On Tue, Mar 13, 2018 at 03:26:19PM +0800, Kai-Heng Feng wrote:
> +     usbcore.quirks=
> +                     [USB] A list of quirks entries to supplement or
> +                     override the built-in usb core quirk list.  List
> +                     entries are separated by commas.  Each entry has
> +                     the form VID:PID:Flags where VID and PID are Vendor
> +                     and Product ID values (4-digit hex numbers) and
> +                     Flags is a set of characters, each corresponding
> +                     to a common usb core quirk flag as follows:

This doesn't really tell me that the specified quirks will be XORed with
the built-in quirks.  Maybe something like ...

                        [USB] A list of quirk entries to augment the
                        built-in usb core quirk list.  List entries are
                        separated by commas.  Each entry has the form
                        VendorID:ProductID:Flags.  The IDs are 4-digit hex
                        numbers and Flags is a set of letters.  Each letter
                        will change the built-in quirk; setting it if it is
                        clear and clearing it if it is set.  The letters
                        have the following meanings:

> +             /* Each entry consists of VID:PID:flags */
> +             field = strsep(&p, ":");
> +             if (!field)
> +                     break;
> +
> +             if (kstrtou16(field, 16, &vid))
> +                     break;
> +
> +             field = strsep(&p, ":");
> +             if (!field)
> +                     break;
> +
> +             if (kstrtou16(field, 16, &pid))
> +                     break;

Is there a reason to not use sscanf here like hid-quirks.c does? 

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