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 #include <linux/power_supply.h>
  44
  45 #include "sbshc.h"
  46
  47 #define PREFIX "ACPI: "
  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         struct power_supply bat;
  86         struct acpi_sbs *sbs;
  87 #ifdef CONFIG_ACPI_PROCFS_POWER
  88         struct proc_dir_entry *proc_entry;
  89 #endif
  90         unsigned long update_time;
  91         char name[8];
  92         char manufacturer_name[ACPI_SBS_BLOCK_MAX];
  93         char device_name[ACPI_SBS_BLOCK_MAX];
  94         char device_chemistry[ACPI_SBS_BLOCK_MAX];
  95         u16 alarm_capacity;
  96         u16 full_charge_capacity;
  97         u16 design_capacity;
  98         u16 design_voltage;
  99         u16 serial_number;
 100         u16 cycle_count;
 101         u16 temp_now;
 102         u16 voltage_now;
 103         s16 rate_now;
 104         s16 rate_avg;
 105         u16 capacity_now;
 106         u16 state_of_charge;
 107         u16 state;
 108         u16 mode;
 109         u16 spec;
 110         u8 id;
 111         u8 present:1;
 112         u8 have_sysfs_alarm:1;
 113 };
 114
 115 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat)
 116
 117 struct acpi_sbs {
 118         struct power_supply charger;
 119         struct acpi_device *device;
 120         struct acpi_smb_hc *hc;
 121         struct mutex lock;
 122 #ifdef CONFIG_ACPI_PROCFS_POWER
 123         struct proc_dir_entry *charger_entry;
 124 #endif
 125         struct acpi_battery battery[MAX_SBS_BAT];
 126         u8 batteries_supported:4;
 127         u8 manager_present:1;
 128         u8 charger_present:1;
 129 };
 130
 131 #define to_acpi_sbs(x) container_of(x, struct acpi_sbs, charger)
 132
 133 static int acpi_sbs_remove(struct acpi_device *device);
 134 static int acpi_battery_get_state(struct acpi_battery *battery);
 135
 136 static inline int battery_scale(int log)
 137 {
 138         int scale = 1;
 139         while (log--)
 140                 scale *= 10;
 141         return scale;
 142 }
 143
 144 static inline int acpi_battery_vscale(struct acpi_battery *battery)
 145 {
 146         return battery_scale((battery->spec & 0x0f00) >> 8);
 147 }
 148
 149 static inline int acpi_battery_ipscale(struct acpi_battery *battery)
 150 {
 151         return battery_scale((battery->spec & 0xf000) >> 12);
 152 }
 153
 154 static inline int acpi_battery_mode(struct acpi_battery *battery)
 155 {
 156         return (battery->mode & 0x8000);
 157 }
 158
 159 static inline int acpi_battery_scale(struct acpi_battery *battery)
 160 {
 161         return (acpi_battery_mode(battery) ? 10 : 1) *
 162             acpi_battery_ipscale(battery);
 163 }
 164
 165 static int sbs_get_ac_property(struct power_supply *psy,
 166                                enum power_supply_property psp,
 167                                union power_supply_propval *val)
 168 {
 169         struct acpi_sbs *sbs = to_acpi_sbs(psy);
 170         switch (psp) {
 171         case POWER_SUPPLY_PROP_ONLINE:
 172                 val->intval = sbs->charger_present;
 173                 break;
 174         default:
 175                 return -EINVAL;
 176         }
 177         return 0;
 178 }
 179
 180 static int acpi_battery_technology(struct acpi_battery *battery)
 181 {
 182         if (!strcasecmp("NiCd", battery->device_chemistry))
 183                 return POWER_SUPPLY_TECHNOLOGY_NiCd;
 184         if (!strcasecmp("NiMH", battery->device_chemistry))
 185                 return POWER_SUPPLY_TECHNOLOGY_NiMH;
 186         if (!strcasecmp("LION", battery->device_chemistry))
 187                 return POWER_SUPPLY_TECHNOLOGY_LION;
 188         if (!strcasecmp("LiP", battery->device_chemistry))
 189                 return POWER_SUPPLY_TECHNOLOGY_LIPO;
 190         return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 191 }
 192
 193 static int acpi_sbs_battery_get_property(struct power_supply *psy,
 194                                          enum power_supply_property psp,
 195                                          union power_supply_propval *val)
 196 {
 197         struct acpi_battery *battery = to_acpi_battery(psy);
 198
 199         if ((!battery->present) && psp != POWER_SUPPLY_PROP_PRESENT)
 200                 return -ENODEV;
 201
 202         acpi_battery_get_state(battery);
 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_CYCLE_COUNT:
 219                 val->intval = battery->cycle_count;
 220                 break;
 221         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 222                 val->intval = battery->design_voltage *
 223                         acpi_battery_vscale(battery) * 1000;
 224                 break;
 225         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 226                 val->intval = battery->voltage_now *
 227                                 acpi_battery_vscale(battery) * 1000;
 228                 break;
 229         case POWER_SUPPLY_PROP_CURRENT_NOW:
 230         case POWER_SUPPLY_PROP_POWER_NOW:
 231                 val->intval = abs(battery->rate_now) *
 232                                 acpi_battery_ipscale(battery) * 1000;
 233                 val->intval *= (acpi_battery_mode(battery)) ?
 234                                 (battery->voltage_now *
 235                                 acpi_battery_vscale(battery) / 1000) : 1;
 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                 val->intval *= (acpi_battery_mode(battery)) ?
 242                                 (battery->voltage_now *
 243                                 acpi_battery_vscale(battery) / 1000) : 1;
 244                 break;
 245         case POWER_SUPPLY_PROP_CAPACITY:
 246                 val->intval = battery->state_of_charge;
 247                 break;
 248         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 249         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 250                 val->intval = battery->design_capacity *
 251                         acpi_battery_scale(battery) * 1000;
 252                 break;
 253         case POWER_SUPPLY_PROP_CHARGE_FULL:
 254         case POWER_SUPPLY_PROP_ENERGY_FULL:
 255                 val->intval = battery->full_charge_capacity *
 256                         acpi_battery_scale(battery) * 1000;
 257                 break;
 258         case POWER_SUPPLY_PROP_CHARGE_NOW:
 259         case POWER_SUPPLY_PROP_ENERGY_NOW:
 260                 val->intval = battery->capacity_now *
 261                                 acpi_battery_scale(battery) * 1000;
 262                 break;
 263         case POWER_SUPPLY_PROP_TEMP:
 264                 val->intval = battery->temp_now - 2730; // dK -> dC
 265                 break;
 266         case POWER_SUPPLY_PROP_MODEL_NAME:
 267                 val->strval = battery->device_name;
 268                 break;
 269         case POWER_SUPPLY_PROP_MANUFACTURER:
 270                 val->strval = battery->manufacturer_name;
 271                 break;
 272         default:
 273                 return -EINVAL;
 274         }
 275         return 0;
 276 }
 277
 278 static enum power_supply_property sbs_ac_props[] = {
 279         POWER_SUPPLY_PROP_ONLINE,
 280 };
 281
 282 static enum power_supply_property sbs_charge_battery_props[] = {
 283         POWER_SUPPLY_PROP_STATUS,
 284         POWER_SUPPLY_PROP_PRESENT,
 285         POWER_SUPPLY_PROP_TECHNOLOGY,
 286         POWER_SUPPLY_PROP_CYCLE_COUNT,
 287         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 288         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 289         POWER_SUPPLY_PROP_CURRENT_NOW,
 290         POWER_SUPPLY_PROP_CURRENT_AVG,
 291         POWER_SUPPLY_PROP_CAPACITY,
 292         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 293         POWER_SUPPLY_PROP_CHARGE_FULL,
 294         POWER_SUPPLY_PROP_CHARGE_NOW,
 295         POWER_SUPPLY_PROP_TEMP,
 296         POWER_SUPPLY_PROP_MODEL_NAME,
 297         POWER_SUPPLY_PROP_MANUFACTURER,
 298 };
 299
 300 static enum power_supply_property sbs_energy_battery_props[] = {
 301         POWER_SUPPLY_PROP_STATUS,
 302         POWER_SUPPLY_PROP_PRESENT,
 303         POWER_SUPPLY_PROP_TECHNOLOGY,
 304         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 305         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 306         POWER_SUPPLY_PROP_CURRENT_NOW,
 307         POWER_SUPPLY_PROP_CURRENT_AVG,
 308         POWER_SUPPLY_PROP_POWER_NOW,
 309         POWER_SUPPLY_PROP_POWER_AVG,
 310         POWER_SUPPLY_PROP_CAPACITY,
 311         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 312         POWER_SUPPLY_PROP_ENERGY_FULL,
 313         POWER_SUPPLY_PROP_ENERGY_NOW,
 314         POWER_SUPPLY_PROP_TEMP,
 315         POWER_SUPPLY_PROP_MODEL_NAME,
 316         POWER_SUPPLY_PROP_MANUFACTURER,
 317 };
 318
 319
 320 /* --------------------------------------------------------------------------
 321                             Smart Battery System Management
 322    -------------------------------------------------------------------------- */
 323
 324 struct acpi_battery_reader {
 325         u8 command;             /* command for battery */
 326         u8 mode;                /* word or block? */
 327         size_t offset;          /* offset inside struct acpi_sbs_battery */
 328 };
 329
 330 static struct acpi_battery_reader info_readers[] = {
 331         {0x01, SMBUS_READ_WORD, offsetof(struct acpi_battery, alarm_capacity)},
 332         {0x03, SMBUS_READ_WORD, offsetof(struct acpi_battery, mode)},
 333         {0x10, SMBUS_READ_WORD, offsetof(struct acpi_battery, full_charge_capacity)},
 334         {0x17, SMBUS_READ_WORD, offsetof(struct acpi_battery, cycle_count)},
 335         {0x18, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_capacity)},
 336         {0x19, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_voltage)},
 337         {0x1a, SMBUS_READ_WORD, offsetof(struct acpi_battery, spec)},
 338         {0x1c, SMBUS_READ_WORD, offsetof(struct acpi_battery, serial_number)},
 339         {0x20, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, manufacturer_name)},
 340         {0x21, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_name)},
 341         {0x22, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_chemistry)},
 342 };
 343
 344 static struct acpi_battery_reader state_readers[] = {
 345         {0x08, SMBUS_READ_WORD, offsetof(struct acpi_battery, temp_now)},
 346         {0x09, SMBUS_READ_WORD, offsetof(struct acpi_battery, voltage_now)},
 347         {0x0a, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_now)},
 348         {0x0b, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_avg)},
 349         {0x0f, SMBUS_READ_WORD, offsetof(struct acpi_battery, capacity_now)},
 350         {0x0e, SMBUS_READ_WORD, offsetof(struct acpi_battery, state_of_charge)},
 351         {0x16, SMBUS_READ_WORD, offsetof(struct acpi_battery, state)},
 352 };
 353
 354 static int acpi_manager_get_info(struct acpi_sbs *sbs)
 355 {
 356         int result = 0;
 357         u16 battery_system_info;
 358
 359         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
 360                                  0x04, (u8 *)&battery_system_info);
 361         if (!result)
 362                 sbs->batteries_supported = battery_system_info & 0x000f;
 363         return result;
 364 }
 365
 366 static int acpi_battery_get_info(struct acpi_battery *battery)
 367 {
 368         int i, result = 0;
 369
 370         for (i = 0; i < ARRAY_SIZE(info_readers); ++i) {
 371                 result = acpi_smbus_read(battery->sbs->hc,
 372                                          info_readers[i].mode,
 373                                          ACPI_SBS_BATTERY,
 374                                          info_readers[i].command,
 375                                          (u8 *) battery +
 376                                                 info_readers[i].offset);
 377                 if (result)
 378                         break;
 379         }
 380         return result;
 381 }
 382
 383 static int acpi_battery_get_state(struct acpi_battery *battery)
 384 {
 385         int i, result = 0;
 386
 387         if (battery->update_time &&
 388             time_before(jiffies, battery->update_time +
 389                                 msecs_to_jiffies(cache_time)))
 390                 return 0;
 391         for (i = 0; i < ARRAY_SIZE(state_readers); ++i) {
 392                 result = acpi_smbus_read(battery->sbs->hc,
 393                                          state_readers[i].mode,
 394                                          ACPI_SBS_BATTERY,
 395                                          state_readers[i].command,
 396                                          (u8 *)battery +
 397                                                 state_readers[i].offset);
 398                 if (result)
 399                         goto end;
 400         }
 401       end:
 402         battery->update_time = jiffies;
 403         return result;
 404 }
 405
 406 static int acpi_battery_get_alarm(struct acpi_battery *battery)
 407 {
 408         return acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
 409                                  ACPI_SBS_BATTERY, 0x01,
 410                                  (u8 *)&battery->alarm_capacity);
 411 }
 412
 413 static int acpi_battery_set_alarm(struct acpi_battery *battery)
 414 {
 415         struct acpi_sbs *sbs = battery->sbs;
 416         u16 value, sel = 1 << (battery->id + 12);
 417
 418         int ret;
 419
 420
 421         if (sbs->manager_present) {
 422                 ret = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
 423                                 0x01, (u8 *)&value);
 424                 if (ret)
 425                         goto end;
 426                 if ((value & 0xf000) != sel) {
 427                         value &= 0x0fff;
 428                         value |= sel;
 429                 ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD,
 430                                          ACPI_SBS_MANAGER,
 431                                          0x01, (u8 *)&value, 2);
 432                 if (ret)
 433                         goto end;
 434                 }
 435         }
 436         ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD, ACPI_SBS_BATTERY,
 437                                 0x01, (u8 *)&battery->alarm_capacity, 2);
 438       end:
 439         return ret;
 440 }
 441
 442 static int acpi_ac_get_present(struct acpi_sbs *sbs)
 443 {
 444         int result;
 445         u16 status;
 446
 447         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_CHARGER,
 448                                  0x13, (u8 *) & status);
 449         if (!result)
 450                 sbs->charger_present = (status >> 15) & 0x1;
 451         return result;
 452 }
 453
 454 static ssize_t acpi_battery_alarm_show(struct device *dev,
 455                                         struct device_attribute *attr,
 456                                         char *buf)
 457 {
 458         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 459         acpi_battery_get_alarm(battery);
 460         return sprintf(buf, "%d\n", battery->alarm_capacity *
 461                                 acpi_battery_scale(battery) * 1000);
 462 }
 463
 464 static ssize_t acpi_battery_alarm_store(struct device *dev,
 465                                         struct device_attribute *attr,
 466                                         const char *buf, size_t count)
 467 {
 468         unsigned long x;
 469         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 470         if (sscanf(buf, "%ld\n", &x) == 1)
 471                 battery->alarm_capacity = x /
 472                         (1000 * acpi_battery_scale(battery));
 473         if (battery->present)
 474                 acpi_battery_set_alarm(battery);
 475         return count;
 476 }
 477
 478 static struct device_attribute alarm_attr = {
 479         .attr = {.name = "alarm", .mode = 0644},
 480         .show = acpi_battery_alarm_show,
 481         .store = acpi_battery_alarm_store,
 482 };
 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         printk(KERN_WARNING PREFIX "Deprecated procfs I/F for SBS is loaded,"
 499                         " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
 500         if (!*dir) {
 501                 *dir = proc_mkdir(dir_name, parent_dir);
 502                 if (!*dir) {
 503                         return -ENODEV;
 504                 }
 505         }
 506
 507         /* 'info' [R] */
 508         if (info_fops)
 509                 proc_create_data(ACPI_SBS_FILE_INFO, S_IRUGO, *dir,
 510                                  info_fops, data);
 511
 512         /* 'state' [R] */
 513         if (state_fops)
 514                 proc_create_data(ACPI_SBS_FILE_STATE, S_IRUGO, *dir,
 515                                  state_fops, data);
 516
 517         /* 'alarm' [R/W] */
 518         if (alarm_fops)
 519                 proc_create_data(ACPI_SBS_FILE_ALARM, S_IRUGO, *dir,
 520                                  alarm_fops, data);
 521         return 0;
 522 }
 523
 524 /* Smart Battery Interface */
 525 static struct proc_dir_entry *acpi_battery_dir = NULL;
 526
 527 static inline char *acpi_battery_units(struct acpi_battery *battery)
 528 {
 529         return acpi_battery_mode(battery) ? " mW" : " mA";
 530 }
 531
 532
 533 static int acpi_battery_read_info(struct seq_file *seq, void *offset)
 534 {
 535         struct acpi_battery *battery = seq->private;
 536         struct acpi_sbs *sbs = battery->sbs;
 537         int result = 0;
 538
 539         mutex_lock(&sbs->lock);
 540
 541         seq_printf(seq, "present:                 %s\n",
 542                    (battery->present) ? "yes" : "no");
 543         if (!battery->present)
 544                 goto end;
 545
 546         seq_printf(seq, "design capacity:         %i%sh\n",
 547                    battery->design_capacity * acpi_battery_scale(battery),
 548                    acpi_battery_units(battery));
 549         seq_printf(seq, "last full capacity:      %i%sh\n",
 550                    battery->full_charge_capacity * acpi_battery_scale(battery),
 551                    acpi_battery_units(battery));
 552         seq_printf(seq, "battery technology:      rechargeable\n");
 553         seq_printf(seq, "design voltage:          %i mV\n",
 554                    battery->design_voltage * acpi_battery_vscale(battery));
 555         seq_printf(seq, "design capacity warning: unknown\n");
 556         seq_printf(seq, "design capacity low:     unknown\n");
 557         seq_printf(seq, "cycle count:             %i\n", battery->cycle_count);
 558         seq_printf(seq, "capacity granularity 1:  unknown\n");
 559         seq_printf(seq, "capacity granularity 2:  unknown\n");
 560         seq_printf(seq, "model number:            %s\n", battery->device_name);
 561         seq_printf(seq, "serial number:           %i\n",
 562                    battery->serial_number);
 563         seq_printf(seq, "battery type:            %s\n",
 564                    battery->device_chemistry);
 565         seq_printf(seq, "OEM info:                %s\n",
 566                    battery->manufacturer_name);
 567       end:
 568         mutex_unlock(&sbs->lock);
 569         return result;
 570 }
 571
 572 static int acpi_battery_info_open_fs(struct inode *inode, struct file *file)
 573 {
 574         return single_open(file, acpi_battery_read_info, PDE_DATA(inode));
 575 }
 576
 577 static int acpi_battery_read_state(struct seq_file *seq, void *offset)
 578 {
 579         struct acpi_battery *battery = seq->private;
 580         struct acpi_sbs *sbs = battery->sbs;
 581         int rate;
 582
 583         mutex_lock(&sbs->lock);
 584         seq_printf(seq, "present:                 %s\n",
 585                    (battery->present) ? "yes" : "no");
 586         if (!battery->present)
 587                 goto end;
 588
 589         acpi_battery_get_state(battery);
 590         seq_printf(seq, "capacity state:          %s\n",
 591                    (battery->state & 0x0010) ? "critical" : "ok");
 592         seq_printf(seq, "charging state:          %s\n",
 593                    (battery->rate_now < 0) ? "discharging" :
 594                    ((battery->rate_now > 0) ? "charging" : "charged"));
 595         rate = abs(battery->rate_now) * acpi_battery_ipscale(battery);
 596         rate *= (acpi_battery_mode(battery))?(battery->voltage_now *
 597                         acpi_battery_vscale(battery)/1000):1;
 598         seq_printf(seq, "present rate:            %d%s\n", rate,
 599                    acpi_battery_units(battery));
 600         seq_printf(seq, "remaining capacity:      %i%sh\n",
 601                    battery->capacity_now * acpi_battery_scale(battery),
 602                    acpi_battery_units(battery));
 603         seq_printf(seq, "present voltage:         %i mV\n",
 604                    battery->voltage_now * acpi_battery_vscale(battery));
 605
 606       end:
 607         mutex_unlock(&sbs->lock);
 608         return 0;
 609 }
 610
 611 static int acpi_battery_state_open_fs(struct inode *inode, struct file *file)
 612 {
 613         return single_open(file, acpi_battery_read_state, PDE_DATA(inode));
 614 }
 615
 616 static int acpi_battery_read_alarm(struct seq_file *seq, void *offset)
 617 {
 618         struct acpi_battery *battery = seq->private;
 619         struct acpi_sbs *sbs = battery->sbs;
 620         int result = 0;
 621
 622         mutex_lock(&sbs->lock);
 623
 624         if (!battery->present) {
 625                 seq_printf(seq, "present:                 no\n");
 626                 goto end;
 627         }
 628
 629         acpi_battery_get_alarm(battery);
 630         seq_printf(seq, "alarm:                   ");
 631         if (battery->alarm_capacity)
 632                 seq_printf(seq, "%i%sh\n",
 633                            battery->alarm_capacity *
 634                            acpi_battery_scale(battery),
 635                            acpi_battery_units(battery));
 636         else
 637                 seq_printf(seq, "disabled\n");
 638       end:
 639         mutex_unlock(&sbs->lock);
 640         return result;
 641 }
 642
 643 static ssize_t
 644 acpi_battery_write_alarm(struct file *file, const char __user * buffer,
 645                          size_t count, loff_t * ppos)
 646 {
 647         struct seq_file *seq = file->private_data;
 648         struct acpi_battery *battery = seq->private;
 649         struct acpi_sbs *sbs = battery->sbs;
 650         char alarm_string[12] = { '\0' };
 651         int result = 0;
 652         mutex_lock(&sbs->lock);
 653         if (!battery->present) {
 654                 result = -ENODEV;
 655                 goto end;
 656         }
 657         if (count > sizeof(alarm_string) - 1) {
 658                 result = -EINVAL;
 659                 goto end;
 660         }
 661         if (copy_from_user(alarm_string, buffer, count)) {
 662                 result = -EFAULT;
 663                 goto end;
 664         }
 665         alarm_string[count] = 0;
 666         battery->alarm_capacity = simple_strtoul(alarm_string, NULL, 0) /
 667                                         acpi_battery_scale(battery);
 668         acpi_battery_set_alarm(battery);
 669       end:
 670         mutex_unlock(&sbs->lock);
 671         if (result)
 672                 return result;
 673         return count;
 674 }
 675
 676 static int acpi_battery_alarm_open_fs(struct inode *inode, struct file *file)
 677 {
 678         return single_open(file, acpi_battery_read_alarm, PDE_DATA(inode));
 679 }
 680
 681 static const struct file_operations acpi_battery_info_fops = {
 682         .open = acpi_battery_info_open_fs,
 683         .read = seq_read,
 684         .llseek = seq_lseek,
 685         .release = single_release,
 686         .owner = THIS_MODULE,
 687 };
 688
 689 static const struct file_operations acpi_battery_state_fops = {
 690         .open = acpi_battery_state_open_fs,
 691         .read = seq_read,
 692         .llseek = seq_lseek,
 693         .release = single_release,
 694         .owner = THIS_MODULE,
 695 };
 696
 697 static const struct file_operations acpi_battery_alarm_fops = {
 698         .open = acpi_battery_alarm_open_fs,
 699         .read = seq_read,
 700         .write = acpi_battery_write_alarm,
 701         .llseek = seq_lseek,
 702         .release = single_release,
 703         .owner = THIS_MODULE,
 704 };
 705
 706 /* Legacy AC Adapter Interface */
 707
 708 static struct proc_dir_entry *acpi_ac_dir = NULL;
 709
 710 static int acpi_ac_read_state(struct seq_file *seq, void *offset)
 711 {
 712
 713         struct acpi_sbs *sbs = seq->private;
 714
 715         mutex_lock(&sbs->lock);
 716
 717         seq_printf(seq, "state:                   %s\n",
 718                    sbs->charger_present ? "on-line" : "off-line");
 719
 720         mutex_unlock(&sbs->lock);
 721         return 0;
 722 }
 723
 724 static int acpi_ac_state_open_fs(struct inode *inode, struct file *file)
 725 {
 726         return single_open(file, acpi_ac_read_state, PDE_DATA(inode));
 727 }
 728
 729 static const struct file_operations acpi_ac_state_fops = {
 730         .open = acpi_ac_state_open_fs,
 731         .read = seq_read,
 732         .llseek = seq_lseek,
 733         .release = single_release,
 734         .owner = THIS_MODULE,
 735 };
 736
 737 #endif
 738
 739 /* --------------------------------------------------------------------------
 740                                  Driver Interface
 741    -------------------------------------------------------------------------- */
 742 static int acpi_battery_read(struct acpi_battery *battery)
 743 {
 744         int result = 0, saved_present = battery->present;
 745         u16 state;
 746
 747         if (battery->sbs->manager_present) {
 748                 result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
 749                                 ACPI_SBS_MANAGER, 0x01, (u8 *)&state);
 750                 if (!result)
 751                         battery->present = state & (1 << battery->id);
 752                 state &= 0x0fff;
 753                 state |= 1 << (battery->id + 12);
 754                 acpi_smbus_write(battery->sbs->hc, SMBUS_WRITE_WORD,
 755                                   ACPI_SBS_MANAGER, 0x01, (u8 *)&state, 2);
 756         } else if (battery->id == 0)
 757                 battery->present = 1;
 758         if (result || !battery->present)
 759                 return result;
 760
 761         if (saved_present != battery->present) {
 762                 battery->update_time = 0;
 763                 result = acpi_battery_get_info(battery);
 764                 if (result)
 765                         return result;
 766         }
 767         result = acpi_battery_get_state(battery);
 768         return result;
 769 }
 770
 771 /* Smart Battery */
 772 static int acpi_battery_add(struct acpi_sbs *sbs, int id)
 773 {
 774         struct acpi_battery *battery = &sbs->battery[id];
 775         int result;
 776
 777         battery->id = id;
 778         battery->sbs = sbs;
 779         result = acpi_battery_read(battery);
 780         if (result)
 781                 return result;
 782
 783         sprintf(battery->name, ACPI_BATTERY_DIR_NAME, id);
 784 #ifdef CONFIG_ACPI_PROCFS_POWER
 785         acpi_sbs_add_fs(&battery->proc_entry, acpi_battery_dir,
 786                         battery->name, &acpi_battery_info_fops,
 787                         &acpi_battery_state_fops, &acpi_battery_alarm_fops,
 788                         battery);
 789 #endif
 790         battery->bat.name = battery->name;
 791         battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
 792         if (!acpi_battery_mode(battery)) {
 793                 battery->bat.properties = sbs_charge_battery_props;
 794                 battery->bat.num_properties =
 795                     ARRAY_SIZE(sbs_charge_battery_props);
 796         } else {
 797                 battery->bat.properties = sbs_energy_battery_props;
 798                 battery->bat.num_properties =
 799                     ARRAY_SIZE(sbs_energy_battery_props);
 800         }
 801         battery->bat.get_property = acpi_sbs_battery_get_property;
 802         result = power_supply_register(&sbs->device->dev, &battery->bat);
 803         if (result)
 804                 goto end;
 805         result = device_create_file(battery->bat.dev, &alarm_attr);
 806         if (result)
 807                 goto end;
 808         battery->have_sysfs_alarm = 1;
 809       end:
 810         printk(KERN_INFO PREFIX "%s [%s]: Battery Slot [%s] (battery %s)\n",
 811                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
 812                battery->name, battery->present ? "present" : "absent");
 813         return result;
 814 }
 815
 816 static void acpi_battery_remove(struct acpi_sbs *sbs, int id)
 817 {
 818         struct acpi_battery *battery = &sbs->battery[id];
 819
 820         if (battery->bat.dev) {
 821                 if (battery->have_sysfs_alarm)
 822                         device_remove_file(battery->bat.dev, &alarm_attr);
 823                 power_supply_unregister(&battery->bat);
 824         }
 825 #ifdef CONFIG_ACPI_PROCFS_POWER
 826         proc_remove(battery->proc_entry);
 827         battery->proc_entry = NULL;
 828 #endif
 829 }
 830
 831 static int acpi_charger_add(struct acpi_sbs *sbs)
 832 {
 833         int result;
 834
 835         result = acpi_ac_get_present(sbs);
 836         if (result)
 837                 goto end;
 838 #ifdef CONFIG_ACPI_PROCFS_POWER
 839         result = acpi_sbs_add_fs(&sbs->charger_entry, acpi_ac_dir,
 840                                  ACPI_AC_DIR_NAME, NULL,
 841                                  &acpi_ac_state_fops, NULL, sbs);
 842         if (result)
 843                 goto end;
 844 #endif
 845         sbs->charger.name = "sbs-charger";
 846         sbs->charger.type = POWER_SUPPLY_TYPE_MAINS;
 847         sbs->charger.properties = sbs_ac_props;
 848         sbs->charger.num_properties = ARRAY_SIZE(sbs_ac_props);
 849         sbs->charger.get_property = sbs_get_ac_property;
 850         power_supply_register(&sbs->device->dev, &sbs->charger);
 851         printk(KERN_INFO PREFIX "%s [%s]: AC Adapter [%s] (%s)\n",
 852                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
 853                ACPI_AC_DIR_NAME, sbs->charger_present ? "on-line" : "off-line");
 854       end:
 855         return result;
 856 }
 857
 858 static void acpi_charger_remove(struct acpi_sbs *sbs)
 859 {
 860         if (sbs->charger.dev)
 861                 power_supply_unregister(&sbs->charger);
 862 #ifdef CONFIG_ACPI_PROCFS_POWER
 863         proc_remove(sbs->charger_entry);
 864         sbs->charger_entry = NULL;
 865 #endif
 866 }
 867
 868 static void acpi_sbs_callback(void *context)
 869 {
 870         int id;
 871         struct acpi_sbs *sbs = context;
 872         struct acpi_battery *bat;
 873         u8 saved_charger_state = sbs->charger_present;
 874         u8 saved_battery_state;
 875         acpi_ac_get_present(sbs);
 876         if (sbs->charger_present != saved_charger_state)
 877                 kobject_uevent(&sbs->charger.dev->kobj, KOBJ_CHANGE);
 878
 879         if (sbs->manager_present) {
 880                 for (id = 0; id < MAX_SBS_BAT; ++id) {
 881                         if (!(sbs->batteries_supported & (1 << id)))
 882                                 continue;
 883                         bat = &sbs->battery[id];
 884                         saved_battery_state = bat->present;
 885                         acpi_battery_read(bat);
 886                         if (saved_battery_state == bat->present)
 887                                 continue;
 888                         kobject_uevent(&bat->bat.dev->kobj, KOBJ_CHANGE);
 889                 }
 890         }
 891 }
 892
 893 static int acpi_sbs_add(struct acpi_device *device)
 894 {
 895         struct acpi_sbs *sbs;
 896         int result = 0;
 897         int id;
 898
 899         sbs = kzalloc(sizeof(struct acpi_sbs), GFP_KERNEL);
 900         if (!sbs) {
 901                 result = -ENOMEM;
 902                 goto end;
 903         }
 904
 905         mutex_init(&sbs->lock);
 906
 907         sbs->hc = acpi_driver_data(device->parent);
 908         sbs->device = device;
 909         strcpy(acpi_device_name(device), ACPI_SBS_DEVICE_NAME);
 910         strcpy(acpi_device_class(device), ACPI_SBS_CLASS);
 911         device->driver_data = sbs;
 912
 913         result = acpi_charger_add(sbs);
 914         if (result)
 915                 goto end;
 916
 917         result = acpi_manager_get_info(sbs);
 918         if (!result) {
 919                 sbs->manager_present = 1;
 920                 for (id = 0; id < MAX_SBS_BAT; ++id)
 921                         if ((sbs->batteries_supported & (1 << id)))
 922                                 acpi_battery_add(sbs, id);
 923         } else
 924                 acpi_battery_add(sbs, 0);
 925         acpi_smbus_register_callback(sbs->hc, acpi_sbs_callback, sbs);
 926       end:
 927         if (result)
 928                 acpi_sbs_remove(device);
 929         return result;
 930 }
 931
 932 static int acpi_sbs_remove(struct acpi_device *device)
 933 {
 934         struct acpi_sbs *sbs;
 935         int id;
 936
 937         if (!device)
 938                 return -EINVAL;
 939         sbs = acpi_driver_data(device);
 940         if (!sbs)
 941                 return -EINVAL;
 942         mutex_lock(&sbs->lock);
 943         acpi_smbus_unregister_callback(sbs->hc);
 944         for (id = 0; id < MAX_SBS_BAT; ++id)
 945                 acpi_battery_remove(sbs, id);
 946         acpi_charger_remove(sbs);
 947         mutex_unlock(&sbs->lock);
 948         mutex_destroy(&sbs->lock);
 949         kfree(sbs);
 950         return 0;
 951 }
 952
 953 static void acpi_sbs_rmdirs(void)
 954 {
 955 #ifdef CONFIG_ACPI_PROCFS_POWER
 956         if (acpi_ac_dir) {
 957                 acpi_unlock_ac_dir(acpi_ac_dir);
 958                 acpi_ac_dir = NULL;
 959         }
 960         if (acpi_battery_dir) {
 961                 acpi_unlock_battery_dir(acpi_battery_dir);
 962                 acpi_battery_dir = NULL;
 963         }
 964 #endif
 965 }
 966
 967 #ifdef CONFIG_PM_SLEEP
 968 static int acpi_sbs_resume(struct device *dev)
 969 {
 970         struct acpi_sbs *sbs;
 971         if (!dev)
 972                 return -EINVAL;
 973         sbs = to_acpi_device(dev)->driver_data;
 974         acpi_sbs_callback(sbs);
 975         return 0;
 976 }
 977 #endif
 978
 979 static SIMPLE_DEV_PM_OPS(acpi_sbs_pm, NULL, acpi_sbs_resume);
 980
 981 static struct acpi_driver acpi_sbs_driver = {
 982         .name = "sbs",
 983         .class = ACPI_SBS_CLASS,
 984         .ids = sbs_device_ids,
 985         .ops = {
 986                 .add = acpi_sbs_add,
 987                 .remove = acpi_sbs_remove,
 988                 },
 989         .drv.pm = &acpi_sbs_pm,
 990 };
 991
 992 static int __init acpi_sbs_init(void)
 993 {
 994         int result = 0;
 995
 996         if (acpi_disabled)
 997                 return -ENODEV;
 998 #ifdef CONFIG_ACPI_PROCFS_POWER
 999         acpi_ac_dir = acpi_lock_ac_dir();
1000         if (!acpi_ac_dir)
1001                 return -ENODEV;
1002         acpi_battery_dir = acpi_lock_battery_dir();
1003         if (!acpi_battery_dir) {
1004                 acpi_sbs_rmdirs();
1005                 return -ENODEV;
1006         }
1007 #endif
1008         result = acpi_bus_register_driver(&acpi_sbs_driver);
1009         if (result < 0) {
1010                 acpi_sbs_rmdirs();
1011                 return -ENODEV;
1012         }
1013         return 0;
1014 }
1015
1016 static void __exit acpi_sbs_exit(void)
1017 {
1018         acpi_bus_unregister_driver(&acpi_sbs_driver);
1019         acpi_sbs_rmdirs();
1020         return;
1021 }
1022
1023 module_init(acpi_sbs_init);
1024 module_exit(acpi_sbs_exit);