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Diffstat (limited to 'Documentation/hwmon/w83781d')
| -rw-r--r-- | Documentation/hwmon/w83781d | 41 |
1 files changed, 37 insertions, 4 deletions
diff --git a/Documentation/hwmon/w83781d b/Documentation/hwmon/w83781d index 6f800a0283e..129b0a3b555 100644 --- a/Documentation/hwmon/w83781d +++ b/Documentation/hwmon/w83781d @@ -9,7 +9,7 @@ Supported chips: * Winbond W83782D Prefix: 'w83782d' Addresses scanned: I2C 0x28 - 0x2f, ISA 0x290 (8 I/O ports) - Datasheet: http://www.winbond.com/PDF/sheet/w83782d.pdf + Datasheet: http://www.winbond.com * Winbond W83783S Prefix: 'w83783s' Addresses scanned: I2C 0x2d @@ -353,7 +353,7 @@ in6=255 # PWM -Additional info about PWM on the AS99127F (may apply to other Asus +* Additional info about PWM on the AS99127F (may apply to other Asus chips as well) by Jean Delvare as of 2004-04-09: AS99127F revision 2 seems to have two PWM registers at 0x59 and 0x5A, @@ -396,14 +396,14 @@ Please contact us if you can figure out how it is supposed to work. As long as we don't know more, the w83781d driver doesn't handle PWM on AS99127F chips at all. -Additional info about PWM on the AS99127F rev.1 by Hector Martin: +* Additional info about PWM on the AS99127F rev.1 by Hector Martin: I've been fiddling around with the (in)famous 0x59 register and found out the following values do work as a form of coarse pwm: 0x80 - seems to turn fans off after some time(1-2 minutes)... might be some form of auto-fan-control based on temp? hmm (Qfan? this mobo is an -old ASUS, it isn't marketed as Qfan. Maybe some beta pre-attemp at Qfan +old ASUS, it isn't marketed as Qfan. Maybe some beta pre-attempt at Qfan that was dropped at the BIOS) 0x81 - off 0x82 - slightly "on-ner" than off, but my fans do not get to move. I can @@ -418,3 +418,36 @@ change. My mobo is an ASUS A7V266-E. This behavior is similar to what I got with speedfan under Windows, where 0-15% would be off, 15-2x% (can't remember the exact value) would be 70% and higher would be full on. + +* Additional info about PWM on the AS99127F rev.1 from lm-sensors + ticket #2350: + +I conducted some experiment on Asus P3B-F motherboard with AS99127F +(Ver. 1). + +I confirm that 0x59 register control the CPU_Fan Header on this +motherboard, and 0x5a register control PWR_Fan. + +In order to reduce the dependency of specific fan, the measurement is +conducted with a digital scope without fan connected. I found out that +P3B-F actually output variable DC voltage on fan header center pin, +looks like PWM is filtered on this motherboard. + +Here are some of measurements: + +0x80 20 mV +0x81 20 mV +0x82 232 mV +0x83 1.2 V +0x84 2.31 V +0x85 3.44 V +0x86 4.62 V +0x87 5.81 V +0x88 7.01 V +9x89 8.22 V +0x8a 9.42 V +0x8b 10.6 V +0x8c 11.9 V +0x8d 12.4 V +0x8e 12.4 V +0x8f 12.4 V |