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hwmon: Update the sysfs interface documentation

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* Document the name attribute.
* Document the *_label attributes.
* Drop "typical usage" lists, they no longer match the reality.
* Drop non hardware-monitoring related entries.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Acked-by: Hans de Goede <j.w.r.degoede@hhs.nl>
Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com>
This commit is contained in:
Jean Delvare 2007-08-20 16:44:44 +02:00 committed by Mark M. Hoffman
parent 8477d02689
commit 176544dc55
1 changed files with 40 additions and 33 deletions
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73
Documentation/hwmon/sysfs-interface
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@ -78,8 +78,21 @@ RW read/write value
Read/write values may be read-only for some chips, depending on the
hardware implementation.
All entries are optional, and should only be created in a given driver
if the chip has the feature.
All entries (except name) are optional, and should only be created in a
given driver if the chip has the feature.
********
* Name *
********
name The chip name.
This should be a short, lowercase string, not containing
spaces nor dashes, representing the chip name. This is
the only mandatory attribute.
I2C devices get this attribute created automatically.
RO
************
* Voltages *
@ -104,18 +117,17 @@ in[0-*]_input Voltage input value.
by the chip driver, and must be done by the application.
However, some drivers (notably lm87 and via686a)
do scale, because of internal resistors built into a chip.
These drivers will output the actual voltage.
These drivers will output the actual voltage. Rule of
thumb: drivers should report the voltage values at the
"pins" of the chip.
Typical usage:
in0_* CPU #1 voltage (not scaled)
in1_* CPU #2 voltage (not scaled)
in2_* 3.3V nominal (not scaled)
in3_* 5.0V nominal (scaled)
in4_* 12.0V nominal (scaled)
in5_* -12.0V nominal (scaled)
in6_* -5.0V nominal (scaled)
in7_* varies
in8_* varies
in[0-*]_label Suggested voltage channel label.
Text string
Should only be created if the driver has hints about what
this voltage channel is being used for, and user-space
doesn't. In all other cases, the label is provided by
user-space.
RO
cpu[0-*]_vid CPU core reference voltage.
Unit: millivolt
@ -159,6 +171,13 @@ fan[1-*]_target
Only makes sense if the chip supports closed-loop fan speed
control based on the measured fan speed.
fan[1-*]_label Suggested fan channel label.
Text string
Should only be created if the driver has hints about what
this fan channel is being used for, and user-space doesn't.
In all other cases, the label is provided by user-space.
RO
Also see the Alarms section for status flags associated with fans.
@ -260,18 +279,19 @@ temp[1-*]_crit_hyst
from the critical value.
RW
temp[1-4]_offset
temp[1-*]_offset
Temperature offset which is added to the temperature reading
by the chip.
Unit: millidegree Celsius
Read/Write value.
If there are multiple temperature sensors, temp1_* is
generally the sensor inside the chip itself,
reported as "motherboard temperature". temp2_* to
temp4_* are generally sensors external to the chip
itself, for example the thermal diode inside the CPU or
a thermistor nearby.
temp[1-*]_label Suggested temperature channel label.
Text string
Should only be created if the driver has hints about what
this temperature channel is being used for, and user-space
doesn't. In all other cases, the label is provided by
user-space.
RO
Some chips measure temperature using external thermistors and an ADC, and
report the temperature measurement as a voltage. Converting this voltage
@ -391,16 +411,3 @@ beep_mask Bitmask for beep.
use discouraged for the same reason. Use individual
*_beep files instead.
RW
*********
* Other *
*********
eeprom Raw EEPROM data in binary form.
RO
pec Enable or disable PEC (SMBus only)
0: disable
1: enable
RW