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V4L/DVB: ir-core: Add logic to decode IR protocols at the IR core

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Adds a method to pass IR raw pulse/code events into ir-core. This is
needed in order to support LIRC. It also helps to move common code
from the drivers into the core.

In order to allow testing, it implements a simple NEC protocol decoder
at ir-nec-decoder.c file. The logic is about the same used at saa7134
driver that handles Avermedia M135A and Encore FM53 boards.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Mauro Carvalho Chehab
2010-03-20 20:59:44 -03:00
parent 0210894956
commit a3572c34da
6 changed files with 365 additions and 5 deletions
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32
include/media/ir-core.h
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@@ -16,6 +16,8 @@
#include <linux/input.h>
#include <linux/spinlock.h>
#include <linux/kfifo.h>
#include <linux/time.h>
extern int ir_core_debug;
#define IR_dprintk(level, fmt, arg...) if (ir_core_debug >= level) \
@@ -27,6 +29,13 @@ extern int ir_core_debug;
#define IR_TYPE_NEC (1 << 2)
#define IR_TYPE_OTHER (((u64)1) << 63l)
enum raw_event_type {
IR_SPACE = (1 << 0),
IR_PULSE = (1 << 1),
IR_START_EVENT = (1 << 2),
IR_STOP_EVENT = (1 << 3),
};
struct ir_scancode {
u16 scancode;
u32 keycode;
@@ -46,6 +55,15 @@ struct ir_dev_props {
int (*change_protocol)(void *priv, u64 ir_type);
};
struct ir_raw_event {
struct timespec delta; /* Time spent before event */
enum raw_event_type type; /* event type */
};
struct ir_raw_event_ctrl {
struct kfifo kfifo; /* fifo for the pulse/space events */
struct timespec last_event; /* when last event occurred */
};
struct ir_input_dev {
struct device dev; /* device */
@@ -53,7 +71,9 @@ struct ir_input_dev {
struct ir_scancode_table rc_tab; /* scan/key table */
unsigned long devno; /* device number */
const struct ir_dev_props *props; /* Device properties */
struct ir_raw_event_ctrl *raw; /* for raw pulse/space events */
};
#define to_ir_input_dev(_attr) container_of(_attr, struct ir_input_dev, attr)
/* Routines from ir-keytable.c */
@@ -72,4 +92,16 @@ void ir_input_unregister(struct input_dev *input_dev);
int ir_register_class(struct input_dev *input_dev);
void ir_unregister_class(struct input_dev *input_dev);
/* Routines from ir-raw-event.c */
int ir_raw_event_register(struct input_dev *input_dev);
void ir_raw_event_unregister(struct input_dev *input_dev);
int ir_raw_event_store(struct input_dev *input_dev, enum raw_event_type type);
int ir_raw_event_handle(struct input_dev *input_dev);
/* from ir-nec-decoder.c */
int ir_nec_decode(struct input_dev *input_dev,
struct ir_raw_event *evs,
int len);
#endif