viafb: General power management infrastructure

Multiple devices need S/R hooks (framebuffer, GPIO, camera).
Add infrastructure and convert existing framebuffer code to the new
model.

This patch should create no functional change.
Based on earlier work by Jonathan Corbet.

Signed-off-by: Daniel Drake <dsd@laptop.org>
Acked-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

1 files changed, 15 insertions, 0 deletions

diff --git a/include/linux/via-core.h b/include/linux/via-core.h
index 7ffb521e1a7a..a4327a0c8efc 100644
--- a/include/linux/via-core.h
+++ b/include/linux/via-core.h
@@ -60,6 +60,21 @@ struct via_port_cfg {
 };
 
 /*
+ * Allow subdevs to register suspend/resume hooks.
+ */
+#ifdef CONFIG_PM
+struct viafb_pm_hooks {
+        struct list_head list;
+        int (*suspend)(void *private);
+        int (*resume)(void *private);
+        void *private;
+};
+
+void viafb_pm_register(struct viafb_pm_hooks *hooks);
+void viafb_pm_unregister(struct viafb_pm_hooks *hooks);
+#endif /* CONFIG_PM */
+
+/*
  * This is the global viafb "device" containing stuff needed by
  * all subdevs.
  */