• Sebastian Andrzej Siewior's avatar
    usb: gadget: remove usb_gadget_controller_number() · ed9cbda6
    Sebastian Andrzej Siewior authored
    The bcdDevice field is defined as
    |Device release number in binary-coded decimal
    in the USB 2.0 specification. We use this field to distinguish the UDCs
    from each other. In theory this could be used on the host side to apply
    certain quirks if the "special" UDC in combination with this gadget is
    used. This hasn't been done as far as I am aware. In practice it would
    be better to fix the UDC driver before shipping since a later release
    might not need this quirk anymore.
    
    There are some driver in tree (on the host side) which use the bcdDevice
    field to figure out special workarounds for a given firmware revision.
    This seems to make sense. Therefore this patch converts all gadgets
    (except a few) to use the kernel version instead a random 2 or 3 plus
    the UDC number. The few that don't report kernel's version are:
    - webcam
      This one reports always a version 0x10 so allow it to do so in future.
    - nokia
      This one reports always 0x211. The comment says that this gadget works
      only if the UDC supports altsettings so I added a check for this.
    - serial
      This one reports 0x2400 + UDC number. Since the gadget version is 2.4
      this could make sense. Therefore bcdDevice is 0x2400 here.
    
    I also remove various gadget_is_<name> macros which are unused. The
    remaining few macros should be moved to feature / bug bitfield.
    Acked-by: default avatarMichal Nazarewicz <mina86@mina86.com>
    Signed-off-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
    Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
    ed9cbda6
hid.c 6.28 KB