[PATCH] Fix /proc/acpi/events around suspend
[linux-2.6] / drivers / acpi / button.c
1 /*
2  *  acpi_button.c - ACPI Button Driver ($Revision: 30 $)
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_BUTTON_COMPONENT           0x00080000
36 #define ACPI_BUTTON_DRIVER_NAME         "ACPI Button Driver"
37 #define ACPI_BUTTON_CLASS               "button"
38 #define ACPI_BUTTON_FILE_INFO           "info"
39 #define ACPI_BUTTON_FILE_STATE          "state"
40 #define ACPI_BUTTON_TYPE_UNKNOWN        0x00
41 #define ACPI_BUTTON_NOTIFY_STATUS       0x80
42
43 #define ACPI_BUTTON_SUBCLASS_POWER      "power"
44 #define ACPI_BUTTON_HID_POWER           "PNP0C0C"
45 #define ACPI_BUTTON_DEVICE_NAME_POWER   "Power Button (CM)"
46 #define ACPI_BUTTON_DEVICE_NAME_POWERF  "Power Button (FF)"
47 #define ACPI_BUTTON_TYPE_POWER          0x01
48 #define ACPI_BUTTON_TYPE_POWERF         0x02
49
50 #define ACPI_BUTTON_SUBCLASS_SLEEP      "sleep"
51 #define ACPI_BUTTON_HID_SLEEP           "PNP0C0E"
52 #define ACPI_BUTTON_DEVICE_NAME_SLEEP   "Sleep Button (CM)"
53 #define ACPI_BUTTON_DEVICE_NAME_SLEEPF  "Sleep Button (FF)"
54 #define ACPI_BUTTON_TYPE_SLEEP          0x03
55 #define ACPI_BUTTON_TYPE_SLEEPF         0x04
56
57 #define ACPI_BUTTON_SUBCLASS_LID        "lid"
58 #define ACPI_BUTTON_HID_LID             "PNP0C0D"
59 #define ACPI_BUTTON_DEVICE_NAME_LID     "Lid Switch"
60 #define ACPI_BUTTON_TYPE_LID            0x05
61
62 #define _COMPONENT              ACPI_BUTTON_COMPONENT
63 ACPI_MODULE_NAME("acpi_button")
64
65     MODULE_AUTHOR("Paul Diefenbaugh");
66 MODULE_DESCRIPTION(ACPI_BUTTON_DRIVER_NAME);
67 MODULE_LICENSE("GPL");
68
69 static int acpi_button_add(struct acpi_device *device);
70 static int acpi_button_remove(struct acpi_device *device, int type);
71 static int acpi_button_info_open_fs(struct inode *inode, struct file *file);
72 static int acpi_button_state_open_fs(struct inode *inode, struct file *file);
73
74 static struct acpi_driver acpi_button_driver = {
75         .name = ACPI_BUTTON_DRIVER_NAME,
76         .class = ACPI_BUTTON_CLASS,
77         .ids = "ACPI_FPB,ACPI_FSB,PNP0C0D,PNP0C0C,PNP0C0E",
78         .ops = {
79                 .add = acpi_button_add,
80                 .remove = acpi_button_remove,
81                 },
82 };
83
84 struct acpi_button {
85         acpi_handle handle;
86         struct acpi_device *device;     /* Fixed button kludge */
87         u8 type;
88         unsigned long pushed;
89 };
90
91 static struct file_operations acpi_button_info_fops = {
92         .open = acpi_button_info_open_fs,
93         .read = seq_read,
94         .llseek = seq_lseek,
95         .release = single_release,
96 };
97
98 static struct file_operations acpi_button_state_fops = {
99         .open = acpi_button_state_open_fs,
100         .read = seq_read,
101         .llseek = seq_lseek,
102         .release = single_release,
103 };
104
105 /* --------------------------------------------------------------------------
106                               FS Interface (/proc)
107    -------------------------------------------------------------------------- */
108
109 static struct proc_dir_entry *acpi_button_dir;
110
111 static int acpi_button_info_seq_show(struct seq_file *seq, void *offset)
112 {
113         struct acpi_button *button = (struct acpi_button *)seq->private;
114
115         ACPI_FUNCTION_TRACE("acpi_button_info_seq_show");
116
117         if (!button || !button->device)
118                 return_VALUE(0);
119
120         seq_printf(seq, "type:                    %s\n",
121                    acpi_device_name(button->device));
122
123         return_VALUE(0);
124 }
125
126 static int acpi_button_info_open_fs(struct inode *inode, struct file *file)
127 {
128         return single_open(file, acpi_button_info_seq_show, PDE(inode)->data);
129 }
130
131 static int acpi_button_state_seq_show(struct seq_file *seq, void *offset)
132 {
133         struct acpi_button *button = (struct acpi_button *)seq->private;
134         acpi_status status;
135         unsigned long state;
136
137         ACPI_FUNCTION_TRACE("acpi_button_state_seq_show");
138
139         if (!button || !button->device)
140                 return_VALUE(0);
141
142         status = acpi_evaluate_integer(button->handle, "_LID", NULL, &state);
143         if (ACPI_FAILURE(status)) {
144                 seq_printf(seq, "state:      unsupported\n");
145         } else {
146                 seq_printf(seq, "state:      %s\n",
147                            (state ? "open" : "closed"));
148         }
149
150         return_VALUE(0);
151 }
152
153 static int acpi_button_state_open_fs(struct inode *inode, struct file *file)
154 {
155         return single_open(file, acpi_button_state_seq_show, PDE(inode)->data);
156 }
157
158 static struct proc_dir_entry *acpi_power_dir;
159 static struct proc_dir_entry *acpi_sleep_dir;
160 static struct proc_dir_entry *acpi_lid_dir;
161
162 static int acpi_button_add_fs(struct acpi_device *device)
163 {
164         struct proc_dir_entry *entry = NULL;
165         struct acpi_button *button = NULL;
166
167         ACPI_FUNCTION_TRACE("acpi_button_add_fs");
168
169         if (!device || !acpi_driver_data(device))
170                 return_VALUE(-EINVAL);
171
172         button = acpi_driver_data(device);
173
174         switch (button->type) {
175         case ACPI_BUTTON_TYPE_POWER:
176         case ACPI_BUTTON_TYPE_POWERF:
177                 if (!acpi_power_dir)
178                         acpi_power_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_POWER,
179                                                     acpi_button_dir);
180                 entry = acpi_power_dir;
181                 break;
182         case ACPI_BUTTON_TYPE_SLEEP:
183         case ACPI_BUTTON_TYPE_SLEEPF:
184                 if (!acpi_sleep_dir)
185                         acpi_sleep_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_SLEEP,
186                                                     acpi_button_dir);
187                 entry = acpi_sleep_dir;
188                 break;
189         case ACPI_BUTTON_TYPE_LID:
190                 if (!acpi_lid_dir)
191                         acpi_lid_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID,
192                                                   acpi_button_dir);
193                 entry = acpi_lid_dir;
194                 break;
195         }
196
197         if (!entry)
198                 return_VALUE(-ENODEV);
199         entry->owner = THIS_MODULE;
200
201         acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), entry);
202         if (!acpi_device_dir(device))
203                 return_VALUE(-ENODEV);
204         acpi_device_dir(device)->owner = THIS_MODULE;
205
206         /* 'info' [R] */
207         entry = create_proc_entry(ACPI_BUTTON_FILE_INFO,
208                                   S_IRUGO, acpi_device_dir(device));
209         if (!entry)
210                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
211                                   "Unable to create '%s' fs entry\n",
212                                   ACPI_BUTTON_FILE_INFO));
213         else {
214                 entry->proc_fops = &acpi_button_info_fops;
215                 entry->data = acpi_driver_data(device);
216                 entry->owner = THIS_MODULE;
217         }
218
219         /* show lid state [R] */
220         if (button->type == ACPI_BUTTON_TYPE_LID) {
221                 entry = create_proc_entry(ACPI_BUTTON_FILE_STATE,
222                                           S_IRUGO, acpi_device_dir(device));
223                 if (!entry)
224                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
225                                           "Unable to create '%s' fs entry\n",
226                                           ACPI_BUTTON_FILE_INFO));
227                 else {
228                         entry->proc_fops = &acpi_button_state_fops;
229                         entry->data = acpi_driver_data(device);
230                         entry->owner = THIS_MODULE;
231                 }
232         }
233
234         return_VALUE(0);
235 }
236
237 static int acpi_button_remove_fs(struct acpi_device *device)
238 {
239         struct acpi_button *button = NULL;
240
241         ACPI_FUNCTION_TRACE("acpi_button_remove_fs");
242
243         button = acpi_driver_data(device);
244         if (acpi_device_dir(device)) {
245                 if (button->type == ACPI_BUTTON_TYPE_LID)
246                         remove_proc_entry(ACPI_BUTTON_FILE_STATE,
247                                           acpi_device_dir(device));
248                 remove_proc_entry(ACPI_BUTTON_FILE_INFO,
249                                   acpi_device_dir(device));
250
251                 remove_proc_entry(acpi_device_bid(device),
252                                   acpi_device_dir(device)->parent);
253                 acpi_device_dir(device) = NULL;
254         }
255
256         return_VALUE(0);
257 }
258
259 /* --------------------------------------------------------------------------
260                                 Driver Interface
261    -------------------------------------------------------------------------- */
262
263 static void acpi_button_notify(acpi_handle handle, u32 event, void *data)
264 {
265         struct acpi_button *button = (struct acpi_button *)data;
266
267         ACPI_FUNCTION_TRACE("acpi_button_notify");
268
269         if (!button || !button->device)
270                 return_VOID;
271
272         switch (event) {
273         case ACPI_BUTTON_NOTIFY_STATUS:
274                 acpi_bus_generate_event(button->device, event,
275                                         ++button->pushed);
276                 break;
277         default:
278                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
279                                   "Unsupported event [0x%x]\n", event));
280                 break;
281         }
282
283         return_VOID;
284 }
285
286 static acpi_status acpi_button_notify_fixed(void *data)
287 {
288         struct acpi_button *button = (struct acpi_button *)data;
289
290         ACPI_FUNCTION_TRACE("acpi_button_notify_fixed");
291
292         if (!button)
293                 return_ACPI_STATUS(AE_BAD_PARAMETER);
294
295         acpi_button_notify(button->handle, ACPI_BUTTON_NOTIFY_STATUS, button);
296
297         return_ACPI_STATUS(AE_OK);
298 }
299
300 static int acpi_button_add(struct acpi_device *device)
301 {
302         int result = 0;
303         acpi_status status = AE_OK;
304         struct acpi_button *button = NULL;
305
306         ACPI_FUNCTION_TRACE("acpi_button_add");
307
308         if (!device)
309                 return_VALUE(-EINVAL);
310
311         button = kmalloc(sizeof(struct acpi_button), GFP_KERNEL);
312         if (!button)
313                 return_VALUE(-ENOMEM);
314         memset(button, 0, sizeof(struct acpi_button));
315
316         button->device = device;
317         button->handle = device->handle;
318         acpi_driver_data(device) = button;
319
320         /*
321          * Determine the button type (via hid), as fixed-feature buttons
322          * need to be handled a bit differently than generic-space.
323          */
324         if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_POWER)) {
325                 button->type = ACPI_BUTTON_TYPE_POWER;
326                 strcpy(acpi_device_name(device), ACPI_BUTTON_DEVICE_NAME_POWER);
327                 sprintf(acpi_device_class(device), "%s/%s",
328                         ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
329         } else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_POWERF)) {
330                 button->type = ACPI_BUTTON_TYPE_POWERF;
331                 strcpy(acpi_device_name(device),
332                        ACPI_BUTTON_DEVICE_NAME_POWERF);
333                 sprintf(acpi_device_class(device), "%s/%s",
334                         ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
335         } else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_SLEEP)) {
336                 button->type = ACPI_BUTTON_TYPE_SLEEP;
337                 strcpy(acpi_device_name(device), ACPI_BUTTON_DEVICE_NAME_SLEEP);
338                 sprintf(acpi_device_class(device), "%s/%s",
339                         ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
340         } else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_SLEEPF)) {
341                 button->type = ACPI_BUTTON_TYPE_SLEEPF;
342                 strcpy(acpi_device_name(device),
343                        ACPI_BUTTON_DEVICE_NAME_SLEEPF);
344                 sprintf(acpi_device_class(device), "%s/%s",
345                         ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
346         } else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_LID)) {
347                 button->type = ACPI_BUTTON_TYPE_LID;
348                 strcpy(acpi_device_name(device), ACPI_BUTTON_DEVICE_NAME_LID);
349                 sprintf(acpi_device_class(device), "%s/%s",
350                         ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID);
351         } else {
352                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unsupported hid [%s]\n",
353                                   acpi_device_hid(device)));
354                 result = -ENODEV;
355                 goto end;
356         }
357
358         result = acpi_button_add_fs(device);
359         if (result)
360                 goto end;
361
362         switch (button->type) {
363         case ACPI_BUTTON_TYPE_POWERF:
364                 status =
365                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
366                                                      acpi_button_notify_fixed,
367                                                      button);
368                 break;
369         case ACPI_BUTTON_TYPE_SLEEPF:
370                 status =
371                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
372                                                      acpi_button_notify_fixed,
373                                                      button);
374                 break;
375         default:
376                 status = acpi_install_notify_handler(button->handle,
377                                                      ACPI_DEVICE_NOTIFY,
378                                                      acpi_button_notify,
379                                                      button);
380                 break;
381         }
382
383         if (ACPI_FAILURE(status)) {
384                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
385                                   "Error installing notify handler\n"));
386                 result = -ENODEV;
387                 goto end;
388         }
389
390         if (device->wakeup.flags.valid) {
391                 /* Button's GPE is run-wake GPE */
392                 acpi_set_gpe_type(device->wakeup.gpe_device,
393                                   device->wakeup.gpe_number,
394                                   ACPI_GPE_TYPE_WAKE_RUN);
395                 acpi_enable_gpe(device->wakeup.gpe_device,
396                                 device->wakeup.gpe_number, ACPI_NOT_ISR);
397                 device->wakeup.state.enabled = 1;
398         }
399
400         printk(KERN_INFO PREFIX "%s [%s]\n",
401                acpi_device_name(device), acpi_device_bid(device));
402
403       end:
404         if (result) {
405                 acpi_button_remove_fs(device);
406                 kfree(button);
407         }
408
409         return_VALUE(result);
410 }
411
412 static int acpi_button_remove(struct acpi_device *device, int type)
413 {
414         acpi_status status = 0;
415         struct acpi_button *button = NULL;
416
417         ACPI_FUNCTION_TRACE("acpi_button_remove");
418
419         if (!device || !acpi_driver_data(device))
420                 return_VALUE(-EINVAL);
421
422         button = acpi_driver_data(device);
423
424         /* Unregister for device notifications. */
425         switch (button->type) {
426         case ACPI_BUTTON_TYPE_POWERF:
427                 status =
428                     acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
429                                                     acpi_button_notify_fixed);
430                 break;
431         case ACPI_BUTTON_TYPE_SLEEPF:
432                 status =
433                     acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
434                                                     acpi_button_notify_fixed);
435                 break;
436         default:
437                 status = acpi_remove_notify_handler(button->handle,
438                                                     ACPI_DEVICE_NOTIFY,
439                                                     acpi_button_notify);
440                 break;
441         }
442
443         if (ACPI_FAILURE(status))
444                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
445                                   "Error removing notify handler\n"));
446
447         acpi_button_remove_fs(device);
448
449         kfree(button);
450
451         return_VALUE(0);
452 }
453
454 static int __init acpi_button_init(void)
455 {
456         int result = 0;
457
458         ACPI_FUNCTION_TRACE("acpi_button_init");
459
460         acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir);
461         if (!acpi_button_dir)
462                 return_VALUE(-ENODEV);
463         acpi_button_dir->owner = THIS_MODULE;
464         result = acpi_bus_register_driver(&acpi_button_driver);
465         if (result < 0) {
466                 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
467                 return_VALUE(-ENODEV);
468         }
469
470         return_VALUE(0);
471 }
472
473 static void __exit acpi_button_exit(void)
474 {
475         ACPI_FUNCTION_TRACE("acpi_button_exit");
476
477         acpi_bus_unregister_driver(&acpi_button_driver);
478
479         if (acpi_power_dir)
480                 remove_proc_entry(ACPI_BUTTON_SUBCLASS_POWER, acpi_button_dir);
481         if (acpi_sleep_dir)
482                 remove_proc_entry(ACPI_BUTTON_SUBCLASS_SLEEP, acpi_button_dir);
483         if (acpi_lid_dir)
484                 remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
485         remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
486
487         return_VOID;
488 }
489
490 module_init(acpi_button_init);
491 module_exit(acpi_button_exit);