From: James Hogan <james@xxxxxxxxxxxxx>
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 to a form that is more suitable for raw
hardware wake up filters.
Signed-off-by: James Hogan <james@xxxxxxxxxxxxx>
Signed-off-by: Antti Seppälä <a.seppala@xxxxxxxxx>
Signed-off-by: Sean Young <sean@xxxxxxxx>
Cc: David Härdeman <david@xxxxxxxxxxx>
---
drivers/media/rc/rc-core-priv.h | 2 ++
drivers/media/rc/rc-ir-raw.c | 36 ++++++++++++++++++++++++++++++++++++
include/media/rc-core.h | 2 ++
3 files changed, 40 insertions(+)
diff --git a/drivers/media/rc/rc-core-priv.h b/drivers/media/rc/rc-core-priv.h
index 585d5e5..d8be011 100644
--- a/drivers/media/rc/rc-core-priv.h
+++ b/drivers/media/rc/rc-core-priv.h
@@ -28,6 +28,8 @@ struct ir_raw_handler {
u64 protocols; /* which are handled by this handler */
int (*decode)(struct rc_dev *dev, struct ir_raw_event event);
+ int (*encode)(enum rc_type protocol, u32 scancode,
+ struct ir_raw_event *events, unsigned int max);
/* These two should only be used by the lirc decoder */
int (*raw_register)(struct rc_dev *dev);
diff --git a/drivers/media/rc/rc-ir-raw.c b/drivers/media/rc/rc-ir-raw.c
index 171bdba..c23c877 100644
--- a/drivers/media/rc/rc-ir-raw.c
+++ b/drivers/media/rc/rc-ir-raw.c
@@ -249,6 +249,42 @@ static void ir_raw_disable_protocols(struct rc_dev *dev, u64 protocols)
mutex_unlock(&dev->lock);
}
+/**
+ * ir_raw_encode_scancode() - Encode a scancode as raw events
+ *
+ * @protocol: protocol
+ * @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(enum rc_type protocol, u32 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 & (1 << protocol) && handler->encode) {
+ ret = handler->encode(protocol, 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
*/
diff --git a/include/media/rc-core.h b/include/media/rc-core.h
index 19a0ad2..bdf3ff0 100644
--- a/include/media/rc-core.h
+++ b/include/media/rc-core.h
@@ -304,6 +304,8 @@ int ir_raw_event_store_edge(struct rc_dev *dev, enum raw_event_type type);
int ir_raw_event_store_with_filter(struct rc_dev *dev,
struct ir_raw_event *ev);
void ir_raw_event_set_idle(struct rc_dev *dev, bool idle);
+int ir_raw_encode_scancode(enum rc_type protocol, u32 scancode,
+ struct ir_raw_event *events, unsigned int max);
static inline void ir_raw_event_reset(struct rc_dev *dev)
{
--
2.9.3
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