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Commit 0fa95189 authored by Fenglin Wu's avatar Fenglin Wu Committed by Steve Kondik
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healthd: charger: Add tricolor led to indicate battery capacity 

Add led to indicate battery capacity when doing off mode charging. The
led behavior is design as below:
   i. 	Shows red led if capacity is lower than 15%.
   ii.	Shows yellow (red + green) led if capacity is
	lower than 90% but higher than 15%.
   iii. Shows green led if capacity is higher than 90%.

Change-Id: If637defec8a04e859b00a6492ec1f95d6bff2200
parent b5c316ed

healthd/healthd_mode_charger.cpp

+87 −0
Original line number Diff line number Diff line
@@ -73,6 +73,9 @@ char *locale; 
#define LAST_KMSG_PATH          "/proc/last_kmsg"

#define LAST_KMSG_PSTORE_PATH   "/sys/fs/pstore/console-ramoops"

#define LAST_KMSG_MAX_SZ        (32 * 1024)

#define RED_LED_PATH            "/sys/class/leds/red/brightness"

#define GREEN_LED_PATH          "/sys/class/leds/green/brightness"

#define BLUE_LED_PATH           "/sys/class/leds/blue/brightness"



#define LOGE(x...) do { KLOG_ERROR("charger", x); } while (0)

#define LOGI(x...) do { KLOG_INFO("charger", x); } while (0)
@@ -169,12 +172,87 @@ static struct animation battery_animation = { 
    .capacity = 0,

};



enum {

    RED_LED = 0x01 << 0,

    GREEN_LED = 0x01 << 1,

    BLUE_LED = 0x01 << 2,

};



struct led_ctl {

    int color;

    const char *path;

};



struct led_ctl leds[3] =

    {{RED_LED, RED_LED_PATH},

    {GREEN_LED, GREEN_LED_PATH},

    {BLUE_LED, BLUE_LED_PATH}};



struct soc_led_color_mapping {

    int soc;

    int color;

};



struct soc_led_color_mapping soc_leds[3] = {

    {15, RED_LED},

    {90, RED_LED | GREEN_LED},

    {100, GREEN_LED},

};



static struct charger charger_state;



static int char_width;

static int char_height;

static bool minui_inited;



static int set_tricolor_led(int on, int color)

{

    int fd, i;

    char buffer[10];



    for (i = 0; i < (int)ARRAY_SIZE(leds); i++) {

        if ((color & leds[i].color) && (access(leds[i].path, R_OK | W_OK) == 0)) {

            fd = open(leds[i].path, O_RDWR);

            if (fd < 0) {

                LOGE("Could not open red led node\n");

                goto cleanup;

            }

            if (on)

                snprintf(buffer, sizeof(int), "%d\n", 255);

            else

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



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

                LOGE("Could not write to led node\n");

cleanup:

            if (fd >= 0)

                close(fd);

        }

    }



    return 0;

}



static int set_battery_soc_leds(int soc)

{

    int i, color;

    static int old_color = 0;



    for (i = 0; i < (int)ARRAY_SIZE(soc_leds); i++) {

        if (soc < soc_leds[i].soc)

            break;

    }

    color = soc_leds[i].color;

    if (old_color != color) {

        set_tricolor_led(0, old_color);

        set_tricolor_led(1, color);

        old_color = color;

        LOGV("soc = %d, set led color 0x%x\n", soc, soc_leds[i].color);

    }



    return 0;

}



/* current time in milliseconds */

static int64_t curr_time_ms(void)

{
@@ -561,9 +639,18 @@ static void handle_input_state(struct charger *charger, int64_t now) 


static void handle_power_supply_state(struct charger *charger, int64_t now)

{

    static int old_soc = 0;

    int soc;



    if (!charger->have_battery_state)

        return;



    soc = get_battery_capacity();

    if (old_soc != soc) {

        old_soc = soc;

        set_battery_soc_leds(soc);

    }



    if (!charger->charger_connected) {

        request_suspend(false);

        if (charger->next_pwr_check == -1) {