/*
 *  smdk_wm8994.c
 *
 *  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/clk.h>

#include <sound/soc.h>
#include <sound/soc-dapm.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>

#include "../codecs/wm8994.h"
#include "pcm.h"

 /*
  * Default CFG switch settings to use this driver:
  *	SMDKV310: CFG5-1000, CFG7-111111
  */

 /*
  * Configure audio route as :-
  * $ amixer sset 'DAC1' on,on
  * $ amixer sset 'Right Headphone Mux' 'DAC'
  * $ amixer sset 'Left Headphone Mux' 'DAC'
  * $ amixer sset 'DAC1R Mixer AIF1.1' on
  * $ amixer sset 'DAC1L Mixer AIF1.1' on
  * $ amixer sset 'IN2L' on
  * $ amixer sset 'IN2L PGA IN2LN' on
  * $ amixer sset 'MIXINL IN2L' on
  * $ amixer sset 'AIF1ADC1L Mixer ADC/DMIC' on
  * $ amixer sset 'IN2R' on
  * $ amixer sset 'IN2R PGA IN2RN' on
  * $ amixer sset 'MIXINR IN2R' on
  * $ amixer sset 'AIF1ADC1R Mixer ADC/DMIC' on
  */

/* SMDK has a 16.934MHZ crystal attached to WM8994 */
#define SMDK_WM8994_FREQ 16934000

#ifdef CONFIG_SND_SAMSUNG_PCM_USE_EPLL
static int set_epll_rate(unsigned long rate)
{
	struct clk *fout_epll;

	fout_epll = clk_get(NULL, "fout_epll");
	if (IS_ERR(fout_epll)) {
		printk(KERN_ERR "%s: failed to get fout_epll\n", __func__);
		return PTR_ERR(fout_epll);
	}

	if (rate == clk_get_rate(fout_epll))
		goto out;

	clk_set_rate(fout_epll, rate);
out:
	clk_put(fout_epll);

	return 0;
}
#endif /* CONFIG_SND_SAMSUNG_PCM_USE_EPLL */

static int smdk_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 *cpu_dai = rtd->cpu_dai;
	struct snd_soc_dai *codec_dai = rtd->codec_dai;
#ifdef CONFIG_SND_SAMSUNG_PCM_USE_EPLL
	unsigned long epll_out_rate;
#endif /* CONFIG_SND_SAMSUNG_PCM_USE_EPLL */
	int rfs, ret;

#ifdef CONFIG_SND_SAMSUNG_PCM_USE_EPLL
	switch (params_rate(params)) {
	case 8000:
	case 12000:
	case 16000:
	case 24000:
	case 32000:
	case 48000:
	case 64000:
	case 96000:
		epll_out_rate = 49152000;
		break;
	case 11025:
	case 22050:
	case 44100:
	case 88200:
		epll_out_rate = 67737600;
		break;
	default:
		printk(KERN_ERR "%s:%d Sampling Rate %u not supported!\n",
			__func__, __LINE__, params_rate(params));
		return -EINVAL;
	}
#endif /* CONFIG_SND_SAMSUNG_PCM_USE_EPLL */

	switch (params_rate(params)) {
	case 16000:
	case 22050:
	case 22025:
	case 32000:
	case 44100:
	case 48000:
	case 96000:
	case 24000:
#ifdef CONFIG_SND_SAMSUNG_PCM_USE_EPLL
			rfs = 256;
#else /* CONFIG_SND_SAMSUNG_PCM_USE_EPLL */
			rfs = 384;
#endif /* CONFIG_SND_SAMSUNG_PCM_USE_EPLL */
		break;
	case 64000:
		rfs = 384;
		break;
	case 8000:
	case 11025:
	case 12000:
			rfs = 512;
		break;
	case 88200:
		rfs = 128;
		break;
	default:
		printk(KERN_ERR "%s:%d Sampling Rate %u not supported!\n",
			__func__, __LINE__, params_rate(params));
		return -EINVAL;
	}

	/* Set the codec DAI configuration */
	ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_DSP_B
				| SND_SOC_DAIFMT_IB_NF
				| SND_SOC_DAIFMT_CBS_CFS);
	if (ret < 0)
		return ret;

	/* Set the cpu DAI configuration */
	ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_DSP_B
				| SND_SOC_DAIFMT_IB_NF
				| SND_SOC_DAIFMT_CBS_CFS);
	if (ret < 0)
		return ret;

#ifdef CONFIG_SND_SAMSUNG_PCM_USE_EPLL
	/*
	 * Samsung SoCs PCM has no MCLK(rclk) output support, so codec
	 * should have to make its own MCLK with FLL(or PLL) from other
	 * clock source.
	 */
	ret = snd_soc_dai_set_sysclk(codec_dai, WM8994_SYSCLK_FLL1,
				params_rate(params)*rfs,
				SND_SOC_CLOCK_IN);
	if (ret < 0)
		return ret;

	ret = snd_soc_dai_set_pll(codec_dai, WM8994_FLL1,
				WM8994_FLL_SRC_MCLK1,
				SMDK_WM8994_FREQ,
				params_rate(params)*rfs);
	if (ret < 0)
		return ret;
#endif /* CONFIG_SND_SAMSUNG_PCM_USE_EPLL */

	ret = snd_soc_dai_set_sysclk(codec_dai, WM8994_SYSCLK_MCLK1,
					params_rate(params)*rfs,
					SND_SOC_CLOCK_IN);
	if (ret < 0)
		return ret;

#ifdef CONFIG_SND_SAMSUNG_PCM_USE_EPLL
	/* Set EPLL clock rate */
	ret = set_epll_rate(epll_out_rate);
	if (ret < 0)
		return ret;
#endif /* CONFIG_SND_SAMSUNG_PCM_USE_EPLL */

	/* Set SCLK_DIV for making bclk */
	ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C_PCM_SCLK_PER_FS, rfs);
	if (ret < 0)
		return ret;

	return 0;
}

/*
 * SMDK WM8994 DAI operations.
 */
static struct snd_soc_ops smdk_ops = {
	.hw_params = smdk_hw_params,
};

static struct snd_soc_dai_link smdk_dai[] = {
	{ /* Primary DAI i/f */
		.name = "WM8994 AIF1",
		.stream_name = "PCM Tx/Rx",
		.cpu_dai_name = "samsung-pcm.0",
		.codec_dai_name = "wm8994-aif1",
		.platform_name = "samsung-audio",
		.codec_name = "wm8994-codec",
		.ops = &smdk_ops,
	},
};

static struct snd_soc_card smdk = {
	.name = "SMDK-PCM",
	.dai_link = smdk_dai,
	.num_links = ARRAY_SIZE(smdk_dai),
};

static struct platform_device *smdk_snd_device;

static int __init smdk_audio_init(void)
{
	int ret;

	smdk_snd_device = platform_device_alloc("soc-audio", -1);
	if (!smdk_snd_device)
		return -ENOMEM;

	platform_set_drvdata(smdk_snd_device, &smdk);

	ret = platform_device_add(smdk_snd_device);
	if (ret)
		platform_device_put(smdk_snd_device);

	return ret;
}
module_init(smdk_audio_init);

static void __exit smdk_audio_exit(void)
{
	platform_device_unregister(smdk_snd_device);
}
module_exit(smdk_audio_exit);

MODULE_DESCRIPTION("ALSA SoC SMDK WM8994");
MODULE_LICENSE("GPL");