?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
dm thin metadata: fix __udivdi3 undefined on 32-bit
[linux/fpc-iii.git] / drivers / power / axp288_fuel_gauge.c
blob50c0110d6b58008df681c5bfcac66e89dcac5e46
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
115 enum {
116 QWBTU_IRQ = 0,
117 WBTU_IRQ,
118 QWBTO_IRQ,
119 WBTO_IRQ,
120 WL2_IRQ,
121 WL1_IRQ,
122 };
123
124 struct 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
137 static 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
160 static 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
179 static 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
191 static 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
212 err_exit:
213 iio_channel_release(indio_chan);
214 exit:
215 return ret;
216 }
217
218 #ifdef CONFIG_DEBUG_FS
219 static 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
319 static int debug_open(struct inode *inode, struct file *file)
320 {
321 return single_open(file, fuel_gauge_debug_show, inode->i_private);
322 }
323
324 static 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
331 static 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
337 static void fuel_gauge_remove_debugfs(struct axp288_fg_info *info)
338 {
339 debugfs_remove(info->debug_file);
340 }
341 #else
342 static inline void fuel_gauge_create_debugfs(struct axp288_fg_info *info)
343 {
344 }
345 static inline void fuel_gauge_remove_debugfs(struct axp288_fg_info *info)
346 {
347 }
348 #endif
349
350 static 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
386 static 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);
395 vbatt_read_fail:
396 return ret;
397 }
398
399 static 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;
417 current_read_fail:
418 return ret;
419 }
420
421 static 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
463 static 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
503 static 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
513 temp_read_fail:
514 return ret;
515 }
516
517 static 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);
533 vocv_read_fail:
534 return ret;
535 }
536
537 static 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
561 health_read_fail:
562 return health;
563 }
564
565 static 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
576 static 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
587 static 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
708 fuel_gauge_read_err:
709 mutex_unlock(&info->lock);
710 return ret;
711 }
712
713 static 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
772 static 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
793 static 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
803 static 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
849 static 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
856 static 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
867 static 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
894 static 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);
924 fg_prog_ocv_fail:
925 return ret;
926 }
927
928 static 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
940 fg_prog_descap_fail:
941 return ret;
942 }
943
944 static 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
955 fg_prog_ocv_fail:
956 return ret;
957 }
958
959 static 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
971 fg_prog_ocv_fail:
972 return ret;
973 }
974
975 static 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
1019 static 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
1049 intr_failed:
1050 for (; i > 0; i--) {
1051 free_irq(info->irq[i - 1], info);
1052 info->irq[i - 1] = -1;
1053 }
1054 }
1055
1056 static 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
1079 static 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
1120 static const struct platform_device_id axp288_fg_id_table[] = {
1121 { .name = DEV_NAME },
1122 {},
1123 };
1124
1125 static 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
1141 static 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
1150 module_platform_driver(axp288_fuel_gauge_driver);
1151
1152 MODULE_AUTHOR("Ramakrishna Pallala <ramakrishna.pallala@intel.com>");
1153 MODULE_AUTHOR("Todd Brandt <todd.e.brandt@linux.intel.com>");
1154 MODULE_DESCRIPTION("Xpower AXP288 Fuel Gauge Driver");
1155 MODULE_LICENSE("GPL");
Linux with added FPC-III support