82428b62aa
This patch includes various tweaks in the messaging that appears during
system pm state transitions:
* Warn about certain illegal calls in the device tree, like resuming
child before parent or suspending parent before child. This could
happen easily enough through sysfs, or in some cases when drivers
use device_pm_set_parent().
* Be more consistent about dev_dbg() tracing ... do it for resume() and
shutdown() too, and never if the driver doesn't have that method.
* Say which type of system sleep state is being entered.
Except for the warnings, these only affect debug messaging.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
121 lines
2.3 KiB
C
121 lines
2.3 KiB
C
/*
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* resume.c - Functions for waking devices up.
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*
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* Copyright (c) 2003 Patrick Mochel
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* Copyright (c) 2003 Open Source Development Labs
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*
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* This file is released under the GPLv2
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*
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*/
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#include <linux/device.h>
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#include "power.h"
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extern int sysdev_resume(void);
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/**
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* resume_device - Restore state for one device.
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* @dev: Device.
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*
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*/
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int resume_device(struct device * dev)
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{
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if (dev->power.pm_parent
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&& dev->power.pm_parent->power.power_state) {
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dev_err(dev, "PM: resume from %d, parent %s still %d\n",
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dev->power.power_state,
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dev->power.pm_parent->bus_id,
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dev->power.pm_parent->power.power_state);
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}
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if (dev->bus && dev->bus->resume) {
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dev_dbg(dev,"resuming\n");
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return dev->bus->resume(dev);
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}
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return 0;
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}
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void dpm_resume(void)
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{
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down(&dpm_list_sem);
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while(!list_empty(&dpm_off)) {
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struct list_head * entry = dpm_off.next;
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struct device * dev = to_device(entry);
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get_device(dev);
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list_del_init(entry);
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list_add_tail(entry, &dpm_active);
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up(&dpm_list_sem);
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if (!dev->power.prev_state)
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resume_device(dev);
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down(&dpm_list_sem);
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put_device(dev);
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}
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up(&dpm_list_sem);
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}
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/**
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* device_resume - Restore state of each device in system.
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*
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* Walk the dpm_off list, remove each entry, resume the device,
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* then add it to the dpm_active list.
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*/
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void device_resume(void)
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{
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down(&dpm_sem);
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dpm_resume();
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up(&dpm_sem);
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}
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EXPORT_SYMBOL_GPL(device_resume);
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/**
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* device_power_up_irq - Power on some devices.
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*
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* Walk the dpm_off_irq list and power each device up. This
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* is used for devices that required they be powered down with
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* interrupts disabled. As devices are powered on, they are moved to
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* the dpm_suspended list.
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*
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* Interrupts must be disabled when calling this.
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*/
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void dpm_power_up(void)
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{
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while(!list_empty(&dpm_off_irq)) {
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struct list_head * entry = dpm_off_irq.next;
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struct device * dev = to_device(entry);
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get_device(dev);
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list_del_init(entry);
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list_add_tail(entry, &dpm_active);
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resume_device(dev);
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put_device(dev);
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}
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}
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/**
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* device_pm_power_up - Turn on all devices that need special attention.
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*
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* Power on system devices then devices that required we shut them down
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* with interrupts disabled.
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* Called with interrupts disabled.
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*/
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void device_power_up(void)
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{
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sysdev_resume();
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dpm_power_up();
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}
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EXPORT_SYMBOL_GPL(device_power_up);
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