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cipso: unsigned buf_len cannot be negative
[linux-2.6/next.git] / drivers / acpi / asus_acpi.c
blob1e74988c7b2d2859871ca335d16af235a3ca7e6f
1 /*
2 * asus_acpi.c - Asus Laptop ACPI Extras
3 *
4 *
5 * Copyright (C) 2002-2005 Julien Lerouge, 2003-2006 Karol Kozimor
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 *
22 * The development page for this driver is located at
23 * http://sourceforge.net/projects/acpi4asus/
24 *
25 * Credits:
26 * Pontus Fuchs - Helper functions, cleanup
27 * Johann Wiesner - Small compile fixes
28 * John Belmonte - ACPI code for Toshiba laptop was a good starting point.
29 * �ic Burghard - LED display support for W1N
30 *
31 */
32
33 #include <linux/kernel.h>
34 #include <linux/module.h>
35 #include <linux/init.h>
36 #include <linux/types.h>
37 #include <linux/proc_fs.h>
38 #include <linux/backlight.h>
39 #include <acpi/acpi_drivers.h>
40 #include <acpi/acpi_bus.h>
41 #include <asm/uaccess.h>
42
43 #define ASUS_ACPI_VERSION "0.30"
44
45 #define PROC_ASUS "asus" /* The directory */
46 #define PROC_MLED "mled"
47 #define PROC_WLED "wled"
48 #define PROC_TLED "tled"
49 #define PROC_BT "bluetooth"
50 #define PROC_LEDD "ledd"
51 #define PROC_INFO "info"
52 #define PROC_LCD "lcd"
53 #define PROC_BRN "brn"
54 #define PROC_DISP "disp"
55
56 #define ACPI_HOTK_NAME "Asus Laptop ACPI Extras Driver"
57 #define ACPI_HOTK_CLASS "hotkey"
58 #define ACPI_HOTK_DEVICE_NAME "Hotkey"
59
60 /*
61 * Some events we use, same for all Asus
62 */
63 #define BR_UP 0x10
64 #define BR_DOWN 0x20
65
66 /*
67 * Flags for hotk status
68 */
69 #define MLED_ON 0x01 /* Mail LED */
70 #define WLED_ON 0x02 /* Wireless LED */
71 #define TLED_ON 0x04 /* Touchpad LED */
72 #define BT_ON 0x08 /* Internal Bluetooth */
73
74 MODULE_AUTHOR("Julien Lerouge, Karol Kozimor");
75 MODULE_DESCRIPTION(ACPI_HOTK_NAME);
76 MODULE_LICENSE("GPL");
77
78 static uid_t asus_uid;
79 static gid_t asus_gid;
80 module_param(asus_uid, uint, 0);
81 MODULE_PARM_DESC(asus_uid, "UID for entries in /proc/acpi/asus");
82 module_param(asus_gid, uint, 0);
83 MODULE_PARM_DESC(asus_gid, "GID for entries in /proc/acpi/asus");
84
85 /* For each model, all features implemented,
86 * those marked with R are relative to HOTK, A for absolute */
87 struct model_data {
88 char *name; /* name of the laptop________________A */
89 char *mt_mled; /* method to handle mled_____________R */
90 char *mled_status; /* node to handle mled reading_______A */
91 char *mt_wled; /* method to handle wled_____________R */
92 char *wled_status; /* node to handle wled reading_______A */
93 char *mt_tled; /* method to handle tled_____________R */
94 char *tled_status; /* node to handle tled reading_______A */
95 char *mt_ledd; /* method to handle LED display______R */
96 char *mt_bt_switch; /* method to switch Bluetooth on/off_R */
97 char *bt_status; /* no model currently supports this__? */
98 char *mt_lcd_switch; /* method to turn LCD on/off_________A */
99 char *lcd_status; /* node to read LCD panel state______A */
100 char *brightness_up; /* method to set brightness up_______A */
101 char *brightness_down; /* method to set brightness down ____A */
102 char *brightness_set; /* method to set absolute brightness_R */
103 char *brightness_get; /* method to get absolute brightness_R */
104 char *brightness_status;/* node to get brightness____________A */
105 char *display_set; /* method to set video output________R */
106 char *display_get; /* method to get video output________R */
107 };
108
109 /*
110 * This is the main structure, we can use it to store anything interesting
111 * about the hotk device
112 */
113 struct asus_hotk {
114 struct acpi_device *device; /* the device we are in */
115 acpi_handle handle; /* the handle of the hotk device */
116 char status; /* status of the hotk, for LEDs */
117 u32 ledd_status; /* status of the LED display */
118 struct model_data *methods; /* methods available on the laptop */
119 u8 brightness; /* brightness level */
120 enum {
121 A1x = 0, /* A1340D, A1300F */
122 A2x, /* A2500H */
123 A4G, /* A4700G */
124 D1x, /* D1 */
125 L2D, /* L2000D */
126 L3C, /* L3800C */
127 L3D, /* L3400D */
128 L3H, /* L3H, L2000E, L5D */
129 L4R, /* L4500R */
130 L5x, /* L5800C */
131 L8L, /* L8400L */
132 M1A, /* M1300A */
133 M2E, /* M2400E, L4400L */
134 M6N, /* M6800N, W3400N */
135 M6R, /* M6700R, A3000G */
136 P30, /* Samsung P30 */
137 S1x, /* S1300A, but also L1400B and M2400A (L84F) */
138 S2x, /* S200 (J1 reported), Victor MP-XP7210 */
139 W1N, /* W1000N */
140 W5A, /* W5A */
141 W3V, /* W3030V */
142 xxN, /* M2400N, M3700N, M5200N, M6800N,
143 S1300N, S5200N*/
144 A4S, /* Z81sp */
145 F3Sa, /* (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 .name = "F3Sa",
413 .mt_bt_switch = "BLED",
414 .mt_wled = "WLED",
415 .mt_mled = "MLED",
416 .brightness_get = "GPLV",
417 .brightness_set = "SPLV",
418 .mt_lcd_switch = "\\_SB.PCI0.SBRG.EC0._Q10",
419 .lcd_status = "\\_SB.PCI0.SBRG.EC0.RPIN",
420 .display_get = "\\ADVG",
421 .display_set = "SDSP",
422 },
423
424 };
425
426 /* procdir we use */
427 static struct proc_dir_entry *asus_proc_dir;
428
429 static struct backlight_device *asus_backlight_device;
430
431 /*
432 * This header is made available to allow proper configuration given model,
433 * revision number , ... this info cannot go in struct asus_hotk because it is
434 * available before the hotk
435 */
436 static struct acpi_table_header *asus_info;
437
438 /* The actual device the driver binds to */
439 static struct asus_hotk *hotk;
440
441 /*
442 * The hotkey driver and autoloading declaration
443 */
444 static int asus_hotk_add(struct acpi_device *device);
445 static int asus_hotk_remove(struct acpi_device *device, int type);
446 static const struct acpi_device_id asus_device_ids[] = {
447 {"ATK0100", 0},
448 {"", 0},
449 };
450 MODULE_DEVICE_TABLE(acpi, asus_device_ids);
451
452 static struct acpi_driver asus_hotk_driver = {
453 .name = "asus_acpi",
454 .class = ACPI_HOTK_CLASS,
455 .ids = asus_device_ids,
456 .ops = {
457 .add = asus_hotk_add,
458 .remove = asus_hotk_remove,
459 },
460 };
461
462 /*
463 * This function evaluates an ACPI method, given an int as parameter, the
464 * method is searched within the scope of the handle, can be NULL. The output
465 * of the method is written is output, which can also be NULL
466 *
467 * returns 1 if write is successful, 0 else.
468 */
469 static int write_acpi_int(acpi_handle handle, const char *method, int val,
470 struct acpi_buffer *output)
471 {
472 struct acpi_object_list params; /* list of input parameters (int) */
473 union acpi_object in_obj; /* the only param we use */
474 acpi_status status;
475
476 params.count = 1;
477 params.pointer = &in_obj;
478 in_obj.type = ACPI_TYPE_INTEGER;
479 in_obj.integer.value = val;
480
481 status = acpi_evaluate_object(handle, (char *)method, &params, output);
482 return (status == AE_OK);
483 }
484
485 static int read_acpi_int(acpi_handle handle, const char *method, int *val)
486 {
487 struct acpi_buffer output;
488 union acpi_object out_obj;
489 acpi_status status;
490
491 output.length = sizeof(out_obj);
492 output.pointer = &out_obj;
493
494 status = acpi_evaluate_object(handle, (char *)method, NULL, &output);
495 *val = out_obj.integer.value;
496 return (status == AE_OK) && (out_obj.type == ACPI_TYPE_INTEGER);
497 }
498
499 /*
500 * We write our info in page, we begin at offset off and cannot write more
501 * than count bytes. We set eof to 1 if we handle those 2 values. We return the
502 * number of bytes written in page
503 */
504 static int
505 proc_read_info(char *page, char **start, off_t off, int count, int *eof,
506 void *data)
507 {
508 int len = 0;
509 int temp;
510 char buf[16]; /* enough for all info */
511 /*
512 * We use the easy way, we don't care of off and count,
513 * so we don't set eof to 1
514 */
515
516 len += sprintf(page, ACPI_HOTK_NAME " " ASUS_ACPI_VERSION "\n");
517 len += sprintf(page + len, "Model reference : %s\n",
518 hotk->methods->name);
519 /*
520 * The SFUN method probably allows the original driver to get the list
521 * of features supported by a given model. For now, 0x0100 or 0x0800
522 * bit signifies that the laptop is equipped with a Wi-Fi MiniPCI card.
523 * The significance of others is yet to be found.
524 */
525 if (read_acpi_int(hotk->handle, "SFUN", &temp))
526 len +=
527 sprintf(page + len, "SFUN value : 0x%04x\n", temp);
528 /*
529 * Another value for userspace: the ASYM method returns 0x02 for
530 * battery low and 0x04 for battery critical, its readings tend to be
531 * more accurate than those provided by _BST.
532 * Note: since not all the laptops provide this method, errors are
533 * silently ignored.
534 */
535 if (read_acpi_int(hotk->handle, "ASYM", &temp))
536 len +=
537 sprintf(page + len, "ASYM value : 0x%04x\n", temp);
538 if (asus_info) {
539 snprintf(buf, 16, "%d", asus_info->length);
540 len += sprintf(page + len, "DSDT length : %s\n", buf);
541 snprintf(buf, 16, "%d", asus_info->checksum);
542 len += sprintf(page + len, "DSDT checksum : %s\n", buf);
543 snprintf(buf, 16, "%d", asus_info->revision);
544 len += sprintf(page + len, "DSDT revision : %s\n", buf);
545 snprintf(buf, 7, "%s", asus_info->oem_id);
546 len += sprintf(page + len, "OEM id : %s\n", buf);
547 snprintf(buf, 9, "%s", asus_info->oem_table_id);
548 len += sprintf(page + len, "OEM table id : %s\n", buf);
549 snprintf(buf, 16, "%x", asus_info->oem_revision);
550 len += sprintf(page + len, "OEM revision : 0x%s\n", buf);
551 snprintf(buf, 5, "%s", asus_info->asl_compiler_id);
552 len += sprintf(page + len, "ASL comp vendor id : %s\n", buf);
553 snprintf(buf, 16, "%x", asus_info->asl_compiler_revision);
554 len += sprintf(page + len, "ASL comp revision : 0x%s\n", buf);
555 }
556
557 return len;
558 }
559
560 /*
561 * /proc handlers
562 * We write our info in page, we begin at offset off and cannot write more
563 * than count bytes. We set eof to 1 if we handle those 2 values. We return the
564 * number of bytes written in page
565 */
566
567 /* Generic LED functions */
568 static int read_led(const char *ledname, int ledmask)
569 {
570 if (ledname) {
571 int led_status;
572
573 if (read_acpi_int(NULL, ledname, &led_status))
574 return led_status;
575 else
576 printk(KERN_WARNING "Asus ACPI: Error reading LED "
577 "status\n");
578 }
579 return (hotk->status & ledmask) ? 1 : 0;
580 }
581
582 static int parse_arg(const char __user *buf, unsigned long count, int *val)
583 {
584 char s[32];
585 if (!count)
586 return 0;
587 if (count > 31)
588 return -EINVAL;
589 if (copy_from_user(s, buf, count))
590 return -EFAULT;
591 s[count] = 0;
592 if (sscanf(s, "%i", val) != 1)
593 return -EINVAL;
594 return count;
595 }
596
597 /* FIXME: kill extraneous args so it can be called independently */
598 static int
599 write_led(const char __user *buffer, unsigned long count,
600 char *ledname, int ledmask, int invert)
601 {
602 int rv, value;
603 int led_out = 0;
604
605 rv = parse_arg(buffer, count, &value);
606 if (rv > 0)
607 led_out = value ? 1 : 0;
608
609 hotk->status =
610 (led_out) ? (hotk->status | ledmask) : (hotk->status & ~ledmask);
611
612 if (invert) /* invert target value */
613 led_out = !led_out;
614
615 if (!write_acpi_int(hotk->handle, ledname, led_out, NULL))
616 printk(KERN_WARNING "Asus ACPI: LED (%s) write failed\n",
617 ledname);
618
619 return rv;
620 }
621
622 /*
623 * Proc handlers for MLED
624 */
625 static int
626 proc_read_mled(char *page, char **start, off_t off, int count, int *eof,
627 void *data)
628 {
629 return sprintf(page, "%d\n",
630 read_led(hotk->methods->mled_status, MLED_ON));
631 }
632
633 static int
634 proc_write_mled(struct file *file, const char __user *buffer,
635 unsigned long count, void *data)
636 {
637 return write_led(buffer, count, hotk->methods->mt_mled, MLED_ON, 1);
638 }
639
640 /*
641 * Proc handlers for LED display
642 */
643 static int
644 proc_read_ledd(char *page, char **start, off_t off, int count, int *eof,
645 void *data)
646 {
647 return sprintf(page, "0x%08x\n", hotk->ledd_status);
648 }
649
650 static int
651 proc_write_ledd(struct file *file, const char __user *buffer,
652 unsigned long count, void *data)
653 {
654 int rv, value;
655
656 rv = parse_arg(buffer, count, &value);
657 if (rv > 0) {
658 if (!write_acpi_int
659 (hotk->handle, hotk->methods->mt_ledd, value, NULL))
660 printk(KERN_WARNING
661 "Asus ACPI: LED display write failed\n");
662 else
663 hotk->ledd_status = (u32) value;
664 }
665 return rv;
666 }
667
668 /*
669 * Proc handlers for WLED
670 */
671 static int
672 proc_read_wled(char *page, char **start, off_t off, int count, int *eof,
673 void *data)
674 {
675 return sprintf(page, "%d\n",
676 read_led(hotk->methods->wled_status, WLED_ON));
677 }
678
679 static int
680 proc_write_wled(struct file *file, const char __user *buffer,
681 unsigned long count, void *data)
682 {
683 return write_led(buffer, count, hotk->methods->mt_wled, WLED_ON, 0);
684 }
685
686 /*
687 * Proc handlers for Bluetooth
688 */
689 static int
690 proc_read_bluetooth(char *page, char **start, off_t off, int count, int *eof,
691 void *data)
692 {
693 return sprintf(page, "%d\n", read_led(hotk->methods->bt_status, BT_ON));
694 }
695
696 static int
697 proc_write_bluetooth(struct file *file, const char __user *buffer,
698 unsigned long count, void *data)
699 {
700 /* Note: mt_bt_switch controls both internal Bluetooth adapter's
701 presence and its LED */
702 return write_led(buffer, count, hotk->methods->mt_bt_switch, BT_ON, 0);
703 }
704
705 /*
706 * Proc handlers for TLED
707 */
708 static int
709 proc_read_tled(char *page, char **start, off_t off, int count, int *eof,
710 void *data)
711 {
712 return sprintf(page, "%d\n",
713 read_led(hotk->methods->tled_status, TLED_ON));
714 }
715
716 static int
717 proc_write_tled(struct file *file, const char __user *buffer,
718 unsigned long count, void *data)
719 {
720 return write_led(buffer, count, hotk->methods->mt_tled, TLED_ON, 0);
721 }
722
723 static int get_lcd_state(void)
724 {
725 int lcd = 0;
726
727 if (hotk->model == L3H) {
728 /* L3H and the like have to be handled differently */
729 acpi_status status = 0;
730 struct acpi_object_list input;
731 union acpi_object mt_params[2];
732 struct acpi_buffer output;
733 union acpi_object out_obj;
734
735 input.count = 2;
736 input.pointer = mt_params;
737 /* Note: the following values are partly guessed up, but
738 otherwise they seem to work */
739 mt_params[0].type = ACPI_TYPE_INTEGER;
740 mt_params[0].integer.value = 0x02;
741 mt_params[1].type = ACPI_TYPE_INTEGER;
742 mt_params[1].integer.value = 0x02;
743
744 output.length = sizeof(out_obj);
745 output.pointer = &out_obj;
746
747 status =
748 acpi_evaluate_object(NULL, hotk->methods->lcd_status,
749 &input, &output);
750 if (status != AE_OK)
751 return -1;
752 if (out_obj.type == ACPI_TYPE_INTEGER)
753 /* That's what the AML code does */
754 lcd = out_obj.integer.value >> 8;
755 } else if (hotk->model == F3Sa) {
756 unsigned long long tmp;
757 union acpi_object param;
758 struct acpi_object_list input;
759 acpi_status status;
760
761 /* Read pin 11 */
762 param.type = ACPI_TYPE_INTEGER;
763 param.integer.value = 0x11;
764 input.count = 1;
765 input.pointer = &param;
766
767 status = acpi_evaluate_integer(NULL, hotk->methods->lcd_status,
768 &input, &tmp);
769 if (status != AE_OK)
770 return -1;
771
772 lcd = tmp;
773 } else {
774 /* We don't have to check anything if we are here */
775 if (!read_acpi_int(NULL, hotk->methods->lcd_status, &lcd))
776 printk(KERN_WARNING
777 "Asus ACPI: Error reading LCD status\n");
778
779 if (hotk->model == L2D)
780 lcd = ~lcd;
781 }
782
783 return (lcd & 1);
784 }
785
786 static int set_lcd_state(int value)
787 {
788 int lcd = 0;
789 acpi_status status = 0;
790
791 lcd = value ? 1 : 0;
792 if (lcd != get_lcd_state()) {
793 /* switch */
794 if (hotk->model != L3H) {
795 status =
796 acpi_evaluate_object(NULL,
797 hotk->methods->mt_lcd_switch,
798 NULL, NULL);
799 } else {
800 /* L3H and the like must be handled differently */
801 if (!write_acpi_int
802 (hotk->handle, hotk->methods->mt_lcd_switch, 0x07,
803 NULL))
804 status = AE_ERROR;
805 /* L3H's AML executes EHK (0x07) upon Fn+F7 keypress,
806 the exact behaviour is simulated here */
807 }
808 if (ACPI_FAILURE(status))
809 printk(KERN_WARNING "Asus ACPI: Error switching LCD\n");
810 }
811 return 0;
812
813 }
814
815 static int
816 proc_read_lcd(char *page, char **start, off_t off, int count, int *eof,
817 void *data)
818 {
819 return sprintf(page, "%d\n", get_lcd_state());
820 }
821
822 static int
823 proc_write_lcd(struct file *file, const char __user *buffer,
824 unsigned long count, void *data)
825 {
826 int rv, value;
827
828 rv = parse_arg(buffer, count, &value);
829 if (rv > 0)
830 set_lcd_state(value);
831 return rv;
832 }
833
834 static int read_brightness(struct backlight_device *bd)
835 {
836 int value;
837
838 if (hotk->methods->brightness_get) { /* SPLV/GPLV laptop */
839 if (!read_acpi_int(hotk->handle, hotk->methods->brightness_get,
840 &value))
841 printk(KERN_WARNING
842 "Asus ACPI: Error reading brightness\n");
843 } else if (hotk->methods->brightness_status) { /* For D1 for example */
844 if (!read_acpi_int(NULL, hotk->methods->brightness_status,
845 &value))
846 printk(KERN_WARNING
847 "Asus ACPI: Error reading brightness\n");
848 } else /* No GPLV method */
849 value = hotk->brightness;
850 return value;
851 }
852
853 /*
854 * Change the brightness level
855 */
856 static int set_brightness(int value)
857 {
858 acpi_status status = 0;
859 int ret = 0;
860
861 /* SPLV laptop */
862 if (hotk->methods->brightness_set) {
863 if (!write_acpi_int(hotk->handle, hotk->methods->brightness_set,
864 value, NULL))
865 printk(KERN_WARNING
866 "Asus ACPI: Error changing brightness\n");
867 ret = -EIO;
868 goto out;
869 }
870
871 /* No SPLV method if we are here, act as appropriate */
872 value -= read_brightness(NULL);
873 while (value != 0) {
874 status = acpi_evaluate_object(NULL, (value > 0) ?
875 hotk->methods->brightness_up :
876 hotk->methods->brightness_down,
877 NULL, NULL);
878 (value > 0) ? value-- : value++;
879 if (ACPI_FAILURE(status))
880 printk(KERN_WARNING
881 "Asus ACPI: Error changing brightness\n");
882 ret = -EIO;
883 }
884 out:
885 return ret;
886 }
887
888 static int set_brightness_status(struct backlight_device *bd)
889 {
890 return set_brightness(bd->props.brightness);
891 }
892
893 static int
894 proc_read_brn(char *page, char **start, off_t off, int count, int *eof,
895 void *data)
896 {
897 return sprintf(page, "%d\n", read_brightness(NULL));
898 }
899
900 static int
901 proc_write_brn(struct file *file, const char __user *buffer,
902 unsigned long count, void *data)
903 {
904 int rv, value;
905
906 rv = parse_arg(buffer, count, &value);
907 if (rv > 0) {
908 value = (0 < value) ? ((15 < value) ? 15 : value) : 0;
909 /* 0 <= value <= 15 */
910 set_brightness(value);
911 }
912 return rv;
913 }
914
915 static void set_display(int value)
916 {
917 /* no sanity check needed for now */
918 if (!write_acpi_int(hotk->handle, hotk->methods->display_set,
919 value, NULL))
920 printk(KERN_WARNING "Asus ACPI: Error setting display\n");
921 return;
922 }
923
924 /*
925 * Now, *this* one could be more user-friendly, but so far, no-one has
926 * complained. The significance of bits is the same as in proc_write_disp()
927 */
928 static int
929 proc_read_disp(char *page, char **start, off_t off, int count, int *eof,
930 void *data)
931 {
932 int value = 0;
933
934 if (!read_acpi_int(hotk->handle, hotk->methods->display_get, &value))
935 printk(KERN_WARNING
936 "Asus ACPI: Error reading display status\n");
937 value &= 0x07; /* needed for some models, shouldn't hurt others */
938 return sprintf(page, "%d\n", value);
939 }
940
941 /*
942 * Experimental support for display switching. As of now: 1 should activate
943 * the LCD output, 2 should do for CRT, and 4 for TV-Out. Any combination
944 * (bitwise) of these will suffice. I never actually tested 3 displays hooked
945 * up simultaneously, so be warned. See the acpi4asus README for more info.
946 */
947 static int
948 proc_write_disp(struct file *file, const char __user *buffer,
949 unsigned long count, void *data)
950 {
951 int rv, value;
952
953 rv = parse_arg(buffer, count, &value);
954 if (rv > 0)
955 set_display(value);
956 return rv;
957 }
958
959 typedef int (proc_readfunc) (char *page, char **start, off_t off, int count,
960 int *eof, void *data);
961 typedef int (proc_writefunc) (struct file *file, const char __user *buffer,
962 unsigned long count, void *data);
963
964 static int
965 asus_proc_add(char *name, proc_writefunc *writefunc,
966 proc_readfunc *readfunc, mode_t mode,
967 struct acpi_device *device)
968 {
969 struct proc_dir_entry *proc =
970 create_proc_entry(name, mode, acpi_device_dir(device));
971 if (!proc) {
972 printk(KERN_WARNING " Unable to create %s fs entry\n", name);
973 return -1;
974 }
975 proc->write_proc = writefunc;
976 proc->read_proc = readfunc;
977 proc->data = acpi_driver_data(device);
978 proc->owner = THIS_MODULE;
979 proc->uid = asus_uid;
980 proc->gid = asus_gid;
981 return 0;
982 }
983
984 static int asus_hotk_add_fs(struct acpi_device *device)
985 {
986 struct proc_dir_entry *proc;
987 mode_t mode;
988
989 /*
990 * If parameter uid or gid is not changed, keep the default setting for
991 * our proc entries (-rw-rw-rw-) else, it means we care about security,
992 * and then set to -rw-rw----
993 */
994
995 if ((asus_uid == 0) && (asus_gid == 0)) {
996 mode = S_IFREG | S_IRUGO | S_IWUGO;
997 } else {
998 mode = S_IFREG | S_IRUSR | S_IRGRP | S_IWUSR | S_IWGRP;
999 printk(KERN_WARNING " asus_uid and asus_gid parameters are "
1000 "deprecated, use chown and chmod instead!\n");
1001 }
1002
1003 acpi_device_dir(device) = asus_proc_dir;
1004 if (!acpi_device_dir(device))
1005 return -ENODEV;
1006
1007 proc = create_proc_entry(PROC_INFO, mode, acpi_device_dir(device));
1008 if (proc) {
1009 proc->read_proc = proc_read_info;
1010 proc->data = acpi_driver_data(device);
1011 proc->owner = THIS_MODULE;
1012 proc->uid = asus_uid;
1013 proc->gid = asus_gid;
1014 } else {
1015 printk(KERN_WARNING " Unable to create " PROC_INFO
1016 " fs entry\n");
1017 }
1018
1019 if (hotk->methods->mt_wled) {
1020 asus_proc_add(PROC_WLED, &proc_write_wled, &proc_read_wled,
1021 mode, device);
1022 }
1023
1024 if (hotk->methods->mt_ledd) {
1025 asus_proc_add(PROC_LEDD, &proc_write_ledd, &proc_read_ledd,
1026 mode, device);
1027 }
1028
1029 if (hotk->methods->mt_mled) {
1030 asus_proc_add(PROC_MLED, &proc_write_mled, &proc_read_mled,
1031 mode, device);
1032 }
1033
1034 if (hotk->methods->mt_tled) {
1035 asus_proc_add(PROC_TLED, &proc_write_tled, &proc_read_tled,
1036 mode, device);
1037 }
1038
1039 if (hotk->methods->mt_bt_switch) {
1040 asus_proc_add(PROC_BT, &proc_write_bluetooth,
1041 &proc_read_bluetooth, mode, device);
1042 }
1043
1044 /*
1045 * We need both read node and write method as LCD switch is also
1046 * accessible from the keyboard
1047 */
1048 if (hotk->methods->mt_lcd_switch && hotk->methods->lcd_status) {
1049 asus_proc_add(PROC_LCD, &proc_write_lcd, &proc_read_lcd, mode,
1050 device);
1051 }
1052
1053 if ((hotk->methods->brightness_up && hotk->methods->brightness_down) ||
1054 (hotk->methods->brightness_get && hotk->methods->brightness_set)) {
1055 asus_proc_add(PROC_BRN, &proc_write_brn, &proc_read_brn, mode,
1056 device);
1057 }
1058
1059 if (hotk->methods->display_set) {
1060 asus_proc_add(PROC_DISP, &proc_write_disp, &proc_read_disp,
1061 mode, device);
1062 }
1063
1064 return 0;
1065 }
1066
1067 static int asus_hotk_remove_fs(struct acpi_device *device)
1068 {
1069 if (acpi_device_dir(device)) {
1070 remove_proc_entry(PROC_INFO, acpi_device_dir(device));
1071 if (hotk->methods->mt_wled)
1072 remove_proc_entry(PROC_WLED, acpi_device_dir(device));
1073 if (hotk->methods->mt_mled)
1074 remove_proc_entry(PROC_MLED, acpi_device_dir(device));
1075 if (hotk->methods->mt_tled)
1076 remove_proc_entry(PROC_TLED, acpi_device_dir(device));
1077 if (hotk->methods->mt_ledd)
1078 remove_proc_entry(PROC_LEDD, acpi_device_dir(device));
1079 if (hotk->methods->mt_bt_switch)
1080 remove_proc_entry(PROC_BT, acpi_device_dir(device));
1081 if (hotk->methods->mt_lcd_switch && hotk->methods->lcd_status)
1082 remove_proc_entry(PROC_LCD, acpi_device_dir(device));
1083 if ((hotk->methods->brightness_up
1084 && hotk->methods->brightness_down)
1085 || (hotk->methods->brightness_get
1086 && hotk->methods->brightness_set))
1087 remove_proc_entry(PROC_BRN, acpi_device_dir(device));
1088 if (hotk->methods->display_set)
1089 remove_proc_entry(PROC_DISP, acpi_device_dir(device));
1090 }
1091 return 0;
1092 }
1093
1094 static void asus_hotk_notify(acpi_handle handle, u32 event, void *data)
1095 {
1096 /* TODO Find a better way to handle events count. */
1097 if (!hotk)
1098 return;
1099
1100 if ((event & ~((u32) BR_UP)) < 16)
1101 hotk->brightness = (event & ~((u32) BR_UP));
1102 else if ((event & ~((u32) BR_DOWN)) < 16)
1103 hotk->brightness = (event & ~((u32) BR_DOWN));
1104
1105 acpi_bus_generate_proc_event(hotk->device, event,
1106 hotk->event_count[event % 128]++);
1107
1108 return;
1109 }
1110
1111 /*
1112 * Match the model string to the list of supported models. Return END_MODEL if
1113 * no match or model is NULL.
1114 */
1115 static int asus_model_match(char *model)
1116 {
1117 if (model == NULL)
1118 return END_MODEL;
1119
1120 if (strncmp(model, "L3D", 3) == 0)
1121 return L3D;
1122 else if (strncmp(model, "L2E", 3) == 0 ||
1123 strncmp(model, "L3H", 3) == 0 || strncmp(model, "L5D", 3) == 0)
1124 return L3H;
1125 else if (strncmp(model, "L3", 2) == 0 || strncmp(model, "L2B", 3) == 0)
1126 return L3C;
1127 else if (strncmp(model, "L8L", 3) == 0)
1128 return L8L;
1129 else if (strncmp(model, "L4R", 3) == 0)
1130 return L4R;
1131 else if (strncmp(model, "M6N", 3) == 0 || strncmp(model, "W3N", 3) == 0)
1132 return M6N;
1133 else if (strncmp(model, "M6R", 3) == 0 || strncmp(model, "A3G", 3) == 0)
1134 return M6R;
1135 else if (strncmp(model, "M2N", 3) == 0 ||
1136 strncmp(model, "M3N", 3) == 0 ||
1137 strncmp(model, "M5N", 3) == 0 ||
1138 strncmp(model, "M6N", 3) == 0 ||
1139 strncmp(model, "S1N", 3) == 0 ||
1140 strncmp(model, "S5N", 3) == 0 || strncmp(model, "W1N", 3) == 0)
1141 return xxN;
1142 else if (strncmp(model, "M1", 2) == 0)
1143 return M1A;
1144 else if (strncmp(model, "M2", 2) == 0 || strncmp(model, "L4E", 3) == 0)
1145 return M2E;
1146 else if (strncmp(model, "L2", 2) == 0)
1147 return L2D;
1148 else if (strncmp(model, "L8", 2) == 0)
1149 return S1x;
1150 else if (strncmp(model, "D1", 2) == 0)
1151 return D1x;
1152 else if (strncmp(model, "A1", 2) == 0)
1153 return A1x;
1154 else if (strncmp(model, "A2", 2) == 0)
1155 return A2x;
1156 else if (strncmp(model, "J1", 2) == 0)
1157 return S2x;
1158 else if (strncmp(model, "L5", 2) == 0)
1159 return L5x;
1160 else if (strncmp(model, "A4G", 3) == 0)
1161 return A4G;
1162 else if (strncmp(model, "W1N", 3) == 0)
1163 return W1N;
1164 else if (strncmp(model, "W3V", 3) == 0)
1165 return W3V;
1166 else if (strncmp(model, "W5A", 3) == 0)
1167 return W5A;
1168 else if (strncmp(model, "A4S", 3) == 0)
1169 return A4S;
1170 else if (strncmp(model, "F3Sa", 4) == 0)
1171 return F3Sa;
1172 else
1173 return END_MODEL;
1174 }
1175
1176 /*
1177 * This function is used to initialize the hotk with right values. In this
1178 * method, we can make all the detection we want, and modify the hotk struct
1179 */
1180 static int asus_hotk_get_info(void)
1181 {
1182 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1183 union acpi_object *model = NULL;
1184 int bsts_result;
1185 char *string = NULL;
1186 acpi_status status;
1187
1188 /*
1189 * Get DSDT headers early enough to allow for differentiating between
1190 * models, but late enough to allow acpi_bus_register_driver() to fail
1191 * before doing anything ACPI-specific. Should we encounter a machine,
1192 * which needs special handling (i.e. its hotkey device has a different
1193 * HID), this bit will be moved. A global variable asus_info contains
1194 * the DSDT header.
1195 */
1196 status = acpi_get_table(ACPI_SIG_DSDT, 1, &asus_info);
1197 if (ACPI_FAILURE(status))
1198 printk(KERN_WARNING " Couldn't get the DSDT table header\n");
1199
1200 /* We have to write 0 on init this far for all ASUS models */
1201 if (!write_acpi_int(hotk->handle, "INIT", 0, &buffer)) {
1202 printk(KERN_ERR " Hotkey initialization failed\n");
1203 return -ENODEV;
1204 }
1205
1206 /* This needs to be called for some laptops to init properly */
1207 if (!read_acpi_int(hotk->handle, "BSTS", &bsts_result))
1208 printk(KERN_WARNING " Error calling BSTS\n");
1209 else if (bsts_result)
1210 printk(KERN_NOTICE " BSTS called, 0x%02x returned\n",
1211 bsts_result);
1212
1213 /*
1214 * Try to match the object returned by INIT to the specific model.
1215 * Handle every possible object (or the lack of thereof) the DSDT
1216 * writers might throw at us. When in trouble, we pass NULL to
1217 * asus_model_match() and try something completely different.
1218 */
1219 if (buffer.pointer) {
1220 model = buffer.pointer;
1221 switch (model->type) {
1222 case ACPI_TYPE_STRING:
1223 string = model->string.pointer;
1224 break;
1225 case ACPI_TYPE_BUFFER:
1226 string = model->buffer.pointer;
1227 break;
1228 default:
1229 kfree(model);
1230 model = NULL;
1231 break;
1232 }
1233 }
1234 hotk->model = asus_model_match(string);
1235 if (hotk->model == END_MODEL) { /* match failed */
1236 if (asus_info &&
1237 strncmp(asus_info->oem_table_id, "ODEM", 4) == 0) {
1238 hotk->model = P30;
1239 printk(KERN_NOTICE
1240 " Samsung P30 detected, supported\n");
1241 } else {
1242 hotk->model = M2E;
1243 printk(KERN_NOTICE " unsupported model %s, trying "
1244 "default values\n", string);
1245 printk(KERN_NOTICE
1246 " send /proc/acpi/dsdt to the developers\n");
1247 kfree(model);
1248 return -ENODEV;
1249 }
1250 hotk->methods = &model_conf[hotk->model];
1251 return AE_OK;
1252 }
1253 hotk->methods = &model_conf[hotk->model];
1254 printk(KERN_NOTICE " %s model detected, supported\n", string);
1255
1256 /* Sort of per-model blacklist */
1257 if (strncmp(string, "L2B", 3) == 0)
1258 hotk->methods->lcd_status = NULL;
1259 /* L2B is similar enough to L3C to use its settings, with this only
1260 exception */
1261 else if (strncmp(string, "A3G", 3) == 0)
1262 hotk->methods->lcd_status = "\\BLFG";
1263 /* A3G is like M6R */
1264 else if (strncmp(string, "S5N", 3) == 0 ||
1265 strncmp(string, "M5N", 3) == 0 ||
1266 strncmp(string, "W3N", 3) == 0)
1267 hotk->methods->mt_mled = NULL;
1268 /* S5N, M5N and W3N have no MLED */
1269 else if (strncmp(string, "L5D", 3) == 0)
1270 hotk->methods->mt_wled = NULL;
1271 /* L5D's WLED is not controlled by ACPI */
1272 else if (strncmp(string, "M2N", 3) == 0 ||
1273 strncmp(string, "W3V", 3) == 0 ||
1274 strncmp(string, "S1N", 3) == 0)
1275 hotk->methods->mt_wled = "WLED";
1276 /* M2N, S1N and W3V have a usable WLED */
1277 else if (asus_info) {
1278 if (strncmp(asus_info->oem_table_id, "L1", 2) == 0)
1279 hotk->methods->mled_status = NULL;
1280 /* S1300A reports L84F, but L1400B too, account for that */
1281 }
1282
1283 kfree(model);
1284
1285 return AE_OK;
1286 }
1287
1288 static int asus_hotk_check(void)
1289 {
1290 int result = 0;
1291
1292 result = acpi_bus_get_status(hotk->device);
1293 if (result)
1294 return result;
1295
1296 if (hotk->device->status.present) {
1297 result = asus_hotk_get_info();
1298 } else {
1299 printk(KERN_ERR " Hotkey device not present, aborting\n");
1300 return -EINVAL;
1301 }
1302
1303 return result;
1304 }
1305
1306 static int asus_hotk_found;
1307
1308 static int asus_hotk_add(struct acpi_device *device)
1309 {
1310 acpi_status status = AE_OK;
1311 int result;
1312
1313 if (!device)
1314 return -EINVAL;
1315
1316 printk(KERN_NOTICE "Asus Laptop ACPI Extras version %s\n",
1317 ASUS_ACPI_VERSION);
1318
1319 hotk = kzalloc(sizeof(struct asus_hotk), GFP_KERNEL);
1320 if (!hotk)
1321 return -ENOMEM;
1322
1323 hotk->handle = device->handle;
1324 strcpy(acpi_device_name(device), ACPI_HOTK_DEVICE_NAME);
1325 strcpy(acpi_device_class(device), ACPI_HOTK_CLASS);
1326 device->driver_data = hotk;
1327 hotk->device = device;
1328
1329 result = asus_hotk_check();
1330 if (result)
1331 goto end;
1332
1333 result = asus_hotk_add_fs(device);
1334 if (result)
1335 goto end;
1336
1337 /*
1338 * We install the handler, it will receive the hotk in parameter, so, we
1339 * could add other data to the hotk struct
1340 */
1341 status = acpi_install_notify_handler(hotk->handle, ACPI_SYSTEM_NOTIFY,
1342 asus_hotk_notify, hotk);
1343 if (ACPI_FAILURE(status))
1344 printk(KERN_ERR " Error installing notify handler\n");
1345
1346 /* For laptops without GPLV: init the hotk->brightness value */
1347 if ((!hotk->methods->brightness_get)
1348 && (!hotk->methods->brightness_status)
1349 && (hotk->methods->brightness_up && hotk->methods->brightness_down)) {
1350 status =
1351 acpi_evaluate_object(NULL, hotk->methods->brightness_down,
1352 NULL, NULL);
1353 if (ACPI_FAILURE(status))
1354 printk(KERN_WARNING " Error changing brightness\n");
1355 else {
1356 status =
1357 acpi_evaluate_object(NULL,
1358 hotk->methods->brightness_up,
1359 NULL, NULL);
1360 if (ACPI_FAILURE(status))
1361 printk(KERN_WARNING " Strange, error changing"
1362 " brightness\n");
1363 }
1364 }
1365
1366 asus_hotk_found = 1;
1367
1368 /* LED display is off by default */
1369 hotk->ledd_status = 0xFFF;
1370
1371 end:
1372 if (result)
1373 kfree(hotk);
1374
1375 return result;
1376 }
1377
1378 static int asus_hotk_remove(struct acpi_device *device, int type)
1379 {
1380 acpi_status status = 0;
1381
1382 if (!device || !acpi_driver_data(device))
1383 return -EINVAL;
1384
1385 status = acpi_remove_notify_handler(hotk->handle, ACPI_SYSTEM_NOTIFY,
1386 asus_hotk_notify);
1387 if (ACPI_FAILURE(status))
1388 printk(KERN_ERR "Asus ACPI: Error removing notify handler\n");
1389
1390 asus_hotk_remove_fs(device);
1391
1392 kfree(hotk);
1393
1394 return 0;
1395 }
1396
1397 static struct backlight_ops asus_backlight_data = {
1398 .get_brightness = read_brightness,
1399 .update_status = set_brightness_status,
1400 };
1401
1402 static void asus_acpi_exit(void)
1403 {
1404 if (asus_backlight_device)
1405 backlight_device_unregister(asus_backlight_device);
1406
1407 acpi_bus_unregister_driver(&asus_hotk_driver);
1408 remove_proc_entry(PROC_ASUS, acpi_root_dir);
1409
1410 return;
1411 }
1412
1413 static int __init asus_acpi_init(void)
1414 {
1415 int result;
1416
1417 if (acpi_disabled)
1418 return -ENODEV;
1419
1420 asus_proc_dir = proc_mkdir(PROC_ASUS, acpi_root_dir);
1421 if (!asus_proc_dir) {
1422 printk(KERN_ERR "Asus ACPI: Unable to create /proc entry\n");
1423 return -ENODEV;
1424 }
1425 asus_proc_dir->owner = THIS_MODULE;
1426
1427 result = acpi_bus_register_driver(&asus_hotk_driver);
1428 if (result < 0) {
1429 remove_proc_entry(PROC_ASUS, acpi_root_dir);
1430 return result;
1431 }
1432
1433 /*
1434 * This is a bit of a kludge. We only want this module loaded
1435 * for ASUS systems, but there's currently no way to probe the
1436 * ACPI namespace for ASUS HIDs. So we just return failure if
1437 * we didn't find one, which will cause the module to be
1438 * unloaded.
1439 */
1440 if (!asus_hotk_found) {
1441 acpi_bus_unregister_driver(&asus_hotk_driver);
1442 remove_proc_entry(PROC_ASUS, acpi_root_dir);
1443 return -ENODEV;
1444 }
1445
1446 asus_backlight_device = backlight_device_register("asus", NULL, NULL,
1447 &asus_backlight_data);
1448 if (IS_ERR(asus_backlight_device)) {
1449 printk(KERN_ERR "Could not register asus backlight device\n");
1450 asus_backlight_device = NULL;
1451 asus_acpi_exit();
1452 return -ENODEV;
1453 }
1454 asus_backlight_device->props.max_brightness = 15;
1455
1456 return 0;
1457 }
1458
1459 module_init(asus_acpi_init);
1460 module_exit(asus_acpi_exit);
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