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linux-sg2042/drivers/acpi/ac.c

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/*
* 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/init.h>
#include <linux/types.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#define ACPI_AC_COMPONENT 0x00020000
#define ACPI_AC_CLASS "ac_adapter"
#define ACPI_AC_HID "ACPI0003"
#define ACPI_AC_DRIVER_NAME "ACPI AC Adapter Driver"
#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 ("acpi_ac")
MODULE_AUTHOR("Paul Diefenbaugh");
MODULE_DESCRIPTION(ACPI_AC_DRIVER_NAME);
MODULE_LICENSE("GPL");
static int acpi_ac_add (struct acpi_device *device);
static int acpi_ac_remove (struct acpi_device *device, int type);
static int acpi_ac_open_fs(struct inode *inode, struct file *file);
static struct acpi_driver acpi_ac_driver = {
.name = ACPI_AC_DRIVER_NAME,
.class = ACPI_AC_CLASS,
.ids = ACPI_AC_HID,
.ops = {
.add = acpi_ac_add,
.remove = acpi_ac_remove,
},
};
struct acpi_ac {
acpi_handle handle;
unsigned long state;
};
static struct file_operations acpi_ac_fops = {
.open = acpi_ac_open_fs,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
/* --------------------------------------------------------------------------
AC Adapter Management
-------------------------------------------------------------------------- */
static int
acpi_ac_get_state (
struct acpi_ac *ac)
{
acpi_status status = AE_OK;
ACPI_FUNCTION_TRACE("acpi_ac_get_state");
if (!ac)
return_VALUE(-EINVAL);
status = acpi_evaluate_integer(ac->handle, "_PSR", NULL, &ac->state);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Error reading AC Adapter state\n"));
ac->state = ACPI_AC_STATUS_UNKNOWN;
return_VALUE(-ENODEV);
}
return_VALUE(0);
}
/* --------------------------------------------------------------------------
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 = (struct acpi_ac *) seq->private;
ACPI_FUNCTION_TRACE("acpi_ac_seq_show");
if (!ac)
return_VALUE(0);
if (acpi_ac_get_state(ac)) {
seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
return_VALUE(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_VALUE(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;
ACPI_FUNCTION_TRACE("acpi_ac_add_fs");
if (!acpi_device_dir(device)) {
acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
acpi_ac_dir);
if (!acpi_device_dir(device))
return_VALUE(-ENODEV);
acpi_device_dir(device)->owner = THIS_MODULE;
}
/* 'state' [R] */
entry = create_proc_entry(ACPI_AC_FILE_STATE,
S_IRUGO, acpi_device_dir(device));
if (!entry)
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Unable to create '%s' fs entry\n",
ACPI_AC_FILE_STATE));
else {
entry->proc_fops = &acpi_ac_fops;
entry->data = acpi_driver_data(device);
entry->owner = THIS_MODULE;
}
return_VALUE(0);
}
static int
acpi_ac_remove_fs (
struct acpi_device *device)
{
ACPI_FUNCTION_TRACE("acpi_ac_remove_fs");
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_VALUE(0);
}
/* --------------------------------------------------------------------------
Driver Model
-------------------------------------------------------------------------- */
static void
acpi_ac_notify (
acpi_handle handle,
u32 event,
void *data)
{
struct acpi_ac *ac = (struct acpi_ac *) data;
struct acpi_device *device = NULL;
ACPI_FUNCTION_TRACE("acpi_ac_notify");
if (!ac)
return_VOID;
if (acpi_bus_get_device(ac->handle, &device))
return_VOID;
switch (event) {
case ACPI_AC_NOTIFY_STATUS:
acpi_ac_get_state(ac);
acpi_bus_generate_event(device, event, (u32) ac->state);
break;
default:
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Unsupported event [0x%x]\n", event));
break;
}
return_VOID;
}
static int
acpi_ac_add (
struct acpi_device *device)
{
int result = 0;
acpi_status status = AE_OK;
struct acpi_ac *ac = NULL;
ACPI_FUNCTION_TRACE("acpi_ac_add");
if (!device)
return_VALUE(-EINVAL);
ac = kmalloc(sizeof(struct acpi_ac), GFP_KERNEL);
if (!ac)
return_VALUE(-ENOMEM);
memset(ac, 0, sizeof(struct acpi_ac));
ac->handle = device->handle;
strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
strcpy(acpi_device_class(device), ACPI_AC_CLASS);
acpi_driver_data(device) = ac;
result = acpi_ac_get_state(ac);
if (result)
goto end;
result = acpi_ac_add_fs(device);
if (result)
goto end;
status = acpi_install_notify_handler(ac->handle,
ACPI_DEVICE_NOTIFY, acpi_ac_notify, ac);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Error installing notify handler\n"));
result = -ENODEV;
goto end;
}
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) {
acpi_ac_remove_fs(device);
kfree(ac);
}
return_VALUE(result);
}
static int
acpi_ac_remove (
struct acpi_device *device,
int type)
{
acpi_status status = AE_OK;
struct acpi_ac *ac = NULL;
ACPI_FUNCTION_TRACE("acpi_ac_remove");
if (!device || !acpi_driver_data(device))
return_VALUE(-EINVAL);
ac = (struct acpi_ac *) acpi_driver_data(device);
status = acpi_remove_notify_handler(ac->handle,
ACPI_DEVICE_NOTIFY, acpi_ac_notify);
if (ACPI_FAILURE(status))
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Error removing notify handler\n"));
acpi_ac_remove_fs(device);
kfree(ac);
return_VALUE(0);
}
static int __init
acpi_ac_init (void)
{
int result = 0;
ACPI_FUNCTION_TRACE("acpi_ac_init");
acpi_ac_dir = proc_mkdir(ACPI_AC_CLASS, acpi_root_dir);
if (!acpi_ac_dir)
return_VALUE(-ENODEV);
acpi_ac_dir->owner = THIS_MODULE;
result = acpi_bus_register_driver(&acpi_ac_driver);
if (result < 0) {
remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir);
return_VALUE(-ENODEV);
}
return_VALUE(0);
}
static void __exit
acpi_ac_exit (void)
{
ACPI_FUNCTION_TRACE("acpi_ac_exit");
acpi_bus_unregister_driver(&acpi_ac_driver);
remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir);
return_VOID;
}
module_init(acpi_ac_init);
module_exit(acpi_ac_exit);
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