My research so far into how triggers work was mostly so that I can use the wwan module trigger on the SE10 board I have here, and therefore I did not look into how to write a generic led trigger usable on more then a specific led.
Thanks a lot for clearing up possible misunderstandings,
Fiona
>
>> +/// `trigger_activate` function pointer
>> +///
>> +/// # Safety
>> +///
>> +/// `led_cdev` must be passed by the corresponding callback in `led_trigger`.
>> +unsafe extern "C" fn trigger_activate<T>(led_cdev: *mut bindings::led_classdev) -> i32
>> +where
>> + T: HardwareOperations,
>> +{
>> + from_result(|| {
>> + // SAFETY: By the safety requirement of this function `led_cdev` is embedded inside a `T::This<T>`.
>> + let led = unsafe { &mut *(T::This::led_container_of(led_cdev.cast())) };
>> + T::activate(led)?;
>> + Ok(0)
>> + })
>> +}
>> +
>> +/// `trigger_deactivate` function pointer
>> +///
>> +/// # Safety
>> +///
>> +/// `led_cdev` must be passed by the corresponding callback in `led_trigger`.
>> +unsafe extern "C" fn trigger_deactivate<T>(led_cdev: *mut bindings::led_classdev)
>> +where
>> + T: HardwareOperations,
>> +{
>> + // SAFETY: By the safety requirement of this function `led_cdev` is embedded inside a `T::This<T>`.
>> + let led = unsafe { &mut *(T::This::led_container_of(led_cdev.cast())) };
>> + T::deactivate(led)
>> +}
>> --
>> 2.47.0
>>
>>
