[PATCH 6/9] power management: fix struct layout and docs

From: Greg Kroah-Hartman
Date: Fri Feb 23 2007 - 18:18:57 EST

From: Johannes Berg <johannes@xxxxxxxxxxxxxxxx>

Because the pm ops in powermac are obviously not using them as intended, I
added documentation for it in kernel-doc format.

Reordering the fields in struct pm_ops not only makes the output of kernel-doc
make more sense but also removes a hole from the structure on 64-bit

Signed-off-by: Johannes Berg <johannes@xxxxxxxxxxxxxxxx>
Cc: "Randy.Dunlap" <rdunlap@xxxxxxxxxxxx>
Cc: Rafael J. Wysocki <rjw@xxxxxxx>
Cc: Pavel Macheck <pavel@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
include/linux/pm.h | 37 +++++++++++++++++++++++++++++++++++--
1 files changed, 35 insertions(+), 2 deletions(-)

diff --git a/include/linux/pm.h b/include/linux/pm.h
index 070394e..21db05a 100644
--- a/include/linux/pm.h
+++ b/include/linux/pm.h
@@ -120,15 +120,48 @@ typedef int __bitwise suspend_disk_method_t;
#define PM_DISK_TESTPROC ((__force suspend_disk_method_t) 6)
#define PM_DISK_MAX ((__force suspend_disk_method_t) 7)

+ * struct pm_ops - Callbacks for managing platform dependent suspend states.
+ * @valid: Callback to determine whether the given state can be entered.
+ * always valid and never passed to this call.
+ * If not assigned, all suspend states are advertised as valid
+ * in /sys/power/state (but can still be rejected by prepare or enter.)
+ *
+ * @prepare: Prepare the platform for the given suspend state. Can return a
+ * negative error code if necessary.
+ *
+ * @enter: Enter the given suspend state, must be assigned. Can return a
+ * negative error code if necessary.
+ *
+ * @finish: Called when the system has left the given state and all devices
+ * are resumed. The return value is ignored.
+ *
+ * @pm_disk_mode: Set to the disk method that the user should be able to
+ * configure for suspend-to-disk. Since %PM_DISK_SHUTDOWN,
+ * are always allowed, currently only %PM_DISK_PLATFORM
+ * makes sense. If the user then choses %PM_DISK_PLATFORM,
+ * the @prepare call will be called before suspending to disk
+ * (if present), the @enter call should be present and will
+ * be called after all state has been saved and the machine
+ * is ready to be shut down/suspended/..., and the @finish
+ * callback is called after state has been restored. All
+ * these calls are called with %PM_SUSPEND_DISK as the state.
+ */
struct pm_ops {
- suspend_disk_method_t pm_disk_mode;
int (*valid)(suspend_state_t state);
int (*prepare)(suspend_state_t state);
int (*enter)(suspend_state_t state);
int (*finish)(suspend_state_t state);
+ suspend_disk_method_t pm_disk_mode;

-extern void pm_set_ops(struct pm_ops *);
+ * pm_set_ops - set platform dependent power management ops
+ * @pm_ops: The new power management operations to set.
+ */
+extern void pm_set_ops(struct pm_ops *pm_ops);
extern struct pm_ops *pm_ops;
extern int pm_suspend(suspend_state_t state);


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