zylonite.c

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/*
 * zylonite.c  --  SoC audio for Zylonite
 *
 * Copyright 2008 Wolfson Microelectronics PLC.
 * Author: Mark Brown <[email protected]>
 *
 * 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)
{
    struct snd_soc_codec *codec = rtd->codec;
    struct snd_soc_dapm_context *dapm = &codec->dapm;

    if (clk_pout)
        snd_soc_dai_set_pll(rtd->codec_dai, 0, 0,
                    clk_get_rate(pout), 0);

    snd_soc_dapm_new_controls(dapm, zylonite_dapm_widgets,
                  ARRAY_SIZE(zylonite_dapm_widgets));

    snd_soc_dapm_add_routes(dapm, audio_map, ARRAY_SIZE(audio_map));

    /* Static setup for now */
    snd_soc_dapm_enable_pin(dapm, "Headphone");
    snd_soc_dapm_enable_pin(dapm, "Headset Earpiece");

    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;

    ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
        SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);
    if (ret < 0)
        return ret;

    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)
        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",
    .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),
    .owner = THIS_MODULE,
};

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 <[email protected]>");
MODULE_DESCRIPTION("ALSA SoC WM9713 Zylonite");
MODULE_LICENSE("GPL");