Based on kernel version 4.16.1. Page generated on 2018-04-09 11:53 EST.
1 Kernel driver sis5595 2 ===================== 3 4 Supported chips: 5 * Silicon Integrated Systems Corp. SiS5595 Southbridge Hardware Monitor 6 Prefix: 'sis5595' 7 Addresses scanned: ISA in PCI-space encoded address 8 Datasheet: Publicly available at the Silicon Integrated Systems Corp. site. 9 10 Authors: 11 Kyösti Mälkki <kmalkki@cc.hut.fi>, 12 Mark D. Studebaker <mdsxyz123@yahoo.com>, 13 Aurelien Jarno <aurelien@aurel32.net> 2.6 port 14 15 SiS southbridge has a LM78-like chip integrated on the same IC. 16 This driver is a customized copy of lm78.c 17 18 Supports following revisions: 19 Version PCI ID PCI Revision 20 1 1039/0008 AF or less 21 2 1039/0008 B0 or greater 22 23 Note: these chips contain a 0008 device which is incompatible with the 24 5595. We recognize these by the presence of the listed 25 "blacklist" PCI ID and refuse to load. 26 27 NOT SUPPORTED PCI ID BLACKLIST PCI ID 28 540 0008 0540 29 550 0008 0550 30 5513 0008 5511 31 5581 0008 5597 32 5582 0008 5597 33 5597 0008 5597 34 630 0008 0630 35 645 0008 0645 36 730 0008 0730 37 735 0008 0735 38 39 40 Module Parameters 41 ----------------- 42 force_addr=0xaddr Set the I/O base address. Useful for boards 43 that don't set the address in the BIOS. Does not do a 44 PCI force; the device must still be present in lspci. 45 Don't use this unless the driver complains that the 46 base address is not set. 47 Example: 'modprobe sis5595 force_addr=0x290' 48 49 50 Description 51 ----------- 52 53 The SiS5595 southbridge has integrated hardware monitor functions. It also 54 has an I2C bus, but this driver only supports the hardware monitor. For the 55 I2C bus driver see i2c-sis5595. 56 57 The SiS5595 implements zero or one temperature sensor, two fan speed 58 sensors, four or five voltage sensors, and alarms. 59 60 On the first version of the chip, there are four voltage sensors and one 61 temperature sensor. 62 63 On the second version of the chip, the temperature sensor (temp) and the 64 fifth voltage sensor (in4) share a pin which is configurable, but not 65 through the driver. Sorry. The driver senses the configuration of the pin, 66 which was hopefully set by the BIOS. 67 68 Temperatures are measured in degrees Celsius. An alarm is triggered once 69 when the max is crossed; it is also triggered when it drops below the min 70 value. Measurements are guaranteed between -55 and +125 degrees, with a 71 resolution of 1 degree. 72 73 Fan rotation speeds are reported in RPM (rotations per minute). An alarm is 74 triggered if the rotation speed has dropped below a programmable limit. Fan 75 readings can be divided by a programmable divider (1, 2, 4 or 8) to give 76 the readings more range or accuracy. Not all RPM values can accurately be 77 represented, so some rounding is done. With a divider of 2, the lowest 78 representable value is around 2600 RPM. 79 80 Voltage sensors (also known as IN sensors) report their values in volts. An 81 alarm is triggered if the voltage has crossed a programmable minimum or 82 maximum limit. Note that minimum in this case always means 'closest to 83 zero'; this is important for negative voltage measurements. All voltage 84 inputs can measure voltages between 0 and 4.08 volts, with a resolution of 85 0.016 volt. 86 87 In addition to the alarms described above, there is a BTI alarm, which gets 88 triggered when an external chip has crossed its limits. Usually, this is 89 connected to some LM75-like chip; if at least one crosses its limits, this 90 bit gets set. 91 92 If an alarm triggers, it will remain triggered until the hardware register 93 is read at least once. This means that the cause for the alarm may already 94 have disappeared! Note that in the current implementation, all hardware 95 registers are read whenever any data is read (unless it is less than 1.5 96 seconds since the last update). This means that you can easily miss 97 once-only alarms. 98 99 The SiS5595 only updates its values each 1.5 seconds; reading it more often 100 will do no harm, but will return 'old' values. 101 102 Problems 103 -------- 104 Some chips refuse to be enabled. We don't know why. 105 The driver will recognize this and print a message in dmesg.