1 files changed, 139 insertions, 0 deletions

diff --git a/drivers/media/rc/rc-ir-raw.c b/drivers/media/rc/rc-ir-raw.c
index b732ac6a26d8..b9e4645c731c 100644
--- a/drivers/media/rc/rc-ir-raw.c
+++ b/drivers/media/rc/rc-ir-raw.c
@@ -30,6 +30,7 @@ static LIST_HEAD(ir_raw_client_list);
 static DEFINE_MUTEX(ir_raw_handler_lock);
 static LIST_HEAD(ir_raw_handler_list);
 static u64 available_protocols;
+static u64 encode_protocols;
 
 static int ir_raw_event_thread(void *data)
 {
@@ -240,12 +241,146 @@ ir_raw_get_allowed_protocols(void)
 	return protocols;
 }
 
+/* used internally by the sysfs interface */
+u64
+ir_raw_get_encode_protocols(void)
+{
+	u64 protocols;
+
+	mutex_lock(&ir_raw_handler_lock);
+	protocols = encode_protocols;
+	mutex_unlock(&ir_raw_handler_lock);
+	return protocols;
+}
+
 static int change_protocol(struct rc_dev *dev, u64 *rc_type)
 {
 	/* the caller will update dev->enabled_protocols */
 	return 0;
 }
 
+/**
+ * ir_raw_gen_manchester() - Encode data with Manchester (bi-phase) modulation.
+ * @ev:		Pointer to pointer to next free event. *@ev is incremented for
+ *		each raw event filled.
+ * @max:	Maximum number of raw events to fill.
+ * @timings:	Manchester modulation timings.
+ * @n:		Number of bits of data.
+ * @data:	Data bits to encode.
+ *
+ * Encodes the @n least significant bits of @data using Manchester (bi-phase)
+ * modulation with the timing characteristics described by @timings, writing up
+ * to @max raw IR events using the *@ev pointer.
+ *
+ * Returns:	0 on success.
+ *		-ENOBUFS if there isn't enough space in the array to fit the
+ *		full encoded data. In this case all @max events will have been
+ *		written.
+ */
+int ir_raw_gen_manchester(struct ir_raw_event **ev, unsigned int max,
+			  const struct ir_raw_timings_manchester *timings,
+			  unsigned int n, unsigned int data)
+{
+	bool need_pulse;
+	unsigned int i;
+	int ret = -ENOBUFS;
+
+	i = 1 << (n - 1);
+
+	if (timings->leader) {
+		if (!max--)
+			return ret;
+		if (timings->pulse_space_start) {
+			init_ir_raw_event_duration((*ev)++, 1, timings->leader);
+
+			if (!max--)
+				return ret;
+			init_ir_raw_event_duration((*ev), 0, timings->leader);
+		} else {
+			init_ir_raw_event_duration((*ev), 1, timings->leader);
+		}
+		i >>= 1;
+	} else {
+		/* continue existing signal */
+		--(*ev);
+	}
+	/* from here on *ev will point to the last event rather than the next */
+
+	while (n && i > 0) {
+		need_pulse = !(data & i);
+		if (timings->invert)
+			need_pulse = !need_pulse;
+		if (need_pulse == !!(*ev)->pulse) {
+			(*ev)->duration += timings->clock;
+		} else {
+			if (!max--)
+				goto nobufs;
+			init_ir_raw_event_duration(++(*ev), need_pulse,
+						   timings->clock);
+		}
+
+		if (!max--)
+			goto nobufs;
+		init_ir_raw_event_duration(++(*ev), !need_pulse,
+					   timings->clock);
+		i >>= 1;
+	}
+
+	if (timings->trailer_space) {
+		if (!(*ev)->pulse)
+			(*ev)->duration += timings->trailer_space;
+		else if (!max--)
+			goto nobufs;
+		else
+			init_ir_raw_event_duration(++(*ev), 0,
+						   timings->trailer_space);
+	}
+
+	ret = 0;
+nobufs:
+	/* point to the next event rather than last event before returning */
+	++(*ev);
+	return ret;
+}
+EXPORT_SYMBOL(ir_raw_gen_manchester);
+
+/**
+ * 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
  */
@@ -328,6 +463,8 @@ int ir_raw_handler_register(struct ir_raw_handler *ir_raw_handler)
 		list_for_each_entry(raw, &ir_raw_client_list, list)
 			ir_raw_handler->raw_register(raw->dev);
 	available_protocols |= ir_raw_handler->protocols;
+	if (ir_raw_handler->encode)
+		encode_protocols |= ir_raw_handler->protocols;
 	mutex_unlock(&ir_raw_handler_lock);
 
 	return 0;
@@ -344,6 +481,8 @@ void ir_raw_handler_unregister(struct ir_raw_handler *ir_raw_handler)
 		list_for_each_entry(raw, &ir_raw_client_list, list)
 			ir_raw_handler->raw_unregister(raw->dev);
 	available_protocols &= ~ir_raw_handler->protocols;
+	if (ir_raw_handler->encode)
+		encode_protocols &= ~ir_raw_handler->protocols;
 	mutex_unlock(&ir_raw_handler_lock);
 }
 EXPORT_SYMBOL(ir_raw_handler_unregister);