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Commit 82535314 authored by Xiubo Li's avatar Xiubo Li Committed by Mark Brown
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ASoC: fsl-utils: Add fsl_asoc_xlate_tdm_slot_mask() support. 



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: default avatarXiubo Li <Li.Xiubo@freescale.com>
Signed-off-by: default avatarMark Brown <broonie@linaro.org>
parent e5c21514

sound/soc/fsl/fsl_utils.c

+27 −0
Original line number Diff line number Diff line
@@ -86,6 +86,33 @@ int fsl_asoc_get_dma_channel(struct device_node *ssi_np, 
}

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_DESCRIPTION("Freescale ASoC utility code");

MODULE_LICENSE("GPL v2");

sound/soc/fsl/fsl_utils.h

+3 −1
Original line number Diff line number Diff line
@@ -22,5 +22,7 @@ int fsl_asoc_get_dma_channel(struct device_node *ssi_np, const char *name, 
			     struct snd_soc_dai_link *dai,

			     unsigned int *dma_channel_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 */