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 
55 enum 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 
69 enum lp8788_charger_adc_sel {
70 	LP8788_VBATT,
71 	LP8788_BATT_TEMP,
72 	LP8788_NUM_CHG_ADC,
73 };
74 
75 enum 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  */
85 struct 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  */
102 struct 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 
113 static char *battery_supplied_to[] = {
114 	LP8788_BATTERY_NAME,
115 };
116 
117 static enum power_supply_property lp8788_charger_prop[] = {
118 	POWER_SUPPLY_PROP_ONLINE,
119 	POWER_SUPPLY_PROP_CURRENT_MAX,
120 };
121 
122 static 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 
lp8788_is_charger_detected(struct lp8788_charger * pchg)133 static 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 
lp8788_charger_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)143 static 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 
lp8788_get_battery_status(struct lp8788_charger * pchg,union power_supply_propval * val)166 static 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 
lp8788_get_battery_health(struct lp8788_charger * pchg,union power_supply_propval * val)199 static 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 
lp8788_get_battery_present(struct lp8788_charger * pchg,union power_supply_propval * val)219 static 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 
lp8788_get_vbatt_adc(struct lp8788_charger * pchg,int * result)233 static 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 
lp8788_get_battery_voltage(struct lp8788_charger * pchg,union power_supply_propval * val)243 static 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 
lp8788_get_battery_capacity(struct lp8788_charger * pchg,union power_supply_propval * val)249 static 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 
lp8788_get_battery_temperature(struct lp8788_charger * pchg,union power_supply_propval * val)287 static 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 
lp8788_get_battery_charging_current(struct lp8788_charger * pchg,union power_supply_propval * val)307 static 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 
lp8788_get_charging_termination_voltage(struct lp8788_charger * pchg,union power_supply_propval * val)320 static 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 
lp8788_battery_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)332 static 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 
lp8788_is_valid_charger_register(u8 addr)360 static inline bool lp8788_is_valid_charger_register(u8 addr)
361 {
362 	return addr >= LP8788_CHG_START && addr <= LP8788_CHG_END;
363 }
364 
lp8788_update_charger_params(struct platform_device * pdev,struct lp8788_charger * pchg)365 static 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 
393 static 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 
401 static 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 
lp8788_psy_unregister(struct lp8788_charger * pchg)409 static void lp8788_psy_unregister(struct lp8788_charger *pchg)
410 {
411 	power_supply_unregister(pchg->battery);
412 	power_supply_unregister(pchg->charger);
413 }
414 
lp8788_charger_event(struct work_struct * work)415 static void lp8788_charger_event(struct work_struct *work)
416 {
417 	struct lp8788_charger *pchg =
418 		container_of(work, struct lp8788_charger, charger_work);
419 	struct lp8788_charger_platform_data *pdata = pchg->pdata;
420 	enum lp8788_charger_event event = lp8788_is_charger_detected(pchg);
421 
422 	pdata->charger_event(pchg->lp, event);
423 }
424 
lp8788_find_irq_id(struct lp8788_charger * pchg,int virq,int * id)425 static bool lp8788_find_irq_id(struct lp8788_charger *pchg, int virq, int *id)
426 {
427 	bool found = false;
428 	int i;
429 
430 	for (i = 0; i < pchg->num_irqs; i++) {
431 		if (pchg->irqs[i].virq == virq) {
432 			*id = pchg->irqs[i].which;
433 			found = true;
434 			break;
435 		}
436 	}
437 
438 	return found;
439 }
440 
lp8788_charger_irq_thread(int virq,void * ptr)441 static irqreturn_t lp8788_charger_irq_thread(int virq, void *ptr)
442 {
443 	struct lp8788_charger *pchg = ptr;
444 	struct lp8788_charger_platform_data *pdata = pchg->pdata;
445 	int id = -1;
446 
447 	if (!lp8788_find_irq_id(pchg, virq, &id))
448 		return IRQ_NONE;
449 
450 	switch (id) {
451 	case LP8788_INT_CHG_INPUT_STATE:
452 	case LP8788_INT_CHG_STATE:
453 	case LP8788_INT_EOC:
454 	case LP8788_INT_BATT_LOW:
455 	case LP8788_INT_NO_BATT:
456 		power_supply_changed(pchg->charger);
457 		power_supply_changed(pchg->battery);
458 		break;
459 	default:
460 		break;
461 	}
462 
463 	/* report charger dectection event if used */
464 	if (!pdata)
465 		goto irq_handled;
466 
467 	if (pdata->charger_event && id == LP8788_INT_CHG_INPUT_STATE)
468 		schedule_work(&pchg->charger_work);
469 
470 irq_handled:
471 	return IRQ_HANDLED;
472 }
473 
lp8788_set_irqs(struct platform_device * pdev,struct lp8788_charger * pchg,const char * name)474 static int lp8788_set_irqs(struct platform_device *pdev,
475 			struct lp8788_charger *pchg, const char *name)
476 {
477 	struct resource *r;
478 	struct irq_domain *irqdm = pchg->lp->irqdm;
479 	int irq_start;
480 	int irq_end;
481 	int virq;
482 	int nr_irq;
483 	int i;
484 	int ret;
485 
486 	/* no error even if no irq resource */
487 	r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, name);
488 	if (!r)
489 		return 0;
490 
491 	irq_start = r->start;
492 	irq_end = r->end;
493 
494 	for (i = irq_start; i <= irq_end; i++) {
495 		nr_irq = pchg->num_irqs;
496 
497 		virq = irq_create_mapping(irqdm, i);
498 		pchg->irqs[nr_irq].virq = virq;
499 		pchg->irqs[nr_irq].which = i;
500 		pchg->num_irqs++;
501 
502 		ret = request_threaded_irq(virq, NULL,
503 					lp8788_charger_irq_thread,
504 					IRQF_ONESHOT, name, pchg);
505 		if (ret)
506 			break;
507 	}
508 
509 	if (i <= irq_end)
510 		goto err_free_irq;
511 
512 	return 0;
513 
514 err_free_irq:
515 	for (i = 0; i < pchg->num_irqs; i++)
516 		free_irq(pchg->irqs[i].virq, pchg);
517 	return ret;
518 }
519 
lp8788_irq_register(struct platform_device * pdev,struct lp8788_charger * pchg)520 static int lp8788_irq_register(struct platform_device *pdev,
521 				struct lp8788_charger *pchg)
522 {
523 	static const char * const name[] = {
524 		LP8788_CHG_IRQ, LP8788_PRSW_IRQ, LP8788_BATT_IRQ
525 	};
526 	int i;
527 	int ret;
528 
529 	INIT_WORK(&pchg->charger_work, lp8788_charger_event);
530 	pchg->num_irqs = 0;
531 
532 	for (i = 0; i < ARRAY_SIZE(name); i++) {
533 		ret = lp8788_set_irqs(pdev, pchg, name[i]);
534 		if (ret) {
535 			dev_warn(&pdev->dev, "irq setup failed: %s\n", name[i]);
536 			return ret;
537 		}
538 	}
539 
540 	if (pchg->num_irqs > LP8788_MAX_CHG_IRQS) {
541 		dev_err(&pdev->dev, "invalid total number of irqs: %d\n",
542 			pchg->num_irqs);
543 		return -EINVAL;
544 	}
545 
546 
547 	return 0;
548 }
549 
lp8788_irq_unregister(struct platform_device * pdev,struct lp8788_charger * pchg)550 static void lp8788_irq_unregister(struct platform_device *pdev,
551 				  struct lp8788_charger *pchg)
552 {
553 	int i;
554 	int irq;
555 
556 	for (i = 0; i < pchg->num_irqs; i++) {
557 		irq = pchg->irqs[i].virq;
558 		if (!irq)
559 			continue;
560 
561 		free_irq(irq, pchg);
562 	}
563 }
564 
lp8788_setup_adc_channel(struct device * dev,struct lp8788_charger * pchg)565 static void lp8788_setup_adc_channel(struct device *dev,
566 				struct lp8788_charger *pchg)
567 {
568 	struct lp8788_charger_platform_data *pdata = pchg->pdata;
569 	struct iio_channel *chan;
570 
571 	if (!pdata)
572 		return;
573 
574 	/* ADC channel for battery voltage */
575 	chan = devm_iio_channel_get(dev, pdata->adc_vbatt);
576 	pchg->chan[LP8788_VBATT] = IS_ERR(chan) ? NULL : chan;
577 
578 	/* ADC channel for battery temperature */
579 	chan = devm_iio_channel_get(dev, pdata->adc_batt_temp);
580 	pchg->chan[LP8788_BATT_TEMP] = IS_ERR(chan) ? NULL : chan;
581 }
582 
lp8788_show_charger_status(struct device * dev,struct device_attribute * attr,char * buf)583 static ssize_t lp8788_show_charger_status(struct device *dev,
584 				struct device_attribute *attr, char *buf)
585 {
586 	struct lp8788_charger *pchg = dev_get_drvdata(dev);
587 	enum lp8788_charging_state state;
588 	static const char * const desc[LP8788_MAX_CHG_STATE] = {
589 		[LP8788_OFF] = "CHARGER OFF",
590 		[LP8788_WARM_UP] = "WARM UP",
591 		[LP8788_LOW_INPUT] = "LOW INPUT STATE",
592 		[LP8788_PRECHARGE] = "CHARGING - PRECHARGE",
593 		[LP8788_CC] = "CHARGING - CC",
594 		[LP8788_CV] = "CHARGING - CV",
595 		[LP8788_MAINTENANCE] = "NO CHARGING - MAINTENANCE",
596 		[LP8788_BATTERY_FAULT] = "BATTERY FAULT",
597 		[LP8788_SYSTEM_SUPPORT] = "SYSTEM SUPPORT",
598 		[LP8788_HIGH_CURRENT] = "HIGH CURRENT",
599 	};
600 	u8 data;
601 
602 	lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
603 	state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;
604 
605 	return sysfs_emit(buf, "%s\n", desc[state]);
606 }
607 
lp8788_show_eoc_time(struct device * dev,struct device_attribute * attr,char * buf)608 static ssize_t lp8788_show_eoc_time(struct device *dev,
609 				struct device_attribute *attr, char *buf)
610 {
611 	struct lp8788_charger *pchg = dev_get_drvdata(dev);
612 	static const char * const stime[] = {
613 		"400ms", "5min", "10min", "15min",
614 		"20min", "25min", "30min", "No timeout"
615 	};
616 	u8 val;
617 
618 	lp8788_read_byte(pchg->lp, LP8788_CHG_EOC, &val);
619 	val = (val & LP8788_CHG_EOC_TIME_M) >> LP8788_CHG_EOC_TIME_S;
620 
621 	return sysfs_emit(buf, "End Of Charge Time: %s\n", stime[val]);
622 }
623 
lp8788_show_eoc_level(struct device * dev,struct device_attribute * attr,char * buf)624 static ssize_t lp8788_show_eoc_level(struct device *dev,
625 				struct device_attribute *attr, char *buf)
626 {
627 	struct lp8788_charger *pchg = dev_get_drvdata(dev);
628 	static const char * const abs_level[] = {
629 			"25mA", "49mA", "75mA", "98mA"
630 	};
631 	static const char * const relative_level[] = {
632 			"5%", "10%", "15%", "20%"
633 	};
634 	const char *level;
635 	u8 val;
636 	u8 mode;
637 
638 	lp8788_read_byte(pchg->lp, LP8788_CHG_EOC, &val);
639 
640 	mode = val & LP8788_CHG_EOC_MODE_M;
641 	val = (val & LP8788_CHG_EOC_LEVEL_M) >> LP8788_CHG_EOC_LEVEL_S;
642 	level = mode ? abs_level[val] : relative_level[val];
643 
644 	return sysfs_emit(buf, "End Of Charge Level: %s\n", level);
645 }
646 
647 static DEVICE_ATTR(charger_status, S_IRUSR, lp8788_show_charger_status, NULL);
648 static DEVICE_ATTR(eoc_time, S_IRUSR, lp8788_show_eoc_time, NULL);
649 static DEVICE_ATTR(eoc_level, S_IRUSR, lp8788_show_eoc_level, NULL);
650 
651 static struct attribute *lp8788_charger_sysfs_attrs[] = {
652 	&dev_attr_charger_status.attr,
653 	&dev_attr_eoc_time.attr,
654 	&dev_attr_eoc_level.attr,
655 	NULL,
656 };
657 
658 ATTRIBUTE_GROUPS(lp8788_charger_sysfs);
659 
lp8788_psy_register(struct platform_device * pdev,struct lp8788_charger * pchg)660 static int lp8788_psy_register(struct platform_device *pdev,
661 				struct lp8788_charger *pchg)
662 {
663 	struct power_supply_config charger_cfg = {};
664 
665 	charger_cfg.attr_grp = lp8788_charger_sysfs_groups;
666 	charger_cfg.supplied_to = battery_supplied_to;
667 	charger_cfg.num_supplicants = ARRAY_SIZE(battery_supplied_to);
668 
669 	pchg->charger = power_supply_register(&pdev->dev,
670 					      &lp8788_psy_charger_desc,
671 					      &charger_cfg);
672 	if (IS_ERR(pchg->charger))
673 		return -EPERM;
674 
675 	pchg->battery = power_supply_register(&pdev->dev,
676 					      &lp8788_psy_battery_desc, NULL);
677 	if (IS_ERR(pchg->battery)) {
678 		power_supply_unregister(pchg->charger);
679 		return -EPERM;
680 	}
681 
682 	return 0;
683 }
684 
lp8788_charger_probe(struct platform_device * pdev)685 static int lp8788_charger_probe(struct platform_device *pdev)
686 {
687 	struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent);
688 	struct lp8788_charger *pchg;
689 	struct device *dev = &pdev->dev;
690 	int ret;
691 
692 	pchg = devm_kzalloc(dev, sizeof(struct lp8788_charger), GFP_KERNEL);
693 	if (!pchg)
694 		return -ENOMEM;
695 
696 	pchg->lp = lp;
697 	pchg->pdata = lp->pdata ? lp->pdata->chg_pdata : NULL;
698 	platform_set_drvdata(pdev, pchg);
699 
700 	ret = lp8788_update_charger_params(pdev, pchg);
701 	if (ret)
702 		return ret;
703 
704 	lp8788_setup_adc_channel(&pdev->dev, pchg);
705 
706 	ret = lp8788_psy_register(pdev, pchg);
707 	if (ret)
708 		return ret;
709 
710 	ret = lp8788_irq_register(pdev, pchg);
711 	if (ret)
712 		dev_warn(dev, "failed to register charger irq: %d\n", ret);
713 
714 	return 0;
715 }
716 
lp8788_charger_remove(struct platform_device * pdev)717 static int lp8788_charger_remove(struct platform_device *pdev)
718 {
719 	struct lp8788_charger *pchg = platform_get_drvdata(pdev);
720 
721 	flush_work(&pchg->charger_work);
722 	lp8788_irq_unregister(pdev, pchg);
723 	lp8788_psy_unregister(pchg);
724 
725 	return 0;
726 }
727 
728 static struct platform_driver lp8788_charger_driver = {
729 	.probe = lp8788_charger_probe,
730 	.remove = lp8788_charger_remove,
731 	.driver = {
732 		.name = LP8788_DEV_CHARGER,
733 	},
734 };
735 module_platform_driver(lp8788_charger_driver);
736 
737 MODULE_DESCRIPTION("TI LP8788 Charger Driver");
738 MODULE_AUTHOR("Milo Kim");
739 MODULE_LICENSE("GPL");
740 MODULE_ALIAS("platform:lp8788-charger");
741