linux-kernel - [PATCH v3] [media] rc-core: fix protocol_change regression in ir_raw_event

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Date:	Tue, 28 Oct 2014 20:43:14 +0200
From:	Tomas Melin <tomas.melin@....fi>
To:	m.chehab@...sung.com
Cc:	david@...deman.nu, james.hogan@...tec.com, a.seppala@...il.com,
	bay@...kerdom.ru, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org, Tomas Melin <tomas.melin@....fi>
Subject: [PATCH v3] [media] rc-core: fix protocol_change regression in ir_raw_event_register

IR receiver using nuvoton-cir and lirc required additional configuration
steps after upgrade from kernel 3.16 to 3.17-rcX.
Bisected regression to commit da6e162d6a4607362f8478c715c797d84d449f8b
("[media] rc-core: simplify sysfs code").

The regression comes from adding function change_protocol in
ir-raw.c. It changes behaviour so that only the protocol enabled by driver's
map_name will be active after registration. This breaks user space behaviour,
lirc does not get key press signals anymore.

Enable lirc protocol by default for ir raw decoders to restore original behaviour.

Signed-off-by: Tomas Melin <tomas.melin@....fi>
---
 drivers/media/rc/rc-ir-raw.c |    1 -
 drivers/media/rc/rc-main.c   |    2 ++
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/media/rc/rc-ir-raw.c b/drivers/media/rc/rc-ir-raw.c
index e8fff2a..b732ac6 100644
--- a/drivers/media/rc/rc-ir-raw.c
+++ b/drivers/media/rc/rc-ir-raw.c
@@ -262,7 +262,6 @@ int ir_raw_event_register(struct rc_dev *dev)
 		return -ENOMEM;
 
 	dev->raw->dev = dev;
-	dev->enabled_protocols = ~0;
 	dev->change_protocol = change_protocol;
 	rc = kfifo_alloc(&dev->raw->kfifo,
 			 sizeof(struct ir_raw_event) * MAX_IR_EVENT_SIZE,
diff --git a/drivers/media/rc/rc-main.c b/drivers/media/rc/rc-main.c
index a7991c7..8d3b74c 100644
--- a/drivers/media/rc/rc-main.c
+++ b/drivers/media/rc/rc-main.c
@@ -1421,6 +1421,8 @@ int rc_register_device(struct rc_dev *dev)
 
 	if (dev->change_protocol) {
 		u64 rc_type = (1 << rc_map->rc_type);
+		if (dev->driver_type == RC_DRIVER_IR_RAW)
+			rc_type |= RC_BIT_LIRC;
 		rc = dev->change_protocol(dev, &rc_type);
 		if (rc < 0)
 			goto out_raw;
-- 
1.7.10.4

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