* Jean Delvare <khali at linux-fr.org> [2004-01-11 21:14:40 +0100]: > > Well, as stated above, you have to write 4 to the fan status register, > > which will in turn clear bit 2 of the fan status register. If no more > > fan status registers indicate a fan failure, the 'Global fan fault > > event' will clear too (simple OR-logic, as you mentioned above). > > Writing a 1 to the bit so that it is reset is a strange idea, isn't it? > ;) Just in case you were not entirely joking... This is a common idiom for h/w status registers: write '1' to reset and write '0' is ignored. This allows you to clear a single status bit without needing a read-modify-write, i.e. you'll not accidentally clear a status bit that was set just before your write. For sticky-status bitfields in sysfs, this idiom is still appropriate. Regards, -- Mark M. Hoffman mhoffman at lightlink.com
