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ASoC: fsl-utils: Add fsl_asoc_xlate_tdm_slot_mask() support.

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This patch add fsl_asoc_xlate_tdm_slot_mask() support for utils.
For the some spcified DAI driver, this will be used to generate the
TDM slot TX/RX mask. And the TX/RX mask will use a 0 bit for an active
slot as default, and the default active bits are at the LSB of
the masks.

Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Xiubo Li 2014-03-21 14:17:13 +08:00 • committed by Mark Brown
parent e5c2151483
commit 82535314a9
2 changed files with 30 additions and 1 deletions
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27
sound/soc/fsl/fsl_utils.c
View file

@ -86,6 +86,33 @@ int fsl_asoc_get_dma_channel(struct device_node *ssi_np,
} }
EXPORT_SYMBOL(fsl_asoc_get_dma_channel); EXPORT_SYMBOL(fsl_asoc_get_dma_channel);
/**
* fsl_asoc_xlate_tdm_slot_mask - generate TDM slot TX/RX mask.
*
* @slots: Number of slots in use.
* @tx_mask: bitmask representing active TX slots.
* @rx_mask: bitmask representing active RX slots.
*
* This function used to generate the TDM slot TX/RX mask. And the TX/RX
* mask will use a 0 bit for an active slot as default, and the default
* active bits are at the LSB of the mask value.
*/
int fsl_asoc_xlate_tdm_slot_mask(unsigned int slots,
unsigned int *tx_mask,
unsigned int *rx_mask)
{
if (!slots)
return -EINVAL;
if (tx_mask)
*tx_mask = ~((1 << slots) - 1);
if (rx_mask)
*rx_mask = ~((1 << slots) - 1);
return 0;
}
EXPORT_SYMBOL_GPL(fsl_asoc_xlate_tdm_slot_mask);
MODULE_AUTHOR("Timur Tabi <timur@freescale.com>"); MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
MODULE_DESCRIPTION("Freescale ASoC utility code"); MODULE_DESCRIPTION("Freescale ASoC utility code");
MODULE_LICENSE("GPL v2"); MODULE_LICENSE("GPL v2");

4
sound/soc/fsl/fsl_utils.h
View file

@ -22,5 +22,7 @@ int fsl_asoc_get_dma_channel(struct device_node *ssi_np, const char *name,
struct snd_soc_dai_link *dai, struct snd_soc_dai_link *dai,
unsigned int *dma_channel_id, unsigned int *dma_channel_id,
unsigned int *dma_id); unsigned int *dma_id);
int fsl_asoc_xlate_tdm_slot_mask(unsigned int slots,
unsigned int *tx_mask,
unsigned int *rx_mask);
#endif /* _FSL_UTILS_H */ #endif /* _FSL_UTILS_H */