linux-kernel - [PATCH v2 2/4] soundwire: bus: add sdw_slave_get_current

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Message-ID: <20250704121218.1225806-3-srinivas.kandagatla@oss.qualcomm.com>
Date: Fri,  4 Jul 2025 13:12:16 +0100
From: srinivas.kandagatla@....qualcomm.com
To: vkoul@...nel.org, broonie@...nel.org
Cc: yung-chuan.liao@...ux.intel.com, pierre-louis.bossart@...ux.dev,
        lgirdwood@...il.com, perex@...ex.cz, tiwai@...e.com,
        krzysztof.kozlowski@...aro.org, linux-kernel@...r.kernel.org,
        linux-sound@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        Srinivas Kandagatla <srinivas.kandagatla@....qualcomm.com>
Subject: [PATCH v2 2/4] soundwire: bus: add sdw_slave_get_current_bank helper

From: Srinivas Kandagatla <srinivas.kandagatla@....qualcomm.com>

There has been 2 instances of this helper in codec drivers,
it does not make sense to keep duplicating this part of code.

Lets add a helper sdw_get_current_bank() for codec drivers to use it.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@....qualcomm.com>
---
 drivers/soundwire/bus.c       | 12 ++++++++++++
 include/linux/soundwire/sdw.h |  8 ++++++++
 2 files changed, 20 insertions(+)

diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c
index 4fd5cac799c5..55c1db816534 100644
--- a/drivers/soundwire/bus.c
+++ b/drivers/soundwire/bus.c
@@ -1360,6 +1360,18 @@ int sdw_slave_get_scale_index(struct sdw_slave *slave, u8 *base)
 }
 EXPORT_SYMBOL(sdw_slave_get_scale_index);
 
+int sdw_slave_get_current_bank(struct sdw_slave *slave)
+{
+	int tmp;
+
+	tmp = sdw_read(slave, SDW_SCP_CTRL);
+	if (tmp < 0)
+		return tmp;
+
+	return FIELD_GET(SDW_SCP_STAT_CURR_BANK, tmp);
+}
+EXPORT_SYMBOL_GPL(sdw_slave_get_current_bank);
+
 static int sdw_slave_set_frequency(struct sdw_slave *slave)
 {
 	int scale_index;
diff --git a/include/linux/soundwire/sdw.h b/include/linux/soundwire/sdw.h
index 096213956d31..e6a3476bcef1 100644
--- a/include/linux/soundwire/sdw.h
+++ b/include/linux/soundwire/sdw.h
@@ -1089,6 +1089,8 @@ int sdw_stream_remove_slave(struct sdw_slave *slave,
 
 struct device *of_sdw_find_device_by_node(struct device_node *np);
 
+int sdw_slave_get_current_bank(struct sdw_slave *sdev);
+
 int sdw_slave_get_scale_index(struct sdw_slave *slave, u8 *base);
 
 /* messaging and data APIs */
@@ -1128,6 +1130,12 @@ static inline struct device *of_sdw_find_device_by_node(struct device_node *np)
 	return NULL;
 }
 
+static inline int sdw_slave_get_current_bank(struct sdw_slave *sdev)
+{
+	WARN_ONCE(1, "SoundWire API is disabled");
+	return -EINVAL;
+}
+
 /* messaging and data APIs */
 static inline int sdw_read(struct sdw_slave *slave, u32 addr)
 {
-- 
2.49.0