i2c_smbus_read_block_data

Langue: en

Version: June 2009 (debian - 07/07/09)

Section: 9 (Appels noyau Linux)

NAME

i2c_smbus_read_block_data - SMBus block read request

SYNOPSIS

s32 i2c_smbus_read_block_data(struct i2c_client * client, u8 command, u8 * values);

ARGUMENTS

client

Handle to slave device

command

Command byte issued to let the slave know what data should be returned

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

Returns the number of bytes read in the slave's response, else a negative number to indicate some kind of error.

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.