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/slab.h>
  29 #include <linux/module.h>
  30 #include <linux/moduleparam.h>
  31 #include <linux/kernel.h>
  32
  33 #ifdef CONFIG_ACPI_PROCFS_POWER
  34 #include <linux/proc_fs.h>
  35 #include <linux/seq_file.h>
  36 #include <asm/uaccess.h>
  37 #endif
  38
  39 #include <linux/acpi.h>
  40 #include <linux/timer.h>
  41 #include <linux/jiffies.h>
  42 #include <linux/delay.h>
  43
  44 #ifdef CONFIG_ACPI_SYSFS_POWER
  45 #include <linux/power_supply.h>
  46 #endif
  47
  48 #include "sbshc.h"
  49
  50 #define PREFIX "ACPI: "
  51
  52 #define ACPI_SBS_CLASS                  "sbs"
  53 #define ACPI_AC_CLASS                   "ac_adapter"
  54 #define ACPI_BATTERY_CLASS              "battery"
  55 #define ACPI_SBS_DEVICE_NAME            "Smart Battery System"
  56 #define ACPI_SBS_FILE_INFO              "info"
  57 #define ACPI_SBS_FILE_STATE             "state"
  58 #define ACPI_SBS_FILE_ALARM             "alarm"
  59 #define ACPI_BATTERY_DIR_NAME           "BAT%i"
  60 #define ACPI_AC_DIR_NAME                "AC0"
  61
  62 #define ACPI_SBS_NOTIFY_STATUS          0x80
  63 #define ACPI_SBS_NOTIFY_INFO            0x81
  64
  65 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
  66 MODULE_DESCRIPTION("Smart Battery System ACPI interface driver");
  67 MODULE_LICENSE("GPL");
  68
  69 static unsigned int cache_time = 1000;
  70 module_param(cache_time, uint, 0644);
  71 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
  72
  73 extern struct proc_dir_entry *acpi_lock_ac_dir(void);
  74 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
  75 extern void acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
  76 extern void acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
  77
  78 #define MAX_SBS_BAT                     4
  79 #define ACPI_SBS_BLOCK_MAX              32
  80
  81 static const struct acpi_device_id sbs_device_ids[] = {
  82         {"ACPI0002", 0},
  83         {"", 0},
  84 };
  85 MODULE_DEVICE_TABLE(acpi, sbs_device_ids);
  86
  87 struct acpi_battery {
  88 #ifdef CONFIG_ACPI_SYSFS_POWER
  89         struct power_supply bat;
  90 #endif
  91         struct acpi_sbs *sbs;
  92 #ifdef CONFIG_ACPI_PROCFS_POWER
  93         struct proc_dir_entry *proc_entry;
  94 #endif
  95         unsigned long update_time;
  96         char name[8];
  97         char manufacturer_name[ACPI_SBS_BLOCK_MAX];
  98         char device_name[ACPI_SBS_BLOCK_MAX];
  99         char device_chemistry[ACPI_SBS_BLOCK_MAX];
 100         u16 alarm_capacity;
 101         u16 full_charge_capacity;
 102         u16 design_capacity;
 103         u16 design_voltage;
 104         u16 serial_number;
 105         u16 cycle_count;
 106         u16 temp_now;
 107         u16 voltage_now;
 108         s16 rate_now;
 109         s16 rate_avg;
 110         u16 capacity_now;
 111         u16 state_of_charge;
 112         u16 state;
 113         u16 mode;
 114         u16 spec;
 115         u8 id;
 116         u8 present:1;
 117         u8 have_sysfs_alarm:1;
 118 };
 119
 120 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
 121
 122 struct acpi_sbs {
 123 #ifdef CONFIG_ACPI_SYSFS_POWER
 124         struct power_supply charger;
 125 #endif
 126         struct acpi_device *device;
 127         struct acpi_smb_hc *hc;
 128         struct mutex lock;
 129 #ifdef CONFIG_ACPI_PROCFS_POWER
 130         struct proc_dir_entry *charger_entry;
 131 #endif
 132         struct acpi_battery battery[MAX_SBS_BAT];
 133         u8 batteries_supported:4;
 134         u8 manager_present:1;
 135         u8 charger_present:1;
 136 };
 137
 138 #define to_acpi_sbs(x) container_of(x, struct acpi_sbs, charger)
 139
 140 static inline int battery_scale(int log)
 141 {
 142         int scale = 1;
 143         while (log--)
 144                 scale *= 10;
 145         return scale;
 146 }
 147
 148 static inline int acpi_battery_vscale(struct acpi_battery *battery)
 149 {
 150         return battery_scale((battery->spec & 0x0f00) >> 8);
 151 }
 152
 153 static inline int acpi_battery_ipscale(struct acpi_battery *battery)
 154 {
 155         return battery_scale((battery->spec & 0xf000) >> 12);
 156 }
 157
 158 static inline int acpi_battery_mode(struct acpi_battery *battery)
 159 {
 160         return (battery->mode & 0x8000);
 161 }
 162
 163 static inline int acpi_battery_scale(struct acpi_battery *battery)
 164 {
 165         return (acpi_battery_mode(battery) ? 10 : 1) *
 166             acpi_battery_ipscale(battery);
 167 }
 168
 169 #ifdef CONFIG_ACPI_SYSFS_POWER
 170 static int sbs_get_ac_property(struct power_supply *psy,
 171                                enum power_supply_property psp,
 172                                union power_supply_propval *val)
 173 {
 174         struct acpi_sbs *sbs = to_acpi_sbs(psy);
 175         switch (psp) {
 176         case POWER_SUPPLY_PROP_ONLINE:
 177                 val->intval = sbs->charger_present;
 178                 break;
 179         default:
 180                 return -EINVAL;
 181         }
 182         return 0;
 183 }
 184
 185 static int acpi_battery_technology(struct acpi_battery *battery)
 186 {
 187         if (!strcasecmp("NiCd", battery->device_chemistry))
 188                 return POWER_SUPPLY_TECHNOLOGY_NiCd;
 189         if (!strcasecmp("NiMH", battery->device_chemistry))
 190                 return POWER_SUPPLY_TECHNOLOGY_NiMH;
 191         if (!strcasecmp("LION", battery->device_chemistry))
 192                 return POWER_SUPPLY_TECHNOLOGY_LION;
 193         if (!strcasecmp("LiP", battery->device_chemistry))
 194                 return POWER_SUPPLY_TECHNOLOGY_LIPO;
 195         return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 196 }
 197
 198 static int acpi_sbs_battery_get_property(struct power_supply *psy,
 199                                          enum power_supply_property psp,
 200                                          union power_supply_propval *val)
 201 {
 202         struct acpi_battery *battery = to_acpi_battery(psy);
 203
 204         if ((!battery->present) && psp != POWER_SUPPLY_PROP_PRESENT)
 205                 return -ENODEV;
 206         switch (psp) {
 207         case POWER_SUPPLY_PROP_STATUS:
 208                 if (battery->rate_now < 0)
 209                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 210                 else if (battery->rate_now > 0)
 211                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 212                 else
 213                         val->intval = POWER_SUPPLY_STATUS_FULL;
 214                 break;
 215         case POWER_SUPPLY_PROP_PRESENT:
 216                 val->intval = battery->present;
 217                 break;
 218         case POWER_SUPPLY_PROP_TECHNOLOGY:
 219                 val->intval = acpi_battery_technology(battery);
 220                 break;
 221         case POWER_SUPPLY_PROP_CYCLE_COUNT:
 222                 val->intval = battery->cycle_count;
 223                 break;
 224         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 225                 val->intval = battery->design_voltage *
 226                         acpi_battery_vscale(battery) * 1000;
 227                 break;
 228         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 229                 val->intval = battery->voltage_now *
 230                                 acpi_battery_vscale(battery) * 1000;
 231                 break;
 232         case POWER_SUPPLY_PROP_CURRENT_NOW:
 233         case POWER_SUPPLY_PROP_POWER_NOW:
 234                 val->intval = abs(battery->rate_now) *
 235                                 acpi_battery_ipscale(battery) * 1000;
 236                 break;
 237         case POWER_SUPPLY_PROP_CURRENT_AVG:
 238         case POWER_SUPPLY_PROP_POWER_AVG:
 239                 val->intval = abs(battery->rate_avg) *
 240                                 acpi_battery_ipscale(battery) * 1000;
 241                 break;
 242         case POWER_SUPPLY_PROP_CAPACITY:
 243                 val->intval = battery->state_of_charge;
 244                 break;
 245         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 246         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 247                 val->intval = battery->design_capacity *
 248                         acpi_battery_scale(battery) * 1000;
 249                 break;
 250         case POWER_SUPPLY_PROP_CHARGE_FULL:
 251         case POWER_SUPPLY_PROP_ENERGY_FULL:
 252                 val->intval = battery->full_charge_capacity *
 253                         acpi_battery_scale(battery) * 1000;
 254                 break;
 255         case POWER_SUPPLY_PROP_CHARGE_NOW:
 256         case POWER_SUPPLY_PROP_ENERGY_NOW:
 257                 val->intval = battery->capacity_now *
 258                                 acpi_battery_scale(battery) * 1000;
 259                 break;
 260         case POWER_SUPPLY_PROP_TEMP:
 261                 val->intval = battery->temp_now - 2730; // dK -> dC
 262                 break;
 263         case POWER_SUPPLY_PROP_MODEL_NAME:
 264                 val->strval = battery->device_name;
 265                 break;
 266         case POWER_SUPPLY_PROP_MANUFACTURER:
 267                 val->strval = battery->manufacturer_name;
 268                 break;
 269         default:
 270                 return -EINVAL;
 271         }
 272         return 0;
 273 }
 274
 275 static enum power_supply_property sbs_ac_props[] = {
 276         POWER_SUPPLY_PROP_ONLINE,
 277 };
 278
 279 static enum power_supply_property sbs_charge_battery_props[] = {
 280         POWER_SUPPLY_PROP_STATUS,
 281         POWER_SUPPLY_PROP_PRESENT,
 282         POWER_SUPPLY_PROP_TECHNOLOGY,
 283         POWER_SUPPLY_PROP_CYCLE_COUNT,
 284         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 285         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 286         POWER_SUPPLY_PROP_CURRENT_NOW,
 287         POWER_SUPPLY_PROP_CURRENT_AVG,
 288         POWER_SUPPLY_PROP_CAPACITY,
 289         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 290         POWER_SUPPLY_PROP_CHARGE_FULL,
 291         POWER_SUPPLY_PROP_CHARGE_NOW,
 292         POWER_SUPPLY_PROP_TEMP,
 293         POWER_SUPPLY_PROP_MODEL_NAME,
 294         POWER_SUPPLY_PROP_MANUFACTURER,
 295 };
 296
 297 static enum power_supply_property sbs_energy_battery_props[] = {
 298         POWER_SUPPLY_PROP_STATUS,
 299         POWER_SUPPLY_PROP_PRESENT,
 300         POWER_SUPPLY_PROP_TECHNOLOGY,
 301         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 302         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 303         POWER_SUPPLY_PROP_CURRENT_NOW,
 304         POWER_SUPPLY_PROP_CURRENT_AVG,
 305         POWER_SUPPLY_PROP_POWER_NOW,
 306         POWER_SUPPLY_PROP_POWER_AVG,
 307         POWER_SUPPLY_PROP_CAPACITY,
 308         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 309         POWER_SUPPLY_PROP_ENERGY_FULL,
 310         POWER_SUPPLY_PROP_ENERGY_NOW,
 311         POWER_SUPPLY_PROP_TEMP,
 312         POWER_SUPPLY_PROP_MODEL_NAME,
 313         POWER_SUPPLY_PROP_MANUFACTURER,
 314 };
 315
 316 #endif
 317
 318 /* --------------------------------------------------------------------------
 319                             Smart Battery System Management
 320    -------------------------------------------------------------------------- */
 321
 322 struct acpi_battery_reader {
 323         u8 command;             /* command for battery */
 324         u8 mode;                /* word or block? */
 325         size_t offset;          /* offset inside struct acpi_sbs_battery */
 326 };
 327
 328 static struct acpi_battery_reader info_readers[] = {
 329         {0x01, SMBUS_READ_WORD, offsetof(struct acpi_battery, alarm_capacity)},
 330         {0x03, SMBUS_READ_WORD, offsetof(struct acpi_battery, mode)},
 331         {0x10, SMBUS_READ_WORD, offsetof(struct acpi_battery, full_charge_capacity)},
 332         {0x17, SMBUS_READ_WORD, offsetof(struct acpi_battery, cycle_count)},
 333         {0x18, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_capacity)},
 334         {0x19, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_voltage)},
 335         {0x1a, SMBUS_READ_WORD, offsetof(struct acpi_battery, spec)},
 336         {0x1c, SMBUS_READ_WORD, offsetof(struct acpi_battery, serial_number)},
 337         {0x20, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, manufacturer_name)},
 338         {0x21, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_name)},
 339         {0x22, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_chemistry)},
 340 };
 341
 342 static struct acpi_battery_reader state_readers[] = {
 343         {0x08, SMBUS_READ_WORD, offsetof(struct acpi_battery, temp_now)},
 344         {0x09, SMBUS_READ_WORD, offsetof(struct acpi_battery, voltage_now)},
 345         {0x0a, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_now)},
 346         {0x0b, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_avg)},
 347         {0x0f, SMBUS_READ_WORD, offsetof(struct acpi_battery, capacity_now)},
 348         {0x0e, SMBUS_READ_WORD, offsetof(struct acpi_battery, state_of_charge)},
 349         {0x16, SMBUS_READ_WORD, offsetof(struct acpi_battery, state)},
 350 };
 351
 352 static int acpi_manager_get_info(struct acpi_sbs *sbs)
 353 {
 354         int result = 0;
 355         u16 battery_system_info;
 356
 357         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
 358                                  0x04, (u8 *)&battery_system_info);
 359         if (!result)
 360                 sbs->batteries_supported = battery_system_info & 0x000f;
 361         return result;
 362 }
 363
 364 static int acpi_battery_get_info(struct acpi_battery *battery)
 365 {
 366         int i, result = 0;
 367
 368         for (i = 0; i < ARRAY_SIZE(info_readers); ++i) {
 369                 result = acpi_smbus_read(battery->sbs->hc,
 370                                          info_readers[i].mode,
 371                                          ACPI_SBS_BATTERY,
 372                                          info_readers[i].command,
 373                                          (u8 *) battery +
 374                                                 info_readers[i].offset);
 375                 if (result)
 376                         break;
 377         }
 378         return result;
 379 }
 380
 381 static int acpi_battery_get_state(struct acpi_battery *battery)
 382 {
 383         int i, result = 0;
 384
 385         if (battery->update_time &&
 386             time_before(jiffies, battery->update_time +
 387                                 msecs_to_jiffies(cache_time)))
 388                 return 0;
 389         for (i = 0; i < ARRAY_SIZE(state_readers); ++i) {
 390                 result = acpi_smbus_read(battery->sbs->hc,
 391                                          state_readers[i].mode,
 392                                          ACPI_SBS_BATTERY,
 393                                          state_readers[i].command,
 394                                          (u8 *)battery +
 395                                                 state_readers[i].offset);
 396                 if (result)
 397                         goto end;
 398         }
 399       end:
 400         battery->update_time = jiffies;
 401         return result;
 402 }
 403
 404 static int acpi_battery_get_alarm(struct acpi_battery *battery)
 405 {
 406         return acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
 407                                  ACPI_SBS_BATTERY, 0x01,
 408                                  (u8 *)&battery->alarm_capacity);
 409 }
 410
 411 static int acpi_battery_set_alarm(struct acpi_battery *battery)
 412 {
 413         struct acpi_sbs *sbs = battery->sbs;
 414         u16 value, sel = 1 << (battery->id + 12);
 415
 416         int ret;
 417
 418
 419         if (sbs->manager_present) {
 420                 ret = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
 421                                 0x01, (u8 *)&value);
 422                 if (ret)
 423                         goto end;
 424                 if ((value & 0xf000) != sel) {
 425                         value &= 0x0fff;
 426                         value |= sel;
 427                 ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD,
 428                                          ACPI_SBS_MANAGER,
 429                                          0x01, (u8 *)&value, 2);
 430                 if (ret)
 431                         goto end;
 432                 }
 433         }
 434         ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD, ACPI_SBS_BATTERY,
 435                                 0x01, (u8 *)&battery->alarm_capacity, 2);
 436       end:
 437         return ret;
 438 }
 439
 440 static int acpi_ac_get_present(struct acpi_sbs *sbs)
 441 {
 442         int result;
 443         u16 status;
 444
 445         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_CHARGER,
 446                                  0x13, (u8 *) & status);
 447         if (!result)
 448                 sbs->charger_present = (status >> 15) & 0x1;
 449         return result;
 450 }
 451
 452 #ifdef CONFIG_ACPI_SYSFS_POWER
 453 static ssize_t acpi_battery_alarm_show(struct device *dev,
 454                                         struct device_attribute *attr,
 455                                         char *buf)
 456 {
 457         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 458         acpi_battery_get_alarm(battery);
 459         return sprintf(buf, "%d\n", battery->alarm_capacity *
 460                                 acpi_battery_scale(battery) * 1000);
 461 }
 462
 463 static ssize_t acpi_battery_alarm_store(struct device *dev,
 464                                         struct device_attribute *attr,
 465                                         const char *buf, size_t count)
 466 {
 467         unsigned long x;
 468         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 469         if (sscanf(buf, "%ld\n", &x) == 1)
 470                 battery->alarm_capacity = x /
 471                         (1000 * acpi_battery_scale(battery));
 472         if (battery->present)
 473                 acpi_battery_set_alarm(battery);
 474         return count;
 475 }
 476
 477 static struct device_attribute alarm_attr = {
 478         .attr = {.name = "alarm", .mode = 0644},
 479         .show = acpi_battery_alarm_show,
 480         .store = acpi_battery_alarm_store,
 481 };
 482 #endif
 483
 484 /* --------------------------------------------------------------------------
 485                               FS Interface (/proc/acpi)
 486    -------------------------------------------------------------------------- */
 487
 488 #ifdef CONFIG_ACPI_PROCFS_POWER
 489 /* Generic Routines */
 490 static int
 491 acpi_sbs_add_fs(struct proc_dir_entry **dir,
 492                 struct proc_dir_entry *parent_dir,
 493                 char *dir_name,
 494                 const struct file_operations *info_fops,
 495                 const struct file_operations *state_fops,
 496                 const struct file_operations *alarm_fops, void *data)
 497 {
 498         if (!*dir) {
 499                 *dir = proc_mkdir(dir_name, parent_dir);
 500                 if (!*dir) {
 501                         return -ENODEV;
 502                 }
 503         }
 504
 505         /* 'info' [R] */
 506         if (info_fops)
 507                 proc_create_data(ACPI_SBS_FILE_INFO, S_IRUGO, *dir,
 508                                  info_fops, data);
 509
 510         /* 'state' [R] */
 511         if (state_fops)
 512                 proc_create_data(ACPI_SBS_FILE_STATE, S_IRUGO, *dir,
 513                                  state_fops, data);
 514
 515         /* 'alarm' [R/W] */
 516         if (alarm_fops)
 517                 proc_create_data(ACPI_SBS_FILE_ALARM, S_IRUGO, *dir,
 518                                  alarm_fops, data);
 519         return 0;
 520 }
 521
 522 static void
 523 acpi_sbs_remove_fs(struct proc_dir_entry **dir,
 524                            struct proc_dir_entry *parent_dir)
 525 {
 526         if (*dir) {
 527                 remove_proc_entry(ACPI_SBS_FILE_INFO, *dir);
 528                 remove_proc_entry(ACPI_SBS_FILE_STATE, *dir);
 529                 remove_proc_entry(ACPI_SBS_FILE_ALARM, *dir);
 530                 remove_proc_entry((*dir)->name, parent_dir);
 531                 *dir = NULL;
 532         }
 533 }
 534
 535 /* Smart Battery Interface */
 536 static struct proc_dir_entry *acpi_battery_dir = NULL;
 537
 538 static inline char *acpi_battery_units(struct acpi_battery *battery)
 539 {
 540         return acpi_battery_mode(battery) ? " mW" : " mA";
 541 }
 542
 543
 544 static int acpi_battery_read_info(struct seq_file *seq, void *offset)
 545 {
 546         struct acpi_battery *battery = seq->private;
 547         struct acpi_sbs *sbs = battery->sbs;
 548         int result = 0;
 549
 550         mutex_lock(&sbs->lock);
 551
 552         seq_printf(seq, "present:                 %s\n",
 553                    (battery->present) ? "yes" : "no");
 554         if (!battery->present)
 555                 goto end;
 556
 557         seq_printf(seq, "design capacity:         %i%sh\n",
 558                    battery->design_capacity * acpi_battery_scale(battery),
 559                    acpi_battery_units(battery));
 560         seq_printf(seq, "last full capacity:      %i%sh\n",
 561                    battery->full_charge_capacity * acpi_battery_scale(battery),
 562                    acpi_battery_units(battery));
 563         seq_printf(seq, "battery technology:      rechargeable\n");
 564         seq_printf(seq, "design voltage:          %i mV\n",
 565                    battery->design_voltage * acpi_battery_vscale(battery));
 566         seq_printf(seq, "design capacity warning: unknown\n");
 567         seq_printf(seq, "design capacity low:     unknown\n");
 568         seq_printf(seq, "cycle count:             %i\n", battery->cycle_count);
 569         seq_printf(seq, "capacity granularity 1:  unknown\n");
 570         seq_printf(seq, "capacity granularity 2:  unknown\n");
 571         seq_printf(seq, "model number:            %s\n", battery->device_name);
 572         seq_printf(seq, "serial number:           %i\n",
 573                    battery->serial_number);
 574         seq_printf(seq, "battery type:            %s\n",
 575                    battery->device_chemistry);
 576         seq_printf(seq, "OEM info:                %s\n",
 577                    battery->manufacturer_name);
 578       end:
 579         mutex_unlock(&sbs->lock);
 580         return result;
 581 }
 582
 583 static int acpi_battery_info_open_fs(struct inode *inode, struct file *file)
 584 {
 585         return single_open(file, acpi_battery_read_info, PDE(inode)->data);
 586 }
 587
 588 static int acpi_battery_read_state(struct seq_file *seq, void *offset)
 589 {
 590         struct acpi_battery *battery = seq->private;
 591         struct acpi_sbs *sbs = battery->sbs;
 592         int rate;
 593
 594         mutex_lock(&sbs->lock);
 595         seq_printf(seq, "present:                 %s\n",
 596                    (battery->present) ? "yes" : "no");
 597         if (!battery->present)
 598                 goto end;
 599
 600         acpi_battery_get_state(battery);
 601         seq_printf(seq, "capacity state:          %s\n",
 602                    (battery->state & 0x0010) ? "critical" : "ok");
 603         seq_printf(seq, "charging state:          %s\n",
 604                    (battery->rate_now < 0) ? "discharging" :
 605                    ((battery->rate_now > 0) ? "charging" : "charged"));
 606         rate = abs(battery->rate_now) * acpi_battery_ipscale(battery);
 607         rate *= (acpi_battery_mode(battery))?(battery->voltage_now *
 608                         acpi_battery_vscale(battery)/1000):1;
 609         seq_printf(seq, "present rate:            %d%s\n", rate,
 610                    acpi_battery_units(battery));
 611         seq_printf(seq, "remaining capacity:      %i%sh\n",
 612                    battery->capacity_now * acpi_battery_scale(battery),
 613                    acpi_battery_units(battery));
 614         seq_printf(seq, "present voltage:         %i mV\n",
 615                    battery->voltage_now * acpi_battery_vscale(battery));
 616
 617       end:
 618         mutex_unlock(&sbs->lock);
 619         return 0;
 620 }
 621
 622 static int acpi_battery_state_open_fs(struct inode *inode, struct file *file)
 623 {
 624         return single_open(file, acpi_battery_read_state, PDE(inode)->data);
 625 }
 626
 627 static int acpi_battery_read_alarm(struct seq_file *seq, void *offset)
 628 {
 629         struct acpi_battery *battery = seq->private;
 630         struct acpi_sbs *sbs = battery->sbs;
 631         int result = 0;
 632
 633         mutex_lock(&sbs->lock);
 634
 635         if (!battery->present) {
 636                 seq_printf(seq, "present:                 no\n");
 637                 goto end;
 638         }
 639
 640         acpi_battery_get_alarm(battery);
 641         seq_printf(seq, "alarm:                   ");
 642         if (battery->alarm_capacity)
 643                 seq_printf(seq, "%i%sh\n",
 644                            battery->alarm_capacity *
 645                            acpi_battery_scale(battery),
 646                            acpi_battery_units(battery));
 647         else
 648                 seq_printf(seq, "disabled\n");
 649       end:
 650         mutex_unlock(&sbs->lock);
 651         return result;
 652 }
 653
 654 static ssize_t
 655 acpi_battery_write_alarm(struct file *file, const char __user * buffer,
 656                          size_t count, loff_t * ppos)
 657 {
 658         struct seq_file *seq = file->private_data;
 659         struct acpi_battery *battery = seq->private;
 660         struct acpi_sbs *sbs = battery->sbs;
 661         char alarm_string[12] = { '\0' };
 662         int result = 0;
 663         mutex_lock(&sbs->lock);
 664         if (!battery->present) {
 665                 result = -ENODEV;
 666                 goto end;
 667         }
 668         if (count > sizeof(alarm_string) - 1) {
 669                 result = -EINVAL;
 670                 goto end;
 671         }
 672         if (copy_from_user(alarm_string, buffer, count)) {
 673                 result = -EFAULT;
 674                 goto end;
 675         }
 676         alarm_string[count] = 0;
 677         battery->alarm_capacity = simple_strtoul(alarm_string, NULL, 0) /
 678                                         acpi_battery_scale(battery);
 679         acpi_battery_set_alarm(battery);
 680       end:
 681         mutex_unlock(&sbs->lock);
 682         if (result)
 683                 return result;
 684         return count;
 685 }
 686
 687 static int acpi_battery_alarm_open_fs(struct inode *inode, struct file *file)
 688 {
 689         return single_open(file, acpi_battery_read_alarm, PDE(inode)->data);
 690 }
 691
 692 static const struct file_operations acpi_battery_info_fops = {
 693         .open = acpi_battery_info_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_state_fops = {
 701         .open = acpi_battery_state_open_fs,
 702         .read = seq_read,
 703         .llseek = seq_lseek,
 704         .release = single_release,
 705         .owner = THIS_MODULE,
 706 };
 707
 708 static const struct file_operations acpi_battery_alarm_fops = {
 709         .open = acpi_battery_alarm_open_fs,
 710         .read = seq_read,
 711         .write = acpi_battery_write_alarm,
 712         .llseek = seq_lseek,
 713         .release = single_release,
 714         .owner = THIS_MODULE,
 715 };
 716
 717 /* Legacy AC Adapter Interface */
 718
 719 static struct proc_dir_entry *acpi_ac_dir = NULL;
 720
 721 static int acpi_ac_read_state(struct seq_file *seq, void *offset)
 722 {
 723
 724         struct acpi_sbs *sbs = seq->private;
 725
 726         mutex_lock(&sbs->lock);
 727
 728         seq_printf(seq, "state:                   %s\n",
 729                    sbs->charger_present ? "on-line" : "off-line");
 730
 731         mutex_unlock(&sbs->lock);
 732         return 0;
 733 }
 734
 735 static int acpi_ac_state_open_fs(struct inode *inode, struct file *file)
 736 {
 737         return single_open(file, acpi_ac_read_state, PDE(inode)->data);
 738 }
 739
 740 static const struct file_operations acpi_ac_state_fops = {
 741         .open = acpi_ac_state_open_fs,
 742         .read = seq_read,
 743         .llseek = seq_lseek,
 744         .release = single_release,
 745         .owner = THIS_MODULE,
 746 };
 747
 748 #endif
 749
 750 /* --------------------------------------------------------------------------
 751                                  Driver Interface
 752    -------------------------------------------------------------------------- */
 753 static int acpi_battery_read(struct acpi_battery *battery)
 754 {
 755         int result = 0, saved_present = battery->present;
 756         u16 state;
 757
 758         if (battery->sbs->manager_present) {
 759                 result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
 760                                 ACPI_SBS_MANAGER, 0x01, (u8 *)&state);
 761                 if (!result)
 762                         battery->present = state & (1 << battery->id);
 763                 state &= 0x0fff;
 764                 state |= 1 << (battery->id + 12);
 765                 acpi_smbus_write(battery->sbs->hc, SMBUS_WRITE_WORD,
 766                                   ACPI_SBS_MANAGER, 0x01, (u8 *)&state, 2);
 767         } else if (battery->id == 0)
 768                 battery->present = 1;
 769         if (result || !battery->present)
 770                 return result;
 771
 772         if (saved_present != battery->present) {
 773                 battery->update_time = 0;
 774                 result = acpi_battery_get_info(battery);
 775                 if (result)
 776                         return result;
 777         }
 778         result = acpi_battery_get_state(battery);
 779         return result;
 780 }
 781
 782 /* Smart Battery */
 783 static int acpi_battery_add(struct acpi_sbs *sbs, int id)
 784 {
 785         struct acpi_battery *battery = &sbs->battery[id];
 786         int result;
 787
 788         battery->id = id;
 789         battery->sbs = sbs;
 790         result = acpi_battery_read(battery);
 791         if (result)
 792                 return result;
 793
 794         sprintf(battery->name, ACPI_BATTERY_DIR_NAME, id);
 795 #ifdef CONFIG_ACPI_PROCFS_POWER
 796         acpi_sbs_add_fs(&battery->proc_entry, acpi_battery_dir,
 797                         battery->name, &acpi_battery_info_fops,
 798                         &acpi_battery_state_fops, &acpi_battery_alarm_fops,
 799                         battery);
 800 #endif
 801 #ifdef CONFIG_ACPI_SYSFS_POWER
 802         battery->bat.name = battery->name;
 803         battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
 804         if (!acpi_battery_mode(battery)) {
 805                 battery->bat.properties = sbs_charge_battery_props;
 806                 battery->bat.num_properties =
 807                     ARRAY_SIZE(sbs_charge_battery_props);
 808         } else {
 809                 battery->bat.properties = sbs_energy_battery_props;
 810                 battery->bat.num_properties =
 811                     ARRAY_SIZE(sbs_energy_battery_props);
 812         }
 813         battery->bat.get_property = acpi_sbs_battery_get_property;
 814         result = power_supply_register(&sbs->device->dev, &battery->bat);
 815         if (result)
 816                 goto end;
 817         result = device_create_file(battery->bat.dev, &alarm_attr);
 818         if (result)
 819                 goto end;
 820         battery->have_sysfs_alarm = 1;
 821       end:
 822 #endif
 823         printk(KERN_INFO PREFIX "%s [%s]: Battery Slot [%s] (battery %s)\n",
 824                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
 825                battery->name, battery->present ? "present" : "absent");
 826         return result;
 827 }
 828
 829 static void acpi_battery_remove(struct acpi_sbs *sbs, int id)
 830 {
 831 #if defined(CONFIG_ACPI_SYSFS_POWER) || defined(CONFIG_ACPI_PROCFS_POWER)
 832         struct acpi_battery *battery = &sbs->battery[id];
 833 #endif
 834
 835 #ifdef CONFIG_ACPI_SYSFS_POWER
 836         if (battery->bat.dev) {
 837                 if (battery->have_sysfs_alarm)
 838                         device_remove_file(battery->bat.dev, &alarm_attr);
 839                 power_supply_unregister(&battery->bat);
 840         }
 841 #endif
 842 #ifdef CONFIG_ACPI_PROCFS_POWER
 843         if (battery->proc_entry)
 844                 acpi_sbs_remove_fs(&battery->proc_entry, acpi_battery_dir);
 845 #endif
 846 }
 847
 848 static int acpi_charger_add(struct acpi_sbs *sbs)
 849 {
 850         int result;
 851
 852         result = acpi_ac_get_present(sbs);
 853         if (result)
 854                 goto end;
 855 #ifdef CONFIG_ACPI_PROCFS_POWER
 856         result = acpi_sbs_add_fs(&sbs->charger_entry, acpi_ac_dir,
 857                                  ACPI_AC_DIR_NAME, NULL,
 858                                  &acpi_ac_state_fops, NULL, sbs);
 859         if (result)
 860                 goto end;
 861 #endif
 862 #ifdef CONFIG_ACPI_SYSFS_POWER
 863         sbs->charger.name = "sbs-charger";
 864         sbs->charger.type = POWER_SUPPLY_TYPE_MAINS;
 865         sbs->charger.properties = sbs_ac_props;
 866         sbs->charger.num_properties = ARRAY_SIZE(sbs_ac_props);
 867         sbs->charger.get_property = sbs_get_ac_property;
 868         power_supply_register(&sbs->device->dev, &sbs->charger);
 869 #endif
 870         printk(KERN_INFO PREFIX "%s [%s]: AC Adapter [%s] (%s)\n",
 871                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
 872                ACPI_AC_DIR_NAME, sbs->charger_present ? "on-line" : "off-line");
 873       end:
 874         return result;
 875 }
 876
 877 static void acpi_charger_remove(struct acpi_sbs *sbs)
 878 {
 879 #ifdef CONFIG_ACPI_SYSFS_POWER
 880         if (sbs->charger.dev)
 881                 power_supply_unregister(&sbs->charger);
 882 #endif
 883 #ifdef CONFIG_ACPI_PROCFS_POWER
 884         if (sbs->charger_entry)
 885                 acpi_sbs_remove_fs(&sbs->charger_entry, acpi_ac_dir);
 886 #endif
 887 }
 888
 889 static void acpi_sbs_callback(void *context)
 890 {
 891         int id;
 892         struct acpi_sbs *sbs = context;
 893         struct acpi_battery *bat;
 894         u8 saved_charger_state = sbs->charger_present;
 895         u8 saved_battery_state;
 896         acpi_ac_get_present(sbs);
 897         if (sbs->charger_present != saved_charger_state) {
 898 #ifdef CONFIG_ACPI_PROC_EVENT
 899                 acpi_bus_generate_proc_event4(ACPI_AC_CLASS, ACPI_AC_DIR_NAME,
 900                                               ACPI_SBS_NOTIFY_STATUS,
 901                                               sbs->charger_present);
 902 #endif
 903 #ifdef CONFIG_ACPI_SYSFS_POWER
 904                 kobject_uevent(&sbs->charger.dev->kobj, KOBJ_CHANGE);
 905 #endif
 906         }
 907         if (sbs->manager_present) {
 908                 for (id = 0; id < MAX_SBS_BAT; ++id) {
 909                         if (!(sbs->batteries_supported & (1 << id)))
 910                                 continue;
 911                         bat = &sbs->battery[id];
 912                         saved_battery_state = bat->present;
 913                         acpi_battery_read(bat);
 914                         if (saved_battery_state == bat->present)
 915                                 continue;
 916 #ifdef CONFIG_ACPI_PROC_EVENT
 917                         acpi_bus_generate_proc_event4(ACPI_BATTERY_CLASS,
 918                                                       bat->name,
 919                                                       ACPI_SBS_NOTIFY_STATUS,
 920                                                       bat->present);
 921 #endif
 922 #ifdef CONFIG_ACPI_SYSFS_POWER
 923                         kobject_uevent(&bat->bat.dev->kobj, KOBJ_CHANGE);
 924 #endif
 925                 }
 926         }
 927 }
 928
 929 static int acpi_sbs_remove(struct acpi_device *device, int type);
 930
 931 static int acpi_sbs_add(struct acpi_device *device)
 932 {
 933         struct acpi_sbs *sbs;
 934         int result = 0;
 935         int id;
 936
 937         sbs = kzalloc(sizeof(struct acpi_sbs), GFP_KERNEL);
 938         if (!sbs) {
 939                 result = -ENOMEM;
 940                 goto end;
 941         }
 942
 943         mutex_init(&sbs->lock);
 944
 945         sbs->hc = acpi_driver_data(device->parent);
 946         sbs->device = device;
 947         strcpy(acpi_device_name(device), ACPI_SBS_DEVICE_NAME);
 948         strcpy(acpi_device_class(device), ACPI_SBS_CLASS);
 949         device->driver_data = sbs;
 950
 951         result = acpi_charger_add(sbs);
 952         if (result)
 953                 goto end;
 954
 955         result = acpi_manager_get_info(sbs);
 956         if (!result) {
 957                 sbs->manager_present = 1;
 958                 for (id = 0; id < MAX_SBS_BAT; ++id)
 959                         if ((sbs->batteries_supported & (1 << id)))
 960                                 acpi_battery_add(sbs, id);
 961         } else
 962                 acpi_battery_add(sbs, 0);
 963         acpi_smbus_register_callback(sbs->hc, acpi_sbs_callback, sbs);
 964       end:
 965         if (result)
 966                 acpi_sbs_remove(device, 0);
 967         return result;
 968 }
 969
 970 static int acpi_sbs_remove(struct acpi_device *device, int type)
 971 {
 972         struct acpi_sbs *sbs;
 973         int id;
 974
 975         if (!device)
 976                 return -EINVAL;
 977         sbs = acpi_driver_data(device);
 978         if (!sbs)
 979                 return -EINVAL;
 980         mutex_lock(&sbs->lock);
 981         acpi_smbus_unregister_callback(sbs->hc);
 982         for (id = 0; id < MAX_SBS_BAT; ++id)
 983                 acpi_battery_remove(sbs, id);
 984         acpi_charger_remove(sbs);
 985         mutex_unlock(&sbs->lock);
 986         mutex_destroy(&sbs->lock);
 987         kfree(sbs);
 988         return 0;
 989 }
 990
 991 static void acpi_sbs_rmdirs(void)
 992 {
 993 #ifdef CONFIG_ACPI_PROCFS_POWER
 994         if (acpi_ac_dir) {
 995                 acpi_unlock_ac_dir(acpi_ac_dir);
 996                 acpi_ac_dir = NULL;
 997         }
 998         if (acpi_battery_dir) {
 999                 acpi_unlock_battery_dir(acpi_battery_dir);
1000                 acpi_battery_dir = NULL;
1001         }
1002 #endif
1003 }
1004
1005 static int acpi_sbs_resume(struct acpi_device *device)
1006 {
1007         struct acpi_sbs *sbs;
1008         if (!device)
1009                 return -EINVAL;
1010         sbs = device->driver_data;
1011         acpi_sbs_callback(sbs);
1012         return 0;
1013 }
1014
1015 static struct acpi_driver acpi_sbs_driver = {
1016         .name = "sbs",
1017         .class = ACPI_SBS_CLASS,
1018         .ids = sbs_device_ids,
1019         .ops = {
1020                 .add = acpi_sbs_add,
1021                 .remove = acpi_sbs_remove,
1022                 .resume = acpi_sbs_resume,
1023                 },
1024 };
1025
1026 static int __init acpi_sbs_init(void)
1027 {
1028         int result = 0;
1029
1030         if (acpi_disabled)
1031                 return -ENODEV;
1032 #ifdef CONFIG_ACPI_PROCFS_POWER
1033         acpi_ac_dir = acpi_lock_ac_dir();
1034         if (!acpi_ac_dir)
1035                 return -ENODEV;
1036         acpi_battery_dir = acpi_lock_battery_dir();
1037         if (!acpi_battery_dir) {
1038                 acpi_sbs_rmdirs();
1039                 return -ENODEV;
1040         }
1041 #endif
1042         result = acpi_bus_register_driver(&acpi_sbs_driver);
1043         if (result < 0) {
1044                 acpi_sbs_rmdirs();
1045                 return -ENODEV;
1046         }
1047         return 0;
1048 }
1049
1050 static void __exit acpi_sbs_exit(void)
1051 {
1052         acpi_bus_unregister_driver(&acpi_sbs_driver);
1053         acpi_sbs_rmdirs();
1054         return;
1055 }
1056
1057 module_init(acpi_sbs_init);
1058 module_exit(acpi_sbs_exit);