i2c_smbus_read_block_data
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## 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.

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