diff options
Diffstat (limited to 'drivers/usb/core/usb.c')
| -rw-r--r-- | drivers/usb/core/usb.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c index ca9ff6ad8e73..939dc4aafb89 100644 --- a/drivers/usb/core/usb.c +++ b/drivers/usb/core/usb.c @@ -1139,6 +1139,25 @@ u32 usb_endpoint_max_periodic_payload(struct usb_device *udev, } EXPORT_SYMBOL_GPL(usb_endpoint_max_periodic_payload); +/** + * usb_endpoint_is_hs_isoc_double - Tell whether an endpoint uses USB 2 + * Isochronous Double IN Bandwidth + * @udev: The USB device + * @ep: The endpoint + * + * Returns: true if an endpoint @ep conforms to USB 2 Isochronous Double IN + * Bandwidth ECN, false otherwise. + */ +bool usb_endpoint_is_hs_isoc_double(struct usb_device *udev, + const struct usb_host_endpoint *ep) +{ + return ep->eusb2_isoc_ep_comp.bDescriptorType && + le16_to_cpu(udev->descriptor.bcdUSB) == 0x220 && + usb_endpoint_is_isoc_in(&ep->desc) && + !le16_to_cpu(ep->desc.wMaxPacketSize); +} +EXPORT_SYMBOL_GPL(usb_endpoint_is_hs_isoc_double); + /* * Notifications of device and interface registration */ |