#include <media/v4l2-ioctl.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ctrls.h>
+#include <media/v4l2-event.h>
#include <media/v4l2-dev.h>
+#define has_op(master, op) \
+ (master->ops && master->ops->op)
+#define call_op(master, op) \
+ (has_op(master, op) ? master->ops->op(master) : 0)
+
/* Internal temporary helper struct, one for each v4l2_ext_control */
struct ctrl_helper {
/* The control corresponding to the v4l2_ext_control ID field. */
bool handled;
};
+/* Small helper function to determine if the autocluster is set to manual
+ mode. In that case the is_volatile flag should be ignored. */
+static bool is_cur_manual(const struct v4l2_ctrl *master)
+{
+ return master->is_auto && master->cur.val == master->manual_mode_value;
+}
+
+/* Same as above, but this checks the against the new value instead of the
+ current value. */
+static bool is_new_manual(const struct v4l2_ctrl *master)
+{
+ return master->is_auto && master->val == master->manual_mode_value;
+}
+
/* Returns NULL or a character pointer array containing the menu for
the given control ID. The pointer array ends with a NULL pointer.
An empty string signifies a menu entry that is invalid. This allows
}
}
+static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
+{
+ memset(ev->reserved, 0, sizeof(ev->reserved));
+ ev->type = V4L2_EVENT_CTRL;
+ ev->id = ctrl->id;
+ ev->u.ctrl.changes = changes;
+ ev->u.ctrl.type = ctrl->type;
+ ev->u.ctrl.flags = ctrl->flags;
+ if (ctrl->type == V4L2_CTRL_TYPE_STRING)
+ ev->u.ctrl.value64 = 0;
+ else
+ ev->u.ctrl.value64 = ctrl->cur.val64;
+ ev->u.ctrl.minimum = ctrl->minimum;
+ ev->u.ctrl.maximum = ctrl->maximum;
+ if (ctrl->type == V4L2_CTRL_TYPE_MENU)
+ ev->u.ctrl.step = 1;
+ else
+ ev->u.ctrl.step = ctrl->step;
+ ev->u.ctrl.default_value = ctrl->default_value;
+}
+
+static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
+{
+ struct v4l2_event ev;
+ struct v4l2_ctrl_fh *pos;
+
+ if (list_empty(&ctrl->fhs))
+ return;
+ fill_event(&ev, ctrl, changes);
+
+ list_for_each_entry(pos, &ctrl->fhs, node)
+ if (pos->fh != fh)
+ v4l2_event_queue_fh(pos->fh, &ev);
+}
+
/* Helper function: copy the current control value back to the caller */
static int cur_to_user(struct v4l2_ext_control *c,
struct v4l2_ctrl *ctrl)
return 0;
}
+static int ctrl_to_user(struct v4l2_ext_control *c,
+ struct v4l2_ctrl *ctrl)
+{
+ if (ctrl->is_volatile)
+ return new_to_user(c, ctrl);
+ return cur_to_user(c, ctrl);
+}
+
+static int ctrl_is_volatile(struct v4l2_ext_control *c,
+ struct v4l2_ctrl *ctrl)
+{
+ return ctrl->is_volatile;
+}
+
/* Copy the new value to the current value. */
-static void new_to_cur(struct v4l2_ctrl *ctrl)
+static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
+ bool update_inactive)
{
+ bool changed = false;
+
if (ctrl == NULL)
return;
switch (ctrl->type) {
+ case V4L2_CTRL_TYPE_BUTTON:
+ changed = true;
+ break;
case V4L2_CTRL_TYPE_STRING:
/* strings are always 0-terminated */
+ changed = strcmp(ctrl->string, ctrl->cur.string);
strcpy(ctrl->cur.string, ctrl->string);
break;
case V4L2_CTRL_TYPE_INTEGER64:
+ changed = ctrl->val64 != ctrl->cur.val64;
ctrl->cur.val64 = ctrl->val64;
break;
default:
+ changed = ctrl->val != ctrl->cur.val;
ctrl->cur.val = ctrl->val;
break;
}
+ if (update_inactive) {
+ ctrl->flags &= ~V4L2_CTRL_FLAG_INACTIVE;
+ if (!is_cur_manual(ctrl->cluster[0]))
+ ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
+ }
+ if (changed || update_inactive)
+ send_event(fh, ctrl,
+ (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) |
+ (update_inactive ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
}
/* Copy the current value to the new value */
{
struct v4l2_ctrl_ref *ref, *next_ref;
struct v4l2_ctrl *ctrl, *next_ctrl;
+ struct v4l2_ctrl_fh *ctrl_fh, *next_ctrl_fh;
if (hdl == NULL || hdl->buckets == NULL)
return;
/* Free all controls owned by the handler */
list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
list_del(&ctrl->node);
+ list_for_each_entry_safe(ctrl_fh, next_ctrl_fh, &ctrl->fhs, node) {
+ list_del(&ctrl_fh->node);
+ kfree(ctrl_fh);
+ }
kfree(ctrl);
}
kfree(hdl->buckets);
insertion is an O(1) operation. */
if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
list_add_tail(&new_ref->node, &hdl->ctrl_refs);
+ hdl->nr_of_refs++;
goto insert_in_hash;
}
}
INIT_LIST_HEAD(&ctrl->node);
+ INIT_LIST_HEAD(&ctrl->fhs);
ctrl->handler = hdl;
ctrl->ops = ops;
ctrl->id = id;
/* Skip handler-private controls. */
if (ctrl->is_private)
continue;
+ /* And control classes */
+ if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
+ continue;
ret = handler_new_ref(hdl, ctrl);
if (ret)
break;
int i;
/* The first control is the master control and it must not be NULL */
- BUG_ON(controls[0] == NULL);
+ BUG_ON(ncontrols == 0 || controls[0] == NULL);
for (i = 0; i < ncontrols; i++) {
if (controls[i]) {
}
EXPORT_SYMBOL(v4l2_ctrl_cluster);
+void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
+ u8 manual_val, bool set_volatile)
+{
+ struct v4l2_ctrl *master = controls[0];
+ u32 flag;
+ int i;
+
+ v4l2_ctrl_cluster(ncontrols, controls);
+ WARN_ON(ncontrols <= 1);
+ WARN_ON(manual_val < master->minimum || manual_val > master->maximum);
+ master->is_auto = true;
+ master->manual_mode_value = manual_val;
+ master->flags |= V4L2_CTRL_FLAG_UPDATE;
+ flag = is_cur_manual(master) ? 0 : V4L2_CTRL_FLAG_INACTIVE;
+
+ for (i = 1; i < ncontrols; i++)
+ if (controls[i]) {
+ controls[i]->is_volatile = set_volatile;
+ controls[i]->flags |= flag;
+ }
+}
+EXPORT_SYMBOL(v4l2_ctrl_auto_cluster);
+
/* Activate/deactivate a control. */
void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
{
+ /* invert since the actual flag is called 'inactive' */
+ bool inactive = !active;
+ bool old;
+
if (ctrl == NULL)
return;
- if (!active)
+ if (inactive)
/* set V4L2_CTRL_FLAG_INACTIVE */
- set_bit(4, &ctrl->flags);
+ old = test_and_set_bit(4, &ctrl->flags);
else
/* clear V4L2_CTRL_FLAG_INACTIVE */
- clear_bit(4, &ctrl->flags);
+ old = test_and_clear_bit(4, &ctrl->flags);
+ if (old != inactive)
+ send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
}
EXPORT_SYMBOL(v4l2_ctrl_activate);
these controls. */
void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
{
+ bool old;
+
if (ctrl == NULL)
return;
+ v4l2_ctrl_lock(ctrl);
if (grabbed)
/* set V4L2_CTRL_FLAG_GRABBED */
- set_bit(1, &ctrl->flags);
+ old = test_and_set_bit(1, &ctrl->flags);
else
/* clear V4L2_CTRL_FLAG_GRABBED */
- clear_bit(1, &ctrl->flags);
+ old = test_and_clear_bit(1, &ctrl->flags);
+ if (old != grabbed)
+ send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
+ v4l2_ctrl_unlock(ctrl);
}
EXPORT_SYMBOL(v4l2_ctrl_grab);
if (ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
(ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
continue;
- ret = master->ops->s_ctrl(master);
+ ret = call_op(master, s_ctrl);
if (ret)
break;
for (i = 0; i < master->ncontrols; i++)
Find the controls in the control array and do some basic checks. */
static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
struct v4l2_ext_controls *cs,
- struct ctrl_helper *helpers,
- bool try)
+ struct ctrl_helper *helpers)
{
u32 i;
struct v4l2_ctrl *ctrl;
u32 id = c->id & V4L2_CTRL_ID_MASK;
- if (try)
- cs->error_idx = i;
+ cs->error_idx = i;
if (cs->ctrl_class && V4L2_CTRL_ID2CLASS(id) != cs->ctrl_class)
return -EINVAL;
struct ctrl_helper helper[4];
struct ctrl_helper *helpers = helper;
int ret;
- int i;
+ int i, j;
cs->error_idx = cs->count;
cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
return -ENOMEM;
}
- ret = prepare_ext_ctrls(hdl, cs, helpers, false);
+ ret = prepare_ext_ctrls(hdl, cs, helpers);
+ cs->error_idx = cs->count;
for (i = 0; !ret && i < cs->count; i++)
if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
for (i = 0; !ret && i < cs->count; i++) {
struct v4l2_ctrl *ctrl = helpers[i].ctrl;
struct v4l2_ctrl *master = ctrl->cluster[0];
+ bool has_volatiles;
if (helpers[i].handled)
continue;
cs->error_idx = i;
+ /* Any volatile controls requested from this cluster? */
+ has_volatiles = ctrl->is_volatile;
+ if (!has_volatiles && has_op(master, g_volatile_ctrl) &&
+ master->ncontrols > 1)
+ has_volatiles = cluster_walk(i, cs, helpers,
+ ctrl_is_volatile);
+
v4l2_ctrl_lock(master);
- /* g_volatile_ctrl will update the current control values */
- if (ctrl->is_volatile && master->ops->g_volatile_ctrl)
- ret = master->ops->g_volatile_ctrl(master);
- /* If OK, then copy the current control values to the caller */
+
+ /* g_volatile_ctrl will update the new control values */
+ if (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);
+ }
+ /* If OK, then copy the current (for non-volatile controls)
+ or the new (for volatile controls) control values to the
+ caller */
if (!ret)
- ret = cluster_walk(i, cs, helpers, cur_to_user);
+ ret = cluster_walk(i, cs, helpers, ctrl_to_user);
v4l2_ctrl_unlock(master);
cluster_done(i, cs, helpers);
}
{
struct v4l2_ctrl *master = ctrl->cluster[0];
int ret = 0;
+ int i;
if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
return -EACCES;
v4l2_ctrl_lock(master);
/* g_volatile_ctrl will update the current control values */
- if (ctrl->is_volatile && master->ops->g_volatile_ctrl)
- ret = master->ops->g_volatile_ctrl(master);
- *val = ctrl->cur.val;
+ if (ctrl->is_volatile && !is_cur_manual(master)) {
+ for (i = 0; i < master->ncontrols; i++)
+ cur_to_new(master->cluster[i]);
+ ret = call_op(master, g_volatile_ctrl);
+ *val = ctrl->val;
+ } else {
+ *val = ctrl->cur.val;
+ }
v4l2_ctrl_unlock(master);
return ret;
}
/* 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_control_cluster(struct v4l2_ctrl *master, bool set)
+static int try_or_set_control_cluster(struct v4l2_fh *fh,
+ struct v4l2_ctrl *master, bool set)
{
+ bool update_flag;
bool try = !set;
int ret = 0;
int i;
/* For larger clusters you have to call try_ctrl again to
verify that the controls are still valid after the
'cur_to_new' above. */
- if (!ret && master->ops->try_ctrl && try)
- ret = master->ops->try_ctrl(master);
+ if (!ret && try)
+ ret = call_op(master, try_ctrl);
/* Don't set if there is no change */
- if (!ret && set && cluster_changed(master)) {
- ret = master->ops->s_ctrl(master);
- /* If OK, then make the new values permanent. */
- if (!ret)
- for (i = 0; i < master->ncontrols; i++)
- new_to_cur(master->cluster[i]);
- }
- return ret;
+ if (ret || !set || !cluster_changed(master))
+ return ret;
+ ret = call_op(master, s_ctrl);
+ /* If OK, then make the new values permanent. */
+ if (ret)
+ return ret;
+
+ update_flag = is_cur_manual(master) != is_new_manual(master);
+ for (i = 0; i < master->ncontrols; i++)
+ new_to_cur(fh, master->cluster[i], update_flag && i > 0);
+ return 0;
}
/* Try or set controls. */
-static int try_or_set_ext_ctrls(struct v4l2_ctrl_handler *hdl,
+static int try_or_set_ext_ctrls(struct v4l2_fh *fh,
+ struct v4l2_ctrl_handler *hdl,
struct v4l2_ext_controls *cs,
struct ctrl_helper *helpers,
bool set)
unsigned i, j;
int ret = 0;
- cs->error_idx = cs->count;
for (i = 0; i < cs->count; i++) {
struct v4l2_ctrl *ctrl = helpers[i].ctrl;
- if (!set)
- cs->error_idx = i;
+ cs->error_idx = i;
if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
return -EACCES;
struct v4l2_ctrl *ctrl = helpers[i].ctrl;
struct v4l2_ctrl *master = ctrl->cluster[0];
- cs->error_idx = i;
-
if (helpers[i].handled)
continue;
+ cs->error_idx = i;
v4l2_ctrl_lock(ctrl);
/* Reset the 'is_new' flags of the cluster */
ret = cluster_walk(i, cs, helpers, user_to_new);
if (!ret)
- ret = try_or_set_control_cluster(master, set);
+ ret = try_or_set_control_cluster(fh, master, set);
/* Copy the new values back to userspace. */
if (!ret)
}
/* Try or try-and-set controls */
-static int try_set_ext_ctrls(struct v4l2_ctrl_handler *hdl,
+static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
struct v4l2_ext_controls *cs,
bool set)
{
if (!helpers)
return -ENOMEM;
}
- ret = prepare_ext_ctrls(hdl, cs, helpers, !set);
- if (ret)
- goto free;
+ ret = prepare_ext_ctrls(hdl, cs, helpers);
/* First 'try' all controls and abort on error */
- ret = try_or_set_ext_ctrls(hdl, cs, helpers, false);
+ if (!ret)
+ ret = try_or_set_ext_ctrls(NULL, hdl, cs, helpers, false);
/* If this is a 'set' operation and the initial 'try' failed,
then set error_idx to count to tell the application that no
controls changed value yet. */
/* Reset 'handled' state */
for (i = 0; i < cs->count; i++)
helpers[i].handled = false;
- ret = try_or_set_ext_ctrls(hdl, cs, helpers, true);
+ ret = try_or_set_ext_ctrls(fh, hdl, cs, helpers, true);
}
-free:
if (cs->count > ARRAY_SIZE(helper))
kfree(helpers);
return ret;
int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
{
- return try_set_ext_ctrls(hdl, cs, false);
+ return try_set_ext_ctrls(NULL, hdl, cs, false);
}
EXPORT_SYMBOL(v4l2_try_ext_ctrls);
-int v4l2_s_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
+int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
+ struct v4l2_ext_controls *cs)
{
- return try_set_ext_ctrls(hdl, cs, true);
+ return try_set_ext_ctrls(fh, hdl, cs, true);
}
EXPORT_SYMBOL(v4l2_s_ext_ctrls);
int v4l2_subdev_try_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
{
- return try_set_ext_ctrls(sd->ctrl_handler, cs, false);
+ return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, false);
}
EXPORT_SYMBOL(v4l2_subdev_try_ext_ctrls);
int v4l2_subdev_s_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
{
- return try_set_ext_ctrls(sd->ctrl_handler, cs, true);
+ return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, true);
}
EXPORT_SYMBOL(v4l2_subdev_s_ext_ctrls);
/* Helper function for VIDIOC_S_CTRL compatibility */
-static int set_ctrl(struct v4l2_ctrl *ctrl, s32 *val)
+static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, s32 *val)
{
struct v4l2_ctrl *master = ctrl->cluster[0];
int ret;
int i;
- if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
- return -EACCES;
-
v4l2_ctrl_lock(ctrl);
/* Reset the 'is_new' flags of the cluster */
ctrl->val = *val;
ctrl->is_new = 1;
- ret = try_or_set_control_cluster(master, false);
+ ret = try_or_set_control_cluster(NULL, master, false);
if (!ret)
- ret = try_or_set_control_cluster(master, true);
+ ret = try_or_set_control_cluster(fh, master, true);
*val = ctrl->cur.val;
v4l2_ctrl_unlock(ctrl);
return ret;
}
-int v4l2_s_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
+int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
+ struct v4l2_control *control)
{
struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
if (ctrl == NULL || !type_is_int(ctrl))
return -EINVAL;
- return set_ctrl(ctrl, &control->value);
+ if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
+ return -EACCES;
+
+ return set_ctrl(fh, ctrl, &control->value);
}
EXPORT_SYMBOL(v4l2_s_ctrl);
int v4l2_subdev_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
{
- return v4l2_s_ctrl(sd->ctrl_handler, control);
+ return v4l2_s_ctrl(NULL, sd->ctrl_handler, control);
}
EXPORT_SYMBOL(v4l2_subdev_s_ctrl);
{
/* It's a driver bug if this happens. */
WARN_ON(!type_is_int(ctrl));
- return set_ctrl(ctrl, &val);
+ return set_ctrl(NULL, ctrl, &val);
}
EXPORT_SYMBOL(v4l2_ctrl_s_ctrl);
+
+void v4l2_ctrl_add_fh(struct v4l2_ctrl_handler *hdl,
+ struct v4l2_ctrl_fh *ctrl_fh,
+ struct v4l2_event_subscription *sub)
+{
+ struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, sub->id);
+
+ v4l2_ctrl_lock(ctrl);
+ list_add_tail(&ctrl_fh->node, &ctrl->fhs);
+ if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
+ (sub->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
+ struct v4l2_event ev;
+
+ fill_event(&ev, ctrl, V4L2_EVENT_CTRL_CH_VALUE |
+ V4L2_EVENT_CTRL_CH_FLAGS);
+ v4l2_event_queue_fh(ctrl_fh->fh, &ev);
+ }
+ v4l2_ctrl_unlock(ctrl);
+}
+EXPORT_SYMBOL(v4l2_ctrl_add_fh);
+
+void v4l2_ctrl_del_fh(struct v4l2_ctrl *ctrl, struct v4l2_fh *fh)
+{
+ struct v4l2_ctrl_fh *pos;
+
+ v4l2_ctrl_lock(ctrl);
+ list_for_each_entry(pos, &ctrl->fhs, node) {
+ if (pos->fh == fh) {
+ list_del(&pos->node);
+ kfree(pos);
+ break;
+ }
+ }
+ v4l2_ctrl_unlock(ctrl);
+}
+EXPORT_SYMBOL(v4l2_ctrl_del_fh);
+
+int v4l2_ctrl_subscribe_fh(struct v4l2_fh *fh,
+ struct v4l2_event_subscription *sub, unsigned n)
+{
+ struct v4l2_ctrl_handler *hdl = fh->ctrl_handler;
+ int ret = 0;
+
+ if (!ret) {
+ if (hdl->nr_of_refs * 2 > n)
+ n = hdl->nr_of_refs * 2;
+ ret = v4l2_event_alloc(fh, n);
+ }
+ if (!ret)
+ ret = v4l2_event_subscribe(fh, sub);
+ return ret;
+}
+EXPORT_SYMBOL(v4l2_ctrl_subscribe_fh);
git.openpandora.org / pandora-kernel.git / blobdiff