i2c: Factor out runtime suspend checks from PM operations

When devices use dev_pm_ops the I2C API is implementing standard functionality
for integration with runtime PM and for checking for the presence of a per
device op. The PM core provides pm_generic_ functions implementing this
behaviour - use them to reduce coupling with future PM updates.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index b916675605b446401f5fbbb9b6569bbd4a84c019..0f9dc7dc15f16dbfb2c976b4939b401056eee0a2 100644 (file)
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -196,88 +196,60 @@ static int i2c_device_pm_suspend(struct device *dev)
 {
        const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 
-       if (pm) {
-               if (pm_runtime_suspended(dev))
-                       return 0;
-               else
-                       return pm->suspend ? pm->suspend(dev) : 0;
-       }
-
-       return i2c_legacy_suspend(dev, PMSG_SUSPEND);
+       if (pm)
+               return pm_generic_suspend(dev);
+       else
+               return i2c_legacy_suspend(dev, PMSG_SUSPEND);
 }
 
 static int i2c_device_pm_resume(struct device *dev)
 {
        const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
-       int ret;
 
        if (pm)
-               ret = pm->resume ? pm->resume(dev) : 0;
+               return pm_generic_resume(dev);
        else
-               ret = i2c_legacy_resume(dev);
-
-       return ret;
+               return i2c_legacy_resume(dev);
 }
 
 static int i2c_device_pm_freeze(struct device *dev)
 {
        const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 
-       if (pm) {
-               if (pm_runtime_suspended(dev))
-                       return 0;
-               else
-                       return pm->freeze ? pm->freeze(dev) : 0;
-       }
-
-       return i2c_legacy_suspend(dev, PMSG_FREEZE);
+       if (pm)
+               return pm_generic_freeze(dev);
+       else
+               return i2c_legacy_suspend(dev, PMSG_FREEZE);
 }
 
 static int i2c_device_pm_thaw(struct device *dev)
 {
        const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 
-       if (pm) {
-               if (pm_runtime_suspended(dev))
-                       return 0;
-               else
-                       return pm->thaw ? pm->thaw(dev) : 0;
-       }
-
-       return i2c_legacy_resume(dev);
+       if (pm)
+               return pm_generic_thaw(dev);
+       else
+               return i2c_legacy_resume(dev);
 }
 
 static int i2c_device_pm_poweroff(struct device *dev)
 {
        const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 
-       if (pm) {
-               if (pm_runtime_suspended(dev))
-                       return 0;
-               else
-                       return pm->poweroff ? pm->poweroff(dev) : 0;
-       }
-
-       return i2c_legacy_suspend(dev, PMSG_HIBERNATE);
+       if (pm)
+               return pm_generic_poweroff(dev);
+       else
+               return i2c_legacy_suspend(dev, PMSG_HIBERNATE);
 }
 
 static int i2c_device_pm_restore(struct device *dev)
 {
        const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
-       int ret;
 
        if (pm)
-               ret = pm->restore ? pm->restore(dev) : 0;
+               return pm_generic_restore(dev);
        else
-               ret = i2c_legacy_resume(dev);
-
-       if (!ret) {
-               pm_runtime_disable(dev);
-               pm_runtime_set_active(dev);
-               pm_runtime_enable(dev);
-       }
-
-       return ret;
+               return i2c_legacy_resume(dev);
 }
 #else /* !CONFIG_PM_SLEEP */
 #define i2c_device_pm_suspend  NULL