Thanks for the review. On Thu, May 26, 2022 at 11:36 PM Ricardo Ribalda <ribalda@xxxxxxxxxxxx> wrote: > > Hi Yunke, > > thanks for your patch > > On Thu, 26 May 2022 at 07:08, Yunke Cao <yunkec@xxxxxxxxxx> wrote: > > > > Implement support for ROI as described in UVC 1.5: > > 4.2.2.1.20 Digital Region of Interest (ROI) Control > > > > ROI control is implemented using V4L2 control API as > > two uvc-specific controls: > > V4L2_CID_UVC_REGION_OF_INTEREST_RECT and > > V4L2_CID_UVC_REGION_OF_INTEREST_AUTO. > > > > Signed-off-by: Yunke Cao <yunkec@xxxxxxxxxx> > > --- > > References a rejected attempt that uses v4l2 selection API: > > https://lore.kernel.org/lkml/20210501082001.100533-2-senozhatsky@xxxxxxxxxxxx > > Changelog since v4: > > -Check boundary condition: width or height == 0. > > -Populate xctrl->id and xctrl->size. > > -Split code for V4L2_CTRL_WHICH_MIN/MAX_VAL to patch 4/5. > > > > drivers/media/usb/uvc/uvc_ctrl.c | 207 ++++++++++++++++++++++++++--- > > drivers/media/usb/uvc/uvc_v4l2.c | 8 +- > > drivers/media/usb/uvc/uvcvideo.h | 10 +- > > include/uapi/linux/usb/video.h | 1 + > > include/uapi/linux/uvcvideo.h | 13 ++ > > include/uapi/linux/v4l2-controls.h | 8 ++ > > 6 files changed, 223 insertions(+), 24 deletions(-) > > > > diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c > > index b4f6edf968bc..c470861e408a 100644 > > --- a/drivers/media/usb/uvc/uvc_ctrl.c > > +++ b/drivers/media/usb/uvc/uvc_ctrl.c > > @@ -355,6 +355,16 @@ static const struct uvc_control_info uvc_ctrls[] = { > > .flags = UVC_CTRL_FLAG_GET_CUR > > | UVC_CTRL_FLAG_AUTO_UPDATE, > > }, > > + { > > + .entity = UVC_GUID_UVC_CAMERA, > > + .selector = UVC_CT_REGION_OF_INTEREST_CONTROL, > > + .index = 21, > > + .size = 10, > > + .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_CUR > > + | UVC_CTRL_FLAG_GET_MIN | UVC_CTRL_FLAG_GET_MAX > > + | UVC_CTRL_FLAG_GET_DEF > > + | UVC_CTRL_FLAG_AUTO_UPDATE, > > + }, > > }; > > > > static const u32 uvc_control_classes[] = { > > @@ -728,6 +738,24 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = { > > .v4l2_type = V4L2_CTRL_TYPE_BOOLEAN, > > .data_type = UVC_CTRL_DATA_TYPE_BOOLEAN, > > }, > > + { > > + .id = V4L2_CID_UVC_REGION_OF_INTEREST_RECT, > > + .entity = UVC_GUID_UVC_CAMERA, > > + .selector = UVC_CT_REGION_OF_INTEREST_CONTROL, > > + .size = 64, > > + .offset = 0, > > + .v4l2_type = V4L2_CTRL_TYPE_RECT, > > + .data_type = UVC_CTRL_DATA_TYPE_RECT, > > + }, > > + { > > + .id = V4L2_CID_UVC_REGION_OF_INTEREST_AUTO, > > + .entity = UVC_GUID_UVC_CAMERA, > > + .selector = UVC_CT_REGION_OF_INTEREST_CONTROL, > > + .size = 16, > > + .offset = 64, > > + .v4l2_type = V4L2_CTRL_TYPE_BITMASK, > > + .data_type = UVC_CTRL_DATA_TYPE_BITMASK, > > + }, > > }; > > > > /* ------------------------------------------------------------------------ > > @@ -749,6 +777,34 @@ static inline void uvc_clear_bit(u8 *data, int bit) > > data[bit >> 3] &= ~(1 << (bit & 7)); > > } > > > > +static void uvc_to_v4l2_rect(struct v4l2_rect *v4l2_rect, > > + const struct uvc_rect *uvc_rect) > > +{ > > + v4l2_rect->top = uvc_rect->top; > > + v4l2_rect->left = uvc_rect->left; > > + v4l2_rect->height = uvc_rect->bottom - uvc_rect->top + 1; > > + v4l2_rect->width = uvc_rect->right - uvc_rect->left + 1; > > +} > > + > > +static int v4l2_to_uvc_rect(struct uvc_rect *uvc_rect, > > + const struct v4l2_rect *v4l2_rect) > > +{ > > + // Safely converts s32 and u32 to u16. > > + if (v4l2_rect->top > U16_MAX || v4l2_rect->top < 0 || > > + v4l2_rect->left > U16_MAX || v4l2_rect->left < 0 || > > + v4l2_rect->height > U16_MAX || v4l2_rect->height == 0 || > > + v4l2_rect->width > U16_MAX || v4l2_rect->width == 0 || > > + v4l2_rect->height + v4l2_rect->top - 1 > U16_MAX || > > + v4l2_rect->width + v4l2_rect->left - 1 > U16_MAX) > > + return -ERANGE; > > + > > + uvc_rect->top = v4l2_rect->top; > > + uvc_rect->left = v4l2_rect->left; > > + uvc_rect->bottom = v4l2_rect->height + v4l2_rect->top - 1; > > + uvc_rect->right = v4l2_rect->width + v4l2_rect->left - 1; > > + return 0; > > +} > > + > > /* Extract the bit string specified by mapping->offset and mapping->size > > * from the little-endian data stored at 'data' and return the result as > > * a signed 32bit integer. Sign extension will be performed if the mapping > > @@ -963,11 +1019,23 @@ static s32 __uvc_ctrl_get_value(struct uvc_control_mapping *mapping, > > return value; > > } > > > > +static void __uvc_ctrl_get_v4l2_rect(struct uvc_control *ctrl, > > + struct uvc_control_mapping *mapping, > > + u32 id, > > + struct v4l2_rect *rect) > > +{ > > + struct uvc_rect *uvc_rect = > > + (struct uvc_rect *)(uvc_ctrl_data(ctrl, id) > > + + mapping->offset / 8); > > + uvc_to_v4l2_rect(rect, uvc_rect); > > +} > > + > > static int __uvc_ctrl_get(struct uvc_video_chain *chain, > > struct uvc_control *ctrl, struct uvc_control_mapping *mapping, > > - s32 *value) > > + struct v4l2_ext_control *xctrl) > > { > > We need to be a bit careful here. Now we need that xctrl->p_rect > points to a correct location and that is not true in other parts of > the code. > > Maybe you want to want to make > > __uvc_ctrl_get-> return -EINVAL for for V4L2_CTRL_TYPE_RECT > > and a new > > __uvc_ctrl_get_p_rect_to_user (and tha way me make explicit the namespace) > Ok. Will do that in V6. > > int ret; > > + struct v4l2_rect v4l2_rect = {}; > > > > if ((ctrl->info.flags & UVC_CTRL_FLAG_GET_CUR) == 0) > > return -EACCES; > > @@ -993,8 +1061,19 @@ static int __uvc_ctrl_get(struct uvc_video_chain *chain, > > ctrl->loaded = 1; > > } > > > > - *value = __uvc_ctrl_get_value(mapping, > > + xctrl->id = mapping->id; > > + switch (mapping->v4l2_type) { > > + case V4L2_CTRL_TYPE_RECT: > > + __uvc_ctrl_get_v4l2_rect(ctrl, mapping, UVC_CTRL_DATA_CURRENT, > > + &v4l2_rect); > > + xctrl->size = sizeof(v4l2_rect); > > + return copy_to_user(xctrl->p_rect, &v4l2_rect, > > + sizeof(v4l2_rect)); > > + > > + default: > > + xctrl->value = __uvc_ctrl_get_value(mapping, > > uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT)); > > + } > > > > return 0; > > } > > @@ -1104,13 +1183,14 @@ 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); > > + struct v4l2_ext_control xctrl; > > + int ret = > > + __uvc_ctrl_get(chain, master_ctrl, master_map, &xctrl); > > if (ret < 0) > > return ret; > > > > - if (val != mapping->master_manual) > > - v4l2_ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE; > > + if (xctrl.value != mapping->master_manual) > > + v4l2_ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE; > > } > > > > if (!ctrl->cached) { > > @@ -1344,16 +1424,16 @@ static void uvc_ctrl_send_slave_event(struct uvc_video_chain *chain, > > struct uvc_control_mapping *mapping = NULL; > > struct uvc_control *ctrl = NULL; > > u32 changes = V4L2_EVENT_CTRL_CH_FLAGS; > > - s32 val = 0; > > + struct v4l2_ext_control xctrl; > > > > __uvc_find_control(master->entity, slave_id, &mapping, &ctrl, 0); > > if (ctrl == NULL) > > return; > > > > - if (__uvc_ctrl_get(chain, ctrl, mapping, &val) == 0) > > + if (__uvc_ctrl_get(chain, ctrl, mapping, &xctrl) == 0) > > changes |= V4L2_EVENT_CTRL_CH_VALUE; > > > > - uvc_ctrl_send_event(chain, handle, ctrl, mapping, val, changes); > > + uvc_ctrl_send_event(chain, handle, ctrl, mapping, xctrl.value, changes); > > } > > > > void uvc_ctrl_status_event(struct uvc_video_chain *chain, > > @@ -1515,13 +1595,13 @@ static int uvc_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems) > > if (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL) { > > struct v4l2_event ev; > > u32 changes = V4L2_EVENT_CTRL_CH_FLAGS; > > - s32 val = 0; > > + struct v4l2_ext_control xctrl; > > > > - if (__uvc_ctrl_get(handle->chain, ctrl, mapping, &val) == 0) > > + if (__uvc_ctrl_get(handle->chain, ctrl, mapping, &xctrl) == 0) > > changes |= V4L2_EVENT_CTRL_CH_VALUE; > > > > - uvc_ctrl_fill_event(handle->chain, &ev, ctrl, mapping, val, > > - changes); > > + uvc_ctrl_fill_event(handle->chain, &ev, ctrl, mapping, > > + xctrl.value, changes); > > /* Mark the queue as active, allowing this initial > > event to be accepted. */ > > sev->elems = elems; > > @@ -1682,10 +1762,14 @@ int __uvc_ctrl_commit(struct uvc_fh *handle, int rollback, > > } > > > > Please move this change to the other patch I'm not sure we can do that. Before this patch, uvc_ctrl_get only handled CUR, DEF was handled by uvc_query_v4l2_ctrl. Now I changed to uvc_ctrl_get to handle CUR and DEF (+ MIN and MAX in 4/5). This way it's easier because we can't pass ptr controls easily in a v4l2_queryctrl. We add v4l2_which as a parameter here to support V4L2_CTRL_WHICH_DEF_VAL. > > int uvc_ctrl_get(struct uvc_video_chain *chain, > > - struct v4l2_ext_control *xctrl) > > + struct v4l2_ext_control *xctrl, u32 v4l2_which) > > { > > struct uvc_control *ctrl; > > struct uvc_control_mapping *mapping; > > + int ret; > > + u32 flag; > > + u32 id; > > + u8 query; > > > > if (__uvc_query_v4l2_class(chain, xctrl->id, 0) >= 0) > > return -EACCES; > > @@ -1694,7 +1778,36 @@ int uvc_ctrl_get(struct uvc_video_chain *chain, > > if (ctrl == NULL) > > return -EINVAL; > > > > - return __uvc_ctrl_get(chain, ctrl, mapping, &xctrl->value); > > + switch (v4l2_which) { > > + case V4L2_CTRL_WHICH_DEF_VAL: > > + flag = UVC_CTRL_FLAG_GET_DEF; > > + id = UVC_CTRL_DATA_DEF; > > + query = UVC_GET_DEF; > > + break; > > + case V4L2_CTRL_WHICH_CUR_VAL: > > + default: > > + return __uvc_ctrl_get(chain, ctrl, mapping, xctrl); > > + } > > + > > + if (!ctrl->cached) { > > + ret = uvc_ctrl_populate_cache(chain, ctrl); > > + if (ret < 0) > > + return ret; > > + } > > + > > + if (!(ctrl->info.flags & flag)) > > + return -EACCES; > > + > > + if (mapping->v4l2_type == V4L2_CTRL_TYPE_RECT) { > > + struct v4l2_rect rect; > > + > > + __uvc_ctrl_get_v4l2_rect(ctrl, mapping, id, &rect); > > + return copy_to_user(xctrl->p_rect, &rect, sizeof(rect)); > > + } > > + > > + xctrl->value = mapping->get(mapping, query, uvc_ctrl_data(ctrl, id)); > > + > > + return 0; > > } > > > > int uvc_ctrl_set(struct uvc_fh *handle, > > @@ -1703,6 +1816,8 @@ int uvc_ctrl_set(struct uvc_fh *handle, > > struct uvc_video_chain *chain = handle->chain; > > struct uvc_control *ctrl; > > struct uvc_control_mapping *mapping; > > + struct v4l2_rect v4l2_rect; > > + struct uvc_rect uvc_rect; > > s32 value; > > u32 step; > > s32 min; > > @@ -1774,6 +1889,16 @@ int uvc_ctrl_set(struct uvc_fh *handle, > > > > break; > > > > + case V4L2_CTRL_TYPE_RECT: > > + ret = copy_from_user(&v4l2_rect, xctrl->p_rect, > > + sizeof(v4l2_rect)); > > + if (ret < 0) > > + return ret; > > + ret = v4l2_to_uvc_rect(&uvc_rect, &v4l2_rect); > > + if (ret < 0) > > + return ret; > > + break; > > + > > default: > > value = xctrl->value; > > break; > > @@ -1807,8 +1932,16 @@ int uvc_ctrl_set(struct uvc_fh *handle, > > ctrl->info.size); > > } > > > > - mapping->set(mapping, value, > > - uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT)); > > + switch (mapping->data_type) { > > + case UVC_CTRL_DATA_TYPE_RECT: > > + memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT) > > + + mapping->offset / 8, > > + &uvc_rect, sizeof(uvc_rect)); > > + break; > > + default: > > + mapping->set(mapping, value, > > + uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT)); > > + } > > > > if (ctrl->info.flags & UVC_CTRL_FLAG_ASYNCHRONOUS) > > ctrl->handle = handle; > > @@ -2366,6 +2499,40 @@ static void uvc_ctrl_prune_entity(struct uvc_device *dev, > > } > > } > > > > +static int uvc_ctrl_init_roi(struct uvc_device *dev, struct uvc_control *ctrl) > > +{ > > + int ret; > > + > > + ret = uvc_query_ctrl(dev, UVC_GET_DEF, ctrl->entity->id, dev->intfnum, > > + UVC_CT_REGION_OF_INTEREST_CONTROL, > > + uvc_ctrl_data(ctrl, UVC_CTRL_DATA_DEF), > > + ctrl->info.size); > > + if (ret) > > + goto out; > > + > > + /* > > + * Most firmwares have wrong GET_CURRENT configuration. E.g. it's > > + * below GET_MIN, or have rectangle coordinates mixed up. This > > + * causes problems sometimes, because we are unable to set > > + * auto-controls value without first setting ROI rectangle to > > + * valid configuration. > > + * > > + * We expect that default configuration is always correct and > > + * is within the GET_MIN / GET_MAX boundaries. > > + * > > + * Set current ROI configuration to GET_DEF, so that we will > > + * always have properly configured ROI. > > + */ > > + ret = uvc_query_ctrl(dev, UVC_SET_CUR, 1, dev->intfnum, > > + UVC_CT_REGION_OF_INTEREST_CONTROL, > > + uvc_ctrl_data(ctrl, UVC_CTRL_DATA_DEF), > > + ctrl->info.size); > > +out: > > + if (ret) > > + dev_err(&dev->udev->dev, "Failed to fixup ROI (%d).\n", ret); > > + return ret; > > +} > > + > > /* > > * Add control information and hardcoded stock control mappings to the given > > * device. > > @@ -2378,6 +2545,7 @@ static void uvc_ctrl_init_ctrl(struct uvc_video_chain *chain, > > const struct uvc_control_mapping *mapping = uvc_ctrl_mappings; > > const struct uvc_control_mapping *mend = > > mapping + ARRAY_SIZE(uvc_ctrl_mappings); > > + const u8 camera_entity[16] = UVC_GUID_UVC_CAMERA; > > > > /* XU controls initialization requires querying the device for control > > * information. As some buggy UVC devices will crash when queried > > @@ -2398,6 +2566,11 @@ static void uvc_ctrl_init_ctrl(struct uvc_video_chain *chain, > > * GET_INFO on standard controls. > > */ > > uvc_ctrl_get_flags(chain->dev, ctrl, &ctrl->info); > > + > > + if (ctrl->info.selector == > > + UVC_CT_REGION_OF_INTEREST_CONTROL && > > + uvc_entity_match_guid(ctrl->entity, camera_entity)) > > + uvc_ctrl_init_roi(chain->dev, ctrl); > > break; > > } > > } > > diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c > > index 711556d13d03..040511da1005 100644 > > --- a/drivers/media/usb/uvc/uvc_v4l2.c > > +++ b/drivers/media/usb/uvc/uvc_v4l2.c > > @@ -1040,15 +1040,11 @@ static int uvc_ioctl_g_ext_ctrls(struct file *file, void *fh, > > > > if (ctrls->which == V4L2_CTRL_WHICH_DEF_VAL) { > > for (i = 0; i < ctrls->count; ++ctrl, ++i) { > > - struct v4l2_queryctrl qc = { .id = ctrl->id }; > > - > > - ret = uvc_query_v4l2_ctrl(chain, &qc); > > + ret = uvc_ctrl_get(chain, ctrl, ctrls->which); > > if (ret < 0) { > > ctrls->error_idx = i; > > return ret; > > } > > - > > - ctrl->value = qc.default_value; > > } > > > > return 0; > > @@ -1059,7 +1055,7 @@ static int uvc_ioctl_g_ext_ctrls(struct file *file, void *fh, > > return ret; > > > > for (i = 0; i < ctrls->count; ++ctrl, ++i) { > > - ret = uvc_ctrl_get(chain, ctrl); > > + ret = uvc_ctrl_get(chain, ctrl, ctrls->which); > > if (ret < 0) { > > uvc_ctrl_rollback(handle); > > ctrls->error_idx = i; > > diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h > > index 143230b3275b..f414ad7d57b2 100644 > > --- a/drivers/media/usb/uvc/uvcvideo.h > > +++ b/drivers/media/usb/uvc/uvcvideo.h > > @@ -424,6 +424,13 @@ struct uvc_streaming_header { > > u8 bTriggerUsage; > > }; > > > > +struct uvc_rect { > > + u16 top; > > + u16 left; > > + u16 bottom; > > + u16 right; > > +} __packed; > > + > > enum uvc_buffer_state { > > UVC_BUF_STATE_IDLE = 0, > > UVC_BUF_STATE_QUEUED = 1, > > @@ -897,7 +904,8 @@ static inline int uvc_ctrl_rollback(struct uvc_fh *handle) > > return __uvc_ctrl_commit(handle, 1, NULL); > > } > > > > -int uvc_ctrl_get(struct uvc_video_chain *chain, struct v4l2_ext_control *xctrl); > > +int uvc_ctrl_get(struct uvc_video_chain *chain, struct v4l2_ext_control *xctrl, > > + u32 v4l2_which); > > int uvc_ctrl_set(struct uvc_fh *handle, struct v4l2_ext_control *xctrl); > > int uvc_ctrl_is_accessible(struct uvc_video_chain *chain, u32 v4l2_id, > > bool read); > > diff --git a/include/uapi/linux/usb/video.h b/include/uapi/linux/usb/video.h > > index bfdae12cdacf..9076a444758a 100644 > > --- a/include/uapi/linux/usb/video.h > > +++ b/include/uapi/linux/usb/video.h > > @@ -104,6 +104,7 @@ > > #define UVC_CT_ROLL_ABSOLUTE_CONTROL 0x0f > > #define UVC_CT_ROLL_RELATIVE_CONTROL 0x10 > > #define UVC_CT_PRIVACY_CONTROL 0x11 > > +#define UVC_CT_REGION_OF_INTEREST_CONTROL 0x14 > > > > /* A.9.5. Processing Unit Control Selectors */ > > #define UVC_PU_CONTROL_UNDEFINED 0x00 > > diff --git a/include/uapi/linux/uvcvideo.h b/include/uapi/linux/uvcvideo.h > > index 8288137387c0..b16e5d373f3f 100644 > > --- a/include/uapi/linux/uvcvideo.h > > +++ b/include/uapi/linux/uvcvideo.h > > @@ -16,6 +16,7 @@ > > #define UVC_CTRL_DATA_TYPE_BOOLEAN 3 > > #define UVC_CTRL_DATA_TYPE_ENUM 4 > > #define UVC_CTRL_DATA_TYPE_BITMASK 5 > > +#define UVC_CTRL_DATA_TYPE_RECT 6 > > > > /* Control flags */ > > #define UVC_CTRL_FLAG_SET_CUR (1 << 0) > > @@ -36,6 +37,18 @@ > > UVC_CTRL_FLAG_GET_MAX | UVC_CTRL_FLAG_GET_RES | \ > > UVC_CTRL_FLAG_GET_DEF) > > > > +/* V4L2 private controls */ > > +#define V4L2_CID_UVC_REGION_OF_INTEREST_RECT (V4L2_CID_CAMERA_UVC_BASE+1) > > +#define V4L2_CID_UVC_REGION_OF_INTEREST_AUTO (V4L2_CID_CAMERA_UVC_BASE+2) > > +#define V4L2_UVC_REGION_OF_INTEREST_AUTO_EXPOSURE (1 << 0) > > +#define V4L2_UVC_REGION_OF_INTEREST_AUTO_IRIS (1 << 1) > > +#define V4L2_UVC_REGION_OF_INTEREST_AUTO_WHITE_BALANCE (1 << 2) > > +#define V4L2_UVC_REGION_OF_INTEREST_AUTO_FOCUS (1 << 3) > > +#define V4L2_UVC_REGION_OF_INTEREST_AUTO_FACE_DETECT (1 << 4) > > +#define V4L2_UVC_REGION_OF_INTEREST_AUTO_DETECT_AND_TRACK (1 << 5) > > +#define V4L2_UVC_REGION_OF_INTEREST_AUTO_IMAGE_STABILIZATION (1 << 6) > > +#define V4L2_UVC_REGION_OF_INTEREST_AUTO_HIGHER_QUALITY (1 << 7) > > + > > struct uvc_menu_info { > > __u32 value; > > __u8 name[32]; > > diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h > > index bb40129446d4..48d12782e7e4 100644 > > --- a/include/uapi/linux/v4l2-controls.h > > +++ b/include/uapi/linux/v4l2-controls.h > > @@ -1008,6 +1008,14 @@ enum v4l2_auto_focus_range { > > > > #define V4L2_CID_CAMERA_SENSOR_ROTATION (V4L2_CID_CAMERA_CLASS_BASE+35) > > > > +/* CAMERA-class private control IDs */ > > + > > +/* > > + * The base for the uvc driver controls. See linux/uvcvideo.h for the list > > + * of controls. We reserve 16 controls for this driver. > > + */ > > +#define V4L2_CID_CAMERA_UVC_BASE (V4L2_CID_CAMERA_CLASS_BASE + 0x1000) > > + > > /* FM Modulator class control IDs */ > > > > #define V4L2_CID_FM_TX_CLASS_BASE (V4L2_CTRL_CLASS_FM_TX | 0x900) > > -- > > 2.36.1.124.g0e6072fb45-goog > > > > > -- > Ricardo Ribalda
