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: Xiubo Li <Li.Xiubo@freescale.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

1 files changed, 27 insertions, 0 deletions

diff --git a/sound/soc/fsl/fsl_utils.c b/sound/soc/fsl/fsl_utils.c
index b9e42b503a37..2ac7755da876 100644
--- a/sound/soc/fsl/fsl_utils.c
+++ b/sound/soc/fsl/fsl_utils.c
@@ -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");