i2c: add helper to check if a client has a driver attached

As a preparation for an API conversion, factor out something frequently
used in the media subsystem. As an improvement, it bails out on both,
NULL and ERRPTR to handle the old and new API.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 91954324f985e8151780ab16280dcaeffdc399c7..582ef05ec07ed8fbc69e38a69c714420c72f9066 100644 (file)
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -851,6 +851,11 @@ extern void i2c_del_driver(struct i2c_driver *driver);
 #define i2c_add_driver(driver) \
        i2c_register_driver(THIS_MODULE, driver)
 
+static inline bool i2c_client_has_driver(struct i2c_client *client)
+{
+       return !IS_ERR_OR_NULL(client) && client->dev.driver;
+}
+
 /* call the i2c_client->command() of all attached clients with
  * the given arguments */
 extern void i2c_clients_command(struct i2c_adapter *adap,