From ee7c814762e045c39ea20f6a06523a212dde28c9 Mon Sep 17 00:00:00 2001
From: Gopikrishnaiah Anandan <agopik@codeaurora.org>
Date: Thu, 4 Jul 2013 14:29:17 -0400
Subject: [PATCH] ASoC: core: Add support for getting TX and RX channels

Based on which codec dai is selected, slimbus channel numbers
have to be queried when use case is being enabled.
Change adds support to get the channel numbers.

Signed-off-by: Gopikrishnaiah Anandan <agopik@codeaurora.org>
---
 include/sound/soc-dai.h |  9 +++++++++
 sound/soc/soc-core.c    | 23 +++++++++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/include/sound/soc-dai.h b/include/sound/soc-dai.h
index ae9a227d35d..a0cb84c815b 100644
--- a/include/sound/soc-dai.h
+++ b/include/sound/soc-dai.h
@@ -121,6 +121,11 @@ int snd_soc_dai_set_tristate(struct snd_soc_dai *dai, int tristate);
 int snd_soc_dai_digital_mute(struct snd_soc_dai *dai, int mute,
 			     int direction);
 
+int snd_soc_dai_get_channel_map(struct snd_soc_dai *dai,
+	unsigned int *tx_num, unsigned int *tx_slot,
+	unsigned int *rx_num, unsigned int *rx_slot);
+
+
 struct snd_soc_dai_ops {
 	/*
 	 * DAI clocking configuration, all optional.
@@ -144,6 +149,10 @@ struct snd_soc_dai_ops {
 		unsigned int tx_num, unsigned int *tx_slot,
 		unsigned int rx_num, unsigned int *rx_slot);
 	int (*set_tristate)(struct snd_soc_dai *dai, int tristate);
+	int (*get_channel_map)(struct snd_soc_dai *dai,
+		unsigned int *tx_num, unsigned int *tx_slot,
+		unsigned int *rx_num, unsigned int *rx_slot);
+
 
 	/*
 	 * DAI digital mute - optional.
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index de8c895add2..c5e127ef83a 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -4499,6 +4499,29 @@ int snd_soc_info_multi_ext(struct snd_kcontrol *kcontrol,
 	return 0;
 }
 EXPORT_SYMBOL_GPL(snd_soc_info_multi_ext);
+/**
+ * snd_soc_dai_get_channel_map - configure DAI audio channel map
+ * @dai: DAI
+ * @tx_num: how many TX channels
+ * @tx_slot: pointer to an array which imply the TX slot number channel
+ *           0~num-1 uses
+ * @rx_num: how many RX channels
+ * @rx_slot: pointer to an array which imply the RX slot number channel
+ *           0~num-1 uses
+ *
+ * configure the relationship between channel number and TDM slot number.
+ */
+int snd_soc_dai_get_channel_map(struct snd_soc_dai *dai,
+	unsigned int *tx_num, unsigned int *tx_slot,
+	unsigned int *rx_num, unsigned int *rx_slot)
+{
+	if (dai->driver && dai->driver->ops->get_channel_map)
+		return dai->driver->ops->get_channel_map(dai, tx_num, tx_slot,
+			rx_num, rx_slot);
+	else
+		return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(snd_soc_dai_get_channel_map);
 static int __init snd_soc_init(void)
 {
 #ifdef CONFIG_DEBUG_FS