5717bd300869939154f02ce85a69ea61497f47e2
[linux-3.10.git] / drivers / acpi / battery.c
1 /*
2  *  battery.c - ACPI Battery Driver (Revision: 2.0)
3  *
4  *  Copyright (C) 2007 Alexey Starikovskiy <astarikovskiy@suse.de>
5  *  Copyright (C) 2004-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com>
6  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
7  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
8  *
9  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10  *
11  *  This program is free software; you can redistribute it and/or modify
12  *  it under the terms of the GNU General Public License as published by
13  *  the Free Software Foundation; either version 2 of the License, or (at
14  *  your option) any later version.
15  *
16  *  This program is distributed in the hope that it will be useful, but
17  *  WITHOUT ANY WARRANTY; without even the implied warranty of
18  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
19  *  General Public License for more details.
20  *
21  *  You should have received a copy of the GNU General Public License along
22  *  with this program; if not, write to the Free Software Foundation, Inc.,
23  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
24  *
25  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
26  */
27
28 #include <linux/kernel.h>
29 #include <linux/module.h>
30 #include <linux/init.h>
31 #include <linux/types.h>
32 #include <linux/jiffies.h>
33 #include <linux/async.h>
34 #include <linux/dmi.h>
35 #include <linux/slab.h>
36
37 #ifdef CONFIG_ACPI_PROCFS_POWER
38 #include <linux/proc_fs.h>
39 #include <linux/seq_file.h>
40 #include <asm/uaccess.h>
41 #endif
42
43 #include <acpi/acpi_bus.h>
44 #include <acpi/acpi_drivers.h>
45
46 #ifdef CONFIG_ACPI_SYSFS_POWER
47 #include <linux/power_supply.h>
48 #endif
49
50 #define PREFIX "ACPI: "
51
52 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
53
54 #define ACPI_BATTERY_CLASS              "battery"
55 #define ACPI_BATTERY_DEVICE_NAME        "Battery"
56 #define ACPI_BATTERY_NOTIFY_STATUS      0x80
57 #define ACPI_BATTERY_NOTIFY_INFO        0x81
58 #define ACPI_BATTERY_NOTIFY_THRESHOLD   0x82
59
60 #define _COMPONENT              ACPI_BATTERY_COMPONENT
61
62 ACPI_MODULE_NAME("battery");
63
64 MODULE_AUTHOR("Paul Diefenbaugh");
65 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
66 MODULE_DESCRIPTION("ACPI Battery Driver");
67 MODULE_LICENSE("GPL");
68
69 static unsigned int cache_time = 1000;
70 module_param(cache_time, uint, 0644);
71 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
72
73 #ifdef CONFIG_ACPI_PROCFS_POWER
74 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
75 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
76
77 enum acpi_battery_files {
78         info_tag = 0,
79         state_tag,
80         alarm_tag,
81         ACPI_BATTERY_NUMFILES,
82 };
83
84 #endif
85
86 static const struct acpi_device_id battery_device_ids[] = {
87         {"PNP0C0A", 0},
88         {"", 0},
89 };
90
91 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
92
93 enum {
94         ACPI_BATTERY_ALARM_PRESENT,
95         ACPI_BATTERY_XINFO_PRESENT,
96         /* For buggy DSDTs that report negative 16-bit values for either
97          * charging or discharging current and/or report 0 as 65536
98          * due to bad math.
99          */
100         ACPI_BATTERY_QUIRK_SIGNED16_CURRENT,
101 };
102
103 struct acpi_battery {
104         struct mutex lock;
105 #ifdef CONFIG_ACPI_SYSFS_POWER
106         struct power_supply bat;
107 #endif
108         struct acpi_device *device;
109         unsigned long update_time;
110         int rate_now;
111         int capacity_now;
112         int voltage_now;
113         int design_capacity;
114         int full_charge_capacity;
115         int technology;
116         int design_voltage;
117         int design_capacity_warning;
118         int design_capacity_low;
119         int cycle_count;
120         int measurement_accuracy;
121         int max_sampling_time;
122         int min_sampling_time;
123         int max_averaging_interval;
124         int min_averaging_interval;
125         int capacity_granularity_1;
126         int capacity_granularity_2;
127         int alarm;
128         char model_number[32];
129         char serial_number[32];
130         char type[32];
131         char oem_info[32];
132         int state;
133         int power_unit;
134         unsigned long flags;
135 };
136
137 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
138
139 inline int acpi_battery_present(struct acpi_battery *battery)
140 {
141         return battery->device->status.battery_present;
142 }
143
144 #ifdef CONFIG_ACPI_SYSFS_POWER
145 static int acpi_battery_technology(struct acpi_battery *battery)
146 {
147         if (!strcasecmp("NiCd", battery->type))
148                 return POWER_SUPPLY_TECHNOLOGY_NiCd;
149         if (!strcasecmp("NiMH", battery->type))
150                 return POWER_SUPPLY_TECHNOLOGY_NiMH;
151         if (!strcasecmp("LION", battery->type))
152                 return POWER_SUPPLY_TECHNOLOGY_LION;
153         if (!strncasecmp("LI-ION", battery->type, 6))
154                 return POWER_SUPPLY_TECHNOLOGY_LION;
155         if (!strcasecmp("LiP", battery->type))
156                 return POWER_SUPPLY_TECHNOLOGY_LIPO;
157         return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
158 }
159
160 static int acpi_battery_get_state(struct acpi_battery *battery);
161
162 static int acpi_battery_is_charged(struct acpi_battery *battery)
163 {
164         /* either charging or discharging */
165         if (battery->state != 0)
166                 return 0;
167
168         /* battery not reporting charge */
169         if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
170             battery->capacity_now == 0)
171                 return 0;
172
173         /* good batteries update full_charge as the batteries degrade */
174         if (battery->full_charge_capacity == battery->capacity_now)
175                 return 1;
176
177         /* fallback to using design values for broken batteries */
178         if (battery->design_capacity == battery->capacity_now)
179                 return 1;
180
181         /* we don't do any sort of metric based on percentages */
182         return 0;
183 }
184
185 static int acpi_battery_get_property(struct power_supply *psy,
186                                      enum power_supply_property psp,
187                                      union power_supply_propval *val)
188 {
189         struct acpi_battery *battery = to_acpi_battery(psy);
190
191         if (acpi_battery_present(battery)) {
192                 /* run battery update only if it is present */
193                 acpi_battery_get_state(battery);
194         } else if (psp != POWER_SUPPLY_PROP_PRESENT)
195                 return -ENODEV;
196         switch (psp) {
197         case POWER_SUPPLY_PROP_STATUS:
198                 if (battery->state & 0x01)
199                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
200                 else if (battery->state & 0x02)
201                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
202                 else if (acpi_battery_is_charged(battery))
203                         val->intval = POWER_SUPPLY_STATUS_FULL;
204                 else
205                         val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
206                 break;
207         case POWER_SUPPLY_PROP_PRESENT:
208                 val->intval = acpi_battery_present(battery);
209                 break;
210         case POWER_SUPPLY_PROP_TECHNOLOGY:
211                 val->intval = acpi_battery_technology(battery);
212                 break;
213         case POWER_SUPPLY_PROP_CYCLE_COUNT:
214                 val->intval = battery->cycle_count;
215                 break;
216         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
217                 val->intval = battery->design_voltage * 1000;
218                 break;
219         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
220                 val->intval = battery->voltage_now * 1000;
221                 break;
222         case POWER_SUPPLY_PROP_CURRENT_NOW:
223         case POWER_SUPPLY_PROP_POWER_NOW:
224                 val->intval = battery->rate_now * 1000;
225                 break;
226         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
227         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
228                 val->intval = battery->design_capacity * 1000;
229                 break;
230         case POWER_SUPPLY_PROP_CHARGE_FULL:
231         case POWER_SUPPLY_PROP_ENERGY_FULL:
232                 val->intval = battery->full_charge_capacity * 1000;
233                 break;
234         case POWER_SUPPLY_PROP_CHARGE_NOW:
235         case POWER_SUPPLY_PROP_ENERGY_NOW:
236                 val->intval = battery->capacity_now * 1000;
237                 break;
238         case POWER_SUPPLY_PROP_MODEL_NAME:
239                 val->strval = battery->model_number;
240                 break;
241         case POWER_SUPPLY_PROP_MANUFACTURER:
242                 val->strval = battery->oem_info;
243                 break;
244         case POWER_SUPPLY_PROP_SERIAL_NUMBER:
245                 val->strval = battery->serial_number;
246                 break;
247         default:
248                 return -EINVAL;
249         }
250         return 0;
251 }
252
253 static enum power_supply_property charge_battery_props[] = {
254         POWER_SUPPLY_PROP_STATUS,
255         POWER_SUPPLY_PROP_PRESENT,
256         POWER_SUPPLY_PROP_TECHNOLOGY,
257         POWER_SUPPLY_PROP_CYCLE_COUNT,
258         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
259         POWER_SUPPLY_PROP_VOLTAGE_NOW,
260         POWER_SUPPLY_PROP_CURRENT_NOW,
261         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
262         POWER_SUPPLY_PROP_CHARGE_FULL,
263         POWER_SUPPLY_PROP_CHARGE_NOW,
264         POWER_SUPPLY_PROP_MODEL_NAME,
265         POWER_SUPPLY_PROP_MANUFACTURER,
266         POWER_SUPPLY_PROP_SERIAL_NUMBER,
267 };
268
269 static enum power_supply_property energy_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_POWER_NOW,
278         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
279         POWER_SUPPLY_PROP_ENERGY_FULL,
280         POWER_SUPPLY_PROP_ENERGY_NOW,
281         POWER_SUPPLY_PROP_MODEL_NAME,
282         POWER_SUPPLY_PROP_MANUFACTURER,
283         POWER_SUPPLY_PROP_SERIAL_NUMBER,
284 };
285 #endif
286
287 #ifdef CONFIG_ACPI_PROCFS_POWER
288 inline char *acpi_battery_units(struct acpi_battery *battery)
289 {
290         return (battery->power_unit)?"mA":"mW";
291 }
292 #endif
293
294 /* --------------------------------------------------------------------------
295                                Battery Management
296    -------------------------------------------------------------------------- */
297 struct acpi_offsets {
298         size_t offset;          /* offset inside struct acpi_sbs_battery */
299         u8 mode;                /* int or string? */
300 };
301
302 static struct acpi_offsets state_offsets[] = {
303         {offsetof(struct acpi_battery, state), 0},
304         {offsetof(struct acpi_battery, rate_now), 0},
305         {offsetof(struct acpi_battery, capacity_now), 0},
306         {offsetof(struct acpi_battery, voltage_now), 0},
307 };
308
309 static struct acpi_offsets info_offsets[] = {
310         {offsetof(struct acpi_battery, power_unit), 0},
311         {offsetof(struct acpi_battery, design_capacity), 0},
312         {offsetof(struct acpi_battery, full_charge_capacity), 0},
313         {offsetof(struct acpi_battery, technology), 0},
314         {offsetof(struct acpi_battery, design_voltage), 0},
315         {offsetof(struct acpi_battery, design_capacity_warning), 0},
316         {offsetof(struct acpi_battery, design_capacity_low), 0},
317         {offsetof(struct acpi_battery, capacity_granularity_1), 0},
318         {offsetof(struct acpi_battery, capacity_granularity_2), 0},
319         {offsetof(struct acpi_battery, model_number), 1},
320         {offsetof(struct acpi_battery, serial_number), 1},
321         {offsetof(struct acpi_battery, type), 1},
322         {offsetof(struct acpi_battery, oem_info), 1},
323 };
324
325 static struct acpi_offsets extended_info_offsets[] = {
326         {offsetof(struct acpi_battery, power_unit), 0},
327         {offsetof(struct acpi_battery, design_capacity), 0},
328         {offsetof(struct acpi_battery, full_charge_capacity), 0},
329         {offsetof(struct acpi_battery, technology), 0},
330         {offsetof(struct acpi_battery, design_voltage), 0},
331         {offsetof(struct acpi_battery, design_capacity_warning), 0},
332         {offsetof(struct acpi_battery, design_capacity_low), 0},
333         {offsetof(struct acpi_battery, cycle_count), 0},
334         {offsetof(struct acpi_battery, measurement_accuracy), 0},
335         {offsetof(struct acpi_battery, max_sampling_time), 0},
336         {offsetof(struct acpi_battery, min_sampling_time), 0},
337         {offsetof(struct acpi_battery, max_averaging_interval), 0},
338         {offsetof(struct acpi_battery, min_averaging_interval), 0},
339         {offsetof(struct acpi_battery, capacity_granularity_1), 0},
340         {offsetof(struct acpi_battery, capacity_granularity_2), 0},
341         {offsetof(struct acpi_battery, model_number), 1},
342         {offsetof(struct acpi_battery, serial_number), 1},
343         {offsetof(struct acpi_battery, type), 1},
344         {offsetof(struct acpi_battery, oem_info), 1},
345 };
346
347 static int extract_package(struct acpi_battery *battery,
348                            union acpi_object *package,
349                            struct acpi_offsets *offsets, int num)
350 {
351         int i;
352         union acpi_object *element;
353         if (package->type != ACPI_TYPE_PACKAGE)
354                 return -EFAULT;
355         for (i = 0; i < num; ++i) {
356                 if (package->package.count <= i)
357                         return -EFAULT;
358                 element = &package->package.elements[i];
359                 if (offsets[i].mode) {
360                         u8 *ptr = (u8 *)battery + offsets[i].offset;
361                         if (element->type == ACPI_TYPE_STRING ||
362                             element->type == ACPI_TYPE_BUFFER)
363                                 strncpy(ptr, element->string.pointer, 32);
364                         else if (element->type == ACPI_TYPE_INTEGER) {
365                                 strncpy(ptr, (u8 *)&element->integer.value,
366                                         sizeof(u64));
367                                 ptr[sizeof(u64)] = 0;
368                         } else
369                                 *ptr = 0; /* don't have value */
370                 } else {
371                         int *x = (int *)((u8 *)battery + offsets[i].offset);
372                         *x = (element->type == ACPI_TYPE_INTEGER) ?
373                                 element->integer.value : -1;
374                 }
375         }
376         return 0;
377 }
378
379 static int acpi_battery_get_status(struct acpi_battery *battery)
380 {
381         if (acpi_bus_get_status(battery->device)) {
382                 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
383                 return -ENODEV;
384         }
385         return 0;
386 }
387
388 static int acpi_battery_get_info(struct acpi_battery *battery)
389 {
390         int result = -EFAULT;
391         acpi_status status = 0;
392         char *name = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags)?
393                         "_BIX" : "_BIF";
394
395         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
396
397         if (!acpi_battery_present(battery))
398                 return 0;
399         mutex_lock(&battery->lock);
400         status = acpi_evaluate_object(battery->device->handle, name,
401                                                 NULL, &buffer);
402         mutex_unlock(&battery->lock);
403
404         if (ACPI_FAILURE(status)) {
405                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating %s", name));
406                 return -ENODEV;
407         }
408         if (test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags))
409                 result = extract_package(battery, buffer.pointer,
410                                 extended_info_offsets,
411                                 ARRAY_SIZE(extended_info_offsets));
412         else
413                 result = extract_package(battery, buffer.pointer,
414                                 info_offsets, ARRAY_SIZE(info_offsets));
415         kfree(buffer.pointer);
416         return result;
417 }
418
419 static int acpi_battery_get_state(struct acpi_battery *battery)
420 {
421         int result = 0;
422         acpi_status status = 0;
423         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
424
425         if (!acpi_battery_present(battery))
426                 return 0;
427
428         if (battery->update_time &&
429             time_before(jiffies, battery->update_time +
430                         msecs_to_jiffies(cache_time)))
431                 return 0;
432
433         mutex_lock(&battery->lock);
434         status = acpi_evaluate_object(battery->device->handle, "_BST",
435                                       NULL, &buffer);
436         mutex_unlock(&battery->lock);
437
438         if (ACPI_FAILURE(status)) {
439                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
440                 return -ENODEV;
441         }
442
443         result = extract_package(battery, buffer.pointer,
444                                  state_offsets, ARRAY_SIZE(state_offsets));
445         battery->update_time = jiffies;
446         kfree(buffer.pointer);
447
448         if (test_bit(ACPI_BATTERY_QUIRK_SIGNED16_CURRENT, &battery->flags) &&
449             battery->rate_now != -1)
450                 battery->rate_now = abs((s16)battery->rate_now);
451
452         return result;
453 }
454
455 static int acpi_battery_set_alarm(struct acpi_battery *battery)
456 {
457         acpi_status status = 0;
458         union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
459         struct acpi_object_list arg_list = { 1, &arg0 };
460
461         if (!acpi_battery_present(battery) ||
462             !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
463                 return -ENODEV;
464
465         arg0.integer.value = battery->alarm;
466
467         mutex_lock(&battery->lock);
468         status = acpi_evaluate_object(battery->device->handle, "_BTP",
469                                  &arg_list, NULL);
470         mutex_unlock(&battery->lock);
471
472         if (ACPI_FAILURE(status))
473                 return -ENODEV;
474
475         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
476         return 0;
477 }
478
479 static int acpi_battery_init_alarm(struct acpi_battery *battery)
480 {
481         acpi_status status = AE_OK;
482         acpi_handle handle = NULL;
483
484         /* See if alarms are supported, and if so, set default */
485         status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
486         if (ACPI_FAILURE(status)) {
487                 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
488                 return 0;
489         }
490         set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
491         if (!battery->alarm)
492                 battery->alarm = battery->design_capacity_warning;
493         return acpi_battery_set_alarm(battery);
494 }
495
496 #ifdef CONFIG_ACPI_SYSFS_POWER
497 static ssize_t acpi_battery_alarm_show(struct device *dev,
498                                         struct device_attribute *attr,
499                                         char *buf)
500 {
501         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
502         return sprintf(buf, "%d\n", battery->alarm * 1000);
503 }
504
505 static ssize_t acpi_battery_alarm_store(struct device *dev,
506                                         struct device_attribute *attr,
507                                         const char *buf, size_t count)
508 {
509         unsigned long x;
510         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
511         if (sscanf(buf, "%ld\n", &x) == 1)
512                 battery->alarm = x/1000;
513         if (acpi_battery_present(battery))
514                 acpi_battery_set_alarm(battery);
515         return count;
516 }
517
518 static struct device_attribute alarm_attr = {
519         .attr = {.name = "alarm", .mode = 0644},
520         .show = acpi_battery_alarm_show,
521         .store = acpi_battery_alarm_store,
522 };
523
524 static int sysfs_add_battery(struct acpi_battery *battery)
525 {
526         int result;
527
528         if (battery->power_unit) {
529                 battery->bat.properties = charge_battery_props;
530                 battery->bat.num_properties =
531                         ARRAY_SIZE(charge_battery_props);
532         } else {
533                 battery->bat.properties = energy_battery_props;
534                 battery->bat.num_properties =
535                         ARRAY_SIZE(energy_battery_props);
536         }
537
538         battery->bat.name = acpi_device_bid(battery->device);
539         battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
540         battery->bat.get_property = acpi_battery_get_property;
541
542         result = power_supply_register(&battery->device->dev, &battery->bat);
543         if (result)
544                 return result;
545         return device_create_file(battery->bat.dev, &alarm_attr);
546 }
547
548 static void sysfs_remove_battery(struct acpi_battery *battery)
549 {
550         if (!battery->bat.dev)
551                 return;
552         device_remove_file(battery->bat.dev, &alarm_attr);
553         power_supply_unregister(&battery->bat);
554         battery->bat.dev = NULL;
555 }
556 #endif
557
558 static void acpi_battery_quirks(struct acpi_battery *battery)
559 {
560         if (dmi_name_in_vendors("Acer") && battery->power_unit) {
561                 set_bit(ACPI_BATTERY_QUIRK_SIGNED16_CURRENT, &battery->flags);
562         }
563 }
564
565 static int acpi_battery_update(struct acpi_battery *battery)
566 {
567         int result, old_present = acpi_battery_present(battery);
568         result = acpi_battery_get_status(battery);
569         if (result)
570                 return result;
571 #ifdef CONFIG_ACPI_SYSFS_POWER
572         if (!acpi_battery_present(battery)) {
573                 sysfs_remove_battery(battery);
574                 battery->update_time = 0;
575                 return 0;
576         }
577 #endif
578         if (!battery->update_time ||
579             old_present != acpi_battery_present(battery)) {
580                 result = acpi_battery_get_info(battery);
581                 if (result)
582                         return result;
583                 acpi_battery_quirks(battery);
584                 acpi_battery_init_alarm(battery);
585         }
586 #ifdef CONFIG_ACPI_SYSFS_POWER
587         if (!battery->bat.dev)
588                 sysfs_add_battery(battery);
589 #endif
590         return acpi_battery_get_state(battery);
591 }
592
593 /* --------------------------------------------------------------------------
594                               FS Interface (/proc)
595    -------------------------------------------------------------------------- */
596
597 #ifdef CONFIG_ACPI_PROCFS_POWER
598 static struct proc_dir_entry *acpi_battery_dir;
599
600 static int acpi_battery_print_info(struct seq_file *seq, int result)
601 {
602         struct acpi_battery *battery = seq->private;
603
604         if (result)
605                 goto end;
606
607         seq_printf(seq, "present:                 %s\n",
608                    acpi_battery_present(battery)?"yes":"no");
609         if (!acpi_battery_present(battery))
610                 goto end;
611         if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
612                 seq_printf(seq, "design capacity:         unknown\n");
613         else
614                 seq_printf(seq, "design capacity:         %d %sh\n",
615                            battery->design_capacity,
616                            acpi_battery_units(battery));
617
618         if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
619                 seq_printf(seq, "last full capacity:      unknown\n");
620         else
621                 seq_printf(seq, "last full capacity:      %d %sh\n",
622                            battery->full_charge_capacity,
623                            acpi_battery_units(battery));
624
625         seq_printf(seq, "battery technology:      %srechargeable\n",
626                    (!battery->technology)?"non-":"");
627
628         if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
629                 seq_printf(seq, "design voltage:          unknown\n");
630         else
631                 seq_printf(seq, "design voltage:          %d mV\n",
632                            battery->design_voltage);
633         seq_printf(seq, "design capacity warning: %d %sh\n",
634                    battery->design_capacity_warning,
635                    acpi_battery_units(battery));
636         seq_printf(seq, "design capacity low:     %d %sh\n",
637                    battery->design_capacity_low,
638                    acpi_battery_units(battery));
639         seq_printf(seq, "cycle count:             %i\n", battery->cycle_count);
640         seq_printf(seq, "capacity granularity 1:  %d %sh\n",
641                    battery->capacity_granularity_1,
642                    acpi_battery_units(battery));
643         seq_printf(seq, "capacity granularity 2:  %d %sh\n",
644                    battery->capacity_granularity_2,
645                    acpi_battery_units(battery));
646         seq_printf(seq, "model number:            %s\n", battery->model_number);
647         seq_printf(seq, "serial number:           %s\n", battery->serial_number);
648         seq_printf(seq, "battery type:            %s\n", battery->type);
649         seq_printf(seq, "OEM info:                %s\n", battery->oem_info);
650       end:
651         if (result)
652                 seq_printf(seq, "ERROR: Unable to read battery info\n");
653         return result;
654 }
655
656 static int acpi_battery_print_state(struct seq_file *seq, int result)
657 {
658         struct acpi_battery *battery = seq->private;
659
660         if (result)
661                 goto end;
662
663         seq_printf(seq, "present:                 %s\n",
664                    acpi_battery_present(battery)?"yes":"no");
665         if (!acpi_battery_present(battery))
666                 goto end;
667
668         seq_printf(seq, "capacity state:          %s\n",
669                         (battery->state & 0x04)?"critical":"ok");
670         if ((battery->state & 0x01) && (battery->state & 0x02))
671                 seq_printf(seq,
672                            "charging state:          charging/discharging\n");
673         else if (battery->state & 0x01)
674                 seq_printf(seq, "charging state:          discharging\n");
675         else if (battery->state & 0x02)
676                 seq_printf(seq, "charging state:          charging\n");
677         else
678                 seq_printf(seq, "charging state:          charged\n");
679
680         if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
681                 seq_printf(seq, "present rate:            unknown\n");
682         else
683                 seq_printf(seq, "present rate:            %d %s\n",
684                            battery->rate_now, acpi_battery_units(battery));
685
686         if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
687                 seq_printf(seq, "remaining capacity:      unknown\n");
688         else
689                 seq_printf(seq, "remaining capacity:      %d %sh\n",
690                            battery->capacity_now, acpi_battery_units(battery));
691         if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
692                 seq_printf(seq, "present voltage:         unknown\n");
693         else
694                 seq_printf(seq, "present voltage:         %d mV\n",
695                            battery->voltage_now);
696       end:
697         if (result)
698                 seq_printf(seq, "ERROR: Unable to read battery state\n");
699
700         return result;
701 }
702
703 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
704 {
705         struct acpi_battery *battery = seq->private;
706
707         if (result)
708                 goto end;
709
710         if (!acpi_battery_present(battery)) {
711                 seq_printf(seq, "present:                 no\n");
712                 goto end;
713         }
714         seq_printf(seq, "alarm:                   ");
715         if (!battery->alarm)
716                 seq_printf(seq, "unsupported\n");
717         else
718                 seq_printf(seq, "%u %sh\n", battery->alarm,
719                                 acpi_battery_units(battery));
720       end:
721         if (result)
722                 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
723         return result;
724 }
725
726 static ssize_t acpi_battery_write_alarm(struct file *file,
727                                         const char __user * buffer,
728                                         size_t count, loff_t * ppos)
729 {
730         int result = 0;
731         char alarm_string[12] = { '\0' };
732         struct seq_file *m = file->private_data;
733         struct acpi_battery *battery = m->private;
734
735         if (!battery || (count > sizeof(alarm_string) - 1))
736                 return -EINVAL;
737         if (!acpi_battery_present(battery)) {
738                 result = -ENODEV;
739                 goto end;
740         }
741         if (copy_from_user(alarm_string, buffer, count)) {
742                 result = -EFAULT;
743                 goto end;
744         }
745         alarm_string[count] = '\0';
746         battery->alarm = simple_strtol(alarm_string, NULL, 0);
747         result = acpi_battery_set_alarm(battery);
748       end:
749         if (!result)
750                 return count;
751         return result;
752 }
753
754 typedef int(*print_func)(struct seq_file *seq, int result);
755
756 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
757         acpi_battery_print_info,
758         acpi_battery_print_state,
759         acpi_battery_print_alarm,
760 };
761
762 static int acpi_battery_read(int fid, struct seq_file *seq)
763 {
764         struct acpi_battery *battery = seq->private;
765         int result = acpi_battery_update(battery);
766         return acpi_print_funcs[fid](seq, result);
767 }
768
769 #define DECLARE_FILE_FUNCTIONS(_name) \
770 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
771 { \
772         return acpi_battery_read(_name##_tag, seq); \
773 } \
774 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
775 { \
776         return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
777 }
778
779 DECLARE_FILE_FUNCTIONS(info);
780 DECLARE_FILE_FUNCTIONS(state);
781 DECLARE_FILE_FUNCTIONS(alarm);
782
783 #undef DECLARE_FILE_FUNCTIONS
784
785 #define FILE_DESCRIPTION_RO(_name) \
786         { \
787         .name = __stringify(_name), \
788         .mode = S_IRUGO, \
789         .ops = { \
790                 .open = acpi_battery_##_name##_open_fs, \
791                 .read = seq_read, \
792                 .llseek = seq_lseek, \
793                 .release = single_release, \
794                 .owner = THIS_MODULE, \
795                 }, \
796         }
797
798 #define FILE_DESCRIPTION_RW(_name) \
799         { \
800         .name = __stringify(_name), \
801         .mode = S_IFREG | S_IRUGO | S_IWUSR, \
802         .ops = { \
803                 .open = acpi_battery_##_name##_open_fs, \
804                 .read = seq_read, \
805                 .llseek = seq_lseek, \
806                 .write = acpi_battery_write_##_name, \
807                 .release = single_release, \
808                 .owner = THIS_MODULE, \
809                 }, \
810         }
811
812 static struct battery_file {
813         struct file_operations ops;
814         mode_t mode;
815         const char *name;
816 } acpi_battery_file[] = {
817         FILE_DESCRIPTION_RO(info),
818         FILE_DESCRIPTION_RO(state),
819         FILE_DESCRIPTION_RW(alarm),
820 };
821
822 #undef FILE_DESCRIPTION_RO
823 #undef FILE_DESCRIPTION_RW
824
825 static int acpi_battery_add_fs(struct acpi_device *device)
826 {
827         struct proc_dir_entry *entry = NULL;
828         int i;
829
830         if (!acpi_device_dir(device)) {
831                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
832                                                      acpi_battery_dir);
833                 if (!acpi_device_dir(device))
834                         return -ENODEV;
835         }
836
837         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
838                 entry = proc_create_data(acpi_battery_file[i].name,
839                                          acpi_battery_file[i].mode,
840                                          acpi_device_dir(device),
841                                          &acpi_battery_file[i].ops,
842                                          acpi_driver_data(device));
843                 if (!entry)
844                         return -ENODEV;
845         }
846         return 0;
847 }
848
849 static void acpi_battery_remove_fs(struct acpi_device *device)
850 {
851         int i;
852         if (!acpi_device_dir(device))
853                 return;
854         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
855                 remove_proc_entry(acpi_battery_file[i].name,
856                                   acpi_device_dir(device));
857
858         remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
859         acpi_device_dir(device) = NULL;
860 }
861
862 #endif
863
864 /* --------------------------------------------------------------------------
865                                  Driver Interface
866    -------------------------------------------------------------------------- */
867
868 static void acpi_battery_notify(struct acpi_device *device, u32 event)
869 {
870         struct acpi_battery *battery = acpi_driver_data(device);
871
872         if (!battery)
873                 return;
874         acpi_battery_update(battery);
875         acpi_bus_generate_proc_event(device, event,
876                                      acpi_battery_present(battery));
877         acpi_bus_generate_netlink_event(device->pnp.device_class,
878                                         dev_name(&device->dev), event,
879                                         acpi_battery_present(battery));
880 #ifdef CONFIG_ACPI_SYSFS_POWER
881         /* acpi_battery_update could remove power_supply object */
882         if (battery->bat.dev)
883                 kobject_uevent(&battery->bat.dev->kobj, KOBJ_CHANGE);
884 #endif
885 }
886
887 static int acpi_battery_add(struct acpi_device *device)
888 {
889         int result = 0;
890         struct acpi_battery *battery = NULL;
891         acpi_handle handle;
892         if (!device)
893                 return -EINVAL;
894         battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
895         if (!battery)
896                 return -ENOMEM;
897         battery->device = device;
898         strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
899         strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
900         device->driver_data = battery;
901         mutex_init(&battery->lock);
902         if (ACPI_SUCCESS(acpi_get_handle(battery->device->handle,
903                         "_BIX", &handle)))
904                 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
905         acpi_battery_update(battery);
906 #ifdef CONFIG_ACPI_PROCFS_POWER
907         result = acpi_battery_add_fs(device);
908 #endif
909         if (!result) {
910                 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
911                         ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
912                         device->status.battery_present ? "present" : "absent");
913         } else {
914 #ifdef CONFIG_ACPI_PROCFS_POWER
915                 acpi_battery_remove_fs(device);
916 #endif
917                 kfree(battery);
918         }
919         return result;
920 }
921
922 static int acpi_battery_remove(struct acpi_device *device, int type)
923 {
924         struct acpi_battery *battery = NULL;
925
926         if (!device || !acpi_driver_data(device))
927                 return -EINVAL;
928         battery = acpi_driver_data(device);
929 #ifdef CONFIG_ACPI_PROCFS_POWER
930         acpi_battery_remove_fs(device);
931 #endif
932 #ifdef CONFIG_ACPI_SYSFS_POWER
933         sysfs_remove_battery(battery);
934 #endif
935         mutex_destroy(&battery->lock);
936         kfree(battery);
937         return 0;
938 }
939
940 /* this is needed to learn about changes made in suspended state */
941 static int acpi_battery_resume(struct acpi_device *device)
942 {
943         struct acpi_battery *battery;
944         if (!device)
945                 return -EINVAL;
946         battery = acpi_driver_data(device);
947         battery->update_time = 0;
948         acpi_battery_update(battery);
949         return 0;
950 }
951
952 static struct acpi_driver acpi_battery_driver = {
953         .name = "battery",
954         .class = ACPI_BATTERY_CLASS,
955         .ids = battery_device_ids,
956         .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
957         .ops = {
958                 .add = acpi_battery_add,
959                 .resume = acpi_battery_resume,
960                 .remove = acpi_battery_remove,
961                 .notify = acpi_battery_notify,
962                 },
963 };
964
965 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
966 {
967         if (acpi_disabled)
968                 return;
969 #ifdef CONFIG_ACPI_PROCFS_POWER
970         acpi_battery_dir = acpi_lock_battery_dir();
971         if (!acpi_battery_dir)
972                 return;
973 #endif
974         if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
975 #ifdef CONFIG_ACPI_PROCFS_POWER
976                 acpi_unlock_battery_dir(acpi_battery_dir);
977 #endif
978                 return;
979         }
980         return;
981 }
982
983 static int __init acpi_battery_init(void)
984 {
985         async_schedule(acpi_battery_init_async, NULL);
986         return 0;
987 }
988
989 static void __exit acpi_battery_exit(void)
990 {
991         acpi_bus_unregister_driver(&acpi_battery_driver);
992 #ifdef CONFIG_ACPI_PROCFS_POWER
993         acpi_unlock_battery_dir(acpi_battery_dir);
994 #endif
995 }
996
997 module_init(acpi_battery_init);
998 module_exit(acpi_battery_exit);