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linux/drivers/power/abx500_chargalg.c

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/*
* Copyright (C) ST-Ericsson SA 2012
* Copyright (c) 2012 Sony Mobile Communications AB
*
* Charging algorithm driver for abx500 variants
*
* License Terms: GNU General Public License v2
* Authors:
* Johan Palsson <johan.palsson@stericsson.com>
* Karl Komierowski <karl.komierowski@stericsson.com>
* Arun R Murthy <arun.murthy@stericsson.com>
* Author: Imre Sunyi <imre.sunyi@sonymobile.com>
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/hrtimer.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/completion.h>
#include <linux/workqueue.h>
#include <linux/kobject.h>
#include <linux/of.h>
#include <linux/mfd/core.h>
#include <linux/mfd/abx500.h>
#include <linux/mfd/abx500/ab8500.h>
#include <linux/mfd/abx500/ux500_chargalg.h>
#include <linux/mfd/abx500/ab8500-bm.h>
#include <linux/notifier.h>
/* Watchdog kick interval */
#define CHG_WD_INTERVAL (6 * HZ)
/* End-of-charge criteria counter */
#define EOC_COND_CNT 10
/* One hour expressed in seconds */
#define ONE_HOUR_IN_SECONDS 3600
/* Five minutes expressed in seconds */
#define FIVE_MINUTES_IN_SECONDS 300
/* Plus margin for the low battery threshold */
#define BAT_PLUS_MARGIN (100)
#define CHARGALG_CURR_STEP_LOW 0
#define CHARGALG_CURR_STEP_HIGH 100
enum abx500_chargers {
NO_CHG,
AC_CHG,
USB_CHG,
};
struct abx500_chargalg_charger_info {
enum abx500_chargers conn_chg;
enum abx500_chargers prev_conn_chg;
enum abx500_chargers online_chg;
enum abx500_chargers prev_online_chg;
enum abx500_chargers charger_type;
bool usb_chg_ok;
bool ac_chg_ok;
int usb_volt;
int usb_curr;
int ac_volt;
int ac_curr;
int usb_vset;
int usb_iset;
int ac_vset;
int ac_iset;
};
struct abx500_chargalg_suspension_status {
bool suspended_change;
bool ac_suspended;
bool usb_suspended;
};
struct abx500_chargalg_current_step_status {
bool curr_step_change;
int curr_step;
};
struct abx500_chargalg_battery_data {
int temp;
int volt;
int avg_curr;
int inst_curr;
int percent;
};
enum abx500_chargalg_states {
STATE_HANDHELD_INIT,
STATE_HANDHELD,
STATE_CHG_NOT_OK_INIT,
STATE_CHG_NOT_OK,
STATE_HW_TEMP_PROTECT_INIT,
STATE_HW_TEMP_PROTECT,
STATE_NORMAL_INIT,
STATE_USB_PP_PRE_CHARGE,
STATE_NORMAL,
STATE_WAIT_FOR_RECHARGE_INIT,
STATE_WAIT_FOR_RECHARGE,
STATE_MAINTENANCE_A_INIT,
STATE_MAINTENANCE_A,
STATE_MAINTENANCE_B_INIT,
STATE_MAINTENANCE_B,
STATE_TEMP_UNDEROVER_INIT,
STATE_TEMP_UNDEROVER,
STATE_TEMP_LOWHIGH_INIT,
STATE_TEMP_LOWHIGH,
STATE_SUSPENDED_INIT,
STATE_SUSPENDED,
STATE_OVV_PROTECT_INIT,
STATE_OVV_PROTECT,
STATE_SAFETY_TIMER_EXPIRED_INIT,
STATE_SAFETY_TIMER_EXPIRED,
STATE_BATT_REMOVED_INIT,
STATE_BATT_REMOVED,
STATE_WD_EXPIRED_INIT,
STATE_WD_EXPIRED,
};
static const char *states[] = {
"HANDHELD_INIT",
"HANDHELD",
"CHG_NOT_OK_INIT",
"CHG_NOT_OK",
"HW_TEMP_PROTECT_INIT",
"HW_TEMP_PROTECT",
"NORMAL_INIT",
"USB_PP_PRE_CHARGE",
"NORMAL",
"WAIT_FOR_RECHARGE_INIT",
"WAIT_FOR_RECHARGE",
"MAINTENANCE_A_INIT",
"MAINTENANCE_A",
"MAINTENANCE_B_INIT",
"MAINTENANCE_B",
"TEMP_UNDEROVER_INIT",
"TEMP_UNDEROVER",
"TEMP_LOWHIGH_INIT",
"TEMP_LOWHIGH",
"SUSPENDED_INIT",
"SUSPENDED",
"OVV_PROTECT_INIT",
"OVV_PROTECT",
"SAFETY_TIMER_EXPIRED_INIT",
"SAFETY_TIMER_EXPIRED",
"BATT_REMOVED_INIT",
"BATT_REMOVED",
"WD_EXPIRED_INIT",
"WD_EXPIRED",
};
struct abx500_chargalg_events {
bool batt_unknown;
bool mainextchnotok;
bool batt_ovv;
bool batt_rem;
bool btemp_underover;
bool btemp_lowhigh;
bool main_thermal_prot;
bool usb_thermal_prot;
bool main_ovv;
bool vbus_ovv;
bool usbchargernotok;
bool safety_timer_expired;
bool maintenance_timer_expired;
bool ac_wd_expired;
bool usb_wd_expired;
bool ac_cv_active;
bool usb_cv_active;
bool vbus_collapsed;
};
/**
* struct abx500_charge_curr_maximization - Charger maximization parameters
* @original_iset: the non optimized/maximised charger current
* @current_iset: the charging current used at this moment
* @test_delta_i: the delta between the current we want to charge and the
current that is really going into the battery
* @condition_cnt: number of iterations needed before a new charger current
is set
* @max_current: maximum charger current
* @wait_cnt: to avoid too fast current step down in case of charger
* voltage collapse, we insert this delay between step
* down
* @level: tells in how many steps the charging current has been
increased
*/
struct abx500_charge_curr_maximization {
int original_iset;
int current_iset;
int test_delta_i;
int condition_cnt;
int max_current;
int wait_cnt;
u8 level;
};
enum maxim_ret {
MAXIM_RET_NOACTION,
MAXIM_RET_CHANGE,
MAXIM_RET_IBAT_TOO_HIGH,
};
/**
* struct abx500_chargalg - abx500 Charging algorithm device information
* @dev: pointer to the structure device
* @charge_status: battery operating status
* @eoc_cnt: counter used to determine end-of_charge
* @maintenance_chg: indicate if maintenance charge is active
* @t_hyst_norm temperature hysteresis when the temperature has been
* over or under normal limits
* @t_hyst_lowhigh temperature hysteresis when the temperature has been
* over or under the high or low limits
* @charge_state: current state of the charging algorithm
* @ccm charging current maximization parameters
* @chg_info: information about connected charger types
* @batt_data: data of the battery
* @susp_status: current charger suspension status
* @bm: Platform specific battery management information
* @curr_status: Current step status for over-current protection
* @parent: pointer to the struct abx500
* @chargalg_psy: structure that holds the battery properties exposed by
* the charging algorithm
* @events: structure for information about events triggered
* @chargalg_wq: work queue for running the charging algorithm
* @chargalg_periodic_work: work to run the charging algorithm periodically
* @chargalg_wd_work: work to kick the charger watchdog periodically
* @chargalg_work: work to run the charging algorithm instantly
* @safety_timer: charging safety timer
* @maintenance_timer: maintenance charging timer
* @chargalg_kobject: structure of type kobject
*/
struct abx500_chargalg {
struct device *dev;
int charge_status;
int eoc_cnt;
bool maintenance_chg;
int t_hyst_norm;
int t_hyst_lowhigh;
enum abx500_chargalg_states charge_state;
struct abx500_charge_curr_maximization ccm;
struct abx500_chargalg_charger_info chg_info;
struct abx500_chargalg_battery_data batt_data;
struct abx500_chargalg_suspension_status susp_status;
struct ab8500 *parent;
struct abx500_chargalg_current_step_status curr_status;
struct abx500_bm_data *bm;
struct power_supply *chargalg_psy;
struct ux500_charger *ac_chg;
struct ux500_charger *usb_chg;
struct abx500_chargalg_events events;
struct workqueue_struct *chargalg_wq;
struct delayed_work chargalg_periodic_work;
struct delayed_work chargalg_wd_work;
struct work_struct chargalg_work;
struct hrtimer safety_timer;
struct hrtimer maintenance_timer;
struct kobject chargalg_kobject;
};
/*External charger prepare notifier*/
BLOCKING_NOTIFIER_HEAD(charger_notifier_list);
/* Main battery properties */
static enum power_supply_property abx500_chargalg_props[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_HEALTH,
};
struct abx500_chargalg_sysfs_entry {
struct attribute attr;
ssize_t (*show)(struct abx500_chargalg *, char *);
ssize_t (*store)(struct abx500_chargalg *, const char *, size_t);
};
/**
* abx500_chargalg_safety_timer_expired() - Expiration of the safety timer
* @timer: pointer to the hrtimer structure
*
* This function gets called when the safety timer for the charger
* expires
*/
static enum hrtimer_restart
abx500_chargalg_safety_timer_expired(struct hrtimer *timer)
{
struct abx500_chargalg *di = container_of(timer, struct abx500_chargalg,
safety_timer);
dev_err(di->dev, "Safety timer expired\n");
di->events.safety_timer_expired = true;
/* Trigger execution of the algorithm instantly */
queue_work(di->chargalg_wq, &di->chargalg_work);
return HRTIMER_NORESTART;
}
/**
* abx500_chargalg_maintenance_timer_expired() - Expiration of
* the maintenance timer
* @timer: pointer to the timer structure
*
* This function gets called when the maintenence timer
* expires
*/
static enum hrtimer_restart
abx500_chargalg_maintenance_timer_expired(struct hrtimer *timer)
{
struct abx500_chargalg *di = container_of(timer, struct abx500_chargalg,
maintenance_timer);
dev_dbg(di->dev, "Maintenance timer expired\n");
di->events.maintenance_timer_expired = true;
/* Trigger execution of the algorithm instantly */
queue_work(di->chargalg_wq, &di->chargalg_work);
return HRTIMER_NORESTART;
}
/**
* abx500_chargalg_state_to() - Change charge state
* @di: pointer to the abx500_chargalg structure
*
* This function gets called when a charge state change should occur
*/
static void abx500_chargalg_state_to(struct abx500_chargalg *di,
enum abx500_chargalg_states state)
{
dev_dbg(di->dev,
"State changed: %s (From state: [%d] %s =to=> [%d] %s )\n",
di->charge_state == state ? "NO" : "YES",
di->charge_state,
states[di->charge_state],
state,
states[state]);
di->charge_state = state;
}
static int abx500_chargalg_check_charger_enable(struct abx500_chargalg *di)
{
switch (di->charge_state) {
case STATE_NORMAL:
case STATE_MAINTENANCE_A:
case STATE_MAINTENANCE_B:
break;
default:
return 0;
}
if (di->chg_info.charger_type & USB_CHG) {
return di->usb_chg->ops.check_enable(di->usb_chg,
di->bm->bat_type[di->bm->batt_id].normal_vol_lvl,
di->bm->bat_type[di->bm->batt_id].normal_cur_lvl);
} else if ((di->chg_info.charger_type & AC_CHG) &&
!(di->ac_chg->external)) {
return di->ac_chg->ops.check_enable(di->ac_chg,
di->bm->bat_type[di->bm->batt_id].normal_vol_lvl,
di->bm->bat_type[di->bm->batt_id].normal_cur_lvl);
}
return 0;
}
/**
* abx500_chargalg_check_charger_connection() - Check charger connection change
* @di: pointer to the abx500_chargalg structure
*
* This function will check if there is a change in the charger connection
* and change charge state accordingly. AC has precedence over USB.
*/
static int abx500_chargalg_check_charger_connection(struct abx500_chargalg *di)
{
if (di->chg_info.conn_chg != di->chg_info.prev_conn_chg ||
di->susp_status.suspended_change) {
/*
* Charger state changed or suspension
* has changed since last update
*/
if ((di->chg_info.conn_chg & AC_CHG) &&
!di->susp_status.ac_suspended) {
dev_dbg(di->dev, "Charging source is AC\n");
if (di->chg_info.charger_type != AC_CHG) {
di->chg_info.charger_type = AC_CHG;
abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
}
} else if ((di->chg_info.conn_chg & USB_CHG) &&
!di->susp_status.usb_suspended) {
dev_dbg(di->dev, "Charging source is USB\n");
di->chg_info.charger_type = USB_CHG;
abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
} else if (di->chg_info.conn_chg &&
(di->susp_status.ac_suspended ||
di->susp_status.usb_suspended)) {
dev_dbg(di->dev, "Charging is suspended\n");
di->chg_info.charger_type = NO_CHG;
abx500_chargalg_state_to(di, STATE_SUSPENDED_INIT);
} else {
dev_dbg(di->dev, "Charging source is OFF\n");
di->chg_info.charger_type = NO_CHG;
abx500_chargalg_state_to(di, STATE_HANDHELD_INIT);
}
di->chg_info.prev_conn_chg = di->chg_info.conn_chg;
di->susp_status.suspended_change = false;
}
return di->chg_info.conn_chg;
}
/**
* abx500_chargalg_check_current_step_status() - Check charging current
* step status.
* @di: pointer to the abx500_chargalg structure
*
* This function will check if there is a change in the charging current step
* and change charge state accordingly.
*/
static void abx500_chargalg_check_current_step_status
(struct abx500_chargalg *di)
{
if (di->curr_status.curr_step_change)
abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
di->curr_status.curr_step_change = false;
}
/**
* abx500_chargalg_start_safety_timer() - Start charging safety timer
* @di: pointer to the abx500_chargalg structure
*
* The safety timer is used to avoid overcharging of old or bad batteries.
* There are different timers for AC and USB
*/
static void abx500_chargalg_start_safety_timer(struct abx500_chargalg *di)
{
/* Charger-dependent expiration time in hours*/
int timer_expiration = 0;
switch (di->chg_info.charger_type) {
case AC_CHG:
timer_expiration = di->bm->main_safety_tmr_h;
break;
case USB_CHG:
timer_expiration = di->bm->usb_safety_tmr_h;
break;
default:
dev_err(di->dev, "Unknown charger to charge from\n");
break;
}
di->events.safety_timer_expired = false;
hrtimer_set_expires_range(&di->safety_timer,
ktime_set(timer_expiration * ONE_HOUR_IN_SECONDS, 0),
ktime_set(FIVE_MINUTES_IN_SECONDS, 0));
hrtimer_start_expires(&di->safety_timer, HRTIMER_MODE_REL);
}
/**
* abx500_chargalg_stop_safety_timer() - Stop charging safety timer
* @di: pointer to the abx500_chargalg structure
*
* The safety timer is stopped whenever the NORMAL state is exited
*/
static void abx500_chargalg_stop_safety_timer(struct abx500_chargalg *di)
{
if (hrtimer_try_to_cancel(&di->safety_timer) >= 0)
di->events.safety_timer_expired = false;
}
/**
* abx500_chargalg_start_maintenance_timer() - Start charging maintenance timer
* @di: pointer to the abx500_chargalg structure
* @duration: duration of ther maintenance timer in hours
*
* The maintenance timer is used to maintain the charge in the battery once
* the battery is considered full. These timers are chosen to match the
* discharge curve of the battery
*/
static void abx500_chargalg_start_maintenance_timer(struct abx500_chargalg *di,
int duration)
{
hrtimer_set_expires_range(&di->maintenance_timer,
ktime_set(duration * ONE_HOUR_IN_SECONDS, 0),
ktime_set(FIVE_MINUTES_IN_SECONDS, 0));
di->events.maintenance_timer_expired = false;
hrtimer_start_expires(&di->maintenance_timer, HRTIMER_MODE_REL);
}
/**
* abx500_chargalg_stop_maintenance_timer() - Stop maintenance timer
* @di: pointer to the abx500_chargalg structure
*
* The maintenance timer is stopped whenever maintenance ends or when another
* state is entered
*/
static void abx500_chargalg_stop_maintenance_timer(struct abx500_chargalg *di)
{
if (hrtimer_try_to_cancel(&di->maintenance_timer) >= 0)
di->events.maintenance_timer_expired = false;
}
/**
* abx500_chargalg_kick_watchdog() - Kick charger watchdog
* @di: pointer to the abx500_chargalg structure
*
* The charger watchdog have to be kicked periodically whenever the charger is
* on, else the ABB will reset the system
*/
static int abx500_chargalg_kick_watchdog(struct abx500_chargalg *di)
{
/* Check if charger exists and kick watchdog if charging */
if (di->ac_chg && di->ac_chg->ops.kick_wd &&
di->chg_info.online_chg & AC_CHG) {
/*
* If AB charger watchdog expired, pm2xxx charging
* gets disabled. To be safe, kick both AB charger watchdog
* and pm2xxx watchdog.
*/
if (di->ac_chg->external &&
di->usb_chg && di->usb_chg->ops.kick_wd)
di->usb_chg->ops.kick_wd(di->usb_chg);
return di->ac_chg->ops.kick_wd(di->ac_chg);
}
else if (di->usb_chg && di->usb_chg->ops.kick_wd &&
di->chg_info.online_chg & USB_CHG)
return di->usb_chg->ops.kick_wd(di->usb_chg);
return -ENXIO;
}
/**
* abx500_chargalg_ac_en() - Turn on/off the AC charger
* @di: pointer to the abx500_chargalg structure
* @enable: charger on/off
* @vset: requested charger output voltage
* @iset: requested charger output current
*
* The AC charger will be turned on/off with the requested charge voltage and
* current
*/
static int abx500_chargalg_ac_en(struct abx500_chargalg *di, int enable,
int vset, int iset)
{
static int abx500_chargalg_ex_ac_enable_toggle;
if (!di->ac_chg || !di->ac_chg->ops.enable)
return -ENXIO;
/* Select maximum of what both the charger and the battery supports */
if (di->ac_chg->max_out_volt)
vset = min(vset, di->ac_chg->max_out_volt);
if (di->ac_chg->max_out_curr)
iset = min(iset, di->ac_chg->max_out_curr);
di->chg_info.ac_iset = iset;
di->chg_info.ac_vset = vset;
/* Enable external charger */
if (enable && di->ac_chg->external &&
!abx500_chargalg_ex_ac_enable_toggle) {
blocking_notifier_call_chain(&charger_notifier_list,
0, di->dev);
abx500_chargalg_ex_ac_enable_toggle++;
}
return di->ac_chg->ops.enable(di->ac_chg, enable, vset, iset);
}
/**
* abx500_chargalg_usb_en() - Turn on/off the USB charger
* @di: pointer to the abx500_chargalg structure
* @enable: charger on/off
* @vset: requested charger output voltage
* @iset: requested charger output current
*
* The USB charger will be turned on/off with the requested charge voltage and
* current
*/
static int abx500_chargalg_usb_en(struct abx500_chargalg *di, int enable,
int vset, int iset)
{
if (!di->usb_chg || !di->usb_chg->ops.enable)
return -ENXIO;
/* Select maximum of what both the charger and the battery supports */
if (di->usb_chg->max_out_volt)
vset = min(vset, di->usb_chg->max_out_volt);
if (di->usb_chg->max_out_curr)
iset = min(iset, di->usb_chg->max_out_curr);
di->chg_info.usb_iset = iset;
di->chg_info.usb_vset = vset;
return di->usb_chg->ops.enable(di->usb_chg, enable, vset, iset);
}
/**
* ab8540_chargalg_usb_pp_en() - Enable/ disable USB power path
* @di: pointer to the abx500_chargalg structure
* @enable: power path enable/disable
*
* The USB power path will be enable/ disable
*/
static int ab8540_chargalg_usb_pp_en(struct abx500_chargalg *di, bool enable)
{
if (!di->usb_chg || !di->usb_chg->ops.pp_enable)
return -ENXIO;
return di->usb_chg->ops.pp_enable(di->usb_chg, enable);
}
/**
* ab8540_chargalg_usb_pre_chg_en() - Enable/ disable USB pre-charge
* @di: pointer to the abx500_chargalg structure
* @enable: USB pre-charge enable/disable
*
* The USB USB pre-charge will be enable/ disable
*/
static int ab8540_chargalg_usb_pre_chg_en(struct abx500_chargalg *di,
bool enable)
{
if (!di->usb_chg || !di->usb_chg->ops.pre_chg_enable)
return -ENXIO;
return di->usb_chg->ops.pre_chg_enable(di->usb_chg, enable);
}
/**
* abx500_chargalg_update_chg_curr() - Update charger current
* @di: pointer to the abx500_chargalg structure
* @iset: requested charger output current
*
* The charger output current will be updated for the charger
* that is currently in use
*/
static int abx500_chargalg_update_chg_curr(struct abx500_chargalg *di,
int iset)
{
/* Check if charger exists and update current if charging */
if (di->ac_chg && di->ac_chg->ops.update_curr &&
di->chg_info.charger_type & AC_CHG) {
/*
* Select maximum of what both the charger
* and the battery supports
*/
if (di->ac_chg->max_out_curr)
iset = min(iset, di->ac_chg->max_out_curr);
di->chg_info.ac_iset = iset;
return di->ac_chg->ops.update_curr(di->ac_chg, iset);
} else if (di->usb_chg && di->usb_chg->ops.update_curr &&
di->chg_info.charger_type & USB_CHG) {
/*
* Select maximum of what both the charger
* and the battery supports
*/
if (di->usb_chg->max_out_curr)
iset = min(iset, di->usb_chg->max_out_curr);
di->chg_info.usb_iset = iset;
return di->usb_chg->ops.update_curr(di->usb_chg, iset);
}
return -ENXIO;
}
/**
* abx500_chargalg_stop_charging() - Stop charging
* @di: pointer to the abx500_chargalg structure
*
* This function is called from any state where charging should be stopped.
* All charging is disabled and all status parameters and timers are changed
* accordingly
*/
static void abx500_chargalg_stop_charging(struct abx500_chargalg *di)
{
abx500_chargalg_ac_en(di, false, 0, 0);
abx500_chargalg_usb_en(di, false, 0, 0);
abx500_chargalg_stop_safety_timer(di);
abx500_chargalg_stop_maintenance_timer(di);
di->charge_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
di->maintenance_chg = false;
cancel_delayed_work(&di->chargalg_wd_work);
power_supply_changed(di->chargalg_psy);
}
/**
* abx500_chargalg_hold_charging() - Pauses charging
* @di: pointer to the abx500_chargalg structure
*
* This function is called in the case where maintenance charging has been
* disabled and instead a battery voltage mode is entered to check when the
* battery voltage has reached a certain recharge voltage
*/
static void abx500_chargalg_hold_charging(struct abx500_chargalg *di)
{
abx500_chargalg_ac_en(di, false, 0, 0);
abx500_chargalg_usb_en(di, false, 0, 0);
abx500_chargalg_stop_safety_timer(di);
abx500_chargalg_stop_maintenance_timer(di);
di->charge_status = POWER_SUPPLY_STATUS_CHARGING;
di->maintenance_chg = false;
cancel_delayed_work(&di->chargalg_wd_work);
power_supply_changed(di->chargalg_psy);
}
/**
* abx500_chargalg_start_charging() - Start the charger
* @di: pointer to the abx500_chargalg structure
* @vset: requested charger output voltage
* @iset: requested charger output current
*
* A charger will be enabled depending on the requested charger type that was
* detected previously.
*/
static void abx500_chargalg_start_charging(struct abx500_chargalg *di,
int vset, int iset)
{
switch (di->chg_info.charger_type) {
case AC_CHG:
dev_dbg(di->dev,
"AC parameters: Vset %d, Ich %d\n", vset, iset);
abx500_chargalg_usb_en(di, false, 0, 0);
abx500_chargalg_ac_en(di, true, vset, iset);
break;
case USB_CHG:
dev_dbg(di->dev,
"USB parameters: Vset %d, Ich %d\n", vset, iset);
abx500_chargalg_ac_en(di, false, 0, 0);
abx500_chargalg_usb_en(di, true, vset, iset);
break;
default:
dev_err(di->dev, "Unknown charger to charge from\n");
break;
}
}
/**
* abx500_chargalg_check_temp() - Check battery temperature ranges
* @di: pointer to the abx500_chargalg structure
*
* The battery temperature is checked against the predefined limits and the
* charge state is changed accordingly
*/
static void abx500_chargalg_check_temp(struct abx500_chargalg *di)
{
if (di->batt_data.temp > (di->bm->temp_low + di->t_hyst_norm) &&
di->batt_data.temp < (di->bm->temp_high - di->t_hyst_norm)) {
/* Temp OK! */
di->events.btemp_underover = false;
di->events.btemp_lowhigh = false;
di->t_hyst_norm = 0;
di->t_hyst_lowhigh = 0;
} else {
if (((di->batt_data.temp >= di->bm->temp_high) &&
(di->batt_data.temp <
(di->bm->temp_over - di->t_hyst_lowhigh))) ||
((di->batt_data.temp >
(di->bm->temp_under + di->t_hyst_lowhigh)) &&
(di->batt_data.temp <= di->bm->temp_low))) {
/* TEMP minor!!!!! */
di->events.btemp_underover = false;
di->events.btemp_lowhigh = true;
di->t_hyst_norm = di->bm->temp_hysteresis;
di->t_hyst_lowhigh = 0;
} else if (di->batt_data.temp <= di->bm->temp_under ||
di->batt_data.temp >= di->bm->temp_over) {
/* TEMP major!!!!! */
di->events.btemp_underover = true;
di->events.btemp_lowhigh = false;
di->t_hyst_norm = 0;
di->t_hyst_lowhigh = di->bm->temp_hysteresis;
} else {
/* Within hysteresis */
dev_dbg(di->dev, "Within hysteresis limit temp: %d "
"hyst_lowhigh %d, hyst normal %d\n",
di->batt_data.temp, di->t_hyst_lowhigh,
di->t_hyst_norm);
}
}
}
/**
* abx500_chargalg_check_charger_voltage() - Check charger voltage
* @di: pointer to the abx500_chargalg structure
*
* Charger voltage is checked against maximum limit
*/
static void abx500_chargalg_check_charger_voltage(struct abx500_chargalg *di)
{
if (di->chg_info.usb_volt > di->bm->chg_params->usb_volt_max)
di->chg_info.usb_chg_ok = false;
else
di->chg_info.usb_chg_ok = true;
if (di->chg_info.ac_volt > di->bm->chg_params->ac_volt_max)
di->chg_info.ac_chg_ok = false;
else
di->chg_info.ac_chg_ok = true;
}
/**
* abx500_chargalg_end_of_charge() - Check if end-of-charge criteria is fulfilled
* @di: pointer to the abx500_chargalg structure
*
* End-of-charge criteria is fulfilled when the battery voltage is above a
* certain limit and the battery current is below a certain limit for a
* predefined number of consecutive seconds. If true, the battery is full
*/
static void abx500_chargalg_end_of_charge(struct abx500_chargalg *di)
{
if (di->charge_status == POWER_SUPPLY_STATUS_CHARGING &&
di->charge_state == STATE_NORMAL &&
!di->maintenance_chg && (di->batt_data.volt >=
di->bm->bat_type[di->bm->batt_id].termination_vol ||
di->events.usb_cv_active || di->events.ac_cv_active) &&
di->batt_data.avg_curr <
di->bm->bat_type[di->bm->batt_id].termination_curr &&
di->batt_data.avg_curr > 0) {
if (++di->eoc_cnt >= EOC_COND_CNT) {
di->eoc_cnt = 0;
if ((di->chg_info.charger_type & USB_CHG) &&
(di->usb_chg->power_path))
ab8540_chargalg_usb_pp_en(di, true);
di->charge_status = POWER_SUPPLY_STATUS_FULL;
di->maintenance_chg = true;
dev_dbg(di->dev, "EOC reached!\n");
power_supply_changed(di->chargalg_psy);
} else {
dev_dbg(di->dev,
" EOC limit reached for the %d"
" time, out of %d before EOC\n",
di->eoc_cnt,
EOC_COND_CNT);
}
} else {
di->eoc_cnt = 0;
}
}
static void init_maxim_chg_curr(struct abx500_chargalg *di)
{
di->ccm.original_iset =
di->bm->bat_type[di->bm->batt_id].normal_cur_lvl;
di->ccm.current_iset =
di->bm->bat_type[di->bm->batt_id].normal_cur_lvl;
di->ccm.test_delta_i = di->bm->maxi->charger_curr_step;
di->ccm.max_current = di->bm->maxi->chg_curr;
di->ccm.condition_cnt = di->bm->maxi->wait_cycles;
di->ccm.level = 0;
}
/**
* abx500_chargalg_chg_curr_maxim - increases the charger current to
* compensate for the system load
* @di pointer to the abx500_chargalg structure
*
* This maximization function is used to raise the charger current to get the
* battery current as close to the optimal value as possible. The battery
* current during charging is affected by the system load
*/
static enum maxim_ret abx500_chargalg_chg_curr_maxim(struct abx500_chargalg *di)
{
int delta_i;
if (!di->bm->maxi->ena_maxi)
return MAXIM_RET_NOACTION;
delta_i = di->ccm.original_iset - di->batt_data.inst_curr;
if (di->events.vbus_collapsed) {
dev_dbg(di->dev, "Charger voltage has collapsed %d\n",
di->ccm.wait_cnt);
if (di->ccm.wait_cnt == 0) {
dev_dbg(di->dev, "lowering current\n");
di->ccm.wait_cnt++;
di->ccm.condition_cnt = di->bm->maxi->wait_cycles;
di->ccm.max_current =
di->ccm.current_iset - di->ccm.test_delta_i;
di->ccm.current_iset = di->ccm.max_current;
di->ccm.level--;
return MAXIM_RET_CHANGE;
} else {
dev_dbg(di->dev, "waiting\n");
/* Let's go in here twice before lowering curr again */
di->ccm.wait_cnt = (di->ccm.wait_cnt + 1) % 3;
return MAXIM_RET_NOACTION;
}
}
di->ccm.wait_cnt = 0;
if ((di->batt_data.inst_curr > di->ccm.original_iset)) {
dev_dbg(di->dev, " Maximization Ibat (%dmA) too high"
" (limit %dmA) (current iset: %dmA)!\n",
di->batt_data.inst_curr, di->ccm.original_iset,
di->ccm.current_iset);
if (di->ccm.current_iset == di->ccm.original_iset)
return MAXIM_RET_NOACTION;
di->ccm.condition_cnt = di->bm->maxi->wait_cycles;
di->ccm.current_iset = di->ccm.original_iset;
di->ccm.level = 0;
return MAXIM_RET_IBAT_TOO_HIGH;
}
if (delta_i > di->ccm.test_delta_i &&
(di->ccm.current_iset + di->ccm.test_delta_i) <
di->ccm.max_current) {
if (di->ccm.condition_cnt-- == 0) {
/* Increse the iset with cco.test_delta_i */
di->ccm.condition_cnt = di->bm->maxi->wait_cycles;
di->ccm.current_iset += di->ccm.test_delta_i;
di->ccm.level++;
dev_dbg(di->dev, " Maximization needed, increase"
" with %d mA to %dmA (Optimal ibat: %d)"
" Level %d\n",
di->ccm.test_delta_i,
di->ccm.current_iset,
di->ccm.original_iset,
di->ccm.level);
return MAXIM_RET_CHANGE;
} else {
return MAXIM_RET_NOACTION;
}
} else {
di->ccm.condition_cnt = di->bm->maxi->wait_cycles;
return MAXIM_RET_NOACTION;
}
}
static void handle_maxim_chg_curr(struct abx500_chargalg *di)
{
enum maxim_ret ret;
int result;
ret = abx500_chargalg_chg_curr_maxim(di);
switch (ret) {
case MAXIM_RET_CHANGE:
result = abx500_chargalg_update_chg_curr(di,
di->ccm.current_iset);
if (result)
dev_err(di->dev, "failed to set chg curr\n");
break;
case MAXIM_RET_IBAT_TOO_HIGH:
result = abx500_chargalg_update_chg_curr(di,
di->bm->bat_type[di->bm->batt_id].normal_cur_lvl);
if (result)
dev_err(di->dev, "failed to set chg curr\n");
break;
case MAXIM_RET_NOACTION:
default:
/* Do nothing..*/
break;
}
}
static int abx500_chargalg_get_ext_psy_data(struct device *dev, void *data)
{
struct power_supply *psy;
struct power_supply *ext;
struct abx500_chargalg *di;
union power_supply_propval ret;
int i, j;
bool psy_found = false;
bool capacity_updated = false;
psy = (struct power_supply *)data;
ext = dev_get_drvdata(dev);
di = power_supply_get_drvdata(psy);
/* For all psy where the driver name appears in any supplied_to */
for (i = 0; i < ext->num_supplicants; i++) {
if (!strcmp(ext->supplied_to[i], psy->desc->name))
psy_found = true;
}
if (!psy_found)
return 0;
/*
* If external is not registering 'POWER_SUPPLY_PROP_CAPACITY' to its
* property because of handling that sysfs entry on its own, this is
* the place to get the battery capacity.
*/
if (!power_supply_get_property(ext, POWER_SUPPLY_PROP_CAPACITY, &ret)) {
di->batt_data.percent = ret.intval;
capacity_updated = true;
}
/* Go through all properties for the psy */
for (j = 0; j < ext->desc->num_properties; j++) {
enum power_supply_property prop;
prop = ext->desc->properties[j];
/*
* Initialize chargers if not already done.
* The ab8500_charger*/
if (!di->ac_chg &&
ext->desc->type == POWER_SUPPLY_TYPE_MAINS)
di->ac_chg = psy_to_ux500_charger(ext);
else if (!di->usb_chg &&
ext->desc->type == POWER_SUPPLY_TYPE_USB)
di->usb_chg = psy_to_ux500_charger(ext);
if (power_supply_get_property(ext, prop, &ret))
continue;
switch (prop) {
case POWER_SUPPLY_PROP_PRESENT:
switch (ext->desc->type) {
case POWER_SUPPLY_TYPE_BATTERY:
/* Battery present */
if (ret.intval)
di->events.batt_rem = false;
/* Battery removed */
else
di->events.batt_rem = true;
break;
case POWER_SUPPLY_TYPE_MAINS:
/* AC disconnected */
if (!ret.intval &&
(di->chg_info.conn_chg & AC_CHG)) {
di->chg_info.prev_conn_chg =
di->chg_info.conn_chg;
di->chg_info.conn_chg &= ~AC_CHG;
}
/* AC connected */
else if (ret.intval &&
!(di->chg_info.conn_chg & AC_CHG)) {
di->chg_info.prev_conn_chg =
di->chg_info.conn_chg;
di->chg_info.conn_chg |= AC_CHG;
}
break;
case POWER_SUPPLY_TYPE_USB:
/* USB disconnected */
if (!ret.intval &&
(di->chg_info.conn_chg & USB_CHG)) {
di->chg_info.prev_conn_chg =
di->chg_info.conn_chg;
di->chg_info.conn_chg &= ~USB_CHG;
}
/* USB connected */
else if (ret.intval &&
!(di->chg_info.conn_chg & USB_CHG)) {
di->chg_info.prev_conn_chg =
di->chg_info.conn_chg;
di->chg_info.conn_chg |= USB_CHG;
}
break;
default:
break;
}
break;
case POWER_SUPPLY_PROP_ONLINE:
switch (ext->desc->type) {
case POWER_SUPPLY_TYPE_BATTERY:
break;
case POWER_SUPPLY_TYPE_MAINS:
/* AC offline */
if (!ret.intval &&
(di->chg_info.online_chg & AC_CHG)) {
di->chg_info.prev_online_chg =
di->chg_info.online_chg;
di->chg_info.online_chg &= ~AC_CHG;
}
/* AC online */
else if (ret.intval &&
!(di->chg_info.online_chg & AC_CHG)) {
di->chg_info.prev_online_chg =
di->chg_info.online_chg;
di->chg_info.online_chg |= AC_CHG;
queue_delayed_work(di->chargalg_wq,
&di->chargalg_wd_work, 0);
}
break;
case POWER_SUPPLY_TYPE_USB:
/* USB offline */
if (!ret.intval &&
(di->chg_info.online_chg & USB_CHG)) {
di->chg_info.prev_online_chg =
di->chg_info.online_chg;
di->chg_info.online_chg &= ~USB_CHG;
}
/* USB online */
else if (ret.intval &&
!(di->chg_info.online_chg & USB_CHG)) {
di->chg_info.prev_online_chg =
di->chg_info.online_chg;
di->chg_info.online_chg |= USB_CHG;
queue_delayed_work(di->chargalg_wq,
&di->chargalg_wd_work, 0);
}
break;
default:
break;
}
break;
case POWER_SUPPLY_PROP_HEALTH:
switch (ext->desc->type) {
case POWER_SUPPLY_TYPE_BATTERY:
break;
case POWER_SUPPLY_TYPE_MAINS:
switch (ret.intval) {
case POWER_SUPPLY_HEALTH_UNSPEC_FAILURE:
di->events.mainextchnotok = true;
di->events.main_thermal_prot = false;
di->events.main_ovv = false;
di->events.ac_wd_expired = false;
break;
case POWER_SUPPLY_HEALTH_DEAD:
di->events.ac_wd_expired = true;
di->events.mainextchnotok = false;
di->events.main_ovv = false;
di->events.main_thermal_prot = false;
break;
case POWER_SUPPLY_HEALTH_COLD:
case POWER_SUPPLY_HEALTH_OVERHEAT:
di->events.main_thermal_prot = true;
di->events.mainextchnotok = false;
di->events.main_ovv = false;
di->events.ac_wd_expired = false;
break;
case POWER_SUPPLY_HEALTH_OVERVOLTAGE:
di->events.main_ovv = true;
di->events.mainextchnotok = false;
di->events.main_thermal_prot = false;
di->events.ac_wd_expired = false;
break;
case POWER_SUPPLY_HEALTH_GOOD:
di->events.main_thermal_prot = false;
di->events.mainextchnotok = false;
di->events.main_ovv = false;
di->events.ac_wd_expired = false;
break;
default:
break;
}
break;
case POWER_SUPPLY_TYPE_USB:
switch (ret.intval) {
case POWER_SUPPLY_HEALTH_UNSPEC_FAILURE:
di->events.usbchargernotok = true;
di->events.usb_thermal_prot = false;
di->events.vbus_ovv = false;
di->events.usb_wd_expired = false;
break;
case POWER_SUPPLY_HEALTH_DEAD:
di->events.usb_wd_expired = true;
di->events.usbchargernotok = false;
di->events.usb_thermal_prot = false;
di->events.vbus_ovv = false;
break;
case POWER_SUPPLY_HEALTH_COLD:
case POWER_SUPPLY_HEALTH_OVERHEAT:
di->events.usb_thermal_prot = true;
di->events.usbchargernotok = false;
di->events.vbus_ovv = false;
di->events.usb_wd_expired = false;
break;
case POWER_SUPPLY_HEALTH_OVERVOLTAGE:
di->events.vbus_ovv = true;
di->events.usbchargernotok = false;
di->events.usb_thermal_prot = false;
di->events.usb_wd_expired = false;
break;
case POWER_SUPPLY_HEALTH_GOOD:
di->events.usbchargernotok = false;
di->events.usb_thermal_prot = false;
di->events.vbus_ovv = false;
di->events.usb_wd_expired = false;
break;
default:
break;
}
default:
break;
}
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
switch (ext->desc->type) {
case POWER_SUPPLY_TYPE_BATTERY:
di->batt_data.volt = ret.intval / 1000;
break;
case POWER_SUPPLY_TYPE_MAINS:
di->chg_info.ac_volt = ret.intval / 1000;
break;
case POWER_SUPPLY_TYPE_USB:
di->chg_info.usb_volt = ret.intval / 1000;
break;
default:
break;
}
break;
case POWER_SUPPLY_PROP_VOLTAGE_AVG:
switch (ext->desc->type) {
case POWER_SUPPLY_TYPE_MAINS:
/* AVG is used to indicate when we are
* in CV mode */
if (ret.intval)
di->events.ac_cv_active = true;
else
di->events.ac_cv_active = false;
break;
case POWER_SUPPLY_TYPE_USB:
/* AVG is used to indicate when we are
* in CV mode */
if (ret.intval)
di->events.usb_cv_active = true;
else
di->events.usb_cv_active = false;
break;
default:
break;
}
break;
case POWER_SUPPLY_PROP_TECHNOLOGY:
switch (ext->desc->type) {
case POWER_SUPPLY_TYPE_BATTERY:
if (ret.intval)
di->events.batt_unknown = false;
else
di->events.batt_unknown = true;
break;
default:
break;
}
break;
case POWER_SUPPLY_PROP_TEMP:
di->batt_data.temp = ret.intval / 10;
break;
case POWER_SUPPLY_PROP_CURRENT_NOW:
switch (ext->desc->type) {
case POWER_SUPPLY_TYPE_MAINS:
di->chg_info.ac_curr =
ret.intval / 1000;
break;
case POWER_SUPPLY_TYPE_USB:
di->chg_info.usb_curr =
ret.intval / 1000;
break;
case POWER_SUPPLY_TYPE_BATTERY:
di->batt_data.inst_curr = ret.intval / 1000;
break;
default:
break;
}
break;
case POWER_SUPPLY_PROP_CURRENT_AVG:
switch (ext->desc->type) {
case POWER_SUPPLY_TYPE_BATTERY:
di->batt_data.avg_curr = ret.intval / 1000;
break;
case POWER_SUPPLY_TYPE_USB:
if (ret.intval)
di->events.vbus_collapsed = true;
else
di->events.vbus_collapsed = false;
break;
default:
break;
}
break;
case POWER_SUPPLY_PROP_CAPACITY:
if (!capacity_updated)
di->batt_data.percent = ret.intval;
break;
default:
break;
}
}
return 0;
}
/**
* abx500_chargalg_external_power_changed() - callback for power supply changes
* @psy: pointer to the structure power_supply
*
* This function is the entry point of the pointer external_power_changed
* of the structure power_supply.
* This function gets executed when there is a change in any external power
* supply that this driver needs to be notified of.
*/
static void abx500_chargalg_external_power_changed(struct power_supply *psy)
{
struct abx500_chargalg *di = power_supply_get_drvdata(psy);
/*
* Trigger execution of the algorithm instantly and read
* all power_supply properties there instead
*/
queue_work(di->chargalg_wq, &di->chargalg_work);
}
/**
* abx500_chargalg_algorithm() - Main function for the algorithm
* @di: pointer to the abx500_chargalg structure
*
* This is the main control function for the charging algorithm.
* It is called periodically or when something happens that will
* trigger a state change
*/
static void abx500_chargalg_algorithm(struct abx500_chargalg *di)
{
int charger_status;
int ret;
int curr_step_lvl;
/* Collect data from all power_supply class devices */
class_for_each_device(power_supply_class, NULL,
di->chargalg_psy, abx500_chargalg_get_ext_psy_data);
abx500_chargalg_end_of_charge(di);
abx500_chargalg_check_temp(di);
abx500_chargalg_check_charger_voltage(di);
charger_status = abx500_chargalg_check_charger_connection(di);
abx500_chargalg_check_current_step_status(di);
if (is_ab8500(di->parent)) {
ret = abx500_chargalg_check_charger_enable(di);
if (ret < 0)
dev_err(di->dev, "Checking charger is enabled error"
": Returned Value %d\n", ret);
}
/*
* First check if we have a charger connected.
* Also we don't allow charging of unknown batteries if configured
* this way
*/
if (!charger_status ||
(di->events.batt_unknown && !di->bm->chg_unknown_bat)) {
if (di->charge_state != STATE_HANDHELD) {
di->events.safety_timer_expired = false;
abx500_chargalg_state_to(di, STATE_HANDHELD_INIT);
}
}
/* If suspended, we should not continue checking the flags */
else if (di->charge_state == STATE_SUSPENDED_INIT ||
di->charge_state == STATE_SUSPENDED) {
/* We don't do anything here, just don,t continue */
}
/* Safety timer expiration */
else if (di->events.safety_timer_expired) {
if (di->charge_state != STATE_SAFETY_TIMER_EXPIRED)
abx500_chargalg_state_to(di,
STATE_SAFETY_TIMER_EXPIRED_INIT);
}
/*
* Check if any interrupts has occured
* that will prevent us from charging
*/
/* Battery removed */
else if (di->events.batt_rem) {
if (di->charge_state != STATE_BATT_REMOVED)
abx500_chargalg_state_to(di, STATE_BATT_REMOVED_INIT);
}
/* Main or USB charger not ok. */
else if (di->events.mainextchnotok || di->events.usbchargernotok) {
/*
* If vbus_collapsed is set, we have to lower the charger
* current, which is done in the normal state below
*/
if (di->charge_state != STATE_CHG_NOT_OK &&
!di->events.vbus_collapsed)
abx500_chargalg_state_to(di, STATE_CHG_NOT_OK_INIT);
}
/* VBUS, Main or VBAT OVV. */
else if (di->events.vbus_ovv ||
di->events.main_ovv ||
di->events.batt_ovv ||
!di->chg_info.usb_chg_ok ||
!di->chg_info.ac_chg_ok) {
if (di->charge_state != STATE_OVV_PROTECT)
abx500_chargalg_state_to(di, STATE_OVV_PROTECT_INIT);
}
/* USB Thermal, stop charging */
else if (di->events.main_thermal_prot ||
di->events.usb_thermal_prot) {
if (di->charge_state != STATE_HW_TEMP_PROTECT)
abx500_chargalg_state_to(di,
STATE_HW_TEMP_PROTECT_INIT);
}
/* Battery temp over/under */
else if (di->events.btemp_underover) {
if (di->charge_state != STATE_TEMP_UNDEROVER)
abx500_chargalg_state_to(di,
STATE_TEMP_UNDEROVER_INIT);
}
/* Watchdog expired */
else if (di->events.ac_wd_expired ||
di->events.usb_wd_expired) {
if (di->charge_state != STATE_WD_EXPIRED)
abx500_chargalg_state_to(di, STATE_WD_EXPIRED_INIT);
}
/* Battery temp high/low */
else if (di->events.btemp_lowhigh) {
if (di->charge_state != STATE_TEMP_LOWHIGH)
abx500_chargalg_state_to(di, STATE_TEMP_LOWHIGH_INIT);
}
dev_dbg(di->dev,
"[CHARGALG] Vb %d Ib_avg %d Ib_inst %d Tb %d Cap %d Maint %d "
"State %s Active_chg %d Chg_status %d AC %d USB %d "
"AC_online %d USB_online %d AC_CV %d USB_CV %d AC_I %d "
"USB_I %d AC_Vset %d AC_Iset %d USB_Vset %d USB_Iset %d\n",
di->batt_data.volt,
di->batt_data.avg_curr,
di->batt_data.inst_curr,
di->batt_data.temp,
di->batt_data.percent,
di->maintenance_chg,
states[di->charge_state],
di->chg_info.charger_type,
di->charge_status,
di->chg_info.conn_chg & AC_CHG,
di->chg_info.conn_chg & USB_CHG,
di->chg_info.online_chg & AC_CHG,
di->chg_info.online_chg & USB_CHG,
di->events.ac_cv_active,
di->events.usb_cv_active,
di->chg_info.ac_curr,
di->chg_info.usb_curr,
di->chg_info.ac_vset,
di->chg_info.ac_iset,
di->chg_info.usb_vset,
di->chg_info.usb_iset);
switch (di->charge_state) {
case STATE_HANDHELD_INIT:
abx500_chargalg_stop_charging(di);
di->charge_status = POWER_SUPPLY_STATUS_DISCHARGING;
abx500_chargalg_state_to(di, STATE_HANDHELD);
/* Intentional fallthrough */
case STATE_HANDHELD:
break;
case STATE_SUSPENDED_INIT:
if (di->susp_status.ac_suspended)
abx500_chargalg_ac_en(di, false, 0, 0);
if (di->susp_status.usb_suspended)
abx500_chargalg_usb_en(di, false, 0, 0);
abx500_chargalg_stop_safety_timer(di);
abx500_chargalg_stop_maintenance_timer(di);
di->charge_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
di->maintenance_chg = false;
abx500_chargalg_state_to(di, STATE_SUSPENDED);
power_supply_changed(di->chargalg_psy);
/* Intentional fallthrough */
case STATE_SUSPENDED:
/* CHARGING is suspended */
break;
case STATE_BATT_REMOVED_INIT:
abx500_chargalg_stop_charging(di);
abx500_chargalg_state_to(di, STATE_BATT_REMOVED);
/* Intentional fallthrough */
case STATE_BATT_REMOVED:
if (!di->events.batt_rem)
abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
break;
case STATE_HW_TEMP_PROTECT_INIT:
abx500_chargalg_stop_charging(di);
abx500_chargalg_state_to(di, STATE_HW_TEMP_PROTECT);
/* Intentional fallthrough */
case STATE_HW_TEMP_PROTECT:
if (!di->events.main_thermal_prot &&
!di->events.usb_thermal_prot)
abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
break;
case STATE_OVV_PROTECT_INIT:
abx500_chargalg_stop_charging(di);
abx500_chargalg_state_to(di, STATE_OVV_PROTECT);
/* Intentional fallthrough */
case STATE_OVV_PROTECT:
if (!di->events.vbus_ovv &&
!di->events.main_ovv &&
!di->events.batt_ovv &&
di->chg_info.usb_chg_ok &&
di->chg_info.ac_chg_ok)
abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
break;
case STATE_CHG_NOT_OK_INIT:
abx500_chargalg_stop_charging(di);
abx500_chargalg_state_to(di, STATE_CHG_NOT_OK);
/* Intentional fallthrough */
case STATE_CHG_NOT_OK:
if (!di->events.mainextchnotok &&
!di->events.usbchargernotok)
abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
break;
case STATE_SAFETY_TIMER_EXPIRED_INIT:
abx500_chargalg_stop_charging(di);
abx500_chargalg_state_to(di, STATE_SAFETY_TIMER_EXPIRED);
/* Intentional fallthrough */
case STATE_SAFETY_TIMER_EXPIRED:
/* We exit this state when charger is removed */
break;
case STATE_NORMAL_INIT:
if ((di->chg_info.charger_type & USB_CHG) &&
di->usb_chg->power_path) {
if (di->batt_data.volt >
(di->bm->fg_params->lowbat_threshold +
BAT_PLUS_MARGIN)) {
ab8540_chargalg_usb_pre_chg_en(di, false);
ab8540_chargalg_usb_pp_en(di, false);
} else {
ab8540_chargalg_usb_pp_en(di, true);
ab8540_chargalg_usb_pre_chg_en(di, true);
abx500_chargalg_state_to(di,
STATE_USB_PP_PRE_CHARGE);
break;
}
}
if (di->curr_status.curr_step == CHARGALG_CURR_STEP_LOW)
abx500_chargalg_stop_charging(di);
else {
curr_step_lvl = di->bm->bat_type[
di->bm->batt_id].normal_cur_lvl
* di->curr_status.curr_step
/ CHARGALG_CURR_STEP_HIGH;
abx500_chargalg_start_charging(di,
di->bm->bat_type[di->bm->batt_id]
.normal_vol_lvl, curr_step_lvl);
}
abx500_chargalg_state_to(di, STATE_NORMAL);
abx500_chargalg_start_safety_timer(di);
abx500_chargalg_stop_maintenance_timer(di);
init_maxim_chg_curr(di);
di->charge_status = POWER_SUPPLY_STATUS_CHARGING;
di->eoc_cnt = 0;
di->maintenance_chg = false;
power_supply_changed(di->chargalg_psy);
break;
case STATE_USB_PP_PRE_CHARGE:
if (di->batt_data.volt >
(di->bm->fg_params->lowbat_threshold +
BAT_PLUS_MARGIN))
abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
break;
case STATE_NORMAL:
handle_maxim_chg_curr(di);
if (di->charge_status == POWER_SUPPLY_STATUS_FULL &&
di->maintenance_chg) {
if (di->bm->no_maintenance)
abx500_chargalg_state_to(di,
STATE_WAIT_FOR_RECHARGE_INIT);
else
abx500_chargalg_state_to(di,
STATE_MAINTENANCE_A_INIT);
}
break;
/* This state will be used when the maintenance state is disabled */
case STATE_WAIT_FOR_RECHARGE_INIT:
abx500_chargalg_hold_charging(di);
abx500_chargalg_state_to(di, STATE_WAIT_FOR_RECHARGE);
/* Intentional fallthrough */
case STATE_WAIT_FOR_RECHARGE:
if (di->batt_data.percent <=
di->bm->bat_type[di->bm->batt_id].
recharge_cap)
abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
break;
case STATE_MAINTENANCE_A_INIT:
abx500_chargalg_stop_safety_timer(di);
abx500_chargalg_start_maintenance_timer(di,
di->bm->bat_type[
di->bm->batt_id].maint_a_chg_timer_h);
abx500_chargalg_start_charging(di,
di->bm->bat_type[
di->bm->batt_id].maint_a_vol_lvl,
di->bm->bat_type[
di->bm->batt_id].maint_a_cur_lvl);
abx500_chargalg_state_to(di, STATE_MAINTENANCE_A);
power_supply_changed(di->chargalg_psy);
/* Intentional fallthrough*/
case STATE_MAINTENANCE_A:
if (di->events.maintenance_timer_expired) {
abx500_chargalg_stop_maintenance_timer(di);
abx500_chargalg_state_to(di, STATE_MAINTENANCE_B_INIT);
}
break;
case STATE_MAINTENANCE_B_INIT:
abx500_chargalg_start_maintenance_timer(di,
di->bm->bat_type[
di->bm->batt_id].maint_b_chg_timer_h);
abx500_chargalg_start_charging(di,
di->bm->bat_type[
di->bm->batt_id].maint_b_vol_lvl,
di->bm->bat_type[
di->bm->batt_id].maint_b_cur_lvl);
abx500_chargalg_state_to(di, STATE_MAINTENANCE_B);
power_supply_changed(di->chargalg_psy);
/* Intentional fallthrough*/
case STATE_MAINTENANCE_B:
if (di->events.maintenance_timer_expired) {
abx500_chargalg_stop_maintenance_timer(di);
abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
}
break;
case STATE_TEMP_LOWHIGH_INIT:
abx500_chargalg_start_charging(di,
di->bm->bat_type[
di->bm->batt_id].low_high_vol_lvl,
di->bm->bat_type[
di->bm->batt_id].low_high_cur_lvl);
abx500_chargalg_stop_maintenance_timer(di);
di->charge_status = POWER_SUPPLY_STATUS_CHARGING;
abx500_chargalg_state_to(di, STATE_TEMP_LOWHIGH);
power_supply_changed(di->chargalg_psy);
/* Intentional fallthrough */
case STATE_TEMP_LOWHIGH:
if (!di->events.btemp_lowhigh)
abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
break;
case STATE_WD_EXPIRED_INIT:
abx500_chargalg_stop_charging(di);
abx500_chargalg_state_to(di, STATE_WD_EXPIRED);
/* Intentional fallthrough */
case STATE_WD_EXPIRED:
if (!di->events.ac_wd_expired &&
!di->events.usb_wd_expired)
abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
break;
case STATE_TEMP_UNDEROVER_INIT:
abx500_chargalg_stop_charging(di);
abx500_chargalg_state_to(di, STATE_TEMP_UNDEROVER);
/* Intentional fallthrough */
case STATE_TEMP_UNDEROVER:
if (!di->events.btemp_underover)
abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
break;
}
/* Start charging directly if the new state is a charge state */
if (di->charge_state == STATE_NORMAL_INIT ||
di->charge_state == STATE_MAINTENANCE_A_INIT ||
di->charge_state == STATE_MAINTENANCE_B_INIT)
queue_work(di->chargalg_wq, &di->chargalg_work);
}
/**
* abx500_chargalg_periodic_work() - Periodic work for the algorithm
* @work: pointer to the work_struct structure
*
* Work queue function for the charging algorithm
*/
static void abx500_chargalg_periodic_work(struct work_struct *work)
{
struct abx500_chargalg *di = container_of(work,
struct abx500_chargalg, chargalg_periodic_work.work);
abx500_chargalg_algorithm(di);
/*
* If a charger is connected then the battery has to be monitored
* frequently, else the work can be delayed.
*/
if (di->chg_info.conn_chg)
queue_delayed_work(di->chargalg_wq,
&di->chargalg_periodic_work,
di->bm->interval_charging * HZ);
else
queue_delayed_work(di->chargalg_wq,
&di->chargalg_periodic_work,
di->bm->interval_not_charging * HZ);
}
/**
* abx500_chargalg_wd_work() - periodic work to kick the charger watchdog
* @work: pointer to the work_struct structure
*
* Work queue function for kicking the charger watchdog
*/
static void abx500_chargalg_wd_work(struct work_struct *work)
{
int ret;
struct abx500_chargalg *di = container_of(work,
struct abx500_chargalg, chargalg_wd_work.work);
dev_dbg(di->dev, "abx500_chargalg_wd_work\n");
ret = abx500_chargalg_kick_watchdog(di);
if (ret < 0)
dev_err(di->dev, "failed to kick watchdog\n");
queue_delayed_work(di->chargalg_wq,
&di->chargalg_wd_work, CHG_WD_INTERVAL);
}
/**
* abx500_chargalg_work() - Work to run the charging algorithm instantly
* @work: pointer to the work_struct structure
*
* Work queue function for calling the charging algorithm
*/
static void abx500_chargalg_work(struct work_struct *work)
{
struct abx500_chargalg *di = container_of(work,
struct abx500_chargalg, chargalg_work);
abx500_chargalg_algorithm(di);
}
/**
* abx500_chargalg_get_property() - get the chargalg properties
* @psy: pointer to the power_supply structure
* @psp: pointer to the power_supply_property structure
* @val: pointer to the power_supply_propval union
*
* This function gets called when an application tries to get the
* chargalg properties by reading the sysfs files.
* status: charging/discharging/full/unknown
* health: health of the battery
* Returns error code in case of failure else 0 on success
*/
static int abx500_chargalg_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct abx500_chargalg *di = power_supply_get_drvdata(psy);
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
val->intval = di->charge_status;
break;
case POWER_SUPPLY_PROP_HEALTH:
if (di->events.batt_ovv) {
val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
} else if (di->events.btemp_underover) {
if (di->batt_data.temp <= di->bm->temp_under)
val->intval = POWER_SUPPLY_HEALTH_COLD;
else
val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
} else if (di->charge_state == STATE_SAFETY_TIMER_EXPIRED ||
di->charge_state == STATE_SAFETY_TIMER_EXPIRED_INIT) {
val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
} else {
val->intval = POWER_SUPPLY_HEALTH_GOOD;
}
break;
default:
return -EINVAL;
}
return 0;
}
/* Exposure to the sysfs interface */
static ssize_t abx500_chargalg_curr_step_show(struct abx500_chargalg *di,
char *buf)
{
return sprintf(buf, "%d\n", di->curr_status.curr_step);
}
static ssize_t abx500_chargalg_curr_step_store(struct abx500_chargalg *di,
const char *buf, size_t length)
{
long int param;
int ret;
ret = kstrtol(buf, 10, &param);
if (ret < 0)
return ret;
di->curr_status.curr_step = param;
if (di->curr_status.curr_step >= CHARGALG_CURR_STEP_LOW &&
di->curr_status.curr_step <= CHARGALG_CURR_STEP_HIGH) {
di->curr_status.curr_step_change = true;
queue_work(di->chargalg_wq, &di->chargalg_work);
} else
dev_info(di->dev, "Wrong current step\n"
"Enter 0. Disable AC/USB Charging\n"
"1--100. Set AC/USB charging current step\n"
"100. Enable AC/USB Charging\n");
return strlen(buf);
}
static ssize_t abx500_chargalg_en_show(struct abx500_chargalg *di,
char *buf)
{
return sprintf(buf, "%d\n",
di->susp_status.ac_suspended &&
di->susp_status.usb_suspended);
}
static ssize_t abx500_chargalg_en_store(struct abx500_chargalg *di,
const char *buf, size_t length)
{
long int param;
int ac_usb;
int ret;
ret = kstrtol(buf, 10, &param);
if (ret < 0)
return ret;
ac_usb = param;
switch (ac_usb) {
case 0:
/* Disable charging */
di->susp_status.ac_suspended = true;
di->susp_status.usb_suspended = true;
di->susp_status.suspended_change = true;
/* Trigger a state change */
queue_work(di->chargalg_wq,
&di->chargalg_work);
break;
case 1:
/* Enable AC Charging */
di->susp_status.ac_suspended = false;
di->susp_status.suspended_change = true;
/* Trigger a state change */
queue_work(di->chargalg_wq,
&di->chargalg_work);
break;
case 2:
/* Enable USB charging */
di->susp_status.usb_suspended = false;
di->susp_status.suspended_change = true;
/* Trigger a state change */
queue_work(di->chargalg_wq,
&di->chargalg_work);
break;
default:
dev_info(di->dev, "Wrong input\n"
"Enter 0. Disable AC/USB Charging\n"
"1. Enable AC charging\n"
"2. Enable USB Charging\n");
};
return strlen(buf);
}
static struct abx500_chargalg_sysfs_entry abx500_chargalg_en_charger =
__ATTR(chargalg, 0644, abx500_chargalg_en_show,
abx500_chargalg_en_store);
static struct abx500_chargalg_sysfs_entry abx500_chargalg_curr_step =
__ATTR(chargalg_curr_step, 0644, abx500_chargalg_curr_step_show,
abx500_chargalg_curr_step_store);
static ssize_t abx500_chargalg_sysfs_show(struct kobject *kobj,
struct attribute *attr, char *buf)
{
struct abx500_chargalg_sysfs_entry *entry = container_of(attr,
struct abx500_chargalg_sysfs_entry, attr);
struct abx500_chargalg *di = container_of(kobj,
struct abx500_chargalg, chargalg_kobject);
if (!entry->show)
return -EIO;
return entry->show(di, buf);
}
static ssize_t abx500_chargalg_sysfs_charger(struct kobject *kobj,
struct attribute *attr, const char *buf, size_t length)
{
struct abx500_chargalg_sysfs_entry *entry = container_of(attr,
struct abx500_chargalg_sysfs_entry, attr);
struct abx500_chargalg *di = container_of(kobj,
struct abx500_chargalg, chargalg_kobject);
if (!entry->store)
return -EIO;
return entry->store(di, buf, length);
}
static struct attribute *abx500_chargalg_chg[] = {
&abx500_chargalg_en_charger.attr,
&abx500_chargalg_curr_step.attr,
NULL,
};
static const struct sysfs_ops abx500_chargalg_sysfs_ops = {
.show = abx500_chargalg_sysfs_show,
.store = abx500_chargalg_sysfs_charger,
};
static struct kobj_type abx500_chargalg_ktype = {
.sysfs_ops = &abx500_chargalg_sysfs_ops,
.default_attrs = abx500_chargalg_chg,
};
/**
* abx500_chargalg_sysfs_exit() - de-init of sysfs entry
* @di: pointer to the struct abx500_chargalg
*
* This function removes the entry in sysfs.
*/
static void abx500_chargalg_sysfs_exit(struct abx500_chargalg *di)
{
kobject_del(&di->chargalg_kobject);
}
/**
* abx500_chargalg_sysfs_init() - init of sysfs entry
* @di: pointer to the struct abx500_chargalg
*
* This function adds an entry in sysfs.
* Returns error code in case of failure else 0(on success)
*/
static int abx500_chargalg_sysfs_init(struct abx500_chargalg *di)
{
int ret = 0;
ret = kobject_init_and_add(&di->chargalg_kobject,
&abx500_chargalg_ktype,
NULL, "abx500_chargalg");
if (ret < 0)
dev_err(di->dev, "failed to create sysfs entry\n");
return ret;
}
/* Exposure to the sysfs interface <<END>> */
#if defined(CONFIG_PM)
static int abx500_chargalg_resume(struct platform_device *pdev)
{
struct abx500_chargalg *di = platform_get_drvdata(pdev);
/* Kick charger watchdog if charging (any charger online) */
if (di->chg_info.online_chg)
queue_delayed_work(di->chargalg_wq, &di->chargalg_wd_work, 0);
/*
* Run the charging algorithm directly to be sure we don't
* do it too seldom
*/
queue_delayed_work(di->chargalg_wq, &di->chargalg_periodic_work, 0);
return 0;
}
static int abx500_chargalg_suspend(struct platform_device *pdev,
pm_message_t state)
{
struct abx500_chargalg *di = platform_get_drvdata(pdev);
if (di->chg_info.online_chg)
cancel_delayed_work_sync(&di->chargalg_wd_work);
cancel_delayed_work_sync(&di->chargalg_periodic_work);
return 0;
}
#else
#define abx500_chargalg_suspend NULL
#define abx500_chargalg_resume NULL
#endif
static int abx500_chargalg_remove(struct platform_device *pdev)
{
struct abx500_chargalg *di = platform_get_drvdata(pdev);
/* sysfs interface to enable/disbale charging from user space */
abx500_chargalg_sysfs_exit(di);
hrtimer_cancel(&di->safety_timer);
hrtimer_cancel(&di->maintenance_timer);
cancel_delayed_work_sync(&di->chargalg_periodic_work);
cancel_delayed_work_sync(&di->chargalg_wd_work);
cancel_work_sync(&di->chargalg_work);
/* Delete the work queue */
destroy_workqueue(di->chargalg_wq);
power_supply_unregister(di->chargalg_psy);
return 0;
}
static char *supply_interface[] = {
"ab8500_fg",
};
static const struct power_supply_desc abx500_chargalg_desc = {
.name = "abx500_chargalg",
.type = POWER_SUPPLY_TYPE_BATTERY,
.properties = abx500_chargalg_props,
.num_properties = ARRAY_SIZE(abx500_chargalg_props),
.get_property = abx500_chargalg_get_property,
.external_power_changed = abx500_chargalg_external_power_changed,
};
static int abx500_chargalg_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct abx500_bm_data *plat = pdev->dev.platform_data;
struct power_supply_config psy_cfg = {};
struct abx500_chargalg *di;
int ret = 0;
di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
if (!di) {
dev_err(&pdev->dev, "%s no mem for ab8500_chargalg\n", __func__);
return -ENOMEM;
}
if (!plat) {
dev_err(&pdev->dev, "no battery management data supplied\n");
return -EINVAL;
}
di->bm = plat;
if (np) {
ret = ab8500_bm_of_probe(&pdev->dev, np, di->bm);
if (ret) {
dev_err(&pdev->dev, "failed to get battery information\n");
return ret;
}
}
/* get device struct and parent */
di->dev = &pdev->dev;
di->parent = dev_get_drvdata(pdev->dev.parent);
psy_cfg.supplied_to = supply_interface;
psy_cfg.num_supplicants = ARRAY_SIZE(supply_interface);
psy_cfg.drv_data = di;
/* Initilialize safety timer */
hrtimer_init(&di->safety_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
di->safety_timer.function = abx500_chargalg_safety_timer_expired;
/* Initilialize maintenance timer */
hrtimer_init(&di->maintenance_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
di->maintenance_timer.function =
abx500_chargalg_maintenance_timer_expired;
/* Create a work queue for the chargalg */
di->chargalg_wq =
create_singlethread_workqueue("abx500_chargalg_wq");
if (di->chargalg_wq == NULL) {
dev_err(di->dev, "failed to create work queue\n");
return -ENOMEM;
}
/* Init work for chargalg */
INIT_DEFERRABLE_WORK(&di->chargalg_periodic_work,
abx500_chargalg_periodic_work);
INIT_DEFERRABLE_WORK(&di->chargalg_wd_work,
abx500_chargalg_wd_work);
/* Init work for chargalg */
INIT_WORK(&di->chargalg_work, abx500_chargalg_work);
/* To detect charger at startup */
di->chg_info.prev_conn_chg = -1;
/* Register chargalg power supply class */
di->chargalg_psy = power_supply_register(di->dev, &abx500_chargalg_desc,
&psy_cfg);
if (IS_ERR(di->chargalg_psy)) {
dev_err(di->dev, "failed to register chargalg psy\n");
ret = PTR_ERR(di->chargalg_psy);
goto free_chargalg_wq;
}
platform_set_drvdata(pdev, di);
/* sysfs interface to enable/disable charging from user space */
ret = abx500_chargalg_sysfs_init(di);
if (ret) {
dev_err(di->dev, "failed to create sysfs entry\n");
goto free_psy;
}
di->curr_status.curr_step = CHARGALG_CURR_STEP_HIGH;
/* Run the charging algorithm */
queue_delayed_work(di->chargalg_wq, &di->chargalg_periodic_work, 0);
dev_info(di->dev, "probe success\n");
return ret;
free_psy:
power_supply_unregister(di->chargalg_psy);
free_chargalg_wq:
destroy_workqueue(di->chargalg_wq);
return ret;
}
static const struct of_device_id ab8500_chargalg_match[] = {
{ .compatible = "stericsson,ab8500-chargalg", },
{ },
};
static struct platform_driver abx500_chargalg_driver = {
.probe = abx500_chargalg_probe,
.remove = abx500_chargalg_remove,
.suspend = abx500_chargalg_suspend,
.resume = abx500_chargalg_resume,
.driver = {
.name = "ab8500-chargalg",
.of_match_table = ab8500_chargalg_match,
},
};
module_platform_driver(abx500_chargalg_driver);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Johan Palsson, Karl Komierowski");
MODULE_ALIAS("platform:abx500-chargalg");
MODULE_DESCRIPTION("abx500 battery charging algorithm");
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