From c3bc4caedd84ad03360cb9ec04b6c44ab314588b Mon Sep 17 00:00:00 2001 From: "BGardner@Wabtec.com" Date: Fri, 3 Jun 2005 13:03:27 -0400 Subject: [PATCH] max6875: new i2c device driver This patch adds support for the MAX6875/MAX6874 chips. Signed-off-by: Ben Gardner Signed-off-by: Greg Kroah-Hartman --- Documentation/i2c/chips/max6875 | 54 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) create mode 100644 Documentation/i2c/chips/max6875 (limited to 'Documentation/i2c') diff --git a/Documentation/i2c/chips/max6875 b/Documentation/i2c/chips/max6875 new file mode 100644 index 0000000..b4fb49b --- /dev/null +++ b/Documentation/i2c/chips/max6875 @@ -0,0 +1,54 @@ +Kernel driver max6875 +===================== + +Supported chips: + * Maxim max6874, max6875 + Prefixes: 'max6875' + Addresses scanned: 0x50, 0x52 + Datasheets: + 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 a 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. + +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. + -- cgit v1.1