/* * acpi_ac.c - ACPI AC Adapter Driver ($Revision: 27 $) * * 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/slab.h> #include <linux/init.h> #include <linux/types.h> #ifdef CONFIG_ACPI_PROCFS_POWER #include <linux/proc_fs.h> #include <linux/seq_file.h> #endif #ifdef CONFIG_ACPI_SYSFS_POWER #include <linux/power_supply.h> #endif #include <acpi/acpi_bus.h> #include <acpi/acpi_drivers.h> #define PREFIX "ACPI: " #define ACPI_AC_CLASS "ac_adapter" #define ACPI_AC_DEVICE_NAME "AC Adapter" #define ACPI_AC_FILE_STATE "state" #define ACPI_AC_NOTIFY_STATUS 0x80 #define ACPI_AC_STATUS_OFFLINE 0x00 #define ACPI_AC_STATUS_ONLINE 0x01 #define ACPI_AC_STATUS_UNKNOWN 0xFF #define _COMPONENT ACPI_AC_COMPONENT ACPI_MODULE_NAME("ac"); MODULE_AUTHOR("Paul Diefenbaugh"); MODULE_DESCRIPTION("ACPI AC Adapter Driver"); MODULE_LICENSE("GPL"); #ifdef CONFIG_ACPI_PROCFS_POWER extern struct proc_dir_entry *acpi_lock_ac_dir(void); extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir); static int acpi_ac_open_fs(struct inode *inode, struct file *file); #endif static int acpi_ac_add(struct acpi_device *device); static int acpi_ac_remove(struct acpi_device *device, int type); static int acpi_ac_resume(struct acpi_device *device); static void acpi_ac_notify(struct acpi_device *device, u32 event); static const struct acpi_device_id ac_device_ids[] = { {"ACPI0003", 0}, {"", 0}, }; MODULE_DEVICE_TABLE(acpi, ac_device_ids); static struct acpi_driver acpi_ac_driver = { .name = "ac", .class = ACPI_AC_CLASS, .ids = ac_device_ids, .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS, .ops = { .add = acpi_ac_add, .remove = acpi_ac_remove, .resume = acpi_ac_resume, .notify = acpi_ac_notify, }, }; struct acpi_ac { #ifdef CONFIG_ACPI_SYSFS_POWER struct power_supply charger; #endif struct acpi_device * device; unsigned long long state; }; #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger); #ifdef CONFIG_ACPI_PROCFS_POWER static const struct file_operations acpi_ac_fops = { .owner = THIS_MODULE, .open = acpi_ac_open_fs, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; #endif #ifdef CONFIG_ACPI_SYSFS_POWER static int get_ac_property(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) { struct acpi_ac *ac = to_acpi_ac(psy); switch (psp) { case POWER_SUPPLY_PROP_ONLINE: val->intval = ac->state; break; default: return -EINVAL; } return 0; } static enum power_supply_property ac_props[] = { POWER_SUPPLY_PROP_ONLINE, }; #endif /* -------------------------------------------------------------------------- AC Adapter Management -------------------------------------------------------------------------- */ static int acpi_ac_get_state(struct acpi_ac *ac) { acpi_status status = AE_OK; if (!ac) return -EINVAL; status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state); if (ACPI_FAILURE(status)) { ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state")); ac->state = ACPI_AC_STATUS_UNKNOWN; return -ENODEV; } return 0; } #ifdef CONFIG_ACPI_PROCFS_POWER /* -------------------------------------------------------------------------- FS Interface (/proc) -------------------------------------------------------------------------- */ static struct proc_dir_entry *acpi_ac_dir; static int acpi_ac_seq_show(struct seq_file *seq, void *offset) { struct acpi_ac *ac = seq->private; if (!ac) return 0; if (acpi_ac_get_state(ac)) { seq_puts(seq, "ERROR: Unable to read AC Adapter state\n"); return 0; } seq_puts(seq, "state: "); switch (ac->state) { case ACPI_AC_STATUS_OFFLINE: seq_puts(seq, "off-line\n"); break; case ACPI_AC_STATUS_ONLINE: seq_puts(seq, "on-line\n"); break; default: seq_puts(seq, "unknown\n"); break; } return 0; } static int acpi_ac_open_fs(struct inode *inode, struct file *file) { return single_open(file, acpi_ac_seq_show, PDE(inode)->data); } static int acpi_ac_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_ac_dir); if (!acpi_device_dir(device)) return -ENODEV; } /* 'state' [R] */ entry = proc_create_data(ACPI_AC_FILE_STATE, S_IRUGO, acpi_device_dir(device), &acpi_ac_fops, acpi_driver_data(device)); if (!entry) return -ENODEV; return 0; } static int acpi_ac_remove_fs(struct acpi_device *device) { if (acpi_device_dir(device)) { remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device)); remove_proc_entry(acpi_device_bid(device), acpi_ac_dir); acpi_device_dir(device) = NULL; } return 0; } #endif /* -------------------------------------------------------------------------- Driver Model -------------------------------------------------------------------------- */ static void acpi_ac_notify(struct acpi_device *device, u32 event) { struct acpi_ac *ac = acpi_driver_data(device); if (!ac) return; switch (event) { default: ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Unsupported event [0x%x]\n", event)); case ACPI_AC_NOTIFY_STATUS: case ACPI_NOTIFY_BUS_CHECK: case ACPI_NOTIFY_DEVICE_CHECK: acpi_ac_get_state(ac); acpi_bus_generate_proc_event(device, event, (u32) ac->state); acpi_bus_generate_netlink_event(device->pnp.device_class, dev_name(&device->dev), event, (u32) ac->state); acpi_notifier_call_chain(device, event, (u32) ac->state); #ifdef CONFIG_ACPI_SYSFS_POWER kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE); #endif } return; } static int acpi_ac_add(struct acpi_device *device) { int result = 0; struct acpi_ac *ac = NULL; if (!device) return -EINVAL; ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL); if (!ac) return -ENOMEM; ac->device = device; strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME); strcpy(acpi_device_class(device), ACPI_AC_CLASS); device->driver_data = ac; result = acpi_ac_get_state(ac); if (result) goto end; #ifdef CONFIG_ACPI_PROCFS_POWER result = acpi_ac_add_fs(device); #endif if (result) goto end; #ifdef CONFIG_ACPI_SYSFS_POWER ac->charger.name = acpi_device_bid(device); ac->charger.type = POWER_SUPPLY_TYPE_MAINS; ac->charger.properties = ac_props; ac->charger.num_properties = ARRAY_SIZE(ac_props); ac->charger.get_property = get_ac_property; power_supply_register(&ac->device->dev, &ac->charger); #endif printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device), acpi_device_bid(device), ac->state ? "on-line" : "off-line"); end: if (result) { #ifdef CONFIG_ACPI_PROCFS_POWER acpi_ac_remove_fs(device); #endif kfree(ac); } return result; } static int acpi_ac_resume(struct acpi_device *device) { struct acpi_ac *ac; unsigned old_state; if (!device || !acpi_driver_data(device)) return -EINVAL; ac = acpi_driver_data(device); old_state = ac->state; if (acpi_ac_get_state(ac)) return 0; #ifdef CONFIG_ACPI_SYSFS_POWER if (old_state != ac->state) kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE); #endif return 0; } static int acpi_ac_remove(struct acpi_device *device, int type) { struct acpi_ac *ac = NULL; if (!device || !acpi_driver_data(device)) return -EINVAL; ac = acpi_driver_data(device); #ifdef CONFIG_ACPI_SYSFS_POWER if (ac->charger.dev) power_supply_unregister(&ac->charger); #endif #ifdef CONFIG_ACPI_PROCFS_POWER acpi_ac_remove_fs(device); #endif kfree(ac); return 0; } static int __init acpi_ac_init(void) { int result; if (acpi_disabled) return -ENODEV; #ifdef CONFIG_ACPI_PROCFS_POWER acpi_ac_dir = acpi_lock_ac_dir(); if (!acpi_ac_dir) return -ENODEV; #endif result = acpi_bus_register_driver(&acpi_ac_driver); if (result < 0) { #ifdef CONFIG_ACPI_PROCFS_POWER acpi_unlock_ac_dir(acpi_ac_dir); #endif return -ENODEV; } return 0; } static void __exit acpi_ac_exit(void) { acpi_bus_unregister_driver(&acpi_ac_driver); #ifdef CONFIG_ACPI_PROCFS_POWER acpi_unlock_ac_dir(acpi_ac_dir); #endif return; } module_init(acpi_ac_init); module_exit(acpi_ac_exit);