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authorRudolf Marek <r.marek@sh.cvut.cz>2006-07-05 18:15:31 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2006-09-28 15:31:12 -0700
commit563daaf4047464eef5ffcb46194a99c1a8f2260e (patch)
tree19a4f8c8f83986b1c84a6228c9178931e2066719 /Documentation
parent08c79950a047dbaccf05d70a203db2ee75ac3bd8 (diff)
hwmon: Documentation update for w83627ehf
Add documentation for the w83627ehf hardware monitoring driver. Signed-off-by: Rudolf Marek <r.marek@sh.cvut.cz> Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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+Kernel driver w83627ehf
+=======================
+
+Supported chips:
+ * Winbond W83627EHF/EHG (ISA access ONLY)
+ Prefix: 'w83627ehf'
+ Addresses scanned: ISA address retrieved from Super I/O registers
+ Datasheet: http://www.winbond-usa.com/products/winbond_products/pdfs/PCIC/W83627EHF_%20W83627EHGb.pdf
+
+Authors:
+ Jean Delvare <khali@linux-fr.org>
+ Yuan Mu <Ymu@Winbond.com.tw>
+ Rudolf Marek <r.marek@sh.cvut.cz>
+
+Description
+-----------
+
+This driver implements support for the Winbond W83627EHF and W83627EHG
+super I/O chips. We will refer to them collectively as Winbond chips.
+
+The chips implement three temperature sensors, five fan rotation
+speed sensors, ten analog voltage sensors, alarms with beep warnings (control
+unimplemented), and some automatic fan regulation strategies (plus manual
+fan control mode).
+
+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 high limit; 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. The driver sets the most
+suitable fan divisor itself. Some fans might not be present because they
+share pins with other functions.
+
+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 driver supports automatic fan control mode known as Thermal Cruise.
+In this mode, the chip attempts to keep the measured temperature in a
+predefined temperature range. If the temperature goes out of range, fan
+is driven slower/faster to reach the predefined range again.
+
+The mode works for fan1-fan4. Mapping of temperatures to pwm outputs is as
+follows:
+
+temp1 -> pwm1
+temp2 -> pwm2
+temp3 -> pwm3
+prog -> pwm4 (the programmable setting is not supported by the driver)
+
+/sys files
+----------
+
+pwm[1-4] - this file stores PWM duty cycle or DC value (fan speed) in range:
+ 0 (stop) to 255 (full)
+
+pwm[1-4]_enable - this file controls mode of fan/temperature control:
+ * 1 Manual Mode, write to pwm file any value 0-255 (full speed)
+ * 2 Thermal Cruise
+
+Thermal Cruise mode
+-------------------
+
+If the temperature is in the range defined by:
+
+pwm[1-4]_target - set target temperature, unit millidegree Celcius
+ (range 0 - 127000)
+pwm[1-4]_tolerance - tolerance, unit millidegree Celcius (range 0 - 15000)
+
+there are no changes to fan speed. Once the temperature leaves the interval,
+fan speed increases (temp is higher) or decreases if lower than desired.
+There are defined steps and times, but not exported by the driver yet.
+
+pwm[1-4]_min_output - minimum fan speed (range 1 - 255), when the temperature
+ is below defined range.
+pwm[1-4]_stop_time - how many milliseconds [ms] must elapse to switch
+ corresponding fan off. (when the temperature was below
+ defined range).
+
+Note: last two functions are influenced by other control bits, not yet exported
+ by the driver, so a change might not have any effect.