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, int type);
 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                 break;
 234         case POWER_SUPPLY_PROP_CURRENT_AVG:
 235         case POWER_SUPPLY_PROP_POWER_AVG:
 236                 val->intval = abs(battery->rate_avg) *
 237                                 acpi_battery_ipscale(battery) * 1000;
 238                 break;
 239         case POWER_SUPPLY_PROP_CAPACITY:
 240                 val->intval = battery->state_of_charge;
 241                 break;
 242         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 243         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 244                 val->intval = battery->design_capacity *
 245                         acpi_battery_scale(battery) * 1000;
 246                 break;
 247         case POWER_SUPPLY_PROP_CHARGE_FULL:
 248         case POWER_SUPPLY_PROP_ENERGY_FULL:
 249                 val->intval = battery->full_charge_capacity *
 250                         acpi_battery_scale(battery) * 1000;
 251                 break;
 252         case POWER_SUPPLY_PROP_CHARGE_NOW:
 253         case POWER_SUPPLY_PROP_ENERGY_NOW:
 254                 val->intval = battery->capacity_now *
 255                                 acpi_battery_scale(battery) * 1000;
 256                 break;
 257         case POWER_SUPPLY_PROP_TEMP:
 258                 val->intval = battery->temp_now - 2730; // dK -> dC
 259                 break;
 260         case POWER_SUPPLY_PROP_MODEL_NAME:
 261                 val->strval = battery->device_name;
 262                 break;
 263         case POWER_SUPPLY_PROP_MANUFACTURER:
 264                 val->strval = battery->manufacturer_name;
 265                 break;
 266         default:
 267                 return -EINVAL;
 268         }
 269         return 0;
 270 }
 271
 272 static enum power_supply_property sbs_ac_props[] = {
 273         POWER_SUPPLY_PROP_ONLINE,
 274 };
 275
 276 static enum power_supply_property sbs_charge_battery_props[] = {
 277         POWER_SUPPLY_PROP_STATUS,
 278         POWER_SUPPLY_PROP_PRESENT,
 279         POWER_SUPPLY_PROP_TECHNOLOGY,
 280         POWER_SUPPLY_PROP_CYCLE_COUNT,
 281         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 282         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 283         POWER_SUPPLY_PROP_CURRENT_NOW,
 284         POWER_SUPPLY_PROP_CURRENT_AVG,
 285         POWER_SUPPLY_PROP_CAPACITY,
 286         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 287         POWER_SUPPLY_PROP_CHARGE_FULL,
 288         POWER_SUPPLY_PROP_CHARGE_NOW,
 289         POWER_SUPPLY_PROP_TEMP,
 290         POWER_SUPPLY_PROP_MODEL_NAME,
 291         POWER_SUPPLY_PROP_MANUFACTURER,
 292 };
 293
 294 static enum power_supply_property sbs_energy_battery_props[] = {
 295         POWER_SUPPLY_PROP_STATUS,
 296         POWER_SUPPLY_PROP_PRESENT,
 297         POWER_SUPPLY_PROP_TECHNOLOGY,
 298         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 299         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 300         POWER_SUPPLY_PROP_CURRENT_NOW,
 301         POWER_SUPPLY_PROP_CURRENT_AVG,
 302         POWER_SUPPLY_PROP_POWER_NOW,
 303         POWER_SUPPLY_PROP_POWER_AVG,
 304         POWER_SUPPLY_PROP_CAPACITY,
 305         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 306         POWER_SUPPLY_PROP_ENERGY_FULL,
 307         POWER_SUPPLY_PROP_ENERGY_NOW,
 308         POWER_SUPPLY_PROP_TEMP,
 309         POWER_SUPPLY_PROP_MODEL_NAME,
 310         POWER_SUPPLY_PROP_MANUFACTURER,
 311 };
 312
 313
 314 /* --------------------------------------------------------------------------
 315                             Smart Battery System Management
 316    -------------------------------------------------------------------------- */
 317
 318 struct acpi_battery_reader {
 319         u8 command;             /* command for battery */
 320         u8 mode;                /* word or block? */
 321         size_t offset;          /* offset inside struct acpi_sbs_battery */
 322 };
 323
 324 static struct acpi_battery_reader info_readers[] = {
 325         {0x01, SMBUS_READ_WORD, offsetof(struct acpi_battery, alarm_capacity)},
 326         {0x03, SMBUS_READ_WORD, offsetof(struct acpi_battery, mode)},
 327         {0x10, SMBUS_READ_WORD, offsetof(struct acpi_battery, full_charge_capacity)},
 328         {0x17, SMBUS_READ_WORD, offsetof(struct acpi_battery, cycle_count)},
 329         {0x18, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_capacity)},
 330         {0x19, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_voltage)},
 331         {0x1a, SMBUS_READ_WORD, offsetof(struct acpi_battery, spec)},
 332         {0x1c, SMBUS_READ_WORD, offsetof(struct acpi_battery, serial_number)},
 333         {0x20, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, manufacturer_name)},
 334         {0x21, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_name)},
 335         {0x22, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_chemistry)},
 336 };
 337
 338 static struct acpi_battery_reader state_readers[] = {
 339         {0x08, SMBUS_READ_WORD, offsetof(struct acpi_battery, temp_now)},
 340         {0x09, SMBUS_READ_WORD, offsetof(struct acpi_battery, voltage_now)},
 341         {0x0a, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_now)},
 342         {0x0b, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_avg)},
 343         {0x0f, SMBUS_READ_WORD, offsetof(struct acpi_battery, capacity_now)},
 344         {0x0e, SMBUS_READ_WORD, offsetof(struct acpi_battery, state_of_charge)},
 345         {0x16, SMBUS_READ_WORD, offsetof(struct acpi_battery, state)},
 346 };
 347
 348 static int acpi_manager_get_info(struct acpi_sbs *sbs)
 349 {
 350         int result = 0;
 351         u16 battery_system_info;
 352
 353         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
 354                                  0x04, (u8 *)&battery_system_info);
 355         if (!result)
 356                 sbs->batteries_supported = battery_system_info & 0x000f;
 357         return result;
 358 }
 359
 360 static int acpi_battery_get_info(struct acpi_battery *battery)
 361 {
 362         int i, result = 0;
 363
 364         for (i = 0; i < ARRAY_SIZE(info_readers); ++i) {
 365                 result = acpi_smbus_read(battery->sbs->hc,
 366                                          info_readers[i].mode,
 367                                          ACPI_SBS_BATTERY,
 368                                          info_readers[i].command,
 369                                          (u8 *) battery +
 370                                                 info_readers[i].offset);
 371                 if (result)
 372                         break;
 373         }
 374         return result;
 375 }
 376
 377 static int acpi_battery_get_state(struct acpi_battery *battery)
 378 {
 379         int i, result = 0;
 380
 381         if (battery->update_time &&
 382             time_before(jiffies, battery->update_time +
 383                                 msecs_to_jiffies(cache_time)))
 384                 return 0;
 385         for (i = 0; i < ARRAY_SIZE(state_readers); ++i) {
 386                 result = acpi_smbus_read(battery->sbs->hc,
 387                                          state_readers[i].mode,
 388                                          ACPI_SBS_BATTERY,
 389                                          state_readers[i].command,
 390                                          (u8 *)battery +
 391                                                 state_readers[i].offset);
 392                 if (result)
 393                         goto end;
 394         }
 395       end:
 396         battery->update_time = jiffies;
 397         return result;
 398 }
 399
 400 static int acpi_battery_get_alarm(struct acpi_battery *battery)
 401 {
 402         return acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
 403                                  ACPI_SBS_BATTERY, 0x01,
 404                                  (u8 *)&battery->alarm_capacity);
 405 }
 406
 407 static int acpi_battery_set_alarm(struct acpi_battery *battery)
 408 {
 409         struct acpi_sbs *sbs = battery->sbs;
 410         u16 value, sel = 1 << (battery->id + 12);
 411
 412         int ret;
 413
 414
 415         if (sbs->manager_present) {
 416                 ret = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
 417                                 0x01, (u8 *)&value);
 418                 if (ret)
 419                         goto end;
 420                 if ((value & 0xf000) != sel) {
 421                         value &= 0x0fff;
 422                         value |= sel;
 423                 ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD,
 424                                          ACPI_SBS_MANAGER,
 425                                          0x01, (u8 *)&value, 2);
 426                 if (ret)
 427                         goto end;
 428                 }
 429         }
 430         ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD, ACPI_SBS_BATTERY,
 431                                 0x01, (u8 *)&battery->alarm_capacity, 2);
 432       end:
 433         return ret;
 434 }
 435
 436 static int acpi_ac_get_present(struct acpi_sbs *sbs)
 437 {
 438         int result;
 439         u16 status;
 440
 441         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_CHARGER,
 442                                  0x13, (u8 *) & status);
 443         if (!result)
 444                 sbs->charger_present = (status >> 15) & 0x1;
 445         return result;
 446 }
 447
 448 static ssize_t acpi_battery_alarm_show(struct device *dev,
 449                                         struct device_attribute *attr,
 450                                         char *buf)
 451 {
 452         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 453         acpi_battery_get_alarm(battery);
 454         return sprintf(buf, "%d\n", battery->alarm_capacity *
 455                                 acpi_battery_scale(battery) * 1000);
 456 }
 457
 458 static ssize_t acpi_battery_alarm_store(struct device *dev,
 459                                         struct device_attribute *attr,
 460                                         const char *buf, size_t count)
 461 {
 462         unsigned long x;
 463         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 464         if (sscanf(buf, "%ld\n", &x) == 1)
 465                 battery->alarm_capacity = x /
 466                         (1000 * acpi_battery_scale(battery));
 467         if (battery->present)
 468                 acpi_battery_set_alarm(battery);
 469         return count;
 470 }
 471
 472 static struct device_attribute alarm_attr = {
 473         .attr = {.name = "alarm", .mode = 0644},
 474         .show = acpi_battery_alarm_show,
 475         .store = acpi_battery_alarm_store,
 476 };
 477
 478 /* --------------------------------------------------------------------------
 479                               FS Interface (/proc/acpi)
 480    -------------------------------------------------------------------------- */
 481
 482 #ifdef CONFIG_ACPI_PROCFS_POWER
 483 /* Generic Routines */
 484 static int
 485 acpi_sbs_add_fs(struct proc_dir_entry **dir,
 486                 struct proc_dir_entry *parent_dir,
 487                 char *dir_name,
 488                 const struct file_operations *info_fops,
 489                 const struct file_operations *state_fops,
 490                 const struct file_operations *alarm_fops, void *data)
 491 {
 492         printk(KERN_WARNING PREFIX "Deprecated procfs I/F for SBS is loaded,"
 493                         " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
 494         if (!*dir) {
 495                 *dir = proc_mkdir(dir_name, parent_dir);
 496                 if (!*dir) {
 497                         return -ENODEV;
 498                 }
 499         }
 500
 501         /* 'info' [R] */
 502         if (info_fops)
 503                 proc_create_data(ACPI_SBS_FILE_INFO, S_IRUGO, *dir,
 504                                  info_fops, data);
 505
 506         /* 'state' [R] */
 507         if (state_fops)
 508                 proc_create_data(ACPI_SBS_FILE_STATE, S_IRUGO, *dir,
 509                                  state_fops, data);
 510
 511         /* 'alarm' [R/W] */
 512         if (alarm_fops)
 513                 proc_create_data(ACPI_SBS_FILE_ALARM, S_IRUGO, *dir,
 514                                  alarm_fops, data);
 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, "cycle count:             %i\n", battery->cycle_count);
 565         seq_printf(seq, "capacity granularity 1:  unknown\n");
 566         seq_printf(seq, "capacity granularity 2:  unknown\n");
 567         seq_printf(seq, "model number:            %s\n", battery->device_name);
 568         seq_printf(seq, "serial number:           %i\n",
 569                    battery->serial_number);
 570         seq_printf(seq, "battery type:            %s\n",
 571                    battery->device_chemistry);
 572         seq_printf(seq, "OEM info:                %s\n",
 573                    battery->manufacturer_name);
 574       end:
 575         mutex_unlock(&sbs->lock);
 576         return result;
 577 }
 578
 579 static int acpi_battery_info_open_fs(struct inode *inode, struct file *file)
 580 {
 581         return single_open(file, acpi_battery_read_info, PDE(inode)->data);
 582 }
 583
 584 static int acpi_battery_read_state(struct seq_file *seq, void *offset)
 585 {
 586         struct acpi_battery *battery = seq->private;
 587         struct acpi_sbs *sbs = battery->sbs;
 588         int rate;
 589
 590         mutex_lock(&sbs->lock);
 591         seq_printf(seq, "present:                 %s\n",
 592                    (battery->present) ? "yes" : "no");
 593         if (!battery->present)
 594                 goto end;
 595
 596         acpi_battery_get_state(battery);
 597         seq_printf(seq, "capacity state:          %s\n",
 598                    (battery->state & 0x0010) ? "critical" : "ok");
 599         seq_printf(seq, "charging state:          %s\n",
 600                    (battery->rate_now < 0) ? "discharging" :
 601                    ((battery->rate_now > 0) ? "charging" : "charged"));
 602         rate = abs(battery->rate_now) * acpi_battery_ipscale(battery);
 603         rate *= (acpi_battery_mode(battery))?(battery->voltage_now *
 604                         acpi_battery_vscale(battery)/1000):1;
 605         seq_printf(seq, "present rate:            %d%s\n", rate,
 606                    acpi_battery_units(battery));
 607         seq_printf(seq, "remaining capacity:      %i%sh\n",
 608                    battery->capacity_now * acpi_battery_scale(battery),
 609                    acpi_battery_units(battery));
 610         seq_printf(seq, "present voltage:         %i mV\n",
 611                    battery->voltage_now * acpi_battery_vscale(battery));
 612
 613       end:
 614         mutex_unlock(&sbs->lock);
 615         return 0;
 616 }
 617
 618 static int acpi_battery_state_open_fs(struct inode *inode, struct file *file)
 619 {
 620         return single_open(file, acpi_battery_read_state, PDE(inode)->data);
 621 }
 622
 623 static int acpi_battery_read_alarm(struct seq_file *seq, void *offset)
 624 {
 625         struct acpi_battery *battery = seq->private;
 626         struct acpi_sbs *sbs = battery->sbs;
 627         int result = 0;
 628
 629         mutex_lock(&sbs->lock);
 630
 631         if (!battery->present) {
 632                 seq_printf(seq, "present:                 no\n");
 633                 goto end;
 634         }
 635
 636         acpi_battery_get_alarm(battery);
 637         seq_printf(seq, "alarm:                   ");
 638         if (battery->alarm_capacity)
 639                 seq_printf(seq, "%i%sh\n",
 640                            battery->alarm_capacity *
 641                            acpi_battery_scale(battery),
 642                            acpi_battery_units(battery));
 643         else
 644                 seq_printf(seq, "disabled\n");
 645       end:
 646         mutex_unlock(&sbs->lock);
 647         return result;
 648 }
 649
 650 static ssize_t
 651 acpi_battery_write_alarm(struct file *file, const char __user * buffer,
 652                          size_t count, loff_t * ppos)
 653 {
 654         struct seq_file *seq = file->private_data;
 655         struct acpi_battery *battery = seq->private;
 656         struct acpi_sbs *sbs = battery->sbs;
 657         char alarm_string[12] = { '\0' };
 658         int result = 0;
 659         mutex_lock(&sbs->lock);
 660         if (!battery->present) {
 661                 result = -ENODEV;
 662                 goto end;
 663         }
 664         if (count > sizeof(alarm_string) - 1) {
 665                 result = -EINVAL;
 666                 goto end;
 667         }
 668         if (copy_from_user(alarm_string, buffer, count)) {
 669                 result = -EFAULT;
 670                 goto end;
 671         }
 672         alarm_string[count] = 0;
 673         battery->alarm_capacity = simple_strtoul(alarm_string, NULL, 0) /
 674                                         acpi_battery_scale(battery);
 675         acpi_battery_set_alarm(battery);
 676       end:
 677         mutex_unlock(&sbs->lock);
 678         if (result)
 679                 return result;
 680         return count;
 681 }
 682
 683 static int acpi_battery_alarm_open_fs(struct inode *inode, struct file *file)
 684 {
 685         return single_open(file, acpi_battery_read_alarm, PDE(inode)->data);
 686 }
 687
 688 static const struct file_operations acpi_battery_info_fops = {
 689         .open = acpi_battery_info_open_fs,
 690         .read = seq_read,
 691         .llseek = seq_lseek,
 692         .release = single_release,
 693         .owner = THIS_MODULE,
 694 };
 695
 696 static const struct file_operations acpi_battery_state_fops = {
 697         .open = acpi_battery_state_open_fs,
 698         .read = seq_read,
 699         .llseek = seq_lseek,
 700         .release = single_release,
 701         .owner = THIS_MODULE,
 702 };
 703
 704 static const struct file_operations acpi_battery_alarm_fops = {
 705         .open = acpi_battery_alarm_open_fs,
 706         .read = seq_read,
 707         .write = acpi_battery_write_alarm,
 708         .llseek = seq_lseek,
 709         .release = single_release,
 710         .owner = THIS_MODULE,
 711 };
 712
 713 /* Legacy AC Adapter Interface */
 714
 715 static struct proc_dir_entry *acpi_ac_dir = NULL;
 716
 717 static int acpi_ac_read_state(struct seq_file *seq, void *offset)
 718 {
 719
 720         struct acpi_sbs *sbs = seq->private;
 721
 722         mutex_lock(&sbs->lock);
 723
 724         seq_printf(seq, "state:                   %s\n",
 725                    sbs->charger_present ? "on-line" : "off-line");
 726
 727         mutex_unlock(&sbs->lock);
 728         return 0;
 729 }
 730
 731 static int acpi_ac_state_open_fs(struct inode *inode, struct file *file)
 732 {
 733         return single_open(file, acpi_ac_read_state, PDE(inode)->data);
 734 }
 735
 736 static const struct file_operations acpi_ac_state_fops = {
 737         .open = acpi_ac_state_open_fs,
 738         .read = seq_read,
 739         .llseek = seq_lseek,
 740         .release = single_release,
 741         .owner = THIS_MODULE,
 742 };
 743
 744 #endif
 745
 746 /* --------------------------------------------------------------------------
 747                                  Driver Interface
 748    -------------------------------------------------------------------------- */
 749 static int acpi_battery_read(struct acpi_battery *battery)
 750 {
 751         int result = 0, saved_present = battery->present;
 752         u16 state;
 753
 754         if (battery->sbs->manager_present) {
 755                 result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
 756                                 ACPI_SBS_MANAGER, 0x01, (u8 *)&state);
 757                 if (!result)
 758                         battery->present = state & (1 << battery->id);
 759                 state &= 0x0fff;
 760                 state |= 1 << (battery->id + 12);
 761                 acpi_smbus_write(battery->sbs->hc, SMBUS_WRITE_WORD,
 762                                   ACPI_SBS_MANAGER, 0x01, (u8 *)&state, 2);
 763         } else if (battery->id == 0)
 764                 battery->present = 1;
 765         if (result || !battery->present)
 766                 return result;
 767
 768         if (saved_present != battery->present) {
 769                 battery->update_time = 0;
 770                 result = acpi_battery_get_info(battery);
 771                 if (result)
 772                         return result;
 773         }
 774         result = acpi_battery_get_state(battery);
 775         return result;
 776 }
 777
 778 /* Smart Battery */
 779 static int acpi_battery_add(struct acpi_sbs *sbs, int id)
 780 {
 781         struct acpi_battery *battery = &sbs->battery[id];
 782         int result;
 783
 784         battery->id = id;
 785         battery->sbs = sbs;
 786         result = acpi_battery_read(battery);
 787         if (result)
 788                 return result;
 789
 790         sprintf(battery->name, ACPI_BATTERY_DIR_NAME, id);
 791 #ifdef CONFIG_ACPI_PROCFS_POWER
 792         acpi_sbs_add_fs(&battery->proc_entry, acpi_battery_dir,
 793                         battery->name, &acpi_battery_info_fops,
 794                         &acpi_battery_state_fops, &acpi_battery_alarm_fops,
 795                         battery);
 796 #endif
 797         battery->bat.name = battery->name;
 798         battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
 799         if (!acpi_battery_mode(battery)) {
 800                 battery->bat.properties = sbs_charge_battery_props;
 801                 battery->bat.num_properties =
 802                     ARRAY_SIZE(sbs_charge_battery_props);
 803         } else {
 804                 battery->bat.properties = sbs_energy_battery_props;
 805                 battery->bat.num_properties =
 806                     ARRAY_SIZE(sbs_energy_battery_props);
 807         }
 808         battery->bat.get_property = acpi_sbs_battery_get_property;
 809         result = power_supply_register(&sbs->device->dev, &battery->bat);
 810         if (result)
 811                 goto end;
 812         result = device_create_file(battery->bat.dev, &alarm_attr);
 813         if (result)
 814                 goto end;
 815         battery->have_sysfs_alarm = 1;
 816       end:
 817         printk(KERN_INFO PREFIX "%s [%s]: Battery Slot [%s] (battery %s)\n",
 818                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
 819                battery->name, battery->present ? "present" : "absent");
 820         return result;
 821 }
 822
 823 static void acpi_battery_remove(struct acpi_sbs *sbs, int id)
 824 {
 825         struct acpi_battery *battery = &sbs->battery[id];
 826
 827         if (battery->bat.dev) {
 828                 if (battery->have_sysfs_alarm)
 829                         device_remove_file(battery->bat.dev, &alarm_attr);
 830                 power_supply_unregister(&battery->bat);
 831         }
 832 #ifdef CONFIG_ACPI_PROCFS_POWER
 833         if (battery->proc_entry)
 834                 acpi_sbs_remove_fs(&battery->proc_entry, acpi_battery_dir);
 835 #endif
 836 }
 837
 838 static int acpi_charger_add(struct acpi_sbs *sbs)
 839 {
 840         int result;
 841
 842         result = acpi_ac_get_present(sbs);
 843         if (result)
 844                 goto end;
 845 #ifdef CONFIG_ACPI_PROCFS_POWER
 846         result = acpi_sbs_add_fs(&sbs->charger_entry, acpi_ac_dir,
 847                                  ACPI_AC_DIR_NAME, NULL,
 848                                  &acpi_ac_state_fops, NULL, sbs);
 849         if (result)
 850                 goto end;
 851 #endif
 852         sbs->charger.name = "sbs-charger";
 853         sbs->charger.type = POWER_SUPPLY_TYPE_MAINS;
 854         sbs->charger.properties = sbs_ac_props;
 855         sbs->charger.num_properties = ARRAY_SIZE(sbs_ac_props);
 856         sbs->charger.get_property = sbs_get_ac_property;
 857         power_supply_register(&sbs->device->dev, &sbs->charger);
 858         printk(KERN_INFO PREFIX "%s [%s]: AC Adapter [%s] (%s)\n",
 859                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
 860                ACPI_AC_DIR_NAME, sbs->charger_present ? "on-line" : "off-line");
 861       end:
 862         return result;
 863 }
 864
 865 static void acpi_charger_remove(struct acpi_sbs *sbs)
 866 {
 867         if (sbs->charger.dev)
 868                 power_supply_unregister(&sbs->charger);
 869 #ifdef CONFIG_ACPI_PROCFS_POWER
 870         if (sbs->charger_entry)
 871                 acpi_sbs_remove_fs(&sbs->charger_entry, acpi_ac_dir);
 872 #endif
 873 }
 874
 875 static void acpi_sbs_callback(void *context)
 876 {
 877         int id;
 878         struct acpi_sbs *sbs = context;
 879         struct acpi_battery *bat;
 880         u8 saved_charger_state = sbs->charger_present;
 881         u8 saved_battery_state;
 882         acpi_ac_get_present(sbs);
 883         if (sbs->charger_present != saved_charger_state) {
 884 #ifdef CONFIG_ACPI_PROC_EVENT
 885                 acpi_bus_generate_proc_event4(ACPI_AC_CLASS, ACPI_AC_DIR_NAME,
 886                                               ACPI_SBS_NOTIFY_STATUS,
 887                                               sbs->charger_present);
 888 #endif
 889                 kobject_uevent(&sbs->charger.dev->kobj, KOBJ_CHANGE);
 890         }
 891         if (sbs->manager_present) {
 892                 for (id = 0; id < MAX_SBS_BAT; ++id) {
 893                         if (!(sbs->batteries_supported & (1 << id)))
 894                                 continue;
 895                         bat = &sbs->battery[id];
 896                         saved_battery_state = bat->present;
 897                         acpi_battery_read(bat);
 898                         if (saved_battery_state == bat->present)
 899                                 continue;
 900 #ifdef CONFIG_ACPI_PROC_EVENT
 901                         acpi_bus_generate_proc_event4(ACPI_BATTERY_CLASS,
 902                                                       bat->name,
 903                                                       ACPI_SBS_NOTIFY_STATUS,
 904                                                       bat->present);
 905 #endif
 906                         kobject_uevent(&bat->bat.dev->kobj, KOBJ_CHANGE);
 907                 }
 908         }
 909 }
 910
 911 static int acpi_sbs_add(struct acpi_device *device)
 912 {
 913         struct acpi_sbs *sbs;
 914         int result = 0;
 915         int id;
 916
 917         sbs = kzalloc(sizeof(struct acpi_sbs), GFP_KERNEL);
 918         if (!sbs) {
 919                 result = -ENOMEM;
 920                 goto end;
 921         }
 922
 923         mutex_init(&sbs->lock);
 924
 925         sbs->hc = acpi_driver_data(device->parent);
 926         sbs->device = device;
 927         strcpy(acpi_device_name(device), ACPI_SBS_DEVICE_NAME);
 928         strcpy(acpi_device_class(device), ACPI_SBS_CLASS);
 929         device->driver_data = sbs;
 930
 931         result = acpi_charger_add(sbs);
 932         if (result)
 933                 goto end;
 934
 935         result = acpi_manager_get_info(sbs);
 936         if (!result) {
 937                 sbs->manager_present = 1;
 938                 for (id = 0; id < MAX_SBS_BAT; ++id)
 939                         if ((sbs->batteries_supported & (1 << id)))
 940                                 acpi_battery_add(sbs, id);
 941         } else
 942                 acpi_battery_add(sbs, 0);
 943         acpi_smbus_register_callback(sbs->hc, acpi_sbs_callback, sbs);
 944       end:
 945         if (result)
 946                 acpi_sbs_remove(device, 0);
 947         return result;
 948 }
 949
 950 static int acpi_sbs_remove(struct acpi_device *device, int type)
 951 {
 952         struct acpi_sbs *sbs;
 953         int id;
 954
 955         if (!device)
 956                 return -EINVAL;
 957         sbs = acpi_driver_data(device);
 958         if (!sbs)
 959                 return -EINVAL;
 960         mutex_lock(&sbs->lock);
 961         acpi_smbus_unregister_callback(sbs->hc);
 962         for (id = 0; id < MAX_SBS_BAT; ++id)
 963                 acpi_battery_remove(sbs, id);
 964         acpi_charger_remove(sbs);
 965         mutex_unlock(&sbs->lock);
 966         mutex_destroy(&sbs->lock);
 967         kfree(sbs);
 968         return 0;
 969 }
 970
 971 static void acpi_sbs_rmdirs(void)
 972 {
 973 #ifdef CONFIG_ACPI_PROCFS_POWER
 974         if (acpi_ac_dir) {
 975                 acpi_unlock_ac_dir(acpi_ac_dir);
 976                 acpi_ac_dir = NULL;
 977         }
 978         if (acpi_battery_dir) {
 979                 acpi_unlock_battery_dir(acpi_battery_dir);
 980                 acpi_battery_dir = NULL;
 981         }
 982 #endif
 983 }
 984
 985 static int acpi_sbs_resume(struct acpi_device *device)
 986 {
 987         struct acpi_sbs *sbs;
 988         if (!device)
 989                 return -EINVAL;
 990         sbs = device->driver_data;
 991         acpi_sbs_callback(sbs);
 992         return 0;
 993 }
 994
 995 static struct acpi_driver acpi_sbs_driver = {
 996         .name = "sbs",
 997         .class = ACPI_SBS_CLASS,
 998         .ids = sbs_device_ids,
 999         .ops = {
1000                 .add = acpi_sbs_add,
1001                 .remove = acpi_sbs_remove,
1002                 .resume = acpi_sbs_resume,
1003                 },
1004 };
1005
1006 static int __init acpi_sbs_init(void)
1007 {
1008         int result = 0;
1009
1010         if (acpi_disabled)
1011                 return -ENODEV;
1012 #ifdef CONFIG_ACPI_PROCFS_POWER
1013         acpi_ac_dir = acpi_lock_ac_dir();
1014         if (!acpi_ac_dir)
1015                 return -ENODEV;
1016         acpi_battery_dir = acpi_lock_battery_dir();
1017         if (!acpi_battery_dir) {
1018                 acpi_sbs_rmdirs();
1019                 return -ENODEV;
1020         }
1021 #endif
1022         result = acpi_bus_register_driver(&acpi_sbs_driver);
1023         if (result < 0) {
1024                 acpi_sbs_rmdirs();
1025                 return -ENODEV;
1026         }
1027         return 0;
1028 }
1029
1030 static void __exit acpi_sbs_exit(void)
1031 {
1032         acpi_bus_unregister_driver(&acpi_sbs_driver);
1033         acpi_sbs_rmdirs();
1034         return;
1035 }
1036
1037 module_init(acpi_sbs_init);
1038 module_exit(acpi_sbs_exit);