[..]: Data sent by I2C device, as opposed to data sent by the host adapter.
-SMBus Quick Command: i2c_smbus_write_quick()
-=============================================
+SMBus Quick Command
+===================
This sends a single bit to the device, at the place of the Rd/Wr bit.
S Addr Wr [A] Comm [A] DataLow [A] DataHigh [A] P
-SMBus Process Call
-==================
+SMBus Process Call: i2c_smbus_process_call()
+=============================================
This command selects a device register (through the Comm byte), sends
16 bits of data to it, and reads 16 bits of data in return.