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