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/*
* batt_leds.c - WonderMedia Battery LED Driver.
*
* Copyright (C) 2013 WonderMedia Technologies, Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/leds.h>
#include <linux/rtc.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/gpio.h>
#include <mach/wmt_iomux.h>
#include <mach/wmt_env.h>
enum {
LED_GREEN = 0,
LED_RED,
};
struct batt_led_trigger {
char *name;
struct led_trigger *trigger;
};
#define RTC_NAME "rtc0"
static struct rtc_device *rtc_dev = NULL;
static bool battery_led_registered = false;
static struct batt_led_trigger batt_led_triggers[] = {
[LED_GREEN] = {
.name = "bat-green",
},
[LED_RED] = {
.name = "bat-red",
}
};
static struct gpio_led batt_leds[] = {
[LED_GREEN] = {
.name = "bat-green",
.default_trigger = "bat-green",
.retain_state_suspended = 1,
.active_low = 0,
},
[LED_RED] = {
.name = "bat-red",
.default_trigger = "bat-red",
.retain_state_suspended = 1,
.active_low = 0,
},
};
static struct gpio_led_platform_data batt_leds_data = {
.leds = batt_leds,
.num_leds = ARRAY_SIZE(batt_leds),
};
static struct platform_device batt_leds_dev = {
.name = "leds-gpio",
.id = -1,
.dev = {
.platform_data = &batt_leds_data,
},
};
static int parse_battery_led_param(void)
{
char env[] = "wmt.charger.led";
char s[64];
size_t l = sizeof(s);
int id, r, g;
if (wmt_getsyspara(env, s, &l))
return -EINVAL;
if (sscanf(s, "%d:%d:%d", &id, &r, &g) != 3)
return -EINVAL;
if (id != 1 || !gpio_is_valid(r) || !gpio_is_valid(g))
return -EINVAL;
batt_leds[LED_GREEN].gpio = g;
batt_leds[LED_RED].gpio = r;
pr_info("charger-led: charging (gpio%d), full (gpio%d)\n", r, g);
return 0;
}
int batt_leds_update(int status)
{
struct led_trigger *r = batt_led_triggers[LED_RED].trigger;
struct led_trigger *g = batt_led_triggers[LED_GREEN].trigger;
if (battery_led_registered == false)
return 0;
switch (status) {
case POWER_SUPPLY_STATUS_CHARGING:
led_trigger_event(r, LED_FULL);
led_trigger_event(g, LED_OFF);
gpio_direction_input(batt_leds[LED_GREEN].gpio);
break;
case POWER_SUPPLY_STATUS_FULL:
led_trigger_event(r, LED_OFF);
led_trigger_event(g, LED_FULL);
break;
case POWER_SUPPLY_STATUS_DISCHARGING:
default:
led_trigger_event(r, LED_OFF);
led_trigger_event(g, LED_OFF);
gpio_direction_input(batt_leds[LED_GREEN].gpio);
break;
}
return 0;
}
void batt_leds_suspend_prepare(void)
{
struct rtc_wkalrm tmp;
unsigned long time, now;
//unsigned long add = 30; /* seconds */
unsigned long add = 120; /* seconds */
if (battery_led_registered == false)
return;
if (!rtc_dev) {
rtc_dev = rtc_class_open(RTC_NAME);
if (IS_ERR_OR_NULL(rtc_dev)) {
rtc_dev = NULL;
pr_err("Cannot get RTC %s, %ld.\n", RTC_NAME, PTR_ERR(rtc_dev));
return;
}
}
tmp.enabled = 1;
rtc_read_time(rtc_dev, &tmp.time);
rtc_tm_to_time(&tmp.time, &now);
time = now + add;
rtc_time_to_tm(time, &tmp.time);
rtc_set_alarm(rtc_dev, &tmp);
}
void batt_leds_resume_complete(void)
{
if (rtc_dev) {
rtc_class_close(rtc_dev);
rtc_dev = NULL;
}
}
int batt_leds_setup(void)
{
int i;
if (parse_battery_led_param())
return -EINVAL;
platform_device_register(&batt_leds_dev);
for (i = 0; i < ARRAY_SIZE(batt_led_triggers); ++i)
led_trigger_register_simple(batt_led_triggers[i].name,
&batt_led_triggers[i].trigger);
battery_led_registered = true;
return 0;
}
void batt_leds_cleanup(void)
{
int i;
if (battery_led_registered == true) {
platform_device_unregister(&batt_leds_dev);
for (i = 0; i < ARRAY_SIZE(batt_led_triggers); ++i)
led_trigger_unregister_simple(batt_led_triggers[i].trigger);
battery_led_registered = false;
}
}
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