linux-kernel - Re: [PATCH v3] USB: announce bcdDevice as well as idVendor, idProduct.

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Date:   Mon, 26 Mar 2018 14:27:30 -0400 (EDT)
From:   Alan Stern <stern@...land.harvard.edu>
To:     Benson Leung <bleung@...omium.org>
cc:     gregkh@...uxfoundation.org, <linux-usb@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <achant@...gle.com>,
        <bleung@...gle.com>
Subject: Re: [PATCH v3] USB: announce bcdDevice as well as idVendor, idProduct.

On Sat, 24 Mar 2018, Benson Leung wrote:

> Print bcdDevice which is used by vendors to identify different versions
> of the same product (or different versions of firmware).
> 
> Adding this to the logs will be useful for support purposes.
> 
> Match the %2x.%02x formatting that's used by lsusb -v for this same value.
> 
> Signed-off-by: Benson Leung <bleung@...omium.org>
> ---
> 
> v3: Remove unnecessary whitespace changes.
> v2: Format for decimal output.
> 
>  drivers/usb/core/hub.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
> index aaeef03c0d83..779725836cf5 100644
> --- a/drivers/usb/core/hub.c
> +++ b/drivers/usb/core/hub.c
> @@ -2192,9 +2192,13 @@ static void show_string(struct usb_device *udev, char *id, char *string)
>  
>  static void announce_device(struct usb_device *udev)
>  {
> -	dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n",
> +	u16 bcdDevice = le16_to_cpu(udev->descriptor.bcdDevice);
> +
> +	dev_info(&udev->dev,
> +		"New USB device found, idVendor=%04x, idProduct=%04x, bcdDevice=%2x.%02x\n",
>  		le16_to_cpu(udev->descriptor.idVendor),
> -		le16_to_cpu(udev->descriptor.idProduct));
> +		le16_to_cpu(udev->descriptor.idProduct),
> +		bcdDevice >> 8, bcdDevice & 0xff);
>  	dev_info(&udev->dev,
>  		"New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n",
>  		udev->descriptor.iManufacturer,

Acked-by: Alan Stern <stern@...land.harvard.edu>