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838 lines
21 KiB
838 lines
21 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* sysfs entries for device PM */ |
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#include <linux/device.h> |
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#include <linux/kobject.h> |
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#include <linux/string.h> |
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#include <linux/export.h> |
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#include <linux/pm_qos.h> |
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#include <linux/pm_runtime.h> |
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#include <linux/pm_wakeup.h> |
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#include <linux/atomic.h> |
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#include <linux/jiffies.h> |
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#include "power.h" |
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|
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/* |
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* control - Report/change current runtime PM setting of the device |
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* |
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* Runtime power management of a device can be blocked with the help of |
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* this attribute. All devices have one of the following two values for |
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* the power/control file: |
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* |
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* + "auto\n" to allow the device to be power managed at run time; |
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* + "on\n" to prevent the device from being power managed at run time; |
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* |
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* The default for all devices is "auto", which means that devices may be |
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* subject to automatic power management, depending on their drivers. |
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* Changing this attribute to "on" prevents the driver from power managing |
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* the device at run time. Doing that while the device is suspended causes |
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* it to be woken up. |
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* |
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* wakeup - Report/change current wakeup option for device |
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* |
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* Some devices support "wakeup" events, which are hardware signals |
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* used to activate devices from suspended or low power states. Such |
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* devices have one of three values for the sysfs power/wakeup file: |
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* |
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* + "enabled\n" to issue the events; |
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* + "disabled\n" not to do so; or |
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* + "\n" for temporary or permanent inability to issue wakeup. |
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* |
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* (For example, unconfigured USB devices can't issue wakeups.) |
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* |
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* Familiar examples of devices that can issue wakeup events include |
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* keyboards and mice (both PS2 and USB styles), power buttons, modems, |
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* "Wake-On-LAN" Ethernet links, GPIO lines, and more. Some events |
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* will wake the entire system from a suspend state; others may just |
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* wake up the device (if the system as a whole is already active). |
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* Some wakeup events use normal IRQ lines; other use special out |
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* of band signaling. |
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* |
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* It is the responsibility of device drivers to enable (or disable) |
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* wakeup signaling as part of changing device power states, respecting |
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* the policy choices provided through the driver model. |
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* |
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* Devices may not be able to generate wakeup events from all power |
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* states. Also, the events may be ignored in some configurations; |
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* for example, they might need help from other devices that aren't |
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* active, or which may have wakeup disabled. Some drivers rely on |
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* wakeup events internally (unless they are disabled), keeping |
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* their hardware in low power modes whenever they're unused. This |
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* saves runtime power, without requiring system-wide sleep states. |
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* |
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* async - Report/change current async suspend setting for the device |
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* |
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* Asynchronous suspend and resume of the device during system-wide power |
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* state transitions can be enabled by writing "enabled" to this file. |
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* Analogously, if "disabled" is written to this file, the device will be |
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* suspended and resumed synchronously. |
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* |
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* All devices have one of the following two values for power/async: |
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* |
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* + "enabled\n" to permit the asynchronous suspend/resume of the device; |
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* + "disabled\n" to forbid it; |
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* |
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* NOTE: It generally is unsafe to permit the asynchronous suspend/resume |
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* of a device unless it is certain that all of the PM dependencies of the |
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* device are known to the PM core. However, for some devices this |
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* attribute is set to "enabled" by bus type code or device drivers and in |
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* that cases it should be safe to leave the default value. |
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* |
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* autosuspend_delay_ms - Report/change a device's autosuspend_delay value |
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* |
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* Some drivers don't want to carry out a runtime suspend as soon as a |
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* device becomes idle; they want it always to remain idle for some period |
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* of time before suspending it. This period is the autosuspend_delay |
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* value (expressed in milliseconds) and it can be controlled by the user. |
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* If the value is negative then the device will never be runtime |
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* suspended. |
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* |
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* NOTE: The autosuspend_delay_ms attribute and the autosuspend_delay |
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* value are used only if the driver calls pm_runtime_use_autosuspend(). |
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* |
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* wakeup_count - Report the number of wakeup events related to the device |
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*/ |
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|
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const char power_group_name[] = "power"; |
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EXPORT_SYMBOL_GPL(power_group_name); |
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|
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static const char ctrl_auto[] = "auto"; |
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static const char ctrl_on[] = "on"; |
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|
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static ssize_t control_show(struct device *dev, struct device_attribute *attr, |
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char *buf) |
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{ |
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return sysfs_emit(buf, "%s\n", |
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dev->power.runtime_auto ? ctrl_auto : ctrl_on); |
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} |
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|
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static ssize_t control_store(struct device * dev, struct device_attribute *attr, |
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const char * buf, size_t n) |
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{ |
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device_lock(dev); |
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if (sysfs_streq(buf, ctrl_auto)) |
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pm_runtime_allow(dev); |
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else if (sysfs_streq(buf, ctrl_on)) |
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pm_runtime_forbid(dev); |
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else |
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n = -EINVAL; |
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device_unlock(dev); |
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return n; |
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} |
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static DEVICE_ATTR_RW(control); |
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static ssize_t runtime_active_time_show(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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u64 tmp = pm_runtime_active_time(dev); |
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|
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do_div(tmp, NSEC_PER_MSEC); |
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|
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return sysfs_emit(buf, "%llu\n", tmp); |
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} |
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static DEVICE_ATTR_RO(runtime_active_time); |
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|
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static ssize_t runtime_suspended_time_show(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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u64 tmp = pm_runtime_suspended_time(dev); |
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|
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do_div(tmp, NSEC_PER_MSEC); |
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|
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return sysfs_emit(buf, "%llu\n", tmp); |
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} |
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static DEVICE_ATTR_RO(runtime_suspended_time); |
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|
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static ssize_t runtime_status_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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const char *output; |
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|
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if (dev->power.runtime_error) { |
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output = "error"; |
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} else if (dev->power.disable_depth) { |
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output = "unsupported"; |
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} else { |
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switch (dev->power.runtime_status) { |
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case RPM_SUSPENDED: |
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output = "suspended"; |
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break; |
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case RPM_SUSPENDING: |
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output = "suspending"; |
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break; |
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case RPM_RESUMING: |
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output = "resuming"; |
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break; |
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case RPM_ACTIVE: |
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output = "active"; |
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break; |
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default: |
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return -EIO; |
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} |
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} |
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return sysfs_emit(buf, "%s\n", output); |
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} |
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|
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static DEVICE_ATTR_RO(runtime_status); |
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static ssize_t autosuspend_delay_ms_show(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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if (!dev->power.use_autosuspend) |
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return -EIO; |
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|
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return sysfs_emit(buf, "%d\n", dev->power.autosuspend_delay); |
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} |
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static ssize_t autosuspend_delay_ms_store(struct device *dev, |
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struct device_attribute *attr, const char *buf, size_t n) |
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{ |
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long delay; |
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|
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if (!dev->power.use_autosuspend) |
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return -EIO; |
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if (kstrtol(buf, 10, &delay) != 0 || delay != (int) delay) |
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return -EINVAL; |
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device_lock(dev); |
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pm_runtime_set_autosuspend_delay(dev, delay); |
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device_unlock(dev); |
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return n; |
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} |
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static DEVICE_ATTR_RW(autosuspend_delay_ms); |
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|
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static ssize_t pm_qos_resume_latency_us_show(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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s32 value = dev_pm_qos_requested_resume_latency(dev); |
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if (value == 0) |
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return sysfs_emit(buf, "n/a\n"); |
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if (value == PM_QOS_RESUME_LATENCY_NO_CONSTRAINT) |
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value = 0; |
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return sysfs_emit(buf, "%d\n", value); |
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} |
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static ssize_t pm_qos_resume_latency_us_store(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, size_t n) |
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{ |
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s32 value; |
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int ret; |
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|
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if (!kstrtos32(buf, 0, &value)) { |
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/* |
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* Prevent users from writing negative or "no constraint" values |
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* directly. |
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*/ |
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if (value < 0 || value == PM_QOS_RESUME_LATENCY_NO_CONSTRAINT) |
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return -EINVAL; |
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if (value == 0) |
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value = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT; |
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} else if (sysfs_streq(buf, "n/a")) { |
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value = 0; |
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} else { |
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return -EINVAL; |
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} |
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ret = dev_pm_qos_update_request(dev->power.qos->resume_latency_req, |
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value); |
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return ret < 0 ? ret : n; |
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} |
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static DEVICE_ATTR_RW(pm_qos_resume_latency_us); |
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static ssize_t pm_qos_latency_tolerance_us_show(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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s32 value = dev_pm_qos_get_user_latency_tolerance(dev); |
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if (value < 0) |
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return sysfs_emit(buf, "%s\n", "auto"); |
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if (value == PM_QOS_LATENCY_ANY) |
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return sysfs_emit(buf, "%s\n", "any"); |
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return sysfs_emit(buf, "%d\n", value); |
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} |
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static ssize_t pm_qos_latency_tolerance_us_store(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, size_t n) |
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{ |
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s32 value; |
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int ret; |
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if (kstrtos32(buf, 0, &value) == 0) { |
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/* Users can't write negative values directly */ |
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if (value < 0) |
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return -EINVAL; |
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} else { |
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if (sysfs_streq(buf, "auto")) |
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value = PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT; |
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else if (sysfs_streq(buf, "any")) |
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value = PM_QOS_LATENCY_ANY; |
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else |
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return -EINVAL; |
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} |
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ret = dev_pm_qos_update_user_latency_tolerance(dev, value); |
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return ret < 0 ? ret : n; |
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} |
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static DEVICE_ATTR_RW(pm_qos_latency_tolerance_us); |
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static ssize_t pm_qos_no_power_off_show(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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return sysfs_emit(buf, "%d\n", !!(dev_pm_qos_requested_flags(dev) |
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& PM_QOS_FLAG_NO_POWER_OFF)); |
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} |
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static ssize_t pm_qos_no_power_off_store(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, size_t n) |
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{ |
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int ret; |
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if (kstrtoint(buf, 0, &ret)) |
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return -EINVAL; |
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if (ret != 0 && ret != 1) |
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return -EINVAL; |
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ret = dev_pm_qos_update_flags(dev, PM_QOS_FLAG_NO_POWER_OFF, ret); |
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return ret < 0 ? ret : n; |
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} |
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static DEVICE_ATTR_RW(pm_qos_no_power_off); |
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#ifdef CONFIG_PM_SLEEP |
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static const char _enabled[] = "enabled"; |
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static const char _disabled[] = "disabled"; |
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static ssize_t wakeup_show(struct device *dev, struct device_attribute *attr, |
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char *buf) |
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{ |
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return sysfs_emit(buf, "%s\n", device_can_wakeup(dev) |
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? (device_may_wakeup(dev) ? _enabled : _disabled) |
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: ""); |
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} |
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static ssize_t wakeup_store(struct device *dev, struct device_attribute *attr, |
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const char *buf, size_t n) |
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{ |
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if (!device_can_wakeup(dev)) |
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return -EINVAL; |
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if (sysfs_streq(buf, _enabled)) |
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device_set_wakeup_enable(dev, 1); |
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else if (sysfs_streq(buf, _disabled)) |
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device_set_wakeup_enable(dev, 0); |
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else |
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return -EINVAL; |
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return n; |
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} |
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static DEVICE_ATTR_RW(wakeup); |
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static ssize_t wakeup_count_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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unsigned long count; |
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bool enabled = false; |
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spin_lock_irq(&dev->power.lock); |
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if (dev->power.wakeup) { |
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count = dev->power.wakeup->wakeup_count; |
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enabled = true; |
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} |
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spin_unlock_irq(&dev->power.lock); |
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if (!enabled) |
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return sysfs_emit(buf, "\n"); |
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return sysfs_emit(buf, "%lu\n", count); |
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} |
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static DEVICE_ATTR_RO(wakeup_count); |
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static ssize_t wakeup_active_count_show(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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unsigned long count; |
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bool enabled = false; |
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spin_lock_irq(&dev->power.lock); |
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if (dev->power.wakeup) { |
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count = dev->power.wakeup->active_count; |
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enabled = true; |
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} |
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spin_unlock_irq(&dev->power.lock); |
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if (!enabled) |
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return sysfs_emit(buf, "\n"); |
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return sysfs_emit(buf, "%lu\n", count); |
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} |
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static DEVICE_ATTR_RO(wakeup_active_count); |
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static ssize_t wakeup_abort_count_show(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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unsigned long count; |
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bool enabled = false; |
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spin_lock_irq(&dev->power.lock); |
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if (dev->power.wakeup) { |
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count = dev->power.wakeup->wakeup_count; |
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enabled = true; |
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} |
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spin_unlock_irq(&dev->power.lock); |
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if (!enabled) |
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return sysfs_emit(buf, "\n"); |
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return sysfs_emit(buf, "%lu\n", count); |
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} |
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static DEVICE_ATTR_RO(wakeup_abort_count); |
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static ssize_t wakeup_expire_count_show(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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unsigned long count; |
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bool enabled = false; |
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spin_lock_irq(&dev->power.lock); |
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if (dev->power.wakeup) { |
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count = dev->power.wakeup->expire_count; |
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enabled = true; |
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} |
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spin_unlock_irq(&dev->power.lock); |
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if (!enabled) |
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return sysfs_emit(buf, "\n"); |
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return sysfs_emit(buf, "%lu\n", count); |
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} |
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static DEVICE_ATTR_RO(wakeup_expire_count); |
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static ssize_t wakeup_active_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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unsigned int active; |
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bool enabled = false; |
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spin_lock_irq(&dev->power.lock); |
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if (dev->power.wakeup) { |
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active = dev->power.wakeup->active; |
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enabled = true; |
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} |
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spin_unlock_irq(&dev->power.lock); |
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if (!enabled) |
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return sysfs_emit(buf, "\n"); |
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return sysfs_emit(buf, "%u\n", active); |
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} |
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static DEVICE_ATTR_RO(wakeup_active); |
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static ssize_t wakeup_total_time_ms_show(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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s64 msec; |
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bool enabled = false; |
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spin_lock_irq(&dev->power.lock); |
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if (dev->power.wakeup) { |
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msec = ktime_to_ms(dev->power.wakeup->total_time); |
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enabled = true; |
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} |
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spin_unlock_irq(&dev->power.lock); |
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|
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if (!enabled) |
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return sysfs_emit(buf, "\n"); |
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return sysfs_emit(buf, "%lld\n", msec); |
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} |
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static DEVICE_ATTR_RO(wakeup_total_time_ms); |
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|
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static ssize_t wakeup_max_time_ms_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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s64 msec; |
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bool enabled = false; |
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spin_lock_irq(&dev->power.lock); |
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if (dev->power.wakeup) { |
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msec = ktime_to_ms(dev->power.wakeup->max_time); |
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enabled = true; |
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} |
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spin_unlock_irq(&dev->power.lock); |
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|
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if (!enabled) |
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return sysfs_emit(buf, "\n"); |
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return sysfs_emit(buf, "%lld\n", msec); |
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} |
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|
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static DEVICE_ATTR_RO(wakeup_max_time_ms); |
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|
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static ssize_t wakeup_last_time_ms_show(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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s64 msec; |
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bool enabled = false; |
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spin_lock_irq(&dev->power.lock); |
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if (dev->power.wakeup) { |
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msec = ktime_to_ms(dev->power.wakeup->last_time); |
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enabled = true; |
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} |
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spin_unlock_irq(&dev->power.lock); |
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|
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if (!enabled) |
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return sysfs_emit(buf, "\n"); |
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return sysfs_emit(buf, "%lld\n", msec); |
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} |
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|
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static inline int dpm_sysfs_wakeup_change_owner(struct device *dev, kuid_t kuid, |
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kgid_t kgid) |
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{ |
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if (dev->power.wakeup && dev->power.wakeup->dev) |
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return device_change_owner(dev->power.wakeup->dev, kuid, kgid); |
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return 0; |
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} |
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|
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static DEVICE_ATTR_RO(wakeup_last_time_ms); |
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|
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#ifdef CONFIG_PM_AUTOSLEEP |
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static ssize_t wakeup_prevent_sleep_time_ms_show(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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s64 msec; |
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bool enabled = false; |
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|
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spin_lock_irq(&dev->power.lock); |
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if (dev->power.wakeup) { |
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msec = ktime_to_ms(dev->power.wakeup->prevent_sleep_time); |
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enabled = true; |
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} |
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spin_unlock_irq(&dev->power.lock); |
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|
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if (!enabled) |
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return sysfs_emit(buf, "\n"); |
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return sysfs_emit(buf, "%lld\n", msec); |
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} |
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|
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static DEVICE_ATTR_RO(wakeup_prevent_sleep_time_ms); |
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#endif /* CONFIG_PM_AUTOSLEEP */ |
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#else /* CONFIG_PM_SLEEP */ |
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static inline int dpm_sysfs_wakeup_change_owner(struct device *dev, kuid_t kuid, |
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kgid_t kgid) |
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{ |
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return 0; |
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} |
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#endif |
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|
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#ifdef CONFIG_PM_ADVANCED_DEBUG |
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static ssize_t runtime_usage_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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return sysfs_emit(buf, "%d\n", atomic_read(&dev->power.usage_count)); |
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} |
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static DEVICE_ATTR_RO(runtime_usage); |
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|
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static ssize_t runtime_active_kids_show(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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return sysfs_emit(buf, "%d\n", dev->power.ignore_children ? |
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0 : atomic_read(&dev->power.child_count)); |
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} |
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static DEVICE_ATTR_RO(runtime_active_kids); |
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|
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static ssize_t runtime_enabled_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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const char *output; |
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|
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if (dev->power.disable_depth && !dev->power.runtime_auto) |
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output = "disabled & forbidden"; |
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else if (dev->power.disable_depth) |
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output = "disabled"; |
|
else if (!dev->power.runtime_auto) |
|
output = "forbidden"; |
|
else |
|
output = "enabled"; |
|
|
|
return sysfs_emit(buf, "%s\n", output); |
|
} |
|
static DEVICE_ATTR_RO(runtime_enabled); |
|
|
|
#ifdef CONFIG_PM_SLEEP |
|
static ssize_t async_show(struct device *dev, struct device_attribute *attr, |
|
char *buf) |
|
{ |
|
return sysfs_emit(buf, "%s\n", |
|
device_async_suspend_enabled(dev) ? |
|
_enabled : _disabled); |
|
} |
|
|
|
static ssize_t async_store(struct device *dev, struct device_attribute *attr, |
|
const char *buf, size_t n) |
|
{ |
|
if (sysfs_streq(buf, _enabled)) |
|
device_enable_async_suspend(dev); |
|
else if (sysfs_streq(buf, _disabled)) |
|
device_disable_async_suspend(dev); |
|
else |
|
return -EINVAL; |
|
return n; |
|
} |
|
|
|
static DEVICE_ATTR_RW(async); |
|
|
|
#endif /* CONFIG_PM_SLEEP */ |
|
#endif /* CONFIG_PM_ADVANCED_DEBUG */ |
|
|
|
static struct attribute *power_attrs[] = { |
|
#ifdef CONFIG_PM_ADVANCED_DEBUG |
|
#ifdef CONFIG_PM_SLEEP |
|
&dev_attr_async.attr, |
|
#endif |
|
&dev_attr_runtime_status.attr, |
|
&dev_attr_runtime_usage.attr, |
|
&dev_attr_runtime_active_kids.attr, |
|
&dev_attr_runtime_enabled.attr, |
|
#endif /* CONFIG_PM_ADVANCED_DEBUG */ |
|
NULL, |
|
}; |
|
static const struct attribute_group pm_attr_group = { |
|
.name = power_group_name, |
|
.attrs = power_attrs, |
|
}; |
|
|
|
static struct attribute *wakeup_attrs[] = { |
|
#ifdef CONFIG_PM_SLEEP |
|
&dev_attr_wakeup.attr, |
|
&dev_attr_wakeup_count.attr, |
|
&dev_attr_wakeup_active_count.attr, |
|
&dev_attr_wakeup_abort_count.attr, |
|
&dev_attr_wakeup_expire_count.attr, |
|
&dev_attr_wakeup_active.attr, |
|
&dev_attr_wakeup_total_time_ms.attr, |
|
&dev_attr_wakeup_max_time_ms.attr, |
|
&dev_attr_wakeup_last_time_ms.attr, |
|
#ifdef CONFIG_PM_AUTOSLEEP |
|
&dev_attr_wakeup_prevent_sleep_time_ms.attr, |
|
#endif |
|
#endif |
|
NULL, |
|
}; |
|
static const struct attribute_group pm_wakeup_attr_group = { |
|
.name = power_group_name, |
|
.attrs = wakeup_attrs, |
|
}; |
|
|
|
static struct attribute *runtime_attrs[] = { |
|
#ifndef CONFIG_PM_ADVANCED_DEBUG |
|
&dev_attr_runtime_status.attr, |
|
#endif |
|
&dev_attr_control.attr, |
|
&dev_attr_runtime_suspended_time.attr, |
|
&dev_attr_runtime_active_time.attr, |
|
&dev_attr_autosuspend_delay_ms.attr, |
|
NULL, |
|
}; |
|
static const struct attribute_group pm_runtime_attr_group = { |
|
.name = power_group_name, |
|
.attrs = runtime_attrs, |
|
}; |
|
|
|
static struct attribute *pm_qos_resume_latency_attrs[] = { |
|
&dev_attr_pm_qos_resume_latency_us.attr, |
|
NULL, |
|
}; |
|
static const struct attribute_group pm_qos_resume_latency_attr_group = { |
|
.name = power_group_name, |
|
.attrs = pm_qos_resume_latency_attrs, |
|
}; |
|
|
|
static struct attribute *pm_qos_latency_tolerance_attrs[] = { |
|
&dev_attr_pm_qos_latency_tolerance_us.attr, |
|
NULL, |
|
}; |
|
static const struct attribute_group pm_qos_latency_tolerance_attr_group = { |
|
.name = power_group_name, |
|
.attrs = pm_qos_latency_tolerance_attrs, |
|
}; |
|
|
|
static struct attribute *pm_qos_flags_attrs[] = { |
|
&dev_attr_pm_qos_no_power_off.attr, |
|
NULL, |
|
}; |
|
static const struct attribute_group pm_qos_flags_attr_group = { |
|
.name = power_group_name, |
|
.attrs = pm_qos_flags_attrs, |
|
}; |
|
|
|
int dpm_sysfs_add(struct device *dev) |
|
{ |
|
int rc; |
|
|
|
/* No need to create PM sysfs if explicitly disabled. */ |
|
if (device_pm_not_required(dev)) |
|
return 0; |
|
|
|
rc = sysfs_create_group(&dev->kobj, &pm_attr_group); |
|
if (rc) |
|
return rc; |
|
|
|
if (!pm_runtime_has_no_callbacks(dev)) { |
|
rc = sysfs_merge_group(&dev->kobj, &pm_runtime_attr_group); |
|
if (rc) |
|
goto err_out; |
|
} |
|
if (device_can_wakeup(dev)) { |
|
rc = sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group); |
|
if (rc) |
|
goto err_runtime; |
|
} |
|
if (dev->power.set_latency_tolerance) { |
|
rc = sysfs_merge_group(&dev->kobj, |
|
&pm_qos_latency_tolerance_attr_group); |
|
if (rc) |
|
goto err_wakeup; |
|
} |
|
rc = pm_wakeup_source_sysfs_add(dev); |
|
if (rc) |
|
goto err_latency; |
|
return 0; |
|
|
|
err_latency: |
|
sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_tolerance_attr_group); |
|
err_wakeup: |
|
sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group); |
|
err_runtime: |
|
sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group); |
|
err_out: |
|
sysfs_remove_group(&dev->kobj, &pm_attr_group); |
|
return rc; |
|
} |
|
|
|
int dpm_sysfs_change_owner(struct device *dev, kuid_t kuid, kgid_t kgid) |
|
{ |
|
int rc; |
|
|
|
if (device_pm_not_required(dev)) |
|
return 0; |
|
|
|
rc = sysfs_group_change_owner(&dev->kobj, &pm_attr_group, kuid, kgid); |
|
if (rc) |
|
return rc; |
|
|
|
if (!pm_runtime_has_no_callbacks(dev)) { |
|
rc = sysfs_group_change_owner( |
|
&dev->kobj, &pm_runtime_attr_group, kuid, kgid); |
|
if (rc) |
|
return rc; |
|
} |
|
|
|
if (device_can_wakeup(dev)) { |
|
rc = sysfs_group_change_owner(&dev->kobj, &pm_wakeup_attr_group, |
|
kuid, kgid); |
|
if (rc) |
|
return rc; |
|
|
|
rc = dpm_sysfs_wakeup_change_owner(dev, kuid, kgid); |
|
if (rc) |
|
return rc; |
|
} |
|
|
|
if (dev->power.set_latency_tolerance) { |
|
rc = sysfs_group_change_owner( |
|
&dev->kobj, &pm_qos_latency_tolerance_attr_group, kuid, |
|
kgid); |
|
if (rc) |
|
return rc; |
|
} |
|
return 0; |
|
} |
|
|
|
int wakeup_sysfs_add(struct device *dev) |
|
{ |
|
int ret = sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group); |
|
|
|
if (!ret) |
|
kobject_uevent(&dev->kobj, KOBJ_CHANGE); |
|
|
|
return ret; |
|
} |
|
|
|
void wakeup_sysfs_remove(struct device *dev) |
|
{ |
|
sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group); |
|
kobject_uevent(&dev->kobj, KOBJ_CHANGE); |
|
} |
|
|
|
int pm_qos_sysfs_add_resume_latency(struct device *dev) |
|
{ |
|
return sysfs_merge_group(&dev->kobj, &pm_qos_resume_latency_attr_group); |
|
} |
|
|
|
void pm_qos_sysfs_remove_resume_latency(struct device *dev) |
|
{ |
|
sysfs_unmerge_group(&dev->kobj, &pm_qos_resume_latency_attr_group); |
|
} |
|
|
|
int pm_qos_sysfs_add_flags(struct device *dev) |
|
{ |
|
return sysfs_merge_group(&dev->kobj, &pm_qos_flags_attr_group); |
|
} |
|
|
|
void pm_qos_sysfs_remove_flags(struct device *dev) |
|
{ |
|
sysfs_unmerge_group(&dev->kobj, &pm_qos_flags_attr_group); |
|
} |
|
|
|
int pm_qos_sysfs_add_latency_tolerance(struct device *dev) |
|
{ |
|
return sysfs_merge_group(&dev->kobj, |
|
&pm_qos_latency_tolerance_attr_group); |
|
} |
|
|
|
void pm_qos_sysfs_remove_latency_tolerance(struct device *dev) |
|
{ |
|
sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_tolerance_attr_group); |
|
} |
|
|
|
void rpm_sysfs_remove(struct device *dev) |
|
{ |
|
sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group); |
|
} |
|
|
|
void dpm_sysfs_remove(struct device *dev) |
|
{ |
|
if (device_pm_not_required(dev)) |
|
return; |
|
sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_tolerance_attr_group); |
|
dev_pm_qos_constraints_destroy(dev); |
|
rpm_sysfs_remove(dev); |
|
sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group); |
|
sysfs_remove_group(&dev->kobj, &pm_attr_group); |
|
}
|
|
|