linux-kernel - [PATCH 2/4] soundwire: Provide build stubs for common functions

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Message-ID: <20221114102956.914468-3-ckeepax@opensource.cirrus.com>
Date:   Mon, 14 Nov 2022 10:29:54 +0000
From:   Charles Keepax <ckeepax@...nsource.cirrus.com>
To:     <vkoul@...nel.org>
CC:     <yung-chuan.liao@...ux.intel.com>,
        <pierre-louis.bossart@...ux.intel.com>, <sanyog.r.kale@...el.com>,
        <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>,
        <patches@...nsource.cirrus.com>
Subject: [PATCH 2/4] soundwire: Provide build stubs for common functions

Provide stub functions when CONFIG_SOUNDWIRE is not set for functions
that are quite likely to be used from common code on devices supporting
multiple control buses.

Signed-off-by: Charles Keepax <ckeepax@...nsource.cirrus.com>
---
 include/linux/soundwire/sdw.h | 92 +++++++++++++++++++++++++++++++----
 1 file changed, 82 insertions(+), 10 deletions(-)

diff --git a/include/linux/soundwire/sdw.h b/include/linux/soundwire/sdw.h
index 902ed46f76c80..4f80cba898f11 100644
--- a/include/linux/soundwire/sdw.h
+++ b/include/linux/soundwire/sdw.h
@@ -1021,15 +1021,8 @@ int sdw_stream_add_master(struct sdw_bus *bus,
 		struct sdw_port_config *port_config,
 		unsigned int num_ports,
 		struct sdw_stream_runtime *stream);
-int sdw_stream_add_slave(struct sdw_slave *slave,
-		struct sdw_stream_config *stream_config,
-		struct sdw_port_config *port_config,
-		unsigned int num_ports,
-		struct sdw_stream_runtime *stream);
 int sdw_stream_remove_master(struct sdw_bus *bus,
 		struct sdw_stream_runtime *stream);
-int sdw_stream_remove_slave(struct sdw_slave *slave,
-		struct sdw_stream_runtime *stream);
 int sdw_startup_stream(void *sdw_substream);
 int sdw_prepare_stream(struct sdw_stream_runtime *stream);
 int sdw_enable_stream(struct sdw_stream_runtime *stream);
@@ -1040,8 +1033,20 @@ int sdw_bus_prep_clk_stop(struct sdw_bus *bus);
 int sdw_bus_clk_stop(struct sdw_bus *bus);
 int sdw_bus_exit_clk_stop(struct sdw_bus *bus);
 
-/* messaging and data APIs */
+int sdw_compare_devid(struct sdw_slave *slave, struct sdw_slave_id id);
+void sdw_extract_slave_id(struct sdw_bus *bus, u64 addr, struct sdw_slave_id *id);
+
+#if IS_ENABLED(CONFIG_SOUNDWIRE)
 
+int sdw_stream_add_slave(struct sdw_slave *slave,
+			 struct sdw_stream_config *stream_config,
+			 struct sdw_port_config *port_config,
+			 unsigned int num_ports,
+			 struct sdw_stream_runtime *stream);
+int sdw_stream_remove_slave(struct sdw_slave *slave,
+			    struct sdw_stream_runtime *stream);
+
+/* messaging and data APIs */
 int sdw_read(struct sdw_slave *slave, u32 addr);
 int sdw_write(struct sdw_slave *slave, u32 addr, u8 value);
 int sdw_write_no_pm(struct sdw_slave *slave, u32 addr, u8 value);
@@ -1053,7 +1058,74 @@ int sdw_nwrite_no_pm(struct sdw_slave *slave, u32 addr, size_t count, const u8 *
 int sdw_update(struct sdw_slave *slave, u32 addr, u8 mask, u8 val);
 int sdw_update_no_pm(struct sdw_slave *slave, u32 addr, u8 mask, u8 val);
 
-int sdw_compare_devid(struct sdw_slave *slave, struct sdw_slave_id id);
-void sdw_extract_slave_id(struct sdw_bus *bus, u64 addr, struct sdw_slave_id *id);
+#else
+
+static inline int sdw_stream_add_slave(struct sdw_slave *slave,
+				       struct sdw_stream_config *stream_config,
+				       struct sdw_port_config *port_config,
+				       unsigned int num_ports,
+				       struct sdw_stream_runtime *stream)
+{
+	return 0;
+}
+
+static inline int sdw_stream_remove_slave(struct sdw_slave *slave,
+					  struct sdw_stream_runtime *stream)
+{
+	return 0;
+}
+
+/* messaging and data APIs */
+static inline int sdw_read(struct sdw_slave *slave, u32 addr)
+{
+	return 0;
+}
+
+static inline int sdw_write(struct sdw_slave *slave, u32 addr, u8 value)
+{
+	return 0;
+}
+
+static inline int sdw_write_no_pm(struct sdw_slave *slave, u32 addr, u8 value)
+{
+	return 0;
+}
+
+static inline int sdw_read_no_pm(struct sdw_slave *slave, u32 addr)
+{
+	return 0;
+}
+
+static inline int sdw_nread(struct sdw_slave *slave, u32 addr, size_t count, u8 *val)
+{
+	return 0;
+}
+
+static inline int sdw_nread_no_pm(struct sdw_slave *slave, u32 addr, size_t count, u8 *val)
+{
+	return 0;
+}
+
+static inline int sdw_nwrite(struct sdw_slave *slave, u32 addr, size_t count, const u8 *val)
+{
+	return 0;
+}
+
+static inline int sdw_nwrite_no_pm(struct sdw_slave *slave, u32 addr, size_t count, const u8 *val)
+{
+	return 0;
+}
+
+static inline int sdw_update(struct sdw_slave *slave, u32 addr, u8 mask, u8 val)
+{
+	return 0;
+}
+
+static inline int sdw_update_no_pm(struct sdw_slave *slave, u32 addr, u8 mask, u8 val)
+{
+	return 0;
+}
+
+#endif /* CONFIG_SOUNDWIRE */
 
 #endif /* __SOUNDWIRE_H */
-- 
2.30.2