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 enum acpi_sbs_device_addr {
  58         ACPI_SBS_CHARGER = 0x9,
  59         ACPI_SBS_MANAGER = 0xa,
  60         ACPI_SBS_BATTERY = 0xb,
  61 };
  62
  63 #define ACPI_SBS_NOTIFY_STATUS          0x80
  64 #define ACPI_SBS_NOTIFY_INFO            0x81
  65
  66 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
  67 MODULE_DESCRIPTION("Smart Battery System ACPI interface driver");
  68 MODULE_LICENSE("GPL");
  69
  70 static unsigned int cache_time = 1000;
  71 module_param(cache_time, uint, 0644);
  72 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
  73
  74 extern struct proc_dir_entry *acpi_lock_ac_dir(void);
  75 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
  76 extern void acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
  77 extern void acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
  78
  79 #define MAX_SBS_BAT                     4
  80 #define ACPI_SBS_BLOCK_MAX              32
  81
  82 static const struct acpi_device_id sbs_device_ids[] = {
  83         {"ACPI0002", 0},
  84         {"", 0},
  85 };
  86 MODULE_DEVICE_TABLE(acpi, sbs_device_ids);
  87
  88 struct acpi_battery {
  89         struct power_supply bat;
  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 current_now;
 108         s16 current_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         struct power_supply charger;
 123         struct acpi_device *device;
 124         struct acpi_smb_hc *hc;
 125         struct mutex lock;
 126 #ifdef CONFIG_ACPI_PROCFS_POWER
 127         struct proc_dir_entry *charger_entry;
 128 #endif
 129         struct acpi_battery battery[MAX_SBS_BAT];
 130         u8 batteries_supported:4;
 131         u8 manager_present:1;
 132         u8 charger_present:1;
 133 };
 134
 135 #define to_acpi_sbs(x) container_of(x, struct acpi_sbs, charger)
 136
 137 static inline int battery_scale(int log)
 138 {
 139         int scale = 1;
 140         while (log--)
 141                 scale *= 10;
 142         return scale;
 143 }
 144
 145 static inline int acpi_battery_vscale(struct acpi_battery *battery)
 146 {
 147         return battery_scale((battery->spec & 0x0f00) >> 8);
 148 }
 149
 150 static inline int acpi_battery_ipscale(struct acpi_battery *battery)
 151 {
 152         return battery_scale((battery->spec & 0xf000) >> 12);
 153 }
 154
 155 static inline int acpi_battery_mode(struct acpi_battery *battery)
 156 {
 157         return (battery->mode & 0x8000);
 158 }
 159
 160 static inline int acpi_battery_scale(struct acpi_battery *battery)
 161 {
 162         return (acpi_battery_mode(battery) ? 10 : 1) *
 163             acpi_battery_ipscale(battery);
 164 }
 165
 166 static int sbs_get_ac_property(struct power_supply *psy,
 167                                enum power_supply_property psp,
 168                                union power_supply_propval *val)
 169 {
 170         struct acpi_sbs *sbs = to_acpi_sbs(psy);
 171         switch (psp) {
 172         case POWER_SUPPLY_PROP_ONLINE:
 173                 val->intval = sbs->charger_present;
 174                 break;
 175         default:
 176                 return -EINVAL;
 177         }
 178         return 0;
 179 }
 180
 181 static int acpi_battery_technology(struct acpi_battery *battery)
 182 {
 183         if (!strcasecmp("NiCd", battery->device_chemistry))
 184                 return POWER_SUPPLY_TECHNOLOGY_NiCd;
 185         if (!strcasecmp("NiMH", battery->device_chemistry))
 186                 return POWER_SUPPLY_TECHNOLOGY_NiMH;
 187         if (!strcasecmp("LION", battery->device_chemistry))
 188                 return POWER_SUPPLY_TECHNOLOGY_LION;
 189         if (!strcasecmp("LiP", battery->device_chemistry))
 190                 return POWER_SUPPLY_TECHNOLOGY_LIPO;
 191         return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 192 }
 193
 194 static int acpi_sbs_battery_get_property(struct power_supply *psy,
 195                                          enum power_supply_property psp,
 196                                          union power_supply_propval *val)
 197 {
 198         struct acpi_battery *battery = to_acpi_battery(psy);
 199
 200         if ((!battery->present) && psp != POWER_SUPPLY_PROP_PRESENT)
 201                 return -ENODEV;
 202         switch (psp) {
 203         case POWER_SUPPLY_PROP_STATUS:
 204                 if (battery->current_now < 0)
 205                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 206                 else if (battery->current_now > 0)
 207                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 208                 else
 209                         val->intval = POWER_SUPPLY_STATUS_FULL;
 210                 break;
 211         case POWER_SUPPLY_PROP_PRESENT:
 212                 val->intval = battery->present;
 213                 break;
 214         case POWER_SUPPLY_PROP_TECHNOLOGY:
 215                 val->intval = acpi_battery_technology(battery);
 216                 break;
 217         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 218                 val->intval = battery->design_voltage *
 219                         acpi_battery_vscale(battery) * 1000;
 220                 break;
 221         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 222                 val->intval = battery->voltage_now *
 223                                 acpi_battery_vscale(battery) * 1000;
 224                 break;
 225         case POWER_SUPPLY_PROP_CURRENT_NOW:
 226                 val->intval = abs(battery->current_now) *
 227                                 acpi_battery_ipscale(battery) * 1000;
 228                 break;
 229         case POWER_SUPPLY_PROP_CURRENT_AVG:
 230                 val->intval = abs(battery->current_avg) *
 231                                 acpi_battery_ipscale(battery) * 1000;
 232                 break;
 233         case POWER_SUPPLY_PROP_CAPACITY:
 234                 val->intval = battery->state_of_charge;
 235                 break;
 236         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 237         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 238                 val->intval = battery->design_capacity *
 239                         acpi_battery_scale(battery) * 1000;
 240                 break;
 241         case POWER_SUPPLY_PROP_CHARGE_FULL:
 242         case POWER_SUPPLY_PROP_ENERGY_FULL:
 243                 val->intval = battery->full_charge_capacity *
 244                         acpi_battery_scale(battery) * 1000;
 245                 break;
 246         case POWER_SUPPLY_PROP_CHARGE_NOW:
 247         case POWER_SUPPLY_PROP_ENERGY_NOW:
 248                 val->intval = battery->capacity_now *
 249                                 acpi_battery_scale(battery) * 1000;
 250                 break;
 251         case POWER_SUPPLY_PROP_TEMP:
 252                 val->intval = battery->temp_now - 2730; // dK -> dC
 253                 break;
 254         case POWER_SUPPLY_PROP_MODEL_NAME:
 255                 val->strval = battery->device_name;
 256                 break;
 257         case POWER_SUPPLY_PROP_MANUFACTURER:
 258                 val->strval = battery->manufacturer_name;
 259                 break;
 260         default:
 261                 return -EINVAL;
 262         }
 263         return 0;
 264 }
 265
 266 static enum power_supply_property sbs_ac_props[] = {
 267         POWER_SUPPLY_PROP_ONLINE,
 268 };
 269
 270 static enum power_supply_property sbs_charge_battery_props[] = {
 271         POWER_SUPPLY_PROP_STATUS,
 272         POWER_SUPPLY_PROP_PRESENT,
 273         POWER_SUPPLY_PROP_TECHNOLOGY,
 274         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 275         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 276         POWER_SUPPLY_PROP_CURRENT_NOW,
 277         POWER_SUPPLY_PROP_CURRENT_AVG,
 278         POWER_SUPPLY_PROP_CAPACITY,
 279         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 280         POWER_SUPPLY_PROP_CHARGE_FULL,
 281         POWER_SUPPLY_PROP_CHARGE_NOW,
 282         POWER_SUPPLY_PROP_TEMP,
 283         POWER_SUPPLY_PROP_MODEL_NAME,
 284         POWER_SUPPLY_PROP_MANUFACTURER,
 285 };
 286
 287 static enum power_supply_property sbs_energy_battery_props[] = {
 288         POWER_SUPPLY_PROP_STATUS,
 289         POWER_SUPPLY_PROP_PRESENT,
 290         POWER_SUPPLY_PROP_TECHNOLOGY,
 291         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 292         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 293         POWER_SUPPLY_PROP_CURRENT_NOW,
 294         POWER_SUPPLY_PROP_CURRENT_AVG,
 295         POWER_SUPPLY_PROP_CAPACITY,
 296         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 297         POWER_SUPPLY_PROP_ENERGY_FULL,
 298         POWER_SUPPLY_PROP_ENERGY_NOW,
 299         POWER_SUPPLY_PROP_TEMP,
 300         POWER_SUPPLY_PROP_MODEL_NAME,
 301         POWER_SUPPLY_PROP_MANUFACTURER,
 302 };
 303
 304 /* --------------------------------------------------------------------------
 305                             Smart Battery System Management
 306    -------------------------------------------------------------------------- */
 307
 308 struct acpi_battery_reader {
 309         u8 command;             /* command for battery */
 310         u8 mode;                /* word or block? */
 311         size_t offset;          /* offset inside struct acpi_sbs_battery */
 312 };
 313
 314 static struct acpi_battery_reader info_readers[] = {
 315         {0x01, SMBUS_READ_WORD, offsetof(struct acpi_battery, alarm_capacity)},
 316         {0x03, SMBUS_READ_WORD, offsetof(struct acpi_battery, mode)},
 317         {0x10, SMBUS_READ_WORD, offsetof(struct acpi_battery, full_charge_capacity)},
 318         {0x17, SMBUS_READ_WORD, offsetof(struct acpi_battery, cycle_count)},
 319         {0x18, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_capacity)},
 320         {0x19, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_voltage)},
 321         {0x1a, SMBUS_READ_WORD, offsetof(struct acpi_battery, spec)},
 322         {0x1c, SMBUS_READ_WORD, offsetof(struct acpi_battery, serial_number)},
 323         {0x20, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, manufacturer_name)},
 324         {0x21, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_name)},
 325         {0x22, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_chemistry)},
 326 };
 327
 328 static struct acpi_battery_reader state_readers[] = {
 329         {0x08, SMBUS_READ_WORD, offsetof(struct acpi_battery, temp_now)},
 330         {0x09, SMBUS_READ_WORD, offsetof(struct acpi_battery, voltage_now)},
 331         {0x0a, SMBUS_READ_WORD, offsetof(struct acpi_battery, current_now)},
 332         {0x0b, SMBUS_READ_WORD, offsetof(struct acpi_battery, current_avg)},
 333         {0x0f, SMBUS_READ_WORD, offsetof(struct acpi_battery, capacity_now)},
 334         {0x0e, SMBUS_READ_WORD, offsetof(struct acpi_battery, state_of_charge)},
 335         {0x16, SMBUS_READ_WORD, offsetof(struct acpi_battery, state)},
 336 };
 337
 338 static int acpi_manager_get_info(struct acpi_sbs *sbs)
 339 {
 340         int result = 0;
 341         u16 battery_system_info;
 342
 343         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
 344                                  0x04, (u8 *)&battery_system_info);
 345         if (!result)
 346                 sbs->batteries_supported = battery_system_info & 0x000f;
 347         return result;
 348 }
 349
 350 static int acpi_battery_get_info(struct acpi_battery *battery)
 351 {
 352         int i, result = 0;
 353
 354         for (i = 0; i < ARRAY_SIZE(info_readers); ++i) {
 355                 result = acpi_smbus_read(battery->sbs->hc,
 356                                          info_readers[i].mode,
 357                                          ACPI_SBS_BATTERY,
 358                                          info_readers[i].command,
 359                                          (u8 *) battery +
 360                                                 info_readers[i].offset);
 361                 if (result)
 362                         break;
 363         }
 364         return result;
 365 }
 366
 367 static int acpi_battery_get_state(struct acpi_battery *battery)
 368 {
 369         int i, result = 0;
 370
 371         if (battery->update_time &&
 372             time_before(jiffies, battery->update_time +
 373                                 msecs_to_jiffies(cache_time)))
 374                 return 0;
 375         for (i = 0; i < ARRAY_SIZE(state_readers); ++i) {
 376                 result = acpi_smbus_read(battery->sbs->hc,
 377                                          state_readers[i].mode,
 378                                          ACPI_SBS_BATTERY,
 379                                          state_readers[i].command,
 380                                          (u8 *)battery +
 381                                                 state_readers[i].offset);
 382                 if (result)
 383                         goto end;
 384         }
 385       end:
 386         battery->update_time = jiffies;
 387         return result;
 388 }
 389
 390 static int acpi_battery_get_alarm(struct acpi_battery *battery)
 391 {
 392         return acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
 393                                  ACPI_SBS_BATTERY, 0x01,
 394                                  (u8 *)&battery->alarm_capacity);
 395 }
 396
 397 static int acpi_battery_set_alarm(struct acpi_battery *battery)
 398 {
 399         struct acpi_sbs *sbs = battery->sbs;
 400         u16 value, sel = 1 << (battery->id + 12);
 401
 402         int ret;
 403
 404
 405         if (sbs->manager_present) {
 406                 ret = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
 407                                 0x01, (u8 *)&value);
 408                 if (ret)
 409                         goto end;
 410                 if ((value & 0xf000) != sel) {
 411                         value &= 0x0fff;
 412                         value |= sel;
 413                 ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD,
 414                                          ACPI_SBS_MANAGER,
 415                                          0x01, (u8 *)&value, 2);
 416                 if (ret)
 417                         goto end;
 418                 }
 419         }
 420         ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD, ACPI_SBS_BATTERY,
 421                                 0x01, (u8 *)&battery->alarm_capacity, 2);
 422       end:
 423         return ret;
 424 }
 425
 426 static int acpi_ac_get_present(struct acpi_sbs *sbs)
 427 {
 428         int result;
 429         u16 status;
 430
 431         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_CHARGER,
 432                                  0x13, (u8 *) & status);
 433         if (!result)
 434                 sbs->charger_present = (status >> 15) & 0x1;
 435         return result;
 436 }
 437
 438 static ssize_t acpi_battery_alarm_show(struct device *dev,
 439                                         struct device_attribute *attr,
 440                                         char *buf)
 441 {
 442         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 443         acpi_battery_get_alarm(battery);
 444         return sprintf(buf, "%d\n", battery->alarm_capacity *
 445                                 acpi_battery_scale(battery) * 1000);
 446 }
 447
 448 static ssize_t acpi_battery_alarm_store(struct device *dev,
 449                                         struct device_attribute *attr,
 450                                         const char *buf, size_t count)
 451 {
 452         unsigned long x;
 453         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 454         if (sscanf(buf, "%ld\n", &x) == 1)
 455                 battery->alarm_capacity = x /
 456                         (1000 * acpi_battery_scale(battery));
 457         if (battery->present)
 458                 acpi_battery_set_alarm(battery);
 459         return count;
 460 }
 461
 462 static struct device_attribute alarm_attr = {
 463         .attr = {.name = "alarm", .mode = 0644, .owner = THIS_MODULE},
 464         .show = acpi_battery_alarm_show,
 465         .store = acpi_battery_alarm_store,
 466 };
 467
 468 /* --------------------------------------------------------------------------
 469                               FS Interface (/proc/acpi)
 470    -------------------------------------------------------------------------- */
 471
 472 #ifdef CONFIG_ACPI_PROCFS_POWER
 473 /* Generic Routines */
 474 static int
 475 acpi_sbs_add_fs(struct proc_dir_entry **dir,
 476                 struct proc_dir_entry *parent_dir,
 477                 char *dir_name,
 478                 struct file_operations *info_fops,
 479                 struct file_operations *state_fops,
 480                 struct file_operations *alarm_fops, void *data)
 481 {
 482         struct proc_dir_entry *entry = NULL;
 483
 484         if (!*dir) {
 485                 *dir = proc_mkdir(dir_name, parent_dir);
 486                 if (!*dir) {
 487                         return -ENODEV;
 488                 }
 489                 (*dir)->owner = THIS_MODULE;
 490         }
 491
 492         /* 'info' [R] */
 493         if (info_fops) {
 494                 entry = create_proc_entry(ACPI_SBS_FILE_INFO, S_IRUGO, *dir);
 495                 if (entry) {
 496                         entry->proc_fops = info_fops;
 497                         entry->data = data;
 498                         entry->owner = THIS_MODULE;
 499                 }
 500         }
 501
 502         /* 'state' [R] */
 503         if (state_fops) {
 504                 entry = create_proc_entry(ACPI_SBS_FILE_STATE, S_IRUGO, *dir);
 505                 if (entry) {
 506                         entry->proc_fops = state_fops;
 507                         entry->data = data;
 508                         entry->owner = THIS_MODULE;
 509                 }
 510         }
 511
 512         /* 'alarm' [R/W] */
 513         if (alarm_fops) {
 514                 entry = create_proc_entry(ACPI_SBS_FILE_ALARM, S_IRUGO, *dir);
 515                 if (entry) {
 516                         entry->proc_fops = alarm_fops;
 517                         entry->data = data;
 518                         entry->owner = THIS_MODULE;
 519                 }
 520         }
 521         return 0;
 522 }
 523
 524 static void
 525 acpi_sbs_remove_fs(struct proc_dir_entry **dir,
 526                            struct proc_dir_entry *parent_dir)
 527 {
 528         if (*dir) {
 529                 remove_proc_entry(ACPI_SBS_FILE_INFO, *dir);
 530                 remove_proc_entry(ACPI_SBS_FILE_STATE, *dir);
 531                 remove_proc_entry(ACPI_SBS_FILE_ALARM, *dir);
 532                 remove_proc_entry((*dir)->name, parent_dir);
 533                 *dir = NULL;
 534         }
 535 }
 536
 537 /* Smart Battery Interface */
 538 static struct proc_dir_entry *acpi_battery_dir = NULL;
 539
 540 static inline char *acpi_battery_units(struct acpi_battery *battery)
 541 {
 542         return acpi_battery_mode(battery) ? " mWh" : " mAh";
 543 }
 544
 545
 546 static int acpi_battery_read_info(struct seq_file *seq, void *offset)
 547 {
 548         struct acpi_battery *battery = seq->private;
 549         struct acpi_sbs *sbs = battery->sbs;
 550         int result = 0;
 551
 552         mutex_lock(&sbs->lock);
 553
 554         seq_printf(seq, "present:                 %s\n",
 555                    (battery->present) ? "yes" : "no");
 556         if (!battery->present)
 557                 goto end;
 558
 559         seq_printf(seq, "design capacity:         %i%s\n",
 560                    battery->design_capacity * acpi_battery_scale(battery),
 561                    acpi_battery_units(battery));
 562         seq_printf(seq, "last full capacity:      %i%s\n",
 563                    battery->full_charge_capacity * acpi_battery_scale(battery),
 564                    acpi_battery_units(battery));
 565         seq_printf(seq, "battery technology:      rechargeable\n");
 566         seq_printf(seq, "design voltage:          %i mV\n",
 567                    battery->design_voltage * acpi_battery_vscale(battery));
 568         seq_printf(seq, "design capacity warning: unknown\n");
 569         seq_printf(seq, "design capacity low:     unknown\n");
 570         seq_printf(seq, "capacity granularity 1:  unknown\n");
 571         seq_printf(seq, "capacity granularity 2:  unknown\n");
 572         seq_printf(seq, "model number:            %s\n", battery->device_name);
 573         seq_printf(seq, "serial number:           %i\n",
 574                    battery->serial_number);
 575         seq_printf(seq, "battery type:            %s\n",
 576                    battery->device_chemistry);
 577         seq_printf(seq, "OEM info:                %s\n",
 578                    battery->manufacturer_name);
 579       end:
 580         mutex_unlock(&sbs->lock);
 581         return result;
 582 }
 583
 584 static int acpi_battery_info_open_fs(struct inode *inode, struct file *file)
 585 {
 586         return single_open(file, acpi_battery_read_info, PDE(inode)->data);
 587 }
 588
 589 static int acpi_battery_read_state(struct seq_file *seq, void *offset)
 590 {
 591         struct acpi_battery *battery = seq->private;
 592         struct acpi_sbs *sbs = battery->sbs;
 593         int result = 0;
 594
 595         mutex_lock(&sbs->lock);
 596         seq_printf(seq, "present:                 %s\n",
 597                    (battery->present) ? "yes" : "no");
 598         if (!battery->present)
 599                 goto end;
 600
 601         acpi_battery_get_state(battery);
 602         seq_printf(seq, "capacity state:          %s\n",
 603                    (battery->state & 0x0010) ? "critical" : "ok");
 604         seq_printf(seq, "charging state:          %s\n",
 605                    (battery->current_now < 0) ? "discharging" :
 606                    ((battery->current_now > 0) ? "charging" : "charged"));
 607         seq_printf(seq, "present rate:            %d mA\n",
 608                    abs(battery->current_now) * acpi_battery_ipscale(battery));
 609         seq_printf(seq, "remaining capacity:      %i%s\n",
 610                    battery->capacity_now * acpi_battery_scale(battery),
 611                    acpi_battery_units(battery));
 612         seq_printf(seq, "present voltage:         %i mV\n",
 613                    battery->voltage_now * acpi_battery_vscale(battery));
 614
 615       end:
 616         mutex_unlock(&sbs->lock);
 617         return result;
 618 }
 619
 620 static int acpi_battery_state_open_fs(struct inode *inode, struct file *file)
 621 {
 622         return single_open(file, acpi_battery_read_state, PDE(inode)->data);
 623 }
 624
 625 static int acpi_battery_read_alarm(struct seq_file *seq, void *offset)
 626 {
 627         struct acpi_battery *battery = seq->private;
 628         struct acpi_sbs *sbs = battery->sbs;
 629         int result = 0;
 630
 631         mutex_lock(&sbs->lock);
 632
 633         if (!battery->present) {
 634                 seq_printf(seq, "present:                 no\n");
 635                 goto end;
 636         }
 637
 638         acpi_battery_get_alarm(battery);
 639         seq_printf(seq, "alarm:                   ");
 640         if (battery->alarm_capacity)
 641                 seq_printf(seq, "%i%s\n",
 642                            battery->alarm_capacity *
 643                            acpi_battery_scale(battery),
 644                            acpi_battery_units(battery));
 645         else
 646                 seq_printf(seq, "disabled\n");
 647       end:
 648         mutex_unlock(&sbs->lock);
 649         return result;
 650 }
 651
 652 static ssize_t
 653 acpi_battery_write_alarm(struct file *file, const char __user * buffer,
 654                          size_t count, loff_t * ppos)
 655 {
 656         struct seq_file *seq = file->private_data;
 657         struct acpi_battery *battery = seq->private;
 658         struct acpi_sbs *sbs = battery->sbs;
 659         char alarm_string[12] = { '\0' };
 660         int result = 0;
 661         mutex_lock(&sbs->lock);
 662         if (!battery->present) {
 663                 result = -ENODEV;
 664                 goto end;
 665         }
 666         if (count > sizeof(alarm_string) - 1) {
 667                 result = -EINVAL;
 668                 goto end;
 669         }
 670         if (copy_from_user(alarm_string, buffer, count)) {
 671                 result = -EFAULT;
 672                 goto end;
 673         }
 674         alarm_string[count] = 0;
 675         battery->alarm_capacity = simple_strtoul(alarm_string, NULL, 0) /
 676                                         acpi_battery_scale(battery);
 677         acpi_battery_set_alarm(battery);
 678       end:
 679         mutex_unlock(&sbs->lock);
 680         if (result)
 681                 return result;
 682         return count;
 683 }
 684
 685 static int acpi_battery_alarm_open_fs(struct inode *inode, struct file *file)
 686 {
 687         return single_open(file, acpi_battery_read_alarm, PDE(inode)->data);
 688 }
 689
 690 static struct file_operations acpi_battery_info_fops = {
 691         .open = acpi_battery_info_open_fs,
 692         .read = seq_read,
 693         .llseek = seq_lseek,
 694         .release = single_release,
 695         .owner = THIS_MODULE,
 696 };
 697
 698 static struct file_operations acpi_battery_state_fops = {
 699         .open = acpi_battery_state_open_fs,
 700         .read = seq_read,
 701         .llseek = seq_lseek,
 702         .release = single_release,
 703         .owner = THIS_MODULE,
 704 };
 705
 706 static struct file_operations acpi_battery_alarm_fops = {
 707         .open = acpi_battery_alarm_open_fs,
 708         .read = seq_read,
 709         .write = acpi_battery_write_alarm,
 710         .llseek = seq_lseek,
 711         .release = single_release,
 712         .owner = THIS_MODULE,
 713 };
 714
 715 /* Legacy AC Adapter Interface */
 716
 717 static struct proc_dir_entry *acpi_ac_dir = NULL;
 718
 719 static int acpi_ac_read_state(struct seq_file *seq, void *offset)
 720 {
 721
 722         struct acpi_sbs *sbs = seq->private;
 723
 724         mutex_lock(&sbs->lock);
 725
 726         seq_printf(seq, "state:                   %s\n",
 727                    sbs->charger_present ? "on-line" : "off-line");
 728
 729         mutex_unlock(&sbs->lock);
 730         return 0;
 731 }
 732
 733 static int acpi_ac_state_open_fs(struct inode *inode, struct file *file)
 734 {
 735         return single_open(file, acpi_ac_read_state, PDE(inode)->data);
 736 }
 737
 738 static struct file_operations acpi_ac_state_fops = {
 739         .open = acpi_ac_state_open_fs,
 740         .read = seq_read,
 741         .llseek = seq_lseek,
 742         .release = single_release,
 743         .owner = THIS_MODULE,
 744 };
 745
 746 #endif
 747
 748 /* --------------------------------------------------------------------------
 749                                  Driver Interface
 750    -------------------------------------------------------------------------- */
 751 static int acpi_battery_read(struct acpi_battery *battery)
 752 {
 753         int result = 0, saved_present = battery->present;
 754         u16 state;
 755
 756         if (battery->sbs->manager_present) {
 757                 result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
 758                                 ACPI_SBS_MANAGER, 0x01, (u8 *)&state);
 759                 if (!result)
 760                         battery->present = state & (1 << battery->id);
 761                 state &= 0x0fff;
 762                 state |= 1 << (battery->id + 12);
 763                 acpi_smbus_write(battery->sbs->hc, SMBUS_WRITE_WORD,
 764                                   ACPI_SBS_MANAGER, 0x01, (u8 *)&state, 2);
 765         } else if (battery->id == 0)
 766                 battery->present = 1;
 767         if (result || !battery->present)
 768                 return result;
 769
 770         if (saved_present != battery->present) {
 771                 battery->update_time = 0;
 772                 result = acpi_battery_get_info(battery);
 773                 if (result)
 774                         return result;
 775         }
 776         result = acpi_battery_get_state(battery);
 777         return result;
 778 }
 779
 780 /* Smart Battery */
 781 static int acpi_battery_add(struct acpi_sbs *sbs, int id)
 782 {
 783         struct acpi_battery *battery = &sbs->battery[id];
 784         int result;
 785
 786         battery->id = id;
 787         battery->sbs = sbs;
 788         result = acpi_battery_read(battery);
 789         if (result)
 790                 return result;
 791
 792         sprintf(battery->name, ACPI_BATTERY_DIR_NAME, id);
 793 #ifdef CONFIG_ACPI_PROCFS_POWER
 794         acpi_sbs_add_fs(&battery->proc_entry, acpi_battery_dir,
 795                         battery->name, &acpi_battery_info_fops,
 796                         &acpi_battery_state_fops, &acpi_battery_alarm_fops,
 797                         battery);
 798 #endif
 799         battery->bat.name = battery->name;
 800         battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
 801         if (!acpi_battery_mode(battery)) {
 802                 battery->bat.properties = sbs_charge_battery_props;
 803                 battery->bat.num_properties =
 804                     ARRAY_SIZE(sbs_charge_battery_props);
 805         } else {
 806                 battery->bat.properties = sbs_energy_battery_props;
 807                 battery->bat.num_properties =
 808                     ARRAY_SIZE(sbs_energy_battery_props);
 809         }
 810         battery->bat.get_property = acpi_sbs_battery_get_property;
 811         result = power_supply_register(&sbs->device->dev, &battery->bat);
 812         if (result)
 813                 goto end;
 814         result = device_create_file(battery->bat.dev, &alarm_attr);
 815         if (result)
 816                 goto end;
 817         battery->have_sysfs_alarm = 1;
 818       end:
 819         printk(KERN_INFO PREFIX "%s [%s]: Battery Slot [%s] (battery %s)\n",
 820                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
 821                battery->name, sbs->battery->present ? "present" : "absent");
 822         return result;
 823 }
 824
 825 static void acpi_battery_remove(struct acpi_sbs *sbs, int id)
 826 {
 827         struct acpi_battery *battery = &sbs->battery[id];
 828
 829         if (battery->bat.dev) {
 830                 if (battery->have_sysfs_alarm)
 831                         device_remove_file(battery->bat.dev, &alarm_attr);
 832                 power_supply_unregister(&battery->bat);
 833         }
 834 #ifdef CONFIG_ACPI_PROCFS_POWER
 835         if (battery->proc_entry)
 836                 acpi_sbs_remove_fs(&battery->proc_entry, acpi_battery_dir);
 837 #endif
 838 }
 839
 840 static int acpi_charger_add(struct acpi_sbs *sbs)
 841 {
 842         int result;
 843
 844         result = acpi_ac_get_present(sbs);
 845         if (result)
 846                 goto end;
 847 #ifdef CONFIG_ACPI_PROCFS_POWER
 848         result = acpi_sbs_add_fs(&sbs->charger_entry, acpi_ac_dir,
 849                                  ACPI_AC_DIR_NAME, NULL,
 850                                  &acpi_ac_state_fops, NULL, sbs);
 851         if (result)
 852                 goto end;
 853 #endif
 854         sbs->charger.name = "sbs-charger";
 855         sbs->charger.type = POWER_SUPPLY_TYPE_MAINS;
 856         sbs->charger.properties = sbs_ac_props;
 857         sbs->charger.num_properties = ARRAY_SIZE(sbs_ac_props);
 858         sbs->charger.get_property = sbs_get_ac_property;
 859         power_supply_register(&sbs->device->dev, &sbs->charger);
 860         printk(KERN_INFO PREFIX "%s [%s]: AC Adapter [%s] (%s)\n",
 861                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
 862                ACPI_AC_DIR_NAME, sbs->charger_present ? "on-line" : "off-line");
 863       end:
 864         return result;
 865 }
 866
 867 static void acpi_charger_remove(struct acpi_sbs *sbs)
 868 {
 869         if (sbs->charger.dev)
 870                 power_supply_unregister(&sbs->charger);
 871 #ifdef CONFIG_ACPI_PROCFS_POWER
 872         if (sbs->charger_entry)
 873                 acpi_sbs_remove_fs(&sbs->charger_entry, acpi_ac_dir);
 874 #endif
 875 }
 876
 877 void acpi_sbs_callback(void *context)
 878 {
 879         int id;
 880         struct acpi_sbs *sbs = context;
 881         struct acpi_battery *bat;
 882         u8 saved_charger_state = sbs->charger_present;
 883         u8 saved_battery_state;
 884         acpi_ac_get_present(sbs);
 885         if (sbs->charger_present != saved_charger_state) {
 886 #ifdef CONFIG_ACPI_PROC_EVENT
 887                 acpi_bus_generate_proc_event4(ACPI_AC_CLASS, ACPI_AC_DIR_NAME,
 888                                               ACPI_SBS_NOTIFY_STATUS,
 889                                               sbs->charger_present);
 890 #endif
 891                 kobject_uevent(&sbs->charger.dev->kobj, KOBJ_CHANGE);
 892         }
 893         if (sbs->manager_present) {
 894                 for (id = 0; id < MAX_SBS_BAT; ++id) {
 895                         if (!(sbs->batteries_supported & (1 << id)))
 896                                 continue;
 897                         bat = &sbs->battery[id];
 898                         saved_battery_state = bat->present;
 899                         acpi_battery_read(bat);
 900                         if (saved_battery_state == bat->present)
 901                                 continue;
 902 #ifdef CONFIG_ACPI_PROC_EVENT
 903                         acpi_bus_generate_proc_event4(ACPI_BATTERY_CLASS,
 904                                                       bat->name,
 905                                                       ACPI_SBS_NOTIFY_STATUS,
 906                                                       bat->present);
 907 #endif
 908                         kobject_uevent(&bat->bat.dev->kobj, KOBJ_CHANGE);
 909                 }
 910         }
 911 }
 912
 913 static int acpi_sbs_remove(struct acpi_device *device, int type);
 914
 915 static int acpi_sbs_add(struct acpi_device *device)
 916 {
 917         struct acpi_sbs *sbs;
 918         int result = 0;
 919         int id;
 920
 921         sbs = kzalloc(sizeof(struct acpi_sbs), GFP_KERNEL);
 922         if (!sbs) {
 923                 result = -ENOMEM;
 924                 goto end;
 925         }
 926
 927         mutex_init(&sbs->lock);
 928
 929         sbs->hc = acpi_driver_data(device->parent);
 930         sbs->device = device;
 931         strcpy(acpi_device_name(device), ACPI_SBS_DEVICE_NAME);
 932         strcpy(acpi_device_class(device), ACPI_SBS_CLASS);
 933         acpi_driver_data(device) = sbs;
 934
 935         result = acpi_charger_add(sbs);
 936         if (result)
 937                 goto end;
 938
 939         result = acpi_manager_get_info(sbs);
 940         if (!result) {
 941                 sbs->manager_present = 1;
 942                 for (id = 0; id < MAX_SBS_BAT; ++id)
 943                         if ((sbs->batteries_supported & (1 << id)))
 944                                 acpi_battery_add(sbs, id);
 945         } else
 946                 acpi_battery_add(sbs, 0);
 947         acpi_smbus_register_callback(sbs->hc, acpi_sbs_callback, sbs);
 948       end:
 949         if (result)
 950                 acpi_sbs_remove(device, 0);
 951         return result;
 952 }
 953
 954 static int acpi_sbs_remove(struct acpi_device *device, int type)
 955 {
 956         struct acpi_sbs *sbs;
 957         int id;
 958
 959         if (!device)
 960                 return -EINVAL;
 961         sbs = acpi_driver_data(device);
 962         if (!sbs)
 963                 return -EINVAL;
 964         mutex_lock(&sbs->lock);
 965         acpi_smbus_unregister_callback(sbs->hc);
 966         for (id = 0; id < MAX_SBS_BAT; ++id)
 967                 acpi_battery_remove(sbs, id);
 968         acpi_charger_remove(sbs);
 969         mutex_unlock(&sbs->lock);
 970         mutex_destroy(&sbs->lock);
 971         kfree(sbs);
 972         return 0;
 973 }
 974
 975 static void acpi_sbs_rmdirs(void)
 976 {
 977 #ifdef CONFIG_ACPI_PROCFS_POWER
 978         if (acpi_ac_dir) {
 979                 acpi_unlock_ac_dir(acpi_ac_dir);
 980                 acpi_ac_dir = NULL;
 981         }
 982         if (acpi_battery_dir) {
 983                 acpi_unlock_battery_dir(acpi_battery_dir);
 984                 acpi_battery_dir = NULL;
 985         }
 986 #endif
 987 }
 988
 989 static int acpi_sbs_resume(struct acpi_device *device)
 990 {
 991         struct acpi_sbs *sbs;
 992         if (!device)
 993                 return -EINVAL;
 994         sbs = device->driver_data;
 995         acpi_sbs_callback(sbs);
 996         return 0;
 997 }
 998
 999 static struct acpi_driver acpi_sbs_driver = {
1000         .name = "sbs",
1001         .class = ACPI_SBS_CLASS,
1002         .ids = sbs_device_ids,
1003         .ops = {
1004                 .add = acpi_sbs_add,
1005                 .remove = acpi_sbs_remove,
1006                 .resume = acpi_sbs_resume,
1007                 },
1008 };
1009
1010 static int __init acpi_sbs_init(void)
1011 {
1012         int result = 0;
1013
1014         if (acpi_disabled)
1015                 return -ENODEV;
1016 #ifdef CONFIG_ACPI_PROCFS_POWER
1017         acpi_ac_dir = acpi_lock_ac_dir();
1018         if (!acpi_ac_dir)
1019                 return -ENODEV;
1020         acpi_battery_dir = acpi_lock_battery_dir();
1021         if (!acpi_battery_dir) {
1022                 acpi_sbs_rmdirs();
1023                 return -ENODEV;
1024         }
1025 #endif
1026         result = acpi_bus_register_driver(&acpi_sbs_driver);
1027         if (result < 0) {
1028                 acpi_sbs_rmdirs();
1029                 return -ENODEV;
1030         }
1031         return 0;
1032 }
1033
1034 static void __exit acpi_sbs_exit(void)
1035 {
1036         acpi_bus_unregister_driver(&acpi_sbs_driver);
1037         acpi_sbs_rmdirs();
1038         return;
1039 }
1040
1041 module_init(acpi_sbs_init);
1042 module_exit(acpi_sbs_exit);