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