ACPI: replace kmalloc+memset with kzalloc
[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 <linux/backlight.h>
39 #include <acpi/acpi_drivers.h>
40 #include <acpi/acpi_bus.h>
41 #include <asm/uaccess.h>
42
43 #define ASUS_ACPI_VERSION "0.30"
44
45 #define PROC_ASUS       "asus"  //the directory
46 #define PROC_MLED       "mled"
47 #define PROC_WLED       "wled"
48 #define PROC_TLED       "tled"
49 #define PROC_BT         "bluetooth"
50 #define PROC_LEDD       "ledd"
51 #define PROC_INFO       "info"
52 #define PROC_LCD        "lcd"
53 #define PROC_BRN        "brn"
54 #define PROC_DISP       "disp"
55
56 #define ACPI_HOTK_NAME          "Asus Laptop ACPI Extras Driver"
57 #define ACPI_HOTK_CLASS         "hotkey"
58 #define ACPI_HOTK_DEVICE_NAME   "Hotkey"
59 #define ACPI_HOTK_HID           "ATK0100"
60
61 /*
62  * Some events we use, same for all Asus
63  */
64 #define BR_UP       0x10
65 #define BR_DOWN     0x20
66
67 /*
68  * Flags for hotk status
69  */
70 #define MLED_ON     0x01        //mail LED
71 #define WLED_ON     0x02        //wireless LED
72 #define TLED_ON     0x04        //touchpad LED
73 #define BT_ON       0x08        //internal Bluetooth
74
75 MODULE_AUTHOR("Julien Lerouge, Karol Kozimor");
76 MODULE_DESCRIPTION(ACPI_HOTK_NAME);
77 MODULE_LICENSE("GPL");
78
79 static uid_t asus_uid;
80 static gid_t asus_gid;
81 module_param(asus_uid, uint, 0);
82 MODULE_PARM_DESC(asus_uid, "UID for entries in /proc/acpi/asus.\n");
83 module_param(asus_gid, uint, 0);
84 MODULE_PARM_DESC(asus_gid, "GID for entries in /proc/acpi/asus.\n");
85
86 /* For each model, all features implemented, 
87  * those marked with R are relative to HOTK, A for absolute */
88 struct model_data {
89         char *name;             //name of the laptop________________A
90         char *mt_mled;          //method to handle mled_____________R
91         char *mled_status;      //node to handle mled reading_______A
92         char *mt_wled;          //method to handle wled_____________R
93         char *wled_status;      //node to handle wled reading_______A
94         char *mt_tled;          //method to handle tled_____________R
95         char *tled_status;      //node to handle tled reading_______A
96         char *mt_ledd;          //method to handle LED display______R
97         char *mt_bt_switch;     //method to switch Bluetooth on/off_R
98         char *bt_status;        //no model currently supports this__?
99         char *mt_lcd_switch;    //method to turn LCD on/off_________A
100         char *lcd_status;       //node to read LCD panel state______A
101         char *brightness_up;    //method to set brightness up_______A
102         char *brightness_down;  //guess what ?______________________A
103         char *brightness_set;   //method to set absolute brightness_R
104         char *brightness_get;   //method to get absolute brightness_R
105         char *brightness_status;        //node to get brightness____________A
106         char *display_set;      //method to set video output________R
107         char *display_get;      //method to get video output________R
108 };
109
110 /*
111  * This is the main structure, we can use it to store anything interesting
112  * about the hotk device
113  */
114 struct asus_hotk {
115         struct acpi_device *device;     //the device we are in
116         acpi_handle handle;     //the handle of the hotk device
117         char status;            //status of the hotk, for LEDs, ...
118         u32 ledd_status;        //status of the LED display
119         struct model_data *methods;     //methods available on the laptop
120         u8 brightness;          //brightness level
121         enum {
122                 A1x = 0,        //A1340D, A1300F
123                 A2x,            //A2500H
124                 A4G,            //A4700G
125                 D1x,            //D1
126                 L2D,            //L2000D
127                 L3C,            //L3800C
128                 L3D,            //L3400D
129                 L3H,            //L3H, L2000E, L5D
130                 L4R,            //L4500R
131                 L5x,            //L5800C 
132                 L8L,            //L8400L
133                 M1A,            //M1300A
134                 M2E,            //M2400E, L4400L
135                 M6N,            //M6800N, W3400N
136                 M6R,            //M6700R, A3000G
137                 P30,            //Samsung P30
138                 S1x,            //S1300A, but also L1400B and M2400A (L84F)
139                 S2x,            //S200 (J1 reported), Victor MP-XP7210
140                 W1N,            //W1000N
141                 W5A,            //W5A
142                 W3V,            //W3030V
143                 xxN,            //M2400N, M3700N, M5200N, M6800N, S1300N, S5200N
144                 //(Centrino)
145                 END_MODEL
146         } model;                //Models currently supported
147         u16 event_count[128];   //count for each event TODO make this better
148 };
149
150 /* Here we go */
151 #define A1x_PREFIX "\\_SB.PCI0.ISA.EC0."
152 #define L3C_PREFIX "\\_SB.PCI0.PX40.ECD0."
153 #define M1A_PREFIX "\\_SB.PCI0.PX40.EC0."
154 #define P30_PREFIX "\\_SB.PCI0.LPCB.EC0."
155 #define S1x_PREFIX "\\_SB.PCI0.PX40."
156 #define S2x_PREFIX A1x_PREFIX
157 #define xxN_PREFIX "\\_SB.PCI0.SBRG.EC0."
158
159 static struct model_data model_conf[END_MODEL] = {
160         /*
161          * TODO I have seen a SWBX and AIBX method on some models, like L1400B,
162          * it seems to be a kind of switch, but what for ?
163          */
164
165         {
166          .name = "A1x",
167          .mt_mled = "MLED",
168          .mled_status = "\\MAIL",
169          .mt_lcd_switch = A1x_PREFIX "_Q10",
170          .lcd_status = "\\BKLI",
171          .brightness_up = A1x_PREFIX "_Q0E",
172          .brightness_down = A1x_PREFIX "_Q0F"},
173
174         {
175          .name = "A2x",
176          .mt_mled = "MLED",
177          .mt_wled = "WLED",
178          .wled_status = "\\SG66",
179          .mt_lcd_switch = "\\Q10",
180          .lcd_status = "\\BAOF",
181          .brightness_set = "SPLV",
182          .brightness_get = "GPLV",
183          .display_set = "SDSP",
184          .display_get = "\\INFB"},
185
186         {
187          .name = "A4G",
188          .mt_mled = "MLED",
189 /* WLED present, but not controlled by ACPI */
190          .mt_lcd_switch = xxN_PREFIX "_Q10",
191          .brightness_set = "SPLV",
192          .brightness_get = "GPLV",
193          .display_set = "SDSP",
194          .display_get = "\\ADVG"},
195
196         {
197          .name = "D1x",
198          .mt_mled = "MLED",
199          .mt_lcd_switch = "\\Q0D",
200          .lcd_status = "\\GP11",
201          .brightness_up = "\\Q0C",
202          .brightness_down = "\\Q0B",
203          .brightness_status = "\\BLVL",
204          .display_set = "SDSP",
205          .display_get = "\\INFB"},
206
207         {
208          .name = "L2D",
209          .mt_mled = "MLED",
210          .mled_status = "\\SGP6",
211          .mt_wled = "WLED",
212          .wled_status = "\\RCP3",
213          .mt_lcd_switch = "\\Q10",
214          .lcd_status = "\\SGP0",
215          .brightness_up = "\\Q0E",
216          .brightness_down = "\\Q0F",
217          .display_set = "SDSP",
218          .display_get = "\\INFB"},
219
220         {
221          .name = "L3C",
222          .mt_mled = "MLED",
223          .mt_wled = "WLED",
224          .mt_lcd_switch = L3C_PREFIX "_Q10",
225          .lcd_status = "\\GL32",
226          .brightness_set = "SPLV",
227          .brightness_get = "GPLV",
228          .display_set = "SDSP",
229          .display_get = "\\_SB.PCI0.PCI1.VGAC.NMAP"},
230
231         {
232          .name = "L3D",
233          .mt_mled = "MLED",
234          .mled_status = "\\MALD",
235          .mt_wled = "WLED",
236          .mt_lcd_switch = "\\Q10",
237          .lcd_status = "\\BKLG",
238          .brightness_set = "SPLV",
239          .brightness_get = "GPLV",
240          .display_set = "SDSP",
241          .display_get = "\\INFB"},
242
243         {
244          .name = "L3H",
245          .mt_mled = "MLED",
246          .mt_wled = "WLED",
247          .mt_lcd_switch = "EHK",
248          .lcd_status = "\\_SB.PCI0.PM.PBC",
249          .brightness_set = "SPLV",
250          .brightness_get = "GPLV",
251          .display_set = "SDSP",
252          .display_get = "\\INFB"},
253
254         {
255          .name = "L4R",
256          .mt_mled = "MLED",
257          .mt_wled = "WLED",
258          .wled_status = "\\_SB.PCI0.SBRG.SG13",
259          .mt_lcd_switch = xxN_PREFIX "_Q10",
260          .lcd_status = "\\_SB.PCI0.SBSM.SEO4",
261          .brightness_set = "SPLV",
262          .brightness_get = "GPLV",
263          .display_set = "SDSP",
264          .display_get = "\\_SB.PCI0.P0P1.VGA.GETD"},
265
266         {
267          .name = "L5x",
268          .mt_mled = "MLED",
269 /* WLED present, but not controlled by ACPI */
270          .mt_tled = "TLED",
271          .mt_lcd_switch = "\\Q0D",
272          .lcd_status = "\\BAOF",
273          .brightness_set = "SPLV",
274          .brightness_get = "GPLV",
275          .display_set = "SDSP",
276          .display_get = "\\INFB"},
277
278         {
279          .name = "L8L"
280 /* No features, but at least support the hotkeys */
281          },
282
283         {
284          .name = "M1A",
285          .mt_mled = "MLED",
286          .mt_lcd_switch = M1A_PREFIX "Q10",
287          .lcd_status = "\\PNOF",
288          .brightness_up = M1A_PREFIX "Q0E",
289          .brightness_down = M1A_PREFIX "Q0F",
290          .brightness_status = "\\BRIT",
291          .display_set = "SDSP",
292          .display_get = "\\INFB"},
293
294         {
295          .name = "M2E",
296          .mt_mled = "MLED",
297          .mt_wled = "WLED",
298          .mt_lcd_switch = "\\Q10",
299          .lcd_status = "\\GP06",
300          .brightness_set = "SPLV",
301          .brightness_get = "GPLV",
302          .display_set = "SDSP",
303          .display_get = "\\INFB"},
304
305         {
306          .name = "M6N",
307          .mt_mled = "MLED",
308          .mt_wled = "WLED",
309          .wled_status = "\\_SB.PCI0.SBRG.SG13",
310          .mt_lcd_switch = xxN_PREFIX "_Q10",
311          .lcd_status = "\\_SB.BKLT",
312          .brightness_set = "SPLV",
313          .brightness_get = "GPLV",
314          .display_set = "SDSP",
315          .display_get = "\\SSTE"},
316
317         {
318          .name = "M6R",
319          .mt_mled = "MLED",
320          .mt_wled = "WLED",
321          .mt_lcd_switch = xxN_PREFIX "_Q10",
322          .lcd_status = "\\_SB.PCI0.SBSM.SEO4",
323          .brightness_set = "SPLV",
324          .brightness_get = "GPLV",
325          .display_set = "SDSP",
326          .display_get = "\\_SB.PCI0.P0P1.VGA.GETD"},
327
328         {
329          .name = "P30",
330          .mt_wled = "WLED",
331          .mt_lcd_switch = P30_PREFIX "_Q0E",
332          .lcd_status = "\\BKLT",
333          .brightness_up = P30_PREFIX "_Q68",
334          .brightness_down = P30_PREFIX "_Q69",
335          .brightness_get = "GPLV",
336          .display_set = "SDSP",
337          .display_get = "\\DNXT"},
338
339         {
340          .name = "S1x",
341          .mt_mled = "MLED",
342          .mled_status = "\\EMLE",
343          .mt_wled = "WLED",
344          .mt_lcd_switch = S1x_PREFIX "Q10",
345          .lcd_status = "\\PNOF",
346          .brightness_set = "SPLV",
347          .brightness_get = "GPLV"},
348
349         {
350          .name = "S2x",
351          .mt_mled = "MLED",
352          .mled_status = "\\MAIL",
353          .mt_lcd_switch = S2x_PREFIX "_Q10",
354          .lcd_status = "\\BKLI",
355          .brightness_up = S2x_PREFIX "_Q0B",
356          .brightness_down = S2x_PREFIX "_Q0A"},
357
358         {
359          .name = "W1N",
360          .mt_mled = "MLED",
361          .mt_wled = "WLED",
362          .mt_ledd = "SLCM",
363          .mt_lcd_switch = xxN_PREFIX "_Q10",
364          .lcd_status = "\\BKLT",
365          .brightness_set = "SPLV",
366          .brightness_get = "GPLV",
367          .display_set = "SDSP",
368          .display_get = "\\ADVG"},
369
370         {
371          .name = "W5A",
372          .mt_bt_switch = "BLED",
373          .mt_wled = "WLED",
374          .mt_lcd_switch = xxN_PREFIX "_Q10",
375          .brightness_set = "SPLV",
376          .brightness_get = "GPLV",
377          .display_set = "SDSP",
378          .display_get = "\\ADVG"},
379
380         {
381          .name = "W3V",
382          .mt_mled = "MLED",
383          .mt_wled = "WLED",
384          .mt_lcd_switch = xxN_PREFIX "_Q10",
385          .lcd_status = "\\BKLT",
386          .brightness_set = "SPLV",
387          .brightness_get = "GPLV",
388          .display_set = "SDSP",
389          .display_get = "\\INFB"},
390
391        {
392          .name = "xxN",
393          .mt_mled = "MLED",
394 /* WLED present, but not controlled by ACPI */
395          .mt_lcd_switch = xxN_PREFIX "_Q10",
396          .lcd_status = "\\BKLT",
397          .brightness_set = "SPLV",
398          .brightness_get = "GPLV",
399          .display_set = "SDSP",
400          .display_get = "\\ADVG"}
401 };
402
403 /* procdir we use */
404 static struct proc_dir_entry *asus_proc_dir;
405
406 static struct backlight_device *asus_backlight_device;
407
408 /*
409  * This header is made available to allow proper configuration given model,
410  * revision number , ... this info cannot go in struct asus_hotk because it is
411  * available before the hotk
412  */
413 static struct acpi_table_header *asus_info;
414
415 /* The actual device the driver binds to */
416 static struct asus_hotk *hotk;
417
418 /*
419  * The hotkey driver declaration
420  */
421 static int asus_hotk_add(struct acpi_device *device);
422 static int asus_hotk_remove(struct acpi_device *device, int type);
423 static struct acpi_driver asus_hotk_driver = {
424         .name = ACPI_HOTK_NAME,
425         .class = ACPI_HOTK_CLASS,
426         .ids = ACPI_HOTK_HID,
427         .ops = {
428                 .add = asus_hotk_add,
429                 .remove = asus_hotk_remove,
430                 },
431 };
432
433 /* 
434  * This function evaluates an ACPI method, given an int as parameter, the
435  * method is searched within the scope of the handle, can be NULL. The output
436  * of the method is written is output, which can also be NULL
437  *
438  * returns 1 if write is successful, 0 else. 
439  */
440 static int write_acpi_int(acpi_handle handle, const char *method, int val,
441                           struct acpi_buffer *output)
442 {
443         struct acpi_object_list params; //list of input parameters (an int here)
444         union acpi_object in_obj;       //the only param we use
445         acpi_status status;
446
447         params.count = 1;
448         params.pointer = &in_obj;
449         in_obj.type = ACPI_TYPE_INTEGER;
450         in_obj.integer.value = val;
451
452         status = acpi_evaluate_object(handle, (char *)method, &params, output);
453         return (status == AE_OK);
454 }
455
456 static int read_acpi_int(acpi_handle handle, const char *method, int *val)
457 {
458         struct acpi_buffer output;
459         union acpi_object out_obj;
460         acpi_status status;
461
462         output.length = sizeof(out_obj);
463         output.pointer = &out_obj;
464
465         status = acpi_evaluate_object(handle, (char *)method, NULL, &output);
466         *val = out_obj.integer.value;
467         return (status == AE_OK) && (out_obj.type == ACPI_TYPE_INTEGER);
468 }
469
470 /*
471  * We write our info in page, we begin at offset off and cannot write more
472  * than count bytes. We set eof to 1 if we handle those 2 values. We return the
473  * number of bytes written in page
474  */
475 static int
476 proc_read_info(char *page, char **start, off_t off, int count, int *eof,
477                void *data)
478 {
479         int len = 0;
480         int temp;
481         char buf[16];           //enough for all info
482         /*
483          * We use the easy way, we don't care of off and count, so we don't set eof
484          * to 1
485          */
486
487         len += sprintf(page, ACPI_HOTK_NAME " " ASUS_ACPI_VERSION "\n");
488         len += sprintf(page + len, "Model reference    : %s\n",
489                        hotk->methods->name);
490         /* 
491          * The SFUN method probably allows the original driver to get the list 
492          * of features supported by a given model. For now, 0x0100 or 0x0800 
493          * bit signifies that the laptop is equipped with a Wi-Fi MiniPCI card.
494          * The significance of others is yet to be found.
495          */
496         if (read_acpi_int(hotk->handle, "SFUN", &temp))
497                 len +=
498                     sprintf(page + len, "SFUN value         : 0x%04x\n", temp);
499         /*
500          * Another value for userspace: the ASYM method returns 0x02 for
501          * battery low and 0x04 for battery critical, its readings tend to be
502          * more accurate than those provided by _BST. 
503          * Note: since not all the laptops provide this method, errors are
504          * silently ignored.
505          */
506         if (read_acpi_int(hotk->handle, "ASYM", &temp))
507                 len +=
508                     sprintf(page + len, "ASYM value         : 0x%04x\n", temp);
509         if (asus_info) {
510                 snprintf(buf, 16, "%d", asus_info->length);
511                 len += sprintf(page + len, "DSDT length        : %s\n", buf);
512                 snprintf(buf, 16, "%d", asus_info->checksum);
513                 len += sprintf(page + len, "DSDT checksum      : %s\n", buf);
514                 snprintf(buf, 16, "%d", asus_info->revision);
515                 len += sprintf(page + len, "DSDT revision      : %s\n", buf);
516                 snprintf(buf, 7, "%s", asus_info->oem_id);
517                 len += sprintf(page + len, "OEM id             : %s\n", buf);
518                 snprintf(buf, 9, "%s", asus_info->oem_table_id);
519                 len += sprintf(page + len, "OEM table id       : %s\n", buf);
520                 snprintf(buf, 16, "%x", asus_info->oem_revision);
521                 len += sprintf(page + len, "OEM revision       : 0x%s\n", buf);
522                 snprintf(buf, 5, "%s", asus_info->asl_compiler_id);
523                 len += sprintf(page + len, "ASL comp vendor id : %s\n", buf);
524                 snprintf(buf, 16, "%x", asus_info->asl_compiler_revision);
525                 len += sprintf(page + len, "ASL comp revision  : 0x%s\n", buf);
526         }
527
528         return len;
529 }
530
531 /*
532  * /proc handlers
533  * We write our info in page, we begin at offset off and cannot write more
534  * than count bytes. We set eof to 1 if we handle those 2 values. We return the
535  * number of bytes written in page
536  */
537
538 /* Generic LED functions */
539 static int read_led(const char *ledname, int ledmask)
540 {
541         if (ledname) {
542                 int led_status;
543
544                 if (read_acpi_int(NULL, ledname, &led_status))
545                         return led_status;
546                 else
547                         printk(KERN_WARNING "Asus ACPI: Error reading LED "
548                                "status\n");
549         }
550         return (hotk->status & ledmask) ? 1 : 0;
551 }
552
553 static int parse_arg(const char __user * buf, unsigned long count, int *val)
554 {
555         char s[32];
556         if (!count)
557                 return 0;
558         if (count > 31)
559                 return -EINVAL;
560         if (copy_from_user(s, buf, count))
561                 return -EFAULT;
562         s[count] = 0;
563         if (sscanf(s, "%i", val) != 1)
564                 return -EINVAL;
565         return count;
566 }
567
568 /* FIXME: kill extraneous args so it can be called independently */
569 static int
570 write_led(const char __user * buffer, unsigned long count,
571           char *ledname, int ledmask, int invert)
572 {
573         int rv, value;
574         int led_out = 0;
575
576         rv = parse_arg(buffer, count, &value);
577         if (rv > 0)
578                 led_out = value ? 1 : 0;
579
580         hotk->status =
581             (led_out) ? (hotk->status | ledmask) : (hotk->status & ~ledmask);
582
583         if (invert)             /* invert target value */
584                 led_out = !led_out & 0x1;
585
586         if (!write_acpi_int(hotk->handle, ledname, led_out, NULL))
587                 printk(KERN_WARNING "Asus ACPI: LED (%s) write failed\n",
588                        ledname);
589
590         return rv;
591 }
592
593 /*
594  * Proc handlers for MLED
595  */
596 static int
597 proc_read_mled(char *page, char **start, off_t off, int count, int *eof,
598                void *data)
599 {
600         return sprintf(page, "%d\n",
601                        read_led(hotk->methods->mled_status, MLED_ON));
602 }
603
604 static int
605 proc_write_mled(struct file *file, const char __user * buffer,
606                 unsigned long count, void *data)
607 {
608         return write_led(buffer, count, hotk->methods->mt_mled, MLED_ON, 1);
609 }
610
611 /*
612  * Proc handlers for LED display
613  */
614 static int
615 proc_read_ledd(char *page, char **start, off_t off, int count, int *eof,
616                void *data)
617 {
618         return sprintf(page, "0x%08x\n", hotk->ledd_status);
619 }
620
621 static int
622 proc_write_ledd(struct file *file, const char __user * buffer,
623                 unsigned long count, void *data)
624 {
625         int rv, value;
626
627         rv = parse_arg(buffer, count, &value);
628         if (rv > 0) {
629                 if (!write_acpi_int
630                     (hotk->handle, hotk->methods->mt_ledd, value, NULL))
631                         printk(KERN_WARNING
632                                "Asus ACPI: LED display write failed\n");
633                 else
634                         hotk->ledd_status = (u32) value;
635         }
636         return rv;
637 }
638
639 /*
640  * Proc handlers for WLED
641  */
642 static int
643 proc_read_wled(char *page, char **start, off_t off, int count, int *eof,
644                void *data)
645 {
646         return sprintf(page, "%d\n",
647                        read_led(hotk->methods->wled_status, WLED_ON));
648 }
649
650 static int
651 proc_write_wled(struct file *file, const char __user * buffer,
652                 unsigned long count, void *data)
653 {
654         return write_led(buffer, count, hotk->methods->mt_wled, WLED_ON, 0);
655 }
656
657 /*
658  * Proc handlers for Bluetooth
659  */
660 static int
661 proc_read_bluetooth(char *page, char **start, off_t off, int count, int *eof,
662                     void *data)
663 {
664         return sprintf(page, "%d\n", read_led(hotk->methods->bt_status, BT_ON));
665 }
666
667 static int
668 proc_write_bluetooth(struct file *file, const char __user * buffer,
669                      unsigned long count, void *data)
670 {
671         /* Note: mt_bt_switch controls both internal Bluetooth adapter's 
672            presence and its LED */
673         return write_led(buffer, count, hotk->methods->mt_bt_switch, BT_ON, 0);
674 }
675
676 /*
677  * Proc handlers for TLED
678  */
679 static int
680 proc_read_tled(char *page, char **start, off_t off, int count, int *eof,
681                void *data)
682 {
683         return sprintf(page, "%d\n",
684                        read_led(hotk->methods->tled_status, TLED_ON));
685 }
686
687 static int
688 proc_write_tled(struct file *file, const char __user * buffer,
689                 unsigned long count, void *data)
690 {
691         return write_led(buffer, count, hotk->methods->mt_tled, TLED_ON, 0);
692 }
693
694 static int get_lcd_state(void)
695 {
696         int lcd = 0;
697
698         if (hotk->model != L3H) {
699                 /* We don't have to check anything if we are here */
700                 if (!read_acpi_int(NULL, hotk->methods->lcd_status, &lcd))
701                         printk(KERN_WARNING
702                                "Asus ACPI: Error reading LCD status\n");
703
704                 if (hotk->model == L2D)
705                         lcd = ~lcd;
706         } else {                /* L3H and the like have to be handled differently */
707                 acpi_status status = 0;
708                 struct acpi_object_list input;
709                 union acpi_object mt_params[2];
710                 struct acpi_buffer output;
711                 union acpi_object out_obj;
712
713                 input.count = 2;
714                 input.pointer = mt_params;
715                 /* Note: the following values are partly guessed up, but 
716                    otherwise they seem to work */
717                 mt_params[0].type = ACPI_TYPE_INTEGER;
718                 mt_params[0].integer.value = 0x02;
719                 mt_params[1].type = ACPI_TYPE_INTEGER;
720                 mt_params[1].integer.value = 0x02;
721
722                 output.length = sizeof(out_obj);
723                 output.pointer = &out_obj;
724
725                 status =
726                     acpi_evaluate_object(NULL, hotk->methods->lcd_status,
727                                          &input, &output);
728                 if (status != AE_OK)
729                         return -1;
730                 if (out_obj.type == ACPI_TYPE_INTEGER)
731                         /* That's what the AML code does */
732                         lcd = out_obj.integer.value >> 8;
733         }
734
735         return (lcd & 1);
736 }
737
738 static int set_lcd_state(int value)
739 {
740         int lcd = 0;
741         acpi_status status = 0;
742
743         lcd = value ? 1 : 0;
744         if (lcd != get_lcd_state()) {
745                 /* switch */
746                 if (hotk->model != L3H) {
747                         status =
748                             acpi_evaluate_object(NULL,
749                                                  hotk->methods->mt_lcd_switch,
750                                                  NULL, NULL);
751                 } else {        /* L3H and the like have to be handled differently */
752                         if (!write_acpi_int
753                             (hotk->handle, hotk->methods->mt_lcd_switch, 0x07,
754                              NULL))
755                                 status = AE_ERROR;
756                         /* L3H's AML executes EHK (0x07) upon Fn+F7 keypress, 
757                            the exact behaviour is simulated here */
758                 }
759                 if (ACPI_FAILURE(status))
760                         printk(KERN_WARNING "Asus ACPI: Error switching LCD\n");
761         }
762         return 0;
763
764 }
765
766 static int
767 proc_read_lcd(char *page, char **start, off_t off, int count, int *eof,
768               void *data)
769 {
770         return sprintf(page, "%d\n", get_lcd_state());
771 }
772
773 static int
774 proc_write_lcd(struct file *file, const char __user * buffer,
775                unsigned long count, void *data)
776 {
777         int rv, value;
778
779         rv = parse_arg(buffer, count, &value);
780         if (rv > 0)
781                 set_lcd_state(value);
782         return rv;
783 }
784
785 static int read_brightness(struct backlight_device *bd)
786 {
787         int value;
788
789         if (hotk->methods->brightness_get) {    /* SPLV/GPLV laptop */
790                 if (!read_acpi_int(hotk->handle, hotk->methods->brightness_get,
791                                    &value))
792                         printk(KERN_WARNING
793                                "Asus ACPI: Error reading brightness\n");
794         } else if (hotk->methods->brightness_status) {  /* For D1 for example */
795                 if (!read_acpi_int(NULL, hotk->methods->brightness_status,
796                                    &value))
797                         printk(KERN_WARNING
798                                "Asus ACPI: Error reading brightness\n");
799         } else                  /* No GPLV method */
800                 value = hotk->brightness;
801         return value;
802 }
803
804 /*
805  * Change the brightness level
806  */
807 static int set_brightness(int value)
808 {
809         acpi_status status = 0;
810         int ret = 0;
811
812         /* SPLV laptop */
813         if (hotk->methods->brightness_set) {
814                 if (!write_acpi_int(hotk->handle, hotk->methods->brightness_set,
815                                     value, NULL))
816                         printk(KERN_WARNING
817                                "Asus ACPI: Error changing brightness\n");
818                         ret = -EIO;
819                 goto out;
820         }
821
822         /* No SPLV method if we are here, act as appropriate */
823         value -= read_brightness(NULL);
824         while (value != 0) {
825                 status = acpi_evaluate_object(NULL, (value > 0) ?
826                                               hotk->methods->brightness_up :
827                                               hotk->methods->brightness_down,
828                                               NULL, NULL);
829                 (value > 0) ? value-- : value++;
830                 if (ACPI_FAILURE(status))
831                         printk(KERN_WARNING
832                                "Asus ACPI: Error changing brightness\n");
833                         ret = -EIO;
834         }
835 out:
836         return ret;
837 }
838
839 static int set_brightness_status(struct backlight_device *bd)
840 {
841         return set_brightness(bd->props->brightness);
842 }
843
844 static int
845 proc_read_brn(char *page, char **start, off_t off, int count, int *eof,
846               void *data)
847 {
848         return sprintf(page, "%d\n", read_brightness(NULL));
849 }
850
851 static int
852 proc_write_brn(struct file *file, const char __user * buffer,
853                unsigned long count, void *data)
854 {
855         int rv, value;
856
857         rv = parse_arg(buffer, count, &value);
858         if (rv > 0) {
859                 value = (0 < value) ? ((15 < value) ? 15 : value) : 0;
860                 /* 0 <= value <= 15 */
861                 set_brightness(value);
862         }
863         return rv;
864 }
865
866 static void set_display(int value)
867 {
868         /* no sanity check needed for now */
869         if (!write_acpi_int(hotk->handle, hotk->methods->display_set,
870                             value, NULL))
871                 printk(KERN_WARNING "Asus ACPI: Error setting display\n");
872         return;
873 }
874
875 /*
876  * Now, *this* one could be more user-friendly, but so far, no-one has 
877  * complained. The significance of bits is the same as in proc_write_disp()
878  */
879 static int
880 proc_read_disp(char *page, char **start, off_t off, int count, int *eof,
881                void *data)
882 {
883         int value = 0;
884
885         if (!read_acpi_int(hotk->handle, hotk->methods->display_get, &value))
886                 printk(KERN_WARNING
887                        "Asus ACPI: Error reading display status\n");
888         value &= 0x07;          /* needed for some models, shouldn't hurt others */
889         return sprintf(page, "%d\n", value);
890 }
891
892 /*
893  * Experimental support for display switching. As of now: 1 should activate 
894  * the LCD output, 2 should do for CRT, and 4 for TV-Out. Any combination 
895  * (bitwise) of these will suffice. I never actually tested 3 displays hooked up 
896  * simultaneously, so be warned. See the acpi4asus README for more info.
897  */
898 static int
899 proc_write_disp(struct file *file, const char __user * buffer,
900                 unsigned long count, void *data)
901 {
902         int rv, value;
903
904         rv = parse_arg(buffer, count, &value);
905         if (rv > 0)
906                 set_display(value);
907         return rv;
908 }
909
910 typedef int (proc_readfunc) (char *page, char **start, off_t off, int count,
911                              int *eof, void *data);
912 typedef int (proc_writefunc) (struct file * file, const char __user * buffer,
913                               unsigned long count, void *data);
914
915 static int
916 asus_proc_add(char *name, proc_writefunc * writefunc,
917                      proc_readfunc * readfunc, mode_t mode,
918                      struct acpi_device *device)
919 {
920         struct proc_dir_entry *proc =
921             create_proc_entry(name, mode, acpi_device_dir(device));
922         if (!proc) {
923                 printk(KERN_WARNING "  Unable to create %s fs entry\n", name);
924                 return -1;
925         }
926         proc->write_proc = writefunc;
927         proc->read_proc = readfunc;
928         proc->data = acpi_driver_data(device);
929         proc->owner = THIS_MODULE;
930         proc->uid = asus_uid;
931         proc->gid = asus_gid;
932         return 0;
933 }
934
935 static int asus_hotk_add_fs(struct acpi_device *device)
936 {
937         struct proc_dir_entry *proc;
938         mode_t mode;
939
940         /*
941          * If parameter uid or gid is not changed, keep the default setting for
942          * our proc entries (-rw-rw-rw-) else, it means we care about security,
943          * and then set to -rw-rw----
944          */
945
946         if ((asus_uid == 0) && (asus_gid == 0)) {
947                 mode = S_IFREG | S_IRUGO | S_IWUGO;
948         } else {
949                 mode = S_IFREG | S_IRUSR | S_IRGRP | S_IWUSR | S_IWGRP;
950                 printk(KERN_WARNING "  asus_uid and asus_gid parameters are "
951                        "deprecated, use chown and chmod instead!\n");
952         }
953
954         acpi_device_dir(device) = asus_proc_dir;
955         if (!acpi_device_dir(device))
956                 return -ENODEV;
957
958         proc = create_proc_entry(PROC_INFO, mode, acpi_device_dir(device));
959         if (proc) {
960                 proc->read_proc = proc_read_info;
961                 proc->data = acpi_driver_data(device);
962                 proc->owner = THIS_MODULE;
963                 proc->uid = asus_uid;
964                 proc->gid = asus_gid;
965         } else {
966                 printk(KERN_WARNING "  Unable to create " PROC_INFO
967                        " fs entry\n");
968         }
969
970         if (hotk->methods->mt_wled) {
971                 asus_proc_add(PROC_WLED, &proc_write_wled, &proc_read_wled,
972                               mode, device);
973         }
974
975         if (hotk->methods->mt_ledd) {
976                 asus_proc_add(PROC_LEDD, &proc_write_ledd, &proc_read_ledd,
977                               mode, device);
978         }
979
980         if (hotk->methods->mt_mled) {
981                 asus_proc_add(PROC_MLED, &proc_write_mled, &proc_read_mled,
982                               mode, device);
983         }
984
985         if (hotk->methods->mt_tled) {
986                 asus_proc_add(PROC_TLED, &proc_write_tled, &proc_read_tled,
987                               mode, device);
988         }
989
990         if (hotk->methods->mt_bt_switch) {
991                 asus_proc_add(PROC_BT, &proc_write_bluetooth,
992                               &proc_read_bluetooth, mode, device);
993         }
994
995         /* 
996          * We need both read node and write method as LCD switch is also accessible
997          * from keyboard 
998          */
999         if (hotk->methods->mt_lcd_switch && hotk->methods->lcd_status) {
1000                 asus_proc_add(PROC_LCD, &proc_write_lcd, &proc_read_lcd, mode,
1001                               device);
1002         }
1003
1004         if ((hotk->methods->brightness_up && hotk->methods->brightness_down) ||
1005             (hotk->methods->brightness_get && hotk->methods->brightness_set)) {
1006                 asus_proc_add(PROC_BRN, &proc_write_brn, &proc_read_brn, mode,
1007                               device);
1008         }
1009
1010         if (hotk->methods->display_set) {
1011                 asus_proc_add(PROC_DISP, &proc_write_disp, &proc_read_disp,
1012                               mode, device);
1013         }
1014
1015         return 0;
1016 }
1017
1018 static int asus_hotk_remove_fs(struct acpi_device *device)
1019 {
1020         if (acpi_device_dir(device)) {
1021                 remove_proc_entry(PROC_INFO, acpi_device_dir(device));
1022                 if (hotk->methods->mt_wled)
1023                         remove_proc_entry(PROC_WLED, acpi_device_dir(device));
1024                 if (hotk->methods->mt_mled)
1025                         remove_proc_entry(PROC_MLED, acpi_device_dir(device));
1026                 if (hotk->methods->mt_tled)
1027                         remove_proc_entry(PROC_TLED, acpi_device_dir(device));
1028                 if (hotk->methods->mt_ledd)
1029                         remove_proc_entry(PROC_LEDD, acpi_device_dir(device));
1030                 if (hotk->methods->mt_bt_switch)
1031                         remove_proc_entry(PROC_BT, acpi_device_dir(device));
1032                 if (hotk->methods->mt_lcd_switch && hotk->methods->lcd_status)
1033                         remove_proc_entry(PROC_LCD, acpi_device_dir(device));
1034                 if ((hotk->methods->brightness_up
1035                      && hotk->methods->brightness_down)
1036                     || (hotk->methods->brightness_get
1037                         && hotk->methods->brightness_set))
1038                         remove_proc_entry(PROC_BRN, acpi_device_dir(device));
1039                 if (hotk->methods->display_set)
1040                         remove_proc_entry(PROC_DISP, acpi_device_dir(device));
1041         }
1042         return 0;
1043 }
1044
1045 static void asus_hotk_notify(acpi_handle handle, u32 event, void *data)
1046 {
1047         /* TODO Find a better way to handle events count. */
1048         if (!hotk)
1049                 return;
1050
1051         if ((event & ~((u32) BR_UP)) < 16) {
1052                 hotk->brightness = (event & ~((u32) BR_UP));
1053         } else if ((event & ~((u32) BR_DOWN)) < 16) {
1054                 hotk->brightness = (event & ~((u32) BR_DOWN));
1055         }
1056
1057         acpi_bus_generate_event(hotk->device, event,
1058                                 hotk->event_count[event % 128]++);
1059
1060         return;
1061 }
1062
1063 /*
1064  * Match the model string to the list of supported models. Return END_MODEL if
1065  * no match or model is NULL.
1066  */
1067 static int asus_model_match(char *model)
1068 {
1069         if (model == NULL)
1070                 return END_MODEL;
1071
1072         if (strncmp(model, "L3D", 3) == 0)
1073                 return L3D;
1074         else if (strncmp(model, "L2E", 3) == 0 ||
1075                  strncmp(model, "L3H", 3) == 0 || strncmp(model, "L5D", 3) == 0)
1076                 return L3H;
1077         else if (strncmp(model, "L3", 2) == 0 || strncmp(model, "L2B", 3) == 0)
1078                 return L3C;
1079         else if (strncmp(model, "L8L", 3) == 0)
1080                 return L8L;
1081         else if (strncmp(model, "L4R", 3) == 0)
1082                 return L4R;
1083         else if (strncmp(model, "M6N", 3) == 0 || strncmp(model, "W3N", 3) == 0)
1084                 return M6N;
1085         else if (strncmp(model, "M6R", 3) == 0 || strncmp(model, "A3G", 3) == 0)
1086                 return M6R;
1087         else if (strncmp(model, "M2N", 3) == 0 ||
1088                  strncmp(model, "M3N", 3) == 0 ||
1089                  strncmp(model, "M5N", 3) == 0 ||
1090                  strncmp(model, "M6N", 3) == 0 ||
1091                  strncmp(model, "S1N", 3) == 0 ||
1092                  strncmp(model, "S5N", 3) == 0 || strncmp(model, "W1N", 3) == 0)
1093                 return xxN;
1094         else if (strncmp(model, "M1", 2) == 0)
1095                 return M1A;
1096         else if (strncmp(model, "M2", 2) == 0 || strncmp(model, "L4E", 3) == 0)
1097                 return M2E;
1098         else if (strncmp(model, "L2", 2) == 0)
1099                 return L2D;
1100         else if (strncmp(model, "L8", 2) == 0)
1101                 return S1x;
1102         else if (strncmp(model, "D1", 2) == 0)
1103                 return D1x;
1104         else if (strncmp(model, "A1", 2) == 0)
1105                 return A1x;
1106         else if (strncmp(model, "A2", 2) == 0)
1107                 return A2x;
1108         else if (strncmp(model, "J1", 2) == 0)
1109                 return S2x;
1110         else if (strncmp(model, "L5", 2) == 0)
1111                 return L5x;
1112         else if (strncmp(model, "A4G", 3) == 0)
1113                 return A4G;
1114         else if (strncmp(model, "W1N", 3) == 0)
1115                 return W1N;
1116         else if (strncmp(model, "W3V", 3) == 0)
1117                 return W3V;
1118         else if (strncmp(model, "W5A", 3) == 0)
1119                 return W5A;
1120         else
1121                 return END_MODEL;
1122 }
1123
1124 /*
1125  * This function is used to initialize the hotk with right values. In this
1126  * method, we can make all the detection we want, and modify the hotk struct
1127  */
1128 static int asus_hotk_get_info(void)
1129 {
1130         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1131         struct acpi_buffer dsdt = { ACPI_ALLOCATE_BUFFER, NULL };
1132         union acpi_object *model = NULL;
1133         int bsts_result;
1134         char *string = NULL;
1135         acpi_status status;
1136
1137         /*
1138          * Get DSDT headers early enough to allow for differentiating between 
1139          * models, but late enough to allow acpi_bus_register_driver() to fail 
1140          * before doing anything ACPI-specific. Should we encounter a machine,
1141          * which needs special handling (i.e. its hotkey device has a different
1142          * HID), this bit will be moved. A global variable asus_info contains
1143          * the DSDT header.
1144          */
1145         status = acpi_get_table(ACPI_TABLE_ID_DSDT, 1, &dsdt);
1146         if (ACPI_FAILURE(status))
1147                 printk(KERN_WARNING "  Couldn't get the DSDT table header\n");
1148         else
1149                 asus_info = dsdt.pointer;
1150
1151         /* We have to write 0 on init this far for all ASUS models */
1152         if (!write_acpi_int(hotk->handle, "INIT", 0, &buffer)) {
1153                 printk(KERN_ERR "  Hotkey initialization failed\n");
1154                 return -ENODEV;
1155         }
1156
1157         /* This needs to be called for some laptops to init properly */
1158         if (!read_acpi_int(hotk->handle, "BSTS", &bsts_result))
1159                 printk(KERN_WARNING "  Error calling BSTS\n");
1160         else if (bsts_result)
1161                 printk(KERN_NOTICE "  BSTS called, 0x%02x returned\n",
1162                        bsts_result);
1163
1164         /*
1165          * Try to match the object returned by INIT to the specific model.
1166          * Handle every possible object (or the lack of thereof) the DSDT 
1167          * writers might throw at us. When in trouble, we pass NULL to 
1168          * asus_model_match() and try something completely different.
1169          */
1170         if (buffer.pointer) {
1171                 model = buffer.pointer;
1172                 switch (model->type) {
1173                 case ACPI_TYPE_STRING:
1174                         string = model->string.pointer;
1175                         break;
1176                 case ACPI_TYPE_BUFFER:
1177                         string = model->buffer.pointer;
1178                         break;
1179                 default:
1180                         kfree(model);
1181                         break;
1182                 }
1183         }
1184         hotk->model = asus_model_match(string);
1185         if (hotk->model == END_MODEL) { /* match failed */
1186                 if (asus_info &&
1187                     strncmp(asus_info->oem_table_id, "ODEM", 4) == 0) {
1188                         hotk->model = P30;
1189                         printk(KERN_NOTICE
1190                                "  Samsung P30 detected, supported\n");
1191                 } else {
1192                         hotk->model = M2E;
1193                         printk(KERN_NOTICE "  unsupported model %s, trying "
1194                                "default values\n", string);
1195                         printk(KERN_NOTICE
1196                                "  send /proc/acpi/dsdt to the developers\n");
1197                 }
1198                 hotk->methods = &model_conf[hotk->model];
1199                 return AE_OK;
1200         }
1201         hotk->methods = &model_conf[hotk->model];
1202         printk(KERN_NOTICE "  %s model detected, supported\n", string);
1203
1204         /* Sort of per-model blacklist */
1205         if (strncmp(string, "L2B", 3) == 0)
1206                 hotk->methods->lcd_status = NULL;
1207         /* L2B is similar enough to L3C to use its settings, with this only 
1208            exception */
1209         else if (strncmp(string, "A3G", 3) == 0)
1210                 hotk->methods->lcd_status = "\\BLFG";
1211         /* A3G is like M6R */
1212         else if (strncmp(string, "S5N", 3) == 0 ||
1213                  strncmp(string, "M5N", 3) == 0 ||
1214                  strncmp(string, "W3N", 3) == 0)
1215                 hotk->methods->mt_mled = NULL;
1216         /* S5N, M5N and W3N have no MLED */
1217         else if (strncmp(string, "L5D", 3) == 0)
1218                 hotk->methods->mt_wled = NULL;
1219         /* L5D's WLED is not controlled by ACPI */
1220         else if (strncmp(string, "M2N", 3) == 0 ||
1221                  strncmp(string, "W3V", 3) == 0 ||
1222                  strncmp(string, "S1N", 3) == 0)
1223                 hotk->methods->mt_wled = "WLED";
1224         /* M2N, S1N and W3V have a usable WLED */
1225         else if (asus_info) {
1226                 if (strncmp(asus_info->oem_table_id, "L1", 2) == 0)
1227                         hotk->methods->mled_status = NULL;
1228                 /* S1300A reports L84F, but L1400B too, account for that */
1229         }
1230
1231         kfree(model);
1232
1233         return AE_OK;
1234 }
1235
1236 static int asus_hotk_check(void)
1237 {
1238         int result = 0;
1239
1240         result = acpi_bus_get_status(hotk->device);
1241         if (result)
1242                 return result;
1243
1244         if (hotk->device->status.present) {
1245                 result = asus_hotk_get_info();
1246         } else {
1247                 printk(KERN_ERR "  Hotkey device not present, aborting\n");
1248                 return -EINVAL;
1249         }
1250
1251         return result;
1252 }
1253
1254 static int asus_hotk_found;
1255
1256 static int asus_hotk_add(struct acpi_device *device)
1257 {
1258         acpi_status status = AE_OK;
1259         int result;
1260
1261         if (!device)
1262                 return -EINVAL;
1263
1264         printk(KERN_NOTICE "Asus Laptop ACPI Extras version %s\n",
1265                ASUS_ACPI_VERSION);
1266
1267         hotk = kzalloc(sizeof(struct asus_hotk), GFP_KERNEL);
1268         if (!hotk)
1269                 return -ENOMEM;
1270
1271         hotk->handle = device->handle;
1272         strcpy(acpi_device_name(device), ACPI_HOTK_DEVICE_NAME);
1273         strcpy(acpi_device_class(device), ACPI_HOTK_CLASS);
1274         acpi_driver_data(device) = hotk;
1275         hotk->device = device;
1276
1277         result = asus_hotk_check();
1278         if (result)
1279                 goto end;
1280
1281         result = asus_hotk_add_fs(device);
1282         if (result)
1283                 goto end;
1284
1285         /*
1286          * We install the handler, it will receive the hotk in parameter, so, we
1287          * could add other data to the hotk struct
1288          */
1289         status = acpi_install_notify_handler(hotk->handle, ACPI_SYSTEM_NOTIFY,
1290                                              asus_hotk_notify, hotk);
1291         if (ACPI_FAILURE(status))
1292                 printk(KERN_ERR "  Error installing notify handler\n");
1293
1294         /* For laptops without GPLV: init the hotk->brightness value */
1295         if ((!hotk->methods->brightness_get)
1296             && (!hotk->methods->brightness_status)
1297             && (hotk->methods->brightness_up && hotk->methods->brightness_down)) {
1298                 status =
1299                     acpi_evaluate_object(NULL, hotk->methods->brightness_down,
1300                                          NULL, NULL);
1301                 if (ACPI_FAILURE(status))
1302                         printk(KERN_WARNING "  Error changing brightness\n");
1303                 else {
1304                         status =
1305                             acpi_evaluate_object(NULL,
1306                                                  hotk->methods->brightness_up,
1307                                                  NULL, NULL);
1308                         if (ACPI_FAILURE(status))
1309                                 printk(KERN_WARNING "  Strange, error changing"
1310                                        " brightness\n");
1311                 }
1312         }
1313
1314         asus_hotk_found = 1;
1315
1316         /* LED display is off by default */
1317         hotk->ledd_status = 0xFFF;
1318
1319       end:
1320         if (result) {
1321                 kfree(hotk);
1322         }
1323
1324         return result;
1325 }
1326
1327 static int asus_hotk_remove(struct acpi_device *device, int type)
1328 {
1329         acpi_status status = 0;
1330
1331         if (!device || !acpi_driver_data(device))
1332                 return -EINVAL;
1333
1334         status = acpi_remove_notify_handler(hotk->handle, ACPI_SYSTEM_NOTIFY,
1335                                             asus_hotk_notify);
1336         if (ACPI_FAILURE(status))
1337                 printk(KERN_ERR "Asus ACPI: Error removing notify handler\n");
1338
1339         asus_hotk_remove_fs(device);
1340
1341         kfree(hotk);
1342
1343         return 0;
1344 }
1345
1346 static struct backlight_properties asus_backlight_data = {
1347         .owner          = THIS_MODULE,
1348         .get_brightness = read_brightness,
1349         .update_status  = set_brightness_status,
1350         .max_brightness = 15,
1351 };
1352
1353 static void __exit asus_acpi_exit(void)
1354 {
1355         if (asus_backlight_device)
1356                 backlight_device_unregister(asus_backlight_device);
1357
1358         acpi_bus_unregister_driver(&asus_hotk_driver);
1359         remove_proc_entry(PROC_ASUS, acpi_root_dir);
1360
1361         kfree(asus_info);
1362
1363         return;
1364 }
1365
1366 static int __init asus_acpi_init(void)
1367 {
1368         int result;
1369
1370         if (acpi_disabled)
1371                 return -ENODEV;
1372
1373         if (!acpi_specific_hotkey_enabled) {
1374                 printk(KERN_ERR "Using generic hotkey driver\n");
1375                 return -ENODEV;
1376         }
1377         asus_proc_dir = proc_mkdir(PROC_ASUS, acpi_root_dir);
1378         if (!asus_proc_dir) {
1379                 printk(KERN_ERR "Asus ACPI: Unable to create /proc entry\n");
1380                 return -ENODEV;
1381         }
1382         asus_proc_dir->owner = THIS_MODULE;
1383
1384         result = acpi_bus_register_driver(&asus_hotk_driver);
1385         if (result < 0) {
1386                 remove_proc_entry(PROC_ASUS, acpi_root_dir);
1387                 return result;
1388         }
1389
1390         /*
1391          * This is a bit of a kludge.  We only want this module loaded
1392          * for ASUS systems, but there's currently no way to probe the
1393          * ACPI namespace for ASUS HIDs.  So we just return failure if
1394          * we didn't find one, which will cause the module to be
1395          * unloaded.
1396          */
1397         if (!asus_hotk_found) {
1398                 acpi_bus_unregister_driver(&asus_hotk_driver);
1399                 remove_proc_entry(PROC_ASUS, acpi_root_dir);
1400                 return result;
1401         }
1402
1403         asus_backlight_device = backlight_device_register("asus",NULL,NULL,
1404                                                           &asus_backlight_data);
1405         if (IS_ERR(asus_backlight_device)) {
1406                 printk(KERN_ERR "Could not register asus backlight device\n");
1407                 asus_backlight_device = NULL;
1408                 asus_acpi_exit();
1409         }
1410
1411         return 0;
1412 }
1413
1414 module_init(asus_acpi_init);
1415 module_exit(asus_acpi_exit);