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V4L/DVB (12512): ov772x: implement a band-stop filter support

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The V4L2_CID_BAND_STOP_FILTER control is used to switch the "Banding Filter" on
OV772x cameras on and off and to set the minimum AEC value in BDBASE register.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Guennadi Liakhovetski 2009-08-25 11:44:14 -03:00 committed by Mauro Carvalho Chehab
parent 3418f165cc
commit a813d01f82
1 changed files with 50 additions and 2 deletions
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52
drivers/media/video/ov772x.c
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@ -403,8 +403,9 @@ struct ov772x_priv {
const struct ov772x_color_format *fmt;
const struct ov772x_win_size *win;
int model;
unsigned int flag_vflip:1;
unsigned int flag_hflip:1;
unsigned short flag_vflip:1;
unsigned short flag_hflip:1;
unsigned short band_filter; /* 256 - BDBASE, 0 if (!COM8[5]) */
};
#define ENDMARKER { 0xff, 0xff }
@ -569,6 +570,15 @@ static const struct v4l2_queryctrl ov772x_controls[] = {
.step = 1,
.default_value = 0,
},
{
.id = V4L2_CID_BAND_STOP_FILTER,
.type = V4L2_CTRL_TYPE_INTEGER,
.name = "Band-stop filter",
.minimum = 0,
.maximum = 256,
.step = 1,
.default_value = 0,
},
};
@ -674,6 +684,9 @@ static int ov772x_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
case V4L2_CID_HFLIP:
ctrl->value = priv->flag_hflip;
break;
case V4L2_CID_BAND_STOP_FILTER:
ctrl->value = priv->band_filter;
break;
}
return 0;
}
@ -700,6 +713,29 @@ static int ov772x_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
val ^= HFLIP_IMG;
ret = ov772x_mask_set(client, COM3, HFLIP_IMG, val);
break;
case V4L2_CID_BAND_STOP_FILTER:
if ((unsigned)ctrl->value > 256)
ctrl->value = 256;
if (ctrl->value == priv->band_filter)
break;
if (!ctrl->value) {
/* Switch the filter off, it is on now */
ret = ov772x_mask_set(client, BDBASE, 0xff, 0xff);
if (!ret)
ret = ov772x_mask_set(client, COM8,
BNDF_ON_OFF, 0);
} else {
/* Switch the filter on, set AEC low limit */
val = 256 - ctrl->value;
ret = ov772x_mask_set(client, COM8,
BNDF_ON_OFF, BNDF_ON_OFF);
if (!ret)
ret = ov772x_mask_set(client, BDBASE,
0xff, val);
}
if (!ret)
priv->band_filter = ctrl->value;
break;
}
return ret;
@ -893,6 +929,18 @@ static int ov772x_set_params(struct i2c_client *client,
if (ret < 0)
goto ov772x_set_fmt_error;
/*
* set COM8
*/
if (priv->band_filter) {
ret = ov772x_mask_set(client, COM8, BNDF_ON_OFF, 1);
if (!ret)
ret = ov772x_mask_set(client, BDBASE,
0xff, 256 - priv->band_filter);
if (ret < 0)
goto ov772x_set_fmt_error;
}
return ret;
ov772x_set_fmt_error: