1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Motorola CPCAP PMIC battery charger driver
4  *
5  * Copyright (C) 2017 Tony Lindgren <tony@atomide.com>
6  *
7  * Rewritten for Linux power framework with some parts based on
8  * on earlier driver found in the Motorola Linux kernel:
9  *
10  * Copyright (C) 2009-2010 Motorola, Inc.
11  */
12 
13 #include <linux/atomic.h>
14 #include <linux/init.h>
15 #include <linux/module.h>
16 #include <linux/slab.h>
17 #include <linux/err.h>
18 #include <linux/interrupt.h>
19 #include <linux/notifier.h>
20 #include <linux/of.h>
21 #include <linux/of_platform.h>
22 #include <linux/platform_device.h>
23 #include <linux/power_supply.h>
24 #include <linux/regmap.h>
25 
26 #include <linux/gpio/consumer.h>
27 #include <linux/usb/phy_companion.h>
28 #include <linux/phy/omap_usb.h>
29 #include <linux/usb/otg.h>
30 #include <linux/iio/consumer.h>
31 #include <linux/mfd/motorola-cpcap.h>
32 
33 /*
34  * CPCAP_REG_CRM register bits. For documentation of somewhat similar hardware,
35  * see NXP "MC13783 Power Management and Audio Circuit Users's Guide"
36  * MC13783UG.pdf chapter "8.5 Battery Interface Register Summary". The registers
37  * and values for CPCAP are different, but some of the internal components seem
38  * similar. Also see the Motorola Linux kernel cpcap-regbits.h. CPCAP_REG_CHRGR_1
39  * bits that seem to describe the CRM register.
40  */
41 #define CPCAP_REG_CRM_UNUSED_641_15	BIT(15)	/* 641 = register number */
42 #define CPCAP_REG_CRM_UNUSED_641_14	BIT(14)	/* 641 = register number */
43 #define CPCAP_REG_CRM_CHRG_LED_EN	BIT(13)	/* Charger LED */
44 #define CPCAP_REG_CRM_RVRSMODE		BIT(12)	/* USB VBUS output enable */
45 #define CPCAP_REG_CRM_ICHRG_TR1		BIT(11)	/* Trickle charge current */
46 #define CPCAP_REG_CRM_ICHRG_TR0		BIT(10)
47 #define CPCAP_REG_CRM_FET_OVRD		BIT(9)	/* 0 = hardware, 1 = FET_CTRL */
48 #define CPCAP_REG_CRM_FET_CTRL		BIT(8)	/* BPFET 1 if FET_OVRD set */
49 #define CPCAP_REG_CRM_VCHRG3		BIT(7)	/* Charge voltage bits */
50 #define CPCAP_REG_CRM_VCHRG2		BIT(6)
51 #define CPCAP_REG_CRM_VCHRG1		BIT(5)
52 #define CPCAP_REG_CRM_VCHRG0		BIT(4)
53 #define CPCAP_REG_CRM_ICHRG3		BIT(3)	/* Charge current bits */
54 #define CPCAP_REG_CRM_ICHRG2		BIT(2)
55 #define CPCAP_REG_CRM_ICHRG1		BIT(1)
56 #define CPCAP_REG_CRM_ICHRG0		BIT(0)
57 
58 /* CPCAP_REG_CRM trickle charge voltages */
59 #define CPCAP_REG_CRM_TR(val)		(((val) & 0x3) << 10)
60 #define CPCAP_REG_CRM_TR_0A00		CPCAP_REG_CRM_TR(0x0)
61 #define CPCAP_REG_CRM_TR_0A24		CPCAP_REG_CRM_TR(0x1)
62 #define CPCAP_REG_CRM_TR_0A48		CPCAP_REG_CRM_TR(0x2)
63 #define CPCAP_REG_CRM_TR_0A72		CPCAP_REG_CRM_TR(0x4)
64 
65 /*
66  * CPCAP_REG_CRM charge voltages based on the ADC channel 1 values.
67  * Note that these register bits don't match MC13783UG.pdf VCHRG
68  * register bits.
69  */
70 #define CPCAP_REG_CRM_VCHRG(val)	(((val) & 0xf) << 4)
71 #define CPCAP_REG_CRM_VCHRG_3V80	CPCAP_REG_CRM_VCHRG(0x0)
72 #define CPCAP_REG_CRM_VCHRG_4V10	CPCAP_REG_CRM_VCHRG(0x1)
73 #define CPCAP_REG_CRM_VCHRG_4V12	CPCAP_REG_CRM_VCHRG(0x2)
74 #define CPCAP_REG_CRM_VCHRG_4V15	CPCAP_REG_CRM_VCHRG(0x3)
75 #define CPCAP_REG_CRM_VCHRG_4V17	CPCAP_REG_CRM_VCHRG(0x4)
76 #define CPCAP_REG_CRM_VCHRG_4V20	CPCAP_REG_CRM_VCHRG(0x5)
77 #define CPCAP_REG_CRM_VCHRG_4V23	CPCAP_REG_CRM_VCHRG(0x6)
78 #define CPCAP_REG_CRM_VCHRG_4V25	CPCAP_REG_CRM_VCHRG(0x7)
79 #define CPCAP_REG_CRM_VCHRG_4V27	CPCAP_REG_CRM_VCHRG(0x8)
80 #define CPCAP_REG_CRM_VCHRG_4V30	CPCAP_REG_CRM_VCHRG(0x9)
81 #define CPCAP_REG_CRM_VCHRG_4V33	CPCAP_REG_CRM_VCHRG(0xa)
82 #define CPCAP_REG_CRM_VCHRG_4V35	CPCAP_REG_CRM_VCHRG(0xb)
83 #define CPCAP_REG_CRM_VCHRG_4V38	CPCAP_REG_CRM_VCHRG(0xc)
84 #define CPCAP_REG_CRM_VCHRG_4V40	CPCAP_REG_CRM_VCHRG(0xd)
85 #define CPCAP_REG_CRM_VCHRG_4V42	CPCAP_REG_CRM_VCHRG(0xe)
86 #define CPCAP_REG_CRM_VCHRG_4V44	CPCAP_REG_CRM_VCHRG(0xf)
87 
88 /*
89  * CPCAP_REG_CRM charge currents. These seem to match MC13783UG.pdf
90  * values in "Table 8-3. Charge Path Regulator Current Limit
91  * Characteristics" for the nominal values.
92  *
93  * Except 70mA and 1.596A and unlimited, these are simply 88.7mA / step.
94  */
95 #define CPCAP_REG_CRM_ICHRG(val)	(((val) & 0xf) << 0)
96 #define CPCAP_REG_CRM_ICHRG_0A000	CPCAP_REG_CRM_ICHRG(0x0)
97 #define CPCAP_REG_CRM_ICHRG_0A070	CPCAP_REG_CRM_ICHRG(0x1)
98 #define CPCAP_REG_CRM_ICHRG_0A177	CPCAP_REG_CRM_ICHRG(0x2)
99 #define CPCAP_REG_CRM_ICHRG_0A266	CPCAP_REG_CRM_ICHRG(0x3)
100 #define CPCAP_REG_CRM_ICHRG_0A355	CPCAP_REG_CRM_ICHRG(0x4)
101 #define CPCAP_REG_CRM_ICHRG_0A443	CPCAP_REG_CRM_ICHRG(0x5)
102 #define CPCAP_REG_CRM_ICHRG_0A532	CPCAP_REG_CRM_ICHRG(0x6)
103 #define CPCAP_REG_CRM_ICHRG_0A621	CPCAP_REG_CRM_ICHRG(0x7)
104 #define CPCAP_REG_CRM_ICHRG_0A709	CPCAP_REG_CRM_ICHRG(0x8)
105 #define CPCAP_REG_CRM_ICHRG_0A798	CPCAP_REG_CRM_ICHRG(0x9)
106 #define CPCAP_REG_CRM_ICHRG_0A886	CPCAP_REG_CRM_ICHRG(0xa)
107 #define CPCAP_REG_CRM_ICHRG_0A975	CPCAP_REG_CRM_ICHRG(0xb)
108 #define CPCAP_REG_CRM_ICHRG_1A064	CPCAP_REG_CRM_ICHRG(0xc)
109 #define CPCAP_REG_CRM_ICHRG_1A152	CPCAP_REG_CRM_ICHRG(0xd)
110 #define CPCAP_REG_CRM_ICHRG_1A596	CPCAP_REG_CRM_ICHRG(0xe)
111 #define CPCAP_REG_CRM_ICHRG_NO_LIMIT	CPCAP_REG_CRM_ICHRG(0xf)
112 
113 /* CPCAP_REG_VUSBC register bits needed for VBUS */
114 #define CPCAP_BIT_VBUS_SWITCH		BIT(0)	/* VBUS boost to 5V */
115 
116 enum {
117 	CPCAP_CHARGER_IIO_BATTDET,
118 	CPCAP_CHARGER_IIO_VOLTAGE,
119 	CPCAP_CHARGER_IIO_VBUS,
120 	CPCAP_CHARGER_IIO_CHRG_CURRENT,
121 	CPCAP_CHARGER_IIO_BATT_CURRENT,
122 	CPCAP_CHARGER_IIO_NR,
123 };
124 
125 struct cpcap_charger_ddata {
126 	struct device *dev;
127 	struct regmap *reg;
128 	struct list_head irq_list;
129 	struct delayed_work detect_work;
130 	struct delayed_work vbus_work;
131 	struct gpio_desc *gpio[2];		/* gpio_reven0 & 1 */
132 
133 	struct iio_channel *channels[CPCAP_CHARGER_IIO_NR];
134 
135 	struct power_supply *usb;
136 
137 	struct phy_companion comparator;	/* For USB VBUS */
138 	unsigned int vbus_enabled:1;
139 	unsigned int feeding_vbus:1;
140 	atomic_t active;
141 
142 	int status;
143 	int voltage;
144 	int limit_current;
145 };
146 
147 struct cpcap_interrupt_desc {
148 	int irq;
149 	struct list_head node;
150 	const char *name;
151 };
152 
153 struct cpcap_charger_ints_state {
154 	bool chrg_det;
155 	bool rvrs_chrg;
156 	bool vbusov;
157 
158 	bool chrg_se1b;
159 	bool rvrs_mode;
160 	bool chrgcurr2;
161 	bool chrgcurr1;
162 	bool vbusvld;
163 
164 	bool battdetb;
165 };
166 
167 static enum power_supply_property cpcap_charger_props[] = {
168 	POWER_SUPPLY_PROP_STATUS,
169 	POWER_SUPPLY_PROP_ONLINE,
170 	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
171 	POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
172 	POWER_SUPPLY_PROP_VOLTAGE_NOW,
173 	POWER_SUPPLY_PROP_CURRENT_NOW,
174 };
175 
176 static int cpcap_charger_get_charge_voltage(struct cpcap_charger_ddata *ddata)
177 {
178 	struct iio_channel *channel;
179 	int error, value = 0;
180 
181 	channel = ddata->channels[CPCAP_CHARGER_IIO_VOLTAGE];
182 	error = iio_read_channel_processed(channel, &value);
183 	if (error < 0) {
184 		dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
185 
186 		return 0;
187 	}
188 
189 	return value;
190 }
191 
192 static int cpcap_charger_get_charge_current(struct cpcap_charger_ddata *ddata)
193 {
194 	struct iio_channel *channel;
195 	int error, value = 0;
196 
197 	channel = ddata->channels[CPCAP_CHARGER_IIO_CHRG_CURRENT];
198 	error = iio_read_channel_processed(channel, &value);
199 	if (error < 0) {
200 		dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
201 
202 		return 0;
203 	}
204 
205 	return value;
206 }
207 
208 static int cpcap_charger_get_property(struct power_supply *psy,
209 				      enum power_supply_property psp,
210 				      union power_supply_propval *val)
211 {
212 	struct cpcap_charger_ddata *ddata = dev_get_drvdata(psy->dev.parent);
213 
214 	switch (psp) {
215 	case POWER_SUPPLY_PROP_STATUS:
216 		val->intval = ddata->status;
217 		break;
218 	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
219 		val->intval = ddata->limit_current;
220 		break;
221 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
222 		val->intval = ddata->voltage;
223 		break;
224 	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
225 		if (ddata->status == POWER_SUPPLY_STATUS_CHARGING)
226 			val->intval = cpcap_charger_get_charge_voltage(ddata) *
227 				1000;
228 		else
229 			val->intval = 0;
230 		break;
231 	case POWER_SUPPLY_PROP_CURRENT_NOW:
232 		if (ddata->status == POWER_SUPPLY_STATUS_CHARGING)
233 			val->intval = cpcap_charger_get_charge_current(ddata) *
234 				1000;
235 		else
236 			val->intval = 0;
237 		break;
238 	case POWER_SUPPLY_PROP_ONLINE:
239 		val->intval = ddata->status == POWER_SUPPLY_STATUS_CHARGING;
240 		break;
241 	default:
242 		return -EINVAL;
243 	}
244 
245 	return 0;
246 }
247 
248 static int cpcap_charger_match_voltage(int voltage)
249 {
250 	switch (voltage) {
251 	case 0 ... 4100000 - 1: return 3800000;
252 	case 4100000 ... 4120000 - 1: return 4100000;
253 	case 4120000 ... 4150000 - 1: return 4120000;
254 	case 4150000 ... 4170000 - 1: return 4150000;
255 	case 4170000 ... 4200000 - 1: return 4170000;
256 	case 4200000 ... 4230000 - 1: return 4200000;
257 	case 4230000 ... 4250000 - 1: return 4230000;
258 	case 4250000 ... 4270000 - 1: return 4250000;
259 	case 4270000 ... 4300000 - 1: return 4270000;
260 	case 4300000 ... 4330000 - 1: return 4300000;
261 	case 4330000 ... 4350000 - 1: return 4330000;
262 	case 4350000 ... 4380000 - 1: return 4350000;
263 	case 4380000 ... 4400000 - 1: return 4380000;
264 	case 4400000 ... 4420000 - 1: return 4400000;
265 	case 4420000 ... 4440000 - 1: return 4420000;
266 	case 4440000: return 4440000;
267 	default: return 0;
268 	}
269 }
270 
271 static int
272 cpcap_charger_get_bat_const_charge_voltage(struct cpcap_charger_ddata *ddata)
273 {
274 	union power_supply_propval prop;
275 	struct power_supply *battery;
276 	int voltage = ddata->voltage;
277 	int error;
278 
279 	battery = power_supply_get_by_name("battery");
280 	if (battery) {
281 		error = power_supply_get_property(battery,
282 				POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
283 				&prop);
284 		if (!error)
285 			voltage = prop.intval;
286 
287 		power_supply_put(battery);
288 	}
289 
290 	return voltage;
291 }
292 
293 static int cpcap_charger_current_to_regval(int microamp)
294 {
295 	int miliamp = microamp / 1000;
296 	int res;
297 
298 	if (miliamp < 0)
299 		return -EINVAL;
300 	if (miliamp < 70)
301 		return CPCAP_REG_CRM_ICHRG(0x0);
302 	if (miliamp < 177)
303 		return CPCAP_REG_CRM_ICHRG(0x1);
304 	if (miliamp >= 1596)
305 		return CPCAP_REG_CRM_ICHRG(0xe);
306 
307 	res = microamp / 88666;
308 	if (res > 0xd)
309 		res = 0xd;
310 	return CPCAP_REG_CRM_ICHRG(res);
311 }
312 
313 static int cpcap_charger_set_property(struct power_supply *psy,
314 				      enum power_supply_property psp,
315 				      const union power_supply_propval *val)
316 {
317 	struct cpcap_charger_ddata *ddata = dev_get_drvdata(psy->dev.parent);
318 	int voltage, batvolt;
319 
320 	switch (psp) {
321 	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
322 		if (cpcap_charger_current_to_regval(val->intval) < 0)
323 			return -EINVAL;
324 		ddata->limit_current = val->intval;
325 		schedule_delayed_work(&ddata->detect_work, 0);
326 		break;
327 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
328 		voltage = cpcap_charger_match_voltage(val->intval);
329 		batvolt = cpcap_charger_get_bat_const_charge_voltage(ddata);
330 		if (voltage > batvolt)
331 			voltage = batvolt;
332 		ddata->voltage = voltage;
333 		schedule_delayed_work(&ddata->detect_work, 0);
334 		break;
335 	default:
336 		return -EINVAL;
337 	}
338 
339 	return 0;
340 }
341 
342 static int cpcap_charger_property_is_writeable(struct power_supply *psy,
343 					       enum power_supply_property psp)
344 {
345 	switch (psp) {
346 	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
347 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
348 		return 1;
349 	default:
350 		return 0;
351 	}
352 }
353 
354 static void cpcap_charger_set_cable_path(struct cpcap_charger_ddata *ddata,
355 					 bool enabled)
356 {
357 	if (!ddata->gpio[0])
358 		return;
359 
360 	gpiod_set_value(ddata->gpio[0], enabled);
361 }
362 
363 static void cpcap_charger_set_inductive_path(struct cpcap_charger_ddata *ddata,
364 					     bool enabled)
365 {
366 	if (!ddata->gpio[1])
367 		return;
368 
369 	gpiod_set_value(ddata->gpio[1], enabled);
370 }
371 
372 static void cpcap_charger_update_state(struct cpcap_charger_ddata *ddata,
373 				       int state)
374 {
375 	const char *status;
376 
377 	if (state > POWER_SUPPLY_STATUS_FULL) {
378 		dev_warn(ddata->dev, "unknown state: %i\n", state);
379 
380 		return;
381 	}
382 
383 	ddata->status = state;
384 
385 	switch (state) {
386 	case POWER_SUPPLY_STATUS_DISCHARGING:
387 		status = "DISCONNECTED";
388 		break;
389 	case POWER_SUPPLY_STATUS_NOT_CHARGING:
390 		status = "DETECTING";
391 		break;
392 	case POWER_SUPPLY_STATUS_CHARGING:
393 		status = "CHARGING";
394 		break;
395 	case POWER_SUPPLY_STATUS_FULL:
396 		status = "DONE";
397 		break;
398 	default:
399 		return;
400 	}
401 
402 	dev_dbg(ddata->dev, "state: %s\n", status);
403 }
404 
405 static int cpcap_charger_disable(struct cpcap_charger_ddata *ddata)
406 {
407 	int error;
408 
409 	error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM, 0x3fff,
410 				   CPCAP_REG_CRM_FET_OVRD |
411 				   CPCAP_REG_CRM_FET_CTRL);
412 	if (error)
413 		dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
414 
415 	return error;
416 }
417 
418 static int cpcap_charger_enable(struct cpcap_charger_ddata *ddata,
419 				int max_voltage, int charge_current,
420 				int trickle_current)
421 {
422 	int error;
423 
424 	if (!max_voltage || !charge_current)
425 		return -EINVAL;
426 
427 	dev_dbg(ddata->dev, "enable: %i %i %i\n",
428 		max_voltage, charge_current, trickle_current);
429 
430 	error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM, 0x3fff,
431 				   CPCAP_REG_CRM_CHRG_LED_EN |
432 				   trickle_current |
433 				   CPCAP_REG_CRM_FET_OVRD |
434 				   CPCAP_REG_CRM_FET_CTRL |
435 				   max_voltage |
436 				   charge_current);
437 	if (error)
438 		dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
439 
440 	return error;
441 }
442 
443 static bool cpcap_charger_vbus_valid(struct cpcap_charger_ddata *ddata)
444 {
445 	int error, value = 0;
446 	struct iio_channel *channel =
447 		ddata->channels[CPCAP_CHARGER_IIO_VBUS];
448 
449 	error = iio_read_channel_processed(channel, &value);
450 	if (error >= 0)
451 		return value > 3900;
452 
453 	dev_err(ddata->dev, "error reading VBUS: %i\n", error);
454 
455 	return false;
456 }
457 
458 /* VBUS control functions for the USB PHY companion */
459 static void cpcap_charger_vbus_work(struct work_struct *work)
460 {
461 	struct cpcap_charger_ddata *ddata;
462 	bool vbus = false;
463 	int error;
464 
465 	ddata = container_of(work, struct cpcap_charger_ddata,
466 			     vbus_work.work);
467 
468 	if (ddata->vbus_enabled) {
469 		vbus = cpcap_charger_vbus_valid(ddata);
470 		if (vbus) {
471 			dev_dbg(ddata->dev, "VBUS already provided\n");
472 
473 			return;
474 		}
475 
476 		ddata->feeding_vbus = true;
477 		cpcap_charger_set_cable_path(ddata, false);
478 		cpcap_charger_set_inductive_path(ddata, false);
479 
480 		error = cpcap_charger_disable(ddata);
481 		if (error)
482 			goto out_err;
483 
484 		cpcap_charger_update_state(ddata,
485 					   POWER_SUPPLY_STATUS_DISCHARGING);
486 
487 		error = regmap_update_bits(ddata->reg, CPCAP_REG_VUSBC,
488 					   CPCAP_BIT_VBUS_SWITCH,
489 					   CPCAP_BIT_VBUS_SWITCH);
490 		if (error)
491 			goto out_err;
492 
493 		error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM,
494 					   CPCAP_REG_CRM_RVRSMODE,
495 					   CPCAP_REG_CRM_RVRSMODE);
496 		if (error)
497 			goto out_err;
498 	} else {
499 		error = regmap_update_bits(ddata->reg, CPCAP_REG_VUSBC,
500 					   CPCAP_BIT_VBUS_SWITCH, 0);
501 		if (error)
502 			goto out_err;
503 
504 		error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM,
505 					   CPCAP_REG_CRM_RVRSMODE, 0);
506 		if (error)
507 			goto out_err;
508 
509 		cpcap_charger_set_cable_path(ddata, true);
510 		cpcap_charger_set_inductive_path(ddata, true);
511 		ddata->feeding_vbus = false;
512 	}
513 
514 	return;
515 
516 out_err:
517 	cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_UNKNOWN);
518 	dev_err(ddata->dev, "%s could not %s vbus: %i\n", __func__,
519 		ddata->vbus_enabled ? "enable" : "disable", error);
520 }
521 
522 static int cpcap_charger_set_vbus(struct phy_companion *comparator,
523 				  bool enabled)
524 {
525 	struct cpcap_charger_ddata *ddata =
526 		container_of(comparator, struct cpcap_charger_ddata,
527 			     comparator);
528 
529 	ddata->vbus_enabled = enabled;
530 	schedule_delayed_work(&ddata->vbus_work, 0);
531 
532 	return 0;
533 }
534 
535 /* Charger interrupt handling functions */
536 
537 static int cpcap_charger_get_ints_state(struct cpcap_charger_ddata *ddata,
538 					struct cpcap_charger_ints_state *s)
539 {
540 	int val, error;
541 
542 	error = regmap_read(ddata->reg, CPCAP_REG_INTS1, &val);
543 	if (error)
544 		return error;
545 
546 	s->chrg_det = val & BIT(13);
547 	s->rvrs_chrg = val & BIT(12);
548 	s->vbusov = val & BIT(11);
549 
550 	error = regmap_read(ddata->reg, CPCAP_REG_INTS2, &val);
551 	if (error)
552 		return error;
553 
554 	s->chrg_se1b = val & BIT(13);
555 	s->rvrs_mode = val & BIT(6);
556 	s->chrgcurr2 = val & BIT(5);
557 	s->chrgcurr1 = val & BIT(4);
558 	s->vbusvld = val & BIT(3);
559 
560 	error = regmap_read(ddata->reg, CPCAP_REG_INTS4, &val);
561 	if (error)
562 		return error;
563 
564 	s->battdetb = val & BIT(6);
565 
566 	return 0;
567 }
568 
569 static int cpcap_charger_voltage_to_regval(int voltage)
570 {
571 	int offset;
572 
573 	switch (voltage) {
574 	case 0 ... 4100000 - 1:
575 		return 0;
576 	case 4100000 ... 4200000 - 1:
577 		offset = 1;
578 		break;
579 	case 4200000 ... 4300000 - 1:
580 		offset = 0;
581 		break;
582 	case 4300000 ... 4380000 - 1:
583 		offset = -1;
584 		break;
585 	case 4380000 ... 4440000:
586 		offset = -2;
587 		break;
588 	default:
589 		return 0;
590 	}
591 
592 	return ((voltage - 4100000) / 20000) + offset;
593 }
594 
595 static void cpcap_charger_disconnect(struct cpcap_charger_ddata *ddata,
596 				     int state, unsigned long delay)
597 {
598 	int error;
599 
600 	/* Update battery state before disconnecting the charger */
601 	switch (state) {
602 	case POWER_SUPPLY_STATUS_DISCHARGING:
603 	case POWER_SUPPLY_STATUS_FULL:
604 		power_supply_changed(ddata->usb);
605 		break;
606 	default:
607 		break;
608 	}
609 
610 	error = cpcap_charger_disable(ddata);
611 	if (error) {
612 		cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_UNKNOWN);
613 		return;
614 	}
615 
616 	cpcap_charger_update_state(ddata, state);
617 	power_supply_changed(ddata->usb);
618 	schedule_delayed_work(&ddata->detect_work, delay);
619 }
620 
621 static void cpcap_usb_detect(struct work_struct *work)
622 {
623 	struct cpcap_charger_ddata *ddata;
624 	struct cpcap_charger_ints_state s;
625 	int error, new_state;
626 
627 	ddata = container_of(work, struct cpcap_charger_ddata,
628 			     detect_work.work);
629 
630 	error = cpcap_charger_get_ints_state(ddata, &s);
631 	if (error)
632 		return;
633 
634 	/* Just init the state if a charger is connected with no chrg_det set */
635 	if (!s.chrg_det && s.chrgcurr1 && s.vbusvld) {
636 		cpcap_charger_update_state(ddata,
637 					   POWER_SUPPLY_STATUS_NOT_CHARGING);
638 
639 		return;
640 	}
641 
642 	/*
643 	 * If battery voltage is higher than charge voltage, it may have been
644 	 * charged to 4.35V by Android. Try again in 10 minutes.
645 	 */
646 	if (cpcap_charger_get_charge_voltage(ddata) > ddata->voltage) {
647 		cpcap_charger_disconnect(ddata,
648 					 POWER_SUPPLY_STATUS_NOT_CHARGING,
649 					 HZ * 60 * 10);
650 
651 		return;
652 	}
653 
654 	/* Delay for 80ms to avoid vbus bouncing when usb cable is plugged in */
655 	usleep_range(80000, 120000);
656 
657 	/* Throttle chrgcurr2 interrupt for charger done and retry */
658 	switch (ddata->status) {
659 	case POWER_SUPPLY_STATUS_CHARGING:
660 		if (s.chrgcurr2)
661 			break;
662 		new_state = POWER_SUPPLY_STATUS_FULL;
663 
664 		if (s.chrgcurr1 && s.vbusvld) {
665 			cpcap_charger_disconnect(ddata, new_state, HZ * 5);
666 			return;
667 		}
668 		break;
669 	case POWER_SUPPLY_STATUS_FULL:
670 		if (!s.chrgcurr2)
671 			break;
672 		if (s.vbusvld)
673 			new_state = POWER_SUPPLY_STATUS_NOT_CHARGING;
674 		else
675 			new_state = POWER_SUPPLY_STATUS_DISCHARGING;
676 
677 		cpcap_charger_disconnect(ddata, new_state, HZ * 5);
678 
679 		return;
680 	default:
681 		break;
682 	}
683 
684 	if (!ddata->feeding_vbus && cpcap_charger_vbus_valid(ddata) &&
685 	    s.chrgcurr1) {
686 		int max_current;
687 		int vchrg, ichrg;
688 		union power_supply_propval val;
689 		struct power_supply *battery;
690 
691 		battery = power_supply_get_by_name("battery");
692 		if (IS_ERR_OR_NULL(battery)) {
693 			dev_err(ddata->dev, "battery power_supply not available %li\n",
694 					PTR_ERR(battery));
695 			return;
696 		}
697 
698 		error = power_supply_get_property(battery, POWER_SUPPLY_PROP_PRESENT, &val);
699 		power_supply_put(battery);
700 		if (error)
701 			goto out_err;
702 
703 		if (val.intval) {
704 			max_current = 1596000;
705 		} else {
706 			dev_info(ddata->dev, "battery not inserted, charging disabled\n");
707 			max_current = 0;
708 		}
709 
710 		if (max_current > ddata->limit_current)
711 			max_current = ddata->limit_current;
712 
713 		ichrg = cpcap_charger_current_to_regval(max_current);
714 		vchrg = cpcap_charger_voltage_to_regval(ddata->voltage);
715 		error = cpcap_charger_enable(ddata,
716 					     CPCAP_REG_CRM_VCHRG(vchrg),
717 					     ichrg, 0);
718 		if (error)
719 			goto out_err;
720 		cpcap_charger_update_state(ddata,
721 					   POWER_SUPPLY_STATUS_CHARGING);
722 	} else {
723 		error = cpcap_charger_disable(ddata);
724 		if (error)
725 			goto out_err;
726 		cpcap_charger_update_state(ddata,
727 					   POWER_SUPPLY_STATUS_DISCHARGING);
728 	}
729 
730 	power_supply_changed(ddata->usb);
731 	return;
732 
733 out_err:
734 	cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_UNKNOWN);
735 	dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
736 }
737 
738 static irqreturn_t cpcap_charger_irq_thread(int irq, void *data)
739 {
740 	struct cpcap_charger_ddata *ddata = data;
741 
742 	if (!atomic_read(&ddata->active))
743 		return IRQ_NONE;
744 
745 	schedule_delayed_work(&ddata->detect_work, 0);
746 
747 	return IRQ_HANDLED;
748 }
749 
750 static int cpcap_usb_init_irq(struct platform_device *pdev,
751 			      struct cpcap_charger_ddata *ddata,
752 			      const char *name)
753 {
754 	struct cpcap_interrupt_desc *d;
755 	int irq, error;
756 
757 	irq = platform_get_irq_byname(pdev, name);
758 	if (irq < 0)
759 		return -ENODEV;
760 
761 	error = devm_request_threaded_irq(ddata->dev, irq, NULL,
762 					  cpcap_charger_irq_thread,
763 					  IRQF_SHARED | IRQF_ONESHOT,
764 					  name, ddata);
765 	if (error) {
766 		dev_err(ddata->dev, "could not get irq %s: %i\n",
767 			name, error);
768 
769 		return error;
770 	}
771 
772 	d = devm_kzalloc(ddata->dev, sizeof(*d), GFP_KERNEL);
773 	if (!d)
774 		return -ENOMEM;
775 
776 	d->name = name;
777 	d->irq = irq;
778 	list_add(&d->node, &ddata->irq_list);
779 
780 	return 0;
781 }
782 
783 static const char * const cpcap_charger_irqs[] = {
784 	/* REG_INT_0 */
785 	"chrg_det", "rvrs_chrg",
786 
787 	/* REG_INT1 */
788 	"chrg_se1b", "se0conn", "rvrs_mode", "chrgcurr2", "chrgcurr1", "vbusvld",
789 
790 	/* REG_INT_3 */
791 	"battdetb",
792 };
793 
794 static int cpcap_usb_init_interrupts(struct platform_device *pdev,
795 				     struct cpcap_charger_ddata *ddata)
796 {
797 	int i, error;
798 
799 	for (i = 0; i < ARRAY_SIZE(cpcap_charger_irqs); i++) {
800 		error = cpcap_usb_init_irq(pdev, ddata, cpcap_charger_irqs[i]);
801 		if (error)
802 			return error;
803 	}
804 
805 	return 0;
806 }
807 
808 static void cpcap_charger_init_optional_gpios(struct cpcap_charger_ddata *ddata)
809 {
810 	int i;
811 
812 	for (i = 0; i < 2; i++) {
813 		ddata->gpio[i] = devm_gpiod_get_index(ddata->dev, "mode",
814 						      i, GPIOD_OUT_HIGH);
815 		if (IS_ERR(ddata->gpio[i])) {
816 			dev_info(ddata->dev, "no mode change GPIO%i: %li\n",
817 				 i, PTR_ERR(ddata->gpio[i]));
818 			ddata->gpio[i] = NULL;
819 		}
820 	}
821 }
822 
823 static int cpcap_charger_init_iio(struct cpcap_charger_ddata *ddata)
824 {
825 	const char * const names[CPCAP_CHARGER_IIO_NR] = {
826 		"battdetb", "battp", "vbus", "chg_isense", "batti",
827 	};
828 	int error, i;
829 
830 	for (i = 0; i < CPCAP_CHARGER_IIO_NR; i++) {
831 		ddata->channels[i] = devm_iio_channel_get(ddata->dev,
832 							  names[i]);
833 		if (IS_ERR(ddata->channels[i])) {
834 			error = PTR_ERR(ddata->channels[i]);
835 			goto out_err;
836 		}
837 
838 		if (!ddata->channels[i]->indio_dev) {
839 			error = -ENXIO;
840 			goto out_err;
841 		}
842 	}
843 
844 	return 0;
845 
846 out_err:
847 	if (error != -EPROBE_DEFER)
848 		dev_err(ddata->dev, "could not initialize VBUS or ID IIO: %i\n",
849 			error);
850 
851 	return error;
852 }
853 
854 static char *cpcap_charger_supplied_to[] = {
855 	"battery",
856 };
857 
858 static const struct power_supply_desc cpcap_charger_usb_desc = {
859 	.name		= "usb",
860 	.type		= POWER_SUPPLY_TYPE_USB,
861 	.properties	= cpcap_charger_props,
862 	.num_properties	= ARRAY_SIZE(cpcap_charger_props),
863 	.get_property	= cpcap_charger_get_property,
864 	.set_property	= cpcap_charger_set_property,
865 	.property_is_writeable = cpcap_charger_property_is_writeable,
866 };
867 
868 #ifdef CONFIG_OF
869 static const struct of_device_id cpcap_charger_id_table[] = {
870 	{
871 		.compatible = "motorola,mapphone-cpcap-charger",
872 	},
873 	{},
874 };
875 MODULE_DEVICE_TABLE(of, cpcap_charger_id_table);
876 #endif
877 
878 static int cpcap_charger_probe(struct platform_device *pdev)
879 {
880 	struct cpcap_charger_ddata *ddata;
881 	const struct of_device_id *of_id;
882 	struct power_supply_config psy_cfg = {};
883 	int error;
884 
885 	of_id = of_match_device(of_match_ptr(cpcap_charger_id_table),
886 				&pdev->dev);
887 	if (!of_id)
888 		return -EINVAL;
889 
890 	ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
891 	if (!ddata)
892 		return -ENOMEM;
893 
894 	ddata->dev = &pdev->dev;
895 	ddata->voltage = 4200000;
896 	ddata->limit_current = 532000;
897 
898 	ddata->reg = dev_get_regmap(ddata->dev->parent, NULL);
899 	if (!ddata->reg)
900 		return -ENODEV;
901 
902 	INIT_LIST_HEAD(&ddata->irq_list);
903 	INIT_DELAYED_WORK(&ddata->detect_work, cpcap_usb_detect);
904 	INIT_DELAYED_WORK(&ddata->vbus_work, cpcap_charger_vbus_work);
905 	platform_set_drvdata(pdev, ddata);
906 
907 	error = cpcap_charger_init_iio(ddata);
908 	if (error)
909 		return error;
910 
911 	atomic_set(&ddata->active, 1);
912 
913 	psy_cfg.of_node = pdev->dev.of_node;
914 	psy_cfg.drv_data = ddata;
915 	psy_cfg.supplied_to = cpcap_charger_supplied_to;
916 	psy_cfg.num_supplicants = ARRAY_SIZE(cpcap_charger_supplied_to),
917 
918 	ddata->usb = devm_power_supply_register(ddata->dev,
919 						&cpcap_charger_usb_desc,
920 						&psy_cfg);
921 	if (IS_ERR(ddata->usb)) {
922 		error = PTR_ERR(ddata->usb);
923 		dev_err(ddata->dev, "failed to register USB charger: %i\n",
924 			error);
925 
926 		return error;
927 	}
928 
929 	error = cpcap_usb_init_interrupts(pdev, ddata);
930 	if (error)
931 		return error;
932 
933 	ddata->comparator.set_vbus = cpcap_charger_set_vbus;
934 	error = omap_usb2_set_comparator(&ddata->comparator);
935 	if (error == -ENODEV) {
936 		dev_info(ddata->dev, "charger needs phy, deferring probe\n");
937 		return -EPROBE_DEFER;
938 	}
939 
940 	cpcap_charger_init_optional_gpios(ddata);
941 
942 	schedule_delayed_work(&ddata->detect_work, 0);
943 
944 	return 0;
945 }
946 
947 static void cpcap_charger_shutdown(struct platform_device *pdev)
948 {
949 	struct cpcap_charger_ddata *ddata = platform_get_drvdata(pdev);
950 	int error;
951 
952 	atomic_set(&ddata->active, 0);
953 	error = omap_usb2_set_comparator(NULL);
954 	if (error)
955 		dev_warn(ddata->dev, "could not clear USB comparator: %i\n",
956 			 error);
957 
958 	error = cpcap_charger_disable(ddata);
959 	if (error) {
960 		cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_UNKNOWN);
961 		dev_warn(ddata->dev, "could not clear charger: %i\n",
962 			 error);
963 	}
964 	cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_DISCHARGING);
965 	cancel_delayed_work_sync(&ddata->vbus_work);
966 	cancel_delayed_work_sync(&ddata->detect_work);
967 }
968 
969 static int cpcap_charger_remove(struct platform_device *pdev)
970 {
971 	cpcap_charger_shutdown(pdev);
972 
973 	return 0;
974 }
975 
976 static struct platform_driver cpcap_charger_driver = {
977 	.probe = cpcap_charger_probe,
978 	.driver	= {
979 		.name	= "cpcap-charger",
980 		.of_match_table = of_match_ptr(cpcap_charger_id_table),
981 	},
982 	.shutdown = cpcap_charger_shutdown,
983 	.remove	= cpcap_charger_remove,
984 };
985 module_platform_driver(cpcap_charger_driver);
986 
987 MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
988 MODULE_DESCRIPTION("CPCAP Battery Charger Interface driver");
989 MODULE_LICENSE("GPL v2");
990 MODULE_ALIAS("platform:cpcap-charger");
991