6050ce4818731fd2bcf8c6891d5a343414d0133a
[linux-2.6.git] / drivers / acpi / sbs.c
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/module.h>
29 #include <linux/moduleparam.h>
30 #include <linux/kernel.h>
31
32 #ifdef CONFIG_ACPI_PROCFS_POWER
33 #include <linux/proc_fs.h>
34 #include <linux/seq_file.h>
35 #include <asm/uaccess.h>
36 #endif
37
38 #include <linux/acpi.h>
39 #include <linux/timer.h>
40 #include <linux/jiffies.h>
41 #include <linux/delay.h>
42
43 #ifdef CONFIG_ACPI_SYSFS_POWER
44 #include <linux/power_supply.h>
45 #endif
46
47 #include "sbshc.h"
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
62 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
63 MODULE_DESCRIPTION("Smart Battery System ACPI interface driver");
64 MODULE_LICENSE("GPL");
65
66 static unsigned int cache_time = 1000;
67 module_param(cache_time, uint, 0644);
68 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
69
70 extern struct proc_dir_entry *acpi_lock_ac_dir(void);
71 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
72 extern void acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
73 extern 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
78 static const struct acpi_device_id sbs_device_ids[] = {
79         {"ACPI0002", 0},
80         {"", 0},
81 };
82 MODULE_DEVICE_TABLE(acpi, sbs_device_ids);
83
84 struct acpi_battery {
85 #ifdef CONFIG_ACPI_SYSFS_POWER
86         struct power_supply bat;
87 #endif
88         struct acpi_sbs *sbs;
89 #ifdef CONFIG_ACPI_PROCFS_POWER
90         struct proc_dir_entry *proc_entry;
91 #endif
92         unsigned long update_time;
93         char name[8];
94         char manufacturer_name[ACPI_SBS_BLOCK_MAX];
95         char device_name[ACPI_SBS_BLOCK_MAX];
96         char device_chemistry[ACPI_SBS_BLOCK_MAX];
97         u16 alarm_capacity;
98         u16 full_charge_capacity;
99         u16 design_capacity;
100         u16 design_voltage;
101         u16 serial_number;
102         u16 cycle_count;
103         u16 temp_now;
104         u16 voltage_now;
105         s16 current_now;
106         s16 current_avg;
107         u16 capacity_now;
108         u16 state_of_charge;
109         u16 state;
110         u16 mode;
111         u16 spec;
112         u8 id;
113         u8 present:1;
114         u8 have_sysfs_alarm:1;
115 };
116
117 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
118
119 struct acpi_sbs {
120 #ifdef CONFIG_ACPI_SYSFS_POWER
121         struct power_supply charger;
122 #endif
123         struct acpi_device *device;
124         struct acpi_smb_hc *hc;
125         struct mutex lock;
126 #ifdef CONFIG_ACPI_PROCFS_POWER
127         struct proc_dir_entry *charger_entry;
128 #endif
129         struct acpi_battery battery[MAX_SBS_BAT];
130         u8 batteries_supported:4;
131         u8 manager_present:1;
132         u8 charger_present:1;
133 };
134
135 #define to_acpi_sbs(x) container_of(x, struct acpi_sbs, charger)
136
137 static inline int battery_scale(int log)
138 {
139         int scale = 1;
140         while (log--)
141                 scale *= 10;
142         return scale;
143 }
144
145 static inline int acpi_battery_vscale(struct acpi_battery *battery)
146 {
147         return battery_scale((battery->spec & 0x0f00) >> 8);
148 }
149
150 static inline int acpi_battery_ipscale(struct acpi_battery *battery)
151 {
152         return battery_scale((battery->spec & 0xf000) >> 12);
153 }
154
155 static inline int acpi_battery_mode(struct acpi_battery *battery)
156 {
157         return (battery->mode & 0x8000);
158 }
159
160 static inline int acpi_battery_scale(struct acpi_battery *battery)
161 {
162         return (acpi_battery_mode(battery) ? 10 : 1) *
163             acpi_battery_ipscale(battery);
164 }
165
166 #ifdef CONFIG_ACPI_SYSFS_POWER
167 static int sbs_get_ac_property(struct power_supply *psy,
168                                enum power_supply_property psp,
169                                union power_supply_propval *val)
170 {
171         struct acpi_sbs *sbs = to_acpi_sbs(psy);
172         switch (psp) {
173         case POWER_SUPPLY_PROP_ONLINE:
174                 val->intval = sbs->charger_present;
175                 break;
176         default:
177                 return -EINVAL;
178         }
179         return 0;
180 }
181
182 static int acpi_battery_technology(struct acpi_battery *battery)
183 {
184         if (!strcasecmp("NiCd", battery->device_chemistry))
185                 return POWER_SUPPLY_TECHNOLOGY_NiCd;
186         if (!strcasecmp("NiMH", battery->device_chemistry))
187                 return POWER_SUPPLY_TECHNOLOGY_NiMH;
188         if (!strcasecmp("LION", battery->device_chemistry))
189                 return POWER_SUPPLY_TECHNOLOGY_LION;
190         if (!strcasecmp("LiP", battery->device_chemistry))
191                 return POWER_SUPPLY_TECHNOLOGY_LIPO;
192         return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
193 }
194
195 static int acpi_sbs_battery_get_property(struct power_supply *psy,
196                                          enum power_supply_property psp,
197                                          union power_supply_propval *val)
198 {
199         struct acpi_battery *battery = to_acpi_battery(psy);
200
201         if ((!battery->present) && psp != POWER_SUPPLY_PROP_PRESENT)
202                 return -ENODEV;
203         switch (psp) {
204         case POWER_SUPPLY_PROP_STATUS:
205                 if (battery->current_now < 0)
206                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
207                 else if (battery->current_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_VOLTAGE_MIN_DESIGN:
219                 val->intval = battery->design_voltage *
220                         acpi_battery_vscale(battery) * 1000;
221                 break;
222         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
223                 val->intval = battery->voltage_now *
224                                 acpi_battery_vscale(battery) * 1000;
225                 break;
226         case POWER_SUPPLY_PROP_CURRENT_NOW:
227                 val->intval = abs(battery->current_now) *
228                                 acpi_battery_ipscale(battery) * 1000;
229                 break;
230         case POWER_SUPPLY_PROP_CURRENT_AVG:
231                 val->intval = abs(battery->current_avg) *
232                                 acpi_battery_ipscale(battery) * 1000;
233                 break;
234         case POWER_SUPPLY_PROP_CAPACITY:
235                 val->intval = battery->state_of_charge;
236                 break;
237         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
238         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
239                 val->intval = battery->design_capacity *
240                         acpi_battery_scale(battery) * 1000;
241                 break;
242         case POWER_SUPPLY_PROP_CHARGE_FULL:
243         case POWER_SUPPLY_PROP_ENERGY_FULL:
244                 val->intval = battery->full_charge_capacity *
245                         acpi_battery_scale(battery) * 1000;
246                 break;
247         case POWER_SUPPLY_PROP_CHARGE_NOW:
248         case POWER_SUPPLY_PROP_ENERGY_NOW:
249                 val->intval = battery->capacity_now *
250                                 acpi_battery_scale(battery) * 1000;
251                 break;
252         case POWER_SUPPLY_PROP_TEMP:
253                 val->intval = battery->temp_now - 2730; // dK -> dC
254                 break;
255         case POWER_SUPPLY_PROP_MODEL_NAME:
256                 val->strval = battery->device_name;
257                 break;
258         case POWER_SUPPLY_PROP_MANUFACTURER:
259                 val->strval = battery->manufacturer_name;
260                 break;
261         default:
262                 return -EINVAL;
263         }
264         return 0;
265 }
266
267 static enum power_supply_property sbs_ac_props[] = {
268         POWER_SUPPLY_PROP_ONLINE,
269 };
270
271 static enum power_supply_property sbs_charge_battery_props[] = {
272         POWER_SUPPLY_PROP_STATUS,
273         POWER_SUPPLY_PROP_PRESENT,
274         POWER_SUPPLY_PROP_TECHNOLOGY,
275         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
276         POWER_SUPPLY_PROP_VOLTAGE_NOW,
277         POWER_SUPPLY_PROP_CURRENT_NOW,
278         POWER_SUPPLY_PROP_CURRENT_AVG,
279         POWER_SUPPLY_PROP_CAPACITY,
280         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
281         POWER_SUPPLY_PROP_CHARGE_FULL,
282         POWER_SUPPLY_PROP_CHARGE_NOW,
283         POWER_SUPPLY_PROP_TEMP,
284         POWER_SUPPLY_PROP_MODEL_NAME,
285         POWER_SUPPLY_PROP_MANUFACTURER,
286 };
287
288 static enum power_supply_property sbs_energy_battery_props[] = {
289         POWER_SUPPLY_PROP_STATUS,
290         POWER_SUPPLY_PROP_PRESENT,
291         POWER_SUPPLY_PROP_TECHNOLOGY,
292         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
293         POWER_SUPPLY_PROP_VOLTAGE_NOW,
294         POWER_SUPPLY_PROP_CURRENT_NOW,
295         POWER_SUPPLY_PROP_CURRENT_AVG,
296         POWER_SUPPLY_PROP_CAPACITY,
297         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
298         POWER_SUPPLY_PROP_ENERGY_FULL,
299         POWER_SUPPLY_PROP_ENERGY_NOW,
300         POWER_SUPPLY_PROP_TEMP,
301         POWER_SUPPLY_PROP_MODEL_NAME,
302         POWER_SUPPLY_PROP_MANUFACTURER,
303 };
304 #endif
305
306 /* --------------------------------------------------------------------------
307                             Smart Battery System Management
308    -------------------------------------------------------------------------- */
309
310 struct acpi_battery_reader {
311         u8 command;             /* command for battery */
312         u8 mode;                /* word or block? */
313         size_t offset;          /* offset inside struct acpi_sbs_battery */
314 };
315
316 static struct acpi_battery_reader info_readers[] = {
317         {0x01, SMBUS_READ_WORD, offsetof(struct acpi_battery, alarm_capacity)},
318         {0x03, SMBUS_READ_WORD, offsetof(struct acpi_battery, mode)},
319         {0x10, SMBUS_READ_WORD, offsetof(struct acpi_battery, full_charge_capacity)},
320         {0x17, SMBUS_READ_WORD, offsetof(struct acpi_battery, cycle_count)},
321         {0x18, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_capacity)},
322         {0x19, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_voltage)},
323         {0x1a, SMBUS_READ_WORD, offsetof(struct acpi_battery, spec)},
324         {0x1c, SMBUS_READ_WORD, offsetof(struct acpi_battery, serial_number)},
325         {0x20, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, manufacturer_name)},
326         {0x21, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_name)},
327         {0x22, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_chemistry)},
328 };
329
330 static struct acpi_battery_reader state_readers[] = {
331         {0x08, SMBUS_READ_WORD, offsetof(struct acpi_battery, temp_now)},
332         {0x09, SMBUS_READ_WORD, offsetof(struct acpi_battery, voltage_now)},
333         {0x0a, SMBUS_READ_WORD, offsetof(struct acpi_battery, current_now)},
334         {0x0b, SMBUS_READ_WORD, offsetof(struct acpi_battery, current_avg)},
335         {0x0f, SMBUS_READ_WORD, offsetof(struct acpi_battery, capacity_now)},
336         {0x0e, SMBUS_READ_WORD, offsetof(struct acpi_battery, state_of_charge)},
337         {0x16, SMBUS_READ_WORD, offsetof(struct acpi_battery, state)},
338 };
339
340 static int acpi_manager_get_info(struct acpi_sbs *sbs)
341 {
342         int result = 0;
343         u16 battery_system_info;
344
345         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
346                                  0x04, (u8 *)&battery_system_info);
347         if (!result)
348                 sbs->batteries_supported = battery_system_info & 0x000f;
349         return result;
350 }
351
352 static int acpi_battery_get_info(struct acpi_battery *battery)
353 {
354         int i, result = 0;
355
356         for (i = 0; i < ARRAY_SIZE(info_readers); ++i) {
357                 result = acpi_smbus_read(battery->sbs->hc,
358                                          info_readers[i].mode,
359                                          ACPI_SBS_BATTERY,
360                                          info_readers[i].command,
361                                          (u8 *) battery +
362                                                 info_readers[i].offset);
363                 if (result)
364                         break;
365         }
366         return result;
367 }
368
369 static int acpi_battery_get_state(struct acpi_battery *battery)
370 {
371         int i, result = 0;
372
373         if (battery->update_time &&
374             time_before(jiffies, battery->update_time +
375                                 msecs_to_jiffies(cache_time)))
376                 return 0;
377         for (i = 0; i < ARRAY_SIZE(state_readers); ++i) {
378                 result = acpi_smbus_read(battery->sbs->hc,
379                                          state_readers[i].mode,
380                                          ACPI_SBS_BATTERY,
381                                          state_readers[i].command,
382                                          (u8 *)battery +
383                                                 state_readers[i].offset);
384                 if (result)
385                         goto end;
386         }
387       end:
388         battery->update_time = jiffies;
389         return result;
390 }
391
392 static int acpi_battery_get_alarm(struct acpi_battery *battery)
393 {
394         return acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
395                                  ACPI_SBS_BATTERY, 0x01,
396                                  (u8 *)&battery->alarm_capacity);
397 }
398
399 static int acpi_battery_set_alarm(struct acpi_battery *battery)
400 {
401         struct acpi_sbs *sbs = battery->sbs;
402         u16 value, sel = 1 << (battery->id + 12);
403
404         int ret;
405
406
407         if (sbs->manager_present) {
408                 ret = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
409                                 0x01, (u8 *)&value);
410                 if (ret)
411                         goto end;
412                 if ((value & 0xf000) != sel) {
413                         value &= 0x0fff;
414                         value |= sel;
415                 ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD,
416                                          ACPI_SBS_MANAGER,
417                                          0x01, (u8 *)&value, 2);
418                 if (ret)
419                         goto end;
420                 }
421         }
422         ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD, ACPI_SBS_BATTERY,
423                                 0x01, (u8 *)&battery->alarm_capacity, 2);
424       end:
425         return ret;
426 }
427
428 static int acpi_ac_get_present(struct acpi_sbs *sbs)
429 {
430         int result;
431         u16 status;
432
433         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_CHARGER,
434                                  0x13, (u8 *) & status);
435         if (!result)
436                 sbs->charger_present = (status >> 15) & 0x1;
437         return result;
438 }
439
440 #ifdef CONFIG_ACPI_SYSFS_POWER
441 static ssize_t acpi_battery_alarm_show(struct device *dev,
442                                         struct device_attribute *attr,
443                                         char *buf)
444 {
445         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
446         acpi_battery_get_alarm(battery);
447         return sprintf(buf, "%d\n", battery->alarm_capacity *
448                                 acpi_battery_scale(battery) * 1000);
449 }
450
451 static ssize_t acpi_battery_alarm_store(struct device *dev,
452                                         struct device_attribute *attr,
453                                         const char *buf, size_t count)
454 {
455         unsigned long x;
456         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
457         if (sscanf(buf, "%ld\n", &x) == 1)
458                 battery->alarm_capacity = x /
459                         (1000 * acpi_battery_scale(battery));
460         if (battery->present)
461                 acpi_battery_set_alarm(battery);
462         return count;
463 }
464
465 static struct device_attribute alarm_attr = {
466         .attr = {.name = "alarm", .mode = 0644},
467         .show = acpi_battery_alarm_show,
468         .store = acpi_battery_alarm_store,
469 };
470 #endif
471
472 /* --------------------------------------------------------------------------
473                               FS Interface (/proc/acpi)
474    -------------------------------------------------------------------------- */
475
476 #ifdef CONFIG_ACPI_PROCFS_POWER
477 /* Generic Routines */
478 static int
479 acpi_sbs_add_fs(struct proc_dir_entry **dir,
480                 struct proc_dir_entry *parent_dir,
481                 char *dir_name,
482                 struct file_operations *info_fops,
483                 struct file_operations *state_fops,
484                 struct file_operations *alarm_fops, void *data)
485 {
486         if (!*dir) {
487                 *dir = proc_mkdir(dir_name, parent_dir);
488                 if (!*dir) {
489                         return -ENODEV;
490                 }
491                 (*dir)->owner = THIS_MODULE;
492         }
493
494         /* 'info' [R] */
495         if (info_fops)
496                 proc_create_data(ACPI_SBS_FILE_INFO, S_IRUGO, *dir,
497                                  info_fops, data);
498
499         /* 'state' [R] */
500         if (state_fops)
501                 proc_create_data(ACPI_SBS_FILE_STATE, S_IRUGO, *dir,
502                                  state_fops, data);
503
504         /* 'alarm' [R/W] */
505         if (alarm_fops)
506                 proc_create_data(ACPI_SBS_FILE_ALARM, S_IRUGO, *dir,
507                                  alarm_fops, data);
508         return 0;
509 }
510
511 static void
512 acpi_sbs_remove_fs(struct proc_dir_entry **dir,
513                            struct proc_dir_entry *parent_dir)
514 {
515         if (*dir) {
516                 remove_proc_entry(ACPI_SBS_FILE_INFO, *dir);
517                 remove_proc_entry(ACPI_SBS_FILE_STATE, *dir);
518                 remove_proc_entry(ACPI_SBS_FILE_ALARM, *dir);
519                 remove_proc_entry((*dir)->name, parent_dir);
520                 *dir = NULL;
521         }
522 }
523
524 /* Smart Battery Interface */
525 static struct proc_dir_entry *acpi_battery_dir = NULL;
526
527 static inline char *acpi_battery_units(struct acpi_battery *battery)
528 {
529         return acpi_battery_mode(battery) ? " mW" : " mA";
530 }
531
532
533 static int acpi_battery_read_info(struct seq_file *seq, void *offset)
534 {
535         struct acpi_battery *battery = seq->private;
536         struct acpi_sbs *sbs = battery->sbs;
537         int result = 0;
538
539         mutex_lock(&sbs->lock);
540
541         seq_printf(seq, "present:                 %s\n",
542                    (battery->present) ? "yes" : "no");
543         if (!battery->present)
544                 goto end;
545
546         seq_printf(seq, "design capacity:         %i%sh\n",
547                    battery->design_capacity * acpi_battery_scale(battery),
548                    acpi_battery_units(battery));
549         seq_printf(seq, "last full capacity:      %i%sh\n",
550                    battery->full_charge_capacity * acpi_battery_scale(battery),
551                    acpi_battery_units(battery));
552         seq_printf(seq, "battery technology:      rechargeable\n");
553         seq_printf(seq, "design voltage:          %i mV\n",
554                    battery->design_voltage * acpi_battery_vscale(battery));
555         seq_printf(seq, "design capacity warning: unknown\n");
556         seq_printf(seq, "design capacity low:     unknown\n");
557         seq_printf(seq, "capacity granularity 1:  unknown\n");
558         seq_printf(seq, "capacity granularity 2:  unknown\n");
559         seq_printf(seq, "model number:            %s\n", battery->device_name);
560         seq_printf(seq, "serial number:           %i\n",
561                    battery->serial_number);
562         seq_printf(seq, "battery type:            %s\n",
563                    battery->device_chemistry);
564         seq_printf(seq, "OEM info:                %s\n",
565                    battery->manufacturer_name);
566       end:
567         mutex_unlock(&sbs->lock);
568         return result;
569 }
570
571 static int acpi_battery_info_open_fs(struct inode *inode, struct file *file)
572 {
573         return single_open(file, acpi_battery_read_info, PDE(inode)->data);
574 }
575
576 static int acpi_battery_read_state(struct seq_file *seq, void *offset)
577 {
578         struct acpi_battery *battery = seq->private;
579         struct acpi_sbs *sbs = battery->sbs;
580         int rate;
581
582         mutex_lock(&sbs->lock);
583         seq_printf(seq, "present:                 %s\n",
584                    (battery->present) ? "yes" : "no");
585         if (!battery->present)
586                 goto end;
587
588         acpi_battery_get_state(battery);
589         seq_printf(seq, "capacity state:          %s\n",
590                    (battery->state & 0x0010) ? "critical" : "ok");
591         seq_printf(seq, "charging state:          %s\n",
592                    (battery->current_now < 0) ? "discharging" :
593                    ((battery->current_now > 0) ? "charging" : "charged"));
594         rate = abs(battery->current_now) * acpi_battery_ipscale(battery);
595         rate *= (acpi_battery_mode(battery))?(battery->voltage_now *
596                         acpi_battery_vscale(battery)/1000):1;
597         seq_printf(seq, "present rate:            %d%s\n", rate,
598                    acpi_battery_units(battery));
599         seq_printf(seq, "remaining capacity:      %i%sh\n",
600                    battery->capacity_now * acpi_battery_scale(battery),
601                    acpi_battery_units(battery));
602         seq_printf(seq, "present voltage:         %i mV\n",
603                    battery->voltage_now * acpi_battery_vscale(battery));
604
605       end:
606         mutex_unlock(&sbs->lock);
607         return 0;
608 }
609
610 static int acpi_battery_state_open_fs(struct inode *inode, struct file *file)
611 {
612         return single_open(file, acpi_battery_read_state, PDE(inode)->data);
613 }
614
615 static int acpi_battery_read_alarm(struct seq_file *seq, void *offset)
616 {
617         struct acpi_battery *battery = seq->private;
618         struct acpi_sbs *sbs = battery->sbs;
619         int result = 0;
620
621         mutex_lock(&sbs->lock);
622
623         if (!battery->present) {
624                 seq_printf(seq, "present:                 no\n");
625                 goto end;
626         }
627
628         acpi_battery_get_alarm(battery);
629         seq_printf(seq, "alarm:                   ");
630         if (battery->alarm_capacity)
631                 seq_printf(seq, "%i%sh\n",
632                            battery->alarm_capacity *
633                            acpi_battery_scale(battery),
634                            acpi_battery_units(battery));
635         else
636                 seq_printf(seq, "disabled\n");
637       end:
638         mutex_unlock(&sbs->lock);
639         return result;
640 }
641
642 static ssize_t
643 acpi_battery_write_alarm(struct file *file, const char __user * buffer,
644                          size_t count, loff_t * ppos)
645 {
646         struct seq_file *seq = file->private_data;
647         struct acpi_battery *battery = seq->private;
648         struct acpi_sbs *sbs = battery->sbs;
649         char alarm_string[12] = { '\0' };
650         int result = 0;
651         mutex_lock(&sbs->lock);
652         if (!battery->present) {
653                 result = -ENODEV;
654                 goto end;
655         }
656         if (count > sizeof(alarm_string) - 1) {
657                 result = -EINVAL;
658                 goto end;
659         }
660         if (copy_from_user(alarm_string, buffer, count)) {
661                 result = -EFAULT;
662                 goto end;
663         }
664         alarm_string[count] = 0;
665         battery->alarm_capacity = simple_strtoul(alarm_string, NULL, 0) /
666                                         acpi_battery_scale(battery);
667         acpi_battery_set_alarm(battery);
668       end:
669         mutex_unlock(&sbs->lock);
670         if (result)
671                 return result;
672         return count;
673 }
674
675 static int acpi_battery_alarm_open_fs(struct inode *inode, struct file *file)
676 {
677         return single_open(file, acpi_battery_read_alarm, PDE(inode)->data);
678 }
679
680 static struct file_operations acpi_battery_info_fops = {
681         .open = acpi_battery_info_open_fs,
682         .read = seq_read,
683         .llseek = seq_lseek,
684         .release = single_release,
685         .owner = THIS_MODULE,
686 };
687
688 static struct file_operations acpi_battery_state_fops = {
689         .open = acpi_battery_state_open_fs,
690         .read = seq_read,
691         .llseek = seq_lseek,
692         .release = single_release,
693         .owner = THIS_MODULE,
694 };
695
696 static struct file_operations acpi_battery_alarm_fops = {
697         .open = acpi_battery_alarm_open_fs,
698         .read = seq_read,
699         .write = acpi_battery_write_alarm,
700         .llseek = seq_lseek,
701         .release = single_release,
702         .owner = THIS_MODULE,
703 };
704
705 /* Legacy AC Adapter Interface */
706
707 static struct proc_dir_entry *acpi_ac_dir = NULL;
708
709 static int acpi_ac_read_state(struct seq_file *seq, void *offset)
710 {
711
712         struct acpi_sbs *sbs = seq->private;
713
714         mutex_lock(&sbs->lock);
715
716         seq_printf(seq, "state:                   %s\n",
717                    sbs->charger_present ? "on-line" : "off-line");
718
719         mutex_unlock(&sbs->lock);
720         return 0;
721 }
722
723 static int acpi_ac_state_open_fs(struct inode *inode, struct file *file)
724 {
725         return single_open(file, acpi_ac_read_state, PDE(inode)->data);
726 }
727
728 static struct file_operations acpi_ac_state_fops = {
729         .open = acpi_ac_state_open_fs,
730         .read = seq_read,
731         .llseek = seq_lseek,
732         .release = single_release,
733         .owner = THIS_MODULE,
734 };
735
736 #endif
737
738 /* --------------------------------------------------------------------------
739                                  Driver Interface
740    -------------------------------------------------------------------------- */
741 static int acpi_battery_read(struct acpi_battery *battery)
742 {
743         int result = 0, saved_present = battery->present;
744         u16 state;
745
746         if (battery->sbs->manager_present) {
747                 result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
748                                 ACPI_SBS_MANAGER, 0x01, (u8 *)&state);
749                 if (!result)
750                         battery->present = state & (1 << battery->id);
751                 state &= 0x0fff;
752                 state |= 1 << (battery->id + 12);
753                 acpi_smbus_write(battery->sbs->hc, SMBUS_WRITE_WORD,
754                                   ACPI_SBS_MANAGER, 0x01, (u8 *)&state, 2);
755         } else if (battery->id == 0)
756                 battery->present = 1;
757         if (result || !battery->present)
758                 return result;
759
760         if (saved_present != battery->present) {
761                 battery->update_time = 0;
762                 result = acpi_battery_get_info(battery);
763                 if (result)
764                         return result;
765         }
766         result = acpi_battery_get_state(battery);
767         return result;
768 }
769
770 /* Smart Battery */
771 static int acpi_battery_add(struct acpi_sbs *sbs, int id)
772 {
773         struct acpi_battery *battery = &sbs->battery[id];
774         int result;
775
776         battery->id = id;
777         battery->sbs = sbs;
778         result = acpi_battery_read(battery);
779         if (result)
780                 return result;
781
782         sprintf(battery->name, ACPI_BATTERY_DIR_NAME, id);
783 #ifdef CONFIG_ACPI_PROCFS_POWER
784         acpi_sbs_add_fs(&battery->proc_entry, acpi_battery_dir,
785                         battery->name, &acpi_battery_info_fops,
786                         &acpi_battery_state_fops, &acpi_battery_alarm_fops,
787                         battery);
788 #endif
789 #ifdef CONFIG_ACPI_SYSFS_POWER
790         battery->bat.name = battery->name;
791         battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
792         if (!acpi_battery_mode(battery)) {
793                 battery->bat.properties = sbs_charge_battery_props;
794                 battery->bat.num_properties =
795                     ARRAY_SIZE(sbs_charge_battery_props);
796         } else {
797                 battery->bat.properties = sbs_energy_battery_props;
798                 battery->bat.num_properties =
799                     ARRAY_SIZE(sbs_energy_battery_props);
800         }
801         battery->bat.get_property = acpi_sbs_battery_get_property;
802         result = power_supply_register(&sbs->device->dev, &battery->bat);
803         if (result)
804                 goto end;
805         result = device_create_file(battery->bat.dev, &alarm_attr);
806         if (result)
807                 goto end;
808         battery->have_sysfs_alarm = 1;
809       end:
810 #endif
811         printk(KERN_INFO PREFIX "%s [%s]: Battery Slot [%s] (battery %s)\n",
812                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
813                battery->name, battery->present ? "present" : "absent");
814         return result;
815 }
816
817 static void acpi_battery_remove(struct acpi_sbs *sbs, int id)
818 {
819         struct acpi_battery *battery = &sbs->battery[id];
820 #ifdef CONFIG_ACPI_SYSFS_POWER
821         if (battery->bat.dev) {
822                 if (battery->have_sysfs_alarm)
823                         device_remove_file(battery->bat.dev, &alarm_attr);
824                 power_supply_unregister(&battery->bat);
825         }
826 #endif
827 #ifdef CONFIG_ACPI_PROCFS_POWER
828         if (battery->proc_entry)
829                 acpi_sbs_remove_fs(&battery->proc_entry, acpi_battery_dir);
830 #endif
831 }
832
833 static int acpi_charger_add(struct acpi_sbs *sbs)
834 {
835         int result;
836
837         result = acpi_ac_get_present(sbs);
838         if (result)
839                 goto end;
840 #ifdef CONFIG_ACPI_PROCFS_POWER
841         result = acpi_sbs_add_fs(&sbs->charger_entry, acpi_ac_dir,
842                                  ACPI_AC_DIR_NAME, NULL,
843                                  &acpi_ac_state_fops, NULL, sbs);
844         if (result)
845                 goto end;
846 #endif
847 #ifdef CONFIG_ACPI_SYSFS_POWER
848         sbs->charger.name = "sbs-charger";
849         sbs->charger.type = POWER_SUPPLY_TYPE_MAINS;
850         sbs->charger.properties = sbs_ac_props;
851         sbs->charger.num_properties = ARRAY_SIZE(sbs_ac_props);
852         sbs->charger.get_property = sbs_get_ac_property;
853         power_supply_register(&sbs->device->dev, &sbs->charger);
854 #endif
855         printk(KERN_INFO PREFIX "%s [%s]: AC Adapter [%s] (%s)\n",
856                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
857                ACPI_AC_DIR_NAME, sbs->charger_present ? "on-line" : "off-line");
858       end:
859         return result;
860 }
861
862 static void acpi_charger_remove(struct acpi_sbs *sbs)
863 {
864 #ifdef CONFIG_ACPI_SYSFS_POWER
865         if (sbs->charger.dev)
866                 power_supply_unregister(&sbs->charger);
867 #endif
868 #ifdef CONFIG_ACPI_PROCFS_POWER
869         if (sbs->charger_entry)
870                 acpi_sbs_remove_fs(&sbs->charger_entry, acpi_ac_dir);
871 #endif
872 }
873
874 static void acpi_sbs_callback(void *context)
875 {
876         int id;
877         struct acpi_sbs *sbs = context;
878         struct acpi_battery *bat;
879         u8 saved_charger_state = sbs->charger_present;
880         u8 saved_battery_state;
881         acpi_ac_get_present(sbs);
882         if (sbs->charger_present != saved_charger_state) {
883 #ifdef CONFIG_ACPI_PROC_EVENT
884                 acpi_bus_generate_proc_event4(ACPI_AC_CLASS, ACPI_AC_DIR_NAME,
885                                               ACPI_SBS_NOTIFY_STATUS,
886                                               sbs->charger_present);
887 #endif
888 #ifdef CONFIG_ACPI_SYSFS_POWER
889                 kobject_uevent(&sbs->charger.dev->kobj, KOBJ_CHANGE);
890 #endif
891         }
892         if (sbs->manager_present) {
893                 for (id = 0; id < MAX_SBS_BAT; ++id) {
894                         if (!(sbs->batteries_supported & (1 << id)))
895                                 continue;
896                         bat = &sbs->battery[id];
897                         saved_battery_state = bat->present;
898                         acpi_battery_read(bat);
899                         if (saved_battery_state == bat->present)
900                                 continue;
901 #ifdef CONFIG_ACPI_PROC_EVENT
902                         acpi_bus_generate_proc_event4(ACPI_BATTERY_CLASS,
903                                                       bat->name,
904                                                       ACPI_SBS_NOTIFY_STATUS,
905                                                       bat->present);
906 #endif
907 #ifdef CONFIG_ACPI_SYSFS_POWER
908                         kobject_uevent(&bat->bat.dev->kobj, KOBJ_CHANGE);
909 #endif
910                 }
911         }
912 }
913
914 static int acpi_sbs_remove(struct acpi_device *device, int type);
915
916 static int acpi_sbs_add(struct acpi_device *device)
917 {
918         struct acpi_sbs *sbs;
919         int result = 0;
920         int id;
921
922         sbs = kzalloc(sizeof(struct acpi_sbs), GFP_KERNEL);
923         if (!sbs) {
924                 result = -ENOMEM;
925                 goto end;
926         }
927
928         mutex_init(&sbs->lock);
929
930         sbs->hc = acpi_driver_data(device->parent);
931         sbs->device = device;
932         strcpy(acpi_device_name(device), ACPI_SBS_DEVICE_NAME);
933         strcpy(acpi_device_class(device), ACPI_SBS_CLASS);
934         device->driver_data = sbs;
935
936         result = acpi_charger_add(sbs);
937         if (result)
938                 goto end;
939
940         result = acpi_manager_get_info(sbs);
941         if (!result) {
942                 sbs->manager_present = 1;
943                 for (id = 0; id < MAX_SBS_BAT; ++id)
944                         if ((sbs->batteries_supported & (1 << id)))
945                                 acpi_battery_add(sbs, id);
946         } else
947                 acpi_battery_add(sbs, 0);
948         acpi_smbus_register_callback(sbs->hc, acpi_sbs_callback, sbs);
949       end:
950         if (result)
951                 acpi_sbs_remove(device, 0);
952         return result;
953 }
954
955 static int acpi_sbs_remove(struct acpi_device *device, int type)
956 {
957         struct acpi_sbs *sbs;
958         int id;
959
960         if (!device)
961                 return -EINVAL;
962         sbs = acpi_driver_data(device);
963         if (!sbs)
964                 return -EINVAL;
965         mutex_lock(&sbs->lock);
966         acpi_smbus_unregister_callback(sbs->hc);
967         for (id = 0; id < MAX_SBS_BAT; ++id)
968                 acpi_battery_remove(sbs, id);
969         acpi_charger_remove(sbs);
970         mutex_unlock(&sbs->lock);
971         mutex_destroy(&sbs->lock);
972         kfree(sbs);
973         return 0;
974 }
975
976 static void acpi_sbs_rmdirs(void)
977 {
978 #ifdef CONFIG_ACPI_PROCFS_POWER
979         if (acpi_ac_dir) {
980                 acpi_unlock_ac_dir(acpi_ac_dir);
981                 acpi_ac_dir = NULL;
982         }
983         if (acpi_battery_dir) {
984                 acpi_unlock_battery_dir(acpi_battery_dir);
985                 acpi_battery_dir = NULL;
986         }
987 #endif
988 }
989
990 static int acpi_sbs_resume(struct acpi_device *device)
991 {
992         struct acpi_sbs *sbs;
993         if (!device)
994                 return -EINVAL;
995         sbs = device->driver_data;
996         acpi_sbs_callback(sbs);
997         return 0;
998 }
999
1000 static struct acpi_driver acpi_sbs_driver = {
1001         .name = "sbs",
1002         .class = ACPI_SBS_CLASS,
1003         .ids = sbs_device_ids,
1004         .ops = {
1005                 .add = acpi_sbs_add,
1006                 .remove = acpi_sbs_remove,
1007                 .resume = acpi_sbs_resume,
1008                 },
1009 };
1010
1011 static int __init acpi_sbs_init(void)
1012 {
1013         int result = 0;
1014
1015         if (acpi_disabled)
1016                 return -ENODEV;
1017 #ifdef CONFIG_ACPI_PROCFS_POWER
1018         acpi_ac_dir = acpi_lock_ac_dir();
1019         if (!acpi_ac_dir)
1020                 return -ENODEV;
1021         acpi_battery_dir = acpi_lock_battery_dir();
1022         if (!acpi_battery_dir) {
1023                 acpi_sbs_rmdirs();
1024                 return -ENODEV;
1025         }
1026 #endif
1027         result = acpi_bus_register_driver(&acpi_sbs_driver);
1028         if (result < 0) {
1029                 acpi_sbs_rmdirs();
1030                 return -ENODEV;
1031         }
1032         return 0;
1033 }
1034
1035 static void __exit acpi_sbs_exit(void)
1036 {
1037         acpi_bus_unregister_driver(&acpi_sbs_driver);
1038         acpi_sbs_rmdirs();
1039         return;
1040 }
1041
1042 module_init(acpi_sbs_init);
1043 module_exit(acpi_sbs_exit);