594fbe713b
GMT G762/763 fan speed PWM controller is connected directly to a fan and performs closed-loop or open-loop control of the fan speed. Two modes - PWM or DC - are supported by the chip. Introduced driver provides various knobs to control the operations of the chip (via sysfs interface). Specific characteristics of the system can be passed either using board init code or via DT. Documentation for both the driver and DT bindings are also provided. Signed-off-by: Arnaud Ebalard <arno@natisbad.org> Tested-by: Simon Guinot <simon.guinot@sequanux.org> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
3.0 KiB
Kernel driver g762
The GMT G762 Fan Speed PWM Controller is connected directly to a fan and performs closed-loop or open-loop control of the fan speed. Two modes - PWM or DC - are supported by the device.
For additional information, a detailed datasheet is available at http://natisbad.org/NAS/ref/GMT_EDS-762_763-080710-0.2.pdf. sysfs bindings are described in Documentation/hwmon/sysfs-interface.
The following entries are available to the user in a subdirectory of /sys/bus/i2c/drivers/g762/ to control the operation of the device. This can be done manually using the following entries but is usually done via a userland daemon like fancontrol.
Note that those entries do not provide ways to setup the specific hardware characteristics of the system (reference clock, pulses per fan revolution, ...); Those can be modified via devicetree bindings documented in Documentation/devicetree/bindings/hwmon/g762.txt or using a specific platform_data structure in board initialization file (see include/linux/platform_data/g762.h).
fan1_target: set desired fan speed. This only makes sense in closed-loop fan speed control (i.e. when pwm1_enable is set to 2).
fan1_input: provide current fan rotation value in RPM as reported by the fan to the device.
fan1_div: fan clock divisor. Supported value are 1, 2, 4 and 8.
fan1_pulses: number of pulses per fan revolution. Supported values are 2 and 4.
fan1_fault: reports fan failure, i.e. no transition on fan gear pin for about 0.7s (if the fan is not voluntarily set off).
fan1_alarm: in closed-loop control mode, if fan RPM value is 25% out of the programmed value for over 6 seconds 'fan1_alarm' is set to 1.
pwm1_enable: set current fan speed control mode i.e. 1 for manual fan speed control (open-loop) via pwm1 described below, 2 for automatic fan speed control (closed-loop) via fan1_target above.
pwm1_mode: set or get fan driving mode: 1 for PWM mode, 0 for DC mode.
pwm1: get or set PWM fan control value in open-loop mode. This is an integer value between 0 and 255. 0 stops the fan, 255 makes it run at full speed.
Both in PWM mode ('pwm1_mode' set to 1) and DC mode ('pwm1_mode' set to 0), when current fan speed control mode is open-loop ('pwm1_enable' set to 1), the fan speed is programmed by setting a value between 0 and 255 via 'pwm1' entry (0 stops the fan, 255 makes it run at full speed). In closed-loop mode ('pwm1_enable' set to 2), the expected rotation speed in RPM can be passed to the chip via 'fan1_target'. In closed-loop mode, the target speed is compared with current speed (available via 'fan1_input') by the device and a feedback is performed to match that target value. The fan speed value is computed based on the parameters associated with the physical characteristics of the system: a reference clock source frequency, a number of pulses per fan revolution, etc.
Note that the driver will update its values at most once per second.