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 #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, .owner = THIS_MODULE},
 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         struct proc_dir_entry *entry = NULL;
 487
 488         if (!*dir) {
 489                 *dir = proc_mkdir(dir_name, parent_dir);
 490                 if (!*dir) {
 491                         return -ENODEV;
 492                 }
 493                 (*dir)->owner = THIS_MODULE;
 494         }
 495
 496         /* 'info' [R] */
 497         if (info_fops) {
 498                 entry = create_proc_entry(ACPI_SBS_FILE_INFO, S_IRUGO, *dir);
 499                 if (entry) {
 500                         entry->proc_fops = info_fops;
 501                         entry->data = data;
 502                         entry->owner = THIS_MODULE;
 503                 }
 504         }
 505
 506         /* 'state' [R] */
 507         if (state_fops) {
 508                 entry = create_proc_entry(ACPI_SBS_FILE_STATE, S_IRUGO, *dir);
 509                 if (entry) {
 510                         entry->proc_fops = state_fops;
 511                         entry->data = data;
 512                         entry->owner = THIS_MODULE;
 513                 }
 514         }
 515
 516         /* 'alarm' [R/W] */
 517         if (alarm_fops) {
 518                 entry = create_proc_entry(ACPI_SBS_FILE_ALARM, S_IRUGO, *dir);
 519                 if (entry) {
 520                         entry->proc_fops = alarm_fops;
 521                         entry->data = data;
 522                         entry->owner = THIS_MODULE;
 523                 }
 524         }
 525         return 0;
 526 }
 527
 528 static void
 529 acpi_sbs_remove_fs(struct proc_dir_entry **dir,
 530                            struct proc_dir_entry *parent_dir)
 531 {
 532         if (*dir) {
 533                 remove_proc_entry(ACPI_SBS_FILE_INFO, *dir);
 534                 remove_proc_entry(ACPI_SBS_FILE_STATE, *dir);
 535                 remove_proc_entry(ACPI_SBS_FILE_ALARM, *dir);
 536                 remove_proc_entry((*dir)->name, parent_dir);
 537                 *dir = NULL;
 538         }
 539 }
 540
 541 /* Smart Battery Interface */
 542 static struct proc_dir_entry *acpi_battery_dir = NULL;
 543
 544 static inline char *acpi_battery_units(struct acpi_battery *battery)
 545 {
 546         return acpi_battery_mode(battery) ? " mW" : " mA";
 547 }
 548
 549
 550 static int acpi_battery_read_info(struct seq_file *seq, void *offset)
 551 {
 552         struct acpi_battery *battery = seq->private;
 553         struct acpi_sbs *sbs = battery->sbs;
 554         int result = 0;
 555
 556         mutex_lock(&sbs->lock);
 557
 558         seq_printf(seq, "present:                 %s\n",
 559                    (battery->present) ? "yes" : "no");
 560         if (!battery->present)
 561                 goto end;
 562
 563         seq_printf(seq, "design capacity:         %i%sh\n",
 564                    battery->design_capacity * acpi_battery_scale(battery),
 565                    acpi_battery_units(battery));
 566         seq_printf(seq, "last full capacity:      %i%sh\n",
 567                    battery->full_charge_capacity * acpi_battery_scale(battery),
 568                    acpi_battery_units(battery));
 569         seq_printf(seq, "battery technology:      rechargeable\n");
 570         seq_printf(seq, "design voltage:          %i mV\n",
 571                    battery->design_voltage * acpi_battery_vscale(battery));
 572         seq_printf(seq, "design capacity warning: unknown\n");
 573         seq_printf(seq, "design capacity low:     unknown\n");
 574         seq_printf(seq, "capacity granularity 1:  unknown\n");
 575         seq_printf(seq, "capacity granularity 2:  unknown\n");
 576         seq_printf(seq, "model number:            %s\n", battery->device_name);
 577         seq_printf(seq, "serial number:           %i\n",
 578                    battery->serial_number);
 579         seq_printf(seq, "battery type:            %s\n",
 580                    battery->device_chemistry);
 581         seq_printf(seq, "OEM info:                %s\n",
 582                    battery->manufacturer_name);
 583       end:
 584         mutex_unlock(&sbs->lock);
 585         return result;
 586 }
 587
 588 static int acpi_battery_info_open_fs(struct inode *inode, struct file *file)
 589 {
 590         return single_open(file, acpi_battery_read_info, PDE(inode)->data);
 591 }
 592
 593 static int acpi_battery_read_state(struct seq_file *seq, void *offset)
 594 {
 595         struct acpi_battery *battery = seq->private;
 596         struct acpi_sbs *sbs = battery->sbs;
 597         int rate;
 598
 599         mutex_lock(&sbs->lock);
 600         seq_printf(seq, "present:                 %s\n",
 601                    (battery->present) ? "yes" : "no");
 602         if (!battery->present)
 603                 goto end;
 604
 605         acpi_battery_get_state(battery);
 606         seq_printf(seq, "capacity state:          %s\n",
 607                    (battery->state & 0x0010) ? "critical" : "ok");
 608         seq_printf(seq, "charging state:          %s\n",
 609                    (battery->current_now < 0) ? "discharging" :
 610                    ((battery->current_now > 0) ? "charging" : "charged"));
 611         rate = abs(battery->current_now) * acpi_battery_ipscale(battery);
 612         rate *= (acpi_battery_mode(battery))?(battery->voltage_now *
 613                         acpi_battery_vscale(battery)/1000):1;
 614         seq_printf(seq, "present rate:            %d%s\n", rate,
 615                    acpi_battery_units(battery));
 616         seq_printf(seq, "remaining capacity:      %i%sh\n",
 617                    battery->capacity_now * acpi_battery_scale(battery),
 618                    acpi_battery_units(battery));
 619         seq_printf(seq, "present voltage:         %i mV\n",
 620                    battery->voltage_now * acpi_battery_vscale(battery));
 621
 622       end:
 623         mutex_unlock(&sbs->lock);
 624         return 0;
 625 }
 626
 627 static int acpi_battery_state_open_fs(struct inode *inode, struct file *file)
 628 {
 629         return single_open(file, acpi_battery_read_state, PDE(inode)->data);
 630 }
 631
 632 static int acpi_battery_read_alarm(struct seq_file *seq, void *offset)
 633 {
 634         struct acpi_battery *battery = seq->private;
 635         struct acpi_sbs *sbs = battery->sbs;
 636         int result = 0;
 637
 638         mutex_lock(&sbs->lock);
 639
 640         if (!battery->present) {
 641                 seq_printf(seq, "present:                 no\n");
 642                 goto end;
 643         }
 644
 645         acpi_battery_get_alarm(battery);
 646         seq_printf(seq, "alarm:                   ");
 647         if (battery->alarm_capacity)
 648                 seq_printf(seq, "%i%sh\n",
 649                            battery->alarm_capacity *
 650                            acpi_battery_scale(battery),
 651                            acpi_battery_units(battery));
 652         else
 653                 seq_printf(seq, "disabled\n");
 654       end:
 655         mutex_unlock(&sbs->lock);
 656         return result;
 657 }
 658
 659 static ssize_t
 660 acpi_battery_write_alarm(struct file *file, const char __user * buffer,
 661                          size_t count, loff_t * ppos)
 662 {
 663         struct seq_file *seq = file->private_data;
 664         struct acpi_battery *battery = seq->private;
 665         struct acpi_sbs *sbs = battery->sbs;
 666         char alarm_string[12] = { '\0' };
 667         int result = 0;
 668         mutex_lock(&sbs->lock);
 669         if (!battery->present) {
 670                 result = -ENODEV;
 671                 goto end;
 672         }
 673         if (count > sizeof(alarm_string) - 1) {
 674                 result = -EINVAL;
 675                 goto end;
 676         }
 677         if (copy_from_user(alarm_string, buffer, count)) {
 678                 result = -EFAULT;
 679                 goto end;
 680         }
 681         alarm_string[count] = 0;
 682         battery->alarm_capacity = simple_strtoul(alarm_string, NULL, 0) /
 683                                         acpi_battery_scale(battery);
 684         acpi_battery_set_alarm(battery);
 685       end:
 686         mutex_unlock(&sbs->lock);
 687         if (result)
 688                 return result;
 689         return count;
 690 }
 691
 692 static int acpi_battery_alarm_open_fs(struct inode *inode, struct file *file)
 693 {
 694         return single_open(file, acpi_battery_read_alarm, PDE(inode)->data);
 695 }
 696
 697 static struct file_operations acpi_battery_info_fops = {
 698         .open = acpi_battery_info_open_fs,
 699         .read = seq_read,
 700         .llseek = seq_lseek,
 701         .release = single_release,
 702         .owner = THIS_MODULE,
 703 };
 704
 705 static struct file_operations acpi_battery_state_fops = {
 706         .open = acpi_battery_state_open_fs,
 707         .read = seq_read,
 708         .llseek = seq_lseek,
 709         .release = single_release,
 710         .owner = THIS_MODULE,
 711 };
 712
 713 static struct file_operations acpi_battery_alarm_fops = {
 714         .open = acpi_battery_alarm_open_fs,
 715         .read = seq_read,
 716         .write = acpi_battery_write_alarm,
 717         .llseek = seq_lseek,
 718         .release = single_release,
 719         .owner = THIS_MODULE,
 720 };
 721
 722 /* Legacy AC Adapter Interface */
 723
 724 static struct proc_dir_entry *acpi_ac_dir = NULL;
 725
 726 static int acpi_ac_read_state(struct seq_file *seq, void *offset)
 727 {
 728
 729         struct acpi_sbs *sbs = seq->private;
 730
 731         mutex_lock(&sbs->lock);
 732
 733         seq_printf(seq, "state:                   %s\n",
 734                    sbs->charger_present ? "on-line" : "off-line");
 735
 736         mutex_unlock(&sbs->lock);
 737         return 0;
 738 }
 739
 740 static int acpi_ac_state_open_fs(struct inode *inode, struct file *file)
 741 {
 742         return single_open(file, acpi_ac_read_state, PDE(inode)->data);
 743 }
 744
 745 static struct file_operations acpi_ac_state_fops = {
 746         .open = acpi_ac_state_open_fs,
 747         .read = seq_read,
 748         .llseek = seq_lseek,
 749         .release = single_release,
 750         .owner = THIS_MODULE,
 751 };
 752
 753 #endif
 754
 755 /* --------------------------------------------------------------------------
 756                                  Driver Interface
 757    -------------------------------------------------------------------------- */
 758 static int acpi_battery_read(struct acpi_battery *battery)
 759 {
 760         int result = 0, saved_present = battery->present;
 761         u16 state;
 762
 763         if (battery->sbs->manager_present) {
 764                 result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
 765                                 ACPI_SBS_MANAGER, 0x01, (u8 *)&state);
 766                 if (!result)
 767                         battery->present = state & (1 << battery->id);
 768                 state &= 0x0fff;
 769                 state |= 1 << (battery->id + 12);
 770                 acpi_smbus_write(battery->sbs->hc, SMBUS_WRITE_WORD,
 771                                   ACPI_SBS_MANAGER, 0x01, (u8 *)&state, 2);
 772         } else if (battery->id == 0)
 773                 battery->present = 1;
 774         if (result || !battery->present)
 775                 return result;
 776
 777         if (saved_present != battery->present) {
 778                 battery->update_time = 0;
 779                 result = acpi_battery_get_info(battery);
 780                 if (result)
 781                         return result;
 782         }
 783         result = acpi_battery_get_state(battery);
 784         return result;
 785 }
 786
 787 /* Smart Battery */
 788 static int acpi_battery_add(struct acpi_sbs *sbs, int id)
 789 {
 790         struct acpi_battery *battery = &sbs->battery[id];
 791         int result;
 792
 793         battery->id = id;
 794         battery->sbs = sbs;
 795         result = acpi_battery_read(battery);
 796         if (result)
 797                 return result;
 798
 799         sprintf(battery->name, ACPI_BATTERY_DIR_NAME, id);
 800 #ifdef CONFIG_ACPI_PROCFS_POWER
 801         acpi_sbs_add_fs(&battery->proc_entry, acpi_battery_dir,
 802                         battery->name, &acpi_battery_info_fops,
 803                         &acpi_battery_state_fops, &acpi_battery_alarm_fops,
 804                         battery);
 805 #endif
 806 #ifdef CONFIG_ACPI_SYSFS_POWER
 807         battery->bat.name = battery->name;
 808         battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
 809         if (!acpi_battery_mode(battery)) {
 810                 battery->bat.properties = sbs_charge_battery_props;
 811                 battery->bat.num_properties =
 812                     ARRAY_SIZE(sbs_charge_battery_props);
 813         } else {
 814                 battery->bat.properties = sbs_energy_battery_props;
 815                 battery->bat.num_properties =
 816                     ARRAY_SIZE(sbs_energy_battery_props);
 817         }
 818         battery->bat.get_property = acpi_sbs_battery_get_property;
 819         result = power_supply_register(&sbs->device->dev, &battery->bat);
 820         if (result)
 821                 goto end;
 822         result = device_create_file(battery->bat.dev, &alarm_attr);
 823         if (result)
 824                 goto end;
 825         battery->have_sysfs_alarm = 1;
 826       end:
 827 #endif
 828         printk(KERN_INFO PREFIX "%s [%s]: Battery Slot [%s] (battery %s)\n",
 829                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
 830                battery->name, sbs->battery->present ? "present" : "absent");
 831         return result;
 832 }
 833
 834 static void acpi_battery_remove(struct acpi_sbs *sbs, int id)
 835 {
 836         struct acpi_battery *battery = &sbs->battery[id];
 837 #ifdef CONFIG_ACPI_SYSFS_POWER
 838         if (battery->bat.dev) {
 839                 if (battery->have_sysfs_alarm)
 840                         device_remove_file(battery->bat.dev, &alarm_attr);
 841                 power_supply_unregister(&battery->bat);
 842         }
 843 #endif
 844 #ifdef CONFIG_ACPI_PROCFS_POWER
 845         if (battery->proc_entry)
 846                 acpi_sbs_remove_fs(&battery->proc_entry, acpi_battery_dir);
 847 #endif
 848 }
 849
 850 static int acpi_charger_add(struct acpi_sbs *sbs)
 851 {
 852         int result;
 853
 854         result = acpi_ac_get_present(sbs);
 855         if (result)
 856                 goto end;
 857 #ifdef CONFIG_ACPI_PROCFS_POWER
 858         result = acpi_sbs_add_fs(&sbs->charger_entry, acpi_ac_dir,
 859                                  ACPI_AC_DIR_NAME, NULL,
 860                                  &acpi_ac_state_fops, NULL, sbs);
 861         if (result)
 862                 goto end;
 863 #endif
 864 #ifdef CONFIG_ACPI_SYSFS_POWER
 865         sbs->charger.name = "sbs-charger";
 866         sbs->charger.type = POWER_SUPPLY_TYPE_MAINS;
 867         sbs->charger.properties = sbs_ac_props;
 868         sbs->charger.num_properties = ARRAY_SIZE(sbs_ac_props);
 869         sbs->charger.get_property = sbs_get_ac_property;
 870         power_supply_register(&sbs->device->dev, &sbs->charger);
 871 #endif
 872         printk(KERN_INFO PREFIX "%s [%s]: AC Adapter [%s] (%s)\n",
 873                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
 874                ACPI_AC_DIR_NAME, sbs->charger_present ? "on-line" : "off-line");
 875       end:
 876         return result;
 877 }
 878
 879 static void acpi_charger_remove(struct acpi_sbs *sbs)
 880 {
 881 #ifdef CONFIG_ACPI_SYSFS_POWER
 882         if (sbs->charger.dev)
 883                 power_supply_unregister(&sbs->charger);
 884 #endif
 885 #ifdef CONFIG_ACPI_PROCFS_POWER
 886         if (sbs->charger_entry)
 887                 acpi_sbs_remove_fs(&sbs->charger_entry, acpi_ac_dir);
 888 #endif
 889 }
 890
 891 void acpi_sbs_callback(void *context)
 892 {
 893         int id;
 894         struct acpi_sbs *sbs = context;
 895         struct acpi_battery *bat;
 896         u8 saved_charger_state = sbs->charger_present;
 897         u8 saved_battery_state;
 898         acpi_ac_get_present(sbs);
 899         if (sbs->charger_present != saved_charger_state) {
 900 #ifdef CONFIG_ACPI_PROC_EVENT
 901                 acpi_bus_generate_proc_event4(ACPI_AC_CLASS, ACPI_AC_DIR_NAME,
 902                                               ACPI_SBS_NOTIFY_STATUS,
 903                                               sbs->charger_present);
 904 #endif
 905 #ifdef CONFIG_ACPI_SYSFS_POWER
 906                 kobject_uevent(&sbs->charger.dev->kobj, KOBJ_CHANGE);
 907 #endif
 908         }
 909         if (sbs->manager_present) {
 910                 for (id = 0; id < MAX_SBS_BAT; ++id) {
 911                         if (!(sbs->batteries_supported & (1 << id)))
 912                                 continue;
 913                         bat = &sbs->battery[id];
 914                         saved_battery_state = bat->present;
 915                         acpi_battery_read(bat);
 916                         if (saved_battery_state == bat->present)
 917                                 continue;
 918 #ifdef CONFIG_ACPI_PROC_EVENT
 919                         acpi_bus_generate_proc_event4(ACPI_BATTERY_CLASS,
 920                                                       bat->name,
 921                                                       ACPI_SBS_NOTIFY_STATUS,
 922                                                       bat->present);
 923 #endif
 924 #ifdef CONFIG_ACPI_SYSFS_POWER
 925                         kobject_uevent(&bat->bat.dev->kobj, KOBJ_CHANGE);
 926 #endif
 927                 }
 928         }
 929 }
 930
 931 static int acpi_sbs_remove(struct acpi_device *device, int type);
 932
 933 static int acpi_sbs_add(struct acpi_device *device)
 934 {
 935         struct acpi_sbs *sbs;
 936         int result = 0;
 937         int id;
 938
 939         sbs = kzalloc(sizeof(struct acpi_sbs), GFP_KERNEL);
 940         if (!sbs) {
 941                 result = -ENOMEM;
 942                 goto end;
 943         }
 944
 945         mutex_init(&sbs->lock);
 946
 947         sbs->hc = acpi_driver_data(device->parent);
 948         sbs->device = device;
 949         strcpy(acpi_device_name(device), ACPI_SBS_DEVICE_NAME);
 950         strcpy(acpi_device_class(device), ACPI_SBS_CLASS);
 951         acpi_driver_data(device) = sbs;
 952
 953         result = acpi_charger_add(sbs);
 954         if (result)
 955                 goto end;
 956
 957         result = acpi_manager_get_info(sbs);
 958         if (!result) {
 959                 sbs->manager_present = 1;
 960                 for (id = 0; id < MAX_SBS_BAT; ++id)
 961                         if ((sbs->batteries_supported & (1 << id)))
 962                                 acpi_battery_add(sbs, id);
 963         } else
 964                 acpi_battery_add(sbs, 0);
 965         acpi_smbus_register_callback(sbs->hc, acpi_sbs_callback, sbs);
 966       end:
 967         if (result)
 968                 acpi_sbs_remove(device, 0);
 969         return result;
 970 }
 971
 972 static int acpi_sbs_remove(struct acpi_device *device, int type)
 973 {
 974         struct acpi_sbs *sbs;
 975         int id;
 976
 977         if (!device)
 978                 return -EINVAL;
 979         sbs = acpi_driver_data(device);
 980         if (!sbs)
 981                 return -EINVAL;
 982         mutex_lock(&sbs->lock);
 983         acpi_smbus_unregister_callback(sbs->hc);
 984         for (id = 0; id < MAX_SBS_BAT; ++id)
 985                 acpi_battery_remove(sbs, id);
 986         acpi_charger_remove(sbs);
 987         mutex_unlock(&sbs->lock);
 988         mutex_destroy(&sbs->lock);
 989         kfree(sbs);
 990         return 0;
 991 }
 992
 993 static void acpi_sbs_rmdirs(void)
 994 {
 995 #ifdef CONFIG_ACPI_PROCFS_POWER
 996         if (acpi_ac_dir) {
 997                 acpi_unlock_ac_dir(acpi_ac_dir);
 998                 acpi_ac_dir = NULL;
 999         }
1000         if (acpi_battery_dir) {
1001                 acpi_unlock_battery_dir(acpi_battery_dir);
1002                 acpi_battery_dir = NULL;
1003         }
1004 #endif
1005 }
1006
1007 static int acpi_sbs_resume(struct acpi_device *device)
1008 {
1009         struct acpi_sbs *sbs;
1010         if (!device)
1011                 return -EINVAL;
1012         sbs = device->driver_data;
1013         acpi_sbs_callback(sbs);
1014         return 0;
1015 }
1016
1017 static struct acpi_driver acpi_sbs_driver = {
1018         .name = "sbs",
1019         .class = ACPI_SBS_CLASS,
1020         .ids = sbs_device_ids,
1021         .ops = {
1022                 .add = acpi_sbs_add,
1023                 .remove = acpi_sbs_remove,
1024                 .resume = acpi_sbs_resume,
1025                 },
1026 };
1027
1028 static int __init acpi_sbs_init(void)
1029 {
1030         int result = 0;
1031
1032         if (acpi_disabled)
1033                 return -ENODEV;
1034 #ifdef CONFIG_ACPI_PROCFS_POWER
1035         acpi_ac_dir = acpi_lock_ac_dir();
1036         if (!acpi_ac_dir)
1037                 return -ENODEV;
1038         acpi_battery_dir = acpi_lock_battery_dir();
1039         if (!acpi_battery_dir) {
1040                 acpi_sbs_rmdirs();
1041                 return -ENODEV;
1042         }
1043 #endif
1044         result = acpi_bus_register_driver(&acpi_sbs_driver);
1045         if (result < 0) {
1046                 acpi_sbs_rmdirs();
1047                 return -ENODEV;
1048         }
1049         return 0;
1050 }
1051
1052 static void __exit acpi_sbs_exit(void)
1053 {
1054         acpi_bus_unregister_driver(&acpi_sbs_driver);
1055         acpi_sbs_rmdirs();
1056         return;
1057 }
1058
1059 module_init(acpi_sbs_init);
1060 module_exit(acpi_sbs_exit);