From 1e55126666944c83bf98243564e25302f363e2a4 Mon Sep 17 00:00:00 2001 From: Hans Verkuil <hverkuil@xs4all.nl> Date: Fri, 8 Aug 2008 08:34:19 -0300 Subject: V4L/DVB (8637): v4l2: add v4l2_ctrl_query_menu_valid_items support function v4l2_ctrl_query_menu_valid_items() makes it easy to handle control menus that have a lot of invalid 'holes'. For example, many MPEG encoders only support a limited subset of audio bitrates. In that case a driver can specify an array listing the set of valid bitrates and pass that to this function. Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com> --- drivers/media/video/v4l2-common.c | 23 ++++++++++++++++++++++- 1 file changed, 22 insertions(+), 1 deletion(-) (limited to 'drivers/media/video/v4l2-common.c') diff --git a/drivers/media/video/v4l2-common.c b/drivers/media/video/v4l2-common.c index da4791de705..a523af78bdb 100644 --- a/drivers/media/video/v4l2-common.c +++ b/drivers/media/video/v4l2-common.c @@ -643,6 +643,7 @@ int v4l2_ctrl_query_menu(struct v4l2_querymenu *qmenu, struct v4l2_queryctrl *qc { int i; + qmenu->reserved = 0; if (menu_items == NULL || (qctrl && (qmenu->index < qctrl->minimum || qmenu->index > qctrl->maximum))) return -EINVAL; @@ -650,11 +651,31 @@ int v4l2_ctrl_query_menu(struct v4l2_querymenu *qmenu, struct v4l2_queryctrl *qc if (menu_items[i] == NULL || menu_items[i][0] == '\0') return -EINVAL; snprintf(qmenu->name, sizeof(qmenu->name), menu_items[qmenu->index]); - qmenu->reserved = 0; return 0; } EXPORT_SYMBOL(v4l2_ctrl_query_menu); +/* Fill in a struct v4l2_querymenu based on the specified array of valid + menu items (terminated by V4L2_CTRL_MENU_IDS_END). + Use this if there are 'holes' in the list of valid menu items. */ +int v4l2_ctrl_query_menu_valid_items(struct v4l2_querymenu *qmenu, const u32 *ids) +{ + const char **menu_items = v4l2_ctrl_get_menu(qmenu->id); + + qmenu->reserved = 0; + if (menu_items == NULL || ids == NULL) + return -EINVAL; + while (*ids != V4L2_CTRL_MENU_IDS_END) { + if (*ids++ == qmenu->index) { + snprintf(qmenu->name, sizeof(qmenu->name), + menu_items[qmenu->index]); + return 0; + } + } + return -EINVAL; +} +EXPORT_SYMBOL(v4l2_ctrl_query_menu_valid_items); + /* ctrl_classes points to an array of u32 pointers, the last element is a NULL pointer. Each u32 array is a 0-terminated array of control IDs. Each array must be sorted low to high and belong to the same control -- cgit v1.2.2