Commit d6725169 authored by Sakari Ailus's avatar Sakari Ailus Committed by Greg Kroah-Hartman
Browse files

usb: core: Introduce usb_endpoint_is_hs_isoc_double() 



Introduce usb_endpoint_is_hs_isoc_double() tell whether an endpoint
conforms to USB 2.0 Isochronous Double IN Bandwidth ECN.

Signed-off-by: default avatarSakari Ailus <sakari.ailus@linux.intel.com>
Acked-by: default avatarMathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20250820143824.551777-7-sakari.ailus@linux.intel.com
parent 24b8762e

drivers/usb/core/usb.c

+19 −0
Original line number Diff line number Diff line
@@ -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

 */

include/linux/usb.h

+3 −0
Original line number Diff line number Diff line
@@ -2042,6 +2042,9 @@ static inline u16 usb_maxpacket(struct usb_device *udev, int pipe) 
u32 usb_endpoint_max_periodic_payload(struct usb_device *udev,

				      const struct usb_host_endpoint *ep);



bool usb_endpoint_is_hs_isoc_double(struct usb_device *udev,

				    const struct usb_host_endpoint *ep);



/* translate USB error codes to codes user space understands */

static inline int usb_translate_errors(int error_code)

{