I2C_SMBUS_READ_BLOCK - Online Linux Manual PageSection : 9
Updated : June 2018
Source : Kernel Hackers Manual 2​.6​.
Note : I2C and SMBus Subsystem

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NAMEi2c_smbus_read_block_data − SMBus ‟block read” protocol

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SYNOPSISs32 i2c_smbus_read_block_data(struct i2c_client * client, u8 command, u8 * values);

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ARGUMENTSclient 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​.

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DESCRIPTIONThis 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​.

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