Merge branches 'battery-2.6.34', 'bugzilla-10805', 'bugzilla-14668', 'bugzilla-531916...
[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
36 #ifdef CONFIG_ACPI_PROCFS_POWER
37 #include <linux/proc_fs.h>
38 #include <linux/seq_file.h>
39 #include <asm/uaccess.h>
40 #endif
41
42 #include <acpi/acpi_bus.h>
43 #include <acpi/acpi_drivers.h>
44
45 #ifdef CONFIG_ACPI_SYSFS_POWER
46 #include <linux/power_supply.h>
47 #endif
48
49 #define PREFIX "ACPI: "
50
51 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
52
53 #define ACPI_BATTERY_CLASS              "battery"
54 #define ACPI_BATTERY_DEVICE_NAME        "Battery"
55 #define ACPI_BATTERY_NOTIFY_STATUS      0x80
56 #define ACPI_BATTERY_NOTIFY_INFO        0x81
57 #define ACPI_BATTERY_NOTIFY_THRESHOLD   0x82
58
59 #define _COMPONENT              ACPI_BATTERY_COMPONENT
60
61 ACPI_MODULE_NAME("battery");
62
63 MODULE_AUTHOR("Paul Diefenbaugh");
64 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
65 MODULE_DESCRIPTION("ACPI Battery Driver");
66 MODULE_LICENSE("GPL");
67
68 static unsigned int cache_time = 1000;
69 module_param(cache_time, uint, 0644);
70 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
71
72 #ifdef CONFIG_ACPI_PROCFS_POWER
73 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
74 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
75
76 enum acpi_battery_files {
77         info_tag = 0,
78         state_tag,
79         alarm_tag,
80         ACPI_BATTERY_NUMFILES,
81 };
82
83 #endif
84
85 static const struct acpi_device_id battery_device_ids[] = {
86         {"PNP0C0A", 0},
87         {"", 0},
88 };
89
90 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
91
92 enum {
93         ACPI_BATTERY_ALARM_PRESENT,
94         ACPI_BATTERY_XINFO_PRESENT,
95         /* For buggy DSDTs that report negative 16-bit values for either
96          * charging or discharging current and/or report 0 as 65536
97          * due to bad math.
98          */
99         ACPI_BATTERY_QUIRK_SIGNED16_CURRENT,
100 };
101
102 struct acpi_battery {
103         struct mutex lock;
104 #ifdef CONFIG_ACPI_SYSFS_POWER
105         struct power_supply bat;
106 #endif
107         struct acpi_device *device;
108         unsigned long update_time;
109         int rate_now;
110         int capacity_now;
111         int voltage_now;
112         int design_capacity;
113         int full_charge_capacity;
114         int technology;
115         int design_voltage;
116         int design_capacity_warning;
117         int design_capacity_low;
118         int cycle_count;
119         int measurement_accuracy;
120         int max_sampling_time;
121         int min_sampling_time;
122         int max_averaging_interval;
123         int min_averaging_interval;
124         int capacity_granularity_1;
125         int capacity_granularity_2;
126         int alarm;
127         char model_number[32];
128         char serial_number[32];
129         char type[32];
130         char oem_info[32];
131         int state;
132         int power_unit;
133         unsigned long flags;
134 };
135
136 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
137
138 inline int acpi_battery_present(struct acpi_battery *battery)
139 {
140         return battery->device->status.battery_present;
141 }
142
143 #ifdef CONFIG_ACPI_SYSFS_POWER
144 static int acpi_battery_technology(struct acpi_battery *battery)
145 {
146         if (!strcasecmp("NiCd", battery->type))
147                 return POWER_SUPPLY_TECHNOLOGY_NiCd;
148         if (!strcasecmp("NiMH", battery->type))
149                 return POWER_SUPPLY_TECHNOLOGY_NiMH;
150         if (!strcasecmp("LION", battery->type))
151                 return POWER_SUPPLY_TECHNOLOGY_LION;
152         if (!strncasecmp("LI-ION", battery->type, 6))
153                 return POWER_SUPPLY_TECHNOLOGY_LION;
154         if (!strcasecmp("LiP", battery->type))
155                 return POWER_SUPPLY_TECHNOLOGY_LIPO;
156         return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
157 }
158
159 static int acpi_battery_get_state(struct acpi_battery *battery);
160
161 static int acpi_battery_is_charged(struct acpi_battery *battery)
162 {
163         /* either charging or discharging */
164         if (battery->state != 0)
165                 return 0;
166
167         /* battery not reporting charge */
168         if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
169             battery->capacity_now == 0)
170                 return 0;
171
172         /* good batteries update full_charge as the batteries degrade */
173         if (battery->full_charge_capacity == battery->capacity_now)
174                 return 1;
175
176         /* fallback to using design values for broken batteries */
177         if (battery->design_capacity == battery->capacity_now)
178                 return 1;
179
180         /* we don't do any sort of metric based on percentages */
181         return 0;
182 }
183
184 static int acpi_battery_get_property(struct power_supply *psy,
185                                      enum power_supply_property psp,
186                                      union power_supply_propval *val)
187 {
188         struct acpi_battery *battery = to_acpi_battery(psy);
189
190         if (acpi_battery_present(battery)) {
191                 /* run battery update only if it is present */
192                 acpi_battery_get_state(battery);
193         } else if (psp != POWER_SUPPLY_PROP_PRESENT)
194                 return -ENODEV;
195         switch (psp) {
196         case POWER_SUPPLY_PROP_STATUS:
197                 if (battery->state & 0x01)
198                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
199                 else if (battery->state & 0x02)
200                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
201                 else if (acpi_battery_is_charged(battery))
202                         val->intval = POWER_SUPPLY_STATUS_FULL;
203                 else
204                         val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
205                 break;
206         case POWER_SUPPLY_PROP_PRESENT:
207                 val->intval = acpi_battery_present(battery);
208                 break;
209         case POWER_SUPPLY_PROP_TECHNOLOGY:
210                 val->intval = acpi_battery_technology(battery);
211                 break;
212         case POWER_SUPPLY_PROP_CYCLE_COUNT:
213                 val->intval = battery->cycle_count;
214                 break;
215         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
216                 val->intval = battery->design_voltage * 1000;
217                 break;
218         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
219                 val->intval = battery->voltage_now * 1000;
220                 break;
221         case POWER_SUPPLY_PROP_CURRENT_NOW:
222         case POWER_SUPPLY_PROP_POWER_NOW:
223                 val->intval = battery->rate_now * 1000;
224                 break;
225         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
226         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
227                 val->intval = battery->design_capacity * 1000;
228                 break;
229         case POWER_SUPPLY_PROP_CHARGE_FULL:
230         case POWER_SUPPLY_PROP_ENERGY_FULL:
231                 val->intval = battery->full_charge_capacity * 1000;
232                 break;
233         case POWER_SUPPLY_PROP_CHARGE_NOW:
234         case POWER_SUPPLY_PROP_ENERGY_NOW:
235                 val->intval = battery->capacity_now * 1000;
236                 break;
237         case POWER_SUPPLY_PROP_MODEL_NAME:
238                 val->strval = battery->model_number;
239                 break;
240         case POWER_SUPPLY_PROP_MANUFACTURER:
241                 val->strval = battery->oem_info;
242                 break;
243         case POWER_SUPPLY_PROP_SERIAL_NUMBER:
244                 val->strval = battery->serial_number;
245                 break;
246         default:
247                 return -EINVAL;
248         }
249         return 0;
250 }
251
252 static enum power_supply_property charge_battery_props[] = {
253         POWER_SUPPLY_PROP_STATUS,
254         POWER_SUPPLY_PROP_PRESENT,
255         POWER_SUPPLY_PROP_TECHNOLOGY,
256         POWER_SUPPLY_PROP_CYCLE_COUNT,
257         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
258         POWER_SUPPLY_PROP_VOLTAGE_NOW,
259         POWER_SUPPLY_PROP_CURRENT_NOW,
260         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
261         POWER_SUPPLY_PROP_CHARGE_FULL,
262         POWER_SUPPLY_PROP_CHARGE_NOW,
263         POWER_SUPPLY_PROP_MODEL_NAME,
264         POWER_SUPPLY_PROP_MANUFACTURER,
265         POWER_SUPPLY_PROP_SERIAL_NUMBER,
266 };
267
268 static enum power_supply_property energy_battery_props[] = {
269         POWER_SUPPLY_PROP_STATUS,
270         POWER_SUPPLY_PROP_PRESENT,
271         POWER_SUPPLY_PROP_TECHNOLOGY,
272         POWER_SUPPLY_PROP_CYCLE_COUNT,
273         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
274         POWER_SUPPLY_PROP_VOLTAGE_NOW,
275         POWER_SUPPLY_PROP_CURRENT_NOW,
276         POWER_SUPPLY_PROP_POWER_NOW,
277         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
278         POWER_SUPPLY_PROP_ENERGY_FULL,
279         POWER_SUPPLY_PROP_ENERGY_NOW,
280         POWER_SUPPLY_PROP_MODEL_NAME,
281         POWER_SUPPLY_PROP_MANUFACTURER,
282         POWER_SUPPLY_PROP_SERIAL_NUMBER,
283 };
284 #endif
285
286 #ifdef CONFIG_ACPI_PROCFS_POWER
287 inline char *acpi_battery_units(struct acpi_battery *battery)
288 {
289         return (battery->power_unit)?"mA":"mW";
290 }
291 #endif
292
293 /* --------------------------------------------------------------------------
294                                Battery Management
295    -------------------------------------------------------------------------- */
296 struct acpi_offsets {
297         size_t offset;          /* offset inside struct acpi_sbs_battery */
298         u8 mode;                /* int or string? */
299 };
300
301 static struct acpi_offsets state_offsets[] = {
302         {offsetof(struct acpi_battery, state), 0},
303         {offsetof(struct acpi_battery, rate_now), 0},
304         {offsetof(struct acpi_battery, capacity_now), 0},
305         {offsetof(struct acpi_battery, voltage_now), 0},
306 };
307
308 static struct acpi_offsets info_offsets[] = {
309         {offsetof(struct acpi_battery, power_unit), 0},
310         {offsetof(struct acpi_battery, design_capacity), 0},
311         {offsetof(struct acpi_battery, full_charge_capacity), 0},
312         {offsetof(struct acpi_battery, technology), 0},
313         {offsetof(struct acpi_battery, design_voltage), 0},
314         {offsetof(struct acpi_battery, design_capacity_warning), 0},
315         {offsetof(struct acpi_battery, design_capacity_low), 0},
316         {offsetof(struct acpi_battery, capacity_granularity_1), 0},
317         {offsetof(struct acpi_battery, capacity_granularity_2), 0},
318         {offsetof(struct acpi_battery, model_number), 1},
319         {offsetof(struct acpi_battery, serial_number), 1},
320         {offsetof(struct acpi_battery, type), 1},
321         {offsetof(struct acpi_battery, oem_info), 1},
322 };
323
324 static struct acpi_offsets extended_info_offsets[] = {
325         {offsetof(struct acpi_battery, power_unit), 0},
326         {offsetof(struct acpi_battery, design_capacity), 0},
327         {offsetof(struct acpi_battery, full_charge_capacity), 0},
328         {offsetof(struct acpi_battery, technology), 0},
329         {offsetof(struct acpi_battery, design_voltage), 0},
330         {offsetof(struct acpi_battery, design_capacity_warning), 0},
331         {offsetof(struct acpi_battery, design_capacity_low), 0},
332         {offsetof(struct acpi_battery, cycle_count), 0},
333         {offsetof(struct acpi_battery, measurement_accuracy), 0},
334         {offsetof(struct acpi_battery, max_sampling_time), 0},
335         {offsetof(struct acpi_battery, min_sampling_time), 0},
336         {offsetof(struct acpi_battery, max_averaging_interval), 0},
337         {offsetof(struct acpi_battery, min_averaging_interval), 0},
338         {offsetof(struct acpi_battery, capacity_granularity_1), 0},
339         {offsetof(struct acpi_battery, capacity_granularity_2), 0},
340         {offsetof(struct acpi_battery, model_number), 1},
341         {offsetof(struct acpi_battery, serial_number), 1},
342         {offsetof(struct acpi_battery, type), 1},
343         {offsetof(struct acpi_battery, oem_info), 1},
344 };
345
346 static int extract_package(struct acpi_battery *battery,
347                            union acpi_object *package,
348                            struct acpi_offsets *offsets, int num)
349 {
350         int i;
351         union acpi_object *element;
352         if (package->type != ACPI_TYPE_PACKAGE)
353                 return -EFAULT;
354         for (i = 0; i < num; ++i) {
355                 if (package->package.count <= i)
356                         return -EFAULT;
357                 element = &package->package.elements[i];
358                 if (offsets[i].mode) {
359                         u8 *ptr = (u8 *)battery + offsets[i].offset;
360                         if (element->type == ACPI_TYPE_STRING ||
361                             element->type == ACPI_TYPE_BUFFER)
362                                 strncpy(ptr, element->string.pointer, 32);
363                         else if (element->type == ACPI_TYPE_INTEGER) {
364                                 strncpy(ptr, (u8 *)&element->integer.value,
365                                         sizeof(u64));
366                                 ptr[sizeof(u64)] = 0;
367                         } else
368                                 *ptr = 0; /* don't have value */
369                 } else {
370                         int *x = (int *)((u8 *)battery + offsets[i].offset);
371                         *x = (element->type == ACPI_TYPE_INTEGER) ?
372                                 element->integer.value : -1;
373                 }
374         }
375         return 0;
376 }
377
378 static int acpi_battery_get_status(struct acpi_battery *battery)
379 {
380         if (acpi_bus_get_status(battery->device)) {
381                 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
382                 return -ENODEV;
383         }
384         return 0;
385 }
386
387 static int acpi_battery_get_info(struct acpi_battery *battery)
388 {
389         int result = -EFAULT;
390         acpi_status status = 0;
391         char *name = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags)?
392                         "_BIX" : "_BIF";
393
394         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
395
396         if (!acpi_battery_present(battery))
397                 return 0;
398         mutex_lock(&battery->lock);
399         status = acpi_evaluate_object(battery->device->handle, name,
400                                                 NULL, &buffer);
401         mutex_unlock(&battery->lock);
402
403         if (ACPI_FAILURE(status)) {
404                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating %s", name));
405                 return -ENODEV;
406         }
407         if (test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags))
408                 result = extract_package(battery, buffer.pointer,
409                                 extended_info_offsets,
410                                 ARRAY_SIZE(extended_info_offsets));
411         else
412                 result = extract_package(battery, buffer.pointer,
413                                 info_offsets, ARRAY_SIZE(info_offsets));
414         kfree(buffer.pointer);
415         return result;
416 }
417
418 static int acpi_battery_get_state(struct acpi_battery *battery)
419 {
420         int result = 0;
421         acpi_status status = 0;
422         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
423
424         if (!acpi_battery_present(battery))
425                 return 0;
426
427         if (battery->update_time &&
428             time_before(jiffies, battery->update_time +
429                         msecs_to_jiffies(cache_time)))
430                 return 0;
431
432         mutex_lock(&battery->lock);
433         status = acpi_evaluate_object(battery->device->handle, "_BST",
434                                       NULL, &buffer);
435         mutex_unlock(&battery->lock);
436
437         if (ACPI_FAILURE(status)) {
438                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
439                 return -ENODEV;
440         }
441
442         result = extract_package(battery, buffer.pointer,
443                                  state_offsets, ARRAY_SIZE(state_offsets));
444         battery->update_time = jiffies;
445         kfree(buffer.pointer);
446
447         if (test_bit(ACPI_BATTERY_QUIRK_SIGNED16_CURRENT, &battery->flags) &&
448             battery->rate_now != -1)
449                 battery->rate_now = abs((s16)battery->rate_now);
450
451         return result;
452 }
453
454 static int acpi_battery_set_alarm(struct acpi_battery *battery)
455 {
456         acpi_status status = 0;
457         union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
458         struct acpi_object_list arg_list = { 1, &arg0 };
459
460         if (!acpi_battery_present(battery) ||
461             !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
462                 return -ENODEV;
463
464         arg0.integer.value = battery->alarm;
465
466         mutex_lock(&battery->lock);
467         status = acpi_evaluate_object(battery->device->handle, "_BTP",
468                                  &arg_list, NULL);
469         mutex_unlock(&battery->lock);
470
471         if (ACPI_FAILURE(status))
472                 return -ENODEV;
473
474         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
475         return 0;
476 }
477
478 static int acpi_battery_init_alarm(struct acpi_battery *battery)
479 {
480         acpi_status status = AE_OK;
481         acpi_handle handle = NULL;
482
483         /* See if alarms are supported, and if so, set default */
484         status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
485         if (ACPI_FAILURE(status)) {
486                 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
487                 return 0;
488         }
489         set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
490         if (!battery->alarm)
491                 battery->alarm = battery->design_capacity_warning;
492         return acpi_battery_set_alarm(battery);
493 }
494
495 #ifdef CONFIG_ACPI_SYSFS_POWER
496 static ssize_t acpi_battery_alarm_show(struct device *dev,
497                                         struct device_attribute *attr,
498                                         char *buf)
499 {
500         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
501         return sprintf(buf, "%d\n", battery->alarm * 1000);
502 }
503
504 static ssize_t acpi_battery_alarm_store(struct device *dev,
505                                         struct device_attribute *attr,
506                                         const char *buf, size_t count)
507 {
508         unsigned long x;
509         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
510         if (sscanf(buf, "%ld\n", &x) == 1)
511                 battery->alarm = x/1000;
512         if (acpi_battery_present(battery))
513                 acpi_battery_set_alarm(battery);
514         return count;
515 }
516
517 static struct device_attribute alarm_attr = {
518         .attr = {.name = "alarm", .mode = 0644},
519         .show = acpi_battery_alarm_show,
520         .store = acpi_battery_alarm_store,
521 };
522
523 static int sysfs_add_battery(struct acpi_battery *battery)
524 {
525         int result;
526
527         if (battery->power_unit) {
528                 battery->bat.properties = charge_battery_props;
529                 battery->bat.num_properties =
530                         ARRAY_SIZE(charge_battery_props);
531         } else {
532                 battery->bat.properties = energy_battery_props;
533                 battery->bat.num_properties =
534                         ARRAY_SIZE(energy_battery_props);
535         }
536
537         battery->bat.name = acpi_device_bid(battery->device);
538         battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
539         battery->bat.get_property = acpi_battery_get_property;
540
541         result = power_supply_register(&battery->device->dev, &battery->bat);
542         if (result)
543                 return result;
544         return device_create_file(battery->bat.dev, &alarm_attr);
545 }
546
547 static void sysfs_remove_battery(struct acpi_battery *battery)
548 {
549         if (!battery->bat.dev)
550                 return;
551         device_remove_file(battery->bat.dev, &alarm_attr);
552         power_supply_unregister(&battery->bat);
553         battery->bat.dev = NULL;
554 }
555 #endif
556
557 static void acpi_battery_quirks(struct acpi_battery *battery)
558 {
559         if (dmi_name_in_vendors("Acer") && battery->power_unit) {
560                 set_bit(ACPI_BATTERY_QUIRK_SIGNED16_CURRENT, &battery->flags);
561         }
562 }
563
564 static int acpi_battery_update(struct acpi_battery *battery)
565 {
566         int result, old_present = acpi_battery_present(battery);
567         result = acpi_battery_get_status(battery);
568         if (result)
569                 return result;
570 #ifdef CONFIG_ACPI_SYSFS_POWER
571         if (!acpi_battery_present(battery)) {
572                 sysfs_remove_battery(battery);
573                 battery->update_time = 0;
574                 return 0;
575         }
576 #endif
577         if (!battery->update_time ||
578             old_present != acpi_battery_present(battery)) {
579                 result = acpi_battery_get_info(battery);
580                 if (result)
581                         return result;
582                 acpi_battery_quirks(battery);
583                 acpi_battery_init_alarm(battery);
584         }
585 #ifdef CONFIG_ACPI_SYSFS_POWER
586         if (!battery->bat.dev)
587                 sysfs_add_battery(battery);
588 #endif
589         return acpi_battery_get_state(battery);
590 }
591
592 /* --------------------------------------------------------------------------
593                               FS Interface (/proc)
594    -------------------------------------------------------------------------- */
595
596 #ifdef CONFIG_ACPI_PROCFS_POWER
597 static struct proc_dir_entry *acpi_battery_dir;
598
599 static int acpi_battery_print_info(struct seq_file *seq, int result)
600 {
601         struct acpi_battery *battery = seq->private;
602
603         if (result)
604                 goto end;
605
606         seq_printf(seq, "present:                 %s\n",
607                    acpi_battery_present(battery)?"yes":"no");
608         if (!acpi_battery_present(battery))
609                 goto end;
610         if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
611                 seq_printf(seq, "design capacity:         unknown\n");
612         else
613                 seq_printf(seq, "design capacity:         %d %sh\n",
614                            battery->design_capacity,
615                            acpi_battery_units(battery));
616
617         if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
618                 seq_printf(seq, "last full capacity:      unknown\n");
619         else
620                 seq_printf(seq, "last full capacity:      %d %sh\n",
621                            battery->full_charge_capacity,
622                            acpi_battery_units(battery));
623
624         seq_printf(seq, "battery technology:      %srechargeable\n",
625                    (!battery->technology)?"non-":"");
626
627         if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
628                 seq_printf(seq, "design voltage:          unknown\n");
629         else
630                 seq_printf(seq, "design voltage:          %d mV\n",
631                            battery->design_voltage);
632         seq_printf(seq, "design capacity warning: %d %sh\n",
633                    battery->design_capacity_warning,
634                    acpi_battery_units(battery));
635         seq_printf(seq, "design capacity low:     %d %sh\n",
636                    battery->design_capacity_low,
637                    acpi_battery_units(battery));
638         seq_printf(seq, "cycle count:             %i\n", battery->cycle_count);
639         seq_printf(seq, "capacity granularity 1:  %d %sh\n",
640                    battery->capacity_granularity_1,
641                    acpi_battery_units(battery));
642         seq_printf(seq, "capacity granularity 2:  %d %sh\n",
643                    battery->capacity_granularity_2,
644                    acpi_battery_units(battery));
645         seq_printf(seq, "model number:            %s\n", battery->model_number);
646         seq_printf(seq, "serial number:           %s\n", battery->serial_number);
647         seq_printf(seq, "battery type:            %s\n", battery->type);
648         seq_printf(seq, "OEM info:                %s\n", battery->oem_info);
649       end:
650         if (result)
651                 seq_printf(seq, "ERROR: Unable to read battery info\n");
652         return result;
653 }
654
655 static int acpi_battery_print_state(struct seq_file *seq, int result)
656 {
657         struct acpi_battery *battery = seq->private;
658
659         if (result)
660                 goto end;
661
662         seq_printf(seq, "present:                 %s\n",
663                    acpi_battery_present(battery)?"yes":"no");
664         if (!acpi_battery_present(battery))
665                 goto end;
666
667         seq_printf(seq, "capacity state:          %s\n",
668                         (battery->state & 0x04)?"critical":"ok");
669         if ((battery->state & 0x01) && (battery->state & 0x02))
670                 seq_printf(seq,
671                            "charging state:          charging/discharging\n");
672         else if (battery->state & 0x01)
673                 seq_printf(seq, "charging state:          discharging\n");
674         else if (battery->state & 0x02)
675                 seq_printf(seq, "charging state:          charging\n");
676         else
677                 seq_printf(seq, "charging state:          charged\n");
678
679         if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
680                 seq_printf(seq, "present rate:            unknown\n");
681         else
682                 seq_printf(seq, "present rate:            %d %s\n",
683                            battery->rate_now, acpi_battery_units(battery));
684
685         if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
686                 seq_printf(seq, "remaining capacity:      unknown\n");
687         else
688                 seq_printf(seq, "remaining capacity:      %d %sh\n",
689                            battery->capacity_now, acpi_battery_units(battery));
690         if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
691                 seq_printf(seq, "present voltage:         unknown\n");
692         else
693                 seq_printf(seq, "present voltage:         %d mV\n",
694                            battery->voltage_now);
695       end:
696         if (result)
697                 seq_printf(seq, "ERROR: Unable to read battery state\n");
698
699         return result;
700 }
701
702 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
703 {
704         struct acpi_battery *battery = seq->private;
705
706         if (result)
707                 goto end;
708
709         if (!acpi_battery_present(battery)) {
710                 seq_printf(seq, "present:                 no\n");
711                 goto end;
712         }
713         seq_printf(seq, "alarm:                   ");
714         if (!battery->alarm)
715                 seq_printf(seq, "unsupported\n");
716         else
717                 seq_printf(seq, "%u %sh\n", battery->alarm,
718                                 acpi_battery_units(battery));
719       end:
720         if (result)
721                 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
722         return result;
723 }
724
725 static ssize_t acpi_battery_write_alarm(struct file *file,
726                                         const char __user * buffer,
727                                         size_t count, loff_t * ppos)
728 {
729         int result = 0;
730         char alarm_string[12] = { '\0' };
731         struct seq_file *m = file->private_data;
732         struct acpi_battery *battery = m->private;
733
734         if (!battery || (count > sizeof(alarm_string) - 1))
735                 return -EINVAL;
736         if (!acpi_battery_present(battery)) {
737                 result = -ENODEV;
738                 goto end;
739         }
740         if (copy_from_user(alarm_string, buffer, count)) {
741                 result = -EFAULT;
742                 goto end;
743         }
744         alarm_string[count] = '\0';
745         battery->alarm = simple_strtol(alarm_string, NULL, 0);
746         result = acpi_battery_set_alarm(battery);
747       end:
748         if (!result)
749                 return count;
750         return result;
751 }
752
753 typedef int(*print_func)(struct seq_file *seq, int result);
754
755 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
756         acpi_battery_print_info,
757         acpi_battery_print_state,
758         acpi_battery_print_alarm,
759 };
760
761 static int acpi_battery_read(int fid, struct seq_file *seq)
762 {
763         struct acpi_battery *battery = seq->private;
764         int result = acpi_battery_update(battery);
765         return acpi_print_funcs[fid](seq, result);
766 }
767
768 #define DECLARE_FILE_FUNCTIONS(_name) \
769 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
770 { \
771         return acpi_battery_read(_name##_tag, seq); \
772 } \
773 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
774 { \
775         return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
776 }
777
778 DECLARE_FILE_FUNCTIONS(info);
779 DECLARE_FILE_FUNCTIONS(state);
780 DECLARE_FILE_FUNCTIONS(alarm);
781
782 #undef DECLARE_FILE_FUNCTIONS
783
784 #define FILE_DESCRIPTION_RO(_name) \
785         { \
786         .name = __stringify(_name), \
787         .mode = S_IRUGO, \
788         .ops = { \
789                 .open = acpi_battery_##_name##_open_fs, \
790                 .read = seq_read, \
791                 .llseek = seq_lseek, \
792                 .release = single_release, \
793                 .owner = THIS_MODULE, \
794                 }, \
795         }
796
797 #define FILE_DESCRIPTION_RW(_name) \
798         { \
799         .name = __stringify(_name), \
800         .mode = S_IFREG | S_IRUGO | S_IWUSR, \
801         .ops = { \
802                 .open = acpi_battery_##_name##_open_fs, \
803                 .read = seq_read, \
804                 .llseek = seq_lseek, \
805                 .write = acpi_battery_write_##_name, \
806                 .release = single_release, \
807                 .owner = THIS_MODULE, \
808                 }, \
809         }
810
811 static struct battery_file {
812         struct file_operations ops;
813         mode_t mode;
814         const char *name;
815 } acpi_battery_file[] = {
816         FILE_DESCRIPTION_RO(info),
817         FILE_DESCRIPTION_RO(state),
818         FILE_DESCRIPTION_RW(alarm),
819 };
820
821 #undef FILE_DESCRIPTION_RO
822 #undef FILE_DESCRIPTION_RW
823
824 static int acpi_battery_add_fs(struct acpi_device *device)
825 {
826         struct proc_dir_entry *entry = NULL;
827         int i;
828
829         if (!acpi_device_dir(device)) {
830                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
831                                                      acpi_battery_dir);
832                 if (!acpi_device_dir(device))
833                         return -ENODEV;
834         }
835
836         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
837                 entry = proc_create_data(acpi_battery_file[i].name,
838                                          acpi_battery_file[i].mode,
839                                          acpi_device_dir(device),
840                                          &acpi_battery_file[i].ops,
841                                          acpi_driver_data(device));
842                 if (!entry)
843                         return -ENODEV;
844         }
845         return 0;
846 }
847
848 static void acpi_battery_remove_fs(struct acpi_device *device)
849 {
850         int i;
851         if (!acpi_device_dir(device))
852                 return;
853         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
854                 remove_proc_entry(acpi_battery_file[i].name,
855                                   acpi_device_dir(device));
856
857         remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
858         acpi_device_dir(device) = NULL;
859 }
860
861 #endif
862
863 /* --------------------------------------------------------------------------
864                                  Driver Interface
865    -------------------------------------------------------------------------- */
866
867 static void acpi_battery_notify(struct acpi_device *device, u32 event)
868 {
869         struct acpi_battery *battery = acpi_driver_data(device);
870
871         if (!battery)
872                 return;
873         acpi_battery_update(battery);
874         acpi_bus_generate_proc_event(device, event,
875                                      acpi_battery_present(battery));
876         acpi_bus_generate_netlink_event(device->pnp.device_class,
877                                         dev_name(&device->dev), event,
878                                         acpi_battery_present(battery));
879 #ifdef CONFIG_ACPI_SYSFS_POWER
880         /* acpi_battery_update could remove power_supply object */
881         if (battery->bat.dev)
882                 kobject_uevent(&battery->bat.dev->kobj, KOBJ_CHANGE);
883 #endif
884 }
885
886 static int acpi_battery_add(struct acpi_device *device)
887 {
888         int result = 0;
889         struct acpi_battery *battery = NULL;
890         acpi_handle handle;
891         if (!device)
892                 return -EINVAL;
893         battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
894         if (!battery)
895                 return -ENOMEM;
896         battery->device = device;
897         strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
898         strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
899         device->driver_data = battery;
900         mutex_init(&battery->lock);
901         if (ACPI_SUCCESS(acpi_get_handle(battery->device->handle,
902                         "_BIX", &handle)))
903                 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
904         acpi_battery_update(battery);
905 #ifdef CONFIG_ACPI_PROCFS_POWER
906         result = acpi_battery_add_fs(device);
907 #endif
908         if (!result) {
909                 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
910                         ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
911                         device->status.battery_present ? "present" : "absent");
912         } else {
913 #ifdef CONFIG_ACPI_PROCFS_POWER
914                 acpi_battery_remove_fs(device);
915 #endif
916                 kfree(battery);
917         }
918         return result;
919 }
920
921 static int acpi_battery_remove(struct acpi_device *device, int type)
922 {
923         struct acpi_battery *battery = NULL;
924
925         if (!device || !acpi_driver_data(device))
926                 return -EINVAL;
927         battery = acpi_driver_data(device);
928 #ifdef CONFIG_ACPI_PROCFS_POWER
929         acpi_battery_remove_fs(device);
930 #endif
931 #ifdef CONFIG_ACPI_SYSFS_POWER
932         sysfs_remove_battery(battery);
933 #endif
934         mutex_destroy(&battery->lock);
935         kfree(battery);
936         return 0;
937 }
938
939 /* this is needed to learn about changes made in suspended state */
940 static int acpi_battery_resume(struct acpi_device *device)
941 {
942         struct acpi_battery *battery;
943         if (!device)
944                 return -EINVAL;
945         battery = acpi_driver_data(device);
946         battery->update_time = 0;
947         acpi_battery_update(battery);
948         return 0;
949 }
950
951 static struct acpi_driver acpi_battery_driver = {
952         .name = "battery",
953         .class = ACPI_BATTERY_CLASS,
954         .ids = battery_device_ids,
955         .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
956         .ops = {
957                 .add = acpi_battery_add,
958                 .resume = acpi_battery_resume,
959                 .remove = acpi_battery_remove,
960                 .notify = acpi_battery_notify,
961                 },
962 };
963
964 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
965 {
966         if (acpi_disabled)
967                 return;
968 #ifdef CONFIG_ACPI_PROCFS_POWER
969         acpi_battery_dir = acpi_lock_battery_dir();
970         if (!acpi_battery_dir)
971                 return;
972 #endif
973         if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
974 #ifdef CONFIG_ACPI_PROCFS_POWER
975                 acpi_unlock_battery_dir(acpi_battery_dir);
976 #endif
977                 return;
978         }
979         return;
980 }
981
982 static int __init acpi_battery_init(void)
983 {
984         async_schedule(acpi_battery_init_async, NULL);
985         return 0;
986 }
987
988 static void __exit acpi_battery_exit(void)
989 {
990         acpi_bus_unregister_driver(&acpi_battery_driver);
991 #ifdef CONFIG_ACPI_PROCFS_POWER
992         acpi_unlock_battery_dir(acpi_battery_dir);
993 #endif
994 }
995
996 module_init(acpi_battery_init);
997 module_exit(acpi_battery_exit);