rt2x00: correct "skb_buff" typo
[linux-2.6] / 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  *  �ic 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
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                 W3V,            //W3030V
142                 xxN,            //M2400N, M3700N, M5200N, M6800N, S1300N, S5200N
143                 A4S,            //Z81sp
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                 .name              = "A4S",
404                 .brightness_set    = "SPLV",
405                 .brightness_get    = "GPLV",
406                 .mt_bt_switch      = "BLED",
407                 .mt_wled           = "WLED"
408         }
409
410 };
411
412 /* procdir we use */
413 static struct proc_dir_entry *asus_proc_dir;
414
415 static struct backlight_device *asus_backlight_device;
416
417 /*
418  * This header is made available to allow proper configuration given model,
419  * revision number , ... this info cannot go in struct asus_hotk because it is
420  * available before the hotk
421  */
422 static struct acpi_table_header *asus_info;
423
424 /* The actual device the driver binds to */
425 static struct asus_hotk *hotk;
426
427 /*
428  * The hotkey driver and autoloading declaration
429  */
430 static int asus_hotk_add(struct acpi_device *device);
431 static int asus_hotk_remove(struct acpi_device *device, int type);
432 static const struct acpi_device_id asus_device_ids[] = {
433         {"ATK0100", 0},
434         {"", 0},
435 };
436 MODULE_DEVICE_TABLE(acpi, asus_device_ids);
437
438 static struct acpi_driver asus_hotk_driver = {
439         .name = "asus_acpi",
440         .class = ACPI_HOTK_CLASS,
441         .ids = asus_device_ids,
442         .ops = {
443                 .add = asus_hotk_add,
444                 .remove = asus_hotk_remove,
445                 },
446 };
447
448 /* 
449  * This function evaluates an ACPI method, given an int as parameter, the
450  * method is searched within the scope of the handle, can be NULL. The output
451  * of the method is written is output, which can also be NULL
452  *
453  * returns 1 if write is successful, 0 else. 
454  */
455 static int write_acpi_int(acpi_handle handle, const char *method, int val,
456                           struct acpi_buffer *output)
457 {
458         struct acpi_object_list params; //list of input parameters (an int here)
459         union acpi_object in_obj;       //the only param we use
460         acpi_status status;
461
462         params.count = 1;
463         params.pointer = &in_obj;
464         in_obj.type = ACPI_TYPE_INTEGER;
465         in_obj.integer.value = val;
466
467         status = acpi_evaluate_object(handle, (char *)method, &params, output);
468         return (status == AE_OK);
469 }
470
471 static int read_acpi_int(acpi_handle handle, const char *method, int *val)
472 {
473         struct acpi_buffer output;
474         union acpi_object out_obj;
475         acpi_status status;
476
477         output.length = sizeof(out_obj);
478         output.pointer = &out_obj;
479
480         status = acpi_evaluate_object(handle, (char *)method, NULL, &output);
481         *val = out_obj.integer.value;
482         return (status == AE_OK) && (out_obj.type == ACPI_TYPE_INTEGER);
483 }
484
485 /*
486  * We write our info in page, we begin at offset off and cannot write more
487  * than count bytes. We set eof to 1 if we handle those 2 values. We return the
488  * number of bytes written in page
489  */
490 static int
491 proc_read_info(char *page, char **start, off_t off, int count, int *eof,
492                void *data)
493 {
494         int len = 0;
495         int temp;
496         char buf[16];           //enough for all info
497         /*
498          * We use the easy way, we don't care of off and count, so we don't set eof
499          * to 1
500          */
501
502         len += sprintf(page, ACPI_HOTK_NAME " " ASUS_ACPI_VERSION "\n");
503         len += sprintf(page + len, "Model reference    : %s\n",
504                        hotk->methods->name);
505         /* 
506          * The SFUN method probably allows the original driver to get the list 
507          * of features supported by a given model. For now, 0x0100 or 0x0800 
508          * bit signifies that the laptop is equipped with a Wi-Fi MiniPCI card.
509          * The significance of others is yet to be found.
510          */
511         if (read_acpi_int(hotk->handle, "SFUN", &temp))
512                 len +=
513                     sprintf(page + len, "SFUN value         : 0x%04x\n", temp);
514         /*
515          * Another value for userspace: the ASYM method returns 0x02 for
516          * battery low and 0x04 for battery critical, its readings tend to be
517          * more accurate than those provided by _BST. 
518          * Note: since not all the laptops provide this method, errors are
519          * silently ignored.
520          */
521         if (read_acpi_int(hotk->handle, "ASYM", &temp))
522                 len +=
523                     sprintf(page + len, "ASYM value         : 0x%04x\n", temp);
524         if (asus_info) {
525                 snprintf(buf, 16, "%d", asus_info->length);
526                 len += sprintf(page + len, "DSDT length        : %s\n", buf);
527                 snprintf(buf, 16, "%d", asus_info->checksum);
528                 len += sprintf(page + len, "DSDT checksum      : %s\n", buf);
529                 snprintf(buf, 16, "%d", asus_info->revision);
530                 len += sprintf(page + len, "DSDT revision      : %s\n", buf);
531                 snprintf(buf, 7, "%s", asus_info->oem_id);
532                 len += sprintf(page + len, "OEM id             : %s\n", buf);
533                 snprintf(buf, 9, "%s", asus_info->oem_table_id);
534                 len += sprintf(page + len, "OEM table id       : %s\n", buf);
535                 snprintf(buf, 16, "%x", asus_info->oem_revision);
536                 len += sprintf(page + len, "OEM revision       : 0x%s\n", buf);
537                 snprintf(buf, 5, "%s", asus_info->asl_compiler_id);
538                 len += sprintf(page + len, "ASL comp vendor id : %s\n", buf);
539                 snprintf(buf, 16, "%x", asus_info->asl_compiler_revision);
540                 len += sprintf(page + len, "ASL comp revision  : 0x%s\n", buf);
541         }
542
543         return len;
544 }
545
546 /*
547  * /proc handlers
548  * We write our info in page, we begin at offset off and cannot write more
549  * than count bytes. We set eof to 1 if we handle those 2 values. We return the
550  * number of bytes written in page
551  */
552
553 /* Generic LED functions */
554 static int read_led(const char *ledname, int ledmask)
555 {
556         if (ledname) {
557                 int led_status;
558
559                 if (read_acpi_int(NULL, ledname, &led_status))
560                         return led_status;
561                 else
562                         printk(KERN_WARNING "Asus ACPI: Error reading LED "
563                                "status\n");
564         }
565         return (hotk->status & ledmask) ? 1 : 0;
566 }
567
568 static int parse_arg(const char __user * buf, unsigned long count, int *val)
569 {
570         char s[32];
571         if (!count)
572                 return 0;
573         if (count > 31)
574                 return -EINVAL;
575         if (copy_from_user(s, buf, count))
576                 return -EFAULT;
577         s[count] = 0;
578         if (sscanf(s, "%i", val) != 1)
579                 return -EINVAL;
580         return count;
581 }
582
583 /* FIXME: kill extraneous args so it can be called independently */
584 static int
585 write_led(const char __user * buffer, unsigned long count,
586           char *ledname, int ledmask, int invert)
587 {
588         int rv, value;
589         int led_out = 0;
590
591         rv = parse_arg(buffer, count, &value);
592         if (rv > 0)
593                 led_out = value ? 1 : 0;
594
595         hotk->status =
596             (led_out) ? (hotk->status | ledmask) : (hotk->status & ~ledmask);
597
598         if (invert)             /* invert target value */
599                 led_out = !led_out & 0x1;
600
601         if (!write_acpi_int(hotk->handle, ledname, led_out, NULL))
602                 printk(KERN_WARNING "Asus ACPI: LED (%s) write failed\n",
603                        ledname);
604
605         return rv;
606 }
607
608 /*
609  * Proc handlers for MLED
610  */
611 static int
612 proc_read_mled(char *page, char **start, off_t off, int count, int *eof,
613                void *data)
614 {
615         return sprintf(page, "%d\n",
616                        read_led(hotk->methods->mled_status, MLED_ON));
617 }
618
619 static int
620 proc_write_mled(struct file *file, const char __user * buffer,
621                 unsigned long count, void *data)
622 {
623         return write_led(buffer, count, hotk->methods->mt_mled, MLED_ON, 1);
624 }
625
626 /*
627  * Proc handlers for LED display
628  */
629 static int
630 proc_read_ledd(char *page, char **start, off_t off, int count, int *eof,
631                void *data)
632 {
633         return sprintf(page, "0x%08x\n", hotk->ledd_status);
634 }
635
636 static int
637 proc_write_ledd(struct file *file, const char __user * buffer,
638                 unsigned long count, void *data)
639 {
640         int rv, value;
641
642         rv = parse_arg(buffer, count, &value);
643         if (rv > 0) {
644                 if (!write_acpi_int
645                     (hotk->handle, hotk->methods->mt_ledd, value, NULL))
646                         printk(KERN_WARNING
647                                "Asus ACPI: LED display write failed\n");
648                 else
649                         hotk->ledd_status = (u32) value;
650         }
651         return rv;
652 }
653
654 /*
655  * Proc handlers for WLED
656  */
657 static int
658 proc_read_wled(char *page, char **start, off_t off, int count, int *eof,
659                void *data)
660 {
661         return sprintf(page, "%d\n",
662                        read_led(hotk->methods->wled_status, WLED_ON));
663 }
664
665 static int
666 proc_write_wled(struct file *file, const char __user * buffer,
667                 unsigned long count, void *data)
668 {
669         return write_led(buffer, count, hotk->methods->mt_wled, WLED_ON, 0);
670 }
671
672 /*
673  * Proc handlers for Bluetooth
674  */
675 static int
676 proc_read_bluetooth(char *page, char **start, off_t off, int count, int *eof,
677                     void *data)
678 {
679         return sprintf(page, "%d\n", read_led(hotk->methods->bt_status, BT_ON));
680 }
681
682 static int
683 proc_write_bluetooth(struct file *file, const char __user * buffer,
684                      unsigned long count, void *data)
685 {
686         /* Note: mt_bt_switch controls both internal Bluetooth adapter's 
687            presence and its LED */
688         return write_led(buffer, count, hotk->methods->mt_bt_switch, BT_ON, 0);
689 }
690
691 /*
692  * Proc handlers for TLED
693  */
694 static int
695 proc_read_tled(char *page, char **start, off_t off, int count, int *eof,
696                void *data)
697 {
698         return sprintf(page, "%d\n",
699                        read_led(hotk->methods->tled_status, TLED_ON));
700 }
701
702 static int
703 proc_write_tled(struct file *file, const char __user * buffer,
704                 unsigned long count, void *data)
705 {
706         return write_led(buffer, count, hotk->methods->mt_tled, TLED_ON, 0);
707 }
708
709 static int get_lcd_state(void)
710 {
711         int lcd = 0;
712
713         if (hotk->model != L3H) {
714                 /* We don't have to check anything if we are here */
715                 if (!read_acpi_int(NULL, hotk->methods->lcd_status, &lcd))
716                         printk(KERN_WARNING
717                                "Asus ACPI: Error reading LCD status\n");
718
719                 if (hotk->model == L2D)
720                         lcd = ~lcd;
721         } else {                /* L3H and the like have to be handled differently */
722                 acpi_status status = 0;
723                 struct acpi_object_list input;
724                 union acpi_object mt_params[2];
725                 struct acpi_buffer output;
726                 union acpi_object out_obj;
727
728                 input.count = 2;
729                 input.pointer = mt_params;
730                 /* Note: the following values are partly guessed up, but 
731                    otherwise they seem to work */
732                 mt_params[0].type = ACPI_TYPE_INTEGER;
733                 mt_params[0].integer.value = 0x02;
734                 mt_params[1].type = ACPI_TYPE_INTEGER;
735                 mt_params[1].integer.value = 0x02;
736
737                 output.length = sizeof(out_obj);
738                 output.pointer = &out_obj;
739
740                 status =
741                     acpi_evaluate_object(NULL, hotk->methods->lcd_status,
742                                          &input, &output);
743                 if (status != AE_OK)
744                         return -1;
745                 if (out_obj.type == ACPI_TYPE_INTEGER)
746                         /* That's what the AML code does */
747                         lcd = out_obj.integer.value >> 8;
748         }
749
750         return (lcd & 1);
751 }
752
753 static int set_lcd_state(int value)
754 {
755         int lcd = 0;
756         acpi_status status = 0;
757
758         lcd = value ? 1 : 0;
759         if (lcd != get_lcd_state()) {
760                 /* switch */
761                 if (hotk->model != L3H) {
762                         status =
763                             acpi_evaluate_object(NULL,
764                                                  hotk->methods->mt_lcd_switch,
765                                                  NULL, NULL);
766                 } else {        /* L3H and the like have to be handled differently */
767                         if (!write_acpi_int
768                             (hotk->handle, hotk->methods->mt_lcd_switch, 0x07,
769                              NULL))
770                                 status = AE_ERROR;
771                         /* L3H's AML executes EHK (0x07) upon Fn+F7 keypress, 
772                            the exact behaviour is simulated here */
773                 }
774                 if (ACPI_FAILURE(status))
775                         printk(KERN_WARNING "Asus ACPI: Error switching LCD\n");
776         }
777         return 0;
778
779 }
780
781 static int
782 proc_read_lcd(char *page, char **start, off_t off, int count, int *eof,
783               void *data)
784 {
785         return sprintf(page, "%d\n", get_lcd_state());
786 }
787
788 static int
789 proc_write_lcd(struct file *file, const char __user * buffer,
790                unsigned long count, void *data)
791 {
792         int rv, value;
793
794         rv = parse_arg(buffer, count, &value);
795         if (rv > 0)
796                 set_lcd_state(value);
797         return rv;
798 }
799
800 static int read_brightness(struct backlight_device *bd)
801 {
802         int value;
803
804         if (hotk->methods->brightness_get) {    /* SPLV/GPLV laptop */
805                 if (!read_acpi_int(hotk->handle, hotk->methods->brightness_get,
806                                    &value))
807                         printk(KERN_WARNING
808                                "Asus ACPI: Error reading brightness\n");
809         } else if (hotk->methods->brightness_status) {  /* For D1 for example */
810                 if (!read_acpi_int(NULL, hotk->methods->brightness_status,
811                                    &value))
812                         printk(KERN_WARNING
813                                "Asus ACPI: Error reading brightness\n");
814         } else                  /* No GPLV method */
815                 value = hotk->brightness;
816         return value;
817 }
818
819 /*
820  * Change the brightness level
821  */
822 static int set_brightness(int value)
823 {
824         acpi_status status = 0;
825         int ret = 0;
826
827         /* SPLV laptop */
828         if (hotk->methods->brightness_set) {
829                 if (!write_acpi_int(hotk->handle, hotk->methods->brightness_set,
830                                     value, NULL))
831                         printk(KERN_WARNING
832                                "Asus ACPI: Error changing brightness\n");
833                         ret = -EIO;
834                 goto out;
835         }
836
837         /* No SPLV method if we are here, act as appropriate */
838         value -= read_brightness(NULL);
839         while (value != 0) {
840                 status = acpi_evaluate_object(NULL, (value > 0) ?
841                                               hotk->methods->brightness_up :
842                                               hotk->methods->brightness_down,
843                                               NULL, NULL);
844                 (value > 0) ? value-- : value++;
845                 if (ACPI_FAILURE(status))
846                         printk(KERN_WARNING
847                                "Asus ACPI: Error changing brightness\n");
848                         ret = -EIO;
849         }
850 out:
851         return ret;
852 }
853
854 static int set_brightness_status(struct backlight_device *bd)
855 {
856         return set_brightness(bd->props.brightness);
857 }
858
859 static int
860 proc_read_brn(char *page, char **start, off_t off, int count, int *eof,
861               void *data)
862 {
863         return sprintf(page, "%d\n", read_brightness(NULL));
864 }
865
866 static int
867 proc_write_brn(struct file *file, const char __user * buffer,
868                unsigned long count, void *data)
869 {
870         int rv, value;
871
872         rv = parse_arg(buffer, count, &value);
873         if (rv > 0) {
874                 value = (0 < value) ? ((15 < value) ? 15 : value) : 0;
875                 /* 0 <= value <= 15 */
876                 set_brightness(value);
877         }
878         return rv;
879 }
880
881 static void set_display(int value)
882 {
883         /* no sanity check needed for now */
884         if (!write_acpi_int(hotk->handle, hotk->methods->display_set,
885                             value, NULL))
886                 printk(KERN_WARNING "Asus ACPI: Error setting display\n");
887         return;
888 }
889
890 /*
891  * Now, *this* one could be more user-friendly, but so far, no-one has 
892  * complained. The significance of bits is the same as in proc_write_disp()
893  */
894 static int
895 proc_read_disp(char *page, char **start, off_t off, int count, int *eof,
896                void *data)
897 {
898         int value = 0;
899
900         if (!read_acpi_int(hotk->handle, hotk->methods->display_get, &value))
901                 printk(KERN_WARNING
902                        "Asus ACPI: Error reading display status\n");
903         value &= 0x07;          /* needed for some models, shouldn't hurt others */
904         return sprintf(page, "%d\n", value);
905 }
906
907 /*
908  * Experimental support for display switching. As of now: 1 should activate 
909  * the LCD output, 2 should do for CRT, and 4 for TV-Out. Any combination 
910  * (bitwise) of these will suffice. I never actually tested 3 displays hooked up 
911  * simultaneously, so be warned. See the acpi4asus README for more info.
912  */
913 static int
914 proc_write_disp(struct file *file, const char __user * buffer,
915                 unsigned long count, void *data)
916 {
917         int rv, value;
918
919         rv = parse_arg(buffer, count, &value);
920         if (rv > 0)
921                 set_display(value);
922         return rv;
923 }
924
925 typedef int (proc_readfunc) (char *page, char **start, off_t off, int count,
926                              int *eof, void *data);
927 typedef int (proc_writefunc) (struct file * file, const char __user * buffer,
928                               unsigned long count, void *data);
929
930 static int
931 asus_proc_add(char *name, proc_writefunc * writefunc,
932                      proc_readfunc * readfunc, mode_t mode,
933                      struct acpi_device *device)
934 {
935         struct proc_dir_entry *proc =
936             create_proc_entry(name, mode, acpi_device_dir(device));
937         if (!proc) {
938                 printk(KERN_WARNING "  Unable to create %s fs entry\n", name);
939                 return -1;
940         }
941         proc->write_proc = writefunc;
942         proc->read_proc = readfunc;
943         proc->data = acpi_driver_data(device);
944         proc->owner = THIS_MODULE;
945         proc->uid = asus_uid;
946         proc->gid = asus_gid;
947         return 0;
948 }
949
950 static int asus_hotk_add_fs(struct acpi_device *device)
951 {
952         struct proc_dir_entry *proc;
953         mode_t mode;
954
955         /*
956          * If parameter uid or gid is not changed, keep the default setting for
957          * our proc entries (-rw-rw-rw-) else, it means we care about security,
958          * and then set to -rw-rw----
959          */
960
961         if ((asus_uid == 0) && (asus_gid == 0)) {
962                 mode = S_IFREG | S_IRUGO | S_IWUGO;
963         } else {
964                 mode = S_IFREG | S_IRUSR | S_IRGRP | S_IWUSR | S_IWGRP;
965                 printk(KERN_WARNING "  asus_uid and asus_gid parameters are "
966                        "deprecated, use chown and chmod instead!\n");
967         }
968
969         acpi_device_dir(device) = asus_proc_dir;
970         if (!acpi_device_dir(device))
971                 return -ENODEV;
972
973         proc = create_proc_entry(PROC_INFO, mode, acpi_device_dir(device));
974         if (proc) {
975                 proc->read_proc = proc_read_info;
976                 proc->data = acpi_driver_data(device);
977                 proc->owner = THIS_MODULE;
978                 proc->uid = asus_uid;
979                 proc->gid = asus_gid;
980         } else {
981                 printk(KERN_WARNING "  Unable to create " PROC_INFO
982                        " fs entry\n");
983         }
984
985         if (hotk->methods->mt_wled) {
986                 asus_proc_add(PROC_WLED, &proc_write_wled, &proc_read_wled,
987                               mode, device);
988         }
989
990         if (hotk->methods->mt_ledd) {
991                 asus_proc_add(PROC_LEDD, &proc_write_ledd, &proc_read_ledd,
992                               mode, device);
993         }
994
995         if (hotk->methods->mt_mled) {
996                 asus_proc_add(PROC_MLED, &proc_write_mled, &proc_read_mled,
997                               mode, device);
998         }
999
1000         if (hotk->methods->mt_tled) {
1001                 asus_proc_add(PROC_TLED, &proc_write_tled, &proc_read_tled,
1002                               mode, device);
1003         }
1004
1005         if (hotk->methods->mt_bt_switch) {
1006                 asus_proc_add(PROC_BT, &proc_write_bluetooth,
1007                               &proc_read_bluetooth, mode, device);
1008         }
1009
1010         /* 
1011          * We need both read node and write method as LCD switch is also accessible
1012          * from keyboard 
1013          */
1014         if (hotk->methods->mt_lcd_switch && hotk->methods->lcd_status) {
1015                 asus_proc_add(PROC_LCD, &proc_write_lcd, &proc_read_lcd, mode,
1016                               device);
1017         }
1018
1019         if ((hotk->methods->brightness_up && hotk->methods->brightness_down) ||
1020             (hotk->methods->brightness_get && hotk->methods->brightness_set)) {
1021                 asus_proc_add(PROC_BRN, &proc_write_brn, &proc_read_brn, mode,
1022                               device);
1023         }
1024
1025         if (hotk->methods->display_set) {
1026                 asus_proc_add(PROC_DISP, &proc_write_disp, &proc_read_disp,
1027                               mode, device);
1028         }
1029
1030         return 0;
1031 }
1032
1033 static int asus_hotk_remove_fs(struct acpi_device *device)
1034 {
1035         if (acpi_device_dir(device)) {
1036                 remove_proc_entry(PROC_INFO, acpi_device_dir(device));
1037                 if (hotk->methods->mt_wled)
1038                         remove_proc_entry(PROC_WLED, acpi_device_dir(device));
1039                 if (hotk->methods->mt_mled)
1040                         remove_proc_entry(PROC_MLED, acpi_device_dir(device));
1041                 if (hotk->methods->mt_tled)
1042                         remove_proc_entry(PROC_TLED, acpi_device_dir(device));
1043                 if (hotk->methods->mt_ledd)
1044                         remove_proc_entry(PROC_LEDD, acpi_device_dir(device));
1045                 if (hotk->methods->mt_bt_switch)
1046                         remove_proc_entry(PROC_BT, acpi_device_dir(device));
1047                 if (hotk->methods->mt_lcd_switch && hotk->methods->lcd_status)
1048                         remove_proc_entry(PROC_LCD, acpi_device_dir(device));
1049                 if ((hotk->methods->brightness_up
1050                      && hotk->methods->brightness_down)
1051                     || (hotk->methods->brightness_get
1052                         && hotk->methods->brightness_set))
1053                         remove_proc_entry(PROC_BRN, acpi_device_dir(device));
1054                 if (hotk->methods->display_set)
1055                         remove_proc_entry(PROC_DISP, acpi_device_dir(device));
1056         }
1057         return 0;
1058 }
1059
1060 static void asus_hotk_notify(acpi_handle handle, u32 event, void *data)
1061 {
1062         /* TODO Find a better way to handle events count. */
1063         if (!hotk)
1064                 return;
1065
1066         if ((event & ~((u32) BR_UP)) < 16) {
1067                 hotk->brightness = (event & ~((u32) BR_UP));
1068         } else if ((event & ~((u32) BR_DOWN)) < 16) {
1069                 hotk->brightness = (event & ~((u32) BR_DOWN));
1070         }
1071
1072         acpi_bus_generate_proc_event(hotk->device, event,
1073                                 hotk->event_count[event % 128]++);
1074
1075         return;
1076 }
1077
1078 /*
1079  * Match the model string to the list of supported models. Return END_MODEL if
1080  * no match or model is NULL.
1081  */
1082 static int asus_model_match(char *model)
1083 {
1084         if (model == NULL)
1085                 return END_MODEL;
1086
1087         if (strncmp(model, "L3D", 3) == 0)
1088                 return L3D;
1089         else if (strncmp(model, "L2E", 3) == 0 ||
1090                  strncmp(model, "L3H", 3) == 0 || strncmp(model, "L5D", 3) == 0)
1091                 return L3H;
1092         else if (strncmp(model, "L3", 2) == 0 || strncmp(model, "L2B", 3) == 0)
1093                 return L3C;
1094         else if (strncmp(model, "L8L", 3) == 0)
1095                 return L8L;
1096         else if (strncmp(model, "L4R", 3) == 0)
1097                 return L4R;
1098         else if (strncmp(model, "M6N", 3) == 0 || strncmp(model, "W3N", 3) == 0)
1099                 return M6N;
1100         else if (strncmp(model, "M6R", 3) == 0 || strncmp(model, "A3G", 3) == 0)
1101                 return M6R;
1102         else if (strncmp(model, "M2N", 3) == 0 ||
1103                  strncmp(model, "M3N", 3) == 0 ||
1104                  strncmp(model, "M5N", 3) == 0 ||
1105                  strncmp(model, "M6N", 3) == 0 ||
1106                  strncmp(model, "S1N", 3) == 0 ||
1107                  strncmp(model, "S5N", 3) == 0 || strncmp(model, "W1N", 3) == 0)
1108                 return xxN;
1109         else if (strncmp(model, "M1", 2) == 0)
1110                 return M1A;
1111         else if (strncmp(model, "M2", 2) == 0 || strncmp(model, "L4E", 3) == 0)
1112                 return M2E;
1113         else if (strncmp(model, "L2", 2) == 0)
1114                 return L2D;
1115         else if (strncmp(model, "L8", 2) == 0)
1116                 return S1x;
1117         else if (strncmp(model, "D1", 2) == 0)
1118                 return D1x;
1119         else if (strncmp(model, "A1", 2) == 0)
1120                 return A1x;
1121         else if (strncmp(model, "A2", 2) == 0)
1122                 return A2x;
1123         else if (strncmp(model, "J1", 2) == 0)
1124                 return S2x;
1125         else if (strncmp(model, "L5", 2) == 0)
1126                 return L5x;
1127         else if (strncmp(model, "A4G", 3) == 0)
1128                 return A4G;
1129         else if (strncmp(model, "W1N", 3) == 0)
1130                 return W1N;
1131         else if (strncmp(model, "W3V", 3) == 0)
1132                 return W3V;
1133         else if (strncmp(model, "W5A", 3) == 0)
1134                 return W5A;
1135         else if (strncmp(model, "A4S", 3) == 0)
1136                 return A4S;
1137         else
1138                 return END_MODEL;
1139 }
1140
1141 /*
1142  * This function is used to initialize the hotk with right values. In this
1143  * method, we can make all the detection we want, and modify the hotk struct
1144  */
1145 static int asus_hotk_get_info(void)
1146 {
1147         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1148         union acpi_object *model = NULL;
1149         int bsts_result;
1150         char *string = NULL;
1151         acpi_status status;
1152
1153         /*
1154          * Get DSDT headers early enough to allow for differentiating between 
1155          * models, but late enough to allow acpi_bus_register_driver() to fail 
1156          * before doing anything ACPI-specific. Should we encounter a machine,
1157          * which needs special handling (i.e. its hotkey device has a different
1158          * HID), this bit will be moved. A global variable asus_info contains
1159          * the DSDT header.
1160          */
1161         status = acpi_get_table(ACPI_SIG_DSDT, 1, &asus_info);
1162         if (ACPI_FAILURE(status))
1163                 printk(KERN_WARNING "  Couldn't get the DSDT table header\n");
1164
1165         /* We have to write 0 on init this far for all ASUS models */
1166         if (!write_acpi_int(hotk->handle, "INIT", 0, &buffer)) {
1167                 printk(KERN_ERR "  Hotkey initialization failed\n");
1168                 return -ENODEV;
1169         }
1170
1171         /* This needs to be called for some laptops to init properly */
1172         if (!read_acpi_int(hotk->handle, "BSTS", &bsts_result))
1173                 printk(KERN_WARNING "  Error calling BSTS\n");
1174         else if (bsts_result)
1175                 printk(KERN_NOTICE "  BSTS called, 0x%02x returned\n",
1176                        bsts_result);
1177
1178         /*
1179          * Try to match the object returned by INIT to the specific model.
1180          * Handle every possible object (or the lack of thereof) the DSDT 
1181          * writers might throw at us. When in trouble, we pass NULL to 
1182          * asus_model_match() and try something completely different.
1183          */
1184         if (buffer.pointer) {
1185                 model = buffer.pointer;
1186                 switch (model->type) {
1187                 case ACPI_TYPE_STRING:
1188                         string = model->string.pointer;
1189                         break;
1190                 case ACPI_TYPE_BUFFER:
1191                         string = model->buffer.pointer;
1192                         break;
1193                 default:
1194                         kfree(model);
1195                         model = NULL;
1196                         break;
1197                 }
1198         }
1199         hotk->model = asus_model_match(string);
1200         if (hotk->model == END_MODEL) { /* match failed */
1201                 if (asus_info &&
1202                     strncmp(asus_info->oem_table_id, "ODEM", 4) == 0) {
1203                         hotk->model = P30;
1204                         printk(KERN_NOTICE
1205                                "  Samsung P30 detected, supported\n");
1206                 } else {
1207                         hotk->model = M2E;
1208                         printk(KERN_NOTICE "  unsupported model %s, trying "
1209                                "default values\n", string);
1210                         printk(KERN_NOTICE
1211                                "  send /proc/acpi/dsdt to the developers\n");
1212                 }
1213                 hotk->methods = &model_conf[hotk->model];
1214                 return AE_OK;
1215         }
1216         hotk->methods = &model_conf[hotk->model];
1217         printk(KERN_NOTICE "  %s model detected, supported\n", string);
1218
1219         /* Sort of per-model blacklist */
1220         if (strncmp(string, "L2B", 3) == 0)
1221                 hotk->methods->lcd_status = NULL;
1222         /* L2B is similar enough to L3C to use its settings, with this only 
1223            exception */
1224         else if (strncmp(string, "A3G", 3) == 0)
1225                 hotk->methods->lcd_status = "\\BLFG";
1226         /* A3G is like M6R */
1227         else if (strncmp(string, "S5N", 3) == 0 ||
1228                  strncmp(string, "M5N", 3) == 0 ||
1229                  strncmp(string, "W3N", 3) == 0)
1230                 hotk->methods->mt_mled = NULL;
1231         /* S5N, M5N and W3N have no MLED */
1232         else if (strncmp(string, "L5D", 3) == 0)
1233                 hotk->methods->mt_wled = NULL;
1234         /* L5D's WLED is not controlled by ACPI */
1235         else if (strncmp(string, "M2N", 3) == 0 ||
1236                  strncmp(string, "W3V", 3) == 0 ||
1237                  strncmp(string, "S1N", 3) == 0)
1238                 hotk->methods->mt_wled = "WLED";
1239         /* M2N, S1N and W3V have a usable WLED */
1240         else if (asus_info) {
1241                 if (strncmp(asus_info->oem_table_id, "L1", 2) == 0)
1242                         hotk->methods->mled_status = NULL;
1243                 /* S1300A reports L84F, but L1400B too, account for that */
1244         }
1245
1246         kfree(model);
1247
1248         return AE_OK;
1249 }
1250
1251 static int asus_hotk_check(void)
1252 {
1253         int result = 0;
1254
1255         result = acpi_bus_get_status(hotk->device);
1256         if (result)
1257                 return result;
1258
1259         if (hotk->device->status.present) {
1260                 result = asus_hotk_get_info();
1261         } else {
1262                 printk(KERN_ERR "  Hotkey device not present, aborting\n");
1263                 return -EINVAL;
1264         }
1265
1266         return result;
1267 }
1268
1269 static int asus_hotk_found;
1270
1271 static int asus_hotk_add(struct acpi_device *device)
1272 {
1273         acpi_status status = AE_OK;
1274         int result;
1275
1276         if (!device)
1277                 return -EINVAL;
1278
1279         printk(KERN_NOTICE "Asus Laptop ACPI Extras version %s\n",
1280                ASUS_ACPI_VERSION);
1281
1282         hotk = kzalloc(sizeof(struct asus_hotk), GFP_KERNEL);
1283         if (!hotk)
1284                 return -ENOMEM;
1285
1286         hotk->handle = device->handle;
1287         strcpy(acpi_device_name(device), ACPI_HOTK_DEVICE_NAME);
1288         strcpy(acpi_device_class(device), ACPI_HOTK_CLASS);
1289         acpi_driver_data(device) = hotk;
1290         hotk->device = device;
1291
1292         result = asus_hotk_check();
1293         if (result)
1294                 goto end;
1295
1296         result = asus_hotk_add_fs(device);
1297         if (result)
1298                 goto end;
1299
1300         /*
1301          * We install the handler, it will receive the hotk in parameter, so, we
1302          * could add other data to the hotk struct
1303          */
1304         status = acpi_install_notify_handler(hotk->handle, ACPI_SYSTEM_NOTIFY,
1305                                              asus_hotk_notify, hotk);
1306         if (ACPI_FAILURE(status))
1307                 printk(KERN_ERR "  Error installing notify handler\n");
1308
1309         /* For laptops without GPLV: init the hotk->brightness value */
1310         if ((!hotk->methods->brightness_get)
1311             && (!hotk->methods->brightness_status)
1312             && (hotk->methods->brightness_up && hotk->methods->brightness_down)) {
1313                 status =
1314                     acpi_evaluate_object(NULL, hotk->methods->brightness_down,
1315                                          NULL, NULL);
1316                 if (ACPI_FAILURE(status))
1317                         printk(KERN_WARNING "  Error changing brightness\n");
1318                 else {
1319                         status =
1320                             acpi_evaluate_object(NULL,
1321                                                  hotk->methods->brightness_up,
1322                                                  NULL, NULL);
1323                         if (ACPI_FAILURE(status))
1324                                 printk(KERN_WARNING "  Strange, error changing"
1325                                        " brightness\n");
1326                 }
1327         }
1328
1329         asus_hotk_found = 1;
1330
1331         /* LED display is off by default */
1332         hotk->ledd_status = 0xFFF;
1333
1334       end:
1335         if (result) {
1336                 kfree(hotk);
1337         }
1338
1339         return result;
1340 }
1341
1342 static int asus_hotk_remove(struct acpi_device *device, int type)
1343 {
1344         acpi_status status = 0;
1345
1346         if (!device || !acpi_driver_data(device))
1347                 return -EINVAL;
1348
1349         status = acpi_remove_notify_handler(hotk->handle, ACPI_SYSTEM_NOTIFY,
1350                                             asus_hotk_notify);
1351         if (ACPI_FAILURE(status))
1352                 printk(KERN_ERR "Asus ACPI: Error removing notify handler\n");
1353
1354         asus_hotk_remove_fs(device);
1355
1356         kfree(hotk);
1357
1358         return 0;
1359 }
1360
1361 static struct backlight_ops asus_backlight_data = {
1362         .get_brightness = read_brightness,
1363         .update_status  = set_brightness_status,
1364 };
1365
1366 static void asus_acpi_exit(void)
1367 {
1368         if (asus_backlight_device)
1369                 backlight_device_unregister(asus_backlight_device);
1370
1371         acpi_bus_unregister_driver(&asus_hotk_driver);
1372         remove_proc_entry(PROC_ASUS, acpi_root_dir);
1373
1374         return;
1375 }
1376
1377 static int __init asus_acpi_init(void)
1378 {
1379         int result;
1380
1381         if (acpi_disabled)
1382                 return -ENODEV;
1383
1384         asus_proc_dir = proc_mkdir(PROC_ASUS, acpi_root_dir);
1385         if (!asus_proc_dir) {
1386                 printk(KERN_ERR "Asus ACPI: Unable to create /proc entry\n");
1387                 return -ENODEV;
1388         }
1389         asus_proc_dir->owner = THIS_MODULE;
1390
1391         result = acpi_bus_register_driver(&asus_hotk_driver);
1392         if (result < 0) {
1393                 remove_proc_entry(PROC_ASUS, acpi_root_dir);
1394                 return result;
1395         }
1396
1397         /*
1398          * This is a bit of a kludge.  We only want this module loaded
1399          * for ASUS systems, but there's currently no way to probe the
1400          * ACPI namespace for ASUS HIDs.  So we just return failure if
1401          * we didn't find one, which will cause the module to be
1402          * unloaded.
1403          */
1404         if (!asus_hotk_found) {
1405                 acpi_bus_unregister_driver(&asus_hotk_driver);
1406                 remove_proc_entry(PROC_ASUS, acpi_root_dir);
1407                 return -ENODEV;
1408         }
1409
1410         asus_backlight_device = backlight_device_register("asus",NULL,NULL,
1411                                                           &asus_backlight_data);
1412         if (IS_ERR(asus_backlight_device)) {
1413                 printk(KERN_ERR "Could not register asus backlight device\n");
1414                 asus_backlight_device = NULL;
1415                 asus_acpi_exit();
1416                 return -ENODEV;
1417         }
1418         asus_backlight_device->props.max_brightness = 15;
1419
1420         return 0;
1421 }
1422
1423 module_init(asus_acpi_init);
1424 module_exit(asus_acpi_exit);