Use /sys/power/autosleep and wakelocks

[ghost]

This is the backend, so that the frontend can use the kernels 'autosleep' functionallity.

---

This change is 

[NiLuJe]

Looks good at a glance, thanks!

(Won't have time to test for a while, though).

[ghost]

Just a friendly ping @NiLuJe ;)

[NiLuJe]

Did not forget about it, hopefully I'll have more time in a few weeks, thanks ;).

[ghost]

https://m.youtube.com/watch?v=WhvOJai2FDg

Close and forget (which would bei a pitty imho)?

[Copilot]

Pull Request Overview

Adds backend support for the kernel’s autosleep functionality and introduces an epoll-based input wait mechanism, so the frontend can leverage /sys/power/autosleep.

• Writes to /sys/power/wake_lock and /sys/power/autosleep to manage standby.
• Implements waitForEventWithEpoll alongside a renamed select-based wait (waitForEventWithSelect), replacing the old waitForEvent.
• Hooks up RTC interrupts to wake from standby when powersave is active.

Comments suppressed due to low confidence (2)

input/input.c:448

• New autosleep setup/teardown functions lack tests to verify correct file writes and error paths.

static int setupAutosleep(int powersave_ms)

input/input.c:869

• The original waitForEvent entry was removed and replaced. This breaks existing consumers—consider keeping the old alias or marking it deprecated.

{ "waitForEvent", waitForInput },

[Copilot]

The EPOLLWAKEUP macro is defined but never used. Consider removing it or integrating it into the epoll event flags if needed.

Suggested change

	#if defined(WITH_RTC_INT)
	#ifndef EPOLLWAKEUP
	#define EPOLLWAKEUP (1u << 29)
	#endif
	#endif
	// Removed unused EPOLLWAKEUP macro definition.

[Copilot]

Typo in comment: 'insteat' should be 'instead'.

Suggested change

	// use epoll_create insteat() of epoll_create1() because of kindles old libc
	// use epoll_create instead() of epoll_create1() because of kindles old libc

[Copilot]

[nitpick] Leftover debug print; consider removing or guarding with a debug flag.

Suggested change

	event.data.fd = node->fd;
	printf("xxx input: timerfd=%d\n", node->fd);
	event.data.fd = node->fd;
	#ifdef DEBUG
	printf("xxx input: timerfd=%d\n", node->fd);
	#endif

[Copilot]

[nitpick] Debug logging remains here; remove or replace with structured logging.

[Copilot]

When failing to add an input fd to epoll, rtcfd (if opened) isn’t closed, causing a fd leak. Use close_epoll_fd(epoll_fd, rtcfd) instead.

[ghost]

(For me the said screen puzzling effect on a sage is very annoying. With this pr i had it exactly one time)

[NiLuJe]

Haven't forgotten about this, but I'm in the process of moving right now, so free time is in short supply ;).

[ghost]

https://m.youtube.com/watch?v=CIxYe3G3Iz4

So after exactly half a year no time for review?

If ist a Lack of time, merge it, ist works.
If ist a Lack of interrest drop it (than my Koreaner Version ist freezed at this Point, aus I have the Screen puzzling effect).

Sorry for the typos, it the auto correction, it my löst of interrest :(

[NiLuJe]

Definitely lack of time; it's installed on my Sage and I've been meaning to try it during the week, but I've barely managed 5min of reading time this week ;).

[ghost]

Well then --- after half a year after with no response --- I help to clean things up.