lp8788-charger.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * TI LP8788 MFD - battery charger driver
  4 *
  5 * Copyright 2012 Texas Instruments
  6 *
  7 * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
  8 */
  9
 10#include <linux/err.h>
 11#include <linux/iio/consumer.h>
 12#include <linux/interrupt.h>
 13#include <linux/irqdomain.h>
 14#include <linux/mfd/lp8788.h>
 15#include <linux/module.h>
 16#include <linux/platform_device.h>
 17#include <linux/power_supply.h>
 18#include <linux/slab.h>
 19#include <linux/workqueue.h>
 20
 21/* register address */
 22#define LP8788_CHG_STATUS		0x07
 23#define LP8788_CHG_IDCIN		0x13
 24#define LP8788_CHG_IBATT		0x14
 25#define LP8788_CHG_VTERM		0x15
 26#define LP8788_CHG_EOC			0x16
 27
 28/* mask/shift bits */
 29#define LP8788_CHG_INPUT_STATE_M	0x03	/* Addr 07h */
 30#define LP8788_CHG_STATE_M		0x3C
 31#define LP8788_CHG_STATE_S		2
 32#define LP8788_NO_BATT_M		BIT(6)
 33#define LP8788_BAD_BATT_M		BIT(7)
 34#define LP8788_CHG_IBATT_M		0x1F	/* Addr 14h */
 35#define LP8788_CHG_VTERM_M		0x0F	/* Addr 15h */
 36#define LP8788_CHG_EOC_LEVEL_M		0x30	/* Addr 16h */
 37#define LP8788_CHG_EOC_LEVEL_S		4
 38#define LP8788_CHG_EOC_TIME_M		0x0E
 39#define LP8788_CHG_EOC_TIME_S		1
 40#define LP8788_CHG_EOC_MODE_M		BIT(0)
 41
 42#define LP8788_CHARGER_NAME		"charger"
 43#define LP8788_BATTERY_NAME		"main_batt"
 44
 45#define LP8788_CHG_START		0x11
 46#define LP8788_CHG_END			0x1C
 47
 48#define LP8788_ISEL_MAX			23
 49#define LP8788_ISEL_STEP		50
 50#define LP8788_VTERM_MIN		4100
 51#define LP8788_VTERM_STEP		25
 52#define LP8788_MAX_BATT_CAPACITY	100
 53#define LP8788_MAX_CHG_IRQS		11
 54
 55enum lp8788_charging_state {
 56	LP8788_OFF,
 57	LP8788_WARM_UP,
 58	LP8788_LOW_INPUT = 0x3,
 59	LP8788_PRECHARGE,
 60	LP8788_CC,
 61	LP8788_CV,
 62	LP8788_MAINTENANCE,
 63	LP8788_BATTERY_FAULT,
 64	LP8788_SYSTEM_SUPPORT = 0xC,
 65	LP8788_HIGH_CURRENT = 0xF,
 66	LP8788_MAX_CHG_STATE,
 67};
 68
 69enum lp8788_charger_adc_sel {
 70	LP8788_VBATT,
 71	LP8788_BATT_TEMP,
 72	LP8788_NUM_CHG_ADC,
 73};
 74
 75enum lp8788_charger_input_state {
 76	LP8788_SYSTEM_SUPPLY = 1,
 77	LP8788_FULL_FUNCTION,
 78};
 79
 80/*
 81 * struct lp8788_chg_irq
 82 * @which        : lp8788 interrupt id
 83 * @virq         : Linux IRQ number from irq_domain
 84 */
 85struct lp8788_chg_irq {
 86	enum lp8788_int_id which;
 87	int virq;
 88};
 89
 90/*
 91 * struct lp8788_charger
 92 * @lp           : used for accessing the registers of mfd lp8788 device
 93 * @charger      : power supply driver for the battery charger
 94 * @battery      : power supply driver for the battery
 95 * @charger_work : work queue for charger input interrupts
 96 * @chan         : iio channels for getting adc values
 97 *                 eg) battery voltage, capacity and temperature
 98 * @irqs         : charger dedicated interrupts
 99 * @num_irqs     : total numbers of charger interrupts
100 * @pdata        : charger platform specific data
101 */
102struct lp8788_charger {
103	struct lp8788 *lp;
104	struct power_supply *charger;
105	struct power_supply *battery;
106	struct work_struct charger_work;
107	struct iio_channel *chan[LP8788_NUM_CHG_ADC];
108	struct lp8788_chg_irq irqs[LP8788_MAX_CHG_IRQS];
109	int num_irqs;
110	struct lp8788_charger_platform_data *pdata;
111};
112
113static char *battery_supplied_to[] = {
114	LP8788_BATTERY_NAME,
115};
116
117static enum power_supply_property lp8788_charger_prop[] = {
118	POWER_SUPPLY_PROP_ONLINE,
119	POWER_SUPPLY_PROP_CURRENT_MAX,
120};
121
122static enum power_supply_property lp8788_battery_prop[] = {
123	POWER_SUPPLY_PROP_STATUS,
124	POWER_SUPPLY_PROP_HEALTH,
125	POWER_SUPPLY_PROP_PRESENT,
126	POWER_SUPPLY_PROP_VOLTAGE_NOW,
127	POWER_SUPPLY_PROP_CAPACITY,
128	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
129	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
130	POWER_SUPPLY_PROP_TEMP,
131};
132
133static bool lp8788_is_charger_detected(struct lp8788_charger *pchg)
134{
135	u8 data;
136
137	lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
138	data &= LP8788_CHG_INPUT_STATE_M;
139
140	return data == LP8788_SYSTEM_SUPPLY || data == LP8788_FULL_FUNCTION;
141}
142
143static int lp8788_charger_get_property(struct power_supply *psy,
144					enum power_supply_property psp,
145					union power_supply_propval *val)
146{
147	struct lp8788_charger *pchg = dev_get_drvdata(psy->dev.parent);
148	u8 read;
149
150	switch (psp) {
151	case POWER_SUPPLY_PROP_ONLINE:
152		val->intval = lp8788_is_charger_detected(pchg);
153		break;
154	case POWER_SUPPLY_PROP_CURRENT_MAX:
155		lp8788_read_byte(pchg->lp, LP8788_CHG_IDCIN, &read);
156		val->intval = LP8788_ISEL_STEP *
157				(min_t(int, read, LP8788_ISEL_MAX) + 1);
158		break;
159	default:
160		return -EINVAL;
161	}
162
163	return 0;
164}
165
166static int lp8788_get_battery_status(struct lp8788_charger *pchg,
167				union power_supply_propval *val)
168{
169	enum lp8788_charging_state state;
170	u8 data;
171	int ret;
172
173	ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
174	if (ret)
175		return ret;
176
177	state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;
178	switch (state) {
179	case LP8788_OFF:
180		val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
181		break;
182	case LP8788_PRECHARGE:
183	case LP8788_CC:
184	case LP8788_CV:
185	case LP8788_HIGH_CURRENT:
186		val->intval = POWER_SUPPLY_STATUS_CHARGING;
187		break;
188	case LP8788_MAINTENANCE:
189		val->intval = POWER_SUPPLY_STATUS_FULL;
190		break;
191	default:
192		val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
193		break;
194	}
195
196	return 0;
197}
198
199static int lp8788_get_battery_health(struct lp8788_charger *pchg,
200				union power_supply_propval *val)
201{
202	u8 data;
203	int ret;
204
205	ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
206	if (ret)
207		return ret;
208
209	if (data & LP8788_NO_BATT_M)
210		val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
211	else if (data & LP8788_BAD_BATT_M)
212		val->intval = POWER_SUPPLY_HEALTH_DEAD;
213	else
214		val->intval = POWER_SUPPLY_HEALTH_GOOD;
215
216	return 0;
217}
218
219static int lp8788_get_battery_present(struct lp8788_charger *pchg,
220				union power_supply_propval *val)
221{
222	u8 data;
223	int ret;
224
225	ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
226	if (ret)
227		return ret;
228
229	val->intval = !(data & LP8788_NO_BATT_M);
230	return 0;
231}
232
233static int lp8788_get_vbatt_adc(struct lp8788_charger *pchg, int *result)
234{
235	struct iio_channel *channel = pchg->chan[LP8788_VBATT];
236
237	if (!channel)
238		return -EINVAL;
239
240	return iio_read_channel_processed(channel, result);
241}
242
243static int lp8788_get_battery_voltage(struct lp8788_charger *pchg,
244				union power_supply_propval *val)
245{
246	return lp8788_get_vbatt_adc(pchg, &val->intval);
247}
248
249static int lp8788_get_battery_capacity(struct lp8788_charger *pchg,
250				union power_supply_propval *val)
251{
252	struct lp8788 *lp = pchg->lp;
253	struct lp8788_charger_platform_data *pdata = pchg->pdata;
254	unsigned int max_vbatt;
255	int vbatt;
256	enum lp8788_charging_state state;
257	u8 data;
258	int ret;
259
260	if (!pdata)
261		return -EINVAL;
262
263	max_vbatt = pdata->max_vbatt_mv;
264	if (max_vbatt == 0)
265		return -EINVAL;
266
267	ret = lp8788_read_byte(lp, LP8788_CHG_STATUS, &data);
268	if (ret)
269		return ret;
270
271	state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;
272
273	if (state == LP8788_MAINTENANCE) {
274		val->intval = LP8788_MAX_BATT_CAPACITY;
275	} else {
276		ret = lp8788_get_vbatt_adc(pchg, &vbatt);
277		if (ret)
278			return ret;
279
280		val->intval = (vbatt * LP8788_MAX_BATT_CAPACITY) / max_vbatt;
281		val->intval = min(val->intval, LP8788_MAX_BATT_CAPACITY);
282	}
283
284	return 0;
285}
286
287static int lp8788_get_battery_temperature(struct lp8788_charger *pchg,
288				union power_supply_propval *val)
289{
290	struct iio_channel *channel = pchg->chan[LP8788_BATT_TEMP];
291	int result;
292	int ret;
293
294	if (!channel)
295		return -EINVAL;
296
297	ret = iio_read_channel_processed(channel, &result);
298	if (ret < 0)
299		return -EINVAL;
300
301	/* unit: 0.1 'C */
302	val->intval = result * 10;
303
304	return 0;
305}
306
307static int lp8788_get_battery_charging_current(struct lp8788_charger *pchg,
308				union power_supply_propval *val)
309{
310	u8 read;
311
312	lp8788_read_byte(pchg->lp, LP8788_CHG_IBATT, &read);
313	read &= LP8788_CHG_IBATT_M;
314	val->intval = LP8788_ISEL_STEP *
315			(min_t(int, read, LP8788_ISEL_MAX) + 1);
316
317	return 0;
318}
319
320static int lp8788_get_charging_termination_voltage(struct lp8788_charger *pchg,
321				union power_supply_propval *val)
322{
323	u8 read;
324
325	lp8788_read_byte(pchg->lp, LP8788_CHG_VTERM, &read);
326	read &= LP8788_CHG_VTERM_M;
327	val->intval = LP8788_VTERM_MIN + LP8788_VTERM_STEP * read;
328
329	return 0;
330}
331
332static int lp8788_battery_get_property(struct power_supply *psy,
333					enum power_supply_property psp,
334					union power_supply_propval *val)
335{
336	struct lp8788_charger *pchg = dev_get_drvdata(psy->dev.parent);
337
338	switch (psp) {
339	case POWER_SUPPLY_PROP_STATUS:
340		return lp8788_get_battery_status(pchg, val);
341	case POWER_SUPPLY_PROP_HEALTH:
342		return lp8788_get_battery_health(pchg, val);
343	case POWER_SUPPLY_PROP_PRESENT:
344		return lp8788_get_battery_present(pchg, val);
345	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
346		return lp8788_get_battery_voltage(pchg, val);
347	case POWER_SUPPLY_PROP_CAPACITY:
348		return lp8788_get_battery_capacity(pchg, val);
349	case POWER_SUPPLY_PROP_TEMP:
350		return lp8788_get_battery_temperature(pchg, val);
351	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
352		return lp8788_get_battery_charging_current(pchg, val);
353	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
354		return lp8788_get_charging_termination_voltage(pchg, val);
355	default:
356		return -EINVAL;
357	}
358}
359
360static inline bool lp8788_is_valid_charger_register(u8 addr)
361{
362	return addr >= LP8788_CHG_START && addr <= LP8788_CHG_END;
363}
364
365static int lp8788_update_charger_params(struct platform_device *pdev,
366					struct lp8788_charger *pchg)
367{
368	struct lp8788 *lp = pchg->lp;
369	struct lp8788_charger_platform_data *pdata = pchg->pdata;
370	struct lp8788_chg_param *param;
371	int i;
372	int ret;
373
374	if (!pdata || !pdata->chg_params) {
375		dev_info(&pdev->dev, "skip updating charger parameters\n");
376		return 0;
377	}
378
379	/* setting charging parameters */
380	for (i = 0; i < pdata->num_chg_params; i++) {
381		param = pdata->chg_params + i;
382
383		if (lp8788_is_valid_charger_register(param->addr)) {
384			ret = lp8788_write_byte(lp, param->addr, param->val);
385			if (ret)
386				return ret;
387		}
388	}
389
390	return 0;
391}
392
393static const struct power_supply_desc lp8788_psy_charger_desc = {
394	.name		= LP8788_CHARGER_NAME,
395	.type		= POWER_SUPPLY_TYPE_MAINS,
396	.properties	= lp8788_charger_prop,
397	.num_properties	= ARRAY_SIZE(lp8788_charger_prop),
398	.get_property	= lp8788_charger_get_property,
399};
400
401static const struct power_supply_desc lp8788_psy_battery_desc = {
402	.name		= LP8788_BATTERY_NAME,
403	.type		= POWER_SUPPLY_TYPE_BATTERY,
404	.properties	= lp8788_battery_prop,
405	.num_properties	= ARRAY_SIZE(lp8788_battery_prop),
406	.get_property	= lp8788_battery_get_property,
407};
408
409static void lp8788_charger_event(struct work_struct *work)
410{
411	struct lp8788_charger *pchg =
412		container_of(work, struct lp8788_charger, charger_work);
413	struct lp8788_charger_platform_data *pdata = pchg->pdata;
414	enum lp8788_charger_event event = lp8788_is_charger_detected(pchg);
415
416	pdata->charger_event(pchg->lp, event);
417}
418
419static bool lp8788_find_irq_id(struct lp8788_charger *pchg, int virq, int *id)
420{
421	bool found = false;
422	int i;
423
424	for (i = 0; i < pchg->num_irqs; i++) {
425		if (pchg->irqs[i].virq == virq) {
426			*id = pchg->irqs[i].which;
427			found = true;
428			break;
429		}
430	}
431
432	return found;
433}
434
435static irqreturn_t lp8788_charger_irq_thread(int virq, void *ptr)
436{
437	struct lp8788_charger *pchg = ptr;
438	struct lp8788_charger_platform_data *pdata = pchg->pdata;
439	int id = -1;
440
441	if (!lp8788_find_irq_id(pchg, virq, &id))
442		return IRQ_NONE;
443
444	switch (id) {
445	case LP8788_INT_CHG_INPUT_STATE:
446	case LP8788_INT_CHG_STATE:
447	case LP8788_INT_EOC:
448	case LP8788_INT_BATT_LOW:
449	case LP8788_INT_NO_BATT:
450		power_supply_changed(pchg->charger);
451		power_supply_changed(pchg->battery);
452		break;
453	default:
454		break;
455	}
456
457	/* report charger dectection event if used */
458	if (!pdata)
459		goto irq_handled;
460
461	if (pdata->charger_event && id == LP8788_INT_CHG_INPUT_STATE)
462		schedule_work(&pchg->charger_work);
463
464irq_handled:
465	return IRQ_HANDLED;
466}
467
468static int lp8788_set_irqs(struct platform_device *pdev,
469			struct lp8788_charger *pchg, const char *name)
470{
471	struct resource *r;
472	struct irq_domain *irqdm = pchg->lp->irqdm;
473	int irq_start;
474	int irq_end;
475	int virq;
476	int nr_irq;
477	int i;
478	int ret;
479
480	/* no error even if no irq resource */
481	r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, name);
482	if (!r)
483		return 0;
484
485	irq_start = r->start;
486	irq_end = r->end;
487
488	for (i = irq_start; i <= irq_end; i++) {
489		nr_irq = pchg->num_irqs;
490
491		virq = irq_create_mapping(irqdm, i);
492		pchg->irqs[nr_irq].virq = virq;
493		pchg->irqs[nr_irq].which = i;
494		pchg->num_irqs++;
495
496		ret = request_threaded_irq(virq, NULL,
497					lp8788_charger_irq_thread,
498					IRQF_ONESHOT, name, pchg);
499		if (ret)
500			break;
501	}
502
503	if (i <= irq_end)
504		goto err_free_irq;
505
506	return 0;
507
508err_free_irq:
509	for (i = 0; i < pchg->num_irqs; i++)
510		free_irq(pchg->irqs[i].virq, pchg);
511	return ret;
512}
513
514static int lp8788_irq_register(struct platform_device *pdev,
515				struct lp8788_charger *pchg)
516{
517	static const char * const name[] = {
518		LP8788_CHG_IRQ, LP8788_PRSW_IRQ, LP8788_BATT_IRQ
519	};
520	int i;
521	int ret;
522
523	INIT_WORK(&pchg->charger_work, lp8788_charger_event);
524	pchg->num_irqs = 0;
525
526	for (i = 0; i < ARRAY_SIZE(name); i++) {
527		ret = lp8788_set_irqs(pdev, pchg, name[i]);
528		if (ret) {
529			dev_warn(&pdev->dev, "irq setup failed: %s\n", name[i]);
530			return ret;
531		}
532	}
533
534	if (pchg->num_irqs > LP8788_MAX_CHG_IRQS) {
535		dev_err(&pdev->dev, "invalid total number of irqs: %d\n",
536			pchg->num_irqs);
537		return -EINVAL;
538	}
539
540
541	return 0;
542}
543
544static void lp8788_irq_unregister(struct platform_device *pdev,
545				  struct lp8788_charger *pchg)
546{
547	int i;
548	int irq;
549
550	for (i = 0; i < pchg->num_irqs; i++) {
551		irq = pchg->irqs[i].virq;
552		if (!irq)
553			continue;
554
555		free_irq(irq, pchg);
556	}
557}
558
559static void lp8788_setup_adc_channel(struct device *dev,
560				struct lp8788_charger *pchg)
561{
562	struct lp8788_charger_platform_data *pdata = pchg->pdata;
563	struct iio_channel *chan;
564
565	if (!pdata)
566		return;
567
568	/* ADC channel for battery voltage */
569	chan = devm_iio_channel_get(dev, pdata->adc_vbatt);
570	pchg->chan[LP8788_VBATT] = IS_ERR(chan) ? NULL : chan;
571
572	/* ADC channel for battery temperature */
573	chan = devm_iio_channel_get(dev, pdata->adc_batt_temp);
574	pchg->chan[LP8788_BATT_TEMP] = IS_ERR(chan) ? NULL : chan;
575}
576
577static ssize_t lp8788_show_charger_status(struct device *dev,
578				struct device_attribute *attr, char *buf)
579{
580	struct lp8788_charger *pchg = dev_get_drvdata(dev);
581	enum lp8788_charging_state state;
582	static const char * const desc[LP8788_MAX_CHG_STATE] = {
583		[LP8788_OFF] = "CHARGER OFF",
584		[LP8788_WARM_UP] = "WARM UP",
585		[LP8788_LOW_INPUT] = "LOW INPUT STATE",
586		[LP8788_PRECHARGE] = "CHARGING - PRECHARGE",
587		[LP8788_CC] = "CHARGING - CC",
588		[LP8788_CV] = "CHARGING - CV",
589		[LP8788_MAINTENANCE] = "NO CHARGING - MAINTENANCE",
590		[LP8788_BATTERY_FAULT] = "BATTERY FAULT",
591		[LP8788_SYSTEM_SUPPORT] = "SYSTEM SUPPORT",
592		[LP8788_HIGH_CURRENT] = "HIGH CURRENT",
593	};
594	u8 data;
595
596	lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
597	state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;
598
599	return sysfs_emit(buf, "%s\n", desc[state]);
600}
601
602static ssize_t lp8788_show_eoc_time(struct device *dev,
603				struct device_attribute *attr, char *buf)
604{
605	struct lp8788_charger *pchg = dev_get_drvdata(dev);
606	static const char * const stime[] = {
607		"400ms", "5min", "10min", "15min",
608		"20min", "25min", "30min", "No timeout"
609	};
610	u8 val;
611
612	lp8788_read_byte(pchg->lp, LP8788_CHG_EOC, &val);
613	val = (val & LP8788_CHG_EOC_TIME_M) >> LP8788_CHG_EOC_TIME_S;
614
615	return sysfs_emit(buf, "End Of Charge Time: %s\n", stime[val]);
616}
617
618static ssize_t lp8788_show_eoc_level(struct device *dev,
619				struct device_attribute *attr, char *buf)
620{
621	struct lp8788_charger *pchg = dev_get_drvdata(dev);
622	static const char * const abs_level[] = {
623			"25mA", "49mA", "75mA", "98mA"
624	};
625	static const char * const relative_level[] = {
626			"5%", "10%", "15%", "20%"
627	};
628	const char *level;
629	u8 val;
630	u8 mode;
631
632	lp8788_read_byte(pchg->lp, LP8788_CHG_EOC, &val);
633
634	mode = val & LP8788_CHG_EOC_MODE_M;
635	val = (val & LP8788_CHG_EOC_LEVEL_M) >> LP8788_CHG_EOC_LEVEL_S;
636	level = mode ? abs_level[val] : relative_level[val];
637
638	return sysfs_emit(buf, "End Of Charge Level: %s\n", level);
639}
640
641static DEVICE_ATTR(charger_status, S_IRUSR, lp8788_show_charger_status, NULL);
642static DEVICE_ATTR(eoc_time, S_IRUSR, lp8788_show_eoc_time, NULL);
643static DEVICE_ATTR(eoc_level, S_IRUSR, lp8788_show_eoc_level, NULL);
644
645static struct attribute *lp8788_charger_sysfs_attrs[] = {
646	&dev_attr_charger_status.attr,
647	&dev_attr_eoc_time.attr,
648	&dev_attr_eoc_level.attr,
649	NULL,
650};
651
652ATTRIBUTE_GROUPS(lp8788_charger_sysfs);
653
654static int lp8788_psy_register(struct platform_device *pdev,
655				struct lp8788_charger *pchg)
656{
657	struct power_supply_config charger_cfg = {};
658
659	charger_cfg.attr_grp = lp8788_charger_sysfs_groups;
660	charger_cfg.supplied_to = battery_supplied_to;
661	charger_cfg.num_supplicants = ARRAY_SIZE(battery_supplied_to);
662
663	pchg->charger = devm_power_supply_register(&pdev->dev,
664						   &lp8788_psy_charger_desc,
665						   &charger_cfg);
666	if (IS_ERR(pchg->charger))
667		return -EPERM;
668
669	pchg->battery = devm_power_supply_register(&pdev->dev,
670						   &lp8788_psy_battery_desc, NULL);
671	if (IS_ERR(pchg->battery))
672		return -EPERM;
673
674	return 0;
675}
676
677static int lp8788_charger_probe(struct platform_device *pdev)
678{
679	struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent);
680	struct lp8788_charger *pchg;
681	struct device *dev = &pdev->dev;
682	int ret;
683
684	pchg = devm_kzalloc(dev, sizeof(struct lp8788_charger), GFP_KERNEL);
685	if (!pchg)
686		return -ENOMEM;
687
688	pchg->lp = lp;
689	pchg->pdata = lp->pdata ? lp->pdata->chg_pdata : NULL;
690	platform_set_drvdata(pdev, pchg);
691
692	ret = lp8788_update_charger_params(pdev, pchg);
693	if (ret)
694		return ret;
695
696	lp8788_setup_adc_channel(&pdev->dev, pchg);
697
698	ret = lp8788_psy_register(pdev, pchg);
699	if (ret)
700		return ret;
701
702	ret = lp8788_irq_register(pdev, pchg);
703	if (ret)
704		dev_warn(dev, "failed to register charger irq: %d\n", ret);
705
706	return 0;
707}
708
709static void lp8788_charger_remove(struct platform_device *pdev)
710{
711	struct lp8788_charger *pchg = platform_get_drvdata(pdev);
712
713	flush_work(&pchg->charger_work);
714	lp8788_irq_unregister(pdev, pchg);
715}
716
717static struct platform_driver lp8788_charger_driver = {
718	.probe = lp8788_charger_probe,
719	.remove = lp8788_charger_remove,
720	.driver = {
721		.name = LP8788_DEV_CHARGER,
722	},
723};
724module_platform_driver(lp8788_charger_driver);
725
726MODULE_DESCRIPTION("TI LP8788 Charger Driver");
727MODULE_AUTHOR("Milo Kim");
728MODULE_LICENSE("GPL");
729MODULE_ALIAS("platform:lp8788-charger");