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328 lines
8.0 KiB
328 lines
8.0 KiB
/*
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* acpi_ac.c - ACPI AC Adapter Driver ($Revision: 27 $)
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*
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* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
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* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/acpi_drivers.h>
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#define ACPI_AC_COMPONENT 0x00020000
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#define ACPI_AC_CLASS "ac_adapter"
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#define ACPI_AC_HID "ACPI0003"
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#define ACPI_AC_DRIVER_NAME "ACPI AC Adapter Driver"
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#define ACPI_AC_DEVICE_NAME "AC Adapter"
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#define ACPI_AC_FILE_STATE "state"
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#define ACPI_AC_NOTIFY_STATUS 0x80
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#define ACPI_AC_STATUS_OFFLINE 0x00
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#define ACPI_AC_STATUS_ONLINE 0x01
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#define ACPI_AC_STATUS_UNKNOWN 0xFF
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#define _COMPONENT ACPI_AC_COMPONENT
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ACPI_MODULE_NAME("acpi_ac")
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MODULE_AUTHOR("Paul Diefenbaugh");
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MODULE_DESCRIPTION(ACPI_AC_DRIVER_NAME);
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MODULE_LICENSE("GPL");
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static int acpi_ac_add(struct acpi_device *device);
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static int acpi_ac_remove(struct acpi_device *device, int type);
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static int acpi_ac_open_fs(struct inode *inode, struct file *file);
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static struct acpi_driver acpi_ac_driver = {
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.name = ACPI_AC_DRIVER_NAME,
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.class = ACPI_AC_CLASS,
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.ids = ACPI_AC_HID,
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.ops = {
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.add = acpi_ac_add,
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.remove = acpi_ac_remove,
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},
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};
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struct acpi_ac {
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acpi_handle handle;
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unsigned long state;
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};
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static struct file_operations acpi_ac_fops = {
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.open = acpi_ac_open_fs,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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/* --------------------------------------------------------------------------
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AC Adapter Management
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-------------------------------------------------------------------------- */
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static int acpi_ac_get_state(struct acpi_ac *ac)
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{
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acpi_status status = AE_OK;
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ACPI_FUNCTION_TRACE("acpi_ac_get_state");
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if (!ac)
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return_VALUE(-EINVAL);
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status = acpi_evaluate_integer(ac->handle, "_PSR", NULL, &ac->state);
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if (ACPI_FAILURE(status)) {
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
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"Error reading AC Adapter state\n"));
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ac->state = ACPI_AC_STATUS_UNKNOWN;
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return_VALUE(-ENODEV);
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}
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return_VALUE(0);
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}
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/* --------------------------------------------------------------------------
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FS Interface (/proc)
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-------------------------------------------------------------------------- */
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static struct proc_dir_entry *acpi_ac_dir;
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static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
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{
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struct acpi_ac *ac = (struct acpi_ac *)seq->private;
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ACPI_FUNCTION_TRACE("acpi_ac_seq_show");
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if (!ac)
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return_VALUE(0);
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if (acpi_ac_get_state(ac)) {
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seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
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return_VALUE(0);
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}
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seq_puts(seq, "state: ");
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switch (ac->state) {
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case ACPI_AC_STATUS_OFFLINE:
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seq_puts(seq, "off-line\n");
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break;
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case ACPI_AC_STATUS_ONLINE:
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seq_puts(seq, "on-line\n");
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break;
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default:
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seq_puts(seq, "unknown\n");
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break;
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}
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return_VALUE(0);
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}
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static int acpi_ac_open_fs(struct inode *inode, struct file *file)
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{
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return single_open(file, acpi_ac_seq_show, PDE(inode)->data);
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}
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static int acpi_ac_add_fs(struct acpi_device *device)
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{
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struct proc_dir_entry *entry = NULL;
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ACPI_FUNCTION_TRACE("acpi_ac_add_fs");
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if (!acpi_device_dir(device)) {
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acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
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acpi_ac_dir);
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if (!acpi_device_dir(device))
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return_VALUE(-ENODEV);
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acpi_device_dir(device)->owner = THIS_MODULE;
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}
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/* 'state' [R] */
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entry = create_proc_entry(ACPI_AC_FILE_STATE,
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S_IRUGO, acpi_device_dir(device));
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if (!entry)
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
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"Unable to create '%s' fs entry\n",
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ACPI_AC_FILE_STATE));
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else {
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entry->proc_fops = &acpi_ac_fops;
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entry->data = acpi_driver_data(device);
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entry->owner = THIS_MODULE;
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}
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return_VALUE(0);
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}
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static int acpi_ac_remove_fs(struct acpi_device *device)
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{
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ACPI_FUNCTION_TRACE("acpi_ac_remove_fs");
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if (acpi_device_dir(device)) {
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remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device));
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remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
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acpi_device_dir(device) = NULL;
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}
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return_VALUE(0);
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}
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/* --------------------------------------------------------------------------
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Driver Model
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-------------------------------------------------------------------------- */
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static void acpi_ac_notify(acpi_handle handle, u32 event, void *data)
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{
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struct acpi_ac *ac = (struct acpi_ac *)data;
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struct acpi_device *device = NULL;
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ACPI_FUNCTION_TRACE("acpi_ac_notify");
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if (!ac)
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return_VOID;
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if (acpi_bus_get_device(ac->handle, &device))
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return_VOID;
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switch (event) {
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case ACPI_AC_NOTIFY_STATUS:
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acpi_ac_get_state(ac);
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acpi_bus_generate_event(device, event, (u32) ac->state);
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break;
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default:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Unsupported event [0x%x]\n", event));
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break;
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}
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return_VOID;
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}
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static int acpi_ac_add(struct acpi_device *device)
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{
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int result = 0;
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acpi_status status = AE_OK;
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struct acpi_ac *ac = NULL;
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ACPI_FUNCTION_TRACE("acpi_ac_add");
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if (!device)
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return_VALUE(-EINVAL);
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ac = kmalloc(sizeof(struct acpi_ac), GFP_KERNEL);
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if (!ac)
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return_VALUE(-ENOMEM);
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memset(ac, 0, sizeof(struct acpi_ac));
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ac->handle = device->handle;
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strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
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strcpy(acpi_device_class(device), ACPI_AC_CLASS);
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acpi_driver_data(device) = ac;
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result = acpi_ac_get_state(ac);
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if (result)
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goto end;
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result = acpi_ac_add_fs(device);
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if (result)
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goto end;
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status = acpi_install_notify_handler(ac->handle,
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ACPI_DEVICE_NOTIFY, acpi_ac_notify,
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ac);
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if (ACPI_FAILURE(status)) {
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
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"Error installing notify handler\n"));
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result = -ENODEV;
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goto end;
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}
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printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
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acpi_device_name(device), acpi_device_bid(device),
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ac->state ? "on-line" : "off-line");
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end:
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if (result) {
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acpi_ac_remove_fs(device);
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kfree(ac);
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}
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return_VALUE(result);
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}
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static int acpi_ac_remove(struct acpi_device *device, int type)
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{
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acpi_status status = AE_OK;
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struct acpi_ac *ac = NULL;
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ACPI_FUNCTION_TRACE("acpi_ac_remove");
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if (!device || !acpi_driver_data(device))
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return_VALUE(-EINVAL);
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ac = (struct acpi_ac *)acpi_driver_data(device);
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status = acpi_remove_notify_handler(ac->handle,
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ACPI_DEVICE_NOTIFY, acpi_ac_notify);
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if (ACPI_FAILURE(status))
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
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"Error removing notify handler\n"));
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acpi_ac_remove_fs(device);
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kfree(ac);
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return_VALUE(0);
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}
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static int __init acpi_ac_init(void)
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{
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int result = 0;
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ACPI_FUNCTION_TRACE("acpi_ac_init");
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acpi_ac_dir = proc_mkdir(ACPI_AC_CLASS, acpi_root_dir);
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if (!acpi_ac_dir)
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return_VALUE(-ENODEV);
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acpi_ac_dir->owner = THIS_MODULE;
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result = acpi_bus_register_driver(&acpi_ac_driver);
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if (result < 0) {
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remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir);
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return_VALUE(-ENODEV);
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}
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return_VALUE(0);
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}
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static void __exit acpi_ac_exit(void)
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{
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ACPI_FUNCTION_TRACE("acpi_ac_exit");
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acpi_bus_unregister_driver(&acpi_ac_driver);
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remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir);
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return_VOID;
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}
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module_init(acpi_ac_init);
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module_exit(acpi_ac_exit);
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