kernel/linux.git/drivers/media/platform/cec-gpio, branch linux-4.16.yLinux kernel stable tree (mirror)https://git.radix-linux.su/kernel/linux.git/atom?h=linux-4.16.y2017-10-04T20:04:18+00:00[media] cec-gpio: don't generate spurious HPD events2017-10-04T20:04:18+00:00Hans Verkuilhverkuil@xs4all.nl2017-09-25T08:02:57+00:00urn:sha1:5b2c8da1b040c4608c7cfdc0dd96bcaa190af268
Only send HPD_LOW/HIGH event if the gpio actually changed value.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
media: cec-gpio: add HDMI CEC GPIO driver2017-09-23T11:51:44+00:00Hans Verkuilhans.verkuil@cisco.com2017-06-28T08:14:28+00:00urn:sha1:1e33936d3baee3b688ec12b372534522b9256032
Add a simple HDMI CEC GPIO driver that sits on top of the cec-pin framework.
While I have heard of SoCs that use the GPIO pin for CEC (apparently an
early RockChip SoC used that), the main use-case of this driver is to
function as a debugging tool.
By connecting the CEC line to a GPIO pin on a Raspberry Pi 3 for example
it turns it into a CEC debugger and protocol analyzer.
With 'cec-ctl --monitor-pin' the CEC traffic can be analyzed.
But of course it can also be used with any hardware project where the
HDMI CEC line is hooked up to a pull-up gpio line.
In addition this has (optional) support for tracing HPD changes if the
HPD is connected to a GPIO.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>