Thanks Hans! These make sense. I will address them in the next version. On Wed, Sep 13, 2023 at 6:26 PM Hans Verkuil <hverkuil-cisco@xxxxxxxxx> wrote: > > Hi Yunke, > > Thank you for the reminder! Since this series is for uvc, I tend to forget that > it contains a single patch for the V4L2 core that I need to review. Just email > me a reminder for v13 if you don't see a review after a week. > > On 17/08/2023 09:17, Yunke Cao wrote: > > From: Hans Verkuil <hverkuil-cisco@xxxxxxxxx> > > > > Add the capability of retrieving the min and max values of a > > compound control. > > > > Signed-off-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx> > > Signed-off-by: Yunke Cao <yunkec@xxxxxxxxxx> > > --- > > Changelog since v11: > > - Added a flag V4L2_CTRL_FLAG_HAS_WHICH_MIN_MAX. > > - Modified std_min/max_compound() to be void function. Moved the check of > > whether WHICH_MIN/MAX_VAL into prepare_ext_ctrls(), and return EINVAL. > > - Modified documentations to reflect this change. > > Changelog since v10: > > - No change. > > Changelog since v9: > > - No change. > > Changelog since v8: > > - Return ENODATA when min/max is not implemented. Document this behavior. > > - Created a shared helper function __v4l2_ctrl_type_op_init that takes "which" > > as a parameter. Call it in def, min and max operations. > > Changelog since v7: > > - Document that the definition of the min/max are provided by compound controls > > are defined in control documentation. > > - Return error, instead of zeroed memory for v4l2_ctrl_ptr_create(NULL). > > > > git am from https://lore.kernel.org/all/20191119113457.57833-3-hverkuil-cisco@xxxxxxxxx/ > > - Fixed some merge conflits. > > - Fixed the build error in drivers/media/platform/qcom/venus. > > > > .../media/v4l/vidioc-g-ext-ctrls.rst | 16 +- > > .../media/v4l/vidioc-queryctrl.rst | 9 +- > > .../media/videodev2.h.rst.exceptions | 3 + > > drivers/media/i2c/imx214.c | 5 +- > > .../media/platform/qcom/venus/venc_ctrls.c | 9 +- > > drivers/media/v4l2-core/v4l2-ctrls-api.c | 54 ++++-- > > drivers/media/v4l2-core/v4l2-ctrls-core.c | 160 +++++++++++++++--- > > drivers/media/v4l2-core/v4l2-ioctl.c | 4 +- > > include/media/v4l2-ctrls.h | 34 +++- > > include/uapi/linux/videodev2.h | 3 + > > 10 files changed, 252 insertions(+), 45 deletions(-) > > > > diff --git a/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst b/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst > > index 7b1001d11f9c..b4bf016411d3 100644 > > --- a/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst > > +++ b/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst > > @@ -330,14 +330,26 @@ still cause this situation. > > - Which value of the control to get/set/try. > > * - :cspan:`2` ``V4L2_CTRL_WHICH_CUR_VAL`` will return the current value of > > the control, ``V4L2_CTRL_WHICH_DEF_VAL`` will return the default > > + value of the control, ``V4L2_CTRL_WHICH_MIN_VAL`` will return the minimum > > + value of the control, ``V4L2_CTRL_WHICH_MAX_VAL`` will return the maximum > > value of the control and ``V4L2_CTRL_WHICH_REQUEST_VAL`` indicates that > > these controls have to be retrieved from a request or tried/set for > > a request. In the latter case the ``request_fd`` field contains the > > This text is getting a bit messy. I propose this instead: > > * - :cspan:`2` ``V4L2_CTRL_WHICH_CUR_VAL`` will return the current value of > the control, ``V4L2_CTRL_WHICH_DEF_VAL`` will return the default > value of the control, ``V4L2_CTRL_WHICH_MIN_VAL`` will return the minimum > value of the control, and ``V4L2_CTRL_WHICH_MAX_VAL`` will return the maximum > value of the control. ``V4L2_CTRL_WHICH_REQUEST_VAL`` indicates that > the control value has to be retrieved from a request or tried/set for > a request. In that case the ``request_fd`` field contains the > > It's just a few minor changes, but it makes it easier to read. > > > file descriptor of the request that should be used. If the device > > does not support requests, then ``EACCES`` will be returned. > > > > - When using ``V4L2_CTRL_WHICH_DEF_VAL`` be aware that you can only > > - get the default value of the control, you cannot set or try it. > > + When using ``V4L2_CTRL_WHICH_DEF_VAL``, ``V4L2_CTRL_WHICH_MIN_VAL`` > > + or ``V4L2_CTRL_WHICH_MAX_VAL`` be aware that you can only get the > > + default/minimum/maximum value of the control, you cannot set or try it. > > + > > + Whether a control supports querying the minimum and maximum values using > > + ``V4L2_CTRL_WHICH_MIN_VAL`` and ``V4L2_CTRL_WHICH_MAX_VAL`` is indicated > > + by the ``V4L2_CTRL_FLAG_HAS_WHICH_MIN_MAX`` flag. Most non-compound > > + control types support this. For controls with compound types, the > > + definition of minimum/maximum values are provided by > > + the control documentation. If a compound control does not document the > > + meaning of minimum/maximum value, then querying the minimum or maximum > > + value will result in the error code -EINVAL. > > > > For backwards compatibility you can also use a control class here > > (see :ref:`ctrl-class`). In that case all controls have to > > diff --git a/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst b/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst > > index 56d5c8b0b88b..b39f7e27bbbe 100644 > > --- a/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst > > +++ b/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst > > @@ -447,7 +447,10 @@ See also the examples in :ref:`control`. > > - n/a > > - A struct :c:type:`v4l2_rect`, containing a rectangle described by > > the position of its top-left corner, the width and the height. Units > > - depend on the use case. > > + depend on the use case. Support for ``V4L2_CTRL_WHICH_MIN_VAL`` and > > + ``V4L2_CTRL_WHICH_MAX_VAL`` is optional and depends on the > > + ``V4L2_CTRL_FLAG_HAS_WHICH_MIN_MAX`` flag. See the documentation of > > + the specific control on how to interpret the minimum and maximum values. > > * - ``V4L2_CTRL_TYPE_H264_SPS`` > > - n/a > > - n/a > > @@ -664,6 +667,10 @@ See also the examples in :ref:`control`. > > ``dims[0]``. So setting the control with a differently sized > > array will change the ``elems`` field when the control is > > queried afterwards. > > + * - ``V4L2_CTRL_FLAG_HAS_WHICH_MIN_MAX`` > > + - 0x1000 > > + - This control supports getting minimum and maximum values using > > + vidioc_g_ext_ctrls with V4L2_CTRL_WHICH_MIN/MAX_VAL. > > > > Return Value > > ============ > > diff --git a/Documentation/userspace-api/media/videodev2.h.rst.exceptions b/Documentation/userspace-api/media/videodev2.h.rst.exceptions > > index c46082ef0e4d..a417af25e9a4 100644 > > --- a/Documentation/userspace-api/media/videodev2.h.rst.exceptions > > +++ b/Documentation/userspace-api/media/videodev2.h.rst.exceptions > > @@ -393,6 +393,7 @@ replace define V4L2_CTRL_FLAG_HAS_PAYLOAD control-flags > > replace define V4L2_CTRL_FLAG_EXECUTE_ON_WRITE control-flags > > replace define V4L2_CTRL_FLAG_MODIFY_LAYOUT control-flags > > replace define V4L2_CTRL_FLAG_DYNAMIC_ARRAY control-flags > > +replace define V4L2_CTRL_FLAG_HAS_WHICH_MIN_MAX control-flags > > > > replace define V4L2_CTRL_FLAG_NEXT_CTRL control > > replace define V4L2_CTRL_FLAG_NEXT_COMPOUND control > > @@ -567,6 +568,8 @@ ignore define V4L2_CTRL_DRIVER_PRIV > > ignore define V4L2_CTRL_MAX_DIMS > > ignore define V4L2_CTRL_WHICH_CUR_VAL > > ignore define V4L2_CTRL_WHICH_DEF_VAL > > +ignore define V4L2_CTRL_WHICH_MIN_VAL > > +ignore define V4L2_CTRL_WHICH_MAX_VAL > > ignore define V4L2_CTRL_WHICH_REQUEST_VAL > > ignore define V4L2_OUT_CAP_CUSTOM_TIMINGS > > ignore define V4L2_CID_MAX_CTRLS > > diff --git a/drivers/media/i2c/imx214.c b/drivers/media/i2c/imx214.c > > index 2f9c8582f940..8db4a5eb1737 100644 > > --- a/drivers/media/i2c/imx214.c > > +++ b/drivers/media/i2c/imx214.c > > @@ -1037,7 +1037,10 @@ static int imx214_probe(struct i2c_client *client) > > imx214->unit_size = v4l2_ctrl_new_std_compound(&imx214->ctrls, > > NULL, > > V4L2_CID_UNIT_CELL_SIZE, > > - v4l2_ctrl_ptr_create((void *)&unit_size)); > > + v4l2_ctrl_ptr_create((void *)&unit_size), > > + v4l2_ctrl_ptr_create(NULL), > > + v4l2_ctrl_ptr_create(NULL)); > > + > > ret = imx214->ctrls.error; > > if (ret) { > > dev_err(&client->dev, "%s control init failed (%d)\n", > > diff --git a/drivers/media/platform/qcom/venus/venc_ctrls.c b/drivers/media/platform/qcom/venus/venc_ctrls.c > > index 7468e43800a9..28eca8f9d148 100644 > > --- a/drivers/media/platform/qcom/venus/venc_ctrls.c > > +++ b/drivers/media/platform/qcom/venus/venc_ctrls.c > > @@ -607,11 +607,16 @@ int venc_ctrl_init(struct venus_inst *inst) > > > > v4l2_ctrl_new_std_compound(&inst->ctrl_handler, &venc_ctrl_ops, > > V4L2_CID_COLORIMETRY_HDR10_CLL_INFO, > > - v4l2_ctrl_ptr_create(&p_hdr10_cll)); > > + v4l2_ctrl_ptr_create(&p_hdr10_cll), > > + v4l2_ctrl_ptr_create(NULL), > > + v4l2_ctrl_ptr_create(NULL)); > > > > v4l2_ctrl_new_std_compound(&inst->ctrl_handler, &venc_ctrl_ops, > > V4L2_CID_COLORIMETRY_HDR10_MASTERING_DISPLAY, > > - v4l2_ctrl_ptr_create((void *)&p_hdr10_mastering)); > > + v4l2_ctrl_ptr_create((void *)&p_hdr10_mastering), > > + v4l2_ctrl_ptr_create(NULL), > > + v4l2_ctrl_ptr_create(NULL)); > > + > > > > v4l2_ctrl_new_std_menu(&inst->ctrl_handler, &venc_ctrl_ops, > > V4L2_CID_MPEG_VIDEO_INTRA_REFRESH_PERIOD_TYPE, > > diff --git a/drivers/media/v4l2-core/v4l2-ctrls-api.c b/drivers/media/v4l2-core/v4l2-ctrls-api.c > > index 002ea6588edf..d022e1ed4835 100644 > > --- a/drivers/media/v4l2-core/v4l2-ctrls-api.c > > +++ b/drivers/media/v4l2-core/v4l2-ctrls-api.c > > @@ -94,6 +94,22 @@ static int def_to_user(struct v4l2_ext_control *c, struct v4l2_ctrl *ctrl) > > return ptr_to_user(c, ctrl, ctrl->p_new); > > } > > > > +/* Helper function: copy the minimum control value back to the caller */ > > +static int min_to_user(struct v4l2_ext_control *c, struct v4l2_ctrl *ctrl) > > +{ > > + ctrl->type_ops->minimum(ctrl, 0, ctrl->p_new); > > + > > + return ptr_to_user(c, ctrl, ctrl->p_new); > > +} > > + > > +/* Helper function: copy the maximum control value back to the caller */ > > +static int max_to_user(struct v4l2_ext_control *c, struct v4l2_ctrl *ctrl) > > +{ > > + ctrl->type_ops->maximum(ctrl, 0, ctrl->p_new); > > + > > + return ptr_to_user(c, ctrl, ctrl->p_new); > > +} > > + > > /* Helper function: copy the caller-provider value as the new control value */ > > static int user_to_new(struct v4l2_ext_control *c, struct v4l2_ctrl *ctrl) > > { > > @@ -229,8 +245,8 @@ static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl, > > cs->error_idx = i; > > > > if (cs->which && > > - cs->which != V4L2_CTRL_WHICH_DEF_VAL && > > - cs->which != V4L2_CTRL_WHICH_REQUEST_VAL && > > + (cs->which < V4L2_CTRL_WHICH_DEF_VAL || > > + cs->which > V4L2_CTRL_WHICH_MAX_VAL) && > > V4L2_CTRL_ID2WHICH(id) != cs->which) { > > dprintk(vdev, > > "invalid which 0x%x or control id 0x%x\n", > > @@ -259,6 +275,15 @@ static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl, > > return -EINVAL; > > } > > > > + if (!(ctrl->flags & V4L2_CTRL_FLAG_HAS_WHICH_MIN_MAX) && > > + (cs->which == V4L2_CTRL_WHICH_MIN_VAL || > > + cs->which == V4L2_CTRL_WHICH_MAX_VAL)) { > > + dprintk(vdev, > > + "invalid which 0x%x or control id 0x%x\n", > > + cs->which, id); > > + return -EINVAL; > > + } > > + > > if (ctrl->cluster[0]->ncontrols > 1) > > have_clusters = true; > > if (ctrl->cluster[0] != ctrl) > > @@ -368,8 +393,8 @@ static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl, > > */ > > static int class_check(struct v4l2_ctrl_handler *hdl, u32 which) > > { > > - if (which == 0 || which == V4L2_CTRL_WHICH_DEF_VAL || > > - which == V4L2_CTRL_WHICH_REQUEST_VAL) > > + if (which == 0 || (which >= V4L2_CTRL_WHICH_DEF_VAL && > > + which <= V4L2_CTRL_WHICH_MAX_VAL)) > > return 0; > > return find_ref_lock(hdl, which | 1) ? 0 : -EINVAL; > > } > > @@ -389,10 +414,12 @@ int v4l2_g_ext_ctrls_common(struct v4l2_ctrl_handler *hdl, > > struct v4l2_ctrl_helper *helpers = helper; > > int ret; > > int i, j; > > - bool is_default, is_request; > > + bool is_default, is_request, is_min, is_max; > > > > is_default = (cs->which == V4L2_CTRL_WHICH_DEF_VAL); > > is_request = (cs->which == V4L2_CTRL_WHICH_REQUEST_VAL); > > + is_min = (cs->which == V4L2_CTRL_WHICH_MIN_VAL); > > + is_max = (cs->which == V4L2_CTRL_WHICH_MAX_VAL); > > > > cs->error_idx = cs->count; > > cs->which = V4L2_CTRL_ID2WHICH(cs->which); > > @@ -432,13 +459,14 @@ int v4l2_g_ext_ctrls_common(struct v4l2_ctrl_handler *hdl, > > > > /* > > * g_volatile_ctrl will update the new control values. > > - * This makes no sense for V4L2_CTRL_WHICH_DEF_VAL and > > + * This makes no sense for V4L2_CTRL_WHICH_DEF_VAL, > > + * V4L2_CTRL_WHICH_MIN_VAL, V4L2_CTRL_WHICH_MAX_VAL and > > * V4L2_CTRL_WHICH_REQUEST_VAL. In the case of requests > > * it is v4l2_ctrl_request_complete() that copies the > > * volatile controls at the time of request completion > > * to the request, so you don't want to do that again. > > */ > > - if (!is_default && !is_request && > > + if (!is_default && !is_request && !is_min && !is_max && > > ((master->flags & V4L2_CTRL_FLAG_VOLATILE) || > > (master->has_volatiles && !is_cur_manual(master)))) { > > for (j = 0; j < master->ncontrols; j++) > > @@ -467,6 +495,10 @@ int v4l2_g_ext_ctrls_common(struct v4l2_ctrl_handler *hdl, > > ret = -ENOMEM; > > else if (is_request && ref->p_req_valid) > > ret = req_to_user(cs->controls + idx, ref); > > + else if (is_min) > > + ret = min_to_user(cs->controls + idx, ref->ctrl); > > + else if (is_max) > > + ret = max_to_user(cs->controls + idx, ref->ctrl); > > else if (is_volatile) > > ret = new_to_user(cs->controls + idx, ref->ctrl); > > else > > @@ -564,9 +596,11 @@ int try_set_ext_ctrls_common(struct v4l2_fh *fh, > > > > cs->error_idx = cs->count; > > > > - /* Default value cannot be changed */ > > - if (cs->which == V4L2_CTRL_WHICH_DEF_VAL) { > > - dprintk(vdev, "%s: cannot change default value\n", > > + /* Default/minimum/maximum values cannot be changed */ > > + if (cs->which == V4L2_CTRL_WHICH_DEF_VAL || > > + cs->which == V4L2_CTRL_WHICH_MIN_VAL || > > + cs->which == V4L2_CTRL_WHICH_MAX_VAL) { > > + dprintk(vdev, "%s: cannot change default/min/max value\n", > > video_device_node_name(vdev)); > > return -EINVAL; > > } > > diff --git a/drivers/media/v4l2-core/v4l2-ctrls-core.c b/drivers/media/v4l2-core/v4l2-ctrls-core.c > > index f1486ab032cf..f36d54810dbc 100644 > > --- a/drivers/media/v4l2-core/v4l2-ctrls-core.c > > +++ b/drivers/media/v4l2-core/v4l2-ctrls-core.c > > @@ -182,29 +182,69 @@ static void std_init_compound(const struct v4l2_ctrl *ctrl, u32 idx, > > } > > } > > > > -void v4l2_ctrl_type_op_init(const struct v4l2_ctrl *ctrl, u32 from_idx, > > +static void std_min_compound(const struct v4l2_ctrl *ctrl, u32 idx, > > + union v4l2_ctrl_ptr ptr) > > +{ > > + void *p = ptr.p + idx * ctrl->elem_size; > > + > > + if (ctrl->p_min.p_const) > > + memcpy(p, ctrl->p_min.p_const, ctrl->elem_size); > > + else > > + memset(p, 0, ctrl->elem_size); > > +} > > + > > +static void std_max_compound(const struct v4l2_ctrl *ctrl, u32 idx, > > union v4l2_ctrl_ptr ptr) > > +{ > > + void *p = ptr.p + idx * ctrl->elem_size; > > + > > + if (ctrl->p_min.p_const) > > Typo: p_min -> p_max > > > + memcpy(p, ctrl->p_max.p_const, ctrl->elem_size); > > + else > > + memset(p, 0, ctrl->elem_size); > > +} > > + > > +static int __v4l2_ctrl_type_op_init(const struct v4l2_ctrl *ctrl, u32 from_idx, > > Just keep this as a void function. The return value is never used anyway. > > The assumption is that this function is only called with valid arguments. > > > + u32 which, union v4l2_ctrl_ptr ptr) > > { > > unsigned int i; > > u32 tot_elems = ctrl->elems; > > u32 elems = tot_elems - from_idx; > > + s64 value; > > > > if (from_idx >= tot_elems) > > - return; > > + return -EINVAL; > > + > > + switch (which) { > > + case V4L2_CTRL_WHICH_DEF_VAL: > > + value = ctrl->default_value; > > + break; > > + case V4L2_CTRL_WHICH_MAX_VAL: > > + value = ctrl->maximum; > > + break; > > + case V4L2_CTRL_WHICH_MIN_VAL: > > + value = ctrl->minimum; > > + break; > > + default: > > + return -EINVAL; > > + } > > > > switch (ctrl->type) { > > case V4L2_CTRL_TYPE_STRING: > > + if (which == V4L2_CTRL_WHICH_DEF_VAL) > > + value = ctrl->minimum; > > + > > for (i = from_idx; i < tot_elems; i++) { > > unsigned int offset = i * ctrl->elem_size; > > > > - memset(ptr.p_char + offset, ' ', ctrl->minimum); > > - ptr.p_char[offset + ctrl->minimum] = '\0'; > > + memset(ptr.p_char + offset, ' ', value); > > + ptr.p_char[offset + value] = '\0'; > > } > > break; > > case V4L2_CTRL_TYPE_INTEGER64: > > - if (ctrl->default_value) { > > + if (value) { > > for (i = from_idx; i < tot_elems; i++) > > - ptr.p_s64[i] = ctrl->default_value; > > + ptr.p_s64[i] = value; > > } else { > > memset(ptr.p_s64 + from_idx, 0, elems * sizeof(s64)); > > } > > @@ -214,9 +254,9 @@ void v4l2_ctrl_type_op_init(const struct v4l2_ctrl *ctrl, u32 from_idx, > > case V4L2_CTRL_TYPE_MENU: > > case V4L2_CTRL_TYPE_BITMASK: > > case V4L2_CTRL_TYPE_BOOLEAN: > > - if (ctrl->default_value) { > > + if (value) { > > for (i = from_idx; i < tot_elems; i++) > > - ptr.p_s32[i] = ctrl->default_value; > > + ptr.p_s32[i] = value; > > } else { > > memset(ptr.p_s32 + from_idx, 0, elems * sizeof(s32)); > > } > > @@ -226,32 +266,63 @@ void v4l2_ctrl_type_op_init(const struct v4l2_ctrl *ctrl, u32 from_idx, > > memset(ptr.p_s32 + from_idx, 0, elems * sizeof(s32)); > > break; > > case V4L2_CTRL_TYPE_U8: > > - memset(ptr.p_u8 + from_idx, ctrl->default_value, elems); > > + memset(ptr.p_u8 + from_idx, value, elems); > > break; > > case V4L2_CTRL_TYPE_U16: > > - if (ctrl->default_value) { > > + if (value) { > > for (i = from_idx; i < tot_elems; i++) > > - ptr.p_u16[i] = ctrl->default_value; > > + ptr.p_u16[i] = value; > > } else { > > memset(ptr.p_u16 + from_idx, 0, elems * sizeof(u16)); > > } > > break; > > case V4L2_CTRL_TYPE_U32: > > - if (ctrl->default_value) { > > + if (value) { > > for (i = from_idx; i < tot_elems; i++) > > - ptr.p_u32[i] = ctrl->default_value; > > + ptr.p_u32[i] = value; > > } else { > > memset(ptr.p_u32 + from_idx, 0, elems * sizeof(u32)); > > } > > break; > > default: > > - for (i = from_idx; i < tot_elems; i++) > > - std_init_compound(ctrl, i, ptr); > > + for (i = from_idx; i < tot_elems; i++) { > > + switch (which) { > > + case V4L2_CTRL_WHICH_DEF_VAL: > > + std_init_compound(ctrl, i, ptr); > > + break; > > + case V4L2_CTRL_WHICH_MAX_VAL: > > + std_max_compound(ctrl, i, ptr); > > + break; > > + case V4L2_CTRL_WHICH_MIN_VAL: > > + std_min_compound(ctrl, i, ptr); > > + break; > > + } > > + } > > break; > > } > > + > > + return 0; > > +} > > + > > +void v4l2_ctrl_type_op_init(const struct v4l2_ctrl *ctrl, u32 from_idx, > > + union v4l2_ctrl_ptr ptr) > > +{ > > + __v4l2_ctrl_type_op_init(ctrl, from_idx, V4L2_CTRL_WHICH_DEF_VAL, ptr); > > } > > EXPORT_SYMBOL(v4l2_ctrl_type_op_init); > > > > +void v4l2_ctrl_type_op_minimum(const struct v4l2_ctrl *ctrl, u32 from_idx, > > + union v4l2_ctrl_ptr ptr) > > +{ > > + __v4l2_ctrl_type_op_init(ctrl, from_idx, V4L2_CTRL_WHICH_MIN_VAL, ptr); > > +} > > + > > +void v4l2_ctrl_type_op_maximum(const struct v4l2_ctrl *ctrl, u32 from_idx, > > + union v4l2_ctrl_ptr ptr) > > +{ > > + __v4l2_ctrl_type_op_init(ctrl, from_idx, V4L2_CTRL_WHICH_MAX_VAL, ptr); > > +} > > + > > void v4l2_ctrl_type_op_log(const struct v4l2_ctrl *ctrl) > > { > > union v4l2_ctrl_ptr ptr = ctrl->p_cur; > > @@ -1293,6 +1364,8 @@ EXPORT_SYMBOL(v4l2_ctrl_type_op_validate); > > static const struct v4l2_ctrl_type_ops std_type_ops = { > > .equal = v4l2_ctrl_type_op_equal, > > .init = v4l2_ctrl_type_op_init, > > + .minimum = v4l2_ctrl_type_op_minimum, > > + .maximum = v4l2_ctrl_type_op_maximum, > > .log = v4l2_ctrl_type_op_log, > > .validate = v4l2_ctrl_type_op_validate, > > }; > > @@ -1764,7 +1837,10 @@ static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl, > > s64 min, s64 max, u64 step, s64 def, > > const u32 dims[V4L2_CTRL_MAX_DIMS], u32 elem_size, > > u32 flags, const char * const *qmenu, > > - const s64 *qmenu_int, const union v4l2_ctrl_ptr p_def, > > + const s64 *qmenu_int, > > + const union v4l2_ctrl_ptr p_def, > > + const union v4l2_ctrl_ptr p_min, > > + const union v4l2_ctrl_ptr p_max, > > void *priv) > > { > > struct v4l2_ctrl *ctrl; > > @@ -1888,6 +1964,12 @@ static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl, > > break; > > } > > > > + if (type < V4L2_CTRL_COMPOUND_TYPES && > > + type != V4L2_CTRL_TYPE_BUTTON && > > + type != V4L2_CTRL_TYPE_CTRL_CLASS && > > + type != V4L2_CTRL_TYPE_STRING) > > + flags |= V4L2_CTRL_FLAG_HAS_WHICH_MIN_MAX; > > + > > /* Sanity checks */ > > if (id == 0 || name == NULL || !elem_size || > > id >= V4L2_CID_PRIVATE_BASE || > > @@ -1896,6 +1978,21 @@ static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl, > > handler_set_err(hdl, -ERANGE); > > return NULL; > > } > > + > > + if ((!p_def.p_const && p_min.p_const) || > > + (p_min.p_const && !p_max.p_const) || > > + (!p_min.p_const && p_max.p_const)) { > > + handler_set_err(hdl, -EINVAL); > > + return NULL; > > + } > > I would drop this. I think p_def, p_min and p_max can all be NULL (in which > case the corresponding value is a memset(0)). > > > + > > + if (flags & V4L2_CTRL_FLAG_HAS_WHICH_MIN_MAX && > > + type >= V4L2_CTRL_COMPOUND_TYPES && > > + (!p_min.p_const || !p_max.p_const)) { > > + handler_set_err(hdl, -EINVAL); > > + return NULL; > > + } > > Same here. Suppose you have a compound control that for whatever reason has > just a single fixed value, that happens to be all zeroes. Then you can set > leave p_min/p_max to NULL, while still setting V4L2_CTRL_FLAG_HAS_WHICH_MIN_MAX. > > I'd just drop this test. > > > + > > err = check_range(type, min, max, step, def); > > if (err) { > > handler_set_err(hdl, err); > > @@ -1937,6 +2034,8 @@ static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl, > > > > if (type >= V4L2_CTRL_COMPOUND_TYPES && p_def.p_const) > > sz_extra += elem_size; > > + if (type >= V4L2_CTRL_COMPOUND_TYPES && p_min.p_const) > > + sz_extra += elem_size * 2; > > Since one of p_min or p_max can be NULL, just do this: > > if (type >= V4L2_CTRL_COMPOUND_TYPES && p_min.p_const) > sz_extra += elem_size; > if (type >= V4L2_CTRL_COMPOUND_TYPES && p_max.p_const) > sz_extra += elem_size; > > > > > ctrl = kvzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL); > > if (ctrl == NULL) { > > @@ -2002,6 +2101,14 @@ static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl, > > memcpy(ctrl->p_def.p, p_def.p_const, elem_size); > > } > > > > + if (flags & V4L2_CTRL_FLAG_HAS_WHICH_MIN_MAX && > > + p_min.p_const && p_max.p_const) { > > + ctrl->p_min.p = ctrl->p_def.p + elem_size; > > + memcpy(ctrl->p_min.p, p_min.p_const, elem_size); > > + ctrl->p_max.p = ctrl->p_min.p + elem_size; > > + memcpy(ctrl->p_max.p, p_max.p_const, elem_size); > > + } > > This needs a similar modification. > > > + > > ctrl->type_ops->init(ctrl, 0, ctrl->p_cur); > > cur_to_new(ctrl); > > > > @@ -2052,7 +2159,8 @@ struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl, > > type, min, max, > > is_menu ? cfg->menu_skip_mask : step, def, > > cfg->dims, cfg->elem_size, > > - flags, qmenu, qmenu_int, cfg->p_def, priv); > > + flags, qmenu, qmenu_int, cfg->p_def, cfg->p_min, > > + cfg->p_max, priv); > > if (ctrl) > > ctrl->is_private = cfg->is_private; > > return ctrl; > > @@ -2077,7 +2185,8 @@ struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl, > > } > > return v4l2_ctrl_new(hdl, ops, NULL, id, name, type, > > min, max, step, def, NULL, 0, > > - flags, NULL, NULL, ptr_null, NULL); > > + flags, NULL, NULL, ptr_null, ptr_null, > > + ptr_null, NULL); > > } > > EXPORT_SYMBOL(v4l2_ctrl_new_std); > > > > @@ -2110,7 +2219,8 @@ struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl, > > } > > return v4l2_ctrl_new(hdl, ops, NULL, id, name, type, > > 0, max, mask, def, NULL, 0, > > - flags, qmenu, qmenu_int, ptr_null, NULL); > > + flags, qmenu, qmenu_int, ptr_null, ptr_null, > > + ptr_null, NULL); > > } > > EXPORT_SYMBOL(v4l2_ctrl_new_std_menu); > > > > @@ -2142,7 +2252,8 @@ struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl, > > } > > return v4l2_ctrl_new(hdl, ops, NULL, id, name, type, > > 0, max, mask, def, NULL, 0, > > - flags, qmenu, NULL, ptr_null, NULL); > > + flags, qmenu, NULL, ptr_null, ptr_null, > > + ptr_null, NULL); > > > > } > > EXPORT_SYMBOL(v4l2_ctrl_new_std_menu_items); > > @@ -2150,7 +2261,9 @@ EXPORT_SYMBOL(v4l2_ctrl_new_std_menu_items); > > /* Helper function for standard compound controls */ > > struct v4l2_ctrl *v4l2_ctrl_new_std_compound(struct v4l2_ctrl_handler *hdl, > > const struct v4l2_ctrl_ops *ops, u32 id, > > - const union v4l2_ctrl_ptr p_def) > > + const union v4l2_ctrl_ptr p_def, > > + const union v4l2_ctrl_ptr p_min, > > + const union v4l2_ctrl_ptr p_max) > > { > > const char *name; > > enum v4l2_ctrl_type type; > > @@ -2164,7 +2277,7 @@ struct v4l2_ctrl *v4l2_ctrl_new_std_compound(struct v4l2_ctrl_handler *hdl, > > } > > return v4l2_ctrl_new(hdl, ops, NULL, id, name, type, > > min, max, step, def, NULL, 0, > > - flags, NULL, NULL, p_def, NULL); > > + flags, NULL, NULL, p_def, p_min, p_max, NULL); > > } > > EXPORT_SYMBOL(v4l2_ctrl_new_std_compound); > > > > @@ -2188,7 +2301,8 @@ struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl, > > } > > return v4l2_ctrl_new(hdl, ops, NULL, id, name, type, > > 0, max, 0, def, NULL, 0, > > - flags, NULL, qmenu_int, ptr_null, NULL); > > + flags, NULL, qmenu_int, ptr_null, ptr_null, > > + ptr_null, NULL); > > } > > EXPORT_SYMBOL(v4l2_ctrl_new_int_menu); > > > > diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c > > index 01ba27f2ef87..aaf68bfaa601 100644 > > --- a/drivers/media/v4l2-core/v4l2-ioctl.c > > +++ b/drivers/media/v4l2-core/v4l2-ioctl.c > > @@ -884,7 +884,9 @@ static bool check_ext_ctrls(struct v4l2_ext_controls *c, unsigned long ioctl) > > return false; > > break; > > case V4L2_CTRL_WHICH_DEF_VAL: > > - /* Default value cannot be changed */ > > + case V4L2_CTRL_WHICH_MIN_VAL: > > + case V4L2_CTRL_WHICH_MAX_VAL: > > + /* Default, minimum or maximum value cannot be changed */ > > if (ioctl == VIDIOC_S_EXT_CTRLS || > > ioctl == VIDIOC_TRY_EXT_CTRLS) { > > c->error_idx = c->count; > > diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h > > index b0db167a3ac4..6e12493b30d3 100644 > > --- a/include/media/v4l2-ctrls.h > > +++ b/include/media/v4l2-ctrls.h > > @@ -133,6 +133,8 @@ struct v4l2_ctrl_ops { > > * > > * @equal: return true if all ctrl->elems array elements are equal. > > * @init: initialize the value for array elements from from_idx to ctrl->elems. > > + * @minimum: set the value to the minimum value of the control. > > + * @maximum: set the value to the maximum value of the control. > > * @log: log the value. > > * @validate: validate the value for ctrl->new_elems array elements. > > * Return 0 on success and a negative value otherwise. > > @@ -142,6 +144,10 @@ struct v4l2_ctrl_type_ops { > > union v4l2_ctrl_ptr ptr1, union v4l2_ctrl_ptr ptr2); > > void (*init)(const struct v4l2_ctrl *ctrl, u32 from_idx, > > union v4l2_ctrl_ptr ptr); > > + void (*minimum)(const struct v4l2_ctrl *ctrl, u32 idx, > > + union v4l2_ctrl_ptr ptr); > > + void (*maximum)(const struct v4l2_ctrl *ctrl, u32 idx, > > + union v4l2_ctrl_ptr ptr); > > void (*log)(const struct v4l2_ctrl *ctrl); > > int (*validate)(const struct v4l2_ctrl *ctrl, union v4l2_ctrl_ptr ptr); > > }; > > @@ -247,6 +253,12 @@ typedef void (*v4l2_ctrl_notify_fnc)(struct v4l2_ctrl *ctrl, void *priv); > > * @p_def: The control's default value represented via a union which > > * provides a standard way of accessing control types > > * through a pointer (for compound controls only). > > + * @p_min: The control's minimum value represented via a union which > > + * provides a standard way of accessing control types > > + * through a pointer (for compound controls only). > > + * @p_max: The control's maximum value represented via a union which > > + * provides a standard way of accessing control types > > + * through a pointer (for compound controls only). > > * @p_cur: The control's current value represented via a union which > > * provides a standard way of accessing control types > > * through a pointer. > > @@ -306,6 +318,8 @@ struct v4l2_ctrl { > > } cur; > > > > union v4l2_ctrl_ptr p_def; > > + union v4l2_ctrl_ptr p_min; > > + union v4l2_ctrl_ptr p_max; > > union v4l2_ctrl_ptr p_new; > > union v4l2_ctrl_ptr p_cur; > > }; > > @@ -425,6 +439,8 @@ struct v4l2_ctrl_handler { > > * @step: The control's step value for non-menu controls. > > * @def: The control's default value. > > * @p_def: The control's default value for compound controls. > > + * @p_min: The control's minimum value for compound controls. > > + * @p_max: The control's maximum value for compound controls. > > * @dims: The size of each dimension. > > * @elem_size: The size in bytes of the control. > > * @flags: The control's flags. > > @@ -454,6 +470,8 @@ struct v4l2_ctrl_config { > > u64 step; > > s64 def; > > union v4l2_ctrl_ptr p_def; > > + union v4l2_ctrl_ptr p_min; > > + union v4l2_ctrl_ptr p_max; > > u32 dims[V4L2_CTRL_MAX_DIMS]; > > u32 elem_size; > > u32 flags; > > @@ -723,17 +741,23 @@ struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl, > > * @ops: The control ops. > > * @id: The control ID. > > * @p_def: The control's default value. > > + * @p_min: The control's minimum value. > > + * @p_max: The control's maximum value. > > * > > - * Sames as v4l2_ctrl_new_std(), but with support to compound controls, thanks > > - * to the @p_def field. Use v4l2_ctrl_ptr_create() to create @p_def from a > > - * pointer. Use v4l2_ctrl_ptr_create(NULL) if the default value of the > > - * compound control should be all zeroes. > > + * Same as v4l2_ctrl_new_std(), but with support to compound controls, thanks > > + * to the @p_def/min/max fields. Use v4l2_ctrl_ptr_create() to create > > + * @p_def/min/max from a pointer. Use v4l2_ctrl_ptr_create(NULL) if the > > + * default value of the compound control should be all zeroes. Use > > + * v4l2_ctrl_ptr_create(NULL) if the min/max value of the compound control > > + * is not defined, -ENODATA will be returned in this case. > > This is outdated and should be: > > * @p_def/min/max from a pointer. Use v4l2_ctrl_ptr_create(NULL) if the > * default, minimum or maximum value of the compound control should be all zeroes. > > > * > > */ > > struct v4l2_ctrl *v4l2_ctrl_new_std_compound(struct v4l2_ctrl_handler *hdl, > > const struct v4l2_ctrl_ops *ops, > > u32 id, > > - const union v4l2_ctrl_ptr p_def); > > + const union v4l2_ctrl_ptr p_def, > > + const union v4l2_ctrl_ptr p_min, > > + const union v4l2_ctrl_ptr p_max); > > > > /** > > * v4l2_ctrl_new_int_menu() - Create a new standard V4L2 integer menu control. > > diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h > > index 089d553cf736..d7670aaf3b5f 100644 > > --- a/include/uapi/linux/videodev2.h > > +++ b/include/uapi/linux/videodev2.h > > @@ -1863,6 +1863,8 @@ struct v4l2_ext_controls { > > #define V4L2_CTRL_WHICH_CUR_VAL 0 > > #define V4L2_CTRL_WHICH_DEF_VAL 0x0f000000 > > #define V4L2_CTRL_WHICH_REQUEST_VAL 0x0f010000 > > +#define V4L2_CTRL_WHICH_MIN_VAL 0x0f020000 > > +#define V4L2_CTRL_WHICH_MAX_VAL 0x0f030000 > > > > enum v4l2_ctrl_type { > > V4L2_CTRL_TYPE_INTEGER = 1, > > @@ -1970,6 +1972,7 @@ struct v4l2_querymenu { > > #define V4L2_CTRL_FLAG_EXECUTE_ON_WRITE 0x0200 > > #define V4L2_CTRL_FLAG_MODIFY_LAYOUT 0x0400 > > #define V4L2_CTRL_FLAG_DYNAMIC_ARRAY 0x0800 > > +#define V4L2_CTRL_FLAG_HAS_WHICH_MIN_MAX 0x1000 > > > > /* Query flags, to be ORed with the control ID */ > > #define V4L2_CTRL_FLAG_NEXT_CTRL 0x80000000 > > Regards, > > Hans
