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