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1 /*
2  * Driver for batteries with DS2760 chips inside.
3  *
4  * Copyright © 2007 Anton Vorontsov
5  *             2004-2007 Matt Reimer
6  *             2004 Szabolcs Gyurko
7  *
8  * Use consistent with the GNU GPL is permitted,
9  * provided that this copyright notice is
10  * preserved in its entirety in all copies and derived works.
11  *
12  * Author:  Anton Vorontsov <cbou@mail.ru>
13  *          February 2007
14  *
15  *          Matt Reimer <mreimer@vpop.net>
16  *          April 2004, 2005, 2007
17  *
18  *          Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>
19  *          September 2004
20  */
21
22 #include <linux/module.h>
23 #include <linux/param.h>
24 #include <linux/jiffies.h>
25 #include <linux/workqueue.h>
26 #include <linux/pm.h>
27 #include <linux/slab.h>
28 #include <linux/platform_device.h>
29 #include <linux/power_supply.h>
30
31 #include "../w1/w1.h"
32 #include "../w1/slaves/w1_ds2760.h"
33
34 struct ds2760_device_info {
35         struct device *dev;
36
37         /* DS2760 data, valid after calling ds2760_battery_read_status() */
38         unsigned long update_time;      /* jiffies when data read */
39         char raw[DS2760_DATA_SIZE];     /* raw DS2760 data */
40         int voltage_raw;                /* units of 4.88 mV */
41         int voltage_uV;                 /* units of µV */
42         int current_raw;                /* units of 0.625 mA */
43         int current_uA;                 /* units of µA */
44         int accum_current_raw;          /* units of 0.25 mAh */
45         int accum_current_uAh;          /* units of µAh */
46         int temp_raw;                   /* units of 0.125 °C */
47         int temp_C;                     /* units of 0.1 °C */
48         int rated_capacity;             /* units of µAh */
49         int rem_capacity;               /* percentage */
50         int full_active_uAh;            /* units of µAh */
51         int empty_uAh;                  /* units of µAh */
52         int life_sec;                   /* units of seconds */
53         int charge_status;              /* POWER_SUPPLY_STATUS_* */
54
55         int full_counter;
56         struct power_supply bat;
57         struct device *w1_dev;
58         struct workqueue_struct *monitor_wqueue;
59         struct delayed_work monitor_work;
60         struct delayed_work set_charged_work;
61 };
62
63 static unsigned int cache_time = 1000;
64 module_param(cache_time, uint, 0644);
65 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
66
67 static unsigned int pmod_enabled;
68 module_param(pmod_enabled, bool, 0644);
69 MODULE_PARM_DESC(pmod_enabled, "PMOD enable bit");
70
71 static unsigned int rated_capacity;
72 module_param(rated_capacity, uint, 0644);
73 MODULE_PARM_DESC(rated_capacity, "rated battery capacity, 10*mAh or index");
74
75 static unsigned int current_accum;
76 module_param(current_accum, uint, 0644);
77 MODULE_PARM_DESC(current_accum, "current accumulator value");
78
79 /* Some batteries have their rated capacity stored a N * 10 mAh, while
80  * others use an index into this table. */
81 static int rated_capacities[] = {
82         0,
83         920,    /* Samsung */
84         920,    /* BYD */
85         920,    /* Lishen */
86         920,    /* NEC */
87         1440,   /* Samsung */
88         1440,   /* BYD */
89 #ifdef CONFIG_MACH_H4700
90         1800,   /* HP iPAQ hx4700 3.7V 1800mAh (359113-001) */
91 #else
92         1440,   /* Lishen */
93 #endif
94         1440,   /* NEC */
95         2880,   /* Samsung */
96         2880,   /* BYD */
97         2880,   /* Lishen */
98         2880    /* NEC */
99 };
100
101 /* array is level at temps 0°C, 10°C, 20°C, 30°C, 40°C
102  * temp is in Celsius */
103 static int battery_interpolate(int array[], int temp)
104 {
105         int index, dt;
106
107         if (temp <= 0)
108                 return array[0];
109         if (temp >= 40)
110                 return array[4];
111
112         index = temp / 10;
113         dt    = temp % 10;
114
115         return array[index] + (((array[index + 1] - array[index]) * dt) / 10);
116 }
117
118 static int ds2760_battery_read_status(struct ds2760_device_info *di)
119 {
120         int ret, i, start, count, scale[5];
121
122         if (di->update_time && time_before(jiffies, di->update_time +
123                                            msecs_to_jiffies(cache_time)))
124                 return 0;
125
126         /* The first time we read the entire contents of SRAM/EEPROM,
127          * but after that we just read the interesting bits that change. */
128         if (di->update_time == 0) {
129                 start = 0;
130                 count = DS2760_DATA_SIZE;
131         } else {
132                 start = DS2760_VOLTAGE_MSB;
133                 count = DS2760_TEMP_LSB - start + 1;
134         }
135
136         ret = w1_ds2760_read(di->w1_dev, di->raw + start, start, count);
137         if (ret != count) {
138                 dev_warn(di->dev, "call to w1_ds2760_read failed (0x%p)\n",
139                          di->w1_dev);
140                 return 1;
141         }
142
143         di->update_time = jiffies;
144
145         /* DS2760 reports voltage in units of 4.88mV, but the battery class
146          * reports in units of uV, so convert by multiplying by 4880. */
147         di->voltage_raw = (di->raw[DS2760_VOLTAGE_MSB] << 3) |
148                           (di->raw[DS2760_VOLTAGE_LSB] >> 5);
149         di->voltage_uV = di->voltage_raw * 4880;
150
151         /* DS2760 reports current in signed units of 0.625mA, but the battery
152          * class reports in units of µA, so convert by multiplying by 625. */
153         di->current_raw =
154             (((signed char)di->raw[DS2760_CURRENT_MSB]) << 5) |
155                           (di->raw[DS2760_CURRENT_LSB] >> 3);
156         di->current_uA = di->current_raw * 625;
157
158         /* DS2760 reports accumulated current in signed units of 0.25mAh. */
159         di->accum_current_raw =
160             (((signed char)di->raw[DS2760_CURRENT_ACCUM_MSB]) << 8) |
161                            di->raw[DS2760_CURRENT_ACCUM_LSB];
162         di->accum_current_uAh = di->accum_current_raw * 250;
163
164         /* DS2760 reports temperature in signed units of 0.125°C, but the
165          * battery class reports in units of 1/10 °C, so we convert by
166          * multiplying by .125 * 10 = 1.25. */
167         di->temp_raw = (((signed char)di->raw[DS2760_TEMP_MSB]) << 3) |
168                                      (di->raw[DS2760_TEMP_LSB] >> 5);
169         di->temp_C = di->temp_raw + (di->temp_raw / 4);
170
171         /* At least some battery monitors (e.g. HP iPAQ) store the battery's
172          * maximum rated capacity. */
173         if (di->raw[DS2760_RATED_CAPACITY] < ARRAY_SIZE(rated_capacities))
174                 di->rated_capacity = rated_capacities[
175                         (unsigned int)di->raw[DS2760_RATED_CAPACITY]];
176         else
177                 di->rated_capacity = di->raw[DS2760_RATED_CAPACITY] * 10;
178
179         di->rated_capacity *= 1000; /* convert to µAh */
180
181         /* Calculate the full level at the present temperature. */
182         di->full_active_uAh = di->raw[DS2760_ACTIVE_FULL] << 8 |
183                               di->raw[DS2760_ACTIVE_FULL + 1];
184
185         /* If the full_active_uAh value is not given, fall back to the rated
186          * capacity. This is likely to happen when chips are not part of the
187          * battery pack and is therefore not bootstrapped. */
188         if (di->full_active_uAh == 0)
189                 di->full_active_uAh = di->rated_capacity / 1000L;
190
191         scale[0] = di->full_active_uAh;
192         for (i = 1; i < 5; i++)
193                 scale[i] = scale[i - 1] + di->raw[DS2760_ACTIVE_FULL + 1 + i];
194
195         di->full_active_uAh = battery_interpolate(scale, di->temp_C / 10);
196         di->full_active_uAh *= 1000; /* convert to µAh */
197
198         /* Calculate the empty level at the present temperature. */
199         scale[4] = di->raw[DS2760_ACTIVE_EMPTY + 4];
200         for (i = 3; i >= 0; i--)
201                 scale[i] = scale[i + 1] + di->raw[DS2760_ACTIVE_EMPTY + i];
202
203         di->empty_uAh = battery_interpolate(scale, di->temp_C / 10);
204         di->empty_uAh *= 1000; /* convert to µAh */
205
206         if (di->full_active_uAh == di->empty_uAh)
207                 di->rem_capacity = 0;
208         else
209                 /* From Maxim Application Note 131: remaining capacity =
210                  * ((ICA - Empty Value) / (Full Value - Empty Value)) x 100% */
211                 di->rem_capacity = ((di->accum_current_uAh - di->empty_uAh) * 100L) /
212                                     (di->full_active_uAh - di->empty_uAh);
213
214         if (di->rem_capacity < 0)
215                 di->rem_capacity = 0;
216         if (di->rem_capacity > 100)
217                 di->rem_capacity = 100;
218
219         if (di->current_uA < -100L)
220                 di->life_sec = -((di->accum_current_uAh - di->empty_uAh) * 36L)
221                                         / (di->current_uA / 100L);
222         else
223                 di->life_sec = 0;
224
225         return 0;
226 }
227
228 static void ds2760_battery_set_current_accum(struct ds2760_device_info *di,
229                                              unsigned int acr_val)
230 {
231         unsigned char acr[2];
232
233         /* acr is in units of 0.25 mAh */
234         acr_val *= 4L;
235         acr_val /= 1000;
236
237         acr[0] = acr_val >> 8;
238         acr[1] = acr_val & 0xff;
239
240         if (w1_ds2760_write(di->w1_dev, acr, DS2760_CURRENT_ACCUM_MSB, 2) < 2)
241                 dev_warn(di->dev, "ACR write failed\n");
242 }
243
244 static void ds2760_battery_update_status(struct ds2760_device_info *di)
245 {
246         int old_charge_status = di->charge_status;
247
248         ds2760_battery_read_status(di);
249
250         if (di->charge_status == POWER_SUPPLY_STATUS_UNKNOWN)
251                 di->full_counter = 0;
252
253         if (power_supply_am_i_supplied(&di->bat)) {
254                 if (di->current_uA > 10000) {
255                         di->charge_status = POWER_SUPPLY_STATUS_CHARGING;
256                         di->full_counter = 0;
257                 } else if (di->current_uA < -5000) {
258                         if (di->charge_status != POWER_SUPPLY_STATUS_NOT_CHARGING)
259                                 dev_notice(di->dev, "not enough power to "
260                                            "charge\n");
261                         di->charge_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
262                         di->full_counter = 0;
263                 } else if (di->current_uA < 10000 &&
264                             di->charge_status != POWER_SUPPLY_STATUS_FULL) {
265
266                         /* Don't consider the battery to be full unless
267                          * we've seen the current < 10 mA at least two
268                          * consecutive times. */
269
270                         di->full_counter++;
271
272                         if (di->full_counter < 2) {
273                                 di->charge_status = POWER_SUPPLY_STATUS_CHARGING;
274                         } else {
275                                 di->charge_status = POWER_SUPPLY_STATUS_FULL;
276                                 ds2760_battery_set_current_accum(di,
277                                                 di->full_active_uAh);
278                         }
279                 }
280         } else {
281                 di->charge_status = POWER_SUPPLY_STATUS_DISCHARGING;
282                 di->full_counter = 0;
283         }
284
285         if (di->charge_status != old_charge_status)
286                 power_supply_changed(&di->bat);
287 }
288
289 static void ds2760_battery_write_status(struct ds2760_device_info *di,
290                                         char status)
291 {
292         if (status == di->raw[DS2760_STATUS_REG])
293                 return;
294
295         w1_ds2760_write(di->w1_dev, &status, DS2760_STATUS_WRITE_REG, 1);
296         w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);
297         w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);
298 }
299
300 static void ds2760_battery_write_rated_capacity(struct ds2760_device_info *di,
301                                                 unsigned char rated_capacity)
302 {
303         if (rated_capacity == di->raw[DS2760_RATED_CAPACITY])
304                 return;
305
306         w1_ds2760_write(di->w1_dev, &rated_capacity, DS2760_RATED_CAPACITY, 1);
307         w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);
308         w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);
309 }
310
311 static void ds2760_battery_write_active_full(struct ds2760_device_info *di,
312                                              int active_full)
313 {
314         unsigned char tmp[2] = {
315                 active_full >> 8,
316                 active_full & 0xff
317         };
318
319         if (tmp[0] == di->raw[DS2760_ACTIVE_FULL] &&
320             tmp[1] == di->raw[DS2760_ACTIVE_FULL + 1])
321                 return;
322
323         w1_ds2760_write(di->w1_dev, tmp, DS2760_ACTIVE_FULL, sizeof(tmp));
324         w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK0);
325         w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK0);
326
327         /* Write to the di->raw[] buffer directly - the DS2760_ACTIVE_FULL
328          * values won't be read back by ds2760_battery_read_status() */
329         di->raw[DS2760_ACTIVE_FULL] = tmp[0];
330         di->raw[DS2760_ACTIVE_FULL + 1] = tmp[1];
331 }
332
333 static void ds2760_battery_work(struct work_struct *work)
334 {
335         struct ds2760_device_info *di = container_of(work,
336                 struct ds2760_device_info, monitor_work.work);
337         const int interval = HZ * 60;
338
339         dev_dbg(di->dev, "%s\n", __func__);
340
341         ds2760_battery_update_status(di);
342         queue_delayed_work(di->monitor_wqueue, &di->monitor_work, interval);
343 }
344
345 #define to_ds2760_device_info(x) container_of((x), struct ds2760_device_info, \
346                                               bat);
347
348 static void ds2760_battery_external_power_changed(struct power_supply *psy)
349 {
350         struct ds2760_device_info *di = to_ds2760_device_info(psy);
351
352         dev_dbg(di->dev, "%s\n", __func__);
353
354         cancel_delayed_work(&di->monitor_work);
355         queue_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ/10);
356 }
357
358
359 static void ds2760_battery_set_charged_work(struct work_struct *work)
360 {
361         char bias;
362         struct ds2760_device_info *di = container_of(work,
363                 struct ds2760_device_info, set_charged_work.work);
364
365         dev_dbg(di->dev, "%s\n", __func__);
366
367         ds2760_battery_read_status(di);
368
369         /* When we get notified by external circuitry that the battery is
370          * considered fully charged now, we know that there is no current
371          * flow any more. However, the ds2760's internal current meter is
372          * too inaccurate to rely on - spec say something ~15% failure.
373          * Hence, we use the current offset bias register to compensate
374          * that error.
375          */
376
377         if (!power_supply_am_i_supplied(&di->bat))
378                 return;
379
380         bias = (signed char) di->current_raw +
381                 (signed char) di->raw[DS2760_CURRENT_OFFSET_BIAS];
382
383         dev_dbg(di->dev, "%s: bias = %d\n", __func__, bias);
384
385         w1_ds2760_write(di->w1_dev, &bias, DS2760_CURRENT_OFFSET_BIAS, 1);
386         w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);
387         w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);
388
389         /* Write to the di->raw[] buffer directly - the CURRENT_OFFSET_BIAS
390          * value won't be read back by ds2760_battery_read_status() */
391         di->raw[DS2760_CURRENT_OFFSET_BIAS] = bias;
392 }
393
394 static void ds2760_battery_set_charged(struct power_supply *psy)
395 {
396         struct ds2760_device_info *di = to_ds2760_device_info(psy);
397
398         /* postpone the actual work by 20 secs. This is for debouncing GPIO
399          * signals and to let the current value settle. See AN4188. */
400         cancel_delayed_work(&di->set_charged_work);
401         queue_delayed_work(di->monitor_wqueue, &di->set_charged_work, HZ * 20);
402 }
403
404 static int ds2760_battery_get_property(struct power_supply *psy,
405                                        enum power_supply_property psp,
406                                        union power_supply_propval *val)
407 {
408         struct ds2760_device_info *di = to_ds2760_device_info(psy);
409
410         switch (psp) {
411         case POWER_SUPPLY_PROP_STATUS:
412                 val->intval = di->charge_status;
413                 return 0;
414         default:
415                 break;
416         }
417
418         ds2760_battery_read_status(di);
419
420         switch (psp) {
421         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
422                 val->intval = di->voltage_uV;
423                 break;
424         case POWER_SUPPLY_PROP_CURRENT_NOW:
425                 val->intval = di->current_uA;
426                 break;
427         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
428                 val->intval = di->rated_capacity;
429                 break;
430         case POWER_SUPPLY_PROP_CHARGE_FULL:
431                 val->intval = di->full_active_uAh;
432                 break;
433         case POWER_SUPPLY_PROP_CHARGE_EMPTY:
434                 val->intval = di->empty_uAh;
435                 break;
436         case POWER_SUPPLY_PROP_CHARGE_NOW:
437                 val->intval = di->accum_current_uAh;
438                 break;
439         case POWER_SUPPLY_PROP_TEMP:
440                 val->intval = di->temp_C;
441                 break;
442         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
443                 val->intval = di->life_sec;
444                 break;
445         case POWER_SUPPLY_PROP_CAPACITY:
446                 val->intval = di->rem_capacity;
447                 break;
448         default:
449                 return -EINVAL;
450         }
451
452         return 0;
453 }
454
455 static int ds2760_battery_set_property(struct power_supply *psy,
456                                        enum power_supply_property psp,
457                                        const union power_supply_propval *val)
458 {
459         struct ds2760_device_info *di = to_ds2760_device_info(psy);
460
461         switch (psp) {
462         case POWER_SUPPLY_PROP_CHARGE_FULL:
463                 /* the interface counts in uAh, convert the value */
464                 ds2760_battery_write_active_full(di, val->intval / 1000L);
465                 break;
466
467         case POWER_SUPPLY_PROP_CHARGE_NOW:
468                 /* ds2760_battery_set_current_accum() does the conversion */
469                 ds2760_battery_set_current_accum(di, val->intval);
470                 break;
471
472         default:
473                 return -EPERM;
474         }
475
476         return 0;
477 }
478
479 static int ds2760_battery_property_is_writeable(struct power_supply *psy,
480                                                 enum power_supply_property psp)
481 {
482         switch (psp) {
483         case POWER_SUPPLY_PROP_CHARGE_FULL:
484         case POWER_SUPPLY_PROP_CHARGE_NOW:
485                 return 1;
486
487         default:
488                 break;
489         }
490
491         return 0;
492 }
493
494 static enum power_supply_property ds2760_battery_props[] = {
495         POWER_SUPPLY_PROP_STATUS,
496         POWER_SUPPLY_PROP_VOLTAGE_NOW,
497         POWER_SUPPLY_PROP_CURRENT_NOW,
498         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
499         POWER_SUPPLY_PROP_CHARGE_FULL,
500         POWER_SUPPLY_PROP_CHARGE_EMPTY,
501         POWER_SUPPLY_PROP_CHARGE_NOW,
502         POWER_SUPPLY_PROP_TEMP,
503         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
504         POWER_SUPPLY_PROP_CAPACITY,
505 };
506
507 static int ds2760_battery_probe(struct platform_device *pdev)
508 {
509         char status;
510         int retval = 0;
511         struct ds2760_device_info *di;
512
513         di = kzalloc(sizeof(*di), GFP_KERNEL);
514         if (!di) {
515                 retval = -ENOMEM;
516                 goto di_alloc_failed;
517         }
518
519         platform_set_drvdata(pdev, di);
520
521         di->dev                 = &pdev->dev;
522         di->w1_dev              = pdev->dev.parent;
523         di->bat.name            = dev_name(&pdev->dev);
524         di->bat.type            = POWER_SUPPLY_TYPE_BATTERY;
525         di->bat.properties      = ds2760_battery_props;
526         di->bat.num_properties  = ARRAY_SIZE(ds2760_battery_props);
527         di->bat.get_property    = ds2760_battery_get_property;
528         di->bat.set_property    = ds2760_battery_set_property;
529         di->bat.property_is_writeable =
530                                   ds2760_battery_property_is_writeable;
531         di->bat.set_charged     = ds2760_battery_set_charged;
532         di->bat.external_power_changed =
533                                   ds2760_battery_external_power_changed;
534
535         di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;
536
537         /* enable sleep mode feature */
538         ds2760_battery_read_status(di);
539         status = di->raw[DS2760_STATUS_REG];
540         if (pmod_enabled)
541                 status |= DS2760_STATUS_PMOD;
542         else
543                 status &= ~DS2760_STATUS_PMOD;
544
545         ds2760_battery_write_status(di, status);
546
547         /* set rated capacity from module param */
548         if (rated_capacity)
549                 ds2760_battery_write_rated_capacity(di, rated_capacity);
550
551         /* set current accumulator if given as parameter.
552          * this should only be done for bootstrapping the value */
553         if (current_accum)
554                 ds2760_battery_set_current_accum(di, current_accum);
555
556         retval = power_supply_register(&pdev->dev, &di->bat);
557         if (retval) {
558                 dev_err(di->dev, "failed to register battery\n");
559                 goto batt_failed;
560         }
561
562         INIT_DELAYED_WORK(&di->monitor_work, ds2760_battery_work);
563         INIT_DELAYED_WORK(&di->set_charged_work,
564                           ds2760_battery_set_charged_work);
565         di->monitor_wqueue = create_singlethread_workqueue(dev_name(&pdev->dev));
566         if (!di->monitor_wqueue) {
567                 retval = -ESRCH;
568                 goto workqueue_failed;
569         }
570         queue_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ * 1);
571
572         goto success;
573
574 workqueue_failed:
575         power_supply_unregister(&di->bat);
576 batt_failed:
577         kfree(di);
578 di_alloc_failed:
579 success:
580         return retval;
581 }
582
583 static int ds2760_battery_remove(struct platform_device *pdev)
584 {
585         struct ds2760_device_info *di = platform_get_drvdata(pdev);
586
587         cancel_delayed_work_sync(&di->monitor_work);
588         cancel_delayed_work_sync(&di->set_charged_work);
589         destroy_workqueue(di->monitor_wqueue);
590         power_supply_unregister(&di->bat);
591         kfree(di);
592
593         return 0;
594 }
595
596 #ifdef CONFIG_PM
597
598 static int ds2760_battery_suspend(struct platform_device *pdev,
599                                   pm_message_t state)
600 {
601         struct ds2760_device_info *di = platform_get_drvdata(pdev);
602
603         di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;
604
605         return 0;
606 }
607
608 static int ds2760_battery_resume(struct platform_device *pdev)
609 {
610         struct ds2760_device_info *di = platform_get_drvdata(pdev);
611
612         di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;
613         power_supply_changed(&di->bat);
614
615         cancel_delayed_work(&di->monitor_work);
616         queue_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ);
617
618         return 0;
619 }
620
621 #else
622
623 #define ds2760_battery_suspend NULL
624 #define ds2760_battery_resume NULL
625
626 #endif /* CONFIG_PM */
627
628 MODULE_ALIAS("platform:ds2760-battery");
629
630 static struct platform_driver ds2760_battery_driver = {
631         .driver = {
632                 .name = "ds2760-battery",
633         },
634         .probe    = ds2760_battery_probe,
635         .remove   = ds2760_battery_remove,
636         .suspend  = ds2760_battery_suspend,
637         .resume   = ds2760_battery_resume,
638 };
639
640 static int __init ds2760_battery_init(void)
641 {
642         return platform_driver_register(&ds2760_battery_driver);
643 }
644
645 static void __exit ds2760_battery_exit(void)
646 {
647         platform_driver_unregister(&ds2760_battery_driver);
648 }
649
650 module_init(ds2760_battery_init);
651 module_exit(ds2760_battery_exit);
652
653 MODULE_LICENSE("GPL");
654 MODULE_AUTHOR("Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>, "
655               "Matt Reimer <mreimer@vpop.net>, "
656               "Anton Vorontsov <cbou@mail.ru>");
657 MODULE_DESCRIPTION("ds2760 battery driver");