media: cec: move cec autorepeat handling to rc-core

CEC autorepeat is different than other protocols. Autorepeat is triggered
by the first repeated user control pressed CEC message, rather than a
fixed REP_DELAY.

This change also does away with the KEY_UP event directly after the first
KEY_DOWN event, which was used to stop autorepeat from starting.

See commit a9a249a2c9 ("media: cec: fix remote control passthrough")
for the original change.

Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/cec/cec-adap.c

@@ -1788,9 +1788,6 @@ static int cec_receive_notify(struct cec_adapter *adap, struct cec_msg *msg,
 	int la_idx = cec_log_addr2idx(adap, dest_laddr);
 	bool from_unregistered = init_laddr == 0xf;
 	struct cec_msg tx_cec_msg = { };
-#ifdef CONFIG_MEDIA_CEC_RC
-	int scancode;
-#endif
 
 	dprintk(2, "%s: %*ph\n", __func__, msg->len, msg->msg);
 
@@ -1886,9 +1883,11 @@ static int cec_receive_notify(struct cec_adapter *adap, struct cec_msg *msg,
 		 */
 		case 0x60:
 			if (msg->len == 2)
-				scancode = msg->msg[2];
+				rc_keydown(adap->rc, RC_PROTO_CEC,
+					   msg->msg[2], 0);
 			else
-				scancode = msg->msg[2] << 8 | msg->msg[3];
+				rc_keydown(adap->rc, RC_PROTO_CEC,
+					   msg->msg[2] << 8 | msg->msg[3], 0);
 			break;
 		/*
 		 * Other function messages that are not handled.
@@ -1901,54 +1900,11 @@ static int cec_receive_notify(struct cec_adapter *adap, struct cec_msg *msg,
 		 */
 		case 0x56: case 0x57:
 		case 0x67: case 0x68: case 0x69: case 0x6a:
-			scancode = -1;
 			break;
 		default:
-			scancode = msg->msg[2];
+			rc_keydown(adap->rc, RC_PROTO_CEC, msg->msg[2], 0);
 			break;
 		}
-
-		/* Was repeating, but keypress timed out */
-		if (adap->rc_repeating && !adap->rc->keypressed) {
-			adap->rc_repeating = false;
-			adap->rc_last_scancode = -1;
-		}
-		/* Different keypress from last time, ends repeat mode */
-		if (adap->rc_last_scancode != scancode) {
-			rc_keyup(adap->rc);
-			adap->rc_repeating = false;
-		}
-		/* We can't handle this scancode */
-		if (scancode < 0) {
-			adap->rc_last_scancode = scancode;
-			break;
-		}
-
-		/* Send key press */
-		rc_keydown(adap->rc, RC_PROTO_CEC, scancode, 0);
-
-		/* When in repeating mode, we're done */
-		if (adap->rc_repeating)
-			break;
-
-		/*
-		 * We are not repeating, but the new scancode is
-		 * the same as the last one, and this second key press is
-		 * within 550 ms (the 'Follower Safety Timeout') from the
-		 * previous key press, so we now enable the repeating mode.
-		 */
-		if (adap->rc_last_scancode == scancode &&
-		    msg->rx_ts - adap->rc_last_keypress < 550 * NSEC_PER_MSEC) {
-			adap->rc_repeating = true;
-			break;
-		}
-		/*
-		 * Not in repeating mode, so avoid triggering repeat mode
-		 * by calling keyup.
-		 */
-		rc_keyup(adap->rc);
-		adap->rc_last_scancode = scancode;
-		adap->rc_last_keypress = msg->rx_ts;
 #endif
 		break;
 
@@ -1958,8 +1914,6 @@ static int cec_receive_notify(struct cec_adapter *adap, struct cec_msg *msg,
 			break;
 #ifdef CONFIG_MEDIA_CEC_RC
 		rc_keyup(adap->rc);
-		adap->rc_repeating = false;
-		adap->rc_last_scancode = -1;
 #endif
 		break;
 

drivers/media/cec/cec-core.c

@@ -286,7 +286,6 @@ struct cec_adapter *cec_allocate_adapter(const struct cec_adap_ops *ops,
 	adap->rc->priv = adap;
 	adap->rc->map_name = RC_MAP_CEC;
 	adap->rc->timeout = MS_TO_NS(100);
-	adap->rc_last_scancode = -1;
 #endif
 	return adap;
 }
@@ -318,17 +317,6 @@ int cec_register_adapter(struct cec_adapter *adap,
 			adap->rc = NULL;
 			return res;
 		}
-		/*
-		 * The REP_DELAY for CEC is really the time between the initial
-		 * 'User Control Pressed' message and the second. The first
-		 * keypress is always seen as non-repeating, the second
-		 * (provided it has the same UI Command) will start the 'Press
-		 * and Hold' (aka repeat) behavior. By setting REP_DELAY to the
-		 * same value as REP_PERIOD the expected CEC behavior is
-		 * reproduced.
-		 */
-		adap->rc->input_dev->rep[REP_DELAY] =
-			adap->rc->input_dev->rep[REP_PERIOD];
 	}
 #endif
 

drivers/media/rc/rc-main.c

@@ -597,6 +597,7 @@ static void ir_do_keyup(struct rc_dev *dev, bool sync)
 		return;
 
 	IR_dprintk(1, "keyup key 0x%04x\n", dev->last_keycode);
+	del_timer_sync(&dev->timer_repeat);
 	input_report_key(dev->input_dev, dev->last_keycode, 0);
 	led_trigger_event(led_feedback, LED_OFF);
 	if (sync)
@@ -650,6 +651,31 @@ static void ir_timer_keyup(struct timer_list *t)
 	spin_unlock_irqrestore(&dev->keylock, flags);
 }
 
+/**
+ * ir_timer_repeat() - generates a repeat event after a timeout
+ *
+ * @t:		a pointer to the struct timer_list
+ *
+ * This routine will generate a soft repeat event every REP_PERIOD
+ * milliseconds.
+ */
+static void ir_timer_repeat(struct timer_list *t)
+{
+	struct rc_dev *dev = from_timer(dev, t, timer_repeat);
+	struct input_dev *input = dev->input_dev;
+	unsigned long flags;
+
+	spin_lock_irqsave(&dev->keylock, flags);
+	if (dev->keypressed) {
+		input_event(input, EV_KEY, dev->last_keycode, 2);
+		input_sync(input);
+		if (input->rep[REP_PERIOD])
+			mod_timer(&dev->timer_repeat, jiffies +
+				  msecs_to_jiffies(input->rep[REP_PERIOD]));
+	}
+	spin_unlock_irqrestore(&dev->keylock, flags);
+}
+
 /**
  * rc_repeat() - signals that a key is still pressed
  * @dev:	the struct rc_dev descriptor of the device
@@ -732,6 +758,22 @@ static void ir_do_keydown(struct rc_dev *dev, enum rc_proto protocol,
 		led_trigger_event(led_feedback, LED_FULL);
 	}
 
+	/*
+	 * For CEC, start sending repeat messages as soon as the first
+	 * repeated message is sent, as long as REP_DELAY = 0 and REP_PERIOD
+	 * is non-zero. Otherwise, the input layer will generate repeat
+	 * messages.
+	 */
+	if (!new_event && keycode != KEY_RESERVED &&
+	    dev->allowed_protocols == RC_PROTO_BIT_CEC &&
+	    !timer_pending(&dev->timer_repeat) &&
+	    dev->input_dev->rep[REP_PERIOD] &&
+	    !dev->input_dev->rep[REP_DELAY]) {
+		input_event(dev->input_dev, EV_KEY, keycode, 2);
+		mod_timer(&dev->timer_repeat, jiffies +
+			  msecs_to_jiffies(dev->input_dev->rep[REP_PERIOD]));
+	}
+
 	input_sync(dev->input_dev);
 }
 
@@ -1599,6 +1641,7 @@ struct rc_dev *rc_allocate_device(enum rc_driver_type type)
 		input_set_drvdata(dev->input_dev, dev);
 
 		timer_setup(&dev->timer_keyup, ir_timer_keyup, 0);
+		timer_setup(&dev->timer_repeat, ir_timer_repeat, 0);
 
 		spin_lock_init(&dev->rc_map.lock);
 		spin_lock_init(&dev->keylock);
@@ -1732,7 +1775,10 @@ static int rc_setup_rx_device(struct rc_dev *dev)
 	 * to avoid wrong repetition of the keycodes. Note that this must be
 	 * set after the call to input_register_device().
 	 */
-	dev->input_dev->rep[REP_DELAY] = 500;
+	if (dev->allowed_protocols == RC_PROTO_BIT_CEC)
+		dev->input_dev->rep[REP_DELAY] = 0;
+	else
+		dev->input_dev->rep[REP_DELAY] = 500;
 
 	/*
 	 * As a repeat event on protocols like RC-5 and NEC take as long as
@@ -1884,6 +1930,7 @@ void rc_unregister_device(struct rc_dev *dev)
 		return;
 
 	del_timer_sync(&dev->timer_keyup);
+	del_timer_sync(&dev->timer_repeat);
 
 	if (dev->driver_type == RC_DRIVER_IR_RAW)
 		ir_raw_event_unregister(dev);

include/media/cec.h

@@ -192,11 +192,6 @@ struct cec_adapter {
 
 	u32 tx_timeouts;
 
-#ifdef CONFIG_MEDIA_CEC_RC
-	bool rc_repeating;
-	int rc_last_scancode;
-	u64 rc_last_keypress;
-#endif
 #ifdef CONFIG_CEC_NOTIFIER
 	struct cec_notifier *notifier;
 #endif

include/media/rc-core.h

@@ -134,6 +134,8 @@ struct lirc_fh {
  * @keypressed: whether a key is currently pressed
  * @keyup_jiffies: time (in jiffies) when the current keypress should be released
  * @timer_keyup: timer for releasing a keypress
+ * @timer_repeat: timer for autorepeat events. This is needed for CEC, which
+ *	has non-standard repeats.
  * @last_keycode: keycode of last keypress
  * @last_protocol: protocol of last keypress
  * @last_scancode: scancode of last keypress
@@ -202,6 +204,7 @@ struct rc_dev {
 	bool				keypressed;
 	unsigned long			keyup_jiffies;
 	struct timer_list		timer_keyup;
+	struct timer_list		timer_repeat;
 	u32				last_keycode;
 	enum rc_proto			last_protocol;
 	u32				last_scancode;