[PATCH v2 1/2] media: video-i2c: check if chip struct has set_power function

[Matt Ranostay]

Not all future supported video chips will always have power management
support, and so it is important to check before calling set_power() is
defined.

Signed-off-by: Matt Ranostay <matt.ranos...@konsulko.com>
---
 drivers/media/i2c/video-i2c.c | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

diff --git a/drivers/media/i2c/video-i2c.c b/drivers/media/i2c/video-i2c.c
index 981166010c9b..a64e1a725a20 100644
--- a/drivers/media/i2c/video-i2c.c
+++ b/drivers/media/i2c/video-i2c.c
@@ -736,9 +736,11 @@ static int video_i2c_probe(struct i2c_client *client,
        video_set_drvdata(&data->vdev, data);
        i2c_set_clientdata(client, data);
 
-       ret = data->chip->set_power(data, true);
-       if (ret)
-               goto error_unregister_device;
+       if (data->chip->set_power) {
+               ret = data->chip->set_power(data, true);
+               if (ret)
+                       goto error_unregister_device;
+       }
 
        pm_runtime_get_noresume(&client->dev);
        pm_runtime_set_active(&client->dev);
@@ -767,7 +769,8 @@ static int video_i2c_probe(struct i2c_client *client,
        pm_runtime_disable(&client->dev);
        pm_runtime_set_suspended(&client->dev);
        pm_runtime_put_noidle(&client->dev);
-       data->chip->set_power(data, false);
+       if (data->chip->set_power)
+               data->chip->set_power(data, false);
 
 error_unregister_device:
        v4l2_device_unregister(v4l2_dev);
@@ -791,7 +794,9 @@ static int video_i2c_remove(struct i2c_client *client)
        pm_runtime_disable(&client->dev);
        pm_runtime_set_suspended(&client->dev);
        pm_runtime_put_noidle(&client->dev);
-       data->chip->set_power(data, false);
+
+       if (data->chip->set_power)
+               data->chip->set_power(data, false);
 
        video_unregister_device(&data->vdev);
 
@@ -804,6 +809,9 @@ static int video_i2c_pm_runtime_suspend(struct device *dev)
 {
        struct video_i2c_data *data = i2c_get_clientdata(to_i2c_client(dev));
 
+       if (!data->chip->set_power)
+               return 0;
+
        return data->chip->set_power(data, false);
 }
 
@@ -811,6 +819,9 @@ static int video_i2c_pm_runtime_resume(struct device *dev)
 {
        struct video_i2c_data *data = i2c_get_clientdata(to_i2c_client(dev));
 
+       if (!data->chip->set_power)
+               return 0;
+
        return data->chip->set_power(data, true);
 }
 
-- 
2.17.1