From f0ced9b229cfbc76b5db9837b4b256b602d56610 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Sun, 6 May 2007 14:50:50 -0700 Subject: [PATCH] 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 Acked-by: "Rafael J. Wysocki" Acked-by: Pavel Machek Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- Documentation/power/interface.txt | 8 ++++++-- kernel/power/disk.c | 29 ++++++++++++++++++++++++++++- 2 files changed, 34 insertions(+), 3 deletions(-) diff --git a/Documentation/power/interface.txt b/Documentation/power/interface.txt index 8c5b41bf3f36..fd5192a8fa8a 100644 --- a/Documentation/power/interface.txt +++ b/Documentation/power/interface.txt @@ -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' diff --git a/kernel/power/disk.c b/kernel/power/disk.c index e518379b667a..06331374d862 100644 --- a/kernel/power/disk.c +++ b/kernel/power/disk.c @@ -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; }