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-rw-r--r--sound/soc/fsl/fsl_utils.c27
-rw-r--r--sound/soc/fsl/fsl_utils.h4
2 files changed, 30 insertions, 1 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");
diff --git a/sound/soc/fsl/fsl_utils.h b/sound/soc/fsl/fsl_utils.h
index b2951126527c..df535db40313 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 */