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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 | ||
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 | |
46 | ||
47 | #define _COMPONENT ACPI_AC_COMPONENT | |
48 | ACPI_MODULE_NAME ("acpi_ac") | |
49 | ||
50 | MODULE_AUTHOR("Paul Diefenbaugh"); | |
51 | MODULE_DESCRIPTION(ACPI_AC_DRIVER_NAME); | |
52 | MODULE_LICENSE("GPL"); | |
53 | ||
54 | static int acpi_ac_add (struct acpi_device *device); | |
55 | static int acpi_ac_remove (struct acpi_device *device, int type); | |
56 | static int acpi_ac_open_fs(struct inode *inode, struct file *file); | |
57 | ||
58 | static struct acpi_driver acpi_ac_driver = { | |
59 | .name = ACPI_AC_DRIVER_NAME, | |
60 | .class = ACPI_AC_CLASS, | |
61 | .ids = ACPI_AC_HID, | |
62 | .ops = { | |
63 | .add = acpi_ac_add, | |
64 | .remove = acpi_ac_remove, | |
65 | }, | |
66 | }; | |
67 | ||
68 | struct acpi_ac { | |
69 | acpi_handle handle; | |
70 | unsigned long state; | |
71 | }; | |
72 | ||
73 | static struct file_operations acpi_ac_fops = { | |
74 | .open = acpi_ac_open_fs, | |
75 | .read = seq_read, | |
76 | .llseek = seq_lseek, | |
77 | .release = single_release, | |
78 | }; | |
79 | ||
80 | /* -------------------------------------------------------------------------- | |
81 | AC Adapter Management | |
82 | -------------------------------------------------------------------------- */ | |
83 | ||
84 | static int | |
85 | acpi_ac_get_state ( | |
86 | struct acpi_ac *ac) | |
87 | { | |
88 | acpi_status status = AE_OK; | |
89 | ||
90 | ACPI_FUNCTION_TRACE("acpi_ac_get_state"); | |
91 | ||
92 | if (!ac) | |
93 | return_VALUE(-EINVAL); | |
94 | ||
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); | |
101 | } | |
102 | ||
103 | return_VALUE(0); | |
104 | } | |
105 | ||
106 | ||
107 | /* -------------------------------------------------------------------------- | |
108 | FS Interface (/proc) | |
109 | -------------------------------------------------------------------------- */ | |
110 | ||
111 | static struct proc_dir_entry *acpi_ac_dir; | |
112 | ||
113 | static int acpi_ac_seq_show(struct seq_file *seq, void *offset) | |
114 | { | |
115 | struct acpi_ac *ac = (struct acpi_ac *) seq->private; | |
116 | ||
117 | ACPI_FUNCTION_TRACE("acpi_ac_seq_show"); | |
118 | ||
119 | if (!ac) | |
120 | return_VALUE(0); | |
121 | ||
122 | if (acpi_ac_get_state(ac)) { | |
123 | seq_puts(seq, "ERROR: Unable to read AC Adapter state\n"); | |
124 | return_VALUE(0); | |
125 | } | |
126 | ||
127 | seq_puts(seq, "state: "); | |
128 | switch (ac->state) { | |
129 | case ACPI_AC_STATUS_OFFLINE: | |
130 | seq_puts(seq, "off-line\n"); | |
131 | break; | |
132 | case ACPI_AC_STATUS_ONLINE: | |
133 | seq_puts(seq, "on-line\n"); | |
134 | break; | |
135 | default: | |
136 | seq_puts(seq, "unknown\n"); | |
137 | break; | |
138 | } | |
139 | ||
140 | return_VALUE(0); | |
141 | } | |
142 | ||
143 | static int acpi_ac_open_fs(struct inode *inode, struct file *file) | |
144 | { | |
145 | return single_open(file, acpi_ac_seq_show, PDE(inode)->data); | |
146 | } | |
147 | ||
148 | static int | |
149 | acpi_ac_add_fs ( | |
150 | struct acpi_device *device) | |
151 | { | |
152 | struct proc_dir_entry *entry = NULL; | |
153 | ||
154 | ACPI_FUNCTION_TRACE("acpi_ac_add_fs"); | |
155 | ||
156 | if (!acpi_device_dir(device)) { | |
157 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
158 | acpi_ac_dir); | |
159 | if (!acpi_device_dir(device)) | |
160 | return_VALUE(-ENODEV); | |
161 | acpi_device_dir(device)->owner = THIS_MODULE; | |
162 | } | |
163 | ||
164 | /* 'state' [R] */ | |
165 | entry = create_proc_entry(ACPI_AC_FILE_STATE, | |
166 | S_IRUGO, acpi_device_dir(device)); | |
167 | if (!entry) | |
168 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
169 | "Unable to create '%s' fs entry\n", | |
170 | ACPI_AC_FILE_STATE)); | |
171 | else { | |
172 | entry->proc_fops = &acpi_ac_fops; | |
173 | entry->data = acpi_driver_data(device); | |
174 | entry->owner = THIS_MODULE; | |
175 | } | |
176 | ||
177 | return_VALUE(0); | |
178 | } | |
179 | ||
180 | ||
181 | static int | |
182 | acpi_ac_remove_fs ( | |
183 | struct acpi_device *device) | |
184 | { | |
185 | ACPI_FUNCTION_TRACE("acpi_ac_remove_fs"); | |
186 | ||
187 | if (acpi_device_dir(device)) { | |
188 | remove_proc_entry(ACPI_AC_FILE_STATE, | |
189 | acpi_device_dir(device)); | |
190 | ||
191 | remove_proc_entry(acpi_device_bid(device), acpi_ac_dir); | |
192 | acpi_device_dir(device) = NULL; | |
193 | } | |
194 | ||
195 | return_VALUE(0); | |
196 | } | |
197 | ||
198 | ||
199 | /* -------------------------------------------------------------------------- | |
200 | Driver Model | |
201 | -------------------------------------------------------------------------- */ | |
202 | ||
203 | static void | |
204 | acpi_ac_notify ( | |
205 | acpi_handle handle, | |
206 | u32 event, | |
207 | void *data) | |
208 | { | |
209 | struct acpi_ac *ac = (struct acpi_ac *) data; | |
210 | struct acpi_device *device = NULL; | |
211 | ||
212 | ACPI_FUNCTION_TRACE("acpi_ac_notify"); | |
213 | ||
214 | if (!ac) | |
215 | return_VOID; | |
216 | ||
217 | if (acpi_bus_get_device(ac->handle, &device)) | |
218 | return_VOID; | |
219 | ||
220 | switch (event) { | |
221 | case ACPI_AC_NOTIFY_STATUS: | |
222 | acpi_ac_get_state(ac); | |
223 | acpi_bus_generate_event(device, event, (u32) ac->state); | |
224 | break; | |
225 | default: | |
226 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
227 | "Unsupported event [0x%x]\n", event)); | |
228 | break; | |
229 | } | |
230 | ||
231 | return_VOID; | |
232 | } | |
233 | ||
234 | ||
235 | static int | |
236 | acpi_ac_add ( | |
237 | struct acpi_device *device) | |
238 | { | |
239 | int result = 0; | |
240 | acpi_status status = AE_OK; | |
241 | struct acpi_ac *ac = NULL; | |
242 | ||
243 | ACPI_FUNCTION_TRACE("acpi_ac_add"); | |
244 | ||
245 | if (!device) | |
246 | return_VALUE(-EINVAL); | |
247 | ||
248 | ac = kmalloc(sizeof(struct acpi_ac), GFP_KERNEL); | |
249 | if (!ac) | |
250 | return_VALUE(-ENOMEM); | |
251 | memset(ac, 0, sizeof(struct acpi_ac)); | |
252 | ||
253 | ac->handle = device->handle; | |
254 | strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME); | |
255 | strcpy(acpi_device_class(device), ACPI_AC_CLASS); | |
256 | acpi_driver_data(device) = ac; | |
257 | ||
258 | result = acpi_ac_get_state(ac); | |
259 | if (result) | |
260 | goto end; | |
261 | ||
262 | result = acpi_ac_add_fs(device); | |
263 | if (result) | |
264 | goto end; | |
265 | ||
266 | status = acpi_install_notify_handler(ac->handle, | |
267 | ACPI_DEVICE_NOTIFY, acpi_ac_notify, ac); | |
268 | if (ACPI_FAILURE(status)) { | |
269 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
270 | "Error installing notify handler\n")); | |
271 | result = -ENODEV; | |
272 | goto end; | |
273 | } | |
274 | ||
275 | printk(KERN_INFO PREFIX "%s [%s] (%s)\n", | |
276 | acpi_device_name(device), acpi_device_bid(device), | |
277 | ac->state?"on-line":"off-line"); | |
278 | ||
279 | end: | |
280 | if (result) { | |
281 | acpi_ac_remove_fs(device); | |
282 | kfree(ac); | |
283 | } | |
284 | ||
285 | return_VALUE(result); | |
286 | } | |
287 | ||
288 | ||
289 | static int | |
290 | acpi_ac_remove ( | |
291 | struct acpi_device *device, | |
292 | int type) | |
293 | { | |
294 | acpi_status status = AE_OK; | |
295 | struct acpi_ac *ac = NULL; | |
296 | ||
297 | ACPI_FUNCTION_TRACE("acpi_ac_remove"); | |
298 | ||
299 | if (!device || !acpi_driver_data(device)) | |
300 | return_VALUE(-EINVAL); | |
301 | ||
302 | ac = (struct acpi_ac *) acpi_driver_data(device); | |
303 | ||
304 | status = acpi_remove_notify_handler(ac->handle, | |
305 | ACPI_DEVICE_NOTIFY, acpi_ac_notify); | |
306 | if (ACPI_FAILURE(status)) | |
307 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
308 | "Error removing notify handler\n")); | |
309 | ||
310 | acpi_ac_remove_fs(device); | |
311 | ||
312 | kfree(ac); | |
313 | ||
314 | return_VALUE(0); | |
315 | } | |
316 | ||
317 | ||
318 | static int __init | |
319 | acpi_ac_init (void) | |
320 | { | |
321 | int result = 0; | |
322 | ||
323 | ACPI_FUNCTION_TRACE("acpi_ac_init"); | |
324 | ||
325 | acpi_ac_dir = proc_mkdir(ACPI_AC_CLASS, acpi_root_dir); | |
326 | if (!acpi_ac_dir) | |
327 | return_VALUE(-ENODEV); | |
328 | acpi_ac_dir->owner = THIS_MODULE; | |
329 | ||
330 | result = acpi_bus_register_driver(&acpi_ac_driver); | |
331 | if (result < 0) { | |
332 | remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir); | |
333 | return_VALUE(-ENODEV); | |
334 | } | |
335 | ||
336 | return_VALUE(0); | |
337 | } | |
338 | ||
339 | ||
340 | static void __exit | |
341 | acpi_ac_exit (void) | |
342 | { | |
343 | ACPI_FUNCTION_TRACE("acpi_ac_exit"); | |
344 | ||
345 | acpi_bus_unregister_driver(&acpi_ac_driver); | |
346 | ||
347 | remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir); | |
348 | ||
349 | return_VOID; | |
350 | } | |
351 | ||
352 | ||
353 | module_init(acpi_ac_init); | |
354 | module_exit(acpi_ac_exit); |