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authorJames Hogan <james.hogan@imgtec.com>2014-01-17 10:58:49 -0300
committerMauro Carvalho Chehab <m.chehab@samsung.com>2014-02-06 09:18:57 -0200
commit00942d1a1bd93ac108c1b92d504c568a37be1833 (patch)
tree34c0e172aac0ec1ebbb5bb27cf33703c96c44262 /include/media/rc-core.h
parent324a6673a8635f050b68d78066ba25a2a17c2817 (diff)
[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>
Diffstat (limited to 'include/media/rc-core.h')
-rw-r--r--include/media/rc-core.h29
1 files changed, 29 insertions, 0 deletions
diff --git a/include/media/rc-core.h b/include/media/rc-core.h
index 2f6f1f78d958..4a72176e04f6 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)

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