mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-18 18:23:53 +08:00
eb9d0fe40e
* Introduce function acpi_pm_device_sleep_wake() for enabling and disabling the system wake-up capability of devices that are power manageable by ACPI. * Introduce function acpi_bus_can_wakeup() allowing other (dependent) subsystems to check if ACPI is able to enable the system wake-up capability of given device. * Introduce callback .sleep_wake() in struct pci_platform_pm_ops and for the ACPI PCI 'driver' make it use acpi_pm_device_sleep_wake(). * Introduce callback .can_wakeup() in struct pci_platform_pm_ops and for the ACPI 'driver' make it use acpi_bus_can_wakeup(). * Move the PME# handlig code out of pci_enable_wake() and split it into two functions, pci_pme_capable() and pci_pme_active(), allowing the caller to check if given device is capable of generating PME# from given power state and to enable/disable the device's PME# functionality, respectively. * Modify pci_enable_wake() to use the new ACPI callbacks and the new PME#-related functions. * Drop the generic .platform_enable_wakeup() callback that is not used any more. * Introduce device_set_wakeup_capable() that will set the power.can_wakeup flag of given device. * Rework PCI device PM initialization so that, if given device is capable of generating wake-up events, either natively through the PME# mechanism, or with the help of the platform, its power.can_wakeup flag is set and its power.should_wakeup flag is unset as appropriate. * Make ACPI set the power.can_wakeup flag for devices found to be wake-up capable by it. * Make the ACPI wake-up code enable/disable GPEs for devices that have the wakeup.flags.prepared flag set (which means that their wake-up power has been enabled). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
99 lines
2.9 KiB
C
99 lines
2.9 KiB
C
/*
|
|
* drivers/base/power/sysfs.c - sysfs entries for device PM
|
|
*/
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/string.h>
|
|
#include "power.h"
|
|
|
|
/*
|
|
* wakeup - Report/change current wakeup option for device
|
|
*
|
|
* Some devices support "wakeup" events, which are hardware signals
|
|
* used to activate devices from suspended or low power states. Such
|
|
* devices have one of three values for the sysfs power/wakeup file:
|
|
*
|
|
* + "enabled\n" to issue the events;
|
|
* + "disabled\n" not to do so; or
|
|
* + "\n" for temporary or permanent inability to issue wakeup.
|
|
*
|
|
* (For example, unconfigured USB devices can't issue wakeups.)
|
|
*
|
|
* Familiar examples of devices that can issue wakeup events include
|
|
* keyboards and mice (both PS2 and USB styles), power buttons, modems,
|
|
* "Wake-On-LAN" Ethernet links, GPIO lines, and more. Some events
|
|
* will wake the entire system from a suspend state; others may just
|
|
* wake up the device (if the system as a whole is already active).
|
|
* Some wakeup events use normal IRQ lines; other use special out
|
|
* of band signaling.
|
|
*
|
|
* It is the responsibility of device drivers to enable (or disable)
|
|
* wakeup signaling as part of changing device power states, respecting
|
|
* the policy choices provided through the driver model.
|
|
*
|
|
* Devices may not be able to generate wakeup events from all power
|
|
* states. Also, the events may be ignored in some configurations;
|
|
* for example, they might need help from other devices that aren't
|
|
* active, or which may have wakeup disabled. Some drivers rely on
|
|
* wakeup events internally (unless they are disabled), keeping
|
|
* their hardware in low power modes whenever they're unused. This
|
|
* saves runtime power, without requiring system-wide sleep states.
|
|
*/
|
|
|
|
static const char enabled[] = "enabled";
|
|
static const char disabled[] = "disabled";
|
|
|
|
static ssize_t
|
|
wake_show(struct device * dev, struct device_attribute *attr, char * buf)
|
|
{
|
|
return sprintf(buf, "%s\n", device_can_wakeup(dev)
|
|
? (device_may_wakeup(dev) ? enabled : disabled)
|
|
: "");
|
|
}
|
|
|
|
static ssize_t
|
|
wake_store(struct device * dev, struct device_attribute *attr,
|
|
const char * buf, size_t n)
|
|
{
|
|
char *cp;
|
|
int len = n;
|
|
|
|
if (!device_can_wakeup(dev))
|
|
return -EINVAL;
|
|
|
|
cp = memchr(buf, '\n', n);
|
|
if (cp)
|
|
len = cp - buf;
|
|
if (len == sizeof enabled - 1
|
|
&& strncmp(buf, enabled, sizeof enabled - 1) == 0)
|
|
device_set_wakeup_enable(dev, 1);
|
|
else if (len == sizeof disabled - 1
|
|
&& strncmp(buf, disabled, sizeof disabled - 1) == 0)
|
|
device_set_wakeup_enable(dev, 0);
|
|
else
|
|
return -EINVAL;
|
|
return n;
|
|
}
|
|
|
|
static DEVICE_ATTR(wakeup, 0644, wake_show, wake_store);
|
|
|
|
|
|
static struct attribute * power_attrs[] = {
|
|
&dev_attr_wakeup.attr,
|
|
NULL,
|
|
};
|
|
static struct attribute_group pm_attr_group = {
|
|
.name = "power",
|
|
.attrs = power_attrs,
|
|
};
|
|
|
|
int dpm_sysfs_add(struct device * dev)
|
|
{
|
|
return sysfs_create_group(&dev->kobj, &pm_attr_group);
|
|
}
|
|
|
|
void dpm_sysfs_remove(struct device * dev)
|
|
{
|
|
sysfs_remove_group(&dev->kobj, &pm_attr_group);
|
|
}
|