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b9cdad74 JD |
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 | ||
25985edc | 16 | For additional information on TAOS products, please see |
b9cdad74 JD |
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. |