Refactor uvc_ctrl to make adding compound control easier.
Currently __uvc_ctrl_get() only work for non-compound controls.
Move the logic into __uvc_ctrl_std(), return error for compound
controls.
Make __uvc_ctrl_get() call __uvc_ctrl_std() inside. Also modify some of the
callers of __uvc_ctrl_get() to call __uvc_ctrl_get_std() instead.
Signed-off-by: Yunke Cao <yunkec@xxxxxxxxxx>
---
Changelog since v11:
- Minor change to avoid negative if statement.
Changelog since v10:
- Better commit message.
Changelog since v9:
- No change.
Changelog since v8:
- No change.
Changelog since v7:
- Newly added patch. Split the refactoring of uvc_ctrl_get from v7 3/7.
drivers/media/usb/uvc/uvc_ctrl.c | 42 +++++++++++++++++++++-----------
1 file changed, 28 insertions(+), 14 deletions(-)
diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index 4a4ceb6289f5..b73a7e3812cf 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -1081,15 +1081,15 @@ static int __uvc_ctrl_load_cur(struct uvc_video_chain *chain,
return ret;
}
-static int __uvc_ctrl_get(struct uvc_video_chain *chain,
- struct uvc_control *ctrl,
- struct uvc_control_mapping *mapping,
- s32 *value)
+static int __uvc_ctrl_get_std(struct uvc_video_chain *chain,
+ struct uvc_control *ctrl,
+ struct uvc_control_mapping *mapping,
+ s32 *value)
{
int ret;
- if ((ctrl->info.flags & UVC_CTRL_FLAG_GET_CUR) == 0)
- return -EACCES;
+ if (uvc_ctrl_mapping_is_compound(mapping))
+ return -EINVAL;
ret = __uvc_ctrl_load_cur(chain, ctrl);
if (ret < 0)
@@ -1199,7 +1199,7 @@ int uvc_ctrl_is_accessible(struct uvc_video_chain *chain, u32 v4l2_id,
if (!master_ctrl || !(master_ctrl->info.flags & UVC_CTRL_FLAG_GET_CUR))
return 0;
- ret = __uvc_ctrl_get(chain, master_ctrl, master_map, &val);
+ ret = __uvc_ctrl_get_std(chain, master_ctrl, master_map, &val);
if (ret >= 0 && val != mapping->master_manual)
return -EACCES;
@@ -1264,8 +1264,13 @@ static int __uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
__uvc_find_control(ctrl->entity, mapping->master_id,
&master_map, &master_ctrl, 0);
if (master_ctrl && (master_ctrl->info.flags & UVC_CTRL_FLAG_GET_CUR)) {
- s32 val;
- int ret = __uvc_ctrl_get(chain, master_ctrl, master_map, &val);
+ s32 val = 0;
+ int ret;
+
+ if (uvc_ctrl_mapping_is_compound(master_map))
+ return -EINVAL;
+
+ ret = __uvc_ctrl_get_std(chain, master_ctrl, master_map, &val);
if (ret < 0)
return ret;
@@ -1529,7 +1534,8 @@ static void uvc_ctrl_send_slave_event(struct uvc_video_chain *chain,
if (ctrl == NULL)
return;
- if (__uvc_ctrl_get(chain, ctrl, mapping, &val) == 0)
+ if (uvc_ctrl_mapping_is_compound(mapping) ||
+ __uvc_ctrl_get_std(chain, ctrl, mapping, &val) == 0)
changes |= V4L2_EVENT_CTRL_CH_VALUE;
uvc_ctrl_send_event(chain, handle, ctrl, mapping, val, changes);
@@ -1700,7 +1706,8 @@ static int uvc_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
s32 val = 0;
- if (__uvc_ctrl_get(handle->chain, ctrl, mapping, &val) == 0)
+ if (uvc_ctrl_mapping_is_compound(mapping) ||
+ __uvc_ctrl_get_std(handle->chain, ctrl, mapping, &val) == 0)
changes |= V4L2_EVENT_CTRL_CH_VALUE;
uvc_ctrl_fill_event(handle->chain, &ev, ctrl, mapping, val,
@@ -1880,7 +1887,10 @@ int uvc_ctrl_get(struct uvc_video_chain *chain,
if (ctrl == NULL)
return -EINVAL;
- return __uvc_ctrl_get(chain, ctrl, mapping, &xctrl->value);
+ if (uvc_ctrl_mapping_is_compound(mapping))
+ return -EINVAL;
+ else
+ return __uvc_ctrl_get_std(chain, ctrl, mapping, &xctrl->value);
}
static int __uvc_ctrl_get_boundary_std(struct uvc_video_chain *chain,
@@ -2039,8 +2049,12 @@ int uvc_ctrl_set(struct uvc_fh *handle,
ctrl->info.size);
}
- mapping->set(mapping, value,
- uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT));
+ if (uvc_ctrl_mapping_is_compound(mapping))
+ return -EINVAL;
+ else
+ mapping->set(mapping, value,
+ uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT));
+
if (ctrl->info.flags & UVC_CTRL_FLAG_ASYNCHRONOUS)
ctrl->handle = handle;
--
2.41.0.694.ge786442a9b-goog
