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Merge tag 'nfs-for-4.9-1' of git://git.linux-nfs.org/projects/anna/linux-nfs
[mirror_ubuntu-zesty-kernel.git] / drivers / power / supply / axp288_fuel_gauge.c
CommitLineData
5a5bf490
TB		 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>
5a5bf490
TB		 25#include <linux/workqueue.h>
26#include <linux/mfd/axp20x.h>
27#include <linux/platform_device.h>
28#include <linux/power_supply.h>
29#include <linux/iio/consumer.h>
30#include <linux/debugfs.h>
31#include <linux/seq_file.h>
32
33#define CHRG_STAT_BAT_SAFE_MODE (1 << 3)
34#define CHRG_STAT_BAT_VALID (1 << 4)
35#define CHRG_STAT_BAT_PRESENT (1 << 5)
36#define CHRG_STAT_CHARGING (1 << 6)
37#define CHRG_STAT_PMIC_OTP (1 << 7)
38
39#define CHRG_CCCV_CC_MASK 0xf /* 4 bits */
40#define CHRG_CCCV_CC_BIT_POS 0
41#define CHRG_CCCV_CC_OFFSET 200 /* 200mA */
42#define CHRG_CCCV_CC_LSB_RES 200 /* 200mA */
43#define CHRG_CCCV_ITERM_20P (1 << 4) /* 20% of CC */
44#define CHRG_CCCV_CV_MASK 0x60 /* 2 bits */
45#define CHRG_CCCV_CV_BIT_POS 5
46#define CHRG_CCCV_CV_4100MV 0x0 /* 4.10V */
47#define CHRG_CCCV_CV_4150MV 0x1 /* 4.15V */
48#define CHRG_CCCV_CV_4200MV 0x2 /* 4.20V */
49#define CHRG_CCCV_CV_4350MV 0x3 /* 4.35V */
50#define CHRG_CCCV_CHG_EN (1 << 7)
51
52#define CV_4100 4100 /* 4100mV */
53#define CV_4150 4150 /* 4150mV */
54#define CV_4200 4200 /* 4200mV */
55#define CV_4350 4350 /* 4350mV */
56
57#define TEMP_IRQ_CFG_QWBTU (1 << 0)
58#define TEMP_IRQ_CFG_WBTU (1 << 1)
59#define TEMP_IRQ_CFG_QWBTO (1 << 2)
60#define TEMP_IRQ_CFG_WBTO (1 << 3)
61#define TEMP_IRQ_CFG_MASK 0xf
62
63#define FG_IRQ_CFG_LOWBATT_WL2 (1 << 0)
64#define FG_IRQ_CFG_LOWBATT_WL1 (1 << 1)
65#define FG_IRQ_CFG_LOWBATT_MASK 0x3
66#define LOWBAT_IRQ_STAT_LOWBATT_WL2 (1 << 0)
67#define LOWBAT_IRQ_STAT_LOWBATT_WL1 (1 << 1)
68
69#define FG_CNTL_OCV_ADJ_STAT (1 << 2)
70#define FG_CNTL_OCV_ADJ_EN (1 << 3)
71#define FG_CNTL_CAP_ADJ_STAT (1 << 4)
72#define FG_CNTL_CAP_ADJ_EN (1 << 5)
73#define FG_CNTL_CC_EN (1 << 6)
74#define FG_CNTL_GAUGE_EN (1 << 7)
75
76#define FG_REP_CAP_VALID (1 << 7)
77#define FG_REP_CAP_VAL_MASK 0x7F
78
79#define FG_DES_CAP1_VALID (1 << 7)
80#define FG_DES_CAP1_VAL_MASK 0x7F
81#define FG_DES_CAP0_VAL_MASK 0xFF
82#define FG_DES_CAP_RES_LSB 1456 /* 1.456mAhr */
83
84#define FG_CC_MTR1_VALID (1 << 7)
85#define FG_CC_MTR1_VAL_MASK 0x7F
86#define FG_CC_MTR0_VAL_MASK 0xFF
87#define FG_DES_CC_RES_LSB 1456 /* 1.456mAhr */
88
89#define FG_OCV_CAP_VALID (1 << 7)
90#define FG_OCV_CAP_VAL_MASK 0x7F
91#define FG_CC_CAP_VALID (1 << 7)
92#define FG_CC_CAP_VAL_MASK 0x7F
93
94#define FG_LOW_CAP_THR1_MASK 0xf0 /* 5% tp 20% */
95#define FG_LOW_CAP_THR1_VAL 0xa0 /* 15 perc */
96#define FG_LOW_CAP_THR2_MASK 0x0f /* 0% to 15% */
97#define FG_LOW_CAP_WARN_THR 14 /* 14 perc */
98#define FG_LOW_CAP_CRIT_THR 4 /* 4 perc */
99#define FG_LOW_CAP_SHDN_THR 0 /* 0 perc */
100
101#define STATUS_MON_DELAY_JIFFIES (HZ * 60) /*60 sec */
102#define NR_RETRY_CNT 3
103#define DEV_NAME "axp288_fuel_gauge"
104
105/* 1.1mV per LSB expressed in uV */
106#define VOLTAGE_FROM_ADC(a) ((a * 11) / 10)
107/* properties converted to tenths of degrees, uV, uA, uW */
108#define PROP_TEMP(a) ((a) * 10)
109#define UNPROP_TEMP(a) ((a) / 10)
110#define PROP_VOLT(a) ((a) * 1000)
111#define PROP_CURR(a) ((a) * 1000)
112
113#define AXP288_FG_INTR_NUM 6
114enum {
115 QWBTU_IRQ = 0,
116 WBTU_IRQ,
117 QWBTO_IRQ,
118 WBTO_IRQ,
119 WL2_IRQ,
120 WL1_IRQ,
121};
122
123struct axp288_fg_info {
124 struct platform_device *pdev;
125 struct axp20x_fg_pdata *pdata;
126 struct regmap *regmap;
127 struct regmap_irq_chip_data *regmap_irqc;
128 int irq[AXP288_FG_INTR_NUM];
297d716f 129 struct power_supply *bat;
5a5bf490
TB		 130 struct mutex lock;
131 int status;
132 struct delayed_work status_monitor;
133 struct dentry *debug_file;
134};
135
136static enum power_supply_property fuel_gauge_props[] = {
137 POWER_SUPPLY_PROP_STATUS,
138 POWER_SUPPLY_PROP_PRESENT,
139 POWER_SUPPLY_PROP_HEALTH,
140 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
141 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
142 POWER_SUPPLY_PROP_VOLTAGE_NOW,
143 POWER_SUPPLY_PROP_VOLTAGE_OCV,
144 POWER_SUPPLY_PROP_CURRENT_NOW,
145 POWER_SUPPLY_PROP_CAPACITY,
146 POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN,
147 POWER_SUPPLY_PROP_TEMP,
148 POWER_SUPPLY_PROP_TEMP_MAX,
149 POWER_SUPPLY_PROP_TEMP_MIN,
150 POWER_SUPPLY_PROP_TEMP_ALERT_MIN,
151 POWER_SUPPLY_PROP_TEMP_ALERT_MAX,
152 POWER_SUPPLY_PROP_TECHNOLOGY,
153 POWER_SUPPLY_PROP_CHARGE_FULL,
154 POWER_SUPPLY_PROP_CHARGE_NOW,
155 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
156 POWER_SUPPLY_PROP_MODEL_NAME,
157};
158
159static int fuel_gauge_reg_readb(struct axp288_fg_info *info, int reg)
160{
161 int ret, i;
162 unsigned int val;
163
164 for (i = 0; i < NR_RETRY_CNT; i++) {
165 ret = regmap_read(info->regmap, reg, &val);
166 if (ret == -EBUSY)
167 continue;
168 else
169 break;
170 }
171
172 if (ret < 0)
173 dev_err(&info->pdev->dev, "axp288 reg read err:%d\n", ret);
174
175 return val;
176}
177
178static int fuel_gauge_reg_writeb(struct axp288_fg_info *info, int reg, u8 val)
179{
180 int ret;
181
182 ret = regmap_write(info->regmap, reg, (unsigned int)val);
183
184 if (ret < 0)
185 dev_err(&info->pdev->dev, "axp288 reg write err:%d\n", ret);
186
187 return ret;
188}
189
190static int pmic_read_adc_val(const char *name, int *raw_val,
191 struct axp288_fg_info *info)
192{
193 int ret, val = 0;
194 struct iio_channel *indio_chan;
195
196 indio_chan = iio_channel_get(NULL, name);
197 if (IS_ERR_OR_NULL(indio_chan)) {
198 ret = PTR_ERR(indio_chan);
199 goto exit;
200 }
201 ret = iio_read_channel_raw(indio_chan, &val);
202 if (ret < 0) {
203 dev_err(&info->pdev->dev,
204 "IIO channel read error: %x, %x\n", ret, val);
205 goto err_exit;
206 }
207
208 dev_dbg(&info->pdev->dev, "adc raw val=%x\n", val);
209 *raw_val = val;
210
211err_exit:
212 iio_channel_release(indio_chan);
213exit:
214 return ret;
215}
216
217#ifdef CONFIG_DEBUG_FS
218static int fuel_gauge_debug_show(struct seq_file *s, void *data)
219{
220 struct axp288_fg_info *info = s->private;
221 int raw_val, ret;
222
223 seq_printf(s, " PWR_STATUS[%02x] : %02x\n",
224 AXP20X_PWR_INPUT_STATUS,
225 fuel_gauge_reg_readb(info, AXP20X_PWR_INPUT_STATUS));
226 seq_printf(s, "PWR_OP_MODE[%02x] : %02x\n",
227 AXP20X_PWR_OP_MODE,
228 fuel_gauge_reg_readb(info, AXP20X_PWR_OP_MODE));
229 seq_printf(s, " CHRG_CTRL1[%02x] : %02x\n",
230 AXP20X_CHRG_CTRL1,
231 fuel_gauge_reg_readb(info, AXP20X_CHRG_CTRL1));
232 seq_printf(s, " VLTF[%02x] : %02x\n",
233 AXP20X_V_LTF_DISCHRG,
234 fuel_gauge_reg_readb(info, AXP20X_V_LTF_DISCHRG));
235 seq_printf(s, " VHTF[%02x] : %02x\n",
236 AXP20X_V_HTF_DISCHRG,
237 fuel_gauge_reg_readb(info, AXP20X_V_HTF_DISCHRG));
238 seq_printf(s, " CC_CTRL[%02x] : %02x\n",
239 AXP20X_CC_CTRL,
240 fuel_gauge_reg_readb(info, AXP20X_CC_CTRL));
241 seq_printf(s, "BATTERY CAP[%02x] : %02x\n",
242 AXP20X_FG_RES,
243 fuel_gauge_reg_readb(info, AXP20X_FG_RES));
244 seq_printf(s, " FG_RDC1[%02x] : %02x\n",
245 AXP288_FG_RDC1_REG,
246 fuel_gauge_reg_readb(info, AXP288_FG_RDC1_REG));
247 seq_printf(s, " FG_RDC0[%02x] : %02x\n",
248 AXP288_FG_RDC0_REG,
249 fuel_gauge_reg_readb(info, AXP288_FG_RDC0_REG));
250 seq_printf(s, " FG_OCVH[%02x] : %02x\n",
251 AXP288_FG_OCVH_REG,
252 fuel_gauge_reg_readb(info, AXP288_FG_OCVH_REG));
253 seq_printf(s, " FG_OCVL[%02x] : %02x\n",
254 AXP288_FG_OCVL_REG,
255 fuel_gauge_reg_readb(info, AXP288_FG_OCVL_REG));
256 seq_printf(s, "FG_DES_CAP1[%02x] : %02x\n",
257 AXP288_FG_DES_CAP1_REG,
258 fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP1_REG));
259 seq_printf(s, "FG_DES_CAP0[%02x] : %02x\n",
260 AXP288_FG_DES_CAP0_REG,
261 fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP0_REG));
262 seq_printf(s, " FG_CC_MTR1[%02x] : %02x\n",
263 AXP288_FG_CC_MTR1_REG,
264 fuel_gauge_reg_readb(info, AXP288_FG_CC_MTR1_REG));
265 seq_printf(s, " FG_CC_MTR0[%02x] : %02x\n",
266 AXP288_FG_CC_MTR0_REG,
267 fuel_gauge_reg_readb(info, AXP288_FG_CC_MTR0_REG));
268 seq_printf(s, " FG_OCV_CAP[%02x] : %02x\n",
269 AXP288_FG_OCV_CAP_REG,
270 fuel_gauge_reg_readb(info, AXP288_FG_OCV_CAP_REG));
271 seq_printf(s, " FG_CC_CAP[%02x] : %02x\n",
272 AXP288_FG_CC_CAP_REG,
273 fuel_gauge_reg_readb(info, AXP288_FG_CC_CAP_REG));
274 seq_printf(s, " FG_LOW_CAP[%02x] : %02x\n",
275 AXP288_FG_LOW_CAP_REG,
276 fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG));
277 seq_printf(s, "TUNING_CTL0[%02x] : %02x\n",
278 AXP288_FG_TUNE0,
279 fuel_gauge_reg_readb(info, AXP288_FG_TUNE0));
280 seq_printf(s, "TUNING_CTL1[%02x] : %02x\n",
281 AXP288_FG_TUNE1,
282 fuel_gauge_reg_readb(info, AXP288_FG_TUNE1));
283 seq_printf(s, "TUNING_CTL2[%02x] : %02x\n",
284 AXP288_FG_TUNE2,
285 fuel_gauge_reg_readb(info, AXP288_FG_TUNE2));
286 seq_printf(s, "TUNING_CTL3[%02x] : %02x\n",
287 AXP288_FG_TUNE3,
288 fuel_gauge_reg_readb(info, AXP288_FG_TUNE3));
289 seq_printf(s, "TUNING_CTL4[%02x] : %02x\n",
290 AXP288_FG_TUNE4,
291 fuel_gauge_reg_readb(info, AXP288_FG_TUNE4));
292 seq_printf(s, "TUNING_CTL5[%02x] : %02x\n",
293 AXP288_FG_TUNE5,
294 fuel_gauge_reg_readb(info, AXP288_FG_TUNE5));
295
296 ret = pmic_read_adc_val("axp288-batt-temp", &raw_val, info);
297 if (ret >= 0)
298 seq_printf(s, "axp288-batttemp : %d\n", raw_val);
299 ret = pmic_read_adc_val("axp288-pmic-temp", &raw_val, info);
300 if (ret >= 0)
301 seq_printf(s, "axp288-pmictemp : %d\n", raw_val);
302 ret = pmic_read_adc_val("axp288-system-temp", &raw_val, info);
303 if (ret >= 0)
304 seq_printf(s, "axp288-systtemp : %d\n", raw_val);
305 ret = pmic_read_adc_val("axp288-chrg-curr", &raw_val, info);
306 if (ret >= 0)
307 seq_printf(s, "axp288-chrgcurr : %d\n", raw_val);
308 ret = pmic_read_adc_val("axp288-chrg-d-curr", &raw_val, info);
309 if (ret >= 0)
310 seq_printf(s, "axp288-dchrgcur : %d\n", raw_val);
311 ret = pmic_read_adc_val("axp288-batt-volt", &raw_val, info);
312 if (ret >= 0)
313 seq_printf(s, "axp288-battvolt : %d\n", raw_val);
314
315 return 0;
316}
317
318static int debug_open(struct inode *inode, struct file *file)
319{
320 return single_open(file, fuel_gauge_debug_show, inode->i_private);
321}
322
323static const struct file_operations fg_debug_fops = {
324 .open = debug_open,
325 .read = seq_read,
326 .llseek = seq_lseek,
327 .release = single_release,
328};
329
330static void fuel_gauge_create_debugfs(struct axp288_fg_info *info)
331{
332 info->debug_file = debugfs_create_file("fuelgauge", 0666, NULL,
333 info, &fg_debug_fops);
334}
335
336static void fuel_gauge_remove_debugfs(struct axp288_fg_info *info)
337{
338 debugfs_remove(info->debug_file);
339}
340#else
341static inline void fuel_gauge_create_debugfs(struct axp288_fg_info *info)
342{
343}
344static inline void fuel_gauge_remove_debugfs(struct axp288_fg_info *info)
345{
346}
347#endif
348
349static void fuel_gauge_get_status(struct axp288_fg_info *info)
350{
351 int pwr_stat, ret;
352 int charge, discharge;
353
354 pwr_stat = fuel_gauge_reg_readb(info, AXP20X_PWR_INPUT_STATUS);
355 if (pwr_stat < 0) {
356 dev_err(&info->pdev->dev,
357 "PWR STAT read failed:%d\n", pwr_stat);
358 return;
359 }
360 ret = pmic_read_adc_val("axp288-chrg-curr", &charge, info);
361 if (ret < 0) {
362 dev_err(&info->pdev->dev,
363 "ADC charge current read failed:%d\n", ret);
364 return;
365 }
366 ret = pmic_read_adc_val("axp288-chrg-d-curr", &discharge, info);
367 if (ret < 0) {
368 dev_err(&info->pdev->dev,
369 "ADC discharge current read failed:%d\n", ret);
370 return;
371 }
372
373 if (charge > 0)
374 info->status = POWER_SUPPLY_STATUS_CHARGING;
375 else if (discharge > 0)
376 info->status = POWER_SUPPLY_STATUS_DISCHARGING;
377 else {
378 if (pwr_stat & CHRG_STAT_BAT_PRESENT)
379 info->status = POWER_SUPPLY_STATUS_FULL;
380 else
381 info->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
382 }
383}
384
385static int fuel_gauge_get_vbatt(struct axp288_fg_info *info, int *vbatt)
386{
387 int ret = 0, raw_val;
388
389 ret = pmic_read_adc_val("axp288-batt-volt", &raw_val, info);
390 if (ret < 0)
391 goto vbatt_read_fail;
392
393 *vbatt = VOLTAGE_FROM_ADC(raw_val);
394vbatt_read_fail:
395 return ret;
396}
397
398static int fuel_gauge_get_current(struct axp288_fg_info *info, int *cur)
399{
400 int ret, value = 0;
401 int charge, discharge;
402
403 ret = pmic_read_adc_val("axp288-chrg-curr", &charge, info);
404 if (ret < 0)
405 goto current_read_fail;
406 ret = pmic_read_adc_val("axp288-chrg-d-curr", &discharge, info);
407 if (ret < 0)
408 goto current_read_fail;
409
410 if (charge > 0)
411 value = charge;
412 else if (discharge > 0)
413 value = -1 * discharge;
414
415 *cur = value;
416current_read_fail:
417 return ret;
418}
419
420static int temp_to_adc(struct axp288_fg_info *info, int tval)
421{
422 int rntc = 0, i, ret, adc_val;
423 int rmin, rmax, tmin, tmax;
424 int tcsz = info->pdata->tcsz;
425
426 /* get the Rntc resitance value for this temp */
427 if (tval > info->pdata->thermistor_curve[0][1]) {
428 rntc = info->pdata->thermistor_curve[0][0];
429 } else if (tval <= info->pdata->thermistor_curve[tcsz-1][1]) {
430 rntc = info->pdata->thermistor_curve[tcsz-1][0];
431 } else {
432 for (i = 1; i < tcsz; i++) {
433 if (tval > info->pdata->thermistor_curve[i][1]) {
434 rmin = info->pdata->thermistor_curve[i-1][0];
435 rmax = info->pdata->thermistor_curve[i][0];
436 tmin = info->pdata->thermistor_curve[i-1][1];
437 tmax = info->pdata->thermistor_curve[i][1];
438 rntc = rmin + ((rmax - rmin) *
439 (tval - tmin) / (tmax - tmin));
440 break;
441 }
442 }
443 }
444
445 /* we need the current to calculate the proper adc voltage */
446 ret = fuel_gauge_reg_readb(info, AXP20X_ADC_RATE);
447 if (ret < 0) {
448 dev_err(&info->pdev->dev, "%s:read err:%d\n", __func__, ret);
449 ret = 0x30;
450 }
451
452 /*
453 * temperature is proportional to NTS thermistor resistance
454 * ADC_RATE[5-4] determines current, 00=20uA,01=40uA,10=60uA,11=80uA
455 * [12-bit ADC VAL] = R_NTC(Ω) * current / 800
456 */
457 adc_val = rntc * (20 + (20 * ((ret >> 4) & 0x3))) / 800;
458
459 return adc_val;
460}
461
462static int adc_to_temp(struct axp288_fg_info *info, int adc_val)
463{
464 int ret, r, i, tval = 0;
465 int rmin, rmax, tmin, tmax;
466 int tcsz = info->pdata->tcsz;
467
468 ret = fuel_gauge_reg_readb(info, AXP20X_ADC_RATE);
469 if (ret < 0) {
470 dev_err(&info->pdev->dev, "%s:read err:%d\n", __func__, ret);
471 ret = 0x30;
472 }
473
474 /*
475 * temperature is proportional to NTS thermistor resistance
476 * ADC_RATE[5-4] determines current, 00=20uA,01=40uA,10=60uA,11=80uA
477 * R_NTC(Ω) = [12-bit ADC VAL] * 800 / current
478 */
479 r = adc_val * 800 / (20 + (20 * ((ret >> 4) & 0x3)));
480
481 if (r < info->pdata->thermistor_curve[0][0]) {
482 tval = info->pdata->thermistor_curve[0][1];
483 } else if (r >= info->pdata->thermistor_curve[tcsz-1][0]) {
484 tval = info->pdata->thermistor_curve[tcsz-1][1];
485 } else {
486 for (i = 1; i < tcsz; i++) {
487 if (r < info->pdata->thermistor_curve[i][0]) {
488 rmin = info->pdata->thermistor_curve[i-1][0];
489 rmax = info->pdata->thermistor_curve[i][0];
490 tmin = info->pdata->thermistor_curve[i-1][1];
491 tmax = info->pdata->thermistor_curve[i][1];
492 tval = tmin + ((tmax - tmin) *
493 (r - rmin) / (rmax - rmin));
494 break;
495 }
496 }
497 }
498
499 return tval;
500}
501
502static int fuel_gauge_get_btemp(struct axp288_fg_info *info, int *btemp)
503{
504 int ret, raw_val = 0;
505
506 ret = pmic_read_adc_val("axp288-batt-temp", &raw_val, info);
507 if (ret < 0)
508 goto temp_read_fail;
509
510 *btemp = adc_to_temp(info, raw_val);
511
512temp_read_fail:
513 return ret;
514}
515
516static int fuel_gauge_get_vocv(struct axp288_fg_info *info, int *vocv)
517{
518 int ret, value;
519
520 /* 12-bit data value, upper 8 in OCVH, lower 4 in OCVL */
521 ret = fuel_gauge_reg_readb(info, AXP288_FG_OCVH_REG);
522 if (ret < 0)
523 goto vocv_read_fail;
524 value = ret << 4;
525
526 ret = fuel_gauge_reg_readb(info, AXP288_FG_OCVL_REG);
527 if (ret < 0)
528 goto vocv_read_fail;
529 value |= (ret & 0xf);
530
531 *vocv = VOLTAGE_FROM_ADC(value);
532vocv_read_fail:
533 return ret;
534}
535
536static int fuel_gauge_battery_health(struct axp288_fg_info *info)
537{
538 int temp, vocv;
539 int ret, health = POWER_SUPPLY_HEALTH_UNKNOWN;
540
541 ret = fuel_gauge_get_btemp(info, &temp);
542 if (ret < 0)
543 goto health_read_fail;
544
545 ret = fuel_gauge_get_vocv(info, &vocv);
546 if (ret < 0)
547 goto health_read_fail;
548
549 if (vocv > info->pdata->max_volt)
550 health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
551 else if (temp > info->pdata->max_temp)
552 health = POWER_SUPPLY_HEALTH_OVERHEAT;
553 else if (temp < info->pdata->min_temp)
554 health = POWER_SUPPLY_HEALTH_COLD;
555 else if (vocv < info->pdata->min_volt)
556 health = POWER_SUPPLY_HEALTH_DEAD;
557 else
558 health = POWER_SUPPLY_HEALTH_GOOD;
559
560health_read_fail:
561 return health;
562}
563
564static int fuel_gauge_set_high_btemp_alert(struct axp288_fg_info *info)
565{
566 int ret, adc_val;
567
568 /* program temperature threshold as 1/16 ADC value */
569 adc_val = temp_to_adc(info, info->pdata->max_temp);
570 ret = fuel_gauge_reg_writeb(info, AXP20X_V_HTF_DISCHRG, adc_val >> 4);
571
572 return ret;
573}
574
575static int fuel_gauge_set_low_btemp_alert(struct axp288_fg_info *info)
576{
577 int ret, adc_val;
578
579 /* program temperature threshold as 1/16 ADC value */
580 adc_val = temp_to_adc(info, info->pdata->min_temp);
581 ret = fuel_gauge_reg_writeb(info, AXP20X_V_LTF_DISCHRG, adc_val >> 4);
582
583 return ret;
584}
585
586static int fuel_gauge_get_property(struct power_supply *ps,
587 enum power_supply_property prop,
588 union power_supply_propval *val)
589{
297d716f 590 struct axp288_fg_info *info = power_supply_get_drvdata(ps);
5a5bf490
TB		 591 int ret = 0, value;
592
593 mutex_lock(&info->lock);
594 switch (prop) {
595 case POWER_SUPPLY_PROP_STATUS:
596 fuel_gauge_get_status(info);
597 val->intval = info->status;
598 break;
599 case POWER_SUPPLY_PROP_HEALTH:
600 val->intval = fuel_gauge_battery_health(info);
601 break;
602 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
603 ret = fuel_gauge_get_vbatt(info, &value);
604 if (ret < 0)
605 goto fuel_gauge_read_err;
606 val->intval = PROP_VOLT(value);
607 break;
608 case POWER_SUPPLY_PROP_VOLTAGE_OCV:
609 ret = fuel_gauge_get_vocv(info, &value);
610 if (ret < 0)
611 goto fuel_gauge_read_err;
612 val->intval = PROP_VOLT(value);
613 break;
614 case POWER_SUPPLY_PROP_CURRENT_NOW:
615 ret = fuel_gauge_get_current(info, &value);
616 if (ret < 0)
617 goto fuel_gauge_read_err;
618 val->intval = PROP_CURR(value);
619 break;
620 case POWER_SUPPLY_PROP_PRESENT:
621 ret = fuel_gauge_reg_readb(info, AXP20X_PWR_OP_MODE);
622 if (ret < 0)
623 goto fuel_gauge_read_err;
624
625 if (ret & CHRG_STAT_BAT_PRESENT)
626 val->intval = 1;
627 else
628 val->intval = 0;
629 break;
630 case POWER_SUPPLY_PROP_CAPACITY:
631 ret = fuel_gauge_reg_readb(info, AXP20X_FG_RES);
632 if (ret < 0)
633 goto fuel_gauge_read_err;
634
635 if (!(ret & FG_REP_CAP_VALID))
636 dev_err(&info->pdev->dev,
637 "capacity measurement not valid\n");
638 val->intval = (ret & FG_REP_CAP_VAL_MASK);
639 break;
640 case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
641 ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG);
642 if (ret < 0)
643 goto fuel_gauge_read_err;
644 val->intval = (ret & 0x0f);
645 break;
646 case POWER_SUPPLY_PROP_TEMP:
647 ret = fuel_gauge_get_btemp(info, &value);
648 if (ret < 0)
649 goto fuel_gauge_read_err;
650 val->intval = PROP_TEMP(value);
651 break;
652 case POWER_SUPPLY_PROP_TEMP_MAX:
653 case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
654 val->intval = PROP_TEMP(info->pdata->max_temp);
655 break;
656 case POWER_SUPPLY_PROP_TEMP_MIN:
657 case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
658 val->intval = PROP_TEMP(info->pdata->min_temp);
659 break;
660 case POWER_SUPPLY_PROP_TECHNOLOGY:
661 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
662 break;
663 case POWER_SUPPLY_PROP_CHARGE_NOW:
664 ret = fuel_gauge_reg_readb(info, AXP288_FG_CC_MTR1_REG);
665 if (ret < 0)
666 goto fuel_gauge_read_err;
667
668 value = (ret & FG_CC_MTR1_VAL_MASK) << 8;
669 ret = fuel_gauge_reg_readb(info, AXP288_FG_CC_MTR0_REG);
670 if (ret < 0)
671 goto fuel_gauge_read_err;
672 value |= (ret & FG_CC_MTR0_VAL_MASK);
673 val->intval = value * FG_DES_CAP_RES_LSB;
674 break;
675 case POWER_SUPPLY_PROP_CHARGE_FULL:
676 ret = fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP1_REG);
677 if (ret < 0)
678 goto fuel_gauge_read_err;
679
680 value = (ret & FG_DES_CAP1_VAL_MASK) << 8;
681 ret = fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP0_REG);
682 if (ret < 0)
683 goto fuel_gauge_read_err;
684 value |= (ret & FG_DES_CAP0_VAL_MASK);
685 val->intval = value * FG_DES_CAP_RES_LSB;
686 break;
687 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
688 val->intval = PROP_CURR(info->pdata->design_cap);
689 break;
690 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
691 val->intval = PROP_VOLT(info->pdata->max_volt);
692 break;
693 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
694 val->intval = PROP_VOLT(info->pdata->min_volt);
695 break;
696 case POWER_SUPPLY_PROP_MODEL_NAME:
697 val->strval = info->pdata->battid;
698 break;
699 default:
700 mutex_unlock(&info->lock);
701 return -EINVAL;
702 }
703
704 mutex_unlock(&info->lock);
705 return 0;
706
707fuel_gauge_read_err:
708 mutex_unlock(&info->lock);
709 return ret;
710}
711
712static int fuel_gauge_set_property(struct power_supply *ps,
713 enum power_supply_property prop,
714 const union power_supply_propval *val)
715{
297d716f 716 struct axp288_fg_info *info = power_supply_get_drvdata(ps);
5a5bf490
TB		 717 int ret = 0;
718
719 mutex_lock(&info->lock);
720 switch (prop) {
721 case POWER_SUPPLY_PROP_STATUS:
722 info->status = val->intval;
723 break;
724 case POWER_SUPPLY_PROP_TEMP_MIN:
725 case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
726 if ((val->intval < PD_DEF_MIN_TEMP) ||
727 (val->intval > PD_DEF_MAX_TEMP)) {
728 ret = -EINVAL;
729 break;
730 }
731 info->pdata->min_temp = UNPROP_TEMP(val->intval);
732 ret = fuel_gauge_set_low_btemp_alert(info);
733 if (ret < 0)
734 dev_err(&info->pdev->dev,
735 "temp alert min set fail:%d\n", ret);
736 break;
737 case POWER_SUPPLY_PROP_TEMP_MAX:
738 case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
739 if ((val->intval < PD_DEF_MIN_TEMP) ||
740 (val->intval > PD_DEF_MAX_TEMP)) {
741 ret = -EINVAL;
742 break;
743 }
744 info->pdata->max_temp = UNPROP_TEMP(val->intval);
745 ret = fuel_gauge_set_high_btemp_alert(info);
746 if (ret < 0)
747 dev_err(&info->pdev->dev,
748 "temp alert max set fail:%d\n", ret);
749 break;
750 case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
751 if ((val->intval < 0) || (val->intval > 15)) {
752 ret = -EINVAL;
753 break;
754 }
755 ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG);
756 if (ret < 0)
757 break;
758 ret &= 0xf0;
759 ret |= (val->intval & 0xf);
760 ret = fuel_gauge_reg_writeb(info, AXP288_FG_LOW_CAP_REG, ret);
761 break;
762 default:
763 ret = -EINVAL;
764 break;
765 }
766
767 mutex_unlock(&info->lock);
768 return ret;
769}
770
771static int fuel_gauge_property_is_writeable(struct power_supply *psy,
772 enum power_supply_property psp)
773{
774 int ret;
775
776 switch (psp) {
777 case POWER_SUPPLY_PROP_STATUS:
778 case POWER_SUPPLY_PROP_TEMP_MIN:
779 case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
780 case POWER_SUPPLY_PROP_TEMP_MAX:
781 case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
782 case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
783 ret = 1;
784 break;
785 default:
786 ret = 0;
787 }
788
789 return ret;
790}
791
792static void fuel_gauge_status_monitor(struct work_struct *work)
793{
794 struct axp288_fg_info *info = container_of(work,
795 struct axp288_fg_info, status_monitor.work);
796
797 fuel_gauge_get_status(info);
297d716f 798 power_supply_changed(info->bat);
5a5bf490
TB		 799 schedule_delayed_work(&info->status_monitor, STATUS_MON_DELAY_JIFFIES);
800}
801
802static irqreturn_t fuel_gauge_thread_handler(int irq, void *dev)
803{
804 struct axp288_fg_info *info = dev;
805 int i;
806
807 for (i = 0; i < AXP288_FG_INTR_NUM; i++) {
808 if (info->irq[i] == irq)
809 break;
810 }
811
812 if (i >= AXP288_FG_INTR_NUM) {
813 dev_warn(&info->pdev->dev, "spurious interrupt!!\n");
814 return IRQ_NONE;
815 }
816
817 switch (i) {
818 case QWBTU_IRQ:
819 dev_info(&info->pdev->dev,
820 "Quit Battery under temperature in work mode IRQ (QWBTU)\n");
821 break;
822 case WBTU_IRQ:
823 dev_info(&info->pdev->dev,
824 "Battery under temperature in work mode IRQ (WBTU)\n");
825 break;
826 case QWBTO_IRQ:
827 dev_info(&info->pdev->dev,
828 "Quit Battery over temperature in work mode IRQ (QWBTO)\n");
829 break;
830 case WBTO_IRQ:
831 dev_info(&info->pdev->dev,
832 "Battery over temperature in work mode IRQ (WBTO)\n");
833 break;
834 case WL2_IRQ:
835 dev_info(&info->pdev->dev, "Low Batt Warning(2) INTR\n");
836 break;
837 case WL1_IRQ:
838 dev_info(&info->pdev->dev, "Low Batt Warning(1) INTR\n");
839 break;
840 default:
841 dev_warn(&info->pdev->dev, "Spurious Interrupt!!!\n");
842 }
843
297d716f 844 power_supply_changed(info->bat);
5a5bf490
TB		 845 return IRQ_HANDLED;
846}
847
848static void fuel_gauge_external_power_changed(struct power_supply *psy)
849{
297d716f 850 struct axp288_fg_info *info = power_supply_get_drvdata(psy);
5a5bf490 851
297d716f 852 power_supply_changed(info->bat);
5a5bf490
TB		 853}
854
297d716f
KK		 855static const struct power_supply_desc fuel_gauge_desc = {
856 .name = DEV_NAME,
857 .type = POWER_SUPPLY_TYPE_BATTERY,
858 .properties = fuel_gauge_props,
859 .num_properties = ARRAY_SIZE(fuel_gauge_props),
860 .get_property = fuel_gauge_get_property,
861 .set_property = fuel_gauge_set_property,
862 .property_is_writeable = fuel_gauge_property_is_writeable,
863 .external_power_changed = fuel_gauge_external_power_changed,
864};
865
5a5bf490
TB		 866static int fuel_gauge_set_lowbatt_thresholds(struct axp288_fg_info *info)
867{
868 int ret;
869 u8 reg_val;
870
871 ret = fuel_gauge_reg_readb(info, AXP20X_FG_RES);
872 if (ret < 0) {
873 dev_err(&info->pdev->dev, "%s:read err:%d\n", __func__, ret);
874 return ret;
875 }
876 ret = (ret & FG_REP_CAP_VAL_MASK);
877
878 if (ret > FG_LOW_CAP_WARN_THR)
879 reg_val = FG_LOW_CAP_WARN_THR;
880 else if (ret > FG_LOW_CAP_CRIT_THR)
881 reg_val = FG_LOW_CAP_CRIT_THR;
882 else
883 reg_val = FG_LOW_CAP_SHDN_THR;
884
885 reg_val |= FG_LOW_CAP_THR1_VAL;
886 ret = fuel_gauge_reg_writeb(info, AXP288_FG_LOW_CAP_REG, reg_val);
887 if (ret < 0)
888 dev_err(&info->pdev->dev, "%s:write err:%d\n", __func__, ret);
889
890 return ret;
891}
892
893static int fuel_gauge_program_vbatt_full(struct axp288_fg_info *info)
894{
895 int ret;
896 u8 val;
897
898 ret = fuel_gauge_reg_readb(info, AXP20X_CHRG_CTRL1);
899 if (ret < 0)
900 goto fg_prog_ocv_fail;
901 else
902 val = (ret & ~CHRG_CCCV_CV_MASK);
903
904 switch (info->pdata->max_volt) {
905 case CV_4100:
906 val |= (CHRG_CCCV_CV_4100MV << CHRG_CCCV_CV_BIT_POS);
907 break;
908 case CV_4150:
909 val |= (CHRG_CCCV_CV_4150MV << CHRG_CCCV_CV_BIT_POS);
910 break;
911 case CV_4200:
912 val |= (CHRG_CCCV_CV_4200MV << CHRG_CCCV_CV_BIT_POS);
913 break;
914 case CV_4350:
915 val |= (CHRG_CCCV_CV_4350MV << CHRG_CCCV_CV_BIT_POS);
916 break;
917 default:
918 val |= (CHRG_CCCV_CV_4200MV << CHRG_CCCV_CV_BIT_POS);
919 break;
920 }
921
922 ret = fuel_gauge_reg_writeb(info, AXP20X_CHRG_CTRL1, val);
923fg_prog_ocv_fail:
924 return ret;
925}
926
927static int fuel_gauge_program_design_cap(struct axp288_fg_info *info)
928{
929 int ret;
930
931 ret = fuel_gauge_reg_writeb(info,
932 AXP288_FG_DES_CAP1_REG, info->pdata->cap1);
933 if (ret < 0)
934 goto fg_prog_descap_fail;
935
936 ret = fuel_gauge_reg_writeb(info,
937 AXP288_FG_DES_CAP0_REG, info->pdata->cap0);
938
939fg_prog_descap_fail:
940 return ret;
941}
942
943static int fuel_gauge_program_ocv_curve(struct axp288_fg_info *info)
944{
945 int ret = 0, i;
946
947 for (i = 0; i < OCV_CURVE_SIZE; i++) {
948 ret = fuel_gauge_reg_writeb(info,
949 AXP288_FG_OCV_CURVE_REG + i, info->pdata->ocv_curve[i]);
950 if (ret < 0)
951 goto fg_prog_ocv_fail;
952 }
953
954fg_prog_ocv_fail:
955 return ret;
956}
957
958static int fuel_gauge_program_rdc_vals(struct axp288_fg_info *info)
959{
960 int ret;
961
962 ret = fuel_gauge_reg_writeb(info,
963 AXP288_FG_RDC1_REG, info->pdata->rdc1);
964 if (ret < 0)
965 goto fg_prog_ocv_fail;
966
967 ret = fuel_gauge_reg_writeb(info,
968 AXP288_FG_RDC0_REG, info->pdata->rdc0);
969
970fg_prog_ocv_fail:
971 return ret;
972}
973
974static void fuel_gauge_init_config_regs(struct axp288_fg_info *info)
975{
976 int ret;
977
978 /*
979 * check if the config data is already
980 * programmed and if so just return.
981 */
982
983 ret = fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP1_REG);
984 if (ret < 0) {
985 dev_warn(&info->pdev->dev, "CAP1 reg read err!!\n");
986 } else if (!(ret & FG_DES_CAP1_VALID)) {
987 dev_info(&info->pdev->dev, "FG data needs to be initialized\n");
988 } else {
989 dev_info(&info->pdev->dev, "FG data is already initialized\n");
990 return;
991 }
992
993 ret = fuel_gauge_program_vbatt_full(info);
994 if (ret < 0)
995 dev_err(&info->pdev->dev, "set vbatt full fail:%d\n", ret);
996
997 ret = fuel_gauge_program_design_cap(info);
998 if (ret < 0)
999 dev_err(&info->pdev->dev, "set design cap fail:%d\n", ret);
1000
1001 ret = fuel_gauge_program_rdc_vals(info);
1002 if (ret < 0)
1003 dev_err(&info->pdev->dev, "set rdc fail:%d\n", ret);
1004
1005 ret = fuel_gauge_program_ocv_curve(info);
1006 if (ret < 0)
1007 dev_err(&info->pdev->dev, "set ocv curve fail:%d\n", ret);
1008
1009 ret = fuel_gauge_set_lowbatt_thresholds(info);
1010 if (ret < 0)
1011 dev_err(&info->pdev->dev, "lowbatt thr set fail:%d\n", ret);
1012
1013 ret = fuel_gauge_reg_writeb(info, AXP20X_CC_CTRL, 0xef);
1014 if (ret < 0)
1015 dev_err(&info->pdev->dev, "gauge cntl set fail:%d\n", ret);
1016}
1017
1018static void fuel_gauge_init_irq(struct axp288_fg_info *info)
1019{
1020 int ret, i, pirq;
1021
1022 for (i = 0; i < AXP288_FG_INTR_NUM; i++) {
1023 pirq = platform_get_irq(info->pdev, i);
1024 info->irq[i] = regmap_irq_get_virq(info->regmap_irqc, pirq);
1025 if (info->irq[i] < 0) {
1026 dev_warn(&info->pdev->dev,
1027 "regmap_irq get virq failed for IRQ %d: %d\n",
1028 pirq, info->irq[i]);
1029 info->irq[i] = -1;
1030 goto intr_failed;
1031 }
1032 ret = request_threaded_irq(info->irq[i],
1033 NULL, fuel_gauge_thread_handler,
1034 IRQF_ONESHOT, DEV_NAME, info);
1035 if (ret) {
1036 dev_warn(&info->pdev->dev,
1037 "request irq failed for IRQ %d: %d\n",
1038 pirq, info->irq[i]);
1039 info->irq[i] = -1;
1040 goto intr_failed;
1041 } else {
1042 dev_info(&info->pdev->dev, "HW IRQ %d -> VIRQ %d\n",
1043 pirq, info->irq[i]);
1044 }
1045 }
1046 return;
1047
1048intr_failed:
1049 for (; i > 0; i--) {
1050 free_irq(info->irq[i - 1], info);
1051 info->irq[i - 1] = -1;
1052 }
1053}
1054
1055static void fuel_gauge_init_hw_regs(struct axp288_fg_info *info)
1056{
1057 int ret;
1058 unsigned int val;
1059
1060 ret = fuel_gauge_set_high_btemp_alert(info);
1061 if (ret < 0)
1062 dev_err(&info->pdev->dev, "high batt temp set fail:%d\n", ret);
1063
1064 ret = fuel_gauge_set_low_btemp_alert(info);
1065 if (ret < 0)
1066 dev_err(&info->pdev->dev, "low batt temp set fail:%d\n", ret);
1067
1068 /* enable interrupts */
1069 val = fuel_gauge_reg_readb(info, AXP20X_IRQ3_EN);
1070 val |= TEMP_IRQ_CFG_MASK;
1071 fuel_gauge_reg_writeb(info, AXP20X_IRQ3_EN, val);
1072
1073 val = fuel_gauge_reg_readb(info, AXP20X_IRQ4_EN);
1074 val |= FG_IRQ_CFG_LOWBATT_MASK;
1075 val = fuel_gauge_reg_writeb(info, AXP20X_IRQ4_EN, val);
1076}
1077
1078static int axp288_fuel_gauge_probe(struct platform_device *pdev)
1079{
297d716f 1080 int ret = 0;
5a5bf490
TB		 1081 struct axp288_fg_info *info;
1082 struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
297d716f 1083 struct power_supply_config psy_cfg = {};
5a5bf490
TB		 1084
1085 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
1086 if (!info)
1087 return -ENOMEM;
1088
1089 info->pdev = pdev;
1090 info->regmap = axp20x->regmap;
1091 info->regmap_irqc = axp20x->regmap_irqc;
1092 info->status = POWER_SUPPLY_STATUS_UNKNOWN;
1093 info->pdata = pdev->dev.platform_data;
1094 if (!info->pdata)
1095 return -ENODEV;
1096
1097 platform_set_drvdata(pdev, info);
1098
1099 mutex_init(&info->lock);
1100 INIT_DELAYED_WORK(&info->status_monitor, fuel_gauge_status_monitor);
1101
297d716f
KK		 1102 psy_cfg.drv_data = info;
1103 info->bat = power_supply_register(&pdev->dev, &fuel_gauge_desc, &psy_cfg);
1104 if (IS_ERR(info->bat)) {
1105 ret = PTR_ERR(info->bat);
5a5bf490
TB		 1106 dev_err(&pdev->dev, "failed to register battery: %d\n", ret);
1107 return ret;
1108 }
1109
1110 fuel_gauge_create_debugfs(info);
1111 fuel_gauge_init_config_regs(info);
1112 fuel_gauge_init_irq(info);
1113 fuel_gauge_init_hw_regs(info);
1114 schedule_delayed_work(&info->status_monitor, STATUS_MON_DELAY_JIFFIES);
1115
1116 return ret;
1117}
1118
f1f27a4a 1119static const struct platform_device_id axp288_fg_id_table[] = {
5a5bf490
TB		 1120 { .name = DEV_NAME },
1121 {},
1122};
1123
1124static int axp288_fuel_gauge_remove(struct platform_device *pdev)
1125{
1126 struct axp288_fg_info *info = platform_get_drvdata(pdev);
1127 int i;
1128
1129 cancel_delayed_work_sync(&info->status_monitor);
297d716f 1130 power_supply_unregister(info->bat);
5a5bf490
TB		 1131 fuel_gauge_remove_debugfs(info);
1132
1133 for (i = 0; i < AXP288_FG_INTR_NUM; i++)
1134 if (info->irq[i] >= 0)
1135 free_irq(info->irq[i], info);
1136
1137 return 0;
1138}
1139
1140static struct platform_driver axp288_fuel_gauge_driver = {
1141 .probe = axp288_fuel_gauge_probe,
1142 .remove = axp288_fuel_gauge_remove,
1143 .id_table = axp288_fg_id_table,
1144 .driver = {
1145 .name = DEV_NAME,
1146 },
1147};
1148
1149module_platform_driver(axp288_fuel_gauge_driver);
1150
409e718e 1151MODULE_AUTHOR("Ramakrishna Pallala <ramakrishna.pallala@intel.com>");
5a5bf490
TB		 1152MODULE_AUTHOR("Todd Brandt <todd.e.brandt@linux.intel.com>");
1153MODULE_DESCRIPTION("Xpower AXP288 Fuel Gauge Driver");
1154MODULE_LICENSE("GPL");
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