V4L/DVB (13402): radio-mr800 - autosuspend for radio-mr800 driver

Patch adds autosuspend support for mr800 radio driver.

Signed-off-by: Oliver Neukum <oliver@neukum.org>
Acked-by: Alexey Klimov <klimov.linux@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/radio/radio-mr800.c b/drivers/media/radio/radio-mr800.c
index 4064109c4205cfb079f6590f0b3664a2cf2c3318..44efa68d9f8e60a890687bb584253faf6987ed90 100644 (file)
--- a/drivers/media/radio/radio-mr800.c
+++ b/drivers/media/radio/radio-mr800.c
@@ -132,6 +132,7 @@ static int usb_amradio_resume(struct usb_interface *intf);
 struct amradio_device {
        /* reference to USB and video device */
        struct usb_device *usbdev;
+       struct usb_interface *intf;
        struct video_device videodev;
        struct v4l2_device v4l2_dev;
 
@@ -163,7 +164,7 @@ static struct usb_driver usb_amradio_driver = {
        .resume                 = usb_amradio_resume,
        .reset_resume           = usb_amradio_resume,
        .id_table               = usb_amradio_device_table,
-       .supports_autosuspend   = 0,
+       .supports_autosuspend   = 1,
 };
 
 /* switch on/off the radio. Send 8 bytes to device */
@@ -506,9 +507,15 @@ static int usb_amradio_open(struct file *file)
        }
 
        file->private_data = radio;
+       retval = usb_autopm_get_interface(radio->intf);
+       if (retval)
+               goto unlock;
 
-       if (unlikely(!radio->initialized))
+       if (unlikely(!radio->initialized)) {
                retval = usb_amradio_init(radio);
+               if (retval)
+                       usb_autopm_put_interface(radio->intf);
+       }
 
 unlock:
        mutex_unlock(&radio->lock);
@@ -525,6 +532,8 @@ static int usb_amradio_close(struct file *file)
 
        if (!radio->usbdev)
                retval = -EIO;
+       else
+               usb_autopm_put_interface(radio->intf);
 
        mutex_unlock(&radio->lock);
        return retval;
@@ -666,6 +675,7 @@ static int usb_amradio_probe(struct usb_interface *intf,
        radio->videodev.release = usb_amradio_video_device_release;
 
        radio->usbdev = interface_to_usbdev(intf);
+       radio->intf = intf;
        radio->curfreq = 95.16 * FREQ_MUL;
 
        mutex_init(&radio->lock);