Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18

Linux/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  *  You should have received a copy of the GNU General Public License along
 21  *  with this program; if not, write to the Free Software Foundation, Inc.,
 22  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 23  *
 24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 25  */
 26 
 27 #include <linux/init.h>
 28 #include <linux/slab.h>
 29 #include <linux/module.h>
 30 #include <linux/moduleparam.h>
 31 #include <linux/kernel.h>
 32 
 33 #include <linux/acpi.h>
 34 #include <linux/timer.h>
 35 #include <linux/jiffies.h>
 36 #include <linux/delay.h>
 37 #include <linux/power_supply.h>
 38 #include <linux/dmi.h>
 39 
 40 #include "sbshc.h"
 41 #include "battery.h"
 42 
 43 #define PREFIX "ACPI: "
 44 
 45 #define ACPI_SBS_CLASS                  "sbs"
 46 #define ACPI_AC_CLASS                   "ac_adapter"
 47 #define ACPI_SBS_DEVICE_NAME            "Smart Battery System"
 48 #define ACPI_SBS_FILE_INFO              "info"
 49 #define ACPI_SBS_FILE_STATE             "state"
 50 #define ACPI_SBS_FILE_ALARM             "alarm"
 51 #define ACPI_BATTERY_DIR_NAME           "BAT%i"
 52 #define ACPI_AC_DIR_NAME                "AC0"
 53 
 54 #define ACPI_SBS_NOTIFY_STATUS          0x80
 55 #define ACPI_SBS_NOTIFY_INFO            0x81
 56 
 57 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
 58 MODULE_DESCRIPTION("Smart Battery System ACPI interface driver");
 59 MODULE_LICENSE("GPL");
 60 
 61 static unsigned int cache_time = 1000;
 62 module_param(cache_time, uint, 0644);
 63 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
 64 
 65 static bool sbs_manager_broken;
 66 
 67 #define MAX_SBS_BAT                     4
 68 #define ACPI_SBS_BLOCK_MAX              32
 69 
 70 static const struct acpi_device_id sbs_device_ids[] = {
 71         {"ACPI0002", 0},
 72         {"", 0},
 73 };
 74 MODULE_DEVICE_TABLE(acpi, sbs_device_ids);
 75 
 76 struct acpi_battery {
 77         struct power_supply bat;
 78         struct acpi_sbs *sbs;
 79         unsigned long update_time;
 80         char name[8];
 81         char manufacturer_name[ACPI_SBS_BLOCK_MAX];
 82         char device_name[ACPI_SBS_BLOCK_MAX];
 83         char device_chemistry[ACPI_SBS_BLOCK_MAX];
 84         u16 alarm_capacity;
 85         u16 full_charge_capacity;
 86         u16 design_capacity;
 87         u16 design_voltage;
 88         u16 serial_number;
 89         u16 cycle_count;
 90         u16 temp_now;
 91         u16 voltage_now;
 92         s16 rate_now;
 93         s16 rate_avg;
 94         u16 capacity_now;
 95         u16 state_of_charge;
 96         u16 state;
 97         u16 mode;
 98         u16 spec;
 99         u8 id;
100         u8 present:1;
101         u8 have_sysfs_alarm:1;
102 };
103 
104 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat)
105 
106 struct acpi_sbs {
107         struct power_supply charger;
108         struct acpi_device *device;
109         struct acpi_smb_hc *hc;
110         struct mutex lock;
111         struct acpi_battery battery[MAX_SBS_BAT];
112         u8 batteries_supported:4;
113         u8 manager_present:1;
114         u8 charger_present:1;
115         u8 charger_exists:1;
116 };
117 
118 #define to_acpi_sbs(x) container_of(x, struct acpi_sbs, charger)
119 
120 static int acpi_sbs_remove(struct acpi_device *device);
121 static int acpi_battery_get_state(struct acpi_battery *battery);
122 
123 static inline int battery_scale(int log)
124 {
125         int scale = 1;
126         while (log--)
127                 scale *= 10;
128         return scale;
129 }
130 
131 static inline int acpi_battery_vscale(struct acpi_battery *battery)
132 {
133         return battery_scale((battery->spec & 0x0f00) >> 8);
134 }
135 
136 static inline int acpi_battery_ipscale(struct acpi_battery *battery)
137 {
138         return battery_scale((battery->spec & 0xf000) >> 12);
139 }
140 
141 static inline int acpi_battery_mode(struct acpi_battery *battery)
142 {
143         return (battery->mode & 0x8000);
144 }
145 
146 static inline int acpi_battery_scale(struct acpi_battery *battery)
147 {
148         return (acpi_battery_mode(battery) ? 10 : 1) *
149             acpi_battery_ipscale(battery);
150 }
151 
152 static int sbs_get_ac_property(struct power_supply *psy,
153                                enum power_supply_property psp,
154                                union power_supply_propval *val)
155 {
156         struct acpi_sbs *sbs = to_acpi_sbs(psy);
157         switch (psp) {
158         case POWER_SUPPLY_PROP_ONLINE:
159                 val->intval = sbs->charger_present;
160                 break;
161         default:
162                 return -EINVAL;
163         }
164         return 0;
165 }
166 
167 static int acpi_battery_technology(struct acpi_battery *battery)
168 {
169         if (!strcasecmp("NiCd", battery->device_chemistry))
170                 return POWER_SUPPLY_TECHNOLOGY_NiCd;
171         if (!strcasecmp("NiMH", battery->device_chemistry))
172                 return POWER_SUPPLY_TECHNOLOGY_NiMH;
173         if (!strcasecmp("LION", battery->device_chemistry))
174                 return POWER_SUPPLY_TECHNOLOGY_LION;
175         if (!strcasecmp("LiP", battery->device_chemistry))
176                 return POWER_SUPPLY_TECHNOLOGY_LIPO;
177         return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
178 }
179 
180 static int acpi_sbs_battery_get_property(struct power_supply *psy,
181                                          enum power_supply_property psp,
182                                          union power_supply_propval *val)
183 {
184         struct acpi_battery *battery = to_acpi_battery(psy);
185 
186         if ((!battery->present) && psp != POWER_SUPPLY_PROP_PRESENT)
187                 return -ENODEV;
188 
189         acpi_battery_get_state(battery);
190         switch (psp) {
191         case POWER_SUPPLY_PROP_STATUS:
192                 if (battery->rate_now < 0)
193                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
194                 else if (battery->rate_now > 0)
195                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
196                 else
197                         val->intval = POWER_SUPPLY_STATUS_FULL;
198                 break;
199         case POWER_SUPPLY_PROP_PRESENT:
200                 val->intval = battery->present;
201                 break;
202         case POWER_SUPPLY_PROP_TECHNOLOGY:
203                 val->intval = acpi_battery_technology(battery);
204                 break;
205         case POWER_SUPPLY_PROP_CYCLE_COUNT:
206                 val->intval = battery->cycle_count;
207                 break;
208         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
209                 val->intval = battery->design_voltage *
210                         acpi_battery_vscale(battery) * 1000;
211                 break;
212         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
213                 val->intval = battery->voltage_now *
214                                 acpi_battery_vscale(battery) * 1000;
215                 break;
216         case POWER_SUPPLY_PROP_CURRENT_NOW:
217         case POWER_SUPPLY_PROP_POWER_NOW:
218                 val->intval = abs(battery->rate_now) *
219                                 acpi_battery_ipscale(battery) * 1000;
220                 val->intval *= (acpi_battery_mode(battery)) ?
221                                 (battery->voltage_now *
222                                 acpi_battery_vscale(battery) / 1000) : 1;
223                 break;
224         case POWER_SUPPLY_PROP_CURRENT_AVG:
225         case POWER_SUPPLY_PROP_POWER_AVG:
226                 val->intval = abs(battery->rate_avg) *
227                                 acpi_battery_ipscale(battery) * 1000;
228                 val->intval *= (acpi_battery_mode(battery)) ?
229                                 (battery->voltage_now *
230                                 acpi_battery_vscale(battery) / 1000) : 1;
231                 break;
232         case POWER_SUPPLY_PROP_CAPACITY:
233                 val->intval = battery->state_of_charge;
234                 break;
235         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
236         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
237                 val->intval = battery->design_capacity *
238                         acpi_battery_scale(battery) * 1000;
239                 break;
240         case POWER_SUPPLY_PROP_CHARGE_FULL:
241         case POWER_SUPPLY_PROP_ENERGY_FULL:
242                 val->intval = battery->full_charge_capacity *
243                         acpi_battery_scale(battery) * 1000;
244                 break;
245         case POWER_SUPPLY_PROP_CHARGE_NOW:
246         case POWER_SUPPLY_PROP_ENERGY_NOW:
247                 val->intval = battery->capacity_now *
248                                 acpi_battery_scale(battery) * 1000;
249                 break;
250         case POWER_SUPPLY_PROP_TEMP:
251                 val->intval = battery->temp_now - 2730; // dK -> dC
252                 break;
253         case POWER_SUPPLY_PROP_MODEL_NAME:
254                 val->strval = battery->device_name;
255                 break;
256         case POWER_SUPPLY_PROP_MANUFACTURER:
257                 val->strval = battery->manufacturer_name;
258                 break;
259         default:
260                 return -EINVAL;
261         }
262         return 0;
263 }
264 
265 static enum power_supply_property sbs_ac_props[] = {
266         POWER_SUPPLY_PROP_ONLINE,
267 };
268 
269 static enum power_supply_property sbs_charge_battery_props[] = {
270         POWER_SUPPLY_PROP_STATUS,
271         POWER_SUPPLY_PROP_PRESENT,
272         POWER_SUPPLY_PROP_TECHNOLOGY,
273         POWER_SUPPLY_PROP_CYCLE_COUNT,
274         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
275         POWER_SUPPLY_PROP_VOLTAGE_NOW,
276         POWER_SUPPLY_PROP_CURRENT_NOW,
277         POWER_SUPPLY_PROP_CURRENT_AVG,
278         POWER_SUPPLY_PROP_CAPACITY,
279         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
280         POWER_SUPPLY_PROP_CHARGE_FULL,
281         POWER_SUPPLY_PROP_CHARGE_NOW,
282         POWER_SUPPLY_PROP_TEMP,
283         POWER_SUPPLY_PROP_MODEL_NAME,
284         POWER_SUPPLY_PROP_MANUFACTURER,
285 };
286 
287 static enum power_supply_property sbs_energy_battery_props[] = {
288         POWER_SUPPLY_PROP_STATUS,
289         POWER_SUPPLY_PROP_PRESENT,
290         POWER_SUPPLY_PROP_TECHNOLOGY,
291         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
292         POWER_SUPPLY_PROP_VOLTAGE_NOW,
293         POWER_SUPPLY_PROP_CURRENT_NOW,
294         POWER_SUPPLY_PROP_CURRENT_AVG,
295         POWER_SUPPLY_PROP_POWER_NOW,
296         POWER_SUPPLY_PROP_POWER_AVG,
297         POWER_SUPPLY_PROP_CAPACITY,
298         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
299         POWER_SUPPLY_PROP_ENERGY_FULL,
300         POWER_SUPPLY_PROP_ENERGY_NOW,
301         POWER_SUPPLY_PROP_TEMP,
302         POWER_SUPPLY_PROP_MODEL_NAME,
303         POWER_SUPPLY_PROP_MANUFACTURER,
304 };
305 
306 
307 /* --------------------------------------------------------------------------
308                             Smart Battery System Management
309    -------------------------------------------------------------------------- */
310 
311 struct acpi_battery_reader {
312         u8 command;             /* command for battery */
313         u8 mode;                /* word or block? */
314         size_t offset;          /* offset inside struct acpi_sbs_battery */
315 };
316 
317 static struct acpi_battery_reader info_readers[] = {
318         {0x01, SMBUS_READ_WORD, offsetof(struct acpi_battery, alarm_capacity)},
319         {0x03, SMBUS_READ_WORD, offsetof(struct acpi_battery, mode)},
320         {0x10, SMBUS_READ_WORD, offsetof(struct acpi_battery, full_charge_capacity)},
321         {0x17, SMBUS_READ_WORD, offsetof(struct acpi_battery, cycle_count)},
322         {0x18, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_capacity)},
323         {0x19, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_voltage)},
324         {0x1a, SMBUS_READ_WORD, offsetof(struct acpi_battery, spec)},
325         {0x1c, SMBUS_READ_WORD, offsetof(struct acpi_battery, serial_number)},
326         {0x20, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, manufacturer_name)},
327         {0x21, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_name)},
328         {0x22, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_chemistry)},
329 };
330 
331 static struct acpi_battery_reader state_readers[] = {
332         {0x08, SMBUS_READ_WORD, offsetof(struct acpi_battery, temp_now)},
333         {0x09, SMBUS_READ_WORD, offsetof(struct acpi_battery, voltage_now)},
334         {0x0a, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_now)},
335         {0x0b, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_avg)},
336         {0x0f, SMBUS_READ_WORD, offsetof(struct acpi_battery, capacity_now)},
337         {0x0e, SMBUS_READ_WORD, offsetof(struct acpi_battery, state_of_charge)},
338         {0x16, SMBUS_READ_WORD, offsetof(struct acpi_battery, state)},
339 };
340 
341 static int acpi_manager_get_info(struct acpi_sbs *sbs)
342 {
343         int result = 0;
344         u16 battery_system_info;
345 
346         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
347                                  0x04, (u8 *)&battery_system_info);
348         if (!result)
349                 sbs->batteries_supported = battery_system_info & 0x000f;
350         return result;
351 }
352 
353 static int acpi_battery_get_info(struct acpi_battery *battery)
354 {
355         int i, result = 0;
356 
357         for (i = 0; i < ARRAY_SIZE(info_readers); ++i) {
358                 result = acpi_smbus_read(battery->sbs->hc,
359                                          info_readers[i].mode,
360                                          ACPI_SBS_BATTERY,
361                                          info_readers[i].command,
362                                          (u8 *) battery +
363                                                 info_readers[i].offset);
364                 if (result)
365                         break;
366         }
367         return result;
368 }
369 
370 static int acpi_battery_get_state(struct acpi_battery *battery)
371 {
372         int i, result = 0;
373 
374         if (battery->update_time &&
375             time_before(jiffies, battery->update_time +
376                                 msecs_to_jiffies(cache_time)))
377                 return 0;
378         for (i = 0; i < ARRAY_SIZE(state_readers); ++i) {
379                 result = acpi_smbus_read(battery->sbs->hc,
380                                          state_readers[i].mode,
381                                          ACPI_SBS_BATTERY,
382                                          state_readers[i].command,
383                                          (u8 *)battery +
384                                                 state_readers[i].offset);
385                 if (result)
386                         goto end;
387         }
388       end:
389         battery->update_time = jiffies;
390         return result;
391 }
392 
393 static int acpi_battery_get_alarm(struct acpi_battery *battery)
394 {
395         return acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
396                                  ACPI_SBS_BATTERY, 0x01,
397                                  (u8 *)&battery->alarm_capacity);
398 }
399 
400 static int acpi_battery_set_alarm(struct acpi_battery *battery)
401 {
402         struct acpi_sbs *sbs = battery->sbs;
403         u16 value, sel = 1 << (battery->id + 12);
404 
405         int ret;
406 
407 
408         if (sbs->manager_present) {
409                 ret = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
410                                 0x01, (u8 *)&value);
411                 if (ret)
412                         goto end;
413                 if ((value & 0xf000) != sel) {
414                         value &= 0x0fff;
415                         value |= sel;
416                 ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD,
417                                          ACPI_SBS_MANAGER,
418                                          0x01, (u8 *)&value, 2);
419                 if (ret)
420                         goto end;
421                 }
422         }
423         ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD, ACPI_SBS_BATTERY,
424                                 0x01, (u8 *)&battery->alarm_capacity, 2);
425       end:
426         return ret;
427 }
428 
429 static int acpi_ac_get_present(struct acpi_sbs *sbs)
430 {
431         int result;
432         u16 status;
433 
434         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_CHARGER,
435                                  0x13, (u8 *) & status);
436 
437         if (result)
438                 return result;
439 
440         /*
441          * The spec requires that bit 4 always be 1. If it's not set, assume
442          * that the implementation doesn't support an SBS charger
443          */
444         if (!((status >> 4) & 0x1))
445                 return -ENODEV;
446 
447         sbs->charger_present = (status >> 15) & 0x1;
448         return 0;
449 }
450 
451 static ssize_t acpi_battery_alarm_show(struct device *dev,
452                                         struct device_attribute *attr,
453                                         char *buf)
454 {
455         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
456         acpi_battery_get_alarm(battery);
457         return sprintf(buf, "%d\n", battery->alarm_capacity *
458                                 acpi_battery_scale(battery) * 1000);
459 }
460 
461 static ssize_t acpi_battery_alarm_store(struct device *dev,
462                                         struct device_attribute *attr,
463                                         const char *buf, size_t count)
464 {
465         unsigned long x;
466         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
467         if (sscanf(buf, "%lu\n", &x) == 1)
468                 battery->alarm_capacity = x /
469                         (1000 * acpi_battery_scale(battery));
470         if (battery->present)
471                 acpi_battery_set_alarm(battery);
472         return count;
473 }
474 
475 static struct device_attribute alarm_attr = {
476         .attr = {.name = "alarm", .mode = 0644},
477         .show = acpi_battery_alarm_show,
478         .store = acpi_battery_alarm_store,
479 };
480 
481 /* --------------------------------------------------------------------------
482                                  Driver Interface
483    -------------------------------------------------------------------------- */
484 static int acpi_battery_read(struct acpi_battery *battery)
485 {
486         int result = 0, saved_present = battery->present;
487         u16 state;
488 
489         if (battery->sbs->manager_present) {
490                 result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
491                                 ACPI_SBS_MANAGER, 0x01, (u8 *)&state);
492                 if (!result)
493                         battery->present = state & (1 << battery->id);
494                 state &= 0x0fff;
495                 state |= 1 << (battery->id + 12);
496                 acpi_smbus_write(battery->sbs->hc, SMBUS_WRITE_WORD,
497                                   ACPI_SBS_MANAGER, 0x01, (u8 *)&state, 2);
498         } else if (battery->id == 0)
499                 battery->present = 1;
500 
501         if (result || !battery->present)
502                 return result;
503 
504         if (saved_present != battery->present) {
505                 battery->update_time = 0;
506                 result = acpi_battery_get_info(battery);
507                 if (result) {
508                         battery->present = 0;
509                         return result;
510                 }
511         }
512         result = acpi_battery_get_state(battery);
513         if (result)
514                 battery->present = 0;
515         return result;
516 }
517 
518 /* Smart Battery */
519 static int acpi_battery_add(struct acpi_sbs *sbs, int id)
520 {
521         struct acpi_battery *battery = &sbs->battery[id];
522         int result;
523 
524         battery->id = id;
525         battery->sbs = sbs;
526         result = acpi_battery_read(battery);
527         if (result)
528                 return result;
529 
530         sprintf(battery->name, ACPI_BATTERY_DIR_NAME, id);
531         battery->bat.name = battery->name;
532         battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
533         if (!acpi_battery_mode(battery)) {
534                 battery->bat.properties = sbs_charge_battery_props;
535                 battery->bat.num_properties =
536                     ARRAY_SIZE(sbs_charge_battery_props);
537         } else {
538                 battery->bat.properties = sbs_energy_battery_props;
539                 battery->bat.num_properties =
540                     ARRAY_SIZE(sbs_energy_battery_props);
541         }
542         battery->bat.get_property = acpi_sbs_battery_get_property;
543         result = power_supply_register(&sbs->device->dev, &battery->bat);
544         if (result)
545                 goto end;
546 
547         result = device_create_file(battery->bat.dev, &alarm_attr);
548         if (result)
549                 goto end;
550         battery->have_sysfs_alarm = 1;
551       end:
552         printk(KERN_INFO PREFIX "%s [%s]: Battery Slot [%s] (battery %s)\n",
553                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
554                battery->name, battery->present ? "present" : "absent");
555         return result;
556 }
557 
558 static void acpi_battery_remove(struct acpi_sbs *sbs, int id)
559 {
560         struct acpi_battery *battery = &sbs->battery[id];
561 
562         if (battery->bat.dev) {
563                 if (battery->have_sysfs_alarm)
564                         device_remove_file(battery->bat.dev, &alarm_attr);
565                 power_supply_unregister(&battery->bat);
566         }
567 }
568 
569 static int acpi_charger_add(struct acpi_sbs *sbs)
570 {
571         int result;
572 
573         result = acpi_ac_get_present(sbs);
574         if (result)
575                 goto end;
576 
577         sbs->charger_exists = 1;
578         sbs->charger.name = "sbs-charger";
579         sbs->charger.type = POWER_SUPPLY_TYPE_MAINS;
580         sbs->charger.properties = sbs_ac_props;
581         sbs->charger.num_properties = ARRAY_SIZE(sbs_ac_props);
582         sbs->charger.get_property = sbs_get_ac_property;
583         power_supply_register(&sbs->device->dev, &sbs->charger);
584         printk(KERN_INFO PREFIX "%s [%s]: AC Adapter [%s] (%s)\n",
585                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
586                ACPI_AC_DIR_NAME, sbs->charger_present ? "on-line" : "off-line");
587       end:
588         return result;
589 }
590 
591 static void acpi_charger_remove(struct acpi_sbs *sbs)
592 {
593         if (sbs->charger.dev)
594                 power_supply_unregister(&sbs->charger);
595 }
596 
597 static void acpi_sbs_callback(void *context)
598 {
599         int id;
600         struct acpi_sbs *sbs = context;
601         struct acpi_battery *bat;
602         u8 saved_charger_state = sbs->charger_present;
603         u8 saved_battery_state;
604 
605         if (sbs->charger_exists) {
606                 acpi_ac_get_present(sbs);
607                 if (sbs->charger_present != saved_charger_state)
608                         kobject_uevent(&sbs->charger.dev->kobj, KOBJ_CHANGE);
609         }
610 
611         if (sbs->manager_present) {
612                 for (id = 0; id < MAX_SBS_BAT; ++id) {
613                         if (!(sbs->batteries_supported & (1 << id)))
614                                 continue;
615                         bat = &sbs->battery[id];
616                         saved_battery_state = bat->present;
617                         acpi_battery_read(bat);
618                         if (saved_battery_state == bat->present)
619                                 continue;
620                         kobject_uevent(&bat->bat.dev->kobj, KOBJ_CHANGE);
621                 }
622         }
623 }
624 
625 static int disable_sbs_manager(const struct dmi_system_id *d)
626 {
627         sbs_manager_broken = true;
628         return 0;
629 }
630 
631 static struct dmi_system_id acpi_sbs_dmi_table[] = {
632         {
633                 .callback = disable_sbs_manager,
634                 .ident = "Apple",
635                 .matches = {
636                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc.")
637                 },
638         },
639         { },
640 };
641 
642 static int acpi_sbs_add(struct acpi_device *device)
643 {
644         struct acpi_sbs *sbs;
645         int result = 0;
646         int id;
647 
648         dmi_check_system(acpi_sbs_dmi_table);
649 
650         sbs = kzalloc(sizeof(struct acpi_sbs), GFP_KERNEL);
651         if (!sbs) {
652                 result = -ENOMEM;
653                 goto end;
654         }
655 
656         mutex_init(&sbs->lock);
657 
658         sbs->hc = acpi_driver_data(device->parent);
659         sbs->device = device;
660         strcpy(acpi_device_name(device), ACPI_SBS_DEVICE_NAME);
661         strcpy(acpi_device_class(device), ACPI_SBS_CLASS);
662         device->driver_data = sbs;
663 
664         result = acpi_charger_add(sbs);
665         if (result && result != -ENODEV)
666                 goto end;
667 
668         result = 0;
669 
670         if (!sbs_manager_broken) {
671                 result = acpi_manager_get_info(sbs);
672                 if (!result) {
673                         sbs->manager_present = 0;
674                         for (id = 0; id < MAX_SBS_BAT; ++id)
675                                 if ((sbs->batteries_supported & (1 << id)))
676                                         acpi_battery_add(sbs, id);
677                 }
678         }
679 
680         if (!sbs->manager_present)
681                 acpi_battery_add(sbs, 0);
682 
683         acpi_smbus_register_callback(sbs->hc, acpi_sbs_callback, sbs);
684       end:
685         if (result)
686                 acpi_sbs_remove(device);
687         return result;
688 }
689 
690 static int acpi_sbs_remove(struct acpi_device *device)
691 {
692         struct acpi_sbs *sbs;
693         int id;
694 
695         if (!device)
696                 return -EINVAL;
697         sbs = acpi_driver_data(device);
698         if (!sbs)
699                 return -EINVAL;
700         mutex_lock(&sbs->lock);
701         acpi_smbus_unregister_callback(sbs->hc);
702         for (id = 0; id < MAX_SBS_BAT; ++id)
703                 acpi_battery_remove(sbs, id);
704         acpi_charger_remove(sbs);
705         mutex_unlock(&sbs->lock);
706         mutex_destroy(&sbs->lock);
707         kfree(sbs);
708         return 0;
709 }
710 
711 #ifdef CONFIG_PM_SLEEP
712 static int acpi_sbs_resume(struct device *dev)
713 {
714         struct acpi_sbs *sbs;
715         if (!dev)
716                 return -EINVAL;
717         sbs = to_acpi_device(dev)->driver_data;
718         acpi_sbs_callback(sbs);
719         return 0;
720 }
721 #else
722 #define acpi_sbs_resume NULL
723 #endif
724 
725 static SIMPLE_DEV_PM_OPS(acpi_sbs_pm, NULL, acpi_sbs_resume);
726 
727 static struct acpi_driver acpi_sbs_driver = {
728         .name = "sbs",
729         .class = ACPI_SBS_CLASS,
730         .ids = sbs_device_ids,
731         .ops = {
732                 .add = acpi_sbs_add,
733                 .remove = acpi_sbs_remove,
734                 },
735         .drv.pm = &acpi_sbs_pm,
736 };
737 
738 static int __init acpi_sbs_init(void)
739 {
740         int result = 0;
741 
742         if (acpi_disabled)
743                 return -ENODEV;
744 
745         result = acpi_bus_register_driver(&acpi_sbs_driver);
746         if (result < 0)
747                 return -ENODEV;
748 
749         return 0;
750 }
751 
752 static void __exit acpi_sbs_exit(void)
753 {
754         acpi_bus_unregister_driver(&acpi_sbs_driver);
755         return;
756 }
757 
758 module_init(acpi_sbs_init);
759 module_exit(acpi_sbs_exit);
760 

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