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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/module.h>
  29 #include <linux/moduleparam.h>
  30 #include <linux/kernel.h>
  31 #include <linux/proc_fs.h>
  32 #include <linux/seq_file.h>
  33 #include <asm/uaccess.h>
  34 #include <linux/acpi.h>
  35 #include <linux/timer.h>
  36 #include <linux/jiffies.h>
  37 #include <linux/delay.h>
  38
  39 #include "sbshc.h"
  40
  41 #define ACPI_SBS_COMPONENT              0x00080000
  42 #define ACPI_SBS_CLASS                  "sbs"
  43 #define ACPI_AC_CLASS                   "ac_adapter"
  44 #define ACPI_BATTERY_CLASS              "battery"
  45 #define ACPI_SBS_DEVICE_NAME            "Smart Battery System"
  46 #define ACPI_SBS_FILE_INFO              "info"
  47 #define ACPI_SBS_FILE_STATE             "state"
  48 #define ACPI_SBS_FILE_ALARM             "alarm"
  49 #define ACPI_BATTERY_DIR_NAME           "BAT%i"
  50 #define ACPI_AC_DIR_NAME                "AC0"
  51
  52 enum acpi_sbs_device_addr {
  53         ACPI_SBS_CHARGER = 0x9,
  54         ACPI_SBS_MANAGER = 0xa,
  55         ACPI_SBS_BATTERY = 0xb,
  56 };
  57
  58 #define ACPI_SBS_NOTIFY_STATUS          0x80
  59 #define ACPI_SBS_NOTIFY_INFO            0x81
  60
  61 ACPI_MODULE_NAME("sbs");
  62
  63 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
  64 MODULE_DESCRIPTION("Smart Battery System ACPI interface driver");
  65 MODULE_LICENSE("GPL");
  66
  67 static unsigned int cache_time = 1000;
  68 module_param(cache_time, uint, 0644);
  69 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
  70
  71 extern struct proc_dir_entry *acpi_lock_ac_dir(void);
  72 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
  73 extern void acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
  74 extern void acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
  75
  76 #define MAX_SBS_BAT                     4
  77 #define ACPI_SBS_BLOCK_MAX              32
  78
  79 static int acpi_sbs_add(struct acpi_device *device);
  80 static int acpi_sbs_remove(struct acpi_device *device, int type);
  81 static int acpi_sbs_resume(struct acpi_device *device);
  82
  83 static const struct acpi_device_id sbs_device_ids[] = {
  84         {"ACPI0002", 0},
  85         {"", 0},
  86 };
  87 MODULE_DEVICE_TABLE(acpi, sbs_device_ids);
  88
  89 static struct acpi_driver acpi_sbs_driver = {
  90         .name = "sbs",
  91         .class = ACPI_SBS_CLASS,
  92         .ids = sbs_device_ids,
  93         .ops = {
  94                 .add = acpi_sbs_add,
  95                 .remove = acpi_sbs_remove,
  96                 .resume = acpi_sbs_resume,
  97                 },
  98 };
  99
 100 struct acpi_battery {
 101         struct acpi_sbs *sbs;
 102         struct proc_dir_entry *proc_entry;
 103         unsigned long update_time;
 104         char name[8];
 105         char manufacturer_name[ACPI_SBS_BLOCK_MAX];
 106         char device_name[ACPI_SBS_BLOCK_MAX];
 107         char device_chemistry[ACPI_SBS_BLOCK_MAX];
 108         u32 alarm_capacity;
 109         u16 full_charge_capacity;
 110         u16 design_capacity;
 111         u16 design_voltage;
 112         u16 serial_number;
 113         u16 cycle_count;
 114         u16 temp_now;
 115         u16 voltage_now;
 116         s16 current_now;
 117         s16 current_avg;
 118         u16 capacity_now;
 119         u16 state_of_charge;
 120         u16 state;
 121         u16 mode;
 122         u16 spec;
 123         u8 id;
 124         u8 present:1;
 125 };
 126
 127 struct acpi_sbs {
 128         struct acpi_device *device;
 129         struct acpi_smb_hc *hc;
 130         struct mutex lock;
 131         struct proc_dir_entry *charger_entry;
 132         struct acpi_battery battery[MAX_SBS_BAT];
 133         u8 batteries_supported:4;
 134         u8 manager_present:1;
 135         u8 charger_present:1;
 136 };
 137
 138 static inline int battery_scale(int log)
 139 {
 140         int scale = 1;
 141         while (log--)
 142                 scale *= 10;
 143         return scale;
 144 }
 145
 146 static inline int acpi_battery_vscale(struct acpi_battery *battery)
 147 {
 148         return battery_scale((battery->spec & 0x0f00) >> 8);
 149 }
 150
 151 static inline int acpi_battery_ipscale(struct acpi_battery *battery)
 152 {
 153         return battery_scale((battery->spec & 0xf000) >> 12);
 154 }
 155
 156 static inline int acpi_battery_mode(struct acpi_battery *battery)
 157 {
 158         return (battery->mode & 0x8000);
 159 }
 160
 161 static inline int acpi_battery_scale(struct acpi_battery *battery)
 162 {
 163         return (acpi_battery_mode(battery) ? 10 : 1) *
 164             acpi_battery_ipscale(battery);
 165 }
 166
 167 /* --------------------------------------------------------------------------
 168                             Smart Battery System Management
 169    -------------------------------------------------------------------------- */
 170
 171 struct acpi_battery_reader {
 172         u8 command;             /* command for battery */
 173         u8 mode;                /* word or block? */
 174         size_t offset;          /* offset inside struct acpi_sbs_battery */
 175 };
 176
 177 static struct acpi_battery_reader info_readers[] = {
 178         {0x01, SMBUS_READ_WORD, offsetof(struct acpi_battery, alarm_capacity)},
 179         {0x03, SMBUS_READ_WORD, offsetof(struct acpi_battery, mode)},
 180         {0x10, SMBUS_READ_WORD, offsetof(struct acpi_battery, full_charge_capacity)},
 181         {0x17, SMBUS_READ_WORD, offsetof(struct acpi_battery, cycle_count)},
 182         {0x18, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_capacity)},
 183         {0x19, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_voltage)},
 184         {0x1a, SMBUS_READ_WORD, offsetof(struct acpi_battery, spec)},
 185         {0x1c, SMBUS_READ_WORD, offsetof(struct acpi_battery, serial_number)},
 186         {0x20, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, manufacturer_name)},
 187         {0x21, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_name)},
 188         {0x22, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_chemistry)},
 189 };
 190
 191 static struct acpi_battery_reader state_readers[] = {
 192         {0x08, SMBUS_READ_WORD, offsetof(struct acpi_battery, temp_now)},
 193         {0x09, SMBUS_READ_WORD, offsetof(struct acpi_battery, voltage_now)},
 194         {0x0a, SMBUS_READ_WORD, offsetof(struct acpi_battery, current_now)},
 195         {0x0b, SMBUS_READ_WORD, offsetof(struct acpi_battery, current_avg)},
 196         {0x0f, SMBUS_READ_WORD, offsetof(struct acpi_battery, capacity_now)},
 197         {0x0e, SMBUS_READ_WORD, offsetof(struct acpi_battery, state_of_charge)},
 198         {0x16, SMBUS_READ_WORD, offsetof(struct acpi_battery, state)},
 199 };
 200
 201 static int acpi_manager_get_info(struct acpi_sbs *sbs)
 202 {
 203         int result = 0;
 204         u16 battery_system_info;
 205
 206         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
 207                                  0x04, (u8 *) & battery_system_info);
 208         if (!result)
 209                 sbs->batteries_supported = battery_system_info & 0x000f;
 210         return result;
 211 }
 212
 213 static int acpi_battery_get_info(struct acpi_battery *battery)
 214 {
 215         int i, result = 0;
 216
 217         for (i = 0; i < ARRAY_SIZE(info_readers); ++i) {
 218                 result = acpi_smbus_read(battery->sbs->hc, info_readers[i].mode,
 219                                     ACPI_SBS_BATTERY, info_readers[i].command,
 220                                     (u8 *) battery + info_readers[i].offset);
 221                 if (result)
 222                         break;
 223         }
 224         return result;
 225 }
 226
 227 static int acpi_battery_get_state(struct acpi_battery *battery)
 228 {
 229         int i, result = 0;
 230
 231         if (time_before(jiffies, battery->update_time +
 232                                 msecs_to_jiffies(cache_time)))
 233                 return 0;
 234         for (i = 0; i < ARRAY_SIZE(state_readers); ++i) {
 235                 result = acpi_smbus_read(battery->sbs->hc,
 236                                          state_readers[i].mode,
 237                                          ACPI_SBS_BATTERY,
 238                                          state_readers[i].command,
 239                                          (u8 *)battery +
 240                                                 state_readers[i].offset);
 241                 if (result)
 242                         goto end;
 243         }
 244       end:
 245         battery->update_time = jiffies;
 246         return result;
 247 }
 248
 249 static int acpi_battery_get_alarm(struct acpi_battery *battery)
 250 {
 251         return acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
 252                                  ACPI_SBS_BATTERY, 0x01,
 253                                  (u8 *) & battery->alarm_capacity);
 254 }
 255
 256 static int acpi_battery_set_alarm(struct acpi_battery *battery)
 257 {
 258         struct acpi_sbs *sbs = battery->sbs;
 259         u16 value;
 260         return 0;
 261
 262         if (sbs->manager_present) {
 263                 acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
 264                                 0x01, (u8 *)&value);
 265                 value &= 0x0fff;
 266                 value |= 1 << (battery->id + 12);
 267                 acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD, ACPI_SBS_MANAGER,
 268                                 0x01, (u8 *)&value, 2);
 269         }
 270         value = battery->alarm_capacity / (acpi_battery_mode(battery) ? 10 : 1);
 271         return acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD, ACPI_SBS_BATTERY,
 272                                 0x01, (u8 *)&value, 2);
 273 }
 274
 275 static int acpi_ac_get_present(struct acpi_sbs *sbs)
 276 {
 277         int result;
 278         u16 status;
 279
 280         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_CHARGER,
 281                                  0x13, (u8 *) & status);
 282         if (!result)
 283                 sbs->charger_present = (status >> 15) & 0x1;
 284         return result;
 285 }
 286
 287 /* --------------------------------------------------------------------------
 288                               FS Interface (/proc/acpi)
 289    -------------------------------------------------------------------------- */
 290
 291 /* Generic Routines */
 292
 293 static int
 294 acpi_sbs_add_fs(struct proc_dir_entry **dir,
 295                         struct proc_dir_entry *parent_dir,
 296                         char *dir_name,
 297                         struct file_operations *info_fops,
 298                         struct file_operations *state_fops,
 299                         struct file_operations *alarm_fops, void *data)
 300 {
 301         struct proc_dir_entry *entry = NULL;
 302
 303         if (!*dir) {
 304                 *dir = proc_mkdir(dir_name, parent_dir);
 305                 if (!*dir) {
 306                         ACPI_EXCEPTION((AE_INFO, AE_ERROR,
 307                                         "proc_mkdir() failed"));
 308                         return -ENODEV;
 309                 }
 310                 (*dir)->owner = THIS_MODULE;
 311         }
 312
 313         /* 'info' [R] */
 314         if (info_fops) {
 315                 entry = create_proc_entry(ACPI_SBS_FILE_INFO, S_IRUGO, *dir);
 316                 if (!entry) {
 317                         ACPI_EXCEPTION((AE_INFO, AE_ERROR,
 318                                         "create_proc_entry() failed"));
 319                 } else {
 320                         entry->proc_fops = info_fops;
 321                         entry->data = data;
 322                         entry->owner = THIS_MODULE;
 323                 }
 324         }
 325
 326         /* 'state' [R] */
 327         if (state_fops) {
 328                 entry = create_proc_entry(ACPI_SBS_FILE_STATE, S_IRUGO, *dir);
 329                 if (!entry) {
 330                         ACPI_EXCEPTION((AE_INFO, AE_ERROR,
 331                                         "create_proc_entry() failed"));
 332                 } else {
 333                         entry->proc_fops = state_fops;
 334                         entry->data = data;
 335                         entry->owner = THIS_MODULE;
 336                 }
 337         }
 338
 339         /* 'alarm' [R/W] */
 340         if (alarm_fops) {
 341                 entry = create_proc_entry(ACPI_SBS_FILE_ALARM, S_IRUGO, *dir);
 342                 if (!entry) {
 343                         ACPI_EXCEPTION((AE_INFO, AE_ERROR,
 344                                         "create_proc_entry() failed"));
 345                 } else {
 346                         entry->proc_fops = alarm_fops;
 347                         entry->data = data;
 348                         entry->owner = THIS_MODULE;
 349                 }
 350         }
 351
 352         return 0;
 353 }
 354
 355 static void
 356 acpi_sbs_remove_fs(struct proc_dir_entry **dir,
 357                            struct proc_dir_entry *parent_dir)
 358 {
 359
 360         if (*dir) {
 361                 remove_proc_entry(ACPI_SBS_FILE_INFO, *dir);
 362                 remove_proc_entry(ACPI_SBS_FILE_STATE, *dir);
 363                 remove_proc_entry(ACPI_SBS_FILE_ALARM, *dir);
 364                 remove_proc_entry((*dir)->name, parent_dir);
 365                 *dir = NULL;
 366         }
 367
 368 }
 369
 370 /* Smart Battery Interface */
 371
 372 static struct proc_dir_entry *acpi_battery_dir = NULL;
 373
 374 static inline char *acpi_battery_units(struct acpi_battery *battery)
 375 {
 376         return acpi_battery_mode(battery) ? " mWh" : " mAh";
 377 }
 378
 379
 380 static int acpi_battery_read_info(struct seq_file *seq, void *offset)
 381 {
 382         struct acpi_battery *battery = seq->private;
 383         struct acpi_sbs *sbs = battery->sbs;
 384         int result = 0;
 385
 386         mutex_lock(&sbs->lock);
 387
 388         seq_printf(seq, "present:                 %s\n",
 389                    (battery->present) ? "yes" : "no");
 390         if (!battery->present)
 391                 goto end;
 392
 393         seq_printf(seq, "design capacity:         %i%s\n",
 394                    battery->design_capacity * acpi_battery_scale(battery),
 395                    acpi_battery_units(battery));
 396         seq_printf(seq, "last full capacity:      %i%s\n",
 397                    battery->full_charge_capacity * acpi_battery_scale(battery),
 398                    acpi_battery_units(battery));
 399         seq_printf(seq, "battery technology:      rechargeable\n");
 400         seq_printf(seq, "design voltage:          %i mV\n",
 401                    battery->design_voltage * acpi_battery_vscale(battery));
 402         seq_printf(seq, "design capacity warning: unknown\n");
 403         seq_printf(seq, "design capacity low:     unknown\n");
 404         seq_printf(seq, "capacity granularity 1:  unknown\n");
 405         seq_printf(seq, "capacity granularity 2:  unknown\n");
 406         seq_printf(seq, "model number:            %s\n", battery->device_name);
 407         seq_printf(seq, "serial number:           %i\n",
 408                    battery->serial_number);
 409         seq_printf(seq, "battery type:            %s\n",
 410                    battery->device_chemistry);
 411         seq_printf(seq, "OEM info:                %s\n",
 412                    battery->manufacturer_name);
 413       end:
 414         mutex_unlock(&sbs->lock);
 415         return result;
 416 }
 417
 418 static int acpi_battery_info_open_fs(struct inode *inode, struct file *file)
 419 {
 420         return single_open(file, acpi_battery_read_info, PDE(inode)->data);
 421 }
 422
 423 static int acpi_battery_read_state(struct seq_file *seq, void *offset)
 424 {
 425         struct acpi_battery *battery = seq->private;
 426         struct acpi_sbs *sbs = battery->sbs;
 427         int result = 0;
 428
 429         mutex_lock(&sbs->lock);
 430         seq_printf(seq, "present:                 %s\n",
 431                    (battery->present) ? "yes" : "no");
 432         if (!battery->present)
 433                 goto end;
 434
 435         acpi_battery_get_state(battery);
 436         seq_printf(seq, "capacity state:          %s\n",
 437                    (battery->state & 0x0010) ? "critical" : "ok");
 438         seq_printf(seq, "charging state:          %s\n",
 439                    (battery->current_now < 0) ? "discharging" :
 440                    ((battery->current_now > 0) ? "charging" : "charged"));
 441         seq_printf(seq, "present rate:            %d mA\n",
 442                    abs(battery->current_now) * acpi_battery_ipscale(battery));
 443         seq_printf(seq, "remaining capacity:      %i%s\n",
 444                    battery->capacity_now * acpi_battery_scale(battery),
 445                    acpi_battery_units(battery));
 446         seq_printf(seq, "present voltage:         %i mV\n",
 447                    battery->voltage_now * acpi_battery_vscale(battery));
 448
 449       end:
 450         mutex_unlock(&sbs->lock);
 451         return result;
 452 }
 453
 454 static int acpi_battery_state_open_fs(struct inode *inode, struct file *file)
 455 {
 456         return single_open(file, acpi_battery_read_state, PDE(inode)->data);
 457 }
 458
 459 static int acpi_battery_read_alarm(struct seq_file *seq, void *offset)
 460 {
 461         struct acpi_battery *battery = seq->private;
 462         struct acpi_sbs *sbs = battery->sbs;
 463         int result = 0;
 464
 465         mutex_lock(&sbs->lock);
 466
 467         if (!battery->present) {
 468                 seq_printf(seq, "present:                 no\n");
 469                 goto end;
 470         }
 471
 472         acpi_battery_get_alarm(battery);
 473         seq_printf(seq, "alarm:                   ");
 474         if (battery->alarm_capacity)
 475                 seq_printf(seq, "%i%s\n",
 476                            battery->alarm_capacity *
 477                            acpi_battery_scale(battery),
 478                            acpi_battery_units(battery));
 479         else
 480                 seq_printf(seq, "disabled\n");
 481       end:
 482         mutex_unlock(&sbs->lock);
 483         return result;
 484 }
 485
 486 static ssize_t
 487 acpi_battery_write_alarm(struct file *file, const char __user * buffer,
 488                          size_t count, loff_t * ppos)
 489 {
 490         struct seq_file *seq = file->private_data;
 491         struct acpi_battery *battery = seq->private;
 492         struct acpi_sbs *sbs = battery->sbs;
 493         char alarm_string[12] = { '\0' };
 494         int result = 0;
 495         mutex_lock(&sbs->lock);
 496         if (!battery->present) {
 497                 result = -ENODEV;
 498                 goto end;
 499         }
 500         if (count > sizeof(alarm_string) - 1) {
 501                 result = -EINVAL;
 502                 goto end;
 503         }
 504         if (copy_from_user(alarm_string, buffer, count)) {
 505                 result = -EFAULT;
 506                 goto end;
 507         }
 508         alarm_string[count] = 0;
 509         battery->alarm_capacity = simple_strtoul(alarm_string, NULL, 0);
 510         acpi_battery_set_alarm(battery);
 511       end:
 512         mutex_unlock(&sbs->lock);
 513         if (result)
 514                 return result;
 515         return count;
 516 }
 517
 518 static int acpi_battery_alarm_open_fs(struct inode *inode, struct file *file)
 519 {
 520         return single_open(file, acpi_battery_read_alarm, PDE(inode)->data);
 521 }
 522
 523 static struct file_operations acpi_battery_info_fops = {
 524         .open = acpi_battery_info_open_fs,
 525         .read = seq_read,
 526         .llseek = seq_lseek,
 527         .release = single_release,
 528         .owner = THIS_MODULE,
 529 };
 530
 531 static struct file_operations acpi_battery_state_fops = {
 532         .open = acpi_battery_state_open_fs,
 533         .read = seq_read,
 534         .llseek = seq_lseek,
 535         .release = single_release,
 536         .owner = THIS_MODULE,
 537 };
 538
 539 static struct file_operations acpi_battery_alarm_fops = {
 540         .open = acpi_battery_alarm_open_fs,
 541         .read = seq_read,
 542         .write = acpi_battery_write_alarm,
 543         .llseek = seq_lseek,
 544         .release = single_release,
 545         .owner = THIS_MODULE,
 546 };
 547
 548 /* Legacy AC Adapter Interface */
 549
 550 static struct proc_dir_entry *acpi_ac_dir = NULL;
 551
 552 static int acpi_ac_read_state(struct seq_file *seq, void *offset)
 553 {
 554
 555         struct acpi_sbs *sbs = seq->private;
 556
 557         mutex_lock(&sbs->lock);
 558
 559         seq_printf(seq, "state:                   %s\n",
 560                    sbs->charger_present ? "on-line" : "off-line");
 561
 562         mutex_unlock(&sbs->lock);
 563         return 0;
 564 }
 565
 566 static int acpi_ac_state_open_fs(struct inode *inode, struct file *file)
 567 {
 568         return single_open(file, acpi_ac_read_state, PDE(inode)->data);
 569 }
 570
 571 static struct file_operations acpi_ac_state_fops = {
 572         .open = acpi_ac_state_open_fs,
 573         .read = seq_read,
 574         .llseek = seq_lseek,
 575         .release = single_release,
 576         .owner = THIS_MODULE,
 577 };
 578
 579 /* --------------------------------------------------------------------------
 580                                  Driver Interface
 581    -------------------------------------------------------------------------- */
 582
 583 /* Smart Battery */
 584
 585 static int acpi_battery_read(struct acpi_battery *battery)
 586 {
 587         int result = 0, saved_present = battery->present;
 588         u16 state;
 589
 590         if (battery->sbs->manager_present) {
 591                 result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
 592                                 ACPI_SBS_MANAGER, 0x01, (u8 *)&state);
 593                 if (!result)
 594                         battery->present = state & (1 << battery->id);
 595                 state &= 0x0fff;
 596                 state |= 1 << (battery->id + 12);
 597                 acpi_smbus_write(battery->sbs->hc, SMBUS_WRITE_WORD,
 598                                   ACPI_SBS_MANAGER, 0x01, (u8 *)&state, 2);
 599         } else if (battery->id == 0)
 600                 battery->present = 1;
 601         if (result || !battery->present)
 602                 return result;
 603
 604         if (saved_present != battery->present) {
 605                 battery->update_time = 0;
 606                 result = acpi_battery_get_info(battery);
 607                 if (result)
 608                         return result;
 609         }
 610         result = acpi_battery_get_state(battery);
 611         return result;
 612 }
 613
 614 static int acpi_battery_add(struct acpi_sbs *sbs, int id)
 615 {
 616         int result;
 617         struct acpi_battery *battery = &sbs->battery[id];
 618         battery->id = id;
 619         battery->sbs = sbs;
 620         battery->update_time = 0;
 621         result = acpi_battery_read(battery);
 622         if (result)
 623                 return result;
 624
 625         sprintf(battery->name, ACPI_BATTERY_DIR_NAME, id);
 626         acpi_sbs_add_fs(&battery->proc_entry, acpi_battery_dir,
 627                         battery->name, &acpi_battery_info_fops,
 628                         &acpi_battery_state_fops, &acpi_battery_alarm_fops,
 629                         battery);
 630         printk(KERN_INFO PREFIX "%s [%s]: Battery Slot [%s] (battery %s)\n",
 631                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
 632                battery->name, sbs->battery->present ? "present" : "absent");
 633         return result;
 634 }
 635
 636 static void acpi_battery_remove(struct acpi_sbs *sbs, int id)
 637 {
 638
 639         if (sbs->battery[id].proc_entry) {
 640                 acpi_sbs_remove_fs(&(sbs->battery[id].proc_entry),
 641                                    acpi_battery_dir);
 642         }
 643 }
 644
 645 static int acpi_charger_add(struct acpi_sbs *sbs)
 646 {
 647         int result;
 648
 649         result = acpi_ac_get_present(sbs);
 650         if (result)
 651                 goto end;
 652         result = acpi_sbs_add_fs(&sbs->charger_entry, acpi_ac_dir,
 653                                  ACPI_AC_DIR_NAME, NULL,
 654                                  &acpi_ac_state_fops, NULL, sbs);
 655         if (result)
 656                 goto end;
 657         printk(KERN_INFO PREFIX "%s [%s]: AC Adapter [%s] (%s)\n",
 658                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
 659                ACPI_AC_DIR_NAME, sbs->charger_present ? "on-line" : "off-line");
 660       end:
 661         return result;
 662 }
 663
 664 static void acpi_charger_remove(struct acpi_sbs *sbs)
 665 {
 666
 667         if (sbs->charger_entry)
 668                 acpi_sbs_remove_fs(&sbs->charger_entry, acpi_ac_dir);
 669 }
 670
 671 void acpi_sbs_callback(void *context)
 672 {
 673         int id;
 674         struct acpi_sbs *sbs = context;
 675         struct acpi_battery *bat;
 676         u8 saved_charger_state = sbs->charger_present;
 677         u8 saved_battery_state;
 678         acpi_ac_get_present(sbs);
 679         if (sbs->charger_present != saved_charger_state) {
 680                 acpi_bus_generate_proc_event4(ACPI_AC_CLASS, ACPI_AC_DIR_NAME,
 681                                               ACPI_SBS_NOTIFY_STATUS,
 682                                               sbs->charger_present);
 683         }
 684         if (sbs->manager_present) {
 685                 for (id = 0; id < MAX_SBS_BAT; ++id) {
 686                         if (!(sbs->batteries_supported & (1 << id)))
 687                                 continue;
 688                         bat = &sbs->battery[id];
 689                         saved_battery_state = bat->present;
 690                         acpi_battery_read(bat);
 691                         if (saved_battery_state == bat->present)
 692                                 continue;
 693                         acpi_bus_generate_proc_event4(ACPI_BATTERY_CLASS,
 694                                                       bat->name,
 695                                                       ACPI_SBS_NOTIFY_STATUS,
 696                                                       bat->present);
 697                 }
 698         }
 699 }
 700
 701 static int acpi_sbs_remove(struct acpi_device *device, int type);
 702
 703 static int acpi_sbs_add(struct acpi_device *device)
 704 {
 705         struct acpi_sbs *sbs;
 706         int result = 0;
 707         int id;
 708
 709         sbs = kzalloc(sizeof(struct acpi_sbs), GFP_KERNEL);
 710         if (!sbs) {
 711                 result = -ENOMEM;
 712                 goto end;
 713         }
 714
 715         mutex_init(&sbs->lock);
 716
 717         sbs->hc = acpi_driver_data(device->parent);
 718         sbs->device = device;
 719         strcpy(acpi_device_name(device), ACPI_SBS_DEVICE_NAME);
 720         strcpy(acpi_device_class(device), ACPI_SBS_CLASS);
 721         acpi_driver_data(device) = sbs;
 722
 723         result = acpi_charger_add(sbs);
 724         if (result)
 725                 goto end;
 726
 727         result = acpi_manager_get_info(sbs);
 728         if (!result) {
 729                 sbs->manager_present = 1;
 730                 for (id = 0; id < MAX_SBS_BAT; ++id)
 731                         if ((sbs->batteries_supported & (1 << id)))
 732                                 acpi_battery_add(sbs, id);
 733         } else
 734                 acpi_battery_add(sbs, 0);
 735         acpi_smbus_register_callback(sbs->hc, acpi_sbs_callback, sbs);
 736       end:
 737         if (result)
 738                 acpi_sbs_remove(device, 0);
 739         return result;
 740 }
 741
 742 static int acpi_sbs_remove(struct acpi_device *device, int type)
 743 {
 744         struct acpi_sbs *sbs;
 745         int id;
 746
 747         if (!device)
 748                 return -EINVAL;
 749         sbs = acpi_driver_data(device);
 750         if (!sbs)
 751                 return -EINVAL;
 752         mutex_lock(&sbs->lock);
 753         acpi_smbus_unregister_callback(sbs->hc);
 754         for (id = 0; id < MAX_SBS_BAT; ++id)
 755                 acpi_battery_remove(sbs, id);
 756         acpi_charger_remove(sbs);
 757         mutex_unlock(&sbs->lock);
 758         mutex_destroy(&sbs->lock);
 759         kfree(sbs);
 760         return 0;
 761 }
 762
 763 static void acpi_sbs_rmdirs(void)
 764 {
 765         if (acpi_ac_dir) {
 766                 acpi_unlock_ac_dir(acpi_ac_dir);
 767                 acpi_ac_dir = NULL;
 768         }
 769         if (acpi_battery_dir) {
 770                 acpi_unlock_battery_dir(acpi_battery_dir);
 771                 acpi_battery_dir = NULL;
 772         }
 773 }
 774
 775 static int acpi_sbs_resume(struct acpi_device *device)
 776 {
 777         struct acpi_sbs *sbs;
 778         if (!device)
 779                 return -EINVAL;
 780         sbs = device->driver_data;
 781         acpi_sbs_callback(sbs);
 782         return 0;
 783 }
 784
 785 static int __init acpi_sbs_init(void)
 786 {
 787         int result = 0;
 788
 789         if (acpi_disabled)
 790                 return -ENODEV;
 791
 792         acpi_ac_dir = acpi_lock_ac_dir();
 793         if (!acpi_ac_dir) {
 794                 ACPI_EXCEPTION((AE_INFO, AE_ERROR,
 795                                 "acpi_lock_ac_dir() failed"));
 796                 return -ENODEV;
 797         }
 798
 799         acpi_battery_dir = acpi_lock_battery_dir();
 800         if (!acpi_battery_dir) {
 801                 ACPI_EXCEPTION((AE_INFO, AE_ERROR,
 802                                 "acpi_lock_battery_dir() failed"));
 803                 acpi_sbs_rmdirs();
 804                 return -ENODEV;
 805         }
 806
 807         result = acpi_bus_register_driver(&acpi_sbs_driver);
 808         if (result < 0) {
 809                 ACPI_EXCEPTION((AE_INFO, AE_ERROR,
 810                                 "acpi_bus_register_driver() failed"));
 811                 acpi_sbs_rmdirs();
 812                 return -ENODEV;
 813         }
 814
 815         return 0;
 816 }
 817
 818 static void __exit acpi_sbs_exit(void)
 819 {
 820         acpi_bus_unregister_driver(&acpi_sbs_driver);
 821
 822         acpi_sbs_rmdirs();
 823
 824         return;
 825 }
 826
 827 module_init(acpi_sbs_init);
 828 module_exit(acpi_sbs_exit);