1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2022 Richtek Technology Corp.
4  *
5  * Author: ChiaEn Wu <chiaen_wu@richtek.com>
6  */
7 
8 #include <linux/bitfield.h>
9 #include <linux/bits.h>
10 #include <linux/devm-helpers.h>
11 #include <linux/gpio/consumer.h>
12 #include <linux/iio/consumer.h>
13 #include <linux/init.h>
14 #include <linux/interrupt.h>
15 #include <linux/kernel.h>
16 #include <linux/linear_range.h>
17 #include <linux/module.h>
18 #include <linux/of.h>
19 #include <linux/platform_device.h>
20 #include <linux/power_supply.h>
21 #include <linux/regmap.h>
22 #include <linux/regulator/driver.h>
23 #include <linux/workqueue.h>
24 
25 #define MT6370_REG_CHG_CTRL1		0x111
26 #define MT6370_REG_CHG_CTRL2		0x112
27 #define MT6370_REG_CHG_CTRL3		0x113
28 #define MT6370_REG_CHG_CTRL4		0x114
29 #define MT6370_REG_CHG_CTRL5		0x115
30 #define MT6370_REG_CHG_CTRL6		0x116
31 #define MT6370_REG_CHG_CTRL7		0x117
32 #define MT6370_REG_CHG_CTRL8		0x118
33 #define MT6370_REG_CHG_CTRL9		0x119
34 #define MT6370_REG_CHG_CTRL10		0x11A
35 #define MT6370_REG_DEVICE_TYPE		0x122
36 #define MT6370_REG_USB_STATUS1		0x127
37 #define MT6370_REG_CHG_STAT		0x14A
38 #define MT6370_REG_FLED_EN		0x17E
39 #define MT6370_REG_CHG_STAT1		0X1D0
40 #define MT6370_REG_OVPCTRL_STAT		0x1D8
41 
42 #define MT6370_VOBST_MASK		GENMASK(7, 2)
43 #define MT6370_OTG_PIN_EN_MASK		BIT(1)
44 #define MT6370_OPA_MODE_MASK		BIT(0)
45 #define MT6370_OTG_OC_MASK		GENMASK(2, 0)
46 
47 #define MT6370_MIVR_IBUS_TH_100_mA	100000
48 #define MT6370_ADC_CHAN_IBUS		5
49 #define MT6370_ADC_CHAN_MAX		9
50 
51 enum mt6370_chg_reg_field {
52 	/* MT6370_REG_CHG_CTRL2 */
53 	F_IINLMTSEL, F_CFO_EN, F_CHG_EN,
54 	/* MT6370_REG_CHG_CTRL3 */
55 	F_IAICR, F_AICR_EN, F_ILIM_EN,
56 	/* MT6370_REG_CHG_CTRL4 */
57 	F_VOREG,
58 	/* MT6370_REG_CHG_CTRL6 */
59 	F_VMIVR,
60 	/* MT6370_REG_CHG_CTRL7 */
61 	F_ICHG,
62 	/* MT6370_REG_CHG_CTRL8 */
63 	F_IPREC,
64 	/* MT6370_REG_CHG_CTRL9 */
65 	F_IEOC,
66 	/* MT6370_REG_DEVICE_TYPE */
67 	F_USBCHGEN,
68 	/* MT6370_REG_USB_STATUS1 */
69 	F_USB_STAT, F_CHGDET,
70 	/* MT6370_REG_CHG_STAT */
71 	F_CHG_STAT, F_BOOST_STAT, F_VBAT_LVL,
72 	/* MT6370_REG_FLED_EN */
73 	F_FL_STROBE,
74 	/* MT6370_REG_CHG_STAT1 */
75 	F_CHG_MIVR_STAT,
76 	/* MT6370_REG_OVPCTRL_STAT */
77 	F_UVP_D_STAT,
78 	F_MAX
79 };
80 
81 enum mt6370_irq {
82 	MT6370_IRQ_ATTACH_I = 0,
83 	MT6370_IRQ_UVP_D_EVT,
84 	MT6370_IRQ_MIVR,
85 	MT6370_IRQ_MAX
86 };
87 
88 struct mt6370_priv {
89 	struct device *dev;
90 	struct iio_channel *iio_adcs;
91 	struct mutex attach_lock;
92 	struct power_supply *psy;
93 	struct regmap *regmap;
94 	struct regmap_field *rmap_fields[F_MAX];
95 	struct regulator_dev *rdev;
96 	struct workqueue_struct *wq;
97 	struct work_struct bc12_work;
98 	struct delayed_work mivr_dwork;
99 	unsigned int irq_nums[MT6370_IRQ_MAX];
100 	int attach;
101 	int psy_usb_type;
102 	bool pwr_rdy;
103 };
104 
105 enum mt6370_usb_status {
106 	MT6370_USB_STAT_NO_VBUS = 0,
107 	MT6370_USB_STAT_VBUS_FLOW_IS_UNDER_GOING,
108 	MT6370_USB_STAT_SDP,
109 	MT6370_USB_STAT_SDP_NSTD,
110 	MT6370_USB_STAT_DCP,
111 	MT6370_USB_STAT_CDP,
112 	MT6370_USB_STAT_MAX
113 };
114 
115 struct mt6370_chg_field {
116 	const char *name;
117 	const struct linear_range *range;
118 	struct reg_field field;
119 };
120 
121 enum {
122 	MT6370_RANGE_F_IAICR = 0,
123 	MT6370_RANGE_F_VOREG,
124 	MT6370_RANGE_F_VMIVR,
125 	MT6370_RANGE_F_ICHG,
126 	MT6370_RANGE_F_IPREC,
127 	MT6370_RANGE_F_IEOC,
128 	MT6370_RANGE_F_MAX
129 };
130 
131 static const struct linear_range mt6370_chg_ranges[MT6370_RANGE_F_MAX] = {
132 	LINEAR_RANGE_IDX(MT6370_RANGE_F_IAICR, 100000, 0x0, 0x3F, 50000),
133 	LINEAR_RANGE_IDX(MT6370_RANGE_F_VOREG, 3900000, 0x0, 0x51, 10000),
134 	LINEAR_RANGE_IDX(MT6370_RANGE_F_VMIVR, 3900000, 0x0, 0x5F, 100000),
135 	LINEAR_RANGE_IDX(MT6370_RANGE_F_ICHG, 900000, 0x08, 0x31, 100000),
136 	LINEAR_RANGE_IDX(MT6370_RANGE_F_IPREC, 100000, 0x0, 0x0F, 50000),
137 	LINEAR_RANGE_IDX(MT6370_RANGE_F_IEOC, 100000, 0x0, 0x0F, 50000),
138 };
139 
140 #define MT6370_CHG_FIELD(_fd, _reg, _lsb, _msb)				\
141 [_fd] = {								\
142 	.name = #_fd,							\
143 	.range = NULL,							\
144 	.field = REG_FIELD(_reg, _lsb, _msb),				\
145 }
146 
147 #define MT6370_CHG_FIELD_RANGE(_fd, _reg, _lsb, _msb)			\
148 [_fd] = {								\
149 	.name = #_fd,							\
150 	.range = &mt6370_chg_ranges[MT6370_RANGE_##_fd],		\
151 	.field = REG_FIELD(_reg, _lsb, _msb),				\
152 }
153 
154 static const struct mt6370_chg_field mt6370_chg_fields[F_MAX] = {
155 	MT6370_CHG_FIELD(F_IINLMTSEL, MT6370_REG_CHG_CTRL2, 2, 3),
156 	MT6370_CHG_FIELD(F_CFO_EN, MT6370_REG_CHG_CTRL2, 1, 1),
157 	MT6370_CHG_FIELD(F_CHG_EN, MT6370_REG_CHG_CTRL2, 0, 0),
158 	MT6370_CHG_FIELD_RANGE(F_IAICR, MT6370_REG_CHG_CTRL3, 2, 7),
159 	MT6370_CHG_FIELD(F_AICR_EN, MT6370_REG_CHG_CTRL3, 1, 1),
160 	MT6370_CHG_FIELD(F_ILIM_EN, MT6370_REG_CHG_CTRL3, 0, 0),
161 	MT6370_CHG_FIELD_RANGE(F_VOREG, MT6370_REG_CHG_CTRL4, 1, 7),
162 	MT6370_CHG_FIELD_RANGE(F_VMIVR, MT6370_REG_CHG_CTRL6, 1, 7),
163 	MT6370_CHG_FIELD_RANGE(F_ICHG, MT6370_REG_CHG_CTRL7, 2, 7),
164 	MT6370_CHG_FIELD_RANGE(F_IPREC, MT6370_REG_CHG_CTRL8, 0, 3),
165 	MT6370_CHG_FIELD_RANGE(F_IEOC, MT6370_REG_CHG_CTRL9, 4, 7),
166 	MT6370_CHG_FIELD(F_USBCHGEN, MT6370_REG_DEVICE_TYPE, 7, 7),
167 	MT6370_CHG_FIELD(F_USB_STAT, MT6370_REG_USB_STATUS1, 4, 6),
168 	MT6370_CHG_FIELD(F_CHGDET, MT6370_REG_USB_STATUS1, 3, 3),
169 	MT6370_CHG_FIELD(F_CHG_STAT, MT6370_REG_CHG_STAT, 6, 7),
170 	MT6370_CHG_FIELD(F_BOOST_STAT, MT6370_REG_CHG_STAT, 3, 3),
171 	MT6370_CHG_FIELD(F_VBAT_LVL, MT6370_REG_CHG_STAT, 5, 5),
172 	MT6370_CHG_FIELD(F_FL_STROBE, MT6370_REG_FLED_EN, 2, 2),
173 	MT6370_CHG_FIELD(F_CHG_MIVR_STAT, MT6370_REG_CHG_STAT1, 6, 6),
174 	MT6370_CHG_FIELD(F_UVP_D_STAT, MT6370_REG_OVPCTRL_STAT, 4, 4),
175 };
176 
177 static inline int mt6370_chg_field_get(struct mt6370_priv *priv,
178 				       enum mt6370_chg_reg_field fd,
179 				       unsigned int *val)
180 {
181 	int ret;
182 	unsigned int reg_val;
183 
184 	ret = regmap_field_read(priv->rmap_fields[fd], &reg_val);
185 	if (ret)
186 		return ret;
187 
188 	if (mt6370_chg_fields[fd].range)
189 		return linear_range_get_value(mt6370_chg_fields[fd].range,
190 					       reg_val, val);
191 
192 	*val = reg_val;
193 	return 0;
194 }
195 
196 static inline int mt6370_chg_field_set(struct mt6370_priv *priv,
197 				       enum mt6370_chg_reg_field fd,
198 				       unsigned int val)
199 {
200 	int ret;
201 	bool f;
202 	const struct linear_range *r;
203 
204 	if (mt6370_chg_fields[fd].range) {
205 		r = mt6370_chg_fields[fd].range;
206 
207 		if (fd == F_VMIVR) {
208 			ret = linear_range_get_selector_high(r, val, &val, &f);
209 			if (ret)
210 				val = r->max_sel;
211 		} else {
212 			linear_range_get_selector_within(r, val, &val);
213 		}
214 	}
215 
216 	return regmap_field_write(priv->rmap_fields[fd], val);
217 }
218 
219 enum {
220 	MT6370_CHG_STAT_READY = 0,
221 	MT6370_CHG_STAT_CHARGE_IN_PROGRESS,
222 	MT6370_CHG_STAT_DONE,
223 	MT6370_CHG_STAT_FAULT,
224 	MT6370_CHG_STAT_MAX
225 };
226 
227 enum {
228 	MT6370_ATTACH_STAT_DETACH = 0,
229 	MT6370_ATTACH_STAT_ATTACH_WAIT_FOR_BC12,
230 	MT6370_ATTACH_STAT_ATTACH_BC12_DONE,
231 	MT6370_ATTACH_STAT_ATTACH_MAX
232 };
233 
234 static int mt6370_chg_otg_of_parse_cb(struct device_node *of,
235 				      const struct regulator_desc *rdesc,
236 				      struct regulator_config *rcfg)
237 {
238 	struct mt6370_priv *priv = rcfg->driver_data;
239 
240 	rcfg->ena_gpiod = fwnode_gpiod_get_index(of_fwnode_handle(of),
241 						 "enable", 0, GPIOD_OUT_LOW |
242 						 GPIOD_FLAGS_BIT_NONEXCLUSIVE,
243 						 rdesc->name);
244 	if (IS_ERR(rcfg->ena_gpiod)) {
245 		rcfg->ena_gpiod = NULL;
246 		return 0;
247 	}
248 
249 	return regmap_update_bits(priv->regmap, MT6370_REG_CHG_CTRL1,
250 				  MT6370_OTG_PIN_EN_MASK,
251 				  MT6370_OTG_PIN_EN_MASK);
252 }
253 
254 static void mt6370_chg_bc12_work_func(struct work_struct *work)
255 {
256 	struct mt6370_priv *priv = container_of(work, struct mt6370_priv,
257 						bc12_work);
258 	int ret;
259 	bool rpt_psy = false;
260 	unsigned int attach, usb_stat;
261 
262 	mutex_lock(&priv->attach_lock);
263 	attach = priv->attach;
264 
265 	switch (attach) {
266 	case MT6370_ATTACH_STAT_DETACH:
267 		usb_stat = 0;
268 		break;
269 	case MT6370_ATTACH_STAT_ATTACH_WAIT_FOR_BC12:
270 		ret = mt6370_chg_field_set(priv, F_USBCHGEN, attach);
271 		if (ret)
272 			dev_err(priv->dev, "Failed to enable USB CHG EN\n");
273 		goto bc12_work_func_out;
274 	case MT6370_ATTACH_STAT_ATTACH_BC12_DONE:
275 		ret = mt6370_chg_field_get(priv, F_USB_STAT, &usb_stat);
276 		if (ret) {
277 			dev_err(priv->dev, "Failed to get USB status\n");
278 			goto bc12_work_func_out;
279 		}
280 		break;
281 	default:
282 		dev_err(priv->dev, "Invalid attach state\n");
283 		goto bc12_work_func_out;
284 	}
285 
286 	rpt_psy = true;
287 
288 	switch (usb_stat) {
289 	case MT6370_USB_STAT_SDP:
290 	case MT6370_USB_STAT_SDP_NSTD:
291 		priv->psy_usb_type = POWER_SUPPLY_USB_TYPE_SDP;
292 		break;
293 	case MT6370_USB_STAT_DCP:
294 		priv->psy_usb_type = POWER_SUPPLY_USB_TYPE_DCP;
295 		break;
296 	case MT6370_USB_STAT_CDP:
297 		priv->psy_usb_type = POWER_SUPPLY_USB_TYPE_CDP;
298 		break;
299 	case MT6370_USB_STAT_NO_VBUS:
300 	case MT6370_USB_STAT_VBUS_FLOW_IS_UNDER_GOING:
301 	default:
302 		priv->psy_usb_type = POWER_SUPPLY_USB_TYPE_UNKNOWN;
303 		break;
304 	}
305 
306 bc12_work_func_out:
307 	mutex_unlock(&priv->attach_lock);
308 
309 	if (rpt_psy)
310 		power_supply_changed(priv->psy);
311 }
312 
313 static int mt6370_chg_toggle_cfo(struct mt6370_priv *priv)
314 {
315 	int ret;
316 	unsigned int fl_strobe;
317 
318 	/* check if flash led in strobe mode */
319 	ret = mt6370_chg_field_get(priv, F_FL_STROBE, &fl_strobe);
320 	if (ret) {
321 		dev_err(priv->dev, "Failed to get FL_STROBE_EN\n");
322 		return ret;
323 	}
324 
325 	if (fl_strobe) {
326 		dev_err(priv->dev, "Flash led is still in strobe mode\n");
327 		return ret;
328 	}
329 
330 	/* cfo off */
331 	ret = mt6370_chg_field_set(priv, F_CFO_EN, 0);
332 	if (ret) {
333 		dev_err(priv->dev, "Failed to disable CFO_EN\n");
334 		return ret;
335 	}
336 
337 	/* cfo on */
338 	ret = mt6370_chg_field_set(priv, F_CFO_EN, 1);
339 	if (ret)
340 		dev_err(priv->dev, "Failed to enable CFO_EN\n");
341 
342 	return ret;
343 }
344 
345 static int mt6370_chg_read_adc_chan(struct mt6370_priv *priv, unsigned int chan,
346 				    int *val)
347 {
348 	int ret;
349 
350 	if (chan >= MT6370_ADC_CHAN_MAX)
351 		return -EINVAL;
352 
353 	ret = iio_read_channel_processed(&priv->iio_adcs[chan], val);
354 	if (ret)
355 		dev_err(priv->dev, "Failed to read ADC\n");
356 
357 	return ret;
358 }
359 
360 static void mt6370_chg_mivr_dwork_func(struct work_struct *work)
361 {
362 	struct mt6370_priv *priv = container_of(work, struct mt6370_priv,
363 						mivr_dwork.work);
364 	int ret;
365 	unsigned int mivr_stat, ibus;
366 
367 	ret = mt6370_chg_field_get(priv, F_CHG_MIVR_STAT, &mivr_stat);
368 	if (ret) {
369 		dev_err(priv->dev, "Failed to get mivr state\n");
370 		goto mivr_handler_out;
371 	}
372 
373 	if (!mivr_stat)
374 		goto mivr_handler_out;
375 
376 	ret = mt6370_chg_read_adc_chan(priv, MT6370_ADC_CHAN_IBUS, &ibus);
377 	if (ret) {
378 		dev_err(priv->dev, "Failed to get ibus\n");
379 		goto mivr_handler_out;
380 	}
381 
382 	if (ibus < MT6370_MIVR_IBUS_TH_100_mA) {
383 		ret = mt6370_chg_toggle_cfo(priv);
384 		if (ret)
385 			dev_err(priv->dev, "Failed to toggle cfo\n");
386 	}
387 
388 mivr_handler_out:
389 	enable_irq(priv->irq_nums[MT6370_IRQ_MIVR]);
390 	pm_relax(priv->dev);
391 }
392 
393 static void mt6370_chg_pwr_rdy_check(struct mt6370_priv *priv)
394 {
395 	int ret;
396 	unsigned int opposite_pwr_rdy, otg_en;
397 	union power_supply_propval val;
398 
399 	/* Check in OTG mode or not */
400 	ret = mt6370_chg_field_get(priv, F_BOOST_STAT, &otg_en);
401 	if (ret) {
402 		dev_err(priv->dev, "Failed to get OTG state\n");
403 		return;
404 	}
405 
406 	if (otg_en)
407 		return;
408 
409 	ret = mt6370_chg_field_get(priv, F_UVP_D_STAT, &opposite_pwr_rdy);
410 	if (ret) {
411 		dev_err(priv->dev, "Failed to get opposite power ready state\n");
412 		return;
413 	}
414 
415 	val.intval = opposite_pwr_rdy ?
416 		     MT6370_ATTACH_STAT_DETACH :
417 		     MT6370_ATTACH_STAT_ATTACH_WAIT_FOR_BC12;
418 
419 	ret = power_supply_set_property(priv->psy, POWER_SUPPLY_PROP_ONLINE,
420 					&val);
421 	if (ret)
422 		dev_err(priv->dev, "Failed to start attach/detach flow\n");
423 }
424 
425 static int mt6370_chg_get_online(struct mt6370_priv *priv,
426 				 union power_supply_propval *val)
427 {
428 	mutex_lock(&priv->attach_lock);
429 	val->intval = !!priv->attach;
430 	mutex_unlock(&priv->attach_lock);
431 
432 	return 0;
433 }
434 
435 static int mt6370_chg_get_status(struct mt6370_priv *priv,
436 				 union power_supply_propval *val)
437 {
438 	int ret;
439 	unsigned int chg_stat;
440 	union power_supply_propval online;
441 
442 	ret = power_supply_get_property(priv->psy, POWER_SUPPLY_PROP_ONLINE,
443 					&online);
444 	if (ret) {
445 		dev_err(priv->dev, "Failed to get online status\n");
446 		return ret;
447 	}
448 
449 	if (!online.intval) {
450 		val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
451 		return 0;
452 	}
453 
454 	ret = mt6370_chg_field_get(priv, F_CHG_STAT, &chg_stat);
455 	if (ret)
456 		return ret;
457 
458 	switch (chg_stat) {
459 	case MT6370_CHG_STAT_READY:
460 	case MT6370_CHG_STAT_FAULT:
461 		val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
462 		return ret;
463 	case MT6370_CHG_STAT_CHARGE_IN_PROGRESS:
464 		val->intval = POWER_SUPPLY_STATUS_CHARGING;
465 		return ret;
466 	case MT6370_CHG_STAT_DONE:
467 		val->intval = POWER_SUPPLY_STATUS_FULL;
468 		return ret;
469 	default:
470 		val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
471 		return ret;
472 	}
473 }
474 
475 static int mt6370_chg_get_charge_type(struct mt6370_priv *priv,
476 				      union power_supply_propval *val)
477 {
478 	int type, ret;
479 	unsigned int chg_stat, vbat_lvl;
480 
481 	ret = mt6370_chg_field_get(priv, F_CHG_STAT, &chg_stat);
482 	if (ret)
483 		return ret;
484 
485 	ret = mt6370_chg_field_get(priv, F_VBAT_LVL, &vbat_lvl);
486 	if (ret)
487 		return ret;
488 
489 	switch (chg_stat) {
490 	case MT6370_CHG_STAT_CHARGE_IN_PROGRESS:
491 		if (vbat_lvl)
492 			type = POWER_SUPPLY_CHARGE_TYPE_FAST;
493 		else
494 			type = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
495 		break;
496 	case MT6370_CHG_STAT_READY:
497 	case MT6370_CHG_STAT_DONE:
498 	case MT6370_CHG_STAT_FAULT:
499 	default:
500 		type = POWER_SUPPLY_CHARGE_TYPE_NONE;
501 		break;
502 	}
503 
504 	val->intval = type;
505 
506 	return 0;
507 }
508 
509 static int mt6370_chg_set_online(struct mt6370_priv *priv,
510 				 const union power_supply_propval *val)
511 {
512 	bool pwr_rdy = !!val->intval;
513 
514 	mutex_lock(&priv->attach_lock);
515 	if (pwr_rdy == !!priv->attach) {
516 		dev_err(priv->dev, "pwr_rdy is same(%d)\n", pwr_rdy);
517 		mutex_unlock(&priv->attach_lock);
518 		return 0;
519 	}
520 
521 	priv->attach = pwr_rdy;
522 	mutex_unlock(&priv->attach_lock);
523 
524 	if (!queue_work(priv->wq, &priv->bc12_work))
525 		dev_err(priv->dev, "bc12 work has already queued\n");
526 
527 	return 0;
528 }
529 
530 static int mt6370_chg_get_property(struct power_supply *psy,
531 				   enum power_supply_property psp,
532 				   union power_supply_propval *val)
533 {
534 	struct mt6370_priv *priv = power_supply_get_drvdata(psy);
535 
536 	switch (psp) {
537 	case POWER_SUPPLY_PROP_ONLINE:
538 		return mt6370_chg_get_online(priv, val);
539 	case POWER_SUPPLY_PROP_STATUS:
540 		return mt6370_chg_get_status(priv, val);
541 	case POWER_SUPPLY_PROP_CHARGE_TYPE:
542 		return mt6370_chg_get_charge_type(priv, val);
543 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
544 		return mt6370_chg_field_get(priv, F_ICHG, &val->intval);
545 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
546 		val->intval = linear_range_get_max_value(&mt6370_chg_ranges[MT6370_RANGE_F_ICHG]);
547 		return 0;
548 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
549 		return mt6370_chg_field_get(priv, F_VOREG, &val->intval);
550 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
551 		val->intval = linear_range_get_max_value(&mt6370_chg_ranges[MT6370_RANGE_F_VOREG]);
552 		return 0;
553 	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
554 		return mt6370_chg_field_get(priv, F_IAICR, &val->intval);
555 	case POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT:
556 		return mt6370_chg_field_get(priv, F_VMIVR, &val->intval);
557 	case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
558 		return mt6370_chg_field_get(priv, F_IPREC, &val->intval);
559 	case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
560 		return mt6370_chg_field_get(priv, F_IEOC, &val->intval);
561 	case POWER_SUPPLY_PROP_USB_TYPE:
562 		val->intval = priv->psy_usb_type;
563 		return 0;
564 	default:
565 		return -EINVAL;
566 	}
567 }
568 
569 static int mt6370_chg_set_property(struct power_supply *psy,
570 				   enum power_supply_property psp,
571 				   const union power_supply_propval *val)
572 {
573 	struct mt6370_priv *priv = power_supply_get_drvdata(psy);
574 
575 	switch (psp) {
576 	case POWER_SUPPLY_PROP_ONLINE:
577 		return mt6370_chg_set_online(priv, val);
578 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
579 		return mt6370_chg_field_set(priv, F_ICHG, val->intval);
580 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
581 		return mt6370_chg_field_set(priv, F_VOREG, val->intval);
582 	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
583 		return mt6370_chg_field_set(priv, F_IAICR, val->intval);
584 	case POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT:
585 		return mt6370_chg_field_set(priv, F_VMIVR, val->intval);
586 	case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
587 		return mt6370_chg_field_set(priv, F_IPREC, val->intval);
588 	case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
589 		return mt6370_chg_field_set(priv, F_IEOC, val->intval);
590 	default:
591 		return -EINVAL;
592 	}
593 }
594 
595 static int mt6370_chg_property_is_writeable(struct power_supply *psy,
596 					    enum power_supply_property psp)
597 {
598 	switch (psp) {
599 	case POWER_SUPPLY_PROP_ONLINE:
600 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
601 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
602 	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
603 	case POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT:
604 	case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
605 	case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
606 		return 1;
607 	default:
608 		return 0;
609 	}
610 }
611 
612 static enum power_supply_property mt6370_chg_properties[] = {
613 	POWER_SUPPLY_PROP_ONLINE,
614 	POWER_SUPPLY_PROP_STATUS,
615 	POWER_SUPPLY_PROP_CHARGE_TYPE,
616 	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
617 	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
618 	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
619 	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
620 	POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
621 	POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT,
622 	POWER_SUPPLY_PROP_PRECHARGE_CURRENT,
623 	POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
624 	POWER_SUPPLY_PROP_USB_TYPE,
625 };
626 
627 static enum power_supply_usb_type mt6370_chg_usb_types[] = {
628 	POWER_SUPPLY_USB_TYPE_UNKNOWN,
629 	POWER_SUPPLY_USB_TYPE_SDP,
630 	POWER_SUPPLY_USB_TYPE_CDP,
631 	POWER_SUPPLY_USB_TYPE_DCP,
632 };
633 
634 static const struct power_supply_desc mt6370_chg_psy_desc = {
635 	.name = "mt6370-charger",
636 	.type = POWER_SUPPLY_TYPE_USB,
637 	.properties = mt6370_chg_properties,
638 	.num_properties = ARRAY_SIZE(mt6370_chg_properties),
639 	.get_property = mt6370_chg_get_property,
640 	.set_property = mt6370_chg_set_property,
641 	.property_is_writeable = mt6370_chg_property_is_writeable,
642 	.usb_types = mt6370_chg_usb_types,
643 	.num_usb_types = ARRAY_SIZE(mt6370_chg_usb_types),
644 };
645 
646 static const struct regulator_ops mt6370_chg_otg_ops = {
647 	.list_voltage = regulator_list_voltage_linear,
648 	.enable = regulator_enable_regmap,
649 	.disable = regulator_disable_regmap,
650 	.is_enabled = regulator_is_enabled_regmap,
651 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
652 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
653 	.set_current_limit = regulator_set_current_limit_regmap,
654 	.get_current_limit = regulator_get_current_limit_regmap,
655 };
656 
657 static const u32 mt6370_chg_otg_oc_ma[] = {
658 	500000, 700000, 1100000, 1300000, 1800000, 2100000, 2400000,
659 };
660 
661 static const struct regulator_desc mt6370_chg_otg_rdesc = {
662 	.of_match = "usb-otg-vbus-regulator",
663 	.of_parse_cb = mt6370_chg_otg_of_parse_cb,
664 	.name = "mt6370-usb-otg-vbus",
665 	.ops = &mt6370_chg_otg_ops,
666 	.owner = THIS_MODULE,
667 	.type = REGULATOR_VOLTAGE,
668 	.min_uV = 4425000,
669 	.uV_step = 25000,
670 	.n_voltages = 57,
671 	.vsel_reg = MT6370_REG_CHG_CTRL5,
672 	.vsel_mask = MT6370_VOBST_MASK,
673 	.enable_reg = MT6370_REG_CHG_CTRL1,
674 	.enable_mask = MT6370_OPA_MODE_MASK,
675 	.curr_table = mt6370_chg_otg_oc_ma,
676 	.n_current_limits = ARRAY_SIZE(mt6370_chg_otg_oc_ma),
677 	.csel_reg = MT6370_REG_CHG_CTRL10,
678 	.csel_mask = MT6370_OTG_OC_MASK,
679 };
680 
681 static int mt6370_chg_init_rmap_fields(struct mt6370_priv *priv)
682 {
683 	int i;
684 	const struct mt6370_chg_field *fds = mt6370_chg_fields;
685 
686 	for (i = 0; i < F_MAX; i++) {
687 		priv->rmap_fields[i] = devm_regmap_field_alloc(priv->dev,
688 							       priv->regmap,
689 							       fds[i].field);
690 		if (IS_ERR(priv->rmap_fields[i]))
691 			return dev_err_probe(priv->dev,
692 					PTR_ERR(priv->rmap_fields[i]),
693 					"Failed to allocate regmapfield[%s]\n",
694 					fds[i].name);
695 	}
696 
697 	return 0;
698 }
699 
700 static int mt6370_chg_init_setting(struct mt6370_priv *priv)
701 {
702 	int ret;
703 
704 	/* Disable usb_chg_en */
705 	ret = mt6370_chg_field_set(priv, F_USBCHGEN, 0);
706 	if (ret) {
707 		dev_err(priv->dev, "Failed to disable usb_chg_en\n");
708 		return ret;
709 	}
710 
711 	/* Disable input current limit */
712 	ret = mt6370_chg_field_set(priv, F_ILIM_EN, 0);
713 	if (ret) {
714 		dev_err(priv->dev, "Failed to disable input current limit\n");
715 		return ret;
716 	}
717 
718 	/* ICHG/IEOC Workaround, ICHG can not be set less than 900mA */
719 	ret = mt6370_chg_field_set(priv, F_ICHG, 900000);
720 	if (ret) {
721 		dev_err(priv->dev, "Failed to set ICHG to 900mA");
722 		return ret;
723 	}
724 
725 	/* Change input current limit selection to using IAICR results */
726 	ret = mt6370_chg_field_set(priv, F_IINLMTSEL, 2);
727 	if (ret) {
728 		dev_err(priv->dev, "Failed to set IINLMTSEL\n");
729 		return ret;
730 	}
731 
732 	return 0;
733 }
734 
735 #define MT6370_CHG_DT_PROP_DECL(_name, _type, _field)	\
736 {							\
737 	.name = "mediatek,chg-" #_name,			\
738 	.type = MT6370_PARSE_TYPE_##_type,		\
739 	.fd = _field,					\
740 }
741 
742 static int mt6370_chg_init_otg_regulator(struct mt6370_priv *priv)
743 {
744 	struct regulator_config rcfg = {
745 		.dev = priv->dev,
746 		.regmap = priv->regmap,
747 		.driver_data = priv,
748 	};
749 
750 	priv->rdev = devm_regulator_register(priv->dev, &mt6370_chg_otg_rdesc,
751 					     &rcfg);
752 
753 	return PTR_ERR_OR_ZERO(priv->rdev);
754 }
755 
756 static int mt6370_chg_init_psy(struct mt6370_priv *priv)
757 {
758 	struct power_supply_config cfg = {
759 		.drv_data = priv,
760 		.of_node = dev_of_node(priv->dev),
761 	};
762 
763 	priv->psy = devm_power_supply_register(priv->dev, &mt6370_chg_psy_desc,
764 					       &cfg);
765 
766 	return PTR_ERR_OR_ZERO(priv->psy);
767 }
768 
769 static void mt6370_chg_destroy_attach_lock(void *data)
770 {
771 	struct mutex *attach_lock = data;
772 
773 	mutex_destroy(attach_lock);
774 }
775 
776 static void mt6370_chg_destroy_wq(void *data)
777 {
778 	struct workqueue_struct *wq = data;
779 
780 	flush_workqueue(wq);
781 	destroy_workqueue(wq);
782 }
783 
784 static irqreturn_t mt6370_attach_i_handler(int irq, void *data)
785 {
786 	struct mt6370_priv *priv = data;
787 	unsigned int otg_en;
788 	int ret;
789 
790 	/* Check in OTG mode or not */
791 	ret = mt6370_chg_field_get(priv, F_BOOST_STAT, &otg_en);
792 	if (ret) {
793 		dev_err(priv->dev, "Failed to get OTG state\n");
794 		return IRQ_NONE;
795 	}
796 
797 	if (otg_en)
798 		return IRQ_HANDLED;
799 
800 	mutex_lock(&priv->attach_lock);
801 	priv->attach = MT6370_ATTACH_STAT_ATTACH_BC12_DONE;
802 	mutex_unlock(&priv->attach_lock);
803 
804 	if (!queue_work(priv->wq, &priv->bc12_work))
805 		dev_err(priv->dev, "bc12 work has already queued\n");
806 
807 	return IRQ_HANDLED;
808 }
809 
810 static irqreturn_t mt6370_uvp_d_evt_handler(int irq, void *data)
811 {
812 	struct mt6370_priv *priv = data;
813 
814 	mt6370_chg_pwr_rdy_check(priv);
815 
816 	return IRQ_HANDLED;
817 }
818 
819 static irqreturn_t mt6370_mivr_handler(int irq, void *data)
820 {
821 	struct mt6370_priv *priv = data;
822 
823 	pm_stay_awake(priv->dev);
824 	disable_irq_nosync(priv->irq_nums[MT6370_IRQ_MIVR]);
825 	schedule_delayed_work(&priv->mivr_dwork, msecs_to_jiffies(200));
826 
827 	return IRQ_HANDLED;
828 }
829 
830 #define MT6370_CHG_IRQ(_name)						\
831 {									\
832 	.name = #_name,							\
833 	.handler = mt6370_##_name##_handler,				\
834 }
835 
836 static int mt6370_chg_init_irq(struct mt6370_priv *priv)
837 {
838 	int i, ret;
839 	const struct {
840 		char *name;
841 		irq_handler_t handler;
842 	} mt6370_chg_irqs[] = {
843 		MT6370_CHG_IRQ(attach_i),
844 		MT6370_CHG_IRQ(uvp_d_evt),
845 		MT6370_CHG_IRQ(mivr),
846 	};
847 
848 	for (i = 0; i < ARRAY_SIZE(mt6370_chg_irqs); i++) {
849 		ret = platform_get_irq_byname(to_platform_device(priv->dev),
850 					      mt6370_chg_irqs[i].name);
851 		if (ret < 0)
852 			return dev_err_probe(priv->dev, ret,
853 					     "Failed to get irq %s\n",
854 					     mt6370_chg_irqs[i].name);
855 
856 		priv->irq_nums[i] = ret;
857 		ret = devm_request_threaded_irq(priv->dev, ret, NULL,
858 						mt6370_chg_irqs[i].handler,
859 						IRQF_TRIGGER_FALLING,
860 						dev_name(priv->dev), priv);
861 		if (ret)
862 			return dev_err_probe(priv->dev, ret,
863 					     "Failed to request irq %s\n",
864 					     mt6370_chg_irqs[i].name);
865 	}
866 
867 	return 0;
868 }
869 
870 static int mt6370_chg_probe(struct platform_device *pdev)
871 {
872 	struct device *dev = &pdev->dev;
873 	struct mt6370_priv *priv;
874 	int ret;
875 
876 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
877 	if (!priv)
878 		return -ENOMEM;
879 
880 	priv->dev = &pdev->dev;
881 
882 	priv->regmap = dev_get_regmap(pdev->dev.parent, NULL);
883 	if (!priv->regmap)
884 		return dev_err_probe(dev, -ENODEV, "Failed to get regmap\n");
885 
886 	ret = mt6370_chg_init_rmap_fields(priv);
887 	if (ret)
888 		return dev_err_probe(dev, ret, "Failed to init regmap fields\n");
889 
890 	platform_set_drvdata(pdev, priv);
891 
892 	priv->iio_adcs = devm_iio_channel_get_all(priv->dev);
893 	if (IS_ERR(priv->iio_adcs))
894 		return dev_err_probe(dev, PTR_ERR(priv->iio_adcs),
895 				     "Failed to get iio adc\n");
896 
897 	ret = mt6370_chg_init_otg_regulator(priv);
898 	if (ret)
899 		return dev_err_probe(dev, ret, "Failed to init OTG regulator\n");
900 
901 	ret = mt6370_chg_init_psy(priv);
902 	if (ret)
903 		return dev_err_probe(dev, ret, "Failed to init psy\n");
904 
905 	mutex_init(&priv->attach_lock);
906 	ret = devm_add_action_or_reset(dev, mt6370_chg_destroy_attach_lock,
907 				       &priv->attach_lock);
908 	if (ret)
909 		return dev_err_probe(dev, ret, "Failed to init attach lock\n");
910 
911 	priv->attach = MT6370_ATTACH_STAT_DETACH;
912 
913 	priv->wq = create_singlethread_workqueue(dev_name(priv->dev));
914 	if (!priv->wq)
915 		return dev_err_probe(dev, -ENOMEM,
916 				     "Failed to create workqueue\n");
917 
918 	ret = devm_add_action_or_reset(dev, mt6370_chg_destroy_wq, priv->wq);
919 	if (ret)
920 		return dev_err_probe(dev, ret, "Failed to init wq\n");
921 
922 	ret = devm_work_autocancel(dev, &priv->bc12_work, mt6370_chg_bc12_work_func);
923 	if (ret)
924 		return dev_err_probe(dev, ret, "Failed to init bc12 work\n");
925 
926 	ret = devm_delayed_work_autocancel(dev, &priv->mivr_dwork, mt6370_chg_mivr_dwork_func);
927 	if (ret)
928 		return dev_err_probe(dev, ret, "Failed to init mivr delayed work\n");
929 
930 	ret = mt6370_chg_init_setting(priv);
931 	if (ret)
932 		return dev_err_probe(dev, ret,
933 				     "Failed to init mt6370 charger setting\n");
934 
935 	ret = mt6370_chg_init_irq(priv);
936 	if (ret)
937 		return ret;
938 
939 	mt6370_chg_pwr_rdy_check(priv);
940 
941 	return 0;
942 }
943 
944 static const struct of_device_id mt6370_chg_of_match[] = {
945 	{ .compatible = "mediatek,mt6370-charger", },
946 	{}
947 };
948 MODULE_DEVICE_TABLE(of, mt6370_chg_of_match);
949 
950 static struct platform_driver mt6370_chg_driver = {
951 	.probe = mt6370_chg_probe,
952 	.driver = {
953 		.name = "mt6370-charger",
954 		.of_match_table = mt6370_chg_of_match,
955 	},
956 };
957 module_platform_driver(mt6370_chg_driver);
958 
959 MODULE_AUTHOR("ChiaEn Wu <chiaen_wu@richtek.com>");
960 MODULE_DESCRIPTION("MediaTek MT6370 Charger Driver");
961 MODULE_LICENSE("GPL v2");
962