| /* |
| * 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 |
| #include <linux/power_supply.h> |
| #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 { |
| struct power_supply charger; |
| 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 |
| |
| /* -------------------------------------------------------------------------- |
| 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; |
| } |
| |
| /* -------------------------------------------------------------------------- |
| sysfs I/F |
| -------------------------------------------------------------------------- */ |
| 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); |
| |
| if (!ac) |
| return -ENODEV; |
| |
| if (acpi_ac_get_state(ac)) |
| return -ENODEV; |
| |
| 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, |
| }; |
| |
| #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); |
| kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE); |
| } |
| |
| 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; |
| 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); |
| |
| 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; |
| if (old_state != ac->state) |
| kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE); |
| 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); |
| |
| if (ac->charger.dev) |
| power_supply_unregister(&ac->charger); |
| #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); |