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References: <20220920-standard-menues-v2-0-323be5539c22@chromium.org> <20220920-standard-menues-v2-1-323be5539c22@chromium.org>
In-Reply-To: <20220920-standard-menues-v2-1-323be5539c22@chromium.org>
From:   Ricardo Ribalda <ribalda@chromium.org>
Date:   Fri, 2 Dec 2022 18:34:26 +0100
Message-ID: <CANiDSCtzuOmSCPfYxm-uynfHRbr2AbvbqEGPniy+=vkKjdgadA@mail.gmail.com>
Subject: Re: [PATCH RESEND v2 1/2] media: uvcvideo: Implement mask for V4L2_CTRL_TYPE_MENU
To:     Mauro Carvalho Chehab <mchehab@kernel.org>
Cc:     Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
        linux-kernel@vger.kernel.org, linux-media@vger.kernel.org
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Precedence: bulk

Please ignore this one. It is already part of the series Follow-up
patches for uvc v4l2-compliance

Sorry for sending it duplicated

On Fri, 2 Dec 2022 at 18:26, Ricardo Ribalda <ribalda@chromium.org> wrote:
>
> Replace the count with a mask field that let us choose not only the max
> value, but also the minimum value and what values are valid in between.
>
> Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
> Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> ---
>  drivers/media/usb/uvc/uvc_ctrl.c   | 32 ++++++++++++++++++++++----------
>  drivers/media/usb/uvc/uvc_driver.c |  3 ++-
>  drivers/media/usb/uvc/uvc_v4l2.c   |  2 +-
>  drivers/media/usb/uvc/uvcvideo.h   |  2 +-
>  4 files changed, 26 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
> index 8c208db9600b..13bc57e2a08d 100644
> --- a/drivers/media/usb/uvc/uvc_ctrl.c
> +++ b/drivers/media/usb/uvc/uvc_ctrl.c
> @@ -524,7 +524,8 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
>                 .v4l2_type      = V4L2_CTRL_TYPE_MENU,
>                 .data_type      = UVC_CTRL_DATA_TYPE_BITMASK,
>                 .menu_info      = exposure_auto_controls,
> -               .menu_count     = ARRAY_SIZE(exposure_auto_controls),
> +               .menu_mask      =
> +                       BIT_MASK(ARRAY_SIZE(exposure_auto_controls)),
>                 .slave_ids      = { V4L2_CID_EXPOSURE_ABSOLUTE, },
>         },
>         {
> @@ -730,7 +731,8 @@ static const struct uvc_control_mapping uvc_ctrl_mappings_uvc11[] = {
>                 .v4l2_type      = V4L2_CTRL_TYPE_MENU,
>                 .data_type      = UVC_CTRL_DATA_TYPE_ENUM,
>                 .menu_info      = power_line_frequency_controls,
> -               .menu_count     = ARRAY_SIZE(power_line_frequency_controls) - 1,
> +               .menu_mask      =
> +                       BIT_MASK(ARRAY_SIZE(power_line_frequency_controls) - 1),
>         },
>  };
>
> @@ -744,7 +746,8 @@ static const struct uvc_control_mapping uvc_ctrl_mappings_uvc15[] = {
>                 .v4l2_type      = V4L2_CTRL_TYPE_MENU,
>                 .data_type      = UVC_CTRL_DATA_TYPE_ENUM,
>                 .menu_info      = power_line_frequency_controls,
> -               .menu_count     = ARRAY_SIZE(power_line_frequency_controls),
> +               .menu_mask      =
> +                       BIT_MASK(ARRAY_SIZE(power_line_frequency_controls)),
>         },
>  };
>
> @@ -974,7 +977,9 @@ static s32 __uvc_ctrl_get_value(struct uvc_control_mapping *mapping,
>                 const struct uvc_menu_info *menu = mapping->menu_info;
>                 unsigned int i;
>
> -               for (i = 0; i < mapping->menu_count; ++i, ++menu) {
> +               for (i = 1; BIT(i) <= mapping->menu_mask; ++i, ++menu) {
> +                       if (!test_bit(i, &mapping->menu_mask))
> +                               continue;
>                         if (menu->value == value) {
>                                 value = i;
>                                 break;
> @@ -1148,12 +1153,14 @@ static int __uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
>
>         switch (mapping->v4l2_type) {
>         case V4L2_CTRL_TYPE_MENU:
> -               v4l2_ctrl->minimum = 0;
> -               v4l2_ctrl->maximum = mapping->menu_count - 1;
> +               v4l2_ctrl->minimum = ffs(mapping->menu_mask) - 1;
> +               v4l2_ctrl->maximum = fls(mapping->menu_mask) - 1;
>                 v4l2_ctrl->step = 1;
>
>                 menu = mapping->menu_info;
> -               for (i = 0; i < mapping->menu_count; ++i, ++menu) {
> +               for (i = 1; BIT(i) <= mapping->menu_mask; ++i, ++menu) {
> +                       if (!test_bit(i, &mapping->menu_mask))
> +                               continue;
>                         if (menu->value == v4l2_ctrl->default_value) {
>                                 v4l2_ctrl->default_value = i;
>                                 break;
> @@ -1268,7 +1275,7 @@ int uvc_query_v4l2_menu(struct uvc_video_chain *chain,
>                 goto done;
>         }
>
> -       if (query_menu->index >= mapping->menu_count) {
> +       if (!test_bit(query_menu->index, &mapping->menu_mask)) {
>                 ret = -EINVAL;
>                 goto done;
>         }
> @@ -1776,8 +1783,13 @@ int uvc_ctrl_set(struct uvc_fh *handle,
>                 break;
>
>         case V4L2_CTRL_TYPE_MENU:
> -               if (xctrl->value < 0 || xctrl->value >= mapping->menu_count)
> +               if (xctrl->value < (ffs(mapping->menu_mask) - 1) ||
> +                   xctrl->value > (fls(mapping->menu_mask) - 1))
>                         return -ERANGE;
> +
> +               if (!test_bit(xctrl->value, &mapping->menu_mask))
> +                       return -EINVAL;
> +
>                 value = mapping->menu_info[xctrl->value].value;
>
>                 /*
> @@ -2227,7 +2239,7 @@ static int __uvc_ctrl_add_mapping(struct uvc_video_chain *chain,
>
>         INIT_LIST_HEAD(&map->ev_subs);
>
> -       size = sizeof(*mapping->menu_info) * mapping->menu_count;
> +       size = sizeof(*mapping->menu_info) * fls(mapping->menu_mask);
>         map->menu_info = kmemdup(mapping->menu_info, size, GFP_KERNEL);
>         if (map->menu_info == NULL) {
>                 kfree(map->name);
> diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
> index 9c05776f11d1..09cc459c1253 100644
> --- a/drivers/media/usb/uvc/uvc_driver.c
> +++ b/drivers/media/usb/uvc/uvc_driver.c
> @@ -2675,7 +2675,8 @@ static const struct uvc_control_mapping uvc_ctrl_power_line_mapping_limited = {
>         .v4l2_type      = V4L2_CTRL_TYPE_MENU,
>         .data_type      = UVC_CTRL_DATA_TYPE_ENUM,
>         .menu_info      = power_line_frequency_controls_limited,
> -       .menu_count     = ARRAY_SIZE(power_line_frequency_controls_limited),
> +       .menu_mask      =
> +               BIT_MASK(ARRAY_SIZE(power_line_frequency_controls_limited)),
>  };
>
>  static const struct uvc_device_info uvc_ctrl_power_line_limited = {
> diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
> index 4cc3fa6b8c98..07c7acce8025 100644
> --- a/drivers/media/usb/uvc/uvc_v4l2.c
> +++ b/drivers/media/usb/uvc/uvc_v4l2.c
> @@ -80,7 +80,7 @@ static int uvc_ioctl_ctrl_map(struct uvc_video_chain *chain,
>                         goto free_map;
>                 }
>
> -               map->menu_count = xmap->menu_count;
> +               map->menu_mask = BIT_MASK(xmap->menu_count);
>                 break;
>
>         default:
> diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
> index 24c911aeebce..fde4e975334f 100644
> --- a/drivers/media/usb/uvc/uvcvideo.h
> +++ b/drivers/media/usb/uvc/uvcvideo.h
> @@ -255,7 +255,7 @@ struct uvc_control_mapping {
>         u32 data_type;
>
>         const struct uvc_menu_info *menu_info;
> -       u32 menu_count;
> +       unsigned long menu_mask;
>
>         u32 master_id;
>         s32 master_manual;
>
> --
> 2.39.0.rc0.267.gcb52ba06e7-goog-b4-0.11.0-dev-696ae


-- 
Ricardo Ribalda