ASoC: Add simplfied device registration for Atmel SSC devices

Since the SSC is already being registered as a device under arch and
the DMA and SSC hardware are pretty much the same provide a simplified
device registration function for the Atmel SSC which will add the
ASoC-specific devices within the ASoC code, parenting the SSC device
off the actual SSC device. Also use it in the sam9g20-ek driver.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
This commit is contained in:
Mark Brown 2010-08-18 16:29:37 +01:00
parent dad965f07b
commit abfa4eae0b
3 changed files with 62 additions and 3 deletions

View File

@ -789,13 +789,14 @@ static struct snd_soc_dai_driver atmel_ssc_dai[NUM_SSC_DEVICES] = {
static __devinit int asoc_ssc_probe(struct platform_device *pdev)
{
return snd_soc_register_dais(&pdev->dev, atmel_ssc_dai,
ARRAY_SIZE(atmel_ssc_dai));
BUG_ON(pdev->id < 0);
BUG_ON(pdev->id >= ARRAY_SIZE(atmel_ssc_dai));
return snd_soc_register_dai(&pdev->dev, &atmel_ssc_dai[pdev->id]);
}
static int __devexit asoc_ssc_remove(struct platform_device *pdev)
{
snd_soc_unregister_dais(&pdev->dev, ARRAY_SIZE(atmel_ssc_dai));
snd_soc_unregister_dai(&pdev->dev);
return 0;
}
@ -809,6 +810,56 @@ static struct platform_driver asoc_ssc_driver = {
.remove = __devexit_p(asoc_ssc_remove),
};
/**
* atmel_ssc_set_audio - Allocate the specified SSC for audio use.
*/
int atmel_ssc_set_audio(int ssc_id)
{
struct ssc_device *ssc;
static struct platform_device *dma_pdev;
struct platform_device *ssc_pdev;
int ret;
if (ssc_id < 0 || ssc_id >= ARRAY_SIZE(atmel_ssc_dai))
return -EINVAL;
/* Allocate a dummy device for DMA if we don't have one already */
if (!dma_pdev) {
dma_pdev = platform_device_alloc("atmel-pcm-audio", -1);
if (!dma_pdev)
return -ENOMEM;
ret = platform_device_add(dma_pdev);
if (ret < 0) {
platform_device_put(dma_pdev);
dma_pdev = NULL;
return ret;
}
}
ssc_pdev = platform_device_alloc("atmel-ssc-dai", ssc_id);
if (!ssc_pdev) {
ssc_free(ssc);
return -ENOMEM;
}
/* If we can grab the SSC briefly to parent the DAI device off it */
ssc = ssc_request(ssc_id);
if (IS_ERR(ssc))
pr_warn("Unable to parent ASoC SSC DAI on SSC: %ld\n",
PTR_ERR(ssc));
else
ssc_pdev->dev.parent = &(ssc->pdev->dev);
ssc_free(ssc);
ret = platform_device_add(ssc_pdev);
if (ret < 0)
platform_device_put(ssc_pdev);
return ret;
}
EXPORT_SYMBOL_GPL(atmel_ssc_set_audio);
static int __init snd_atmel_ssc_init(void)
{
return platform_driver_register(&asoc_ssc_driver);

View File

@ -117,4 +117,6 @@ struct atmel_ssc_info {
struct atmel_ssc_state ssc_state;
};
int atmel_ssc_set_audio(int ssc);
#endif /* _AT91_SSC_DAI_H */

View File

@ -205,6 +205,12 @@ static int __init at91sam9g20ek_init(void)
if (!(machine_is_at91sam9g20ek() || machine_is_at91sam9g20ek_2mmc()))
return -ENODEV;
ret = atmel_ssc_set_audio(0);
if (ret != 0) {
pr_err("Failed to set SSC 0 for audio: %d\n", ret);
return ret;
}
/*
* Codec MCLK is supplied by PCK0 - set it up.
*/