GNU Linux-libre 4.4.289-gnu1
[releases.git] / drivers / acpi / sbs.c
1 /*
2  *  sbs.c - ACPI Smart Battery System Driver ($Revision: 2.0 $)
3  *
4  *  Copyright (c) 2007 Alexey Starikovskiy <astarikovskiy@suse.de>
5  *  Copyright (c) 2005-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com>
6  *  Copyright (c) 2005 Rich Townsend <rhdt@bartol.udel.edu>
7  *
8  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9  *
10  *  This program is free software; you can redistribute it and/or modify
11  *  it under the terms of the GNU General Public License as published by
12  *  the Free Software Foundation; either version 2 of the License, or (at
13  *  your option) any later version.
14  *
15  *  This program is distributed in the hope that it will be useful, but
16  *  WITHOUT ANY WARRANTY; without even the implied warranty of
17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18  *  General Public License for more details.
19  *
20  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
21  */
22
23 #include <linux/init.h>
24 #include <linux/slab.h>
25 #include <linux/module.h>
26 #include <linux/moduleparam.h>
27 #include <linux/kernel.h>
28
29 #include <linux/acpi.h>
30 #include <linux/timer.h>
31 #include <linux/jiffies.h>
32 #include <linux/delay.h>
33 #include <linux/power_supply.h>
34 #include <linux/dmi.h>
35
36 #include "sbshc.h"
37 #include "battery.h"
38
39 #define PREFIX "ACPI: "
40
41 #define ACPI_SBS_CLASS                  "sbs"
42 #define ACPI_AC_CLASS                   "ac_adapter"
43 #define ACPI_SBS_DEVICE_NAME            "Smart Battery System"
44 #define ACPI_SBS_FILE_INFO              "info"
45 #define ACPI_SBS_FILE_STATE             "state"
46 #define ACPI_SBS_FILE_ALARM             "alarm"
47 #define ACPI_BATTERY_DIR_NAME           "BAT%i"
48 #define ACPI_AC_DIR_NAME                "AC0"
49
50 #define ACPI_SBS_NOTIFY_STATUS          0x80
51 #define ACPI_SBS_NOTIFY_INFO            0x81
52
53 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
54 MODULE_DESCRIPTION("Smart Battery System ACPI interface driver");
55 MODULE_LICENSE("GPL");
56
57 static unsigned int cache_time = 1000;
58 module_param(cache_time, uint, 0644);
59 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
60
61 static bool sbs_manager_broken;
62
63 #define MAX_SBS_BAT                     4
64 #define ACPI_SBS_BLOCK_MAX              32
65
66 static const struct acpi_device_id sbs_device_ids[] = {
67         {"ACPI0002", 0},
68         {"", 0},
69 };
70 MODULE_DEVICE_TABLE(acpi, sbs_device_ids);
71
72 struct acpi_battery {
73         struct power_supply *bat;
74         struct power_supply_desc bat_desc;
75         struct acpi_sbs *sbs;
76         unsigned long update_time;
77         char name[8];
78         char manufacturer_name[ACPI_SBS_BLOCK_MAX];
79         char device_name[ACPI_SBS_BLOCK_MAX];
80         char device_chemistry[ACPI_SBS_BLOCK_MAX];
81         u16 alarm_capacity;
82         u16 full_charge_capacity;
83         u16 design_capacity;
84         u16 design_voltage;
85         u16 serial_number;
86         u16 cycle_count;
87         u16 temp_now;
88         u16 voltage_now;
89         s16 rate_now;
90         s16 rate_avg;
91         u16 capacity_now;
92         u16 state_of_charge;
93         u16 state;
94         u16 mode;
95         u16 spec;
96         u8 id;
97         u8 present:1;
98         u8 have_sysfs_alarm:1;
99 };
100
101 #define to_acpi_battery(x) power_supply_get_drvdata(x)
102
103 struct acpi_sbs {
104         struct power_supply *charger;
105         struct acpi_device *device;
106         struct acpi_smb_hc *hc;
107         struct mutex lock;
108         struct acpi_battery battery[MAX_SBS_BAT];
109         u8 batteries_supported:4;
110         u8 manager_present:1;
111         u8 charger_present:1;
112         u8 charger_exists:1;
113 };
114
115 #define to_acpi_sbs(x) power_supply_get_drvdata(x)
116
117 static int acpi_sbs_remove(struct acpi_device *device);
118 static int acpi_battery_get_state(struct acpi_battery *battery);
119
120 static inline int battery_scale(int log)
121 {
122         int scale = 1;
123         while (log--)
124                 scale *= 10;
125         return scale;
126 }
127
128 static inline int acpi_battery_vscale(struct acpi_battery *battery)
129 {
130         return battery_scale((battery->spec & 0x0f00) >> 8);
131 }
132
133 static inline int acpi_battery_ipscale(struct acpi_battery *battery)
134 {
135         return battery_scale((battery->spec & 0xf000) >> 12);
136 }
137
138 static inline int acpi_battery_mode(struct acpi_battery *battery)
139 {
140         return (battery->mode & 0x8000);
141 }
142
143 static inline int acpi_battery_scale(struct acpi_battery *battery)
144 {
145         return (acpi_battery_mode(battery) ? 10 : 1) *
146             acpi_battery_ipscale(battery);
147 }
148
149 static int sbs_get_ac_property(struct power_supply *psy,
150                                enum power_supply_property psp,
151                                union power_supply_propval *val)
152 {
153         struct acpi_sbs *sbs = to_acpi_sbs(psy);
154         switch (psp) {
155         case POWER_SUPPLY_PROP_ONLINE:
156                 val->intval = sbs->charger_present;
157                 break;
158         default:
159                 return -EINVAL;
160         }
161         return 0;
162 }
163
164 static int acpi_battery_technology(struct acpi_battery *battery)
165 {
166         if (!strcasecmp("NiCd", battery->device_chemistry))
167                 return POWER_SUPPLY_TECHNOLOGY_NiCd;
168         if (!strcasecmp("NiMH", battery->device_chemistry))
169                 return POWER_SUPPLY_TECHNOLOGY_NiMH;
170         if (!strcasecmp("LION", battery->device_chemistry))
171                 return POWER_SUPPLY_TECHNOLOGY_LION;
172         if (!strcasecmp("LiP", battery->device_chemistry))
173                 return POWER_SUPPLY_TECHNOLOGY_LIPO;
174         return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
175 }
176
177 static int acpi_sbs_battery_get_property(struct power_supply *psy,
178                                          enum power_supply_property psp,
179                                          union power_supply_propval *val)
180 {
181         struct acpi_battery *battery = to_acpi_battery(psy);
182
183         if ((!battery->present) && psp != POWER_SUPPLY_PROP_PRESENT)
184                 return -ENODEV;
185
186         acpi_battery_get_state(battery);
187         switch (psp) {
188         case POWER_SUPPLY_PROP_STATUS:
189                 if (battery->rate_now < 0)
190                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
191                 else if (battery->rate_now > 0)
192                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
193                 else
194                         val->intval = POWER_SUPPLY_STATUS_FULL;
195                 break;
196         case POWER_SUPPLY_PROP_PRESENT:
197                 val->intval = battery->present;
198                 break;
199         case POWER_SUPPLY_PROP_TECHNOLOGY:
200                 val->intval = acpi_battery_technology(battery);
201                 break;
202         case POWER_SUPPLY_PROP_CYCLE_COUNT:
203                 val->intval = battery->cycle_count;
204                 break;
205         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
206                 val->intval = battery->design_voltage *
207                         acpi_battery_vscale(battery) * 1000;
208                 break;
209         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
210                 val->intval = battery->voltage_now *
211                                 acpi_battery_vscale(battery) * 1000;
212                 break;
213         case POWER_SUPPLY_PROP_CURRENT_NOW:
214         case POWER_SUPPLY_PROP_POWER_NOW:
215                 val->intval = abs(battery->rate_now) *
216                                 acpi_battery_ipscale(battery) * 1000;
217                 val->intval *= (acpi_battery_mode(battery)) ?
218                                 (battery->voltage_now *
219                                 acpi_battery_vscale(battery) / 1000) : 1;
220                 break;
221         case POWER_SUPPLY_PROP_CURRENT_AVG:
222         case POWER_SUPPLY_PROP_POWER_AVG:
223                 val->intval = abs(battery->rate_avg) *
224                                 acpi_battery_ipscale(battery) * 1000;
225                 val->intval *= (acpi_battery_mode(battery)) ?
226                                 (battery->voltage_now *
227                                 acpi_battery_vscale(battery) / 1000) : 1;
228                 break;
229         case POWER_SUPPLY_PROP_CAPACITY:
230                 val->intval = battery->state_of_charge;
231                 break;
232         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
233         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
234                 val->intval = battery->design_capacity *
235                         acpi_battery_scale(battery) * 1000;
236                 break;
237         case POWER_SUPPLY_PROP_CHARGE_FULL:
238         case POWER_SUPPLY_PROP_ENERGY_FULL:
239                 val->intval = battery->full_charge_capacity *
240                         acpi_battery_scale(battery) * 1000;
241                 break;
242         case POWER_SUPPLY_PROP_CHARGE_NOW:
243         case POWER_SUPPLY_PROP_ENERGY_NOW:
244                 val->intval = battery->capacity_now *
245                                 acpi_battery_scale(battery) * 1000;
246                 break;
247         case POWER_SUPPLY_PROP_TEMP:
248                 val->intval = battery->temp_now - 2730; // dK -> dC
249                 break;
250         case POWER_SUPPLY_PROP_MODEL_NAME:
251                 val->strval = battery->device_name;
252                 break;
253         case POWER_SUPPLY_PROP_MANUFACTURER:
254                 val->strval = battery->manufacturer_name;
255                 break;
256         default:
257                 return -EINVAL;
258         }
259         return 0;
260 }
261
262 static enum power_supply_property sbs_ac_props[] = {
263         POWER_SUPPLY_PROP_ONLINE,
264 };
265
266 static enum power_supply_property sbs_charge_battery_props[] = {
267         POWER_SUPPLY_PROP_STATUS,
268         POWER_SUPPLY_PROP_PRESENT,
269         POWER_SUPPLY_PROP_TECHNOLOGY,
270         POWER_SUPPLY_PROP_CYCLE_COUNT,
271         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
272         POWER_SUPPLY_PROP_VOLTAGE_NOW,
273         POWER_SUPPLY_PROP_CURRENT_NOW,
274         POWER_SUPPLY_PROP_CURRENT_AVG,
275         POWER_SUPPLY_PROP_CAPACITY,
276         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
277         POWER_SUPPLY_PROP_CHARGE_FULL,
278         POWER_SUPPLY_PROP_CHARGE_NOW,
279         POWER_SUPPLY_PROP_TEMP,
280         POWER_SUPPLY_PROP_MODEL_NAME,
281         POWER_SUPPLY_PROP_MANUFACTURER,
282 };
283
284 static enum power_supply_property sbs_energy_battery_props[] = {
285         POWER_SUPPLY_PROP_STATUS,
286         POWER_SUPPLY_PROP_PRESENT,
287         POWER_SUPPLY_PROP_TECHNOLOGY,
288         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
289         POWER_SUPPLY_PROP_VOLTAGE_NOW,
290         POWER_SUPPLY_PROP_CURRENT_NOW,
291         POWER_SUPPLY_PROP_CURRENT_AVG,
292         POWER_SUPPLY_PROP_POWER_NOW,
293         POWER_SUPPLY_PROP_POWER_AVG,
294         POWER_SUPPLY_PROP_CAPACITY,
295         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
296         POWER_SUPPLY_PROP_ENERGY_FULL,
297         POWER_SUPPLY_PROP_ENERGY_NOW,
298         POWER_SUPPLY_PROP_TEMP,
299         POWER_SUPPLY_PROP_MODEL_NAME,
300         POWER_SUPPLY_PROP_MANUFACTURER,
301 };
302
303 static const struct power_supply_desc acpi_sbs_charger_desc = {
304         .name           = "sbs-charger",
305         .type           = POWER_SUPPLY_TYPE_MAINS,
306         .properties     = sbs_ac_props,
307         .num_properties = ARRAY_SIZE(sbs_ac_props),
308         .get_property   = sbs_get_ac_property,
309 };
310
311 /* --------------------------------------------------------------------------
312                             Smart Battery System Management
313    -------------------------------------------------------------------------- */
314
315 struct acpi_battery_reader {
316         u8 command;             /* command for battery */
317         u8 mode;                /* word or block? */
318         size_t offset;          /* offset inside struct acpi_sbs_battery */
319 };
320
321 static struct acpi_battery_reader info_readers[] = {
322         {0x01, SMBUS_READ_WORD, offsetof(struct acpi_battery, alarm_capacity)},
323         {0x03, SMBUS_READ_WORD, offsetof(struct acpi_battery, mode)},
324         {0x10, SMBUS_READ_WORD, offsetof(struct acpi_battery, full_charge_capacity)},
325         {0x17, SMBUS_READ_WORD, offsetof(struct acpi_battery, cycle_count)},
326         {0x18, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_capacity)},
327         {0x19, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_voltage)},
328         {0x1a, SMBUS_READ_WORD, offsetof(struct acpi_battery, spec)},
329         {0x1c, SMBUS_READ_WORD, offsetof(struct acpi_battery, serial_number)},
330         {0x20, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, manufacturer_name)},
331         {0x21, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_name)},
332         {0x22, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_chemistry)},
333 };
334
335 static struct acpi_battery_reader state_readers[] = {
336         {0x08, SMBUS_READ_WORD, offsetof(struct acpi_battery, temp_now)},
337         {0x09, SMBUS_READ_WORD, offsetof(struct acpi_battery, voltage_now)},
338         {0x0a, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_now)},
339         {0x0b, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_avg)},
340         {0x0f, SMBUS_READ_WORD, offsetof(struct acpi_battery, capacity_now)},
341         {0x0e, SMBUS_READ_WORD, offsetof(struct acpi_battery, state_of_charge)},
342         {0x16, SMBUS_READ_WORD, offsetof(struct acpi_battery, state)},
343 };
344
345 static int acpi_manager_get_info(struct acpi_sbs *sbs)
346 {
347         int result = 0;
348         u16 battery_system_info;
349
350         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
351                                  0x04, (u8 *)&battery_system_info);
352         if (!result)
353                 sbs->batteries_supported = battery_system_info & 0x000f;
354         return result;
355 }
356
357 static int acpi_battery_get_info(struct acpi_battery *battery)
358 {
359         int i, result = 0;
360
361         for (i = 0; i < ARRAY_SIZE(info_readers); ++i) {
362                 result = acpi_smbus_read(battery->sbs->hc,
363                                          info_readers[i].mode,
364                                          ACPI_SBS_BATTERY,
365                                          info_readers[i].command,
366                                          (u8 *) battery +
367                                                 info_readers[i].offset);
368                 if (result)
369                         break;
370         }
371         return result;
372 }
373
374 static int acpi_battery_get_state(struct acpi_battery *battery)
375 {
376         int i, result = 0;
377
378         if (battery->update_time &&
379             time_before(jiffies, battery->update_time +
380                                 msecs_to_jiffies(cache_time)))
381                 return 0;
382         for (i = 0; i < ARRAY_SIZE(state_readers); ++i) {
383                 result = acpi_smbus_read(battery->sbs->hc,
384                                          state_readers[i].mode,
385                                          ACPI_SBS_BATTERY,
386                                          state_readers[i].command,
387                                          (u8 *)battery +
388                                                 state_readers[i].offset);
389                 if (result)
390                         goto end;
391         }
392       end:
393         battery->update_time = jiffies;
394         return result;
395 }
396
397 static int acpi_battery_get_alarm(struct acpi_battery *battery)
398 {
399         return acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
400                                  ACPI_SBS_BATTERY, 0x01,
401                                  (u8 *)&battery->alarm_capacity);
402 }
403
404 static int acpi_battery_set_alarm(struct acpi_battery *battery)
405 {
406         struct acpi_sbs *sbs = battery->sbs;
407         u16 value, sel = 1 << (battery->id + 12);
408
409         int ret;
410
411
412         if (sbs->manager_present) {
413                 ret = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
414                                 0x01, (u8 *)&value);
415                 if (ret)
416                         goto end;
417                 if ((value & 0xf000) != sel) {
418                         value &= 0x0fff;
419                         value |= sel;
420                 ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD,
421                                          ACPI_SBS_MANAGER,
422                                          0x01, (u8 *)&value, 2);
423                 if (ret)
424                         goto end;
425                 }
426         }
427         ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD, ACPI_SBS_BATTERY,
428                                 0x01, (u8 *)&battery->alarm_capacity, 2);
429       end:
430         return ret;
431 }
432
433 static int acpi_ac_get_present(struct acpi_sbs *sbs)
434 {
435         int result;
436         u16 status;
437
438         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_CHARGER,
439                                  0x13, (u8 *) & status);
440
441         if (result)
442                 return result;
443
444         /*
445          * The spec requires that bit 4 always be 1. If it's not set, assume
446          * that the implementation doesn't support an SBS charger.
447          *
448          * And on some MacBooks a status of 0xffff is always returned, no
449          * matter whether the charger is plugged in or not, which is also
450          * wrong, so ignore the SBS charger for those too.
451          */
452         if (!((status >> 4) & 0x1) || status == 0xffff)
453                 return -ENODEV;
454
455         sbs->charger_present = (status >> 15) & 0x1;
456         return 0;
457 }
458
459 static ssize_t acpi_battery_alarm_show(struct device *dev,
460                                         struct device_attribute *attr,
461                                         char *buf)
462 {
463         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
464         acpi_battery_get_alarm(battery);
465         return sprintf(buf, "%d\n", battery->alarm_capacity *
466                                 acpi_battery_scale(battery) * 1000);
467 }
468
469 static ssize_t acpi_battery_alarm_store(struct device *dev,
470                                         struct device_attribute *attr,
471                                         const char *buf, size_t count)
472 {
473         unsigned long x;
474         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
475         if (sscanf(buf, "%lu\n", &x) == 1)
476                 battery->alarm_capacity = x /
477                         (1000 * acpi_battery_scale(battery));
478         if (battery->present)
479                 acpi_battery_set_alarm(battery);
480         return count;
481 }
482
483 static struct device_attribute alarm_attr = {
484         .attr = {.name = "alarm", .mode = 0644},
485         .show = acpi_battery_alarm_show,
486         .store = acpi_battery_alarm_store,
487 };
488
489 /* --------------------------------------------------------------------------
490                                  Driver Interface
491    -------------------------------------------------------------------------- */
492 static int acpi_battery_read(struct acpi_battery *battery)
493 {
494         int result = 0, saved_present = battery->present;
495         u16 state;
496
497         if (battery->sbs->manager_present) {
498                 result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
499                                 ACPI_SBS_MANAGER, 0x01, (u8 *)&state);
500                 if (!result)
501                         battery->present = state & (1 << battery->id);
502                 state &= 0x0fff;
503                 state |= 1 << (battery->id + 12);
504                 acpi_smbus_write(battery->sbs->hc, SMBUS_WRITE_WORD,
505                                   ACPI_SBS_MANAGER, 0x01, (u8 *)&state, 2);
506         } else if (battery->id == 0)
507                 battery->present = 1;
508
509         if (result || !battery->present)
510                 return result;
511
512         if (saved_present != battery->present) {
513                 battery->update_time = 0;
514                 result = acpi_battery_get_info(battery);
515                 if (result) {
516                         battery->present = 0;
517                         return result;
518                 }
519         }
520         result = acpi_battery_get_state(battery);
521         if (result)
522                 battery->present = 0;
523         return result;
524 }
525
526 /* Smart Battery */
527 static int acpi_battery_add(struct acpi_sbs *sbs, int id)
528 {
529         struct acpi_battery *battery = &sbs->battery[id];
530         struct power_supply_config psy_cfg = { .drv_data = battery, };
531         int result;
532
533         battery->id = id;
534         battery->sbs = sbs;
535         result = acpi_battery_read(battery);
536         if (result)
537                 return result;
538
539         sprintf(battery->name, ACPI_BATTERY_DIR_NAME, id);
540         battery->bat_desc.name = battery->name;
541         battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY;
542         if (!acpi_battery_mode(battery)) {
543                 battery->bat_desc.properties = sbs_charge_battery_props;
544                 battery->bat_desc.num_properties =
545                     ARRAY_SIZE(sbs_charge_battery_props);
546         } else {
547                 battery->bat_desc.properties = sbs_energy_battery_props;
548                 battery->bat_desc.num_properties =
549                     ARRAY_SIZE(sbs_energy_battery_props);
550         }
551         battery->bat_desc.get_property = acpi_sbs_battery_get_property;
552         battery->bat = power_supply_register(&sbs->device->dev,
553                                         &battery->bat_desc, &psy_cfg);
554         if (IS_ERR(battery->bat)) {
555                 result = PTR_ERR(battery->bat);
556                 battery->bat = NULL;
557                 goto end;
558         }
559
560         result = device_create_file(&battery->bat->dev, &alarm_attr);
561         if (result)
562                 goto end;
563         battery->have_sysfs_alarm = 1;
564       end:
565         printk(KERN_INFO PREFIX "%s [%s]: Battery Slot [%s] (battery %s)\n",
566                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
567                battery->name, battery->present ? "present" : "absent");
568         return result;
569 }
570
571 static void acpi_battery_remove(struct acpi_sbs *sbs, int id)
572 {
573         struct acpi_battery *battery = &sbs->battery[id];
574
575         if (battery->bat) {
576                 if (battery->have_sysfs_alarm)
577                         device_remove_file(&battery->bat->dev, &alarm_attr);
578                 power_supply_unregister(battery->bat);
579         }
580 }
581
582 static int acpi_charger_add(struct acpi_sbs *sbs)
583 {
584         int result;
585         struct power_supply_config psy_cfg = { .drv_data = sbs, };
586
587         result = acpi_ac_get_present(sbs);
588         if (result)
589                 goto end;
590
591         sbs->charger_exists = 1;
592         sbs->charger = power_supply_register(&sbs->device->dev,
593                                         &acpi_sbs_charger_desc, &psy_cfg);
594         if (IS_ERR(sbs->charger)) {
595                 result = PTR_ERR(sbs->charger);
596                 sbs->charger = NULL;
597         }
598         printk(KERN_INFO PREFIX "%s [%s]: AC Adapter [%s] (%s)\n",
599                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
600                ACPI_AC_DIR_NAME, sbs->charger_present ? "on-line" : "off-line");
601       end:
602         return result;
603 }
604
605 static void acpi_charger_remove(struct acpi_sbs *sbs)
606 {
607         if (sbs->charger)
608                 power_supply_unregister(sbs->charger);
609 }
610
611 static void acpi_sbs_callback(void *context)
612 {
613         int id;
614         struct acpi_sbs *sbs = context;
615         struct acpi_battery *bat;
616         u8 saved_charger_state = sbs->charger_present;
617         u8 saved_battery_state;
618
619         if (sbs->charger_exists) {
620                 acpi_ac_get_present(sbs);
621                 if (sbs->charger_present != saved_charger_state)
622                         kobject_uevent(&sbs->charger->dev.kobj, KOBJ_CHANGE);
623         }
624
625         if (sbs->manager_present) {
626                 for (id = 0; id < MAX_SBS_BAT; ++id) {
627                         if (!(sbs->batteries_supported & (1 << id)))
628                                 continue;
629                         bat = &sbs->battery[id];
630                         saved_battery_state = bat->present;
631                         acpi_battery_read(bat);
632                         if (saved_battery_state == bat->present)
633                                 continue;
634                         kobject_uevent(&bat->bat->dev.kobj, KOBJ_CHANGE);
635                 }
636         }
637 }
638
639 static int disable_sbs_manager(const struct dmi_system_id *d)
640 {
641         sbs_manager_broken = true;
642         return 0;
643 }
644
645 static struct dmi_system_id acpi_sbs_dmi_table[] = {
646         {
647                 .callback = disable_sbs_manager,
648                 .ident = "Apple",
649                 .matches = {
650                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc.")
651                 },
652         },
653         { },
654 };
655
656 static int acpi_sbs_add(struct acpi_device *device)
657 {
658         struct acpi_sbs *sbs;
659         int result = 0;
660         int id;
661
662         dmi_check_system(acpi_sbs_dmi_table);
663
664         sbs = kzalloc(sizeof(struct acpi_sbs), GFP_KERNEL);
665         if (!sbs) {
666                 result = -ENOMEM;
667                 goto end;
668         }
669
670         mutex_init(&sbs->lock);
671
672         sbs->hc = acpi_driver_data(device->parent);
673         sbs->device = device;
674         strcpy(acpi_device_name(device), ACPI_SBS_DEVICE_NAME);
675         strcpy(acpi_device_class(device), ACPI_SBS_CLASS);
676         device->driver_data = sbs;
677
678         result = acpi_charger_add(sbs);
679         if (result && result != -ENODEV)
680                 goto end;
681
682         result = 0;
683
684         if (!sbs_manager_broken) {
685                 result = acpi_manager_get_info(sbs);
686                 if (!result) {
687                         sbs->manager_present = 1;
688                         for (id = 0; id < MAX_SBS_BAT; ++id)
689                                 if ((sbs->batteries_supported & (1 << id)))
690                                         acpi_battery_add(sbs, id);
691                 }
692         }
693
694         if (!sbs->manager_present)
695                 acpi_battery_add(sbs, 0);
696
697         acpi_smbus_register_callback(sbs->hc, acpi_sbs_callback, sbs);
698       end:
699         if (result)
700                 acpi_sbs_remove(device);
701         return result;
702 }
703
704 static int acpi_sbs_remove(struct acpi_device *device)
705 {
706         struct acpi_sbs *sbs;
707         int id;
708
709         if (!device)
710                 return -EINVAL;
711         sbs = acpi_driver_data(device);
712         if (!sbs)
713                 return -EINVAL;
714         mutex_lock(&sbs->lock);
715         acpi_smbus_unregister_callback(sbs->hc);
716         for (id = 0; id < MAX_SBS_BAT; ++id)
717                 acpi_battery_remove(sbs, id);
718         acpi_charger_remove(sbs);
719         mutex_unlock(&sbs->lock);
720         mutex_destroy(&sbs->lock);
721         kfree(sbs);
722         return 0;
723 }
724
725 #ifdef CONFIG_PM_SLEEP
726 static int acpi_sbs_resume(struct device *dev)
727 {
728         struct acpi_sbs *sbs;
729         if (!dev)
730                 return -EINVAL;
731         sbs = to_acpi_device(dev)->driver_data;
732         acpi_sbs_callback(sbs);
733         return 0;
734 }
735 #else
736 #define acpi_sbs_resume NULL
737 #endif
738
739 static SIMPLE_DEV_PM_OPS(acpi_sbs_pm, NULL, acpi_sbs_resume);
740
741 static struct acpi_driver acpi_sbs_driver = {
742         .name = "sbs",
743         .class = ACPI_SBS_CLASS,
744         .ids = sbs_device_ids,
745         .ops = {
746                 .add = acpi_sbs_add,
747                 .remove = acpi_sbs_remove,
748                 },
749         .drv.pm = &acpi_sbs_pm,
750 };
751
752 static int __init acpi_sbs_init(void)
753 {
754         int result = 0;
755
756         if (acpi_disabled)
757                 return -ENODEV;
758
759         result = acpi_bus_register_driver(&acpi_sbs_driver);
760         if (result < 0)
761                 return -ENODEV;
762
763         return 0;
764 }
765
766 static void __exit acpi_sbs_exit(void)
767 {
768         acpi_bus_unregister_driver(&acpi_sbs_driver);
769         return;
770 }
771
772 module_init(acpi_sbs_init);
773 module_exit(acpi_sbs_exit);