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[media] rc: rc-ir-raw: Add scancode encoder callback 

Add a callback to raw ir handlers for encoding and modulating a scancode
to a set of raw events. This could be used for transmit, or for
converting a wakeup scancode to a form that is more suitable for raw
hardware wake up filters.

Signed-off-by: James Hogan <james@albanarts.com>
Signed-off-by: Antti Seppälä <a.seppala@gmail.com>
Signed-off-by: Sean Young <sean@mess.org>
Cc: David Härdeman <david@hardeman.nu>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
James Hogan 2015-03-31 14:48:06 -03:00 committed by Mauro Carvalho Chehab
parent 8c34b5c4c8
commit 3875233d0b
3 changed files with 41 additions and 0 deletions
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2
drivers/media/rc/rc-core-priv.h
View File

@ -27,6 +27,8 @@ struct ir_raw_handler {
u64 protocols; /* which are handled by this handler */
int (*decode)(struct rc_dev *dev, struct ir_raw_event event);
int (*encode)(enum rc_type protocol, u32 scancode,
struct ir_raw_event *events, unsigned int max);
/* These two should only be used by the lirc decoder */
int (*raw_register)(struct rc_dev *dev);

37
drivers/media/rc/rc-ir-raw.c
View File

@ -238,6 +238,43 @@ static void ir_raw_disable_protocols(struct rc_dev *dev, u64 protocols)
mutex_unlock(&dev->lock);
}
/**
* ir_raw_encode_scancode() - Encode a scancode as raw events
*
* @protocol: protocol
* @scancode: scancode filter describing a single scancode
* @events: array of raw events to write into
* @max: max number of raw events
*
* Attempts to encode the scancode as raw events.
*
* Returns: The number of events written.
* -ENOBUFS if there isn't enough space in the array to fit the
* encoding. In this case all @max events will have been written.
* -EINVAL if the scancode is ambiguous or invalid, or if no
* compatible encoder was found.
*/
int ir_raw_encode_scancode(enum rc_type protocol, u32 scancode,
struct ir_raw_event *events, unsigned int max)
{
struct ir_raw_handler *handler;
int ret = -EINVAL;
u64 mask = 1ULL << protocol;
mutex_lock(&ir_raw_handler_lock);
list_for_each_entry(handler, &ir_raw_handler_list, list) {
if (handler->protocols & mask && handler->encode) {
ret = handler->encode(protocol, scancode, events, max);
if (ret >= 0 || ret == -ENOBUFS)
break;
}
}
mutex_unlock(&ir_raw_handler_lock);
return ret;
}
EXPORT_SYMBOL(ir_raw_encode_scancode);
/*
* Used to (un)register raw event clients
*/

2
include/media/rc-core.h
View File

@ -306,6 +306,8 @@ int ir_raw_event_store_edge(struct rc_dev *dev, enum raw_event_type type);
int ir_raw_event_store_with_filter(struct rc_dev *dev,
struct ir_raw_event *ev);
void ir_raw_event_set_idle(struct rc_dev *dev, bool idle);
int ir_raw_encode_scancode(enum rc_type protocol, u32 scancode,
struct ir_raw_event *events, unsigned int max);
static inline void ir_raw_event_reset(struct rc_dev *dev)
{