1 /*
2  * axp288_fuel_gauge.c - Xpower AXP288 PMIC Fuel Gauge Driver
3  *
4  * Copyright (C) 2014 Intel Corporation
5  *
6  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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; version 2 of the License.
11  *
12  * This program is distributed in the hope that it will be useful, but
13  * WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	See the GNU
15  * General Public License for more details.
16  *
17  */
18 
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/device.h>
22 #include <linux/regmap.h>
23 #include <linux/jiffies.h>
24 #include <linux/interrupt.h>
25 #include <linux/workqueue.h>
26 #include <linux/mfd/axp20x.h>
27 #include <linux/platform_device.h>
28 #include <linux/power_supply.h>
29 #include <linux/iio/consumer.h>
30 #include <linux/debugfs.h>
31 #include <linux/seq_file.h>
32 
33 #define CHRG_STAT_BAT_SAFE_MODE		(1 << 3)
34 #define CHRG_STAT_BAT_VALID			(1 << 4)
35 #define CHRG_STAT_BAT_PRESENT		(1 << 5)
36 #define CHRG_STAT_CHARGING			(1 << 6)
37 #define CHRG_STAT_PMIC_OTP			(1 << 7)
38 
39 #define CHRG_CCCV_CC_MASK			0xf     /* 4 bits */
40 #define CHRG_CCCV_CC_BIT_POS		0
41 #define CHRG_CCCV_CC_OFFSET			200     /* 200mA */
42 #define CHRG_CCCV_CC_LSB_RES		200     /* 200mA */
43 #define CHRG_CCCV_ITERM_20P			(1 << 4)    /* 20% of CC */
44 #define CHRG_CCCV_CV_MASK			0x60        /* 2 bits */
45 #define CHRG_CCCV_CV_BIT_POS		5
46 #define CHRG_CCCV_CV_4100MV			0x0     /* 4.10V */
47 #define CHRG_CCCV_CV_4150MV			0x1     /* 4.15V */
48 #define CHRG_CCCV_CV_4200MV			0x2     /* 4.20V */
49 #define CHRG_CCCV_CV_4350MV			0x3     /* 4.35V */
50 #define CHRG_CCCV_CHG_EN			(1 << 7)
51 
52 #define CV_4100						4100    /* 4100mV */
53 #define CV_4150						4150    /* 4150mV */
54 #define CV_4200						4200    /* 4200mV */
55 #define CV_4350						4350    /* 4350mV */
56 
57 #define TEMP_IRQ_CFG_QWBTU			(1 << 0)
58 #define TEMP_IRQ_CFG_WBTU			(1 << 1)
59 #define TEMP_IRQ_CFG_QWBTO			(1 << 2)
60 #define TEMP_IRQ_CFG_WBTO			(1 << 3)
61 #define TEMP_IRQ_CFG_MASK			0xf
62 
63 #define FG_IRQ_CFG_LOWBATT_WL2		(1 << 0)
64 #define FG_IRQ_CFG_LOWBATT_WL1		(1 << 1)
65 #define FG_IRQ_CFG_LOWBATT_MASK		0x3
66 #define LOWBAT_IRQ_STAT_LOWBATT_WL2	(1 << 0)
67 #define LOWBAT_IRQ_STAT_LOWBATT_WL1	(1 << 1)
68 
69 #define FG_CNTL_OCV_ADJ_STAT		(1 << 2)
70 #define FG_CNTL_OCV_ADJ_EN			(1 << 3)
71 #define FG_CNTL_CAP_ADJ_STAT		(1 << 4)
72 #define FG_CNTL_CAP_ADJ_EN			(1 << 5)
73 #define FG_CNTL_CC_EN				(1 << 6)
74 #define FG_CNTL_GAUGE_EN			(1 << 7)
75 
76 #define FG_REP_CAP_VALID			(1 << 7)
77 #define FG_REP_CAP_VAL_MASK			0x7F
78 
79 #define FG_DES_CAP1_VALID			(1 << 7)
80 #define FG_DES_CAP1_VAL_MASK		0x7F
81 #define FG_DES_CAP0_VAL_MASK		0xFF
82 #define FG_DES_CAP_RES_LSB			1456    /* 1.456mAhr */
83 
84 #define FG_CC_MTR1_VALID			(1 << 7)
85 #define FG_CC_MTR1_VAL_MASK			0x7F
86 #define FG_CC_MTR0_VAL_MASK			0xFF
87 #define FG_DES_CC_RES_LSB			1456    /* 1.456mAhr */
88 
89 #define FG_OCV_CAP_VALID			(1 << 7)
90 #define FG_OCV_CAP_VAL_MASK			0x7F
91 #define FG_CC_CAP_VALID				(1 << 7)
92 #define FG_CC_CAP_VAL_MASK			0x7F
93 
94 #define FG_LOW_CAP_THR1_MASK		0xf0    /* 5% tp 20% */
95 #define FG_LOW_CAP_THR1_VAL			0xa0    /* 15 perc */
96 #define FG_LOW_CAP_THR2_MASK		0x0f    /* 0% to 15% */
97 #define FG_LOW_CAP_WARN_THR			14  /* 14 perc */
98 #define FG_LOW_CAP_CRIT_THR			4   /* 4 perc */
99 #define FG_LOW_CAP_SHDN_THR			0   /* 0 perc */
100 
101 #define STATUS_MON_DELAY_JIFFIES    (HZ * 60)   /*60 sec */
102 #define NR_RETRY_CNT    3
103 #define DEV_NAME	"axp288_fuel_gauge"
104 
105 /* 1.1mV per LSB expressed in uV */
106 #define VOLTAGE_FROM_ADC(a)			((a * 11) / 10)
107 /* properties converted to tenths of degrees, uV, uA, uW */
108 #define PROP_TEMP(a)		((a) * 10)
109 #define UNPROP_TEMP(a)		((a) / 10)
110 #define PROP_VOLT(a)		((a) * 1000)
111 #define PROP_CURR(a)		((a) * 1000)
112 
113 #define AXP288_FG_INTR_NUM	6
114 enum {
115 	QWBTU_IRQ = 0,
116 	WBTU_IRQ,
117 	QWBTO_IRQ,
118 	WBTO_IRQ,
119 	WL2_IRQ,
120 	WL1_IRQ,
121 };
122 
123 struct axp288_fg_info {
124 	struct platform_device *pdev;
125 	struct axp20x_fg_pdata *pdata;
126 	struct regmap *regmap;
127 	struct regmap_irq_chip_data *regmap_irqc;
128 	int irq[AXP288_FG_INTR_NUM];
129 	struct power_supply *bat;
130 	struct mutex lock;
131 	int status;
132 	struct delayed_work status_monitor;
133 	struct dentry *debug_file;
134 };
135 
136 static enum power_supply_property fuel_gauge_props[] = {
137 	POWER_SUPPLY_PROP_STATUS,
138 	POWER_SUPPLY_PROP_PRESENT,
139 	POWER_SUPPLY_PROP_HEALTH,
140 	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
141 	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
142 	POWER_SUPPLY_PROP_VOLTAGE_NOW,
143 	POWER_SUPPLY_PROP_VOLTAGE_OCV,
144 	POWER_SUPPLY_PROP_CURRENT_NOW,
145 	POWER_SUPPLY_PROP_CAPACITY,
146 	POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN,
147 	POWER_SUPPLY_PROP_TEMP,
148 	POWER_SUPPLY_PROP_TEMP_MAX,
149 	POWER_SUPPLY_PROP_TEMP_MIN,
150 	POWER_SUPPLY_PROP_TEMP_ALERT_MIN,
151 	POWER_SUPPLY_PROP_TEMP_ALERT_MAX,
152 	POWER_SUPPLY_PROP_TECHNOLOGY,
153 	POWER_SUPPLY_PROP_CHARGE_FULL,
154 	POWER_SUPPLY_PROP_CHARGE_NOW,
155 	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
156 	POWER_SUPPLY_PROP_MODEL_NAME,
157 };
158 
159 static int fuel_gauge_reg_readb(struct axp288_fg_info *info, int reg)
160 {
161 	int ret, i;
162 	unsigned int val;
163 
164 	for (i = 0; i < NR_RETRY_CNT; i++) {
165 		ret = regmap_read(info->regmap, reg, &val);
166 		if (ret == -EBUSY)
167 			continue;
168 		else
169 			break;
170 	}
171 
172 	if (ret < 0)
173 		dev_err(&info->pdev->dev, "axp288 reg read err:%d\n", ret);
174 
175 	return val;
176 }
177 
178 static int fuel_gauge_reg_writeb(struct axp288_fg_info *info, int reg, u8 val)
179 {
180 	int ret;
181 
182 	ret = regmap_write(info->regmap, reg, (unsigned int)val);
183 
184 	if (ret < 0)
185 		dev_err(&info->pdev->dev, "axp288 reg write err:%d\n", ret);
186 
187 	return ret;
188 }
189 
190 static int pmic_read_adc_val(const char *name, int *raw_val,
191 		struct axp288_fg_info *info)
192 {
193 	int ret, val = 0;
194 	struct iio_channel *indio_chan;
195 
196 	indio_chan = iio_channel_get(NULL, name);
197 	if (IS_ERR_OR_NULL(indio_chan)) {
198 		ret = PTR_ERR(indio_chan);
199 		goto exit;
200 	}
201 	ret = iio_read_channel_raw(indio_chan, &val);
202 	if (ret < 0) {
203 		dev_err(&info->pdev->dev,
204 			"IIO channel read error: %x, %x\n", ret, val);
205 		goto err_exit;
206 	}
207 
208 	dev_dbg(&info->pdev->dev, "adc raw val=%x\n", val);
209 	*raw_val = val;
210 
211 err_exit:
212 	iio_channel_release(indio_chan);
213 exit:
214 	return ret;
215 }
216 
217 #ifdef CONFIG_DEBUG_FS
218 static int fuel_gauge_debug_show(struct seq_file *s, void *data)
219 {
220 	struct axp288_fg_info *info = s->private;
221 	int raw_val, ret;
222 
223 	seq_printf(s, " PWR_STATUS[%02x] : %02x\n",
224 		AXP20X_PWR_INPUT_STATUS,
225 		fuel_gauge_reg_readb(info, AXP20X_PWR_INPUT_STATUS));
226 	seq_printf(s, "PWR_OP_MODE[%02x] : %02x\n",
227 		AXP20X_PWR_OP_MODE,
228 		fuel_gauge_reg_readb(info, AXP20X_PWR_OP_MODE));
229 	seq_printf(s, " CHRG_CTRL1[%02x] : %02x\n",
230 		AXP20X_CHRG_CTRL1,
231 		fuel_gauge_reg_readb(info, AXP20X_CHRG_CTRL1));
232 	seq_printf(s, "       VLTF[%02x] : %02x\n",
233 		AXP20X_V_LTF_DISCHRG,
234 		fuel_gauge_reg_readb(info, AXP20X_V_LTF_DISCHRG));
235 	seq_printf(s, "       VHTF[%02x] : %02x\n",
236 		AXP20X_V_HTF_DISCHRG,
237 		fuel_gauge_reg_readb(info, AXP20X_V_HTF_DISCHRG));
238 	seq_printf(s, "    CC_CTRL[%02x] : %02x\n",
239 		AXP20X_CC_CTRL,
240 		fuel_gauge_reg_readb(info, AXP20X_CC_CTRL));
241 	seq_printf(s, "BATTERY CAP[%02x] : %02x\n",
242 		AXP20X_FG_RES,
243 		fuel_gauge_reg_readb(info, AXP20X_FG_RES));
244 	seq_printf(s, "    FG_RDC1[%02x] : %02x\n",
245 		AXP288_FG_RDC1_REG,
246 		fuel_gauge_reg_readb(info, AXP288_FG_RDC1_REG));
247 	seq_printf(s, "    FG_RDC0[%02x] : %02x\n",
248 		AXP288_FG_RDC0_REG,
249 		fuel_gauge_reg_readb(info, AXP288_FG_RDC0_REG));
250 	seq_printf(s, "    FG_OCVH[%02x] : %02x\n",
251 		AXP288_FG_OCVH_REG,
252 		fuel_gauge_reg_readb(info, AXP288_FG_OCVH_REG));
253 	seq_printf(s, "    FG_OCVL[%02x] : %02x\n",
254 		AXP288_FG_OCVL_REG,
255 		fuel_gauge_reg_readb(info, AXP288_FG_OCVL_REG));
256 	seq_printf(s, "FG_DES_CAP1[%02x] : %02x\n",
257 		AXP288_FG_DES_CAP1_REG,
258 		fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP1_REG));
259 	seq_printf(s, "FG_DES_CAP0[%02x] : %02x\n",
260 		AXP288_FG_DES_CAP0_REG,
261 		fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP0_REG));
262 	seq_printf(s, " FG_CC_MTR1[%02x] : %02x\n",
263 		AXP288_FG_CC_MTR1_REG,
264 		fuel_gauge_reg_readb(info, AXP288_FG_CC_MTR1_REG));
265 	seq_printf(s, " FG_CC_MTR0[%02x] : %02x\n",
266 		AXP288_FG_CC_MTR0_REG,
267 		fuel_gauge_reg_readb(info, AXP288_FG_CC_MTR0_REG));
268 	seq_printf(s, " FG_OCV_CAP[%02x] : %02x\n",
269 		AXP288_FG_OCV_CAP_REG,
270 		fuel_gauge_reg_readb(info, AXP288_FG_OCV_CAP_REG));
271 	seq_printf(s, "  FG_CC_CAP[%02x] : %02x\n",
272 		AXP288_FG_CC_CAP_REG,
273 		fuel_gauge_reg_readb(info, AXP288_FG_CC_CAP_REG));
274 	seq_printf(s, " FG_LOW_CAP[%02x] : %02x\n",
275 		AXP288_FG_LOW_CAP_REG,
276 		fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG));
277 	seq_printf(s, "TUNING_CTL0[%02x] : %02x\n",
278 		AXP288_FG_TUNE0,
279 		fuel_gauge_reg_readb(info, AXP288_FG_TUNE0));
280 	seq_printf(s, "TUNING_CTL1[%02x] : %02x\n",
281 		AXP288_FG_TUNE1,
282 		fuel_gauge_reg_readb(info, AXP288_FG_TUNE1));
283 	seq_printf(s, "TUNING_CTL2[%02x] : %02x\n",
284 		AXP288_FG_TUNE2,
285 		fuel_gauge_reg_readb(info, AXP288_FG_TUNE2));
286 	seq_printf(s, "TUNING_CTL3[%02x] : %02x\n",
287 		AXP288_FG_TUNE3,
288 		fuel_gauge_reg_readb(info, AXP288_FG_TUNE3));
289 	seq_printf(s, "TUNING_CTL4[%02x] : %02x\n",
290 		AXP288_FG_TUNE4,
291 		fuel_gauge_reg_readb(info, AXP288_FG_TUNE4));
292 	seq_printf(s, "TUNING_CTL5[%02x] : %02x\n",
293 		AXP288_FG_TUNE5,
294 		fuel_gauge_reg_readb(info, AXP288_FG_TUNE5));
295 
296 	ret = pmic_read_adc_val("axp288-batt-temp", &raw_val, info);
297 	if (ret >= 0)
298 		seq_printf(s, "axp288-batttemp : %d\n", raw_val);
299 	ret = pmic_read_adc_val("axp288-pmic-temp", &raw_val, info);
300 	if (ret >= 0)
301 		seq_printf(s, "axp288-pmictemp : %d\n", raw_val);
302 	ret = pmic_read_adc_val("axp288-system-temp", &raw_val, info);
303 	if (ret >= 0)
304 		seq_printf(s, "axp288-systtemp : %d\n", raw_val);
305 	ret = pmic_read_adc_val("axp288-chrg-curr", &raw_val, info);
306 	if (ret >= 0)
307 		seq_printf(s, "axp288-chrgcurr : %d\n", raw_val);
308 	ret = pmic_read_adc_val("axp288-chrg-d-curr", &raw_val, info);
309 	if (ret >= 0)
310 		seq_printf(s, "axp288-dchrgcur : %d\n", raw_val);
311 	ret = pmic_read_adc_val("axp288-batt-volt", &raw_val, info);
312 	if (ret >= 0)
313 		seq_printf(s, "axp288-battvolt : %d\n", raw_val);
314 
315 	return 0;
316 }
317 
318 static int debug_open(struct inode *inode, struct file *file)
319 {
320 	return single_open(file, fuel_gauge_debug_show, inode->i_private);
321 }
322 
323 static const struct file_operations fg_debug_fops = {
324 	.open       = debug_open,
325 	.read       = seq_read,
326 	.llseek     = seq_lseek,
327 	.release    = single_release,
328 };
329 
330 static void fuel_gauge_create_debugfs(struct axp288_fg_info *info)
331 {
332 	info->debug_file = debugfs_create_file("fuelgauge", 0666, NULL,
333 		info, &fg_debug_fops);
334 }
335 
336 static void fuel_gauge_remove_debugfs(struct axp288_fg_info *info)
337 {
338 	debugfs_remove(info->debug_file);
339 }
340 #else
341 static inline void fuel_gauge_create_debugfs(struct axp288_fg_info *info)
342 {
343 }
344 static inline void fuel_gauge_remove_debugfs(struct axp288_fg_info *info)
345 {
346 }
347 #endif
348 
349 static void fuel_gauge_get_status(struct axp288_fg_info *info)
350 {
351 	int pwr_stat, ret;
352 	int charge, discharge;
353 
354 	pwr_stat = fuel_gauge_reg_readb(info, AXP20X_PWR_INPUT_STATUS);
355 	if (pwr_stat < 0) {
356 		dev_err(&info->pdev->dev,
357 			"PWR STAT read failed:%d\n", pwr_stat);
358 		return;
359 	}
360 	ret = pmic_read_adc_val("axp288-chrg-curr", &charge, info);
361 	if (ret < 0) {
362 		dev_err(&info->pdev->dev,
363 			"ADC charge current read failed:%d\n", ret);
364 		return;
365 	}
366 	ret = pmic_read_adc_val("axp288-chrg-d-curr", &discharge, info);
367 	if (ret < 0) {
368 		dev_err(&info->pdev->dev,
369 			"ADC discharge current read failed:%d\n", ret);
370 		return;
371 	}
372 
373 	if (charge > 0)
374 		info->status = POWER_SUPPLY_STATUS_CHARGING;
375 	else if (discharge > 0)
376 		info->status = POWER_SUPPLY_STATUS_DISCHARGING;
377 	else {
378 		if (pwr_stat & CHRG_STAT_BAT_PRESENT)
379 			info->status = POWER_SUPPLY_STATUS_FULL;
380 		else
381 			info->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
382 	}
383 }
384 
385 static int fuel_gauge_get_vbatt(struct axp288_fg_info *info, int *vbatt)
386 {
387 	int ret = 0, raw_val;
388 
389 	ret = pmic_read_adc_val("axp288-batt-volt", &raw_val, info);
390 	if (ret < 0)
391 		goto vbatt_read_fail;
392 
393 	*vbatt = VOLTAGE_FROM_ADC(raw_val);
394 vbatt_read_fail:
395 	return ret;
396 }
397 
398 static int fuel_gauge_get_current(struct axp288_fg_info *info, int *cur)
399 {
400 	int ret, value = 0;
401 	int charge, discharge;
402 
403 	ret = pmic_read_adc_val("axp288-chrg-curr", &charge, info);
404 	if (ret < 0)
405 		goto current_read_fail;
406 	ret = pmic_read_adc_val("axp288-chrg-d-curr", &discharge, info);
407 	if (ret < 0)
408 		goto current_read_fail;
409 
410 	if (charge > 0)
411 		value = charge;
412 	else if (discharge > 0)
413 		value = -1 * discharge;
414 
415 	*cur = value;
416 current_read_fail:
417 	return ret;
418 }
419 
420 static int temp_to_adc(struct axp288_fg_info *info, int tval)
421 {
422 	int rntc = 0, i, ret, adc_val;
423 	int rmin, rmax, tmin, tmax;
424 	int tcsz = info->pdata->tcsz;
425 
426 	/* get the Rntc resitance value for this temp */
427 	if (tval > info->pdata->thermistor_curve[0][1]) {
428 		rntc = info->pdata->thermistor_curve[0][0];
429 	} else if (tval <= info->pdata->thermistor_curve[tcsz-1][1]) {
430 		rntc = info->pdata->thermistor_curve[tcsz-1][0];
431 	} else {
432 		for (i = 1; i < tcsz; i++) {
433 			if (tval > info->pdata->thermistor_curve[i][1]) {
434 				rmin = info->pdata->thermistor_curve[i-1][0];
435 				rmax = info->pdata->thermistor_curve[i][0];
436 				tmin = info->pdata->thermistor_curve[i-1][1];
437 				tmax = info->pdata->thermistor_curve[i][1];
438 				rntc = rmin + ((rmax - rmin) *
439 					(tval - tmin) / (tmax - tmin));
440 				break;
441 			}
442 		}
443 	}
444 
445 	/* we need the current to calculate the proper adc voltage */
446 	ret = fuel_gauge_reg_readb(info, AXP20X_ADC_RATE);
447 	if (ret < 0) {
448 		dev_err(&info->pdev->dev, "%s:read err:%d\n", __func__, ret);
449 		ret = 0x30;
450 	}
451 
452 	/*
453 	 * temperature is proportional to NTS thermistor resistance
454 	 * ADC_RATE[5-4] determines current, 00=20uA,01=40uA,10=60uA,11=80uA
455 	 * [12-bit ADC VAL] = R_NTC(Ω) * current / 800
456 	 */
457 	adc_val = rntc * (20 + (20 * ((ret >> 4) & 0x3))) / 800;
458 
459 	return adc_val;
460 }
461 
462 static int adc_to_temp(struct axp288_fg_info *info, int adc_val)
463 {
464 	int ret, r, i, tval = 0;
465 	int rmin, rmax, tmin, tmax;
466 	int tcsz = info->pdata->tcsz;
467 
468 	ret = fuel_gauge_reg_readb(info, AXP20X_ADC_RATE);
469 	if (ret < 0) {
470 		dev_err(&info->pdev->dev, "%s:read err:%d\n", __func__, ret);
471 		ret = 0x30;
472 	}
473 
474 	/*
475 	 * temperature is proportional to NTS thermistor resistance
476 	 * ADC_RATE[5-4] determines current, 00=20uA,01=40uA,10=60uA,11=80uA
477 	 * R_NTC(Ω) = [12-bit ADC VAL] * 800 / current
478 	 */
479 	r = adc_val * 800 / (20 + (20 * ((ret >> 4) & 0x3)));
480 
481 	if (r < info->pdata->thermistor_curve[0][0]) {
482 		tval = info->pdata->thermistor_curve[0][1];
483 	} else if (r >= info->pdata->thermistor_curve[tcsz-1][0]) {
484 		tval = info->pdata->thermistor_curve[tcsz-1][1];
485 	} else {
486 		for (i = 1; i < tcsz; i++) {
487 			if (r < info->pdata->thermistor_curve[i][0]) {
488 				rmin = info->pdata->thermistor_curve[i-1][0];
489 				rmax = info->pdata->thermistor_curve[i][0];
490 				tmin = info->pdata->thermistor_curve[i-1][1];
491 				tmax = info->pdata->thermistor_curve[i][1];
492 				tval = tmin + ((tmax - tmin) *
493 					(r - rmin) / (rmax - rmin));
494 				break;
495 			}
496 		}
497 	}
498 
499 	return tval;
500 }
501 
502 static int fuel_gauge_get_btemp(struct axp288_fg_info *info, int *btemp)
503 {
504 	int ret, raw_val = 0;
505 
506 	ret = pmic_read_adc_val("axp288-batt-temp", &raw_val, info);
507 	if (ret < 0)
508 		goto temp_read_fail;
509 
510 	*btemp = adc_to_temp(info, raw_val);
511 
512 temp_read_fail:
513 	return ret;
514 }
515 
516 static int fuel_gauge_get_vocv(struct axp288_fg_info *info, int *vocv)
517 {
518 	int ret, value;
519 
520 	/* 12-bit data value, upper 8 in OCVH, lower 4 in OCVL */
521 	ret = fuel_gauge_reg_readb(info, AXP288_FG_OCVH_REG);
522 	if (ret < 0)
523 		goto vocv_read_fail;
524 	value = ret << 4;
525 
526 	ret = fuel_gauge_reg_readb(info, AXP288_FG_OCVL_REG);
527 	if (ret < 0)
528 		goto vocv_read_fail;
529 	value |= (ret & 0xf);
530 
531 	*vocv = VOLTAGE_FROM_ADC(value);
532 vocv_read_fail:
533 	return ret;
534 }
535 
536 static int fuel_gauge_battery_health(struct axp288_fg_info *info)
537 {
538 	int temp, vocv;
539 	int ret, health = POWER_SUPPLY_HEALTH_UNKNOWN;
540 
541 	ret = fuel_gauge_get_btemp(info, &temp);
542 	if (ret < 0)
543 		goto health_read_fail;
544 
545 	ret = fuel_gauge_get_vocv(info, &vocv);
546 	if (ret < 0)
547 		goto health_read_fail;
548 
549 	if (vocv > info->pdata->max_volt)
550 		health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
551 	else if (temp > info->pdata->max_temp)
552 		health = POWER_SUPPLY_HEALTH_OVERHEAT;
553 	else if (temp < info->pdata->min_temp)
554 		health = POWER_SUPPLY_HEALTH_COLD;
555 	else if (vocv < info->pdata->min_volt)
556 		health = POWER_SUPPLY_HEALTH_DEAD;
557 	else
558 		health = POWER_SUPPLY_HEALTH_GOOD;
559 
560 health_read_fail:
561 	return health;
562 }
563 
564 static int fuel_gauge_set_high_btemp_alert(struct axp288_fg_info *info)
565 {
566 	int ret, adc_val;
567 
568 	/* program temperature threshold as 1/16 ADC value */
569 	adc_val = temp_to_adc(info, info->pdata->max_temp);
570 	ret = fuel_gauge_reg_writeb(info, AXP20X_V_HTF_DISCHRG, adc_val >> 4);
571 
572 	return ret;
573 }
574 
575 static int fuel_gauge_set_low_btemp_alert(struct axp288_fg_info *info)
576 {
577 	int ret, adc_val;
578 
579 	/* program temperature threshold as 1/16 ADC value */
580 	adc_val = temp_to_adc(info, info->pdata->min_temp);
581 	ret = fuel_gauge_reg_writeb(info, AXP20X_V_LTF_DISCHRG, adc_val >> 4);
582 
583 	return ret;
584 }
585 
586 static int fuel_gauge_get_property(struct power_supply *ps,
587 		enum power_supply_property prop,
588 		union power_supply_propval *val)
589 {
590 	struct axp288_fg_info *info = power_supply_get_drvdata(ps);
591 	int ret = 0, value;
592 
593 	mutex_lock(&info->lock);
594 	switch (prop) {
595 	case POWER_SUPPLY_PROP_STATUS:
596 		fuel_gauge_get_status(info);
597 		val->intval = info->status;
598 		break;
599 	case POWER_SUPPLY_PROP_HEALTH:
600 		val->intval = fuel_gauge_battery_health(info);
601 		break;
602 	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
603 		ret = fuel_gauge_get_vbatt(info, &value);
604 		if (ret < 0)
605 			goto fuel_gauge_read_err;
606 		val->intval = PROP_VOLT(value);
607 		break;
608 	case POWER_SUPPLY_PROP_VOLTAGE_OCV:
609 		ret = fuel_gauge_get_vocv(info, &value);
610 		if (ret < 0)
611 			goto fuel_gauge_read_err;
612 		val->intval = PROP_VOLT(value);
613 		break;
614 	case POWER_SUPPLY_PROP_CURRENT_NOW:
615 		ret = fuel_gauge_get_current(info, &value);
616 		if (ret < 0)
617 			goto fuel_gauge_read_err;
618 		val->intval = PROP_CURR(value);
619 		break;
620 	case POWER_SUPPLY_PROP_PRESENT:
621 		ret = fuel_gauge_reg_readb(info, AXP20X_PWR_OP_MODE);
622 		if (ret < 0)
623 			goto fuel_gauge_read_err;
624 
625 		if (ret & CHRG_STAT_BAT_PRESENT)
626 			val->intval = 1;
627 		else
628 			val->intval = 0;
629 		break;
630 	case POWER_SUPPLY_PROP_CAPACITY:
631 		ret = fuel_gauge_reg_readb(info, AXP20X_FG_RES);
632 		if (ret < 0)
633 			goto fuel_gauge_read_err;
634 
635 		if (!(ret & FG_REP_CAP_VALID))
636 			dev_err(&info->pdev->dev,
637 				"capacity measurement not valid\n");
638 		val->intval = (ret & FG_REP_CAP_VAL_MASK);
639 		break;
640 	case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
641 		ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG);
642 		if (ret < 0)
643 			goto fuel_gauge_read_err;
644 		val->intval = (ret & 0x0f);
645 		break;
646 	case POWER_SUPPLY_PROP_TEMP:
647 		ret = fuel_gauge_get_btemp(info, &value);
648 		if (ret < 0)
649 			goto fuel_gauge_read_err;
650 		val->intval = PROP_TEMP(value);
651 		break;
652 	case POWER_SUPPLY_PROP_TEMP_MAX:
653 	case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
654 		val->intval = PROP_TEMP(info->pdata->max_temp);
655 		break;
656 	case POWER_SUPPLY_PROP_TEMP_MIN:
657 	case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
658 		val->intval = PROP_TEMP(info->pdata->min_temp);
659 		break;
660 	case POWER_SUPPLY_PROP_TECHNOLOGY:
661 		val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
662 		break;
663 	case POWER_SUPPLY_PROP_CHARGE_NOW:
664 		ret = fuel_gauge_reg_readb(info, AXP288_FG_CC_MTR1_REG);
665 		if (ret < 0)
666 			goto fuel_gauge_read_err;
667 
668 		value = (ret & FG_CC_MTR1_VAL_MASK) << 8;
669 		ret = fuel_gauge_reg_readb(info, AXP288_FG_CC_MTR0_REG);
670 		if (ret < 0)
671 			goto fuel_gauge_read_err;
672 		value |= (ret & FG_CC_MTR0_VAL_MASK);
673 		val->intval = value * FG_DES_CAP_RES_LSB;
674 		break;
675 	case POWER_SUPPLY_PROP_CHARGE_FULL:
676 		ret = fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP1_REG);
677 		if (ret < 0)
678 			goto fuel_gauge_read_err;
679 
680 		value = (ret & FG_DES_CAP1_VAL_MASK) << 8;
681 		ret = fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP0_REG);
682 		if (ret < 0)
683 			goto fuel_gauge_read_err;
684 		value |= (ret & FG_DES_CAP0_VAL_MASK);
685 		val->intval = value * FG_DES_CAP_RES_LSB;
686 		break;
687 	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
688 		val->intval = PROP_CURR(info->pdata->design_cap);
689 		break;
690 	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
691 		val->intval = PROP_VOLT(info->pdata->max_volt);
692 		break;
693 	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
694 		val->intval = PROP_VOLT(info->pdata->min_volt);
695 		break;
696 	case POWER_SUPPLY_PROP_MODEL_NAME:
697 		val->strval = info->pdata->battid;
698 		break;
699 	default:
700 		mutex_unlock(&info->lock);
701 		return -EINVAL;
702 	}
703 
704 	mutex_unlock(&info->lock);
705 	return 0;
706 
707 fuel_gauge_read_err:
708 	mutex_unlock(&info->lock);
709 	return ret;
710 }
711 
712 static int fuel_gauge_set_property(struct power_supply *ps,
713 		enum power_supply_property prop,
714 		const union power_supply_propval *val)
715 {
716 	struct axp288_fg_info *info = power_supply_get_drvdata(ps);
717 	int ret = 0;
718 
719 	mutex_lock(&info->lock);
720 	switch (prop) {
721 	case POWER_SUPPLY_PROP_STATUS:
722 		info->status = val->intval;
723 		break;
724 	case POWER_SUPPLY_PROP_TEMP_MIN:
725 	case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
726 		if ((val->intval < PD_DEF_MIN_TEMP) ||
727 			(val->intval > PD_DEF_MAX_TEMP)) {
728 			ret = -EINVAL;
729 			break;
730 		}
731 		info->pdata->min_temp = UNPROP_TEMP(val->intval);
732 		ret = fuel_gauge_set_low_btemp_alert(info);
733 		if (ret < 0)
734 			dev_err(&info->pdev->dev,
735 				"temp alert min set fail:%d\n", ret);
736 		break;
737 	case POWER_SUPPLY_PROP_TEMP_MAX:
738 	case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
739 		if ((val->intval < PD_DEF_MIN_TEMP) ||
740 			(val->intval > PD_DEF_MAX_TEMP)) {
741 			ret = -EINVAL;
742 			break;
743 		}
744 		info->pdata->max_temp = UNPROP_TEMP(val->intval);
745 		ret = fuel_gauge_set_high_btemp_alert(info);
746 		if (ret < 0)
747 			dev_err(&info->pdev->dev,
748 				"temp alert max set fail:%d\n", ret);
749 		break;
750 	case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
751 		if ((val->intval < 0) || (val->intval > 15)) {
752 			ret = -EINVAL;
753 			break;
754 		}
755 		ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG);
756 		if (ret < 0)
757 			break;
758 		ret &= 0xf0;
759 		ret |= (val->intval & 0xf);
760 		ret = fuel_gauge_reg_writeb(info, AXP288_FG_LOW_CAP_REG, ret);
761 		break;
762 	default:
763 		ret = -EINVAL;
764 		break;
765 	}
766 
767 	mutex_unlock(&info->lock);
768 	return ret;
769 }
770 
771 static int fuel_gauge_property_is_writeable(struct power_supply *psy,
772 	enum power_supply_property psp)
773 {
774 	int ret;
775 
776 	switch (psp) {
777 	case POWER_SUPPLY_PROP_STATUS:
778 	case POWER_SUPPLY_PROP_TEMP_MIN:
779 	case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
780 	case POWER_SUPPLY_PROP_TEMP_MAX:
781 	case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
782 	case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
783 		ret = 1;
784 		break;
785 	default:
786 		ret = 0;
787 	}
788 
789 	return ret;
790 }
791 
792 static void fuel_gauge_status_monitor(struct work_struct *work)
793 {
794 	struct axp288_fg_info *info = container_of(work,
795 		struct axp288_fg_info, status_monitor.work);
796 
797 	fuel_gauge_get_status(info);
798 	power_supply_changed(info->bat);
799 	schedule_delayed_work(&info->status_monitor, STATUS_MON_DELAY_JIFFIES);
800 }
801 
802 static irqreturn_t fuel_gauge_thread_handler(int irq, void *dev)
803 {
804 	struct axp288_fg_info *info = dev;
805 	int i;
806 
807 	for (i = 0; i < AXP288_FG_INTR_NUM; i++) {
808 		if (info->irq[i] == irq)
809 			break;
810 	}
811 
812 	if (i >= AXP288_FG_INTR_NUM) {
813 		dev_warn(&info->pdev->dev, "spurious interrupt!!\n");
814 		return IRQ_NONE;
815 	}
816 
817 	switch (i) {
818 	case QWBTU_IRQ:
819 		dev_info(&info->pdev->dev,
820 			"Quit Battery under temperature in work mode IRQ (QWBTU)\n");
821 		break;
822 	case WBTU_IRQ:
823 		dev_info(&info->pdev->dev,
824 			"Battery under temperature in work mode IRQ (WBTU)\n");
825 		break;
826 	case QWBTO_IRQ:
827 		dev_info(&info->pdev->dev,
828 			"Quit Battery over temperature in work mode IRQ (QWBTO)\n");
829 		break;
830 	case WBTO_IRQ:
831 		dev_info(&info->pdev->dev,
832 			"Battery over temperature in work mode IRQ (WBTO)\n");
833 		break;
834 	case WL2_IRQ:
835 		dev_info(&info->pdev->dev, "Low Batt Warning(2) INTR\n");
836 		break;
837 	case WL1_IRQ:
838 		dev_info(&info->pdev->dev, "Low Batt Warning(1) INTR\n");
839 		break;
840 	default:
841 		dev_warn(&info->pdev->dev, "Spurious Interrupt!!!\n");
842 	}
843 
844 	power_supply_changed(info->bat);
845 	return IRQ_HANDLED;
846 }
847 
848 static void fuel_gauge_external_power_changed(struct power_supply *psy)
849 {
850 	struct axp288_fg_info *info = power_supply_get_drvdata(psy);
851 
852 	power_supply_changed(info->bat);
853 }
854 
855 static const struct power_supply_desc fuel_gauge_desc = {
856 	.name			= DEV_NAME,
857 	.type			= POWER_SUPPLY_TYPE_BATTERY,
858 	.properties		= fuel_gauge_props,
859 	.num_properties		= ARRAY_SIZE(fuel_gauge_props),
860 	.get_property		= fuel_gauge_get_property,
861 	.set_property		= fuel_gauge_set_property,
862 	.property_is_writeable	= fuel_gauge_property_is_writeable,
863 	.external_power_changed	= fuel_gauge_external_power_changed,
864 };
865 
866 static int fuel_gauge_set_lowbatt_thresholds(struct axp288_fg_info *info)
867 {
868 	int ret;
869 	u8 reg_val;
870 
871 	ret = fuel_gauge_reg_readb(info, AXP20X_FG_RES);
872 	if (ret < 0) {
873 		dev_err(&info->pdev->dev, "%s:read err:%d\n", __func__, ret);
874 		return ret;
875 	}
876 	ret = (ret & FG_REP_CAP_VAL_MASK);
877 
878 	if (ret > FG_LOW_CAP_WARN_THR)
879 		reg_val = FG_LOW_CAP_WARN_THR;
880 	else if (ret > FG_LOW_CAP_CRIT_THR)
881 		reg_val = FG_LOW_CAP_CRIT_THR;
882 	else
883 		reg_val = FG_LOW_CAP_SHDN_THR;
884 
885 	reg_val |= FG_LOW_CAP_THR1_VAL;
886 	ret = fuel_gauge_reg_writeb(info, AXP288_FG_LOW_CAP_REG, reg_val);
887 	if (ret < 0)
888 		dev_err(&info->pdev->dev, "%s:write err:%d\n", __func__, ret);
889 
890 	return ret;
891 }
892 
893 static int fuel_gauge_program_vbatt_full(struct axp288_fg_info *info)
894 {
895 	int ret;
896 	u8 val;
897 
898 	ret = fuel_gauge_reg_readb(info, AXP20X_CHRG_CTRL1);
899 	if (ret < 0)
900 		goto fg_prog_ocv_fail;
901 	else
902 		val = (ret & ~CHRG_CCCV_CV_MASK);
903 
904 	switch (info->pdata->max_volt) {
905 	case CV_4100:
906 		val |= (CHRG_CCCV_CV_4100MV << CHRG_CCCV_CV_BIT_POS);
907 		break;
908 	case CV_4150:
909 		val |= (CHRG_CCCV_CV_4150MV << CHRG_CCCV_CV_BIT_POS);
910 		break;
911 	case CV_4200:
912 		val |= (CHRG_CCCV_CV_4200MV << CHRG_CCCV_CV_BIT_POS);
913 		break;
914 	case CV_4350:
915 		val |= (CHRG_CCCV_CV_4350MV << CHRG_CCCV_CV_BIT_POS);
916 		break;
917 	default:
918 		val |= (CHRG_CCCV_CV_4200MV << CHRG_CCCV_CV_BIT_POS);
919 		break;
920 	}
921 
922 	ret = fuel_gauge_reg_writeb(info, AXP20X_CHRG_CTRL1, val);
923 fg_prog_ocv_fail:
924 	return ret;
925 }
926 
927 static int fuel_gauge_program_design_cap(struct axp288_fg_info *info)
928 {
929 	int ret;
930 
931 	ret = fuel_gauge_reg_writeb(info,
932 		AXP288_FG_DES_CAP1_REG, info->pdata->cap1);
933 	if (ret < 0)
934 		goto fg_prog_descap_fail;
935 
936 	ret = fuel_gauge_reg_writeb(info,
937 		AXP288_FG_DES_CAP0_REG, info->pdata->cap0);
938 
939 fg_prog_descap_fail:
940 	return ret;
941 }
942 
943 static int fuel_gauge_program_ocv_curve(struct axp288_fg_info *info)
944 {
945 	int ret = 0, i;
946 
947 	for (i = 0; i < OCV_CURVE_SIZE; i++) {
948 		ret = fuel_gauge_reg_writeb(info,
949 			AXP288_FG_OCV_CURVE_REG + i, info->pdata->ocv_curve[i]);
950 		if (ret < 0)
951 			goto fg_prog_ocv_fail;
952 	}
953 
954 fg_prog_ocv_fail:
955 	return ret;
956 }
957 
958 static int fuel_gauge_program_rdc_vals(struct axp288_fg_info *info)
959 {
960 	int ret;
961 
962 	ret = fuel_gauge_reg_writeb(info,
963 		AXP288_FG_RDC1_REG, info->pdata->rdc1);
964 	if (ret < 0)
965 		goto fg_prog_ocv_fail;
966 
967 	ret = fuel_gauge_reg_writeb(info,
968 		AXP288_FG_RDC0_REG, info->pdata->rdc0);
969 
970 fg_prog_ocv_fail:
971 	return ret;
972 }
973 
974 static void fuel_gauge_init_config_regs(struct axp288_fg_info *info)
975 {
976 	int ret;
977 
978 	/*
979 	 * check if the config data is already
980 	 * programmed and if so just return.
981 	 */
982 
983 	ret = fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP1_REG);
984 	if (ret < 0) {
985 		dev_warn(&info->pdev->dev, "CAP1 reg read err!!\n");
986 	} else if (!(ret & FG_DES_CAP1_VALID)) {
987 		dev_info(&info->pdev->dev, "FG data needs to be initialized\n");
988 	} else {
989 		dev_info(&info->pdev->dev, "FG data is already initialized\n");
990 		return;
991 	}
992 
993 	ret = fuel_gauge_program_vbatt_full(info);
994 	if (ret < 0)
995 		dev_err(&info->pdev->dev, "set vbatt full fail:%d\n", ret);
996 
997 	ret = fuel_gauge_program_design_cap(info);
998 	if (ret < 0)
999 		dev_err(&info->pdev->dev, "set design cap fail:%d\n", ret);
1000 
1001 	ret = fuel_gauge_program_rdc_vals(info);
1002 	if (ret < 0)
1003 		dev_err(&info->pdev->dev, "set rdc fail:%d\n", ret);
1004 
1005 	ret = fuel_gauge_program_ocv_curve(info);
1006 	if (ret < 0)
1007 		dev_err(&info->pdev->dev, "set ocv curve fail:%d\n", ret);
1008 
1009 	ret = fuel_gauge_set_lowbatt_thresholds(info);
1010 	if (ret < 0)
1011 		dev_err(&info->pdev->dev, "lowbatt thr set fail:%d\n", ret);
1012 
1013 	ret = fuel_gauge_reg_writeb(info, AXP20X_CC_CTRL, 0xef);
1014 	if (ret < 0)
1015 		dev_err(&info->pdev->dev, "gauge cntl set fail:%d\n", ret);
1016 }
1017 
1018 static void fuel_gauge_init_irq(struct axp288_fg_info *info)
1019 {
1020 	int ret, i, pirq;
1021 
1022 	for (i = 0; i < AXP288_FG_INTR_NUM; i++) {
1023 		pirq = platform_get_irq(info->pdev, i);
1024 		info->irq[i] = regmap_irq_get_virq(info->regmap_irqc, pirq);
1025 		if (info->irq[i] < 0) {
1026 			dev_warn(&info->pdev->dev,
1027 				"regmap_irq get virq failed for IRQ %d: %d\n",
1028 				pirq, info->irq[i]);
1029 			info->irq[i] = -1;
1030 			goto intr_failed;
1031 		}
1032 		ret = request_threaded_irq(info->irq[i],
1033 				NULL, fuel_gauge_thread_handler,
1034 				IRQF_ONESHOT, DEV_NAME, info);
1035 		if (ret) {
1036 			dev_warn(&info->pdev->dev,
1037 				"request irq failed for IRQ %d: %d\n",
1038 				pirq, info->irq[i]);
1039 			info->irq[i] = -1;
1040 			goto intr_failed;
1041 		} else {
1042 			dev_info(&info->pdev->dev, "HW IRQ %d -> VIRQ %d\n",
1043 				pirq, info->irq[i]);
1044 		}
1045 	}
1046 	return;
1047 
1048 intr_failed:
1049 	for (; i > 0; i--) {
1050 		free_irq(info->irq[i - 1], info);
1051 		info->irq[i - 1] = -1;
1052 	}
1053 }
1054 
1055 static void fuel_gauge_init_hw_regs(struct axp288_fg_info *info)
1056 {
1057 	int ret;
1058 	unsigned int val;
1059 
1060 	ret = fuel_gauge_set_high_btemp_alert(info);
1061 	if (ret < 0)
1062 		dev_err(&info->pdev->dev, "high batt temp set fail:%d\n", ret);
1063 
1064 	ret = fuel_gauge_set_low_btemp_alert(info);
1065 	if (ret < 0)
1066 		dev_err(&info->pdev->dev, "low batt temp set fail:%d\n", ret);
1067 
1068 	/* enable interrupts */
1069 	val = fuel_gauge_reg_readb(info, AXP20X_IRQ3_EN);
1070 	val |= TEMP_IRQ_CFG_MASK;
1071 	fuel_gauge_reg_writeb(info, AXP20X_IRQ3_EN, val);
1072 
1073 	val = fuel_gauge_reg_readb(info, AXP20X_IRQ4_EN);
1074 	val |= FG_IRQ_CFG_LOWBATT_MASK;
1075 	val = fuel_gauge_reg_writeb(info, AXP20X_IRQ4_EN, val);
1076 }
1077 
1078 static int axp288_fuel_gauge_probe(struct platform_device *pdev)
1079 {
1080 	int ret = 0;
1081 	struct axp288_fg_info *info;
1082 	struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
1083 	struct power_supply_config psy_cfg = {};
1084 
1085 	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
1086 	if (!info)
1087 		return -ENOMEM;
1088 
1089 	info->pdev = pdev;
1090 	info->regmap = axp20x->regmap;
1091 	info->regmap_irqc = axp20x->regmap_irqc;
1092 	info->status = POWER_SUPPLY_STATUS_UNKNOWN;
1093 	info->pdata = pdev->dev.platform_data;
1094 	if (!info->pdata)
1095 		return -ENODEV;
1096 
1097 	platform_set_drvdata(pdev, info);
1098 
1099 	mutex_init(&info->lock);
1100 	INIT_DELAYED_WORK(&info->status_monitor, fuel_gauge_status_monitor);
1101 
1102 	psy_cfg.drv_data = info;
1103 	info->bat = power_supply_register(&pdev->dev, &fuel_gauge_desc, &psy_cfg);
1104 	if (IS_ERR(info->bat)) {
1105 		ret = PTR_ERR(info->bat);
1106 		dev_err(&pdev->dev, "failed to register battery: %d\n", ret);
1107 		return ret;
1108 	}
1109 
1110 	fuel_gauge_create_debugfs(info);
1111 	fuel_gauge_init_config_regs(info);
1112 	fuel_gauge_init_irq(info);
1113 	fuel_gauge_init_hw_regs(info);
1114 	schedule_delayed_work(&info->status_monitor, STATUS_MON_DELAY_JIFFIES);
1115 
1116 	return ret;
1117 }
1118 
1119 static const struct platform_device_id axp288_fg_id_table[] = {
1120 	{ .name = DEV_NAME },
1121 	{},
1122 };
1123 
1124 static int axp288_fuel_gauge_remove(struct platform_device *pdev)
1125 {
1126 	struct axp288_fg_info *info = platform_get_drvdata(pdev);
1127 	int i;
1128 
1129 	cancel_delayed_work_sync(&info->status_monitor);
1130 	power_supply_unregister(info->bat);
1131 	fuel_gauge_remove_debugfs(info);
1132 
1133 	for (i = 0; i < AXP288_FG_INTR_NUM; i++)
1134 		if (info->irq[i] >= 0)
1135 			free_irq(info->irq[i], info);
1136 
1137 	return 0;
1138 }
1139 
1140 static struct platform_driver axp288_fuel_gauge_driver = {
1141 	.probe = axp288_fuel_gauge_probe,
1142 	.remove = axp288_fuel_gauge_remove,
1143 	.id_table = axp288_fg_id_table,
1144 	.driver = {
1145 		.name = DEV_NAME,
1146 	},
1147 };
1148 
1149 module_platform_driver(axp288_fuel_gauge_driver);
1150 
1151 MODULE_AUTHOR("Ramakrishna Pallala <ramakrishna.pallala@intel.com>");
1152 MODULE_AUTHOR("Todd Brandt <todd.e.brandt@linux.intel.com>");
1153 MODULE_DESCRIPTION("Xpower AXP288 Fuel Gauge Driver");
1154 MODULE_LICENSE("GPL");
1155