1/*
2 * Fuel gauge driver for Maxim 17042 / 8966 / 8997
3 *  Note that Maxim 8966 and 8997 are mfd and this is its subdevice.
4 *
5 * Copyright (C) 2011 Samsung Electronics
6 * MyungJoo Ham <myungjoo.ham@samsung.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
21 *
22 * This driver is based on max17040_battery.c
23 */
24
25#include <linux/init.h>
26#include <linux/module.h>
27#include <linux/slab.h>
28#include <linux/i2c.h>
29#include <linux/delay.h>
30#include <linux/interrupt.h>
31#include <linux/pm.h>
32#include <linux/mod_devicetable.h>
33#include <linux/power_supply.h>
34#include <linux/power/max17042_battery.h>
35#include <linux/of.h>
36#include <linux/regmap.h>
37
38/* Status register bits */
39#define STATUS_POR_BIT         (1 << 1)
40#define STATUS_BST_BIT         (1 << 3)
41#define STATUS_VMN_BIT         (1 << 8)
42#define STATUS_TMN_BIT         (1 << 9)
43#define STATUS_SMN_BIT         (1 << 10)
44#define STATUS_BI_BIT          (1 << 11)
45#define STATUS_VMX_BIT         (1 << 12)
46#define STATUS_TMX_BIT         (1 << 13)
47#define STATUS_SMX_BIT         (1 << 14)
48#define STATUS_BR_BIT          (1 << 15)
49
50/* Interrupt mask bits */
51#define CONFIG_ALRT_BIT_ENBL	(1 << 2)
52#define STATUS_INTR_SOCMIN_BIT	(1 << 10)
53#define STATUS_INTR_SOCMAX_BIT	(1 << 14)
54
55#define VFSOC0_LOCK		0x0000
56#define VFSOC0_UNLOCK		0x0080
57#define MODEL_UNLOCK1	0X0059
58#define MODEL_UNLOCK2	0X00C4
59#define MODEL_LOCK1		0X0000
60#define MODEL_LOCK2		0X0000
61
62#define dQ_ACC_DIV	0x4
63#define dP_ACC_100	0x1900
64#define dP_ACC_200	0x3200
65
66struct max17042_chip {
67	struct i2c_client *client;
68	struct regmap *regmap;
69	struct power_supply *battery;
70	enum max170xx_chip_type chip_type;
71	struct max17042_platform_data *pdata;
72	struct work_struct work;
73	int    init_complete;
74};
75
76static enum power_supply_property max17042_battery_props[] = {
77	POWER_SUPPLY_PROP_PRESENT,
78	POWER_SUPPLY_PROP_CYCLE_COUNT,
79	POWER_SUPPLY_PROP_VOLTAGE_MAX,
80	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
81	POWER_SUPPLY_PROP_VOLTAGE_NOW,
82	POWER_SUPPLY_PROP_VOLTAGE_AVG,
83	POWER_SUPPLY_PROP_VOLTAGE_OCV,
84	POWER_SUPPLY_PROP_CAPACITY,
85	POWER_SUPPLY_PROP_CHARGE_FULL,
86	POWER_SUPPLY_PROP_CHARGE_COUNTER,
87	POWER_SUPPLY_PROP_TEMP,
88	POWER_SUPPLY_PROP_CURRENT_NOW,
89	POWER_SUPPLY_PROP_CURRENT_AVG,
90};
91
92static int max17042_get_property(struct power_supply *psy,
93			    enum power_supply_property psp,
94			    union power_supply_propval *val)
95{
96	struct max17042_chip *chip = power_supply_get_drvdata(psy);
97	struct regmap *map = chip->regmap;
98	int ret;
99	u32 data;
100
101	if (!chip->init_complete)
102		return -EAGAIN;
103
104	switch (psp) {
105	case POWER_SUPPLY_PROP_PRESENT:
106		ret = regmap_read(map, MAX17042_STATUS, &data);
107		if (ret < 0)
108			return ret;
109
110		if (data & MAX17042_STATUS_BattAbsent)
111			val->intval = 0;
112		else
113			val->intval = 1;
114		break;
115	case POWER_SUPPLY_PROP_CYCLE_COUNT:
116		ret = regmap_read(map, MAX17042_Cycles, &data);
117		if (ret < 0)
118			return ret;
119
120		val->intval = data;
121		break;
122	case POWER_SUPPLY_PROP_VOLTAGE_MAX:
123		ret = regmap_read(map, MAX17042_MinMaxVolt, &data);
124		if (ret < 0)
125			return ret;
126
127		val->intval = data >> 8;
128		val->intval *= 20000; /* Units of LSB = 20mV */
129		break;
130	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
131		if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042)
132			ret = regmap_read(map, MAX17042_V_empty, &data);
133		else
134			ret = regmap_read(map, MAX17047_V_empty, &data);
135		if (ret < 0)
136			return ret;
137
138		val->intval = data >> 7;
139		val->intval *= 10000; /* Units of LSB = 10mV */
140		break;
141	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
142		ret = regmap_read(map, MAX17042_VCELL, &data);
143		if (ret < 0)
144			return ret;
145
146		val->intval = data * 625 / 8;
147		break;
148	case POWER_SUPPLY_PROP_VOLTAGE_AVG:
149		ret = regmap_read(map, MAX17042_AvgVCELL, &data);
150		if (ret < 0)
151			return ret;
152
153		val->intval = data * 625 / 8;
154		break;
155	case POWER_SUPPLY_PROP_VOLTAGE_OCV:
156		ret = regmap_read(map, MAX17042_OCVInternal, &data);
157		if (ret < 0)
158			return ret;
159
160		val->intval = data * 625 / 8;
161		break;
162	case POWER_SUPPLY_PROP_CAPACITY:
163		ret = regmap_read(map, MAX17042_RepSOC, &data);
164		if (ret < 0)
165			return ret;
166
167		val->intval = data >> 8;
168		break;
169	case POWER_SUPPLY_PROP_CHARGE_FULL:
170		ret = regmap_read(map, MAX17042_FullCAP, &data);
171		if (ret < 0)
172			return ret;
173
174		val->intval = data * 1000 / 2;
175		break;
176	case POWER_SUPPLY_PROP_CHARGE_COUNTER:
177		ret = regmap_read(map, MAX17042_QH, &data);
178		if (ret < 0)
179			return ret;
180
181		val->intval = data * 1000 / 2;
182		break;
183	case POWER_SUPPLY_PROP_TEMP:
184		ret = regmap_read(map, MAX17042_TEMP, &data);
185		if (ret < 0)
186			return ret;
187
188		val->intval = data;
189		/* The value is signed. */
190		if (val->intval & 0x8000) {
191			val->intval = (0x7fff & ~val->intval) + 1;
192			val->intval *= -1;
193		}
194		/* The value is converted into deci-centigrade scale */
195		/* Units of LSB = 1 / 256 degree Celsius */
196		val->intval = val->intval * 10 / 256;
197		break;
198	case POWER_SUPPLY_PROP_CURRENT_NOW:
199		if (chip->pdata->enable_current_sense) {
200			ret = regmap_read(map, MAX17042_Current, &data);
201			if (ret < 0)
202				return ret;
203
204			val->intval = data;
205			if (val->intval & 0x8000) {
206				/* Negative */
207				val->intval = ~val->intval & 0x7fff;
208				val->intval++;
209				val->intval *= -1;
210			}
211			val->intval *= 1562500 / chip->pdata->r_sns;
212		} else {
213			return -EINVAL;
214		}
215		break;
216	case POWER_SUPPLY_PROP_CURRENT_AVG:
217		if (chip->pdata->enable_current_sense) {
218			ret = regmap_read(map, MAX17042_AvgCurrent, &data);
219			if (ret < 0)
220				return ret;
221
222			val->intval = data;
223			if (val->intval & 0x8000) {
224				/* Negative */
225				val->intval = ~val->intval & 0x7fff;
226				val->intval++;
227				val->intval *= -1;
228			}
229			val->intval *= 1562500 / chip->pdata->r_sns;
230		} else {
231			return -EINVAL;
232		}
233		break;
234	default:
235		return -EINVAL;
236	}
237	return 0;
238}
239
240static int max17042_write_verify_reg(struct regmap *map, u8 reg, u32 value)
241{
242	int retries = 8;
243	int ret;
244	u32 read_value;
245
246	do {
247		ret = regmap_write(map, reg, value);
248		regmap_read(map, reg, &read_value);
249		if (read_value != value) {
250			ret = -EIO;
251			retries--;
252		}
253	} while (retries && read_value != value);
254
255	if (ret < 0)
256		pr_err("%s: err %d\n", __func__, ret);
257
258	return ret;
259}
260
261static inline void max17042_override_por(struct regmap *map,
262					 u8 reg, u16 value)
263{
264	if (value)
265		regmap_write(map, reg, value);
266}
267
268static inline void max10742_unlock_model(struct max17042_chip *chip)
269{
270	struct regmap *map = chip->regmap;
271
272	regmap_write(map, MAX17042_MLOCKReg1, MODEL_UNLOCK1);
273	regmap_write(map, MAX17042_MLOCKReg2, MODEL_UNLOCK2);
274}
275
276static inline void max10742_lock_model(struct max17042_chip *chip)
277{
278	struct regmap *map = chip->regmap;
279
280	regmap_write(map, MAX17042_MLOCKReg1, MODEL_LOCK1);
281	regmap_write(map, MAX17042_MLOCKReg2, MODEL_LOCK2);
282}
283
284static inline void max17042_write_model_data(struct max17042_chip *chip,
285					u8 addr, int size)
286{
287	struct regmap *map = chip->regmap;
288	int i;
289
290	for (i = 0; i < size; i++)
291		regmap_write(map, addr + i,
292			chip->pdata->config_data->cell_char_tbl[i]);
293}
294
295static inline void max17042_read_model_data(struct max17042_chip *chip,
296					u8 addr, u32 *data, int size)
297{
298	struct regmap *map = chip->regmap;
299	int i;
300
301	for (i = 0; i < size; i++)
302		regmap_read(map, addr + i, &data[i]);
303}
304
305static inline int max17042_model_data_compare(struct max17042_chip *chip,
306					u16 *data1, u16 *data2, int size)
307{
308	int i;
309
310	if (memcmp(data1, data2, size)) {
311		dev_err(&chip->client->dev, "%s compare failed\n", __func__);
312		for (i = 0; i < size; i++)
313			dev_info(&chip->client->dev, "0x%x, 0x%x",
314				data1[i], data2[i]);
315		dev_info(&chip->client->dev, "\n");
316		return -EINVAL;
317	}
318	return 0;
319}
320
321static int max17042_init_model(struct max17042_chip *chip)
322{
323	int ret;
324	int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
325	u32 *temp_data;
326
327	temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);
328	if (!temp_data)
329		return -ENOMEM;
330
331	max10742_unlock_model(chip);
332	max17042_write_model_data(chip, MAX17042_MODELChrTbl,
333				table_size);
334	max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
335				table_size);
336
337	ret = max17042_model_data_compare(
338		chip,
339		chip->pdata->config_data->cell_char_tbl,
340		(u16 *)temp_data,
341		table_size);
342
343	max10742_lock_model(chip);
344	kfree(temp_data);
345
346	return ret;
347}
348
349static int max17042_verify_model_lock(struct max17042_chip *chip)
350{
351	int i;
352	int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
353	u32 *temp_data;
354	int ret = 0;
355
356	temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);
357	if (!temp_data)
358		return -ENOMEM;
359
360	max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
361				table_size);
362	for (i = 0; i < table_size; i++)
363		if (temp_data[i])
364			ret = -EINVAL;
365
366	kfree(temp_data);
367	return ret;
368}
369
370static void max17042_write_config_regs(struct max17042_chip *chip)
371{
372	struct max17042_config_data *config = chip->pdata->config_data;
373	struct regmap *map = chip->regmap;
374
375	regmap_write(map, MAX17042_CONFIG, config->config);
376	regmap_write(map, MAX17042_LearnCFG, config->learn_cfg);
377	regmap_write(map, MAX17042_FilterCFG,
378			config->filter_cfg);
379	regmap_write(map, MAX17042_RelaxCFG, config->relax_cfg);
380	if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17047 ||
381			chip->chip_type == MAXIM_DEVICE_TYPE_MAX17050)
382		regmap_write(map, MAX17047_FullSOCThr,
383						config->full_soc_thresh);
384}
385
386static void  max17042_write_custom_regs(struct max17042_chip *chip)
387{
388	struct max17042_config_data *config = chip->pdata->config_data;
389	struct regmap *map = chip->regmap;
390
391	max17042_write_verify_reg(map, MAX17042_RCOMP0, config->rcomp0);
392	max17042_write_verify_reg(map, MAX17042_TempCo,	config->tcompc0);
393	max17042_write_verify_reg(map, MAX17042_ICHGTerm, config->ichgt_term);
394	if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042) {
395		regmap_write(map, MAX17042_EmptyTempCo,	config->empty_tempco);
396		max17042_write_verify_reg(map, MAX17042_K_empty0,
397					config->kempty0);
398	} else {
399		max17042_write_verify_reg(map, MAX17047_QRTbl00,
400						config->qrtbl00);
401		max17042_write_verify_reg(map, MAX17047_QRTbl10,
402						config->qrtbl10);
403		max17042_write_verify_reg(map, MAX17047_QRTbl20,
404						config->qrtbl20);
405		max17042_write_verify_reg(map, MAX17047_QRTbl30,
406						config->qrtbl30);
407	}
408}
409
410static void max17042_update_capacity_regs(struct max17042_chip *chip)
411{
412	struct max17042_config_data *config = chip->pdata->config_data;
413	struct regmap *map = chip->regmap;
414
415	max17042_write_verify_reg(map, MAX17042_FullCAP,
416				config->fullcap);
417	regmap_write(map, MAX17042_DesignCap, config->design_cap);
418	max17042_write_verify_reg(map, MAX17042_FullCAPNom,
419				config->fullcapnom);
420}
421
422static void max17042_reset_vfsoc0_reg(struct max17042_chip *chip)
423{
424	unsigned int vfSoc;
425	struct regmap *map = chip->regmap;
426
427	regmap_read(map, MAX17042_VFSOC, &vfSoc);
428	regmap_write(map, MAX17042_VFSOC0Enable, VFSOC0_UNLOCK);
429	max17042_write_verify_reg(map, MAX17042_VFSOC0, vfSoc);
430	regmap_write(map, MAX17042_VFSOC0Enable, VFSOC0_LOCK);
431}
432
433static void max17042_load_new_capacity_params(struct max17042_chip *chip)
434{
435	u32 full_cap0, rep_cap, dq_acc, vfSoc;
436	u32 rem_cap;
437
438	struct max17042_config_data *config = chip->pdata->config_data;
439	struct regmap *map = chip->regmap;
440
441	regmap_read(map, MAX17042_FullCAP0, &full_cap0);
442	regmap_read(map, MAX17042_VFSOC, &vfSoc);
443
444	/* fg_vfSoc needs to shifted by 8 bits to get the
445	 * perc in 1% accuracy, to get the right rem_cap multiply
446	 * full_cap0, fg_vfSoc and devide by 100
447	 */
448	rem_cap = ((vfSoc >> 8) * full_cap0) / 100;
449	max17042_write_verify_reg(map, MAX17042_RemCap, rem_cap);
450
451	rep_cap = rem_cap;
452	max17042_write_verify_reg(map, MAX17042_RepCap, rep_cap);
453
454	/* Write dQ_acc to 200% of Capacity and dP_acc to 200% */
455	dq_acc = config->fullcap / dQ_ACC_DIV;
456	max17042_write_verify_reg(map, MAX17042_dQacc, dq_acc);
457	max17042_write_verify_reg(map, MAX17042_dPacc, dP_ACC_200);
458
459	max17042_write_verify_reg(map, MAX17042_FullCAP,
460			config->fullcap);
461	regmap_write(map, MAX17042_DesignCap,
462			config->design_cap);
463	max17042_write_verify_reg(map, MAX17042_FullCAPNom,
464			config->fullcapnom);
465	/* Update SOC register with new SOC */
466	regmap_write(map, MAX17042_RepSOC, vfSoc);
467}
468
469/*
470 * Block write all the override values coming from platform data.
471 * This function MUST be called before the POR initialization proceedure
472 * specified by maxim.
473 */
474static inline void max17042_override_por_values(struct max17042_chip *chip)
475{
476	struct regmap *map = chip->regmap;
477	struct max17042_config_data *config = chip->pdata->config_data;
478
479	max17042_override_por(map, MAX17042_TGAIN, config->tgain);
480	max17042_override_por(map, MAx17042_TOFF, config->toff);
481	max17042_override_por(map, MAX17042_CGAIN, config->cgain);
482	max17042_override_por(map, MAX17042_COFF, config->coff);
483
484	max17042_override_por(map, MAX17042_VALRT_Th, config->valrt_thresh);
485	max17042_override_por(map, MAX17042_TALRT_Th, config->talrt_thresh);
486	max17042_override_por(map, MAX17042_SALRT_Th,
487						config->soc_alrt_thresh);
488	max17042_override_por(map, MAX17042_CONFIG, config->config);
489	max17042_override_por(map, MAX17042_SHDNTIMER, config->shdntimer);
490
491	max17042_override_por(map, MAX17042_DesignCap, config->design_cap);
492	max17042_override_por(map, MAX17042_ICHGTerm, config->ichgt_term);
493
494	max17042_override_por(map, MAX17042_AtRate, config->at_rate);
495	max17042_override_por(map, MAX17042_LearnCFG, config->learn_cfg);
496	max17042_override_por(map, MAX17042_FilterCFG, config->filter_cfg);
497	max17042_override_por(map, MAX17042_RelaxCFG, config->relax_cfg);
498	max17042_override_por(map, MAX17042_MiscCFG, config->misc_cfg);
499	max17042_override_por(map, MAX17042_MaskSOC, config->masksoc);
500
501	max17042_override_por(map, MAX17042_FullCAP, config->fullcap);
502	max17042_override_por(map, MAX17042_FullCAPNom, config->fullcapnom);
503	if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042)
504		max17042_override_por(map, MAX17042_SOC_empty,
505						config->socempty);
506	max17042_override_por(map, MAX17042_LAvg_empty, config->lavg_empty);
507	max17042_override_por(map, MAX17042_dQacc, config->dqacc);
508	max17042_override_por(map, MAX17042_dPacc, config->dpacc);
509
510	if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042)
511		max17042_override_por(map, MAX17042_V_empty, config->vempty);
512	else
513		max17042_override_por(map, MAX17047_V_empty, config->vempty);
514	max17042_override_por(map, MAX17042_TempNom, config->temp_nom);
515	max17042_override_por(map, MAX17042_TempLim, config->temp_lim);
516	max17042_override_por(map, MAX17042_FCTC, config->fctc);
517	max17042_override_por(map, MAX17042_RCOMP0, config->rcomp0);
518	max17042_override_por(map, MAX17042_TempCo, config->tcompc0);
519	if (chip->chip_type) {
520		max17042_override_por(map, MAX17042_EmptyTempCo,
521						config->empty_tempco);
522		max17042_override_por(map, MAX17042_K_empty0,
523						config->kempty0);
524	}
525}
526
527static int max17042_init_chip(struct max17042_chip *chip)
528{
529	struct regmap *map = chip->regmap;
530	int ret;
531
532	max17042_override_por_values(chip);
533	/* After Power up, the MAX17042 requires 500mS in order
534	 * to perform signal debouncing and initial SOC reporting
535	 */
536	msleep(500);
537
538	/* Initialize configaration */
539	max17042_write_config_regs(chip);
540
541	/* write cell characterization data */
542	ret = max17042_init_model(chip);
543	if (ret) {
544		dev_err(&chip->client->dev, "%s init failed\n",
545			__func__);
546		return -EIO;
547	}
548
549	ret = max17042_verify_model_lock(chip);
550	if (ret) {
551		dev_err(&chip->client->dev, "%s lock verify failed\n",
552			__func__);
553		return -EIO;
554	}
555	/* write custom parameters */
556	max17042_write_custom_regs(chip);
557
558	/* update capacity params */
559	max17042_update_capacity_regs(chip);
560
561	/* delay must be atleast 350mS to allow VFSOC
562	 * to be calculated from the new configuration
563	 */
564	msleep(350);
565
566	/* reset vfsoc0 reg */
567	max17042_reset_vfsoc0_reg(chip);
568
569	/* load new capacity params */
570	max17042_load_new_capacity_params(chip);
571
572	/* Init complete, Clear the POR bit */
573	regmap_update_bits(map, MAX17042_STATUS, STATUS_POR_BIT, 0x0);
574	return 0;
575}
576
577static void max17042_set_soc_threshold(struct max17042_chip *chip, u16 off)
578{
579	struct regmap *map = chip->regmap;
580	u32 soc, soc_tr;
581
582	/* program interrupt thesholds such that we should
583	 * get interrupt for every 'off' perc change in the soc
584	 */
585	regmap_read(map, MAX17042_RepSOC, &soc);
586	soc >>= 8;
587	soc_tr = (soc + off) << 8;
588	soc_tr |= (soc - off);
589	regmap_write(map, MAX17042_SALRT_Th, soc_tr);
590}
591
592static irqreturn_t max17042_thread_handler(int id, void *dev)
593{
594	struct max17042_chip *chip = dev;
595	u32 val;
596
597	regmap_read(chip->regmap, MAX17042_STATUS, &val);
598	if ((val & STATUS_INTR_SOCMIN_BIT) ||
599		(val & STATUS_INTR_SOCMAX_BIT)) {
600		dev_info(&chip->client->dev, "SOC threshold INTR\n");
601		max17042_set_soc_threshold(chip, 1);
602	}
603
604	power_supply_changed(chip->battery);
605	return IRQ_HANDLED;
606}
607
608static void max17042_init_worker(struct work_struct *work)
609{
610	struct max17042_chip *chip = container_of(work,
611				struct max17042_chip, work);
612	int ret;
613
614	/* Initialize registers according to values from the platform data */
615	if (chip->pdata->enable_por_init && chip->pdata->config_data) {
616		ret = max17042_init_chip(chip);
617		if (ret)
618			return;
619	}
620
621	chip->init_complete = 1;
622}
623
624#ifdef CONFIG_OF
625static struct max17042_platform_data *
626max17042_get_pdata(struct device *dev)
627{
628	struct device_node *np = dev->of_node;
629	u32 prop;
630	struct max17042_platform_data *pdata;
631
632	if (!np)
633		return dev->platform_data;
634
635	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
636	if (!pdata)
637		return NULL;
638
639	/*
640	 * Require current sense resistor value to be specified for
641	 * current-sense functionality to be enabled at all.
642	 */
643	if (of_property_read_u32(np, "maxim,rsns-microohm", &prop) == 0) {
644		pdata->r_sns = prop;
645		pdata->enable_current_sense = true;
646	}
647
648	return pdata;
649}
650#else
651static struct max17042_platform_data *
652max17042_get_pdata(struct device *dev)
653{
654	return dev->platform_data;
655}
656#endif
657
658static const struct regmap_config max17042_regmap_config = {
659	.reg_bits = 8,
660	.val_bits = 16,
661	.val_format_endian = REGMAP_ENDIAN_NATIVE,
662};
663
664static const struct power_supply_desc max17042_psy_desc = {
665	.name		= "max170xx_battery",
666	.type		= POWER_SUPPLY_TYPE_BATTERY,
667	.get_property	= max17042_get_property,
668	.properties	= max17042_battery_props,
669	.num_properties	= ARRAY_SIZE(max17042_battery_props),
670};
671
672static const struct power_supply_desc max17042_no_current_sense_psy_desc = {
673	.name		= "max170xx_battery",
674	.type		= POWER_SUPPLY_TYPE_BATTERY,
675	.get_property	= max17042_get_property,
676	.properties	= max17042_battery_props,
677	.num_properties	= ARRAY_SIZE(max17042_battery_props) - 2,
678};
679
680static int max17042_probe(struct i2c_client *client,
681			const struct i2c_device_id *id)
682{
683	struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
684	const struct power_supply_desc *max17042_desc = &max17042_psy_desc;
685	struct power_supply_config psy_cfg = {};
686	struct max17042_chip *chip;
687	int ret;
688	int i;
689	u32 val;
690
691	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
692		return -EIO;
693
694	chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
695	if (!chip)
696		return -ENOMEM;
697
698	chip->client = client;
699	chip->regmap = devm_regmap_init_i2c(client, &max17042_regmap_config);
700	if (IS_ERR(chip->regmap)) {
701		dev_err(&client->dev, "Failed to initialize regmap\n");
702		return -EINVAL;
703	}
704
705	chip->pdata = max17042_get_pdata(&client->dev);
706	if (!chip->pdata) {
707		dev_err(&client->dev, "no platform data provided\n");
708		return -EINVAL;
709	}
710
711	i2c_set_clientdata(client, chip);
712	chip->chip_type = id->driver_data;
713	psy_cfg.drv_data = chip;
714
715	/* When current is not measured,
716	 * CURRENT_NOW and CURRENT_AVG properties should be invisible. */
717	if (!chip->pdata->enable_current_sense)
718		max17042_desc = &max17042_no_current_sense_psy_desc;
719
720	if (chip->pdata->r_sns == 0)
721		chip->pdata->r_sns = MAX17042_DEFAULT_SNS_RESISTOR;
722
723	if (chip->pdata->init_data)
724		for (i = 0; i < chip->pdata->num_init_data; i++)
725			regmap_write(chip->regmap,
726					chip->pdata->init_data[i].addr,
727					chip->pdata->init_data[i].data);
728
729	if (!chip->pdata->enable_current_sense) {
730		regmap_write(chip->regmap, MAX17042_CGAIN, 0x0000);
731		regmap_write(chip->regmap, MAX17042_MiscCFG, 0x0003);
732		regmap_write(chip->regmap, MAX17042_LearnCFG, 0x0007);
733	}
734
735	chip->battery = power_supply_register(&client->dev, max17042_desc,
736						&psy_cfg);
737	if (IS_ERR(chip->battery)) {
738		dev_err(&client->dev, "failed: power supply register\n");
739		return PTR_ERR(chip->battery);
740	}
741
742	if (client->irq) {
743		ret = request_threaded_irq(client->irq, NULL,
744					max17042_thread_handler,
745					IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
746					chip->battery->desc->name, chip);
747		if (!ret) {
748			regmap_update_bits(chip->regmap, MAX17042_CONFIG,
749					CONFIG_ALRT_BIT_ENBL,
750					CONFIG_ALRT_BIT_ENBL);
751			max17042_set_soc_threshold(chip, 1);
752		} else {
753			client->irq = 0;
754			dev_err(&client->dev, "%s(): cannot get IRQ\n",
755				__func__);
756		}
757	}
758
759	regmap_read(chip->regmap, MAX17042_STATUS, &val);
760	if (val & STATUS_POR_BIT) {
761		INIT_WORK(&chip->work, max17042_init_worker);
762		schedule_work(&chip->work);
763	} else {
764		chip->init_complete = 1;
765	}
766
767	return 0;
768}
769
770static int max17042_remove(struct i2c_client *client)
771{
772	struct max17042_chip *chip = i2c_get_clientdata(client);
773
774	if (client->irq)
775		free_irq(client->irq, chip);
776	power_supply_unregister(chip->battery);
777	return 0;
778}
779
780#ifdef CONFIG_PM_SLEEP
781static int max17042_suspend(struct device *dev)
782{
783	struct max17042_chip *chip = dev_get_drvdata(dev);
784
785	/*
786	 * disable the irq and enable irq_wake
787	 * capability to the interrupt line.
788	 */
789	if (chip->client->irq) {
790		disable_irq(chip->client->irq);
791		enable_irq_wake(chip->client->irq);
792	}
793
794	return 0;
795}
796
797static int max17042_resume(struct device *dev)
798{
799	struct max17042_chip *chip = dev_get_drvdata(dev);
800
801	if (chip->client->irq) {
802		disable_irq_wake(chip->client->irq);
803		enable_irq(chip->client->irq);
804		/* re-program the SOC thresholds to 1% change */
805		max17042_set_soc_threshold(chip, 1);
806	}
807
808	return 0;
809}
810#endif
811
812static SIMPLE_DEV_PM_OPS(max17042_pm_ops, max17042_suspend,
813			max17042_resume);
814
815#ifdef CONFIG_OF
816static const struct of_device_id max17042_dt_match[] = {
817	{ .compatible = "maxim,max17042" },
818	{ .compatible = "maxim,max17047" },
819	{ .compatible = "maxim,max17050" },
820	{ },
821};
822MODULE_DEVICE_TABLE(of, max17042_dt_match);
823#endif
824
825static const struct i2c_device_id max17042_id[] = {
826	{ "max17042", MAXIM_DEVICE_TYPE_MAX17042 },
827	{ "max17047", MAXIM_DEVICE_TYPE_MAX17047 },
828	{ "max17050", MAXIM_DEVICE_TYPE_MAX17050 },
829	{ }
830};
831MODULE_DEVICE_TABLE(i2c, max17042_id);
832
833static struct i2c_driver max17042_i2c_driver = {
834	.driver	= {
835		.name	= "max17042",
836		.of_match_table = of_match_ptr(max17042_dt_match),
837		.pm	= &max17042_pm_ops,
838	},
839	.probe		= max17042_probe,
840	.remove		= max17042_remove,
841	.id_table	= max17042_id,
842};
843module_i2c_driver(max17042_i2c_driver);
844
845MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
846MODULE_DESCRIPTION("MAX17042 Fuel Gauge");
847MODULE_LICENSE("GPL");
848