[alsa-devel] [PATCH 2/4] ASoC: fsl-utils: Add fsl_asoc_xlate_tdm_slot_mask() support.

[Xiubo Li]

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 at freescale.com>
---
 sound/soc/fsl/fsl_utils.c | 27 +++++++++++++++++++++++++++
 sound/soc/fsl/fsl_utils.h |  4 +++-
 2 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/sound/soc/fsl/fsl_utils.c b/sound/soc/fsl/fsl_utils.c
index b9e42b5..2ac7755 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 at freescale.com>");
 MODULE_DESCRIPTION("Freescale ASoC utility code");
 MODULE_LICENSE("GPL v2");
diff --git a/sound/soc/fsl/fsl_utils.h b/sound/soc/fsl/fsl_utils.h
index b295112..df535db 100644
--- a/sound/soc/fsl/fsl_utils.h
+++ b/sound/soc/fsl/fsl_utils.h
@@ -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 */
-- 
1.8.4