

MODULE_AUTHOR("Rick Bronson");
MODULE_DESCRIPTION("ALSA SoC OMAP3 csb740");
MODULE_LICENSE("GPL");