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Merge branch 'splice-2.6.22' of git://git.kernel.dk/data/git/linux-2.6-block
[linux-2.6/mini2440.git] / drivers / acpi / asus_acpi.c
blob6d7d4157e049f6d624069900de980629ae3ea866
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_ops asus_backlight_data = {
1356 .get_brightness = read_brightness,
1357 .update_status = set_brightness_status,
1358 };
1359
1360 static void asus_acpi_exit(void)
1361 {
1362 if (asus_backlight_device)
1363 backlight_device_unregister(asus_backlight_device);
1364
1365 acpi_bus_unregister_driver(&asus_hotk_driver);
1366 remove_proc_entry(PROC_ASUS, acpi_root_dir);
1367
1368 return;
1369 }
1370
1371 static int __init asus_acpi_init(void)
1372 {
1373 int result;
1374
1375 if (acpi_disabled)
1376 return -ENODEV;
1377
1378 asus_proc_dir = proc_mkdir(PROC_ASUS, acpi_root_dir);
1379 if (!asus_proc_dir) {
1380 printk(KERN_ERR "Asus ACPI: Unable to create /proc entry\n");
1381 return -ENODEV;
1382 }
1383 asus_proc_dir->owner = THIS_MODULE;
1384
1385 result = acpi_bus_register_driver(&asus_hotk_driver);
1386 if (result < 0) {
1387 remove_proc_entry(PROC_ASUS, acpi_root_dir);
1388 return result;
1389 }
1390
1391 /*
1392 * This is a bit of a kludge. We only want this module loaded
1393 * for ASUS systems, but there's currently no way to probe the
1394 * ACPI namespace for ASUS HIDs. So we just return failure if
1395 * we didn't find one, which will cause the module to be
1396 * unloaded.
1397 */
1398 if (!asus_hotk_found) {
1399 acpi_bus_unregister_driver(&asus_hotk_driver);
1400 remove_proc_entry(PROC_ASUS, acpi_root_dir);
1401 return result;
1402 }
1403
1404 asus_backlight_device = backlight_device_register("asus",NULL,NULL,
1405 &asus_backlight_data);
1406 if (IS_ERR(asus_backlight_device)) {
1407 printk(KERN_ERR "Could not register asus backlight device\n");
1408 asus_backlight_device = NULL;
1409 asus_acpi_exit();
1410 }
1411 asus_backlight_device->props.max_brightness = 15;
1412
1413 return 0;
1414 }
1415
1416 module_init(asus_acpi_init);
1417 module_exit(asus_acpi_exit);
Support for the Chinese Samsung S3C2440 based development boards