[PATCH] hwmon: Sysfs interface documentation update, 1 of 2

This patch cleans up hwmon sysfs documentation file, plus introduces
the description of DC/PWM selection for fan speed control.

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>

Documentation/hwmon/sysfs-interface

@@ -69,28 +69,37 @@ to cause an alarm) is chip-dependent.
 
 -------------------------------------------------------------------------
 
+[0-*]	denotes any positive number starting from 0
+[1-*]	denotes any positive number starting from 1
+RO	read only value
+RW	read/write value
+
+Read/write values may be read-only for some chips, depending on the
+hardware implementation.
+
 ************
 * Voltages *
 ************
 
-in[0-8]_min	Voltage min value.
+in[0-*]_min	Voltage min value.
 		Unit: millivolt
-		Read/Write
+		RW
 		
-in[0-8]_max	Voltage max value.
+in[0-*]_max	Voltage max value.
 		Unit: millivolt
-		Read/Write
+		RW
 		
-in[0-8]_input	Voltage input value.
+in[0-*]_input	Voltage input value.
 		Unit: millivolt
-		Read only
+		RO
+		Voltage measured on the chip pin.
 		Actual voltage depends on the scaling resistors on the
 		motherboard, as recommended in the chip datasheet.
 		This varies by chip and by motherboard.
 		Because of this variation, values are generally NOT scaled
 		by the chip driver, and must be done by the application.
 		However, some drivers (notably lm87 and via686a)
-		do scale, with various degrees of success.
+		do scale, because of internal resistors built into a chip.
 		These drivers will output the actual voltage.
 
 		Typical usage:
@@ -104,58 +113,72 @@ in[0-8]_input	Voltage input value.
 			in7_*	varies
 			in8_*	varies
 
-cpu[0-1]_vid	CPU core reference voltage.
+cpu[0-*]_vid	CPU core reference voltage.
 		Unit: millivolt
-		Read only.
+		RO
 		Not always correct.
 
 vrm		Voltage Regulator Module version number. 
-		Read only.
-		Two digit number, first is major version, second is
-		minor version.
+		RW (but changing it should no more be necessary)
+		Originally the VRM standard version multiplied by 10, but now
+		an arbitrary number, as not all standards have a version
+		number.
 		Affects the way the driver calculates the CPU core reference
 		voltage from the vid pins.
 
+Also see the Alarms section for status flags associated with voltages.
+
 
 ********
 * Fans *
 ********
 
-fan[1-3]_min	Fan minimum value
+fan[1-*]_min	Fan minimum value
 		Unit: revolution/min (RPM)
-		Read/Write.
+		RW
 
-fan[1-3]_input	Fan input value.
+fan[1-*]_input	Fan input value.
 		Unit: revolution/min (RPM)
-		Read only.
+		RO
 
-fan[1-3]_div	Fan divisor.
+fan[1-*]_div	Fan divisor.
 		Integer value in powers of two (1, 2, 4, 8, 16, 32, 64, 128).
+		RW
 		Some chips only support values 1, 2, 4 and 8.
 		Note that this is actually an internal clock divisor, which
 		affects the measurable speed range, not the read value.
 
+Also see the Alarms section for status flags associated with fans.
+
+
 *******
 * PWM *
 *******
 
-pwm[1-3]	Pulse width modulation fan control.
+pwm[1-*]	Pulse width modulation fan control.
 		Integer value in the range 0 to 255
-		Read/Write
+		RW
 		255 is max or 100%.
 
-pwm[1-3]_enable
+pwm[1-*]_enable
 		Switch PWM on and off.
 		Not always present even if fan*_pwm is.
-		0 to turn off
-		1 to turn on in manual mode
-		2 to turn on in automatic mode
-		Read/Write
+		0: turn off
+		1: turn on in manual mode
+		2+: turn on in automatic mode
+		Check individual chip documentation files for automatic mode details.
+		RW
+
+pwm[1-*]_mode
+		0: DC mode
+		1: PWM mode
+		RW
 
 pwm[1-*]_auto_channels_temp
 		Select which temperature channels affect this PWM output in
 		auto mode. Bitfield, 1 is temp1, 2 is temp2, 4 is temp3 etc...
 		Which values are possible depend on the chip used.
+		RW
 
 pwm[1-*]_auto_point[1-*]_pwm
 pwm[1-*]_auto_point[1-*]_temp
@@ -163,6 +186,7 @@ pwm[1-*]_auto_point[1-*]_temp_hyst
 		Define the PWM vs temperature curve. Number of trip points is
 		chip-dependent. Use this for chips which associate trip points
 		to PWM output channels.
+		RW
 
 OR
 
@@ -172,51 +196,52 @@ temp[1-*]_auto_point[1-*]_temp_hyst
 		Define the PWM vs temperature curve. Number of trip points is
 		chip-dependent. Use this for chips which associate trip points
 		to temperature channels.
+		RW
 
 
 ****************
 * Temperatures *
 ****************
 
-temp[1-3]_type	Sensor type selection.
+temp[1-*]_type	Sensor type selection.
 		Integers 1 to 4 or thermistor Beta value (typically 3435)
-		Read/Write.
+		RW
 		1: PII/Celeron Diode
 		2: 3904 transistor
 		3: thermal diode
 		4: thermistor (default/unknown Beta)
 		Not all types are supported by all chips
 
-temp[1-4]_max	Temperature max value.
+temp[1-*]_max	Temperature max value.
 		Unit: millidegree Celcius
-		Read/Write value.
+		RW
 
-temp[1-3]_min	Temperature min value.
+temp[1-*]_min	Temperature min value.
 		Unit: millidegree Celcius
-		Read/Write value.
+		RW
 
-temp[1-3]_max_hyst
+temp[1-*]_max_hyst
 		Temperature hysteresis value for max limit.
 		Unit: millidegree Celcius
 		Must be reported as an absolute temperature, NOT a delta
 		from the max value.
-		Read/Write value.
+		RW
 
-temp[1-4]_input Temperature input value.
+temp[1-*]_input Temperature input value.
 		Unit: millidegree Celcius
-		Read only value.
+		RO
 
-temp[1-4]_crit	Temperature critical value, typically greater than
+temp[1-*]_crit	Temperature critical value, typically greater than
 		corresponding temp_max values.
 		Unit: millidegree Celcius
-		Read/Write value.
+		RW
 
-temp[1-2]_crit_hyst
+temp[1-*]_crit_hyst
 		Temperature hysteresis value for critical limit.
 		Unit: millidegree Celcius
 		Must be reported as an absolute temperature, NOT a delta
 		from the critical value.
-		Read/Write value.
+		RW
 
 temp[1-4]_offset
 		Temperature offset which is added to the temperature reading
@@ -231,6 +256,8 @@ temp[1-4]_offset
 		itself, for example the thermal diode inside the CPU or
 		a thermistor nearby.
 
+Also see the Alarms section for status flags associated with temperatures.
+
 
 ************
 * Currents *
@@ -239,17 +266,17 @@ temp[1-4]_offset
 Note that no known chip provides current measurements as of writing,
 so this part is theoretical, so to say.
 
-curr[1-n]_max	Current max value
+curr[1-*]_max	Current max value
 		Unit: milliampere
-		Read/Write.
+		RW
 
-curr[1-n]_min	Current min value.
+curr[1-*]_min	Current min value.
 		Unit: milliampere
-		Read/Write.
+		RW
 
-curr[1-n]_input	Current input value
+curr[1-*]_input	Current input value
 		Unit: milliampere
-		Read only.
+		RO
 
 
 **********
@@ -263,50 +290,54 @@ Usually a given chip will either use channel-related alarms, or
 limit-related alarms, not both. The driver should just reflect the hardware
 implementation.
 
-in[0-n]_alarm
-fan[1-n]_alarm
-temp[1-n]_alarm
+in[0-*]_alarm
+fan[1-*]_alarm
+temp[1-*]_alarm
 		Channel alarm
-		Boolean
-		Read-only
+		0: no alarm
+		1: alarm
+		RO
 
 OR
 
-in[0-n]_min_alarm
-in[0-n]_max_alarm
-fan[1-n]_min_alarm
-temp[1-n]_min_alarm
-temp[1-n]_max_alarm
-temp[1-n]_crit_alarm
+in[0-*]_min_alarm
+in[0-*]_max_alarm
+fan[1-*]_min_alarm
+temp[1-*]_min_alarm
+temp[1-*]_max_alarm
+temp[1-*]_crit_alarm
 		Limit alarm
-		Boolean
-		Read-only
+		0: no alarm
+		1: alarm
+		RO
 
 Each input channel may have an associated fault file. This can be used
 to notify open diodes, unconnected fans etc. where the hardware
 supports it. When this boolean has value 1, the measurement for that
 channel should not be trusted.
 
-in[0-n]_input_fault
-fan[1-n]_input_fault
-temp[1-n]_input_fault
+in[0-*]_input_fault
+fan[1-*]_input_fault
+temp[1-*]_input_fault
 		Input fault condition
-		Boolean
-		Read-only
+		0: no fault occured
+		1: fault condition
+		RO
 
 Some chips also offer the possibility to get beeped when an alarm occurs:
 
 beep_enable	Master beep enable
-		Boolean
-		Read/Write
+		0: no beeps
+		1: beeps
+		RW
 
-in[0-n]_beep
-fan[1-n]_beep
-temp[1-n]_beep
+in[0-*]_beep
+fan[1-*]_beep
+temp[1-*]_beep
 		Channel beep
-		0 to disable.
-		1 to enable.
-		Read/write
+		0: disable
+		1: enable
+		RW
 
 In theory, a chip could provide per-limit beep masking, but no such chip
 was seen so far.
@@ -316,7 +347,7 @@ beeps. These interface files are deprecated, but will be kept around
 for compatibility reasons:
 
 alarms		Alarm bitmask.
-		Read only.
+		RO
 		Integer representation of one to four bytes.
 		A '1' bit means an alarm.
 		Chips should be programmed for 'comparator' mode so that
@@ -333,7 +364,7 @@ beep_mask	Bitmask for beep.
 		Same format as 'alarms' with the same bit locations,
 		use discouraged for the same reason. Use individual
 		*_beep files instead.
-		Read/Write
+		RW
 
 
 *********
@@ -341,7 +372,9 @@ beep_mask	Bitmask for beep.
 *********
 
 eeprom		Raw EEPROM data in binary form.
-		Read only.
+		RO
 
 pec		Enable or disable PEC (SMBus only)
-		Read/Write
+		0: disable
+		1: enable
+		RW