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authorGeert Uytterhoeven <geert@linux-m68k.org>2021-10-19 16:45:09 +0200
committerMiguel Ojeda <ojeda@kernel.org>2021-10-21 23:36:29 +0200
commit840fe258332544aa7321921e1723d37b772af7a9 (patch)
treef95538c6157be36adfabb5592ff035b8d51f95b3 /drivers/auxdisplay
parentauxdisplay: ht16k33: Connect backlight to fbdev (diff)
downloadlinux-dev-840fe258332544aa7321921e1723d37b772af7a9.tar.xz
linux-dev-840fe258332544aa7321921e1723d37b772af7a9.zip
auxdisplay: ht16k33: Fix frame buffer device blanking
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: 8992da44c6805d53 ("auxdisplay: ht16k33: Driver for LED controller") Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Diffstat (limited to 'drivers/auxdisplay')
-rw-r--r--drivers/auxdisplay/ht16k33.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/auxdisplay/ht16k33.c b/drivers/auxdisplay/ht16k33.c
index 2b630e194570..ed5808349990 100644
--- a/drivers/auxdisplay/ht16k33.c
+++ b/drivers/auxdisplay/ht16k33.c
@@ -219,6 +219,15 @@ static const struct backlight_ops ht16k33_bl_ops = {
.check_fb = ht16k33_bl_check_fb,
};
+/*
+ * Blank events will be passed to the actual device handling the backlight when
+ * we return zero here.
+ */
+static int ht16k33_blank(int blank, struct fb_info *info)
+{
+ return 0;
+}
+
static int ht16k33_mmap(struct fb_info *info, struct vm_area_struct *vma)
{
struct ht16k33_priv *priv = info->par;
@@ -231,6 +240,7 @@ static const struct fb_ops ht16k33_fb_ops = {
.owner = THIS_MODULE,
.fb_read = fb_sys_read,
.fb_write = fb_sys_write,
+ .fb_blank = ht16k33_blank,
.fb_fillrect = sys_fillrect,
.fb_copyarea = sys_copyarea,
.fb_imageblit = sys_imageblit,