1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Power supply driver for the RICOH RN5T618 power management chip family
4 *
5 * Copyright (C) 2020 Andreas Kemnade
6 */
7
8#include <linux/kernel.h>
9#include <linux/device.h>
10#include <linux/bitops.h>
11#include <linux/errno.h>
12#include <linux/iio/consumer.h>
13#include <linux/init.h>
14#include <linux/interrupt.h>
15#include <linux/module.h>
16#include <linux/mfd/rn5t618.h>
17#include <linux/platform_device.h>
18#include <linux/power_supply.h>
19#include <linux/regmap.h>
20#include <linux/slab.h>
21
22#define CHG_STATE_ADP_INPUT 0x40
23#define CHG_STATE_USB_INPUT 0x80
24#define CHG_STATE_MASK 0x1f
25#define CHG_STATE_CHG_OFF 0
26#define CHG_STATE_CHG_READY_VADP 1
27#define CHG_STATE_CHG_TRICKLE 2
28#define CHG_STATE_CHG_RAPID 3
29#define CHG_STATE_CHG_COMPLETE 4
30#define CHG_STATE_SUSPEND 5
31#define CHG_STATE_VCHG_OVER_VOL 6
32#define CHG_STATE_BAT_ERROR 7
33#define CHG_STATE_NO_BAT 8
34#define CHG_STATE_BAT_OVER_VOL 9
35#define CHG_STATE_BAT_TEMP_ERR 10
36#define CHG_STATE_DIE_ERR 11
37#define CHG_STATE_DIE_SHUTDOWN 12
38#define CHG_STATE_NO_BAT2 13
39#define CHG_STATE_CHG_READY_VUSB 14
40
41#define GCHGDET_TYPE_MASK 0x30
42#define GCHGDET_TYPE_SDP 0x00
43#define GCHGDET_TYPE_CDP 0x10
44#define GCHGDET_TYPE_DCP 0x20
45
46#define FG_ENABLE 1
47
48/*
49 * Formula seems accurate for battery current, but for USB current around 70mA
50 * per step was seen on Kobo Clara HD but all sources show the same formula
51 * also fur USB current. To avoid accidentially unwanted high currents we stick
52 * to that formula
53 */
54#define TO_CUR_REG(x) ((x) / 100000 - 1)
55#define FROM_CUR_REG(x) ((((x) & 0x1f) + 1) * 100000)
56#define CHG_MIN_CUR 100000
57#define CHG_MAX_CUR 1800000
58#define ADP_MAX_CUR 2500000
59#define USB_MAX_CUR 1400000
60
61
62struct rn5t618_power_info {
63 struct rn5t618 *rn5t618;
64 struct platform_device *pdev;
65 struct power_supply *battery;
66 struct power_supply *usb;
67 struct power_supply *adp;
68 struct iio_channel *channel_vusb;
69 struct iio_channel *channel_vadp;
70 int irq;
71};
72
73static enum power_supply_usb_type rn5t618_usb_types[] = {
74 POWER_SUPPLY_USB_TYPE_SDP,
75 POWER_SUPPLY_USB_TYPE_DCP,
76 POWER_SUPPLY_USB_TYPE_CDP,
77 POWER_SUPPLY_USB_TYPE_UNKNOWN
78};
79
80static enum power_supply_property rn5t618_usb_props[] = {
81 /* input current limit is not very accurate */
82 POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
83 POWER_SUPPLY_PROP_VOLTAGE_NOW,
84 POWER_SUPPLY_PROP_STATUS,
85 POWER_SUPPLY_PROP_USB_TYPE,
86 POWER_SUPPLY_PROP_ONLINE,
87};
88
89static enum power_supply_property rn5t618_adp_props[] = {
90 /* input current limit is not very accurate */
91 POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
92 POWER_SUPPLY_PROP_VOLTAGE_NOW,
93 POWER_SUPPLY_PROP_STATUS,
94 POWER_SUPPLY_PROP_ONLINE,
95};
96
97
98static enum power_supply_property rn5t618_battery_props[] = {
99 POWER_SUPPLY_PROP_STATUS,
100 POWER_SUPPLY_PROP_PRESENT,
101 POWER_SUPPLY_PROP_VOLTAGE_NOW,
102 POWER_SUPPLY_PROP_CURRENT_NOW,
103 POWER_SUPPLY_PROP_CAPACITY,
104 POWER_SUPPLY_PROP_TEMP,
105 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
106 POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
107 POWER_SUPPLY_PROP_TECHNOLOGY,
108 POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT,
109 POWER_SUPPLY_PROP_CHARGE_FULL,
110 POWER_SUPPLY_PROP_CHARGE_NOW,
111};
112
113static int rn5t618_battery_read_doublereg(struct rn5t618_power_info *info,
114 u8 reg, u16 *result)
115{
116 int ret, i;
117 u8 data[2];
118 u16 old, new;
119
120 old = 0;
121 /* Prevent races when registers are changing. */
122 for (i = 0; i < 3; i++) {
123 ret = regmap_bulk_read(map: info->rn5t618->regmap,
124 reg, val: data, val_count: sizeof(data));
125 if (ret)
126 return ret;
127
128 new = data[0] << 8;
129 new |= data[1];
130 if (new == old)
131 break;
132
133 old = new;
134 }
135
136 *result = new;
137
138 return 0;
139}
140
141static int rn5t618_decode_status(unsigned int status)
142{
143 switch (status & CHG_STATE_MASK) {
144 case CHG_STATE_CHG_OFF:
145 case CHG_STATE_SUSPEND:
146 case CHG_STATE_VCHG_OVER_VOL:
147 case CHG_STATE_DIE_SHUTDOWN:
148 return POWER_SUPPLY_STATUS_DISCHARGING;
149
150 case CHG_STATE_CHG_TRICKLE:
151 case CHG_STATE_CHG_RAPID:
152 return POWER_SUPPLY_STATUS_CHARGING;
153
154 case CHG_STATE_CHG_COMPLETE:
155 return POWER_SUPPLY_STATUS_FULL;
156
157 default:
158 return POWER_SUPPLY_STATUS_NOT_CHARGING;
159 }
160}
161
162static int rn5t618_battery_status(struct rn5t618_power_info *info,
163 union power_supply_propval *val)
164{
165 unsigned int v;
166 int ret;
167
168 ret = regmap_read(map: info->rn5t618->regmap, RN5T618_CHGSTATE, val: &v);
169 if (ret)
170 return ret;
171
172 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
173
174 if (v & 0xc0) { /* USB or ADP plugged */
175 val->intval = rn5t618_decode_status(status: v);
176 } else
177 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
178
179 return ret;
180}
181
182static int rn5t618_battery_present(struct rn5t618_power_info *info,
183 union power_supply_propval *val)
184{
185 unsigned int v;
186 int ret;
187
188 ret = regmap_read(map: info->rn5t618->regmap, RN5T618_CHGSTATE, val: &v);
189 if (ret)
190 return ret;
191
192 v &= CHG_STATE_MASK;
193 if ((v == CHG_STATE_NO_BAT) || (v == CHG_STATE_NO_BAT2))
194 val->intval = 0;
195 else
196 val->intval = 1;
197
198 return ret;
199}
200
201static int rn5t618_battery_voltage_now(struct rn5t618_power_info *info,
202 union power_supply_propval *val)
203{
204 u16 res;
205 int ret;
206
207 ret = rn5t618_battery_read_doublereg(info, RN5T618_VOLTAGE_1, result: &res);
208 if (ret)
209 return ret;
210
211 val->intval = res * 2 * 2500 / 4095 * 1000;
212
213 return 0;
214}
215
216static int rn5t618_battery_current_now(struct rn5t618_power_info *info,
217 union power_supply_propval *val)
218{
219 u16 res;
220 int ret;
221
222 ret = rn5t618_battery_read_doublereg(info, RN5T618_CC_AVEREG1, result: &res);
223 if (ret)
224 return ret;
225
226 /* current is negative when discharging */
227 val->intval = sign_extend32(value: res, index: 13) * 1000;
228
229 return 0;
230}
231
232static int rn5t618_battery_capacity(struct rn5t618_power_info *info,
233 union power_supply_propval *val)
234{
235 unsigned int v;
236 int ret;
237
238 ret = regmap_read(map: info->rn5t618->regmap, RN5T618_SOC, val: &v);
239 if (ret)
240 return ret;
241
242 val->intval = v;
243
244 return 0;
245}
246
247static int rn5t618_battery_temp(struct rn5t618_power_info *info,
248 union power_supply_propval *val)
249{
250 u16 res;
251 int ret;
252
253 ret = rn5t618_battery_read_doublereg(info, RN5T618_TEMP_1, result: &res);
254 if (ret)
255 return ret;
256
257 val->intval = sign_extend32(value: res, index: 11) * 10 / 16;
258
259 return 0;
260}
261
262static int rn5t618_battery_tte(struct rn5t618_power_info *info,
263 union power_supply_propval *val)
264{
265 u16 res;
266 int ret;
267
268 ret = rn5t618_battery_read_doublereg(info, RN5T618_TT_EMPTY_H, result: &res);
269 if (ret)
270 return ret;
271
272 if (res == 65535)
273 return -ENODATA;
274
275 val->intval = res * 60;
276
277 return 0;
278}
279
280static int rn5t618_battery_ttf(struct rn5t618_power_info *info,
281 union power_supply_propval *val)
282{
283 u16 res;
284 int ret;
285
286 ret = rn5t618_battery_read_doublereg(info, RN5T618_TT_FULL_H, result: &res);
287 if (ret)
288 return ret;
289
290 if (res == 65535)
291 return -ENODATA;
292
293 val->intval = res * 60;
294
295 return 0;
296}
297
298static int rn5t618_battery_set_current_limit(struct rn5t618_power_info *info,
299 const union power_supply_propval *val)
300{
301 if (val->intval < CHG_MIN_CUR)
302 return -EINVAL;
303
304 if (val->intval >= CHG_MAX_CUR)
305 return -EINVAL;
306
307 return regmap_update_bits(map: info->rn5t618->regmap,
308 RN5T618_CHGISET,
309 mask: 0x1F, TO_CUR_REG(val->intval));
310}
311
312static int rn5t618_battery_get_current_limit(struct rn5t618_power_info *info,
313 union power_supply_propval *val)
314{
315 unsigned int regval;
316 int ret;
317
318 ret = regmap_read(map: info->rn5t618->regmap, RN5T618_CHGISET,
319 val: &regval);
320 if (ret < 0)
321 return ret;
322
323 val->intval = FROM_CUR_REG(regval);
324
325 return 0;
326}
327
328static int rn5t618_battery_charge_full(struct rn5t618_power_info *info,
329 union power_supply_propval *val)
330{
331 u16 res;
332 int ret;
333
334 ret = rn5t618_battery_read_doublereg(info, RN5T618_FA_CAP_H, result: &res);
335 if (ret)
336 return ret;
337
338 val->intval = res * 1000;
339
340 return 0;
341}
342
343static int rn5t618_battery_charge_now(struct rn5t618_power_info *info,
344 union power_supply_propval *val)
345{
346 u16 res;
347 int ret;
348
349 ret = rn5t618_battery_read_doublereg(info, RN5T618_RE_CAP_H, result: &res);
350 if (ret)
351 return ret;
352
353 val->intval = res * 1000;
354
355 return 0;
356}
357
358static int rn5t618_battery_get_property(struct power_supply *psy,
359 enum power_supply_property psp,
360 union power_supply_propval *val)
361{
362 int ret = 0;
363 struct rn5t618_power_info *info = power_supply_get_drvdata(psy);
364
365 switch (psp) {
366 case POWER_SUPPLY_PROP_STATUS:
367 ret = rn5t618_battery_status(info, val);
368 break;
369 case POWER_SUPPLY_PROP_PRESENT:
370 ret = rn5t618_battery_present(info, val);
371 break;
372 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
373 ret = rn5t618_battery_voltage_now(info, val);
374 break;
375 case POWER_SUPPLY_PROP_CURRENT_NOW:
376 ret = rn5t618_battery_current_now(info, val);
377 break;
378 case POWER_SUPPLY_PROP_CAPACITY:
379 ret = rn5t618_battery_capacity(info, val);
380 break;
381 case POWER_SUPPLY_PROP_TEMP:
382 ret = rn5t618_battery_temp(info, val);
383 break;
384 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
385 ret = rn5t618_battery_tte(info, val);
386 break;
387 case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
388 ret = rn5t618_battery_ttf(info, val);
389 break;
390 case POWER_SUPPLY_PROP_TECHNOLOGY:
391 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
392 break;
393 case POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT:
394 ret = rn5t618_battery_get_current_limit(info, val);
395 break;
396 case POWER_SUPPLY_PROP_CHARGE_FULL:
397 ret = rn5t618_battery_charge_full(info, val);
398 break;
399 case POWER_SUPPLY_PROP_CHARGE_NOW:
400 ret = rn5t618_battery_charge_now(info, val);
401 break;
402 default:
403 return -EINVAL;
404 }
405
406 return ret;
407}
408
409static int rn5t618_battery_set_property(struct power_supply *psy,
410 enum power_supply_property psp,
411 const union power_supply_propval *val)
412{
413 struct rn5t618_power_info *info = power_supply_get_drvdata(psy);
414
415 switch (psp) {
416 case POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT:
417 return rn5t618_battery_set_current_limit(info, val);
418 default:
419 return -EINVAL;
420 }
421}
422
423static int rn5t618_battery_property_is_writeable(struct power_supply *psy,
424 enum power_supply_property psp)
425{
426 switch (psp) {
427 case POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT:
428 return true;
429 default:
430 return false;
431 }
432}
433
434static int rn5t618_adp_get_property(struct power_supply *psy,
435 enum power_supply_property psp,
436 union power_supply_propval *val)
437{
438 struct rn5t618_power_info *info = power_supply_get_drvdata(psy);
439 unsigned int chgstate;
440 unsigned int regval;
441 bool online;
442 int ret;
443
444 ret = regmap_read(map: info->rn5t618->regmap, RN5T618_CHGSTATE, val: &chgstate);
445 if (ret)
446 return ret;
447
448 online = !!(chgstate & CHG_STATE_ADP_INPUT);
449
450 switch (psp) {
451 case POWER_SUPPLY_PROP_ONLINE:
452 val->intval = online;
453 break;
454 case POWER_SUPPLY_PROP_STATUS:
455 if (!online) {
456 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
457 break;
458 }
459 val->intval = rn5t618_decode_status(status: chgstate);
460 if (val->intval != POWER_SUPPLY_STATUS_CHARGING)
461 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
462
463 break;
464 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
465 ret = regmap_read(map: info->rn5t618->regmap,
466 RN5T618_REGISET1, val: &regval);
467 if (ret < 0)
468 return ret;
469
470 val->intval = FROM_CUR_REG(regval);
471 break;
472 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
473 if (!info->channel_vadp)
474 return -ENODATA;
475
476 ret = iio_read_channel_processed_scale(chan: info->channel_vadp, val: &val->intval, scale: 1000);
477 if (ret < 0)
478 return ret;
479
480 break;
481 default:
482 return -EINVAL;
483 }
484
485 return 0;
486}
487
488static int rn5t618_adp_set_property(struct power_supply *psy,
489 enum power_supply_property psp,
490 const union power_supply_propval *val)
491{
492 struct rn5t618_power_info *info = power_supply_get_drvdata(psy);
493 int ret;
494
495 switch (psp) {
496 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
497 if (val->intval > ADP_MAX_CUR)
498 return -EINVAL;
499
500 if (val->intval < CHG_MIN_CUR)
501 return -EINVAL;
502
503 ret = regmap_write(map: info->rn5t618->regmap, RN5T618_REGISET1,
504 TO_CUR_REG(val->intval));
505 if (ret < 0)
506 return ret;
507
508 break;
509 default:
510 return -EINVAL;
511 }
512
513 return 0;
514}
515
516static int rn5t618_adp_property_is_writeable(struct power_supply *psy,
517 enum power_supply_property psp)
518{
519 switch (psp) {
520 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
521 return true;
522 default:
523 return false;
524 }
525}
526
527static int rc5t619_usb_get_type(struct rn5t618_power_info *info,
528 union power_supply_propval *val)
529{
530 unsigned int regval;
531 int ret;
532
533 ret = regmap_read(map: info->rn5t618->regmap, RN5T618_GCHGDET, val: &regval);
534 if (ret < 0)
535 return ret;
536
537 switch (regval & GCHGDET_TYPE_MASK) {
538 case GCHGDET_TYPE_SDP:
539 val->intval = POWER_SUPPLY_USB_TYPE_SDP;
540 break;
541 case GCHGDET_TYPE_CDP:
542 val->intval = POWER_SUPPLY_USB_TYPE_CDP;
543 break;
544 case GCHGDET_TYPE_DCP:
545 val->intval = POWER_SUPPLY_USB_TYPE_DCP;
546 break;
547 default:
548 val->intval = POWER_SUPPLY_USB_TYPE_UNKNOWN;
549 }
550
551 return 0;
552}
553
554static int rn5t618_usb_get_property(struct power_supply *psy,
555 enum power_supply_property psp,
556 union power_supply_propval *val)
557{
558 struct rn5t618_power_info *info = power_supply_get_drvdata(psy);
559 unsigned int chgstate;
560 unsigned int regval;
561 bool online;
562 int ret;
563
564 ret = regmap_read(map: info->rn5t618->regmap, RN5T618_CHGSTATE, val: &chgstate);
565 if (ret)
566 return ret;
567
568 online = !!(chgstate & CHG_STATE_USB_INPUT);
569
570 switch (psp) {
571 case POWER_SUPPLY_PROP_ONLINE:
572 val->intval = online;
573 break;
574 case POWER_SUPPLY_PROP_STATUS:
575 if (!online) {
576 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
577 break;
578 }
579 val->intval = rn5t618_decode_status(status: chgstate);
580 if (val->intval != POWER_SUPPLY_STATUS_CHARGING)
581 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
582
583 break;
584 case POWER_SUPPLY_PROP_USB_TYPE:
585 if (!online || (info->rn5t618->variant != RC5T619))
586 return -ENODATA;
587
588 return rc5t619_usb_get_type(info, val);
589 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
590 ret = regmap_read(map: info->rn5t618->regmap, RN5T618_CHGCTL1,
591 val: &regval);
592 if (ret < 0)
593 return ret;
594
595 val->intval = 0;
596 if (regval & 2) {
597 ret = regmap_read(map: info->rn5t618->regmap,
598 RN5T618_REGISET2,
599 val: &regval);
600 if (ret < 0)
601 return ret;
602
603 val->intval = FROM_CUR_REG(regval);
604 }
605 break;
606 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
607 if (!info->channel_vusb)
608 return -ENODATA;
609
610 ret = iio_read_channel_processed_scale(chan: info->channel_vusb, val: &val->intval, scale: 1000);
611 if (ret < 0)
612 return ret;
613
614 break;
615 default:
616 return -EINVAL;
617 }
618
619 return 0;
620}
621
622static int rn5t618_usb_set_property(struct power_supply *psy,
623 enum power_supply_property psp,
624 const union power_supply_propval *val)
625{
626 struct rn5t618_power_info *info = power_supply_get_drvdata(psy);
627 int ret;
628
629 switch (psp) {
630 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
631 if (val->intval > USB_MAX_CUR)
632 return -EINVAL;
633
634 if (val->intval < CHG_MIN_CUR)
635 return -EINVAL;
636
637 ret = regmap_write(map: info->rn5t618->regmap, RN5T618_REGISET2,
638 val: 0xE0 | TO_CUR_REG(val->intval));
639 if (ret < 0)
640 return ret;
641
642 break;
643 default:
644 return -EINVAL;
645 }
646
647 return 0;
648}
649
650static int rn5t618_usb_property_is_writeable(struct power_supply *psy,
651 enum power_supply_property psp)
652{
653 switch (psp) {
654 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
655 return true;
656 default:
657 return false;
658 }
659}
660
661static const struct power_supply_desc rn5t618_battery_desc = {
662 .name = "rn5t618-battery",
663 .type = POWER_SUPPLY_TYPE_BATTERY,
664 .properties = rn5t618_battery_props,
665 .num_properties = ARRAY_SIZE(rn5t618_battery_props),
666 .get_property = rn5t618_battery_get_property,
667 .set_property = rn5t618_battery_set_property,
668 .property_is_writeable = rn5t618_battery_property_is_writeable,
669};
670
671static const struct power_supply_desc rn5t618_adp_desc = {
672 .name = "rn5t618-adp",
673 .type = POWER_SUPPLY_TYPE_MAINS,
674 .properties = rn5t618_adp_props,
675 .num_properties = ARRAY_SIZE(rn5t618_adp_props),
676 .get_property = rn5t618_adp_get_property,
677 .set_property = rn5t618_adp_set_property,
678 .property_is_writeable = rn5t618_adp_property_is_writeable,
679};
680
681static const struct power_supply_desc rn5t618_usb_desc = {
682 .name = "rn5t618-usb",
683 .type = POWER_SUPPLY_TYPE_USB,
684 .usb_types = rn5t618_usb_types,
685 .num_usb_types = ARRAY_SIZE(rn5t618_usb_types),
686 .properties = rn5t618_usb_props,
687 .num_properties = ARRAY_SIZE(rn5t618_usb_props),
688 .get_property = rn5t618_usb_get_property,
689 .set_property = rn5t618_usb_set_property,
690 .property_is_writeable = rn5t618_usb_property_is_writeable,
691};
692
693static irqreturn_t rn5t618_charger_irq(int irq, void *data)
694{
695 struct device *dev = data;
696 struct rn5t618_power_info *info = dev_get_drvdata(dev);
697
698 unsigned int ctrl, stat1, stat2, err;
699
700 regmap_read(map: info->rn5t618->regmap, RN5T618_CHGERR_IRR, val: &err);
701 regmap_read(map: info->rn5t618->regmap, RN5T618_CHGCTRL_IRR, val: &ctrl);
702 regmap_read(map: info->rn5t618->regmap, RN5T618_CHGSTAT_IRR1, val: &stat1);
703 regmap_read(map: info->rn5t618->regmap, RN5T618_CHGSTAT_IRR2, val: &stat2);
704
705 regmap_write(map: info->rn5t618->regmap, RN5T618_CHGERR_IRR, val: 0);
706 regmap_write(map: info->rn5t618->regmap, RN5T618_CHGCTRL_IRR, val: 0);
707 regmap_write(map: info->rn5t618->regmap, RN5T618_CHGSTAT_IRR1, val: 0);
708 regmap_write(map: info->rn5t618->regmap, RN5T618_CHGSTAT_IRR2, val: 0);
709
710 dev_dbg(dev, "chgerr: %x chgctrl: %x chgstat: %x chgstat2: %x\n",
711 err, ctrl, stat1, stat2);
712
713 power_supply_changed(psy: info->usb);
714 power_supply_changed(psy: info->adp);
715 power_supply_changed(psy: info->battery);
716
717 return IRQ_HANDLED;
718}
719
720static int rn5t618_power_probe(struct platform_device *pdev)
721{
722 int ret = 0;
723 unsigned int v;
724 struct power_supply_config psy_cfg = {};
725 struct rn5t618_power_info *info;
726
727 info = devm_kzalloc(dev: &pdev->dev, size: sizeof(*info), GFP_KERNEL);
728 if (!info)
729 return -ENOMEM;
730
731 info->pdev = pdev;
732 info->rn5t618 = dev_get_drvdata(dev: pdev->dev.parent);
733 info->irq = -1;
734
735 platform_set_drvdata(pdev, data: info);
736
737 info->channel_vusb = devm_iio_channel_get(dev: &pdev->dev, consumer_channel: "vusb");
738 if (IS_ERR(ptr: info->channel_vusb)) {
739 if (PTR_ERR(ptr: info->channel_vusb) == -ENODEV)
740 return -EPROBE_DEFER;
741 return PTR_ERR(ptr: info->channel_vusb);
742 }
743
744 info->channel_vadp = devm_iio_channel_get(dev: &pdev->dev, consumer_channel: "vadp");
745 if (IS_ERR(ptr: info->channel_vadp)) {
746 if (PTR_ERR(ptr: info->channel_vadp) == -ENODEV)
747 return -EPROBE_DEFER;
748 return PTR_ERR(ptr: info->channel_vadp);
749 }
750
751 ret = regmap_read(map: info->rn5t618->regmap, RN5T618_CONTROL, val: &v);
752 if (ret)
753 return ret;
754
755 if (!(v & FG_ENABLE)) {
756 /* E.g. the vendor kernels of various Kobo and Tolino Ebook
757 * readers disable the fuel gauge on shutdown. If a kernel
758 * without fuel gauge support is booted after that, the fuel
759 * gauge will get decalibrated.
760 */
761 dev_info(&pdev->dev, "Fuel gauge not enabled, enabling now\n");
762 dev_info(&pdev->dev, "Expect imprecise results\n");
763 regmap_update_bits(map: info->rn5t618->regmap, RN5T618_CONTROL,
764 FG_ENABLE, FG_ENABLE);
765 }
766
767 psy_cfg.drv_data = info;
768 info->battery = devm_power_supply_register(parent: &pdev->dev,
769 desc: &rn5t618_battery_desc,
770 cfg: &psy_cfg);
771 if (IS_ERR(ptr: info->battery)) {
772 ret = PTR_ERR(ptr: info->battery);
773 dev_err(&pdev->dev, "failed to register battery: %d\n", ret);
774 return ret;
775 }
776
777 info->adp = devm_power_supply_register(parent: &pdev->dev,
778 desc: &rn5t618_adp_desc,
779 cfg: &psy_cfg);
780 if (IS_ERR(ptr: info->adp)) {
781 ret = PTR_ERR(ptr: info->adp);
782 dev_err(&pdev->dev, "failed to register adp: %d\n", ret);
783 return ret;
784 }
785
786 info->usb = devm_power_supply_register(parent: &pdev->dev,
787 desc: &rn5t618_usb_desc,
788 cfg: &psy_cfg);
789 if (IS_ERR(ptr: info->usb)) {
790 ret = PTR_ERR(ptr: info->usb);
791 dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
792 return ret;
793 }
794
795 if (info->rn5t618->irq_data)
796 info->irq = regmap_irq_get_virq(data: info->rn5t618->irq_data,
797 irq: RN5T618_IRQ_CHG);
798
799 if (info->irq < 0)
800 info->irq = -1;
801 else {
802 ret = devm_request_threaded_irq(dev: &pdev->dev, irq: info->irq, NULL,
803 thread_fn: rn5t618_charger_irq,
804 IRQF_ONESHOT,
805 devname: "rn5t618_power",
806 dev_id: &pdev->dev);
807
808 if (ret < 0) {
809 dev_err(&pdev->dev, "request IRQ:%d fail\n",
810 info->irq);
811 info->irq = -1;
812 }
813 }
814
815 return 0;
816}
817
818static struct platform_driver rn5t618_power_driver = {
819 .driver = {
820 .name = "rn5t618-power",
821 },
822 .probe = rn5t618_power_probe,
823};
824
825module_platform_driver(rn5t618_power_driver);
826MODULE_ALIAS("platform:rn5t618-power");
827MODULE_DESCRIPTION("Power supply driver for RICOH RN5T618");
828MODULE_LICENSE("GPL");
829

source code of linux/drivers/power/supply/rn5t618_power.c