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