| R.Marek@sh.cvut.cz | 7f15b66 | 2005-05-26 12:42:19 +0000 | [diff] [blame] | 1 | Kernel driver adm1021 |
| 2 | ===================== |
| 3 | |
| 4 | Supported chips: |
| 5 | * Analog Devices ADM1021 |
| 6 | Prefix: 'adm1021' |
| 7 | Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e |
| 8 | Datasheet: Publicly available at the Analog Devices website |
| 9 | * Analog Devices ADM1021A/ADM1023 |
| 10 | Prefix: 'adm1023' |
| 11 | Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e |
| 12 | Datasheet: Publicly available at the Analog Devices website |
| 13 | * Genesys Logic GL523SM |
| 14 | Prefix: 'gl523sm' |
| 15 | Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e |
| 16 | Datasheet: |
| 17 | * Intel Xeon Processor |
| 18 | Prefix: - any other - may require 'force_adm1021' parameter |
| 19 | Addresses scanned: none |
| 20 | Datasheet: Publicly available at Intel website |
| 21 | * Maxim MAX1617 |
| 22 | Prefix: 'max1617' |
| 23 | Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e |
| 24 | Datasheet: Publicly available at the Maxim website |
| 25 | * Maxim MAX1617A |
| 26 | Prefix: 'max1617a' |
| 27 | Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e |
| 28 | Datasheet: Publicly available at the Maxim website |
| 29 | * National Semiconductor LM84 |
| 30 | Prefix: 'lm84' |
| 31 | Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e |
| 32 | Datasheet: Publicly available at the National Semiconductor website |
| 33 | * Philips NE1617 |
| 34 | Prefix: 'max1617' (probably detected as a max1617) |
| 35 | Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e |
| 36 | Datasheet: Publicly available at the Philips website |
| 37 | * Philips NE1617A |
| 38 | Prefix: 'max1617' (probably detected as a max1617) |
| 39 | Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e |
| 40 | Datasheet: Publicly available at the Philips website |
| 41 | * TI THMC10 |
| 42 | Prefix: 'thmc10' |
| 43 | Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e |
| 44 | Datasheet: Publicly available at the TI website |
| 45 | * Onsemi MC1066 |
| 46 | Prefix: 'mc1066' |
| 47 | Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e |
| 48 | Datasheet: Publicly available at the Onsemi website |
| 49 | |
| 50 | |
| 51 | Authors: |
| 52 | Frodo Looijaard <frodol@dds.nl>, |
| 53 | Philip Edelbrock <phil@netroedge.com> |
| 54 | |
| 55 | Module Parameters |
| 56 | ----------------- |
| 57 | |
| 58 | * read_only: int |
| 59 | Don't set any values, read only mode |
| 60 | |
| 61 | |
| 62 | Description |
| 63 | ----------- |
| 64 | |
| 65 | The chips supported by this driver are very similar. The Maxim MAX1617 is |
| 66 | the oldest; it has the problem that it is not very well detectable. The |
| 67 | MAX1617A solves that. The ADM1021 is a straight clone of the MAX1617A. |
| 68 | Ditto for the THMC10. From here on, we will refer to all these chips as |
| 69 | ADM1021-clones. |
| 70 | |
| 71 | The ADM1021 and MAX1617A reports a die code, which is a sort of revision |
| 72 | code. This can help us pinpoint problems; it is not very useful |
| 73 | otherwise. |
| 74 | |
| 75 | ADM1021-clones implement two temperature sensors. One of them is internal, |
| 76 | and measures the temperature of the chip itself; the other is external and |
| 77 | is realised in the form of a transistor-like device. A special alarm |
| 78 | indicates whether the remote sensor is connected. |
| 79 | |
| 80 | Each sensor has its own low and high limits. When they are crossed, the |
| 81 | corresponding alarm is set and remains on as long as the temperature stays |
| 82 | out of range. Temperatures are measured in degrees Celsius. Measurements |
| 83 | are possible between -65 and +127 degrees, with a resolution of one degree. |
| 84 | |
| 85 | If an alarm triggers, it will remain triggered until the hardware register |
| 86 | is read at least once. This means that the cause for the alarm may already |
| 87 | have disappeared! |
| 88 | |
| 89 | This driver only updates its values each 1.5 seconds; reading it more often |
| 90 | will do no harm, but will return 'old' values. It is possible to make |
| 91 | ADM1021-clones do faster measurements, but there is really no good reason |
| 92 | for that. |
| 93 | |
| 94 | Xeon support |
| 95 | ------------ |
| 96 | |
| 97 | Some Xeon processors have real max1617, adm1021, or compatible chips |
| 98 | within them, with two temperature sensors. |
| 99 | |
| 100 | Other Xeons have chips with only one sensor. |
| 101 | |
| 102 | If you have a Xeon, and the adm1021 module loads, and both temperatures |
| 103 | appear valid, then things are good. |
| 104 | |
| 105 | If the adm1021 module doesn't load, you should try this: |
| 106 | modprobe adm1021 force_adm1021=BUS,ADDRESS |
| 107 | ADDRESS can only be 0x18, 0x1a, 0x29, 0x2b, 0x4c, or 0x4e. |
| 108 | |
| 109 | If you have dual Xeons you may have appear to have two separate |
| 110 | adm1021-compatible chips, or two single-temperature sensors, at distinct |
| 111 | addresses. |