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