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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
#define to_abx500_chargalg_device_info(x) container_of((x), \
struct abx500_chargalg, chargalg_psy);
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 = to_abx500_chargalg_device_info(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->name))
psy_found = true;
}
if (!psy_found)
return 0;
/*
* If external is not registering 'POWER_SUPPLY_PROP_CAPACITY' to its