of/platform: Implement support for dev_pm_ops

Linux power management subsystem supports vast amount of new PM
callbacks that are crucial for proper suspend and hibernation support
in drivers.

This patch implements support for dev_pm_ops, preserving support
for legacy callbacks.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 290 insertions, 15 deletions

diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index 298de0f95d70..d58ade170c4b 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c
@@ -65,47 +65,322 @@ static int of_platform_device_remove(struct device *dev)
         return 0;
 }
 
-static int of_platform_device_suspend(struct device *dev, pm_message_t state)
+static void of_platform_device_shutdown(struct device *dev)
 {
         struct of_device *of_dev = to_of_device(dev);
         struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
-        int error = 0;
 
-        if (dev->driver && drv->suspend)
-                error = drv->suspend(of_dev, state);
-        return error;
+        if (dev->driver && drv->shutdown)
+                drv->shutdown(of_dev);
 }
 
-static int of_platform_device_resume(struct device * dev)
+#ifdef CONFIG_PM_SLEEP
+
+static int of_platform_legacy_suspend(struct device *dev, pm_message_t mesg)
 {
         struct of_device *of_dev = to_of_device(dev);
         struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
-        int error = 0;
+        int ret = 0;
 
-        if (dev->driver && drv->resume)
-                error = drv->resume(of_dev);
-        return error;
+        if (dev->driver && drv->suspend)
+                ret = drv->suspend(of_dev, mesg);
+        return ret;
 }
 
-static void of_platform_device_shutdown(struct device *dev)
+static int of_platform_legacy_resume(struct device *dev)
 {
         struct of_device *of_dev = to_of_device(dev);
         struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
+        int ret = 0;
 
-        if (dev->driver && drv->shutdown)
-                drv->shutdown(of_dev);
+        if (dev->driver && drv->resume)
+                ret = drv->resume(of_dev);
+        return ret;
+}
+
+static int of_platform_pm_prepare(struct device *dev)
+{
+        struct device_driver *drv = dev->driver;
+        int ret = 0;
+
+        if (drv && drv->pm && drv->pm->prepare)
+                ret = drv->pm->prepare(dev);
+
+        return ret;
+}
+
+static void of_platform_pm_complete(struct device *dev)
+{
+        struct device_driver *drv = dev->driver;
+
+        if (drv && drv->pm && drv->pm->complete)
+                drv->pm->complete(dev);
+}
+
+#ifdef CONFIG_SUSPEND
+
+static int of_platform_pm_suspend(struct device *dev)
+{
+        struct device_driver *drv = dev->driver;
+        int ret = 0;
+
+        if (!drv)
+                return 0;
+
+        if (drv->pm) {
+                if (drv->pm->suspend)
+                        ret = drv->pm->suspend(dev);
+        } else {
+                ret = of_platform_legacy_suspend(dev, PMSG_SUSPEND);
+        }
+
+        return ret;
 }
 
+static int of_platform_pm_suspend_noirq(struct device *dev)
+{
+        struct device_driver *drv = dev->driver;
+        int ret = 0;
+
+        if (!drv)
+                return 0;
+
+        if (drv->pm) {
+                if (drv->pm->suspend_noirq)
+                        ret = drv->pm->suspend_noirq(dev);
+        }
+
+        return ret;
+}
+
+static int of_platform_pm_resume(struct device *dev)
+{
+        struct device_driver *drv = dev->driver;
+        int ret = 0;
+
+        if (!drv)
+                return 0;
+
+        if (drv->pm) {
+                if (drv->pm->resume)
+                        ret = drv->pm->resume(dev);
+        } else {
+                ret = of_platform_legacy_resume(dev);
+        }
+
+        return ret;
+}
+
+static int of_platform_pm_resume_noirq(struct device *dev)
+{
+        struct device_driver *drv = dev->driver;
+        int ret = 0;
+
+        if (!drv)
+                return 0;
+
+        if (drv->pm) {
+                if (drv->pm->resume_noirq)
+                        ret = drv->pm->resume_noirq(dev);
+        }
+
+        return ret;
+}
+
+#else /* !CONFIG_SUSPEND */
+
+#define of_platform_pm_suspend          NULL
+#define of_platform_pm_resume           NULL
+#define of_platform_pm_suspend_noirq    NULL
+#define of_platform_pm_resume_noirq     NULL
+
+#endif /* !CONFIG_SUSPEND */
+
+#ifdef CONFIG_HIBERNATION
+
+static int of_platform_pm_freeze(struct device *dev)
+{
+        struct device_driver *drv = dev->driver;
+        int ret = 0;
+
+        if (!drv)
+                return 0;
+
+        if (drv->pm) {
+                if (drv->pm->freeze)
+                        ret = drv->pm->freeze(dev);
+        } else {
+                ret = of_platform_legacy_suspend(dev, PMSG_FREEZE);
+        }
+
+        return ret;
+}
+
+static int of_platform_pm_freeze_noirq(struct device *dev)
+{
+        struct device_driver *drv = dev->driver;
+        int ret = 0;
+
+        if (!drv)
+                return 0;
+
+        if (drv->pm) {
+                if (drv->pm->freeze_noirq)
+                        ret = drv->pm->freeze_noirq(dev);
+        }
+
+        return ret;
+}
+
+static int of_platform_pm_thaw(struct device *dev)
+{
+        struct device_driver *drv = dev->driver;
+        int ret = 0;
+
+        if (!drv)
+                return 0;
+
+        if (drv->pm) {
+                if (drv->pm->thaw)
+                        ret = drv->pm->thaw(dev);
+        } else {
+                ret = of_platform_legacy_resume(dev);
+        }
+
+        return ret;
+}
+
+static int of_platform_pm_thaw_noirq(struct device *dev)
+{
+        struct device_driver *drv = dev->driver;
+        int ret = 0;
+
+        if (!drv)
+                return 0;
+
+        if (drv->pm) {
+                if (drv->pm->thaw_noirq)
+                        ret = drv->pm->thaw_noirq(dev);
+        }
+
+        return ret;
+}
+
+static int of_platform_pm_poweroff(struct device *dev)
+{
+        struct device_driver *drv = dev->driver;
+        int ret = 0;
+
+        if (!drv)
+                return 0;
+
+        if (drv->pm) {
+                if (drv->pm->poweroff)
+                        ret = drv->pm->poweroff(dev);
+        } else {
+                ret = of_platform_legacy_suspend(dev, PMSG_HIBERNATE);
+        }
+
+        return ret;
+}
+
+static int of_platform_pm_poweroff_noirq(struct device *dev)
+{
+        struct device_driver *drv = dev->driver;
+        int ret = 0;
+
+        if (!drv)
+                return 0;
+
+        if (drv->pm) {
+                if (drv->pm->poweroff_noirq)
+                        ret = drv->pm->poweroff_noirq(dev);
+        }
+
+        return ret;
+}
+
+static int of_platform_pm_restore(struct device *dev)
+{
+        struct device_driver *drv = dev->driver;
+        int ret = 0;
+
+        if (!drv)
+                return 0;
+
+        if (drv->pm) {
+                if (drv->pm->restore)
+                        ret = drv->pm->restore(dev);
+        } else {
+                ret = of_platform_legacy_resume(dev);
+        }
+
+        return ret;
+}
+
+static int of_platform_pm_restore_noirq(struct device *dev)
+{
+        struct device_driver *drv = dev->driver;
+        int ret = 0;
+
+        if (!drv)
+                return 0;
+
+        if (drv->pm) {
+                if (drv->pm->restore_noirq)
+                        ret = drv->pm->restore_noirq(dev);
+        }
+
+        return ret;
+}
+
+#else /* !CONFIG_HIBERNATION */
+
+#define of_platform_pm_freeze           NULL
+#define of_platform_pm_thaw             NULL
+#define of_platform_pm_poweroff         NULL
+#define of_platform_pm_restore          NULL
+#define of_platform_pm_freeze_noirq     NULL
+#define of_platform_pm_thaw_noirq               NULL
+#define of_platform_pm_poweroff_noirq   NULL
+#define of_platform_pm_restore_noirq    NULL
+
+#endif /* !CONFIG_HIBERNATION */
+
+static struct dev_pm_ops of_platform_dev_pm_ops = {
+        .prepare = of_platform_pm_prepare,
+        .complete = of_platform_pm_complete,
+        .suspend = of_platform_pm_suspend,
+        .resume = of_platform_pm_resume,
+        .freeze = of_platform_pm_freeze,
+        .thaw = of_platform_pm_thaw,
+        .poweroff = of_platform_pm_poweroff,
+        .restore = of_platform_pm_restore,
+        .suspend_noirq = of_platform_pm_suspend_noirq,
+        .resume_noirq = of_platform_pm_resume_noirq,
+        .freeze_noirq = of_platform_pm_freeze_noirq,
+        .thaw_noirq = of_platform_pm_thaw_noirq,
+        .poweroff_noirq = of_platform_pm_poweroff_noirq,
+        .restore_noirq = of_platform_pm_restore_noirq,
+};
+
+#define OF_PLATFORM_PM_OPS_PTR  (&of_platform_dev_pm_ops)
+
+#else /* !CONFIG_PM_SLEEP */
+
+#define OF_PLATFORM_PM_OPS_PTR  NULL
+
+#endif /* !CONFIG_PM_SLEEP */
+
 int of_bus_type_init(struct bus_type *bus, const char *name)
 {
         bus->name = name;
         bus->match = of_platform_bus_match;
         bus->probe = of_platform_device_probe;
         bus->remove = of_platform_device_remove;
-        bus->suspend = of_platform_device_suspend;
-        bus->resume = of_platform_device_resume;
         bus->shutdown = of_platform_device_shutdown;
         bus->dev_attrs = of_platform_device_attrs;
+        bus->pm = OF_PLATFORM_PM_OPS_PTR;
         return bus_register(bus);
 }