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Old 01-13-2012, 12:18 AM   #1
auwerk
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How to send SMBus 2-byte command (16-bit reg address)?


Hi! I'm developing driver for sensor chip (camera), that is connected to SoC (TI DaVinci) via I2C interface. I started with reading sources of the drivers for similar devices. They all use i2c_smbus_* functions to make queries. The problem is that this functions are expecting 8-bit command (register address), but datasheet says that register address in I2C queries must be 16-bit. There's some mention of the similar thing in Kernel Documentation (for. ex.: http://git.kernel.org/?p=linux/kerne...smbus-protocol line 233), but I can not find how to use it.
Any ideas?
 
Old 01-15-2012, 10:01 AM   #2
Mara
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Look for i2c_smbus_xfer. Is it what you need?
 
Old 01-29-2012, 08:01 PM   #3
UserA
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I also faced with this problem. You should use i2c_master_send/recv only. (only for not x86 arch's)
 
  


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