From 00942d1a1bd93ac108c1b92d504c568a37be1833 Mon Sep 17 00:00:00 2001
From: James Hogan <james.hogan@imgtec.com>
Date: Fri, 17 Jan 2014 10:58:49 -0300
Subject: [PATCH] [media] media: rc: add sysfs scancode filtering interface

Add and document a generic sysfs based scancode filtering interface for
making use of IR data matching hardware to filter out uninteresting
scancodes. Two filters exist, one for normal operation and one for
filtering scancodes which are permitted to wake the system from suspend.

The following files are added to /sys/class/rc/rc?/:
 - filter: normal scancode filter value
 - filter_mask: normal scancode filter mask
 - wakeup_filter: wakeup scancode filter value
 - wakeup_filter_mask: wakeup scancode filter mask

A new s_filter() driver callback is added which must arrange for the
specified filter to be applied at the right time. Drivers can convert
the scancode filter into a raw IR data filter, which can be applied
immediately or later (for wake up filters).

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Mauro Carvalho Chehab <m.chehab@samsung.com>
Cc: linux-media@vger.kernel.org
Cc: Rob Landley <rob@landley.net>
Cc: linux-doc@vger.kernel.org
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
---
 Documentation/ABI/testing/sysfs-class-rc |  58 +++++++++++++
 drivers/media/rc/rc-main.c               | 136 +++++++++++++++++++++++++++++++
 include/media/rc-core.h                  |  29 +++++++
 3 files changed, 223 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-class-rc b/Documentation/ABI/testing/sysfs-class-rc
index 52bc057..c0e1d14 100644
diff --git a/drivers/media/rc/rc-main.c b/drivers/media/rc/rc-main.c
index f1b67db..fa8b957 100644
--- a/drivers/media/rc/rc-main.c
+++ b/drivers/media/rc/rc-main.c
@@ -969,6 +969,130 @@ static ssize_t store_protocols(struct device *device,
 	return ret;
 }
 
+/**
+ * struct rc_filter_attribute - Device attribute relating to a filter type.
+ * @attr:	Device attribute.
+ * @type:	Filter type.
+ * @mask:	false for filter value, true for filter mask.
+ */
+struct rc_filter_attribute {
+	struct device_attribute		attr;
+	enum rc_filter_type		type;
+	bool				mask;
+};
+#define to_rc_filter_attr(a) container_of(a, struct rc_filter_attribute, attr)
+
+#define RC_FILTER_ATTR(_name, _mode, _show, _store, _type, _mask)	\
+	struct rc_filter_attribute dev_attr_##_name = {			\
+		.attr = __ATTR(_name, _mode, _show, _store),		\
+		.type = (_type),					\
+		.mask = (_mask),					\
+	}
+
+/**
+ * show_filter() - shows the current scancode filter value or mask
+ * @device:	the device descriptor
+ * @attr:	the device attribute struct
+ * @buf:	a pointer to the output buffer
+ *
+ * This routine is a callback routine to read a scancode filter value or mask.
+ * It is trigged by reading /sys/class/rc/rc?/[wakeup_]filter[_mask].
+ * It prints the current scancode filter value or mask of the appropriate filter
+ * type in hexadecimal into @buf and returns the size of the buffer.
+ *
+ * Bits of the filter value corresponding to set bits in the filter mask are
+ * compared against input scancodes and non-matching scancodes are discarded.
+ *
+ * dev->lock is taken to guard against races between device registration,
+ * store_filter and show_filter.
+ */
+static ssize_t show_filter(struct device *device,
+			   struct device_attribute *attr,
+			   char *buf)
+{
+	struct rc_dev *dev = to_rc_dev(device);
+	struct rc_filter_attribute *fattr = to_rc_filter_attr(attr);
+	u32 val;
+
+	/* Device is being removed */
+	if (!dev)
+		return -EINVAL;
+
+	mutex_lock(&dev->lock);
+	if (!dev->s_filter)
+		val = 0;
+	else if (fattr->mask)
+		val = dev->scancode_filters[fattr->type].mask;
+	else
+		val = dev->scancode_filters[fattr->type].data;
+	mutex_unlock(&dev->lock);
+
+	return sprintf(buf, "%#x\n", val);
+}
+
+/**
+ * store_filter() - changes the scancode filter value
+ * @device:	the device descriptor
+ * @attr:	the device attribute struct
+ * @buf:	a pointer to the input buffer
+ * @len:	length of the input buffer
+ *
+ * This routine is for changing a scancode filter value or mask.
+ * It is trigged by writing to /sys/class/rc/rc?/[wakeup_]filter[_mask].
+ * Returns -EINVAL if an invalid filter value for the current protocol was
+ * specified or if scancode filtering is not supported by the driver, otherwise
+ * returns @len.
+ *
+ * Bits of the filter value corresponding to set bits in the filter mask are
+ * compared against input scancodes and non-matching scancodes are discarded.
+ *
+ * dev->lock is taken to guard against races between device registration,
+ * store_filter and show_filter.
+ */
+static ssize_t store_filter(struct device *device,
+			    struct device_attribute *attr,
+			    const char *buf,
+			    size_t count)
+{
+	struct rc_dev *dev = to_rc_dev(device);
+	struct rc_filter_attribute *fattr = to_rc_filter_attr(attr);
+	struct rc_scancode_filter local_filter, *filter;
+	int ret;
+	unsigned long val;
+
+	/* Device is being removed */
+	if (!dev)
+		return -EINVAL;
+
+	ret = kstrtoul(buf, 0, &val);
+	if (ret < 0)
+		return ret;
+
+	/* Scancode filter not supported (but still accept 0) */
+	if (!dev->s_filter)
+		return val ? -EINVAL : count;
+
+	mutex_lock(&dev->lock);
+
+	/* Tell the driver about the new filter */
+	filter = &dev->scancode_filters[fattr->type];
+	local_filter = *filter;
+	if (fattr->mask)
+		local_filter.mask = val;
+	else
+		local_filter.data = val;
+	ret = dev->s_filter(dev, fattr->type, &local_filter);
+	if (ret < 0)
+		goto unlock;
+
+	/* Success, commit the new filter */
+	*filter = local_filter;
+
+unlock:
+	mutex_unlock(&dev->lock);
+	return count;
+}
+
 static void rc_dev_release(struct device *device)
 {
 }
@@ -1000,9 +1124,21 @@ static int rc_dev_uevent(struct device *device, struct kobj_uevent_env *env)
  */
 static DEVICE_ATTR(protocols, S_IRUGO | S_IWUSR,
 		   show_protocols, store_protocols);
+static RC_FILTER_ATTR(filter, S_IRUGO|S_IWUSR,
+		      show_filter, store_filter, RC_FILTER_NORMAL, false);
+static RC_FILTER_ATTR(filter_mask, S_IRUGO|S_IWUSR,
+		      show_filter, store_filter, RC_FILTER_NORMAL, true);
+static RC_FILTER_ATTR(wakeup_filter, S_IRUGO|S_IWUSR,
+		      show_filter, store_filter, RC_FILTER_WAKEUP, false);
+static RC_FILTER_ATTR(wakeup_filter_mask, S_IRUGO|S_IWUSR,
+		      show_filter, store_filter, RC_FILTER_WAKEUP, true);
 
 static struct attribute *rc_dev_attrs[] = {
 	&dev_attr_protocols.attr,
+	&dev_attr_filter.attr.attr,
+	&dev_attr_filter_mask.attr.attr,
+	&dev_attr_wakeup_filter.attr.attr,
+	&dev_attr_wakeup_filter_mask.attr.attr,
 	NULL,
 };
 
diff --git a/include/media/rc-core.h b/include/media/rc-core.h
index 2f6f1f7..4a72176 100644
--- a/include/media/rc-core.h
+++ b/include/media/rc-core.h
@@ -35,6 +35,29 @@ enum rc_driver_type {
 };
 
 /**
+ * struct rc_scancode_filter - Filter scan codes.
+ * @data:	Scancode data to match.
+ * @mask:	Mask of bits of scancode to compare.
+ */
+struct rc_scancode_filter {
+	u32 data;
+	u32 mask;
+};
+
+/**
+ * enum rc_filter_type - Filter type constants.
+ * @RC_FILTER_NORMAL:	Filter for normal operation.
+ * @RC_FILTER_WAKEUP:	Filter for waking from suspend.
+ * @RC_FILTER_MAX:	Number of filter types.
+ */
+enum rc_filter_type {
+	RC_FILTER_NORMAL = 0,
+	RC_FILTER_WAKEUP,
+
+	RC_FILTER_MAX
+};
+
+/**
  * struct rc_dev - represents a remote control device
  * @dev: driver model's view of this device
  * @input_name: name of the input child device
@@ -70,6 +93,7 @@ enum rc_driver_type {
  * @max_timeout: maximum timeout supported by device
  * @rx_resolution : resolution (in ns) of input sampler
  * @tx_resolution: resolution (in ns) of output sampler
+ * @scancode_filters: scancode filters (indexed by enum rc_filter_type)
  * @change_protocol: allow changing the protocol used on hardware decoders
  * @open: callback to allow drivers to enable polling/irq when IR input device
  *	is opened.
@@ -84,6 +108,7 @@ enum rc_driver_type {
  *	device doesn't interrupt host until it sees IR pulses
  * @s_learning_mode: enable wide band receiver used for learning
  * @s_carrier_report: enable carrier reports
+ * @s_filter: set the scancode filter of a given type
  */
 struct rc_dev {
 	struct device			dev;
@@ -116,6 +141,7 @@ struct rc_dev {
 	u32				max_timeout;
 	u32				rx_resolution;
 	u32				tx_resolution;
+	struct rc_scancode_filter	scancode_filters[RC_FILTER_MAX];
 	int				(*change_protocol)(struct rc_dev *dev, u64 *rc_type);
 	int				(*open)(struct rc_dev *dev);
 	void				(*close)(struct rc_dev *dev);
@@ -127,6 +153,9 @@ struct rc_dev {
 	void				(*s_idle)(struct rc_dev *dev, bool enable);
 	int				(*s_learning_mode)(struct rc_dev *dev, int enable);
 	int				(*s_carrier_report) (struct rc_dev *dev, int enable);
+	int				(*s_filter)(struct rc_dev *dev,
+						    enum rc_filter_type type,
+						    struct rc_scancode_filter *filter);
 };
 
 #define to_rc_dev(d) container_of(d, struct rc_dev, dev)
From 7b802ce7e8c67510389fdbbe29edd87a75df3a93 Mon Sep 17 00:00:00 2001
From: James Hogan <james.hogan@imgtec.com>
Date: Mon, 10 Feb 2014 18:31:56 -0300
Subject: [PATCH] [media] rc-main: store_filter: pass errors to userland
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Propagate errors returned by drivers from the s_filter callback back to
userland when updating scancode filters. This allows userland to see
when the filter couldn't be updated, usually because it's not a valid
filter for the hardware.

Previously the filter was being updated conditionally on success of
s_filter, but the write always reported success back to userland.

Reported-by: Antti Seppälä <a.seppala@gmail.com>
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
---
 drivers/media/rc/rc-main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/rc/rc-main.c b/drivers/media/rc/rc-main.c
index 2ec60f8..6448128 100644
--- a/drivers/media/rc/rc-main.c
+++ b/drivers/media/rc/rc-main.c
@@ -1090,7 +1090,7 @@ static ssize_t store_filter(struct device *device,
 
 unlock:
 	mutex_unlock(&dev->lock);
-	return count;
+	return (ret < 0) ? ret : count;
 }
 
 static void rc_dev_release(struct device *device)
From b8c7d915087c97a21fa415fa0e860e59739da202 Mon Sep 17 00:00:00 2001
From: James Hogan <james.hogan@imgtec.com>
Date: Fri, 28 Feb 2014 20:17:02 -0300
Subject: [PATCH] [media] rc-main: add generic scancode filtering
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Add generic scancode filtering of RC input events, and fall back to
permitting any RC_FILTER_NORMAL scancode filter to be set if no s_filter
callback exists. This allows raw IR decoder events to be filtered, and
potentially allows hardware decoders to set looser filters and rely on
generic code to filter out the corner cases.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Reviewed-by: Antti Seppälä <a.seppala@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
---
 drivers/media/rc/rc-main.c | 20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

diff --git a/drivers/media/rc/rc-main.c b/drivers/media/rc/rc-main.c
index 6448128..0a4f680f 100644
--- a/drivers/media/rc/rc-main.c
+++ b/drivers/media/rc/rc-main.c
@@ -633,6 +633,7 @@ EXPORT_SYMBOL_GPL(rc_repeat);
 static void ir_do_keydown(struct rc_dev *dev, int scancode,
 			  u32 keycode, u8 toggle)
 {
+	struct rc_scancode_filter *filter;
 	bool new_event = !dev->keypressed ||
 			 dev->last_scancode != scancode ||
 			 dev->last_toggle != toggle;
@@ -640,6 +641,11 @@ static void ir_do_keydown(struct rc_dev *dev, int scancode,
 	if (new_event && dev->keypressed)
 		ir_do_keyup(dev, false);
 
+	/* Generic scancode filtering */
+	filter = &dev->scancode_filters[RC_FILTER_NORMAL];
+	if (filter->mask && ((scancode ^ filter->data) & filter->mask))
+		return;
+
 	input_event(dev->input_dev, EV_MSC, MSC_SCAN, scancode);
 
 	if (new_event && keycode != KEY_RESERVED) {
@@ -1019,9 +1025,7 @@ static ssize_t show_filter(struct device *device,
 		return -EINVAL;
 
 	mutex_lock(&dev->lock);
-	if (!dev->s_filter)
-		val = 0;
-	else if (fattr->mask)
+	if (fattr->mask)
 		val = dev->scancode_filters[fattr->type].mask;
 	else
 		val = dev->scancode_filters[fattr->type].data;
@@ -1069,7 +1073,7 @@ static ssize_t store_filter(struct device *device,
 		return ret;
 
 	/* Scancode filter not supported (but still accept 0) */
-	if (!dev->s_filter)
+	if (!dev->s_filter && fattr->type != RC_FILTER_NORMAL)
 		return val ? -EINVAL : count;
 
 	mutex_lock(&dev->lock);
@@ -1081,9 +1085,11 @@ static ssize_t store_filter(struct device *device,
 		local_filter.mask = val;
 	else
 		local_filter.data = val;
-	ret = dev->s_filter(dev, fattr->type, &local_filter);
-	if (ret < 0)
-		goto unlock;
+	if (dev->s_filter) {
+		ret = dev->s_filter(dev, fattr->type, &local_filter);
+		if (ret < 0)
+			goto unlock;
+	}
 
 	/* Success, commit the new filter */
 	*filter = local_filter;
From 1a1934fab0c920f0d3bceeb60c9fe2dae8a56be9 Mon Sep 17 00:00:00 2001
From: James Hogan <james.hogan@imgtec.com>
Date: Fri, 28 Feb 2014 20:17:03 -0300
Subject: [PATCH] [media] rc: abstract access to allowed/enabled protocols
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The allowed and enabled protocol masks need to be expanded to be per
filter type in order to support wakeup filter protocol selection. To
ease that process abstract access to the rc_dev::allowed_protos and
rc_dev::enabled_protocols members with inline functions.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Reviewed-by: Antti Seppälä <a.seppala@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
---
 drivers/hid/hid-picolcd_cir.c               |  2 +-
 drivers/media/common/siano/smsir.c          |  2 +-
 drivers/media/i2c/ir-kbd-i2c.c              |  4 ++--
 drivers/media/pci/cx23885/cx23885-input.c   |  2 +-
 drivers/media/pci/cx88/cx88-input.c         |  2 +-
 drivers/media/rc/ati_remote.c               |  2 +-
 drivers/media/rc/ene_ir.c                   |  2 +-
 drivers/media/rc/fintek-cir.c               |  2 +-
 drivers/media/rc/gpio-ir-recv.c             |  4 ++--
 drivers/media/rc/iguanair.c                 |  2 +-
 drivers/media/rc/imon.c                     |  7 ++++---
 drivers/media/rc/ir-jvc-decoder.c           |  2 +-
 drivers/media/rc/ir-lirc-codec.c            |  2 +-
 drivers/media/rc/ir-mce_kbd-decoder.c       |  2 +-
 drivers/media/rc/ir-nec-decoder.c           |  2 +-
 drivers/media/rc/ir-raw.c                   |  2 +-
 drivers/media/rc/ir-rc5-decoder.c           |  6 +++---
 drivers/media/rc/ir-rc5-sz-decoder.c        |  2 +-
 drivers/media/rc/ir-rc6-decoder.c           |  6 +++---
 drivers/media/rc/ir-sanyo-decoder.c         |  2 +-
 drivers/media/rc/ir-sharp-decoder.c         |  2 +-
 drivers/media/rc/ir-sony-decoder.c          | 10 +++++-----
 drivers/media/rc/ite-cir.c                  |  2 +-
 drivers/media/rc/mceusb.c                   |  2 +-
 drivers/media/rc/nuvoton-cir.c              |  2 +-
 drivers/media/rc/rc-loopback.c              |  2 +-
 drivers/media/rc/redrat3.c                  |  2 +-
 drivers/media/rc/st_rc.c                    |  2 +-
 drivers/media/rc/streamzap.c                |  2 +-
 drivers/media/rc/ttusbir.c                  |  2 +-
 drivers/media/rc/winbond-cir.c              |  2 +-
 drivers/media/usb/dvb-usb-v2/dvb_usb_core.c |  2 +-
 drivers/media/usb/dvb-usb/dvb-usb-remote.c  |  2 +-
 drivers/media/usb/em28xx/em28xx-input.c     |  8 ++++----
 drivers/media/usb/tm6000/tm6000-input.c     |  2 +-
 include/media/rc-core.h                     | 22 ++++++++++++++++++++++
 36 files changed, 73 insertions(+), 50 deletions(-)

diff --git a/drivers/hid/hid-picolcd_cir.c b/drivers/hid/hid-picolcd_cir.c
index 59d5eb1..cf1a9f1 100644
--- a/drivers/hid/hid-picolcd_cir.c
+++ b/drivers/hid/hid-picolcd_cir.c
@@ -114,7 +114,7 @@ int picolcd_init_cir(struct picolcd_data *data, struct hid_report *report)
 
 	rdev->priv             = data;
 	rdev->driver_type      = RC_DRIVER_IR_RAW;
-	rdev->allowed_protos   = RC_BIT_ALL;
+	rc_set_allowed_protocols(rdev, RC_BIT_ALL);
 	rdev->open             = picolcd_cir_open;
 	rdev->close            = picolcd_cir_close;
 	rdev->input_name       = data->hdev->name;
diff --git a/drivers/media/common/siano/smsir.c b/drivers/media/common/siano/smsir.c
index b8c5cad..6d7c0c8 100644
--- a/drivers/media/common/siano/smsir.c
+++ b/drivers/media/common/siano/smsir.c
@@ -88,7 +88,7 @@ int sms_ir_init(struct smscore_device_t *coredev)
 
 	dev->priv = coredev;
 	dev->driver_type = RC_DRIVER_IR_RAW;
-	dev->allowed_protos = RC_BIT_ALL;
+	rc_set_allowed_protocols(dev, RC_BIT_ALL);
 	dev->map_name = sms_get_board(board_id)->rc_codes;
 	dev->driver_name = MODULE_NAME;
 
diff --git a/drivers/media/i2c/ir-kbd-i2c.c b/drivers/media/i2c/ir-kbd-i2c.c
index 99ee456..c8fe135 100644
--- a/drivers/media/i2c/ir-kbd-i2c.c
+++ b/drivers/media/i2c/ir-kbd-i2c.c
@@ -431,8 +431,8 @@ static int ir_probe(struct i2c_client *client, const struct i2c_device_id *id)
 	 * Initialize the other fields of rc_dev
 	 */
 	rc->map_name       = ir->ir_codes;
-	rc->allowed_protos = rc_type;
-	rc->enabled_protocols = rc_type;
+	rc_set_allowed_protocols(rc, rc_type);
+	rc_set_enabled_protocols(rc, rc_type);
 	if (!rc->driver_name)
 		rc->driver_name = MODULE_NAME;
 
diff --git a/drivers/media/pci/cx23885/cx23885-input.c b/drivers/media/pci/cx23885/cx23885-input.c
index 8a49e7c..097d0a0 100644
--- a/drivers/media/pci/cx23885/cx23885-input.c
+++ b/drivers/media/pci/cx23885/cx23885-input.c
@@ -346,7 +346,7 @@ int cx23885_input_init(struct cx23885_dev *dev)
 	}
 	rc->dev.parent = &dev->pci->dev;
 	rc->driver_type = driver_type;
-	rc->allowed_protos = allowed_protos;
+	rc_set_allowed_protocols(rc, allowed_protos);
 	rc->priv = kernel_ir;
 	rc->open = cx23885_input_ir_open;
 	rc->close = cx23885_input_ir_close;
diff --git a/drivers/media/pci/cx88/cx88-input.c b/drivers/media/pci/cx88/cx88-input.c
index f29e18c..f991696 100644
--- a/drivers/media/pci/cx88/cx88-input.c
+++ b/drivers/media/pci/cx88/cx88-input.c
@@ -469,7 +469,7 @@ int cx88_ir_init(struct cx88_core *core, struct pci_dev *pci)
 		dev->timeout = 10 * 1000 * 1000; /* 10 ms */
 	} else {
 		dev->driver_type = RC_DRIVER_SCANCODE;
-		dev->allowed_protos = rc_type;
+		rc_set_allowed_protocols(dev, rc_type);
 	}
 
 	ir->core = core;
diff --git a/drivers/media/rc/ati_remote.c b/drivers/media/rc/ati_remote.c
index 4d6a63f..2df7c55 100644
--- a/drivers/media/rc/ati_remote.c
+++ b/drivers/media/rc/ati_remote.c
@@ -784,7 +784,7 @@ static void ati_remote_rc_init(struct ati_remote *ati_remote)
 
 	rdev->priv = ati_remote;
 	rdev->driver_type = RC_DRIVER_SCANCODE;
-	rdev->allowed_protos = RC_BIT_OTHER;
+	rc_set_allowed_protocols(rdev, RC_BIT_OTHER);
 	rdev->driver_name = "ati_remote";
 
 	rdev->open = ati_remote_rc_open;
diff --git a/drivers/media/rc/ene_ir.c b/drivers/media/rc/ene_ir.c
index c1444f8..fc9d23f 100644
--- a/drivers/media/rc/ene_ir.c
+++ b/drivers/media/rc/ene_ir.c
@@ -1059,7 +1059,7 @@ static int ene_probe(struct pnp_dev *pnp_dev, const struct pnp_device_id *id)
 		learning_mode_force = false;
 
 	rdev->driver_type = RC_DRIVER_IR_RAW;
-	rdev->allowed_protos = RC_BIT_ALL;
+	rc_set_allowed_protocols(rdev, RC_BIT_ALL);
 	rdev->priv = dev;
 	rdev->open = ene_open;
 	rdev->close = ene_close;
diff --git a/drivers/media/rc/fintek-cir.c b/drivers/media/rc/fintek-cir.c
index d6fa441..46b66e5 100644
--- a/drivers/media/rc/fintek-cir.c
+++ b/drivers/media/rc/fintek-cir.c
@@ -541,7 +541,7 @@ static int fintek_probe(struct pnp_dev *pdev, const struct pnp_device_id *dev_id
 	/* Set up the rc device */
 	rdev->priv = fintek;
 	rdev->driver_type = RC_DRIVER_IR_RAW;
-	rdev->allowed_protos = RC_BIT_ALL;
+	rc_set_allowed_protocols(rdev, RC_BIT_ALL);
 	rdev->open = fintek_open;
 	rdev->close = fintek_close;
 	rdev->input_name = FINTEK_DESCRIPTION;
diff --git a/drivers/media/rc/gpio-ir-recv.c b/drivers/media/rc/gpio-ir-recv.c
index 80c611c..29b5f89 100644
--- a/drivers/media/rc/gpio-ir-recv.c
+++ b/drivers/media/rc/gpio-ir-recv.c
@@ -145,9 +145,9 @@ static int gpio_ir_recv_probe(struct platform_device *pdev)
 	rcdev->dev.parent = &pdev->dev;
 	rcdev->driver_name = GPIO_IR_DRIVER_NAME;
 	if (pdata->allowed_protos)
-		rcdev->allowed_protos = pdata->allowed_protos;
+		rc_set_allowed_protocols(rcdev, pdata->allowed_protos);
 	else
-		rcdev->allowed_protos = RC_BIT_ALL;
+		rc_set_allowed_protocols(rcdev, RC_BIT_ALL);
 	rcdev->map_name = pdata->map_name ?: RC_MAP_EMPTY;
 
 	gpio_dev->rcdev = rcdev;
diff --git a/drivers/media/rc/iguanair.c b/drivers/media/rc/iguanair.c
index a83519a..627ddfd 100644
--- a/drivers/media/rc/iguanair.c
+++ b/drivers/media/rc/iguanair.c
@@ -495,7 +495,7 @@ static int iguanair_probe(struct usb_interface *intf,
 	usb_to_input_id(ir->udev, &rc->input_id);
 	rc->dev.parent = &intf->dev;
 	rc->driver_type = RC_DRIVER_IR_RAW;
-	rc->allowed_protos = RC_BIT_ALL;
+	rc_set_allowed_protocols(rc, RC_BIT_ALL);
 	rc->priv = ir;
 	rc->open = iguanair_open;
 	rc->close = iguanair_close;
diff --git a/drivers/media/rc/imon.c b/drivers/media/rc/imon.c
index 822b9f4..6f24e77 100644
--- a/drivers/media/rc/imon.c
+++ b/drivers/media/rc/imon.c
@@ -1017,7 +1017,7 @@ static int imon_ir_change_protocol(struct rc_dev *rc, u64 *rc_type)
 	unsigned char ir_proto_packet[] = {
 		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x86 };
 
-	if (*rc_type && !(*rc_type & rc->allowed_protos))
+	if (*rc_type && !rc_protocols_allowed(rc, *rc_type))
 		dev_warn(dev, "Looks like you're trying to use an IR protocol "
 			 "this device does not support\n");
 
@@ -1867,7 +1867,8 @@ static struct rc_dev *imon_init_rdev(struct imon_context *ictx)
 
 	rdev->priv = ictx;
 	rdev->driver_type = RC_DRIVER_SCANCODE;
-	rdev->allowed_protos = RC_BIT_OTHER | RC_BIT_RC6_MCE; /* iMON PAD or MCE */
+					/* iMON PAD or MCE */
+	rc_set_allowed_protocols(rdev, RC_BIT_OTHER | RC_BIT_RC6_MCE);
 	rdev->change_protocol = imon_ir_change_protocol;
 	rdev->driver_name = MOD_NAME;
 
@@ -1880,7 +1881,7 @@ static struct rc_dev *imon_init_rdev(struct imon_context *ictx)
 
 	if (ictx->product == 0xffdc) {
 		imon_get_ffdc_type(ictx);
-		rdev->allowed_protos = ictx->rc_type;
+		rc_set_allowed_protocols(rdev, ictx->rc_type);
 	}
 
 	imon_set_display_type(ictx);
diff --git a/drivers/media/rc/ir-jvc-decoder.c b/drivers/media/rc/ir-jvc-decoder.c
index 3948138..4ea62a1 100644
--- a/drivers/media/rc/ir-jvc-decoder.c
+++ b/drivers/media/rc/ir-jvc-decoder.c
@@ -47,7 +47,7 @@ static int ir_jvc_decode(struct rc_dev *dev, struct ir_raw_event ev)
 {
 	struct jvc_dec *data = &dev->raw->jvc;
 
-	if (!(dev->enabled_protocols & RC_BIT_JVC))
+	if (!rc_protocols_enabled(dev, RC_BIT_JVC))
 		return 0;
 
 	if (!is_timing_event(ev)) {
diff --git a/drivers/media/rc/ir-lirc-codec.c b/drivers/media/rc/ir-lirc-codec.c
index ed2c8a1..d731da6 100644
--- a/drivers/media/rc/ir-lirc-codec.c
+++ b/drivers/media/rc/ir-lirc-codec.c
@@ -35,7 +35,7 @@ static int ir_lirc_decode(struct rc_dev *dev, struct ir_raw_event ev)
 	struct lirc_codec *lirc = &dev->raw->lirc;
 	int sample;
 
-	if (!(dev->enabled_protocols & RC_BIT_LIRC))
+	if (!rc_protocols_enabled(dev, RC_BIT_LIRC))
 		return 0;
 
 	if (!dev->raw->lirc.drv || !dev->raw->lirc.drv->rbuf)
diff --git a/drivers/media/rc/ir-mce_kbd-decoder.c b/drivers/media/rc/ir-mce_kbd-decoder.c
index 9f3c9b5..0c55f79 100644
--- a/drivers/media/rc/ir-mce_kbd-decoder.c
+++ b/drivers/media/rc/ir-mce_kbd-decoder.c
@@ -216,7 +216,7 @@ static int ir_mce_kbd_decode(struct rc_dev *dev, struct ir_raw_event ev)
 	u32 scancode;
 	unsigned long delay;
 
-	if (!(dev->enabled_protocols & RC_BIT_MCE_KBD))
+	if (!rc_protocols_enabled(dev, RC_BIT_MCE_KBD))
 		return 0;
 
 	if (!is_timing_event(ev)) {
diff --git a/drivers/media/rc/ir-nec-decoder.c b/drivers/media/rc/ir-nec-decoder.c
index e687a42..9de1791 100644
--- a/drivers/media/rc/ir-nec-decoder.c
+++ b/drivers/media/rc/ir-nec-decoder.c
@@ -52,7 +52,7 @@ static int ir_nec_decode(struct rc_dev *dev, struct ir_raw_event ev)
 	u8 address, not_address, command, not_command;
 	bool send_32bits = false;
 
-	if (!(dev->enabled_protocols & RC_BIT_NEC))
+	if (!rc_protocols_enabled(dev, RC_BIT_NEC))
 		return 0;
 
 	if (!is_timing_event(ev)) {
diff --git a/drivers/media/rc/ir-raw.c b/drivers/media/rc/ir-raw.c
index f0656fa..763c9d1 100644
--- a/drivers/media/rc/ir-raw.c
+++ b/drivers/media/rc/ir-raw.c
@@ -256,7 +256,7 @@ int ir_raw_event_register(struct rc_dev *dev)
 		return -ENOMEM;
 
 	dev->raw->dev = dev;
-	dev->enabled_protocols = ~0;
+	rc_set_enabled_protocols(dev, ~0);
 	rc = kfifo_alloc(&dev->raw->kfifo,
 			 sizeof(struct ir_raw_event) * MAX_IR_EVENT_SIZE,
 			 GFP_KERNEL);
diff --git a/drivers/media/rc/ir-rc5-decoder.c b/drivers/media/rc/ir-rc5-decoder.c
index 1085e17..4295d9b2 100644
--- a/drivers/media/rc/ir-rc5-decoder.c
+++ b/drivers/media/rc/ir-rc5-decoder.c
@@ -52,7 +52,7 @@ static int ir_rc5_decode(struct rc_dev *dev, struct ir_raw_event ev)
 	u8 toggle;
 	u32 scancode;
 
-	if (!(dev->enabled_protocols & (RC_BIT_RC5 | RC_BIT_RC5X)))
+	if (!rc_protocols_enabled(dev, RC_BIT_RC5 | RC_BIT_RC5X))
 		return 0;
 
 	if (!is_timing_event(ev)) {
@@ -128,7 +128,7 @@ static int ir_rc5_decode(struct rc_dev *dev, struct ir_raw_event ev)
 		if (data->wanted_bits == RC5X_NBITS) {
 			/* RC5X */
 			u8 xdata, command, system;
-			if (!(dev->enabled_protocols & RC_BIT_RC5X)) {
+			if (!rc_protocols_enabled(dev, RC_BIT_RC5X)) {
 				data->state = STATE_INACTIVE;
 				return 0;
 			}
@@ -145,7 +145,7 @@ static int ir_rc5_decode(struct rc_dev *dev, struct ir_raw_event ev)
 		} else {
 			/* RC5 */
 			u8 command, system;
-			if (!(dev->enabled_protocols & RC_BIT_RC5)) {
+			if (!rc_protocols_enabled(dev, RC_BIT_RC5)) {
 				data->state = STATE_INACTIVE;
 				return 0;
 			}
diff --git a/drivers/media/rc/ir-rc5-sz-decoder.c b/drivers/media/rc/ir-rc5-sz-decoder.c
index 984e5b9..dc18b74 100644
--- a/drivers/media/rc/ir-rc5-sz-decoder.c
+++ b/drivers/media/rc/ir-rc5-sz-decoder.c
@@ -48,7 +48,7 @@ static int ir_rc5_sz_decode(struct rc_dev *dev, struct ir_raw_event ev)
 	u8 toggle, command, system;
 	u32 scancode;
 
-	if (!(dev->enabled_protocols & RC_BIT_RC5_SZ))
+	if (!rc_protocols_enabled(dev, RC_BIT_RC5_SZ))
 		return 0;
 
 	if (!is_timing_event(ev)) {
diff --git a/drivers/media/rc/ir-rc6-decoder.c b/drivers/media/rc/ir-rc6-decoder.c
index 7cba7d3..cfbd64e 100644
--- a/drivers/media/rc/ir-rc6-decoder.c
+++ b/drivers/media/rc/ir-rc6-decoder.c
@@ -89,9 +89,9 @@ static int ir_rc6_decode(struct rc_dev *dev, struct ir_raw_event ev)
 	u32 scancode;
 	u8 toggle;
 
-	if (!(dev->enabled_protocols &
-	      (RC_BIT_RC6_0 | RC_BIT_RC6_6A_20 | RC_BIT_RC6_6A_24 |
-	       RC_BIT_RC6_6A_32 | RC_BIT_RC6_MCE)))
+	if (!rc_protocols_enabled(dev, RC_BIT_RC6_0 | RC_BIT_RC6_6A_20 |
+				  RC_BIT_RC6_6A_24 | RC_BIT_RC6_6A_32 |
+				  RC_BIT_RC6_MCE))
 		return 0;
 
 	if (!is_timing_event(ev)) {
diff --git a/drivers/media/rc/ir-sanyo-decoder.c b/drivers/media/rc/ir-sanyo-decoder.c
index e1351ed..eb715f0 100644
--- a/drivers/media/rc/ir-sanyo-decoder.c
+++ b/drivers/media/rc/ir-sanyo-decoder.c
@@ -58,7 +58,7 @@ static int ir_sanyo_decode(struct rc_dev *dev, struct ir_raw_event ev)
 	u32 scancode;
 	u8 address, command, not_command;
 
-	if (!(dev->enabled_protocols & RC_BIT_SANYO))
+	if (!rc_protocols_enabled(dev, RC_BIT_SANYO))
 		return 0;
 
 	if (!is_timing_event(ev)) {
diff --git a/drivers/media/rc/ir-sharp-decoder.c b/drivers/media/rc/ir-sharp-decoder.c
index 4895bc7..66d2039 100644
diff --git a/drivers/media/rc/ir-sony-decoder.c b/drivers/media/rc/ir-sony-decoder.c
index 29ab9c2..599c19a 100644
--- a/drivers/media/rc/ir-sony-decoder.c
+++ b/drivers/media/rc/ir-sony-decoder.c
@@ -45,8 +45,8 @@ static int ir_sony_decode(struct rc_dev *dev, struct ir_raw_event ev)
 	u32 scancode;
 	u8 device, subdevice, function;
 
-	if (!(dev->enabled_protocols &
-	      (RC_BIT_SONY12 | RC_BIT_SONY15 | RC_BIT_SONY20)))
+	if (!rc_protocols_enabled(dev, RC_BIT_SONY12 | RC_BIT_SONY15 |
+				  RC_BIT_SONY20))
 		return 0;
 
 	if (!is_timing_event(ev)) {
@@ -124,7 +124,7 @@ static int ir_sony_decode(struct rc_dev *dev, struct ir_raw_event ev)
 
 		switch (data->count) {
 		case 12:
-			if (!(dev->enabled_protocols & RC_BIT_SONY12)) {
+			if (!rc_protocols_enabled(dev, RC_BIT_SONY12)) {
 				data->state = STATE_INACTIVE;
 				return 0;
 			}
@@ -133,7 +133,7 @@ static int ir_sony_decode(struct rc_dev *dev, struct ir_raw_event ev)
 			function  = bitrev8((data->bits >>  4) & 0xFE);
 			break;
 		case 15:
-			if (!(dev->enabled_protocols & RC_BIT_SONY15)) {
+			if (!rc_protocols_enabled(dev, RC_BIT_SONY15)) {
 				data->state = STATE_INACTIVE;
 				return 0;
 			}
@@ -142,7 +142,7 @@ static int ir_sony_decode(struct rc_dev *dev, struct ir_raw_event ev)
 			function  = bitrev8((data->bits >>  7) & 0xFE);
 			break;
 		case 20:
-			if (!(dev->enabled_protocols & RC_BIT_SONY20)) {
+			if (!rc_protocols_enabled(dev, RC_BIT_SONY20)) {
 				data->state = STATE_INACTIVE;
 				return 0;
 			}
diff --git a/drivers/media/rc/ite-cir.c b/drivers/media/rc/ite-cir.c
index 63b4225..ab24cc6 100644
--- a/drivers/media/rc/ite-cir.c
+++ b/drivers/media/rc/ite-cir.c
@@ -1563,7 +1563,7 @@ static int ite_probe(struct pnp_dev *pdev, const struct pnp_device_id
 	/* set up ir-core props */
 	rdev->priv = itdev;
 	rdev->driver_type = RC_DRIVER_IR_RAW;
-	rdev->allowed_protos = RC_BIT_ALL;
+	rc_set_allowed_protocols(rdev, RC_BIT_ALL);
 	rdev->open = ite_open;
 	rdev->close = ite_close;
 	rdev->s_idle = ite_s_idle;
diff --git a/drivers/media/rc/mceusb.c b/drivers/media/rc/mceusb.c
index c01b4c1..5d8f3d4 100644
--- a/drivers/media/rc/mceusb.c
+++ b/drivers/media/rc/mceusb.c
@@ -1211,7 +1211,7 @@ static struct rc_dev *mceusb_init_rc_dev(struct mceusb_dev *ir)
 	rc->dev.parent = dev;
 	rc->priv = ir;
 	rc->driver_type = RC_DRIVER_IR_RAW;
-	rc->allowed_protos = RC_BIT_ALL;
+	rc_set_allowed_protocols(rc, RC_BIT_ALL);
 	rc->timeout = MS_TO_NS(100);
 	if (!ir->flags.no_tx) {
 		rc->s_tx_mask = mceusb_set_tx_mask;
diff --git a/drivers/media/rc/nuvoton-cir.c b/drivers/media/rc/nuvoton-cir.c
index b81325d..d244e1a 100644
--- a/drivers/media/rc/nuvoton-cir.c
+++ b/drivers/media/rc/nuvoton-cir.c
@@ -1044,7 +1044,7 @@ static int nvt_probe(struct pnp_dev *pdev, const struct pnp_device_id *dev_id)
 	/* Set up the rc device */
 	rdev->priv = nvt;
 	rdev->driver_type = RC_DRIVER_IR_RAW;
-	rdev->allowed_protos = RC_BIT_ALL;
+	rc_set_allowed_protocols(rdev, RC_BIT_ALL);
 	rdev->open = nvt_open;
 	rdev->close = nvt_close;
 	rdev->tx_ir = nvt_tx_ir;
diff --git a/drivers/media/rc/rc-loopback.c b/drivers/media/rc/rc-loopback.c
index 53d0282..0a88e0c 100644
--- a/drivers/media/rc/rc-loopback.c
+++ b/drivers/media/rc/rc-loopback.c
@@ -195,7 +195,7 @@ static int __init loop_init(void)
 	rc->map_name		= RC_MAP_EMPTY;
 	rc->priv		= &loopdev;
 	rc->driver_type		= RC_DRIVER_IR_RAW;
-	rc->allowed_protos	= RC_BIT_ALL;
+	rc_set_allowed_protocols(rc, RC_BIT_ALL);
 	rc->timeout		= 100 * 1000 * 1000; /* 100 ms */
 	rc->min_timeout		= 1;
 	rc->max_timeout		= UINT_MAX;
diff --git a/drivers/media/rc/redrat3.c b/drivers/media/rc/redrat3.c
index a5d4f88..47cd373 100644
--- a/drivers/media/rc/redrat3.c
+++ b/drivers/media/rc/redrat3.c
@@ -922,7 +922,7 @@ static struct rc_dev *redrat3_init_rc_dev(struct redrat3_dev *rr3)
 	rc->dev.parent = dev;
 	rc->priv = rr3;
 	rc->driver_type = RC_DRIVER_IR_RAW;
-	rc->allowed_protos = RC_BIT_ALL;
+	rc_set_allowed_protocols(rc, RC_BIT_ALL);
 	rc->timeout = US_TO_NS(2750);
 	rc->tx_ir = redrat3_transmit_ir;
 	rc->s_tx_carrier = redrat3_set_tx_carrier;
diff --git a/drivers/media/rc/st_rc.c b/drivers/media/rc/st_rc.c
index 8f0cddb..22e4c1f 100644
--- a/drivers/media/rc/st_rc.c
+++ b/drivers/media/rc/st_rc.c
@@ -287,7 +287,7 @@ static int st_rc_probe(struct platform_device *pdev)
 	st_rc_hardware_init(rc_dev);
 
 	rdev->driver_type = RC_DRIVER_IR_RAW;
-	rdev->allowed_protos = RC_BIT_ALL;
+	rc_set_allowed_protocols(rdev, RC_BIT_ALL);
 	/* rx sampling rate is 10Mhz */
 	rdev->rx_resolution = 100;
 	rdev->timeout = US_TO_NS(MAX_SYMB_TIME);
diff --git a/drivers/media/rc/streamzap.c b/drivers/media/rc/streamzap.c
index d7b11e6..f4e0bc3 100644
--- a/drivers/media/rc/streamzap.c
+++ b/drivers/media/rc/streamzap.c
@@ -322,7 +322,7 @@ static struct rc_dev *streamzap_init_rc_dev(struct streamzap_ir *sz)
 	rdev->dev.parent = dev;
 	rdev->priv = sz;
 	rdev->driver_type = RC_DRIVER_IR_RAW;
-	rdev->allowed_protos = RC_BIT_ALL;
+	rc_set_allowed_protocols(rdev, RC_BIT_ALL);
 	rdev->driver_name = DRIVER_NAME;
 	rdev->map_name = RC_MAP_STREAMZAP;
 
diff --git a/drivers/media/rc/ttusbir.c b/drivers/media/rc/ttusbir.c
index d8de205..c5be38e 100644
--- a/drivers/media/rc/ttusbir.c
+++ b/drivers/media/rc/ttusbir.c
@@ -318,7 +318,7 @@ static int ttusbir_probe(struct usb_interface *intf,
 	usb_to_input_id(tt->udev, &rc->input_id);
 	rc->dev.parent = &intf->dev;
 	rc->driver_type = RC_DRIVER_IR_RAW;
-	rc->allowed_protos = RC_BIT_ALL;
+	rc_set_allowed_protocols(rc, RC_BIT_ALL);
 	rc->priv = tt;
 	rc->driver_name = DRIVER_NAME;
 	rc->map_name = RC_MAP_TT_1500;
diff --git a/drivers/media/rc/winbond-cir.c b/drivers/media/rc/winbond-cir.c
index 904baf4..a8b981f 100644
--- a/drivers/media/rc/winbond-cir.c
+++ b/drivers/media/rc/winbond-cir.c
@@ -1082,7 +1082,7 @@ wbcir_probe(struct pnp_dev *device, const struct pnp_device_id *dev_id)
 	data->dev->dev.parent = &device->dev;
 	data->dev->timeout = MS_TO_NS(100);
 	data->dev->rx_resolution = US_TO_NS(2);
-	data->dev->allowed_protos = RC_BIT_ALL;
+	rc_set_allowed_protocols(data->dev, RC_BIT_ALL);
 
 	err = rc_register_device(data->dev);
 	if (err)
diff --git a/drivers/media/usb/dvb-usb-v2/dvb_usb_core.c b/drivers/media/usb/dvb-usb-v2/dvb_usb_core.c
index 8a054d6..de02db8 100644
--- a/drivers/media/usb/dvb-usb-v2/dvb_usb_core.c
+++ b/drivers/media/usb/dvb-usb-v2/dvb_usb_core.c
@@ -164,7 +164,7 @@ static int dvb_usbv2_remote_init(struct dvb_usb_device *d)
 	dev->driver_name = (char *) d->props->driver_name;
 	dev->map_name = d->rc.map_name;
 	dev->driver_type = d->rc.driver_type;
-	dev->allowed_protos = d->rc.allowed_protos;
+	rc_set_allowed_protocols(dev, d->rc.allowed_protos);
 	dev->change_protocol = d->rc.change_protocol;
 	dev->priv = d;
 
diff --git a/drivers/media/usb/dvb-usb/dvb-usb-remote.c b/drivers/media/usb/dvb-usb/dvb-usb-remote.c
index 41bacff..4058aea 100644
--- a/drivers/media/usb/dvb-usb/dvb-usb-remote.c
+++ b/drivers/media/usb/dvb-usb/dvb-usb-remote.c
@@ -272,7 +272,7 @@ static int rc_core_dvb_usb_remote_init(struct dvb_usb_device *d)
 	dev->driver_name = d->props.rc.core.module_name;
 	dev->map_name = d->props.rc.core.rc_codes;
 	dev->change_protocol = d->props.rc.core.change_protocol;
-	dev->allowed_protos = d->props.rc.core.allowed_protos;
+	rc_set_allowed_protocols(dev, d->props.rc.core.allowed_protos);
 	dev->driver_type = d->props.rc.core.driver_type;
 	usb_to_input_id(d->udev, &dev->input_id);
 	dev->input_name = "IR-receiver inside an USB DVB receiver";
diff --git a/drivers/media/usb/em28xx/em28xx-input.c b/drivers/media/usb/em28xx/em28xx-input.c
index 2a9bf66..56ef49d 100644
--- a/drivers/media/usb/em28xx/em28xx-input.c
+++ b/drivers/media/usb/em28xx/em28xx-input.c
@@ -727,7 +727,7 @@ static int em28xx_ir_init(struct em28xx *dev)
 		case EM2820_BOARD_HAUPPAUGE_WINTV_USB_2:
 			rc->map_name = RC_MAP_HAUPPAUGE;
 			ir->get_key_i2c = em28xx_get_key_em_haup;
-			rc->allowed_protos = RC_BIT_RC5;
+			rc_set_allowed_protocols(rc, RC_BIT_RC5);
 			break;
 		case EM2820_BOARD_LEADTEK_WINFAST_USBII_DELUXE:
 			rc->map_name = RC_MAP_WINFAST_USBII_DELUXE;
@@ -743,7 +743,7 @@ static int em28xx_ir_init(struct em28xx *dev)
 		switch (dev->chip_id) {
 		case CHIP_ID_EM2860:
 		case CHIP_ID_EM2883:
-			rc->allowed_protos = RC_BIT_RC5 | RC_BIT_NEC;
+			rc_set_allowed_protocols(rc, RC_BIT_RC5 | RC_BIT_NEC);
 			ir->get_key = default_polling_getkey;
 			break;
 		case CHIP_ID_EM2884:
@@ -751,8 +751,8 @@ static int em28xx_ir_init(struct em28xx *dev)
 		case CHIP_ID_EM28174:
 		case CHIP_ID_EM28178:
 			ir->get_key = em2874_polling_getkey;
-			rc->allowed_protos = RC_BIT_RC5 | RC_BIT_NEC |
-					     RC_BIT_RC6_0;
+			rc_set_allowed_protocols(rc, RC_BIT_RC5 | RC_BIT_NEC |
+						 RC_BIT_RC6_0);
 			break;
 		default:
 			err = -ENODEV;
diff --git a/drivers/media/usb/tm6000/tm6000-input.c b/drivers/media/usb/tm6000/tm6000-input.c
index 8a6bbf1..d1af543 100644
--- a/drivers/media/usb/tm6000/tm6000-input.c
+++ b/drivers/media/usb/tm6000/tm6000-input.c
@@ -422,7 +422,7 @@ int tm6000_ir_init(struct tm6000_core *dev)
 	ir->rc = rc;
 
 	/* input setup */
-	rc->allowed_protos = RC_BIT_RC5 | RC_BIT_NEC;
+	rc_set_allowed_protocols(rc, RC_BIT_RC5 | RC_BIT_NEC);
 	/* Neded, in order to support NEC remotes with 24 or 32 bits */
 	rc->scanmask = 0xffff;
 	rc->priv = ir;
diff --git a/include/media/rc-core.h b/include/media/rc-core.h
index 5e7197e..6f3c3d9 100644
--- a/include/media/rc-core.h
+++ b/include/media/rc-core.h
@@ -160,6 +160,28 @@ struct rc_dev {
 
 #define to_rc_dev(d) container_of(d, struct rc_dev, dev)
 
+static inline bool rc_protocols_allowed(struct rc_dev *rdev, u64 protos)
+{
+	return rdev->allowed_protos & protos;
+}
+
+/* should be called prior to registration or with mutex held */
+static inline void rc_set_allowed_protocols(struct rc_dev *rdev, u64 protos)
+{
+	rdev->allowed_protos = protos;
+}
+
+static inline bool rc_protocols_enabled(struct rc_dev *rdev, u64 protos)
+{
+	return rdev->enabled_protocols & protos;
+}
+
+/* should be called prior to registration or with mutex held */
+static inline void rc_set_enabled_protocols(struct rc_dev *rdev, u64 protos)
+{
+	rdev->enabled_protocols = protos;
+}
+
 /*
  * From rc-main.c
  * Those functions can be used on any type of Remote Controller. They
From acff5f24732acc8a55d0a0f0ee1d19442267df63 Mon Sep 17 00:00:00 2001
From: James Hogan <james.hogan@imgtec.com>
Date: Fri, 28 Feb 2014 20:17:04 -0300
Subject: [PATCH] [media] rc: add allowed/enabled wakeup protocol masks
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Only a single allowed and enabled protocol mask currently exists in
struct rc_dev, however to support a separate wakeup filter protocol two
of each are needed, ideally as an array.

Therefore make both rc_dev::allowed_protos and rc_dev::enabled_protocols
arrays, update all users to reference the first element
(RC_FILTER_NORMAL), and add a couple more helper functions for drivers
to use for setting the allowed and enabled wakeup protocols.

We also rename allowed_protos to allowed_protocols while we're at it,
which is more consistent with enabled_protocols.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Reviewed-by: Antti Seppälä <a.seppala@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
---
 drivers/media/rc/rc-main.c | 10 +++++-----
 include/media/rc-core.h    | 32 ++++++++++++++++++++++++--------
 2 files changed, 29 insertions(+), 13 deletions(-)

diff --git a/drivers/media/rc/rc-main.c b/drivers/media/rc/rc-main.c
index 0a4f680f..309d791 100644
--- a/drivers/media/rc/rc-main.c
+++ b/drivers/media/rc/rc-main.c
@@ -830,9 +830,9 @@ static ssize_t show_protocols(struct device *device,
 
 	mutex_lock(&dev->lock);
 
-	enabled = dev->enabled_protocols;
+	enabled = dev->enabled_protocols[RC_FILTER_NORMAL];
 	if (dev->driver_type == RC_DRIVER_SCANCODE)
-		allowed = dev->allowed_protos;
+		allowed = dev->allowed_protocols[RC_FILTER_NORMAL];
 	else if (dev->raw)
 		allowed = ir_raw_get_allowed_protocols();
 	else {
@@ -906,7 +906,7 @@ static ssize_t store_protocols(struct device *device,
 		ret = -EINVAL;
 		goto out;
 	}
-	type = dev->enabled_protocols;
+	type = dev->enabled_protocols[RC_FILTER_NORMAL];
 
 	while ((tmp = strsep((char **) &data, " \n")) != NULL) {
 		if (!*tmp)
@@ -964,7 +964,7 @@ static ssize_t store_protocols(struct device *device,
 		}
 	}
 
-	dev->enabled_protocols = type;
+	dev->enabled_protocols[RC_FILTER_NORMAL] = type;
 	IR_dprintk(1, "Current protocol(s): 0x%llx\n",
 		   (long long)type);
 
@@ -1316,7 +1316,7 @@ int rc_register_device(struct rc_dev *dev)
 		rc = dev->change_protocol(dev, &rc_type);
 		if (rc < 0)
 			goto out_raw;
-		dev->enabled_protocols = rc_type;
+		dev->enabled_protocols[RC_FILTER_NORMAL] = rc_type;
 	}
 
 	mutex_unlock(&dev->lock);
diff --git a/include/media/rc-core.h b/include/media/rc-core.h
index 6f3c3d9..f165115 100644
--- a/include/media/rc-core.h
+++ b/include/media/rc-core.h
@@ -73,8 +73,10 @@ enum rc_filter_type {
  * @input_dev: the input child device used to communicate events to userspace
  * @driver_type: specifies if protocol decoding is done in hardware or software
  * @idle: used to keep track of RX state
- * @allowed_protos: bitmask with the supported RC_BIT_* protocols
- * @enabled_protocols: bitmask with the enabled RC_BIT_* protocols
+ * @allowed_protocols: bitmask with the supported RC_BIT_* protocols for each
+ *	filter type
+ * @enabled_protocols: bitmask with the enabled RC_BIT_* protocols for each
+ *	filter type
  * @scanmask: some hardware decoders are not capable of providing the full
  *	scancode to the application. As this is a hardware limit, we can't do
  *	anything with it. Yet, as the same keycode table can be used with other
@@ -124,8 +126,8 @@ struct rc_dev {
 	struct input_dev		*input_dev;
 	enum rc_driver_type		driver_type;
 	bool				idle;
-	u64				allowed_protos;
-	u64				enabled_protocols;
+	u64				allowed_protocols[RC_FILTER_MAX];
+	u64				enabled_protocols[RC_FILTER_MAX];
 	u32				users;
 	u32				scanmask;
 	void				*priv;
@@ -162,24 +164,38 @@ struct rc_dev {
 
 static inline bool rc_protocols_allowed(struct rc_dev *rdev, u64 protos)
 {
-	return rdev->allowed_protos & protos;
+	return rdev->allowed_protocols[RC_FILTER_NORMAL] & protos;
 }
 
 /* should be called prior to registration or with mutex held */
 static inline void rc_set_allowed_protocols(struct rc_dev *rdev, u64 protos)
 {
-	rdev->allowed_protos = protos;
+	rdev->allowed_protocols[RC_FILTER_NORMAL] = protos;
 }
 
 static inline bool rc_protocols_enabled(struct rc_dev *rdev, u64 protos)
 {
-	return rdev->enabled_protocols & protos;
+	return rdev->enabled_protocols[RC_FILTER_NORMAL] & protos;
 }
 
 /* should be called prior to registration or with mutex held */
 static inline void rc_set_enabled_protocols(struct rc_dev *rdev, u64 protos)
 {
-	rdev->enabled_protocols = protos;
+	rdev->enabled_protocols[RC_FILTER_NORMAL] = protos;
+}
+
+/* should be called prior to registration or with mutex held */
+static inline void rc_set_allowed_wakeup_protocols(struct rc_dev *rdev,
+						   u64 protos)
+{
+	rdev->allowed_protocols[RC_FILTER_WAKEUP] = protos;
+}
+
+/* should be called prior to registration or with mutex held */
+static inline void rc_set_enabled_wakeup_protocols(struct rc_dev *rdev,
+						   u64 protos)
+{
+	rdev->enabled_protocols[RC_FILTER_WAKEUP] = protos;
 }
 
 /*
From ab88c66deace78989aa71cb139284cf7fb227ba4 Mon Sep 17 00:00:00 2001
From: James Hogan <james.hogan@imgtec.com>
Date: Fri, 28 Feb 2014 20:17:05 -0300
Subject: [PATCH] [media] rc: add wakeup_protocols sysfs file
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Add a wakeup_protocols sysfs file which controls the new
rc_dev::enabled_protocols[RC_FILTER_WAKEUP], which is the mask of
protocols that are used for the wakeup filter.

A new RC driver callback change_wakeup_protocol() is called to change
the wakeup protocol mask.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Reviewed-by: Antti Seppälä <a.seppala@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
---
 Documentation/ABI/testing/sysfs-class-rc           | 23 +++++-
 .../DocBook/media/v4l/remote_controllers.xml       | 20 +++++-
 drivers/media/rc/rc-main.c                         | 82 +++++++++++++---------
 include/media/rc-core.h                            |  3 +
 4 files changed, 90 insertions(+), 38 deletions(-)

diff --git a/Documentation/ABI/testing/sysfs-class-rc b/Documentation/ABI/testing/sysfs-class-rc
index c0e1d14..b65674d 100644
diff --git a/Documentation/DocBook/media/v4l/remote_controllers.xml b/Documentation/DocBook/media/v4l/remote_controllers.xml
index c440a81..5124a6c 100644
diff --git a/drivers/media/rc/rc-main.c b/drivers/media/rc/rc-main.c
index 309d791..e6e3ec7 100644
--- a/drivers/media/rc/rc-main.c
+++ b/drivers/media/rc/rc-main.c
@@ -803,13 +803,38 @@ static struct {
 };
 
 /**
- * show_protocols() - shows the current IR protocol(s)
+ * struct rc_filter_attribute - Device attribute relating to a filter type.
+ * @attr:	Device attribute.
+ * @type:	Filter type.
+ * @mask:	false for filter value, true for filter mask.
+ */
+struct rc_filter_attribute {
+	struct device_attribute		attr;
+	enum rc_filter_type		type;
+	bool				mask;
+};
+#define to_rc_filter_attr(a) container_of(a, struct rc_filter_attribute, attr)
+
+#define RC_PROTO_ATTR(_name, _mode, _show, _store, _type)		\
+	struct rc_filter_attribute dev_attr_##_name = {			\
+		.attr = __ATTR(_name, _mode, _show, _store),		\
+		.type = (_type),					\
+	}
+#define RC_FILTER_ATTR(_name, _mode, _show, _store, _type, _mask)	\
+	struct rc_filter_attribute dev_attr_##_name = {			\
+		.attr = __ATTR(_name, _mode, _show, _store),		\
+		.type = (_type),					\
+		.mask = (_mask),					\
+	}
+
+/**
+ * show_protocols() - shows the current/wakeup IR protocol(s)
  * @device:	the device descriptor
  * @mattr:	the device attribute struct (unused)
  * @buf:	a pointer to the output buffer
  *
  * This routine is a callback routine for input read the IR protocol type(s).
- * it is trigged by reading /sys/class/rc/rc?/protocols.
+ * it is trigged by reading /sys/class/rc/rc?/[wakeup_]protocols.
  * It returns the protocol names of supported protocols.
  * Enabled protocols are printed in brackets.
  *
@@ -820,6 +845,7 @@ static ssize_t show_protocols(struct device *device,
 			      struct device_attribute *mattr, char *buf)
 {
 	struct rc_dev *dev = to_rc_dev(device);
+	struct rc_filter_attribute *fattr = to_rc_filter_attr(mattr);
 	u64 allowed, enabled;
 	char *tmp = buf;
 	int i;
@@ -830,9 +856,10 @@ static ssize_t show_protocols(struct device *device,
 
 	mutex_lock(&dev->lock);
 
-	enabled = dev->enabled_protocols[RC_FILTER_NORMAL];
-	if (dev->driver_type == RC_DRIVER_SCANCODE)
-		allowed = dev->allowed_protocols[RC_FILTER_NORMAL];
+	enabled = dev->enabled_protocols[fattr->type];
+	if (dev->driver_type == RC_DRIVER_SCANCODE ||
+	    fattr->type == RC_FILTER_WAKEUP)
+		allowed = dev->allowed_protocols[fattr->type];
 	else if (dev->raw)
 		allowed = ir_raw_get_allowed_protocols();
 	else {
@@ -864,14 +891,14 @@ static ssize_t show_protocols(struct device *device,
 }
 
 /**
- * store_protocols() - changes the current IR protocol(s)
+ * store_protocols() - changes the current/wakeup IR protocol(s)
  * @device:	the device descriptor
  * @mattr:	the device attribute struct (unused)
  * @buf:	a pointer to the input buffer
  * @len:	length of the input buffer
  *
  * This routine is for changing the IR protocol type.
- * It is trigged by writing to /sys/class/rc/rc?/protocols.
+ * It is trigged by writing to /sys/class/rc/rc?/[wakeup_]protocols.
  * Writing "+proto" will add a protocol to the list of enabled protocols.
  * Writing "-proto" will remove a protocol from the list of enabled protocols.
  * Writing "proto" will enable only "proto".
@@ -888,12 +915,14 @@ static ssize_t store_protocols(struct device *device,
 			       size_t len)
 {
 	struct rc_dev *dev = to_rc_dev(device);
+	struct rc_filter_attribute *fattr = to_rc_filter_attr(mattr);
 	bool enable, disable;
 	const char *tmp;
 	u64 type;
 	u64 mask;
 	int rc, i, count = 0;
 	ssize_t ret;
+	int (*change_protocol)(struct rc_dev *dev, u64 *rc_type);
 
 	/* Device is being removed */
 	if (!dev)
@@ -906,7 +935,7 @@ static ssize_t store_protocols(struct device *device,
 		ret = -EINVAL;
 		goto out;
 	}
-	type = dev->enabled_protocols[RC_FILTER_NORMAL];
+	type = dev->enabled_protocols[fattr->type];
 
 	while ((tmp = strsep((char **) &data, " \n")) != NULL) {
 		if (!*tmp)
@@ -954,8 +983,10 @@ static ssize_t store_protocols(struct device *device,
 		goto out;
 	}
 
-	if (dev->change_protocol) {
-		rc = dev->change_protocol(dev, &type);
+	change_protocol = (fattr->type == RC_FILTER_NORMAL)
+		? dev->change_protocol : dev->change_wakeup_protocol;
+	if (change_protocol) {
+		rc = change_protocol(dev, &type);
 		if (rc < 0) {
 			IR_dprintk(1, "Error setting protocols to 0x%llx\n",
 				   (long long)type);
@@ -964,7 +995,7 @@ static ssize_t store_protocols(struct device *device,
 		}
 	}
 
-	dev->enabled_protocols[RC_FILTER_NORMAL] = type;
+	dev->enabled_protocols[fattr->type] = type;
 	IR_dprintk(1, "Current protocol(s): 0x%llx\n",
 		   (long long)type);
 
@@ -976,26 +1007,6 @@ static ssize_t store_protocols(struct device *device,
 }
 
 /**
- * struct rc_filter_attribute - Device attribute relating to a filter type.
- * @attr:	Device attribute.
- * @type:	Filter type.
- * @mask:	false for filter value, true for filter mask.
- */
-struct rc_filter_attribute {
-	struct device_attribute		attr;
-	enum rc_filter_type		type;
-	bool				mask;
-};
-#define to_rc_filter_attr(a) container_of(a, struct rc_filter_attribute, attr)
-
-#define RC_FILTER_ATTR(_name, _mode, _show, _store, _type, _mask)	\
-	struct rc_filter_attribute dev_attr_##_name = {			\
-		.attr = __ATTR(_name, _mode, _show, _store),		\
-		.type = (_type),					\
-		.mask = (_mask),					\
-	}
-
-/**
  * show_filter() - shows the current scancode filter value or mask
  * @device:	the device descriptor
  * @attr:	the device attribute struct
@@ -1128,8 +1139,10 @@ static int rc_dev_uevent(struct device *device, struct kobj_uevent_env *env)
 /*
  * Static device attribute struct with the sysfs attributes for IR's
  */
-static DEVICE_ATTR(protocols, S_IRUGO | S_IWUSR,
-		   show_protocols, store_protocols);
+static RC_PROTO_ATTR(protocols, S_IRUGO | S_IWUSR,
+		     show_protocols, store_protocols, RC_FILTER_NORMAL);
+static RC_PROTO_ATTR(wakeup_protocols, S_IRUGO | S_IWUSR,
+		     show_protocols, store_protocols, RC_FILTER_WAKEUP);
 static RC_FILTER_ATTR(filter, S_IRUGO|S_IWUSR,
 		      show_filter, store_filter, RC_FILTER_NORMAL, false);
 static RC_FILTER_ATTR(filter_mask, S_IRUGO|S_IWUSR,
@@ -1140,7 +1153,8 @@ static RC_FILTER_ATTR(wakeup_filter_mask, S_IRUGO|S_IWUSR,
 		      show_filter, store_filter, RC_FILTER_WAKEUP, true);
 
 static struct attribute *rc_dev_attrs[] = {
-	&dev_attr_protocols.attr,
+	&dev_attr_protocols.attr.attr,
+	&dev_attr_wakeup_protocols.attr.attr,
 	&dev_attr_filter.attr.attr,
 	&dev_attr_filter_mask.attr.attr,
 	&dev_attr_wakeup_filter.attr.attr,
diff --git a/include/media/rc-core.h b/include/media/rc-core.h
index f165115..0b9f890 100644
--- a/include/media/rc-core.h
+++ b/include/media/rc-core.h
@@ -97,6 +97,8 @@ enum rc_filter_type {
  * @tx_resolution: resolution (in ns) of output sampler
  * @scancode_filters: scancode filters (indexed by enum rc_filter_type)
  * @change_protocol: allow changing the protocol used on hardware decoders
+ * @change_wakeup_protocol: allow changing the protocol used for wakeup
+ *	filtering
  * @open: callback to allow drivers to enable polling/irq when IR input device
  *	is opened.
  * @close: callback to allow drivers to disable polling/irq when IR input device
@@ -145,6 +147,7 @@ struct rc_dev {
 	u32				tx_resolution;
 	struct rc_scancode_filter	scancode_filters[RC_FILTER_MAX];
 	int				(*change_protocol)(struct rc_dev *dev, u64 *rc_type);
+	int				(*change_wakeup_protocol)(struct rc_dev *dev, u64 *rc_type);
 	int				(*open)(struct rc_dev *dev);
 	void				(*close)(struct rc_dev *dev);
 	int				(*s_tx_mask)(struct rc_dev *dev, u32 mask);
From 6bea25af147fcddcd8fd4557f4184c847c5c6ffd Mon Sep 17 00:00:00 2001
From: James Hogan <james.hogan@imgtec.com>
Date: Fri, 28 Feb 2014 20:17:06 -0300
Subject: [PATCH] [media] rc-main: automatically refresh filter on protocol
 change
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

When either of the normal or wakeup filter protocols are changed,
refresh the corresponding scancode filter, i.e. try and set the same
scancode filter with the new protocol. If that fails clear the filter
instead.

If no protocol was selected the filter is just cleared, and if no
s_filter callback exists the filter is left unmodified.

Similarly clear the filter mask when the filter is set if no protocol is
currently selected.

This simplifies driver code which no longer has to explicitly worry
about modifying the filter on a protocol change. This also allows the
change_wakeup_protocol callback to be omitted entirely if there is only
a single available wakeup protocol at a time, since selecting no
protocol will automatically clear the wakeup filter, disabling wakeup.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Reviewed-by: Antti Seppälä <a.seppala@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
---
 drivers/media/rc/rc-main.c | 41 +++++++++++++++++++++++++++++++++++++++--
 1 file changed, 39 insertions(+), 2 deletions(-)

diff --git a/drivers/media/rc/rc-main.c b/drivers/media/rc/rc-main.c
index e6e3ec7..b1a6900 100644
--- a/drivers/media/rc/rc-main.c
+++ b/drivers/media/rc/rc-main.c
@@ -918,11 +918,12 @@ static ssize_t store_protocols(struct device *device,
 	struct rc_filter_attribute *fattr = to_rc_filter_attr(mattr);
 	bool enable, disable;
 	const char *tmp;
-	u64 type;
+	u64 old_type, type;
 	u64 mask;
 	int rc, i, count = 0;
 	ssize_t ret;
 	int (*change_protocol)(struct rc_dev *dev, u64 *rc_type);
+	struct rc_scancode_filter local_filter, *filter;
 
 	/* Device is being removed */
 	if (!dev)
@@ -935,7 +936,8 @@ static ssize_t store_protocols(struct device *device,
 		ret = -EINVAL;
 		goto out;
 	}
-	type = dev->enabled_protocols[fattr->type];
+	old_type = dev->enabled_protocols[fattr->type];
+	type = old_type;
 
 	while ((tmp = strsep((char **) &data, " \n")) != NULL) {
 		if (!*tmp)
@@ -999,6 +1001,36 @@ static ssize_t store_protocols(struct device *device,
 	IR_dprintk(1, "Current protocol(s): 0x%llx\n",
 		   (long long)type);
 
+	/*
+	 * If the protocol is changed the filter needs updating.
+	 * Try setting the same filter with the new protocol (if any).
+	 * Fall back to clearing the filter.
+	 */
+	filter = &dev->scancode_filters[fattr->type];
+	if (old_type != type && filter->mask) {
+		local_filter = *filter;
+		if (!type) {
+			/* no protocol => clear filter */
+			ret = -1;
+		} else if (!dev->s_filter) {
+			/* generic filtering => accept any filter */
+			ret = 0;
+		} else {
+			/* hardware filtering => try setting, otherwise clear */
+			ret = dev->s_filter(dev, fattr->type, &local_filter);
+		}
+		if (ret < 0) {
+			/* clear the filter */
+			local_filter.data = 0;
+			local_filter.mask = 0;
+			if (dev->s_filter)
+				dev->s_filter(dev, fattr->type, &local_filter);
+		}
+
+		/* commit the new filter */
+		*filter = local_filter;
+	}
+
 	ret = len;
 
 out:
@@ -1096,6 +1128,11 @@ static ssize_t store_filter(struct device *device,
 		local_filter.mask = val;
 	else
 		local_filter.data = val;
+	if (!dev->enabled_protocols[fattr->type] && local_filter.mask) {
+		/* refuse to set a filter unless a protocol is enabled */
+		ret = -EINVAL;
+		goto unlock;
+	}
 	if (dev->s_filter) {
 		ret = dev->s_filter(dev, fattr->type, &local_filter);
 		if (ret < 0)
From 262912335c823a2bbcc87003ee55d62cc27f4e48 Mon Sep 17 00:00:00 2001
From: James Hogan <james.hogan@imgtec.com>
Date: Sat, 1 Mar 2014 19:52:25 -0300
Subject: [PATCH] [media] rc-main: fix missing unlock if no devno left

While playing with make coccicheck I noticed this message:
drivers/media/rc/rc-main.c:1245:3-9: preceding lock on line 1238

It was introduced by commit 587d1b06e07b ([media] rc-core: reuse device
numbers) which returns -ENOMEM after a mutex_lock without first
unlocking it when there are no more device numbers left. The added code
doesn't depend on the device lock, so move it before the lock is taken.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
---
 drivers/media/rc/rc-main.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/media/rc/rc-main.c b/drivers/media/rc/rc-main.c
index b1a6900..f87e0f0 100644
--- a/drivers/media/rc/rc-main.c
+++ b/drivers/media/rc/rc-main.c
@@ -1286,14 +1286,6 @@ int rc_register_device(struct rc_dev *dev)
 	if (dev->close)
 		dev->input_dev->close = ir_close;
 
-	/*
-	 * Take the lock here, as the device sysfs node will appear
-	 * when device_add() is called, which may trigger an ir-keytable udev
-	 * rule, which will in turn call show_protocols and access
-	 * dev->enabled_protocols before it has been initialized.
-	 */
-	mutex_lock(&dev->lock);
-
 	do {
 		devno = find_first_zero_bit(ir_core_dev_number,
 					    IRRCV_NUM_DEVICES);
@@ -1302,6 +1294,14 @@ int rc_register_device(struct rc_dev *dev)
 			return -ENOMEM;
 	} while (test_and_set_bit(devno, ir_core_dev_number));
 
+	/*
+	 * Take the lock here, as the device sysfs node will appear
+	 * when device_add() is called, which may trigger an ir-keytable udev
+	 * rule, which will in turn call show_protocols and access
+	 * dev->enabled_protocols before it has been initialized.
+	 */
+	mutex_lock(&dev->lock);
+
 	dev->devno = devno;
 	dev_set_name(&dev->dev, "rc%ld", dev->devno);
 	dev_set_drvdata(&dev->dev, dev);