From a69a7a33268308ddcc9abf0f7d7cd61ec4300cbe Mon Sep 17 00:00:00 2001 From: Ezequiel Garcia Date: Wed, 1 Jul 2020 15:17:30 +0200 Subject: [PATCH] v4l2-core: Print control name in VIDIOC_S/G_(EXT)_CTRL(S) 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 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 Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- drivers/media/v4l2-core/v4l2-ioctl.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c index 02bfef0..a556880 100644 --- a/drivers/media/v4l2-core/v4l2-ioctl.c +++ b/drivers/media/v4l2-core/v4l2-ioctl.c @@ -582,7 +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); + if (name) + pr_cont("name=%s, ", name); pr_cont("id=0x%x, value=%d\n", p->id, p->value); } @@ -594,12 +597,15 @@ 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); + + if (name) + pr_cont(", name=%s", name); if (!p->controls[i].size) - pr_cont(", id/val=0x%x/0x%x", - p->controls[i].id, p->controls[i].value); + pr_cont(", id/val=0x%x/0x%x", id, p->controls[i].value); else - pr_cont(", id/size=0x%x/%u", - p->controls[i].id, p->controls[i].size); + pr_cont(", id/size=0x%x/%u", id, p->controls[i].size); } pr_cont("\n"); } -- 2.7.4