ACPI: Remove unnecessary from/to-void* and to-void casts in drivers/acpi
[linux-2.6.git] / drivers / acpi / asus_acpi.c
1 /*
2  *  asus_acpi.c - Asus Laptop ACPI Extras
3  *
4  *
5  *  Copyright (C) 2002-2005 Julien Lerouge, 2003-2006 Karol Kozimor
6  *
7  *  This program is free software; you can redistribute it and/or modify
8  *  it under the terms of the GNU General Public License as published by
9  *  the Free Software Foundation; either version 2 of the License, or
10  *  (at your option) any later version.
11  *
12  *  This program is distributed in the hope that it will be useful,
13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  *  GNU General Public License for more details.
16  *
17  *  You should have received a copy of the GNU General Public License
18  *  along with this program; if not, write to the Free Software
19  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
20  *
21  *
22  *  The development page for this driver is located at
23  *  http://sourceforge.net/projects/acpi4asus/
24  *
25  *  Credits:
26  *  Pontus Fuchs   - Helper functions, cleanup
27  *  Johann Wiesner - Small compile fixes
28  *  John Belmonte  - ACPI code for Toshiba laptop was a good starting point.
29  *  √Čric Burghard  - LED display support for W1N
30  *
31  */
32
33 #include <linux/kernel.h>
34 #include <linux/module.h>
35 #include <linux/init.h>
36 #include <linux/types.h>
37 #include <linux/proc_fs.h>
38 #include <acpi/acpi_drivers.h>
39 #include <acpi/acpi_bus.h>
40 #include <asm/uaccess.h>
41
42 #define ASUS_ACPI_VERSION "0.30"
43
44 #define PROC_ASUS       "asus"  //the directory
45 #define PROC_MLED       "mled"
46 #define PROC_WLED       "wled"
47 #define PROC_TLED       "tled"
48 #define PROC_BT         "bluetooth"
49 #define PROC_LEDD       "ledd"
50 #define PROC_INFO       "info"
51 #define PROC_LCD        "lcd"
52 #define PROC_BRN        "brn"
53 #define PROC_DISP       "disp"
54
55 #define ACPI_HOTK_NAME          "Asus Laptop ACPI Extras Driver"
56 #define ACPI_HOTK_CLASS         "hotkey"
57 #define ACPI_HOTK_DEVICE_NAME   "Hotkey"
58 #define ACPI_HOTK_HID           "ATK0100"
59
60 /*
61  * Some events we use, same for all Asus
62  */
63 #define BR_UP       0x10
64 #define BR_DOWN     0x20
65
66 /*
67  * Flags for hotk status
68  */
69 #define MLED_ON     0x01        //mail LED
70 #define WLED_ON     0x02        //wireless LED
71 #define TLED_ON     0x04        //touchpad LED
72 #define BT_ON       0x08        //internal Bluetooth
73
74 MODULE_AUTHOR("Julien Lerouge, Karol Kozimor");
75 MODULE_DESCRIPTION(ACPI_HOTK_NAME);
76 MODULE_LICENSE("GPL");
77
78 static uid_t asus_uid;
79 static gid_t asus_gid;
80 module_param(asus_uid, uint, 0);
81 MODULE_PARM_DESC(asus_uid, "UID for entries in /proc/acpi/asus.\n");
82 module_param(asus_gid, uint, 0);
83 MODULE_PARM_DESC(asus_gid, "GID for entries in /proc/acpi/asus.\n");
84
85 /* For each model, all features implemented, 
86  * those marked with R are relative to HOTK, A for absolute */
87 struct model_data {
88         char *name;             //name of the laptop________________A
89         char *mt_mled;          //method to handle mled_____________R
90         char *mled_status;      //node to handle mled reading_______A
91         char *mt_wled;          //method to handle wled_____________R
92         char *wled_status;      //node to handle wled reading_______A
93         char *mt_tled;          //method to handle tled_____________R
94         char *tled_status;      //node to handle tled reading_______A
95         char *mt_ledd;          //method to handle LED display______R
96         char *mt_bt_switch;     //method to switch Bluetooth on/off_R
97         char *bt_status;        //no model currently supports this__?
98         char *mt_lcd_switch;    //method to turn LCD on/off_________A
99         char *lcd_status;       //node to read LCD panel state______A
100         char *brightness_up;    //method to set brightness up_______A
101         char *brightness_down;  //guess what ?______________________A
102         char *brightness_set;   //method to set absolute brightness_R
103         char *brightness_get;   //method to get absolute brightness_R
104         char *brightness_status;        //node to get brightness____________A
105         char *display_set;      //method to set video output________R
106         char *display_get;      //method to get video output________R
107 };
108
109 /*
110  * This is the main structure, we can use it to store anything interesting
111  * about the hotk device
112  */
113 struct asus_hotk {
114         struct acpi_device *device;     //the device we are in
115         acpi_handle handle;     //the handle of the hotk device
116         char status;            //status of the hotk, for LEDs, ...
117         u32 ledd_status;        //status of the LED display
118         struct model_data *methods;     //methods available on the laptop
119         u8 brightness;          //brightness level
120         enum {
121                 A1x = 0,        //A1340D, A1300F
122                 A2x,            //A2500H
123                 A4G,            //A4700G
124                 D1x,            //D1
125                 L2D,            //L2000D
126                 L3C,            //L3800C
127                 L3D,            //L3400D
128                 L3H,            //L3H, L2000E, L5D
129                 L4R,            //L4500R
130                 L5x,            //L5800C 
131                 L8L,            //L8400L
132                 M1A,            //M1300A
133                 M2E,            //M2400E, L4400L
134                 M6N,            //M6800N, W3400N
135                 M6R,            //M6700R, A3000G
136                 P30,            //Samsung P30
137                 S1x,            //S1300A, but also L1400B and M2400A (L84F)
138                 S2x,            //S200 (J1 reported), Victor MP-XP7210
139                 W1N,            //W1000N
140                 W5A,            //W5A
141                 xxN,            //M2400N, M3700N, M5200N, M6800N, S1300N, S5200N
142                 //(Centrino)
143                 END_MODEL
144         } model;                //Models currently supported
145         u16 event_count[128];   //count for each event TODO make this better
146 };
147
148 /* Here we go */
149 #define A1x_PREFIX "\\_SB.PCI0.ISA.EC0."
150 #define L3C_PREFIX "\\_SB.PCI0.PX40.ECD0."
151 #define M1A_PREFIX "\\_SB.PCI0.PX40.EC0."
152 #define P30_PREFIX "\\_SB.PCI0.LPCB.EC0."
153 #define S1x_PREFIX "\\_SB.PCI0.PX40."
154 #define S2x_PREFIX A1x_PREFIX
155 #define xxN_PREFIX "\\_SB.PCI0.SBRG.EC0."
156
157 static struct model_data model_conf[END_MODEL] = {
158         /*
159          * TODO I have seen a SWBX and AIBX method on some models, like L1400B,
160          * it seems to be a kind of switch, but what for ?
161          */
162
163         {
164          .name = "A1x",
165          .mt_mled = "MLED",
166          .mled_status = "\\MAIL",
167          .mt_lcd_switch = A1x_PREFIX "_Q10",
168          .lcd_status = "\\BKLI",
169          .brightness_up = A1x_PREFIX "_Q0E",
170          .brightness_down = A1x_PREFIX "_Q0F"},
171
172         {
173          .name = "A2x",
174          .mt_mled = "MLED",
175          .mt_wled = "WLED",
176          .wled_status = "\\SG66",
177          .mt_lcd_switch = "\\Q10",
178          .lcd_status = "\\BAOF",
179          .brightness_set = "SPLV",
180          .brightness_get = "GPLV",
181          .display_set = "SDSP",
182          .display_get = "\\INFB"},
183
184         {
185          .name = "A4G",
186          .mt_mled = "MLED",
187 /* WLED present, but not controlled by ACPI */
188          .mt_lcd_switch = xxN_PREFIX "_Q10",
189          .brightness_set = "SPLV",
190          .brightness_get = "GPLV",
191          .display_set = "SDSP",
192          .display_get = "\\ADVG"},
193
194         {
195          .name = "D1x",
196          .mt_mled = "MLED",
197          .mt_lcd_switch = "\\Q0D",
198          .lcd_status = "\\GP11",
199          .brightness_up = "\\Q0C",
200          .brightness_down = "\\Q0B",
201          .brightness_status = "\\BLVL",
202          .display_set = "SDSP",
203          .display_get = "\\INFB"},
204
205         {
206          .name = "L2D",
207          .mt_mled = "MLED",
208          .mled_status = "\\SGP6",
209          .mt_wled = "WLED",
210          .wled_status = "\\RCP3",
211          .mt_lcd_switch = "\\Q10",
212          .lcd_status = "\\SGP0",
213          .brightness_up = "\\Q0E",
214          .brightness_down = "\\Q0F",
215          .display_set = "SDSP",
216          .display_get = "\\INFB"},
217
218         {
219          .name = "L3C",
220          .mt_mled = "MLED",
221          .mt_wled = "WLED",
222          .mt_lcd_switch = L3C_PREFIX "_Q10",
223          .lcd_status = "\\GL32",
224          .brightness_set = "SPLV",
225          .brightness_get = "GPLV",
226          .display_set = "SDSP",
227          .display_get = "\\_SB.PCI0.PCI1.VGAC.NMAP"},
228
229         {
230          .name = "L3D",
231          .mt_mled = "MLED",
232          .mled_status = "\\MALD",
233          .mt_wled = "WLED",
234          .mt_lcd_switch = "\\Q10",
235          .lcd_status = "\\BKLG",
236          .brightness_set = "SPLV",
237          .brightness_get = "GPLV",
238          .display_set = "SDSP",
239          .display_get = "\\INFB"},
240
241         {
242          .name = "L3H",
243          .mt_mled = "MLED",
244          .mt_wled = "WLED",
245          .mt_lcd_switch = "EHK",
246          .lcd_status = "\\_SB.PCI0.PM.PBC",
247          .brightness_set = "SPLV",
248          .brightness_get = "GPLV",
249          .display_set = "SDSP",
250          .display_get = "\\INFB"},
251
252         {
253          .name = "L4R",
254          .mt_mled = "MLED",
255          .mt_wled = "WLED",
256          .wled_status = "\\_SB.PCI0.SBRG.SG13",
257          .mt_lcd_switch = xxN_PREFIX "_Q10",
258          .lcd_status = "\\_SB.PCI0.SBSM.SEO4",
259          .brightness_set = "SPLV",
260          .brightness_get = "GPLV",
261          .display_set = "SDSP",
262          .display_get = "\\_SB.PCI0.P0P1.VGA.GETD"},
263
264         {
265          .name = "L5x",
266          .mt_mled = "MLED",
267 /* WLED present, but not controlled by ACPI */
268          .mt_tled = "TLED",
269          .mt_lcd_switch = "\\Q0D",
270          .lcd_status = "\\BAOF",
271          .brightness_set = "SPLV",
272          .brightness_get = "GPLV",
273          .display_set = "SDSP",
274          .display_get = "\\INFB"},
275
276         {
277          .name = "L8L"
278 /* No features, but at least support the hotkeys */
279          },
280
281         {
282          .name = "M1A",
283          .mt_mled = "MLED",
284          .mt_lcd_switch = M1A_PREFIX "Q10",
285          .lcd_status = "\\PNOF",
286          .brightness_up = M1A_PREFIX "Q0E",
287          .brightness_down = M1A_PREFIX "Q0F",
288          .brightness_status = "\\BRIT",
289          .display_set = "SDSP",
290          .display_get = "\\INFB"},
291
292         {
293          .name = "M2E",
294          .mt_mled = "MLED",
295          .mt_wled = "WLED",
296          .mt_lcd_switch = "\\Q10",
297          .lcd_status = "\\GP06",
298          .brightness_set = "SPLV",
299          .brightness_get = "GPLV",
300          .display_set = "SDSP",
301          .display_get = "\\INFB"},
302
303         {
304          .name = "M6N",
305          .mt_mled = "MLED",
306          .mt_wled = "WLED",
307          .wled_status = "\\_SB.PCI0.SBRG.SG13",
308          .mt_lcd_switch = xxN_PREFIX "_Q10",
309          .lcd_status = "\\_SB.BKLT",
310          .brightness_set = "SPLV",
311          .brightness_get = "GPLV",
312          .display_set = "SDSP",
313          .display_get = "\\SSTE"},
314
315         {
316          .name = "M6R",
317          .mt_mled = "MLED",
318          .mt_wled = "WLED",
319          .mt_lcd_switch = xxN_PREFIX "_Q10",
320          .lcd_status = "\\_SB.PCI0.SBSM.SEO4",
321          .brightness_set = "SPLV",
322          .brightness_get = "GPLV",
323          .display_set = "SDSP",
324          .display_get = "\\_SB.PCI0.P0P1.VGA.GETD"},
325
326         {
327          .name = "P30",
328          .mt_wled = "WLED",
329          .mt_lcd_switch = P30_PREFIX "_Q0E",
330          .lcd_status = "\\BKLT",
331          .brightness_up = P30_PREFIX "_Q68",
332          .brightness_down = P30_PREFIX "_Q69",
333          .brightness_get = "GPLV",
334          .display_set = "SDSP",
335          .display_get = "\\DNXT"},
336
337         {
338          .name = "S1x",
339          .mt_mled = "MLED",
340          .mled_status = "\\EMLE",
341          .mt_wled = "WLED",
342          .mt_lcd_switch = S1x_PREFIX "Q10",
343          .lcd_status = "\\PNOF",
344          .brightness_set = "SPLV",
345          .brightness_get = "GPLV"},
346
347         {
348          .name = "S2x",
349          .mt_mled = "MLED",
350          .mled_status = "\\MAIL",
351          .mt_lcd_switch = S2x_PREFIX "_Q10",
352          .lcd_status = "\\BKLI",
353          .brightness_up = S2x_PREFIX "_Q0B",
354          .brightness_down = S2x_PREFIX "_Q0A"},
355
356         {
357          .name = "W1N",
358          .mt_mled = "MLED",
359          .mt_wled = "WLED",
360          .mt_ledd = "SLCM",
361          .mt_lcd_switch = xxN_PREFIX "_Q10",
362          .lcd_status = "\\BKLT",
363          .brightness_set = "SPLV",
364          .brightness_get = "GPLV",
365          .display_set = "SDSP",
366          .display_get = "\\ADVG"},
367
368         {
369          .name = "W5A",
370          .mt_bt_switch = "BLED",
371          .mt_wled = "WLED",
372          .mt_lcd_switch = xxN_PREFIX "_Q10",
373          .brightness_set = "SPLV",
374          .brightness_get = "GPLV",
375          .display_set = "SDSP",
376          .display_get = "\\ADVG"},
377
378         {
379          .name = "xxN",
380          .mt_mled = "MLED",
381 /* WLED present, but not controlled by ACPI */
382          .mt_lcd_switch = xxN_PREFIX "_Q10",
383          .lcd_status = "\\BKLT",
384          .brightness_set = "SPLV",
385          .brightness_get = "GPLV",
386          .display_set = "SDSP",
387          .display_get = "\\ADVG"}
388 };
389
390 /* procdir we use */
391 static struct proc_dir_entry *asus_proc_dir;
392
393 /*
394  * This header is made available to allow proper configuration given model,
395  * revision number , ... this info cannot go in struct asus_hotk because it is
396  * available before the hotk
397  */
398 static struct acpi_table_header *asus_info;
399
400 /* The actual device the driver binds to */
401 static struct asus_hotk *hotk;
402
403 /*
404  * The hotkey driver declaration
405  */
406 static int asus_hotk_add(struct acpi_device *device);
407 static int asus_hotk_remove(struct acpi_device *device, int type);
408 static struct acpi_driver asus_hotk_driver = {
409         .name = ACPI_HOTK_NAME,
410         .class = ACPI_HOTK_CLASS,
411         .ids = ACPI_HOTK_HID,
412         .ops = {
413                 .add = asus_hotk_add,
414                 .remove = asus_hotk_remove,
415                 },
416 };
417
418 /* 
419  * This function evaluates an ACPI method, given an int as parameter, the
420  * method is searched within the scope of the handle, can be NULL. The output
421  * of the method is written is output, which can also be NULL
422  *
423  * returns 1 if write is successful, 0 else. 
424  */
425 static int write_acpi_int(acpi_handle handle, const char *method, int val,
426                           struct acpi_buffer *output)
427 {
428         struct acpi_object_list params; //list of input parameters (an int here)
429         union acpi_object in_obj;       //the only param we use
430         acpi_status status;
431
432         params.count = 1;
433         params.pointer = &in_obj;
434         in_obj.type = ACPI_TYPE_INTEGER;
435         in_obj.integer.value = val;
436
437         status = acpi_evaluate_object(handle, (char *)method, &params, output);
438         return (status == AE_OK);
439 }
440
441 static int read_acpi_int(acpi_handle handle, const char *method, int *val)
442 {
443         struct acpi_buffer output;
444         union acpi_object out_obj;
445         acpi_status status;
446
447         output.length = sizeof(out_obj);
448         output.pointer = &out_obj;
449
450         status = acpi_evaluate_object(handle, (char *)method, NULL, &output);
451         *val = out_obj.integer.value;
452         return (status == AE_OK) && (out_obj.type == ACPI_TYPE_INTEGER);
453 }
454
455 /*
456  * We write our info in page, we begin at offset off and cannot write more
457  * than count bytes. We set eof to 1 if we handle those 2 values. We return the
458  * number of bytes written in page
459  */
460 static int
461 proc_read_info(char *page, char **start, off_t off, int count, int *eof,
462                void *data)
463 {
464         int len = 0;
465         int temp;
466         char buf[16];           //enough for all info
467         /*
468          * We use the easy way, we don't care of off and count, so we don't set eof
469          * to 1
470          */
471
472         len += sprintf(page, ACPI_HOTK_NAME " " ASUS_ACPI_VERSION "\n");
473         len += sprintf(page + len, "Model reference    : %s\n",
474                        hotk->methods->name);
475         /* 
476          * The SFUN method probably allows the original driver to get the list 
477          * of features supported by a given model. For now, 0x0100 or 0x0800 
478          * bit signifies that the laptop is equipped with a Wi-Fi MiniPCI card.
479          * The significance of others is yet to be found.
480          */
481         if (read_acpi_int(hotk->handle, "SFUN", &temp))
482                 len +=
483                     sprintf(page + len, "SFUN value         : 0x%04x\n", temp);
484         /*
485          * Another value for userspace: the ASYM method returns 0x02 for
486          * battery low and 0x04 for battery critical, its readings tend to be
487          * more accurate than those provided by _BST. 
488          * Note: since not all the laptops provide this method, errors are
489          * silently ignored.
490          */
491         if (read_acpi_int(hotk->handle, "ASYM", &temp))
492                 len +=
493                     sprintf(page + len, "ASYM value         : 0x%04x\n", temp);
494         if (asus_info) {
495                 snprintf(buf, 16, "%d", asus_info->length);
496                 len += sprintf(page + len, "DSDT length        : %s\n", buf);
497                 snprintf(buf, 16, "%d", asus_info->checksum);
498                 len += sprintf(page + len, "DSDT checksum      : %s\n", buf);
499                 snprintf(buf, 16, "%d", asus_info->revision);
500                 len += sprintf(page + len, "DSDT revision      : %s\n", buf);
501                 snprintf(buf, 7, "%s", asus_info->oem_id);
502                 len += sprintf(page + len, "OEM id             : %s\n", buf);
503                 snprintf(buf, 9, "%s", asus_info->oem_table_id);
504                 len += sprintf(page + len, "OEM table id       : %s\n", buf);
505                 snprintf(buf, 16, "%x", asus_info->oem_revision);
506                 len += sprintf(page + len, "OEM revision       : 0x%s\n", buf);
507                 snprintf(buf, 5, "%s", asus_info->asl_compiler_id);
508                 len += sprintf(page + len, "ASL comp vendor id : %s\n", buf);
509                 snprintf(buf, 16, "%x", asus_info->asl_compiler_revision);
510                 len += sprintf(page + len, "ASL comp revision  : 0x%s\n", buf);
511         }
512
513         return len;
514 }
515
516 /*
517  * /proc handlers
518  * We write our info in page, we begin at offset off and cannot write more
519  * than count bytes. We set eof to 1 if we handle those 2 values. We return the
520  * number of bytes written in page
521  */
522
523 /* Generic LED functions */
524 static int read_led(const char *ledname, int ledmask)
525 {
526         if (ledname) {
527                 int led_status;
528
529                 if (read_acpi_int(NULL, ledname, &led_status))
530                         return led_status;
531                 else
532                         printk(KERN_WARNING "Asus ACPI: Error reading LED "
533                                "status\n");
534         }
535         return (hotk->status & ledmask) ? 1 : 0;
536 }
537
538 static int parse_arg(const char __user * buf, unsigned long count, int *val)
539 {
540         char s[32];
541         if (!count)
542                 return 0;
543         if (count > 31)
544                 return -EINVAL;
545         if (copy_from_user(s, buf, count))
546                 return -EFAULT;
547         s[count] = 0;
548         if (sscanf(s, "%i", val) != 1)
549                 return -EINVAL;
550         return count;
551 }
552
553 /* FIXME: kill extraneous args so it can be called independently */
554 static int
555 write_led(const char __user * buffer, unsigned long count,
556           char *ledname, int ledmask, int invert)
557 {
558         int value;
559         int led_out = 0;
560
561         count = parse_arg(buffer, count, &value);
562         if (count > 0)
563                 led_out = value ? 1 : 0;
564
565         hotk->status =
566             (led_out) ? (hotk->status | ledmask) : (hotk->status & ~ledmask);
567
568         if (invert)             /* invert target value */
569                 led_out = !led_out & 0x1;
570
571         if (!write_acpi_int(hotk->handle, ledname, led_out, NULL))
572                 printk(KERN_WARNING "Asus ACPI: LED (%s) write failed\n",
573                        ledname);
574
575         return count;
576 }
577
578 /*
579  * Proc handlers for MLED
580  */
581 static int
582 proc_read_mled(char *page, char **start, off_t off, int count, int *eof,
583                void *data)
584 {
585         return sprintf(page, "%d\n",
586                        read_led(hotk->methods->mled_status, MLED_ON));
587 }
588
589 static int
590 proc_write_mled(struct file *file, const char __user * buffer,
591                 unsigned long count, void *data)
592 {
593         return write_led(buffer, count, hotk->methods->mt_mled, MLED_ON, 1);
594 }
595
596 /*
597  * Proc handlers for LED display
598  */
599 static int
600 proc_read_ledd(char *page, char **start, off_t off, int count, int *eof,
601                void *data)
602 {
603         return sprintf(page, "0x%08x\n", hotk->ledd_status);
604 }
605
606 static int
607 proc_write_ledd(struct file *file, const char __user * buffer,
608                 unsigned long count, void *data)
609 {
610         int value;
611
612         count = parse_arg(buffer, count, &value);
613         if (count > 0) {
614                 if (!write_acpi_int
615                     (hotk->handle, hotk->methods->mt_ledd, value, NULL))
616                         printk(KERN_WARNING
617                                "Asus ACPI: LED display write failed\n");
618                 else
619                         hotk->ledd_status = (u32) value;
620         } else if (count < 0)
621                 printk(KERN_WARNING "Asus ACPI: Error reading user input\n");
622
623         return count;
624 }
625
626 /*
627  * Proc handlers for WLED
628  */
629 static int
630 proc_read_wled(char *page, char **start, off_t off, int count, int *eof,
631                void *data)
632 {
633         return sprintf(page, "%d\n",
634                        read_led(hotk->methods->wled_status, WLED_ON));
635 }
636
637 static int
638 proc_write_wled(struct file *file, const char __user * buffer,
639                 unsigned long count, void *data)
640 {
641         return write_led(buffer, count, hotk->methods->mt_wled, WLED_ON, 0);
642 }
643
644 /*
645  * Proc handlers for Bluetooth
646  */
647 static int
648 proc_read_bluetooth(char *page, char **start, off_t off, int count, int *eof,
649                     void *data)
650 {
651         return sprintf(page, "%d\n", read_led(hotk->methods->bt_status, BT_ON));
652 }
653
654 static int
655 proc_write_bluetooth(struct file *file, const char __user * buffer,
656                      unsigned long count, void *data)
657 {
658         /* Note: mt_bt_switch controls both internal Bluetooth adapter's 
659            presence and its LED */
660         return write_led(buffer, count, hotk->methods->mt_bt_switch, BT_ON, 0);
661 }
662
663 /*
664  * Proc handlers for TLED
665  */
666 static int
667 proc_read_tled(char *page, char **start, off_t off, int count, int *eof,
668                void *data)
669 {
670         return sprintf(page, "%d\n",
671                        read_led(hotk->methods->tled_status, TLED_ON));
672 }
673
674 static int
675 proc_write_tled(struct file *file, const char __user * buffer,
676                 unsigned long count, void *data)
677 {
678         return write_led(buffer, count, hotk->methods->mt_tled, TLED_ON, 0);
679 }
680
681 static int get_lcd_state(void)
682 {
683         int lcd = 0;
684
685         if (hotk->model != L3H) {
686                 /* We don't have to check anything if we are here */
687                 if (!read_acpi_int(NULL, hotk->methods->lcd_status, &lcd))
688                         printk(KERN_WARNING
689                                "Asus ACPI: Error reading LCD status\n");
690
691                 if (hotk->model == L2D)
692                         lcd = ~lcd;
693         } else {                /* L3H and the like have to be handled differently */
694                 acpi_status status = 0;
695                 struct acpi_object_list input;
696                 union acpi_object mt_params[2];
697                 struct acpi_buffer output;
698                 union acpi_object out_obj;
699
700                 input.count = 2;
701                 input.pointer = mt_params;
702                 /* Note: the following values are partly guessed up, but 
703                    otherwise they seem to work */
704                 mt_params[0].type = ACPI_TYPE_INTEGER;
705                 mt_params[0].integer.value = 0x02;
706                 mt_params[1].type = ACPI_TYPE_INTEGER;
707                 mt_params[1].integer.value = 0x02;
708
709                 output.length = sizeof(out_obj);
710                 output.pointer = &out_obj;
711
712                 status =
713                     acpi_evaluate_object(NULL, hotk->methods->lcd_status,
714                                          &input, &output);
715                 if (status != AE_OK)
716                         return -1;
717                 if (out_obj.type == ACPI_TYPE_INTEGER)
718                         /* That's what the AML code does */
719                         lcd = out_obj.integer.value >> 8;
720         }
721
722         return (lcd & 1);
723 }
724
725 static int set_lcd_state(int value)
726 {
727         int lcd = 0;
728         acpi_status status = 0;
729
730         lcd = value ? 1 : 0;
731         if (lcd != get_lcd_state()) {
732                 /* switch */
733                 if (hotk->model != L3H) {
734                         status =
735                             acpi_evaluate_object(NULL,
736                                                  hotk->methods->mt_lcd_switch,
737                                                  NULL, NULL);
738                 } else {        /* L3H and the like have to be handled differently */
739                         if (!write_acpi_int
740                             (hotk->handle, hotk->methods->mt_lcd_switch, 0x07,
741                              NULL))
742                                 status = AE_ERROR;
743                         /* L3H's AML executes EHK (0x07) upon Fn+F7 keypress, 
744                            the exact behaviour is simulated here */
745                 }
746                 if (ACPI_FAILURE(status))
747                         printk(KERN_WARNING "Asus ACPI: Error switching LCD\n");
748         }
749         return 0;
750
751 }
752
753 static int
754 proc_read_lcd(char *page, char **start, off_t off, int count, int *eof,
755               void *data)
756 {
757         return sprintf(page, "%d\n", get_lcd_state());
758 }
759
760 static int
761 proc_write_lcd(struct file *file, const char __user * buffer,
762                unsigned long count, void *data)
763 {
764         int value;
765
766         count = parse_arg(buffer, count, &value);
767         if (count > 0)
768                 set_lcd_state(value);
769         return count;
770 }
771
772 static int read_brightness(void)
773 {
774         int value;
775
776         if (hotk->methods->brightness_get) {    /* SPLV/GPLV laptop */
777                 if (!read_acpi_int(hotk->handle, hotk->methods->brightness_get,
778                                    &value))
779                         printk(KERN_WARNING
780                                "Asus ACPI: Error reading brightness\n");
781         } else if (hotk->methods->brightness_status) {  /* For D1 for example */
782                 if (!read_acpi_int(NULL, hotk->methods->brightness_status,
783                                    &value))
784                         printk(KERN_WARNING
785                                "Asus ACPI: Error reading brightness\n");
786         } else                  /* No GPLV method */
787                 value = hotk->brightness;
788         return value;
789 }
790
791 /*
792  * Change the brightness level
793  */
794 static void set_brightness(int value)
795 {
796         acpi_status status = 0;
797
798         /* SPLV laptop */
799         if (hotk->methods->brightness_set) {
800                 if (!write_acpi_int(hotk->handle, hotk->methods->brightness_set,
801                                     value, NULL))
802                         printk(KERN_WARNING
803                                "Asus ACPI: Error changing brightness\n");
804                 return;
805         }
806
807         /* No SPLV method if we are here, act as appropriate */
808         value -= read_brightness();
809         while (value != 0) {
810                 status = acpi_evaluate_object(NULL, (value > 0) ?
811                                               hotk->methods->brightness_up :
812                                               hotk->methods->brightness_down,
813                                               NULL, NULL);
814                 (value > 0) ? value-- : value++;
815                 if (ACPI_FAILURE(status))
816                         printk(KERN_WARNING
817                                "Asus ACPI: Error changing brightness\n");
818         }
819         return;
820 }
821
822 static int
823 proc_read_brn(char *page, char **start, off_t off, int count, int *eof,
824               void *data)
825 {
826         return sprintf(page, "%d\n", read_brightness());
827 }
828
829 static int
830 proc_write_brn(struct file *file, const char __user * buffer,
831                unsigned long count, void *data)
832 {
833         int value;
834
835         count = parse_arg(buffer, count, &value);
836         if (count > 0) {
837                 value = (0 < value) ? ((15 < value) ? 15 : value) : 0;
838                 /* 0 <= value <= 15 */
839                 set_brightness(value);
840         } else if (count < 0) {
841                 printk(KERN_WARNING "Asus ACPI: Error reading user input\n");
842         }
843
844         return count;
845 }
846
847 static void set_display(int value)
848 {
849         /* no sanity check needed for now */
850         if (!write_acpi_int(hotk->handle, hotk->methods->display_set,
851                             value, NULL))
852                 printk(KERN_WARNING "Asus ACPI: Error setting display\n");
853         return;
854 }
855
856 /*
857  * Now, *this* one could be more user-friendly, but so far, no-one has 
858  * complained. The significance of bits is the same as in proc_write_disp()
859  */
860 static int
861 proc_read_disp(char *page, char **start, off_t off, int count, int *eof,
862                void *data)
863 {
864         int value = 0;
865
866         if (!read_acpi_int(hotk->handle, hotk->methods->display_get, &value))
867                 printk(KERN_WARNING
868                        "Asus ACPI: Error reading display status\n");
869         value &= 0x07;          /* needed for some models, shouldn't hurt others */
870         return sprintf(page, "%d\n", value);
871 }
872
873 /*
874  * Experimental support for display switching. As of now: 1 should activate 
875  * the LCD output, 2 should do for CRT, and 4 for TV-Out. Any combination 
876  * (bitwise) of these will suffice. I never actually tested 3 displays hooked up 
877  * simultaneously, so be warned. See the acpi4asus README for more info.
878  */
879 static int
880 proc_write_disp(struct file *file, const char __user * buffer,
881                 unsigned long count, void *data)
882 {
883         int value;
884
885         count = parse_arg(buffer, count, &value);
886         if (count > 0)
887                 set_display(value);
888         else if (count < 0)
889                 printk(KERN_WARNING "Asus ACPI: Error reading user input\n");
890
891         return count;
892 }
893
894 typedef int (proc_readfunc) (char *page, char **start, off_t off, int count,
895                              int *eof, void *data);
896 typedef int (proc_writefunc) (struct file * file, const char __user * buffer,
897                               unsigned long count, void *data);
898
899 static int
900 asus_proc_add(char *name, proc_writefunc * writefunc,
901                      proc_readfunc * readfunc, mode_t mode,
902                      struct acpi_device *device)
903 {
904         struct proc_dir_entry *proc =
905             create_proc_entry(name, mode, acpi_device_dir(device));
906         if (!proc) {
907                 printk(KERN_WARNING "  Unable to create %s fs entry\n", name);
908                 return -1;
909         }
910         proc->write_proc = writefunc;
911         proc->read_proc = readfunc;
912         proc->data = acpi_driver_data(device);
913         proc->owner = THIS_MODULE;
914         proc->uid = asus_uid;
915         proc->gid = asus_gid;
916         return 0;
917 }
918
919 static int asus_hotk_add_fs(struct acpi_device *device)
920 {
921         struct proc_dir_entry *proc;
922         mode_t mode;
923
924         /*
925          * If parameter uid or gid is not changed, keep the default setting for
926          * our proc entries (-rw-rw-rw-) else, it means we care about security,
927          * and then set to -rw-rw----
928          */
929
930         if ((asus_uid == 0) && (asus_gid == 0)) {
931                 mode = S_IFREG | S_IRUGO | S_IWUGO;
932         } else {
933                 mode = S_IFREG | S_IRUSR | S_IRGRP | S_IWUSR | S_IWGRP;
934                 printk(KERN_WARNING "  asus_uid and asus_gid parameters are "
935                        "deprecated, use chown and chmod instead!\n");
936         }
937
938         acpi_device_dir(device) = asus_proc_dir;
939         if (!acpi_device_dir(device))
940                 return -ENODEV;
941
942         proc = create_proc_entry(PROC_INFO, mode, acpi_device_dir(device));
943         if (proc) {
944                 proc->read_proc = proc_read_info;
945                 proc->data = acpi_driver_data(device);
946                 proc->owner = THIS_MODULE;
947                 proc->uid = asus_uid;
948                 proc->gid = asus_gid;
949         } else {
950                 printk(KERN_WARNING "  Unable to create " PROC_INFO
951                        " fs entry\n");
952         }
953
954         if (hotk->methods->mt_wled) {
955                 asus_proc_add(PROC_WLED, &proc_write_wled, &proc_read_wled,
956                               mode, device);
957         }
958
959         if (hotk->methods->mt_ledd) {
960                 asus_proc_add(PROC_LEDD, &proc_write_ledd, &proc_read_ledd,
961                               mode, device);
962         }
963
964         if (hotk->methods->mt_mled) {
965                 asus_proc_add(PROC_MLED, &proc_write_mled, &proc_read_mled,
966                               mode, device);
967         }
968
969         if (hotk->methods->mt_tled) {
970                 asus_proc_add(PROC_TLED, &proc_write_tled, &proc_read_tled,
971                               mode, device);
972         }
973
974         if (hotk->methods->mt_bt_switch) {
975                 asus_proc_add(PROC_BT, &proc_write_bluetooth,
976                               &proc_read_bluetooth, mode, device);
977         }
978
979         /* 
980          * We need both read node and write method as LCD switch is also accessible
981          * from keyboard 
982          */
983         if (hotk->methods->mt_lcd_switch && hotk->methods->lcd_status) {
984                 asus_proc_add(PROC_LCD, &proc_write_lcd, &proc_read_lcd, mode,
985                               device);
986         }
987
988         if ((hotk->methods->brightness_up && hotk->methods->brightness_down) ||
989             (hotk->methods->brightness_get && hotk->methods->brightness_set)) {
990                 asus_proc_add(PROC_BRN, &proc_write_brn, &proc_read_brn, mode,
991                               device);
992         }
993
994         if (hotk->methods->display_set) {
995                 asus_proc_add(PROC_DISP, &proc_write_disp, &proc_read_disp,
996                               mode, device);
997         }
998
999         return 0;
1000 }
1001
1002 static int asus_hotk_remove_fs(struct acpi_device *device)
1003 {
1004         if (acpi_device_dir(device)) {
1005                 remove_proc_entry(PROC_INFO, acpi_device_dir(device));
1006                 if (hotk->methods->mt_wled)
1007                         remove_proc_entry(PROC_WLED, acpi_device_dir(device));
1008                 if (hotk->methods->mt_mled)
1009                         remove_proc_entry(PROC_MLED, acpi_device_dir(device));
1010                 if (hotk->methods->mt_tled)
1011                         remove_proc_entry(PROC_TLED, acpi_device_dir(device));
1012                 if (hotk->methods->mt_ledd)
1013                         remove_proc_entry(PROC_LEDD, acpi_device_dir(device));
1014                 if (hotk->methods->mt_bt_switch)
1015                         remove_proc_entry(PROC_BT, acpi_device_dir(device));
1016                 if (hotk->methods->mt_lcd_switch && hotk->methods->lcd_status)
1017                         remove_proc_entry(PROC_LCD, acpi_device_dir(device));
1018                 if ((hotk->methods->brightness_up
1019                      && hotk->methods->brightness_down)
1020                     || (hotk->methods->brightness_get
1021                         && hotk->methods->brightness_set))
1022                         remove_proc_entry(PROC_BRN, acpi_device_dir(device));
1023                 if (hotk->methods->display_set)
1024                         remove_proc_entry(PROC_DISP, acpi_device_dir(device));
1025         }
1026         return 0;
1027 }
1028
1029 static void asus_hotk_notify(acpi_handle handle, u32 event, void *data)
1030 {
1031         /* TODO Find a better way to handle events count. */
1032         if (!hotk)
1033                 return;
1034
1035         if ((event & ~((u32) BR_UP)) < 16) {
1036                 hotk->brightness = (event & ~((u32) BR_UP));
1037         } else if ((event & ~((u32) BR_DOWN)) < 16) {
1038                 hotk->brightness = (event & ~((u32) BR_DOWN));
1039         }
1040
1041         acpi_bus_generate_event(hotk->device, event,
1042                                 hotk->event_count[event % 128]++);
1043
1044         return;
1045 }
1046
1047 /*
1048  * Match the model string to the list of supported models. Return END_MODEL if
1049  * no match or model is NULL.
1050  */
1051 static int asus_model_match(char *model)
1052 {
1053         if (model == NULL)
1054                 return END_MODEL;
1055
1056         if (strncmp(model, "L3D", 3) == 0)
1057                 return L3D;
1058         else if (strncmp(model, "L2E", 3) == 0 ||
1059                  strncmp(model, "L3H", 3) == 0 || strncmp(model, "L5D", 3) == 0)
1060                 return L3H;
1061         else if (strncmp(model, "L3", 2) == 0 || strncmp(model, "L2B", 3) == 0)
1062                 return L3C;
1063         else if (strncmp(model, "L8L", 3) == 0)
1064                 return L8L;
1065         else if (strncmp(model, "L4R", 3) == 0)
1066                 return L4R;
1067         else if (strncmp(model, "M6N", 3) == 0 || strncmp(model, "W3N", 3) == 0)
1068                 return M6N;
1069         else if (strncmp(model, "M6R", 3) == 0 || strncmp(model, "A3G", 3) == 0)
1070                 return M6R;
1071         else if (strncmp(model, "M2N", 3) == 0 ||
1072                  strncmp(model, "M3N", 3) == 0 ||
1073                  strncmp(model, "M5N", 3) == 0 ||
1074                  strncmp(model, "M6N", 3) == 0 ||
1075                  strncmp(model, "S1N", 3) == 0 ||
1076                  strncmp(model, "S5N", 3) == 0 || strncmp(model, "W1N", 3) == 0)
1077                 return xxN;
1078         else if (strncmp(model, "M1", 2) == 0)
1079                 return M1A;
1080         else if (strncmp(model, "M2", 2) == 0 || strncmp(model, "L4E", 3) == 0)
1081                 return M2E;
1082         else if (strncmp(model, "L2", 2) == 0)
1083                 return L2D;
1084         else if (strncmp(model, "L8", 2) == 0)
1085                 return S1x;
1086         else if (strncmp(model, "D1", 2) == 0)
1087                 return D1x;
1088         else if (strncmp(model, "A1", 2) == 0)
1089                 return A1x;
1090         else if (strncmp(model, "A2", 2) == 0)
1091                 return A2x;
1092         else if (strncmp(model, "J1", 2) == 0)
1093                 return S2x;
1094         else if (strncmp(model, "L5", 2) == 0)
1095                 return L5x;
1096         else if (strncmp(model, "A4G", 3) == 0)
1097                 return A4G;
1098         else if (strncmp(model, "W1N", 3) == 0)
1099                 return W1N;
1100         else if (strncmp(model, "W5A", 3) == 0)
1101                 return W5A;
1102         else
1103                 return END_MODEL;
1104 }
1105
1106 /*
1107  * This function is used to initialize the hotk with right values. In this
1108  * method, we can make all the detection we want, and modify the hotk struct
1109  */
1110 static int asus_hotk_get_info(void)
1111 {
1112         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1113         struct acpi_buffer dsdt = { ACPI_ALLOCATE_BUFFER, NULL };
1114         union acpi_object *model = NULL;
1115         int bsts_result;
1116         char *string = NULL;
1117         acpi_status status;
1118
1119         /*
1120          * Get DSDT headers early enough to allow for differentiating between 
1121          * models, but late enough to allow acpi_bus_register_driver() to fail 
1122          * before doing anything ACPI-specific. Should we encounter a machine,
1123          * which needs special handling (i.e. its hotkey device has a different
1124          * HID), this bit will be moved. A global variable asus_info contains
1125          * the DSDT header.
1126          */
1127         status = acpi_get_table(ACPI_TABLE_ID_DSDT, 1, &dsdt);
1128         if (ACPI_FAILURE(status))
1129                 printk(KERN_WARNING "  Couldn't get the DSDT table header\n");
1130         else
1131                 asus_info = dsdt.pointer;
1132
1133         /* We have to write 0 on init this far for all ASUS models */
1134         if (!write_acpi_int(hotk->handle, "INIT", 0, &buffer)) {
1135                 printk(KERN_ERR "  Hotkey initialization failed\n");
1136                 return -ENODEV;
1137         }
1138
1139         /* This needs to be called for some laptops to init properly */
1140         if (!read_acpi_int(hotk->handle, "BSTS", &bsts_result))
1141                 printk(KERN_WARNING "  Error calling BSTS\n");
1142         else if (bsts_result)
1143                 printk(KERN_NOTICE "  BSTS called, 0x%02x returned\n",
1144                        bsts_result);
1145
1146         /*
1147          * Try to match the object returned by INIT to the specific model.
1148          * Handle every possible object (or the lack of thereof) the DSDT 
1149          * writers might throw at us. When in trouble, we pass NULL to 
1150          * asus_model_match() and try something completely different.
1151          */
1152         if (buffer.pointer) {
1153                 model = buffer.pointer;
1154                 switch (model->type) {
1155                 case ACPI_TYPE_STRING:
1156                         string = model->string.pointer;
1157                         break;
1158                 case ACPI_TYPE_BUFFER:
1159                         string = model->buffer.pointer;
1160                         break;
1161                 default:
1162                         kfree(model);
1163                         break;
1164                 }
1165         }
1166         hotk->model = asus_model_match(string);
1167         if (hotk->model == END_MODEL) { /* match failed */
1168                 if (asus_info &&
1169                     strncmp(asus_info->oem_table_id, "ODEM", 4) == 0) {
1170                         hotk->model = P30;
1171                         printk(KERN_NOTICE
1172                                "  Samsung P30 detected, supported\n");
1173                 } else {
1174                         hotk->model = M2E;
1175                         printk(KERN_NOTICE "  unsupported model %s, trying "
1176                                "default values\n", string);
1177                         printk(KERN_NOTICE
1178                                "  send /proc/acpi/dsdt to the developers\n");
1179                 }
1180                 hotk->methods = &model_conf[hotk->model];
1181                 return AE_OK;
1182         }
1183         hotk->methods = &model_conf[hotk->model];
1184         printk(KERN_NOTICE "  %s model detected, supported\n", string);
1185
1186         /* Sort of per-model blacklist */
1187         if (strncmp(string, "L2B", 3) == 0)
1188                 hotk->methods->lcd_status = NULL;
1189         /* L2B is similar enough to L3C to use its settings, with this only 
1190            exception */
1191         else if (strncmp(string, "A3G", 3) == 0)
1192                 hotk->methods->lcd_status = "\\BLFG";
1193         /* A3G is like M6R */
1194         else if (strncmp(string, "S5N", 3) == 0 ||
1195                  strncmp(string, "M5N", 3) == 0 ||
1196                  strncmp(string, "W3N", 3) == 0)
1197                 hotk->methods->mt_mled = NULL;
1198         /* S5N, M5N and W3N have no MLED */
1199         else if (strncmp(string, "L5D", 3) == 0)
1200                 hotk->methods->mt_wled = NULL;
1201         /* L5D's WLED is not controlled by ACPI */
1202         else if (strncmp(string, "M2N", 3) == 0 ||
1203                  strncmp(string, "S1N", 3) == 0)
1204                 hotk->methods->mt_wled = "WLED";
1205         /* M2N and S1N have a usable WLED */
1206         else if (asus_info) {
1207                 if (strncmp(asus_info->oem_table_id, "L1", 2) == 0)
1208                         hotk->methods->mled_status = NULL;
1209                 /* S1300A reports L84F, but L1400B too, account for that */
1210         }
1211
1212         kfree(model);
1213
1214         return AE_OK;
1215 }
1216
1217 static int asus_hotk_check(void)
1218 {
1219         int result = 0;
1220
1221         result = acpi_bus_get_status(hotk->device);
1222         if (result)
1223                 return result;
1224
1225         if (hotk->device->status.present) {
1226                 result = asus_hotk_get_info();
1227         } else {
1228                 printk(KERN_ERR "  Hotkey device not present, aborting\n");
1229                 return -EINVAL;
1230         }
1231
1232         return result;
1233 }
1234
1235 static int asus_hotk_found;
1236
1237 static int asus_hotk_add(struct acpi_device *device)
1238 {
1239         acpi_status status = AE_OK;
1240         int result;
1241
1242         if (!device)
1243                 return -EINVAL;
1244
1245         printk(KERN_NOTICE "Asus Laptop ACPI Extras version %s\n",
1246                ASUS_ACPI_VERSION);
1247
1248         hotk = kmalloc(sizeof(struct asus_hotk), GFP_KERNEL);
1249         if (!hotk)
1250                 return -ENOMEM;
1251         memset(hotk, 0, sizeof(struct asus_hotk));
1252
1253         hotk->handle = device->handle;
1254         strcpy(acpi_device_name(device), ACPI_HOTK_DEVICE_NAME);
1255         strcpy(acpi_device_class(device), ACPI_HOTK_CLASS);
1256         acpi_driver_data(device) = hotk;
1257         hotk->device = device;
1258
1259         result = asus_hotk_check();
1260         if (result)
1261                 goto end;
1262
1263         result = asus_hotk_add_fs(device);
1264         if (result)
1265                 goto end;
1266
1267         /*
1268          * We install the handler, it will receive the hotk in parameter, so, we
1269          * could add other data to the hotk struct
1270          */
1271         status = acpi_install_notify_handler(hotk->handle, ACPI_SYSTEM_NOTIFY,
1272                                              asus_hotk_notify, hotk);
1273         if (ACPI_FAILURE(status))
1274                 printk(KERN_ERR "  Error installing notify handler\n");
1275
1276         /* For laptops without GPLV: init the hotk->brightness value */
1277         if ((!hotk->methods->brightness_get)
1278             && (!hotk->methods->brightness_status)
1279             && (hotk->methods->brightness_up && hotk->methods->brightness_down)) {
1280                 status =
1281                     acpi_evaluate_object(NULL, hotk->methods->brightness_down,
1282                                          NULL, NULL);
1283                 if (ACPI_FAILURE(status))
1284                         printk(KERN_WARNING "  Error changing brightness\n");
1285                 else {
1286                         status =
1287                             acpi_evaluate_object(NULL,
1288                                                  hotk->methods->brightness_up,
1289                                                  NULL, NULL);
1290                         if (ACPI_FAILURE(status))
1291                                 printk(KERN_WARNING "  Strange, error changing"
1292                                        " brightness\n");
1293                 }
1294         }
1295
1296         asus_hotk_found = 1;
1297
1298         /* LED display is off by default */
1299         hotk->ledd_status = 0xFFF;
1300
1301       end:
1302         if (result) {
1303                 kfree(hotk);
1304         }
1305
1306         return result;
1307 }
1308
1309 static int asus_hotk_remove(struct acpi_device *device, int type)
1310 {
1311         acpi_status status = 0;
1312
1313         if (!device || !acpi_driver_data(device))
1314                 return -EINVAL;
1315
1316         status = acpi_remove_notify_handler(hotk->handle, ACPI_SYSTEM_NOTIFY,
1317                                             asus_hotk_notify);
1318         if (ACPI_FAILURE(status))
1319                 printk(KERN_ERR "Asus ACPI: Error removing notify handler\n");
1320
1321         asus_hotk_remove_fs(device);
1322
1323         kfree(hotk);
1324
1325         return 0;
1326 }
1327
1328 static int __init asus_acpi_init(void)
1329 {
1330         int result;
1331
1332         if (acpi_disabled)
1333                 return -ENODEV;
1334
1335         if (!acpi_specific_hotkey_enabled) {
1336                 printk(KERN_ERR "Using generic hotkey driver\n");
1337                 return -ENODEV;
1338         }
1339         asus_proc_dir = proc_mkdir(PROC_ASUS, acpi_root_dir);
1340         if (!asus_proc_dir) {
1341                 printk(KERN_ERR "Asus ACPI: Unable to create /proc entry\n");
1342                 return -ENODEV;
1343         }
1344         asus_proc_dir->owner = THIS_MODULE;
1345
1346         result = acpi_bus_register_driver(&asus_hotk_driver);
1347         if (result < 0) {
1348                 remove_proc_entry(PROC_ASUS, acpi_root_dir);
1349                 return result;
1350         }
1351
1352         /*
1353          * This is a bit of a kludge.  We only want this module loaded
1354          * for ASUS systems, but there's currently no way to probe the
1355          * ACPI namespace for ASUS HIDs.  So we just return failure if
1356          * we didn't find one, which will cause the module to be
1357          * unloaded.
1358          */
1359         if (!asus_hotk_found) {
1360                 acpi_bus_unregister_driver(&asus_hotk_driver);
1361                 remove_proc_entry(PROC_ASUS, acpi_root_dir);
1362                 return result;
1363         }
1364
1365         return 0;
1366 }
1367
1368 static void __exit asus_acpi_exit(void)
1369 {
1370         acpi_bus_unregister_driver(&asus_hotk_driver);
1371         remove_proc_entry(PROC_ASUS, acpi_root_dir);
1372
1373         kfree(asus_info);
1374
1375         return;
1376 }
1377
1378 module_init(asus_acpi_init);
1379 module_exit(asus_acpi_exit);