From: Sebastian Reichel <sre@kernel.org>
To: Tim Harvey <tharvey@gateworks.com>
Cc: linux-pm@vger.kernel.org, rtc-linux@googlegroups.com
Subject: Re: where in sysfs should I put the ability to power down a board for a specific time?
Date: Tue, 20 Oct 2015 23:21:27 +0200 [thread overview]
Message-ID: <20151020212127.GA25882@earth> (raw)
In-Reply-To: <CAJ+vNU3V-i2uJTpyE_swqjCvjVr+-j1+jjp+WuZLDA8Os74y=g@mail.gmail.com>
[-- Attachment #1: Type: text/plain, Size: 1009 bytes --]
Hi,
On Tue, Oct 20, 2015 at 08:12:09AM -0700, Tim Harvey wrote:
> There is a system controller [1] on a set of embedded boards I support
> that allows disabling the board's primary power supply. It can disable
> it (until a physical pushbutton event occurs) and/or disable it for a
> certain number of seconds (up to 2^16 seconds).
>
> I've been in the process of writing a mfd driver to fully support this
> device and I'm a bit stumped on how to handle the power management
> capabilities.
>
> What is the correct API for this type of device in sysfs? I'm thinking
> it needs a power-supply class driver, but after looking over the docs
> and code I'm not seeing examples of similar devices. Can anyone point
> me to an example or provide some suggestions?
Usually this is an RTC feature exposed as wakealarm. See for example
this article for the description of the userspace interface:
https://www.linux.com/learn/docs/672849-wake-up-linux-with-an-rtc-alarm-clock
-- Sebastian
[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 819 bytes --]
next prev parent reply other threads:[~2015-10-20 21:21 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-20 15:12 where in sysfs should I put the ability to power down a board for a specific time? Tim Harvey
2015-10-20 21:21 ` Sebastian Reichel [this message]
2015-10-24 2:12 ` [rtc-linux] " Alexandre Belloni
2015-10-27 14:55 ` Tim Harvey
2015-10-27 15:29 ` Alexandre Belloni
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20151020212127.GA25882@earth \
--to=sre@kernel.org \
--cc=linux-pm@vger.kernel.org \
--cc=rtc-linux@googlegroups.com \
--cc=tharvey@gateworks.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).