forked from Minki/linux
1b6bc32f0a
Most of these files were implicitly getting EXPORT_SYMBOL via device.h which was including module.h, but that path will be broken soon. [ with input from Stephen Rothwell <sfr@canb.auug.org.au> ] Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
544 lines
15 KiB
C
544 lines
15 KiB
C
/*
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* drivers/base/power/sysfs.c - sysfs entries for device PM
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*/
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#include <linux/device.h>
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#include <linux/string.h>
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#include <linux/export.h>
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#include <linux/pm_runtime.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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* 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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static const char enabled[] = "enabled";
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static const char disabled[] = "disabled";
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const char power_group_name[] = "power";
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EXPORT_SYMBOL_GPL(power_group_name);
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#ifdef CONFIG_PM_RUNTIME
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static const char ctrl_auto[] = "auto";
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static const char ctrl_on[] = "on";
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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 sprintf(buf, "%s\n",
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dev->power.runtime_auto ? ctrl_auto : ctrl_on);
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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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char *cp;
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int len = n;
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cp = memchr(buf, '\n', n);
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if (cp)
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len = cp - buf;
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device_lock(dev);
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if (len == sizeof ctrl_auto - 1 && strncmp(buf, ctrl_auto, len) == 0)
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pm_runtime_allow(dev);
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else if (len == sizeof ctrl_on - 1 && strncmp(buf, ctrl_on, len) == 0)
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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(control, 0644, control_show, control_store);
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static ssize_t rtpm_active_time_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int ret;
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spin_lock_irq(&dev->power.lock);
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update_pm_runtime_accounting(dev);
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ret = sprintf(buf, "%i\n", jiffies_to_msecs(dev->power.active_jiffies));
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spin_unlock_irq(&dev->power.lock);
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return ret;
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}
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static DEVICE_ATTR(runtime_active_time, 0444, rtpm_active_time_show, NULL);
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static ssize_t rtpm_suspended_time_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int ret;
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spin_lock_irq(&dev->power.lock);
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update_pm_runtime_accounting(dev);
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ret = sprintf(buf, "%i\n",
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jiffies_to_msecs(dev->power.suspended_jiffies));
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spin_unlock_irq(&dev->power.lock);
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return ret;
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}
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static DEVICE_ATTR(runtime_suspended_time, 0444, rtpm_suspended_time_show, NULL);
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static ssize_t rtpm_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 *p;
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if (dev->power.runtime_error) {
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p = "error\n";
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} else if (dev->power.disable_depth) {
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p = "unsupported\n";
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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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p = "suspended\n";
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break;
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case RPM_SUSPENDING:
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p = "suspending\n";
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break;
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case RPM_RESUMING:
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p = "resuming\n";
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break;
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case RPM_ACTIVE:
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p = "active\n";
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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 sprintf(buf, p);
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}
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static DEVICE_ATTR(runtime_status, 0444, rtpm_status_show, NULL);
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static ssize_t autosuspend_delay_ms_show(struct device *dev,
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struct device_attribute *attr, 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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return sprintf(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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if (!dev->power.use_autosuspend)
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return -EIO;
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if (strict_strtol(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(autosuspend_delay_ms, 0644, autosuspend_delay_ms_show,
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autosuspend_delay_ms_store);
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#endif /* CONFIG_PM_RUNTIME */
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#ifdef CONFIG_PM_SLEEP
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static ssize_t
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wake_show(struct device * dev, struct device_attribute *attr, char * buf)
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{
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return sprintf(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
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wake_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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char *cp;
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int len = n;
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if (!device_can_wakeup(dev))
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return -EINVAL;
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cp = memchr(buf, '\n', n);
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if (cp)
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len = cp - buf;
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if (len == sizeof enabled - 1
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&& strncmp(buf, enabled, sizeof enabled - 1) == 0)
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device_set_wakeup_enable(dev, 1);
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else if (len == sizeof disabled - 1
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&& strncmp(buf, disabled, sizeof disabled - 1) == 0)
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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(wakeup, 0644, wake_show, wake_store);
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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 = 0;
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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->event_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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return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
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}
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static DEVICE_ATTR(wakeup_count, 0444, wakeup_count_show, NULL);
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static ssize_t wakeup_active_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 = 0;
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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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return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
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}
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static DEVICE_ATTR(wakeup_active_count, 0444, wakeup_active_count_show, NULL);
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static ssize_t wakeup_hit_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 = 0;
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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->hit_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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return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
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}
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static DEVICE_ATTR(wakeup_hit_count, 0444, wakeup_hit_count_show, NULL);
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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 = 0;
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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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return enabled ? sprintf(buf, "%u\n", active) : sprintf(buf, "\n");
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}
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static DEVICE_ATTR(wakeup_active, 0444, wakeup_active_show, NULL);
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static ssize_t wakeup_total_time_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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s64 msec = 0;
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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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return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
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}
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static DEVICE_ATTR(wakeup_total_time_ms, 0444, wakeup_total_time_show, NULL);
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static ssize_t wakeup_max_time_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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s64 msec = 0;
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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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return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
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}
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static DEVICE_ATTR(wakeup_max_time_ms, 0444, wakeup_max_time_show, NULL);
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static ssize_t wakeup_last_time_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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s64 msec = 0;
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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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return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
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}
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static DEVICE_ATTR(wakeup_last_time_ms, 0444, wakeup_last_time_show, NULL);
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#endif /* CONFIG_PM_SLEEP */
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#ifdef CONFIG_PM_ADVANCED_DEBUG
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#ifdef CONFIG_PM_RUNTIME
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static ssize_t rtpm_usagecount_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "%d\n", atomic_read(&dev->power.usage_count));
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}
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static ssize_t rtpm_children_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return sprintf(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 ssize_t rtpm_enabled_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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if ((dev->power.disable_depth) && (dev->power.runtime_auto == false))
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return sprintf(buf, "disabled & forbidden\n");
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else if (dev->power.disable_depth)
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return sprintf(buf, "disabled\n");
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else if (dev->power.runtime_auto == false)
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return sprintf(buf, "forbidden\n");
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return sprintf(buf, "enabled\n");
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}
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static DEVICE_ATTR(runtime_usage, 0444, rtpm_usagecount_show, NULL);
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static DEVICE_ATTR(runtime_active_kids, 0444, rtpm_children_show, NULL);
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static DEVICE_ATTR(runtime_enabled, 0444, rtpm_enabled_show, NULL);
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#endif
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static ssize_t async_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "%s\n",
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device_async_suspend_enabled(dev) ? enabled : disabled);
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}
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static ssize_t async_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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char *cp;
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int len = n;
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cp = memchr(buf, '\n', n);
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if (cp)
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len = cp - buf;
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if (len == sizeof enabled - 1 && strncmp(buf, enabled, len) == 0)
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device_enable_async_suspend(dev);
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else if (len == sizeof disabled - 1 && strncmp(buf, disabled, len) == 0)
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device_disable_async_suspend(dev);
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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(async, 0644, async_show, async_store);
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#endif /* CONFIG_PM_ADVANCED_DEBUG */
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static struct attribute *power_attrs[] = {
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#ifdef CONFIG_PM_ADVANCED_DEBUG
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#ifdef CONFIG_PM_SLEEP
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&dev_attr_async.attr,
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#endif
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#ifdef CONFIG_PM_RUNTIME
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&dev_attr_runtime_status.attr,
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&dev_attr_runtime_usage.attr,
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&dev_attr_runtime_active_kids.attr,
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&dev_attr_runtime_enabled.attr,
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#endif
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#endif /* CONFIG_PM_ADVANCED_DEBUG */
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NULL,
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};
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static struct attribute_group pm_attr_group = {
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.name = power_group_name,
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.attrs = power_attrs,
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};
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static struct attribute *wakeup_attrs[] = {
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#ifdef CONFIG_PM_SLEEP
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&dev_attr_wakeup.attr,
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&dev_attr_wakeup_count.attr,
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&dev_attr_wakeup_active_count.attr,
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&dev_attr_wakeup_hit_count.attr,
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&dev_attr_wakeup_active.attr,
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&dev_attr_wakeup_total_time_ms.attr,
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&dev_attr_wakeup_max_time_ms.attr,
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&dev_attr_wakeup_last_time_ms.attr,
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#endif
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NULL,
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};
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static struct attribute_group pm_wakeup_attr_group = {
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.name = power_group_name,
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.attrs = wakeup_attrs,
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};
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static struct attribute *runtime_attrs[] = {
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#ifdef CONFIG_PM_RUNTIME
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#ifndef CONFIG_PM_ADVANCED_DEBUG
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&dev_attr_runtime_status.attr,
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#endif
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&dev_attr_control.attr,
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&dev_attr_runtime_suspended_time.attr,
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&dev_attr_runtime_active_time.attr,
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&dev_attr_autosuspend_delay_ms.attr,
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#endif /* CONFIG_PM_RUNTIME */
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NULL,
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};
|
|
static struct attribute_group pm_runtime_attr_group = {
|
|
.name = power_group_name,
|
|
.attrs = runtime_attrs,
|
|
};
|
|
|
|
int dpm_sysfs_add(struct device *dev)
|
|
{
|
|
int rc;
|
|
|
|
rc = sysfs_create_group(&dev->kobj, &pm_attr_group);
|
|
if (rc)
|
|
return rc;
|
|
|
|
if (pm_runtime_callbacks_present(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) {
|
|
if (pm_runtime_callbacks_present(dev))
|
|
sysfs_unmerge_group(&dev->kobj,
|
|
&pm_runtime_attr_group);
|
|
goto err_out;
|
|
}
|
|
}
|
|
return 0;
|
|
|
|
err_out:
|
|
sysfs_remove_group(&dev->kobj, &pm_attr_group);
|
|
return rc;
|
|
}
|
|
|
|
int wakeup_sysfs_add(struct device *dev)
|
|
{
|
|
return sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group);
|
|
}
|
|
|
|
void wakeup_sysfs_remove(struct device *dev)
|
|
{
|
|
sysfs_unmerge_group(&dev->kobj, &pm_wakeup_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)
|
|
{
|
|
rpm_sysfs_remove(dev);
|
|
sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
|
|
sysfs_remove_group(&dev->kobj, &pm_attr_group);
|
|
}
|