osk5912.c

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/*
 * osk5912.c  --  SoC audio for OSK 5912
 *
 * Copyright (C) 2008 Mistral Solutions
 *
 * Contact: Arun KS  <[email protected]>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#include <linux/clk.h>
#include <linux/platform_device.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/soc.h>

#include <asm/mach-types.h>
#include <mach/hardware.h>
#include <linux/gpio.h>
#include <linux/module.h>
#include <linux/platform_data/asoc-ti-mcbsp.h>

#include "omap-mcbsp.h"
#include "omap-pcm.h"
#include "../codecs/tlv320aic23.h"

#define CODEC_CLOCK     12000000

static struct clk *tlv320aic23_mclk;

static int osk_startup(struct snd_pcm_substream *substream)
{
    return clk_enable(tlv320aic23_mclk);
}

static void osk_shutdown(struct snd_pcm_substream *substream)
{
    clk_disable(tlv320aic23_mclk);
}

static int osk_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;
    int err;

    /* Set the codec system clock for DAC and ADC */
    err =
        snd_soc_dai_set_sysclk(codec_dai, 0, CODEC_CLOCK, SND_SOC_CLOCK_IN);

    if (err < 0) {
        printk(KERN_ERR "can't set codec system clock\n");
        return err;
    }

    return err;
}

static struct snd_soc_ops osk_ops = {
    .startup = osk_startup,
    .hw_params = osk_hw_params,
    .shutdown = osk_shutdown,
};

static const struct snd_soc_dapm_widget tlv320aic23_dapm_widgets[] = {
    SND_SOC_DAPM_HP("Headphone Jack", NULL),
    SND_SOC_DAPM_LINE("Line In", NULL),
    SND_SOC_DAPM_MIC("Mic Jack", NULL),
};

static const struct snd_soc_dapm_route audio_map[] = {
    {"Headphone Jack", NULL, "LHPOUT"},
    {"Headphone Jack", NULL, "RHPOUT"},

    {"LLINEIN", NULL, "Line In"},
    {"RLINEIN", NULL, "Line In"},

    {"MICIN", NULL, "Mic Jack"},
};

/* Digital audio interface glue - connects codec <--> CPU */
static struct snd_soc_dai_link osk_dai = {
    .name = "TLV320AIC23",
    .stream_name = "AIC23",
    .cpu_dai_name = "omap-mcbsp.1",
    .codec_dai_name = "tlv320aic23-hifi",
    .platform_name = "omap-pcm-audio",
    .codec_name = "tlv320aic23-codec",
    .dai_fmt = SND_SOC_DAIFMT_DSP_B | SND_SOC_DAIFMT_NB_NF |
           SND_SOC_DAIFMT_CBM_CFM,
    .ops = &osk_ops,
};

/* Audio machine driver */
static struct snd_soc_card snd_soc_card_osk = {
    .name = "OSK5912",
    .owner = THIS_MODULE,
    .dai_link = &osk_dai,
    .num_links = 1,

    .dapm_widgets = tlv320aic23_dapm_widgets,
    .num_dapm_widgets = ARRAY_SIZE(tlv320aic23_dapm_widgets),
    .dapm_routes = audio_map,
    .num_dapm_routes = ARRAY_SIZE(audio_map),
};

static struct platform_device *osk_snd_device;

static int __init osk_soc_init(void)
{
    int err;
    u32 curRate;
    struct device *dev;

    if (!(machine_is_omap_osk()))
        return -ENODEV;

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

    platform_set_drvdata(osk_snd_device, &snd_soc_card_osk);
    err = platform_device_add(osk_snd_device);
    if (err)
        goto err1;

    dev = &osk_snd_device->dev;

    tlv320aic23_mclk = clk_get(dev, "mclk");
    if (IS_ERR(tlv320aic23_mclk)) {
        printk(KERN_ERR "Could not get mclk clock\n");
        err = PTR_ERR(tlv320aic23_mclk);
        goto err2;
    }

    /*
     * Configure 12 MHz output on MCLK.
     */
    curRate = (uint) clk_get_rate(tlv320aic23_mclk);
    if (curRate != CODEC_CLOCK) {
        if (clk_set_rate(tlv320aic23_mclk, CODEC_CLOCK)) {
            printk(KERN_ERR "Cannot set MCLK for AIC23 CODEC\n");
            err = -ECANCELED;
            goto err3;
        }
    }

    printk(KERN_INFO "MCLK = %d [%d]\n",
           (uint) clk_get_rate(tlv320aic23_mclk), CODEC_CLOCK);

    return 0;

err3:
    clk_put(tlv320aic23_mclk);
err2:
    platform_device_del(osk_snd_device);
err1:
    platform_device_put(osk_snd_device);

    return err;

}

static void __exit osk_soc_exit(void)
{
    clk_put(tlv320aic23_mclk);
    platform_device_unregister(osk_snd_device);
}

module_init(osk_soc_init);
module_exit(osk_soc_exit);

MODULE_AUTHOR("Arun KS <[email protected]>");
MODULE_DESCRIPTION("ALSA SoC OSK 5912");
MODULE_LICENSE("GPL");