/* * acpi_battery.c - ACPI Battery Driver ($Revision: 37 $) * * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or (at * your option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/types.h> #include <linux/proc_fs.h> #include <linux/seq_file.h> #include <asm/uaccess.h> #include <acpi/acpi_bus.h> #include <acpi/acpi_drivers.h> #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF #define ACPI_BATTERY_FORMAT_BIF "NNNNNNNNNSSSS" #define ACPI_BATTERY_FORMAT_BST "NNNN" #define ACPI_BATTERY_COMPONENT 0x00040000 #define ACPI_BATTERY_CLASS "battery" #define ACPI_BATTERY_HID "PNP0C0A" #define ACPI_BATTERY_DEVICE_NAME "Battery" #define ACPI_BATTERY_FILE_INFO "info" #define ACPI_BATTERY_FILE_STATUS "state" #define ACPI_BATTERY_FILE_ALARM "alarm" #define ACPI_BATTERY_NOTIFY_STATUS 0x80 #define ACPI_BATTERY_NOTIFY_INFO 0x81 #define ACPI_BATTERY_UNITS_WATTS "mW" #define ACPI_BATTERY_UNITS_AMPS "mA" #define _COMPONENT ACPI_BATTERY_COMPONENT ACPI_MODULE_NAME("battery"); MODULE_AUTHOR("Paul Diefenbaugh"); MODULE_DESCRIPTION("ACPI Battery Driver"); MODULE_LICENSE("GPL"); extern struct proc_dir_entry *acpi_lock_battery_dir(void); extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir); static int acpi_battery_add(struct acpi_device *device); static int acpi_battery_remove(struct acpi_device *device, int type); static int acpi_battery_resume(struct acpi_device *device); static struct acpi_driver acpi_battery_driver = { .name = "battery", .class = ACPI_BATTERY_CLASS, .ids = ACPI_BATTERY_HID, .ops = { .add = acpi_battery_add, .resume = acpi_battery_resume, .remove = acpi_battery_remove, }, }; struct acpi_battery_status { acpi_integer state; acpi_integer present_rate; acpi_integer remaining_capacity; acpi_integer present_voltage; }; struct acpi_battery_info { acpi_integer power_unit; acpi_integer design_capacity; acpi_integer last_full_capacity; acpi_integer battery_technology; acpi_integer design_voltage; acpi_integer design_capacity_warning; acpi_integer design_capacity_low; acpi_integer battery_capacity_granularity_1; acpi_integer battery_capacity_granularity_2; acpi_string model_number; acpi_string serial_number; acpi_string battery_type; acpi_string oem_info; }; struct acpi_battery_flags { u8 present:1; /* Bay occupied? */ u8 power_unit:1; /* 0=watts, 1=apms */ u8 alarm:1; /* _BTP present? */ u8 reserved:5; }; struct acpi_battery_trips { unsigned long warning; unsigned long low; }; struct acpi_battery { struct acpi_device * device; struct acpi_battery_flags flags; struct acpi_battery_trips trips; unsigned long alarm; struct acpi_battery_info *info; }; /* -------------------------------------------------------------------------- Battery Management -------------------------------------------------------------------------- */ static int acpi_battery_get_info(struct acpi_battery *battery, struct acpi_battery_info **bif) { int result = 0; acpi_status status = 0; struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; struct acpi_buffer format = { sizeof(ACPI_BATTERY_FORMAT_BIF), ACPI_BATTERY_FORMAT_BIF }; struct acpi_buffer data = { 0, NULL }; union acpi_object *package = NULL; if (!battery || !bif) return -EINVAL; /* Evalute _BIF */ status = acpi_evaluate_object(battery->device->handle, "_BIF", NULL, &buffer); if (ACPI_FAILURE(status)) { ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BIF")); return -ENODEV; } package = buffer.pointer; /* Extract Package Data */ status = acpi_extract_package(package, &format, &data); if (status != AE_BUFFER_OVERFLOW) { ACPI_EXCEPTION((AE_INFO, status, "Extracting _BIF")); result = -ENODEV; goto end; } data.pointer = kzalloc(data.length, GFP_KERNEL); if (!data.pointer) { result = -ENOMEM; goto end; } status = acpi_extract_package(package, &format, &data); if (ACPI_FAILURE(status)) { ACPI_EXCEPTION((AE_INFO, status, "Extracting _BIF")); kfree(data.pointer); result = -ENODEV; goto end; } end: kfree(buffer.pointer); if (!result) (*bif) = data.pointer; return result; } static int acpi_battery_get_status(struct acpi_battery *battery, struct acpi_battery_status **bst) { int result = 0; acpi_status status = 0; struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; struct acpi_buffer format = { sizeof(ACPI_BATTERY_FORMAT_BST), ACPI_BATTERY_FORMAT_BST }; struct acpi_buffer data = { 0, NULL }; union acpi_object *package = NULL; if (!battery || !bst) return -EINVAL; /* Evalute _BST */ status = acpi_evaluate_object(battery->device->handle, "_BST", NULL, &buffer); if (ACPI_FAILURE(status)) { ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST")); return -ENODEV; } package = buffer.pointer; /* Extract Package Data */ status = acpi_extract_package(package, &format, &data); if (status != AE_BUFFER_OVERFLOW) { ACPI_EXCEPTION((AE_INFO, status, "Extracting _BST")); result = -ENODEV; goto end; } data.pointer = kzalloc(data.length, GFP_KERNEL); if (!data.pointer) { result = -ENOMEM; goto end; } status = acpi_extract_package(package, &format, &data); if (ACPI_FAILURE(status)) { ACPI_EXCEPTION((AE_INFO, status, "Extracting _BST")); kfree(data.pointer); result = -ENODEV; goto end; } end: kfree(buffer.pointer); if (!result) (*bst) = data.pointer; return result; } static int acpi_battery_set_alarm(struct acpi_battery *battery, unsigned long alarm) { acpi_status status = 0; union acpi_object arg0 = { ACPI_TYPE_INTEGER }; struct acpi_object_list arg_list = { 1, &arg0 }; if (!battery) return -EINVAL; if (!battery->flags.alarm) return -ENODEV; arg0.integer.value = alarm; status = acpi_evaluate_object(battery->device->handle, "_BTP", &arg_list, NULL); if (ACPI_FAILURE(status)) return -ENODEV; ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", (u32) alarm)); battery->alarm = alarm; return 0; } static int acpi_battery_check(struct acpi_battery *battery) { int result = 0; acpi_status status = AE_OK; acpi_handle handle = NULL; struct acpi_device *device = NULL; struct acpi_battery_info *bif = NULL; if (!battery) return -EINVAL; device = battery->device; result = acpi_bus_get_status(device); if (result) return result; /* Insertion? */ if (!battery->flags.present && device->status.battery_present) { ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Battery inserted\n")); /* Evalute _BIF to get certain static information */ result = acpi_battery_get_info(battery, &bif); if (result) return result; battery->flags.power_unit = bif->power_unit; battery->trips.warning = bif->design_capacity_warning; battery->trips.low = bif->design_capacity_low; kfree(bif); /* See if alarms are supported, and if so, set default */ status = acpi_get_handle(battery->device->handle, "_BTP", &handle); if (ACPI_SUCCESS(status)) { battery->flags.alarm = 1; acpi_battery_set_alarm(battery, battery->trips.warning); } } /* Removal? */ else if (battery->flags.present && !device->status.battery_present) { ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Battery removed\n")); } battery->flags.present = device->status.battery_present; return result; } static void acpi_battery_check_present(struct acpi_battery *battery) { if (!battery->flags.present) { acpi_battery_check(battery); } } /* -------------------------------------------------------------------------- FS Interface (/proc) -------------------------------------------------------------------------- */ static struct proc_dir_entry *acpi_battery_dir; static int acpi_battery_read_info(struct seq_file *seq, void *offset) { int result = 0; struct acpi_battery *battery = seq->private; struct acpi_battery_info *bif = NULL; char *units = "?"; if (!battery) goto end; acpi_battery_check_present(battery); if (battery->flags.present) seq_printf(seq, "present: yes\n"); else { seq_printf(seq, "present: no\n"); goto end; } /* Battery Info (_BIF) */ result = acpi_battery_get_info(battery, &bif); if (result || !bif) { seq_printf(seq, "ERROR: Unable to read battery information\n"); goto end; } units = bif-> power_unit ? ACPI_BATTERY_UNITS_AMPS : ACPI_BATTERY_UNITS_WATTS; if (bif->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN) seq_printf(seq, "design capacity: unknown\n"); else seq_printf(seq, "design capacity: %d %sh\n", (u32) bif->design_capacity, units); if (bif->last_full_capacity == ACPI_BATTERY_VALUE_UNKNOWN) seq_printf(seq, "last full capacity: unknown\n"); else seq_printf(seq, "last full capacity: %d %sh\n", (u32) bif->last_full_capacity, units); switch ((u32) bif->battery_technology) { case 0: seq_printf(seq, "battery technology: non-rechargeable\n"); break; case 1: seq_printf(seq, "battery technology: rechargeable\n"); break; default: seq_printf(seq, "battery technology: unknown\n"); break; } if (bif->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN) seq_printf(seq, "design voltage: unknown\n"); else seq_printf(seq, "design voltage: %d mV\n", (u32) bif->design_voltage); seq_printf(seq, "design capacity warning: %d %sh\n", (u32) bif->design_capacity_warning, units); seq_printf(seq, "design capacity low: %d %sh\n", (u32) bif->design_capacity_low, units); seq_printf(seq, "capacity granularity 1: %d %sh\n", (u32) bif->battery_capacity_granularity_1, units); seq_printf(seq, "capacity granularity 2: %d %sh\n", (u32) bif->battery_capacity_granularity_2, units); seq_printf(seq, "model number: %s\n", bif->model_number); seq_printf(seq, "serial number: %s\n", bif->serial_number); seq_printf(seq, "battery type: %s\n", bif->battery_type); seq_printf(seq, "OEM info: %s\n", bif->oem_info); end: kfree(bif); return 0; } 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) { int result = 0; struct acpi_battery *battery = seq->private; struct acpi_battery_status *bst = NULL; char *units = "?"; if (!battery) goto end; acpi_battery_check_present(battery); if (battery->flags.present) seq_printf(seq, "present: yes\n"); else { seq_printf(seq, "present: no\n"); goto end; } /* Battery Units */ units = battery->flags. power_unit ? ACPI_BATTERY_UNITS_AMPS : ACPI_BATTERY_UNITS_WATTS; /* Battery Status (_BST) */ result = acpi_battery_get_status(battery, &bst); if (result || !bst) { seq_printf(seq, "ERROR: Unable to read battery status\n"); goto end; } if (!(bst->state & 0x04)) seq_printf(seq, "capacity state: ok\n"); else seq_printf(seq, "capacity state: critical\n"); if ((bst->state & 0x01) && (bst->state & 0x02)) { seq_printf(seq, "charging state: charging/discharging\n"); } else if (bst->state & 0x01) seq_printf(seq, "charging state: discharging\n"); else if (bst->state & 0x02) seq_printf(seq, "charging state: charging\n"); else { seq_printf(seq, "charging state: charged\n"); } if (bst->present_rate == ACPI_BATTERY_VALUE_UNKNOWN) seq_printf(seq, "present rate: unknown\n"); else seq_printf(seq, "present rate: %d %s\n", (u32) bst->present_rate, units); if (bst->remaining_capacity == ACPI_BATTERY_VALUE_UNKNOWN) seq_printf(seq, "remaining capacity: unknown\n"); else seq_printf(seq, "remaining capacity: %d %sh\n", (u32) bst->remaining_capacity, units); if (bst->present_voltage == ACPI_BATTERY_VALUE_UNKNOWN) seq_printf(seq, "present voltage: unknown\n"); else seq_printf(seq, "present voltage: %d mV\n", (u32) bst->present_voltage); end: kfree(bst); 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; char *units = "?"; if (!battery) goto end; acpi_battery_check_present(battery); if (!battery->flags.present) { seq_printf(seq, "present: no\n"); goto end; } /* Battery Units */ units = battery->flags. power_unit ? ACPI_BATTERY_UNITS_AMPS : ACPI_BATTERY_UNITS_WATTS; /* Battery Alarm */ seq_printf(seq, "alarm: "); if (!battery->alarm) seq_printf(seq, "unsupported\n"); else seq_printf(seq, "%d %sh\n", (u32) battery->alarm, units); end: return 0; } 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; acpi_battery_check_present(battery); if (!battery->flags.present) return -ENODEV; if (copy_from_user(alarm_string, buffer, count)) return -EFAULT; alarm_string[count] = '\0'; result = acpi_battery_set_alarm(battery, simple_strtoul(alarm_string, NULL, 0)); 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 const struct file_operations acpi_battery_info_ops = { .open = acpi_battery_info_open_fs, .read = seq_read, .llseek = seq_lseek, .release = single_release, .owner = THIS_MODULE, }; static const struct file_operations acpi_battery_state_ops = { .open = acpi_battery_state_open_fs, .read = seq_read, .llseek = seq_lseek, .release = single_release, .owner = THIS_MODULE, }; static const struct file_operations acpi_battery_alarm_ops = { .open = acpi_battery_alarm_open_fs, .read = seq_read, .write = acpi_battery_write_alarm, .llseek = seq_lseek, .release = single_release, .owner = THIS_MODULE, }; static int acpi_battery_add_fs(struct acpi_device *device) { struct proc_dir_entry *entry = NULL; 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; } /* 'info' [R] */ entry = create_proc_entry(ACPI_BATTERY_FILE_INFO, S_IRUGO, acpi_device_dir(device)); if (!entry) return -ENODEV; else { entry->proc_fops = &acpi_battery_info_ops; entry->data = acpi_driver_data(device); entry->owner = THIS_MODULE; } /* 'status' [R] */ entry = create_proc_entry(ACPI_BATTERY_FILE_STATUS, S_IRUGO, acpi_device_dir(device)); if (!entry) return -ENODEV; else { entry->proc_fops = &acpi_battery_state_ops; entry->data = acpi_driver_data(device); entry->owner = THIS_MODULE; } /* 'alarm' [R/W] */ entry = create_proc_entry(ACPI_BATTERY_FILE_ALARM, S_IFREG | S_IRUGO | S_IWUSR, acpi_device_dir(device)); if (!entry) return -ENODEV; else { entry->proc_fops = &acpi_battery_alarm_ops; entry->data = acpi_driver_data(device); entry->owner = THIS_MODULE; } return 0; } static int acpi_battery_remove_fs(struct acpi_device *device) { if (acpi_device_dir(device)) { remove_proc_entry(ACPI_BATTERY_FILE_ALARM, acpi_device_dir(device)); remove_proc_entry(ACPI_BATTERY_FILE_STATUS, acpi_device_dir(device)); remove_proc_entry(ACPI_BATTERY_FILE_INFO, acpi_device_dir(device)); remove_proc_entry(acpi_device_bid(device), acpi_battery_dir); acpi_device_dir(device) = NULL; } return 0; } /* -------------------------------------------------------------------------- Driver Interface -------------------------------------------------------------------------- */ static void acpi_battery_notify(acpi_handle handle, u32 event, void *data) { struct acpi_battery *battery = data; struct acpi_device *device = NULL; if (!battery) return; device = battery->device; switch (event) { case ACPI_BATTERY_NOTIFY_STATUS: case ACPI_BATTERY_NOTIFY_INFO: case ACPI_NOTIFY_BUS_CHECK: case ACPI_NOTIFY_DEVICE_CHECK: acpi_battery_check(battery); acpi_bus_generate_event(device, event, battery->flags.present); break; default: ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Unsupported event [0x%x]\n", event)); break; } return; } 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; result = acpi_battery_check(battery); if (result) goto end; result = acpi_battery_add_fs(device); if (result) goto end; status = acpi_install_notify_handler(device->handle, ACPI_ALL_NOTIFY, acpi_battery_notify, battery); if (ACPI_FAILURE(status)) { 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) { acpi_battery_remove_fs(device); 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); acpi_battery_remove_fs(device); 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 = device->driver_data; return acpi_battery_check(battery); } static int __init acpi_battery_init(void) { int result; if (acpi_disabled) return -ENODEV; acpi_battery_dir = acpi_lock_battery_dir(); if (!acpi_battery_dir) return -ENODEV; result = acpi_bus_register_driver(&acpi_battery_driver); if (result < 0) { acpi_unlock_battery_dir(acpi_battery_dir); return -ENODEV; } return 0; } static void __exit acpi_battery_exit(void) { acpi_bus_unregister_driver(&acpi_battery_driver); acpi_unlock_battery_dir(acpi_battery_dir); return; } module_init(acpi_battery_init); module_exit(acpi_battery_exit);