Olivier Hochreutiner wrote: > Hi there, > > I have been using the LM93 kernel driver and I noticed that 'gpio' > file in sysfs is read-only and that the GPIO pins of the LM93 chip can > be used as input only. > I attached a patch that allows to also use GPIO pins as output, by > simply writing to 'gpio' in sysfs. The patch is against the current > git revision of the mainstream kernel. > I did not handle the case where the GPIO pins are used as inputs after > being used as output (in which case, according to the datasheet, 0s > should be written to the GPO register, and thus 1s should be written > to the 'gpio' sysfs file). Also, if some pins are used as inputs and > others as outputs, then, when writing to the 'gpio' file in sysfs, the > pins used as inputs should be set to 1 (so that the corresponding bits > in the GPO register are set to 0). > > Comments are welcome. IMO gpiolib would be better and more generic solution instead of creating some custom sysfs entry... > Best regards, > > Olivier Hochreutiner > > > ------------------------------------------------------------------------ > > _______________________________________________ > lm-sensors mailing list > lm-sensors at lm-sensors.org > http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
