Add functionality to the core to store the most recent raw packet.
It's used to expose this data via sysfs.
To use this functionality a driver has to set enable_sysfs_lrp
in struct rc_dev and add a call to ir_raw_store_sysfs_lrp
for storing a raw byte into the buffer.
Signed-off-by: Heiner Kallweit <hkallweit1@xxxxxxxxx>
---
drivers/media/rc/rc-core-priv.h | 6 ++++++
drivers/media/rc/rc-ir-raw.c | 34 ++++++++++++++++++++++++++++++++++
include/media/rc-core.h | 3 +++
3 files changed, 43 insertions(+)
diff --git a/drivers/media/rc/rc-core-priv.h b/drivers/media/rc/rc-core-priv.h
index 585d5e5..6193883 100644
--- a/drivers/media/rc/rc-core-priv.h
+++ b/drivers/media/rc/rc-core-priv.h
@@ -19,6 +19,8 @@
/* Define the max number of pulse/space transitions to buffer */
#define MAX_IR_EVENT_SIZE 512
+#define BUF_SYSFS_LRP_SZ 128
+
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <media/rc-core.h>
@@ -43,6 +45,10 @@ struct ir_raw_event_ctrl {
ktime_t last_event; /* when last event occurred */
enum raw_event_type last_type; /* last event type */
struct rc_dev *dev; /* pointer to the parent rc_dev */
+ /* used for exposing the last raw packets via sysfs */
+ u8 buf_sysfs_lrp[BUF_SYSFS_LRP_SZ];
+ unsigned buf_sysfs_lrp_cnt;
+ ktime_t buf_sysfs_lrp_last;
/* raw decoder state follows */
struct ir_raw_event prev_ev;
diff --git a/drivers/media/rc/rc-ir-raw.c b/drivers/media/rc/rc-ir-raw.c
index 144304c..6bf2b56 100644
--- a/drivers/media/rc/rc-ir-raw.c
+++ b/drivers/media/rc/rc-ir-raw.c
@@ -20,6 +20,8 @@
#include <linux/freezer.h>
#include "rc-core-priv.h"
+#define RESTART_SYSFS_LRP_MS 1000
+
/* Used to keep track of IR raw clients, protected by ir_raw_handler_lock */
static LIST_HEAD(ir_raw_client_list);
@@ -66,6 +68,38 @@ static int ir_raw_event_thread(void *data)
}
/**
+ * ir_raw_store_sysfs_lrp() - pass a raw byte to sysfs buffer
+ * @dev: the struct rc_dev device descriptor
+ * @val: the raw value to store
+ *
+ * This routine (which may be called from interrupt context) stores a
+ * raw byte in the sysfs buffer. It only needs to be called if the most
+ * recent series of raw bytes should be available via sysfs.
+ */
+void ir_raw_store_sysfs_lrp(struct rc_dev *dev, u8 val)
+{
+ ktime_t now;
+ struct ir_raw_event_ctrl *raw = dev->raw;
+
+ if (!raw || !dev->enable_sysfs_lrp)
+ return;
+
+ now = ktime_get();
+ spin_lock(&raw->lock);
+
+ if (ktime_ms_delta(now, raw->buf_sysfs_lrp_last) >
+ RESTART_SYSFS_LRP_MS)
+ raw->buf_sysfs_lrp_cnt = 0;
+ raw->buf_sysfs_lrp_last = now;
+
+ if (raw->buf_sysfs_lrp_cnt < BUF_SYSFS_LRP_SZ)
+ raw->buf_sysfs_lrp[raw->buf_sysfs_lrp_cnt++] = val;
+
+ spin_unlock(&raw->lock);
+}
+EXPORT_SYMBOL_GPL(ir_raw_store_sysfs_lrp);
+
+/**
* ir_raw_event_store() - pass a pulse/space duration to the raw ir decoders
* @dev: the struct rc_dev device descriptor
* @ev: the struct ir_raw_event descriptor of the pulse/space
diff --git a/include/media/rc-core.h b/include/media/rc-core.h
index f649470..9542891 100644
--- a/include/media/rc-core.h
+++ b/include/media/rc-core.h
@@ -71,6 +71,7 @@ enum rc_filter_type {
* anyone can call show_protocols or store_protocols
* @minor: unique minor remote control device number
* @raw: additional data for raw pulse/space devices
+ * @enable_sysfs_lrp: expose last raw packets via sysfs
* @input_dev: the input child device used to communicate events to userspace
* @driver_type: specifies if protocol decoding is done in hardware or software
* @idle: used to keep track of RX state
@@ -131,6 +132,7 @@ struct rc_dev {
struct mutex lock;
unsigned int minor;
struct ir_raw_event_ctrl *raw;
+ bool enable_sysfs_lrp;
struct input_dev *input_dev;
enum rc_driver_type driver_type;
bool idle;
@@ -246,6 +248,7 @@ static inline void init_ir_raw_event(struct ir_raw_event *ev)
#define MS_TO_NS(msec) ((msec) * 1000 * 1000)
void ir_raw_event_handle(struct rc_dev *dev);
+void ir_raw_store_sysfs_lrp(struct rc_dev *dev, u8 val);
int ir_raw_event_store(struct rc_dev *dev, struct ir_raw_event *ev);
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,
--
2.7.0
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