kernel/linux.git/drivers/base/power/sysfs.c, branch v3.6.3

PM / Sleep: Fix build warning in sysfs.c for CONFIG_PM_SLEEP unset

2012-07-12T20:40:02+00:00

The power/async device sysfs attribute is only used if both CONFIG_PM_ADVANCED_DEBUG and CONFIG_PM_SLEEP are set, but the code implementing it doesn't depend on CONFIG_PM_SLEEP. As a result, a build warning appears if CONFIG_PM_ADVANCED_DEBUG is set and CONFIG_PM_SLEEP is not set. Fix it by adding a #ifdef CONFIG_PM_SLEEP around the code in question. Signed-off-by: Rafael J. Wysocki

PM / Sleep: Add "prevent autosleep time" statistics to wakeup sources

2012-05-01T19:25:49+00:00

Android uses one wakelock statistics that is only necessary for opportunistic sleep. Namely, the prevent_suspend_time field accumulates the total time the given wakelock has been locked while "automatic suspend" was enabled. Add an analogous field, prevent_sleep_time, to wakeup sources and make it behave in a similar way. Signed-off-by: Rafael J. Wysocki Acked-by: Greg Kroah-Hartman

PM / Sleep: Change wakeup source statistics to follow Android

2012-05-01T19:25:11+00:00

Wakeup statistics used by Android are slightly different from what we have in wakeup sources at the moment and there aren't any known users of those statistics other than Android, so modify them to make it easier for Android to switch to wakeup sources. This removes the struct wakeup_source's hit_cout field, which is very rough and therefore not very useful, and adds two new fields, wakeup_count and expire_count. The first one tracks how many times the wakeup source is activated with events_check_enabled set (which roughly corresponds to the situations when a system power transition to a sleep state is in progress and would be aborted by this wakeup source if it were the only active one at that time) and the second one is the number of times the wakeup source has been activated with a timeout that expired. Additionally, the last_time field is now updated when the wakeup source is deactivated too (previously it was only updated during the wakeup source's activation), which seems to be what Android does with the analogous counter for wakelocks. Signed-off-by: Rafael J. Wysocki Acked-by: Greg Kroah-Hartman

PM / QoS: Make it possible to expose PM QoS latency constraints

2012-03-13T21:37:14+00:00

A runtime suspend of a device (e.g. an MMC controller) belonging to a power domain or, in a more complicated scenario, a runtime suspend of another device in the same power domain, may cause power to be removed from the entire domain. In that case, the amount of time necessary to runtime-resume the given device (e.g. the MMC controller) is often substantially greater than the time needed to run its driver's runtime resume callback. That may hurt performance in some situations, because user data may need to wait for the device to become operational, so we should make it possible to prevent that from happening. For this reason, introduce a new sysfs attribute for devices, power/pm_qos_resume_latency_us, allowing user space to specify the upper bound of the time necessary to bring the (runtime-suspended) device up after the resume of it has been requested. However, make that attribute appear only for the devices whose drivers declare support for it by calling the (new) dev_pm_qos_expose_latency_limit() helper function with the appropriate initial value of the attribute. Signed-off-by: Rafael J. Wysocki Reviewed-by: Kevin Hilman Reviewed-by: Mark Brown Acked-by: Linus Walleij

drivers/base: Add export.h for EXPORT_SYMBOL/THIS_MODULE as required.

2011-10-31T23:31:38+00:00

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 ] Signed-off-by: Paul Gortmaker

atomic: use

2011-07-26T23:49:47+00:00

This allows us to move duplicated code in (atomic_inc_not_zero() for now) to Signed-off-by: Arun Sharma Reviewed-by: Eric Dumazet Cc: Ingo Molnar Cc: David Miller Cc: Eric Dumazet Acked-by: Mike Frysinger Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

PM / Runtime: Prevent runtime_resume from racing with probe

2011-07-06T08:52:23+00:00

This patch (as1475) adds device_lock() and device_unlock() calls to the store methods for the power/control and power/autosuspend_delay_ms sysfs attribute files. We don't want badly timed writes to these files to cause runtime_resume callbacks to occur while a driver is being probed for a device. Signed-off-by: Alan Stern Signed-off-by: Rafael J. Wysocki

PM / Wakeup: Fix build warning related to the "wakeup" sysfs file

2011-05-17T21:19:18+00:00

The "wakeup" device sysfs file is only created if CONFIG_PM_SLEEP is set, so put it under CONFIG_PM_SLEEP and make a build warning related to it go away. Signed-off-by: Rafael J. Wysocki Acked-by: Greg Kroah-Hartman

PM: Do not create wakeup sysfs files for devices that cannot wake up

2011-03-14T23:43:14+00:00

Currently, wakeup sysfs attributes are created for all devices, regardless of whether or not they are wakeup-capable. This is excessive and complicates wakeup device identification from user space (i.e. to identify wakeup-capable devices user space has to read /sys/devices/.../power/wakeup for all devices and see if they are not empty). Fix this issue by avoiding to create wakeup sysfs files for devices that cannot wake up the system from sleep states (i.e. whose power.can_wakeup flags are unset during registration) and modify device_set_wakeup_capable() so that it adds (or removes) the relevant sysfs attributes if a device's wakeup capability status is changed. Signed-off-by: Rafael J. Wysocki

PM / Runtime: Implement autosuspend support

2010-10-16T23:57:48+00:00

This patch (as1427) implements the "autosuspend" facility for runtime PM. A few new fields are added to the dev_pm_info structure and several new PM helper functions are defined, for telling the PM core whether or not a device uses autosuspend, for setting the autosuspend delay, and for marking periods of device activity. Drivers that do not want to use autosuspend can continue using the same helper functions as before; their behavior will not change. In addition, drivers supporting autosuspend can also call the old helper functions to get the old behavior. The details are all explained in Documentation/power/runtime_pm.txt and Documentation/ABI/testing/sysfs-devices-power. Signed-off-by: Alan Stern Signed-off-by: Rafael J. Wysocki