2015-10-21 13:03 GMT+02:00 Peter Korsgaard <peter@xxxxxxxxxxxxx>: >>>>>> "Bartosz" == Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx> writes: > > > Chips from the at24cs EEPROM series have an additional read-only memory area > > containing a factory pre-programmed serial number. In order to access it, a > > dummy write must be executed before reading the serial number bytes. > > > This series adds support for reading the serial number through a sysfs > > attribute. > > > While we're at it: some of the patches contain readability tweaks and code > > organization fixes. > > > Tested with at24cs64 and at24cs02 chips (for both 16 and 8 bit address > > pointers). > > As the serial number is available on a separate i2c address, wouldn't > it be simpler to handle these as special (read only) device variants and > instantiate E.G. a 24c64 (for the normal data) and a 24cs64 (for the > serial)? > Hi Peter, I wanted to respond that this way we would not be protected from concurrent accesses, but then I saw I didn't actually include any locks in the serial read function - my bad. It needs to be fixed as both memory blocks share the same address pointer. I'll resend the series. Best regards, Bartosz Golaszewski -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
