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  4. i2c_smbus_read_i2c_block_data_or_emulated(9)

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I2C_SMBUS_READ_I2C_B(9) I2C and SMBus Subsystem I2C_SMBUS_READ_I2C_B(9)

NAME

i2c_smbus_read_i2c_block_data_or_emulated - read block or emulate

SYNOPSIS

s32 i2c_smbus_read_i2c_block_data_or_emulated(const struct i2c_client * client, u8 command, u8 length, u8 * values);

ARGUMENTS

client

Handle to slave device

command

Byte interpreted by slave

length

Size of data block; SMBus allows at most I2C_SMBUS_BLOCK_MAX bytes

values

Byte array into which data will be read; big enough to hold the data returned by the slave. SMBus allows at most I2C_SMBUS_BLOCK_MAX bytes.

DESCRIPTION

This executes the SMBus “block read” protocol if supported by the adapter. If block read is not supported, it emulates it using either word or byte read protocols depending on availability.

The addresses of the I2C slave device that are accessed with this function must be mapped to a linear region, so that a block read will have the same effect as a byte read. Before using this function you must double-check if the I2C slave does support exchanging a block transfer with a byte transfer.

COPYRIGHT

June 2024 Kernel Hackers Manual 3.10