2005-04-16 16:20:36 -06:00
|
|
|
/*
|
|
|
|
* 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 different set of lists than the global subsystem list are used to
|
|
|
|
* keep track of power info because we use different lists to hold
|
|
|
|
* devices based on what stage of the power management process they
|
|
|
|
* are in. The power domain dependencies may also differ from the
|
|
|
|
* ancestral dependencies that the subsystem list maintains.
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <linux/device.h>
|
2007-09-21 13:36:56 -06:00
|
|
|
#include <linux/kallsyms.h>
|
2007-05-23 15:19:41 -06:00
|
|
|
#include <linux/mutex.h>
|
2007-09-21 13:36:56 -06:00
|
|
|
#include <linux/pm.h>
|
|
|
|
#include <linux/resume-trace.h>
|
2007-05-23 15:19:41 -06:00
|
|
|
|
2007-09-21 13:36:56 -06:00
|
|
|
#include "../base.h"
|
2005-04-16 16:20:36 -06:00
|
|
|
#include "power.h"
|
|
|
|
|
|
|
|
LIST_HEAD(dpm_active);
|
2007-09-21 13:36:56 -06:00
|
|
|
static LIST_HEAD(dpm_off);
|
|
|
|
static LIST_HEAD(dpm_off_irq);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2007-09-21 13:36:56 -06:00
|
|
|
static DEFINE_MUTEX(dpm_mtx);
|
|
|
|
static DEFINE_MUTEX(dpm_list_mtx);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2007-04-26 01:12:06 -06:00
|
|
|
int (*platform_enable_wakeup)(struct device *dev, int is_on);
|
|
|
|
|
2007-09-21 13:36:56 -06:00
|
|
|
|
2007-06-13 07:53:34 -06:00
|
|
|
int device_pm_add(struct device *dev)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
|
|
|
int error;
|
|
|
|
|
|
|
|
pr_debug("PM: Adding info for %s:%s\n",
|
2007-04-10 23:37:18 -06:00
|
|
|
dev->bus ? dev->bus->name : "No Bus",
|
|
|
|
kobject_name(&dev->kobj));
|
2007-05-23 15:19:41 -06:00
|
|
|
mutex_lock(&dpm_list_mtx);
|
2005-04-16 16:20:36 -06:00
|
|
|
list_add_tail(&dev->power.entry, &dpm_active);
|
2007-06-13 07:53:34 -06:00
|
|
|
error = dpm_sysfs_add(dev);
|
|
|
|
if (error)
|
2005-04-16 16:20:36 -06:00
|
|
|
list_del(&dev->power.entry);
|
2007-05-23 15:19:41 -06:00
|
|
|
mutex_unlock(&dpm_list_mtx);
|
2005-04-16 16:20:36 -06:00
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
2007-06-13 07:53:34 -06:00
|
|
|
void device_pm_remove(struct device *dev)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
|
|
|
pr_debug("PM: Removing info for %s:%s\n",
|
2007-04-10 23:37:18 -06:00
|
|
|
dev->bus ? dev->bus->name : "No Bus",
|
|
|
|
kobject_name(&dev->kobj));
|
2007-05-23 15:19:41 -06:00
|
|
|
mutex_lock(&dpm_list_mtx);
|
2005-04-16 16:20:36 -06:00
|
|
|
dpm_sysfs_remove(dev);
|
|
|
|
list_del_init(&dev->power.entry);
|
2007-05-23 15:19:41 -06:00
|
|
|
mutex_unlock(&dpm_list_mtx);
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
|
2007-09-21 13:36:56 -06:00
|
|
|
/*------------------------- 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);
|