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Geert Uytterhoeven 6caab6c96b auxdisplay: ht16k33: Fix frame buffer device blanking

[ Upstream commit 840fe25833 ]

As the ht16k33 frame buffer sub-driver does not register an
fb_ops.fb_blank() handler, blanking does not work:

    $ echo 1 > /sys/class/graphics/fb0/blank
    sh: write error: Invalid argument

Fix this by providing a handler that always returns zero, to make sure
blank events will be sent to the actual device handling the backlight.

Reported-by: Robin van der Gracht <robin@protonic.nl>
Suggested-by: Robin van der Gracht <robin@protonic.nl>
Fixes: 8992da44c6 ("auxdisplay: ht16k33: Driver for LED controller")
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2021-11-18 14:04:24 +01:00

arm-charlcd.c

auxdisplay: Replace HTTP links with HTTPS ones

2020-08-08 16:10:03 +02:00

cfag12864b.c

treewide: kmalloc() -> kmalloc_array()

2018-06-12 16:19:22 -07:00

cfag12864bfb.c

auxdisplay: constify fb ops

2019-12-11 12:31:39 +02:00

charlcd.c

auxdisplay: charlcd: Reuse hex_to_bin() instead of custom code