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proc: remove useless check on symlink removal
[linux-2.6/openmoko-kernel.git] / drivers / acpi / video.c
blob7f714fa2a4547d284323d85441e60a9c6b61600f
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 (device->cdev) {
735 printk(KERN_INFO PREFIX
736 "%s is registered as cooling_device%d\n",
737 device->dev->dev.bus_id, device->cdev->id);
738 result = sysfs_create_link(&device->dev->dev.kobj,
739 &device->cdev->device.kobj,
740 "thermal_cooling");
741 if (result)
742 printk(KERN_ERR PREFIX "Create sysfs link\n");
743 result = sysfs_create_link(&device->cdev->device.kobj,
744 &device->dev->dev.kobj,
745 "device");
746 if (result)
747 printk(KERN_ERR PREFIX "Create sysfs link\n");
748 }
749 }
750 if (device->cap._DCS && device->cap._DSS){
751 static int count = 0;
752 char *name;
753 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
754 if (!name)
755 return;
756 sprintf(name, "acpi_video%d", count++);
757 device->output_dev = video_output_register(name,
758 NULL, device, &acpi_output_properties);
759 kfree(name);
760 }
761 return;
762 }
763
764 /*
765 * Arg:
766 * device : video output device (VGA)
767 *
768 * Return Value:
769 * None
770 *
771 * Find out all required AML methods defined under the video bus device.
772 */
773
774 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
775 {
776 acpi_handle h_dummy1;
777
778 memset(&video->cap, 0, sizeof(video->cap));
779 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
780 video->cap._DOS = 1;
781 }
782 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
783 video->cap._DOD = 1;
784 }
785 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
786 video->cap._ROM = 1;
787 }
788 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
789 video->cap._GPD = 1;
790 }
791 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
792 video->cap._SPD = 1;
793 }
794 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
795 video->cap._VPO = 1;
796 }
797 }
798
799 /*
800 * Check whether the video bus device has required AML method to
801 * support the desired features
802 */
803
804 static int acpi_video_bus_check(struct acpi_video_bus *video)
805 {
806 acpi_status status = -ENOENT;
807 long device_id;
808 struct device *dev;
809 struct acpi_device *device;
810
811 if (!video)
812 return -EINVAL;
813
814 device = video->device;
815
816 status =
817 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
818
819 if (!ACPI_SUCCESS(status))
820 return -ENODEV;
821
822 /* We need to attempt to determine whether the _ADR refers to a
823 PCI device or not. There's no terribly good way to do this,
824 so the best we can hope for is to assume that there'll never
825 be a video device in the host bridge */
826 if (device_id >= 0x10000) {
827 /* It looks like a PCI device. Does it exist? */
828 dev = acpi_get_physical_device(device->handle);
829 } else {
830 /* It doesn't look like a PCI device. Does its parent
831 exist? */
832 acpi_handle phandle;
833 if (acpi_get_parent(device->handle, &phandle))
834 return -ENODEV;
835 dev = acpi_get_physical_device(phandle);
836 }
837 if (!dev)
838 return -ENODEV;
839 put_device(dev);
840
841 /* Since there is no HID, CID and so on for VGA driver, we have
842 * to check well known required nodes.
843 */
844
845 /* Does this device support video switching? */
846 if (video->cap._DOS) {
847 video->flags.multihead = 1;
848 status = 0;
849 }
850
851 /* Does this device support retrieving a video ROM? */
852 if (video->cap._ROM) {
853 video->flags.rom = 1;
854 status = 0;
855 }
856
857 /* Does this device support configuring which video device to POST? */
858 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
859 video->flags.post = 1;
860 status = 0;
861 }
862
863 return status;
864 }
865
866 /* --------------------------------------------------------------------------
867 FS Interface (/proc)
868 -------------------------------------------------------------------------- */
869
870 static struct proc_dir_entry *acpi_video_dir;
871
872 /* video devices */
873
874 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
875 {
876 struct acpi_video_device *dev = seq->private;
877
878
879 if (!dev)
880 goto end;
881
882 seq_printf(seq, "device_id: 0x%04x\n", (u32) dev->device_id);
883 seq_printf(seq, "type: ");
884 if (dev->flags.crt)
885 seq_printf(seq, "CRT\n");
886 else if (dev->flags.lcd)
887 seq_printf(seq, "LCD\n");
888 else if (dev->flags.tvout)
889 seq_printf(seq, "TVOUT\n");
890 else if (dev->flags.dvi)
891 seq_printf(seq, "DVI\n");
892 else
893 seq_printf(seq, "UNKNOWN\n");
894
895 seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
896
897 end:
898 return 0;
899 }
900
901 static int
902 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
903 {
904 return single_open(file, acpi_video_device_info_seq_show,
905 PDE(inode)->data);
906 }
907
908 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
909 {
910 int status;
911 struct acpi_video_device *dev = seq->private;
912 unsigned long state;
913
914
915 if (!dev)
916 goto end;
917
918 status = acpi_video_device_get_state(dev, &state);
919 seq_printf(seq, "state: ");
920 if (ACPI_SUCCESS(status))
921 seq_printf(seq, "0x%02lx\n", state);
922 else
923 seq_printf(seq, "<not supported>\n");
924
925 status = acpi_video_device_query(dev, &state);
926 seq_printf(seq, "query: ");
927 if (ACPI_SUCCESS(status))
928 seq_printf(seq, "0x%02lx\n", state);
929 else
930 seq_printf(seq, "<not supported>\n");
931
932 end:
933 return 0;
934 }
935
936 static int
937 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
938 {
939 return single_open(file, acpi_video_device_state_seq_show,
940 PDE(inode)->data);
941 }
942
943 static ssize_t
944 acpi_video_device_write_state(struct file *file,
945 const char __user * buffer,
946 size_t count, loff_t * data)
947 {
948 int status;
949 struct seq_file *m = file->private_data;
950 struct acpi_video_device *dev = m->private;
951 char str[12] = { 0 };
952 u32 state = 0;
953
954
955 if (!dev || count + 1 > sizeof str)
956 return -EINVAL;
957
958 if (copy_from_user(str, buffer, count))
959 return -EFAULT;
960
961 str[count] = 0;
962 state = simple_strtoul(str, NULL, 0);
963 state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
964
965 status = acpi_video_device_set_state(dev, state);
966
967 if (status)
968 return -EFAULT;
969
970 return count;
971 }
972
973 static int
974 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
975 {
976 struct acpi_video_device *dev = seq->private;
977 int i;
978
979
980 if (!dev || !dev->brightness) {
981 seq_printf(seq, "<not supported>\n");
982 return 0;
983 }
984
985 seq_printf(seq, "levels: ");
986 for (i = 0; i < dev->brightness->count; i++)
987 seq_printf(seq, " %d", dev->brightness->levels[i]);
988 seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
989
990 return 0;
991 }
992
993 static int
994 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
995 {
996 return single_open(file, acpi_video_device_brightness_seq_show,
997 PDE(inode)->data);
998 }
999
1000 static ssize_t
1001 acpi_video_device_write_brightness(struct file *file,
1002 const char __user * buffer,
1003 size_t count, loff_t * data)
1004 {
1005 struct seq_file *m = file->private_data;
1006 struct acpi_video_device *dev = m->private;
1007 char str[5] = { 0 };
1008 unsigned int level = 0;
1009 int i;
1010
1011
1012 if (!dev || !dev->brightness || count + 1 > sizeof str)
1013 return -EINVAL;
1014
1015 if (copy_from_user(str, buffer, count))
1016 return -EFAULT;
1017
1018 str[count] = 0;
1019 level = simple_strtoul(str, NULL, 0);
1020
1021 if (level > 100)
1022 return -EFAULT;
1023
1024 /* validate through the list of available levels */
1025 for (i = 0; i < dev->brightness->count; i++)
1026 if (level == dev->brightness->levels[i]) {
1027 if (ACPI_SUCCESS
1028 (acpi_video_device_lcd_set_level(dev, level)))
1029 dev->brightness->curr = level;
1030 break;
1031 }
1032
1033 return count;
1034 }
1035
1036 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1037 {
1038 struct acpi_video_device *dev = seq->private;
1039 int status;
1040 int i;
1041 union acpi_object *edid = NULL;
1042
1043
1044 if (!dev)
1045 goto out;
1046
1047 status = acpi_video_device_EDID(dev, &edid, 128);
1048 if (ACPI_FAILURE(status)) {
1049 status = acpi_video_device_EDID(dev, &edid, 256);
1050 }
1051
1052 if (ACPI_FAILURE(status)) {
1053 goto out;
1054 }
1055
1056 if (edid && edid->type == ACPI_TYPE_BUFFER) {
1057 for (i = 0; i < edid->buffer.length; i++)
1058 seq_putc(seq, edid->buffer.pointer[i]);
1059 }
1060
1061 out:
1062 if (!edid)
1063 seq_printf(seq, "<not supported>\n");
1064 else
1065 kfree(edid);
1066
1067 return 0;
1068 }
1069
1070 static int
1071 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1072 {
1073 return single_open(file, acpi_video_device_EDID_seq_show,
1074 PDE(inode)->data);
1075 }
1076
1077 static int acpi_video_device_add_fs(struct acpi_device *device)
1078 {
1079 struct proc_dir_entry *entry = NULL;
1080 struct acpi_video_device *vid_dev;
1081
1082
1083 if (!device)
1084 return -ENODEV;
1085
1086 vid_dev = acpi_driver_data(device);
1087 if (!vid_dev)
1088 return -ENODEV;
1089
1090 if (!acpi_device_dir(device)) {
1091 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1092 vid_dev->video->dir);
1093 if (!acpi_device_dir(device))
1094 return -ENODEV;
1095 acpi_device_dir(device)->owner = THIS_MODULE;
1096 }
1097
1098 /* 'info' [R] */
1099 entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
1100 if (!entry)
1101 return -ENODEV;
1102 else {
1103 entry->proc_fops = &acpi_video_device_info_fops;
1104 entry->data = acpi_driver_data(device);
1105 entry->owner = THIS_MODULE;
1106 }
1107
1108 /* 'state' [R/W] */
1109 entry =
1110 create_proc_entry("state", S_IFREG | S_IRUGO | S_IWUSR,
1111 acpi_device_dir(device));
1112 if (!entry)
1113 return -ENODEV;
1114 else {
1115 acpi_video_device_state_fops.write = acpi_video_device_write_state;
1116 entry->proc_fops = &acpi_video_device_state_fops;
1117 entry->data = acpi_driver_data(device);
1118 entry->owner = THIS_MODULE;
1119 }
1120
1121 /* 'brightness' [R/W] */
1122 entry =
1123 create_proc_entry("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1124 acpi_device_dir(device));
1125 if (!entry)
1126 return -ENODEV;
1127 else {
1128 acpi_video_device_brightness_fops.write = acpi_video_device_write_brightness;
1129 entry->proc_fops = &acpi_video_device_brightness_fops;
1130 entry->data = acpi_driver_data(device);
1131 entry->owner = THIS_MODULE;
1132 }
1133
1134 /* 'EDID' [R] */
1135 entry = create_proc_entry("EDID", S_IRUGO, acpi_device_dir(device));
1136 if (!entry)
1137 return -ENODEV;
1138 else {
1139 entry->proc_fops = &acpi_video_device_EDID_fops;
1140 entry->data = acpi_driver_data(device);
1141 entry->owner = THIS_MODULE;
1142 }
1143
1144 return 0;
1145 }
1146
1147 static int acpi_video_device_remove_fs(struct acpi_device *device)
1148 {
1149 struct acpi_video_device *vid_dev;
1150
1151 vid_dev = acpi_driver_data(device);
1152 if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1153 return -ENODEV;
1154
1155 if (acpi_device_dir(device)) {
1156 remove_proc_entry("info", acpi_device_dir(device));
1157 remove_proc_entry("state", acpi_device_dir(device));
1158 remove_proc_entry("brightness", acpi_device_dir(device));
1159 remove_proc_entry("EDID", acpi_device_dir(device));
1160 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1161 acpi_device_dir(device) = NULL;
1162 }
1163
1164 return 0;
1165 }
1166
1167 /* video bus */
1168 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1169 {
1170 struct acpi_video_bus *video = seq->private;
1171
1172
1173 if (!video)
1174 goto end;
1175
1176 seq_printf(seq, "Switching heads: %s\n",
1177 video->flags.multihead ? "yes" : "no");
1178 seq_printf(seq, "Video ROM: %s\n",
1179 video->flags.rom ? "yes" : "no");
1180 seq_printf(seq, "Device to be POSTed on boot: %s\n",
1181 video->flags.post ? "yes" : "no");
1182
1183 end:
1184 return 0;
1185 }
1186
1187 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1188 {
1189 return single_open(file, acpi_video_bus_info_seq_show,
1190 PDE(inode)->data);
1191 }
1192
1193 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1194 {
1195 struct acpi_video_bus *video = seq->private;
1196
1197
1198 if (!video)
1199 goto end;
1200
1201 printk(KERN_INFO PREFIX "Please implement %s\n", __FUNCTION__);
1202 seq_printf(seq, "<TODO>\n");
1203
1204 end:
1205 return 0;
1206 }
1207
1208 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1209 {
1210 return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1211 }
1212
1213 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1214 {
1215 struct acpi_video_bus *video = seq->private;
1216 unsigned long options;
1217 int status;
1218
1219
1220 if (!video)
1221 goto end;
1222
1223 status = acpi_video_bus_POST_options(video, &options);
1224 if (ACPI_SUCCESS(status)) {
1225 if (!(options & 1)) {
1226 printk(KERN_WARNING PREFIX
1227 "The motherboard VGA device is not listed as a possible POST device.\n");
1228 printk(KERN_WARNING PREFIX
1229 "This indicates a BIOS bug. Please contact the manufacturer.\n");
1230 }
1231 printk("%lx\n", options);
1232 seq_printf(seq, "can POST: <integrated video>");
1233 if (options & 2)
1234 seq_printf(seq, " <PCI video>");
1235 if (options & 4)
1236 seq_printf(seq, " <AGP video>");
1237 seq_putc(seq, '\n');
1238 } else
1239 seq_printf(seq, "<not supported>\n");
1240 end:
1241 return 0;
1242 }
1243
1244 static int
1245 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1246 {
1247 return single_open(file, acpi_video_bus_POST_info_seq_show,
1248 PDE(inode)->data);
1249 }
1250
1251 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1252 {
1253 struct acpi_video_bus *video = seq->private;
1254 int status;
1255 unsigned long id;
1256
1257
1258 if (!video)
1259 goto end;
1260
1261 status = acpi_video_bus_get_POST(video, &id);
1262 if (!ACPI_SUCCESS(status)) {
1263 seq_printf(seq, "<not supported>\n");
1264 goto end;
1265 }
1266 seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1267
1268 end:
1269 return 0;
1270 }
1271
1272 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1273 {
1274 struct acpi_video_bus *video = seq->private;
1275
1276
1277 seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1278
1279 return 0;
1280 }
1281
1282 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1283 {
1284 return single_open(file, acpi_video_bus_POST_seq_show,
1285 PDE(inode)->data);
1286 }
1287
1288 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1289 {
1290 return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1291 }
1292
1293 static ssize_t
1294 acpi_video_bus_write_POST(struct file *file,
1295 const char __user * buffer,
1296 size_t count, loff_t * data)
1297 {
1298 int status;
1299 struct seq_file *m = file->private_data;
1300 struct acpi_video_bus *video = m->private;
1301 char str[12] = { 0 };
1302 unsigned long opt, options;
1303
1304
1305 if (!video || count + 1 > sizeof str)
1306 return -EINVAL;
1307
1308 status = acpi_video_bus_POST_options(video, &options);
1309 if (!ACPI_SUCCESS(status))
1310 return -EINVAL;
1311
1312 if (copy_from_user(str, buffer, count))
1313 return -EFAULT;
1314
1315 str[count] = 0;
1316 opt = strtoul(str, NULL, 0);
1317 if (opt > 3)
1318 return -EFAULT;
1319
1320 /* just in case an OEM 'forgot' the motherboard... */
1321 options |= 1;
1322
1323 if (options & (1ul << opt)) {
1324 status = acpi_video_bus_set_POST(video, opt);
1325 if (!ACPI_SUCCESS(status))
1326 return -EFAULT;
1327
1328 }
1329
1330 return count;
1331 }
1332
1333 static ssize_t
1334 acpi_video_bus_write_DOS(struct file *file,
1335 const char __user * buffer,
1336 size_t count, loff_t * data)
1337 {
1338 int status;
1339 struct seq_file *m = file->private_data;
1340 struct acpi_video_bus *video = m->private;
1341 char str[12] = { 0 };
1342 unsigned long opt;
1343
1344
1345 if (!video || count + 1 > sizeof str)
1346 return -EINVAL;
1347
1348 if (copy_from_user(str, buffer, count))
1349 return -EFAULT;
1350
1351 str[count] = 0;
1352 opt = strtoul(str, NULL, 0);
1353 if (opt > 7)
1354 return -EFAULT;
1355
1356 status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1357
1358 if (!ACPI_SUCCESS(status))
1359 return -EFAULT;
1360
1361 return count;
1362 }
1363
1364 static int acpi_video_bus_add_fs(struct acpi_device *device)
1365 {
1366 long device_id;
1367 int status;
1368 struct proc_dir_entry *entry = NULL;
1369 struct acpi_video_bus *video;
1370 struct device *dev;
1371
1372 status =
1373 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1374
1375 if (!ACPI_SUCCESS(status))
1376 return -ENODEV;
1377
1378 /* We need to attempt to determine whether the _ADR refers to a
1379 PCI device or not. There's no terribly good way to do this,
1380 so the best we can hope for is to assume that there'll never
1381 be a video device in the host bridge */
1382 if (device_id >= 0x10000) {
1383 /* It looks like a PCI device. Does it exist? */
1384 dev = acpi_get_physical_device(device->handle);
1385 } else {
1386 /* It doesn't look like a PCI device. Does its parent
1387 exist? */
1388 acpi_handle phandle;
1389 if (acpi_get_parent(device->handle, &phandle))
1390 return -ENODEV;
1391 dev = acpi_get_physical_device(phandle);
1392 }
1393 if (!dev)
1394 return -ENODEV;
1395 put_device(dev);
1396
1397
1398
1399 video = acpi_driver_data(device);
1400
1401 if (!acpi_device_dir(device)) {
1402 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1403 acpi_video_dir);
1404 if (!acpi_device_dir(device))
1405 return -ENODEV;
1406 video->dir = acpi_device_dir(device);
1407 acpi_device_dir(device)->owner = THIS_MODULE;
1408 }
1409
1410 /* 'info' [R] */
1411 entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
1412 if (!entry)
1413 return -ENODEV;
1414 else {
1415 entry->proc_fops = &acpi_video_bus_info_fops;
1416 entry->data = acpi_driver_data(device);
1417 entry->owner = THIS_MODULE;
1418 }
1419
1420 /* 'ROM' [R] */
1421 entry = create_proc_entry("ROM", S_IRUGO, acpi_device_dir(device));
1422 if (!entry)
1423 return -ENODEV;
1424 else {
1425 entry->proc_fops = &acpi_video_bus_ROM_fops;
1426 entry->data = acpi_driver_data(device);
1427 entry->owner = THIS_MODULE;
1428 }
1429
1430 /* 'POST_info' [R] */
1431 entry =
1432 create_proc_entry("POST_info", S_IRUGO, acpi_device_dir(device));
1433 if (!entry)
1434 return -ENODEV;
1435 else {
1436 entry->proc_fops = &acpi_video_bus_POST_info_fops;
1437 entry->data = acpi_driver_data(device);
1438 entry->owner = THIS_MODULE;
1439 }
1440
1441 /* 'POST' [R/W] */
1442 entry =
1443 create_proc_entry("POST", S_IFREG | S_IRUGO | S_IRUSR,
1444 acpi_device_dir(device));
1445 if (!entry)
1446 return -ENODEV;
1447 else {
1448 acpi_video_bus_POST_fops.write = acpi_video_bus_write_POST;
1449 entry->proc_fops = &acpi_video_bus_POST_fops;
1450 entry->data = acpi_driver_data(device);
1451 entry->owner = THIS_MODULE;
1452 }
1453
1454 /* 'DOS' [R/W] */
1455 entry =
1456 create_proc_entry("DOS", S_IFREG | S_IRUGO | S_IRUSR,
1457 acpi_device_dir(device));
1458 if (!entry)
1459 return -ENODEV;
1460 else {
1461 acpi_video_bus_DOS_fops.write = acpi_video_bus_write_DOS;
1462 entry->proc_fops = &acpi_video_bus_DOS_fops;
1463 entry->data = acpi_driver_data(device);
1464 entry->owner = THIS_MODULE;
1465 }
1466
1467 return 0;
1468 }
1469
1470 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1471 {
1472 struct acpi_video_bus *video;
1473
1474
1475 video = acpi_driver_data(device);
1476
1477 if (acpi_device_dir(device)) {
1478 remove_proc_entry("info", acpi_device_dir(device));
1479 remove_proc_entry("ROM", acpi_device_dir(device));
1480 remove_proc_entry("POST_info", acpi_device_dir(device));
1481 remove_proc_entry("POST", acpi_device_dir(device));
1482 remove_proc_entry("DOS", acpi_device_dir(device));
1483 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1484 acpi_device_dir(device) = NULL;
1485 }
1486
1487 return 0;
1488 }
1489
1490 /* --------------------------------------------------------------------------
1491 Driver Interface
1492 -------------------------------------------------------------------------- */
1493
1494 /* device interface */
1495 static struct acpi_video_device_attrib*
1496 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1497 {
1498 int count;
1499
1500 for(count = 0; count < video->attached_count; count++)
1501 if((video->attached_array[count].value.int_val & 0xffff) == device_id)
1502 return &(video->attached_array[count].value.attrib);
1503 return NULL;
1504 }
1505
1506 static int
1507 acpi_video_bus_get_one_device(struct acpi_device *device,
1508 struct acpi_video_bus *video)
1509 {
1510 unsigned long device_id;
1511 int status;
1512 struct acpi_video_device *data;
1513 struct acpi_video_device_attrib* attribute;
1514
1515 if (!device || !video)
1516 return -EINVAL;
1517
1518 status =
1519 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1520 if (ACPI_SUCCESS(status)) {
1521
1522 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1523 if (!data)
1524 return -ENOMEM;
1525
1526 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1527 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1528 acpi_driver_data(device) = data;
1529
1530 data->device_id = device_id;
1531 data->video = video;
1532 data->dev = device;
1533
1534 attribute = acpi_video_get_device_attr(video, device_id);
1535
1536 if((attribute != NULL) && attribute->device_id_scheme) {
1537 switch (attribute->display_type) {
1538 case ACPI_VIDEO_DISPLAY_CRT:
1539 data->flags.crt = 1;
1540 break;
1541 case ACPI_VIDEO_DISPLAY_TV:
1542 data->flags.tvout = 1;
1543 break;
1544 case ACPI_VIDEO_DISPLAY_DVI:
1545 data->flags.dvi = 1;
1546 break;
1547 case ACPI_VIDEO_DISPLAY_LCD:
1548 data->flags.lcd = 1;
1549 break;
1550 default:
1551 data->flags.unknown = 1;
1552 break;
1553 }
1554 if(attribute->bios_can_detect)
1555 data->flags.bios = 1;
1556 } else
1557 data->flags.unknown = 1;
1558
1559 acpi_video_device_bind(video, data);
1560 acpi_video_device_find_cap(data);
1561
1562 status = acpi_install_notify_handler(device->handle,
1563 ACPI_DEVICE_NOTIFY,
1564 acpi_video_device_notify,
1565 data);
1566 if (ACPI_FAILURE(status)) {
1567 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1568 "Error installing notify handler\n"));
1569 if(data->brightness)
1570 kfree(data->brightness->levels);
1571 kfree(data->brightness);
1572 kfree(data);
1573 return -ENODEV;
1574 }
1575
1576 mutex_lock(&video->device_list_lock);
1577 list_add_tail(&data->entry, &video->video_device_list);
1578 mutex_unlock(&video->device_list_lock);
1579
1580 acpi_video_device_add_fs(device);
1581
1582 return 0;
1583 }
1584
1585 return -ENOENT;
1586 }
1587
1588 /*
1589 * Arg:
1590 * video : video bus device
1591 *
1592 * Return:
1593 * none
1594 *
1595 * Enumerate the video device list of the video bus,
1596 * bind the ids with the corresponding video devices
1597 * under the video bus.
1598 */
1599
1600 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1601 {
1602 struct acpi_video_device *dev;
1603
1604 mutex_lock(&video->device_list_lock);
1605
1606 list_for_each_entry(dev, &video->video_device_list, entry)
1607 acpi_video_device_bind(video, dev);
1608
1609 mutex_unlock(&video->device_list_lock);
1610 }
1611
1612 /*
1613 * Arg:
1614 * video : video bus device
1615 * device : video output device under the video
1616 * bus
1617 *
1618 * Return:
1619 * none
1620 *
1621 * Bind the ids with the corresponding video devices
1622 * under the video bus.
1623 */
1624
1625 static void
1626 acpi_video_device_bind(struct acpi_video_bus *video,
1627 struct acpi_video_device *device)
1628 {
1629 int i;
1630
1631 #define IDS_VAL(i) video->attached_array[i].value.int_val
1632 #define IDS_BIND(i) video->attached_array[i].bind_info
1633
1634 for (i = 0; IDS_VAL(i) != ACPI_VIDEO_HEAD_INVALID &&
1635 i < video->attached_count; i++) {
1636 if (device->device_id == (IDS_VAL(i) & 0xffff)) {
1637 IDS_BIND(i) = device;
1638 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1639 }
1640 }
1641 #undef IDS_VAL
1642 #undef IDS_BIND
1643 }
1644
1645 /*
1646 * Arg:
1647 * video : video bus device
1648 *
1649 * Return:
1650 * < 0 : error
1651 *
1652 * Call _DOD to enumerate all devices attached to display adapter
1653 *
1654 */
1655
1656 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1657 {
1658 int status;
1659 int count;
1660 int i;
1661 struct acpi_video_enumerated_device *active_device_list;
1662 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1663 union acpi_object *dod = NULL;
1664 union acpi_object *obj;
1665
1666 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1667 if (!ACPI_SUCCESS(status)) {
1668 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1669 return status;
1670 }
1671
1672 dod = buffer.pointer;
1673 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1674 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1675 status = -EFAULT;
1676 goto out;
1677 }
1678
1679 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1680 dod->package.count));
1681
1682 active_device_list = kmalloc((1 +
1683 dod->package.count) *
1684 sizeof(struct
1685 acpi_video_enumerated_device),
1686 GFP_KERNEL);
1687
1688 if (!active_device_list) {
1689 status = -ENOMEM;
1690 goto out;
1691 }
1692
1693 count = 0;
1694 for (i = 0; i < dod->package.count; i++) {
1695 obj = &dod->package.elements[i];
1696
1697 if (obj->type != ACPI_TYPE_INTEGER) {
1698 printk(KERN_ERR PREFIX "Invalid _DOD data\n");
1699 active_device_list[i].value.int_val =
1700 ACPI_VIDEO_HEAD_INVALID;
1701 }
1702 active_device_list[i].value.int_val = obj->integer.value;
1703 active_device_list[i].bind_info = NULL;
1704 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1705 (int)obj->integer.value));
1706 count++;
1707 }
1708 active_device_list[count].value.int_val = ACPI_VIDEO_HEAD_END;
1709
1710 kfree(video->attached_array);
1711
1712 video->attached_array = active_device_list;
1713 video->attached_count = count;
1714 out:
1715 kfree(buffer.pointer);
1716 return status;
1717 }
1718
1719 static int
1720 acpi_video_get_next_level(struct acpi_video_device *device,
1721 u32 level_current, u32 event)
1722 {
1723 int min, max, min_above, max_below, i, l, delta = 255;
1724 max = max_below = 0;
1725 min = min_above = 255;
1726 /* Find closest level to level_current */
1727 for (i = 0; i < device->brightness->count; i++) {
1728 l = device->brightness->levels[i];
1729 if (abs(l - level_current) < abs(delta)) {
1730 delta = l - level_current;
1731 if (!delta)
1732 break;
1733 }
1734 }
1735 /* Ajust level_current to closest available level */
1736 level_current += delta;
1737 for (i = 0; i < device->brightness->count; i++) {
1738 l = device->brightness->levels[i];
1739 if (l < min)
1740 min = l;
1741 if (l > max)
1742 max = l;
1743 if (l < min_above && l > level_current)
1744 min_above = l;
1745 if (l > max_below && l < level_current)
1746 max_below = l;
1747 }
1748
1749 switch (event) {
1750 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1751 return (level_current < max) ? min_above : min;
1752 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1753 return (level_current < max) ? min_above : max;
1754 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1755 return (level_current > min) ? max_below : min;
1756 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1757 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1758 return 0;
1759 default:
1760 return level_current;
1761 }
1762 }
1763
1764 static void
1765 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1766 {
1767 unsigned long level_current, level_next;
1768 acpi_video_device_lcd_get_level_current(device, &level_current);
1769 level_next = acpi_video_get_next_level(device, level_current, event);
1770 acpi_video_device_lcd_set_level(device, level_next);
1771 }
1772
1773 static int
1774 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1775 struct acpi_device *device)
1776 {
1777 int status = 0;
1778 struct acpi_device *dev;
1779
1780 acpi_video_device_enumerate(video);
1781
1782 list_for_each_entry(dev, &device->children, node) {
1783
1784 status = acpi_video_bus_get_one_device(dev, video);
1785 if (ACPI_FAILURE(status)) {
1786 ACPI_EXCEPTION((AE_INFO, status, "Cant attach device"));
1787 continue;
1788 }
1789 }
1790 return status;
1791 }
1792
1793 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1794 {
1795 acpi_status status;
1796 struct acpi_video_bus *video;
1797
1798
1799 if (!device || !device->video)
1800 return -ENOENT;
1801
1802 video = device->video;
1803
1804 acpi_video_device_remove_fs(device->dev);
1805
1806 status = acpi_remove_notify_handler(device->dev->handle,
1807 ACPI_DEVICE_NOTIFY,
1808 acpi_video_device_notify);
1809 backlight_device_unregister(device->backlight);
1810 if (device->cdev) {
1811 sysfs_remove_link(&device->dev->dev.kobj,
1812 "thermal_cooling");
1813 sysfs_remove_link(&device->cdev->device.kobj,
1814 "device");
1815 thermal_cooling_device_unregister(device->cdev);
1816 device->cdev = NULL;
1817 }
1818 video_output_unregister(device->output_dev);
1819
1820 return 0;
1821 }
1822
1823 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1824 {
1825 int status;
1826 struct acpi_video_device *dev, *next;
1827
1828 mutex_lock(&video->device_list_lock);
1829
1830 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1831
1832 status = acpi_video_bus_put_one_device(dev);
1833 if (ACPI_FAILURE(status))
1834 printk(KERN_WARNING PREFIX
1835 "hhuuhhuu bug in acpi video driver.\n");
1836
1837 if (dev->brightness) {
1838 kfree(dev->brightness->levels);
1839 kfree(dev->brightness);
1840 }
1841 list_del(&dev->entry);
1842 kfree(dev);
1843 }
1844
1845 mutex_unlock(&video->device_list_lock);
1846
1847 return 0;
1848 }
1849
1850 /* acpi_video interface */
1851
1852 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1853 {
1854 return acpi_video_bus_DOS(video, 0, 0);
1855 }
1856
1857 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1858 {
1859 return acpi_video_bus_DOS(video, 0, 1);
1860 }
1861
1862 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
1863 {
1864 struct acpi_video_bus *video = data;
1865 struct acpi_device *device = NULL;
1866 struct input_dev *input;
1867 int keycode;
1868
1869 if (!video)
1870 return;
1871
1872 device = video->device;
1873 input = video->input;
1874
1875 switch (event) {
1876 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1877 * most likely via hotkey. */
1878 acpi_bus_generate_proc_event(device, event, 0);
1879 keycode = KEY_SWITCHVIDEOMODE;
1880 break;
1881
1882 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1883 * connector. */
1884 acpi_video_device_enumerate(video);
1885 acpi_video_device_rebind(video);
1886 acpi_bus_generate_proc_event(device, event, 0);
1887 keycode = KEY_SWITCHVIDEOMODE;
1888 break;
1889
1890 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1891 acpi_bus_generate_proc_event(device, event, 0);
1892 keycode = KEY_SWITCHVIDEOMODE;
1893 break;
1894 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1895 acpi_bus_generate_proc_event(device, event, 0);
1896 keycode = KEY_VIDEO_NEXT;
1897 break;
1898 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1899 acpi_bus_generate_proc_event(device, event, 0);
1900 keycode = KEY_VIDEO_PREV;
1901 break;
1902
1903 default:
1904 keycode = KEY_UNKNOWN;
1905 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1906 "Unsupported event [0x%x]\n", event));
1907 break;
1908 }
1909
1910 acpi_notifier_call_chain(device, event, 0);
1911 input_report_key(input, keycode, 1);
1912 input_sync(input);
1913 input_report_key(input, keycode, 0);
1914 input_sync(input);
1915
1916 return;
1917 }
1918
1919 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1920 {
1921 struct acpi_video_device *video_device = data;
1922 struct acpi_device *device = NULL;
1923 struct acpi_video_bus *bus;
1924 struct input_dev *input;
1925 int keycode;
1926
1927 if (!video_device)
1928 return;
1929
1930 device = video_device->dev;
1931 bus = video_device->video;
1932 input = bus->input;
1933
1934 switch (event) {
1935 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1936 if (brightness_switch_enabled)
1937 acpi_video_switch_brightness(video_device, event);
1938 acpi_bus_generate_proc_event(device, event, 0);
1939 keycode = KEY_BRIGHTNESS_CYCLE;
1940 break;
1941 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1942 if (brightness_switch_enabled)
1943 acpi_video_switch_brightness(video_device, event);
1944 acpi_bus_generate_proc_event(device, event, 0);
1945 keycode = KEY_BRIGHTNESSUP;
1946 break;
1947 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1948 if (brightness_switch_enabled)
1949 acpi_video_switch_brightness(video_device, event);
1950 acpi_bus_generate_proc_event(device, event, 0);
1951 keycode = KEY_BRIGHTNESSDOWN;
1952 break;
1953 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
1954 if (brightness_switch_enabled)
1955 acpi_video_switch_brightness(video_device, event);
1956 acpi_bus_generate_proc_event(device, event, 0);
1957 keycode = KEY_BRIGHTNESS_ZERO;
1958 break;
1959 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1960 if (brightness_switch_enabled)
1961 acpi_video_switch_brightness(video_device, event);
1962 acpi_bus_generate_proc_event(device, event, 0);
1963 keycode = KEY_DISPLAY_OFF;
1964 break;
1965 default:
1966 keycode = KEY_UNKNOWN;
1967 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1968 "Unsupported event [0x%x]\n", event));
1969 break;
1970 }
1971
1972 acpi_notifier_call_chain(device, event, 0);
1973 input_report_key(input, keycode, 1);
1974 input_sync(input);
1975 input_report_key(input, keycode, 0);
1976 input_sync(input);
1977
1978 return;
1979 }
1980
1981 static int instance;
1982 static int acpi_video_resume(struct acpi_device *device)
1983 {
1984 struct acpi_video_bus *video;
1985 struct acpi_video_device *video_device;
1986 int i;
1987
1988 if (!device || !acpi_driver_data(device))
1989 return -EINVAL;
1990
1991 video = acpi_driver_data(device);
1992
1993 for (i = 0; i < video->attached_count; i++) {
1994 video_device = video->attached_array[i].bind_info;
1995 if (video_device && video_device->backlight)
1996 acpi_video_set_brightness(video_device->backlight);
1997 }
1998 return AE_OK;
1999 }
2000
2001 static int acpi_video_bus_add(struct acpi_device *device)
2002 {
2003 acpi_status status;
2004 struct acpi_video_bus *video;
2005 struct input_dev *input;
2006 int error;
2007
2008 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2009 if (!video)
2010 return -ENOMEM;
2011
2012 /* a hack to fix the duplicate name "VID" problem on T61 */
2013 if (!strcmp(device->pnp.bus_id, "VID")) {
2014 if (instance)
2015 device->pnp.bus_id[3] = '0' + instance;
2016 instance ++;
2017 }
2018
2019 video->device = device;
2020 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2021 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2022 acpi_driver_data(device) = video;
2023
2024 acpi_video_bus_find_cap(video);
2025 error = acpi_video_bus_check(video);
2026 if (error)
2027 goto err_free_video;
2028
2029 error = acpi_video_bus_add_fs(device);
2030 if (error)
2031 goto err_free_video;
2032
2033 mutex_init(&video->device_list_lock);
2034 INIT_LIST_HEAD(&video->video_device_list);
2035
2036 acpi_video_bus_get_devices(video, device);
2037 acpi_video_bus_start_devices(video);
2038
2039 status = acpi_install_notify_handler(device->handle,
2040 ACPI_DEVICE_NOTIFY,
2041 acpi_video_bus_notify, video);
2042 if (ACPI_FAILURE(status)) {
2043 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
2044 "Error installing notify handler\n"));
2045 error = -ENODEV;
2046 goto err_stop_video;
2047 }
2048
2049 video->input = input = input_allocate_device();
2050 if (!input) {
2051 error = -ENOMEM;
2052 goto err_uninstall_notify;
2053 }
2054
2055 snprintf(video->phys, sizeof(video->phys),
2056 "%s/video/input0", acpi_device_hid(video->device));
2057
2058 input->name = acpi_device_name(video->device);
2059 input->phys = video->phys;
2060 input->id.bustype = BUS_HOST;
2061 input->id.product = 0x06;
2062 input->dev.parent = &device->dev;
2063 input->evbit[0] = BIT(EV_KEY);
2064 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2065 set_bit(KEY_VIDEO_NEXT, input->keybit);
2066 set_bit(KEY_VIDEO_PREV, input->keybit);
2067 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2068 set_bit(KEY_BRIGHTNESSUP, input->keybit);
2069 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2070 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2071 set_bit(KEY_DISPLAY_OFF, input->keybit);
2072 set_bit(KEY_UNKNOWN, input->keybit);
2073
2074 error = input_register_device(input);
2075 if (error)
2076 goto err_free_input_dev;
2077
2078 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
2079 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2080 video->flags.multihead ? "yes" : "no",
2081 video->flags.rom ? "yes" : "no",
2082 video->flags.post ? "yes" : "no");
2083
2084 return 0;
2085
2086 err_free_input_dev:
2087 input_free_device(input);
2088 err_uninstall_notify:
2089 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
2090 acpi_video_bus_notify);
2091 err_stop_video:
2092 acpi_video_bus_stop_devices(video);
2093 acpi_video_bus_put_devices(video);
2094 kfree(video->attached_array);
2095 acpi_video_bus_remove_fs(device);
2096 err_free_video:
2097 kfree(video);
2098 acpi_driver_data(device) = NULL;
2099
2100 return error;
2101 }
2102
2103 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2104 {
2105 acpi_status status = 0;
2106 struct acpi_video_bus *video = NULL;
2107
2108
2109 if (!device || !acpi_driver_data(device))
2110 return -EINVAL;
2111
2112 video = acpi_driver_data(device);
2113
2114 acpi_video_bus_stop_devices(video);
2115
2116 status = acpi_remove_notify_handler(video->device->handle,
2117 ACPI_DEVICE_NOTIFY,
2118 acpi_video_bus_notify);
2119
2120 acpi_video_bus_put_devices(video);
2121 acpi_video_bus_remove_fs(device);
2122
2123 input_unregister_device(video->input);
2124 kfree(video->attached_array);
2125 kfree(video);
2126
2127 return 0;
2128 }
2129
2130 static int __init acpi_video_init(void)
2131 {
2132 int result = 0;
2133
2134
2135 /*
2136 acpi_dbg_level = 0xFFFFFFFF;
2137 acpi_dbg_layer = 0x08000000;
2138 */
2139
2140 acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2141 if (!acpi_video_dir)
2142 return -ENODEV;
2143 acpi_video_dir->owner = THIS_MODULE;
2144
2145 result = acpi_bus_register_driver(&acpi_video_bus);
2146 if (result < 0) {
2147 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2148 return -ENODEV;
2149 }
2150
2151 return 0;
2152 }
2153
2154 static void __exit acpi_video_exit(void)
2155 {
2156
2157 acpi_bus_unregister_driver(&acpi_video_bus);
2158
2159 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2160
2161 return;
2162 }
2163
2164 module_init(acpi_video_init);
2165 module_exit(acpi_video_exit);
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