On Tue, Aug 20, 2024 at 11:50:10AM +0530, Raag Jadav wrote: > Add hwmon support for fan1_input attribute, which will expose fan speed > in RPM. With this in place we can monitor fan speed using lm-sensors tool. > > $ sensors > i915-pci-0300 > Adapter: PCI adapter > in0: 653.00 mV > fan1: 3833 RPM > power1: N/A (max = 43.00 W) > energy1: 32.02 kJ > v2: Handle overflow, add mutex protection and ABI documentation > Aesthetic adjustments (Riana) > v3: Change rotations data type, ABI date and version > v4: Fix wakeref leak > Drop switch case and simplify hwm_fan_xx() (Andi) > v5: Rework time calculation, aesthetic adjustments (Andy) > v6: Drop overflow logic (Andy) > Aesthetic adjustments (Badal) But it still has an issue with 64-bit division on 32-bit platforms, right? ... > + /* > + * Calculate fan speed in RPM by time averaging two subsequent > + * readings in minutes. > + * RPM = number of rotations * msecs per minute / time in msecs > + */ > + *val = DIV_ROUND_UP(rotations * (MSEC_PER_SEC * 60), time); ...somewhere here? -- With Best Regards, Andy Shevchenko
