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13#include <linux/interrupt.h>
14#include <linux/module.h>
15#include <linux/of.h>
16#include <linux/of_irq.h>
17#include <linux/platform_device.h>
18#include <linux/power_supply.h>
19#include <linux/regmap.h>
20#include <linux/gpio/consumer.h>
21
22static const char *act8945a_charger_model = "ACT8945A";
23static const char *act8945a_charger_manufacturer = "Active-semi";
24
25
26
27
28
29
30#define ACT8945A_APCH_CFG 0x71
31#define ACT8945A_APCH_STATUS 0x78
32#define ACT8945A_APCH_CTRL 0x79
33#define ACT8945A_APCH_STATE 0x7A
34
35
36#define APCH_CFG_OVPSET (0x3 << 0)
37#define APCH_CFG_OVPSET_6V6 (0x0 << 0)
38#define APCH_CFG_OVPSET_7V (0x1 << 0)
39#define APCH_CFG_OVPSET_7V5 (0x2 << 0)
40#define APCH_CFG_OVPSET_8V (0x3 << 0)
41#define APCH_CFG_PRETIMO (0x3 << 2)
42#define APCH_CFG_PRETIMO_40_MIN (0x0 << 2)
43#define APCH_CFG_PRETIMO_60_MIN (0x1 << 2)
44#define APCH_CFG_PRETIMO_80_MIN (0x2 << 2)
45#define APCH_CFG_PRETIMO_DISABLED (0x3 << 2)
46#define APCH_CFG_TOTTIMO (0x3 << 4)
47#define APCH_CFG_TOTTIMO_3_HOUR (0x0 << 4)
48#define APCH_CFG_TOTTIMO_4_HOUR (0x1 << 4)
49#define APCH_CFG_TOTTIMO_5_HOUR (0x2 << 4)
50#define APCH_CFG_TOTTIMO_DISABLED (0x3 << 4)
51#define APCH_CFG_SUSCHG (0x1 << 7)
52
53#define APCH_STATUS_CHGDAT BIT(0)
54#define APCH_STATUS_INDAT BIT(1)
55#define APCH_STATUS_TEMPDAT BIT(2)
56#define APCH_STATUS_TIMRDAT BIT(3)
57#define APCH_STATUS_CHGSTAT BIT(4)
58#define APCH_STATUS_INSTAT BIT(5)
59#define APCH_STATUS_TEMPSTAT BIT(6)
60#define APCH_STATUS_TIMRSTAT BIT(7)
61
62#define APCH_CTRL_CHGEOCOUT BIT(0)
63#define APCH_CTRL_INDIS BIT(1)
64#define APCH_CTRL_TEMPOUT BIT(2)
65#define APCH_CTRL_TIMRPRE BIT(3)
66#define APCH_CTRL_CHGEOCIN BIT(4)
67#define APCH_CTRL_INCON BIT(5)
68#define APCH_CTRL_TEMPIN BIT(6)
69#define APCH_CTRL_TIMRTOT BIT(7)
70
71#define APCH_STATE_ACINSTAT (0x1 << 1)
72#define APCH_STATE_CSTATE (0x3 << 4)
73#define APCH_STATE_CSTATE_SHIFT 4
74#define APCH_STATE_CSTATE_DISABLED 0x00
75#define APCH_STATE_CSTATE_EOC 0x01
76#define APCH_STATE_CSTATE_FAST 0x02
77#define APCH_STATE_CSTATE_PRE 0x03
78
79struct act8945a_charger {
80 struct power_supply *psy;
81 struct power_supply_desc desc;
82 struct regmap *regmap;
83 struct work_struct work;
84
85 bool init_done;
86 struct gpio_desc *lbo_gpio;
87 struct gpio_desc *chglev_gpio;
88};
89
90static int act8945a_get_charger_state(struct regmap *regmap, int *val)
91{
92 int ret;
93 unsigned int status, state;
94
95 ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
96 if (ret < 0)
97 return ret;
98
99 ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
100 if (ret < 0)
101 return ret;
102
103 state &= APCH_STATE_CSTATE;
104 state >>= APCH_STATE_CSTATE_SHIFT;
105
106 switch (state) {
107 case APCH_STATE_CSTATE_PRE:
108 case APCH_STATE_CSTATE_FAST:
109 *val = POWER_SUPPLY_STATUS_CHARGING;
110 break;
111 case APCH_STATE_CSTATE_EOC:
112 if (status & APCH_STATUS_CHGDAT)
113 *val = POWER_SUPPLY_STATUS_FULL;
114 else
115 *val = POWER_SUPPLY_STATUS_CHARGING;
116 break;
117 case APCH_STATE_CSTATE_DISABLED:
118 default:
119 if (!(status & APCH_STATUS_INDAT))
120 *val = POWER_SUPPLY_STATUS_DISCHARGING;
121 else
122 *val = POWER_SUPPLY_STATUS_NOT_CHARGING;
123 break;
124 }
125
126 return 0;
127}
128
129static int act8945a_get_charge_type(struct regmap *regmap, int *val)
130{
131 int ret;
132 unsigned int status, state;
133
134 ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
135 if (ret < 0)
136 return ret;
137
138 ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
139 if (ret < 0)
140 return ret;
141
142 state &= APCH_STATE_CSTATE;
143 state >>= APCH_STATE_CSTATE_SHIFT;
144
145 switch (state) {
146 case APCH_STATE_CSTATE_PRE:
147 *val = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
148 break;
149 case APCH_STATE_CSTATE_FAST:
150 *val = POWER_SUPPLY_CHARGE_TYPE_FAST;
151 break;
152 case APCH_STATE_CSTATE_EOC:
153 *val = POWER_SUPPLY_CHARGE_TYPE_NONE;
154 break;
155 case APCH_STATE_CSTATE_DISABLED:
156 default:
157 if (!(status & APCH_STATUS_INDAT))
158 *val = POWER_SUPPLY_CHARGE_TYPE_NONE;
159 else
160 *val = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
161 break;
162 }
163
164 return 0;
165}
166
167static int act8945a_get_battery_health(struct regmap *regmap, int *val)
168{
169 int ret;
170 unsigned int status, state, config;
171
172 ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
173 if (ret < 0)
174 return ret;
175
176 ret = regmap_read(regmap, ACT8945A_APCH_CFG, &config);
177 if (ret < 0)
178 return ret;
179
180 ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
181 if (ret < 0)
182 return ret;
183
184 state &= APCH_STATE_CSTATE;
185 state >>= APCH_STATE_CSTATE_SHIFT;
186
187 switch (state) {
188 case APCH_STATE_CSTATE_DISABLED:
189 if (config & APCH_CFG_SUSCHG) {
190 *val = POWER_SUPPLY_HEALTH_UNKNOWN;
191 } else if (status & APCH_STATUS_INDAT) {
192 if (!(status & APCH_STATUS_TEMPDAT))
193 *val = POWER_SUPPLY_HEALTH_OVERHEAT;
194 else if (status & APCH_STATUS_TIMRDAT)
195 *val = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
196 else
197 *val = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
198 } else {
199 *val = POWER_SUPPLY_HEALTH_GOOD;
200 }
201 break;
202 case APCH_STATE_CSTATE_PRE:
203 case APCH_STATE_CSTATE_FAST:
204 case APCH_STATE_CSTATE_EOC:
205 default:
206 *val = POWER_SUPPLY_HEALTH_GOOD;
207 break;
208 }
209
210 return 0;
211}
212
213static int act8945a_get_capacity_level(struct act8945a_charger *charger,
214 struct regmap *regmap, int *val)
215{
216 int ret;
217 unsigned int status, state, config;
218 int lbo_level = gpiod_get_value(charger->lbo_gpio);
219
220 ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
221 if (ret < 0)
222 return ret;
223
224 ret = regmap_read(regmap, ACT8945A_APCH_CFG, &config);
225 if (ret < 0)
226 return ret;
227
228 ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
229 if (ret < 0)
230 return ret;
231
232 state &= APCH_STATE_CSTATE;
233 state >>= APCH_STATE_CSTATE_SHIFT;
234
235 switch (state) {
236 case APCH_STATE_CSTATE_PRE:
237 *val = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
238 break;
239 case APCH_STATE_CSTATE_FAST:
240 if (lbo_level)
241 *val = POWER_SUPPLY_CAPACITY_LEVEL_HIGH;
242 else
243 *val = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
244 break;
245 case APCH_STATE_CSTATE_EOC:
246 if (status & APCH_STATUS_CHGDAT)
247 *val = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
248 else
249 *val = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
250 break;
251 case APCH_STATE_CSTATE_DISABLED:
252 default:
253 if (config & APCH_CFG_SUSCHG) {
254 *val = POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN;
255 } else {
256 *val = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
257 if (!(status & APCH_STATUS_INDAT)) {
258 if (!lbo_level)
259 *val = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
260 }
261 }
262 break;
263 }
264
265 return 0;
266}
267
268#define MAX_CURRENT_USB_HIGH 450000
269#define MAX_CURRENT_USB_LOW 90000
270#define MAX_CURRENT_USB_PRE 45000
271
272
273
274
275#define MAX_CURRENT_AC_HIGH 886527
276#define MAX_CURRENT_AC_LOW 117305
277#define MAX_CURRENT_AC_HIGH_PRE 88653
278#define MAX_CURRENT_AC_LOW_PRE 11731
279
280static int act8945a_get_current_max(struct act8945a_charger *charger,
281 struct regmap *regmap, int *val)
282{
283 int ret;
284 unsigned int status, state;
285 unsigned int acin_state;
286 int chgin_level = gpiod_get_value(charger->chglev_gpio);
287
288 ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
289 if (ret < 0)
290 return ret;
291
292 ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
293 if (ret < 0)
294 return ret;
295
296 acin_state = (state & APCH_STATE_ACINSTAT) >> 1;
297
298 state &= APCH_STATE_CSTATE;
299 state >>= APCH_STATE_CSTATE_SHIFT;
300
301 switch (state) {
302 case APCH_STATE_CSTATE_PRE:
303 if (acin_state) {
304 if (chgin_level)
305 *val = MAX_CURRENT_AC_HIGH_PRE;
306 else
307 *val = MAX_CURRENT_AC_LOW_PRE;
308 } else {
309 *val = MAX_CURRENT_USB_PRE;
310 }
311 break;
312 case APCH_STATE_CSTATE_FAST:
313 if (acin_state) {
314 if (chgin_level)
315 *val = MAX_CURRENT_AC_HIGH;
316 else
317 *val = MAX_CURRENT_AC_LOW;
318 } else {
319 if (chgin_level)
320 *val = MAX_CURRENT_USB_HIGH;
321 else
322 *val = MAX_CURRENT_USB_LOW;
323 }
324 break;
325 case APCH_STATE_CSTATE_EOC:
326 case APCH_STATE_CSTATE_DISABLED:
327 default:
328 *val = 0;
329 break;
330 }
331
332 return 0;
333}
334
335static enum power_supply_property act8945a_charger_props[] = {
336 POWER_SUPPLY_PROP_STATUS,
337 POWER_SUPPLY_PROP_CHARGE_TYPE,
338 POWER_SUPPLY_PROP_TECHNOLOGY,
339 POWER_SUPPLY_PROP_HEALTH,
340 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
341 POWER_SUPPLY_PROP_CURRENT_MAX,
342 POWER_SUPPLY_PROP_MODEL_NAME,
343 POWER_SUPPLY_PROP_MANUFACTURER
344};
345
346static int act8945a_charger_get_property(struct power_supply *psy,
347 enum power_supply_property prop,
348 union power_supply_propval *val)
349{
350 struct act8945a_charger *charger = power_supply_get_drvdata(psy);
351 struct regmap *regmap = charger->regmap;
352 int ret = 0;
353
354 switch (prop) {
355 case POWER_SUPPLY_PROP_STATUS:
356 ret = act8945a_get_charger_state(regmap, &val->intval);
357 break;
358 case POWER_SUPPLY_PROP_CHARGE_TYPE:
359 ret = act8945a_get_charge_type(regmap, &val->intval);
360 break;
361 case POWER_SUPPLY_PROP_TECHNOLOGY:
362 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
363 break;
364 case POWER_SUPPLY_PROP_HEALTH:
365 ret = act8945a_get_battery_health(regmap, &val->intval);
366 break;
367 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
368 ret = act8945a_get_capacity_level(charger,
369 regmap, &val->intval);
370 break;
371 case POWER_SUPPLY_PROP_CURRENT_MAX:
372 ret = act8945a_get_current_max(charger,
373 regmap, &val->intval);
374 break;
375 case POWER_SUPPLY_PROP_MODEL_NAME:
376 val->strval = act8945a_charger_model;
377 break;
378 case POWER_SUPPLY_PROP_MANUFACTURER:
379 val->strval = act8945a_charger_manufacturer;
380 break;
381 default:
382 return -EINVAL;
383 }
384
385 return ret;
386}
387
388static int act8945a_enable_interrupt(struct act8945a_charger *charger)
389{
390 struct regmap *regmap = charger->regmap;
391 unsigned char ctrl;
392 int ret;
393
394 ctrl = APCH_CTRL_CHGEOCOUT | APCH_CTRL_CHGEOCIN |
395 APCH_CTRL_INDIS | APCH_CTRL_INCON |
396 APCH_CTRL_TEMPOUT | APCH_CTRL_TEMPIN |
397 APCH_CTRL_TIMRPRE | APCH_CTRL_TIMRTOT;
398 ret = regmap_write(regmap, ACT8945A_APCH_CTRL, ctrl);
399 if (ret)
400 return ret;
401
402 ctrl = APCH_STATUS_CHGSTAT | APCH_STATUS_INSTAT |
403 APCH_STATUS_TEMPSTAT | APCH_STATUS_TIMRSTAT;
404 ret = regmap_write(regmap, ACT8945A_APCH_STATUS, ctrl);
405 if (ret)
406 return ret;
407
408 return 0;
409}
410
411static unsigned int act8945a_set_supply_type(struct act8945a_charger *charger,
412 unsigned int *type)
413{
414 unsigned int status, state;
415 int ret;
416
417 ret = regmap_read(charger->regmap, ACT8945A_APCH_STATUS, &status);
418 if (ret < 0)
419 return ret;
420
421 ret = regmap_read(charger->regmap, ACT8945A_APCH_STATE, &state);
422 if (ret < 0)
423 return ret;
424
425 if (status & APCH_STATUS_INDAT) {
426 if (state & APCH_STATE_ACINSTAT)
427 *type = POWER_SUPPLY_TYPE_MAINS;
428 else
429 *type = POWER_SUPPLY_TYPE_USB;
430 } else {
431 *type = POWER_SUPPLY_TYPE_BATTERY;
432 }
433
434 return 0;
435}
436
437static void act8945a_work(struct work_struct *work)
438{
439 struct act8945a_charger *charger =
440 container_of(work, struct act8945a_charger, work);
441
442 act8945a_set_supply_type(charger, &charger->desc.type);
443
444 power_supply_changed(charger->psy);
445}
446
447static irqreturn_t act8945a_status_changed(int irq, void *dev_id)
448{
449 struct act8945a_charger *charger = dev_id;
450
451 if (charger->init_done)
452 schedule_work(&charger->work);
453
454 return IRQ_HANDLED;
455}
456
457#define DEFAULT_TOTAL_TIME_OUT 3
458#define DEFAULT_PRE_TIME_OUT 40
459#define DEFAULT_INPUT_OVP_THRESHOLD 6600
460
461static int act8945a_charger_config(struct device *dev,
462 struct act8945a_charger *charger)
463{
464 struct device_node *np = dev->of_node;
465 struct regmap *regmap = charger->regmap;
466
467 u32 total_time_out;
468 u32 pre_time_out;
469 u32 input_voltage_threshold;
470 int err, ret;
471
472 unsigned int tmp;
473 unsigned int value = 0;
474
475 if (!np) {
476 dev_err(dev, "no charger of node\n");
477 return -EINVAL;
478 }
479
480 ret = regmap_read(regmap, ACT8945A_APCH_CFG, &tmp);
481 if (ret)
482 return ret;
483
484 if (tmp & APCH_CFG_SUSCHG) {
485 value |= APCH_CFG_SUSCHG;
486 dev_info(dev, "have been suspended\n");
487 }
488
489 charger->lbo_gpio = devm_gpiod_get_optional(dev, "active-semi,lbo",
490 GPIOD_IN);
491 if (IS_ERR(charger->lbo_gpio)) {
492 err = PTR_ERR(charger->lbo_gpio);
493 dev_err(dev, "unable to claim gpio \"lbo\": %d\n", err);
494 return err;
495 }
496
497 ret = devm_request_irq(dev, gpiod_to_irq(charger->lbo_gpio),
498 act8945a_status_changed,
499 (IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING),
500 "act8945a_lbo_detect", charger);
501 if (ret)
502 dev_info(dev, "failed to request gpio \"lbo\" IRQ\n");
503
504 charger->chglev_gpio = devm_gpiod_get_optional(dev,
505 "active-semi,chglev",
506 GPIOD_IN);
507 if (IS_ERR(charger->chglev_gpio)) {
508 err = PTR_ERR(charger->chglev_gpio);
509 dev_err(dev, "unable to claim gpio \"chglev\": %d\n", err);
510 return err;
511 }
512
513 if (of_property_read_u32(np,
514 "active-semi,input-voltage-threshold-microvolt",
515 &input_voltage_threshold))
516 input_voltage_threshold = DEFAULT_INPUT_OVP_THRESHOLD;
517
518 if (of_property_read_u32(np,
519 "active-semi,precondition-timeout",
520 &pre_time_out))
521 pre_time_out = DEFAULT_PRE_TIME_OUT;
522
523 if (of_property_read_u32(np, "active-semi,total-timeout",
524 &total_time_out))
525 total_time_out = DEFAULT_TOTAL_TIME_OUT;
526
527 switch (input_voltage_threshold) {
528 case 8000:
529 value |= APCH_CFG_OVPSET_8V;
530 break;
531 case 7500:
532 value |= APCH_CFG_OVPSET_7V5;
533 break;
534 case 7000:
535 value |= APCH_CFG_OVPSET_7V;
536 break;
537 case 6600:
538 default:
539 value |= APCH_CFG_OVPSET_6V6;
540 break;
541 }
542
543 switch (pre_time_out) {
544 case 60:
545 value |= APCH_CFG_PRETIMO_60_MIN;
546 break;
547 case 80:
548 value |= APCH_CFG_PRETIMO_80_MIN;
549 break;
550 case 0:
551 value |= APCH_CFG_PRETIMO_DISABLED;
552 break;
553 case 40:
554 default:
555 value |= APCH_CFG_PRETIMO_40_MIN;
556 break;
557 }
558
559 switch (total_time_out) {
560 case 4:
561 value |= APCH_CFG_TOTTIMO_4_HOUR;
562 break;
563 case 5:
564 value |= APCH_CFG_TOTTIMO_5_HOUR;
565 break;
566 case 0:
567 value |= APCH_CFG_TOTTIMO_DISABLED;
568 break;
569 case 3:
570 default:
571 value |= APCH_CFG_TOTTIMO_3_HOUR;
572 break;
573 }
574
575 return regmap_write(regmap, ACT8945A_APCH_CFG, value);
576}
577
578static int act8945a_charger_probe(struct platform_device *pdev)
579{
580 struct act8945a_charger *charger;
581 struct power_supply_config psy_cfg = {};
582 int irq, ret;
583
584 charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
585 if (!charger)
586 return -ENOMEM;
587
588 charger->regmap = dev_get_regmap(pdev->dev.parent, NULL);
589 if (!charger->regmap) {
590 dev_err(&pdev->dev, "Parent did not provide regmap\n");
591 return -EINVAL;
592 }
593
594 ret = act8945a_charger_config(&pdev->dev, charger);
595 if (ret)
596 return ret;
597
598 irq = of_irq_get(pdev->dev.of_node, 0);
599 if (irq <= 0) {
600 dev_err(&pdev->dev, "failed to find IRQ number\n");
601 return irq ?: -ENXIO;
602 }
603
604 ret = devm_request_irq(&pdev->dev, irq, act8945a_status_changed,
605 IRQF_TRIGGER_FALLING, "act8945a_interrupt",
606 charger);
607 if (ret) {
608 dev_err(&pdev->dev, "failed to request nIRQ pin IRQ\n");
609 return ret;
610 }
611
612 charger->desc.name = "act8945a-charger";
613 charger->desc.get_property = act8945a_charger_get_property;
614 charger->desc.properties = act8945a_charger_props;
615 charger->desc.num_properties = ARRAY_SIZE(act8945a_charger_props);
616
617 ret = act8945a_set_supply_type(charger, &charger->desc.type);
618 if (ret)
619 return -EINVAL;
620
621 psy_cfg.of_node = pdev->dev.of_node;
622 psy_cfg.drv_data = charger;
623
624 charger->psy = devm_power_supply_register(&pdev->dev,
625 &charger->desc,
626 &psy_cfg);
627 if (IS_ERR(charger->psy)) {
628 dev_err(&pdev->dev, "failed to register power supply\n");
629 return PTR_ERR(charger->psy);
630 }
631
632 platform_set_drvdata(pdev, charger);
633
634 INIT_WORK(&charger->work, act8945a_work);
635
636 ret = act8945a_enable_interrupt(charger);
637 if (ret)
638 return -EIO;
639
640 charger->init_done = true;
641
642 return 0;
643}
644
645static int act8945a_charger_remove(struct platform_device *pdev)
646{
647 struct act8945a_charger *charger = platform_get_drvdata(pdev);
648
649 charger->init_done = false;
650 cancel_work_sync(&charger->work);
651
652 return 0;
653}
654
655static struct platform_driver act8945a_charger_driver = {
656 .driver = {
657 .name = "act8945a-charger",
658 },
659 .probe = act8945a_charger_probe,
660 .remove = act8945a_charger_remove,
661};
662module_platform_driver(act8945a_charger_driver);
663
664MODULE_DESCRIPTION("Active-semi ACT8945A ActivePath charger driver");
665MODULE_AUTHOR("Wenyou Yang <wenyou.yang@atmel.com>");
666MODULE_LICENSE("GPL");
667
