[PATCH 4/9] IR: add helper function for hardware with small o/b buffer.

[Maxim Levitsky <maximlevitsky@gmail.com>]

Some ir input devices have small buffer, and interrupt the host
each time it is full (or half full)

Add a helper that automaticly handles timeouts, and also
automaticly merges samples of same time (space-space)
Such samples might be placed by hardware because size of
sample in the buffer is small (a byte for example).


Signed-off-by: Maxim Levitsky <maximlevitsky@gmail.com>
---
 drivers/media/IR/ir-core-priv.h |    1 +
 drivers/media/IR/ir-keytable.c  |    2 +-
 drivers/media/IR/ir-raw-event.c |   86 +++++++++++++++++++++++++++++++++++++++
 include/media/ir-core.h         |   24 +++++++++-
 4 files changed, 109 insertions(+), 4 deletions(-)

diff --git a/drivers/media/IR/ir-core-priv.h b/drivers/media/IR/ir-core-priv.h
index dc26e2b..d6ec4fe 100644
--- a/drivers/media/IR/ir-core-priv.h
+++ b/drivers/media/IR/ir-core-priv.h
@@ -36,6 +36,7 @@ struct ir_raw_event_ctrl {
 	struct kfifo			kfifo;		/* fifo for the pulse/space durations */
 	ktime_t				last_event;	/* when last event occurred */
 	enum raw_event_type		last_type;	/* last event type */
+	struct ir_raw_event		current_sample;	/* sample that is not yet pushed to fifo */
 	struct input_dev		*input_dev;	/* pointer to the parent input_dev */
 	u64				enabled_protocols; /* enabled raw protocol decoders */
 
diff --git a/drivers/media/IR/ir-keytable.c b/drivers/media/IR/ir-keytable.c
index 94a8577..34b9c07 100644
--- a/drivers/media/IR/ir-keytable.c
+++ b/drivers/media/IR/ir-keytable.c
@@ -428,7 +428,7 @@ static void ir_close(struct input_dev *input_dev)
  */
 int __ir_input_register(struct input_dev *input_dev,
 		      const struct ir_scancode_table *rc_tab,
-		      const struct ir_dev_props *props,
+		      struct ir_dev_props *props,
 		      const char *driver_name)
 {
 	struct ir_input_dev *ir_dev;
diff --git a/drivers/media/IR/ir-raw-event.c b/drivers/media/IR/ir-raw-event.c
index c6a80b3..bdf2ed8 100644
--- a/drivers/media/IR/ir-raw-event.c
+++ b/drivers/media/IR/ir-raw-event.c
@@ -129,6 +129,92 @@ int ir_raw_event_store_edge(struct input_dev *input_dev, enum raw_event_type typ
 EXPORT_SYMBOL_GPL(ir_raw_event_store_edge);
 
 /**
+ * ir_raw_event_store_with_filter() - pass next pulse/space to decoders with some processing
+ * @input_dev:	the struct input_dev device descriptor
+ * @type:	the type of the event that has occurred
+ *
+ * This routine (which may be called from an interrupt context) is used to
+ * store the beginning of an ir pulse or space (or the start/end of ir
+ * reception) for the raw ir decoding state machines.\
+ * This routine is intended for devices with limited internal buffer
+ * It automerges samples of same type, and handles timeouts
+ */
+int ir_raw_event_store_with_filter(struct input_dev *input_dev,
+						struct ir_raw_event *ev)
+{
+	struct ir_input_dev *ir = input_get_drvdata(input_dev);
+	struct ir_raw_event_ctrl *raw = ir->raw;
+
+	if (!ir->raw || !ir->props)
+		return -EINVAL;
+
+	/* Ignore spaces in idle mode */
+	if (ir->idle && !ev->pulse)
+		return 0;
+	else if (ir->idle)
+		ir_raw_event_set_idle(input_dev, 0);
+
+	if (!raw->current_sample.duration) {
+		raw->current_sample = *ev;
+	} else if (ev->pulse == raw->current_sample.pulse) {
+		raw->current_sample.duration += ev->duration;
+	} else {
+		ir_raw_event_store(input_dev, &raw->current_sample);
+		raw->current_sample = *ev;
+	}
+
+	/* Enter idle mode if nessesary */
+	if (!ev->pulse && ir->props->timeout &&
+		raw->current_sample.duration >= ir->props->timeout)
+		ir_raw_event_set_idle(input_dev, 1);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ir_raw_event_store_with_filter);
+
+
+void ir_raw_event_set_idle(struct input_dev *input_dev, int idle)
+{
+	struct ir_input_dev *ir = input_get_drvdata(input_dev);
+	struct ir_raw_event_ctrl *raw = ir->raw;
+	ktime_t now;
+	u64 delta;
+
+	if (!ir->props)
+		return;
+
+	if (!ir->raw)
+		goto out;
+
+	if (idle) {
+		IR_dprintk(2, "enter idle mode\n");
+		raw->last_event = ktime_get();
+	} else {
+		IR_dprintk(2, "exit idle mode\n");
+
+		now = ktime_get();
+		delta = ktime_to_ns(ktime_sub(now, ir->raw->last_event));
+
+		WARN_ON(raw->current_sample.pulse);
+
+		raw->current_sample.duration =
+			min(raw->current_sample.duration + delta,
+						(u64)IR_MAX_DURATION);
+
+		ir_raw_event_store(input_dev, &raw->current_sample);
+
+		if (raw->current_sample.duration == IR_MAX_DURATION)
+			ir_raw_event_reset(input_dev);
+
+		raw->current_sample.duration = 0;
+	}
+out:
+	if (ir->props->s_idle)
+		ir->props->s_idle(ir->props->priv, idle);
+	ir->idle = idle;
+}
+EXPORT_SYMBOL_GPL(ir_raw_event_set_idle);
+
+/**
  * ir_raw_event_handle() - schedules the decoding of stored ir data
  * @input_dev:	the struct input_dev device descriptor
  *
diff --git a/include/media/ir-core.h b/include/media/ir-core.h
index 513e60d..e895054 100644
--- a/include/media/ir-core.h
+++ b/include/media/ir-core.h
@@ -41,6 +41,9 @@ enum rc_driver_type {
  *	anything with it. Yet, as the same keycode table can be used with other
  *	devices, a mask is provided to allow its usage. Drivers should generally
  *	leave this field in blank
+ * @timeout: optional time after which device stops sending data
+ * @min_timeout: minimum timeout supported by device
+ * @max_timeout: maximum timeout supported by device
  * @priv: driver-specific data, to be used on the callbacks
  * @change_protocol: allow changing the protocol used on hardware decoders
  * @open: callback to allow drivers to enable polling/irq when IR input device
@@ -50,11 +53,19 @@ enum rc_driver_type {
  * @s_tx_mask: set transmitter mask (for devices with multiple tx outputs)
  * @s_tx_carrier: set transmit carrier frequency
  * @tx_ir: transmit IR
+ * @s_idle: optional: enable/disable hardware idle mode, upon which,
+	device doesn't interrupt host untill it sees IR data
  */
 struct ir_dev_props {
 	enum rc_driver_type	driver_type;
 	unsigned long		allowed_protos;
 	u32			scanmask;
+
+	u64			timeout;
+	u64			min_timeout;
+	u64			max_timeout;
+
+
 	void			*priv;
 	int			(*change_protocol)(void *priv, u64 ir_type);
 	int			(*open)(void *priv);
@@ -62,6 +73,7 @@ struct ir_dev_props {
 	int			(*s_tx_mask)(void *priv, u32 mask);
 	int			(*s_tx_carrier)(void *priv, u32 carrier);
 	int			(*tx_ir)(void *priv, int *txbuf, u32 n);
+	void			(*s_idle) (void *priv, int enable);
 };
 
 struct ir_input_dev {
@@ -69,9 +81,10 @@ struct ir_input_dev {
 	char				*driver_name;	/* Name of the driver module */
 	struct ir_scancode_table	rc_tab;		/* scan/key table */
 	unsigned long			devno;		/* device number */
-	const struct ir_dev_props	*props;		/* Device properties */
+	struct ir_dev_props		*props;		/* Device properties */
 	struct ir_raw_event_ctrl	*raw;		/* for raw pulse/space events */
 	struct input_dev		*input_dev;	/* the input device associated with this device */
+	bool				idle;
 
 	/* key info - needed by IR keycode handlers */
 	spinlock_t			keylock;	/* protects the below members */
@@ -95,12 +108,12 @@ enum raw_event_type {
 /* From ir-keytable.c */
 int __ir_input_register(struct input_dev *dev,
 		      const struct ir_scancode_table *ir_codes,
-		      const struct ir_dev_props *props,
+		      struct ir_dev_props *props,
 		      const char *driver_name);
 
 static inline int ir_input_register(struct input_dev *dev,
 		      const char *map_name,
-		      const struct ir_dev_props *props,
+		      struct ir_dev_props *props,
 		      const char *driver_name) {
 	struct ir_scancode_table *ir_codes;
 	struct ir_input_dev *ir_dev;
@@ -144,6 +157,11 @@ struct ir_raw_event {
 void ir_raw_event_handle(struct input_dev *input_dev);
 int ir_raw_event_store(struct input_dev *input_dev, struct ir_raw_event *ev);
 int ir_raw_event_store_edge(struct input_dev *input_dev, enum raw_event_type type);
+int ir_raw_event_store_with_filter(struct input_dev *input_dev,
+						struct ir_raw_event *ev);
+
+void ir_raw_event_set_idle(struct input_dev *input_dev, int idle);
+
 static inline void ir_raw_event_reset(struct input_dev *input_dev)
 {
 	struct ir_raw_event ev = { .pulse = false, .duration = 0 };
-- 
1.7.0.4