[MTD] physmap: add power management support

Implement PM handling for physmap.  Idea from Steven Scholz, patch
by David Anders.

Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

1 files changed, 33 insertions, 0 deletions

diff --git a/drivers/mtd/maps/physmap.c b/drivers/mtd/maps/physmap.c
index 7799a25a7f2a..bc7cc71788bc 100644
--- a/drivers/mtd/maps/physmap.c
+++ b/drivers/mtd/maps/physmap.c
@@ -158,9 +158,42 @@ err_out:
         return err;
 }
 
+#ifdef CONFIG_PM
+static int physmap_flash_suspend(struct platform_device *dev, pm_message_t state)
+{
+        struct physmap_flash_info *info = platform_get_drvdata(dev);
+        int ret = 0;
+
+        if (info)
+                ret = info->mtd->suspend(info->mtd);
+
+        return ret;
+}
+
+static int physmap_flash_resume(struct platform_device *dev)
+{
+        struct physmap_flash_info *info = platform_get_drvdata(dev);
+        if (info)
+                info->mtd->resume(info->mtd);
+        return 0;
+}
+
+static void physmap_flash_shutdown(struct platform_device *dev)
+{
+        struct physmap_flash_info *info = platform_get_drvdata(dev);
+        if (info && info->mtd->suspend(info->mtd) == 0)
+                info->mtd->resume(info->mtd);
+}
+#endif
+
 static struct platform_driver physmap_flash_driver = {
         .probe          = physmap_flash_probe,
         .remove         = physmap_flash_remove,
+#ifdef CONFIG_PM
+        .suspend        = physmap_flash_suspend,
+        .resume         = physmap_flash_resume,
+        .shutdown       = physmap_flash_shutdown,
+#endif
         .driver         = {
                 .name   = "physmap-flash",
         },