drm/i915: SDVO hotplug have different interrupt status bits for i915/i965/g4x
[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 bool 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 #ifdef CONFIG_MACH_H4700
100         0,
101         3600,   /* HP iPAQ hx4700 3.7V 3600mAh (359114-001) */
102 #endif
103 };
104
105 /* array is level at temps 0°C, 10°C, 20°C, 30°C, 40°C
106  * temp is in Celsius */
107 static int battery_interpolate(int array[], int temp)
108 {
109         int index, dt;
110
111         if (temp <= 0)
112                 return array[0];
113         if (temp >= 40)
114                 return array[4];
115
116         index = temp / 10;
117         dt    = temp % 10;
118
119         return array[index] + (((array[index + 1] - array[index]) * dt) / 10);
120 }
121
122 static int ds2760_battery_read_status(struct ds2760_device_info *di)
123 {
124         int ret, i, start, count, scale[5];
125
126         if (di->update_time && time_before(jiffies, di->update_time +
127                                            msecs_to_jiffies(cache_time)))
128                 return 0;
129
130         /* The first time we read the entire contents of SRAM/EEPROM,
131          * but after that we just read the interesting bits that change. */
132         if (di->update_time == 0) {
133                 start = 0;
134                 count = DS2760_DATA_SIZE;
135         } else {
136                 start = DS2760_VOLTAGE_MSB;
137                 count = DS2760_TEMP_LSB - start + 1;
138         }
139
140         ret = w1_ds2760_read(di->w1_dev, di->raw + start, start, count);
141         if (ret != count) {
142                 dev_warn(di->dev, "call to w1_ds2760_read failed (0x%p)\n",
143                          di->w1_dev);
144                 return 1;
145         }
146
147         di->update_time = jiffies;
148
149         /* DS2760 reports voltage in units of 4.88mV, but the battery class
150          * reports in units of uV, so convert by multiplying by 4880. */
151         di->voltage_raw = (di->raw[DS2760_VOLTAGE_MSB] << 3) |
152                           (di->raw[DS2760_VOLTAGE_LSB] >> 5);
153         di->voltage_uV = di->voltage_raw * 4880;
154
155         /* DS2760 reports current in signed units of 0.625mA, but the battery
156          * class reports in units of µA, so convert by multiplying by 625. */
157         di->current_raw =
158             (((signed char)di->raw[DS2760_CURRENT_MSB]) << 5) |
159                           (di->raw[DS2760_CURRENT_LSB] >> 3);
160         di->current_uA = di->current_raw * 625;
161
162         /* DS2760 reports accumulated current in signed units of 0.25mAh. */
163         di->accum_current_raw =
164             (((signed char)di->raw[DS2760_CURRENT_ACCUM_MSB]) << 8) |
165                            di->raw[DS2760_CURRENT_ACCUM_LSB];
166         di->accum_current_uAh = di->accum_current_raw * 250;
167
168         /* DS2760 reports temperature in signed units of 0.125°C, but the
169          * battery class reports in units of 1/10 °C, so we convert by
170          * multiplying by .125 * 10 = 1.25. */
171         di->temp_raw = (((signed char)di->raw[DS2760_TEMP_MSB]) << 3) |
172                                      (di->raw[DS2760_TEMP_LSB] >> 5);
173         di->temp_C = di->temp_raw + (di->temp_raw / 4);
174
175         /* At least some battery monitors (e.g. HP iPAQ) store the battery's
176          * maximum rated capacity. */
177         if (di->raw[DS2760_RATED_CAPACITY] < ARRAY_SIZE(rated_capacities))
178                 di->rated_capacity = rated_capacities[
179                         (unsigned int)di->raw[DS2760_RATED_CAPACITY]];
180         else
181                 di->rated_capacity = di->raw[DS2760_RATED_CAPACITY] * 10;
182
183         di->rated_capacity *= 1000; /* convert to µAh */
184
185         /* Calculate the full level at the present temperature. */
186         di->full_active_uAh = di->raw[DS2760_ACTIVE_FULL] << 8 |
187                               di->raw[DS2760_ACTIVE_FULL + 1];
188
189         /* If the full_active_uAh value is not given, fall back to the rated
190          * capacity. This is likely to happen when chips are not part of the
191          * battery pack and is therefore not bootstrapped. */
192         if (di->full_active_uAh == 0)
193                 di->full_active_uAh = di->rated_capacity / 1000L;
194
195         scale[0] = di->full_active_uAh;
196         for (i = 1; i < 5; i++)
197                 scale[i] = scale[i - 1] + di->raw[DS2760_ACTIVE_FULL + 1 + i];
198
199         di->full_active_uAh = battery_interpolate(scale, di->temp_C / 10);
200         di->full_active_uAh *= 1000; /* convert to µAh */
201
202         /* Calculate the empty level at the present temperature. */
203         scale[4] = di->raw[DS2760_ACTIVE_EMPTY + 4];
204         for (i = 3; i >= 0; i--)
205                 scale[i] = scale[i + 1] + di->raw[DS2760_ACTIVE_EMPTY + i];
206
207         di->empty_uAh = battery_interpolate(scale, di->temp_C / 10);
208         di->empty_uAh *= 1000; /* convert to µAh */
209
210         if (di->full_active_uAh == di->empty_uAh)
211                 di->rem_capacity = 0;
212         else
213                 /* From Maxim Application Note 131: remaining capacity =
214                  * ((ICA - Empty Value) / (Full Value - Empty Value)) x 100% */
215                 di->rem_capacity = ((di->accum_current_uAh - di->empty_uAh) * 100L) /
216                                     (di->full_active_uAh - di->empty_uAh);
217
218         if (di->rem_capacity < 0)
219                 di->rem_capacity = 0;
220         if (di->rem_capacity > 100)
221                 di->rem_capacity = 100;
222
223         if (di->current_uA < -100L)
224                 di->life_sec = -((di->accum_current_uAh - di->empty_uAh) * 36L)
225                                         / (di->current_uA / 100L);
226         else
227                 di->life_sec = 0;
228
229         return 0;
230 }
231
232 static void ds2760_battery_set_current_accum(struct ds2760_device_info *di,
233                                              unsigned int acr_val)
234 {
235         unsigned char acr[2];
236
237         /* acr is in units of 0.25 mAh */
238         acr_val *= 4L;
239         acr_val /= 1000;
240
241         acr[0] = acr_val >> 8;
242         acr[1] = acr_val & 0xff;
243
244         if (w1_ds2760_write(di->w1_dev, acr, DS2760_CURRENT_ACCUM_MSB, 2) < 2)
245                 dev_warn(di->dev, "ACR write failed\n");
246 }
247
248 static void ds2760_battery_update_status(struct ds2760_device_info *di)
249 {
250         int old_charge_status = di->charge_status;
251
252         ds2760_battery_read_status(di);
253
254         if (di->charge_status == POWER_SUPPLY_STATUS_UNKNOWN)
255                 di->full_counter = 0;
256
257         if (power_supply_am_i_supplied(&di->bat)) {
258                 if (di->current_uA > 10000) {
259                         di->charge_status = POWER_SUPPLY_STATUS_CHARGING;
260                         di->full_counter = 0;
261                 } else if (di->current_uA < -5000) {
262                         if (di->charge_status != POWER_SUPPLY_STATUS_NOT_CHARGING)
263                                 dev_notice(di->dev, "not enough power to "
264                                            "charge\n");
265                         di->charge_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
266                         di->full_counter = 0;
267                 } else if (di->current_uA < 10000 &&
268                             di->charge_status != POWER_SUPPLY_STATUS_FULL) {
269
270                         /* Don't consider the battery to be full unless
271                          * we've seen the current < 10 mA at least two
272                          * consecutive times. */
273
274                         di->full_counter++;
275
276                         if (di->full_counter < 2) {
277                                 di->charge_status = POWER_SUPPLY_STATUS_CHARGING;
278                         } else {
279                                 di->charge_status = POWER_SUPPLY_STATUS_FULL;
280                                 ds2760_battery_set_current_accum(di,
281                                                 di->full_active_uAh);
282                         }
283                 }
284         } else {
285                 di->charge_status = POWER_SUPPLY_STATUS_DISCHARGING;
286                 di->full_counter = 0;
287         }
288
289         if (di->charge_status != old_charge_status)
290                 power_supply_changed(&di->bat);
291 }
292
293 static void ds2760_battery_write_status(struct ds2760_device_info *di,
294                                         char status)
295 {
296         if (status == di->raw[DS2760_STATUS_REG])
297                 return;
298
299         w1_ds2760_write(di->w1_dev, &status, DS2760_STATUS_WRITE_REG, 1);
300         w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);
301         w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);
302 }
303
304 static void ds2760_battery_write_rated_capacity(struct ds2760_device_info *di,
305                                                 unsigned char rated_capacity)
306 {
307         if (rated_capacity == di->raw[DS2760_RATED_CAPACITY])
308                 return;
309
310         w1_ds2760_write(di->w1_dev, &rated_capacity, DS2760_RATED_CAPACITY, 1);
311         w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);
312         w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);
313 }
314
315 static void ds2760_battery_write_active_full(struct ds2760_device_info *di,
316                                              int active_full)
317 {
318         unsigned char tmp[2] = {
319                 active_full >> 8,
320                 active_full & 0xff
321         };
322
323         if (tmp[0] == di->raw[DS2760_ACTIVE_FULL] &&
324             tmp[1] == di->raw[DS2760_ACTIVE_FULL + 1])
325                 return;
326
327         w1_ds2760_write(di->w1_dev, tmp, DS2760_ACTIVE_FULL, sizeof(tmp));
328         w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK0);
329         w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK0);
330
331         /* Write to the di->raw[] buffer directly - the DS2760_ACTIVE_FULL
332          * values won't be read back by ds2760_battery_read_status() */
333         di->raw[DS2760_ACTIVE_FULL] = tmp[0];
334         di->raw[DS2760_ACTIVE_FULL + 1] = tmp[1];
335 }
336
337 static void ds2760_battery_work(struct work_struct *work)
338 {
339         struct ds2760_device_info *di = container_of(work,
340                 struct ds2760_device_info, monitor_work.work);
341         const int interval = HZ * 60;
342
343         dev_dbg(di->dev, "%s\n", __func__);
344
345         ds2760_battery_update_status(di);
346         queue_delayed_work(di->monitor_wqueue, &di->monitor_work, interval);
347 }
348
349 #define to_ds2760_device_info(x) container_of((x), struct ds2760_device_info, \
350                                               bat);
351
352 static void ds2760_battery_external_power_changed(struct power_supply *psy)
353 {
354         struct ds2760_device_info *di = to_ds2760_device_info(psy);
355
356         dev_dbg(di->dev, "%s\n", __func__);
357
358         cancel_delayed_work(&di->monitor_work);
359         queue_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ/10);
360 }
361
362
363 static void ds2760_battery_set_charged_work(struct work_struct *work)
364 {
365         char bias;
366         struct ds2760_device_info *di = container_of(work,
367                 struct ds2760_device_info, set_charged_work.work);
368
369         dev_dbg(di->dev, "%s\n", __func__);
370
371         ds2760_battery_read_status(di);
372
373         /* When we get notified by external circuitry that the battery is
374          * considered fully charged now, we know that there is no current
375          * flow any more. However, the ds2760's internal current meter is
376          * too inaccurate to rely on - spec say something ~15% failure.
377          * Hence, we use the current offset bias register to compensate
378          * that error.
379          */
380
381         if (!power_supply_am_i_supplied(&di->bat))
382                 return;
383
384         bias = (signed char) di->current_raw +
385                 (signed char) di->raw[DS2760_CURRENT_OFFSET_BIAS];
386
387         dev_dbg(di->dev, "%s: bias = %d\n", __func__, bias);
388
389         w1_ds2760_write(di->w1_dev, &bias, DS2760_CURRENT_OFFSET_BIAS, 1);
390         w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);
391         w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);
392
393         /* Write to the di->raw[] buffer directly - the CURRENT_OFFSET_BIAS
394          * value won't be read back by ds2760_battery_read_status() */
395         di->raw[DS2760_CURRENT_OFFSET_BIAS] = bias;
396 }
397
398 static void ds2760_battery_set_charged(struct power_supply *psy)
399 {
400         struct ds2760_device_info *di = to_ds2760_device_info(psy);
401
402         /* postpone the actual work by 20 secs. This is for debouncing GPIO
403          * signals and to let the current value settle. See AN4188. */
404         cancel_delayed_work(&di->set_charged_work);
405         queue_delayed_work(di->monitor_wqueue, &di->set_charged_work, HZ * 20);
406 }
407
408 static int ds2760_battery_get_property(struct power_supply *psy,
409                                        enum power_supply_property psp,
410                                        union power_supply_propval *val)
411 {
412         struct ds2760_device_info *di = to_ds2760_device_info(psy);
413
414         switch (psp) {
415         case POWER_SUPPLY_PROP_STATUS:
416                 val->intval = di->charge_status;
417                 return 0;
418         default:
419                 break;
420         }
421
422         ds2760_battery_read_status(di);
423
424         switch (psp) {
425         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
426                 val->intval = di->voltage_uV;
427                 break;
428         case POWER_SUPPLY_PROP_CURRENT_NOW:
429                 val->intval = di->current_uA;
430                 break;
431         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
432                 val->intval = di->rated_capacity;
433                 break;
434         case POWER_SUPPLY_PROP_CHARGE_FULL:
435                 val->intval = di->full_active_uAh;
436                 break;
437         case POWER_SUPPLY_PROP_CHARGE_EMPTY:
438                 val->intval = di->empty_uAh;
439                 break;
440         case POWER_SUPPLY_PROP_CHARGE_NOW:
441                 val->intval = di->accum_current_uAh;
442                 break;
443         case POWER_SUPPLY_PROP_TEMP:
444                 val->intval = di->temp_C;
445                 break;
446         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
447                 val->intval = di->life_sec;
448                 break;
449         case POWER_SUPPLY_PROP_CAPACITY:
450                 val->intval = di->rem_capacity;
451                 break;
452         default:
453                 return -EINVAL;
454         }
455
456         return 0;
457 }
458
459 static int ds2760_battery_set_property(struct power_supply *psy,
460                                        enum power_supply_property psp,
461                                        const union power_supply_propval *val)
462 {
463         struct ds2760_device_info *di = to_ds2760_device_info(psy);
464
465         switch (psp) {
466         case POWER_SUPPLY_PROP_CHARGE_FULL:
467                 /* the interface counts in uAh, convert the value */
468                 ds2760_battery_write_active_full(di, val->intval / 1000L);
469                 break;
470
471         case POWER_SUPPLY_PROP_CHARGE_NOW:
472                 /* ds2760_battery_set_current_accum() does the conversion */
473                 ds2760_battery_set_current_accum(di, val->intval);
474                 break;
475
476         default:
477                 return -EPERM;
478         }
479
480         return 0;
481 }
482
483 static int ds2760_battery_property_is_writeable(struct power_supply *psy,
484                                                 enum power_supply_property psp)
485 {
486         switch (psp) {
487         case POWER_SUPPLY_PROP_CHARGE_FULL:
488         case POWER_SUPPLY_PROP_CHARGE_NOW:
489                 return 1;
490
491         default:
492                 break;
493         }
494
495         return 0;
496 }
497
498 static enum power_supply_property ds2760_battery_props[] = {
499         POWER_SUPPLY_PROP_STATUS,
500         POWER_SUPPLY_PROP_VOLTAGE_NOW,
501         POWER_SUPPLY_PROP_CURRENT_NOW,
502         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
503         POWER_SUPPLY_PROP_CHARGE_FULL,
504         POWER_SUPPLY_PROP_CHARGE_EMPTY,
505         POWER_SUPPLY_PROP_CHARGE_NOW,
506         POWER_SUPPLY_PROP_TEMP,
507         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
508         POWER_SUPPLY_PROP_CAPACITY,
509 };
510
511 static int ds2760_battery_probe(struct platform_device *pdev)
512 {
513         char status;
514         int retval = 0;
515         struct ds2760_device_info *di;
516
517         di = kzalloc(sizeof(*di), GFP_KERNEL);
518         if (!di) {
519                 retval = -ENOMEM;
520                 goto di_alloc_failed;
521         }
522
523         platform_set_drvdata(pdev, di);
524
525         di->dev                 = &pdev->dev;
526         di->w1_dev              = pdev->dev.parent;
527         di->bat.name            = dev_name(&pdev->dev);
528         di->bat.type            = POWER_SUPPLY_TYPE_BATTERY;
529         di->bat.properties      = ds2760_battery_props;
530         di->bat.num_properties  = ARRAY_SIZE(ds2760_battery_props);
531         di->bat.get_property    = ds2760_battery_get_property;
532         di->bat.set_property    = ds2760_battery_set_property;
533         di->bat.property_is_writeable =
534                                   ds2760_battery_property_is_writeable;
535         di->bat.set_charged     = ds2760_battery_set_charged;
536         di->bat.external_power_changed =
537                                   ds2760_battery_external_power_changed;
538
539         di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;
540
541         /* enable sleep mode feature */
542         ds2760_battery_read_status(di);
543         status = di->raw[DS2760_STATUS_REG];
544         if (pmod_enabled)
545                 status |= DS2760_STATUS_PMOD;
546         else
547                 status &= ~DS2760_STATUS_PMOD;
548
549         ds2760_battery_write_status(di, status);
550
551         /* set rated capacity from module param */
552         if (rated_capacity)
553                 ds2760_battery_write_rated_capacity(di, rated_capacity);
554
555         /* set current accumulator if given as parameter.
556          * this should only be done for bootstrapping the value */
557         if (current_accum)
558                 ds2760_battery_set_current_accum(di, current_accum);
559
560         retval = power_supply_register(&pdev->dev, &di->bat);
561         if (retval) {
562                 dev_err(di->dev, "failed to register battery\n");
563                 goto batt_failed;
564         }
565
566         INIT_DELAYED_WORK(&di->monitor_work, ds2760_battery_work);
567         INIT_DELAYED_WORK(&di->set_charged_work,
568                           ds2760_battery_set_charged_work);
569         di->monitor_wqueue = create_singlethread_workqueue(dev_name(&pdev->dev));
570         if (!di->monitor_wqueue) {
571                 retval = -ESRCH;
572                 goto workqueue_failed;
573         }
574         queue_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ * 1);
575
576         goto success;
577
578 workqueue_failed:
579         power_supply_unregister(&di->bat);
580 batt_failed:
581         kfree(di);
582 di_alloc_failed:
583 success:
584         return retval;
585 }
586
587 static int ds2760_battery_remove(struct platform_device *pdev)
588 {
589         struct ds2760_device_info *di = platform_get_drvdata(pdev);
590
591         cancel_delayed_work_sync(&di->monitor_work);
592         cancel_delayed_work_sync(&di->set_charged_work);
593         destroy_workqueue(di->monitor_wqueue);
594         power_supply_unregister(&di->bat);
595         kfree(di);
596
597         return 0;
598 }
599
600 #ifdef CONFIG_PM
601
602 static int ds2760_battery_suspend(struct platform_device *pdev,
603                                   pm_message_t state)
604 {
605         struct ds2760_device_info *di = platform_get_drvdata(pdev);
606
607         di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;
608
609         return 0;
610 }
611
612 static int ds2760_battery_resume(struct platform_device *pdev)
613 {
614         struct ds2760_device_info *di = platform_get_drvdata(pdev);
615
616         di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;
617         power_supply_changed(&di->bat);
618
619         cancel_delayed_work(&di->monitor_work);
620         queue_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ);
621
622         return 0;
623 }
624
625 #else
626
627 #define ds2760_battery_suspend NULL
628 #define ds2760_battery_resume NULL
629
630 #endif /* CONFIG_PM */
631
632 MODULE_ALIAS("platform:ds2760-battery");
633
634 static struct platform_driver ds2760_battery_driver = {
635         .driver = {
636                 .name = "ds2760-battery",
637         },
638         .probe    = ds2760_battery_probe,
639         .remove   = ds2760_battery_remove,
640         .suspend  = ds2760_battery_suspend,
641         .resume   = ds2760_battery_resume,
642 };
643
644 module_platform_driver(ds2760_battery_driver);
645
646 MODULE_LICENSE("GPL");
647 MODULE_AUTHOR("Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>, "
648               "Matt Reimer <mreimer@vpop.net>, "
649               "Anton Vorontsov <cbou@mail.ru>");
650 MODULE_DESCRIPTION("ds2760 battery driver");