soc: apple: rtkit: Add apple_rtkit_has_endpoint()

To be used by RTKit consumers to check if an endpoint
is present and should be enabled.

Signed-off-by: Sasha Finkelstein <fnkl.kernel@gmail.com>

Author: WhatAmISupposedToPutHere

drivers/soc/apple/rtkit.c

@@ -639,6 +639,12 @@ int apple_rtkit_poll(struct apple_rtkit *rtk)
 }
 EXPORT_SYMBOL_GPL(apple_rtkit_poll);
 
+bool apple_rtkit_has_endpoint(struct apple_rtkit *rtk, u8 ep)
+{
+	return test_bit(ep, rtk->endpoints);
+}
+EXPORT_SYMBOL_GPL(apple_rtkit_has_endpoint);
+
 int apple_rtkit_start_ep(struct apple_rtkit *rtk, u8 endpoint)
 {
 	u64 msg;

include/linux/soc/apple/rtkit.h

@@ -172,4 +172,12 @@ int apple_rtkit_send_message(struct apple_rtkit *rtk, u8 ep, u64 message,
  */
 int apple_rtkit_poll(struct apple_rtkit *rtk);
 
+/*
+ * Checks if an endpoint with a given index exists
+ *
+ * @rtk:            RTKit reference
+ * @ep:             endpoint to check for
+ */
+bool apple_rtkit_has_endpoint(struct apple_rtkit *rtk, u8 ep);
+
 #endif /* _LINUX_APPLE_RTKIT_H_ */