Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
power: supply: max77759: add charger driver
Add support for MAX77759 battery charger driver. This is a 4A 1-Cell
Li+/LiPoly dual input switch mode charger. While the device can support
USB & wireless charger inputs, this implementation only supports USB
input. This implementation supports both buck and boost modes.
Signed-off-by: Amit Sunil Dhamne <amitsd@google.com>
Reviewed-by: André Draszik <andre.draszik@linaro.org>
Link: https://patch.msgid.link/20260325-max77759-charger-v9-5-4486dd297adc@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
authored by
Amit Sunil Dhamne
and committed by
Greg Kroah-Hartman
70d7dd27
f23388d0
+792
+6
MAINTAINERS
+6
MAINTAINERS
···
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F: drivers/nvmem/max77759-nvmem.c
15709
15709
F: include/linux/mfd/max77759.h
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+
MAXIM MAX77759 BATTERY CHARGER DRIVER
15712
+
M: Amit Sunil Dhamne <amitsd@google.com>
15713
+
L: linux-kernel@vger.kernel.org
15714
+
S: Maintained
15715
+
F: drivers/power/supply/max77759_charger.c
15716
+
15711
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MAXIM MAX77802 PMIC REGULATOR DEVICE DRIVER
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M: Javier Martinez Canillas <javier@dowhile0.org>
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L: linux-kernel@vger.kernel.org
+11
drivers/power/supply/Kconfig
+11
drivers/power/supply/Kconfig
···
631
631
help
632
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Say Y to enable support for the Maxim MAX77705 battery charger.
633
633
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+
config CHARGER_MAX77759
635
+
tristate "Maxim MAX77759 battery charger driver"
636
+
depends on MFD_MAX77759 && REGULATOR
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+
default MFD_MAX77759
638
+
help
639
+
Say M or Y here to enable the MAX77759 battery charger. MAX77759
640
+
charger is a function of the MAX77759 PMIC. This is a dual input
641
+
switch-mode charger. This driver supports buck and OTG boost modes.
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+
643
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If built as a module, it will be called max77759_charger.
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+
634
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config CHARGER_MAX77976
635
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tristate "Maxim MAX77976 battery charger driver"
636
647
depends on I2C
+1
drivers/power/supply/Makefile
+1
drivers/power/supply/Makefile
+774
drivers/power/supply/max77759_charger.c
+774
drivers/power/supply/max77759_charger.c
···
1
+
// SPDX-License-Identifier: GPL-2.0-only
2
+
/*
3
+
* max77759_charger.c - Battery charger driver for MAX77759 charger device.
4
+
*
5
+
* Copyright 2025 Google LLC.
6
+
*/
7
+
8
+
#include <linux/bitfield.h>
9
+
#include <linux/cleanup.h>
10
+
#include <linux/device.h>
11
+
#include <linux/devm-helpers.h>
12
+
#include <linux/interrupt.h>
13
+
#include <linux/irq.h>
14
+
#include <linux/linear_range.h>
15
+
#include <linux/mfd/max77759.h>
16
+
#include <linux/module.h>
17
+
#include <linux/mod_devicetable.h>
18
+
#include <linux/mutex.h>
19
+
#include <linux/of.h>
20
+
#include <linux/platform_device.h>
21
+
#include <linux/power_supply.h>
22
+
#include <linux/regmap.h>
23
+
#include <linux/regulator/driver.h>
24
+
#include <linux/string_choices.h>
25
+
#include <linux/workqueue.h>
26
+
27
+
/* Default values for Fast Charge Current & Float Voltage */
28
+
#define CHG_CC_DEFAULT_UA 2266770
29
+
#define CHG_FV_DEFAULT_MV 4300
30
+
31
+
#define MAX_NUM_RETRIES 3
32
+
#define PSY_WORK_RETRY_DELAY_MS 10
33
+
34
+
#define FOREACH_IRQ(S) \
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S(AICL), \
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+
S(CHGIN), \
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S(CHG), \
38
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S(INLIM), \
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S(BAT_OILO), \
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S(CHG_STA_CC), \
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S(CHG_STA_CV), \
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S(CHG_STA_TO), \
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S(CHG_STA_DONE)
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+
45
+
#define GENERATE_ENUM(e) e
46
+
#define GENERATE_STRING(s) #s
47
+
48
+
enum {
49
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FOREACH_IRQ(GENERATE_ENUM)
50
+
};
51
+
52
+
static const char *const chgr_irqs_str[] = {
53
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FOREACH_IRQ(GENERATE_STRING)
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+
};
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+
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#define NUM_IRQS ARRAY_SIZE(chgr_irqs_str)
57
+
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+
/* Fast charge current limits (in uA) */
59
+
static const struct linear_range chgcc_limit_ranges[] = {
60
+
LINEAR_RANGE(133330, 0x0, 0x2, 0),
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LINEAR_RANGE(200000, 0x3, 0x3C, 66670),
62
+
};
63
+
64
+
/* Charge Termination Voltage Limits (in mV) */
65
+
static const struct linear_range chg_cv_prm_ranges[] = {
66
+
LINEAR_RANGE(3800, 0x38, 0x39, 100),
67
+
LINEAR_RANGE(4000, 0x0, 0x32, 10),
68
+
};
69
+
70
+
/* USB input current limits (in uA) */
71
+
static const struct linear_range chgin_ilim_ranges[] = {
72
+
LINEAR_RANGE(100000, 0x3, 0x7F, 25000),
73
+
};
74
+
75
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struct max77759_charger {
76
+
struct device *dev;
77
+
struct regmap *regmap;
78
+
struct power_supply *psy;
79
+
struct regulator_dev *chgin_otg_rdev;
80
+
struct notifier_block nb;
81
+
struct power_supply *tcpm_psy;
82
+
struct delayed_work psy_work;
83
+
struct mutex retry_lock; /* Protects psy_work_retry_cnt */
84
+
u32 psy_work_retry_cnt;
85
+
int irqs[NUM_IRQS];
86
+
struct mutex lock; /* protects the state below */
87
+
enum max77759_chgr_mode mode;
88
+
};
89
+
90
+
static inline int unlock_prot_regs(struct max77759_charger *chg, bool unlock)
91
+
{
92
+
return regmap_update_bits(chg->regmap, MAX77759_CHGR_REG_CHG_CNFG_06,
93
+
MAX77759_CHGR_REG_CHG_CNFG_06_CHGPROT, unlock
94
+
? MAX77759_CHGR_REG_CHG_CNFG_06_CHGPROT : 0);
95
+
}
96
+
97
+
static int charger_input_valid(struct max77759_charger *chg)
98
+
{
99
+
u32 val;
100
+
int ret;
101
+
102
+
ret = regmap_read(chg->regmap, MAX77759_CHGR_REG_CHG_INT_OK, &val);
103
+
if (ret)
104
+
return ret;
105
+
106
+
return (val & MAX77759_CHGR_REG_CHG_INT_CHG) &&
107
+
(val & MAX77759_CHGR_REG_CHG_INT_CHGIN);
108
+
}
109
+
110
+
static int get_online(struct max77759_charger *chg)
111
+
{
112
+
u32 val;
113
+
int ret;
114
+
115
+
ret = charger_input_valid(chg);
116
+
if (ret <= 0)
117
+
return ret;
118
+
119
+
ret = regmap_read(chg->regmap, MAX77759_CHGR_REG_CHG_DETAILS_02, &val);
120
+
if (ret)
121
+
return ret;
122
+
123
+
guard(mutex)(&chg->lock);
124
+
125
+
return (val & MAX77759_CHGR_REG_CHG_DETAILS_02_CHGIN_STS) &&
126
+
(chg->mode == MAX77759_CHGR_MODE_CHG_BUCK_ON);
127
+
}
128
+
129
+
static int get_status(struct max77759_charger *chg)
130
+
{
131
+
u32 val;
132
+
int ret;
133
+
134
+
ret = regmap_read(chg->regmap, MAX77759_CHGR_REG_CHG_DETAILS_01, &val);
135
+
if (ret)
136
+
return ret;
137
+
138
+
switch (FIELD_GET(MAX77759_CHGR_REG_CHG_DETAILS_01_CHG_DTLS, val)) {
139
+
case MAX77759_CHGR_CHG_DTLS_PREQUAL:
140
+
case MAX77759_CHGR_CHG_DTLS_CC:
141
+
case MAX77759_CHGR_CHG_DTLS_CV:
142
+
case MAX77759_CHGR_CHG_DTLS_TO:
143
+
return POWER_SUPPLY_STATUS_CHARGING;
144
+
case MAX77759_CHGR_CHG_DTLS_DONE:
145
+
return POWER_SUPPLY_STATUS_FULL;
146
+
case MAX77759_CHGR_CHG_DTLS_TIMER_FAULT:
147
+
case MAX77759_CHGR_CHG_DTLS_SUSP_BATT_THM:
148
+
case MAX77759_CHGR_CHG_DTLS_OFF_WDOG_TIMER:
149
+
case MAX77759_CHGR_CHG_DTLS_SUSP_JEITA:
150
+
return POWER_SUPPLY_STATUS_NOT_CHARGING;
151
+
case MAX77759_CHGR_CHG_DTLS_OFF:
152
+
return POWER_SUPPLY_STATUS_DISCHARGING;
153
+
default:
154
+
break;
155
+
}
156
+
157
+
return POWER_SUPPLY_STATUS_UNKNOWN;
158
+
}
159
+
160
+
static int get_charge_type(struct max77759_charger *chg)
161
+
{
162
+
u32 val;
163
+
int ret;
164
+
165
+
ret = regmap_read(chg->regmap, MAX77759_CHGR_REG_CHG_DETAILS_01, &val);
166
+
if (ret)
167
+
return ret;
168
+
169
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switch (FIELD_GET(MAX77759_CHGR_REG_CHG_DETAILS_01_CHG_DTLS, val)) {
170
+
case MAX77759_CHGR_CHG_DTLS_PREQUAL:
171
+
return POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
172
+
case MAX77759_CHGR_CHG_DTLS_CC:
173
+
case MAX77759_CHGR_CHG_DTLS_CV:
174
+
return POWER_SUPPLY_CHARGE_TYPE_FAST;
175
+
case MAX77759_CHGR_CHG_DTLS_TO:
176
+
return POWER_SUPPLY_CHARGE_TYPE_STANDARD;
177
+
case MAX77759_CHGR_CHG_DTLS_DONE:
178
+
case MAX77759_CHGR_CHG_DTLS_TIMER_FAULT:
179
+
case MAX77759_CHGR_CHG_DTLS_SUSP_BATT_THM:
180
+
case MAX77759_CHGR_CHG_DTLS_OFF_WDOG_TIMER:
181
+
case MAX77759_CHGR_CHG_DTLS_SUSP_JEITA:
182
+
case MAX77759_CHGR_CHG_DTLS_OFF:
183
+
return POWER_SUPPLY_CHARGE_TYPE_NONE;
184
+
default:
185
+
break;
186
+
}
187
+
188
+
return POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
189
+
}
190
+
191
+
static int get_chg_health(struct max77759_charger *chg)
192
+
{
193
+
u32 val;
194
+
int ret;
195
+
196
+
ret = regmap_read(chg->regmap, MAX77759_CHGR_REG_CHG_DETAILS_00, &val);
197
+
if (ret)
198
+
return ret;
199
+
200
+
switch (FIELD_GET(MAX77759_CHGR_REG_CHG_DETAILS_00_CHGIN_DTLS, val)) {
201
+
case MAX77759_CHGR_CHGIN_DTLS_VBUS_UNDERVOLTAGE:
202
+
case MAX77759_CHGR_CHGIN_DTLS_VBUS_MARGINAL_VOLTAGE:
203
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return POWER_SUPPLY_HEALTH_UNDERVOLTAGE;
204
+
case MAX77759_CHGR_CHGIN_DTLS_VBUS_OVERVOLTAGE:
205
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return POWER_SUPPLY_HEALTH_OVERVOLTAGE;
206
+
case MAX77759_CHGR_CHGIN_DTLS_VBUS_VALID:
207
+
return POWER_SUPPLY_HEALTH_GOOD;
208
+
default:
209
+
break;
210
+
}
211
+
212
+
return POWER_SUPPLY_HEALTH_UNKNOWN;
213
+
}
214
+
215
+
static int get_batt_health(struct max77759_charger *chg)
216
+
{
217
+
u32 val;
218
+
int ret;
219
+
220
+
ret = regmap_read(chg->regmap, MAX77759_CHGR_REG_CHG_DETAILS_01, &val);
221
+
if (ret)
222
+
return ret;
223
+
224
+
switch (FIELD_GET(MAX77759_CHGR_REG_CHG_DETAILS_01_BAT_DTLS, val)) {
225
+
case MAX77759_CHGR_BAT_DTLS_NO_BATT_CHG_SUSP:
226
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return POWER_SUPPLY_HEALTH_NO_BATTERY;
227
+
case MAX77759_CHGR_BAT_DTLS_DEAD_BATTERY:
228
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return POWER_SUPPLY_HEALTH_DEAD;
229
+
case MAX77759_CHGR_BAT_DTLS_BAT_CHG_TIMER_FAULT:
230
+
return POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
231
+
case MAX77759_CHGR_BAT_DTLS_BAT_OKAY:
232
+
case MAX77759_CHGR_BAT_DTLS_BAT_ONLY_MODE:
233
+
return POWER_SUPPLY_HEALTH_GOOD;
234
+
case MAX77759_CHGR_BAT_DTLS_BAT_UNDERVOLTAGE:
235
+
return POWER_SUPPLY_HEALTH_UNDERVOLTAGE;
236
+
case MAX77759_CHGR_BAT_DTLS_BAT_OVERVOLTAGE:
237
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return POWER_SUPPLY_HEALTH_OVERVOLTAGE;
238
+
case MAX77759_CHGR_BAT_DTLS_BAT_OVERCURRENT:
239
+
return POWER_SUPPLY_HEALTH_OVERCURRENT;
240
+
default:
241
+
break;
242
+
}
243
+
244
+
return POWER_SUPPLY_HEALTH_UNKNOWN;
245
+
}
246
+
247
+
static int get_health(struct max77759_charger *chg)
248
+
{
249
+
int ret;
250
+
251
+
ret = get_online(chg);
252
+
if (ret < 0)
253
+
return ret;
254
+
255
+
if (ret) {
256
+
ret = get_chg_health(chg);
257
+
if (ret < 0 || ret != POWER_SUPPLY_HEALTH_GOOD)
258
+
return ret;
259
+
}
260
+
261
+
return get_batt_health(chg);
262
+
}
263
+
264
+
static int get_fast_charge_current(struct max77759_charger *chg)
265
+
{
266
+
u32 regval, val;
267
+
int ret;
268
+
269
+
ret = regmap_read(chg->regmap, MAX77759_CHGR_REG_CHG_CNFG_02, ®val);
270
+
if (ret)
271
+
return ret;
272
+
273
+
regval = FIELD_GET(MAX77759_CHGR_REG_CHG_CNFG_02_CHGCC, regval);
274
+
ret = linear_range_get_value_array(chgcc_limit_ranges,
275
+
ARRAY_SIZE(chgcc_limit_ranges),
276
+
regval, &val);
277
+
return ret ? ret : val;
278
+
}
279
+
280
+
static int set_fast_charge_current_limit(struct max77759_charger *chg,
281
+
u32 cc_max_ua)
282
+
{
283
+
bool found;
284
+
u32 regval;
285
+
286
+
linear_range_get_selector_high_array(chgcc_limit_ranges,
287
+
ARRAY_SIZE(chgcc_limit_ranges),
288
+
cc_max_ua, ®val, &found);
289
+
if (!found)
290
+
return -EINVAL;
291
+
292
+
return regmap_update_bits(chg->regmap, MAX77759_CHGR_REG_CHG_CNFG_02,
293
+
MAX77759_CHGR_REG_CHG_CNFG_02_CHGCC, regval);
294
+
}
295
+
296
+
static int get_float_voltage(struct max77759_charger *chg)
297
+
{
298
+
u32 regval, val;
299
+
int ret;
300
+
301
+
ret = regmap_read(chg->regmap, MAX77759_CHGR_REG_CHG_CNFG_04, ®val);
302
+
if (ret)
303
+
return ret;
304
+
305
+
regval = FIELD_GET(MAX77759_CHGR_REG_CHG_CNFG_04_CHG_CV_PRM, regval);
306
+
ret = linear_range_get_value_array(chg_cv_prm_ranges,
307
+
ARRAY_SIZE(chg_cv_prm_ranges),
308
+
regval, &val);
309
+
310
+
return ret ? ret : val;
311
+
}
312
+
313
+
static int set_float_voltage_limit(struct max77759_charger *chg, u32 fv_mv)
314
+
{
315
+
u32 regval;
316
+
bool found;
317
+
318
+
linear_range_get_selector_high_array(chg_cv_prm_ranges,
319
+
ARRAY_SIZE(chg_cv_prm_ranges),
320
+
fv_mv, ®val, &found);
321
+
if (!found)
322
+
return -EINVAL;
323
+
324
+
return regmap_update_bits(chg->regmap, MAX77759_CHGR_REG_CHG_CNFG_04,
325
+
MAX77759_CHGR_REG_CHG_CNFG_04_CHG_CV_PRM,
326
+
regval);
327
+
}
328
+
329
+
static int get_input_current_limit(struct max77759_charger *chg)
330
+
{
331
+
u32 regval, val;
332
+
int ret;
333
+
334
+
ret = regmap_read(chg->regmap, MAX77759_CHGR_REG_CHG_CNFG_09, ®val);
335
+
if (ret)
336
+
return ret;
337
+
338
+
regval = FIELD_GET(MAX77759_CHGR_REG_CHG_CNFG_09_CHGIN_ILIM, regval);
339
+
regval = umax(regval, chgin_ilim_ranges[0].min_sel);
340
+
341
+
ret = linear_range_get_value_array(chgin_ilim_ranges,
342
+
ARRAY_SIZE(chgin_ilim_ranges),
343
+
regval, &val);
344
+
345
+
return ret ? ret : val;
346
+
}
347
+
348
+
static int set_input_current_limit(struct max77759_charger *chg, int ilim_ua)
349
+
{
350
+
u32 regval;
351
+
352
+
if (ilim_ua < 0)
353
+
return -EINVAL;
354
+
355
+
linear_range_get_selector_within(chgin_ilim_ranges, ilim_ua, ®val);
356
+
357
+
return regmap_update_bits(chg->regmap, MAX77759_CHGR_REG_CHG_CNFG_09,
358
+
MAX77759_CHGR_REG_CHG_CNFG_09_CHGIN_ILIM,
359
+
regval);
360
+
}
361
+
362
+
static const enum power_supply_property max77759_charger_props[] = {
363
+
POWER_SUPPLY_PROP_ONLINE,
364
+
POWER_SUPPLY_PROP_PRESENT,
365
+
POWER_SUPPLY_PROP_STATUS,
366
+
POWER_SUPPLY_PROP_CHARGE_TYPE,
367
+
POWER_SUPPLY_PROP_HEALTH,
368
+
POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
369
+
POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
370
+
POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
371
+
};
372
+
373
+
static int max77759_charger_get_property(struct power_supply *psy,
374
+
enum power_supply_property psp,
375
+
union power_supply_propval *pval)
376
+
{
377
+
struct max77759_charger *chg = power_supply_get_drvdata(psy);
378
+
int ret;
379
+
380
+
switch (psp) {
381
+
case POWER_SUPPLY_PROP_ONLINE:
382
+
ret = get_online(chg);
383
+
break;
384
+
case POWER_SUPPLY_PROP_PRESENT:
385
+
ret = charger_input_valid(chg);
386
+
break;
387
+
case POWER_SUPPLY_PROP_STATUS:
388
+
ret = get_status(chg);
389
+
break;
390
+
case POWER_SUPPLY_PROP_CHARGE_TYPE:
391
+
ret = get_charge_type(chg);
392
+
break;
393
+
case POWER_SUPPLY_PROP_HEALTH:
394
+
ret = get_health(chg);
395
+
break;
396
+
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
397
+
ret = get_fast_charge_current(chg);
398
+
break;
399
+
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
400
+
ret = get_float_voltage(chg);
401
+
break;
402
+
case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
403
+
ret = get_input_current_limit(chg);
404
+
break;
405
+
default:
406
+
ret = -EINVAL;
407
+
}
408
+
409
+
pval->intval = ret;
410
+
return ret < 0 ? ret : 0;
411
+
}
412
+
413
+
static const struct power_supply_desc max77759_charger_desc = {
414
+
.name = "max77759-charger",
415
+
.type = POWER_SUPPLY_TYPE_USB,
416
+
.properties = max77759_charger_props,
417
+
.num_properties = ARRAY_SIZE(max77759_charger_props),
418
+
.get_property = max77759_charger_get_property,
419
+
};
420
+
421
+
static int charger_set_mode(struct max77759_charger *chg,
422
+
enum max77759_chgr_mode mode)
423
+
{
424
+
int ret;
425
+
426
+
guard(mutex)(&chg->lock);
427
+
428
+
if (chg->mode == mode)
429
+
return 0;
430
+
431
+
if ((mode == MAX77759_CHGR_MODE_CHG_BUCK_ON ||
432
+
mode == MAX77759_CHGR_MODE_OTG_BOOST_ON) &&
433
+
chg->mode != MAX77759_CHGR_MODE_OFF) {
434
+
dev_err(chg->dev, "Invalid mode transition from %d to %d\n",
435
+
chg->mode, mode);
436
+
return -EINVAL;
437
+
}
438
+
439
+
ret = regmap_update_bits(chg->regmap, MAX77759_CHGR_REG_CHG_CNFG_00,
440
+
MAX77759_CHGR_REG_CHG_CNFG_00_MODE, mode);
441
+
if (ret)
442
+
return ret;
443
+
444
+
chg->mode = mode;
445
+
return 0;
446
+
}
447
+
448
+
static int enable_chgin_otg(struct regulator_dev *rdev)
449
+
{
450
+
struct max77759_charger *chg = rdev_get_drvdata(rdev);
451
+
452
+
return charger_set_mode(chg, MAX77759_CHGR_MODE_OTG_BOOST_ON);
453
+
}
454
+
455
+
static int disable_chgin_otg(struct regulator_dev *rdev)
456
+
{
457
+
struct max77759_charger *chg = rdev_get_drvdata(rdev);
458
+
459
+
return charger_set_mode(chg, MAX77759_CHGR_MODE_OFF);
460
+
}
461
+
462
+
static int chgin_otg_status(struct regulator_dev *rdev)
463
+
{
464
+
struct max77759_charger *chg = rdev_get_drvdata(rdev);
465
+
466
+
guard(mutex)(&chg->lock);
467
+
468
+
return chg->mode == MAX77759_CHGR_MODE_OTG_BOOST_ON;
469
+
}
470
+
471
+
static const struct regulator_ops chgin_otg_reg_ops = {
472
+
.enable = enable_chgin_otg,
473
+
.disable = disable_chgin_otg,
474
+
.is_enabled = chgin_otg_status,
475
+
};
476
+
477
+
static const struct regulator_desc chgin_otg_reg_desc = {
478
+
.name = "chgin-otg",
479
+
.of_match = of_match_ptr("chgin-otg-regulator"),
480
+
.owner = THIS_MODULE,
481
+
.ops = &chgin_otg_reg_ops,
482
+
.fixed_uV = 5000000,
483
+
.n_voltages = 1,
484
+
};
485
+
486
+
static irqreturn_t irq_handler(int irq, void *data)
487
+
{
488
+
struct max77759_charger *chg = data;
489
+
490
+
power_supply_changed(chg->psy);
491
+
492
+
return IRQ_HANDLED;
493
+
}
494
+
495
+
static irqreturn_t bat_oilo_irq_handler(int irq, void *data)
496
+
{
497
+
struct max77759_charger *chg = data;
498
+
499
+
dev_warn_ratelimited(chg->dev,
500
+
"Battery over-current threshold crossed\n");
501
+
502
+
return irq_handler(irq, data);
503
+
}
504
+
505
+
static int max77759_init_irqhandler(struct max77759_charger *chg)
506
+
{
507
+
struct device *dev = chg->dev;
508
+
irq_handler_t thread_fn;
509
+
char *name;
510
+
int i, ret;
511
+
512
+
for (i = 0; i < ARRAY_SIZE(chgr_irqs_str); i++) {
513
+
ret = platform_get_irq_byname(to_platform_device(dev),
514
+
chgr_irqs_str[i]);
515
+
if (ret < 0)
516
+
return dev_err_probe(dev, ret,
517
+
"Failed to get irq resource for %s\n",
518
+
chgr_irqs_str[i]);
519
+
520
+
chg->irqs[i] = ret;
521
+
name = devm_kasprintf(dev, GFP_KERNEL, "%s:%s", dev_name(dev),
522
+
chgr_irqs_str[i]);
523
+
if (!name)
524
+
return dev_err_probe(dev, -ENOMEM,
525
+
"Failed to allocate space for irqname: %s\n",
526
+
chgr_irqs_str[i]);
527
+
528
+
if (i == BAT_OILO)
529
+
thread_fn = bat_oilo_irq_handler;
530
+
else
531
+
thread_fn = irq_handler;
532
+
533
+
ret = devm_request_threaded_irq(dev, chg->irqs[i], NULL,
534
+
thread_fn, 0, name, chg);
535
+
if (ret)
536
+
return dev_err_probe(dev, ret,
537
+
"Unable to register irq handler for %s\n",
538
+
chgr_irqs_str[i]);
539
+
}
540
+
541
+
return 0;
542
+
}
543
+
544
+
static int max77759_charger_init(struct max77759_charger *chg)
545
+
{
546
+
struct power_supply_battery_info *info;
547
+
u32 regval, fast_chg_curr, fv;
548
+
int ret;
549
+
550
+
ret = regmap_read(chg->regmap, MAX77759_CHGR_REG_CHG_CNFG_00, ®val);
551
+
if (ret)
552
+
return ret;
553
+
554
+
chg->mode = FIELD_GET(MAX77759_CHGR_REG_CHG_CNFG_00_MODE, regval);
555
+
ret = charger_set_mode(chg, MAX77759_CHGR_MODE_OFF);
556
+
if (ret)
557
+
return ret;
558
+
559
+
if (power_supply_get_battery_info(chg->psy, &info)) {
560
+
fv = CHG_FV_DEFAULT_MV;
561
+
fast_chg_curr = CHG_CC_DEFAULT_UA;
562
+
} else {
563
+
fv = info->constant_charge_voltage_max_uv / 1000;
564
+
fast_chg_curr = info->constant_charge_current_max_ua;
565
+
}
566
+
567
+
ret = set_fast_charge_current_limit(chg, fast_chg_curr);
568
+
if (ret)
569
+
return ret;
570
+
571
+
ret = set_float_voltage_limit(chg, fv);
572
+
if (ret)
573
+
return ret;
574
+
575
+
ret = unlock_prot_regs(chg, true);
576
+
if (ret)
577
+
return ret;
578
+
579
+
/* Disable wireless charging input */
580
+
ret = regmap_update_bits(chg->regmap, MAX77759_CHGR_REG_CHG_CNFG_12,
581
+
MAX77759_CHGR_REG_CHG_CNFG_12_WCINSEL, 0);
582
+
if (ret)
583
+
goto relock;
584
+
585
+
ret = regmap_update_bits(chg->regmap, MAX77759_CHGR_REG_CHG_CNFG_18,
586
+
MAX77759_CHGR_REG_CHG_CNFG_18_WDTEN, 0);
587
+
if (ret)
588
+
goto relock;
589
+
590
+
return unlock_prot_regs(chg, false);
591
+
592
+
relock:
593
+
(void)unlock_prot_regs(chg, false);
594
+
return ret;
595
+
}
596
+
597
+
static void psy_work_item(struct work_struct *work)
598
+
{
599
+
struct max77759_charger *chg =
600
+
container_of(work, struct max77759_charger, psy_work.work);
601
+
union power_supply_propval current_limit, online;
602
+
int ret;
603
+
604
+
ret = power_supply_get_property(chg->tcpm_psy,
605
+
POWER_SUPPLY_PROP_CURRENT_MAX,
606
+
¤t_limit);
607
+
if (ret) {
608
+
dev_err(chg->dev,
609
+
"Failed to get CURRENT_MAX psy property, ret=%d\n",
610
+
ret);
611
+
goto err;
612
+
}
613
+
614
+
ret = power_supply_get_property(chg->tcpm_psy, POWER_SUPPLY_PROP_ONLINE,
615
+
&online);
616
+
if (ret) {
617
+
dev_err(chg->dev,
618
+
"Failed to get ONLINE psy property, ret=%d\n",
619
+
ret);
620
+
goto err;
621
+
}
622
+
623
+
if (online.intval && current_limit.intval) {
624
+
ret = set_input_current_limit(chg, current_limit.intval);
625
+
if (ret) {
626
+
dev_err(chg->dev,
627
+
"Unable to set current limit, ret=%d\n", ret);
628
+
goto err;
629
+
}
630
+
631
+
charger_set_mode(chg, MAX77759_CHGR_MODE_CHG_BUCK_ON);
632
+
} else {
633
+
charger_set_mode(chg, MAX77759_CHGR_MODE_OFF);
634
+
}
635
+
636
+
scoped_guard(mutex, &chg->retry_lock) {
637
+
if (chg->psy_work_retry_cnt)
638
+
dev_dbg(chg->dev,
639
+
"chg psy_work succeeded after %u tries\n",
640
+
chg->psy_work_retry_cnt);
641
+
chg->psy_work_retry_cnt = 0;
642
+
}
643
+
644
+
return;
645
+
646
+
err:
647
+
charger_set_mode(chg, MAX77759_CHGR_MODE_OFF);
648
+
scoped_guard(mutex, &chg->retry_lock) {
649
+
if (chg->psy_work_retry_cnt >= MAX_NUM_RETRIES) {
650
+
dev_err(chg->dev, "chg psy work failed, giving up\n");
651
+
return;
652
+
}
653
+
654
+
++chg->psy_work_retry_cnt;
655
+
dev_dbg(chg->dev, "Retrying %u/%u chg psy_work\n",
656
+
chg->psy_work_retry_cnt, MAX_NUM_RETRIES);
657
+
schedule_delayed_work(&chg->psy_work,
658
+
msecs_to_jiffies(PSY_WORK_RETRY_DELAY_MS));
659
+
}
660
+
}
661
+
662
+
static int psy_changed(struct notifier_block *nb, unsigned long evt, void *data)
663
+
{
664
+
struct max77759_charger *chg = container_of(nb, struct max77759_charger,
665
+
nb);
666
+
static const char *psy_name = "tcpm-source";
667
+
struct power_supply *psy = data;
668
+
669
+
if (!strnstr(psy->desc->name, psy_name, strlen(psy_name)) ||
670
+
evt != PSY_EVENT_PROP_CHANGED)
671
+
return NOTIFY_OK;
672
+
673
+
chg->tcpm_psy = psy;
674
+
scoped_guard(mutex, &chg->retry_lock)
675
+
chg->psy_work_retry_cnt = 0;
676
+
677
+
schedule_delayed_work(&chg->psy_work, 0);
678
+
679
+
return NOTIFY_OK;
680
+
}
681
+
682
+
static void max_tcpci_unregister_psy_notifier(void *nb)
683
+
{
684
+
power_supply_unreg_notifier(nb);
685
+
}
686
+
687
+
static int max77759_charger_probe(struct platform_device *pdev)
688
+
{
689
+
struct regulator_config chgin_otg_reg_cfg;
690
+
struct power_supply_config psy_cfg;
691
+
struct device *dev = &pdev->dev;
692
+
struct max77759_charger *chg;
693
+
int ret;
694
+
695
+
device_set_of_node_from_dev(dev, dev->parent);
696
+
chg = devm_kzalloc(dev, sizeof(*chg), GFP_KERNEL);
697
+
if (!chg)
698
+
return -ENOMEM;
699
+
700
+
platform_set_drvdata(pdev, chg);
701
+
chg->dev = dev;
702
+
chg->regmap = dev_get_regmap(dev->parent, "charger");
703
+
if (!chg->regmap)
704
+
return dev_err_probe(dev, -ENODEV, "Missing regmap\n");
705
+
706
+
ret = devm_mutex_init(dev, &chg->lock);
707
+
if (ret)
708
+
return dev_err_probe(dev, ret, "Failed to initialize lock\n");
709
+
710
+
ret = devm_mutex_init(dev, &chg->retry_lock);
711
+
if (ret)
712
+
return dev_err_probe(dev, ret,
713
+
"Failed to initialize retry_lock\n");
714
+
715
+
psy_cfg.fwnode = dev_fwnode(dev);
716
+
psy_cfg.drv_data = chg;
717
+
chg->psy = devm_power_supply_register(dev, &max77759_charger_desc,
718
+
&psy_cfg);
719
+
if (IS_ERR(chg->psy))
720
+
return dev_err_probe(dev, PTR_ERR(chg->psy),
721
+
"Failed to register psy\n");
722
+
723
+
ret = max77759_charger_init(chg);
724
+
if (ret)
725
+
return dev_err_probe(dev, ret,
726
+
"Failed to initialize max77759 charger\n");
727
+
728
+
chgin_otg_reg_cfg.dev = dev;
729
+
chgin_otg_reg_cfg.driver_data = chg;
730
+
chgin_otg_reg_cfg.of_node = dev_of_node(dev);
731
+
chg->chgin_otg_rdev = devm_regulator_register(dev, &chgin_otg_reg_desc,
732
+
&chgin_otg_reg_cfg);
733
+
if (IS_ERR(chg->chgin_otg_rdev))
734
+
return dev_err_probe(dev, PTR_ERR(chg->chgin_otg_rdev),
735
+
"Failed to register chgin otg regulator\n");
736
+
737
+
ret = devm_delayed_work_autocancel(dev, &chg->psy_work, psy_work_item);
738
+
if (ret)
739
+
return dev_err_probe(dev, ret, "Failed to initialize psy work\n");
740
+
741
+
chg->nb.notifier_call = psy_changed;
742
+
ret = power_supply_reg_notifier(&chg->nb);
743
+
if (ret)
744
+
return dev_err_probe(dev, ret,
745
+
"Unable to register psy notifier\n");
746
+
747
+
ret = devm_add_action_or_reset(dev, max_tcpci_unregister_psy_notifier,
748
+
&chg->nb);
749
+
if (ret)
750
+
return dev_err_probe(dev, ret,
751
+
"Failed to add devm action to unregister psy notifier\n");
752
+
753
+
return max77759_init_irqhandler(chg);
754
+
}
755
+
756
+
static const struct platform_device_id max77759_charger_id[] = {
757
+
{ .name = "max77759-charger", },
758
+
{ }
759
+
};
760
+
MODULE_DEVICE_TABLE(platform, max77759_charger_id);
761
+
762
+
static struct platform_driver max77759_charger_driver = {
763
+
.driver = {
764
+
.name = "max77759-charger",
765
+
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
766
+
},
767
+
.probe = max77759_charger_probe,
768
+
.id_table = max77759_charger_id,
769
+
};
770
+
module_platform_driver(max77759_charger_driver);
771
+
772
+
MODULE_AUTHOR("Amit Sunil Dhamne <amitsd@google.com>");
773
+
MODULE_DESCRIPTION("Maxim MAX77759 charger driver");
774
+
MODULE_LICENSE("GPL");