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media: lirc: report ir receiver overflow

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If the driver reports that the hardware had an overflow, report this to
userspace. It would be nice to know when this happens, and not just get
a long space.

This change has been tested with lircd, ir-ctl, and ir-keytable.

Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Sean Young
2022-01-15 11:19:11 +01:00
committed by Mauro Carvalho Chehab
parent 950170d6d2
commit 68a99f6a0e
5 changed files with 30 additions and 14 deletions
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13
drivers/media/rc/lirc_dev.c
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@@ -44,14 +44,13 @@ void lirc_raw_event(struct rc_dev *dev, struct ir_raw_event ev)
/* Receiver overflow, data missing */
if (ev.overflow) {
/*
* Userspace expects a long space event before the start of
* the signal to use as a sync. This may be done with repeat
* packets and normal samples. But if an overflow has been sent
* then we assume that a long time has passed, so we send a
* space with the maximum time value.
* Send lirc overflow message. This message is unknown to
* lircd, but it will interpret this as a long space as
* long as the value is set to high value. This resets its
* decoder state.
*/
sample = LIRC_SPACE(LIRC_VALUE_MASK);
dev_dbg(&dev->dev, "delivering overflow space to lirc_dev\n");
sample = LIRC_OVERFLOW(LIRC_VALUE_MASK);
dev_dbg(&dev->dev, "delivering overflow to lirc_dev\n");
/* Carrier reports */
} else if (ev.carrier_report) {