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[media] v4l: add new tuner types for SDR 

Define tuner types V4L2_TUNER_ADC and V4L2_TUNER_RF for SDR usage.

ADC is used for setting sampling rate (sampling frequency) to SDR
device.

Another tuner type, named as V4L2_TUNER_RF, is possible RF tuner.
Is is used to down-convert RF frequency to range ADC could sample.
Having RF tuner is optional, whilst in practice it is almost always
there.

Also add checks to VIDIOC_G_FREQUENCY, VIDIOC_S_FREQUENCY and
VIDIOC_ENUM_FREQ_BANDS only allow these two tuner types when device
type is SDR (VFL_TYPE_SDR). For VIDIOC_G_FREQUENCY we do not check
tuner type, instead override type with V4L2_TUNER_ADC in every
case (requested by Hans in order to keep functionality in line with
existing tuners and existing API does not specify it).

Prohibit VIDIOC_S_HW_FREQ_SEEK explicitly when device type is SDR,
as device cannot do hardware seek without a hardware demodulator.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Antti Palosaari 2013-12-11 20:24:02 -03:00 committed by Mauro Carvalho Chehab
parent d42626bda4
commit 84099a282e
2 changed files with 30 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
drivers/media/v4l2-core/v4l2-ioctl.c
View File

@ -1291,8 +1291,11 @@ static int v4l_g_frequency(const struct v4l2_ioctl_ops *ops,
struct video_device *vfd = video_devdata(file);
struct v4l2_frequency *p = arg;
p->type = (vfd->vfl_type == VFL_TYPE_RADIO) ?
V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
if (vfd->vfl_type == VFL_TYPE_SDR)
p->type = V4L2_TUNER_ADC;
else
p->type = (vfd->vfl_type == VFL_TYPE_RADIO) ?
V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
return ops->vidioc_g_frequency(file, fh, p);
}
@ -1303,10 +1306,15 @@ static int v4l_s_frequency(const struct v4l2_ioctl_ops *ops,
const struct v4l2_frequency *p = arg;
enum v4l2_tuner_type type;
type = (vfd->vfl_type == VFL_TYPE_RADIO) ?
V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
if (p->type != type)
return -EINVAL;
if (vfd->vfl_type == VFL_TYPE_SDR) {
if (p->type != V4L2_TUNER_ADC && p->type != V4L2_TUNER_RF)
return -EINVAL;
} else {
type = (vfd->vfl_type == VFL_TYPE_RADIO) ?
V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
if (type != p->type)
return -EINVAL;
}
return ops->vidioc_s_frequency(file, fh, p);
}
@ -1386,6 +1394,10 @@ static int v4l_s_hw_freq_seek(const struct v4l2_ioctl_ops *ops,
struct v4l2_hw_freq_seek *p = arg;
enum v4l2_tuner_type type;
/* s_hw_freq_seek is not supported for SDR for now */
if (vfd->vfl_type == VFL_TYPE_SDR)
return -EINVAL;
type = (vfd->vfl_type == VFL_TYPE_RADIO) ?
V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
if (p->type != type)
@ -1885,11 +1897,16 @@ static int v4l_enum_freq_bands(const struct v4l2_ioctl_ops *ops,
enum v4l2_tuner_type type;
int err;
type = (vfd->vfl_type == VFL_TYPE_RADIO) ?
V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
if (type != p->type)
return -EINVAL;
if (vfd->vfl_type == VFL_TYPE_SDR) {
if (p->type != V4L2_TUNER_ADC && p->type != V4L2_TUNER_RF)
return -EINVAL;
type = p->type;
} else {
type = (vfd->vfl_type == VFL_TYPE_RADIO) ?
V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
if (type != p->type)
return -EINVAL;
}
if (ops->vidioc_enum_freq_bands)
return ops->vidioc_enum_freq_bands(file, fh, p);
if (is_valid_ioctl(vfd, VIDIOC_G_TUNER)) {

2
include/uapi/linux/videodev2.h
View File

@ -159,6 +159,8 @@ enum v4l2_tuner_type {
V4L2_TUNER_RADIO = 1,
V4L2_TUNER_ANALOG_TV = 2,
V4L2_TUNER_DIGITAL_TV = 3,
V4L2_TUNER_ADC = 4,
V4L2_TUNER_RF = 5,
};
enum v4l2_memory {