linux-kernel - Re: [PATCH v2] media: uvcvideo: limit power line control for Sonix Technology

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Message-ID: <Yv7Udve8bFXsBr0/@pendragon.ideasonboard.com>
Date:   Fri, 19 Aug 2022 03:08:22 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     huanglei <huanglei@...inos.cn>
Cc:     mchehab@...nel.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] media: uvcvideo: limit power line control for Sonix
 Technology

Hi Huanglei,

Thank you for the patch.

On Thu, Aug 18, 2022 at 10:23:38AM +0800, huanglei wrote:
> The device does not implement the power line control correctly. Add a
> corresponding control mapping override.
> 
> Bus 003 Device 003: ID 3277:0072 Sonix Technology Co., Ltd. USB 2.0 Camera
> Device Descriptor:
>   bLength                18
>   bDescriptorType         1
>   bcdUSB               2.00
>   bDeviceClass          239 Miscellaneous Device
>   bDeviceSubClass         2
>   bDeviceProtocol         1 Interface Association
>   bMaxPacketSize0        64
>   idVendor           0x3277
>   idProduct          0x0072
>   bcdDevice            1.00
>   iManufacturer           2 Sonix Technology Co., Ltd.
>   iProduct                1 USB 2.0 Camera
>   iSerial                 3 REV0001
>   bNumConfigurations      1

Would you be able to send me the full descriptors for that device ?

> Signed-off-by: huanglei <huanglei@...inos.cn>
> ---
>  drivers/media/usb/uvc/uvc_driver.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
> index 9c05776f11d1..218db3f1db5d 100644
> --- a/drivers/media/usb/uvc/uvc_driver.c
> +++ b/drivers/media/usb/uvc/uvc_driver.c
> @@ -3282,6 +3282,15 @@ static const struct usb_device_id uvc_ids[] = {
>  	  .bInterfaceSubClass	= 1,
>  	  .bInterfaceProtocol	= 0,
>  	  .driver_info		= UVC_INFO_META(V4L2_META_FMT_D4XX) },
> +	/* Sonix Technology USB 2.0 Camera */
> +	{ .match_flags		= USB_DEVICE_ID_MATCH_DEVICE
> +				| USB_DEVICE_ID_MATCH_INT_INFO,
> +	  .idVendor		= 0x3277,
> +	  .idProduct		= 0x0072,
> +	  .bInterfaceClass	= USB_CLASS_VENDOR_SPEC,

Does the device really implement a vendor class ?

> +	  .bInterfaceSubClass	= 1,
> +	  .bInterfaceProtocol	= 0,
> +	  .driver_info		= (kernel_ulong_t)&uvc_ctrl_power_line_limited },

This should be moved up to keep the list sorted by VID:PID.

>  	/* Generic USB Video Class */
>  	{ USB_INTERFACE_INFO(USB_CLASS_VIDEO, 1, UVC_PC_PROTOCOL_UNDEFINED) },
>  	{ USB_INTERFACE_INFO(USB_CLASS_VIDEO, 1, UVC_PC_PROTOCOL_15) },

-- 
Regards,

Laurent Pinchart