// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  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>
 */

#define pr_fmt(fmt) "ACPI: " fmt

#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>

#include <linux/acpi.h>
#include <linux/timer.h>
#include <linux/jiffies.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/platform_data/x86/apple.h>
#include <acpi/battery.h>

#include "sbshc.h"

#define ACPI_SBS_CLASS                  "sbs"
#define ACPI_AC_CLASS                   "ac_adapter"
#define ACPI_SBS_DEVICE_NAME            "Smart Battery System"
#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");

#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 {
        struct power_supply *bat;
        struct power_supply_desc bat_desc;
        struct acpi_sbs *sbs;
        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 rate_now;
        s16 rate_avg;
        u16 capacity_now;
        u16 state_of_charge;
        u16 state;
        u16 mode;
        u16 spec;
        u8 id;
        u8 present:1;
};

#define to_acpi_battery(x) power_supply_get_drvdata(x)

struct acpi_sbs {
        struct power_supply *charger;
        struct acpi_device *device;
        struct acpi_smb_hc *hc;
        struct mutex lock;
        struct acpi_battery battery[MAX_SBS_BAT];
        u8 batteries_supported:4;
        u8 manager_present:1;
        u8 charger_present:1;
        u8 charger_exists:1;
};

#define to_acpi_sbs(x) power_supply_get_drvdata(x)

static void acpi_sbs_remove(struct platform_device *pdev);
static int acpi_battery_get_state(struct acpi_battery *battery);

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);
}

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;

        acpi_battery_get_state(battery);
        switch (psp) {
        case POWER_SUPPLY_PROP_STATUS:
                if (battery->rate_now < 0)
                        val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
                else if (battery->rate_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_CYCLE_COUNT:
                val->intval = battery->cycle_count;
                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:
        case POWER_SUPPLY_PROP_POWER_NOW:
                val->intval = abs(battery->rate_now) *
                                acpi_battery_ipscale(battery) * 1000;
                val->intval *= (acpi_battery_mode(battery)) ?
                                (battery->voltage_now *
                                acpi_battery_vscale(battery) / 1000) : 1;
                break;
        case POWER_SUPPLY_PROP_CURRENT_AVG:
        case POWER_SUPPLY_PROP_POWER_AVG:
                val->intval = abs(battery->rate_avg) *
                                acpi_battery_ipscale(battery) * 1000;
                val->intval *= (acpi_battery_mode(battery)) ?
                                (battery->voltage_now *
                                acpi_battery_vscale(battery) / 1000) : 1;
                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 const enum power_supply_property sbs_ac_props[] = {
        POWER_SUPPLY_PROP_ONLINE,
};

static const enum power_supply_property sbs_charge_battery_props[] = {
        POWER_SUPPLY_PROP_STATUS,
        POWER_SUPPLY_PROP_PRESENT,
        POWER_SUPPLY_PROP_TECHNOLOGY,
        POWER_SUPPLY_PROP_CYCLE_COUNT,
        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 const 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_POWER_NOW,
        POWER_SUPPLY_PROP_POWER_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,
};

static const struct power_supply_desc acpi_sbs_charger_desc = {
        .name           = "sbs-charger",
        .type           = POWER_SUPPLY_TYPE_MAINS,
        .properties     = sbs_ac_props,
        .num_properties = ARRAY_SIZE(sbs_ac_props),
        .get_property   = sbs_get_ac_property,
};

/* --------------------------------------------------------------------------
                            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, rate_now)},
        {0x0b, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_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)
                return result;

        /*
         * The spec requires that bit 4 always be 1. If it's not set, assume
         * that the implementation doesn't support an SBS charger.
         *
         * And on some MacBooks a status of 0xffff is always returned, no
         * matter whether the charger is plugged in or not, which is also
         * wrong, so ignore the SBS charger for those too.
         */
        if (!((status >> 4) & 0x1) || status == 0xffff)
                return -ENODEV;

        sbs->charger_present = (status >> 15) & 0x1;
        return 0;
}

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, "%lu\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},
        .show = acpi_battery_alarm_show,
        .store = acpi_battery_alarm_store,
};

static struct attribute *acpi_battery_attrs[] = {
        &alarm_attr.attr,
        NULL
};
ATTRIBUTE_GROUPS(acpi_battery);

/* --------------------------------------------------------------------------
                                 Driver Interface
   -------------------------------------------------------------------------- */
static int acpi_battery_read(struct acpi_battery *battery)
{
        int result, 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)
                        return result;

                battery->present = !!(state & (1 << battery->id));
                if (!battery->present)
                        return 0;

                /* Masking necessary for Smart Battery Selectors */
                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;
                } else {
                        if (!battery->present)
                                return 0;
                }
        }

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

/* Smart Battery */
static int acpi_battery_add(struct acpi_sbs *sbs, int id)
{
        struct acpi_battery *battery = &sbs->battery[id];
        struct power_supply_config psy_cfg = {
                .drv_data = battery,
                .attr_grp = acpi_battery_groups,
        };
        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);
        battery->bat_desc.name = battery->name;
        battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY;
        if (!acpi_battery_mode(battery)) {
                battery->bat_desc.properties = sbs_charge_battery_props;
                battery->bat_desc.num_properties =
                    ARRAY_SIZE(sbs_charge_battery_props);
        } else {
                battery->bat_desc.properties = sbs_energy_battery_props;
                battery->bat_desc.num_properties =
                    ARRAY_SIZE(sbs_energy_battery_props);
        }
        battery->bat_desc.get_property = acpi_sbs_battery_get_property;
        battery->bat = power_supply_register(&sbs->device->dev,
                                        &battery->bat_desc, &psy_cfg);
        if (IS_ERR(battery->bat)) {
                result = PTR_ERR(battery->bat);
                battery->bat = NULL;
                goto end;
        }

      end:
        pr_info("%s [%s]: Battery Slot [%s] (battery %s)\n",
               ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
               battery->name, battery->present ? "present" : "absent");
        return result;
}

static void acpi_battery_remove(struct acpi_sbs *sbs, int id)
{
        struct acpi_battery *battery = &sbs->battery[id];

        if (battery->bat)
                power_supply_unregister(battery->bat);
}

static int acpi_charger_add(struct acpi_sbs *sbs)
{
        int result;
        struct power_supply_config psy_cfg = { .drv_data = sbs, };

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

        sbs->charger_exists = 1;
        sbs->charger = power_supply_register(&sbs->device->dev,
                                        &acpi_sbs_charger_desc, &psy_cfg);
        if (IS_ERR(sbs->charger)) {
                result = PTR_ERR(sbs->charger);
                sbs->charger = NULL;
        }
        pr_info("%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)
{
        if (sbs->charger)
                power_supply_unregister(sbs->charger);
}

static 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;

        if (sbs->charger_exists) {
                acpi_ac_get_present(sbs);
                if (sbs->charger_present != saved_charger_state)
                        power_supply_changed(sbs->charger);
        }

        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;
                        power_supply_changed(bat->bat);
                }
        }
}

static int acpi_sbs_probe(struct platform_device *pdev)
{
        struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
        struct acpi_sbs *sbs;
        int result = 0;
        int id;

        sbs = kzalloc_obj(struct acpi_sbs);
        if (!sbs) {
                result = -ENOMEM;
                goto end;
        }

        mutex_init(&sbs->lock);

        platform_set_drvdata(pdev, sbs);

        sbs->hc = dev_get_drvdata(pdev->dev.parent);
        sbs->device = device;
        strscpy(acpi_device_name(device), ACPI_SBS_DEVICE_NAME);
        strscpy(acpi_device_class(device), ACPI_SBS_CLASS);

        result = acpi_charger_add(sbs);
        if (result && result != -ENODEV)
                goto end;

        result = 0;

        if (!x86_apple_machine) {
                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);
                }
        }

        if (!sbs->manager_present)
                acpi_battery_add(sbs, 0);

        acpi_smbus_register_callback(sbs->hc, acpi_sbs_callback, sbs);
end:
        if (result)
                acpi_sbs_remove(pdev);
        return result;
}

static void acpi_sbs_remove(struct platform_device *pdev)
{
        struct acpi_sbs *sbs = platform_get_drvdata(pdev);
        int id;

        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);
}

#ifdef CONFIG_PM_SLEEP
static int acpi_sbs_resume(struct device *dev)
{
        acpi_sbs_callback(dev_get_drvdata(dev));
        return 0;
}
#else
#define acpi_sbs_resume NULL
#endif

static SIMPLE_DEV_PM_OPS(acpi_sbs_pm, NULL, acpi_sbs_resume);

static struct platform_driver acpi_sbs_driver = {
        .probe = acpi_sbs_probe,
        .remove = acpi_sbs_remove,
        .driver = {
                .name = "acpi-sbs",
                .acpi_match_table = sbs_device_ids,
                .pm = &acpi_sbs_pm,
        },
};

module_platform_driver(acpi_sbs_driver);