| Kernel driver i2c-taos-evm |
| |
| Author: Jean Delvare <khali@linux-fr.org> |
| |
| This is a driver for the evaluation modules for TAOS I2C/SMBus chips. |
| The modules include an SMBus master with limited capabilities, which can |
| be controlled over the serial port. Virtually all evaluation modules |
| are supported, but a few lines of code need to be added for each new |
| module to instantiate the right I2C chip on the bus. Obviously, a driver |
| for the chip in question is also needed. |
| |
| Currently supported devices are: |
| |
| * TAOS TSL2550 EVM |
| |
| For additional information on TAOS products, please see |
| http://www.taosinc.com/ |
| |
| |
| Using this driver |
| ----------------- |
| |
| In order to use this driver, you'll need the serport driver, and the |
| inputattach tool, which is part of the input-utils package. The following |
| commands will tell the kernel that you have a TAOS EVM on the first |
| serial port: |
| |
| # modprobe serport |
| # inputattach --taos-evm /dev/ttyS0 |
| |
| |
| Technical details |
| ----------------- |
| |
| Only 4 SMBus transaction types are supported by the TAOS evaluation |
| modules: |
| * Receive Byte |
| * Send Byte |
| * Read Byte |
| * Write Byte |
| |
| The communication protocol is text-based and pretty simple. It is |
| described in a PDF document on the CD which comes with the evaluation |
| module. The communication is rather slow, because the serial port has |
| to operate at 1200 bps. However, I don't think this is a big concern in |
| practice, as these modules are meant for evaluation and testing only. |
