summaryrefslogtreecommitdiff
path: root/Documentation/hwmon/gl518sm
diff options
context:
space:
mode:
authorDavid Woodhouse <dwmw2@shinybook.infradead.org>2005-07-13 15:25:59 +0100
committerDavid Woodhouse <dwmw2@shinybook.infradead.org>2005-07-13 15:25:59 +0100
commit30beab1491f0b96b2f23d3fb68af01fd921a16d8 (patch)
treec580bdc0846269fbb10feeda901ecec1a48ee2ef /Documentation/hwmon/gl518sm
parent21af6c4f2aa5f63138871b4ddd77d7ebf2588c9d (diff)
parentc32511e2718618f0b53479eb36e07439aa363a74 (diff)
Merge with /shiny/git/linux-2.6/.git
Diffstat (limited to 'Documentation/hwmon/gl518sm')
-rw-r--r--Documentation/hwmon/gl518sm74
1 files changed, 74 insertions, 0 deletions
diff --git a/Documentation/hwmon/gl518sm b/Documentation/hwmon/gl518sm
new file mode 100644
index 000000000000..ce0881883bca
--- /dev/null
+++ b/Documentation/hwmon/gl518sm
@@ -0,0 +1,74 @@
+Kernel driver gl518sm
+=====================
+
+Supported chips:
+ * Genesys Logic GL518SM release 0x00
+ Prefix: 'gl518sm'
+ Addresses scanned: I2C 0x2c and 0x2d
+ Datasheet: http://www.genesyslogic.com/pdf
+ * Genesys Logic GL518SM release 0x80
+ Prefix: 'gl518sm'
+ Addresses scanned: I2C 0x2c and 0x2d
+ Datasheet: http://www.genesyslogic.com/pdf
+
+Authors:
+ Frodo Looijaard <frodol@dds.nl>,
+ Kyösti Mälkki <kmalkki@cc.hut.fi>
+ Hong-Gunn Chew <hglinux@gunnet.org>
+ Jean Delvare <khali@linux-fr.org>
+
+Description
+-----------
+
+IMPORTANT:
+
+For the revision 0x00 chip, the in0, in1, and in2 values (+5V, +3V,
+and +12V) CANNOT be read. This is a limitation of the chip, not the driver.
+
+This driver supports the Genesys Logic GL518SM chip. There are at least
+two revision of this chip, which we call revision 0x00 and 0x80. Revision
+0x80 chips support the reading of all voltages and revision 0x00 only
+for VIN3.
+
+The GL518SM implements one temperature sensor, two fan rotation speed
+sensors, and four voltage sensors. It can report alarms through the
+computer speakers.
+
+Temperatures are measured in degrees Celsius. An alarm goes off while the
+temperature is above the over temperature limit, and has not yet dropped
+below the hysteresis limit. The alarm always reflects the current
+situation. Measurements are guaranteed between -10 degrees and +110
+degrees, with a accuracy of +/-3 degrees.
+
+Rotation speeds are reported in RPM (rotations per minute). An alarm is
+triggered if the rotation speed has dropped below a programmable limit. In
+case when you have selected to turn fan1 off, no fan1 alarm is triggered.
+
+Fan readings can be divided by a programmable divider (1, 2, 4 or 8) to
+give the readings more range or accuracy. Not all RPM values can
+accurately be represented, so some rounding is done. With a divider
+of 2, the lowest representable value is around 1900 RPM.
+
+Voltage sensors (also known as VIN sensors) report their values in volts.
+An alarm is triggered if the voltage has crossed a programmable minimum or
+maximum limit. Note that minimum in this case always means 'closest to
+zero'; this is important for negative voltage measurements. The VDD input
+measures voltages between 0.000 and 5.865 volt, with a resolution of 0.023
+volt. The other inputs measure voltages between 0.000 and 4.845 volt, with
+a resolution of 0.019 volt. Note that revision 0x00 chips do not support
+reading the current voltage of any input except for VIN3; limit setting and
+alarms work fine, though.
+
+When an alarm is triggered, you can be warned by a beeping signal through your
+computer speaker. It is possible to enable all beeping globally, or only the
+beeping for some alarms.
+
+If an alarm triggers, it will remain triggered until the hardware register
+is read at least once (except for temperature alarms). This means that the
+cause for the alarm may already have disappeared! Note that in the current
+implementation, all hardware registers are read whenever any data is read
+(unless it is less than 1.5 seconds since the last update). This means that
+you can easily miss once-only alarms.
+
+The GL518SM only updates its values each 1.5 seconds; reading it more often
+will do no harm, but will return 'old' values.