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power management: change /sys/power/disk display 

Change /sys/power/disk to display all valid modes as well as the currently
selected one in a fashion known from the LED subsystem.

This changes userspace API, but it is apparently not used much (we asked
some userspace developers)

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Acked-by: "Rafael J. Wysocki" <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
hifive-unleashed-5.1
Johannes Berg 2007-05-06 14:50:50 -07:00 committed by Linus Torvalds
parent ab3bfca7ab
commit f0ced9b229
2 changed files with 34 additions and 3 deletions
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8
Documentation/power/interface.txt
View File

@ -34,8 +34,12 @@ for 5 seconds, resume devices, unfreeze tasks and enable nonboot CPUs. Then,
we are able to look in the log messages and work out, for example, which code
is being slow and which device drivers are misbehaving.
Reading from this file will display what the mode is currently set
to. Writing to this file will accept one of
Reading from this file will display all supported modes and the currently
selected one in brackets, for example
[shutdown] reboot test testproc
Writing to this file will accept one of
'platform' (only if the platform supports it)
'shutdown'

29
kernel/power/disk.c
View File

@ -350,7 +350,34 @@ static const char * const pm_disk_modes[] = {
static ssize_t disk_show(struct kset *kset, char *buf)
{
return sprintf(buf, "%s\n", pm_disk_modes[pm_disk_mode]);
int i;
char *start = buf;
for (i = PM_DISK_PLATFORM; i < PM_DISK_MAX; i++) {
if (!pm_disk_modes[i])
continue;
switch (i) {
case PM_DISK_SHUTDOWN:
case PM_DISK_REBOOT:
case PM_DISK_TEST:
case PM_DISK_TESTPROC:
break;
default:
if (pm_ops && pm_ops->enter &&
(i == pm_ops->pm_disk_mode))
break;
/* not a valid mode, continue with loop */
continue;
}
if (i == pm_disk_mode)
buf += sprintf(buf, "[%s]", pm_disk_modes[i]);
else
buf += sprintf(buf, "%s", pm_disk_modes[i]);
if (i+1 != PM_DISK_MAX)
buf += sprintf(buf, " ");
}
buf += sprintf(buf, "\n");
return buf-start;
}