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

* '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

diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index c7db698..f0bd5bc 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
@@ -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);