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