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