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7f15b664 M |
1 | Kernel driver adm1025 |
2 | ===================== | |
3 | ||
4 | Supported chips: | |
b04f2f7d | 5 | |
7f15b664 | 6 | * Analog Devices ADM1025, ADM1025A |
b04f2f7d | 7 | |
7f15b664 | 8 | Prefix: 'adm1025' |
b04f2f7d | 9 | |
7f15b664 | 10 | Addresses scanned: I2C 0x2c - 0x2e |
b04f2f7d | 11 | |
7f15b664 | 12 | Datasheet: Publicly available at the Analog Devices website |
b04f2f7d | 13 | |
7f15b664 | 14 | * Philips NE1619 |
b04f2f7d | 15 | |
7f15b664 | 16 | Prefix: 'ne1619' |
b04f2f7d | 17 | |
7f15b664 | 18 | Addresses scanned: I2C 0x2c - 0x2d |
b04f2f7d | 19 | |
7f15b664 M |
20 | Datasheet: Publicly available at the Philips website |
21 | ||
22 | The NE1619 presents some differences with the original ADM1025: | |
b04f2f7d | 23 | |
7f15b664 M |
24 | * Only two possible addresses (0x2c - 0x2d). |
25 | * No temperature offset register, but we don't use it anyway. | |
26 | * No INT mode for pin 16. We don't play with it anyway. | |
27 | ||
28 | Authors: | |
b04f2f7d MCC |
29 | - Chen-Yuan Wu <gwu@esoft.com>, |
30 | - Jean Delvare <jdelvare@suse.de> | |
7f15b664 M |
31 | |
32 | Description | |
33 | ----------- | |
34 | ||
35 | (This is from Analog Devices.) The ADM1025 is a complete system hardware | |
36 | monitor for microprocessor-based systems, providing measurement and limit | |
37 | comparison of various system parameters. Five voltage measurement inputs | |
38 | are provided, for monitoring +2.5V, +3.3V, +5V and +12V power supplies and | |
39 | the processor core voltage. The ADM1025 can monitor a sixth power-supply | |
40 | voltage by measuring its own VCC. One input (two pins) is dedicated to a | |
41 | remote temperature-sensing diode and an on-chip temperature sensor allows | |
42 | ambient temperature to be monitored. | |
43 | ||
44 | One specificity of this chip is that the pin 11 can be hardwired in two | |
45 | different manners. It can act as the +12V power-supply voltage analog | |
46 | input, or as the a fifth digital entry for the VID reading (bit 4). It's | |
47 | kind of strange since both are useful, and the reason for designing the | |
48 | chip that way is obscure at least to me. The bit 5 of the configuration | |
49 | register can be used to define how the chip is hardwired. Please note that | |
50 | it is not a choice you have to make as the user. The choice was already | |
51 | made by your motherboard's maker. If the configuration bit isn't set | |
52 | properly, you'll have a wrong +12V reading or a wrong VID reading. The way | |
53 | the driver handles that is to preserve this bit through the initialization | |
54 | process, assuming that the BIOS set it up properly beforehand. If it turns | |
55 | out not to be true in some cases, we'll provide a module parameter to force | |
56 | modes. | |
57 | ||
58 | This driver also supports the ADM1025A, which differs from the ADM1025 | |
59 | only in that it has "open-drain VID inputs while the ADM1025 has on-chip | |
60 | 100k pull-ups on the VID inputs". It doesn't make any difference for us. |