2 * acpi_ac.c - ACPI AC Adapter Driver ($Revision: 27 $)
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or (at
12 * your option) any later version.
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
26 #include <linux/kernel.h>
27 #include <linux/module.h>
28 #include <linux/init.h>
29 #include <linux/types.h>
30 #include <linux/proc_fs.h>
31 #include <linux/seq_file.h>
32 #include <acpi/acpi_bus.h>
33 #include <acpi/acpi_drivers.h>
36 #define ACPI_AC_COMPONENT 0x00020000
37 #define ACPI_AC_CLASS "ac_adapter"
38 #define ACPI_AC_HID "ACPI0003"
39 #define ACPI_AC_DRIVER_NAME "ACPI AC Adapter Driver"
40 #define ACPI_AC_DEVICE_NAME "AC Adapter"
41 #define ACPI_AC_FILE_STATE "state"
42 #define ACPI_AC_NOTIFY_STATUS 0x80
43 #define ACPI_AC_STATUS_OFFLINE 0x00
44 #define ACPI_AC_STATUS_ONLINE 0x01
45 #define ACPI_AC_STATUS_UNKNOWN 0xFF
47 #define _COMPONENT ACPI_AC_COMPONENT
48 ACPI_MODULE_NAME ("acpi_ac")
50 MODULE_AUTHOR("Paul Diefenbaugh");
51 MODULE_DESCRIPTION(ACPI_AC_DRIVER_NAME);
52 MODULE_LICENSE("GPL");
54 int acpi_ac_add (struct acpi_device *device);
55 int acpi_ac_remove (struct acpi_device *device, int type);
56 static int acpi_ac_open_fs(struct inode *inode, struct file *file);
58 static struct acpi_driver acpi_ac_driver = {
59 .name = ACPI_AC_DRIVER_NAME,
60 .class = ACPI_AC_CLASS,
64 .remove = acpi_ac_remove,
73 static struct file_operations acpi_ac_fops = {
74 .open = acpi_ac_open_fs,
77 .release = single_release,
80 /* --------------------------------------------------------------------------
82 -------------------------------------------------------------------------- */
88 acpi_status status = AE_OK;
90 ACPI_FUNCTION_TRACE("acpi_ac_get_state");
93 return_VALUE(-EINVAL);
95 status = acpi_evaluate_integer(ac->handle, "_PSR", NULL, &ac->state);
96 if (ACPI_FAILURE(status)) {
97 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
98 "Error reading AC Adapter state\n"));
99 ac->state = ACPI_AC_STATUS_UNKNOWN;
100 return_VALUE(-ENODEV);
107 /* --------------------------------------------------------------------------
109 -------------------------------------------------------------------------- */
111 struct proc_dir_entry *acpi_ac_dir;
113 int acpi_ac_seq_show(struct seq_file *seq, void *offset)
115 struct acpi_ac *ac = (struct acpi_ac *) seq->private;
117 ACPI_FUNCTION_TRACE("acpi_ac_seq_show");
122 if (acpi_ac_get_state(ac)) {
123 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
127 seq_puts(seq, "state: ");
129 case ACPI_AC_STATUS_OFFLINE:
130 seq_puts(seq, "off-line\n");
132 case ACPI_AC_STATUS_ONLINE:
133 seq_puts(seq, "on-line\n");
136 seq_puts(seq, "unknown\n");
143 static int acpi_ac_open_fs(struct inode *inode, struct file *file)
145 return single_open(file, acpi_ac_seq_show, PDE(inode)->data);
150 struct acpi_device *device)
152 struct proc_dir_entry *entry = NULL;
154 ACPI_FUNCTION_TRACE("acpi_ac_add_fs");
156 if (!acpi_device_dir(device)) {
157 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
159 if (!acpi_device_dir(device))
160 return_VALUE(-ENODEV);
161 acpi_device_dir(device)->owner = THIS_MODULE;
165 entry = create_proc_entry(ACPI_AC_FILE_STATE,
166 S_IRUGO, acpi_device_dir(device));
168 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
169 "Unable to create '%s' fs entry\n",
170 ACPI_AC_FILE_STATE));
172 entry->proc_fops = &acpi_ac_fops;
173 entry->data = acpi_driver_data(device);
174 entry->owner = THIS_MODULE;
183 struct acpi_device *device)
185 ACPI_FUNCTION_TRACE("acpi_ac_remove_fs");
187 if (acpi_device_dir(device)) {
188 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
189 acpi_device_dir(device) = NULL;
196 /* --------------------------------------------------------------------------
198 -------------------------------------------------------------------------- */
206 struct acpi_ac *ac = (struct acpi_ac *) data;
207 struct acpi_device *device = NULL;
209 ACPI_FUNCTION_TRACE("acpi_ac_notify");
214 if (acpi_bus_get_device(ac->handle, &device))
218 case ACPI_AC_NOTIFY_STATUS:
219 acpi_ac_get_state(ac);
220 acpi_bus_generate_event(device, event, (u32) ac->state);
223 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
224 "Unsupported event [0x%x]\n", event));
234 struct acpi_device *device)
237 acpi_status status = AE_OK;
238 struct acpi_ac *ac = NULL;
240 ACPI_FUNCTION_TRACE("acpi_ac_add");
243 return_VALUE(-EINVAL);
245 ac = kmalloc(sizeof(struct acpi_ac), GFP_KERNEL);
247 return_VALUE(-ENOMEM);
248 memset(ac, 0, sizeof(struct acpi_ac));
250 ac->handle = device->handle;
251 strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
252 strcpy(acpi_device_class(device), ACPI_AC_CLASS);
253 acpi_driver_data(device) = ac;
255 result = acpi_ac_get_state(ac);
259 result = acpi_ac_add_fs(device);
263 status = acpi_install_notify_handler(ac->handle,
264 ACPI_DEVICE_NOTIFY, acpi_ac_notify, ac);
265 if (ACPI_FAILURE(status)) {
266 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
267 "Error installing notify handler\n"));
272 printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
273 acpi_device_name(device), acpi_device_bid(device),
274 ac->state?"on-line":"off-line");
278 acpi_ac_remove_fs(device);
282 return_VALUE(result);
288 struct acpi_device *device,
291 acpi_status status = AE_OK;
292 struct acpi_ac *ac = NULL;
294 ACPI_FUNCTION_TRACE("acpi_ac_remove");
296 if (!device || !acpi_driver_data(device))
297 return_VALUE(-EINVAL);
299 ac = (struct acpi_ac *) acpi_driver_data(device);
301 status = acpi_remove_notify_handler(ac->handle,
302 ACPI_DEVICE_NOTIFY, acpi_ac_notify);
303 if (ACPI_FAILURE(status))
304 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
305 "Error removing notify handler\n"));
307 acpi_ac_remove_fs(device);
320 ACPI_FUNCTION_TRACE("acpi_ac_init");
322 acpi_ac_dir = proc_mkdir(ACPI_AC_CLASS, acpi_root_dir);
324 return_VALUE(-ENODEV);
325 acpi_ac_dir->owner = THIS_MODULE;
327 result = acpi_bus_register_driver(&acpi_ac_driver);
329 remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir);
330 return_VALUE(-ENODEV);
340 ACPI_FUNCTION_TRACE("acpi_ac_exit");
342 acpi_bus_unregister_driver(&acpi_ac_driver);
344 remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir);
350 module_init(acpi_ac_init);
351 module_exit(acpi_ac_exit);