include/linux/power/charger-manager.h

   1 /*
   2  * Copyright (C) 2011 Samsung Electronics Co., Ltd.
   3  * MyungJoo.Ham <myungjoo.ham@samsung.com>
   4  *
   5  * Charger Manager.
   6  * This framework enables to control and multiple chargers and to
   7  * monitor charging even in the context of suspend-to-RAM with
   8  * an interface combining the chargers.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13 **/
  14
  15 #ifndef _CHARGER_MANAGER_H
  16 #define _CHARGER_MANAGER_H
  17
  18 #include <linux/power_supply.h>
  19 #include <linux/extcon.h>
  20 #include <linux/alarmtimer.h>
  21
  22 enum data_source {
  23         CM_BATTERY_PRESENT,
  24         CM_NO_BATTERY,
  25         CM_FUEL_GAUGE,
  26         CM_CHARGER_STAT,
  27 };
  28
  29 enum polling_modes {
  30         CM_POLL_DISABLE = 0,
  31         CM_POLL_ALWAYS,
  32         CM_POLL_EXTERNAL_POWER_ONLY,
  33         CM_POLL_CHARGING_ONLY,
  34 };
  35
  36 enum cm_event_types {
  37         CM_EVENT_UNKNOWN = 0,
  38         CM_EVENT_BATT_FULL,
  39         CM_EVENT_BATT_IN,
  40         CM_EVENT_BATT_OUT,
  41         CM_EVENT_BATT_OVERHEAT,
  42         CM_EVENT_BATT_COLD,
  43         CM_EVENT_EXT_PWR_IN_OUT,
  44         CM_EVENT_CHG_START_STOP,
  45         CM_EVENT_OTHERS,
  46 };
  47
  48 /**
  49  * struct charger_cable
  50  * @extcon_name: the name of extcon device.
  51  * @name: the name of charger cable(external connector).
  52  * @extcon_dev: the extcon device.
  53  * @wq: the workqueue to control charger according to the state of
  54  *      charger cable. If charger cable is attached, enable charger.
  55  *      But if charger cable is detached, disable charger.
  56  * @nb: the notifier block to receive changed state from EXTCON
  57  *      (External Connector) when charger cable is attached/detached.
  58  * @attached: the state of charger cable.
  59  *      true: the charger cable is attached
  60  *      false: the charger cable is detached
  61  * @charger: the instance of struct charger_regulator.
  62  * @cm: the Charger Manager representing the battery.
  63  */
  64 struct charger_cable {
  65         const char *extcon_name;
  66         const char *name;
  67
  68         /* The charger-manager use Exton framework*/
  69         struct extcon_specific_cable_nb extcon_dev;
  70         struct work_struct wq;
  71         struct notifier_block nb;
  72
  73         /* The state of charger cable */
  74         bool attached;
  75
  76         struct charger_regulator *charger;
  77
  78         /*
  79          * Set min/max current of regulator to protect over-current issue
  80          * according to a kind of charger cable when cable is attached.
  81          */
  82         int min_uA;
  83         int max_uA;
  84
  85         struct charger_manager *cm;
  86 };
  87
  88 /**
  89  * struct charger_regulator
  90  * @regulator_name: the name of regulator for using charger.
  91  * @consumer: the regulator consumer for the charger.
  92  * @externally_control:
  93  *      Set if the charger-manager cannot control charger,
  94  *      the charger will be maintained with disabled state.
  95  * @cables:
  96  *      the array of charger cables to enable/disable charger
  97  *      and set current limit according to constratint data of
  98  *      struct charger_cable if only charger cable included
  99  *      in the array of charger cables is attached/detached.
 100  * @num_cables: the number of charger cables.
 101  * @attr_g: Attribute group for the charger(regulator)
 102  * @attr_name: "name" sysfs entry
 103  * @attr_state: "state" sysfs entry
 104  * @attr_externally_control: "externally_control" sysfs entry
 105  * @attrs: Arrays pointing to attr_name/state/externally_control for attr_g
 106  */
 107 struct charger_regulator {
 108         /* The name of regulator for charging */
 109         const char *regulator_name;
 110         struct regulator *consumer;
 111
 112         /* charger never on when system is on */
 113         int externally_control;
 114
 115         /*
 116          * Store constraint information related to current limit,
 117          * each cable have different condition for charging.
 118          */
 119         struct charger_cable *cables;
 120         int num_cables;
 121
 122         struct attribute_group attr_g;
 123         struct device_attribute attr_name;
 124         struct device_attribute attr_state;
 125         struct device_attribute attr_externally_control;
 126         struct attribute *attrs[4];
 127
 128         struct charger_manager *cm;
 129 };
 130
 131 /**
 132  * struct charger_desc
 133  * @psy_name: the name of power-supply-class for charger manager
 134  * @polling_mode:
 135  *      Determine which polling mode will be used
 136  * @fullbatt_vchkdrop_ms:
 137  * @fullbatt_vchkdrop_uV:
 138  *      Check voltage drop after the battery is fully charged.
 139  *      If it has dropped more than fullbatt_vchkdrop_uV after
 140  *      fullbatt_vchkdrop_ms, CM will restart charging.
 141  * @fullbatt_uV: voltage in microvolt
 142  *      If VBATT >= fullbatt_uV, it is assumed to be full.
 143  * @fullbatt_soc: state of Charge in %
 144  *      If state of Charge >= fullbatt_soc, it is assumed to be full.
 145  * @fullbatt_full_capacity: full capacity measure
 146  *      If full capacity of battery >= fullbatt_full_capacity,
 147  *      it is assumed to be full.
 148  * @polling_interval_ms: interval in millisecond at which
 149  *      charger manager will monitor battery health
 150  * @battery_present:
 151  *      Specify where information for existance of battery can be obtained
 152  * @psy_charger_stat: the names of power-supply for chargers
 153  * @num_charger_regulator: the number of entries in charger_regulators
 154  * @charger_regulators: array of charger regulators
 155  * @psy_fuel_gauge: the name of power-supply for fuel gauge
 156  * @thermal_zone : the name of thermal zone for battery
 157  * @temp_min : Minimum battery temperature for charging.
 158  * @temp_max : Maximum battery temperature for charging.
 159  * @temp_diff : Temperature diffential to restart charging.
 160  * @measure_battery_temp:
 161  *      true: measure battery temperature
 162  *      false: measure ambient temperature
 163  * @charging_max_duration_ms: Maximum possible duration for charging
 164  *      If whole charging duration exceed 'charging_max_duration_ms',
 165  *      cm stop charging.
 166  * @discharging_max_duration_ms:
 167  *      Maximum possible duration for discharging with charger cable
 168  *      after full-batt. If discharging duration exceed 'discharging
 169  *      max_duration_ms', cm start charging.
 170  */
 171 struct charger_desc {
 172         const char *psy_name;
 173
 174         enum polling_modes polling_mode;
 175         unsigned int polling_interval_ms;
 176
 177         unsigned int fullbatt_vchkdrop_ms;
 178         unsigned int fullbatt_vchkdrop_uV;
 179         unsigned int fullbatt_uV;
 180         unsigned int fullbatt_soc;
 181         unsigned int fullbatt_full_capacity;
 182
 183         enum data_source battery_present;
 184
 185         const char **psy_charger_stat;
 186
 187         int num_charger_regulators;
 188         struct charger_regulator *charger_regulators;
 189
 190         const char *psy_fuel_gauge;
 191
 192         const char *thermal_zone;
 193
 194         int temp_min;
 195         int temp_max;
 196         int temp_diff;
 197
 198         bool measure_battery_temp;
 199
 200         u32 charging_max_duration_ms;
 201         u32 discharging_max_duration_ms;
 202 };
 203
 204 #define PSY_NAME_MAX    30
 205
 206 /**
 207  * struct charger_manager
 208  * @entry: entry for list
 209  * @dev: device pointer
 210  * @desc: instance of charger_desc
 211  * @fuel_gauge: power_supply for fuel gauge
 212  * @charger_stat: array of power_supply for chargers
 213  * @tzd_batt : thermal zone device for battery
 214  * @charger_enabled: the state of charger
 215  * @fullbatt_vchk_jiffies_at:
 216  *      jiffies at the time full battery check will occur.
 217  * @fullbatt_vchk_work: work queue for full battery check
 218  * @emergency_stop:
 219  *      When setting true, stop charging
 220  * @psy_name_buf: the name of power-supply-class for charger manager
 221  * @charger_psy: power_supply for charger manager
 222  * @status_save_ext_pwr_inserted:
 223  *      saved status of external power before entering suspend-to-RAM
 224  * @status_save_batt:
 225  *      saved status of battery before entering suspend-to-RAM
 226  * @charging_start_time: saved start time of enabling charging
 227  * @charging_end_time: saved end time of disabling charging
 228  */
 229 struct charger_manager {
 230         struct list_head entry;
 231         struct device *dev;
 232         struct charger_desc *desc;
 233
 234 #ifdef CONFIG_THERMAL
 235         struct thermal_zone_device *tzd_batt;
 236 #endif
 237         bool charger_enabled;
 238
 239         unsigned long fullbatt_vchk_jiffies_at;
 240         struct delayed_work fullbatt_vchk_work;
 241
 242         int emergency_stop;
 243
 244         char psy_name_buf[PSY_NAME_MAX + 1];
 245         struct power_supply_desc charger_psy_desc;
 246         struct power_supply *charger_psy;
 247
 248         u64 charging_start_time;
 249         u64 charging_end_time;
 250 };
 251
 252 #ifdef CONFIG_CHARGER_MANAGER
 253 extern void cm_notify_event(struct power_supply *psy,
 254                                 enum cm_event_types type, char *msg);
 255 #else
 256 static inline void cm_notify_event(struct power_supply *psy,
 257                                 enum cm_event_types type, char *msg) { }
 258 #endif
 259 #endif /* _CHARGER_MANAGER_H */