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PM: add kconfig option for deprecated .../power/state files 

Add a new PM_SYSFS_DEPRECATED config option to control whether or
not the /sys/devices/.../power/state files are provided.  This will
make it easier to get rid of that mechanism when the time comes,
and to verify that userspace tools work right without it.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Acked-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
David Brownell 2006-08-30 13:54:36 -07:00 committed by Greg Kroah-Hartman
parent 047bda3615
commit 2bca293e56
2 changed files with 17 additions and 0 deletions
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6
drivers/base/power/sysfs.c
View File

@ -7,6 +7,8 @@
#include "power.h" #include "power.h"
#ifdef CONFIG_PM_SYSFS_DEPRECATED
/** /**
* state - Control current power state of device * state - Control current power state of device
* *
@ -66,6 +68,8 @@ static ssize_t state_store(struct device * dev, struct device_attribute *attr, c
static DEVICE_ATTR(state, 0644, state_show, state_store); static DEVICE_ATTR(state, 0644, state_show, state_store);
#endif /* CONFIG_PM_SYSFS_DEPRECATED */
/* /*
* wakeup - Report/change current wakeup option for device * wakeup - Report/change current wakeup option for device
* *
@ -139,7 +143,9 @@ static DEVICE_ATTR(wakeup, 0644, wake_show, wake_store);
static struct attribute * power_attrs[] = { static struct attribute * power_attrs[] = {
#ifdef CONFIG_PM_SYSFS_DEPRECATED
&dev_attr_state.attr, &dev_attr_state.attr,
#endif
&dev_attr_wakeup.attr, &dev_attr_wakeup.attr,
NULL, NULL,
}; };

11
kernel/power/Kconfig
View File

@ -53,6 +53,17 @@ config PM_TRACE
CAUTION: this option will cause your machine's real-time clock to be CAUTION: this option will cause your machine's real-time clock to be
set to an invalid time after a resume. set to an invalid time after a resume.
config PM_SYSFS_DEPRECATED
bool "Driver model /sys/devices/.../power/state files (DEPRECATED)"
depends on PM && SYSFS
default n
help
The driver model started out with a sysfs file intended to provide
a userspace hook for device power management. This feature has never
worked very well, except for limited testing purposes, and so it will
be removed. It's not clear that a generic mechanism could really
handle the wide variability of device power states; any replacements
are likely to be bus or driver specific.
config SOFTWARE_SUSPEND config SOFTWARE_SUSPEND
bool "Software Suspend" bool "Software Suspend"