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cm: charger: Add support for double backlight displays 

* Some devices using AMS AS36xx LEDs controllers
    are using 2 backlight paths to light the display,
    mostly on Sony Huashan and Sony Blue board devices

 * Although most of the displays have interlaced backlights
    and the half dark path can be hard to see, other displays
    have a top / bottom path that make half the screen on / off

 * Control the backlight level of both path if the device does have
    BACKLIGHT_PATH set, and if present, SECONDARY_BACKLIGHT_PATH

 * Leave the HEALTD_BACKLIGHT_LEVEL config accessible
    to override the default 100 / 255 brightness used in healthd

Change-Id: If774c3e66acedddf7ba676581e7c88b7e83a66b6
Signed-off-by: Adrian DC <radian.dc@gmail.com>
This commit is contained in:
Adrian DC 2016-08-14 11:44:31 +02:00 committed by Steve Kondik
parent 7595620750
commit cadd0be089
2 changed files with 49 additions and 0 deletions
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9
charger/Android.mk
View File

@ -7,6 +7,15 @@ LOCAL_CFLAGS := -Werror
LOCAL_C_INCLUDES := \
system/core/healthd \
bootable/recovery
ifneq ($(BACKLIGHT_PATH),)
LOCAL_CFLAGS += -DHEALTHD_BACKLIGHT_PATH=\"$(BACKLIGHT_PATH)\"
endif
ifneq ($(SECONDARY_BACKLIGHT_PATH),)
LOCAL_CFLAGS += -DHEALTHD_SECONDARY_BACKLIGHT_PATH=\"$(SECONDARY_BACKLIGHT_PATH)\"
endif
ifneq ($(HEALTHD_BACKLIGHT_LEVEL),)
LOCAL_CFLAGS += -DHEALTHD_BACKLIGHT_LEVEL=$(HEALTHD_BACKLIGHT_LEVEL)
endif
include $(BUILD_STATIC_LIBRARY)
include $(CLEAR_VARS)

40
charger/healthd_board_cm.cpp
View File

@ -365,9 +365,49 @@ void healthd_board_mode_charger_battery_update(
{
}
#ifdef HEALTHD_BACKLIGHT_PATH
#ifndef HEALTHD_BACKLIGHT_LEVEL
#define HEALTHD_BACKLIGHT_LEVEL 100
#endif
void healthd_board_mode_charger_set_backlight(bool on)
{
int fd;
char buffer[10];
memset(buffer, '\0', sizeof(buffer));
fd = open(HEALTHD_BACKLIGHT_PATH, O_RDWR);
if (fd < 0) {
LOGE("Could not open backlight node : %s\n", strerror(errno));
return;
}
LOGV("Enabling backlight\n");
snprintf(buffer, sizeof(buffer), "%d\n", on ? HEALTHD_BACKLIGHT_LEVEL : 0);
if (write(fd, buffer, strlen(buffer)) < 0) {
LOGE("Could not write to backlight : %s\n", strerror(errno));
}
close(fd);
#ifdef HEALTHD_SECONDARY_BACKLIGHT_PATH
fd = open(HEALTHD_SECONDARY_BACKLIGHT_PATH, O_RDWR);
if (fd < 0) {
LOGE("Could not open second backlight node : %s\n", strerror(errno));
return;
}
LOGV("Enabling secondary backlight\n");
if (write(fd, buffer, strlen(buffer)) < 0) {
LOGE("Could not write to second backlight : %s\n", strerror(errno));
return;
}
close(fd);
#endif
}
#else
void healthd_board_mode_charger_set_backlight(bool)
{
}
#endif
void healthd_board_mode_charger_init(void)
{