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auxdisplay: charlcd: make backlight initial state configurable 

The charlcd driver currently flashes the backlight once on init.
This may not be desirable.  Thus, add options for turning the
backlight off or on as well.

Signed-off-by: Mans Rullgard <mans@mansr.com>
Signed-off-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
This commit is contained in:
Mans Rullgard 2019-03-01 18:48:16 +00:00 committed by Miguel Ojeda
parent c917172245
commit cc5d04d840
2 changed files with 30 additions and 1 deletions
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21
drivers/auxdisplay/Kconfig
View File

@ -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

10
drivers/auxdisplay/charlcd.c
View File

@ -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;