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>

2 files changed, 13 insertions, 3 deletions

diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 365e0df3646b..89cb34d5b0ba 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 139d49d2f078..d73eceaa7afb 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 */