i2c-taos-evm.rst (1496B)
1========================== 2Kernel driver i2c-taos-evm 3========================== 4 5Author: Jean Delvare <jdelvare@suse.de> 6 7This is a driver for the evaluation modules for TAOS I2C/SMBus chips. 8The modules include an SMBus master with limited capabilities, which can 9be controlled over the serial port. Virtually all evaluation modules 10are supported, but a few lines of code need to be added for each new 11module to instantiate the right I2C chip on the bus. Obviously, a driver 12for the chip in question is also needed. 13 14Currently supported devices are: 15 16* TAOS TSL2550 EVM 17 18For additional information on TAOS products, please see 19 http://www.taosinc.com/ 20 21 22Using this driver 23----------------- 24 25In order to use this driver, you'll need the serport driver, and the 26inputattach tool, which is part of the input-utils package. The following 27commands will tell the kernel that you have a TAOS EVM on the first 28serial port:: 29 30 # modprobe serport 31 # inputattach --taos-evm /dev/ttyS0 32 33 34Technical details 35----------------- 36 37Only 4 SMBus transaction types are supported by the TAOS evaluation 38modules: 39* Receive Byte 40* Send Byte 41* Read Byte 42* Write Byte 43 44The communication protocol is text-based and pretty simple. It is 45described in a PDF document on the CD which comes with the evaluation 46module. The communication is rather slow, because the serial port has 47to operate at 1200 bps. However, I don't think this is a big concern in 48practice, as these modules are meant for evaluation and testing only.