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_update(struct acpi_battery *battery);
135 static int acpi_battery_get_property(struct power_supply *psy,
136 enum power_supply_property psp,
137 union power_supply_propval *val)
139 struct acpi_battery *battery = to_acpi_battery(psy);
141 if ((!acpi_battery_present(battery)) &&
142 psp != POWER_SUPPLY_PROP_PRESENT)
144 acpi_battery_update(battery);
146 case POWER_SUPPLY_PROP_STATUS:
147 if (battery->state & 0x01)
148 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
149 else if (battery->state & 0x02)
150 val->intval = POWER_SUPPLY_STATUS_CHARGING;
151 else if (battery->state == 0)
152 val->intval = POWER_SUPPLY_STATUS_FULL;
154 case POWER_SUPPLY_PROP_PRESENT:
155 val->intval = acpi_battery_present(battery);
157 case POWER_SUPPLY_PROP_TECHNOLOGY:
158 val->intval = acpi_battery_technology(battery);
160 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
161 val->intval = battery->design_voltage * 1000;
163 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
164 val->intval = battery->voltage_now * 1000;
166 case POWER_SUPPLY_PROP_CURRENT_NOW:
167 val->intval = battery->current_now * 1000;
169 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
170 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
171 val->intval = battery->design_capacity * 1000;
173 case POWER_SUPPLY_PROP_CHARGE_FULL:
174 case POWER_SUPPLY_PROP_ENERGY_FULL:
175 val->intval = battery->full_charge_capacity * 1000;
177 case POWER_SUPPLY_PROP_CHARGE_NOW:
178 case POWER_SUPPLY_PROP_ENERGY_NOW:
179 val->intval = battery->capacity_now * 1000;
181 case POWER_SUPPLY_PROP_MODEL_NAME:
182 val->strval = battery->model_number;
184 case POWER_SUPPLY_PROP_MANUFACTURER:
185 val->strval = battery->oem_info;
193 static enum power_supply_property charge_battery_props[] = {
194 POWER_SUPPLY_PROP_STATUS,
195 POWER_SUPPLY_PROP_PRESENT,
196 POWER_SUPPLY_PROP_TECHNOLOGY,
197 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
198 POWER_SUPPLY_PROP_VOLTAGE_NOW,
199 POWER_SUPPLY_PROP_CURRENT_NOW,
200 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
201 POWER_SUPPLY_PROP_CHARGE_FULL,
202 POWER_SUPPLY_PROP_CHARGE_NOW,
203 POWER_SUPPLY_PROP_MODEL_NAME,
204 POWER_SUPPLY_PROP_MANUFACTURER,
207 static enum power_supply_property energy_battery_props[] = {
208 POWER_SUPPLY_PROP_STATUS,
209 POWER_SUPPLY_PROP_PRESENT,
210 POWER_SUPPLY_PROP_TECHNOLOGY,
211 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
212 POWER_SUPPLY_PROP_VOLTAGE_NOW,
213 POWER_SUPPLY_PROP_CURRENT_NOW,
214 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
215 POWER_SUPPLY_PROP_ENERGY_FULL,
216 POWER_SUPPLY_PROP_ENERGY_NOW,
217 POWER_SUPPLY_PROP_MODEL_NAME,
218 POWER_SUPPLY_PROP_MANUFACTURER,
221 #ifdef CONFIG_ACPI_PROCFS
222 inline char *acpi_battery_units(struct acpi_battery *battery)
224 return (battery->power_unit)?"mA":"mW";
228 /* --------------------------------------------------------------------------
230 -------------------------------------------------------------------------- */
231 struct acpi_offsets {
232 size_t offset; /* offset inside struct acpi_sbs_battery */
233 u8 mode; /* int or string? */
236 static struct acpi_offsets state_offsets[] = {
237 {offsetof(struct acpi_battery, state), 0},
238 {offsetof(struct acpi_battery, current_now), 0},
239 {offsetof(struct acpi_battery, capacity_now), 0},
240 {offsetof(struct acpi_battery, voltage_now), 0},
243 static struct acpi_offsets info_offsets[] = {
244 {offsetof(struct acpi_battery, power_unit), 0},
245 {offsetof(struct acpi_battery, design_capacity), 0},
246 {offsetof(struct acpi_battery, full_charge_capacity), 0},
247 {offsetof(struct acpi_battery, technology), 0},
248 {offsetof(struct acpi_battery, design_voltage), 0},
249 {offsetof(struct acpi_battery, design_capacity_warning), 0},
250 {offsetof(struct acpi_battery, design_capacity_low), 0},
251 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
252 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
253 {offsetof(struct acpi_battery, model_number), 1},
254 {offsetof(struct acpi_battery, serial_number), 1},
255 {offsetof(struct acpi_battery, type), 1},
256 {offsetof(struct acpi_battery, oem_info), 1},
259 static int extract_package(struct acpi_battery *battery,
260 union acpi_object *package,
261 struct acpi_offsets *offsets, int num)
264 union acpi_object *element;
265 if (package->type != ACPI_TYPE_PACKAGE)
267 for (i = 0; i < num; ++i) {
268 if (package->package.count <= i)
270 element = &package->package.elements[i];
271 if (offsets[i].mode) {
272 if (element->type != ACPI_TYPE_STRING &&
273 element->type != ACPI_TYPE_BUFFER)
275 strncpy((u8 *)battery + offsets[i].offset,
276 element->string.pointer, 32);
278 if (element->type != ACPI_TYPE_INTEGER)
280 x = (int *)((u8 *)battery + offsets[i].offset);
281 *x = element->integer.value;
287 static int acpi_battery_get_status(struct acpi_battery *battery)
289 if (acpi_bus_get_status(battery->device)) {
290 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
296 static int acpi_battery_get_info(struct acpi_battery *battery)
298 int result = -EFAULT;
299 acpi_status status = 0;
300 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
302 if (!acpi_battery_present(battery))
304 mutex_lock(&battery->lock);
305 status = acpi_evaluate_object(battery->device->handle, "_BIF",
307 mutex_unlock(&battery->lock);
309 if (ACPI_FAILURE(status)) {
310 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BIF"));
314 result = extract_package(battery, buffer.pointer,
315 info_offsets, ARRAY_SIZE(info_offsets));
316 kfree(buffer.pointer);
320 static int acpi_battery_get_state(struct acpi_battery *battery)
323 acpi_status status = 0;
324 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
326 if (!acpi_battery_present(battery))
329 if (battery->update_time &&
330 time_before(jiffies, battery->update_time +
331 msecs_to_jiffies(cache_time)))
334 mutex_lock(&battery->lock);
335 status = acpi_evaluate_object(battery->device->handle, "_BST",
337 mutex_unlock(&battery->lock);
339 if (ACPI_FAILURE(status)) {
340 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
344 result = extract_package(battery, buffer.pointer,
345 state_offsets, ARRAY_SIZE(state_offsets));
346 battery->update_time = jiffies;
347 kfree(buffer.pointer);
351 static int acpi_battery_set_alarm(struct acpi_battery *battery)
353 acpi_status status = 0;
354 union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
355 struct acpi_object_list arg_list = { 1, &arg0 };
357 if (!acpi_battery_present(battery)|| !battery->alarm_present)
360 arg0.integer.value = battery->alarm;
362 mutex_lock(&battery->lock);
363 status = acpi_evaluate_object(battery->device->handle, "_BTP",
365 mutex_unlock(&battery->lock);
367 if (ACPI_FAILURE(status))
370 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
374 static int acpi_battery_init_alarm(struct acpi_battery *battery)
376 acpi_status status = AE_OK;
377 acpi_handle handle = NULL;
379 /* See if alarms are supported, and if so, set default */
380 status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
381 if (ACPI_FAILURE(status)) {
382 battery->alarm_present = 0;
385 battery->alarm_present = 1;
387 battery->alarm = battery->design_capacity_warning;
388 return acpi_battery_set_alarm(battery);
391 static ssize_t acpi_battery_alarm_show(struct device *dev,
392 struct device_attribute *attr,
395 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
396 return sprintf(buf, "%d\n", battery->alarm * 1000);
399 static ssize_t acpi_battery_alarm_store(struct device *dev,
400 struct device_attribute *attr,
401 const char *buf, size_t count)
404 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
405 if (sscanf(buf, "%ld\n", &x) == 1)
406 battery->alarm = x/1000;
407 if (acpi_battery_present(battery))
408 acpi_battery_set_alarm(battery);
412 static struct device_attribute alarm_attr = {
413 .attr = {.name = "alarm", .mode = 0644, .owner = THIS_MODULE},
414 .show = acpi_battery_alarm_show,
415 .store = acpi_battery_alarm_store,
418 static int sysfs_add_battery(struct acpi_battery *battery)
422 battery->update_time = 0;
423 result = acpi_battery_get_info(battery);
424 acpi_battery_init_alarm(battery);
427 if (battery->power_unit) {
428 battery->bat.properties = charge_battery_props;
429 battery->bat.num_properties =
430 ARRAY_SIZE(charge_battery_props);
432 battery->bat.properties = energy_battery_props;
433 battery->bat.num_properties =
434 ARRAY_SIZE(energy_battery_props);
437 battery->bat.name = acpi_device_bid(battery->device);
438 battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
439 battery->bat.get_property = acpi_battery_get_property;
441 result = power_supply_register(&battery->device->dev, &battery->bat);
444 return device_create_file(battery->bat.dev, &alarm_attr);
447 static void sysfs_remove_battery(struct acpi_battery *battery)
449 if (!battery->bat.dev)
451 device_remove_file(battery->bat.dev, &alarm_attr);
452 power_supply_unregister(&battery->bat);
455 static int acpi_battery_update(struct acpi_battery *battery)
457 int result = acpi_battery_get_status(battery);
460 if (!acpi_battery_present(battery)) {
461 sysfs_remove_battery(battery);
464 if (!battery->bat.dev)
465 sysfs_add_battery(battery);
466 return acpi_battery_get_state(battery);
469 /* --------------------------------------------------------------------------
471 -------------------------------------------------------------------------- */
473 #ifdef CONFIG_ACPI_PROCFS
474 static struct proc_dir_entry *acpi_battery_dir;
476 static int acpi_battery_print_info(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))
487 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
488 seq_printf(seq, "design capacity: unknown\n");
490 seq_printf(seq, "design capacity: %d %sh\n",
491 battery->design_capacity,
492 acpi_battery_units(battery));
494 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
495 seq_printf(seq, "last full capacity: unknown\n");
497 seq_printf(seq, "last full capacity: %d %sh\n",
498 battery->full_charge_capacity,
499 acpi_battery_units(battery));
501 seq_printf(seq, "battery technology: %srechargeable\n",
502 (!battery->technology)?"non-":"");
504 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
505 seq_printf(seq, "design voltage: unknown\n");
507 seq_printf(seq, "design voltage: %d mV\n",
508 battery->design_voltage);
509 seq_printf(seq, "design capacity warning: %d %sh\n",
510 battery->design_capacity_warning,
511 acpi_battery_units(battery));
512 seq_printf(seq, "design capacity low: %d %sh\n",
513 battery->design_capacity_low,
514 acpi_battery_units(battery));
515 seq_printf(seq, "capacity granularity 1: %d %sh\n",
516 battery->capacity_granularity_1,
517 acpi_battery_units(battery));
518 seq_printf(seq, "capacity granularity 2: %d %sh\n",
519 battery->capacity_granularity_2,
520 acpi_battery_units(battery));
521 seq_printf(seq, "model number: %s\n", battery->model_number);
522 seq_printf(seq, "serial number: %s\n", battery->serial_number);
523 seq_printf(seq, "battery type: %s\n", battery->type);
524 seq_printf(seq, "OEM info: %s\n", battery->oem_info);
527 seq_printf(seq, "ERROR: Unable to read battery info\n");
531 static int acpi_battery_print_state(struct seq_file *seq, int result)
533 struct acpi_battery *battery = seq->private;
538 seq_printf(seq, "present: %s\n",
539 acpi_battery_present(battery)?"yes":"no");
540 if (!acpi_battery_present(battery))
543 seq_printf(seq, "capacity state: %s\n",
544 (battery->state & 0x04)?"critical":"ok");
545 if ((battery->state & 0x01) && (battery->state & 0x02))
547 "charging state: charging/discharging\n");
548 else if (battery->state & 0x01)
549 seq_printf(seq, "charging state: discharging\n");
550 else if (battery->state & 0x02)
551 seq_printf(seq, "charging state: charging\n");
553 seq_printf(seq, "charging state: charged\n");
555 if (battery->current_now == ACPI_BATTERY_VALUE_UNKNOWN)
556 seq_printf(seq, "present rate: unknown\n");
558 seq_printf(seq, "present rate: %d %s\n",
559 battery->current_now, acpi_battery_units(battery));
561 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
562 seq_printf(seq, "remaining capacity: unknown\n");
564 seq_printf(seq, "remaining capacity: %d %sh\n",
565 battery->capacity_now, acpi_battery_units(battery));
566 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
567 seq_printf(seq, "present voltage: unknown\n");
569 seq_printf(seq, "present voltage: %d mV\n",
570 battery->voltage_now);
573 seq_printf(seq, "ERROR: Unable to read battery state\n");
578 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
580 struct acpi_battery *battery = seq->private;
585 if (!acpi_battery_present(battery)) {
586 seq_printf(seq, "present: no\n");
589 seq_printf(seq, "alarm: ");
591 seq_printf(seq, "unsupported\n");
593 seq_printf(seq, "%u %sh\n", battery->alarm,
594 acpi_battery_units(battery));
597 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
601 static ssize_t acpi_battery_write_alarm(struct file *file,
602 const char __user * buffer,
603 size_t count, loff_t * ppos)
606 char alarm_string[12] = { '\0' };
607 struct seq_file *m = file->private_data;
608 struct acpi_battery *battery = m->private;
610 if (!battery || (count > sizeof(alarm_string) - 1))
612 if (!acpi_battery_present(battery)) {
616 if (copy_from_user(alarm_string, buffer, count)) {
620 alarm_string[count] = '\0';
621 battery->alarm = simple_strtol(alarm_string, NULL, 0);
622 result = acpi_battery_set_alarm(battery);
629 typedef int(*print_func)(struct seq_file *seq, int result);
631 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
632 acpi_battery_print_info,
633 acpi_battery_print_state,
634 acpi_battery_print_alarm,
637 static int acpi_battery_read(int fid, struct seq_file *seq)
639 struct acpi_battery *battery = seq->private;
640 int result = acpi_battery_update(battery);
641 return acpi_print_funcs[fid](seq, result);
644 #define DECLARE_FILE_FUNCTIONS(_name) \
645 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
647 return acpi_battery_read(_name##_tag, seq); \
649 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
651 return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
654 DECLARE_FILE_FUNCTIONS(info);
655 DECLARE_FILE_FUNCTIONS(state);
656 DECLARE_FILE_FUNCTIONS(alarm);
658 #undef DECLARE_FILE_FUNCTIONS
660 #define FILE_DESCRIPTION_RO(_name) \
662 .name = __stringify(_name), \
665 .open = acpi_battery_##_name##_open_fs, \
667 .llseek = seq_lseek, \
668 .release = single_release, \
669 .owner = THIS_MODULE, \
673 #define FILE_DESCRIPTION_RW(_name) \
675 .name = __stringify(_name), \
676 .mode = S_IFREG | S_IRUGO | S_IWUSR, \
678 .open = acpi_battery_##_name##_open_fs, \
680 .llseek = seq_lseek, \
681 .write = acpi_battery_write_##_name, \
682 .release = single_release, \
683 .owner = THIS_MODULE, \
687 static struct battery_file {
688 struct file_operations ops;
691 } acpi_battery_file[] = {
692 FILE_DESCRIPTION_RO(info),
693 FILE_DESCRIPTION_RO(state),
694 FILE_DESCRIPTION_RW(alarm),
697 #undef FILE_DESCRIPTION_RO
698 #undef FILE_DESCRIPTION_RW
700 static int acpi_battery_add_fs(struct acpi_device *device)
702 struct proc_dir_entry *entry = NULL;
705 if (!acpi_device_dir(device)) {
706 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
708 if (!acpi_device_dir(device))
710 acpi_device_dir(device)->owner = THIS_MODULE;
713 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
714 entry = create_proc_entry(acpi_battery_file[i].name,
715 acpi_battery_file[i].mode, acpi_device_dir(device));
719 entry->proc_fops = &acpi_battery_file[i].ops;
720 entry->data = acpi_driver_data(device);
721 entry->owner = THIS_MODULE;
727 static void acpi_battery_remove_fs(struct acpi_device *device)
730 if (!acpi_device_dir(device))
732 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
733 remove_proc_entry(acpi_battery_file[i].name,
734 acpi_device_dir(device));
736 remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
737 acpi_device_dir(device) = NULL;
742 /* --------------------------------------------------------------------------
744 -------------------------------------------------------------------------- */
746 static void acpi_battery_notify(acpi_handle handle, u32 event, void *data)
748 struct acpi_battery *battery = data;
749 struct acpi_device *device;
752 device = battery->device;
753 acpi_battery_update(battery);
754 acpi_bus_generate_proc_event(device, event,
755 acpi_battery_present(battery));
756 acpi_bus_generate_netlink_event(device->pnp.device_class,
757 device->dev.bus_id, event,
758 acpi_battery_present(battery));
759 /* acpi_batter_update could remove power_supply object */
760 if (battery->bat.dev)
761 kobject_uevent(&battery->bat.dev->kobj, KOBJ_CHANGE);
764 static int acpi_battery_add(struct acpi_device *device)
767 acpi_status status = 0;
768 struct acpi_battery *battery = NULL;
771 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
774 battery->device = device;
775 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
776 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
777 acpi_driver_data(device) = battery;
778 mutex_init(&battery->lock);
779 acpi_battery_update(battery);
780 #ifdef CONFIG_ACPI_PROCFS
781 result = acpi_battery_add_fs(device);
785 status = acpi_install_notify_handler(device->handle,
787 acpi_battery_notify, battery);
788 if (ACPI_FAILURE(status)) {
789 ACPI_EXCEPTION((AE_INFO, status, "Installing notify handler"));
793 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
794 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
795 device->status.battery_present ? "present" : "absent");
798 #ifdef CONFIG_ACPI_PROCFS
799 acpi_battery_remove_fs(device);
806 static int acpi_battery_remove(struct acpi_device *device, int type)
808 acpi_status status = 0;
809 struct acpi_battery *battery = NULL;
811 if (!device || !acpi_driver_data(device))
813 battery = acpi_driver_data(device);
814 status = acpi_remove_notify_handler(device->handle,
816 acpi_battery_notify);
817 #ifdef CONFIG_ACPI_PROCFS
818 acpi_battery_remove_fs(device);
820 sysfs_remove_battery(battery);
821 mutex_destroy(&battery->lock);
826 /* this is needed to learn about changes made in suspended state */
827 static int acpi_battery_resume(struct acpi_device *device)
829 struct acpi_battery *battery;
832 battery = acpi_driver_data(device);
833 battery->update_time = 0;
834 acpi_battery_update(battery);
838 static struct acpi_driver acpi_battery_driver = {
840 .class = ACPI_BATTERY_CLASS,
841 .ids = battery_device_ids,
843 .add = acpi_battery_add,
844 .resume = acpi_battery_resume,
845 .remove = acpi_battery_remove,
849 static int __init acpi_battery_init(void)
853 #ifdef CONFIG_ACPI_PROCFS
854 acpi_battery_dir = acpi_lock_battery_dir();
855 if (!acpi_battery_dir)
858 if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
859 #ifdef CONFIG_ACPI_PROCFS
860 acpi_unlock_battery_dir(acpi_battery_dir);
867 static void __exit acpi_battery_exit(void)
869 acpi_bus_unregister_driver(&acpi_battery_driver);
870 #ifdef CONFIG_ACPI_PROCFS
871 acpi_unlock_battery_dir(acpi_battery_dir);
875 module_init(acpi_battery_init);
876 module_exit(acpi_battery_exit);