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sched: make early bootup sched_clock() use safer
[wrt350n-kernel.git] / drivers / acpi / video.c
blob12cce69b5441e98a7bd8da23031dc250daaa88f1
1 /*
2 * video.c - ACPI Video Driver ($Revision:$)
3 *
4 * Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
5 * Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
6 * Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
7 *
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or (at
13 * your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
23 *
24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25 */
26
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/types.h>
31 #include <linux/list.h>
32 #include <linux/mutex.h>
33 #include <linux/proc_fs.h>
34 #include <linux/seq_file.h>
35 #include <linux/input.h>
36 #include <linux/backlight.h>
37 #include <linux/thermal.h>
38 #include <linux/video_output.h>
39 #include <asm/uaccess.h>
40
41 #include <acpi/acpi_bus.h>
42 #include <acpi/acpi_drivers.h>
43
44 #define ACPI_VIDEO_COMPONENT 0x08000000
45 #define ACPI_VIDEO_CLASS "video"
46 #define ACPI_VIDEO_BUS_NAME "Video Bus"
47 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
48 #define ACPI_VIDEO_NOTIFY_SWITCH 0x80
49 #define ACPI_VIDEO_NOTIFY_PROBE 0x81
50 #define ACPI_VIDEO_NOTIFY_CYCLE 0x82
51 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
52 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
53
54 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
55 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
56 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
57 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
58 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
59
60 #define ACPI_VIDEO_HEAD_INVALID (~0u - 1)
61 #define ACPI_VIDEO_HEAD_END (~0u)
62 #define MAX_NAME_LEN 20
63
64 #define ACPI_VIDEO_DISPLAY_CRT 1
65 #define ACPI_VIDEO_DISPLAY_TV 2
66 #define ACPI_VIDEO_DISPLAY_DVI 3
67 #define ACPI_VIDEO_DISPLAY_LCD 4
68
69 #define _COMPONENT ACPI_VIDEO_COMPONENT
70 ACPI_MODULE_NAME("video");
71
72 MODULE_AUTHOR("Bruno Ducrot");
73 MODULE_DESCRIPTION("ACPI Video Driver");
74 MODULE_LICENSE("GPL");
75
76 static int brightness_switch_enabled = 1;
77 module_param(brightness_switch_enabled, bool, 0644);
78
79 static int acpi_video_bus_add(struct acpi_device *device);
80 static int acpi_video_bus_remove(struct acpi_device *device, int type);
81 static int acpi_video_resume(struct acpi_device *device);
82
83 static const struct acpi_device_id video_device_ids[] = {
84 {ACPI_VIDEO_HID, 0},
85 {"", 0},
86 };
87 MODULE_DEVICE_TABLE(acpi, video_device_ids);
88
89 static struct acpi_driver acpi_video_bus = {
90 .name = "video",
91 .class = ACPI_VIDEO_CLASS,
92 .ids = video_device_ids,
93 .ops = {
94 .add = acpi_video_bus_add,
95 .remove = acpi_video_bus_remove,
96 .resume = acpi_video_resume,
97 },
98 };
99
100 struct acpi_video_bus_flags {
101 u8 multihead:1; /* can switch video heads */
102 u8 rom:1; /* can retrieve a video rom */
103 u8 post:1; /* can configure the head to */
104 u8 reserved:5;
105 };
106
107 struct acpi_video_bus_cap {
108 u8 _DOS:1; /*Enable/Disable output switching */
109 u8 _DOD:1; /*Enumerate all devices attached to display adapter */
110 u8 _ROM:1; /*Get ROM Data */
111 u8 _GPD:1; /*Get POST Device */
112 u8 _SPD:1; /*Set POST Device */
113 u8 _VPO:1; /*Video POST Options */
114 u8 reserved:2;
115 };
116
117 struct acpi_video_device_attrib {
118 u32 display_index:4; /* A zero-based instance of the Display */
119 u32 display_port_attachment:4; /*This field differentiates the display type */
120 u32 display_type:4; /*Describe the specific type in use */
121 u32 vendor_specific:4; /*Chipset Vendor Specific */
122 u32 bios_can_detect:1; /*BIOS can detect the device */
123 u32 depend_on_vga:1; /*Non-VGA output device whose power is related to
124 the VGA device. */
125 u32 pipe_id:3; /*For VGA multiple-head devices. */
126 u32 reserved:10; /*Must be 0 */
127 u32 device_id_scheme:1; /*Device ID Scheme */
128 };
129
130 struct acpi_video_enumerated_device {
131 union {
132 u32 int_val;
133 struct acpi_video_device_attrib attrib;
134 } value;
135 struct acpi_video_device *bind_info;
136 };
137
138 struct acpi_video_bus {
139 struct acpi_device *device;
140 u8 dos_setting;
141 struct acpi_video_enumerated_device *attached_array;
142 u8 attached_count;
143 struct acpi_video_bus_cap cap;
144 struct acpi_video_bus_flags flags;
145 struct list_head video_device_list;
146 struct mutex device_list_lock; /* protects video_device_list */
147 struct proc_dir_entry *dir;
148 struct input_dev *input;
149 char phys[32]; /* for input device */
150 };
151
152 struct acpi_video_device_flags {
153 u8 crt:1;
154 u8 lcd:1;
155 u8 tvout:1;
156 u8 dvi:1;
157 u8 bios:1;
158 u8 unknown:1;
159 u8 reserved:2;
160 };
161
162 struct acpi_video_device_cap {
163 u8 _ADR:1; /*Return the unique ID */
164 u8 _BCL:1; /*Query list of brightness control levels supported */
165 u8 _BCM:1; /*Set the brightness level */
166 u8 _BQC:1; /* Get current brightness level */
167 u8 _DDC:1; /*Return the EDID for this device */
168 u8 _DCS:1; /*Return status of output device */
169 u8 _DGS:1; /*Query graphics state */
170 u8 _DSS:1; /*Device state set */
171 };
172
173 struct acpi_video_device_brightness {
174 int curr;
175 int count;
176 int *levels;
177 };
178
179 struct acpi_video_device {
180 unsigned long device_id;
181 struct acpi_video_device_flags flags;
182 struct acpi_video_device_cap cap;
183 struct list_head entry;
184 struct acpi_video_bus *video;
185 struct acpi_device *dev;
186 struct acpi_video_device_brightness *brightness;
187 struct backlight_device *backlight;
188 struct thermal_cooling_device *cdev;
189 struct output_device *output_dev;
190 };
191
192 /* bus */
193 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
194 static struct file_operations acpi_video_bus_info_fops = {
195 .open = acpi_video_bus_info_open_fs,
196 .read = seq_read,
197 .llseek = seq_lseek,
198 .release = single_release,
199 };
200
201 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
202 static struct file_operations acpi_video_bus_ROM_fops = {
203 .open = acpi_video_bus_ROM_open_fs,
204 .read = seq_read,
205 .llseek = seq_lseek,
206 .release = single_release,
207 };
208
209 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
210 struct file *file);
211 static struct file_operations acpi_video_bus_POST_info_fops = {
212 .open = acpi_video_bus_POST_info_open_fs,
213 .read = seq_read,
214 .llseek = seq_lseek,
215 .release = single_release,
216 };
217
218 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
219 static struct file_operations acpi_video_bus_POST_fops = {
220 .open = acpi_video_bus_POST_open_fs,
221 .read = seq_read,
222 .llseek = seq_lseek,
223 .release = single_release,
224 };
225
226 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
227 static struct file_operations acpi_video_bus_DOS_fops = {
228 .open = acpi_video_bus_DOS_open_fs,
229 .read = seq_read,
230 .llseek = seq_lseek,
231 .release = single_release,
232 };
233
234 /* device */
235 static int acpi_video_device_info_open_fs(struct inode *inode,
236 struct file *file);
237 static struct file_operations acpi_video_device_info_fops = {
238 .open = acpi_video_device_info_open_fs,
239 .read = seq_read,
240 .llseek = seq_lseek,
241 .release = single_release,
242 };
243
244 static int acpi_video_device_state_open_fs(struct inode *inode,
245 struct file *file);
246 static struct file_operations acpi_video_device_state_fops = {
247 .open = acpi_video_device_state_open_fs,
248 .read = seq_read,
249 .llseek = seq_lseek,
250 .release = single_release,
251 };
252
253 static int acpi_video_device_brightness_open_fs(struct inode *inode,
254 struct file *file);
255 static struct file_operations acpi_video_device_brightness_fops = {
256 .open = acpi_video_device_brightness_open_fs,
257 .read = seq_read,
258 .llseek = seq_lseek,
259 .release = single_release,
260 };
261
262 static int acpi_video_device_EDID_open_fs(struct inode *inode,
263 struct file *file);
264 static struct file_operations acpi_video_device_EDID_fops = {
265 .open = acpi_video_device_EDID_open_fs,
266 .read = seq_read,
267 .llseek = seq_lseek,
268 .release = single_release,
269 };
270
271 static char device_decode[][30] = {
272 "motherboard VGA device",
273 "PCI VGA device",
274 "AGP VGA device",
275 "UNKNOWN",
276 };
277
278 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
279 static void acpi_video_device_rebind(struct acpi_video_bus *video);
280 static void acpi_video_device_bind(struct acpi_video_bus *video,
281 struct acpi_video_device *device);
282 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
283 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
284 int level);
285 static int acpi_video_device_lcd_get_level_current(
286 struct acpi_video_device *device,
287 unsigned long *level);
288 static int acpi_video_get_next_level(struct acpi_video_device *device,
289 u32 level_current, u32 event);
290 static void acpi_video_switch_brightness(struct acpi_video_device *device,
291 int event);
292 static int acpi_video_device_get_state(struct acpi_video_device *device,
293 unsigned long *state);
294 static int acpi_video_output_get(struct output_device *od);
295 static int acpi_video_device_set_state(struct acpi_video_device *device, int state);
296
297 /*backlight device sysfs support*/
298 static int acpi_video_get_brightness(struct backlight_device *bd)
299 {
300 unsigned long cur_level;
301 int i;
302 struct acpi_video_device *vd =
303 (struct acpi_video_device *)bl_get_data(bd);
304 acpi_video_device_lcd_get_level_current(vd, &cur_level);
305 for (i = 2; i < vd->brightness->count; i++) {
306 if (vd->brightness->levels[i] == cur_level)
307 /* The first two entries are special - see page 575
308 of the ACPI spec 3.0 */
309 return i-2;
310 }
311 return 0;
312 }
313
314 static int acpi_video_set_brightness(struct backlight_device *bd)
315 {
316 int request_level = bd->props.brightness+2;
317 struct acpi_video_device *vd =
318 (struct acpi_video_device *)bl_get_data(bd);
319 acpi_video_device_lcd_set_level(vd,
320 vd->brightness->levels[request_level]);
321 return 0;
322 }
323
324 static struct backlight_ops acpi_backlight_ops = {
325 .get_brightness = acpi_video_get_brightness,
326 .update_status = acpi_video_set_brightness,
327 };
328
329 /*video output device sysfs support*/
330 static int acpi_video_output_get(struct output_device *od)
331 {
332 unsigned long state;
333 struct acpi_video_device *vd =
334 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
335 acpi_video_device_get_state(vd, &state);
336 return (int)state;
337 }
338
339 static int acpi_video_output_set(struct output_device *od)
340 {
341 unsigned long state = od->request_state;
342 struct acpi_video_device *vd=
343 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
344 return acpi_video_device_set_state(vd, state);
345 }
346
347 static struct output_properties acpi_output_properties = {
348 .set_state = acpi_video_output_set,
349 .get_status = acpi_video_output_get,
350 };
351
352
353 /* thermal cooling device callbacks */
354 static int video_get_max_state(struct thermal_cooling_device *cdev, char *buf)
355 {
356 struct acpi_device *device = cdev->devdata;
357 struct acpi_video_device *video = acpi_driver_data(device);
358
359 return sprintf(buf, "%d\n", video->brightness->count - 3);
360 }
361
362 static int video_get_cur_state(struct thermal_cooling_device *cdev, char *buf)
363 {
364 struct acpi_device *device = cdev->devdata;
365 struct acpi_video_device *video = acpi_driver_data(device);
366 unsigned long level;
367 int state;
368
369 acpi_video_device_lcd_get_level_current(video, &level);
370 for (state = 2; state < video->brightness->count; state++)
371 if (level == video->brightness->levels[state])
372 return sprintf(buf, "%d\n",
373 video->brightness->count - state - 1);
374
375 return -EINVAL;
376 }
377
378 static int
379 video_set_cur_state(struct thermal_cooling_device *cdev, unsigned int state)
380 {
381 struct acpi_device *device = cdev->devdata;
382 struct acpi_video_device *video = acpi_driver_data(device);
383 int level;
384
385 if ( state >= video->brightness->count - 2)
386 return -EINVAL;
387
388 state = video->brightness->count - state;
389 level = video->brightness->levels[state -1];
390 return acpi_video_device_lcd_set_level(video, level);
391 }
392
393 static struct thermal_cooling_device_ops video_cooling_ops = {
394 .get_max_state = video_get_max_state,
395 .get_cur_state = video_get_cur_state,
396 .set_cur_state = video_set_cur_state,
397 };
398
399 /* --------------------------------------------------------------------------
400 Video Management
401 -------------------------------------------------------------------------- */
402
403 /* device */
404
405 static int
406 acpi_video_device_query(struct acpi_video_device *device, unsigned long *state)
407 {
408 int status;
409
410 status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
411
412 return status;
413 }
414
415 static int
416 acpi_video_device_get_state(struct acpi_video_device *device,
417 unsigned long *state)
418 {
419 int status;
420
421 status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
422
423 return status;
424 }
425
426 static int
427 acpi_video_device_set_state(struct acpi_video_device *device, int state)
428 {
429 int status;
430 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
431 struct acpi_object_list args = { 1, &arg0 };
432 unsigned long ret;
433
434
435 arg0.integer.value = state;
436 status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
437
438 return status;
439 }
440
441 static int
442 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
443 union acpi_object **levels)
444 {
445 int status;
446 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
447 union acpi_object *obj;
448
449
450 *levels = NULL;
451
452 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
453 if (!ACPI_SUCCESS(status))
454 return status;
455 obj = (union acpi_object *)buffer.pointer;
456 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
457 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
458 status = -EFAULT;
459 goto err;
460 }
461
462 *levels = obj;
463
464 return 0;
465
466 err:
467 kfree(buffer.pointer);
468
469 return status;
470 }
471
472 static int
473 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
474 {
475 int status = AE_OK;
476 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
477 struct acpi_object_list args = { 1, &arg0 };
478
479
480 arg0.integer.value = level;
481
482 if (device->cap._BCM)
483 status = acpi_evaluate_object(device->dev->handle, "_BCM",
484 &args, NULL);
485 device->brightness->curr = level;
486 return status;
487 }
488
489 static int
490 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
491 unsigned long *level)
492 {
493 if (device->cap._BQC)
494 return acpi_evaluate_integer(device->dev->handle, "_BQC", NULL,
495 level);
496 *level = device->brightness->curr;
497 return AE_OK;
498 }
499
500 static int
501 acpi_video_device_EDID(struct acpi_video_device *device,
502 union acpi_object **edid, ssize_t length)
503 {
504 int status;
505 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
506 union acpi_object *obj;
507 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
508 struct acpi_object_list args = { 1, &arg0 };
509
510
511 *edid = NULL;
512
513 if (!device)
514 return -ENODEV;
515 if (length == 128)
516 arg0.integer.value = 1;
517 else if (length == 256)
518 arg0.integer.value = 2;
519 else
520 return -EINVAL;
521
522 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
523 if (ACPI_FAILURE(status))
524 return -ENODEV;
525
526 obj = buffer.pointer;
527
528 if (obj && obj->type == ACPI_TYPE_BUFFER)
529 *edid = obj;
530 else {
531 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
532 status = -EFAULT;
533 kfree(obj);
534 }
535
536 return status;
537 }
538
539 /* bus */
540
541 static int
542 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
543 {
544 int status;
545 unsigned long tmp;
546 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
547 struct acpi_object_list args = { 1, &arg0 };
548
549
550 arg0.integer.value = option;
551
552 status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
553 if (ACPI_SUCCESS(status))
554 status = tmp ? (-EINVAL) : (AE_OK);
555
556 return status;
557 }
558
559 static int
560 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long *id)
561 {
562 int status;
563
564 status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
565
566 return status;
567 }
568
569 static int
570 acpi_video_bus_POST_options(struct acpi_video_bus *video,
571 unsigned long *options)
572 {
573 int status;
574
575 status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
576 *options &= 3;
577
578 return status;
579 }
580
581 /*
582 * Arg:
583 * video : video bus device pointer
584 * bios_flag :
585 * 0. The system BIOS should NOT automatically switch(toggle)
586 * the active display output.
587 * 1. The system BIOS should automatically switch (toggle) the
588 * active display output. No switch event.
589 * 2. The _DGS value should be locked.
590 * 3. The system BIOS should not automatically switch (toggle) the
591 * active display output, but instead generate the display switch
592 * event notify code.
593 * lcd_flag :
594 * 0. The system BIOS should automatically control the brightness level
595 * of the LCD when the power changes from AC to DC
596 * 1. The system BIOS should NOT automatically control the brightness
597 * level of the LCD when the power changes from AC to DC.
598 * Return Value:
599 * -1 wrong arg.
600 */
601
602 static int
603 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
604 {
605 acpi_integer status = 0;
606 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
607 struct acpi_object_list args = { 1, &arg0 };
608
609
610 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
611 status = -1;
612 goto Failed;
613 }
614 arg0.integer.value = (lcd_flag << 2) | bios_flag;
615 video->dos_setting = arg0.integer.value;
616 acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
617
618 Failed:
619 return status;
620 }
621
622 /*
623 * Arg:
624 * device : video output device (LCD, CRT, ..)
625 *
626 * Return Value:
627 * None
628 *
629 * Find out all required AML methods defined under the output
630 * device.
631 */
632
633 static void acpi_video_device_find_cap(struct acpi_video_device *device)
634 {
635 acpi_handle h_dummy1;
636 int i;
637 u32 max_level = 0;
638 union acpi_object *obj = NULL;
639 struct acpi_video_device_brightness *br = NULL;
640
641
642 memset(&device->cap, 0, sizeof(device->cap));
643
644 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
645 device->cap._ADR = 1;
646 }
647 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
648 device->cap._BCL = 1;
649 }
650 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
651 device->cap._BCM = 1;
652 }
653 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
654 device->cap._BQC = 1;
655 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
656 device->cap._DDC = 1;
657 }
658 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
659 device->cap._DCS = 1;
660 }
661 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
662 device->cap._DGS = 1;
663 }
664 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
665 device->cap._DSS = 1;
666 }
667
668 if (ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
669
670 if (obj->package.count >= 2) {
671 int count = 0;
672 union acpi_object *o;
673
674 br = kzalloc(sizeof(*br), GFP_KERNEL);
675 if (!br) {
676 printk(KERN_ERR "can't allocate memory\n");
677 } else {
678 br->levels = kmalloc(obj->package.count *
679 sizeof *(br->levels), GFP_KERNEL);
680 if (!br->levels)
681 goto out;
682
683 for (i = 0; i < obj->package.count; i++) {
684 o = (union acpi_object *)&obj->package.
685 elements[i];
686 if (o->type != ACPI_TYPE_INTEGER) {
687 printk(KERN_ERR PREFIX "Invalid data\n");
688 continue;
689 }
690 br->levels[count] = (u32) o->integer.value;
691
692 if (br->levels[count] > max_level)
693 max_level = br->levels[count];
694 count++;
695 }
696 out:
697 if (count < 2) {
698 kfree(br->levels);
699 kfree(br);
700 } else {
701 br->count = count;
702 device->brightness = br;
703 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
704 "found %d brightness levels\n",
705 count));
706 }
707 }
708 }
709
710 } else {
711 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available LCD brightness level\n"));
712 }
713
714 kfree(obj);
715
716 if (device->cap._BCL && device->cap._BCM && device->cap._BQC && max_level > 0){
717 int result;
718 static int count = 0;
719 char *name;
720 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
721 if (!name)
722 return;
723
724 sprintf(name, "acpi_video%d", count++);
725 device->backlight = backlight_device_register(name,
726 NULL, device, &acpi_backlight_ops);
727 device->backlight->props.max_brightness = device->brightness->count-3;
728 device->backlight->props.brightness = acpi_video_get_brightness(device->backlight);
729 backlight_update_status(device->backlight);
730 kfree(name);
731
732 device->cdev = thermal_cooling_device_register("LCD",
733 device->dev, &video_cooling_ops);
734 if (IS_ERR(device->cdev))
735 return;
736
737 if (device->cdev) {
738 printk(KERN_INFO PREFIX
739 "%s is registered as cooling_device%d\n",
740 device->dev->dev.bus_id, device->cdev->id);
741 result = sysfs_create_link(&device->dev->dev.kobj,
742 &device->cdev->device.kobj,
743 "thermal_cooling");
744 if (result)
745 printk(KERN_ERR PREFIX "Create sysfs link\n");
746 result = sysfs_create_link(&device->cdev->device.kobj,
747 &device->dev->dev.kobj,
748 "device");
749 if (result)
750 printk(KERN_ERR PREFIX "Create sysfs link\n");
751 }
752 }
753 if (device->cap._DCS && device->cap._DSS){
754 static int count = 0;
755 char *name;
756 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
757 if (!name)
758 return;
759 sprintf(name, "acpi_video%d", count++);
760 device->output_dev = video_output_register(name,
761 NULL, device, &acpi_output_properties);
762 kfree(name);
763 }
764 return;
765 }
766
767 /*
768 * Arg:
769 * device : video output device (VGA)
770 *
771 * Return Value:
772 * None
773 *
774 * Find out all required AML methods defined under the video bus device.
775 */
776
777 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
778 {
779 acpi_handle h_dummy1;
780
781 memset(&video->cap, 0, sizeof(video->cap));
782 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
783 video->cap._DOS = 1;
784 }
785 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
786 video->cap._DOD = 1;
787 }
788 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
789 video->cap._ROM = 1;
790 }
791 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
792 video->cap._GPD = 1;
793 }
794 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
795 video->cap._SPD = 1;
796 }
797 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
798 video->cap._VPO = 1;
799 }
800 }
801
802 /*
803 * Check whether the video bus device has required AML method to
804 * support the desired features
805 */
806
807 static int acpi_video_bus_check(struct acpi_video_bus *video)
808 {
809 acpi_status status = -ENOENT;
810 long device_id;
811 struct device *dev;
812 struct acpi_device *device;
813
814 if (!video)
815 return -EINVAL;
816
817 device = video->device;
818
819 status =
820 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
821
822 if (!ACPI_SUCCESS(status))
823 return -ENODEV;
824
825 /* We need to attempt to determine whether the _ADR refers to a
826 PCI device or not. There's no terribly good way to do this,
827 so the best we can hope for is to assume that there'll never
828 be a video device in the host bridge */
829 if (device_id >= 0x10000) {
830 /* It looks like a PCI device. Does it exist? */
831 dev = acpi_get_physical_device(device->handle);
832 } else {
833 /* It doesn't look like a PCI device. Does its parent
834 exist? */
835 acpi_handle phandle;
836 if (acpi_get_parent(device->handle, &phandle))
837 return -ENODEV;
838 dev = acpi_get_physical_device(phandle);
839 }
840 if (!dev)
841 return -ENODEV;
842 put_device(dev);
843
844 /* Since there is no HID, CID and so on for VGA driver, we have
845 * to check well known required nodes.
846 */
847
848 /* Does this device support video switching? */
849 if (video->cap._DOS) {
850 video->flags.multihead = 1;
851 status = 0;
852 }
853
854 /* Does this device support retrieving a video ROM? */
855 if (video->cap._ROM) {
856 video->flags.rom = 1;
857 status = 0;
858 }
859
860 /* Does this device support configuring which video device to POST? */
861 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
862 video->flags.post = 1;
863 status = 0;
864 }
865
866 return status;
867 }
868
869 /* --------------------------------------------------------------------------
870 FS Interface (/proc)
871 -------------------------------------------------------------------------- */
872
873 static struct proc_dir_entry *acpi_video_dir;
874
875 /* video devices */
876
877 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
878 {
879 struct acpi_video_device *dev = seq->private;
880
881
882 if (!dev)
883 goto end;
884
885 seq_printf(seq, "device_id: 0x%04x\n", (u32) dev->device_id);
886 seq_printf(seq, "type: ");
887 if (dev->flags.crt)
888 seq_printf(seq, "CRT\n");
889 else if (dev->flags.lcd)
890 seq_printf(seq, "LCD\n");
891 else if (dev->flags.tvout)
892 seq_printf(seq, "TVOUT\n");
893 else if (dev->flags.dvi)
894 seq_printf(seq, "DVI\n");
895 else
896 seq_printf(seq, "UNKNOWN\n");
897
898 seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
899
900 end:
901 return 0;
902 }
903
904 static int
905 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
906 {
907 return single_open(file, acpi_video_device_info_seq_show,
908 PDE(inode)->data);
909 }
910
911 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
912 {
913 int status;
914 struct acpi_video_device *dev = seq->private;
915 unsigned long state;
916
917
918 if (!dev)
919 goto end;
920
921 status = acpi_video_device_get_state(dev, &state);
922 seq_printf(seq, "state: ");
923 if (ACPI_SUCCESS(status))
924 seq_printf(seq, "0x%02lx\n", state);
925 else
926 seq_printf(seq, "<not supported>\n");
927
928 status = acpi_video_device_query(dev, &state);
929 seq_printf(seq, "query: ");
930 if (ACPI_SUCCESS(status))
931 seq_printf(seq, "0x%02lx\n", state);
932 else
933 seq_printf(seq, "<not supported>\n");
934
935 end:
936 return 0;
937 }
938
939 static int
940 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
941 {
942 return single_open(file, acpi_video_device_state_seq_show,
943 PDE(inode)->data);
944 }
945
946 static ssize_t
947 acpi_video_device_write_state(struct file *file,
948 const char __user * buffer,
949 size_t count, loff_t * data)
950 {
951 int status;
952 struct seq_file *m = file->private_data;
953 struct acpi_video_device *dev = m->private;
954 char str[12] = { 0 };
955 u32 state = 0;
956
957
958 if (!dev || count + 1 > sizeof str)
959 return -EINVAL;
960
961 if (copy_from_user(str, buffer, count))
962 return -EFAULT;
963
964 str[count] = 0;
965 state = simple_strtoul(str, NULL, 0);
966 state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
967
968 status = acpi_video_device_set_state(dev, state);
969
970 if (status)
971 return -EFAULT;
972
973 return count;
974 }
975
976 static int
977 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
978 {
979 struct acpi_video_device *dev = seq->private;
980 int i;
981
982
983 if (!dev || !dev->brightness) {
984 seq_printf(seq, "<not supported>\n");
985 return 0;
986 }
987
988 seq_printf(seq, "levels: ");
989 for (i = 0; i < dev->brightness->count; i++)
990 seq_printf(seq, " %d", dev->brightness->levels[i]);
991 seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
992
993 return 0;
994 }
995
996 static int
997 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
998 {
999 return single_open(file, acpi_video_device_brightness_seq_show,
1000 PDE(inode)->data);
1001 }
1002
1003 static ssize_t
1004 acpi_video_device_write_brightness(struct file *file,
1005 const char __user * buffer,
1006 size_t count, loff_t * data)
1007 {
1008 struct seq_file *m = file->private_data;
1009 struct acpi_video_device *dev = m->private;
1010 char str[5] = { 0 };
1011 unsigned int level = 0;
1012 int i;
1013
1014
1015 if (!dev || !dev->brightness || count + 1 > sizeof str)
1016 return -EINVAL;
1017
1018 if (copy_from_user(str, buffer, count))
1019 return -EFAULT;
1020
1021 str[count] = 0;
1022 level = simple_strtoul(str, NULL, 0);
1023
1024 if (level > 100)
1025 return -EFAULT;
1026
1027 /* validate through the list of available levels */
1028 for (i = 0; i < dev->brightness->count; i++)
1029 if (level == dev->brightness->levels[i]) {
1030 if (ACPI_SUCCESS
1031 (acpi_video_device_lcd_set_level(dev, level)))
1032 dev->brightness->curr = level;
1033 break;
1034 }
1035
1036 return count;
1037 }
1038
1039 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1040 {
1041 struct acpi_video_device *dev = seq->private;
1042 int status;
1043 int i;
1044 union acpi_object *edid = NULL;
1045
1046
1047 if (!dev)
1048 goto out;
1049
1050 status = acpi_video_device_EDID(dev, &edid, 128);
1051 if (ACPI_FAILURE(status)) {
1052 status = acpi_video_device_EDID(dev, &edid, 256);
1053 }
1054
1055 if (ACPI_FAILURE(status)) {
1056 goto out;
1057 }
1058
1059 if (edid && edid->type == ACPI_TYPE_BUFFER) {
1060 for (i = 0; i < edid->buffer.length; i++)
1061 seq_putc(seq, edid->buffer.pointer[i]);
1062 }
1063
1064 out:
1065 if (!edid)
1066 seq_printf(seq, "<not supported>\n");
1067 else
1068 kfree(edid);
1069
1070 return 0;
1071 }
1072
1073 static int
1074 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1075 {
1076 return single_open(file, acpi_video_device_EDID_seq_show,
1077 PDE(inode)->data);
1078 }
1079
1080 static int acpi_video_device_add_fs(struct acpi_device *device)
1081 {
1082 struct proc_dir_entry *entry = NULL;
1083 struct acpi_video_device *vid_dev;
1084
1085
1086 if (!device)
1087 return -ENODEV;
1088
1089 vid_dev = acpi_driver_data(device);
1090 if (!vid_dev)
1091 return -ENODEV;
1092
1093 if (!acpi_device_dir(device)) {
1094 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1095 vid_dev->video->dir);
1096 if (!acpi_device_dir(device))
1097 return -ENODEV;
1098 acpi_device_dir(device)->owner = THIS_MODULE;
1099 }
1100
1101 /* 'info' [R] */
1102 entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
1103 if (!entry)
1104 return -ENODEV;
1105 else {
1106 entry->proc_fops = &acpi_video_device_info_fops;
1107 entry->data = acpi_driver_data(device);
1108 entry->owner = THIS_MODULE;
1109 }
1110
1111 /* 'state' [R/W] */
1112 entry =
1113 create_proc_entry("state", S_IFREG | S_IRUGO | S_IWUSR,
1114 acpi_device_dir(device));
1115 if (!entry)
1116 return -ENODEV;
1117 else {
1118 acpi_video_device_state_fops.write = acpi_video_device_write_state;
1119 entry->proc_fops = &acpi_video_device_state_fops;
1120 entry->data = acpi_driver_data(device);
1121 entry->owner = THIS_MODULE;
1122 }
1123
1124 /* 'brightness' [R/W] */
1125 entry =
1126 create_proc_entry("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1127 acpi_device_dir(device));
1128 if (!entry)
1129 return -ENODEV;
1130 else {
1131 acpi_video_device_brightness_fops.write = acpi_video_device_write_brightness;
1132 entry->proc_fops = &acpi_video_device_brightness_fops;
1133 entry->data = acpi_driver_data(device);
1134 entry->owner = THIS_MODULE;
1135 }
1136
1137 /* 'EDID' [R] */
1138 entry = create_proc_entry("EDID", S_IRUGO, acpi_device_dir(device));
1139 if (!entry)
1140 return -ENODEV;
1141 else {
1142 entry->proc_fops = &acpi_video_device_EDID_fops;
1143 entry->data = acpi_driver_data(device);
1144 entry->owner = THIS_MODULE;
1145 }
1146
1147 return 0;
1148 }
1149
1150 static int acpi_video_device_remove_fs(struct acpi_device *device)
1151 {
1152 struct acpi_video_device *vid_dev;
1153
1154 vid_dev = acpi_driver_data(device);
1155 if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1156 return -ENODEV;
1157
1158 if (acpi_device_dir(device)) {
1159 remove_proc_entry("info", acpi_device_dir(device));
1160 remove_proc_entry("state", acpi_device_dir(device));
1161 remove_proc_entry("brightness", acpi_device_dir(device));
1162 remove_proc_entry("EDID", acpi_device_dir(device));
1163 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1164 acpi_device_dir(device) = NULL;
1165 }
1166
1167 return 0;
1168 }
1169
1170 /* video bus */
1171 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1172 {
1173 struct acpi_video_bus *video = seq->private;
1174
1175
1176 if (!video)
1177 goto end;
1178
1179 seq_printf(seq, "Switching heads: %s\n",
1180 video->flags.multihead ? "yes" : "no");
1181 seq_printf(seq, "Video ROM: %s\n",
1182 video->flags.rom ? "yes" : "no");
1183 seq_printf(seq, "Device to be POSTed on boot: %s\n",
1184 video->flags.post ? "yes" : "no");
1185
1186 end:
1187 return 0;
1188 }
1189
1190 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1191 {
1192 return single_open(file, acpi_video_bus_info_seq_show,
1193 PDE(inode)->data);
1194 }
1195
1196 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1197 {
1198 struct acpi_video_bus *video = seq->private;
1199
1200
1201 if (!video)
1202 goto end;
1203
1204 printk(KERN_INFO PREFIX "Please implement %s\n", __FUNCTION__);
1205 seq_printf(seq, "<TODO>\n");
1206
1207 end:
1208 return 0;
1209 }
1210
1211 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1212 {
1213 return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1214 }
1215
1216 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1217 {
1218 struct acpi_video_bus *video = seq->private;
1219 unsigned long options;
1220 int status;
1221
1222
1223 if (!video)
1224 goto end;
1225
1226 status = acpi_video_bus_POST_options(video, &options);
1227 if (ACPI_SUCCESS(status)) {
1228 if (!(options & 1)) {
1229 printk(KERN_WARNING PREFIX
1230 "The motherboard VGA device is not listed as a possible POST device.\n");
1231 printk(KERN_WARNING PREFIX
1232 "This indicates a BIOS bug. Please contact the manufacturer.\n");
1233 }
1234 printk("%lx\n", options);
1235 seq_printf(seq, "can POST: <integrated video>");
1236 if (options & 2)
1237 seq_printf(seq, " <PCI video>");
1238 if (options & 4)
1239 seq_printf(seq, " <AGP video>");
1240 seq_putc(seq, '\n');
1241 } else
1242 seq_printf(seq, "<not supported>\n");
1243 end:
1244 return 0;
1245 }
1246
1247 static int
1248 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1249 {
1250 return single_open(file, acpi_video_bus_POST_info_seq_show,
1251 PDE(inode)->data);
1252 }
1253
1254 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1255 {
1256 struct acpi_video_bus *video = seq->private;
1257 int status;
1258 unsigned long id;
1259
1260
1261 if (!video)
1262 goto end;
1263
1264 status = acpi_video_bus_get_POST(video, &id);
1265 if (!ACPI_SUCCESS(status)) {
1266 seq_printf(seq, "<not supported>\n");
1267 goto end;
1268 }
1269 seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1270
1271 end:
1272 return 0;
1273 }
1274
1275 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1276 {
1277 struct acpi_video_bus *video = seq->private;
1278
1279
1280 seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1281
1282 return 0;
1283 }
1284
1285 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1286 {
1287 return single_open(file, acpi_video_bus_POST_seq_show,
1288 PDE(inode)->data);
1289 }
1290
1291 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1292 {
1293 return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1294 }
1295
1296 static ssize_t
1297 acpi_video_bus_write_POST(struct file *file,
1298 const char __user * buffer,
1299 size_t count, loff_t * data)
1300 {
1301 int status;
1302 struct seq_file *m = file->private_data;
1303 struct acpi_video_bus *video = m->private;
1304 char str[12] = { 0 };
1305 unsigned long opt, options;
1306
1307
1308 if (!video || count + 1 > sizeof str)
1309 return -EINVAL;
1310
1311 status = acpi_video_bus_POST_options(video, &options);
1312 if (!ACPI_SUCCESS(status))
1313 return -EINVAL;
1314
1315 if (copy_from_user(str, buffer, count))
1316 return -EFAULT;
1317
1318 str[count] = 0;
1319 opt = strtoul(str, NULL, 0);
1320 if (opt > 3)
1321 return -EFAULT;
1322
1323 /* just in case an OEM 'forgot' the motherboard... */
1324 options |= 1;
1325
1326 if (options & (1ul << opt)) {
1327 status = acpi_video_bus_set_POST(video, opt);
1328 if (!ACPI_SUCCESS(status))
1329 return -EFAULT;
1330
1331 }
1332
1333 return count;
1334 }
1335
1336 static ssize_t
1337 acpi_video_bus_write_DOS(struct file *file,
1338 const char __user * buffer,
1339 size_t count, loff_t * data)
1340 {
1341 int status;
1342 struct seq_file *m = file->private_data;
1343 struct acpi_video_bus *video = m->private;
1344 char str[12] = { 0 };
1345 unsigned long opt;
1346
1347
1348 if (!video || count + 1 > sizeof str)
1349 return -EINVAL;
1350
1351 if (copy_from_user(str, buffer, count))
1352 return -EFAULT;
1353
1354 str[count] = 0;
1355 opt = strtoul(str, NULL, 0);
1356 if (opt > 7)
1357 return -EFAULT;
1358
1359 status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1360
1361 if (!ACPI_SUCCESS(status))
1362 return -EFAULT;
1363
1364 return count;
1365 }
1366
1367 static int acpi_video_bus_add_fs(struct acpi_device *device)
1368 {
1369 long device_id;
1370 int status;
1371 struct proc_dir_entry *entry = NULL;
1372 struct acpi_video_bus *video;
1373 struct device *dev;
1374
1375 status =
1376 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1377
1378 if (!ACPI_SUCCESS(status))
1379 return -ENODEV;
1380
1381 /* We need to attempt to determine whether the _ADR refers to a
1382 PCI device or not. There's no terribly good way to do this,
1383 so the best we can hope for is to assume that there'll never
1384 be a video device in the host bridge */
1385 if (device_id >= 0x10000) {
1386 /* It looks like a PCI device. Does it exist? */
1387 dev = acpi_get_physical_device(device->handle);
1388 } else {
1389 /* It doesn't look like a PCI device. Does its parent
1390 exist? */
1391 acpi_handle phandle;
1392 if (acpi_get_parent(device->handle, &phandle))
1393 return -ENODEV;
1394 dev = acpi_get_physical_device(phandle);
1395 }
1396 if (!dev)
1397 return -ENODEV;
1398 put_device(dev);
1399
1400
1401
1402 video = acpi_driver_data(device);
1403
1404 if (!acpi_device_dir(device)) {
1405 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1406 acpi_video_dir);
1407 if (!acpi_device_dir(device))
1408 return -ENODEV;
1409 video->dir = acpi_device_dir(device);
1410 acpi_device_dir(device)->owner = THIS_MODULE;
1411 }
1412
1413 /* 'info' [R] */
1414 entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
1415 if (!entry)
1416 return -ENODEV;
1417 else {
1418 entry->proc_fops = &acpi_video_bus_info_fops;
1419 entry->data = acpi_driver_data(device);
1420 entry->owner = THIS_MODULE;
1421 }
1422
1423 /* 'ROM' [R] */
1424 entry = create_proc_entry("ROM", S_IRUGO, acpi_device_dir(device));
1425 if (!entry)
1426 return -ENODEV;
1427 else {
1428 entry->proc_fops = &acpi_video_bus_ROM_fops;
1429 entry->data = acpi_driver_data(device);
1430 entry->owner = THIS_MODULE;
1431 }
1432
1433 /* 'POST_info' [R] */
1434 entry =
1435 create_proc_entry("POST_info", S_IRUGO, acpi_device_dir(device));
1436 if (!entry)
1437 return -ENODEV;
1438 else {
1439 entry->proc_fops = &acpi_video_bus_POST_info_fops;
1440 entry->data = acpi_driver_data(device);
1441 entry->owner = THIS_MODULE;
1442 }
1443
1444 /* 'POST' [R/W] */
1445 entry =
1446 create_proc_entry("POST", S_IFREG | S_IRUGO | S_IRUSR,
1447 acpi_device_dir(device));
1448 if (!entry)
1449 return -ENODEV;
1450 else {
1451 acpi_video_bus_POST_fops.write = acpi_video_bus_write_POST;
1452 entry->proc_fops = &acpi_video_bus_POST_fops;
1453 entry->data = acpi_driver_data(device);
1454 entry->owner = THIS_MODULE;
1455 }
1456
1457 /* 'DOS' [R/W] */
1458 entry =
1459 create_proc_entry("DOS", S_IFREG | S_IRUGO | S_IRUSR,
1460 acpi_device_dir(device));
1461 if (!entry)
1462 return -ENODEV;
1463 else {
1464 acpi_video_bus_DOS_fops.write = acpi_video_bus_write_DOS;
1465 entry->proc_fops = &acpi_video_bus_DOS_fops;
1466 entry->data = acpi_driver_data(device);
1467 entry->owner = THIS_MODULE;
1468 }
1469
1470 return 0;
1471 }
1472
1473 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1474 {
1475 struct acpi_video_bus *video;
1476
1477
1478 video = acpi_driver_data(device);
1479
1480 if (acpi_device_dir(device)) {
1481 remove_proc_entry("info", acpi_device_dir(device));
1482 remove_proc_entry("ROM", acpi_device_dir(device));
1483 remove_proc_entry("POST_info", acpi_device_dir(device));
1484 remove_proc_entry("POST", acpi_device_dir(device));
1485 remove_proc_entry("DOS", acpi_device_dir(device));
1486 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1487 acpi_device_dir(device) = NULL;
1488 }
1489
1490 return 0;
1491 }
1492
1493 /* --------------------------------------------------------------------------
1494 Driver Interface
1495 -------------------------------------------------------------------------- */
1496
1497 /* device interface */
1498 static struct acpi_video_device_attrib*
1499 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1500 {
1501 int count;
1502
1503 for(count = 0; count < video->attached_count; count++)
1504 if((video->attached_array[count].value.int_val & 0xffff) == device_id)
1505 return &(video->attached_array[count].value.attrib);
1506 return NULL;
1507 }
1508
1509 static int
1510 acpi_video_bus_get_one_device(struct acpi_device *device,
1511 struct acpi_video_bus *video)
1512 {
1513 unsigned long device_id;
1514 int status;
1515 struct acpi_video_device *data;
1516 struct acpi_video_device_attrib* attribute;
1517
1518 if (!device || !video)
1519 return -EINVAL;
1520
1521 status =
1522 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1523 if (ACPI_SUCCESS(status)) {
1524
1525 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1526 if (!data)
1527 return -ENOMEM;
1528
1529 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1530 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1531 acpi_driver_data(device) = data;
1532
1533 data->device_id = device_id;
1534 data->video = video;
1535 data->dev = device;
1536
1537 attribute = acpi_video_get_device_attr(video, device_id);
1538
1539 if((attribute != NULL) && attribute->device_id_scheme) {
1540 switch (attribute->display_type) {
1541 case ACPI_VIDEO_DISPLAY_CRT:
1542 data->flags.crt = 1;
1543 break;
1544 case ACPI_VIDEO_DISPLAY_TV:
1545 data->flags.tvout = 1;
1546 break;
1547 case ACPI_VIDEO_DISPLAY_DVI:
1548 data->flags.dvi = 1;
1549 break;
1550 case ACPI_VIDEO_DISPLAY_LCD:
1551 data->flags.lcd = 1;
1552 break;
1553 default:
1554 data->flags.unknown = 1;
1555 break;
1556 }
1557 if(attribute->bios_can_detect)
1558 data->flags.bios = 1;
1559 } else
1560 data->flags.unknown = 1;
1561
1562 acpi_video_device_bind(video, data);
1563 acpi_video_device_find_cap(data);
1564
1565 status = acpi_install_notify_handler(device->handle,
1566 ACPI_DEVICE_NOTIFY,
1567 acpi_video_device_notify,
1568 data);
1569 if (ACPI_FAILURE(status)) {
1570 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1571 "Error installing notify handler\n"));
1572 if(data->brightness)
1573 kfree(data->brightness->levels);
1574 kfree(data->brightness);
1575 kfree(data);
1576 return -ENODEV;
1577 }
1578
1579 mutex_lock(&video->device_list_lock);
1580 list_add_tail(&data->entry, &video->video_device_list);
1581 mutex_unlock(&video->device_list_lock);
1582
1583 acpi_video_device_add_fs(device);
1584
1585 return 0;
1586 }
1587
1588 return -ENOENT;
1589 }
1590
1591 /*
1592 * Arg:
1593 * video : video bus device
1594 *
1595 * Return:
1596 * none
1597 *
1598 * Enumerate the video device list of the video bus,
1599 * bind the ids with the corresponding video devices
1600 * under the video bus.
1601 */
1602
1603 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1604 {
1605 struct acpi_video_device *dev;
1606
1607 mutex_lock(&video->device_list_lock);
1608
1609 list_for_each_entry(dev, &video->video_device_list, entry)
1610 acpi_video_device_bind(video, dev);
1611
1612 mutex_unlock(&video->device_list_lock);
1613 }
1614
1615 /*
1616 * Arg:
1617 * video : video bus device
1618 * device : video output device under the video
1619 * bus
1620 *
1621 * Return:
1622 * none
1623 *
1624 * Bind the ids with the corresponding video devices
1625 * under the video bus.
1626 */
1627
1628 static void
1629 acpi_video_device_bind(struct acpi_video_bus *video,
1630 struct acpi_video_device *device)
1631 {
1632 int i;
1633
1634 #define IDS_VAL(i) video->attached_array[i].value.int_val
1635 #define IDS_BIND(i) video->attached_array[i].bind_info
1636
1637 for (i = 0; IDS_VAL(i) != ACPI_VIDEO_HEAD_INVALID &&
1638 i < video->attached_count; i++) {
1639 if (device->device_id == (IDS_VAL(i) & 0xffff)) {
1640 IDS_BIND(i) = device;
1641 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1642 }
1643 }
1644 #undef IDS_VAL
1645 #undef IDS_BIND
1646 }
1647
1648 /*
1649 * Arg:
1650 * video : video bus device
1651 *
1652 * Return:
1653 * < 0 : error
1654 *
1655 * Call _DOD to enumerate all devices attached to display adapter
1656 *
1657 */
1658
1659 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1660 {
1661 int status;
1662 int count;
1663 int i;
1664 struct acpi_video_enumerated_device *active_device_list;
1665 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1666 union acpi_object *dod = NULL;
1667 union acpi_object *obj;
1668
1669 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1670 if (!ACPI_SUCCESS(status)) {
1671 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1672 return status;
1673 }
1674
1675 dod = buffer.pointer;
1676 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1677 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1678 status = -EFAULT;
1679 goto out;
1680 }
1681
1682 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1683 dod->package.count));
1684
1685 active_device_list = kmalloc((1 +
1686 dod->package.count) *
1687 sizeof(struct
1688 acpi_video_enumerated_device),
1689 GFP_KERNEL);
1690
1691 if (!active_device_list) {
1692 status = -ENOMEM;
1693 goto out;
1694 }
1695
1696 count = 0;
1697 for (i = 0; i < dod->package.count; i++) {
1698 obj = &dod->package.elements[i];
1699
1700 if (obj->type != ACPI_TYPE_INTEGER) {
1701 printk(KERN_ERR PREFIX "Invalid _DOD data\n");
1702 active_device_list[i].value.int_val =
1703 ACPI_VIDEO_HEAD_INVALID;
1704 }
1705 active_device_list[i].value.int_val = obj->integer.value;
1706 active_device_list[i].bind_info = NULL;
1707 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1708 (int)obj->integer.value));
1709 count++;
1710 }
1711 active_device_list[count].value.int_val = ACPI_VIDEO_HEAD_END;
1712
1713 kfree(video->attached_array);
1714
1715 video->attached_array = active_device_list;
1716 video->attached_count = count;
1717 out:
1718 kfree(buffer.pointer);
1719 return status;
1720 }
1721
1722 static int
1723 acpi_video_get_next_level(struct acpi_video_device *device,
1724 u32 level_current, u32 event)
1725 {
1726 int min, max, min_above, max_below, i, l, delta = 255;
1727 max = max_below = 0;
1728 min = min_above = 255;
1729 /* Find closest level to level_current */
1730 for (i = 0; i < device->brightness->count; i++) {
1731 l = device->brightness->levels[i];
1732 if (abs(l - level_current) < abs(delta)) {
1733 delta = l - level_current;
1734 if (!delta)
1735 break;
1736 }
1737 }
1738 /* Ajust level_current to closest available level */
1739 level_current += delta;
1740 for (i = 0; i < device->brightness->count; i++) {
1741 l = device->brightness->levels[i];
1742 if (l < min)
1743 min = l;
1744 if (l > max)
1745 max = l;
1746 if (l < min_above && l > level_current)
1747 min_above = l;
1748 if (l > max_below && l < level_current)
1749 max_below = l;
1750 }
1751
1752 switch (event) {
1753 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1754 return (level_current < max) ? min_above : min;
1755 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1756 return (level_current < max) ? min_above : max;
1757 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1758 return (level_current > min) ? max_below : min;
1759 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1760 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1761 return 0;
1762 default:
1763 return level_current;
1764 }
1765 }
1766
1767 static void
1768 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1769 {
1770 unsigned long level_current, level_next;
1771 acpi_video_device_lcd_get_level_current(device, &level_current);
1772 level_next = acpi_video_get_next_level(device, level_current, event);
1773 acpi_video_device_lcd_set_level(device, level_next);
1774 }
1775
1776 static int
1777 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1778 struct acpi_device *device)
1779 {
1780 int status = 0;
1781 struct acpi_device *dev;
1782
1783 acpi_video_device_enumerate(video);
1784
1785 list_for_each_entry(dev, &device->children, node) {
1786
1787 status = acpi_video_bus_get_one_device(dev, video);
1788 if (ACPI_FAILURE(status)) {
1789 ACPI_EXCEPTION((AE_INFO, status, "Cant attach device"));
1790 continue;
1791 }
1792 }
1793 return status;
1794 }
1795
1796 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1797 {
1798 acpi_status status;
1799 struct acpi_video_bus *video;
1800
1801
1802 if (!device || !device->video)
1803 return -ENOENT;
1804
1805 video = device->video;
1806
1807 acpi_video_device_remove_fs(device->dev);
1808
1809 status = acpi_remove_notify_handler(device->dev->handle,
1810 ACPI_DEVICE_NOTIFY,
1811 acpi_video_device_notify);
1812 backlight_device_unregister(device->backlight);
1813 if (device->cdev) {
1814 sysfs_remove_link(&device->dev->dev.kobj,
1815 "thermal_cooling");
1816 sysfs_remove_link(&device->cdev->device.kobj,
1817 "device");
1818 thermal_cooling_device_unregister(device->cdev);
1819 device->cdev = NULL;
1820 }
1821 video_output_unregister(device->output_dev);
1822
1823 return 0;
1824 }
1825
1826 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1827 {
1828 int status;
1829 struct acpi_video_device *dev, *next;
1830
1831 mutex_lock(&video->device_list_lock);
1832
1833 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1834
1835 status = acpi_video_bus_put_one_device(dev);
1836 if (ACPI_FAILURE(status))
1837 printk(KERN_WARNING PREFIX
1838 "hhuuhhuu bug in acpi video driver.\n");
1839
1840 if (dev->brightness) {
1841 kfree(dev->brightness->levels);
1842 kfree(dev->brightness);
1843 }
1844 list_del(&dev->entry);
1845 kfree(dev);
1846 }
1847
1848 mutex_unlock(&video->device_list_lock);
1849
1850 return 0;
1851 }
1852
1853 /* acpi_video interface */
1854
1855 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1856 {
1857 return acpi_video_bus_DOS(video, 0, 0);
1858 }
1859
1860 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1861 {
1862 return acpi_video_bus_DOS(video, 0, 1);
1863 }
1864
1865 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
1866 {
1867 struct acpi_video_bus *video = data;
1868 struct acpi_device *device = NULL;
1869 struct input_dev *input;
1870 int keycode;
1871
1872 if (!video)
1873 return;
1874
1875 device = video->device;
1876 input = video->input;
1877
1878 switch (event) {
1879 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1880 * most likely via hotkey. */
1881 acpi_bus_generate_proc_event(device, event, 0);
1882 keycode = KEY_SWITCHVIDEOMODE;
1883 break;
1884
1885 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1886 * connector. */
1887 acpi_video_device_enumerate(video);
1888 acpi_video_device_rebind(video);
1889 acpi_bus_generate_proc_event(device, event, 0);
1890 keycode = KEY_SWITCHVIDEOMODE;
1891 break;
1892
1893 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1894 acpi_bus_generate_proc_event(device, event, 0);
1895 keycode = KEY_SWITCHVIDEOMODE;
1896 break;
1897 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1898 acpi_bus_generate_proc_event(device, event, 0);
1899 keycode = KEY_VIDEO_NEXT;
1900 break;
1901 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1902 acpi_bus_generate_proc_event(device, event, 0);
1903 keycode = KEY_VIDEO_PREV;
1904 break;
1905
1906 default:
1907 keycode = KEY_UNKNOWN;
1908 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1909 "Unsupported event [0x%x]\n", event));
1910 break;
1911 }
1912
1913 acpi_notifier_call_chain(device, event, 0);
1914 input_report_key(input, keycode, 1);
1915 input_sync(input);
1916 input_report_key(input, keycode, 0);
1917 input_sync(input);
1918
1919 return;
1920 }
1921
1922 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1923 {
1924 struct acpi_video_device *video_device = data;
1925 struct acpi_device *device = NULL;
1926 struct acpi_video_bus *bus;
1927 struct input_dev *input;
1928 int keycode;
1929
1930 if (!video_device)
1931 return;
1932
1933 device = video_device->dev;
1934 bus = video_device->video;
1935 input = bus->input;
1936
1937 switch (event) {
1938 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1939 if (brightness_switch_enabled)
1940 acpi_video_switch_brightness(video_device, event);
1941 acpi_bus_generate_proc_event(device, event, 0);
1942 keycode = KEY_BRIGHTNESS_CYCLE;
1943 break;
1944 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1945 if (brightness_switch_enabled)
1946 acpi_video_switch_brightness(video_device, event);
1947 acpi_bus_generate_proc_event(device, event, 0);
1948 keycode = KEY_BRIGHTNESSUP;
1949 break;
1950 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1951 if (brightness_switch_enabled)
1952 acpi_video_switch_brightness(video_device, event);
1953 acpi_bus_generate_proc_event(device, event, 0);
1954 keycode = KEY_BRIGHTNESSDOWN;
1955 break;
1956 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
1957 if (brightness_switch_enabled)
1958 acpi_video_switch_brightness(video_device, event);
1959 acpi_bus_generate_proc_event(device, event, 0);
1960 keycode = KEY_BRIGHTNESS_ZERO;
1961 break;
1962 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1963 if (brightness_switch_enabled)
1964 acpi_video_switch_brightness(video_device, event);
1965 acpi_bus_generate_proc_event(device, event, 0);
1966 keycode = KEY_DISPLAY_OFF;
1967 break;
1968 default:
1969 keycode = KEY_UNKNOWN;
1970 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1971 "Unsupported event [0x%x]\n", event));
1972 break;
1973 }
1974
1975 acpi_notifier_call_chain(device, event, 0);
1976 input_report_key(input, keycode, 1);
1977 input_sync(input);
1978 input_report_key(input, keycode, 0);
1979 input_sync(input);
1980
1981 return;
1982 }
1983
1984 static int instance;
1985 static int acpi_video_resume(struct acpi_device *device)
1986 {
1987 struct acpi_video_bus *video;
1988 struct acpi_video_device *video_device;
1989 int i;
1990
1991 if (!device || !acpi_driver_data(device))
1992 return -EINVAL;
1993
1994 video = acpi_driver_data(device);
1995
1996 for (i = 0; i < video->attached_count; i++) {
1997 video_device = video->attached_array[i].bind_info;
1998 if (video_device && video_device->backlight)
1999 acpi_video_set_brightness(video_device->backlight);
2000 }
2001 return AE_OK;
2002 }
2003
2004 static int acpi_video_bus_add(struct acpi_device *device)
2005 {
2006 acpi_status status;
2007 struct acpi_video_bus *video;
2008 struct input_dev *input;
2009 int error;
2010
2011 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2012 if (!video)
2013 return -ENOMEM;
2014
2015 /* a hack to fix the duplicate name "VID" problem on T61 */
2016 if (!strcmp(device->pnp.bus_id, "VID")) {
2017 if (instance)
2018 device->pnp.bus_id[3] = '0' + instance;
2019 instance ++;
2020 }
2021
2022 video->device = device;
2023 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2024 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2025 acpi_driver_data(device) = video;
2026
2027 acpi_video_bus_find_cap(video);
2028 error = acpi_video_bus_check(video);
2029 if (error)
2030 goto err_free_video;
2031
2032 error = acpi_video_bus_add_fs(device);
2033 if (error)
2034 goto err_free_video;
2035
2036 mutex_init(&video->device_list_lock);
2037 INIT_LIST_HEAD(&video->video_device_list);
2038
2039 acpi_video_bus_get_devices(video, device);
2040 acpi_video_bus_start_devices(video);
2041
2042 status = acpi_install_notify_handler(device->handle,
2043 ACPI_DEVICE_NOTIFY,
2044 acpi_video_bus_notify, video);
2045 if (ACPI_FAILURE(status)) {
2046 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
2047 "Error installing notify handler\n"));
2048 error = -ENODEV;
2049 goto err_stop_video;
2050 }
2051
2052 video->input = input = input_allocate_device();
2053 if (!input) {
2054 error = -ENOMEM;
2055 goto err_uninstall_notify;
2056 }
2057
2058 snprintf(video->phys, sizeof(video->phys),
2059 "%s/video/input0", acpi_device_hid(video->device));
2060
2061 input->name = acpi_device_name(video->device);
2062 input->phys = video->phys;
2063 input->id.bustype = BUS_HOST;
2064 input->id.product = 0x06;
2065 input->dev.parent = &device->dev;
2066 input->evbit[0] = BIT(EV_KEY);
2067 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2068 set_bit(KEY_VIDEO_NEXT, input->keybit);
2069 set_bit(KEY_VIDEO_PREV, input->keybit);
2070 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2071 set_bit(KEY_BRIGHTNESSUP, input->keybit);
2072 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2073 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2074 set_bit(KEY_DISPLAY_OFF, input->keybit);
2075 set_bit(KEY_UNKNOWN, input->keybit);
2076
2077 error = input_register_device(input);
2078 if (error)
2079 goto err_free_input_dev;
2080
2081 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
2082 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2083 video->flags.multihead ? "yes" : "no",
2084 video->flags.rom ? "yes" : "no",
2085 video->flags.post ? "yes" : "no");
2086
2087 return 0;
2088
2089 err_free_input_dev:
2090 input_free_device(input);
2091 err_uninstall_notify:
2092 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
2093 acpi_video_bus_notify);
2094 err_stop_video:
2095 acpi_video_bus_stop_devices(video);
2096 acpi_video_bus_put_devices(video);
2097 kfree(video->attached_array);
2098 acpi_video_bus_remove_fs(device);
2099 err_free_video:
2100 kfree(video);
2101 acpi_driver_data(device) = NULL;
2102
2103 return error;
2104 }
2105
2106 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2107 {
2108 acpi_status status = 0;
2109 struct acpi_video_bus *video = NULL;
2110
2111
2112 if (!device || !acpi_driver_data(device))
2113 return -EINVAL;
2114
2115 video = acpi_driver_data(device);
2116
2117 acpi_video_bus_stop_devices(video);
2118
2119 status = acpi_remove_notify_handler(video->device->handle,
2120 ACPI_DEVICE_NOTIFY,
2121 acpi_video_bus_notify);
2122
2123 acpi_video_bus_put_devices(video);
2124 acpi_video_bus_remove_fs(device);
2125
2126 input_unregister_device(video->input);
2127 kfree(video->attached_array);
2128 kfree(video);
2129
2130 return 0;
2131 }
2132
2133 static int __init acpi_video_init(void)
2134 {
2135 int result = 0;
2136
2137
2138 /*
2139 acpi_dbg_level = 0xFFFFFFFF;
2140 acpi_dbg_layer = 0x08000000;
2141 */
2142
2143 acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2144 if (!acpi_video_dir)
2145 return -ENODEV;
2146 acpi_video_dir->owner = THIS_MODULE;
2147
2148 result = acpi_bus_register_driver(&acpi_video_bus);
2149 if (result < 0) {
2150 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2151 return -ENODEV;
2152 }
2153
2154 return 0;
2155 }
2156
2157 static void __exit acpi_video_exit(void)
2158 {
2159
2160 acpi_bus_unregister_driver(&acpi_video_bus);
2161
2162 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2163
2164 return;
2165 }
2166
2167 module_init(acpi_video_init);
2168 module_exit(acpi_video_exit);
WRT350N Kernel Patches