Kernel driver max6875 ===================== Supported chips: * Maxim MAX6874, MAX6875 Prefix: 'max6875' Addresses scanned: 0x50, 0x52 Datasheet: http://pdfserv.maxim-ic.com/en/ds/MAX6874-MAX6875.pdf Author: Ben Gardner Module Parameters ----------------- * allow_write int Set to non-zero to enable write permission: *0: Read only 1: Read and write Description ----------- The Maxim MAX6875 is an EEPROM-programmable power-supply sequencer/supervisor. It provides timed outputs that can be used as a watchdog, if properly wired. It also provides 512 bytes of user EEPROM. At reset, the MAX6875 reads the configuration EEPROM into its configuration registers. The chip then begins to operate according to the values in the registers. The Maxim MAX6874 is a similar, mostly compatible device, with more intputs and outputs: vin gpi vout MAX6874 6 4 8 MAX6875 4 3 5 MAX6874 chips can have four different addresses (as opposed to only two for the MAX6875). The additional addresses (0x54 and 0x56) are not probed by this driver by default, but the probe module parameter can be used if needed. See the datasheet for details on how to program the EEPROM. Sysfs entries ------------- eeprom_user - 512 bytes of user-defined EEPROM space. Only writable if allow_write was set and register 0x43 is 0. eeprom_config - 70 bytes of config EEPROM. Note that changes will not get loaded into register space until a power cycle or device reset. reg_config - 70 bytes of register space. Any changes take affect immediately. General Remarks --------------- A typical application will require that the EEPROMs be programmed once and never altered afterwards.