static void gl518_init_client(struct i2c_client *client);
static int gl518_remove(struct i2c_client *client);
static int gl518_read_value(struct i2c_client *client, u8 reg);
static void gl518_init_client(struct i2c_client *client);
static int gl518_remove(struct i2c_client *client);
static int gl518_read_value(struct i2c_client *client, u8 reg);