/* * battery.c - ACPI Battery Driver (Revision: 2.0) * * Copyright (C) 2007 Alexey Starikovskiy * Copyright (C) 2004-2007 Vladimir Lebedev * Copyright (C) 2001, 2002 Andy Grover * Copyright (C) 2001, 2002 Paul Diefenbaugh * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * * 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 #include #include #include #include #ifdef CONFIG_ACPI_PROCFS #include #include #include #endif #include #include #include #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 "); 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 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; struct power_supply bat; 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; } 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 (!strcasecmp("LI-ION", battery->type)) return POWER_SUPPLY_TECHNOLOGY_LION; if (!strcasecmp("LiP", battery->type)) return POWER_SUPPLY_TECHNOLOGY_LIPO; return POWER_SUPPLY_TECHNOLOGY_UNKNOWN; } static int acpi_battery_update(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)) && psp != POWER_SUPPLY_PROP_PRESENT) return -ENODEV; acpi_battery_update(battery); 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; 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, }; #ifdef CONFIG_ACPI_PROCFS 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); } 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; battery->update_time = 0; result = acpi_battery_get_info(battery); acpi_battery_init_alarm(battery); if (result) return 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); } static int acpi_battery_update(struct acpi_battery *battery) { int result = acpi_battery_get_status(battery); if (result) return result; if (!acpi_battery_present(battery)) { sysfs_remove_battery(battery); return 0; } if (!battery->bat.dev) sysfs_add_battery(battery); return acpi_battery_get_state(battery); } /* -------------------------------------------------------------------------- FS Interface (/proc) -------------------------------------------------------------------------- */ #ifdef CONFIG_ACPI_PROCFS 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)); /* acpi_batter_update could remove power_supply object */ if (battery->bat.dev) kobject_uevent(&battery->bat.dev->kobj, KOBJ_CHANGE); } 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 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 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 acpi_battery_remove_fs(device); #endif sysfs_remove_battery(battery); 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 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 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 acpi_unlock_battery_dir(acpi_battery_dir); #endif } module_init(acpi_battery_init); module_exit(acpi_battery_exit);