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olpc_battery.c
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1 /*
2  * Battery driver for One Laptop Per Child board.
3  *
4  * Copyright © 2006-2010 David Woodhouse <[email protected]>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  */
10 
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/types.h>
14 #include <linux/err.h>
15 #include <linux/device.h>
16 #include <linux/platform_device.h>
17 #include <linux/power_supply.h>
18 #include <linux/jiffies.h>
19 #include <linux/sched.h>
20 #include <linux/olpc-ec.h>
21 #include <asm/olpc.h>
22 
23 
24 #define EC_BAT_VOLTAGE 0x10 /* uint16_t, *9.76/32, mV */
25 #define EC_BAT_CURRENT 0x11 /* int16_t, *15.625/120, mA */
26 #define EC_BAT_ACR 0x12 /* int16_t, *6250/15, µAh */
27 #define EC_BAT_TEMP 0x13 /* uint16_t, *100/256, °C */
28 #define EC_AMB_TEMP 0x14 /* uint16_t, *100/256, °C */
29 #define EC_BAT_STATUS 0x15 /* uint8_t, bitmask */
30 #define EC_BAT_SOC 0x16 /* uint8_t, percentage */
31 #define EC_BAT_SERIAL 0x17 /* uint8_t[6] */
32 #define EC_BAT_EEPROM 0x18 /* uint8_t adr as input, uint8_t output */
33 #define EC_BAT_ERRCODE 0x1f /* uint8_t, bitmask */
34 
35 #define BAT_STAT_PRESENT 0x01
36 #define BAT_STAT_FULL 0x02
37 #define BAT_STAT_LOW 0x04
38 #define BAT_STAT_DESTROY 0x08
39 #define BAT_STAT_AC 0x10
40 #define BAT_STAT_CHARGING 0x20
41 #define BAT_STAT_DISCHARGING 0x40
42 #define BAT_STAT_TRICKLE 0x80
43 
44 #define BAT_ERR_INFOFAIL 0x02
45 #define BAT_ERR_OVERVOLTAGE 0x04
46 #define BAT_ERR_OVERTEMP 0x05
47 #define BAT_ERR_GAUGESTOP 0x06
48 #define BAT_ERR_OUT_OF_CONTROL 0x07
49 #define BAT_ERR_ID_FAIL 0x09
50 #define BAT_ERR_ACR_FAIL 0x10
51 
52 #define BAT_ADDR_MFR_TYPE 0x5F
53 
54 /*********************************************************************
55  * Power
56  *********************************************************************/
57 
58 static int olpc_ac_get_prop(struct power_supply *psy,
59  enum power_supply_property psp,
60  union power_supply_propval *val)
61 {
62  int ret = 0;
63  uint8_t status;
64 
65  switch (psp) {
66  case POWER_SUPPLY_PROP_ONLINE:
67  ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &status, 1);
68  if (ret)
69  return ret;
70 
71  val->intval = !!(status & BAT_STAT_AC);
72  break;
73  default:
74  ret = -EINVAL;
75  break;
76  }
77  return ret;
78 }
79 
80 static enum power_supply_property olpc_ac_props[] = {
81  POWER_SUPPLY_PROP_ONLINE,
82 };
83 
84 static struct power_supply olpc_ac = {
85  .name = "olpc-ac",
86  .type = POWER_SUPPLY_TYPE_MAINS,
87  .properties = olpc_ac_props,
88  .num_properties = ARRAY_SIZE(olpc_ac_props),
89  .get_property = olpc_ac_get_prop,
90 };
91 
92 static char bat_serial[17]; /* Ick */
93 
94 static int olpc_bat_get_status(union power_supply_propval *val, uint8_t ec_byte)
95 {
96  if (olpc_platform_info.ecver > 0x44) {
97  if (ec_byte & (BAT_STAT_CHARGING | BAT_STAT_TRICKLE))
98  val->intval = POWER_SUPPLY_STATUS_CHARGING;
99  else if (ec_byte & BAT_STAT_DISCHARGING)
100  val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
101  else if (ec_byte & BAT_STAT_FULL)
102  val->intval = POWER_SUPPLY_STATUS_FULL;
103  else /* er,... */
104  val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
105  } else {
106  /* Older EC didn't report charge/discharge bits */
107  if (!(ec_byte & BAT_STAT_AC)) /* No AC means discharging */
108  val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
109  else if (ec_byte & BAT_STAT_FULL)
110  val->intval = POWER_SUPPLY_STATUS_FULL;
111  else /* Not _necessarily_ true but EC doesn't tell all yet */
112  val->intval = POWER_SUPPLY_STATUS_CHARGING;
113  }
114 
115  return 0;
116 }
117 
118 static int olpc_bat_get_health(union power_supply_propval *val)
119 {
120  uint8_t ec_byte;
121  int ret;
122 
123  ret = olpc_ec_cmd(EC_BAT_ERRCODE, NULL, 0, &ec_byte, 1);
124  if (ret)
125  return ret;
126 
127  switch (ec_byte) {
128  case 0:
129  val->intval = POWER_SUPPLY_HEALTH_GOOD;
130  break;
131 
132  case BAT_ERR_OVERTEMP:
133  val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
134  break;
135 
136  case BAT_ERR_OVERVOLTAGE:
137  val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
138  break;
139 
140  case BAT_ERR_INFOFAIL:
141  case BAT_ERR_OUT_OF_CONTROL:
142  case BAT_ERR_ID_FAIL:
143  case BAT_ERR_ACR_FAIL:
144  val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
145  break;
146 
147  default:
148  /* Eep. We don't know this failure code */
149  ret = -EIO;
150  }
151 
152  return ret;
153 }
154 
155 static int olpc_bat_get_mfr(union power_supply_propval *val)
156 {
157  uint8_t ec_byte;
158  int ret;
159 
160  ec_byte = BAT_ADDR_MFR_TYPE;
161  ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1);
162  if (ret)
163  return ret;
164 
165  switch (ec_byte >> 4) {
166  case 1:
167  val->strval = "Gold Peak";
168  break;
169  case 2:
170  val->strval = "BYD";
171  break;
172  default:
173  val->strval = "Unknown";
174  break;
175  }
176 
177  return ret;
178 }
179 
180 static int olpc_bat_get_tech(union power_supply_propval *val)
181 {
182  uint8_t ec_byte;
183  int ret;
184 
185  ec_byte = BAT_ADDR_MFR_TYPE;
186  ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1);
187  if (ret)
188  return ret;
189 
190  switch (ec_byte & 0xf) {
191  case 1:
192  val->intval = POWER_SUPPLY_TECHNOLOGY_NiMH;
193  break;
194  case 2:
195  val->intval = POWER_SUPPLY_TECHNOLOGY_LiFe;
196  break;
197  default:
198  val->intval = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
199  break;
200  }
201 
202  return ret;
203 }
204 
205 static int olpc_bat_get_charge_full_design(union power_supply_propval *val)
206 {
207  uint8_t ec_byte;
208  union power_supply_propval tech;
209  int ret, mfr;
210 
211  ret = olpc_bat_get_tech(&tech);
212  if (ret)
213  return ret;
214 
215  ec_byte = BAT_ADDR_MFR_TYPE;
216  ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1);
217  if (ret)
218  return ret;
219 
220  mfr = ec_byte >> 4;
221 
222  switch (tech.intval) {
223  case POWER_SUPPLY_TECHNOLOGY_NiMH:
224  switch (mfr) {
225  case 1: /* Gold Peak */
226  val->intval = 3000000*.8;
227  break;
228  default:
229  return -EIO;
230  }
231  break;
232 
233  case POWER_SUPPLY_TECHNOLOGY_LiFe:
234  switch (mfr) {
235  case 1: /* Gold Peak, fall through */
236  case 2: /* BYD */
237  val->intval = 2800000;
238  break;
239  default:
240  return -EIO;
241  }
242  break;
243 
244  default:
245  return -EIO;
246  }
247 
248  return ret;
249 }
250 
251 static int olpc_bat_get_charge_now(union power_supply_propval *val)
252 {
253  uint8_t soc;
254  union power_supply_propval full;
255  int ret;
256 
257  ret = olpc_ec_cmd(EC_BAT_SOC, NULL, 0, &soc, 1);
258  if (ret)
259  return ret;
260 
261  ret = olpc_bat_get_charge_full_design(&full);
262  if (ret)
263  return ret;
264 
265  val->intval = soc * (full.intval / 100);
266  return 0;
267 }
268 
269 static int olpc_bat_get_voltage_max_design(union power_supply_propval *val)
270 {
271  uint8_t ec_byte;
272  union power_supply_propval tech;
273  int mfr;
274  int ret;
275 
276  ret = olpc_bat_get_tech(&tech);
277  if (ret)
278  return ret;
279 
280  ec_byte = BAT_ADDR_MFR_TYPE;
281  ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1);
282  if (ret)
283  return ret;
284 
285  mfr = ec_byte >> 4;
286 
287  switch (tech.intval) {
288  case POWER_SUPPLY_TECHNOLOGY_NiMH:
289  switch (mfr) {
290  case 1: /* Gold Peak */
291  val->intval = 6000000;
292  break;
293  default:
294  return -EIO;
295  }
296  break;
297 
298  case POWER_SUPPLY_TECHNOLOGY_LiFe:
299  switch (mfr) {
300  case 1: /* Gold Peak */
301  val->intval = 6400000;
302  break;
303  case 2: /* BYD */
304  val->intval = 6500000;
305  break;
306  default:
307  return -EIO;
308  }
309  break;
310 
311  default:
312  return -EIO;
313  }
314 
315  return ret;
316 }
317 
318 /*********************************************************************
319  * Battery properties
320  *********************************************************************/
321 static int olpc_bat_get_property(struct power_supply *psy,
322  enum power_supply_property psp,
323  union power_supply_propval *val)
324 {
325  int ret = 0;
326  __be16 ec_word;
327  uint8_t ec_byte;
328  __be64 ser_buf;
329 
330  ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &ec_byte, 1);
331  if (ret)
332  return ret;
333 
334  /* Theoretically there's a race here -- the battery could be
335  removed immediately after we check whether it's present, and
336  then we query for some other property of the now-absent battery.
337  It doesn't matter though -- the EC will return the last-known
338  information, and it's as if we just ran that _little_ bit faster
339  and managed to read it out before the battery went away. */
340  if (!(ec_byte & (BAT_STAT_PRESENT | BAT_STAT_TRICKLE)) &&
341  psp != POWER_SUPPLY_PROP_PRESENT)
342  return -ENODEV;
343 
344  switch (psp) {
345  case POWER_SUPPLY_PROP_STATUS:
346  ret = olpc_bat_get_status(val, ec_byte);
347  if (ret)
348  return ret;
349  break;
350  case POWER_SUPPLY_PROP_CHARGE_TYPE:
351  if (ec_byte & BAT_STAT_TRICKLE)
352  val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
353  else if (ec_byte & BAT_STAT_CHARGING)
354  val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
355  else
356  val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
357  break;
358  case POWER_SUPPLY_PROP_PRESENT:
359  val->intval = !!(ec_byte & (BAT_STAT_PRESENT |
360  BAT_STAT_TRICKLE));
361  break;
362 
363  case POWER_SUPPLY_PROP_HEALTH:
364  if (ec_byte & BAT_STAT_DESTROY)
365  val->intval = POWER_SUPPLY_HEALTH_DEAD;
366  else {
367  ret = olpc_bat_get_health(val);
368  if (ret)
369  return ret;
370  }
371  break;
372 
373  case POWER_SUPPLY_PROP_MANUFACTURER:
374  ret = olpc_bat_get_mfr(val);
375  if (ret)
376  return ret;
377  break;
378  case POWER_SUPPLY_PROP_TECHNOLOGY:
379  ret = olpc_bat_get_tech(val);
380  if (ret)
381  return ret;
382  break;
383  case POWER_SUPPLY_PROP_VOLTAGE_AVG:
384  case POWER_SUPPLY_PROP_VOLTAGE_NOW:
385  ret = olpc_ec_cmd(EC_BAT_VOLTAGE, NULL, 0, (void *)&ec_word, 2);
386  if (ret)
387  return ret;
388 
389  val->intval = (s16)be16_to_cpu(ec_word) * 9760L / 32;
390  break;
391  case POWER_SUPPLY_PROP_CURRENT_AVG:
392  case POWER_SUPPLY_PROP_CURRENT_NOW:
393  ret = olpc_ec_cmd(EC_BAT_CURRENT, NULL, 0, (void *)&ec_word, 2);
394  if (ret)
395  return ret;
396 
397  val->intval = (s16)be16_to_cpu(ec_word) * 15625L / 120;
398  break;
399  case POWER_SUPPLY_PROP_CAPACITY:
400  ret = olpc_ec_cmd(EC_BAT_SOC, NULL, 0, &ec_byte, 1);
401  if (ret)
402  return ret;
403  val->intval = ec_byte;
404  break;
405  case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
406  if (ec_byte & BAT_STAT_FULL)
407  val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
408  else if (ec_byte & BAT_STAT_LOW)
409  val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
410  else
411  val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
412  break;
413  case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
414  ret = olpc_bat_get_charge_full_design(val);
415  if (ret)
416  return ret;
417  break;
418  case POWER_SUPPLY_PROP_CHARGE_NOW:
419  ret = olpc_bat_get_charge_now(val);
420  if (ret)
421  return ret;
422  break;
423  case POWER_SUPPLY_PROP_TEMP:
424  ret = olpc_ec_cmd(EC_BAT_TEMP, NULL, 0, (void *)&ec_word, 2);
425  if (ret)
426  return ret;
427 
428  val->intval = (s16)be16_to_cpu(ec_word) * 100 / 256;
429  break;
430  case POWER_SUPPLY_PROP_TEMP_AMBIENT:
431  ret = olpc_ec_cmd(EC_AMB_TEMP, NULL, 0, (void *)&ec_word, 2);
432  if (ret)
433  return ret;
434 
435  val->intval = (int)be16_to_cpu(ec_word) * 100 / 256;
436  break;
437  case POWER_SUPPLY_PROP_CHARGE_COUNTER:
438  ret = olpc_ec_cmd(EC_BAT_ACR, NULL, 0, (void *)&ec_word, 2);
439  if (ret)
440  return ret;
441 
442  val->intval = (s16)be16_to_cpu(ec_word) * 6250 / 15;
443  break;
444  case POWER_SUPPLY_PROP_SERIAL_NUMBER:
445  ret = olpc_ec_cmd(EC_BAT_SERIAL, NULL, 0, (void *)&ser_buf, 8);
446  if (ret)
447  return ret;
448 
449  sprintf(bat_serial, "%016llx", (long long)be64_to_cpu(ser_buf));
450  val->strval = bat_serial;
451  break;
452  case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
453  ret = olpc_bat_get_voltage_max_design(val);
454  if (ret)
455  return ret;
456  break;
457  default:
458  ret = -EINVAL;
459  break;
460  }
461 
462  return ret;
463 }
464 
465 static enum power_supply_property olpc_xo1_bat_props[] = {
466  POWER_SUPPLY_PROP_STATUS,
467  POWER_SUPPLY_PROP_CHARGE_TYPE,
468  POWER_SUPPLY_PROP_PRESENT,
469  POWER_SUPPLY_PROP_HEALTH,
470  POWER_SUPPLY_PROP_TECHNOLOGY,
471  POWER_SUPPLY_PROP_VOLTAGE_AVG,
472  POWER_SUPPLY_PROP_VOLTAGE_NOW,
473  POWER_SUPPLY_PROP_CURRENT_AVG,
474  POWER_SUPPLY_PROP_CURRENT_NOW,
475  POWER_SUPPLY_PROP_CAPACITY,
476  POWER_SUPPLY_PROP_CAPACITY_LEVEL,
477  POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
478  POWER_SUPPLY_PROP_CHARGE_NOW,
479  POWER_SUPPLY_PROP_TEMP,
480  POWER_SUPPLY_PROP_TEMP_AMBIENT,
481  POWER_SUPPLY_PROP_MANUFACTURER,
482  POWER_SUPPLY_PROP_SERIAL_NUMBER,
483  POWER_SUPPLY_PROP_CHARGE_COUNTER,
484  POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
485 };
486 
487 /* XO-1.5 does not have ambient temperature property */
488 static enum power_supply_property olpc_xo15_bat_props[] = {
489  POWER_SUPPLY_PROP_STATUS,
490  POWER_SUPPLY_PROP_CHARGE_TYPE,
491  POWER_SUPPLY_PROP_PRESENT,
492  POWER_SUPPLY_PROP_HEALTH,
493  POWER_SUPPLY_PROP_TECHNOLOGY,
494  POWER_SUPPLY_PROP_VOLTAGE_AVG,
495  POWER_SUPPLY_PROP_VOLTAGE_NOW,
496  POWER_SUPPLY_PROP_CURRENT_AVG,
497  POWER_SUPPLY_PROP_CURRENT_NOW,
498  POWER_SUPPLY_PROP_CAPACITY,
499  POWER_SUPPLY_PROP_CAPACITY_LEVEL,
500  POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
501  POWER_SUPPLY_PROP_CHARGE_NOW,
502  POWER_SUPPLY_PROP_TEMP,
503  POWER_SUPPLY_PROP_MANUFACTURER,
504  POWER_SUPPLY_PROP_SERIAL_NUMBER,
505  POWER_SUPPLY_PROP_CHARGE_COUNTER,
506  POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
507 };
508 
509 /* EEPROM reading goes completely around the power_supply API, sadly */
510 
511 #define EEPROM_START 0x20
512 #define EEPROM_END 0x80
513 #define EEPROM_SIZE (EEPROM_END - EEPROM_START)
514 
515 static ssize_t olpc_bat_eeprom_read(struct file *filp, struct kobject *kobj,
516  struct bin_attribute *attr, char *buf, loff_t off, size_t count)
517 {
518  uint8_t ec_byte;
519  int ret;
520  int i;
521 
522  if (off >= EEPROM_SIZE)
523  return 0;
524  if (off + count > EEPROM_SIZE)
525  count = EEPROM_SIZE - off;
526 
527  for (i = 0; i < count; i++) {
528  ec_byte = EEPROM_START + off + i;
529  ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &buf[i], 1);
530  if (ret) {
531  pr_err("olpc-battery: "
532  "EC_BAT_EEPROM cmd @ 0x%x failed - %d!\n",
533  ec_byte, ret);
534  return -EIO;
535  }
536  }
537 
538  return count;
539 }
540 
541 static struct bin_attribute olpc_bat_eeprom = {
542  .attr = {
543  .name = "eeprom",
544  .mode = S_IRUGO,
545  },
546  .size = 0,
547  .read = olpc_bat_eeprom_read,
548 };
549 
550 /* Allow userspace to see the specific error value pulled from the EC */
551 
552 static ssize_t olpc_bat_error_read(struct device *dev,
553  struct device_attribute *attr, char *buf)
554 {
555  uint8_t ec_byte;
556  ssize_t ret;
557 
558  ret = olpc_ec_cmd(EC_BAT_ERRCODE, NULL, 0, &ec_byte, 1);
559  if (ret < 0)
560  return ret;
561 
562  return sprintf(buf, "%d\n", ec_byte);
563 }
564 
565 static struct device_attribute olpc_bat_error = {
566  .attr = {
567  .name = "error",
568  .mode = S_IRUGO,
569  },
570  .show = olpc_bat_error_read,
571 };
572 
573 /*********************************************************************
574  * Initialisation
575  *********************************************************************/
576 
577 static struct power_supply olpc_bat = {
578  .name = "olpc-battery",
579  .get_property = olpc_bat_get_property,
580  .use_for_apm = 1,
581 };
582 
583 static int olpc_battery_suspend(struct platform_device *pdev,
584  pm_message_t state)
585 {
586  if (device_may_wakeup(olpc_ac.dev))
587  olpc_ec_wakeup_set(EC_SCI_SRC_ACPWR);
588  else
589  olpc_ec_wakeup_clear(EC_SCI_SRC_ACPWR);
590 
591  if (device_may_wakeup(olpc_bat.dev))
592  olpc_ec_wakeup_set(EC_SCI_SRC_BATTERY | EC_SCI_SRC_BATSOC
593  | EC_SCI_SRC_BATERR);
594  else
595  olpc_ec_wakeup_clear(EC_SCI_SRC_BATTERY | EC_SCI_SRC_BATSOC
596  | EC_SCI_SRC_BATERR);
597 
598  return 0;
599 }
600 
601 static int __devinit olpc_battery_probe(struct platform_device *pdev)
602 {
603  int ret;
604  uint8_t status;
605 
606  /*
607  * We've seen a number of EC protocol changes; this driver requires
608  * the latest EC protocol, supported by 0x44 and above.
609  */
610  if (olpc_platform_info.ecver < 0x44) {
611  printk(KERN_NOTICE "OLPC EC version 0x%02x too old for "
612  "battery driver.\n", olpc_platform_info.ecver);
613  return -ENXIO;
614  }
615 
616  ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &status, 1);
617  if (ret)
618  return ret;
619 
620  /* Ignore the status. It doesn't actually matter */
621 
622  ret = power_supply_register(&pdev->dev, &olpc_ac);
623  if (ret)
624  return ret;
625 
626  if (olpc_board_at_least(olpc_board_pre(0xd0))) { /* XO-1.5 */
627  olpc_bat.properties = olpc_xo15_bat_props;
628  olpc_bat.num_properties = ARRAY_SIZE(olpc_xo15_bat_props);
629  } else { /* XO-1 */
630  olpc_bat.properties = olpc_xo1_bat_props;
631  olpc_bat.num_properties = ARRAY_SIZE(olpc_xo1_bat_props);
632  }
633 
634  ret = power_supply_register(&pdev->dev, &olpc_bat);
635  if (ret)
636  goto battery_failed;
637 
638  ret = device_create_bin_file(olpc_bat.dev, &olpc_bat_eeprom);
639  if (ret)
640  goto eeprom_failed;
641 
642  ret = device_create_file(olpc_bat.dev, &olpc_bat_error);
643  if (ret)
644  goto error_failed;
645 
646  if (olpc_ec_wakeup_available()) {
647  device_set_wakeup_capable(olpc_ac.dev, true);
648  device_set_wakeup_capable(olpc_bat.dev, true);
649  }
650 
651  return 0;
652 
653 error_failed:
654  device_remove_bin_file(olpc_bat.dev, &olpc_bat_eeprom);
655 eeprom_failed:
656  power_supply_unregister(&olpc_bat);
657 battery_failed:
658  power_supply_unregister(&olpc_ac);
659  return ret;
660 }
661 
662 static int __devexit olpc_battery_remove(struct platform_device *pdev)
663 {
664  device_remove_file(olpc_bat.dev, &olpc_bat_error);
665  device_remove_bin_file(olpc_bat.dev, &olpc_bat_eeprom);
666  power_supply_unregister(&olpc_bat);
667  power_supply_unregister(&olpc_ac);
668  return 0;
669 }
670 
671 static const struct of_device_id olpc_battery_ids[] __devinitconst = {
672  { .compatible = "olpc,xo1-battery" },
673  {}
674 };
675 MODULE_DEVICE_TABLE(of, olpc_battery_ids);
676 
677 static struct platform_driver olpc_battery_driver = {
678  .driver = {
679  .name = "olpc-battery",
680  .owner = THIS_MODULE,
681  .of_match_table = olpc_battery_ids,
682  },
683  .probe = olpc_battery_probe,
684  .remove = __devexit_p(olpc_battery_remove),
685  .suspend = olpc_battery_suspend,
686 };
687 
688 module_platform_driver(olpc_battery_driver);
689 
690 MODULE_AUTHOR("David Woodhouse <[email protected]>");
691 MODULE_LICENSE("GPL");
692 MODULE_DESCRIPTION("Battery driver for One Laptop Per Child 'XO' machine");
Generated on Thu Jan 10 2013 14:16:07 for Linux Kernel by   doxygen 1.8.2