media: cec-pin: add 'received' callback

Drivers that use the CEC pin framework have no way of processing messages
themselves by providing the 'received' callback. This is present in
cec_ops, but not in cec_pin_ops.

Add support for this callback.
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/cec/cec-pin.c

@@ -1279,6 +1279,15 @@ static void cec_pin_adap_free(struct cec_adapter *adap)
 	kfree(pin);
 }
 
+static int cec_pin_received(struct cec_adapter *adap, struct cec_msg *msg)
+{
+	struct cec_pin *pin = adap->pin;
+
+	if (pin->ops->received)
+		return pin->ops->received(adap, msg);
+	return -ENOMSG;
+}
+
 void cec_pin_changed(struct cec_adapter *adap, bool value)
 {
 	struct cec_pin *pin = adap->pin;
@@ -1301,6 +1310,7 @@ static const struct cec_adap_ops cec_pin_adap_ops = {
 	.error_inj_parse_line = cec_pin_error_inj_parse_line,
 	.error_inj_show = cec_pin_error_inj_show,
 #endif
+	.received = cec_pin_received,
 };
 
 struct cec_adapter *cec_pin_allocate_adapter(const struct cec_pin_ops *pin_ops,

include/media/cec-pin.h

@@ -29,8 +29,11 @@
  *		an error if negative. If NULL or -ENOTTY is returned,
  *		then this is not supported.
  *
- * These operations are used by the cec pin framework to manipulate
- * the CEC pin.
+ * @received:	optional. High-level CEC message callback. Allows the driver
+ *		to process CEC messages.
+ *
+ * These operations (except for the @received op) are used by the
+ * cec pin framework to manipulate the CEC pin.
  */
 struct cec_pin_ops {
 	bool (*read)(struct cec_adapter *adap);
@@ -42,6 +45,9 @@ struct cec_pin_ops {
 	void (*status)(struct cec_adapter *adap, struct seq_file *file);
 	int  (*read_hpd)(struct cec_adapter *adap);
 	int  (*read_5v)(struct cec_adapter *adap);
+
+	/* High-level CEC message callback */
+	int (*received)(struct cec_adapter *adap, struct cec_msg *msg);
 };
 
 /**