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V4L/DVB: ov7670: wire up controls for exposure and autoexposure 

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Jonathan Corbet 2010-03-05 16:48:39 -03:00 committed by Mauro Carvalho Chehab
parent 8189867124
commit 364e93372f
1 changed files with 86 additions and 0 deletions
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86
drivers/media/video/ov7670.c
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@ -1190,6 +1190,79 @@ static int ov7670_s_autogain(struct v4l2_subdev *sd, int value)
return ret;
}
/*
* Exposure is spread all over the place: top 6 bits in AECHH, middle
* 8 in AECH, and two stashed in COM1 just for the hell of it.
*/
static int ov7670_g_exp(struct v4l2_subdev *sd, __s32 *value)
{
int ret;
unsigned char com1, aech, aechh;
ret = ov7670_read(sd, REG_COM1, &com1) +
ov7670_read(sd, REG_AECH, &aech) +
ov7670_read(sd, REG_AECHH, &aechh);
*value = ((aechh & 0x3f) << 10) | (aech << 2) | (com1 & 0x03);
return ret;
}
static int ov7670_s_exp(struct v4l2_subdev *sd, int value)
{
int ret;
unsigned char com1, com8, aech, aechh;
ret = ov7670_read(sd, REG_COM1, &com1) +
ov7670_read(sd, REG_COM8, &com8);
ov7670_read(sd, REG_AECHH, &aechh);
if (ret)
return ret;
com1 = (com1 & 0xfc) | (value & 0x03);
aech = (value >> 2) & 0xff;
aechh = (aechh & 0xc0) | ((value >> 10) & 0x3f);
ret = ov7670_write(sd, REG_COM1, com1) +
ov7670_write(sd, REG_AECH, aech) +
ov7670_write(sd, REG_AECHH, aechh);
/* Have to turn off AEC as well */
if (ret == 0)
ret = ov7670_write(sd, REG_COM8, com8 & ~COM8_AEC);
return ret;
}
/*
* Tweak autoexposure.
*/
static int ov7670_g_autoexp(struct v4l2_subdev *sd, __s32 *value)
{
int ret;
unsigned char com8;
enum v4l2_exposure_auto_type *atype = (enum v4l2_exposure_auto_type *) value;
ret = ov7670_read(sd, REG_COM8, &com8);
if (com8 & COM8_AEC)
*value = V4L2_EXPOSURE_AUTO;
else
*value = V4L2_EXPOSURE_MANUAL;
return ret;
}
static int ov7670_s_autoexp(struct v4l2_subdev *sd,
enum v4l2_exposure_auto_type value)
{
int ret;
unsigned char com8;
ret = ov7670_read(sd, REG_COM8, &com8);
if (ret == 0) {
if (value == V4L2_EXPOSURE_AUTO)
com8 |= COM8_AEC;
else
com8 &= ~COM8_AEC;
ret = ov7670_write(sd, REG_COM8, com8);
}
return ret;
}
static int ov7670_queryctrl(struct v4l2_subdev *sd,
@ -1212,6 +1285,10 @@ static int ov7670_queryctrl(struct v4l2_subdev *sd,
return v4l2_ctrl_query_fill(qc, 0, 255, 1, 128);
case V4L2_CID_AUTOGAIN:
return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
case V4L2_CID_EXPOSURE:
return v4l2_ctrl_query_fill(qc, 0, 65535, 1, 500);
case V4L2_CID_EXPOSURE_AUTO:
return v4l2_ctrl_query_fill(qc, 0, 1, 1, 0);
}
return -EINVAL;
}
@ -1235,6 +1312,10 @@ static int ov7670_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
return ov7670_g_gain(sd, &ctrl->value);
case V4L2_CID_AUTOGAIN:
return ov7670_g_autogain(sd, &ctrl->value);
case V4L2_CID_EXPOSURE:
return ov7670_g_exp(sd, &ctrl->value);
case V4L2_CID_EXPOSURE_AUTO:
return ov7670_g_autoexp(sd, &ctrl->value);
}
return -EINVAL;
}
@ -1258,6 +1339,11 @@ static int ov7670_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
return ov7670_s_gain(sd, ctrl->value);
case V4L2_CID_AUTOGAIN:
return ov7670_s_autogain(sd, ctrl->value);
case V4L2_CID_EXPOSURE:
return ov7670_s_exp(sd, ctrl->value);
case V4L2_CID_EXPOSURE_AUTO:
return ov7670_s_autoexp(sd,
(enum v4l2_exposure_auto_type) ctrl->value);
}
return -EINVAL;
}