I2C_SMBUS_READ_BLOCK(9) I2C and SMBus Subsystem I2C_SMBUS_READ_BLOCK(9)NAMEi2c_smbus_read_block_data - SMBus “block read” protocol
SYNOPSIS
s32 i2c_smbus_read_block_data(struct i2c_client * client, u8 command,
u8 * values);
ARGUMENTS
client
Handle to slave device
command
Byte interpreted by slave
values
Byte array into which data will be read; big enough to hold the
data returned by the slave. SMBus allows at most 32 bytes.
DESCRIPTION
This executes the SMBus “block read” protocol, returning negative errno
else the number of data bytes in the slave´s response.
Note that using this function requires that the client´s adapter
support the I2C_FUNC_SMBUS_READ_BLOCK_DATA functionality. Not all
adapter drivers support this; its emulation through I2C messaging
relies on a specific mechanism (I2C_M_RECV_LEN) which may not be
implemented.
COPYRIGHTKernel Hackers Manual 2.6. November 2013 I2C_SMBUS_READ_BLOCK(9)