Merge git://git.infradead.org/mtd-2.6
[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 #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                 A4S,            //Z81sp
145                 //(Centrino)
146                 END_MODEL
147         } model;                //Models currently supported
148         u16 event_count[128];   //count for each event TODO make this better
149 };
150
151 /* Here we go */
152 #define A1x_PREFIX "\\_SB.PCI0.ISA.EC0."
153 #define L3C_PREFIX "\\_SB.PCI0.PX40.ECD0."
154 #define M1A_PREFIX "\\_SB.PCI0.PX40.EC0."
155 #define P30_PREFIX "\\_SB.PCI0.LPCB.EC0."
156 #define S1x_PREFIX "\\_SB.PCI0.PX40."
157 #define S2x_PREFIX A1x_PREFIX
158 #define xxN_PREFIX "\\_SB.PCI0.SBRG.EC0."
159
160 static struct model_data model_conf[END_MODEL] = {
161         /*
162          * TODO I have seen a SWBX and AIBX method on some models, like L1400B,
163          * it seems to be a kind of switch, but what for ?
164          */
165
166         {
167          .name = "A1x",
168          .mt_mled = "MLED",
169          .mled_status = "\\MAIL",
170          .mt_lcd_switch = A1x_PREFIX "_Q10",
171          .lcd_status = "\\BKLI",
172          .brightness_up = A1x_PREFIX "_Q0E",
173          .brightness_down = A1x_PREFIX "_Q0F"},
174
175         {
176          .name = "A2x",
177          .mt_mled = "MLED",
178          .mt_wled = "WLED",
179          .wled_status = "\\SG66",
180          .mt_lcd_switch = "\\Q10",
181          .lcd_status = "\\BAOF",
182          .brightness_set = "SPLV",
183          .brightness_get = "GPLV",
184          .display_set = "SDSP",
185          .display_get = "\\INFB"},
186
187         {
188          .name = "A4G",
189          .mt_mled = "MLED",
190 /* WLED present, but not controlled by ACPI */
191          .mt_lcd_switch = xxN_PREFIX "_Q10",
192          .brightness_set = "SPLV",
193          .brightness_get = "GPLV",
194          .display_set = "SDSP",
195          .display_get = "\\ADVG"},
196
197         {
198          .name = "D1x",
199          .mt_mled = "MLED",
200          .mt_lcd_switch = "\\Q0D",
201          .lcd_status = "\\GP11",
202          .brightness_up = "\\Q0C",
203          .brightness_down = "\\Q0B",
204          .brightness_status = "\\BLVL",
205          .display_set = "SDSP",
206          .display_get = "\\INFB"},
207
208         {
209          .name = "L2D",
210          .mt_mled = "MLED",
211          .mled_status = "\\SGP6",
212          .mt_wled = "WLED",
213          .wled_status = "\\RCP3",
214          .mt_lcd_switch = "\\Q10",
215          .lcd_status = "\\SGP0",
216          .brightness_up = "\\Q0E",
217          .brightness_down = "\\Q0F",
218          .display_set = "SDSP",
219          .display_get = "\\INFB"},
220
221         {
222          .name = "L3C",
223          .mt_mled = "MLED",
224          .mt_wled = "WLED",
225          .mt_lcd_switch = L3C_PREFIX "_Q10",
226          .lcd_status = "\\GL32",
227          .brightness_set = "SPLV",
228          .brightness_get = "GPLV",
229          .display_set = "SDSP",
230          .display_get = "\\_SB.PCI0.PCI1.VGAC.NMAP"},
231
232         {
233          .name = "L3D",
234          .mt_mled = "MLED",
235          .mled_status = "\\MALD",
236          .mt_wled = "WLED",
237          .mt_lcd_switch = "\\Q10",
238          .lcd_status = "\\BKLG",
239          .brightness_set = "SPLV",
240          .brightness_get = "GPLV",
241          .display_set = "SDSP",
242          .display_get = "\\INFB"},
243
244         {
245          .name = "L3H",
246          .mt_mled = "MLED",
247          .mt_wled = "WLED",
248          .mt_lcd_switch = "EHK",
249          .lcd_status = "\\_SB.PCI0.PM.PBC",
250          .brightness_set = "SPLV",
251          .brightness_get = "GPLV",
252          .display_set = "SDSP",
253          .display_get = "\\INFB"},
254
255         {
256          .name = "L4R",
257          .mt_mled = "MLED",
258          .mt_wled = "WLED",
259          .wled_status = "\\_SB.PCI0.SBRG.SG13",
260          .mt_lcd_switch = xxN_PREFIX "_Q10",
261          .lcd_status = "\\_SB.PCI0.SBSM.SEO4",
262          .brightness_set = "SPLV",
263          .brightness_get = "GPLV",
264          .display_set = "SDSP",
265          .display_get = "\\_SB.PCI0.P0P1.VGA.GETD"},
266
267         {
268          .name = "L5x",
269          .mt_mled = "MLED",
270 /* WLED present, but not controlled by ACPI */
271          .mt_tled = "TLED",
272          .mt_lcd_switch = "\\Q0D",
273          .lcd_status = "\\BAOF",
274          .brightness_set = "SPLV",
275          .brightness_get = "GPLV",
276          .display_set = "SDSP",
277          .display_get = "\\INFB"},
278
279         {
280          .name = "L8L"
281 /* No features, but at least support the hotkeys */
282          },
283
284         {
285          .name = "M1A",
286          .mt_mled = "MLED",
287          .mt_lcd_switch = M1A_PREFIX "Q10",
288          .lcd_status = "\\PNOF",
289          .brightness_up = M1A_PREFIX "Q0E",
290          .brightness_down = M1A_PREFIX "Q0F",
291          .brightness_status = "\\BRIT",
292          .display_set = "SDSP",
293          .display_get = "\\INFB"},
294
295         {
296          .name = "M2E",
297          .mt_mled = "MLED",
298          .mt_wled = "WLED",
299          .mt_lcd_switch = "\\Q10",
300          .lcd_status = "\\GP06",
301          .brightness_set = "SPLV",
302          .brightness_get = "GPLV",
303          .display_set = "SDSP",
304          .display_get = "\\INFB"},
305
306         {
307          .name = "M6N",
308          .mt_mled = "MLED",
309          .mt_wled = "WLED",
310          .wled_status = "\\_SB.PCI0.SBRG.SG13",
311          .mt_lcd_switch = xxN_PREFIX "_Q10",
312          .lcd_status = "\\_SB.BKLT",
313          .brightness_set = "SPLV",
314          .brightness_get = "GPLV",
315          .display_set = "SDSP",
316          .display_get = "\\SSTE"},
317
318         {
319          .name = "M6R",
320          .mt_mled = "MLED",
321          .mt_wled = "WLED",
322          .mt_lcd_switch = xxN_PREFIX "_Q10",
323          .lcd_status = "\\_SB.PCI0.SBSM.SEO4",
324          .brightness_set = "SPLV",
325          .brightness_get = "GPLV",
326          .display_set = "SDSP",
327          .display_get = "\\_SB.PCI0.P0P1.VGA.GETD"},
328
329         {
330          .name = "P30",
331          .mt_wled = "WLED",
332          .mt_lcd_switch = P30_PREFIX "_Q0E",
333          .lcd_status = "\\BKLT",
334          .brightness_up = P30_PREFIX "_Q68",
335          .brightness_down = P30_PREFIX "_Q69",
336          .brightness_get = "GPLV",
337          .display_set = "SDSP",
338          .display_get = "\\DNXT"},
339
340         {
341          .name = "S1x",
342          .mt_mled = "MLED",
343          .mled_status = "\\EMLE",
344          .mt_wled = "WLED",
345          .mt_lcd_switch = S1x_PREFIX "Q10",
346          .lcd_status = "\\PNOF",
347          .brightness_set = "SPLV",
348          .brightness_get = "GPLV"},
349
350         {
351          .name = "S2x",
352          .mt_mled = "MLED",
353          .mled_status = "\\MAIL",
354          .mt_lcd_switch = S2x_PREFIX "_Q10",
355          .lcd_status = "\\BKLI",
356          .brightness_up = S2x_PREFIX "_Q0B",
357          .brightness_down = S2x_PREFIX "_Q0A"},
358
359         {
360          .name = "W1N",
361          .mt_mled = "MLED",
362          .mt_wled = "WLED",
363          .mt_ledd = "SLCM",
364          .mt_lcd_switch = xxN_PREFIX "_Q10",
365          .lcd_status = "\\BKLT",
366          .brightness_set = "SPLV",
367          .brightness_get = "GPLV",
368          .display_set = "SDSP",
369          .display_get = "\\ADVG"},
370
371         {
372          .name = "W5A",
373          .mt_bt_switch = "BLED",
374          .mt_wled = "WLED",
375          .mt_lcd_switch = xxN_PREFIX "_Q10",
376          .brightness_set = "SPLV",
377          .brightness_get = "GPLV",
378          .display_set = "SDSP",
379          .display_get = "\\ADVG"},
380
381         {
382          .name = "W3V",
383          .mt_mled = "MLED",
384          .mt_wled = "WLED",
385          .mt_lcd_switch = xxN_PREFIX "_Q10",
386          .lcd_status = "\\BKLT",
387          .brightness_set = "SPLV",
388          .brightness_get = "GPLV",
389          .display_set = "SDSP",
390          .display_get = "\\INFB"},
391
392        {
393          .name = "xxN",
394          .mt_mled = "MLED",
395 /* WLED present, but not controlled by ACPI */
396          .mt_lcd_switch = xxN_PREFIX "_Q10",
397          .lcd_status = "\\BKLT",
398          .brightness_set = "SPLV",
399          .brightness_get = "GPLV",
400          .display_set = "SDSP",
401         .display_get = "\\ADVG"},
402
403         {
404                 .name              = "A4S",
405                 .brightness_set    = "SPLV",
406                 .brightness_get    = "GPLV",
407                 .mt_bt_switch      = "BLED",
408                 .mt_wled           = "WLED"
409         }
410
411 };
412
413 /* procdir we use */
414 static struct proc_dir_entry *asus_proc_dir;
415
416 static struct backlight_device *asus_backlight_device;
417
418 /*
419  * This header is made available to allow proper configuration given model,
420  * revision number , ... this info cannot go in struct asus_hotk because it is
421  * available before the hotk
422  */
423 static struct acpi_table_header *asus_info;
424
425 /* The actual device the driver binds to */
426 static struct asus_hotk *hotk;
427
428 /*
429  * The hotkey driver declaration
430  */
431 static int asus_hotk_add(struct acpi_device *device);
432 static int asus_hotk_remove(struct acpi_device *device, int type);
433 static struct acpi_driver asus_hotk_driver = {
434         .name = "asus_acpi",
435         .class = ACPI_HOTK_CLASS,
436         .ids = ACPI_HOTK_HID,
437         .ops = {
438                 .add = asus_hotk_add,
439                 .remove = asus_hotk_remove,
440                 },
441 };
442
443 /* 
444  * This function evaluates an ACPI method, given an int as parameter, the
445  * method is searched within the scope of the handle, can be NULL. The output
446  * of the method is written is output, which can also be NULL
447  *
448  * returns 1 if write is successful, 0 else. 
449  */
450 static int write_acpi_int(acpi_handle handle, const char *method, int val,
451                           struct acpi_buffer *output)
452 {
453         struct acpi_object_list params; //list of input parameters (an int here)
454         union acpi_object in_obj;       //the only param we use
455         acpi_status status;
456
457         params.count = 1;
458         params.pointer = &in_obj;
459         in_obj.type = ACPI_TYPE_INTEGER;
460         in_obj.integer.value = val;
461
462         status = acpi_evaluate_object(handle, (char *)method, &params, output);
463         return (status == AE_OK);
464 }
465
466 static int read_acpi_int(acpi_handle handle, const char *method, int *val)
467 {
468         struct acpi_buffer output;
469         union acpi_object out_obj;
470         acpi_status status;
471
472         output.length = sizeof(out_obj);
473         output.pointer = &out_obj;
474
475         status = acpi_evaluate_object(handle, (char *)method, NULL, &output);
476         *val = out_obj.integer.value;
477         return (status == AE_OK) && (out_obj.type == ACPI_TYPE_INTEGER);
478 }
479
480 /*
481  * We write our info in page, we begin at offset off and cannot write more
482  * than count bytes. We set eof to 1 if we handle those 2 values. We return the
483  * number of bytes written in page
484  */
485 static int
486 proc_read_info(char *page, char **start, off_t off, int count, int *eof,
487                void *data)
488 {
489         int len = 0;
490         int temp;
491         char buf[16];           //enough for all info
492         /*
493          * We use the easy way, we don't care of off and count, so we don't set eof
494          * to 1
495          */
496
497         len += sprintf(page, ACPI_HOTK_NAME " " ASUS_ACPI_VERSION "\n");
498         len += sprintf(page + len, "Model reference    : %s\n",
499                        hotk->methods->name);
500         /* 
501          * The SFUN method probably allows the original driver to get the list 
502          * of features supported by a given model. For now, 0x0100 or 0x0800 
503          * bit signifies that the laptop is equipped with a Wi-Fi MiniPCI card.
504          * The significance of others is yet to be found.
505          */
506         if (read_acpi_int(hotk->handle, "SFUN", &temp))
507                 len +=
508                     sprintf(page + len, "SFUN value         : 0x%04x\n", temp);
509         /*
510          * Another value for userspace: the ASYM method returns 0x02 for
511          * battery low and 0x04 for battery critical, its readings tend to be
512          * more accurate than those provided by _BST. 
513          * Note: since not all the laptops provide this method, errors are
514          * silently ignored.
515          */
516         if (read_acpi_int(hotk->handle, "ASYM", &temp))
517                 len +=
518                     sprintf(page + len, "ASYM value         : 0x%04x\n", temp);
519         if (asus_info) {
520                 snprintf(buf, 16, "%d", asus_info->length);
521                 len += sprintf(page + len, "DSDT length        : %s\n", buf);
522                 snprintf(buf, 16, "%d", asus_info->checksum);
523                 len += sprintf(page + len, "DSDT checksum      : %s\n", buf);
524                 snprintf(buf, 16, "%d", asus_info->revision);
525                 len += sprintf(page + len, "DSDT revision      : %s\n", buf);
526                 snprintf(buf, 7, "%s", asus_info->oem_id);
527                 len += sprintf(page + len, "OEM id             : %s\n", buf);
528                 snprintf(buf, 9, "%s", asus_info->oem_table_id);
529                 len += sprintf(page + len, "OEM table id       : %s\n", buf);
530                 snprintf(buf, 16, "%x", asus_info->oem_revision);
531                 len += sprintf(page + len, "OEM revision       : 0x%s\n", buf);
532                 snprintf(buf, 5, "%s", asus_info->asl_compiler_id);
533                 len += sprintf(page + len, "ASL comp vendor id : %s\n", buf);
534                 snprintf(buf, 16, "%x", asus_info->asl_compiler_revision);
535                 len += sprintf(page + len, "ASL comp revision  : 0x%s\n", buf);
536         }
537
538         return len;
539 }
540
541 /*
542  * /proc handlers
543  * We write our info in page, we begin at offset off and cannot write more
544  * than count bytes. We set eof to 1 if we handle those 2 values. We return the
545  * number of bytes written in page
546  */
547
548 /* Generic LED functions */
549 static int read_led(const char *ledname, int ledmask)
550 {
551         if (ledname) {
552                 int led_status;
553
554                 if (read_acpi_int(NULL, ledname, &led_status))
555                         return led_status;
556                 else
557                         printk(KERN_WARNING "Asus ACPI: Error reading LED "
558                                "status\n");
559         }
560         return (hotk->status & ledmask) ? 1 : 0;
561 }
562
563 static int parse_arg(const char __user * buf, unsigned long count, int *val)
564 {
565         char s[32];
566         if (!count)
567                 return 0;
568         if (count > 31)
569                 return -EINVAL;
570         if (copy_from_user(s, buf, count))
571                 return -EFAULT;
572         s[count] = 0;
573         if (sscanf(s, "%i", val) != 1)
574                 return -EINVAL;
575         return count;
576 }
577
578 /* FIXME: kill extraneous args so it can be called independently */
579 static int
580 write_led(const char __user * buffer, unsigned long count,
581           char *ledname, int ledmask, int invert)
582 {
583         int rv, value;
584         int led_out = 0;
585
586         rv = parse_arg(buffer, count, &value);
587         if (rv > 0)
588                 led_out = value ? 1 : 0;
589
590         hotk->status =
591             (led_out) ? (hotk->status | ledmask) : (hotk->status & ~ledmask);
592
593         if (invert)             /* invert target value */
594                 led_out = !led_out & 0x1;
595
596         if (!write_acpi_int(hotk->handle, ledname, led_out, NULL))
597                 printk(KERN_WARNING "Asus ACPI: LED (%s) write failed\n",
598                        ledname);
599
600         return rv;
601 }
602
603 /*
604  * Proc handlers for MLED
605  */
606 static int
607 proc_read_mled(char *page, char **start, off_t off, int count, int *eof,
608                void *data)
609 {
610         return sprintf(page, "%d\n",
611                        read_led(hotk->methods->mled_status, MLED_ON));
612 }
613
614 static int
615 proc_write_mled(struct file *file, const char __user * buffer,
616                 unsigned long count, void *data)
617 {
618         return write_led(buffer, count, hotk->methods->mt_mled, MLED_ON, 1);
619 }
620
621 /*
622  * Proc handlers for LED display
623  */
624 static int
625 proc_read_ledd(char *page, char **start, off_t off, int count, int *eof,
626                void *data)
627 {
628         return sprintf(page, "0x%08x\n", hotk->ledd_status);
629 }
630
631 static int
632 proc_write_ledd(struct file *file, const char __user * buffer,
633                 unsigned long count, void *data)
634 {
635         int rv, value;
636
637         rv = parse_arg(buffer, count, &value);
638         if (rv > 0) {
639                 if (!write_acpi_int
640                     (hotk->handle, hotk->methods->mt_ledd, value, NULL))
641                         printk(KERN_WARNING
642                                "Asus ACPI: LED display write failed\n");
643                 else
644                         hotk->ledd_status = (u32) value;
645         }
646         return rv;
647 }
648
649 /*
650  * Proc handlers for WLED
651  */
652 static int
653 proc_read_wled(char *page, char **start, off_t off, int count, int *eof,
654                void *data)
655 {
656         return sprintf(page, "%d\n",
657                        read_led(hotk->methods->wled_status, WLED_ON));
658 }
659
660 static int
661 proc_write_wled(struct file *file, const char __user * buffer,
662                 unsigned long count, void *data)
663 {
664         return write_led(buffer, count, hotk->methods->mt_wled, WLED_ON, 0);
665 }
666
667 /*
668  * Proc handlers for Bluetooth
669  */
670 static int
671 proc_read_bluetooth(char *page, char **start, off_t off, int count, int *eof,
672                     void *data)
673 {
674         return sprintf(page, "%d\n", read_led(hotk->methods->bt_status, BT_ON));
675 }
676
677 static int
678 proc_write_bluetooth(struct file *file, const char __user * buffer,
679                      unsigned long count, void *data)
680 {
681         /* Note: mt_bt_switch controls both internal Bluetooth adapter's 
682            presence and its LED */
683         return write_led(buffer, count, hotk->methods->mt_bt_switch, BT_ON, 0);
684 }
685
686 /*
687  * Proc handlers for TLED
688  */
689 static int
690 proc_read_tled(char *page, char **start, off_t off, int count, int *eof,
691                void *data)
692 {
693         return sprintf(page, "%d\n",
694                        read_led(hotk->methods->tled_status, TLED_ON));
695 }
696
697 static int
698 proc_write_tled(struct file *file, const char __user * buffer,
699                 unsigned long count, void *data)
700 {
701         return write_led(buffer, count, hotk->methods->mt_tled, TLED_ON, 0);
702 }
703
704 static int get_lcd_state(void)
705 {
706         int lcd = 0;
707
708         if (hotk->model != L3H) {
709                 /* We don't have to check anything if we are here */
710                 if (!read_acpi_int(NULL, hotk->methods->lcd_status, &lcd))
711                         printk(KERN_WARNING
712                                "Asus ACPI: Error reading LCD status\n");
713
714                 if (hotk->model == L2D)
715                         lcd = ~lcd;
716         } else {                /* L3H and the like have to be handled differently */
717                 acpi_status status = 0;
718                 struct acpi_object_list input;
719                 union acpi_object mt_params[2];
720                 struct acpi_buffer output;
721                 union acpi_object out_obj;
722
723                 input.count = 2;
724                 input.pointer = mt_params;
725                 /* Note: the following values are partly guessed up, but 
726                    otherwise they seem to work */
727                 mt_params[0].type = ACPI_TYPE_INTEGER;
728                 mt_params[0].integer.value = 0x02;
729                 mt_params[1].type = ACPI_TYPE_INTEGER;
730                 mt_params[1].integer.value = 0x02;
731
732                 output.length = sizeof(out_obj);
733                 output.pointer = &out_obj;
734
735                 status =
736                     acpi_evaluate_object(NULL, hotk->methods->lcd_status,
737                                          &input, &output);
738                 if (status != AE_OK)
739                         return -1;
740                 if (out_obj.type == ACPI_TYPE_INTEGER)
741                         /* That's what the AML code does */
742                         lcd = out_obj.integer.value >> 8;
743         }
744
745         return (lcd & 1);
746 }
747
748 static int set_lcd_state(int value)
749 {
750         int lcd = 0;
751         acpi_status status = 0;
752
753         lcd = value ? 1 : 0;
754         if (lcd != get_lcd_state()) {
755                 /* switch */
756                 if (hotk->model != L3H) {
757                         status =
758                             acpi_evaluate_object(NULL,
759                                                  hotk->methods->mt_lcd_switch,
760                                                  NULL, NULL);
761                 } else {        /* L3H and the like have to be handled differently */
762                         if (!write_acpi_int
763                             (hotk->handle, hotk->methods->mt_lcd_switch, 0x07,
764                              NULL))
765                                 status = AE_ERROR;
766                         /* L3H's AML executes EHK (0x07) upon Fn+F7 keypress, 
767                            the exact behaviour is simulated here */
768                 }
769                 if (ACPI_FAILURE(status))
770                         printk(KERN_WARNING "Asus ACPI: Error switching LCD\n");
771         }
772         return 0;
773
774 }
775
776 static int
777 proc_read_lcd(char *page, char **start, off_t off, int count, int *eof,
778               void *data)
779 {
780         return sprintf(page, "%d\n", get_lcd_state());
781 }
782
783 static int
784 proc_write_lcd(struct file *file, const char __user * buffer,
785                unsigned long count, void *data)
786 {
787         int rv, value;
788
789         rv = parse_arg(buffer, count, &value);
790         if (rv > 0)
791                 set_lcd_state(value);
792         return rv;
793 }
794
795 static int read_brightness(struct backlight_device *bd)
796 {
797         int value;
798
799         if (hotk->methods->brightness_get) {    /* SPLV/GPLV laptop */
800                 if (!read_acpi_int(hotk->handle, hotk->methods->brightness_get,
801                                    &value))
802                         printk(KERN_WARNING
803                                "Asus ACPI: Error reading brightness\n");
804         } else if (hotk->methods->brightness_status) {  /* For D1 for example */
805                 if (!read_acpi_int(NULL, hotk->methods->brightness_status,
806                                    &value))
807                         printk(KERN_WARNING
808                                "Asus ACPI: Error reading brightness\n");
809         } else                  /* No GPLV method */
810                 value = hotk->brightness;
811         return value;
812 }
813
814 /*
815  * Change the brightness level
816  */
817 static int set_brightness(int value)
818 {
819         acpi_status status = 0;
820         int ret = 0;
821
822         /* SPLV laptop */
823         if (hotk->methods->brightness_set) {
824                 if (!write_acpi_int(hotk->handle, hotk->methods->brightness_set,
825                                     value, NULL))
826                         printk(KERN_WARNING
827                                "Asus ACPI: Error changing brightness\n");
828                         ret = -EIO;
829                 goto out;
830         }
831
832         /* No SPLV method if we are here, act as appropriate */
833         value -= read_brightness(NULL);
834         while (value != 0) {
835                 status = acpi_evaluate_object(NULL, (value > 0) ?
836                                               hotk->methods->brightness_up :
837                                               hotk->methods->brightness_down,
838                                               NULL, NULL);
839                 (value > 0) ? value-- : value++;
840                 if (ACPI_FAILURE(status))
841                         printk(KERN_WARNING
842                                "Asus ACPI: Error changing brightness\n");
843                         ret = -EIO;
844         }
845 out:
846         return ret;
847 }
848
849 static int set_brightness_status(struct backlight_device *bd)
850 {
851         return set_brightness(bd->props->brightness);
852 }
853
854 static int
855 proc_read_brn(char *page, char **start, off_t off, int count, int *eof,
856               void *data)
857 {
858         return sprintf(page, "%d\n", read_brightness(NULL));
859 }
860
861 static int
862 proc_write_brn(struct file *file, const char __user * buffer,
863                unsigned long count, void *data)
864 {
865         int rv, value;
866
867         rv = parse_arg(buffer, count, &value);
868         if (rv > 0) {
869                 value = (0 < value) ? ((15 < value) ? 15 : value) : 0;
870                 /* 0 <= value <= 15 */
871                 set_brightness(value);
872         }
873         return rv;
874 }
875
876 static void set_display(int value)
877 {
878         /* no sanity check needed for now */
879         if (!write_acpi_int(hotk->handle, hotk->methods->display_set,
880                             value, NULL))
881                 printk(KERN_WARNING "Asus ACPI: Error setting display\n");
882         return;
883 }
884
885 /*
886  * Now, *this* one could be more user-friendly, but so far, no-one has 
887  * complained. The significance of bits is the same as in proc_write_disp()
888  */
889 static int
890 proc_read_disp(char *page, char **start, off_t off, int count, int *eof,
891                void *data)
892 {
893         int value = 0;
894
895         if (!read_acpi_int(hotk->handle, hotk->methods->display_get, &value))
896                 printk(KERN_WARNING
897                        "Asus ACPI: Error reading display status\n");
898         value &= 0x07;          /* needed for some models, shouldn't hurt others */
899         return sprintf(page, "%d\n", value);
900 }
901
902 /*
903  * Experimental support for display switching. As of now: 1 should activate 
904  * the LCD output, 2 should do for CRT, and 4 for TV-Out. Any combination 
905  * (bitwise) of these will suffice. I never actually tested 3 displays hooked up 
906  * simultaneously, so be warned. See the acpi4asus README for more info.
907  */
908 static int
909 proc_write_disp(struct file *file, const char __user * buffer,
910                 unsigned long count, void *data)
911 {
912         int rv, value;
913
914         rv = parse_arg(buffer, count, &value);
915         if (rv > 0)
916                 set_display(value);
917         return rv;
918 }
919
920 typedef int (proc_readfunc) (char *page, char **start, off_t off, int count,
921                              int *eof, void *data);
922 typedef int (proc_writefunc) (struct file * file, const char __user * buffer,
923                               unsigned long count, void *data);
924
925 static int
926 asus_proc_add(char *name, proc_writefunc * writefunc,
927                      proc_readfunc * readfunc, mode_t mode,
928                      struct acpi_device *device)
929 {
930         struct proc_dir_entry *proc =
931             create_proc_entry(name, mode, acpi_device_dir(device));
932         if (!proc) {
933                 printk(KERN_WARNING "  Unable to create %s fs entry\n", name);
934                 return -1;
935         }
936         proc->write_proc = writefunc;
937         proc->read_proc = readfunc;
938         proc->data = acpi_driver_data(device);
939         proc->owner = THIS_MODULE;
940         proc->uid = asus_uid;
941         proc->gid = asus_gid;
942         return 0;
943 }
944
945 static int asus_hotk_add_fs(struct acpi_device *device)
946 {
947         struct proc_dir_entry *proc;
948         mode_t mode;
949
950         /*
951          * If parameter uid or gid is not changed, keep the default setting for
952          * our proc entries (-rw-rw-rw-) else, it means we care about security,
953          * and then set to -rw-rw----
954          */
955
956         if ((asus_uid == 0) && (asus_gid == 0)) {
957                 mode = S_IFREG | S_IRUGO | S_IWUGO;
958         } else {
959                 mode = S_IFREG | S_IRUSR | S_IRGRP | S_IWUSR | S_IWGRP;
960                 printk(KERN_WARNING "  asus_uid and asus_gid parameters are "
961                        "deprecated, use chown and chmod instead!\n");
962         }
963
964         acpi_device_dir(device) = asus_proc_dir;
965         if (!acpi_device_dir(device))
966                 return -ENODEV;
967
968         proc = create_proc_entry(PROC_INFO, mode, acpi_device_dir(device));
969         if (proc) {
970                 proc->read_proc = proc_read_info;
971                 proc->data = acpi_driver_data(device);
972                 proc->owner = THIS_MODULE;
973                 proc->uid = asus_uid;
974                 proc->gid = asus_gid;
975         } else {
976                 printk(KERN_WARNING "  Unable to create " PROC_INFO
977                        " fs entry\n");
978         }
979
980         if (hotk->methods->mt_wled) {
981                 asus_proc_add(PROC_WLED, &proc_write_wled, &proc_read_wled,
982                               mode, device);
983         }
984
985         if (hotk->methods->mt_ledd) {
986                 asus_proc_add(PROC_LEDD, &proc_write_ledd, &proc_read_ledd,
987                               mode, device);
988         }
989
990         if (hotk->methods->mt_mled) {
991                 asus_proc_add(PROC_MLED, &proc_write_mled, &proc_read_mled,
992                               mode, device);
993         }
994
995         if (hotk->methods->mt_tled) {
996                 asus_proc_add(PROC_TLED, &proc_write_tled, &proc_read_tled,
997                               mode, device);
998         }
999
1000         if (hotk->methods->mt_bt_switch) {
1001                 asus_proc_add(PROC_BT, &proc_write_bluetooth,
1002                               &proc_read_bluetooth, mode, device);
1003         }
1004
1005         /* 
1006          * We need both read node and write method as LCD switch is also accessible
1007          * from keyboard 
1008          */
1009         if (hotk->methods->mt_lcd_switch && hotk->methods->lcd_status) {
1010                 asus_proc_add(PROC_LCD, &proc_write_lcd, &proc_read_lcd, mode,
1011                               device);
1012         }
1013
1014         if ((hotk->methods->brightness_up && hotk->methods->brightness_down) ||
1015             (hotk->methods->brightness_get && hotk->methods->brightness_set)) {
1016                 asus_proc_add(PROC_BRN, &proc_write_brn, &proc_read_brn, mode,
1017                               device);
1018         }
1019
1020         if (hotk->methods->display_set) {
1021                 asus_proc_add(PROC_DISP, &proc_write_disp, &proc_read_disp,
1022                               mode, device);
1023         }
1024
1025         return 0;
1026 }
1027
1028 static int asus_hotk_remove_fs(struct acpi_device *device)
1029 {
1030         if (acpi_device_dir(device)) {
1031                 remove_proc_entry(PROC_INFO, acpi_device_dir(device));
1032                 if (hotk->methods->mt_wled)
1033                         remove_proc_entry(PROC_WLED, acpi_device_dir(device));
1034                 if (hotk->methods->mt_mled)
1035                         remove_proc_entry(PROC_MLED, acpi_device_dir(device));
1036                 if (hotk->methods->mt_tled)
1037                         remove_proc_entry(PROC_TLED, acpi_device_dir(device));
1038                 if (hotk->methods->mt_ledd)
1039                         remove_proc_entry(PROC_LEDD, acpi_device_dir(device));
1040                 if (hotk->methods->mt_bt_switch)
1041                         remove_proc_entry(PROC_BT, acpi_device_dir(device));
1042                 if (hotk->methods->mt_lcd_switch && hotk->methods->lcd_status)
1043                         remove_proc_entry(PROC_LCD, acpi_device_dir(device));
1044                 if ((hotk->methods->brightness_up
1045                      && hotk->methods->brightness_down)
1046                     || (hotk->methods->brightness_get
1047                         && hotk->methods->brightness_set))
1048                         remove_proc_entry(PROC_BRN, acpi_device_dir(device));
1049                 if (hotk->methods->display_set)
1050                         remove_proc_entry(PROC_DISP, acpi_device_dir(device));
1051         }
1052         return 0;
1053 }
1054
1055 static void asus_hotk_notify(acpi_handle handle, u32 event, void *data)
1056 {
1057         /* TODO Find a better way to handle events count. */
1058         if (!hotk)
1059                 return;
1060
1061         if ((event & ~((u32) BR_UP)) < 16) {
1062                 hotk->brightness = (event & ~((u32) BR_UP));
1063         } else if ((event & ~((u32) BR_DOWN)) < 16) {
1064                 hotk->brightness = (event & ~((u32) BR_DOWN));
1065         }
1066
1067         acpi_bus_generate_event(hotk->device, event,
1068                                 hotk->event_count[event % 128]++);
1069
1070         return;
1071 }
1072
1073 /*
1074  * Match the model string to the list of supported models. Return END_MODEL if
1075  * no match or model is NULL.
1076  */
1077 static int asus_model_match(char *model)
1078 {
1079         if (model == NULL)
1080                 return END_MODEL;
1081
1082         if (strncmp(model, "L3D", 3) == 0)
1083                 return L3D;
1084         else if (strncmp(model, "L2E", 3) == 0 ||
1085                  strncmp(model, "L3H", 3) == 0 || strncmp(model, "L5D", 3) == 0)
1086                 return L3H;
1087         else if (strncmp(model, "L3", 2) == 0 || strncmp(model, "L2B", 3) == 0)
1088                 return L3C;
1089         else if (strncmp(model, "L8L", 3) == 0)
1090                 return L8L;
1091         else if (strncmp(model, "L4R", 3) == 0)
1092                 return L4R;
1093         else if (strncmp(model, "M6N", 3) == 0 || strncmp(model, "W3N", 3) == 0)
1094                 return M6N;
1095         else if (strncmp(model, "M6R", 3) == 0 || strncmp(model, "A3G", 3) == 0)
1096                 return M6R;
1097         else if (strncmp(model, "M2N", 3) == 0 ||
1098                  strncmp(model, "M3N", 3) == 0 ||
1099                  strncmp(model, "M5N", 3) == 0 ||
1100                  strncmp(model, "M6N", 3) == 0 ||
1101                  strncmp(model, "S1N", 3) == 0 ||
1102                  strncmp(model, "S5N", 3) == 0 || strncmp(model, "W1N", 3) == 0)
1103                 return xxN;
1104         else if (strncmp(model, "M1", 2) == 0)
1105                 return M1A;
1106         else if (strncmp(model, "M2", 2) == 0 || strncmp(model, "L4E", 3) == 0)
1107                 return M2E;
1108         else if (strncmp(model, "L2", 2) == 0)
1109                 return L2D;
1110         else if (strncmp(model, "L8", 2) == 0)
1111                 return S1x;
1112         else if (strncmp(model, "D1", 2) == 0)
1113                 return D1x;
1114         else if (strncmp(model, "A1", 2) == 0)
1115                 return A1x;
1116         else if (strncmp(model, "A2", 2) == 0)
1117                 return A2x;
1118         else if (strncmp(model, "J1", 2) == 0)
1119                 return S2x;
1120         else if (strncmp(model, "L5", 2) == 0)
1121                 return L5x;
1122         else if (strncmp(model, "A4G", 3) == 0)
1123                 return A4G;
1124         else if (strncmp(model, "W1N", 3) == 0)
1125                 return W1N;
1126         else if (strncmp(model, "W3V", 3) == 0)
1127                 return W3V;
1128         else if (strncmp(model, "W5A", 3) == 0)
1129                 return W5A;
1130         else if (strncmp(model, "A4S", 3) == 0)
1131                 return A4S;
1132         else
1133                 return END_MODEL;
1134 }
1135
1136 /*
1137  * This function is used to initialize the hotk with right values. In this
1138  * method, we can make all the detection we want, and modify the hotk struct
1139  */
1140 static int asus_hotk_get_info(void)
1141 {
1142         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1143         union acpi_object *model = NULL;
1144         int bsts_result;
1145         char *string = NULL;
1146         acpi_status status;
1147
1148         /*
1149          * Get DSDT headers early enough to allow for differentiating between 
1150          * models, but late enough to allow acpi_bus_register_driver() to fail 
1151          * before doing anything ACPI-specific. Should we encounter a machine,
1152          * which needs special handling (i.e. its hotkey device has a different
1153          * HID), this bit will be moved. A global variable asus_info contains
1154          * the DSDT header.
1155          */
1156         status = acpi_get_table(ACPI_SIG_DSDT, 1, &asus_info);
1157         if (ACPI_FAILURE(status))
1158                 printk(KERN_WARNING "  Couldn't get the DSDT table header\n");
1159
1160         /* We have to write 0 on init this far for all ASUS models */
1161         if (!write_acpi_int(hotk->handle, "INIT", 0, &buffer)) {
1162                 printk(KERN_ERR "  Hotkey initialization failed\n");
1163                 return -ENODEV;
1164         }
1165
1166         /* This needs to be called for some laptops to init properly */
1167         if (!read_acpi_int(hotk->handle, "BSTS", &bsts_result))
1168                 printk(KERN_WARNING "  Error calling BSTS\n");
1169         else if (bsts_result)
1170                 printk(KERN_NOTICE "  BSTS called, 0x%02x returned\n",
1171                        bsts_result);
1172
1173         /*
1174          * Try to match the object returned by INIT to the specific model.
1175          * Handle every possible object (or the lack of thereof) the DSDT 
1176          * writers might throw at us. When in trouble, we pass NULL to 
1177          * asus_model_match() and try something completely different.
1178          */
1179         if (buffer.pointer) {
1180                 model = buffer.pointer;
1181                 switch (model->type) {
1182                 case ACPI_TYPE_STRING:
1183                         string = model->string.pointer;
1184                         break;
1185                 case ACPI_TYPE_BUFFER:
1186                         string = model->buffer.pointer;
1187                         break;
1188                 default:
1189                         kfree(model);
1190                         break;
1191                 }
1192         }
1193         hotk->model = asus_model_match(string);
1194         if (hotk->model == END_MODEL) { /* match failed */
1195                 if (asus_info &&
1196                     strncmp(asus_info->oem_table_id, "ODEM", 4) == 0) {
1197                         hotk->model = P30;
1198                         printk(KERN_NOTICE
1199                                "  Samsung P30 detected, supported\n");
1200                 } else {
1201                         hotk->model = M2E;
1202                         printk(KERN_NOTICE "  unsupported model %s, trying "
1203                                "default values\n", string);
1204                         printk(KERN_NOTICE
1205                                "  send /proc/acpi/dsdt to the developers\n");
1206                 }
1207                 hotk->methods = &model_conf[hotk->model];
1208                 return AE_OK;
1209         }
1210         hotk->methods = &model_conf[hotk->model];
1211         printk(KERN_NOTICE "  %s model detected, supported\n", string);
1212
1213         /* Sort of per-model blacklist */
1214         if (strncmp(string, "L2B", 3) == 0)
1215                 hotk->methods->lcd_status = NULL;
1216         /* L2B is similar enough to L3C to use its settings, with this only 
1217            exception */
1218         else if (strncmp(string, "A3G", 3) == 0)
1219                 hotk->methods->lcd_status = "\\BLFG";
1220         /* A3G is like M6R */
1221         else if (strncmp(string, "S5N", 3) == 0 ||
1222                  strncmp(string, "M5N", 3) == 0 ||
1223                  strncmp(string, "W3N", 3) == 0)
1224                 hotk->methods->mt_mled = NULL;
1225         /* S5N, M5N and W3N have no MLED */
1226         else if (strncmp(string, "L5D", 3) == 0)
1227                 hotk->methods->mt_wled = NULL;
1228         /* L5D's WLED is not controlled by ACPI */
1229         else if (strncmp(string, "M2N", 3) == 0 ||
1230                  strncmp(string, "W3V", 3) == 0 ||
1231                  strncmp(string, "S1N", 3) == 0)
1232                 hotk->methods->mt_wled = "WLED";
1233         /* M2N, S1N and W3V have a usable WLED */
1234         else if (asus_info) {
1235                 if (strncmp(asus_info->oem_table_id, "L1", 2) == 0)
1236                         hotk->methods->mled_status = NULL;
1237                 /* S1300A reports L84F, but L1400B too, account for that */
1238         }
1239
1240         kfree(model);
1241
1242         return AE_OK;
1243 }
1244
1245 static int asus_hotk_check(void)
1246 {
1247         int result = 0;
1248
1249         result = acpi_bus_get_status(hotk->device);
1250         if (result)
1251                 return result;
1252
1253         if (hotk->device->status.present) {
1254                 result = asus_hotk_get_info();
1255         } else {
1256                 printk(KERN_ERR "  Hotkey device not present, aborting\n");
1257                 return -EINVAL;
1258         }
1259
1260         return result;
1261 }
1262
1263 static int asus_hotk_found;
1264
1265 static int asus_hotk_add(struct acpi_device *device)
1266 {
1267         acpi_status status = AE_OK;
1268         int result;
1269
1270         if (!device)
1271                 return -EINVAL;
1272
1273         printk(KERN_NOTICE "Asus Laptop ACPI Extras version %s\n",
1274                ASUS_ACPI_VERSION);
1275
1276         hotk = kzalloc(sizeof(struct asus_hotk), GFP_KERNEL);
1277         if (!hotk)
1278                 return -ENOMEM;
1279
1280         hotk->handle = device->handle;
1281         strcpy(acpi_device_name(device), ACPI_HOTK_DEVICE_NAME);
1282         strcpy(acpi_device_class(device), ACPI_HOTK_CLASS);
1283         acpi_driver_data(device) = hotk;
1284         hotk->device = device;
1285
1286         result = asus_hotk_check();
1287         if (result)
1288                 goto end;
1289
1290         result = asus_hotk_add_fs(device);
1291         if (result)
1292                 goto end;
1293
1294         /*
1295          * We install the handler, it will receive the hotk in parameter, so, we
1296          * could add other data to the hotk struct
1297          */
1298         status = acpi_install_notify_handler(hotk->handle, ACPI_SYSTEM_NOTIFY,
1299                                              asus_hotk_notify, hotk);
1300         if (ACPI_FAILURE(status))
1301                 printk(KERN_ERR "  Error installing notify handler\n");
1302
1303         /* For laptops without GPLV: init the hotk->brightness value */
1304         if ((!hotk->methods->brightness_get)
1305             && (!hotk->methods->brightness_status)
1306             && (hotk->methods->brightness_up && hotk->methods->brightness_down)) {
1307                 status =
1308                     acpi_evaluate_object(NULL, hotk->methods->brightness_down,
1309                                          NULL, NULL);
1310                 if (ACPI_FAILURE(status))
1311                         printk(KERN_WARNING "  Error changing brightness\n");
1312                 else {
1313                         status =
1314                             acpi_evaluate_object(NULL,
1315                                                  hotk->methods->brightness_up,
1316                                                  NULL, NULL);
1317                         if (ACPI_FAILURE(status))
1318                                 printk(KERN_WARNING "  Strange, error changing"
1319                                        " brightness\n");
1320                 }
1321         }
1322
1323         asus_hotk_found = 1;
1324
1325         /* LED display is off by default */
1326         hotk->ledd_status = 0xFFF;
1327
1328       end:
1329         if (result) {
1330                 kfree(hotk);
1331         }
1332
1333         return result;
1334 }
1335
1336 static int asus_hotk_remove(struct acpi_device *device, int type)
1337 {
1338         acpi_status status = 0;
1339
1340         if (!device || !acpi_driver_data(device))
1341                 return -EINVAL;
1342
1343         status = acpi_remove_notify_handler(hotk->handle, ACPI_SYSTEM_NOTIFY,
1344                                             asus_hotk_notify);
1345         if (ACPI_FAILURE(status))
1346                 printk(KERN_ERR "Asus ACPI: Error removing notify handler\n");
1347
1348         asus_hotk_remove_fs(device);
1349
1350         kfree(hotk);
1351
1352         return 0;
1353 }
1354
1355 static struct backlight_properties asus_backlight_data = {
1356         .owner          = THIS_MODULE,
1357         .get_brightness = read_brightness,
1358         .update_status  = set_brightness_status,
1359         .max_brightness = 15,
1360 };
1361
1362 static void __exit asus_acpi_exit(void)
1363 {
1364         if (asus_backlight_device)
1365                 backlight_device_unregister(asus_backlight_device);
1366
1367         acpi_bus_unregister_driver(&asus_hotk_driver);
1368         remove_proc_entry(PROC_ASUS, acpi_root_dir);
1369
1370         return;
1371 }
1372
1373 static int __init asus_acpi_init(void)
1374 {
1375         int result;
1376
1377         if (acpi_disabled)
1378                 return -ENODEV;
1379
1380         asus_proc_dir = proc_mkdir(PROC_ASUS, acpi_root_dir);
1381         if (!asus_proc_dir) {
1382                 printk(KERN_ERR "Asus ACPI: Unable to create /proc entry\n");
1383                 return -ENODEV;
1384         }
1385         asus_proc_dir->owner = THIS_MODULE;
1386
1387         result = acpi_bus_register_driver(&asus_hotk_driver);
1388         if (result < 0) {
1389                 remove_proc_entry(PROC_ASUS, acpi_root_dir);
1390                 return result;
1391         }
1392
1393         /*
1394          * This is a bit of a kludge.  We only want this module loaded
1395          * for ASUS systems, but there's currently no way to probe the
1396          * ACPI namespace for ASUS HIDs.  So we just return failure if
1397          * we didn't find one, which will cause the module to be
1398          * unloaded.
1399          */
1400         if (!asus_hotk_found) {
1401                 acpi_bus_unregister_driver(&asus_hotk_driver);
1402                 remove_proc_entry(PROC_ASUS, acpi_root_dir);
1403                 return result;
1404         }
1405
1406         asus_backlight_device = backlight_device_register("asus",NULL,NULL,
1407                                                           &asus_backlight_data);
1408         if (IS_ERR(asus_backlight_device)) {
1409                 printk(KERN_ERR "Could not register asus backlight device\n");
1410                 asus_backlight_device = NULL;
1411                 asus_acpi_exit();
1412         }
1413
1414         return 0;
1415 }
1416
1417 module_init(asus_acpi_init);
1418 module_exit(asus_acpi_exit);