V4L/DVB (13071): radio-mr800: preserve radio state during suspend/resume

Preserve radio state during suspend/resume.

Signed-off-by: David Ellingsworth <david@identd.dyndns.org>
Acked-by: Alexey Klimov <klimov.linux@gmail.com>
Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 28 insertions, 5 deletions

diff --git a/drivers/media/radio/radio-mr800.c b/drivers/media/radio/radio-mr800.c
index 9764eca2c498..ac2107378942 100644
--- a/drivers/media/radio/radio-mr800.c
+++ b/drivers/media/radio/radio-mr800.c
@@ -574,9 +574,12 @@ static int usb_amradio_suspend(struct usb_interface *intf, pm_message_t message)
 
         mutex_lock(&radio->lock);
 
-        retval = amradio_set_mute(radio, AMRADIO_STOP);
-        if (retval < 0)
-                dev_warn(&intf->dev, "amradio_stop failed\n");
+        if (!radio->muted && radio->initialized) {
+                retval = amradio_set_mute(radio, AMRADIO_STOP);
+                if (retval < 0)
+                        dev_warn(&intf->dev, "amradio_stop failed\n");
+                radio->muted = 0;
+        }
 
         dev_info(&intf->dev, "going into suspend..\n");
 
@@ -592,10 +595,30 @@ static int usb_amradio_resume(struct usb_interface *intf)
 
         mutex_lock(&radio->lock);
 
-        retval = amradio_set_mute(radio, AMRADIO_START);
+        if (unlikely(!radio->initialized))
+                goto unlock;
+
+        if (radio->stereo)
+                retval = amradio_set_stereo(radio, WANT_STEREO);
+        else
+                retval = amradio_set_stereo(radio, WANT_MONO);
+
         if (retval < 0)
-                dev_warn(&intf->dev, "amradio_start failed\n");
+                amradio_dev_warn(&radio->videodev.dev, "set stereo failed\n");
 
+        retval = amradio_setfreq(radio, radio->curfreq);
+        if (retval < 0)
+                amradio_dev_warn(&radio->videodev.dev,
+                        "set frequency failed\n");
+
+        if (!radio->muted) {
+                retval = amradio_set_mute(radio, AMRADIO_START);
+                if (retval < 0)
+                        dev_warn(&radio->videodev.dev,
+                                "amradio_start failed\n");
+        }
+
+unlock:
         dev_info(&intf->dev, "coming out of suspend..\n");
 
         mutex_unlock(&radio->lock);