V4L/DVB (13069): radio-mr800: ensure the radio is initialized to a consistent state

Ensure the radio is initialized to a consistent state.

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, 32 insertions, 2 deletions

diff --git a/drivers/media/radio/radio-mr800.c b/drivers/media/radio/radio-mr800.c
index 399032e8cc1..7db992d3b0d 100644
--- a/drivers/media/radio/radio-mr800.c
+++ b/drivers/media/radio/radio-mr800.c
@@ -85,6 +85,9 @@ MODULE_LICENSE("GPL");
 #define amradio_dev_warn(dev, fmt, arg...)                              \
                 dev_warn(dev, MR800_DRIVER_NAME " - " fmt, ##arg)
 
+#define amradio_dev_err(dev, fmt, arg...) \
+                dev_err(dev, MR800_DRIVER_NAME " - " fmt, ##arg)
+
 /* Probably USB_TIMEOUT should be modified in module parameter */
 #define BUFFER_LENGTH 8
 #define USB_TIMEOUT 500
@@ -137,6 +140,7 @@ struct amradio_device {
         int curfreq;
         int stereo;
         int muted;
+        int initialized;
 };
 
 #define vdev_to_amradio(r) container_of(r, struct amradio_device, videodev)
@@ -478,6 +482,31 @@ static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
         return 0;
 }
 
+static int usb_amradio_init(struct amradio_device *radio)
+{
+        int retval;
+
+        retval = amradio_set_mute(radio, AMRADIO_STOP);
+        if (retval < 0) {
+                amradio_dev_warn(&radio->videodev.dev, "amradio_stop failed\n");
+                goto out_err;
+        }
+
+        retval = amradio_set_stereo(radio, WANT_STEREO);
+        if (retval < 0) {
+                amradio_dev_warn(&radio->videodev.dev, "set stereo failed\n");
+                goto out_err;
+        }
+
+        radio->initialized = 1;
+        goto out;
+
+out_err:
+        amradio_dev_err(&radio->videodev.dev, "initialization failed\n");
+out:
+        return retval;
+}
+
 /* open device - amradio_start() and amradio_setfreq() */
 static int usb_amradio_open(struct file *file)
 {
@@ -493,6 +522,9 @@ static int usb_amradio_open(struct file *file)
 
         file->private_data = radio;
 
+        if (unlikely(!radio->initialized))
+                retval = usb_amradio_init(radio);
+
 unlock:
         mutex_unlock(&radio->lock);
         return retval;
@@ -641,8 +673,6 @@ static int usb_amradio_probe(struct usb_interface *intf,
 
         radio->usbdev = interface_to_usbdev(intf);
         radio->curfreq = 95.16 * FREQ_MUL;
-        radio->stereo = -1;
-        radio->muted = 1;
 
         mutex_init(&radio->lock);