path: root/Documentation/hwmon
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mode: <>2005-07-27 09:25:28 +0000
committerGreg Kroah-Hartman <>2005-09-05 09:14:14 -0700
commit1ff4e3065b41847b6fe5908b1214cb508dd49e61 (patch)
tree3e5974c1f611cd995717169a9caacb1a2f431561 /Documentation/hwmon
parentce785ab460ce8728a9daf337ba8fab3ba692b6aa (diff)
[PATCH] I2C: W83792D documentation 3/3
This patch adds documentation entry for W83792D chip. Signed-off-by: Rudolf Marek <> Signed-off-by: Greg Kroah-Hartman <>
Diffstat (limited to 'Documentation/hwmon')
1 files changed, 174 insertions, 0 deletions
diff --git a/Documentation/hwmon/w83792d b/Documentation/hwmon/w83792d
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+Kernel driver w83792d
+Supported chips:
+ * Winbond W83792D
+ Prefix: 'w83792d'
+ Addresses scanned: I2C 0x2c - 0x2f
+ Datasheet:
+Author: Chunhao Huang
+Contact: DZShen <>
+Module Parameters
+* init int
+ (default 1)
+ Use 'init=0' to bypass initializing the chip.
+ Try this if your computer crashes when you load the module.
+* 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.
+This driver implements support for the Winbond W83792AD/D.
+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, seven fan rotation speed
+sensors, nine voltage sensors, and two automatic fan regulation
+strategies called: Smart Fan I (Thermal Cruise mode) and Smart Fan II.
+Automatic fan control mode is possible only for fan1-fan3. Fan4-fan7 can run
+synchronized with selected fan (fan1-fan3). This functionality and manual PWM
+control for fan4-fan7 is not yet implemented.
+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, 16, 32, 64 or
+128) 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 "realtime status register". Following bits
+are defined:
+bit - alarm on:
+0 - in0
+1 - in1
+2 - temp1
+3 - temp2
+4 - temp3
+5 - fan1
+6 - fan2
+7 - fan3
+8 - in2
+9 - in3
+10 - in4
+11 - in5
+12 - in6
+13 - VID change
+14 - chassis
+15 - fan7
+16 - tart1
+17 - tart2
+18 - tart3
+19 - in7
+20 - in8
+21 - fan4
+22 - fan5
+23 - fan6
+Tart will be asserted while target temperature cannot be achieved after 3 minutes
+of full speed rotation of corresponding fan.
+In addition to the alarms described above, there is a CHAS alarm on the chips
+which triggers if your computer case is open (This one is latched, contrary
+to realtime alarms).
+The chips only update values each 3 seconds; reading them more often will
+do no harm, but will return 'old' values.
+Known problems:
+ - This driver is only for Winbond W83792D C version device, there
+ are also some motherboards with B version W83792D device. The
+ calculation method to in6-in7(measured value, limits) is a little
+ different between C and B version. C or B version can be identified
+ by CR[0x49h].
+ - The function of vid and vrm has not been finished, because I'm NOT
+ very familiar with them. Adding support is welcome.
+  - The function of chassis open detection needs more tests.
+ - If you have ASUS server board and chip was not found: Then you will
+ need to upgrade to latest (or beta) BIOS. If it does not help please
+ contact us.
+Fan control
+Manual mode
+Works as expected. You just need to specify desired PWM/DC value (fan speed)
+in appropriate pwm# file.
+Thermal cruise
+In this mode, W83792D provides the Smart Fan system to automatically control
+fan speed to keep the temperatures of CPU and the system within specific
+range. At first a wanted temperature and interval must be set. This is done
+via thermal_cruise# file. The tolerance# file serves to create T +- tolerance
+interval. The fan speed will be lowered as long as the current temperature
+remains below the thermal_cruise# +- tolerance# value. Once the temperature
+exceeds the high limit (T+tolerance), the fan will be turned on with a
+specific speed set by pwm# and automatically controlled its PWM duty cycle
+with the temperature varying. Three conditions may occur:
+(1) If the temperature still exceeds the high limit, PWM duty
+cycle will increase slowly.
+(2) If the temperature goes below the high limit, but still above the low
+limit (T-tolerance), the fan speed will be fixed at the current speed because
+the temperature is in the target range.
+(3) If the temperature goes below the low limit, PWM duty cycle will decrease
+slowly to 0 or a preset stop value until the temperature exceeds the low
+limit. (The preset stop value handling is not yet implemented in driver)
+Smart Fan II
+W83792D also provides a special mode for fan. Four temperature points are
+available. When related temperature sensors detects the temperature in preset
+temperature region (sf2_point@_fan# +- tolerance#) it will cause fans to run
+on programmed value from sf2_level@_fan#. You need to set four temperatures
+for each fan.
+/sys files
+pwm[1-3] - this file stores PWM duty cycle or DC value (fan speed) in range:
+ 0 (stop) to 255 (full)
+pwm[1-3]_enable - this file controls mode of fan/temperature control:
+ * 0 Disabled
+ * 1 Manual mode
+ * 2 Smart Fan II
+ * 3 Thermal Cruise
+pwm[1-3]_mode - Select PWM of DC mode
+ * 0 DC
+ * 1 PWM
+thermal_cruise[1-3] - Selects the desired temperature for cruise (degC)
+tolerance[1-3] - Value in degrees of Celsius (degC) for +- T
+sf2_point[1-4]_fan[1-3] - four temperature points for each fan for Smart Fan II
+sf2_level[1-3]_fan[1-3] - three PWM/DC levels for each fan for Smart Fan II