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>

diff --git a/drivers/media/i2c/ov7740.c b/drivers/media/i2c/ov7740.c
index dfece91..54e80a6 100644 (file)
--- a/drivers/media/i2c/ov7740.c
+++ b/drivers/media/i2c/ov7740.c
@@ -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) {