GNU Linux-libre 4.14.262-gnu1
[releases.git] / drivers / power / supply / axp288_fuel_gauge.c
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 #include <asm/unaligned.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 FG_CNTL_OCV_ADJ_STAT            (1 << 2)
54 #define FG_CNTL_OCV_ADJ_EN                      (1 << 3)
55 #define FG_CNTL_CAP_ADJ_STAT            (1 << 4)
56 #define FG_CNTL_CAP_ADJ_EN                      (1 << 5)
57 #define FG_CNTL_CC_EN                           (1 << 6)
58 #define FG_CNTL_GAUGE_EN                        (1 << 7)
59
60 #define FG_15BIT_WORD_VALID                     (1 << 15)
61 #define FG_15BIT_VAL_MASK                       0x7fff
62
63 #define FG_REP_CAP_VALID                        (1 << 7)
64 #define FG_REP_CAP_VAL_MASK                     0x7F
65
66 #define FG_DES_CAP1_VALID                       (1 << 7)
67 #define FG_DES_CAP_RES_LSB                      1456    /* 1.456mAhr */
68
69 #define FG_DES_CC_RES_LSB                       1456    /* 1.456mAhr */
70
71 #define FG_OCV_CAP_VALID                        (1 << 7)
72 #define FG_OCV_CAP_VAL_MASK                     0x7F
73 #define FG_CC_CAP_VALID                         (1 << 7)
74 #define FG_CC_CAP_VAL_MASK                      0x7F
75
76 #define FG_LOW_CAP_THR1_MASK            0xf0    /* 5% tp 20% */
77 #define FG_LOW_CAP_THR1_VAL                     0xa0    /* 15 perc */
78 #define FG_LOW_CAP_THR2_MASK            0x0f    /* 0% to 15% */
79 #define FG_LOW_CAP_WARN_THR                     14  /* 14 perc */
80 #define FG_LOW_CAP_CRIT_THR                     4   /* 4 perc */
81 #define FG_LOW_CAP_SHDN_THR                     0   /* 0 perc */
82
83 #define STATUS_MON_DELAY_JIFFIES    (HZ * 60)   /*60 sec */
84 #define NR_RETRY_CNT    3
85 #define DEV_NAME        "axp288_fuel_gauge"
86
87 /* 1.1mV per LSB expressed in uV */
88 #define VOLTAGE_FROM_ADC(a)                     ((a * 11) / 10)
89 /* properties converted to uV, uA */
90 #define PROP_VOLT(a)            ((a) * 1000)
91 #define PROP_CURR(a)            ((a) * 1000)
92
93 #define AXP288_FG_INTR_NUM      6
94 enum {
95         QWBTU_IRQ = 0,
96         WBTU_IRQ,
97         QWBTO_IRQ,
98         WBTO_IRQ,
99         WL2_IRQ,
100         WL1_IRQ,
101 };
102
103 struct axp288_fg_info {
104         struct platform_device *pdev;
105         struct regmap *regmap;
106         struct regmap_irq_chip_data *regmap_irqc;
107         int irq[AXP288_FG_INTR_NUM];
108         struct power_supply *bat;
109         struct mutex lock;
110         int status;
111         int max_volt;
112         struct delayed_work status_monitor;
113         struct dentry *debug_file;
114 };
115
116 static enum power_supply_property fuel_gauge_props[] = {
117         POWER_SUPPLY_PROP_STATUS,
118         POWER_SUPPLY_PROP_PRESENT,
119         POWER_SUPPLY_PROP_HEALTH,
120         POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
121         POWER_SUPPLY_PROP_VOLTAGE_NOW,
122         POWER_SUPPLY_PROP_VOLTAGE_OCV,
123         POWER_SUPPLY_PROP_CURRENT_NOW,
124         POWER_SUPPLY_PROP_CAPACITY,
125         POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN,
126         POWER_SUPPLY_PROP_TECHNOLOGY,
127         POWER_SUPPLY_PROP_CHARGE_FULL,
128         POWER_SUPPLY_PROP_CHARGE_NOW,
129 };
130
131 static int fuel_gauge_reg_readb(struct axp288_fg_info *info, int reg)
132 {
133         int ret, i;
134         unsigned int val;
135
136         for (i = 0; i < NR_RETRY_CNT; i++) {
137                 ret = regmap_read(info->regmap, reg, &val);
138                 if (ret == -EBUSY)
139                         continue;
140                 else
141                         break;
142         }
143
144         if (ret < 0) {
145                 dev_err(&info->pdev->dev, "Error reading reg 0x%02x err: %d\n", reg, ret);
146                 return ret;
147         }
148
149         return val;
150 }
151
152 static int fuel_gauge_reg_writeb(struct axp288_fg_info *info, int reg, u8 val)
153 {
154         int ret;
155
156         ret = regmap_write(info->regmap, reg, (unsigned int)val);
157
158         if (ret < 0)
159                 dev_err(&info->pdev->dev, "Error writing reg 0x%02x err: %d\n", reg, ret);
160
161         return ret;
162 }
163
164 static int fuel_gauge_read_15bit_word(struct axp288_fg_info *info, int reg)
165 {
166         unsigned char buf[2];
167         int ret;
168
169         ret = regmap_bulk_read(info->regmap, reg, buf, 2);
170         if (ret < 0) {
171                 dev_err(&info->pdev->dev, "Error reading reg 0x%02x err: %d\n",
172                         reg, ret);
173                 return ret;
174         }
175
176         ret = get_unaligned_be16(buf);
177         if (!(ret & FG_15BIT_WORD_VALID)) {
178                 dev_err(&info->pdev->dev, "Error reg 0x%02x contents not valid\n",
179                         reg);
180                 return -ENXIO;
181         }
182
183         return ret & FG_15BIT_VAL_MASK;
184 }
185
186 static int fuel_gauge_read_12bit_word(struct axp288_fg_info *info, int reg)
187 {
188         unsigned char buf[2];
189         int ret;
190
191         ret = regmap_bulk_read(info->regmap, reg, buf, 2);
192         if (ret < 0) {
193                 dev_err(&info->pdev->dev, "Error reading reg 0x%02x err: %d\n",
194                         reg, ret);
195                 return ret;
196         }
197
198         /* 12-bit data values have upper 8 bits in buf[0], lower 4 in buf[1] */
199         return (buf[0] << 4) | ((buf[1] >> 4) & 0x0f);
200 }
201
202 static int pmic_read_adc_val(const char *name, int *raw_val,
203                 struct axp288_fg_info *info)
204 {
205         int ret, val = 0;
206         struct iio_channel *indio_chan;
207
208         indio_chan = iio_channel_get(NULL, name);
209         if (IS_ERR_OR_NULL(indio_chan)) {
210                 ret = PTR_ERR(indio_chan);
211                 goto exit;
212         }
213         ret = iio_read_channel_raw(indio_chan, &val);
214         if (ret < 0) {
215                 dev_err(&info->pdev->dev,
216                         "IIO channel read error: %x, %x\n", ret, val);
217                 goto err_exit;
218         }
219
220         dev_dbg(&info->pdev->dev, "adc raw val=%x\n", val);
221         *raw_val = val;
222
223 err_exit:
224         iio_channel_release(indio_chan);
225 exit:
226         return ret;
227 }
228
229 #ifdef CONFIG_DEBUG_FS
230 static int fuel_gauge_debug_show(struct seq_file *s, void *data)
231 {
232         struct axp288_fg_info *info = s->private;
233         int raw_val, ret;
234
235         seq_printf(s, " PWR_STATUS[%02x] : %02x\n",
236                 AXP20X_PWR_INPUT_STATUS,
237                 fuel_gauge_reg_readb(info, AXP20X_PWR_INPUT_STATUS));
238         seq_printf(s, "PWR_OP_MODE[%02x] : %02x\n",
239                 AXP20X_PWR_OP_MODE,
240                 fuel_gauge_reg_readb(info, AXP20X_PWR_OP_MODE));
241         seq_printf(s, " CHRG_CTRL1[%02x] : %02x\n",
242                 AXP20X_CHRG_CTRL1,
243                 fuel_gauge_reg_readb(info, AXP20X_CHRG_CTRL1));
244         seq_printf(s, "       VLTF[%02x] : %02x\n",
245                 AXP20X_V_LTF_DISCHRG,
246                 fuel_gauge_reg_readb(info, AXP20X_V_LTF_DISCHRG));
247         seq_printf(s, "       VHTF[%02x] : %02x\n",
248                 AXP20X_V_HTF_DISCHRG,
249                 fuel_gauge_reg_readb(info, AXP20X_V_HTF_DISCHRG));
250         seq_printf(s, "    CC_CTRL[%02x] : %02x\n",
251                 AXP20X_CC_CTRL,
252                 fuel_gauge_reg_readb(info, AXP20X_CC_CTRL));
253         seq_printf(s, "BATTERY CAP[%02x] : %02x\n",
254                 AXP20X_FG_RES,
255                 fuel_gauge_reg_readb(info, AXP20X_FG_RES));
256         seq_printf(s, "    FG_RDC1[%02x] : %02x\n",
257                 AXP288_FG_RDC1_REG,
258                 fuel_gauge_reg_readb(info, AXP288_FG_RDC1_REG));
259         seq_printf(s, "    FG_RDC0[%02x] : %02x\n",
260                 AXP288_FG_RDC0_REG,
261                 fuel_gauge_reg_readb(info, AXP288_FG_RDC0_REG));
262         seq_printf(s, "     FG_OCV[%02x] : %04x\n",
263                 AXP288_FG_OCVH_REG,
264                 fuel_gauge_read_12bit_word(info, AXP288_FG_OCVH_REG));
265         seq_printf(s, " FG_DES_CAP[%02x] : %04x\n",
266                 AXP288_FG_DES_CAP1_REG,
267                 fuel_gauge_read_15bit_word(info, AXP288_FG_DES_CAP1_REG));
268         seq_printf(s, "  FG_CC_MTR[%02x] : %04x\n",
269                 AXP288_FG_CC_MTR1_REG,
270                 fuel_gauge_read_15bit_word(info, AXP288_FG_CC_MTR1_REG));
271         seq_printf(s, " FG_OCV_CAP[%02x] : %02x\n",
272                 AXP288_FG_OCV_CAP_REG,
273                 fuel_gauge_reg_readb(info, AXP288_FG_OCV_CAP_REG));
274         seq_printf(s, "  FG_CC_CAP[%02x] : %02x\n",
275                 AXP288_FG_CC_CAP_REG,
276                 fuel_gauge_reg_readb(info, AXP288_FG_CC_CAP_REG));
277         seq_printf(s, " FG_LOW_CAP[%02x] : %02x\n",
278                 AXP288_FG_LOW_CAP_REG,
279                 fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG));
280         seq_printf(s, "TUNING_CTL0[%02x] : %02x\n",
281                 AXP288_FG_TUNE0,
282                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE0));
283         seq_printf(s, "TUNING_CTL1[%02x] : %02x\n",
284                 AXP288_FG_TUNE1,
285                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE1));
286         seq_printf(s, "TUNING_CTL2[%02x] : %02x\n",
287                 AXP288_FG_TUNE2,
288                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE2));
289         seq_printf(s, "TUNING_CTL3[%02x] : %02x\n",
290                 AXP288_FG_TUNE3,
291                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE3));
292         seq_printf(s, "TUNING_CTL4[%02x] : %02x\n",
293                 AXP288_FG_TUNE4,
294                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE4));
295         seq_printf(s, "TUNING_CTL5[%02x] : %02x\n",
296                 AXP288_FG_TUNE5,
297                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE5));
298
299         ret = pmic_read_adc_val("axp288-batt-temp", &raw_val, info);
300         if (ret >= 0)
301                 seq_printf(s, "axp288-batttemp : %d\n", raw_val);
302         ret = pmic_read_adc_val("axp288-pmic-temp", &raw_val, info);
303         if (ret >= 0)
304                 seq_printf(s, "axp288-pmictemp : %d\n", raw_val);
305         ret = pmic_read_adc_val("axp288-system-temp", &raw_val, info);
306         if (ret >= 0)
307                 seq_printf(s, "axp288-systtemp : %d\n", raw_val);
308         ret = pmic_read_adc_val("axp288-chrg-curr", &raw_val, info);
309         if (ret >= 0)
310                 seq_printf(s, "axp288-chrgcurr : %d\n", raw_val);
311         ret = pmic_read_adc_val("axp288-chrg-d-curr", &raw_val, info);
312         if (ret >= 0)
313                 seq_printf(s, "axp288-dchrgcur : %d\n", raw_val);
314         ret = pmic_read_adc_val("axp288-batt-volt", &raw_val, info);
315         if (ret >= 0)
316                 seq_printf(s, "axp288-battvolt : %d\n", raw_val);
317
318         return 0;
319 }
320
321 static int debug_open(struct inode *inode, struct file *file)
322 {
323         return single_open(file, fuel_gauge_debug_show, inode->i_private);
324 }
325
326 static const struct file_operations fg_debug_fops = {
327         .open       = debug_open,
328         .read       = seq_read,
329         .llseek     = seq_lseek,
330         .release    = single_release,
331 };
332
333 static void fuel_gauge_create_debugfs(struct axp288_fg_info *info)
334 {
335         info->debug_file = debugfs_create_file("fuelgauge", 0666, NULL,
336                 info, &fg_debug_fops);
337 }
338
339 static void fuel_gauge_remove_debugfs(struct axp288_fg_info *info)
340 {
341         debugfs_remove(info->debug_file);
342 }
343 #else
344 static inline void fuel_gauge_create_debugfs(struct axp288_fg_info *info)
345 {
346 }
347 static inline void fuel_gauge_remove_debugfs(struct axp288_fg_info *info)
348 {
349 }
350 #endif
351
352 static void fuel_gauge_get_status(struct axp288_fg_info *info)
353 {
354         int pwr_stat, ret;
355         int charge, discharge;
356
357         pwr_stat = fuel_gauge_reg_readb(info, AXP20X_PWR_INPUT_STATUS);
358         if (pwr_stat < 0) {
359                 dev_err(&info->pdev->dev,
360                         "PWR STAT read failed:%d\n", pwr_stat);
361                 return;
362         }
363         ret = pmic_read_adc_val("axp288-chrg-curr", &charge, info);
364         if (ret < 0) {
365                 dev_err(&info->pdev->dev,
366                         "ADC charge current read failed:%d\n", ret);
367                 return;
368         }
369         ret = pmic_read_adc_val("axp288-chrg-d-curr", &discharge, info);
370         if (ret < 0) {
371                 dev_err(&info->pdev->dev,
372                         "ADC discharge current read failed:%d\n", ret);
373                 return;
374         }
375
376         if (charge > 0)
377                 info->status = POWER_SUPPLY_STATUS_CHARGING;
378         else if (discharge > 0)
379                 info->status = POWER_SUPPLY_STATUS_DISCHARGING;
380         else {
381                 if (pwr_stat & CHRG_STAT_BAT_PRESENT)
382                         info->status = POWER_SUPPLY_STATUS_FULL;
383                 else
384                         info->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
385         }
386 }
387
388 static int fuel_gauge_get_vbatt(struct axp288_fg_info *info, int *vbatt)
389 {
390         int ret = 0, raw_val;
391
392         ret = pmic_read_adc_val("axp288-batt-volt", &raw_val, info);
393         if (ret < 0)
394                 goto vbatt_read_fail;
395
396         *vbatt = VOLTAGE_FROM_ADC(raw_val);
397 vbatt_read_fail:
398         return ret;
399 }
400
401 static int fuel_gauge_get_current(struct axp288_fg_info *info, int *cur)
402 {
403         int ret, value = 0;
404         int charge, discharge;
405
406         ret = pmic_read_adc_val("axp288-chrg-curr", &charge, info);
407         if (ret < 0)
408                 goto current_read_fail;
409         ret = pmic_read_adc_val("axp288-chrg-d-curr", &discharge, info);
410         if (ret < 0)
411                 goto current_read_fail;
412
413         if (charge > 0)
414                 value = charge;
415         else if (discharge > 0)
416                 value = -1 * discharge;
417
418         *cur = value;
419 current_read_fail:
420         return ret;
421 }
422
423 static int fuel_gauge_get_vocv(struct axp288_fg_info *info, int *vocv)
424 {
425         int ret;
426
427         ret = fuel_gauge_read_12bit_word(info, AXP288_FG_OCVH_REG);
428         if (ret >= 0)
429                 *vocv = VOLTAGE_FROM_ADC(ret);
430
431         return ret;
432 }
433
434 static int fuel_gauge_battery_health(struct axp288_fg_info *info)
435 {
436         int ret, vocv, health = POWER_SUPPLY_HEALTH_UNKNOWN;
437
438         ret = fuel_gauge_get_vocv(info, &vocv);
439         if (ret < 0)
440                 goto health_read_fail;
441
442         if (vocv > info->max_volt)
443                 health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
444         else
445                 health = POWER_SUPPLY_HEALTH_GOOD;
446
447 health_read_fail:
448         return health;
449 }
450
451 static int fuel_gauge_get_property(struct power_supply *ps,
452                 enum power_supply_property prop,
453                 union power_supply_propval *val)
454 {
455         struct axp288_fg_info *info = power_supply_get_drvdata(ps);
456         int ret = 0, value;
457
458         mutex_lock(&info->lock);
459         switch (prop) {
460         case POWER_SUPPLY_PROP_STATUS:
461                 fuel_gauge_get_status(info);
462                 val->intval = info->status;
463                 break;
464         case POWER_SUPPLY_PROP_HEALTH:
465                 val->intval = fuel_gauge_battery_health(info);
466                 break;
467         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
468                 ret = fuel_gauge_get_vbatt(info, &value);
469                 if (ret < 0)
470                         goto fuel_gauge_read_err;
471                 val->intval = PROP_VOLT(value);
472                 break;
473         case POWER_SUPPLY_PROP_VOLTAGE_OCV:
474                 ret = fuel_gauge_get_vocv(info, &value);
475                 if (ret < 0)
476                         goto fuel_gauge_read_err;
477                 val->intval = PROP_VOLT(value);
478                 break;
479         case POWER_SUPPLY_PROP_CURRENT_NOW:
480                 ret = fuel_gauge_get_current(info, &value);
481                 if (ret < 0)
482                         goto fuel_gauge_read_err;
483                 val->intval = PROP_CURR(value);
484                 break;
485         case POWER_SUPPLY_PROP_PRESENT:
486                 ret = fuel_gauge_reg_readb(info, AXP20X_PWR_OP_MODE);
487                 if (ret < 0)
488                         goto fuel_gauge_read_err;
489
490                 if (ret & CHRG_STAT_BAT_PRESENT)
491                         val->intval = 1;
492                 else
493                         val->intval = 0;
494                 break;
495         case POWER_SUPPLY_PROP_CAPACITY:
496                 ret = fuel_gauge_reg_readb(info, AXP20X_FG_RES);
497                 if (ret < 0)
498                         goto fuel_gauge_read_err;
499
500                 if (!(ret & FG_REP_CAP_VALID))
501                         dev_err(&info->pdev->dev,
502                                 "capacity measurement not valid\n");
503                 val->intval = (ret & FG_REP_CAP_VAL_MASK);
504                 break;
505         case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
506                 ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG);
507                 if (ret < 0)
508                         goto fuel_gauge_read_err;
509                 val->intval = (ret & 0x0f);
510                 break;
511         case POWER_SUPPLY_PROP_TECHNOLOGY:
512                 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
513                 break;
514         case POWER_SUPPLY_PROP_CHARGE_NOW:
515                 ret = fuel_gauge_read_15bit_word(info, AXP288_FG_CC_MTR1_REG);
516                 if (ret < 0)
517                         goto fuel_gauge_read_err;
518
519                 val->intval = ret * FG_DES_CAP_RES_LSB;
520                 break;
521         case POWER_SUPPLY_PROP_CHARGE_FULL:
522                 ret = fuel_gauge_read_15bit_word(info, AXP288_FG_DES_CAP1_REG);
523                 if (ret < 0)
524                         goto fuel_gauge_read_err;
525
526                 val->intval = ret * FG_DES_CAP_RES_LSB;
527                 break;
528         case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
529                 val->intval = PROP_VOLT(info->max_volt);
530                 break;
531         default:
532                 mutex_unlock(&info->lock);
533                 return -EINVAL;
534         }
535
536         mutex_unlock(&info->lock);
537         return 0;
538
539 fuel_gauge_read_err:
540         mutex_unlock(&info->lock);
541         return ret;
542 }
543
544 static int fuel_gauge_set_property(struct power_supply *ps,
545                 enum power_supply_property prop,
546                 const union power_supply_propval *val)
547 {
548         struct axp288_fg_info *info = power_supply_get_drvdata(ps);
549         int ret = 0;
550
551         mutex_lock(&info->lock);
552         switch (prop) {
553         case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
554                 if ((val->intval < 0) || (val->intval > 15)) {
555                         ret = -EINVAL;
556                         break;
557                 }
558                 ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG);
559                 if (ret < 0)
560                         break;
561                 ret &= 0xf0;
562                 ret |= (val->intval & 0xf);
563                 ret = fuel_gauge_reg_writeb(info, AXP288_FG_LOW_CAP_REG, ret);
564                 break;
565         default:
566                 ret = -EINVAL;
567                 break;
568         }
569
570         mutex_unlock(&info->lock);
571         return ret;
572 }
573
574 static int fuel_gauge_property_is_writeable(struct power_supply *psy,
575         enum power_supply_property psp)
576 {
577         int ret;
578
579         switch (psp) {
580         case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
581                 ret = 1;
582                 break;
583         default:
584                 ret = 0;
585         }
586
587         return ret;
588 }
589
590 static void fuel_gauge_status_monitor(struct work_struct *work)
591 {
592         struct axp288_fg_info *info = container_of(work,
593                 struct axp288_fg_info, status_monitor.work);
594
595         fuel_gauge_get_status(info);
596         power_supply_changed(info->bat);
597         schedule_delayed_work(&info->status_monitor, STATUS_MON_DELAY_JIFFIES);
598 }
599
600 static irqreturn_t fuel_gauge_thread_handler(int irq, void *dev)
601 {
602         struct axp288_fg_info *info = dev;
603         int i;
604
605         for (i = 0; i < AXP288_FG_INTR_NUM; i++) {
606                 if (info->irq[i] == irq)
607                         break;
608         }
609
610         if (i >= AXP288_FG_INTR_NUM) {
611                 dev_warn(&info->pdev->dev, "spurious interrupt!!\n");
612                 return IRQ_NONE;
613         }
614
615         switch (i) {
616         case QWBTU_IRQ:
617                 dev_info(&info->pdev->dev,
618                         "Quit Battery under temperature in work mode IRQ (QWBTU)\n");
619                 break;
620         case WBTU_IRQ:
621                 dev_info(&info->pdev->dev,
622                         "Battery under temperature in work mode IRQ (WBTU)\n");
623                 break;
624         case QWBTO_IRQ:
625                 dev_info(&info->pdev->dev,
626                         "Quit Battery over temperature in work mode IRQ (QWBTO)\n");
627                 break;
628         case WBTO_IRQ:
629                 dev_info(&info->pdev->dev,
630                         "Battery over temperature in work mode IRQ (WBTO)\n");
631                 break;
632         case WL2_IRQ:
633                 dev_info(&info->pdev->dev, "Low Batt Warning(2) INTR\n");
634                 break;
635         case WL1_IRQ:
636                 dev_info(&info->pdev->dev, "Low Batt Warning(1) INTR\n");
637                 break;
638         default:
639                 dev_warn(&info->pdev->dev, "Spurious Interrupt!!!\n");
640         }
641
642         power_supply_changed(info->bat);
643         return IRQ_HANDLED;
644 }
645
646 static void fuel_gauge_external_power_changed(struct power_supply *psy)
647 {
648         struct axp288_fg_info *info = power_supply_get_drvdata(psy);
649
650         power_supply_changed(info->bat);
651 }
652
653 static const struct power_supply_desc fuel_gauge_desc = {
654         .name                   = DEV_NAME,
655         .type                   = POWER_SUPPLY_TYPE_BATTERY,
656         .properties             = fuel_gauge_props,
657         .num_properties         = ARRAY_SIZE(fuel_gauge_props),
658         .get_property           = fuel_gauge_get_property,
659         .set_property           = fuel_gauge_set_property,
660         .property_is_writeable  = fuel_gauge_property_is_writeable,
661         .external_power_changed = fuel_gauge_external_power_changed,
662 };
663
664 static void fuel_gauge_init_irq(struct axp288_fg_info *info)
665 {
666         int ret, i, pirq;
667
668         for (i = 0; i < AXP288_FG_INTR_NUM; i++) {
669                 pirq = platform_get_irq(info->pdev, i);
670                 info->irq[i] = regmap_irq_get_virq(info->regmap_irqc, pirq);
671                 if (info->irq[i] < 0) {
672                         dev_warn(&info->pdev->dev,
673                                 "regmap_irq get virq failed for IRQ %d: %d\n",
674                                 pirq, info->irq[i]);
675                         info->irq[i] = -1;
676                         goto intr_failed;
677                 }
678                 ret = request_threaded_irq(info->irq[i],
679                                 NULL, fuel_gauge_thread_handler,
680                                 IRQF_ONESHOT, DEV_NAME, info);
681                 if (ret) {
682                         dev_warn(&info->pdev->dev,
683                                 "request irq failed for IRQ %d: %d\n",
684                                 pirq, info->irq[i]);
685                         info->irq[i] = -1;
686                         goto intr_failed;
687                 } else {
688                         dev_info(&info->pdev->dev, "HW IRQ %d -> VIRQ %d\n",
689                                 pirq, info->irq[i]);
690                 }
691         }
692         return;
693
694 intr_failed:
695         for (; i > 0; i--) {
696                 free_irq(info->irq[i - 1], info);
697                 info->irq[i - 1] = -1;
698         }
699 }
700
701 static int axp288_fuel_gauge_probe(struct platform_device *pdev)
702 {
703         int ret = 0;
704         struct axp288_fg_info *info;
705         struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
706         struct power_supply_config psy_cfg = {};
707
708         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
709         if (!info)
710                 return -ENOMEM;
711
712         info->pdev = pdev;
713         info->regmap = axp20x->regmap;
714         info->regmap_irqc = axp20x->regmap_irqc;
715         info->status = POWER_SUPPLY_STATUS_UNKNOWN;
716
717         platform_set_drvdata(pdev, info);
718
719         mutex_init(&info->lock);
720         INIT_DELAYED_WORK(&info->status_monitor, fuel_gauge_status_monitor);
721
722         ret = fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP1_REG);
723         if (ret < 0)
724                 return ret;
725
726         if (!(ret & FG_DES_CAP1_VALID)) {
727                 dev_err(&pdev->dev, "axp288 not configured by firmware\n");
728                 return -ENODEV;
729         }
730
731         ret = fuel_gauge_reg_readb(info, AXP20X_CHRG_CTRL1);
732         if (ret < 0)
733                 return ret;
734         switch ((ret & CHRG_CCCV_CV_MASK) >> CHRG_CCCV_CV_BIT_POS) {
735         case CHRG_CCCV_CV_4100MV:
736                 info->max_volt = 4100;
737                 break;
738         case CHRG_CCCV_CV_4150MV:
739                 info->max_volt = 4150;
740                 break;
741         case CHRG_CCCV_CV_4200MV:
742                 info->max_volt = 4200;
743                 break;
744         case CHRG_CCCV_CV_4350MV:
745                 info->max_volt = 4350;
746                 break;
747         }
748
749         psy_cfg.drv_data = info;
750         info->bat = power_supply_register(&pdev->dev, &fuel_gauge_desc, &psy_cfg);
751         if (IS_ERR(info->bat)) {
752                 ret = PTR_ERR(info->bat);
753                 dev_err(&pdev->dev, "failed to register battery: %d\n", ret);
754                 return ret;
755         }
756
757         fuel_gauge_create_debugfs(info);
758         fuel_gauge_init_irq(info);
759         schedule_delayed_work(&info->status_monitor, STATUS_MON_DELAY_JIFFIES);
760
761         return 0;
762 }
763
764 static const struct platform_device_id axp288_fg_id_table[] = {
765         { .name = DEV_NAME },
766         {},
767 };
768 MODULE_DEVICE_TABLE(platform, axp288_fg_id_table);
769
770 static int axp288_fuel_gauge_remove(struct platform_device *pdev)
771 {
772         struct axp288_fg_info *info = platform_get_drvdata(pdev);
773         int i;
774
775         cancel_delayed_work_sync(&info->status_monitor);
776         power_supply_unregister(info->bat);
777         fuel_gauge_remove_debugfs(info);
778
779         for (i = 0; i < AXP288_FG_INTR_NUM; i++)
780                 if (info->irq[i] >= 0)
781                         free_irq(info->irq[i], info);
782
783         return 0;
784 }
785
786 static struct platform_driver axp288_fuel_gauge_driver = {
787         .probe = axp288_fuel_gauge_probe,
788         .remove = axp288_fuel_gauge_remove,
789         .id_table = axp288_fg_id_table,
790         .driver = {
791                 .name = DEV_NAME,
792         },
793 };
794
795 module_platform_driver(axp288_fuel_gauge_driver);
796
797 MODULE_AUTHOR("Ramakrishna Pallala <ramakrishna.pallala@intel.com>");
798 MODULE_AUTHOR("Todd Brandt <todd.e.brandt@linux.intel.com>");
799 MODULE_DESCRIPTION("Xpower AXP288 Fuel Gauge Driver");
800 MODULE_LICENSE("GPL");