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| author | Marc Hulsman <m.hulsman@tudelft.nl> | 2008-10-17 17:51:17 +0200 |
|---|---|---|
| committer | Jean Delvare <khali@mahadeva.delvare> | 2008-10-17 17:51:17 +0200 |
| commit | 6495ce184033d5e70dfdf5bb8d149e9e02feaaa9 (patch) | |
| tree | d1d0d2f2e52363f3c416413c5e554d4e42a61b16 /Documentation | |
| parent | hwmon: (w83791d) fan 4/5 pins can also be used for gpio (diff) | |
| download | linux-6495ce184033d5e70dfdf5bb8d149e9e02feaaa9.tar.xz linux-6495ce184033d5e70dfdf5bb8d149e9e02feaaa9.zip | |
hwmon: (w83791d) add manual PWM support
Add PWM manual control.
Signed-off-by: Marc Hulsman <m.hulsman@tudelft.nl>
Acked-by: Hans de Goede <j.w.r.degoede@hhs.nl>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/hwmon/w83791d | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/Documentation/hwmon/w83791d b/Documentation/hwmon/w83791d index a67d3b7a7098..49c0e94a118c 100644 --- a/Documentation/hwmon/w83791d +++ b/Documentation/hwmon/w83791d @@ -58,29 +58,32 @@ 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. +The driver implements three temperature sensors, ten voltage sensors, +five fan rotation speed sensors and manual PWM control of each fan. 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. +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. + 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 for all fans) 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. +Each fan controlled is controlled by PWM. The PWM duty cycle can be read and +set for each fan separately. Valid values range from 0 (stop) to 255 (full). The w83791d has a global bit used to enable beeping from the speaker when an alarm is triggered as well as a bitmask to enable or disable the beep for specific alarms. You need both the global beep enable bit and the corresponding beep bit to be on for a triggered alarm to sound a beep. -The sysfs interface to the gloabal enable is via the sysfs beep_enable file. +The sysfs interface to the global enable is via the sysfs beep_enable file. This file is used for both legacy and new code. The sysfs interface to the beep bitmask has migrated from the original legacy |