1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Charger Driver for Rockchip rk817
4  *
5  * Copyright (c) 2021 Maya Matuszczyk <maccraft123mc@gmail.com>
6  *
7  * Authors: Maya Matuszczyk <maccraft123mc@gmail.com>
8  *	    Chris Morgan <macromorgan@hotmail.com>
9  */
10 
11 #include <asm/unaligned.h>
12 #include <linux/devm-helpers.h>
13 #include <linux/mfd/rk808.h>
14 #include <linux/irq.h>
15 #include <linux/of.h>
16 #include <linux/platform_device.h>
17 #include <linux/power_supply.h>
18 #include <linux/regmap.h>
19 
20 /* Charging statuses reported by hardware register */
21 enum rk817_charge_status {
22 	CHRG_OFF,
23 	DEAD_CHRG,
24 	TRICKLE_CHRG,
25 	CC_OR_CV_CHRG,
26 	CHARGE_FINISH,
27 	USB_OVER_VOL,
28 	BAT_TMP_ERR,
29 	BAT_TIM_ERR,
30 };
31 
32 /*
33  * Max charging current read to/written from hardware register.
34  * Note how highest value corresponding to 0x7 is the lowest
35  * current, this is per the datasheet.
36  */
37 enum rk817_chg_cur {
38 	CHG_1A,
39 	CHG_1_5A,
40 	CHG_2A,
41 	CHG_2_5A,
42 	CHG_2_75A,
43 	CHG_3A,
44 	CHG_3_5A,
45 	CHG_0_5A,
46 };
47 
48 struct rk817_charger {
49 	struct device *dev;
50 	struct rk808 *rk808;
51 
52 	struct power_supply *bat_ps;
53 	struct power_supply *chg_ps;
54 	bool plugged_in;
55 	bool battery_present;
56 
57 	/*
58 	 * voltage_k and voltage_b values are used to calibrate the ADC
59 	 * voltage readings. While they are documented in the BSP kernel and
60 	 * datasheet as voltage_k and voltage_b, there is no further
61 	 * information explaining them in more detail.
62 	 */
63 
64 	uint32_t voltage_k;
65 	uint32_t voltage_b;
66 
67 	/*
68 	 * soc - state of charge - like the BSP this is stored as a percentage,
69 	 * to the thousandth. BSP has a display state of charge (dsoc) and a
70 	 * remaining state of charge (rsoc). This value will be used for both
71 	 * purposes here so we don't do any fancy math to try and "smooth" the
72 	 * charge and just report it as it is. Note for example an soc of 100
73 	 * is stored as 100000, an soc of 50 is stored as 50000, etc.
74 	 */
75 	int soc;
76 
77 	/*
78 	 * Capacity of battery when fully charged, equal or less than design
79 	 * capacity depending upon wear. BSP kernel saves to nvram in mAh,
80 	 * so this value is in mAh not the standard uAh.
81 	 */
82 	int fcc_mah;
83 
84 	/*
85 	 * Calibrate the SOC on a fully charged battery, this way we can use
86 	 * the calibrated SOC value to correct for columb counter drift.
87 	 */
88 	bool soc_cal;
89 
90 	/* Implementation specific immutable properties from device tree */
91 	int res_div;
92 	int sleep_enter_current_ua;
93 	int sleep_filter_current_ua;
94 	int bat_charge_full_design_uah;
95 	int bat_voltage_min_design_uv;
96 	int bat_voltage_max_design_uv;
97 
98 	/* Values updated periodically by driver for display. */
99 	int charge_now_uah;
100 	int volt_avg_uv;
101 	int cur_avg_ua;
102 	int max_chg_cur_ua;
103 	int max_chg_volt_uv;
104 	int charge_status;
105 	int charger_input_volt_avg_uv;
106 
107 	/* Work queue to periodically update values. */
108 	struct delayed_work work;
109 };
110 
111 /* ADC coefficients extracted from BSP kernel */
112 #define ADC_TO_CURRENT(adc_value, res_div)	\
113 	(adc_value * 172 / res_div)
114 
115 #define CURRENT_TO_ADC(current, samp_res)	\
116 	(current * samp_res / 172)
117 
118 #define CHARGE_TO_ADC(capacity, res_div)	\
119 	(capacity * res_div * 3600 / 172 * 1000)
120 
121 #define ADC_TO_CHARGE_UAH(adc_value, res_div)	\
122 	(adc_value / 3600 * 172 / res_div)
123 
124 static int rk817_chg_cur_to_reg(u32 chg_cur_ma)
125 {
126 	if (chg_cur_ma >= 3500)
127 		return CHG_3_5A;
128 	else if (chg_cur_ma >= 3000)
129 		return CHG_3A;
130 	else if (chg_cur_ma >= 2750)
131 		return CHG_2_75A;
132 	else if (chg_cur_ma >= 2500)
133 		return CHG_2_5A;
134 	else if (chg_cur_ma >= 2000)
135 		return CHG_2A;
136 	else if (chg_cur_ma >= 1500)
137 		return CHG_1_5A;
138 	else if (chg_cur_ma >= 1000)
139 		return CHG_1A;
140 	else if (chg_cur_ma >= 500)
141 		return CHG_0_5A;
142 	else
143 		return -EINVAL;
144 }
145 
146 static int rk817_chg_cur_from_reg(u8 reg)
147 {
148 	switch (reg) {
149 	case CHG_0_5A:
150 		return 500000;
151 	case CHG_1A:
152 		return 1000000;
153 	case CHG_1_5A:
154 		return 1500000;
155 	case CHG_2A:
156 		return 2000000;
157 	case CHG_2_5A:
158 		return 2500000;
159 	case CHG_2_75A:
160 		return 2750000;
161 	case CHG_3A:
162 		return 3000000;
163 	case CHG_3_5A:
164 		return 3500000;
165 	default:
166 		return -EINVAL;
167 	}
168 }
169 
170 static void rk817_bat_calib_vol(struct rk817_charger *charger)
171 {
172 	uint32_t vcalib0 = 0;
173 	uint32_t vcalib1 = 0;
174 	u8 bulk_reg[2];
175 
176 	/* calibrate voltage */
177 	regmap_bulk_read(charger->rk808->regmap, RK817_GAS_GAUGE_VCALIB0_H,
178 			 bulk_reg, 2);
179 	vcalib0 = get_unaligned_be16(bulk_reg);
180 
181 	regmap_bulk_read(charger->rk808->regmap, RK817_GAS_GAUGE_VCALIB1_H,
182 			 bulk_reg, 2);
183 	vcalib1 = get_unaligned_be16(bulk_reg);
184 
185 	/* values were taken from BSP kernel */
186 	charger->voltage_k = (4025 - 2300) * 1000 /
187 			     ((vcalib1 - vcalib0) ? (vcalib1 - vcalib0) : 1);
188 	charger->voltage_b = 4025 - (charger->voltage_k * vcalib1) / 1000;
189 }
190 
191 static void rk817_bat_calib_cur(struct rk817_charger *charger)
192 {
193 	u8 bulk_reg[2];
194 
195 	/* calibrate current */
196 	regmap_bulk_read(charger->rk808->regmap, RK817_GAS_GAUGE_IOFFSET_H,
197 			 bulk_reg, 2);
198 	regmap_bulk_write(charger->rk808->regmap, RK817_GAS_GAUGE_CAL_OFFSET_H,
199 			  bulk_reg, 2);
200 }
201 
202 /*
203  * note that only the fcc_mah is really used by this driver, the other values
204  * are to ensure we can remain backwards compatible with the BSP kernel.
205  */
206 static int rk817_record_battery_nvram_values(struct rk817_charger *charger)
207 {
208 	u8 bulk_reg[3];
209 	int ret, rsoc;
210 
211 	/*
212 	 * write the soc value to the nvram location used by the BSP kernel
213 	 * for the dsoc value.
214 	 */
215 	put_unaligned_le24(charger->soc, bulk_reg);
216 	ret = regmap_bulk_write(charger->rk808->regmap, RK817_GAS_GAUGE_BAT_R1,
217 				bulk_reg, 3);
218 	if (ret < 0)
219 		return ret;
220 	/*
221 	 * write the remaining capacity in mah to the nvram location used by
222 	 * the BSP kernel for the rsoc value.
223 	 */
224 	rsoc = (charger->soc * charger->fcc_mah) / 100000;
225 	put_unaligned_le24(rsoc, bulk_reg);
226 	ret = regmap_bulk_write(charger->rk808->regmap, RK817_GAS_GAUGE_DATA0,
227 				bulk_reg, 3);
228 	if (ret < 0)
229 		return ret;
230 	/* write the fcc_mah in mAh, just as the BSP kernel does. */
231 	put_unaligned_le24(charger->fcc_mah, bulk_reg);
232 	ret = regmap_bulk_write(charger->rk808->regmap, RK817_GAS_GAUGE_DATA3,
233 				bulk_reg, 3);
234 	if (ret < 0)
235 		return ret;
236 
237 	return 0;
238 }
239 
240 static int rk817_bat_calib_cap(struct rk817_charger *charger)
241 {
242 	struct rk808 *rk808 = charger->rk808;
243 	int tmp, charge_now, charge_now_adc, volt_avg;
244 	u8 bulk_reg[4];
245 
246 	/* Calibrate the soc and fcc on a fully charged battery */
247 
248 	if (charger->charge_status == CHARGE_FINISH && (!charger->soc_cal)) {
249 		/*
250 		 * soc should be 100000 and columb counter should show the full
251 		 * charge capacity. Note that if the device is unplugged for a
252 		 * period of several days the columb counter will have a large
253 		 * margin of error, so setting it back to the full charge on
254 		 * a completed charge cycle should correct this (my device was
255 		 * showing 33% battery after 3 days unplugged when it should
256 		 * have been closer to 95% based on voltage and charge
257 		 * current).
258 		 */
259 
260 		charger->soc = 100000;
261 		charge_now_adc = CHARGE_TO_ADC(charger->fcc_mah,
262 					       charger->res_div);
263 		put_unaligned_be32(charge_now_adc, bulk_reg);
264 		regmap_bulk_write(rk808->regmap, RK817_GAS_GAUGE_Q_INIT_H3,
265 				  bulk_reg, 4);
266 
267 		charger->soc_cal = 1;
268 		dev_dbg(charger->dev,
269 			"Fully charged. SOC is %d, full capacity is %d\n",
270 			charger->soc, charger->fcc_mah * 1000);
271 	}
272 
273 	/*
274 	 * The columb counter can drift up slightly, so we should correct for
275 	 * it. But don't correct it until we're at 100% soc.
276 	 */
277 	if (charger->charge_status == CHARGE_FINISH && charger->soc_cal) {
278 		regmap_bulk_read(rk808->regmap, RK817_GAS_GAUGE_Q_PRES_H3,
279 				 bulk_reg, 4);
280 		charge_now_adc = get_unaligned_be32(bulk_reg);
281 		if (charge_now_adc < 0)
282 			return charge_now_adc;
283 		charge_now = ADC_TO_CHARGE_UAH(charge_now_adc,
284 					       charger->res_div);
285 
286 		/*
287 		 * Re-init columb counter with updated values to correct drift.
288 		 */
289 		if (charge_now / 1000 > charger->fcc_mah) {
290 			dev_dbg(charger->dev,
291 				"Recalibrating columb counter to %d uah\n",
292 				charge_now);
293 			/*
294 			 * Order of operations matters here to ensure we keep
295 			 * enough precision until the last step to keep from
296 			 * making needless updates to columb counter.
297 			 */
298 			charge_now_adc = CHARGE_TO_ADC(charger->fcc_mah,
299 					 charger->res_div);
300 			put_unaligned_be32(charge_now_adc, bulk_reg);
301 			regmap_bulk_write(rk808->regmap,
302 					  RK817_GAS_GAUGE_Q_INIT_H3,
303 					  bulk_reg, 4);
304 		}
305 	}
306 
307 	/*
308 	 * Calibrate the fully charged capacity when we previously had a full
309 	 * battery (soc_cal = 1) and are now empty (at or below minimum design
310 	 * voltage). If our columb counter is still positive, subtract that
311 	 * from our fcc value to get a calibrated fcc, and if our columb
312 	 * counter is negative add that to our fcc (but not to exceed our
313 	 * design capacity).
314 	 */
315 	regmap_bulk_read(charger->rk808->regmap, RK817_GAS_GAUGE_BAT_VOL_H,
316 			 bulk_reg, 2);
317 	tmp = get_unaligned_be16(bulk_reg);
318 	volt_avg = (charger->voltage_k * tmp) + 1000 * charger->voltage_b;
319 	if (volt_avg <= charger->bat_voltage_min_design_uv &&
320 	    charger->soc_cal) {
321 		regmap_bulk_read(rk808->regmap, RK817_GAS_GAUGE_Q_PRES_H3,
322 				 bulk_reg, 4);
323 		charge_now_adc = get_unaligned_be32(bulk_reg);
324 		charge_now = ADC_TO_CHARGE_UAH(charge_now_adc,
325 					       charger->res_div);
326 		/*
327 		 * Note, if charge_now is negative this will add it (what we
328 		 * want) and if it's positive this will subtract (also what
329 		 * we want).
330 		 */
331 		charger->fcc_mah = charger->fcc_mah - (charge_now / 1000);
332 
333 		dev_dbg(charger->dev,
334 			"Recalibrating full charge capacity to %d uah\n",
335 			charger->fcc_mah * 1000);
336 	}
337 
338 	/*
339 	 * Set the SOC to 0 if we are below the minimum system voltage.
340 	 */
341 	if (volt_avg <= charger->bat_voltage_min_design_uv) {
342 		charger->soc = 0;
343 		charge_now_adc = CHARGE_TO_ADC(0, charger->res_div);
344 		put_unaligned_be32(charge_now_adc, bulk_reg);
345 		regmap_bulk_write(rk808->regmap,
346 				  RK817_GAS_GAUGE_Q_INIT_H3, bulk_reg, 4);
347 		dev_warn(charger->dev,
348 			 "Battery voltage %d below minimum voltage %d\n",
349 			 volt_avg, charger->bat_voltage_min_design_uv);
350 		}
351 
352 	rk817_record_battery_nvram_values(charger);
353 
354 	return 0;
355 }
356 
357 static void rk817_read_props(struct rk817_charger *charger)
358 {
359 	int tmp, reg;
360 	u8 bulk_reg[4];
361 
362 	/*
363 	 * Recalibrate voltage and current readings if we need to BSP does both
364 	 * on CUR_CALIB_UPD, ignoring VOL_CALIB_UPD. Curiously enough, both
365 	 * documentation and the BSP show that you perform an update if bit 7
366 	 * is 1, but you clear the status by writing a 1 to bit 7.
367 	 */
368 	regmap_read(charger->rk808->regmap, RK817_GAS_GAUGE_ADC_CONFIG1, &reg);
369 	if (reg & RK817_VOL_CUR_CALIB_UPD) {
370 		rk817_bat_calib_cur(charger);
371 		rk817_bat_calib_vol(charger);
372 		regmap_write_bits(charger->rk808->regmap,
373 				  RK817_GAS_GAUGE_ADC_CONFIG1,
374 				  RK817_VOL_CUR_CALIB_UPD,
375 				  RK817_VOL_CUR_CALIB_UPD);
376 	}
377 
378 	/* Update reported charge. */
379 	regmap_bulk_read(charger->rk808->regmap, RK817_GAS_GAUGE_Q_PRES_H3,
380 			 bulk_reg, 4);
381 	tmp = get_unaligned_be32(bulk_reg);
382 	charger->charge_now_uah = ADC_TO_CHARGE_UAH(tmp, charger->res_div);
383 	if (charger->charge_now_uah < 0)
384 		charger->charge_now_uah = 0;
385 	if (charger->charge_now_uah > charger->fcc_mah * 1000)
386 		charger->charge_now_uah = charger->fcc_mah * 1000;
387 
388 	/* Update soc based on reported charge. */
389 	charger->soc = charger->charge_now_uah * 100 / charger->fcc_mah;
390 
391 	/* Update reported voltage. */
392 	regmap_bulk_read(charger->rk808->regmap, RK817_GAS_GAUGE_BAT_VOL_H,
393 			 bulk_reg, 2);
394 	tmp = get_unaligned_be16(bulk_reg);
395 	charger->volt_avg_uv = (charger->voltage_k * tmp) + 1000 *
396 				charger->voltage_b;
397 
398 	/*
399 	 * Update reported current. Note value from registers is a signed 16
400 	 * bit int.
401 	 */
402 	regmap_bulk_read(charger->rk808->regmap, RK817_GAS_GAUGE_BAT_CUR_H,
403 			 bulk_reg, 2);
404 	tmp = (short int)get_unaligned_be16(bulk_reg);
405 	charger->cur_avg_ua = ADC_TO_CURRENT(tmp, charger->res_div);
406 
407 	/*
408 	 * Update the max charge current. This value shouldn't change, but we
409 	 * can read it to report what the PMIC says it is instead of simply
410 	 * returning the default value.
411 	 */
412 	regmap_read(charger->rk808->regmap, RK817_PMIC_CHRG_OUT, &reg);
413 	charger->max_chg_cur_ua =
414 		rk817_chg_cur_from_reg(reg & RK817_CHRG_CUR_SEL);
415 
416 	/*
417 	 * Update max charge voltage. Like the max charge current this value
418 	 * shouldn't change, but we can report what the PMIC says.
419 	 */
420 	regmap_read(charger->rk808->regmap, RK817_PMIC_CHRG_OUT, &reg);
421 	charger->max_chg_volt_uv = ((((reg & RK817_CHRG_VOL_SEL) >> 4) *
422 				    50000) + 4100000);
423 
424 	/* Check if battery still present. */
425 	regmap_read(charger->rk808->regmap, RK817_PMIC_CHRG_STS, &reg);
426 	charger->battery_present = (reg & RK817_BAT_EXS);
427 
428 	/* Get which type of charge we are using (if any). */
429 	regmap_read(charger->rk808->regmap, RK817_PMIC_CHRG_STS, &reg);
430 	charger->charge_status = (reg >> 4) & 0x07;
431 
432 	/*
433 	 * Get charger input voltage. Note that on my example hardware (an
434 	 * Odroid Go Advance) the voltage of the power connector is measured
435 	 * on the register labelled USB in the datasheet; I don't know if this
436 	 * is how it is designed or just a quirk of the implementation. I
437 	 * believe this will also measure the voltage of the USB output when in
438 	 * OTG mode, if that is the case we may need to change this in the
439 	 * future to return 0 if the power supply status is offline (I can't
440 	 * test this with my current implementation. Also, when the voltage
441 	 * should be zero sometimes the ADC still shows a single bit (which
442 	 * would register as 20000uv). When this happens set it to 0.
443 	 */
444 	regmap_bulk_read(charger->rk808->regmap, RK817_GAS_GAUGE_USB_VOL_H,
445 			 bulk_reg, 2);
446 	reg = get_unaligned_be16(bulk_reg);
447 	if (reg > 1) {
448 		tmp = ((charger->voltage_k * reg / 1000 + charger->voltage_b) *
449 		       60 / 46);
450 		charger->charger_input_volt_avg_uv = tmp * 1000;
451 	} else {
452 		charger->charger_input_volt_avg_uv = 0;
453 	}
454 
455 	/* Calibrate battery capacity and soc. */
456 	rk817_bat_calib_cap(charger);
457 }
458 
459 static int rk817_bat_get_prop(struct power_supply *ps,
460 		enum power_supply_property prop,
461 		union power_supply_propval *val)
462 {
463 	struct rk817_charger *charger = power_supply_get_drvdata(ps);
464 
465 	switch (prop) {
466 	case POWER_SUPPLY_PROP_PRESENT:
467 		val->intval = charger->battery_present;
468 		break;
469 	case POWER_SUPPLY_PROP_STATUS:
470 		if (charger->cur_avg_ua < 0) {
471 			val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
472 			break;
473 		}
474 		switch (charger->charge_status) {
475 		case CHRG_OFF:
476 			val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
477 			break;
478 		/*
479 		 * Dead charge is documented, but not explained. I never
480 		 * observed it but assume it's a pre-charge for a dead
481 		 * battery.
482 		 */
483 		case DEAD_CHRG:
484 		case TRICKLE_CHRG:
485 		case CC_OR_CV_CHRG:
486 			val->intval = POWER_SUPPLY_STATUS_CHARGING;
487 			break;
488 		case CHARGE_FINISH:
489 			val->intval = POWER_SUPPLY_STATUS_FULL;
490 			break;
491 		default:
492 			val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
493 			return -EINVAL;
494 
495 		}
496 		break;
497 	case POWER_SUPPLY_PROP_CHARGE_TYPE:
498 		switch (charger->charge_status) {
499 		case CHRG_OFF:
500 		case CHARGE_FINISH:
501 			val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
502 			break;
503 		case TRICKLE_CHRG:
504 			val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
505 			break;
506 		case DEAD_CHRG:
507 		case CC_OR_CV_CHRG:
508 			val->intval = POWER_SUPPLY_CHARGE_TYPE_STANDARD;
509 			break;
510 		default:
511 			val->intval = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
512 			break;
513 		}
514 		break;
515 	case POWER_SUPPLY_PROP_CHARGE_FULL:
516 		val->intval = charger->fcc_mah * 1000;
517 		break;
518 	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
519 		val->intval = charger->bat_charge_full_design_uah;
520 		break;
521 	case POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN:
522 		val->intval = 0;
523 		break;
524 	case POWER_SUPPLY_PROP_CHARGE_NOW:
525 		val->intval = charger->charge_now_uah;
526 		break;
527 	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
528 		val->intval = charger->bat_voltage_min_design_uv;
529 		break;
530 	case POWER_SUPPLY_PROP_CAPACITY:
531 		/* Add 500 so that values like 99999 are 100% not 99%. */
532 		val->intval = (charger->soc + 500) / 1000;
533 		if (val->intval > 100)
534 			val->intval = 100;
535 		if (val->intval < 0)
536 			val->intval = 0;
537 		break;
538 	case POWER_SUPPLY_PROP_VOLTAGE_AVG:
539 		val->intval = charger->volt_avg_uv;
540 		break;
541 	case POWER_SUPPLY_PROP_CURRENT_AVG:
542 		val->intval = charger->cur_avg_ua;
543 		break;
544 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
545 		val->intval = charger->max_chg_cur_ua;
546 		break;
547 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
548 		val->intval = charger->max_chg_volt_uv;
549 		break;
550 	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
551 		val->intval = charger->bat_voltage_max_design_uv;
552 		break;
553 	default:
554 		return -EINVAL;
555 	}
556 	return 0;
557 }
558 
559 static int rk817_chg_get_prop(struct power_supply *ps,
560 			      enum power_supply_property prop,
561 			      union power_supply_propval *val)
562 {
563 	struct rk817_charger *charger = power_supply_get_drvdata(ps);
564 
565 	switch (prop) {
566 	case POWER_SUPPLY_PROP_ONLINE:
567 		val->intval = charger->plugged_in;
568 		break;
569 	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
570 		/* max voltage from datasheet at 5.5v (default 5.0v) */
571 		val->intval = 5500000;
572 		break;
573 	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
574 		/* min voltage from datasheet at 3.8v (default 5.0v) */
575 		val->intval = 3800000;
576 		break;
577 	case POWER_SUPPLY_PROP_VOLTAGE_AVG:
578 		val->intval = charger->charger_input_volt_avg_uv;
579 		break;
580 	/*
581 	 * While it's possible that other implementations could use different
582 	 * USB types, the current implementation for this PMIC (the Odroid Go
583 	 * Advance) only uses a dedicated charging port with no rx/tx lines.
584 	 */
585 	case POWER_SUPPLY_PROP_USB_TYPE:
586 		val->intval = POWER_SUPPLY_USB_TYPE_DCP;
587 		break;
588 	default:
589 		return -EINVAL;
590 	}
591 	return 0;
592 
593 }
594 
595 static irqreturn_t rk817_plug_in_isr(int irq, void *cg)
596 {
597 	struct rk817_charger *charger;
598 
599 	charger = (struct rk817_charger *)cg;
600 	charger->plugged_in = 1;
601 	power_supply_changed(charger->chg_ps);
602 	power_supply_changed(charger->bat_ps);
603 	/* try to recalibrate capacity if we hit full charge. */
604 	charger->soc_cal = 0;
605 
606 	rk817_read_props(charger);
607 
608 	dev_dbg(charger->dev, "Power Cord Inserted\n");
609 
610 	return IRQ_HANDLED;
611 }
612 
613 static irqreturn_t rk817_plug_out_isr(int irq, void *cg)
614 {
615 	struct rk817_charger *charger;
616 	struct rk808 *rk808;
617 
618 	charger = (struct rk817_charger *)cg;
619 	rk808 = charger->rk808;
620 	charger->plugged_in = 0;
621 	power_supply_changed(charger->bat_ps);
622 	power_supply_changed(charger->chg_ps);
623 
624 	/*
625 	 * For some reason the bits of RK817_PMIC_CHRG_IN reset whenever the
626 	 * power cord is unplugged. This was not documented in the BSP kernel
627 	 * or the datasheet and only discovered by trial and error. Set minimum
628 	 * USB input voltage to 4.5v and enable USB voltage input limit.
629 	 */
630 	regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_IN,
631 			  RK817_USB_VLIM_SEL, (0x05 << 4));
632 	regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_IN, RK817_USB_VLIM_EN,
633 			  (0x01 << 7));
634 
635 	/*
636 	 * Set average USB input current limit to 1.5A and enable USB current
637 	 * input limit.
638 	 */
639 	regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_IN,
640 			  RK817_USB_ILIM_SEL, 0x03);
641 	regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_IN, RK817_USB_ILIM_EN,
642 			  (0x01 << 3));
643 
644 	rk817_read_props(charger);
645 
646 	dev_dbg(charger->dev, "Power Cord Removed\n");
647 
648 	return IRQ_HANDLED;
649 }
650 
651 static enum power_supply_property rk817_bat_props[] = {
652 	POWER_SUPPLY_PROP_PRESENT,
653 	POWER_SUPPLY_PROP_STATUS,
654 	POWER_SUPPLY_PROP_CHARGE_TYPE,
655 	POWER_SUPPLY_PROP_CHARGE_FULL,
656 	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
657 	POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN,
658 	POWER_SUPPLY_PROP_CHARGE_NOW,
659 	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
660 	POWER_SUPPLY_PROP_VOLTAGE_AVG,
661 	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
662 	POWER_SUPPLY_PROP_CURRENT_AVG,
663 	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
664 	POWER_SUPPLY_PROP_CAPACITY,
665 	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
666 };
667 
668 static enum power_supply_property rk817_chg_props[] = {
669 	POWER_SUPPLY_PROP_ONLINE,
670 	POWER_SUPPLY_PROP_USB_TYPE,
671 	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
672 	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
673 	POWER_SUPPLY_PROP_VOLTAGE_AVG,
674 };
675 
676 static enum power_supply_usb_type rk817_usb_type[] = {
677 	POWER_SUPPLY_USB_TYPE_DCP,
678 	POWER_SUPPLY_USB_TYPE_UNKNOWN,
679 };
680 
681 static const struct power_supply_desc rk817_bat_desc = {
682 	.name = "rk817-battery",
683 	.type = POWER_SUPPLY_TYPE_BATTERY,
684 	.properties = rk817_bat_props,
685 	.num_properties = ARRAY_SIZE(rk817_bat_props),
686 	.get_property = rk817_bat_get_prop,
687 };
688 
689 static const struct power_supply_desc rk817_chg_desc = {
690 	.name = "rk817-charger",
691 	.type = POWER_SUPPLY_TYPE_USB,
692 	.usb_types = rk817_usb_type,
693 	.num_usb_types = ARRAY_SIZE(rk817_usb_type),
694 	.properties = rk817_chg_props,
695 	.num_properties = ARRAY_SIZE(rk817_chg_props),
696 	.get_property = rk817_chg_get_prop,
697 };
698 
699 static int rk817_read_battery_nvram_values(struct rk817_charger *charger)
700 {
701 	u8 bulk_reg[3];
702 	int ret;
703 
704 	/* Read the nvram data for full charge capacity. */
705 	ret = regmap_bulk_read(charger->rk808->regmap,
706 			       RK817_GAS_GAUGE_DATA3, bulk_reg, 3);
707 	if (ret < 0)
708 		return ret;
709 	charger->fcc_mah = get_unaligned_le24(bulk_reg);
710 
711 	/*
712 	 * Sanity checking for values equal to zero or less than would be
713 	 * practical for this device (BSP Kernel assumes 500mAH or less) for
714 	 * practicality purposes. Also check if the value is too large and
715 	 * correct it.
716 	 */
717 	if ((charger->fcc_mah < 500) ||
718 	   ((charger->fcc_mah * 1000) > charger->bat_charge_full_design_uah)) {
719 		dev_info(charger->dev,
720 			 "Invalid NVRAM max charge, setting to %u uAH\n",
721 			 charger->bat_charge_full_design_uah);
722 		charger->fcc_mah = charger->bat_charge_full_design_uah / 1000;
723 	}
724 
725 	/*
726 	 * Read the nvram for state of charge. Sanity check for values greater
727 	 * than 100 (10000) or less than 0, because other things (BSP kernels,
728 	 * U-Boot, or even i2cset) can write to this register. If the value is
729 	 * off it should get corrected automatically when the voltage drops to
730 	 * the min (soc is 0) or when the battery is full (soc is 100).
731 	 */
732 	ret = regmap_bulk_read(charger->rk808->regmap,
733 			       RK817_GAS_GAUGE_BAT_R1, bulk_reg, 3);
734 	if (ret < 0)
735 		return ret;
736 	charger->soc = get_unaligned_le24(bulk_reg);
737 	if (charger->soc > 10000)
738 		charger->soc = 10000;
739 	if (charger->soc < 0)
740 		charger->soc = 0;
741 
742 	return 0;
743 }
744 
745 static int
746 rk817_read_or_set_full_charge_on_boot(struct rk817_charger *charger,
747 				struct power_supply_battery_info *bat_info)
748 {
749 	struct rk808 *rk808 = charger->rk808;
750 	u8 bulk_reg[4];
751 	u32 boot_voltage, boot_charge_mah;
752 	int ret, reg, off_time, tmp;
753 	bool first_boot;
754 
755 	/*
756 	 * Check if the battery is uninitalized. If it is, the columb counter
757 	 * needs to be set up.
758 	 */
759 	ret = regmap_read(rk808->regmap, RK817_GAS_GAUGE_GG_STS, &reg);
760 	if (ret < 0)
761 		return ret;
762 	first_boot = reg & RK817_BAT_CON;
763 	/*
764 	 * If the battery is uninitialized, use the poweron voltage and an ocv
765 	 * lookup to guess our charge. The number won't be very accurate until
766 	 * we hit either our minimum voltage (0%) or full charge (100%).
767 	 */
768 	if (first_boot) {
769 		regmap_bulk_read(rk808->regmap, RK817_GAS_GAUGE_PWRON_VOL_H,
770 				 bulk_reg, 2);
771 		tmp = get_unaligned_be16(bulk_reg);
772 		boot_voltage = (charger->voltage_k * tmp) +
773 				1000 * charger->voltage_b;
774 		/*
775 		 * Since only implementation has no working thermistor, assume
776 		 * 20C for OCV lookup. If lookup fails, report error with OCV
777 		 * table.
778 		 */
779 		charger->soc = power_supply_batinfo_ocv2cap(bat_info,
780 							    boot_voltage,
781 							    20) * 1000;
782 		if (charger->soc < 0)
783 			charger->soc = 0;
784 
785 		/* Guess that full charge capacity is the design capacity */
786 		charger->fcc_mah = charger->bat_charge_full_design_uah / 1000;
787 		/*
788 		 * Set battery as "set up". BSP driver uses this value even
789 		 * though datasheet claims it's a read-only value.
790 		 */
791 		regmap_write_bits(rk808->regmap, RK817_GAS_GAUGE_GG_STS,
792 				  RK817_BAT_CON, 0);
793 		/* Save nvram values */
794 		ret = rk817_record_battery_nvram_values(charger);
795 		if (ret < 0)
796 			return ret;
797 	} else {
798 		ret = rk817_read_battery_nvram_values(charger);
799 		if (ret < 0)
800 			return ret;
801 
802 		regmap_bulk_read(rk808->regmap, RK817_GAS_GAUGE_Q_PRES_H3,
803 				 bulk_reg, 4);
804 		tmp = get_unaligned_be32(bulk_reg);
805 		if (tmp < 0)
806 			tmp = 0;
807 		boot_charge_mah = ADC_TO_CHARGE_UAH(tmp,
808 						    charger->res_div) / 1000;
809 		/*
810 		 * Check if the columb counter has been off for more than 30
811 		 * minutes as it tends to drift downward. If so, re-init soc
812 		 * with the boot voltage instead. Note the unit values for the
813 		 * OFF_CNT register appear to be in decaminutes and stops
814 		 * counting at 2550 (0xFF) minutes. BSP kernel used OCV, but
815 		 * for me occasionally that would show invalid values. Boot
816 		 * voltage is only accurate for me on first poweron (not
817 		 * reboots), but we shouldn't ever encounter an OFF_CNT more
818 		 * than 0 on a reboot anyway.
819 		 */
820 		regmap_read(rk808->regmap, RK817_GAS_GAUGE_OFF_CNT, &off_time);
821 		if (off_time >= 3) {
822 			regmap_bulk_read(rk808->regmap,
823 					 RK817_GAS_GAUGE_PWRON_VOL_H,
824 					 bulk_reg, 2);
825 			tmp = get_unaligned_be16(bulk_reg);
826 			boot_voltage = (charger->voltage_k * tmp) +
827 					1000 * charger->voltage_b;
828 			charger->soc =
829 				power_supply_batinfo_ocv2cap(bat_info,
830 							     boot_voltage,
831 							     20) * 1000;
832 		} else {
833 			charger->soc = (boot_charge_mah * 1000 * 100 /
834 					charger->fcc_mah);
835 		}
836 	}
837 
838 	/*
839 	 * Now we have our full charge capacity and soc, init the columb
840 	 * counter.
841 	 */
842 	boot_charge_mah = charger->soc * charger->fcc_mah / 100 / 1000;
843 	if (boot_charge_mah > charger->fcc_mah)
844 		boot_charge_mah = charger->fcc_mah;
845 	tmp = CHARGE_TO_ADC(boot_charge_mah, charger->res_div);
846 	put_unaligned_be32(tmp, bulk_reg);
847 	ret = regmap_bulk_write(rk808->regmap, RK817_GAS_GAUGE_Q_INIT_H3,
848 			  bulk_reg, 4);
849 	if (ret < 0)
850 		return ret;
851 
852 	/* Set QMAX value to max design capacity. */
853 	tmp = CHARGE_TO_ADC((charger->bat_charge_full_design_uah / 1000),
854 			    charger->res_div);
855 	put_unaligned_be32(tmp, bulk_reg);
856 	ret = regmap_bulk_write(rk808->regmap, RK817_GAS_GAUGE_Q_MAX_H3,
857 				bulk_reg, 4);
858 	if (ret < 0)
859 		return ret;
860 
861 	return 0;
862 }
863 
864 static int rk817_battery_init(struct rk817_charger *charger,
865 			      struct power_supply_battery_info *bat_info)
866 {
867 	struct rk808 *rk808 = charger->rk808;
868 	u32 tmp, max_chg_vol_mv, max_chg_cur_ma;
869 	u8 max_chg_vol_reg, chg_term_i_reg;
870 	int ret, chg_term_ma, max_chg_cur_reg;
871 	u8 bulk_reg[2];
872 
873 	/* Get initial plug state */
874 	regmap_read(rk808->regmap, RK817_SYS_STS, &tmp);
875 	charger->plugged_in = (tmp & RK817_PLUG_IN_STS);
876 
877 	/*
878 	 * Turn on all ADC functions to measure battery, USB, and sys voltage,
879 	 * as well as batt temp. Note only tested implementation so far does
880 	 * not use a battery with a thermistor.
881 	 */
882 	regmap_write(rk808->regmap, RK817_GAS_GAUGE_ADC_CONFIG0, 0xfc);
883 
884 	/*
885 	 * Set relax mode voltage sampling interval and ADC offset calibration
886 	 * interval to 8 minutes to mirror BSP kernel. Set voltage and current
887 	 * modes to average to mirror BSP kernel.
888 	 */
889 	regmap_write(rk808->regmap, RK817_GAS_GAUGE_GG_CON, 0x04);
890 
891 	/* Calibrate voltage like the BSP does here. */
892 	rk817_bat_calib_vol(charger);
893 
894 	/* Write relax threshold, derived from sleep enter current. */
895 	tmp = CURRENT_TO_ADC(charger->sleep_enter_current_ua,
896 			     charger->res_div);
897 	put_unaligned_be16(tmp, bulk_reg);
898 	regmap_bulk_write(rk808->regmap, RK817_GAS_GAUGE_RELAX_THRE_H,
899 			  bulk_reg, 2);
900 
901 	/* Write sleep sample current, derived from sleep filter current. */
902 	tmp = CURRENT_TO_ADC(charger->sleep_filter_current_ua,
903 			     charger->res_div);
904 	put_unaligned_be16(tmp, bulk_reg);
905 	regmap_bulk_write(rk808->regmap, RK817_GAS_GAUGE_SLEEP_CON_SAMP_CUR_H,
906 			  bulk_reg, 2);
907 
908 	/* Restart battery relax voltage */
909 	regmap_write_bits(rk808->regmap, RK817_GAS_GAUGE_GG_STS,
910 			  RK817_RELAX_VOL_UPD, (0x0 << 2));
911 
912 	/*
913 	 * Set OCV Threshold Voltage to 127.5mV. This was hard coded like this
914 	 * in the BSP.
915 	 */
916 	regmap_write(rk808->regmap, RK817_GAS_GAUGE_OCV_THRE_VOL, 0xff);
917 
918 	/*
919 	 * Set maximum charging voltage to battery max voltage. Trying to be
920 	 * incredibly safe with these value, as setting them wrong could
921 	 * overcharge the battery, which would be very bad.
922 	 */
923 	max_chg_vol_mv = bat_info->constant_charge_voltage_max_uv / 1000;
924 	max_chg_cur_ma = bat_info->constant_charge_current_max_ua / 1000;
925 
926 	if (max_chg_vol_mv < 4100) {
927 		return dev_err_probe(charger->dev, -EINVAL,
928 		       "invalid max charger voltage, value %u unsupported\n",
929 			max_chg_vol_mv * 1000);
930 	}
931 	if (max_chg_vol_mv > 4450) {
932 		dev_info(charger->dev,
933 			 "Setting max charge voltage to 4450000uv\n");
934 		max_chg_vol_mv = 4450;
935 	}
936 
937 	if (max_chg_cur_ma < 500) {
938 		return dev_err_probe(charger->dev, -EINVAL,
939 		       "invalid max charger current, value %u unsupported\n",
940 		       max_chg_cur_ma * 1000);
941 	}
942 	if (max_chg_cur_ma > 3500)
943 		dev_info(charger->dev,
944 			 "Setting max charge current to 3500000ua\n");
945 
946 	/*
947 	 * Now that the values are sanity checked, if we subtract 4100 from the
948 	 * max voltage and divide by 50, we conviently get the exact value for
949 	 * the registers, which are 4.1v, 4.15v, 4.2v, 4.25v, 4.3v, 4.35v,
950 	 * 4.4v, and 4.45v; these correspond to values 0x00 through 0x07.
951 	 */
952 	max_chg_vol_reg = (max_chg_vol_mv - 4100) / 50;
953 
954 	max_chg_cur_reg = rk817_chg_cur_to_reg(max_chg_cur_ma);
955 
956 	if (max_chg_vol_reg < 0 || max_chg_vol_reg > 7) {
957 		return dev_err_probe(charger->dev, -EINVAL,
958 		       "invalid max charger voltage, value %u unsupported\n",
959 		       max_chg_vol_mv * 1000);
960 	}
961 	if (max_chg_cur_reg < 0 || max_chg_cur_reg > 7) {
962 		return dev_err_probe(charger->dev, -EINVAL,
963 		       "invalid max charger current, value %u unsupported\n",
964 		       max_chg_cur_ma * 1000);
965 	}
966 
967 	/*
968 	 * Write the values to the registers, and deliver an emergency warning
969 	 * in the event they are not written correctly.
970 	 */
971 	ret = regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_OUT,
972 				RK817_CHRG_VOL_SEL, (max_chg_vol_reg << 4));
973 	if (ret) {
974 		dev_emerg(charger->dev,
975 			  "Danger, unable to set max charger voltage: %u\n",
976 			  ret);
977 	}
978 
979 	ret = regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_OUT,
980 				RK817_CHRG_CUR_SEL, max_chg_cur_reg);
981 	if (ret) {
982 		dev_emerg(charger->dev,
983 			  "Danger, unable to set max charger current: %u\n",
984 			  ret);
985 	}
986 
987 	/* Set charge finishing mode to analog */
988 	regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_TERM,
989 			  RK817_CHRG_TERM_ANA_DIG, (0x0 << 2));
990 
991 	/*
992 	 * Set charge finish current, warn if value not in range and keep
993 	 * default.
994 	 */
995 	chg_term_ma = bat_info->charge_term_current_ua / 1000;
996 	if (chg_term_ma < 150 || chg_term_ma > 400) {
997 		dev_warn(charger->dev,
998 			 "Invalid charge termination %u, keeping default\n",
999 			 chg_term_ma * 1000);
1000 		chg_term_ma = 200;
1001 	}
1002 
1003 	/*
1004 	 * Values of 150ma, 200ma, 300ma, and 400ma correspond to 00, 01, 10,
1005 	 * and 11.
1006 	 */
1007 	chg_term_i_reg = (chg_term_ma - 100) / 100;
1008 	regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_TERM,
1009 			  RK817_CHRG_TERM_ANA_SEL, chg_term_i_reg);
1010 
1011 	ret = rk817_read_or_set_full_charge_on_boot(charger, bat_info);
1012 	if (ret < 0)
1013 		return ret;
1014 
1015 	/*
1016 	 * Set minimum USB input voltage to 4.5v and enable USB voltage input
1017 	 * limit.
1018 	 */
1019 	regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_IN,
1020 			  RK817_USB_VLIM_SEL, (0x05 << 4));
1021 	regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_IN, RK817_USB_VLIM_EN,
1022 			  (0x01 << 7));
1023 
1024 	/*
1025 	 * Set average USB input current limit to 1.5A and enable USB current
1026 	 * input limit.
1027 	 */
1028 	regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_IN,
1029 			  RK817_USB_ILIM_SEL, 0x03);
1030 	regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_IN, RK817_USB_ILIM_EN,
1031 			  (0x01 << 3));
1032 
1033 	return 0;
1034 }
1035 
1036 static void rk817_charging_monitor(struct work_struct *work)
1037 {
1038 	struct rk817_charger *charger;
1039 
1040 	charger = container_of(work, struct rk817_charger, work.work);
1041 
1042 	rk817_read_props(charger);
1043 
1044 	/* Run every 8 seconds like the BSP driver did. */
1045 	queue_delayed_work(system_wq, &charger->work, msecs_to_jiffies(8000));
1046 }
1047 
1048 static int rk817_charger_probe(struct platform_device *pdev)
1049 {
1050 	struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
1051 	struct rk817_charger *charger;
1052 	struct device_node *node;
1053 	struct power_supply_battery_info *bat_info;
1054 	struct device *dev = &pdev->dev;
1055 	struct power_supply_config pscfg = {};
1056 	int plugin_irq, plugout_irq;
1057 	int of_value;
1058 	int ret;
1059 
1060 	node = of_get_child_by_name(dev->parent->of_node, "charger");
1061 	if (!node)
1062 		return -ENODEV;
1063 
1064 	charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
1065 	if (!charger) {
1066 		of_node_put(node);
1067 		return -ENOMEM;
1068 	}
1069 
1070 	charger->rk808 = rk808;
1071 
1072 	charger->dev = &pdev->dev;
1073 	platform_set_drvdata(pdev, charger);
1074 
1075 	rk817_bat_calib_vol(charger);
1076 
1077 	pscfg.drv_data = charger;
1078 	pscfg.of_node = node;
1079 
1080 	/*
1081 	 * Get sample resistor value. Note only values of 10000 or 20000
1082 	 * microohms are allowed. Schematic for my test implementation (an
1083 	 * Odroid Go Advance) shows a 10 milliohm resistor for reference.
1084 	 */
1085 	ret = of_property_read_u32(node, "rockchip,resistor-sense-micro-ohms",
1086 				   &of_value);
1087 	if (ret < 0) {
1088 		return dev_err_probe(dev, ret,
1089 				     "Error reading sample resistor value\n");
1090 	}
1091 	/*
1092 	 * Store as a 1 or a 2, since all we really use the value for is as a
1093 	 * divisor in some calculations.
1094 	 */
1095 	charger->res_div = (of_value == 20000) ? 2 : 1;
1096 
1097 	/*
1098 	 * Get sleep enter current value. Not sure what this value is for
1099 	 * other than to help calibrate the relax threshold.
1100 	 */
1101 	ret = of_property_read_u32(node,
1102 				   "rockchip,sleep-enter-current-microamp",
1103 				   &of_value);
1104 	if (ret < 0) {
1105 		return dev_err_probe(dev, ret,
1106 				     "Error reading sleep enter cur value\n");
1107 	}
1108 	charger->sleep_enter_current_ua = of_value;
1109 
1110 	/* Get sleep filter current value */
1111 	ret = of_property_read_u32(node,
1112 				   "rockchip,sleep-filter-current-microamp",
1113 				   &of_value);
1114 	if (ret < 0) {
1115 		return dev_err_probe(dev, ret,
1116 				     "Error reading sleep filter cur value\n");
1117 	}
1118 
1119 	charger->sleep_filter_current_ua = of_value;
1120 
1121 	charger->bat_ps = devm_power_supply_register(&pdev->dev,
1122 						     &rk817_bat_desc, &pscfg);
1123 	if (IS_ERR(charger->bat_ps))
1124 		return dev_err_probe(dev, -EINVAL,
1125 				     "Battery failed to probe\n");
1126 
1127 	charger->chg_ps = devm_power_supply_register(&pdev->dev,
1128 						     &rk817_chg_desc, &pscfg);
1129 	if (IS_ERR(charger->chg_ps))
1130 		return dev_err_probe(dev, -EINVAL,
1131 				     "Charger failed to probe\n");
1132 
1133 	ret = power_supply_get_battery_info(charger->bat_ps,
1134 					    &bat_info);
1135 	if (ret) {
1136 		return dev_err_probe(dev, ret,
1137 				     "Unable to get battery info: %d\n", ret);
1138 	}
1139 
1140 	if ((bat_info->charge_full_design_uah <= 0) ||
1141 	    (bat_info->voltage_min_design_uv <= 0) ||
1142 	    (bat_info->voltage_max_design_uv <= 0) ||
1143 	    (bat_info->constant_charge_voltage_max_uv <= 0) ||
1144 	    (bat_info->constant_charge_current_max_ua <= 0) ||
1145 	    (bat_info->charge_term_current_ua <= 0)) {
1146 		return dev_err_probe(dev, -EINVAL,
1147 				     "Required bat info missing or invalid\n");
1148 	}
1149 
1150 	charger->bat_charge_full_design_uah = bat_info->charge_full_design_uah;
1151 	charger->bat_voltage_min_design_uv = bat_info->voltage_min_design_uv;
1152 	charger->bat_voltage_max_design_uv = bat_info->voltage_max_design_uv;
1153 
1154 	/*
1155 	 * Has to run after power_supply_get_battery_info as it depends on some
1156 	 * values discovered from that routine.
1157 	 */
1158 	ret = rk817_battery_init(charger, bat_info);
1159 	if (ret)
1160 		return ret;
1161 
1162 	power_supply_put_battery_info(charger->bat_ps, bat_info);
1163 
1164 	plugin_irq = platform_get_irq(pdev, 0);
1165 	if (plugin_irq < 0)
1166 		return plugin_irq;
1167 
1168 	plugout_irq = platform_get_irq(pdev, 1);
1169 	if (plugout_irq < 0)
1170 		return plugout_irq;
1171 
1172 	ret = devm_request_threaded_irq(charger->dev, plugin_irq, NULL,
1173 					rk817_plug_in_isr,
1174 					IRQF_TRIGGER_RISING | IRQF_ONESHOT,
1175 					"rk817_plug_in", charger);
1176 	if (ret) {
1177 		return dev_err_probe(&pdev->dev, ret,
1178 				      "plug_in_irq request failed!\n");
1179 	}
1180 
1181 	ret = devm_request_threaded_irq(charger->dev, plugout_irq, NULL,
1182 					rk817_plug_out_isr,
1183 					IRQF_TRIGGER_RISING | IRQF_ONESHOT,
1184 					"rk817_plug_out", charger);
1185 	if (ret) {
1186 		return dev_err_probe(&pdev->dev, ret,
1187 				     "plug_out_irq request failed!\n");
1188 	}
1189 
1190 	ret = devm_delayed_work_autocancel(&pdev->dev, &charger->work,
1191 					   rk817_charging_monitor);
1192 	if (ret)
1193 		return ret;
1194 
1195 	/* Force the first update immediately. */
1196 	mod_delayed_work(system_wq, &charger->work, 0);
1197 
1198 	return 0;
1199 }
1200 
1201 
1202 static struct platform_driver rk817_charger_driver = {
1203 	.probe    = rk817_charger_probe,
1204 	.driver   = {
1205 		.name  = "rk817-charger",
1206 	},
1207 };
1208 module_platform_driver(rk817_charger_driver);
1209 
1210 MODULE_DESCRIPTION("Battery power supply driver for RK817 PMIC");
1211 MODULE_AUTHOR("Maya Matuszczyk <maccraft123mc@gmail.com>");
1212 MODULE_AUTHOR("Chris Morgan <macromorgan@hotmail.com>");
1213 MODULE_LICENSE("GPL");
1214