Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1258713

[PATCH v2 4/6] usb/uvc: Support for V4L2_CTRL_WHICH_DEF_VAL

Show all headers | View raw

This driver does not use the control infrastructure.
Add support for the new field which on structure
 v4l2_ext_controls

Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
---
 drivers/media/usb/uvc/uvc_v4l2.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
index 2764f43607c1..d7723ce772b3 100644
--- a/drivers/media/usb/uvc/uvc_v4l2.c
+++ b/drivers/media/usb/uvc/uvc_v4l2.c
@@ -983,6 +983,22 @@ static int uvc_ioctl_g_ext_ctrls(struct file *file, void *fh,
 	unsigned int i;
 	int ret;
 
+	if (ctrls->which == V4L2_CTRL_WHICH_DEF_VAL) {
+		for (i = 0; i < ctrls->count; ++ctrl, ++i) {
+			struct v4l2_queryctrl qc = { .id = ctrl->id };
+
+			ret = uvc_query_v4l2_ctrl(chain, &qc);
+			if (ret < 0) {
+				ctrls->error_idx = i;
+				return ret;
+			}
+
+			ctrl->value = qc.default_value;
+		}
+
+		return 0;
+	}
+
 	ret = uvc_ctrl_begin(chain);
 	if (ret < 0)
 		return ret;
@@ -1010,6 +1026,10 @@ static int uvc_ioctl_s_try_ext_ctrls(struct uvc_fh *handle,
 	unsigned int i;
 	int ret;
 
+	/* Default value cannot be changed */
+	if (ctrls->which == V4L2_CTRL_WHICH_DEF_VAL)
+		return -EINVAL;
+
 	ret = uvc_ctrl_begin(chain);
 	if (ret < 0)
 		return ret;
-- 
2.6.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

[PATCH v2 0/6] Support getting default values from any control Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com> - 2015-10-29 11:20 +0100
  [PATCH v2 4/6] usb/uvc: Support for V4L2_CTRL_WHICH_DEF_VAL Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com> - 2015-10-29 11:20 +0100
    Re: [PATCH v2 4/6] usb/uvc: Support for V4L2_CTRL_WHICH_DEF_VAL Laurent Pinchart <laurent.pinchart@ideasonboard.com> - 2015-10-30 15:30 +0100
  [PATCH v2 5/6] media/usb/pvrusb2: Support for V4L2_CTRL_WHICH_DEF_VAL Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com> - 2015-10-29 11:20 +0100
    Re: [PATCH v2 5/6] media/usb/pvrusb2: Support for  V4L2_CTRL_WHICH_DEF_VAL Mike Isely <isely@isely.net> - 2015-10-29 16:40 +0100

csiph-web