Merge with /shiny/git/linux-2.6/.git
[linux-2.6] / drivers / acpi / hotkey.c
1 /*
2  *  hotkey.c - ACPI Hotkey Driver ($Revision: 0.2 $)
3  *
4  *  Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
5  *
6  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
7  *
8  *  This program is free software; you can redistribute it and/or modify
9  *  it under the terms of the GNU General Public License as published by
10  *  the Free Software Foundation; either version 2 of the License, or (at
11  *  your option) any later version.
12  *
13  *  This program is distributed in the hope that it will be useful, but
14  *  WITHOUT ANY WARRANTY; without even the implied warranty of
15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  *  General Public License for more details.
17  *
18  *  You should have received a copy of the GNU General Public License along
19  *  with this program; if not, write to the Free Software Foundation, Inc.,
20  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
21  *
22  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
23  */
24 #include <linux/kernel.h>
25 #include <linux/module.h>
26 #include <linux/init.h>
27 #include <linux/types.h>
28 #include <linux/proc_fs.h>
29 #include <linux/sched.h>
30 #include <linux/kmod.h>
31 #include <linux/seq_file.h>
32 #include <acpi/acpi_drivers.h>
33 #include <acpi/acpi_bus.h>
34 #include <asm/uaccess.h>
35
36 #define HOTKEY_ACPI_VERSION "0.1"
37
38 #define HOTKEY_PROC "hotkey"
39 #define HOTKEY_EV_CONFIG    "event_config"
40 #define HOTKEY_PL_CONFIG    "poll_config"
41 #define HOTKEY_ACTION   "action"
42 #define HOTKEY_INFO "info"
43
44 #define ACPI_HOTK_NAME          "Generic Hotkey Driver"
45 #define ACPI_HOTK_CLASS         "Hotkey"
46 #define ACPI_HOTK_DEVICE_NAME   "Hotkey"
47 #define ACPI_HOTK_HID           "Unknown?"
48 #define ACPI_HOTKEY_COMPONENT   0x20000000
49
50 #define ACPI_HOTKEY_EVENT   0x1
51 #define ACPI_HOTKEY_POLLING 0x2
52 #define ACPI_UNDEFINED_EVENT    0xf
53
54 #define RESULT_STR_LEN      80
55
56 #define ACTION_METHOD   0
57 #define POLL_METHOD     1
58
59 #define IS_EVENT(e)             ((e) <= 10000 && (e) >0)
60 #define IS_POLL(e)              ((e) > 10000)
61 #define IS_OTHERS(e)            ((e)<=0 || (e)>=20000)
62 #define _COMPONENT              ACPI_HOTKEY_COMPONENT
63 ACPI_MODULE_NAME("acpi_hotkey")
64
65 MODULE_AUTHOR("luming.yu@intel.com");
66 MODULE_DESCRIPTION(ACPI_HOTK_NAME);
67 MODULE_LICENSE("GPL");
68
69 /*  standardized internal hotkey number/event  */
70 enum {
71         /* Video Extension event */
72         HK_EVENT_CYCLE_OUTPUT_DEVICE = 0x80,
73         HK_EVENT_OUTPUT_DEVICE_STATUS_CHANGE,
74         HK_EVENT_CYCLE_DISPLAY_OUTPUT,
75         HK_EVENT_NEXT_DISPLAY_OUTPUT,
76         HK_EVENT_PREVIOUS_DISPLAY_OUTPUT,
77         HK_EVENT_CYCLE_BRIGHTNESS,
78         HK_EVENT_INCREASE_BRIGHTNESS,
79         HK_EVENT_DECREASE_BRIGHTNESS,
80         HK_EVENT_ZERO_BRIGHTNESS,
81         HK_EVENT_DISPLAY_DEVICE_OFF,
82
83         /* Snd Card event */
84         HK_EVENT_VOLUME_MUTE,
85         HK_EVENT_VOLUME_INCLREASE,
86         HK_EVENT_VOLUME_DECREASE,
87
88         /* running state control */
89         HK_EVENT_ENTERRING_S3,
90         HK_EVENT_ENTERRING_S4,
91         HK_EVENT_ENTERRING_S5,
92 };
93
94 /*  procdir we use */
95 static struct proc_dir_entry *hotkey_proc_dir;
96 static struct proc_dir_entry *hotkey_config;
97 static struct proc_dir_entry *hotkey_poll_config;
98 static struct proc_dir_entry *hotkey_action;
99 static struct proc_dir_entry *hotkey_info;
100
101 /* linkage for all type of hotkey */
102 struct acpi_hotkey_link {
103         struct list_head entries;
104         int hotkey_type;        /* event or polling based hotkey  */
105         int hotkey_standard_num;        /* standardized hotkey(event) number */
106 };
107
108 /* event based hotkey */
109 struct acpi_event_hotkey {
110         struct acpi_hotkey_link hotkey_link;
111         int flag;
112         acpi_handle bus_handle; /* bus to install notify handler */
113         int external_hotkey_num;        /* external hotkey/event number */
114         acpi_handle action_handle;      /* acpi handle attached aml action method */
115         char *action_method;    /* action method */
116 };
117
118 /*
119  * There are two ways to poll status
120  * 1. directy call read_xxx method, without any arguments passed in
121  * 2. call write_xxx method, with arguments passed in, you need
122  * the result is saved in acpi_polling_hotkey.poll_result.
123  * anthoer read command through polling interface.
124  *
125  */
126
127 /* polling based hotkey */
128 struct acpi_polling_hotkey {
129         struct acpi_hotkey_link hotkey_link;
130         int flag;
131         acpi_handle poll_handle;        /* acpi handle attached polling method */
132         char *poll_method;      /* poll method */
133         acpi_handle action_handle;      /* acpi handle attached action method */
134         char *action_method;    /* action method */
135         union acpi_object *poll_result; /* polling_result */
136         struct proc_dir_entry *proc;
137 };
138
139 /* hotkey object union */
140 union acpi_hotkey {
141         struct list_head entries;
142         struct acpi_hotkey_link link;
143         struct acpi_event_hotkey event_hotkey;
144         struct acpi_polling_hotkey poll_hotkey;
145 };
146
147 /* hotkey object list */
148 struct acpi_hotkey_list {
149         struct list_head *entries;
150         int count;
151 };
152
153 static int auto_hotkey_add(struct acpi_device *device);
154 static int auto_hotkey_remove(struct acpi_device *device, int type);
155
156 static struct acpi_driver hotkey_driver = {
157         .name = ACPI_HOTK_NAME,
158         .class = ACPI_HOTK_CLASS,
159         .ids = ACPI_HOTK_HID,
160         .ops = {
161                 .add = auto_hotkey_add,
162                 .remove = auto_hotkey_remove,
163                 },
164 };
165
166 static void free_hotkey_device(union acpi_hotkey *key);
167 static void free_hotkey_buffer(union acpi_hotkey *key);
168 static void free_poll_hotkey_buffer(union acpi_hotkey *key);
169 static int hotkey_open_config(struct inode *inode, struct file *file);
170 static int hotkey_poll_open_config(struct inode *inode, struct file *file);
171 static ssize_t hotkey_write_config(struct file *file,
172                                    const char __user * buffer,
173                                    size_t count, loff_t * data);
174 static int hotkey_info_open_fs(struct inode *inode, struct file *file);
175 static int hotkey_action_open_fs(struct inode *inode, struct file *file);
176 static ssize_t hotkey_execute_aml_method(struct file *file,
177                                          const char __user * buffer,
178                                          size_t count, loff_t * data);
179 static int hotkey_config_seq_show(struct seq_file *seq, void *offset);
180 static int hotkey_poll_config_seq_show(struct seq_file *seq, void *offset);
181 static int hotkey_polling_open_fs(struct inode *inode, struct file *file);
182 static union acpi_hotkey *get_hotkey_by_event(struct
183                               acpi_hotkey_list
184                               *hotkey_list, int event);
185
186 /* event based config */
187 static struct file_operations hotkey_config_fops = {
188         .open = hotkey_open_config,
189         .read = seq_read,
190         .write = hotkey_write_config,
191         .llseek = seq_lseek,
192         .release = single_release,
193 };
194
195 /* polling based config */
196 static struct file_operations hotkey_poll_config_fops = {
197         .open = hotkey_poll_open_config,
198         .read = seq_read,
199         .write = hotkey_write_config,
200         .llseek = seq_lseek,
201         .release = single_release,
202 };
203
204 /* hotkey driver info */
205 static struct file_operations hotkey_info_fops = {
206         .open = hotkey_info_open_fs,
207         .read = seq_read,
208         .llseek = seq_lseek,
209         .release = single_release,
210 };
211
212 /* action */
213 static struct file_operations hotkey_action_fops = {
214         .open = hotkey_action_open_fs,
215         .read = seq_read,
216         .write = hotkey_execute_aml_method,
217         .llseek = seq_lseek,
218         .release = single_release,
219 };
220
221 /* polling results */
222 static struct file_operations hotkey_polling_fops = {
223         .open = hotkey_polling_open_fs,
224         .read = seq_read,
225         .llseek = seq_lseek,
226         .release = single_release,
227 };
228
229 struct acpi_hotkey_list global_hotkey_list;     /* link all ev or pl hotkey  */
230 struct list_head hotkey_entries;        /* head of the list of hotkey_list */
231
232 static int hotkey_info_seq_show(struct seq_file *seq, void *offset)
233 {
234         ACPI_FUNCTION_TRACE("hotkey_info_seq_show");
235
236         seq_printf(seq, "Hotkey generic driver ver: %s\n", HOTKEY_ACPI_VERSION);
237
238         return_VALUE(0);
239 }
240
241 static int hotkey_info_open_fs(struct inode *inode, struct file *file)
242 {
243         return single_open(file, hotkey_info_seq_show, PDE(inode)->data);
244 }
245
246 static char *format_result(union acpi_object *object)
247 {
248         char *buf = NULL;
249         
250         buf = (char *)kmalloc(RESULT_STR_LEN, GFP_KERNEL);
251         if (buf)
252                 memset(buf, 0, RESULT_STR_LEN);
253         else
254                 goto do_fail;
255
256         /* Now, just support integer type */
257         if (object->type == ACPI_TYPE_INTEGER)
258                 sprintf(buf, "%d\n", (u32) object->integer.value);
259 do_fail:
260         return (buf);
261 }
262
263 static int hotkey_polling_seq_show(struct seq_file *seq, void *offset)
264 {
265         struct acpi_polling_hotkey *poll_hotkey =
266             (struct acpi_polling_hotkey *)seq->private;
267         char *buf;
268
269         ACPI_FUNCTION_TRACE("hotkey_polling_seq_show");
270
271         if (poll_hotkey->poll_result){
272                 buf = format_result(poll_hotkey->poll_result);
273                 if(buf)
274                         seq_printf(seq, "%s", buf);
275                 kfree(buf);
276         }
277         return_VALUE(0);
278 }
279
280 static int hotkey_polling_open_fs(struct inode *inode, struct file *file)
281 {
282         return single_open(file, hotkey_polling_seq_show, PDE(inode)->data);
283 }
284
285 static int hotkey_action_open_fs(struct inode *inode, struct file *file)
286 {
287         return single_open(file, hotkey_info_seq_show, PDE(inode)->data);
288 }
289
290 /* Mapping external hotkey number to standardized hotkey event num */
291 static int hotkey_get_internal_event(int event, struct acpi_hotkey_list *list)
292 {
293         struct list_head *entries;
294         int val = -1;
295
296         ACPI_FUNCTION_TRACE("hotkey_get_internal_event");
297
298         list_for_each(entries, list->entries) {
299                 union acpi_hotkey *key =
300                     container_of(entries, union acpi_hotkey, entries);
301                 if (key->link.hotkey_type == ACPI_HOTKEY_EVENT
302                     && key->event_hotkey.external_hotkey_num == event){
303                         val = key->link.hotkey_standard_num;
304                         break;
305                 }
306         }
307
308         return_VALUE(val);
309 }
310
311 static void
312 acpi_hotkey_notify_handler(acpi_handle handle, u32 event, void *data)
313 {
314         struct acpi_device *device = NULL;
315         u32 internal_event;
316
317         ACPI_FUNCTION_TRACE("acpi_hotkey_notify_handler");
318
319         if (acpi_bus_get_device(handle, &device))
320                 return_VOID;
321
322         internal_event = hotkey_get_internal_event(event, &global_hotkey_list);
323         acpi_bus_generate_event(device, internal_event, 0);
324
325         return_VOID;
326 }
327
328 /* Need to invent automatically hotkey add method */
329 static int auto_hotkey_add(struct acpi_device *device)
330 {
331         /* Implement me */
332         return 0;
333 }
334
335 /* Need to invent automatically hotkey remove method */
336 static int auto_hotkey_remove(struct acpi_device *device, int type)
337 {
338         /* Implement me */
339         return 0;
340 }
341
342 /* Create a proc file for each polling method */
343 static int create_polling_proc(union acpi_hotkey *device)
344 {
345         struct proc_dir_entry *proc;
346         char  proc_name[80];
347         mode_t mode;
348
349         ACPI_FUNCTION_TRACE("create_polling_proc");
350         mode = S_IFREG | S_IRUGO | S_IWUGO;
351
352         sprintf(proc_name, "%d", device->link.hotkey_standard_num);
353         /*
354         strcat(proc_name, device->poll_hotkey.poll_method);
355         */
356         proc = create_proc_entry(proc_name, mode, hotkey_proc_dir);
357
358         if (!proc) {
359                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
360                                   "Hotkey: Unable to create %s entry\n",
361                                   device->poll_hotkey.poll_method));
362                 return_VALUE(-ENODEV);
363         } else {
364                 proc->proc_fops = &hotkey_polling_fops;
365                 proc->owner = THIS_MODULE;
366                 proc->data = device;
367                 proc->uid = 0;
368                 proc->gid = 0;
369                 device->poll_hotkey.proc = proc;
370         }
371         return_VALUE(0);
372 }
373
374 static int hotkey_add(union acpi_hotkey *device)
375 {
376         int status = 0;
377         struct acpi_device *dev = NULL;
378
379         ACPI_FUNCTION_TRACE("hotkey_add");
380
381         if (device->link.hotkey_type == ACPI_HOTKEY_EVENT) {
382                 acpi_bus_get_device(device->event_hotkey.bus_handle, &dev);
383                 status = acpi_install_notify_handler(dev->handle,
384                                                      ACPI_DEVICE_NOTIFY,
385                                                      acpi_hotkey_notify_handler,
386                                                      dev);
387         } else                  /* Add polling hotkey */
388                 create_polling_proc(device);
389
390         global_hotkey_list.count++;
391
392         list_add_tail(&device->link.entries, global_hotkey_list.entries);
393
394         return_VALUE(status);
395 }
396
397 static int hotkey_remove(union acpi_hotkey *device)
398 {
399         struct list_head *entries, *next;
400
401         ACPI_FUNCTION_TRACE("hotkey_remove");
402
403         list_for_each_safe(entries, next, global_hotkey_list.entries) {
404                 union acpi_hotkey *key =
405                     container_of(entries, union acpi_hotkey, entries);
406                 if (key->link.hotkey_standard_num ==
407                     device->link.hotkey_standard_num) {
408                         list_del(&key->link.entries);
409                         free_hotkey_device(key);
410                         global_hotkey_list.count--;
411                         break;
412                 }
413         }
414         kfree(device);
415         return_VALUE(0);
416 }
417
418 static int  hotkey_update(union acpi_hotkey *key)
419 {
420         struct list_head *entries;
421
422         ACPI_FUNCTION_TRACE("hotkey_update");
423
424         list_for_each(entries, global_hotkey_list.entries) {
425                 union acpi_hotkey *tmp=
426                     container_of(entries, union acpi_hotkey, entries);
427                 if (tmp->link.hotkey_standard_num ==
428                     key->link.hotkey_standard_num) {
429                         if (key->link.hotkey_type == ACPI_HOTKEY_EVENT) {
430                                 free_hotkey_buffer(tmp);
431                                 tmp->event_hotkey.bus_handle =
432                                         key->event_hotkey.bus_handle;
433                                 tmp->event_hotkey.external_hotkey_num =
434                                         key->event_hotkey.external_hotkey_num;
435                                 tmp->event_hotkey.action_handle =
436                                         key->event_hotkey.action_handle;
437                                 tmp->event_hotkey.action_method =
438                                         key->event_hotkey.action_method;
439                                 kfree(key);
440                         } else {
441                                 /*
442                                 char  proc_name[80];
443
444                                 sprintf(proc_name, "%d", tmp->link.hotkey_standard_num);
445                                 strcat(proc_name, tmp->poll_hotkey.poll_method);
446                                 remove_proc_entry(proc_name,hotkey_proc_dir);
447                                 */
448                                 free_poll_hotkey_buffer(tmp);
449                                 tmp->poll_hotkey.poll_handle =
450                                         key->poll_hotkey.poll_handle;
451                                 tmp->poll_hotkey.poll_method =
452                                         key->poll_hotkey.poll_method;
453                                 tmp->poll_hotkey.action_handle =
454                                         key->poll_hotkey.action_handle;
455                                 tmp->poll_hotkey.action_method =
456                                         key->poll_hotkey.action_method;
457                                 tmp->poll_hotkey.poll_result =
458                                         key->poll_hotkey.poll_result;
459                                 /*
460                                 create_polling_proc(tmp);
461                                 */
462                                 kfree(key);
463                         }
464                         return_VALUE(0);
465                         break;
466                 }
467         }
468
469         return_VALUE(-ENODEV);
470 }
471
472 static void free_hotkey_device(union acpi_hotkey *key)
473 {
474         struct acpi_device *dev;
475
476         ACPI_FUNCTION_TRACE("free_hotkey_device");
477
478         if (key->link.hotkey_type == ACPI_HOTKEY_EVENT) {
479                 acpi_bus_get_device(key->event_hotkey.bus_handle, &dev);
480                 if (dev->handle)
481                         acpi_remove_notify_handler(dev->handle,
482                                                    ACPI_DEVICE_NOTIFY,
483                                                    acpi_hotkey_notify_handler);
484                 free_hotkey_buffer(key);
485         } else {
486                 char  proc_name[80];
487
488                 sprintf(proc_name, "%d", key->link.hotkey_standard_num);
489                 /*
490                 strcat(proc_name, key->poll_hotkey.poll_method);
491                 */
492                 remove_proc_entry(proc_name,hotkey_proc_dir);
493                 free_poll_hotkey_buffer(key);
494         }
495         kfree(key);
496         return_VOID;
497 }
498
499 static void
500 free_hotkey_buffer(union acpi_hotkey *key)
501 {
502         kfree(key->event_hotkey.action_method);
503 }
504
505 static void
506 free_poll_hotkey_buffer(union acpi_hotkey *key)
507 {
508         kfree(key->poll_hotkey.action_method);
509         kfree(key->poll_hotkey.poll_method);
510         kfree(key->poll_hotkey.poll_result);
511 }
512 static int
513 init_hotkey_device(union acpi_hotkey *key, char *bus_str, char *action_str,
514                    char *method, int std_num, int external_num)
515 {
516         acpi_handle     tmp_handle;
517         acpi_status status = AE_OK;
518
519         ACPI_FUNCTION_TRACE("init_hotkey_device");
520
521         if(std_num < 0 || IS_POLL(std_num) || !key )
522                 goto do_fail;
523
524         if(!bus_str || !action_str || !method)
525                 goto do_fail;
526
527         key->link.hotkey_type = ACPI_HOTKEY_EVENT;
528         key->link.hotkey_standard_num = std_num;
529         key->event_hotkey.flag = 0;
530         key->event_hotkey.action_method = method;
531
532         status = acpi_get_handle(NULL,bus_str, &(key->event_hotkey.bus_handle));
533         if(ACPI_FAILURE(status))
534                 goto do_fail;
535         key->event_hotkey.external_hotkey_num = external_num;
536         status = acpi_get_handle(NULL,action_str, &(key->event_hotkey.action_handle));
537         if(ACPI_FAILURE(status))
538                 goto do_fail;
539         status = acpi_get_handle(key->event_hotkey.action_handle,
540                                 method, &tmp_handle);
541         if (ACPI_FAILURE(status))
542                 goto do_fail;
543         return_VALUE(AE_OK);
544 do_fail:
545         return_VALUE(-ENODEV);
546 }
547
548 static int
549 init_poll_hotkey_device(union acpi_hotkey *key,
550                         char *poll_str,
551                         char *poll_method,
552                         char *action_str, char *action_method, int std_num)
553 {
554         acpi_status status = AE_OK;
555         acpi_handle     tmp_handle;
556
557         ACPI_FUNCTION_TRACE("init_poll_hotkey_device");
558
559         if(std_num < 0 || IS_EVENT(std_num) || !key)
560                 goto do_fail;
561
562         if(!poll_str || !poll_method || !action_str || !action_method)
563                 goto do_fail;
564
565         key->link.hotkey_type = ACPI_HOTKEY_POLLING;
566         key->link.hotkey_standard_num = std_num;
567         key->poll_hotkey.flag = 0;
568         key->poll_hotkey.poll_method = poll_method;
569         key->poll_hotkey.action_method = action_method;
570
571         status = acpi_get_handle(NULL,poll_str, &(key->poll_hotkey.poll_handle));
572         if(ACPI_FAILURE(status))
573                 goto do_fail;
574         status = acpi_get_handle(key->poll_hotkey.poll_handle,
575                                 poll_method, &tmp_handle);
576         if (ACPI_FAILURE(status))
577                 goto do_fail;
578         status = acpi_get_handle(NULL,action_str, &(key->poll_hotkey.action_handle));
579         if (ACPI_FAILURE(status))
580                 goto do_fail;
581         status = acpi_get_handle(key->poll_hotkey.action_handle,
582                                 action_method, &tmp_handle);
583         if (ACPI_FAILURE(status))
584                 goto do_fail;
585         key->poll_hotkey.poll_result =
586             (union acpi_object *)kmalloc(sizeof(union acpi_object), GFP_KERNEL);
587         if(!key->poll_hotkey.poll_result)
588                 goto do_fail;
589         return_VALUE(AE_OK);
590 do_fail:
591         return_VALUE(-ENODEV);
592 }
593
594
595 static int hotkey_open_config(struct inode *inode, struct file *file)
596 {
597         ACPI_FUNCTION_TRACE("hotkey_open_config");
598         return_VALUE(single_open
599                      (file, hotkey_config_seq_show, PDE(inode)->data));
600 }
601
602 static int hotkey_poll_open_config(struct inode *inode, struct file *file)
603 {
604         ACPI_FUNCTION_TRACE("hotkey_poll_open_config");
605         return_VALUE(single_open
606                      (file, hotkey_poll_config_seq_show, PDE(inode)->data));
607 }
608
609 static int hotkey_config_seq_show(struct seq_file *seq, void *offset)
610 {
611         struct acpi_hotkey_list *hotkey_list = &global_hotkey_list;
612         struct list_head *entries;
613         char bus_name[ACPI_PATHNAME_MAX] = { 0 };
614         char action_name[ACPI_PATHNAME_MAX] = { 0 };
615         struct acpi_buffer bus = { ACPI_PATHNAME_MAX, bus_name };
616         struct acpi_buffer act = { ACPI_PATHNAME_MAX, action_name };
617
618         ACPI_FUNCTION_TRACE(("hotkey_config_seq_show"));
619
620         list_for_each(entries, hotkey_list->entries) {
621                 union acpi_hotkey *key =
622                     container_of(entries, union acpi_hotkey, entries);
623                 if (key->link.hotkey_type == ACPI_HOTKEY_EVENT) {
624                         acpi_get_name(key->event_hotkey.bus_handle,
625                                       ACPI_NAME_TYPE_MAX, &bus);
626                         acpi_get_name(key->event_hotkey.action_handle,
627                                       ACPI_NAME_TYPE_MAX, &act);
628                         seq_printf(seq, "%s:%s:%s:%d:%d\n", bus_name,
629                                    action_name,
630                                    key->event_hotkey.action_method,
631                                    key->link.hotkey_standard_num,
632                                    key->event_hotkey.external_hotkey_num);
633                 }
634         }
635         seq_puts(seq, "\n");
636         return_VALUE(0);
637 }
638
639 static int hotkey_poll_config_seq_show(struct seq_file *seq, void *offset)
640 {
641         struct acpi_hotkey_list *hotkey_list = &global_hotkey_list;
642         struct list_head *entries;
643         char bus_name[ACPI_PATHNAME_MAX] = { 0 };
644         char action_name[ACPI_PATHNAME_MAX] = { 0 };
645         struct acpi_buffer bus = { ACPI_PATHNAME_MAX, bus_name };
646         struct acpi_buffer act = { ACPI_PATHNAME_MAX, action_name };
647
648         ACPI_FUNCTION_TRACE(("hotkey_config_seq_show"));
649
650         list_for_each(entries, hotkey_list->entries) {
651                 union acpi_hotkey *key =
652                     container_of(entries, union acpi_hotkey, entries);
653                 if (key->link.hotkey_type == ACPI_HOTKEY_POLLING) {
654                         acpi_get_name(key->poll_hotkey.poll_handle,
655                                       ACPI_NAME_TYPE_MAX, &bus);
656                         acpi_get_name(key->poll_hotkey.action_handle,
657                                       ACPI_NAME_TYPE_MAX, &act);
658                         seq_printf(seq, "%s:%s:%s:%s:%d\n", bus_name,
659                                    key->poll_hotkey.poll_method,
660                                    action_name,
661                                    key->poll_hotkey.action_method,
662                                    key->link.hotkey_standard_num);
663                 }
664         }
665         seq_puts(seq, "\n");
666         return_VALUE(0);
667 }
668
669 static int
670 get_parms(char *config_record,
671           int *cmd,
672           char **bus_handle,
673           char **bus_method,
674           char **action_handle,
675           char **method, int *internal_event_num, int *external_event_num)
676 {
677         char *tmp, *tmp1, count;
678         ACPI_FUNCTION_TRACE(("get_parms"));
679
680         sscanf(config_record, "%d", cmd);
681
682         if(*cmd == 1){
683                 if(sscanf(config_record, "%d:%d", cmd, internal_event_num)!=2)
684                         goto do_fail;
685                 else
686                         return (6);
687         }
688         tmp = strchr(config_record, ':');
689         if (!tmp)
690                 goto do_fail;
691         tmp++;
692         tmp1 = strchr(tmp, ':');
693         if (!tmp1)
694                 goto do_fail;
695
696         count = tmp1 - tmp;
697         *bus_handle = (char *) kmalloc(count+1, GFP_KERNEL);
698         if(!*bus_handle)
699                 goto do_fail;
700         strncpy(*bus_handle, tmp, count);
701         *(*bus_handle + count) = 0;
702
703         tmp = tmp1;
704         tmp++;
705         tmp1 = strchr(tmp, ':');
706         if (!tmp1)
707                 goto do_fail;
708         count = tmp1 - tmp;
709         *bus_method = (char *) kmalloc(count+1, GFP_KERNEL);
710         if(!*bus_method)
711                 goto do_fail;
712         strncpy(*bus_method, tmp, count);
713         *(*bus_method + count) = 0;
714
715         tmp = tmp1;
716         tmp++;
717         tmp1 = strchr(tmp, ':');
718         if (!tmp1)
719                 goto do_fail;
720         count = tmp1 - tmp;
721         *action_handle = (char *) kmalloc(count+1, GFP_KERNEL);
722         strncpy(*action_handle, tmp, count);
723         *(*action_handle + count) = 0;
724
725         tmp = tmp1;
726         tmp++;
727         tmp1 = strchr(tmp, ':');
728         if (!tmp1)
729                 goto do_fail;
730         count = tmp1 - tmp;
731         *method = (char *) kmalloc(count+1, GFP_KERNEL);
732         if(!*method)
733                 goto do_fail;
734         strncpy(*method, tmp, count);
735         *(*method + count) = 0;
736
737         if(sscanf(tmp1 + 1, "%d:%d", internal_event_num, external_event_num)<=0)
738                 goto do_fail;
739
740         return_VALUE(6);
741 do_fail:
742         return_VALUE(-1);
743 }
744
745 /*  count is length for one input record */
746 static ssize_t hotkey_write_config(struct file *file,
747                                    const char __user * buffer,
748                                    size_t count, loff_t * data)
749 {
750         char *config_record = NULL;
751         char *bus_handle = NULL;
752         char *bus_method = NULL;
753         char *action_handle = NULL;
754         char *method = NULL;
755         int cmd, internal_event_num, external_event_num;
756         int ret = 0;
757         union acpi_hotkey *key = NULL;
758
759         ACPI_FUNCTION_TRACE(("hotkey_write_config"));
760
761         config_record = (char *) kmalloc(count+1, GFP_KERNEL);
762         if(!config_record)
763                 return_VALUE(-ENOMEM);
764
765         if (copy_from_user(config_record, buffer, count)) {
766                 kfree(config_record);
767                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data \n"));
768                 return_VALUE(-EINVAL);
769         }
770         config_record[count] = 0;
771
772         ret = get_parms(config_record,
773                         &cmd,
774                         &bus_handle,
775                         &bus_method,
776                         &action_handle,
777                         &method, &internal_event_num, &external_event_num);
778
779         kfree(config_record);
780         if(IS_OTHERS(internal_event_num))
781                 goto do_fail;
782         if (ret != 6) {
783 do_fail:        
784                 kfree(bus_handle);
785                 kfree(bus_method);
786                 kfree(action_handle);
787                 kfree(method);
788                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
789                                   "Invalid data format ret=%d\n", ret));
790                 return_VALUE(-EINVAL);
791         }
792
793         key = kmalloc(sizeof(union acpi_hotkey), GFP_KERNEL);
794         if(!key)
795                 goto do_fail;
796         memset(key, 0, sizeof(union acpi_hotkey));
797         if(cmd == 1) {
798                 union acpi_hotkey *tmp = NULL;
799                 tmp = get_hotkey_by_event(&global_hotkey_list,
800                                 internal_event_num);
801                 if(!tmp)
802                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid key"));
803                 else
804                         memcpy(key, tmp, sizeof(union acpi_hotkey));
805                 goto cont_cmd;
806         }
807         if (IS_EVENT(internal_event_num)) {
808                 kfree(bus_method);
809                 ret = init_hotkey_device(key, bus_handle, action_handle, method,
810                                  internal_event_num, external_event_num);
811         } else
812                 ret = init_poll_hotkey_device(key, bus_handle, bus_method,
813                                       action_handle, method,
814                                       internal_event_num);
815         if (ret) {
816                 kfree(bus_handle);
817                 kfree(action_handle);
818                 if(IS_EVENT(internal_event_num))
819                         free_hotkey_buffer(key);
820                 else
821                         free_poll_hotkey_buffer(key);
822                 kfree(key);
823                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid hotkey \n"));
824                 return_VALUE(-EINVAL);
825         }
826
827 cont_cmd:
828         kfree(bus_handle);
829         kfree(action_handle);
830
831         switch (cmd) {
832         case 0:
833                 if(get_hotkey_by_event(&global_hotkey_list,key->link.hotkey_standard_num))
834                         goto fail_out;
835                 else
836                         hotkey_add(key);
837                 break;
838         case 1:
839                 hotkey_remove(key);
840                 break;
841         case 2:
842                 if(hotkey_update(key))
843                         goto fail_out;
844                 break;
845         default:
846                 goto fail_out;
847                 break;
848         }
849         return_VALUE(count);
850 fail_out:
851         if(IS_EVENT(internal_event_num))
852                 free_hotkey_buffer(key);
853         else
854                 free_poll_hotkey_buffer(key);
855         kfree(key);
856         ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "invalid key\n"));
857         return_VALUE(-EINVAL);
858 }
859
860 /*
861  * This function evaluates an ACPI method, given an int as parameter, the
862  * method is searched within the scope of the handle, can be NULL. The output
863  * of the method is written is output, which can also be NULL
864  *
865  * returns 1 if write is successful, 0 else.
866  */
867 static int write_acpi_int(acpi_handle handle, const char *method, int val,
868                           struct acpi_buffer *output)
869 {
870         struct acpi_object_list params; /* list of input parameters (an int here) */
871         union acpi_object in_obj;       /* the only param we use */
872         acpi_status status;
873
874         ACPI_FUNCTION_TRACE("write_acpi_int");
875         params.count = 1;
876         params.pointer = &in_obj;
877         in_obj.type = ACPI_TYPE_INTEGER;
878         in_obj.integer.value = val;
879
880         status = acpi_evaluate_object(handle, (char *)method, &params, output);
881
882         return_VALUE(status == AE_OK);
883 }
884
885 static int read_acpi_int(acpi_handle handle, const char *method, union acpi_object *val)
886 {
887         struct acpi_buffer output;
888         union acpi_object out_obj;
889         acpi_status status;
890
891         ACPI_FUNCTION_TRACE("read_acpi_int");
892         output.length = sizeof(out_obj);
893         output.pointer = &out_obj;
894
895         status = acpi_evaluate_object(handle, (char *)method, NULL, &output);
896         if(val){
897                 val->integer.value = out_obj.integer.value;
898                 val->type = out_obj.type;
899         } else
900                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "null val pointer"));
901         return_VALUE((status == AE_OK)
902                      && (out_obj.type == ACPI_TYPE_INTEGER));
903 }
904
905 static union acpi_hotkey *get_hotkey_by_event(struct
906                               acpi_hotkey_list
907                               *hotkey_list, int event)
908 {
909         struct list_head *entries;
910
911         list_for_each(entries, hotkey_list->entries) {
912                 union acpi_hotkey *key =
913                     container_of(entries, union acpi_hotkey, entries);
914                 if (key->link.hotkey_standard_num == event) {
915                         return(key);
916                 }
917         }
918         return(NULL);
919 }
920
921 /*
922  * user call AML method interface:
923  * Call convention:
924  * echo "event_num: arg type : value"
925  * example: echo "1:1:30" > /proc/acpi/action
926  * Just support 1 integer arg passing to AML method
927  */
928
929 static ssize_t hotkey_execute_aml_method(struct file *file,
930                                          const char __user * buffer,
931                                          size_t count, loff_t * data)
932 {
933         struct acpi_hotkey_list *hotkey_list = &global_hotkey_list;
934         char *arg;
935         int event,method_type,type, value;
936         union acpi_hotkey *key;
937
938         ACPI_FUNCTION_TRACE("hotkey_execte_aml_method");
939
940         arg = (char *) kmalloc(count+1, GFP_KERNEL);
941         if(!arg)
942                 return_VALUE(-ENOMEM);
943         arg[count]=0;
944
945         if (copy_from_user(arg, buffer, count)) {
946                 kfree(arg);
947                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid argument 2"));
948                 return_VALUE(-EINVAL);
949         }
950
951         if (sscanf(arg, "%d:%d:%d:%d", &event, &method_type, &type, &value) != 4) {
952                 kfree(arg);
953                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid argument 3"));
954                 return_VALUE(-EINVAL);
955         }
956         kfree(arg);
957         if (type == ACPI_TYPE_INTEGER) {
958                 key = get_hotkey_by_event(hotkey_list, event);
959                 if(!key)
960                         goto do_fail;
961                 if (IS_EVENT(event))
962                         write_acpi_int(key->event_hotkey.action_handle,
963                                         key->event_hotkey.action_method, value, NULL);
964                 else if (IS_POLL(event)) {
965                         if ( method_type == POLL_METHOD )
966                                 read_acpi_int(key->poll_hotkey.poll_handle,
967                                         key->poll_hotkey.poll_method,
968                                         key->poll_hotkey.poll_result);
969                         else if ( method_type == ACTION_METHOD )
970                                 write_acpi_int(key->poll_hotkey.action_handle,
971                                         key->poll_hotkey.action_method, value, NULL);
972                         else
973                                 goto do_fail;
974
975                 }
976         } else {
977                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Not supported"));
978                 return_VALUE(-EINVAL);
979         }
980         return_VALUE(count);
981 do_fail:
982         return_VALUE(-EINVAL);
983
984 }
985
986 static int __init hotkey_init(void)
987 {
988         int result;
989         mode_t mode = S_IFREG | S_IRUGO | S_IWUGO;
990
991         ACPI_FUNCTION_TRACE("hotkey_init");
992
993         if (acpi_disabled)
994                 return -ENODEV;
995
996         if (acpi_specific_hotkey_enabled) {
997                 printk("Using specific hotkey driver\n");
998                 return -ENODEV;
999         }
1000
1001         hotkey_proc_dir = proc_mkdir(HOTKEY_PROC, acpi_root_dir);
1002         if (!hotkey_proc_dir) {
1003                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1004                                   "Hotkey: Unable to create %s entry\n",
1005                                   HOTKEY_PROC));
1006                 return (-ENODEV);
1007         }
1008         hotkey_proc_dir->owner = THIS_MODULE;
1009
1010         hotkey_config =
1011             create_proc_entry(HOTKEY_EV_CONFIG, mode, hotkey_proc_dir);
1012         if (!hotkey_config) {
1013                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1014                                   "Hotkey: Unable to create %s entry\n",
1015                                   HOTKEY_EV_CONFIG));
1016                 goto do_fail1;
1017         } else {
1018                 hotkey_config->proc_fops = &hotkey_config_fops;
1019                 hotkey_config->data = &global_hotkey_list;
1020                 hotkey_config->owner = THIS_MODULE;
1021                 hotkey_config->uid = 0;
1022                 hotkey_config->gid = 0;
1023         }
1024
1025         hotkey_poll_config =
1026             create_proc_entry(HOTKEY_PL_CONFIG, mode, hotkey_proc_dir);
1027         if (!hotkey_poll_config) {
1028                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1029                                   "Hotkey: Unable to create %s entry\n",
1030                                   HOTKEY_EV_CONFIG));
1031
1032                 goto do_fail2;
1033         } else {
1034                 hotkey_poll_config->proc_fops = &hotkey_poll_config_fops;
1035                 hotkey_poll_config->data = &global_hotkey_list;
1036                 hotkey_poll_config->owner = THIS_MODULE;
1037                 hotkey_poll_config->uid = 0;
1038                 hotkey_poll_config->gid = 0;
1039         }
1040
1041         hotkey_action = create_proc_entry(HOTKEY_ACTION, mode, hotkey_proc_dir);
1042         if (!hotkey_action) {
1043                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1044                                   "Hotkey: Unable to create %s entry\n",
1045                                   HOTKEY_ACTION));
1046                 goto do_fail3;
1047         } else {
1048                 hotkey_action->proc_fops = &hotkey_action_fops;
1049                 hotkey_action->owner = THIS_MODULE;
1050                 hotkey_action->uid = 0;
1051                 hotkey_action->gid = 0;
1052         }
1053
1054         hotkey_info = create_proc_entry(HOTKEY_INFO, mode, hotkey_proc_dir);
1055         if (!hotkey_info) {
1056                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1057                                   "Hotkey: Unable to create %s entry\n",
1058                                   HOTKEY_INFO));
1059                 goto do_fail4;
1060         } else {
1061                 hotkey_info->proc_fops = &hotkey_info_fops;
1062                 hotkey_info->owner = THIS_MODULE;
1063                 hotkey_info->uid = 0;
1064                 hotkey_info->gid = 0;
1065         }
1066
1067         result = acpi_bus_register_driver(&hotkey_driver);
1068         if (result < 0)
1069                 goto do_fail5;
1070         global_hotkey_list.count = 0;
1071         global_hotkey_list.entries = &hotkey_entries;
1072
1073         INIT_LIST_HEAD(&hotkey_entries);
1074
1075         return (0);
1076
1077 do_fail5:
1078         remove_proc_entry(HOTKEY_INFO, hotkey_proc_dir);
1079 do_fail4:
1080         remove_proc_entry(HOTKEY_ACTION, hotkey_proc_dir);
1081 do_fail3:
1082         remove_proc_entry(HOTKEY_PL_CONFIG, hotkey_proc_dir);
1083 do_fail2:
1084         remove_proc_entry(HOTKEY_EV_CONFIG, hotkey_proc_dir);
1085 do_fail1:
1086         remove_proc_entry(HOTKEY_PROC, acpi_root_dir);
1087         return (-ENODEV);
1088 }
1089
1090 static void __exit hotkey_exit(void)
1091 {
1092         struct list_head *entries, *next;
1093
1094         ACPI_FUNCTION_TRACE("hotkey_exit");
1095
1096         list_for_each_safe(entries, next, global_hotkey_list.entries) {
1097                 union acpi_hotkey *key =
1098                     container_of(entries, union acpi_hotkey, entries);
1099
1100                 acpi_os_wait_events_complete(NULL);
1101                 list_del(&key->link.entries);
1102                 global_hotkey_list.count--;
1103                 free_hotkey_device(key);
1104         }
1105         acpi_bus_unregister_driver(&hotkey_driver);
1106         remove_proc_entry(HOTKEY_EV_CONFIG, hotkey_proc_dir);
1107         remove_proc_entry(HOTKEY_PL_CONFIG, hotkey_proc_dir);
1108         remove_proc_entry(HOTKEY_ACTION, hotkey_proc_dir);
1109         remove_proc_entry(HOTKEY_INFO, hotkey_proc_dir);
1110         remove_proc_entry(HOTKEY_PROC, acpi_root_dir);
1111         return;
1112 }
1113
1114 module_init(hotkey_init);
1115 module_exit(hotkey_exit);