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/mutex.h>
18 #include <linux/of.h>
19 #include <linux/platform_device.h>
20 #include <linux/power_supply.h>
21 #include <linux/regmap.h>
22 #include <linux/regulator/driver.h>
23 #include <linux/string_choices.h>
24 #include <linux/workqueue.h>
25
26 /* Default values for Fast Charge Current & Float Voltage */
27 #define CHG_CC_DEFAULT_UA 2266770
28 #define CHG_FV_DEFAULT_MV 4300
29
30 #define MAX_NUM_RETRIES 3
31 #define PSY_WORK_RETRY_DELAY_MS 10
32
33 #define FOREACH_IRQ(S) \
34 S(AICL), \
35 S(CHGIN), \
36 S(CHG), \
37 S(INLIM), \
38 S(BAT_OILO), \
39 S(CHG_STA_CC), \
40 S(CHG_STA_CV), \
41 S(CHG_STA_TO), \
42 S(CHG_STA_DONE)
43
44 #define GENERATE_ENUM(e) e
45 #define GENERATE_STRING(s) #s
46
47 enum {
48 FOREACH_IRQ(GENERATE_ENUM)
49 };
50
51 static const char *const chgr_irqs_str[] = {
52 FOREACH_IRQ(GENERATE_STRING)
53 };
54
55 #define NUM_IRQS ARRAY_SIZE(chgr_irqs_str)
56
57 /* Fast charge current limits (in uA) */
58 static const struct linear_range chgcc_limit_ranges[] = {
59 LINEAR_RANGE(133330, 0x0, 0x2, 0),
60 LINEAR_RANGE(200000, 0x3, 0x3C, 66670),
61 };
62
63 /* Charge Termination Voltage Limits (in mV) */
64 static const struct linear_range chg_cv_prm_ranges[] = {
65 LINEAR_RANGE(3800, 0x38, 0x39, 100),
66 LINEAR_RANGE(4000, 0x0, 0x32, 10),
67 };
68
69 /* USB input current limits (in uA) */
70 static const struct linear_range chgin_ilim_ranges[] = {
71 LINEAR_RANGE(100000, 0x3, 0x7F, 25000),
72 };
73
74 struct max77759_charger {
75 struct device *dev;
76 struct regmap *regmap;
77 struct power_supply *psy;
78 struct regulator_dev *chgin_otg_rdev;
79 struct notifier_block nb;
80 struct power_supply *tcpm_psy;
81 struct delayed_work psy_work;
82 struct mutex retry_lock; /* Protects psy_work_retry_cnt */
83 u32 psy_work_retry_cnt;
84 int irqs[NUM_IRQS];
85 struct mutex lock; /* protects the state below */
86 enum max77759_chgr_mode mode;
87 };
88
unlock_prot_regs(struct max77759_charger * chg,bool unlock)89 static inline int unlock_prot_regs(struct max77759_charger *chg, bool unlock)
90 {
91 return regmap_update_bits(chg->regmap, MAX77759_CHGR_REG_CHG_CNFG_06,
92 MAX77759_CHGR_REG_CHG_CNFG_06_CHGPROT, unlock
93 ? MAX77759_CHGR_REG_CHG_CNFG_06_CHGPROT : 0);
94 }
95
charger_input_valid(struct max77759_charger * chg)96 static int charger_input_valid(struct max77759_charger *chg)
97 {
98 u32 val;
99 int ret;
100
101 ret = regmap_read(chg->regmap, MAX77759_CHGR_REG_CHG_INT_OK, &val);
102 if (ret)
103 return ret;
104
105 return (val & MAX77759_CHGR_REG_CHG_INT_CHG) &&
106 (val & MAX77759_CHGR_REG_CHG_INT_CHGIN);
107 }
108
get_online(struct max77759_charger * chg)109 static int get_online(struct max77759_charger *chg)
110 {
111 u32 val;
112 int ret;
113
114 ret = charger_input_valid(chg);
115 if (ret <= 0)
116 return ret;
117
118 ret = regmap_read(chg->regmap, MAX77759_CHGR_REG_CHG_DETAILS_02, &val);
119 if (ret)
120 return ret;
121
122 guard(mutex)(&chg->lock);
123
124 return (val & MAX77759_CHGR_REG_CHG_DETAILS_02_CHGIN_STS) &&
125 (chg->mode == MAX77759_CHGR_MODE_CHG_BUCK_ON);
126 }
127
get_status(struct max77759_charger * chg)128 static int get_status(struct max77759_charger *chg)
129 {
130 u32 val;
131 int ret;
132
133 ret = regmap_read(chg->regmap, MAX77759_CHGR_REG_CHG_DETAILS_01, &val);
134 if (ret)
135 return ret;
136
137 switch (FIELD_GET(MAX77759_CHGR_REG_CHG_DETAILS_01_CHG_DTLS, val)) {
138 case MAX77759_CHGR_CHG_DTLS_PREQUAL:
139 case MAX77759_CHGR_CHG_DTLS_CC:
140 case MAX77759_CHGR_CHG_DTLS_CV:
141 case MAX77759_CHGR_CHG_DTLS_TO:
142 return POWER_SUPPLY_STATUS_CHARGING;
143 case MAX77759_CHGR_CHG_DTLS_DONE:
144 return POWER_SUPPLY_STATUS_FULL;
145 case MAX77759_CHGR_CHG_DTLS_TIMER_FAULT:
146 case MAX77759_CHGR_CHG_DTLS_SUSP_BATT_THM:
147 case MAX77759_CHGR_CHG_DTLS_OFF_WDOG_TIMER:
148 case MAX77759_CHGR_CHG_DTLS_SUSP_JEITA:
149 return POWER_SUPPLY_STATUS_NOT_CHARGING;
150 case MAX77759_CHGR_CHG_DTLS_OFF:
151 return POWER_SUPPLY_STATUS_DISCHARGING;
152 default:
153 break;
154 }
155
156 return POWER_SUPPLY_STATUS_UNKNOWN;
157 }
158
get_charge_type(struct max77759_charger * chg)159 static int get_charge_type(struct max77759_charger *chg)
160 {
161 u32 val;
162 int ret;
163
164 ret = regmap_read(chg->regmap, MAX77759_CHGR_REG_CHG_DETAILS_01, &val);
165 if (ret)
166 return ret;
167
168 switch (FIELD_GET(MAX77759_CHGR_REG_CHG_DETAILS_01_CHG_DTLS, val)) {
169 case MAX77759_CHGR_CHG_DTLS_PREQUAL:
170 return POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
171 case MAX77759_CHGR_CHG_DTLS_CC:
172 case MAX77759_CHGR_CHG_DTLS_CV:
173 return POWER_SUPPLY_CHARGE_TYPE_FAST;
174 case MAX77759_CHGR_CHG_DTLS_TO:
175 return POWER_SUPPLY_CHARGE_TYPE_STANDARD;
176 case MAX77759_CHGR_CHG_DTLS_DONE:
177 case MAX77759_CHGR_CHG_DTLS_TIMER_FAULT:
178 case MAX77759_CHGR_CHG_DTLS_SUSP_BATT_THM:
179 case MAX77759_CHGR_CHG_DTLS_OFF_WDOG_TIMER:
180 case MAX77759_CHGR_CHG_DTLS_SUSP_JEITA:
181 case MAX77759_CHGR_CHG_DTLS_OFF:
182 return POWER_SUPPLY_CHARGE_TYPE_NONE;
183 default:
184 break;
185 }
186
187 return POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
188 }
189
get_chg_health(struct max77759_charger * chg)190 static int get_chg_health(struct max77759_charger *chg)
191 {
192 u32 val;
193 int ret;
194
195 ret = regmap_read(chg->regmap, MAX77759_CHGR_REG_CHG_DETAILS_00, &val);
196 if (ret)
197 return ret;
198
199 switch (FIELD_GET(MAX77759_CHGR_REG_CHG_DETAILS_00_CHGIN_DTLS, val)) {
200 case MAX77759_CHGR_CHGIN_DTLS_VBUS_UNDERVOLTAGE:
201 case MAX77759_CHGR_CHGIN_DTLS_VBUS_MARGINAL_VOLTAGE:
202 return POWER_SUPPLY_HEALTH_UNDERVOLTAGE;
203 case MAX77759_CHGR_CHGIN_DTLS_VBUS_OVERVOLTAGE:
204 return POWER_SUPPLY_HEALTH_OVERVOLTAGE;
205 case MAX77759_CHGR_CHGIN_DTLS_VBUS_VALID:
206 return POWER_SUPPLY_HEALTH_GOOD;
207 default:
208 break;
209 }
210
211 return POWER_SUPPLY_HEALTH_UNKNOWN;
212 }
213
get_batt_health(struct max77759_charger * chg)214 static int get_batt_health(struct max77759_charger *chg)
215 {
216 u32 val;
217 int ret;
218
219 ret = regmap_read(chg->regmap, MAX77759_CHGR_REG_CHG_DETAILS_01, &val);
220 if (ret)
221 return ret;
222
223 switch (FIELD_GET(MAX77759_CHGR_REG_CHG_DETAILS_01_BAT_DTLS, val)) {
224 case MAX77759_CHGR_BAT_DTLS_NO_BATT_CHG_SUSP:
225 return POWER_SUPPLY_HEALTH_NO_BATTERY;
226 case MAX77759_CHGR_BAT_DTLS_DEAD_BATTERY:
227 return POWER_SUPPLY_HEALTH_DEAD;
228 case MAX77759_CHGR_BAT_DTLS_BAT_CHG_TIMER_FAULT:
229 return POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
230 case MAX77759_CHGR_BAT_DTLS_BAT_OKAY:
231 case MAX77759_CHGR_BAT_DTLS_BAT_ONLY_MODE:
232 return POWER_SUPPLY_HEALTH_GOOD;
233 case MAX77759_CHGR_BAT_DTLS_BAT_UNDERVOLTAGE:
234 return POWER_SUPPLY_HEALTH_UNDERVOLTAGE;
235 case MAX77759_CHGR_BAT_DTLS_BAT_OVERVOLTAGE:
236 return POWER_SUPPLY_HEALTH_OVERVOLTAGE;
237 case MAX77759_CHGR_BAT_DTLS_BAT_OVERCURRENT:
238 return POWER_SUPPLY_HEALTH_OVERCURRENT;
239 default:
240 break;
241 }
242
243 return POWER_SUPPLY_HEALTH_UNKNOWN;
244 }
245
get_health(struct max77759_charger * chg)246 static int get_health(struct max77759_charger *chg)
247 {
248 int ret;
249
250 ret = get_online(chg);
251 if (ret < 0)
252 return ret;
253
254 if (ret) {
255 ret = get_chg_health(chg);
256 if (ret < 0 || ret != POWER_SUPPLY_HEALTH_GOOD)
257 return ret;
258 }
259
260 return get_batt_health(chg);
261 }
262
get_fast_charge_current(struct max77759_charger * chg)263 static int get_fast_charge_current(struct max77759_charger *chg)
264 {
265 u32 regval, val;
266 int ret;
267
268 ret = regmap_read(chg->regmap, MAX77759_CHGR_REG_CHG_CNFG_02, ®val);
269 if (ret)
270 return ret;
271
272 regval = FIELD_GET(MAX77759_CHGR_REG_CHG_CNFG_02_CHGCC, regval);
273 ret = linear_range_get_value_array(chgcc_limit_ranges,
274 ARRAY_SIZE(chgcc_limit_ranges),
275 regval, &val);
276 return ret ? ret : val;
277 }
278
set_fast_charge_current_limit(struct max77759_charger * chg,u32 cc_max_ua)279 static int set_fast_charge_current_limit(struct max77759_charger *chg,
280 u32 cc_max_ua)
281 {
282 bool found;
283 u32 regval;
284
285 linear_range_get_selector_high_array(chgcc_limit_ranges,
286 ARRAY_SIZE(chgcc_limit_ranges),
287 cc_max_ua, ®val, &found);
288 if (!found)
289 return -EINVAL;
290
291 return regmap_update_bits(chg->regmap, MAX77759_CHGR_REG_CHG_CNFG_02,
292 MAX77759_CHGR_REG_CHG_CNFG_02_CHGCC, regval);
293 }
294
get_float_voltage(struct max77759_charger * chg)295 static int get_float_voltage(struct max77759_charger *chg)
296 {
297 u32 regval, val;
298 int ret;
299
300 ret = regmap_read(chg->regmap, MAX77759_CHGR_REG_CHG_CNFG_04, ®val);
301 if (ret)
302 return ret;
303
304 regval = FIELD_GET(MAX77759_CHGR_REG_CHG_CNFG_04_CHG_CV_PRM, regval);
305 ret = linear_range_get_value_array(chg_cv_prm_ranges,
306 ARRAY_SIZE(chg_cv_prm_ranges),
307 regval, &val);
308
309 return ret ? ret : val;
310 }
311
set_float_voltage_limit(struct max77759_charger * chg,u32 fv_mv)312 static int set_float_voltage_limit(struct max77759_charger *chg, u32 fv_mv)
313 {
314 u32 regval;
315 bool found;
316
317 linear_range_get_selector_high_array(chg_cv_prm_ranges,
318 ARRAY_SIZE(chg_cv_prm_ranges),
319 fv_mv, ®val, &found);
320 if (!found)
321 return -EINVAL;
322
323 return regmap_update_bits(chg->regmap, MAX77759_CHGR_REG_CHG_CNFG_04,
324 MAX77759_CHGR_REG_CHG_CNFG_04_CHG_CV_PRM,
325 regval);
326 }
327
get_input_current_limit(struct max77759_charger * chg)328 static int get_input_current_limit(struct max77759_charger *chg)
329 {
330 u32 regval, val;
331 int ret;
332
333 ret = regmap_read(chg->regmap, MAX77759_CHGR_REG_CHG_CNFG_09, ®val);
334 if (ret)
335 return ret;
336
337 regval = FIELD_GET(MAX77759_CHGR_REG_CHG_CNFG_09_CHGIN_ILIM, regval);
338 regval = umax(regval, chgin_ilim_ranges[0].min_sel);
339
340 ret = linear_range_get_value_array(chgin_ilim_ranges,
341 ARRAY_SIZE(chgin_ilim_ranges),
342 regval, &val);
343
344 return ret ? ret : val;
345 }
346
set_input_current_limit(struct max77759_charger * chg,int ilim_ua)347 static int set_input_current_limit(struct max77759_charger *chg, int ilim_ua)
348 {
349 u32 regval;
350
351 if (ilim_ua < 0)
352 return -EINVAL;
353
354 linear_range_get_selector_within(chgin_ilim_ranges, ilim_ua, ®val);
355
356 return regmap_update_bits(chg->regmap, MAX77759_CHGR_REG_CHG_CNFG_09,
357 MAX77759_CHGR_REG_CHG_CNFG_09_CHGIN_ILIM,
358 regval);
359 }
360
361 static const enum power_supply_property max77759_charger_props[] = {
362 POWER_SUPPLY_PROP_ONLINE,
363 POWER_SUPPLY_PROP_PRESENT,
364 POWER_SUPPLY_PROP_STATUS,
365 POWER_SUPPLY_PROP_CHARGE_TYPE,
366 POWER_SUPPLY_PROP_HEALTH,
367 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
368 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
369 POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
370 };
371
max77759_charger_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * pval)372 static int max77759_charger_get_property(struct power_supply *psy,
373 enum power_supply_property psp,
374 union power_supply_propval *pval)
375 {
376 struct max77759_charger *chg = power_supply_get_drvdata(psy);
377 int ret;
378
379 switch (psp) {
380 case POWER_SUPPLY_PROP_ONLINE:
381 ret = get_online(chg);
382 break;
383 case POWER_SUPPLY_PROP_PRESENT:
384 ret = charger_input_valid(chg);
385 break;
386 case POWER_SUPPLY_PROP_STATUS:
387 ret = get_status(chg);
388 break;
389 case POWER_SUPPLY_PROP_CHARGE_TYPE:
390 ret = get_charge_type(chg);
391 break;
392 case POWER_SUPPLY_PROP_HEALTH:
393 ret = get_health(chg);
394 break;
395 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
396 ret = get_fast_charge_current(chg);
397 break;
398 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
399 ret = get_float_voltage(chg);
400 break;
401 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
402 ret = get_input_current_limit(chg);
403 break;
404 default:
405 ret = -EINVAL;
406 }
407
408 pval->intval = ret;
409 return ret < 0 ? ret : 0;
410 }
411
412 static const struct power_supply_desc max77759_charger_desc = {
413 .name = "max77759-charger",
414 .type = POWER_SUPPLY_TYPE_USB,
415 .properties = max77759_charger_props,
416 .num_properties = ARRAY_SIZE(max77759_charger_props),
417 .get_property = max77759_charger_get_property,
418 };
419
charger_set_mode(struct max77759_charger * chg,enum max77759_chgr_mode mode)420 static int charger_set_mode(struct max77759_charger *chg,
421 enum max77759_chgr_mode mode)
422 {
423 int ret;
424
425 guard(mutex)(&chg->lock);
426
427 if (chg->mode == mode)
428 return 0;
429
430 if ((mode == MAX77759_CHGR_MODE_CHG_BUCK_ON ||
431 mode == MAX77759_CHGR_MODE_OTG_BOOST_ON) &&
432 chg->mode != MAX77759_CHGR_MODE_OFF) {
433 dev_err(chg->dev, "Invalid mode transition from %d to %d\n",
434 chg->mode, mode);
435 return -EINVAL;
436 }
437
438 ret = regmap_update_bits(chg->regmap, MAX77759_CHGR_REG_CHG_CNFG_00,
439 MAX77759_CHGR_REG_CHG_CNFG_00_MODE, mode);
440 if (ret)
441 return ret;
442
443 chg->mode = mode;
444 return 0;
445 }
446
enable_chgin_otg(struct regulator_dev * rdev)447 static int enable_chgin_otg(struct regulator_dev *rdev)
448 {
449 struct max77759_charger *chg = rdev_get_drvdata(rdev);
450
451 return charger_set_mode(chg, MAX77759_CHGR_MODE_OTG_BOOST_ON);
452 }
453
disable_chgin_otg(struct regulator_dev * rdev)454 static int disable_chgin_otg(struct regulator_dev *rdev)
455 {
456 struct max77759_charger *chg = rdev_get_drvdata(rdev);
457
458 return charger_set_mode(chg, MAX77759_CHGR_MODE_OFF);
459 }
460
chgin_otg_status(struct regulator_dev * rdev)461 static int chgin_otg_status(struct regulator_dev *rdev)
462 {
463 struct max77759_charger *chg = rdev_get_drvdata(rdev);
464
465 guard(mutex)(&chg->lock);
466
467 return chg->mode == MAX77759_CHGR_MODE_OTG_BOOST_ON;
468 }
469
470 static const struct regulator_ops chgin_otg_reg_ops = {
471 .enable = enable_chgin_otg,
472 .disable = disable_chgin_otg,
473 .is_enabled = chgin_otg_status,
474 };
475
476 static const struct regulator_desc chgin_otg_reg_desc = {
477 .name = "chgin-otg",
478 .of_match = of_match_ptr("chgin-otg-regulator"),
479 .owner = THIS_MODULE,
480 .ops = &chgin_otg_reg_ops,
481 .fixed_uV = 5000000,
482 .n_voltages = 1,
483 };
484
irq_handler(int irq,void * data)485 static irqreturn_t irq_handler(int irq, void *data)
486 {
487 struct max77759_charger *chg = data;
488
489 power_supply_changed(chg->psy);
490
491 return IRQ_HANDLED;
492 }
493
bat_oilo_irq_handler(int irq,void * data)494 static irqreturn_t bat_oilo_irq_handler(int irq, void *data)
495 {
496 struct max77759_charger *chg = data;
497
498 dev_warn_ratelimited(chg->dev,
499 "Battery over-current threshold crossed\n");
500
501 return irq_handler(irq, data);
502 }
503
max77759_init_irqhandler(struct max77759_charger * chg)504 static int max77759_init_irqhandler(struct max77759_charger *chg)
505 {
506 struct device *dev = chg->dev;
507 irq_handler_t thread_fn;
508 char *name;
509 int i, ret;
510
511 for (i = 0; i < ARRAY_SIZE(chgr_irqs_str); i++) {
512 ret = platform_get_irq_byname(to_platform_device(dev),
513 chgr_irqs_str[i]);
514 if (ret < 0)
515 return dev_err_probe(dev, ret,
516 "Failed to get irq resource for %s\n",
517 chgr_irqs_str[i]);
518
519 chg->irqs[i] = ret;
520 name = devm_kasprintf(dev, GFP_KERNEL, "%s:%s", dev_name(dev),
521 chgr_irqs_str[i]);
522 if (!name)
523 return dev_err_probe(dev, -ENOMEM,
524 "Failed to allocate space for irqname: %s\n",
525 chgr_irqs_str[i]);
526
527 if (i == BAT_OILO)
528 thread_fn = bat_oilo_irq_handler;
529 else
530 thread_fn = irq_handler;
531
532 ret = devm_request_threaded_irq(dev, chg->irqs[i], NULL,
533 thread_fn, 0, name, chg);
534 if (ret)
535 return ret;
536 }
537
538 return 0;
539 }
540
max77759_charger_init(struct max77759_charger * chg)541 static int max77759_charger_init(struct max77759_charger *chg)
542 {
543 struct power_supply_battery_info *info;
544 u32 regval, fast_chg_curr, fv;
545 int ret;
546
547 ret = regmap_read(chg->regmap, MAX77759_CHGR_REG_CHG_CNFG_00, ®val);
548 if (ret)
549 return ret;
550
551 chg->mode = FIELD_GET(MAX77759_CHGR_REG_CHG_CNFG_00_MODE, regval);
552 ret = charger_set_mode(chg, MAX77759_CHGR_MODE_OFF);
553 if (ret)
554 return ret;
555
556 if (power_supply_get_battery_info(chg->psy, &info)) {
557 fv = CHG_FV_DEFAULT_MV;
558 fast_chg_curr = CHG_CC_DEFAULT_UA;
559 } else {
560 fv = info->constant_charge_voltage_max_uv / 1000;
561 fast_chg_curr = info->constant_charge_current_max_ua;
562 }
563
564 ret = set_fast_charge_current_limit(chg, fast_chg_curr);
565 if (ret)
566 return ret;
567
568 ret = set_float_voltage_limit(chg, fv);
569 if (ret)
570 return ret;
571
572 ret = unlock_prot_regs(chg, true);
573 if (ret)
574 return ret;
575
576 /* Disable wireless charging input */
577 ret = regmap_update_bits(chg->regmap, MAX77759_CHGR_REG_CHG_CNFG_12,
578 MAX77759_CHGR_REG_CHG_CNFG_12_WCINSEL, 0);
579 if (ret)
580 goto relock;
581
582 ret = regmap_update_bits(chg->regmap, MAX77759_CHGR_REG_CHG_CNFG_18,
583 MAX77759_CHGR_REG_CHG_CNFG_18_WDTEN, 0);
584 if (ret)
585 goto relock;
586
587 return unlock_prot_regs(chg, false);
588
589 relock:
590 (void)unlock_prot_regs(chg, false);
591 return ret;
592 }
593
psy_work_item(struct work_struct * work)594 static void psy_work_item(struct work_struct *work)
595 {
596 struct max77759_charger *chg =
597 container_of(work, struct max77759_charger, psy_work.work);
598 union power_supply_propval current_limit, online;
599 int ret;
600
601 ret = power_supply_get_property(chg->tcpm_psy,
602 POWER_SUPPLY_PROP_CURRENT_MAX,
603 ¤t_limit);
604 if (ret) {
605 dev_err(chg->dev,
606 "Failed to get CURRENT_MAX psy property, ret=%d\n",
607 ret);
608 goto err;
609 }
610
611 ret = power_supply_get_property(chg->tcpm_psy, POWER_SUPPLY_PROP_ONLINE,
612 &online);
613 if (ret) {
614 dev_err(chg->dev,
615 "Failed to get ONLINE psy property, ret=%d\n",
616 ret);
617 goto err;
618 }
619
620 if (online.intval && current_limit.intval) {
621 ret = set_input_current_limit(chg, current_limit.intval);
622 if (ret) {
623 dev_err(chg->dev,
624 "Unable to set current limit, ret=%d\n", ret);
625 goto err;
626 }
627
628 charger_set_mode(chg, MAX77759_CHGR_MODE_CHG_BUCK_ON);
629 } else {
630 charger_set_mode(chg, MAX77759_CHGR_MODE_OFF);
631 }
632
633 scoped_guard(mutex, &chg->retry_lock) {
634 if (chg->psy_work_retry_cnt)
635 dev_dbg(chg->dev,
636 "chg psy_work succeeded after %u tries\n",
637 chg->psy_work_retry_cnt);
638 chg->psy_work_retry_cnt = 0;
639 }
640
641 return;
642
643 err:
644 charger_set_mode(chg, MAX77759_CHGR_MODE_OFF);
645 scoped_guard(mutex, &chg->retry_lock) {
646 if (chg->psy_work_retry_cnt >= MAX_NUM_RETRIES) {
647 dev_err(chg->dev, "chg psy work failed, giving up\n");
648 return;
649 }
650
651 ++chg->psy_work_retry_cnt;
652 dev_dbg(chg->dev, "Retrying %u/%u chg psy_work\n",
653 chg->psy_work_retry_cnt, MAX_NUM_RETRIES);
654 schedule_delayed_work(&chg->psy_work,
655 msecs_to_jiffies(PSY_WORK_RETRY_DELAY_MS));
656 }
657 }
658
psy_changed(struct notifier_block * nb,unsigned long evt,void * data)659 static int psy_changed(struct notifier_block *nb, unsigned long evt, void *data)
660 {
661 struct max77759_charger *chg = container_of(nb, struct max77759_charger,
662 nb);
663 static const char *psy_name = "tcpm-source";
664 struct power_supply *psy = data;
665
666 if (!strnstr(psy->desc->name, psy_name, strlen(psy_name)) ||
667 evt != PSY_EVENT_PROP_CHANGED)
668 return NOTIFY_OK;
669
670 chg->tcpm_psy = psy;
671 scoped_guard(mutex, &chg->retry_lock)
672 chg->psy_work_retry_cnt = 0;
673
674 schedule_delayed_work(&chg->psy_work, 0);
675
676 return NOTIFY_OK;
677 }
678
max_tcpci_unregister_psy_notifier(void * nb)679 static void max_tcpci_unregister_psy_notifier(void *nb)
680 {
681 power_supply_unreg_notifier(nb);
682 }
683
max77759_charger_probe(struct platform_device * pdev)684 static int max77759_charger_probe(struct platform_device *pdev)
685 {
686 struct regulator_config chgin_otg_reg_cfg;
687 struct power_supply_config psy_cfg;
688 struct device *dev = &pdev->dev;
689 struct max77759_charger *chg;
690 int ret;
691
692 device_set_of_node_from_dev(dev, dev->parent);
693 chg = devm_kzalloc(dev, sizeof(*chg), GFP_KERNEL);
694 if (!chg)
695 return -ENOMEM;
696
697 platform_set_drvdata(pdev, chg);
698 chg->dev = dev;
699 chg->regmap = dev_get_regmap(dev->parent, "charger");
700 if (!chg->regmap)
701 return dev_err_probe(dev, -ENODEV, "Missing regmap\n");
702
703 ret = devm_mutex_init(dev, &chg->lock);
704 if (ret)
705 return dev_err_probe(dev, ret, "Failed to initialize lock\n");
706
707 ret = devm_mutex_init(dev, &chg->retry_lock);
708 if (ret)
709 return dev_err_probe(dev, ret,
710 "Failed to initialize retry_lock\n");
711
712 psy_cfg.fwnode = dev_fwnode(dev);
713 psy_cfg.drv_data = chg;
714 chg->psy = devm_power_supply_register(dev, &max77759_charger_desc,
715 &psy_cfg);
716 if (IS_ERR(chg->psy))
717 return dev_err_probe(dev, PTR_ERR(chg->psy),
718 "Failed to register psy\n");
719
720 ret = max77759_charger_init(chg);
721 if (ret)
722 return dev_err_probe(dev, ret,
723 "Failed to initialize max77759 charger\n");
724
725 chgin_otg_reg_cfg.dev = dev;
726 chgin_otg_reg_cfg.driver_data = chg;
727 chgin_otg_reg_cfg.of_node = dev_of_node(dev);
728 chg->chgin_otg_rdev = devm_regulator_register(dev, &chgin_otg_reg_desc,
729 &chgin_otg_reg_cfg);
730 if (IS_ERR(chg->chgin_otg_rdev))
731 return dev_err_probe(dev, PTR_ERR(chg->chgin_otg_rdev),
732 "Failed to register chgin otg regulator\n");
733
734 ret = devm_delayed_work_autocancel(dev, &chg->psy_work, psy_work_item);
735 if (ret)
736 return dev_err_probe(dev, ret, "Failed to initialize psy work\n");
737
738 chg->nb.notifier_call = psy_changed;
739 ret = power_supply_reg_notifier(&chg->nb);
740 if (ret)
741 return dev_err_probe(dev, ret,
742 "Unable to register psy notifier\n");
743
744 ret = devm_add_action_or_reset(dev, max_tcpci_unregister_psy_notifier,
745 &chg->nb);
746 if (ret)
747 return dev_err_probe(dev, ret,
748 "Failed to add devm action to unregister psy notifier\n");
749
750 return max77759_init_irqhandler(chg);
751 }
752
753 static const struct platform_device_id max77759_charger_id[] = {
754 { .name = "max77759-charger" },
755 { }
756 };
757 MODULE_DEVICE_TABLE(platform, max77759_charger_id);
758
759 static struct platform_driver max77759_charger_driver = {
760 .driver = {
761 .name = "max77759-charger",
762 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
763 },
764 .probe = max77759_charger_probe,
765 .id_table = max77759_charger_id,
766 };
767 module_platform_driver(max77759_charger_driver);
768
769 MODULE_AUTHOR("Amit Sunil Dhamne <amitsd@google.com>");
770 MODULE_DESCRIPTION("Maxim MAX77759 charger driver");
771 MODULE_LICENSE("GPL");
772