Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes...
[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 <linux/input.h>
33 #include <acpi/acpi_bus.h>
34 #include <acpi/acpi_drivers.h>
35
36 #define ACPI_BUTTON_CLASS               "button"
37 #define ACPI_BUTTON_FILE_INFO           "info"
38 #define ACPI_BUTTON_FILE_STATE          "state"
39 #define ACPI_BUTTON_TYPE_UNKNOWN        0x00
40 #define ACPI_BUTTON_NOTIFY_STATUS       0x80
41
42 #define ACPI_BUTTON_SUBCLASS_POWER      "power"
43 #define ACPI_BUTTON_HID_POWER           "PNP0C0C"
44 #define ACPI_BUTTON_DEVICE_NAME_POWER   "Power Button (CM)"
45 #define ACPI_BUTTON_DEVICE_NAME_POWERF  "Power Button (FF)"
46 #define ACPI_BUTTON_TYPE_POWER          0x01
47 #define ACPI_BUTTON_TYPE_POWERF         0x02
48
49 #define ACPI_BUTTON_SUBCLASS_SLEEP      "sleep"
50 #define ACPI_BUTTON_HID_SLEEP           "PNP0C0E"
51 #define ACPI_BUTTON_DEVICE_NAME_SLEEP   "Sleep Button (CM)"
52 #define ACPI_BUTTON_DEVICE_NAME_SLEEPF  "Sleep Button (FF)"
53 #define ACPI_BUTTON_TYPE_SLEEP          0x03
54 #define ACPI_BUTTON_TYPE_SLEEPF         0x04
55
56 #define ACPI_BUTTON_SUBCLASS_LID        "lid"
57 #define ACPI_BUTTON_HID_LID             "PNP0C0D"
58 #define ACPI_BUTTON_DEVICE_NAME_LID     "Lid Switch"
59 #define ACPI_BUTTON_TYPE_LID            0x05
60
61 #define _COMPONENT              ACPI_BUTTON_COMPONENT
62 ACPI_MODULE_NAME("button");
63
64 MODULE_AUTHOR("Paul Diefenbaugh");
65 MODULE_DESCRIPTION("ACPI Button Driver");
66 MODULE_LICENSE("GPL");
67
68 static const struct acpi_device_id button_device_ids[] = {
69         {ACPI_BUTTON_HID_LID,    0},
70         {ACPI_BUTTON_HID_SLEEP,  0},
71         {ACPI_BUTTON_HID_SLEEPF, 0},
72         {ACPI_BUTTON_HID_POWER,  0},
73         {ACPI_BUTTON_HID_POWERF, 0},
74         {"", 0},
75 };
76 MODULE_DEVICE_TABLE(acpi, button_device_ids);
77
78 static int acpi_button_add(struct acpi_device *device);
79 static int acpi_button_remove(struct acpi_device *device, int type);
80 static int acpi_button_resume(struct acpi_device *device);
81 static int acpi_button_info_open_fs(struct inode *inode, struct file *file);
82 static int acpi_button_state_open_fs(struct inode *inode, struct file *file);
83
84 static struct acpi_driver acpi_button_driver = {
85         .name = "button",
86         .class = ACPI_BUTTON_CLASS,
87         .ids = button_device_ids,
88         .ops = {
89                 .add = acpi_button_add,
90                 .resume = acpi_button_resume,
91                 .remove = acpi_button_remove,
92         },
93 };
94
95 struct acpi_button {
96         struct acpi_device *device;     /* Fixed button kludge */
97         unsigned int type;
98         struct input_dev *input;
99         char phys[32];                  /* for input device */
100         unsigned long pushed;
101 };
102
103 static const struct file_operations acpi_button_info_fops = {
104         .owner = THIS_MODULE,
105         .open = acpi_button_info_open_fs,
106         .read = seq_read,
107         .llseek = seq_lseek,
108         .release = single_release,
109 };
110
111 static const struct file_operations acpi_button_state_fops = {
112         .owner = THIS_MODULE,
113         .open = acpi_button_state_open_fs,
114         .read = seq_read,
115         .llseek = seq_lseek,
116         .release = single_release,
117 };
118
119 /* --------------------------------------------------------------------------
120                               FS Interface (/proc)
121    -------------------------------------------------------------------------- */
122
123 static struct proc_dir_entry *acpi_button_dir;
124
125 static int acpi_button_info_seq_show(struct seq_file *seq, void *offset)
126 {
127         struct acpi_button *button = seq->private;
128
129         if (!button || !button->device)
130                 return 0;
131
132         seq_printf(seq, "type:                    %s\n",
133                    acpi_device_name(button->device));
134
135         return 0;
136 }
137
138 static int acpi_button_info_open_fs(struct inode *inode, struct file *file)
139 {
140         return single_open(file, acpi_button_info_seq_show, PDE(inode)->data);
141 }
142
143 static int acpi_button_state_seq_show(struct seq_file *seq, void *offset)
144 {
145         struct acpi_button *button = seq->private;
146         acpi_status status;
147         unsigned long long state;
148
149         if (!button || !button->device)
150                 return 0;
151
152         status = acpi_evaluate_integer(button->device->handle, "_LID", NULL, &state);
153         seq_printf(seq, "state:      %s\n",
154                    ACPI_FAILURE(status) ? "unsupported" :
155                         (state ? "open" : "closed"));
156         return 0;
157 }
158
159 static int acpi_button_state_open_fs(struct inode *inode, struct file *file)
160 {
161         return single_open(file, acpi_button_state_seq_show, PDE(inode)->data);
162 }
163
164 static struct proc_dir_entry *acpi_power_dir;
165 static struct proc_dir_entry *acpi_sleep_dir;
166 static struct proc_dir_entry *acpi_lid_dir;
167
168 static int acpi_button_add_fs(struct acpi_device *device)
169 {
170         struct proc_dir_entry *entry = NULL;
171         struct acpi_button *button;
172
173         if (!device || !acpi_driver_data(device))
174                 return -EINVAL;
175
176         button = acpi_driver_data(device);
177
178         switch (button->type) {
179         case ACPI_BUTTON_TYPE_POWER:
180         case ACPI_BUTTON_TYPE_POWERF:
181                 if (!acpi_power_dir)
182                         acpi_power_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_POWER,
183                                                     acpi_button_dir);
184                 entry = acpi_power_dir;
185                 break;
186         case ACPI_BUTTON_TYPE_SLEEP:
187         case ACPI_BUTTON_TYPE_SLEEPF:
188                 if (!acpi_sleep_dir)
189                         acpi_sleep_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_SLEEP,
190                                                     acpi_button_dir);
191                 entry = acpi_sleep_dir;
192                 break;
193         case ACPI_BUTTON_TYPE_LID:
194                 if (!acpi_lid_dir)
195                         acpi_lid_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID,
196                                                   acpi_button_dir);
197                 entry = acpi_lid_dir;
198                 break;
199         }
200
201         if (!entry)
202                 return -ENODEV;
203
204         acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), entry);
205         if (!acpi_device_dir(device))
206                 return -ENODEV;
207
208         /* 'info' [R] */
209         entry = proc_create_data(ACPI_BUTTON_FILE_INFO,
210                                  S_IRUGO, acpi_device_dir(device),
211                                  &acpi_button_info_fops,
212                                  acpi_driver_data(device));
213         if (!entry)
214                 return -ENODEV;
215
216         /* show lid state [R] */
217         if (button->type == ACPI_BUTTON_TYPE_LID) {
218                 entry = proc_create_data(ACPI_BUTTON_FILE_STATE,
219                                          S_IRUGO, acpi_device_dir(device),
220                                          &acpi_button_state_fops,
221                                          acpi_driver_data(device));
222                 if (!entry)
223                         return -ENODEV;
224         }
225
226         return 0;
227 }
228
229 static int acpi_button_remove_fs(struct acpi_device *device)
230 {
231         struct acpi_button *button = acpi_driver_data(device);
232
233         if (acpi_device_dir(device)) {
234                 if (button->type == ACPI_BUTTON_TYPE_LID)
235                         remove_proc_entry(ACPI_BUTTON_FILE_STATE,
236                                           acpi_device_dir(device));
237                 remove_proc_entry(ACPI_BUTTON_FILE_INFO,
238                                   acpi_device_dir(device));
239
240                 remove_proc_entry(acpi_device_bid(device),
241                                   acpi_device_dir(device)->parent);
242                 acpi_device_dir(device) = NULL;
243         }
244
245         return 0;
246 }
247
248 /* --------------------------------------------------------------------------
249                                 Driver Interface
250    -------------------------------------------------------------------------- */
251 static int acpi_lid_send_state(struct acpi_button *button)
252 {
253         unsigned long long state;
254         acpi_status status;
255
256         status = acpi_evaluate_integer(button->device->handle, "_LID", NULL,
257                                         &state);
258         if (ACPI_FAILURE(status))
259                 return -ENODEV;
260         /* input layer checks if event is redundant */
261         input_report_switch(button->input, SW_LID, !state);
262         input_sync(button->input);
263         return 0;
264 }
265
266 static void acpi_button_notify(acpi_handle handle, u32 event, void *data)
267 {
268         struct acpi_button *button = data;
269         struct input_dev *input;
270
271         if (!button || !button->device)
272                 return;
273
274         switch (event) {
275         case ACPI_BUTTON_NOTIFY_STATUS:
276                 input = button->input;
277                 if (button->type == ACPI_BUTTON_TYPE_LID) {
278                         acpi_lid_send_state(button);
279                 } else {
280                         int keycode = test_bit(KEY_SLEEP, input->keybit) ?
281                                                 KEY_SLEEP : KEY_POWER;
282
283                         input_report_key(input, keycode, 1);
284                         input_sync(input);
285                         input_report_key(input, keycode, 0);
286                         input_sync(input);
287                 }
288
289                 acpi_bus_generate_proc_event(button->device, event,
290                                         ++button->pushed);
291                 break;
292         default:
293                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
294                                   "Unsupported event [0x%x]\n", event));
295                 break;
296         }
297
298         return;
299 }
300
301 static acpi_status acpi_button_notify_fixed(void *data)
302 {
303         struct acpi_button *button = data;
304
305         if (!button)
306                 return AE_BAD_PARAMETER;
307
308         acpi_button_notify(button->device->handle, ACPI_BUTTON_NOTIFY_STATUS, button);
309
310         return AE_OK;
311 }
312
313 static int acpi_button_install_notify_handlers(struct acpi_button *button)
314 {
315         acpi_status status;
316
317         switch (button->type) {
318         case ACPI_BUTTON_TYPE_POWERF:
319                 status =
320                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
321                                                      acpi_button_notify_fixed,
322                                                      button);
323                 break;
324         case ACPI_BUTTON_TYPE_SLEEPF:
325                 status =
326                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
327                                                      acpi_button_notify_fixed,
328                                                      button);
329                 break;
330         default:
331                 status = acpi_install_notify_handler(button->device->handle,
332                                                      ACPI_DEVICE_NOTIFY,
333                                                      acpi_button_notify,
334                                                      button);
335                 break;
336         }
337
338         return ACPI_FAILURE(status) ? -ENODEV : 0;
339 }
340
341 static int acpi_button_resume(struct acpi_device *device)
342 {
343         struct acpi_button *button;
344         if (!device)
345                 return -EINVAL;
346         button = acpi_driver_data(device);
347         if (button && button->type == ACPI_BUTTON_TYPE_LID)
348                 return acpi_lid_send_state(button);
349         return 0;
350 }
351
352 static void acpi_button_remove_notify_handlers(struct acpi_button *button)
353 {
354         switch (button->type) {
355         case ACPI_BUTTON_TYPE_POWERF:
356                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
357                                                 acpi_button_notify_fixed);
358                 break;
359         case ACPI_BUTTON_TYPE_SLEEPF:
360                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
361                                                 acpi_button_notify_fixed);
362                 break;
363         default:
364                 acpi_remove_notify_handler(button->device->handle,
365                                            ACPI_DEVICE_NOTIFY,
366                                            acpi_button_notify);
367                 break;
368         }
369 }
370
371 static int acpi_button_add(struct acpi_device *device)
372 {
373         int error;
374         struct acpi_button *button;
375         struct input_dev *input;
376
377         if (!device)
378                 return -EINVAL;
379
380         button = kzalloc(sizeof(struct acpi_button), GFP_KERNEL);
381         if (!button)
382                 return -ENOMEM;
383
384         button->device = device;
385         device->driver_data = button;
386
387         button->input = input = input_allocate_device();
388         if (!input) {
389                 error = -ENOMEM;
390                 goto err_free_button;
391         }
392
393         /*
394          * Determine the button type (via hid), as fixed-feature buttons
395          * need to be handled a bit differently than generic-space.
396          */
397         if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_POWER)) {
398                 button->type = ACPI_BUTTON_TYPE_POWER;
399                 strcpy(acpi_device_name(device), ACPI_BUTTON_DEVICE_NAME_POWER);
400                 sprintf(acpi_device_class(device), "%s/%s",
401                         ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
402         } else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_POWERF)) {
403                 button->type = ACPI_BUTTON_TYPE_POWERF;
404                 strcpy(acpi_device_name(device),
405                        ACPI_BUTTON_DEVICE_NAME_POWERF);
406                 sprintf(acpi_device_class(device), "%s/%s",
407                         ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
408         } else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_SLEEP)) {
409                 button->type = ACPI_BUTTON_TYPE_SLEEP;
410                 strcpy(acpi_device_name(device), ACPI_BUTTON_DEVICE_NAME_SLEEP);
411                 sprintf(acpi_device_class(device), "%s/%s",
412                         ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
413         } else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_SLEEPF)) {
414                 button->type = ACPI_BUTTON_TYPE_SLEEPF;
415                 strcpy(acpi_device_name(device),
416                        ACPI_BUTTON_DEVICE_NAME_SLEEPF);
417                 sprintf(acpi_device_class(device), "%s/%s",
418                         ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
419         } else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_LID)) {
420                 button->type = ACPI_BUTTON_TYPE_LID;
421                 strcpy(acpi_device_name(device), ACPI_BUTTON_DEVICE_NAME_LID);
422                 sprintf(acpi_device_class(device), "%s/%s",
423                         ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID);
424         } else {
425                 printk(KERN_ERR PREFIX "Unsupported hid [%s]\n",
426                             acpi_device_hid(device));
427                 error = -ENODEV;
428                 goto err_free_input;
429         }
430
431         error = acpi_button_add_fs(device);
432         if (error)
433                 goto err_free_input;
434
435         error = acpi_button_install_notify_handlers(button);
436         if (error)
437                 goto err_remove_fs;
438
439         snprintf(button->phys, sizeof(button->phys),
440                  "%s/button/input0", acpi_device_hid(device));
441
442         input->name = acpi_device_name(device);
443         input->phys = button->phys;
444         input->id.bustype = BUS_HOST;
445         input->id.product = button->type;
446         input->dev.parent = &device->dev;
447
448         switch (button->type) {
449         case ACPI_BUTTON_TYPE_POWER:
450         case ACPI_BUTTON_TYPE_POWERF:
451                 input->evbit[0] = BIT_MASK(EV_KEY);
452                 set_bit(KEY_POWER, input->keybit);
453                 break;
454
455         case ACPI_BUTTON_TYPE_SLEEP:
456         case ACPI_BUTTON_TYPE_SLEEPF:
457                 input->evbit[0] = BIT_MASK(EV_KEY);
458                 set_bit(KEY_SLEEP, input->keybit);
459                 break;
460
461         case ACPI_BUTTON_TYPE_LID:
462                 input->evbit[0] = BIT_MASK(EV_SW);
463                 set_bit(SW_LID, input->swbit);
464                 break;
465         }
466
467         error = input_register_device(input);
468         if (error)
469                 goto err_remove_handlers;
470         if (button->type == ACPI_BUTTON_TYPE_LID)
471                 acpi_lid_send_state(button);
472
473         if (device->wakeup.flags.valid) {
474                 /* Button's GPE is run-wake GPE */
475                 acpi_set_gpe_type(device->wakeup.gpe_device,
476                                   device->wakeup.gpe_number,
477                                   ACPI_GPE_TYPE_WAKE_RUN);
478                 acpi_enable_gpe(device->wakeup.gpe_device,
479                                 device->wakeup.gpe_number);
480                 device->wakeup.state.enabled = 1;
481         }
482
483         printk(KERN_INFO PREFIX "%s [%s]\n",
484                acpi_device_name(device), acpi_device_bid(device));
485
486         return 0;
487
488  err_remove_handlers:
489         acpi_button_remove_notify_handlers(button);
490  err_remove_fs:
491         acpi_button_remove_fs(device);
492  err_free_input:
493         input_free_device(input);
494  err_free_button:
495         kfree(button);
496         return error;
497 }
498
499 static int acpi_button_remove(struct acpi_device *device, int type)
500 {
501         struct acpi_button *button;
502
503         if (!device || !acpi_driver_data(device))
504                 return -EINVAL;
505
506         button = acpi_driver_data(device);
507
508         acpi_button_remove_notify_handlers(button);
509         acpi_button_remove_fs(device);
510         input_unregister_device(button->input);
511         kfree(button);
512
513         return 0;
514 }
515
516 static int __init acpi_button_init(void)
517 {
518         int result;
519
520         acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir);
521         if (!acpi_button_dir)
522                 return -ENODEV;
523         result = acpi_bus_register_driver(&acpi_button_driver);
524         if (result < 0) {
525                 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
526                 return -ENODEV;
527         }
528
529         return 0;
530 }
531
532 static void __exit acpi_button_exit(void)
533 {
534         acpi_bus_unregister_driver(&acpi_button_driver);
535
536         if (acpi_power_dir)
537                 remove_proc_entry(ACPI_BUTTON_SUBCLASS_POWER, acpi_button_dir);
538         if (acpi_sleep_dir)
539                 remove_proc_entry(ACPI_BUTTON_SUBCLASS_SLEEP, acpi_button_dir);
540         if (acpi_lid_dir)
541                 remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
542         remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
543 }
544
545 module_init(acpi_button_init);
546 module_exit(acpi_button_exit);