Here is the problem with that. You use a different kernel to me and you don’t
like to use systemd. Hence I will explain how to get this working, but you are
going to have to do the coding and testing. To start with, which kernel are you
using?
>From the TPS65217 datasheet the ACI bit in the INT register (0x02) will be a 1
>if the power status changed (either power on or power fail). The state of the
>power is in the status register (0xA) which is 0 for no power and 1 for power
>in valid range. So looking at the Interrupt routing, both events are reported.
>I would recommend changing the input key to something different to KEY_POWER
>because we do not want to modify the pwr button behavior.
if (int_reg & TPS65217_INT_ACI) {
/* Handle AC power status change */
dev_dbg(tps->dev, "AC power status change\n");
/* Press KEY_POWER when AC not present */
input_report_key(tps->pwr_but, KEY_POWER,
~status_reg & TPS65217_STATUS_ACPWR);
input_sync(tps->pwr_but);
}
You might have to change input_report_key to input_report_switch as I’m not
sure if we can extract the status from EV_KEY.
Using udev, the input key is linked to this systemd service poweroff.target
===
# This file is part of systemd.
#
# systemd is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
[Unit]
Description=Power-Off
Documentation=man:systemd.special(7)
DefaultDependencies=no
Requires=systemd-poweroff.service
After=systemd-poweroff.service
AllowIsolate=yes
[Install]
Alias=ctrl-alt-del.target
===
Which in turn runs the systemd-poweroff.service
===
# This file is part of systemd.
#
# systemd is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
[Unit]
Description=Power-Off
Documentation=man:systemd-halt.service(8)
DefaultDependencies=no
Requires=shutdown.target umount.target final.target
After=shutdown.target umount.target final.target
[Service]
Type=oneshot
ExecStart=/bin/systemctl --force poweroff
===
Which powers down the board.
So here is what you need to do. When you receive a input key assigned to
AC_Power, with a status of fail, start a daemon with a timer. If the timer
expires, do the same systemctl poweroff or shutdown -h now. If you get a input
key for AC_Power with status of power_good before the timer expires, either
kill the daemon or cancel the timer.
Hope this helps.
Regards,
John
> On Apr 19, 2016, at 6:29 PM, William Hermans <yyrk...@gmail.com> wrote:
>
> Good, now add it.
>
> On Tue, Apr 19, 2016 at 5:16 PM, John Syne <john3...@gmail.com
> <mailto:john3...@gmail.com>> wrote:
> In my last e-mail on this issue, I said "Also, the interrupt routine does not
> report power good, so that would have to be added”. It is a simple thing to
> add.
>
> Regards,
> John
>
>
>
>
>> On Apr 19, 2016, at 3:30 PM, William Hermans <yyrk...@gmail.com
>> <mailto:yyrk...@gmail.com>> wrote:
>>
>> So there is apparently a bug related to this whole situation. Once the input
>> power goes away, whatever it may be. You lose USB, because the PMIC is not
>> longer able to supply 5V. You even get a kernel message in relation to this
>> from musb.
>>
>> The problem is, once input power is restored, I see no indication that 5V is
>> restored to USB. So If you tail -f /var/log/messages, you'll see one musb
>> message when pulling power, but you will not see a corresponding message
>> when plugging power back in. Additionally if you pull power multiple times.
>> Only the first message is displayed.
>>
>> What this tells me is that the current kernel modules are not written to
>> deal / handle this yet. So for now, unless I'm wrong ( which i doubt ). It's
>> best just to power down period. After input power goes away, and simply use
>> an R/C network to "time" system up's, in case power goes up / down rapidly.
>> One, or more times consecutively.
>>
>> On Mon, Apr 18, 2016 at 6:26 PM, William Hermans <yyrk...@gmail.com
>> <mailto:yyrk...@gmail.com>> wrote:
>> I have an interest in this. It's way above my pay grade from a programming
>> perspective...
>>
>> Mike
>>
>> Hi Mike,
>>
>> This is actually something I'm personally very interested in too. However,
>> at this moment in time, my buddy and I are actually in the process of making
>> two different capes for the beaglebone. So this is one of those situations
>> where you have to have priorities . . . and while I obviously do not know
>> everything involved to get this certain thing done, it is not above my pay
>> grade.
>>
>> So perhaps in the future, it may be something I'll revisit, and would be
>> something I'd contribute back to the community.
>>
>> On Mon, Apr 18, 2016 at 2:26 PM, Mike <bellyac...@gmail.com
>> <mailto:bellyac...@gmail.com>> wrote:
>> On 04/18/2016 03:31 PM, John Syne wrote:
>>> That is OK if this doesn’t work for you, but there are other BBB users who
>>> might find this helpful. Currently the powerfail uses the same key function
>>> as the pwr button, so the first place to start would be changing the key
>>> function to something else. Also, the interrupt routine does not report
>>> power good, so that would have to be added. After that, a systemd service
>>> could take care of the rest.
>>>
>>> Regards,
>>> John
>>>
>>>
>>
>> I have an interest in this. It's way above my pay grade from a programming
>> perspective...
>>
>> Mike
>>
>>>
>>>
>>>> On Apr 18, 2016, at 11:31 AM, William Hermans <yyrk...@gmail.com
>>>> <mailto:yyrk...@gmail.com>> wrote:
>>>>
>>>> #1
>>>> william@beaglebone:~$ ls /etc/udev/rules.d/
>>>> 50-hidraw.rules 50-spi.rules 60-omap-tty.rules 70-persistent-net.rules
>>>> uio.rules
>>>>
>>>> #2
>>>> We do not care about the button press. We *did* care about what happens
>>>> when power is removed, while a battery is connected.
>>>>
>>>> Now we do not care. We're not going to bother with it. It's too much
>>>> hassle for a result that is not really all that important. So what if the
>>>> power down routine is inefficient . . . it works.
>>>>
>>>> On Mon, Apr 18, 2016 at 10:29 AM, John Syne <
>>>> <mailto:john3...@gmail.com>john3...@gmail.com <mailto:john3...@gmail.com>>
>>>> wrote:
>>>> I asked Robert how the pwr button is processed and interestingly it is
>>>> done via udev and systemd. Also, there is some new code going mainstream
>>>> for the pwr button and battery charger. Perhaps you can implement the
>>>> timer delay via a custom systemd service. Here is what Robert sent me:
>>>>
>>>> Oh this is finally getting upstreamed:
>>>>
>>>> https://www.spinics.net/lists/linux-omap/msg127184.html
>>>> <https://www.spinics.net/lists/linux-omap/msg127184.html>
>>>>
>>>> I need to switch to their version, vs our 3.8.13 erra hack that's been
>>>> forward ported for years. ;)
>>>>
>>>> Behind the scenes's that patch is reporting a key-event to systemd...
>>>>
>>>> https://github.com/systemd/systemd/blob/09541e49ebd17b41482e447dd8194942f39788c0/src/login/70-power-switch.rules#L13
>>>>
>>>> <https://github.com/systemd/systemd/blob/09541e49ebd17b41482e447dd8194942f39788c0/src/login/70-power-switch.rules#L13>
>>>>
>>>> Regards,
>>>> John
>>>>
>>>>
>>>>
>>>>
>>>>> On Apr 17, 2016, at 11:06 PM, William Hermans <
>>>>> <mailto:yyrk...@gmail.com>yyrk...@gmail.com <mailto:yyrk...@gmail.com>>
>>>>> wrote:
>>>>>
>>>>> There is no timer in that code. The timer would have to be added, and
>>>>> careful consideration would have to be given to exactly how that was
>>>>> implemented.
>>>>>
>>>>> So in other words, you would, or should write a completely new kernel
>>>>> module, that is meant to replace what already exists - As an option.
>>>>>
>>>>> On Sun, Apr 17, 2016 at 10:25 PM, evilwulfie <
>>>>> <mailto:evilwul...@gmail.com>evilwul...@gmail.com
>>>>> <mailto:evilwul...@gmail.com>> wrote:
>>>>> Where in the code do you set that timer ?
>>>>>
>>>>>
>>>>>
>>>>> On 4/17/2016 7:50 PM, John Syne wrote:
>>>>>> One more thing, the power down sequence uses the RTC framework
>>>>>> (described earlier in this thread), so it will be possible to set a
>>>>>> timer for the shutdown and the wait for the power to return event to
>>>>>> cancel the timer. If the power on event does not occur, the shutdown
>>>>>> will occur.
>>>>>>
>>>>>> Regards,
>>>>>> John
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>> On Apr 17, 2016, at 7:18 PM, evilwulfie <
>>>>>>> <mailto:evilwul...@gmail.com>evilwul...@gmail.com
>>>>>>> <mailto:evilwul...@gmail.com>> wrote:
>>>>>>>
>>>>>>> Interesting. Too bad if you want the battery to act as a UPS it cant
>>>>>>> some how notify the kernel that AC has been removed
>>>>>>> and have a routine to just chill a while to see if power comes back.
>>>>>>>
>>>>>>> Be nice to have a variable that is user settable for the time between
>>>>>>> loss of AC and shutdown.
>>>>>>>
>>>>>>> As it is now it sees the AC removed, shuts down and no easy way to
>>>>>>> restart on power restored. Requiring some other IC to monitor power
>>>>>>> and then press the pwr_but to restart the processor.
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> On 4/17/2016 7:10 PM, John Syne wrote:
>>>>>>>> Yep, it is in the BB kernel:
>>>>>>>>
>>>>>>>>
>>>>>>>> <https://github.com/RobertCNelson/bb-kernel/blob/am33x-v4.1/patches/beaglebone/dts/0006-tps65217-Enable-KEY_POWER-press-on-AC-loss-PWR_BUT.patch>https://github.com/RobertCNelson/bb-kernel/blob/am33x-v4.1/patches/beaglebone/dts/0006-tps65217-Enable-KEY_POWER-press-on-AC-loss-PWR_BUT.patch
>>>>>>>>
>>>>>>>> <https://github.com/RobertCNelson/bb-kernel/blob/am33x-v4.1/patches/beaglebone/dts/0006-tps65217-Enable-KEY_POWER-press-on-AC-loss-PWR_BUT.patch>
>>>>>>>>
>>>>>>>> So again, on line 164 is the Interrupt routing. It is this line:
>>>>>>>>
>>>>>>>> + input_report_key(tps->pwr_but, KEY_POWER,
>>>>>>>>
>>>>>>>> + ~status_reg & TPS65217_STATUS_ACPWR);
>>>>>>>> that send a power button pressed as an input key when the AC 5V power
>>>>>>>> is removed.
>>>>>>>>
>>>>>>>> Regards,
>>>>>>>> John
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>> On Apr 17, 2016, at 4:52 PM, William Hermans <
>>>>>>>>> <mailto:yyrk...@gmail.com>yyrk...@gmail.com
>>>>>>>>> <mailto:yyrk...@gmail.com>> wrote:
>>>>>>>>>
>>>>>>>>> The real reason why our source trees do not match up. My source tree
>>>>>>>>> is based on 4.1.x, and yours seems to be 3.8.x. The patch you showed
>>>>>>>>> above would probably botch up my source tree . . .
>>>>>>>>>
>>>>>>>>> On Sun, Apr 17, 2016 at 4:33 PM, William Hermans <
>>>>>>>>> <mailto:yyrk...@gmail.com>yyrk...@gmail.com
>>>>>>>>> <mailto:yyrk...@gmail.com>> wrote:
>>>>>>>>> Yeah I recognize that code from source code not written by TI
>>>>>>>>> employees. The file is called tps65217_charger.c, and is written by
>>>>>>>>> an employee of another company.
>>>>>>>>>
>>>>>>>>> Anyway, I think we're going to blow this off. The idea was to wait
>>>>>>>>> around without power for 5 minutes, to see if power comes back up.
>>>>>>>>> Before issuing a shutdown. Then, on the power up end, using a simple
>>>>>>>>> R/C circuit to ramp up voltage to 5v over a specific time period.
>>>>>>>>>
>>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> <https://www.avast.com/en-us/lp-safe-emailing-2109?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient&utm_term=oa-2109-v2-a>
>>>>>>> Virus-free.
>>>>>>> <https://www.avast.com/en-us/lp-safe-emailing-2109?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient&utm_term=oa-2109-v2-a>www.avast.com
>>>>>>> <http://www.avast.com/>
>>>>>>>
>>>>>>> --
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>>>>>>> <http://beagleboard.org/discuss>http://beagleboard.org/discuss
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>>>>>> For more options, visit
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>>>>>
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>>>>> Virus-free.
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>>>>> <http://www.avast.com/>
>>>>>
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