pxa2xx-ac97.c

Go to the documentation of this file.

/*
 * linux/sound/pxa2xx-ac97.c -- AC97 support for the Intel PXA2xx chip.
 *
 * Author:  Nicolas Pitre
 * Created: Dec 02, 2004
 * Copyright:   MontaVista Software Inc.
 *
 * 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.
 */

#include <linux/init.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>

#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/ac97_codec.h>
#include <sound/initval.h>
#include <sound/pxa2xx-lib.h>

#include <mach/regs-ac97.h>
#include <mach/audio.h>

#include "pxa2xx-pcm.h"

static void pxa2xx_ac97_reset(struct snd_ac97 *ac97)
{
    if (!pxa2xx_ac97_try_cold_reset(ac97)) {
        pxa2xx_ac97_try_warm_reset(ac97);
    }

    pxa2xx_ac97_finish_reset(ac97);
}

static struct snd_ac97_bus_ops pxa2xx_ac97_ops = {
    .read   = pxa2xx_ac97_read,
    .write  = pxa2xx_ac97_write,
    .reset  = pxa2xx_ac97_reset,
};

static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_out = {
    .name           = "AC97 PCM out",
    .dev_addr       = __PREG(PCDR),
    .drcmr          = &DRCMR(12),
    .dcmd           = DCMD_INCSRCADDR | DCMD_FLOWTRG |
                  DCMD_BURST32 | DCMD_WIDTH4,
};

static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_in = {
    .name           = "AC97 PCM in",
    .dev_addr       = __PREG(PCDR),
    .drcmr          = &DRCMR(11),
    .dcmd           = DCMD_INCTRGADDR | DCMD_FLOWSRC |
                  DCMD_BURST32 | DCMD_WIDTH4,
};

static struct snd_pcm *pxa2xx_ac97_pcm;
static struct snd_ac97 *pxa2xx_ac97_ac97;

static int pxa2xx_ac97_pcm_startup(struct snd_pcm_substream *substream)
{
    struct snd_pcm_runtime *runtime = substream->runtime;
    pxa2xx_audio_ops_t *platform_ops;
    int r;

    runtime->hw.channels_min = 2;
    runtime->hw.channels_max = 2;

    r = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
        AC97_RATES_FRONT_DAC : AC97_RATES_ADC;
    runtime->hw.rates = pxa2xx_ac97_ac97->rates[r];
    snd_pcm_limit_hw_rates(runtime);

        platform_ops = substream->pcm->card->dev->platform_data;
    if (platform_ops && platform_ops->startup)
        return platform_ops->startup(substream, platform_ops->priv);
    else
        return 0;
}

static void pxa2xx_ac97_pcm_shutdown(struct snd_pcm_substream *substream)
{
    pxa2xx_audio_ops_t *platform_ops;

        platform_ops = substream->pcm->card->dev->platform_data;
    if (platform_ops && platform_ops->shutdown)
        platform_ops->shutdown(substream, platform_ops->priv);
}

static int pxa2xx_ac97_pcm_prepare(struct snd_pcm_substream *substream)
{
    struct snd_pcm_runtime *runtime = substream->runtime;
    int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
          AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
    return snd_ac97_set_rate(pxa2xx_ac97_ac97, reg, runtime->rate);
}

static struct pxa2xx_pcm_client pxa2xx_ac97_pcm_client = {
    .playback_params    = &pxa2xx_ac97_pcm_out,
    .capture_params     = &pxa2xx_ac97_pcm_in,
    .startup        = pxa2xx_ac97_pcm_startup,
    .shutdown       = pxa2xx_ac97_pcm_shutdown,
    .prepare        = pxa2xx_ac97_pcm_prepare,
};

#ifdef CONFIG_PM_SLEEP

static int pxa2xx_ac97_do_suspend(struct snd_card *card)
{
    pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;

    snd_power_change_state(card, SNDRV_CTL_POWER_D3cold);
    snd_pcm_suspend_all(pxa2xx_ac97_pcm);
    snd_ac97_suspend(pxa2xx_ac97_ac97);
    if (platform_ops && platform_ops->suspend)
        platform_ops->suspend(platform_ops->priv);

    return pxa2xx_ac97_hw_suspend();
}

static int pxa2xx_ac97_do_resume(struct snd_card *card)
{
    pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
    int rc;

    rc = pxa2xx_ac97_hw_resume();
    if (rc)
        return rc;

    if (platform_ops && platform_ops->resume)
        platform_ops->resume(platform_ops->priv);
    snd_ac97_resume(pxa2xx_ac97_ac97);
    snd_power_change_state(card, SNDRV_CTL_POWER_D0);

    return 0;
}

static int pxa2xx_ac97_suspend(struct device *dev)
{
    struct snd_card *card = dev_get_drvdata(dev);
    int ret = 0;

    if (card)
        ret = pxa2xx_ac97_do_suspend(card);

    return ret;
}

static int pxa2xx_ac97_resume(struct device *dev)
{
    struct snd_card *card = dev_get_drvdata(dev);
    int ret = 0;

    if (card)
        ret = pxa2xx_ac97_do_resume(card);

    return ret;
}

static SIMPLE_DEV_PM_OPS(pxa2xx_ac97_pm_ops, pxa2xx_ac97_suspend, pxa2xx_ac97_resume);
#endif

static int __devinit pxa2xx_ac97_probe(struct platform_device *dev)
{
    struct snd_card *card;
    struct snd_ac97_bus *ac97_bus;
    struct snd_ac97_template ac97_template;
    int ret;
    pxa2xx_audio_ops_t *pdata = dev->dev.platform_data;

    if (dev->id >= 0) {
        dev_err(&dev->dev, "PXA2xx has only one AC97 port.\n");
        ret = -ENXIO;
        goto err_dev;
    }

    ret = snd_card_create(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
                  THIS_MODULE, 0, &card);
    if (ret < 0)
        goto err;

    card->dev = &dev->dev;
    strncpy(card->driver, dev->dev.driver->name, sizeof(card->driver));

    ret = pxa2xx_pcm_new(card, &pxa2xx_ac97_pcm_client, &pxa2xx_ac97_pcm);
    if (ret)
        goto err;

    ret = pxa2xx_ac97_hw_probe(dev);
    if (ret)
        goto err;

    ret = snd_ac97_bus(card, 0, &pxa2xx_ac97_ops, NULL, &ac97_bus);
    if (ret)
        goto err_remove;
    memset(&ac97_template, 0, sizeof(ac97_template));
    ret = snd_ac97_mixer(ac97_bus, &ac97_template, &pxa2xx_ac97_ac97);
    if (ret)
        goto err_remove;

    snprintf(card->shortname, sizeof(card->shortname),
         "%s", snd_ac97_get_short_name(pxa2xx_ac97_ac97));
    snprintf(card->longname, sizeof(card->longname),
         "%s (%s)", dev->dev.driver->name, card->mixername);

    if (pdata && pdata->codec_pdata[0])
        snd_ac97_dev_add_pdata(ac97_bus->codec[0], pdata->codec_pdata[0]);
    snd_card_set_dev(card, &dev->dev);
    ret = snd_card_register(card);
    if (ret == 0) {
        platform_set_drvdata(dev, card);
        return 0;
    }

err_remove:
    pxa2xx_ac97_hw_remove(dev);
err:
    if (card)
        snd_card_free(card);
err_dev:
    return ret;
}

static int __devexit pxa2xx_ac97_remove(struct platform_device *dev)
{
    struct snd_card *card = platform_get_drvdata(dev);

    if (card) {
        snd_card_free(card);
        platform_set_drvdata(dev, NULL);
        pxa2xx_ac97_hw_remove(dev);
    }

    return 0;
}

static struct platform_driver pxa2xx_ac97_driver = {
    .probe      = pxa2xx_ac97_probe,
    .remove     = __devexit_p(pxa2xx_ac97_remove),
    .driver     = {
        .name   = "pxa2xx-ac97",
        .owner  = THIS_MODULE,
#ifdef CONFIG_PM_SLEEP
        .pm = &pxa2xx_ac97_pm_ops,
#endif
    },
};

module_platform_driver(pxa2xx_ac97_driver);

MODULE_AUTHOR("Nicolas Pitre");
MODULE_DESCRIPTION("AC97 driver for the Intel PXA2xx chip");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:pxa2xx-ac97");