Pull battery into release branch
[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
34 #ifdef CONFIG_ACPI_PROCFS
35 #include <linux/proc_fs.h>
36 #include <linux/seq_file.h>
37 #include <asm/uaccess.h>
38 #endif
39
40 #include <acpi/acpi_bus.h>
41 #include <acpi/acpi_drivers.h>
42
43 #include <linux/power_supply.h>
44
45 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
46
47 #define ACPI_BATTERY_COMPONENT          0x00040000
48 #define ACPI_BATTERY_CLASS              "battery"
49 #define ACPI_BATTERY_DEVICE_NAME        "Battery"
50 #define ACPI_BATTERY_NOTIFY_STATUS      0x80
51 #define ACPI_BATTERY_NOTIFY_INFO        0x81
52
53 #define _COMPONENT              ACPI_BATTERY_COMPONENT
54
55 ACPI_MODULE_NAME("battery");
56
57 MODULE_AUTHOR("Paul Diefenbaugh");
58 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
59 MODULE_DESCRIPTION("ACPI Battery Driver");
60 MODULE_LICENSE("GPL");
61
62 static unsigned int cache_time = 1000;
63 module_param(cache_time, uint, 0644);
64 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
65
66 #ifdef CONFIG_ACPI_PROCFS
67 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
68 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
69
70 enum acpi_battery_files {
71         info_tag = 0,
72         state_tag,
73         alarm_tag,
74         ACPI_BATTERY_NUMFILES,
75 };
76
77 #endif
78
79 static const struct acpi_device_id battery_device_ids[] = {
80         {"PNP0C0A", 0},
81         {"", 0},
82 };
83
84 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
85
86
87 struct acpi_battery {
88         struct mutex lock;
89         struct power_supply bat;
90         struct acpi_device *device;
91         unsigned long update_time;
92         int current_now;
93         int capacity_now;
94         int voltage_now;
95         int design_capacity;
96         int full_charge_capacity;
97         int technology;
98         int design_voltage;
99         int design_capacity_warning;
100         int design_capacity_low;
101         int capacity_granularity_1;
102         int capacity_granularity_2;
103         int alarm;
104         char model_number[32];
105         char serial_number[32];
106         char type[32];
107         char oem_info[32];
108         int state;
109         int power_unit;
110         u8 alarm_present;
111 };
112
113 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
114
115 inline int acpi_battery_present(struct acpi_battery *battery)
116 {
117         return battery->device->status.battery_present;
118 }
119
120 static int acpi_battery_technology(struct acpi_battery *battery)
121 {
122         if (!strcasecmp("NiCd", battery->type))
123                 return POWER_SUPPLY_TECHNOLOGY_NiCd;
124         if (!strcasecmp("NiMH", battery->type))
125                 return POWER_SUPPLY_TECHNOLOGY_NiMH;
126         if (!strcasecmp("LION", battery->type))
127                 return POWER_SUPPLY_TECHNOLOGY_LION;
128         if (!strcasecmp("LI-ION", battery->type))
129                 return POWER_SUPPLY_TECHNOLOGY_LION;
130         if (!strcasecmp("LiP", battery->type))
131                 return POWER_SUPPLY_TECHNOLOGY_LIPO;
132         return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
133 }
134
135 static int acpi_battery_get_state(struct acpi_battery *battery);
136
137 static int acpi_battery_get_property(struct power_supply *psy,
138                                      enum power_supply_property psp,
139                                      union power_supply_propval *val)
140 {
141         struct acpi_battery *battery = to_acpi_battery(psy);
142
143         if (acpi_battery_present(battery)) {
144                 /* run battery update only if it is present */
145                 acpi_battery_get_state(battery);
146         } else if (psp != POWER_SUPPLY_PROP_PRESENT)
147                 return -ENODEV;
148         switch (psp) {
149         case POWER_SUPPLY_PROP_STATUS:
150                 if (battery->state & 0x01)
151                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
152                 else if (battery->state & 0x02)
153                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
154                 else if (battery->state == 0)
155                         val->intval = POWER_SUPPLY_STATUS_FULL;
156                 else
157                         val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
158                 break;
159         case POWER_SUPPLY_PROP_PRESENT:
160                 val->intval = acpi_battery_present(battery);
161                 break;
162         case POWER_SUPPLY_PROP_TECHNOLOGY:
163                 val->intval = acpi_battery_technology(battery);
164                 break;
165         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
166                 val->intval = battery->design_voltage * 1000;
167                 break;
168         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
169                 val->intval = battery->voltage_now * 1000;
170                 break;
171         case POWER_SUPPLY_PROP_CURRENT_NOW:
172                 val->intval = battery->current_now * 1000;
173                 break;
174         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
175         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
176                 val->intval = battery->design_capacity * 1000;
177                 break;
178         case POWER_SUPPLY_PROP_CHARGE_FULL:
179         case POWER_SUPPLY_PROP_ENERGY_FULL:
180                 val->intval = battery->full_charge_capacity * 1000;
181                 break;
182         case POWER_SUPPLY_PROP_CHARGE_NOW:
183         case POWER_SUPPLY_PROP_ENERGY_NOW:
184                 val->intval = battery->capacity_now * 1000;
185                 break;
186         case POWER_SUPPLY_PROP_MODEL_NAME:
187                 val->strval = battery->model_number;
188                 break;
189         case POWER_SUPPLY_PROP_MANUFACTURER:
190                 val->strval = battery->oem_info;
191                 break;
192         default:
193                 return -EINVAL;
194         }
195         return 0;
196 }
197
198 static enum power_supply_property charge_battery_props[] = {
199         POWER_SUPPLY_PROP_STATUS,
200         POWER_SUPPLY_PROP_PRESENT,
201         POWER_SUPPLY_PROP_TECHNOLOGY,
202         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
203         POWER_SUPPLY_PROP_VOLTAGE_NOW,
204         POWER_SUPPLY_PROP_CURRENT_NOW,
205         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
206         POWER_SUPPLY_PROP_CHARGE_FULL,
207         POWER_SUPPLY_PROP_CHARGE_NOW,
208         POWER_SUPPLY_PROP_MODEL_NAME,
209         POWER_SUPPLY_PROP_MANUFACTURER,
210 };
211
212 static enum power_supply_property energy_battery_props[] = {
213         POWER_SUPPLY_PROP_STATUS,
214         POWER_SUPPLY_PROP_PRESENT,
215         POWER_SUPPLY_PROP_TECHNOLOGY,
216         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
217         POWER_SUPPLY_PROP_VOLTAGE_NOW,
218         POWER_SUPPLY_PROP_CURRENT_NOW,
219         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
220         POWER_SUPPLY_PROP_ENERGY_FULL,
221         POWER_SUPPLY_PROP_ENERGY_NOW,
222         POWER_SUPPLY_PROP_MODEL_NAME,
223         POWER_SUPPLY_PROP_MANUFACTURER,
224 };
225
226 #ifdef CONFIG_ACPI_PROCFS
227 inline char *acpi_battery_units(struct acpi_battery *battery)
228 {
229         return (battery->power_unit)?"mA":"mW";
230 }
231 #endif
232
233 /* --------------------------------------------------------------------------
234                                Battery Management
235    -------------------------------------------------------------------------- */
236 struct acpi_offsets {
237         size_t offset;          /* offset inside struct acpi_sbs_battery */
238         u8 mode;                /* int or string? */
239 };
240
241 static struct acpi_offsets state_offsets[] = {
242         {offsetof(struct acpi_battery, state), 0},
243         {offsetof(struct acpi_battery, current_now), 0},
244         {offsetof(struct acpi_battery, capacity_now), 0},
245         {offsetof(struct acpi_battery, voltage_now), 0},
246 };
247
248 static struct acpi_offsets info_offsets[] = {
249         {offsetof(struct acpi_battery, power_unit), 0},
250         {offsetof(struct acpi_battery, design_capacity), 0},
251         {offsetof(struct acpi_battery, full_charge_capacity), 0},
252         {offsetof(struct acpi_battery, technology), 0},
253         {offsetof(struct acpi_battery, design_voltage), 0},
254         {offsetof(struct acpi_battery, design_capacity_warning), 0},
255         {offsetof(struct acpi_battery, design_capacity_low), 0},
256         {offsetof(struct acpi_battery, capacity_granularity_1), 0},
257         {offsetof(struct acpi_battery, capacity_granularity_2), 0},
258         {offsetof(struct acpi_battery, model_number), 1},
259         {offsetof(struct acpi_battery, serial_number), 1},
260         {offsetof(struct acpi_battery, type), 1},
261         {offsetof(struct acpi_battery, oem_info), 1},
262 };
263
264 static int extract_package(struct acpi_battery *battery,
265                            union acpi_object *package,
266                            struct acpi_offsets *offsets, int num)
267 {
268         int i;
269         union acpi_object *element;
270         if (package->type != ACPI_TYPE_PACKAGE)
271                 return -EFAULT;
272         for (i = 0; i < num; ++i) {
273                 if (package->package.count <= i)
274                         return -EFAULT;
275                 element = &package->package.elements[i];
276                 if (offsets[i].mode) {
277                         u8 *ptr = (u8 *)battery + offsets[i].offset;
278                         if (element->type == ACPI_TYPE_STRING ||
279                             element->type == ACPI_TYPE_BUFFER)
280                                 strncpy(ptr, element->string.pointer, 32);
281                         else if (element->type == ACPI_TYPE_INTEGER) {
282                                 strncpy(ptr, (u8 *)&element->integer.value,
283                                         sizeof(acpi_integer));
284                                 ptr[sizeof(acpi_integer)] = 0;
285                         } else return -EFAULT;
286                 } else {
287                         if (element->type == ACPI_TYPE_INTEGER) {
288                                 int *x = (int *)((u8 *)battery +
289                                                 offsets[i].offset);
290                                 *x = element->integer.value;
291                         } else return -EFAULT;
292                 }
293         }
294         return 0;
295 }
296
297 static int acpi_battery_get_status(struct acpi_battery *battery)
298 {
299         if (acpi_bus_get_status(battery->device)) {
300                 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
301                 return -ENODEV;
302         }
303         return 0;
304 }
305
306 static int acpi_battery_get_info(struct acpi_battery *battery)
307 {
308         int result = -EFAULT;
309         acpi_status status = 0;
310         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
311
312         if (!acpi_battery_present(battery))
313                 return 0;
314         mutex_lock(&battery->lock);
315         status = acpi_evaluate_object(battery->device->handle, "_BIF",
316                                       NULL, &buffer);
317         mutex_unlock(&battery->lock);
318
319         if (ACPI_FAILURE(status)) {
320                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BIF"));
321                 return -ENODEV;
322         }
323
324         result = extract_package(battery, buffer.pointer,
325                                  info_offsets, ARRAY_SIZE(info_offsets));
326         kfree(buffer.pointer);
327         return result;
328 }
329
330 static int acpi_battery_get_state(struct acpi_battery *battery)
331 {
332         int result = 0;
333         acpi_status status = 0;
334         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
335
336         if (!acpi_battery_present(battery))
337                 return 0;
338
339         if (battery->update_time &&
340             time_before(jiffies, battery->update_time +
341                         msecs_to_jiffies(cache_time)))
342                 return 0;
343
344         mutex_lock(&battery->lock);
345         status = acpi_evaluate_object(battery->device->handle, "_BST",
346                                       NULL, &buffer);
347         mutex_unlock(&battery->lock);
348
349         if (ACPI_FAILURE(status)) {
350                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
351                 return -ENODEV;
352         }
353
354         result = extract_package(battery, buffer.pointer,
355                                  state_offsets, ARRAY_SIZE(state_offsets));
356         battery->update_time = jiffies;
357         kfree(buffer.pointer);
358         return result;
359 }
360
361 static int acpi_battery_set_alarm(struct acpi_battery *battery)
362 {
363         acpi_status status = 0;
364         union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
365         struct acpi_object_list arg_list = { 1, &arg0 };
366
367         if (!acpi_battery_present(battery)|| !battery->alarm_present)
368                 return -ENODEV;
369
370         arg0.integer.value = battery->alarm;
371
372         mutex_lock(&battery->lock);
373         status = acpi_evaluate_object(battery->device->handle, "_BTP",
374                                  &arg_list, NULL);
375         mutex_unlock(&battery->lock);
376
377         if (ACPI_FAILURE(status))
378                 return -ENODEV;
379
380         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
381         return 0;
382 }
383
384 static int acpi_battery_init_alarm(struct acpi_battery *battery)
385 {
386         acpi_status status = AE_OK;
387         acpi_handle handle = NULL;
388
389         /* See if alarms are supported, and if so, set default */
390         status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
391         if (ACPI_FAILURE(status)) {
392                 battery->alarm_present = 0;
393                 return 0;
394         }
395         battery->alarm_present = 1;
396         if (!battery->alarm)
397                 battery->alarm = battery->design_capacity_warning;
398         return acpi_battery_set_alarm(battery);
399 }
400
401 static ssize_t acpi_battery_alarm_show(struct device *dev,
402                                         struct device_attribute *attr,
403                                         char *buf)
404 {
405         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
406         return sprintf(buf, "%d\n", battery->alarm * 1000);
407 }
408
409 static ssize_t acpi_battery_alarm_store(struct device *dev,
410                                         struct device_attribute *attr,
411                                         const char *buf, size_t count)
412 {
413         unsigned long x;
414         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
415         if (sscanf(buf, "%ld\n", &x) == 1)
416                 battery->alarm = x/1000;
417         if (acpi_battery_present(battery))
418                 acpi_battery_set_alarm(battery);
419         return count;
420 }
421
422 static struct device_attribute alarm_attr = {
423         .attr = {.name = "alarm", .mode = 0644, .owner = THIS_MODULE},
424         .show = acpi_battery_alarm_show,
425         .store = acpi_battery_alarm_store,
426 };
427
428 static int sysfs_add_battery(struct acpi_battery *battery)
429 {
430         int result;
431
432         battery->update_time = 0;
433         result = acpi_battery_get_info(battery);
434         acpi_battery_init_alarm(battery);
435         if (result)
436                 return result;
437         if (battery->power_unit) {
438                 battery->bat.properties = charge_battery_props;
439                 battery->bat.num_properties =
440                         ARRAY_SIZE(charge_battery_props);
441         } else {
442                 battery->bat.properties = energy_battery_props;
443                 battery->bat.num_properties =
444                         ARRAY_SIZE(energy_battery_props);
445         }
446
447         battery->bat.name = acpi_device_bid(battery->device);
448         battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
449         battery->bat.get_property = acpi_battery_get_property;
450
451         result = power_supply_register(&battery->device->dev, &battery->bat);
452         if (result)
453                 return result;
454         return device_create_file(battery->bat.dev, &alarm_attr);
455 }
456
457 static void sysfs_remove_battery(struct acpi_battery *battery)
458 {
459         if (!battery->bat.dev)
460                 return;
461         device_remove_file(battery->bat.dev, &alarm_attr);
462         power_supply_unregister(&battery->bat);
463         battery->bat.dev = NULL;
464 }
465
466 static int acpi_battery_update(struct acpi_battery *battery)
467 {
468         int result = acpi_battery_get_status(battery);
469         if (result)
470                 return result;
471         if (!acpi_battery_present(battery)) {
472                 sysfs_remove_battery(battery);
473                 return 0;
474         }
475         if (!battery->bat.dev)
476                 sysfs_add_battery(battery);
477         return acpi_battery_get_state(battery);
478 }
479
480 /* --------------------------------------------------------------------------
481                               FS Interface (/proc)
482    -------------------------------------------------------------------------- */
483
484 #ifdef CONFIG_ACPI_PROCFS
485 static struct proc_dir_entry *acpi_battery_dir;
486
487 static int acpi_battery_print_info(struct seq_file *seq, int result)
488 {
489         struct acpi_battery *battery = seq->private;
490
491         if (result)
492                 goto end;
493
494         seq_printf(seq, "present:                 %s\n",
495                    acpi_battery_present(battery)?"yes":"no");
496         if (!acpi_battery_present(battery))
497                 goto end;
498         if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
499                 seq_printf(seq, "design capacity:         unknown\n");
500         else
501                 seq_printf(seq, "design capacity:         %d %sh\n",
502                            battery->design_capacity,
503                            acpi_battery_units(battery));
504
505         if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
506                 seq_printf(seq, "last full capacity:      unknown\n");
507         else
508                 seq_printf(seq, "last full capacity:      %d %sh\n",
509                            battery->full_charge_capacity,
510                            acpi_battery_units(battery));
511
512         seq_printf(seq, "battery technology:      %srechargeable\n",
513                    (!battery->technology)?"non-":"");
514
515         if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
516                 seq_printf(seq, "design voltage:          unknown\n");
517         else
518                 seq_printf(seq, "design voltage:          %d mV\n",
519                            battery->design_voltage);
520         seq_printf(seq, "design capacity warning: %d %sh\n",
521                    battery->design_capacity_warning,
522                    acpi_battery_units(battery));
523         seq_printf(seq, "design capacity low:     %d %sh\n",
524                    battery->design_capacity_low,
525                    acpi_battery_units(battery));
526         seq_printf(seq, "capacity granularity 1:  %d %sh\n",
527                    battery->capacity_granularity_1,
528                    acpi_battery_units(battery));
529         seq_printf(seq, "capacity granularity 2:  %d %sh\n",
530                    battery->capacity_granularity_2,
531                    acpi_battery_units(battery));
532         seq_printf(seq, "model number:            %s\n", battery->model_number);
533         seq_printf(seq, "serial number:           %s\n", battery->serial_number);
534         seq_printf(seq, "battery type:            %s\n", battery->type);
535         seq_printf(seq, "OEM info:                %s\n", battery->oem_info);
536       end:
537         if (result)
538                 seq_printf(seq, "ERROR: Unable to read battery info\n");
539         return result;
540 }
541
542 static int acpi_battery_print_state(struct seq_file *seq, int result)
543 {
544         struct acpi_battery *battery = seq->private;
545
546         if (result)
547                 goto end;
548
549         seq_printf(seq, "present:                 %s\n",
550                    acpi_battery_present(battery)?"yes":"no");
551         if (!acpi_battery_present(battery))
552                 goto end;
553
554         seq_printf(seq, "capacity state:          %s\n",
555                         (battery->state & 0x04)?"critical":"ok");
556         if ((battery->state & 0x01) && (battery->state & 0x02))
557                 seq_printf(seq,
558                            "charging state:          charging/discharging\n");
559         else if (battery->state & 0x01)
560                 seq_printf(seq, "charging state:          discharging\n");
561         else if (battery->state & 0x02)
562                 seq_printf(seq, "charging state:          charging\n");
563         else
564                 seq_printf(seq, "charging state:          charged\n");
565
566         if (battery->current_now == ACPI_BATTERY_VALUE_UNKNOWN)
567                 seq_printf(seq, "present rate:            unknown\n");
568         else
569                 seq_printf(seq, "present rate:            %d %s\n",
570                            battery->current_now, acpi_battery_units(battery));
571
572         if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
573                 seq_printf(seq, "remaining capacity:      unknown\n");
574         else
575                 seq_printf(seq, "remaining capacity:      %d %sh\n",
576                            battery->capacity_now, acpi_battery_units(battery));
577         if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
578                 seq_printf(seq, "present voltage:         unknown\n");
579         else
580                 seq_printf(seq, "present voltage:         %d mV\n",
581                            battery->voltage_now);
582       end:
583         if (result)
584                 seq_printf(seq, "ERROR: Unable to read battery state\n");
585
586         return result;
587 }
588
589 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
590 {
591         struct acpi_battery *battery = seq->private;
592
593         if (result)
594                 goto end;
595
596         if (!acpi_battery_present(battery)) {
597                 seq_printf(seq, "present:                 no\n");
598                 goto end;
599         }
600         seq_printf(seq, "alarm:                   ");
601         if (!battery->alarm)
602                 seq_printf(seq, "unsupported\n");
603         else
604                 seq_printf(seq, "%u %sh\n", battery->alarm,
605                                 acpi_battery_units(battery));
606       end:
607         if (result)
608                 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
609         return result;
610 }
611
612 static ssize_t acpi_battery_write_alarm(struct file *file,
613                                         const char __user * buffer,
614                                         size_t count, loff_t * ppos)
615 {
616         int result = 0;
617         char alarm_string[12] = { '\0' };
618         struct seq_file *m = file->private_data;
619         struct acpi_battery *battery = m->private;
620
621         if (!battery || (count > sizeof(alarm_string) - 1))
622                 return -EINVAL;
623         if (!acpi_battery_present(battery)) {
624                 result = -ENODEV;
625                 goto end;
626         }
627         if (copy_from_user(alarm_string, buffer, count)) {
628                 result = -EFAULT;
629                 goto end;
630         }
631         alarm_string[count] = '\0';
632         battery->alarm = simple_strtol(alarm_string, NULL, 0);
633         result = acpi_battery_set_alarm(battery);
634       end:
635         if (!result)
636                 return count;
637         return result;
638 }
639
640 typedef int(*print_func)(struct seq_file *seq, int result);
641
642 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
643         acpi_battery_print_info,
644         acpi_battery_print_state,
645         acpi_battery_print_alarm,
646 };
647
648 static int acpi_battery_read(int fid, struct seq_file *seq)
649 {
650         struct acpi_battery *battery = seq->private;
651         int result = acpi_battery_update(battery);
652         return acpi_print_funcs[fid](seq, result);
653 }
654
655 #define DECLARE_FILE_FUNCTIONS(_name) \
656 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
657 { \
658         return acpi_battery_read(_name##_tag, seq); \
659 } \
660 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
661 { \
662         return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
663 }
664
665 DECLARE_FILE_FUNCTIONS(info);
666 DECLARE_FILE_FUNCTIONS(state);
667 DECLARE_FILE_FUNCTIONS(alarm);
668
669 #undef DECLARE_FILE_FUNCTIONS
670
671 #define FILE_DESCRIPTION_RO(_name) \
672         { \
673         .name = __stringify(_name), \
674         .mode = S_IRUGO, \
675         .ops = { \
676                 .open = acpi_battery_##_name##_open_fs, \
677                 .read = seq_read, \
678                 .llseek = seq_lseek, \
679                 .release = single_release, \
680                 .owner = THIS_MODULE, \
681                 }, \
682         }
683
684 #define FILE_DESCRIPTION_RW(_name) \
685         { \
686         .name = __stringify(_name), \
687         .mode = S_IFREG | S_IRUGO | S_IWUSR, \
688         .ops = { \
689                 .open = acpi_battery_##_name##_open_fs, \
690                 .read = seq_read, \
691                 .llseek = seq_lseek, \
692                 .write = acpi_battery_write_##_name, \
693                 .release = single_release, \
694                 .owner = THIS_MODULE, \
695                 }, \
696         }
697
698 static struct battery_file {
699         struct file_operations ops;
700         mode_t mode;
701         char *name;
702 } acpi_battery_file[] = {
703         FILE_DESCRIPTION_RO(info),
704         FILE_DESCRIPTION_RO(state),
705         FILE_DESCRIPTION_RW(alarm),
706 };
707
708 #undef FILE_DESCRIPTION_RO
709 #undef FILE_DESCRIPTION_RW
710
711 static int acpi_battery_add_fs(struct acpi_device *device)
712 {
713         struct proc_dir_entry *entry = NULL;
714         int i;
715
716         if (!acpi_device_dir(device)) {
717                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
718                                                      acpi_battery_dir);
719                 if (!acpi_device_dir(device))
720                         return -ENODEV;
721                 acpi_device_dir(device)->owner = THIS_MODULE;
722         }
723
724         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
725                 entry = create_proc_entry(acpi_battery_file[i].name,
726                                   acpi_battery_file[i].mode, acpi_device_dir(device));
727                 if (!entry)
728                         return -ENODEV;
729                 else {
730                         entry->proc_fops = &acpi_battery_file[i].ops;
731                         entry->data = acpi_driver_data(device);
732                         entry->owner = THIS_MODULE;
733                 }
734         }
735         return 0;
736 }
737
738 static void acpi_battery_remove_fs(struct acpi_device *device)
739 {
740         int i;
741         if (!acpi_device_dir(device))
742                 return;
743         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
744                 remove_proc_entry(acpi_battery_file[i].name,
745                                   acpi_device_dir(device));
746
747         remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
748         acpi_device_dir(device) = NULL;
749 }
750
751 #endif
752
753 /* --------------------------------------------------------------------------
754                                  Driver Interface
755    -------------------------------------------------------------------------- */
756
757 static void acpi_battery_notify(acpi_handle handle, u32 event, void *data)
758 {
759         struct acpi_battery *battery = data;
760         struct acpi_device *device;
761         if (!battery)
762                 return;
763         device = battery->device;
764         acpi_battery_update(battery);
765         acpi_bus_generate_proc_event(device, event,
766                                      acpi_battery_present(battery));
767         acpi_bus_generate_netlink_event(device->pnp.device_class,
768                                         device->dev.bus_id, event,
769                                         acpi_battery_present(battery));
770         /* acpi_batter_update could remove power_supply object */
771         if (battery->bat.dev)
772                 kobject_uevent(&battery->bat.dev->kobj, KOBJ_CHANGE);
773 }
774
775 static int acpi_battery_add(struct acpi_device *device)
776 {
777         int result = 0;
778         acpi_status status = 0;
779         struct acpi_battery *battery = NULL;
780         if (!device)
781                 return -EINVAL;
782         battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
783         if (!battery)
784                 return -ENOMEM;
785         battery->device = device;
786         strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
787         strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
788         acpi_driver_data(device) = battery;
789         mutex_init(&battery->lock);
790         acpi_battery_update(battery);
791 #ifdef CONFIG_ACPI_PROCFS
792         result = acpi_battery_add_fs(device);
793         if (result)
794                 goto end;
795 #endif
796         status = acpi_install_notify_handler(device->handle,
797                                              ACPI_ALL_NOTIFY,
798                                              acpi_battery_notify, battery);
799         if (ACPI_FAILURE(status)) {
800                 ACPI_EXCEPTION((AE_INFO, status, "Installing notify handler"));
801                 result = -ENODEV;
802                 goto end;
803         }
804         printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
805                ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
806                device->status.battery_present ? "present" : "absent");
807       end:
808         if (result) {
809 #ifdef CONFIG_ACPI_PROCFS
810                 acpi_battery_remove_fs(device);
811 #endif
812                 kfree(battery);
813         }
814         return result;
815 }
816
817 static int acpi_battery_remove(struct acpi_device *device, int type)
818 {
819         acpi_status status = 0;
820         struct acpi_battery *battery = NULL;
821
822         if (!device || !acpi_driver_data(device))
823                 return -EINVAL;
824         battery = acpi_driver_data(device);
825         status = acpi_remove_notify_handler(device->handle,
826                                             ACPI_ALL_NOTIFY,
827                                             acpi_battery_notify);
828 #ifdef CONFIG_ACPI_PROCFS
829         acpi_battery_remove_fs(device);
830 #endif
831         sysfs_remove_battery(battery);
832         mutex_destroy(&battery->lock);
833         kfree(battery);
834         return 0;
835 }
836
837 /* this is needed to learn about changes made in suspended state */
838 static int acpi_battery_resume(struct acpi_device *device)
839 {
840         struct acpi_battery *battery;
841         if (!device)
842                 return -EINVAL;
843         battery = acpi_driver_data(device);
844         battery->update_time = 0;
845         acpi_battery_update(battery);
846         return 0;
847 }
848
849 static struct acpi_driver acpi_battery_driver = {
850         .name = "battery",
851         .class = ACPI_BATTERY_CLASS,
852         .ids = battery_device_ids,
853         .ops = {
854                 .add = acpi_battery_add,
855                 .resume = acpi_battery_resume,
856                 .remove = acpi_battery_remove,
857                 },
858 };
859
860 static int __init acpi_battery_init(void)
861 {
862         if (acpi_disabled)
863                 return -ENODEV;
864 #ifdef CONFIG_ACPI_PROCFS
865         acpi_battery_dir = acpi_lock_battery_dir();
866         if (!acpi_battery_dir)
867                 return -ENODEV;
868 #endif
869         if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
870 #ifdef CONFIG_ACPI_PROCFS
871                 acpi_unlock_battery_dir(acpi_battery_dir);
872 #endif
873                 return -ENODEV;
874         }
875         return 0;
876 }
877
878 static void __exit acpi_battery_exit(void)
879 {
880         acpi_bus_unregister_driver(&acpi_battery_driver);
881 #ifdef CONFIG_ACPI_PROCFS
882         acpi_unlock_battery_dir(acpi_battery_dir);
883 #endif
884 }
885
886 module_init(acpi_battery_init);
887 module_exit(acpi_battery_exit);