SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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 #include <linux/proc_fs.h>
  33 #include <linux/seq_file.h>
  34 #include <asm/uaccess.h>
  35
  36 #include <linux/acpi.h>
  37 #include <linux/timer.h>
  38 #include <linux/jiffies.h>
  39 #include <linux/delay.h>
  40
  41 #include <linux/power_supply.h>
  42
  43 #include "sbshc.h"
  44
  45 #define ACPI_SBS_CLASS                  "sbs"
  46 #define ACPI_AC_CLASS                   "ac_adapter"
  47 #define ACPI_BATTERY_CLASS              "battery"
  48 #define ACPI_SBS_DEVICE_NAME            "Smart Battery System"
  49 #define ACPI_SBS_FILE_INFO              "info"
  50 #define ACPI_SBS_FILE_STATE             "state"
  51 #define ACPI_SBS_FILE_ALARM             "alarm"
  52 #define ACPI_BATTERY_DIR_NAME           "BAT%i"
  53 #define ACPI_AC_DIR_NAME                "AC0"
  54
  55 enum acpi_sbs_device_addr {
  56         ACPI_SBS_CHARGER = 0x9,
  57         ACPI_SBS_MANAGER = 0xa,
  58         ACPI_SBS_BATTERY = 0xb,
  59 };
  60
  61 #define ACPI_SBS_NOTIFY_STATUS          0x80
  62 #define ACPI_SBS_NOTIFY_INFO            0x81
  63
  64 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
  65 MODULE_DESCRIPTION("Smart Battery System ACPI interface driver");
  66 MODULE_LICENSE("GPL");
  67
  68 static unsigned int cache_time = 1000;
  69 module_param(cache_time, uint, 0644);
  70 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
  71
  72 extern struct proc_dir_entry *acpi_lock_ac_dir(void);
  73 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
  74 extern void acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
  75 extern void acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
  76
  77 #define MAX_SBS_BAT                     4
  78 #define ACPI_SBS_BLOCK_MAX              32
  79
  80 static const struct acpi_device_id sbs_device_ids[] = {
  81         {"ACPI0002", 0},
  82         {"", 0},
  83 };
  84 MODULE_DEVICE_TABLE(acpi, sbs_device_ids);
  85
  86 struct acpi_battery {
  87         struct power_supply bat;
  88         struct acpi_sbs *sbs;
  89         struct proc_dir_entry *proc_entry;
  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 current_now;
 104         s16 current_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 };
 113
 114 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
 115
 116 struct acpi_sbs {
 117         struct power_supply charger;
 118         struct acpi_device *device;
 119         struct acpi_smb_hc *hc;
 120         struct mutex lock;
 121         struct proc_dir_entry *charger_entry;
 122         struct acpi_battery battery[MAX_SBS_BAT];
 123         u8 batteries_supported:4;
 124         u8 manager_present:1;
 125         u8 charger_present:1;
 126 };
 127
 128 #define to_acpi_sbs(x) container_of(x, struct acpi_sbs, charger)
 129
 130 static inline int battery_scale(int log)
 131 {
 132         int scale = 1;
 133         while (log--)
 134                 scale *= 10;
 135         return scale;
 136 }
 137
 138 static inline int acpi_battery_vscale(struct acpi_battery *battery)
 139 {
 140         return battery_scale((battery->spec & 0x0f00) >> 8);
 141 }
 142
 143 static inline int acpi_battery_ipscale(struct acpi_battery *battery)
 144 {
 145         return battery_scale((battery->spec & 0xf000) >> 12);
 146 }
 147
 148 static inline int acpi_battery_mode(struct acpi_battery *battery)
 149 {
 150         return (battery->mode & 0x8000);
 151 }
 152
 153 static inline int acpi_battery_scale(struct acpi_battery *battery)
 154 {
 155         return (acpi_battery_mode(battery) ? 10 : 1) *
 156             acpi_battery_ipscale(battery);
 157 }
 158
 159 static int sbs_get_ac_property(struct power_supply *psy,
 160                                enum power_supply_property psp,
 161                                union power_supply_propval *val)
 162 {
 163         struct acpi_sbs *sbs = to_acpi_sbs(psy);
 164         switch (psp) {
 165         case POWER_SUPPLY_PROP_ONLINE:
 166                 val->intval = sbs->charger_present;
 167                 break;
 168         default:
 169                 return -EINVAL;
 170         }
 171         return 0;
 172 }
 173
 174 static int acpi_battery_technology(struct acpi_battery *battery)
 175 {
 176         if (!strcasecmp("NiCd", battery->device_chemistry))
 177                 return POWER_SUPPLY_TECHNOLOGY_NiCd;
 178         if (!strcasecmp("NiMH", battery->device_chemistry))
 179                 return POWER_SUPPLY_TECHNOLOGY_NiMH;
 180         if (!strcasecmp("LION", battery->device_chemistry))
 181                 return POWER_SUPPLY_TECHNOLOGY_LION;
 182         if (!strcasecmp("LiP", battery->device_chemistry))
 183                 return POWER_SUPPLY_TECHNOLOGY_LIPO;
 184         return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 185 }
 186
 187 static int acpi_sbs_battery_get_property(struct power_supply *psy,
 188                                          enum power_supply_property psp,
 189                                          union power_supply_propval *val)
 190 {
 191         struct acpi_battery *battery = to_acpi_battery(psy);
 192
 193         if ((!battery->present) && psp != POWER_SUPPLY_PROP_PRESENT)
 194                 return -ENODEV;
 195         switch (psp) {
 196         case POWER_SUPPLY_PROP_STATUS:
 197                 if (battery->current_now < 0)
 198                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 199                 else if (battery->current_now > 0)
 200                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 201                 else
 202                         val->intval = POWER_SUPPLY_STATUS_FULL;
 203                 break;
 204         case POWER_SUPPLY_PROP_PRESENT:
 205                 val->intval = battery->present;
 206                 break;
 207         case POWER_SUPPLY_PROP_TECHNOLOGY:
 208                 val->intval = acpi_battery_technology(battery);
 209                 break;
 210         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 211                 val->intval = battery->design_voltage *
 212                         acpi_battery_vscale(battery) * 1000;
 213                 break;
 214         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 215                 val->intval = battery->voltage_now *
 216                                 acpi_battery_vscale(battery) * 1000;
 217                 break;
 218         case POWER_SUPPLY_PROP_CURRENT_NOW:
 219                 val->intval = abs(battery->current_now) *
 220                                 acpi_battery_ipscale(battery) * 1000;
 221                 break;
 222         case POWER_SUPPLY_PROP_CURRENT_AVG:
 223                 val->intval = abs(battery->current_avg) *
 224                                 acpi_battery_ipscale(battery) * 1000;
 225                 break;
 226         case POWER_SUPPLY_PROP_CAPACITY:
 227                 val->intval = battery->state_of_charge;
 228                 break;
 229         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 230         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 231                 val->intval = battery->design_capacity *
 232                         acpi_battery_scale(battery) * 1000;
 233                 break;
 234         case POWER_SUPPLY_PROP_CHARGE_FULL:
 235         case POWER_SUPPLY_PROP_ENERGY_FULL:
 236                 val->intval = battery->full_charge_capacity *
 237                         acpi_battery_scale(battery) * 1000;
 238                 break;
 239         case POWER_SUPPLY_PROP_CHARGE_NOW:
 240         case POWER_SUPPLY_PROP_ENERGY_NOW:
 241                 val->intval = battery->capacity_now *
 242                                 acpi_battery_scale(battery) * 1000;
 243                 break;
 244         case POWER_SUPPLY_PROP_TEMP:
 245                 val->intval = battery->temp_now - 2730; // dK -> dC
 246                 break;
 247         case POWER_SUPPLY_PROP_MODEL_NAME:
 248                 val->strval = battery->device_name;
 249                 break;
 250         case POWER_SUPPLY_PROP_MANUFACTURER:
 251                 val->strval = battery->manufacturer_name;
 252                 break;
 253         default:
 254                 return -EINVAL;
 255         }
 256         return 0;
 257 }
 258
 259 static enum power_supply_property sbs_ac_props[] = {
 260         POWER_SUPPLY_PROP_ONLINE,
 261 };
 262
 263 static enum power_supply_property sbs_charge_battery_props[] = {
 264         POWER_SUPPLY_PROP_STATUS,
 265         POWER_SUPPLY_PROP_PRESENT,
 266         POWER_SUPPLY_PROP_TECHNOLOGY,
 267         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 268         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 269         POWER_SUPPLY_PROP_CURRENT_NOW,
 270         POWER_SUPPLY_PROP_CURRENT_AVG,
 271         POWER_SUPPLY_PROP_CAPACITY,
 272         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 273         POWER_SUPPLY_PROP_CHARGE_FULL,
 274         POWER_SUPPLY_PROP_CHARGE_NOW,
 275         POWER_SUPPLY_PROP_TEMP,
 276         POWER_SUPPLY_PROP_MODEL_NAME,
 277         POWER_SUPPLY_PROP_MANUFACTURER,
 278 };
 279
 280 static enum power_supply_property sbs_energy_battery_props[] = {
 281         POWER_SUPPLY_PROP_STATUS,
 282         POWER_SUPPLY_PROP_PRESENT,
 283         POWER_SUPPLY_PROP_TECHNOLOGY,
 284         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 285         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 286         POWER_SUPPLY_PROP_CURRENT_NOW,
 287         POWER_SUPPLY_PROP_CURRENT_AVG,
 288         POWER_SUPPLY_PROP_CAPACITY,
 289         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 290         POWER_SUPPLY_PROP_ENERGY_FULL,
 291         POWER_SUPPLY_PROP_ENERGY_NOW,
 292         POWER_SUPPLY_PROP_TEMP,
 293         POWER_SUPPLY_PROP_MODEL_NAME,
 294         POWER_SUPPLY_PROP_MANUFACTURER,
 295 };
 296
 297 /* --------------------------------------------------------------------------
 298                             Smart Battery System Management
 299    -------------------------------------------------------------------------- */
 300
 301 struct acpi_battery_reader {
 302         u8 command;             /* command for battery */
 303         u8 mode;                /* word or block? */
 304         size_t offset;          /* offset inside struct acpi_sbs_battery */
 305 };
 306
 307 static struct acpi_battery_reader info_readers[] = {
 308         {0x01, SMBUS_READ_WORD, offsetof(struct acpi_battery, alarm_capacity)},
 309         {0x03, SMBUS_READ_WORD, offsetof(struct acpi_battery, mode)},
 310         {0x10, SMBUS_READ_WORD, offsetof(struct acpi_battery, full_charge_capacity)},
 311         {0x17, SMBUS_READ_WORD, offsetof(struct acpi_battery, cycle_count)},
 312         {0x18, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_capacity)},
 313         {0x19, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_voltage)},
 314         {0x1a, SMBUS_READ_WORD, offsetof(struct acpi_battery, spec)},
 315         {0x1c, SMBUS_READ_WORD, offsetof(struct acpi_battery, serial_number)},
 316         {0x20, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, manufacturer_name)},
 317         {0x21, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_name)},
 318         {0x22, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_chemistry)},
 319 };
 320
 321 static struct acpi_battery_reader state_readers[] = {
 322         {0x08, SMBUS_READ_WORD, offsetof(struct acpi_battery, temp_now)},
 323         {0x09, SMBUS_READ_WORD, offsetof(struct acpi_battery, voltage_now)},
 324         {0x0a, SMBUS_READ_WORD, offsetof(struct acpi_battery, current_now)},
 325         {0x0b, SMBUS_READ_WORD, offsetof(struct acpi_battery, current_avg)},
 326         {0x0f, SMBUS_READ_WORD, offsetof(struct acpi_battery, capacity_now)},
 327         {0x0e, SMBUS_READ_WORD, offsetof(struct acpi_battery, state_of_charge)},
 328         {0x16, SMBUS_READ_WORD, offsetof(struct acpi_battery, state)},
 329 };
 330
 331 static int acpi_manager_get_info(struct acpi_sbs *sbs)
 332 {
 333         int result = 0;
 334         u16 battery_system_info;
 335
 336         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
 337                                  0x04, (u8 *)&battery_system_info);
 338         if (!result)
 339                 sbs->batteries_supported = battery_system_info & 0x000f;
 340         return result;
 341 }
 342
 343 static int acpi_battery_get_info(struct acpi_battery *battery)
 344 {
 345         int i, result = 0;
 346
 347         for (i = 0; i < ARRAY_SIZE(info_readers); ++i) {
 348                 result = acpi_smbus_read(battery->sbs->hc,
 349                                          info_readers[i].mode,
 350                                          ACPI_SBS_BATTERY,
 351                                          info_readers[i].command,
 352                                          (u8 *) battery +
 353                                                 info_readers[i].offset);
 354                 if (result)
 355                         break;
 356         }
 357         return result;
 358 }
 359
 360 static int acpi_battery_get_state(struct acpi_battery *battery)
 361 {
 362         int i, result = 0;
 363
 364         if (battery->update_time &&
 365             time_before(jiffies, battery->update_time +
 366                                 msecs_to_jiffies(cache_time)))
 367                 return 0;
 368         for (i = 0; i < ARRAY_SIZE(state_readers); ++i) {
 369                 result = acpi_smbus_read(battery->sbs->hc,
 370                                          state_readers[i].mode,
 371                                          ACPI_SBS_BATTERY,
 372                                          state_readers[i].command,
 373                                          (u8 *)battery +
 374                                                 state_readers[i].offset);
 375                 if (result)
 376                         goto end;
 377         }
 378       end:
 379         battery->update_time = jiffies;
 380         return result;
 381 }
 382
 383 static int acpi_battery_get_alarm(struct acpi_battery *battery)
 384 {
 385         return acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
 386                                  ACPI_SBS_BATTERY, 0x01,
 387                                  (u8 *)&battery->alarm_capacity);
 388 }
 389
 390 static int acpi_battery_set_alarm(struct acpi_battery *battery)
 391 {
 392         struct acpi_sbs *sbs = battery->sbs;
 393         u16 value, sel = 1 << (battery->id + 12);
 394
 395         int ret;
 396
 397
 398         if (sbs->manager_present) {
 399                 ret = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
 400                                 0x01, (u8 *)&value);
 401                 if (ret)
 402                         goto end;
 403                 if ((value & 0xf000) != sel) {
 404                         value &= 0x0fff;
 405                         value |= sel;
 406                 ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD,
 407                                          ACPI_SBS_MANAGER,
 408                                          0x01, (u8 *)&value, 2);
 409                 if (ret)
 410                         goto end;
 411                 }
 412         }
 413         ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD, ACPI_SBS_BATTERY,
 414                                 0x01, (u8 *)&battery->alarm_capacity, 2);
 415       end:
 416         return ret;
 417 }
 418
 419 static int acpi_ac_get_present(struct acpi_sbs *sbs)
 420 {
 421         int result;
 422         u16 status;
 423
 424         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_CHARGER,
 425                                  0x13, (u8 *) & status);
 426         if (!result)
 427                 sbs->charger_present = (status >> 15) & 0x1;
 428         return result;
 429 }
 430
 431 /* --------------------------------------------------------------------------
 432                               FS Interface (/proc/acpi)
 433    -------------------------------------------------------------------------- */
 434
 435 /* Generic Routines */
 436 static int
 437 acpi_sbs_add_fs(struct proc_dir_entry **dir,
 438                 struct proc_dir_entry *parent_dir,
 439                 char *dir_name,
 440                 struct file_operations *info_fops,
 441                 struct file_operations *state_fops,
 442                 struct file_operations *alarm_fops, void *data)
 443 {
 444         struct proc_dir_entry *entry = NULL;
 445
 446         if (!*dir) {
 447                 *dir = proc_mkdir(dir_name, parent_dir);
 448                 if (!*dir) {
 449                         return -ENODEV;
 450                 }
 451                 (*dir)->owner = THIS_MODULE;
 452         }
 453
 454         /* 'info' [R] */
 455         if (info_fops) {
 456                 entry = create_proc_entry(ACPI_SBS_FILE_INFO, S_IRUGO, *dir);
 457                 if (entry) {
 458                         entry->proc_fops = info_fops;
 459                         entry->data = data;
 460                         entry->owner = THIS_MODULE;
 461                 }
 462         }
 463
 464         /* 'state' [R] */
 465         if (state_fops) {
 466                 entry = create_proc_entry(ACPI_SBS_FILE_STATE, S_IRUGO, *dir);
 467                 if (entry) {
 468                         entry->proc_fops = state_fops;
 469                         entry->data = data;
 470                         entry->owner = THIS_MODULE;
 471                 }
 472         }
 473
 474         /* 'alarm' [R/W] */
 475         if (alarm_fops) {
 476                 entry = create_proc_entry(ACPI_SBS_FILE_ALARM, S_IRUGO, *dir);
 477                 if (entry) {
 478                         entry->proc_fops = alarm_fops;
 479                         entry->data = data;
 480                         entry->owner = THIS_MODULE;
 481                 }
 482         }
 483         return 0;
 484 }
 485
 486 static void
 487 acpi_sbs_remove_fs(struct proc_dir_entry **dir,
 488                            struct proc_dir_entry *parent_dir)
 489 {
 490         if (*dir) {
 491                 remove_proc_entry(ACPI_SBS_FILE_INFO, *dir);
 492                 remove_proc_entry(ACPI_SBS_FILE_STATE, *dir);
 493                 remove_proc_entry(ACPI_SBS_FILE_ALARM, *dir);
 494                 remove_proc_entry((*dir)->name, parent_dir);
 495                 *dir = NULL;
 496         }
 497 }
 498
 499 /* Smart Battery Interface */
 500 static struct proc_dir_entry *acpi_battery_dir = NULL;
 501
 502 static inline char *acpi_battery_units(struct acpi_battery *battery)
 503 {
 504         return acpi_battery_mode(battery) ? " mWh" : " mAh";
 505 }
 506
 507
 508 static int acpi_battery_read_info(struct seq_file *seq, void *offset)
 509 {
 510         struct acpi_battery *battery = seq->private;
 511         struct acpi_sbs *sbs = battery->sbs;
 512         int result = 0;
 513
 514         mutex_lock(&sbs->lock);
 515
 516         seq_printf(seq, "present:                 %s\n",
 517                    (battery->present) ? "yes" : "no");
 518         if (!battery->present)
 519                 goto end;
 520
 521         seq_printf(seq, "design capacity:         %i%s\n",
 522                    battery->design_capacity * acpi_battery_scale(battery),
 523                    acpi_battery_units(battery));
 524         seq_printf(seq, "last full capacity:      %i%s\n",
 525                    battery->full_charge_capacity * acpi_battery_scale(battery),
 526                    acpi_battery_units(battery));
 527         seq_printf(seq, "battery technology:      rechargeable\n");
 528         seq_printf(seq, "design voltage:          %i mV\n",
 529                    battery->design_voltage * acpi_battery_vscale(battery));
 530         seq_printf(seq, "design capacity warning: unknown\n");
 531         seq_printf(seq, "design capacity low:     unknown\n");
 532         seq_printf(seq, "capacity granularity 1:  unknown\n");
 533         seq_printf(seq, "capacity granularity 2:  unknown\n");
 534         seq_printf(seq, "model number:            %s\n", battery->device_name);
 535         seq_printf(seq, "serial number:           %i\n",
 536                    battery->serial_number);
 537         seq_printf(seq, "battery type:            %s\n",
 538                    battery->device_chemistry);
 539         seq_printf(seq, "OEM info:                %s\n",
 540                    battery->manufacturer_name);
 541       end:
 542         mutex_unlock(&sbs->lock);
 543         return result;
 544 }
 545
 546 static int acpi_battery_info_open_fs(struct inode *inode, struct file *file)
 547 {
 548         return single_open(file, acpi_battery_read_info, PDE(inode)->data);
 549 }
 550
 551 static int acpi_battery_read_state(struct seq_file *seq, void *offset)
 552 {
 553         struct acpi_battery *battery = seq->private;
 554         struct acpi_sbs *sbs = battery->sbs;
 555         int result = 0;
 556
 557         mutex_lock(&sbs->lock);
 558         seq_printf(seq, "present:                 %s\n",
 559                    (battery->present) ? "yes" : "no");
 560         if (!battery->present)
 561                 goto end;
 562
 563         acpi_battery_get_state(battery);
 564         seq_printf(seq, "capacity state:          %s\n",
 565                    (battery->state & 0x0010) ? "critical" : "ok");
 566         seq_printf(seq, "charging state:          %s\n",
 567                    (battery->current_now < 0) ? "discharging" :
 568                    ((battery->current_now > 0) ? "charging" : "charged"));
 569         seq_printf(seq, "present rate:            %d mA\n",
 570                    abs(battery->current_now) * acpi_battery_ipscale(battery));
 571         seq_printf(seq, "remaining capacity:      %i%s\n",
 572                    battery->capacity_now * acpi_battery_scale(battery),
 573                    acpi_battery_units(battery));
 574         seq_printf(seq, "present voltage:         %i mV\n",
 575                    battery->voltage_now * acpi_battery_vscale(battery));
 576
 577       end:
 578         mutex_unlock(&sbs->lock);
 579         return result;
 580 }
 581
 582 static int acpi_battery_state_open_fs(struct inode *inode, struct file *file)
 583 {
 584         return single_open(file, acpi_battery_read_state, PDE(inode)->data);
 585 }
 586
 587 static int acpi_battery_read_alarm(struct seq_file *seq, void *offset)
 588 {
 589         struct acpi_battery *battery = seq->private;
 590         struct acpi_sbs *sbs = battery->sbs;
 591         int result = 0;
 592
 593         mutex_lock(&sbs->lock);
 594
 595         if (!battery->present) {
 596                 seq_printf(seq, "present:                 no\n");
 597                 goto end;
 598         }
 599
 600         acpi_battery_get_alarm(battery);
 601         seq_printf(seq, "alarm:                   ");
 602         if (battery->alarm_capacity)
 603                 seq_printf(seq, "%i%s\n",
 604                            battery->alarm_capacity *
 605                            acpi_battery_scale(battery),
 606                            acpi_battery_units(battery));
 607         else
 608                 seq_printf(seq, "disabled\n");
 609       end:
 610         mutex_unlock(&sbs->lock);
 611         return result;
 612 }
 613
 614 static ssize_t
 615 acpi_battery_write_alarm(struct file *file, const char __user * buffer,
 616                          size_t count, loff_t * ppos)
 617 {
 618         struct seq_file *seq = file->private_data;
 619         struct acpi_battery *battery = seq->private;
 620         struct acpi_sbs *sbs = battery->sbs;
 621         char alarm_string[12] = { '\0' };
 622         int result = 0;
 623         mutex_lock(&sbs->lock);
 624         if (!battery->present) {
 625                 result = -ENODEV;
 626                 goto end;
 627         }
 628         if (count > sizeof(alarm_string) - 1) {
 629                 result = -EINVAL;
 630                 goto end;
 631         }
 632         if (copy_from_user(alarm_string, buffer, count)) {
 633                 result = -EFAULT;
 634                 goto end;
 635         }
 636         alarm_string[count] = 0;
 637         battery->alarm_capacity = simple_strtoul(alarm_string, NULL, 0) /
 638                                         acpi_battery_scale(battery);
 639         acpi_battery_set_alarm(battery);
 640       end:
 641         mutex_unlock(&sbs->lock);
 642         if (result)
 643                 return result;
 644         return count;
 645 }
 646
 647 static int acpi_battery_alarm_open_fs(struct inode *inode, struct file *file)
 648 {
 649         return single_open(file, acpi_battery_read_alarm, PDE(inode)->data);
 650 }
 651
 652 static struct file_operations acpi_battery_info_fops = {
 653         .open = acpi_battery_info_open_fs,
 654         .read = seq_read,
 655         .llseek = seq_lseek,
 656         .release = single_release,
 657         .owner = THIS_MODULE,
 658 };
 659
 660 static struct file_operations acpi_battery_state_fops = {
 661         .open = acpi_battery_state_open_fs,
 662         .read = seq_read,
 663         .llseek = seq_lseek,
 664         .release = single_release,
 665         .owner = THIS_MODULE,
 666 };
 667
 668 static struct file_operations acpi_battery_alarm_fops = {
 669         .open = acpi_battery_alarm_open_fs,
 670         .read = seq_read,
 671         .write = acpi_battery_write_alarm,
 672         .llseek = seq_lseek,
 673         .release = single_release,
 674         .owner = THIS_MODULE,
 675 };
 676
 677 /* Legacy AC Adapter Interface */
 678
 679 static struct proc_dir_entry *acpi_ac_dir = NULL;
 680
 681 static int acpi_ac_read_state(struct seq_file *seq, void *offset)
 682 {
 683
 684         struct acpi_sbs *sbs = seq->private;
 685
 686         mutex_lock(&sbs->lock);
 687
 688         seq_printf(seq, "state:                   %s\n",
 689                    sbs->charger_present ? "on-line" : "off-line");
 690
 691         mutex_unlock(&sbs->lock);
 692         return 0;
 693 }
 694
 695 static int acpi_ac_state_open_fs(struct inode *inode, struct file *file)
 696 {
 697         return single_open(file, acpi_ac_read_state, PDE(inode)->data);
 698 }
 699
 700 static struct file_operations acpi_ac_state_fops = {
 701         .open = acpi_ac_state_open_fs,
 702         .read = seq_read,
 703         .llseek = seq_lseek,
 704         .release = single_release,
 705         .owner = THIS_MODULE,
 706 };
 707
 708 /* --------------------------------------------------------------------------
 709                                  Driver Interface
 710    -------------------------------------------------------------------------- */
 711 static int acpi_battery_read(struct acpi_battery *battery)
 712 {
 713         int result = 0, saved_present = battery->present;
 714         u16 state;
 715
 716         if (battery->sbs->manager_present) {
 717                 result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
 718                                 ACPI_SBS_MANAGER, 0x01, (u8 *)&state);
 719                 if (!result)
 720                         battery->present = state & (1 << battery->id);
 721                 state &= 0x0fff;
 722                 state |= 1 << (battery->id + 12);
 723                 acpi_smbus_write(battery->sbs->hc, SMBUS_WRITE_WORD,
 724                                   ACPI_SBS_MANAGER, 0x01, (u8 *)&state, 2);
 725         } else if (battery->id == 0)
 726                 battery->present = 1;
 727         if (result || !battery->present)
 728                 return result;
 729
 730         if (saved_present != battery->present) {
 731                 battery->update_time = 0;
 732                 result = acpi_battery_get_info(battery);
 733                 if (result)
 734                         return result;
 735         }
 736         result = acpi_battery_get_state(battery);
 737         return result;
 738 }
 739
 740 /* Smart Battery */
 741 static int acpi_battery_add(struct acpi_sbs *sbs, int id)
 742 {
 743         struct acpi_battery *battery = &sbs->battery[id];
 744         int result;
 745
 746         battery->id = id;
 747         battery->sbs = sbs;
 748         result = acpi_battery_read(battery);
 749         if (result)
 750                 return result;
 751
 752         sprintf(battery->name, ACPI_BATTERY_DIR_NAME, id);
 753         acpi_sbs_add_fs(&battery->proc_entry, acpi_battery_dir,
 754                         battery->name, &acpi_battery_info_fops,
 755                         &acpi_battery_state_fops, &acpi_battery_alarm_fops,
 756                         battery);
 757         battery->bat.name = battery->name;
 758         battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
 759         if (!acpi_battery_mode(battery)) {
 760                 battery->bat.properties = sbs_charge_battery_props;
 761                 battery->bat.num_properties =
 762                     ARRAY_SIZE(sbs_charge_battery_props);
 763         } else {
 764                 battery->bat.properties = sbs_energy_battery_props;
 765                 battery->bat.num_properties =
 766                     ARRAY_SIZE(sbs_energy_battery_props);
 767         }
 768         battery->bat.get_property = acpi_sbs_battery_get_property;
 769         result = power_supply_register(&sbs->device->dev, &battery->bat);
 770         printk(KERN_INFO PREFIX "%s [%s]: Battery Slot [%s] (battery %s)\n",
 771                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
 772                battery->name, sbs->battery->present ? "present" : "absent");
 773         return result;
 774 }
 775
 776 static void acpi_battery_remove(struct acpi_sbs *sbs, int id)
 777 {
 778         if (sbs->battery[id].bat.dev)
 779                 power_supply_unregister(&sbs->battery[id].bat);
 780         if (sbs->battery[id].proc_entry) {
 781                 acpi_sbs_remove_fs(&(sbs->battery[id].proc_entry),
 782                                    acpi_battery_dir);
 783         }
 784 }
 785
 786 static int acpi_charger_add(struct acpi_sbs *sbs)
 787 {
 788         int result;
 789
 790         result = acpi_ac_get_present(sbs);
 791         if (result)
 792                 goto end;
 793         result = acpi_sbs_add_fs(&sbs->charger_entry, acpi_ac_dir,
 794                                  ACPI_AC_DIR_NAME, NULL,
 795                                  &acpi_ac_state_fops, NULL, sbs);
 796         if (result)
 797                 goto end;
 798         sbs->charger.name = "sbs-charger";
 799         sbs->charger.type = POWER_SUPPLY_TYPE_MAINS;
 800         sbs->charger.properties = sbs_ac_props;
 801         sbs->charger.num_properties = ARRAY_SIZE(sbs_ac_props);
 802         sbs->charger.get_property = sbs_get_ac_property;
 803         power_supply_register(&sbs->device->dev, &sbs->charger);
 804         printk(KERN_INFO PREFIX "%s [%s]: AC Adapter [%s] (%s)\n",
 805                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
 806                ACPI_AC_DIR_NAME, sbs->charger_present ? "on-line" : "off-line");
 807       end:
 808         return result;
 809 }
 810
 811 static void acpi_charger_remove(struct acpi_sbs *sbs)
 812 {
 813         if (sbs->charger.dev)
 814                 power_supply_unregister(&sbs->charger);
 815         if (sbs->charger_entry)
 816                 acpi_sbs_remove_fs(&sbs->charger_entry, acpi_ac_dir);
 817 }
 818
 819 void acpi_sbs_callback(void *context)
 820 {
 821         int id;
 822         struct acpi_sbs *sbs = context;
 823         struct acpi_battery *bat;
 824         u8 saved_charger_state = sbs->charger_present;
 825         u8 saved_battery_state;
 826         acpi_ac_get_present(sbs);
 827         if (sbs->charger_present != saved_charger_state) {
 828 #ifdef CONFIG_ACPI_PROC_EVENT
 829                 acpi_bus_generate_proc_event4(ACPI_AC_CLASS, ACPI_AC_DIR_NAME,
 830                                               ACPI_SBS_NOTIFY_STATUS,
 831                                               sbs->charger_present);
 832 #endif
 833                 kobject_uevent(&sbs->charger.dev->kobj, KOBJ_CHANGE);
 834         }
 835         if (sbs->manager_present) {
 836                 for (id = 0; id < MAX_SBS_BAT; ++id) {
 837                         if (!(sbs->batteries_supported & (1 << id)))
 838                                 continue;
 839                         bat = &sbs->battery[id];
 840                         saved_battery_state = bat->present;
 841                         acpi_battery_read(bat);
 842                         if (saved_battery_state == bat->present)
 843                                 continue;
 844 #ifdef CONFIG_ACPI_PROC_EVENT
 845                         acpi_bus_generate_proc_event4(ACPI_BATTERY_CLASS,
 846                                                       bat->name,
 847                                                       ACPI_SBS_NOTIFY_STATUS,
 848                                                       bat->present);
 849 #endif
 850                         kobject_uevent(&bat->bat.dev->kobj, KOBJ_CHANGE);
 851                 }
 852         }
 853 }
 854
 855 static int acpi_sbs_remove(struct acpi_device *device, int type);
 856
 857 static int acpi_sbs_add(struct acpi_device *device)
 858 {
 859         struct acpi_sbs *sbs;
 860         int result = 0;
 861         int id;
 862
 863         sbs = kzalloc(sizeof(struct acpi_sbs), GFP_KERNEL);
 864         if (!sbs) {
 865                 result = -ENOMEM;
 866                 goto end;
 867         }
 868
 869         mutex_init(&sbs->lock);
 870
 871         sbs->hc = acpi_driver_data(device->parent);
 872         sbs->device = device;
 873         strcpy(acpi_device_name(device), ACPI_SBS_DEVICE_NAME);
 874         strcpy(acpi_device_class(device), ACPI_SBS_CLASS);
 875         acpi_driver_data(device) = sbs;
 876
 877         result = acpi_charger_add(sbs);
 878         if (result)
 879                 goto end;
 880
 881         result = acpi_manager_get_info(sbs);
 882         if (!result) {
 883                 sbs->manager_present = 1;
 884                 for (id = 0; id < MAX_SBS_BAT; ++id)
 885                         if ((sbs->batteries_supported & (1 << id)))
 886                                 acpi_battery_add(sbs, id);
 887         } else
 888                 acpi_battery_add(sbs, 0);
 889         acpi_smbus_register_callback(sbs->hc, acpi_sbs_callback, sbs);
 890       end:
 891         if (result)
 892                 acpi_sbs_remove(device, 0);
 893         return result;
 894 }
 895
 896 static int acpi_sbs_remove(struct acpi_device *device, int type)
 897 {
 898         struct acpi_sbs *sbs;
 899         int id;
 900
 901         if (!device)
 902                 return -EINVAL;
 903         sbs = acpi_driver_data(device);
 904         if (!sbs)
 905                 return -EINVAL;
 906         mutex_lock(&sbs->lock);
 907         acpi_smbus_unregister_callback(sbs->hc);
 908         for (id = 0; id < MAX_SBS_BAT; ++id)
 909                 acpi_battery_remove(sbs, id);
 910         acpi_charger_remove(sbs);
 911         mutex_unlock(&sbs->lock);
 912         mutex_destroy(&sbs->lock);
 913         kfree(sbs);
 914         return 0;
 915 }
 916
 917 static void acpi_sbs_rmdirs(void)
 918 {
 919         if (acpi_ac_dir) {
 920                 acpi_unlock_ac_dir(acpi_ac_dir);
 921                 acpi_ac_dir = NULL;
 922         }
 923         if (acpi_battery_dir) {
 924                 acpi_unlock_battery_dir(acpi_battery_dir);
 925                 acpi_battery_dir = NULL;
 926         }
 927 }
 928
 929 static int acpi_sbs_resume(struct acpi_device *device)
 930 {
 931         struct acpi_sbs *sbs;
 932         if (!device)
 933                 return -EINVAL;
 934         sbs = device->driver_data;
 935         acpi_sbs_callback(sbs);
 936         return 0;
 937 }
 938
 939 static struct acpi_driver acpi_sbs_driver = {
 940         .name = "sbs",
 941         .class = ACPI_SBS_CLASS,
 942         .ids = sbs_device_ids,
 943         .ops = {
 944                 .add = acpi_sbs_add,
 945                 .remove = acpi_sbs_remove,
 946                 .resume = acpi_sbs_resume,
 947                 },
 948 };
 949
 950 static int __init acpi_sbs_init(void)
 951 {
 952         int result = 0;
 953
 954         if (acpi_disabled)
 955                 return -ENODEV;
 956         acpi_ac_dir = acpi_lock_ac_dir();
 957         if (!acpi_ac_dir)
 958                 return -ENODEV;
 959         acpi_battery_dir = acpi_lock_battery_dir();
 960         if (!acpi_battery_dir) {
 961                 acpi_sbs_rmdirs();
 962                 return -ENODEV;
 963         }
 964         result = acpi_bus_register_driver(&acpi_sbs_driver);
 965         if (result < 0) {
 966                 acpi_sbs_rmdirs();
 967                 return -ENODEV;
 968         }
 969         return 0;
 970 }
 971
 972 static void __exit acpi_sbs_exit(void)
 973 {
 974         acpi_bus_unregister_driver(&acpi_sbs_driver);
 975         acpi_sbs_rmdirs();
 976         return;
 977 }
 978
 979 module_init(acpi_sbs_init);
 980 module_exit(acpi_sbs_exit);