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authorBGardner@Wabtec.com <BGardner@Wabtec.com>2005-06-03 13:03:27 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2005-06-21 21:52:05 -0700
commitc3bc4caedd84ad03360cb9ec04b6c44ab314588b (patch)
tree5ae34e8b136d2584be6d30f9203c7dba49f27663 /Documentation/i2c
parent20ad93d4e5cf5f0616198b5919ee9f304119dd4b (diff)
downloadlinux-linaro-stable-c3bc4caedd84ad03360cb9ec04b6c44ab314588b.tar.gz
[PATCH] max6875: new i2c device driver
This patch adds support for the MAX6875/MAX6874 chips. Signed-off-by: Ben Gardner <bgardner@wabtec.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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+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 <bgardner@wabtec.com>
+
+
+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.
+