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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/usb/core/usb.c
..
..
@@ -208,6 +208,82 @@
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 EXPORT_SYMBOL_GPL(usb_find_common_endpoints_reverse);
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 /**
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+ * usb_find_endpoint() - Given an endpoint address, search for the endpoint's
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+ * usb_host_endpoint structure in an interface's current altsetting.
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+ * @intf: the interface whose current altsetting should be searched
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+ * @ep_addr: the endpoint address (number and direction) to find
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+ *
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+ * Search the altsetting's list of endpoints for one with the specified address.
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+ *
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+ * Return: Pointer to the usb_host_endpoint if found, %NULL otherwise.
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+ */
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+static const struct usb_host_endpoint *usb_find_endpoint(
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+		const struct usb_interface *intf, unsigned int ep_addr)
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+{
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+	int n;
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+	const struct usb_host_endpoint *ep;
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+
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+	n = intf->cur_altsetting->desc.bNumEndpoints;
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+	ep = intf->cur_altsetting->endpoint;
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+	for (; n > 0; (--n, ++ep)) {
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+		if (ep->desc.bEndpointAddress == ep_addr)
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+			return ep;
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+	}
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+	return NULL;
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+}
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+
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+/**
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+ * usb_check_bulk_endpoints - Check whether an interface's current altsetting
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+ * contains a set of bulk endpoints with the given addresses.
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+ * @intf: the interface whose current altsetting should be searched
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+ * @ep_addrs: 0-terminated array of the endpoint addresses (number and
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+ * direction) to look for
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+ *
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+ * Search for endpoints with the specified addresses and check their types.
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+ *
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+ * Return: %true if all the endpoints are found and are bulk, %false otherwise.
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+ */
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+bool usb_check_bulk_endpoints(
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+		const struct usb_interface *intf, const u8 *ep_addrs)
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+{
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+	const struct usb_host_endpoint *ep;
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+
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+	for (; *ep_addrs; ++ep_addrs) {
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+		ep = usb_find_endpoint(intf, *ep_addrs);
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+		if (!ep || !usb_endpoint_xfer_bulk(&ep->desc))
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+			return false;
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+	}
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+	return true;
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+}
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+EXPORT_SYMBOL_GPL(usb_check_bulk_endpoints);
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+
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+/**
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+ * usb_check_int_endpoints - Check whether an interface's current altsetting
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+ * contains a set of interrupt endpoints with the given addresses.
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+ * @intf: the interface whose current altsetting should be searched
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+ * @ep_addrs: 0-terminated array of the endpoint addresses (number and
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+ * direction) to look for
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+ *
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+ * Search for endpoints with the specified addresses and check their types.
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+ *
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+ * Return: %true if all the endpoints are found and are interrupt,
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+ * %false otherwise.
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+ */
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+bool usb_check_int_endpoints(
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+		const struct usb_interface *intf, const u8 *ep_addrs)
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+{
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+	const struct usb_host_endpoint *ep;
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+
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+	for (; *ep_addrs; ++ep_addrs) {
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+		ep = usb_find_endpoint(intf, *ep_addrs);
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+		if (!ep || !usb_endpoint_xfer_int(&ep->desc))
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+			return false;
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+	}
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+	return true;
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+}
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+EXPORT_SYMBOL_GPL(usb_check_int_endpoints);
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+
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+/**
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  * usb_find_alt_setting() - Given a configuration, find the alternate setting
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  * for the given interface.
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  * @config: the configuration to search (not necessarily the current config).