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authorJean Delvare <khali@linux-fr.org>2007-08-20 16:44:44 +0200
committerMark M. Hoffman <mhoffman@lightlink.com>2007-10-09 22:56:29 -0400
commit176544dc55b0a912a2e1bacb9f48ccbd4aabd55f (patch)
tree6a13f5cf26dddfb9d8223579878a6a60c01ab0e2 /Documentation/hwmon
parent8477d026893d42b00474e9a13ab01ccce7fc2673 (diff)
hwmon: Update the sysfs interface documentation
* 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>
Diffstat (limited to 'Documentation/hwmon')
-rw-r--r--Documentation/hwmon/sysfs-interface75
1 files changed, 41 insertions, 34 deletions
diff --git a/Documentation/hwmon/sysfs-interface b/Documentation/hwmon/sysfs-interface
index 331fa7a1d7d..db7bb4a659c 100644
--- a/Documentation/hwmon/sysfs-interface
+++ b/Documentation/hwmon/sysfs-interface
@@ -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.
-
- 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
+ These drivers will output the actual voltage. Rule of
+ thumb: drivers should report the voltage values at the
+ "pins" of the chip.
+
+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