cx88-blackbird: implement VIDIOC_QUERYCTRL and VIDIOC_QUERYMENU

From: Michael Krufky <mkrufky@linuxtv.org>

This patch implements the newer v4l2 control features to make the
standard user controls and mpeg encoder controls of cx88-blackbird
video encoder boards available to userspace.

Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>

1 files changed, 46 insertions, 13 deletions

diff --git a/linux/drivers/media/video/cx88/cx88-video.c b/linux/drivers/media/video/cx88/cx88-video.c
index 9c2f0dd39..ed5f83fe6 100644
--- a/linux/drivers/media/video/cx88/cx88-video.c
+++ b/linux/drivers/media/video/cx88/cx88-video.c
@@ -350,6 +350,51 @@ static struct cx88_ctrl cx8800_ctls[] = {
 };
 static const int CX8800_CTLS = ARRAY_SIZE(cx8800_ctls);
 
+const u32 cx88_user_ctrls[] = {
+	V4L2_CID_USER_CLASS,
+	V4L2_CID_BRIGHTNESS,
+	V4L2_CID_CONTRAST,
+	V4L2_CID_SATURATION,
+	V4L2_CID_HUE,
+	V4L2_CID_AUDIO_VOLUME,
+	V4L2_CID_AUDIO_BALANCE,
+	V4L2_CID_AUDIO_MUTE,
+	0
+};
+EXPORT_SYMBOL(cx88_user_ctrls);
+
+static const u32 *ctrl_classes[] = {
+	cx88_user_ctrls,
+	NULL
+};
+
+int cx8800_ctrl_query(struct v4l2_queryctrl *qctrl)
+{
+	int i;
+
+	if (qctrl->id < V4L2_CID_BASE ||
+	    qctrl->id >= V4L2_CID_LASTP1)
+		return -EINVAL;
+	for (i = 0; i < CX8800_CTLS; i++)
+		if (cx8800_ctls[i].v.id == qctrl->id)
+			break;
+	if (i == CX8800_CTLS) {
+		*qctrl = no_ctl;
+		return 0;
+	}
+	*qctrl = cx8800_ctls[i].v;
+	return 0;
+}
+EXPORT_SYMBOL(cx8800_ctrl_query);
+
+static int cx88_queryctrl(struct v4l2_queryctrl *qctrl)
+{
+	qctrl->id = v4l2_ctrl_next(ctrl_classes, qctrl->id);
+	if (qctrl->id == 0)
+		return -EINVAL;
+	return cx8800_ctrl_query(qctrl);
+}
+
 /* ------------------------------------------------------------------- */
 /* resource management                                                 */
 
@@ -1652,20 +1697,8 @@ int cx88_do_ioctl(struct inode *inode, struct file *file, int radio,
 	case VIDIOC_QUERYCTRL:
 	{
 		struct v4l2_queryctrl *c = arg;
-		int i;
 
-		if (c->id <  V4L2_CID_BASE ||
-		    c->id >= V4L2_CID_LASTP1)
-			return -EINVAL;
-		for (i = 0; i < CX8800_CTLS; i++)
-			if (cx8800_ctls[i].v.id == c->id)
-				break;
-		if (i == CX8800_CTLS) {
-			*c = no_ctl;
-			return 0;
-		}
-		*c = cx8800_ctls[i].v;
-		return 0;
+		return cx88_queryctrl(c);
 	}
 	case VIDIOC_G_CTRL:
 		return get_control(core,arg);