1 Kernel driver sis5595 2 ===================== 3 4 Supported chips: 5 6 * Silicon Integrated Systems Corp. SiS5595 Southbridge Hardware Monitor 7 8 Prefix: 'sis5595' 9 10 Addresses scanned: ISA in PCI-space encoded address 11 12 Datasheet: Publicly available at the Silicon Integrated Systems Corp. site. 13 14 15 16 Authors: 17 18 - Kyösti Mälkki <kmalkki@cc.hut.fi>, 19 - Mark D. Studebaker <mdsxyz123@yahoo.com>, 20 - Aurelien Jarno <aurelien@aurel32.net> 2.6 port 21 22 SiS southbridge has a LM78-like chip integrated on the same IC. 23 This driver is a customized copy of lm78.c 24 25 Supports following revisions: 26 27 =============== =============== ============== 28 Version PCI ID PCI Revision 29 =============== =============== ============== 30 1 1039/0008 AF or less 31 2 1039/0008 B0 or greater 32 =============== =============== ============== 33 34 Note: these chips contain a 0008 device which is incompatible with the 35 5595. We recognize these by the presence of the listed 36 "blacklist" PCI ID and refuse to load. 37 38 =================== =============== ================ 39 NOT SUPPORTED PCI ID BLACKLIST PCI ID 40 =================== =============== ================ 41 540 0008 0540 42 550 0008 0550 43 5513 0008 5511 44 5581 0008 5597 45 5582 0008 5597 46 5597 0008 5597 47 630 0008 0630 48 645 0008 0645 49 730 0008 0730 50 735 0008 0735 51 =================== =============== ================ 52 53 54 Module Parameters 55 ----------------- 56 57 ======================= ===================================================== 58 force_addr=0xaddr Set the I/O base address. Useful for boards 59 that don't set the address in the BIOS. Does not do a 60 PCI force; the device must still be present in lspci. 61 Don't use this unless the driver complains that the 62 base address is not set. 63 64 Example: 'modprobe sis5595 force_addr=0x290' 65 ======================= ===================================================== 66 67 68 Description 69 ----------- 70 71 The SiS5595 southbridge has integrated hardware monitor functions. It also 72 has an I2C bus, but this driver only supports the hardware monitor. For the 73 I2C bus driver see i2c-sis5595. 74 75 The SiS5595 implements zero or one temperature sensor, two fan speed 76 sensors, four or five voltage sensors, and alarms. 77 78 On the first version of the chip, there are four voltage sensors and one 79 temperature sensor. 80 81 On the second version of the chip, the temperature sensor (temp) and the 82 fifth voltage sensor (in4) share a pin which is configurable, but not 83 through the driver. Sorry. The driver senses the configuration of the pin, 84 which was hopefully set by the BIOS. 85 86 Temperatures are measured in degrees Celsius. An alarm is triggered once 87 when the max is crossed; it is also triggered when it drops below the min 88 value. Measurements are guaranteed between -55 and +125 degrees, with a 89 resolution of 1 degree. 90 91 Fan rotation speeds are reported in RPM (rotations per minute). An alarm is 92 triggered if the rotation speed has dropped below a programmable limit. Fan 93 readings can be divided by a programmable divider (1, 2, 4 or 8) to give 94 the readings more range or accuracy. Not all RPM values can accurately be 95 represented, so some rounding is done. With a divider of 2, the lowest 96 representable value is around 2600 RPM. 97 98 Voltage sensors (also known as IN sensors) report their values in volts. An 99 alarm is triggered if the voltage has crossed a programmable minimum or 100 maximum limit. Note that minimum in this case always means 'closest to 101 zero'; this is important for negative voltage measurements. All voltage 102 inputs can measure voltages between 0 and 4.08 volts, with a resolution of 103 0.016 volt. 104 105 In addition to the alarms described above, there is a BTI alarm, which gets 106 triggered when an external chip has crossed its limits. Usually, this is 107 connected to some LM75-like chip; if at least one crosses its limits, this 108 bit gets set. 109 110 If an alarm triggers, it will remain triggered until the hardware register 111 is read at least once. This means that the cause for the alarm may already 112 have disappeared! Note that in the current implementation, all hardware 113 registers are read whenever any data is read (unless it is less than 1.5 114 seconds since the last update). This means that you can easily miss 115 once-only alarms. 116 117 The SiS5595 only updates its values each 1.5 seconds; reading it more often 118 will do no harm, but will return 'old' values. 119 120 Problems 121 -------- 122 Some chips refuse to be enabled. We don't know why. 123 The driver will recognize this and print a message in dmesg.
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