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

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Message-ID: <CANVWZtGS9x-zLAgtV0rkgnBR0kLHTT0LYjKEreNy6qjkcC75PA@mail.gmail.com>
Date:   Fri, 23 Mar 2018 18:08:07 -0700
From:   Andrew Chant <achant@...gle.com>
To:     Benson Leung <bleung@...omium.org>
Cc:     gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, Benson Leung <bleung@...gle.com>
Subject: Re: [PATCH] USB: announce bcdDevice as well as idVendor, idProduct.

On Fri, Mar 23, 2018 at 5:48 PM, Andrew Chant <achant@...gle.com> wrote:
> On Fri, Mar 23, 2018 at 5:33 PM, Benson Leung <bleung@...omium.org> 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.
>>
>> Signed-off-by: Benson Leung <bleung@...omium.org>
>> ---
>>  drivers/usb/core/hub.c | 16 +++++++++-------
>>  1 file changed, 9 insertions(+), 7 deletions(-)
>>
>> diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
>> index aaeef03c0d83..739d599814b6 100644
>> --- a/drivers/usb/core/hub.c
>> +++ b/drivers/usb/core/hub.c
>> @@ -2192,14 +2192,16 @@ 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",
>> -               le16_to_cpu(udev->descriptor.idVendor),
>> -               le16_to_cpu(udev->descriptor.idProduct));
>>         dev_info(&udev->dev,
>> -               "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n",
>> -               udev->descriptor.iManufacturer,
>> -               udev->descriptor.iProduct,
>> -               udev->descriptor.iSerialNumber);
>> +                "New USB device found, idVendor=%04x, idProduct=%04x, bcdDevice=%04x\n",
>> +                le16_to_cpu(udev->descriptor.idVendor),
>> +                le16_to_cpu(udev->descriptor.idProduct),
>> +                le16_to_cpu(udev->descriptor.bcdDevice));
>> +       dev_info(&udev->dev,
>> +                "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n",
>> +                udev->descriptor.iManufacturer,
>> +                udev->descriptor.iProduct,
>> +                udev->descriptor.iSerialNumber);
>>         show_string(udev, "Product", udev->product);
>>         show_string(udev, "Manufacturer", udev->manufacturer);
>>         show_string(udev, "SerialNumber", udev->serial);
>> --
>> 2.17.0.rc0.231.g781580f067-goog
>>
>
>> +                "New USB device found, idVendor=%04x, idProduct=%04x, bcdDevice=%04x\n",
> Can you please decode bcdDevice into a decimal string?
>
> lsusb -v does this (bcdDevice: 0.03 for example) and in my experience
> it has generally matched up with how hardware manufacturers refer
> to their firmware.

Nevermind, %x should show bcd properly.  looks fine.