393dbbca4e85c13c32eed9264b605da7f9abbb3c
[linux-2.6.git] / 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                 return_VALUE(-ENODEV);
360         } else {
361                 proc->proc_fops = &hotkey_polling_fops;
362                 proc->owner = THIS_MODULE;
363                 proc->data = device;
364                 proc->uid = 0;
365                 proc->gid = 0;
366                 device->poll_hotkey.proc = proc;
367         }
368         return_VALUE(0);
369 }
370
371 static int hotkey_add(union acpi_hotkey *device)
372 {
373         int status = 0;
374         struct acpi_device *dev = NULL;
375
376         ACPI_FUNCTION_TRACE("hotkey_add");
377
378         if (device->link.hotkey_type == ACPI_HOTKEY_EVENT) {
379                 acpi_bus_get_device(device->event_hotkey.bus_handle, &dev);
380                 status = acpi_install_notify_handler(dev->handle,
381                                                      ACPI_DEVICE_NOTIFY,
382                                                      acpi_hotkey_notify_handler,
383                                                      dev);
384         } else                  /* Add polling hotkey */
385                 create_polling_proc(device);
386
387         global_hotkey_list.count++;
388
389         list_add_tail(&device->link.entries, global_hotkey_list.entries);
390
391         return_VALUE(status);
392 }
393
394 static int hotkey_remove(union acpi_hotkey *device)
395 {
396         struct list_head *entries, *next;
397
398         ACPI_FUNCTION_TRACE("hotkey_remove");
399
400         list_for_each_safe(entries, next, global_hotkey_list.entries) {
401                 union acpi_hotkey *key =
402                     container_of(entries, union acpi_hotkey, entries);
403                 if (key->link.hotkey_standard_num ==
404                     device->link.hotkey_standard_num) {
405                         list_del(&key->link.entries);
406                         free_hotkey_device(key);
407                         global_hotkey_list.count--;
408                         break;
409                 }
410         }
411         kfree(device);
412         return_VALUE(0);
413 }
414
415 static int hotkey_update(union acpi_hotkey *key)
416 {
417         struct list_head *entries;
418
419         ACPI_FUNCTION_TRACE("hotkey_update");
420
421         list_for_each(entries, global_hotkey_list.entries) {
422                 union acpi_hotkey *tmp =
423                     container_of(entries, union acpi_hotkey, entries);
424                 if (tmp->link.hotkey_standard_num ==
425                     key->link.hotkey_standard_num) {
426                         if (key->link.hotkey_type == ACPI_HOTKEY_EVENT) {
427                                 free_hotkey_buffer(tmp);
428                                 tmp->event_hotkey.bus_handle =
429                                     key->event_hotkey.bus_handle;
430                                 tmp->event_hotkey.external_hotkey_num =
431                                     key->event_hotkey.external_hotkey_num;
432                                 tmp->event_hotkey.action_handle =
433                                     key->event_hotkey.action_handle;
434                                 tmp->event_hotkey.action_method =
435                                     key->event_hotkey.action_method;
436                                 kfree(key);
437                         } else {
438                                 /*
439                                    char  proc_name[80];
440
441                                    sprintf(proc_name, "%d", tmp->link.hotkey_standard_num);
442                                    strcat(proc_name, tmp->poll_hotkey.poll_method);
443                                    remove_proc_entry(proc_name,hotkey_proc_dir);
444                                  */
445                                 free_poll_hotkey_buffer(tmp);
446                                 tmp->poll_hotkey.poll_handle =
447                                     key->poll_hotkey.poll_handle;
448                                 tmp->poll_hotkey.poll_method =
449                                     key->poll_hotkey.poll_method;
450                                 tmp->poll_hotkey.action_handle =
451                                     key->poll_hotkey.action_handle;
452                                 tmp->poll_hotkey.action_method =
453                                     key->poll_hotkey.action_method;
454                                 tmp->poll_hotkey.poll_result =
455                                     key->poll_hotkey.poll_result;
456                                 /*
457                                    create_polling_proc(tmp);
458                                  */
459                                 kfree(key);
460                         }
461                         return_VALUE(0);
462                         break;
463                 }
464         }
465
466         return_VALUE(-ENODEV);
467 }
468
469 static void free_hotkey_device(union acpi_hotkey *key)
470 {
471         struct acpi_device *dev;
472
473         ACPI_FUNCTION_TRACE("free_hotkey_device");
474
475         if (key->link.hotkey_type == ACPI_HOTKEY_EVENT) {
476                 acpi_bus_get_device(key->event_hotkey.bus_handle, &dev);
477                 if (dev->handle)
478                         acpi_remove_notify_handler(dev->handle,
479                                                    ACPI_DEVICE_NOTIFY,
480                                                    acpi_hotkey_notify_handler);
481                 free_hotkey_buffer(key);
482         } else {
483                 char proc_name[80];
484
485                 sprintf(proc_name, "%d", key->link.hotkey_standard_num);
486                 /*
487                    strcat(proc_name, key->poll_hotkey.poll_method);
488                  */
489                 remove_proc_entry(proc_name, hotkey_proc_dir);
490                 free_poll_hotkey_buffer(key);
491         }
492         kfree(key);
493         return_VOID;
494 }
495
496 static void free_hotkey_buffer(union acpi_hotkey *key)
497 {
498         kfree(key->event_hotkey.action_method);
499 }
500
501 static void free_poll_hotkey_buffer(union acpi_hotkey *key)
502 {
503         kfree(key->poll_hotkey.action_method);
504         kfree(key->poll_hotkey.poll_method);
505         kfree(key->poll_hotkey.poll_result);
506 }
507 static int
508 init_hotkey_device(union acpi_hotkey *key, char *bus_str, char *action_str,
509                    char *method, int std_num, int external_num)
510 {
511         acpi_handle tmp_handle;
512         acpi_status status = AE_OK;
513
514         ACPI_FUNCTION_TRACE("init_hotkey_device");
515
516         if (std_num < 0 || IS_POLL(std_num) || !key)
517                 goto do_fail;
518
519         if (!bus_str || !action_str || !method)
520                 goto do_fail;
521
522         key->link.hotkey_type = ACPI_HOTKEY_EVENT;
523         key->link.hotkey_standard_num = std_num;
524         key->event_hotkey.flag = 0;
525         key->event_hotkey.action_method = method;
526
527         status =
528             acpi_get_handle(NULL, bus_str, &(key->event_hotkey.bus_handle));
529         if (ACPI_FAILURE(status))
530                 goto do_fail;
531         key->event_hotkey.external_hotkey_num = external_num;
532         status =
533             acpi_get_handle(NULL, action_str,
534                             &(key->event_hotkey.action_handle));
535         if (ACPI_FAILURE(status))
536                 goto do_fail;
537         status = acpi_get_handle(key->event_hotkey.action_handle,
538                                  method, &tmp_handle);
539         if (ACPI_FAILURE(status))
540                 goto do_fail;
541         return_VALUE(AE_OK);
542       do_fail:
543         return_VALUE(-ENODEV);
544 }
545
546 static int
547 init_poll_hotkey_device(union acpi_hotkey *key,
548                         char *poll_str,
549                         char *poll_method,
550                         char *action_str, char *action_method, int std_num)
551 {
552         acpi_status status = AE_OK;
553         acpi_handle tmp_handle;
554
555         ACPI_FUNCTION_TRACE("init_poll_hotkey_device");
556
557         if (std_num < 0 || IS_EVENT(std_num) || !key)
558                 goto do_fail;
559
560         if (!poll_str || !poll_method || !action_str || !action_method)
561                 goto do_fail;
562
563         key->link.hotkey_type = ACPI_HOTKEY_POLLING;
564         key->link.hotkey_standard_num = std_num;
565         key->poll_hotkey.flag = 0;
566         key->poll_hotkey.poll_method = poll_method;
567         key->poll_hotkey.action_method = action_method;
568
569         status =
570             acpi_get_handle(NULL, poll_str, &(key->poll_hotkey.poll_handle));
571         if (ACPI_FAILURE(status))
572                 goto do_fail;
573         status = acpi_get_handle(key->poll_hotkey.poll_handle,
574                                  poll_method, &tmp_handle);
575         if (ACPI_FAILURE(status))
576                 goto do_fail;
577         status =
578             acpi_get_handle(NULL, action_str,
579                             &(key->poll_hotkey.action_handle));
580         if (ACPI_FAILURE(status))
581                 goto do_fail;
582         status = acpi_get_handle(key->poll_hotkey.action_handle,
583                                  action_method, &tmp_handle);
584         if (ACPI_FAILURE(status))
585                 goto do_fail;
586         key->poll_hotkey.poll_result =
587             (union acpi_object *)kmalloc(sizeof(union acpi_object), GFP_KERNEL);
588         if (!key->poll_hotkey.poll_result)
589                 goto do_fail;
590         return_VALUE(AE_OK);
591       do_fail:
592         return_VALUE(-ENODEV);
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) !=
684                     2)
685                         goto do_fail;
686                 else
687                         return (6);
688         }
689         tmp = strchr(config_record, ':');
690         if (!tmp)
691                 goto do_fail;
692         tmp++;
693         tmp1 = strchr(tmp, ':');
694         if (!tmp1)
695                 goto do_fail;
696
697         count = tmp1 - tmp;
698         *bus_handle = (char *)kmalloc(count + 1, GFP_KERNEL);
699         if (!*bus_handle)
700                 goto do_fail;
701         strncpy(*bus_handle, tmp, count);
702         *(*bus_handle + count) = 0;
703
704         tmp = tmp1;
705         tmp++;
706         tmp1 = strchr(tmp, ':');
707         if (!tmp1)
708                 goto do_fail;
709         count = tmp1 - tmp;
710         *bus_method = (char *)kmalloc(count + 1, GFP_KERNEL);
711         if (!*bus_method)
712                 goto do_fail;
713         strncpy(*bus_method, tmp, count);
714         *(*bus_method + count) = 0;
715
716         tmp = tmp1;
717         tmp++;
718         tmp1 = strchr(tmp, ':');
719         if (!tmp1)
720                 goto do_fail;
721         count = tmp1 - tmp;
722         *action_handle = (char *)kmalloc(count + 1, GFP_KERNEL);
723         if (!*action_handle)
724                 goto do_fail;
725         strncpy(*action_handle, tmp, count);
726         *(*action_handle + count) = 0;
727
728         tmp = tmp1;
729         tmp++;
730         tmp1 = strchr(tmp, ':');
731         if (!tmp1)
732                 goto do_fail;
733         count = tmp1 - tmp;
734         *method = (char *)kmalloc(count + 1, GFP_KERNEL);
735         if (!*method)
736                 goto do_fail;
737         strncpy(*method, tmp, count);
738         *(*method + count) = 0;
739
740         if (sscanf(tmp1 + 1, "%d:%d", internal_event_num, external_event_num) <=
741             0)
742                 goto do_fail;
743
744         return_VALUE(6);
745       do_fail:
746         return_VALUE(-1);
747 }
748
749 /*  count is length for one input record */
750 static ssize_t hotkey_write_config(struct file *file,
751                                    const char __user * buffer,
752                                    size_t count, loff_t * data)
753 {
754         char *config_record = NULL;
755         char *bus_handle = NULL;
756         char *bus_method = NULL;
757         char *action_handle = NULL;
758         char *method = NULL;
759         int cmd, internal_event_num, external_event_num;
760         int ret = 0;
761         union acpi_hotkey *key = NULL;
762
763         ACPI_FUNCTION_TRACE(("hotkey_write_config"));
764
765         config_record = (char *)kmalloc(count + 1, GFP_KERNEL);
766         if (!config_record)
767                 return_VALUE(-ENOMEM);
768
769         if (copy_from_user(config_record, buffer, count)) {
770                 kfree(config_record);
771                 printk(KERN_ERR PREFIX "Invalid data\n");
772                 return_VALUE(-EINVAL);
773         }
774         config_record[count] = 0;
775
776         ret = get_parms(config_record,
777                         &cmd,
778                         &bus_handle,
779                         &bus_method,
780                         &action_handle,
781                         &method, &internal_event_num, &external_event_num);
782
783         kfree(config_record);
784         if (IS_OTHERS(internal_event_num))
785                 goto do_fail;
786         if (ret != 6) {
787               do_fail:
788                 kfree(bus_handle);
789                 kfree(bus_method);
790                 kfree(action_handle);
791                 kfree(method);
792                 printk(KERN_ERR PREFIX "Invalid data format ret=%d\n", ret);
793                 return_VALUE(-EINVAL);
794         }
795
796         key = kmalloc(sizeof(union acpi_hotkey), GFP_KERNEL);
797         if (!key)
798                 goto do_fail;
799         memset(key, 0, sizeof(union acpi_hotkey));
800         if (cmd == 1) {
801                 union acpi_hotkey *tmp = NULL;
802                 tmp = get_hotkey_by_event(&global_hotkey_list,
803                                           internal_event_num);
804                 if (!tmp)
805                         printk(KERN_ERR PREFIX "Invalid key\n");
806                 else
807                         memcpy(key, tmp, sizeof(union acpi_hotkey));
808                 goto cont_cmd;
809         }
810         if (IS_EVENT(internal_event_num)) {
811                 kfree(bus_method);
812                 ret = init_hotkey_device(key, bus_handle, action_handle, method,
813                                          internal_event_num,
814                                          external_event_num);
815         } else
816                 ret = init_poll_hotkey_device(key, bus_handle, bus_method,
817                                               action_handle, method,
818                                               internal_event_num);
819         if (ret) {
820                 kfree(bus_handle);
821                 kfree(action_handle);
822                 if (IS_EVENT(internal_event_num))
823                         free_hotkey_buffer(key);
824                 else
825                         free_poll_hotkey_buffer(key);
826                 kfree(key);
827                 printk(KERN_ERR PREFIX "Invalid hotkey\n");
828                 return_VALUE(-EINVAL);
829         }
830
831       cont_cmd:
832         kfree(bus_handle);
833         kfree(action_handle);
834
835         switch (cmd) {
836         case 0:
837                 if (get_hotkey_by_event
838                     (&global_hotkey_list, key->link.hotkey_standard_num))
839                         goto fail_out;
840                 else
841                         hotkey_add(key);
842                 break;
843         case 1:
844                 hotkey_remove(key);
845                 break;
846         case 2:
847                 if (hotkey_update(key))
848                         goto fail_out;
849                 break;
850         default:
851                 goto fail_out;
852                 break;
853         }
854         return_VALUE(count);
855       fail_out:
856         if (IS_EVENT(internal_event_num))
857                 free_hotkey_buffer(key);
858         else
859                 free_poll_hotkey_buffer(key);
860         kfree(key);
861         printk(KERN_ERR PREFIX "invalid key\n");
862         return_VALUE(-EINVAL);
863 }
864
865 /*
866  * This function evaluates an ACPI method, given an int as parameter, the
867  * method is searched within the scope of the handle, can be NULL. The output
868  * of the method is written is output, which can also be NULL
869  *
870  * returns 1 if write is successful, 0 else.
871  */
872 static int write_acpi_int(acpi_handle handle, const char *method, int val,
873                           struct acpi_buffer *output)
874 {
875         struct acpi_object_list params; /* list of input parameters (an int here) */
876         union acpi_object in_obj;       /* the only param we use */
877         acpi_status status;
878
879         ACPI_FUNCTION_TRACE("write_acpi_int");
880         params.count = 1;
881         params.pointer = &in_obj;
882         in_obj.type = ACPI_TYPE_INTEGER;
883         in_obj.integer.value = val;
884
885         status = acpi_evaluate_object(handle, (char *)method, &params, output);
886
887         return_VALUE(status == AE_OK);
888 }
889
890 static int read_acpi_int(acpi_handle handle, const char *method,
891                          union acpi_object *val)
892 {
893         struct acpi_buffer output;
894         union acpi_object out_obj;
895         acpi_status status;
896
897         ACPI_FUNCTION_TRACE("read_acpi_int");
898         output.length = sizeof(out_obj);
899         output.pointer = &out_obj;
900
901         status = acpi_evaluate_object(handle, (char *)method, NULL, &output);
902         if (val) {
903                 val->integer.value = out_obj.integer.value;
904                 val->type = out_obj.type;
905         } else
906                 printk(KERN_ERR PREFIX "null val pointer\n");
907         return_VALUE((status == AE_OK)
908                      && (out_obj.type == ACPI_TYPE_INTEGER));
909 }
910
911 static union acpi_hotkey *get_hotkey_by_event(struct
912                                               acpi_hotkey_list
913                                               *hotkey_list, int event)
914 {
915         struct list_head *entries;
916
917         list_for_each(entries, hotkey_list->entries) {
918                 union acpi_hotkey *key =
919                     container_of(entries, union acpi_hotkey, entries);
920                 if (key->link.hotkey_standard_num == event) {
921                         return (key);
922                 }
923         }
924         return (NULL);
925 }
926
927 /*
928  * user call AML method interface:
929  * Call convention:
930  * echo "event_num: arg type : value"
931  * example: echo "1:1:30" > /proc/acpi/action
932  * Just support 1 integer arg passing to AML method
933  */
934
935 static ssize_t hotkey_execute_aml_method(struct file *file,
936                                          const char __user * buffer,
937                                          size_t count, loff_t * data)
938 {
939         struct acpi_hotkey_list *hotkey_list = &global_hotkey_list;
940         char *arg;
941         int event, method_type, type, value;
942         union acpi_hotkey *key;
943
944         ACPI_FUNCTION_TRACE("hotkey_execte_aml_method");
945
946         arg = (char *)kmalloc(count + 1, GFP_KERNEL);
947         if (!arg)
948                 return_VALUE(-ENOMEM);
949         arg[count] = 0;
950
951         if (copy_from_user(arg, buffer, count)) {
952                 kfree(arg);
953                 printk(KERN_ERR PREFIX "Invalid argument 2\n");
954                 return_VALUE(-EINVAL);
955         }
956
957         if (sscanf(arg, "%d:%d:%d:%d", &event, &method_type, &type, &value) !=
958             4) {
959                 kfree(arg);
960                 printk(KERN_ERR PREFIX "Invalid argument 3\n");
961                 return_VALUE(-EINVAL);
962         }
963         kfree(arg);
964         if (type == ACPI_TYPE_INTEGER) {
965                 key = get_hotkey_by_event(hotkey_list, event);
966                 if (!key)
967                         goto do_fail;
968                 if (IS_EVENT(event))
969                         write_acpi_int(key->event_hotkey.action_handle,
970                                        key->event_hotkey.action_method, value,
971                                        NULL);
972                 else if (IS_POLL(event)) {
973                         if (method_type == POLL_METHOD)
974                                 read_acpi_int(key->poll_hotkey.poll_handle,
975                                               key->poll_hotkey.poll_method,
976                                               key->poll_hotkey.poll_result);
977                         else if (method_type == ACTION_METHOD)
978                                 write_acpi_int(key->poll_hotkey.action_handle,
979                                                key->poll_hotkey.action_method,
980                                                value, NULL);
981                         else
982                                 goto do_fail;
983
984                 }
985         } else {
986                 printk(KERN_WARNING "Not supported\n");
987                 return_VALUE(-EINVAL);
988         }
989         return_VALUE(count);
990       do_fail:
991         return_VALUE(-EINVAL);
992
993 }
994
995 static int __init hotkey_init(void)
996 {
997         int result;
998         mode_t mode = S_IFREG | S_IRUGO | S_IWUGO;
999
1000         ACPI_FUNCTION_TRACE("hotkey_init");
1001
1002         if (acpi_disabled)
1003                 return -ENODEV;
1004
1005         if (acpi_specific_hotkey_enabled) {
1006                 printk("Using specific hotkey driver\n");
1007                 return -ENODEV;
1008         }
1009
1010         hotkey_proc_dir = proc_mkdir(HOTKEY_PROC, acpi_root_dir);
1011         if (!hotkey_proc_dir) {
1012                 return (-ENODEV);
1013         }
1014         hotkey_proc_dir->owner = THIS_MODULE;
1015
1016         hotkey_config =
1017             create_proc_entry(HOTKEY_EV_CONFIG, mode, hotkey_proc_dir);
1018         if (!hotkey_config) {
1019                 goto do_fail1;
1020         } else {
1021                 hotkey_config->proc_fops = &hotkey_config_fops;
1022                 hotkey_config->data = &global_hotkey_list;
1023                 hotkey_config->owner = THIS_MODULE;
1024                 hotkey_config->uid = 0;
1025                 hotkey_config->gid = 0;
1026         }
1027
1028         hotkey_poll_config =
1029             create_proc_entry(HOTKEY_PL_CONFIG, mode, hotkey_proc_dir);
1030         if (!hotkey_poll_config) {
1031                 goto do_fail2;
1032         } else {
1033                 hotkey_poll_config->proc_fops = &hotkey_poll_config_fops;
1034                 hotkey_poll_config->data = &global_hotkey_list;
1035                 hotkey_poll_config->owner = THIS_MODULE;
1036                 hotkey_poll_config->uid = 0;
1037                 hotkey_poll_config->gid = 0;
1038         }
1039
1040         hotkey_action = create_proc_entry(HOTKEY_ACTION, mode, hotkey_proc_dir);
1041         if (!hotkey_action) {
1042                 goto do_fail3;
1043         } else {
1044                 hotkey_action->proc_fops = &hotkey_action_fops;
1045                 hotkey_action->owner = THIS_MODULE;
1046                 hotkey_action->uid = 0;
1047                 hotkey_action->gid = 0;
1048         }
1049
1050         hotkey_info = create_proc_entry(HOTKEY_INFO, mode, hotkey_proc_dir);
1051         if (!hotkey_info) {
1052                 goto do_fail4;
1053         } else {
1054                 hotkey_info->proc_fops = &hotkey_info_fops;
1055                 hotkey_info->owner = THIS_MODULE;
1056                 hotkey_info->uid = 0;
1057                 hotkey_info->gid = 0;
1058         }
1059
1060         result = acpi_bus_register_driver(&hotkey_driver);
1061         if (result < 0)
1062                 goto do_fail5;
1063         global_hotkey_list.count = 0;
1064         global_hotkey_list.entries = &hotkey_entries;
1065
1066         INIT_LIST_HEAD(&hotkey_entries);
1067
1068         return (0);
1069
1070       do_fail5:
1071         remove_proc_entry(HOTKEY_INFO, hotkey_proc_dir);
1072       do_fail4:
1073         remove_proc_entry(HOTKEY_ACTION, hotkey_proc_dir);
1074       do_fail3:
1075         remove_proc_entry(HOTKEY_PL_CONFIG, hotkey_proc_dir);
1076       do_fail2:
1077         remove_proc_entry(HOTKEY_EV_CONFIG, hotkey_proc_dir);
1078       do_fail1:
1079         remove_proc_entry(HOTKEY_PROC, acpi_root_dir);
1080         return (-ENODEV);
1081 }
1082
1083 static void __exit hotkey_exit(void)
1084 {
1085         struct list_head *entries, *next;
1086
1087         ACPI_FUNCTION_TRACE("hotkey_exit");
1088
1089         list_for_each_safe(entries, next, global_hotkey_list.entries) {
1090                 union acpi_hotkey *key =
1091                     container_of(entries, union acpi_hotkey, entries);
1092
1093                 acpi_os_wait_events_complete(NULL);
1094                 list_del(&key->link.entries);
1095                 global_hotkey_list.count--;
1096                 free_hotkey_device(key);
1097         }
1098         acpi_bus_unregister_driver(&hotkey_driver);
1099         remove_proc_entry(HOTKEY_EV_CONFIG, hotkey_proc_dir);
1100         remove_proc_entry(HOTKEY_PL_CONFIG, hotkey_proc_dir);
1101         remove_proc_entry(HOTKEY_ACTION, hotkey_proc_dir);
1102         remove_proc_entry(HOTKEY_INFO, hotkey_proc_dir);
1103         remove_proc_entry(HOTKEY_PROC, acpi_root_dir);
1104         return;
1105 }
1106
1107 module_init(hotkey_init);
1108 module_exit(hotkey_exit);