forked from Minki/linux
PM: merge device power-management source files
This patch (as993) merges the suspend.c and resume.c files in drivers/base/power into main.c, making some public symbols private. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Acked-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern
Greg Kroah-Hartman
parent
6d66f5cd26
commit
cd59abfcc4
@ -1,5 +1,5 @@
|
||||
obj-y := shutdown.o
|
||||
obj-$(CONFIG_PM_SLEEP) += main.o suspend.o resume.o sysfs.o
|
||||
obj-$(CONFIG_PM_SLEEP) += main.o sysfs.o
|
||||
obj-$(CONFIG_PM_TRACE) += trace.o
|
||||
|
||||
ifeq ($(CONFIG_DEBUG_DRIVER),y)
|
||||
|
||||
@ -20,19 +20,24 @@
|
||||
*/
|
||||
|
||||
#include <linux/device.h>
|
||||
#include <linux/kallsyms.h>
|
||||
#include <linux/mutex.h>
|
||||
#include <linux/pm.h>
|
||||
#include <linux/resume-trace.h>
|
||||
|
||||
#include "../base.h"
|
||||
#include "power.h"
|
||||
|
||||
LIST_HEAD(dpm_active);
|
||||
LIST_HEAD(dpm_off);
|
||||
LIST_HEAD(dpm_off_irq);
|
||||
static LIST_HEAD(dpm_off);
|
||||
static LIST_HEAD(dpm_off_irq);
|
||||
|
||||
DEFINE_MUTEX(dpm_mtx);
|
||||
DEFINE_MUTEX(dpm_list_mtx);
|
||||
static DEFINE_MUTEX(dpm_mtx);
|
||||
static DEFINE_MUTEX(dpm_list_mtx);
|
||||
|
||||
int (*platform_enable_wakeup)(struct device *dev, int is_on);
|
||||
|
||||
|
||||
int device_pm_add(struct device *dev)
|
||||
{
|
||||
int error;
|
||||
@ -61,3 +66,334 @@ void device_pm_remove(struct device *dev)
|
||||
}
|
||||
|
||||
|
||||
/*------------------------- Resume routines -------------------------*/
|
||||
|
||||
/**
|
||||
* resume_device - Restore state for one device.
|
||||
* @dev: Device.
|
||||
*
|
||||
*/
|
||||
|
||||
static int resume_device(struct device * dev)
|
||||
{
|
||||
int error = 0;
|
||||
|
||||
TRACE_DEVICE(dev);
|
||||
TRACE_RESUME(0);
|
||||
|
||||
down(&dev->sem);
|
||||
|
||||
if (dev->bus && dev->bus->resume) {
|
||||
dev_dbg(dev,"resuming\n");
|
||||
error = dev->bus->resume(dev);
|
||||
}
|
||||
|
||||
if (!error && dev->type && dev->type->resume) {
|
||||
dev_dbg(dev,"resuming\n");
|
||||
error = dev->type->resume(dev);
|
||||
}
|
||||
|
||||
if (!error && dev->class && dev->class->resume) {
|
||||
dev_dbg(dev,"class resume\n");
|
||||
error = dev->class->resume(dev);
|
||||
}
|
||||
|
||||
up(&dev->sem);
|
||||
|
||||
TRACE_RESUME(error);
|
||||
return error;
|
||||
}
|
||||
|
||||
|
||||
static int resume_device_early(struct device * dev)
|
||||
{
|
||||
int error = 0;
|
||||
|
||||
TRACE_DEVICE(dev);
|
||||
TRACE_RESUME(0);
|
||||
if (dev->bus && dev->bus->resume_early) {
|
||||
dev_dbg(dev,"EARLY resume\n");
|
||||
error = dev->bus->resume_early(dev);
|
||||
}
|
||||
TRACE_RESUME(error);
|
||||
return error;
|
||||
}
|
||||
|
||||
/*
|
||||
* Resume the devices that have either not gone through
|
||||
* the late suspend, or that did go through it but also
|
||||
* went through the early resume
|
||||
*/
|
||||
static void dpm_resume(void)
|
||||
{
|
||||
mutex_lock(&dpm_list_mtx);
|
||||
while(!list_empty(&dpm_off)) {
|
||||
struct list_head * entry = dpm_off.next;
|
||||
struct device * dev = to_device(entry);
|
||||
|
||||
get_device(dev);
|
||||
list_move_tail(entry, &dpm_active);
|
||||
|
||||
mutex_unlock(&dpm_list_mtx);
|
||||
resume_device(dev);
|
||||
mutex_lock(&dpm_list_mtx);
|
||||
put_device(dev);
|
||||
}
|
||||
mutex_unlock(&dpm_list_mtx);
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* device_resume - Restore state of each device in system.
|
||||
*
|
||||
* Walk the dpm_off list, remove each entry, resume the device,
|
||||
* then add it to the dpm_active list.
|
||||
*/
|
||||
|
||||
void device_resume(void)
|
||||
{
|
||||
might_sleep();
|
||||
mutex_lock(&dpm_mtx);
|
||||
dpm_resume();
|
||||
mutex_unlock(&dpm_mtx);
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL_GPL(device_resume);
|
||||
|
||||
|
||||
/**
|
||||
* dpm_power_up - Power on some devices.
|
||||
*
|
||||
* Walk the dpm_off_irq list and power each device up. This
|
||||
* is used for devices that required they be powered down with
|
||||
* interrupts disabled. As devices are powered on, they are moved
|
||||
* to the dpm_active list.
|
||||
*
|
||||
* Interrupts must be disabled when calling this.
|
||||
*/
|
||||
|
||||
static void dpm_power_up(void)
|
||||
{
|
||||
while(!list_empty(&dpm_off_irq)) {
|
||||
struct list_head * entry = dpm_off_irq.next;
|
||||
struct device * dev = to_device(entry);
|
||||
|
||||
list_move_tail(entry, &dpm_off);
|
||||
resume_device_early(dev);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* device_power_up - Turn on all devices that need special attention.
|
||||
*
|
||||
* Power on system devices then devices that required we shut them down
|
||||
* with interrupts disabled.
|
||||
* Called with interrupts disabled.
|
||||
*/
|
||||
|
||||
void device_power_up(void)
|
||||
{
|
||||
sysdev_resume();
|
||||
dpm_power_up();
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL_GPL(device_power_up);
|
||||
|
||||
|
||||
/*------------------------- Suspend routines -------------------------*/
|
||||
|
||||
/*
|
||||
* The entries in the dpm_active 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.
|
||||
*
|
||||
* All list on the suspend path are done in reverse order, so we operate
|
||||
* on the leaves of the device tree (or forests, depending on how you want
|
||||
* to look at it ;) first. As nodes are removed from the back of the list,
|
||||
* they are inserted into the front of their destintation lists.
|
||||
*
|
||||
* Things are the reverse on the resume path - iterations are done in
|
||||
* forward order, and nodes are inserted at the back of their destination
|
||||
* lists. This way, the ancestors will be accessed before their descendents.
|
||||
*/
|
||||
|
||||
static inline char *suspend_verb(u32 event)
|
||||
{
|
||||
switch (event) {
|
||||
case PM_EVENT_SUSPEND: return "suspend";
|
||||
case PM_EVENT_FREEZE: return "freeze";
|
||||
case PM_EVENT_PRETHAW: return "prethaw";
|
||||
default: return "(unknown suspend event)";
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
static void
|
||||
suspend_device_dbg(struct device *dev, pm_message_t state, char *info)
|
||||
{
|
||||
dev_dbg(dev, "%s%s%s\n", info, suspend_verb(state.event),
|
||||
((state.event == PM_EVENT_SUSPEND) && device_may_wakeup(dev)) ?
|
||||
", may wakeup" : "");
|
||||
}
|
||||
|
||||
/**
|
||||
* suspend_device - Save state of one device.
|
||||
* @dev: Device.
|
||||
* @state: Power state device is entering.
|
||||
*/
|
||||
|
||||
static int suspend_device(struct device * dev, pm_message_t state)
|
||||
{
|
||||
int error = 0;
|
||||
|
||||
down(&dev->sem);
|
||||
if (dev->power.power_state.event) {
|
||||
dev_dbg(dev, "PM: suspend %d-->%d\n",
|
||||
dev->power.power_state.event, state.event);
|
||||
}
|
||||
|
||||
if (dev->class && dev->class->suspend) {
|
||||
suspend_device_dbg(dev, state, "class ");
|
||||
error = dev->class->suspend(dev, state);
|
||||
suspend_report_result(dev->class->suspend, error);
|
||||
}
|
||||
|
||||
if (!error && dev->type && dev->type->suspend) {
|
||||
suspend_device_dbg(dev, state, "type ");
|
||||
error = dev->type->suspend(dev, state);
|
||||
suspend_report_result(dev->type->suspend, error);
|
||||
}
|
||||
|
||||
if (!error && dev->bus && dev->bus->suspend) {
|
||||
suspend_device_dbg(dev, state, "");
|
||||
error = dev->bus->suspend(dev, state);
|
||||
suspend_report_result(dev->bus->suspend, error);
|
||||
}
|
||||
up(&dev->sem);
|
||||
return error;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* This is called with interrupts off, only a single CPU
|
||||
* running. We can't acquire a mutex or semaphore (and we don't
|
||||
* need the protection)
|
||||
*/
|
||||
static int suspend_device_late(struct device *dev, pm_message_t state)
|
||||
{
|
||||
int error = 0;
|
||||
|
||||
if (dev->bus && dev->bus->suspend_late) {
|
||||
suspend_device_dbg(dev, state, "LATE ");
|
||||
error = dev->bus->suspend_late(dev, state);
|
||||
suspend_report_result(dev->bus->suspend_late, error);
|
||||
}
|
||||
return error;
|
||||
}
|
||||
|
||||
/**
|
||||
* device_suspend - Save state and stop all devices in system.
|
||||
* @state: Power state to put each device in.
|
||||
*
|
||||
* Walk the dpm_active list, call ->suspend() for each device, and move
|
||||
* it to the dpm_off list.
|
||||
*
|
||||
* (For historical reasons, if it returns -EAGAIN, that used to mean
|
||||
* that the device would be called again with interrupts disabled.
|
||||
* These days, we use the "suspend_late()" callback for that, so we
|
||||
* print a warning and consider it an error).
|
||||
*
|
||||
* If we get a different error, try and back out.
|
||||
*
|
||||
* If we hit a failure with any of the devices, call device_resume()
|
||||
* above to bring the suspended devices back to life.
|
||||
*
|
||||
*/
|
||||
|
||||
int device_suspend(pm_message_t state)
|
||||
{
|
||||
int error = 0;
|
||||
|
||||
might_sleep();
|
||||
mutex_lock(&dpm_mtx);
|
||||
mutex_lock(&dpm_list_mtx);
|
||||
while (!list_empty(&dpm_active) && error == 0) {
|
||||
struct list_head * entry = dpm_active.prev;
|
||||
struct device * dev = to_device(entry);
|
||||
|
||||
get_device(dev);
|
||||
mutex_unlock(&dpm_list_mtx);
|
||||
|
||||
error = suspend_device(dev, state);
|
||||
|
||||
mutex_lock(&dpm_list_mtx);
|
||||
|
||||
/* Check if the device got removed */
|
||||
if (!list_empty(&dev->power.entry)) {
|
||||
/* Move it to the dpm_off list */
|
||||
if (!error)
|
||||
list_move(&dev->power.entry, &dpm_off);
|
||||
}
|
||||
if (error)
|
||||
printk(KERN_ERR "Could not suspend device %s: "
|
||||
"error %d%s\n",
|
||||
kobject_name(&dev->kobj), error,
|
||||
error == -EAGAIN ? " (please convert to suspend_late)" : "");
|
||||
put_device(dev);
|
||||
}
|
||||
mutex_unlock(&dpm_list_mtx);
|
||||
if (error)
|
||||
dpm_resume();
|
||||
|
||||
mutex_unlock(&dpm_mtx);
|
||||
return error;
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL_GPL(device_suspend);
|
||||
|
||||
/**
|
||||
* device_power_down - Shut down special devices.
|
||||
* @state: Power state to enter.
|
||||
*
|
||||
* Walk the dpm_off_irq list, calling ->power_down() for each device that
|
||||
* couldn't power down the device with interrupts enabled. When we're
|
||||
* done, power down system devices.
|
||||
*/
|
||||
|
||||
int device_power_down(pm_message_t state)
|
||||
{
|
||||
int error = 0;
|
||||
struct device * dev;
|
||||
|
||||
while (!list_empty(&dpm_off)) {
|
||||
struct list_head * entry = dpm_off.prev;
|
||||
|
||||
dev = to_device(entry);
|
||||
error = suspend_device_late(dev, state);
|
||||
if (error)
|
||||
goto Error;
|
||||
list_move(&dev->power.entry, &dpm_off_irq);
|
||||
}
|
||||
|
||||
error = sysdev_suspend(state);
|
||||
Done:
|
||||
return error;
|
||||
Error:
|
||||
printk(KERN_ERR "Could not power down device %s: "
|
||||
"error %d\n", kobject_name(&dev->kobj), error);
|
||||
dpm_power_up();
|
||||
goto Done;
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL_GPL(device_power_down);
|
||||
|
||||
void __suspend_report_result(const char *function, void *fn, int ret)
|
||||
{
|
||||
if (ret) {
|
||||
printk(KERN_ERR "%s(): ", function);
|
||||
print_fn_descriptor_symbol("%s() returns ", (unsigned long)fn);
|
||||
printk("%d\n", ret);
|
||||
}
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(__suspend_report_result);
|
||||
|
||||
@ -11,32 +11,11 @@ extern void device_shutdown(void);
|
||||
* main.c
|
||||
*/
|
||||
|
||||
/*
|
||||
* Used to synchronize global power management operations.
|
||||
*/
|
||||
extern struct mutex dpm_mtx;
|
||||
|
||||
/*
|
||||
* Used to serialize changes to the dpm_* lists.
|
||||
*/
|
||||
extern struct mutex dpm_list_mtx;
|
||||
|
||||
/*
|
||||
* The PM lists.
|
||||
*/
|
||||
extern struct list_head dpm_active;
|
||||
extern struct list_head dpm_off;
|
||||
extern struct list_head dpm_off_irq;
|
||||
|
||||
|
||||
static inline struct dev_pm_info * to_pm_info(struct list_head * entry)
|
||||
{
|
||||
return container_of(entry, struct dev_pm_info, entry);
|
||||
}
|
||||
extern struct list_head dpm_active; /* The active device list */
|
||||
|
||||
static inline struct device * to_device(struct list_head * entry)
|
||||
{
|
||||
return container_of(to_pm_info(entry), struct device, power);
|
||||
return container_of(entry, struct device, power.entry);
|
||||
}
|
||||
|
||||
extern int device_pm_add(struct device *);
|
||||
@ -49,13 +28,6 @@ extern void device_pm_remove(struct device *);
|
||||
extern int dpm_sysfs_add(struct device *);
|
||||
extern void dpm_sysfs_remove(struct device *);
|
||||
|
||||
/*
|
||||
* resume.c
|
||||
*/
|
||||
|
||||
extern void dpm_resume(void);
|
||||
extern void dpm_power_up(void);
|
||||
|
||||
#else /* CONFIG_PM_SLEEP */
|
||||
|
||||
|
||||
|
||||
@ -1,149 +0,0 @@
|
||||
/*
|
||||
* resume.c - Functions for waking devices up.
|
||||
*
|
||||
* Copyright (c) 2003 Patrick Mochel
|
||||
* Copyright (c) 2003 Open Source Development Labs
|
||||
*
|
||||
* This file is released under the GPLv2
|
||||
*
|
||||
*/
|
||||
|
||||
#include <linux/device.h>
|
||||
#include <linux/resume-trace.h>
|
||||
#include "../base.h"
|
||||
#include "power.h"
|
||||
|
||||
|
||||
/**
|
||||
* resume_device - Restore state for one device.
|
||||
* @dev: Device.
|
||||
*
|
||||
*/
|
||||
|
||||
static int resume_device(struct device * dev)
|
||||
{
|
||||
int error = 0;
|
||||
|
||||
TRACE_DEVICE(dev);
|
||||
TRACE_RESUME(0);
|
||||
|
||||
down(&dev->sem);
|
||||
|
||||
if (dev->bus && dev->bus->resume) {
|
||||
dev_dbg(dev,"resuming\n");
|
||||
error = dev->bus->resume(dev);
|
||||
}
|
||||
|
||||
if (!error && dev->type && dev->type->resume) {
|
||||
dev_dbg(dev,"resuming\n");
|
||||
error = dev->type->resume(dev);
|
||||
}
|
||||
|
||||
if (!error && dev->class && dev->class->resume) {
|
||||
dev_dbg(dev,"class resume\n");
|
||||
error = dev->class->resume(dev);
|
||||
}
|
||||
|
||||
up(&dev->sem);
|
||||
|
||||
TRACE_RESUME(error);
|
||||
return error;
|
||||
}
|
||||
|
||||
|
||||
static int resume_device_early(struct device * dev)
|
||||
{
|
||||
int error = 0;
|
||||
|
||||
TRACE_DEVICE(dev);
|
||||
TRACE_RESUME(0);
|
||||
if (dev->bus && dev->bus->resume_early) {
|
||||
dev_dbg(dev,"EARLY resume\n");
|
||||
error = dev->bus->resume_early(dev);
|
||||
}
|
||||
TRACE_RESUME(error);
|
||||
return error;
|
||||
}
|
||||
|
||||
/*
|
||||
* Resume the devices that have either not gone through
|
||||
* the late suspend, or that did go through it but also
|
||||
* went through the early resume
|
||||
*/
|
||||
void dpm_resume(void)
|
||||
{
|
||||
mutex_lock(&dpm_list_mtx);
|
||||
while(!list_empty(&dpm_off)) {
|
||||
struct list_head * entry = dpm_off.next;
|
||||
struct device * dev = to_device(entry);
|
||||
|
||||
get_device(dev);
|
||||
list_move_tail(entry, &dpm_active);
|
||||
|
||||
mutex_unlock(&dpm_list_mtx);
|
||||
resume_device(dev);
|
||||
mutex_lock(&dpm_list_mtx);
|
||||
put_device(dev);
|
||||
}
|
||||
mutex_unlock(&dpm_list_mtx);
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* device_resume - Restore state of each device in system.
|
||||
*
|
||||
* Walk the dpm_off list, remove each entry, resume the device,
|
||||
* then add it to the dpm_active list.
|
||||
*/
|
||||
|
||||
void device_resume(void)
|
||||
{
|
||||
might_sleep();
|
||||
mutex_lock(&dpm_mtx);
|
||||
dpm_resume();
|
||||
mutex_unlock(&dpm_mtx);
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL_GPL(device_resume);
|
||||
|
||||
|
||||
/**
|
||||
* dpm_power_up - Power on some devices.
|
||||
*
|
||||
* Walk the dpm_off_irq list and power each device up. This
|
||||
* is used for devices that required they be powered down with
|
||||
* interrupts disabled. As devices are powered on, they are moved
|
||||
* to the dpm_active list.
|
||||
*
|
||||
* Interrupts must be disabled when calling this.
|
||||
*/
|
||||
|
||||
void dpm_power_up(void)
|
||||
{
|
||||
while(!list_empty(&dpm_off_irq)) {
|
||||
struct list_head * entry = dpm_off_irq.next;
|
||||
struct device * dev = to_device(entry);
|
||||
|
||||
list_move_tail(entry, &dpm_off);
|
||||
resume_device_early(dev);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* device_power_up - Turn on all devices that need special attention.
|
||||
*
|
||||
* Power on system devices then devices that required we shut them down
|
||||
* with interrupts disabled.
|
||||
* Called with interrupts disabled.
|
||||
*/
|
||||
|
||||
void device_power_up(void)
|
||||
{
|
||||
sysdev_resume();
|
||||
dpm_power_up();
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL_GPL(device_power_up);
|
||||
|
||||
|
||||
@ -1,210 +0,0 @@
|
||||
/*
|
||||
* suspend.c - Functions for putting devices to sleep.
|
||||
*
|
||||
* Copyright (c) 2003 Patrick Mochel
|
||||
* Copyright (c) 2003 Open Source Development Labs
|
||||
*
|
||||
* This file is released under the GPLv2
|
||||
*
|
||||
*/
|
||||
|
||||
#include <linux/device.h>
|
||||
#include <linux/kallsyms.h>
|
||||
#include <linux/pm.h>
|
||||
#include "../base.h"
|
||||
#include "power.h"
|
||||
|
||||
/*
|
||||
* The entries in the dpm_active 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.
|
||||
*
|
||||
* All list on the suspend path are done in reverse order, so we operate
|
||||
* on the leaves of the device tree (or forests, depending on how you want
|
||||
* to look at it ;) first. As nodes are removed from the back of the list,
|
||||
* they are inserted into the front of their destintation lists.
|
||||
*
|
||||
* Things are the reverse on the resume path - iterations are done in
|
||||
* forward order, and nodes are inserted at the back of their destination
|
||||
* lists. This way, the ancestors will be accessed before their descendents.
|
||||
*/
|
||||
|
||||
static inline char *suspend_verb(u32 event)
|
||||
{
|
||||
switch (event) {
|
||||
case PM_EVENT_SUSPEND: return "suspend";
|
||||
case PM_EVENT_FREEZE: return "freeze";
|
||||
case PM_EVENT_PRETHAW: return "prethaw";
|
||||
default: return "(unknown suspend event)";
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
static void
|
||||
suspend_device_dbg(struct device *dev, pm_message_t state, char *info)
|
||||
{
|
||||
dev_dbg(dev, "%s%s%s\n", info, suspend_verb(state.event),
|
||||
((state.event == PM_EVENT_SUSPEND) && device_may_wakeup(dev)) ?
|
||||
", may wakeup" : "");
|
||||
}
|
||||
|
||||
/**
|
||||
* suspend_device - Save state of one device.
|
||||
* @dev: Device.
|
||||
* @state: Power state device is entering.
|
||||
*/
|
||||
|
||||
static int suspend_device(struct device * dev, pm_message_t state)
|
||||
{
|
||||
int error = 0;
|
||||
|
||||
down(&dev->sem);
|
||||
if (dev->power.power_state.event) {
|
||||
dev_dbg(dev, "PM: suspend %d-->%d\n",
|
||||
dev->power.power_state.event, state.event);
|
||||
}
|
||||
|
||||
if (dev->class && dev->class->suspend) {
|
||||
suspend_device_dbg(dev, state, "class ");
|
||||
error = dev->class->suspend(dev, state);
|
||||
suspend_report_result(dev->class->suspend, error);
|
||||
}
|
||||
|
||||
if (!error && dev->type && dev->type->suspend) {
|
||||
suspend_device_dbg(dev, state, "type ");
|
||||
error = dev->type->suspend(dev, state);
|
||||
suspend_report_result(dev->type->suspend, error);
|
||||
}
|
||||
|
||||
if (!error && dev->bus && dev->bus->suspend) {
|
||||
suspend_device_dbg(dev, state, "");
|
||||
error = dev->bus->suspend(dev, state);
|
||||
suspend_report_result(dev->bus->suspend, error);
|
||||
}
|
||||
up(&dev->sem);
|
||||
return error;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* This is called with interrupts off, only a single CPU
|
||||
* running. We can't acquire a mutex or semaphore (and we don't
|
||||
* need the protection)
|
||||
*/
|
||||
static int suspend_device_late(struct device *dev, pm_message_t state)
|
||||
{
|
||||
int error = 0;
|
||||
|
||||
if (dev->bus && dev->bus->suspend_late) {
|
||||
suspend_device_dbg(dev, state, "LATE ");
|
||||
error = dev->bus->suspend_late(dev, state);
|
||||
suspend_report_result(dev->bus->suspend_late, error);
|
||||
}
|
||||
return error;
|
||||
}
|
||||
|
||||
/**
|
||||
* device_suspend - Save state and stop all devices in system.
|
||||
* @state: Power state to put each device in.
|
||||
*
|
||||
* Walk the dpm_active list, call ->suspend() for each device, and move
|
||||
* it to the dpm_off list.
|
||||
*
|
||||
* (For historical reasons, if it returns -EAGAIN, that used to mean
|
||||
* that the device would be called again with interrupts disabled.
|
||||
* These days, we use the "suspend_late()" callback for that, so we
|
||||
* print a warning and consider it an error).
|
||||
*
|
||||
* If we get a different error, try and back out.
|
||||
*
|
||||
* If we hit a failure with any of the devices, call device_resume()
|
||||
* above to bring the suspended devices back to life.
|
||||
*
|
||||
*/
|
||||
|
||||
int device_suspend(pm_message_t state)
|
||||
{
|
||||
int error = 0;
|
||||
|
||||
might_sleep();
|
||||
mutex_lock(&dpm_mtx);
|
||||
mutex_lock(&dpm_list_mtx);
|
||||
while (!list_empty(&dpm_active) && error == 0) {
|
||||
struct list_head * entry = dpm_active.prev;
|
||||
struct device * dev = to_device(entry);
|
||||
|
||||
get_device(dev);
|
||||
mutex_unlock(&dpm_list_mtx);
|
||||
|
||||
error = suspend_device(dev, state);
|
||||
|
||||
mutex_lock(&dpm_list_mtx);
|
||||
|
||||
/* Check if the device got removed */
|
||||
if (!list_empty(&dev->power.entry)) {
|
||||
/* Move it to the dpm_off list */
|
||||
if (!error)
|
||||
list_move(&dev->power.entry, &dpm_off);
|
||||
}
|
||||
if (error)
|
||||
printk(KERN_ERR "Could not suspend device %s: "
|
||||
"error %d%s\n",
|
||||
kobject_name(&dev->kobj), error,
|
||||
error == -EAGAIN ? " (please convert to suspend_late)" : "");
|
||||
put_device(dev);
|
||||
}
|
||||
mutex_unlock(&dpm_list_mtx);
|
||||
if (error)
|
||||
dpm_resume();
|
||||
|
||||
mutex_unlock(&dpm_mtx);
|
||||
return error;
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL_GPL(device_suspend);
|
||||
|
||||
/**
|
||||
* device_power_down - Shut down special devices.
|
||||
* @state: Power state to enter.
|
||||
*
|
||||
* Walk the dpm_off_irq list, calling ->power_down() for each device that
|
||||
* couldn't power down the device with interrupts enabled. When we're
|
||||
* done, power down system devices.
|
||||
*/
|
||||
|
||||
int device_power_down(pm_message_t state)
|
||||
{
|
||||
int error = 0;
|
||||
struct device * dev;
|
||||
|
||||
while (!list_empty(&dpm_off)) {
|
||||
struct list_head * entry = dpm_off.prev;
|
||||
|
||||
dev = to_device(entry);
|
||||
error = suspend_device_late(dev, state);
|
||||
if (error)
|
||||
goto Error;
|
||||
list_move(&dev->power.entry, &dpm_off_irq);
|
||||
}
|
||||
|
||||
error = sysdev_suspend(state);
|
||||
Done:
|
||||
return error;
|
||||
Error:
|
||||
printk(KERN_ERR "Could not power down device %s: "
|
||||
"error %d\n", kobject_name(&dev->kobj), error);
|
||||
dpm_power_up();
|
||||
goto Done;
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL_GPL(device_power_down);
|
||||
|
||||
void __suspend_report_result(const char *function, void *fn, int ret)
|
||||
{
|
||||
if (ret) {
|
||||
printk(KERN_ERR "%s(): ", function);
|
||||
print_fn_descriptor_symbol("%s() returns ", (unsigned long)fn);
|
||||
printk("%d\n", ret);
|
||||
}
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(__suspend_report_result);
|
||||
Loading…
Reference in New Issue
Block a user