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[media] cx231xx: Provide signal lock status in G_INPUT

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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>
This commit is contained in:
Devin Heitmueller 2011-07-24 17:07:07 -03:00 committed by Mauro Carvalho Chehab
parent 44ecf1df94
commit de99d5328c
1 changed files with 14 additions and 1 deletions
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15
drivers/media/video/cx231xx/cx231xx-video.c
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@ -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;
}