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/delay.h>
36 #include <linux/slab.h>
37 #include <linux/suspend.h>
38 #include <linux/delay.h>
39 #include <asm/unaligned.h>
41 #ifdef CONFIG_ACPI_PROCFS_POWER
42 #include <linux/proc_fs.h>
43 #include <linux/seq_file.h>
44 #include <asm/uaccess.h>
47 #include <linux/acpi.h>
48 #include <linux/power_supply.h>
52 #define PREFIX "ACPI: "
54 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
56 #define ACPI_BATTERY_DEVICE_NAME "Battery"
58 /* Battery power unit: 0 means mW, 1 means mA */
59 #define ACPI_BATTERY_POWER_UNIT_MA 1
61 #define ACPI_BATTERY_STATE_DISCHARGING 0x1
62 #define ACPI_BATTERY_STATE_CHARGING 0x2
63 #define ACPI_BATTERY_STATE_CRITICAL 0x4
65 #define _COMPONENT ACPI_BATTERY_COMPONENT
67 ACPI_MODULE_NAME("battery");
69 MODULE_AUTHOR("Paul Diefenbaugh");
70 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
71 MODULE_DESCRIPTION("ACPI Battery Driver");
72 MODULE_LICENSE("GPL");
74 static int battery_bix_broken_package
;
75 static int battery_notification_delay_ms
;
76 static unsigned int cache_time
= 1000;
77 module_param(cache_time
, uint
, 0644);
78 MODULE_PARM_DESC(cache_time
, "cache time in milliseconds");
80 #ifdef CONFIG_ACPI_PROCFS_POWER
81 extern struct proc_dir_entry
*acpi_lock_battery_dir(void);
82 extern void *acpi_unlock_battery_dir(struct proc_dir_entry
*acpi_battery_dir
);
84 enum acpi_battery_files
{
88 ACPI_BATTERY_NUMFILES
,
93 static const struct acpi_device_id battery_device_ids
[] = {
98 MODULE_DEVICE_TABLE(acpi
, battery_device_ids
);
101 ACPI_BATTERY_ALARM_PRESENT
,
102 ACPI_BATTERY_XINFO_PRESENT
,
103 ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY
,
104 /* On Lenovo Thinkpad models from 2010 and 2011, the power unit
105 switches between mWh and mAh depending on whether the system
106 is running on battery or not. When mAh is the unit, most
107 reported values are incorrect and need to be adjusted by
108 10000/design_voltage. Verified on x201, t410, t410s, and x220.
109 Pre-2010 and 2012 models appear to always report in mWh and
110 are thus unaffected (tested with t42, t61, t500, x200, x300,
111 and x230). Also, in mid-2012 Lenovo issued a BIOS update for
112 the 2011 models that fixes the issue (tested on x220 with a
113 post-1.29 BIOS), but as of Nov. 2012, no such update is
114 available for the 2010 models. */
115 ACPI_BATTERY_QUIRK_THINKPAD_MAH
,
118 struct acpi_battery
{
120 struct mutex sysfs_lock
;
121 struct power_supply bat
;
122 struct acpi_device
*device
;
123 struct notifier_block pm_nb
;
124 unsigned long update_time
;
130 int full_charge_capacity
;
133 int design_capacity_warning
;
134 int design_capacity_low
;
136 int measurement_accuracy
;
137 int max_sampling_time
;
138 int min_sampling_time
;
139 int max_averaging_interval
;
140 int min_averaging_interval
;
141 int capacity_granularity_1
;
142 int capacity_granularity_2
;
144 char model_number
[32];
145 char serial_number
[32];
153 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat)
155 static inline int acpi_battery_present(struct acpi_battery
*battery
)
157 return battery
->device
->status
.battery_present
;
160 static int acpi_battery_technology(struct acpi_battery
*battery
)
162 if (!strcasecmp("NiCd", battery
->type
))
163 return POWER_SUPPLY_TECHNOLOGY_NiCd
;
164 if (!strcasecmp("NiMH", battery
->type
))
165 return POWER_SUPPLY_TECHNOLOGY_NiMH
;
166 if (!strcasecmp("LION", battery
->type
))
167 return POWER_SUPPLY_TECHNOLOGY_LION
;
168 if (!strncasecmp("LI-ION", battery
->type
, 6))
169 return POWER_SUPPLY_TECHNOLOGY_LION
;
170 if (!strcasecmp("LiP", battery
->type
))
171 return POWER_SUPPLY_TECHNOLOGY_LIPO
;
172 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN
;
175 static int acpi_battery_get_state(struct acpi_battery
*battery
);
177 static int acpi_battery_is_charged(struct acpi_battery
*battery
)
179 /* charging, discharging or critical low */
180 if (battery
->state
!= 0)
183 /* battery not reporting charge */
184 if (battery
->capacity_now
== ACPI_BATTERY_VALUE_UNKNOWN
||
185 battery
->capacity_now
== 0)
188 /* good batteries update full_charge as the batteries degrade */
189 if (battery
->full_charge_capacity
== battery
->capacity_now
)
192 /* fallback to using design values for broken batteries */
193 if (battery
->design_capacity
== battery
->capacity_now
)
196 /* we don't do any sort of metric based on percentages */
200 static int acpi_battery_get_property(struct power_supply
*psy
,
201 enum power_supply_property psp
,
202 union power_supply_propval
*val
)
205 struct acpi_battery
*battery
= to_acpi_battery(psy
);
207 if (acpi_battery_present(battery
)) {
208 /* run battery update only if it is present */
209 acpi_battery_get_state(battery
);
210 } else if (psp
!= POWER_SUPPLY_PROP_PRESENT
)
213 case POWER_SUPPLY_PROP_STATUS
:
214 if (battery
->state
& ACPI_BATTERY_STATE_DISCHARGING
)
215 val
->intval
= POWER_SUPPLY_STATUS_DISCHARGING
;
216 else if (battery
->state
& ACPI_BATTERY_STATE_CHARGING
)
217 val
->intval
= POWER_SUPPLY_STATUS_CHARGING
;
218 else if (acpi_battery_is_charged(battery
))
219 val
->intval
= POWER_SUPPLY_STATUS_FULL
;
221 val
->intval
= POWER_SUPPLY_STATUS_UNKNOWN
;
223 case POWER_SUPPLY_PROP_PRESENT
:
224 val
->intval
= acpi_battery_present(battery
);
226 case POWER_SUPPLY_PROP_TECHNOLOGY
:
227 val
->intval
= acpi_battery_technology(battery
);
229 case POWER_SUPPLY_PROP_CYCLE_COUNT
:
230 val
->intval
= battery
->cycle_count
;
232 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN
:
233 if (battery
->design_voltage
== ACPI_BATTERY_VALUE_UNKNOWN
)
236 val
->intval
= battery
->design_voltage
* 1000;
238 case POWER_SUPPLY_PROP_VOLTAGE_NOW
:
239 if (battery
->voltage_now
== ACPI_BATTERY_VALUE_UNKNOWN
)
242 val
->intval
= battery
->voltage_now
* 1000;
244 case POWER_SUPPLY_PROP_CURRENT_NOW
:
245 case POWER_SUPPLY_PROP_POWER_NOW
:
246 if (battery
->rate_now
== ACPI_BATTERY_VALUE_UNKNOWN
)
249 val
->intval
= battery
->rate_now
* 1000;
251 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN
:
252 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN
:
253 if (battery
->design_capacity
== ACPI_BATTERY_VALUE_UNKNOWN
)
256 val
->intval
= battery
->design_capacity
* 1000;
258 case POWER_SUPPLY_PROP_CHARGE_FULL
:
259 case POWER_SUPPLY_PROP_ENERGY_FULL
:
260 if (battery
->full_charge_capacity
== ACPI_BATTERY_VALUE_UNKNOWN
)
263 val
->intval
= battery
->full_charge_capacity
* 1000;
265 case POWER_SUPPLY_PROP_CHARGE_NOW
:
266 case POWER_SUPPLY_PROP_ENERGY_NOW
:
267 if (battery
->capacity_now
== ACPI_BATTERY_VALUE_UNKNOWN
)
270 val
->intval
= battery
->capacity_now
* 1000;
272 case POWER_SUPPLY_PROP_CAPACITY
:
273 if (battery
->capacity_now
&& battery
->full_charge_capacity
)
274 val
->intval
= battery
->capacity_now
* 100/
275 battery
->full_charge_capacity
;
279 case POWER_SUPPLY_PROP_CAPACITY_LEVEL
:
280 if (battery
->state
& ACPI_BATTERY_STATE_CRITICAL
)
281 val
->intval
= POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL
;
282 else if (test_bit(ACPI_BATTERY_ALARM_PRESENT
, &battery
->flags
) &&
283 (battery
->capacity_now
<= battery
->alarm
))
284 val
->intval
= POWER_SUPPLY_CAPACITY_LEVEL_LOW
;
285 else if (acpi_battery_is_charged(battery
))
286 val
->intval
= POWER_SUPPLY_CAPACITY_LEVEL_FULL
;
288 val
->intval
= POWER_SUPPLY_CAPACITY_LEVEL_NORMAL
;
290 case POWER_SUPPLY_PROP_MODEL_NAME
:
291 val
->strval
= battery
->model_number
;
293 case POWER_SUPPLY_PROP_MANUFACTURER
:
294 val
->strval
= battery
->oem_info
;
296 case POWER_SUPPLY_PROP_SERIAL_NUMBER
:
297 val
->strval
= battery
->serial_number
;
305 static enum power_supply_property charge_battery_props
[] = {
306 POWER_SUPPLY_PROP_STATUS
,
307 POWER_SUPPLY_PROP_PRESENT
,
308 POWER_SUPPLY_PROP_TECHNOLOGY
,
309 POWER_SUPPLY_PROP_CYCLE_COUNT
,
310 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN
,
311 POWER_SUPPLY_PROP_VOLTAGE_NOW
,
312 POWER_SUPPLY_PROP_CURRENT_NOW
,
313 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN
,
314 POWER_SUPPLY_PROP_CHARGE_FULL
,
315 POWER_SUPPLY_PROP_CHARGE_NOW
,
316 POWER_SUPPLY_PROP_CAPACITY
,
317 POWER_SUPPLY_PROP_CAPACITY_LEVEL
,
318 POWER_SUPPLY_PROP_MODEL_NAME
,
319 POWER_SUPPLY_PROP_MANUFACTURER
,
320 POWER_SUPPLY_PROP_SERIAL_NUMBER
,
323 static enum power_supply_property energy_battery_props
[] = {
324 POWER_SUPPLY_PROP_STATUS
,
325 POWER_SUPPLY_PROP_PRESENT
,
326 POWER_SUPPLY_PROP_TECHNOLOGY
,
327 POWER_SUPPLY_PROP_CYCLE_COUNT
,
328 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN
,
329 POWER_SUPPLY_PROP_VOLTAGE_NOW
,
330 POWER_SUPPLY_PROP_POWER_NOW
,
331 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN
,
332 POWER_SUPPLY_PROP_ENERGY_FULL
,
333 POWER_SUPPLY_PROP_ENERGY_NOW
,
334 POWER_SUPPLY_PROP_CAPACITY
,
335 POWER_SUPPLY_PROP_CAPACITY_LEVEL
,
336 POWER_SUPPLY_PROP_MODEL_NAME
,
337 POWER_SUPPLY_PROP_MANUFACTURER
,
338 POWER_SUPPLY_PROP_SERIAL_NUMBER
,
341 #ifdef CONFIG_ACPI_PROCFS_POWER
342 inline char *acpi_battery_units(struct acpi_battery
*battery
)
344 return (battery
->power_unit
== ACPI_BATTERY_POWER_UNIT_MA
) ?
349 /* --------------------------------------------------------------------------
351 -------------------------------------------------------------------------- */
352 struct acpi_offsets
{
353 size_t offset
; /* offset inside struct acpi_sbs_battery */
354 u8 mode
; /* int or string? */
357 static struct acpi_offsets state_offsets
[] = {
358 {offsetof(struct acpi_battery
, state
), 0},
359 {offsetof(struct acpi_battery
, rate_now
), 0},
360 {offsetof(struct acpi_battery
, capacity_now
), 0},
361 {offsetof(struct acpi_battery
, voltage_now
), 0},
364 static struct acpi_offsets info_offsets
[] = {
365 {offsetof(struct acpi_battery
, power_unit
), 0},
366 {offsetof(struct acpi_battery
, design_capacity
), 0},
367 {offsetof(struct acpi_battery
, full_charge_capacity
), 0},
368 {offsetof(struct acpi_battery
, technology
), 0},
369 {offsetof(struct acpi_battery
, design_voltage
), 0},
370 {offsetof(struct acpi_battery
, design_capacity_warning
), 0},
371 {offsetof(struct acpi_battery
, design_capacity_low
), 0},
372 {offsetof(struct acpi_battery
, capacity_granularity_1
), 0},
373 {offsetof(struct acpi_battery
, capacity_granularity_2
), 0},
374 {offsetof(struct acpi_battery
, model_number
), 1},
375 {offsetof(struct acpi_battery
, serial_number
), 1},
376 {offsetof(struct acpi_battery
, type
), 1},
377 {offsetof(struct acpi_battery
, oem_info
), 1},
380 static struct acpi_offsets extended_info_offsets
[] = {
381 {offsetof(struct acpi_battery
, revision
), 0},
382 {offsetof(struct acpi_battery
, power_unit
), 0},
383 {offsetof(struct acpi_battery
, design_capacity
), 0},
384 {offsetof(struct acpi_battery
, full_charge_capacity
), 0},
385 {offsetof(struct acpi_battery
, technology
), 0},
386 {offsetof(struct acpi_battery
, design_voltage
), 0},
387 {offsetof(struct acpi_battery
, design_capacity_warning
), 0},
388 {offsetof(struct acpi_battery
, design_capacity_low
), 0},
389 {offsetof(struct acpi_battery
, cycle_count
), 0},
390 {offsetof(struct acpi_battery
, measurement_accuracy
), 0},
391 {offsetof(struct acpi_battery
, max_sampling_time
), 0},
392 {offsetof(struct acpi_battery
, min_sampling_time
), 0},
393 {offsetof(struct acpi_battery
, max_averaging_interval
), 0},
394 {offsetof(struct acpi_battery
, min_averaging_interval
), 0},
395 {offsetof(struct acpi_battery
, capacity_granularity_1
), 0},
396 {offsetof(struct acpi_battery
, capacity_granularity_2
), 0},
397 {offsetof(struct acpi_battery
, model_number
), 1},
398 {offsetof(struct acpi_battery
, serial_number
), 1},
399 {offsetof(struct acpi_battery
, type
), 1},
400 {offsetof(struct acpi_battery
, oem_info
), 1},
403 static int extract_package(struct acpi_battery
*battery
,
404 union acpi_object
*package
,
405 struct acpi_offsets
*offsets
, int num
)
408 union acpi_object
*element
;
409 if (package
->type
!= ACPI_TYPE_PACKAGE
)
411 for (i
= 0; i
< num
; ++i
) {
412 if (package
->package
.count
<= i
)
414 element
= &package
->package
.elements
[i
];
415 if (offsets
[i
].mode
) {
416 u8
*ptr
= (u8
*)battery
+ offsets
[i
].offset
;
417 if (element
->type
== ACPI_TYPE_STRING
||
418 element
->type
== ACPI_TYPE_BUFFER
)
419 strncpy(ptr
, element
->string
.pointer
, 32);
420 else if (element
->type
== ACPI_TYPE_INTEGER
) {
421 strncpy(ptr
, (u8
*)&element
->integer
.value
,
423 ptr
[sizeof(u64
)] = 0;
425 *ptr
= 0; /* don't have value */
427 int *x
= (int *)((u8
*)battery
+ offsets
[i
].offset
);
428 *x
= (element
->type
== ACPI_TYPE_INTEGER
) ?
429 element
->integer
.value
: -1;
435 static int acpi_battery_get_status(struct acpi_battery
*battery
)
437 if (acpi_bus_get_status(battery
->device
)) {
438 ACPI_EXCEPTION((AE_INFO
, AE_ERROR
, "Evaluating _STA"));
444 static int acpi_battery_get_info(struct acpi_battery
*battery
)
446 int result
= -EFAULT
;
447 acpi_status status
= 0;
448 char *name
= test_bit(ACPI_BATTERY_XINFO_PRESENT
, &battery
->flags
) ?
451 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
453 if (!acpi_battery_present(battery
))
455 mutex_lock(&battery
->lock
);
456 status
= acpi_evaluate_object(battery
->device
->handle
, name
,
458 mutex_unlock(&battery
->lock
);
460 if (ACPI_FAILURE(status
)) {
461 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating %s", name
));
465 if (battery_bix_broken_package
)
466 result
= extract_package(battery
, buffer
.pointer
,
467 extended_info_offsets
+ 1,
468 ARRAY_SIZE(extended_info_offsets
) - 1);
469 else if (test_bit(ACPI_BATTERY_XINFO_PRESENT
, &battery
->flags
))
470 result
= extract_package(battery
, buffer
.pointer
,
471 extended_info_offsets
,
472 ARRAY_SIZE(extended_info_offsets
));
474 result
= extract_package(battery
, buffer
.pointer
,
475 info_offsets
, ARRAY_SIZE(info_offsets
));
476 kfree(buffer
.pointer
);
477 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY
, &battery
->flags
))
478 battery
->full_charge_capacity
= battery
->design_capacity
;
479 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH
, &battery
->flags
) &&
480 battery
->power_unit
&& battery
->design_voltage
) {
481 battery
->design_capacity
= battery
->design_capacity
*
482 10000 / battery
->design_voltage
;
483 battery
->full_charge_capacity
= battery
->full_charge_capacity
*
484 10000 / battery
->design_voltage
;
485 battery
->design_capacity_warning
=
486 battery
->design_capacity_warning
*
487 10000 / battery
->design_voltage
;
488 /* Curiously, design_capacity_low, unlike the rest of them,
490 /* capacity_granularity_* equal 1 on the systems tested, so
491 it's impossible to tell if they would need an adjustment
492 or not if their values were higher. */
497 static int acpi_battery_get_state(struct acpi_battery
*battery
)
500 acpi_status status
= 0;
501 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
503 if (!acpi_battery_present(battery
))
506 if (battery
->update_time
&&
507 time_before(jiffies
, battery
->update_time
+
508 msecs_to_jiffies(cache_time
)))
511 mutex_lock(&battery
->lock
);
512 status
= acpi_evaluate_object(battery
->device
->handle
, "_BST",
514 mutex_unlock(&battery
->lock
);
516 if (ACPI_FAILURE(status
)) {
517 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _BST"));
521 result
= extract_package(battery
, buffer
.pointer
,
522 state_offsets
, ARRAY_SIZE(state_offsets
));
523 battery
->update_time
= jiffies
;
524 kfree(buffer
.pointer
);
526 /* For buggy DSDTs that report negative 16-bit values for either
527 * charging or discharging current and/or report 0 as 65536
530 if (battery
->power_unit
== ACPI_BATTERY_POWER_UNIT_MA
&&
531 battery
->rate_now
!= ACPI_BATTERY_VALUE_UNKNOWN
&&
532 (s16
)(battery
->rate_now
) < 0) {
533 battery
->rate_now
= abs((s16
)battery
->rate_now
);
534 printk_once(KERN_WARNING FW_BUG
"battery: (dis)charge rate"
538 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY
, &battery
->flags
)
539 && battery
->capacity_now
>= 0 && battery
->capacity_now
<= 100)
540 battery
->capacity_now
= (battery
->capacity_now
*
541 battery
->full_charge_capacity
) / 100;
542 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH
, &battery
->flags
) &&
543 battery
->power_unit
&& battery
->design_voltage
) {
544 battery
->capacity_now
= battery
->capacity_now
*
545 10000 / battery
->design_voltage
;
550 static int acpi_battery_set_alarm(struct acpi_battery
*battery
)
552 acpi_status status
= 0;
554 if (!acpi_battery_present(battery
) ||
555 !test_bit(ACPI_BATTERY_ALARM_PRESENT
, &battery
->flags
))
558 mutex_lock(&battery
->lock
);
559 status
= acpi_execute_simple_method(battery
->device
->handle
, "_BTP",
561 mutex_unlock(&battery
->lock
);
563 if (ACPI_FAILURE(status
))
566 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Alarm set to %d\n", battery
->alarm
));
570 static int acpi_battery_init_alarm(struct acpi_battery
*battery
)
572 /* See if alarms are supported, and if so, set default */
573 if (!acpi_has_method(battery
->device
->handle
, "_BTP")) {
574 clear_bit(ACPI_BATTERY_ALARM_PRESENT
, &battery
->flags
);
577 set_bit(ACPI_BATTERY_ALARM_PRESENT
, &battery
->flags
);
579 battery
->alarm
= battery
->design_capacity_warning
;
580 return acpi_battery_set_alarm(battery
);
583 static ssize_t
acpi_battery_alarm_show(struct device
*dev
,
584 struct device_attribute
*attr
,
587 struct acpi_battery
*battery
= to_acpi_battery(dev_get_drvdata(dev
));
588 return sprintf(buf
, "%d\n", battery
->alarm
* 1000);
591 static ssize_t
acpi_battery_alarm_store(struct device
*dev
,
592 struct device_attribute
*attr
,
593 const char *buf
, size_t count
)
596 struct acpi_battery
*battery
= to_acpi_battery(dev_get_drvdata(dev
));
597 if (sscanf(buf
, "%lu\n", &x
) == 1)
598 battery
->alarm
= x
/1000;
599 if (acpi_battery_present(battery
))
600 acpi_battery_set_alarm(battery
);
604 static struct device_attribute alarm_attr
= {
605 .attr
= {.name
= "alarm", .mode
= 0644},
606 .show
= acpi_battery_alarm_show
,
607 .store
= acpi_battery_alarm_store
,
610 static int sysfs_add_battery(struct acpi_battery
*battery
)
614 if (battery
->power_unit
== ACPI_BATTERY_POWER_UNIT_MA
) {
615 battery
->bat
.properties
= charge_battery_props
;
616 battery
->bat
.num_properties
=
617 ARRAY_SIZE(charge_battery_props
);
619 battery
->bat
.properties
= energy_battery_props
;
620 battery
->bat
.num_properties
=
621 ARRAY_SIZE(energy_battery_props
);
624 battery
->bat
.name
= acpi_device_bid(battery
->device
);
625 battery
->bat
.type
= POWER_SUPPLY_TYPE_BATTERY
;
626 battery
->bat
.get_property
= acpi_battery_get_property
;
628 result
= power_supply_register_no_ws(&battery
->device
->dev
, &battery
->bat
);
632 return device_create_file(battery
->bat
.dev
, &alarm_attr
);
635 static void sysfs_remove_battery(struct acpi_battery
*battery
)
637 mutex_lock(&battery
->sysfs_lock
);
638 if (!battery
->bat
.dev
) {
639 mutex_unlock(&battery
->sysfs_lock
);
643 device_remove_file(battery
->bat
.dev
, &alarm_attr
);
644 power_supply_unregister(&battery
->bat
);
645 battery
->bat
.dev
= NULL
;
646 mutex_unlock(&battery
->sysfs_lock
);
649 static void find_battery(const struct dmi_header
*dm
, void *private)
651 struct acpi_battery
*battery
= (struct acpi_battery
*)private;
652 /* Note: the hardcoded offsets below have been extracted from
653 the source code of dmidecode. */
654 if (dm
->type
== DMI_ENTRY_PORTABLE_BATTERY
&& dm
->length
>= 8) {
655 const u8
*dmi_data
= (const u8
*)(dm
+ 1);
656 int dmi_capacity
= get_unaligned((const u16
*)(dmi_data
+ 6));
657 if (dm
->length
>= 18)
658 dmi_capacity
*= dmi_data
[17];
659 if (battery
->design_capacity
* battery
->design_voltage
/ 1000
661 battery
->design_capacity
* 10 == dmi_capacity
)
662 set_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH
,
668 * According to the ACPI spec, some kinds of primary batteries can
669 * report percentage battery remaining capacity directly to OS.
670 * In this case, it reports the Last Full Charged Capacity == 100
671 * and BatteryPresentRate == 0xFFFFFFFF.
673 * Now we found some battery reports percentage remaining capacity
674 * even if it's rechargeable.
675 * https://bugzilla.kernel.org/show_bug.cgi?id=15979
677 * Handle this correctly so that they won't break userspace.
679 static void acpi_battery_quirks(struct acpi_battery
*battery
)
681 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY
, &battery
->flags
))
684 if (battery
->full_charge_capacity
== 100 &&
685 battery
->rate_now
== ACPI_BATTERY_VALUE_UNKNOWN
&&
686 battery
->capacity_now
>= 0 && battery
->capacity_now
<= 100) {
687 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY
, &battery
->flags
);
688 battery
->full_charge_capacity
= battery
->design_capacity
;
689 battery
->capacity_now
= (battery
->capacity_now
*
690 battery
->full_charge_capacity
) / 100;
693 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH
, &battery
->flags
))
696 if (battery
->power_unit
&& dmi_name_in_vendors("LENOVO")) {
698 s
= dmi_get_system_info(DMI_PRODUCT_VERSION
);
699 if (s
&& !strnicmp(s
, "ThinkPad", 8)) {
700 dmi_walk(find_battery
, battery
);
701 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH
,
703 battery
->design_voltage
) {
704 battery
->design_capacity
=
705 battery
->design_capacity
*
706 10000 / battery
->design_voltage
;
707 battery
->full_charge_capacity
=
708 battery
->full_charge_capacity
*
709 10000 / battery
->design_voltage
;
710 battery
->design_capacity_warning
=
711 battery
->design_capacity_warning
*
712 10000 / battery
->design_voltage
;
713 battery
->capacity_now
= battery
->capacity_now
*
714 10000 / battery
->design_voltage
;
720 static int acpi_battery_update(struct acpi_battery
*battery
, bool resume
)
722 int result
, old_present
= acpi_battery_present(battery
);
723 result
= acpi_battery_get_status(battery
);
726 if (!acpi_battery_present(battery
)) {
727 sysfs_remove_battery(battery
);
728 battery
->update_time
= 0;
735 if (!battery
->update_time
||
736 old_present
!= acpi_battery_present(battery
)) {
737 result
= acpi_battery_get_info(battery
);
740 acpi_battery_init_alarm(battery
);
742 if (!battery
->bat
.dev
) {
743 result
= sysfs_add_battery(battery
);
747 result
= acpi_battery_get_state(battery
);
750 acpi_battery_quirks(battery
);
753 * Wakeup the system if battery is critical low
754 * or lower than the alarm level
756 if ((battery
->state
& ACPI_BATTERY_STATE_CRITICAL
) ||
757 (test_bit(ACPI_BATTERY_ALARM_PRESENT
, &battery
->flags
) &&
758 (battery
->capacity_now
<= battery
->alarm
)))
759 pm_wakeup_event(&battery
->device
->dev
, 0);
764 static void acpi_battery_refresh(struct acpi_battery
*battery
)
768 if (!battery
->bat
.dev
)
771 power_unit
= battery
->power_unit
;
773 acpi_battery_get_info(battery
);
775 if (power_unit
== battery
->power_unit
)
778 /* The battery has changed its reporting units. */
779 sysfs_remove_battery(battery
);
780 sysfs_add_battery(battery
);
783 /* --------------------------------------------------------------------------
785 -------------------------------------------------------------------------- */
787 #ifdef CONFIG_ACPI_PROCFS_POWER
788 static struct proc_dir_entry
*acpi_battery_dir
;
790 static int acpi_battery_print_info(struct seq_file
*seq
, int result
)
792 struct acpi_battery
*battery
= seq
->private;
797 seq_printf(seq
, "present: %s\n",
798 acpi_battery_present(battery
) ? "yes" : "no");
799 if (!acpi_battery_present(battery
))
801 if (battery
->design_capacity
== ACPI_BATTERY_VALUE_UNKNOWN
)
802 seq_printf(seq
, "design capacity: unknown\n");
804 seq_printf(seq
, "design capacity: %d %sh\n",
805 battery
->design_capacity
,
806 acpi_battery_units(battery
));
808 if (battery
->full_charge_capacity
== ACPI_BATTERY_VALUE_UNKNOWN
)
809 seq_printf(seq
, "last full capacity: unknown\n");
811 seq_printf(seq
, "last full capacity: %d %sh\n",
812 battery
->full_charge_capacity
,
813 acpi_battery_units(battery
));
815 seq_printf(seq
, "battery technology: %srechargeable\n",
816 (!battery
->technology
)?"non-":"");
818 if (battery
->design_voltage
== ACPI_BATTERY_VALUE_UNKNOWN
)
819 seq_printf(seq
, "design voltage: unknown\n");
821 seq_printf(seq
, "design voltage: %d mV\n",
822 battery
->design_voltage
);
823 seq_printf(seq
, "design capacity warning: %d %sh\n",
824 battery
->design_capacity_warning
,
825 acpi_battery_units(battery
));
826 seq_printf(seq
, "design capacity low: %d %sh\n",
827 battery
->design_capacity_low
,
828 acpi_battery_units(battery
));
829 seq_printf(seq
, "cycle count: %i\n", battery
->cycle_count
);
830 seq_printf(seq
, "capacity granularity 1: %d %sh\n",
831 battery
->capacity_granularity_1
,
832 acpi_battery_units(battery
));
833 seq_printf(seq
, "capacity granularity 2: %d %sh\n",
834 battery
->capacity_granularity_2
,
835 acpi_battery_units(battery
));
836 seq_printf(seq
, "model number: %s\n", battery
->model_number
);
837 seq_printf(seq
, "serial number: %s\n", battery
->serial_number
);
838 seq_printf(seq
, "battery type: %s\n", battery
->type
);
839 seq_printf(seq
, "OEM info: %s\n", battery
->oem_info
);
842 seq_printf(seq
, "ERROR: Unable to read battery info\n");
846 static int acpi_battery_print_state(struct seq_file
*seq
, int result
)
848 struct acpi_battery
*battery
= seq
->private;
853 seq_printf(seq
, "present: %s\n",
854 acpi_battery_present(battery
) ? "yes" : "no");
855 if (!acpi_battery_present(battery
))
858 seq_printf(seq
, "capacity state: %s\n",
859 (battery
->state
& 0x04) ? "critical" : "ok");
860 if ((battery
->state
& 0x01) && (battery
->state
& 0x02))
862 "charging state: charging/discharging\n");
863 else if (battery
->state
& 0x01)
864 seq_printf(seq
, "charging state: discharging\n");
865 else if (battery
->state
& 0x02)
866 seq_printf(seq
, "charging state: charging\n");
868 seq_printf(seq
, "charging state: charged\n");
870 if (battery
->rate_now
== ACPI_BATTERY_VALUE_UNKNOWN
)
871 seq_printf(seq
, "present rate: unknown\n");
873 seq_printf(seq
, "present rate: %d %s\n",
874 battery
->rate_now
, acpi_battery_units(battery
));
876 if (battery
->capacity_now
== ACPI_BATTERY_VALUE_UNKNOWN
)
877 seq_printf(seq
, "remaining capacity: unknown\n");
879 seq_printf(seq
, "remaining capacity: %d %sh\n",
880 battery
->capacity_now
, acpi_battery_units(battery
));
881 if (battery
->voltage_now
== ACPI_BATTERY_VALUE_UNKNOWN
)
882 seq_printf(seq
, "present voltage: unknown\n");
884 seq_printf(seq
, "present voltage: %d mV\n",
885 battery
->voltage_now
);
888 seq_printf(seq
, "ERROR: Unable to read battery state\n");
893 static int acpi_battery_print_alarm(struct seq_file
*seq
, int result
)
895 struct acpi_battery
*battery
= seq
->private;
900 if (!acpi_battery_present(battery
)) {
901 seq_printf(seq
, "present: no\n");
904 seq_printf(seq
, "alarm: ");
906 seq_printf(seq
, "unsupported\n");
908 seq_printf(seq
, "%u %sh\n", battery
->alarm
,
909 acpi_battery_units(battery
));
912 seq_printf(seq
, "ERROR: Unable to read battery alarm\n");
916 static ssize_t
acpi_battery_write_alarm(struct file
*file
,
917 const char __user
* buffer
,
918 size_t count
, loff_t
* ppos
)
921 char alarm_string
[12] = { '\0' };
922 struct seq_file
*m
= file
->private_data
;
923 struct acpi_battery
*battery
= m
->private;
925 if (!battery
|| (count
> sizeof(alarm_string
) - 1))
927 if (!acpi_battery_present(battery
)) {
931 if (copy_from_user(alarm_string
, buffer
, count
)) {
935 alarm_string
[count
] = '\0';
936 if (kstrtoint(alarm_string
, 0, &battery
->alarm
)) {
940 result
= acpi_battery_set_alarm(battery
);
947 typedef int(*print_func
)(struct seq_file
*seq
, int result
);
949 static print_func acpi_print_funcs
[ACPI_BATTERY_NUMFILES
] = {
950 acpi_battery_print_info
,
951 acpi_battery_print_state
,
952 acpi_battery_print_alarm
,
955 static int acpi_battery_read(int fid
, struct seq_file
*seq
)
957 struct acpi_battery
*battery
= seq
->private;
958 int result
= acpi_battery_update(battery
, false);
959 return acpi_print_funcs
[fid
](seq
, result
);
962 #define DECLARE_FILE_FUNCTIONS(_name) \
963 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
965 return acpi_battery_read(_name##_tag, seq); \
967 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
969 return single_open(file, acpi_battery_read_##_name, PDE_DATA(inode)); \
972 DECLARE_FILE_FUNCTIONS(info
);
973 DECLARE_FILE_FUNCTIONS(state
);
974 DECLARE_FILE_FUNCTIONS(alarm
);
976 #undef DECLARE_FILE_FUNCTIONS
978 #define FILE_DESCRIPTION_RO(_name) \
980 .name = __stringify(_name), \
983 .open = acpi_battery_##_name##_open_fs, \
985 .llseek = seq_lseek, \
986 .release = single_release, \
987 .owner = THIS_MODULE, \
991 #define FILE_DESCRIPTION_RW(_name) \
993 .name = __stringify(_name), \
994 .mode = S_IFREG | S_IRUGO | S_IWUSR, \
996 .open = acpi_battery_##_name##_open_fs, \
998 .llseek = seq_lseek, \
999 .write = acpi_battery_write_##_name, \
1000 .release = single_release, \
1001 .owner = THIS_MODULE, \
1005 static const struct battery_file
{
1006 struct file_operations ops
;
1009 } acpi_battery_file
[] = {
1010 FILE_DESCRIPTION_RO(info
),
1011 FILE_DESCRIPTION_RO(state
),
1012 FILE_DESCRIPTION_RW(alarm
),
1015 #undef FILE_DESCRIPTION_RO
1016 #undef FILE_DESCRIPTION_RW
1018 static int acpi_battery_add_fs(struct acpi_device
*device
)
1020 struct proc_dir_entry
*entry
= NULL
;
1023 printk(KERN_WARNING PREFIX
"Deprecated procfs I/F for battery is loaded,"
1024 " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
1025 if (!acpi_device_dir(device
)) {
1026 acpi_device_dir(device
) = proc_mkdir(acpi_device_bid(device
),
1028 if (!acpi_device_dir(device
))
1032 for (i
= 0; i
< ACPI_BATTERY_NUMFILES
; ++i
) {
1033 entry
= proc_create_data(acpi_battery_file
[i
].name
,
1034 acpi_battery_file
[i
].mode
,
1035 acpi_device_dir(device
),
1036 &acpi_battery_file
[i
].ops
,
1037 acpi_driver_data(device
));
1044 static void acpi_battery_remove_fs(struct acpi_device
*device
)
1047 if (!acpi_device_dir(device
))
1049 for (i
= 0; i
< ACPI_BATTERY_NUMFILES
; ++i
)
1050 remove_proc_entry(acpi_battery_file
[i
].name
,
1051 acpi_device_dir(device
));
1053 remove_proc_entry(acpi_device_bid(device
), acpi_battery_dir
);
1054 acpi_device_dir(device
) = NULL
;
1059 /* --------------------------------------------------------------------------
1061 -------------------------------------------------------------------------- */
1063 static void acpi_battery_notify(struct acpi_device
*device
, u32 event
)
1065 struct acpi_battery
*battery
= acpi_driver_data(device
);
1070 old
= battery
->bat
.dev
;
1072 * On Acer Aspire V5-573G notifications are sometimes triggered too
1073 * early. For example, when AC is unplugged and notification is
1074 * triggered, battery state is still reported as "Full", and changes to
1075 * "Discharging" only after short delay, without any notification.
1077 if (battery_notification_delay_ms
> 0)
1078 msleep(battery_notification_delay_ms
);
1079 if (event
== ACPI_BATTERY_NOTIFY_INFO
)
1080 acpi_battery_refresh(battery
);
1081 acpi_battery_update(battery
, false);
1082 acpi_bus_generate_netlink_event(device
->pnp
.device_class
,
1083 dev_name(&device
->dev
), event
,
1084 acpi_battery_present(battery
));
1085 acpi_notifier_call_chain(device
, event
, acpi_battery_present(battery
));
1086 /* acpi_battery_update could remove power_supply object */
1087 if (old
&& battery
->bat
.dev
)
1088 power_supply_changed(&battery
->bat
);
1091 static int battery_notify(struct notifier_block
*nb
,
1092 unsigned long mode
, void *_unused
)
1094 struct acpi_battery
*battery
= container_of(nb
, struct acpi_battery
,
1099 case PM_POST_HIBERNATION
:
1100 case PM_POST_SUSPEND
:
1101 if (!acpi_battery_present(battery
))
1104 if (!battery
->bat
.dev
) {
1105 result
= acpi_battery_get_info(battery
);
1109 result
= sysfs_add_battery(battery
);
1113 acpi_battery_refresh(battery
);
1115 acpi_battery_init_alarm(battery
);
1116 acpi_battery_get_state(battery
);
1123 static int battery_bix_broken_package_quirk(const struct dmi_system_id
*d
)
1125 battery_bix_broken_package
= 1;
1129 static int battery_notification_delay_quirk(const struct dmi_system_id
*d
)
1131 battery_notification_delay_ms
= 1000;
1135 static struct dmi_system_id bat_dmi_table
[] = {
1137 .callback
= battery_bix_broken_package_quirk
,
1138 .ident
= "NEC LZ750/LS",
1140 DMI_MATCH(DMI_SYS_VENDOR
, "NEC"),
1141 DMI_MATCH(DMI_PRODUCT_NAME
, "PC-LZ750LS"),
1145 .callback
= battery_notification_delay_quirk
,
1146 .ident
= "Acer Aspire V5-573G",
1148 DMI_MATCH(DMI_SYS_VENDOR
, "Acer"),
1149 DMI_MATCH(DMI_PRODUCT_NAME
, "Aspire V5-573G"),
1156 * Some machines'(E,G Lenovo Z480) ECs are not stable
1157 * during boot up and this causes battery driver fails to be
1158 * probed due to failure of getting battery information
1159 * from EC sometimes. After several retries, the operation
1160 * may work. So add retry code here and 20ms sleep between
1163 static int acpi_battery_update_retry(struct acpi_battery
*battery
)
1167 for (retry
= 5; retry
; retry
--) {
1168 ret
= acpi_battery_update(battery
, false);
1177 static int acpi_battery_add(struct acpi_device
*device
)
1180 struct acpi_battery
*battery
= NULL
;
1184 battery
= kzalloc(sizeof(struct acpi_battery
), GFP_KERNEL
);
1187 battery
->device
= device
;
1188 strcpy(acpi_device_name(device
), ACPI_BATTERY_DEVICE_NAME
);
1189 strcpy(acpi_device_class(device
), ACPI_BATTERY_CLASS
);
1190 device
->driver_data
= battery
;
1191 mutex_init(&battery
->lock
);
1192 mutex_init(&battery
->sysfs_lock
);
1193 if (acpi_has_method(battery
->device
->handle
, "_BIX"))
1194 set_bit(ACPI_BATTERY_XINFO_PRESENT
, &battery
->flags
);
1196 result
= acpi_battery_update_retry(battery
);
1200 #ifdef CONFIG_ACPI_PROCFS_POWER
1201 result
= acpi_battery_add_fs(device
);
1204 #ifdef CONFIG_ACPI_PROCFS_POWER
1205 acpi_battery_remove_fs(device
);
1210 printk(KERN_INFO PREFIX
"%s Slot [%s] (battery %s)\n",
1211 ACPI_BATTERY_DEVICE_NAME
, acpi_device_bid(device
),
1212 device
->status
.battery_present
? "present" : "absent");
1214 battery
->pm_nb
.notifier_call
= battery_notify
;
1215 register_pm_notifier(&battery
->pm_nb
);
1217 device_init_wakeup(&device
->dev
, 1);
1222 sysfs_remove_battery(battery
);
1223 mutex_destroy(&battery
->lock
);
1224 mutex_destroy(&battery
->sysfs_lock
);
1229 static int acpi_battery_remove(struct acpi_device
*device
)
1231 struct acpi_battery
*battery
= NULL
;
1233 if (!device
|| !acpi_driver_data(device
))
1235 device_init_wakeup(&device
->dev
, 0);
1236 battery
= acpi_driver_data(device
);
1237 unregister_pm_notifier(&battery
->pm_nb
);
1238 #ifdef CONFIG_ACPI_PROCFS_POWER
1239 acpi_battery_remove_fs(device
);
1241 sysfs_remove_battery(battery
);
1242 mutex_destroy(&battery
->lock
);
1243 mutex_destroy(&battery
->sysfs_lock
);
1248 #ifdef CONFIG_PM_SLEEP
1249 /* this is needed to learn about changes made in suspended state */
1250 static int acpi_battery_resume(struct device
*dev
)
1252 struct acpi_battery
*battery
;
1257 battery
= acpi_driver_data(to_acpi_device(dev
));
1261 battery
->update_time
= 0;
1262 acpi_battery_update(battery
, true);
1266 #define acpi_battery_resume NULL
1269 static SIMPLE_DEV_PM_OPS(acpi_battery_pm
, NULL
, acpi_battery_resume
);
1271 static struct acpi_driver acpi_battery_driver
= {
1273 .class = ACPI_BATTERY_CLASS
,
1274 .ids
= battery_device_ids
,
1275 .flags
= ACPI_DRIVER_ALL_NOTIFY_EVENTS
,
1277 .add
= acpi_battery_add
,
1278 .remove
= acpi_battery_remove
,
1279 .notify
= acpi_battery_notify
,
1281 .drv
.pm
= &acpi_battery_pm
,
1284 static void __init
acpi_battery_init_async(void *unused
, async_cookie_t cookie
)
1289 dmi_check_system(bat_dmi_table
);
1291 #ifdef CONFIG_ACPI_PROCFS_POWER
1292 acpi_battery_dir
= acpi_lock_battery_dir();
1293 if (!acpi_battery_dir
)
1296 if (acpi_bus_register_driver(&acpi_battery_driver
) < 0) {
1297 #ifdef CONFIG_ACPI_PROCFS_POWER
1298 acpi_unlock_battery_dir(acpi_battery_dir
);
1305 static int __init
acpi_battery_init(void)
1307 async_schedule(acpi_battery_init_async
, NULL
);
1311 static void __exit
acpi_battery_exit(void)
1313 acpi_bus_unregister_driver(&acpi_battery_driver
);
1314 #ifdef CONFIG_ACPI_PROCFS_POWER
1315 acpi_unlock_battery_dir(acpi_battery_dir
);
1319 module_init(acpi_battery_init
);
1320 module_exit(acpi_battery_exit
);