Logo Search packages:      
Sourcecode: linux version File versions  Download package

sbs.c

/*
 *  sbs.c - ACPI Smart Battery System Driver ($Revision: 2.0 $)
 *
 *  Copyright (c) 2007 Alexey Starikovskiy <astarikovskiy@suse.de>
 *  Copyright (c) 2005-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com>
 *  Copyright (c) 2005 Rich Townsend <rhdt@bartol.udel.edu>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  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/init.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>

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

#include <linux/acpi.h>
#include <linux/timer.h>
#include <linux/jiffies.h>
#include <linux/delay.h>

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

#include "sbshc.h"

#define ACPI_SBS_CLASS              "sbs"
#define ACPI_AC_CLASS               "ac_adapter"
#define ACPI_BATTERY_CLASS          "battery"
#define ACPI_SBS_DEVICE_NAME        "Smart Battery System"
#define ACPI_SBS_FILE_INFO          "info"
#define ACPI_SBS_FILE_STATE         "state"
#define ACPI_SBS_FILE_ALARM         "alarm"
#define ACPI_BATTERY_DIR_NAME       "BAT%i"
#define ACPI_AC_DIR_NAME            "AC0"

#define ACPI_SBS_NOTIFY_STATUS            0x80
#define ACPI_SBS_NOTIFY_INFO        0x81

MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
MODULE_DESCRIPTION("Smart Battery System ACPI interface 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");

extern struct proc_dir_entry *acpi_lock_ac_dir(void);
extern struct proc_dir_entry *acpi_lock_battery_dir(void);
extern void acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
extern void acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);

#define MAX_SBS_BAT                 4
#define ACPI_SBS_BLOCK_MAX          32

static const struct acpi_device_id sbs_device_ids[] = {
      {"ACPI0002", 0},
      {"", 0},
};
MODULE_DEVICE_TABLE(acpi, sbs_device_ids);

struct acpi_battery {
#ifdef CONFIG_ACPI_SYSFS_POWER
      struct power_supply bat;
#endif
      struct acpi_sbs *sbs;
#ifdef CONFIG_ACPI_PROCFS_POWER
      struct proc_dir_entry *proc_entry;
#endif
      unsigned long update_time;
      char name[8];
      char manufacturer_name[ACPI_SBS_BLOCK_MAX];
      char device_name[ACPI_SBS_BLOCK_MAX];
      char device_chemistry[ACPI_SBS_BLOCK_MAX];
      u16 alarm_capacity;
      u16 full_charge_capacity;
      u16 design_capacity;
      u16 design_voltage;
      u16 serial_number;
      u16 cycle_count;
      u16 temp_now;
      u16 voltage_now;
      s16 current_now;
      s16 current_avg;
      u16 capacity_now;
      u16 state_of_charge;
      u16 state;
      u16 mode;
      u16 spec;
      u8 id;
      u8 present:1;
      u8 have_sysfs_alarm:1;
};

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

struct acpi_sbs {
#ifdef CONFIG_ACPI_SYSFS_POWER
      struct power_supply charger;
#endif
      struct acpi_device *device;
      struct acpi_smb_hc *hc;
      struct mutex lock;
#ifdef CONFIG_ACPI_PROCFS_POWER
      struct proc_dir_entry *charger_entry;
#endif
      struct acpi_battery battery[MAX_SBS_BAT];
      u8 batteries_supported:4;
      u8 manager_present:1;
      u8 charger_present:1;
};

#define to_acpi_sbs(x) container_of(x, struct acpi_sbs, charger)

static inline int battery_scale(int log)
{
      int scale = 1;
      while (log--)
            scale *= 10;
      return scale;
}

static inline int acpi_battery_vscale(struct acpi_battery *battery)
{
      return battery_scale((battery->spec & 0x0f00) >> 8);
}

static inline int acpi_battery_ipscale(struct acpi_battery *battery)
{
      return battery_scale((battery->spec & 0xf000) >> 12);
}

static inline int acpi_battery_mode(struct acpi_battery *battery)
{
      return (battery->mode & 0x8000);
}

static inline int acpi_battery_scale(struct acpi_battery *battery)
{
      return (acpi_battery_mode(battery) ? 10 : 1) *
          acpi_battery_ipscale(battery);
}

#ifdef CONFIG_ACPI_SYSFS_POWER
static int sbs_get_ac_property(struct power_supply *psy,
                         enum power_supply_property psp,
                         union power_supply_propval *val)
{
      struct acpi_sbs *sbs = to_acpi_sbs(psy);
      switch (psp) {
      case POWER_SUPPLY_PROP_ONLINE:
            val->intval = sbs->charger_present;
            break;
      default:
            return -EINVAL;
      }
      return 0;
}

static int acpi_battery_technology(struct acpi_battery *battery)
{
      if (!strcasecmp("NiCd", battery->device_chemistry))
            return POWER_SUPPLY_TECHNOLOGY_NiCd;
      if (!strcasecmp("NiMH", battery->device_chemistry))
            return POWER_SUPPLY_TECHNOLOGY_NiMH;
      if (!strcasecmp("LION", battery->device_chemistry))
            return POWER_SUPPLY_TECHNOLOGY_LION;
      if (!strcasecmp("LiP", battery->device_chemistry))
            return POWER_SUPPLY_TECHNOLOGY_LIPO;
      return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
}

static int acpi_sbs_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 ((!battery->present) && psp != POWER_SUPPLY_PROP_PRESENT)
            return -ENODEV;
      switch (psp) {
      case POWER_SUPPLY_PROP_STATUS:
            if (battery->current_now < 0)
                  val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
            else if (battery->current_now > 0)
                  val->intval = POWER_SUPPLY_STATUS_CHARGING;
            else
                  val->intval = POWER_SUPPLY_STATUS_FULL;
            break;
      case POWER_SUPPLY_PROP_PRESENT:
            val->intval = battery->present;
            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 *
                  acpi_battery_vscale(battery) * 1000;
            break;
      case POWER_SUPPLY_PROP_VOLTAGE_NOW:
            val->intval = battery->voltage_now *
                        acpi_battery_vscale(battery) * 1000;
            break;
      case POWER_SUPPLY_PROP_CURRENT_NOW:
            val->intval = abs(battery->current_now) *
                        acpi_battery_ipscale(battery) * 1000;
            break;
      case POWER_SUPPLY_PROP_CURRENT_AVG:
            val->intval = abs(battery->current_avg) *
                        acpi_battery_ipscale(battery) * 1000;
            break;
      case POWER_SUPPLY_PROP_CAPACITY:
            val->intval = battery->state_of_charge;
            break;
      case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
      case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
            val->intval = battery->design_capacity *
                  acpi_battery_scale(battery) * 1000;
            break;
      case POWER_SUPPLY_PROP_CHARGE_FULL:
      case POWER_SUPPLY_PROP_ENERGY_FULL:
            val->intval = battery->full_charge_capacity *
                  acpi_battery_scale(battery) * 1000;
            break;
      case POWER_SUPPLY_PROP_CHARGE_NOW:
      case POWER_SUPPLY_PROP_ENERGY_NOW:
            val->intval = battery->capacity_now *
                        acpi_battery_scale(battery) * 1000;
            break;
      case POWER_SUPPLY_PROP_TEMP:
            val->intval = battery->temp_now - 2730;   // dK -> dC
            break;
      case POWER_SUPPLY_PROP_MODEL_NAME:
            val->strval = battery->device_name;
            break;
      case POWER_SUPPLY_PROP_MANUFACTURER:
            val->strval = battery->manufacturer_name;
            break;
      default:
            return -EINVAL;
      }
      return 0;
}

static enum power_supply_property sbs_ac_props[] = {
      POWER_SUPPLY_PROP_ONLINE,
};

static enum power_supply_property sbs_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_CURRENT_AVG,
      POWER_SUPPLY_PROP_CAPACITY,
      POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
      POWER_SUPPLY_PROP_CHARGE_FULL,
      POWER_SUPPLY_PROP_CHARGE_NOW,
      POWER_SUPPLY_PROP_TEMP,
      POWER_SUPPLY_PROP_MODEL_NAME,
      POWER_SUPPLY_PROP_MANUFACTURER,
};

static enum power_supply_property sbs_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_CURRENT_AVG,
      POWER_SUPPLY_PROP_CAPACITY,
      POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
      POWER_SUPPLY_PROP_ENERGY_FULL,
      POWER_SUPPLY_PROP_ENERGY_NOW,
      POWER_SUPPLY_PROP_TEMP,
      POWER_SUPPLY_PROP_MODEL_NAME,
      POWER_SUPPLY_PROP_MANUFACTURER,
};
#endif

/* --------------------------------------------------------------------------
                            Smart Battery System Management
   -------------------------------------------------------------------------- */

struct acpi_battery_reader {
      u8 command;       /* command for battery */
      u8 mode;          /* word or block? */
      size_t offset;          /* offset inside struct acpi_sbs_battery */
};

static struct acpi_battery_reader info_readers[] = {
      {0x01, SMBUS_READ_WORD, offsetof(struct acpi_battery, alarm_capacity)},
      {0x03, SMBUS_READ_WORD, offsetof(struct acpi_battery, mode)},
      {0x10, SMBUS_READ_WORD, offsetof(struct acpi_battery, full_charge_capacity)},
      {0x17, SMBUS_READ_WORD, offsetof(struct acpi_battery, cycle_count)},
      {0x18, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_capacity)},
      {0x19, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_voltage)},
      {0x1a, SMBUS_READ_WORD, offsetof(struct acpi_battery, spec)},
      {0x1c, SMBUS_READ_WORD, offsetof(struct acpi_battery, serial_number)},
      {0x20, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, manufacturer_name)},
      {0x21, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_name)},
      {0x22, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_chemistry)},
};

static struct acpi_battery_reader state_readers[] = {
      {0x08, SMBUS_READ_WORD, offsetof(struct acpi_battery, temp_now)},
      {0x09, SMBUS_READ_WORD, offsetof(struct acpi_battery, voltage_now)},
      {0x0a, SMBUS_READ_WORD, offsetof(struct acpi_battery, current_now)},
      {0x0b, SMBUS_READ_WORD, offsetof(struct acpi_battery, current_avg)},
      {0x0f, SMBUS_READ_WORD, offsetof(struct acpi_battery, capacity_now)},
      {0x0e, SMBUS_READ_WORD, offsetof(struct acpi_battery, state_of_charge)},
      {0x16, SMBUS_READ_WORD, offsetof(struct acpi_battery, state)},
};

static int acpi_manager_get_info(struct acpi_sbs *sbs)
{
      int result = 0;
      u16 battery_system_info;

      result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
                         0x04, (u8 *)&battery_system_info);
      if (!result)
            sbs->batteries_supported = battery_system_info & 0x000f;
      return result;
}

static int acpi_battery_get_info(struct acpi_battery *battery)
{
      int i, result = 0;

      for (i = 0; i < ARRAY_SIZE(info_readers); ++i) {
            result = acpi_smbus_read(battery->sbs->hc,
                               info_readers[i].mode,
                               ACPI_SBS_BATTERY,
                               info_readers[i].command,
                               (u8 *) battery +
                                    info_readers[i].offset);
            if (result)
                  break;
      }
      return result;
}

static int acpi_battery_get_state(struct acpi_battery *battery)
{
      int i, result = 0;

      if (battery->update_time &&
          time_before(jiffies, battery->update_time +
                        msecs_to_jiffies(cache_time)))
            return 0;
      for (i = 0; i < ARRAY_SIZE(state_readers); ++i) {
            result = acpi_smbus_read(battery->sbs->hc,
                               state_readers[i].mode,
                               ACPI_SBS_BATTERY,
                               state_readers[i].command,
                                 (u8 *)battery +
                                    state_readers[i].offset);
            if (result)
                  goto end;
      }
      end:
      battery->update_time = jiffies;
      return result;
}

static int acpi_battery_get_alarm(struct acpi_battery *battery)
{
      return acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
                         ACPI_SBS_BATTERY, 0x01,
                         (u8 *)&battery->alarm_capacity);
}

static int acpi_battery_set_alarm(struct acpi_battery *battery)
{
      struct acpi_sbs *sbs = battery->sbs;
      u16 value, sel = 1 << (battery->id + 12);

      int ret;


      if (sbs->manager_present) {
            ret = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
                        0x01, (u8 *)&value);
            if (ret)
                  goto end;
            if ((value & 0xf000) != sel) {
                  value &= 0x0fff;
                  value |= sel;
            ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD,
                               ACPI_SBS_MANAGER,
                               0x01, (u8 *)&value, 2);
            if (ret)
                  goto end;
            }
      }
      ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD, ACPI_SBS_BATTERY,
                        0x01, (u8 *)&battery->alarm_capacity, 2);
      end:
      return ret;
}

static int acpi_ac_get_present(struct acpi_sbs *sbs)
{
      int result;
      u16 status;

      result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_CHARGER,
                         0x13, (u8 *) & status);
      if (!result)
            sbs->charger_present = (status >> 15) & 0x1;
      return result;
}

#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));
      acpi_battery_get_alarm(battery);
      return sprintf(buf, "%d\n", battery->alarm_capacity *
                        acpi_battery_scale(battery) * 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_capacity = x /
                  (1000 * acpi_battery_scale(battery));
      if (battery->present)
            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,
};
#endif

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

#ifdef CONFIG_ACPI_PROCFS_POWER
/* Generic Routines */
static int
acpi_sbs_add_fs(struct proc_dir_entry **dir,
            struct proc_dir_entry *parent_dir,
            char *dir_name,
            struct file_operations *info_fops,
            struct file_operations *state_fops,
            struct file_operations *alarm_fops, void *data)
{
      struct proc_dir_entry *entry = NULL;

      if (!*dir) {
            *dir = proc_mkdir(dir_name, parent_dir);
            if (!*dir) {
                  return -ENODEV;
            }
            (*dir)->owner = THIS_MODULE;
      }

      /* 'info' [R] */
      if (info_fops) {
            entry = create_proc_entry(ACPI_SBS_FILE_INFO, S_IRUGO, *dir);
            if (entry) {
                  entry->proc_fops = info_fops;
                  entry->data = data;
                  entry->owner = THIS_MODULE;
            }
      }

      /* 'state' [R] */
      if (state_fops) {
            entry = create_proc_entry(ACPI_SBS_FILE_STATE, S_IRUGO, *dir);
            if (entry) {
                  entry->proc_fops = state_fops;
                  entry->data = data;
                  entry->owner = THIS_MODULE;
            }
      }

      /* 'alarm' [R/W] */
      if (alarm_fops) {
            entry = create_proc_entry(ACPI_SBS_FILE_ALARM, S_IRUGO, *dir);
            if (entry) {
                  entry->proc_fops = alarm_fops;
                  entry->data = data;
                  entry->owner = THIS_MODULE;
            }
      }
      return 0;
}

static void
acpi_sbs_remove_fs(struct proc_dir_entry **dir,
                     struct proc_dir_entry *parent_dir)
{
      if (*dir) {
            remove_proc_entry(ACPI_SBS_FILE_INFO, *dir);
            remove_proc_entry(ACPI_SBS_FILE_STATE, *dir);
            remove_proc_entry(ACPI_SBS_FILE_ALARM, *dir);
            remove_proc_entry((*dir)->name, parent_dir);
            *dir = NULL;
      }
}

/* Smart Battery Interface */
static struct proc_dir_entry *acpi_battery_dir = NULL;

static inline char *acpi_battery_units(struct acpi_battery *battery)
{
      return acpi_battery_mode(battery) ? " mW" : " mA";
}


static int acpi_battery_read_info(struct seq_file *seq, void *offset)
{
      struct acpi_battery *battery = seq->private;
      struct acpi_sbs *sbs = battery->sbs;
      int result = 0;

      mutex_lock(&sbs->lock);

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

      seq_printf(seq, "design capacity:         %i%sh\n",
               battery->design_capacity * acpi_battery_scale(battery),
               acpi_battery_units(battery));
      seq_printf(seq, "last full capacity:      %i%sh\n",
               battery->full_charge_capacity * acpi_battery_scale(battery),
               acpi_battery_units(battery));
      seq_printf(seq, "battery technology:      rechargeable\n");
      seq_printf(seq, "design voltage:          %i mV\n",
               battery->design_voltage * acpi_battery_vscale(battery));
      seq_printf(seq, "design capacity warning: unknown\n");
      seq_printf(seq, "design capacity low:     unknown\n");
      seq_printf(seq, "capacity granularity 1:  unknown\n");
      seq_printf(seq, "capacity granularity 2:  unknown\n");
      seq_printf(seq, "model number:            %s\n", battery->device_name);
      seq_printf(seq, "serial number:           %i\n",
               battery->serial_number);
      seq_printf(seq, "battery type:            %s\n",
               battery->device_chemistry);
      seq_printf(seq, "OEM info:                %s\n",
               battery->manufacturer_name);
      end:
      mutex_unlock(&sbs->lock);
      return result;
}

static int acpi_battery_info_open_fs(struct inode *inode, struct file *file)
{
      return single_open(file, acpi_battery_read_info, PDE(inode)->data);
}

static int acpi_battery_read_state(struct seq_file *seq, void *offset)
{
      struct acpi_battery *battery = seq->private;
      struct acpi_sbs *sbs = battery->sbs;
      int rate;

      mutex_lock(&sbs->lock);
      seq_printf(seq, "present:                 %s\n",
               (battery->present) ? "yes" : "no");
      if (!battery->present)
            goto end;

      acpi_battery_get_state(battery);
      seq_printf(seq, "capacity state:          %s\n",
               (battery->state & 0x0010) ? "critical" : "ok");
      seq_printf(seq, "charging state:          %s\n",
               (battery->current_now < 0) ? "discharging" :
               ((battery->current_now > 0) ? "charging" : "charged"));
      rate = abs(battery->current_now) * acpi_battery_ipscale(battery);
      rate *= (acpi_battery_mode(battery))?(battery->voltage_now *
                  acpi_battery_vscale(battery)/1000):1;
      seq_printf(seq, "present rate:            %d%s\n", rate,
               acpi_battery_units(battery));
      seq_printf(seq, "remaining capacity:      %i%sh\n",
               battery->capacity_now * acpi_battery_scale(battery),
               acpi_battery_units(battery));
      seq_printf(seq, "present voltage:         %i mV\n",
               battery->voltage_now * acpi_battery_vscale(battery));

      end:
      mutex_unlock(&sbs->lock);
      return 0;
}

static int acpi_battery_state_open_fs(struct inode *inode, struct file *file)
{
      return single_open(file, acpi_battery_read_state, PDE(inode)->data);
}

static int acpi_battery_read_alarm(struct seq_file *seq, void *offset)
{
      struct acpi_battery *battery = seq->private;
      struct acpi_sbs *sbs = battery->sbs;
      int result = 0;

      mutex_lock(&sbs->lock);

      if (!battery->present) {
            seq_printf(seq, "present:                 no\n");
            goto end;
      }

      acpi_battery_get_alarm(battery);
      seq_printf(seq, "alarm:                   ");
      if (battery->alarm_capacity)
            seq_printf(seq, "%i%sh\n",
                     battery->alarm_capacity *
                     acpi_battery_scale(battery),
                     acpi_battery_units(battery));
      else
            seq_printf(seq, "disabled\n");
      end:
      mutex_unlock(&sbs->lock);
      return result;
}

static ssize_t
acpi_battery_write_alarm(struct file *file, const char __user * buffer,
                   size_t count, loff_t * ppos)
{
      struct seq_file *seq = file->private_data;
      struct acpi_battery *battery = seq->private;
      struct acpi_sbs *sbs = battery->sbs;
      char alarm_string[12] = { '\0' };
      int result = 0;
      mutex_lock(&sbs->lock);
      if (!battery->present) {
            result = -ENODEV;
            goto end;
      }
      if (count > sizeof(alarm_string) - 1) {
            result = -EINVAL;
            goto end;
      }
      if (copy_from_user(alarm_string, buffer, count)) {
            result = -EFAULT;
            goto end;
      }
      alarm_string[count] = 0;
      battery->alarm_capacity = simple_strtoul(alarm_string, NULL, 0) /
                              acpi_battery_scale(battery);
      acpi_battery_set_alarm(battery);
      end:
      mutex_unlock(&sbs->lock);
      if (result)
            return result;
      return count;
}

static int acpi_battery_alarm_open_fs(struct inode *inode, struct file *file)
{
      return single_open(file, acpi_battery_read_alarm, PDE(inode)->data);
}

static struct file_operations acpi_battery_info_fops = {
      .open = acpi_battery_info_open_fs,
      .read = seq_read,
      .llseek = seq_lseek,
      .release = single_release,
      .owner = THIS_MODULE,
};

static struct file_operations acpi_battery_state_fops = {
      .open = acpi_battery_state_open_fs,
      .read = seq_read,
      .llseek = seq_lseek,
      .release = single_release,
      .owner = THIS_MODULE,
};

static struct file_operations acpi_battery_alarm_fops = {
      .open = acpi_battery_alarm_open_fs,
      .read = seq_read,
      .write = acpi_battery_write_alarm,
      .llseek = seq_lseek,
      .release = single_release,
      .owner = THIS_MODULE,
};

/* Legacy AC Adapter Interface */

static struct proc_dir_entry *acpi_ac_dir = NULL;

static int acpi_ac_read_state(struct seq_file *seq, void *offset)
{

      struct acpi_sbs *sbs = seq->private;

      mutex_lock(&sbs->lock);

      seq_printf(seq, "state:                   %s\n",
               sbs->charger_present ? "on-line" : "off-line");

      mutex_unlock(&sbs->lock);
      return 0;
}

static int acpi_ac_state_open_fs(struct inode *inode, struct file *file)
{
      return single_open(file, acpi_ac_read_state, PDE(inode)->data);
}

static struct file_operations acpi_ac_state_fops = {
      .open = acpi_ac_state_open_fs,
      .read = seq_read,
      .llseek = seq_lseek,
      .release = single_release,
      .owner = THIS_MODULE,
};

#endif

/* --------------------------------------------------------------------------
                                 Driver Interface
   -------------------------------------------------------------------------- */
static int acpi_battery_read(struct acpi_battery *battery)
{
      int result = 0, saved_present = battery->present;
      u16 state;

      if (battery->sbs->manager_present) {
            result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
                        ACPI_SBS_MANAGER, 0x01, (u8 *)&state);
            if (!result)
                  battery->present = state & (1 << battery->id);
            state &= 0x0fff;
            state |= 1 << (battery->id + 12);
            acpi_smbus_write(battery->sbs->hc, SMBUS_WRITE_WORD,
                          ACPI_SBS_MANAGER, 0x01, (u8 *)&state, 2);
      } else if (battery->id == 0)
            battery->present = 1;
      if (result || !battery->present)
            return result;

      if (saved_present != battery->present) {
            battery->update_time = 0;
            result = acpi_battery_get_info(battery);
            if (result)
                  return result;
      }
      result = acpi_battery_get_state(battery);
      return result;
}

/* Smart Battery */
static int acpi_battery_add(struct acpi_sbs *sbs, int id)
{
      struct acpi_battery *battery = &sbs->battery[id];
      int result;

      battery->id = id;
      battery->sbs = sbs;
      result = acpi_battery_read(battery);
      if (result)
            return result;

      sprintf(battery->name, ACPI_BATTERY_DIR_NAME, id);
#ifdef CONFIG_ACPI_PROCFS_POWER
      acpi_sbs_add_fs(&battery->proc_entry, acpi_battery_dir,
                  battery->name, &acpi_battery_info_fops,
                  &acpi_battery_state_fops, &acpi_battery_alarm_fops,
                  battery);
#endif
#ifdef CONFIG_ACPI_SYSFS_POWER
      battery->bat.name = battery->name;
      battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
      if (!acpi_battery_mode(battery)) {
            battery->bat.properties = sbs_charge_battery_props;
            battery->bat.num_properties =
                ARRAY_SIZE(sbs_charge_battery_props);
      } else {
            battery->bat.properties = sbs_energy_battery_props;
            battery->bat.num_properties =
                ARRAY_SIZE(sbs_energy_battery_props);
      }
      battery->bat.get_property = acpi_sbs_battery_get_property;
      result = power_supply_register(&sbs->device->dev, &battery->bat);
      if (result)
            goto end;
      result = device_create_file(battery->bat.dev, &alarm_attr);
      if (result)
            goto end;
      battery->have_sysfs_alarm = 1;
      end:
#endif
      printk(KERN_INFO PREFIX "%s [%s]: Battery Slot [%s] (battery %s)\n",
             ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
             battery->name, sbs->battery->present ? "present" : "absent");
      return result;
}

static void acpi_battery_remove(struct acpi_sbs *sbs, int id)
{
      struct acpi_battery *battery = &sbs->battery[id];
#ifdef CONFIG_ACPI_SYSFS_POWER
      if (battery->bat.dev) {
            if (battery->have_sysfs_alarm)
                  device_remove_file(battery->bat.dev, &alarm_attr);
            power_supply_unregister(&battery->bat);
      }
#endif
#ifdef CONFIG_ACPI_PROCFS_POWER
      if (battery->proc_entry)
            acpi_sbs_remove_fs(&battery->proc_entry, acpi_battery_dir);
#endif
}

static int acpi_charger_add(struct acpi_sbs *sbs)
{
      int result;

      result = acpi_ac_get_present(sbs);
      if (result)
            goto end;
#ifdef CONFIG_ACPI_PROCFS_POWER
      result = acpi_sbs_add_fs(&sbs->charger_entry, acpi_ac_dir,
                         ACPI_AC_DIR_NAME, NULL,
                         &acpi_ac_state_fops, NULL, sbs);
      if (result)
            goto end;
#endif
#ifdef CONFIG_ACPI_SYSFS_POWER
      sbs->charger.name = "sbs-charger";
      sbs->charger.type = POWER_SUPPLY_TYPE_MAINS;
      sbs->charger.properties = sbs_ac_props;
      sbs->charger.num_properties = ARRAY_SIZE(sbs_ac_props);
      sbs->charger.get_property = sbs_get_ac_property;
      power_supply_register(&sbs->device->dev, &sbs->charger);
#endif
      printk(KERN_INFO PREFIX "%s [%s]: AC Adapter [%s] (%s)\n",
             ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
             ACPI_AC_DIR_NAME, sbs->charger_present ? "on-line" : "off-line");
      end:
      return result;
}

static void acpi_charger_remove(struct acpi_sbs *sbs)
{
#ifdef CONFIG_ACPI_SYSFS_POWER
      if (sbs->charger.dev)
            power_supply_unregister(&sbs->charger);
#endif
#ifdef CONFIG_ACPI_PROCFS_POWER
      if (sbs->charger_entry)
            acpi_sbs_remove_fs(&sbs->charger_entry, acpi_ac_dir);
#endif
}

void acpi_sbs_callback(void *context)
{
      int id;
      struct acpi_sbs *sbs = context;
      struct acpi_battery *bat;
      u8 saved_charger_state = sbs->charger_present;
      u8 saved_battery_state;
      acpi_ac_get_present(sbs);
      if (sbs->charger_present != saved_charger_state) {
#ifdef CONFIG_ACPI_PROC_EVENT
            acpi_bus_generate_proc_event4(ACPI_AC_CLASS, ACPI_AC_DIR_NAME,
                                    ACPI_SBS_NOTIFY_STATUS,
                                    sbs->charger_present);
#endif
#ifdef CONFIG_ACPI_SYSFS_POWER
            kobject_uevent(&sbs->charger.dev->kobj, KOBJ_CHANGE);
#endif
      }
      if (sbs->manager_present) {
            for (id = 0; id < MAX_SBS_BAT; ++id) {
                  if (!(sbs->batteries_supported & (1 << id)))
                        continue;
                  bat = &sbs->battery[id];
                  saved_battery_state = bat->present;
                  acpi_battery_read(bat);
                  if (saved_battery_state == bat->present)
                        continue;
#ifdef CONFIG_ACPI_PROC_EVENT
                  acpi_bus_generate_proc_event4(ACPI_BATTERY_CLASS,
                                          bat->name,
                                          ACPI_SBS_NOTIFY_STATUS,
                                          bat->present);
#endif
#ifdef CONFIG_ACPI_SYSFS_POWER
                  kobject_uevent(&bat->bat.dev->kobj, KOBJ_CHANGE);
#endif
            }
      }
}

static int acpi_sbs_remove(struct acpi_device *device, int type);

static int acpi_sbs_add(struct acpi_device *device)
{
      struct acpi_sbs *sbs;
      int result = 0;
      int id;

      sbs = kzalloc(sizeof(struct acpi_sbs), GFP_KERNEL);
      if (!sbs) {
            result = -ENOMEM;
            goto end;
      }

      mutex_init(&sbs->lock);

      sbs->hc = acpi_driver_data(device->parent);
      sbs->device = device;
      strcpy(acpi_device_name(device), ACPI_SBS_DEVICE_NAME);
      strcpy(acpi_device_class(device), ACPI_SBS_CLASS);
      acpi_driver_data(device) = sbs;

      result = acpi_charger_add(sbs);
      if (result)
            goto end;

      result = acpi_manager_get_info(sbs);
      if (!result) {
            sbs->manager_present = 1;
            for (id = 0; id < MAX_SBS_BAT; ++id)
                  if ((sbs->batteries_supported & (1 << id)))
                        acpi_battery_add(sbs, id);
      } else
            acpi_battery_add(sbs, 0);
      acpi_smbus_register_callback(sbs->hc, acpi_sbs_callback, sbs);
      end:
      if (result)
            acpi_sbs_remove(device, 0);
      return result;
}

static int acpi_sbs_remove(struct acpi_device *device, int type)
{
      struct acpi_sbs *sbs;
      int id;

      if (!device)
            return -EINVAL;
      sbs = acpi_driver_data(device);
      if (!sbs)
            return -EINVAL;
      mutex_lock(&sbs->lock);
      acpi_smbus_unregister_callback(sbs->hc);
      for (id = 0; id < MAX_SBS_BAT; ++id)
            acpi_battery_remove(sbs, id);
      acpi_charger_remove(sbs);
      mutex_unlock(&sbs->lock);
      mutex_destroy(&sbs->lock);
      kfree(sbs);
      return 0;
}

static void acpi_sbs_rmdirs(void)
{
#ifdef CONFIG_ACPI_PROCFS_POWER
      if (acpi_ac_dir) {
            acpi_unlock_ac_dir(acpi_ac_dir);
            acpi_ac_dir = NULL;
      }
      if (acpi_battery_dir) {
            acpi_unlock_battery_dir(acpi_battery_dir);
            acpi_battery_dir = NULL;
      }
#endif
}

static int acpi_sbs_resume(struct acpi_device *device)
{
      struct acpi_sbs *sbs;
      if (!device)
            return -EINVAL;
      sbs = device->driver_data;
      acpi_sbs_callback(sbs);
      return 0;
}

static struct acpi_driver acpi_sbs_driver = {
      .name = "sbs",
      .class = ACPI_SBS_CLASS,
      .ids = sbs_device_ids,
      .ops = {
            .add = acpi_sbs_add,
            .remove = acpi_sbs_remove,
            .resume = acpi_sbs_resume,
            },
};

static int __init acpi_sbs_init(void)
{
      int result = 0;

      if (acpi_disabled)
            return -ENODEV;
#ifdef CONFIG_ACPI_PROCFS_POWER
      acpi_ac_dir = acpi_lock_ac_dir();
      if (!acpi_ac_dir)
            return -ENODEV;
      acpi_battery_dir = acpi_lock_battery_dir();
      if (!acpi_battery_dir) {
            acpi_sbs_rmdirs();
            return -ENODEV;
      }
#endif
      result = acpi_bus_register_driver(&acpi_sbs_driver);
      if (result < 0) {
            acpi_sbs_rmdirs();
            return -ENODEV;
      }
      return 0;
}

static void __exit acpi_sbs_exit(void)
{
      acpi_bus_unregister_driver(&acpi_sbs_driver);
      acpi_sbs_rmdirs();
      return;
}

module_init(acpi_sbs_init);
module_exit(acpi_sbs_exit);

Generated by  Doxygen 1.6.0   Back to index