V4L/DVB (4727): Support status readout for saa713x based FM radio

This patch adds readout for stereo and signal level for
saa713x cards which use the saa713x as FM demodulator.
These are many cards based on saa7133, tda8290 and tda8275a.
FM channel search should work now.

Signed-off-by: Hartmut Hackmann <hartmut.hackmann@t-online.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/media/video/saa7134/saa7134-video.c b/drivers/media/video/saa7134/saa7134-video.c
index 203302f21827..830617ea81cc 100644
--- a/drivers/media/video/saa7134/saa7134-video.c
+++ b/drivers/media/video/saa7134/saa7134-video.c
@@ -2248,7 +2248,11 @@ static int radio_do_ioctl(struct inode *inode, struct file *file,
                 t->type = V4L2_TUNER_RADIO;
 
                 saa7134_i2c_call_clients(dev, VIDIOC_G_TUNER, t);
-
+                if (dev->input->amux == TV) {
+                        t->signal = 0xf800 - ((saa_readb(0x581) & 0x1f) << 11);
+                        t->rxsubchans = (saa_readb(0x529) & 0x08) ?
+                                        V4L2_TUNER_SUB_STEREO : V4L2_TUNER_SUB_MONO;
+                }
                 return 0;
         }
         case VIDIOC_S_TUNER: