[PATCH v2] i2c: Add i2c_get_match_data()

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Add i2c_get_match_data() similar to of_device_get_match_data(),
so that we can optimize the driver code that uses both I2C and
DT-based matching.

Suggested-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Signed-off-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
---
v1->v2:
 * Dropped parameter const struct i2c_device_id *id and the helper function.

eg: The RTC pcf85063/isl1208 driver code can be optimized with this patch.
-       if (client->dev.of_node) {
+       if (client->dev.of_node)
                config = of_device_get_match_data(&client->dev);
-               if (!config)
-                       return -ENODEV;
-       } else {
-               enum pcf85063_type type =
-                       i2c_match_id(pcf85063_ids, client)->driver_data;
-               if (type >= PCF85063_LAST_ID)
-                       return -ENODEV;
-               config = &pcf85063_cfg[type];
-       }
+       else
+               config = i2c_get_match_data(client);
+
+       if (!config)
+               return -ENODEV;
---
 drivers/i2c/i2c-core-base.c | 14 ++++++++++++++
 include/linux/i2c.h         |  2 ++
 2 files changed, 16 insertions(+)

diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
index ae3af738b03f..8576a1647785 100644
--- a/drivers/i2c/i2c-core-base.c
+++ b/drivers/i2c/i2c-core-base.c
@@ -114,6 +114,20 @@ const struct i2c_device_id *i2c_match_id(const struct i2c_device_id *id,
 }
 EXPORT_SYMBOL_GPL(i2c_match_id);
 
+const void *i2c_get_match_data(const struct i2c_client *client)
+{
+	struct device_driver *drv = client->dev.driver;
+	struct i2c_driver *driver = to_i2c_driver(drv);
+	const struct i2c_device_id *match;
+
+	match = i2c_match_id(driver->id_table, client);
+	if (!match)
+		return NULL;
+
+	return (const void *)match->driver_data;
+}
+EXPORT_SYMBOL(i2c_get_match_data);
+
 static int i2c_device_match(struct device *dev, struct device_driver *drv)
 {
 	struct i2c_client	*client = i2c_verify_client(dev);
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 13a1ce38cb0c..3430cc2b05a6 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -367,6 +367,8 @@ struct i2c_adapter *i2c_verify_adapter(struct device *dev);
 const struct i2c_device_id *i2c_match_id(const struct i2c_device_id *id,
 					 const struct i2c_client *client);
 
+const void *i2c_get_match_data(const struct i2c_client *client);
+
 static inline struct i2c_client *kobj_to_i2c_client(struct kobject *kobj)
 {
 	struct device * const dev = kobj_to_dev(kobj);
-- 
2.25.1




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