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-rw-r--r--drivers/auxdisplay/Kconfig21
-rw-r--r--drivers/auxdisplay/charlcd.c10
2 files changed, 30 insertions, 1 deletions
diff --git a/drivers/auxdisplay/Kconfig b/drivers/auxdisplay/Kconfig
index 7d3fe27d6868..c52c738e554a 100644
--- a/drivers/auxdisplay/Kconfig
+++ b/drivers/auxdisplay/Kconfig
@@ -445,6 +445,27 @@ config PANEL_BOOT_MESSAGE
An empty message will only clear the display at driver init time. Any other
printf()-formatted message is valid with newline and escape codes.
+choice
+ prompt "Backlight initial state"
+ default CHARLCD_BL_FLASH
+
+ config CHARLCD_BL_OFF
+ bool "Off"
+ help
+ Backlight is initially turned off
+
+ config CHARLCD_BL_ON
+ bool "On"
+ help
+ Backlight is initially turned on
+
+ config CHARLCD_BL_FLASH
+ bool "Flash"
+ help
+ Backlight is flashed briefly on init
+
+endchoice
+
endif # AUXDISPLAY
config PANEL
diff --git a/drivers/auxdisplay/charlcd.c b/drivers/auxdisplay/charlcd.c
index 5212675564d7..92745efefb54 100644
--- a/drivers/auxdisplay/charlcd.c
+++ b/drivers/auxdisplay/charlcd.c
@@ -769,6 +769,14 @@ static void charlcd_puts(struct charlcd *lcd, const char *s)
#define LCD_INIT_TEXT "Linux-" UTS_RELEASE "\n"
#endif
+#ifdef CONFIG_CHARLCD_BL_ON
+#define LCD_INIT_BL "\x1b[L+"
+#elif defined(CONFIG_CHARLCD_BL_FLASH)
+#define LCD_INIT_BL "\x1b[L*"
+#else
+#define LCD_INIT_BL "\x1b[L-"
+#endif
+
/* initialize the LCD driver */
static int charlcd_init(struct charlcd *lcd)
{
@@ -790,7 +798,7 @@ static int charlcd_init(struct charlcd *lcd)
return ret;
/* display a short message */
- charlcd_puts(lcd, "\x1b[Lc\x1b[Lb\x1b[L*" LCD_INIT_TEXT);
+ charlcd_puts(lcd, "\x1b[Lc\x1b[Lb" LCD_INIT_BL LCD_INIT_TEXT);
/* clear the display on the next device opening */
priv->must_clear = true;