| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Arun Murthy | 6431 | 78.36% | 1 | 3.23% |
| Lee Jones | 984 | 11.99% | 10 | 32.26% |
| Linus Walleij | 518 | 6.31% | 7 | 22.58% |
| Krzysztof Kozlowski | 80 | 0.97% | 3 | 9.68% |
| Rajanikanth H.V | 52 | 0.63% | 1 | 3.23% |
| Marcus Cooper | 40 | 0.49% | 1 | 3.23% |
| Loic Pallardy | 36 | 0.44% | 1 | 3.23% |
| Andy Shevchenko | 29 | 0.35% | 1 | 3.23% |
| Gustavo A. R. Silva | 27 | 0.33% | 2 | 6.45% |
| Colin Ian King | 6 | 0.07% | 1 | 3.23% |
| Tejun Heo | 2 | 0.02% | 1 | 3.23% |
| Anton Vorontsov | 1 | 0.01% | 1 | 3.23% |
| Thomas Gleixner | 1 | 0.01% | 1 | 3.23% |
| Total | 8207 | 31 |
// 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 0 #define CHARGALG_CURR_STEP_HIGH 100 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; int usb_curr; int ac_volt; int ac_curr; int usb_vset; int usb_iset; int ac_vset; int ac_iset; }; 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; }; struct ab8500_chargalg_battery_data { int temp; int volt; int avg_curr; int inst_curr; 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: the non optimized/maximised charger current * @current_iset: the charging current used at this moment * @test_delta_i: the delta between the current we want to charge and the current that is really going into the battery * @condition_cnt: number of iterations needed before a new charger current is set * @max_current: maximum charger current * @wait_cnt: to avoid too fast current step down in case of charger * voltage collapse, we insert this delay between step * down * @level: tells in how many steps the charging current has been increased */ struct ab8500_charge_curr_maximization { int original_iset; int current_iset; int test_delta_i; int condition_cnt; int max_current; int wait_cnt; u8 level; }; enum maxim_ret { MAXIM_RET_NOACTION, MAXIM_RET_CHANGE, MAXIM_RET_IBAT_TOO_HIGH, }; /** * struct 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) { switch (di->charge_state) { case STATE_NORMAL: case STATE_MAINTENANCE_A: case STATE_MAINTENANCE_B: break; default: return 0; } if (di->chg_info.charger_type & USB_CHG) { return di->usb_chg->ops.check_enable(di->usb_chg, di->bm->bat_type[di->bm->batt_id].normal_vol_lvl, di->bm->bat_type[di->bm->batt_id].normal_cur_lvl); } else if ((di->chg_info.charger_type & AC_CHG) && !(di->ac_chg->external)) { return di->ac_chg->ops.check_enable(di->ac_chg, di->bm->bat_type[di->bm->batt_id].normal_vol_lvl, di->bm->bat_type[di->bm->batt_id].normal_cur_lvl); } return 0; } /** * 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: requested charger output voltage * @iset: requested charger output current * * The AC charger will be turned on/off with the requested charge voltage and * current */ static int ab8500_chargalg_ac_en(struct ab8500_chargalg *di, int enable, int vset, int iset) { 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) vset = min(vset, di->ac_chg->max_out_volt); if (di->ac_chg->max_out_curr) iset = min(iset, di->ac_chg->max_out_curr); di->chg_info.ac_iset = iset; di->chg_info.ac_vset = vset; /* Enable external charger */ if (enable && di->ac_chg->external && !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, iset); } /** * ab8500_chargalg_usb_en() - Turn on/off the USB charger * @di: pointer to the ab8500_chargalg structure * @enable: charger on/off * @vset: requested charger output voltage * @iset: requested charger output current * * The USB charger will be turned on/off with the requested charge voltage and * current */ static int ab8500_chargalg_usb_en(struct ab8500_chargalg *di, int enable, int vset, int iset) { if (!di->usb_chg || !di->usb_chg->ops.enable) return -ENXIO; /* Select maximum of what both the charger and the battery supports */ if (di->usb_chg->max_out_volt) vset = min(vset, di->usb_chg->max_out_volt); if (di->usb_chg->max_out_curr) iset = min(iset, di->usb_chg->max_out_curr); di->chg_info.usb_iset = iset; di->chg_info.usb_vset = vset; return di->usb_chg->ops.enable(di->usb_chg, enable, vset, iset); } /** * ab8500_chargalg_update_chg_curr() - Update charger current * @di: pointer to the ab8500_chargalg structure * @iset: requested charger output current * * 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) { /* Check if charger exists and update current if charging */ if (di->ac_chg && di->ac_chg->ops.update_curr && di->chg_info.charger_type & AC_CHG) { /* * Select maximum of what both the charger * and the battery supports */ if (di->ac_chg->max_out_curr) iset = min(iset, di->ac_chg->max_out_curr); di->chg_info.ac_iset = iset; return di->ac_chg->ops.update_curr(di->ac_chg, iset); } else if (di->usb_chg && di->usb_chg->ops.update_curr && di->chg_info.charger_type & USB_CHG) { /* * Select maximum of what both the charger * and the battery supports */ if (di->usb_chg->max_out_curr) iset = min(iset, di->usb_chg->max_out_curr); di->chg_info.usb_iset = iset; return di->usb_chg->ops.update_curr(di->usb_chg, iset); } return -ENXIO; } /** * 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: requested charger output voltage * @iset: requested charger output current * * A charger will be enabled depending on the requested charger type that was * detected previously. */ static void ab8500_chargalg_start_charging(struct ab8500_chargalg *di, int vset, int iset) { switch (di->chg_info.charger_type) { case AC_CHG: dev_dbg(di->dev, "AC parameters: Vset %d, Ich %d\n", vset, iset); ab8500_chargalg_usb_en(di, false, 0, 0); ab8500_chargalg_ac_en(di, true, vset, iset); break; case USB_CHG: dev_dbg(di->dev, "USB parameters: Vset %d, Ich %d\n", vset, iset); ab8500_chargalg_ac_en(di, false, 0, 0); ab8500_chargalg_usb_en(di, true, vset, iset); 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) { if (di->batt_data.temp > (di->bm->temp_low + di->t_hyst_norm) && di->batt_data.temp < (di->bm->temp_high - di->t_hyst_norm)) { /* Temp OK! */ di->events.btemp_underover = false; di->events.btemp_lowhigh = false; di->t_hyst_norm = 0; di->t_hyst_lowhigh = 0; } else { if (((di->batt_data.temp >= di->bm->temp_high) && (di->batt_data.temp < (di->bm->temp_over - di->t_hyst_lowhigh))) || ((di->batt_data.temp > (di->bm->temp_under + di->t_hyst_lowhigh)) && (di->batt_data.temp <= di->bm->temp_low))) { /* TEMP minor!!!!! */ di->events.btemp_underover = false; di->events.btemp_lowhigh = true; di->t_hyst_norm = di->bm->temp_hysteresis; di->t_hyst_lowhigh = 0; } else if (di->batt_data.temp <= di->bm->temp_under || di->batt_data.temp >= di->bm->temp_over) { /* TEMP major!!!!! */ di->events.btemp_underover = true; di->events.btemp_lowhigh = false; di->t_hyst_norm = 0; di->t_hyst_lowhigh = di->bm->temp_hysteresis; } else { /* Within hysteresis */ dev_dbg(di->dev, "Within hysteresis limit temp: %d " "hyst_lowhigh %d, hyst normal %d\n", di->batt_data.temp, di->t_hyst_lowhigh, di->t_hyst_norm); } } } /** * 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 > di->bm->chg_params->usb_volt_max) di->chg_info.usb_chg_ok = false; else di->chg_info.usb_chg_ok = true; if (di->chg_info.ac_volt > di->bm->chg_params->ac_volt_max) di->chg_info.ac_chg_ok = false; else di->chg_info.ac_chg_ok = true; } /** * 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 >= di->bm->bat_type[di->bm->batt_id].termination_vol || di->events.usb_cv_active || di->events.ac_cv_active) && di->batt_data.avg_curr < di->bm->bat_type[di->bm->batt_id].termination_curr && di->batt_data.avg_curr > 0) { if (++di->eoc_cnt >= EOC_COND_CNT) { di->eoc_cnt = 0; 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) { di->ccm.original_iset = di->bm->bat_type[di->bm->batt_id].normal_cur_lvl; di->ccm.current_iset = di->bm->bat_type[di->bm->batt_id].normal_cur_lvl; di->ccm.test_delta_i = di->bm->maxi->charger_curr_step; di->ccm.max_current = di->bm->maxi->chg_curr; di->ccm.condition_cnt = di->bm->maxi->wait_cycles; di->ccm.level = 0; } /** * 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; if (!di->bm->maxi->ena_maxi) return MAXIM_RET_NOACTION; delta_i = di->ccm.original_iset - di->batt_data.inst_curr; if (di->events.vbus_collapsed) { dev_dbg(di->dev, "Charger voltage has collapsed %d\n", di->ccm.wait_cnt); if (di->ccm.wait_cnt == 0) { dev_dbg(di->dev, "lowering current\n"); di->ccm.wait_cnt++; di->ccm.condition_cnt = di->bm->maxi->wait_cycles; di->ccm.max_current = di->ccm.current_iset - di->ccm.test_delta_i; di->ccm.current_iset = di->ccm.max_current; di->ccm.level--; return MAXIM_RET_CHANGE; } else { dev_dbg(di->dev, "waiting\n"); /* Let's go in here twice before lowering curr again */ di->ccm.wait_cnt = (di->ccm.wait_cnt + 1) % 3; return MAXIM_RET_NOACTION; } } di->ccm.wait_cnt = 0; if (di->batt_data.inst_curr > di->ccm.original_iset) { dev_dbg(di->dev, " Maximization Ibat (%dmA) too high" " (limit %dmA) (current iset: %dmA)!\n", di->batt_data.inst_curr, di->ccm.original_iset, di->ccm.current_iset); if (di->ccm.current_iset == di->ccm.original_iset) return MAXIM_RET_NOACTION; di->ccm.condition_cnt = di->bm->maxi->wait_cycles; di->ccm.current_iset = di->ccm.original_iset; di->ccm.level = 0; return MAXIM_RET_IBAT_TOO_HIGH; } if (delta_i > di->ccm.test_delta_i && (di->ccm.current_iset + di->ccm.test_delta_i) < di->ccm.max_current) { if (di->ccm.condition_cnt-- == 0) { /* Increse the iset with cco.test_delta_i */ di->ccm.condition_cnt = di->bm->maxi->wait_cycles; di->ccm.current_iset += di->ccm.test_delta_i; di->ccm.level++; dev_dbg(di->dev, " Maximization needed, increase" " with %d mA to %dmA (Optimal ibat: %d)" " Level %d\n", di->ccm.test_delta_i, di->ccm.current_iset, di->ccm.original_iset, di->ccm.level); return MAXIM_RET_CHANGE; } else { return MAXIM_RET_NOACTION; } } else { di->ccm.condition_cnt = di->bm->maxi->wait_cycles; return MAXIM_RET_NOACTION; } } static void handle_maxim_chg_curr(struct ab8500_chargalg *di) { 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); 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, di->bm->bat_type[di->bm->batt_id].normal_cur_lvl); if (result) dev_err(di->dev, "failed to set chg curr\n"); break; case MAXIM_RET_NOACTION: default: /* Do nothing..*/ break; } } static int 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 = ret.intval / 1000; break; case POWER_SUPPLY_TYPE_MAINS: di->chg_info.ac_volt = ret.intval / 1000; break; case POWER_SUPPLY_TYPE_USB: di->chg_info.usb_volt = ret.intval / 1000; break; default: break; } break; case POWER_SUPPLY_PROP_VOLTAGE_AVG: switch (ext->desc->type) { case POWER_SUPPLY_TYPE_MAINS: /* AVG is used to indicate when we are * in CV mode */ if (ret.intval) di->events.ac_cv_active = true; else di->events.ac_cv_active = false; break; case POWER_SUPPLY_TYPE_USB: /* AVG is used to indicate when we are * in CV mode */ if (ret.intval) di->events.usb_cv_active = true; else di->events.usb_cv_active = false; break; default: break; } break; case POWER_SUPPLY_PROP_TECHNOLOGY: switch (ext->desc->type) { case POWER_SUPPLY_TYPE_BATTERY: if (ret.intval) di->events.batt_unknown = false; else di->events.batt_unknown = true; break; default: break; } break; case POWER_SUPPLY_PROP_TEMP: di->batt_data.temp = ret.intval / 10; break; case POWER_SUPPLY_PROP_CURRENT_NOW: switch (ext->desc->type) { case POWER_SUPPLY_TYPE_MAINS: di->chg_info.ac_curr = ret.intval / 1000; break; case POWER_SUPPLY_TYPE_USB: di->chg_info.usb_curr = ret.intval / 1000; break; case POWER_SUPPLY_TYPE_BATTERY: di->batt_data.inst_curr = ret.intval / 1000; break; default: break; } break; case POWER_SUPPLY_PROP_CURRENT_AVG: switch (ext->desc->type) { case POWER_SUPPLY_TYPE_BATTERY: di->batt_data.avg_curr = ret.intval / 1000; break; case POWER_SUPPLY_TYPE_USB: if (ret.intval) di->events.vbus_collapsed = true; else di->events.vbus_collapsed = false; break; default: break; } break; case POWER_SUPPLY_PROP_CAPACITY: if (!capacity_updated) di->batt_data.percent = ret.intval; break; default: break; } } return 0; } /** * 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) { int charger_status; int ret; int curr_step_lvl; /* Collect data from all power_supply class devices */ class_for_each_device(power_supply_class, NULL, di->chargalg_psy, 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, di->batt_data.avg_curr, di->batt_data.inst_curr, di->batt_data.temp, di->batt_data.percent, di->maintenance_chg, states[di->charge_state], di->chg_info.charger_type, di->charge_status, di->chg_info.conn_chg & AC_CHG, di->chg_info.conn_chg & USB_CHG, di->chg_info.online_chg & AC_CHG, di->chg_info.online_chg & USB_CHG, di->events.ac_cv_active, di->events.usb_cv_active, di->chg_info.ac_curr, di->chg_info.usb_curr, di->chg_info.ac_vset, di->chg_info.ac_iset, di->chg_info.usb_vset, di->chg_info.usb_iset); switch (di->charge_state) { case STATE_HANDHELD_INIT: 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 == CHARGALG_CURR_STEP_LOW) ab8500_chargalg_stop_charging(di); else { curr_step_lvl = di->bm->bat_type[ di->bm->batt_id].normal_cur_lvl * di->curr_status.curr_step / CHARGALG_CURR_STEP_HIGH; ab8500_chargalg_start_charging(di, di->bm->bat_type[di->bm->batt_id] .normal_vol_lvl, curr_step_lvl); } 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 <= di->bm->bat_type[di->bm->batt_id].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[ di->bm->batt_id].maint_a_chg_timer_h); ab8500_chargalg_start_charging(di, di->bm->bat_type[ di->bm->batt_id].maint_a_vol_lvl, di->bm->bat_type[ di->bm->batt_id].maint_a_cur_lvl); 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[ di->bm->batt_id].maint_b_chg_timer_h); ab8500_chargalg_start_charging(di, di->bm->bat_type[ di->bm->batt_id].maint_b_vol_lvl, di->bm->bat_type[ di->bm->batt_id].maint_b_cur_lvl); 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[ di->bm->batt_id].low_high_vol_lvl, di->bm->bat_type[ di->bm->batt_id].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->temp_under) val->intval = POWER_SUPPLY_HEALTH_COLD; else val->intval = POWER_SUPPLY_HEALTH_OVERHEAT; } else if (di->charge_state == STATE_SAFETY_TIMER_EXPIRED || di->charge_state == STATE_SAFETY_TIMER_EXPIRED_INIT) { val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; } else { val->intval = POWER_SUPPLY_HEALTH_GOOD; } break; default: return -EINVAL; } return 0; } /* Exposure to the sysfs interface */ static ssize_t ab8500_chargalg_curr_step_show(struct ab8500_chargalg *di, char *buf) { return sprintf(buf, "%d\n", di->curr_status.curr_step); } 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, ¶m); if (ret < 0) return ret; di->curr_status.curr_step = param; if (di->curr_status.curr_step >= CHARGALG_CURR_STEP_LOW && di->curr_status.curr_step <= CHARGALG_CURR_STEP_HIGH) { di->curr_status.curr_step_change = true; queue_work(di->chargalg_wq, &di->chargalg_work); } else dev_info(di->dev, "Wrong current step\n" "Enter 0. Disable AC/USB Charging\n" "1--100. Set AC/USB charging current step\n" "100. Enable AC/USB Charging\n"); return strlen(buf); } static ssize_t 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, ¶m); 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 = CHARGALG_CURR_STEP_HIGH; 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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