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_get_property(struct power_supply
*psy
,
142 enum power_supply_property psp
,
143 union power_supply_propval
*val
)
145 struct acpi_battery
*battery
= to_acpi_battery(psy
);
147 if (acpi_battery_present(battery
)) {
148 /* run battery update only if it is present */
149 acpi_battery_get_state(battery
);
150 } else if (psp
!= POWER_SUPPLY_PROP_PRESENT
)
153 case POWER_SUPPLY_PROP_STATUS
:
154 if (battery
->state
& 0x01)
155 val
->intval
= POWER_SUPPLY_STATUS_DISCHARGING
;
156 else if (battery
->state
& 0x02)
157 val
->intval
= POWER_SUPPLY_STATUS_CHARGING
;
158 else if (battery
->state
== 0)
159 val
->intval
= POWER_SUPPLY_STATUS_FULL
;
161 val
->intval
= POWER_SUPPLY_STATUS_UNKNOWN
;
163 case POWER_SUPPLY_PROP_PRESENT
:
164 val
->intval
= acpi_battery_present(battery
);
166 case POWER_SUPPLY_PROP_TECHNOLOGY
:
167 val
->intval
= acpi_battery_technology(battery
);
169 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN
:
170 val
->intval
= battery
->design_voltage
* 1000;
172 case POWER_SUPPLY_PROP_VOLTAGE_NOW
:
173 val
->intval
= battery
->voltage_now
* 1000;
175 case POWER_SUPPLY_PROP_CURRENT_NOW
:
176 val
->intval
= battery
->current_now
* 1000;
177 /* if power units are mW, convert to mA by
178 dividing by current voltage (mV/1000) */
179 if (!battery
->power_unit
) {
180 if (battery
->voltage_now
) {
181 val
->intval
/= battery
->voltage_now
;
187 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN
:
188 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN
:
189 val
->intval
= battery
->design_capacity
* 1000;
191 case POWER_SUPPLY_PROP_CHARGE_FULL
:
192 case POWER_SUPPLY_PROP_ENERGY_FULL
:
193 val
->intval
= battery
->full_charge_capacity
* 1000;
195 case POWER_SUPPLY_PROP_CHARGE_NOW
:
196 case POWER_SUPPLY_PROP_ENERGY_NOW
:
197 val
->intval
= battery
->capacity_now
* 1000;
199 case POWER_SUPPLY_PROP_MODEL_NAME
:
200 val
->strval
= battery
->model_number
;
202 case POWER_SUPPLY_PROP_MANUFACTURER
:
203 val
->strval
= battery
->oem_info
;
205 case POWER_SUPPLY_PROP_SERIAL_NUMBER
:
206 val
->strval
= battery
->serial_number
;
214 static enum power_supply_property charge_battery_props
[] = {
215 POWER_SUPPLY_PROP_STATUS
,
216 POWER_SUPPLY_PROP_PRESENT
,
217 POWER_SUPPLY_PROP_TECHNOLOGY
,
218 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN
,
219 POWER_SUPPLY_PROP_VOLTAGE_NOW
,
220 POWER_SUPPLY_PROP_CURRENT_NOW
,
221 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN
,
222 POWER_SUPPLY_PROP_CHARGE_FULL
,
223 POWER_SUPPLY_PROP_CHARGE_NOW
,
224 POWER_SUPPLY_PROP_MODEL_NAME
,
225 POWER_SUPPLY_PROP_MANUFACTURER
,
226 POWER_SUPPLY_PROP_SERIAL_NUMBER
,
229 static enum power_supply_property energy_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_ENERGY_FULL_DESIGN
,
237 POWER_SUPPLY_PROP_ENERGY_FULL
,
238 POWER_SUPPLY_PROP_ENERGY_NOW
,
239 POWER_SUPPLY_PROP_MODEL_NAME
,
240 POWER_SUPPLY_PROP_MANUFACTURER
,
241 POWER_SUPPLY_PROP_SERIAL_NUMBER
,
245 #ifdef CONFIG_ACPI_PROCFS_POWER
246 inline char *acpi_battery_units(struct acpi_battery
*battery
)
248 return (battery
->power_unit
)?"mA":"mW";
252 /* --------------------------------------------------------------------------
254 -------------------------------------------------------------------------- */
255 struct acpi_offsets
{
256 size_t offset
; /* offset inside struct acpi_sbs_battery */
257 u8 mode
; /* int or string? */
260 static struct acpi_offsets state_offsets
[] = {
261 {offsetof(struct acpi_battery
, state
), 0},
262 {offsetof(struct acpi_battery
, current_now
), 0},
263 {offsetof(struct acpi_battery
, capacity_now
), 0},
264 {offsetof(struct acpi_battery
, voltage_now
), 0},
267 static struct acpi_offsets info_offsets
[] = {
268 {offsetof(struct acpi_battery
, power_unit
), 0},
269 {offsetof(struct acpi_battery
, design_capacity
), 0},
270 {offsetof(struct acpi_battery
, full_charge_capacity
), 0},
271 {offsetof(struct acpi_battery
, technology
), 0},
272 {offsetof(struct acpi_battery
, design_voltage
), 0},
273 {offsetof(struct acpi_battery
, design_capacity_warning
), 0},
274 {offsetof(struct acpi_battery
, design_capacity_low
), 0},
275 {offsetof(struct acpi_battery
, capacity_granularity_1
), 0},
276 {offsetof(struct acpi_battery
, capacity_granularity_2
), 0},
277 {offsetof(struct acpi_battery
, model_number
), 1},
278 {offsetof(struct acpi_battery
, serial_number
), 1},
279 {offsetof(struct acpi_battery
, type
), 1},
280 {offsetof(struct acpi_battery
, oem_info
), 1},
283 static int extract_package(struct acpi_battery
*battery
,
284 union acpi_object
*package
,
285 struct acpi_offsets
*offsets
, int num
)
288 union acpi_object
*element
;
289 if (package
->type
!= ACPI_TYPE_PACKAGE
)
291 for (i
= 0; i
< num
; ++i
) {
292 if (package
->package
.count
<= i
)
294 element
= &package
->package
.elements
[i
];
295 if (offsets
[i
].mode
) {
296 u8
*ptr
= (u8
*)battery
+ offsets
[i
].offset
;
297 if (element
->type
== ACPI_TYPE_STRING
||
298 element
->type
== ACPI_TYPE_BUFFER
)
299 strncpy(ptr
, element
->string
.pointer
, 32);
300 else if (element
->type
== ACPI_TYPE_INTEGER
) {
301 strncpy(ptr
, (u8
*)&element
->integer
.value
,
302 sizeof(acpi_integer
));
303 ptr
[sizeof(acpi_integer
)] = 0;
305 *ptr
= 0; /* don't have value */
307 int *x
= (int *)((u8
*)battery
+ offsets
[i
].offset
);
308 *x
= (element
->type
== ACPI_TYPE_INTEGER
) ?
309 element
->integer
.value
: -1;
315 static int acpi_battery_get_status(struct acpi_battery
*battery
)
317 if (acpi_bus_get_status(battery
->device
)) {
318 ACPI_EXCEPTION((AE_INFO
, AE_ERROR
, "Evaluating _STA"));
324 static int acpi_battery_get_info(struct acpi_battery
*battery
)
326 int result
= -EFAULT
;
327 acpi_status status
= 0;
328 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
330 if (!acpi_battery_present(battery
))
332 mutex_lock(&battery
->lock
);
333 status
= acpi_evaluate_object(battery
->device
->handle
, "_BIF",
335 mutex_unlock(&battery
->lock
);
337 if (ACPI_FAILURE(status
)) {
338 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _BIF"));
342 result
= extract_package(battery
, buffer
.pointer
,
343 info_offsets
, ARRAY_SIZE(info_offsets
));
344 kfree(buffer
.pointer
);
348 static int acpi_battery_get_state(struct acpi_battery
*battery
)
351 acpi_status status
= 0;
352 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
354 if (!acpi_battery_present(battery
))
357 if (battery
->update_time
&&
358 time_before(jiffies
, battery
->update_time
+
359 msecs_to_jiffies(cache_time
)))
362 mutex_lock(&battery
->lock
);
363 status
= acpi_evaluate_object(battery
->device
->handle
, "_BST",
365 mutex_unlock(&battery
->lock
);
367 if (ACPI_FAILURE(status
)) {
368 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _BST"));
372 result
= extract_package(battery
, buffer
.pointer
,
373 state_offsets
, ARRAY_SIZE(state_offsets
));
374 battery
->update_time
= jiffies
;
375 kfree(buffer
.pointer
);
379 static int acpi_battery_set_alarm(struct acpi_battery
*battery
)
381 acpi_status status
= 0;
382 union acpi_object arg0
= { .type
= ACPI_TYPE_INTEGER
};
383 struct acpi_object_list arg_list
= { 1, &arg0
};
385 if (!acpi_battery_present(battery
)|| !battery
->alarm_present
)
388 arg0
.integer
.value
= battery
->alarm
;
390 mutex_lock(&battery
->lock
);
391 status
= acpi_evaluate_object(battery
->device
->handle
, "_BTP",
393 mutex_unlock(&battery
->lock
);
395 if (ACPI_FAILURE(status
))
398 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Alarm set to %d\n", battery
->alarm
));
402 static int acpi_battery_init_alarm(struct acpi_battery
*battery
)
404 acpi_status status
= AE_OK
;
405 acpi_handle handle
= NULL
;
407 /* See if alarms are supported, and if so, set default */
408 status
= acpi_get_handle(battery
->device
->handle
, "_BTP", &handle
);
409 if (ACPI_FAILURE(status
)) {
410 battery
->alarm_present
= 0;
413 battery
->alarm_present
= 1;
415 battery
->alarm
= battery
->design_capacity_warning
;
416 return acpi_battery_set_alarm(battery
);
419 #ifdef CONFIG_ACPI_SYSFS_POWER
420 static ssize_t
acpi_battery_alarm_show(struct device
*dev
,
421 struct device_attribute
*attr
,
424 struct acpi_battery
*battery
= to_acpi_battery(dev_get_drvdata(dev
));
425 return sprintf(buf
, "%d\n", battery
->alarm
* 1000);
428 static ssize_t
acpi_battery_alarm_store(struct device
*dev
,
429 struct device_attribute
*attr
,
430 const char *buf
, size_t count
)
433 struct acpi_battery
*battery
= to_acpi_battery(dev_get_drvdata(dev
));
434 if (sscanf(buf
, "%ld\n", &x
) == 1)
435 battery
->alarm
= x
/1000;
436 if (acpi_battery_present(battery
))
437 acpi_battery_set_alarm(battery
);
441 static struct device_attribute alarm_attr
= {
442 .attr
= {.name
= "alarm", .mode
= 0644},
443 .show
= acpi_battery_alarm_show
,
444 .store
= acpi_battery_alarm_store
,
447 static int sysfs_add_battery(struct acpi_battery
*battery
)
451 if (battery
->power_unit
) {
452 battery
->bat
.properties
= charge_battery_props
;
453 battery
->bat
.num_properties
=
454 ARRAY_SIZE(charge_battery_props
);
456 battery
->bat
.properties
= energy_battery_props
;
457 battery
->bat
.num_properties
=
458 ARRAY_SIZE(energy_battery_props
);
461 battery
->bat
.name
= acpi_device_bid(battery
->device
);
462 battery
->bat
.type
= POWER_SUPPLY_TYPE_BATTERY
;
463 battery
->bat
.get_property
= acpi_battery_get_property
;
465 result
= power_supply_register(&battery
->device
->dev
, &battery
->bat
);
468 return device_create_file(battery
->bat
.dev
, &alarm_attr
);
471 static void sysfs_remove_battery(struct acpi_battery
*battery
)
473 if (!battery
->bat
.dev
)
475 device_remove_file(battery
->bat
.dev
, &alarm_attr
);
476 power_supply_unregister(&battery
->bat
);
477 battery
->bat
.dev
= NULL
;
481 static int acpi_battery_update(struct acpi_battery
*battery
)
484 result
= acpi_battery_get_status(battery
);
487 #ifdef CONFIG_ACPI_SYSFS_POWER
488 if (!acpi_battery_present(battery
)) {
489 sysfs_remove_battery(battery
);
490 battery
->update_time
= 0;
494 if (!battery
->update_time
) {
495 result
= acpi_battery_get_info(battery
);
498 acpi_battery_init_alarm(battery
);
500 #ifdef CONFIG_ACPI_SYSFS_POWER
501 if (!battery
->bat
.dev
)
502 sysfs_add_battery(battery
);
504 return acpi_battery_get_state(battery
);
507 /* --------------------------------------------------------------------------
509 -------------------------------------------------------------------------- */
511 #ifdef CONFIG_ACPI_PROCFS_POWER
512 static struct proc_dir_entry
*acpi_battery_dir
;
514 static int acpi_battery_print_info(struct seq_file
*seq
, int result
)
516 struct acpi_battery
*battery
= seq
->private;
521 seq_printf(seq
, "present: %s\n",
522 acpi_battery_present(battery
)?"yes":"no");
523 if (!acpi_battery_present(battery
))
525 if (battery
->design_capacity
== ACPI_BATTERY_VALUE_UNKNOWN
)
526 seq_printf(seq
, "design capacity: unknown\n");
528 seq_printf(seq
, "design capacity: %d %sh\n",
529 battery
->design_capacity
,
530 acpi_battery_units(battery
));
532 if (battery
->full_charge_capacity
== ACPI_BATTERY_VALUE_UNKNOWN
)
533 seq_printf(seq
, "last full capacity: unknown\n");
535 seq_printf(seq
, "last full capacity: %d %sh\n",
536 battery
->full_charge_capacity
,
537 acpi_battery_units(battery
));
539 seq_printf(seq
, "battery technology: %srechargeable\n",
540 (!battery
->technology
)?"non-":"");
542 if (battery
->design_voltage
== ACPI_BATTERY_VALUE_UNKNOWN
)
543 seq_printf(seq
, "design voltage: unknown\n");
545 seq_printf(seq
, "design voltage: %d mV\n",
546 battery
->design_voltage
);
547 seq_printf(seq
, "design capacity warning: %d %sh\n",
548 battery
->design_capacity_warning
,
549 acpi_battery_units(battery
));
550 seq_printf(seq
, "design capacity low: %d %sh\n",
551 battery
->design_capacity_low
,
552 acpi_battery_units(battery
));
553 seq_printf(seq
, "capacity granularity 1: %d %sh\n",
554 battery
->capacity_granularity_1
,
555 acpi_battery_units(battery
));
556 seq_printf(seq
, "capacity granularity 2: %d %sh\n",
557 battery
->capacity_granularity_2
,
558 acpi_battery_units(battery
));
559 seq_printf(seq
, "model number: %s\n", battery
->model_number
);
560 seq_printf(seq
, "serial number: %s\n", battery
->serial_number
);
561 seq_printf(seq
, "battery type: %s\n", battery
->type
);
562 seq_printf(seq
, "OEM info: %s\n", battery
->oem_info
);
565 seq_printf(seq
, "ERROR: Unable to read battery info\n");
569 static int acpi_battery_print_state(struct seq_file
*seq
, int result
)
571 struct acpi_battery
*battery
= seq
->private;
576 seq_printf(seq
, "present: %s\n",
577 acpi_battery_present(battery
)?"yes":"no");
578 if (!acpi_battery_present(battery
))
581 seq_printf(seq
, "capacity state: %s\n",
582 (battery
->state
& 0x04)?"critical":"ok");
583 if ((battery
->state
& 0x01) && (battery
->state
& 0x02))
585 "charging state: charging/discharging\n");
586 else if (battery
->state
& 0x01)
587 seq_printf(seq
, "charging state: discharging\n");
588 else if (battery
->state
& 0x02)
589 seq_printf(seq
, "charging state: charging\n");
591 seq_printf(seq
, "charging state: charged\n");
593 if (battery
->current_now
== ACPI_BATTERY_VALUE_UNKNOWN
)
594 seq_printf(seq
, "present rate: unknown\n");
596 seq_printf(seq
, "present rate: %d %s\n",
597 battery
->current_now
, acpi_battery_units(battery
));
599 if (battery
->capacity_now
== ACPI_BATTERY_VALUE_UNKNOWN
)
600 seq_printf(seq
, "remaining capacity: unknown\n");
602 seq_printf(seq
, "remaining capacity: %d %sh\n",
603 battery
->capacity_now
, acpi_battery_units(battery
));
604 if (battery
->voltage_now
== ACPI_BATTERY_VALUE_UNKNOWN
)
605 seq_printf(seq
, "present voltage: unknown\n");
607 seq_printf(seq
, "present voltage: %d mV\n",
608 battery
->voltage_now
);
611 seq_printf(seq
, "ERROR: Unable to read battery state\n");
616 static int acpi_battery_print_alarm(struct seq_file
*seq
, int result
)
618 struct acpi_battery
*battery
= seq
->private;
623 if (!acpi_battery_present(battery
)) {
624 seq_printf(seq
, "present: no\n");
627 seq_printf(seq
, "alarm: ");
629 seq_printf(seq
, "unsupported\n");
631 seq_printf(seq
, "%u %sh\n", battery
->alarm
,
632 acpi_battery_units(battery
));
635 seq_printf(seq
, "ERROR: Unable to read battery alarm\n");
639 static ssize_t
acpi_battery_write_alarm(struct file
*file
,
640 const char __user
* buffer
,
641 size_t count
, loff_t
* ppos
)
644 char alarm_string
[12] = { '\0' };
645 struct seq_file
*m
= file
->private_data
;
646 struct acpi_battery
*battery
= m
->private;
648 if (!battery
|| (count
> sizeof(alarm_string
) - 1))
650 if (!acpi_battery_present(battery
)) {
654 if (copy_from_user(alarm_string
, buffer
, count
)) {
658 alarm_string
[count
] = '\0';
659 battery
->alarm
= simple_strtol(alarm_string
, NULL
, 0);
660 result
= acpi_battery_set_alarm(battery
);
667 typedef int(*print_func
)(struct seq_file
*seq
, int result
);
669 static print_func acpi_print_funcs
[ACPI_BATTERY_NUMFILES
] = {
670 acpi_battery_print_info
,
671 acpi_battery_print_state
,
672 acpi_battery_print_alarm
,
675 static int acpi_battery_read(int fid
, struct seq_file
*seq
)
677 struct acpi_battery
*battery
= seq
->private;
678 int result
= acpi_battery_update(battery
);
679 return acpi_print_funcs
[fid
](seq
, result
);
682 #define DECLARE_FILE_FUNCTIONS(_name) \
683 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
685 return acpi_battery_read(_name##_tag, seq); \
687 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
689 return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
692 DECLARE_FILE_FUNCTIONS(info
);
693 DECLARE_FILE_FUNCTIONS(state
);
694 DECLARE_FILE_FUNCTIONS(alarm
);
696 #undef DECLARE_FILE_FUNCTIONS
698 #define FILE_DESCRIPTION_RO(_name) \
700 .name = __stringify(_name), \
703 .open = acpi_battery_##_name##_open_fs, \
705 .llseek = seq_lseek, \
706 .release = single_release, \
707 .owner = THIS_MODULE, \
711 #define FILE_DESCRIPTION_RW(_name) \
713 .name = __stringify(_name), \
714 .mode = S_IFREG | S_IRUGO | S_IWUSR, \
716 .open = acpi_battery_##_name##_open_fs, \
718 .llseek = seq_lseek, \
719 .write = acpi_battery_write_##_name, \
720 .release = single_release, \
721 .owner = THIS_MODULE, \
725 static struct battery_file
{
726 struct file_operations ops
;
729 } acpi_battery_file
[] = {
730 FILE_DESCRIPTION_RO(info
),
731 FILE_DESCRIPTION_RO(state
),
732 FILE_DESCRIPTION_RW(alarm
),
735 #undef FILE_DESCRIPTION_RO
736 #undef FILE_DESCRIPTION_RW
738 static int acpi_battery_add_fs(struct acpi_device
*device
)
740 struct proc_dir_entry
*entry
= NULL
;
743 if (!acpi_device_dir(device
)) {
744 acpi_device_dir(device
) = proc_mkdir(acpi_device_bid(device
),
746 if (!acpi_device_dir(device
))
748 acpi_device_dir(device
)->owner
= THIS_MODULE
;
751 for (i
= 0; i
< ACPI_BATTERY_NUMFILES
; ++i
) {
752 entry
= proc_create_data(acpi_battery_file
[i
].name
,
753 acpi_battery_file
[i
].mode
,
754 acpi_device_dir(device
),
755 &acpi_battery_file
[i
].ops
,
756 acpi_driver_data(device
));
763 static void acpi_battery_remove_fs(struct acpi_device
*device
)
766 if (!acpi_device_dir(device
))
768 for (i
= 0; i
< ACPI_BATTERY_NUMFILES
; ++i
)
769 remove_proc_entry(acpi_battery_file
[i
].name
,
770 acpi_device_dir(device
));
772 remove_proc_entry(acpi_device_bid(device
), acpi_battery_dir
);
773 acpi_device_dir(device
) = NULL
;
778 /* --------------------------------------------------------------------------
780 -------------------------------------------------------------------------- */
782 static void acpi_battery_notify(acpi_handle handle
, u32 event
, void *data
)
784 struct acpi_battery
*battery
= data
;
785 struct acpi_device
*device
;
788 device
= battery
->device
;
789 acpi_battery_update(battery
);
790 acpi_bus_generate_proc_event(device
, event
,
791 acpi_battery_present(battery
));
792 acpi_bus_generate_netlink_event(device
->pnp
.device_class
,
793 dev_name(&device
->dev
), event
,
794 acpi_battery_present(battery
));
795 #ifdef CONFIG_ACPI_SYSFS_POWER
796 /* acpi_batter_update could remove power_supply object */
797 if (battery
->bat
.dev
)
798 kobject_uevent(&battery
->bat
.dev
->kobj
, KOBJ_CHANGE
);
802 static int acpi_battery_add(struct acpi_device
*device
)
805 acpi_status status
= 0;
806 struct acpi_battery
*battery
= NULL
;
809 battery
= kzalloc(sizeof(struct acpi_battery
), GFP_KERNEL
);
812 battery
->device
= device
;
813 strcpy(acpi_device_name(device
), ACPI_BATTERY_DEVICE_NAME
);
814 strcpy(acpi_device_class(device
), ACPI_BATTERY_CLASS
);
815 device
->driver_data
= battery
;
816 mutex_init(&battery
->lock
);
817 acpi_battery_update(battery
);
818 #ifdef CONFIG_ACPI_PROCFS_POWER
819 result
= acpi_battery_add_fs(device
);
823 status
= acpi_install_notify_handler(device
->handle
,
825 acpi_battery_notify
, battery
);
826 if (ACPI_FAILURE(status
)) {
827 ACPI_EXCEPTION((AE_INFO
, status
, "Installing notify handler"));
831 printk(KERN_INFO PREFIX
"%s Slot [%s] (battery %s)\n",
832 ACPI_BATTERY_DEVICE_NAME
, acpi_device_bid(device
),
833 device
->status
.battery_present
? "present" : "absent");
836 #ifdef CONFIG_ACPI_PROCFS_POWER
837 acpi_battery_remove_fs(device
);
844 static int acpi_battery_remove(struct acpi_device
*device
, int type
)
846 acpi_status status
= 0;
847 struct acpi_battery
*battery
= NULL
;
849 if (!device
|| !acpi_driver_data(device
))
851 battery
= acpi_driver_data(device
);
852 status
= acpi_remove_notify_handler(device
->handle
,
854 acpi_battery_notify
);
855 #ifdef CONFIG_ACPI_PROCFS_POWER
856 acpi_battery_remove_fs(device
);
858 #ifdef CONFIG_ACPI_SYSFS_POWER
859 sysfs_remove_battery(battery
);
861 mutex_destroy(&battery
->lock
);
866 /* this is needed to learn about changes made in suspended state */
867 static int acpi_battery_resume(struct acpi_device
*device
)
869 struct acpi_battery
*battery
;
872 battery
= acpi_driver_data(device
);
873 battery
->update_time
= 0;
874 acpi_battery_update(battery
);
878 static struct acpi_driver acpi_battery_driver
= {
880 .class = ACPI_BATTERY_CLASS
,
881 .ids
= battery_device_ids
,
883 .add
= acpi_battery_add
,
884 .resume
= acpi_battery_resume
,
885 .remove
= acpi_battery_remove
,
889 static int __init
acpi_battery_init(void)
893 #ifdef CONFIG_ACPI_PROCFS_POWER
894 acpi_battery_dir
= acpi_lock_battery_dir();
895 if (!acpi_battery_dir
)
898 if (acpi_bus_register_driver(&acpi_battery_driver
) < 0) {
899 #ifdef CONFIG_ACPI_PROCFS_POWER
900 acpi_unlock_battery_dir(acpi_battery_dir
);
907 static void __exit
acpi_battery_exit(void)
909 acpi_bus_unregister_driver(&acpi_battery_driver
);
910 #ifdef CONFIG_ACPI_PROCFS_POWER
911 acpi_unlock_battery_dir(acpi_battery_dir
);
915 module_init(acpi_battery_init
);
916 module_exit(acpi_battery_exit
);