[PATCHv5 5/8] i2c: Export i2c_match_id() for direct use by device drivers

[Kieran Bingham]

From: Lee Jones <lee.jones@xxxxxxxxxx>

When there was no other way to match a I2C device to driver i2c_match_id()
was exclusively used.  However, now there are other types of tables which
are commonly supplied, matching on an i2c_device_id table is used less
frequently.  Instead of _always_ calling i2c_match_id() from within the
framework, we only need to do so from drivers which have no other way of
matching.  This patch makes i2c_match_id() available to the aforementioned
device drivers.

Acked-by: Grant Likely <grant.likely@xxxxxxxxxx>
Signed-off-by: Lee Jones <lee.jones@xxxxxxxxxx>
Signed-off-by: Kieran Bingham <kieran@xxxxxxxxxxx>
Tested-by: Kieran Bingham <kieran@xxxxxxxxxxx>
---
 drivers/i2c/i2c-core.c | 3 ++-
 include/linux/i2c.h    | 2 ++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index dd5a19ee92af..64d543b041b1 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -490,7 +490,7 @@ static inline int acpi_i2c_install_space_handler(struct i2c_adapter *adapter)
 
 /* ------------------------------------------------------------------------- */
 
-static const struct i2c_device_id *i2c_match_id(const struct i2c_device_id *id,
+const struct i2c_device_id *i2c_match_id(const struct i2c_device_id *id,
 						const struct i2c_client *client)
 {
 	if (!(id && client))
@@ -503,6 +503,7 @@ static const struct i2c_device_id *i2c_match_id(const struct i2c_device_id *id,
 	}
 	return NULL;
 }
+EXPORT_SYMBOL_GPL(i2c_match_id);
 
 static int i2c_device_match(struct device *dev, struct device_driver *drv)
 {
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 547d213d2a33..e3aa3f5e59a8 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -235,6 +235,8 @@ struct i2c_client {
 
 extern struct i2c_client *i2c_verify_client(struct device *dev);
 extern struct i2c_adapter *i2c_verify_adapter(struct device *dev);
+extern const struct i2c_device_id *i2c_match_id(const struct i2c_device_id *id,
+					const struct i2c_client *client);
 
 static inline struct i2c_client *kobj_to_i2c_client(struct kobject *kobj)
 {
-- 
2.5.0