linux-kernel - [PATCH 5/8] media/usb/pvrusb2: Support for V4L2_CTRL_WHICH_DEF

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Date:	Fri, 21 Aug 2015 11:29:43 +0200
From:	Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
To:	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Mike Isely <isely@...ox.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Hans Verkuil <hans.verkuil@...co.com>,
	Steven Toth <stoth@...nellabs.com>,
	Sakari Ailus <sakari.ailus@...ux.intel.com>,
	Vincent Palatin <vpalatin@...omium.org>,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
Subject: [PATCH 5/8] media/usb/pvrusb2: Support for V4L2_CTRL_WHICH_DEF_VAL

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@...il.com>
---
 drivers/media/usb/pvrusb2/pvrusb2-v4l2.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/media/usb/pvrusb2/pvrusb2-v4l2.c b/drivers/media/usb/pvrusb2/pvrusb2-v4l2.c
index 1c5f85bf7ed4..43b2f2214798 100644
--- a/drivers/media/usb/pvrusb2/pvrusb2-v4l2.c
+++ b/drivers/media/usb/pvrusb2/pvrusb2-v4l2.c
@@ -628,6 +628,7 @@ static int pvr2_g_ext_ctrls(struct file *file, void *priv,
 	struct pvr2_v4l2_fh *fh = file->private_data;
 	struct pvr2_hdw *hdw = fh->channel.mc_head->hdw;
 	struct v4l2_ext_control *ctrl;
+	struct pvr2_ctrl *cptr;
 	unsigned int idx;
 	int val;
 	int ret;
@@ -635,8 +636,18 @@ static int pvr2_g_ext_ctrls(struct file *file, void *priv,
 	ret = 0;
 	for (idx = 0; idx < ctls->count; idx++) {
 		ctrl = ctls->controls + idx;
-		ret = pvr2_ctrl_get_value(
+		if (ctls->which == V4L2_CTRL_WHICH_DEF_VAL) {
+			cptr = pvr2_hdw_get_ctrl_v4l(hdw, ctrl->id);
+			if (cptr)
+				pvr2_ctrl_get_def(cptr, &val);
+			else
+				ret = -EINVAL;
+
+
+		} else
+			ret = pvr2_ctrl_get_value(
 				pvr2_hdw_get_ctrl_v4l(hdw, ctrl->id), &val);
+
 		if (ret) {
 			ctls->error_idx = idx;
 			return ret;
@@ -658,6 +669,10 @@ static int pvr2_s_ext_ctrls(struct file *file, void *priv,
 	unsigned int idx;
 	int ret;
 
+	/* Default value cannot be changed */
+	if (ctls->which == V4L2_CTRL_WHICH_DEF_VAL)
+		return -EINVAL;
+
 	ret = 0;
 	for (idx = 0; idx < ctls->count; idx++) {
 		ctrl = ctls->controls + idx;
-- 
2.5.0

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