[PATCH 20/47] PM: add kconfig option for deprecated .../power/state files

From: Greg KH
Date: Tue Sep 26 2006 - 01:51:16 EST

From: David Brownell <david-b@xxxxxxxxxxx>

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@xxxxxxxxxxxxxxxxxxxxx>
Acked-by: Pavel Machek <pavel@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
drivers/base/power/sysfs.c | 6 ++++++
kernel/power/Kconfig | 11 +++++++++++
2 files changed, 17 insertions(+), 0 deletions(-)

diff --git a/drivers/base/power/sysfs.c b/drivers/base/power/sysfs.c
index e55b3c2..2d47517 100644
--- a/drivers/base/power/sysfs.c
+++ b/drivers/base/power/sysfs.c
@@ -7,6 +7,8 @@ #include <linux/string.h>
#include "power.h"

* state - Control current power state of device
@@ -66,6 +68,8 @@ static ssize_t state_store(struct device
static DEVICE_ATTR(state, 0644, state_show, state_store);

* wakeup - Report/change current wakeup option for device
@@ -139,7 +143,9 @@ static DEVICE_ATTR(wakeup, 0644, wake_sh

static struct attribute * power_attrs[] = {
diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index 619ecab..1ed9720 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -53,6 +53,17 @@ config PM_TRACE
CAUTION: this option will cause your machine's real-time clock to be
set to an invalid time after a resume.

+ 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.

bool "Software Suspend"

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