2 * battery.c - ACPI Battery Driver (Revision: 2.0)
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>
9 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.
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.
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.
25 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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>
34 #ifdef CONFIG_ACPI_PROCFS
35 #include <linux/proc_fs.h>
36 #include <linux/seq_file.h>
37 #include <asm/uaccess.h>
40 #include <acpi/acpi_bus.h>
41 #include <acpi/acpi_drivers.h>
43 #include <linux/power_supply.h>
45 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
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
53 #define _COMPONENT ACPI_BATTERY_COMPONENT
55 ACPI_MODULE_NAME("battery");
57 MODULE_AUTHOR("Paul Diefenbaugh");
58 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
59 MODULE_DESCRIPTION("ACPI Battery Driver");
60 MODULE_LICENSE("GPL");
62 static unsigned int cache_time = 1000;
63 module_param(cache_time, uint, 0644);
64 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
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);
70 enum acpi_battery_files {
74 ACPI_BATTERY_NUMFILES,
79 static const struct acpi_device_id battery_device_ids[] = {
84 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
89 struct power_supply bat;
90 struct acpi_device *device;
91 unsigned long update_time;
96 int full_charge_capacity;
99 int design_capacity_warning;
100 int design_capacity_low;
101 int capacity_granularity_1;
102 int capacity_granularity_2;
104 char model_number[32];
105 char serial_number[32];
113 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
115 inline int acpi_battery_present(struct acpi_battery *battery)
117 return battery->device->status.battery_present;
120 static int acpi_battery_technology(struct acpi_battery *battery)
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("LiP", battery->type))
129 return POWER_SUPPLY_TECHNOLOGY_LIPO;
130 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
133 static int acpi_battery_get_property(struct power_supply *psy,
134 enum power_supply_property psp,
135 union power_supply_propval *val)
137 struct acpi_battery *battery = to_acpi_battery(psy);
139 if ((!acpi_battery_present(battery)) &&
140 psp != POWER_SUPPLY_PROP_PRESENT)
143 case POWER_SUPPLY_PROP_STATUS:
144 if (battery->state & 0x01)
145 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
146 else if (battery->state & 0x02)
147 val->intval = POWER_SUPPLY_STATUS_CHARGING;
148 else if (battery->state == 0)
149 val->intval = POWER_SUPPLY_STATUS_FULL;
151 case POWER_SUPPLY_PROP_PRESENT:
152 val->intval = acpi_battery_present(battery);
154 case POWER_SUPPLY_PROP_TECHNOLOGY:
155 val->intval = acpi_battery_technology(battery);
157 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
158 val->intval = battery->design_voltage * 1000;
160 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
161 val->intval = battery->voltage_now * 1000;
163 case POWER_SUPPLY_PROP_CURRENT_NOW:
164 val->intval = battery->current_now * 1000;
166 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
167 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
168 val->intval = battery->design_capacity * 1000;
170 case POWER_SUPPLY_PROP_CHARGE_FULL:
171 case POWER_SUPPLY_PROP_ENERGY_FULL:
172 val->intval = battery->full_charge_capacity * 1000;
174 case POWER_SUPPLY_PROP_CHARGE_NOW:
175 case POWER_SUPPLY_PROP_ENERGY_NOW:
176 val->intval = battery->capacity_now * 1000;
178 case POWER_SUPPLY_PROP_MODEL_NAME:
179 val->strval = battery->model_number;
181 case POWER_SUPPLY_PROP_MANUFACTURER:
182 val->strval = battery->oem_info;
190 static enum power_supply_property charge_battery_props[] = {
191 POWER_SUPPLY_PROP_STATUS,
192 POWER_SUPPLY_PROP_PRESENT,
193 POWER_SUPPLY_PROP_TECHNOLOGY,
194 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
195 POWER_SUPPLY_PROP_VOLTAGE_NOW,
196 POWER_SUPPLY_PROP_CURRENT_NOW,
197 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
198 POWER_SUPPLY_PROP_CHARGE_FULL,
199 POWER_SUPPLY_PROP_CHARGE_NOW,
200 POWER_SUPPLY_PROP_MODEL_NAME,
201 POWER_SUPPLY_PROP_MANUFACTURER,
204 static enum power_supply_property energy_battery_props[] = {
205 POWER_SUPPLY_PROP_STATUS,
206 POWER_SUPPLY_PROP_PRESENT,
207 POWER_SUPPLY_PROP_TECHNOLOGY,
208 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
209 POWER_SUPPLY_PROP_VOLTAGE_NOW,
210 POWER_SUPPLY_PROP_CURRENT_NOW,
211 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
212 POWER_SUPPLY_PROP_ENERGY_FULL,
213 POWER_SUPPLY_PROP_ENERGY_NOW,
214 POWER_SUPPLY_PROP_MODEL_NAME,
215 POWER_SUPPLY_PROP_MANUFACTURER,
218 #ifdef CONFIG_ACPI_PROCFS
219 inline char *acpi_battery_units(struct acpi_battery *battery)
221 return (battery->power_unit)?"mA":"mW";
225 /* --------------------------------------------------------------------------
227 -------------------------------------------------------------------------- */
228 struct acpi_offsets {
229 size_t offset; /* offset inside struct acpi_sbs_battery */
230 u8 mode; /* int or string? */
233 static struct acpi_offsets state_offsets[] = {
234 {offsetof(struct acpi_battery, state), 0},
235 {offsetof(struct acpi_battery, current_now), 0},
236 {offsetof(struct acpi_battery, capacity_now), 0},
237 {offsetof(struct acpi_battery, voltage_now), 0},
240 static struct acpi_offsets info_offsets[] = {
241 {offsetof(struct acpi_battery, power_unit), 0},
242 {offsetof(struct acpi_battery, design_capacity), 0},
243 {offsetof(struct acpi_battery, full_charge_capacity), 0},
244 {offsetof(struct acpi_battery, technology), 0},
245 {offsetof(struct acpi_battery, design_voltage), 0},
246 {offsetof(struct acpi_battery, design_capacity_warning), 0},
247 {offsetof(struct acpi_battery, design_capacity_low), 0},
248 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
249 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
250 {offsetof(struct acpi_battery, model_number), 1},
251 {offsetof(struct acpi_battery, serial_number), 1},
252 {offsetof(struct acpi_battery, type), 1},
253 {offsetof(struct acpi_battery, oem_info), 1},
256 static int extract_package(struct acpi_battery *battery,
257 union acpi_object *package,
258 struct acpi_offsets *offsets, int num)
261 union acpi_object *element;
262 if (package->type != ACPI_TYPE_PACKAGE)
264 for (i = 0; i < num; ++i) {
265 if (package->package.count <= i)
267 element = &package->package.elements[i];
268 if (offsets[i].mode) {
269 if (element->type != ACPI_TYPE_STRING &&
270 element->type != ACPI_TYPE_BUFFER)
272 strncpy((u8 *)battery + offsets[i].offset,
273 element->string.pointer, 32);
275 if (element->type != ACPI_TYPE_INTEGER)
277 x = (int *)((u8 *)battery + offsets[i].offset);
278 *x = element->integer.value;
284 static int acpi_battery_get_status(struct acpi_battery *battery)
286 if (acpi_bus_get_status(battery->device)) {
287 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
293 static int acpi_battery_get_info(struct acpi_battery *battery)
295 int result = -EFAULT;
296 acpi_status status = 0;
297 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
299 if (!acpi_battery_present(battery))
301 mutex_lock(&battery->lock);
302 status = acpi_evaluate_object(battery->device->handle, "_BIF",
304 mutex_unlock(&battery->lock);
306 if (ACPI_FAILURE(status)) {
307 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BIF"));
311 result = extract_package(battery, buffer.pointer,
312 info_offsets, ARRAY_SIZE(info_offsets));
313 kfree(buffer.pointer);
317 static int acpi_battery_get_state(struct acpi_battery *battery)
320 acpi_status status = 0;
321 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
323 if (!acpi_battery_present(battery))
326 if (battery->update_time &&
327 time_before(jiffies, battery->update_time +
328 msecs_to_jiffies(cache_time)))
331 mutex_lock(&battery->lock);
332 status = acpi_evaluate_object(battery->device->handle, "_BST",
334 mutex_unlock(&battery->lock);
336 if (ACPI_FAILURE(status)) {
337 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
341 result = extract_package(battery, buffer.pointer,
342 state_offsets, ARRAY_SIZE(state_offsets));
343 battery->update_time = jiffies;
344 kfree(buffer.pointer);
348 static int acpi_battery_set_alarm(struct acpi_battery *battery)
350 acpi_status status = 0;
351 union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
352 struct acpi_object_list arg_list = { 1, &arg0 };
354 if (!acpi_battery_present(battery)|| !battery->alarm_present)
357 arg0.integer.value = battery->alarm;
359 mutex_lock(&battery->lock);
360 status = acpi_evaluate_object(battery->device->handle, "_BTP",
362 mutex_unlock(&battery->lock);
364 if (ACPI_FAILURE(status))
367 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
371 static int acpi_battery_init_alarm(struct acpi_battery *battery)
373 acpi_status status = AE_OK;
374 acpi_handle handle = NULL;
376 /* See if alarms are supported, and if so, set default */
377 status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
378 if (ACPI_FAILURE(status)) {
379 battery->alarm_present = 0;
382 battery->alarm_present = 1;
384 battery->alarm = battery->design_capacity_warning;
385 return acpi_battery_set_alarm(battery);
388 static int acpi_battery_update(struct acpi_battery *battery)
390 int saved_present = acpi_battery_present(battery);
391 int result = acpi_battery_get_status(battery);
392 if (result || !acpi_battery_present(battery))
394 if (saved_present != acpi_battery_present(battery) ||
395 !battery->update_time) {
396 battery->update_time = 0;
397 result = acpi_battery_get_info(battery);
400 if (battery->power_unit) {
401 battery->bat.properties = charge_battery_props;
402 battery->bat.num_properties =
403 ARRAY_SIZE(charge_battery_props);
405 battery->bat.properties = energy_battery_props;
406 battery->bat.num_properties =
407 ARRAY_SIZE(energy_battery_props);
409 acpi_battery_init_alarm(battery);
411 return acpi_battery_get_state(battery);
414 /* --------------------------------------------------------------------------
416 -------------------------------------------------------------------------- */
418 #ifdef CONFIG_ACPI_PROCFS
419 static struct proc_dir_entry *acpi_battery_dir;
421 static int acpi_battery_print_info(struct seq_file *seq, int result)
423 struct acpi_battery *battery = seq->private;
428 seq_printf(seq, "present: %s\n",
429 acpi_battery_present(battery)?"yes":"no");
430 if (!acpi_battery_present(battery))
432 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
433 seq_printf(seq, "design capacity: unknown\n");
435 seq_printf(seq, "design capacity: %d %sh\n",
436 battery->design_capacity,
437 acpi_battery_units(battery));
439 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
440 seq_printf(seq, "last full capacity: unknown\n");
442 seq_printf(seq, "last full capacity: %d %sh\n",
443 battery->full_charge_capacity,
444 acpi_battery_units(battery));
446 seq_printf(seq, "battery technology: %srechargeable\n",
447 (!battery->technology)?"non-":"");
449 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
450 seq_printf(seq, "design voltage: unknown\n");
452 seq_printf(seq, "design voltage: %d mV\n",
453 battery->design_voltage);
454 seq_printf(seq, "design capacity warning: %d %sh\n",
455 battery->design_capacity_warning,
456 acpi_battery_units(battery));
457 seq_printf(seq, "design capacity low: %d %sh\n",
458 battery->design_capacity_low,
459 acpi_battery_units(battery));
460 seq_printf(seq, "capacity granularity 1: %d %sh\n",
461 battery->capacity_granularity_1,
462 acpi_battery_units(battery));
463 seq_printf(seq, "capacity granularity 2: %d %sh\n",
464 battery->capacity_granularity_2,
465 acpi_battery_units(battery));
466 seq_printf(seq, "model number: %s\n", battery->model_number);
467 seq_printf(seq, "serial number: %s\n", battery->serial_number);
468 seq_printf(seq, "battery type: %s\n", battery->type);
469 seq_printf(seq, "OEM info: %s\n", battery->oem_info);
472 seq_printf(seq, "ERROR: Unable to read battery info\n");
476 static int acpi_battery_print_state(struct seq_file *seq, int result)
478 struct acpi_battery *battery = seq->private;
483 seq_printf(seq, "present: %s\n",
484 acpi_battery_present(battery)?"yes":"no");
485 if (!acpi_battery_present(battery))
488 seq_printf(seq, "capacity state: %s\n",
489 (battery->state & 0x04)?"critical":"ok");
490 if ((battery->state & 0x01) && (battery->state & 0x02))
492 "charging state: charging/discharging\n");
493 else if (battery->state & 0x01)
494 seq_printf(seq, "charging state: discharging\n");
495 else if (battery->state & 0x02)
496 seq_printf(seq, "charging state: charging\n");
498 seq_printf(seq, "charging state: charged\n");
500 if (battery->current_now == ACPI_BATTERY_VALUE_UNKNOWN)
501 seq_printf(seq, "present rate: unknown\n");
503 seq_printf(seq, "present rate: %d %s\n",
504 battery->current_now, acpi_battery_units(battery));
506 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
507 seq_printf(seq, "remaining capacity: unknown\n");
509 seq_printf(seq, "remaining capacity: %d %sh\n",
510 battery->capacity_now, acpi_battery_units(battery));
511 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
512 seq_printf(seq, "present voltage: unknown\n");
514 seq_printf(seq, "present voltage: %d mV\n",
515 battery->voltage_now);
518 seq_printf(seq, "ERROR: Unable to read battery state\n");
523 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
525 struct acpi_battery *battery = seq->private;
530 if (!acpi_battery_present(battery)) {
531 seq_printf(seq, "present: no\n");
534 seq_printf(seq, "alarm: ");
536 seq_printf(seq, "unsupported\n");
538 seq_printf(seq, "%u %sh\n", battery->alarm,
539 acpi_battery_units(battery));
542 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
546 static ssize_t acpi_battery_write_alarm(struct file *file,
547 const char __user * buffer,
548 size_t count, loff_t * ppos)
551 char alarm_string[12] = { '\0' };
552 struct seq_file *m = file->private_data;
553 struct acpi_battery *battery = m->private;
555 if (!battery || (count > sizeof(alarm_string) - 1))
557 if (!acpi_battery_present(battery)) {
561 if (copy_from_user(alarm_string, buffer, count)) {
565 alarm_string[count] = '\0';
566 battery->alarm = simple_strtol(alarm_string, NULL, 0);
567 result = acpi_battery_set_alarm(battery);
574 typedef int(*print_func)(struct seq_file *seq, int result);
576 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
577 acpi_battery_print_info,
578 acpi_battery_print_state,
579 acpi_battery_print_alarm,
582 static int acpi_battery_read(int fid, struct seq_file *seq)
584 struct acpi_battery *battery = seq->private;
585 int result = acpi_battery_update(battery);
586 return acpi_print_funcs[fid](seq, result);
589 #define DECLARE_FILE_FUNCTIONS(_name) \
590 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
592 return acpi_battery_read(_name##_tag, seq); \
594 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
596 return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
599 DECLARE_FILE_FUNCTIONS(info);
600 DECLARE_FILE_FUNCTIONS(state);
601 DECLARE_FILE_FUNCTIONS(alarm);
603 #undef DECLARE_FILE_FUNCTIONS
605 #define FILE_DESCRIPTION_RO(_name) \
607 .name = __stringify(_name), \
610 .open = acpi_battery_##_name##_open_fs, \
612 .llseek = seq_lseek, \
613 .release = single_release, \
614 .owner = THIS_MODULE, \
618 #define FILE_DESCRIPTION_RW(_name) \
620 .name = __stringify(_name), \
621 .mode = S_IFREG | S_IRUGO | S_IWUSR, \
623 .open = acpi_battery_##_name##_open_fs, \
625 .llseek = seq_lseek, \
626 .write = acpi_battery_write_##_name, \
627 .release = single_release, \
628 .owner = THIS_MODULE, \
632 static struct battery_file {
633 struct file_operations ops;
636 } acpi_battery_file[] = {
637 FILE_DESCRIPTION_RO(info),
638 FILE_DESCRIPTION_RO(state),
639 FILE_DESCRIPTION_RW(alarm),
642 #undef FILE_DESCRIPTION_RO
643 #undef FILE_DESCRIPTION_RW
645 static int acpi_battery_add_fs(struct acpi_device *device)
647 struct proc_dir_entry *entry = NULL;
650 if (!acpi_device_dir(device)) {
651 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
653 if (!acpi_device_dir(device))
655 acpi_device_dir(device)->owner = THIS_MODULE;
658 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
659 entry = create_proc_entry(acpi_battery_file[i].name,
660 acpi_battery_file[i].mode, acpi_device_dir(device));
664 entry->proc_fops = &acpi_battery_file[i].ops;
665 entry->data = acpi_driver_data(device);
666 entry->owner = THIS_MODULE;
672 static void acpi_battery_remove_fs(struct acpi_device *device)
675 if (!acpi_device_dir(device))
677 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
678 remove_proc_entry(acpi_battery_file[i].name,
679 acpi_device_dir(device));
681 remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
682 acpi_device_dir(device) = NULL;
687 static ssize_t acpi_battery_alarm_show(struct device *dev,
688 struct device_attribute *attr,
691 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
692 return sprintf(buf, "%d\n", battery->alarm * 1000);
695 static ssize_t acpi_battery_alarm_store(struct device *dev,
696 struct device_attribute *attr,
697 const char *buf, size_t count)
700 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
701 if (sscanf(buf, "%ld\n", &x) == 1)
702 battery->alarm = x/1000;
703 if (acpi_battery_present(battery))
704 acpi_battery_set_alarm(battery);
708 static struct device_attribute alarm_attr = {
709 .attr = {.name = "alarm", .mode = 0644, .owner = THIS_MODULE},
710 .show = acpi_battery_alarm_show,
711 .store = acpi_battery_alarm_store,
714 /* --------------------------------------------------------------------------
716 -------------------------------------------------------------------------- */
718 static void acpi_battery_notify(acpi_handle handle, u32 event, void *data)
720 struct acpi_battery *battery = data;
721 struct acpi_device *device;
724 device = battery->device;
725 acpi_battery_update(battery);
726 acpi_bus_generate_proc_event(device, event,
727 acpi_battery_present(battery));
728 acpi_bus_generate_netlink_event(device->pnp.device_class,
729 device->dev.bus_id, event,
730 acpi_battery_present(battery));
731 kobject_uevent(&battery->bat.dev->kobj, KOBJ_CHANGE);
734 static int acpi_battery_add(struct acpi_device *device)
737 acpi_status status = 0;
738 struct acpi_battery *battery = NULL;
741 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
744 battery->device = device;
745 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
746 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
747 acpi_driver_data(device) = battery;
748 mutex_init(&battery->lock);
749 acpi_battery_update(battery);
750 #ifdef CONFIG_ACPI_PROCFS
751 result = acpi_battery_add_fs(device);
755 battery->bat.name = acpi_device_bid(device);
756 battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
757 battery->bat.get_property = acpi_battery_get_property;
758 result = power_supply_register(&battery->device->dev, &battery->bat);
759 result = device_create_file(battery->bat.dev, &alarm_attr);
760 status = acpi_install_notify_handler(device->handle,
762 acpi_battery_notify, battery);
763 if (ACPI_FAILURE(status)) {
764 ACPI_EXCEPTION((AE_INFO, status, "Installing notify handler"));
768 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
769 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
770 device->status.battery_present ? "present" : "absent");
773 #ifdef CONFIG_ACPI_PROCFS
774 acpi_battery_remove_fs(device);
781 static int acpi_battery_remove(struct acpi_device *device, int type)
783 acpi_status status = 0;
784 struct acpi_battery *battery = NULL;
786 if (!device || !acpi_driver_data(device))
788 battery = acpi_driver_data(device);
789 status = acpi_remove_notify_handler(device->handle,
791 acpi_battery_notify);
792 #ifdef CONFIG_ACPI_PROCFS
793 acpi_battery_remove_fs(device);
795 if (battery->bat.dev) {
796 device_remove_file(battery->bat.dev, &alarm_attr);
797 power_supply_unregister(&battery->bat);
799 mutex_destroy(&battery->lock);
804 /* this is needed to learn about changes made in suspended state */
805 static int acpi_battery_resume(struct acpi_device *device)
807 struct acpi_battery *battery;
810 battery = acpi_driver_data(device);
811 battery->update_time = 0;
815 static struct acpi_driver acpi_battery_driver = {
817 .class = ACPI_BATTERY_CLASS,
818 .ids = battery_device_ids,
820 .add = acpi_battery_add,
821 .resume = acpi_battery_resume,
822 .remove = acpi_battery_remove,
826 static int __init acpi_battery_init(void)
830 #ifdef CONFIG_ACPI_PROCFS
831 acpi_battery_dir = acpi_lock_battery_dir();
832 if (!acpi_battery_dir)
835 if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
836 #ifdef CONFIG_ACPI_PROCFS
837 acpi_unlock_battery_dir(acpi_battery_dir);
844 static void __exit acpi_battery_exit(void)
846 acpi_bus_unregister_driver(&acpi_battery_driver);
847 #ifdef CONFIG_ACPI_PROCFS
848 acpi_unlock_battery_dir(acpi_battery_dir);
852 module_init(acpi_battery_init);
853 module_exit(acpi_battery_exit);