/*
 *  smdk_wm8580.c
 *
 *  Copyright (c) 2009 Samsung Electronics Co. Ltd
 *  Author: Jaswinder Singh <jassisinghbrar@gmail.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.
 */

#include <linux/module.h>
#include <sound/soc.h>
#include <sound/pcm_params.h>

#include <asm/mach-types.h>

#include "../codecs/wm8580.h"
#include "i2s.h"

/*
 * Default CFG switch settings to use this driver:
 *
 *   SMDK6410: Set CFG1 1-3 Off, CFG2 1-4 On
 */

/* SMDK has a 12MHZ crystal attached to WM8580 */
#define SMDK_WM8580_FREQ 12000000

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;
        unsigned int pll_out;
        int bfs, rfs, ret;

        switch (params_width(params)) {
        case 8:
                bfs = 16;
                break;
        case 16:
                bfs = 32;
                break;
        default:
                return -EINVAL;
        }

        /* The Fvco for WM8580 PLLs must fall within [90,100]MHz.
         * This criterion can't be met if we request PLL output
         * as {8000x256, 64000x256, 11025x256}Hz.
         * As a wayout, we rather change rfs to a minimum value that
         * results in (params_rate(params) * rfs), and itself, acceptable
         * to both - the CODEC and the CPU.
         */
        switch (params_rate(params)) {
        case 16000:
        case 22050:
        case 32000:
        case 44100:
        case 48000:
        case 88200:
        case 96000:
                rfs = 256;
                break;
        case 64000:
                rfs = 384;
                break;
        case 8000:
        case 11025:
                rfs = 512;
                break;
        default:
                return -EINVAL;
        }
        pll_out = params_rate(params) * rfs;

        /* Set the Codec DAI configuration */
        ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S
                                         | SND_SOC_DAIFMT_NB_NF
                                         | SND_SOC_DAIFMT_CBM_CFM);
        if (ret < 0)
                return ret;

        /* Set the AP DAI configuration */
        ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S
                                         | SND_SOC_DAIFMT_NB_NF
                                         | SND_SOC_DAIFMT_CBM_CFM);
        if (ret < 0)
                return ret;

        /* Set WM8580 to drive MCLK from its PLLA */
        ret = snd_soc_dai_set_clkdiv(codec_dai, WM8580_MCLK,
                                        WM8580_CLKSRC_PLLA);
        if (ret < 0)
                return ret;

        ret = snd_soc_dai_set_pll(codec_dai, WM8580_PLLA, 0,
                                        SMDK_WM8580_FREQ, pll_out);
        if (ret < 0)
                return ret;

        ret = snd_soc_dai_set_sysclk(codec_dai, WM8580_CLKSRC_PLLA,
                                     pll_out, SND_SOC_CLOCK_IN);
        if (ret < 0)
                return ret;

        return 0;
}

/*
 * SMDK WM8580 DAI operations.
 */
static struct snd_soc_ops smdk_ops = {
        .hw_params = smdk_hw_params,
};

/* SMDK Playback widgets */
static const struct snd_soc_dapm_widget smdk_wm8580_dapm_widgets[] = {
        SND_SOC_DAPM_HP("Front", NULL),
        SND_SOC_DAPM_HP("Center+Sub", NULL),
        SND_SOC_DAPM_HP("Rear", NULL),

        SND_SOC_DAPM_MIC("MicIn", NULL),
        SND_SOC_DAPM_LINE("LineIn", NULL),
};

/* SMDK-PAIFTX connections */
static const struct snd_soc_dapm_route smdk_wm8580_audio_map[] = {
        /* MicIn feeds AINL */
        {"AINL", NULL, "MicIn"},

        /* LineIn feeds AINL/R */
        {"AINL", NULL, "LineIn"},
        {"AINR", NULL, "LineIn"},

        /* Front Left/Right are fed VOUT1L/R */
        {"Front", NULL, "VOUT1L"},
        {"Front", NULL, "VOUT1R"},

        /* Center/Sub are fed VOUT2L/R */
        {"Center+Sub", NULL, "VOUT2L"},
        {"Center+Sub", NULL, "VOUT2R"},

        /* Rear Left/Right are fed VOUT3L/R */
        {"Rear", NULL, "VOUT3L"},
        {"Rear", NULL, "VOUT3R"},
};

static int smdk_wm8580_init_paiftx(struct snd_soc_pcm_runtime *rtd)
{
        struct snd_soc_codec *codec = rtd->codec;
        struct snd_soc_dapm_context *dapm = &codec->dapm;

        /* Enabling the microphone requires the fitting of a 0R
         * resistor to connect the line from the microphone jack.
         */
        snd_soc_dapm_disable_pin(dapm, "MicIn");

        return 0;
}

enum {
        PRI_PLAYBACK = 0,
        PRI_CAPTURE,
        SEC_PLAYBACK,
};

static struct snd_soc_dai_link smdk_dai[] = {
        [PRI_PLAYBACK] = { /* Primary Playback i/f */
                .name = "WM8580 PAIF RX",
                .stream_name = "Playback",
                .cpu_dai_name = "samsung-i2s.0",
                .codec_dai_name = "wm8580-hifi-playback",
                .platform_name = "samsung-i2s.0",
                .codec_name = "wm8580.0-001b",
                .ops = &smdk_ops,
        },
        [PRI_CAPTURE] = { /* Primary Capture i/f */
                .name = "WM8580 PAIF TX",
                .stream_name = "Capture",
                .cpu_dai_name = "samsung-i2s.0",
                .codec_dai_name = "wm8580-hifi-capture",
                .platform_name = "samsung-i2s.0",
                .codec_name = "wm8580.0-001b",
                .init = smdk_wm8580_init_paiftx,
                .ops = &smdk_ops,
        },
        [SEC_PLAYBACK] = { /* Sec_Fifo Playback i/f */
                .name = "Sec_FIFO TX",
                .stream_name = "Playback",
                .cpu_dai_name = "samsung-i2s-sec",
                .codec_dai_name = "wm8580-hifi-playback",
                .platform_name = "samsung-i2s-sec",
                .codec_name = "wm8580.0-001b",
                .ops = &smdk_ops,
        },
};

static struct snd_soc_card smdk = {
        .name = "SMDK-I2S",
        .owner = THIS_MODULE,
        .dai_link = smdk_dai,
        .num_links = 2,

        .dapm_widgets = smdk_wm8580_dapm_widgets,
        .num_dapm_widgets = ARRAY_SIZE(smdk_wm8580_dapm_widgets),
        .dapm_routes = smdk_wm8580_audio_map,
        .num_dapm_routes = ARRAY_SIZE(smdk_wm8580_audio_map),
};

static struct platform_device *smdk_snd_device;

static int __init smdk_audio_init(void)
{
        int ret;
        char *str;

        if (machine_is_smdkc100()
                        || machine_is_smdkv210() || machine_is_smdkc110()) {
                smdk.num_links = 3;
        } else if (machine_is_smdk6410()) {
                str = (char *)smdk_dai[PRI_PLAYBACK].cpu_dai_name;
                str[strlen(str) - 1] = '2';
                str = (char *)smdk_dai[PRI_CAPTURE].cpu_dai_name;
                str[strlen(str) - 1] = '2';
        }

        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_AUTHOR("Jaswinder Singh, jassisinghbrar@gmail.com");
MODULE_DESCRIPTION("ALSA SoC SMDK WM8580");
MODULE_LICENSE("GPL");