| 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 <bezaur@gmail.com> |
| |
| This driver was derived from the w83781d.c and w83792d.c source files. |
| |
| Credits: |
| w83781d.c: |
| Frodo Looijaard <frodol@dds.nl>, |
| Philip Edelbrock <phil@netroedge.com>, |
| and Mark Studebaker <mdsxyz123@yahoo.com> |
| w83792d.c: |
| Chunhao Huang <DZShen@Winbond.com.tw>, |
| Rudolf Marek <r.marek@sh.cvut.cz> |
| |
| Additional contributors: |
| Sven Anders <anders@anduras.de> |
| |
| 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) |