drivers/acpi/sbs.c

   1 /*
   2  *  sbs.c - ACPI Smart Battery System Driver ($Revision: 2.0 $)
   3  *
   4  *  Copyright (c) 2007 Alexey Starikovskiy <astarikovskiy@suse.de>
   5  *  Copyright (c) 2005-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com>
   6  *  Copyright (c) 2005 Rich Townsend <rhdt@bartol.udel.edu>
   7  *
   8  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 2 of the License, or (at
  13  *  your option) any later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful, but
  16  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  *  General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License along
  21  *  with this program; if not, write to the Free Software Foundation, Inc.,
  22  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  23  *
  24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  25  */
  26
  27 #include <linux/init.h>
  28 #include <linux/module.h>
  29 #include <linux/moduleparam.h>
  30 #include <linux/kernel.h>
  31
  32 #ifdef CONFIG_ACPI_PROCFS_POWER
  33 #include <linux/proc_fs.h>
  34 #include <linux/seq_file.h>
  35 #include <asm/uaccess.h>
  36 #endif
  37
  38 #include <linux/acpi.h>
  39 #include <linux/timer.h>
  40 #include <linux/jiffies.h>
  41 #include <linux/delay.h>
  42
  43 #ifdef CONFIG_ACPI_SYSFS_POWER
  44 #include <linux/power_supply.h>
  45 #endif
  46
  47 #include "sbshc.h"
  48
  49 #define PREFIX "ACPI: "
  50
  51 #define ACPI_SBS_CLASS                  "sbs"
  52 #define ACPI_AC_CLASS                   "ac_adapter"
  53 #define ACPI_BATTERY_CLASS              "battery"
  54 #define ACPI_SBS_DEVICE_NAME            "Smart Battery System"
  55 #define ACPI_SBS_FILE_INFO              "info"
  56 #define ACPI_SBS_FILE_STATE             "state"
  57 #define ACPI_SBS_FILE_ALARM             "alarm"
  58 #define ACPI_BATTERY_DIR_NAME           "BAT%i"
  59 #define ACPI_AC_DIR_NAME                "AC0"
  60
  61 #define ACPI_SBS_NOTIFY_STATUS          0x80
  62 #define ACPI_SBS_NOTIFY_INFO            0x81
  63
  64 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
  65 MODULE_DESCRIPTION("Smart Battery System ACPI interface driver");
  66 MODULE_LICENSE("GPL");
  67
  68 static unsigned int cache_time = 1000;
  69 module_param(cache_time, uint, 0644);
  70 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
  71
  72 extern struct proc_dir_entry *acpi_lock_ac_dir(void);
  73 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
  74 extern void acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
  75 extern void acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
  76
  77 #define MAX_SBS_BAT                     4
  78 #define ACPI_SBS_BLOCK_MAX              32
  79
  80 static const struct acpi_device_id sbs_device_ids[] = {
  81         {"ACPI0002", 0},
  82         {"", 0},
  83 };
  84 MODULE_DEVICE_TABLE(acpi, sbs_device_ids);
  85
  86 struct acpi_battery {
  87 #ifdef CONFIG_ACPI_SYSFS_POWER
  88         struct power_supply bat;
  89 #endif
  90         struct acpi_sbs *sbs;
  91 #ifdef CONFIG_ACPI_PROCFS_POWER
  92         struct proc_dir_entry *proc_entry;
  93 #endif
  94         unsigned long update_time;
  95         char name[8];
  96         char manufacturer_name[ACPI_SBS_BLOCK_MAX];
  97         char device_name[ACPI_SBS_BLOCK_MAX];
  98         char device_chemistry[ACPI_SBS_BLOCK_MAX];
  99         u16 alarm_capacity;
 100         u16 full_charge_capacity;
 101         u16 design_capacity;
 102         u16 design_voltage;
 103         u16 serial_number;
 104         u16 cycle_count;
 105         u16 temp_now;
 106         u16 voltage_now;
 107         s16 rate_now;
 108         s16 rate_avg;
 109         u16 capacity_now;
 110         u16 state_of_charge;
 111         u16 state;
 112         u16 mode;
 113         u16 spec;
 114         u8 id;
 115         u8 present:1;
 116         u8 have_sysfs_alarm:1;
 117 };
 118
 119 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
 120
 121 struct acpi_sbs {
 122 #ifdef CONFIG_ACPI_SYSFS_POWER
 123         struct power_supply charger;
 124 #endif
 125         struct acpi_device *device;
 126         struct acpi_smb_hc *hc;
 127         struct mutex lock;
 128 #ifdef CONFIG_ACPI_PROCFS_POWER
 129         struct proc_dir_entry *charger_entry;
 130 #endif
 131         struct acpi_battery battery[MAX_SBS_BAT];
 132         u8 batteries_supported:4;
 133         u8 manager_present:1;
 134         u8 charger_present:1;
 135 };
 136
 137 #define to_acpi_sbs(x) container_of(x, struct acpi_sbs, charger)
 138
 139 static inline int battery_scale(int log)
 140 {
 141         int scale = 1;
 142         while (log--)
 143                 scale *= 10;
 144         return scale;
 145 }
 146
 147 static inline int acpi_battery_vscale(struct acpi_battery *battery)
 148 {
 149         return battery_scale((battery->spec & 0x0f00) >> 8);
 150 }
 151
 152 static inline int acpi_battery_ipscale(struct acpi_battery *battery)
 153 {
 154         return battery_scale((battery->spec & 0xf000) >> 12);
 155 }
 156
 157 static inline int acpi_battery_mode(struct acpi_battery *battery)
 158 {
 159         return (battery->mode & 0x8000);
 160 }
 161
 162 static inline int acpi_battery_scale(struct acpi_battery *battery)
 163 {
 164         return (acpi_battery_mode(battery) ? 10 : 1) *
 165             acpi_battery_ipscale(battery);
 166 }
 167
 168 #ifdef CONFIG_ACPI_SYSFS_POWER
 169 static int sbs_get_ac_property(struct power_supply *psy,
 170                                enum power_supply_property psp,
 171                                union power_supply_propval *val)
 172 {
 173         struct acpi_sbs *sbs = to_acpi_sbs(psy);
 174         switch (psp) {
 175         case POWER_SUPPLY_PROP_ONLINE:
 176                 val->intval = sbs->charger_present;
 177                 break;
 178         default:
 179                 return -EINVAL;
 180         }
 181         return 0;
 182 }
 183
 184 static int acpi_battery_technology(struct acpi_battery *battery)
 185 {
 186         if (!strcasecmp("NiCd", battery->device_chemistry))
 187                 return POWER_SUPPLY_TECHNOLOGY_NiCd;
 188         if (!strcasecmp("NiMH", battery->device_chemistry))
 189                 return POWER_SUPPLY_TECHNOLOGY_NiMH;
 190         if (!strcasecmp("LION", battery->device_chemistry))
 191                 return POWER_SUPPLY_TECHNOLOGY_LION;
 192         if (!strcasecmp("LiP", battery->device_chemistry))
 193                 return POWER_SUPPLY_TECHNOLOGY_LIPO;
 194         return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 195 }
 196
 197 static int acpi_sbs_battery_get_property(struct power_supply *psy,
 198                                          enum power_supply_property psp,
 199                                          union power_supply_propval *val)
 200 {
 201         struct acpi_battery *battery = to_acpi_battery(psy);
 202
 203         if ((!battery->present) && psp != POWER_SUPPLY_PROP_PRESENT)
 204                 return -ENODEV;
 205         switch (psp) {
 206         case POWER_SUPPLY_PROP_STATUS:
 207                 if (battery->rate_now < 0)
 208                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 209                 else if (battery->rate_now > 0)
 210                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 211                 else
 212                         val->intval = POWER_SUPPLY_STATUS_FULL;
 213                 break;
 214         case POWER_SUPPLY_PROP_PRESENT:
 215                 val->intval = battery->present;
 216                 break;
 217         case POWER_SUPPLY_PROP_TECHNOLOGY:
 218                 val->intval = acpi_battery_technology(battery);
 219                 break;
 220         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 221                 val->intval = battery->design_voltage *
 222                         acpi_battery_vscale(battery) * 1000;
 223                 break;
 224         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 225                 val->intval = battery->voltage_now *
 226                                 acpi_battery_vscale(battery) * 1000;
 227                 break;
 228         case POWER_SUPPLY_PROP_CURRENT_NOW:
 229         case POWER_SUPPLY_PROP_POWER_NOW:
 230                 val->intval = abs(battery->rate_now) *
 231                                 acpi_battery_ipscale(battery) * 1000;
 232                 break;
 233         case POWER_SUPPLY_PROP_CURRENT_AVG:
 234         case POWER_SUPPLY_PROP_POWER_AVG:
 235                 val->intval = abs(battery->rate_avg) *
 236                                 acpi_battery_ipscale(battery) * 1000;
 237                 break;
 238         case POWER_SUPPLY_PROP_CAPACITY:
 239                 val->intval = battery->state_of_charge;
 240                 break;
 241         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 242         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 243                 val->intval = battery->design_capacity *
 244                         acpi_battery_scale(battery) * 1000;
 245                 break;
 246         case POWER_SUPPLY_PROP_CHARGE_FULL:
 247         case POWER_SUPPLY_PROP_ENERGY_FULL:
 248                 val->intval = battery->full_charge_capacity *
 249                         acpi_battery_scale(battery) * 1000;
 250                 break;
 251         case POWER_SUPPLY_PROP_CHARGE_NOW:
 252         case POWER_SUPPLY_PROP_ENERGY_NOW:
 253                 val->intval = battery->capacity_now *
 254                                 acpi_battery_scale(battery) * 1000;
 255                 break;
 256         case POWER_SUPPLY_PROP_TEMP:
 257                 val->intval = battery->temp_now - 2730; // dK -> dC
 258                 break;
 259         case POWER_SUPPLY_PROP_MODEL_NAME:
 260                 val->strval = battery->device_name;
 261                 break;
 262         case POWER_SUPPLY_PROP_MANUFACTURER:
 263                 val->strval = battery->manufacturer_name;
 264                 break;
 265         default:
 266                 return -EINVAL;
 267         }
 268         return 0;
 269 }
 270
 271 static enum power_supply_property sbs_ac_props[] = {
 272         POWER_SUPPLY_PROP_ONLINE,
 273 };
 274
 275 static enum power_supply_property sbs_charge_battery_props[] = {
 276         POWER_SUPPLY_PROP_STATUS,
 277         POWER_SUPPLY_PROP_PRESENT,
 278         POWER_SUPPLY_PROP_TECHNOLOGY,
 279         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 280         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 281         POWER_SUPPLY_PROP_CURRENT_NOW,
 282         POWER_SUPPLY_PROP_CURRENT_AVG,
 283         POWER_SUPPLY_PROP_CAPACITY,
 284         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 285         POWER_SUPPLY_PROP_CHARGE_FULL,
 286         POWER_SUPPLY_PROP_CHARGE_NOW,
 287         POWER_SUPPLY_PROP_TEMP,
 288         POWER_SUPPLY_PROP_MODEL_NAME,
 289         POWER_SUPPLY_PROP_MANUFACTURER,
 290 };
 291
 292 static enum power_supply_property sbs_energy_battery_props[] = {
 293         POWER_SUPPLY_PROP_STATUS,
 294         POWER_SUPPLY_PROP_PRESENT,
 295         POWER_SUPPLY_PROP_TECHNOLOGY,
 296         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 297         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 298         POWER_SUPPLY_PROP_CURRENT_NOW,
 299         POWER_SUPPLY_PROP_CURRENT_AVG,
 300         POWER_SUPPLY_PROP_POWER_NOW,
 301         POWER_SUPPLY_PROP_POWER_AVG,
 302         POWER_SUPPLY_PROP_CAPACITY,
 303         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 304         POWER_SUPPLY_PROP_ENERGY_FULL,
 305         POWER_SUPPLY_PROP_ENERGY_NOW,
 306         POWER_SUPPLY_PROP_TEMP,
 307         POWER_SUPPLY_PROP_MODEL_NAME,
 308         POWER_SUPPLY_PROP_MANUFACTURER,
 309 };
 310
 311 #endif
 312
 313 /* --------------------------------------------------------------------------
 314                             Smart Battery System Management
 315    -------------------------------------------------------------------------- */
 316
 317 struct acpi_battery_reader {
 318         u8 command;             /* command for battery */
 319         u8 mode;                /* word or block? */
 320         size_t offset;          /* offset inside struct acpi_sbs_battery */
 321 };
 322
 323 static struct acpi_battery_reader info_readers[] = {
 324         {0x01, SMBUS_READ_WORD, offsetof(struct acpi_battery, alarm_capacity)},
 325         {0x03, SMBUS_READ_WORD, offsetof(struct acpi_battery, mode)},
 326         {0x10, SMBUS_READ_WORD, offsetof(struct acpi_battery, full_charge_capacity)},
 327         {0x17, SMBUS_READ_WORD, offsetof(struct acpi_battery, cycle_count)},
 328         {0x18, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_capacity)},
 329         {0x19, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_voltage)},
 330         {0x1a, SMBUS_READ_WORD, offsetof(struct acpi_battery, spec)},
 331         {0x1c, SMBUS_READ_WORD, offsetof(struct acpi_battery, serial_number)},
 332         {0x20, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, manufacturer_name)},
 333         {0x21, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_name)},
 334         {0x22, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_chemistry)},
 335 };
 336
 337 static struct acpi_battery_reader state_readers[] = {
 338         {0x08, SMBUS_READ_WORD, offsetof(struct acpi_battery, temp_now)},
 339         {0x09, SMBUS_READ_WORD, offsetof(struct acpi_battery, voltage_now)},
 340         {0x0a, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_now)},
 341         {0x0b, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_avg)},
 342         {0x0f, SMBUS_READ_WORD, offsetof(struct acpi_battery, capacity_now)},
 343         {0x0e, SMBUS_READ_WORD, offsetof(struct acpi_battery, state_of_charge)},
 344         {0x16, SMBUS_READ_WORD, offsetof(struct acpi_battery, state)},
 345 };
 346
 347 static int acpi_manager_get_info(struct acpi_sbs *sbs)
 348 {
 349         int result = 0;
 350         u16 battery_system_info;
 351
 352         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
 353                                  0x04, (u8 *)&battery_system_info);
 354         if (!result)
 355                 sbs->batteries_supported = battery_system_info & 0x000f;
 356         return result;
 357 }
 358
 359 static int acpi_battery_get_info(struct acpi_battery *battery)
 360 {
 361         int i, result = 0;
 362
 363         for (i = 0; i < ARRAY_SIZE(info_readers); ++i) {
 364                 result = acpi_smbus_read(battery->sbs->hc,
 365                                          info_readers[i].mode,
 366                                          ACPI_SBS_BATTERY,
 367                                          info_readers[i].command,
 368                                          (u8 *) battery +
 369                                                 info_readers[i].offset);
 370                 if (result)
 371                         break;
 372         }
 373         return result;
 374 }
 375
 376 static int acpi_battery_get_state(struct acpi_battery *battery)
 377 {
 378         int i, result = 0;
 379
 380         if (battery->update_time &&
 381             time_before(jiffies, battery->update_time +
 382                                 msecs_to_jiffies(cache_time)))
 383                 return 0;
 384         for (i = 0; i < ARRAY_SIZE(state_readers); ++i) {
 385                 result = acpi_smbus_read(battery->sbs->hc,
 386                                          state_readers[i].mode,
 387                                          ACPI_SBS_BATTERY,
 388                                          state_readers[i].command,
 389                                          (u8 *)battery +
 390                                                 state_readers[i].offset);
 391                 if (result)
 392                         goto end;
 393         }
 394       end:
 395         battery->update_time = jiffies;
 396         return result;
 397 }
 398
 399 static int acpi_battery_get_alarm(struct acpi_battery *battery)
 400 {
 401         return acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
 402                                  ACPI_SBS_BATTERY, 0x01,
 403                                  (u8 *)&battery->alarm_capacity);
 404 }
 405
 406 static int acpi_battery_set_alarm(struct acpi_battery *battery)
 407 {
 408         struct acpi_sbs *sbs = battery->sbs;
 409         u16 value, sel = 1 << (battery->id + 12);
 410
 411         int ret;
 412
 413
 414         if (sbs->manager_present) {
 415                 ret = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
 416                                 0x01, (u8 *)&value);
 417                 if (ret)
 418                         goto end;
 419                 if ((value & 0xf000) != sel) {
 420                         value &= 0x0fff;
 421                         value |= sel;
 422                 ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD,
 423                                          ACPI_SBS_MANAGER,
 424                                          0x01, (u8 *)&value, 2);
 425                 if (ret)
 426                         goto end;
 427                 }
 428         }
 429         ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD, ACPI_SBS_BATTERY,
 430                                 0x01, (u8 *)&battery->alarm_capacity, 2);
 431       end:
 432         return ret;
 433 }
 434
 435 static int acpi_ac_get_present(struct acpi_sbs *sbs)
 436 {
 437         int result;
 438         u16 status;
 439
 440         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_CHARGER,
 441                                  0x13, (u8 *) & status);
 442         if (!result)
 443                 sbs->charger_present = (status >> 15) & 0x1;
 444         return result;
 445 }
 446
 447 #ifdef CONFIG_ACPI_SYSFS_POWER
 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 #endif
 478
 479 /* --------------------------------------------------------------------------
 480                               FS Interface (/proc/acpi)
 481    -------------------------------------------------------------------------- */
 482
 483 #ifdef CONFIG_ACPI_PROCFS_POWER
 484 /* Generic Routines */
 485 static int
 486 acpi_sbs_add_fs(struct proc_dir_entry **dir,
 487                 struct proc_dir_entry *parent_dir,
 488                 char *dir_name,
 489                 const struct file_operations *info_fops,
 490                 const struct file_operations *state_fops,
 491                 const struct file_operations *alarm_fops, void *data)
 492 {
 493         if (!*dir) {
 494                 *dir = proc_mkdir(dir_name, parent_dir);
 495                 if (!*dir) {
 496                         return -ENODEV;
 497                 }
 498         }
 499
 500         /* 'info' [R] */
 501         if (info_fops)
 502                 proc_create_data(ACPI_SBS_FILE_INFO, S_IRUGO, *dir,
 503                                  info_fops, data);
 504
 505         /* 'state' [R] */
 506         if (state_fops)
 507                 proc_create_data(ACPI_SBS_FILE_STATE, S_IRUGO, *dir,
 508                                  state_fops, data);
 509
 510         /* 'alarm' [R/W] */
 511         if (alarm_fops)
 512                 proc_create_data(ACPI_SBS_FILE_ALARM, S_IRUGO, *dir,
 513                                  alarm_fops, data);
 514         return 0;
 515 }
 516
 517 static void
 518 acpi_sbs_remove_fs(struct proc_dir_entry **dir,
 519                            struct proc_dir_entry *parent_dir)
 520 {
 521         if (*dir) {
 522                 remove_proc_entry(ACPI_SBS_FILE_INFO, *dir);
 523                 remove_proc_entry(ACPI_SBS_FILE_STATE, *dir);
 524                 remove_proc_entry(ACPI_SBS_FILE_ALARM, *dir);
 525                 remove_proc_entry((*dir)->name, parent_dir);
 526                 *dir = NULL;
 527         }
 528 }
 529
 530 /* Smart Battery Interface */
 531 static struct proc_dir_entry *acpi_battery_dir = NULL;
 532
 533 static inline char *acpi_battery_units(struct acpi_battery *battery)
 534 {
 535         return acpi_battery_mode(battery) ? " mW" : " mA";
 536 }
 537
 538
 539 static int acpi_battery_read_info(struct seq_file *seq, void *offset)
 540 {
 541         struct acpi_battery *battery = seq->private;
 542         struct acpi_sbs *sbs = battery->sbs;
 543         int result = 0;
 544
 545         mutex_lock(&sbs->lock);
 546
 547         seq_printf(seq, "present:                 %s\n",
 548                    (battery->present) ? "yes" : "no");
 549         if (!battery->present)
 550                 goto end;
 551
 552         seq_printf(seq, "design capacity:         %i%sh\n",
 553                    battery->design_capacity * acpi_battery_scale(battery),
 554                    acpi_battery_units(battery));
 555         seq_printf(seq, "last full capacity:      %i%sh\n",
 556                    battery->full_charge_capacity * acpi_battery_scale(battery),
 557                    acpi_battery_units(battery));
 558         seq_printf(seq, "battery technology:      rechargeable\n");
 559         seq_printf(seq, "design voltage:          %i mV\n",
 560                    battery->design_voltage * acpi_battery_vscale(battery));
 561         seq_printf(seq, "design capacity warning: unknown\n");
 562         seq_printf(seq, "design capacity low:     unknown\n");
 563         seq_printf(seq, "capacity granularity 1:  unknown\n");
 564         seq_printf(seq, "capacity granularity 2:  unknown\n");
 565         seq_printf(seq, "model number:            %s\n", battery->device_name);
 566         seq_printf(seq, "serial number:           %i\n",
 567                    battery->serial_number);
 568         seq_printf(seq, "battery type:            %s\n",
 569                    battery->device_chemistry);
 570         seq_printf(seq, "OEM info:                %s\n",
 571                    battery->manufacturer_name);
 572       end:
 573         mutex_unlock(&sbs->lock);
 574         return result;
 575 }
 576
 577 static int acpi_battery_info_open_fs(struct inode *inode, struct file *file)
 578 {
 579         return single_open(file, acpi_battery_read_info, PDE(inode)->data);
 580 }
 581
 582 static int acpi_battery_read_state(struct seq_file *seq, void *offset)
 583 {
 584         struct acpi_battery *battery = seq->private;
 585         struct acpi_sbs *sbs = battery->sbs;
 586         int rate;
 587
 588         mutex_lock(&sbs->lock);
 589         seq_printf(seq, "present:                 %s\n",
 590                    (battery->present) ? "yes" : "no");
 591         if (!battery->present)
 592                 goto end;
 593
 594         acpi_battery_get_state(battery);
 595         seq_printf(seq, "capacity state:          %s\n",
 596                    (battery->state & 0x0010) ? "critical" : "ok");
 597         seq_printf(seq, "charging state:          %s\n",
 598                    (battery->rate_now < 0) ? "discharging" :
 599                    ((battery->rate_now > 0) ? "charging" : "charged"));
 600         rate = abs(battery->rate_now) * acpi_battery_ipscale(battery);
 601         rate *= (acpi_battery_mode(battery))?(battery->voltage_now *
 602                         acpi_battery_vscale(battery)/1000):1;
 603         seq_printf(seq, "present rate:            %d%s\n", rate,
 604                    acpi_battery_units(battery));
 605         seq_printf(seq, "remaining capacity:      %i%sh\n",
 606                    battery->capacity_now * acpi_battery_scale(battery),
 607                    acpi_battery_units(battery));
 608         seq_printf(seq, "present voltage:         %i mV\n",
 609                    battery->voltage_now * acpi_battery_vscale(battery));
 610
 611       end:
 612         mutex_unlock(&sbs->lock);
 613         return 0;
 614 }
 615
 616 static int acpi_battery_state_open_fs(struct inode *inode, struct file *file)
 617 {
 618         return single_open(file, acpi_battery_read_state, PDE(inode)->data);
 619 }
 620
 621 static int acpi_battery_read_alarm(struct seq_file *seq, void *offset)
 622 {
 623         struct acpi_battery *battery = seq->private;
 624         struct acpi_sbs *sbs = battery->sbs;
 625         int result = 0;
 626
 627         mutex_lock(&sbs->lock);
 628
 629         if (!battery->present) {
 630                 seq_printf(seq, "present:                 no\n");
 631                 goto end;
 632         }
 633
 634         acpi_battery_get_alarm(battery);
 635         seq_printf(seq, "alarm:                   ");
 636         if (battery->alarm_capacity)
 637                 seq_printf(seq, "%i%sh\n",
 638                            battery->alarm_capacity *
 639                            acpi_battery_scale(battery),
 640                            acpi_battery_units(battery));
 641         else
 642                 seq_printf(seq, "disabled\n");
 643       end:
 644         mutex_unlock(&sbs->lock);
 645         return result;
 646 }
 647
 648 static ssize_t
 649 acpi_battery_write_alarm(struct file *file, const char __user * buffer,
 650                          size_t count, loff_t * ppos)
 651 {
 652         struct seq_file *seq = file->private_data;
 653         struct acpi_battery *battery = seq->private;
 654         struct acpi_sbs *sbs = battery->sbs;
 655         char alarm_string[12] = { '\0' };
 656         int result = 0;
 657         mutex_lock(&sbs->lock);
 658         if (!battery->present) {
 659                 result = -ENODEV;
 660                 goto end;
 661         }
 662         if (count > sizeof(alarm_string) - 1) {
 663                 result = -EINVAL;
 664                 goto end;
 665         }
 666         if (copy_from_user(alarm_string, buffer, count)) {
 667                 result = -EFAULT;
 668                 goto end;
 669         }
 670         alarm_string[count] = 0;
 671         battery->alarm_capacity = simple_strtoul(alarm_string, NULL, 0) /
 672                                         acpi_battery_scale(battery);
 673         acpi_battery_set_alarm(battery);
 674       end:
 675         mutex_unlock(&sbs->lock);
 676         if (result)
 677                 return result;
 678         return count;
 679 }
 680
 681 static int acpi_battery_alarm_open_fs(struct inode *inode, struct file *file)
 682 {
 683         return single_open(file, acpi_battery_read_alarm, PDE(inode)->data);
 684 }
 685
 686 static const struct file_operations acpi_battery_info_fops = {
 687         .open = acpi_battery_info_open_fs,
 688         .read = seq_read,
 689         .llseek = seq_lseek,
 690         .release = single_release,
 691         .owner = THIS_MODULE,
 692 };
 693
 694 static const struct file_operations acpi_battery_state_fops = {
 695         .open = acpi_battery_state_open_fs,
 696         .read = seq_read,
 697         .llseek = seq_lseek,
 698         .release = single_release,
 699         .owner = THIS_MODULE,
 700 };
 701
 702 static const struct file_operations acpi_battery_alarm_fops = {
 703         .open = acpi_battery_alarm_open_fs,
 704         .read = seq_read,
 705         .write = acpi_battery_write_alarm,
 706         .llseek = seq_lseek,
 707         .release = single_release,
 708         .owner = THIS_MODULE,
 709 };
 710
 711 /* Legacy AC Adapter Interface */
 712
 713 static struct proc_dir_entry *acpi_ac_dir = NULL;
 714
 715 static int acpi_ac_read_state(struct seq_file *seq, void *offset)
 716 {
 717
 718         struct acpi_sbs *sbs = seq->private;
 719
 720         mutex_lock(&sbs->lock);
 721
 722         seq_printf(seq, "state:                   %s\n",
 723                    sbs->charger_present ? "on-line" : "off-line");
 724
 725         mutex_unlock(&sbs->lock);
 726         return 0;
 727 }
 728
 729 static int acpi_ac_state_open_fs(struct inode *inode, struct file *file)
 730 {
 731         return single_open(file, acpi_ac_read_state, PDE(inode)->data);
 732 }
 733
 734 static const struct file_operations acpi_ac_state_fops = {
 735         .open = acpi_ac_state_open_fs,
 736         .read = seq_read,
 737         .llseek = seq_lseek,
 738         .release = single_release,
 739         .owner = THIS_MODULE,
 740 };
 741
 742 #endif
 743
 744 /* --------------------------------------------------------------------------
 745                                  Driver Interface
 746    -------------------------------------------------------------------------- */
 747 static int acpi_battery_read(struct acpi_battery *battery)
 748 {
 749         int result = 0, saved_present = battery->present;
 750         u16 state;
 751
 752         if (battery->sbs->manager_present) {
 753                 result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
 754                                 ACPI_SBS_MANAGER, 0x01, (u8 *)&state);
 755                 if (!result)
 756                         battery->present = state & (1 << battery->id);
 757                 state &= 0x0fff;
 758                 state |= 1 << (battery->id + 12);
 759                 acpi_smbus_write(battery->sbs->hc, SMBUS_WRITE_WORD,
 760                                   ACPI_SBS_MANAGER, 0x01, (u8 *)&state, 2);
 761         } else if (battery->id == 0)
 762                 battery->present = 1;
 763         if (result || !battery->present)
 764                 return result;
 765
 766         if (saved_present != battery->present) {
 767                 battery->update_time = 0;
 768                 result = acpi_battery_get_info(battery);
 769                 if (result)
 770                         return result;
 771         }
 772         result = acpi_battery_get_state(battery);
 773         return result;
 774 }
 775
 776 /* Smart Battery */
 777 static int acpi_battery_add(struct acpi_sbs *sbs, int id)
 778 {
 779         struct acpi_battery *battery = &sbs->battery[id];
 780         int result;
 781
 782         battery->id = id;
 783         battery->sbs = sbs;
 784         result = acpi_battery_read(battery);
 785         if (result)
 786                 return result;
 787
 788         sprintf(battery->name, ACPI_BATTERY_DIR_NAME, id);
 789 #ifdef CONFIG_ACPI_PROCFS_POWER
 790         acpi_sbs_add_fs(&battery->proc_entry, acpi_battery_dir,
 791                         battery->name, &acpi_battery_info_fops,
 792                         &acpi_battery_state_fops, &acpi_battery_alarm_fops,
 793                         battery);
 794 #endif
 795 #ifdef CONFIG_ACPI_SYSFS_POWER
 796         battery->bat.name = battery->name;
 797         battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
 798         if (!acpi_battery_mode(battery)) {
 799                 battery->bat.properties = sbs_charge_battery_props;
 800                 battery->bat.num_properties =
 801                     ARRAY_SIZE(sbs_charge_battery_props);
 802         } else {
 803                 battery->bat.properties = sbs_energy_battery_props;
 804                 battery->bat.num_properties =
 805                     ARRAY_SIZE(sbs_energy_battery_props);
 806         }
 807         battery->bat.get_property = acpi_sbs_battery_get_property;
 808         result = power_supply_register(&sbs->device->dev, &battery->bat);
 809         if (result)
 810                 goto end;
 811         result = device_create_file(battery->bat.dev, &alarm_attr);
 812         if (result)
 813                 goto end;
 814         battery->have_sysfs_alarm = 1;
 815       end:
 816 #endif
 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 #ifdef CONFIG_ACPI_SYSFS_POWER
 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 #endif
 833 #ifdef CONFIG_ACPI_PROCFS_POWER
 834         if (battery->proc_entry)
 835                 acpi_sbs_remove_fs(&battery->proc_entry, acpi_battery_dir);
 836 #endif
 837 }
 838
 839 static int acpi_charger_add(struct acpi_sbs *sbs)
 840 {
 841         int result;
 842
 843         result = acpi_ac_get_present(sbs);
 844         if (result)
 845                 goto end;
 846 #ifdef CONFIG_ACPI_PROCFS_POWER
 847         result = acpi_sbs_add_fs(&sbs->charger_entry, acpi_ac_dir,
 848                                  ACPI_AC_DIR_NAME, NULL,
 849                                  &acpi_ac_state_fops, NULL, sbs);
 850         if (result)
 851                 goto end;
 852 #endif
 853 #ifdef CONFIG_ACPI_SYSFS_POWER
 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 #endif
 861         printk(KERN_INFO PREFIX "%s [%s]: AC Adapter [%s] (%s)\n",
 862                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
 863                ACPI_AC_DIR_NAME, sbs->charger_present ? "on-line" : "off-line");
 864       end:
 865         return result;
 866 }
 867
 868 static void acpi_charger_remove(struct acpi_sbs *sbs)
 869 {
 870 #ifdef CONFIG_ACPI_SYSFS_POWER
 871         if (sbs->charger.dev)
 872                 power_supply_unregister(&sbs->charger);
 873 #endif
 874 #ifdef CONFIG_ACPI_PROCFS_POWER
 875         if (sbs->charger_entry)
 876                 acpi_sbs_remove_fs(&sbs->charger_entry, acpi_ac_dir);
 877 #endif
 878 }
 879
 880 static void acpi_sbs_callback(void *context)
 881 {
 882         int id;
 883         struct acpi_sbs *sbs = context;
 884         struct acpi_battery *bat;
 885         u8 saved_charger_state = sbs->charger_present;
 886         u8 saved_battery_state;
 887         acpi_ac_get_present(sbs);
 888         if (sbs->charger_present != saved_charger_state) {
 889 #ifdef CONFIG_ACPI_PROC_EVENT
 890                 acpi_bus_generate_proc_event4(ACPI_AC_CLASS, ACPI_AC_DIR_NAME,
 891                                               ACPI_SBS_NOTIFY_STATUS,
 892                                               sbs->charger_present);
 893 #endif
 894 #ifdef CONFIG_ACPI_SYSFS_POWER
 895                 kobject_uevent(&sbs->charger.dev->kobj, KOBJ_CHANGE);
 896 #endif
 897         }
 898         if (sbs->manager_present) {
 899                 for (id = 0; id < MAX_SBS_BAT; ++id) {
 900                         if (!(sbs->batteries_supported & (1 << id)))
 901                                 continue;
 902                         bat = &sbs->battery[id];
 903                         saved_battery_state = bat->present;
 904                         acpi_battery_read(bat);
 905                         if (saved_battery_state == bat->present)
 906                                 continue;
 907 #ifdef CONFIG_ACPI_PROC_EVENT
 908                         acpi_bus_generate_proc_event4(ACPI_BATTERY_CLASS,
 909                                                       bat->name,
 910                                                       ACPI_SBS_NOTIFY_STATUS,
 911                                                       bat->present);
 912 #endif
 913 #ifdef CONFIG_ACPI_SYSFS_POWER
 914                         kobject_uevent(&bat->bat.dev->kobj, KOBJ_CHANGE);
 915 #endif
 916                 }
 917         }
 918 }
 919
 920 static int acpi_sbs_remove(struct acpi_device *device, int type);
 921
 922 static int acpi_sbs_add(struct acpi_device *device)
 923 {
 924         struct acpi_sbs *sbs;
 925         int result = 0;
 926         int id;
 927
 928         sbs = kzalloc(sizeof(struct acpi_sbs), GFP_KERNEL);
 929         if (!sbs) {
 930                 result = -ENOMEM;
 931                 goto end;
 932         }
 933
 934         mutex_init(&sbs->lock);
 935
 936         sbs->hc = acpi_driver_data(device->parent);
 937         sbs->device = device;
 938         strcpy(acpi_device_name(device), ACPI_SBS_DEVICE_NAME);
 939         strcpy(acpi_device_class(device), ACPI_SBS_CLASS);
 940         device->driver_data = sbs;
 941
 942         result = acpi_charger_add(sbs);
 943         if (result)
 944                 goto end;
 945
 946         result = acpi_manager_get_info(sbs);
 947         if (!result) {
 948                 sbs->manager_present = 1;
 949                 for (id = 0; id < MAX_SBS_BAT; ++id)
 950                         if ((sbs->batteries_supported & (1 << id)))
 951                                 acpi_battery_add(sbs, id);
 952         } else
 953                 acpi_battery_add(sbs, 0);
 954         acpi_smbus_register_callback(sbs->hc, acpi_sbs_callback, sbs);
 955       end:
 956         if (result)
 957                 acpi_sbs_remove(device, 0);
 958         return result;
 959 }
 960
 961 static int acpi_sbs_remove(struct acpi_device *device, int type)
 962 {
 963         struct acpi_sbs *sbs;
 964         int id;
 965
 966         if (!device)
 967                 return -EINVAL;
 968         sbs = acpi_driver_data(device);
 969         if (!sbs)
 970                 return -EINVAL;
 971         mutex_lock(&sbs->lock);
 972         acpi_smbus_unregister_callback(sbs->hc);
 973         for (id = 0; id < MAX_SBS_BAT; ++id)
 974                 acpi_battery_remove(sbs, id);
 975         acpi_charger_remove(sbs);
 976         mutex_unlock(&sbs->lock);
 977         mutex_destroy(&sbs->lock);
 978         kfree(sbs);
 979         return 0;
 980 }
 981
 982 static void acpi_sbs_rmdirs(void)
 983 {
 984 #ifdef CONFIG_ACPI_PROCFS_POWER
 985         if (acpi_ac_dir) {
 986                 acpi_unlock_ac_dir(acpi_ac_dir);
 987                 acpi_ac_dir = NULL;
 988         }
 989         if (acpi_battery_dir) {
 990                 acpi_unlock_battery_dir(acpi_battery_dir);
 991                 acpi_battery_dir = NULL;
 992         }
 993 #endif
 994 }
 995
 996 static int acpi_sbs_resume(struct acpi_device *device)
 997 {
 998         struct acpi_sbs *sbs;
 999         if (!device)
1000                 return -EINVAL;
1001         sbs = device->driver_data;
1002         acpi_sbs_callback(sbs);
1003         return 0;
1004 }
1005
1006 static struct acpi_driver acpi_sbs_driver = {
1007         .name = "sbs",
1008         .class = ACPI_SBS_CLASS,
1009         .ids = sbs_device_ids,
1010         .ops = {
1011                 .add = acpi_sbs_add,
1012                 .remove = acpi_sbs_remove,
1013                 .resume = acpi_sbs_resume,
1014                 },
1015 };
1016
1017 static int __init acpi_sbs_init(void)
1018 {
1019         int result = 0;
1020
1021         if (acpi_disabled)
1022                 return -ENODEV;
1023 #ifdef CONFIG_ACPI_PROCFS_POWER
1024         acpi_ac_dir = acpi_lock_ac_dir();
1025         if (!acpi_ac_dir)
1026                 return -ENODEV;
1027         acpi_battery_dir = acpi_lock_battery_dir();
1028         if (!acpi_battery_dir) {
1029                 acpi_sbs_rmdirs();
1030                 return -ENODEV;
1031         }
1032 #endif
1033         result = acpi_bus_register_driver(&acpi_sbs_driver);
1034         if (result < 0) {
1035                 acpi_sbs_rmdirs();
1036                 return -ENODEV;
1037         }
1038         return 0;
1039 }
1040
1041 static void __exit acpi_sbs_exit(void)
1042 {
1043         acpi_bus_unregister_driver(&acpi_sbs_driver);
1044         acpi_sbs_rmdirs();
1045         return;
1046 }
1047
1048 module_init(acpi_sbs_init);
1049 module_exit(acpi_sbs_exit);