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>

1 files changed, 86 insertions, 0 deletions

diff --git a/drivers/media/video/ov7670.c b/drivers/media/video/ov7670.c
index e7555d1f90e6..90c44598dd51 100644
--- a/drivers/media/video/ov7670.c
+++ b/drivers/media/video/ov7670.c
@@ -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;
 }