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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 */