linux-kernel - [linux-pm][PATCH] base: Change power/wakeup output from "" to "unsupported" if wakeup feature isn't supported by a device

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Message-Id: <1199441414.19185.9.camel@yangyi-dev.bj.intel.com>
Date:	Fri, 04 Jan 2008 18:10:14 +0800
From:	Yi Yang <yi.y.yang@...el.com>
To:	pavel@....cz, linux-pm@...ts.linux-foundation.org
Cc:	linux-kernel@...r.kernel.org
Subject: [linux-pm][PATCH] base: Change power/wakeup output from "" to
	"unsupported" if wakeup feature isn't supported by a device

If a device can't support wakeup, its /sys/devices/.../power/wakeup output is
empty, this is confusing, a user doesn't know if it supports wakeup feature
unless he/she read the ralated source code, for this case, it is more
reasonable to output "unsupported". Otherwise, no matter what value the user
sets to /sys/devices/.../power/wakeup, the result is the same:  Invalid argument,
so the user doesn't know why.

This patch changes empty output to "unsupported" in order that a user knows
wakeup feature isn't supported by this device when he/she
'cat /sys/devices/.../power/wakeup', please consider to apply, thanks.

Signed-off-by: Yi Yang <yi.y.yang@...el.com>
---
 sysfs.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/base/power/sysfs.c	2008-01-04 16:50:54.000000000 +0800
+++ b/drivers/base/power/sysfs.c	2008-01-04 17:14:42.000000000 +0800
@@ -49,7 +49,7 @@ wake_show(struct device * dev, struct de
 {
 	return sprintf(buf, "%s\n", device_can_wakeup(dev)
 		? (device_may_wakeup(dev) ? enabled : disabled)
-		: "");
+		: "unsupported");
 }

 static ssize_t

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