Hi Kumar, > What is the intended purpose of the I2C_TIMEOUT cmd? It clearly sets > the adapter timeout, I'm just trying to understand if there is a > standard usage for the adapter's timeout. An adapter's timeout is supposedly the time the adapter driver will wait for a client to answer before giving up. As far as I can see, most SMBus master drivers do *not* properly use this, ie they use a local variable instead of the i2c_adapter struct member, so you cannot use the command to change their default timeout value. Some other bus drivers (most notably all i2c-algo-bit-based ones, but also i2c-iop3xx and i2c-ibm_iic.c) do properly use the timeout member so the command should work for them. Note that I never saw the command used. Where it would make the more sense is from user-space through i2c-dev, but even then I believe that everyone is just happy with the default timeouts the bus drivers come with. Hope that helps, -- Jean Delvare http://khali.linux-fr.org/
