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ccf988b6 | 1 | ========================== |
b9cdad74 | 2 | Kernel driver i2c-taos-evm |
ccf988b6 | 3 | ========================== |
b9cdad74 | 4 | |
7c81c60f | 5 | Author: Jean Delvare <jdelvare@suse.de> |
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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 | |
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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. |