| Kernel driver sis5595 |
| ===================== |
| |
| Supported chips: |
| * Silicon Integrated Systems Corp. SiS5595 Southbridge Hardware Monitor |
| Prefix: 'sis5595' |
| Addresses scanned: ISA in PCI-space encoded address |
| Datasheet: Publicly available at the Silicon Integrated Systems Corp. site. |
| |
| Authors: |
| Kyösti Mälkki <kmalkki@cc.hut.fi>, |
| Mark D. Studebaker <mdsxyz123@yahoo.com>, |
| Aurelien Jarno <aurelien@aurel32.net> 2.6 port |
| |
| SiS southbridge has a LM78-like chip integrated on the same IC. |
| This driver is a customized copy of lm78.c |
| |
| Supports following revisions: |
| Version PCI ID PCI Revision |
| 1 1039/0008 AF or less |
| 2 1039/0008 B0 or greater |
| |
| Note: these chips contain a 0008 device which is incompatible with the |
| 5595. We recognize these by the presence of the listed |
| "blacklist" PCI ID and refuse to load. |
| |
| NOT SUPPORTED PCI ID BLACKLIST PCI ID |
| 540 0008 0540 |
| 550 0008 0550 |
| 5513 0008 5511 |
| 5581 0008 5597 |
| 5582 0008 5597 |
| 5597 0008 5597 |
| 630 0008 0630 |
| 645 0008 0645 |
| 730 0008 0730 |
| 735 0008 0735 |
| |
| |
| Module Parameters |
| ----------------- |
| force_addr=0xaddr Set the I/O base address. Useful for boards |
| that don't set the address in the BIOS. Does not do a |
| PCI force; the device must still be present in lspci. |
| Don't use this unless the driver complains that the |
| base address is not set. |
| Example: 'modprobe sis5595 force_addr=0x290' |
| |
| |
| Description |
| ----------- |
| |
| The SiS5595 southbridge has integrated hardware monitor functions. It also |
| has an I2C bus, but this driver only supports the hardware monitor. For the |
| I2C bus driver see i2c-sis5595. |
| |
| The SiS5595 implements zero or one temperature sensor, two fan speed |
| sensors, four or five voltage sensors, and alarms. |
| |
| On the first version of the chip, there are four voltage sensors and one |
| temperature sensor. |
| |
| On the second version of the chip, the temperature sensor (temp) and the |
| fifth voltage sensor (in4) share a pin which is configurable, but not |
| through the driver. Sorry. The driver senses the configuration of the pin, |
| which was hopefully set by the BIOS. |
| |
| Temperatures are measured in degrees Celsius. An alarm is triggered once |
| when the max is crossed; it is also triggered when it drops below the min |
| value. Measurements are guaranteed between -55 and +125 degrees, with a |
| resolution of 1 degree. |
| |
| Fan rotation speeds are reported in RPM (rotations per minute). An alarm is |
| triggered if the rotation speed has dropped below a programmable limit. 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 2600 RPM. |
| |
| Voltage sensors (also known as IN 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. All voltage |
| inputs can measure voltages between 0 and 4.08 volts, with a resolution of |
| 0.016 volt. |
| |
| In addition to the alarms described above, there is a BTI alarm, which gets |
| triggered when an external chip has crossed its limits. Usually, this is |
| connected to some LM75-like chip; if at least one crosses its limits, this |
| bit gets set. |
| |
| If an alarm triggers, it will remain triggered until the hardware register |
| is read at least once. 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 SiS5595 only updates its values each 1.5 seconds; reading it more often |
| will do no harm, but will return 'old' values. |
| |
| Problems |
| -------- |
| Some chips refuse to be enabled. We don't know why. |
| The driver will recognize this and print a message in dmesg. |
| |
