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>
33 #include <linux/async.h>
34 #include <linux/dmi.h>
35 #include <linux/slab.h>
36 #include <linux/suspend.h>
38 #ifdef CONFIG_ACPI_PROCFS_POWER
39 #include <linux/proc_fs.h>
40 #include <linux/seq_file.h>
41 #include <asm/uaccess.h>
44 #include <acpi/acpi_bus.h>
45 #include <acpi/acpi_drivers.h>
46 #include <linux/power_supply.h>
48 #define PREFIX "ACPI: "
50 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
52 #define ACPI_BATTERY_CLASS "battery"
53 #define ACPI_BATTERY_DEVICE_NAME "Battery"
54 #define ACPI_BATTERY_NOTIFY_STATUS 0x80
55 #define ACPI_BATTERY_NOTIFY_INFO 0x81
56 #define ACPI_BATTERY_NOTIFY_THRESHOLD 0x82
58 /* Battery power unit: 0 means mW, 1 means mA */
59 #define ACPI_BATTERY_POWER_UNIT_MA 1
61 #define _COMPONENT ACPI_BATTERY_COMPONENT
63 ACPI_MODULE_NAME("battery");
65 MODULE_AUTHOR("Paul Diefenbaugh");
66 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
67 MODULE_DESCRIPTION("ACPI Battery Driver");
68 MODULE_LICENSE("GPL");
70 static unsigned int cache_time
= 1000;
71 module_param(cache_time
, uint
, 0644);
72 MODULE_PARM_DESC(cache_time
, "cache time in milliseconds");
74 #ifdef CONFIG_ACPI_PROCFS_POWER
75 extern struct proc_dir_entry
*acpi_lock_battery_dir(void);
76 extern void *acpi_unlock_battery_dir(struct proc_dir_entry
*acpi_battery_dir
);
78 enum acpi_battery_files
{
82 ACPI_BATTERY_NUMFILES
,
87 static const struct acpi_device_id battery_device_ids
[] = {
92 MODULE_DEVICE_TABLE(acpi
, battery_device_ids
);
95 ACPI_BATTERY_ALARM_PRESENT
,
96 ACPI_BATTERY_XINFO_PRESENT
,
97 ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY
,
100 struct acpi_battery
{
102 struct power_supply bat
;
103 struct acpi_device
*device
;
104 struct notifier_block pm_nb
;
105 unsigned long update_time
;
110 int full_charge_capacity
;
113 int design_capacity_warning
;
114 int design_capacity_low
;
116 int measurement_accuracy
;
117 int max_sampling_time
;
118 int min_sampling_time
;
119 int max_averaging_interval
;
120 int min_averaging_interval
;
121 int capacity_granularity_1
;
122 int capacity_granularity_2
;
124 char model_number
[32];
125 char serial_number
[32];
133 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
135 inline int acpi_battery_present(struct acpi_battery
*battery
)
137 return battery
->device
->status
.battery_present
;
140 static int acpi_battery_technology(struct acpi_battery
*battery
)
142 if (!strcasecmp("NiCd", battery
->type
))
143 return POWER_SUPPLY_TECHNOLOGY_NiCd
;
144 if (!strcasecmp("NiMH", battery
->type
))
145 return POWER_SUPPLY_TECHNOLOGY_NiMH
;
146 if (!strcasecmp("LION", battery
->type
))
147 return POWER_SUPPLY_TECHNOLOGY_LION
;
148 if (!strncasecmp("LI-ION", battery
->type
, 6))
149 return POWER_SUPPLY_TECHNOLOGY_LION
;
150 if (!strcasecmp("LiP", battery
->type
))
151 return POWER_SUPPLY_TECHNOLOGY_LIPO
;
152 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN
;
155 static int acpi_battery_get_state(struct acpi_battery
*battery
);
157 static int acpi_battery_is_charged(struct acpi_battery
*battery
)
159 /* either charging or discharging */
160 if (battery
->state
!= 0)
163 /* battery not reporting charge */
164 if (battery
->capacity_now
== ACPI_BATTERY_VALUE_UNKNOWN
||
165 battery
->capacity_now
== 0)
168 /* good batteries update full_charge as the batteries degrade */
169 if (battery
->full_charge_capacity
== battery
->capacity_now
)
172 /* fallback to using design values for broken batteries */
173 if (battery
->design_capacity
== battery
->capacity_now
)
176 /* we don't do any sort of metric based on percentages */
180 static int acpi_battery_get_property(struct power_supply
*psy
,
181 enum power_supply_property psp
,
182 union power_supply_propval
*val
)
185 struct acpi_battery
*battery
= to_acpi_battery(psy
);
187 if (acpi_battery_present(battery
)) {
188 /* run battery update only if it is present */
189 acpi_battery_get_state(battery
);
190 } else if (psp
!= POWER_SUPPLY_PROP_PRESENT
)
193 case POWER_SUPPLY_PROP_STATUS
:
194 if (battery
->state
& 0x01)
195 val
->intval
= POWER_SUPPLY_STATUS_DISCHARGING
;
196 else if (battery
->state
& 0x02)
197 val
->intval
= POWER_SUPPLY_STATUS_CHARGING
;
198 else if (acpi_battery_is_charged(battery
))
199 val
->intval
= POWER_SUPPLY_STATUS_FULL
;
201 val
->intval
= POWER_SUPPLY_STATUS_UNKNOWN
;
203 case POWER_SUPPLY_PROP_PRESENT
:
204 val
->intval
= acpi_battery_present(battery
);
206 case POWER_SUPPLY_PROP_TECHNOLOGY
:
207 val
->intval
= acpi_battery_technology(battery
);
209 case POWER_SUPPLY_PROP_CYCLE_COUNT
:
210 val
->intval
= battery
->cycle_count
;
212 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN
:
213 if (battery
->design_voltage
== ACPI_BATTERY_VALUE_UNKNOWN
)
216 val
->intval
= battery
->design_voltage
* 1000;
218 case POWER_SUPPLY_PROP_VOLTAGE_NOW
:
219 if (battery
->voltage_now
== ACPI_BATTERY_VALUE_UNKNOWN
)
222 val
->intval
= battery
->voltage_now
* 1000;
224 case POWER_SUPPLY_PROP_CURRENT_NOW
:
225 case POWER_SUPPLY_PROP_POWER_NOW
:
226 if (battery
->rate_now
== ACPI_BATTERY_VALUE_UNKNOWN
)
229 val
->intval
= battery
->rate_now
* 1000;
231 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN
:
232 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN
:
233 if (battery
->design_capacity
== ACPI_BATTERY_VALUE_UNKNOWN
)
236 val
->intval
= battery
->design_capacity
* 1000;
238 case POWER_SUPPLY_PROP_CHARGE_FULL
:
239 case POWER_SUPPLY_PROP_ENERGY_FULL
:
240 if (battery
->full_charge_capacity
== ACPI_BATTERY_VALUE_UNKNOWN
)
243 val
->intval
= battery
->full_charge_capacity
* 1000;
245 case POWER_SUPPLY_PROP_CHARGE_NOW
:
246 case POWER_SUPPLY_PROP_ENERGY_NOW
:
247 if (battery
->capacity_now
== ACPI_BATTERY_VALUE_UNKNOWN
)
250 val
->intval
= battery
->capacity_now
* 1000;
252 case POWER_SUPPLY_PROP_MODEL_NAME
:
253 val
->strval
= battery
->model_number
;
255 case POWER_SUPPLY_PROP_MANUFACTURER
:
256 val
->strval
= battery
->oem_info
;
258 case POWER_SUPPLY_PROP_SERIAL_NUMBER
:
259 val
->strval
= battery
->serial_number
;
267 static enum power_supply_property charge_battery_props
[] = {
268 POWER_SUPPLY_PROP_STATUS
,
269 POWER_SUPPLY_PROP_PRESENT
,
270 POWER_SUPPLY_PROP_TECHNOLOGY
,
271 POWER_SUPPLY_PROP_CYCLE_COUNT
,
272 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN
,
273 POWER_SUPPLY_PROP_VOLTAGE_NOW
,
274 POWER_SUPPLY_PROP_CURRENT_NOW
,
275 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN
,
276 POWER_SUPPLY_PROP_CHARGE_FULL
,
277 POWER_SUPPLY_PROP_CHARGE_NOW
,
278 POWER_SUPPLY_PROP_MODEL_NAME
,
279 POWER_SUPPLY_PROP_MANUFACTURER
,
280 POWER_SUPPLY_PROP_SERIAL_NUMBER
,
283 static enum power_supply_property energy_battery_props
[] = {
284 POWER_SUPPLY_PROP_STATUS
,
285 POWER_SUPPLY_PROP_PRESENT
,
286 POWER_SUPPLY_PROP_TECHNOLOGY
,
287 POWER_SUPPLY_PROP_CYCLE_COUNT
,
288 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN
,
289 POWER_SUPPLY_PROP_VOLTAGE_NOW
,
290 POWER_SUPPLY_PROP_POWER_NOW
,
291 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN
,
292 POWER_SUPPLY_PROP_ENERGY_FULL
,
293 POWER_SUPPLY_PROP_ENERGY_NOW
,
294 POWER_SUPPLY_PROP_MODEL_NAME
,
295 POWER_SUPPLY_PROP_MANUFACTURER
,
296 POWER_SUPPLY_PROP_SERIAL_NUMBER
,
299 #ifdef CONFIG_ACPI_PROCFS_POWER
300 inline char *acpi_battery_units(struct acpi_battery
*battery
)
302 return (battery
->power_unit
== ACPI_BATTERY_POWER_UNIT_MA
) ?
307 /* --------------------------------------------------------------------------
309 -------------------------------------------------------------------------- */
310 struct acpi_offsets
{
311 size_t offset
; /* offset inside struct acpi_sbs_battery */
312 u8 mode
; /* int or string? */
315 static struct acpi_offsets state_offsets
[] = {
316 {offsetof(struct acpi_battery
, state
), 0},
317 {offsetof(struct acpi_battery
, rate_now
), 0},
318 {offsetof(struct acpi_battery
, capacity_now
), 0},
319 {offsetof(struct acpi_battery
, voltage_now
), 0},
322 static struct acpi_offsets info_offsets
[] = {
323 {offsetof(struct acpi_battery
, power_unit
), 0},
324 {offsetof(struct acpi_battery
, design_capacity
), 0},
325 {offsetof(struct acpi_battery
, full_charge_capacity
), 0},
326 {offsetof(struct acpi_battery
, technology
), 0},
327 {offsetof(struct acpi_battery
, design_voltage
), 0},
328 {offsetof(struct acpi_battery
, design_capacity_warning
), 0},
329 {offsetof(struct acpi_battery
, design_capacity_low
), 0},
330 {offsetof(struct acpi_battery
, capacity_granularity_1
), 0},
331 {offsetof(struct acpi_battery
, capacity_granularity_2
), 0},
332 {offsetof(struct acpi_battery
, model_number
), 1},
333 {offsetof(struct acpi_battery
, serial_number
), 1},
334 {offsetof(struct acpi_battery
, type
), 1},
335 {offsetof(struct acpi_battery
, oem_info
), 1},
338 static struct acpi_offsets extended_info_offsets
[] = {
339 {offsetof(struct acpi_battery
, power_unit
), 0},
340 {offsetof(struct acpi_battery
, design_capacity
), 0},
341 {offsetof(struct acpi_battery
, full_charge_capacity
), 0},
342 {offsetof(struct acpi_battery
, technology
), 0},
343 {offsetof(struct acpi_battery
, design_voltage
), 0},
344 {offsetof(struct acpi_battery
, design_capacity_warning
), 0},
345 {offsetof(struct acpi_battery
, design_capacity_low
), 0},
346 {offsetof(struct acpi_battery
, cycle_count
), 0},
347 {offsetof(struct acpi_battery
, measurement_accuracy
), 0},
348 {offsetof(struct acpi_battery
, max_sampling_time
), 0},
349 {offsetof(struct acpi_battery
, min_sampling_time
), 0},
350 {offsetof(struct acpi_battery
, max_averaging_interval
), 0},
351 {offsetof(struct acpi_battery
, min_averaging_interval
), 0},
352 {offsetof(struct acpi_battery
, capacity_granularity_1
), 0},
353 {offsetof(struct acpi_battery
, capacity_granularity_2
), 0},
354 {offsetof(struct acpi_battery
, model_number
), 1},
355 {offsetof(struct acpi_battery
, serial_number
), 1},
356 {offsetof(struct acpi_battery
, type
), 1},
357 {offsetof(struct acpi_battery
, oem_info
), 1},
360 static int extract_package(struct acpi_battery
*battery
,
361 union acpi_object
*package
,
362 struct acpi_offsets
*offsets
, int num
)
365 union acpi_object
*element
;
366 if (package
->type
!= ACPI_TYPE_PACKAGE
)
368 for (i
= 0; i
< num
; ++i
) {
369 if (package
->package
.count
<= i
)
371 element
= &package
->package
.elements
[i
];
372 if (offsets
[i
].mode
) {
373 u8
*ptr
= (u8
*)battery
+ offsets
[i
].offset
;
374 if (element
->type
== ACPI_TYPE_STRING
||
375 element
->type
== ACPI_TYPE_BUFFER
)
376 strncpy(ptr
, element
->string
.pointer
, 32);
377 else if (element
->type
== ACPI_TYPE_INTEGER
) {
378 strncpy(ptr
, (u8
*)&element
->integer
.value
,
380 ptr
[sizeof(u64
)] = 0;
382 *ptr
= 0; /* don't have value */
384 int *x
= (int *)((u8
*)battery
+ offsets
[i
].offset
);
385 *x
= (element
->type
== ACPI_TYPE_INTEGER
) ?
386 element
->integer
.value
: -1;
392 static int acpi_battery_get_status(struct acpi_battery
*battery
)
394 if (acpi_bus_get_status(battery
->device
)) {
395 ACPI_EXCEPTION((AE_INFO
, AE_ERROR
, "Evaluating _STA"));
401 static int acpi_battery_get_info(struct acpi_battery
*battery
)
403 int result
= -EFAULT
;
404 acpi_status status
= 0;
405 char *name
= test_bit(ACPI_BATTERY_XINFO_PRESENT
, &battery
->flags
)?
408 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
410 if (!acpi_battery_present(battery
))
412 mutex_lock(&battery
->lock
);
413 status
= acpi_evaluate_object(battery
->device
->handle
, name
,
415 mutex_unlock(&battery
->lock
);
417 if (ACPI_FAILURE(status
)) {
418 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating %s", name
));
421 if (test_bit(ACPI_BATTERY_XINFO_PRESENT
, &battery
->flags
))
422 result
= extract_package(battery
, buffer
.pointer
,
423 extended_info_offsets
,
424 ARRAY_SIZE(extended_info_offsets
));
426 result
= extract_package(battery
, buffer
.pointer
,
427 info_offsets
, ARRAY_SIZE(info_offsets
));
428 kfree(buffer
.pointer
);
429 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY
, &battery
->flags
))
430 battery
->full_charge_capacity
= battery
->design_capacity
;
434 static int acpi_battery_get_state(struct acpi_battery
*battery
)
437 acpi_status status
= 0;
438 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
440 if (!acpi_battery_present(battery
))
443 if (battery
->update_time
&&
444 time_before(jiffies
, battery
->update_time
+
445 msecs_to_jiffies(cache_time
)))
448 mutex_lock(&battery
->lock
);
449 status
= acpi_evaluate_object(battery
->device
->handle
, "_BST",
451 mutex_unlock(&battery
->lock
);
453 if (ACPI_FAILURE(status
)) {
454 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _BST"));
458 result
= extract_package(battery
, buffer
.pointer
,
459 state_offsets
, ARRAY_SIZE(state_offsets
));
460 battery
->update_time
= jiffies
;
461 kfree(buffer
.pointer
);
463 /* For buggy DSDTs that report negative 16-bit values for either
464 * charging or discharging current and/or report 0 as 65536
467 if (battery
->power_unit
== ACPI_BATTERY_POWER_UNIT_MA
&&
468 battery
->rate_now
!= ACPI_BATTERY_VALUE_UNKNOWN
&&
469 (s16
)(battery
->rate_now
) < 0) {
470 battery
->rate_now
= abs((s16
)battery
->rate_now
);
471 printk_once(KERN_WARNING FW_BUG
"battery: (dis)charge rate"
475 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY
, &battery
->flags
)
476 && battery
->capacity_now
>= 0 && battery
->capacity_now
<= 100)
477 battery
->capacity_now
= (battery
->capacity_now
*
478 battery
->full_charge_capacity
) / 100;
482 static int acpi_battery_set_alarm(struct acpi_battery
*battery
)
484 acpi_status status
= 0;
485 union acpi_object arg0
= { .type
= ACPI_TYPE_INTEGER
};
486 struct acpi_object_list arg_list
= { 1, &arg0
};
488 if (!acpi_battery_present(battery
) ||
489 !test_bit(ACPI_BATTERY_ALARM_PRESENT
, &battery
->flags
))
492 arg0
.integer
.value
= battery
->alarm
;
494 mutex_lock(&battery
->lock
);
495 status
= acpi_evaluate_object(battery
->device
->handle
, "_BTP",
497 mutex_unlock(&battery
->lock
);
499 if (ACPI_FAILURE(status
))
502 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Alarm set to %d\n", battery
->alarm
));
506 static int acpi_battery_init_alarm(struct acpi_battery
*battery
)
508 acpi_status status
= AE_OK
;
509 acpi_handle handle
= NULL
;
511 /* See if alarms are supported, and if so, set default */
512 status
= acpi_get_handle(battery
->device
->handle
, "_BTP", &handle
);
513 if (ACPI_FAILURE(status
)) {
514 clear_bit(ACPI_BATTERY_ALARM_PRESENT
, &battery
->flags
);
517 set_bit(ACPI_BATTERY_ALARM_PRESENT
, &battery
->flags
);
519 battery
->alarm
= battery
->design_capacity_warning
;
520 return acpi_battery_set_alarm(battery
);
523 static ssize_t
acpi_battery_alarm_show(struct device
*dev
,
524 struct device_attribute
*attr
,
527 struct acpi_battery
*battery
= to_acpi_battery(dev_get_drvdata(dev
));
528 return sprintf(buf
, "%d\n", battery
->alarm
* 1000);
531 static ssize_t
acpi_battery_alarm_store(struct device
*dev
,
532 struct device_attribute
*attr
,
533 const char *buf
, size_t count
)
536 struct acpi_battery
*battery
= to_acpi_battery(dev_get_drvdata(dev
));
537 if (sscanf(buf
, "%ld\n", &x
) == 1)
538 battery
->alarm
= x
/1000;
539 if (acpi_battery_present(battery
))
540 acpi_battery_set_alarm(battery
);
544 static struct device_attribute alarm_attr
= {
545 .attr
= {.name
= "alarm", .mode
= 0644},
546 .show
= acpi_battery_alarm_show
,
547 .store
= acpi_battery_alarm_store
,
550 static int sysfs_add_battery(struct acpi_battery
*battery
)
554 if (battery
->power_unit
== ACPI_BATTERY_POWER_UNIT_MA
) {
555 battery
->bat
.properties
= charge_battery_props
;
556 battery
->bat
.num_properties
=
557 ARRAY_SIZE(charge_battery_props
);
559 battery
->bat
.properties
= energy_battery_props
;
560 battery
->bat
.num_properties
=
561 ARRAY_SIZE(energy_battery_props
);
564 battery
->bat
.name
= acpi_device_bid(battery
->device
);
565 battery
->bat
.type
= POWER_SUPPLY_TYPE_BATTERY
;
566 battery
->bat
.get_property
= acpi_battery_get_property
;
568 result
= power_supply_register(&battery
->device
->dev
, &battery
->bat
);
571 return device_create_file(battery
->bat
.dev
, &alarm_attr
);
574 static void sysfs_remove_battery(struct acpi_battery
*battery
)
576 mutex_lock(&battery
->lock
);
577 if (!battery
->bat
.dev
) {
578 mutex_unlock(&battery
->lock
);
582 device_remove_file(battery
->bat
.dev
, &alarm_attr
);
583 power_supply_unregister(&battery
->bat
);
584 battery
->bat
.dev
= NULL
;
585 mutex_unlock(&battery
->lock
);
589 * According to the ACPI spec, some kinds of primary batteries can
590 * report percentage battery remaining capacity directly to OS.
591 * In this case, it reports the Last Full Charged Capacity == 100
592 * and BatteryPresentRate == 0xFFFFFFFF.
594 * Now we found some battery reports percentage remaining capacity
595 * even if it's rechargeable.
596 * https://bugzilla.kernel.org/show_bug.cgi?id=15979
598 * Handle this correctly so that they won't break userspace.
600 static void acpi_battery_quirks(struct acpi_battery
*battery
)
602 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY
, &battery
->flags
))
605 if (battery
->full_charge_capacity
== 100 &&
606 battery
->rate_now
== ACPI_BATTERY_VALUE_UNKNOWN
&&
607 battery
->capacity_now
>=0 && battery
->capacity_now
<= 100) {
608 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY
, &battery
->flags
);
609 battery
->full_charge_capacity
= battery
->design_capacity
;
610 battery
->capacity_now
= (battery
->capacity_now
*
611 battery
->full_charge_capacity
) / 100;
615 static int acpi_battery_update(struct acpi_battery
*battery
)
617 int result
, old_present
= acpi_battery_present(battery
);
618 result
= acpi_battery_get_status(battery
);
621 if (!acpi_battery_present(battery
)) {
622 sysfs_remove_battery(battery
);
623 battery
->update_time
= 0;
626 if (!battery
->update_time
||
627 old_present
!= acpi_battery_present(battery
)) {
628 result
= acpi_battery_get_info(battery
);
631 acpi_battery_init_alarm(battery
);
633 if (!battery
->bat
.dev
) {
634 result
= sysfs_add_battery(battery
);
638 result
= acpi_battery_get_state(battery
);
639 acpi_battery_quirks(battery
);
643 static void acpi_battery_refresh(struct acpi_battery
*battery
)
645 if (!battery
->bat
.dev
)
648 acpi_battery_get_info(battery
);
649 /* The battery may have changed its reporting units. */
650 sysfs_remove_battery(battery
);
651 sysfs_add_battery(battery
);
654 /* --------------------------------------------------------------------------
656 -------------------------------------------------------------------------- */
658 #ifdef CONFIG_ACPI_PROCFS_POWER
659 static struct proc_dir_entry
*acpi_battery_dir
;
661 static int acpi_battery_print_info(struct seq_file
*seq
, int result
)
663 struct acpi_battery
*battery
= seq
->private;
668 seq_printf(seq
, "present: %s\n",
669 acpi_battery_present(battery
)?"yes":"no");
670 if (!acpi_battery_present(battery
))
672 if (battery
->design_capacity
== ACPI_BATTERY_VALUE_UNKNOWN
)
673 seq_printf(seq
, "design capacity: unknown\n");
675 seq_printf(seq
, "design capacity: %d %sh\n",
676 battery
->design_capacity
,
677 acpi_battery_units(battery
));
679 if (battery
->full_charge_capacity
== ACPI_BATTERY_VALUE_UNKNOWN
)
680 seq_printf(seq
, "last full capacity: unknown\n");
682 seq_printf(seq
, "last full capacity: %d %sh\n",
683 battery
->full_charge_capacity
,
684 acpi_battery_units(battery
));
686 seq_printf(seq
, "battery technology: %srechargeable\n",
687 (!battery
->technology
)?"non-":"");
689 if (battery
->design_voltage
== ACPI_BATTERY_VALUE_UNKNOWN
)
690 seq_printf(seq
, "design voltage: unknown\n");
692 seq_printf(seq
, "design voltage: %d mV\n",
693 battery
->design_voltage
);
694 seq_printf(seq
, "design capacity warning: %d %sh\n",
695 battery
->design_capacity_warning
,
696 acpi_battery_units(battery
));
697 seq_printf(seq
, "design capacity low: %d %sh\n",
698 battery
->design_capacity_low
,
699 acpi_battery_units(battery
));
700 seq_printf(seq
, "cycle count: %i\n", battery
->cycle_count
);
701 seq_printf(seq
, "capacity granularity 1: %d %sh\n",
702 battery
->capacity_granularity_1
,
703 acpi_battery_units(battery
));
704 seq_printf(seq
, "capacity granularity 2: %d %sh\n",
705 battery
->capacity_granularity_2
,
706 acpi_battery_units(battery
));
707 seq_printf(seq
, "model number: %s\n", battery
->model_number
);
708 seq_printf(seq
, "serial number: %s\n", battery
->serial_number
);
709 seq_printf(seq
, "battery type: %s\n", battery
->type
);
710 seq_printf(seq
, "OEM info: %s\n", battery
->oem_info
);
713 seq_printf(seq
, "ERROR: Unable to read battery info\n");
717 static int acpi_battery_print_state(struct seq_file
*seq
, int result
)
719 struct acpi_battery
*battery
= seq
->private;
724 seq_printf(seq
, "present: %s\n",
725 acpi_battery_present(battery
)?"yes":"no");
726 if (!acpi_battery_present(battery
))
729 seq_printf(seq
, "capacity state: %s\n",
730 (battery
->state
& 0x04)?"critical":"ok");
731 if ((battery
->state
& 0x01) && (battery
->state
& 0x02))
733 "charging state: charging/discharging\n");
734 else if (battery
->state
& 0x01)
735 seq_printf(seq
, "charging state: discharging\n");
736 else if (battery
->state
& 0x02)
737 seq_printf(seq
, "charging state: charging\n");
739 seq_printf(seq
, "charging state: charged\n");
741 if (battery
->rate_now
== ACPI_BATTERY_VALUE_UNKNOWN
)
742 seq_printf(seq
, "present rate: unknown\n");
744 seq_printf(seq
, "present rate: %d %s\n",
745 battery
->rate_now
, acpi_battery_units(battery
));
747 if (battery
->capacity_now
== ACPI_BATTERY_VALUE_UNKNOWN
)
748 seq_printf(seq
, "remaining capacity: unknown\n");
750 seq_printf(seq
, "remaining capacity: %d %sh\n",
751 battery
->capacity_now
, acpi_battery_units(battery
));
752 if (battery
->voltage_now
== ACPI_BATTERY_VALUE_UNKNOWN
)
753 seq_printf(seq
, "present voltage: unknown\n");
755 seq_printf(seq
, "present voltage: %d mV\n",
756 battery
->voltage_now
);
759 seq_printf(seq
, "ERROR: Unable to read battery state\n");
764 static int acpi_battery_print_alarm(struct seq_file
*seq
, int result
)
766 struct acpi_battery
*battery
= seq
->private;
771 if (!acpi_battery_present(battery
)) {
772 seq_printf(seq
, "present: no\n");
775 seq_printf(seq
, "alarm: ");
777 seq_printf(seq
, "unsupported\n");
779 seq_printf(seq
, "%u %sh\n", battery
->alarm
,
780 acpi_battery_units(battery
));
783 seq_printf(seq
, "ERROR: Unable to read battery alarm\n");
787 static ssize_t
acpi_battery_write_alarm(struct file
*file
,
788 const char __user
* buffer
,
789 size_t count
, loff_t
* ppos
)
792 char alarm_string
[12] = { '\0' };
793 struct seq_file
*m
= file
->private_data
;
794 struct acpi_battery
*battery
= m
->private;
796 if (!battery
|| (count
> sizeof(alarm_string
) - 1))
798 if (!acpi_battery_present(battery
)) {
802 if (copy_from_user(alarm_string
, buffer
, count
)) {
806 alarm_string
[count
] = '\0';
807 battery
->alarm
= simple_strtol(alarm_string
, NULL
, 0);
808 result
= acpi_battery_set_alarm(battery
);
815 typedef int(*print_func
)(struct seq_file
*seq
, int result
);
817 static print_func acpi_print_funcs
[ACPI_BATTERY_NUMFILES
] = {
818 acpi_battery_print_info
,
819 acpi_battery_print_state
,
820 acpi_battery_print_alarm
,
823 static int acpi_battery_read(int fid
, struct seq_file
*seq
)
825 struct acpi_battery
*battery
= seq
->private;
826 int result
= acpi_battery_update(battery
);
827 return acpi_print_funcs
[fid
](seq
, result
);
830 #define DECLARE_FILE_FUNCTIONS(_name) \
831 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
833 return acpi_battery_read(_name##_tag, seq); \
835 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
837 return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
840 DECLARE_FILE_FUNCTIONS(info
);
841 DECLARE_FILE_FUNCTIONS(state
);
842 DECLARE_FILE_FUNCTIONS(alarm
);
844 #undef DECLARE_FILE_FUNCTIONS
846 #define FILE_DESCRIPTION_RO(_name) \
848 .name = __stringify(_name), \
851 .open = acpi_battery_##_name##_open_fs, \
853 .llseek = seq_lseek, \
854 .release = single_release, \
855 .owner = THIS_MODULE, \
859 #define FILE_DESCRIPTION_RW(_name) \
861 .name = __stringify(_name), \
862 .mode = S_IFREG | S_IRUGO | S_IWUSR, \
864 .open = acpi_battery_##_name##_open_fs, \
866 .llseek = seq_lseek, \
867 .write = acpi_battery_write_##_name, \
868 .release = single_release, \
869 .owner = THIS_MODULE, \
873 static const struct battery_file
{
874 struct file_operations ops
;
877 } acpi_battery_file
[] = {
878 FILE_DESCRIPTION_RO(info
),
879 FILE_DESCRIPTION_RO(state
),
880 FILE_DESCRIPTION_RW(alarm
),
883 #undef FILE_DESCRIPTION_RO
884 #undef FILE_DESCRIPTION_RW
886 static int acpi_battery_add_fs(struct acpi_device
*device
)
888 struct proc_dir_entry
*entry
= NULL
;
891 printk(KERN_WARNING PREFIX
"Deprecated procfs I/F for battery is loaded,"
892 " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
893 if (!acpi_device_dir(device
)) {
894 acpi_device_dir(device
) = proc_mkdir(acpi_device_bid(device
),
896 if (!acpi_device_dir(device
))
900 for (i
= 0; i
< ACPI_BATTERY_NUMFILES
; ++i
) {
901 entry
= proc_create_data(acpi_battery_file
[i
].name
,
902 acpi_battery_file
[i
].mode
,
903 acpi_device_dir(device
),
904 &acpi_battery_file
[i
].ops
,
905 acpi_driver_data(device
));
912 static void acpi_battery_remove_fs(struct acpi_device
*device
)
915 if (!acpi_device_dir(device
))
917 for (i
= 0; i
< ACPI_BATTERY_NUMFILES
; ++i
)
918 remove_proc_entry(acpi_battery_file
[i
].name
,
919 acpi_device_dir(device
));
921 remove_proc_entry(acpi_device_bid(device
), acpi_battery_dir
);
922 acpi_device_dir(device
) = NULL
;
927 /* --------------------------------------------------------------------------
929 -------------------------------------------------------------------------- */
931 static void acpi_battery_notify(struct acpi_device
*device
, u32 event
)
933 struct acpi_battery
*battery
= acpi_driver_data(device
);
938 old
= battery
->bat
.dev
;
939 if (event
== ACPI_BATTERY_NOTIFY_INFO
)
940 acpi_battery_refresh(battery
);
941 acpi_battery_update(battery
);
942 acpi_bus_generate_proc_event(device
, event
,
943 acpi_battery_present(battery
));
944 acpi_bus_generate_netlink_event(device
->pnp
.device_class
,
945 dev_name(&device
->dev
), event
,
946 acpi_battery_present(battery
));
947 /* acpi_battery_update could remove power_supply object */
948 if (old
&& battery
->bat
.dev
)
949 power_supply_changed(&battery
->bat
);
952 static int battery_notify(struct notifier_block
*nb
,
953 unsigned long mode
, void *_unused
)
955 struct acpi_battery
*battery
= container_of(nb
, struct acpi_battery
,
958 case PM_POST_HIBERNATION
:
959 case PM_POST_SUSPEND
:
960 if (battery
->bat
.dev
) {
961 sysfs_remove_battery(battery
);
962 sysfs_add_battery(battery
);
970 static int acpi_battery_add(struct acpi_device
*device
)
973 struct acpi_battery
*battery
= NULL
;
977 battery
= kzalloc(sizeof(struct acpi_battery
), GFP_KERNEL
);
980 battery
->device
= device
;
981 strcpy(acpi_device_name(device
), ACPI_BATTERY_DEVICE_NAME
);
982 strcpy(acpi_device_class(device
), ACPI_BATTERY_CLASS
);
983 device
->driver_data
= battery
;
984 mutex_init(&battery
->lock
);
985 if (ACPI_SUCCESS(acpi_get_handle(battery
->device
->handle
,
987 set_bit(ACPI_BATTERY_XINFO_PRESENT
, &battery
->flags
);
988 result
= acpi_battery_update(battery
);
991 #ifdef CONFIG_ACPI_PROCFS_POWER
992 result
= acpi_battery_add_fs(device
);
995 #ifdef CONFIG_ACPI_PROCFS_POWER
996 acpi_battery_remove_fs(device
);
1001 printk(KERN_INFO PREFIX
"%s Slot [%s] (battery %s)\n",
1002 ACPI_BATTERY_DEVICE_NAME
, acpi_device_bid(device
),
1003 device
->status
.battery_present
? "present" : "absent");
1005 battery
->pm_nb
.notifier_call
= battery_notify
;
1006 register_pm_notifier(&battery
->pm_nb
);
1011 sysfs_remove_battery(battery
);
1012 mutex_destroy(&battery
->lock
);
1017 static int acpi_battery_remove(struct acpi_device
*device
, int type
)
1019 struct acpi_battery
*battery
= NULL
;
1021 if (!device
|| !acpi_driver_data(device
))
1023 battery
= acpi_driver_data(device
);
1024 unregister_pm_notifier(&battery
->pm_nb
);
1025 #ifdef CONFIG_ACPI_PROCFS_POWER
1026 acpi_battery_remove_fs(device
);
1028 sysfs_remove_battery(battery
);
1029 mutex_destroy(&battery
->lock
);
1034 /* this is needed to learn about changes made in suspended state */
1035 static int acpi_battery_resume(struct acpi_device
*device
)
1037 struct acpi_battery
*battery
;
1040 battery
= acpi_driver_data(device
);
1041 battery
->update_time
= 0;
1042 acpi_battery_update(battery
);
1046 static struct acpi_driver acpi_battery_driver
= {
1048 .class = ACPI_BATTERY_CLASS
,
1049 .ids
= battery_device_ids
,
1050 .flags
= ACPI_DRIVER_ALL_NOTIFY_EVENTS
,
1052 .add
= acpi_battery_add
,
1053 .resume
= acpi_battery_resume
,
1054 .remove
= acpi_battery_remove
,
1055 .notify
= acpi_battery_notify
,
1059 static void __init
acpi_battery_init_async(void *unused
, async_cookie_t cookie
)
1063 #ifdef CONFIG_ACPI_PROCFS_POWER
1064 acpi_battery_dir
= acpi_lock_battery_dir();
1065 if (!acpi_battery_dir
)
1068 if (acpi_bus_register_driver(&acpi_battery_driver
) < 0) {
1069 #ifdef CONFIG_ACPI_PROCFS_POWER
1070 acpi_unlock_battery_dir(acpi_battery_dir
);
1077 static int __init
acpi_battery_init(void)
1079 async_schedule(acpi_battery_init_async
, NULL
);
1083 static void __exit
acpi_battery_exit(void)
1085 acpi_bus_unregister_driver(&acpi_battery_driver
);
1086 #ifdef CONFIG_ACPI_PROCFS_POWER
1087 acpi_unlock_battery_dir(acpi_battery_dir
);
1091 module_init(acpi_battery_init
);
1092 module_exit(acpi_battery_exit
);