/*
 * ALSA Soc PCM3008 codec support
 *
 * Author:      Hugo Villeneuve
 * Copyright (C) 2008 Lyrtech inc
 *
 * Based on AC97 Soc codec, original copyright follow:
 * Copyright 2005 Wolfson Microelectronics PLC.
 *
 *  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.
 *
 * Generic PCM3008 support.
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/gpio.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/initval.h>
#include <sound/soc.h>

#include "pcm3008.h"

#define PCM3008_VERSION "0.2"

#define PCM3008_RATES (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |    \
                       SNDRV_PCM_RATE_48000)

struct snd_soc_dai pcm3008_dai = {
        .name = "PCM3008 HiFi",
        .playback = {
                .stream_name = "PCM3008 Playback",
                .channels_min = 1,
                .channels_max = 2,
                .rates = PCM3008_RATES,
                .formats = SNDRV_PCM_FMTBIT_S16_LE,
        },
        .capture = {
                .stream_name = "PCM3008 Capture",
                .channels_min = 1,
                .channels_max = 2,
                .rates = PCM3008_RATES,
                .formats = SNDRV_PCM_FMTBIT_S16_LE,
        },
};
EXPORT_SYMBOL_GPL(pcm3008_dai);

static void pcm3008_gpio_free(struct pcm3008_setup_data *setup)
{
        gpio_free(setup->dem0_pin);
        gpio_free(setup->dem1_pin);
        gpio_free(setup->pdad_pin);
        gpio_free(setup->pdda_pin);
}

static int pcm3008_soc_probe(struct platform_device *pdev)
{
        struct snd_soc_device *socdev = platform_get_drvdata(pdev);
        struct snd_soc_codec *codec;
        struct pcm3008_setup_data *setup = socdev->codec_data;
        int ret = 0;

        printk(KERN_INFO "PCM3008 SoC Audio Codec %s\n", PCM3008_VERSION);

        socdev->card->codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
        if (!socdev->card->codec)
                return -ENOMEM;

        codec = socdev->card->codec;
        mutex_init(&codec->mutex);

        codec->name = "PCM3008";
        codec->owner = THIS_MODULE;
        codec->dai = &pcm3008_dai;
        codec->num_dai = 1;
        codec->write = NULL;
        codec->read = NULL;
        INIT_LIST_HEAD(&codec->dapm_widgets);
        INIT_LIST_HEAD(&codec->dapm_paths);

        /* Register PCMs. */
        ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
        if (ret < 0) {
                printk(KERN_ERR "pcm3008: failed to create pcms\n");
                goto pcm_err;
        }

        /* Register Card. */
        ret = snd_soc_init_card(socdev);
        if (ret < 0) {
                printk(KERN_ERR "pcm3008: failed to register card\n");
                goto card_err;
        }

        /* DEM1  DEM0  DE-EMPHASIS_MODE
         * Low   Low   De-emphasis 44.1 kHz ON
         * Low   High  De-emphasis OFF
         * High  Low   De-emphasis 48 kHz ON
         * High  High  De-emphasis 32 kHz ON
         */

        /* Configure DEM0 GPIO (turning OFF DAC De-emphasis). */
        ret = gpio_request(setup->dem0_pin, "codec_dem0");
        if (ret == 0)
                ret = gpio_direction_output(setup->dem0_pin, 1);
        if (ret != 0)
                goto gpio_err;

        /* Configure DEM1 GPIO (turning OFF DAC De-emphasis). */
        ret = gpio_request(setup->dem1_pin, "codec_dem1");
        if (ret == 0)
                ret = gpio_direction_output(setup->dem1_pin, 0);
        if (ret != 0)
                goto gpio_err;

        /* Configure PDAD GPIO. */
        ret = gpio_request(setup->pdad_pin, "codec_pdad");
        if (ret == 0)
                ret = gpio_direction_output(setup->pdad_pin, 1);
        if (ret != 0)
                goto gpio_err;

        /* Configure PDDA GPIO. */
        ret = gpio_request(setup->pdda_pin, "codec_pdda");
        if (ret == 0)
                ret = gpio_direction_output(setup->pdda_pin, 1);
        if (ret != 0)
                goto gpio_err;

        return ret;

gpio_err:
        pcm3008_gpio_free(setup);
card_err:
        snd_soc_free_pcms(socdev);
pcm_err:
        kfree(socdev->card->codec);

        return ret;
}

static int pcm3008_soc_remove(struct platform_device *pdev)
{
        struct snd_soc_device *socdev = platform_get_drvdata(pdev);
        struct snd_soc_codec *codec = socdev->card->codec;
        struct pcm3008_setup_data *setup = socdev->codec_data;

        if (!codec)
                return 0;

        pcm3008_gpio_free(setup);
        snd_soc_free_pcms(socdev);
        kfree(socdev->card->codec);

        return 0;
}

#ifdef CONFIG_PM
static int pcm3008_soc_suspend(struct platform_device *pdev, pm_message_t msg)
{
        struct snd_soc_device *socdev = platform_get_drvdata(pdev);
        struct pcm3008_setup_data *setup = socdev->codec_data;

        gpio_set_value(setup->pdad_pin, 0);
        gpio_set_value(setup->pdda_pin, 0);

        return 0;
}

static int pcm3008_soc_resume(struct platform_device *pdev)
{
        struct snd_soc_device *socdev = platform_get_drvdata(pdev);
        struct pcm3008_setup_data *setup = socdev->codec_data;

        gpio_set_value(setup->pdad_pin, 1);
        gpio_set_value(setup->pdda_pin, 1);

        return 0;
}
#else
#define pcm3008_soc_suspend NULL
#define pcm3008_soc_resume NULL
#endif

struct snd_soc_codec_device soc_codec_dev_pcm3008 = {
        .probe =        pcm3008_soc_probe,
        .remove =       pcm3008_soc_remove,
        .suspend =      pcm3008_soc_suspend,
        .resume =       pcm3008_soc_resume,
};
EXPORT_SYMBOL_GPL(soc_codec_dev_pcm3008);

static int __init pcm3008_init(void)
{
        return snd_soc_register_dai(&pcm3008_dai);
}
module_init(pcm3008_init);

static void __exit pcm3008_exit(void)
{
        snd_soc_unregister_dai(&pcm3008_dai);
}
module_exit(pcm3008_exit);

MODULE_DESCRIPTION("Soc PCM3008 driver");
MODULE_AUTHOR("Hugo Villeneuve");
MODULE_LICENSE("GPL");