Merge branch 'i2c-for-linus' of git://git.kernel.org/pub/scm/linux/ke…

…rnel/git/jdelvare/staging

* 'i2c-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging:
  i2c: Encourage move to dev_pm_ops by warning on use of legacy methods
  i2c: Factor out runtime suspend checks from PM operations
  i2c: Unregister dummy devices last on adapter removal

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
@@ -1019,6 +991,14 @@ static int i2c_do_del_adapter(struct i2c_driver *driver,
 }
 
 static int __unregister_client(struct device *dev, void *dummy)
+{
+	struct i2c_client *client = i2c_verify_client(dev);
+	if (client && strcmp(client->name, "dummy"))
+		i2c_unregister_device(client);
+	return 0;
+}
+
+static int __unregister_dummy(struct device *dev, void *dummy)
 {
 	struct i2c_client *client = i2c_verify_client(dev);
 	if (client)
@@ -1075,8 +1055,12 @@ int i2c_del_adapter(struct i2c_adapter *adap)
 	mutex_unlock(&adap->userspace_clients_lock);
 
 	/* Detach any active clients. This can't fail, thus we do not
-	   checking the returned value. */
+	 * check the returned value. This is a two-pass process, because
+	 * we can't remove the dummy devices during the first pass: they
+	 * could have been instantiated by real devices wishing to clean
+	 * them up properly, so we give them a chance to do that first. */
 	res = device_for_each_child(&adap->dev, NULL, __unregister_client);
+	res = device_for_each_child(&adap->dev, NULL, __unregister_dummy);
 
 #ifdef CONFIG_I2C_COMPAT
 	class_compat_remove_link(i2c_adapter_compat_class, &adap->dev,
@@ -1140,6 +1124,14 @@ int i2c_register_driver(struct module *owner, struct i2c_driver *driver)
 	if (res)
 		return res;
 
+	/* Drivers should switch to dev_pm_ops instead. */
+	if (driver->suspend)
+		pr_warn("i2c-core: driver [%s] using legacy suspend method\n",
+			driver->driver.name);
+	if (driver->resume)
+		pr_warn("i2c-core: driver [%s] using legacy resume method\n",
+			driver->driver.name);
+
 	pr_debug("i2c-core: driver [%s] registered\n", driver->driver.name);
 
 	INIT_LIST_HEAD(&driver->clients);