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- 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.
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