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Linux/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         mod_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ/10);
359 }
360 
361 
362 static void ds2760_battery_set_charged_work(struct work_struct *work)
363 {
364         char bias;
365         struct ds2760_device_info *di = container_of(work,
366                 struct ds2760_device_info, set_charged_work.work);
367 
368         dev_dbg(di->dev, "%s\n", __func__);
369 
370         ds2760_battery_read_status(di);
371 
372         /* When we get notified by external circuitry that the battery is
373          * considered fully charged now, we know that there is no current
374          * flow any more. However, the ds2760's internal current meter is
375          * too inaccurate to rely on - spec say something ~15% failure.
376          * Hence, we use the current offset bias register to compensate
377          * that error.
378          */
379 
380         if (!power_supply_am_i_supplied(&di->bat))
381                 return;
382 
383         bias = (signed char) di->current_raw +
384                 (signed char) di->raw[DS2760_CURRENT_OFFSET_BIAS];
385 
386         dev_dbg(di->dev, "%s: bias = %d\n", __func__, bias);
387 
388         w1_ds2760_write(di->w1_dev, &bias, DS2760_CURRENT_OFFSET_BIAS, 1);
389         w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);
390         w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);
391 
392         /* Write to the di->raw[] buffer directly - the CURRENT_OFFSET_BIAS
393          * value won't be read back by ds2760_battery_read_status() */
394         di->raw[DS2760_CURRENT_OFFSET_BIAS] = bias;
395 }
396 
397 static void ds2760_battery_set_charged(struct power_supply *psy)
398 {
399         struct ds2760_device_info *di = to_ds2760_device_info(psy);
400 
401         /* postpone the actual work by 20 secs. This is for debouncing GPIO
402          * signals and to let the current value settle. See AN4188. */
403         mod_delayed_work(di->monitor_wqueue, &di->set_charged_work, HZ * 20);
404 }
405 
406 static int ds2760_battery_get_property(struct power_supply *psy,
407                                        enum power_supply_property psp,
408                                        union power_supply_propval *val)
409 {
410         struct ds2760_device_info *di = to_ds2760_device_info(psy);
411 
412         switch (psp) {
413         case POWER_SUPPLY_PROP_STATUS:
414                 val->intval = di->charge_status;
415                 return 0;
416         default:
417                 break;
418         }
419 
420         ds2760_battery_read_status(di);
421 
422         switch (psp) {
423         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
424                 val->intval = di->voltage_uV;
425                 break;
426         case POWER_SUPPLY_PROP_CURRENT_NOW:
427                 val->intval = di->current_uA;
428                 break;
429         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
430                 val->intval = di->rated_capacity;
431                 break;
432         case POWER_SUPPLY_PROP_CHARGE_FULL:
433                 val->intval = di->full_active_uAh;
434                 break;
435         case POWER_SUPPLY_PROP_CHARGE_EMPTY:
436                 val->intval = di->empty_uAh;
437                 break;
438         case POWER_SUPPLY_PROP_CHARGE_NOW:
439                 val->intval = di->accum_current_uAh;
440                 break;
441         case POWER_SUPPLY_PROP_TEMP:
442                 val->intval = di->temp_C;
443                 break;
444         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
445                 val->intval = di->life_sec;
446                 break;
447         case POWER_SUPPLY_PROP_CAPACITY:
448                 val->intval = di->rem_capacity;
449                 break;
450         default:
451                 return -EINVAL;
452         }
453 
454         return 0;
455 }
456 
457 static int ds2760_battery_set_property(struct power_supply *psy,
458                                        enum power_supply_property psp,
459                                        const union power_supply_propval *val)
460 {
461         struct ds2760_device_info *di = to_ds2760_device_info(psy);
462 
463         switch (psp) {
464         case POWER_SUPPLY_PROP_CHARGE_FULL:
465                 /* the interface counts in uAh, convert the value */
466                 ds2760_battery_write_active_full(di, val->intval / 1000L);
467                 break;
468 
469         case POWER_SUPPLY_PROP_CHARGE_NOW:
470                 /* ds2760_battery_set_current_accum() does the conversion */
471                 ds2760_battery_set_current_accum(di, val->intval);
472                 break;
473 
474         default:
475                 return -EPERM;
476         }
477 
478         return 0;
479 }
480 
481 static int ds2760_battery_property_is_writeable(struct power_supply *psy,
482                                                 enum power_supply_property psp)
483 {
484         switch (psp) {
485         case POWER_SUPPLY_PROP_CHARGE_FULL:
486         case POWER_SUPPLY_PROP_CHARGE_NOW:
487                 return 1;
488 
489         default:
490                 break;
491         }
492 
493         return 0;
494 }
495 
496 static enum power_supply_property ds2760_battery_props[] = {
497         POWER_SUPPLY_PROP_STATUS,
498         POWER_SUPPLY_PROP_VOLTAGE_NOW,
499         POWER_SUPPLY_PROP_CURRENT_NOW,
500         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
501         POWER_SUPPLY_PROP_CHARGE_FULL,
502         POWER_SUPPLY_PROP_CHARGE_EMPTY,
503         POWER_SUPPLY_PROP_CHARGE_NOW,
504         POWER_SUPPLY_PROP_TEMP,
505         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
506         POWER_SUPPLY_PROP_CAPACITY,
507 };
508 
509 static int ds2760_battery_probe(struct platform_device *pdev)
510 {
511         char status;
512         int retval = 0;
513         struct ds2760_device_info *di;
514 
515         di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
516         if (!di) {
517                 retval = -ENOMEM;
518                 goto di_alloc_failed;
519         }
520 
521         platform_set_drvdata(pdev, di);
522 
523         di->dev                 = &pdev->dev;
524         di->w1_dev              = pdev->dev.parent;
525         di->bat.name            = dev_name(&pdev->dev);
526         di->bat.type            = POWER_SUPPLY_TYPE_BATTERY;
527         di->bat.properties      = ds2760_battery_props;
528         di->bat.num_properties  = ARRAY_SIZE(ds2760_battery_props);
529         di->bat.get_property    = ds2760_battery_get_property;
530         di->bat.set_property    = ds2760_battery_set_property;
531         di->bat.property_is_writeable =
532                                   ds2760_battery_property_is_writeable;
533         di->bat.set_charged     = ds2760_battery_set_charged;
534         di->bat.external_power_changed =
535                                   ds2760_battery_external_power_changed;
536 
537         di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;
538 
539         /* enable sleep mode feature */
540         ds2760_battery_read_status(di);
541         status = di->raw[DS2760_STATUS_REG];
542         if (pmod_enabled)
543                 status |= DS2760_STATUS_PMOD;
544         else
545                 status &= ~DS2760_STATUS_PMOD;
546 
547         ds2760_battery_write_status(di, status);
548 
549         /* set rated capacity from module param */
550         if (rated_capacity)
551                 ds2760_battery_write_rated_capacity(di, rated_capacity);
552 
553         /* set current accumulator if given as parameter.
554          * this should only be done for bootstrapping the value */
555         if (current_accum)
556                 ds2760_battery_set_current_accum(di, current_accum);
557 
558         retval = power_supply_register(&pdev->dev, &di->bat);
559         if (retval) {
560                 dev_err(di->dev, "failed to register battery\n");
561                 goto batt_failed;
562         }
563 
564         INIT_DELAYED_WORK(&di->monitor_work, ds2760_battery_work);
565         INIT_DELAYED_WORK(&di->set_charged_work,
566                           ds2760_battery_set_charged_work);
567         di->monitor_wqueue = create_singlethread_workqueue(dev_name(&pdev->dev));
568         if (!di->monitor_wqueue) {
569                 retval = -ESRCH;
570                 goto workqueue_failed;
571         }
572         queue_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ * 1);
573 
574         goto success;
575 
576 workqueue_failed:
577         power_supply_unregister(&di->bat);
578 batt_failed:
579 di_alloc_failed:
580 success:
581         return retval;
582 }
583 
584 static int ds2760_battery_remove(struct platform_device *pdev)
585 {
586         struct ds2760_device_info *di = platform_get_drvdata(pdev);
587 
588         cancel_delayed_work_sync(&di->monitor_work);
589         cancel_delayed_work_sync(&di->set_charged_work);
590         destroy_workqueue(di->monitor_wqueue);
591         power_supply_unregister(&di->bat);
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         mod_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ);
616 
617         return 0;
618 }
619 
620 #else
621 
622 #define ds2760_battery_suspend NULL
623 #define ds2760_battery_resume NULL
624 
625 #endif /* CONFIG_PM */
626 
627 MODULE_ALIAS("platform:ds2760-battery");
628 
629 static struct platform_driver ds2760_battery_driver = {
630         .driver = {
631                 .name = "ds2760-battery",
632         },
633         .probe    = ds2760_battery_probe,
634         .remove   = ds2760_battery_remove,
635         .suspend  = ds2760_battery_suspend,
636         .resume   = ds2760_battery_resume,
637 };
638 
639 module_platform_driver(ds2760_battery_driver);
640 
641 MODULE_LICENSE("GPL");
642 MODULE_AUTHOR("Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>, "
643               "Matt Reimer <mreimer@vpop.net>, "
644               "Anton Vorontsov <cbou@mail.ru>");
645 MODULE_DESCRIPTION("ds2760 battery driver");
646 

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