[71/75] backports: Add usb_check_int_endpoints()

Commit Message

Hauke Mehrtens June 27, 2024, 11:47 p.m. UTC

This was added together with usb_check_bulk_endpoints(). The carl9170
driver uses this function.

Signed-off-by: Hauke Mehrtens <[e-mail]>
---
 backport/backport-include/linux/usb.h |  2 ++
 backport/compat/backport-6.4.c        | 26 ++++++++++++++++++++++++++
 2 files changed, 28 insertions(+)

Patch

diff --git a/backport/backport-include/linux/usb.h b/backport/backport-include/linux/usb.h
index 0f6c3b88..ce85f1e1 100644
--- a/backport/backport-include/linux/usb.h
+++ b/backport/backport-include/linux/usb.h
@@ -11,6 +11,8 @@ 
 #define usb_check_bulk_endpoints LINUX_BACKPORT(usb_check_bulk_endpoints)
 bool usb_check_bulk_endpoints(
 		const struct usb_interface *intf, const u8 *ep_addrs);
+bool usb_check_int_endpoints(
+		const struct usb_interface *intf, const u8 *ep_addrs);
 #endif /* < 5.15 */
 
 #if LINUX_VERSION_IS_LESS(5,19,0)
diff --git a/backport/compat/backport-6.4.c b/backport/compat/backport-6.4.c
index 73177e24..1291fa02 100644
--- a/backport/compat/backport-6.4.c
+++ b/backport/compat/backport-6.4.c
@@ -58,4 +58,30 @@  bool usb_check_bulk_endpoints(
 	return true;
 }
 EXPORT_SYMBOL_GPL(usb_check_bulk_endpoints);
+
+/**
+ * usb_check_int_endpoints - Check whether an interface's current altsetting
+ * contains a set of interrupt endpoints with the given addresses.
+ * @intf: the interface whose current altsetting should be searched
+ * @ep_addrs: 0-terminated array of the endpoint addresses (number and
+ * direction) to look for
+ *
+ * Search for endpoints with the specified addresses and check their types.
+ *
+ * Return: %true if all the endpoints are found and are interrupt,
+ * %false otherwise.
+ */
+bool usb_check_int_endpoints(
+		const struct usb_interface *intf, const u8 *ep_addrs)
+{
+	const struct usb_host_endpoint *ep;
+
+	for (; *ep_addrs; ++ep_addrs) {
+		ep = usb_find_endpoint(intf, *ep_addrs);
+		if (!ep || !usb_endpoint_xfer_int(&ep->desc))
+			return false;
+	}
+	return true;
+}
+EXPORT_SYMBOL_GPL(usb_check_int_endpoints);
 #endif