1 /*
2 * acpi_ac.c - ACPI AC Adapter Driver ($Revision: 27 $)
3 *
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6 *
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8 *
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.
13 *
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.
18 *
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.
22 *
23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
24 */
25
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>
34
35 #define ACPI_AC_COMPONENT 0x00020000
36 #define ACPI_AC_CLASS "ac_adapter"
37 #define ACPI_AC_HID "ACPI0003"
38 #define ACPI_AC_DRIVER_NAME "ACPI AC Adapter Driver"
39 #define ACPI_AC_DEVICE_NAME "AC Adapter"
40 #define ACPI_AC_FILE_STATE "state"
41 #define ACPI_AC_NOTIFY_STATUS 0x80
42 #define ACPI_AC_STATUS_OFFLINE 0x00
43 #define ACPI_AC_STATUS_ONLINE 0x01
44 #define ACPI_AC_STATUS_UNKNOWN 0xFF
45
46 #define _COMPONENT ACPI_AC_COMPONENT
47 ACPI_MODULE_NAME("acpi_ac")
48
49 MODULE_AUTHOR("Paul Diefenbaugh");
50 MODULE_DESCRIPTION(ACPI_AC_DRIVER_NAME);
51 MODULE_LICENSE("GPL");
52
53 extern struct proc_dir_entry *acpi_lock_ac_dir(void);
54 extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
55
56 static int acpi_ac_add(struct acpi_device *device);
57 static int acpi_ac_remove(struct acpi_device *device, int type);
58 static int acpi_ac_open_fs(struct inode *inode, struct file *file);
59
60 static struct acpi_driver acpi_ac_driver = {
61 .name = ACPI_AC_DRIVER_NAME,
62 .class = ACPI_AC_CLASS,
63 .ids = ACPI_AC_HID,
64 .ops = {
65 .add = acpi_ac_add,
66 .remove = acpi_ac_remove,
67 },
68 };
69
70 struct acpi_ac {
71 struct acpi_device * device;
72 unsigned long state;
73 };
74
75 static const struct file_operations acpi_ac_fops = {
76 .open = acpi_ac_open_fs,
77 .read = seq_read,
78 .llseek = seq_lseek,
79 .release = single_release,
80 };
81
82 /* --------------------------------------------------------------------------
83 AC Adapter Management
84 -------------------------------------------------------------------------- */
85
86 static int acpi_ac_get_state(struct acpi_ac *ac)
87 {
88 acpi_status status = AE_OK;
89
90
91 if (!ac)
92 return -EINVAL;
93
94 status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state);
95 if (ACPI_FAILURE(status)) {
96 ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state"));
97 ac->state = ACPI_AC_STATUS_UNKNOWN;
98 return -ENODEV;
99 }
100
101 return 0;
102 }
103
104 /* --------------------------------------------------------------------------
105 FS Interface (/proc)
106 -------------------------------------------------------------------------- */
107
108 static struct proc_dir_entry *acpi_ac_dir;
109
110 static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
111 {
112 struct acpi_ac *ac = (struct acpi_ac *)seq->private;
113
114
115 if (!ac)
116 return 0;
117
118 if (acpi_ac_get_state(ac)) {
119 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
120 return 0;
121 }
122
123 seq_puts(seq, "state: ");
124 switch (ac->state) {
125 case ACPI_AC_STATUS_OFFLINE:
126 seq_puts(seq, "off-line\n");
127 break;
128 case ACPI_AC_STATUS_ONLINE:
129 seq_puts(seq, "on-line\n");
130 break;
131 default:
132 seq_puts(seq, "unknown\n");
133 break;
134 }
135
136 return 0;
137 }
138
139 static int acpi_ac_open_fs(struct inode *inode, struct file *file)
140 {
141 return single_open(file, acpi_ac_seq_show, PDE(inode)->data);
142 }
143
144 static int acpi_ac_add_fs(struct acpi_device *device)
145 {
146 struct proc_dir_entry *entry = NULL;
147
148
149 if (!acpi_device_dir(device)) {
150 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
151 acpi_ac_dir);
152 if (!acpi_device_dir(device))
153 return -ENODEV;
154 acpi_device_dir(device)->owner = THIS_MODULE;
155 }
156
157 /* 'state' [R] */
158 entry = create_proc_entry(ACPI_AC_FILE_STATE,
159 S_IRUGO, acpi_device_dir(device));
160 if (!entry)
161 return -ENODEV;
162 else {
163 entry->proc_fops = &acpi_ac_fops;
164 entry->data = acpi_driver_data(device);
165 entry->owner = THIS_MODULE;
166 }
167
168 return 0;
169 }
170
171 static int acpi_ac_remove_fs(struct acpi_device *device)
172 {
173
174 if (acpi_device_dir(device)) {
175 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device));
176
177 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
178 acpi_device_dir(device) = NULL;
179 }
180
181 return 0;
182 }
183
184 /* --------------------------------------------------------------------------
185 Driver Model
186 -------------------------------------------------------------------------- */
187
188 static void acpi_ac_notify(acpi_handle handle, u32 event, void *data)
189 {
190 struct acpi_ac *ac = (struct acpi_ac *)data;
191 struct acpi_device *device = NULL;
192
193
194 if (!ac)
195 return;
196
197 device = ac->device;
198 switch (event) {
199 case ACPI_AC_NOTIFY_STATUS:
200 case ACPI_NOTIFY_BUS_CHECK:
201 case ACPI_NOTIFY_DEVICE_CHECK:
202 acpi_ac_get_state(ac);
203 acpi_bus_generate_event(device, event, (u32) ac->state);
204 break;
205 default:
206 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
207 "Unsupported event [0x%x]\n", event));
208 break;
209 }
210
211 return;
212 }
213
214 static int acpi_ac_add(struct acpi_device *device)
215 {
216 int result = 0;
217 acpi_status status = AE_OK;
218 struct acpi_ac *ac = NULL;
219
220
221 if (!device)
222 return -EINVAL;
223
224 ac = kmalloc(sizeof(struct acpi_ac), GFP_KERNEL);
225 if (!ac)
226 return -ENOMEM;
227 memset(ac, 0, sizeof(struct acpi_ac));
228
229 ac->device = device;
230 strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
231 strcpy(acpi_device_class(device), ACPI_AC_CLASS);
232 acpi_driver_data(device) = ac;
233
234 result = acpi_ac_get_state(ac);
235 if (result)
236 goto end;
237
238 result = acpi_ac_add_fs(device);
239 if (result)
240 goto end;
241
242 status = acpi_install_notify_handler(device->handle,
243 ACPI_ALL_NOTIFY, acpi_ac_notify,
244 ac);
245 if (ACPI_FAILURE(status)) {
246 result = -ENODEV;
247 goto end;
248 }
249
250 printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
251 acpi_device_name(device), acpi_device_bid(device),
252 ac->state ? "on-line" : "off-line");
253
254 end:
255 if (result) {
256 acpi_ac_remove_fs(device);
257 kfree(ac);
258 }
259
260 return result;
261 }
262
263 static int acpi_ac_remove(struct acpi_device *device, int type)
264 {
265 acpi_status status = AE_OK;
266 struct acpi_ac *ac = NULL;
267
268
269 if (!device || !acpi_driver_data(device))
270 return -EINVAL;
271
272 ac = (struct acpi_ac *)acpi_driver_data(device);
273
274 status = acpi_remove_notify_handler(device->handle,
275 ACPI_ALL_NOTIFY, acpi_ac_notify);
276
277 acpi_ac_remove_fs(device);
278
279 kfree(ac);
280
281 return 0;
282 }
283
284 static int __init acpi_ac_init(void)
285 {
286 int result;
287
288 if (acpi_disabled)
289 return -ENODEV;
290
291 acpi_ac_dir = acpi_lock_ac_dir();
292 if (!acpi_ac_dir)
293 return -ENODEV;
294
295 result = acpi_bus_register_driver(&acpi_ac_driver);
296 if (result < 0) {
297 acpi_unlock_ac_dir(acpi_ac_dir);
298 return -ENODEV;
299 }
300
301 return 0;
302 }
303
304 static void __exit acpi_ac_exit(void)
305 {
306
307 acpi_bus_unregister_driver(&acpi_ac_driver);
308
309 acpi_unlock_ac_dir(acpi_ac_dir);
310
311 return;
312 }
313
314 module_init(acpi_ac_init);
315 module_exit(acpi_ac_exit);
316
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