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>

diff --git a/Documentation/hwmon/sysfs-interface b/Documentation/hwmon/sysfs-interface
index 331fa7a..db7bb4a 100644 (file)
--- 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