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 #include <linux/power_supply.h>
  44
  45 #include "sbshc.h"
  46
  47 #define ACPI_SBS_CLASS                  "sbs"
  48 #define ACPI_AC_CLASS                   "ac_adapter"
  49 #define ACPI_BATTERY_CLASS              "battery"
  50 #define ACPI_SBS_DEVICE_NAME            "Smart Battery System"
  51 #define ACPI_SBS_FILE_INFO              "info"
  52 #define ACPI_SBS_FILE_STATE             "state"
  53 #define ACPI_SBS_FILE_ALARM             "alarm"
  54 #define ACPI_BATTERY_DIR_NAME           "BAT%i"
  55 #define ACPI_AC_DIR_NAME                "AC0"
  56
  57 #define ACPI_SBS_NOTIFY_STATUS          0x80
  58 #define ACPI_SBS_NOTIFY_INFO            0x81
  59
  60 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
  61 MODULE_DESCRIPTION("Smart Battery System ACPI interface driver");
  62 MODULE_LICENSE("GPL");
  63
  64 static unsigned int cache_time = 1000;
  65 module_param(cache_time, uint, 0644);
  66 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
  67
  68 extern struct proc_dir_entry *acpi_lock_ac_dir(void);
  69 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
  70 extern void acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
  71 extern void acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
  72
  73 #define MAX_SBS_BAT                     4
  74 #define ACPI_SBS_BLOCK_MAX              32
  75
  76 static const struct acpi_device_id sbs_device_ids[] = {
  77         {"ACPI0002", 0},
  78         {"", 0},
  79 };
  80 MODULE_DEVICE_TABLE(acpi, sbs_device_ids);
  81
  82 struct acpi_battery {
  83         struct power_supply bat;
  84         struct acpi_sbs *sbs;
  85 #ifdef CONFIG_ACPI_PROCFS_POWER
  86         struct proc_dir_entry *proc_entry;
  87 #endif
  88         unsigned long update_time;
  89         char name[8];
  90         char manufacturer_name[ACPI_SBS_BLOCK_MAX];
  91         char device_name[ACPI_SBS_BLOCK_MAX];
  92         char device_chemistry[ACPI_SBS_BLOCK_MAX];
  93         u16 alarm_capacity;
  94         u16 full_charge_capacity;
  95         u16 design_capacity;
  96         u16 design_voltage;
  97         u16 serial_number;
  98         u16 cycle_count;
  99         u16 temp_now;
 100         u16 voltage_now;
 101         s16 current_now;
 102         s16 current_avg;
 103         u16 capacity_now;
 104         u16 state_of_charge;
 105         u16 state;
 106         u16 mode;
 107         u16 spec;
 108         u8 id;
 109         u8 present:1;
 110         u8 have_sysfs_alarm:1;
 111 };
 112
 113 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
 114
 115 struct acpi_sbs {
 116         struct power_supply charger;
 117         struct acpi_device *device;
 118         struct acpi_smb_hc *hc;
 119         struct mutex lock;
 120 #ifdef CONFIG_ACPI_PROCFS_POWER
 121         struct proc_dir_entry *charger_entry;
 122 #endif
 123         struct acpi_battery battery[MAX_SBS_BAT];
 124         u8 batteries_supported:4;
 125         u8 manager_present:1;
 126         u8 charger_present:1;
 127 };
 128
 129 #define to_acpi_sbs(x) container_of(x, struct acpi_sbs, charger)
 130
 131 static inline int battery_scale(int log)
 132 {
 133         int scale = 1;
 134         while (log--)
 135                 scale *= 10;
 136         return scale;
 137 }
 138
 139 static inline int acpi_battery_vscale(struct acpi_battery *battery)
 140 {
 141         return battery_scale((battery->spec & 0x0f00) >> 8);
 142 }
 143
 144 static inline int acpi_battery_ipscale(struct acpi_battery *battery)
 145 {
 146         return battery_scale((battery->spec & 0xf000) >> 12);
 147 }
 148
 149 static inline int acpi_battery_mode(struct acpi_battery *battery)
 150 {
 151         return (battery->mode & 0x8000);
 152 }
 153
 154 static inline int acpi_battery_scale(struct acpi_battery *battery)
 155 {
 156         return (acpi_battery_mode(battery) ? 10 : 1) *
 157             acpi_battery_ipscale(battery);
 158 }
 159
 160 static int sbs_get_ac_property(struct power_supply *psy,
 161                                enum power_supply_property psp,
 162                                union power_supply_propval *val)
 163 {
 164         struct acpi_sbs *sbs = to_acpi_sbs(psy);
 165         switch (psp) {
 166         case POWER_SUPPLY_PROP_ONLINE:
 167                 val->intval = sbs->charger_present;
 168                 break;
 169         default:
 170                 return -EINVAL;
 171         }
 172         return 0;
 173 }
 174
 175 static int acpi_battery_technology(struct acpi_battery *battery)
 176 {
 177         if (!strcasecmp("NiCd", battery->device_chemistry))
 178                 return POWER_SUPPLY_TECHNOLOGY_NiCd;
 179         if (!strcasecmp("NiMH", battery->device_chemistry))
 180                 return POWER_SUPPLY_TECHNOLOGY_NiMH;
 181         if (!strcasecmp("LION", battery->device_chemistry))
 182                 return POWER_SUPPLY_TECHNOLOGY_LION;
 183         if (!strcasecmp("LiP", battery->device_chemistry))
 184                 return POWER_SUPPLY_TECHNOLOGY_LIPO;
 185         return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 186 }
 187
 188 static int acpi_sbs_battery_get_property(struct power_supply *psy,
 189                                          enum power_supply_property psp,
 190                                          union power_supply_propval *val)
 191 {
 192         struct acpi_battery *battery = to_acpi_battery(psy);
 193
 194         if ((!battery->present) && psp != POWER_SUPPLY_PROP_PRESENT)
 195                 return -ENODEV;
 196         switch (psp) {
 197         case POWER_SUPPLY_PROP_STATUS:
 198                 if (battery->current_now < 0)
 199                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 200                 else if (battery->current_now > 0)
 201                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 202                 else
 203                         val->intval = POWER_SUPPLY_STATUS_FULL;
 204                 break;
 205         case POWER_SUPPLY_PROP_PRESENT:
 206                 val->intval = battery->present;
 207                 break;
 208         case POWER_SUPPLY_PROP_TECHNOLOGY:
 209                 val->intval = acpi_battery_technology(battery);
 210                 break;
 211         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 212                 val->intval = battery->design_voltage *
 213                         acpi_battery_vscale(battery) * 1000;
 214                 break;
 215         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 216                 val->intval = battery->voltage_now *
 217                                 acpi_battery_vscale(battery) * 1000;
 218                 break;
 219         case POWER_SUPPLY_PROP_CURRENT_NOW:
 220                 val->intval = abs(battery->current_now) *
 221                                 acpi_battery_ipscale(battery) * 1000;
 222                 break;
 223         case POWER_SUPPLY_PROP_CURRENT_AVG:
 224                 val->intval = abs(battery->current_avg) *
 225                                 acpi_battery_ipscale(battery) * 1000;
 226                 break;
 227         case POWER_SUPPLY_PROP_CAPACITY:
 228                 val->intval = battery->state_of_charge;
 229                 break;
 230         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 231         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 232                 val->intval = battery->design_capacity *
 233                         acpi_battery_scale(battery) * 1000;
 234                 break;
 235         case POWER_SUPPLY_PROP_CHARGE_FULL:
 236         case POWER_SUPPLY_PROP_ENERGY_FULL:
 237                 val->intval = battery->full_charge_capacity *
 238                         acpi_battery_scale(battery) * 1000;
 239                 break;
 240         case POWER_SUPPLY_PROP_CHARGE_NOW:
 241         case POWER_SUPPLY_PROP_ENERGY_NOW:
 242                 val->intval = battery->capacity_now *
 243                                 acpi_battery_scale(battery) * 1000;
 244                 break;
 245         case POWER_SUPPLY_PROP_TEMP:
 246                 val->intval = battery->temp_now - 2730; // dK -> dC
 247                 break;
 248         case POWER_SUPPLY_PROP_MODEL_NAME:
 249                 val->strval = battery->device_name;
 250                 break;
 251         case POWER_SUPPLY_PROP_MANUFACTURER:
 252                 val->strval = battery->manufacturer_name;
 253                 break;
 254         default:
 255                 return -EINVAL;
 256         }
 257         return 0;
 258 }
 259
 260 static enum power_supply_property sbs_ac_props[] = {
 261         POWER_SUPPLY_PROP_ONLINE,
 262 };
 263
 264 static enum power_supply_property sbs_charge_battery_props[] = {
 265         POWER_SUPPLY_PROP_STATUS,
 266         POWER_SUPPLY_PROP_PRESENT,
 267         POWER_SUPPLY_PROP_TECHNOLOGY,
 268         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 269         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 270         POWER_SUPPLY_PROP_CURRENT_NOW,
 271         POWER_SUPPLY_PROP_CURRENT_AVG,
 272         POWER_SUPPLY_PROP_CAPACITY,
 273         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 274         POWER_SUPPLY_PROP_CHARGE_FULL,
 275         POWER_SUPPLY_PROP_CHARGE_NOW,
 276         POWER_SUPPLY_PROP_TEMP,
 277         POWER_SUPPLY_PROP_MODEL_NAME,
 278         POWER_SUPPLY_PROP_MANUFACTURER,
 279 };
 280
 281 static enum power_supply_property sbs_energy_battery_props[] = {
 282         POWER_SUPPLY_PROP_STATUS,
 283         POWER_SUPPLY_PROP_PRESENT,
 284         POWER_SUPPLY_PROP_TECHNOLOGY,
 285         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 286         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 287         POWER_SUPPLY_PROP_CURRENT_NOW,
 288         POWER_SUPPLY_PROP_CURRENT_AVG,
 289         POWER_SUPPLY_PROP_CAPACITY,
 290         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 291         POWER_SUPPLY_PROP_ENERGY_FULL,
 292         POWER_SUPPLY_PROP_ENERGY_NOW,
 293         POWER_SUPPLY_PROP_TEMP,
 294         POWER_SUPPLY_PROP_MODEL_NAME,
 295         POWER_SUPPLY_PROP_MANUFACTURER,
 296 };
 297
 298 /* --------------------------------------------------------------------------
 299                             Smart Battery System Management
 300    -------------------------------------------------------------------------- */
 301
 302 struct acpi_battery_reader {
 303         u8 command;             /* command for battery */
 304         u8 mode;                /* word or block? */
 305         size_t offset;          /* offset inside struct acpi_sbs_battery */
 306 };
 307
 308 static struct acpi_battery_reader info_readers[] = {
 309         {0x01, SMBUS_READ_WORD, offsetof(struct acpi_battery, alarm_capacity)},
 310         {0x03, SMBUS_READ_WORD, offsetof(struct acpi_battery, mode)},
 311         {0x10, SMBUS_READ_WORD, offsetof(struct acpi_battery, full_charge_capacity)},
 312         {0x17, SMBUS_READ_WORD, offsetof(struct acpi_battery, cycle_count)},
 313         {0x18, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_capacity)},
 314         {0x19, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_voltage)},
 315         {0x1a, SMBUS_READ_WORD, offsetof(struct acpi_battery, spec)},
 316         {0x1c, SMBUS_READ_WORD, offsetof(struct acpi_battery, serial_number)},
 317         {0x20, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, manufacturer_name)},
 318         {0x21, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_name)},
 319         {0x22, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_chemistry)},
 320 };
 321
 322 static struct acpi_battery_reader state_readers[] = {
 323         {0x08, SMBUS_READ_WORD, offsetof(struct acpi_battery, temp_now)},
 324         {0x09, SMBUS_READ_WORD, offsetof(struct acpi_battery, voltage_now)},
 325         {0x0a, SMBUS_READ_WORD, offsetof(struct acpi_battery, current_now)},
 326         {0x0b, SMBUS_READ_WORD, offsetof(struct acpi_battery, current_avg)},
 327         {0x0f, SMBUS_READ_WORD, offsetof(struct acpi_battery, capacity_now)},
 328         {0x0e, SMBUS_READ_WORD, offsetof(struct acpi_battery, state_of_charge)},
 329         {0x16, SMBUS_READ_WORD, offsetof(struct acpi_battery, state)},
 330 };
 331
 332 static int acpi_manager_get_info(struct acpi_sbs *sbs)
 333 {
 334         int result = 0;
 335         u16 battery_system_info;
 336
 337         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
 338                                  0x04, (u8 *)&battery_system_info);
 339         if (!result)
 340                 sbs->batteries_supported = battery_system_info & 0x000f;
 341         return result;
 342 }
 343
 344 static int acpi_battery_get_info(struct acpi_battery *battery)
 345 {
 346         int i, result = 0;
 347
 348         for (i = 0; i < ARRAY_SIZE(info_readers); ++i) {
 349                 result = acpi_smbus_read(battery->sbs->hc,
 350                                          info_readers[i].mode,
 351                                          ACPI_SBS_BATTERY,
 352                                          info_readers[i].command,
 353                                          (u8 *) battery +
 354                                                 info_readers[i].offset);
 355                 if (result)
 356                         break;
 357         }
 358         return result;
 359 }
 360
 361 static int acpi_battery_get_state(struct acpi_battery *battery)
 362 {
 363         int i, result = 0;
 364
 365         if (battery->update_time &&
 366             time_before(jiffies, battery->update_time +
 367                                 msecs_to_jiffies(cache_time)))
 368                 return 0;
 369         for (i = 0; i < ARRAY_SIZE(state_readers); ++i) {
 370                 result = acpi_smbus_read(battery->sbs->hc,
 371                                          state_readers[i].mode,
 372                                          ACPI_SBS_BATTERY,
 373                                          state_readers[i].command,
 374                                          (u8 *)battery +
 375                                                 state_readers[i].offset);
 376                 if (result)
 377                         goto end;
 378         }
 379       end:
 380         battery->update_time = jiffies;
 381         return result;
 382 }
 383
 384 static int acpi_battery_get_alarm(struct acpi_battery *battery)
 385 {
 386         return acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
 387                                  ACPI_SBS_BATTERY, 0x01,
 388                                  (u8 *)&battery->alarm_capacity);
 389 }
 390
 391 static int acpi_battery_set_alarm(struct acpi_battery *battery)
 392 {
 393         struct acpi_sbs *sbs = battery->sbs;
 394         u16 value, sel = 1 << (battery->id + 12);
 395
 396         int ret;
 397
 398
 399         if (sbs->manager_present) {
 400                 ret = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
 401                                 0x01, (u8 *)&value);
 402                 if (ret)
 403                         goto end;
 404                 if ((value & 0xf000) != sel) {
 405                         value &= 0x0fff;
 406                         value |= sel;
 407                 ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD,
 408                                          ACPI_SBS_MANAGER,
 409                                          0x01, (u8 *)&value, 2);
 410                 if (ret)
 411                         goto end;
 412                 }
 413         }
 414         ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD, ACPI_SBS_BATTERY,
 415                                 0x01, (u8 *)&battery->alarm_capacity, 2);
 416       end:
 417         return ret;
 418 }
 419
 420 static int acpi_ac_get_present(struct acpi_sbs *sbs)
 421 {
 422         int result;
 423         u16 status;
 424
 425         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_CHARGER,
 426                                  0x13, (u8 *) & status);
 427         if (!result)
 428                 sbs->charger_present = (status >> 15) & 0x1;
 429         return result;
 430 }
 431
 432 static ssize_t acpi_battery_alarm_show(struct device *dev,
 433                                         struct device_attribute *attr,
 434                                         char *buf)
 435 {
 436         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 437         acpi_battery_get_alarm(battery);
 438         return sprintf(buf, "%d\n", battery->alarm_capacity *
 439                                 acpi_battery_scale(battery) * 1000);
 440 }
 441
 442 static ssize_t acpi_battery_alarm_store(struct device *dev,
 443                                         struct device_attribute *attr,
 444                                         const char *buf, size_t count)
 445 {
 446         unsigned long x;
 447         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 448         if (sscanf(buf, "%ld\n", &x) == 1)
 449                 battery->alarm_capacity = x /
 450                         (1000 * acpi_battery_scale(battery));
 451         if (battery->present)
 452                 acpi_battery_set_alarm(battery);
 453         return count;
 454 }
 455
 456 static struct device_attribute alarm_attr = {
 457         .attr = {.name = "alarm", .mode = 0644, .owner = THIS_MODULE},
 458         .show = acpi_battery_alarm_show,
 459         .store = acpi_battery_alarm_store,
 460 };
 461
 462 /* --------------------------------------------------------------------------
 463                               FS Interface (/proc/acpi)
 464    -------------------------------------------------------------------------- */
 465
 466 #ifdef CONFIG_ACPI_PROCFS_POWER
 467 /* Generic Routines */
 468 static int
 469 acpi_sbs_add_fs(struct proc_dir_entry **dir,
 470                 struct proc_dir_entry *parent_dir,
 471                 char *dir_name,
 472                 struct file_operations *info_fops,
 473                 struct file_operations *state_fops,
 474                 struct file_operations *alarm_fops, void *data)
 475 {
 476         struct proc_dir_entry *entry = NULL;
 477
 478         if (!*dir) {
 479                 *dir = proc_mkdir(dir_name, parent_dir);
 480                 if (!*dir) {
 481                         return -ENODEV;
 482                 }
 483                 (*dir)->owner = THIS_MODULE;
 484         }
 485
 486         /* 'info' [R] */
 487         if (info_fops) {
 488                 entry = create_proc_entry(ACPI_SBS_FILE_INFO, S_IRUGO, *dir);
 489                 if (entry) {
 490                         entry->proc_fops = info_fops;
 491                         entry->data = data;
 492                         entry->owner = THIS_MODULE;
 493                 }
 494         }
 495
 496         /* 'state' [R] */
 497         if (state_fops) {
 498                 entry = create_proc_entry(ACPI_SBS_FILE_STATE, S_IRUGO, *dir);
 499                 if (entry) {
 500                         entry->proc_fops = state_fops;
 501                         entry->data = data;
 502                         entry->owner = THIS_MODULE;
 503                 }
 504         }
 505
 506         /* 'alarm' [R/W] */
 507         if (alarm_fops) {
 508                 entry = create_proc_entry(ACPI_SBS_FILE_ALARM, S_IRUGO, *dir);
 509                 if (entry) {
 510                         entry->proc_fops = alarm_fops;
 511                         entry->data = data;
 512                         entry->owner = THIS_MODULE;
 513                 }
 514         }
 515         return 0;
 516 }
 517
 518 static void
 519 acpi_sbs_remove_fs(struct proc_dir_entry **dir,
 520                            struct proc_dir_entry *parent_dir)
 521 {
 522         if (*dir) {
 523                 remove_proc_entry(ACPI_SBS_FILE_INFO, *dir);
 524                 remove_proc_entry(ACPI_SBS_FILE_STATE, *dir);
 525                 remove_proc_entry(ACPI_SBS_FILE_ALARM, *dir);
 526                 remove_proc_entry((*dir)->name, parent_dir);
 527                 *dir = NULL;
 528         }
 529 }
 530
 531 /* Smart Battery Interface */
 532 static struct proc_dir_entry *acpi_battery_dir = NULL;
 533
 534 static inline char *acpi_battery_units(struct acpi_battery *battery)
 535 {
 536         return acpi_battery_mode(battery) ? " mW" : " mA";
 537 }
 538
 539
 540 static int acpi_battery_read_info(struct seq_file *seq, void *offset)
 541 {
 542         struct acpi_battery *battery = seq->private;
 543         struct acpi_sbs *sbs = battery->sbs;
 544         int result = 0;
 545
 546         mutex_lock(&sbs->lock);
 547
 548         seq_printf(seq, "present:                 %s\n",
 549                    (battery->present) ? "yes" : "no");
 550         if (!battery->present)
 551                 goto end;
 552
 553         seq_printf(seq, "design capacity:         %i%sh\n",
 554                    battery->design_capacity * acpi_battery_scale(battery),
 555                    acpi_battery_units(battery));
 556         seq_printf(seq, "last full capacity:      %i%sh\n",
 557                    battery->full_charge_capacity * acpi_battery_scale(battery),
 558                    acpi_battery_units(battery));
 559         seq_printf(seq, "battery technology:      rechargeable\n");
 560         seq_printf(seq, "design voltage:          %i mV\n",
 561                    battery->design_voltage * acpi_battery_vscale(battery));
 562         seq_printf(seq, "design capacity warning: unknown\n");
 563         seq_printf(seq, "design capacity low:     unknown\n");
 564         seq_printf(seq, "capacity granularity 1:  unknown\n");
 565         seq_printf(seq, "capacity granularity 2:  unknown\n");
 566         seq_printf(seq, "model number:            %s\n", battery->device_name);
 567         seq_printf(seq, "serial number:           %i\n",
 568                    battery->serial_number);
 569         seq_printf(seq, "battery type:            %s\n",
 570                    battery->device_chemistry);
 571         seq_printf(seq, "OEM info:                %s\n",
 572                    battery->manufacturer_name);
 573       end:
 574         mutex_unlock(&sbs->lock);
 575         return result;
 576 }
 577
 578 static int acpi_battery_info_open_fs(struct inode *inode, struct file *file)
 579 {
 580         return single_open(file, acpi_battery_read_info, PDE(inode)->data);
 581 }
 582
 583 static int acpi_battery_read_state(struct seq_file *seq, void *offset)
 584 {
 585         struct acpi_battery *battery = seq->private;
 586         struct acpi_sbs *sbs = battery->sbs;
 587         int rate;
 588
 589         mutex_lock(&sbs->lock);
 590         seq_printf(seq, "present:                 %s\n",
 591                    (battery->present) ? "yes" : "no");
 592         if (!battery->present)
 593                 goto end;
 594
 595         acpi_battery_get_state(battery);
 596         seq_printf(seq, "capacity state:          %s\n",
 597                    (battery->state & 0x0010) ? "critical" : "ok");
 598         seq_printf(seq, "charging state:          %s\n",
 599                    (battery->current_now < 0) ? "discharging" :
 600                    ((battery->current_now > 0) ? "charging" : "charged"));
 601         rate = abs(battery->current_now) * acpi_battery_ipscale(battery);
 602         rate *= (acpi_battery_mode(battery))?(battery->voltage_now *
 603                         acpi_battery_vscale(battery)/1000):1;
 604         seq_printf(seq, "present rate:            %d%s\n", rate,
 605                    acpi_battery_units(battery));
 606         seq_printf(seq, "remaining capacity:      %i%sh\n",
 607                    battery->capacity_now * acpi_battery_scale(battery),
 608                    acpi_battery_units(battery));
 609         seq_printf(seq, "present voltage:         %i mV\n",
 610                    battery->voltage_now * acpi_battery_vscale(battery));
 611
 612       end:
 613         mutex_unlock(&sbs->lock);
 614         return 0;
 615 }
 616
 617 static int acpi_battery_state_open_fs(struct inode *inode, struct file *file)
 618 {
 619         return single_open(file, acpi_battery_read_state, PDE(inode)->data);
 620 }
 621
 622 static int acpi_battery_read_alarm(struct seq_file *seq, void *offset)
 623 {
 624         struct acpi_battery *battery = seq->private;
 625         struct acpi_sbs *sbs = battery->sbs;
 626         int result = 0;
 627
 628         mutex_lock(&sbs->lock);
 629
 630         if (!battery->present) {
 631                 seq_printf(seq, "present:                 no\n");
 632                 goto end;
 633         }
 634
 635         acpi_battery_get_alarm(battery);
 636         seq_printf(seq, "alarm:                   ");
 637         if (battery->alarm_capacity)
 638                 seq_printf(seq, "%i%sh\n",
 639                            battery->alarm_capacity *
 640                            acpi_battery_scale(battery),
 641                            acpi_battery_units(battery));
 642         else
 643                 seq_printf(seq, "disabled\n");
 644       end:
 645         mutex_unlock(&sbs->lock);
 646         return result;
 647 }
 648
 649 static ssize_t
 650 acpi_battery_write_alarm(struct file *file, const char __user * buffer,
 651                          size_t count, loff_t * ppos)
 652 {
 653         struct seq_file *seq = file->private_data;
 654         struct acpi_battery *battery = seq->private;
 655         struct acpi_sbs *sbs = battery->sbs;
 656         char alarm_string[12] = { '\0' };
 657         int result = 0;
 658         mutex_lock(&sbs->lock);
 659         if (!battery->present) {
 660                 result = -ENODEV;
 661                 goto end;
 662         }
 663         if (count > sizeof(alarm_string) - 1) {
 664                 result = -EINVAL;
 665                 goto end;
 666         }
 667         if (copy_from_user(alarm_string, buffer, count)) {
 668                 result = -EFAULT;
 669                 goto end;
 670         }
 671         alarm_string[count] = 0;
 672         battery->alarm_capacity = simple_strtoul(alarm_string, NULL, 0) /
 673                                         acpi_battery_scale(battery);
 674         acpi_battery_set_alarm(battery);
 675       end:
 676         mutex_unlock(&sbs->lock);
 677         if (result)
 678                 return result;
 679         return count;
 680 }
 681
 682 static int acpi_battery_alarm_open_fs(struct inode *inode, struct file *file)
 683 {
 684         return single_open(file, acpi_battery_read_alarm, PDE(inode)->data);
 685 }
 686
 687 static struct file_operations acpi_battery_info_fops = {
 688         .open = acpi_battery_info_open_fs,
 689         .read = seq_read,
 690         .llseek = seq_lseek,
 691         .release = single_release,
 692         .owner = THIS_MODULE,
 693 };
 694
 695 static struct file_operations acpi_battery_state_fops = {
 696         .open = acpi_battery_state_open_fs,
 697         .read = seq_read,
 698         .llseek = seq_lseek,
 699         .release = single_release,
 700         .owner = THIS_MODULE,
 701 };
 702
 703 static struct file_operations acpi_battery_alarm_fops = {
 704         .open = acpi_battery_alarm_open_fs,
 705         .read = seq_read,
 706         .write = acpi_battery_write_alarm,
 707         .llseek = seq_lseek,
 708         .release = single_release,
 709         .owner = THIS_MODULE,
 710 };
 711
 712 /* Legacy AC Adapter Interface */
 713
 714 static struct proc_dir_entry *acpi_ac_dir = NULL;
 715
 716 static int acpi_ac_read_state(struct seq_file *seq, void *offset)
 717 {
 718
 719         struct acpi_sbs *sbs = seq->private;
 720
 721         mutex_lock(&sbs->lock);
 722
 723         seq_printf(seq, "state:                   %s\n",
 724                    sbs->charger_present ? "on-line" : "off-line");
 725
 726         mutex_unlock(&sbs->lock);
 727         return 0;
 728 }
 729
 730 static int acpi_ac_state_open_fs(struct inode *inode, struct file *file)
 731 {
 732         return single_open(file, acpi_ac_read_state, PDE(inode)->data);
 733 }
 734
 735 static struct file_operations acpi_ac_state_fops = {
 736         .open = acpi_ac_state_open_fs,
 737         .read = seq_read,
 738         .llseek = seq_lseek,
 739         .release = single_release,
 740         .owner = THIS_MODULE,
 741 };
 742
 743 #endif
 744
 745 /* --------------------------------------------------------------------------
 746                                  Driver Interface
 747    -------------------------------------------------------------------------- */
 748 static int acpi_battery_read(struct acpi_battery *battery)
 749 {
 750         int result = 0, saved_present = battery->present;
 751         u16 state;
 752
 753         if (battery->sbs->manager_present) {
 754                 result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
 755                                 ACPI_SBS_MANAGER, 0x01, (u8 *)&state);
 756                 if (!result)
 757                         battery->present = state & (1 << battery->id);
 758                 state &= 0x0fff;
 759                 state |= 1 << (battery->id + 12);
 760                 acpi_smbus_write(battery->sbs->hc, SMBUS_WRITE_WORD,
 761                                   ACPI_SBS_MANAGER, 0x01, (u8 *)&state, 2);
 762         } else if (battery->id == 0)
 763                 battery->present = 1;
 764         if (result || !battery->present)
 765                 return result;
 766
 767         if (saved_present != battery->present) {
 768                 battery->update_time = 0;
 769                 result = acpi_battery_get_info(battery);
 770                 if (result)
 771                         return result;
 772         }
 773         result = acpi_battery_get_state(battery);
 774         return result;
 775 }
 776
 777 /* Smart Battery */
 778 static int acpi_battery_add(struct acpi_sbs *sbs, int id)
 779 {
 780         struct acpi_battery *battery = &sbs->battery[id];
 781         int result;
 782
 783         battery->id = id;
 784         battery->sbs = sbs;
 785         result = acpi_battery_read(battery);
 786         if (result)
 787                 return result;
 788
 789         sprintf(battery->name, ACPI_BATTERY_DIR_NAME, id);
 790 #ifdef CONFIG_ACPI_PROCFS_POWER
 791         acpi_sbs_add_fs(&battery->proc_entry, acpi_battery_dir,
 792                         battery->name, &acpi_battery_info_fops,
 793                         &acpi_battery_state_fops, &acpi_battery_alarm_fops,
 794                         battery);
 795 #endif
 796         battery->bat.name = battery->name;
 797         battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
 798         if (!acpi_battery_mode(battery)) {
 799                 battery->bat.properties = sbs_charge_battery_props;
 800                 battery->bat.num_properties =
 801                     ARRAY_SIZE(sbs_charge_battery_props);
 802         } else {
 803                 battery->bat.properties = sbs_energy_battery_props;
 804                 battery->bat.num_properties =
 805                     ARRAY_SIZE(sbs_energy_battery_props);
 806         }
 807         battery->bat.get_property = acpi_sbs_battery_get_property;
 808         result = power_supply_register(&sbs->device->dev, &battery->bat);
 809         if (result)
 810                 goto end;
 811         result = device_create_file(battery->bat.dev, &alarm_attr);
 812         if (result)
 813                 goto end;
 814         battery->have_sysfs_alarm = 1;
 815       end:
 816         printk(KERN_INFO PREFIX "%s [%s]: Battery Slot [%s] (battery %s)\n",
 817                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
 818                battery->name, sbs->battery->present ? "present" : "absent");
 819         return result;
 820 }
 821
 822 static void acpi_battery_remove(struct acpi_sbs *sbs, int id)
 823 {
 824         struct acpi_battery *battery = &sbs->battery[id];
 825
 826         if (battery->bat.dev) {
 827                 if (battery->have_sysfs_alarm)
 828                         device_remove_file(battery->bat.dev, &alarm_attr);
 829                 power_supply_unregister(&battery->bat);
 830         }
 831 #ifdef CONFIG_ACPI_PROCFS_POWER
 832         if (battery->proc_entry)
 833                 acpi_sbs_remove_fs(&battery->proc_entry, acpi_battery_dir);
 834 #endif
 835 }
 836
 837 static int acpi_charger_add(struct acpi_sbs *sbs)
 838 {
 839         int result;
 840
 841         result = acpi_ac_get_present(sbs);
 842         if (result)
 843                 goto end;
 844 #ifdef CONFIG_ACPI_PROCFS_POWER
 845         result = acpi_sbs_add_fs(&sbs->charger_entry, acpi_ac_dir,
 846                                  ACPI_AC_DIR_NAME, NULL,
 847                                  &acpi_ac_state_fops, NULL, sbs);
 848         if (result)
 849                 goto end;
 850 #endif
 851         sbs->charger.name = "sbs-charger";
 852         sbs->charger.type = POWER_SUPPLY_TYPE_MAINS;
 853         sbs->charger.properties = sbs_ac_props;
 854         sbs->charger.num_properties = ARRAY_SIZE(sbs_ac_props);
 855         sbs->charger.get_property = sbs_get_ac_property;
 856         power_supply_register(&sbs->device->dev, &sbs->charger);
 857         printk(KERN_INFO PREFIX "%s [%s]: AC Adapter [%s] (%s)\n",
 858                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
 859                ACPI_AC_DIR_NAME, sbs->charger_present ? "on-line" : "off-line");
 860       end:
 861         return result;
 862 }
 863
 864 static void acpi_charger_remove(struct acpi_sbs *sbs)
 865 {
 866         if (sbs->charger.dev)
 867                 power_supply_unregister(&sbs->charger);
 868 #ifdef CONFIG_ACPI_PROCFS_POWER
 869         if (sbs->charger_entry)
 870                 acpi_sbs_remove_fs(&sbs->charger_entry, acpi_ac_dir);
 871 #endif
 872 }
 873
 874 void acpi_sbs_callback(void *context)
 875 {
 876         int id;
 877         struct acpi_sbs *sbs = context;
 878         struct acpi_battery *bat;
 879         u8 saved_charger_state = sbs->charger_present;
 880         u8 saved_battery_state;
 881         acpi_ac_get_present(sbs);
 882         if (sbs->charger_present != saved_charger_state) {
 883 #ifdef CONFIG_ACPI_PROC_EVENT
 884                 acpi_bus_generate_proc_event4(ACPI_AC_CLASS, ACPI_AC_DIR_NAME,
 885                                               ACPI_SBS_NOTIFY_STATUS,
 886                                               sbs->charger_present);
 887 #endif
 888                 kobject_uevent(&sbs->charger.dev->kobj, KOBJ_CHANGE);
 889         }
 890         if (sbs->manager_present) {
 891                 for (id = 0; id < MAX_SBS_BAT; ++id) {
 892                         if (!(sbs->batteries_supported & (1 << id)))
 893                                 continue;
 894                         bat = &sbs->battery[id];
 895                         saved_battery_state = bat->present;
 896                         acpi_battery_read(bat);
 897                         if (saved_battery_state == bat->present)
 898                                 continue;
 899 #ifdef CONFIG_ACPI_PROC_EVENT
 900                         acpi_bus_generate_proc_event4(ACPI_BATTERY_CLASS,
 901                                                       bat->name,
 902                                                       ACPI_SBS_NOTIFY_STATUS,
 903                                                       bat->present);
 904 #endif
 905                         kobject_uevent(&bat->bat.dev->kobj, KOBJ_CHANGE);
 906                 }
 907         }
 908 }
 909
 910 static int acpi_sbs_remove(struct acpi_device *device, int type);
 911
 912 static int acpi_sbs_add(struct acpi_device *device)
 913 {
 914         struct acpi_sbs *sbs;
 915         int result = 0;
 916         int id;
 917
 918         sbs = kzalloc(sizeof(struct acpi_sbs), GFP_KERNEL);
 919         if (!sbs) {
 920                 result = -ENOMEM;
 921                 goto end;
 922         }
 923
 924         mutex_init(&sbs->lock);
 925
 926         sbs->hc = acpi_driver_data(device->parent);
 927         sbs->device = device;
 928         strcpy(acpi_device_name(device), ACPI_SBS_DEVICE_NAME);
 929         strcpy(acpi_device_class(device), ACPI_SBS_CLASS);
 930         acpi_driver_data(device) = sbs;
 931
 932         result = acpi_charger_add(sbs);
 933         if (result)
 934                 goto end;
 935
 936         result = acpi_manager_get_info(sbs);
 937         if (!result) {
 938                 sbs->manager_present = 1;
 939                 for (id = 0; id < MAX_SBS_BAT; ++id)
 940                         if ((sbs->batteries_supported & (1 << id)))
 941                                 acpi_battery_add(sbs, id);
 942         } else
 943                 acpi_battery_add(sbs, 0);
 944         acpi_smbus_register_callback(sbs->hc, acpi_sbs_callback, sbs);
 945       end:
 946         if (result)
 947                 acpi_sbs_remove(device, 0);
 948         return result;
 949 }
 950
 951 static int acpi_sbs_remove(struct acpi_device *device, int type)
 952 {
 953         struct acpi_sbs *sbs;
 954         int id;
 955
 956         if (!device)
 957                 return -EINVAL;
 958         sbs = acpi_driver_data(device);
 959         if (!sbs)
 960                 return -EINVAL;
 961         mutex_lock(&sbs->lock);
 962         acpi_smbus_unregister_callback(sbs->hc);
 963         for (id = 0; id < MAX_SBS_BAT; ++id)
 964                 acpi_battery_remove(sbs, id);
 965         acpi_charger_remove(sbs);
 966         mutex_unlock(&sbs->lock);
 967         mutex_destroy(&sbs->lock);
 968         kfree(sbs);
 969         return 0;
 970 }
 971
 972 static void acpi_sbs_rmdirs(void)
 973 {
 974 #ifdef CONFIG_ACPI_PROCFS_POWER
 975         if (acpi_ac_dir) {
 976                 acpi_unlock_ac_dir(acpi_ac_dir);
 977                 acpi_ac_dir = NULL;
 978         }
 979         if (acpi_battery_dir) {
 980                 acpi_unlock_battery_dir(acpi_battery_dir);
 981                 acpi_battery_dir = NULL;
 982         }
 983 #endif
 984 }
 985
 986 static int acpi_sbs_resume(struct acpi_device *device)
 987 {
 988         struct acpi_sbs *sbs;
 989         if (!device)
 990                 return -EINVAL;
 991         sbs = device->driver_data;
 992         acpi_sbs_callback(sbs);
 993         return 0;
 994 }
 995
 996 static struct acpi_driver acpi_sbs_driver = {
 997         .name = "sbs",
 998         .class = ACPI_SBS_CLASS,
 999         .ids = sbs_device_ids,
1000         .ops = {
1001                 .add = acpi_sbs_add,
1002                 .remove = acpi_sbs_remove,
1003                 .resume = acpi_sbs_resume,
1004                 },
1005 };
1006
1007 static int __init acpi_sbs_init(void)
1008 {
1009         int result = 0;
1010
1011         if (acpi_disabled)
1012                 return -ENODEV;
1013 #ifdef CONFIG_ACPI_PROCFS_POWER
1014         acpi_ac_dir = acpi_lock_ac_dir();
1015         if (!acpi_ac_dir)
1016                 return -ENODEV;
1017         acpi_battery_dir = acpi_lock_battery_dir();
1018         if (!acpi_battery_dir) {
1019                 acpi_sbs_rmdirs();
1020                 return -ENODEV;
1021         }
1022 #endif
1023         result = acpi_bus_register_driver(&acpi_sbs_driver);
1024         if (result < 0) {
1025                 acpi_sbs_rmdirs();
1026                 return -ENODEV;
1027         }
1028         return 0;
1029 }
1030
1031 static void __exit acpi_sbs_exit(void)
1032 {
1033         acpi_bus_unregister_driver(&acpi_sbs_driver);
1034         acpi_sbs_rmdirs();
1035         return;
1036 }
1037
1038 module_init(acpi_sbs_init);
1039 module_exit(acpi_sbs_exit);