[PATCH] v4l2-core: Print control name in VIDIOC_S/G_(EXT)_CTRL(S)

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While debugging, it's currently really hard to identify controls
by their ID. Print the control name making the print more helpful.

With this change, the print changes from:

video1: VIDIOC_S_EXT_CTRLS: which=0xf010000, count=5, error_idx=4, request_fd=45, id/size=0x990ce8/1048, id/size=0x990ce9/12, id/size=0x990cea/480, id/size=0x990ceb/896, id/size=0x990cec/400

to:

video1: VIDIOC_S_EXT_CTRLS: which=0xf010000, count=5, error_idx=4, request_fd=42, name=H264 Sequence Parameter Set, id/size=0x990ce8/1048, name=H264 Picture Parameter Set, id/size=0x990ce9/12, name=H264 Scaling Matrix, id/size=0x990cea/480, name=H264 Slice Parameters, id/size=0x990ceb/896, name=H264 Decode Parameters, id/size=0x990cec/400

For instance, this is specially helpful when the ioctl fails. Consider
the following example:

v4l2-ctrls: prepare_ext_ctrls: video1: pointer control id 0x990cec size too small, 400 bytes but 784 bytes needed
v4l2-ctrls: try_set_ext_ctrls: video1: video1: try_set_ext_ctrls_common failed (-14)
video1: VIDIOC_S_EXT_CTRLS: error -14: which=0xf010000, count=5, error_idx=5, request_fd=39, name=H264 Sequence Parameter Set, id/size=0x990ce8/1048, name=H264 Picture Parameter Set, id/size=0x990ce9/12, name=H264 Scaling Matrix, id/size=0x990cea/480, name=H264 Slice Parameters, id/size=0x990ceb/896, name=H264 Decode Parameters, id/size=0x990cec/400

Signed-off-by: Ezequiel Garcia <ezequiel@xxxxxxxxxxxxx>
---
 drivers/media/v4l2-core/v4l2-ioctl.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
index 2322f08a98be..4264ac44c48b 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -582,8 +582,10 @@ static void v4l_print_querymenu(const void *arg, bool write_only)
 static void v4l_print_control(const void *arg, bool write_only)
 {
 	const struct v4l2_control *p = arg;
+	const char *name = v4l2_ctrl_get_name(p->id);
 
-	pr_cont("id=0x%x, value=%d\n", p->id, p->value);
+	pr_cont("name=%s, id=0x%x, value=%d\n",
+		name ? name : "unknown", p->id, p->value);
 }
 
 static void v4l_print_ext_controls(const void *arg, bool write_only)
@@ -594,12 +596,16 @@ static void v4l_print_ext_controls(const void *arg, bool write_only)
 	pr_cont("which=0x%x, count=%d, error_idx=%d, request_fd=%d",
 			p->which, p->count, p->error_idx, p->request_fd);
 	for (i = 0; i < p->count; i++) {
+		unsigned int id = p->controls[i].id;
+		const char *name = v4l2_ctrl_get_name(id);
+
+		name = name ? name : "unknown";
 		if (!p->controls[i].size)
-			pr_cont(", id/val=0x%x/0x%x",
-				p->controls[i].id, p->controls[i].value);
+			pr_cont(", name=%s, id/val=0x%x/0x%x",
+				name, id, p->controls[i].value);
 		else
-			pr_cont(", id/size=0x%x/%u",
-				p->controls[i].id, p->controls[i].size);
+			pr_cont(", name=%s, id/size=0x%x/%u",
+				name, id, p->controls[i].size);
 	}
 	pr_cont("\n");
 }
-- 
2.26.0.rc2




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