Based on kernel version 3.16. Page generated on 2014-08-06 21:39 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 * Genesys Logic GL518SM release 0x80 9 Prefix: 'gl518sm' 10 Addresses scanned: I2C 0x2c and 0x2d 11 Datasheet: http://www.genesyslogic.com/ 12 13 Authors: 14 Frodo Looijaard <firstname.lastname@example.org>, 15 KyÃ¶sti MÃ¤lkki <email@example.com> 16 Hong-Gunn Chew <firstname.lastname@example.org> 17 Jean Delvare <email@example.com> 18 19 Description 20 ----------- 21 22 IMPORTANT: 23 24 For the revision 0x00 chip, the in0, in1, and in2 values (+5V, +3V, 25 and +12V) CANNOT be read. This is a limitation of the chip, not the driver. 26 27 This driver supports the Genesys Logic GL518SM chip. There are at least 28 two revision of this chip, which we call revision 0x00 and 0x80. Revision 29 0x80 chips support the reading of all voltages and revision 0x00 only 30 for VIN3. 31 32 The GL518SM implements one temperature sensor, two fan rotation speed 33 sensors, and four voltage sensors. It can report alarms through the 34 computer speakers. 35 36 Temperatures are measured in degrees Celsius. An alarm goes off while the 37 temperature is above the over temperature limit, and has not yet dropped 38 below the hysteresis limit. The alarm always reflects the current 39 situation. Measurements are guaranteed between -10 degrees and +110 40 degrees, with a accuracy of +/-3 degrees. 41 42 Rotation speeds are reported in RPM (rotations per minute). An alarm is 43 triggered if the rotation speed has dropped below a programmable limit. In 44 case when you have selected to turn fan1 off, no fan1 alarm is triggered. 45 46 Fan readings can be divided by a programmable divider (1, 2, 4 or 8) to 47 give the readings more range or accuracy. Not all RPM values can 48 accurately be represented, so some rounding is done. With a divider 49 of 2, the lowest representable value is around 1900 RPM. 50 51 Voltage sensors (also known as VIN sensors) report their values in volts. 52 An alarm is triggered if the voltage has crossed a programmable minimum or 53 maximum limit. Note that minimum in this case always means 'closest to 54 zero'; this is important for negative voltage measurements. The VDD input 55 measures voltages between 0.000 and 5.865 volt, with a resolution of 0.023 56 volt. The other inputs measure voltages between 0.000 and 4.845 volt, with 57 a resolution of 0.019 volt. Note that revision 0x00 chips do not support 58 reading the current voltage of any input except for VIN3; limit setting and 59 alarms work fine, though. 60 61 When an alarm is triggered, you can be warned by a beeping signal through your 62 computer speaker. It is possible to enable all beeping globally, or only the 63 beeping for some alarms. 64 65 If an alarm triggers, it will remain triggered until the hardware register 66 is read at least once (except for temperature alarms). This means that the 67 cause for the alarm may already have disappeared! Note that in the current 68 implementation, all hardware registers are read whenever any data is read 69 (unless it is less than 1.5 seconds since the last update). This means that 70 you can easily miss once-only alarms. 71 72 The GL518SM only updates its values each 1.5 seconds; reading it more often 73 will do no harm, but will return 'old' values.