linux-kernel - Re: [PATCH v7 4/8] media: uvcvideo: Limit power line control for Quanta UVC Webcam

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Message-ID: <YqyJUikNtzvgujob@pendragon.ideasonboard.com>
Date:   Fri, 17 Jun 2022 17:01:54 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Ricardo Ribalda <ribalda@...omium.org>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        tfiga@...omium.org, senozhatsky@...omium.org, yunkec@...gle.com
Subject: Re: [PATCH v7 4/8] media: uvcvideo: Limit power line control for
 Quanta UVC Webcam

Hi Ricardo,

Thank you for the patch.

On Fri, Jun 17, 2022 at 12:36:41PM +0200, Ricardo Ribalda wrote:
> The device does not implement the power line control correctly. Add a
> corresponding control mapping override.
> 
> Bus 001 Device 003: ID 0408:3090 Quanta Computer, Inc. USB2.0 HD UVC WebCam
> Device Descriptor:
>   bLength                18
>   bDescriptorType         1
>   bcdUSB               2.00
>   bDeviceClass          239 Miscellaneous Device
>   bDeviceSubClass         2
>   bDeviceProtocol         1 Interface Association
>   bMaxPacketSize0        64
>   idVendor           0x0408 Quanta Computer, Inc.
>   idProduct          0x3090
>   bcdDevice            0.04
>   iManufacturer           3 Quanta
>   iProduct                1 USB2.0 HD UVC WebCam
>   iSerial                 2 0x0001
>   bNumConfigurations      1
> 
> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
> Signed-off-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> ---
>  drivers/media/usb/uvc/uvc_driver.c | 35 ++++++++++++++++++++++++++++++
>  1 file changed, 35 insertions(+)
> 
> diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
> index 6c86faecbea2..4fb07084f1c0 100644
> --- a/drivers/media/usb/uvc/uvc_driver.c
> +++ b/drivers/media/usb/uvc/uvc_driver.c
> @@ -2643,6 +2643,32 @@ MODULE_PARM_DESC(timeout, "Streaming control requests timeout");
>   * Driver initialization and cleanup
>   */
>  
> +static const struct uvc_menu_info power_line_frequency_controls_limited[] = {
> +	{ 0, "Invalid" },
> +	{ 1, "50 Hz" },
> +	{ 2, "60 Hz" },
> +};

It's not nice to have to include the first item in the array, but we
can't fix that without modifying uvc_menu_info, which we can't do as
it's part of the UAPI. Let's keep it as-is, but I would then expose the
uvc_menu_info array from uvc_ctrl.c instead of duplicating it here.

> +
> +static const struct uvc_control_mapping uvc_ctrl_power_line_mapping_limited = {
> +	.id		= V4L2_CID_POWER_LINE_FREQUENCY,
> +	.entity		= UVC_GUID_UVC_PROCESSING,
> +	.selector	= UVC_PU_POWER_LINE_FREQUENCY_CONTROL,
> +	.size		= 2,
> +	.offset		= 0,
> +	.v4l2_type	= V4L2_CTRL_TYPE_MENU,
> +	.data_type	= UVC_CTRL_DATA_TYPE_ENUM,
> +	.menu_info	= power_line_frequency_controls_limited,
> +	.menu_min	= 1,
> +	.menu_count	= ARRAY_SIZE(power_line_frequency_controls_limited),
> +};
> +
> +static const struct uvc_device_info uvc_ctrl_power_line_limited = {
> +	.mappings = (const struct uvc_control_mapping *[]) {
> +		&uvc_ctrl_power_line_mapping_limited,
> +		NULL, /* Sentinel */
> +	},
> +};
> +
>  static const struct uvc_device_info uvc_quirk_probe_minmax = {
>  	.quirks = UVC_QUIRK_PROBE_MINMAX,
>  };
> @@ -2673,6 +2699,15 @@ static const struct uvc_device_info uvc_quirk_force_y8 = {
>   * though they are compliant.
>   */
>  static const struct usb_device_id uvc_ids[] = {
> +	/* Quanta USB2.0 HD UVC Webcam */
> +	{ .match_flags		= USB_DEVICE_ID_MATCH_DEVICE
> +				| USB_DEVICE_ID_MATCH_INT_INFO,
> +	  .idVendor		= 0x0408,
> +	  .idProduct		= 0x3090,
> +	  .bInterfaceClass	= USB_CLASS_VIDEO,
> +	  .bInterfaceSubClass	= 1,
> +	  .bInterfaceProtocol	= 0,
> +	  .driver_info		= (kernel_ulong_t)&uvc_ctrl_power_line_limited },
>  	/* LogiLink Wireless Webcam */
>  	{ .match_flags		= USB_DEVICE_ID_MATCH_DEVICE
>  				| USB_DEVICE_ID_MATCH_INT_INFO,

-- 
Regards,

Laurent Pinchart