1 files changed, 8 insertions, 0 deletions

diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 02fc617782e..0a5da639b32 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -53,6 +53,7 @@ struct i2c_board_info;
  * on a bus (or read from them). Apart from two basic transfer functions to
  * transmit one message at a time, a more complex version can be used to
  * transmit an arbitrary number of messages without interruption.
+ * @count must be be less than 64k since msg.len is u16.
  */
 extern int i2c_master_send(struct i2c_client *client, const char *buf,
                            int count);
@@ -152,6 +153,13 @@ struct i2c_driver {
         int (*suspend)(struct i2c_client *, pm_message_t mesg);
         int (*resume)(struct i2c_client *);
 
+        /* Alert callback, for example for the SMBus alert protocol.
+         * The format and meaning of the data value depends on the protocol.
+         * For the SMBus alert protocol, there is a single bit of data passed
+         * as the alert response's low bit ("event flag").
+         */
+        void (*alert)(struct i2c_client *, unsigned int data);
+
         /* a ioctl like command that can be used to perform specific functions
          * with the device.
          */