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_POWER
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 #ifdef CONFIG_ACPI_SYSFS_POWER
44 #include <linux/power_supply.h>
47 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
49 #define ACPI_BATTERY_CLASS "battery"
50 #define ACPI_BATTERY_DEVICE_NAME "Battery"
51 #define ACPI_BATTERY_NOTIFY_STATUS 0x80
52 #define ACPI_BATTERY_NOTIFY_INFO 0x81
54 #define _COMPONENT ACPI_BATTERY_COMPONENT
56 ACPI_MODULE_NAME("battery");
58 MODULE_AUTHOR("Paul Diefenbaugh");
59 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
60 MODULE_DESCRIPTION("ACPI Battery Driver");
61 MODULE_LICENSE("GPL");
63 static unsigned int cache_time = 1000;
64 module_param(cache_time, uint, 0644);
65 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
67 #ifdef CONFIG_ACPI_PROCFS_POWER
68 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
69 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
71 enum acpi_battery_files {
75 ACPI_BATTERY_NUMFILES,
80 static const struct acpi_device_id battery_device_ids[] = {
85 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
90 #ifdef CONFIG_ACPI_SYSFS_POWER
91 struct power_supply bat;
93 struct acpi_device *device;
94 unsigned long update_time;
99 int full_charge_capacity;
102 int design_capacity_warning;
103 int design_capacity_low;
104 int capacity_granularity_1;
105 int capacity_granularity_2;
107 char model_number[32];
108 char serial_number[32];
116 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
118 inline int acpi_battery_present(struct acpi_battery *battery)
120 return battery->device->status.battery_present;
123 #ifdef CONFIG_ACPI_SYSFS_POWER
124 static int acpi_battery_technology(struct acpi_battery *battery)
126 if (!strcasecmp("NiCd", battery->type))
127 return POWER_SUPPLY_TECHNOLOGY_NiCd;
128 if (!strcasecmp("NiMH", battery->type))
129 return POWER_SUPPLY_TECHNOLOGY_NiMH;
130 if (!strcasecmp("LION", battery->type))
131 return POWER_SUPPLY_TECHNOLOGY_LION;
132 if (!strncasecmp("LI-ION", battery->type, 6))
133 return POWER_SUPPLY_TECHNOLOGY_LION;
134 if (!strcasecmp("LiP", battery->type))
135 return POWER_SUPPLY_TECHNOLOGY_LIPO;
136 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
139 static int acpi_battery_get_state(struct acpi_battery *battery);
141 static int acpi_battery_is_charged(struct acpi_battery *battery)
143 /* either charging or discharging */
144 if (battery->state != 0)
147 /* battery not reporting charge */
148 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
149 battery->capacity_now == 0)
152 /* good batteries update full_charge as the batteries degrade */
153 if (battery->full_charge_capacity == battery->capacity_now)
156 /* fallback to using design values for broken batteries */
157 if (battery->design_capacity == battery->capacity_now)
160 /* we don't do any sort of metric based on percentages */
164 static int acpi_battery_get_property(struct power_supply *psy,
165 enum power_supply_property psp,
166 union power_supply_propval *val)
168 struct acpi_battery *battery = to_acpi_battery(psy);
170 if (acpi_battery_present(battery)) {
171 /* run battery update only if it is present */
172 acpi_battery_get_state(battery);
173 } else if (psp != POWER_SUPPLY_PROP_PRESENT)
176 case POWER_SUPPLY_PROP_STATUS:
177 if (battery->state & 0x01)
178 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
179 else if (battery->state & 0x02)
180 val->intval = POWER_SUPPLY_STATUS_CHARGING;
181 else if (acpi_battery_is_charged(battery))
182 val->intval = POWER_SUPPLY_STATUS_FULL;
184 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
186 case POWER_SUPPLY_PROP_PRESENT:
187 val->intval = acpi_battery_present(battery);
189 case POWER_SUPPLY_PROP_TECHNOLOGY:
190 val->intval = acpi_battery_technology(battery);
192 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
193 val->intval = battery->design_voltage * 1000;
195 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
196 val->intval = battery->voltage_now * 1000;
198 case POWER_SUPPLY_PROP_CURRENT_NOW:
199 case POWER_SUPPLY_PROP_POWER_NOW:
200 val->intval = battery->rate_now * 1000;
202 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
203 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
204 val->intval = battery->design_capacity * 1000;
206 case POWER_SUPPLY_PROP_CHARGE_FULL:
207 case POWER_SUPPLY_PROP_ENERGY_FULL:
208 val->intval = battery->full_charge_capacity * 1000;
210 case POWER_SUPPLY_PROP_CHARGE_NOW:
211 case POWER_SUPPLY_PROP_ENERGY_NOW:
212 val->intval = battery->capacity_now * 1000;
214 case POWER_SUPPLY_PROP_MODEL_NAME:
215 val->strval = battery->model_number;
217 case POWER_SUPPLY_PROP_MANUFACTURER:
218 val->strval = battery->oem_info;
220 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
221 val->strval = battery->serial_number;
229 static enum power_supply_property charge_battery_props[] = {
230 POWER_SUPPLY_PROP_STATUS,
231 POWER_SUPPLY_PROP_PRESENT,
232 POWER_SUPPLY_PROP_TECHNOLOGY,
233 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
234 POWER_SUPPLY_PROP_VOLTAGE_NOW,
235 POWER_SUPPLY_PROP_CURRENT_NOW,
236 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
237 POWER_SUPPLY_PROP_CHARGE_FULL,
238 POWER_SUPPLY_PROP_CHARGE_NOW,
239 POWER_SUPPLY_PROP_MODEL_NAME,
240 POWER_SUPPLY_PROP_MANUFACTURER,
241 POWER_SUPPLY_PROP_SERIAL_NUMBER,
244 static enum power_supply_property energy_battery_props[] = {
245 POWER_SUPPLY_PROP_STATUS,
246 POWER_SUPPLY_PROP_PRESENT,
247 POWER_SUPPLY_PROP_TECHNOLOGY,
248 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
249 POWER_SUPPLY_PROP_VOLTAGE_NOW,
250 POWER_SUPPLY_PROP_CURRENT_NOW,
251 POWER_SUPPLY_PROP_POWER_NOW,
252 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
253 POWER_SUPPLY_PROP_ENERGY_FULL,
254 POWER_SUPPLY_PROP_ENERGY_NOW,
255 POWER_SUPPLY_PROP_MODEL_NAME,
256 POWER_SUPPLY_PROP_MANUFACTURER,
257 POWER_SUPPLY_PROP_SERIAL_NUMBER,
261 #ifdef CONFIG_ACPI_PROCFS_POWER
262 inline char *acpi_battery_units(struct acpi_battery *battery)
264 return (battery->power_unit)?"mA":"mW";
268 /* --------------------------------------------------------------------------
270 -------------------------------------------------------------------------- */
271 struct acpi_offsets {
272 size_t offset; /* offset inside struct acpi_sbs_battery */
273 u8 mode; /* int or string? */
276 static struct acpi_offsets state_offsets[] = {
277 {offsetof(struct acpi_battery, state), 0},
278 {offsetof(struct acpi_battery, rate_now), 0},
279 {offsetof(struct acpi_battery, capacity_now), 0},
280 {offsetof(struct acpi_battery, voltage_now), 0},
283 static struct acpi_offsets info_offsets[] = {
284 {offsetof(struct acpi_battery, power_unit), 0},
285 {offsetof(struct acpi_battery, design_capacity), 0},
286 {offsetof(struct acpi_battery, full_charge_capacity), 0},
287 {offsetof(struct acpi_battery, technology), 0},
288 {offsetof(struct acpi_battery, design_voltage), 0},
289 {offsetof(struct acpi_battery, design_capacity_warning), 0},
290 {offsetof(struct acpi_battery, design_capacity_low), 0},
291 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
292 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
293 {offsetof(struct acpi_battery, model_number), 1},
294 {offsetof(struct acpi_battery, serial_number), 1},
295 {offsetof(struct acpi_battery, type), 1},
296 {offsetof(struct acpi_battery, oem_info), 1},
299 static int extract_package(struct acpi_battery *battery,
300 union acpi_object *package,
301 struct acpi_offsets *offsets, int num)
304 union acpi_object *element;
305 if (package->type != ACPI_TYPE_PACKAGE)
307 for (i = 0; i < num; ++i) {
308 if (package->package.count <= i)
310 element = &package->package.elements[i];
311 if (offsets[i].mode) {
312 u8 *ptr = (u8 *)battery + offsets[i].offset;
313 if (element->type == ACPI_TYPE_STRING ||
314 element->type == ACPI_TYPE_BUFFER)
315 strncpy(ptr, element->string.pointer, 32);
316 else if (element->type == ACPI_TYPE_INTEGER) {
317 strncpy(ptr, (u8 *)&element->integer.value,
318 sizeof(acpi_integer));
319 ptr[sizeof(acpi_integer)] = 0;
321 *ptr = 0; /* don't have value */
323 int *x = (int *)((u8 *)battery + offsets[i].offset);
324 *x = (element->type == ACPI_TYPE_INTEGER) ?
325 element->integer.value : -1;
331 static int acpi_battery_get_status(struct acpi_battery *battery)
333 if (acpi_bus_get_status(battery->device)) {
334 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
340 static int acpi_battery_get_info(struct acpi_battery *battery)
342 int result = -EFAULT;
343 acpi_status status = 0;
344 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
346 if (!acpi_battery_present(battery))
348 mutex_lock(&battery->lock);
349 status = acpi_evaluate_object(battery->device->handle, "_BIF",
351 mutex_unlock(&battery->lock);
353 if (ACPI_FAILURE(status)) {
354 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BIF"));
358 result = extract_package(battery, buffer.pointer,
359 info_offsets, ARRAY_SIZE(info_offsets));
360 kfree(buffer.pointer);
364 static int acpi_battery_get_state(struct acpi_battery *battery)
367 acpi_status status = 0;
368 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
370 if (!acpi_battery_present(battery))
373 if (battery->update_time &&
374 time_before(jiffies, battery->update_time +
375 msecs_to_jiffies(cache_time)))
378 mutex_lock(&battery->lock);
379 status = acpi_evaluate_object(battery->device->handle, "_BST",
381 mutex_unlock(&battery->lock);
383 if (ACPI_FAILURE(status)) {
384 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
388 result = extract_package(battery, buffer.pointer,
389 state_offsets, ARRAY_SIZE(state_offsets));
390 battery->update_time = jiffies;
391 kfree(buffer.pointer);
395 static int acpi_battery_set_alarm(struct acpi_battery *battery)
397 acpi_status status = 0;
398 union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
399 struct acpi_object_list arg_list = { 1, &arg0 };
401 if (!acpi_battery_present(battery)|| !battery->alarm_present)
404 arg0.integer.value = battery->alarm;
406 mutex_lock(&battery->lock);
407 status = acpi_evaluate_object(battery->device->handle, "_BTP",
409 mutex_unlock(&battery->lock);
411 if (ACPI_FAILURE(status))
414 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
418 static int acpi_battery_init_alarm(struct acpi_battery *battery)
420 acpi_status status = AE_OK;
421 acpi_handle handle = NULL;
423 /* See if alarms are supported, and if so, set default */
424 status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
425 if (ACPI_FAILURE(status)) {
426 battery->alarm_present = 0;
429 battery->alarm_present = 1;
431 battery->alarm = battery->design_capacity_warning;
432 return acpi_battery_set_alarm(battery);
435 #ifdef CONFIG_ACPI_SYSFS_POWER
436 static ssize_t acpi_battery_alarm_show(struct device *dev,
437 struct device_attribute *attr,
440 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
441 return sprintf(buf, "%d\n", battery->alarm * 1000);
444 static ssize_t acpi_battery_alarm_store(struct device *dev,
445 struct device_attribute *attr,
446 const char *buf, size_t count)
449 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
450 if (sscanf(buf, "%ld\n", &x) == 1)
451 battery->alarm = x/1000;
452 if (acpi_battery_present(battery))
453 acpi_battery_set_alarm(battery);
457 static struct device_attribute alarm_attr = {
458 .attr = {.name = "alarm", .mode = 0644},
459 .show = acpi_battery_alarm_show,
460 .store = acpi_battery_alarm_store,
463 static int sysfs_add_battery(struct acpi_battery *battery)
467 if (battery->power_unit) {
468 battery->bat.properties = charge_battery_props;
469 battery->bat.num_properties =
470 ARRAY_SIZE(charge_battery_props);
472 battery->bat.properties = energy_battery_props;
473 battery->bat.num_properties =
474 ARRAY_SIZE(energy_battery_props);
477 battery->bat.name = acpi_device_bid(battery->device);
478 battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
479 battery->bat.get_property = acpi_battery_get_property;
481 result = power_supply_register(&battery->device->dev, &battery->bat);
484 return device_create_file(battery->bat.dev, &alarm_attr);
487 static void sysfs_remove_battery(struct acpi_battery *battery)
489 if (!battery->bat.dev)
491 device_remove_file(battery->bat.dev, &alarm_attr);
492 power_supply_unregister(&battery->bat);
493 battery->bat.dev = NULL;
497 static int acpi_battery_update(struct acpi_battery *battery)
499 int result, old_present = acpi_battery_present(battery);
500 result = acpi_battery_get_status(battery);
503 #ifdef CONFIG_ACPI_SYSFS_POWER
504 if (!acpi_battery_present(battery)) {
505 sysfs_remove_battery(battery);
506 battery->update_time = 0;
510 if (!battery->update_time ||
511 old_present != acpi_battery_present(battery)) {
512 result = acpi_battery_get_info(battery);
515 acpi_battery_init_alarm(battery);
517 #ifdef CONFIG_ACPI_SYSFS_POWER
518 if (!battery->bat.dev)
519 sysfs_add_battery(battery);
521 return acpi_battery_get_state(battery);
524 /* --------------------------------------------------------------------------
526 -------------------------------------------------------------------------- */
528 #ifdef CONFIG_ACPI_PROCFS_POWER
529 static struct proc_dir_entry *acpi_battery_dir;
531 static int acpi_battery_print_info(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))
542 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
543 seq_printf(seq, "design capacity: unknown\n");
545 seq_printf(seq, "design capacity: %d %sh\n",
546 battery->design_capacity,
547 acpi_battery_units(battery));
549 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
550 seq_printf(seq, "last full capacity: unknown\n");
552 seq_printf(seq, "last full capacity: %d %sh\n",
553 battery->full_charge_capacity,
554 acpi_battery_units(battery));
556 seq_printf(seq, "battery technology: %srechargeable\n",
557 (!battery->technology)?"non-":"");
559 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
560 seq_printf(seq, "design voltage: unknown\n");
562 seq_printf(seq, "design voltage: %d mV\n",
563 battery->design_voltage);
564 seq_printf(seq, "design capacity warning: %d %sh\n",
565 battery->design_capacity_warning,
566 acpi_battery_units(battery));
567 seq_printf(seq, "design capacity low: %d %sh\n",
568 battery->design_capacity_low,
569 acpi_battery_units(battery));
570 seq_printf(seq, "capacity granularity 1: %d %sh\n",
571 battery->capacity_granularity_1,
572 acpi_battery_units(battery));
573 seq_printf(seq, "capacity granularity 2: %d %sh\n",
574 battery->capacity_granularity_2,
575 acpi_battery_units(battery));
576 seq_printf(seq, "model number: %s\n", battery->model_number);
577 seq_printf(seq, "serial number: %s\n", battery->serial_number);
578 seq_printf(seq, "battery type: %s\n", battery->type);
579 seq_printf(seq, "OEM info: %s\n", battery->oem_info);
582 seq_printf(seq, "ERROR: Unable to read battery info\n");
586 static int acpi_battery_print_state(struct seq_file *seq, int result)
588 struct acpi_battery *battery = seq->private;
593 seq_printf(seq, "present: %s\n",
594 acpi_battery_present(battery)?"yes":"no");
595 if (!acpi_battery_present(battery))
598 seq_printf(seq, "capacity state: %s\n",
599 (battery->state & 0x04)?"critical":"ok");
600 if ((battery->state & 0x01) && (battery->state & 0x02))
602 "charging state: charging/discharging\n");
603 else if (battery->state & 0x01)
604 seq_printf(seq, "charging state: discharging\n");
605 else if (battery->state & 0x02)
606 seq_printf(seq, "charging state: charging\n");
608 seq_printf(seq, "charging state: charged\n");
610 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
611 seq_printf(seq, "present rate: unknown\n");
613 seq_printf(seq, "present rate: %d %s\n",
614 battery->rate_now, acpi_battery_units(battery));
616 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
617 seq_printf(seq, "remaining capacity: unknown\n");
619 seq_printf(seq, "remaining capacity: %d %sh\n",
620 battery->capacity_now, acpi_battery_units(battery));
621 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
622 seq_printf(seq, "present voltage: unknown\n");
624 seq_printf(seq, "present voltage: %d mV\n",
625 battery->voltage_now);
628 seq_printf(seq, "ERROR: Unable to read battery state\n");
633 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
635 struct acpi_battery *battery = seq->private;
640 if (!acpi_battery_present(battery)) {
641 seq_printf(seq, "present: no\n");
644 seq_printf(seq, "alarm: ");
646 seq_printf(seq, "unsupported\n");
648 seq_printf(seq, "%u %sh\n", battery->alarm,
649 acpi_battery_units(battery));
652 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
656 static ssize_t acpi_battery_write_alarm(struct file *file,
657 const char __user * buffer,
658 size_t count, loff_t * ppos)
661 char alarm_string[12] = { '\0' };
662 struct seq_file *m = file->private_data;
663 struct acpi_battery *battery = m->private;
665 if (!battery || (count > sizeof(alarm_string) - 1))
667 if (!acpi_battery_present(battery)) {
671 if (copy_from_user(alarm_string, buffer, count)) {
675 alarm_string[count] = '\0';
676 battery->alarm = simple_strtol(alarm_string, NULL, 0);
677 result = acpi_battery_set_alarm(battery);
684 typedef int(*print_func)(struct seq_file *seq, int result);
686 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
687 acpi_battery_print_info,
688 acpi_battery_print_state,
689 acpi_battery_print_alarm,
692 static int acpi_battery_read(int fid, struct seq_file *seq)
694 struct acpi_battery *battery = seq->private;
695 int result = acpi_battery_update(battery);
696 return acpi_print_funcs[fid](seq, result);
699 #define DECLARE_FILE_FUNCTIONS(_name) \
700 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
702 return acpi_battery_read(_name##_tag, seq); \
704 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
706 return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
709 DECLARE_FILE_FUNCTIONS(info);
710 DECLARE_FILE_FUNCTIONS(state);
711 DECLARE_FILE_FUNCTIONS(alarm);
713 #undef DECLARE_FILE_FUNCTIONS
715 #define FILE_DESCRIPTION_RO(_name) \
717 .name = __stringify(_name), \
720 .open = acpi_battery_##_name##_open_fs, \
722 .llseek = seq_lseek, \
723 .release = single_release, \
724 .owner = THIS_MODULE, \
728 #define FILE_DESCRIPTION_RW(_name) \
730 .name = __stringify(_name), \
731 .mode = S_IFREG | S_IRUGO | S_IWUSR, \
733 .open = acpi_battery_##_name##_open_fs, \
735 .llseek = seq_lseek, \
736 .write = acpi_battery_write_##_name, \
737 .release = single_release, \
738 .owner = THIS_MODULE, \
742 static struct battery_file {
743 struct file_operations ops;
746 } acpi_battery_file[] = {
747 FILE_DESCRIPTION_RO(info),
748 FILE_DESCRIPTION_RO(state),
749 FILE_DESCRIPTION_RW(alarm),
752 #undef FILE_DESCRIPTION_RO
753 #undef FILE_DESCRIPTION_RW
755 static int acpi_battery_add_fs(struct acpi_device *device)
757 struct proc_dir_entry *entry = NULL;
760 if (!acpi_device_dir(device)) {
761 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
763 if (!acpi_device_dir(device))
765 acpi_device_dir(device)->owner = THIS_MODULE;
768 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
769 entry = proc_create_data(acpi_battery_file[i].name,
770 acpi_battery_file[i].mode,
771 acpi_device_dir(device),
772 &acpi_battery_file[i].ops,
773 acpi_driver_data(device));
780 static void acpi_battery_remove_fs(struct acpi_device *device)
783 if (!acpi_device_dir(device))
785 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
786 remove_proc_entry(acpi_battery_file[i].name,
787 acpi_device_dir(device));
789 remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
790 acpi_device_dir(device) = NULL;
795 /* --------------------------------------------------------------------------
797 -------------------------------------------------------------------------- */
799 static void acpi_battery_notify(acpi_handle handle, u32 event, void *data)
801 struct acpi_battery *battery = data;
802 struct acpi_device *device;
805 device = battery->device;
806 acpi_battery_update(battery);
807 acpi_bus_generate_proc_event(device, event,
808 acpi_battery_present(battery));
809 acpi_bus_generate_netlink_event(device->pnp.device_class,
810 dev_name(&device->dev), event,
811 acpi_battery_present(battery));
812 #ifdef CONFIG_ACPI_SYSFS_POWER
813 /* acpi_batter_update could remove power_supply object */
814 if (battery->bat.dev)
815 kobject_uevent(&battery->bat.dev->kobj, KOBJ_CHANGE);
819 static int acpi_battery_add(struct acpi_device *device)
822 acpi_status status = 0;
823 struct acpi_battery *battery = NULL;
826 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
829 battery->device = device;
830 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
831 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
832 device->driver_data = battery;
833 mutex_init(&battery->lock);
834 acpi_battery_update(battery);
835 #ifdef CONFIG_ACPI_PROCFS_POWER
836 result = acpi_battery_add_fs(device);
840 status = acpi_install_notify_handler(device->handle,
842 acpi_battery_notify, battery);
843 if (ACPI_FAILURE(status)) {
844 ACPI_EXCEPTION((AE_INFO, status, "Installing notify handler"));
848 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
849 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
850 device->status.battery_present ? "present" : "absent");
853 #ifdef CONFIG_ACPI_PROCFS_POWER
854 acpi_battery_remove_fs(device);
861 static int acpi_battery_remove(struct acpi_device *device, int type)
863 acpi_status status = 0;
864 struct acpi_battery *battery = NULL;
866 if (!device || !acpi_driver_data(device))
868 battery = acpi_driver_data(device);
869 status = acpi_remove_notify_handler(device->handle,
871 acpi_battery_notify);
872 #ifdef CONFIG_ACPI_PROCFS_POWER
873 acpi_battery_remove_fs(device);
875 #ifdef CONFIG_ACPI_SYSFS_POWER
876 sysfs_remove_battery(battery);
878 mutex_destroy(&battery->lock);
883 /* this is needed to learn about changes made in suspended state */
884 static int acpi_battery_resume(struct acpi_device *device)
886 struct acpi_battery *battery;
889 battery = acpi_driver_data(device);
890 battery->update_time = 0;
891 acpi_battery_update(battery);
895 static struct acpi_driver acpi_battery_driver = {
897 .class = ACPI_BATTERY_CLASS,
898 .ids = battery_device_ids,
900 .add = acpi_battery_add,
901 .resume = acpi_battery_resume,
902 .remove = acpi_battery_remove,
906 static int __init acpi_battery_init(void)
910 #ifdef CONFIG_ACPI_PROCFS_POWER
911 acpi_battery_dir = acpi_lock_battery_dir();
912 if (!acpi_battery_dir)
915 if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
916 #ifdef CONFIG_ACPI_PROCFS_POWER
917 acpi_unlock_battery_dir(acpi_battery_dir);
924 static void __exit acpi_battery_exit(void)
926 acpi_bus_unregister_driver(&acpi_battery_driver);
927 #ifdef CONFIG_ACPI_PROCFS_POWER
928 acpi_unlock_battery_dir(acpi_battery_dir);
932 module_init(acpi_battery_init);
933 module_exit(acpi_battery_exit);