This patch introduces a binary read-only sysfs attribute last_raw_packet
to expose the most recent raw packet to userspace.
Signed-off-by: Heiner Kallweit <hkallweit1@xxxxxxxxx>
---
drivers/media/rc/rc-main.c | 53 ++++++++++++++++++++++++++++++++++++++++++++++
include/media/rc-core.h | 2 +-
2 files changed, 54 insertions(+), 1 deletion(-)
diff --git a/drivers/media/rc/rc-main.c b/drivers/media/rc/rc-main.c
index 1042fa3..1b1ae6d 100644
--- a/drivers/media/rc/rc-main.c
+++ b/drivers/media/rc/rc-main.c
@@ -1246,6 +1246,47 @@ unlock:
return (ret < 0) ? ret : len;
}
+/**
+ * last_raw_packet_read() - shows the most recent packet of raw bytes
+ * This is a binary attribute.
+ *
+ * This routine is a callback routine to read the most recent packet of
+ * raw bytes received.
+ * It is triggered by reading /sys/class/rc/rc?/last_raw_packet.
+ * Most recent means up to BUF_SYSFS_LRP_SZ bytes after the last break
+ * of at least RESTART_SYSFS_LRP_MS milliseconds.
+ *
+ * Primary use is assembling a wakeup sequence for chips supporting this
+ * feature (e.g. nuvoton-cir). Apart from that it can be used for
+ * debugging purposes.
+ */
+static ssize_t last_raw_packet_read(struct file *fp, struct kobject *kobj,
+ struct bin_attribute *attr, char *buf,
+ loff_t off, size_t count)
+{
+ struct device *dev = kobj_to_dev(kobj);
+ struct rc_dev *rc_dev = to_rc_dev(dev);
+ unsigned long flags;
+ size_t cnt;
+
+ if (!rc_dev->raw)
+ return 0;
+
+ spin_lock_irqsave(&rc_dev->raw->lock, flags);
+
+ if (off >= rc_dev->raw->buf_sysfs_lrp_cnt) {
+ spin_unlock_irqrestore(&rc_dev->raw->lock, flags);
+ return 0;
+ }
+
+ cnt = min_t(size_t, count, rc_dev->raw->buf_sysfs_lrp_cnt - off);
+ memcpy(buf, rc_dev->raw->buf_sysfs_lrp + off, cnt);
+
+ spin_unlock_irqrestore(&rc_dev->raw->lock, flags);
+
+ return cnt;
+}
+
static void rc_dev_release(struct device *device)
{
}
@@ -1284,6 +1325,7 @@ static RC_FILTER_ATTR(wakeup_filter, S_IRUGO|S_IWUSR,
show_filter, store_filter, RC_FILTER_WAKEUP, false);
static RC_FILTER_ATTR(wakeup_filter_mask, S_IRUGO|S_IWUSR,
show_filter, store_filter, RC_FILTER_WAKEUP, true);
+static BIN_ATTR_RO(last_raw_packet, BUF_SYSFS_LRP_SZ);
static struct attribute *rc_dev_protocol_attrs[] = {
&dev_attr_protocols.attr.attr,
@@ -1323,6 +1365,15 @@ static struct attribute_group rc_dev_wakeup_filter_attr_grp = {
.attrs = rc_dev_wakeup_filter_attrs,
};
+static struct bin_attribute *rc_dev_raw_lrp_attrs[] = {
+ &bin_attr_last_raw_packet,
+ NULL,
+};
+
+static struct attribute_group rc_dev_raw_lrp_attr_grp = {
+ .bin_attrs = rc_dev_raw_lrp_attrs,
+};
+
static struct device_type rc_dev_type = {
.release = rc_dev_release,
.uevent = rc_dev_uevent,
@@ -1417,6 +1468,8 @@ int rc_register_device(struct rc_dev *dev)
dev->sysfs_groups[attr++] = &rc_dev_wakeup_filter_attr_grp;
if (dev->change_wakeup_protocol)
dev->sysfs_groups[attr++] = &rc_dev_wakeup_protocol_attr_grp;
+ if (dev->enable_sysfs_lrp)
+ dev->sysfs_groups[attr++] = &rc_dev_raw_lrp_attr_grp;
dev->sysfs_groups[attr++] = NULL;
/*
diff --git a/include/media/rc-core.h b/include/media/rc-core.h
index 9542891..e2d89ea 100644
--- a/include/media/rc-core.h
+++ b/include/media/rc-core.h
@@ -122,7 +122,7 @@ enum rc_filter_type {
*/
struct rc_dev {
struct device dev;
- const struct attribute_group *sysfs_groups[5];
+ const struct attribute_group *sysfs_groups[6];
const char *input_name;
const char *input_phys;
struct input_id input_id;
--
2.7.0
--
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