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/device.h>
26#include <linux/workqueue.h>
27#include <linux/mfd/axp20x.h>
28#include <linux/platform_device.h>
29#include <linux/power_supply.h>
30#include <linux/iio/consumer.h>
31#include <linux/debugfs.h>
32#include <linux/seq_file.h>
33
34#define CHRG_STAT_BAT_SAFE_MODE		(1 << 3)
35#define CHRG_STAT_BAT_VALID			(1 << 4)
36#define CHRG_STAT_BAT_PRESENT		(1 << 5)
37#define CHRG_STAT_CHARGING			(1 << 6)
38#define CHRG_STAT_PMIC_OTP			(1 << 7)
39
40#define CHRG_CCCV_CC_MASK			0xf     /* 4 bits */
41#define CHRG_CCCV_CC_BIT_POS		0
42#define CHRG_CCCV_CC_OFFSET			200     /* 200mA */
43#define CHRG_CCCV_CC_LSB_RES		200     /* 200mA */
44#define CHRG_CCCV_ITERM_20P			(1 << 4)    /* 20% of CC */
45#define CHRG_CCCV_CV_MASK			0x60        /* 2 bits */
46#define CHRG_CCCV_CV_BIT_POS		5
47#define CHRG_CCCV_CV_4100MV			0x0     /* 4.10V */
48#define CHRG_CCCV_CV_4150MV			0x1     /* 4.15V */
49#define CHRG_CCCV_CV_4200MV			0x2     /* 4.20V */
50#define CHRG_CCCV_CV_4350MV			0x3     /* 4.35V */
51#define CHRG_CCCV_CHG_EN			(1 << 7)
52
53#define CV_4100						4100    /* 4100mV */
54#define CV_4150						4150    /* 4150mV */
55#define CV_4200						4200    /* 4200mV */
56#define CV_4350						4350    /* 4350mV */
57
58#define TEMP_IRQ_CFG_QWBTU			(1 << 0)
59#define TEMP_IRQ_CFG_WBTU			(1 << 1)
60#define TEMP_IRQ_CFG_QWBTO			(1 << 2)
61#define TEMP_IRQ_CFG_WBTO			(1 << 3)
62#define TEMP_IRQ_CFG_MASK			0xf
63
64#define FG_IRQ_CFG_LOWBATT_WL2		(1 << 0)
65#define FG_IRQ_CFG_LOWBATT_WL1		(1 << 1)
66#define FG_IRQ_CFG_LOWBATT_MASK		0x3
67#define LOWBAT_IRQ_STAT_LOWBATT_WL2	(1 << 0)
68#define LOWBAT_IRQ_STAT_LOWBATT_WL1	(1 << 1)
69
70#define FG_CNTL_OCV_ADJ_STAT		(1 << 2)
71#define FG_CNTL_OCV_ADJ_EN			(1 << 3)
72#define FG_CNTL_CAP_ADJ_STAT		(1 << 4)
73#define FG_CNTL_CAP_ADJ_EN			(1 << 5)
74#define FG_CNTL_CC_EN				(1 << 6)
75#define FG_CNTL_GAUGE_EN			(1 << 7)
76
77#define FG_REP_CAP_VALID			(1 << 7)
78#define FG_REP_CAP_VAL_MASK			0x7F
79
80#define FG_DES_CAP1_VALID			(1 << 7)
81#define FG_DES_CAP1_VAL_MASK		0x7F
82#define FG_DES_CAP0_VAL_MASK		0xFF
83#define FG_DES_CAP_RES_LSB			1456    /* 1.456mAhr */
84
85#define FG_CC_MTR1_VALID			(1 << 7)
86#define FG_CC_MTR1_VAL_MASK			0x7F
87#define FG_CC_MTR0_VAL_MASK			0xFF
88#define FG_DES_CC_RES_LSB			1456    /* 1.456mAhr */
89
90#define FG_OCV_CAP_VALID			(1 << 7)
91#define FG_OCV_CAP_VAL_MASK			0x7F
92#define FG_CC_CAP_VALID				(1 << 7)
93#define FG_CC_CAP_VAL_MASK			0x7F
94
95#define FG_LOW_CAP_THR1_MASK		0xf0    /* 5% tp 20% */
96#define FG_LOW_CAP_THR1_VAL			0xa0    /* 15 perc */
97#define FG_LOW_CAP_THR2_MASK		0x0f    /* 0% to 15% */
98#define FG_LOW_CAP_WARN_THR			14  /* 14 perc */
99#define FG_LOW_CAP_CRIT_THR			4   /* 4 perc */
100#define FG_LOW_CAP_SHDN_THR			0   /* 0 perc */
101
102#define STATUS_MON_DELAY_JIFFIES    (HZ * 60)   /*60 sec */
103#define NR_RETRY_CNT    3
104#define DEV_NAME	"axp288_fuel_gauge"
105
106/* 1.1mV per LSB expressed in uV */
107#define VOLTAGE_FROM_ADC(a)			((a * 11) / 10)
108/* properties converted to tenths of degrees, uV, uA, uW */
109#define PROP_TEMP(a)		((a) * 10)
110#define UNPROP_TEMP(a)		((a) / 10)
111#define PROP_VOLT(a)		((a) * 1000)
112#define PROP_CURR(a)		((a) * 1000)
113
114#define AXP288_FG_INTR_NUM	6
115enum {
116	QWBTU_IRQ = 0,
117	WBTU_IRQ,
118	QWBTO_IRQ,
119	WBTO_IRQ,
120	WL2_IRQ,
121	WL1_IRQ,
122};
123
124struct axp288_fg_info {
125	struct platform_device *pdev;
126	struct axp20x_fg_pdata *pdata;
127	struct regmap *regmap;
128	struct regmap_irq_chip_data *regmap_irqc;
129	int irq[AXP288_FG_INTR_NUM];
130	struct power_supply *bat;
131	struct mutex lock;
132	int status;
133	struct delayed_work status_monitor;
134	struct dentry *debug_file;
135};
136
137static enum power_supply_property fuel_gauge_props[] = {
138	POWER_SUPPLY_PROP_STATUS,
139	POWER_SUPPLY_PROP_PRESENT,
140	POWER_SUPPLY_PROP_HEALTH,
141	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
142	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
143	POWER_SUPPLY_PROP_VOLTAGE_NOW,
144	POWER_SUPPLY_PROP_VOLTAGE_OCV,
145	POWER_SUPPLY_PROP_CURRENT_NOW,
146	POWER_SUPPLY_PROP_CAPACITY,
147	POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN,
148	POWER_SUPPLY_PROP_TEMP,
149	POWER_SUPPLY_PROP_TEMP_MAX,
150	POWER_SUPPLY_PROP_TEMP_MIN,
151	POWER_SUPPLY_PROP_TEMP_ALERT_MIN,
152	POWER_SUPPLY_PROP_TEMP_ALERT_MAX,
153	POWER_SUPPLY_PROP_TECHNOLOGY,
154	POWER_SUPPLY_PROP_CHARGE_FULL,
155	POWER_SUPPLY_PROP_CHARGE_NOW,
156	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
157	POWER_SUPPLY_PROP_MODEL_NAME,
158};
159
160static int fuel_gauge_reg_readb(struct axp288_fg_info *info, int reg)
161{
162	int ret, i;
163	unsigned int val;
164
165	for (i = 0; i < NR_RETRY_CNT; i++) {
166		ret = regmap_read(info->regmap, reg, &val);
167		if (ret == -EBUSY)
168			continue;
169		else
170			break;
171	}
172
173	if (ret < 0)
174		dev_err(&info->pdev->dev, "axp288 reg read err:%d\n", ret);
175
176	return val;
177}
178
179static int fuel_gauge_reg_writeb(struct axp288_fg_info *info, int reg, u8 val)
180{
181	int ret;
182
183	ret = regmap_write(info->regmap, reg, (unsigned int)val);
184
185	if (ret < 0)
186		dev_err(&info->pdev->dev, "axp288 reg write err:%d\n", ret);
187
188	return ret;
189}
190
191static int pmic_read_adc_val(const char *name, int *raw_val,
192		struct axp288_fg_info *info)
193{
194	int ret, val = 0;
195	struct iio_channel *indio_chan;
196
197	indio_chan = iio_channel_get(NULL, name);
198	if (IS_ERR_OR_NULL(indio_chan)) {
199		ret = PTR_ERR(indio_chan);
200		goto exit;
201	}
202	ret = iio_read_channel_raw(indio_chan, &val);
203	if (ret < 0) {
204		dev_err(&info->pdev->dev,
205			"IIO channel read error: %x, %x\n", ret, val);
206		goto err_exit;
207	}
208
209	dev_dbg(&info->pdev->dev, "adc raw val=%x\n", val);
210	*raw_val = val;
211
212err_exit:
213	iio_channel_release(indio_chan);
214exit:
215	return ret;
216}
217
218#ifdef CONFIG_DEBUG_FS
219static int fuel_gauge_debug_show(struct seq_file *s, void *data)
220{
221	struct axp288_fg_info *info = s->private;
222	int raw_val, ret;
223
224	seq_printf(s, " PWR_STATUS[%02x] : %02x\n",
225		AXP20X_PWR_INPUT_STATUS,
226		fuel_gauge_reg_readb(info, AXP20X_PWR_INPUT_STATUS));
227	seq_printf(s, "PWR_OP_MODE[%02x] : %02x\n",
228		AXP20X_PWR_OP_MODE,
229		fuel_gauge_reg_readb(info, AXP20X_PWR_OP_MODE));
230	seq_printf(s, " CHRG_CTRL1[%02x] : %02x\n",
231		AXP20X_CHRG_CTRL1,
232		fuel_gauge_reg_readb(info, AXP20X_CHRG_CTRL1));
233	seq_printf(s, "       VLTF[%02x] : %02x\n",
234		AXP20X_V_LTF_DISCHRG,
235		fuel_gauge_reg_readb(info, AXP20X_V_LTF_DISCHRG));
236	seq_printf(s, "       VHTF[%02x] : %02x\n",
237		AXP20X_V_HTF_DISCHRG,
238		fuel_gauge_reg_readb(info, AXP20X_V_HTF_DISCHRG));
239	seq_printf(s, "    CC_CTRL[%02x] : %02x\n",
240		AXP20X_CC_CTRL,
241		fuel_gauge_reg_readb(info, AXP20X_CC_CTRL));
242	seq_printf(s, "BATTERY CAP[%02x] : %02x\n",
243		AXP20X_FG_RES,
244		fuel_gauge_reg_readb(info, AXP20X_FG_RES));
245	seq_printf(s, "    FG_RDC1[%02x] : %02x\n",
246		AXP288_FG_RDC1_REG,
247		fuel_gauge_reg_readb(info, AXP288_FG_RDC1_REG));
248	seq_printf(s, "    FG_RDC0[%02x] : %02x\n",
249		AXP288_FG_RDC0_REG,
250		fuel_gauge_reg_readb(info, AXP288_FG_RDC0_REG));
251	seq_printf(s, "    FG_OCVH[%02x] : %02x\n",
252		AXP288_FG_OCVH_REG,
253		fuel_gauge_reg_readb(info, AXP288_FG_OCVH_REG));
254	seq_printf(s, "    FG_OCVL[%02x] : %02x\n",
255		AXP288_FG_OCVL_REG,
256		fuel_gauge_reg_readb(info, AXP288_FG_OCVL_REG));
257	seq_printf(s, "FG_DES_CAP1[%02x] : %02x\n",
258		AXP288_FG_DES_CAP1_REG,
259		fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP1_REG));
260	seq_printf(s, "FG_DES_CAP0[%02x] : %02x\n",
261		AXP288_FG_DES_CAP0_REG,
262		fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP0_REG));
263	seq_printf(s, " FG_CC_MTR1[%02x] : %02x\n",
264		AXP288_FG_CC_MTR1_REG,
265		fuel_gauge_reg_readb(info, AXP288_FG_CC_MTR1_REG));
266	seq_printf(s, " FG_CC_MTR0[%02x] : %02x\n",
267		AXP288_FG_CC_MTR0_REG,
268		fuel_gauge_reg_readb(info, AXP288_FG_CC_MTR0_REG));
269	seq_printf(s, " FG_OCV_CAP[%02x] : %02x\n",
270		AXP288_FG_OCV_CAP_REG,
271		fuel_gauge_reg_readb(info, AXP288_FG_OCV_CAP_REG));
272	seq_printf(s, "  FG_CC_CAP[%02x] : %02x\n",
273		AXP288_FG_CC_CAP_REG,
274		fuel_gauge_reg_readb(info, AXP288_FG_CC_CAP_REG));
275	seq_printf(s, " FG_LOW_CAP[%02x] : %02x\n",
276		AXP288_FG_LOW_CAP_REG,
277		fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG));
278	seq_printf(s, "TUNING_CTL0[%02x] : %02x\n",
279		AXP288_FG_TUNE0,
280		fuel_gauge_reg_readb(info, AXP288_FG_TUNE0));
281	seq_printf(s, "TUNING_CTL1[%02x] : %02x\n",
282		AXP288_FG_TUNE1,
283		fuel_gauge_reg_readb(info, AXP288_FG_TUNE1));
284	seq_printf(s, "TUNING_CTL2[%02x] : %02x\n",
285		AXP288_FG_TUNE2,
286		fuel_gauge_reg_readb(info, AXP288_FG_TUNE2));
287	seq_printf(s, "TUNING_CTL3[%02x] : %02x\n",
288		AXP288_FG_TUNE3,
289		fuel_gauge_reg_readb(info, AXP288_FG_TUNE3));
290	seq_printf(s, "TUNING_CTL4[%02x] : %02x\n",
291		AXP288_FG_TUNE4,
292		fuel_gauge_reg_readb(info, AXP288_FG_TUNE4));
293	seq_printf(s, "TUNING_CTL5[%02x] : %02x\n",
294		AXP288_FG_TUNE5,
295		fuel_gauge_reg_readb(info, AXP288_FG_TUNE5));
296
297	ret = pmic_read_adc_val("axp288-batt-temp", &raw_val, info);
298	if (ret >= 0)
299		seq_printf(s, "axp288-batttemp : %d\n", raw_val);
300	ret = pmic_read_adc_val("axp288-pmic-temp", &raw_val, info);
301	if (ret >= 0)
302		seq_printf(s, "axp288-pmictemp : %d\n", raw_val);
303	ret = pmic_read_adc_val("axp288-system-temp", &raw_val, info);
304	if (ret >= 0)
305		seq_printf(s, "axp288-systtemp : %d\n", raw_val);
306	ret = pmic_read_adc_val("axp288-chrg-curr", &raw_val, info);
307	if (ret >= 0)
308		seq_printf(s, "axp288-chrgcurr : %d\n", raw_val);
309	ret = pmic_read_adc_val("axp288-chrg-d-curr", &raw_val, info);
310	if (ret >= 0)
311		seq_printf(s, "axp288-dchrgcur : %d\n", raw_val);
312	ret = pmic_read_adc_val("axp288-batt-volt", &raw_val, info);
313	if (ret >= 0)
314		seq_printf(s, "axp288-battvolt : %d\n", raw_val);
315
316	return 0;
317}
318
319static int debug_open(struct inode *inode, struct file *file)
320{
321	return single_open(file, fuel_gauge_debug_show, inode->i_private);
322}
323
324static const struct file_operations fg_debug_fops = {
325	.open       = debug_open,
326	.read       = seq_read,
327	.llseek     = seq_lseek,
328	.release    = single_release,
329};
330
331static void fuel_gauge_create_debugfs(struct axp288_fg_info *info)
332{
333	info->debug_file = debugfs_create_file("fuelgauge", 0666, NULL,
334		info, &fg_debug_fops);
335}
336
337static void fuel_gauge_remove_debugfs(struct axp288_fg_info *info)
338{
339	debugfs_remove(info->debug_file);
340}
341#else
342static inline void fuel_gauge_create_debugfs(struct axp288_fg_info *info)
343{
344}
345static inline void fuel_gauge_remove_debugfs(struct axp288_fg_info *info)
346{
347}
348#endif
349
350static void fuel_gauge_get_status(struct axp288_fg_info *info)
351{
352	int pwr_stat, ret;
353	int charge, discharge;
354
355	pwr_stat = fuel_gauge_reg_readb(info, AXP20X_PWR_INPUT_STATUS);
356	if (pwr_stat < 0) {
357		dev_err(&info->pdev->dev,
358			"PWR STAT read failed:%d\n", pwr_stat);
359		return;
360	}
361	ret = pmic_read_adc_val("axp288-chrg-curr", &charge, info);
362	if (ret < 0) {
363		dev_err(&info->pdev->dev,
364			"ADC charge current read failed:%d\n", ret);
365		return;
366	}
367	ret = pmic_read_adc_val("axp288-chrg-d-curr", &discharge, info);
368	if (ret < 0) {
369		dev_err(&info->pdev->dev,
370			"ADC discharge current read failed:%d\n", ret);
371		return;
372	}
373
374	if (charge > 0)
375		info->status = POWER_SUPPLY_STATUS_CHARGING;
376	else if (discharge > 0)
377		info->status = POWER_SUPPLY_STATUS_DISCHARGING;
378	else {
379		if (pwr_stat & CHRG_STAT_BAT_PRESENT)
380			info->status = POWER_SUPPLY_STATUS_FULL;
381		else
382			info->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
383	}
384}
385
386static int fuel_gauge_get_vbatt(struct axp288_fg_info *info, int *vbatt)
387{
388	int ret = 0, raw_val;
389
390	ret = pmic_read_adc_val("axp288-batt-volt", &raw_val, info);
391	if (ret < 0)
392		goto vbatt_read_fail;
393
394	*vbatt = VOLTAGE_FROM_ADC(raw_val);
395vbatt_read_fail:
396	return ret;
397}
398
399static int fuel_gauge_get_current(struct axp288_fg_info *info, int *cur)
400{
401	int ret, value = 0;
402	int charge, discharge;
403
404	ret = pmic_read_adc_val("axp288-chrg-curr", &charge, info);
405	if (ret < 0)
406		goto current_read_fail;
407	ret = pmic_read_adc_val("axp288-chrg-d-curr", &discharge, info);
408	if (ret < 0)
409		goto current_read_fail;
410
411	if (charge > 0)
412		value = charge;
413	else if (discharge > 0)
414		value = -1 * discharge;
415
416	*cur = value;
417current_read_fail:
418	return ret;
419}
420
421static int temp_to_adc(struct axp288_fg_info *info, int tval)
422{
423	int rntc = 0, i, ret, adc_val;
424	int rmin, rmax, tmin, tmax;
425	int tcsz = info->pdata->tcsz;
426
427	/* get the Rntc resitance value for this temp */
428	if (tval > info->pdata->thermistor_curve[0][1]) {
429		rntc = info->pdata->thermistor_curve[0][0];
430	} else if (tval <= info->pdata->thermistor_curve[tcsz-1][1]) {
431		rntc = info->pdata->thermistor_curve[tcsz-1][0];
432	} else {
433		for (i = 1; i < tcsz; i++) {
434			if (tval > info->pdata->thermistor_curve[i][1]) {
435				rmin = info->pdata->thermistor_curve[i-1][0];
436				rmax = info->pdata->thermistor_curve[i][0];
437				tmin = info->pdata->thermistor_curve[i-1][1];
438				tmax = info->pdata->thermistor_curve[i][1];
439				rntc = rmin + ((rmax - rmin) *
440					(tval - tmin) / (tmax - tmin));
441				break;
442			}
443		}
444	}
445
446	/* we need the current to calculate the proper adc voltage */
447	ret = fuel_gauge_reg_readb(info, AXP20X_ADC_RATE);
448	if (ret < 0) {
449		dev_err(&info->pdev->dev, "%s:read err:%d\n", __func__, ret);
450		ret = 0x30;
451	}
452
453	/*
454	 * temperature is proportional to NTS thermistor resistance
455	 * ADC_RATE[5-4] determines current, 00=20uA,01=40uA,10=60uA,11=80uA
456	 * [12-bit ADC VAL] = R_NTC(Ω) * current / 800
457	 */
458	adc_val = rntc * (20 + (20 * ((ret >> 4) & 0x3))) / 800;
459
460	return adc_val;
461}
462
463static int adc_to_temp(struct axp288_fg_info *info, int adc_val)
464{
465	int ret, r, i, tval = 0;
466	int rmin, rmax, tmin, tmax;
467	int tcsz = info->pdata->tcsz;
468
469	ret = fuel_gauge_reg_readb(info, AXP20X_ADC_RATE);
470	if (ret < 0) {
471		dev_err(&info->pdev->dev, "%s:read err:%d\n", __func__, ret);
472		ret = 0x30;
473	}
474
475	/*
476	 * temperature is proportional to NTS thermistor resistance
477	 * ADC_RATE[5-4] determines current, 00=20uA,01=40uA,10=60uA,11=80uA
478	 * R_NTC(Ω) = [12-bit ADC VAL] * 800 / current
479	 */
480	r = adc_val * 800 / (20 + (20 * ((ret >> 4) & 0x3)));
481
482	if (r < info->pdata->thermistor_curve[0][0]) {
483		tval = info->pdata->thermistor_curve[0][1];
484	} else if (r >= info->pdata->thermistor_curve[tcsz-1][0]) {
485		tval = info->pdata->thermistor_curve[tcsz-1][1];
486	} else {
487		for (i = 1; i < tcsz; i++) {
488			if (r < info->pdata->thermistor_curve[i][0]) {
489				rmin = info->pdata->thermistor_curve[i-1][0];
490				rmax = info->pdata->thermistor_curve[i][0];
491				tmin = info->pdata->thermistor_curve[i-1][1];
492				tmax = info->pdata->thermistor_curve[i][1];
493				tval = tmin + ((tmax - tmin) *
494					(r - rmin) / (rmax - rmin));
495				break;
496			}
497		}
498	}
499
500	return tval;
501}
502
503static int fuel_gauge_get_btemp(struct axp288_fg_info *info, int *btemp)
504{
505	int ret, raw_val = 0;
506
507	ret = pmic_read_adc_val("axp288-batt-temp", &raw_val, info);
508	if (ret < 0)
509		goto temp_read_fail;
510
511	*btemp = adc_to_temp(info, raw_val);
512
513temp_read_fail:
514	return ret;
515}
516
517static int fuel_gauge_get_vocv(struct axp288_fg_info *info, int *vocv)
518{
519	int ret, value;
520
521	/* 12-bit data value, upper 8 in OCVH, lower 4 in OCVL */
522	ret = fuel_gauge_reg_readb(info, AXP288_FG_OCVH_REG);
523	if (ret < 0)
524		goto vocv_read_fail;
525	value = ret << 4;
526
527	ret = fuel_gauge_reg_readb(info, AXP288_FG_OCVL_REG);
528	if (ret < 0)
529		goto vocv_read_fail;
530	value |= (ret & 0xf);
531
532	*vocv = VOLTAGE_FROM_ADC(value);
533vocv_read_fail:
534	return ret;
535}
536
537static int fuel_gauge_battery_health(struct axp288_fg_info *info)
538{
539	int temp, vocv;
540	int ret, health = POWER_SUPPLY_HEALTH_UNKNOWN;
541
542	ret = fuel_gauge_get_btemp(info, &temp);
543	if (ret < 0)
544		goto health_read_fail;
545
546	ret = fuel_gauge_get_vocv(info, &vocv);
547	if (ret < 0)
548		goto health_read_fail;
549
550	if (vocv > info->pdata->max_volt)
551		health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
552	else if (temp > info->pdata->max_temp)
553		health = POWER_SUPPLY_HEALTH_OVERHEAT;
554	else if (temp < info->pdata->min_temp)
555		health = POWER_SUPPLY_HEALTH_COLD;
556	else if (vocv < info->pdata->min_volt)
557		health = POWER_SUPPLY_HEALTH_DEAD;
558	else
559		health = POWER_SUPPLY_HEALTH_GOOD;
560
561health_read_fail:
562	return health;
563}
564
565static int fuel_gauge_set_high_btemp_alert(struct axp288_fg_info *info)
566{
567	int ret, adc_val;
568
569	/* program temperature threshold as 1/16 ADC value */
570	adc_val = temp_to_adc(info, info->pdata->max_temp);
571	ret = fuel_gauge_reg_writeb(info, AXP20X_V_HTF_DISCHRG, adc_val >> 4);
572
573	return ret;
574}
575
576static int fuel_gauge_set_low_btemp_alert(struct axp288_fg_info *info)
577{
578	int ret, adc_val;
579
580	/* program temperature threshold as 1/16 ADC value */
581	adc_val = temp_to_adc(info, info->pdata->min_temp);
582	ret = fuel_gauge_reg_writeb(info, AXP20X_V_LTF_DISCHRG, adc_val >> 4);
583
584	return ret;
585}
586
587static int fuel_gauge_get_property(struct power_supply *ps,
588		enum power_supply_property prop,
589		union power_supply_propval *val)
590{
591	struct axp288_fg_info *info = power_supply_get_drvdata(ps);
592	int ret = 0, value;
593
594	mutex_lock(&info->lock);
595	switch (prop) {
596	case POWER_SUPPLY_PROP_STATUS:
597		fuel_gauge_get_status(info);
598		val->intval = info->status;
599		break;
600	case POWER_SUPPLY_PROP_HEALTH:
601		val->intval = fuel_gauge_battery_health(info);
602		break;
603	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
604		ret = fuel_gauge_get_vbatt(info, &value);
605		if (ret < 0)
606			goto fuel_gauge_read_err;
607		val->intval = PROP_VOLT(value);
608		break;
609	case POWER_SUPPLY_PROP_VOLTAGE_OCV:
610		ret = fuel_gauge_get_vocv(info, &value);
611		if (ret < 0)
612			goto fuel_gauge_read_err;
613		val->intval = PROP_VOLT(value);
614		break;
615	case POWER_SUPPLY_PROP_CURRENT_NOW:
616		ret = fuel_gauge_get_current(info, &value);
617		if (ret < 0)
618			goto fuel_gauge_read_err;
619		val->intval = PROP_CURR(value);
620		break;
621	case POWER_SUPPLY_PROP_PRESENT:
622		ret = fuel_gauge_reg_readb(info, AXP20X_PWR_OP_MODE);
623		if (ret < 0)
624			goto fuel_gauge_read_err;
625
626		if (ret & CHRG_STAT_BAT_PRESENT)
627			val->intval = 1;
628		else
629			val->intval = 0;
630		break;
631	case POWER_SUPPLY_PROP_CAPACITY:
632		ret = fuel_gauge_reg_readb(info, AXP20X_FG_RES);
633		if (ret < 0)
634			goto fuel_gauge_read_err;
635
636		if (!(ret & FG_REP_CAP_VALID))
637			dev_err(&info->pdev->dev,
638				"capacity measurement not valid\n");
639		val->intval = (ret & FG_REP_CAP_VAL_MASK);
640		break;
641	case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
642		ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG);
643		if (ret < 0)
644			goto fuel_gauge_read_err;
645		val->intval = (ret & 0x0f);
646		break;
647	case POWER_SUPPLY_PROP_TEMP:
648		ret = fuel_gauge_get_btemp(info, &value);
649		if (ret < 0)
650			goto fuel_gauge_read_err;
651		val->intval = PROP_TEMP(value);
652		break;
653	case POWER_SUPPLY_PROP_TEMP_MAX:
654	case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
655		val->intval = PROP_TEMP(info->pdata->max_temp);
656		break;
657	case POWER_SUPPLY_PROP_TEMP_MIN:
658	case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
659		val->intval = PROP_TEMP(info->pdata->min_temp);
660		break;
661	case POWER_SUPPLY_PROP_TECHNOLOGY:
662		val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
663		break;
664	case POWER_SUPPLY_PROP_CHARGE_NOW:
665		ret = fuel_gauge_reg_readb(info, AXP288_FG_CC_MTR1_REG);
666		if (ret < 0)
667			goto fuel_gauge_read_err;
668
669		value = (ret & FG_CC_MTR1_VAL_MASK) << 8;
670		ret = fuel_gauge_reg_readb(info, AXP288_FG_CC_MTR0_REG);
671		if (ret < 0)
672			goto fuel_gauge_read_err;
673		value |= (ret & FG_CC_MTR0_VAL_MASK);
674		val->intval = value * FG_DES_CAP_RES_LSB;
675		break;
676	case POWER_SUPPLY_PROP_CHARGE_FULL:
677		ret = fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP1_REG);
678		if (ret < 0)
679			goto fuel_gauge_read_err;
680
681		value = (ret & FG_DES_CAP1_VAL_MASK) << 8;
682		ret = fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP0_REG);
683		if (ret < 0)
684			goto fuel_gauge_read_err;
685		value |= (ret & FG_DES_CAP0_VAL_MASK);
686		val->intval = value * FG_DES_CAP_RES_LSB;
687		break;
688	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
689		val->intval = PROP_CURR(info->pdata->design_cap);
690		break;
691	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
692		val->intval = PROP_VOLT(info->pdata->max_volt);
693		break;
694	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
695		val->intval = PROP_VOLT(info->pdata->min_volt);
696		break;
697	case POWER_SUPPLY_PROP_MODEL_NAME:
698		val->strval = info->pdata->battid;
699		break;
700	default:
701		mutex_unlock(&info->lock);
702		return -EINVAL;
703	}
704
705	mutex_unlock(&info->lock);
706	return 0;
707
708fuel_gauge_read_err:
709	mutex_unlock(&info->lock);
710	return ret;
711}
712
713static int fuel_gauge_set_property(struct power_supply *ps,
714		enum power_supply_property prop,
715		const union power_supply_propval *val)
716{
717	struct axp288_fg_info *info = power_supply_get_drvdata(ps);
718	int ret = 0;
719
720	mutex_lock(&info->lock);
721	switch (prop) {
722	case POWER_SUPPLY_PROP_STATUS:
723		info->status = val->intval;
724		break;
725	case POWER_SUPPLY_PROP_TEMP_MIN:
726	case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
727		if ((val->intval < PD_DEF_MIN_TEMP) ||
728			(val->intval > PD_DEF_MAX_TEMP)) {
729			ret = -EINVAL;
730			break;
731		}
732		info->pdata->min_temp = UNPROP_TEMP(val->intval);
733		ret = fuel_gauge_set_low_btemp_alert(info);
734		if (ret < 0)
735			dev_err(&info->pdev->dev,
736				"temp alert min set fail:%d\n", ret);
737		break;
738	case POWER_SUPPLY_PROP_TEMP_MAX:
739	case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
740		if ((val->intval < PD_DEF_MIN_TEMP) ||
741			(val->intval > PD_DEF_MAX_TEMP)) {
742			ret = -EINVAL;
743			break;
744		}
745		info->pdata->max_temp = UNPROP_TEMP(val->intval);
746		ret = fuel_gauge_set_high_btemp_alert(info);
747		if (ret < 0)
748			dev_err(&info->pdev->dev,
749				"temp alert max set fail:%d\n", ret);
750		break;
751	case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
752		if ((val->intval < 0) || (val->intval > 15)) {
753			ret = -EINVAL;
754			break;
755		}
756		ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG);
757		if (ret < 0)
758			break;
759		ret &= 0xf0;
760		ret |= (val->intval & 0xf);
761		ret = fuel_gauge_reg_writeb(info, AXP288_FG_LOW_CAP_REG, ret);
762		break;
763	default:
764		ret = -EINVAL;
765		break;
766	}
767
768	mutex_unlock(&info->lock);
769	return ret;
770}
771
772static int fuel_gauge_property_is_writeable(struct power_supply *psy,
773	enum power_supply_property psp)
774{
775	int ret;
776
777	switch (psp) {
778	case POWER_SUPPLY_PROP_STATUS:
779	case POWER_SUPPLY_PROP_TEMP_MIN:
780	case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
781	case POWER_SUPPLY_PROP_TEMP_MAX:
782	case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
783	case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
784		ret = 1;
785		break;
786	default:
787		ret = 0;
788	}
789
790	return ret;
791}
792
793static void fuel_gauge_status_monitor(struct work_struct *work)
794{
795	struct axp288_fg_info *info = container_of(work,
796		struct axp288_fg_info, status_monitor.work);
797
798	fuel_gauge_get_status(info);
799	power_supply_changed(info->bat);
800	schedule_delayed_work(&info->status_monitor, STATUS_MON_DELAY_JIFFIES);
801}
802
803static irqreturn_t fuel_gauge_thread_handler(int irq, void *dev)
804{
805	struct axp288_fg_info *info = dev;
806	int i;
807
808	for (i = 0; i < AXP288_FG_INTR_NUM; i++) {
809		if (info->irq[i] == irq)
810			break;
811	}
812
813	if (i >= AXP288_FG_INTR_NUM) {
814		dev_warn(&info->pdev->dev, "spurious interrupt!!\n");
815		return IRQ_NONE;
816	}
817
818	switch (i) {
819	case QWBTU_IRQ:
820		dev_info(&info->pdev->dev,
821			"Quit Battery under temperature in work mode IRQ (QWBTU)\n");
822		break;
823	case WBTU_IRQ:
824		dev_info(&info->pdev->dev,
825			"Battery under temperature in work mode IRQ (WBTU)\n");
826		break;
827	case QWBTO_IRQ:
828		dev_info(&info->pdev->dev,
829			"Quit Battery over temperature in work mode IRQ (QWBTO)\n");
830		break;
831	case WBTO_IRQ:
832		dev_info(&info->pdev->dev,
833			"Battery over temperature in work mode IRQ (WBTO)\n");
834		break;
835	case WL2_IRQ:
836		dev_info(&info->pdev->dev, "Low Batt Warning(2) INTR\n");
837		break;
838	case WL1_IRQ:
839		dev_info(&info->pdev->dev, "Low Batt Warning(1) INTR\n");
840		break;
841	default:
842		dev_warn(&info->pdev->dev, "Spurious Interrupt!!!\n");
843	}
844
845	power_supply_changed(info->bat);
846	return IRQ_HANDLED;
847}
848
849static void fuel_gauge_external_power_changed(struct power_supply *psy)
850{
851	struct axp288_fg_info *info = power_supply_get_drvdata(psy);
852
853	power_supply_changed(info->bat);
854}
855
856static const struct power_supply_desc fuel_gauge_desc = {
857	.name			= DEV_NAME,
858	.type			= POWER_SUPPLY_TYPE_BATTERY,
859	.properties		= fuel_gauge_props,
860	.num_properties		= ARRAY_SIZE(fuel_gauge_props),
861	.get_property		= fuel_gauge_get_property,
862	.set_property		= fuel_gauge_set_property,
863	.property_is_writeable	= fuel_gauge_property_is_writeable,
864	.external_power_changed	= fuel_gauge_external_power_changed,
865};
866
867static int fuel_gauge_set_lowbatt_thresholds(struct axp288_fg_info *info)
868{
869	int ret;
870	u8 reg_val;
871
872	ret = fuel_gauge_reg_readb(info, AXP20X_FG_RES);
873	if (ret < 0) {
874		dev_err(&info->pdev->dev, "%s:read err:%d\n", __func__, ret);
875		return ret;
876	}
877	ret = (ret & FG_REP_CAP_VAL_MASK);
878
879	if (ret > FG_LOW_CAP_WARN_THR)
880		reg_val = FG_LOW_CAP_WARN_THR;
881	else if (ret > FG_LOW_CAP_CRIT_THR)
882		reg_val = FG_LOW_CAP_CRIT_THR;
883	else
884		reg_val = FG_LOW_CAP_SHDN_THR;
885
886	reg_val |= FG_LOW_CAP_THR1_VAL;
887	ret = fuel_gauge_reg_writeb(info, AXP288_FG_LOW_CAP_REG, reg_val);
888	if (ret < 0)
889		dev_err(&info->pdev->dev, "%s:write err:%d\n", __func__, ret);
890
891	return ret;
892}
893
894static int fuel_gauge_program_vbatt_full(struct axp288_fg_info *info)
895{
896	int ret;
897	u8 val;
898
899	ret = fuel_gauge_reg_readb(info, AXP20X_CHRG_CTRL1);
900	if (ret < 0)
901		goto fg_prog_ocv_fail;
902	else
903		val = (ret & ~CHRG_CCCV_CV_MASK);
904
905	switch (info->pdata->max_volt) {
906	case CV_4100:
907		val |= (CHRG_CCCV_CV_4100MV << CHRG_CCCV_CV_BIT_POS);
908		break;
909	case CV_4150:
910		val |= (CHRG_CCCV_CV_4150MV << CHRG_CCCV_CV_BIT_POS);
911		break;
912	case CV_4200:
913		val |= (CHRG_CCCV_CV_4200MV << CHRG_CCCV_CV_BIT_POS);
914		break;
915	case CV_4350:
916		val |= (CHRG_CCCV_CV_4350MV << CHRG_CCCV_CV_BIT_POS);
917		break;
918	default:
919		val |= (CHRG_CCCV_CV_4200MV << CHRG_CCCV_CV_BIT_POS);
920		break;
921	}
922
923	ret = fuel_gauge_reg_writeb(info, AXP20X_CHRG_CTRL1, val);
924fg_prog_ocv_fail:
925	return ret;
926}
927
928static int fuel_gauge_program_design_cap(struct axp288_fg_info *info)
929{
930	int ret;
931
932	ret = fuel_gauge_reg_writeb(info,
933		AXP288_FG_DES_CAP1_REG, info->pdata->cap1);
934	if (ret < 0)
935		goto fg_prog_descap_fail;
936
937	ret = fuel_gauge_reg_writeb(info,
938		AXP288_FG_DES_CAP0_REG, info->pdata->cap0);
939
940fg_prog_descap_fail:
941	return ret;
942}
943
944static int fuel_gauge_program_ocv_curve(struct axp288_fg_info *info)
945{
946	int ret = 0, i;
947
948	for (i = 0; i < OCV_CURVE_SIZE; i++) {
949		ret = fuel_gauge_reg_writeb(info,
950			AXP288_FG_OCV_CURVE_REG + i, info->pdata->ocv_curve[i]);
951		if (ret < 0)
952			goto fg_prog_ocv_fail;
953	}
954
955fg_prog_ocv_fail:
956	return ret;
957}
958
959static int fuel_gauge_program_rdc_vals(struct axp288_fg_info *info)
960{
961	int ret;
962
963	ret = fuel_gauge_reg_writeb(info,
964		AXP288_FG_RDC1_REG, info->pdata->rdc1);
965	if (ret < 0)
966		goto fg_prog_ocv_fail;
967
968	ret = fuel_gauge_reg_writeb(info,
969		AXP288_FG_RDC0_REG, info->pdata->rdc0);
970
971fg_prog_ocv_fail:
972	return ret;
973}
974
975static void fuel_gauge_init_config_regs(struct axp288_fg_info *info)
976{
977	int ret;
978
979	/*
980	 * check if the config data is already
981	 * programmed and if so just return.
982	 */
983
984	ret = fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP1_REG);
985	if (ret < 0) {
986		dev_warn(&info->pdev->dev, "CAP1 reg read err!!\n");
987	} else if (!(ret & FG_DES_CAP1_VALID)) {
988		dev_info(&info->pdev->dev, "FG data needs to be initialized\n");
989	} else {
990		dev_info(&info->pdev->dev, "FG data is already initialized\n");
991		return;
992	}
993
994	ret = fuel_gauge_program_vbatt_full(info);
995	if (ret < 0)
996		dev_err(&info->pdev->dev, "set vbatt full fail:%d\n", ret);
997
998	ret = fuel_gauge_program_design_cap(info);
999	if (ret < 0)
1000		dev_err(&info->pdev->dev, "set design cap fail:%d\n", ret);
1001
1002	ret = fuel_gauge_program_rdc_vals(info);
1003	if (ret < 0)
1004		dev_err(&info->pdev->dev, "set rdc fail:%d\n", ret);
1005
1006	ret = fuel_gauge_program_ocv_curve(info);
1007	if (ret < 0)
1008		dev_err(&info->pdev->dev, "set ocv curve fail:%d\n", ret);
1009
1010	ret = fuel_gauge_set_lowbatt_thresholds(info);
1011	if (ret < 0)
1012		dev_err(&info->pdev->dev, "lowbatt thr set fail:%d\n", ret);
1013
1014	ret = fuel_gauge_reg_writeb(info, AXP20X_CC_CTRL, 0xef);
1015	if (ret < 0)
1016		dev_err(&info->pdev->dev, "gauge cntl set fail:%d\n", ret);
1017}
1018
1019static void fuel_gauge_init_irq(struct axp288_fg_info *info)
1020{
1021	int ret, i, pirq;
1022
1023	for (i = 0; i < AXP288_FG_INTR_NUM; i++) {
1024		pirq = platform_get_irq(info->pdev, i);
1025		info->irq[i] = regmap_irq_get_virq(info->regmap_irqc, pirq);
1026		if (info->irq[i] < 0) {
1027			dev_warn(&info->pdev->dev,
1028				"regmap_irq get virq failed for IRQ %d: %d\n",
1029				pirq, info->irq[i]);
1030			info->irq[i] = -1;
1031			goto intr_failed;
1032		}
1033		ret = request_threaded_irq(info->irq[i],
1034				NULL, fuel_gauge_thread_handler,
1035				IRQF_ONESHOT, DEV_NAME, info);
1036		if (ret) {
1037			dev_warn(&info->pdev->dev,
1038				"request irq failed for IRQ %d: %d\n",
1039				pirq, info->irq[i]);
1040			info->irq[i] = -1;
1041			goto intr_failed;
1042		} else {
1043			dev_info(&info->pdev->dev, "HW IRQ %d -> VIRQ %d\n",
1044				pirq, info->irq[i]);
1045		}
1046	}
1047	return;
1048
1049intr_failed:
1050	for (; i > 0; i--) {
1051		free_irq(info->irq[i - 1], info);
1052		info->irq[i - 1] = -1;
1053	}
1054}
1055
1056static void fuel_gauge_init_hw_regs(struct axp288_fg_info *info)
1057{
1058	int ret;
1059	unsigned int val;
1060
1061	ret = fuel_gauge_set_high_btemp_alert(info);
1062	if (ret < 0)
1063		dev_err(&info->pdev->dev, "high batt temp set fail:%d\n", ret);
1064
1065	ret = fuel_gauge_set_low_btemp_alert(info);
1066	if (ret < 0)
1067		dev_err(&info->pdev->dev, "low batt temp set fail:%d\n", ret);
1068
1069	/* enable interrupts */
1070	val = fuel_gauge_reg_readb(info, AXP20X_IRQ3_EN);
1071	val |= TEMP_IRQ_CFG_MASK;
1072	fuel_gauge_reg_writeb(info, AXP20X_IRQ3_EN, val);
1073
1074	val = fuel_gauge_reg_readb(info, AXP20X_IRQ4_EN);
1075	val |= FG_IRQ_CFG_LOWBATT_MASK;
1076	val = fuel_gauge_reg_writeb(info, AXP20X_IRQ4_EN, val);
1077}
1078
1079static int axp288_fuel_gauge_probe(struct platform_device *pdev)
1080{
1081	int ret = 0;
1082	struct axp288_fg_info *info;
1083	struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
1084	struct power_supply_config psy_cfg = {};
1085
1086	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
1087	if (!info)
1088		return -ENOMEM;
1089
1090	info->pdev = pdev;
1091	info->regmap = axp20x->regmap;
1092	info->regmap_irqc = axp20x->regmap_irqc;
1093	info->status = POWER_SUPPLY_STATUS_UNKNOWN;
1094	info->pdata = pdev->dev.platform_data;
1095	if (!info->pdata)
1096		return -ENODEV;
1097
1098	platform_set_drvdata(pdev, info);
1099
1100	mutex_init(&info->lock);
1101	INIT_DELAYED_WORK(&info->status_monitor, fuel_gauge_status_monitor);
1102
1103	psy_cfg.drv_data = info;
1104	info->bat = power_supply_register(&pdev->dev, &fuel_gauge_desc, &psy_cfg);
1105	if (IS_ERR(info->bat)) {
1106		ret = PTR_ERR(info->bat);
1107		dev_err(&pdev->dev, "failed to register battery: %d\n", ret);
1108		return ret;
1109	}
1110
1111	fuel_gauge_create_debugfs(info);
1112	fuel_gauge_init_config_regs(info);
1113	fuel_gauge_init_irq(info);
1114	fuel_gauge_init_hw_regs(info);
1115	schedule_delayed_work(&info->status_monitor, STATUS_MON_DELAY_JIFFIES);
1116
1117	return ret;
1118}
1119
1120static struct platform_device_id axp288_fg_id_table[] = {
1121	{ .name = DEV_NAME },
1122	{},
1123};
1124
1125static int axp288_fuel_gauge_remove(struct platform_device *pdev)
1126{
1127	struct axp288_fg_info *info = platform_get_drvdata(pdev);
1128	int i;
1129
1130	cancel_delayed_work_sync(&info->status_monitor);
1131	power_supply_unregister(info->bat);
1132	fuel_gauge_remove_debugfs(info);
1133
1134	for (i = 0; i < AXP288_FG_INTR_NUM; i++)
1135		if (info->irq[i] >= 0)
1136			free_irq(info->irq[i], info);
1137
1138	return 0;
1139}
1140
1141static struct platform_driver axp288_fuel_gauge_driver = {
1142	.probe = axp288_fuel_gauge_probe,
1143	.remove = axp288_fuel_gauge_remove,
1144	.id_table = axp288_fg_id_table,
1145	.driver = {
1146		.name = DEV_NAME,
1147	},
1148};
1149
1150module_platform_driver(axp288_fuel_gauge_driver);
1151
1152MODULE_AUTHOR("Ramakrishna Pallala <ramakrishna.pallala@intel.com>");
1153MODULE_AUTHOR("Todd Brandt <todd.e.brandt@linux.intel.com>");
1154MODULE_DESCRIPTION("Xpower AXP288 Fuel Gauge Driver");
1155MODULE_LICENSE("GPL");
1156