[media] cx231xx: Provide signal lock status in G_INPUT

Make use of the signal state registers to properly populate the signal lock
registers in the cx231xx driver.

This allows applications to know whether there is a signal present even in
devices which lack a tuner (since such apps typically won't call G_TUNER if
no tuner is present).

[mchehab@redhat.com: Fix CodingStyle: don't use {} for one-line if's]
Signed-off-by: Devin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 14 insertions, 1 deletions

diff --git a/drivers/media/video/cx231xx/cx231xx-video.c b/drivers/media/video/cx231xx/cx231xx-video.c
index 21fa54762be7..6e81f970dc7d 100644
--- a/drivers/media/video/cx231xx/cx231xx-video.c
+++ b/drivers/media/video/cx231xx/cx231xx-video.c
@@ -1179,7 +1179,8 @@ static int vidioc_enum_input(struct file *file, void *priv,
 {
         struct cx231xx_fh *fh = priv;
         struct cx231xx *dev = fh->dev;
-        unsigned int n;
+        u32 gen_stat;
+        unsigned int ret, n;
 
         n = i->index;
         if (n >= MAX_CX231XX_INPUT)
@@ -1198,6 +1199,18 @@ static int vidioc_enum_input(struct file *file, void *priv,
 
         i->std = dev->vdev->tvnorms;
 
+        /* If they are asking about the active input, read signal status */
+        if (n == dev->video_input) {
+                ret = cx231xx_read_i2c_data(dev, VID_BLK_I2C_ADDRESS,
+                                            GEN_STAT, 2, &gen_stat, 4);
+                if (ret > 0) {
+                        if ((gen_stat & FLD_VPRES) == 0x00)
+                                i->status |= V4L2_IN_ST_NO_SIGNAL;
+                        if ((gen_stat & FLD_HLOCK) == 0x00)
+                                i->status |= V4L2_IN_ST_NO_H_LOCK;
+                }
+        }
+
         return 0;
 }