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charger-manager.c
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/*
* Copyright (C) 2011 Samsung Electronics Co., Ltd.
* MyungJoo Ham <[email protected]>
*
* This driver enables to monitor battery health and control charger
* during suspend-to-mem.
* Charger manager depends on other devices. register this later than
* the depending devices.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
**/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/io.h>
#include <linux/module.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/rtc.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/platform_device.h>
#include <linux/power/charger-manager.h>
#include <linux/regulator/consumer.h>
#include <linux/sysfs.h>
#include <linux/of.h>
#include <linux/thermal.h>
/*
* Default termperature threshold for charging.
* Every temperature units are in tenth of centigrade.
*/
#define CM_DEFAULT_RECHARGE_TEMP_DIFF 50
#define CM_DEFAULT_CHARGE_TEMP_MAX 500
static const char * const default_event_names[] = {
[CM_EVENT_UNKNOWN] = "Unknown",
[CM_EVENT_BATT_FULL] = "Battery Full",
[CM_EVENT_BATT_IN] = "Battery Inserted",
[CM_EVENT_BATT_OUT] = "Battery Pulled Out",
[CM_EVENT_BATT_OVERHEAT] = "Battery Overheat",
[CM_EVENT_BATT_COLD] = "Battery Cold",
[CM_EVENT_EXT_PWR_IN_OUT] = "External Power Attach/Detach",
[CM_EVENT_CHG_START_STOP] = "Charging Start/Stop",
[CM_EVENT_OTHERS] = "Other battery events"
};
/*
* Regard CM_JIFFIES_SMALL jiffies is small enough to ignore for
* delayed works so that we can run delayed works with CM_JIFFIES_SMALL
* without any delays.
*/
#define CM_JIFFIES_SMALL (2)
/* If y is valid (> 0) and smaller than x, do x = y */
#define CM_MIN_VALID(x, y) x = (((y > 0) && ((x) > (y))) ? (y) : (x))
/*
* Regard CM_RTC_SMALL (sec) is small enough to ignore error in invoking
* rtc alarm. It should be 2 or larger
*/
#define CM_RTC_SMALL (2)
#define UEVENT_BUF_SIZE 32
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 bool cm_suspended;
static bool cm_rtc_set;
static unsigned long cm_suspend_duration_ms;
/* About normal (not suspended) monitoring */
static unsigned long polling_jiffy = ULONG_MAX; /* ULONG_MAX: no polling */
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.
*/
static bool is_batt_present(struct charger_manager *cm)
{
union power_supply_propval val;
struct power_supply *psy;
bool present = false;
int i, ret;
switch (cm->desc->battery_present) {
case CM_BATTERY_PRESENT:
present = true;
break;
case CM_NO_BATTERY:
break;
case CM_FUEL_GAUGE:
psy = power_supply_get_by_name(cm->desc->psy_fuel_gauge);
if (!psy)
break;
ret = psy->get_property(psy,
POWER_SUPPLY_PROP_PRESENT, &val);
if (ret == 0 && val.intval)
present = true;
break;
case CM_CHARGER_STAT:
for (i = 0; cm->desc->psy_charger_stat[i]; i++) {
psy = power_supply_get_by_name(
cm->desc->psy_charger_stat[i]);
if (!psy) {
dev_err(cm->dev, "Cannot find power supply \"%s\"\n",
cm->desc->psy_charger_stat[i]);
continue;
}
ret = psy->get_property(psy, POWER_SUPPLY_PROP_PRESENT,
&val);
if (ret == 0 && val.intval) {
present = true;
break;
}
}
break;
}
return present;
}
/**
* is_ext_pwr_online - See if an external power source is attached to charge
* @cm: the Charger Manager representing the battery.
*
* Returns true if at least one of the chargers of the battery has an external
* power source attached to charge the battery regardless of whether it is
* actually charging or not.
*/
static bool is_ext_pwr_online(struct charger_manager *cm)
{
union power_supply_propval val;
struct power_supply *psy;
bool online = false;
int i, ret;
/* If at least one of them has one, it's yes. */
for (i = 0; cm->desc->psy_charger_stat[i]; i++) {
psy = power_supply_get_by_name(cm->desc->psy_charger_stat[i]);
if (!psy) {
dev_err(cm->dev, "Cannot find power supply \"%s\"\n",
cm->desc->psy_charger_stat[i]);
continue;
}
ret = psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &val);
if (ret == 0 && val.intval) {
online = true;
break;
}
}
return online;
}
/**
* get_batt_uV - Get the voltage level of the battery
* @cm: the Charger Manager representing the battery.
* @uV: the voltage level returned.
*
* Returns 0 if there is no error.
* Returns a negative value on error.
*/
static int get_batt_uV(struct charger_manager *cm, int *uV)
{
union power_supply_propval val;
struct power_supply *fuel_gauge;
int ret;
fuel_gauge = power_supply_get_by_name(cm->desc->psy_fuel_gauge);
if (!fuel_gauge)
return -ENODEV;
ret = fuel_gauge->get_property(fuel_gauge,
POWER_SUPPLY_PROP_VOLTAGE_NOW, &val);
if (ret)
return ret;
*uV = val.intval;
return 0;
}
/**
* is_charging - Returns true if the battery is being charged.
* @cm: the Charger Manager representing the battery.
*/
static bool is_charging(struct charger_manager *cm)
{
int i, ret;
bool charging = false;
struct power_supply *psy;
union power_supply_propval val;
/* If there is no battery, it cannot be charged */
if (!is_batt_present(cm))
return false;
/* If at least one of the charger is charging, return yes */
for (i = 0; cm->desc->psy_charger_stat[i]; i++) {
/* 1. The charger sholuld not be DISABLED */
if (cm->emergency_stop)
continue;
if (!cm->charger_enabled)
continue;
psy = power_supply_get_by_name(cm->desc->psy_charger_stat[i]);
if (!psy) {
dev_err(cm->dev, "Cannot find power supply \"%s\"\n",
cm->desc->psy_charger_stat[i]);
continue;
}
/* 2. The charger should be online (ext-power) */
ret = psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &val);
if (ret) {
dev_warn(cm->dev, "Cannot read ONLINE value from %s\n",
cm->desc->psy_charger_stat[i]);
continue;
}
if (val.intval == 0)
continue;
/*
* 3. The charger should not be FULL, DISCHARGING,
* or NOT_CHARGING.
*/
ret = psy->get_property(psy, POWER_SUPPLY_PROP_STATUS, &val);
if (ret) {
dev_warn(cm->dev, "Cannot read STATUS value from %s\n",
cm->desc->psy_charger_stat[i]);
continue;
}
if (val.intval == POWER_SUPPLY_STATUS_FULL ||
val.intval == POWER_SUPPLY_STATUS_DISCHARGING ||
val.intval == POWER_SUPPLY_STATUS_NOT_CHARGING)
continue;
/* Then, this is charging. */
charging = true;
break;
}
return charging;
}
/**
* is_full_charged - Returns true if the battery is fully charged.
* @cm: the Charger Manager representing the battery.
*/
static bool is_full_charged(struct charger_manager *cm)
{
struct charger_desc *desc = cm->desc;
union power_supply_propval val;
struct power_supply *fuel_gauge;
int ret = 0;
int uV;
/* If there is no battery, it cannot be charged */
if (!is_batt_present(cm))
return false;
fuel_gauge = power_supply_get_by_name(cm->desc->psy_fuel_gauge);
if (!fuel_gauge)
return false;
if (desc->fullbatt_full_capacity > 0) {
val.intval = 0;
/* Not full if capacity of fuel gauge isn't full */
ret = fuel_gauge->get_property(fuel_gauge,
POWER_SUPPLY_PROP_CHARGE_FULL, &val);
if (!ret && val.intval > desc->fullbatt_full_capacity)
return true;
}
/* Full, if it's over the fullbatt voltage */
if (desc->fullbatt_uV > 0) {
ret = get_batt_uV(cm, &uV);
if (!ret && uV >= desc->fullbatt_uV)
return true;
}
/* Full, if the capacity is more than fullbatt_soc */
if (desc->fullbatt_soc > 0) {
val.intval = 0;
ret = fuel_gauge->get_property(fuel_gauge,
POWER_SUPPLY_PROP_CAPACITY, &val);
if (!ret && val.intval >= desc->fullbatt_soc)
return true;
}
return false;
}
/**
* is_polling_required - Return true if need to continue polling for this CM.
* @cm: the Charger Manager representing the battery.
*/
static bool is_polling_required(struct charger_manager *cm)
{
switch (cm->desc->polling_mode) {
case CM_POLL_DISABLE:
return false;
case CM_POLL_ALWAYS:
return true;
case CM_POLL_EXTERNAL_POWER_ONLY:
return is_ext_pwr_online(cm);
case CM_POLL_CHARGING_ONLY:
return is_charging(cm);
default:
dev_warn(cm->dev, "Incorrect polling_mode (%d)\n",
cm->desc->polling_mode);
}
return false;
}
/**
* try_charger_enable - Enable/Disable chargers altogether
* @cm: the Charger Manager representing the battery.
* @enable: true: enable / false: disable
*
* Note that Charger Manager keeps the charger enabled regardless whether
* the charger is charging or not (because battery is full or no external
* power source exists) except when CM needs to disable chargers forcibly
* bacause of emergency causes; when the battery is overheated or too cold.
*/
static int try_charger_enable(struct charger_manager *cm, bool enable)
{
int err = 0, i;
struct charger_desc *desc = cm->desc;
/* Ignore if it's redundent command */
if (enable == cm->charger_enabled)
return 0;
if (enable) {
if (cm->emergency_stop)
return -EAGAIN;
/*
* Save start time of charging to limit
* maximum possible charging time.
*/
cm->charging_start_time = ktime_to_ms(ktime_get());
cm->charging_end_time = 0;
for (i = 0 ; i < desc->num_charger_regulators ; i++) {
if (desc->charger_regulators[i].externally_control)
continue;
err = regulator_enable(desc->charger_regulators[i].consumer);
if (err < 0) {
dev_warn(cm->dev, "Cannot enable %s regulator\n",
desc->charger_regulators[i].regulator_name);
}
}
} else {
/*
* Save end time of charging to maintain fully charged state
* of battery after full-batt.
*/
cm->charging_start_time = 0;
cm->charging_end_time = ktime_to_ms(ktime_get());
for (i = 0 ; i < desc->num_charger_regulators ; i++) {
if (desc->charger_regulators[i].externally_control)
continue;
err = regulator_disable(desc->charger_regulators[i].consumer);
if (err < 0) {
dev_warn(cm->dev, "Cannot disable %s regulator\n",
desc->charger_regulators[i].regulator_name);
}
}
/*
* Abnormal battery state - Stop charging forcibly,
* even if charger was enabled at the other places
*/
for (i = 0; i < desc->num_charger_regulators; i++) {
if (regulator_is_enabled(
desc->charger_regulators[i].consumer)) {
regulator_force_disable(
desc->charger_regulators[i].consumer);
dev_warn(cm->dev, "Disable regulator(%s) forcibly\n",
desc->charger_regulators[i].regulator_name);
}
}
}
if (!err)
cm->charger_enabled = enable;
return err;
}
/**
* try_charger_restart - Restart charging.
* @cm: the Charger Manager representing the battery.
*
* Restart charging by turning off and on the charger.
*/
static int try_charger_restart(struct charger_manager *cm)
{
int err;
if (cm->emergency_stop)
return -EAGAIN;
err = try_charger_enable(cm, false);
if (err)
return err;
return try_charger_enable(cm, true);
}
/**
* uevent_notify - Let users know something has changed.
* @cm: the Charger Manager representing the battery.
* @event: the event string.
*
* If @event is null, it implies that uevent_notify is called
* by resume function. When called in the resume function, cm_suspended
* should be already reset to false in order to let uevent_notify
* notify the recent event during the suspend to users. While
* suspended, uevent_notify does not notify users, but tracks
* events so that uevent_notify can notify users later after resumed.
*/
static void uevent_notify(struct charger_manager *cm, const char *event)
{
static char env_str[UEVENT_BUF_SIZE + 1] = "";
static char env_str_save[UEVENT_BUF_SIZE + 1] = "";
if (cm_suspended) {
/* Nothing in suspended-event buffer */
if (env_str_save[0] == 0) {
if (!strncmp(env_str, event, UEVENT_BUF_SIZE))
return; /* status not changed */
strncpy(env_str_save, event, UEVENT_BUF_SIZE);
return;
}
if (!strncmp(env_str_save, event, UEVENT_BUF_SIZE))
return; /* Duplicated. */
strncpy(env_str_save, event, UEVENT_BUF_SIZE);
return;
}
if (event == NULL) {
/* No messages pending */
if (!env_str_save[0])
return;
strncpy(env_str, env_str_save, UEVENT_BUF_SIZE);
kobject_uevent(&cm->dev->kobj, KOBJ_CHANGE);
env_str_save[0] = 0;
return;
}
/* status not changed */
if (!strncmp(env_str, event, UEVENT_BUF_SIZE))
return;
/* save the status and notify the update */
strncpy(env_str, event, UEVENT_BUF_SIZE);
kobject_uevent(&cm->dev->kobj, KOBJ_CHANGE);
dev_info(cm->dev, "%s\n", event);
}
/**
* fullbatt_vchk - Check voltage drop some times after "FULL" event.
* @work: the work_struct appointing the function
*
* If a user has designated "fullbatt_vchkdrop_ms/uV" values with
* charger_desc, Charger Manager checks voltage drop after the battery
* "FULL" event. It checks whether the voltage has dropped more than
* fullbatt_vchkdrop_uV by calling this function after fullbatt_vchkrop_ms.
*/
static void fullbatt_vchk(struct work_struct *work)
{
struct delayed_work *dwork = to_delayed_work(work);
struct charger_manager *cm = container_of(dwork,
struct charger_manager, fullbatt_vchk_work);
struct charger_desc *desc = cm->desc;
int batt_uV, err, diff;
/* remove the appointment for fullbatt_vchk */
cm->fullbatt_vchk_jiffies_at = 0;
if (!desc->fullbatt_vchkdrop_uV || !desc->fullbatt_vchkdrop_ms)
return;
err = get_batt_uV(cm, &batt_uV);
if (err) {
dev_err(cm->dev, "%s: get_batt_uV error(%d)\n", __func__, err);
return;
}
diff = desc->fullbatt_uV - batt_uV;
if (diff < 0)
return;
dev_info(cm->dev, "VBATT dropped %duV after full-batt\n", diff);
if (diff > desc->fullbatt_vchkdrop_uV) {
try_charger_restart(cm);
uevent_notify(cm, "Recharging");
}
}
/**
* check_charging_duration - Monitor charging/discharging duration
* @cm: the Charger Manager representing the battery.
*
* If whole charging duration exceed 'charging_max_duration_ms',
* cm stop charging to prevent overcharge/overheat. If discharging
* duration exceed 'discharging _max_duration_ms', charger cable is
* attached, after full-batt, cm start charging to maintain fully
* charged state for battery.
*/
static int check_charging_duration(struct charger_manager *cm)
{
struct charger_desc *desc = cm->desc;
u64 curr = ktime_to_ms(ktime_get());
u64 duration;
int ret = false;
if (!desc->charging_max_duration_ms &&
!desc->discharging_max_duration_ms)
return ret;
if (cm->charger_enabled) {
duration = curr - cm->charging_start_time;
if (duration > desc->charging_max_duration_ms) {
dev_info(cm->dev, "Charging duration exceed %ums\n",
desc->charging_max_duration_ms);
uevent_notify(cm, "Discharging");
try_charger_enable(cm, false);
ret = true;
}
} else if (is_ext_pwr_online(cm) && !cm->charger_enabled) {
duration = curr - cm->charging_end_time;
if (duration > desc->charging_max_duration_ms &&
is_ext_pwr_online(cm)) {
dev_info(cm->dev, "Discharging duration exceed %ums\n",
desc->discharging_max_duration_ms);
uevent_notify(cm, "Recharging");
try_charger_enable(cm, true);
ret = true;
}
}
return ret;
}
static int cm_get_battery_temperature_by_psy(struct charger_manager *cm,
int *temp)
{
struct power_supply *fuel_gauge;
fuel_gauge = power_supply_get_by_name(cm->desc->psy_fuel_gauge);
if (!fuel_gauge)
return -ENODEV;
return fuel_gauge->get_property(fuel_gauge,
POWER_SUPPLY_PROP_TEMP,
(union power_supply_propval *)temp);
}
static int cm_get_battery_temperature(struct charger_manager *cm,
int *temp)
{
int ret;
if (!cm->desc->measure_battery_temp)
return -ENODEV;
#ifdef CONFIG_THERMAL
if (cm->tzd_batt) {
ret = thermal_zone_get_temp(cm->tzd_batt, (unsigned long *)temp);
if (!ret)
/* Calibrate temperature unit */
*temp /= 100;
} else
#endif
{
/* if-else continued from CONFIG_THERMAL */
ret = cm_get_battery_temperature_by_psy(cm, temp);
}
return ret;
}
static int cm_check_thermal_status(struct charger_manager *cm)
{
struct charger_desc *desc = cm->desc;
int temp, upper_limit, lower_limit;
int ret = 0;
ret = cm_get_battery_temperature(cm, &temp);
if (ret) {
/* FIXME:
* No information of battery temperature might
* occur hazadous result. We have to handle it
* depending on battery type.
*/
dev_err(cm->dev, "Failed to get battery temperature\n");
return 0;
}
upper_limit = desc->temp_max;
lower_limit = desc->temp_min;
if (cm->emergency_stop) {
upper_limit -= desc->temp_diff;
lower_limit += desc->temp_diff;
}
if (temp > upper_limit)
ret = CM_EVENT_BATT_OVERHEAT;
else if (temp < lower_limit)
ret = CM_EVENT_BATT_COLD;
return ret;
}
/**
* _cm_monitor - Monitor the temperature and return true for exceptions.
* @cm: the Charger Manager representing the battery.
*
* Returns true if there is an event to notify for the battery.
* (True if the status of "emergency_stop" changes)
*/
static bool _cm_monitor(struct charger_manager *cm)
{
int temp_alrt;
temp_alrt = cm_check_thermal_status(cm);
/* It has been stopped already */
if (temp_alrt && cm->emergency_stop)
return false;
/*
* Check temperature whether overheat or cold.
* If temperature is out of range normal state, stop charging.
*/
if (temp_alrt) {
cm->emergency_stop = temp_alrt;
if (!try_charger_enable(cm, false))
uevent_notify(cm, default_event_names[temp_alrt]);
/*
* Check whole charging duration and discharing duration
* after full-batt.
*/
} else if (!cm->emergency_stop && check_charging_duration(cm)) {
dev_dbg(cm->dev,
"Charging/Discharging duration is out of range\n");
/*
* Check dropped voltage of battery. If battery voltage is more
* dropped than fullbatt_vchkdrop_uV after fully charged state,
* charger-manager have to recharge battery.
*/
} else if (!cm->emergency_stop && is_ext_pwr_online(cm) &&
!cm->charger_enabled) {
fullbatt_vchk(&cm->fullbatt_vchk_work.work);
/*
* Check whether fully charged state to protect overcharge
* if charger-manager is charging for battery.
*/
} else if (!cm->emergency_stop && is_full_charged(cm) &&
cm->charger_enabled) {
dev_info(cm->dev, "EVENT_HANDLE: Battery Fully Charged\n");
uevent_notify(cm, default_event_names[CM_EVENT_BATT_FULL]);
try_charger_enable(cm, false);
fullbatt_vchk(&cm->fullbatt_vchk_work.work);
} else {
cm->emergency_stop = 0;
if (is_ext_pwr_online(cm)) {
if (!try_charger_enable(cm, true))
uevent_notify(cm, "CHARGING");
}
}
return true;
}
/**
* cm_monitor - Monitor every battery.
*
* Returns true if there is an event to notify from any of the batteries.
* (True if the status of "emergency_stop" changes)
*/
static bool cm_monitor(void)
{
bool stop = false;
struct charger_manager *cm;
mutex_lock(&cm_list_mtx);
list_for_each_entry(cm, &cm_list, entry) {
if (_cm_monitor(cm))
stop = true;
}
mutex_unlock(&cm_list_mtx);
return stop;
}
/**
* _setup_polling - Setup the next instance of polling.
* @work: work_struct of the function _setup_polling.
*/
static void _setup_polling(struct work_struct *work)
{
unsigned long min = ULONG_MAX;
struct charger_manager *cm;
bool keep_polling = false;
unsigned long _next_polling;
mutex_lock(&cm_list_mtx);
list_for_each_entry(cm, &cm_list, entry) {
if (is_polling_required(cm) && cm->desc->polling_interval_ms) {
keep_polling = true;
if (min > cm->desc->polling_interval_ms)
min = cm->desc->polling_interval_ms;
}
}
polling_jiffy = msecs_to_jiffies(min);
if (polling_jiffy <= CM_JIFFIES_SMALL)
polling_jiffy = CM_JIFFIES_SMALL + 1;
if (!keep_polling)
polling_jiffy = ULONG_MAX;
if (polling_jiffy == ULONG_MAX)
goto out;
WARN(cm_wq == NULL, "charger-manager: workqueue not initialized"
". try it later. %s\n", __func__);
/*
* Use mod_delayed_work() iff the next polling interval should
* occur before the currently scheduled one. If @cm_monitor_work
* isn't active, the end result is the same, so no need to worry
* about stale @next_polling.
*/
_next_polling = jiffies + polling_jiffy;
if (time_before(_next_polling, next_polling)) {
mod_delayed_work(cm_wq, &cm_monitor_work, polling_jiffy);
next_polling = _next_polling;
} else {
if (queue_delayed_work(cm_wq, &cm_monitor_work, polling_jiffy))
next_polling = _next_polling;
}
out:
mutex_unlock(&cm_list_mtx);
}
static DECLARE_WORK(setup_polling, _setup_polling);
/**
* cm_monitor_poller - The Monitor / Poller.
* @work: work_struct of the function cm_monitor_poller
*
* During non-suspended state, cm_monitor_poller is used to poll and monitor
* the batteries.
*/
static void cm_monitor_poller(struct work_struct *work)
{
cm_monitor();
schedule_work(&setup_polling);
}
/**
* fullbatt_handler - Event handler for CM_EVENT_BATT_FULL
* @cm: the Charger Manager representing the battery.
*/
static void fullbatt_handler(struct charger_manager *cm)
{
struct charger_desc *desc = cm->desc;
if (!desc->fullbatt_vchkdrop_uV || !desc->fullbatt_vchkdrop_ms)
goto out;
if (cm_suspended)
device_set_wakeup_capable(cm->dev, true);
mod_delayed_work(cm_wq, &cm->fullbatt_vchk_work,
msecs_to_jiffies(desc->fullbatt_vchkdrop_ms));
cm->fullbatt_vchk_jiffies_at = jiffies + msecs_to_jiffies(
desc->fullbatt_vchkdrop_ms);
if (cm->fullbatt_vchk_jiffies_at == 0)
cm->fullbatt_vchk_jiffies_at = 1;
out:
dev_info(cm->dev, "EVENT_HANDLE: Battery Fully Charged\n");
uevent_notify(cm, default_event_names[CM_EVENT_BATT_FULL]);
}
/**
* battout_handler - Event handler for CM_EVENT_BATT_OUT
* @cm: the Charger Manager representing the battery.
*/
static void battout_handler(struct charger_manager *cm)
{
if (cm_suspended)
device_set_wakeup_capable(cm->dev, true);
if (!is_batt_present(cm)) {
dev_emerg(cm->dev, "Battery Pulled Out!\n");
uevent_notify(cm, default_event_names[CM_EVENT_BATT_OUT]);
} else {
uevent_notify(cm, "Battery Reinserted?");
}
}
/**
* misc_event_handler - Handler for other evnets
* @cm: the Charger Manager representing the battery.
* @type: the Charger Manager representing the battery.
*/
static void misc_event_handler(struct charger_manager *cm,
enum cm_event_types type)
{
if (cm_suspended)
device_set_wakeup_capable(cm->dev, true);
if (is_polling_required(cm) && cm->desc->polling_interval_ms)
schedule_work(&setup_polling);
uevent_notify(cm, default_event_names[type]);
}
static int charger_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct charger_manager *cm = container_of(psy,
struct charger_manager, charger_psy);
struct charger_desc *desc = cm->desc;
struct power_supply *fuel_gauge;
int ret = 0;
int uV;
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
if (is_charging(cm))
val->intval = POWER_SUPPLY_STATUS_CHARGING;
else if (is_ext_pwr_online(cm))
val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
else
val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
break;
case POWER_SUPPLY_PROP_HEALTH:
if (cm->emergency_stop > 0)
val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
else if (cm->emergency_stop < 0)
val->intval = POWER_SUPPLY_HEALTH_COLD;
else
val->intval = POWER_SUPPLY_HEALTH_GOOD;
break;
case POWER_SUPPLY_PROP_PRESENT:
if (is_batt_present(cm))
val->intval = 1;
else
val->intval = 0;
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
ret = get_batt_uV(cm, &val->intval);
break;
case POWER_SUPPLY_PROP_CURRENT_NOW:
fuel_gauge = power_supply_get_by_name(cm->desc->psy_fuel_gauge);
if (!fuel_gauge) {
ret = -ENODEV;
break;
}
ret = fuel_gauge->get_property(fuel_gauge,
POWER_SUPPLY_PROP_CURRENT_NOW, val);
break;
case POWER_SUPPLY_PROP_TEMP:
case POWER_SUPPLY_PROP_TEMP_AMBIENT:
return cm_get_battery_temperature(cm, &val->intval);
case POWER_SUPPLY_PROP_CAPACITY:
fuel_gauge = power_supply_get_by_name(cm->desc->psy_fuel_gauge);
if (!fuel_gauge) {
ret = -ENODEV;
break;
}
if (!is_batt_present(cm)) {
/* There is no battery. Assume 100% */
val->intval = 100;
break;
}
ret = fuel_gauge->get_property(fuel_gauge,
POWER_SUPPLY_PROP_CAPACITY, val);
if (ret)
break;
if (val->intval > 100) {
val->intval = 100;
break;
}
if (val->intval < 0)
val->intval = 0;
/* Do not adjust SOC when charging: voltage is overrated */
if (is_charging(cm))
break;
/*
* If the capacity value is inconsistent, calibrate it base on
* the battery voltage values and the thresholds given as desc
*/
ret = get_batt_uV(cm, &uV);
if (ret) {
/* Voltage information not available. No calibration */
ret = 0;
break;
}
if (desc->fullbatt_uV > 0 && uV >= desc->fullbatt_uV &&
!is_charging(cm)) {
val->intval = 100;
break;
}
break;
case POWER_SUPPLY_PROP_ONLINE:
if (is_ext_pwr_online(cm))
val->intval = 1;
else
val->intval = 0;
break;
case POWER_SUPPLY_PROP_CHARGE_FULL:
if (is_full_charged(cm))
val->intval = 1;
else
val->intval = 0;
ret = 0;
break;
case POWER_SUPPLY_PROP_CHARGE_NOW:
if (is_charging(cm)) {
fuel_gauge = power_supply_get_by_name(
cm->desc->psy_fuel_gauge);
if (!fuel_gauge) {
ret = -ENODEV;
break;
}
ret = fuel_gauge->get_property(fuel_gauge,
POWER_SUPPLY_PROP_CHARGE_NOW,
val);
if (ret) {
val->intval = 1;
ret = 0;
} else {
/* If CHARGE_NOW is supplied, use it */
val->intval = (val->intval > 0) ?
val->intval : 1;
}
} else {
val->intval = 0;
}