1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Fuel gauge driver for CellWise 2013 / 2015
4  *
5  * Copyright (C) 2012, RockChip
6  * Copyright (C) 2020, Tobias Schramm
7  *
8  * Authors: xuhuicong <xhc@rock-chips.com>
9  * Authors: Tobias Schramm <t.schramm@manjaro.org>
10  */
11 
12 #include <linux/bits.h>
13 #include <linux/delay.h>
14 #include <linux/i2c.h>
15 #include <linux/gfp.h>
16 #include <linux/gpio/consumer.h>
17 #include <linux/kernel.h>
18 #include <linux/module.h>
19 #include <linux/power_supply.h>
20 #include <linux/property.h>
21 #include <linux/regmap.h>
22 #include <linux/time.h>
23 #include <linux/workqueue.h>
24 
25 #define CW2015_SIZE_BATINFO		64
26 
27 #define CW2015_RESET_TRIES		5
28 
29 #define CW2015_REG_VERSION		0x00
30 #define CW2015_REG_VCELL		0x02
31 #define CW2015_REG_SOC			0x04
32 #define CW2015_REG_RRT_ALERT		0x06
33 #define CW2015_REG_CONFIG		0x08
34 #define CW2015_REG_MODE			0x0A
35 #define CW2015_REG_BATINFO		0x10
36 
37 #define CW2015_MODE_SLEEP_MASK		GENMASK(7, 6)
38 #define CW2015_MODE_SLEEP		(0x03 << 6)
39 #define CW2015_MODE_NORMAL		(0x00 << 6)
40 #define CW2015_MODE_QUICK_START		(0x03 << 4)
41 #define CW2015_MODE_RESTART		(0x0f << 0)
42 
43 #define CW2015_CONFIG_UPDATE_FLG	(0x01 << 1)
44 #define CW2015_ATHD(x)			((x) << 3)
45 #define CW2015_MASK_ATHD		GENMASK(7, 3)
46 #define CW2015_MASK_SOC			GENMASK(12, 0)
47 
48 /* reset gauge of no valid state of charge could be polled for 40s */
49 #define CW2015_BAT_SOC_ERROR_MS		(40 * MSEC_PER_SEC)
50 /* reset gauge if state of charge stuck for half an hour during charging */
51 #define CW2015_BAT_CHARGING_STUCK_MS	(1800 * MSEC_PER_SEC)
52 
53 /* poll interval from CellWise GPL Android driver example */
54 #define CW2015_DEFAULT_POLL_INTERVAL_MS		8000
55 
56 #define CW2015_AVERAGING_SAMPLES		3
57 
58 struct cw_battery {
59 	struct device *dev;
60 	struct workqueue_struct *battery_workqueue;
61 	struct delayed_work battery_delay_work;
62 	struct regmap *regmap;
63 	struct power_supply *rk_bat;
64 	struct power_supply_battery_info *battery;
65 	u8 *bat_profile;
66 
67 	bool charger_attached;
68 	bool battery_changed;
69 
70 	int soc;
71 	int voltage_mv;
72 	int status;
73 	int time_to_empty;
74 	int charge_count;
75 
76 	u32 poll_interval_ms;
77 	u8 alert_level;
78 
79 	unsigned int read_errors;
80 	unsigned int charge_stuck_cnt;
81 };
82 
83 static int cw_read_word(struct cw_battery *cw_bat, u8 reg, u16 *val)
84 {
85 	__be16 value;
86 	int ret;
87 
88 	ret = regmap_bulk_read(cw_bat->regmap, reg, &value, sizeof(value));
89 	if (ret)
90 		return ret;
91 
92 	*val = be16_to_cpu(value);
93 	return 0;
94 }
95 
96 static int cw_update_profile(struct cw_battery *cw_bat)
97 {
98 	int ret;
99 	unsigned int reg_val;
100 	u8 reset_val;
101 
102 	/* make sure gauge is not in sleep mode */
103 	ret = regmap_read(cw_bat->regmap, CW2015_REG_MODE, &reg_val);
104 	if (ret)
105 		return ret;
106 
107 	reset_val = reg_val;
108 	if ((reg_val & CW2015_MODE_SLEEP_MASK) == CW2015_MODE_SLEEP) {
109 		dev_err(cw_bat->dev,
110 			"Gauge is in sleep mode, can't update battery info\n");
111 		return -EINVAL;
112 	}
113 
114 	/* write new battery info */
115 	ret = regmap_raw_write(cw_bat->regmap, CW2015_REG_BATINFO,
116 			       cw_bat->bat_profile,
117 			       CW2015_SIZE_BATINFO);
118 	if (ret)
119 		return ret;
120 
121 	/* set config update flag  */
122 	reg_val |= CW2015_CONFIG_UPDATE_FLG;
123 	reg_val &= ~CW2015_MASK_ATHD;
124 	reg_val |= CW2015_ATHD(cw_bat->alert_level);
125 	ret = regmap_write(cw_bat->regmap, CW2015_REG_CONFIG, reg_val);
126 	if (ret)
127 		return ret;
128 
129 	/* reset gauge to apply new battery profile */
130 	reset_val &= ~CW2015_MODE_RESTART;
131 	reg_val = reset_val | CW2015_MODE_RESTART;
132 	ret = regmap_write(cw_bat->regmap, CW2015_REG_MODE, reg_val);
133 	if (ret)
134 		return ret;
135 
136 	/* wait for gauge to reset */
137 	msleep(20);
138 
139 	/* clear reset flag */
140 	ret = regmap_write(cw_bat->regmap, CW2015_REG_MODE, reset_val);
141 	if (ret)
142 		return ret;
143 
144 	/* wait for gauge to become ready */
145 	ret = regmap_read_poll_timeout(cw_bat->regmap, CW2015_REG_SOC,
146 				       reg_val, reg_val <= 100,
147 				       10 * USEC_PER_MSEC, 10 * USEC_PER_SEC);
148 	if (ret)
149 		dev_err(cw_bat->dev,
150 			"Gauge did not become ready after profile upload\n");
151 	else
152 		dev_dbg(cw_bat->dev, "Battery profile updated\n");
153 
154 	return ret;
155 }
156 
157 static int cw_init(struct cw_battery *cw_bat)
158 {
159 	int ret;
160 	unsigned int reg_val = CW2015_MODE_SLEEP;
161 
162 	if ((reg_val & CW2015_MODE_SLEEP_MASK) == CW2015_MODE_SLEEP) {
163 		reg_val = CW2015_MODE_NORMAL;
164 		ret = regmap_write(cw_bat->regmap, CW2015_REG_MODE, reg_val);
165 		if (ret)
166 			return ret;
167 	}
168 
169 	ret = regmap_read(cw_bat->regmap, CW2015_REG_CONFIG, &reg_val);
170 	if (ret)
171 		return ret;
172 
173 	if ((reg_val & CW2015_MASK_ATHD) != CW2015_ATHD(cw_bat->alert_level)) {
174 		dev_dbg(cw_bat->dev, "Setting new alert level\n");
175 		reg_val &= ~CW2015_MASK_ATHD;
176 		reg_val |= ~CW2015_ATHD(cw_bat->alert_level);
177 		ret = regmap_write(cw_bat->regmap, CW2015_REG_CONFIG, reg_val);
178 		if (ret)
179 			return ret;
180 	}
181 
182 	ret = regmap_read(cw_bat->regmap, CW2015_REG_CONFIG, &reg_val);
183 	if (ret)
184 		return ret;
185 
186 	if (!(reg_val & CW2015_CONFIG_UPDATE_FLG)) {
187 		dev_dbg(cw_bat->dev,
188 			"Battery profile not present, uploading battery profile\n");
189 		if (cw_bat->bat_profile) {
190 			ret = cw_update_profile(cw_bat);
191 			if (ret) {
192 				dev_err(cw_bat->dev,
193 					"Failed to upload battery profile\n");
194 				return ret;
195 			}
196 		} else {
197 			dev_warn(cw_bat->dev,
198 				 "No profile specified, continuing without profile\n");
199 		}
200 	} else if (cw_bat->bat_profile) {
201 		u8 bat_info[CW2015_SIZE_BATINFO];
202 
203 		ret = regmap_raw_read(cw_bat->regmap, CW2015_REG_BATINFO,
204 				      bat_info, CW2015_SIZE_BATINFO);
205 		if (ret) {
206 			dev_err(cw_bat->dev,
207 				"Failed to read stored battery profile\n");
208 			return ret;
209 		}
210 
211 		if (memcmp(bat_info, cw_bat->bat_profile, CW2015_SIZE_BATINFO)) {
212 			dev_warn(cw_bat->dev, "Replacing stored battery profile\n");
213 			ret = cw_update_profile(cw_bat);
214 			if (ret)
215 				return ret;
216 		}
217 	} else {
218 		dev_warn(cw_bat->dev,
219 			 "Can't check current battery profile, no profile provided\n");
220 	}
221 
222 	dev_dbg(cw_bat->dev, "Battery profile configured\n");
223 	return 0;
224 }
225 
226 static int cw_power_on_reset(struct cw_battery *cw_bat)
227 {
228 	int ret;
229 	unsigned char reset_val;
230 
231 	reset_val = CW2015_MODE_SLEEP;
232 	ret = regmap_write(cw_bat->regmap, CW2015_REG_MODE, reset_val);
233 	if (ret)
234 		return ret;
235 
236 	/* wait for gauge to enter sleep */
237 	msleep(20);
238 
239 	reset_val = CW2015_MODE_NORMAL;
240 	ret = regmap_write(cw_bat->regmap, CW2015_REG_MODE, reset_val);
241 	if (ret)
242 		return ret;
243 
244 	ret = cw_init(cw_bat);
245 	if (ret)
246 		return ret;
247 	return 0;
248 }
249 
250 #define HYSTERESIS(current, previous, up, down) \
251 	(((current) < (previous) + (up)) && ((current) > (previous) - (down)))
252 
253 static int cw_get_soc(struct cw_battery *cw_bat)
254 {
255 	unsigned int soc;
256 	int ret;
257 
258 	ret = regmap_read(cw_bat->regmap, CW2015_REG_SOC, &soc);
259 	if (ret)
260 		return ret;
261 
262 	if (soc > 100) {
263 		int max_error_cycles =
264 			CW2015_BAT_SOC_ERROR_MS / cw_bat->poll_interval_ms;
265 
266 		dev_err(cw_bat->dev, "Invalid SoC %d%%\n", soc);
267 		cw_bat->read_errors++;
268 		if (cw_bat->read_errors > max_error_cycles) {
269 			dev_warn(cw_bat->dev,
270 				 "Too many invalid SoC reports, resetting gauge\n");
271 			cw_power_on_reset(cw_bat);
272 			cw_bat->read_errors = 0;
273 		}
274 		return cw_bat->soc;
275 	}
276 	cw_bat->read_errors = 0;
277 
278 	/* Reset gauge if stuck while charging */
279 	if (cw_bat->status == POWER_SUPPLY_STATUS_CHARGING && soc == cw_bat->soc) {
280 		int max_stuck_cycles =
281 			CW2015_BAT_CHARGING_STUCK_MS / cw_bat->poll_interval_ms;
282 
283 		cw_bat->charge_stuck_cnt++;
284 		if (cw_bat->charge_stuck_cnt > max_stuck_cycles) {
285 			dev_warn(cw_bat->dev,
286 				 "SoC stuck @%u%%, resetting gauge\n", soc);
287 			cw_power_on_reset(cw_bat);
288 			cw_bat->charge_stuck_cnt = 0;
289 		}
290 	} else {
291 		cw_bat->charge_stuck_cnt = 0;
292 	}
293 
294 	/* Ignore voltage dips during charge */
295 	if (cw_bat->charger_attached && HYSTERESIS(soc, cw_bat->soc, 0, 3))
296 		soc = cw_bat->soc;
297 
298 	/* Ignore voltage spikes during discharge */
299 	if (!cw_bat->charger_attached && HYSTERESIS(soc, cw_bat->soc, 3, 0))
300 		soc = cw_bat->soc;
301 
302 	return soc;
303 }
304 
305 static int cw_get_voltage(struct cw_battery *cw_bat)
306 {
307 	int ret, i, voltage_mv;
308 	u16 reg_val;
309 	u32 avg = 0;
310 
311 	for (i = 0; i < CW2015_AVERAGING_SAMPLES; i++) {
312 		ret = cw_read_word(cw_bat, CW2015_REG_VCELL, &reg_val);
313 		if (ret)
314 			return ret;
315 
316 		avg += reg_val;
317 	}
318 	avg /= CW2015_AVERAGING_SAMPLES;
319 
320 	/*
321 	 * 305 uV per ADC step
322 	 * Use 312 / 1024  as efficient approximation of 305 / 1000
323 	 * Negligible error of 0.1%
324 	 */
325 	voltage_mv = avg * 312 / 1024;
326 
327 	dev_dbg(cw_bat->dev, "Read voltage: %d mV, raw=0x%04x\n",
328 		voltage_mv, reg_val);
329 	return voltage_mv;
330 }
331 
332 static int cw_get_time_to_empty(struct cw_battery *cw_bat)
333 {
334 	int ret;
335 	u16 value16;
336 
337 	ret = cw_read_word(cw_bat, CW2015_REG_RRT_ALERT, &value16);
338 	if (ret)
339 		return ret;
340 
341 	return value16 & CW2015_MASK_SOC;
342 }
343 
344 static void cw_update_charge_status(struct cw_battery *cw_bat)
345 {
346 	int ret;
347 
348 	ret = power_supply_am_i_supplied(cw_bat->rk_bat);
349 	if (ret < 0) {
350 		dev_warn(cw_bat->dev, "Failed to get supply state: %d\n", ret);
351 	} else {
352 		bool charger_attached;
353 
354 		charger_attached = !!ret;
355 		if (cw_bat->charger_attached != charger_attached) {
356 			cw_bat->battery_changed = true;
357 			if (charger_attached)
358 				cw_bat->charge_count++;
359 		}
360 		cw_bat->charger_attached = charger_attached;
361 	}
362 }
363 
364 static void cw_update_soc(struct cw_battery *cw_bat)
365 {
366 	int soc;
367 
368 	soc = cw_get_soc(cw_bat);
369 	if (soc < 0)
370 		dev_err(cw_bat->dev, "Failed to get SoC from gauge: %d\n", soc);
371 	else if (cw_bat->soc != soc) {
372 		cw_bat->soc = soc;
373 		cw_bat->battery_changed = true;
374 	}
375 }
376 
377 static void cw_update_voltage(struct cw_battery *cw_bat)
378 {
379 	int voltage_mv;
380 
381 	voltage_mv = cw_get_voltage(cw_bat);
382 	if (voltage_mv < 0)
383 		dev_err(cw_bat->dev, "Failed to get voltage from gauge: %d\n",
384 			voltage_mv);
385 	else
386 		cw_bat->voltage_mv = voltage_mv;
387 }
388 
389 static void cw_update_status(struct cw_battery *cw_bat)
390 {
391 	int status = POWER_SUPPLY_STATUS_DISCHARGING;
392 
393 	if (cw_bat->charger_attached) {
394 		if (cw_bat->soc >= 100)
395 			status = POWER_SUPPLY_STATUS_FULL;
396 		else
397 			status = POWER_SUPPLY_STATUS_CHARGING;
398 	}
399 
400 	if (cw_bat->status != status)
401 		cw_bat->battery_changed = true;
402 	cw_bat->status = status;
403 }
404 
405 static void cw_update_time_to_empty(struct cw_battery *cw_bat)
406 {
407 	int time_to_empty;
408 
409 	time_to_empty = cw_get_time_to_empty(cw_bat);
410 	if (time_to_empty < 0)
411 		dev_err(cw_bat->dev, "Failed to get time to empty from gauge: %d\n",
412 			time_to_empty);
413 	else if (cw_bat->time_to_empty != time_to_empty) {
414 		cw_bat->time_to_empty = time_to_empty;
415 		cw_bat->battery_changed = true;
416 	}
417 }
418 
419 static void cw_bat_work(struct work_struct *work)
420 {
421 	struct delayed_work *delay_work;
422 	struct cw_battery *cw_bat;
423 	int ret;
424 	unsigned int reg_val;
425 
426 	delay_work = to_delayed_work(work);
427 	cw_bat = container_of(delay_work, struct cw_battery, battery_delay_work);
428 	ret = regmap_read(cw_bat->regmap, CW2015_REG_MODE, &reg_val);
429 	if (ret) {
430 		dev_err(cw_bat->dev, "Failed to read mode from gauge: %d\n", ret);
431 	} else {
432 		if ((reg_val & CW2015_MODE_SLEEP_MASK) == CW2015_MODE_SLEEP) {
433 			int i;
434 
435 			for (i = 0; i < CW2015_RESET_TRIES; i++) {
436 				if (!cw_power_on_reset(cw_bat))
437 					break;
438 			}
439 		}
440 		cw_update_soc(cw_bat);
441 		cw_update_voltage(cw_bat);
442 		cw_update_charge_status(cw_bat);
443 		cw_update_status(cw_bat);
444 		cw_update_time_to_empty(cw_bat);
445 	}
446 	dev_dbg(cw_bat->dev, "charger_attached = %d\n", cw_bat->charger_attached);
447 	dev_dbg(cw_bat->dev, "status = %d\n", cw_bat->status);
448 	dev_dbg(cw_bat->dev, "soc = %d%%\n", cw_bat->soc);
449 	dev_dbg(cw_bat->dev, "voltage = %dmV\n", cw_bat->voltage_mv);
450 
451 	if (cw_bat->battery_changed)
452 		power_supply_changed(cw_bat->rk_bat);
453 	cw_bat->battery_changed = false;
454 
455 	queue_delayed_work(cw_bat->battery_workqueue,
456 			   &cw_bat->battery_delay_work,
457 			   msecs_to_jiffies(cw_bat->poll_interval_ms));
458 }
459 
460 static bool cw_battery_valid_time_to_empty(struct cw_battery *cw_bat)
461 {
462 	return	cw_bat->time_to_empty > 0 &&
463 		cw_bat->time_to_empty < CW2015_MASK_SOC &&
464 		cw_bat->status == POWER_SUPPLY_STATUS_DISCHARGING;
465 }
466 
467 static int cw_battery_get_property(struct power_supply *psy,
468 				   enum power_supply_property psp,
469 				   union power_supply_propval *val)
470 {
471 	struct cw_battery *cw_bat;
472 
473 	cw_bat = power_supply_get_drvdata(psy);
474 	switch (psp) {
475 	case POWER_SUPPLY_PROP_CAPACITY:
476 		val->intval = cw_bat->soc;
477 		break;
478 
479 	case POWER_SUPPLY_PROP_STATUS:
480 		val->intval = cw_bat->status;
481 		break;
482 
483 	case POWER_SUPPLY_PROP_PRESENT:
484 		val->intval = !!cw_bat->voltage_mv;
485 		break;
486 
487 	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
488 		val->intval = cw_bat->voltage_mv * 1000;
489 		break;
490 
491 	case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
492 		if (cw_battery_valid_time_to_empty(cw_bat))
493 			val->intval = cw_bat->time_to_empty;
494 		else
495 			val->intval = 0;
496 		break;
497 
498 	case POWER_SUPPLY_PROP_TECHNOLOGY:
499 		val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
500 		break;
501 
502 	case POWER_SUPPLY_PROP_CHARGE_COUNTER:
503 		val->intval = cw_bat->charge_count;
504 		break;
505 
506 	case POWER_SUPPLY_PROP_CHARGE_FULL:
507 	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
508 		if (cw_bat->battery->charge_full_design_uah > 0)
509 			val->intval = cw_bat->battery->charge_full_design_uah;
510 		else
511 			val->intval = 0;
512 		break;
513 
514 	case POWER_SUPPLY_PROP_CHARGE_NOW:
515 		val->intval = cw_bat->battery->charge_full_design_uah;
516 		val->intval = val->intval * cw_bat->soc / 100;
517 		break;
518 
519 	case POWER_SUPPLY_PROP_CURRENT_NOW:
520 		if (cw_battery_valid_time_to_empty(cw_bat) &&
521 		    cw_bat->battery->charge_full_design_uah > 0) {
522 			/* calculate remaining capacity */
523 			val->intval = cw_bat->battery->charge_full_design_uah;
524 			val->intval = val->intval * cw_bat->soc / 100;
525 
526 			/* estimate current based on time to empty */
527 			val->intval = 60 * val->intval / cw_bat->time_to_empty;
528 		} else {
529 			val->intval = 0;
530 		}
531 
532 		break;
533 
534 	default:
535 		break;
536 	}
537 	return 0;
538 }
539 
540 static enum power_supply_property cw_battery_properties[] = {
541 	POWER_SUPPLY_PROP_CAPACITY,
542 	POWER_SUPPLY_PROP_STATUS,
543 	POWER_SUPPLY_PROP_PRESENT,
544 	POWER_SUPPLY_PROP_VOLTAGE_NOW,
545 	POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
546 	POWER_SUPPLY_PROP_TECHNOLOGY,
547 	POWER_SUPPLY_PROP_CHARGE_COUNTER,
548 	POWER_SUPPLY_PROP_CHARGE_FULL,
549 	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
550 	POWER_SUPPLY_PROP_CHARGE_NOW,
551 	POWER_SUPPLY_PROP_CURRENT_NOW,
552 };
553 
554 static const struct power_supply_desc cw2015_bat_desc = {
555 	.name		= "cw2015-battery",
556 	.type		= POWER_SUPPLY_TYPE_BATTERY,
557 	.properties	= cw_battery_properties,
558 	.num_properties	= ARRAY_SIZE(cw_battery_properties),
559 	.get_property	= cw_battery_get_property,
560 };
561 
562 static int cw2015_parse_properties(struct cw_battery *cw_bat)
563 {
564 	struct device *dev = cw_bat->dev;
565 	int length;
566 	int ret;
567 
568 	length = device_property_count_u8(dev, "cellwise,battery-profile");
569 	if (length < 0) {
570 		dev_warn(cw_bat->dev,
571 			 "No battery-profile found, using current flash contents\n");
572 	} else if (length != CW2015_SIZE_BATINFO) {
573 		dev_err(cw_bat->dev, "battery-profile must be %d bytes\n",
574 			CW2015_SIZE_BATINFO);
575 		return -EINVAL;
576 	} else {
577 		cw_bat->bat_profile = devm_kzalloc(dev, length, GFP_KERNEL);
578 		if (!cw_bat->bat_profile)
579 			return -ENOMEM;
580 
581 		ret = device_property_read_u8_array(dev,
582 						"cellwise,battery-profile",
583 						cw_bat->bat_profile,
584 						length);
585 		if (ret)
586 			return ret;
587 	}
588 
589 	ret = device_property_read_u32(dev, "cellwise,monitor-interval-ms",
590 				       &cw_bat->poll_interval_ms);
591 	if (ret) {
592 		dev_dbg(cw_bat->dev, "Using default poll interval\n");
593 		cw_bat->poll_interval_ms = CW2015_DEFAULT_POLL_INTERVAL_MS;
594 	}
595 
596 	return 0;
597 }
598 
599 static const struct regmap_range regmap_ranges_rd_yes[] = {
600 	regmap_reg_range(CW2015_REG_VERSION, CW2015_REG_VERSION),
601 	regmap_reg_range(CW2015_REG_VCELL, CW2015_REG_CONFIG),
602 	regmap_reg_range(CW2015_REG_MODE, CW2015_REG_MODE),
603 	regmap_reg_range(CW2015_REG_BATINFO,
604 			CW2015_REG_BATINFO + CW2015_SIZE_BATINFO - 1),
605 };
606 
607 static const struct regmap_access_table regmap_rd_table = {
608 	.yes_ranges = regmap_ranges_rd_yes,
609 	.n_yes_ranges = 4,
610 };
611 
612 static const struct regmap_range regmap_ranges_wr_yes[] = {
613 	regmap_reg_range(CW2015_REG_RRT_ALERT, CW2015_REG_CONFIG),
614 	regmap_reg_range(CW2015_REG_MODE, CW2015_REG_MODE),
615 	regmap_reg_range(CW2015_REG_BATINFO,
616 			CW2015_REG_BATINFO + CW2015_SIZE_BATINFO - 1),
617 };
618 
619 static const struct regmap_access_table regmap_wr_table = {
620 	.yes_ranges = regmap_ranges_wr_yes,
621 	.n_yes_ranges = 3,
622 };
623 
624 static const struct regmap_range regmap_ranges_vol_yes[] = {
625 	regmap_reg_range(CW2015_REG_VCELL, CW2015_REG_SOC + 1),
626 };
627 
628 static const struct regmap_access_table regmap_vol_table = {
629 	.yes_ranges = regmap_ranges_vol_yes,
630 	.n_yes_ranges = 1,
631 };
632 
633 static const struct regmap_config cw2015_regmap_config = {
634 	.reg_bits = 8,
635 	.val_bits = 8,
636 	.rd_table = &regmap_rd_table,
637 	.wr_table = &regmap_wr_table,
638 	.volatile_table = &regmap_vol_table,
639 	.max_register = CW2015_REG_BATINFO + CW2015_SIZE_BATINFO - 1,
640 };
641 
642 static int cw_bat_probe(struct i2c_client *client)
643 {
644 	int ret;
645 	struct cw_battery *cw_bat;
646 	struct power_supply_config psy_cfg = { 0 };
647 
648 	cw_bat = devm_kzalloc(&client->dev, sizeof(*cw_bat), GFP_KERNEL);
649 	if (!cw_bat)
650 		return -ENOMEM;
651 
652 	i2c_set_clientdata(client, cw_bat);
653 	cw_bat->dev = &client->dev;
654 	cw_bat->soc = 1;
655 
656 	ret = cw2015_parse_properties(cw_bat);
657 	if (ret) {
658 		dev_err(cw_bat->dev, "Failed to parse cw2015 properties\n");
659 		return ret;
660 	}
661 
662 	cw_bat->regmap = devm_regmap_init_i2c(client, &cw2015_regmap_config);
663 	if (IS_ERR(cw_bat->regmap)) {
664 		dev_err(cw_bat->dev, "Failed to allocate regmap: %ld\n",
665 			PTR_ERR(cw_bat->regmap));
666 		return PTR_ERR(cw_bat->regmap);
667 	}
668 
669 	ret = cw_init(cw_bat);
670 	if (ret) {
671 		dev_err(cw_bat->dev, "Init failed: %d\n", ret);
672 		return ret;
673 	}
674 
675 	psy_cfg.drv_data = cw_bat;
676 	psy_cfg.fwnode = dev_fwnode(cw_bat->dev);
677 
678 	cw_bat->rk_bat = devm_power_supply_register(&client->dev,
679 						    &cw2015_bat_desc,
680 						    &psy_cfg);
681 	if (IS_ERR(cw_bat->rk_bat)) {
682 		/* try again if this happens */
683 		dev_err_probe(&client->dev, PTR_ERR(cw_bat->rk_bat),
684 			"Failed to register power supply\n");
685 		return PTR_ERR(cw_bat->rk_bat);
686 	}
687 
688 	ret = power_supply_get_battery_info(cw_bat->rk_bat, &cw_bat->battery);
689 	if (ret) {
690 		/* Allocate an empty battery */
691 		cw_bat->battery = devm_kzalloc(&client->dev,
692 					       sizeof(*cw_bat->battery),
693 					       GFP_KERNEL);
694 		if (!cw_bat->battery)
695 			return -ENOMEM;
696 		dev_warn(cw_bat->dev,
697 			 "No monitored battery, some properties will be missing\n");
698 	}
699 
700 	cw_bat->battery_workqueue = create_singlethread_workqueue("rk_battery");
701 	INIT_DELAYED_WORK(&cw_bat->battery_delay_work, cw_bat_work);
702 	queue_delayed_work(cw_bat->battery_workqueue,
703 			   &cw_bat->battery_delay_work, msecs_to_jiffies(10));
704 	return 0;
705 }
706 
707 static int __maybe_unused cw_bat_suspend(struct device *dev)
708 {
709 	struct i2c_client *client = to_i2c_client(dev);
710 	struct cw_battery *cw_bat = i2c_get_clientdata(client);
711 
712 	cancel_delayed_work_sync(&cw_bat->battery_delay_work);
713 	return 0;
714 }
715 
716 static int __maybe_unused cw_bat_resume(struct device *dev)
717 {
718 	struct i2c_client *client = to_i2c_client(dev);
719 	struct cw_battery *cw_bat = i2c_get_clientdata(client);
720 
721 	queue_delayed_work(cw_bat->battery_workqueue,
722 			   &cw_bat->battery_delay_work, 0);
723 	return 0;
724 }
725 
726 static SIMPLE_DEV_PM_OPS(cw_bat_pm_ops, cw_bat_suspend, cw_bat_resume);
727 
728 static int cw_bat_remove(struct i2c_client *client)
729 {
730 	struct cw_battery *cw_bat = i2c_get_clientdata(client);
731 
732 	cancel_delayed_work_sync(&cw_bat->battery_delay_work);
733 	power_supply_put_battery_info(cw_bat->rk_bat, cw_bat->battery);
734 	return 0;
735 }
736 
737 static const struct i2c_device_id cw_bat_id_table[] = {
738 	{ "cw2015", 0 },
739 	{ }
740 };
741 
742 static const struct of_device_id cw2015_of_match[] = {
743 	{ .compatible = "cellwise,cw2015" },
744 	{ }
745 };
746 MODULE_DEVICE_TABLE(of, cw2015_of_match);
747 
748 static struct i2c_driver cw_bat_driver = {
749 	.driver = {
750 		.name = "cw2015",
751 		.of_match_table = cw2015_of_match,
752 		.pm = &cw_bat_pm_ops,
753 	},
754 	.probe_new = cw_bat_probe,
755 	.remove = cw_bat_remove,
756 	.id_table = cw_bat_id_table,
757 };
758 
759 module_i2c_driver(cw_bat_driver);
760 
761 MODULE_AUTHOR("xhc<xhc@rock-chips.com>");
762 MODULE_AUTHOR("Tobias Schramm <t.schramm@manjaro.org>");
763 MODULE_DESCRIPTION("cw2015/cw2013 battery driver");
764 MODULE_LICENSE("GPL");
765