Kernel driver w83791d ===================== Supported chips: * Winbond W83791D Prefix: 'w83791d' Addresses scanned: I2C 0x2c - 0x2f Datasheet: http://www.winbond-usa.com/products/winbond_products/pdfs/PCIC/W83791Da.pdf Author: Charles Spirakis This driver was derived from the w83781d.c and w83792d.c source files. Credits: w83781d.c: Frodo Looijaard , Philip Edelbrock , and Mark Studebaker w83792d.c: Chunhao Huang , Rudolf Marek Module Parameters ----------------- * init boolean (default 0) Use 'init=1' to have the driver do extra software initializations. The default behavior is to do the minimum initialization possible and depend on the BIOS to properly setup the chip. If you know you have a w83791d and you're having problems, try init=1 before trying reset=1. * reset boolean (default 0) Use 'reset=1' to reset the chip (via index 0x40, bit 7). The default behavior is no chip reset to preserve BIOS settings. * force_subclients=bus,caddr,saddr,saddr This is used to force the i2c addresses for subclients of a certain chip. Example usage is `force_subclients=0,0x2f,0x4a,0x4b' to force the subclients of chip 0x2f on bus 0 to i2c addresses 0x4a and 0x4b. Description ----------- This driver implements support for the Winbond W83791D chip. Detection of the chip can sometimes be foiled because it can be in an internal state that allows no clean access (Bank with ID register is not currently selected). If you know the address of the chip, use a 'force' parameter; this will put it into a more well-behaved state first. The driver implements three temperature sensors, five fan rotation speed sensors, and ten voltage sensors. Temperatures are measured in degrees Celsius and measurement resolution is 1 degC for temp1 and 0.5 degC for temp2 and temp3. An alarm is triggered when the temperature gets higher than the Overtemperature Shutdown value; it stays on until the temperature falls below the Hysteresis value. Fan rotation speeds are reported in RPM (rotations per minute). An alarm is triggered if the rotation speed has dropped below a programmable limit. Fan readings can be divided by a programmable divider (1, 2, 4, 8 for fan 1/2/3 and 1, 2, 4, 8, 16, 32, 64 or 128 for fan 4/5) to give the readings more range or accuracy. Voltage sensors (also known as IN sensors) report their values in millivolts. An alarm is triggered if the voltage has crossed a programmable minimum or maximum limit. Alarms are provided as output from a "realtime status register". The following bits are defined: bit - alarm on: 0 - Vcore 1 - VINR0 2 - +3.3VIN 3 - 5VDD 4 - temp1 5 - temp2 6 - fan1 7 - fan2 8 - +12VIN 9 - -12VIN 10 - -5VIN 11 - fan3 12 - chassis 13 - temp3 14 - VINR1 15 - reserved 16 - tart1 17 - tart2 18 - tart3 19 - VSB 20 - VBAT 21 - fan4 22 - fan5 23 - reserved When an alarm goes off, you can be warned by a beeping signal through your computer speaker. It is possible to enable all beeping globally, or only the beeping for some alarms. The driver only reads the chip values each 3 seconds; reading them more often will do no harm, but will return 'old' values. W83791D TODO: --------------- Provide a patch for per-file alarms as discussed on the mailing list Provide a patch for smart-fan control (still need appropriate motherboard/fans)