i2c: Add support for device alias names

Based on earlier work by Jon Smirl and Jochen Friedrich.

This patch allows new-style i2c chip drivers to have alias names using
the official kernel aliasing system and MODULE_DEVICE_TABLE(). At this
point, the old i2c driver binding scheme (driver_name/type) is still
supported.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Jochen Friedrich <jochen@scram.de>
Cc: Jon Smirl <jonsmirl@gmail.com>
Cc: Kay Sievers <kay.sievers@vrfy.org>

5 files changed, 18 insertions, 6 deletions

diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 365e0df..89cb34d 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -126,7 +126,7 @@ struct i2c_driver {
 	 * With the driver model, device enumeration is NEVER done by drivers;
 	 * it's done by infrastructure.  (NEW STYLE DRIVERS ONLY)
 	 */
-	int (*probe)(struct i2c_client *);
+	int (*probe)(struct i2c_client *, const struct i2c_device_id *);
 	int (*remove)(struct i2c_client *);
 
 	/* driver model interfaces that don't relate to enumeration  */
@@ -140,11 +140,10 @@ struct i2c_driver {
 	int (*command)(struct i2c_client *client,unsigned int cmd, void *arg);
 
 	struct device_driver driver;
+	const struct i2c_device_id *id_table;
 };
 #define to_i2c_driver(d) container_of(d, struct i2c_driver, driver)
 
-#define I2C_NAME_SIZE	20
-
 /**
  * struct i2c_client - represent an I2C slave device
  * @flags: I2C_CLIENT_TEN indicates the device uses a ten bit chip address;
diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
index 139d49d..d73ecea 100644
--- a/include/linux/mod_devicetable.h
+++ b/include/linux/mod_devicetable.h
@@ -368,4 +368,15 @@ struct virtio_device_id {
 };
 #define VIRTIO_DEV_ANY_ID	0xffffffff
 
+/* i2c */
+
+#define I2C_NAME_SIZE	20
+#define I2C_MODULE_PREFIX "i2c:"
+
+struct i2c_device_id {
+	char name[I2C_NAME_SIZE];
+	kernel_ulong_t driver_data;	/* Data private to the driver */
+};
+
+
 #endif /* LINUX_MOD_DEVICETABLE_H */
diff --git a/include/media/v4l2-common.h b/include/media/v4l2-common.h
index 316a584..020d057 100644
--- a/include/media/v4l2-common.h
+++ b/include/media/v4l2-common.h
@@ -107,9 +107,11 @@ int v4l2_chip_match_host(u32 id_type, u32 chip_id);
 struct i2c_driver;
 struct i2c_adapter;
 struct i2c_client;
+struct i2c_device_id;
 
 int v4l2_i2c_attach(struct i2c_adapter *adapter, int address, struct i2c_driver *driver,
-		const char *name, int (*probe)(struct i2c_client *));
+		const char *name,
+		int (*probe)(struct i2c_client *, const struct i2c_device_id *));
 
 /* ------------------------------------------------------------------------- */
 
diff --git a/include/media/v4l2-i2c-drv-legacy.h b/include/media/v4l2-i2c-drv-legacy.h
index e764557..347b6f8 100644
--- a/include/media/v4l2-i2c-drv-legacy.h
+++ b/include/media/v4l2-i2c-drv-legacy.h
@@ -25,7 +25,7 @@ struct v4l2_i2c_driver_data {
 	const char * const name;
 	int driverid;
 	int (*command)(struct i2c_client *client, unsigned int cmd, void *arg);
-	int (*probe)(struct i2c_client *client);
+	int (*probe)(struct i2c_client *client, const struct i2c_device_id *id);
 	int (*remove)(struct i2c_client *client);
 	int (*suspend)(struct i2c_client *client, pm_message_t state);
 	int (*resume)(struct i2c_client *client);
diff --git a/include/media/v4l2-i2c-drv.h b/include/media/v4l2-i2c-drv.h
index 9e4bab2..7b6f06b 100644
--- a/include/media/v4l2-i2c-drv.h
+++ b/include/media/v4l2-i2c-drv.h
@@ -30,7 +30,7 @@ struct v4l2_i2c_driver_data {
 	const char * const name;
 	int driverid;
 	int (*command)(struct i2c_client *client, unsigned int cmd, void *arg);
-	int (*probe)(struct i2c_client *client);
+	int (*probe)(struct i2c_client *client, const struct i2c_device_id *id);
 	int (*remove)(struct i2c_client *client);
 	int (*suspend)(struct i2c_client *client, pm_message_t state);
 	int (*resume)(struct i2c_client *client);