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sbs.c
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1 /*
2  * sbs.c - ACPI Smart Battery System Driver ($Revision: 2.0 $)
3  *
4  * Copyright (c) 2007 Alexey Starikovskiy <[email protected]>
5  * Copyright (c) 2005-2007 Vladimir Lebedev <[email protected]>
6  * Copyright (c) 2005 Rich Townsend <[email protected]>
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 
62 MODULE_AUTHOR("Alexey Starikovskiy <[email protected]>");
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  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 
117 struct 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 
133 static int acpi_sbs_remove(struct acpi_device *device, int type);
134 static int acpi_battery_get_state(struct acpi_battery *battery);
135 
136 static inline int battery_scale(int log)
137 {
138  int scale = 1;
139  while (log--)
140  scale *= 10;
141  return scale;
142 }
143 
144 static inline int acpi_battery_vscale(struct acpi_battery *battery)
145 {
146  return battery_scale((battery->spec & 0x0f00) >> 8);
147 }
148 
149 static inline int acpi_battery_ipscale(struct acpi_battery *battery)
150 {
151  return battery_scale((battery->spec & 0xf000) >> 12);
152 }
153 
154 static inline int acpi_battery_mode(struct acpi_battery *battery)
155 {
156  return (battery->mode & 0x8000);
157 }
158 
159 static 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 
165 static 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 
180 static 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 
193 static 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 
278 static enum power_supply_property sbs_ac_props[] = {
279  POWER_SUPPLY_PROP_ONLINE,
280 };
281 
282 static 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 
300 static 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 
324 struct 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 
330 static 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 
344 static 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 
354 static 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 
366 static 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 
383 static 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 
406 static 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 
413 static 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 
442 static 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 
454 static 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 
464 static 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 
478 static 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 */
490 static int
491 acpi_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 
524 static void
525 acpi_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 */
538 static struct proc_dir_entry *acpi_battery_dir = NULL;
539 
540 static inline char *acpi_battery_units(struct acpi_battery *battery)
541 {
542  return acpi_battery_mode(battery) ? " mW" : " mA";
543 }
544 
545 
546 static 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 
585 static 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 
590 static 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 
624 static 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 
629 static 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 
656 static ssize_t
657 acpi_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 
689 static 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 
694 static 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 
702 static 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 
710 static 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 
721 static struct proc_dir_entry *acpi_ac_dir = NULL;
722 
723 static 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 
737 static 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 
742 static 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  -------------------------------------------------------------------------- */
755 static 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 */
785 static 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 
829 static 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 
844 static 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 
871 static 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 
881 static 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 
917 static 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 
956 static 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 
977 static 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 
991 #ifdef CONFIG_PM_SLEEP
992 static int acpi_sbs_resume(struct device *dev)
993 {
994  struct acpi_sbs *sbs;
995  if (!dev)
996  return -EINVAL;
997  sbs = to_acpi_device(dev)->driver_data;
998  acpi_sbs_callback(sbs);
999  return 0;
1000 }
1001 #endif
1002 
1003 static SIMPLE_DEV_PM_OPS(acpi_sbs_pm, NULL, acpi_sbs_resume);
1004 
1005 static struct acpi_driver acpi_sbs_driver = {
1006  .name = "sbs",
1007  .class = ACPI_SBS_CLASS,
1008  .ids = sbs_device_ids,
1009  .ops = {
1010  .add = acpi_sbs_add,
1011  .remove = acpi_sbs_remove,
1012  },
1013  .drv.pm = &acpi_sbs_pm,
1014 };
1015 
1016 static int __init acpi_sbs_init(void)
1017 {
1018  int result = 0;
1019 
1020  if (acpi_disabled)
1021  return -ENODEV;
1022 #ifdef CONFIG_ACPI_PROCFS_POWER
1023  acpi_ac_dir = acpi_lock_ac_dir();
1024  if (!acpi_ac_dir)
1025  return -ENODEV;
1026  acpi_battery_dir = acpi_lock_battery_dir();
1027  if (!acpi_battery_dir) {
1028  acpi_sbs_rmdirs();
1029  return -ENODEV;
1030  }
1031 #endif
1032  result = acpi_bus_register_driver(&acpi_sbs_driver);
1033  if (result < 0) {
1034  acpi_sbs_rmdirs();
1035  return -ENODEV;
1036  }
1037  return 0;
1038 }
1039 
1040 static void __exit acpi_sbs_exit(void)
1041 {
1042  acpi_bus_unregister_driver(&acpi_sbs_driver);
1043  acpi_sbs_rmdirs();
1044  return;
1045 }
1046 
1047 module_init(acpi_sbs_init);
1048 module_exit(acpi_sbs_exit);
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