| 1 | Kernel driver `lm92.o' |
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| 2 | ====================== |
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| 3 | |
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| 4 | Status: Complete and somewhat tested |
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| 5 | |
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| 6 | Supported chips: |
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| 7 | * National Semiconductor LM92 |
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| 8 | Prefix: 'lm92' |
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| 9 | Addresses scanned: I2C 0x48 - 0x4b |
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| 10 | * National Semiconductor LM76 |
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| 11 | Prefix: 'lm92' |
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| 12 | Addresses scanned: none, force parameter needed |
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| 13 | * Maxim MAX6633/MAX6634/MAX6635 |
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| 14 | Prefix: 'lm92' |
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| 15 | Addresses scanned: I2C 0x48 - 0x4f |
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| 16 | MAX6633 with address in 0x40 - 0x47 needs force parameter |
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| 17 | |
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| 18 | Author: Abraham van der Merwe <abraham@2d3d.co.za> |
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| 19 | |
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| 20 | License: GPL |
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| 21 | |
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| 22 | |
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| 23 | Module Parameters |
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| 24 | ----------------- |
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| 25 | |
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| 26 | * force: short array (min = 1, max = 48) |
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| 27 | List of adapter,address pairs to boldly assume to be present |
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| 28 | * force_lm92: short array (min = 1, max = 48) |
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| 29 | List of adapter,address pairs which are unquestionably assumed to contain |
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| 30 | a `lm92' chip |
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| 31 | * probe: short array (min = 1, max = 48) |
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| 32 | List of adapter,address pairs to scan additionally |
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| 33 | * probe_range: short array (min = 1, max = 48) |
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| 34 | List of adapter,start-addr,end-addr triples to scan additionally |
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| 35 | * ignore: short array (min = 1, max = 48) |
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| 36 | List of adapter,address pairs not to scan |
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| 37 | * ignore_range: short array (min = 1, max = 48) |
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| 38 | List of adapter,start-addr,end-addr triples not to scan |
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| 39 | |
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| 40 | |
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| 41 | Description |
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| 42 | ----------- |
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| 43 | |
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| 44 | This driver implements support for the National Semiconductor LM92 |
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| 45 | temperature sensor. |
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| 46 | |
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| 47 | Each LM92 temperature sensor supports a single temperature sensor. |
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| 48 | Temperatures are exported to proc in degrees Celsius * 10000 (in other |
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| 49 | words temperatures are accurate to 4 decimal places). There are alarms |
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| 50 | for high, low, and critical thresholds. There's also an hysteresis to |
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| 51 | control the thresholds for resetting alarms. |
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| 52 | |
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| 53 | At the moment the driver controls these sensors in comparator mode and the |
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| 54 | interrupt pins (INT, T_CRIT_A) are ignored. |
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| 55 | |
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| 56 | Support was added later for the LM76 and Maxim MAX6633/MAX6634/MAX6635, |
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| 57 | which are mostly compatible. They have not all been tested, so you |
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| 58 | may need to use the force parameter. |
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| 59 | |
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| 60 | |
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| 61 | Hardware Configurations |
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| 62 | ----------------------- |
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| 63 | |
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| 64 | The only thing that can be changed is enabling of the fault queue. Doing so |
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| 65 | ensures that alarms will only be triggered if 4 consecutive readings all |
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| 66 | cross the alarm thresholds. You can enable this behaviour by uncommenting |
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| 67 | the #define in the driver source, and then recompile/reinstall. |
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| 68 | |
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| 69 | |
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| 70 | Chip Features |
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| 71 | ------------- |
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| 72 | |
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| 73 | Chip 'lm92' |
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| 74 | |
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| 75 | LABEL LABEL CLASS COMPUTE CLASS MODE MAGN |
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| 76 | temp - - R- 4 |
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| 77 | temp_high temp temp RW 4 |
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| 78 | temp_low temp temp RW 4 |
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| 79 | temp_crit temp temp RW 4 |
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| 80 | temp_hyst temp temp RW 4 |
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| 81 | alarms - - R- 0 |
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| 82 | |
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| 83 | LABEL FEATURE SYMBOL SYSCTL FILE:N |
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| 84 | temp SENSORS_LM92_TEMP temp:1 |
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| 85 | temp_high SENSORS_LM92_TEMP_HIGH temp:2 |
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| 86 | temp_low SENSORS_LM92_TEMP_LOW temp:3 |
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| 87 | temp_crit SENSORS_LM92_TEMP_CRIT temp:4 |
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| 88 | temp_hyst SENSORS_LM92_TEMP_HYST temp:5 |
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| 89 | alarms SENSORS_LM92_ALARMS alarms:1 |
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