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auxdisplay: charlcd: make backlight initial state configurable

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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;