[media] rc: rc-ir-raw: Add scancode encoder callback
Add a callback to raw ir handlers for encoding and modulating a scancode
to a set of raw events. This could be used for transmit, or for
converting a wakeup scancode filter to a form that is more suitable for
raw hardware wake up filters.
Signed-off-by: James Hogan <james@albanarts.com>
Signed-off-by: Antti Seppälä <a.seppala@gmail.com>
Cc: David Härdeman <david@hardeman.nu>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
diff --git a/drivers/media/rc/rc-ir-raw.c b/drivers/media/rc/rc-ir-raw.c
index b732ac6..dd47fe5 100644
--- a/drivers/media/rc/rc-ir-raw.c
+++ b/drivers/media/rc/rc-ir-raw.c
@@ -246,6 +246,43 @@
return 0;
}
+/**
+ * ir_raw_encode_scancode() - Encode a scancode as raw events
+ *
+ * @protocols: permitted protocols
+ * @scancode: scancode filter describing a single scancode
+ * @events: array of raw events to write into
+ * @max: max number of raw events
+ *
+ * Attempts to encode the scancode as raw events.
+ *
+ * Returns: The number of events written.
+ * -ENOBUFS if there isn't enough space in the array to fit the
+ * encoding. In this case all @max events will have been written.
+ * -EINVAL if the scancode is ambiguous or invalid, or if no
+ * compatible encoder was found.
+ */
+int ir_raw_encode_scancode(u64 protocols,
+ const struct rc_scancode_filter *scancode,
+ struct ir_raw_event *events, unsigned int max)
+{
+ struct ir_raw_handler *handler;
+ int ret = -EINVAL;
+
+ mutex_lock(&ir_raw_handler_lock);
+ list_for_each_entry(handler, &ir_raw_handler_list, list) {
+ if (handler->protocols & protocols && handler->encode) {
+ ret = handler->encode(protocols, scancode, events, max);
+ if (ret >= 0 || ret == -ENOBUFS)
+ break;
+ }
+ }
+ mutex_unlock(&ir_raw_handler_lock);
+
+ return ret;
+}
+EXPORT_SYMBOL(ir_raw_encode_scancode);
+
/*
* Used to (un)register raw event clients
*/