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Message-ID: <YypjfCLkmHRrsD66@pendragon.ideasonboard.com>
Date: Wed, 21 Sep 2022 04:06:04 +0300
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Ricardo Ribalda <ribalda@...omium.org>
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>,
linux-kernel@...r.kernel.org, linux-media@...r.kernel.org
Subject: Re: [PATCH v2 1/2] media: uvcvideo: Implement mask for
V4L2_CTRL_TYPE_MENU
Hi Ricardo,
Thank you for the patch.
On Wed, Sep 21, 2022 at 12:57:29AM +0200, Ricardo Ribalda wrote:
> Replace the count with a mask field that let us choose not only the max
s/let/lets/
> value, but also the minimum value and what values are valid in between.
>
> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
> Suggested-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
>
> 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
Let's include <linux/bitops.h> in this file for ffs() and fls().
> @@ -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)),
This fits on a single line.
> .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),
And this and the next hunk would benefit, I think, from exceeding the 80
columns.
> },
> };
>
> @@ -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))
I may be missing something, but if i starts at 1, aren't you testing bit
N+1 for menu entry N ?
> + 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))
Same here.
> + 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)),
Here too I'd avoid the line wrap.
> };
>
> 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;
--
Regards,
Laurent Pinchart
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