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media: rc: make scancodes 64 bit

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There are many protocols that encode more than 32 bit. We want 64 bit
support so that BPF IR decoders can decode more than 32 bit. None of
the existing kernel IR decoders/encoders support 64 bit, for now.

The MSC_SCAN event can only contain 32 bit scancodes, so we only generate
MSC_SCAN events if the scancode fits into 32 bits. The full 64 bit
scancode can be read from the lirc chardev.

Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Sean Young
2020-01-17 17:46:36 +01:00
committed by Mauro Carvalho Chehab
parent 00c43088aa
commit e6c6d7d4a1
5 changed files with 65 additions and 39 deletions
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7
drivers/media/rc/lirc_dev.c
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@@ -269,12 +269,7 @@ static ssize_t ir_lirc_transmit_ir(struct file *file, const char __user *buf,
goto out_unlock;
}
/*
* The scancode field in lirc_scancode is 64-bit simply
* to future-proof it, since there are IR protocols encode
* use more than 32 bits. For now only 32-bit protocols
* are supported.
*/
/* We only have encoders for 32-bit protocols. */
if (scan.scancode > U32_MAX ||
!rc_validate_scancode(scan.rc_proto, scan.scancode)) {
ret = -EINVAL;