| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Arun Murthy | 5496 | 78.46% | 2 | 3.64% |
| Linus Walleij | 922 | 13.16% | 24 | 43.64% |
| Lee Jones | 317 | 4.53% | 11 | 20.00% |
| Krzysztof Kozlowski | 90 | 1.28% | 3 | 5.45% |
| Rajanikanth H.V | 57 | 0.81% | 1 | 1.82% |
| Marcus Cooper | 38 | 0.54% | 1 | 1.82% |
| Andy Shevchenko | 29 | 0.41% | 1 | 1.82% |
| Gustavo A. R. Silva | 25 | 0.36% | 2 | 3.64% |
| Nicolas Guion | 10 | 0.14% | 1 | 1.82% |
| Colin Ian King | 5 | 0.07% | 2 | 3.64% |
| Mattias Wallin | 5 | 0.07% | 1 | 1.82% |
| Bhaktipriya Shridhar | 3 | 0.04% | 1 | 1.82% |
| Uwe Kleine-König | 2 | 0.03% | 1 | 1.82% |
| Loic Pallardy | 2 | 0.03% | 1 | 1.82% |
| Tejun Heo | 2 | 0.03% | 1 | 1.82% |
| Sebastian Reichel | 1 | 0.01% | 1 | 1.82% |
| Thomas Gleixner | 1 | 0.01% | 1 | 1.82% |
| Total | 7005 | 55 |
// 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 /* * 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_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_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", "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_low; bool btemp_high; 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 * @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 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 * @bm: Platform specific battery management information * @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 *parent; 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; }; /* Main battery properties */ static enum power_supply_property ab8500_chargalg_props[] = { POWER_SUPPLY_PROP_STATUS, POWER_SUPPLY_PROP_HEALTH, }; /** * 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 maintenance 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) { 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) { /* Charger state changed since last update */ if (di->chg_info.conn_chg & AC_CHG) { dev_info(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) { dev_info(di->dev, "Charging source is USB\n"); di->chg_info.charger_type = USB_CHG; ab8500_chargalg_state_to(di, STATE_NORMAL_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; } return di->chg_info.conn_chg; } /** * 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 the maintenance timer in minutes * * 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) { /* Set a timer in minutes with a 30 second range */ hrtimer_set_expires_range(&di->maintenance_timer, ktime_set(duration * 60, 0), ktime_set(30, 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) { 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) { 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; 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_low = false; di->events.btemp_high = 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))) { /* Alert zone for high temperature */ di->events.btemp_underover = false; di->events.btemp_high = true; di->t_hyst_norm = di->bm->temp_hysteresis; di->t_hyst_lowhigh = 0; } else if ((di->batt_data.temp > (bi->temp_min + di->t_hyst_lowhigh)) && (di->batt_data.temp <= bi->temp_alert_min)) { /* Alert zone for low temperature */ di->events.btemp_underover = false; di->events.btemp_low = 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_low = false; di->events.btemp_high = 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->voltage_max_design_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.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) { if (!di->bm->maxi->ena_maxi) return MAXIM_RET_NOACTION; 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.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; } 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_time_to_restart() - time to restart CC/CV charging? * @di: charging algorithm state * * This checks if the voltage or capacity of the battery has fallen so * low that we need to restart the CC/CV charge cycle. */ static bool ab8500_chargalg_time_to_restart(struct ab8500_chargalg *di) { struct power_supply_battery_info *bi = di->bm->bi; /* Sanity check - these need to have some reasonable values */ if (!di->batt_data.volt_uv || !di->batt_data.percent) return false; /* Some batteries tell us at which voltage we should restart charging */ if (bi->charge_restart_voltage_uv > 0) { if (di->batt_data.volt_uv <= bi->charge_restart_voltage_uv) return true; /* Else we restart as we reach a certain capacity */ } else { if (di->batt_data.percent <= AB8500_RECHARGE_CAP) return true; } return false; } /** * 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; struct power_supply_maintenance_charge_table *mt; int charger_status; int ret; /* Collect data from all power_supply class devices */ power_supply_for_each_device(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); 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); } } /* 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 occurred * 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_low || di->events.btemp_high) { 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_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 (bi->constant_charge_current_max_ua == 0) /* "charging" with 0 uA */ ab8500_chargalg_stop_charging(di); else { ab8500_chargalg_start_charging(di, bi->constant_charge_voltage_max_uv, bi->constant_charge_current_max_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) { /* * The battery is fully charged, check if we support * maintenance charging else go back to waiting for * the recharge voltage limit. */ if (!power_supply_supports_maintenance_charging(bi)) 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 (ab8500_chargalg_time_to_restart(di)) ab8500_chargalg_state_to(di, STATE_NORMAL_INIT); break; case STATE_MAINTENANCE_A_INIT: mt = power_supply_get_maintenance_charging_setting(bi, 0); if (!mt) { /* No maintenance A state, go back to normal */ ab8500_chargalg_state_to(di, STATE_NORMAL_INIT); power_supply_changed(di->chargalg_psy); break; } ab8500_chargalg_stop_safety_timer(di); ab8500_chargalg_start_maintenance_timer(di, mt->charge_safety_timer_minutes); ab8500_chargalg_start_charging(di, mt->charge_voltage_max_uv, mt->charge_current_max_ua); 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); } /* * This happens if the voltage drops too quickly during * maintenance charging, especially in older batteries. */ if (ab8500_chargalg_time_to_restart(di)) { ab8500_chargalg_state_to(di, STATE_NORMAL_INIT); dev_info(di->dev, "restarted charging from maintenance state A - battery getting old?\n"); } break; case STATE_MAINTENANCE_B_INIT: mt = power_supply_get_maintenance_charging_setting(bi, 1); if (!mt) { /* No maintenance B state, go back to normal */ ab8500_chargalg_state_to(di, STATE_NORMAL_INIT); power_supply_changed(di->chargalg_psy); break; } ab8500_chargalg_start_maintenance_timer(di, mt->charge_safety_timer_minutes); ab8500_chargalg_start_charging(di, mt->charge_voltage_max_uv, mt->charge_current_max_ua); 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); } /* * This happens if the voltage drops too quickly during * maintenance charging, especially in older batteries. */ if (ab8500_chargalg_time_to_restart(di)) { ab8500_chargalg_state_to(di, STATE_NORMAL_INIT); dev_info(di->dev, "restarted charging from maintenance state B - battery getting old?\n"); } break; case STATE_TEMP_LOWHIGH_INIT: if (di->events.btemp_low) { ab8500_chargalg_start_charging(di, bi->alert_low_temp_charge_voltage_uv, bi->alert_low_temp_charge_current_ua); } else if (di->events.btemp_high) { ab8500_chargalg_start_charging(di, bi->alert_high_temp_charge_voltage_uv, bi->alert_high_temp_charge_current_ua); } else { dev_err(di->dev, "neither low or high temp event occurred\n"); ab8500_chargalg_state_to(di, STATE_NORMAL_INIT); break; } 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_low && !di->events.btemp_high) 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; } 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_UNKNOWN, .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); } 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; 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_MONOTONIC, HRTIMER_MODE_REL); di->safety_timer.function = ab8500_chargalg_safety_timer_expired; /* Initilialize maintenance timer */ hrtimer_init(&di->maintenance_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); 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); dev_info(di->dev, "probe success\n"); return component_add(dev, &ab8500_chargalg_component_ops); } static void ab8500_chargalg_remove(struct platform_device *pdev) { component_del(&pdev->dev, &ab8500_chargalg_component_ops); } 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_new = 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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