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60 lines
2.8 KiB
Bash
60 lines
2.8 KiB
Bash
#!/bin/sh
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export PATH="${PATH}:/sbin:/usr/sbin"
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echo "[$(date +'%x @ %X')] Kobo Suspend: Going to sleep . . ."
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# NOTE: Sleep as little as possible here, sleeping has a tendency to make everything mysteriously hang...
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# Depending on device/FW version, some kernels do not support wakeup_count, account for that
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if [ -e "/sys/power/wakeup_count" ] ; then
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#HAS_WAKEUP_COUNT="true"
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# NOTE: ... and of course, it appears to be broken, which probably explains why nickel doesn't use this facility...
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# (By broken, I mean that the system wakes up right away).
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# So, unless that changes, unconditionally disable it.
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HAS_WAKEUP_COUNT="false"
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fi
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# Clear the kernel ring buffer... (we're missing a proper -C flag...)
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#dmesg -c >/dev/null
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# Go to sleep
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if [ "${HAS_WAKEUP_COUNT}" == "true" ] ; then
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current_wakeup_count="$(cat /sys/power/wakeup_count)"
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echo "[$(date +'%x @ %X')] Kobo Suspend: Current WakeUp count: ${current_wakeup_count}"
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fi
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echo 1 > /sys/power/state-extended
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# NOTE: Sets gSleep_Mode_Suspend to 1. Used as a flag throughout the kernel to suspend/resume various subsystems
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# cf. kernel/power/main.c @ L#207
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echo "[$(date +'%x @ %X')] Kobo Suspend: Asked the kernel to put subsystems to sleep"
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sleep 2
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echo "[$(date +'%x @ %X')] Kobo Suspend: Waited for 2s because of reasons..."
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sync
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echo "[$(date +'%x @ %X')] Kobo Suspend: Synced FS"
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if [ "${HAS_WAKEUP_COUNT}" == "true" ] ; then
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echo ${current_wakeup_count} > /sys/power/wakeup_count
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echo "[$(date +'%x @ %X')] Kobo Suspend: Wrote WakeUp count: ${current_wakeup_count} ($?)"
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fi
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echo "[$(date +'%x @ %X')] Kobo Suspend: Asking for a suspend to RAM . . ."
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echo mem > /sys/power/state
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# NOTE: At this point, we *should* be in suspend to RAM, as such, execution should only resume on wakeup...
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echo "[$(date +'%x @ %X')] Kobo Suspend: ZzZ ZzZ ZzZ? ($?)"
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## NOTE: Ideally, we'd need a way to warn the user that suspending gloriously failed at this point...
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## We can safely assume that just from a non-zero return code, without looking at the detailed stderr message
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## (most of the failures we'll see are -EBUSY anyway)
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## For reference, when that happens to nickel, it appears to keep retrying to wakeup & sleep ad nauseam,
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## which is where the non-sensical 1 -> mem -> 0 loop idea comes from...
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## cf. nickel_suspend_strace.txt for more details.
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if [ "${HAS_WAKEUP_COUNT}" == "true" ] ; then
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echo "[$(date +'%x @ %X')] Kobo Suspend: Woke up! (WakeUp count: $(cat /sys/power/wakeup_count))"
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else
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echo "[$(date +'%x @ %X')] Kobo Suspend: Woke up!"
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fi
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# Print tke kernel log since our attempt to sleep...
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#dmesg -c
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# Now that we're up, unflag subsystems for suspend...
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# NOTE: We do that in Kobo:resume() to keep things tidy and easier to follow
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#echo 0 > /sys/power/state-extended
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#echo "[$(date +'%x @ %X')] Kobo Suspend: Unflagged kernel subsystems for suspend"
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