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
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
|
// SPDX-License-Identifier: GPL-2.0
//
// Copyright (C) 2018 BayLibre SAS
// Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
//
// Battery charger driver for MAXIM 77650/77651 charger/power-supply.
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/mfd/max77650.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/regmap.h>
#define MAX77650_CHARGER_ENABLED BIT(0)
#define MAX77650_CHARGER_DISABLED 0x00
#define MAX77650_CHARGER_CHG_EN_MASK BIT(0)
#define MAX77650_CHG_DETAILS_MASK GENMASK(7, 4)
#define MAX77650_CHG_DETAILS_BITS(_reg) \
(((_reg) & MAX77650_CHG_DETAILS_MASK) >> 4)
/* Charger is OFF. */
#define MAX77650_CHG_OFF 0x00
/* Charger is in prequalification mode. */
#define MAX77650_CHG_PREQ 0x01
/* Charger is in fast-charge constant current mode. */
#define MAX77650_CHG_ON_CURR 0x02
/* Charger is in JEITA modified fast-charge constant-current mode. */
#define MAX77650_CHG_ON_CURR_JEITA 0x03
/* Charger is in fast-charge constant-voltage mode. */
#define MAX77650_CHG_ON_VOLT 0x04
/* Charger is in JEITA modified fast-charge constant-voltage mode. */
#define MAX77650_CHG_ON_VOLT_JEITA 0x05
/* Charger is in top-off mode. */
#define MAX77650_CHG_ON_TOPOFF 0x06
/* Charger is in JEITA modified top-off mode. */
#define MAX77650_CHG_ON_TOPOFF_JEITA 0x07
/* Charger is done. */
#define MAX77650_CHG_DONE 0x08
/* Charger is JEITA modified done. */
#define MAX77650_CHG_DONE_JEITA 0x09
/* Charger is suspended due to a prequalification timer fault. */
#define MAX77650_CHG_SUSP_PREQ_TIM_FAULT 0x0a
/* Charger is suspended due to a fast-charge timer fault. */
#define MAX77650_CHG_SUSP_FAST_CHG_TIM_FAULT 0x0b
/* Charger is suspended due to a battery temperature fault. */
#define MAX77650_CHG_SUSP_BATT_TEMP_FAULT 0x0c
#define MAX77650_CHGIN_DETAILS_MASK GENMASK(3, 2)
#define MAX77650_CHGIN_DETAILS_BITS(_reg) \
(((_reg) & MAX77650_CHGIN_DETAILS_MASK) >> 2)
#define MAX77650_CHGIN_UNDERVOLTAGE_LOCKOUT 0x00
#define MAX77650_CHGIN_OVERVOLTAGE_LOCKOUT 0x01
#define MAX77650_CHGIN_OKAY 0x11
#define MAX77650_CHARGER_CHG_MASK BIT(1)
#define MAX77650_CHARGER_CHG_CHARGING(_reg) \
(((_reg) & MAX77650_CHARGER_CHG_MASK) > 1)
#define MAX77650_CHARGER_VCHGIN_MIN_MASK 0xc0
#define MAX77650_CHARGER_VCHGIN_MIN_SHIFT(_val) ((_val) << 5)
#define MAX77650_CHARGER_ICHGIN_LIM_MASK 0x1c
#define MAX77650_CHARGER_ICHGIN_LIM_SHIFT(_val) ((_val) << 2)
struct max77650_charger_data {
struct regmap *map;
struct device *dev;
};
static enum power_supply_property max77650_charger_properties[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_ONLINE,
POWER_SUPPLY_PROP_CHARGE_TYPE
};
static const unsigned int max77650_charger_vchgin_min_table[] = {
4000000, 4100000, 4200000, 4300000, 4400000, 4500000, 4600000, 4700000
};
static const unsigned int max77650_charger_ichgin_lim_table[] = {
95000, 190000, 285000, 380000, 475000
};
static int max77650_charger_set_vchgin_min(struct max77650_charger_data *chg,
unsigned int val)
{
int i, rv;
for (i = 0; i < ARRAY_SIZE(max77650_charger_vchgin_min_table); i++) {
if (val == max77650_charger_vchgin_min_table[i]) {
rv = regmap_update_bits(chg->map,
MAX77650_REG_CNFG_CHG_B,
MAX77650_CHARGER_VCHGIN_MIN_MASK,
MAX77650_CHARGER_VCHGIN_MIN_SHIFT(i));
if (rv)
return rv;
return 0;
}
}
return -EINVAL;
}
static int max77650_charger_set_ichgin_lim(struct max77650_charger_data *chg,
unsigned int val)
{
int i, rv;
for (i = 0; i < ARRAY_SIZE(max77650_charger_ichgin_lim_table); i++) {
if (val == max77650_charger_ichgin_lim_table[i]) {
rv = regmap_update_bits(chg->map,
MAX77650_REG_CNFG_CHG_B,
MAX77650_CHARGER_ICHGIN_LIM_MASK,
MAX77650_CHARGER_ICHGIN_LIM_SHIFT(i));
if (rv)
return rv;
return 0;
}
}
return -EINVAL;
}
static int max77650_charger_enable(struct max77650_charger_data *chg)
{
int rv;
rv = regmap_update_bits(chg->map,
MAX77650_REG_CNFG_CHG_B,
MAX77650_CHARGER_CHG_EN_MASK,
MAX77650_CHARGER_ENABLED);
if (rv)
dev_err(chg->dev, "unable to enable the charger: %d\n", rv);
return rv;
}
static int max77650_charger_disable(struct max77650_charger_data *chg)
{
int rv;
rv = regmap_update_bits(chg->map,
MAX77650_REG_CNFG_CHG_B,
MAX77650_CHARGER_CHG_EN_MASK,
MAX77650_CHARGER_DISABLED);
if (rv)
dev_err(chg->dev, "unable to disable the charger: %d\n", rv);
return rv;
}
static irqreturn_t max77650_charger_check_status(int irq, void *data)
{
struct max77650_charger_data *chg = data;
int rv, reg;
rv = regmap_read(chg->map, MAX77650_REG_STAT_CHG_B, ®);
if (rv) {
dev_err(chg->dev,
"unable to read the charger status: %d\n", rv);
return IRQ_HANDLED;
}
switch (MAX77650_CHGIN_DETAILS_BITS(reg)) {
case MAX77650_CHGIN_UNDERVOLTAGE_LOCKOUT:
dev_err(chg->dev, "undervoltage lockout detected, disabling charger\n");
max77650_charger_disable(chg);
break;
case MAX77650_CHGIN_OVERVOLTAGE_LOCKOUT:
dev_err(chg->dev, "overvoltage lockout detected, disabling charger\n");
max77650_charger_disable(chg);
break;
case MAX77650_CHGIN_OKAY:
max77650_charger_enable(chg);
break;
default:
/* May be 0x10 - debouncing */
break;
}
return IRQ_HANDLED;
}
static int max77650_charger_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct max77650_charger_data *chg = power_supply_get_drvdata(psy);
int rv, reg;
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
rv = regmap_read(chg->map, MAX77650_REG_STAT_CHG_B, ®);
if (rv)
return rv;
if (MAX77650_CHARGER_CHG_CHARGING(reg)) {
val->intval = POWER_SUPPLY_STATUS_CHARGING;
break;
}
switch (MAX77650_CHG_DETAILS_BITS(reg)) {
case MAX77650_CHG_OFF:
case MAX77650_CHG_SUSP_PREQ_TIM_FAULT:
case MAX77650_CHG_SUSP_FAST_CHG_TIM_FAULT:
case MAX77650_CHG_SUSP_BATT_TEMP_FAULT:
val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
break;
case MAX77650_CHG_PREQ:
case MAX77650_CHG_ON_CURR:
case MAX77650_CHG_ON_CURR_JEITA:
case MAX77650_CHG_ON_VOLT:
case MAX77650_CHG_ON_VOLT_JEITA:
case MAX77650_CHG_ON_TOPOFF:
case MAX77650_CHG_ON_TOPOFF_JEITA:
val->intval = POWER_SUPPLY_STATUS_CHARGING;
break;
case MAX77650_CHG_DONE:
val->intval = POWER_SUPPLY_STATUS_FULL;
break;
default:
val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
}
break;
case POWER_SUPPLY_PROP_ONLINE:
rv = regmap_read(chg->map, MAX77650_REG_STAT_CHG_B, ®);
if (rv)
return rv;
val->intval = MAX77650_CHARGER_CHG_CHARGING(reg);
break;
case POWER_SUPPLY_PROP_CHARGE_TYPE:
rv = regmap_read(chg->map, MAX77650_REG_STAT_CHG_B, ®);
if (rv)
return rv;
if (!MAX77650_CHARGER_CHG_CHARGING(reg)) {
val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
break;
}
switch (MAX77650_CHG_DETAILS_BITS(reg)) {
case MAX77650_CHG_PREQ:
case MAX77650_CHG_ON_CURR:
case MAX77650_CHG_ON_CURR_JEITA:
case MAX77650_CHG_ON_VOLT:
case MAX77650_CHG_ON_VOLT_JEITA:
val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
break;
case MAX77650_CHG_ON_TOPOFF:
case MAX77650_CHG_ON_TOPOFF_JEITA:
val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
break;
default:
val->intval = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
}
break;
default:
return -EINVAL;
}
return 0;
}
static const struct power_supply_desc max77650_battery_desc = {
.name = "max77650",
.type = POWER_SUPPLY_TYPE_USB,
.get_property = max77650_charger_get_property,
.properties = max77650_charger_properties,
.num_properties = ARRAY_SIZE(max77650_charger_properties),
};
static int max77650_charger_probe(struct platform_device *pdev)
{
struct power_supply_config pscfg = {};
struct max77650_charger_data *chg;
struct power_supply *battery;
struct device *dev, *parent;
int rv, chg_irq, chgin_irq;
unsigned int prop;
dev = &pdev->dev;
parent = dev->parent;
chg = devm_kzalloc(dev, sizeof(*chg), GFP_KERNEL);
if (!chg)
return -ENOMEM;
platform_set_drvdata(pdev, chg);
chg->map = dev_get_regmap(parent, NULL);
if (!chg->map)
return -ENODEV;
chg->dev = dev;
pscfg.of_node = dev->of_node;
pscfg.drv_data = chg;
chg_irq = platform_get_irq_byname(pdev, "CHG");
if (chg_irq < 0)
return chg_irq;
chgin_irq = platform_get_irq_byname(pdev, "CHGIN");
if (chgin_irq < 0)
return chgin_irq;
rv = devm_request_any_context_irq(dev, chg_irq,
max77650_charger_check_status,
IRQF_ONESHOT, "chg", chg);
if (rv < 0)
return rv;
rv = devm_request_any_context_irq(dev, chgin_irq,
max77650_charger_check_status,
IRQF_ONESHOT, "chgin", chg);
if (rv < 0)
return rv;
battery = devm_power_supply_register(dev,
&max77650_battery_desc, &pscfg);
if (IS_ERR(battery))
return PTR_ERR(battery);
rv = of_property_read_u32(dev->of_node,
"input-voltage-min-microvolt", &prop);
if (rv == 0) {
rv = max77650_charger_set_vchgin_min(chg, prop);
if (rv)
return rv;
}
rv = of_property_read_u32(dev->of_node,
"input-current-limit-microamp", &prop);
if (rv == 0) {
rv = max77650_charger_set_ichgin_lim(chg, prop);
if (rv)
return rv;
}
return max77650_charger_enable(chg);
}
static int max77650_charger_remove(struct platform_device *pdev)
{
struct max77650_charger_data *chg = platform_get_drvdata(pdev);
return max77650_charger_disable(chg);
}
static struct platform_driver max77650_charger_driver = {
.driver = {
.name = "max77650-charger",
},
.probe = max77650_charger_probe,
.remove = max77650_charger_remove,
};
module_platform_driver(max77650_charger_driver);
MODULE_DESCRIPTION("MAXIM 77650/77651 charger driver");
MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
MODULE_LICENSE("GPL v2");
|
