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powercap: restrict energy meter to root access
[linux/fpc-iii.git] / drivers / acpi / sbs.c
blob4a76000bcf7a47e7922539282fe100581c399d57
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);
Linux with added FPC-III support