Kernel driver `adm1026.o' ====================== Status: In development Supported chips: * Analog Devices ADM1026 Prefix: 'adm1026' Addresses scanned: I2C 0x2c, 0x2d, 0x2e Author: Philip Pokorny for Penguin Computing Module Parameters ----------------- * force: short array (min = 1, max = 48) List of adapter,address pairs to boldly assume to be present * force_adm1026: short array (min = 1, max = 48) List of adapter,address pairs which are unquestionably assumed to contain an `adm1026' chip * ignore: short array (min = 1, max = 48) List of adapter,address pairs not to scan * ignore_range: short array (min = 1, max = 48) List of adapter,start-addr,end-addr triples not to scan * probe: short array (min = 1, max = 48) List of adapter,address pairs to scan additionally * probe_range: short array (min = 1, max = 48) List of adapter,start-addr,end-addr triples to scan additionally The following only apply to the first ADM1026 detected. These are a workaround for if your BIOS hasn't setup your chip. * gpio_input: int array (min = 1, max = 17) List of GPIO pins (0-16) to program as inputs * gpio_output: int array (min = 1, max = 17) List of GPIO pins (0-16) to program as outputs * gpio_inverted: int array (min = 1, max = 17) List of GPIO pins (0-16) to program as inverted * gpio_normal: int array (min = 1, max = 17) List of GPIO pins (0-16) to program as normal/non-inverted * gpio_fan: int array (min = 1, max = 8) List of GPIO pins (0-7) to program as fan tachs Description ----------- This driver implements support for the Analog Devices ADM1026. Analog Devices calls it a "complete thermal system management controller." The ADM1026 implements three (3) temperature sensors, 17 voltage sensors, 16 general purpose digital I/O lines, eight (8) fan speed sensors (8-bit), an analog output and a PWM output along with limit, alarm and mask bits for all of the above. There is even 8k bytes of EEPROM memory on chip. Temperatures are measured in degrees Celsius. There are two external sensor inputs and one internal sensor. Each sensor has a high and low limit. If the limit is exceeded, an interrupt (#SMBALERT) can be generated. The interrupts can be masked. In addition, there are over-temp limits for each sensor. If this limit is exceeded, the #THERM output will be asserted. The current temperature and limits have a resolution of 1 degree. Fan rotation speeds are reported in RPM (rotations per minute) but measured in counts of a 22.5kHz internal clock. Each fan has a high limit which corresponds to a minimum fan speed. If the limit is exceeded, an interrupt can be generated. Each fan can be programmed to divide the reference clock by 1, 2, 4 or 8. Not all RPM values can accurately be represented, so some rounding is done. With a divider of 8, the slowest measureable speed of a one pulse per rev fan is 1323 RPM. Two pulse per rev fans can be measured as slow as 661 RPM. Voltage sensors (in0 to in16) 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. Several inputs have integrated attenuators so they can measure higher voltages directly. 3.3V, 5V, 12V, -12V and battery voltage all have dedicated inputs. There are several inputs scaled to 0-3V full-scale range for SCSI terminator power. The remaining inputs are not scaled and have a 0-2.5V full-scale range. A 2.5V or 1.82V reference voltage is provided for negative voltage measurements. 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 2.0 seconds since the last update). This means that you can easily miss once-only alarms. The ADM1026 measures continuously. Analog inputs are measured about 4 times a second. Fan speed measurement time depends on fan speed and divisor. It can take as long as 1.5 seconds to measure all fan speeds. The ADM1026 has the ability to automaticaly control fan speed based on the temperature sensor inputs. Both the PWM output and the DAC output can be used to control fan speed. Usually only one of these two outputs will be used. Write the minimum PWM or DAC value to the appropriate control register. Then set the low temperature limit in the tmin values for each temperature sensor. The range of control is fixed at 20 degC, and the largest difference between current and tmin of the temperature sensors sets the control output. See the datasheet for several example circuits for controlling fan speed with the PWM and DAC outputs. The fan speed sensors do not have PWM compensation, so it is probably best to control the fan voltage from the power lead rather than on the ground lead. The datasheet shows an example application with VID signals attached to GPIO lines. Unfortunately, the chip may not be connected to the VID lines in this way. The driver assumes that the chips *is* connected this way to get a vid voltage. If the VID value is wrong or not wired as shown in the example, then you will need to write the correct VID value to the driver either based on the GPIO values or setting it directly. The value written to VID should be the *raw* VID value (0 to 0x3f) or -1 (to restore the default value). When read, the vid interface returns the scaled voltage according to the VRM spec selected. Example sensors.conf -------------------- Here is an example sensors.conf configuration section for the ADM1026. --------- cut here --------- chip "adm1026-*" # Voltage inputs label in0 "V2.25_0" # Scaled for "SCSI terminator"? label in1 "V2.25_1" # supply voltage? label in2 "V2.25_2" label in3 "V2.25_3" label in4 "V2.25_4" label in5 "V2.25_5" label in6 "V1.875_0" # Unscaled inputs label in7 "V1.875_1" # If temp3 is enabled, in8 and in9 are disabled. # label in8 "V1.875_2" # label in9 "V1.875_3" ignore in8 ignore in9 # Dedicated voltage inputs label in10 "Vbat" label in11 "V3.3STBY" label in12 "V3.3MAIN" label in13 "V5" label in14 "Vccp" label in15 "V12" label in16 "V-12" # Temperature inputs label temp1 "Board" label temp2 "CPU0" label temp3 "CPU1" # Fan inputs label fan0 "CPU_Fan" label fan1 "Fan1" label fan2 "Fan2" label fan3 "Fan3" label fan4 "Fan4" label fan5 "Fan5" label fan6 "Fan6" label fan7 "Fan7" # PWM Outputs label pwm "PWM" # Voltage scaling is done on-chip. No 'compute' directive # should be necessary. If in0-in9 have external scaling, # set it here. # compute in0 @ * 2.5, @ / 2.5 # Adjust fans speeds for actual pulses per rev # compute fan0 @ / 2, @ * 2 # 2 pulse per rev # compute fan1 @ / 3, @ * 3 # 3 pulse per rev # compute fan2 @ / 4, @ * 4 # 4 pulse per rev # compute fan3 @ / 8, @ * 8 # 8 pulse per rev # Set VRM version set vrm 9.1 # set vid 1.580 # Set voltage limits set in10_min 3.0 * 0.95 set in10_max 3.0 * 1.05 set in11_min 3.3 * 0.95 set in11_max 3.3 * 1.05 set in12_min 3.3 * 0.95 set in12_max 3.3 * 1.05 set in13_min 5.0 * 0.95 set in13_max 5.0 * 1.05 # Uncomment if VID is wired or set above # set in14_min vid * 0.95 # set in14_max vid * 1.05 set in15_min 12 * 0.95 set in15_max 12 * 1.05 set in16_min -12 * 0.95 set in16_max -12 * 1.05 # Set Fan limits set fan0_min 7000 set fan1_min 7000 set fan2_min 7000 set fan3_min 7000 set fan4_min 3000 set fan5_min 3000 set fan6_min 3000 set fan7_min 3000