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1 | Kernel driver max6875 | ||
2 | ===================== | ||
3 | |||
4 | Supported chips: | ||
5 | * Maxim max6874, max6875 | ||
6 | Prefixes: 'max6875' | ||
7 | Addresses scanned: 0x50, 0x52 | ||
8 | Datasheets: | ||
9 | http://pdfserv.maxim-ic.com/en/ds/MAX6874-MAX6875.pdf | ||
10 | |||
11 | Author: Ben Gardner <bgardner@wabtec.com> | ||
12 | |||
13 | |||
14 | Module Parameters | ||
15 | ----------------- | ||
16 | |||
17 | * allow_write int | ||
18 | Set to non-zero to enable write permission: | ||
19 | *0: Read only | ||
20 | 1: Read and write | ||
21 | |||
22 | |||
23 | Description | ||
24 | ----------- | ||
25 | |||
26 | The MAXIM max6875 is a EEPROM-programmable power-supply sequencer/supervisor. | ||
27 | It provides timed outputs that can be used as a watchdog, if properly wired. | ||
28 | It also provides 512 bytes of user EEPROM. | ||
29 | |||
30 | At reset, the max6875 reads the configuration eeprom into its configuration | ||
31 | registers. The chip then begins to operate according to the values in the | ||
32 | registers. | ||
33 | |||
34 | See the datasheet for details on how to program the EEPROM. | ||
35 | |||
36 | |||
37 | Sysfs entries | ||
38 | ------------- | ||
39 | |||
40 | eeprom_user - 512 bytes of user-defined EEPROM space. Only writable if | ||
41 | allow_write was set and register 0x43 is 0. | ||
42 | |||
43 | eeprom_config - 70 bytes of config EEPROM. Note that changes will not get | ||
44 | loaded into register space until a power cycle or device reset. | ||
45 | |||
46 | reg_config - 70 bytes of register space. Any changes take affect immediately. | ||
47 | |||
48 | |||
49 | General Remarks | ||
50 | --------------- | ||
51 | |||
52 | A typical application will require that the EEPROMs be programmed once and | ||
53 | never altered afterwards. | ||
54 | |||