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Date: Thu, 16 Sep 2010 21:19:18 +0200
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: "Linux-pm mailing list" <linux-pm@...ts.linux-foundation.org>
Cc: Alan Stern <stern@...land.harvard.edu>,
LKML <linux-kernel@...r.kernel.org>
Subject: [RFC][PATCH] PM: Rename drivers/base/power/main.c to drivers/base/power/sleep.c
From: Rafael J. Wysocki <rjw@...k.pl>
The file drivers/base/power/main.c only contains code that is used
during system-wide power transitions to sleep states and back to the
working state. Moreover, it's only built when CONFIG_PM_SLEEP is
set, so the name "main.c" is kind of misleading. Rename it to
drivers/base/power/sleep.c to make things more clear.
Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
---
drivers/base/power/Makefile | 2
drivers/base/power/main.c | 1094 --------------------------------------------
drivers/base/power/power.h | 2
drivers/base/power/sleep.c | 1094 ++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 1096 insertions(+), 1096 deletions(-)
Index: linux-2.6/drivers/base/power/Makefile
===================================================================
--- linux-2.6.orig/drivers/base/power/Makefile
+++ linux-2.6/drivers/base/power/Makefile
@@ -1,5 +1,5 @@
obj-$(CONFIG_PM) += sysfs.o
-obj-$(CONFIG_PM_SLEEP) += main.o wakeup.o
+obj-$(CONFIG_PM_SLEEP) += sleep.o wakeup.o
obj-$(CONFIG_PM_RUNTIME) += runtime.o
obj-$(CONFIG_PM_OPS) += generic_ops.o
obj-$(CONFIG_PM_TRACE_RTC) += trace.o
Index: linux-2.6/drivers/base/power/main.c
===================================================================
--- linux-2.6.orig/drivers/base/power/main.c
+++ /dev/null
@@ -1,1094 +0,0 @@
-/*
- * drivers/base/power/main.c - Where the driver meets power management.
- *
- * Copyright (c) 2003 Patrick Mochel
- * Copyright (c) 2003 Open Source Development Lab
- *
- * This file is released under the GPLv2
- *
- *
- * The driver model core calls device_pm_add() when a device is registered.
- * This will intialize the embedded device_pm_info object in the device
- * and add it to the list of power-controlled devices. sysfs entries for
- * controlling device power management will also be added.
- *
- * A separate list is used for keeping track of power info, because the power
- * domain dependencies may differ from the ancestral dependencies that the
- * subsystem list maintains.
- */
-
-#include <linux/device.h>
-#include <linux/kallsyms.h>
-#include <linux/mutex.h>
-#include <linux/pm.h>
-#include <linux/pm_runtime.h>
-#include <linux/resume-trace.h>
-#include <linux/interrupt.h>
-#include <linux/sched.h>
-#include <linux/async.h>
-
-#include "../base.h"
-#include "power.h"
-
-/*
- * The entries in the dpm_list list are in a depth first order, simply
- * because children are guaranteed to be discovered after parents, and
- * are inserted at the back of the list on discovery.
- *
- * Since device_pm_add() may be called with a device lock held,
- * we must never try to acquire a device lock while holding
- * dpm_list_mutex.
- */
-
-LIST_HEAD(dpm_list);
-
-static DEFINE_MUTEX(dpm_list_mtx);
-static pm_message_t pm_transition;
-
-/*
- * Set once the preparation of devices for a PM transition has started, reset
- * before starting to resume devices. Protected by dpm_list_mtx.
- */
-static bool transition_started;
-
-/**
- * device_pm_init - Initialize the PM-related part of a device object.
- * @dev: Device object being initialized.
- */
-void device_pm_init(struct device *dev)
-{
- dev->power.status = DPM_ON;
- init_completion(&dev->power.completion);
- complete_all(&dev->power.completion);
- dev->power.wakeup = NULL;
- spin_lock_init(&dev->power.lock);
- pm_runtime_init(dev);
-}
-
-/**
- * device_pm_lock - Lock the list of active devices used by the PM core.
- */
-void device_pm_lock(void)
-{
- mutex_lock(&dpm_list_mtx);
-}
-
-/**
- * device_pm_unlock - Unlock the list of active devices used by the PM core.
- */
-void device_pm_unlock(void)
-{
- mutex_unlock(&dpm_list_mtx);
-}
-
-/**
- * device_pm_add - Add a device to the PM core's list of active devices.
- * @dev: Device to add to the list.
- */
-void device_pm_add(struct device *dev)
-{
- pr_debug("PM: Adding info for %s:%s\n",
- dev->bus ? dev->bus->name : "No Bus",
- kobject_name(&dev->kobj));
- mutex_lock(&dpm_list_mtx);
- if (dev->parent) {
- if (dev->parent->power.status >= DPM_SUSPENDING)
- dev_warn(dev, "parent %s should not be sleeping\n",
- dev_name(dev->parent));
- } else if (transition_started) {
- /*
- * We refuse to register parentless devices while a PM
- * transition is in progress in order to avoid leaving them
- * unhandled down the road
- */
- dev_WARN(dev, "Parentless device registered during a PM transaction\n");
- }
-
- list_add_tail(&dev->power.entry, &dpm_list);
- mutex_unlock(&dpm_list_mtx);
-}
-
-/**
- * device_pm_remove - Remove a device from the PM core's list of active devices.
- * @dev: Device to be removed from the list.
- */
-void device_pm_remove(struct device *dev)
-{
- pr_debug("PM: Removing info for %s:%s\n",
- dev->bus ? dev->bus->name : "No Bus",
- kobject_name(&dev->kobj));
- complete_all(&dev->power.completion);
- mutex_lock(&dpm_list_mtx);
- list_del_init(&dev->power.entry);
- mutex_unlock(&dpm_list_mtx);
- device_wakeup_disable(dev);
- pm_runtime_remove(dev);
-}
-
-/**
- * device_pm_move_before - Move device in the PM core's list of active devices.
- * @deva: Device to move in dpm_list.
- * @devb: Device @deva should come before.
- */
-void device_pm_move_before(struct device *deva, struct device *devb)
-{
- pr_debug("PM: Moving %s:%s before %s:%s\n",
- deva->bus ? deva->bus->name : "No Bus",
- kobject_name(&deva->kobj),
- devb->bus ? devb->bus->name : "No Bus",
- kobject_name(&devb->kobj));
- /* Delete deva from dpm_list and reinsert before devb. */
- list_move_tail(&deva->power.entry, &devb->power.entry);
-}
-
-/**
- * device_pm_move_after - Move device in the PM core's list of active devices.
- * @deva: Device to move in dpm_list.
- * @devb: Device @deva should come after.
- */
-void device_pm_move_after(struct device *deva, struct device *devb)
-{
- pr_debug("PM: Moving %s:%s after %s:%s\n",
- deva->bus ? deva->bus->name : "No Bus",
- kobject_name(&deva->kobj),
- devb->bus ? devb->bus->name : "No Bus",
- kobject_name(&devb->kobj));
- /* Delete deva from dpm_list and reinsert after devb. */
- list_move(&deva->power.entry, &devb->power.entry);
-}
-
-/**
- * device_pm_move_last - Move device to end of the PM core's list of devices.
- * @dev: Device to move in dpm_list.
- */
-void device_pm_move_last(struct device *dev)
-{
- pr_debug("PM: Moving %s:%s to end of list\n",
- dev->bus ? dev->bus->name : "No Bus",
- kobject_name(&dev->kobj));
- list_move_tail(&dev->power.entry, &dpm_list);
-}
-
-static ktime_t initcall_debug_start(struct device *dev)
-{
- ktime_t calltime = ktime_set(0, 0);
-
- if (initcall_debug) {
- pr_info("calling %s+ @ %i\n",
- dev_name(dev), task_pid_nr(current));
- calltime = ktime_get();
- }
-
- return calltime;
-}
-
-static void initcall_debug_report(struct device *dev, ktime_t calltime,
- int error)
-{
- ktime_t delta, rettime;
-
- if (initcall_debug) {
- rettime = ktime_get();
- delta = ktime_sub(rettime, calltime);
- pr_info("call %s+ returned %d after %Ld usecs\n", dev_name(dev),
- error, (unsigned long long)ktime_to_ns(delta) >> 10);
- }
-}
-
-/**
- * dpm_wait - Wait for a PM operation to complete.
- * @dev: Device to wait for.
- * @async: If unset, wait only if the device's power.async_suspend flag is set.
- */
-static void dpm_wait(struct device *dev, bool async)
-{
- if (!dev)
- return;
-
- if (async || (pm_async_enabled && dev->power.async_suspend))
- wait_for_completion(&dev->power.completion);
-}
-
-static int dpm_wait_fn(struct device *dev, void *async_ptr)
-{
- dpm_wait(dev, *((bool *)async_ptr));
- return 0;
-}
-
-static void dpm_wait_for_children(struct device *dev, bool async)
-{
- device_for_each_child(dev, &async, dpm_wait_fn);
-}
-
-/**
- * pm_op - Execute the PM operation appropriate for given PM event.
- * @dev: Device to handle.
- * @ops: PM operations to choose from.
- * @state: PM transition of the system being carried out.
- */
-static int pm_op(struct device *dev,
- const struct dev_pm_ops *ops,
- pm_message_t state)
-{
- int error = 0;
- ktime_t calltime;
-
- calltime = initcall_debug_start(dev);
-
- switch (state.event) {
-#ifdef CONFIG_SUSPEND
- case PM_EVENT_SUSPEND:
- if (ops->suspend) {
- error = ops->suspend(dev);
- suspend_report_result(ops->suspend, error);
- }
- break;
- case PM_EVENT_RESUME:
- if (ops->resume) {
- error = ops->resume(dev);
- suspend_report_result(ops->resume, error);
- }
- break;
-#endif /* CONFIG_SUSPEND */
-#ifdef CONFIG_HIBERNATION
- case PM_EVENT_FREEZE:
- case PM_EVENT_QUIESCE:
- if (ops->freeze) {
- error = ops->freeze(dev);
- suspend_report_result(ops->freeze, error);
- }
- break;
- case PM_EVENT_HIBERNATE:
- if (ops->poweroff) {
- error = ops->poweroff(dev);
- suspend_report_result(ops->poweroff, error);
- }
- break;
- case PM_EVENT_THAW:
- case PM_EVENT_RECOVER:
- if (ops->thaw) {
- error = ops->thaw(dev);
- suspend_report_result(ops->thaw, error);
- }
- break;
- case PM_EVENT_RESTORE:
- if (ops->restore) {
- error = ops->restore(dev);
- suspend_report_result(ops->restore, error);
- }
- break;
-#endif /* CONFIG_HIBERNATION */
- default:
- error = -EINVAL;
- }
-
- initcall_debug_report(dev, calltime, error);
-
- return error;
-}
-
-/**
- * pm_noirq_op - Execute the PM operation appropriate for given PM event.
- * @dev: Device to handle.
- * @ops: PM operations to choose from.
- * @state: PM transition of the system being carried out.
- *
- * The driver of @dev will not receive interrupts while this function is being
- * executed.
- */
-static int pm_noirq_op(struct device *dev,
- const struct dev_pm_ops *ops,
- pm_message_t state)
-{
- int error = 0;
- ktime_t calltime, delta, rettime;
-
- if (initcall_debug) {
- pr_info("calling %s+ @ %i, parent: %s\n",
- dev_name(dev), task_pid_nr(current),
- dev->parent ? dev_name(dev->parent) : "none");
- calltime = ktime_get();
- }
-
- switch (state.event) {
-#ifdef CONFIG_SUSPEND
- case PM_EVENT_SUSPEND:
- if (ops->suspend_noirq) {
- error = ops->suspend_noirq(dev);
- suspend_report_result(ops->suspend_noirq, error);
- }
- break;
- case PM_EVENT_RESUME:
- if (ops->resume_noirq) {
- error = ops->resume_noirq(dev);
- suspend_report_result(ops->resume_noirq, error);
- }
- break;
-#endif /* CONFIG_SUSPEND */
-#ifdef CONFIG_HIBERNATION
- case PM_EVENT_FREEZE:
- case PM_EVENT_QUIESCE:
- if (ops->freeze_noirq) {
- error = ops->freeze_noirq(dev);
- suspend_report_result(ops->freeze_noirq, error);
- }
- break;
- case PM_EVENT_HIBERNATE:
- if (ops->poweroff_noirq) {
- error = ops->poweroff_noirq(dev);
- suspend_report_result(ops->poweroff_noirq, error);
- }
- break;
- case PM_EVENT_THAW:
- case PM_EVENT_RECOVER:
- if (ops->thaw_noirq) {
- error = ops->thaw_noirq(dev);
- suspend_report_result(ops->thaw_noirq, error);
- }
- break;
- case PM_EVENT_RESTORE:
- if (ops->restore_noirq) {
- error = ops->restore_noirq(dev);
- suspend_report_result(ops->restore_noirq, error);
- }
- break;
-#endif /* CONFIG_HIBERNATION */
- default:
- error = -EINVAL;
- }
-
- if (initcall_debug) {
- rettime = ktime_get();
- delta = ktime_sub(rettime, calltime);
- printk("initcall %s_i+ returned %d after %Ld usecs\n",
- dev_name(dev), error,
- (unsigned long long)ktime_to_ns(delta) >> 10);
- }
-
- return error;
-}
-
-static char *pm_verb(int event)
-{
- switch (event) {
- case PM_EVENT_SUSPEND:
- return "suspend";
- case PM_EVENT_RESUME:
- return "resume";
- case PM_EVENT_FREEZE:
- return "freeze";
- case PM_EVENT_QUIESCE:
- return "quiesce";
- case PM_EVENT_HIBERNATE:
- return "hibernate";
- case PM_EVENT_THAW:
- return "thaw";
- case PM_EVENT_RESTORE:
- return "restore";
- case PM_EVENT_RECOVER:
- return "recover";
- default:
- return "(unknown PM event)";
- }
-}
-
-static void pm_dev_dbg(struct device *dev, pm_message_t state, char *info)
-{
- dev_dbg(dev, "%s%s%s\n", info, pm_verb(state.event),
- ((state.event & PM_EVENT_SLEEP) && device_may_wakeup(dev)) ?
- ", may wakeup" : "");
-}
-
-static void pm_dev_err(struct device *dev, pm_message_t state, char *info,
- int error)
-{
- printk(KERN_ERR "PM: Device %s failed to %s%s: error %d\n",
- kobject_name(&dev->kobj), pm_verb(state.event), info, error);
-}
-
-static void dpm_show_time(ktime_t starttime, pm_message_t state, char *info)
-{
- ktime_t calltime;
- s64 usecs64;
- int usecs;
-
- calltime = ktime_get();
- usecs64 = ktime_to_ns(ktime_sub(calltime, starttime));
- do_div(usecs64, NSEC_PER_USEC);
- usecs = usecs64;
- if (usecs == 0)
- usecs = 1;
- pr_info("PM: %s%s%s of devices complete after %ld.%03ld msecs\n",
- info ?: "", info ? " " : "", pm_verb(state.event),
- usecs / USEC_PER_MSEC, usecs % USEC_PER_MSEC);
-}
-
-/*------------------------- Resume routines -------------------------*/
-
-/**
- * device_resume_noirq - Execute an "early resume" callback for given device.
- * @dev: Device to handle.
- * @state: PM transition of the system being carried out.
- *
- * The driver of @dev will not receive interrupts while this function is being
- * executed.
- */
-static int device_resume_noirq(struct device *dev, pm_message_t state)
-{
- int error = 0;
-
- TRACE_DEVICE(dev);
- TRACE_RESUME(0);
-
- if (dev->bus && dev->bus->pm) {
- pm_dev_dbg(dev, state, "EARLY ");
- error = pm_noirq_op(dev, dev->bus->pm, state);
- if (error)
- goto End;
- }
-
- if (dev->type && dev->type->pm) {
- pm_dev_dbg(dev, state, "EARLY type ");
- error = pm_noirq_op(dev, dev->type->pm, state);
- if (error)
- goto End;
- }
-
- if (dev->class && dev->class->pm) {
- pm_dev_dbg(dev, state, "EARLY class ");
- error = pm_noirq_op(dev, dev->class->pm, state);
- }
-
-End:
- TRACE_RESUME(error);
- return error;
-}
-
-/**
- * dpm_resume_noirq - Execute "early resume" callbacks for non-sysdev devices.
- * @state: PM transition of the system being carried out.
- *
- * Call the "noirq" resume handlers for all devices marked as DPM_OFF_IRQ and
- * enable device drivers to receive interrupts.
- */
-void dpm_resume_noirq(pm_message_t state)
-{
- struct device *dev;
- ktime_t starttime = ktime_get();
-
- mutex_lock(&dpm_list_mtx);
- transition_started = false;
- list_for_each_entry(dev, &dpm_list, power.entry)
- if (dev->power.status > DPM_OFF) {
- int error;
-
- dev->power.status = DPM_OFF;
- error = device_resume_noirq(dev, state);
- if (error)
- pm_dev_err(dev, state, " early", error);
- }
- mutex_unlock(&dpm_list_mtx);
- dpm_show_time(starttime, state, "early");
- resume_device_irqs();
-}
-EXPORT_SYMBOL_GPL(dpm_resume_noirq);
-
-/**
- * legacy_resume - Execute a legacy (bus or class) resume callback for device.
- * @dev: Device to resume.
- * @cb: Resume callback to execute.
- */
-static int legacy_resume(struct device *dev, int (*cb)(struct device *dev))
-{
- int error;
- ktime_t calltime;
-
- calltime = initcall_debug_start(dev);
-
- error = cb(dev);
- suspend_report_result(cb, error);
-
- initcall_debug_report(dev, calltime, error);
-
- return error;
-}
-
-/**
- * device_resume - Execute "resume" callbacks for given device.
- * @dev: Device to handle.
- * @state: PM transition of the system being carried out.
- * @async: If true, the device is being resumed asynchronously.
- */
-static int device_resume(struct device *dev, pm_message_t state, bool async)
-{
- int error = 0;
-
- TRACE_DEVICE(dev);
- TRACE_RESUME(0);
-
- dpm_wait(dev->parent, async);
- device_lock(dev);
-
- dev->power.status = DPM_RESUMING;
-
- if (dev->bus) {
- if (dev->bus->pm) {
- pm_dev_dbg(dev, state, "");
- error = pm_op(dev, dev->bus->pm, state);
- } else if (dev->bus->resume) {
- pm_dev_dbg(dev, state, "legacy ");
- error = legacy_resume(dev, dev->bus->resume);
- }
- if (error)
- goto End;
- }
-
- if (dev->type) {
- if (dev->type->pm) {
- pm_dev_dbg(dev, state, "type ");
- error = pm_op(dev, dev->type->pm, state);
- }
- if (error)
- goto End;
- }
-
- if (dev->class) {
- if (dev->class->pm) {
- pm_dev_dbg(dev, state, "class ");
- error = pm_op(dev, dev->class->pm, state);
- } else if (dev->class->resume) {
- pm_dev_dbg(dev, state, "legacy class ");
- error = legacy_resume(dev, dev->class->resume);
- }
- }
- End:
- device_unlock(dev);
- complete_all(&dev->power.completion);
-
- TRACE_RESUME(error);
- return error;
-}
-
-static void async_resume(void *data, async_cookie_t cookie)
-{
- struct device *dev = (struct device *)data;
- int error;
-
- error = device_resume(dev, pm_transition, true);
- if (error)
- pm_dev_err(dev, pm_transition, " async", error);
- put_device(dev);
-}
-
-static bool is_async(struct device *dev)
-{
- return dev->power.async_suspend && pm_async_enabled
- && !pm_trace_is_enabled();
-}
-
-/**
- * dpm_resume - Execute "resume" callbacks for non-sysdev devices.
- * @state: PM transition of the system being carried out.
- *
- * Execute the appropriate "resume" callback for all devices whose status
- * indicates that they are suspended.
- */
-static void dpm_resume(pm_message_t state)
-{
- struct list_head list;
- struct device *dev;
- ktime_t starttime = ktime_get();
-
- INIT_LIST_HEAD(&list);
- mutex_lock(&dpm_list_mtx);
- pm_transition = state;
-
- list_for_each_entry(dev, &dpm_list, power.entry) {
- if (dev->power.status < DPM_OFF)
- continue;
-
- INIT_COMPLETION(dev->power.completion);
- if (is_async(dev)) {
- get_device(dev);
- async_schedule(async_resume, dev);
- }
- }
-
- while (!list_empty(&dpm_list)) {
- dev = to_device(dpm_list.next);
- get_device(dev);
- if (dev->power.status >= DPM_OFF && !is_async(dev)) {
- int error;
-
- mutex_unlock(&dpm_list_mtx);
-
- error = device_resume(dev, state, false);
-
- mutex_lock(&dpm_list_mtx);
- if (error)
- pm_dev_err(dev, state, "", error);
- } else if (dev->power.status == DPM_SUSPENDING) {
- /* Allow new children of the device to be registered */
- dev->power.status = DPM_RESUMING;
- }
- if (!list_empty(&dev->power.entry))
- list_move_tail(&dev->power.entry, &list);
- put_device(dev);
- }
- list_splice(&list, &dpm_list);
- mutex_unlock(&dpm_list_mtx);
- async_synchronize_full();
- dpm_show_time(starttime, state, NULL);
-}
-
-/**
- * device_complete - Complete a PM transition for given device.
- * @dev: Device to handle.
- * @state: PM transition of the system being carried out.
- */
-static void device_complete(struct device *dev, pm_message_t state)
-{
- device_lock(dev);
-
- if (dev->class && dev->class->pm && dev->class->pm->complete) {
- pm_dev_dbg(dev, state, "completing class ");
- dev->class->pm->complete(dev);
- }
-
- if (dev->type && dev->type->pm && dev->type->pm->complete) {
- pm_dev_dbg(dev, state, "completing type ");
- dev->type->pm->complete(dev);
- }
-
- if (dev->bus && dev->bus->pm && dev->bus->pm->complete) {
- pm_dev_dbg(dev, state, "completing ");
- dev->bus->pm->complete(dev);
- }
-
- device_unlock(dev);
-}
-
-/**
- * dpm_complete - Complete a PM transition for all non-sysdev devices.
- * @state: PM transition of the system being carried out.
- *
- * Execute the ->complete() callbacks for all devices whose PM status is not
- * DPM_ON (this allows new devices to be registered).
- */
-static void dpm_complete(pm_message_t state)
-{
- struct list_head list;
-
- INIT_LIST_HEAD(&list);
- mutex_lock(&dpm_list_mtx);
- transition_started = false;
- while (!list_empty(&dpm_list)) {
- struct device *dev = to_device(dpm_list.prev);
-
- get_device(dev);
- if (dev->power.status > DPM_ON) {
- dev->power.status = DPM_ON;
- mutex_unlock(&dpm_list_mtx);
-
- device_complete(dev, state);
- pm_runtime_put_sync(dev);
-
- mutex_lock(&dpm_list_mtx);
- }
- if (!list_empty(&dev->power.entry))
- list_move(&dev->power.entry, &list);
- put_device(dev);
- }
- list_splice(&list, &dpm_list);
- mutex_unlock(&dpm_list_mtx);
-}
-
-/**
- * dpm_resume_end - Execute "resume" callbacks and complete system transition.
- * @state: PM transition of the system being carried out.
- *
- * Execute "resume" callbacks for all devices and complete the PM transition of
- * the system.
- */
-void dpm_resume_end(pm_message_t state)
-{
- might_sleep();
- dpm_resume(state);
- dpm_complete(state);
-}
-EXPORT_SYMBOL_GPL(dpm_resume_end);
-
-
-/*------------------------- Suspend routines -------------------------*/
-
-/**
- * resume_event - Return a "resume" message for given "suspend" sleep state.
- * @sleep_state: PM message representing a sleep state.
- *
- * Return a PM message representing the resume event corresponding to given
- * sleep state.
- */
-static pm_message_t resume_event(pm_message_t sleep_state)
-{
- switch (sleep_state.event) {
- case PM_EVENT_SUSPEND:
- return PMSG_RESUME;
- case PM_EVENT_FREEZE:
- case PM_EVENT_QUIESCE:
- return PMSG_RECOVER;
- case PM_EVENT_HIBERNATE:
- return PMSG_RESTORE;
- }
- return PMSG_ON;
-}
-
-/**
- * device_suspend_noirq - Execute a "late suspend" callback for given device.
- * @dev: Device to handle.
- * @state: PM transition of the system being carried out.
- *
- * The driver of @dev will not receive interrupts while this function is being
- * executed.
- */
-static int device_suspend_noirq(struct device *dev, pm_message_t state)
-{
- int error = 0;
-
- if (dev->class && dev->class->pm) {
- pm_dev_dbg(dev, state, "LATE class ");
- error = pm_noirq_op(dev, dev->class->pm, state);
- if (error)
- goto End;
- }
-
- if (dev->type && dev->type->pm) {
- pm_dev_dbg(dev, state, "LATE type ");
- error = pm_noirq_op(dev, dev->type->pm, state);
- if (error)
- goto End;
- }
-
- if (dev->bus && dev->bus->pm) {
- pm_dev_dbg(dev, state, "LATE ");
- error = pm_noirq_op(dev, dev->bus->pm, state);
- }
-
-End:
- return error;
-}
-
-/**
- * dpm_suspend_noirq - Execute "late suspend" callbacks for non-sysdev devices.
- * @state: PM transition of the system being carried out.
- *
- * Prevent device drivers from receiving interrupts and call the "noirq" suspend
- * handlers for all non-sysdev devices.
- */
-int dpm_suspend_noirq(pm_message_t state)
-{
- struct device *dev;
- ktime_t starttime = ktime_get();
- int error = 0;
-
- suspend_device_irqs();
- mutex_lock(&dpm_list_mtx);
- list_for_each_entry_reverse(dev, &dpm_list, power.entry) {
- error = device_suspend_noirq(dev, state);
- if (error) {
- pm_dev_err(dev, state, " late", error);
- break;
- }
- dev->power.status = DPM_OFF_IRQ;
- }
- mutex_unlock(&dpm_list_mtx);
- if (error)
- dpm_resume_noirq(resume_event(state));
- else
- dpm_show_time(starttime, state, "late");
- return error;
-}
-EXPORT_SYMBOL_GPL(dpm_suspend_noirq);
-
-/**
- * legacy_suspend - Execute a legacy (bus or class) suspend callback for device.
- * @dev: Device to suspend.
- * @state: PM transition of the system being carried out.
- * @cb: Suspend callback to execute.
- */
-static int legacy_suspend(struct device *dev, pm_message_t state,
- int (*cb)(struct device *dev, pm_message_t state))
-{
- int error;
- ktime_t calltime;
-
- calltime = initcall_debug_start(dev);
-
- error = cb(dev, state);
- suspend_report_result(cb, error);
-
- initcall_debug_report(dev, calltime, error);
-
- return error;
-}
-
-static int async_error;
-
-/**
- * device_suspend - Execute "suspend" callbacks for given device.
- * @dev: Device to handle.
- * @state: PM transition of the system being carried out.
- * @async: If true, the device is being suspended asynchronously.
- */
-static int __device_suspend(struct device *dev, pm_message_t state, bool async)
-{
- int error = 0;
-
- dpm_wait_for_children(dev, async);
- device_lock(dev);
-
- if (async_error)
- goto End;
-
- if (dev->class) {
- if (dev->class->pm) {
- pm_dev_dbg(dev, state, "class ");
- error = pm_op(dev, dev->class->pm, state);
- } else if (dev->class->suspend) {
- pm_dev_dbg(dev, state, "legacy class ");
- error = legacy_suspend(dev, state, dev->class->suspend);
- }
- if (error)
- goto End;
- }
-
- if (dev->type) {
- if (dev->type->pm) {
- pm_dev_dbg(dev, state, "type ");
- error = pm_op(dev, dev->type->pm, state);
- }
- if (error)
- goto End;
- }
-
- if (dev->bus) {
- if (dev->bus->pm) {
- pm_dev_dbg(dev, state, "");
- error = pm_op(dev, dev->bus->pm, state);
- } else if (dev->bus->suspend) {
- pm_dev_dbg(dev, state, "legacy ");
- error = legacy_suspend(dev, state, dev->bus->suspend);
- }
- }
-
- if (!error)
- dev->power.status = DPM_OFF;
-
- End:
- device_unlock(dev);
- complete_all(&dev->power.completion);
-
- return error;
-}
-
-static void async_suspend(void *data, async_cookie_t cookie)
-{
- struct device *dev = (struct device *)data;
- int error;
-
- error = __device_suspend(dev, pm_transition, true);
- if (error) {
- pm_dev_err(dev, pm_transition, " async", error);
- async_error = error;
- }
-
- put_device(dev);
-}
-
-static int device_suspend(struct device *dev)
-{
- INIT_COMPLETION(dev->power.completion);
-
- if (pm_async_enabled && dev->power.async_suspend) {
- get_device(dev);
- async_schedule(async_suspend, dev);
- return 0;
- }
-
- return __device_suspend(dev, pm_transition, false);
-}
-
-/**
- * dpm_suspend - Execute "suspend" callbacks for all non-sysdev devices.
- * @state: PM transition of the system being carried out.
- */
-static int dpm_suspend(pm_message_t state)
-{
- struct list_head list;
- ktime_t starttime = ktime_get();
- int error = 0;
-
- INIT_LIST_HEAD(&list);
- mutex_lock(&dpm_list_mtx);
- pm_transition = state;
- async_error = 0;
- while (!list_empty(&dpm_list)) {
- struct device *dev = to_device(dpm_list.prev);
-
- get_device(dev);
- mutex_unlock(&dpm_list_mtx);
-
- error = device_suspend(dev);
-
- mutex_lock(&dpm_list_mtx);
- if (error) {
- pm_dev_err(dev, state, "", error);
- put_device(dev);
- break;
- }
- if (!list_empty(&dev->power.entry))
- list_move(&dev->power.entry, &list);
- put_device(dev);
- if (async_error)
- break;
- }
- list_splice(&list, dpm_list.prev);
- mutex_unlock(&dpm_list_mtx);
- async_synchronize_full();
- if (!error)
- error = async_error;
- if (!error)
- dpm_show_time(starttime, state, NULL);
- return error;
-}
-
-/**
- * device_prepare - Prepare a device for system power transition.
- * @dev: Device to handle.
- * @state: PM transition of the system being carried out.
- *
- * Execute the ->prepare() callback(s) for given device. No new children of the
- * device may be registered after this function has returned.
- */
-static int device_prepare(struct device *dev, pm_message_t state)
-{
- int error = 0;
-
- device_lock(dev);
-
- if (dev->bus && dev->bus->pm && dev->bus->pm->prepare) {
- pm_dev_dbg(dev, state, "preparing ");
- error = dev->bus->pm->prepare(dev);
- suspend_report_result(dev->bus->pm->prepare, error);
- if (error)
- goto End;
- }
-
- if (dev->type && dev->type->pm && dev->type->pm->prepare) {
- pm_dev_dbg(dev, state, "preparing type ");
- error = dev->type->pm->prepare(dev);
- suspend_report_result(dev->type->pm->prepare, error);
- if (error)
- goto End;
- }
-
- if (dev->class && dev->class->pm && dev->class->pm->prepare) {
- pm_dev_dbg(dev, state, "preparing class ");
- error = dev->class->pm->prepare(dev);
- suspend_report_result(dev->class->pm->prepare, error);
- }
- End:
- device_unlock(dev);
-
- return error;
-}
-
-/**
- * dpm_prepare - Prepare all non-sysdev devices for a system PM transition.
- * @state: PM transition of the system being carried out.
- *
- * Execute the ->prepare() callback(s) for all devices.
- */
-static int dpm_prepare(pm_message_t state)
-{
- struct list_head list;
- int error = 0;
-
- INIT_LIST_HEAD(&list);
- mutex_lock(&dpm_list_mtx);
- transition_started = true;
- while (!list_empty(&dpm_list)) {
- struct device *dev = to_device(dpm_list.next);
-
- get_device(dev);
- dev->power.status = DPM_PREPARING;
- mutex_unlock(&dpm_list_mtx);
-
- pm_runtime_get_noresume(dev);
- if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) {
- /* Wake-up requested during system sleep transition. */
- pm_runtime_put_sync(dev);
- error = -EBUSY;
- } else {
- error = device_prepare(dev, state);
- }
-
- mutex_lock(&dpm_list_mtx);
- if (error) {
- dev->power.status = DPM_ON;
- if (error == -EAGAIN) {
- put_device(dev);
- error = 0;
- continue;
- }
- printk(KERN_ERR "PM: Failed to prepare device %s "
- "for power transition: error %d\n",
- kobject_name(&dev->kobj), error);
- put_device(dev);
- break;
- }
- dev->power.status = DPM_SUSPENDING;
- if (!list_empty(&dev->power.entry))
- list_move_tail(&dev->power.entry, &list);
- put_device(dev);
- }
- list_splice(&list, &dpm_list);
- mutex_unlock(&dpm_list_mtx);
- return error;
-}
-
-/**
- * dpm_suspend_start - Prepare devices for PM transition and suspend them.
- * @state: PM transition of the system being carried out.
- *
- * Prepare all non-sysdev devices for system PM transition and execute "suspend"
- * callbacks for them.
- */
-int dpm_suspend_start(pm_message_t state)
-{
- int error;
-
- might_sleep();
- error = dpm_prepare(state);
- if (!error)
- error = dpm_suspend(state);
- return error;
-}
-EXPORT_SYMBOL_GPL(dpm_suspend_start);
-
-void __suspend_report_result(const char *function, void *fn, int ret)
-{
- if (ret)
- printk(KERN_ERR "%s(): %pF returns %d\n", function, fn, ret);
-}
-EXPORT_SYMBOL_GPL(__suspend_report_result);
-
-/**
- * device_pm_wait_for_dev - Wait for suspend/resume of a device to complete.
- * @dev: Device to wait for.
- * @subordinate: Device that needs to wait for @dev.
- */
-void device_pm_wait_for_dev(struct device *subordinate, struct device *dev)
-{
- dpm_wait(dev, subordinate->power.async_suspend);
-}
-EXPORT_SYMBOL_GPL(device_pm_wait_for_dev);
Index: linux-2.6/drivers/base/power/sleep.c
===================================================================
--- /dev/null
+++ linux-2.6/drivers/base/power/sleep.c
@@ -0,0 +1,1094 @@
+/*
+ * drivers/base/power/sleep.c - Where the driver meets power management.
+ *
+ * Copyright (c) 2003 Patrick Mochel
+ * Copyright (c) 2003 Open Source Development Lab
+ *
+ * This file is released under the GPLv2
+ *
+ *
+ * The driver model core calls device_pm_add() when a device is registered.
+ * This will intialize the embedded device_pm_info object in the device
+ * and add it to the list of power-controlled devices. sysfs entries for
+ * controlling device power management will also be added.
+ *
+ * A separate list is used for keeping track of power info, because the power
+ * domain dependencies may differ from the ancestral dependencies that the
+ * subsystem list maintains.
+ */
+
+#include <linux/device.h>
+#include <linux/kallsyms.h>
+#include <linux/mutex.h>
+#include <linux/pm.h>
+#include <linux/pm_runtime.h>
+#include <linux/resume-trace.h>
+#include <linux/interrupt.h>
+#include <linux/sched.h>
+#include <linux/async.h>
+
+#include "../base.h"
+#include "power.h"
+
+/*
+ * The entries in the dpm_list list are in a depth first order, simply
+ * because children are guaranteed to be discovered after parents, and
+ * are inserted at the back of the list on discovery.
+ *
+ * Since device_pm_add() may be called with a device lock held,
+ * we must never try to acquire a device lock while holding
+ * dpm_list_mutex.
+ */
+
+LIST_HEAD(dpm_list);
+
+static DEFINE_MUTEX(dpm_list_mtx);
+static pm_message_t pm_transition;
+
+/*
+ * Set once the preparation of devices for a PM transition has started, reset
+ * before starting to resume devices. Protected by dpm_list_mtx.
+ */
+static bool transition_started;
+
+/**
+ * device_pm_init - Initialize the PM-related part of a device object.
+ * @dev: Device object being initialized.
+ */
+void device_pm_init(struct device *dev)
+{
+ dev->power.status = DPM_ON;
+ init_completion(&dev->power.completion);
+ complete_all(&dev->power.completion);
+ dev->power.wakeup = NULL;
+ spin_lock_init(&dev->power.lock);
+ pm_runtime_init(dev);
+}
+
+/**
+ * device_pm_lock - Lock the list of active devices used by the PM core.
+ */
+void device_pm_lock(void)
+{
+ mutex_lock(&dpm_list_mtx);
+}
+
+/**
+ * device_pm_unlock - Unlock the list of active devices used by the PM core.
+ */
+void device_pm_unlock(void)
+{
+ mutex_unlock(&dpm_list_mtx);
+}
+
+/**
+ * device_pm_add - Add a device to the PM core's list of active devices.
+ * @dev: Device to add to the list.
+ */
+void device_pm_add(struct device *dev)
+{
+ pr_debug("PM: Adding info for %s:%s\n",
+ dev->bus ? dev->bus->name : "No Bus",
+ kobject_name(&dev->kobj));
+ mutex_lock(&dpm_list_mtx);
+ if (dev->parent) {
+ if (dev->parent->power.status >= DPM_SUSPENDING)
+ dev_warn(dev, "parent %s should not be sleeping\n",
+ dev_name(dev->parent));
+ } else if (transition_started) {
+ /*
+ * We refuse to register parentless devices while a PM
+ * transition is in progress in order to avoid leaving them
+ * unhandled down the road
+ */
+ dev_WARN(dev, "Parentless device registered during a PM transaction\n");
+ }
+
+ list_add_tail(&dev->power.entry, &dpm_list);
+ mutex_unlock(&dpm_list_mtx);
+}
+
+/**
+ * device_pm_remove - Remove a device from the PM core's list of active devices.
+ * @dev: Device to be removed from the list.
+ */
+void device_pm_remove(struct device *dev)
+{
+ pr_debug("PM: Removing info for %s:%s\n",
+ dev->bus ? dev->bus->name : "No Bus",
+ kobject_name(&dev->kobj));
+ complete_all(&dev->power.completion);
+ mutex_lock(&dpm_list_mtx);
+ list_del_init(&dev->power.entry);
+ mutex_unlock(&dpm_list_mtx);
+ device_wakeup_disable(dev);
+ pm_runtime_remove(dev);
+}
+
+/**
+ * device_pm_move_before - Move device in the PM core's list of active devices.
+ * @deva: Device to move in dpm_list.
+ * @devb: Device @deva should come before.
+ */
+void device_pm_move_before(struct device *deva, struct device *devb)
+{
+ pr_debug("PM: Moving %s:%s before %s:%s\n",
+ deva->bus ? deva->bus->name : "No Bus",
+ kobject_name(&deva->kobj),
+ devb->bus ? devb->bus->name : "No Bus",
+ kobject_name(&devb->kobj));
+ /* Delete deva from dpm_list and reinsert before devb. */
+ list_move_tail(&deva->power.entry, &devb->power.entry);
+}
+
+/**
+ * device_pm_move_after - Move device in the PM core's list of active devices.
+ * @deva: Device to move in dpm_list.
+ * @devb: Device @deva should come after.
+ */
+void device_pm_move_after(struct device *deva, struct device *devb)
+{
+ pr_debug("PM: Moving %s:%s after %s:%s\n",
+ deva->bus ? deva->bus->name : "No Bus",
+ kobject_name(&deva->kobj),
+ devb->bus ? devb->bus->name : "No Bus",
+ kobject_name(&devb->kobj));
+ /* Delete deva from dpm_list and reinsert after devb. */
+ list_move(&deva->power.entry, &devb->power.entry);
+}
+
+/**
+ * device_pm_move_last - Move device to end of the PM core's list of devices.
+ * @dev: Device to move in dpm_list.
+ */
+void device_pm_move_last(struct device *dev)
+{
+ pr_debug("PM: Moving %s:%s to end of list\n",
+ dev->bus ? dev->bus->name : "No Bus",
+ kobject_name(&dev->kobj));
+ list_move_tail(&dev->power.entry, &dpm_list);
+}
+
+static ktime_t initcall_debug_start(struct device *dev)
+{
+ ktime_t calltime = ktime_set(0, 0);
+
+ if (initcall_debug) {
+ pr_info("calling %s+ @ %i\n",
+ dev_name(dev), task_pid_nr(current));
+ calltime = ktime_get();
+ }
+
+ return calltime;
+}
+
+static void initcall_debug_report(struct device *dev, ktime_t calltime,
+ int error)
+{
+ ktime_t delta, rettime;
+
+ if (initcall_debug) {
+ rettime = ktime_get();
+ delta = ktime_sub(rettime, calltime);
+ pr_info("call %s+ returned %d after %Ld usecs\n", dev_name(dev),
+ error, (unsigned long long)ktime_to_ns(delta) >> 10);
+ }
+}
+
+/**
+ * dpm_wait - Wait for a PM operation to complete.
+ * @dev: Device to wait for.
+ * @async: If unset, wait only if the device's power.async_suspend flag is set.
+ */
+static void dpm_wait(struct device *dev, bool async)
+{
+ if (!dev)
+ return;
+
+ if (async || (pm_async_enabled && dev->power.async_suspend))
+ wait_for_completion(&dev->power.completion);
+}
+
+static int dpm_wait_fn(struct device *dev, void *async_ptr)
+{
+ dpm_wait(dev, *((bool *)async_ptr));
+ return 0;
+}
+
+static void dpm_wait_for_children(struct device *dev, bool async)
+{
+ device_for_each_child(dev, &async, dpm_wait_fn);
+}
+
+/**
+ * pm_op - Execute the PM operation appropriate for given PM event.
+ * @dev: Device to handle.
+ * @ops: PM operations to choose from.
+ * @state: PM transition of the system being carried out.
+ */
+static int pm_op(struct device *dev,
+ const struct dev_pm_ops *ops,
+ pm_message_t state)
+{
+ int error = 0;
+ ktime_t calltime;
+
+ calltime = initcall_debug_start(dev);
+
+ switch (state.event) {
+#ifdef CONFIG_SUSPEND
+ case PM_EVENT_SUSPEND:
+ if (ops->suspend) {
+ error = ops->suspend(dev);
+ suspend_report_result(ops->suspend, error);
+ }
+ break;
+ case PM_EVENT_RESUME:
+ if (ops->resume) {
+ error = ops->resume(dev);
+ suspend_report_result(ops->resume, error);
+ }
+ break;
+#endif /* CONFIG_SUSPEND */
+#ifdef CONFIG_HIBERNATION
+ case PM_EVENT_FREEZE:
+ case PM_EVENT_QUIESCE:
+ if (ops->freeze) {
+ error = ops->freeze(dev);
+ suspend_report_result(ops->freeze, error);
+ }
+ break;
+ case PM_EVENT_HIBERNATE:
+ if (ops->poweroff) {
+ error = ops->poweroff(dev);
+ suspend_report_result(ops->poweroff, error);
+ }
+ break;
+ case PM_EVENT_THAW:
+ case PM_EVENT_RECOVER:
+ if (ops->thaw) {
+ error = ops->thaw(dev);
+ suspend_report_result(ops->thaw, error);
+ }
+ break;
+ case PM_EVENT_RESTORE:
+ if (ops->restore) {
+ error = ops->restore(dev);
+ suspend_report_result(ops->restore, error);
+ }
+ break;
+#endif /* CONFIG_HIBERNATION */
+ default:
+ error = -EINVAL;
+ }
+
+ initcall_debug_report(dev, calltime, error);
+
+ return error;
+}
+
+/**
+ * pm_noirq_op - Execute the PM operation appropriate for given PM event.
+ * @dev: Device to handle.
+ * @ops: PM operations to choose from.
+ * @state: PM transition of the system being carried out.
+ *
+ * The driver of @dev will not receive interrupts while this function is being
+ * executed.
+ */
+static int pm_noirq_op(struct device *dev,
+ const struct dev_pm_ops *ops,
+ pm_message_t state)
+{
+ int error = 0;
+ ktime_t calltime, delta, rettime;
+
+ if (initcall_debug) {
+ pr_info("calling %s+ @ %i, parent: %s\n",
+ dev_name(dev), task_pid_nr(current),
+ dev->parent ? dev_name(dev->parent) : "none");
+ calltime = ktime_get();
+ }
+
+ switch (state.event) {
+#ifdef CONFIG_SUSPEND
+ case PM_EVENT_SUSPEND:
+ if (ops->suspend_noirq) {
+ error = ops->suspend_noirq(dev);
+ suspend_report_result(ops->suspend_noirq, error);
+ }
+ break;
+ case PM_EVENT_RESUME:
+ if (ops->resume_noirq) {
+ error = ops->resume_noirq(dev);
+ suspend_report_result(ops->resume_noirq, error);
+ }
+ break;
+#endif /* CONFIG_SUSPEND */
+#ifdef CONFIG_HIBERNATION
+ case PM_EVENT_FREEZE:
+ case PM_EVENT_QUIESCE:
+ if (ops->freeze_noirq) {
+ error = ops->freeze_noirq(dev);
+ suspend_report_result(ops->freeze_noirq, error);
+ }
+ break;
+ case PM_EVENT_HIBERNATE:
+ if (ops->poweroff_noirq) {
+ error = ops->poweroff_noirq(dev);
+ suspend_report_result(ops->poweroff_noirq, error);
+ }
+ break;
+ case PM_EVENT_THAW:
+ case PM_EVENT_RECOVER:
+ if (ops->thaw_noirq) {
+ error = ops->thaw_noirq(dev);
+ suspend_report_result(ops->thaw_noirq, error);
+ }
+ break;
+ case PM_EVENT_RESTORE:
+ if (ops->restore_noirq) {
+ error = ops->restore_noirq(dev);
+ suspend_report_result(ops->restore_noirq, error);
+ }
+ break;
+#endif /* CONFIG_HIBERNATION */
+ default:
+ error = -EINVAL;
+ }
+
+ if (initcall_debug) {
+ rettime = ktime_get();
+ delta = ktime_sub(rettime, calltime);
+ printk("initcall %s_i+ returned %d after %Ld usecs\n",
+ dev_name(dev), error,
+ (unsigned long long)ktime_to_ns(delta) >> 10);
+ }
+
+ return error;
+}
+
+static char *pm_verb(int event)
+{
+ switch (event) {
+ case PM_EVENT_SUSPEND:
+ return "suspend";
+ case PM_EVENT_RESUME:
+ return "resume";
+ case PM_EVENT_FREEZE:
+ return "freeze";
+ case PM_EVENT_QUIESCE:
+ return "quiesce";
+ case PM_EVENT_HIBERNATE:
+ return "hibernate";
+ case PM_EVENT_THAW:
+ return "thaw";
+ case PM_EVENT_RESTORE:
+ return "restore";
+ case PM_EVENT_RECOVER:
+ return "recover";
+ default:
+ return "(unknown PM event)";
+ }
+}
+
+static void pm_dev_dbg(struct device *dev, pm_message_t state, char *info)
+{
+ dev_dbg(dev, "%s%s%s\n", info, pm_verb(state.event),
+ ((state.event & PM_EVENT_SLEEP) && device_may_wakeup(dev)) ?
+ ", may wakeup" : "");
+}
+
+static void pm_dev_err(struct device *dev, pm_message_t state, char *info,
+ int error)
+{
+ printk(KERN_ERR "PM: Device %s failed to %s%s: error %d\n",
+ kobject_name(&dev->kobj), pm_verb(state.event), info, error);
+}
+
+static void dpm_show_time(ktime_t starttime, pm_message_t state, char *info)
+{
+ ktime_t calltime;
+ s64 usecs64;
+ int usecs;
+
+ calltime = ktime_get();
+ usecs64 = ktime_to_ns(ktime_sub(calltime, starttime));
+ do_div(usecs64, NSEC_PER_USEC);
+ usecs = usecs64;
+ if (usecs == 0)
+ usecs = 1;
+ pr_info("PM: %s%s%s of devices complete after %ld.%03ld msecs\n",
+ info ?: "", info ? " " : "", pm_verb(state.event),
+ usecs / USEC_PER_MSEC, usecs % USEC_PER_MSEC);
+}
+
+/*------------------------- Resume routines -------------------------*/
+
+/**
+ * device_resume_noirq - Execute an "early resume" callback for given device.
+ * @dev: Device to handle.
+ * @state: PM transition of the system being carried out.
+ *
+ * The driver of @dev will not receive interrupts while this function is being
+ * executed.
+ */
+static int device_resume_noirq(struct device *dev, pm_message_t state)
+{
+ int error = 0;
+
+ TRACE_DEVICE(dev);
+ TRACE_RESUME(0);
+
+ if (dev->bus && dev->bus->pm) {
+ pm_dev_dbg(dev, state, "EARLY ");
+ error = pm_noirq_op(dev, dev->bus->pm, state);
+ if (error)
+ goto End;
+ }
+
+ if (dev->type && dev->type->pm) {
+ pm_dev_dbg(dev, state, "EARLY type ");
+ error = pm_noirq_op(dev, dev->type->pm, state);
+ if (error)
+ goto End;
+ }
+
+ if (dev->class && dev->class->pm) {
+ pm_dev_dbg(dev, state, "EARLY class ");
+ error = pm_noirq_op(dev, dev->class->pm, state);
+ }
+
+End:
+ TRACE_RESUME(error);
+ return error;
+}
+
+/**
+ * dpm_resume_noirq - Execute "early resume" callbacks for non-sysdev devices.
+ * @state: PM transition of the system being carried out.
+ *
+ * Call the "noirq" resume handlers for all devices marked as DPM_OFF_IRQ and
+ * enable device drivers to receive interrupts.
+ */
+void dpm_resume_noirq(pm_message_t state)
+{
+ struct device *dev;
+ ktime_t starttime = ktime_get();
+
+ mutex_lock(&dpm_list_mtx);
+ transition_started = false;
+ list_for_each_entry(dev, &dpm_list, power.entry)
+ if (dev->power.status > DPM_OFF) {
+ int error;
+
+ dev->power.status = DPM_OFF;
+ error = device_resume_noirq(dev, state);
+ if (error)
+ pm_dev_err(dev, state, " early", error);
+ }
+ mutex_unlock(&dpm_list_mtx);
+ dpm_show_time(starttime, state, "early");
+ resume_device_irqs();
+}
+EXPORT_SYMBOL_GPL(dpm_resume_noirq);
+
+/**
+ * legacy_resume - Execute a legacy (bus or class) resume callback for device.
+ * @dev: Device to resume.
+ * @cb: Resume callback to execute.
+ */
+static int legacy_resume(struct device *dev, int (*cb)(struct device *dev))
+{
+ int error;
+ ktime_t calltime;
+
+ calltime = initcall_debug_start(dev);
+
+ error = cb(dev);
+ suspend_report_result(cb, error);
+
+ initcall_debug_report(dev, calltime, error);
+
+ return error;
+}
+
+/**
+ * device_resume - Execute "resume" callbacks for given device.
+ * @dev: Device to handle.
+ * @state: PM transition of the system being carried out.
+ * @async: If true, the device is being resumed asynchronously.
+ */
+static int device_resume(struct device *dev, pm_message_t state, bool async)
+{
+ int error = 0;
+
+ TRACE_DEVICE(dev);
+ TRACE_RESUME(0);
+
+ dpm_wait(dev->parent, async);
+ device_lock(dev);
+
+ dev->power.status = DPM_RESUMING;
+
+ if (dev->bus) {
+ if (dev->bus->pm) {
+ pm_dev_dbg(dev, state, "");
+ error = pm_op(dev, dev->bus->pm, state);
+ } else if (dev->bus->resume) {
+ pm_dev_dbg(dev, state, "legacy ");
+ error = legacy_resume(dev, dev->bus->resume);
+ }
+ if (error)
+ goto End;
+ }
+
+ if (dev->type) {
+ if (dev->type->pm) {
+ pm_dev_dbg(dev, state, "type ");
+ error = pm_op(dev, dev->type->pm, state);
+ }
+ if (error)
+ goto End;
+ }
+
+ if (dev->class) {
+ if (dev->class->pm) {
+ pm_dev_dbg(dev, state, "class ");
+ error = pm_op(dev, dev->class->pm, state);
+ } else if (dev->class->resume) {
+ pm_dev_dbg(dev, state, "legacy class ");
+ error = legacy_resume(dev, dev->class->resume);
+ }
+ }
+ End:
+ device_unlock(dev);
+ complete_all(&dev->power.completion);
+
+ TRACE_RESUME(error);
+ return error;
+}
+
+static void async_resume(void *data, async_cookie_t cookie)
+{
+ struct device *dev = (struct device *)data;
+ int error;
+
+ error = device_resume(dev, pm_transition, true);
+ if (error)
+ pm_dev_err(dev, pm_transition, " async", error);
+ put_device(dev);
+}
+
+static bool is_async(struct device *dev)
+{
+ return dev->power.async_suspend && pm_async_enabled
+ && !pm_trace_is_enabled();
+}
+
+/**
+ * dpm_resume - Execute "resume" callbacks for non-sysdev devices.
+ * @state: PM transition of the system being carried out.
+ *
+ * Execute the appropriate "resume" callback for all devices whose status
+ * indicates that they are suspended.
+ */
+static void dpm_resume(pm_message_t state)
+{
+ struct list_head list;
+ struct device *dev;
+ ktime_t starttime = ktime_get();
+
+ INIT_LIST_HEAD(&list);
+ mutex_lock(&dpm_list_mtx);
+ pm_transition = state;
+
+ list_for_each_entry(dev, &dpm_list, power.entry) {
+ if (dev->power.status < DPM_OFF)
+ continue;
+
+ INIT_COMPLETION(dev->power.completion);
+ if (is_async(dev)) {
+ get_device(dev);
+ async_schedule(async_resume, dev);
+ }
+ }
+
+ while (!list_empty(&dpm_list)) {
+ dev = to_device(dpm_list.next);
+ get_device(dev);
+ if (dev->power.status >= DPM_OFF && !is_async(dev)) {
+ int error;
+
+ mutex_unlock(&dpm_list_mtx);
+
+ error = device_resume(dev, state, false);
+
+ mutex_lock(&dpm_list_mtx);
+ if (error)
+ pm_dev_err(dev, state, "", error);
+ } else if (dev->power.status == DPM_SUSPENDING) {
+ /* Allow new children of the device to be registered */
+ dev->power.status = DPM_RESUMING;
+ }
+ if (!list_empty(&dev->power.entry))
+ list_move_tail(&dev->power.entry, &list);
+ put_device(dev);
+ }
+ list_splice(&list, &dpm_list);
+ mutex_unlock(&dpm_list_mtx);
+ async_synchronize_full();
+ dpm_show_time(starttime, state, NULL);
+}
+
+/**
+ * device_complete - Complete a PM transition for given device.
+ * @dev: Device to handle.
+ * @state: PM transition of the system being carried out.
+ */
+static void device_complete(struct device *dev, pm_message_t state)
+{
+ device_lock(dev);
+
+ if (dev->class && dev->class->pm && dev->class->pm->complete) {
+ pm_dev_dbg(dev, state, "completing class ");
+ dev->class->pm->complete(dev);
+ }
+
+ if (dev->type && dev->type->pm && dev->type->pm->complete) {
+ pm_dev_dbg(dev, state, "completing type ");
+ dev->type->pm->complete(dev);
+ }
+
+ if (dev->bus && dev->bus->pm && dev->bus->pm->complete) {
+ pm_dev_dbg(dev, state, "completing ");
+ dev->bus->pm->complete(dev);
+ }
+
+ device_unlock(dev);
+}
+
+/**
+ * dpm_complete - Complete a PM transition for all non-sysdev devices.
+ * @state: PM transition of the system being carried out.
+ *
+ * Execute the ->complete() callbacks for all devices whose PM status is not
+ * DPM_ON (this allows new devices to be registered).
+ */
+static void dpm_complete(pm_message_t state)
+{
+ struct list_head list;
+
+ INIT_LIST_HEAD(&list);
+ mutex_lock(&dpm_list_mtx);
+ transition_started = false;
+ while (!list_empty(&dpm_list)) {
+ struct device *dev = to_device(dpm_list.prev);
+
+ get_device(dev);
+ if (dev->power.status > DPM_ON) {
+ dev->power.status = DPM_ON;
+ mutex_unlock(&dpm_list_mtx);
+
+ device_complete(dev, state);
+ pm_runtime_put_sync(dev);
+
+ mutex_lock(&dpm_list_mtx);
+ }
+ if (!list_empty(&dev->power.entry))
+ list_move(&dev->power.entry, &list);
+ put_device(dev);
+ }
+ list_splice(&list, &dpm_list);
+ mutex_unlock(&dpm_list_mtx);
+}
+
+/**
+ * dpm_resume_end - Execute "resume" callbacks and complete system transition.
+ * @state: PM transition of the system being carried out.
+ *
+ * Execute "resume" callbacks for all devices and complete the PM transition of
+ * the system.
+ */
+void dpm_resume_end(pm_message_t state)
+{
+ might_sleep();
+ dpm_resume(state);
+ dpm_complete(state);
+}
+EXPORT_SYMBOL_GPL(dpm_resume_end);
+
+
+/*------------------------- Suspend routines -------------------------*/
+
+/**
+ * resume_event - Return a "resume" message for given "suspend" sleep state.
+ * @sleep_state: PM message representing a sleep state.
+ *
+ * Return a PM message representing the resume event corresponding to given
+ * sleep state.
+ */
+static pm_message_t resume_event(pm_message_t sleep_state)
+{
+ switch (sleep_state.event) {
+ case PM_EVENT_SUSPEND:
+ return PMSG_RESUME;
+ case PM_EVENT_FREEZE:
+ case PM_EVENT_QUIESCE:
+ return PMSG_RECOVER;
+ case PM_EVENT_HIBERNATE:
+ return PMSG_RESTORE;
+ }
+ return PMSG_ON;
+}
+
+/**
+ * device_suspend_noirq - Execute a "late suspend" callback for given device.
+ * @dev: Device to handle.
+ * @state: PM transition of the system being carried out.
+ *
+ * The driver of @dev will not receive interrupts while this function is being
+ * executed.
+ */
+static int device_suspend_noirq(struct device *dev, pm_message_t state)
+{
+ int error = 0;
+
+ if (dev->class && dev->class->pm) {
+ pm_dev_dbg(dev, state, "LATE class ");
+ error = pm_noirq_op(dev, dev->class->pm, state);
+ if (error)
+ goto End;
+ }
+
+ if (dev->type && dev->type->pm) {
+ pm_dev_dbg(dev, state, "LATE type ");
+ error = pm_noirq_op(dev, dev->type->pm, state);
+ if (error)
+ goto End;
+ }
+
+ if (dev->bus && dev->bus->pm) {
+ pm_dev_dbg(dev, state, "LATE ");
+ error = pm_noirq_op(dev, dev->bus->pm, state);
+ }
+
+End:
+ return error;
+}
+
+/**
+ * dpm_suspend_noirq - Execute "late suspend" callbacks for non-sysdev devices.
+ * @state: PM transition of the system being carried out.
+ *
+ * Prevent device drivers from receiving interrupts and call the "noirq" suspend
+ * handlers for all non-sysdev devices.
+ */
+int dpm_suspend_noirq(pm_message_t state)
+{
+ struct device *dev;
+ ktime_t starttime = ktime_get();
+ int error = 0;
+
+ suspend_device_irqs();
+ mutex_lock(&dpm_list_mtx);
+ list_for_each_entry_reverse(dev, &dpm_list, power.entry) {
+ error = device_suspend_noirq(dev, state);
+ if (error) {
+ pm_dev_err(dev, state, " late", error);
+ break;
+ }
+ dev->power.status = DPM_OFF_IRQ;
+ }
+ mutex_unlock(&dpm_list_mtx);
+ if (error)
+ dpm_resume_noirq(resume_event(state));
+ else
+ dpm_show_time(starttime, state, "late");
+ return error;
+}
+EXPORT_SYMBOL_GPL(dpm_suspend_noirq);
+
+/**
+ * legacy_suspend - Execute a legacy (bus or class) suspend callback for device.
+ * @dev: Device to suspend.
+ * @state: PM transition of the system being carried out.
+ * @cb: Suspend callback to execute.
+ */
+static int legacy_suspend(struct device *dev, pm_message_t state,
+ int (*cb)(struct device *dev, pm_message_t state))
+{
+ int error;
+ ktime_t calltime;
+
+ calltime = initcall_debug_start(dev);
+
+ error = cb(dev, state);
+ suspend_report_result(cb, error);
+
+ initcall_debug_report(dev, calltime, error);
+
+ return error;
+}
+
+static int async_error;
+
+/**
+ * device_suspend - Execute "suspend" callbacks for given device.
+ * @dev: Device to handle.
+ * @state: PM transition of the system being carried out.
+ * @async: If true, the device is being suspended asynchronously.
+ */
+static int __device_suspend(struct device *dev, pm_message_t state, bool async)
+{
+ int error = 0;
+
+ dpm_wait_for_children(dev, async);
+ device_lock(dev);
+
+ if (async_error)
+ goto End;
+
+ if (dev->class) {
+ if (dev->class->pm) {
+ pm_dev_dbg(dev, state, "class ");
+ error = pm_op(dev, dev->class->pm, state);
+ } else if (dev->class->suspend) {
+ pm_dev_dbg(dev, state, "legacy class ");
+ error = legacy_suspend(dev, state, dev->class->suspend);
+ }
+ if (error)
+ goto End;
+ }
+
+ if (dev->type) {
+ if (dev->type->pm) {
+ pm_dev_dbg(dev, state, "type ");
+ error = pm_op(dev, dev->type->pm, state);
+ }
+ if (error)
+ goto End;
+ }
+
+ if (dev->bus) {
+ if (dev->bus->pm) {
+ pm_dev_dbg(dev, state, "");
+ error = pm_op(dev, dev->bus->pm, state);
+ } else if (dev->bus->suspend) {
+ pm_dev_dbg(dev, state, "legacy ");
+ error = legacy_suspend(dev, state, dev->bus->suspend);
+ }
+ }
+
+ if (!error)
+ dev->power.status = DPM_OFF;
+
+ End:
+ device_unlock(dev);
+ complete_all(&dev->power.completion);
+
+ return error;
+}
+
+static void async_suspend(void *data, async_cookie_t cookie)
+{
+ struct device *dev = (struct device *)data;
+ int error;
+
+ error = __device_suspend(dev, pm_transition, true);
+ if (error) {
+ pm_dev_err(dev, pm_transition, " async", error);
+ async_error = error;
+ }
+
+ put_device(dev);
+}
+
+static int device_suspend(struct device *dev)
+{
+ INIT_COMPLETION(dev->power.completion);
+
+ if (pm_async_enabled && dev->power.async_suspend) {
+ get_device(dev);
+ async_schedule(async_suspend, dev);
+ return 0;
+ }
+
+ return __device_suspend(dev, pm_transition, false);
+}
+
+/**
+ * dpm_suspend - Execute "suspend" callbacks for all non-sysdev devices.
+ * @state: PM transition of the system being carried out.
+ */
+static int dpm_suspend(pm_message_t state)
+{
+ struct list_head list;
+ ktime_t starttime = ktime_get();
+ int error = 0;
+
+ INIT_LIST_HEAD(&list);
+ mutex_lock(&dpm_list_mtx);
+ pm_transition = state;
+ async_error = 0;
+ while (!list_empty(&dpm_list)) {
+ struct device *dev = to_device(dpm_list.prev);
+
+ get_device(dev);
+ mutex_unlock(&dpm_list_mtx);
+
+ error = device_suspend(dev);
+
+ mutex_lock(&dpm_list_mtx);
+ if (error) {
+ pm_dev_err(dev, state, "", error);
+ put_device(dev);
+ break;
+ }
+ if (!list_empty(&dev->power.entry))
+ list_move(&dev->power.entry, &list);
+ put_device(dev);
+ if (async_error)
+ break;
+ }
+ list_splice(&list, dpm_list.prev);
+ mutex_unlock(&dpm_list_mtx);
+ async_synchronize_full();
+ if (!error)
+ error = async_error;
+ if (!error)
+ dpm_show_time(starttime, state, NULL);
+ return error;
+}
+
+/**
+ * device_prepare - Prepare a device for system power transition.
+ * @dev: Device to handle.
+ * @state: PM transition of the system being carried out.
+ *
+ * Execute the ->prepare() callback(s) for given device. No new children of the
+ * device may be registered after this function has returned.
+ */
+static int device_prepare(struct device *dev, pm_message_t state)
+{
+ int error = 0;
+
+ device_lock(dev);
+
+ if (dev->bus && dev->bus->pm && dev->bus->pm->prepare) {
+ pm_dev_dbg(dev, state, "preparing ");
+ error = dev->bus->pm->prepare(dev);
+ suspend_report_result(dev->bus->pm->prepare, error);
+ if (error)
+ goto End;
+ }
+
+ if (dev->type && dev->type->pm && dev->type->pm->prepare) {
+ pm_dev_dbg(dev, state, "preparing type ");
+ error = dev->type->pm->prepare(dev);
+ suspend_report_result(dev->type->pm->prepare, error);
+ if (error)
+ goto End;
+ }
+
+ if (dev->class && dev->class->pm && dev->class->pm->prepare) {
+ pm_dev_dbg(dev, state, "preparing class ");
+ error = dev->class->pm->prepare(dev);
+ suspend_report_result(dev->class->pm->prepare, error);
+ }
+ End:
+ device_unlock(dev);
+
+ return error;
+}
+
+/**
+ * dpm_prepare - Prepare all non-sysdev devices for a system PM transition.
+ * @state: PM transition of the system being carried out.
+ *
+ * Execute the ->prepare() callback(s) for all devices.
+ */
+static int dpm_prepare(pm_message_t state)
+{
+ struct list_head list;
+ int error = 0;
+
+ INIT_LIST_HEAD(&list);
+ mutex_lock(&dpm_list_mtx);
+ transition_started = true;
+ while (!list_empty(&dpm_list)) {
+ struct device *dev = to_device(dpm_list.next);
+
+ get_device(dev);
+ dev->power.status = DPM_PREPARING;
+ mutex_unlock(&dpm_list_mtx);
+
+ pm_runtime_get_noresume(dev);
+ if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) {
+ /* Wake-up requested during system sleep transition. */
+ pm_runtime_put_sync(dev);
+ error = -EBUSY;
+ } else {
+ error = device_prepare(dev, state);
+ }
+
+ mutex_lock(&dpm_list_mtx);
+ if (error) {
+ dev->power.status = DPM_ON;
+ if (error == -EAGAIN) {
+ put_device(dev);
+ error = 0;
+ continue;
+ }
+ printk(KERN_ERR "PM: Failed to prepare device %s "
+ "for power transition: error %d\n",
+ kobject_name(&dev->kobj), error);
+ put_device(dev);
+ break;
+ }
+ dev->power.status = DPM_SUSPENDING;
+ if (!list_empty(&dev->power.entry))
+ list_move_tail(&dev->power.entry, &list);
+ put_device(dev);
+ }
+ list_splice(&list, &dpm_list);
+ mutex_unlock(&dpm_list_mtx);
+ return error;
+}
+
+/**
+ * dpm_suspend_start - Prepare devices for PM transition and suspend them.
+ * @state: PM transition of the system being carried out.
+ *
+ * Prepare all non-sysdev devices for system PM transition and execute "suspend"
+ * callbacks for them.
+ */
+int dpm_suspend_start(pm_message_t state)
+{
+ int error;
+
+ might_sleep();
+ error = dpm_prepare(state);
+ if (!error)
+ error = dpm_suspend(state);
+ return error;
+}
+EXPORT_SYMBOL_GPL(dpm_suspend_start);
+
+void __suspend_report_result(const char *function, void *fn, int ret)
+{
+ if (ret)
+ printk(KERN_ERR "%s(): %pF returns %d\n", function, fn, ret);
+}
+EXPORT_SYMBOL_GPL(__suspend_report_result);
+
+/**
+ * device_pm_wait_for_dev - Wait for suspend/resume of a device to complete.
+ * @dev: Device to wait for.
+ * @subordinate: Device that needs to wait for @dev.
+ */
+void device_pm_wait_for_dev(struct device *subordinate, struct device *dev)
+{
+ dpm_wait(dev, subordinate->power.async_suspend);
+}
+EXPORT_SYMBOL_GPL(device_pm_wait_for_dev);
Index: linux-2.6/drivers/base/power/power.h
===================================================================
--- linux-2.6.orig/drivers/base/power/power.h
+++ linux-2.6/drivers/base/power/power.h
@@ -15,7 +15,7 @@ static inline void pm_runtime_remove(str
/* kernel/power/main.c */
extern int pm_async_enabled;
-/* drivers/base/power/main.c */
+/* drivers/base/power/sleep.c */
extern struct list_head dpm_list; /* The active device list */
static inline struct device *to_device(struct list_head *entry)
--
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