Hi David, > we're working on a robotics project, and are tryng using an i2c bus to > communicate between our microcontrollers and our mini-itx pc > (via-embedded Epia ML). > (...) > although the dev-interface file seems to be outdated (the i2c_smbus_* > "macro's" it refers to are no longer in the kernel headers, and are > now only in the lm_sensors' i2c-dev.h), Care to send a patch fixing this doc file? > my amateur reading of the > kernel source supports that this should work. However, a read call > results in errno=ENOSYS (Function not implemented), although on one > run, i actually got EPERM, and another time resulted in SEGV. ENOSYS is expected. You are trying to do raw I2C transfers while the bus driver (i2c-viapro) and underlying chip only offer SMBus transfers (that is, a subset of I2C.) It fails. I'm more concerned about EPERM and SEGV, which obviously shouldn't happen. Hard to say why this happens without the actual code though. -- Jean Delvare
