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linux/drivers/power/supply/ab8500_chargalg.c
Linus Walleij 25fd330370 power: supply_core: Pass pointer to battery info 
The function to retrieve battery info (from the device tree) assumes
we have a static info struct that gets populated by calling into
power_supply_get_battery_info().

This is awkward since I want to support tables of static battery
info by just assigning a pointer to all info based on e.g. a
compatible value in the device tree.

We also have a mixture of static and dynamically allocated
variables here.

Bite the bullet and let power_supply_get_battery_info() allocate
also the memory used for the very top level
struct power_supply_battery_info container. Pass pointers
around and lifecycle this with the psy device just like the
stuff we allocate inside it.

Change all current users over.

As part of the change, initializers need to be added to some
previously uninitialized fields in struct
power_supply_battery_info.

Reviewed-By: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
2022-01-03 18:53:10 +01:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) ST-Ericsson SA 2012
* Copyright (c) 2012 Sony Mobile Communications AB
*
* Charging algorithm driver for AB8500
*
* 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/component.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/notifier.h>
#include "ab8500-bm.h"
#include "ab8500-chargalg.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
#define CHARGALG_CURR_STEP_LOW_UA 0
#define CHARGALG_CURR_STEP_HIGH_UA 100000
/*
* This is the battery capacity limit that will trigger a new
* full charging cycle in the case where maintenance charging
* has been disabled
*/
#define AB8500_RECHARGE_CAP 95
enum ab8500_chargers {
NO_CHG,
AC_CHG,
USB_CHG,
};
struct ab8500_chargalg_charger_info {
enum ab8500_chargers conn_chg;
enum ab8500_chargers prev_conn_chg;
enum ab8500_chargers online_chg;
enum ab8500_chargers prev_online_chg;
enum ab8500_chargers charger_type;
bool usb_chg_ok;
bool ac_chg_ok;
int usb_volt_uv;
int usb_curr_ua;
int ac_volt_uv;
int ac_curr_ua;
int usb_vset_uv;
int usb_iset_ua;
int ac_vset_uv;
int ac_iset_ua;
};
struct ab8500_chargalg_suspension_status {
bool suspended_change;
bool ac_suspended;
bool usb_suspended;
};
struct ab8500_chargalg_current_step_status {
bool curr_step_change;
int curr_step_ua;
};
struct ab8500_chargalg_battery_data {
int temp;
int volt_uv;
int avg_curr_ua;
int inst_curr_ua;
int percent;
};
enum ab8500_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_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 * const states[] = {
"HANDHELD_INIT",
"HANDHELD",
"CHG_NOT_OK_INIT",
"CHG_NOT_OK",
"HW_TEMP_PROTECT_INIT",
"HW_TEMP_PROTECT",
"NORMAL_INIT",
"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 ab8500_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 ab8500_charge_curr_maximization - Charger maximization parameters
* @original_iset_ua: the non optimized/maximised charger current
* @current_iset_ua: the charging current used at this moment
* @test_delta_i_ua: 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_ua: 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 ab8500_charge_curr_maximization {
int original_iset_ua;
int current_iset_ua;
int test_delta_i_ua;
int condition_cnt;
int max_current_ua;
int wait_cnt;
u8 level;
};
enum maxim_ret {
MAXIM_RET_NOACTION,
MAXIM_RET_CHANGE,
MAXIM_RET_IBAT_TOO_HIGH,
};
/**
* struct ab8500_chargalg - ab8500 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 ab8500
* @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 ab8500_chargalg {
struct device *dev;
int charge_status;
int eoc_cnt;
bool maintenance_chg;
int t_hyst_norm;
int t_hyst_lowhigh;
enum ab8500_chargalg_states charge_state;
struct ab8500_charge_curr_maximization ccm;
struct ab8500_chargalg_charger_info chg_info;
struct ab8500_chargalg_battery_data batt_data;
struct ab8500_chargalg_suspension_status susp_status;
struct ab8500 *parent;
struct ab8500_chargalg_current_step_status curr_status;
struct ab8500_bm_data *bm;
struct power_supply *chargalg_psy;
struct ux500_charger *ac_chg;
struct ux500_charger *usb_chg;
struct ab8500_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 ab8500_chargalg_props[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_HEALTH,
};
struct ab8500_chargalg_sysfs_entry {
struct attribute attr;
ssize_t (*show)(struct ab8500_chargalg *di, char *buf);
ssize_t (*store)(struct ab8500_chargalg *di, const char *buf, size_t length);
};
/**
* ab8500_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
ab8500_chargalg_safety_timer_expired(struct hrtimer *timer)
{
struct ab8500_chargalg *di = container_of(timer, struct ab8500_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;
}
/**
* ab8500_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
ab8500_chargalg_maintenance_timer_expired(struct hrtimer *timer)
{
struct ab8500_chargalg *di = container_of(timer, struct ab8500_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;
}
/**
* ab8500_chargalg_state_to() - Change charge state
* @di: pointer to the ab8500_chargalg structure
*
* This function gets called when a charge state change should occur
*/
static void ab8500_chargalg_state_to(struct ab8500_chargalg *di,
enum ab8500_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 ab8500_chargalg_check_charger_enable(struct ab8500_chargalg *di)
{
struct power_supply_battery_info *bi = di->bm->bi;
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,
bi->constant_charge_voltage_max_uv,
bi->constant_charge_current_max_ua);
} else if ((di->chg_info.charger_type & AC_CHG) &&
!(di->ac_chg->external)) {
return di->ac_chg->ops.check_enable(di->ac_chg,
bi->constant_charge_voltage_max_uv,
bi->constant_charge_current_max_ua);
}
return 0;
}
/**
* ab8500_chargalg_check_charger_connection() - Check charger connection change
* @di: pointer to the ab8500_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 ab8500_chargalg_check_charger_connection(struct ab8500_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;
ab8500_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;
ab8500_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;
ab8500_chargalg_state_to(di, STATE_SUSPENDED_INIT);
} else {
dev_dbg(di->dev, "Charging source is OFF\n");
di->chg_info.charger_type = NO_CHG;
ab8500_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;
}
/**
* ab8500_chargalg_check_current_step_status() - Check charging current
* step status.
* @di: pointer to the ab8500_chargalg structure
*
* This function will check if there is a change in the charging current step
* and change charge state accordingly.
*/
static void ab8500_chargalg_check_current_step_status
(struct ab8500_chargalg *di)
{
if (di->curr_status.curr_step_change)
ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
di->curr_status.curr_step_change = false;
}
/**
* ab8500_chargalg_start_safety_timer() - Start charging safety timer
* @di: pointer to the ab8500_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 ab8500_chargalg_start_safety_timer(struct ab8500_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);
}
/**
* ab8500_chargalg_stop_safety_timer() - Stop charging safety timer
* @di: pointer to the ab8500_chargalg structure
*
* The safety timer is stopped whenever the NORMAL state is exited
*/
static void ab8500_chargalg_stop_safety_timer(struct ab8500_chargalg *di)
{
if (hrtimer_try_to_cancel(&di->safety_timer) >= 0)
di->events.safety_timer_expired = false;
}
/**
* ab8500_chargalg_start_maintenance_timer() - Start charging maintenance timer
* @di: pointer to the ab8500_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 ab8500_chargalg_start_maintenance_timer(struct ab8500_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);
}
/**
* ab8500_chargalg_stop_maintenance_timer() - Stop maintenance timer
* @di: pointer to the ab8500_chargalg structure
*
* The maintenance timer is stopped whenever maintenance ends or when another
* state is entered
*/
static void ab8500_chargalg_stop_maintenance_timer(struct ab8500_chargalg *di)
{
if (hrtimer_try_to_cancel(&di->maintenance_timer) >= 0)
di->events.maintenance_timer_expired = false;
}
/**
* ab8500_chargalg_kick_watchdog() - Kick charger watchdog
* @di: pointer to the ab8500_chargalg structure
*
* The charger watchdog have to be kicked periodically whenever the charger is
* on, else the ABB will reset the system
*/
static int ab8500_chargalg_kick_watchdog(struct ab8500_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;
}
/**
* ab8500_chargalg_ac_en() - Turn on/off the AC charger
* @di: pointer to the ab8500_chargalg structure
* @enable: charger on/off
* @vset_uv: requested charger output voltage in microvolt
* @iset_ua: requested charger output current in microampere
*
* The AC charger will be turned on/off with the requested charge voltage and
* current
*/
static int ab8500_chargalg_ac_en(struct ab8500_chargalg *di, int enable,
int vset_uv, int iset_ua)
{
static int ab8500_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_uv)
vset_uv = min(vset_uv, di->ac_chg->max_out_volt_uv);
if (di->ac_chg->max_out_curr_ua)
iset_ua = min(iset_ua, di->ac_chg->max_out_curr_ua);
di->chg_info.ac_iset_ua = iset_ua;
di->chg_info.ac_vset_uv = vset_uv;
/* Enable external charger */
if (enable && di->ac_chg->external &&
!ab8500_chargalg_ex_ac_enable_toggle) {
blocking_notifier_call_chain(&charger_notifier_list,
0, di->dev);
ab8500_chargalg_ex_ac_enable_toggle++;
}
return di->ac_chg->ops.enable(di->ac_chg, enable, vset_uv, iset_ua);
}
/**
* ab8500_chargalg_usb_en() - Turn on/off the USB charger
* @di: pointer to the ab8500_chargalg structure
* @enable: charger on/off
* @vset_uv: requested charger output voltage in microvolt
* @iset_ua: requested charger output current in microampere
*
* The USB charger will be turned on/off with the requested charge voltage and
* current
*/
static int ab8500_chargalg_usb_en(struct ab8500_chargalg *di, int enable,
int vset_uv, int iset_ua)
{
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_uv)
vset_uv = min(vset_uv, di->usb_chg->max_out_volt_uv);
if (di->usb_chg->max_out_curr_ua)
iset_ua = min(iset_ua, di->usb_chg->max_out_curr_ua);
di->chg_info.usb_iset_ua = iset_ua;
di->chg_info.usb_vset_uv = vset_uv;
return di->usb_chg->ops.enable(di->usb_chg, enable, vset_uv, iset_ua);
}
/**
* ab8500_chargalg_update_chg_curr() - Update charger current
* @di: pointer to the ab8500_chargalg structure
* @iset_ua: requested charger output current in microampere
*
* The charger output current will be updated for the charger
* that is currently in use
*/
static int ab8500_chargalg_update_chg_curr(struct ab8500_chargalg *di,
int iset_ua)
{
/* 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_ua)
iset_ua = min(iset_ua, di->ac_chg->max_out_curr_ua);
di->chg_info.ac_iset_ua = iset_ua;
return di->ac_chg->ops.update_curr(di->ac_chg, iset_ua);
} 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_ua)
iset_ua = min(iset_ua, di->usb_chg->max_out_curr_ua);
di->chg_info.usb_iset_ua = iset_ua;
return di->usb_chg->ops.update_curr(di->usb_chg, iset_ua);
}
return -ENXIO;
}
/**
* ab8500_chargalg_stop_charging() - Stop charging
* @di: pointer to the ab8500_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 ab8500_chargalg_stop_charging(struct ab8500_chargalg *di)
{
ab8500_chargalg_ac_en(di, false, 0, 0);
ab8500_chargalg_usb_en(di, false, 0, 0);
ab8500_chargalg_stop_safety_timer(di);
ab8500_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);
}
/**
* ab8500_chargalg_hold_charging() - Pauses charging
* @di: pointer to the ab8500_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 ab8500_chargalg_hold_charging(struct ab8500_chargalg *di)
{
ab8500_chargalg_ac_en(di, false, 0, 0);
ab8500_chargalg_usb_en(di, false, 0, 0);
ab8500_chargalg_stop_safety_timer(di);
ab8500_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);
}
/**
* ab8500_chargalg_start_charging() - Start the charger
* @di: pointer to the ab8500_chargalg structure
* @vset_uv: requested charger output voltage in microvolt
* @iset_ua: requested charger output current in microampere
*
* A charger will be enabled depending on the requested charger type that was
* detected previously.
*/
static void ab8500_chargalg_start_charging(struct ab8500_chargalg *di,
int vset_uv, int iset_ua)
{
switch (di->chg_info.charger_type) {
case AC_CHG:
dev_dbg(di->dev,
"AC parameters: Vset %d, Ich %d\n", vset_uv, iset_ua);
ab8500_chargalg_usb_en(di, false, 0, 0);
ab8500_chargalg_ac_en(di, true, vset_uv, iset_ua);
break;
case USB_CHG:
dev_dbg(di->dev,
"USB parameters: Vset %d, Ich %d\n", vset_uv, iset_ua);
ab8500_chargalg_ac_en(di, false, 0, 0);
ab8500_chargalg_usb_en(di, true, vset_uv, iset_ua);
break;
default:
dev_err(di->dev, "Unknown charger to charge from\n");
break;
}
}
/**
* ab8500_chargalg_check_temp() - Check battery temperature ranges
* @di: pointer to the ab8500_chargalg structure
*
* The battery temperature is checked against the predefined limits and the
* charge state is changed accordingly
*/
static void ab8500_chargalg_check_temp(struct ab8500_chargalg *di)
{
struct power_supply_battery_info *bi = di->bm->bi;
if (di->batt_data.temp > (bi->temp_alert_min + di->t_hyst_norm) &&
di->batt_data.temp < (bi->temp_alert_max - 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 >= bi->temp_alert_max) &&
(di->batt_data.temp <
(bi->temp_max - di->t_hyst_lowhigh))) ||
((di->batt_data.temp >
(bi->temp_min + di->t_hyst_lowhigh)) &&
(di->batt_data.temp <= bi->temp_alert_min))) {
/* 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 <= bi->temp_min ||
di->batt_data.temp >= bi->temp_max) {
/* 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);
}
}
}
/**
* ab8500_chargalg_check_charger_voltage() - Check charger voltage
* @di: pointer to the ab8500_chargalg structure
*
* Charger voltage is checked against maximum limit
*/
static void ab8500_chargalg_check_charger_voltage(struct ab8500_chargalg *di)
{
if (di->chg_info.usb_volt_uv > di->bm->chg_params->usb_volt_max_uv)
di->chg_info.usb_chg_ok = false;
else
di->chg_info.usb_chg_ok = true;
if (di->chg_info.ac_volt_uv > di->bm->chg_params->ac_volt_max_uv)
di->chg_info.ac_chg_ok = false;
else
di->chg_info.ac_chg_ok = true;
}
/**
* ab8500_chargalg_end_of_charge() - Check if end-of-charge criteria is fulfilled
* @di: pointer to the ab8500_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 ab8500_chargalg_end_of_charge(struct ab8500_chargalg *di)
{
if (di->charge_status == POWER_SUPPLY_STATUS_CHARGING &&
di->charge_state == STATE_NORMAL &&
!di->maintenance_chg && (di->batt_data.volt_uv >=
di->bm->bi->overvoltage_limit_uv ||
di->events.usb_cv_active || di->events.ac_cv_active) &&
di->batt_data.avg_curr_ua <
di->bm->bi->charge_term_current_ua &&
di->batt_data.avg_curr_ua > 0) {
if (++di->eoc_cnt >= EOC_COND_CNT) {
di->eoc_cnt = 0;
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 ab8500_chargalg *di)
{
struct power_supply_battery_info *bi = di->bm->bi;
di->ccm.original_iset_ua = bi->constant_charge_current_max_ua;
di->ccm.current_iset_ua = bi->constant_charge_current_max_ua;
di->ccm.test_delta_i_ua = di->bm->maxi->charger_curr_step_ua;
di->ccm.max_current_ua = di->bm->maxi->chg_curr_ua;
di->ccm.condition_cnt = di->bm->maxi->wait_cycles;
di->ccm.level = 0;
}
/**
* ab8500_chargalg_chg_curr_maxim - increases the charger current to
* compensate for the system load
* @di pointer to the ab8500_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 ab8500_chargalg_chg_curr_maxim(struct ab8500_chargalg *di)
{
int delta_i_ua;
if (!di->bm->maxi->ena_maxi)
return MAXIM_RET_NOACTION;
delta_i_ua = di->ccm.original_iset_ua - di->batt_data.inst_curr_ua;
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_ua =
di->ccm.current_iset_ua - di->ccm.test_delta_i_ua;
di->ccm.current_iset_ua = di->ccm.max_current_ua;
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_ua > di->ccm.original_iset_ua) {
dev_dbg(di->dev, " Maximization Ibat (%duA) too high"
" (limit %duA) (current iset: %duA)!\n",
di->batt_data.inst_curr_ua, di->ccm.original_iset_ua,
di->ccm.current_iset_ua);
if (di->ccm.current_iset_ua == di->ccm.original_iset_ua)
return MAXIM_RET_NOACTION;
di->ccm.condition_cnt = di->bm->maxi->wait_cycles;
di->ccm.current_iset_ua = di->ccm.original_iset_ua;
di->ccm.level = 0;
return MAXIM_RET_IBAT_TOO_HIGH;
}
if (delta_i_ua > di->ccm.test_delta_i_ua &&
(di->ccm.current_iset_ua + di->ccm.test_delta_i_ua) <
di->ccm.max_current_ua) {
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_ua += di->ccm.test_delta_i_ua;
di->ccm.level++;
dev_dbg(di->dev, " Maximization needed, increase"
" with %d uA to %duA (Optimal ibat: %d uA)"
" Level %d\n",
di->ccm.test_delta_i_ua,
di->ccm.current_iset_ua,
di->ccm.original_iset_ua,
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 ab8500_chargalg *di)
{
struct power_supply_battery_info *bi = di->bm->bi;
enum maxim_ret ret;
int result;
ret = ab8500_chargalg_chg_curr_maxim(di);
switch (ret) {
case MAXIM_RET_CHANGE:
result = ab8500_chargalg_update_chg_curr(di,
di->ccm.current_iset_ua);
if (result)
dev_err(di->dev, "failed to set chg curr\n");
break;
case MAXIM_RET_IBAT_TOO_HIGH:
result = ab8500_chargalg_update_chg_curr(di,
bi->constant_charge_current_max_ua);
if (result)
dev_err(di->dev, "failed to set chg curr\n");
break;
case MAXIM_RET_NOACTION:
default:
/* Do nothing..*/
break;
}
}
static int ab8500_chargalg_get_ext_psy_data(struct device *dev, void *data)
{
struct power_supply *psy;
struct power_supply *ext = dev_get_drvdata(dev);
const char **supplicants = (const char **)ext->supplied_to;
struct ab8500_chargalg *di;
union power_supply_propval ret;
int j;
bool capacity_updated = false;
psy = (struct power_supply *)data;
di = power_supply_get_drvdata(psy);
/* For all psy where the driver name appears in any supplied_to */
j = match_string(supplicants, ext->num_supplicants, psy->desc->name);
if (j < 0)
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;
}
break;
default:
break;
}
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
switch (ext->desc->type) {
case POWER_SUPPLY_TYPE_BATTERY:
di->batt_data.volt_uv = ret.intval;
break;
case POWER_SUPPLY_TYPE_MAINS:
di->chg_info.ac_volt_uv = ret.intval;
break;
case POWER_SUPPLY_TYPE_USB:
di->chg_info.usb_volt_uv = ret.intval;
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_ua = ret.intval;
break;
case POWER_SUPPLY_TYPE_USB:
di->chg_info.usb_curr_ua = ret.intval;
break;
case POWER_SUPPLY_TYPE_BATTERY:
di->batt_data.inst_curr_ua = ret.intval;
break;
default:
break;
}
break;
case POWER_SUPPLY_PROP_CURRENT_AVG:
switch (ext->desc->type) {
case POWER_SUPPLY_TYPE_BATTERY:
di->batt_data.avg_curr_ua = ret.intval;
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;
}
/**
* ab8500_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 ab8500_chargalg_external_power_changed(struct power_supply *psy)
{
struct ab8500_chargalg *di = power_supply_get_drvdata(psy);
/*
* Trigger execution of the algorithm instantly and read
* all power_supply properties there instead
*/
if (di->chargalg_wq)
queue_work(di->chargalg_wq, &di->chargalg_work);
}
/**
* ab8500_chargalg_algorithm() - Main function for the algorithm
* @di: pointer to the ab8500_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 ab8500_chargalg_algorithm(struct ab8500_chargalg *di)
{
struct power_supply_battery_info *bi = di->bm->bi;
int charger_status;
int ret;
int curr_step_lvl_ua;
/* Collect data from all power_supply class devices */
class_for_each_device(power_supply_class, NULL,
di->chargalg_psy, ab8500_chargalg_get_ext_psy_data);
ab8500_chargalg_end_of_charge(di);
ab8500_chargalg_check_temp(di);
ab8500_chargalg_check_charger_voltage(di);
charger_status = ab8500_chargalg_check_charger_connection(di);
ab8500_chargalg_check_current_step_status(di);
if (is_ab8500(di->parent)) {
ret = ab8500_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;
ab8500_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)
ab8500_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)
ab8500_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)
ab8500_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)
ab8500_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)
ab8500_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)
ab8500_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)
ab8500_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)
ab8500_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_uv,
di->batt_data.avg_curr_ua,
di->batt_data.inst_curr_ua,
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_ua,
di->chg_info.usb_curr_ua,
di->chg_info.ac_vset_uv,
di->chg_info.ac_iset_ua,
di->chg_info.usb_vset_uv,
di->chg_info.usb_iset_ua);
switch (di->charge_state) {
case STATE_HANDHELD_INIT:
ab8500_chargalg_stop_charging(di);
di->charge_status = POWER_SUPPLY_STATUS_DISCHARGING;
ab8500_chargalg_state_to(di, STATE_HANDHELD);
fallthrough;
case STATE_HANDHELD:
break;
case STATE_SUSPENDED_INIT:
if (di->susp_status.ac_suspended)
ab8500_chargalg_ac_en(di, false, 0, 0);
if (di->susp_status.usb_suspended)
ab8500_chargalg_usb_en(di, false, 0, 0);
ab8500_chargalg_stop_safety_timer(di);
ab8500_chargalg_stop_maintenance_timer(di);
di->charge_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
di->maintenance_chg = false;
ab8500_chargalg_state_to(di, STATE_SUSPENDED);
power_supply_changed(di->chargalg_psy);
fallthrough;
case STATE_SUSPENDED:
/* CHARGING is suspended */
break;
case STATE_BATT_REMOVED_INIT:
ab8500_chargalg_stop_charging(di);
ab8500_chargalg_state_to(di, STATE_BATT_REMOVED);
fallthrough;
case STATE_BATT_REMOVED:
if (!di->events.batt_rem)
ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
break;
case STATE_HW_TEMP_PROTECT_INIT:
ab8500_chargalg_stop_charging(di);
ab8500_chargalg_state_to(di, STATE_HW_TEMP_PROTECT);
fallthrough;
case STATE_HW_TEMP_PROTECT:
if (!di->events.main_thermal_prot &&
!di->events.usb_thermal_prot)
ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
break;
case STATE_OVV_PROTECT_INIT:
ab8500_chargalg_stop_charging(di);
ab8500_chargalg_state_to(di, STATE_OVV_PROTECT);
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)
ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
break;
case STATE_CHG_NOT_OK_INIT:
ab8500_chargalg_stop_charging(di);
ab8500_chargalg_state_to(di, STATE_CHG_NOT_OK);
fallthrough;
case STATE_CHG_NOT_OK:
if (!di->events.mainextchnotok &&
!di->events.usbchargernotok)
ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
break;
case STATE_SAFETY_TIMER_EXPIRED_INIT:
ab8500_chargalg_stop_charging(di);
ab8500_chargalg_state_to(di, STATE_SAFETY_TIMER_EXPIRED);
fallthrough;
case STATE_SAFETY_TIMER_EXPIRED:
/* We exit this state when charger is removed */
break;
case STATE_NORMAL_INIT:
if (di->curr_status.curr_step_ua == CHARGALG_CURR_STEP_LOW_UA)
ab8500_chargalg_stop_charging(di);
else {
curr_step_lvl_ua = bi->constant_charge_current_max_ua
* di->curr_status.curr_step_ua
/ CHARGALG_CURR_STEP_HIGH_UA;
ab8500_chargalg_start_charging(di,
bi->constant_charge_voltage_max_uv,
curr_step_lvl_ua);
}
ab8500_chargalg_state_to(di, STATE_NORMAL);
ab8500_chargalg_start_safety_timer(di);
ab8500_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_NORMAL:
handle_maxim_chg_curr(di);
if (di->charge_status == POWER_SUPPLY_STATUS_FULL &&
di->maintenance_chg) {
if (di->bm->no_maintenance)
ab8500_chargalg_state_to(di,
STATE_WAIT_FOR_RECHARGE_INIT);
else
ab8500_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:
ab8500_chargalg_hold_charging(di);
ab8500_chargalg_state_to(di, STATE_WAIT_FOR_RECHARGE);
fallthrough;
case STATE_WAIT_FOR_RECHARGE:
if (di->batt_data.percent <= AB8500_RECHARGE_CAP)
ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
break;
case STATE_MAINTENANCE_A_INIT:
ab8500_chargalg_stop_safety_timer(di);
ab8500_chargalg_start_maintenance_timer(di,
di->bm->bat_type->maint_a_chg_timer_h);
ab8500_chargalg_start_charging(di,
di->bm->bat_type->maint_a_vol_lvl,
di->bm->bat_type->maint_a_cur_lvl);
ab8500_chargalg_state_to(di, STATE_MAINTENANCE_A);
power_supply_changed(di->chargalg_psy);
fallthrough;
case STATE_MAINTENANCE_A:
if (di->events.maintenance_timer_expired) {
ab8500_chargalg_stop_maintenance_timer(di);
ab8500_chargalg_state_to(di, STATE_MAINTENANCE_B_INIT);
}
break;
case STATE_MAINTENANCE_B_INIT:
ab8500_chargalg_start_maintenance_timer(di,
di->bm->bat_type->maint_b_chg_timer_h);
ab8500_chargalg_start_charging(di,
di->bm->bat_type->maint_b_vol_lvl,
di->bm->bat_type->maint_b_cur_lvl);
ab8500_chargalg_state_to(di, STATE_MAINTENANCE_B);
power_supply_changed(di->chargalg_psy);
fallthrough;
case STATE_MAINTENANCE_B:
if (di->events.maintenance_timer_expired) {
ab8500_chargalg_stop_maintenance_timer(di);
ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
}
break;
case STATE_TEMP_LOWHIGH_INIT:
ab8500_chargalg_start_charging(di,
di->bm->bat_type->low_high_vol_lvl,
di->bm->bat_type->low_high_cur_lvl);
ab8500_chargalg_stop_maintenance_timer(di);
di->charge_status = POWER_SUPPLY_STATUS_CHARGING;
ab8500_chargalg_state_to(di, STATE_TEMP_LOWHIGH);
power_supply_changed(di->chargalg_psy);
fallthrough;
case STATE_TEMP_LOWHIGH:
if (!di->events.btemp_lowhigh)
ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
break;
case STATE_WD_EXPIRED_INIT:
ab8500_chargalg_stop_charging(di);
ab8500_chargalg_state_to(di, STATE_WD_EXPIRED);
fallthrough;
case STATE_WD_EXPIRED:
if (!di->events.ac_wd_expired &&
!di->events.usb_wd_expired)
ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
break;
case STATE_TEMP_UNDEROVER_INIT:
ab8500_chargalg_stop_charging(di);
ab8500_chargalg_state_to(di, STATE_TEMP_UNDEROVER);
fallthrough;
case STATE_TEMP_UNDEROVER:
if (!di->events.btemp_underover)
ab8500_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);
}
/**
* ab8500_chargalg_periodic_work() - Periodic work for the algorithm
* @work: pointer to the work_struct structure
*
* Work queue function for the charging algorithm
*/
static void ab8500_chargalg_periodic_work(struct work_struct *work)
{
struct ab8500_chargalg *di = container_of(work,
struct ab8500_chargalg, chargalg_periodic_work.work);
ab8500_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);
}
/**
* ab8500_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 ab8500_chargalg_wd_work(struct work_struct *work)
{
int ret;
struct ab8500_chargalg *di = container_of(work,
struct ab8500_chargalg, chargalg_wd_work.work);
ret = ab8500_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);
}
/**
* ab8500_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 ab8500_chargalg_work(struct work_struct *work)
{
struct ab8500_chargalg *di = container_of(work,
struct ab8500_chargalg, chargalg_work);
ab8500_chargalg_algorithm(di);
}
/**
* ab8500_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 ab8500_chargalg_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct ab8500_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->bi->temp_min)
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 ab8500_chargalg_curr_step_show(struct ab8500_chargalg *di,
char *buf)
{
return sprintf(buf, "%d\n", di->curr_status.curr_step_ua);
}
static ssize_t ab8500_chargalg_curr_step_store(struct ab8500_chargalg *di,
const char *buf, size_t length)
{
long param;
int ret;
ret = kstrtol(buf, 10, &param);
if (ret < 0)
return ret;
di->curr_status.curr_step_ua = param;
if (di->curr_status.curr_step_ua >= CHARGALG_CURR_STEP_LOW_UA &&
di->curr_status.curr_step_ua <= CHARGALG_CURR_STEP_HIGH_UA) {
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 ab8500_chargalg_en_show(struct ab8500_chargalg *di,
char *buf)
{
return sprintf(buf, "%d\n",
di->susp_status.ac_suspended &&
di->susp_status.usb_suspended);
}
static ssize_t ab8500_chargalg_en_store(struct ab8500_chargalg *di,
const char *buf, size_t length)
{
long 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 ab8500_chargalg_sysfs_entry ab8500_chargalg_en_charger =
__ATTR(chargalg, 0644, ab8500_chargalg_en_show,
ab8500_chargalg_en_store);
static struct ab8500_chargalg_sysfs_entry ab8500_chargalg_curr_step =
__ATTR(chargalg_curr_step, 0644, ab8500_chargalg_curr_step_show,
ab8500_chargalg_curr_step_store);
static ssize_t ab8500_chargalg_sysfs_show(struct kobject *kobj,
struct attribute *attr, char *buf)
{
struct ab8500_chargalg_sysfs_entry *entry = container_of(attr,
struct ab8500_chargalg_sysfs_entry, attr);
struct ab8500_chargalg *di = container_of(kobj,
struct ab8500_chargalg, chargalg_kobject);
if (!entry->show)
return -EIO;
return entry->show(di, buf);
}
static ssize_t ab8500_chargalg_sysfs_charger(struct kobject *kobj,
struct attribute *attr, const char *buf, size_t length)
{
struct ab8500_chargalg_sysfs_entry *entry = container_of(attr,
struct ab8500_chargalg_sysfs_entry, attr);
struct ab8500_chargalg *di = container_of(kobj,
struct ab8500_chargalg, chargalg_kobject);
if (!entry->store)
return -EIO;
return entry->store(di, buf, length);
}
static struct attribute *ab8500_chargalg_chg[] = {
&ab8500_chargalg_en_charger.attr,
&ab8500_chargalg_curr_step.attr,
NULL,
};
static const struct sysfs_ops ab8500_chargalg_sysfs_ops = {
.show = ab8500_chargalg_sysfs_show,
.store = ab8500_chargalg_sysfs_charger,
};
static struct kobj_type ab8500_chargalg_ktype = {
.sysfs_ops = &ab8500_chargalg_sysfs_ops,
.default_attrs = ab8500_chargalg_chg,
};
/**
* ab8500_chargalg_sysfs_exit() - de-init of sysfs entry
* @di: pointer to the struct ab8500_chargalg
*
* This function removes the entry in sysfs.
*/
static void ab8500_chargalg_sysfs_exit(struct ab8500_chargalg *di)
{
kobject_del(&di->chargalg_kobject);
}
/**
* ab8500_chargalg_sysfs_init() - init of sysfs entry
* @di: pointer to the struct ab8500_chargalg
*
* This function adds an entry in sysfs.
* Returns error code in case of failure else 0(on success)
*/
static int ab8500_chargalg_sysfs_init(struct ab8500_chargalg *di)
{
int ret = 0;
ret = kobject_init_and_add(&di->chargalg_kobject,
&ab8500_chargalg_ktype,
NULL, "ab8500_chargalg");
if (ret < 0)
dev_err(di->dev, "failed to create sysfs entry\n");
return ret;
}
/* Exposure to the sysfs interface <<END>> */
static int __maybe_unused ab8500_chargalg_resume(struct device *dev)
{
struct ab8500_chargalg *di = dev_get_drvdata(dev);
/* 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 __maybe_unused ab8500_chargalg_suspend(struct device *dev)
{
struct ab8500_chargalg *di = dev_get_drvdata(dev);
if (di->chg_info.online_chg)
cancel_delayed_work_sync(&di->chargalg_wd_work);
cancel_delayed_work_sync(&di->chargalg_periodic_work);
return 0;
}
static char *supply_interface[] = {
"ab8500_fg",
};
static const struct power_supply_desc ab8500_chargalg_desc = {
.name = "ab8500_chargalg",
.type = POWER_SUPPLY_TYPE_BATTERY,
.properties = ab8500_chargalg_props,
.num_properties = ARRAY_SIZE(ab8500_chargalg_props),
.get_property = ab8500_chargalg_get_property,
.external_power_changed = ab8500_chargalg_external_power_changed,
};
static int ab8500_chargalg_bind(struct device *dev, struct device *master,
void *data)
{
struct ab8500_chargalg *di = dev_get_drvdata(dev);
/* Create a work queue for the chargalg */
di->chargalg_wq = alloc_ordered_workqueue("ab8500_chargalg_wq",
WQ_MEM_RECLAIM);
if (di->chargalg_wq == NULL) {
dev_err(di->dev, "failed to create work queue\n");
return -ENOMEM;
}
/* Run the charging algorithm */
queue_delayed_work(di->chargalg_wq, &di->chargalg_periodic_work, 0);
return 0;
}
static void ab8500_chargalg_unbind(struct device *dev, struct device *master,
void *data)
{
struct ab8500_chargalg *di = dev_get_drvdata(dev);
/* Stop all timers and work */
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);
flush_scheduled_work();
}
static const struct component_ops ab8500_chargalg_component_ops = {
.bind = ab8500_chargalg_bind,
.unbind = ab8500_chargalg_unbind,
};
static int ab8500_chargalg_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct power_supply_config psy_cfg = {};
struct ab8500_chargalg *di;
int ret = 0;
di = devm_kzalloc(dev, sizeof(*di), GFP_KERNEL);
if (!di)
return -ENOMEM;
di->bm = &ab8500_bm_data;
/* get device struct and parent */
di->dev = 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 = ab8500_chargalg_safety_timer_expired;
/* Initilialize maintenance timer */
hrtimer_init(&di->maintenance_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
di->maintenance_timer.function =
ab8500_chargalg_maintenance_timer_expired;
/* Init work for chargalg */
INIT_DEFERRABLE_WORK(&di->chargalg_periodic_work,
ab8500_chargalg_periodic_work);
INIT_DEFERRABLE_WORK(&di->chargalg_wd_work,
ab8500_chargalg_wd_work);
/* Init work for chargalg */
INIT_WORK(&di->chargalg_work, ab8500_chargalg_work);
/* To detect charger at startup */
di->chg_info.prev_conn_chg = -1;
/* Register chargalg power supply class */
di->chargalg_psy = devm_power_supply_register(di->dev,
&ab8500_chargalg_desc,
&psy_cfg);
if (IS_ERR(di->chargalg_psy)) {
dev_err(di->dev, "failed to register chargalg psy\n");
return PTR_ERR(di->chargalg_psy);
}
platform_set_drvdata(pdev, di);
/* sysfs interface to enable/disable charging from user space */
ret = ab8500_chargalg_sysfs_init(di);
if (ret) {
dev_err(di->dev, "failed to create sysfs entry\n");
return ret;
}
di->curr_status.curr_step_ua = CHARGALG_CURR_STEP_HIGH_UA;
dev_info(di->dev, "probe success\n");
return component_add(dev, &ab8500_chargalg_component_ops);
}
static int ab8500_chargalg_remove(struct platform_device *pdev)
{
struct ab8500_chargalg *di = platform_get_drvdata(pdev);
component_del(&pdev->dev, &ab8500_chargalg_component_ops);
/* sysfs interface to enable/disable charging from user space */
ab8500_chargalg_sysfs_exit(di);
return 0;
}
static SIMPLE_DEV_PM_OPS(ab8500_chargalg_pm_ops, ab8500_chargalg_suspend, ab8500_chargalg_resume);
static const struct of_device_id ab8500_chargalg_match[] = {
{ .compatible = "stericsson,ab8500-chargalg", },
{ },
};
struct platform_driver ab8500_chargalg_driver = {
.probe = ab8500_chargalg_probe,
.remove = ab8500_chargalg_remove,
.driver = {
.name = "ab8500_chargalg",
.of_match_table = ab8500_chargalg_match,
.pm = &ab8500_chargalg_pm_ops,
},
};
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Johan Palsson, Karl Komierowski");
MODULE_ALIAS("platform:ab8500-chargalg");
MODULE_DESCRIPTION("ab8500 battery charging algorithm");
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