diff options
Diffstat (limited to 'drivers/acpi/sbs.c')
| -rw-r--r-- | drivers/acpi/sbs.c | 736 |
1 files changed, 736 insertions, 0 deletions
diff --git a/drivers/acpi/sbs.c b/drivers/acpi/sbs.c new file mode 100644 index 000000000..e6d9f4de2 --- /dev/null +++ b/drivers/acpi/sbs.c @@ -0,0 +1,736 @@ +// 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> + */ + +#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/power_supply.h> +#include <linux/platform_data/x86/apple.h> +#include <acpi/battery.h> + +#include "sbshc.h" + +#define PREFIX "ACPI: " + +#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; + u8 have_sysfs_alarm: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 int acpi_sbs_remove(struct acpi_device *device); +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 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_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 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 const struct device_attribute alarm_attr = { + .attr = {.name = "alarm", .mode = 0644}, + .show = acpi_battery_alarm_show, + .store = acpi_battery_alarm_store, +}; + +/* -------------------------------------------------------------------------- + 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) { + 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, }; + 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; + } + + result = device_create_file(&battery->bat->dev, &alarm_attr); + if (result) + goto end; + battery->have_sysfs_alarm = 1; + end: + printk(KERN_INFO PREFIX "%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) { + if (battery->have_sysfs_alarm) + device_remove_file(&battery->bat->dev, &alarm_attr); + 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; + } + 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) +{ + 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) + kobject_uevent(&sbs->charger->dev.kobj, KOBJ_CHANGE); + } + + 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; + kobject_uevent(&bat->bat->dev.kobj, KOBJ_CHANGE); + } + } +} + +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); + device->driver_data = sbs; + + 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(device); + return result; +} + +static int acpi_sbs_remove(struct acpi_device *device) +{ + 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; +} + +#ifdef CONFIG_PM_SLEEP +static int acpi_sbs_resume(struct device *dev) +{ + struct acpi_sbs *sbs; + if (!dev) + return -EINVAL; + sbs = to_acpi_device(dev)->driver_data; + acpi_sbs_callback(sbs); + return 0; +} +#else +#define acpi_sbs_resume NULL +#endif + +static SIMPLE_DEV_PM_OPS(acpi_sbs_pm, NULL, acpi_sbs_resume); + +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, + }, + .drv.pm = &acpi_sbs_pm, +}; + +static int __init acpi_sbs_init(void) +{ + int result = 0; + + if (acpi_disabled) + return -ENODEV; + + result = acpi_bus_register_driver(&acpi_sbs_driver); + if (result < 0) + return -ENODEV; + + return 0; +} + +static void __exit acpi_sbs_exit(void) +{ + acpi_bus_unregister_driver(&acpi_sbs_driver); + return; +} + +module_init(acpi_sbs_init); +module_exit(acpi_sbs_exit); |