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/platform_data/x86/apple.h>
35#include <acpi/battery.h>
36
37#include "sbshc.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
53MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
54MODULE_DESCRIPTION("Smart Battery System ACPI interface driver");
55MODULE_LICENSE("GPL");
56
57static unsigned int cache_time = 1000;
58module_param(cache_time, uint, 0644);
59MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
60
61#define MAX_SBS_BAT 4
62#define ACPI_SBS_BLOCK_MAX 32
63
64static const struct acpi_device_id sbs_device_ids[] = {
65 {"ACPI0002", 0},
66 {"", 0},
67};
68MODULE_DEVICE_TABLE(acpi, sbs_device_ids);
69
70struct acpi_battery {
71 struct power_supply *bat;
72 struct power_supply_desc bat_desc;
73 struct acpi_sbs *sbs;
74 unsigned long update_time;
75 char name[8];
76 char manufacturer_name[ACPI_SBS_BLOCK_MAX];
77 char device_name[ACPI_SBS_BLOCK_MAX];
78 char device_chemistry[ACPI_SBS_BLOCK_MAX];
79 u16 alarm_capacity;
80 u16 full_charge_capacity;
81 u16 design_capacity;
82 u16 design_voltage;
83 u16 serial_number;
84 u16 cycle_count;
85 u16 temp_now;
86 u16 voltage_now;
87 s16 rate_now;
88 s16 rate_avg;
89 u16 capacity_now;
90 u16 state_of_charge;
91 u16 state;
92 u16 mode;
93 u16 spec;
94 u8 id;
95 u8 present:1;
96 u8 have_sysfs_alarm:1;
97};
98
99#define to_acpi_battery(x) power_supply_get_drvdata(x)
100
101struct acpi_sbs {
102 struct power_supply *charger;
103 struct acpi_device *device;
104 struct acpi_smb_hc *hc;
105 struct mutex lock;
106 struct acpi_battery battery[MAX_SBS_BAT];
107 u8 batteries_supported:4;
108 u8 manager_present:1;
109 u8 charger_present:1;
110 u8 charger_exists:1;
111};
112
113#define to_acpi_sbs(x) power_supply_get_drvdata(x)
114
115static int acpi_sbs_remove(struct acpi_device *device);
116static int acpi_battery_get_state(struct acpi_battery *battery);
117
118static inline int battery_scale(int log)
119{
120 int scale = 1;
121 while (log--)
122 scale *= 10;
123 return scale;
124}
125
126static inline int acpi_battery_vscale(struct acpi_battery *battery)
127{
128 return battery_scale((battery->spec & 0x0f00) >> 8);
129}
130
131static inline int acpi_battery_ipscale(struct acpi_battery *battery)
132{
133 return battery_scale((battery->spec & 0xf000) >> 12);
134}
135
136static inline int acpi_battery_mode(struct acpi_battery *battery)
137{
138 return (battery->mode & 0x8000);
139}
140
141static inline int acpi_battery_scale(struct acpi_battery *battery)
142{
143 return (acpi_battery_mode(battery) ? 10 : 1) *
144 acpi_battery_ipscale(battery);
145}
146
147static int sbs_get_ac_property(struct power_supply *psy,
148 enum power_supply_property psp,
149 union power_supply_propval *val)
150{
151 struct acpi_sbs *sbs = to_acpi_sbs(psy);
152 switch (psp) {
153 case POWER_SUPPLY_PROP_ONLINE:
154 val->intval = sbs->charger_present;
155 break;
156 default:
157 return -EINVAL;
158 }
159 return 0;
160}
161
162static int acpi_battery_technology(struct acpi_battery *battery)
163{
164 if (!strcasecmp("NiCd", battery->device_chemistry))
165 return POWER_SUPPLY_TECHNOLOGY_NiCd;
166 if (!strcasecmp("NiMH", battery->device_chemistry))
167 return POWER_SUPPLY_TECHNOLOGY_NiMH;
168 if (!strcasecmp("LION", battery->device_chemistry))
169 return POWER_SUPPLY_TECHNOLOGY_LION;
170 if (!strcasecmp("LiP", battery->device_chemistry))
171 return POWER_SUPPLY_TECHNOLOGY_LIPO;
172 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
173}
174
175static int acpi_sbs_battery_get_property(struct power_supply *psy,
176 enum power_supply_property psp,
177 union power_supply_propval *val)
178{
179 struct acpi_battery *battery = to_acpi_battery(psy);
180
181 if ((!battery->present) && psp != POWER_SUPPLY_PROP_PRESENT)
182 return -ENODEV;
183
184 acpi_battery_get_state(battery);
185 switch (psp) {
186 case POWER_SUPPLY_PROP_STATUS:
187 if (battery->rate_now < 0)
188 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
189 else if (battery->rate_now > 0)
190 val->intval = POWER_SUPPLY_STATUS_CHARGING;
191 else
192 val->intval = POWER_SUPPLY_STATUS_FULL;
193 break;
194 case POWER_SUPPLY_PROP_PRESENT:
195 val->intval = battery->present;
196 break;
197 case POWER_SUPPLY_PROP_TECHNOLOGY:
198 val->intval = acpi_battery_technology(battery);
199 break;
200 case POWER_SUPPLY_PROP_CYCLE_COUNT:
201 val->intval = battery->cycle_count;
202 break;
203 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
204 val->intval = battery->design_voltage *
205 acpi_battery_vscale(battery) * 1000;
206 break;
207 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
208 val->intval = battery->voltage_now *
209 acpi_battery_vscale(battery) * 1000;
210 break;
211 case POWER_SUPPLY_PROP_CURRENT_NOW:
212 case POWER_SUPPLY_PROP_POWER_NOW:
213 val->intval = abs(battery->rate_now) *
214 acpi_battery_ipscale(battery) * 1000;
215 val->intval *= (acpi_battery_mode(battery)) ?
216 (battery->voltage_now *
217 acpi_battery_vscale(battery) / 1000) : 1;
218 break;
219 case POWER_SUPPLY_PROP_CURRENT_AVG:
220 case POWER_SUPPLY_PROP_POWER_AVG:
221 val->intval = abs(battery->rate_avg) *
222 acpi_battery_ipscale(battery) * 1000;
223 val->intval *= (acpi_battery_mode(battery)) ?
224 (battery->voltage_now *
225 acpi_battery_vscale(battery) / 1000) : 1;
226 break;
227 case POWER_SUPPLY_PROP_CAPACITY:
228 val->intval = battery->state_of_charge;
229 break;
230 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
231 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
232 val->intval = battery->design_capacity *
233 acpi_battery_scale(battery) * 1000;
234 break;
235 case POWER_SUPPLY_PROP_CHARGE_FULL:
236 case POWER_SUPPLY_PROP_ENERGY_FULL:
237 val->intval = battery->full_charge_capacity *
238 acpi_battery_scale(battery) * 1000;
239 break;
240 case POWER_SUPPLY_PROP_CHARGE_NOW:
241 case POWER_SUPPLY_PROP_ENERGY_NOW:
242 val->intval = battery->capacity_now *
243 acpi_battery_scale(battery) * 1000;
244 break;
245 case POWER_SUPPLY_PROP_TEMP:
246 val->intval = battery->temp_now - 2730; // dK -> dC
247 break;
248 case POWER_SUPPLY_PROP_MODEL_NAME:
249 val->strval = battery->device_name;
250 break;
251 case POWER_SUPPLY_PROP_MANUFACTURER:
252 val->strval = battery->manufacturer_name;
253 break;
254 default:
255 return -EINVAL;
256 }
257 return 0;
258}
259
260static enum power_supply_property sbs_ac_props[] = {
261 POWER_SUPPLY_PROP_ONLINE,
262};
263
264static enum power_supply_property sbs_charge_battery_props[] = {
265 POWER_SUPPLY_PROP_STATUS,
266 POWER_SUPPLY_PROP_PRESENT,
267 POWER_SUPPLY_PROP_TECHNOLOGY,
268 POWER_SUPPLY_PROP_CYCLE_COUNT,
269 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
270 POWER_SUPPLY_PROP_VOLTAGE_NOW,
271 POWER_SUPPLY_PROP_CURRENT_NOW,
272 POWER_SUPPLY_PROP_CURRENT_AVG,
273 POWER_SUPPLY_PROP_CAPACITY,
274 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
275 POWER_SUPPLY_PROP_CHARGE_FULL,
276 POWER_SUPPLY_PROP_CHARGE_NOW,
277 POWER_SUPPLY_PROP_TEMP,
278 POWER_SUPPLY_PROP_MODEL_NAME,
279 POWER_SUPPLY_PROP_MANUFACTURER,
280};
281
282static enum power_supply_property sbs_energy_battery_props[] = {
283 POWER_SUPPLY_PROP_STATUS,
284 POWER_SUPPLY_PROP_PRESENT,
285 POWER_SUPPLY_PROP_TECHNOLOGY,
286 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
287 POWER_SUPPLY_PROP_VOLTAGE_NOW,
288 POWER_SUPPLY_PROP_CURRENT_NOW,
289 POWER_SUPPLY_PROP_CURRENT_AVG,
290 POWER_SUPPLY_PROP_POWER_NOW,
291 POWER_SUPPLY_PROP_POWER_AVG,
292 POWER_SUPPLY_PROP_CAPACITY,
293 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
294 POWER_SUPPLY_PROP_ENERGY_FULL,
295 POWER_SUPPLY_PROP_ENERGY_NOW,
296 POWER_SUPPLY_PROP_TEMP,
297 POWER_SUPPLY_PROP_MODEL_NAME,
298 POWER_SUPPLY_PROP_MANUFACTURER,
299};
300
301static const struct power_supply_desc acpi_sbs_charger_desc = {
302 .name = "sbs-charger",
303 .type = POWER_SUPPLY_TYPE_MAINS,
304 .properties = sbs_ac_props,
305 .num_properties = ARRAY_SIZE(sbs_ac_props),
306 .get_property = sbs_get_ac_property,
307};
308
309/* --------------------------------------------------------------------------
310 Smart Battery System Management
311 -------------------------------------------------------------------------- */
312
313struct acpi_battery_reader {
314 u8 command; /* command for battery */
315 u8 mode; /* word or block? */
316 size_t offset; /* offset inside struct acpi_sbs_battery */
317};
318
319static struct acpi_battery_reader info_readers[] = {
320 {0x01, SMBUS_READ_WORD, offsetof(struct acpi_battery, alarm_capacity)},
321 {0x03, SMBUS_READ_WORD, offsetof(struct acpi_battery, mode)},
322 {0x10, SMBUS_READ_WORD, offsetof(struct acpi_battery, full_charge_capacity)},
323 {0x17, SMBUS_READ_WORD, offsetof(struct acpi_battery, cycle_count)},
324 {0x18, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_capacity)},
325 {0x19, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_voltage)},
326 {0x1a, SMBUS_READ_WORD, offsetof(struct acpi_battery, spec)},
327 {0x1c, SMBUS_READ_WORD, offsetof(struct acpi_battery, serial_number)},
328 {0x20, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, manufacturer_name)},
329 {0x21, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_name)},
330 {0x22, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_chemistry)},
331};
332
333static struct acpi_battery_reader state_readers[] = {
334 {0x08, SMBUS_READ_WORD, offsetof(struct acpi_battery, temp_now)},
335 {0x09, SMBUS_READ_WORD, offsetof(struct acpi_battery, voltage_now)},
336 {0x0a, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_now)},
337 {0x0b, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_avg)},
338 {0x0f, SMBUS_READ_WORD, offsetof(struct acpi_battery, capacity_now)},
339 {0x0e, SMBUS_READ_WORD, offsetof(struct acpi_battery, state_of_charge)},
340 {0x16, SMBUS_READ_WORD, offsetof(struct acpi_battery, state)},
341};
342
343static int acpi_manager_get_info(struct acpi_sbs *sbs)
344{
345 int result = 0;
346 u16 battery_system_info;
347
348 result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
349 0x04, (u8 *)&battery_system_info);
350 if (!result)
351 sbs->batteries_supported = battery_system_info & 0x000f;
352 return result;
353}
354
355static int acpi_battery_get_info(struct acpi_battery *battery)
356{
357 int i, result = 0;
358
359 for (i = 0; i < ARRAY_SIZE(info_readers); ++i) {
360 result = acpi_smbus_read(battery->sbs->hc,
361 info_readers[i].mode,
362 ACPI_SBS_BATTERY,
363 info_readers[i].command,
364 (u8 *) battery +
365 info_readers[i].offset);
366 if (result)
367 break;
368 }
369 return result;
370}
371
372static int acpi_battery_get_state(struct acpi_battery *battery)
373{
374 int i, result = 0;
375
376 if (battery->update_time &&
377 time_before(jiffies, battery->update_time +
378 msecs_to_jiffies(cache_time)))
379 return 0;
380 for (i = 0; i < ARRAY_SIZE(state_readers); ++i) {
381 result = acpi_smbus_read(battery->sbs->hc,
382 state_readers[i].mode,
383 ACPI_SBS_BATTERY,
384 state_readers[i].command,
385 (u8 *)battery +
386 state_readers[i].offset);
387 if (result)
388 goto end;
389 }
390 end:
391 battery->update_time = jiffies;
392 return result;
393}
394
395static int acpi_battery_get_alarm(struct acpi_battery *battery)
396{
397 return acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
398 ACPI_SBS_BATTERY, 0x01,
399 (u8 *)&battery->alarm_capacity);
400}
401
402static int acpi_battery_set_alarm(struct acpi_battery *battery)
403{
404 struct acpi_sbs *sbs = battery->sbs;
405 u16 value, sel = 1 << (battery->id + 12);
406
407 int ret;
408
409
410 if (sbs->manager_present) {
411 ret = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
412 0x01, (u8 *)&value);
413 if (ret)
414 goto end;
415 if ((value & 0xf000) != sel) {
416 value &= 0x0fff;
417 value |= sel;
418 ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD,
419 ACPI_SBS_MANAGER,
420 0x01, (u8 *)&value, 2);
421 if (ret)
422 goto end;
423 }
424 }
425 ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD, ACPI_SBS_BATTERY,
426 0x01, (u8 *)&battery->alarm_capacity, 2);
427 end:
428 return ret;
429}
430
431static int acpi_ac_get_present(struct acpi_sbs *sbs)
432{
433 int result;
434 u16 status;
435
436 result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_CHARGER,
437 0x13, (u8 *) & status);
438
439 if (result)
440 return result;
441
442 /*
443 * The spec requires that bit 4 always be 1. If it's not set, assume
444 * that the implementation doesn't support an SBS charger.
445 *
446 * And on some MacBooks a status of 0xffff is always returned, no
447 * matter whether the charger is plugged in or not, which is also
448 * wrong, so ignore the SBS charger for those too.
449 */
450 if (!((status >> 4) & 0x1) || status == 0xffff)
451 return -ENODEV;
452
453 sbs->charger_present = (status >> 15) & 0x1;
454 return 0;
455}
456
457static ssize_t acpi_battery_alarm_show(struct device *dev,
458 struct device_attribute *attr,
459 char *buf)
460{
461 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
462 acpi_battery_get_alarm(battery);
463 return sprintf(buf, "%d\n", battery->alarm_capacity *
464 acpi_battery_scale(battery) * 1000);
465}
466
467static ssize_t acpi_battery_alarm_store(struct device *dev,
468 struct device_attribute *attr,
469 const char *buf, size_t count)
470{
471 unsigned long x;
472 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
473 if (sscanf(buf, "%lu\n", &x) == 1)
474 battery->alarm_capacity = x /
475 (1000 * acpi_battery_scale(battery));
476 if (battery->present)
477 acpi_battery_set_alarm(battery);
478 return count;
479}
480
481static const struct device_attribute alarm_attr = {
482 .attr = {.name = "alarm", .mode = 0644},
483 .show = acpi_battery_alarm_show,
484 .store = acpi_battery_alarm_store,
485};
486
487/* --------------------------------------------------------------------------
488 Driver Interface
489 -------------------------------------------------------------------------- */
490static int acpi_battery_read(struct acpi_battery *battery)
491{
492 int result = 0, saved_present = battery->present;
493 u16 state;
494
495 if (battery->sbs->manager_present) {
496 result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
497 ACPI_SBS_MANAGER, 0x01, (u8 *)&state);
498 if (!result)
499 battery->present = state & (1 << battery->id);
500 state &= 0x0fff;
501 state |= 1 << (battery->id + 12);
502 acpi_smbus_write(battery->sbs->hc, SMBUS_WRITE_WORD,
503 ACPI_SBS_MANAGER, 0x01, (u8 *)&state, 2);
504 } else if (battery->id == 0)
505 battery->present = 1;
506
507 if (result || !battery->present)
508 return result;
509
510 if (saved_present != battery->present) {
511 battery->update_time = 0;
512 result = acpi_battery_get_info(battery);
513 if (result) {
514 battery->present = 0;
515 return result;
516 }
517 }
518 result = acpi_battery_get_state(battery);
519 if (result)
520 battery->present = 0;
521 return result;
522}
523
524/* Smart Battery */
525static int acpi_battery_add(struct acpi_sbs *sbs, int id)
526{
527 struct acpi_battery *battery = &sbs->battery[id];
528 struct power_supply_config psy_cfg = { .drv_data = battery, };
529 int result;
530
531 battery->id = id;
532 battery->sbs = sbs;
533 result = acpi_battery_read(battery);
534 if (result)
535 return result;
536
537 sprintf(battery->name, ACPI_BATTERY_DIR_NAME, id);
538 battery->bat_desc.name = battery->name;
539 battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY;
540 if (!acpi_battery_mode(battery)) {
541 battery->bat_desc.properties = sbs_charge_battery_props;
542 battery->bat_desc.num_properties =
543 ARRAY_SIZE(sbs_charge_battery_props);
544 } else {
545 battery->bat_desc.properties = sbs_energy_battery_props;
546 battery->bat_desc.num_properties =
547 ARRAY_SIZE(sbs_energy_battery_props);
548 }
549 battery->bat_desc.get_property = acpi_sbs_battery_get_property;
550 battery->bat = power_supply_register(&sbs->device->dev,
551 &battery->bat_desc, &psy_cfg);
552 if (IS_ERR(battery->bat)) {
553 result = PTR_ERR(battery->bat);
554 battery->bat = NULL;
555 goto end;
556 }
557
558 result = device_create_file(&battery->bat->dev, &alarm_attr);
559 if (result)
560 goto end;
561 battery->have_sysfs_alarm = 1;
562 end:
563 printk(KERN_INFO PREFIX "%s [%s]: Battery Slot [%s] (battery %s)\n",
564 ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
565 battery->name, battery->present ? "present" : "absent");
566 return result;
567}
568
569static void acpi_battery_remove(struct acpi_sbs *sbs, int id)
570{
571 struct acpi_battery *battery = &sbs->battery[id];
572
573 if (battery->bat) {
574 if (battery->have_sysfs_alarm)
575 device_remove_file(&battery->bat->dev, &alarm_attr);
576 power_supply_unregister(battery->bat);
577 }
578}
579
580static int acpi_charger_add(struct acpi_sbs *sbs)
581{
582 int result;
583 struct power_supply_config psy_cfg = { .drv_data = sbs, };
584
585 result = acpi_ac_get_present(sbs);
586 if (result)
587 goto end;
588
589 sbs->charger_exists = 1;
590 sbs->charger = power_supply_register(&sbs->device->dev,
591 &acpi_sbs_charger_desc, &psy_cfg);
592 if (IS_ERR(sbs->charger)) {
593 result = PTR_ERR(sbs->charger);
594 sbs->charger = NULL;
595 }
596 printk(KERN_INFO PREFIX "%s [%s]: AC Adapter [%s] (%s)\n",
597 ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
598 ACPI_AC_DIR_NAME, sbs->charger_present ? "on-line" : "off-line");
599 end:
600 return result;
601}
602
603static void acpi_charger_remove(struct acpi_sbs *sbs)
604{
605 if (sbs->charger)
606 power_supply_unregister(sbs->charger);
607}
608
609static void acpi_sbs_callback(void *context)
610{
611 int id;
612 struct acpi_sbs *sbs = context;
613 struct acpi_battery *bat;
614 u8 saved_charger_state = sbs->charger_present;
615 u8 saved_battery_state;
616
617 if (sbs->charger_exists) {
618 acpi_ac_get_present(sbs);
619 if (sbs->charger_present != saved_charger_state)
620 kobject_uevent(&sbs->charger->dev.kobj, KOBJ_CHANGE);
621 }
622
623 if (sbs->manager_present) {
624 for (id = 0; id < MAX_SBS_BAT; ++id) {
625 if (!(sbs->batteries_supported & (1 << id)))
626 continue;
627 bat = &sbs->battery[id];
628 saved_battery_state = bat->present;
629 acpi_battery_read(bat);
630 if (saved_battery_state == bat->present)
631 continue;
632 kobject_uevent(&bat->bat->dev.kobj, KOBJ_CHANGE);
633 }
634 }
635}
636
637static int acpi_sbs_add(struct acpi_device *device)
638{
639 struct acpi_sbs *sbs;
640 int result = 0;
641 int id;
642
643 sbs = kzalloc(sizeof(struct acpi_sbs), GFP_KERNEL);
644 if (!sbs) {
645 result = -ENOMEM;
646 goto end;
647 }
648
649 mutex_init(&sbs->lock);
650
651 sbs->hc = acpi_driver_data(device->parent);
652 sbs->device = device;
653 strcpy(acpi_device_name(device), ACPI_SBS_DEVICE_NAME);
654 strcpy(acpi_device_class(device), ACPI_SBS_CLASS);
655 device->driver_data = sbs;
656
657 result = acpi_charger_add(sbs);
658 if (result && result != -ENODEV)
659 goto end;
660
661 result = 0;
662
663 if (!x86_apple_machine) {
664 result = acpi_manager_get_info(sbs);
665 if (!result) {
666 sbs->manager_present = 1;
667 for (id = 0; id < MAX_SBS_BAT; ++id)
668 if ((sbs->batteries_supported & (1 << id)))
669 acpi_battery_add(sbs, id);
670 }
671 }
672
673 if (!sbs->manager_present)
674 acpi_battery_add(sbs, 0);
675
676 acpi_smbus_register_callback(sbs->hc, acpi_sbs_callback, sbs);
677 end:
678 if (result)
679 acpi_sbs_remove(device);
680 return result;
681}
682
683static int acpi_sbs_remove(struct acpi_device *device)
684{
685 struct acpi_sbs *sbs;
686 int id;
687
688 if (!device)
689 return -EINVAL;
690 sbs = acpi_driver_data(device);
691 if (!sbs)
692 return -EINVAL;
693 mutex_lock(&sbs->lock);
694 acpi_smbus_unregister_callback(sbs->hc);
695 for (id = 0; id < MAX_SBS_BAT; ++id)
696 acpi_battery_remove(sbs, id);
697 acpi_charger_remove(sbs);
698 mutex_unlock(&sbs->lock);
699 mutex_destroy(&sbs->lock);
700 kfree(sbs);
701 return 0;
702}
703
704#ifdef CONFIG_PM_SLEEP
705static int acpi_sbs_resume(struct device *dev)
706{
707 struct acpi_sbs *sbs;
708 if (!dev)
709 return -EINVAL;
710 sbs = to_acpi_device(dev)->driver_data;
711 acpi_sbs_callback(sbs);
712 return 0;
713}
714#else
715#define acpi_sbs_resume NULL
716#endif
717
718static SIMPLE_DEV_PM_OPS(acpi_sbs_pm, NULL, acpi_sbs_resume);
719
720static struct acpi_driver acpi_sbs_driver = {
721 .name = "sbs",
722 .class = ACPI_SBS_CLASS,
723 .ids = sbs_device_ids,
724 .ops = {
725 .add = acpi_sbs_add,
726 .remove = acpi_sbs_remove,
727 },
728 .drv.pm = &acpi_sbs_pm,
729};
730
731static int __init acpi_sbs_init(void)
732{
733 int result = 0;
734
735 if (acpi_disabled)
736 return -ENODEV;
737
738 result = acpi_bus_register_driver(&acpi_sbs_driver);
739 if (result < 0)
740 return -ENODEV;
741
742 return 0;
743}
744
745static void __exit acpi_sbs_exit(void)
746{
747 acpi_bus_unregister_driver(&acpi_sbs_driver);
748 return;
749}
750
751module_init(acpi_sbs_init);
752module_exit(acpi_sbs_exit);
753