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-rw-r--r--drivers/power/Kconfig2
-rw-r--r--drivers/power/charger-manager.c289
2 files changed, 83 insertions, 208 deletions
diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index e2569a538501..a79f16afb588 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -315,7 +315,7 @@ config CHARGER_GPIO
config CHARGER_MANAGER
bool "Battery charger manager for multiple chargers"
- depends on REGULATOR && RTC_CLASS
+ depends on REGULATOR
select EXTCON
help
Say Y to enable charger-manager support, which allows multiple
diff --git a/drivers/power/charger-manager.c b/drivers/power/charger-manager.c
index 649052e1f2d9..14b0d85318eb 100644
--- a/drivers/power/charger-manager.c
+++ b/drivers/power/charger-manager.c
@@ -69,16 +69,10 @@ static LIST_HEAD(cm_list);
static DEFINE_MUTEX(cm_list_mtx);
/* About in-suspend (suspend-again) monitoring */
-static struct rtc_device *rtc_dev;
-/*
- * Backup RTC alarm
- * Save the wakeup alarm before entering suspend-to-RAM
- */
-static struct rtc_wkalrm rtc_wkalarm_save;
-/* Backup RTC alarm time in terms of seconds since 01-01-1970 00:00:00 */
-static unsigned long rtc_wkalarm_save_time;
+static struct alarm *cm_timer;
+
static bool cm_suspended;
-static bool cm_rtc_set;
+static bool cm_timer_set;
static unsigned long cm_suspend_duration_ms;
/* About normal (not suspended) monitoring */
@@ -87,9 +81,6 @@ static unsigned long next_polling; /* Next appointed polling time */
static struct workqueue_struct *cm_wq; /* init at driver add */
static struct delayed_work cm_monitor_work; /* init at driver add */
-/* Global charger-manager description */
-static struct charger_global_desc *g_desc; /* init with setup_charger_manager */
-
/**
* is_batt_present - See if the battery presents in place.
* @cm: the Charger Manager representing the battery.
@@ -1047,10 +1038,13 @@ static bool cm_setup_timer(void)
{
struct charger_manager *cm;
unsigned int wakeup_ms = UINT_MAX;
- bool ret = false;
+ int timer_req = 0;
- mutex_lock(&cm_list_mtx);
+ if (time_after(next_polling, jiffies))
+ CM_MIN_VALID(wakeup_ms,
+ jiffies_to_msecs(next_polling - jiffies));
+ mutex_lock(&cm_list_mtx);
list_for_each_entry(cm, &cm_list, entry) {
unsigned int fbchk_ms = 0;
@@ -1070,162 +1064,38 @@ static bool cm_setup_timer(void)
/* Skip if polling is not required for this CM */
if (!is_polling_required(cm) && !cm->emergency_stop)
continue;
+ timer_req++;
if (cm->desc->polling_interval_ms == 0)
continue;
CM_MIN_VALID(wakeup_ms, cm->desc->polling_interval_ms);
}
-
mutex_unlock(&cm_list_mtx);
- if (wakeup_ms < UINT_MAX && wakeup_ms > 0) {
- pr_info("Charger Manager wakeup timer: %u ms\n", wakeup_ms);
- if (rtc_dev) {
- struct rtc_wkalrm tmp;
- unsigned long time, now;
- unsigned long add = DIV_ROUND_UP(wakeup_ms, 1000);
-
- /*
- * Set alarm with the polling interval (wakeup_ms)
- * except when rtc_wkalarm_save comes first.
- * However, the alarm time should be NOW +
- * CM_RTC_SMALL or later.
- */
- tmp.enabled = 1;
- rtc_read_time(rtc_dev, &tmp.time);
- rtc_tm_to_time(&tmp.time, &now);
- if (add < CM_RTC_SMALL)
- add = CM_RTC_SMALL;
- time = now + add;
+ if (timer_req && cm_timer) {
+ ktime_t now, add;
- ret = true;
+ /*
+ * Set alarm with the polling interval (wakeup_ms)
+ * The alarm time should be NOW + CM_RTC_SMALL or later.
+ */
+ if (wakeup_ms == UINT_MAX ||
+ wakeup_ms < CM_RTC_SMALL * MSEC_PER_SEC)
+ wakeup_ms = 2 * CM_RTC_SMALL * MSEC_PER_SEC;
- if (rtc_wkalarm_save.enabled &&
- rtc_wkalarm_save_time &&
- rtc_wkalarm_save_time < time) {
- if (rtc_wkalarm_save_time < now + CM_RTC_SMALL)
- time = now + CM_RTC_SMALL;
- else
- time = rtc_wkalarm_save_time;
+ pr_info("Charger Manager wakeup timer: %u ms\n", wakeup_ms);
- /* The timer is not appointed by CM */
- ret = false;
- }
+ now = ktime_get_boottime();
+ add = ktime_set(wakeup_ms / MSEC_PER_SEC,
+ (wakeup_ms % MSEC_PER_SEC) * NSEC_PER_MSEC);
+ alarm_start(cm_timer, ktime_add(now, add));
- pr_info("Waking up after %lu secs\n", time - now);
+ cm_suspend_duration_ms = wakeup_ms;
- rtc_time_to_tm(time, &tmp.time);
- rtc_set_alarm(rtc_dev, &tmp);
- cm_suspend_duration_ms += wakeup_ms;
- return ret;
- }
+ return true;
}
-
- if (rtc_dev)
- rtc_set_alarm(rtc_dev, &rtc_wkalarm_save);
return false;
}
-static void _cm_fbchk_in_suspend(struct charger_manager *cm)
-{
- unsigned long jiffy_now = jiffies;
-
- if (!cm->fullbatt_vchk_jiffies_at)
- return;
-
- if (g_desc && g_desc->assume_timer_stops_in_suspend)
- jiffy_now += msecs_to_jiffies(cm_suspend_duration_ms);
-
- /* Execute now if it's going to be executed not too long after */
- jiffy_now += CM_JIFFIES_SMALL;
-
- if (time_after_eq(jiffy_now, cm->fullbatt_vchk_jiffies_at))
- fullbatt_vchk(&cm->fullbatt_vchk_work.work);
-}
-
-/**
- * cm_suspend_again - Determine whether suspend again or not
- *
- * Returns true if the system should be suspended again
- * Returns false if the system should be woken up
- */
-bool cm_suspend_again(void)
-{
- struct charger_manager *cm;
- bool ret = false;
-
- if (!g_desc || !g_desc->rtc_only_wakeup || !g_desc->rtc_only_wakeup() ||
- !cm_rtc_set)
- return false;
-
- if (cm_monitor())
- goto out;
-
- ret = true;
- mutex_lock(&cm_list_mtx);
- list_for_each_entry(cm, &cm_list, entry) {
- _cm_fbchk_in_suspend(cm);
-
- if (cm->status_save_ext_pwr_inserted != is_ext_pwr_online(cm) ||
- cm->status_save_batt != is_batt_present(cm)) {
- ret = false;
- break;
- }
- }
- mutex_unlock(&cm_list_mtx);
-
- cm_rtc_set = cm_setup_timer();
-out:
- /* It's about the time when the non-CM appointed timer goes off */
- if (rtc_wkalarm_save.enabled) {
- unsigned long now;
- struct rtc_time tmp;
-
- rtc_read_time(rtc_dev, &tmp);
- rtc_tm_to_time(&tmp, &now);
-
- if (rtc_wkalarm_save_time &&
- now + CM_RTC_SMALL >= rtc_wkalarm_save_time)
- return false;
- }
- return ret;
-}
-EXPORT_SYMBOL_GPL(cm_suspend_again);
-
-/**
- * setup_charger_manager - initialize charger_global_desc data
- * @gd: pointer to instance of charger_global_desc
- */
-int setup_charger_manager(struct charger_global_desc *gd)
-{
- if (!gd)
- return -EINVAL;
-
- if (rtc_dev)
- rtc_class_close(rtc_dev);
- rtc_dev = NULL;
- g_desc = NULL;
-
- if (!gd->rtc_only_wakeup) {
- pr_err("The callback rtc_only_wakeup is not given\n");
- return -EINVAL;
- }
-
- if (gd->rtc_name) {
- rtc_dev = rtc_class_open(gd->rtc_name);
- if (IS_ERR_OR_NULL(rtc_dev)) {
- rtc_dev = NULL;
- /* Retry at probe. RTC may be not registered yet */
- }
- } else {
- pr_warn("No wakeup timer is given for charger manager. "
- "In-suspend monitoring won't work.\n");
- }
-
- g_desc = gd;
- return 0;
-}
-EXPORT_SYMBOL_GPL(setup_charger_manager);
-
/**
* charger_extcon_work - enable/diable charger according to the state
* of charger cable
@@ -1719,6 +1589,12 @@ static inline struct charger_desc *cm_get_drv_data(struct platform_device *pdev)
return dev_get_platdata(&pdev->dev);
}
+static enum alarmtimer_restart cm_timer_func(struct alarm *alarm, ktime_t now)
+{
+ cm_timer_set = false;
+ return ALARMTIMER_NORESTART;
+}
+
static int charger_manager_probe(struct platform_device *pdev)
{
struct charger_desc *desc = cm_get_drv_data(pdev);
@@ -1728,16 +1604,6 @@ static int charger_manager_probe(struct platform_device *pdev)
union power_supply_propval val;
struct power_supply *fuel_gauge;
- if (g_desc && !rtc_dev && g_desc->rtc_name) {
- rtc_dev = rtc_class_open(g_desc->rtc_name);
- if (IS_ERR_OR_NULL(rtc_dev)) {
- rtc_dev = NULL;
- dev_err(&pdev->dev, "Cannot get RTC %s\n",
- g_desc->rtc_name);
- return -ENODEV;
- }
- }
-
if (IS_ERR(desc)) {
dev_err(&pdev->dev, "No platform data (desc) found\n");
return -ENODEV;
@@ -1752,6 +1618,12 @@ static int charger_manager_probe(struct platform_device *pdev)
cm->dev = &pdev->dev;
cm->desc = desc;
+ /* Initialize alarm timer */
+ if (alarmtimer_get_rtcdev()) {
+ cm_timer = devm_kzalloc(cm->dev, sizeof(*cm_timer), GFP_KERNEL);
+ alarm_init(cm_timer, ALARM_BOOTTIME, cm_timer_func);
+ }
+
/*
* The following two do not need to be errors.
* Users may intentionally ignore those two features.
@@ -1993,38 +1865,41 @@ static int cm_suspend_noirq(struct device *dev)
return ret;
}
+static bool cm_need_to_awake(void)
+{
+ struct charger_manager *cm;
+
+ if (cm_timer)
+ return false;
+
+ mutex_lock(&cm_list_mtx);
+ list_for_each_entry(cm, &cm_list, entry) {
+ if (is_charging(cm)) {
+ mutex_unlock(&cm_list_mtx);
+ return true;
+ }
+ }
+ mutex_unlock(&cm_list_mtx);
+
+ return false;
+}
+
static int cm_suspend_prepare(struct device *dev)
{
struct charger_manager *cm = dev_get_drvdata(dev);
- if (!cm_suspended) {
- if (rtc_dev) {
- struct rtc_time tmp;
- unsigned long now;
-
- rtc_read_alarm(rtc_dev, &rtc_wkalarm_save);
- rtc_read_time(rtc_dev, &tmp);
+ if (cm_need_to_awake())
+ return -EBUSY;
- if (rtc_wkalarm_save.enabled) {
- rtc_tm_to_time(&rtc_wkalarm_save.time,
- &rtc_wkalarm_save_time);
- rtc_tm_to_time(&tmp, &now);
- if (now > rtc_wkalarm_save_time)
- rtc_wkalarm_save_time = 0;
- } else {
- rtc_wkalarm_save_time = 0;
- }
- }
+ if (!cm_suspended)
cm_suspended = true;
- }
- cancel_delayed_work(&cm->fullbatt_vchk_work);
- cm->status_save_ext_pwr_inserted = is_ext_pwr_online(cm);
- cm->status_save_batt = is_batt_present(cm);
+ cm_timer_set = cm_setup_timer();
- if (!cm_rtc_set) {
- cm_suspend_duration_ms = 0;
- cm_rtc_set = cm_setup_timer();
+ if (cm_timer_set) {
+ cancel_work_sync(&setup_polling);
+ cancel_delayed_work_sync(&cm_monitor_work);
+ cancel_delayed_work(&cm->fullbatt_vchk_work);
}
return 0;
@@ -2034,18 +1909,21 @@ static void cm_suspend_complete(struct device *dev)
{
struct charger_manager *cm = dev_get_drvdata(dev);
- if (cm_suspended) {
- if (rtc_dev) {
- struct rtc_wkalrm tmp;
-
- rtc_read_alarm(rtc_dev, &tmp);
- rtc_wkalarm_save.pending = tmp.pending;
- rtc_set_alarm(rtc_dev, &rtc_wkalarm_save);
- }
+ if (cm_suspended)
cm_suspended = false;
- cm_rtc_set = false;
+
+ if (cm_timer_set) {
+ ktime_t remain;
+
+ alarm_cancel(cm_timer);
+ cm_timer_set = false;
+ remain = alarm_expires_remaining(cm_timer);
+ cm_suspend_duration_ms -= ktime_to_ms(remain);
+ schedule_work(&setup_polling);
}
+ _cm_monitor(cm);
+
/* Re-enqueue delayed work (fullbatt_vchk_work) */
if (cm->fullbatt_vchk_jiffies_at) {
unsigned long delay = 0;
@@ -2060,21 +1938,18 @@ static void cm_suspend_complete(struct device *dev)
}
/*
- * Account for cm_suspend_duration_ms if
- * assume_timer_stops_in_suspend is active
+ * Account for cm_suspend_duration_ms with assuming that
+ * timer stops in suspend.
*/
- if (g_desc && g_desc->assume_timer_stops_in_suspend) {
- if (delay > cm_suspend_duration_ms)
- delay -= cm_suspend_duration_ms;
- else
- delay = 0;
- }
+ if (delay > cm_suspend_duration_ms)
+ delay -= cm_suspend_duration_ms;
+ else
+ delay = 0;
queue_delayed_work(cm_wq, &cm->fullbatt_vchk_work,
msecs_to_jiffies(delay));
}
device_set_wakeup_capable(cm->dev, false);
- uevent_notify(cm, NULL);
}
static const struct dev_pm_ops charger_manager_pm = {
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-22 14:23:56 +0300