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authorSean Young <sean@mess.org>2017-12-11 17:12:09 -0500
committerMauro Carvalho Chehab <mchehab@s-opensource.com>2017-12-18 15:19:57 -0500
commitdde7edff359461d07074ef2f0c4dc85b775d493f (patch)
treed081dfb183cb520253a350ff4582d42a1a4c09dc /Documentation/media
parentfb7ccc61802a7845ba1caa7e5c1f7fa8a62a2d80 (diff)
media: lirc: when transmitting scancodes, block until transmit is done
The semantics for lirc IR transmit with raw IR is that the write call should block until the IR is transmitted. Some drivers have no idea when this actually is (e.g. mceusb), so there is a wait. This is useful for userspace, as it might want to send a IR button press, a gap of a predefined number of milliseconds, and then send a repeat message. It turns out that for transmitting scancodes this feature is even more useful, as user space has no idea how long the IR is. So, maintain the existing semantics for IR scancode transmit. Signed-off-by: Sean Young <sean@mess.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Diffstat (limited to 'Documentation/media')
-rw-r--r--Documentation/media/uapi/rc/lirc-write.rst4
1 files changed, 2 insertions, 2 deletions
diff --git a/Documentation/media/uapi/rc/lirc-write.rst b/Documentation/media/uapi/rc/lirc-write.rst
index dd3d1fe807a6..d4566b0a2015 100644
--- a/Documentation/media/uapi/rc/lirc-write.rst
+++ b/Documentation/media/uapi/rc/lirc-write.rst
@@ -60,8 +60,8 @@ When in :ref:`LIRC_MODE_SCANCODE <lirc-mode-scancode>` mode, one
and the protocol in the :c:type:`rc_proto`: member. All other members must be
set to 0, else ``EINVAL`` is returned. If there is no protocol encoder
for the protocol or the scancode is not valid for the specified protocol,
-``EINVAL`` is returned. The write function may not wait until the scancode
-is transmitted.
+``EINVAL`` is returned. The write function blocks until the scancode
+is transmitted by the hardware.
Return Value