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Btrfs: deal with short returns from copy_from_user
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / power / ds2760_battery.c
blob4d3b27228a2e0ea6bd844f9ae9fbb4161059a3eb
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");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree