cpcap-charger.c

  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 * 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/string_choices.h>
 18#include <linux/err.h>
 19#include <linux/interrupt.h>
 20#include <linux/notifier.h>
 21#include <linux/mod_devicetable.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
116enum {
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
125struct 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
147struct cpcap_interrupt_desc {
148	int irq;
149	struct list_head node;
150	const char *name;
151};
152
153struct 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
167static 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
176static 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
192static 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
208static 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
248static 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
271static int
272cpcap_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
293static 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
313static 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
342static 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
354static 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
363static 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
372static 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
405static 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
418static 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
443static 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 */
459static 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
516out_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		str_enable_disable(ddata->vbus_enabled), error);
520}
521
522static 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
537static 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
569static 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
595static 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
621static 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 (!battery) {
693			dev_err(ddata->dev, "battery power_supply not available\n");
694			return;
695		}
696
697		error = power_supply_get_property(battery, POWER_SUPPLY_PROP_PRESENT, &val);
698		power_supply_put(battery);
699		if (error)
700			goto out_err;
701
702		if (val.intval) {
703			max_current = 1596000;
704		} else {
705			dev_info(ddata->dev, "battery not inserted, charging disabled\n");
706			max_current = 0;
707		}
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
732out_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
737static 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
749static 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
782static 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
793static 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
807static 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
822static 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
845out_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
853static char *cpcap_charger_supplied_to[] = {
854	"battery",
855};
856
857static 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
867static const struct of_device_id cpcap_charger_id_table[] = {
868	{
869		.compatible = "motorola,mapphone-cpcap-charger",
870	},
871	{},
872};
873MODULE_DEVICE_TABLE(of, cpcap_charger_id_table);
874
875static int cpcap_charger_probe(struct platform_device *pdev)
876{
877	struct cpcap_charger_ddata *ddata;
878	struct power_supply_config psy_cfg = {};
879	int error;
880
881	ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
882	if (!ddata)
883		return -ENOMEM;
884
885	ddata->dev = &pdev->dev;
886	ddata->voltage = 4200000;
887	ddata->limit_current = 532000;
888
889	ddata->reg = dev_get_regmap(ddata->dev->parent, NULL);
890	if (!ddata->reg)
891		return -ENODEV;
892
893	INIT_LIST_HEAD(&ddata->irq_list);
894	INIT_DELAYED_WORK(&ddata->detect_work, cpcap_usb_detect);
895	INIT_DELAYED_WORK(&ddata->vbus_work, cpcap_charger_vbus_work);
896	platform_set_drvdata(pdev, ddata);
897
898	error = cpcap_charger_init_iio(ddata);
899	if (error)
900		return error;
901
902	atomic_set(&ddata->active, 1);
903
904	psy_cfg.fwnode = dev_fwnode(&pdev->dev);
905	psy_cfg.drv_data = ddata;
906	psy_cfg.supplied_to = cpcap_charger_supplied_to;
907	psy_cfg.num_supplicants = ARRAY_SIZE(cpcap_charger_supplied_to);
908
909	ddata->usb = devm_power_supply_register(ddata->dev,
910						&cpcap_charger_usb_desc,
911						&psy_cfg);
912	if (IS_ERR(ddata->usb)) {
913		error = PTR_ERR(ddata->usb);
914		dev_err(ddata->dev, "failed to register USB charger: %i\n",
915			error);
916
917		return error;
918	}
919
920	error = cpcap_usb_init_interrupts(pdev, ddata);
921	if (error)
922		return error;
923
924	ddata->comparator.set_vbus = cpcap_charger_set_vbus;
925	error = omap_usb2_set_comparator(&ddata->comparator);
926	if (error == -ENODEV) {
927		dev_info(ddata->dev, "charger needs phy, deferring probe\n");
928		return -EPROBE_DEFER;
929	}
930
931	cpcap_charger_init_optional_gpios(ddata);
932
933	schedule_delayed_work(&ddata->detect_work, 0);
934
935	return 0;
936}
937
938static void cpcap_charger_shutdown(struct platform_device *pdev)
939{
940	struct cpcap_charger_ddata *ddata = platform_get_drvdata(pdev);
941	int error;
942
943	atomic_set(&ddata->active, 0);
944	error = omap_usb2_set_comparator(NULL);
945	if (error)
946		dev_warn(ddata->dev, "could not clear USB comparator: %i\n",
947			 error);
948
949	error = cpcap_charger_disable(ddata);
950	if (error) {
951		cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_UNKNOWN);
952		dev_warn(ddata->dev, "could not clear charger: %i\n",
953			 error);
954	}
955	cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_DISCHARGING);
956	cancel_delayed_work_sync(&ddata->vbus_work);
957	cancel_delayed_work_sync(&ddata->detect_work);
958}
959
960static void cpcap_charger_remove(struct platform_device *pdev)
961{
962	cpcap_charger_shutdown(pdev);
963}
964
965static struct platform_driver cpcap_charger_driver = {
966	.probe = cpcap_charger_probe,
967	.driver	= {
968		.name	= "cpcap-charger",
969		.of_match_table = cpcap_charger_id_table,
970	},
971	.shutdown = cpcap_charger_shutdown,
972	.remove = cpcap_charger_remove,
973};
974module_platform_driver(cpcap_charger_driver);
975
976MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
977MODULE_DESCRIPTION("CPCAP Battery Charger Interface driver");
978MODULE_LICENSE("GPL v2");
979MODULE_ALIAS("platform:cpcap-charger");