Commit c3bc4cae authored by's avatar Committed by Greg Kroah-Hartman

[PATCH] max6875: new i2c device driver

This patch adds support for the MAX6875/MAX6874 chips.
Signed-off-by: default avatarBen Gardner <>
Signed-off-by: default avatarGreg Kroah-Hartman <>
parent 20ad93d4
Kernel driver max6875
Supported chips:
* Maxim max6874, max6875
Prefixes: 'max6875'
Addresses scanned: 0x50, 0x52
Author: Ben Gardner <>
Module Parameters
* allow_write int
Set to non-zero to enable write permission:
*0: Read only
1: Read and write
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
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.
......@@ -498,4 +498,16 @@ config SENSORS_M41T00
This driver can also be built as a module. If so, the module
will be called m41t00.
config SENSORS_MAX6875
tristate "MAXIM MAX6875 Power supply supervisor"
depends on I2C && EXPERIMENTAL
If you say yes here you get support for the MAX6875
EEPROM-Programmable, Hex/Quad, Power-Suppy Sequencers/Supervisors.
This provides a interface to program the EEPROM and reset the chip.
This driver can also be built as a module. If so, the module
will be called max6875.
......@@ -32,6 +32,7 @@ obj-$(CONFIG_SENSORS_LM87) += lm87.o
obj-$(CONFIG_SENSORS_LM90) += lm90.o
obj-$(CONFIG_SENSORS_LM92) += lm92.o
obj-$(CONFIG_SENSORS_MAX1619) += max1619.o
obj-$(CONFIG_SENSORS_MAX6875) += max6875.o
obj-$(CONFIG_SENSORS_M41T00) += m41t00.o
obj-$(CONFIG_SENSORS_PC87360) += pc87360.o
obj-$(CONFIG_SENSORS_PCF8574) += pcf8574.o
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