/*
 * zylonite.c  --  SoC audio for Zylonite
 *
 * Copyright 2008 Wolfson Microelectronics PLC.
 * Author: Mark Brown <broonie@opensource.wolfsonmicro.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 <linux/moduleparam.h>
#include <linux/device.h>
#include <linux/clk.h>
#include <linux/i2c.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>

#include "../codecs/wm9713.h"
#include "pxa2xx-ac97.h"
#include "pxa-ssp.h"

/*
 * There is a physical switch SW15 on the board which changes the MCLK
 * for the WM9713 between the standard AC97 master clock and the
 * output of the CLK_POUT signal from the PXA.
 */
static int clk_pout;
module_param(clk_pout, int, 0);
MODULE_PARM_DESC(clk_pout, "Use CLK_POUT as WM9713 MCLK (SW15 on board).");

static struct clk *pout;

static struct snd_soc_card zylonite;

static const struct snd_soc_dapm_widget zylonite_dapm_widgets[] = {
        SND_SOC_DAPM_HP("Headphone", NULL),
        SND_SOC_DAPM_MIC("Headset Microphone", NULL),
        SND_SOC_DAPM_MIC("Handset Microphone", NULL),
        SND_SOC_DAPM_SPK("Multiactor", NULL),
        SND_SOC_DAPM_SPK("Headset Earpiece", NULL),
};

/* Currently supported audio map */
static const struct snd_soc_dapm_route audio_map[] = {

        /* Headphone output connected to HPL/HPR */
        { "Headphone", NULL,  "HPL" },
        { "Headphone", NULL,  "HPR" },

        /* On-board earpiece */
        { "Headset Earpiece", NULL, "OUT3" },

        /* Headphone mic */
        { "MIC2A", NULL, "Mic Bias" },
        { "Mic Bias", NULL, "Headset Microphone" },

        /* On-board mic */
        { "MIC1", NULL, "Mic Bias" },
        { "Mic Bias", NULL, "Handset Microphone" },

        /* Multiactor differentially connected over SPKL/SPKR */
        { "Multiactor", NULL, "SPKL" },
        { "Multiactor", NULL, "SPKR" },
};

static int zylonite_wm9713_init(struct snd_soc_pcm_runtime *rtd)
{
        if (clk_pout)
                snd_soc_dai_set_pll(rtd->codec_dai, 0, 0,
                                    clk_get_rate(pout), 0);

        return 0;
}

static int zylonite_voice_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;
        unsigned int pll_out = 0;
        unsigned int wm9713_div = 0;
        int ret = 0;
        int rate = params_rate(params);
        int width = snd_pcm_format_physical_width(params_format(params));

        /* Only support ratios that we can generate neatly from the AC97
         * based master clock - in particular, this excludes 44.1kHz.
         * In most applications the voice DAC will be used for telephony
         * data so multiples of 8kHz will be the common case.
         */
        switch (rate) {
        case 8000:
                wm9713_div = 12;
                break;
        case 16000:
                wm9713_div = 6;
                break;
        case 48000:
                wm9713_div = 2;
                break;
        default:
                /* Don't support OSS emulation */
                return -EINVAL;
        }

        /* Add 1 to the width for the leading clock cycle */
        pll_out = rate * (width + 1) * 8;

        ret = snd_soc_dai_set_sysclk(cpu_dai, PXA_SSP_CLK_AUDIO, 0, 1);
        if (ret < 0)
                return ret;

        ret = snd_soc_dai_set_pll(cpu_dai, 0, 0, 0, pll_out);
        if (ret < 0)
                return ret;

        if (clk_pout)
                ret = snd_soc_dai_set_clkdiv(codec_dai, WM9713_PCMCLK_PLL_DIV,
                                             WM9713_PCMDIV(wm9713_div));
        else
                ret = snd_soc_dai_set_clkdiv(codec_dai, WM9713_PCMCLK_DIV,
                                             WM9713_PCMDIV(wm9713_div));
        if (ret < 0)
                return ret;

        return 0;
}

static struct snd_soc_ops zylonite_voice_ops = {
        .hw_params = zylonite_voice_hw_params,
};

static struct snd_soc_dai_link zylonite_dai[] = {
{
        .name = "AC97",
        .stream_name = "AC97 HiFi",
        .codec_name = "wm9713-codec",
        .platform_name = "pxa-pcm-audio",
        .cpu_dai_name = "pxa2xx-ac97",
        .codec_dai_name = "wm9713-hifi",
        .init = zylonite_wm9713_init,
},
{
        .name = "AC97 Aux",
        .stream_name = "AC97 Aux",
        .codec_name = "wm9713-codec",
        .platform_name = "pxa-pcm-audio",
        .cpu_dai_name = "pxa2xx-ac97-aux",
        .codec_dai_name = "wm9713-aux",
},
{
        .name = "WM9713 Voice",
        .stream_name = "WM9713 Voice",
        .codec_name = "wm9713-codec",
        .platform_name = "pxa-pcm-audio",
        .cpu_dai_name = "pxa-ssp-dai.2",
        .codec_dai_name = "wm9713-voice",
        .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
                   SND_SOC_DAIFMT_CBS_CFS,
        .ops = &zylonite_voice_ops,
},
};

static int zylonite_probe(struct snd_soc_card *card)
{
        int ret;

        if (clk_pout) {
                pout = clk_get(NULL, "CLK_POUT");
                if (IS_ERR(pout)) {
                        dev_err(card->dev, "Unable to obtain CLK_POUT: %ld\n",
                                PTR_ERR(pout));
                        return PTR_ERR(pout);
                }

                ret = clk_enable(pout);
                if (ret != 0) {
                        dev_err(card->dev, "Unable to enable CLK_POUT: %d\n",
                                ret);
                        clk_put(pout);
                        return ret;
                }

                dev_dbg(card->dev, "MCLK enabled at %luHz\n",
                        clk_get_rate(pout));
        }

        return 0;
}

static int zylonite_remove(struct snd_soc_card *card)
{
        if (clk_pout) {
                clk_disable(pout);
                clk_put(pout);
        }

        return 0;
}

static int zylonite_suspend_post(struct snd_soc_card *card)
{
        if (clk_pout)
                clk_disable(pout);

        return 0;
}

static int zylonite_resume_pre(struct snd_soc_card *card)
{
        int ret = 0;

        if (clk_pout) {
                ret = clk_enable(pout);
                if (ret != 0)
                        dev_err(card->dev, "Unable to enable CLK_POUT: %d\n",
                                ret);
        }

        return ret;
}

static struct snd_soc_card zylonite = {
        .name = "Zylonite",
        .owner = THIS_MODULE,
        .probe = &zylonite_probe,
        .remove = &zylonite_remove,
        .suspend_post = &zylonite_suspend_post,
        .resume_pre = &zylonite_resume_pre,
        .dai_link = zylonite_dai,
        .num_links = ARRAY_SIZE(zylonite_dai),

        .dapm_widgets = zylonite_dapm_widgets,
        .num_dapm_widgets = ARRAY_SIZE(zylonite_dapm_widgets),
        .dapm_routes = audio_map,
        .num_dapm_routes = ARRAY_SIZE(audio_map),
};

static struct platform_device *zylonite_snd_ac97_device;

static int __init zylonite_init(void)
{
        int ret;

        zylonite_snd_ac97_device = platform_device_alloc("soc-audio", -1);
        if (!zylonite_snd_ac97_device)
                return -ENOMEM;

        platform_set_drvdata(zylonite_snd_ac97_device, &zylonite);

        ret = platform_device_add(zylonite_snd_ac97_device);
        if (ret != 0)
                platform_device_put(zylonite_snd_ac97_device);

        return ret;
}

static void __exit zylonite_exit(void)
{
        platform_device_unregister(zylonite_snd_ac97_device);
}

module_init(zylonite_init);
module_exit(zylonite_exit);

MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
MODULE_DESCRIPTION("ALSA SoC WM9713 Zylonite");
MODULE_LICENSE("GPL");