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linux-next/drivers/power/charger-manager.c
Jonghwa Lee c1155c64e6 power: charger-manager: Use alarmtimer for battery monitoring in suspend.
To guerantee proper charing and managing batteries even in suspend,
charger-manager has used rtc device with rtc framework interface.
However, it is better to use alarmtimer for cleaner and more appropriate
operation.
This patch makes driver to use alarmtimer for polling work in suspend and
removes all deprecated codes related with using rtc interface.

Signed-off-by: Jonghwa Lee <jonghwa3.lee@samsung.com>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
2015-01-21 20:52:07 +01:00

2062 lines
54 KiB
C

/*
* Copyright (C) 2011 Samsung Electronics Co., Ltd.
* MyungJoo Ham <myungjoo.ham@samsung.com>
*
* 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 alarm *cm_timer;
static bool cm_suspended;
static bool cm_timer_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 */
/**
* 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;
}
break;
default:
return -EINVAL;
}
return ret;
}
#define NUM_CHARGER_PSY_OPTIONAL (4)
static enum power_supply_property default_charger_props[] = {
/* Guaranteed to provide */
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_HEALTH,
POWER_SUPPLY_PROP_PRESENT,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_CAPACITY,
POWER_SUPPLY_PROP_ONLINE,
POWER_SUPPLY_PROP_CHARGE_FULL,
/*
* Optional properties are:
* POWER_SUPPLY_PROP_CHARGE_NOW,
* POWER_SUPPLY_PROP_CURRENT_NOW,
* POWER_SUPPLY_PROP_TEMP, and
* POWER_SUPPLY_PROP_TEMP_AMBIENT,
*/
};
static struct power_supply psy_default = {
.name = "battery",
.type = POWER_SUPPLY_TYPE_BATTERY,
.properties = default_charger_props,
.num_properties = ARRAY_SIZE(default_charger_props),
.get_property = charger_get_property,
.no_thermal = true,
};
/**
* cm_setup_timer - For in-suspend monitoring setup wakeup alarm
* for suspend_again.
*
* Returns true if the alarm is set for Charger Manager to use.
* Returns false if
* cm_setup_timer fails to set an alarm,
* cm_setup_timer does not need to set an alarm for Charger Manager,
* or an alarm previously configured is to be used.
*/
static bool cm_setup_timer(void)
{
struct charger_manager *cm;
unsigned int wakeup_ms = UINT_MAX;
int timer_req = 0;
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;
/* fullbatt_vchk is required. setup timer for that */
if (cm->fullbatt_vchk_jiffies_at) {
fbchk_ms = jiffies_to_msecs(cm->fullbatt_vchk_jiffies_at
- jiffies);
if (time_is_before_eq_jiffies(
cm->fullbatt_vchk_jiffies_at) ||
msecs_to_jiffies(fbchk_ms) < CM_JIFFIES_SMALL) {
fullbatt_vchk(&cm->fullbatt_vchk_work.work);
fbchk_ms = 0;
}
}
CM_MIN_VALID(wakeup_ms, fbchk_ms);
/* 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 (timer_req && cm_timer) {
ktime_t now, add;
/*
* 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;
pr_info("Charger Manager wakeup timer: %u ms\n", wakeup_ms);
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));
cm_suspend_duration_ms = wakeup_ms;
return true;
}
return false;
}
/**
* charger_extcon_work - enable/diable charger according to the state
* of charger cable
*
* @work: work_struct of the function charger_extcon_work.
*/
static void charger_extcon_work(struct work_struct *work)
{
struct charger_cable *cable =
container_of(work, struct charger_cable, wq);
int ret;
if (cable->attached && cable->min_uA != 0 && cable->max_uA != 0) {
ret = regulator_set_current_limit(cable->charger->consumer,
cable->min_uA, cable->max_uA);
if (ret < 0) {
pr_err("Cannot set current limit of %s (%s)\n",
cable->charger->regulator_name, cable->name);
return;
}
pr_info("Set current limit of %s : %duA ~ %duA\n",
cable->charger->regulator_name,
cable->min_uA, cable->max_uA);
}
try_charger_enable(cable->cm, cable->attached);
}
/**
* charger_extcon_notifier - receive the state of charger cable
* when registered cable is attached or detached.
*
* @self: the notifier block of the charger_extcon_notifier.
* @event: the cable state.
* @ptr: the data pointer of notifier block.
*/
static int charger_extcon_notifier(struct notifier_block *self,
unsigned long event, void *ptr)
{
struct charger_cable *cable =
container_of(self, struct charger_cable, nb);
/*
* The newly state of charger cable.
* If cable is attached, cable->attached is true.
*/
cable->attached = event;
/*
* Setup monitoring to check battery state
* when charger cable is attached.
*/
if (cable->attached && is_polling_required(cable->cm)) {
cancel_work_sync(&setup_polling);
schedule_work(&setup_polling);
}
/*
* Setup work for controlling charger(regulator)
* according to charger cable.
*/
schedule_work(&cable->wq);
return NOTIFY_DONE;
}
/**
* charger_extcon_init - register external connector to use it
* as the charger cable
*
* @cm: the Charger Manager representing the battery.
* @cable: the Charger cable representing the external connector.
*/
static int charger_extcon_init(struct charger_manager *cm,
struct charger_cable *cable)
{
int ret = 0;
/*
* Charger manager use Extcon framework to identify
* the charger cable among various external connector
* cable (e.g., TA, USB, MHL, Dock).
*/
INIT_WORK(&cable->wq, charger_extcon_work);
cable->nb.notifier_call = charger_extcon_notifier;
ret = extcon_register_interest(&cable->extcon_dev,
cable->extcon_name, cable->name, &cable->nb);
if (ret < 0) {
pr_info("Cannot register extcon_dev for %s(cable: %s)\n",
cable->extcon_name, cable->name);
ret = -EINVAL;
}
return ret;
}
/**
* charger_manager_register_extcon - Register extcon device to recevie state
* of charger cable.
* @cm: the Charger Manager representing the battery.
*
* This function support EXTCON(External Connector) subsystem to detect the
* state of charger cables for enabling or disabling charger(regulator) and
* select the charger cable for charging among a number of external cable
* according to policy of H/W board.
*/
static int charger_manager_register_extcon(struct charger_manager *cm)
{
struct charger_desc *desc = cm->desc;
struct charger_regulator *charger;
int ret = 0;
int i;
int j;
for (i = 0; i < desc->num_charger_regulators; i++) {
charger = &desc->charger_regulators[i];
charger->consumer = regulator_get(cm->dev,
charger->regulator_name);
if (IS_ERR(charger->consumer)) {
dev_err(cm->dev, "Cannot find charger(%s)\n",
charger->regulator_name);
return PTR_ERR(charger->consumer);
}
charger->cm = cm;
for (j = 0; j < charger->num_cables; j++) {
struct charger_cable *cable = &charger->cables[j];
ret = charger_extcon_init(cm, cable);
if (ret < 0) {
dev_err(cm->dev, "Cannot initialize charger(%s)\n",
charger->regulator_name);
goto err;
}
cable->charger = charger;
cable->cm = cm;
}
}
err:
return ret;
}
/* help function of sysfs node to control charger(regulator) */
static ssize_t charger_name_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct charger_regulator *charger
= container_of(attr, struct charger_regulator, attr_name);
return sprintf(buf, "%s\n", charger->regulator_name);
}
static ssize_t charger_state_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct charger_regulator *charger
= container_of(attr, struct charger_regulator, attr_state);
int state = 0;
if (!charger->externally_control)
state = regulator_is_enabled(charger->consumer);
return sprintf(buf, "%s\n", state ? "enabled" : "disabled");
}
static ssize_t charger_externally_control_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct charger_regulator *charger = container_of(attr,
struct charger_regulator, attr_externally_control);
return sprintf(buf, "%d\n", charger->externally_control);
}
static ssize_t charger_externally_control_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t count)
{
struct charger_regulator *charger
= container_of(attr, struct charger_regulator,
attr_externally_control);
struct charger_manager *cm = charger->cm;
struct charger_desc *desc = cm->desc;
int i;
int ret;
int externally_control;
int chargers_externally_control = 1;
ret = sscanf(buf, "%d", &externally_control);
if (ret == 0) {
ret = -EINVAL;
return ret;
}
if (!externally_control) {
charger->externally_control = 0;
return count;
}
for (i = 0; i < desc->num_charger_regulators; i++) {
if (&desc->charger_regulators[i] != charger &&
!desc->charger_regulators[i].externally_control) {
/*
* At least, one charger is controlled by
* charger-manager
*/
chargers_externally_control = 0;
break;
}
}
if (!chargers_externally_control) {
if (cm->charger_enabled) {
try_charger_enable(charger->cm, false);
charger->externally_control = externally_control;
try_charger_enable(charger->cm, true);
} else {
charger->externally_control = externally_control;
}
} else {
dev_warn(cm->dev,
"'%s' regulator should be controlled in charger-manager because charger-manager must need at least one charger for charging\n",
charger->regulator_name);
}
return count;
}
/**
* charger_manager_register_sysfs - Register sysfs entry for each charger
* @cm: the Charger Manager representing the battery.
*
* This function add sysfs entry for charger(regulator) to control charger from
* user-space. If some development board use one more chargers for charging
* but only need one charger on specific case which is dependent on user
* scenario or hardware restrictions, the user enter 1 or 0(zero) to '/sys/
* class/power_supply/battery/charger.[index]/externally_control'. For example,
* if user enter 1 to 'sys/class/power_supply/battery/charger.[index]/
* externally_control, this charger isn't controlled from charger-manager and
* always stay off state of regulator.
*/
static int charger_manager_register_sysfs(struct charger_manager *cm)
{
struct charger_desc *desc = cm->desc;
struct charger_regulator *charger;
int chargers_externally_control = 1;
char buf[11];
char *str;
int ret = 0;
int i;
/* Create sysfs entry to control charger(regulator) */
for (i = 0; i < desc->num_charger_regulators; i++) {
charger = &desc->charger_regulators[i];
snprintf(buf, 10, "charger.%d", i);
str = devm_kzalloc(cm->dev,
sizeof(char) * (strlen(buf) + 1), GFP_KERNEL);
if (!str) {
ret = -ENOMEM;
goto err;
}
strcpy(str, buf);
charger->attrs[0] = &charger->attr_name.attr;
charger->attrs[1] = &charger->attr_state.attr;
charger->attrs[2] = &charger->attr_externally_control.attr;
charger->attrs[3] = NULL;
charger->attr_g.name = str;
charger->attr_g.attrs = charger->attrs;
sysfs_attr_init(&charger->attr_name.attr);
charger->attr_name.attr.name = "name";
charger->attr_name.attr.mode = 0444;
charger->attr_name.show = charger_name_show;
sysfs_attr_init(&charger->attr_state.attr);
charger->attr_state.attr.name = "state";
charger->attr_state.attr.mode = 0444;
charger->attr_state.show = charger_state_show;
sysfs_attr_init(&charger->attr_externally_control.attr);
charger->attr_externally_control.attr.name
= "externally_control";
charger->attr_externally_control.attr.mode = 0644;
charger->attr_externally_control.show
= charger_externally_control_show;
charger->attr_externally_control.store
= charger_externally_control_store;
if (!desc->charger_regulators[i].externally_control ||
!chargers_externally_control)
chargers_externally_control = 0;
dev_info(cm->dev, "'%s' regulator's externally_control is %d\n",
charger->regulator_name, charger->externally_control);
ret = sysfs_create_group(&cm->charger_psy.dev->kobj,
&charger->attr_g);
if (ret < 0) {
dev_err(cm->dev, "Cannot create sysfs entry of %s regulator\n",
charger->regulator_name);
ret = -EINVAL;
goto err;
}
}
if (chargers_externally_control) {
dev_err(cm->dev, "Cannot register regulator because charger-manager must need at least one charger for charging battery\n");
ret = -EINVAL;
goto err;
}
err:
return ret;
}
static int cm_init_thermal_data(struct charger_manager *cm,
struct power_supply *fuel_gauge)
{
struct charger_desc *desc = cm->desc;
union power_supply_propval val;
int ret;
/* Verify whether fuel gauge provides battery temperature */
ret = fuel_gauge->get_property(fuel_gauge,
POWER_SUPPLY_PROP_TEMP, &val);
if (!ret) {
cm->charger_psy.properties[cm->charger_psy.num_properties] =
POWER_SUPPLY_PROP_TEMP;
cm->charger_psy.num_properties++;
cm->desc->measure_battery_temp = true;
}
#ifdef CONFIG_THERMAL
if (ret && desc->thermal_zone) {
cm->tzd_batt =
thermal_zone_get_zone_by_name(desc->thermal_zone);
if (IS_ERR(cm->tzd_batt))
return PTR_ERR(cm->tzd_batt);
/* Use external thermometer */
cm->charger_psy.properties[cm->charger_psy.num_properties] =
POWER_SUPPLY_PROP_TEMP_AMBIENT;
cm->charger_psy.num_properties++;
cm->desc->measure_battery_temp = true;
ret = 0;
}
#endif
if (cm->desc->measure_battery_temp) {
/* NOTICE : Default allowable minimum charge temperature is 0 */
if (!desc->temp_max)
desc->temp_max = CM_DEFAULT_CHARGE_TEMP_MAX;
if (!desc->temp_diff)
desc->temp_diff = CM_DEFAULT_RECHARGE_TEMP_DIFF;
}
return ret;
}
static struct of_device_id charger_manager_match[] = {
{
.compatible = "charger-manager",
},
{},
};
static struct charger_desc *of_cm_parse_desc(struct device *dev)
{
struct charger_desc *desc;
struct device_node *np = dev->of_node;
u32 poll_mode = CM_POLL_DISABLE;
u32 battery_stat = CM_NO_BATTERY;
int num_chgs = 0;
desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
if (!desc)
return ERR_PTR(-ENOMEM);
of_property_read_string(np, "cm-name", &desc->psy_name);
of_property_read_u32(np, "cm-poll-mode", &poll_mode);
desc->polling_mode = poll_mode;
of_property_read_u32(np, "cm-poll-interval",
&desc->polling_interval_ms);
of_property_read_u32(np, "cm-fullbatt-vchkdrop-ms",
&desc->fullbatt_vchkdrop_ms);
of_property_read_u32(np, "cm-fullbatt-vchkdrop-volt",
&desc->fullbatt_vchkdrop_uV);
of_property_read_u32(np, "cm-fullbatt-voltage", &desc->fullbatt_uV);
of_property_read_u32(np, "cm-fullbatt-soc", &desc->fullbatt_soc);
of_property_read_u32(np, "cm-fullbatt-capacity",
&desc->fullbatt_full_capacity);
of_property_read_u32(np, "cm-battery-stat", &battery_stat);
desc->battery_present = battery_stat;
/* chargers */
of_property_read_u32(np, "cm-num-chargers", &num_chgs);
if (num_chgs) {
/* Allocate empty bin at the tail of array */
desc->psy_charger_stat = devm_kzalloc(dev, sizeof(char *)
* (num_chgs + 1), GFP_KERNEL);
if (desc->psy_charger_stat) {
int i;
for (i = 0; i < num_chgs; i++)
of_property_read_string_index(np, "cm-chargers",
i, &desc->psy_charger_stat[i]);
} else {
return ERR_PTR(-ENOMEM);
}
}
of_property_read_string(np, "cm-fuel-gauge", &desc->psy_fuel_gauge);
of_property_read_string(np, "cm-thermal-zone", &desc->thermal_zone);
of_property_read_u32(np, "cm-battery-cold", &desc->temp_min);
if (of_get_property(np, "cm-battery-cold-in-minus", NULL))
desc->temp_min *= -1;
of_property_read_u32(np, "cm-battery-hot", &desc->temp_max);
of_property_read_u32(np, "cm-battery-temp-diff", &desc->temp_diff);
of_property_read_u32(np, "cm-charging-max",
&desc->charging_max_duration_ms);
of_property_read_u32(np, "cm-discharging-max",
&desc->discharging_max_duration_ms);
/* battery charger regualtors */
desc->num_charger_regulators = of_get_child_count(np);
if (desc->num_charger_regulators) {
struct charger_regulator *chg_regs;
struct device_node *child;
chg_regs = devm_kzalloc(dev, sizeof(*chg_regs)
* desc->num_charger_regulators,
GFP_KERNEL);
if (!chg_regs)
return ERR_PTR(-ENOMEM);
desc->charger_regulators = chg_regs;
for_each_child_of_node(np, child) {
struct charger_cable *cables;
struct device_node *_child;
of_property_read_string(child, "cm-regulator-name",
&chg_regs->regulator_name);
/* charger cables */
chg_regs->num_cables = of_get_child_count(child);
if (chg_regs->num_cables) {
cables = devm_kzalloc(dev, sizeof(*cables)
* chg_regs->num_cables,
GFP_KERNEL);
if (!cables)
return ERR_PTR(-ENOMEM);
chg_regs->cables = cables;
for_each_child_of_node(child, _child) {
of_property_read_string(_child,
"cm-cable-name", &cables->name);
of_property_read_string(_child,
"cm-cable-extcon",
&cables->extcon_name);
of_property_read_u32(_child,
"cm-cable-min",
&cables->min_uA);
of_property_read_u32(_child,
"cm-cable-max",
&cables->max_uA);
cables++;
}
}
chg_regs++;
}
}
return desc;
}
static inline struct charger_desc *cm_get_drv_data(struct platform_device *pdev)
{
if (pdev->dev.of_node)
return of_cm_parse_desc(&pdev->dev);
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);
struct charger_manager *cm;
int ret = 0, i = 0;
int j = 0;
union power_supply_propval val;
struct power_supply *fuel_gauge;
if (IS_ERR(desc)) {
dev_err(&pdev->dev, "No platform data (desc) found\n");
return -ENODEV;
}
cm = devm_kzalloc(&pdev->dev,
sizeof(struct charger_manager), GFP_KERNEL);
if (!cm)
return -ENOMEM;
/* Basic Values. Unspecified are Null or 0 */
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.
*/
if (desc->fullbatt_uV == 0) {
dev_info(&pdev->dev, "Ignoring full-battery voltage threshold as it is not supplied\n");
}
if (!desc->fullbatt_vchkdrop_ms || !desc->fullbatt_vchkdrop_uV) {
dev_info(&pdev->dev, "Disabling full-battery voltage drop checking mechanism as it is not supplied\n");
desc->fullbatt_vchkdrop_ms = 0;
desc->fullbatt_vchkdrop_uV = 0;
}
if (desc->fullbatt_soc == 0) {
dev_info(&pdev->dev, "Ignoring full-battery soc(state of charge) threshold as it is not supplied\n");
}
if (desc->fullbatt_full_capacity == 0) {
dev_info(&pdev->dev, "Ignoring full-battery full capacity threshold as it is not supplied\n");
}
if (!desc->charger_regulators || desc->num_charger_regulators < 1) {
dev_err(&pdev->dev, "charger_regulators undefined\n");
return -EINVAL;
}
if (!desc->psy_charger_stat || !desc->psy_charger_stat[0]) {
dev_err(&pdev->dev, "No power supply defined\n");
return -EINVAL;
}
if (!desc->psy_fuel_gauge) {
dev_err(&pdev->dev, "No fuel gauge power supply defined\n");
return -EINVAL;
}
/* Counting index only */
while (desc->psy_charger_stat[i])
i++;
/* Check if charger's supplies are present at probe */
for (i = 0; desc->psy_charger_stat[i]; i++) {
struct power_supply *psy;
psy = power_supply_get_by_name(desc->psy_charger_stat[i]);
if (!psy) {
dev_err(&pdev->dev, "Cannot find power supply \"%s\"\n",
desc->psy_charger_stat[i]);
return -ENODEV;
}
}
fuel_gauge = power_supply_get_by_name(desc->psy_fuel_gauge);
if (!fuel_gauge) {
dev_err(&pdev->dev, "Cannot find power supply \"%s\"\n",
desc->psy_fuel_gauge);
return -ENODEV;
}
if (desc->polling_interval_ms == 0 ||
msecs_to_jiffies(desc->polling_interval_ms) <= CM_JIFFIES_SMALL) {
dev_err(&pdev->dev, "polling_interval_ms is too small\n");
return -EINVAL;
}
if (!desc->charging_max_duration_ms ||
!desc->discharging_max_duration_ms) {
dev_info(&pdev->dev, "Cannot limit charging duration checking mechanism to prevent overcharge/overheat and control discharging duration\n");
desc->charging_max_duration_ms = 0;
desc->discharging_max_duration_ms = 0;
}
platform_set_drvdata(pdev, cm);
memcpy(&cm->charger_psy, &psy_default, sizeof(psy_default));
if (!desc->psy_name)
strncpy(cm->psy_name_buf, psy_default.name, PSY_NAME_MAX);
else
strncpy(cm->psy_name_buf, desc->psy_name, PSY_NAME_MAX);
cm->charger_psy.name = cm->psy_name_buf;
/* Allocate for psy properties because they may vary */
cm->charger_psy.properties = devm_kzalloc(&pdev->dev,
sizeof(enum power_supply_property)
* (ARRAY_SIZE(default_charger_props) +
NUM_CHARGER_PSY_OPTIONAL), GFP_KERNEL);
if (!cm->charger_psy.properties)
return -ENOMEM;
memcpy(cm->charger_psy.properties, default_charger_props,
sizeof(enum power_supply_property) *
ARRAY_SIZE(default_charger_props));
cm->charger_psy.num_properties = psy_default.num_properties;
/* Find which optional psy-properties are available */
if (!fuel_gauge->get_property(fuel_gauge,
POWER_SUPPLY_PROP_CHARGE_NOW, &val)) {
cm->charger_psy.properties[cm->charger_psy.num_properties] =
POWER_SUPPLY_PROP_CHARGE_NOW;
cm->charger_psy.num_properties++;
}
if (!fuel_gauge->get_property(fuel_gauge,
POWER_SUPPLY_PROP_CURRENT_NOW,
&val)) {
cm->charger_psy.properties[cm->charger_psy.num_properties] =
POWER_SUPPLY_PROP_CURRENT_NOW;
cm->charger_psy.num_properties++;
}
ret = cm_init_thermal_data(cm, fuel_gauge);
if (ret) {
dev_err(&pdev->dev, "Failed to initialize thermal data\n");
cm->desc->measure_battery_temp = false;
}
INIT_DELAYED_WORK(&cm->fullbatt_vchk_work, fullbatt_vchk);
ret = power_supply_register(NULL, &cm->charger_psy);
if (ret) {
dev_err(&pdev->dev, "Cannot register charger-manager with name \"%s\"\n",
cm->charger_psy.name);
return ret;
}
/* Register extcon device for charger cable */
ret = charger_manager_register_extcon(cm);
if (ret < 0) {
dev_err(&pdev->dev, "Cannot initialize extcon device\n");
goto err_reg_extcon;
}
/* Register sysfs entry for charger(regulator) */
ret = charger_manager_register_sysfs(cm);
if (ret < 0) {
dev_err(&pdev->dev,
"Cannot initialize sysfs entry of regulator\n");
goto err_reg_sysfs;
}
/* Add to the list */
mutex_lock(&cm_list_mtx);
list_add(&cm->entry, &cm_list);
mutex_unlock(&cm_list_mtx);
/*
* Charger-manager is capable of waking up the systme from sleep
* when event is happend through cm_notify_event()
*/
device_init_wakeup(&pdev->dev, true);
device_set_wakeup_capable(&pdev->dev, false);
/*
* Charger-manager have to check the charging state right after
* tialization of charger-manager and then update current charging
* state.
*/
cm_monitor();
schedule_work(&setup_polling);
return 0;
err_reg_sysfs:
for (i = 0; i < desc->num_charger_regulators; i++) {
struct charger_regulator *charger;
charger = &desc->charger_regulators[i];
sysfs_remove_group(&cm->charger_psy.dev->kobj,
&charger->attr_g);
}
err_reg_extcon:
for (i = 0; i < desc->num_charger_regulators; i++) {
struct charger_regulator *charger;
charger = &desc->charger_regulators[i];
for (j = 0; j < charger->num_cables; j++) {
struct charger_cable *cable = &charger->cables[j];
/* Remove notifier block if only edev exists */
if (cable->extcon_dev.edev)
extcon_unregister_interest(&cable->extcon_dev);
}
regulator_put(desc->charger_regulators[i].consumer);
}
power_supply_unregister(&cm->charger_psy);
return ret;
}
static int charger_manager_remove(struct platform_device *pdev)
{
struct charger_manager *cm = platform_get_drvdata(pdev);
struct charger_desc *desc = cm->desc;
int i = 0;
int j = 0;
/* Remove from the list */
mutex_lock(&cm_list_mtx);
list_del(&cm->entry);
mutex_unlock(&cm_list_mtx);
cancel_work_sync(&setup_polling);
cancel_delayed_work_sync(&cm_monitor_work);
for (i = 0 ; i < desc->num_charger_regulators ; i++) {
struct charger_regulator *charger
= &desc->charger_regulators[i];
for (j = 0 ; j < charger->num_cables ; j++) {
struct charger_cable *cable = &charger->cables[j];
extcon_unregister_interest(&cable->extcon_dev);
}
}
for (i = 0 ; i < desc->num_charger_regulators ; i++)
regulator_put(desc->charger_regulators[i].consumer);
power_supply_unregister(&cm->charger_psy);
try_charger_enable(cm, false);
return 0;
}
static const struct platform_device_id charger_manager_id[] = {
{ "charger-manager", 0 },
{ },
};
MODULE_DEVICE_TABLE(platform, charger_manager_id);
static int cm_suspend_noirq(struct device *dev)
{
int ret = 0;
if (device_may_wakeup(dev)) {
device_set_wakeup_capable(dev, false);
ret = -EAGAIN;
}
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_need_to_awake())
return -EBUSY;
if (!cm_suspended)
cm_suspended = true;
cm_timer_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;
}
static void cm_suspend_complete(struct device *dev)
{
struct charger_manager *cm = dev_get_drvdata(dev);
if (cm_suspended)
cm_suspended = 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;
unsigned long now = jiffies + CM_JIFFIES_SMALL;
if (time_after_eq(now, cm->fullbatt_vchk_jiffies_at)) {
delay = (unsigned long)((long)now
- (long)(cm->fullbatt_vchk_jiffies_at));
delay = jiffies_to_msecs(delay);
} else {
delay = 0;
}
/*
* Account for cm_suspend_duration_ms with assuming that
* timer stops in suspend.
*/
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);
}
static const struct dev_pm_ops charger_manager_pm = {
.prepare = cm_suspend_prepare,
.suspend_noirq = cm_suspend_noirq,
.complete = cm_suspend_complete,
};
static struct platform_driver charger_manager_driver = {
.driver = {
.name = "charger-manager",
.pm = &charger_manager_pm,
.of_match_table = charger_manager_match,
},
.probe = charger_manager_probe,
.remove = charger_manager_remove,
.id_table = charger_manager_id,
};
static int __init charger_manager_init(void)
{
cm_wq = create_freezable_workqueue("charger_manager");
INIT_DELAYED_WORK(&cm_monitor_work, cm_monitor_poller);
return platform_driver_register(&charger_manager_driver);
}
late_initcall(charger_manager_init);
static void __exit charger_manager_cleanup(void)
{
destroy_workqueue(cm_wq);
cm_wq = NULL;
platform_driver_unregister(&charger_manager_driver);
}
module_exit(charger_manager_cleanup);
/**
* find_power_supply - find the associated power_supply of charger
* @cm: the Charger Manager representing the battery
* @psy: pointer to instance of charger's power_supply
*/
static bool find_power_supply(struct charger_manager *cm,
struct power_supply *psy)
{
int i;
bool found = false;
for (i = 0; cm->desc->psy_charger_stat[i]; i++) {
if (!strcmp(psy->name, cm->desc->psy_charger_stat[i])) {
found = true;
break;
}
}
return found;
}
/**
* cm_notify_event - charger driver notify Charger Manager of charger event
* @psy: pointer to instance of charger's power_supply
* @type: type of charger event
* @msg: optional message passed to uevent_notify fuction
*/
void cm_notify_event(struct power_supply *psy, enum cm_event_types type,
char *msg)
{
struct charger_manager *cm;
bool found_power_supply = false;
if (psy == NULL)
return;
mutex_lock(&cm_list_mtx);
list_for_each_entry(cm, &cm_list, entry) {
found_power_supply = find_power_supply(cm, psy);
if (found_power_supply)
break;
}
mutex_unlock(&cm_list_mtx);
if (!found_power_supply)
return;
switch (type) {
case CM_EVENT_BATT_FULL:
fullbatt_handler(cm);
break;
case CM_EVENT_BATT_OUT:
battout_handler(cm);
break;
case CM_EVENT_BATT_IN:
case CM_EVENT_EXT_PWR_IN_OUT ... CM_EVENT_CHG_START_STOP:
misc_event_handler(cm, type);
break;
case CM_EVENT_UNKNOWN:
case CM_EVENT_OTHERS:
uevent_notify(cm, msg ? msg : default_event_names[type]);
break;
default:
dev_err(cm->dev, "%s: type not specified\n", __func__);
break;
}
}
EXPORT_SYMBOL_GPL(cm_notify_event);
MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
MODULE_DESCRIPTION("Charger Manager");
MODULE_LICENSE("GPL");