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
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
|
/*
* Power supply driver for the Active-semi ACT8945A PMIC
*
* Copyright (C) 2015 Atmel Corporation
*
* Author: Wenyou Yang <wenyou.yang@atmel.com>
*
* 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.
*
*/
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/regmap.h>
static const char *act8945a_charger_model = "ACT8945A";
static const char *act8945a_charger_manufacturer = "Active-semi";
/**
* ACT8945A Charger Register Map
*/
/* 0x70: Reserved */
#define ACT8945A_APCH_CFG 0x71
#define ACT8945A_APCH_STATUS 0x78
#define ACT8945A_APCH_CTRL 0x79
#define ACT8945A_APCH_STATE 0x7A
/* ACT8945A_APCH_CFG */
#define APCH_CFG_OVPSET (0x3 << 0)
#define APCH_CFG_OVPSET_6V6 (0x0 << 0)
#define APCH_CFG_OVPSET_7V (0x1 << 0)
#define APCH_CFG_OVPSET_7V5 (0x2 << 0)
#define APCH_CFG_OVPSET_8V (0x3 << 0)
#define APCH_CFG_PRETIMO (0x3 << 2)
#define APCH_CFG_PRETIMO_40_MIN (0x0 << 2)
#define APCH_CFG_PRETIMO_60_MIN (0x1 << 2)
#define APCH_CFG_PRETIMO_80_MIN (0x2 << 2)
#define APCH_CFG_PRETIMO_DISABLED (0x3 << 2)
#define APCH_CFG_TOTTIMO (0x3 << 4)
#define APCH_CFG_TOTTIMO_3_HOUR (0x0 << 4)
#define APCH_CFG_TOTTIMO_4_HOUR (0x1 << 4)
#define APCH_CFG_TOTTIMO_5_HOUR (0x2 << 4)
#define APCH_CFG_TOTTIMO_DISABLED (0x3 << 4)
#define APCH_CFG_SUSCHG (0x1 << 7)
#define APCH_STATUS_CHGDAT BIT(0)
#define APCH_STATUS_INDAT BIT(1)
#define APCH_STATUS_TEMPDAT BIT(2)
#define APCH_STATUS_TIMRDAT BIT(3)
#define APCH_STATUS_CHGSTAT BIT(4)
#define APCH_STATUS_INSTAT BIT(5)
#define APCH_STATUS_TEMPSTAT BIT(6)
#define APCH_STATUS_TIMRSTAT BIT(7)
#define APCH_CTRL_CHGEOCOUT BIT(0)
#define APCH_CTRL_INDIS BIT(1)
#define APCH_CTRL_TEMPOUT BIT(2)
#define APCH_CTRL_TIMRPRE BIT(3)
#define APCH_CTRL_CHGEOCIN BIT(4)
#define APCH_CTRL_INCON BIT(5)
#define APCH_CTRL_TEMPIN BIT(6)
#define APCH_CTRL_TIMRTOT BIT(7)
#define APCH_STATE_ACINSTAT (0x1 << 1)
#define APCH_STATE_CSTATE (0x3 << 4)
#define APCH_STATE_CSTATE_SHIFT 4
#define APCH_STATE_CSTATE_DISABLED 0x00
#define APCH_STATE_CSTATE_EOC 0x01
#define APCH_STATE_CSTATE_FAST 0x02
#define APCH_STATE_CSTATE_PRE 0x03
struct act8945a_charger {
struct regmap *regmap;
};
static int act8945a_get_charger_state(struct regmap *regmap, int *val)
{
int ret;
unsigned int status, state;
ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
if (ret < 0)
return ret;
ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
if (ret < 0)
return ret;
state &= APCH_STATE_CSTATE;
state >>= APCH_STATE_CSTATE_SHIFT;
if (state == APCH_STATE_CSTATE_EOC) {
if (status & APCH_STATUS_CHGDAT)
*val = POWER_SUPPLY_STATUS_FULL;
else
*val = POWER_SUPPLY_STATUS_NOT_CHARGING;
} else if ((state == APCH_STATE_CSTATE_FAST) ||
(state == APCH_STATE_CSTATE_PRE)) {
*val = POWER_SUPPLY_STATUS_CHARGING;
} else {
*val = POWER_SUPPLY_STATUS_NOT_CHARGING;
}
return 0;
}
static int act8945a_get_charge_type(struct regmap *regmap, int *val)
{
int ret;
unsigned int state;
ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
if (ret < 0)
return ret;
state &= APCH_STATE_CSTATE;
state >>= APCH_STATE_CSTATE_SHIFT;
switch (state) {
case APCH_STATE_CSTATE_PRE:
*val = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
break;
case APCH_STATE_CSTATE_FAST:
*val = POWER_SUPPLY_CHARGE_TYPE_FAST;
break;
case APCH_STATE_CSTATE_EOC:
case APCH_STATE_CSTATE_DISABLED:
default:
*val = POWER_SUPPLY_CHARGE_TYPE_NONE;
}
return 0;
}
static int act8945a_get_battery_health(struct regmap *regmap, int *val)
{
int ret;
unsigned int status;
ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
if (ret < 0)
return ret;
if (!(status & APCH_STATUS_TEMPDAT))
*val = POWER_SUPPLY_HEALTH_OVERHEAT;
else if (!(status & APCH_STATUS_INDAT))
*val = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
else if (status & APCH_STATUS_TIMRDAT)
*val = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
else
*val = POWER_SUPPLY_HEALTH_GOOD;
return 0;
}
static enum power_supply_property act8945a_charger_props[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_CHARGE_TYPE,
POWER_SUPPLY_PROP_TECHNOLOGY,
POWER_SUPPLY_PROP_HEALTH,
POWER_SUPPLY_PROP_MODEL_NAME,
POWER_SUPPLY_PROP_MANUFACTURER
};
static int act8945a_charger_get_property(struct power_supply *psy,
enum power_supply_property prop,
union power_supply_propval *val)
{
struct act8945a_charger *charger = power_supply_get_drvdata(psy);
struct regmap *regmap = charger->regmap;
int ret = 0;
switch (prop) {
case POWER_SUPPLY_PROP_STATUS:
ret = act8945a_get_charger_state(regmap, &val->intval);
break;
case POWER_SUPPLY_PROP_CHARGE_TYPE:
ret = act8945a_get_charge_type(regmap, &val->intval);
break;
case POWER_SUPPLY_PROP_TECHNOLOGY:
val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
break;
case POWER_SUPPLY_PROP_HEALTH:
ret = act8945a_get_battery_health(regmap, &val->intval);
break;
case POWER_SUPPLY_PROP_MODEL_NAME:
val->strval = act8945a_charger_model;
break;
case POWER_SUPPLY_PROP_MANUFACTURER:
val->strval = act8945a_charger_manufacturer;
break;
default:
return -EINVAL;
}
return ret;
}
static const struct power_supply_desc act8945a_charger_desc = {
.name = "act8945a-charger",
.type = POWER_SUPPLY_TYPE_BATTERY,
.get_property = act8945a_charger_get_property,
.properties = act8945a_charger_props,
.num_properties = ARRAY_SIZE(act8945a_charger_props),
};
#define DEFAULT_TOTAL_TIME_OUT 3
#define DEFAULT_PRE_TIME_OUT 40
#define DEFAULT_INPUT_OVP_THRESHOLD 6600
static int act8945a_charger_config(struct device *dev,
struct act8945a_charger *charger)
{
struct device_node *np = dev->of_node;
enum of_gpio_flags flags;
struct regmap *regmap = charger->regmap;
u32 total_time_out;
u32 pre_time_out;
u32 input_voltage_threshold;
int chglev_pin;
unsigned int value = 0;
if (!np) {
dev_err(dev, "no charger of node\n");
return -EINVAL;
}
chglev_pin = of_get_named_gpio_flags(np,
"active-semi,chglev-gpios", 0, &flags);
if (gpio_is_valid(chglev_pin)) {
gpio_set_value(chglev_pin,
((flags == OF_GPIO_ACTIVE_LOW) ? 0 : 1));
}
if (of_property_read_u32(np,
"active-semi,input-voltage-threshold-microvolt",
&input_voltage_threshold))
input_voltage_threshold = DEFAULT_INPUT_OVP_THRESHOLD;
if (of_property_read_u32(np,
"active-semi,precondition-timeout",
&pre_time_out))
pre_time_out = DEFAULT_PRE_TIME_OUT;
if (of_property_read_u32(np, "active-semi,total-timeout",
&total_time_out))
total_time_out = DEFAULT_TOTAL_TIME_OUT;
switch (input_voltage_threshold) {
case 8000:
value |= APCH_CFG_OVPSET_8V;
break;
case 7500:
value |= APCH_CFG_OVPSET_7V5;
break;
case 7000:
value |= APCH_CFG_OVPSET_7V;
break;
case 6600:
default:
value |= APCH_CFG_OVPSET_6V6;
break;
}
switch (pre_time_out) {
case 60:
value |= APCH_CFG_PRETIMO_60_MIN;
break;
case 80:
value |= APCH_CFG_PRETIMO_80_MIN;
break;
case 0:
value |= APCH_CFG_PRETIMO_DISABLED;
break;
case 40:
default:
value |= APCH_CFG_PRETIMO_40_MIN;
break;
}
switch (total_time_out) {
case 4:
value |= APCH_CFG_TOTTIMO_4_HOUR;
break;
case 5:
value |= APCH_CFG_TOTTIMO_5_HOUR;
break;
case 0:
value |= APCH_CFG_TOTTIMO_DISABLED;
break;
case 3:
default:
value |= APCH_CFG_TOTTIMO_3_HOUR;
break;
}
return regmap_write(regmap, ACT8945A_APCH_CFG, value);
}
static int act8945a_charger_probe(struct platform_device *pdev)
{
struct act8945a_charger *charger;
struct power_supply *psy;
struct power_supply_config psy_cfg = {};
int ret;
charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
if (!charger)
return -ENOMEM;
charger->regmap = dev_get_regmap(pdev->dev.parent, NULL);
if (!charger->regmap) {
dev_err(&pdev->dev, "Parent did not provide regmap\n");
return -EINVAL;
}
ret = act8945a_charger_config(&pdev->dev, charger);
if (ret)
return ret;
psy_cfg.of_node = pdev->dev.of_node;
psy_cfg.drv_data = charger;
psy = devm_power_supply_register(&pdev->dev,
&act8945a_charger_desc,
&psy_cfg);
if (IS_ERR(psy)) {
dev_err(&pdev->dev, "failed to register power supply\n");
return PTR_ERR(psy);
}
return 0;
}
static struct platform_driver act8945a_charger_driver = {
.driver = {
.name = "act8945a-charger",
},
.probe = act8945a_charger_probe,
};
module_platform_driver(act8945a_charger_driver);
MODULE_DESCRIPTION("Active-semi ACT8945A ActivePath charger driver");
MODULE_AUTHOR("Wenyou Yang <wenyou.yang@atmel.com>");
MODULE_LICENSE("GPL");
|
