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 PREFIX "ACPI: "
  50
  51 #define ACPI_SBS_CLASS                  "sbs"
  52 #define ACPI_AC_CLASS                   "ac_adapter"
  53 #define ACPI_BATTERY_CLASS              "battery"
  54 #define ACPI_SBS_DEVICE_NAME            "Smart Battery System"
  55 #define ACPI_SBS_FILE_INFO              "info"
  56 #define ACPI_SBS_FILE_STATE             "state"
  57 #define ACPI_SBS_FILE_ALARM             "alarm"
  58 #define ACPI_BATTERY_DIR_NAME           "BAT%i"
  59 #define ACPI_AC_DIR_NAME                "AC0"
  60
  61 #define ACPI_SBS_NOTIFY_STATUS          0x80
  62 #define ACPI_SBS_NOTIFY_INFO            0x81
  63
  64 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
  65 MODULE_DESCRIPTION("Smart Battery System ACPI interface driver");
  66 MODULE_LICENSE("GPL");
  67
  68 static unsigned int cache_time = 1000;
  69 module_param(cache_time, uint, 0644);
  70 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
  71
  72 extern struct proc_dir_entry *acpi_lock_ac_dir(void);
  73 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
  74 extern void acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
  75 extern void acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
  76
  77 #define MAX_SBS_BAT                     4
  78 #define ACPI_SBS_BLOCK_MAX              32
  79
  80 static const struct acpi_device_id sbs_device_ids[] = {
  81         {"ACPI0002", 0},
  82         {"", 0},
  83 };
  84 MODULE_DEVICE_TABLE(acpi, sbs_device_ids);
  85
  86 struct acpi_battery {
  87 #ifdef CONFIG_ACPI_SYSFS_POWER
  88         struct power_supply bat;
  89 #endif
  90         struct acpi_sbs *sbs;
  91 #ifdef CONFIG_ACPI_PROCFS_POWER
  92         struct proc_dir_entry *proc_entry;
  93 #endif
  94         unsigned long update_time;
  95         char name[8];
  96         char manufacturer_name[ACPI_SBS_BLOCK_MAX];
  97         char device_name[ACPI_SBS_BLOCK_MAX];
  98         char device_chemistry[ACPI_SBS_BLOCK_MAX];
  99         u16 alarm_capacity;
 100         u16 full_charge_capacity;
 101         u16 design_capacity;
 102         u16 design_voltage;
 103         u16 serial_number;
 104         u16 cycle_count;
 105         u16 temp_now;
 106         u16 voltage_now;
 107         s16 rate_now;
 108         s16 rate_avg;
 109         u16 capacity_now;
 110         u16 state_of_charge;
 111         u16 state;
 112         u16 mode;
 113         u16 spec;
 114         u8 id;
 115         u8 present:1;
 116         u8 have_sysfs_alarm:1;
 117 };
 118
 119 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
 120
 121 struct acpi_sbs {
 122 #ifdef CONFIG_ACPI_SYSFS_POWER
 123         struct power_supply charger;
 124 #endif
 125         struct acpi_device *device;
 126         struct acpi_smb_hc *hc;
 127         struct mutex lock;
 128 #ifdef CONFIG_ACPI_PROCFS_POWER
 129         struct proc_dir_entry *charger_entry;
 130 #endif
 131         struct acpi_battery battery[MAX_SBS_BAT];
 132         u8 batteries_supported:4;
 133         u8 manager_present:1;
 134         u8 charger_present:1;
 135 };
 136
 137 #define to_acpi_sbs(x) container_of(x, struct acpi_sbs, charger)
 138
 139 static inline int battery_scale(int log)
 140 {
 141         int scale = 1;
 142         while (log--)
 143                 scale *= 10;
 144         return scale;
 145 }
 146
 147 static inline int acpi_battery_vscale(struct acpi_battery *battery)
 148 {
 149         return battery_scale((battery->spec & 0x0f00) >> 8);
 150 }
 151
 152 static inline int acpi_battery_ipscale(struct acpi_battery *battery)
 153 {
 154         return battery_scale((battery->spec & 0xf000) >> 12);
 155 }
 156
 157 static inline int acpi_battery_mode(struct acpi_battery *battery)
 158 {
 159         return (battery->mode & 0x8000);
 160 }
 161
 162 static inline int acpi_battery_scale(struct acpi_battery *battery)
 163 {
 164         return (acpi_battery_mode(battery) ? 10 : 1) *
 165             acpi_battery_ipscale(battery);
 166 }
 167
 168 #ifdef CONFIG_ACPI_SYSFS_POWER
 169 static int sbs_get_ac_property(struct power_supply *psy,
 170                                enum power_supply_property psp,
 171                                union power_supply_propval *val)
 172 {
 173         struct acpi_sbs *sbs = to_acpi_sbs(psy);
 174         switch (psp) {
 175         case POWER_SUPPLY_PROP_ONLINE:
 176                 val->intval = sbs->charger_present;
 177                 break;
 178         default:
 179                 return -EINVAL;
 180         }
 181         return 0;
 182 }
 183
 184 static int acpi_battery_technology(struct acpi_battery *battery)
 185 {
 186         if (!strcasecmp("NiCd", battery->device_chemistry))
 187                 return POWER_SUPPLY_TECHNOLOGY_NiCd;
 188         if (!strcasecmp("NiMH", battery->device_chemistry))
 189                 return POWER_SUPPLY_TECHNOLOGY_NiMH;
 190         if (!strcasecmp("LION", battery->device_chemistry))
 191                 return POWER_SUPPLY_TECHNOLOGY_LION;
 192         if (!strcasecmp("LiP", battery->device_chemistry))
 193                 return POWER_SUPPLY_TECHNOLOGY_LIPO;
 194         return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 195 }
 196
 197 static int acpi_sbs_battery_get_property(struct power_supply *psy,
 198                                          enum power_supply_property psp,
 199                                          union power_supply_propval *val)
 200 {
 201         struct acpi_battery *battery = to_acpi_battery(psy);
 202
 203         if ((!battery->present) && psp != POWER_SUPPLY_PROP_PRESENT)
 204                 return -ENODEV;
 205         switch (psp) {
 206         case POWER_SUPPLY_PROP_STATUS:
 207                 if (battery->rate_now < 0)
 208                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 209                 else if (battery->rate_now > 0)
 210                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 211                 else
 212                         val->intval = POWER_SUPPLY_STATUS_FULL;
 213                 break;
 214         case POWER_SUPPLY_PROP_PRESENT:
 215                 val->intval = battery->present;
 216                 break;
 217         case POWER_SUPPLY_PROP_TECHNOLOGY:
 218                 val->intval = acpi_battery_technology(battery);
 219                 break;
 220         case POWER_SUPPLY_PROP_CYCLE_COUNT:
 221                 val->intval = battery->cycle_count;
 222                 break;
 223         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 224                 val->intval = battery->design_voltage *
 225                         acpi_battery_vscale(battery) * 1000;
 226                 break;
 227         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 228                 val->intval = battery->voltage_now *
 229                                 acpi_battery_vscale(battery) * 1000;
 230                 break;
 231         case POWER_SUPPLY_PROP_CURRENT_NOW:
 232         case POWER_SUPPLY_PROP_POWER_NOW:
 233                 val->intval = abs(battery->rate_now) *
 234                                 acpi_battery_ipscale(battery) * 1000;
 235                 break;
 236         case POWER_SUPPLY_PROP_CURRENT_AVG:
 237         case POWER_SUPPLY_PROP_POWER_AVG:
 238                 val->intval = abs(battery->rate_avg) *
 239                                 acpi_battery_ipscale(battery) * 1000;
 240                 break;
 241         case POWER_SUPPLY_PROP_CAPACITY:
 242                 val->intval = battery->state_of_charge;
 243                 break;
 244         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 245         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 246                 val->intval = battery->design_capacity *
 247                         acpi_battery_scale(battery) * 1000;
 248                 break;
 249         case POWER_SUPPLY_PROP_CHARGE_FULL:
 250         case POWER_SUPPLY_PROP_ENERGY_FULL:
 251                 val->intval = battery->full_charge_capacity *
 252                         acpi_battery_scale(battery) * 1000;
 253                 break;
 254         case POWER_SUPPLY_PROP_CHARGE_NOW:
 255         case POWER_SUPPLY_PROP_ENERGY_NOW:
 256                 val->intval = battery->capacity_now *
 257                                 acpi_battery_scale(battery) * 1000;
 258                 break;
 259         case POWER_SUPPLY_PROP_TEMP:
 260                 val->intval = battery->temp_now - 2730; // dK -> dC
 261                 break;
 262         case POWER_SUPPLY_PROP_MODEL_NAME:
 263                 val->strval = battery->device_name;
 264                 break;
 265         case POWER_SUPPLY_PROP_MANUFACTURER:
 266                 val->strval = battery->manufacturer_name;
 267                 break;
 268         default:
 269                 return -EINVAL;
 270         }
 271         return 0;
 272 }
 273
 274 static enum power_supply_property sbs_ac_props[] = {
 275         POWER_SUPPLY_PROP_ONLINE,
 276 };
 277
 278 static enum power_supply_property sbs_charge_battery_props[] = {
 279         POWER_SUPPLY_PROP_STATUS,
 280         POWER_SUPPLY_PROP_PRESENT,
 281         POWER_SUPPLY_PROP_TECHNOLOGY,
 282         POWER_SUPPLY_PROP_CYCLE_COUNT,
 283         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 284         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 285         POWER_SUPPLY_PROP_CURRENT_NOW,
 286         POWER_SUPPLY_PROP_CURRENT_AVG,
 287         POWER_SUPPLY_PROP_CAPACITY,
 288         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 289         POWER_SUPPLY_PROP_CHARGE_FULL,
 290         POWER_SUPPLY_PROP_CHARGE_NOW,
 291         POWER_SUPPLY_PROP_TEMP,
 292         POWER_SUPPLY_PROP_MODEL_NAME,
 293         POWER_SUPPLY_PROP_MANUFACTURER,
 294 };
 295
 296 static enum power_supply_property sbs_energy_battery_props[] = {
 297         POWER_SUPPLY_PROP_STATUS,
 298         POWER_SUPPLY_PROP_PRESENT,
 299         POWER_SUPPLY_PROP_TECHNOLOGY,
 300         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 301         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 302         POWER_SUPPLY_PROP_CURRENT_NOW,
 303         POWER_SUPPLY_PROP_CURRENT_AVG,
 304         POWER_SUPPLY_PROP_POWER_NOW,
 305         POWER_SUPPLY_PROP_POWER_AVG,
 306         POWER_SUPPLY_PROP_CAPACITY,
 307         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 308         POWER_SUPPLY_PROP_ENERGY_FULL,
 309         POWER_SUPPLY_PROP_ENERGY_NOW,
 310         POWER_SUPPLY_PROP_TEMP,
 311         POWER_SUPPLY_PROP_MODEL_NAME,
 312         POWER_SUPPLY_PROP_MANUFACTURER,
 313 };
 314
 315 #endif
 316
 317 /* --------------------------------------------------------------------------
 318                             Smart Battery System Management
 319    -------------------------------------------------------------------------- */
 320
 321 struct acpi_battery_reader {
 322         u8 command;             /* command for battery */
 323         u8 mode;                /* word or block? */
 324         size_t offset;          /* offset inside struct acpi_sbs_battery */
 325 };
 326
 327 static struct acpi_battery_reader info_readers[] = {
 328         {0x01, SMBUS_READ_WORD, offsetof(struct acpi_battery, alarm_capacity)},
 329         {0x03, SMBUS_READ_WORD, offsetof(struct acpi_battery, mode)},
 330         {0x10, SMBUS_READ_WORD, offsetof(struct acpi_battery, full_charge_capacity)},
 331         {0x17, SMBUS_READ_WORD, offsetof(struct acpi_battery, cycle_count)},
 332         {0x18, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_capacity)},
 333         {0x19, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_voltage)},
 334         {0x1a, SMBUS_READ_WORD, offsetof(struct acpi_battery, spec)},
 335         {0x1c, SMBUS_READ_WORD, offsetof(struct acpi_battery, serial_number)},
 336         {0x20, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, manufacturer_name)},
 337         {0x21, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_name)},
 338         {0x22, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_chemistry)},
 339 };
 340
 341 static struct acpi_battery_reader state_readers[] = {
 342         {0x08, SMBUS_READ_WORD, offsetof(struct acpi_battery, temp_now)},
 343         {0x09, SMBUS_READ_WORD, offsetof(struct acpi_battery, voltage_now)},
 344         {0x0a, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_now)},
 345         {0x0b, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_avg)},
 346         {0x0f, SMBUS_READ_WORD, offsetof(struct acpi_battery, capacity_now)},
 347         {0x0e, SMBUS_READ_WORD, offsetof(struct acpi_battery, state_of_charge)},
 348         {0x16, SMBUS_READ_WORD, offsetof(struct acpi_battery, state)},
 349 };
 350
 351 static int acpi_manager_get_info(struct acpi_sbs *sbs)
 352 {
 353         int result = 0;
 354         u16 battery_system_info;
 355
 356         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
 357                                  0x04, (u8 *)&battery_system_info);
 358         if (!result)
 359                 sbs->batteries_supported = battery_system_info & 0x000f;
 360         return result;
 361 }
 362
 363 static int acpi_battery_get_info(struct acpi_battery *battery)
 364 {
 365         int i, result = 0;
 366
 367         for (i = 0; i < ARRAY_SIZE(info_readers); ++i) {
 368                 result = acpi_smbus_read(battery->sbs->hc,
 369                                          info_readers[i].mode,
 370                                          ACPI_SBS_BATTERY,
 371                                          info_readers[i].command,
 372                                          (u8 *) battery +
 373                                                 info_readers[i].offset);
 374                 if (result)
 375                         break;
 376         }
 377         return result;
 378 }
 379
 380 static int acpi_battery_get_state(struct acpi_battery *battery)
 381 {
 382         int i, result = 0;
 383
 384         if (battery->update_time &&
 385             time_before(jiffies, battery->update_time +
 386                                 msecs_to_jiffies(cache_time)))
 387                 return 0;
 388         for (i = 0; i < ARRAY_SIZE(state_readers); ++i) {
 389                 result = acpi_smbus_read(battery->sbs->hc,
 390                                          state_readers[i].mode,
 391                                          ACPI_SBS_BATTERY,
 392                                          state_readers[i].command,
 393                                          (u8 *)battery +
 394                                                 state_readers[i].offset);
 395                 if (result)
 396                         goto end;
 397         }
 398       end:
 399         battery->update_time = jiffies;
 400         return result;
 401 }
 402
 403 static int acpi_battery_get_alarm(struct acpi_battery *battery)
 404 {
 405         return acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
 406                                  ACPI_SBS_BATTERY, 0x01,
 407                                  (u8 *)&battery->alarm_capacity);
 408 }
 409
 410 static int acpi_battery_set_alarm(struct acpi_battery *battery)
 411 {
 412         struct acpi_sbs *sbs = battery->sbs;
 413         u16 value, sel = 1 << (battery->id + 12);
 414
 415         int ret;
 416
 417
 418         if (sbs->manager_present) {
 419                 ret = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
 420                                 0x01, (u8 *)&value);
 421                 if (ret)
 422                         goto end;
 423                 if ((value & 0xf000) != sel) {
 424                         value &= 0x0fff;
 425                         value |= sel;
 426                 ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD,
 427                                          ACPI_SBS_MANAGER,
 428                                          0x01, (u8 *)&value, 2);
 429                 if (ret)
 430                         goto end;
 431                 }
 432         }
 433         ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD, ACPI_SBS_BATTERY,
 434                                 0x01, (u8 *)&battery->alarm_capacity, 2);
 435       end:
 436         return ret;
 437 }
 438
 439 static int acpi_ac_get_present(struct acpi_sbs *sbs)
 440 {
 441         int result;
 442         u16 status;
 443
 444         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_CHARGER,
 445                                  0x13, (u8 *) & status);
 446         if (!result)
 447                 sbs->charger_present = (status >> 15) & 0x1;
 448         return result;
 449 }
 450
 451 #ifdef CONFIG_ACPI_SYSFS_POWER
 452 static ssize_t acpi_battery_alarm_show(struct device *dev,
 453                                         struct device_attribute *attr,
 454                                         char *buf)
 455 {
 456         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 457         acpi_battery_get_alarm(battery);
 458         return sprintf(buf, "%d\n", battery->alarm_capacity *
 459                                 acpi_battery_scale(battery) * 1000);
 460 }
 461
 462 static ssize_t acpi_battery_alarm_store(struct device *dev,
 463                                         struct device_attribute *attr,
 464                                         const char *buf, size_t count)
 465 {
 466         unsigned long x;
 467         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 468         if (sscanf(buf, "%ld\n", &x) == 1)
 469                 battery->alarm_capacity = x /
 470                         (1000 * acpi_battery_scale(battery));
 471         if (battery->present)
 472                 acpi_battery_set_alarm(battery);
 473         return count;
 474 }
 475
 476 static struct device_attribute alarm_attr = {
 477         .attr = {.name = "alarm", .mode = 0644},
 478         .show = acpi_battery_alarm_show,
 479         .store = acpi_battery_alarm_store,
 480 };
 481 #endif
 482
 483 /* --------------------------------------------------------------------------
 484                               FS Interface (/proc/acpi)
 485    -------------------------------------------------------------------------- */
 486
 487 #ifdef CONFIG_ACPI_PROCFS_POWER
 488 /* Generic Routines */
 489 static int
 490 acpi_sbs_add_fs(struct proc_dir_entry **dir,
 491                 struct proc_dir_entry *parent_dir,
 492                 char *dir_name,
 493                 const struct file_operations *info_fops,
 494                 const struct file_operations *state_fops,
 495                 const struct file_operations *alarm_fops, void *data)
 496 {
 497         if (!*dir) {
 498                 *dir = proc_mkdir(dir_name, parent_dir);
 499                 if (!*dir) {
 500                         return -ENODEV;
 501                 }
 502         }
 503
 504         /* 'info' [R] */
 505         if (info_fops)
 506                 proc_create_data(ACPI_SBS_FILE_INFO, S_IRUGO, *dir,
 507                                  info_fops, data);
 508
 509         /* 'state' [R] */
 510         if (state_fops)
 511                 proc_create_data(ACPI_SBS_FILE_STATE, S_IRUGO, *dir,
 512                                  state_fops, data);
 513
 514         /* 'alarm' [R/W] */
 515         if (alarm_fops)
 516                 proc_create_data(ACPI_SBS_FILE_ALARM, S_IRUGO, *dir,
 517                                  alarm_fops, data);
 518         return 0;
 519 }
 520
 521 static void
 522 acpi_sbs_remove_fs(struct proc_dir_entry **dir,
 523                            struct proc_dir_entry *parent_dir)
 524 {
 525         if (*dir) {
 526                 remove_proc_entry(ACPI_SBS_FILE_INFO, *dir);
 527                 remove_proc_entry(ACPI_SBS_FILE_STATE, *dir);
 528                 remove_proc_entry(ACPI_SBS_FILE_ALARM, *dir);
 529                 remove_proc_entry((*dir)->name, parent_dir);
 530                 *dir = NULL;
 531         }
 532 }
 533
 534 /* Smart Battery Interface */
 535 static struct proc_dir_entry *acpi_battery_dir = NULL;
 536
 537 static inline char *acpi_battery_units(struct acpi_battery *battery)
 538 {
 539         return acpi_battery_mode(battery) ? " mW" : " mA";
 540 }
 541
 542
 543 static int acpi_battery_read_info(struct seq_file *seq, void *offset)
 544 {
 545         struct acpi_battery *battery = seq->private;
 546         struct acpi_sbs *sbs = battery->sbs;
 547         int result = 0;
 548
 549         mutex_lock(&sbs->lock);
 550
 551         seq_printf(seq, "present:                 %s\n",
 552                    (battery->present) ? "yes" : "no");
 553         if (!battery->present)
 554                 goto end;
 555
 556         seq_printf(seq, "design capacity:         %i%sh\n",
 557                    battery->design_capacity * acpi_battery_scale(battery),
 558                    acpi_battery_units(battery));
 559         seq_printf(seq, "last full capacity:      %i%sh\n",
 560                    battery->full_charge_capacity * acpi_battery_scale(battery),
 561                    acpi_battery_units(battery));
 562         seq_printf(seq, "battery technology:      rechargeable\n");
 563         seq_printf(seq, "design voltage:          %i mV\n",
 564                    battery->design_voltage * acpi_battery_vscale(battery));
 565         seq_printf(seq, "design capacity warning: unknown\n");
 566         seq_printf(seq, "design capacity low:     unknown\n");
 567         seq_printf(seq, "cycle count:             %i\n", battery->cycle_count);
 568         seq_printf(seq, "capacity granularity 1:  unknown\n");
 569         seq_printf(seq, "capacity granularity 2:  unknown\n");
 570         seq_printf(seq, "model number:            %s\n", battery->device_name);
 571         seq_printf(seq, "serial number:           %i\n",
 572                    battery->serial_number);
 573         seq_printf(seq, "battery type:            %s\n",
 574                    battery->device_chemistry);
 575         seq_printf(seq, "OEM info:                %s\n",
 576                    battery->manufacturer_name);
 577       end:
 578         mutex_unlock(&sbs->lock);
 579         return result;
 580 }
 581
 582 static int acpi_battery_info_open_fs(struct inode *inode, struct file *file)
 583 {
 584         return single_open(file, acpi_battery_read_info, PDE(inode)->data);
 585 }
 586
 587 static int acpi_battery_read_state(struct seq_file *seq, void *offset)
 588 {
 589         struct acpi_battery *battery = seq->private;
 590         struct acpi_sbs *sbs = battery->sbs;
 591         int rate;
 592
 593         mutex_lock(&sbs->lock);
 594         seq_printf(seq, "present:                 %s\n",
 595                    (battery->present) ? "yes" : "no");
 596         if (!battery->present)
 597                 goto end;
 598
 599         acpi_battery_get_state(battery);
 600         seq_printf(seq, "capacity state:          %s\n",
 601                    (battery->state & 0x0010) ? "critical" : "ok");
 602         seq_printf(seq, "charging state:          %s\n",
 603                    (battery->rate_now < 0) ? "discharging" :
 604                    ((battery->rate_now > 0) ? "charging" : "charged"));
 605         rate = abs(battery->rate_now) * acpi_battery_ipscale(battery);
 606         rate *= (acpi_battery_mode(battery))?(battery->voltage_now *
 607                         acpi_battery_vscale(battery)/1000):1;
 608         seq_printf(seq, "present rate:            %d%s\n", rate,
 609                    acpi_battery_units(battery));
 610         seq_printf(seq, "remaining capacity:      %i%sh\n",
 611                    battery->capacity_now * acpi_battery_scale(battery),
 612                    acpi_battery_units(battery));
 613         seq_printf(seq, "present voltage:         %i mV\n",
 614                    battery->voltage_now * acpi_battery_vscale(battery));
 615
 616       end:
 617         mutex_unlock(&sbs->lock);
 618         return 0;
 619 }
 620
 621 static int acpi_battery_state_open_fs(struct inode *inode, struct file *file)
 622 {
 623         return single_open(file, acpi_battery_read_state, PDE(inode)->data);
 624 }
 625
 626 static int acpi_battery_read_alarm(struct seq_file *seq, void *offset)
 627 {
 628         struct acpi_battery *battery = seq->private;
 629         struct acpi_sbs *sbs = battery->sbs;
 630         int result = 0;
 631
 632         mutex_lock(&sbs->lock);
 633
 634         if (!battery->present) {
 635                 seq_printf(seq, "present:                 no\n");
 636                 goto end;
 637         }
 638
 639         acpi_battery_get_alarm(battery);
 640         seq_printf(seq, "alarm:                   ");
 641         if (battery->alarm_capacity)
 642                 seq_printf(seq, "%i%sh\n",
 643                            battery->alarm_capacity *
 644                            acpi_battery_scale(battery),
 645                            acpi_battery_units(battery));
 646         else
 647                 seq_printf(seq, "disabled\n");
 648       end:
 649         mutex_unlock(&sbs->lock);
 650         return result;
 651 }
 652
 653 static ssize_t
 654 acpi_battery_write_alarm(struct file *file, const char __user * buffer,
 655                          size_t count, loff_t * ppos)
 656 {
 657         struct seq_file *seq = file->private_data;
 658         struct acpi_battery *battery = seq->private;
 659         struct acpi_sbs *sbs = battery->sbs;
 660         char alarm_string[12] = { '\0' };
 661         int result = 0;
 662         mutex_lock(&sbs->lock);
 663         if (!battery->present) {
 664                 result = -ENODEV;
 665                 goto end;
 666         }
 667         if (count > sizeof(alarm_string) - 1) {
 668                 result = -EINVAL;
 669                 goto end;
 670         }
 671         if (copy_from_user(alarm_string, buffer, count)) {
 672                 result = -EFAULT;
 673                 goto end;
 674         }
 675         alarm_string[count] = 0;
 676         battery->alarm_capacity = simple_strtoul(alarm_string, NULL, 0) /
 677                                         acpi_battery_scale(battery);
 678         acpi_battery_set_alarm(battery);
 679       end:
 680         mutex_unlock(&sbs->lock);
 681         if (result)
 682                 return result;
 683         return count;
 684 }
 685
 686 static int acpi_battery_alarm_open_fs(struct inode *inode, struct file *file)
 687 {
 688         return single_open(file, acpi_battery_read_alarm, PDE(inode)->data);
 689 }
 690
 691 static const struct file_operations acpi_battery_info_fops = {
 692         .open = acpi_battery_info_open_fs,
 693         .read = seq_read,
 694         .llseek = seq_lseek,
 695         .release = single_release,
 696         .owner = THIS_MODULE,
 697 };
 698
 699 static const struct file_operations acpi_battery_state_fops = {
 700         .open = acpi_battery_state_open_fs,
 701         .read = seq_read,
 702         .llseek = seq_lseek,
 703         .release = single_release,
 704         .owner = THIS_MODULE,
 705 };
 706
 707 static const struct file_operations acpi_battery_alarm_fops = {
 708         .open = acpi_battery_alarm_open_fs,
 709         .read = seq_read,
 710         .write = acpi_battery_write_alarm,
 711         .llseek = seq_lseek,
 712         .release = single_release,
 713         .owner = THIS_MODULE,
 714 };
 715
 716 /* Legacy AC Adapter Interface */
 717
 718 static struct proc_dir_entry *acpi_ac_dir = NULL;
 719
 720 static int acpi_ac_read_state(struct seq_file *seq, void *offset)
 721 {
 722
 723         struct acpi_sbs *sbs = seq->private;
 724
 725         mutex_lock(&sbs->lock);
 726
 727         seq_printf(seq, "state:                   %s\n",
 728                    sbs->charger_present ? "on-line" : "off-line");
 729
 730         mutex_unlock(&sbs->lock);
 731         return 0;
 732 }
 733
 734 static int acpi_ac_state_open_fs(struct inode *inode, struct file *file)
 735 {
 736         return single_open(file, acpi_ac_read_state, PDE(inode)->data);
 737 }
 738
 739 static const struct file_operations acpi_ac_state_fops = {
 740         .open = acpi_ac_state_open_fs,
 741         .read = seq_read,
 742         .llseek = seq_lseek,
 743         .release = single_release,
 744         .owner = THIS_MODULE,
 745 };
 746
 747 #endif
 748
 749 /* --------------------------------------------------------------------------
 750                                  Driver Interface
 751    -------------------------------------------------------------------------- */
 752 static int acpi_battery_read(struct acpi_battery *battery)
 753 {
 754         int result = 0, saved_present = battery->present;
 755         u16 state;
 756
 757         if (battery->sbs->manager_present) {
 758                 result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
 759                                 ACPI_SBS_MANAGER, 0x01, (u8 *)&state);
 760                 if (!result)
 761                         battery->present = state & (1 << battery->id);
 762                 state &= 0x0fff;
 763                 state |= 1 << (battery->id + 12);
 764                 acpi_smbus_write(battery->sbs->hc, SMBUS_WRITE_WORD,
 765                                   ACPI_SBS_MANAGER, 0x01, (u8 *)&state, 2);
 766         } else if (battery->id == 0)
 767                 battery->present = 1;
 768         if (result || !battery->present)
 769                 return result;
 770
 771         if (saved_present != battery->present) {
 772                 battery->update_time = 0;
 773                 result = acpi_battery_get_info(battery);
 774                 if (result)
 775                         return result;
 776         }
 777         result = acpi_battery_get_state(battery);
 778         return result;
 779 }
 780
 781 /* Smart Battery */
 782 static int acpi_battery_add(struct acpi_sbs *sbs, int id)
 783 {
 784         struct acpi_battery *battery = &sbs->battery[id];
 785         int result;
 786
 787         battery->id = id;
 788         battery->sbs = sbs;
 789         result = acpi_battery_read(battery);
 790         if (result)
 791                 return result;
 792
 793         sprintf(battery->name, ACPI_BATTERY_DIR_NAME, id);
 794 #ifdef CONFIG_ACPI_PROCFS_POWER
 795         acpi_sbs_add_fs(&battery->proc_entry, acpi_battery_dir,
 796                         battery->name, &acpi_battery_info_fops,
 797                         &acpi_battery_state_fops, &acpi_battery_alarm_fops,
 798                         battery);
 799 #endif
 800 #ifdef CONFIG_ACPI_SYSFS_POWER
 801         battery->bat.name = battery->name;
 802         battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
 803         if (!acpi_battery_mode(battery)) {
 804                 battery->bat.properties = sbs_charge_battery_props;
 805                 battery->bat.num_properties =
 806                     ARRAY_SIZE(sbs_charge_battery_props);
 807         } else {
 808                 battery->bat.properties = sbs_energy_battery_props;
 809                 battery->bat.num_properties =
 810                     ARRAY_SIZE(sbs_energy_battery_props);
 811         }
 812         battery->bat.get_property = acpi_sbs_battery_get_property;
 813         result = power_supply_register(&sbs->device->dev, &battery->bat);
 814         if (result)
 815                 goto end;
 816         result = device_create_file(battery->bat.dev, &alarm_attr);
 817         if (result)
 818                 goto end;
 819         battery->have_sysfs_alarm = 1;
 820       end:
 821 #endif
 822         printk(KERN_INFO PREFIX "%s [%s]: Battery Slot [%s] (battery %s)\n",
 823                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
 824                battery->name, battery->present ? "present" : "absent");
 825         return result;
 826 }
 827
 828 static void acpi_battery_remove(struct acpi_sbs *sbs, int id)
 829 {
 830 #if defined(CONFIG_ACPI_SYSFS_POWER) || defined(CONFIG_ACPI_PROCFS_POWER)
 831         struct acpi_battery *battery = &sbs->battery[id];
 832 #endif
 833
 834 #ifdef CONFIG_ACPI_SYSFS_POWER
 835         if (battery->bat.dev) {
 836                 if (battery->have_sysfs_alarm)
 837                         device_remove_file(battery->bat.dev, &alarm_attr);
 838                 power_supply_unregister(&battery->bat);
 839         }
 840 #endif
 841 #ifdef CONFIG_ACPI_PROCFS_POWER
 842         if (battery->proc_entry)
 843                 acpi_sbs_remove_fs(&battery->proc_entry, acpi_battery_dir);
 844 #endif
 845 }
 846
 847 static int acpi_charger_add(struct acpi_sbs *sbs)
 848 {
 849         int result;
 850
 851         result = acpi_ac_get_present(sbs);
 852         if (result)
 853                 goto end;
 854 #ifdef CONFIG_ACPI_PROCFS_POWER
 855         result = acpi_sbs_add_fs(&sbs->charger_entry, acpi_ac_dir,
 856                                  ACPI_AC_DIR_NAME, NULL,
 857                                  &acpi_ac_state_fops, NULL, sbs);
 858         if (result)
 859                 goto end;
 860 #endif
 861 #ifdef CONFIG_ACPI_SYSFS_POWER
 862         sbs->charger.name = "sbs-charger";
 863         sbs->charger.type = POWER_SUPPLY_TYPE_MAINS;
 864         sbs->charger.properties = sbs_ac_props;
 865         sbs->charger.num_properties = ARRAY_SIZE(sbs_ac_props);
 866         sbs->charger.get_property = sbs_get_ac_property;
 867         power_supply_register(&sbs->device->dev, &sbs->charger);
 868 #endif
 869         printk(KERN_INFO PREFIX "%s [%s]: AC Adapter [%s] (%s)\n",
 870                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
 871                ACPI_AC_DIR_NAME, sbs->charger_present ? "on-line" : "off-line");
 872       end:
 873         return result;
 874 }
 875
 876 static void acpi_charger_remove(struct acpi_sbs *sbs)
 877 {
 878 #ifdef CONFIG_ACPI_SYSFS_POWER
 879         if (sbs->charger.dev)
 880                 power_supply_unregister(&sbs->charger);
 881 #endif
 882 #ifdef CONFIG_ACPI_PROCFS_POWER
 883         if (sbs->charger_entry)
 884                 acpi_sbs_remove_fs(&sbs->charger_entry, acpi_ac_dir);
 885 #endif
 886 }
 887
 888 static void acpi_sbs_callback(void *context)
 889 {
 890         int id;
 891         struct acpi_sbs *sbs = context;
 892         struct acpi_battery *bat;
 893         u8 saved_charger_state = sbs->charger_present;
 894         u8 saved_battery_state;
 895         acpi_ac_get_present(sbs);
 896         if (sbs->charger_present != saved_charger_state) {
 897 #ifdef CONFIG_ACPI_PROC_EVENT
 898                 acpi_bus_generate_proc_event4(ACPI_AC_CLASS, ACPI_AC_DIR_NAME,
 899                                               ACPI_SBS_NOTIFY_STATUS,
 900                                               sbs->charger_present);
 901 #endif
 902 #ifdef CONFIG_ACPI_SYSFS_POWER
 903                 kobject_uevent(&sbs->charger.dev->kobj, KOBJ_CHANGE);
 904 #endif
 905         }
 906         if (sbs->manager_present) {
 907                 for (id = 0; id < MAX_SBS_BAT; ++id) {
 908                         if (!(sbs->batteries_supported & (1 << id)))
 909                                 continue;
 910                         bat = &sbs->battery[id];
 911                         saved_battery_state = bat->present;
 912                         acpi_battery_read(bat);
 913                         if (saved_battery_state == bat->present)
 914                                 continue;
 915 #ifdef CONFIG_ACPI_PROC_EVENT
 916                         acpi_bus_generate_proc_event4(ACPI_BATTERY_CLASS,
 917                                                       bat->name,
 918                                                       ACPI_SBS_NOTIFY_STATUS,
 919                                                       bat->present);
 920 #endif
 921 #ifdef CONFIG_ACPI_SYSFS_POWER
 922                         kobject_uevent(&bat->bat.dev->kobj, KOBJ_CHANGE);
 923 #endif
 924                 }
 925         }
 926 }
 927
 928 static int acpi_sbs_remove(struct acpi_device *device, int type);
 929
 930 static int acpi_sbs_add(struct acpi_device *device)
 931 {
 932         struct acpi_sbs *sbs;
 933         int result = 0;
 934         int id;
 935
 936         sbs = kzalloc(sizeof(struct acpi_sbs), GFP_KERNEL);
 937         if (!sbs) {
 938                 result = -ENOMEM;
 939                 goto end;
 940         }
 941
 942         mutex_init(&sbs->lock);
 943
 944         sbs->hc = acpi_driver_data(device->parent);
 945         sbs->device = device;
 946         strcpy(acpi_device_name(device), ACPI_SBS_DEVICE_NAME);
 947         strcpy(acpi_device_class(device), ACPI_SBS_CLASS);
 948         device->driver_data = sbs;
 949
 950         result = acpi_charger_add(sbs);
 951         if (result)
 952                 goto end;
 953
 954         result = acpi_manager_get_info(sbs);
 955         if (!result) {
 956                 sbs->manager_present = 1;
 957                 for (id = 0; id < MAX_SBS_BAT; ++id)
 958                         if ((sbs->batteries_supported & (1 << id)))
 959                                 acpi_battery_add(sbs, id);
 960         } else
 961                 acpi_battery_add(sbs, 0);
 962         acpi_smbus_register_callback(sbs->hc, acpi_sbs_callback, sbs);
 963       end:
 964         if (result)
 965                 acpi_sbs_remove(device, 0);
 966         return result;
 967 }
 968
 969 static int acpi_sbs_remove(struct acpi_device *device, int type)
 970 {
 971         struct acpi_sbs *sbs;
 972         int id;
 973
 974         if (!device)
 975                 return -EINVAL;
 976         sbs = acpi_driver_data(device);
 977         if (!sbs)
 978                 return -EINVAL;
 979         mutex_lock(&sbs->lock);
 980         acpi_smbus_unregister_callback(sbs->hc);
 981         for (id = 0; id < MAX_SBS_BAT; ++id)
 982                 acpi_battery_remove(sbs, id);
 983         acpi_charger_remove(sbs);
 984         mutex_unlock(&sbs->lock);
 985         mutex_destroy(&sbs->lock);
 986         kfree(sbs);
 987         return 0;
 988 }
 989
 990 static void acpi_sbs_rmdirs(void)
 991 {
 992 #ifdef CONFIG_ACPI_PROCFS_POWER
 993         if (acpi_ac_dir) {
 994                 acpi_unlock_ac_dir(acpi_ac_dir);
 995                 acpi_ac_dir = NULL;
 996         }
 997         if (acpi_battery_dir) {
 998                 acpi_unlock_battery_dir(acpi_battery_dir);
 999                 acpi_battery_dir = NULL;
1000         }
1001 #endif
1002 }
1003
1004 static int acpi_sbs_resume(struct acpi_device *device)
1005 {
1006         struct acpi_sbs *sbs;
1007         if (!device)
1008                 return -EINVAL;
1009         sbs = device->driver_data;
1010         acpi_sbs_callback(sbs);
1011         return 0;
1012 }
1013
1014 static struct acpi_driver acpi_sbs_driver = {
1015         .name = "sbs",
1016         .class = ACPI_SBS_CLASS,
1017         .ids = sbs_device_ids,
1018         .ops = {
1019                 .add = acpi_sbs_add,
1020                 .remove = acpi_sbs_remove,
1021                 .resume = acpi_sbs_resume,
1022                 },
1023 };
1024
1025 static int __init acpi_sbs_init(void)
1026 {
1027         int result = 0;
1028
1029         if (acpi_disabled)
1030                 return -ENODEV;
1031 #ifdef CONFIG_ACPI_PROCFS_POWER
1032         acpi_ac_dir = acpi_lock_ac_dir();
1033         if (!acpi_ac_dir)
1034                 return -ENODEV;
1035         acpi_battery_dir = acpi_lock_battery_dir();
1036         if (!acpi_battery_dir) {
1037                 acpi_sbs_rmdirs();
1038                 return -ENODEV;
1039         }
1040 #endif
1041         result = acpi_bus_register_driver(&acpi_sbs_driver);
1042         if (result < 0) {
1043                 acpi_sbs_rmdirs();
1044                 return -ENODEV;
1045         }
1046         return 0;
1047 }
1048
1049 static void __exit acpi_sbs_exit(void)
1050 {
1051         acpi_bus_unregister_driver(&acpi_sbs_driver);
1052         acpi_sbs_rmdirs();
1053         return;
1054 }
1055
1056 module_init(acpi_sbs_init);
1057 module_exit(acpi_sbs_exit);