Based on kernel version 2.6.26. Page generated on 2008-07-16 21:12 EST.
1 Kernel driver gl518sm 2 ===================== 3 4 Supported chips: 5 * Genesys Logic GL518SM release 0x00 6 Prefix: 'gl518sm' 7 Addresses scanned: I2C 0x2c and 0x2d 8 Datasheet: http://www.genesyslogic.com/pdf 9 * Genesys Logic GL518SM release 0x80 10 Prefix: 'gl518sm' 11 Addresses scanned: I2C 0x2c and 0x2d 12 Datasheet: http://www.genesyslogic.com/pdf 13 14 Authors: 15 Frodo Looijaard <frodol[AT]dds[DOT]nl>, 16 Kyösti Mälkki <kmalkki[AT]cc.hut[DOT]fi> 17 Hong-Gunn Chew <hglinux[AT]gunnet[DOT]org> 18 Jean Delvare <khali[AT]linux-fr[DOT]org> 19 20 Description 21 ----------- 22 23 IMPORTANT: 24 25 For the revision 0x00 chip, the in0, in1, and in2 values (+5V, +3V, 26 and +12V) CANNOT be read. This is a limitation of the chip, not the driver. 27 28 This driver supports the Genesys Logic GL518SM chip. There are at least 29 two revision of this chip, which we call revision 0x00 and 0x80. Revision 30 0x80 chips support the reading of all voltages and revision 0x00 only 31 for VIN3. 32 33 The GL518SM implements one temperature sensor, two fan rotation speed 34 sensors, and four voltage sensors. It can report alarms through the 35 computer speakers. 36 37 Temperatures are measured in degrees Celsius. An alarm goes off while the 38 temperature is above the over temperature limit, and has not yet dropped 39 below the hysteresis limit. The alarm always reflects the current 40 situation. Measurements are guaranteed between -10 degrees and +110 41 degrees, with a accuracy of +/-3 degrees. 42 43 Rotation speeds are reported in RPM (rotations per minute). An alarm is 44 triggered if the rotation speed has dropped below a programmable limit. In 45 case when you have selected to turn fan1 off, no fan1 alarm is triggered. 46 47 Fan readings can be divided by a programmable divider (1, 2, 4 or 8) to 48 give the readings more range or accuracy. Not all RPM values can 49 accurately be represented, so some rounding is done. With a divider 50 of 2, the lowest representable value is around 1900 RPM. 51 52 Voltage sensors (also known as VIN sensors) report their values in volts. 53 An alarm is triggered if the voltage has crossed a programmable minimum or 54 maximum limit. Note that minimum in this case always means 'closest to 55 zero'; this is important for negative voltage measurements. The VDD input 56 measures voltages between 0.000 and 5.865 volt, with a resolution of 0.023 57 volt. The other inputs measure voltages between 0.000 and 4.845 volt, with 58 a resolution of 0.019 volt. Note that revision 0x00 chips do not support 59 reading the current voltage of any input except for VIN3; limit setting and 60 alarms work fine, though. 61 62 When an alarm is triggered, you can be warned by a beeping signal through your 63 computer speaker. It is possible to enable all beeping globally, or only the 64 beeping for some alarms. 65 66 If an alarm triggers, it will remain triggered until the hardware register 67 is read at least once (except for temperature alarms). This means that the 68 cause for the alarm may already have disappeared! Note that in the current 69 implementation, all hardware registers are read whenever any data is read 70 (unless it is less than 1.5 seconds since the last update). This means that 71 you can easily miss once-only alarms. 72 73 The GL518SM only updates its values each 1.5 seconds; reading it more often 74 will do no harm, but will return 'old' values.