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media: ov7740: enable to get exposure control in autoexposure mode 

The exposure control is clustered with the autoexposure control and
flagged as volatile, but the g_volatile_ctrl() doesn't handle
V4L2_CID_EXPOSURE_AUTO.  So, the value of the exposure control can't be
read in autoexposure mode.

This enables to get the exposure control in autoexposure mode by making
ov7740_get_volatile_ctrl() deal with V4L2_CID_EXPOSURE_AUTO.

This also sets the exposure control as volatile by specifying the
argument to v4l2_ctrl_auto_cluster() instead of manually flagging it.

Cc: Wenyou Yang <wenyou.yang@microchip.com>
Cc: Eugen Hristev <eugen.hristev@microchip.com>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Akinobu Mita 2019-03-18 11:25:43 -04:00 committed by Mauro Carvalho Chehab
parent 05fa38fd63
commit c4b50cabd6
1 changed files with 25 additions and 3 deletions
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28
drivers/media/i2c/ov7740.c
View File

@ -448,6 +448,27 @@ static int ov7740_get_gain(struct ov7740 *ov7740, struct v4l2_ctrl *ctrl)
return 0;
}
static int ov7740_get_exp(struct ov7740 *ov7740, struct v4l2_ctrl *ctrl)
{
struct regmap *regmap = ov7740->regmap;
unsigned int value0, value1;
int ret;
if (ctrl->val == V4L2_EXPOSURE_MANUAL)
return 0;
ret = regmap_read(regmap, REG_AEC, &value0);
if (ret)
return ret;
ret = regmap_read(regmap, REG_HAEC, &value1);
if (ret)
return ret;
ov7740->exposure->val = (value1 << 8) | (value0 & 0xff);
return 0;
}
static int ov7740_set_exp(struct regmap *regmap, int value)
{
int ret;
@ -494,6 +515,9 @@ static int ov7740_get_volatile_ctrl(struct v4l2_ctrl *ctrl)
case V4L2_CID_AUTOGAIN:
ret = ov7740_get_gain(ov7740, ctrl);
break;
case V4L2_CID_EXPOSURE_AUTO:
ret = ov7740_get_exp(ov7740, ctrl);
break;
default:
ret = -EINVAL;
break;
@ -991,8 +1015,6 @@ static int ov7740_init_controls(struct ov7740 *ov7740)
ov7740->exposure = v4l2_ctrl_new_std(ctrl_hdlr, &ov7740_ctrl_ops,
V4L2_CID_EXPOSURE, 0, 65535, 1, 500);
if (ov7740->exposure)
ov7740->exposure->flags |= V4L2_CTRL_FLAG_VOLATILE;
ov7740->auto_exposure = v4l2_ctrl_new_std_menu(ctrl_hdlr,
&ov7740_ctrl_ops,
@ -1003,7 +1025,7 @@ static int ov7740_init_controls(struct ov7740 *ov7740)
v4l2_ctrl_auto_cluster(3, &ov7740->auto_wb, 0, false);
v4l2_ctrl_auto_cluster(2, &ov7740->auto_gain, 0, true);
v4l2_ctrl_auto_cluster(2, &ov7740->auto_exposure,
V4L2_EXPOSURE_MANUAL, false);
V4L2_EXPOSURE_MANUAL, true);
v4l2_ctrl_cluster(2, &ov7740->hflip);
if (ctrl_hdlr->error) {