Merge branch 'devel' of git://git.kernel.org/pub/scm/linux/kernel/git/ycmiao/pxa...
[linux-2.6.git] / drivers / power / ds2760_battery.c
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         1440,   /* Lishen */
90         1440,   /* NEC */
91         2880,   /* Samsung */
92         2880,   /* BYD */
93         2880,   /* Lishen */
94         2880    /* NEC */
95 };
96
97 /* array is level at temps 0°C, 10°C, 20°C, 30°C, 40°C
98  * temp is in Celsius */
99 static int battery_interpolate(int array[], int temp)
100 {
101         int index, dt;
102
103         if (temp <= 0)
104                 return array[0];
105         if (temp >= 40)
106                 return array[4];
107
108         index = temp / 10;
109         dt    = temp % 10;
110
111         return array[index] + (((array[index + 1] - array[index]) * dt) / 10);
112 }
113
114 static int ds2760_battery_read_status(struct ds2760_device_info *di)
115 {
116         int ret, i, start, count, scale[5];
117
118         if (di->update_time && time_before(jiffies, di->update_time +
119                                            msecs_to_jiffies(cache_time)))
120                 return 0;
121
122         /* The first time we read the entire contents of SRAM/EEPROM,
123          * but after that we just read the interesting bits that change. */
124         if (di->update_time == 0) {
125                 start = 0;
126                 count = DS2760_DATA_SIZE;
127         } else {
128                 start = DS2760_VOLTAGE_MSB;
129                 count = DS2760_TEMP_LSB - start + 1;
130         }
131
132         ret = w1_ds2760_read(di->w1_dev, di->raw + start, start, count);
133         if (ret != count) {
134                 dev_warn(di->dev, "call to w1_ds2760_read failed (0x%p)\n",
135                          di->w1_dev);
136                 return 1;
137         }
138
139         di->update_time = jiffies;
140
141         /* DS2760 reports voltage in units of 4.88mV, but the battery class
142          * reports in units of uV, so convert by multiplying by 4880. */
143         di->voltage_raw = (di->raw[DS2760_VOLTAGE_MSB] << 3) |
144                           (di->raw[DS2760_VOLTAGE_LSB] >> 5);
145         di->voltage_uV = di->voltage_raw * 4880;
146
147         /* DS2760 reports current in signed units of 0.625mA, but the battery
148          * class reports in units of µA, so convert by multiplying by 625. */
149         di->current_raw =
150             (((signed char)di->raw[DS2760_CURRENT_MSB]) << 5) |
151                           (di->raw[DS2760_CURRENT_LSB] >> 3);
152         di->current_uA = di->current_raw * 625;
153
154         /* DS2760 reports accumulated current in signed units of 0.25mAh. */
155         di->accum_current_raw =
156             (((signed char)di->raw[DS2760_CURRENT_ACCUM_MSB]) << 8) |
157                            di->raw[DS2760_CURRENT_ACCUM_LSB];
158         di->accum_current_uAh = di->accum_current_raw * 250;
159
160         /* DS2760 reports temperature in signed units of 0.125°C, but the
161          * battery class reports in units of 1/10 °C, so we convert by
162          * multiplying by .125 * 10 = 1.25. */
163         di->temp_raw = (((signed char)di->raw[DS2760_TEMP_MSB]) << 3) |
164                                      (di->raw[DS2760_TEMP_LSB] >> 5);
165         di->temp_C = di->temp_raw + (di->temp_raw / 4);
166
167         /* At least some battery monitors (e.g. HP iPAQ) store the battery's
168          * maximum rated capacity. */
169         if (di->raw[DS2760_RATED_CAPACITY] < ARRAY_SIZE(rated_capacities))
170                 di->rated_capacity = rated_capacities[
171                         (unsigned int)di->raw[DS2760_RATED_CAPACITY]];
172         else
173                 di->rated_capacity = di->raw[DS2760_RATED_CAPACITY] * 10;
174
175         di->rated_capacity *= 1000; /* convert to µAh */
176
177         /* Calculate the full level at the present temperature. */
178         di->full_active_uAh = di->raw[DS2760_ACTIVE_FULL] << 8 |
179                               di->raw[DS2760_ACTIVE_FULL + 1];
180
181         /* If the full_active_uAh value is not given, fall back to the rated
182          * capacity. This is likely to happen when chips are not part of the
183          * battery pack and is therefore not bootstrapped. */
184         if (di->full_active_uAh == 0)
185                 di->full_active_uAh = di->rated_capacity / 1000L;
186
187         scale[0] = di->full_active_uAh;
188         for (i = 1; i < 5; i++)
189                 scale[i] = scale[i - 1] + di->raw[DS2760_ACTIVE_FULL + 2 + i];
190
191         di->full_active_uAh = battery_interpolate(scale, di->temp_C / 10);
192         di->full_active_uAh *= 1000; /* convert to µAh */
193
194         /* Calculate the empty level at the present temperature. */
195         scale[4] = di->raw[DS2760_ACTIVE_EMPTY + 4];
196         for (i = 3; i >= 0; i--)
197                 scale[i] = scale[i + 1] + di->raw[DS2760_ACTIVE_EMPTY + i];
198
199         di->empty_uAh = battery_interpolate(scale, di->temp_C / 10);
200         di->empty_uAh *= 1000; /* convert to µAh */
201
202         if (di->full_active_uAh == di->empty_uAh)
203                 di->rem_capacity = 0;
204         else
205                 /* From Maxim Application Note 131: remaining capacity =
206                  * ((ICA - Empty Value) / (Full Value - Empty Value)) x 100% */
207                 di->rem_capacity = ((di->accum_current_uAh - di->empty_uAh) * 100L) /
208                                     (di->full_active_uAh - di->empty_uAh);
209
210         if (di->rem_capacity < 0)
211                 di->rem_capacity = 0;
212         if (di->rem_capacity > 100)
213                 di->rem_capacity = 100;
214
215         if (di->current_uA >= 100L)
216                 di->life_sec = -((di->accum_current_uAh - di->empty_uAh) * 36L)
217                                         / (di->current_uA / 100L);
218         else
219                 di->life_sec = 0;
220
221         return 0;
222 }
223
224 static void ds2760_battery_set_current_accum(struct ds2760_device_info *di,
225                                              unsigned int acr_val)
226 {
227         unsigned char acr[2];
228
229         /* acr is in units of 0.25 mAh */
230         acr_val *= 4L;
231         acr_val /= 1000;
232
233         acr[0] = acr_val >> 8;
234         acr[1] = acr_val & 0xff;
235
236         if (w1_ds2760_write(di->w1_dev, acr, DS2760_CURRENT_ACCUM_MSB, 2) < 2)
237                 dev_warn(di->dev, "ACR write failed\n");
238 }
239
240 static void ds2760_battery_update_status(struct ds2760_device_info *di)
241 {
242         int old_charge_status = di->charge_status;
243
244         ds2760_battery_read_status(di);
245
246         if (di->charge_status == POWER_SUPPLY_STATUS_UNKNOWN)
247                 di->full_counter = 0;
248
249         if (power_supply_am_i_supplied(&di->bat)) {
250                 if (di->current_uA > 10000) {
251                         di->charge_status = POWER_SUPPLY_STATUS_CHARGING;
252                         di->full_counter = 0;
253                 } else if (di->current_uA < -5000) {
254                         if (di->charge_status != POWER_SUPPLY_STATUS_NOT_CHARGING)
255                                 dev_notice(di->dev, "not enough power to "
256                                            "charge\n");
257                         di->charge_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
258                         di->full_counter = 0;
259                 } else if (di->current_uA < 10000 &&
260                             di->charge_status != POWER_SUPPLY_STATUS_FULL) {
261
262                         /* Don't consider the battery to be full unless
263                          * we've seen the current < 10 mA at least two
264                          * consecutive times. */
265
266                         di->full_counter++;
267
268                         if (di->full_counter < 2) {
269                                 di->charge_status = POWER_SUPPLY_STATUS_CHARGING;
270                         } else {
271                                 di->charge_status = POWER_SUPPLY_STATUS_FULL;
272                                 ds2760_battery_set_current_accum(di,
273                                                 di->full_active_uAh);
274                         }
275                 }
276         } else {
277                 di->charge_status = POWER_SUPPLY_STATUS_DISCHARGING;
278                 di->full_counter = 0;
279         }
280
281         if (di->charge_status != old_charge_status)
282                 power_supply_changed(&di->bat);
283 }
284
285 static void ds2760_battery_write_status(struct ds2760_device_info *di,
286                                         char status)
287 {
288         if (status == di->raw[DS2760_STATUS_REG])
289                 return;
290
291         w1_ds2760_write(di->w1_dev, &status, DS2760_STATUS_WRITE_REG, 1);
292         w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);
293         w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);
294 }
295
296 static void ds2760_battery_write_rated_capacity(struct ds2760_device_info *di,
297                                                 unsigned char rated_capacity)
298 {
299         if (rated_capacity == di->raw[DS2760_RATED_CAPACITY])
300                 return;
301
302         w1_ds2760_write(di->w1_dev, &rated_capacity, DS2760_RATED_CAPACITY, 1);
303         w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);
304         w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);
305 }
306
307 static void ds2760_battery_write_active_full(struct ds2760_device_info *di,
308                                              int active_full)
309 {
310         unsigned char tmp[2] = {
311                 active_full >> 8,
312                 active_full & 0xff
313         };
314
315         if (tmp[0] == di->raw[DS2760_ACTIVE_FULL] &&
316             tmp[1] == di->raw[DS2760_ACTIVE_FULL + 1])
317                 return;
318
319         w1_ds2760_write(di->w1_dev, tmp, DS2760_ACTIVE_FULL, sizeof(tmp));
320         w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK0);
321         w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK0);
322
323         /* Write to the di->raw[] buffer directly - the DS2760_ACTIVE_FULL
324          * values won't be read back by ds2760_battery_read_status() */
325         di->raw[DS2760_ACTIVE_FULL] = tmp[0];
326         di->raw[DS2760_ACTIVE_FULL + 1] = tmp[1];
327 }
328
329 static void ds2760_battery_work(struct work_struct *work)
330 {
331         struct ds2760_device_info *di = container_of(work,
332                 struct ds2760_device_info, monitor_work.work);
333         const int interval = HZ * 60;
334
335         dev_dbg(di->dev, "%s\n", __func__);
336
337         ds2760_battery_update_status(di);
338         queue_delayed_work(di->monitor_wqueue, &di->monitor_work, interval);
339 }
340
341 #define to_ds2760_device_info(x) container_of((x), struct ds2760_device_info, \
342                                               bat);
343
344 static void ds2760_battery_external_power_changed(struct power_supply *psy)
345 {
346         struct ds2760_device_info *di = to_ds2760_device_info(psy);
347
348         dev_dbg(di->dev, "%s\n", __func__);
349
350         cancel_delayed_work(&di->monitor_work);
351         queue_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ/10);
352 }
353
354
355 static void ds2760_battery_set_charged_work(struct work_struct *work)
356 {
357         char bias;
358         struct ds2760_device_info *di = container_of(work,
359                 struct ds2760_device_info, set_charged_work.work);
360
361         dev_dbg(di->dev, "%s\n", __func__);
362
363         ds2760_battery_read_status(di);
364
365         /* When we get notified by external circuitry that the battery is
366          * considered fully charged now, we know that there is no current
367          * flow any more. However, the ds2760's internal current meter is
368          * too inaccurate to rely on - spec say something ~15% failure.
369          * Hence, we use the current offset bias register to compensate
370          * that error.
371          */
372
373         if (!power_supply_am_i_supplied(&di->bat))
374                 return;
375
376         bias = (signed char) di->current_raw +
377                 (signed char) di->raw[DS2760_CURRENT_OFFSET_BIAS];
378
379         dev_dbg(di->dev, "%s: bias = %d\n", __func__, bias);
380
381         w1_ds2760_write(di->w1_dev, &bias, DS2760_CURRENT_OFFSET_BIAS, 1);
382         w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);
383         w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);
384
385         /* Write to the di->raw[] buffer directly - the CURRENT_OFFSET_BIAS
386          * value won't be read back by ds2760_battery_read_status() */
387         di->raw[DS2760_CURRENT_OFFSET_BIAS] = bias;
388 }
389
390 static void ds2760_battery_set_charged(struct power_supply *psy)
391 {
392         struct ds2760_device_info *di = to_ds2760_device_info(psy);
393
394         /* postpone the actual work by 20 secs. This is for debouncing GPIO
395          * signals and to let the current value settle. See AN4188. */
396         cancel_delayed_work(&di->set_charged_work);
397         queue_delayed_work(di->monitor_wqueue, &di->set_charged_work, HZ * 20);
398 }
399
400 static int ds2760_battery_get_property(struct power_supply *psy,
401                                        enum power_supply_property psp,
402                                        union power_supply_propval *val)
403 {
404         struct ds2760_device_info *di = to_ds2760_device_info(psy);
405
406         switch (psp) {
407         case POWER_SUPPLY_PROP_STATUS:
408                 val->intval = di->charge_status;
409                 return 0;
410         default:
411                 break;
412         }
413
414         ds2760_battery_read_status(di);
415
416         switch (psp) {
417         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
418                 val->intval = di->voltage_uV;
419                 break;
420         case POWER_SUPPLY_PROP_CURRENT_NOW:
421                 val->intval = di->current_uA;
422                 break;
423         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
424                 val->intval = di->rated_capacity;
425                 break;
426         case POWER_SUPPLY_PROP_CHARGE_FULL:
427                 val->intval = di->full_active_uAh;
428                 break;
429         case POWER_SUPPLY_PROP_CHARGE_EMPTY:
430                 val->intval = di->empty_uAh;
431                 break;
432         case POWER_SUPPLY_PROP_CHARGE_NOW:
433                 val->intval = di->accum_current_uAh;
434                 break;
435         case POWER_SUPPLY_PROP_TEMP:
436                 val->intval = di->temp_C;
437                 break;
438         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
439                 val->intval = di->life_sec;
440                 break;
441         case POWER_SUPPLY_PROP_CAPACITY:
442                 val->intval = di->rem_capacity;
443                 break;
444         default:
445                 return -EINVAL;
446         }
447
448         return 0;
449 }
450
451 static int ds2760_battery_set_property(struct power_supply *psy,
452                                        enum power_supply_property psp,
453                                        const union power_supply_propval *val)
454 {
455         struct ds2760_device_info *di = to_ds2760_device_info(psy);
456
457         switch (psp) {
458         case POWER_SUPPLY_PROP_CHARGE_FULL:
459                 /* the interface counts in uAh, convert the value */
460                 ds2760_battery_write_active_full(di, val->intval / 1000L);
461                 break;
462
463         case POWER_SUPPLY_PROP_CHARGE_NOW:
464                 /* ds2760_battery_set_current_accum() does the conversion */
465                 ds2760_battery_set_current_accum(di, val->intval);
466                 break;
467
468         default:
469                 return -EPERM;
470         }
471
472         return 0;
473 }
474
475 static int ds2760_battery_property_is_writeable(struct power_supply *psy,
476                                                 enum power_supply_property psp)
477 {
478         switch (psp) {
479         case POWER_SUPPLY_PROP_CHARGE_FULL:
480         case POWER_SUPPLY_PROP_CHARGE_NOW:
481                 return 1;
482
483         default:
484                 break;
485         }
486
487         return 0;
488 }
489
490 static enum power_supply_property ds2760_battery_props[] = {
491         POWER_SUPPLY_PROP_STATUS,
492         POWER_SUPPLY_PROP_VOLTAGE_NOW,
493         POWER_SUPPLY_PROP_CURRENT_NOW,
494         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
495         POWER_SUPPLY_PROP_CHARGE_FULL,
496         POWER_SUPPLY_PROP_CHARGE_EMPTY,
497         POWER_SUPPLY_PROP_CHARGE_NOW,
498         POWER_SUPPLY_PROP_TEMP,
499         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
500         POWER_SUPPLY_PROP_CAPACITY,
501 };
502
503 static int ds2760_battery_probe(struct platform_device *pdev)
504 {
505         char status;
506         int retval = 0;
507         struct ds2760_device_info *di;
508
509         di = kzalloc(sizeof(*di), GFP_KERNEL);
510         if (!di) {
511                 retval = -ENOMEM;
512                 goto di_alloc_failed;
513         }
514
515         platform_set_drvdata(pdev, di);
516
517         di->dev                 = &pdev->dev;
518         di->w1_dev              = pdev->dev.parent;
519         di->bat.name            = dev_name(&pdev->dev);
520         di->bat.type            = POWER_SUPPLY_TYPE_BATTERY;
521         di->bat.properties      = ds2760_battery_props;
522         di->bat.num_properties  = ARRAY_SIZE(ds2760_battery_props);
523         di->bat.get_property    = ds2760_battery_get_property;
524         di->bat.set_property    = ds2760_battery_set_property;
525         di->bat.property_is_writeable =
526                                   ds2760_battery_property_is_writeable;
527         di->bat.set_charged     = ds2760_battery_set_charged;
528         di->bat.external_power_changed =
529                                   ds2760_battery_external_power_changed;
530
531         di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;
532
533         /* enable sleep mode feature */
534         ds2760_battery_read_status(di);
535         status = di->raw[DS2760_STATUS_REG];
536         if (pmod_enabled)
537                 status |= DS2760_STATUS_PMOD;
538         else
539                 status &= ~DS2760_STATUS_PMOD;
540
541         ds2760_battery_write_status(di, status);
542
543         /* set rated capacity from module param */
544         if (rated_capacity)
545                 ds2760_battery_write_rated_capacity(di, rated_capacity);
546
547         /* set current accumulator if given as parameter.
548          * this should only be done for bootstrapping the value */
549         if (current_accum)
550                 ds2760_battery_set_current_accum(di, current_accum);
551
552         retval = power_supply_register(&pdev->dev, &di->bat);
553         if (retval) {
554                 dev_err(di->dev, "failed to register battery\n");
555                 goto batt_failed;
556         }
557
558         INIT_DELAYED_WORK(&di->monitor_work, ds2760_battery_work);
559         INIT_DELAYED_WORK(&di->set_charged_work,
560                           ds2760_battery_set_charged_work);
561         di->monitor_wqueue = create_singlethread_workqueue(dev_name(&pdev->dev));
562         if (!di->monitor_wqueue) {
563                 retval = -ESRCH;
564                 goto workqueue_failed;
565         }
566         queue_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ * 1);
567
568         goto success;
569
570 workqueue_failed:
571         power_supply_unregister(&di->bat);
572 batt_failed:
573         kfree(di);
574 di_alloc_failed:
575 success:
576         return retval;
577 }
578
579 static int ds2760_battery_remove(struct platform_device *pdev)
580 {
581         struct ds2760_device_info *di = platform_get_drvdata(pdev);
582
583         cancel_rearming_delayed_workqueue(di->monitor_wqueue,
584                                           &di->monitor_work);
585         cancel_rearming_delayed_workqueue(di->monitor_wqueue,
586                                           &di->set_charged_work);
587         destroy_workqueue(di->monitor_wqueue);
588         power_supply_unregister(&di->bat);
589
590         return 0;
591 }
592
593 #ifdef CONFIG_PM
594
595 static int ds2760_battery_suspend(struct platform_device *pdev,
596                                   pm_message_t state)
597 {
598         struct ds2760_device_info *di = platform_get_drvdata(pdev);
599
600         di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;
601
602         return 0;
603 }
604
605 static int ds2760_battery_resume(struct platform_device *pdev)
606 {
607         struct ds2760_device_info *di = platform_get_drvdata(pdev);
608
609         di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;
610         power_supply_changed(&di->bat);
611
612         cancel_delayed_work(&di->monitor_work);
613         queue_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ);
614
615         return 0;
616 }
617
618 #else
619
620 #define ds2760_battery_suspend NULL
621 #define ds2760_battery_resume NULL
622
623 #endif /* CONFIG_PM */
624
625 MODULE_ALIAS("platform:ds2760-battery");
626
627 static struct platform_driver ds2760_battery_driver = {
628         .driver = {
629                 .name = "ds2760-battery",
630         },
631         .probe    = ds2760_battery_probe,
632         .remove   = ds2760_battery_remove,
633         .suspend  = ds2760_battery_suspend,
634         .resume   = ds2760_battery_resume,
635 };
636
637 static int __init ds2760_battery_init(void)
638 {
639         return platform_driver_register(&ds2760_battery_driver);
640 }
641
642 static void __exit ds2760_battery_exit(void)
643 {
644         platform_driver_unregister(&ds2760_battery_driver);
645 }
646
647 module_init(ds2760_battery_init);
648 module_exit(ds2760_battery_exit);
649
650 MODULE_LICENSE("GPL");
651 MODULE_AUTHOR("Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>, "
652               "Matt Reimer <mreimer@vpop.net>, "
653               "Anton Vorontsov <cbou@mail.ru>");
654 MODULE_DESCRIPTION("ds2760 battery driver");