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root/sound/arm/pxa2xx-ac97.c

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DEFINITIONS

This source file includes following definitions.
  1. pxa2xx_ac97_reset
  2. pxa2xx_ac97_pcm_startup
  3. pxa2xx_ac97_pcm_shutdown
  4. pxa2xx_ac97_pcm_prepare
  5. pxa2xx_ac97_do_suspend
  6. pxa2xx_ac97_do_resume
  7. pxa2xx_ac97_suspend
  8. pxa2xx_ac97_resume
  9. pxa2xx_ac97_probe
  10. pxa2xx_ac97_remove
  11. pxa2xx_ac97_init
  12. pxa2xx_ac97_exit

/*
 * 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/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/hardware.h>
#include <mach/pxa-regs.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

static int pxa2xx_ac97_do_suspend(struct snd_card *card, pm_message_t state)
{
        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 platform_device *dev, pm_message_t state)
{
        struct snd_card *card = platform_get_drvdata(dev);
        int ret = 0;

        if (card)
                ret = pxa2xx_ac97_do_suspend(card, PMSG_SUSPEND);

        return ret;
}

static int pxa2xx_ac97_resume(struct platform_device *dev)
{
        struct snd_card *card = platform_get_drvdata(dev);
        int ret = 0;

        if (card)
                ret = pxa2xx_ac97_do_resume(card);

        return ret;
}

#else
#define pxa2xx_ac97_suspend     NULL
#define pxa2xx_ac97_resume      NULL
#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;

        ret = -ENOMEM;
        card = snd_card_new(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
                            THIS_MODULE, 0);
        if (!card)
                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);

        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);
        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),
        .suspend        = pxa2xx_ac97_suspend,
        .resume         = pxa2xx_ac97_resume,
        .driver         = {
                .name   = "pxa2xx-ac97",
                .owner  = THIS_MODULE,
        },
};

static int __init pxa2xx_ac97_init(void)
{
        return platform_driver_register(&pxa2xx_ac97_driver);
}

static void __exit pxa2xx_ac97_exit(void)
{
        platform_driver_unregister(&pxa2xx_ac97_driver);
}

module_init(pxa2xx_ac97_init);
module_exit(pxa2xx_ac97_exit);

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

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