path: root/Documentation
diff options
authorRoger Lucas <vt8231@hiddenengine.co.uk>2015-05-12 22:01:37 +0100
committerJean Delvare <jdelvare@suse.de>2015-07-03 14:39:05 +0200
commitf617f7310cfdca5245a10629979d85682323f1a4 (patch)
tree1eaaffb7cc024f7ad86e98cd54489b54dfe6702e /Documentation
parent9bdc771f2c29a11920f477fba05a58e23ee42554 (diff)
hwmon: (w83792d) Additional PWM outputs support
Add pwm[4-7] and the associated pwm[4-7]_mode attributes. Signed-off-by: Roger Lucas <vt8231@hiddenengine.co.uk> Signed-off-by: Jean Delvare <jdelvare@suse.de>
Diffstat (limited to 'Documentation')
1 files changed, 13 insertions, 5 deletions
diff --git a/Documentation/hwmon/w83792d b/Documentation/hwmon/w83792d
index 53f7b6866fec..f2ffc402ea45 100644
--- a/Documentation/hwmon/w83792d
+++ b/Documentation/hwmon/w83792d
@@ -8,6 +8,7 @@ Supported chips:
Datasheet: http://www.winbond.com.tw
Author: Shane Huang (Winbond)
+Updated: Roger Lucas
Module Parameters
@@ -38,9 +39,16 @@ 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.
+The driver also implements up to seven fan control outputs: pwm1-7. Pwm1-7
+can be configured to PWM output or Analogue DC output via their associated
+pwmX_mode. Outputs pwm4 through pwm7 may or may not be present depending on
+how the W83792AD/D was configured by the BIOS.
+Automatic fan control mode is possible only for fan1-fan3.
+For all pwmX outputs, a value of 0 means minimum fan speed and a value of
+255 means maximum fan speed.
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
@@ -157,14 +165,14 @@ for each fan.
/sys files
-pwm[1-3] - this file stores PWM duty cycle or DC value (fan speed) in range:
+pwm[1-7] - 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
+pwm[1-7]_mode - Select PWM or DC mode
* 0 DC
* 1 PWM
thermal_cruise[1-3] - Selects the desired temperature for cruise (degC)