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