smdk_wm8580.c

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/*
 *  smdk_wm8580.c
 *
 *  Copyright (c) 2009 Samsung Electronics Co. Ltd
 *  Author: Jaswinder Singh <[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 <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_format(params)) {
    case SNDRV_PCM_FORMAT_U8:
    case SNDRV_PCM_FORMAT_S8:
        bfs = 16;
        break;
    case SNDRV_PCM_FORMAT_U16_LE:
    case SNDRV_PCM_FORMAT_S16_LE:
        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-audio",
        .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-audio",
        .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.x",
        .codec_dai_name = "wm8580-hifi-playback",
        .platform_name = "samsung-audio",
        .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;
        /* Secondary is at offset SAMSUNG_I2S_SECOFF from Primary */
        str = (char *)smdk_dai[SEC_PLAYBACK].cpu_dai_name;
        str[strlen(str) - 1] = '0' + SAMSUNG_I2S_SECOFF;
    } 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, [email protected]");
MODULE_DESCRIPTION("ALSA SoC SMDK WM8580");
MODULE_LICENSE("GPL");