--- /dev/null
+/*
+ * Copyright (C) ST-Ericsson SA 2012
+ *
+ * Charging algorithm driver for abx500 variants
+ *
+ * License Terms: GNU General Public License v2
+ * Authors:
+ * Johan Palsson <johan.palsson@stericsson.com>
+ * Karl Komierowski <karl.komierowski@stericsson.com>
+ * Arun R Murthy <arun.murthy@stericsson.com>
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/device.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/mfd/abx500.h>
+#include <linux/mfd/abx500/ux500_chargalg.h>
+#include <linux/mfd/abx500/ab8500-bm.h>
+
+/* Watchdog kick interval */
+#define CHG_WD_INTERVAL (6 * HZ)
+
+/* End-of-charge criteria counter */
+#define EOC_COND_CNT 10
+
+/* Recharge criteria counter */
+#define RCH_COND_CNT 3
+
+#define to_abx500_chargalg_device_info(x) container_of((x), \
+ struct abx500_chargalg, chargalg_psy);
+
+enum abx500_chargers {
+ NO_CHG,
+ AC_CHG,
+ USB_CHG,
+};
+
+struct abx500_chargalg_charger_info {
+ enum abx500_chargers conn_chg;
+ enum abx500_chargers prev_conn_chg;
+ enum abx500_chargers online_chg;
+ enum abx500_chargers prev_online_chg;
+ enum abx500_chargers charger_type;
+ bool usb_chg_ok;
+ bool ac_chg_ok;
+ int usb_volt;
+ int usb_curr;
+ int ac_volt;
+ int ac_curr;
+ int usb_vset;
+ int usb_iset;
+ int ac_vset;
+ int ac_iset;
+};
+
+struct abx500_chargalg_suspension_status {
+ bool suspended_change;
+ bool ac_suspended;
+ bool usb_suspended;
+};
+
+struct abx500_chargalg_battery_data {
+ int temp;
+ int volt;
+ int avg_curr;
+ int inst_curr;
+ int percent;
+};
+
+enum abx500_chargalg_states {
+ STATE_HANDHELD_INIT,
+ STATE_HANDHELD,
+ STATE_CHG_NOT_OK_INIT,
+ STATE_CHG_NOT_OK,
+ STATE_HW_TEMP_PROTECT_INIT,
+ STATE_HW_TEMP_PROTECT,
+ STATE_NORMAL_INIT,
+ STATE_NORMAL,
+ STATE_WAIT_FOR_RECHARGE_INIT,
+ STATE_WAIT_FOR_RECHARGE,
+ STATE_MAINTENANCE_A_INIT,
+ STATE_MAINTENANCE_A,
+ STATE_MAINTENANCE_B_INIT,
+ STATE_MAINTENANCE_B,
+ STATE_TEMP_UNDEROVER_INIT,
+ STATE_TEMP_UNDEROVER,
+ STATE_TEMP_LOWHIGH_INIT,
+ STATE_TEMP_LOWHIGH,
+ STATE_SUSPENDED_INIT,
+ STATE_SUSPENDED,
+ STATE_OVV_PROTECT_INIT,
+ STATE_OVV_PROTECT,
+ STATE_SAFETY_TIMER_EXPIRED_INIT,
+ STATE_SAFETY_TIMER_EXPIRED,
+ STATE_BATT_REMOVED_INIT,
+ STATE_BATT_REMOVED,
+ STATE_WD_EXPIRED_INIT,
+ STATE_WD_EXPIRED,
+};
+
+static const char *states[] = {
+ "HANDHELD_INIT",
+ "HANDHELD",
+ "CHG_NOT_OK_INIT",
+ "CHG_NOT_OK",
+ "HW_TEMP_PROTECT_INIT",
+ "HW_TEMP_PROTECT",
+ "NORMAL_INIT",
+ "NORMAL",
+ "WAIT_FOR_RECHARGE_INIT",
+ "WAIT_FOR_RECHARGE",
+ "MAINTENANCE_A_INIT",
+ "MAINTENANCE_A",
+ "MAINTENANCE_B_INIT",
+ "MAINTENANCE_B",
+ "TEMP_UNDEROVER_INIT",
+ "TEMP_UNDEROVER",
+ "TEMP_LOWHIGH_INIT",
+ "TEMP_LOWHIGH",
+ "SUSPENDED_INIT",
+ "SUSPENDED",
+ "OVV_PROTECT_INIT",
+ "OVV_PROTECT",
+ "SAFETY_TIMER_EXPIRED_INIT",
+ "SAFETY_TIMER_EXPIRED",
+ "BATT_REMOVED_INIT",
+ "BATT_REMOVED",
+ "WD_EXPIRED_INIT",
+ "WD_EXPIRED",
+};
+
+struct abx500_chargalg_events {
+ bool batt_unknown;
+ bool mainextchnotok;
+ bool batt_ovv;
+ bool batt_rem;
+ bool btemp_underover;
+ bool btemp_lowhigh;
+ bool main_thermal_prot;
+ bool usb_thermal_prot;
+ bool main_ovv;
+ bool vbus_ovv;
+ bool usbchargernotok;
+ bool safety_timer_expired;
+ bool maintenance_timer_expired;
+ bool ac_wd_expired;
+ bool usb_wd_expired;
+ bool ac_cv_active;
+ bool usb_cv_active;
+ bool vbus_collapsed;
+};
+
+/**
+ * struct abx500_charge_curr_maximization - Charger maximization parameters
+ * @original_iset: the non optimized/maximised charger current
+ * @current_iset: the charging current used at this moment
+ * @test_delta_i: the delta between the current we want to charge and the
+ current that is really going into the battery
+ * @condition_cnt: number of iterations needed before a new charger current
+ is set
+ * @max_current: maximum charger current
+ * @wait_cnt: to avoid too fast current step down in case of charger
+ * voltage collapse, we insert this delay between step
+ * down
+ * @level: tells in how many steps the charging current has been
+ increased
+ */
+struct abx500_charge_curr_maximization {
+ int original_iset;
+ int current_iset;
+ int test_delta_i;
+ int condition_cnt;
+ int max_current;
+ int wait_cnt;
+ u8 level;
+};
+
+enum maxim_ret {
+ MAXIM_RET_NOACTION,
+ MAXIM_RET_CHANGE,
+ MAXIM_RET_IBAT_TOO_HIGH,
+};
+
+/**
+ * struct abx500_chargalg - abx500 Charging algorithm device information
+ * @dev: pointer to the structure device
+ * @charge_status: battery operating status
+ * @eoc_cnt: counter used to determine end-of_charge
+ * @rch_cnt: counter used to determine start of recharge
+ * @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
+ * @pdata: pointer to the abx500_chargalg platform data
+ * @bat: pointer to the abx500_bm platform data
+ * @chargalg_psy: structure that holds the battery properties exposed by
+ * the charging algorithm
+ * @events: structure for information about events triggered
+ * @chargalg_wq: work queue for running the charging algorithm
+ * @chargalg_periodic_work: work to run the charging algorithm periodically
+ * @chargalg_wd_work: work to kick the charger watchdog periodically
+ * @chargalg_work: work to run the charging algorithm instantly
+ * @safety_timer: charging safety timer
+ * @maintenance_timer: maintenance charging timer
+ * @chargalg_kobject: structure of type kobject
+ */
+struct abx500_chargalg {
+ struct device *dev;
+ int charge_status;
+ int eoc_cnt;
+ int rch_cnt;
+ bool maintenance_chg;
+ int t_hyst_norm;
+ int t_hyst_lowhigh;
+ enum abx500_chargalg_states charge_state;
+ struct abx500_charge_curr_maximization ccm;
+ struct abx500_chargalg_charger_info chg_info;
+ struct abx500_chargalg_battery_data batt_data;
+ struct abx500_chargalg_suspension_status susp_status;
+ struct abx500_chargalg_platform_data *pdata;
+ struct abx500_bm_data *bat;
+ struct power_supply chargalg_psy;
+ struct ux500_charger *ac_chg;
+ struct ux500_charger *usb_chg;
+ struct abx500_chargalg_events events;
+ struct workqueue_struct *chargalg_wq;
+ struct delayed_work chargalg_periodic_work;
+ struct delayed_work chargalg_wd_work;
+ struct work_struct chargalg_work;
+ struct timer_list safety_timer;
+ struct timer_list maintenance_timer;
+ struct kobject chargalg_kobject;
+};
+
+/* Main battery properties */
+static enum power_supply_property abx500_chargalg_props[] = {
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_HEALTH,
+};
+
+/**
+ * abx500_chargalg_safety_timer_expired() - Expiration of the safety timer
+ * @data: pointer to the abx500_chargalg structure
+ *
+ * This function gets called when the safety timer for the charger
+ * expires
+ */
+static void abx500_chargalg_safety_timer_expired(unsigned long data)
+{
+ struct abx500_chargalg *di = (struct abx500_chargalg *) data;
+ 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);
+}
+
+/**
+ * abx500_chargalg_maintenance_timer_expired() - Expiration of
+ * the maintenance timer
+ * @i: pointer to the abx500_chargalg structure
+ *
+ * This function gets called when the maintenence timer
+ * expires
+ */
+static void abx500_chargalg_maintenance_timer_expired(unsigned long data)
+{
+
+ struct abx500_chargalg *di = (struct abx500_chargalg *) data;
+ 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);
+}
+
+/**
+ * abx500_chargalg_state_to() - Change charge state
+ * @di: pointer to the abx500_chargalg structure
+ *
+ * This function gets called when a charge state change should occur
+ */
+static void abx500_chargalg_state_to(struct abx500_chargalg *di,
+ enum abx500_chargalg_states state)
+{
+ dev_dbg(di->dev,
+ "State changed: %s (From state: [%d] %s =to=> [%d] %s )\n",
+ di->charge_state == state ? "NO" : "YES",
+ di->charge_state,
+ states[di->charge_state],
+ state,
+ states[state]);
+
+ di->charge_state = state;
+}
+
+/**
+ * abx500_chargalg_check_charger_connection() - Check charger connection change
+ * @di: pointer to the abx500_chargalg structure
+ *
+ * This function will check if there is a change in the charger connection
+ * and change charge state accordingly. AC has precedence over USB.
+ */
+static int abx500_chargalg_check_charger_connection(struct abx500_chargalg *di)
+{
+ if (di->chg_info.conn_chg != di->chg_info.prev_conn_chg ||
+ di->susp_status.suspended_change) {
+ /*
+ * Charger state changed or suspension
+ * has changed since last update
+ */
+ if ((di->chg_info.conn_chg & AC_CHG) &&
+ !di->susp_status.ac_suspended) {
+ dev_dbg(di->dev, "Charging source is AC\n");
+ if (di->chg_info.charger_type != AC_CHG) {
+ di->chg_info.charger_type = AC_CHG;
+ abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
+ }
+ } else if ((di->chg_info.conn_chg & USB_CHG) &&
+ !di->susp_status.usb_suspended) {
+ dev_dbg(di->dev, "Charging source is USB\n");
+ di->chg_info.charger_type = USB_CHG;
+ abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
+ } else if (di->chg_info.conn_chg &&
+ (di->susp_status.ac_suspended ||
+ di->susp_status.usb_suspended)) {
+ dev_dbg(di->dev, "Charging is suspended\n");
+ di->chg_info.charger_type = NO_CHG;
+ abx500_chargalg_state_to(di, STATE_SUSPENDED_INIT);
+ } else {
+ dev_dbg(di->dev, "Charging source is OFF\n");
+ di->chg_info.charger_type = NO_CHG;
+ abx500_chargalg_state_to(di, STATE_HANDHELD_INIT);
+ }
+ di->chg_info.prev_conn_chg = di->chg_info.conn_chg;
+ di->susp_status.suspended_change = false;
+ }
+ return di->chg_info.conn_chg;
+}
+
+/**
+ * abx500_chargalg_start_safety_timer() - Start charging safety timer
+ * @di: pointer to the abx500_chargalg structure
+ *
+ * The safety timer is used to avoid overcharging of old or bad batteries.
+ * There are different timers for AC and USB
+ */
+static void abx500_chargalg_start_safety_timer(struct abx500_chargalg *di)
+{
+ unsigned long timer_expiration = 0;
+
+ switch (di->chg_info.charger_type) {
+ case AC_CHG:
+ timer_expiration =
+ round_jiffies(jiffies +
+ (di->bat->main_safety_tmr_h * 3600 * HZ));
+ break;
+
+ case USB_CHG:
+ timer_expiration =
+ round_jiffies(jiffies +
+ (di->bat->usb_safety_tmr_h * 3600 * HZ));
+ break;
+
+ default:
+ dev_err(di->dev, "Unknown charger to charge from\n");
+ break;
+ }
+
+ di->events.safety_timer_expired = false;
+ di->safety_timer.expires = timer_expiration;
+ if (!timer_pending(&di->safety_timer))
+ add_timer(&di->safety_timer);
+ else
+ mod_timer(&di->safety_timer, timer_expiration);
+}
+
+/**
+ * abx500_chargalg_stop_safety_timer() - Stop charging safety timer
+ * @di: pointer to the abx500_chargalg structure
+ *
+ * The safety timer is stopped whenever the NORMAL state is exited
+ */
+static void abx500_chargalg_stop_safety_timer(struct abx500_chargalg *di)
+{
+ di->events.safety_timer_expired = false;
+ del_timer(&di->safety_timer);
+}
+
+/**
+ * abx500_chargalg_start_maintenance_timer() - Start charging maintenance timer
+ * @di: pointer to the abx500_chargalg structure
+ * @duration: duration of ther maintenance timer in hours
+ *
+ * The maintenance timer is used to maintain the charge in the battery once
+ * the battery is considered full. These timers are chosen to match the
+ * discharge curve of the battery
+ */
+static void abx500_chargalg_start_maintenance_timer(struct abx500_chargalg *di,
+ int duration)
+{
+ unsigned long timer_expiration;
+
+ /* Convert from hours to jiffies */
+ timer_expiration = round_jiffies(jiffies + (duration * 3600 * HZ));
+
+ di->events.maintenance_timer_expired = false;
+ di->maintenance_timer.expires = timer_expiration;
+ if (!timer_pending(&di->maintenance_timer))
+ add_timer(&di->maintenance_timer);
+ else
+ mod_timer(&di->maintenance_timer, timer_expiration);
+}
+
+/**
+ * abx500_chargalg_stop_maintenance_timer() - Stop maintenance timer
+ * @di: pointer to the abx500_chargalg structure
+ *
+ * The maintenance timer is stopped whenever maintenance ends or when another
+ * state is entered
+ */
+static void abx500_chargalg_stop_maintenance_timer(struct abx500_chargalg *di)
+{
+ di->events.maintenance_timer_expired = false;
+ del_timer(&di->maintenance_timer);
+}
+
+/**
+ * abx500_chargalg_kick_watchdog() - Kick charger watchdog
+ * @di: pointer to the abx500_chargalg structure
+ *
+ * The charger watchdog have to be kicked periodically whenever the charger is
+ * on, else the ABB will reset the system
+ */
+static int abx500_chargalg_kick_watchdog(struct abx500_chargalg *di)
+{
+ /* Check if charger exists and kick watchdog if charging */
+ if (di->ac_chg && di->ac_chg->ops.kick_wd &&
+ di->chg_info.online_chg & AC_CHG)
+ return di->ac_chg->ops.kick_wd(di->ac_chg);
+ else if (di->usb_chg && di->usb_chg->ops.kick_wd &&
+ di->chg_info.online_chg & USB_CHG)
+ return di->usb_chg->ops.kick_wd(di->usb_chg);
+
+ return -ENXIO;
+}
+
+/**
+ * abx500_chargalg_ac_en() - Turn on/off the AC charger
+ * @di: pointer to the abx500_chargalg structure
+ * @enable: charger on/off
+ * @vset: requested charger output voltage
+ * @iset: requested charger output current
+ *
+ * The AC charger will be turned on/off with the requested charge voltage and
+ * current
+ */
+static int abx500_chargalg_ac_en(struct abx500_chargalg *di, int enable,
+ int vset, int iset)
+{
+ 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;
+
+ return di->ac_chg->ops.enable(di->ac_chg, enable, vset, iset);
+}
+
+/**
+ * abx500_chargalg_usb_en() - Turn on/off the USB charger
+ * @di: pointer to the abx500_chargalg structure
+ * @enable: charger on/off
+ * @vset: requested charger output voltage
+ * @iset: requested charger output current
+ *
+ * The USB charger will be turned on/off with the requested charge voltage and
+ * current
+ */
+static int abx500_chargalg_usb_en(struct abx500_chargalg *di, int enable,
+ int vset, int iset)
+{
+ if (!di->usb_chg || !di->usb_chg->ops.enable)
+ return -ENXIO;
+
+ /* Select maximum of what both the charger and the battery supports */
+ if (di->usb_chg->max_out_volt)
+ vset = min(vset, di->usb_chg->max_out_volt);
+ if (di->usb_chg->max_out_curr)
+ iset = min(iset, di->usb_chg->max_out_curr);
+
+ di->chg_info.usb_iset = iset;
+ di->chg_info.usb_vset = vset;
+
+ return di->usb_chg->ops.enable(di->usb_chg, enable, vset, iset);
+}
+
+/**
+ * abx500_chargalg_update_chg_curr() - Update charger current
+ * @di: pointer to the abx500_chargalg structure
+ * @iset: requested charger output current
+ *
+ * The charger output current will be updated for the charger
+ * that is currently in use
+ */
+static int abx500_chargalg_update_chg_curr(struct abx500_chargalg *di,
+ int iset)
+{
+ /* Check if charger exists and update current if charging */
+ if (di->ac_chg && di->ac_chg->ops.update_curr &&
+ di->chg_info.charger_type & AC_CHG) {
+ /*
+ * Select maximum of what both the charger
+ * and the battery supports
+ */
+ if (di->ac_chg->max_out_curr)
+ iset = min(iset, di->ac_chg->max_out_curr);
+
+ di->chg_info.ac_iset = iset;
+
+ return di->ac_chg->ops.update_curr(di->ac_chg, iset);
+ } else if (di->usb_chg && di->usb_chg->ops.update_curr &&
+ di->chg_info.charger_type & USB_CHG) {
+ /*
+ * Select maximum of what both the charger
+ * and the battery supports
+ */
+ if (di->usb_chg->max_out_curr)
+ iset = min(iset, di->usb_chg->max_out_curr);
+
+ di->chg_info.usb_iset = iset;
+
+ return di->usb_chg->ops.update_curr(di->usb_chg, iset);
+ }
+
+ return -ENXIO;
+}
+
+/**
+ * abx500_chargalg_stop_charging() - Stop charging
+ * @di: pointer to the abx500_chargalg structure
+ *
+ * This function is called from any state where charging should be stopped.
+ * All charging is disabled and all status parameters and timers are changed
+ * accordingly
+ */
+static void abx500_chargalg_stop_charging(struct abx500_chargalg *di)
+{
+ abx500_chargalg_ac_en(di, false, 0, 0);
+ abx500_chargalg_usb_en(di, false, 0, 0);
+ abx500_chargalg_stop_safety_timer(di);
+ abx500_chargalg_stop_maintenance_timer(di);
+ di->charge_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
+ di->maintenance_chg = false;
+ cancel_delayed_work(&di->chargalg_wd_work);
+ power_supply_changed(&di->chargalg_psy);
+}
+
+/**
+ * abx500_chargalg_hold_charging() - Pauses charging
+ * @di: pointer to the abx500_chargalg structure
+ *
+ * This function is called in the case where maintenance charging has been
+ * disabled and instead a battery voltage mode is entered to check when the
+ * battery voltage has reached a certain recharge voltage
+ */
+static void abx500_chargalg_hold_charging(struct abx500_chargalg *di)
+{
+ abx500_chargalg_ac_en(di, false, 0, 0);
+ abx500_chargalg_usb_en(di, false, 0, 0);
+ abx500_chargalg_stop_safety_timer(di);
+ abx500_chargalg_stop_maintenance_timer(di);
+ di->charge_status = POWER_SUPPLY_STATUS_CHARGING;
+ di->maintenance_chg = false;
+ cancel_delayed_work(&di->chargalg_wd_work);
+ power_supply_changed(&di->chargalg_psy);
+}
+
+/**
+ * abx500_chargalg_start_charging() - Start the charger
+ * @di: pointer to the abx500_chargalg structure
+ * @vset: requested charger output voltage
+ * @iset: requested charger output current
+ *
+ * A charger will be enabled depending on the requested charger type that was
+ * detected previously.
+ */
+static void abx500_chargalg_start_charging(struct abx500_chargalg *di,
+ int vset, int iset)
+{
+ switch (di->chg_info.charger_type) {
+ case AC_CHG:
+ dev_dbg(di->dev,
+ "AC parameters: Vset %d, Ich %d\n", vset, iset);
+ abx500_chargalg_usb_en(di, false, 0, 0);
+ abx500_chargalg_ac_en(di, true, vset, iset);
+ break;
+
+ case USB_CHG:
+ dev_dbg(di->dev,
+ "USB parameters: Vset %d, Ich %d\n", vset, iset);
+ abx500_chargalg_ac_en(di, false, 0, 0);
+ abx500_chargalg_usb_en(di, true, vset, iset);
+ break;
+
+ default:
+ dev_err(di->dev, "Unknown charger to charge from\n");
+ break;
+ }
+}
+
+/**
+ * abx500_chargalg_check_temp() - Check battery temperature ranges
+ * @di: pointer to the abx500_chargalg structure
+ *
+ * The battery temperature is checked against the predefined limits and the
+ * charge state is changed accordingly
+ */
+static void abx500_chargalg_check_temp(struct abx500_chargalg *di)
+{
+ if (di->batt_data.temp > (di->bat->temp_low + di->t_hyst_norm) &&
+ di->batt_data.temp < (di->bat->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->bat->temp_high) &&
+ (di->batt_data.temp <
+ (di->bat->temp_over - di->t_hyst_lowhigh))) ||
+ ((di->batt_data.temp >
+ (di->bat->temp_under + di->t_hyst_lowhigh)) &&
+ (di->batt_data.temp <= di->bat->temp_low))) {
+ /* TEMP minor!!!!! */
+ di->events.btemp_underover = false;
+ di->events.btemp_lowhigh = true;
+ di->t_hyst_norm = di->bat->temp_hysteresis;
+ di->t_hyst_lowhigh = 0;
+ } else if (di->batt_data.temp <= di->bat->temp_under ||
+ di->batt_data.temp >= di->bat->temp_over) {
+ /* TEMP major!!!!! */
+ di->events.btemp_underover = true;
+ di->events.btemp_lowhigh = false;
+ di->t_hyst_norm = 0;
+ di->t_hyst_lowhigh = di->bat->temp_hysteresis;
+ } else {
+ /* Within hysteresis */
+ dev_dbg(di->dev, "Within hysteresis limit temp: %d "
+ "hyst_lowhigh %d, hyst normal %d\n",
+ di->batt_data.temp, di->t_hyst_lowhigh,
+ di->t_hyst_norm);
+ }
+ }
+}
+
+/**
+ * abx500_chargalg_check_charger_voltage() - Check charger voltage
+ * @di: pointer to the abx500_chargalg structure
+ *
+ * Charger voltage is checked against maximum limit
+ */
+static void abx500_chargalg_check_charger_voltage(struct abx500_chargalg *di)
+{
+ if (di->chg_info.usb_volt > di->bat->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->bat->chg_params->ac_volt_max)
+ di->chg_info.ac_chg_ok = false;
+ else
+ di->chg_info.ac_chg_ok = true;
+
+}
+
+/**
+ * abx500_chargalg_end_of_charge() - Check if end-of-charge criteria is fulfilled
+ * @di: pointer to the abx500_chargalg structure
+ *
+ * End-of-charge criteria is fulfilled when the battery voltage is above a
+ * certain limit and the battery current is below a certain limit for a
+ * predefined number of consecutive seconds. If true, the battery is full
+ */
+static void abx500_chargalg_end_of_charge(struct abx500_chargalg *di)
+{
+ if (di->charge_status == POWER_SUPPLY_STATUS_CHARGING &&
+ di->charge_state == STATE_NORMAL &&
+ !di->maintenance_chg && (di->batt_data.volt >=
+ di->bat->bat_type[di->bat->batt_id].termination_vol ||
+ di->events.usb_cv_active || di->events.ac_cv_active) &&
+ di->batt_data.avg_curr <
+ di->bat->bat_type[di->bat->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 abx500_chargalg *di)
+{
+ di->ccm.original_iset =
+ di->bat->bat_type[di->bat->batt_id].normal_cur_lvl;
+ di->ccm.current_iset =
+ di->bat->bat_type[di->bat->batt_id].normal_cur_lvl;
+ di->ccm.test_delta_i = di->bat->maxi->charger_curr_step;
+ di->ccm.max_current = di->bat->maxi->chg_curr;
+ di->ccm.condition_cnt = di->bat->maxi->wait_cycles;
+ di->ccm.level = 0;
+}
+
+/**
+ * abx500_chargalg_chg_curr_maxim - increases the charger current to
+ * compensate for the system load
+ * @di pointer to the abx500_chargalg structure
+ *
+ * This maximization function is used to raise the charger current to get the
+ * battery current as close to the optimal value as possible. The battery
+ * current during charging is affected by the system load
+ */
+static enum maxim_ret abx500_chargalg_chg_curr_maxim(struct abx500_chargalg *di)
+{
+ int delta_i;
+
+ if (!di->bat->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->bat->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->bat->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->bat->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->bat->maxi->wait_cycles;
+ return MAXIM_RET_NOACTION;
+ }
+}
+
+static void handle_maxim_chg_curr(struct abx500_chargalg *di)
+{
+ enum maxim_ret ret;
+ int result;
+
+ ret = abx500_chargalg_chg_curr_maxim(di);
+ switch (ret) {
+ case MAXIM_RET_CHANGE:
+ result = abx500_chargalg_update_chg_curr(di,
+ di->ccm.current_iset);
+ if (result)
+ dev_err(di->dev, "failed to set chg curr\n");
+ break;
+ case MAXIM_RET_IBAT_TOO_HIGH:
+ result = abx500_chargalg_update_chg_curr(di,
+ di->bat->bat_type[di->bat->batt_id].normal_cur_lvl);
+ if (result)
+ dev_err(di->dev, "failed to set chg curr\n");
+ break;
+
+ case MAXIM_RET_NOACTION:
+ default:
+ /* Do nothing..*/
+ break;
+ }
+}
+
+static int abx500_chargalg_get_ext_psy_data(struct device *dev, void *data)
+{
+ struct power_supply *psy;
+ struct power_supply *ext;
+ struct abx500_chargalg *di;
+ union power_supply_propval ret;
+ int i, j;
+ bool psy_found = false;
+
+ psy = (struct power_supply *)data;
+ ext = dev_get_drvdata(dev);
+ di = to_abx500_chargalg_device_info(psy);
+ /* For all psy where the driver name appears in any supplied_to */
+ for (i = 0; i < ext->num_supplicants; i++) {
+ if (!strcmp(ext->supplied_to[i], psy->name))
+ psy_found = true;
+ }
+ if (!psy_found)
+ return 0;
+
+ /* Go through all properties for the psy */
+ for (j = 0; j < ext->num_properties; j++) {
+ enum power_supply_property prop;
+ prop = ext->properties[j];
+
+ /* Initialize chargers if not already done */
+ if (!di->ac_chg &&
+ ext->type == POWER_SUPPLY_TYPE_MAINS)
+ di->ac_chg = psy_to_ux500_charger(ext);
+ else if (!di->usb_chg &&
+ ext->type == POWER_SUPPLY_TYPE_USB)
+ di->usb_chg = psy_to_ux500_charger(ext);
+
+ if (ext->get_property(ext, prop, &ret))
+ continue;
+ switch (prop) {
+ case POWER_SUPPLY_PROP_PRESENT:
+ switch (ext->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->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->type) {
+ case POWER_SUPPLY_TYPE_BATTERY:
+ break;
+ case POWER_SUPPLY_TYPE_MAINS:
+ switch (ret.intval) {
+ case POWER_SUPPLY_HEALTH_UNSPEC_FAILURE:
+ di->events.mainextchnotok = true;
+ di->events.main_thermal_prot = false;
+ di->events.main_ovv = false;
+ di->events.ac_wd_expired = false;
+ break;
+ case POWER_SUPPLY_HEALTH_DEAD:
+ di->events.ac_wd_expired = true;
+ di->events.mainextchnotok = false;
+ di->events.main_ovv = false;
+ di->events.main_thermal_prot = false;
+ break;
+ case POWER_SUPPLY_HEALTH_COLD:
+ case POWER_SUPPLY_HEALTH_OVERHEAT:
+ di->events.main_thermal_prot = true;
+ di->events.mainextchnotok = false;
+ di->events.main_ovv = false;
+ di->events.ac_wd_expired = false;
+ break;
+ case POWER_SUPPLY_HEALTH_OVERVOLTAGE:
+ di->events.main_ovv = true;
+ di->events.mainextchnotok = false;
+ di->events.main_thermal_prot = false;
+ di->events.ac_wd_expired = false;
+ break;
+ case POWER_SUPPLY_HEALTH_GOOD:
+ di->events.main_thermal_prot = false;
+ di->events.mainextchnotok = false;
+ di->events.main_ovv = false;
+ di->events.ac_wd_expired = false;
+ break;
+ default:
+ break;
+ }
+ break;
+
+ case POWER_SUPPLY_TYPE_USB:
+ switch (ret.intval) {
+ case POWER_SUPPLY_HEALTH_UNSPEC_FAILURE:
+ di->events.usbchargernotok = true;
+ di->events.usb_thermal_prot = false;
+ di->events.vbus_ovv = false;
+ di->events.usb_wd_expired = false;
+ break;
+ case POWER_SUPPLY_HEALTH_DEAD:
+ di->events.usb_wd_expired = true;
+ di->events.usbchargernotok = false;
+ di->events.usb_thermal_prot = false;
+ di->events.vbus_ovv = false;
+ break;
+ case POWER_SUPPLY_HEALTH_COLD:
+ case POWER_SUPPLY_HEALTH_OVERHEAT:
+ di->events.usb_thermal_prot = true;
+ di->events.usbchargernotok = false;
+ di->events.vbus_ovv = false;
+ di->events.usb_wd_expired = false;
+ break;
+ case POWER_SUPPLY_HEALTH_OVERVOLTAGE:
+ di->events.vbus_ovv = true;
+ di->events.usbchargernotok = false;
+ di->events.usb_thermal_prot = false;
+ di->events.usb_wd_expired = false;
+ break;
+ case POWER_SUPPLY_HEALTH_GOOD:
+ di->events.usbchargernotok = false;
+ di->events.usb_thermal_prot = false;
+ di->events.vbus_ovv = false;
+ di->events.usb_wd_expired = false;
+ break;
+ default:
+ break;
+ }
+ default:
+ break;
+ }
+ break;
+
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ switch (ext->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->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->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->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->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:
+ di->batt_data.percent = ret.intval;
+ break;
+ default:
+ break;
+ }
+ }
+ return 0;
+}
+
+/**
+ * abx500_chargalg_external_power_changed() - callback for power supply changes
+ * @psy: pointer to the structure power_supply
+ *
+ * This function is the entry point of the pointer external_power_changed
+ * of the structure power_supply.
+ * This function gets executed when there is a change in any external power
+ * supply that this driver needs to be notified of.
+ */
+static void abx500_chargalg_external_power_changed(struct power_supply *psy)
+{
+ struct abx500_chargalg *di = to_abx500_chargalg_device_info(psy);
+
+ /*
+ * Trigger execution of the algorithm instantly and read
+ * all power_supply properties there instead
+ */
+ queue_work(di->chargalg_wq, &di->chargalg_work);
+}
+
+/**
+ * abx500_chargalg_algorithm() - Main function for the algorithm
+ * @di: pointer to the abx500_chargalg structure
+ *
+ * This is the main control function for the charging algorithm.
+ * It is called periodically or when something happens that will
+ * trigger a state change
+ */
+static void abx500_chargalg_algorithm(struct abx500_chargalg *di)
+{
+ int charger_status;
+
+ /* Collect data from all power_supply class devices */
+ class_for_each_device(power_supply_class, NULL,
+ &di->chargalg_psy, abx500_chargalg_get_ext_psy_data);
+
+ abx500_chargalg_end_of_charge(di);
+ abx500_chargalg_check_temp(di);
+ abx500_chargalg_check_charger_voltage(di);
+
+ charger_status = abx500_chargalg_check_charger_connection(di);
+ /*
+ * 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->bat->chg_unknown_bat)) {
+ if (di->charge_state != STATE_HANDHELD) {
+ di->events.safety_timer_expired = false;
+ abx500_chargalg_state_to(di, STATE_HANDHELD_INIT);
+ }
+ }
+
+ /* If suspended, we should not continue checking the flags */
+ else if (di->charge_state == STATE_SUSPENDED_INIT ||
+ di->charge_state == STATE_SUSPENDED) {
+ /* We don't do anything here, just don,t continue */
+ }
+
+ /* Safety timer expiration */
+ else if (di->events.safety_timer_expired) {
+ if (di->charge_state != STATE_SAFETY_TIMER_EXPIRED)
+ abx500_chargalg_state_to(di,
+ STATE_SAFETY_TIMER_EXPIRED_INIT);
+ }
+ /*
+ * Check if any interrupts has occured
+ * that will prevent us from charging
+ */
+
+ /* Battery removed */
+ else if (di->events.batt_rem) {
+ if (di->charge_state != STATE_BATT_REMOVED)
+ abx500_chargalg_state_to(di, STATE_BATT_REMOVED_INIT);
+ }
+ /* Main or USB charger not ok. */
+ else if (di->events.mainextchnotok || di->events.usbchargernotok) {
+ /*
+ * If vbus_collapsed is set, we have to lower the charger
+ * current, which is done in the normal state below
+ */
+ if (di->charge_state != STATE_CHG_NOT_OK &&
+ !di->events.vbus_collapsed)
+ abx500_chargalg_state_to(di, STATE_CHG_NOT_OK_INIT);
+ }
+ /* VBUS, Main or VBAT OVV. */
+ else if (di->events.vbus_ovv ||
+ di->events.main_ovv ||
+ di->events.batt_ovv ||
+ !di->chg_info.usb_chg_ok ||
+ !di->chg_info.ac_chg_ok) {
+ if (di->charge_state != STATE_OVV_PROTECT)
+ abx500_chargalg_state_to(di, STATE_OVV_PROTECT_INIT);
+ }
+ /* USB Thermal, stop charging */
+ else if (di->events.main_thermal_prot ||
+ di->events.usb_thermal_prot) {
+ if (di->charge_state != STATE_HW_TEMP_PROTECT)
+ abx500_chargalg_state_to(di,
+ STATE_HW_TEMP_PROTECT_INIT);
+ }
+ /* Battery temp over/under */
+ else if (di->events.btemp_underover) {
+ if (di->charge_state != STATE_TEMP_UNDEROVER)
+ abx500_chargalg_state_to(di,
+ STATE_TEMP_UNDEROVER_INIT);
+ }
+ /* Watchdog expired */
+ else if (di->events.ac_wd_expired ||
+ di->events.usb_wd_expired) {
+ if (di->charge_state != STATE_WD_EXPIRED)
+ abx500_chargalg_state_to(di, STATE_WD_EXPIRED_INIT);
+ }
+ /* Battery temp high/low */
+ else if (di->events.btemp_lowhigh) {
+ if (di->charge_state != STATE_TEMP_LOWHIGH)
+ abx500_chargalg_state_to(di, STATE_TEMP_LOWHIGH_INIT);
+ }
+
+ dev_dbg(di->dev,
+ "[CHARGALG] Vb %d Ib_avg %d Ib_inst %d Tb %d Cap %d Maint %d "
+ "State %s Active_chg %d Chg_status %d AC %d USB %d "
+ "AC_online %d USB_online %d AC_CV %d USB_CV %d AC_I %d "
+ "USB_I %d AC_Vset %d AC_Iset %d USB_Vset %d USB_Iset %d\n",
+ di->batt_data.volt,
+ di->batt_data.avg_curr,
+ di->batt_data.inst_curr,
+ di->batt_data.temp,
+ di->batt_data.percent,
+ di->maintenance_chg,
+ states[di->charge_state],
+ di->chg_info.charger_type,
+ di->charge_status,
+ di->chg_info.conn_chg & AC_CHG,
+ di->chg_info.conn_chg & USB_CHG,
+ di->chg_info.online_chg & AC_CHG,
+ di->chg_info.online_chg & USB_CHG,
+ di->events.ac_cv_active,
+ di->events.usb_cv_active,
+ di->chg_info.ac_curr,
+ di->chg_info.usb_curr,
+ di->chg_info.ac_vset,
+ di->chg_info.ac_iset,
+ di->chg_info.usb_vset,
+ di->chg_info.usb_iset);
+
+ switch (di->charge_state) {
+ case STATE_HANDHELD_INIT:
+ abx500_chargalg_stop_charging(di);
+ di->charge_status = POWER_SUPPLY_STATUS_DISCHARGING;
+ abx500_chargalg_state_to(di, STATE_HANDHELD);
+ /* Intentional fallthrough */
+
+ case STATE_HANDHELD:
+ break;
+
+ case STATE_SUSPENDED_INIT:
+ if (di->susp_status.ac_suspended)
+ abx500_chargalg_ac_en(di, false, 0, 0);
+ if (di->susp_status.usb_suspended)
+ abx500_chargalg_usb_en(di, false, 0, 0);
+ abx500_chargalg_stop_safety_timer(di);
+ abx500_chargalg_stop_maintenance_timer(di);
+ di->charge_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
+ di->maintenance_chg = false;
+ abx500_chargalg_state_to(di, STATE_SUSPENDED);
+ power_supply_changed(&di->chargalg_psy);
+ /* Intentional fallthrough */
+
+ case STATE_SUSPENDED:
+ /* CHARGING is suspended */
+ break;
+
+ case STATE_BATT_REMOVED_INIT:
+ abx500_chargalg_stop_charging(di);
+ abx500_chargalg_state_to(di, STATE_BATT_REMOVED);
+ /* Intentional fallthrough */
+
+ case STATE_BATT_REMOVED:
+ if (!di->events.batt_rem)
+ abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
+ break;
+
+ case STATE_HW_TEMP_PROTECT_INIT:
+ abx500_chargalg_stop_charging(di);
+ abx500_chargalg_state_to(di, STATE_HW_TEMP_PROTECT);
+ /* Intentional fallthrough */
+
+ case STATE_HW_TEMP_PROTECT:
+ if (!di->events.main_thermal_prot &&
+ !di->events.usb_thermal_prot)
+ abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
+ break;
+
+ case STATE_OVV_PROTECT_INIT:
+ abx500_chargalg_stop_charging(di);
+ abx500_chargalg_state_to(di, STATE_OVV_PROTECT);
+ /* Intentional fallthrough */
+
+ case STATE_OVV_PROTECT:
+ if (!di->events.vbus_ovv &&
+ !di->events.main_ovv &&
+ !di->events.batt_ovv &&
+ di->chg_info.usb_chg_ok &&
+ di->chg_info.ac_chg_ok)
+ abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
+ break;
+
+ case STATE_CHG_NOT_OK_INIT:
+ abx500_chargalg_stop_charging(di);
+ abx500_chargalg_state_to(di, STATE_CHG_NOT_OK);
+ /* Intentional fallthrough */
+
+ case STATE_CHG_NOT_OK:
+ if (!di->events.mainextchnotok &&
+ !di->events.usbchargernotok)
+ abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
+ break;
+
+ case STATE_SAFETY_TIMER_EXPIRED_INIT:
+ abx500_chargalg_stop_charging(di);
+ abx500_chargalg_state_to(di, STATE_SAFETY_TIMER_EXPIRED);
+ /* Intentional fallthrough */
+
+ case STATE_SAFETY_TIMER_EXPIRED:
+ /* We exit this state when charger is removed */
+ break;
+
+ case STATE_NORMAL_INIT:
+ abx500_chargalg_start_charging(di,
+ di->bat->bat_type[di->bat->batt_id].normal_vol_lvl,
+ di->bat->bat_type[di->bat->batt_id].normal_cur_lvl);
+ abx500_chargalg_state_to(di, STATE_NORMAL);
+ abx500_chargalg_start_safety_timer(di);
+ abx500_chargalg_stop_maintenance_timer(di);
+ init_maxim_chg_curr(di);
+ di->charge_status = POWER_SUPPLY_STATUS_CHARGING;
+ di->eoc_cnt = 0;
+ di->maintenance_chg = false;
+ power_supply_changed(&di->chargalg_psy);
+
+ break;
+
+ case STATE_NORMAL:
+ handle_maxim_chg_curr(di);
+ if (di->charge_status == POWER_SUPPLY_STATUS_FULL &&
+ di->maintenance_chg) {
+ if (di->bat->no_maintenance)
+ abx500_chargalg_state_to(di,
+ STATE_WAIT_FOR_RECHARGE_INIT);
+ else
+ abx500_chargalg_state_to(di,
+ STATE_MAINTENANCE_A_INIT);
+ }
+ break;
+
+ /* This state will be used when the maintenance state is disabled */
+ case STATE_WAIT_FOR_RECHARGE_INIT:
+ abx500_chargalg_hold_charging(di);
+ abx500_chargalg_state_to(di, STATE_WAIT_FOR_RECHARGE);
+ di->rch_cnt = RCH_COND_CNT;
+ /* Intentional fallthrough */
+
+ case STATE_WAIT_FOR_RECHARGE:
+ if (di->batt_data.volt <=
+ di->bat->bat_type[di->bat->batt_id].recharge_vol) {
+ if (di->rch_cnt-- == 0)
+ abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
+ } else
+ di->rch_cnt = RCH_COND_CNT;
+ break;
+
+ case STATE_MAINTENANCE_A_INIT:
+ abx500_chargalg_stop_safety_timer(di);
+ abx500_chargalg_start_maintenance_timer(di,
+ di->bat->bat_type[
+ di->bat->batt_id].maint_a_chg_timer_h);
+ abx500_chargalg_start_charging(di,
+ di->bat->bat_type[
+ di->bat->batt_id].maint_a_vol_lvl,
+ di->bat->bat_type[
+ di->bat->batt_id].maint_a_cur_lvl);
+ abx500_chargalg_state_to(di, STATE_MAINTENANCE_A);
+ power_supply_changed(&di->chargalg_psy);
+ /* Intentional fallthrough*/
+
+ case STATE_MAINTENANCE_A:
+ if (di->events.maintenance_timer_expired) {
+ abx500_chargalg_stop_maintenance_timer(di);
+ abx500_chargalg_state_to(di, STATE_MAINTENANCE_B_INIT);
+ }
+ break;
+
+ case STATE_MAINTENANCE_B_INIT:
+ abx500_chargalg_start_maintenance_timer(di,
+ di->bat->bat_type[
+ di->bat->batt_id].maint_b_chg_timer_h);
+ abx500_chargalg_start_charging(di,
+ di->bat->bat_type[
+ di->bat->batt_id].maint_b_vol_lvl,
+ di->bat->bat_type[
+ di->bat->batt_id].maint_b_cur_lvl);
+ abx500_chargalg_state_to(di, STATE_MAINTENANCE_B);
+ power_supply_changed(&di->chargalg_psy);
+ /* Intentional fallthrough*/
+
+ case STATE_MAINTENANCE_B:
+ if (di->events.maintenance_timer_expired) {
+ abx500_chargalg_stop_maintenance_timer(di);
+ abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
+ }
+ break;
+
+ case STATE_TEMP_LOWHIGH_INIT:
+ abx500_chargalg_start_charging(di,
+ di->bat->bat_type[
+ di->bat->batt_id].low_high_vol_lvl,
+ di->bat->bat_type[
+ di->bat->batt_id].low_high_cur_lvl);
+ abx500_chargalg_stop_maintenance_timer(di);
+ di->charge_status = POWER_SUPPLY_STATUS_CHARGING;
+ abx500_chargalg_state_to(di, STATE_TEMP_LOWHIGH);
+ power_supply_changed(&di->chargalg_psy);
+ /* Intentional fallthrough */
+
+ case STATE_TEMP_LOWHIGH:
+ if (!di->events.btemp_lowhigh)
+ abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
+ break;
+
+ case STATE_WD_EXPIRED_INIT:
+ abx500_chargalg_stop_charging(di);
+ abx500_chargalg_state_to(di, STATE_WD_EXPIRED);
+ /* Intentional fallthrough */
+
+ case STATE_WD_EXPIRED:
+ if (!di->events.ac_wd_expired &&
+ !di->events.usb_wd_expired)
+ abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
+ break;
+
+ case STATE_TEMP_UNDEROVER_INIT:
+ abx500_chargalg_stop_charging(di);
+ abx500_chargalg_state_to(di, STATE_TEMP_UNDEROVER);
+ /* Intentional fallthrough */
+
+ case STATE_TEMP_UNDEROVER:
+ if (!di->events.btemp_underover)
+ abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
+ break;
+ }
+
+ /* Start charging directly if the new state is a charge state */
+ if (di->charge_state == STATE_NORMAL_INIT ||
+ di->charge_state == STATE_MAINTENANCE_A_INIT ||
+ di->charge_state == STATE_MAINTENANCE_B_INIT)
+ queue_work(di->chargalg_wq, &di->chargalg_work);
+}
+
+/**
+ * abx500_chargalg_periodic_work() - Periodic work for the algorithm
+ * @work: pointer to the work_struct structure
+ *
+ * Work queue function for the charging algorithm
+ */
+static void abx500_chargalg_periodic_work(struct work_struct *work)
+{
+ struct abx500_chargalg *di = container_of(work,
+ struct abx500_chargalg, chargalg_periodic_work.work);
+
+ abx500_chargalg_algorithm(di);
+
+ /*
+ * If a charger is connected then the battery has to be monitored
+ * frequently, else the work can be delayed.
+ */
+ if (di->chg_info.conn_chg)
+ queue_delayed_work(di->chargalg_wq,
+ &di->chargalg_periodic_work,
+ di->bat->interval_charging * HZ);
+ else
+ queue_delayed_work(di->chargalg_wq,
+ &di->chargalg_periodic_work,
+ di->bat->interval_not_charging * HZ);
+}
+
+/**
+ * abx500_chargalg_wd_work() - periodic work to kick the charger watchdog
+ * @work: pointer to the work_struct structure
+ *
+ * Work queue function for kicking the charger watchdog
+ */
+static void abx500_chargalg_wd_work(struct work_struct *work)
+{
+ int ret;
+ struct abx500_chargalg *di = container_of(work,
+ struct abx500_chargalg, chargalg_wd_work.work);
+
+ dev_dbg(di->dev, "abx500_chargalg_wd_work\n");
+
+ ret = abx500_chargalg_kick_watchdog(di);
+ if (ret < 0)
+ dev_err(di->dev, "failed to kick watchdog\n");
+
+ queue_delayed_work(di->chargalg_wq,
+ &di->chargalg_wd_work, CHG_WD_INTERVAL);
+}
+
+/**
+ * abx500_chargalg_work() - Work to run the charging algorithm instantly
+ * @work: pointer to the work_struct structure
+ *
+ * Work queue function for calling the charging algorithm
+ */
+static void abx500_chargalg_work(struct work_struct *work)
+{
+ struct abx500_chargalg *di = container_of(work,
+ struct abx500_chargalg, chargalg_work);
+
+ abx500_chargalg_algorithm(di);
+}
+
+/**
+ * abx500_chargalg_get_property() - get the chargalg properties
+ * @psy: pointer to the power_supply structure
+ * @psp: pointer to the power_supply_property structure
+ * @val: pointer to the power_supply_propval union
+ *
+ * This function gets called when an application tries to get the
+ * chargalg properties by reading the sysfs files.
+ * status: charging/discharging/full/unknown
+ * health: health of the battery
+ * Returns error code in case of failure else 0 on success
+ */
+static int abx500_chargalg_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct abx500_chargalg *di;
+
+ di = to_abx500_chargalg_device_info(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->bat->temp_under)
+ val->intval = POWER_SUPPLY_HEALTH_COLD;
+ else
+ val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
+ } else {
+ val->intval = POWER_SUPPLY_HEALTH_GOOD;
+ }
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+/* Exposure to the sysfs interface */
+
+/**
+ * abx500_chargalg_sysfs_charger() - sysfs store operations
+ * @kobj: pointer to the struct kobject
+ * @attr: pointer to the struct attribute
+ * @buf: buffer that holds the parameter passed from userspace
+ * @length: length of the parameter passed
+ *
+ * Returns length of the buffer(input taken from user space) on success
+ * else error code on failure
+ * The operation to be performed on passing the parameters from the user space.
+ */
+static ssize_t abx500_chargalg_sysfs_charger(struct kobject *kobj,
+ struct attribute *attr, const char *buf, size_t length)
+{
+ struct abx500_chargalg *di = container_of(kobj,
+ struct abx500_chargalg, chargalg_kobject);
+ long int param;
+ int ac_usb;
+ int ret;
+ char entry = *attr->name;
+
+ switch (entry) {
+ case 'c':
+ ret = strict_strtol(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");
+ };
+ break;
+ };
+ return strlen(buf);
+}
+
+static struct attribute abx500_chargalg_en_charger = \
+{
+ .name = "chargalg",
+ .mode = S_IWUGO,
+};
+
+static struct attribute *abx500_chargalg_chg[] = {
+ &abx500_chargalg_en_charger,
+ NULL
+};
+
+const struct sysfs_ops abx500_chargalg_sysfs_ops = {
+ .store = abx500_chargalg_sysfs_charger,
+};
+
+static struct kobj_type abx500_chargalg_ktype = {
+ .sysfs_ops = &abx500_chargalg_sysfs_ops,
+ .default_attrs = abx500_chargalg_chg,
+};
+
+/**
+ * abx500_chargalg_sysfs_exit() - de-init of sysfs entry
+ * @di: pointer to the struct abx500_chargalg
+ *
+ * This function removes the entry in sysfs.
+ */
+static void abx500_chargalg_sysfs_exit(struct abx500_chargalg *di)
+{
+ kobject_del(&di->chargalg_kobject);
+}
+
+/**
+ * abx500_chargalg_sysfs_init() - init of sysfs entry
+ * @di: pointer to the struct abx500_chargalg
+ *
+ * This function adds an entry in sysfs.
+ * Returns error code in case of failure else 0(on success)
+ */
+static int abx500_chargalg_sysfs_init(struct abx500_chargalg *di)
+{
+ int ret = 0;
+
+ ret = kobject_init_and_add(&di->chargalg_kobject,
+ &abx500_chargalg_ktype,
+ NULL, "abx500_chargalg");
+ if (ret < 0)
+ dev_err(di->dev, "failed to create sysfs entry\n");
+
+ return ret;
+}
+/* Exposure to the sysfs interface <<END>> */
+
+#if defined(CONFIG_PM)
+static int abx500_chargalg_resume(struct platform_device *pdev)
+{
+ struct abx500_chargalg *di = platform_get_drvdata(pdev);
+
+ /* Kick charger watchdog if charging (any charger online) */
+ if (di->chg_info.online_chg)
+ queue_delayed_work(di->chargalg_wq, &di->chargalg_wd_work, 0);
+
+ /*
+ * Run the charging algorithm directly to be sure we don't
+ * do it too seldom
+ */
+ queue_delayed_work(di->chargalg_wq, &di->chargalg_periodic_work, 0);
+
+ return 0;
+}
+
+static int abx500_chargalg_suspend(struct platform_device *pdev,
+ pm_message_t state)
+{
+ struct abx500_chargalg *di = platform_get_drvdata(pdev);
+
+ if (di->chg_info.online_chg)
+ cancel_delayed_work_sync(&di->chargalg_wd_work);
+
+ cancel_delayed_work_sync(&di->chargalg_periodic_work);
+
+ return 0;
+}
+#else
+#define abx500_chargalg_suspend NULL
+#define abx500_chargalg_resume NULL
+#endif
+
+static int __devexit abx500_chargalg_remove(struct platform_device *pdev)
+{
+ struct abx500_chargalg *di = platform_get_drvdata(pdev);
+
+ /* sysfs interface to enable/disbale charging from user space */
+ abx500_chargalg_sysfs_exit(di);
+
+ /* Delete the work queue */
+ destroy_workqueue(di->chargalg_wq);
+
+ flush_scheduled_work();
+ power_supply_unregister(&di->chargalg_psy);
+ platform_set_drvdata(pdev, NULL);
+ kfree(di);
+
+ return 0;
+}
+
+static int __devinit abx500_chargalg_probe(struct platform_device *pdev)
+{
+ struct abx500_bm_plat_data *plat_data;
+ int ret = 0;
+
+ struct abx500_chargalg *di =
+ kzalloc(sizeof(struct abx500_chargalg), GFP_KERNEL);
+ if (!di)
+ return -ENOMEM;
+
+ /* get device struct */
+ di->dev = &pdev->dev;
+
+ plat_data = pdev->dev.platform_data;
+ di->pdata = plat_data->chargalg;
+ di->bat = plat_data->battery;
+
+ /* chargalg supply */
+ di->chargalg_psy.name = "abx500_chargalg";
+ di->chargalg_psy.type = POWER_SUPPLY_TYPE_BATTERY;
+ di->chargalg_psy.properties = abx500_chargalg_props;
+ di->chargalg_psy.num_properties = ARRAY_SIZE(abx500_chargalg_props);
+ di->chargalg_psy.get_property = abx500_chargalg_get_property;
+ di->chargalg_psy.supplied_to = di->pdata->supplied_to;
+ di->chargalg_psy.num_supplicants = di->pdata->num_supplicants;
+ di->chargalg_psy.external_power_changed =
+ abx500_chargalg_external_power_changed;
+
+ /* Initilialize safety timer */
+ init_timer(&di->safety_timer);
+ di->safety_timer.function = abx500_chargalg_safety_timer_expired;
+ di->safety_timer.data = (unsigned long) di;
+
+ /* Initilialize maintenance timer */
+ init_timer(&di->maintenance_timer);
+ di->maintenance_timer.function =
+ abx500_chargalg_maintenance_timer_expired;
+ di->maintenance_timer.data = (unsigned long) di;
+
+ /* Create a work queue for the chargalg */
+ di->chargalg_wq =
+ create_singlethread_workqueue("abx500_chargalg_wq");
+ if (di->chargalg_wq == NULL) {
+ dev_err(di->dev, "failed to create work queue\n");
+ goto free_device_info;
+ }
+
+ /* Init work for chargalg */
+ INIT_DELAYED_WORK_DEFERRABLE(&di->chargalg_periodic_work,
+ abx500_chargalg_periodic_work);
+ INIT_DELAYED_WORK_DEFERRABLE(&di->chargalg_wd_work,
+ abx500_chargalg_wd_work);
+
+ /* Init work for chargalg */
+ INIT_WORK(&di->chargalg_work, abx500_chargalg_work);
+
+ /* To detect charger at startup */
+ di->chg_info.prev_conn_chg = -1;
+
+ /* Register chargalg power supply class */
+ ret = power_supply_register(di->dev, &di->chargalg_psy);
+ if (ret) {
+ dev_err(di->dev, "failed to register chargalg psy\n");
+ goto free_chargalg_wq;
+ }
+
+ platform_set_drvdata(pdev, di);
+
+ /* sysfs interface to enable/disable charging from user space */
+ ret = abx500_chargalg_sysfs_init(di);
+ if (ret) {
+ dev_err(di->dev, "failed to create sysfs entry\n");
+ goto free_psy;
+ }
+
+ /* Run the charging algorithm */
+ queue_delayed_work(di->chargalg_wq, &di->chargalg_periodic_work, 0);
+
+ dev_info(di->dev, "probe success\n");
+ return ret;
+
+free_psy:
+ power_supply_unregister(&di->chargalg_psy);
+free_chargalg_wq:
+ destroy_workqueue(di->chargalg_wq);
+free_device_info:
+ kfree(di);
+
+ return ret;
+}
+
+static struct platform_driver abx500_chargalg_driver = {
+ .probe = abx500_chargalg_probe,
+ .remove = __devexit_p(abx500_chargalg_remove),
+ .suspend = abx500_chargalg_suspend,
+ .resume = abx500_chargalg_resume,
+ .driver = {
+ .name = "abx500-chargalg",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init abx500_chargalg_init(void)
+{
+ return platform_driver_register(&abx500_chargalg_driver);
+}
+
+static void __exit abx500_chargalg_exit(void)
+{
+ platform_driver_unregister(&abx500_chargalg_driver);
+}
+
+module_init(abx500_chargalg_init);
+module_exit(abx500_chargalg_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Johan Palsson, Karl Komierowski");
+MODULE_ALIAS("platform:abx500-chargalg");
+MODULE_DESCRIPTION("abx500 battery charging algorithm");
projects / firefly-linux-kernel-4.4.55.git / commitdiff