1 /*
2 * Batttery Driver for Dialog DA9052 PMICs
3 *
4 * Copyright(c) 2011 Dialog Semiconductor Ltd.
5 *
6 * Author: David Dajun Chen <dchen@diasemi.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 */
13
14 #include <linux/delay.h>
15 #include <linux/freezer.h>
16 #include <linux/fs.h>
17 #include <linux/jiffies.h>
18 #include <linux/module.h>
19 #include <linux/timer.h>
20 #include <linux/uaccess.h>
21 #include <linux/platform_device.h>
22 #include <linux/power_supply.h>
23
24 #include <linux/mfd/da9052/da9052.h>
25 #include <linux/mfd/da9052/pdata.h>
26 #include <linux/mfd/da9052/reg.h>
27
28 /* STATIC CONFIGURATION */
29 #define DA9052_BAT_CUTOFF_VOLT 2800
30 #define DA9052_BAT_TSH 62000
31 #define DA9052_BAT_LOW_CAP 4
32 #define DA9052_AVG_SZ 4
33 #define DA9052_VC_TBL_SZ 68
34 #define DA9052_VC_TBL_REF_SZ 3
35
36 #define DA9052_ISET_USB_MASK 0x0F
37 #define DA9052_CHG_USB_ILIM_MASK 0x40
38 #define DA9052_CHG_LIM_COLS 16
39
40 #define DA9052_MEAN(x, y) ((x + y) / 2)
41
42 enum charger_type_enum {
43 DA9052_NOCHARGER = 1,
44 DA9052_CHARGER,
45 };
46
47 static const u16 da9052_chg_current_lim[2][DA9052_CHG_LIM_COLS] = {
48 {70, 80, 90, 100, 110, 120, 400, 450,
49 500, 550, 600, 650, 700, 900, 1100, 1300},
50 {80, 90, 100, 110, 120, 400, 450, 500,
51 550, 600, 800, 1000, 1200, 1400, 1600, 1800},
52 };
53
54 static const u16 vc_tbl_ref[3] = {10, 25, 40};
55 /* Lookup table for voltage vs capacity */
56 static u32 const vc_tbl[3][68][2] = {
57 /* For temperature 10 degree Celsius */
58 {
59 {4082, 100}, {4036, 98},
60 {4020, 96}, {4008, 95},
61 {3997, 93}, {3983, 91},
62 {3964, 90}, {3943, 88},
63 {3926, 87}, {3912, 85},
64 {3900, 84}, {3890, 82},
65 {3881, 80}, {3873, 79},
66 {3865, 77}, {3857, 76},
67 {3848, 74}, {3839, 73},
68 {3829, 71}, {3820, 70},
69 {3811, 68}, {3802, 67},
70 {3794, 65}, {3785, 64},
71 {3778, 62}, {3770, 61},
72 {3763, 59}, {3756, 58},
73 {3750, 56}, {3744, 55},
74 {3738, 53}, {3732, 52},
75 {3727, 50}, {3722, 49},
76 {3717, 47}, {3712, 46},
77 {3708, 44}, {3703, 43},
78 {3700, 41}, {3696, 40},
79 {3693, 38}, {3691, 37},
80 {3688, 35}, {3686, 34},
81 {3683, 32}, {3681, 31},
82 {3678, 29}, {3675, 28},
83 {3672, 26}, {3669, 25},
84 {3665, 23}, {3661, 22},
85 {3656, 21}, {3651, 19},
86 {3645, 18}, {3639, 16},
87 {3631, 15}, {3622, 13},
88 {3611, 12}, {3600, 10},
89 {3587, 9}, {3572, 7},
90 {3548, 6}, {3503, 5},
91 {3420, 3}, {3268, 2},
92 {2992, 1}, {2746, 0}
93 },
94 /* For temperature 25 degree Celsius */
95 {
96 {4102, 100}, {4065, 98},
97 {4048, 96}, {4034, 95},
98 {4021, 93}, {4011, 92},
99 {4001, 90}, {3986, 88},
100 {3968, 87}, {3952, 85},
101 {3938, 84}, {3926, 82},
102 {3916, 81}, {3908, 79},
103 {3900, 77}, {3892, 76},
104 {3883, 74}, {3874, 73},
105 {3864, 71}, {3855, 70},
106 {3846, 68}, {3836, 67},
107 {3827, 65}, {3819, 64},
108 {3810, 62}, {3801, 61},
109 {3793, 59}, {3786, 58},
110 {3778, 56}, {3772, 55},
111 {3765, 53}, {3759, 52},
112 {3754, 50}, {3748, 49},
113 {3743, 47}, {3738, 46},
114 {3733, 44}, {3728, 43},
115 {3724, 41}, {3720, 40},
116 {3716, 38}, {3712, 37},
117 {3709, 35}, {3706, 34},
118 {3703, 33}, {3701, 31},
119 {3698, 30}, {3696, 28},
120 {3693, 27}, {3690, 25},
121 {3687, 24}, {3683, 22},
122 {3680, 21}, {3675, 19},
123 {3671, 18}, {3666, 17},
124 {3660, 15}, {3654, 14},
125 {3647, 12}, {3639, 11},
126 {3630, 9}, {3621, 8},
127 {3613, 6}, {3606, 5},
128 {3597, 4}, {3582, 2},
129 {3546, 1}, {2747, 0}
130 },
131 /* For temperature 40 degree Celsius */
132 {
133 {4114, 100}, {4081, 98},
134 {4065, 96}, {4050, 95},
135 {4036, 93}, {4024, 92},
136 {4013, 90}, {4002, 88},
137 {3990, 87}, {3976, 85},
138 {3962, 84}, {3950, 82},
139 {3939, 81}, {3930, 79},
140 {3921, 77}, {3912, 76},
141 {3902, 74}, {3893, 73},
142 {3883, 71}, {3874, 70},
143 {3865, 68}, {3856, 67},
144 {3847, 65}, {3838, 64},
145 {3829, 62}, {3820, 61},
146 {3812, 59}, {3803, 58},
147 {3795, 56}, {3787, 55},
148 {3780, 53}, {3773, 52},
149 {3767, 50}, {3761, 49},
150 {3756, 47}, {3751, 46},
151 {3746, 44}, {3741, 43},
152 {3736, 41}, {3732, 40},
153 {3728, 38}, {3724, 37},
154 {3720, 35}, {3716, 34},
155 {3713, 33}, {3710, 31},
156 {3707, 30}, {3704, 28},
157 {3701, 27}, {3698, 25},
158 {3695, 24}, {3691, 22},
159 {3686, 21}, {3681, 19},
160 {3676, 18}, {3671, 17},
161 {3666, 15}, {3661, 14},
162 {3655, 12}, {3648, 11},
163 {3640, 9}, {3632, 8},
164 {3622, 6}, {3616, 5},
165 {3611, 4}, {3604, 2},
166 {3594, 1}, {2747, 0}
167 }
168 };
169
170 struct da9052_battery {
171 struct da9052 *da9052;
172 struct power_supply psy;
173 struct notifier_block nb;
174 int charger_type;
175 int status;
176 int health;
177 };
178
volt_reg_to_mV(int value)179 static inline int volt_reg_to_mV(int value)
180 {
181 return ((value * 1000) / 512) + 2500;
182 }
183
ichg_reg_to_mA(int value)184 static inline int ichg_reg_to_mA(int value)
185 {
186 return (value * 3900) / 1000;
187 }
188
da9052_read_chgend_current(struct da9052_battery * bat,int * current_mA)189 static int da9052_read_chgend_current(struct da9052_battery *bat,
190 int *current_mA)
191 {
192 int ret;
193
194 if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING)
195 return -EINVAL;
196
197 ret = da9052_reg_read(bat->da9052, DA9052_ICHG_END_REG);
198 if (ret < 0)
199 return ret;
200
201 *current_mA = ichg_reg_to_mA(ret & DA9052_ICHGEND_ICHGEND);
202
203 return 0;
204 }
205
da9052_read_chg_current(struct da9052_battery * bat,int * current_mA)206 static int da9052_read_chg_current(struct da9052_battery *bat, int *current_mA)
207 {
208 int ret;
209
210 if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING)
211 return -EINVAL;
212
213 ret = da9052_reg_read(bat->da9052, DA9052_ICHG_AV_REG);
214 if (ret < 0)
215 return ret;
216
217 *current_mA = ichg_reg_to_mA(ret & DA9052_ICHGAV_ICHGAV);
218
219 return 0;
220 }
221
da9052_bat_check_status(struct da9052_battery * bat,int * status)222 static int da9052_bat_check_status(struct da9052_battery *bat, int *status)
223 {
224 u8 v[2] = {0, 0};
225 u8 bat_status;
226 u8 chg_end;
227 int ret;
228 int chg_current;
229 int chg_end_current;
230 bool dcinsel;
231 bool dcindet;
232 bool vbussel;
233 bool vbusdet;
234 bool dc;
235 bool vbus;
236
237 ret = da9052_group_read(bat->da9052, DA9052_STATUS_A_REG, 2, v);
238 if (ret < 0)
239 return ret;
240
241 bat_status = v[0];
242 chg_end = v[1];
243
244 dcinsel = bat_status & DA9052_STATUSA_DCINSEL;
245 dcindet = bat_status & DA9052_STATUSA_DCINDET;
246 vbussel = bat_status & DA9052_STATUSA_VBUSSEL;
247 vbusdet = bat_status & DA9052_STATUSA_VBUSDET;
248 dc = dcinsel && dcindet;
249 vbus = vbussel && vbusdet;
250
251 /* Preference to WALL(DCIN) charger unit */
252 if (dc || vbus) {
253 bat->charger_type = DA9052_CHARGER;
254
255 /* If charging end flag is set and Charging current is greater
256 * than charging end limit then battery is charging
257 */
258 if ((chg_end & DA9052_STATUSB_CHGEND) != 0) {
259 ret = da9052_read_chg_current(bat, &chg_current);
260 if (ret < 0)
261 return ret;
262 ret = da9052_read_chgend_current(bat, &chg_end_current);
263 if (ret < 0)
264 return ret;
265
266 if (chg_current >= chg_end_current)
267 bat->status = POWER_SUPPLY_STATUS_CHARGING;
268 else
269 bat->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
270 } else {
271 /* If Charging end flag is cleared then battery is
272 * charging
273 */
274 bat->status = POWER_SUPPLY_STATUS_CHARGING;
275 }
276 } else if (dcindet || vbusdet) {
277 bat->charger_type = DA9052_CHARGER;
278 bat->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
279 } else {
280 bat->charger_type = DA9052_NOCHARGER;
281 bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
282 }
283
284 if (status != NULL)
285 *status = bat->status;
286 return 0;
287 }
288
da9052_bat_read_volt(struct da9052_battery * bat,int * volt_mV)289 static int da9052_bat_read_volt(struct da9052_battery *bat, int *volt_mV)
290 {
291 int volt;
292
293 volt = da9052_adc_manual_read(bat->da9052, DA9052_ADC_MAN_MUXSEL_VBAT);
294 if (volt < 0)
295 return volt;
296
297 *volt_mV = volt_reg_to_mV(volt);
298
299 return 0;
300 }
301
da9052_bat_check_presence(struct da9052_battery * bat,int * illegal)302 static int da9052_bat_check_presence(struct da9052_battery *bat, int *illegal)
303 {
304 int bat_temp;
305
306 bat_temp = da9052_adc_read_temp(bat->da9052);
307 if (bat_temp < 0)
308 return bat_temp;
309
310 if (bat_temp > DA9052_BAT_TSH)
311 *illegal = 1;
312 else
313 *illegal = 0;
314
315 return 0;
316 }
317
da9052_bat_interpolate(int vbat_lower,int vbat_upper,int level_lower,int level_upper,int bat_voltage)318 static int da9052_bat_interpolate(int vbat_lower, int vbat_upper,
319 int level_lower, int level_upper,
320 int bat_voltage)
321 {
322 int tmp;
323
324 tmp = ((level_upper - level_lower) * 1000) / (vbat_upper - vbat_lower);
325 tmp = level_lower + (((bat_voltage - vbat_lower) * tmp) / 1000);
326
327 return tmp;
328 }
329
da9052_determine_vc_tbl_index(unsigned char adc_temp)330 unsigned char da9052_determine_vc_tbl_index(unsigned char adc_temp)
331 {
332 int i;
333
334 if (adc_temp <= vc_tbl_ref[0])
335 return 0;
336
337 if (adc_temp > vc_tbl_ref[DA9052_VC_TBL_REF_SZ - 1])
338 return DA9052_VC_TBL_REF_SZ - 1;
339
340 for (i = 0; i < DA9052_VC_TBL_REF_SZ; i++) {
341 if ((adc_temp > vc_tbl_ref[i]) &&
342 (adc_temp <= DA9052_MEAN(vc_tbl_ref[i], vc_tbl_ref[i + 1])))
343 return i;
344 if ((adc_temp > DA9052_MEAN(vc_tbl_ref[i], vc_tbl_ref[i + 1]))
345 && (adc_temp <= vc_tbl_ref[i]))
346 return i + 1;
347 }
348 }
349
da9052_bat_read_capacity(struct da9052_battery * bat,int * capacity)350 static int da9052_bat_read_capacity(struct da9052_battery *bat, int *capacity)
351 {
352 int adc_temp;
353 int bat_voltage;
354 int vbat_lower;
355 int vbat_upper;
356 int level_upper;
357 int level_lower;
358 int ret;
359 int flag;
360 int i = 0;
361 int j;
362
363 ret = da9052_bat_read_volt(bat, &bat_voltage);
364 if (ret < 0)
365 return ret;
366
367 adc_temp = da9052_adc_read_temp(bat->da9052);
368 if (adc_temp < 0)
369 return adc_temp;
370
371 i = da9052_determine_vc_tbl_index(adc_temp);
372
373 if (bat_voltage >= vc_tbl[i][0][0]) {
374 *capacity = 100;
375 return 0;
376 }
377 if (bat_voltage <= vc_tbl[i][DA9052_VC_TBL_SZ - 1][0]) {
378 *capacity = 0;
379 return 0;
380 }
381 flag = 0;
382
383 for (j = 0; j < (DA9052_VC_TBL_SZ-1); j++) {
384 if ((bat_voltage <= vc_tbl[i][j][0]) &&
385 (bat_voltage >= vc_tbl[i][j + 1][0])) {
386 vbat_upper = vc_tbl[i][j][0];
387 vbat_lower = vc_tbl[i][j + 1][0];
388 level_upper = vc_tbl[i][j][1];
389 level_lower = vc_tbl[i][j + 1][1];
390 flag = 1;
391 break;
392 }
393 }
394 if (!flag)
395 return -EIO;
396
397 *capacity = da9052_bat_interpolate(vbat_lower, vbat_upper, level_lower,
398 level_upper, bat_voltage);
399
400 return 0;
401 }
402
da9052_bat_check_health(struct da9052_battery * bat,int * health)403 static int da9052_bat_check_health(struct da9052_battery *bat, int *health)
404 {
405 int ret;
406 int bat_illegal;
407 int capacity;
408
409 ret = da9052_bat_check_presence(bat, &bat_illegal);
410 if (ret < 0)
411 return ret;
412
413 if (bat_illegal) {
414 bat->health = POWER_SUPPLY_HEALTH_UNKNOWN;
415 return 0;
416 }
417
418 if (bat->health != POWER_SUPPLY_HEALTH_OVERHEAT) {
419 ret = da9052_bat_read_capacity(bat, &capacity);
420 if (ret < 0)
421 return ret;
422 if (capacity < DA9052_BAT_LOW_CAP)
423 bat->health = POWER_SUPPLY_HEALTH_DEAD;
424 else
425 bat->health = POWER_SUPPLY_HEALTH_GOOD;
426 }
427
428 *health = bat->health;
429
430 return 0;
431 }
432
da9052_bat_irq(int irq,void * data)433 static irqreturn_t da9052_bat_irq(int irq, void *data)
434 {
435 struct da9052_battery *bat = data;
436
437 irq -= bat->da9052->irq_base;
438
439 if (irq == DA9052_IRQ_CHGEND)
440 bat->status = POWER_SUPPLY_STATUS_FULL;
441 else
442 da9052_bat_check_status(bat, NULL);
443
444 if (irq == DA9052_IRQ_CHGEND || irq == DA9052_IRQ_DCIN ||
445 irq == DA9052_IRQ_VBUS || irq == DA9052_IRQ_TBAT) {
446 power_supply_changed(&bat->psy);
447 }
448
449 return IRQ_HANDLED;
450 }
451
da9052_USB_current_notifier(struct notifier_block * nb,unsigned long events,void * data)452 static int da9052_USB_current_notifier(struct notifier_block *nb,
453 unsigned long events, void *data)
454 {
455 u8 row;
456 u8 col;
457 int *current_mA = data;
458 int ret;
459 struct da9052_battery *bat = container_of(nb, struct da9052_battery,
460 nb);
461
462 if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING)
463 return -EPERM;
464
465 ret = da9052_reg_read(bat->da9052, DA9052_CHGBUCK_REG);
466 if (ret & DA9052_CHG_USB_ILIM_MASK)
467 return -EPERM;
468
469 if (bat->da9052->chip_id == DA9052)
470 row = 0;
471 else
472 row = 1;
473
474 if (*current_mA < da9052_chg_current_lim[row][0] ||
475 *current_mA > da9052_chg_current_lim[row][DA9052_CHG_LIM_COLS - 1])
476 return -EINVAL;
477
478 for (col = 0; col <= DA9052_CHG_LIM_COLS - 1 ; col++) {
479 if (*current_mA <= da9052_chg_current_lim[row][col])
480 break;
481 }
482
483 return da9052_reg_update(bat->da9052, DA9052_ISET_REG,
484 DA9052_ISET_USB_MASK, col);
485 }
486
da9052_bat_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)487 static int da9052_bat_get_property(struct power_supply *psy,
488 enum power_supply_property psp,
489 union power_supply_propval *val)
490 {
491 int ret;
492 int illegal;
493 struct da9052_battery *bat = container_of(psy, struct da9052_battery,
494 psy);
495
496 ret = da9052_bat_check_presence(bat, &illegal);
497 if (ret < 0)
498 return ret;
499
500 if (illegal && psp != POWER_SUPPLY_PROP_PRESENT)
501 return -ENODEV;
502
503 switch (psp) {
504 case POWER_SUPPLY_PROP_STATUS:
505 ret = da9052_bat_check_status(bat, &val->intval);
506 break;
507 case POWER_SUPPLY_PROP_ONLINE:
508 val->intval =
509 (bat->charger_type == DA9052_NOCHARGER) ? 0 : 1;
510 break;
511 case POWER_SUPPLY_PROP_PRESENT:
512 ret = da9052_bat_check_presence(bat, &val->intval);
513 break;
514 case POWER_SUPPLY_PROP_HEALTH:
515 ret = da9052_bat_check_health(bat, &val->intval);
516 break;
517 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
518 val->intval = DA9052_BAT_CUTOFF_VOLT * 1000;
519 break;
520 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
521 ret = da9052_bat_read_volt(bat, &val->intval);
522 break;
523 case POWER_SUPPLY_PROP_CURRENT_AVG:
524 ret = da9052_read_chg_current(bat, &val->intval);
525 break;
526 case POWER_SUPPLY_PROP_CAPACITY:
527 ret = da9052_bat_read_capacity(bat, &val->intval);
528 break;
529 case POWER_SUPPLY_PROP_TEMP:
530 val->intval = da9052_adc_read_temp(bat->da9052);
531 ret = val->intval;
532 break;
533 case POWER_SUPPLY_PROP_TECHNOLOGY:
534 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
535 break;
536 default:
537 return -EINVAL;
538 }
539 return ret;
540 }
541
542 static enum power_supply_property da9052_bat_props[] = {
543 POWER_SUPPLY_PROP_STATUS,
544 POWER_SUPPLY_PROP_ONLINE,
545 POWER_SUPPLY_PROP_PRESENT,
546 POWER_SUPPLY_PROP_HEALTH,
547 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
548 POWER_SUPPLY_PROP_VOLTAGE_AVG,
549 POWER_SUPPLY_PROP_CURRENT_AVG,
550 POWER_SUPPLY_PROP_CAPACITY,
551 POWER_SUPPLY_PROP_TEMP,
552 POWER_SUPPLY_PROP_TECHNOLOGY,
553 };
554
555 static struct power_supply template_battery = {
556 .name = "da9052-bat",
557 .type = POWER_SUPPLY_TYPE_BATTERY,
558 .properties = da9052_bat_props,
559 .num_properties = ARRAY_SIZE(da9052_bat_props),
560 .get_property = da9052_bat_get_property,
561 };
562
563 static const char *const da9052_bat_irqs[] = {
564 "BATT TEMP",
565 "DCIN DET",
566 "DCIN REM",
567 "VBUS DET",
568 "VBUS REM",
569 "CHG END",
570 };
571
da9052_bat_probe(struct platform_device * pdev)572 static s32 __devinit da9052_bat_probe(struct platform_device *pdev)
573 {
574 struct da9052_pdata *pdata;
575 struct da9052_battery *bat;
576 int ret;
577 int irq;
578 int i;
579
580 bat = kzalloc(sizeof(struct da9052_battery), GFP_KERNEL);
581 if (!bat)
582 return -ENOMEM;
583
584 bat->da9052 = dev_get_drvdata(pdev->dev.parent);
585 bat->psy = template_battery;
586 bat->charger_type = DA9052_NOCHARGER;
587 bat->status = POWER_SUPPLY_STATUS_UNKNOWN;
588 bat->health = POWER_SUPPLY_HEALTH_UNKNOWN;
589 bat->nb.notifier_call = da9052_USB_current_notifier;
590
591 pdata = bat->da9052->dev->platform_data;
592 if (pdata != NULL && pdata->use_for_apm)
593 bat->psy.use_for_apm = pdata->use_for_apm;
594 else
595 bat->psy.use_for_apm = 1;
596
597 for (i = 0; i < ARRAY_SIZE(da9052_bat_irqs); i++) {
598 irq = platform_get_irq_byname(pdev, da9052_bat_irqs[i]);
599 ret = request_threaded_irq(bat->da9052->irq_base + irq,
600 NULL, da9052_bat_irq,
601 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
602 da9052_bat_irqs[i], bat);
603 if (ret != 0) {
604 dev_err(bat->da9052->dev,
605 "DA9052 failed to request %s IRQ %d: %d\n",
606 da9052_bat_irqs[i], irq, ret);
607 goto err;
608 }
609 }
610
611 ret = power_supply_register(&pdev->dev, &bat->psy);
612 if (ret)
613 goto err;
614
615 return 0;
616
617 err:
618 for (; i >= 0; i--) {
619 irq = platform_get_irq_byname(pdev, da9052_bat_irqs[i]);
620 free_irq(bat->da9052->irq_base + irq, bat);
621 }
622 kfree(bat);
623 return ret;
624 }
da9052_bat_remove(struct platform_device * pdev)625 static int __devexit da9052_bat_remove(struct platform_device *pdev)
626 {
627 int i;
628 int irq;
629 struct da9052_battery *bat = platform_get_drvdata(pdev);
630
631 for (i = 0; i < ARRAY_SIZE(da9052_bat_irqs); i++) {
632 irq = platform_get_irq_byname(pdev, da9052_bat_irqs[i]);
633 free_irq(bat->da9052->irq_base + irq, bat);
634 }
635 power_supply_unregister(&bat->psy);
636
637 return 0;
638 }
639
640 static struct platform_driver da9052_bat_driver = {
641 .probe = da9052_bat_probe,
642 .remove = __devexit_p(da9052_bat_remove),
643 .driver = {
644 .name = "da9052-bat",
645 .owner = THIS_MODULE,
646 },
647 };
648
da9052_bat_init(void)649 static int __init da9052_bat_init(void)
650 {
651 return platform_driver_register(&da9052_bat_driver);
652 }
653 module_init(da9052_bat_init);
654
da9052_bat_exit(void)655 static void __exit da9052_bat_exit(void)
656 {
657 platform_driver_unregister(&da9052_bat_driver);
658 }
659 module_exit(da9052_bat_exit);
660
661 MODULE_DESCRIPTION("DA9052 BAT Device Driver");
662 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
663 MODULE_LICENSE("GPL");
664 MODULE_ALIAS("platform:da9052-bat");
665