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[media] media: rc: add sysfs scancode filtering interface

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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>
This commit is contained in:
James Hogan
2014-01-17 10:58:49 -03:00
committed by Mauro Carvalho Chehab
parent 324a6673a8
commit 00942d1a1b
3 changed files with 223 additions and 0 deletions
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29
include/media/rc-core.h
View File

@@ -34,6 +34,29 @@ enum rc_driver_type {
RC_DRIVER_IR_RAW, /* Needs a Infra-Red pulse/space decoder */
};
/**
* 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
@@ -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)