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[209.85.166.50]) by smtp.gmail.com with ESMTPSA id v8sm9306781ilg.21.2021.03.16.03.13.09 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 16 Mar 2021 03:13:10 -0700 (PDT) Received: by mail-io1-f50.google.com with SMTP id u20so36469376iot.9 for ; Tue, 16 Mar 2021 03:13:09 -0700 (PDT) X-Received: by 2002:a05:6602:722:: with SMTP id g2mr2734542iox.1.1615889589448; Tue, 16 Mar 2021 03:13:09 -0700 (PDT) MIME-Version: 1.0 References: <20210315173609.1547857-1-ribalda@chromium.org> <20210315173609.1547857-7-ribalda@chromium.org> <59c2f8dd-db7d-f80c-88fe-0db00c15c741@xs4all.nl> In-Reply-To: From: Ricardo Ribalda Date: Tue, 16 Mar 2021 11:12:57 +0100 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH v4 06/11] media: uvcvideo: Add support for V4L2_CTRL_TYPE_CTRL_CLASS To: Laurent Pinchart Cc: Hans Verkuil , Mauro Carvalho Chehab , Sergey Senozhatsky , Linux Media Mailing List , Linux Kernel Mailing List Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Laurent On Tue, Mar 16, 2021 at 11:08 AM Laurent Pinchart wrote: > > Hi Hans, > > On Tue, Mar 16, 2021 at 09:37:07AM +0100, Hans Verkuil wrote: > > On 15/03/2021 18:36, Ricardo Ribalda wrote: > > > Create all the class controls for the device defined controls. > > > > > > Fixes v4l2-compliance: > > > Control ioctls (Input 0): > > > fail: v4l2-test-controls.cpp(216): missing control class for class 00980000 > > > fail: v4l2-test-controls.cpp(216): missing control tclass for class 009a0000 > > > test VIDIOC_QUERY_EXT_CTRL/QUERYMENU: FAIL > > > > > > Signed-off-by: Ricardo Ribalda > > > --- > > > drivers/media/usb/uvc/uvc_ctrl.c | 96 ++++++++++++++++++++++++++++++++ > > > drivers/media/usb/uvc/uvcvideo.h | 6 ++ > > > 2 files changed, 102 insertions(+) > > > > > > diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c > > > index b75da65115ef..be0fadaf414c 100644 > > > --- a/drivers/media/usb/uvc/uvc_ctrl.c > > > +++ b/drivers/media/usb/uvc/uvc_ctrl.c > > > @@ -357,6 +357,17 @@ static const struct uvc_control_info uvc_ctrls[] = { > > > }, > > > }; > > > > > > +static const struct uvc_control_class uvc_control_class[] = { > > > + { > > > + .id = V4L2_CID_CAMERA_CLASS, > > > + .name = "Camera Controls", > > > + }, > > > + { > > > + .id = V4L2_CID_USER_CLASS, > > > + .name = "User Controls", > > > > I noticed that uvc_ctrl.c has hardcoded strings for the control names and > > control menus. > > > > It would be good to drop that from the code and instead use v4l2_ctrl_get_menu() > > and v4l2_ctrl_get_name() to obtain the names. It ensures consistent naming and > > saves a bit of memory. > > > > This can be done in a separate patch before or after this one. > > https://git.linuxtv.org/pinchartl/media.git/commit/?h=uvc/dev&id=16a7d79d67cdd06a448d8c4c20e270d1c21828b1 > > It's work in progress, the part that bothers me is the changes in > uvc_parse_format(). We lose the human-readable name in a debug message, > but maybe more importantly, we lose the distinction between different DV > formats. Maybe it's not a big deal. That patch is for format descriptions. If you haven't started yet I can implement the change for the control names. Thanks! > > > > + }, > > > +}; > > > + > > > static const struct uvc_menu_info power_line_frequency_controls[] = { > > > { 0, "Disabled" }, > > > { 1, "50 Hz" }, > > > @@ -1024,6 +1035,49 @@ static int __uvc_ctrl_get(struct uvc_video_chain *chain, > > > return 0; > > > } > > > > > > +static int __uvc_query_v4l2_class(struct uvc_video_chain *chain, u32 req_id, > > > + u32 found_id) > > > +{ > > > + bool find_next = req_id & V4L2_CTRL_FLAG_NEXT_CTRL; > > > + unsigned int i; > > > + > > > + req_id &= V4L2_CTRL_ID_MASK; > > > + > > > + for (i = 0; i < ARRAY_SIZE(uvc_control_class); i++) { > > > + if (!(chain->ctrl_class_bitmap & BIT(i))) > > > + continue; > > > + if (!find_next) { > > > + if (uvc_control_class[i].id == req_id) > > > + return i; > > > + continue; > > > + } > > > + if (uvc_control_class[i].id > req_id && > > > + uvc_control_class[i].id < found_id) > > > + return i; > > > + } > > > + > > > + return -ENODEV; > > > +} > > > + > > > +static int uvc_query_v4l2_class(struct uvc_video_chain *chain, u32 req_id, > > > + u32 found_id, struct v4l2_queryctrl *v4l2_ctrl) > > > +{ > > > + int idx; > > > + > > > + idx = __uvc_query_v4l2_class(chain, req_id, found_id); > > > + if (idx < 0) > > > + return -ENODEV; > > > + > > > + memset(v4l2_ctrl, 0, sizeof(*v4l2_ctrl)); > > > + v4l2_ctrl->id = uvc_control_class[idx].id; > > > + strscpy(v4l2_ctrl->name, uvc_control_class[idx].name, > > > + sizeof(v4l2_ctrl->name)); > > > + v4l2_ctrl->type = V4L2_CTRL_TYPE_CTRL_CLASS; > > > + v4l2_ctrl->flags = V4L2_CTRL_FLAG_WRITE_ONLY > > > + | V4L2_CTRL_FLAG_READ_ONLY; > > > + return 0; > > > +} > > > + > > > static int __uvc_query_v4l2_ctrl(struct uvc_video_chain *chain, > > > struct uvc_control *ctrl, > > > struct uvc_control_mapping *mapping, > > > @@ -1127,12 +1181,31 @@ int uvc_query_v4l2_ctrl(struct uvc_video_chain *chain, > > > if (ret < 0) > > > return -ERESTARTSYS; > > > > > > + /* Check if the ctrl is a know class */ > > > + if (!(v4l2_ctrl->id & V4L2_CTRL_FLAG_NEXT_CTRL)) { > > > + ret = uvc_query_v4l2_class(chain, v4l2_ctrl->id, 0, v4l2_ctrl); > > > + if (!ret) > > > + goto done; > > > + } > > > + > > > ctrl = uvc_find_control(chain, v4l2_ctrl->id, &mapping); > > > if (ctrl == NULL) { > > > ret = -EINVAL; > > > goto done; > > > } > > > > > > + /* > > > + * If we're enumerating control with V4L2_CTRL_FLAG_NEXT_CTRL, check if > > > + * a class should be inserted between the previous control and the one > > > + * we have just found. > > > + */ > > > + if (v4l2_ctrl->id & V4L2_CTRL_FLAG_NEXT_CTRL) { > > > + ret = uvc_query_v4l2_class(chain, v4l2_ctrl->id, mapping->id, > > > + v4l2_ctrl); > > > + if (!ret) > > > + goto done; > > > + } > > > + > > > ret = __uvc_query_v4l2_ctrl(chain, ctrl, mapping, v4l2_ctrl); > > > done: > > > mutex_unlock(&chain->ctrl_mutex); > > > @@ -1426,6 +1499,11 @@ static int uvc_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems) > > > if (ret < 0) > > > return -ERESTARTSYS; > > > > > > + if (__uvc_query_v4l2_class(handle->chain, sev->id, 0) >= 0) { > > > + ret = 0; > > > + goto done; > > > + } > > > + > > > ctrl = uvc_find_control(handle->chain, sev->id, &mapping); > > > if (ctrl == NULL) { > > > ret = -EINVAL; > > > @@ -1459,7 +1537,10 @@ static void uvc_ctrl_del_event(struct v4l2_subscribed_event *sev) > > > struct uvc_fh *handle = container_of(sev->fh, struct uvc_fh, vfh); > > > > > > mutex_lock(&handle->chain->ctrl_mutex); > > > + if (__uvc_query_v4l2_class(handle->chain, sev->id, 0) >= 0) > > > + goto done; > > > list_del(&sev->node); > > > +done: > > > mutex_unlock(&handle->chain->ctrl_mutex); > > > } > > > > > > @@ -1577,6 +1658,9 @@ int uvc_ctrl_get(struct uvc_video_chain *chain, > > > struct uvc_control *ctrl; > > > struct uvc_control_mapping *mapping; > > > > > > + if (__uvc_query_v4l2_class(chain, xctrl->id, 0) >= 0) > > > + return -EACCES; > > > + > > > ctrl = uvc_find_control(chain, xctrl->id, &mapping); > > > if (ctrl == NULL) > > > return -EINVAL; > > > @@ -1596,6 +1680,9 @@ int uvc_ctrl_set(struct uvc_fh *handle, > > > s32 max; > > > int ret; > > > > > > + if (__uvc_query_v4l2_class(chain, xctrl->id, 0) >= 0) > > > + return -EACCES; > > > + > > > ctrl = uvc_find_control(chain, xctrl->id, &mapping); > > > if (ctrl == NULL) > > > return -EINVAL; > > > @@ -2062,6 +2149,7 @@ static int __uvc_ctrl_add_mapping(struct uvc_video_chain *chain, > > > { > > > struct uvc_control_mapping *map; > > > unsigned int size; > > > + unsigned int i; > > > > > > /* Most mappings come from static kernel data and need to be duplicated. > > > * Mappings that come from userspace will be unnecessarily duplicated, > > > @@ -2085,6 +2173,14 @@ static int __uvc_ctrl_add_mapping(struct uvc_video_chain *chain, > > > if (map->set == NULL) > > > map->set = uvc_set_le_value; > > > > > > + for (i = 0; i < ARRAY_SIZE(uvc_control_class); i++) { > > > + if (V4L2_CTRL_ID2WHICH(uvc_control_class[i].id) == > > > + V4L2_CTRL_ID2WHICH(map->id)) { > > > + chain->ctrl_class_bitmap |= BIT(i); > > > + break; > > > + } > > > + } > > > + > > > list_add_tail(&map->list, &ctrl->info.mappings); > > > uvc_dbg(chain->dev, CONTROL, "Adding mapping '%s' to control %pUl/%u\n", > > > map->name, ctrl->info.entity, ctrl->info.selector); > > > diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h > > > index 97df5ecd66c9..1f17e4253673 100644 > > > --- a/drivers/media/usb/uvc/uvcvideo.h > > > +++ b/drivers/media/usb/uvc/uvcvideo.h > > > @@ -262,6 +262,11 @@ struct uvc_control_mapping { > > > u8 *data); > > > }; > > > > > > +struct uvc_control_class { > > > + u32 id; > > > + char name[32]; > > > +}; > > > + > > > struct uvc_control { > > > struct uvc_entity *entity; > > > struct uvc_control_info info; > > > @@ -475,6 +480,7 @@ struct uvc_video_chain { > > > > > > struct v4l2_prio_state prio; /* V4L2 priority state */ > > > u32 caps; /* V4L2 chain-wide caps */ > > > + u8 ctrl_class_bitmap; /* Bitmap of valid classes */ > > > }; > > > > > > struct uvc_stats_frame { > > > > > > > -- > Regards, > > Laurent Pinchart -- Ricardo Ribalda