drivers/acpi/sbs.c

   1 /*
   2  *  sbs.c - ACPI Smart Battery System Driver ($Revision: 2.0 $)
   3  *
   4  *  Copyright (c) 2007 Alexey Starikovskiy <astarikovskiy@suse.de>
   5  *  Copyright (c) 2005-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com>
   6  *  Copyright (c) 2005 Rich Townsend <rhdt@bartol.udel.edu>
   7  *
   8  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 2 of the License, or (at
  13  *  your option) any later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful, but
  16  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  *  General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License along
  21  *  with this program; if not, write to the Free Software Foundation, Inc.,
  22  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  23  *
  24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  25  */
  26
  27 #include <linux/init.h>
  28 #include <linux/slab.h>
  29 #include <linux/module.h>
  30 #include <linux/moduleparam.h>
  31 #include <linux/kernel.h>
  32
  33 #ifdef CONFIG_ACPI_PROCFS_POWER
  34 #include <linux/proc_fs.h>
  35 #include <linux/seq_file.h>
  36 #include <asm/uaccess.h>
  37 #endif
  38
  39 #include <linux/acpi.h>
  40 #include <linux/timer.h>
  41 #include <linux/jiffies.h>
  42 #include <linux/delay.h>
  43 #include <linux/power_supply.h>
  44
  45 #include "sbshc.h"
  46
  47 #define PREFIX "ACPI: "
  48
  49 #define ACPI_SBS_CLASS                  "sbs"
  50 #define ACPI_AC_CLASS                   "ac_adapter"
  51 #define ACPI_BATTERY_CLASS              "battery"
  52 #define ACPI_SBS_DEVICE_NAME            "Smart Battery System"
  53 #define ACPI_SBS_FILE_INFO              "info"
  54 #define ACPI_SBS_FILE_STATE             "state"
  55 #define ACPI_SBS_FILE_ALARM             "alarm"
  56 #define ACPI_BATTERY_DIR_NAME           "BAT%i"
  57 #define ACPI_AC_DIR_NAME                "AC0"
  58
  59 #define ACPI_SBS_NOTIFY_STATUS          0x80
  60 #define ACPI_SBS_NOTIFY_INFO            0x81
  61
  62 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
  63 MODULE_DESCRIPTION("Smart Battery System ACPI interface driver");
  64 MODULE_LICENSE("GPL");
  65
  66 static unsigned int cache_time = 1000;
  67 module_param(cache_time, uint, 0644);
  68 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
  69
  70 extern struct proc_dir_entry *acpi_lock_ac_dir(void);
  71 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
  72 extern void acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
  73 extern void acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
  74
  75 #define MAX_SBS_BAT                     4
  76 #define ACPI_SBS_BLOCK_MAX              32
  77
  78 static const struct acpi_device_id sbs_device_ids[] = {
  79         {"ACPI0002", 0},
  80         {"", 0},
  81 };
  82 MODULE_DEVICE_TABLE(acpi, sbs_device_ids);
  83
  84 struct acpi_battery {
  85         struct power_supply bat;
  86         struct acpi_sbs *sbs;
  87 #ifdef CONFIG_ACPI_PROCFS_POWER
  88         struct proc_dir_entry *proc_entry;
  89 #endif
  90         unsigned long update_time;
  91         char name[8];
  92         char manufacturer_name[ACPI_SBS_BLOCK_MAX];
  93         char device_name[ACPI_SBS_BLOCK_MAX];
  94         char device_chemistry[ACPI_SBS_BLOCK_MAX];
  95         u16 alarm_capacity;
  96         u16 full_charge_capacity;
  97         u16 design_capacity;
  98         u16 design_voltage;
  99         u16 serial_number;
 100         u16 cycle_count;
 101         u16 temp_now;
 102         u16 voltage_now;
 103         s16 rate_now;
 104         s16 rate_avg;
 105         u16 capacity_now;
 106         u16 state_of_charge;
 107         u16 state;
 108         u16 mode;
 109         u16 spec;
 110         u8 id;
 111         u8 present:1;
 112         u8 have_sysfs_alarm:1;
 113 };
 114
 115 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
 116
 117 struct acpi_sbs {
 118         struct power_supply charger;
 119         struct acpi_device *device;
 120         struct acpi_smb_hc *hc;
 121         struct mutex lock;
 122 #ifdef CONFIG_ACPI_PROCFS_POWER
 123         struct proc_dir_entry *charger_entry;
 124 #endif
 125         struct acpi_battery battery[MAX_SBS_BAT];
 126         u8 batteries_supported:4;
 127         u8 manager_present:1;
 128         u8 charger_present:1;
 129 };
 130
 131 #define to_acpi_sbs(x) container_of(x, struct acpi_sbs, charger)
 132
 133 static inline int battery_scale(int log)
 134 {
 135         int scale = 1;
 136         while (log--)
 137                 scale *= 10;
 138         return scale;
 139 }
 140
 141 static inline int acpi_battery_vscale(struct acpi_battery *battery)
 142 {
 143         return battery_scale((battery->spec & 0x0f00) >> 8);
 144 }
 145
 146 static inline int acpi_battery_ipscale(struct acpi_battery *battery)
 147 {
 148         return battery_scale((battery->spec & 0xf000) >> 12);
 149 }
 150
 151 static inline int acpi_battery_mode(struct acpi_battery *battery)
 152 {
 153         return (battery->mode & 0x8000);
 154 }
 155
 156 static inline int acpi_battery_scale(struct acpi_battery *battery)
 157 {
 158         return (acpi_battery_mode(battery) ? 10 : 1) *
 159             acpi_battery_ipscale(battery);
 160 }
 161
 162 static int sbs_get_ac_property(struct power_supply *psy,
 163                                enum power_supply_property psp,
 164                                union power_supply_propval *val)
 165 {
 166         struct acpi_sbs *sbs = to_acpi_sbs(psy);
 167         switch (psp) {
 168         case POWER_SUPPLY_PROP_ONLINE:
 169                 val->intval = sbs->charger_present;
 170                 break;
 171         default:
 172                 return -EINVAL;
 173         }
 174         return 0;
 175 }
 176
 177 static int acpi_battery_technology(struct acpi_battery *battery)
 178 {
 179         if (!strcasecmp("NiCd", battery->device_chemistry))
 180                 return POWER_SUPPLY_TECHNOLOGY_NiCd;
 181         if (!strcasecmp("NiMH", battery->device_chemistry))
 182                 return POWER_SUPPLY_TECHNOLOGY_NiMH;
 183         if (!strcasecmp("LION", battery->device_chemistry))
 184                 return POWER_SUPPLY_TECHNOLOGY_LION;
 185         if (!strcasecmp("LiP", battery->device_chemistry))
 186                 return POWER_SUPPLY_TECHNOLOGY_LIPO;
 187         return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 188 }
 189
 190 static int acpi_sbs_battery_get_property(struct power_supply *psy,
 191                                          enum power_supply_property psp,
 192                                          union power_supply_propval *val)
 193 {
 194         struct acpi_battery *battery = to_acpi_battery(psy);
 195
 196         if ((!battery->present) && psp != POWER_SUPPLY_PROP_PRESENT)
 197                 return -ENODEV;
 198         switch (psp) {
 199         case POWER_SUPPLY_PROP_STATUS:
 200                 if (battery->rate_now < 0)
 201                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 202                 else if (battery->rate_now > 0)
 203                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 204                 else
 205                         val->intval = POWER_SUPPLY_STATUS_FULL;
 206                 break;
 207         case POWER_SUPPLY_PROP_PRESENT:
 208                 val->intval = battery->present;
 209                 break;
 210         case POWER_SUPPLY_PROP_TECHNOLOGY:
 211                 val->intval = acpi_battery_technology(battery);
 212                 break;
 213         case POWER_SUPPLY_PROP_CYCLE_COUNT:
 214                 val->intval = battery->cycle_count;
 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         case POWER_SUPPLY_PROP_POWER_NOW:
 226                 val->intval = abs(battery->rate_now) *
 227                                 acpi_battery_ipscale(battery) * 1000;
 228                 break;
 229         case POWER_SUPPLY_PROP_CURRENT_AVG:
 230         case POWER_SUPPLY_PROP_POWER_AVG:
 231                 val->intval = abs(battery->rate_avg) *
 232                                 acpi_battery_ipscale(battery) * 1000;
 233                 break;
 234         case POWER_SUPPLY_PROP_CAPACITY:
 235                 val->intval = battery->state_of_charge;
 236                 break;
 237         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 238         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 239                 val->intval = battery->design_capacity *
 240                         acpi_battery_scale(battery) * 1000;
 241                 break;
 242         case POWER_SUPPLY_PROP_CHARGE_FULL:
 243         case POWER_SUPPLY_PROP_ENERGY_FULL:
 244                 val->intval = battery->full_charge_capacity *
 245                         acpi_battery_scale(battery) * 1000;
 246                 break;
 247         case POWER_SUPPLY_PROP_CHARGE_NOW:
 248         case POWER_SUPPLY_PROP_ENERGY_NOW:
 249                 val->intval = battery->capacity_now *
 250                                 acpi_battery_scale(battery) * 1000;
 251                 break;
 252         case POWER_SUPPLY_PROP_TEMP:
 253                 val->intval = battery->temp_now - 2730; // dK -> dC
 254                 break;
 255         case POWER_SUPPLY_PROP_MODEL_NAME:
 256                 val->strval = battery->device_name;
 257                 break;
 258         case POWER_SUPPLY_PROP_MANUFACTURER:
 259                 val->strval = battery->manufacturer_name;
 260                 break;
 261         default:
 262                 return -EINVAL;
 263         }
 264         return 0;
 265 }
 266
 267 static enum power_supply_property sbs_ac_props[] = {
 268         POWER_SUPPLY_PROP_ONLINE,
 269 };
 270
 271 static enum power_supply_property sbs_charge_battery_props[] = {
 272         POWER_SUPPLY_PROP_STATUS,
 273         POWER_SUPPLY_PROP_PRESENT,
 274         POWER_SUPPLY_PROP_TECHNOLOGY,
 275         POWER_SUPPLY_PROP_CYCLE_COUNT,
 276         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 277         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 278         POWER_SUPPLY_PROP_CURRENT_NOW,
 279         POWER_SUPPLY_PROP_CURRENT_AVG,
 280         POWER_SUPPLY_PROP_CAPACITY,
 281         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 282         POWER_SUPPLY_PROP_CHARGE_FULL,
 283         POWER_SUPPLY_PROP_CHARGE_NOW,
 284         POWER_SUPPLY_PROP_TEMP,
 285         POWER_SUPPLY_PROP_MODEL_NAME,
 286         POWER_SUPPLY_PROP_MANUFACTURER,
 287 };
 288
 289 static enum power_supply_property sbs_energy_battery_props[] = {
 290         POWER_SUPPLY_PROP_STATUS,
 291         POWER_SUPPLY_PROP_PRESENT,
 292         POWER_SUPPLY_PROP_TECHNOLOGY,
 293         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 294         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 295         POWER_SUPPLY_PROP_CURRENT_NOW,
 296         POWER_SUPPLY_PROP_CURRENT_AVG,
 297         POWER_SUPPLY_PROP_POWER_NOW,
 298         POWER_SUPPLY_PROP_POWER_AVG,
 299         POWER_SUPPLY_PROP_CAPACITY,
 300         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 301         POWER_SUPPLY_PROP_ENERGY_FULL,
 302         POWER_SUPPLY_PROP_ENERGY_NOW,
 303         POWER_SUPPLY_PROP_TEMP,
 304         POWER_SUPPLY_PROP_MODEL_NAME,
 305         POWER_SUPPLY_PROP_MANUFACTURER,
 306 };
 307
 308
 309 /* --------------------------------------------------------------------------
 310                             Smart Battery System Management
 311    -------------------------------------------------------------------------- */
 312
 313 struct acpi_battery_reader {
 314         u8 command;             /* command for battery */
 315         u8 mode;                /* word or block? */
 316         size_t offset;          /* offset inside struct acpi_sbs_battery */
 317 };
 318
 319 static struct acpi_battery_reader info_readers[] = {
 320         {0x01, SMBUS_READ_WORD, offsetof(struct acpi_battery, alarm_capacity)},
 321         {0x03, SMBUS_READ_WORD, offsetof(struct acpi_battery, mode)},
 322         {0x10, SMBUS_READ_WORD, offsetof(struct acpi_battery, full_charge_capacity)},
 323         {0x17, SMBUS_READ_WORD, offsetof(struct acpi_battery, cycle_count)},
 324         {0x18, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_capacity)},
 325         {0x19, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_voltage)},
 326         {0x1a, SMBUS_READ_WORD, offsetof(struct acpi_battery, spec)},
 327         {0x1c, SMBUS_READ_WORD, offsetof(struct acpi_battery, serial_number)},
 328         {0x20, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, manufacturer_name)},
 329         {0x21, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_name)},
 330         {0x22, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_chemistry)},
 331 };
 332
 333 static struct acpi_battery_reader state_readers[] = {
 334         {0x08, SMBUS_READ_WORD, offsetof(struct acpi_battery, temp_now)},
 335         {0x09, SMBUS_READ_WORD, offsetof(struct acpi_battery, voltage_now)},
 336         {0x0a, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_now)},
 337         {0x0b, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_avg)},
 338         {0x0f, SMBUS_READ_WORD, offsetof(struct acpi_battery, capacity_now)},
 339         {0x0e, SMBUS_READ_WORD, offsetof(struct acpi_battery, state_of_charge)},
 340         {0x16, SMBUS_READ_WORD, offsetof(struct acpi_battery, state)},
 341 };
 342
 343 static int acpi_manager_get_info(struct acpi_sbs *sbs)
 344 {
 345         int result = 0;
 346         u16 battery_system_info;
 347
 348         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
 349                                  0x04, (u8 *)&battery_system_info);
 350         if (!result)
 351                 sbs->batteries_supported = battery_system_info & 0x000f;
 352         return result;
 353 }
 354
 355 static int acpi_battery_get_info(struct acpi_battery *battery)
 356 {
 357         int i, result = 0;
 358
 359         for (i = 0; i < ARRAY_SIZE(info_readers); ++i) {
 360                 result = acpi_smbus_read(battery->sbs->hc,
 361                                          info_readers[i].mode,
 362                                          ACPI_SBS_BATTERY,
 363                                          info_readers[i].command,
 364                                          (u8 *) battery +
 365                                                 info_readers[i].offset);
 366                 if (result)
 367                         break;
 368         }
 369         return result;
 370 }
 371
 372 static int acpi_battery_get_state(struct acpi_battery *battery)
 373 {
 374         int i, result = 0;
 375
 376         if (battery->update_time &&
 377             time_before(jiffies, battery->update_time +
 378                                 msecs_to_jiffies(cache_time)))
 379                 return 0;
 380         for (i = 0; i < ARRAY_SIZE(state_readers); ++i) {
 381                 result = acpi_smbus_read(battery->sbs->hc,
 382                                          state_readers[i].mode,
 383                                          ACPI_SBS_BATTERY,
 384                                          state_readers[i].command,
 385                                          (u8 *)battery +
 386                                                 state_readers[i].offset);
 387                 if (result)
 388                         goto end;
 389         }
 390       end:
 391         battery->update_time = jiffies;
 392         return result;
 393 }
 394
 395 static int acpi_battery_get_alarm(struct acpi_battery *battery)
 396 {
 397         return acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
 398                                  ACPI_SBS_BATTERY, 0x01,
 399                                  (u8 *)&battery->alarm_capacity);
 400 }
 401
 402 static int acpi_battery_set_alarm(struct acpi_battery *battery)
 403 {
 404         struct acpi_sbs *sbs = battery->sbs;
 405         u16 value, sel = 1 << (battery->id + 12);
 406
 407         int ret;
 408
 409
 410         if (sbs->manager_present) {
 411                 ret = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
 412                                 0x01, (u8 *)&value);
 413                 if (ret)
 414                         goto end;
 415                 if ((value & 0xf000) != sel) {
 416                         value &= 0x0fff;
 417                         value |= sel;
 418                 ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD,
 419                                          ACPI_SBS_MANAGER,
 420                                          0x01, (u8 *)&value, 2);
 421                 if (ret)
 422                         goto end;
 423                 }
 424         }
 425         ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD, ACPI_SBS_BATTERY,
 426                                 0x01, (u8 *)&battery->alarm_capacity, 2);
 427       end:
 428         return ret;
 429 }
 430
 431 static int acpi_ac_get_present(struct acpi_sbs *sbs)
 432 {
 433         int result;
 434         u16 status;
 435
 436         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_CHARGER,
 437                                  0x13, (u8 *) & status);
 438         if (!result)
 439                 sbs->charger_present = (status >> 15) & 0x1;
 440         return result;
 441 }
 442
 443 static ssize_t acpi_battery_alarm_show(struct device *dev,
 444                                         struct device_attribute *attr,
 445                                         char *buf)
 446 {
 447         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 448         acpi_battery_get_alarm(battery);
 449         return sprintf(buf, "%d\n", battery->alarm_capacity *
 450                                 acpi_battery_scale(battery) * 1000);
 451 }
 452
 453 static ssize_t acpi_battery_alarm_store(struct device *dev,
 454                                         struct device_attribute *attr,
 455                                         const char *buf, size_t count)
 456 {
 457         unsigned long x;
 458         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 459         if (sscanf(buf, "%ld\n", &x) == 1)
 460                 battery->alarm_capacity = x /
 461                         (1000 * acpi_battery_scale(battery));
 462         if (battery->present)
 463                 acpi_battery_set_alarm(battery);
 464         return count;
 465 }
 466
 467 static struct device_attribute alarm_attr = {
 468         .attr = {.name = "alarm", .mode = 0644},
 469         .show = acpi_battery_alarm_show,
 470         .store = acpi_battery_alarm_store,
 471 };
 472
 473 /* --------------------------------------------------------------------------
 474                               FS Interface (/proc/acpi)
 475    -------------------------------------------------------------------------- */
 476
 477 #ifdef CONFIG_ACPI_PROCFS_POWER
 478 /* Generic Routines */
 479 static int
 480 acpi_sbs_add_fs(struct proc_dir_entry **dir,
 481                 struct proc_dir_entry *parent_dir,
 482                 char *dir_name,
 483                 const struct file_operations *info_fops,
 484                 const struct file_operations *state_fops,
 485                 const struct file_operations *alarm_fops, void *data)
 486 {
 487         printk(KERN_WARNING PREFIX "Deprecated procfs I/F for SBS is loaded,"
 488                         " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
 489         if (!*dir) {
 490                 *dir = proc_mkdir(dir_name, parent_dir);
 491                 if (!*dir) {
 492                         return -ENODEV;
 493                 }
 494         }
 495
 496         /* 'info' [R] */
 497         if (info_fops)
 498                 proc_create_data(ACPI_SBS_FILE_INFO, S_IRUGO, *dir,
 499                                  info_fops, data);
 500
 501         /* 'state' [R] */
 502         if (state_fops)
 503                 proc_create_data(ACPI_SBS_FILE_STATE, S_IRUGO, *dir,
 504                                  state_fops, data);
 505
 506         /* 'alarm' [R/W] */
 507         if (alarm_fops)
 508                 proc_create_data(ACPI_SBS_FILE_ALARM, S_IRUGO, *dir,
 509                                  alarm_fops, data);
 510         return 0;
 511 }
 512
 513 static void
 514 acpi_sbs_remove_fs(struct proc_dir_entry **dir,
 515                            struct proc_dir_entry *parent_dir)
 516 {
 517         if (*dir) {
 518                 remove_proc_entry(ACPI_SBS_FILE_INFO, *dir);
 519                 remove_proc_entry(ACPI_SBS_FILE_STATE, *dir);
 520                 remove_proc_entry(ACPI_SBS_FILE_ALARM, *dir);
 521                 remove_proc_entry((*dir)->name, parent_dir);
 522                 *dir = NULL;
 523         }
 524 }
 525
 526 /* Smart Battery Interface */
 527 static struct proc_dir_entry *acpi_battery_dir = NULL;
 528
 529 static inline char *acpi_battery_units(struct acpi_battery *battery)
 530 {
 531         return acpi_battery_mode(battery) ? " mW" : " mA";
 532 }
 533
 534
 535 static int acpi_battery_read_info(struct seq_file *seq, void *offset)
 536 {
 537         struct acpi_battery *battery = seq->private;
 538         struct acpi_sbs *sbs = battery->sbs;
 539         int result = 0;
 540
 541         mutex_lock(&sbs->lock);
 542
 543         seq_printf(seq, "present:                 %s\n",
 544                    (battery->present) ? "yes" : "no");
 545         if (!battery->present)
 546                 goto end;
 547
 548         seq_printf(seq, "design capacity:         %i%sh\n",
 549                    battery->design_capacity * acpi_battery_scale(battery),
 550                    acpi_battery_units(battery));
 551         seq_printf(seq, "last full capacity:      %i%sh\n",
 552                    battery->full_charge_capacity * acpi_battery_scale(battery),
 553                    acpi_battery_units(battery));
 554         seq_printf(seq, "battery technology:      rechargeable\n");
 555         seq_printf(seq, "design voltage:          %i mV\n",
 556                    battery->design_voltage * acpi_battery_vscale(battery));
 557         seq_printf(seq, "design capacity warning: unknown\n");
 558         seq_printf(seq, "design capacity low:     unknown\n");
 559         seq_printf(seq, "cycle count:             %i\n", battery->cycle_count);
 560         seq_printf(seq, "capacity granularity 1:  unknown\n");
 561         seq_printf(seq, "capacity granularity 2:  unknown\n");
 562         seq_printf(seq, "model number:            %s\n", battery->device_name);
 563         seq_printf(seq, "serial number:           %i\n",
 564                    battery->serial_number);
 565         seq_printf(seq, "battery type:            %s\n",
 566                    battery->device_chemistry);
 567         seq_printf(seq, "OEM info:                %s\n",
 568                    battery->manufacturer_name);
 569       end:
 570         mutex_unlock(&sbs->lock);
 571         return result;
 572 }
 573
 574 static int acpi_battery_info_open_fs(struct inode *inode, struct file *file)
 575 {
 576         return single_open(file, acpi_battery_read_info, PDE(inode)->data);
 577 }
 578
 579 static int acpi_battery_read_state(struct seq_file *seq, void *offset)
 580 {
 581         struct acpi_battery *battery = seq->private;
 582         struct acpi_sbs *sbs = battery->sbs;
 583         int rate;
 584
 585         mutex_lock(&sbs->lock);
 586         seq_printf(seq, "present:                 %s\n",
 587                    (battery->present) ? "yes" : "no");
 588         if (!battery->present)
 589                 goto end;
 590
 591         acpi_battery_get_state(battery);
 592         seq_printf(seq, "capacity state:          %s\n",
 593                    (battery->state & 0x0010) ? "critical" : "ok");
 594         seq_printf(seq, "charging state:          %s\n",
 595                    (battery->rate_now < 0) ? "discharging" :
 596                    ((battery->rate_now > 0) ? "charging" : "charged"));
 597         rate = abs(battery->rate_now) * acpi_battery_ipscale(battery);
 598         rate *= (acpi_battery_mode(battery))?(battery->voltage_now *
 599                         acpi_battery_vscale(battery)/1000):1;
 600         seq_printf(seq, "present rate:            %d%s\n", rate,
 601                    acpi_battery_units(battery));
 602         seq_printf(seq, "remaining capacity:      %i%sh\n",
 603                    battery->capacity_now * acpi_battery_scale(battery),
 604                    acpi_battery_units(battery));
 605         seq_printf(seq, "present voltage:         %i mV\n",
 606                    battery->voltage_now * acpi_battery_vscale(battery));
 607
 608       end:
 609         mutex_unlock(&sbs->lock);
 610         return 0;
 611 }
 612
 613 static int acpi_battery_state_open_fs(struct inode *inode, struct file *file)
 614 {
 615         return single_open(file, acpi_battery_read_state, PDE(inode)->data);
 616 }
 617
 618 static int acpi_battery_read_alarm(struct seq_file *seq, void *offset)
 619 {
 620         struct acpi_battery *battery = seq->private;
 621         struct acpi_sbs *sbs = battery->sbs;
 622         int result = 0;
 623
 624         mutex_lock(&sbs->lock);
 625
 626         if (!battery->present) {
 627                 seq_printf(seq, "present:                 no\n");
 628                 goto end;
 629         }
 630
 631         acpi_battery_get_alarm(battery);
 632         seq_printf(seq, "alarm:                   ");
 633         if (battery->alarm_capacity)
 634                 seq_printf(seq, "%i%sh\n",
 635                            battery->alarm_capacity *
 636                            acpi_battery_scale(battery),
 637                            acpi_battery_units(battery));
 638         else
 639                 seq_printf(seq, "disabled\n");
 640       end:
 641         mutex_unlock(&sbs->lock);
 642         return result;
 643 }
 644
 645 static ssize_t
 646 acpi_battery_write_alarm(struct file *file, const char __user * buffer,
 647                          size_t count, loff_t * ppos)
 648 {
 649         struct seq_file *seq = file->private_data;
 650         struct acpi_battery *battery = seq->private;
 651         struct acpi_sbs *sbs = battery->sbs;
 652         char alarm_string[12] = { '\0' };
 653         int result = 0;
 654         mutex_lock(&sbs->lock);
 655         if (!battery->present) {
 656                 result = -ENODEV;
 657                 goto end;
 658         }
 659         if (count > sizeof(alarm_string) - 1) {
 660                 result = -EINVAL;
 661                 goto end;
 662         }
 663         if (copy_from_user(alarm_string, buffer, count)) {
 664                 result = -EFAULT;
 665                 goto end;
 666         }
 667         alarm_string[count] = 0;
 668         battery->alarm_capacity = simple_strtoul(alarm_string, NULL, 0) /
 669                                         acpi_battery_scale(battery);
 670         acpi_battery_set_alarm(battery);
 671       end:
 672         mutex_unlock(&sbs->lock);
 673         if (result)
 674                 return result;
 675         return count;
 676 }
 677
 678 static int acpi_battery_alarm_open_fs(struct inode *inode, struct file *file)
 679 {
 680         return single_open(file, acpi_battery_read_alarm, PDE(inode)->data);
 681 }
 682
 683 static const struct file_operations acpi_battery_info_fops = {
 684         .open = acpi_battery_info_open_fs,
 685         .read = seq_read,
 686         .llseek = seq_lseek,
 687         .release = single_release,
 688         .owner = THIS_MODULE,
 689 };
 690
 691 static const struct file_operations acpi_battery_state_fops = {
 692         .open = acpi_battery_state_open_fs,
 693         .read = seq_read,
 694         .llseek = seq_lseek,
 695         .release = single_release,
 696         .owner = THIS_MODULE,
 697 };
 698
 699 static const struct file_operations acpi_battery_alarm_fops = {
 700         .open = acpi_battery_alarm_open_fs,
 701         .read = seq_read,
 702         .write = acpi_battery_write_alarm,
 703         .llseek = seq_lseek,
 704         .release = single_release,
 705         .owner = THIS_MODULE,
 706 };
 707
 708 /* Legacy AC Adapter Interface */
 709
 710 static struct proc_dir_entry *acpi_ac_dir = NULL;
 711
 712 static int acpi_ac_read_state(struct seq_file *seq, void *offset)
 713 {
 714
 715         struct acpi_sbs *sbs = seq->private;
 716
 717         mutex_lock(&sbs->lock);
 718
 719         seq_printf(seq, "state:                   %s\n",
 720                    sbs->charger_present ? "on-line" : "off-line");
 721
 722         mutex_unlock(&sbs->lock);
 723         return 0;
 724 }
 725
 726 static int acpi_ac_state_open_fs(struct inode *inode, struct file *file)
 727 {
 728         return single_open(file, acpi_ac_read_state, PDE(inode)->data);
 729 }
 730
 731 static const struct file_operations acpi_ac_state_fops = {
 732         .open = acpi_ac_state_open_fs,
 733         .read = seq_read,
 734         .llseek = seq_lseek,
 735         .release = single_release,
 736         .owner = THIS_MODULE,
 737 };
 738
 739 #endif
 740
 741 /* --------------------------------------------------------------------------
 742                                  Driver Interface
 743    -------------------------------------------------------------------------- */
 744 static int acpi_battery_read(struct acpi_battery *battery)
 745 {
 746         int result = 0, saved_present = battery->present;
 747         u16 state;
 748
 749         if (battery->sbs->manager_present) {
 750                 result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
 751                                 ACPI_SBS_MANAGER, 0x01, (u8 *)&state);
 752                 if (!result)
 753                         battery->present = state & (1 << battery->id);
 754                 state &= 0x0fff;
 755                 state |= 1 << (battery->id + 12);
 756                 acpi_smbus_write(battery->sbs->hc, SMBUS_WRITE_WORD,
 757                                   ACPI_SBS_MANAGER, 0x01, (u8 *)&state, 2);
 758         } else if (battery->id == 0)
 759                 battery->present = 1;
 760         if (result || !battery->present)
 761                 return result;
 762
 763         if (saved_present != battery->present) {
 764                 battery->update_time = 0;
 765                 result = acpi_battery_get_info(battery);
 766                 if (result)
 767                         return result;
 768         }
 769         result = acpi_battery_get_state(battery);
 770         return result;
 771 }
 772
 773 /* Smart Battery */
 774 static int acpi_battery_add(struct acpi_sbs *sbs, int id)
 775 {
 776         struct acpi_battery *battery = &sbs->battery[id];
 777         int result;
 778
 779         battery->id = id;
 780         battery->sbs = sbs;
 781         result = acpi_battery_read(battery);
 782         if (result)
 783                 return result;
 784
 785         sprintf(battery->name, ACPI_BATTERY_DIR_NAME, id);
 786 #ifdef CONFIG_ACPI_PROCFS_POWER
 787         acpi_sbs_add_fs(&battery->proc_entry, acpi_battery_dir,
 788                         battery->name, &acpi_battery_info_fops,
 789                         &acpi_battery_state_fops, &acpi_battery_alarm_fops,
 790                         battery);
 791 #endif
 792         battery->bat.name = battery->name;
 793         battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
 794         if (!acpi_battery_mode(battery)) {
 795                 battery->bat.properties = sbs_charge_battery_props;
 796                 battery->bat.num_properties =
 797                     ARRAY_SIZE(sbs_charge_battery_props);
 798         } else {
 799                 battery->bat.properties = sbs_energy_battery_props;
 800                 battery->bat.num_properties =
 801                     ARRAY_SIZE(sbs_energy_battery_props);
 802         }
 803         battery->bat.get_property = acpi_sbs_battery_get_property;
 804         result = power_supply_register(&sbs->device->dev, &battery->bat);
 805         if (result)
 806                 goto end;
 807         result = device_create_file(battery->bat.dev, &alarm_attr);
 808         if (result)
 809                 goto end;
 810         battery->have_sysfs_alarm = 1;
 811       end:
 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, battery->present ? "present" : "absent");
 815         return result;
 816 }
 817
 818 static void acpi_battery_remove(struct acpi_sbs *sbs, int id)
 819 {
 820         struct acpi_battery *battery = &sbs->battery[id];
 821
 822         if (battery->bat.dev) {
 823                 if (battery->have_sysfs_alarm)
 824                         device_remove_file(battery->bat.dev, &alarm_attr);
 825                 power_supply_unregister(&battery->bat);
 826         }
 827 #ifdef CONFIG_ACPI_PROCFS_POWER
 828         if (battery->proc_entry)
 829                 acpi_sbs_remove_fs(&battery->proc_entry, acpi_battery_dir);
 830 #endif
 831 }
 832
 833 static int acpi_charger_add(struct acpi_sbs *sbs)
 834 {
 835         int result;
 836
 837         result = acpi_ac_get_present(sbs);
 838         if (result)
 839                 goto end;
 840 #ifdef CONFIG_ACPI_PROCFS_POWER
 841         result = acpi_sbs_add_fs(&sbs->charger_entry, acpi_ac_dir,
 842                                  ACPI_AC_DIR_NAME, NULL,
 843                                  &acpi_ac_state_fops, NULL, sbs);
 844         if (result)
 845                 goto end;
 846 #endif
 847         sbs->charger.name = "sbs-charger";
 848         sbs->charger.type = POWER_SUPPLY_TYPE_MAINS;
 849         sbs->charger.properties = sbs_ac_props;
 850         sbs->charger.num_properties = ARRAY_SIZE(sbs_ac_props);
 851         sbs->charger.get_property = sbs_get_ac_property;
 852         power_supply_register(&sbs->device->dev, &sbs->charger);
 853         printk(KERN_INFO PREFIX "%s [%s]: AC Adapter [%s] (%s)\n",
 854                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
 855                ACPI_AC_DIR_NAME, sbs->charger_present ? "on-line" : "off-line");
 856       end:
 857         return result;
 858 }
 859
 860 static void acpi_charger_remove(struct acpi_sbs *sbs)
 861 {
 862         if (sbs->charger.dev)
 863                 power_supply_unregister(&sbs->charger);
 864 #ifdef CONFIG_ACPI_PROCFS_POWER
 865         if (sbs->charger_entry)
 866                 acpi_sbs_remove_fs(&sbs->charger_entry, acpi_ac_dir);
 867 #endif
 868 }
 869
 870 static void acpi_sbs_callback(void *context)
 871 {
 872         int id;
 873         struct acpi_sbs *sbs = context;
 874         struct acpi_battery *bat;
 875         u8 saved_charger_state = sbs->charger_present;
 876         u8 saved_battery_state;
 877         acpi_ac_get_present(sbs);
 878         if (sbs->charger_present != saved_charger_state) {
 879 #ifdef CONFIG_ACPI_PROC_EVENT
 880                 acpi_bus_generate_proc_event4(ACPI_AC_CLASS, ACPI_AC_DIR_NAME,
 881                                               ACPI_SBS_NOTIFY_STATUS,
 882                                               sbs->charger_present);
 883 #endif
 884                 kobject_uevent(&sbs->charger.dev->kobj, KOBJ_CHANGE);
 885         }
 886         if (sbs->manager_present) {
 887                 for (id = 0; id < MAX_SBS_BAT; ++id) {
 888                         if (!(sbs->batteries_supported & (1 << id)))
 889                                 continue;
 890                         bat = &sbs->battery[id];
 891                         saved_battery_state = bat->present;
 892                         acpi_battery_read(bat);
 893                         if (saved_battery_state == bat->present)
 894                                 continue;
 895 #ifdef CONFIG_ACPI_PROC_EVENT
 896                         acpi_bus_generate_proc_event4(ACPI_BATTERY_CLASS,
 897                                                       bat->name,
 898                                                       ACPI_SBS_NOTIFY_STATUS,
 899                                                       bat->present);
 900 #endif
 901                         kobject_uevent(&bat->bat.dev->kobj, KOBJ_CHANGE);
 902                 }
 903         }
 904 }
 905
 906 static int acpi_sbs_remove(struct acpi_device *device, int type);
 907
 908 static int acpi_sbs_add(struct acpi_device *device)
 909 {
 910         struct acpi_sbs *sbs;
 911         int result = 0;
 912         int id;
 913
 914         sbs = kzalloc(sizeof(struct acpi_sbs), GFP_KERNEL);
 915         if (!sbs) {
 916                 result = -ENOMEM;
 917                 goto end;
 918         }
 919
 920         mutex_init(&sbs->lock);
 921
 922         sbs->hc = acpi_driver_data(device->parent);
 923         sbs->device = device;
 924         strcpy(acpi_device_name(device), ACPI_SBS_DEVICE_NAME);
 925         strcpy(acpi_device_class(device), ACPI_SBS_CLASS);
 926         device->driver_data = sbs;
 927
 928         result = acpi_charger_add(sbs);
 929         if (result)
 930                 goto end;
 931
 932         result = acpi_manager_get_info(sbs);
 933         if (!result) {
 934                 sbs->manager_present = 1;
 935                 for (id = 0; id < MAX_SBS_BAT; ++id)
 936                         if ((sbs->batteries_supported & (1 << id)))
 937                                 acpi_battery_add(sbs, id);
 938         } else
 939                 acpi_battery_add(sbs, 0);
 940         acpi_smbus_register_callback(sbs->hc, acpi_sbs_callback, sbs);
 941       end:
 942         if (result)
 943                 acpi_sbs_remove(device, 0);
 944         return result;
 945 }
 946
 947 static int acpi_sbs_remove(struct acpi_device *device, int type)
 948 {
 949         struct acpi_sbs *sbs;
 950         int id;
 951
 952         if (!device)
 953                 return -EINVAL;
 954         sbs = acpi_driver_data(device);
 955         if (!sbs)
 956                 return -EINVAL;
 957         mutex_lock(&sbs->lock);
 958         acpi_smbus_unregister_callback(sbs->hc);
 959         for (id = 0; id < MAX_SBS_BAT; ++id)
 960                 acpi_battery_remove(sbs, id);
 961         acpi_charger_remove(sbs);
 962         mutex_unlock(&sbs->lock);
 963         mutex_destroy(&sbs->lock);
 964         kfree(sbs);
 965         return 0;
 966 }
 967
 968 static void acpi_sbs_rmdirs(void)
 969 {
 970 #ifdef CONFIG_ACPI_PROCFS_POWER
 971         if (acpi_ac_dir) {
 972                 acpi_unlock_ac_dir(acpi_ac_dir);
 973                 acpi_ac_dir = NULL;
 974         }
 975         if (acpi_battery_dir) {
 976                 acpi_unlock_battery_dir(acpi_battery_dir);
 977                 acpi_battery_dir = NULL;
 978         }
 979 #endif
 980 }
 981
 982 static int acpi_sbs_resume(struct acpi_device *device)
 983 {
 984         struct acpi_sbs *sbs;
 985         if (!device)
 986                 return -EINVAL;
 987         sbs = device->driver_data;
 988         acpi_sbs_callback(sbs);
 989         return 0;
 990 }
 991
 992 static struct acpi_driver acpi_sbs_driver = {
 993         .name = "sbs",
 994         .class = ACPI_SBS_CLASS,
 995         .ids = sbs_device_ids,
 996         .ops = {
 997                 .add = acpi_sbs_add,
 998                 .remove = acpi_sbs_remove,
 999                 .resume = acpi_sbs_resume,
1000                 },
1001 };
1002
1003 static int __init acpi_sbs_init(void)
1004 {
1005         int result = 0;
1006
1007         if (acpi_disabled)
1008                 return -ENODEV;
1009 #ifdef CONFIG_ACPI_PROCFS_POWER
1010         acpi_ac_dir = acpi_lock_ac_dir();
1011         if (!acpi_ac_dir)
1012                 return -ENODEV;
1013         acpi_battery_dir = acpi_lock_battery_dir();
1014         if (!acpi_battery_dir) {
1015                 acpi_sbs_rmdirs();
1016                 return -ENODEV;
1017         }
1018 #endif
1019         result = acpi_bus_register_driver(&acpi_sbs_driver);
1020         if (result < 0) {
1021                 acpi_sbs_rmdirs();
1022                 return -ENODEV;
1023         }
1024         return 0;
1025 }
1026
1027 static void __exit acpi_sbs_exit(void)
1028 {
1029         acpi_bus_unregister_driver(&acpi_sbs_driver);
1030         acpi_sbs_rmdirs();
1031         return;
1032 }
1033
1034 module_init(acpi_sbs_init);
1035 module_exit(acpi_sbs_exit);