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battery.c

/*
 *  battery.c - ACPI Battery Driver (Revision: 2.0)
 *
 *  Copyright (C) 2007 Alexey Starikovskiy <astarikovskiy@suse.de>
 *  Copyright (C) 2004-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com>
 *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or (at
 *  your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/jiffies.h>

#ifdef CONFIG_ACPI_PROCFS_POWER
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <asm/uaccess.h>
#endif

#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>

#ifdef CONFIG_ACPI_SYSFS_POWER
#include <linux/power_supply.h>
#endif

#define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF

#define ACPI_BATTERY_COMPONENT            0x00040000
#define ACPI_BATTERY_CLASS          "battery"
#define ACPI_BATTERY_DEVICE_NAME    "Battery"
#define ACPI_BATTERY_NOTIFY_STATUS  0x80
#define ACPI_BATTERY_NOTIFY_INFO    0x81

#define _COMPONENT            ACPI_BATTERY_COMPONENT

ACPI_MODULE_NAME("battery");

MODULE_AUTHOR("Paul Diefenbaugh");
MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
MODULE_DESCRIPTION("ACPI Battery Driver");
MODULE_LICENSE("GPL");

static unsigned int cache_time = 1000;
module_param(cache_time, uint, 0644);
MODULE_PARM_DESC(cache_time, "cache time in milliseconds");

#ifdef CONFIG_ACPI_PROCFS_POWER
extern struct proc_dir_entry *acpi_lock_battery_dir(void);
extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);

enum acpi_battery_files {
      info_tag = 0,
      state_tag,
      alarm_tag,
      ACPI_BATTERY_NUMFILES,
};

#endif

static const struct acpi_device_id battery_device_ids[] = {
      {"PNP0C0A", 0},
      {"", 0},
};

MODULE_DEVICE_TABLE(acpi, battery_device_ids);


struct acpi_battery {
      struct mutex lock;
#ifdef CONFIG_ACPI_SYSFS_POWER
      struct power_supply bat;
#endif
      struct acpi_device *device;
      unsigned long update_time;
      int current_now;
      int capacity_now;
      int voltage_now;
      int design_capacity;
      int full_charge_capacity;
      int technology;
      int design_voltage;
      int design_capacity_warning;
      int design_capacity_low;
      int capacity_granularity_1;
      int capacity_granularity_2;
      int alarm;
      char model_number[32];
      char serial_number[32];
      char type[32];
      char oem_info[32];
      int state;
      int power_unit;
      u8 alarm_present;
};

#define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);

inline int acpi_battery_present(struct acpi_battery *battery)
{
      return battery->device->status.battery_present;
}

#ifdef CONFIG_ACPI_SYSFS_POWER
static int acpi_battery_technology(struct acpi_battery *battery)
{
      if (!strcasecmp("NiCd", battery->type))
            return POWER_SUPPLY_TECHNOLOGY_NiCd;
      if (!strcasecmp("NiMH", battery->type))
            return POWER_SUPPLY_TECHNOLOGY_NiMH;
      if (!strcasecmp("LION", battery->type))
            return POWER_SUPPLY_TECHNOLOGY_LION;
      if (!strncasecmp("LI-ION", battery->type, 6))
            return POWER_SUPPLY_TECHNOLOGY_LION;
      if (!strcasecmp("LiP", battery->type))
            return POWER_SUPPLY_TECHNOLOGY_LIPO;
      return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
}

static int acpi_battery_get_state(struct acpi_battery *battery);

static int acpi_battery_get_property(struct power_supply *psy,
                             enum power_supply_property psp,
                             union power_supply_propval *val)
{
      struct acpi_battery *battery = to_acpi_battery(psy);

      if (acpi_battery_present(battery)) {
            /* run battery update only if it is present */
            acpi_battery_get_state(battery);
      } else if (psp != POWER_SUPPLY_PROP_PRESENT)
            return -ENODEV;
      switch (psp) {
      case POWER_SUPPLY_PROP_STATUS:
            if (battery->state & 0x01)
                  val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
            else if (battery->state & 0x02)
                  val->intval = POWER_SUPPLY_STATUS_CHARGING;
            else if (battery->state == 0)
                  val->intval = POWER_SUPPLY_STATUS_FULL;
            else
                  val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
            break;
      case POWER_SUPPLY_PROP_PRESENT:
            val->intval = acpi_battery_present(battery);
            break;
      case POWER_SUPPLY_PROP_TECHNOLOGY:
            val->intval = acpi_battery_technology(battery);
            break;
      case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
            val->intval = battery->design_voltage * 1000;
            break;
      case POWER_SUPPLY_PROP_VOLTAGE_NOW:
            val->intval = battery->voltage_now * 1000;
            break;
      case POWER_SUPPLY_PROP_CURRENT_NOW:
            val->intval = battery->current_now * 1000;
            break;
      case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
      case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
            val->intval = battery->design_capacity * 1000;
            break;
      case POWER_SUPPLY_PROP_CHARGE_FULL:
      case POWER_SUPPLY_PROP_ENERGY_FULL:
            val->intval = battery->full_charge_capacity * 1000;
            break;
      case POWER_SUPPLY_PROP_CHARGE_NOW:
      case POWER_SUPPLY_PROP_ENERGY_NOW:
            val->intval = battery->capacity_now * 1000;
            break;
      case POWER_SUPPLY_PROP_MODEL_NAME:
            val->strval = battery->model_number;
            break;
      case POWER_SUPPLY_PROP_MANUFACTURER:
            val->strval = battery->oem_info;
            break;
      default:
            return -EINVAL;
      }
      return 0;
}

static enum power_supply_property charge_battery_props[] = {
      POWER_SUPPLY_PROP_STATUS,
      POWER_SUPPLY_PROP_PRESENT,
      POWER_SUPPLY_PROP_TECHNOLOGY,
      POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
      POWER_SUPPLY_PROP_VOLTAGE_NOW,
      POWER_SUPPLY_PROP_CURRENT_NOW,
      POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
      POWER_SUPPLY_PROP_CHARGE_FULL,
      POWER_SUPPLY_PROP_CHARGE_NOW,
      POWER_SUPPLY_PROP_MODEL_NAME,
      POWER_SUPPLY_PROP_MANUFACTURER,
};

static enum power_supply_property energy_battery_props[] = {
      POWER_SUPPLY_PROP_STATUS,
      POWER_SUPPLY_PROP_PRESENT,
      POWER_SUPPLY_PROP_TECHNOLOGY,
      POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
      POWER_SUPPLY_PROP_VOLTAGE_NOW,
      POWER_SUPPLY_PROP_CURRENT_NOW,
      POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
      POWER_SUPPLY_PROP_ENERGY_FULL,
      POWER_SUPPLY_PROP_ENERGY_NOW,
      POWER_SUPPLY_PROP_MODEL_NAME,
      POWER_SUPPLY_PROP_MANUFACTURER,
};
#endif

#ifdef CONFIG_ACPI_PROCFS_POWER
inline char *acpi_battery_units(struct acpi_battery *battery)
{
      return (battery->power_unit)?"mA":"mW";
}
#endif

/* --------------------------------------------------------------------------
                               Battery Management
   -------------------------------------------------------------------------- */
struct acpi_offsets {
      size_t offset;          /* offset inside struct acpi_sbs_battery */
      u8 mode;          /* int or string? */
};

static struct acpi_offsets state_offsets[] = {
      {offsetof(struct acpi_battery, state), 0},
      {offsetof(struct acpi_battery, current_now), 0},
      {offsetof(struct acpi_battery, capacity_now), 0},
      {offsetof(struct acpi_battery, voltage_now), 0},
};

static struct acpi_offsets info_offsets[] = {
      {offsetof(struct acpi_battery, power_unit), 0},
      {offsetof(struct acpi_battery, design_capacity), 0},
      {offsetof(struct acpi_battery, full_charge_capacity), 0},
      {offsetof(struct acpi_battery, technology), 0},
      {offsetof(struct acpi_battery, design_voltage), 0},
      {offsetof(struct acpi_battery, design_capacity_warning), 0},
      {offsetof(struct acpi_battery, design_capacity_low), 0},
      {offsetof(struct acpi_battery, capacity_granularity_1), 0},
      {offsetof(struct acpi_battery, capacity_granularity_2), 0},
      {offsetof(struct acpi_battery, model_number), 1},
      {offsetof(struct acpi_battery, serial_number), 1},
      {offsetof(struct acpi_battery, type), 1},
      {offsetof(struct acpi_battery, oem_info), 1},
};

static int extract_package(struct acpi_battery *battery,
                     union acpi_object *package,
                     struct acpi_offsets *offsets, int num)
{
      int i;
      union acpi_object *element;
      if (package->type != ACPI_TYPE_PACKAGE)
            return -EFAULT;
      for (i = 0; i < num; ++i) {
            if (package->package.count <= i)
                  return -EFAULT;
            element = &package->package.elements[i];
            if (offsets[i].mode) {
                  u8 *ptr = (u8 *)battery + offsets[i].offset;
                  if (element->type == ACPI_TYPE_STRING ||
                      element->type == ACPI_TYPE_BUFFER)
                        strncpy(ptr, element->string.pointer, 32);
                  else if (element->type == ACPI_TYPE_INTEGER) {
                        strncpy(ptr, (u8 *)&element->integer.value,
                              sizeof(acpi_integer));
                        ptr[sizeof(acpi_integer)] = 0;
                  } else return -EFAULT;
            } else {
                  if (element->type == ACPI_TYPE_INTEGER) {
                        int *x = (int *)((u8 *)battery +
                                    offsets[i].offset);
                        *x = element->integer.value;
                  } else return -EFAULT;
            }
      }
      return 0;
}

static int acpi_battery_get_status(struct acpi_battery *battery)
{
      if (acpi_bus_get_status(battery->device)) {
            ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
            return -ENODEV;
      }
      return 0;
}

static int acpi_battery_get_info(struct acpi_battery *battery)
{
      int result = -EFAULT;
      acpi_status status = 0;
      struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };

      if (!acpi_battery_present(battery))
            return 0;
      mutex_lock(&battery->lock);
      status = acpi_evaluate_object(battery->device->handle, "_BIF",
                              NULL, &buffer);
      mutex_unlock(&battery->lock);

      if (ACPI_FAILURE(status)) {
            ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BIF"));
            return -ENODEV;
      }

      result = extract_package(battery, buffer.pointer,
                         info_offsets, ARRAY_SIZE(info_offsets));
      kfree(buffer.pointer);
      return result;
}

static int acpi_battery_get_state(struct acpi_battery *battery)
{
      int result = 0;
      acpi_status status = 0;
      struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };

      if (!acpi_battery_present(battery))
            return 0;

      if (battery->update_time &&
          time_before(jiffies, battery->update_time +
                  msecs_to_jiffies(cache_time)))
            return 0;

      mutex_lock(&battery->lock);
      status = acpi_evaluate_object(battery->device->handle, "_BST",
                              NULL, &buffer);
      mutex_unlock(&battery->lock);

      if (ACPI_FAILURE(status)) {
            ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
            return -ENODEV;
      }

      result = extract_package(battery, buffer.pointer,
                         state_offsets, ARRAY_SIZE(state_offsets));
      battery->update_time = jiffies;
      kfree(buffer.pointer);
      return result;
}

static int acpi_battery_set_alarm(struct acpi_battery *battery)
{
      acpi_status status = 0;
      union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
      struct acpi_object_list arg_list = { 1, &arg0 };

      if (!acpi_battery_present(battery)|| !battery->alarm_present)
            return -ENODEV;

      arg0.integer.value = battery->alarm;

      mutex_lock(&battery->lock);
      status = acpi_evaluate_object(battery->device->handle, "_BTP",
                         &arg_list, NULL);
      mutex_unlock(&battery->lock);

      if (ACPI_FAILURE(status))
            return -ENODEV;

      ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
      return 0;
}

static int acpi_battery_init_alarm(struct acpi_battery *battery)
{
      acpi_status status = AE_OK;
      acpi_handle handle = NULL;

      /* See if alarms are supported, and if so, set default */
      status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
      if (ACPI_FAILURE(status)) {
            battery->alarm_present = 0;
            return 0;
      }
      battery->alarm_present = 1;
      if (!battery->alarm)
            battery->alarm = battery->design_capacity_warning;
      return acpi_battery_set_alarm(battery);
}

#ifdef CONFIG_ACPI_SYSFS_POWER
static ssize_t acpi_battery_alarm_show(struct device *dev,
                              struct device_attribute *attr,
                              char *buf)
{
      struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
      return sprintf(buf, "%d\n", battery->alarm * 1000);
}

static ssize_t acpi_battery_alarm_store(struct device *dev,
                              struct device_attribute *attr,
                              const char *buf, size_t count)
{
      unsigned long x;
      struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
      if (sscanf(buf, "%ld\n", &x) == 1)
            battery->alarm = x/1000;
      if (acpi_battery_present(battery))
            acpi_battery_set_alarm(battery);
      return count;
}

static struct device_attribute alarm_attr = {
      .attr = {.name = "alarm", .mode = 0644, .owner = THIS_MODULE},
      .show = acpi_battery_alarm_show,
      .store = acpi_battery_alarm_store,
};

static int sysfs_add_battery(struct acpi_battery *battery)
{
      int result;

      if (battery->power_unit) {
            battery->bat.properties = charge_battery_props;
            battery->bat.num_properties =
                  ARRAY_SIZE(charge_battery_props);
      } else {
            battery->bat.properties = energy_battery_props;
            battery->bat.num_properties =
                  ARRAY_SIZE(energy_battery_props);
      }

      battery->bat.name = acpi_device_bid(battery->device);
      battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
      battery->bat.get_property = acpi_battery_get_property;

      result = power_supply_register(&battery->device->dev, &battery->bat);
      if (result)
            return result;
      return device_create_file(battery->bat.dev, &alarm_attr);
}

static void sysfs_remove_battery(struct acpi_battery *battery)
{
      if (!battery->bat.dev)
            return;
      device_remove_file(battery->bat.dev, &alarm_attr);
      power_supply_unregister(&battery->bat);
      battery->bat.dev = NULL;
}
#endif

static int acpi_battery_update(struct acpi_battery *battery)
{
      int result;
      result = acpi_battery_get_status(battery);
      if (result)
            return result;
#ifdef CONFIG_ACPI_SYSFS_POWER
      if (!acpi_battery_present(battery)) {
            sysfs_remove_battery(battery);
            battery->update_time = 0;
            return 0;
      }
#endif
      if (!battery->update_time) {
            result = acpi_battery_get_info(battery);
            if (result)
                  return result;
            acpi_battery_init_alarm(battery);
      }
#ifdef CONFIG_ACPI_SYSFS_POWER
      if (!battery->bat.dev)
            sysfs_add_battery(battery);
#endif
      return acpi_battery_get_state(battery);
}

/* --------------------------------------------------------------------------
                              FS Interface (/proc)
   -------------------------------------------------------------------------- */

#ifdef CONFIG_ACPI_PROCFS_POWER
static struct proc_dir_entry *acpi_battery_dir;

static int acpi_battery_print_info(struct seq_file *seq, int result)
{
      struct acpi_battery *battery = seq->private;

      if (result)
            goto end;

      seq_printf(seq, "present:                 %s\n",
               acpi_battery_present(battery)?"yes":"no");
      if (!acpi_battery_present(battery))
            goto end;
      if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
            seq_printf(seq, "design capacity:         unknown\n");
      else
            seq_printf(seq, "design capacity:         %d %sh\n",
                     battery->design_capacity,
                     acpi_battery_units(battery));

      if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
            seq_printf(seq, "last full capacity:      unknown\n");
      else
            seq_printf(seq, "last full capacity:      %d %sh\n",
                     battery->full_charge_capacity,
                     acpi_battery_units(battery));

      seq_printf(seq, "battery technology:      %srechargeable\n",
               (!battery->technology)?"non-":"");

      if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
            seq_printf(seq, "design voltage:          unknown\n");
      else
            seq_printf(seq, "design voltage:          %d mV\n",
                     battery->design_voltage);
      seq_printf(seq, "design capacity warning: %d %sh\n",
               battery->design_capacity_warning,
               acpi_battery_units(battery));
      seq_printf(seq, "design capacity low:     %d %sh\n",
               battery->design_capacity_low,
               acpi_battery_units(battery));
      seq_printf(seq, "capacity granularity 1:  %d %sh\n",
               battery->capacity_granularity_1,
               acpi_battery_units(battery));
      seq_printf(seq, "capacity granularity 2:  %d %sh\n",
               battery->capacity_granularity_2,
               acpi_battery_units(battery));
      seq_printf(seq, "model number:            %s\n", battery->model_number);
      seq_printf(seq, "serial number:           %s\n", battery->serial_number);
      seq_printf(seq, "battery type:            %s\n", battery->type);
      seq_printf(seq, "OEM info:                %s\n", battery->oem_info);
      end:
      if (result)
            seq_printf(seq, "ERROR: Unable to read battery info\n");
      return result;
}

static int acpi_battery_print_state(struct seq_file *seq, int result)
{
      struct acpi_battery *battery = seq->private;

      if (result)
            goto end;

      seq_printf(seq, "present:                 %s\n",
               acpi_battery_present(battery)?"yes":"no");
      if (!acpi_battery_present(battery))
            goto end;

      seq_printf(seq, "capacity state:          %s\n",
                  (battery->state & 0x04)?"critical":"ok");
      if ((battery->state & 0x01) && (battery->state & 0x02))
            seq_printf(seq,
                     "charging state:          charging/discharging\n");
      else if (battery->state & 0x01)
            seq_printf(seq, "charging state:          discharging\n");
      else if (battery->state & 0x02)
            seq_printf(seq, "charging state:          charging\n");
      else
            seq_printf(seq, "charging state:          charged\n");

      if (battery->current_now == ACPI_BATTERY_VALUE_UNKNOWN)
            seq_printf(seq, "present rate:            unknown\n");
      else
            seq_printf(seq, "present rate:            %d %s\n",
                     battery->current_now, acpi_battery_units(battery));

      if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
            seq_printf(seq, "remaining capacity:      unknown\n");
      else
            seq_printf(seq, "remaining capacity:      %d %sh\n",
                     battery->capacity_now, acpi_battery_units(battery));
      if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
            seq_printf(seq, "present voltage:         unknown\n");
      else
            seq_printf(seq, "present voltage:         %d mV\n",
                     battery->voltage_now);
      end:
      if (result)
            seq_printf(seq, "ERROR: Unable to read battery state\n");

      return result;
}

static int acpi_battery_print_alarm(struct seq_file *seq, int result)
{
      struct acpi_battery *battery = seq->private;

      if (result)
            goto end;

      if (!acpi_battery_present(battery)) {
            seq_printf(seq, "present:                 no\n");
            goto end;
      }
      seq_printf(seq, "alarm:                   ");
      if (!battery->alarm)
            seq_printf(seq, "unsupported\n");
      else
            seq_printf(seq, "%u %sh\n", battery->alarm,
                        acpi_battery_units(battery));
      end:
      if (result)
            seq_printf(seq, "ERROR: Unable to read battery alarm\n");
      return result;
}

static ssize_t acpi_battery_write_alarm(struct file *file,
                              const char __user * buffer,
                              size_t count, loff_t * ppos)
{
      int result = 0;
      char alarm_string[12] = { '\0' };
      struct seq_file *m = file->private_data;
      struct acpi_battery *battery = m->private;

      if (!battery || (count > sizeof(alarm_string) - 1))
            return -EINVAL;
      if (!acpi_battery_present(battery)) {
            result = -ENODEV;
            goto end;
      }
      if (copy_from_user(alarm_string, buffer, count)) {
            result = -EFAULT;
            goto end;
      }
      alarm_string[count] = '\0';
      battery->alarm = simple_strtol(alarm_string, NULL, 0);
      result = acpi_battery_set_alarm(battery);
      end:
      if (!result)
            return count;
      return result;
}

typedef int(*print_func)(struct seq_file *seq, int result);

static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
      acpi_battery_print_info,
      acpi_battery_print_state,
      acpi_battery_print_alarm,
};

static int acpi_battery_read(int fid, struct seq_file *seq)
{
      struct acpi_battery *battery = seq->private;
      int result = acpi_battery_update(battery);
      return acpi_print_funcs[fid](seq, result);
}

#define DECLARE_FILE_FUNCTIONS(_name) \
static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
{ \
      return acpi_battery_read(_name##_tag, seq); \
} \
static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
{ \
      return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
}

DECLARE_FILE_FUNCTIONS(info);
DECLARE_FILE_FUNCTIONS(state);
DECLARE_FILE_FUNCTIONS(alarm);

#undef DECLARE_FILE_FUNCTIONS

#define FILE_DESCRIPTION_RO(_name) \
      { \
      .name = __stringify(_name), \
      .mode = S_IRUGO, \
      .ops = { \
            .open = acpi_battery_##_name##_open_fs, \
            .read = seq_read, \
            .llseek = seq_lseek, \
            .release = single_release, \
            .owner = THIS_MODULE, \
            }, \
      }

#define FILE_DESCRIPTION_RW(_name) \
      { \
      .name = __stringify(_name), \
      .mode = S_IFREG | S_IRUGO | S_IWUSR, \
      .ops = { \
            .open = acpi_battery_##_name##_open_fs, \
            .read = seq_read, \
            .llseek = seq_lseek, \
            .write = acpi_battery_write_##_name, \
            .release = single_release, \
            .owner = THIS_MODULE, \
            }, \
      }

static struct battery_file {
      struct file_operations ops;
      mode_t mode;
      char *name;
} acpi_battery_file[] = {
      FILE_DESCRIPTION_RO(info),
      FILE_DESCRIPTION_RO(state),
      FILE_DESCRIPTION_RW(alarm),
};

#undef FILE_DESCRIPTION_RO
#undef FILE_DESCRIPTION_RW

static int acpi_battery_add_fs(struct acpi_device *device)
{
      struct proc_dir_entry *entry = NULL;
      int i;

      if (!acpi_device_dir(device)) {
            acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
                                         acpi_battery_dir);
            if (!acpi_device_dir(device))
                  return -ENODEV;
            acpi_device_dir(device)->owner = THIS_MODULE;
      }

      for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
            entry = create_proc_entry(acpi_battery_file[i].name,
                          acpi_battery_file[i].mode, acpi_device_dir(device));
            if (!entry)
                  return -ENODEV;
            else {
                  entry->proc_fops = &acpi_battery_file[i].ops;
                  entry->data = acpi_driver_data(device);
                  entry->owner = THIS_MODULE;
            }
      }
      return 0;
}

static void acpi_battery_remove_fs(struct acpi_device *device)
{
      int i;
      if (!acpi_device_dir(device))
            return;
      for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
            remove_proc_entry(acpi_battery_file[i].name,
                          acpi_device_dir(device));

      remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
      acpi_device_dir(device) = NULL;
}

#endif

/* --------------------------------------------------------------------------
                                 Driver Interface
   -------------------------------------------------------------------------- */

static void acpi_battery_notify(acpi_handle handle, u32 event, void *data)
{
      struct acpi_battery *battery = data;
      struct acpi_device *device;
      if (!battery)
            return;
      device = battery->device;
      acpi_battery_update(battery);
      acpi_bus_generate_proc_event(device, event,
                             acpi_battery_present(battery));
      acpi_bus_generate_netlink_event(device->pnp.device_class,
                              device->dev.bus_id, event,
                              acpi_battery_present(battery));
#ifdef CONFIG_ACPI_SYSFS_POWER
      /* acpi_batter_update could remove power_supply object */
      if (battery->bat.dev)
            kobject_uevent(&battery->bat.dev->kobj, KOBJ_CHANGE);
#endif
}

static int acpi_battery_add(struct acpi_device *device)
{
      int result = 0;
      acpi_status status = 0;
      struct acpi_battery *battery = NULL;
      if (!device)
            return -EINVAL;
      battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
      if (!battery)
            return -ENOMEM;
      battery->device = device;
      strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
      strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
      acpi_driver_data(device) = battery;
      mutex_init(&battery->lock);
      acpi_battery_update(battery);
#ifdef CONFIG_ACPI_PROCFS_POWER
      result = acpi_battery_add_fs(device);
      if (result)
            goto end;
#endif
      status = acpi_install_notify_handler(device->handle,
                                   ACPI_ALL_NOTIFY,
                                   acpi_battery_notify, battery);
      if (ACPI_FAILURE(status)) {
            ACPI_EXCEPTION((AE_INFO, status, "Installing notify handler"));
            result = -ENODEV;
            goto end;
      }
      printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
             ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
             device->status.battery_present ? "present" : "absent");
      end:
      if (result) {
#ifdef CONFIG_ACPI_PROCFS_POWER
            acpi_battery_remove_fs(device);
#endif
            kfree(battery);
      }
      return result;
}

static int acpi_battery_remove(struct acpi_device *device, int type)
{
      acpi_status status = 0;
      struct acpi_battery *battery = NULL;

      if (!device || !acpi_driver_data(device))
            return -EINVAL;
      battery = acpi_driver_data(device);
      status = acpi_remove_notify_handler(device->handle,
                                  ACPI_ALL_NOTIFY,
                                  acpi_battery_notify);
#ifdef CONFIG_ACPI_PROCFS_POWER
      acpi_battery_remove_fs(device);
#endif
#ifdef CONFIG_ACPI_SYSFS_POWER
      sysfs_remove_battery(battery);
#endif
      mutex_destroy(&battery->lock);
      kfree(battery);
      return 0;
}

/* this is needed to learn about changes made in suspended state */
static int acpi_battery_resume(struct acpi_device *device)
{
      struct acpi_battery *battery;
      if (!device)
            return -EINVAL;
      battery = acpi_driver_data(device);
      battery->update_time = 0;
      acpi_battery_update(battery);
      return 0;
}

static struct acpi_driver acpi_battery_driver = {
      .name = "battery",
      .class = ACPI_BATTERY_CLASS,
      .ids = battery_device_ids,
      .ops = {
            .add = acpi_battery_add,
            .resume = acpi_battery_resume,
            .remove = acpi_battery_remove,
            },
};

static int __init acpi_battery_init(void)
{
      if (acpi_disabled)
            return -ENODEV;
#ifdef CONFIG_ACPI_PROCFS_POWER
      acpi_battery_dir = acpi_lock_battery_dir();
      if (!acpi_battery_dir)
            return -ENODEV;
#endif
      if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
#ifdef CONFIG_ACPI_PROCFS_POWER
            acpi_unlock_battery_dir(acpi_battery_dir);
#endif
            return -ENODEV;
      }
      return 0;
}

static void __exit acpi_battery_exit(void)
{
      acpi_bus_unregister_driver(&acpi_battery_driver);
#ifdef CONFIG_ACPI_PROCFS_POWER
      acpi_unlock_battery_dir(acpi_battery_dir);
#endif
}

module_init(acpi_battery_init);
module_exit(acpi_battery_exit);

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