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

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>

2 files changed, 35 insertions, 0 deletions

diff --git a/include/media/ir-common.h b/include/media/ir-common.h
index 41469b79ad1..87f2ec78deb 100644
--- a/include/media/ir-common.h
+++ b/include/media/ir-common.h
@@ -82,6 +82,9 @@ struct card_ir {
         /* NEC decoding */
         u32                     nec_gpio;
         struct tasklet_struct   tlet;
+
+        /* IR core raw decoding */
+        u32                     raw_decode;
 };
 
 /* Routines from ir-functions.c */
diff --git a/include/media/ir-core.h b/include/media/ir-core.h
index 1eae72d518e..369969d9077 100644
--- a/include/media/ir-core.h
+++ b/include/media/ir-core.h
@@ -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