projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| ccf988b6 | 1 | ========================== |
| b9cdad74 | 2 | Kernel driver i2c-taos-evm |
| ccf988b6 | 3 | ========================== |
| b9cdad74 | 4 | |
| 7c81c60f | 5 | Author: Jean Delvare <jdelvare@suse.de> |
| b9cdad74 JD |
6 | |
| 7 | This is a driver for the evaluation modules for TAOS I2C/SMBus chips. | |
| 8 | The modules include an SMBus master with limited capabilities, which can | |
| 9 | be controlled over the serial port. Virtually all evaluation modules | |
| 10 | are supported, but a few lines of code need to be added for each new | |
| 11 | module to instantiate the right I2C chip on the bus. Obviously, a driver | |
| 12 | for the chip in question is also needed. | |
| 13 | ||
| 14 | Currently supported devices are: | |
| 15 | ||
| 16 | * TAOS TSL2550 EVM | |
| 17 | ||
| 25985edc | 18 | For additional information on TAOS products, please see |
| b9cdad74 JD |
19 | http://www.taosinc.com/ |
| 20 | ||
| 21 | ||
| 22 | Using this driver | |
| 23 | ----------------- | |
| 24 | ||
| 25 | In order to use this driver, you'll need the serport driver, and the | |
| 26 | inputattach tool, which is part of the input-utils package. The following | |
| 27 | commands will tell the kernel that you have a TAOS EVM on the first | |
| ccf988b6 | 28 | serial port:: |
| b9cdad74 | 29 | |
| ccf988b6 MCC |
30 | # modprobe serport |
| 31 | # inputattach --taos-evm /dev/ttyS0 | |
| b9cdad74 JD |
32 | |
| 33 | ||
| 34 | Technical details | |
| 35 | ----------------- | |
| 36 | ||
| 37 | Only 4 SMBus transaction types are supported by the TAOS evaluation | |
| 38 | modules: | |
| 39 | * Receive Byte | |
| 40 | * Send Byte | |
| 41 | * Read Byte | |
| 42 | * Write Byte | |
| 43 | ||
| 44 | The communication protocol is text-based and pretty simple. It is | |
| 45 | described in a PDF document on the CD which comes with the evaluation | |
| 46 | module. The communication is rather slow, because the serial port has | |
| 47 | to operate at 1200 bps. However, I don't think this is a big concern in | |
| 48 | practice, as these modules are meant for evaluation and testing only. |