projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
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|---|---|---|
| c3bc4cae BG |
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 |