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/W83791D_W83791Gb.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 Additional contributors: Sven Anders 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. The W83791G chip appears to be the same as the W83791D but is lead free. 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. The bit ordering for the alarm "realtime status register" and the "beep enable registers" are different. in0 (VCORE) : alarms: 0x000001 beep_enable: 0x000001 in1 (VINR0) : alarms: 0x000002 beep_enable: 0x002000 <== mismatch in2 (+3.3VIN): alarms: 0x000004 beep_enable: 0x000004 in3 (5VDD) : alarms: 0x000008 beep_enable: 0x000008 in4 (+12VIN) : alarms: 0x000100 beep_enable: 0x000100 in5 (-12VIN) : alarms: 0x000200 beep_enable: 0x000200 in6 (-5VIN) : alarms: 0x000400 beep_enable: 0x000400 in7 (VSB) : alarms: 0x080000 beep_enable: 0x010000 <== mismatch in8 (VBAT) : alarms: 0x100000 beep_enable: 0x020000 <== mismatch in9 (VINR1) : alarms: 0x004000 beep_enable: 0x004000 temp1 : alarms: 0x000010 beep_enable: 0x000010 temp2 : alarms: 0x000020 beep_enable: 0x000020 temp3 : alarms: 0x002000 beep_enable: 0x000002 <== mismatch fan1 : alarms: 0x000040 beep_enable: 0x000040 fan2 : alarms: 0x000080 beep_enable: 0x000080 fan3 : alarms: 0x000800 beep_enable: 0x000800 fan4 : alarms: 0x200000 beep_enable: 0x200000 fan5 : alarms: 0x400000 beep_enable: 0x400000 tart1 : alarms: 0x010000 beep_enable: 0x040000 <== mismatch tart2 : alarms: 0x020000 beep_enable: 0x080000 <== mismatch tart3 : alarms: 0x040000 beep_enable: 0x100000 <== mismatch case_open : alarms: 0x001000 beep_enable: 0x001000 user_enable : alarms: -------- beep_enable: 0x800000 *** NOTE: It is the responsibility of user-space code to handle the fact that the beep enable and alarm bits are in different positions when using that feature of the chip. 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 and beep enables as defined in the hwmon documentation (Documentation/hwmon/sysfs-interface) Provide a patch for smart-fan control (still need appropriate motherboard/fans)