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Commit f7ce72ca authored by Ameya Thakur's avatar Ameya Thakur Committed by Steve Kondik
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charger: Toggle backlight while in charger mode. 

The backlight is now toggled on/off in the charger mode via a sysfs
node. This is to compensate for the fact that on certain targets the
FBIOBLANK ioctl does not turn off the backlight.

Change-Id: I7c4531e7f1b0599b9a1f5ed6f95d13ee6a664066
CRs-fixed: 514940
parent f7e1ef24

charger/charger.c

+40 −1
Original line number Diff line number Diff line
@@ -66,6 +66,8 @@ 


#define BATTERY_FULL_THRESH     95



#define BACKLIGHT_TOGGLE_PATH "/sys/class/leds/lcd-backlight/brightness"



#define LAST_KMSG_PATH          "/proc/last_kmsg"

#define LAST_KMSG_MAX_SZ        (32 * 1024)
@@ -193,6 +195,36 @@ static struct charger charger_state = { 
static int char_width;

static int char_height;



/*On certain targets the FBIOBLANK ioctl does not turn off the

 * backlight. In those cases we need to manually toggle it on/off

 */

static int set_backlight(int toggle)

{

        int fd;

        char buffer[10];



        memset(buffer, '\0', sizeof(buffer));

        fd = open(BACKLIGHT_TOGGLE_PATH, O_RDWR);

        if (fd < 0) {

                LOGE("Could not open backlight node : %s", strerror(errno));

                goto cleanup;

        }

        if (toggle) {

                LOGI("Enabling backlight");

                snprintf(buffer, sizeof(int), "%d\n", 100);

        } else {

                LOGI("Disabling backlight");

                snprintf(buffer, sizeof(int), "%d\n", 0);

        }

        if (write(fd, buffer,strlen(buffer)) < 0) {

                LOGE("Could not write to backlight node : %s", strerror(errno));

                goto cleanup;

        }

cleanup:

        if (fd >= 0)

                close(fd);

        return 0;

}

/* current time in milliseconds */

static int64_t curr_time_ms(void)

{
@@ -760,9 +792,12 @@ static void update_screen_state(struct charger *charger, int64_t now) 
        reset_animation(batt_anim);

        charger->next_screen_transition = -1;

        gr_fb_blank(true);

        set_backlight(false);



#ifdef ALLOW_SUSPEND_IN_CHARGER

        write_file(SYS_POWER_STATE, "mem", strlen("mem"));

#endif



        LOGV("[%lld] animation done\n", now);

        if (charger->num_supplies_online > 0)

            request_suspend(true);
@@ -796,8 +831,11 @@ static void update_screen_state(struct charger *charger, int64_t now) 
    }



    /* unblank the screen  on first cycle */

    if (batt_anim->cur_cycle == 0)

    if (batt_anim->cur_cycle == 0) {

        gr_fb_blank(false);

        set_backlight(true);

    }





    /* draw the new frame (@ cur_frame) */

    redraw_screen(charger);
@@ -1067,6 +1105,7 @@ int main(int argc, char **argv) 


#ifndef CHARGER_DISABLE_INIT_BLANK

    gr_fb_blank(true);

    set_backlight(false);

#endif



    charger->next_screen_transition = now - 1;