1 files changed, 354 insertions, 0 deletions

diff --git a/drivers/acpi/ac.c b/drivers/acpi/ac.c
new file mode 100644
index 000000000000..23ab761dd721
--- /dev/null
+++ b/drivers/acpi/ac.c
@@ -0,0 +1,354 @@
+/*
+ *  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);