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1/*
2 * sbs.c - ACPI Smart Battery System Driver ($Revision: 2.0 $)
3 *
4 * Copyright (c) 2007 Alexey Starikovskiy <astarikovskiy@suse.de>
5 * Copyright (c) 2005-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com>
6 * Copyright (c) 2005 Rich Townsend <rhdt@bartol.udel.edu>
7 *
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or (at
13 * your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
23 *
24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25 */
26
27#include <linux/init.h>
28#include <linux/slab.h>
29#include <linux/module.h>
30#include <linux/moduleparam.h>
31#include <linux/kernel.h>
32
33#ifdef CONFIG_ACPI_PROCFS_POWER
34#include <linux/proc_fs.h>
35#include <linux/seq_file.h>
36#include <asm/uaccess.h>
37#endif
38
39#include <linux/acpi.h>
40#include <linux/timer.h>
41#include <linux/jiffies.h>
42#include <linux/delay.h>
43#include <linux/power_supply.h>
44
45#include "sbshc.h"
46
47#define PREFIX "ACPI: "
48
49#define ACPI_SBS_CLASS "sbs"
50#define ACPI_AC_CLASS "ac_adapter"
51#define ACPI_BATTERY_CLASS "battery"
52#define ACPI_SBS_DEVICE_NAME "Smart Battery System"
53#define ACPI_SBS_FILE_INFO "info"
54#define ACPI_SBS_FILE_STATE "state"
55#define ACPI_SBS_FILE_ALARM "alarm"
56#define ACPI_BATTERY_DIR_NAME "BAT%i"
57#define ACPI_AC_DIR_NAME "AC0"
58
59#define ACPI_SBS_NOTIFY_STATUS 0x80
60#define ACPI_SBS_NOTIFY_INFO 0x81
61
62MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
63MODULE_DESCRIPTION("Smart Battery System ACPI interface driver");
64MODULE_LICENSE("GPL");
65
66static unsigned int cache_time = 1000;
67module_param(cache_time, uint, 0644);
68MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
69
70extern struct proc_dir_entry *acpi_lock_ac_dir(void);
71extern struct proc_dir_entry *acpi_lock_battery_dir(void);
72extern void acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
73extern void acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
74
75#define MAX_SBS_BAT 4
76#define ACPI_SBS_BLOCK_MAX 32
77
78static const struct acpi_device_id sbs_device_ids[] = {
79 {"ACPI0002", 0},
80 {"", 0},
81};
82MODULE_DEVICE_TABLE(acpi, sbs_device_ids);
83
84struct acpi_battery {
85 struct power_supply bat;
86 struct acpi_sbs *sbs;
87#ifdef CONFIG_ACPI_PROCFS_POWER
88 struct proc_dir_entry *proc_entry;
89#endif
90 unsigned long update_time;
91 char name[8];
92 char manufacturer_name[ACPI_SBS_BLOCK_MAX];
93 char device_name[ACPI_SBS_BLOCK_MAX];
94 char device_chemistry[ACPI_SBS_BLOCK_MAX];
95 u16 alarm_capacity;
96 u16 full_charge_capacity;
97 u16 design_capacity;
98 u16 design_voltage;
99 u16 serial_number;
100 u16 cycle_count;
101 u16 temp_now;
102 u16 voltage_now;
103 s16 rate_now;
104 s16 rate_avg;
105 u16 capacity_now;
106 u16 state_of_charge;
107 u16 state;
108 u16 mode;
109 u16 spec;
110 u8 id;
111 u8 present:1;
112 u8 have_sysfs_alarm:1;
113};
114
115#define to_acpi_battery(x) container_of(x, struct acpi_battery, bat)
116
117struct acpi_sbs {
118 struct power_supply charger;
119 struct acpi_device *device;
120 struct acpi_smb_hc *hc;
121 struct mutex lock;
122#ifdef CONFIG_ACPI_PROCFS_POWER
123 struct proc_dir_entry *charger_entry;
124#endif
125 struct acpi_battery battery[MAX_SBS_BAT];
126 u8 batteries_supported:4;
127 u8 manager_present:1;
128 u8 charger_present:1;
129};
130
131#define to_acpi_sbs(x) container_of(x, struct acpi_sbs, charger)
132
133static int acpi_sbs_remove(struct acpi_device *device, int type);
134static int acpi_battery_get_state(struct acpi_battery *battery);
135
136static inline int battery_scale(int log)
137{
138 int scale = 1;
139 while (log--)
140 scale *= 10;
141 return scale;
142}
143
144static inline int acpi_battery_vscale(struct acpi_battery *battery)
145{
146 return battery_scale((battery->spec & 0x0f00) >> 8);
147}
148
149static inline int acpi_battery_ipscale(struct acpi_battery *battery)
150{
151 return battery_scale((battery->spec & 0xf000) >> 12);
152}
153
154static inline int acpi_battery_mode(struct acpi_battery *battery)
155{
156 return (battery->mode & 0x8000);
157}
158
159static inline int acpi_battery_scale(struct acpi_battery *battery)
160{
161 return (acpi_battery_mode(battery) ? 10 : 1) *
162 acpi_battery_ipscale(battery);
163}
164
165static int sbs_get_ac_property(struct power_supply *psy,
166 enum power_supply_property psp,
167 union power_supply_propval *val)
168{
169 struct acpi_sbs *sbs = to_acpi_sbs(psy);
170 switch (psp) {
171 case POWER_SUPPLY_PROP_ONLINE:
172 val->intval = sbs->charger_present;
173 break;
174 default:
175 return -EINVAL;
176 }
177 return 0;
178}
179
180static int acpi_battery_technology(struct acpi_battery *battery)
181{
182 if (!strcasecmp("NiCd", battery->device_chemistry))
183 return POWER_SUPPLY_TECHNOLOGY_NiCd;
184 if (!strcasecmp("NiMH", battery->device_chemistry))
185 return POWER_SUPPLY_TECHNOLOGY_NiMH;
186 if (!strcasecmp("LION", battery->device_chemistry))
187 return POWER_SUPPLY_TECHNOLOGY_LION;
188 if (!strcasecmp("LiP", battery->device_chemistry))
189 return POWER_SUPPLY_TECHNOLOGY_LIPO;
190 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
191}
192
193static int acpi_sbs_battery_get_property(struct power_supply *psy,
194 enum power_supply_property psp,
195 union power_supply_propval *val)
196{
197 struct acpi_battery *battery = to_acpi_battery(psy);
198
199 if ((!battery->present) && psp != POWER_SUPPLY_PROP_PRESENT)
200 return -ENODEV;
201
202 acpi_battery_get_state(battery);
203 switch (psp) {
204 case POWER_SUPPLY_PROP_STATUS:
205 if (battery->rate_now < 0)
206 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
207 else if (battery->rate_now > 0)
208 val->intval = POWER_SUPPLY_STATUS_CHARGING;
209 else
210 val->intval = POWER_SUPPLY_STATUS_FULL;
211 break;
212 case POWER_SUPPLY_PROP_PRESENT:
213 val->intval = battery->present;
214 break;
215 case POWER_SUPPLY_PROP_TECHNOLOGY:
216 val->intval = acpi_battery_technology(battery);
217 break;
218 case POWER_SUPPLY_PROP_CYCLE_COUNT:
219 val->intval = battery->cycle_count;
220 break;
221 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
222 val->intval = battery->design_voltage *
223 acpi_battery_vscale(battery) * 1000;
224 break;
225 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
226 val->intval = battery->voltage_now *
227 acpi_battery_vscale(battery) * 1000;
228 break;
229 case POWER_SUPPLY_PROP_CURRENT_NOW:
230 case POWER_SUPPLY_PROP_POWER_NOW:
231 val->intval = abs(battery->rate_now) *
232 acpi_battery_ipscale(battery) * 1000;
233 val->intval *= (acpi_battery_mode(battery)) ?
234 (battery->voltage_now *
235 acpi_battery_vscale(battery) / 1000) : 1;
236 break;
237 case POWER_SUPPLY_PROP_CURRENT_AVG:
238 case POWER_SUPPLY_PROP_POWER_AVG:
239 val->intval = abs(battery->rate_avg) *
240 acpi_battery_ipscale(battery) * 1000;
241 val->intval *= (acpi_battery_mode(battery)) ?
242 (battery->voltage_now *
243 acpi_battery_vscale(battery) / 1000) : 1;
244 break;
245 case POWER_SUPPLY_PROP_CAPACITY:
246 val->intval = battery->state_of_charge;
247 break;
248 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
249 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
250 val->intval = battery->design_capacity *
251 acpi_battery_scale(battery) * 1000;
252 break;
253 case POWER_SUPPLY_PROP_CHARGE_FULL:
254 case POWER_SUPPLY_PROP_ENERGY_FULL:
255 val->intval = battery->full_charge_capacity *
256 acpi_battery_scale(battery) * 1000;
257 break;
258 case POWER_SUPPLY_PROP_CHARGE_NOW:
259 case POWER_SUPPLY_PROP_ENERGY_NOW:
260 val->intval = battery->capacity_now *
261 acpi_battery_scale(battery) * 1000;
262 break;
263 case POWER_SUPPLY_PROP_TEMP:
264 val->intval = battery->temp_now - 2730; // dK -> dC
265 break;
266 case POWER_SUPPLY_PROP_MODEL_NAME:
267 val->strval = battery->device_name;
268 break;
269 case POWER_SUPPLY_PROP_MANUFACTURER:
270 val->strval = battery->manufacturer_name;
271 break;
272 default:
273 return -EINVAL;
274 }
275 return 0;
276}
277
278static enum power_supply_property sbs_ac_props[] = {
279 POWER_SUPPLY_PROP_ONLINE,
280};
281
282static enum power_supply_property sbs_charge_battery_props[] = {
283 POWER_SUPPLY_PROP_STATUS,
284 POWER_SUPPLY_PROP_PRESENT,
285 POWER_SUPPLY_PROP_TECHNOLOGY,
286 POWER_SUPPLY_PROP_CYCLE_COUNT,
287 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
288 POWER_SUPPLY_PROP_VOLTAGE_NOW,
289 POWER_SUPPLY_PROP_CURRENT_NOW,
290 POWER_SUPPLY_PROP_CURRENT_AVG,
291 POWER_SUPPLY_PROP_CAPACITY,
292 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
293 POWER_SUPPLY_PROP_CHARGE_FULL,
294 POWER_SUPPLY_PROP_CHARGE_NOW,
295 POWER_SUPPLY_PROP_TEMP,
296 POWER_SUPPLY_PROP_MODEL_NAME,
297 POWER_SUPPLY_PROP_MANUFACTURER,
298};
299
300static enum power_supply_property sbs_energy_battery_props[] = {
301 POWER_SUPPLY_PROP_STATUS,
302 POWER_SUPPLY_PROP_PRESENT,
303 POWER_SUPPLY_PROP_TECHNOLOGY,
304 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
305 POWER_SUPPLY_PROP_VOLTAGE_NOW,
306 POWER_SUPPLY_PROP_CURRENT_NOW,
307 POWER_SUPPLY_PROP_CURRENT_AVG,
308 POWER_SUPPLY_PROP_POWER_NOW,
309 POWER_SUPPLY_PROP_POWER_AVG,
310 POWER_SUPPLY_PROP_CAPACITY,
311 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
312 POWER_SUPPLY_PROP_ENERGY_FULL,
313 POWER_SUPPLY_PROP_ENERGY_NOW,
314 POWER_SUPPLY_PROP_TEMP,
315 POWER_SUPPLY_PROP_MODEL_NAME,
316 POWER_SUPPLY_PROP_MANUFACTURER,
317};
318
319
320/* --------------------------------------------------------------------------
321 Smart Battery System Management
322 -------------------------------------------------------------------------- */
323
324struct acpi_battery_reader {
325 u8 command; /* command for battery */
326 u8 mode; /* word or block? */
327 size_t offset; /* offset inside struct acpi_sbs_battery */
328};
329
330static struct acpi_battery_reader info_readers[] = {
331 {0x01, SMBUS_READ_WORD, offsetof(struct acpi_battery, alarm_capacity)},
332 {0x03, SMBUS_READ_WORD, offsetof(struct acpi_battery, mode)},
333 {0x10, SMBUS_READ_WORD, offsetof(struct acpi_battery, full_charge_capacity)},
334 {0x17, SMBUS_READ_WORD, offsetof(struct acpi_battery, cycle_count)},
335 {0x18, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_capacity)},
336 {0x19, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_voltage)},
337 {0x1a, SMBUS_READ_WORD, offsetof(struct acpi_battery, spec)},
338 {0x1c, SMBUS_READ_WORD, offsetof(struct acpi_battery, serial_number)},
339 {0x20, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, manufacturer_name)},
340 {0x21, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_name)},
341 {0x22, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_chemistry)},
342};
343
344static struct acpi_battery_reader state_readers[] = {
345 {0x08, SMBUS_READ_WORD, offsetof(struct acpi_battery, temp_now)},
346 {0x09, SMBUS_READ_WORD, offsetof(struct acpi_battery, voltage_now)},
347 {0x0a, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_now)},
348 {0x0b, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_avg)},
349 {0x0f, SMBUS_READ_WORD, offsetof(struct acpi_battery, capacity_now)},
350 {0x0e, SMBUS_READ_WORD, offsetof(struct acpi_battery, state_of_charge)},
351 {0x16, SMBUS_READ_WORD, offsetof(struct acpi_battery, state)},
352};
353
354static int acpi_manager_get_info(struct acpi_sbs *sbs)
355{
356 int result = 0;
357 u16 battery_system_info;
358
359 result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
360 0x04, (u8 *)&battery_system_info);
361 if (!result)
362 sbs->batteries_supported = battery_system_info & 0x000f;
363 return result;
364}
365
366static int acpi_battery_get_info(struct acpi_battery *battery)
367{
368 int i, result = 0;
369
370 for (i = 0; i < ARRAY_SIZE(info_readers); ++i) {
371 result = acpi_smbus_read(battery->sbs->hc,
372 info_readers[i].mode,
373 ACPI_SBS_BATTERY,
374 info_readers[i].command,
375 (u8 *) battery +
376 info_readers[i].offset);
377 if (result)
378 break;
379 }
380 return result;
381}
382
383static int acpi_battery_get_state(struct acpi_battery *battery)
384{
385 int i, result = 0;
386
387 if (battery->update_time &&
388 time_before(jiffies, battery->update_time +
389 msecs_to_jiffies(cache_time)))
390 return 0;
391 for (i = 0; i < ARRAY_SIZE(state_readers); ++i) {
392 result = acpi_smbus_read(battery->sbs->hc,
393 state_readers[i].mode,
394 ACPI_SBS_BATTERY,
395 state_readers[i].command,
396 (u8 *)battery +
397 state_readers[i].offset);
398 if (result)
399 goto end;
400 }
401 end:
402 battery->update_time = jiffies;
403 return result;
404}
405
406static int acpi_battery_get_alarm(struct acpi_battery *battery)
407{
408 return acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
409 ACPI_SBS_BATTERY, 0x01,
410 (u8 *)&battery->alarm_capacity);
411}
412
413static int acpi_battery_set_alarm(struct acpi_battery *battery)
414{
415 struct acpi_sbs *sbs = battery->sbs;
416 u16 value, sel = 1 << (battery->id + 12);
417
418 int ret;
419
420
421 if (sbs->manager_present) {
422 ret = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
423 0x01, (u8 *)&value);
424 if (ret)
425 goto end;
426 if ((value & 0xf000) != sel) {
427 value &= 0x0fff;
428 value |= sel;
429 ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD,
430 ACPI_SBS_MANAGER,
431 0x01, (u8 *)&value, 2);
432 if (ret)
433 goto end;
434 }
435 }
436 ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD, ACPI_SBS_BATTERY,
437 0x01, (u8 *)&battery->alarm_capacity, 2);
438 end:
439 return ret;
440}
441
442static int acpi_ac_get_present(struct acpi_sbs *sbs)
443{
444 int result;
445 u16 status;
446
447 result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_CHARGER,
448 0x13, (u8 *) & status);
449 if (!result)
450 sbs->charger_present = (status >> 15) & 0x1;
451 return result;
452}
453
454static ssize_t acpi_battery_alarm_show(struct device *dev,
455 struct device_attribute *attr,
456 char *buf)
457{
458 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
459 acpi_battery_get_alarm(battery);
460 return sprintf(buf, "%d\n", battery->alarm_capacity *
461 acpi_battery_scale(battery) * 1000);
462}
463
464static ssize_t acpi_battery_alarm_store(struct device *dev,
465 struct device_attribute *attr,
466 const char *buf, size_t count)
467{
468 unsigned long x;
469 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
470 if (sscanf(buf, "%ld\n", &x) == 1)
471 battery->alarm_capacity = x /
472 (1000 * acpi_battery_scale(battery));
473 if (battery->present)
474 acpi_battery_set_alarm(battery);
475 return count;
476}
477
478static struct device_attribute alarm_attr = {
479 .attr = {.name = "alarm", .mode = 0644},
480 .show = acpi_battery_alarm_show,
481 .store = acpi_battery_alarm_store,
482};
483
484/* --------------------------------------------------------------------------
485 FS Interface (/proc/acpi)
486 -------------------------------------------------------------------------- */
487
488#ifdef CONFIG_ACPI_PROCFS_POWER
489/* Generic Routines */
490static int
491acpi_sbs_add_fs(struct proc_dir_entry **dir,
492 struct proc_dir_entry *parent_dir,
493 char *dir_name,
494 const struct file_operations *info_fops,
495 const struct file_operations *state_fops,
496 const struct file_operations *alarm_fops, void *data)
497{
498 printk(KERN_WARNING PREFIX "Deprecated procfs I/F for SBS is loaded,"
499 " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
500 if (!*dir) {
501 *dir = proc_mkdir(dir_name, parent_dir);
502 if (!*dir) {
503 return -ENODEV;
504 }
505 }
506
507 /* 'info' [R] */
508 if (info_fops)
509 proc_create_data(ACPI_SBS_FILE_INFO, S_IRUGO, *dir,
510 info_fops, data);
511
512 /* 'state' [R] */
513 if (state_fops)
514 proc_create_data(ACPI_SBS_FILE_STATE, S_IRUGO, *dir,
515 state_fops, data);
516
517 /* 'alarm' [R/W] */
518 if (alarm_fops)
519 proc_create_data(ACPI_SBS_FILE_ALARM, S_IRUGO, *dir,
520 alarm_fops, data);
521 return 0;
522}
523
524static void
525acpi_sbs_remove_fs(struct proc_dir_entry **dir,
526 struct proc_dir_entry *parent_dir)
527{
528 if (*dir) {
529 remove_proc_entry(ACPI_SBS_FILE_INFO, *dir);
530 remove_proc_entry(ACPI_SBS_FILE_STATE, *dir);
531 remove_proc_entry(ACPI_SBS_FILE_ALARM, *dir);
532 remove_proc_entry((*dir)->name, parent_dir);
533 *dir = NULL;
534 }
535}
536
537/* Smart Battery Interface */
538static struct proc_dir_entry *acpi_battery_dir = NULL;
539
540static inline char *acpi_battery_units(struct acpi_battery *battery)
541{
542 return acpi_battery_mode(battery) ? " mW" : " mA";
543}
544
545
546static int acpi_battery_read_info(struct seq_file *seq, void *offset)
547{
548 struct acpi_battery *battery = seq->private;
549 struct acpi_sbs *sbs = battery->sbs;
550 int result = 0;
551
552 mutex_lock(&sbs->lock);
553
554 seq_printf(seq, "present: %s\n",
555 (battery->present) ? "yes" : "no");
556 if (!battery->present)
557 goto end;
558
559 seq_printf(seq, "design capacity: %i%sh\n",
560 battery->design_capacity * acpi_battery_scale(battery),
561 acpi_battery_units(battery));
562 seq_printf(seq, "last full capacity: %i%sh\n",
563 battery->full_charge_capacity * acpi_battery_scale(battery),
564 acpi_battery_units(battery));
565 seq_printf(seq, "battery technology: rechargeable\n");
566 seq_printf(seq, "design voltage: %i mV\n",
567 battery->design_voltage * acpi_battery_vscale(battery));
568 seq_printf(seq, "design capacity warning: unknown\n");
569 seq_printf(seq, "design capacity low: unknown\n");
570 seq_printf(seq, "cycle count: %i\n", battery->cycle_count);
571 seq_printf(seq, "capacity granularity 1: unknown\n");
572 seq_printf(seq, "capacity granularity 2: unknown\n");
573 seq_printf(seq, "model number: %s\n", battery->device_name);
574 seq_printf(seq, "serial number: %i\n",
575 battery->serial_number);
576 seq_printf(seq, "battery type: %s\n",
577 battery->device_chemistry);
578 seq_printf(seq, "OEM info: %s\n",
579 battery->manufacturer_name);
580 end:
581 mutex_unlock(&sbs->lock);
582 return result;
583}
584
585static int acpi_battery_info_open_fs(struct inode *inode, struct file *file)
586{
587 return single_open(file, acpi_battery_read_info, PDE(inode)->data);
588}
589
590static int acpi_battery_read_state(struct seq_file *seq, void *offset)
591{
592 struct acpi_battery *battery = seq->private;
593 struct acpi_sbs *sbs = battery->sbs;
594 int rate;
595
596 mutex_lock(&sbs->lock);
597 seq_printf(seq, "present: %s\n",
598 (battery->present) ? "yes" : "no");
599 if (!battery->present)
600 goto end;
601
602 acpi_battery_get_state(battery);
603 seq_printf(seq, "capacity state: %s\n",
604 (battery->state & 0x0010) ? "critical" : "ok");
605 seq_printf(seq, "charging state: %s\n",
606 (battery->rate_now < 0) ? "discharging" :
607 ((battery->rate_now > 0) ? "charging" : "charged"));
608 rate = abs(battery->rate_now) * acpi_battery_ipscale(battery);
609 rate *= (acpi_battery_mode(battery))?(battery->voltage_now *
610 acpi_battery_vscale(battery)/1000):1;
611 seq_printf(seq, "present rate: %d%s\n", rate,
612 acpi_battery_units(battery));
613 seq_printf(seq, "remaining capacity: %i%sh\n",
614 battery->capacity_now * acpi_battery_scale(battery),
615 acpi_battery_units(battery));
616 seq_printf(seq, "present voltage: %i mV\n",
617 battery->voltage_now * acpi_battery_vscale(battery));
618
619 end:
620 mutex_unlock(&sbs->lock);
621 return 0;
622}
623
624static int acpi_battery_state_open_fs(struct inode *inode, struct file *file)
625{
626 return single_open(file, acpi_battery_read_state, PDE(inode)->data);
627}
628
629static int acpi_battery_read_alarm(struct seq_file *seq, void *offset)
630{
631 struct acpi_battery *battery = seq->private;
632 struct acpi_sbs *sbs = battery->sbs;
633 int result = 0;
634
635 mutex_lock(&sbs->lock);
636
637 if (!battery->present) {
638 seq_printf(seq, "present: no\n");
639 goto end;
640 }
641
642 acpi_battery_get_alarm(battery);
643 seq_printf(seq, "alarm: ");
644 if (battery->alarm_capacity)
645 seq_printf(seq, "%i%sh\n",
646 battery->alarm_capacity *
647 acpi_battery_scale(battery),
648 acpi_battery_units(battery));
649 else
650 seq_printf(seq, "disabled\n");
651 end:
652 mutex_unlock(&sbs->lock);
653 return result;
654}
655
656static ssize_t
657acpi_battery_write_alarm(struct file *file, const char __user * buffer,
658 size_t count, loff_t * ppos)
659{
660 struct seq_file *seq = file->private_data;
661 struct acpi_battery *battery = seq->private;
662 struct acpi_sbs *sbs = battery->sbs;
663 char alarm_string[12] = { '\0' };
664 int result = 0;
665 mutex_lock(&sbs->lock);
666 if (!battery->present) {
667 result = -ENODEV;
668 goto end;
669 }
670 if (count > sizeof(alarm_string) - 1) {
671 result = -EINVAL;
672 goto end;
673 }
674 if (copy_from_user(alarm_string, buffer, count)) {
675 result = -EFAULT;
676 goto end;
677 }
678 alarm_string[count] = 0;
679 battery->alarm_capacity = simple_strtoul(alarm_string, NULL, 0) /
680 acpi_battery_scale(battery);
681 acpi_battery_set_alarm(battery);
682 end:
683 mutex_unlock(&sbs->lock);
684 if (result)
685 return result;
686 return count;
687}
688
689static int acpi_battery_alarm_open_fs(struct inode *inode, struct file *file)
690{
691 return single_open(file, acpi_battery_read_alarm, PDE(inode)->data);
692}
693
694static const struct file_operations acpi_battery_info_fops = {
695 .open = acpi_battery_info_open_fs,
696 .read = seq_read,
697 .llseek = seq_lseek,
698 .release = single_release,
699 .owner = THIS_MODULE,
700};
701
702static const struct file_operations acpi_battery_state_fops = {
703 .open = acpi_battery_state_open_fs,
704 .read = seq_read,
705 .llseek = seq_lseek,
706 .release = single_release,
707 .owner = THIS_MODULE,
708};
709
710static const struct file_operations acpi_battery_alarm_fops = {
711 .open = acpi_battery_alarm_open_fs,
712 .read = seq_read,
713 .write = acpi_battery_write_alarm,
714 .llseek = seq_lseek,
715 .release = single_release,
716 .owner = THIS_MODULE,
717};
718
719/* Legacy AC Adapter Interface */
720
721static struct proc_dir_entry *acpi_ac_dir = NULL;
722
723static int acpi_ac_read_state(struct seq_file *seq, void *offset)
724{
725
726 struct acpi_sbs *sbs = seq->private;
727
728 mutex_lock(&sbs->lock);
729
730 seq_printf(seq, "state: %s\n",
731 sbs->charger_present ? "on-line" : "off-line");
732
733 mutex_unlock(&sbs->lock);
734 return 0;
735}
736
737static int acpi_ac_state_open_fs(struct inode *inode, struct file *file)
738{
739 return single_open(file, acpi_ac_read_state, PDE(inode)->data);
740}
741
742static const struct file_operations acpi_ac_state_fops = {
743 .open = acpi_ac_state_open_fs,
744 .read = seq_read,
745 .llseek = seq_lseek,
746 .release = single_release,
747 .owner = THIS_MODULE,
748};
749
750#endif
751
752/* --------------------------------------------------------------------------
753 Driver Interface
754 -------------------------------------------------------------------------- */
755static int acpi_battery_read(struct acpi_battery *battery)
756{
757 int result = 0, saved_present = battery->present;
758 u16 state;
759
760 if (battery->sbs->manager_present) {
761 result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
762 ACPI_SBS_MANAGER, 0x01, (u8 *)&state);
763 if (!result)
764 battery->present = state & (1 << battery->id);
765 state &= 0x0fff;
766 state |= 1 << (battery->id + 12);
767 acpi_smbus_write(battery->sbs->hc, SMBUS_WRITE_WORD,
768 ACPI_SBS_MANAGER, 0x01, (u8 *)&state, 2);
769 } else if (battery->id == 0)
770 battery->present = 1;
771 if (result || !battery->present)
772 return result;
773
774 if (saved_present != battery->present) {
775 battery->update_time = 0;
776 result = acpi_battery_get_info(battery);
777 if (result)
778 return result;
779 }
780 result = acpi_battery_get_state(battery);
781 return result;
782}
783
784/* Smart Battery */
785static int acpi_battery_add(struct acpi_sbs *sbs, int id)
786{
787 struct acpi_battery *battery = &sbs->battery[id];
788 int result;
789
790 battery->id = id;
791 battery->sbs = sbs;
792 result = acpi_battery_read(battery);
793 if (result)
794 return result;
795
796 sprintf(battery->name, ACPI_BATTERY_DIR_NAME, id);
797#ifdef CONFIG_ACPI_PROCFS_POWER
798 acpi_sbs_add_fs(&battery->proc_entry, acpi_battery_dir,
799 battery->name, &acpi_battery_info_fops,
800 &acpi_battery_state_fops, &acpi_battery_alarm_fops,
801 battery);
802#endif
803 battery->bat.name = battery->name;
804 battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
805 if (!acpi_battery_mode(battery)) {
806 battery->bat.properties = sbs_charge_battery_props;
807 battery->bat.num_properties =
808 ARRAY_SIZE(sbs_charge_battery_props);
809 } else {
810 battery->bat.properties = sbs_energy_battery_props;
811 battery->bat.num_properties =
812 ARRAY_SIZE(sbs_energy_battery_props);
813 }
814 battery->bat.get_property = acpi_sbs_battery_get_property;
815 result = power_supply_register(&sbs->device->dev, &battery->bat);
816 if (result)
817 goto end;
818 result = device_create_file(battery->bat.dev, &alarm_attr);
819 if (result)
820 goto end;
821 battery->have_sysfs_alarm = 1;
822 end:
823 printk(KERN_INFO PREFIX "%s [%s]: Battery Slot [%s] (battery %s)\n",
824 ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
825 battery->name, battery->present ? "present" : "absent");
826 return result;
827}
828
829static void acpi_battery_remove(struct acpi_sbs *sbs, int id)
830{
831 struct acpi_battery *battery = &sbs->battery[id];
832
833 if (battery->bat.dev) {
834 if (battery->have_sysfs_alarm)
835 device_remove_file(battery->bat.dev, &alarm_attr);
836 power_supply_unregister(&battery->bat);
837 }
838#ifdef CONFIG_ACPI_PROCFS_POWER
839 if (battery->proc_entry)
840 acpi_sbs_remove_fs(&battery->proc_entry, acpi_battery_dir);
841#endif
842}
843
844static int acpi_charger_add(struct acpi_sbs *sbs)
845{
846 int result;
847
848 result = acpi_ac_get_present(sbs);
849 if (result)
850 goto end;
851#ifdef CONFIG_ACPI_PROCFS_POWER
852 result = acpi_sbs_add_fs(&sbs->charger_entry, acpi_ac_dir,
853 ACPI_AC_DIR_NAME, NULL,
854 &acpi_ac_state_fops, NULL, sbs);
855 if (result)
856 goto end;
857#endif
858 sbs->charger.name = "sbs-charger";
859 sbs->charger.type = POWER_SUPPLY_TYPE_MAINS;
860 sbs->charger.properties = sbs_ac_props;
861 sbs->charger.num_properties = ARRAY_SIZE(sbs_ac_props);
862 sbs->charger.get_property = sbs_get_ac_property;
863 power_supply_register(&sbs->device->dev, &sbs->charger);
864 printk(KERN_INFO PREFIX "%s [%s]: AC Adapter [%s] (%s)\n",
865 ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
866 ACPI_AC_DIR_NAME, sbs->charger_present ? "on-line" : "off-line");
867 end:
868 return result;
869}
870
871static void acpi_charger_remove(struct acpi_sbs *sbs)
872{
873 if (sbs->charger.dev)
874 power_supply_unregister(&sbs->charger);
875#ifdef CONFIG_ACPI_PROCFS_POWER
876 if (sbs->charger_entry)
877 acpi_sbs_remove_fs(&sbs->charger_entry, acpi_ac_dir);
878#endif
879}
880
881static void acpi_sbs_callback(void *context)
882{
883 int id;
884 struct acpi_sbs *sbs = context;
885 struct acpi_battery *bat;
886 u8 saved_charger_state = sbs->charger_present;
887 u8 saved_battery_state;
888 acpi_ac_get_present(sbs);
889 if (sbs->charger_present != saved_charger_state) {
890#ifdef CONFIG_ACPI_PROC_EVENT
891 acpi_bus_generate_proc_event4(ACPI_AC_CLASS, ACPI_AC_DIR_NAME,
892 ACPI_SBS_NOTIFY_STATUS,
893 sbs->charger_present);
894#endif
895 kobject_uevent(&sbs->charger.dev->kobj, KOBJ_CHANGE);
896 }
897 if (sbs->manager_present) {
898 for (id = 0; id < MAX_SBS_BAT; ++id) {
899 if (!(sbs->batteries_supported & (1 << id)))
900 continue;
901 bat = &sbs->battery[id];
902 saved_battery_state = bat->present;
903 acpi_battery_read(bat);
904 if (saved_battery_state == bat->present)
905 continue;
906#ifdef CONFIG_ACPI_PROC_EVENT
907 acpi_bus_generate_proc_event4(ACPI_BATTERY_CLASS,
908 bat->name,
909 ACPI_SBS_NOTIFY_STATUS,
910 bat->present);
911#endif
912 kobject_uevent(&bat->bat.dev->kobj, KOBJ_CHANGE);
913 }
914 }
915}
916
917static int acpi_sbs_add(struct acpi_device *device)
918{
919 struct acpi_sbs *sbs;
920 int result = 0;
921 int id;
922
923 sbs = kzalloc(sizeof(struct acpi_sbs), GFP_KERNEL);
924 if (!sbs) {
925 result = -ENOMEM;
926 goto end;
927 }
928
929 mutex_init(&sbs->lock);
930
931 sbs->hc = acpi_driver_data(device->parent);
932 sbs->device = device;
933 strcpy(acpi_device_name(device), ACPI_SBS_DEVICE_NAME);
934 strcpy(acpi_device_class(device), ACPI_SBS_CLASS);
935 device->driver_data = sbs;
936
937 result = acpi_charger_add(sbs);
938 if (result)
939 goto end;
940
941 result = acpi_manager_get_info(sbs);
942 if (!result) {
943 sbs->manager_present = 1;
944 for (id = 0; id < MAX_SBS_BAT; ++id)
945 if ((sbs->batteries_supported & (1 << id)))
946 acpi_battery_add(sbs, id);
947 } else
948 acpi_battery_add(sbs, 0);
949 acpi_smbus_register_callback(sbs->hc, acpi_sbs_callback, sbs);
950 end:
951 if (result)
952 acpi_sbs_remove(device, 0);
953 return result;
954}
955
956static int acpi_sbs_remove(struct acpi_device *device, int type)
957{
958 struct acpi_sbs *sbs;
959 int id;
960
961 if (!device)
962 return -EINVAL;
963 sbs = acpi_driver_data(device);
964 if (!sbs)
965 return -EINVAL;
966 mutex_lock(&sbs->lock);
967 acpi_smbus_unregister_callback(sbs->hc);
968 for (id = 0; id < MAX_SBS_BAT; ++id)
969 acpi_battery_remove(sbs, id);
970 acpi_charger_remove(sbs);
971 mutex_unlock(&sbs->lock);
972 mutex_destroy(&sbs->lock);
973 kfree(sbs);
974 return 0;
975}
976
977static void acpi_sbs_rmdirs(void)
978{
979#ifdef CONFIG_ACPI_PROCFS_POWER
980 if (acpi_ac_dir) {
981 acpi_unlock_ac_dir(acpi_ac_dir);
982 acpi_ac_dir = NULL;
983 }
984 if (acpi_battery_dir) {
985 acpi_unlock_battery_dir(acpi_battery_dir);
986 acpi_battery_dir = NULL;
987 }
988#endif
989}
990
991static int acpi_sbs_resume(struct acpi_device *device)
992{
993 struct acpi_sbs *sbs;
994 if (!device)
995 return -EINVAL;
996 sbs = device->driver_data;
997 acpi_sbs_callback(sbs);
998 return 0;
999}
1000
1001static struct acpi_driver acpi_sbs_driver = {
1002 .name = "sbs",
1003 .class = ACPI_SBS_CLASS,
1004 .ids = sbs_device_ids,
1005 .ops = {
1006 .add = acpi_sbs_add,
1007 .remove = acpi_sbs_remove,
1008 .resume = acpi_sbs_resume,
1009 },
1010};
1011
1012static int __init acpi_sbs_init(void)
1013{
1014 int result = 0;
1015
1016 if (acpi_disabled)
1017 return -ENODEV;
1018#ifdef CONFIG_ACPI_PROCFS_POWER
1019 acpi_ac_dir = acpi_lock_ac_dir();
1020 if (!acpi_ac_dir)
1021 return -ENODEV;
1022 acpi_battery_dir = acpi_lock_battery_dir();
1023 if (!acpi_battery_dir) {
1024 acpi_sbs_rmdirs();
1025 return -ENODEV;
1026 }
1027#endif
1028 result = acpi_bus_register_driver(&acpi_sbs_driver);
1029 if (result < 0) {
1030 acpi_sbs_rmdirs();
1031 return -ENODEV;
1032 }
1033 return 0;
1034}
1035
1036static void __exit acpi_sbs_exit(void)
1037{
1038 acpi_bus_unregister_driver(&acpi_sbs_driver);
1039 acpi_sbs_rmdirs();
1040 return;
1041}
1042
1043module_init(acpi_sbs_init);
1044module_exit(acpi_sbs_exit);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * sbs.c - ACPI Smart Battery System Driver ($Revision: 2.0 $)
4 *
5 * Copyright (c) 2007 Alexey Starikovskiy <astarikovskiy@suse.de>
6 * Copyright (c) 2005-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com>
7 * Copyright (c) 2005 Rich Townsend <rhdt@bartol.udel.edu>
8 */
9
10#include <linux/init.h>
11#include <linux/slab.h>
12#include <linux/module.h>
13#include <linux/moduleparam.h>
14#include <linux/kernel.h>
15
16#include <linux/acpi.h>
17#include <linux/timer.h>
18#include <linux/jiffies.h>
19#include <linux/delay.h>
20#include <linux/power_supply.h>
21#include <linux/platform_data/x86/apple.h>
22#include <acpi/battery.h>
23
24#include "sbshc.h"
25
26#define PREFIX "ACPI: "
27
28#define ACPI_SBS_CLASS "sbs"
29#define ACPI_AC_CLASS "ac_adapter"
30#define ACPI_SBS_DEVICE_NAME "Smart Battery System"
31#define ACPI_SBS_FILE_INFO "info"
32#define ACPI_SBS_FILE_STATE "state"
33#define ACPI_SBS_FILE_ALARM "alarm"
34#define ACPI_BATTERY_DIR_NAME "BAT%i"
35#define ACPI_AC_DIR_NAME "AC0"
36
37#define ACPI_SBS_NOTIFY_STATUS 0x80
38#define ACPI_SBS_NOTIFY_INFO 0x81
39
40MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
41MODULE_DESCRIPTION("Smart Battery System ACPI interface driver");
42MODULE_LICENSE("GPL");
43
44static unsigned int cache_time = 1000;
45module_param(cache_time, uint, 0644);
46MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
47
48#define MAX_SBS_BAT 4
49#define ACPI_SBS_BLOCK_MAX 32
50
51static const struct acpi_device_id sbs_device_ids[] = {
52 {"ACPI0002", 0},
53 {"", 0},
54};
55MODULE_DEVICE_TABLE(acpi, sbs_device_ids);
56
57struct acpi_battery {
58 struct power_supply *bat;
59 struct power_supply_desc bat_desc;
60 struct acpi_sbs *sbs;
61 unsigned long update_time;
62 char name[8];
63 char manufacturer_name[ACPI_SBS_BLOCK_MAX];
64 char device_name[ACPI_SBS_BLOCK_MAX];
65 char device_chemistry[ACPI_SBS_BLOCK_MAX];
66 u16 alarm_capacity;
67 u16 full_charge_capacity;
68 u16 design_capacity;
69 u16 design_voltage;
70 u16 serial_number;
71 u16 cycle_count;
72 u16 temp_now;
73 u16 voltage_now;
74 s16 rate_now;
75 s16 rate_avg;
76 u16 capacity_now;
77 u16 state_of_charge;
78 u16 state;
79 u16 mode;
80 u16 spec;
81 u8 id;
82 u8 present:1;
83 u8 have_sysfs_alarm:1;
84};
85
86#define to_acpi_battery(x) power_supply_get_drvdata(x)
87
88struct acpi_sbs {
89 struct power_supply *charger;
90 struct acpi_device *device;
91 struct acpi_smb_hc *hc;
92 struct mutex lock;
93 struct acpi_battery battery[MAX_SBS_BAT];
94 u8 batteries_supported:4;
95 u8 manager_present:1;
96 u8 charger_present:1;
97 u8 charger_exists:1;
98};
99
100#define to_acpi_sbs(x) power_supply_get_drvdata(x)
101
102static int acpi_sbs_remove(struct acpi_device *device);
103static int acpi_battery_get_state(struct acpi_battery *battery);
104
105static inline int battery_scale(int log)
106{
107 int scale = 1;
108 while (log--)
109 scale *= 10;
110 return scale;
111}
112
113static inline int acpi_battery_vscale(struct acpi_battery *battery)
114{
115 return battery_scale((battery->spec & 0x0f00) >> 8);
116}
117
118static inline int acpi_battery_ipscale(struct acpi_battery *battery)
119{
120 return battery_scale((battery->spec & 0xf000) >> 12);
121}
122
123static inline int acpi_battery_mode(struct acpi_battery *battery)
124{
125 return (battery->mode & 0x8000);
126}
127
128static inline int acpi_battery_scale(struct acpi_battery *battery)
129{
130 return (acpi_battery_mode(battery) ? 10 : 1) *
131 acpi_battery_ipscale(battery);
132}
133
134static int sbs_get_ac_property(struct power_supply *psy,
135 enum power_supply_property psp,
136 union power_supply_propval *val)
137{
138 struct acpi_sbs *sbs = to_acpi_sbs(psy);
139 switch (psp) {
140 case POWER_SUPPLY_PROP_ONLINE:
141 val->intval = sbs->charger_present;
142 break;
143 default:
144 return -EINVAL;
145 }
146 return 0;
147}
148
149static int acpi_battery_technology(struct acpi_battery *battery)
150{
151 if (!strcasecmp("NiCd", battery->device_chemistry))
152 return POWER_SUPPLY_TECHNOLOGY_NiCd;
153 if (!strcasecmp("NiMH", battery->device_chemistry))
154 return POWER_SUPPLY_TECHNOLOGY_NiMH;
155 if (!strcasecmp("LION", battery->device_chemistry))
156 return POWER_SUPPLY_TECHNOLOGY_LION;
157 if (!strcasecmp("LiP", battery->device_chemistry))
158 return POWER_SUPPLY_TECHNOLOGY_LIPO;
159 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
160}
161
162static int acpi_sbs_battery_get_property(struct power_supply *psy,
163 enum power_supply_property psp,
164 union power_supply_propval *val)
165{
166 struct acpi_battery *battery = to_acpi_battery(psy);
167
168 if ((!battery->present) && psp != POWER_SUPPLY_PROP_PRESENT)
169 return -ENODEV;
170
171 acpi_battery_get_state(battery);
172 switch (psp) {
173 case POWER_SUPPLY_PROP_STATUS:
174 if (battery->rate_now < 0)
175 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
176 else if (battery->rate_now > 0)
177 val->intval = POWER_SUPPLY_STATUS_CHARGING;
178 else
179 val->intval = POWER_SUPPLY_STATUS_FULL;
180 break;
181 case POWER_SUPPLY_PROP_PRESENT:
182 val->intval = battery->present;
183 break;
184 case POWER_SUPPLY_PROP_TECHNOLOGY:
185 val->intval = acpi_battery_technology(battery);
186 break;
187 case POWER_SUPPLY_PROP_CYCLE_COUNT:
188 val->intval = battery->cycle_count;
189 break;
190 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
191 val->intval = battery->design_voltage *
192 acpi_battery_vscale(battery) * 1000;
193 break;
194 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
195 val->intval = battery->voltage_now *
196 acpi_battery_vscale(battery) * 1000;
197 break;
198 case POWER_SUPPLY_PROP_CURRENT_NOW:
199 case POWER_SUPPLY_PROP_POWER_NOW:
200 val->intval = abs(battery->rate_now) *
201 acpi_battery_ipscale(battery) * 1000;
202 val->intval *= (acpi_battery_mode(battery)) ?
203 (battery->voltage_now *
204 acpi_battery_vscale(battery) / 1000) : 1;
205 break;
206 case POWER_SUPPLY_PROP_CURRENT_AVG:
207 case POWER_SUPPLY_PROP_POWER_AVG:
208 val->intval = abs(battery->rate_avg) *
209 acpi_battery_ipscale(battery) * 1000;
210 val->intval *= (acpi_battery_mode(battery)) ?
211 (battery->voltage_now *
212 acpi_battery_vscale(battery) / 1000) : 1;
213 break;
214 case POWER_SUPPLY_PROP_CAPACITY:
215 val->intval = battery->state_of_charge;
216 break;
217 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
218 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
219 val->intval = battery->design_capacity *
220 acpi_battery_scale(battery) * 1000;
221 break;
222 case POWER_SUPPLY_PROP_CHARGE_FULL:
223 case POWER_SUPPLY_PROP_ENERGY_FULL:
224 val->intval = battery->full_charge_capacity *
225 acpi_battery_scale(battery) * 1000;
226 break;
227 case POWER_SUPPLY_PROP_CHARGE_NOW:
228 case POWER_SUPPLY_PROP_ENERGY_NOW:
229 val->intval = battery->capacity_now *
230 acpi_battery_scale(battery) * 1000;
231 break;
232 case POWER_SUPPLY_PROP_TEMP:
233 val->intval = battery->temp_now - 2730; // dK -> dC
234 break;
235 case POWER_SUPPLY_PROP_MODEL_NAME:
236 val->strval = battery->device_name;
237 break;
238 case POWER_SUPPLY_PROP_MANUFACTURER:
239 val->strval = battery->manufacturer_name;
240 break;
241 default:
242 return -EINVAL;
243 }
244 return 0;
245}
246
247static enum power_supply_property sbs_ac_props[] = {
248 POWER_SUPPLY_PROP_ONLINE,
249};
250
251static enum power_supply_property sbs_charge_battery_props[] = {
252 POWER_SUPPLY_PROP_STATUS,
253 POWER_SUPPLY_PROP_PRESENT,
254 POWER_SUPPLY_PROP_TECHNOLOGY,
255 POWER_SUPPLY_PROP_CYCLE_COUNT,
256 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
257 POWER_SUPPLY_PROP_VOLTAGE_NOW,
258 POWER_SUPPLY_PROP_CURRENT_NOW,
259 POWER_SUPPLY_PROP_CURRENT_AVG,
260 POWER_SUPPLY_PROP_CAPACITY,
261 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
262 POWER_SUPPLY_PROP_CHARGE_FULL,
263 POWER_SUPPLY_PROP_CHARGE_NOW,
264 POWER_SUPPLY_PROP_TEMP,
265 POWER_SUPPLY_PROP_MODEL_NAME,
266 POWER_SUPPLY_PROP_MANUFACTURER,
267};
268
269static enum power_supply_property sbs_energy_battery_props[] = {
270 POWER_SUPPLY_PROP_STATUS,
271 POWER_SUPPLY_PROP_PRESENT,
272 POWER_SUPPLY_PROP_TECHNOLOGY,
273 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
274 POWER_SUPPLY_PROP_VOLTAGE_NOW,
275 POWER_SUPPLY_PROP_CURRENT_NOW,
276 POWER_SUPPLY_PROP_CURRENT_AVG,
277 POWER_SUPPLY_PROP_POWER_NOW,
278 POWER_SUPPLY_PROP_POWER_AVG,
279 POWER_SUPPLY_PROP_CAPACITY,
280 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
281 POWER_SUPPLY_PROP_ENERGY_FULL,
282 POWER_SUPPLY_PROP_ENERGY_NOW,
283 POWER_SUPPLY_PROP_TEMP,
284 POWER_SUPPLY_PROP_MODEL_NAME,
285 POWER_SUPPLY_PROP_MANUFACTURER,
286};
287
288static const struct power_supply_desc acpi_sbs_charger_desc = {
289 .name = "sbs-charger",
290 .type = POWER_SUPPLY_TYPE_MAINS,
291 .properties = sbs_ac_props,
292 .num_properties = ARRAY_SIZE(sbs_ac_props),
293 .get_property = sbs_get_ac_property,
294};
295
296/* --------------------------------------------------------------------------
297 Smart Battery System Management
298 -------------------------------------------------------------------------- */
299
300struct acpi_battery_reader {
301 u8 command; /* command for battery */
302 u8 mode; /* word or block? */
303 size_t offset; /* offset inside struct acpi_sbs_battery */
304};
305
306static struct acpi_battery_reader info_readers[] = {
307 {0x01, SMBUS_READ_WORD, offsetof(struct acpi_battery, alarm_capacity)},
308 {0x03, SMBUS_READ_WORD, offsetof(struct acpi_battery, mode)},
309 {0x10, SMBUS_READ_WORD, offsetof(struct acpi_battery, full_charge_capacity)},
310 {0x17, SMBUS_READ_WORD, offsetof(struct acpi_battery, cycle_count)},
311 {0x18, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_capacity)},
312 {0x19, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_voltage)},
313 {0x1a, SMBUS_READ_WORD, offsetof(struct acpi_battery, spec)},
314 {0x1c, SMBUS_READ_WORD, offsetof(struct acpi_battery, serial_number)},
315 {0x20, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, manufacturer_name)},
316 {0x21, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_name)},
317 {0x22, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_chemistry)},
318};
319
320static struct acpi_battery_reader state_readers[] = {
321 {0x08, SMBUS_READ_WORD, offsetof(struct acpi_battery, temp_now)},
322 {0x09, SMBUS_READ_WORD, offsetof(struct acpi_battery, voltage_now)},
323 {0x0a, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_now)},
324 {0x0b, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_avg)},
325 {0x0f, SMBUS_READ_WORD, offsetof(struct acpi_battery, capacity_now)},
326 {0x0e, SMBUS_READ_WORD, offsetof(struct acpi_battery, state_of_charge)},
327 {0x16, SMBUS_READ_WORD, offsetof(struct acpi_battery, state)},
328};
329
330static int acpi_manager_get_info(struct acpi_sbs *sbs)
331{
332 int result = 0;
333 u16 battery_system_info;
334
335 result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
336 0x04, (u8 *)&battery_system_info);
337 if (!result)
338 sbs->batteries_supported = battery_system_info & 0x000f;
339 return result;
340}
341
342static int acpi_battery_get_info(struct acpi_battery *battery)
343{
344 int i, result = 0;
345
346 for (i = 0; i < ARRAY_SIZE(info_readers); ++i) {
347 result = acpi_smbus_read(battery->sbs->hc,
348 info_readers[i].mode,
349 ACPI_SBS_BATTERY,
350 info_readers[i].command,
351 (u8 *) battery +
352 info_readers[i].offset);
353 if (result)
354 break;
355 }
356 return result;
357}
358
359static int acpi_battery_get_state(struct acpi_battery *battery)
360{
361 int i, result = 0;
362
363 if (battery->update_time &&
364 time_before(jiffies, battery->update_time +
365 msecs_to_jiffies(cache_time)))
366 return 0;
367 for (i = 0; i < ARRAY_SIZE(state_readers); ++i) {
368 result = acpi_smbus_read(battery->sbs->hc,
369 state_readers[i].mode,
370 ACPI_SBS_BATTERY,
371 state_readers[i].command,
372 (u8 *)battery +
373 state_readers[i].offset);
374 if (result)
375 goto end;
376 }
377 end:
378 battery->update_time = jiffies;
379 return result;
380}
381
382static int acpi_battery_get_alarm(struct acpi_battery *battery)
383{
384 return acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
385 ACPI_SBS_BATTERY, 0x01,
386 (u8 *)&battery->alarm_capacity);
387}
388
389static int acpi_battery_set_alarm(struct acpi_battery *battery)
390{
391 struct acpi_sbs *sbs = battery->sbs;
392 u16 value, sel = 1 << (battery->id + 12);
393
394 int ret;
395
396
397 if (sbs->manager_present) {
398 ret = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
399 0x01, (u8 *)&value);
400 if (ret)
401 goto end;
402 if ((value & 0xf000) != sel) {
403 value &= 0x0fff;
404 value |= sel;
405 ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD,
406 ACPI_SBS_MANAGER,
407 0x01, (u8 *)&value, 2);
408 if (ret)
409 goto end;
410 }
411 }
412 ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD, ACPI_SBS_BATTERY,
413 0x01, (u8 *)&battery->alarm_capacity, 2);
414 end:
415 return ret;
416}
417
418static int acpi_ac_get_present(struct acpi_sbs *sbs)
419{
420 int result;
421 u16 status;
422
423 result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_CHARGER,
424 0x13, (u8 *) & status);
425
426 if (result)
427 return result;
428
429 /*
430 * The spec requires that bit 4 always be 1. If it's not set, assume
431 * that the implementation doesn't support an SBS charger.
432 *
433 * And on some MacBooks a status of 0xffff is always returned, no
434 * matter whether the charger is plugged in or not, which is also
435 * wrong, so ignore the SBS charger for those too.
436 */
437 if (!((status >> 4) & 0x1) || status == 0xffff)
438 return -ENODEV;
439
440 sbs->charger_present = (status >> 15) & 0x1;
441 return 0;
442}
443
444static ssize_t acpi_battery_alarm_show(struct device *dev,
445 struct device_attribute *attr,
446 char *buf)
447{
448 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
449 acpi_battery_get_alarm(battery);
450 return sprintf(buf, "%d\n", battery->alarm_capacity *
451 acpi_battery_scale(battery) * 1000);
452}
453
454static ssize_t acpi_battery_alarm_store(struct device *dev,
455 struct device_attribute *attr,
456 const char *buf, size_t count)
457{
458 unsigned long x;
459 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
460 if (sscanf(buf, "%lu\n", &x) == 1)
461 battery->alarm_capacity = x /
462 (1000 * acpi_battery_scale(battery));
463 if (battery->present)
464 acpi_battery_set_alarm(battery);
465 return count;
466}
467
468static const struct device_attribute alarm_attr = {
469 .attr = {.name = "alarm", .mode = 0644},
470 .show = acpi_battery_alarm_show,
471 .store = acpi_battery_alarm_store,
472};
473
474/* --------------------------------------------------------------------------
475 Driver Interface
476 -------------------------------------------------------------------------- */
477static int acpi_battery_read(struct acpi_battery *battery)
478{
479 int result = 0, saved_present = battery->present;
480 u16 state;
481
482 if (battery->sbs->manager_present) {
483 result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
484 ACPI_SBS_MANAGER, 0x01, (u8 *)&state);
485 if (!result)
486 battery->present = state & (1 << battery->id);
487 state &= 0x0fff;
488 state |= 1 << (battery->id + 12);
489 acpi_smbus_write(battery->sbs->hc, SMBUS_WRITE_WORD,
490 ACPI_SBS_MANAGER, 0x01, (u8 *)&state, 2);
491 } else if (battery->id == 0)
492 battery->present = 1;
493
494 if (result || !battery->present)
495 return result;
496
497 if (saved_present != battery->present) {
498 battery->update_time = 0;
499 result = acpi_battery_get_info(battery);
500 if (result) {
501 battery->present = 0;
502 return result;
503 }
504 }
505 result = acpi_battery_get_state(battery);
506 if (result)
507 battery->present = 0;
508 return result;
509}
510
511/* Smart Battery */
512static int acpi_battery_add(struct acpi_sbs *sbs, int id)
513{
514 struct acpi_battery *battery = &sbs->battery[id];
515 struct power_supply_config psy_cfg = { .drv_data = battery, };
516 int result;
517
518 battery->id = id;
519 battery->sbs = sbs;
520 result = acpi_battery_read(battery);
521 if (result)
522 return result;
523
524 sprintf(battery->name, ACPI_BATTERY_DIR_NAME, id);
525 battery->bat_desc.name = battery->name;
526 battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY;
527 if (!acpi_battery_mode(battery)) {
528 battery->bat_desc.properties = sbs_charge_battery_props;
529 battery->bat_desc.num_properties =
530 ARRAY_SIZE(sbs_charge_battery_props);
531 } else {
532 battery->bat_desc.properties = sbs_energy_battery_props;
533 battery->bat_desc.num_properties =
534 ARRAY_SIZE(sbs_energy_battery_props);
535 }
536 battery->bat_desc.get_property = acpi_sbs_battery_get_property;
537 battery->bat = power_supply_register(&sbs->device->dev,
538 &battery->bat_desc, &psy_cfg);
539 if (IS_ERR(battery->bat)) {
540 result = PTR_ERR(battery->bat);
541 battery->bat = NULL;
542 goto end;
543 }
544
545 result = device_create_file(&battery->bat->dev, &alarm_attr);
546 if (result)
547 goto end;
548 battery->have_sysfs_alarm = 1;
549 end:
550 printk(KERN_INFO PREFIX "%s [%s]: Battery Slot [%s] (battery %s)\n",
551 ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
552 battery->name, battery->present ? "present" : "absent");
553 return result;
554}
555
556static void acpi_battery_remove(struct acpi_sbs *sbs, int id)
557{
558 struct acpi_battery *battery = &sbs->battery[id];
559
560 if (battery->bat) {
561 if (battery->have_sysfs_alarm)
562 device_remove_file(&battery->bat->dev, &alarm_attr);
563 power_supply_unregister(battery->bat);
564 }
565}
566
567static int acpi_charger_add(struct acpi_sbs *sbs)
568{
569 int result;
570 struct power_supply_config psy_cfg = { .drv_data = sbs, };
571
572 result = acpi_ac_get_present(sbs);
573 if (result)
574 goto end;
575
576 sbs->charger_exists = 1;
577 sbs->charger = power_supply_register(&sbs->device->dev,
578 &acpi_sbs_charger_desc, &psy_cfg);
579 if (IS_ERR(sbs->charger)) {
580 result = PTR_ERR(sbs->charger);
581 sbs->charger = NULL;
582 }
583 printk(KERN_INFO PREFIX "%s [%s]: AC Adapter [%s] (%s)\n",
584 ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
585 ACPI_AC_DIR_NAME, sbs->charger_present ? "on-line" : "off-line");
586 end:
587 return result;
588}
589
590static void acpi_charger_remove(struct acpi_sbs *sbs)
591{
592 if (sbs->charger)
593 power_supply_unregister(sbs->charger);
594}
595
596static void acpi_sbs_callback(void *context)
597{
598 int id;
599 struct acpi_sbs *sbs = context;
600 struct acpi_battery *bat;
601 u8 saved_charger_state = sbs->charger_present;
602 u8 saved_battery_state;
603
604 if (sbs->charger_exists) {
605 acpi_ac_get_present(sbs);
606 if (sbs->charger_present != saved_charger_state)
607 kobject_uevent(&sbs->charger->dev.kobj, KOBJ_CHANGE);
608 }
609
610 if (sbs->manager_present) {
611 for (id = 0; id < MAX_SBS_BAT; ++id) {
612 if (!(sbs->batteries_supported & (1 << id)))
613 continue;
614 bat = &sbs->battery[id];
615 saved_battery_state = bat->present;
616 acpi_battery_read(bat);
617 if (saved_battery_state == bat->present)
618 continue;
619 kobject_uevent(&bat->bat->dev.kobj, KOBJ_CHANGE);
620 }
621 }
622}
623
624static int acpi_sbs_add(struct acpi_device *device)
625{
626 struct acpi_sbs *sbs;
627 int result = 0;
628 int id;
629
630 sbs = kzalloc(sizeof(struct acpi_sbs), GFP_KERNEL);
631 if (!sbs) {
632 result = -ENOMEM;
633 goto end;
634 }
635
636 mutex_init(&sbs->lock);
637
638 sbs->hc = acpi_driver_data(device->parent);
639 sbs->device = device;
640 strcpy(acpi_device_name(device), ACPI_SBS_DEVICE_NAME);
641 strcpy(acpi_device_class(device), ACPI_SBS_CLASS);
642 device->driver_data = sbs;
643
644 result = acpi_charger_add(sbs);
645 if (result && result != -ENODEV)
646 goto end;
647
648 result = 0;
649
650 if (!x86_apple_machine) {
651 result = acpi_manager_get_info(sbs);
652 if (!result) {
653 sbs->manager_present = 1;
654 for (id = 0; id < MAX_SBS_BAT; ++id)
655 if ((sbs->batteries_supported & (1 << id)))
656 acpi_battery_add(sbs, id);
657 }
658 }
659
660 if (!sbs->manager_present)
661 acpi_battery_add(sbs, 0);
662
663 acpi_smbus_register_callback(sbs->hc, acpi_sbs_callback, sbs);
664 end:
665 if (result)
666 acpi_sbs_remove(device);
667 return result;
668}
669
670static int acpi_sbs_remove(struct acpi_device *device)
671{
672 struct acpi_sbs *sbs;
673 int id;
674
675 if (!device)
676 return -EINVAL;
677 sbs = acpi_driver_data(device);
678 if (!sbs)
679 return -EINVAL;
680 mutex_lock(&sbs->lock);
681 acpi_smbus_unregister_callback(sbs->hc);
682 for (id = 0; id < MAX_SBS_BAT; ++id)
683 acpi_battery_remove(sbs, id);
684 acpi_charger_remove(sbs);
685 mutex_unlock(&sbs->lock);
686 mutex_destroy(&sbs->lock);
687 kfree(sbs);
688 return 0;
689}
690
691#ifdef CONFIG_PM_SLEEP
692static int acpi_sbs_resume(struct device *dev)
693{
694 struct acpi_sbs *sbs;
695 if (!dev)
696 return -EINVAL;
697 sbs = to_acpi_device(dev)->driver_data;
698 acpi_sbs_callback(sbs);
699 return 0;
700}
701#else
702#define acpi_sbs_resume NULL
703#endif
704
705static SIMPLE_DEV_PM_OPS(acpi_sbs_pm, NULL, acpi_sbs_resume);
706
707static struct acpi_driver acpi_sbs_driver = {
708 .name = "sbs",
709 .class = ACPI_SBS_CLASS,
710 .ids = sbs_device_ids,
711 .ops = {
712 .add = acpi_sbs_add,
713 .remove = acpi_sbs_remove,
714 },
715 .drv.pm = &acpi_sbs_pm,
716};
717
718static int __init acpi_sbs_init(void)
719{
720 int result = 0;
721
722 if (acpi_disabled)
723 return -ENODEV;
724
725 result = acpi_bus_register_driver(&acpi_sbs_driver);
726 if (result < 0)
727 return -ENODEV;
728
729 return 0;
730}
731
732static void __exit acpi_sbs_exit(void)
733{
734 acpi_bus_unregister_driver(&acpi_sbs_driver);
735 return;
736}
737
738module_init(acpi_sbs_init);
739module_exit(acpi_sbs_exit);