/*
 * kernel/power/autosleep.c
 *
 * Opportunistic sleep support.
 *
 * Copyright (C) 2012 Rafael J. Wysocki <rjw@sisk.pl>
 */

#include <linux/device.h>
#include <linux/mutex.h>
#include <linux/pm_wakeup.h>

#include "power.h"

static suspend_state_t autosleep_state;
static struct workqueue_struct *autosleep_wq;
/*
 * Note: it is only safe to mutex_lock(&autosleep_lock) if a wakeup_source
 * is active, otherwise a deadlock with try_to_suspend() is possible.
 * Alternatively mutex_lock_interruptible() can be used.  This will then fail
 * if an auto_sleep cycle tries to freeze processes.
 */
static DEFINE_MUTEX(autosleep_lock);
static struct wakeup_source *autosleep_ws;

static void try_to_suspend(struct work_struct *work)
{
	unsigned int initial_count, final_count;

	if (!pm_get_wakeup_count(&initial_count, true))
		goto out;

	mutex_lock(&autosleep_lock);

	if (!pm_save_wakeup_count(initial_count) ||
		system_state != SYSTEM_RUNNING) {
		mutex_unlock(&autosleep_lock);
		goto out;
	}

	if (autosleep_state == PM_SUSPEND_ON) {
		mutex_unlock(&autosleep_lock);
		return;
	}
	if (autosleep_state >= PM_SUSPEND_MAX)
		hibernate();
	else
		pm_suspend(autosleep_state);

	mutex_unlock(&autosleep_lock);

	if (!pm_get_wakeup_count(&final_count, false))
		goto out;

	/*
	 * If the wakeup occured for an unknown reason, wait to prevent the
	 * system from trying to suspend and waking up in a tight loop.
	 */
	if (final_count == initial_count)
		schedule_timeout_uninterruptible(HZ / 2);

 out:
	queue_up_suspend_work();
}

static DECLARE_WORK(suspend_work, try_to_suspend);

void queue_up_suspend_work(void)
{
	if (autosleep_state > PM_SUSPEND_ON)
		queue_work(autosleep_wq, &suspend_work);
}

suspend_state_t pm_autosleep_state(void)
{
	return autosleep_state;
}

int pm_autosleep_lock(void)
{
	return mutex_lock_interruptible(&autosleep_lock);
}

void pm_autosleep_unlock(void)
{
	mutex_unlock(&autosleep_lock);
}

int pm_autosleep_set_state(suspend_state_t state)
{

#ifndef CONFIG_HIBERNATION
	if (state >= PM_SUSPEND_MAX)
		return -EINVAL;
#endif

	__pm_stay_awake(autosleep_ws);

	mutex_lock(&autosleep_lock);

	autosleep_state = state;

	__pm_relax(autosleep_ws);

	if (state > PM_SUSPEND_ON) {
		pm_wakep_autosleep_enabled(true);
		queue_up_suspend_work();
	} else {
		pm_wakep_autosleep_enabled(false);
	}

	mutex_unlock(&autosleep_lock);
	return 0;
}

int __init pm_autosleep_init(void)
{
	autosleep_ws = wakeup_source_register("autosleep");
	if (!autosleep_ws)
		return -ENOMEM;

	autosleep_wq = alloc_ordered_workqueue("autosleep", 0);
	if (autosleep_wq)
		return 0;

	wakeup_source_unregister(autosleep_ws);
	return -ENOMEM;
}
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=72df5eba704252e54b5b19395cb938f8bb55cab8'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers?id=72df5eba704252e54b5b19395cb938f8bb55cab8'>drivers</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb?id=72df5eba704252e54b5b19395cb938f8bb55cab8'>usb</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/host?id=72df5eba704252e54b5b19395cb938f8bb55cab8'>host</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/host/r8a66597-hcd.c?id=72df5eba704252e54b5b19395cb938f8bb55cab8'>r8a66597-hcd.c</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='72df5eba704252e54b5b19395cb938f8bb55cab8'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-02-06 14:37:55 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-02-06 14:37:55 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/host/r8a66597-hcd.c?id=72df5eba704252e54b5b19395cb938f8bb55cab8'>72df5eba704252e54b5b19395cb938f8bb55cab8</a> (<a href='/cgit.cgi/linux/net-next.git/patch/drivers/usb/host/r8a66597-hcd.c?id=72df5eba704252e54b5b19395cb938f8bb55cab8'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=72df5eba704252e54b5b19395cb938f8bb55cab8'>9b9dd6aa0cd3b6cda738de32dd05075e6e66bab1</a> /<a href='/cgit.cgi/linux/net-next.git/tree/drivers/usb/host/r8a66597-hcd.c?id=72df5eba704252e54b5b19395cb938f8bb55cab8'>drivers/usb/host/r8a66597-hcd.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/host/r8a66597-hcd.c?id=396bf4cd835e62d70fad4a03a8963e61f19021f2'>396bf4cd835e62d70fad4a03a8963e61f19021f2</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/host/r8a66597-hcd.c?id=72df5eba704252e54b5b19395cb938f8bb55cab8&amp;id2=396bf4cd835e62d70fad4a03a8963e61f19021f2'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/host/r8a66597-hcd.c?id=f9f96fc10c09ca16e336854c08bc1563eed97985'>f9f96fc10c09ca16e336854c08bc1563eed97985</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/host/r8a66597-hcd.c?id=72df5eba704252e54b5b19395cb938f8bb55cab8&amp;id2=f9f96fc10c09ca16e336854c08bc1563eed97985'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge tag 'media/v4.10-3' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media</div><div class='commit-msg'>Pull media fixes from Mauro Carvalho Chehab:
 "A few documentation fixes at CEC (with got promoted from staging for
  4.10), and one fix on its core."

* tag 'media/v4.10-3' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media:
  [media] cec: fix wrong last_la determination
  [media] cec-intro.rst: mention the v4l-utils package and CEC utilities
  [media] cec rst: remove "This API is not yet finalized" notice
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=72df5eba704252e54b5b19395cb938f8bb55cab8'>Diffstat</a> (limited to 'drivers/usb/host/r8a66597-hcd.c')</div><table summary='diffstat' class='diffstat'>