summaryrefslogtreecommitdiff
path: root/include/linux/power/charger-manager.h
blob: 7d7b90fb7b4b4f9f000f4977ba4705645f992144 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
/*
 * Copyright (C) 2011 Samsung Electronics Co., Ltd.
 * MyungJoo.Ham <myungjoo.ham@samsung.com>
 *
 * Charger Manager.
 * This framework enables to control and multiple chargers and to
 * monitor charging even in the context of suspend-to-RAM with
 * an interface combining the chargers.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
**/

#ifndef _CHARGER_MANAGER_H
#define _CHARGER_MANAGER_H

#include <linux/power_supply.h>
#include <linux/extcon.h>

enum data_source {
	CM_BATTERY_PRESENT,
	CM_NO_BATTERY,
	CM_FUEL_GAUGE,
	CM_CHARGER_STAT,
};

enum polling_modes {
	CM_POLL_DISABLE = 0,
	CM_POLL_ALWAYS,
	CM_POLL_EXTERNAL_POWER_ONLY,
	CM_POLL_CHARGING_ONLY,
};

enum cm_event_types {
	CM_EVENT_UNKNOWN = 0,
	CM_EVENT_BATT_FULL,
	CM_EVENT_BATT_IN,
	CM_EVENT_BATT_OUT,
	CM_EVENT_EXT_PWR_IN_OUT,
	CM_EVENT_CHG_START_STOP,
	CM_EVENT_OTHERS,
};

/**
 * struct charger_global_desc
 * @rtc_name: the name of RTC used to wake up the system from suspend.
 * @rtc_only_wakeup:
 *	If the system is woken up by waekup-sources other than the RTC or
 *	callbacks, Charger Manager should recognize with
 *	rtc_only_wakeup() returning false.
 *	If the RTC given to CM is the only wakeup reason,
 *	rtc_only_wakeup should return true.
 * @assume_timer_stops_in_suspend:
 *	Assume that the jiffy timer stops in suspend-to-RAM.
 *	When enabled, CM does not rely on jiffies value in
 *	suspend_again and assumes that jiffies value does not
 *	change during suspend.
 */
struct charger_global_desc {
	char *rtc_name;

	bool (*rtc_only_wakeup)(void);

	bool assume_timer_stops_in_suspend;
};

/**
 * struct charger_cable
 * @extcon_name: the name of extcon device.
 * @name: the name of charger cable(external connector).
 * @extcon_dev: the extcon device.
 * @wq: the workqueue to control charger according to the state of
 *	charger cable. If charger cable is attached, enable charger.
 *	But if charger cable is detached, disable charger.
 * @nb: the notifier block to receive changed state from EXTCON
 *	(External Connector) when charger cable is attached/detached.
 * @attached: the state of charger cable.
 *	true: the charger cable is attached
 *	false: the charger cable is detached
 * @charger: the instance of struct charger_regulator.
 * @cm: the Charger Manager representing the battery.
 */
struct charger_cable {
	const char *extcon_name;
	const char *name;

	/* The charger-manager use Exton framework*/
	struct extcon_specific_cable_nb extcon_dev;
	struct work_struct wq;
	struct notifier_block nb;

	/* The state of charger cable */
	bool attached;

	struct charger_regulator *charger;

	/*
	 * Set min/max current of regulator to protect over-current issue
	 * according to a kind of charger cable when cable is attached.
	 */
	int min_uA;
	int max_uA;

	struct charger_manager *cm;
};

/**
 * struct charger_regulator
 * @regulator_name: the name of regulator for using charger.
 * @consumer: the regulator consumer for the charger.
 * @cables:
 *	the array of charger cables to enable/disable charger
 *	and set current limit according to constratint data of
 *	struct charger_cable if only charger cable included
 *	in the array of charger cables is attached/detached.
 * @num_cables: the number of charger cables.
 */
struct charger_regulator {
	/* The name of regulator for charging */
	const char *regulator_name;
	struct regulator *consumer;

	/*
	 * Store constraint information related to current limit,
	 * each cable have different condition for charging.
	 */
	struct charger_cable *cables;
	int num_cables;
};

/**
 * struct charger_desc
 * @psy_name: the name of power-supply-class for charger manager
 * @polling_mode:
 *	Determine which polling mode will be used
 * @fullbatt_vchkdrop_ms:
 * @fullbatt_vchkdrop_uV:
 *	Check voltage drop after the battery is fully charged.
 *	If it has dropped more than fullbatt_vchkdrop_uV after
 *	fullbatt_vchkdrop_ms, CM will restart charging.
 * @fullbatt_uV: voltage in microvolt
 *	If it is not being charged and VBATT >= fullbatt_uV,
 *	it is assumed to be full.
 * @polling_interval_ms: interval in millisecond at which
 *	charger manager will monitor battery health
 * @battery_present:
 *	Specify where information for existance of battery can be obtained
 * @psy_charger_stat: the names of power-supply for chargers
 * @num_charger_regulator: the number of entries in charger_regulators
 * @charger_regulators: array of regulator_bulk_data for chargers
 * @psy_fuel_gauge: the name of power-supply for fuel gauge
 * @temperature_out_of_range:
 *	Determine whether the status is overheat or cold or normal.
 *	return_value > 0: overheat
 *	return_value == 0: normal
 *	return_value < 0: cold
 * @measure_battery_temp:
 *	true: measure battery temperature
 *	false: measure ambient temperature
 */
struct charger_desc {
	char *psy_name;

	enum polling_modes polling_mode;
	unsigned int polling_interval_ms;

	unsigned int fullbatt_vchkdrop_ms;
	unsigned int fullbatt_vchkdrop_uV;
	unsigned int fullbatt_uV;

	enum data_source battery_present;

	char **psy_charger_stat;

	int num_charger_regulators;
	struct charger_regulator *charger_regulators;

	char *psy_fuel_gauge;

	int (*temperature_out_of_range)(int *mC);
	bool measure_battery_temp;
};

#define PSY_NAME_MAX	30

/**
 * struct charger_manager
 * @entry: entry for list
 * @dev: device pointer
 * @desc: instance of charger_desc
 * @fuel_gauge: power_supply for fuel gauge
 * @charger_stat: array of power_supply for chargers
 * @charger_enabled: the state of charger
 * @fullbatt_vchk_jiffies_at:
 *	jiffies at the time full battery check will occur.
 * @fullbatt_vchk_work: work queue for full battery check
 * @emergency_stop:
 *	When setting true, stop charging
 * @last_temp_mC: the measured temperature in milli-Celsius
 * @psy_name_buf: the name of power-supply-class for charger manager
 * @charger_psy: power_supply for charger manager
 * @status_save_ext_pwr_inserted:
 *	saved status of external power before entering suspend-to-RAM
 * @status_save_batt:
 *	saved status of battery before entering suspend-to-RAM
 */
struct charger_manager {
	struct list_head entry;
	struct device *dev;
	struct charger_desc *desc;

	struct power_supply *fuel_gauge;
	struct power_supply **charger_stat;

	bool charger_enabled;

	unsigned long fullbatt_vchk_jiffies_at;
	struct delayed_work fullbatt_vchk_work;

	int emergency_stop;
	int last_temp_mC;

	char psy_name_buf[PSY_NAME_MAX + 1];
	struct power_supply charger_psy;

	bool status_save_ext_pwr_inserted;
	bool status_save_batt;
};

#ifdef CONFIG_CHARGER_MANAGER
extern int setup_charger_manager(struct charger_global_desc *gd);
extern bool cm_suspend_again(void);
extern void cm_notify_event(struct power_supply *psy,
				enum cm_event_types type, char *msg);
#else
static inline int setup_charger_manager(struct charger_global_desc *gd)
{ return 0; }
static inline bool cm_suspend_again(void) { return false; }
static inline void cm_notify_event(struct power_supply *psy,
				enum cm_event_types type, char *msg) { }
#endif
#endif /* _CHARGER_MANAGER_H */