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 /* No battery always shows temperature of -40000 */
177 static bool cpcap_charger_battery_found(struct cpcap_charger_ddata *ddata)
178 {
179 	struct iio_channel *channel;
180 	int error, temperature;
181 
182 	channel = ddata->channels[CPCAP_CHARGER_IIO_BATTDET];
183 	error = iio_read_channel_processed(channel, &temperature);
184 	if (error < 0) {
185 		dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
186 
187 		return false;
188 	}
189 
190 	return temperature > -20000 && temperature < 60000;
191 }
192 
193 static int cpcap_charger_get_charge_voltage(struct cpcap_charger_ddata *ddata)
194 {
195 	struct iio_channel *channel;
196 	int error, value = 0;
197 
198 	channel = ddata->channels[CPCAP_CHARGER_IIO_VOLTAGE];
199 	error = iio_read_channel_processed(channel, &value);
200 	if (error < 0) {
201 		dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
202 
203 		return 0;
204 	}
205 
206 	return value;
207 }
208 
209 static int cpcap_charger_get_charge_current(struct cpcap_charger_ddata *ddata)
210 {
211 	struct iio_channel *channel;
212 	int error, value = 0;
213 
214 	channel = ddata->channels[CPCAP_CHARGER_IIO_CHRG_CURRENT];
215 	error = iio_read_channel_processed(channel, &value);
216 	if (error < 0) {
217 		dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
218 
219 		return 0;
220 	}
221 
222 	return value;
223 }
224 
225 static int cpcap_charger_get_property(struct power_supply *psy,
226 				      enum power_supply_property psp,
227 				      union power_supply_propval *val)
228 {
229 	struct cpcap_charger_ddata *ddata = dev_get_drvdata(psy->dev.parent);
230 
231 	switch (psp) {
232 	case POWER_SUPPLY_PROP_STATUS:
233 		val->intval = ddata->status;
234 		break;
235 	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
236 		val->intval = ddata->limit_current;
237 		break;
238 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
239 		val->intval = ddata->voltage;
240 		break;
241 	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
242 		if (ddata->status == POWER_SUPPLY_STATUS_CHARGING)
243 			val->intval = cpcap_charger_get_charge_voltage(ddata) *
244 				1000;
245 		else
246 			val->intval = 0;
247 		break;
248 	case POWER_SUPPLY_PROP_CURRENT_NOW:
249 		if (ddata->status == POWER_SUPPLY_STATUS_CHARGING)
250 			val->intval = cpcap_charger_get_charge_current(ddata) *
251 				1000;
252 		else
253 			val->intval = 0;
254 		break;
255 	case POWER_SUPPLY_PROP_ONLINE:
256 		val->intval = ddata->status == POWER_SUPPLY_STATUS_CHARGING;
257 		break;
258 	default:
259 		return -EINVAL;
260 	}
261 
262 	return 0;
263 }
264 
265 static int cpcap_charger_match_voltage(int voltage)
266 {
267 	switch (voltage) {
268 	case 0 ... 4100000 - 1: return 3800000;
269 	case 4100000 ... 4120000 - 1: return 4100000;
270 	case 4120000 ... 4150000 - 1: return 4120000;
271 	case 4150000 ... 4170000 - 1: return 4150000;
272 	case 4170000 ... 4200000 - 1: return 4170000;
273 	case 4200000 ... 4230000 - 1: return 4200000;
274 	case 4230000 ... 4250000 - 1: return 4230000;
275 	case 4250000 ... 4270000 - 1: return 4250000;
276 	case 4270000 ... 4300000 - 1: return 4270000;
277 	case 4300000 ... 4330000 - 1: return 4300000;
278 	case 4330000 ... 4350000 - 1: return 4330000;
279 	case 4350000 ... 4380000 - 1: return 4350000;
280 	case 4380000 ... 4400000 - 1: return 4380000;
281 	case 4400000 ... 4420000 - 1: return 4400000;
282 	case 4420000 ... 4440000 - 1: return 4420000;
283 	case 4440000: return 4440000;
284 	default: return 0;
285 	}
286 }
287 
288 static int
289 cpcap_charger_get_bat_const_charge_voltage(struct cpcap_charger_ddata *ddata)
290 {
291 	union power_supply_propval prop;
292 	struct power_supply *battery;
293 	int voltage = ddata->voltage;
294 	int error;
295 
296 	battery = power_supply_get_by_name("battery");
297 	if (battery) {
298 		error = power_supply_get_property(battery,
299 				POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
300 				&prop);
301 		if (!error)
302 			voltage = prop.intval;
303 
304 		power_supply_put(battery);
305 	}
306 
307 	return voltage;
308 }
309 
310 static int cpcap_charger_current_to_regval(int microamp)
311 {
312 	int miliamp = microamp / 1000;
313 	int res;
314 
315 	if (miliamp < 0)
316 		return -EINVAL;
317 	if (miliamp < 70)
318 		return CPCAP_REG_CRM_ICHRG(0x0);
319 	if (miliamp < 177)
320 		return CPCAP_REG_CRM_ICHRG(0x1);
321 	if (miliamp >= 1596)
322 		return CPCAP_REG_CRM_ICHRG(0xe);
323 
324 	res = microamp / 88666;
325 	if (res > 0xd)
326 		res = 0xd;
327 	return CPCAP_REG_CRM_ICHRG(res);
328 }
329 
330 static int cpcap_charger_set_property(struct power_supply *psy,
331 				      enum power_supply_property psp,
332 				      const union power_supply_propval *val)
333 {
334 	struct cpcap_charger_ddata *ddata = dev_get_drvdata(psy->dev.parent);
335 	int voltage, batvolt;
336 
337 	switch (psp) {
338 	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
339 		if (cpcap_charger_current_to_regval(val->intval) < 0)
340 			return -EINVAL;
341 		ddata->limit_current = val->intval;
342 		schedule_delayed_work(&ddata->detect_work, 0);
343 		break;
344 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
345 		voltage = cpcap_charger_match_voltage(val->intval);
346 		batvolt = cpcap_charger_get_bat_const_charge_voltage(ddata);
347 		if (voltage > batvolt)
348 			voltage = batvolt;
349 		ddata->voltage = voltage;
350 		schedule_delayed_work(&ddata->detect_work, 0);
351 		break;
352 	default:
353 		return -EINVAL;
354 	}
355 
356 	return 0;
357 }
358 
359 static int cpcap_charger_property_is_writeable(struct power_supply *psy,
360 					       enum power_supply_property psp)
361 {
362 	switch (psp) {
363 	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
364 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
365 		return 1;
366 	default:
367 		return 0;
368 	}
369 }
370 
371 static void cpcap_charger_set_cable_path(struct cpcap_charger_ddata *ddata,
372 					 bool enabled)
373 {
374 	if (!ddata->gpio[0])
375 		return;
376 
377 	gpiod_set_value(ddata->gpio[0], enabled);
378 }
379 
380 static void cpcap_charger_set_inductive_path(struct cpcap_charger_ddata *ddata,
381 					     bool enabled)
382 {
383 	if (!ddata->gpio[1])
384 		return;
385 
386 	gpiod_set_value(ddata->gpio[1], enabled);
387 }
388 
389 static void cpcap_charger_update_state(struct cpcap_charger_ddata *ddata,
390 				       int state)
391 {
392 	const char *status;
393 
394 	if (state > POWER_SUPPLY_STATUS_FULL) {
395 		dev_warn(ddata->dev, "unknown state: %i\n", state);
396 
397 		return;
398 	}
399 
400 	ddata->status = state;
401 
402 	switch (state) {
403 	case POWER_SUPPLY_STATUS_DISCHARGING:
404 		status = "DISCONNECTED";
405 		break;
406 	case POWER_SUPPLY_STATUS_NOT_CHARGING:
407 		status = "DETECTING";
408 		break;
409 	case POWER_SUPPLY_STATUS_CHARGING:
410 		status = "CHARGING";
411 		break;
412 	case POWER_SUPPLY_STATUS_FULL:
413 		status = "DONE";
414 		break;
415 	default:
416 		return;
417 	}
418 
419 	dev_dbg(ddata->dev, "state: %s\n", status);
420 }
421 
422 static int cpcap_charger_disable(struct cpcap_charger_ddata *ddata)
423 {
424 	int error;
425 
426 	error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM, 0x3fff,
427 				   CPCAP_REG_CRM_FET_OVRD |
428 				   CPCAP_REG_CRM_FET_CTRL);
429 	if (error)
430 		dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
431 
432 	return error;
433 }
434 
435 static int cpcap_charger_enable(struct cpcap_charger_ddata *ddata,
436 				int max_voltage, int charge_current,
437 				int trickle_current)
438 {
439 	int error;
440 
441 	if (!max_voltage || !charge_current)
442 		return -EINVAL;
443 
444 	dev_dbg(ddata->dev, "enable: %i %i %i\n",
445 		max_voltage, charge_current, trickle_current);
446 
447 	error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM, 0x3fff,
448 				   CPCAP_REG_CRM_CHRG_LED_EN |
449 				   trickle_current |
450 				   CPCAP_REG_CRM_FET_OVRD |
451 				   CPCAP_REG_CRM_FET_CTRL |
452 				   max_voltage |
453 				   charge_current);
454 	if (error)
455 		dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
456 
457 	return error;
458 }
459 
460 static bool cpcap_charger_vbus_valid(struct cpcap_charger_ddata *ddata)
461 {
462 	int error, value = 0;
463 	struct iio_channel *channel =
464 		ddata->channels[CPCAP_CHARGER_IIO_VBUS];
465 
466 	error = iio_read_channel_processed(channel, &value);
467 	if (error >= 0)
468 		return value > 3900;
469 
470 	dev_err(ddata->dev, "error reading VBUS: %i\n", error);
471 
472 	return false;
473 }
474 
475 /* VBUS control functions for the USB PHY companion */
476 static void cpcap_charger_vbus_work(struct work_struct *work)
477 {
478 	struct cpcap_charger_ddata *ddata;
479 	bool vbus = false;
480 	int error;
481 
482 	ddata = container_of(work, struct cpcap_charger_ddata,
483 			     vbus_work.work);
484 
485 	if (ddata->vbus_enabled) {
486 		vbus = cpcap_charger_vbus_valid(ddata);
487 		if (vbus) {
488 			dev_dbg(ddata->dev, "VBUS already provided\n");
489 
490 			return;
491 		}
492 
493 		ddata->feeding_vbus = true;
494 		cpcap_charger_set_cable_path(ddata, false);
495 		cpcap_charger_set_inductive_path(ddata, false);
496 
497 		error = cpcap_charger_disable(ddata);
498 		if (error)
499 			goto out_err;
500 
501 		cpcap_charger_update_state(ddata,
502 					   POWER_SUPPLY_STATUS_DISCHARGING);
503 
504 		error = regmap_update_bits(ddata->reg, CPCAP_REG_VUSBC,
505 					   CPCAP_BIT_VBUS_SWITCH,
506 					   CPCAP_BIT_VBUS_SWITCH);
507 		if (error)
508 			goto out_err;
509 
510 		error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM,
511 					   CPCAP_REG_CRM_RVRSMODE,
512 					   CPCAP_REG_CRM_RVRSMODE);
513 		if (error)
514 			goto out_err;
515 	} else {
516 		error = regmap_update_bits(ddata->reg, CPCAP_REG_VUSBC,
517 					   CPCAP_BIT_VBUS_SWITCH, 0);
518 		if (error)
519 			goto out_err;
520 
521 		error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM,
522 					   CPCAP_REG_CRM_RVRSMODE, 0);
523 		if (error)
524 			goto out_err;
525 
526 		cpcap_charger_set_cable_path(ddata, true);
527 		cpcap_charger_set_inductive_path(ddata, true);
528 		ddata->feeding_vbus = false;
529 	}
530 
531 	return;
532 
533 out_err:
534 	cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_UNKNOWN);
535 	dev_err(ddata->dev, "%s could not %s vbus: %i\n", __func__,
536 		ddata->vbus_enabled ? "enable" : "disable", error);
537 }
538 
539 static int cpcap_charger_set_vbus(struct phy_companion *comparator,
540 				  bool enabled)
541 {
542 	struct cpcap_charger_ddata *ddata =
543 		container_of(comparator, struct cpcap_charger_ddata,
544 			     comparator);
545 
546 	ddata->vbus_enabled = enabled;
547 	schedule_delayed_work(&ddata->vbus_work, 0);
548 
549 	return 0;
550 }
551 
552 /* Charger interrupt handling functions */
553 
554 static int cpcap_charger_get_ints_state(struct cpcap_charger_ddata *ddata,
555 					struct cpcap_charger_ints_state *s)
556 {
557 	int val, error;
558 
559 	error = regmap_read(ddata->reg, CPCAP_REG_INTS1, &val);
560 	if (error)
561 		return error;
562 
563 	s->chrg_det = val & BIT(13);
564 	s->rvrs_chrg = val & BIT(12);
565 	s->vbusov = val & BIT(11);
566 
567 	error = regmap_read(ddata->reg, CPCAP_REG_INTS2, &val);
568 	if (error)
569 		return error;
570 
571 	s->chrg_se1b = val & BIT(13);
572 	s->rvrs_mode = val & BIT(6);
573 	s->chrgcurr2 = val & BIT(5);
574 	s->chrgcurr1 = val & BIT(4);
575 	s->vbusvld = val & BIT(3);
576 
577 	error = regmap_read(ddata->reg, CPCAP_REG_INTS4, &val);
578 	if (error)
579 		return error;
580 
581 	s->battdetb = val & BIT(6);
582 
583 	return 0;
584 }
585 
586 static int cpcap_charger_voltage_to_regval(int voltage)
587 {
588 	int offset;
589 
590 	switch (voltage) {
591 	case 0 ... 4100000 - 1:
592 		return 0;
593 	case 4100000 ... 4200000 - 1:
594 		offset = 1;
595 		break;
596 	case 4200000 ... 4300000 - 1:
597 		offset = 0;
598 		break;
599 	case 4300000 ... 4380000 - 1:
600 		offset = -1;
601 		break;
602 	case 4380000 ... 4440000:
603 		offset = -2;
604 		break;
605 	default:
606 		return 0;
607 	}
608 
609 	return ((voltage - 4100000) / 20000) + offset;
610 }
611 
612 static void cpcap_charger_disconnect(struct cpcap_charger_ddata *ddata,
613 				     int state, unsigned long delay)
614 {
615 	int error;
616 
617 	/* Update battery state before disconnecting the charger */
618 	switch (state) {
619 	case POWER_SUPPLY_STATUS_DISCHARGING:
620 	case POWER_SUPPLY_STATUS_FULL:
621 		power_supply_changed(ddata->usb);
622 		break;
623 	default:
624 		break;
625 	}
626 
627 	error = cpcap_charger_disable(ddata);
628 	if (error) {
629 		cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_UNKNOWN);
630 		return;
631 	}
632 
633 	cpcap_charger_update_state(ddata, state);
634 	power_supply_changed(ddata->usb);
635 	schedule_delayed_work(&ddata->detect_work, delay);
636 }
637 
638 static void cpcap_usb_detect(struct work_struct *work)
639 {
640 	struct cpcap_charger_ddata *ddata;
641 	struct cpcap_charger_ints_state s;
642 	int error, new_state;
643 
644 	ddata = container_of(work, struct cpcap_charger_ddata,
645 			     detect_work.work);
646 
647 	error = cpcap_charger_get_ints_state(ddata, &s);
648 	if (error)
649 		return;
650 
651 	/* Just init the state if a charger is connected with no chrg_det set */
652 	if (!s.chrg_det && s.chrgcurr1 && s.vbusvld) {
653 		cpcap_charger_update_state(ddata,
654 					   POWER_SUPPLY_STATUS_NOT_CHARGING);
655 
656 		return;
657 	}
658 
659 	/*
660 	 * If battery voltage is higher than charge voltage, it may have been
661 	 * charged to 4.35V by Android. Try again in 10 minutes.
662 	 */
663 	if (cpcap_charger_get_charge_voltage(ddata) > ddata->voltage) {
664 		cpcap_charger_disconnect(ddata,
665 					 POWER_SUPPLY_STATUS_NOT_CHARGING,
666 					 HZ * 60 * 10);
667 
668 		return;
669 	}
670 
671 	/* Delay for 80ms to avoid vbus bouncing when usb cable is plugged in */
672 	usleep_range(80000, 120000);
673 
674 	/* Throttle chrgcurr2 interrupt for charger done and retry */
675 	switch (ddata->status) {
676 	case POWER_SUPPLY_STATUS_CHARGING:
677 		if (s.chrgcurr2)
678 			break;
679 		new_state = POWER_SUPPLY_STATUS_FULL;
680 
681 		if (s.chrgcurr1 && s.vbusvld) {
682 			cpcap_charger_disconnect(ddata, new_state, HZ * 5);
683 			return;
684 		}
685 		break;
686 	case POWER_SUPPLY_STATUS_FULL:
687 		if (!s.chrgcurr2)
688 			break;
689 		if (s.vbusvld)
690 			new_state = POWER_SUPPLY_STATUS_NOT_CHARGING;
691 		else
692 			new_state = POWER_SUPPLY_STATUS_DISCHARGING;
693 
694 		cpcap_charger_disconnect(ddata, new_state, HZ * 5);
695 
696 		return;
697 	default:
698 		break;
699 	}
700 
701 	if (!ddata->feeding_vbus && cpcap_charger_vbus_valid(ddata) &&
702 	    s.chrgcurr1) {
703 		int max_current = 532000;
704 		int vchrg, ichrg;
705 
706 		if (cpcap_charger_battery_found(ddata))
707 			max_current = 1596000;
708 
709 		if (max_current > ddata->limit_current)
710 			max_current = ddata->limit_current;
711 
712 		ichrg = cpcap_charger_current_to_regval(max_current);
713 		vchrg = cpcap_charger_voltage_to_regval(ddata->voltage);
714 		error = cpcap_charger_enable(ddata,
715 					     CPCAP_REG_CRM_VCHRG(vchrg),
716 					     ichrg, 0);
717 		if (error)
718 			goto out_err;
719 		cpcap_charger_update_state(ddata,
720 					   POWER_SUPPLY_STATUS_CHARGING);
721 	} else {
722 		error = cpcap_charger_disable(ddata);
723 		if (error)
724 			goto out_err;
725 		cpcap_charger_update_state(ddata,
726 					   POWER_SUPPLY_STATUS_DISCHARGING);
727 	}
728 
729 	power_supply_changed(ddata->usb);
730 	return;
731 
732 out_err:
733 	cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_UNKNOWN);
734 	dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
735 }
736 
737 static irqreturn_t cpcap_charger_irq_thread(int irq, void *data)
738 {
739 	struct cpcap_charger_ddata *ddata = data;
740 
741 	if (!atomic_read(&ddata->active))
742 		return IRQ_NONE;
743 
744 	schedule_delayed_work(&ddata->detect_work, 0);
745 
746 	return IRQ_HANDLED;
747 }
748 
749 static int cpcap_usb_init_irq(struct platform_device *pdev,
750 			      struct cpcap_charger_ddata *ddata,
751 			      const char *name)
752 {
753 	struct cpcap_interrupt_desc *d;
754 	int irq, error;
755 
756 	irq = platform_get_irq_byname(pdev, name);
757 	if (irq < 0)
758 		return -ENODEV;
759 
760 	error = devm_request_threaded_irq(ddata->dev, irq, NULL,
761 					  cpcap_charger_irq_thread,
762 					  IRQF_SHARED | IRQF_ONESHOT,
763 					  name, ddata);
764 	if (error) {
765 		dev_err(ddata->dev, "could not get irq %s: %i\n",
766 			name, error);
767 
768 		return error;
769 	}
770 
771 	d = devm_kzalloc(ddata->dev, sizeof(*d), GFP_KERNEL);
772 	if (!d)
773 		return -ENOMEM;
774 
775 	d->name = name;
776 	d->irq = irq;
777 	list_add(&d->node, &ddata->irq_list);
778 
779 	return 0;
780 }
781 
782 static const char * const cpcap_charger_irqs[] = {
783 	/* REG_INT_0 */
784 	"chrg_det", "rvrs_chrg",
785 
786 	/* REG_INT1 */
787 	"chrg_se1b", "se0conn", "rvrs_mode", "chrgcurr2", "chrgcurr1", "vbusvld",
788 
789 	/* REG_INT_3 */
790 	"battdetb",
791 };
792 
793 static int cpcap_usb_init_interrupts(struct platform_device *pdev,
794 				     struct cpcap_charger_ddata *ddata)
795 {
796 	int i, error;
797 
798 	for (i = 0; i < ARRAY_SIZE(cpcap_charger_irqs); i++) {
799 		error = cpcap_usb_init_irq(pdev, ddata, cpcap_charger_irqs[i]);
800 		if (error)
801 			return error;
802 	}
803 
804 	return 0;
805 }
806 
807 static void cpcap_charger_init_optional_gpios(struct cpcap_charger_ddata *ddata)
808 {
809 	int i;
810 
811 	for (i = 0; i < 2; i++) {
812 		ddata->gpio[i] = devm_gpiod_get_index(ddata->dev, "mode",
813 						      i, GPIOD_OUT_HIGH);
814 		if (IS_ERR(ddata->gpio[i])) {
815 			dev_info(ddata->dev, "no mode change GPIO%i: %li\n",
816 				 i, PTR_ERR(ddata->gpio[i]));
817 			ddata->gpio[i] = NULL;
818 		}
819 	}
820 }
821 
822 static int cpcap_charger_init_iio(struct cpcap_charger_ddata *ddata)
823 {
824 	const char * const names[CPCAP_CHARGER_IIO_NR] = {
825 		"battdetb", "battp", "vbus", "chg_isense", "batti",
826 	};
827 	int error, i;
828 
829 	for (i = 0; i < CPCAP_CHARGER_IIO_NR; i++) {
830 		ddata->channels[i] = devm_iio_channel_get(ddata->dev,
831 							  names[i]);
832 		if (IS_ERR(ddata->channels[i])) {
833 			error = PTR_ERR(ddata->channels[i]);
834 			goto out_err;
835 		}
836 
837 		if (!ddata->channels[i]->indio_dev) {
838 			error = -ENXIO;
839 			goto out_err;
840 		}
841 	}
842 
843 	return 0;
844 
845 out_err:
846 	if (error != -EPROBE_DEFER)
847 		dev_err(ddata->dev, "could not initialize VBUS or ID IIO: %i\n",
848 			error);
849 
850 	return error;
851 }
852 
853 static char *cpcap_charger_supplied_to[] = {
854 	"battery",
855 };
856 
857 static const struct power_supply_desc cpcap_charger_usb_desc = {
858 	.name		= "usb",
859 	.type		= POWER_SUPPLY_TYPE_USB,
860 	.properties	= cpcap_charger_props,
861 	.num_properties	= ARRAY_SIZE(cpcap_charger_props),
862 	.get_property	= cpcap_charger_get_property,
863 	.set_property	= cpcap_charger_set_property,
864 	.property_is_writeable = cpcap_charger_property_is_writeable,
865 };
866 
867 #ifdef CONFIG_OF
868 static const struct of_device_id cpcap_charger_id_table[] = {
869 	{
870 		.compatible = "motorola,mapphone-cpcap-charger",
871 	},
872 	{},
873 };
874 MODULE_DEVICE_TABLE(of, cpcap_charger_id_table);
875 #endif
876 
877 static int cpcap_charger_probe(struct platform_device *pdev)
878 {
879 	struct cpcap_charger_ddata *ddata;
880 	const struct of_device_id *of_id;
881 	struct power_supply_config psy_cfg = {};
882 	int error;
883 
884 	of_id = of_match_device(of_match_ptr(cpcap_charger_id_table),
885 				&pdev->dev);
886 	if (!of_id)
887 		return -EINVAL;
888 
889 	ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
890 	if (!ddata)
891 		return -ENOMEM;
892 
893 	ddata->dev = &pdev->dev;
894 	ddata->voltage = 4200000;
895 	ddata->limit_current = 532000;
896 
897 	ddata->reg = dev_get_regmap(ddata->dev->parent, NULL);
898 	if (!ddata->reg)
899 		return -ENODEV;
900 
901 	INIT_LIST_HEAD(&ddata->irq_list);
902 	INIT_DELAYED_WORK(&ddata->detect_work, cpcap_usb_detect);
903 	INIT_DELAYED_WORK(&ddata->vbus_work, cpcap_charger_vbus_work);
904 	platform_set_drvdata(pdev, ddata);
905 
906 	error = cpcap_charger_init_iio(ddata);
907 	if (error)
908 		return error;
909 
910 	atomic_set(&ddata->active, 1);
911 
912 	psy_cfg.of_node = pdev->dev.of_node;
913 	psy_cfg.drv_data = ddata;
914 	psy_cfg.supplied_to = cpcap_charger_supplied_to;
915 	psy_cfg.num_supplicants = ARRAY_SIZE(cpcap_charger_supplied_to),
916 
917 	ddata->usb = devm_power_supply_register(ddata->dev,
918 						&cpcap_charger_usb_desc,
919 						&psy_cfg);
920 	if (IS_ERR(ddata->usb)) {
921 		error = PTR_ERR(ddata->usb);
922 		dev_err(ddata->dev, "failed to register USB charger: %i\n",
923 			error);
924 
925 		return error;
926 	}
927 
928 	error = cpcap_usb_init_interrupts(pdev, ddata);
929 	if (error)
930 		return error;
931 
932 	ddata->comparator.set_vbus = cpcap_charger_set_vbus;
933 	error = omap_usb2_set_comparator(&ddata->comparator);
934 	if (error == -ENODEV) {
935 		dev_info(ddata->dev, "charger needs phy, deferring probe\n");
936 		return -EPROBE_DEFER;
937 	}
938 
939 	cpcap_charger_init_optional_gpios(ddata);
940 
941 	schedule_delayed_work(&ddata->detect_work, 0);
942 
943 	return 0;
944 }
945 
946 static void cpcap_charger_shutdown(struct platform_device *pdev)
947 {
948 	struct cpcap_charger_ddata *ddata = platform_get_drvdata(pdev);
949 	int error;
950 
951 	atomic_set(&ddata->active, 0);
952 	error = omap_usb2_set_comparator(NULL);
953 	if (error)
954 		dev_warn(ddata->dev, "could not clear USB comparator: %i\n",
955 			 error);
956 
957 	error = cpcap_charger_disable(ddata);
958 	if (error) {
959 		cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_UNKNOWN);
960 		dev_warn(ddata->dev, "could not clear charger: %i\n",
961 			 error);
962 	}
963 	cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_DISCHARGING);
964 	cancel_delayed_work_sync(&ddata->vbus_work);
965 	cancel_delayed_work_sync(&ddata->detect_work);
966 }
967 
968 static int cpcap_charger_remove(struct platform_device *pdev)
969 {
970 	cpcap_charger_shutdown(pdev);
971 
972 	return 0;
973 }
974 
975 static struct platform_driver cpcap_charger_driver = {
976 	.probe = cpcap_charger_probe,
977 	.driver	= {
978 		.name	= "cpcap-charger",
979 		.of_match_table = of_match_ptr(cpcap_charger_id_table),
980 	},
981 	.shutdown = cpcap_charger_shutdown,
982 	.remove	= cpcap_charger_remove,
983 };
984 module_platform_driver(cpcap_charger_driver);
985 
986 MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
987 MODULE_DESCRIPTION("CPCAP Battery Charger Interface driver");
988 MODULE_LICENSE("GPL v2");
989 MODULE_ALIAS("platform:cpcap-charger");
990