| Kernel driver adm1025 |
| ===================== |
| |
| Supported chips: |
| * Analog Devices ADM1025, ADM1025A |
| Prefix: 'adm1025' |
| Addresses scanned: I2C 0x2c - 0x2e |
| Datasheet: Publicly available at the Analog Devices website |
| * Philips NE1619 |
| Prefix: 'ne1619' |
| Addresses scanned: I2C 0x2c - 0x2d |
| Datasheet: Publicly available at the Philips website |
| |
| The NE1619 presents some differences with the original ADM1025: |
| * Only two possible addresses (0x2c - 0x2d). |
| * No temperature offset register, but we don't use it anyway. |
| * No INT mode for pin 16. We don't play with it anyway. |
| |
| Authors: |
| Chen-Yuan Wu <gwu@esoft.com>, |
| Jean Delvare <jdelvare@suse.de> |
| |
| Description |
| ----------- |
| |
| (This is from Analog Devices.) The ADM1025 is a complete system hardware |
| monitor for microprocessor-based systems, providing measurement and limit |
| comparison of various system parameters. Five voltage measurement inputs |
| are provided, for monitoring +2.5V, +3.3V, +5V and +12V power supplies and |
| the processor core voltage. The ADM1025 can monitor a sixth power-supply |
| voltage by measuring its own VCC. One input (two pins) is dedicated to a |
| remote temperature-sensing diode and an on-chip temperature sensor allows |
| ambient temperature to be monitored. |
| |
| One specificity of this chip is that the pin 11 can be hardwired in two |
| different manners. It can act as the +12V power-supply voltage analog |
| input, or as the a fifth digital entry for the VID reading (bit 4). It's |
| kind of strange since both are useful, and the reason for designing the |
| chip that way is obscure at least to me. The bit 5 of the configuration |
| register can be used to define how the chip is hardwired. Please note that |
| it is not a choice you have to make as the user. The choice was already |
| made by your motherboard's maker. If the configuration bit isn't set |
| properly, you'll have a wrong +12V reading or a wrong VID reading. The way |
| the driver handles that is to preserve this bit through the initialization |
| process, assuming that the BIOS set it up properly beforehand. If it turns |
| out not to be true in some cases, we'll provide a module parameter to force |
| modes. |
| |
| This driver also supports the ADM1025A, which differs from the ADM1025 |
| only in that it has "open-drain VID inputs while the ADM1025 has on-chip |
| 100k pull-ups on the VID inputs". It doesn't make any difference for us. |
