From: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
---
drivers/media/v4l2-core/v4l2-ctrls.c | 228 ++++++++++++++++++++++++++++++-----
drivers/media/v4l2-core/v4l2-ioctl.c | 8 ++
include/media/v4l2-ctrls.h | 20 +++
3 files changed, 228 insertions(+), 28 deletions(-)
diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
index e3a3468..d28035c 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -1235,6 +1235,96 @@ static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
v4l2_event_queue_fh(sev->fh, &ev);
}
+static int alloc_requests(struct v4l2_ctrl *ctrl)
+{
+ unsigned i;
+
+ ctrl->request_lists = kmalloc_array(VIDEO_MAX_FRAME,
+ sizeof(struct list_head), GFP_KERNEL);
+ if (ctrl->request_lists == NULL)
+ return -ENOMEM;
+ for (i = 0; i < VIDEO_MAX_FRAME; i++)
+ INIT_LIST_HEAD(ctrl->request_lists + i);
+ return 0;
+}
+
+static struct v4l2_ctrl_req *get_request(struct v4l2_ctrl *ctrl, unsigned request)
+{
+ struct v4l2_ctrl_req *req;
+ struct list_head *head;
+
+ if (ctrl->request_lists == NULL)
+ return NULL;
+ head = ctrl->request_lists + (request % VIDEO_MAX_FRAME);
+ list_for_each_entry(req, head, node)
+ if (req->request == request)
+ return req;
+ return NULL;
+}
+
+static int add_request(struct v4l2_ctrl *ctrl, unsigned request,
+ struct v4l2_ctrl_req **p_req)
+{
+ struct v4l2_ctrl_req *req;
+ struct list_head *head;
+ unsigned idx;
+ int ret;
+
+ if (ctrl->nr_of_requests == ctrl->max_reqs)
+ return -ENOSPC;
+
+ if (ctrl->request_lists == NULL) {
+ ret = alloc_requests(ctrl);
+ if (ret)
+ return ret;
+ }
+ req = kzalloc(sizeof(*req), GFP_KERNEL);
+ if (req == NULL)
+ return -ENOMEM;
+ req->ptr.p = kcalloc(ctrl->elems, ctrl->elem_size, GFP_KERNEL);
+ req->request = request;
+ if (req->ptr.p == NULL) {
+ kfree(req);
+ return -ENOMEM;
+ }
+ head = ctrl->request_lists + (request % VIDEO_MAX_FRAME);
+ for (idx = 0; idx < ctrl->elems; idx++)
+ ctrl->type_ops->init(ctrl, idx, req->ptr);
+ ctrl->nr_of_requests++;
+ list_add(&req->node, head);
+ if (p_req)
+ *p_req = req;
+ return 0;
+}
+
+static void del_request(struct v4l2_ctrl *ctrl, struct v4l2_ctrl_req *req)
+{
+ list_del(&req->node);
+ ctrl->nr_of_requests--;
+ kfree(req->ptr.p);
+ kfree(req);
+}
+
+static void free_requests(struct v4l2_ctrl *ctrl)
+{
+ unsigned idx;
+
+ if (!ctrl->request_lists)
+ return;
+
+ for (idx = 0; idx < VIDEO_MAX_FRAME; idx++) {
+ struct list_head *head = ctrl->request_lists + idx;
+
+ while (!list_empty(head)) {
+ struct v4l2_ctrl_req *req =
+ list_first_entry(head, struct v4l2_ctrl_req, node);
+ del_request(ctrl, req);
+ }
+ }
+ kfree(ctrl->request_lists);
+ ctrl->request_lists = NULL;
+}
+
static bool std_equal(const struct v4l2_ctrl *ctrl, u32 idx,
union v4l2_ctrl_ptr ptr1,
union v4l2_ctrl_ptr ptr2)
@@ -1482,6 +1572,15 @@ static int cur_to_user(struct v4l2_ext_control *c,
return ptr_to_user(c, ctrl, ctrl->p_cur);
}
+/* Helper function: copy the request's control value back to the caller */
+static int request_to_user(struct v4l2_ext_control *c,
+ struct v4l2_ctrl *ctrl)
+{
+ if (ctrl->request == NULL)
+ return ptr_to_user(c, ctrl, ctrl->p_new);
+ return ptr_to_user(c, ctrl, ctrl->request->ptr);
+}
+
/* Helper function: copy the new control value back to the caller */
static int new_to_user(struct v4l2_ext_control *c,
struct v4l2_ctrl *ctrl)
@@ -1589,6 +1688,13 @@ static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
}
}
+/* Helper function: copy the new control value to the request */
+static void new_to_request(struct v4l2_ctrl *ctrl)
+{
+ if (ctrl)
+ ptr_to_ptr(ctrl, ctrl->p_new, ctrl->request->ptr);
+}
+
/* Copy the current value to the new value */
static void cur_to_new(struct v4l2_ctrl *ctrl)
{
@@ -1750,6 +1856,7 @@ void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
list_del(&ctrl->node);
list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
list_del(&sev->node);
+ free_requests(ctrl);
kfree(ctrl);
}
kfree(hdl->buckets);
@@ -2095,8 +2202,10 @@ struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
is_menu ? cfg->menu_skip_mask : step, def,
cfg->dims, cfg->elem_size,
flags, qmenu, qmenu_int, priv);
- if (ctrl)
+ if (ctrl) {
ctrl->is_private = cfg->is_private;
+ ctrl->max_reqs = cfg->max_reqs;
+ }
return ctrl;
}
EXPORT_SYMBOL(v4l2_ctrl_new_custom);
@@ -2289,18 +2398,26 @@ EXPORT_SYMBOL(v4l2_ctrl_radio_filter);
void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
{
bool has_volatiles = false;
+ unsigned max_reqs;
int i;
/* The first control is the master control and it must not be NULL */
if (WARN_ON(ncontrols == 0 || controls[0] == NULL))
return;
+ max_reqs = controls[0]->max_reqs;
for (i = 0; i < ncontrols; i++) {
if (controls[i]) {
controls[i]->cluster = controls;
controls[i]->ncontrols = ncontrols;
if (controls[i]->flags & V4L2_CTRL_FLAG_VOLATILE)
has_volatiles = true;
+ /*
+ * The max_reqs value should be the same for all
+ * controls inside the cluster.
+ */
+ if (WARN_ON(controls[i]->max_reqs != max_reqs))
+ controls[i]->max_reqs = max_reqs;
}
}
controls[0]->has_volatiles = has_volatiles;
@@ -2463,6 +2580,7 @@ int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
cur_to_new(master->cluster[i]);
master->cluster[i]->is_new = 1;
master->cluster[i]->done = true;
+ master->cluster[i]->request = NULL;
}
}
ret = call_op(master, s_ctrl);
@@ -2479,10 +2597,11 @@ int v4l2_query_ext_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_query_ext_ctr
{
const unsigned next_flags = V4L2_CTRL_FLAG_NEXT_CTRL | V4L2_CTRL_FLAG_NEXT_COMPOUND;
u32 id = qc->id & V4L2_CTRL_ID_MASK;
+ u32 req = qc->request;
struct v4l2_ctrl_ref *ref;
struct v4l2_ctrl *ctrl;
- if (hdl == NULL)
+ if (hdl == NULL || req > USHRT_MAX)
return -EINVAL;
mutex_lock(hdl->lock);
@@ -2516,6 +2635,7 @@ int v4l2_query_ext_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_query_ext_ctr
is_compound =
ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
if (id < ref->ctrl->id &&
+ (!req || get_request(ref->ctrl, req)) &&
(is_compound & mask) == match)
break;
}
@@ -2530,6 +2650,7 @@ int v4l2_query_ext_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_query_ext_ctr
is_compound =
ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
if (id < ref->ctrl->id &&
+ (!req || get_request(ref->ctrl, req)) &&
(is_compound & mask) == match)
break;
}
@@ -2541,6 +2662,8 @@ int v4l2_query_ext_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_query_ext_ctr
if (!ref)
return -EINVAL;
+ if (req && get_request(ref->ctrl, req) == NULL)
+ return -EINVAL;
ctrl = ref->ctrl;
memset(qc, 0, sizeof(*qc));
@@ -2550,6 +2673,7 @@ int v4l2_query_ext_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_query_ext_ctr
qc->id = ctrl->id;
strlcpy(qc->name, ctrl->name, sizeof(qc->name));
qc->flags = ctrl->flags;
+ qc->max_reqs = ctrl->max_reqs;
qc->type = ctrl->type;
if (ctrl->is_ptr)
qc->flags |= V4L2_CTRL_FLAG_HAS_PAYLOAD;
@@ -2711,6 +2835,8 @@ static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
struct v4l2_ctrl_helper *helpers,
bool get)
{
+ u32 ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
+ unsigned request = cs->request & 0xffff;
struct v4l2_ctrl_helper *h;
bool have_clusters = false;
u32 i;
@@ -2723,7 +2849,7 @@ static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
cs->error_idx = i;
- if (cs->ctrl_class && V4L2_CTRL_ID2CLASS(id) != cs->ctrl_class)
+ if (ctrl_class && V4L2_CTRL_ID2CLASS(id) != ctrl_class)
return -EINVAL;
/* Old-style private controls are not allowed for
@@ -2736,6 +2862,8 @@ static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
ctrl = ref->ctrl;
if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
return -EINVAL;
+ if (request && !ctrl->max_reqs)
+ return -EINVAL;
if (ctrl->cluster[0]->ncontrols > 1)
have_clusters = true;
@@ -2807,24 +2935,26 @@ static int class_check(struct v4l2_ctrl_handler *hdl, u32 ctrl_class)
return find_ref_lock(hdl, ctrl_class | 1) ? 0 : -EINVAL;
}
-
-
/* Get extended controls. Allocates the helpers array if needed. */
int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
{
struct v4l2_ctrl_helper helper[4];
struct v4l2_ctrl_helper *helpers = helper;
+ unsigned request = 0;
int ret;
int i, j;
cs->error_idx = cs->count;
- cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
+ if (V4L2_CTRL_ID2CLASS(cs->ctrl_class))
+ cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
+ else
+ request = cs->request;
- if (hdl == NULL)
+ if (hdl == NULL || request > USHRT_MAX)
return -EINVAL;
if (cs->count == 0)
- return class_check(hdl, cs->ctrl_class);
+ return class_check(hdl, V4L2_CTRL_ID2CLASS(cs->ctrl_class));
if (cs->count > ARRAY_SIZE(helper)) {
helpers = kmalloc_array(cs->count, sizeof(helper[0]),
@@ -2854,13 +2984,27 @@ int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs
v4l2_ctrl_lock(master);
/* g_volatile_ctrl will update the new control values */
- if ((master->flags & V4L2_CTRL_FLAG_VOLATILE) ||
- (master->has_volatiles && !is_cur_manual(master))) {
+ if (request == 0 &&
+ ((master->flags & V4L2_CTRL_FLAG_VOLATILE) ||
+ (master->has_volatiles && !is_cur_manual(master)))) {
for (j = 0; j < master->ncontrols; j++)
cur_to_new(master->cluster[j]);
ret = call_op(master, g_volatile_ctrl);
ctrl_to_user = new_to_user;
}
+ if (request) {
+ for (j = 0; !ret && j < master->ncontrols; j++) {
+ struct v4l2_ctrl *ctrl = master->cluster[j];
+
+ if (!ctrl)
+ continue;
+ ctrl->request = get_request(ctrl, request);
+ if (ctrl->request)
+ continue;
+ ret = add_request(ctrl, request, &ctrl->request);
+ }
+ }
+
/* If OK, then copy the current (for non-volatile controls)
or the new (for volatile controls) control values to the
caller */
@@ -2868,7 +3012,11 @@ int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs
u32 idx = i;
do {
- ret = ctrl_to_user(cs->controls + idx,
+ if (request)
+ ret = request_to_user(cs->controls + idx,
+ helpers[idx].ctrl);
+ else
+ ret = ctrl_to_user(cs->controls + idx,
helpers[idx].ctrl);
idx = helpers[idx].next;
} while (!ret && idx);
@@ -2963,12 +3111,11 @@ s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl)
}
EXPORT_SYMBOL(v4l2_ctrl_g_ctrl_int64);
-
/* Core function that calls try/s_ctrl and ensures that the new value is
copied to the current value on a set.
Must be called with ctrl->handler->lock held. */
static int try_or_set_cluster(struct v4l2_fh *fh, struct v4l2_ctrl *master,
- bool set, u32 ch_flags)
+ u16 request, bool set, u32 ch_flags)
{
bool update_flag;
int ret;
@@ -2980,10 +3127,20 @@ static int try_or_set_cluster(struct v4l2_fh *fh, struct v4l2_ctrl *master,
called. */
for (i = 0; i < master->ncontrols; i++) {
struct v4l2_ctrl *ctrl = master->cluster[i];
+ struct v4l2_ctrl_req *req = NULL;
if (ctrl == NULL)
continue;
+ if (request) {
+ req = get_request(ctrl, request);
+ if (!req) {
+ ret = add_request(ctrl, request, &req);
+ if (ret)
+ return ret;
+ }
+ }
+ ctrl->request = req;
if (!ctrl->is_new) {
cur_to_new(ctrl);
continue;
@@ -2997,7 +3154,7 @@ static int try_or_set_cluster(struct v4l2_fh *fh, struct v4l2_ctrl *master,
ret = call_op(master, try_ctrl);
/* Don't set if there is no change */
- if (ret || !set || !cluster_changed(master))
+ if (ret || !set || (!request && !cluster_changed(master)))
return ret;
ret = call_op(master, s_ctrl);
if (ret)
@@ -3005,9 +3162,13 @@ static int try_or_set_cluster(struct v4l2_fh *fh, struct v4l2_ctrl *master,
/* If OK, then make the new values permanent. */
update_flag = is_cur_manual(master) != is_new_manual(master);
- for (i = 0; i < master->ncontrols; i++)
- new_to_cur(fh, master->cluster[i], ch_flags |
- ((update_flag && i > 0) ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
+ for (i = 0; i < master->ncontrols; i++) {
+ if (request)
+ new_to_request(master->cluster[i]);
+ else
+ new_to_cur(fh, master->cluster[i], ch_flags |
+ ((update_flag && i > 0) ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
+ }
return 0;
}
@@ -3058,8 +3219,12 @@ static void update_from_auto_cluster(struct v4l2_ctrl *master)
{
int i;
- for (i = 0; i < master->ncontrols; i++)
+ for (i = 0; i < master->ncontrols; i++) {
+ if (master->cluster[i] == NULL)
+ continue;
cur_to_new(master->cluster[i]);
+ master->cluster[i]->request = 0;
+ }
if (!call_op(master, g_volatile_ctrl))
for (i = 1; i < master->ncontrols; i++)
if (master->cluster[i])
@@ -3073,17 +3238,21 @@ static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
{
struct v4l2_ctrl_helper helper[4];
struct v4l2_ctrl_helper *helpers = helper;
+ unsigned request = 0;
unsigned i, j;
int ret;
cs->error_idx = cs->count;
- cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
+ if (V4L2_CTRL_ID2CLASS(cs->ctrl_class))
+ cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
+ else
+ request = cs->request;
- if (hdl == NULL)
+ if (hdl == NULL || request > USHRT_MAX)
return -EINVAL;
if (cs->count == 0)
- return class_check(hdl, cs->ctrl_class);
+ return class_check(hdl, V4L2_CTRL_ID2CLASS(cs->ctrl_class));
if (cs->count > ARRAY_SIZE(helper)) {
helpers = kmalloc_array(cs->count, sizeof(helper[0]),
@@ -3118,7 +3287,7 @@ static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
first since those will become the new manual values (which
may be overwritten by explicit new values from this set
of controls). */
- if (master->is_auto && master->has_volatiles &&
+ if (!request && master->is_auto && master->has_volatiles &&
!is_cur_manual(master)) {
/* Pick an initial non-manual value */
s32 new_auto_val = master->manual_mode_value + 1;
@@ -3149,13 +3318,13 @@ static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
} while (!ret && idx);
if (!ret)
- ret = try_or_set_cluster(fh, master, set, 0);
+ ret = try_or_set_cluster(fh, master, request, set, 0);
/* Copy the new values back to userspace. */
if (!ret) {
idx = i;
do {
- ret = new_to_user(cs->controls + idx,
+ ret = request_to_user(cs->controls + idx,
helpers[idx].ctrl);
idx = helpers[idx].next;
} while (!ret && idx);
@@ -3201,9 +3370,12 @@ static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
int i;
/* Reset the 'is_new' flags of the cluster */
- for (i = 0; i < master->ncontrols; i++)
- if (master->cluster[i])
- master->cluster[i]->is_new = 0;
+ for (i = 0; i < master->ncontrols; i++) {
+ if (master->cluster[i] == NULL)
+ continue;
+ master->cluster[i]->is_new = 0;
+ master->cluster[i]->request = NULL;
+ }
ret = validate_new(ctrl, ctrl->p_new);
if (ret)
@@ -3217,7 +3389,7 @@ static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
update_from_auto_cluster(master);
ctrl->is_new = 1;
- return try_or_set_cluster(fh, master, true, ch_flags);
+ return try_or_set_cluster(fh, master, 0, true, ch_flags);
}
/* Helper function for VIDIOC_S_CTRL compatibility */
diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
index d2d1fb1..a16af7f 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -1701,6 +1701,8 @@ static int v4l_query_ext_ctrl(const struct v4l2_ioctl_ops *ops,
return v4l2_query_ext_ctrl(vfh->ctrl_handler, p);
if (vfd->ctrl_handler)
return v4l2_query_ext_ctrl(vfd->ctrl_handler, p);
+ if (p->request)
+ return -EINVAL;
if (ops->vidioc_query_ext_ctrl)
return ops->vidioc_query_ext_ctrl(file, fh, p);
return -ENOTTY;
@@ -1801,6 +1803,8 @@ static int v4l_g_ext_ctrls(const struct v4l2_ioctl_ops *ops,
return v4l2_g_ext_ctrls(vfd->ctrl_handler, p);
if (ops->vidioc_g_ext_ctrls == NULL)
return -ENOTTY;
+ if (p->request)
+ return -EINVAL;
return check_ext_ctrls(p, 0) ? ops->vidioc_g_ext_ctrls(file, fh, p) :
-EINVAL;
}
@@ -1820,6 +1824,8 @@ static int v4l_s_ext_ctrls(const struct v4l2_ioctl_ops *ops,
return v4l2_s_ext_ctrls(NULL, vfd->ctrl_handler, p);
if (ops->vidioc_s_ext_ctrls == NULL)
return -ENOTTY;
+ if (p->request)
+ return -EINVAL;
return check_ext_ctrls(p, 0) ? ops->vidioc_s_ext_ctrls(file, fh, p) :
-EINVAL;
}
@@ -1839,6 +1845,8 @@ static int v4l_try_ext_ctrls(const struct v4l2_ioctl_ops *ops,
return v4l2_try_ext_ctrls(vfd->ctrl_handler, p);
if (ops->vidioc_try_ext_ctrls == NULL)
return -ENOTTY;
+ if (p->request)
+ return -EINVAL;
return check_ext_ctrls(p, 0) ? ops->vidioc_try_ext_ctrls(file, fh, p) :
-EINVAL;
}
diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
index 911f3e5..abc5eb3 100644
--- a/include/media/v4l2-ctrls.h
+++ b/include/media/v4l2-ctrls.h
@@ -92,6 +92,12 @@ struct v4l2_ctrl_type_ops {
typedef void (*v4l2_ctrl_notify_fnc)(struct v4l2_ctrl *ctrl, void *priv);
+struct v4l2_ctrl_req {
+ struct list_head node;
+ u32 request;
+ union v4l2_ctrl_ptr ptr;
+};
+
/** struct v4l2_ctrl - The control structure.
* @node: The list node.
* @ev_subs: The list of control event subscriptions.
@@ -140,6 +146,9 @@ typedef void (*v4l2_ctrl_notify_fnc)(struct v4l2_ctrl *ctrl, void *priv);
* @elem_size: The size in bytes of the control.
* @dims: The size of each dimension.
* @nr_of_dims:The number of dimensions in @dims.
+ * @nr_of_requests: The number of allocated requests of this control.
+ * @max_reqs: The maximum number of requests supported by this control.
+ * @request: The request that the control op operates on.
* @menu_skip_mask: The control's skip mask for menu controls. This makes it
* easy to skip menu items that are not valid. If bit X is set,
* then menu item X is skipped. Of course, this only works for
@@ -191,6 +200,9 @@ struct v4l2_ctrl {
u32 elem_size;
u32 dims[V4L2_CTRL_MAX_DIMS];
u32 nr_of_dims;
+ u16 nr_of_requests;
+ u16 max_reqs;
+ struct v4l2_ctrl_req *request;
union {
u64 step;
u64 menu_skip_mask;
@@ -208,6 +220,7 @@ struct v4l2_ctrl {
union v4l2_ctrl_ptr p_new;
union v4l2_ctrl_ptr p_cur;
+ struct list_head *request_lists;
};
/** struct v4l2_ctrl_ref - The control reference.
@@ -284,6 +297,7 @@ struct v4l2_ctrl_handler {
* must be NULL.
* @is_private: If set, then this control is private to its handler and it
* will not be added to any other handlers.
+ * @max_reqs: The maximum number of requests supported by this control.
*/
struct v4l2_ctrl_config {
const struct v4l2_ctrl_ops *ops;
@@ -302,6 +316,7 @@ struct v4l2_ctrl_config {
const char * const *qmenu;
const s64 *qmenu_int;
unsigned int is_private:1;
+ u16 max_reqs;
};
/** v4l2_ctrl_fill() - Fill in the control fields based on the control ID.
@@ -788,6 +803,11 @@ static inline int v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl *ctrl, const char *s)
return rval;
}
+static inline void v4l2_ctrl_s_max_reqs(struct v4l2_ctrl *ctrl, u16 max_reqs)
+{
+ ctrl->max_reqs = max_reqs;
+}
+
/* Internal helper functions that deal with control events. */
extern const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops;
void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new);
--
2.1.4
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