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Diffstat (limited to 'include/linux/i2c.h')
-rw-r--r--include/linux/i2c.h27
1 files changed, 15 insertions, 12 deletions
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 56cfe23ffb39..903576df88dc 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -57,9 +57,10 @@ struct i2c_board_info;
* 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,
+extern int i2c_master_send(const struct i2c_client *client, const char *buf,
+ int count);
+extern int i2c_master_recv(const struct i2c_client *client, char *buf,
int count);
-extern int i2c_master_recv(struct i2c_client *client, char *buf, int count);
/* Transfer num messages.
*/
@@ -78,23 +79,25 @@ extern s32 i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
/* Now follow the 'nice' access routines. These also document the calling
conventions of i2c_smbus_xfer. */
-extern s32 i2c_smbus_read_byte(struct i2c_client *client);
-extern s32 i2c_smbus_write_byte(struct i2c_client *client, u8 value);
-extern s32 i2c_smbus_read_byte_data(struct i2c_client *client, u8 command);
-extern s32 i2c_smbus_write_byte_data(struct i2c_client *client,
+extern s32 i2c_smbus_read_byte(const struct i2c_client *client);
+extern s32 i2c_smbus_write_byte(const struct i2c_client *client, u8 value);
+extern s32 i2c_smbus_read_byte_data(const struct i2c_client *client,
+ u8 command);
+extern s32 i2c_smbus_write_byte_data(const struct i2c_client *client,
u8 command, u8 value);
-extern s32 i2c_smbus_read_word_data(struct i2c_client *client, u8 command);
-extern s32 i2c_smbus_write_word_data(struct i2c_client *client,
+extern s32 i2c_smbus_read_word_data(const struct i2c_client *client,
+ u8 command);
+extern s32 i2c_smbus_write_word_data(const struct i2c_client *client,
u8 command, u16 value);
/* Returns the number of read bytes */
-extern s32 i2c_smbus_read_block_data(struct i2c_client *client,
+extern s32 i2c_smbus_read_block_data(const struct i2c_client *client,
u8 command, u8 *values);
-extern s32 i2c_smbus_write_block_data(struct i2c_client *client,
+extern s32 i2c_smbus_write_block_data(const struct i2c_client *client,
u8 command, u8 length, const u8 *values);
/* Returns the number of read bytes */
-extern s32 i2c_smbus_read_i2c_block_data(struct i2c_client *client,
+extern s32 i2c_smbus_read_i2c_block_data(const struct i2c_client *client,
u8 command, u8 length, u8 *values);
-extern s32 i2c_smbus_write_i2c_block_data(struct i2c_client *client,
+extern s32 i2c_smbus_write_i2c_block_data(const struct i2c_client *client,
u8 command, u8 length,
const u8 *values);
#endif /* I2C */