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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / acpi / sbs.c
blob6e88224f60f097525120de47626d5249050123df
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * sbs.c - ACPI Smart Battery System Driver ($Revision: 2.0 $)
4 *
5 * Copyright (c) 2007 Alexey Starikovskiy <astarikovskiy@suse.de>
6 * Copyright (c) 2005-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com>
7 * Copyright (c) 2005 Rich Townsend <rhdt@bartol.udel.edu>
8 */
9
10 #include <linux/init.h>
11 #include <linux/slab.h>
12 #include <linux/module.h>
13 #include <linux/moduleparam.h>
14 #include <linux/kernel.h>
15
16 #include <linux/acpi.h>
17 #include <linux/timer.h>
18 #include <linux/jiffies.h>
19 #include <linux/delay.h>
20 #include <linux/power_supply.h>
21 #include <linux/platform_data/x86/apple.h>
22 #include <acpi/battery.h>
23
24 #include "sbshc.h"
25
26 #define PREFIX "ACPI: "
27
28 #define ACPI_SBS_CLASS "sbs"
29 #define ACPI_AC_CLASS "ac_adapter"
30 #define ACPI_SBS_DEVICE_NAME "Smart Battery System"
31 #define ACPI_SBS_FILE_INFO "info"
32 #define ACPI_SBS_FILE_STATE "state"
33 #define ACPI_SBS_FILE_ALARM "alarm"
34 #define ACPI_BATTERY_DIR_NAME "BAT%i"
35 #define ACPI_AC_DIR_NAME "AC0"
36
37 #define ACPI_SBS_NOTIFY_STATUS 0x80
38 #define ACPI_SBS_NOTIFY_INFO 0x81
39
40 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
41 MODULE_DESCRIPTION("Smart Battery System ACPI interface driver");
42 MODULE_LICENSE("GPL");
43
44 static unsigned int cache_time = 1000;
45 module_param(cache_time, uint, 0644);
46 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
47
48 #define MAX_SBS_BAT 4
49 #define ACPI_SBS_BLOCK_MAX 32
50
51 static const struct acpi_device_id sbs_device_ids[] = {
52 {"ACPI0002", 0},
53 {"", 0},
54 };
55 MODULE_DEVICE_TABLE(acpi, sbs_device_ids);
56
57 struct acpi_battery {
58 struct power_supply *bat;
59 struct power_supply_desc bat_desc;
60 struct acpi_sbs *sbs;
61 unsigned long update_time;
62 char name[8];
63 char manufacturer_name[ACPI_SBS_BLOCK_MAX];
64 char device_name[ACPI_SBS_BLOCK_MAX];
65 char device_chemistry[ACPI_SBS_BLOCK_MAX];
66 u16 alarm_capacity;
67 u16 full_charge_capacity;
68 u16 design_capacity;
69 u16 design_voltage;
70 u16 serial_number;
71 u16 cycle_count;
72 u16 temp_now;
73 u16 voltage_now;
74 s16 rate_now;
75 s16 rate_avg;
76 u16 capacity_now;
77 u16 state_of_charge;
78 u16 state;
79 u16 mode;
80 u16 spec;
81 u8 id;
82 u8 present:1;
83 u8 have_sysfs_alarm:1;
84 };
85
86 #define to_acpi_battery(x) power_supply_get_drvdata(x)
87
88 struct acpi_sbs {
89 struct power_supply *charger;
90 struct acpi_device *device;
91 struct acpi_smb_hc *hc;
92 struct mutex lock;
93 struct acpi_battery battery[MAX_SBS_BAT];
94 u8 batteries_supported:4;
95 u8 manager_present:1;
96 u8 charger_present:1;
97 u8 charger_exists:1;
98 };
99
100 #define to_acpi_sbs(x) power_supply_get_drvdata(x)
101
102 static int acpi_sbs_remove(struct acpi_device *device);
103 static int acpi_battery_get_state(struct acpi_battery *battery);
104
105 static inline int battery_scale(int log)
106 {
107 int scale = 1;
108 while (log--)
109 scale *= 10;
110 return scale;
111 }
112
113 static inline int acpi_battery_vscale(struct acpi_battery *battery)
114 {
115 return battery_scale((battery->spec & 0x0f00) >> 8);
116 }
117
118 static inline int acpi_battery_ipscale(struct acpi_battery *battery)
119 {
120 return battery_scale((battery->spec & 0xf000) >> 12);
121 }
122
123 static inline int acpi_battery_mode(struct acpi_battery *battery)
124 {
125 return (battery->mode & 0x8000);
126 }
127
128 static inline int acpi_battery_scale(struct acpi_battery *battery)
129 {
130 return (acpi_battery_mode(battery) ? 10 : 1) *
131 acpi_battery_ipscale(battery);
132 }
133
134 static int sbs_get_ac_property(struct power_supply *psy,
135 enum power_supply_property psp,
136 union power_supply_propval *val)
137 {
138 struct acpi_sbs *sbs = to_acpi_sbs(psy);
139 switch (psp) {
140 case POWER_SUPPLY_PROP_ONLINE:
141 val->intval = sbs->charger_present;
142 break;
143 default:
144 return -EINVAL;
145 }
146 return 0;
147 }
148
149 static int acpi_battery_technology(struct acpi_battery *battery)
150 {
151 if (!strcasecmp("NiCd", battery->device_chemistry))
152 return POWER_SUPPLY_TECHNOLOGY_NiCd;
153 if (!strcasecmp("NiMH", battery->device_chemistry))
154 return POWER_SUPPLY_TECHNOLOGY_NiMH;
155 if (!strcasecmp("LION", battery->device_chemistry))
156 return POWER_SUPPLY_TECHNOLOGY_LION;
157 if (!strcasecmp("LiP", battery->device_chemistry))
158 return POWER_SUPPLY_TECHNOLOGY_LIPO;
159 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
160 }
161
162 static int acpi_sbs_battery_get_property(struct power_supply *psy,
163 enum power_supply_property psp,
164 union power_supply_propval *val)
165 {
166 struct acpi_battery *battery = to_acpi_battery(psy);
167
168 if ((!battery->present) && psp != POWER_SUPPLY_PROP_PRESENT)
169 return -ENODEV;
170
171 acpi_battery_get_state(battery);
172 switch (psp) {
173 case POWER_SUPPLY_PROP_STATUS:
174 if (battery->rate_now < 0)
175 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
176 else if (battery->rate_now > 0)
177 val->intval = POWER_SUPPLY_STATUS_CHARGING;
178 else
179 val->intval = POWER_SUPPLY_STATUS_FULL;
180 break;
181 case POWER_SUPPLY_PROP_PRESENT:
182 val->intval = battery->present;
183 break;
184 case POWER_SUPPLY_PROP_TECHNOLOGY:
185 val->intval = acpi_battery_technology(battery);
186 break;
187 case POWER_SUPPLY_PROP_CYCLE_COUNT:
188 val->intval = battery->cycle_count;
189 break;
190 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
191 val->intval = battery->design_voltage *
192 acpi_battery_vscale(battery) * 1000;
193 break;
194 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
195 val->intval = battery->voltage_now *
196 acpi_battery_vscale(battery) * 1000;
197 break;
198 case POWER_SUPPLY_PROP_CURRENT_NOW:
199 case POWER_SUPPLY_PROP_POWER_NOW:
200 val->intval = abs(battery->rate_now) *
201 acpi_battery_ipscale(battery) * 1000;
202 val->intval *= (acpi_battery_mode(battery)) ?
203 (battery->voltage_now *
204 acpi_battery_vscale(battery) / 1000) : 1;
205 break;
206 case POWER_SUPPLY_PROP_CURRENT_AVG:
207 case POWER_SUPPLY_PROP_POWER_AVG:
208 val->intval = abs(battery->rate_avg) *
209 acpi_battery_ipscale(battery) * 1000;
210 val->intval *= (acpi_battery_mode(battery)) ?
211 (battery->voltage_now *
212 acpi_battery_vscale(battery) / 1000) : 1;
213 break;
214 case POWER_SUPPLY_PROP_CAPACITY:
215 val->intval = battery->state_of_charge;
216 break;
217 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
218 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
219 val->intval = battery->design_capacity *
220 acpi_battery_scale(battery) * 1000;
221 break;
222 case POWER_SUPPLY_PROP_CHARGE_FULL:
223 case POWER_SUPPLY_PROP_ENERGY_FULL:
224 val->intval = battery->full_charge_capacity *
225 acpi_battery_scale(battery) * 1000;
226 break;
227 case POWER_SUPPLY_PROP_CHARGE_NOW:
228 case POWER_SUPPLY_PROP_ENERGY_NOW:
229 val->intval = battery->capacity_now *
230 acpi_battery_scale(battery) * 1000;
231 break;
232 case POWER_SUPPLY_PROP_TEMP:
233 val->intval = battery->temp_now - 2730; // dK -> dC
234 break;
235 case POWER_SUPPLY_PROP_MODEL_NAME:
236 val->strval = battery->device_name;
237 break;
238 case POWER_SUPPLY_PROP_MANUFACTURER:
239 val->strval = battery->manufacturer_name;
240 break;
241 default:
242 return -EINVAL;
243 }
244 return 0;
245 }
246
247 static enum power_supply_property sbs_ac_props[] = {
248 POWER_SUPPLY_PROP_ONLINE,
249 };
250
251 static enum power_supply_property sbs_charge_battery_props[] = {
252 POWER_SUPPLY_PROP_STATUS,
253 POWER_SUPPLY_PROP_PRESENT,
254 POWER_SUPPLY_PROP_TECHNOLOGY,
255 POWER_SUPPLY_PROP_CYCLE_COUNT,
256 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
257 POWER_SUPPLY_PROP_VOLTAGE_NOW,
258 POWER_SUPPLY_PROP_CURRENT_NOW,
259 POWER_SUPPLY_PROP_CURRENT_AVG,
260 POWER_SUPPLY_PROP_CAPACITY,
261 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
262 POWER_SUPPLY_PROP_CHARGE_FULL,
263 POWER_SUPPLY_PROP_CHARGE_NOW,
264 POWER_SUPPLY_PROP_TEMP,
265 POWER_SUPPLY_PROP_MODEL_NAME,
266 POWER_SUPPLY_PROP_MANUFACTURER,
267 };
268
269 static enum power_supply_property sbs_energy_battery_props[] = {
270 POWER_SUPPLY_PROP_STATUS,
271 POWER_SUPPLY_PROP_PRESENT,
272 POWER_SUPPLY_PROP_TECHNOLOGY,
273 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
274 POWER_SUPPLY_PROP_VOLTAGE_NOW,
275 POWER_SUPPLY_PROP_CURRENT_NOW,
276 POWER_SUPPLY_PROP_CURRENT_AVG,
277 POWER_SUPPLY_PROP_POWER_NOW,
278 POWER_SUPPLY_PROP_POWER_AVG,
279 POWER_SUPPLY_PROP_CAPACITY,
280 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
281 POWER_SUPPLY_PROP_ENERGY_FULL,
282 POWER_SUPPLY_PROP_ENERGY_NOW,
283 POWER_SUPPLY_PROP_TEMP,
284 POWER_SUPPLY_PROP_MODEL_NAME,
285 POWER_SUPPLY_PROP_MANUFACTURER,
286 };
287
288 static const struct power_supply_desc acpi_sbs_charger_desc = {
289 .name = "sbs-charger",
290 .type = POWER_SUPPLY_TYPE_MAINS,
291 .properties = sbs_ac_props,
292 .num_properties = ARRAY_SIZE(sbs_ac_props),
293 .get_property = sbs_get_ac_property,
294 };
295
296 /* --------------------------------------------------------------------------
297 Smart Battery System Management
298 -------------------------------------------------------------------------- */
299
300 struct acpi_battery_reader {
301 u8 command; /* command for battery */
302 u8 mode; /* word or block? */
303 size_t offset; /* offset inside struct acpi_sbs_battery */
304 };
305
306 static struct acpi_battery_reader info_readers[] = {
307 {0x01, SMBUS_READ_WORD, offsetof(struct acpi_battery, alarm_capacity)},
308 {0x03, SMBUS_READ_WORD, offsetof(struct acpi_battery, mode)},
309 {0x10, SMBUS_READ_WORD, offsetof(struct acpi_battery, full_charge_capacity)},
310 {0x17, SMBUS_READ_WORD, offsetof(struct acpi_battery, cycle_count)},
311 {0x18, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_capacity)},
312 {0x19, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_voltage)},
313 {0x1a, SMBUS_READ_WORD, offsetof(struct acpi_battery, spec)},
314 {0x1c, SMBUS_READ_WORD, offsetof(struct acpi_battery, serial_number)},
315 {0x20, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, manufacturer_name)},
316 {0x21, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_name)},
317 {0x22, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_chemistry)},
318 };
319
320 static struct acpi_battery_reader state_readers[] = {
321 {0x08, SMBUS_READ_WORD, offsetof(struct acpi_battery, temp_now)},
322 {0x09, SMBUS_READ_WORD, offsetof(struct acpi_battery, voltage_now)},
323 {0x0a, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_now)},
324 {0x0b, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_avg)},
325 {0x0f, SMBUS_READ_WORD, offsetof(struct acpi_battery, capacity_now)},
326 {0x0e, SMBUS_READ_WORD, offsetof(struct acpi_battery, state_of_charge)},
327 {0x16, SMBUS_READ_WORD, offsetof(struct acpi_battery, state)},
328 };
329
330 static int acpi_manager_get_info(struct acpi_sbs *sbs)
331 {
332 int result = 0;
333 u16 battery_system_info;
334
335 result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
336 0x04, (u8 *)&battery_system_info);
337 if (!result)
338 sbs->batteries_supported = battery_system_info & 0x000f;
339 return result;
340 }
341
342 static int acpi_battery_get_info(struct acpi_battery *battery)
343 {
344 int i, result = 0;
345
346 for (i = 0; i < ARRAY_SIZE(info_readers); ++i) {
347 result = acpi_smbus_read(battery->sbs->hc,
348 info_readers[i].mode,
349 ACPI_SBS_BATTERY,
350 info_readers[i].command,
351 (u8 *) battery +
352 info_readers[i].offset);
353 if (result)
354 break;
355 }
356 return result;
357 }
358
359 static int acpi_battery_get_state(struct acpi_battery *battery)
360 {
361 int i, result = 0;
362
363 if (battery->update_time &&
364 time_before(jiffies, battery->update_time +
365 msecs_to_jiffies(cache_time)))
366 return 0;
367 for (i = 0; i < ARRAY_SIZE(state_readers); ++i) {
368 result = acpi_smbus_read(battery->sbs->hc,
369 state_readers[i].mode,
370 ACPI_SBS_BATTERY,
371 state_readers[i].command,
372 (u8 *)battery +
373 state_readers[i].offset);
374 if (result)
375 goto end;
376 }
377 end:
378 battery->update_time = jiffies;
379 return result;
380 }
381
382 static int acpi_battery_get_alarm(struct acpi_battery *battery)
383 {
384 return acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
385 ACPI_SBS_BATTERY, 0x01,
386 (u8 *)&battery->alarm_capacity);
387 }
388
389 static int acpi_battery_set_alarm(struct acpi_battery *battery)
390 {
391 struct acpi_sbs *sbs = battery->sbs;
392 u16 value, sel = 1 << (battery->id + 12);
393
394 int ret;
395
396
397 if (sbs->manager_present) {
398 ret = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
399 0x01, (u8 *)&value);
400 if (ret)
401 goto end;
402 if ((value & 0xf000) != sel) {
403 value &= 0x0fff;
404 value |= sel;
405 ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD,
406 ACPI_SBS_MANAGER,
407 0x01, (u8 *)&value, 2);
408 if (ret)
409 goto end;
410 }
411 }
412 ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD, ACPI_SBS_BATTERY,
413 0x01, (u8 *)&battery->alarm_capacity, 2);
414 end:
415 return ret;
416 }
417
418 static int acpi_ac_get_present(struct acpi_sbs *sbs)
419 {
420 int result;
421 u16 status;
422
423 result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_CHARGER,
424 0x13, (u8 *) & status);
425
426 if (result)
427 return result;
428
429 /*
430 * The spec requires that bit 4 always be 1. If it's not set, assume
431 * that the implementation doesn't support an SBS charger.
432 *
433 * And on some MacBooks a status of 0xffff is always returned, no
434 * matter whether the charger is plugged in or not, which is also
435 * wrong, so ignore the SBS charger for those too.
436 */
437 if (!((status >> 4) & 0x1) || status == 0xffff)
438 return -ENODEV;
439
440 sbs->charger_present = (status >> 15) & 0x1;
441 return 0;
442 }
443
444 static ssize_t acpi_battery_alarm_show(struct device *dev,
445 struct device_attribute *attr,
446 char *buf)
447 {
448 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
449 acpi_battery_get_alarm(battery);
450 return sprintf(buf, "%d\n", battery->alarm_capacity *
451 acpi_battery_scale(battery) * 1000);
452 }
453
454 static ssize_t acpi_battery_alarm_store(struct device *dev,
455 struct device_attribute *attr,
456 const char *buf, size_t count)
457 {
458 unsigned long x;
459 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
460 if (sscanf(buf, "%lu\n", &x) == 1)
461 battery->alarm_capacity = x /
462 (1000 * acpi_battery_scale(battery));
463 if (battery->present)
464 acpi_battery_set_alarm(battery);
465 return count;
466 }
467
468 static const struct device_attribute alarm_attr = {
469 .attr = {.name = "alarm", .mode = 0644},
470 .show = acpi_battery_alarm_show,
471 .store = acpi_battery_alarm_store,
472 };
473
474 /* --------------------------------------------------------------------------
475 Driver Interface
476 -------------------------------------------------------------------------- */
477 static int acpi_battery_read(struct acpi_battery *battery)
478 {
479 int result = 0, saved_present = battery->present;
480 u16 state;
481
482 if (battery->sbs->manager_present) {
483 result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
484 ACPI_SBS_MANAGER, 0x01, (u8 *)&state);
485 if (!result)
486 battery->present = state & (1 << battery->id);
487 state &= 0x0fff;
488 state |= 1 << (battery->id + 12);
489 acpi_smbus_write(battery->sbs->hc, SMBUS_WRITE_WORD,
490 ACPI_SBS_MANAGER, 0x01, (u8 *)&state, 2);
491 } else if (battery->id == 0)
492 battery->present = 1;
493
494 if (result || !battery->present)
495 return result;
496
497 if (saved_present != battery->present) {
498 battery->update_time = 0;
499 result = acpi_battery_get_info(battery);
500 if (result) {
501 battery->present = 0;
502 return result;
503 }
504 }
505 result = acpi_battery_get_state(battery);
506 if (result)
507 battery->present = 0;
508 return result;
509 }
510
511 /* Smart Battery */
512 static int acpi_battery_add(struct acpi_sbs *sbs, int id)
513 {
514 struct acpi_battery *battery = &sbs->battery[id];
515 struct power_supply_config psy_cfg = { .drv_data = battery, };
516 int result;
517
518 battery->id = id;
519 battery->sbs = sbs;
520 result = acpi_battery_read(battery);
521 if (result)
522 return result;
523
524 sprintf(battery->name, ACPI_BATTERY_DIR_NAME, id);
525 battery->bat_desc.name = battery->name;
526 battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY;
527 if (!acpi_battery_mode(battery)) {
528 battery->bat_desc.properties = sbs_charge_battery_props;
529 battery->bat_desc.num_properties =
530 ARRAY_SIZE(sbs_charge_battery_props);
531 } else {
532 battery->bat_desc.properties = sbs_energy_battery_props;
533 battery->bat_desc.num_properties =
534 ARRAY_SIZE(sbs_energy_battery_props);
535 }
536 battery->bat_desc.get_property = acpi_sbs_battery_get_property;
537 battery->bat = power_supply_register(&sbs->device->dev,
538 &battery->bat_desc, &psy_cfg);
539 if (IS_ERR(battery->bat)) {
540 result = PTR_ERR(battery->bat);
541 battery->bat = NULL;
542 goto end;
543 }
544
545 result = device_create_file(&battery->bat->dev, &alarm_attr);
546 if (result)
547 goto end;
548 battery->have_sysfs_alarm = 1;
549 end:
550 printk(KERN_INFO PREFIX "%s [%s]: Battery Slot [%s] (battery %s)\n",
551 ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
552 battery->name, battery->present ? "present" : "absent");
553 return result;
554 }
555
556 static void acpi_battery_remove(struct acpi_sbs *sbs, int id)
557 {
558 struct acpi_battery *battery = &sbs->battery[id];
559
560 if (battery->bat) {
561 if (battery->have_sysfs_alarm)
562 device_remove_file(&battery->bat->dev, &alarm_attr);
563 power_supply_unregister(battery->bat);
564 }
565 }
566
567 static int acpi_charger_add(struct acpi_sbs *sbs)
568 {
569 int result;
570 struct power_supply_config psy_cfg = { .drv_data = sbs, };
571
572 result = acpi_ac_get_present(sbs);
573 if (result)
574 goto end;
575
576 sbs->charger_exists = 1;
577 sbs->charger = power_supply_register(&sbs->device->dev,
578 &acpi_sbs_charger_desc, &psy_cfg);
579 if (IS_ERR(sbs->charger)) {
580 result = PTR_ERR(sbs->charger);
581 sbs->charger = NULL;
582 }
583 printk(KERN_INFO PREFIX "%s [%s]: AC Adapter [%s] (%s)\n",
584 ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
585 ACPI_AC_DIR_NAME, sbs->charger_present ? "on-line" : "off-line");
586 end:
587 return result;
588 }
589
590 static void acpi_charger_remove(struct acpi_sbs *sbs)
591 {
592 if (sbs->charger)
593 power_supply_unregister(sbs->charger);
594 }
595
596 static void acpi_sbs_callback(void *context)
597 {
598 int id;
599 struct acpi_sbs *sbs = context;
600 struct acpi_battery *bat;
601 u8 saved_charger_state = sbs->charger_present;
602 u8 saved_battery_state;
603
604 if (sbs->charger_exists) {
605 acpi_ac_get_present(sbs);
606 if (sbs->charger_present != saved_charger_state)
607 kobject_uevent(&sbs->charger->dev.kobj, KOBJ_CHANGE);
608 }
609
610 if (sbs->manager_present) {
611 for (id = 0; id < MAX_SBS_BAT; ++id) {
612 if (!(sbs->batteries_supported & (1 << id)))
613 continue;
614 bat = &sbs->battery[id];
615 saved_battery_state = bat->present;
616 acpi_battery_read(bat);
617 if (saved_battery_state == bat->present)
618 continue;
619 kobject_uevent(&bat->bat->dev.kobj, KOBJ_CHANGE);
620 }
621 }
622 }
623
624 static int acpi_sbs_add(struct acpi_device *device)
625 {
626 struct acpi_sbs *sbs;
627 int result = 0;
628 int id;
629
630 sbs = kzalloc(sizeof(struct acpi_sbs), GFP_KERNEL);
631 if (!sbs) {
632 result = -ENOMEM;
633 goto end;
634 }
635
636 mutex_init(&sbs->lock);
637
638 sbs->hc = acpi_driver_data(device->parent);
639 sbs->device = device;
640 strcpy(acpi_device_name(device), ACPI_SBS_DEVICE_NAME);
641 strcpy(acpi_device_class(device), ACPI_SBS_CLASS);
642 device->driver_data = sbs;
643
644 result = acpi_charger_add(sbs);
645 if (result && result != -ENODEV)
646 goto end;
647
648 result = 0;
649
650 if (!x86_apple_machine) {
651 result = acpi_manager_get_info(sbs);
652 if (!result) {
653 sbs->manager_present = 1;
654 for (id = 0; id < MAX_SBS_BAT; ++id)
655 if ((sbs->batteries_supported & (1 << id)))
656 acpi_battery_add(sbs, id);
657 }
658 }
659
660 if (!sbs->manager_present)
661 acpi_battery_add(sbs, 0);
662
663 acpi_smbus_register_callback(sbs->hc, acpi_sbs_callback, sbs);
664 end:
665 if (result)
666 acpi_sbs_remove(device);
667 return result;
668 }
669
670 static int acpi_sbs_remove(struct acpi_device *device)
671 {
672 struct acpi_sbs *sbs;
673 int id;
674
675 if (!device)
676 return -EINVAL;
677 sbs = acpi_driver_data(device);
678 if (!sbs)
679 return -EINVAL;
680 mutex_lock(&sbs->lock);
681 acpi_smbus_unregister_callback(sbs->hc);
682 for (id = 0; id < MAX_SBS_BAT; ++id)
683 acpi_battery_remove(sbs, id);
684 acpi_charger_remove(sbs);
685 mutex_unlock(&sbs->lock);
686 mutex_destroy(&sbs->lock);
687 kfree(sbs);
688 return 0;
689 }
690
691 #ifdef CONFIG_PM_SLEEP
692 static int acpi_sbs_resume(struct device *dev)
693 {
694 struct acpi_sbs *sbs;
695 if (!dev)
696 return -EINVAL;
697 sbs = to_acpi_device(dev)->driver_data;
698 acpi_sbs_callback(sbs);
699 return 0;
700 }
701 #else
702 #define acpi_sbs_resume NULL
703 #endif
704
705 static SIMPLE_DEV_PM_OPS(acpi_sbs_pm, NULL, acpi_sbs_resume);
706
707 static struct acpi_driver acpi_sbs_driver = {
708 .name = "sbs",
709 .class = ACPI_SBS_CLASS,
710 .ids = sbs_device_ids,
711 .ops = {
712 .add = acpi_sbs_add,
713 .remove = acpi_sbs_remove,
714 },
715 .drv.pm = &acpi_sbs_pm,
716 };
717
718 static int __init acpi_sbs_init(void)
719 {
720 int result = 0;
721
722 if (acpi_disabled)
723 return -ENODEV;
724
725 result = acpi_bus_register_driver(&acpi_sbs_driver);
726 if (result < 0)
727 return -ENODEV;
728
729 return 0;
730 }
731
732 static void __exit acpi_sbs_exit(void)
733 {
734 acpi_bus_unregister_driver(&acpi_sbs_driver);
735 return;
736 }
737
738 module_init(acpi_sbs_init);
739 module_exit(acpi_sbs_exit);
Linux with added FPC-III support