linux/drivers/acpi/sbs.c
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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/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
  62MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
  63MODULE_DESCRIPTION("Smart Battery System ACPI interface driver");
  64MODULE_LICENSE("GPL");
  65
  66static unsigned int cache_time = 1000;
  67module_param(cache_time, uint, 0644);
  68MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
  69
  70extern struct proc_dir_entry *acpi_lock_ac_dir(void);
  71extern struct proc_dir_entry *acpi_lock_battery_dir(void);
  72extern void acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
  73extern 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
  78static const struct acpi_device_id sbs_device_ids[] = {
  79        {"ACPI0002", 0},
  80        {"", 0},
  81};
  82MODULE_DEVICE_TABLE(acpi, sbs_device_ids);
  83
  84struct 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
 117struct 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
 133static int acpi_sbs_remove(struct acpi_device *device);
 134static int acpi_battery_get_state(struct acpi_battery *battery);
 135
 136static inline int battery_scale(int log)
 137{
 138        int scale = 1;
 139        while (log--)
 140                scale *= 10;
 141        return scale;
 142}
 143
 144static inline int acpi_battery_vscale(struct acpi_battery *battery)
 145{
 146        return battery_scale((battery->spec & 0x0f00) >> 8);
 147}
 148
 149static inline int acpi_battery_ipscale(struct acpi_battery *battery)
 150{
 151        return battery_scale((battery->spec & 0xf000) >> 12);
 152}
 153
 154static inline int acpi_battery_mode(struct acpi_battery *battery)
 155{
 156        return (battery->mode & 0x8000);
 157}
 158
 159static 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
 165static 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
 180static 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
 193static int acpi_sbs_battery_get_property(struct power_supply *psy,
 194                                         enum power_supply_property psp,
 195                                         union power_supply_propval *val)
 196{
 197        struct acpi_battery *battery = to_acpi_battery(psy);
 198
 199        if ((!battery->present) && psp != POWER_SUPPLY_PROP_PRESENT)
 200                return -ENODEV;
 201
 202        acpi_battery_get_state(battery);
 203        switch (psp) {
 204        case POWER_SUPPLY_PROP_STATUS:
 205                if (battery->rate_now < 0)
 206                        val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 207                else if (battery->rate_now > 0)
 208                        val->intval = POWER_SUPPLY_STATUS_CHARGING;
 209                else
 210                        val->intval = POWER_SUPPLY_STATUS_FULL;
 211                break;
 212        case POWER_SUPPLY_PROP_PRESENT:
 213                val->intval = battery->present;
 214                break;
 215        case POWER_SUPPLY_PROP_TECHNOLOGY:
 216                val->intval = acpi_battery_technology(battery);
 217                break;
 218        case POWER_SUPPLY_PROP_CYCLE_COUNT:
 219                val->intval = battery->cycle_count;
 220                break;
 221        case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 222                val->intval = battery->design_voltage *
 223                        acpi_battery_vscale(battery) * 1000;
 224                break;
 225        case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 226                val->intval = battery->voltage_now *
 227                                acpi_battery_vscale(battery) * 1000;
 228                break;
 229        case POWER_SUPPLY_PROP_CURRENT_NOW:
 230        case POWER_SUPPLY_PROP_POWER_NOW:
 231                val->intval = abs(battery->rate_now) *
 232                                acpi_battery_ipscale(battery) * 1000;
 233                val->intval *= (acpi_battery_mode(battery)) ?
 234                                (battery->voltage_now *
 235                                acpi_battery_vscale(battery) / 1000) : 1;
 236                break;
 237        case POWER_SUPPLY_PROP_CURRENT_AVG:
 238        case POWER_SUPPLY_PROP_POWER_AVG:
 239                val->intval = abs(battery->rate_avg) *
 240                                acpi_battery_ipscale(battery) * 1000;
 241                val->intval *= (acpi_battery_mode(battery)) ?
 242                                (battery->voltage_now *
 243                                acpi_battery_vscale(battery) / 1000) : 1;
 244                break;
 245        case POWER_SUPPLY_PROP_CAPACITY:
 246                val->intval = battery->state_of_charge;
 247                break;
 248        case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 249        case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 250                val->intval = battery->design_capacity *
 251                        acpi_battery_scale(battery) * 1000;
 252                break;
 253        case POWER_SUPPLY_PROP_CHARGE_FULL:
 254        case POWER_SUPPLY_PROP_ENERGY_FULL:
 255                val->intval = battery->full_charge_capacity *
 256                        acpi_battery_scale(battery) * 1000;
 257                break;
 258        case POWER_SUPPLY_PROP_CHARGE_NOW:
 259        case POWER_SUPPLY_PROP_ENERGY_NOW:
 260                val->intval = battery->capacity_now *
 261                                acpi_battery_scale(battery) * 1000;
 262                break;
 263        case POWER_SUPPLY_PROP_TEMP:
 264                val->intval = battery->temp_now - 2730; // dK -> dC
 265                break;
 266        case POWER_SUPPLY_PROP_MODEL_NAME:
 267                val->strval = battery->device_name;
 268                break;
 269        case POWER_SUPPLY_PROP_MANUFACTURER:
 270                val->strval = battery->manufacturer_name;
 271                break;
 272        default:
 273                return -EINVAL;
 274        }
 275        return 0;
 276}
 277
 278static enum power_supply_property sbs_ac_props[] = {
 279        POWER_SUPPLY_PROP_ONLINE,
 280};
 281
 282static enum power_supply_property sbs_charge_battery_props[] = {
 283        POWER_SUPPLY_PROP_STATUS,
 284        POWER_SUPPLY_PROP_PRESENT,
 285        POWER_SUPPLY_PROP_TECHNOLOGY,
 286        POWER_SUPPLY_PROP_CYCLE_COUNT,
 287        POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 288        POWER_SUPPLY_PROP_VOLTAGE_NOW,
 289        POWER_SUPPLY_PROP_CURRENT_NOW,
 290        POWER_SUPPLY_PROP_CURRENT_AVG,
 291        POWER_SUPPLY_PROP_CAPACITY,
 292        POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 293        POWER_SUPPLY_PROP_CHARGE_FULL,
 294        POWER_SUPPLY_PROP_CHARGE_NOW,
 295        POWER_SUPPLY_PROP_TEMP,
 296        POWER_SUPPLY_PROP_MODEL_NAME,
 297        POWER_SUPPLY_PROP_MANUFACTURER,
 298};
 299
 300static enum power_supply_property sbs_energy_battery_props[] = {
 301        POWER_SUPPLY_PROP_STATUS,
 302        POWER_SUPPLY_PROP_PRESENT,
 303        POWER_SUPPLY_PROP_TECHNOLOGY,
 304        POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 305        POWER_SUPPLY_PROP_VOLTAGE_NOW,
 306        POWER_SUPPLY_PROP_CURRENT_NOW,
 307        POWER_SUPPLY_PROP_CURRENT_AVG,
 308        POWER_SUPPLY_PROP_POWER_NOW,
 309        POWER_SUPPLY_PROP_POWER_AVG,
 310        POWER_SUPPLY_PROP_CAPACITY,
 311        POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 312        POWER_SUPPLY_PROP_ENERGY_FULL,
 313        POWER_SUPPLY_PROP_ENERGY_NOW,
 314        POWER_SUPPLY_PROP_TEMP,
 315        POWER_SUPPLY_PROP_MODEL_NAME,
 316        POWER_SUPPLY_PROP_MANUFACTURER,
 317};
 318
 319
 320/* --------------------------------------------------------------------------
 321                            Smart Battery System Management
 322   -------------------------------------------------------------------------- */
 323
 324struct acpi_battery_reader {
 325        u8 command;             /* command for battery */
 326        u8 mode;                /* word or block? */
 327        size_t offset;          /* offset inside struct acpi_sbs_battery */
 328};
 329
 330static struct acpi_battery_reader info_readers[] = {
 331        {0x01, SMBUS_READ_WORD, offsetof(struct acpi_battery, alarm_capacity)},
 332        {0x03, SMBUS_READ_WORD, offsetof(struct acpi_battery, mode)},
 333        {0x10, SMBUS_READ_WORD, offsetof(struct acpi_battery, full_charge_capacity)},
 334        {0x17, SMBUS_READ_WORD, offsetof(struct acpi_battery, cycle_count)},
 335        {0x18, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_capacity)},
 336        {0x19, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_voltage)},
 337        {0x1a, SMBUS_READ_WORD, offsetof(struct acpi_battery, spec)},
 338        {0x1c, SMBUS_READ_WORD, offsetof(struct acpi_battery, serial_number)},
 339        {0x20, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, manufacturer_name)},
 340        {0x21, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_name)},
 341        {0x22, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_chemistry)},
 342};
 343
 344static struct acpi_battery_reader state_readers[] = {
 345        {0x08, SMBUS_READ_WORD, offsetof(struct acpi_battery, temp_now)},
 346        {0x09, SMBUS_READ_WORD, offsetof(struct acpi_battery, voltage_now)},
 347        {0x0a, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_now)},
 348        {0x0b, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_avg)},
 349        {0x0f, SMBUS_READ_WORD, offsetof(struct acpi_battery, capacity_now)},
 350        {0x0e, SMBUS_READ_WORD, offsetof(struct acpi_battery, state_of_charge)},
 351        {0x16, SMBUS_READ_WORD, offsetof(struct acpi_battery, state)},
 352};
 353
 354static int acpi_manager_get_info(struct acpi_sbs *sbs)
 355{
 356        int result = 0;
 357        u16 battery_system_info;
 358
 359        result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
 360                                 0x04, (u8 *)&battery_system_info);
 361        if (!result)
 362                sbs->batteries_supported = battery_system_info & 0x000f;
 363        return result;
 364}
 365
 366static int acpi_battery_get_info(struct acpi_battery *battery)
 367{
 368        int i, result = 0;
 369
 370        for (i = 0; i < ARRAY_SIZE(info_readers); ++i) {
 371                result = acpi_smbus_read(battery->sbs->hc,
 372                                         info_readers[i].mode,
 373                                         ACPI_SBS_BATTERY,
 374                                         info_readers[i].command,
 375                                         (u8 *) battery +
 376                                                info_readers[i].offset);
 377                if (result)
 378                        break;
 379        }
 380        return result;
 381}
 382
 383static int acpi_battery_get_state(struct acpi_battery *battery)
 384{
 385        int i, result = 0;
 386
 387        if (battery->update_time &&
 388            time_before(jiffies, battery->update_time +
 389                                msecs_to_jiffies(cache_time)))
 390                return 0;
 391        for (i = 0; i < ARRAY_SIZE(state_readers); ++i) {
 392                result = acpi_smbus_read(battery->sbs->hc,
 393                                         state_readers[i].mode,
 394                                         ACPI_SBS_BATTERY,
 395                                         state_readers[i].command,
 396                                         (u8 *)battery +
 397                                                state_readers[i].offset);
 398                if (result)
 399                        goto end;
 400        }
 401      end:
 402        battery->update_time = jiffies;
 403        return result;
 404}
 405
 406static int acpi_battery_get_alarm(struct acpi_battery *battery)
 407{
 408        return acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
 409                                 ACPI_SBS_BATTERY, 0x01,
 410                                 (u8 *)&battery->alarm_capacity);
 411}
 412
 413static int acpi_battery_set_alarm(struct acpi_battery *battery)
 414{
 415        struct acpi_sbs *sbs = battery->sbs;
 416        u16 value, sel = 1 << (battery->id + 12);
 417
 418        int ret;
 419
 420
 421        if (sbs->manager_present) {
 422                ret = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
 423                                0x01, (u8 *)&value);
 424                if (ret)
 425                        goto end;
 426                if ((value & 0xf000) != sel) {
 427                        value &= 0x0fff;
 428                        value |= sel;
 429                ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD,
 430                                         ACPI_SBS_MANAGER,
 431                                         0x01, (u8 *)&value, 2);
 432                if (ret)
 433                        goto end;
 434                }
 435        }
 436        ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD, ACPI_SBS_BATTERY,
 437                                0x01, (u8 *)&battery->alarm_capacity, 2);
 438      end:
 439        return ret;
 440}
 441
 442static int acpi_ac_get_present(struct acpi_sbs *sbs)
 443{
 444        int result;
 445        u16 status;
 446
 447        result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_CHARGER,
 448                                 0x13, (u8 *) & status);
 449        if (!result)
 450                sbs->charger_present = (status >> 15) & 0x1;
 451        return result;
 452}
 453
 454static ssize_t acpi_battery_alarm_show(struct device *dev,
 455                                        struct device_attribute *attr,
 456                                        char *buf)
 457{
 458        struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 459        acpi_battery_get_alarm(battery);
 460        return sprintf(buf, "%d\n", battery->alarm_capacity *
 461                                acpi_battery_scale(battery) * 1000);
 462}
 463
 464static ssize_t acpi_battery_alarm_store(struct device *dev,
 465                                        struct device_attribute *attr,
 466                                        const char *buf, size_t count)
 467{
 468        unsigned long x;
 469        struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 470        if (sscanf(buf, "%ld\n", &x) == 1)
 471                battery->alarm_capacity = x /
 472                        (1000 * acpi_battery_scale(battery));
 473        if (battery->present)
 474                acpi_battery_set_alarm(battery);
 475        return count;
 476}
 477
 478static struct device_attribute alarm_attr = {
 479        .attr = {.name = "alarm", .mode = 0644},
 480        .show = acpi_battery_alarm_show,
 481        .store = acpi_battery_alarm_store,
 482};
 483
 484/* --------------------------------------------------------------------------
 485                              FS Interface (/proc/acpi)
 486   -------------------------------------------------------------------------- */
 487
 488#ifdef CONFIG_ACPI_PROCFS_POWER
 489/* Generic Routines */
 490static int
 491acpi_sbs_add_fs(struct proc_dir_entry **dir,
 492                struct proc_dir_entry *parent_dir,
 493                char *dir_name,
 494                const struct file_operations *info_fops,
 495                const struct file_operations *state_fops,
 496                const struct file_operations *alarm_fops, void *data)
 497{
 498        printk(KERN_WARNING PREFIX "Deprecated procfs I/F for SBS is loaded,"
 499                        " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
 500        if (!*dir) {
 501                *dir = proc_mkdir(dir_name, parent_dir);
 502                if (!*dir) {
 503                        return -ENODEV;
 504                }
 505        }
 506
 507        /* 'info' [R] */
 508        if (info_fops)
 509                proc_create_data(ACPI_SBS_FILE_INFO, S_IRUGO, *dir,
 510                                 info_fops, data);
 511
 512        /* 'state' [R] */
 513        if (state_fops)
 514                proc_create_data(ACPI_SBS_FILE_STATE, S_IRUGO, *dir,
 515                                 state_fops, data);
 516
 517        /* 'alarm' [R/W] */
 518        if (alarm_fops)
 519                proc_create_data(ACPI_SBS_FILE_ALARM, S_IRUGO, *dir,
 520                                 alarm_fops, data);
 521        return 0;
 522}
 523
 524/* Smart Battery Interface */
 525static struct proc_dir_entry *acpi_battery_dir = NULL;
 526
 527static inline char *acpi_battery_units(struct acpi_battery *battery)
 528{
 529        return acpi_battery_mode(battery) ? " mW" : " mA";
 530}
 531
 532
 533static int acpi_battery_read_info(struct seq_file *seq, void *offset)
 534{
 535        struct acpi_battery *battery = seq->private;
 536        struct acpi_sbs *sbs = battery->sbs;
 537        int result = 0;
 538
 539        mutex_lock(&sbs->lock);
 540
 541        seq_printf(seq, "present:                 %s\n",
 542                   (battery->present) ? "yes" : "no");
 543        if (!battery->present)
 544                goto end;
 545
 546        seq_printf(seq, "design capacity:         %i%sh\n",
 547                   battery->design_capacity * acpi_battery_scale(battery),
 548                   acpi_battery_units(battery));
 549        seq_printf(seq, "last full capacity:      %i%sh\n",
 550                   battery->full_charge_capacity * acpi_battery_scale(battery),
 551                   acpi_battery_units(battery));
 552        seq_printf(seq, "battery technology:      rechargeable\n");
 553        seq_printf(seq, "design voltage:          %i mV\n",
 554                   battery->design_voltage * acpi_battery_vscale(battery));
 555        seq_printf(seq, "design capacity warning: unknown\n");
 556        seq_printf(seq, "design capacity low:     unknown\n");
 557        seq_printf(seq, "cycle count:             %i\n", battery->cycle_count);
 558        seq_printf(seq, "capacity granularity 1:  unknown\n");
 559        seq_printf(seq, "capacity granularity 2:  unknown\n");
 560        seq_printf(seq, "model number:            %s\n", battery->device_name);
 561        seq_printf(seq, "serial number:           %i\n",
 562                   battery->serial_number);
 563        seq_printf(seq, "battery type:            %s\n",
 564                   battery->device_chemistry);
 565        seq_printf(seq, "OEM info:                %s\n",
 566                   battery->manufacturer_name);
 567      end:
 568        mutex_unlock(&sbs->lock);
 569        return result;
 570}
 571
 572static int acpi_battery_info_open_fs(struct inode *inode, struct file *file)
 573{
 574        return single_open(file, acpi_battery_read_info, PDE_DATA(inode));
 575}
 576
 577static int acpi_battery_read_state(struct seq_file *seq, void *offset)
 578{
 579        struct acpi_battery *battery = seq->private;
 580        struct acpi_sbs *sbs = battery->sbs;
 581        int rate;
 582
 583        mutex_lock(&sbs->lock);
 584        seq_printf(seq, "present:                 %s\n",
 585                   (battery->present) ? "yes" : "no");
 586        if (!battery->present)
 587                goto end;
 588
 589        acpi_battery_get_state(battery);
 590        seq_printf(seq, "capacity state:          %s\n",
 591                   (battery->state & 0x0010) ? "critical" : "ok");
 592        seq_printf(seq, "charging state:          %s\n",
 593                   (battery->rate_now < 0) ? "discharging" :
 594                   ((battery->rate_now > 0) ? "charging" : "charged"));
 595        rate = abs(battery->rate_now) * acpi_battery_ipscale(battery);
 596        rate *= (acpi_battery_mode(battery))?(battery->voltage_now *
 597                        acpi_battery_vscale(battery)/1000):1;
 598        seq_printf(seq, "present rate:            %d%s\n", rate,
 599                   acpi_battery_units(battery));
 600        seq_printf(seq, "remaining capacity:      %i%sh\n",
 601                   battery->capacity_now * acpi_battery_scale(battery),
 602                   acpi_battery_units(battery));
 603        seq_printf(seq, "present voltage:         %i mV\n",
 604                   battery->voltage_now * acpi_battery_vscale(battery));
 605
 606      end:
 607        mutex_unlock(&sbs->lock);
 608        return 0;
 609}
 610
 611static int acpi_battery_state_open_fs(struct inode *inode, struct file *file)
 612{
 613        return single_open(file, acpi_battery_read_state, PDE_DATA(inode));
 614}
 615
 616static int acpi_battery_read_alarm(struct seq_file *seq, void *offset)
 617{
 618        struct acpi_battery *battery = seq->private;
 619        struct acpi_sbs *sbs = battery->sbs;
 620        int result = 0;
 621
 622        mutex_lock(&sbs->lock);
 623
 624        if (!battery->present) {
 625                seq_printf(seq, "present:                 no\n");
 626                goto end;
 627        }
 628
 629        acpi_battery_get_alarm(battery);
 630        seq_printf(seq, "alarm:                   ");
 631        if (battery->alarm_capacity)
 632                seq_printf(seq, "%i%sh\n",
 633                           battery->alarm_capacity *
 634                           acpi_battery_scale(battery),
 635                           acpi_battery_units(battery));
 636        else
 637                seq_printf(seq, "disabled\n");
 638      end:
 639        mutex_unlock(&sbs->lock);
 640        return result;
 641}
 642
 643static ssize_t
 644acpi_battery_write_alarm(struct file *file, const char __user * buffer,
 645                         size_t count, loff_t * ppos)
 646{
 647        struct seq_file *seq = file->private_data;
 648        struct acpi_battery *battery = seq->private;
 649        struct acpi_sbs *sbs = battery->sbs;
 650        char alarm_string[12] = { '\0' };
 651        int result = 0;
 652        mutex_lock(&sbs->lock);
 653        if (!battery->present) {
 654                result = -ENODEV;
 655                goto end;
 656        }
 657        if (count > sizeof(alarm_string) - 1) {
 658                result = -EINVAL;
 659                goto end;
 660        }
 661        if (copy_from_user(alarm_string, buffer, count)) {
 662                result = -EFAULT;
 663                goto end;
 664        }
 665        alarm_string[count] = 0;
 666        battery->alarm_capacity = simple_strtoul(alarm_string, NULL, 0) /
 667                                        acpi_battery_scale(battery);
 668        acpi_battery_set_alarm(battery);
 669      end:
 670        mutex_unlock(&sbs->lock);
 671        if (result)
 672                return result;
 673        return count;
 674}
 675
 676static int acpi_battery_alarm_open_fs(struct inode *inode, struct file *file)
 677{
 678        return single_open(file, acpi_battery_read_alarm, PDE_DATA(inode));
 679}
 680
 681static const struct file_operations acpi_battery_info_fops = {
 682        .open = acpi_battery_info_open_fs,
 683        .read = seq_read,
 684        .llseek = seq_lseek,
 685        .release = single_release,
 686        .owner = THIS_MODULE,
 687};
 688
 689static const struct file_operations acpi_battery_state_fops = {
 690        .open = acpi_battery_state_open_fs,
 691        .read = seq_read,
 692        .llseek = seq_lseek,
 693        .release = single_release,
 694        .owner = THIS_MODULE,
 695};
 696
 697static const struct file_operations acpi_battery_alarm_fops = {
 698        .open = acpi_battery_alarm_open_fs,
 699        .read = seq_read,
 700        .write = acpi_battery_write_alarm,
 701        .llseek = seq_lseek,
 702        .release = single_release,
 703        .owner = THIS_MODULE,
 704};
 705
 706/* Legacy AC Adapter Interface */
 707
 708static struct proc_dir_entry *acpi_ac_dir = NULL;
 709
 710static int acpi_ac_read_state(struct seq_file *seq, void *offset)
 711{
 712
 713        struct acpi_sbs *sbs = seq->private;
 714
 715        mutex_lock(&sbs->lock);
 716
 717        seq_printf(seq, "state:                   %s\n",
 718                   sbs->charger_present ? "on-line" : "off-line");
 719
 720        mutex_unlock(&sbs->lock);
 721        return 0;
 722}
 723
 724static int acpi_ac_state_open_fs(struct inode *inode, struct file *file)
 725{
 726        return single_open(file, acpi_ac_read_state, PDE_DATA(inode));
 727}
 728
 729static const struct file_operations acpi_ac_state_fops = {
 730        .open = acpi_ac_state_open_fs,
 731        .read = seq_read,
 732        .llseek = seq_lseek,
 733        .release = single_release,
 734        .owner = THIS_MODULE,
 735};
 736
 737#endif
 738
 739/* --------------------------------------------------------------------------
 740                                 Driver Interface
 741   -------------------------------------------------------------------------- */
 742static int acpi_battery_read(struct acpi_battery *battery)
 743{
 744        int result = 0, saved_present = battery->present;
 745        u16 state;
 746
 747        if (battery->sbs->manager_present) {
 748                result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
 749                                ACPI_SBS_MANAGER, 0x01, (u8 *)&state);
 750                if (!result)
 751                        battery->present = state & (1 << battery->id);
 752                state &= 0x0fff;
 753                state |= 1 << (battery->id + 12);
 754                acpi_smbus_write(battery->sbs->hc, SMBUS_WRITE_WORD,
 755                                  ACPI_SBS_MANAGER, 0x01, (u8 *)&state, 2);
 756        } else if (battery->id == 0)
 757                battery->present = 1;
 758        if (result || !battery->present)
 759                return result;
 760
 761        if (saved_present != battery->present) {
 762                battery->update_time = 0;
 763                result = acpi_battery_get_info(battery);
 764                if (result)
 765                        return result;
 766        }
 767        result = acpi_battery_get_state(battery);
 768        return result;
 769}
 770
 771/* Smart Battery */
 772static int acpi_battery_add(struct acpi_sbs *sbs, int id)
 773{
 774        struct acpi_battery *battery = &sbs->battery[id];
 775        int result;
 776
 777        battery->id = id;
 778        battery->sbs = sbs;
 779        result = acpi_battery_read(battery);
 780        if (result)
 781                return result;
 782
 783        sprintf(battery->name, ACPI_BATTERY_DIR_NAME, id);
 784#ifdef CONFIG_ACPI_PROCFS_POWER
 785        acpi_sbs_add_fs(&battery->proc_entry, acpi_battery_dir,
 786                        battery->name, &acpi_battery_info_fops,
 787                        &acpi_battery_state_fops, &acpi_battery_alarm_fops,
 788                        battery);
 789#endif
 790        battery->bat.name = battery->name;
 791        battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
 792        if (!acpi_battery_mode(battery)) {
 793                battery->bat.properties = sbs_charge_battery_props;
 794                battery->bat.num_properties =
 795                    ARRAY_SIZE(sbs_charge_battery_props);
 796        } else {
 797                battery->bat.properties = sbs_energy_battery_props;
 798                battery->bat.num_properties =
 799                    ARRAY_SIZE(sbs_energy_battery_props);
 800        }
 801        battery->bat.get_property = acpi_sbs_battery_get_property;
 802        result = power_supply_register(&sbs->device->dev, &battery->bat);
 803        if (result)
 804                goto end;
 805        result = device_create_file(battery->bat.dev, &alarm_attr);
 806        if (result)
 807                goto end;
 808        battery->have_sysfs_alarm = 1;
 809      end:
 810        printk(KERN_INFO PREFIX "%s [%s]: Battery Slot [%s] (battery %s)\n",
 811               ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
 812               battery->name, battery->present ? "present" : "absent");
 813        return result;
 814}
 815
 816static void acpi_battery_remove(struct acpi_sbs *sbs, int id)
 817{
 818        struct acpi_battery *battery = &sbs->battery[id];
 819
 820        if (battery->bat.dev) {
 821                if (battery->have_sysfs_alarm)
 822                        device_remove_file(battery->bat.dev, &alarm_attr);
 823                power_supply_unregister(&battery->bat);
 824        }
 825#ifdef CONFIG_ACPI_PROCFS_POWER
 826        proc_remove(battery->proc_entry);
 827        battery->proc_entry = NULL;
 828#endif
 829}
 830
 831static 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_POWER
 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
 858static 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_POWER
 863        proc_remove(sbs->charger_entry);
 864        sbs->charger_entry = NULL;
 865#endif
 866}
 867
 868static 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                kobject_uevent(&sbs->charger.dev->kobj, KOBJ_CHANGE);
 878
 879        if (sbs->manager_present) {
 880                for (id = 0; id < MAX_SBS_BAT; ++id) {
 881                        if (!(sbs->batteries_supported & (1 << id)))
 882                                continue;
 883                        bat = &sbs->battery[id];
 884                        saved_battery_state = bat->present;
 885                        acpi_battery_read(bat);
 886                        if (saved_battery_state == bat->present)
 887                                continue;
 888                        kobject_uevent(&bat->bat.dev->kobj, KOBJ_CHANGE);
 889                }
 890        }
 891}
 892
 893static int acpi_sbs_add(struct acpi_device *device)
 894{
 895        struct acpi_sbs *sbs;
 896        int result = 0;
 897        int id;
 898
 899        sbs = kzalloc(sizeof(struct acpi_sbs), GFP_KERNEL);
 900        if (!sbs) {
 901                result = -ENOMEM;
 902                goto end;
 903        }
 904
 905        mutex_init(&sbs->lock);
 906
 907        sbs->hc = acpi_driver_data(device->parent);
 908        sbs->device = device;
 909        strcpy(acpi_device_name(device), ACPI_SBS_DEVICE_NAME);
 910        strcpy(acpi_device_class(device), ACPI_SBS_CLASS);
 911        device->driver_data = sbs;
 912
 913        result = acpi_charger_add(sbs);
 914        if (result)
 915                goto end;
 916
 917        result = acpi_manager_get_info(sbs);
 918        if (!result) {
 919                sbs->manager_present = 1;
 920                for (id = 0; id < MAX_SBS_BAT; ++id)
 921                        if ((sbs->batteries_supported & (1 << id)))
 922                                acpi_battery_add(sbs, id);
 923        } else
 924                acpi_battery_add(sbs, 0);
 925        acpi_smbus_register_callback(sbs->hc, acpi_sbs_callback, sbs);
 926      end:
 927        if (result)
 928                acpi_sbs_remove(device);
 929        return result;
 930}
 931
 932static int acpi_sbs_remove(struct acpi_device *device)
 933{
 934        struct acpi_sbs *sbs;
 935        int id;
 936
 937        if (!device)
 938                return -EINVAL;
 939        sbs = acpi_driver_data(device);
 940        if (!sbs)
 941                return -EINVAL;
 942        mutex_lock(&sbs->lock);
 943        acpi_smbus_unregister_callback(sbs->hc);
 944        for (id = 0; id < MAX_SBS_BAT; ++id)
 945                acpi_battery_remove(sbs, id);
 946        acpi_charger_remove(sbs);
 947        mutex_unlock(&sbs->lock);
 948        mutex_destroy(&sbs->lock);
 949        kfree(sbs);
 950        return 0;
 951}
 952
 953static void acpi_sbs_rmdirs(void)
 954{
 955#ifdef CONFIG_ACPI_PROCFS_POWER
 956        if (acpi_ac_dir) {
 957                acpi_unlock_ac_dir(acpi_ac_dir);
 958                acpi_ac_dir = NULL;
 959        }
 960        if (acpi_battery_dir) {
 961                acpi_unlock_battery_dir(acpi_battery_dir);
 962                acpi_battery_dir = NULL;
 963        }
 964#endif
 965}
 966
 967#ifdef CONFIG_PM_SLEEP
 968static int acpi_sbs_resume(struct device *dev)
 969{
 970        struct acpi_sbs *sbs;
 971        if (!dev)
 972                return -EINVAL;
 973        sbs = to_acpi_device(dev)->driver_data;
 974        acpi_sbs_callback(sbs);
 975        return 0;
 976}
 977#endif
 978
 979static SIMPLE_DEV_PM_OPS(acpi_sbs_pm, NULL, acpi_sbs_resume);
 980
 981static struct acpi_driver acpi_sbs_driver = {
 982        .name = "sbs",
 983        .class = ACPI_SBS_CLASS,
 984        .ids = sbs_device_ids,
 985        .ops = {
 986                .add = acpi_sbs_add,
 987                .remove = acpi_sbs_remove,
 988                },
 989        .drv.pm = &acpi_sbs_pm,
 990};
 991
 992static int __init acpi_sbs_init(void)
 993{
 994        int result = 0;
 995
 996        if (acpi_disabled)
 997                return -ENODEV;
 998#ifdef CONFIG_ACPI_PROCFS_POWER
 999        acpi_ac_dir = acpi_lock_ac_dir();
1000        if (!acpi_ac_dir)
1001                return -ENODEV;
1002        acpi_battery_dir = acpi_lock_battery_dir();
1003        if (!acpi_battery_dir) {
1004                acpi_sbs_rmdirs();
1005                return -ENODEV;
1006        }
1007#endif
1008        result = acpi_bus_register_driver(&acpi_sbs_driver);
1009        if (result < 0) {
1010                acpi_sbs_rmdirs();
1011                return -ENODEV;
1012        }
1013        return 0;
1014}
1015
1016static void __exit acpi_sbs_exit(void)
1017{
1018        acpi_bus_unregister_driver(&acpi_sbs_driver);
1019        acpi_sbs_rmdirs();
1020        return;
1021}
1022
1023module_init(acpi_sbs_init);
1024module_exit(acpi_sbs_exit);
1025
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