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Linux 3.16-rc5
[deliverable/linux.git] / drivers / acpi / video.c
1 /*
2 * video.c - ACPI Video Driver
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/input.h>
34 #include <linux/backlight.h>
35 #include <linux/thermal.h>
36 #include <linux/sort.h>
37 #include <linux/pci.h>
38 #include <linux/pci_ids.h>
39 #include <linux/slab.h>
40 #include <linux/dmi.h>
41 #include <linux/suspend.h>
42 #include <linux/acpi.h>
43 #include <acpi/video.h>
44 #include <asm/uaccess.h>
45
46 #include "internal.h"
47
48 #define ACPI_VIDEO_BUS_NAME "Video Bus"
49 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
50 #define ACPI_VIDEO_NOTIFY_SWITCH 0x80
51 #define ACPI_VIDEO_NOTIFY_PROBE 0x81
52 #define ACPI_VIDEO_NOTIFY_CYCLE 0x82
53 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
54 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
55
56 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
57 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
58 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
59 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
60 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
61
62 #define MAX_NAME_LEN 20
63
64 #define _COMPONENT ACPI_VIDEO_COMPONENT
65 ACPI_MODULE_NAME("video");
66
67 MODULE_AUTHOR("Bruno Ducrot");
68 MODULE_DESCRIPTION("ACPI Video Driver");
69 MODULE_LICENSE("GPL");
70
71 static bool brightness_switch_enabled;
72 module_param(brightness_switch_enabled, bool, 0644);
73
74 /*
75 * By default, we don't allow duplicate ACPI video bus devices
76 * under the same VGA controller
77 */
78 static bool allow_duplicates;
79 module_param(allow_duplicates, bool, 0644);
80
81 /*
82 * For Windows 8 systems: used to decide if video module
83 * should skip registering backlight interface of its own.
84 */
85 static int use_native_backlight_param = 1;
86 module_param_named(use_native_backlight, use_native_backlight_param, int, 0444);
87 static bool use_native_backlight_dmi = false;
88
89 static int register_count;
90 static struct mutex video_list_lock;
91 static struct list_head video_bus_head;
92 static int acpi_video_bus_add(struct acpi_device *device);
93 static int acpi_video_bus_remove(struct acpi_device *device);
94 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
95
96 static const struct acpi_device_id video_device_ids[] = {
97 {ACPI_VIDEO_HID, 0},
98 {"", 0},
99 };
100 MODULE_DEVICE_TABLE(acpi, video_device_ids);
101
102 static struct acpi_driver acpi_video_bus = {
103 .name = "video",
104 .class = ACPI_VIDEO_CLASS,
105 .ids = video_device_ids,
106 .ops = {
107 .add = acpi_video_bus_add,
108 .remove = acpi_video_bus_remove,
109 .notify = acpi_video_bus_notify,
110 },
111 };
112
113 struct acpi_video_bus_flags {
114 u8 multihead:1; /* can switch video heads */
115 u8 rom:1; /* can retrieve a video rom */
116 u8 post:1; /* can configure the head to */
117 u8 reserved:5;
118 };
119
120 struct acpi_video_bus_cap {
121 u8 _DOS:1; /* Enable/Disable output switching */
122 u8 _DOD:1; /* Enumerate all devices attached to display adapter */
123 u8 _ROM:1; /* Get ROM Data */
124 u8 _GPD:1; /* Get POST Device */
125 u8 _SPD:1; /* Set POST Device */
126 u8 _VPO:1; /* Video POST Options */
127 u8 reserved:2;
128 };
129
130 struct acpi_video_device_attrib {
131 u32 display_index:4; /* A zero-based instance of the Display */
132 u32 display_port_attachment:4; /* This field differentiates the display type */
133 u32 display_type:4; /* Describe the specific type in use */
134 u32 vendor_specific:4; /* Chipset Vendor Specific */
135 u32 bios_can_detect:1; /* BIOS can detect the device */
136 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to
137 the VGA device. */
138 u32 pipe_id:3; /* For VGA multiple-head devices. */
139 u32 reserved:10; /* Must be 0 */
140 u32 device_id_scheme:1; /* Device ID Scheme */
141 };
142
143 struct acpi_video_enumerated_device {
144 union {
145 u32 int_val;
146 struct acpi_video_device_attrib attrib;
147 } value;
148 struct acpi_video_device *bind_info;
149 };
150
151 struct acpi_video_bus {
152 struct acpi_device *device;
153 bool backlight_registered;
154 bool backlight_notifier_registered;
155 u8 dos_setting;
156 struct acpi_video_enumerated_device *attached_array;
157 u8 attached_count;
158 struct acpi_video_bus_cap cap;
159 struct acpi_video_bus_flags flags;
160 struct list_head video_device_list;
161 struct mutex device_list_lock; /* protects video_device_list */
162 struct list_head entry;
163 struct input_dev *input;
164 char phys[32]; /* for input device */
165 struct notifier_block pm_nb;
166 struct notifier_block backlight_nb;
167 };
168
169 struct acpi_video_device_flags {
170 u8 crt:1;
171 u8 lcd:1;
172 u8 tvout:1;
173 u8 dvi:1;
174 u8 bios:1;
175 u8 unknown:1;
176 u8 notify:1;
177 u8 reserved:1;
178 };
179
180 struct acpi_video_device_cap {
181 u8 _ADR:1; /* Return the unique ID */
182 u8 _BCL:1; /* Query list of brightness control levels supported */
183 u8 _BCM:1; /* Set the brightness level */
184 u8 _BQC:1; /* Get current brightness level */
185 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
186 u8 _DDC:1; /* Return the EDID for this device */
187 };
188
189 struct acpi_video_brightness_flags {
190 u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
191 u8 _BCL_reversed:1; /* _BCL package is in a reversed order */
192 u8 _BQC_use_index:1; /* _BQC returns an index value */
193 };
194
195 struct acpi_video_device_brightness {
196 int curr;
197 int count;
198 int *levels;
199 struct acpi_video_brightness_flags flags;
200 };
201
202 struct acpi_video_device {
203 unsigned long device_id;
204 struct acpi_video_device_flags flags;
205 struct acpi_video_device_cap cap;
206 struct list_head entry;
207 struct acpi_video_bus *video;
208 struct acpi_device *dev;
209 struct acpi_video_device_brightness *brightness;
210 struct backlight_device *backlight;
211 struct thermal_cooling_device *cooling_dev;
212 };
213
214 static const char device_decode[][30] = {
215 "motherboard VGA device",
216 "PCI VGA device",
217 "AGP VGA device",
218 "UNKNOWN",
219 };
220
221 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
222 static void acpi_video_device_rebind(struct acpi_video_bus *video);
223 static void acpi_video_device_bind(struct acpi_video_bus *video,
224 struct acpi_video_device *device);
225 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
226 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
227 int level);
228 static int acpi_video_device_lcd_get_level_current(
229 struct acpi_video_device *device,
230 unsigned long long *level, bool raw);
231 static int acpi_video_get_next_level(struct acpi_video_device *device,
232 u32 level_current, u32 event);
233 static int acpi_video_switch_brightness(struct acpi_video_device *device,
234 int event);
235
236 static bool acpi_video_use_native_backlight(void)
237 {
238 if (use_native_backlight_param != -1)
239 return use_native_backlight_param;
240 else
241 return use_native_backlight_dmi;
242 }
243
244 bool acpi_video_verify_backlight_support(void)
245 {
246 if (acpi_osi_is_win8() && acpi_video_use_native_backlight() &&
247 backlight_device_registered(BACKLIGHT_RAW))
248 return false;
249 return acpi_video_backlight_support();
250 }
251 EXPORT_SYMBOL_GPL(acpi_video_verify_backlight_support);
252
253 /* backlight device sysfs support */
254 static int acpi_video_get_brightness(struct backlight_device *bd)
255 {
256 unsigned long long cur_level;
257 int i;
258 struct acpi_video_device *vd = bl_get_data(bd);
259
260 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
261 return -EINVAL;
262 for (i = 2; i < vd->brightness->count; i++) {
263 if (vd->brightness->levels[i] == cur_level)
264 /*
265 * The first two entries are special - see page 575
266 * of the ACPI spec 3.0
267 */
268 return i - 2;
269 }
270 return 0;
271 }
272
273 static int acpi_video_set_brightness(struct backlight_device *bd)
274 {
275 int request_level = bd->props.brightness + 2;
276 struct acpi_video_device *vd = bl_get_data(bd);
277
278 return acpi_video_device_lcd_set_level(vd,
279 vd->brightness->levels[request_level]);
280 }
281
282 static const struct backlight_ops acpi_backlight_ops = {
283 .get_brightness = acpi_video_get_brightness,
284 .update_status = acpi_video_set_brightness,
285 };
286
287 /* thermal cooling device callbacks */
288 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
289 long *state)
290 {
291 struct acpi_device *device = cooling_dev->devdata;
292 struct acpi_video_device *video = acpi_driver_data(device);
293
294 *state = video->brightness->count - 3;
295 return 0;
296 }
297
298 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
299 long *state)
300 {
301 struct acpi_device *device = cooling_dev->devdata;
302 struct acpi_video_device *video = acpi_driver_data(device);
303 unsigned long long level;
304 int offset;
305
306 if (acpi_video_device_lcd_get_level_current(video, &level, false))
307 return -EINVAL;
308 for (offset = 2; offset < video->brightness->count; offset++)
309 if (level == video->brightness->levels[offset]) {
310 *state = video->brightness->count - offset - 1;
311 return 0;
312 }
313
314 return -EINVAL;
315 }
316
317 static int
318 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
319 {
320 struct acpi_device *device = cooling_dev->devdata;
321 struct acpi_video_device *video = acpi_driver_data(device);
322 int level;
323
324 if (state >= video->brightness->count - 2)
325 return -EINVAL;
326
327 state = video->brightness->count - state;
328 level = video->brightness->levels[state - 1];
329 return acpi_video_device_lcd_set_level(video, level);
330 }
331
332 static const struct thermal_cooling_device_ops video_cooling_ops = {
333 .get_max_state = video_get_max_state,
334 .get_cur_state = video_get_cur_state,
335 .set_cur_state = video_set_cur_state,
336 };
337
338 /*
339 * --------------------------------------------------------------------------
340 * Video Management
341 * --------------------------------------------------------------------------
342 */
343
344 static int
345 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
346 union acpi_object **levels)
347 {
348 int status;
349 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
350 union acpi_object *obj;
351
352
353 *levels = NULL;
354
355 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
356 if (!ACPI_SUCCESS(status))
357 return status;
358 obj = (union acpi_object *)buffer.pointer;
359 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
360 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
361 status = -EFAULT;
362 goto err;
363 }
364
365 *levels = obj;
366
367 return 0;
368
369 err:
370 kfree(buffer.pointer);
371
372 return status;
373 }
374
375 static int
376 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
377 {
378 int status;
379 int state;
380
381 status = acpi_execute_simple_method(device->dev->handle,
382 "_BCM", level);
383 if (ACPI_FAILURE(status)) {
384 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
385 return -EIO;
386 }
387
388 device->brightness->curr = level;
389 for (state = 2; state < device->brightness->count; state++)
390 if (level == device->brightness->levels[state]) {
391 if (device->backlight)
392 device->backlight->props.brightness = state - 2;
393 return 0;
394 }
395
396 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
397 return -EINVAL;
398 }
399
400 /*
401 * For some buggy _BQC methods, we need to add a constant value to
402 * the _BQC return value to get the actual current brightness level
403 */
404
405 static int bqc_offset_aml_bug_workaround;
406 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
407 {
408 bqc_offset_aml_bug_workaround = 9;
409 return 0;
410 }
411
412 static int __init video_set_use_native_backlight(const struct dmi_system_id *d)
413 {
414 use_native_backlight_dmi = true;
415 return 0;
416 }
417
418 static struct dmi_system_id video_dmi_table[] __initdata = {
419 /*
420 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
421 */
422 {
423 .callback = video_set_bqc_offset,
424 .ident = "Acer Aspire 5720",
425 .matches = {
426 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
427 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
428 },
429 },
430 {
431 .callback = video_set_bqc_offset,
432 .ident = "Acer Aspire 5710Z",
433 .matches = {
434 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
435 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
436 },
437 },
438 {
439 .callback = video_set_bqc_offset,
440 .ident = "eMachines E510",
441 .matches = {
442 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
443 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
444 },
445 },
446 {
447 .callback = video_set_bqc_offset,
448 .ident = "Acer Aspire 5315",
449 .matches = {
450 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
451 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
452 },
453 },
454 {
455 .callback = video_set_bqc_offset,
456 .ident = "Acer Aspire 7720",
457 .matches = {
458 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
459 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
460 },
461 },
462 {
463 .callback = video_set_use_native_backlight,
464 .ident = "ThinkPad T430 and T430s",
465 .matches = {
466 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
467 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T430"),
468 },
469 },
470 {
471 .callback = video_set_use_native_backlight,
472 .ident = "ThinkPad X230",
473 .matches = {
474 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
475 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X230"),
476 },
477 },
478 {
479 .callback = video_set_use_native_backlight,
480 .ident = "ThinkPad W530",
481 .matches = {
482 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
483 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad W530"),
484 },
485 },
486 {
487 .callback = video_set_use_native_backlight,
488 .ident = "ThinkPad X1 Carbon",
489 .matches = {
490 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
491 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X1 Carbon"),
492 },
493 },
494 {
495 .callback = video_set_use_native_backlight,
496 .ident = "Lenovo Yoga 13",
497 .matches = {
498 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
499 DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo IdeaPad Yoga 13"),
500 },
501 },
502 {
503 .callback = video_set_use_native_backlight,
504 .ident = "Lenovo Yoga 2 11",
505 .matches = {
506 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
507 DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo Yoga 2 11"),
508 },
509 },
510 {
511 .callback = video_set_use_native_backlight,
512 .ident = "Thinkpad Helix",
513 .matches = {
514 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
515 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad Helix"),
516 },
517 },
518 {
519 .callback = video_set_use_native_backlight,
520 .ident = "Dell Inspiron 7520",
521 .matches = {
522 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
523 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7520"),
524 },
525 },
526 {
527 .callback = video_set_use_native_backlight,
528 .ident = "Acer Aspire 5733Z",
529 .matches = {
530 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
531 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5733Z"),
532 },
533 },
534 {
535 .callback = video_set_use_native_backlight,
536 .ident = "Acer Aspire 5742G",
537 .matches = {
538 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
539 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5742G"),
540 },
541 },
542 {
543 .callback = video_set_use_native_backlight,
544 .ident = "Acer Aspire V5-171",
545 .matches = {
546 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
547 DMI_MATCH(DMI_PRODUCT_NAME, "V5-171"),
548 },
549 },
550 {
551 .callback = video_set_use_native_backlight,
552 .ident = "Acer Aspire V5-431",
553 .matches = {
554 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
555 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-431"),
556 },
557 },
558 {
559 .callback = video_set_use_native_backlight,
560 .ident = "Acer Aspire V5-471G",
561 .matches = {
562 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
563 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-471G"),
564 },
565 },
566 {
567 .callback = video_set_use_native_backlight,
568 .ident = "Acer TravelMate B113",
569 .matches = {
570 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
571 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate B113"),
572 },
573 },
574 {
575 .callback = video_set_use_native_backlight,
576 .ident = "HP ProBook 4340s",
577 .matches = {
578 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
579 DMI_MATCH(DMI_PRODUCT_VERSION, "HP ProBook 4340s"),
580 },
581 },
582 {
583 .callback = video_set_use_native_backlight,
584 .ident = "HP ProBook 2013 models",
585 .matches = {
586 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
587 DMI_MATCH(DMI_PRODUCT_NAME, "HP ProBook "),
588 DMI_MATCH(DMI_PRODUCT_NAME, " G1"),
589 },
590 },
591 {
592 .callback = video_set_use_native_backlight,
593 .ident = "HP EliteBook 2013 models",
594 .matches = {
595 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
596 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook "),
597 DMI_MATCH(DMI_PRODUCT_NAME, " G1"),
598 },
599 },
600 {
601 .callback = video_set_use_native_backlight,
602 .ident = "HP ZBook 14",
603 .matches = {
604 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
605 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 14"),
606 },
607 },
608 {
609 .callback = video_set_use_native_backlight,
610 .ident = "HP ZBook 15",
611 .matches = {
612 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
613 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 15"),
614 },
615 },
616 {
617 .callback = video_set_use_native_backlight,
618 .ident = "HP ZBook 17",
619 .matches = {
620 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
621 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 17"),
622 },
623 },
624 {
625 .callback = video_set_use_native_backlight,
626 .ident = "HP EliteBook 8470p",
627 .matches = {
628 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
629 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8470p"),
630 },
631 },
632 {
633 .callback = video_set_use_native_backlight,
634 .ident = "HP EliteBook 8780w",
635 .matches = {
636 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
637 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8780w"),
638 },
639 },
640 {}
641 };
642
643 static unsigned long long
644 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
645 unsigned long long bqc_value)
646 {
647 unsigned long long level;
648
649 if (device->brightness->flags._BQC_use_index) {
650 /*
651 * _BQC returns an index that doesn't account for
652 * the first 2 items with special meaning, so we need
653 * to compensate for that by offsetting ourselves
654 */
655 if (device->brightness->flags._BCL_reversed)
656 bqc_value = device->brightness->count - 3 - bqc_value;
657
658 level = device->brightness->levels[bqc_value + 2];
659 } else {
660 level = bqc_value;
661 }
662
663 level += bqc_offset_aml_bug_workaround;
664
665 return level;
666 }
667
668 static int
669 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
670 unsigned long long *level, bool raw)
671 {
672 acpi_status status = AE_OK;
673 int i;
674
675 if (device->cap._BQC || device->cap._BCQ) {
676 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
677
678 status = acpi_evaluate_integer(device->dev->handle, buf,
679 NULL, level);
680 if (ACPI_SUCCESS(status)) {
681 if (raw) {
682 /*
683 * Caller has indicated he wants the raw
684 * value returned by _BQC, so don't furtherly
685 * mess with the value.
686 */
687 return 0;
688 }
689
690 *level = acpi_video_bqc_value_to_level(device, *level);
691
692 for (i = 2; i < device->brightness->count; i++)
693 if (device->brightness->levels[i] == *level) {
694 device->brightness->curr = *level;
695 return 0;
696 }
697 /*
698 * BQC returned an invalid level.
699 * Stop using it.
700 */
701 ACPI_WARNING((AE_INFO,
702 "%s returned an invalid level",
703 buf));
704 device->cap._BQC = device->cap._BCQ = 0;
705 } else {
706 /*
707 * Fixme:
708 * should we return an error or ignore this failure?
709 * dev->brightness->curr is a cached value which stores
710 * the correct current backlight level in most cases.
711 * ACPI video backlight still works w/ buggy _BQC.
712 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
713 */
714 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
715 device->cap._BQC = device->cap._BCQ = 0;
716 }
717 }
718
719 *level = device->brightness->curr;
720 return 0;
721 }
722
723 static int
724 acpi_video_device_EDID(struct acpi_video_device *device,
725 union acpi_object **edid, ssize_t length)
726 {
727 int status;
728 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
729 union acpi_object *obj;
730 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
731 struct acpi_object_list args = { 1, &arg0 };
732
733
734 *edid = NULL;
735
736 if (!device)
737 return -ENODEV;
738 if (length == 128)
739 arg0.integer.value = 1;
740 else if (length == 256)
741 arg0.integer.value = 2;
742 else
743 return -EINVAL;
744
745 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
746 if (ACPI_FAILURE(status))
747 return -ENODEV;
748
749 obj = buffer.pointer;
750
751 if (obj && obj->type == ACPI_TYPE_BUFFER)
752 *edid = obj;
753 else {
754 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
755 status = -EFAULT;
756 kfree(obj);
757 }
758
759 return status;
760 }
761
762 /* bus */
763
764 /*
765 * Arg:
766 * video : video bus device pointer
767 * bios_flag :
768 * 0. The system BIOS should NOT automatically switch(toggle)
769 * the active display output.
770 * 1. The system BIOS should automatically switch (toggle) the
771 * active display output. No switch event.
772 * 2. The _DGS value should be locked.
773 * 3. The system BIOS should not automatically switch (toggle) the
774 * active display output, but instead generate the display switch
775 * event notify code.
776 * lcd_flag :
777 * 0. The system BIOS should automatically control the brightness level
778 * of the LCD when the power changes from AC to DC
779 * 1. The system BIOS should NOT automatically control the brightness
780 * level of the LCD when the power changes from AC to DC.
781 * Return Value:
782 * -EINVAL wrong arg.
783 */
784
785 static int
786 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
787 {
788 acpi_status status;
789
790 if (!video->cap._DOS)
791 return 0;
792
793 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
794 return -EINVAL;
795 video->dos_setting = (lcd_flag << 2) | bios_flag;
796 status = acpi_execute_simple_method(video->device->handle, "_DOS",
797 (lcd_flag << 2) | bios_flag);
798 if (ACPI_FAILURE(status))
799 return -EIO;
800
801 return 0;
802 }
803
804 /*
805 * Simple comparison function used to sort backlight levels.
806 */
807
808 static int
809 acpi_video_cmp_level(const void *a, const void *b)
810 {
811 return *(int *)a - *(int *)b;
812 }
813
814 /*
815 * Decides if _BQC/_BCQ for this system is usable
816 *
817 * We do this by changing the level first and then read out the current
818 * brightness level, if the value does not match, find out if it is using
819 * index. If not, clear the _BQC/_BCQ capability.
820 */
821 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
822 int max_level, int current_level)
823 {
824 struct acpi_video_device_brightness *br = device->brightness;
825 int result;
826 unsigned long long level;
827 int test_level;
828
829 /* don't mess with existing known broken systems */
830 if (bqc_offset_aml_bug_workaround)
831 return 0;
832
833 /*
834 * Some systems always report current brightness level as maximum
835 * through _BQC, we need to test another value for them.
836 */
837 test_level = current_level == max_level ? br->levels[3] : max_level;
838
839 result = acpi_video_device_lcd_set_level(device, test_level);
840 if (result)
841 return result;
842
843 result = acpi_video_device_lcd_get_level_current(device, &level, true);
844 if (result)
845 return result;
846
847 if (level != test_level) {
848 /* buggy _BQC found, need to find out if it uses index */
849 if (level < br->count) {
850 if (br->flags._BCL_reversed)
851 level = br->count - 3 - level;
852 if (br->levels[level + 2] == test_level)
853 br->flags._BQC_use_index = 1;
854 }
855
856 if (!br->flags._BQC_use_index)
857 device->cap._BQC = device->cap._BCQ = 0;
858 }
859
860 return 0;
861 }
862
863
864 /*
865 * Arg:
866 * device : video output device (LCD, CRT, ..)
867 *
868 * Return Value:
869 * Maximum brightness level
870 *
871 * Allocate and initialize device->brightness.
872 */
873
874 static int
875 acpi_video_init_brightness(struct acpi_video_device *device)
876 {
877 union acpi_object *obj = NULL;
878 int i, max_level = 0, count = 0, level_ac_battery = 0;
879 unsigned long long level, level_old;
880 union acpi_object *o;
881 struct acpi_video_device_brightness *br = NULL;
882 int result = -EINVAL;
883 u32 value;
884
885 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
886 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
887 "LCD brightness level\n"));
888 goto out;
889 }
890
891 if (obj->package.count < 2)
892 goto out;
893
894 br = kzalloc(sizeof(*br), GFP_KERNEL);
895 if (!br) {
896 printk(KERN_ERR "can't allocate memory\n");
897 result = -ENOMEM;
898 goto out;
899 }
900
901 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
902 GFP_KERNEL);
903 if (!br->levels) {
904 result = -ENOMEM;
905 goto out_free;
906 }
907
908 for (i = 0; i < obj->package.count; i++) {
909 o = (union acpi_object *)&obj->package.elements[i];
910 if (o->type != ACPI_TYPE_INTEGER) {
911 printk(KERN_ERR PREFIX "Invalid data\n");
912 continue;
913 }
914 value = (u32) o->integer.value;
915 /* Skip duplicate entries */
916 if (count > 2 && br->levels[count - 1] == value)
917 continue;
918
919 br->levels[count] = value;
920
921 if (br->levels[count] > max_level)
922 max_level = br->levels[count];
923 count++;
924 }
925
926 /*
927 * some buggy BIOS don't export the levels
928 * when machine is on AC/Battery in _BCL package.
929 * In this case, the first two elements in _BCL packages
930 * are also supported brightness levels that OS should take care of.
931 */
932 for (i = 2; i < count; i++) {
933 if (br->levels[i] == br->levels[0])
934 level_ac_battery++;
935 if (br->levels[i] == br->levels[1])
936 level_ac_battery++;
937 }
938
939 if (level_ac_battery < 2) {
940 level_ac_battery = 2 - level_ac_battery;
941 br->flags._BCL_no_ac_battery_levels = 1;
942 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
943 br->levels[i] = br->levels[i - level_ac_battery];
944 count += level_ac_battery;
945 } else if (level_ac_battery > 2)
946 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
947
948 /* Check if the _BCL package is in a reversed order */
949 if (max_level == br->levels[2]) {
950 br->flags._BCL_reversed = 1;
951 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
952 acpi_video_cmp_level, NULL);
953 } else if (max_level != br->levels[count - 1])
954 ACPI_ERROR((AE_INFO,
955 "Found unordered _BCL package"));
956
957 br->count = count;
958 device->brightness = br;
959
960 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
961 br->curr = level = max_level;
962
963 if (!device->cap._BQC)
964 goto set_level;
965
966 result = acpi_video_device_lcd_get_level_current(device,
967 &level_old, true);
968 if (result)
969 goto out_free_levels;
970
971 result = acpi_video_bqc_quirk(device, max_level, level_old);
972 if (result)
973 goto out_free_levels;
974 /*
975 * cap._BQC may get cleared due to _BQC is found to be broken
976 * in acpi_video_bqc_quirk, so check again here.
977 */
978 if (!device->cap._BQC)
979 goto set_level;
980
981 level = acpi_video_bqc_value_to_level(device, level_old);
982 /*
983 * On some buggy laptops, _BQC returns an uninitialized
984 * value when invoked for the first time, i.e.
985 * level_old is invalid (no matter whether it's a level
986 * or an index). Set the backlight to max_level in this case.
987 */
988 for (i = 2; i < br->count; i++)
989 if (level == br->levels[i])
990 break;
991 if (i == br->count || !level)
992 level = max_level;
993
994 set_level:
995 result = acpi_video_device_lcd_set_level(device, level);
996 if (result)
997 goto out_free_levels;
998
999 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1000 "found %d brightness levels\n", count - 2));
1001 kfree(obj);
1002 return result;
1003
1004 out_free_levels:
1005 kfree(br->levels);
1006 out_free:
1007 kfree(br);
1008 out:
1009 device->brightness = NULL;
1010 kfree(obj);
1011 return result;
1012 }
1013
1014 /*
1015 * Arg:
1016 * device : video output device (LCD, CRT, ..)
1017 *
1018 * Return Value:
1019 * None
1020 *
1021 * Find out all required AML methods defined under the output
1022 * device.
1023 */
1024
1025 static void acpi_video_device_find_cap(struct acpi_video_device *device)
1026 {
1027 if (acpi_has_method(device->dev->handle, "_ADR"))
1028 device->cap._ADR = 1;
1029 if (acpi_has_method(device->dev->handle, "_BCL"))
1030 device->cap._BCL = 1;
1031 if (acpi_has_method(device->dev->handle, "_BCM"))
1032 device->cap._BCM = 1;
1033 if (acpi_has_method(device->dev->handle, "_BQC")) {
1034 device->cap._BQC = 1;
1035 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
1036 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
1037 device->cap._BCQ = 1;
1038 }
1039
1040 if (acpi_has_method(device->dev->handle, "_DDC"))
1041 device->cap._DDC = 1;
1042 }
1043
1044 /*
1045 * Arg:
1046 * device : video output device (VGA)
1047 *
1048 * Return Value:
1049 * None
1050 *
1051 * Find out all required AML methods defined under the video bus device.
1052 */
1053
1054 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1055 {
1056 if (acpi_has_method(video->device->handle, "_DOS"))
1057 video->cap._DOS = 1;
1058 if (acpi_has_method(video->device->handle, "_DOD"))
1059 video->cap._DOD = 1;
1060 if (acpi_has_method(video->device->handle, "_ROM"))
1061 video->cap._ROM = 1;
1062 if (acpi_has_method(video->device->handle, "_GPD"))
1063 video->cap._GPD = 1;
1064 if (acpi_has_method(video->device->handle, "_SPD"))
1065 video->cap._SPD = 1;
1066 if (acpi_has_method(video->device->handle, "_VPO"))
1067 video->cap._VPO = 1;
1068 }
1069
1070 /*
1071 * Check whether the video bus device has required AML method to
1072 * support the desired features
1073 */
1074
1075 static int acpi_video_bus_check(struct acpi_video_bus *video)
1076 {
1077 acpi_status status = -ENOENT;
1078 struct pci_dev *dev;
1079
1080 if (!video)
1081 return -EINVAL;
1082
1083 dev = acpi_get_pci_dev(video->device->handle);
1084 if (!dev)
1085 return -ENODEV;
1086 pci_dev_put(dev);
1087
1088 /*
1089 * Since there is no HID, CID and so on for VGA driver, we have
1090 * to check well known required nodes.
1091 */
1092
1093 /* Does this device support video switching? */
1094 if (video->cap._DOS || video->cap._DOD) {
1095 if (!video->cap._DOS) {
1096 printk(KERN_WARNING FW_BUG
1097 "ACPI(%s) defines _DOD but not _DOS\n",
1098 acpi_device_bid(video->device));
1099 }
1100 video->flags.multihead = 1;
1101 status = 0;
1102 }
1103
1104 /* Does this device support retrieving a video ROM? */
1105 if (video->cap._ROM) {
1106 video->flags.rom = 1;
1107 status = 0;
1108 }
1109
1110 /* Does this device support configuring which video device to POST? */
1111 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1112 video->flags.post = 1;
1113 status = 0;
1114 }
1115
1116 return status;
1117 }
1118
1119 /*
1120 * --------------------------------------------------------------------------
1121 * Driver Interface
1122 * --------------------------------------------------------------------------
1123 */
1124
1125 /* device interface */
1126 static struct acpi_video_device_attrib *
1127 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1128 {
1129 struct acpi_video_enumerated_device *ids;
1130 int i;
1131
1132 for (i = 0; i < video->attached_count; i++) {
1133 ids = &video->attached_array[i];
1134 if ((ids->value.int_val & 0xffff) == device_id)
1135 return &ids->value.attrib;
1136 }
1137
1138 return NULL;
1139 }
1140
1141 static int
1142 acpi_video_get_device_type(struct acpi_video_bus *video,
1143 unsigned long device_id)
1144 {
1145 struct acpi_video_enumerated_device *ids;
1146 int i;
1147
1148 for (i = 0; i < video->attached_count; i++) {
1149 ids = &video->attached_array[i];
1150 if ((ids->value.int_val & 0xffff) == device_id)
1151 return ids->value.int_val;
1152 }
1153
1154 return 0;
1155 }
1156
1157 static int
1158 acpi_video_bus_get_one_device(struct acpi_device *device,
1159 struct acpi_video_bus *video)
1160 {
1161 unsigned long long device_id;
1162 int status, device_type;
1163 struct acpi_video_device *data;
1164 struct acpi_video_device_attrib *attribute;
1165
1166 status =
1167 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1168 /* Some device omits _ADR, we skip them instead of fail */
1169 if (ACPI_FAILURE(status))
1170 return 0;
1171
1172 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1173 if (!data)
1174 return -ENOMEM;
1175
1176 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1177 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1178 device->driver_data = data;
1179
1180 data->device_id = device_id;
1181 data->video = video;
1182 data->dev = device;
1183
1184 attribute = acpi_video_get_device_attr(video, device_id);
1185
1186 if (attribute && attribute->device_id_scheme) {
1187 switch (attribute->display_type) {
1188 case ACPI_VIDEO_DISPLAY_CRT:
1189 data->flags.crt = 1;
1190 break;
1191 case ACPI_VIDEO_DISPLAY_TV:
1192 data->flags.tvout = 1;
1193 break;
1194 case ACPI_VIDEO_DISPLAY_DVI:
1195 data->flags.dvi = 1;
1196 break;
1197 case ACPI_VIDEO_DISPLAY_LCD:
1198 data->flags.lcd = 1;
1199 break;
1200 default:
1201 data->flags.unknown = 1;
1202 break;
1203 }
1204 if (attribute->bios_can_detect)
1205 data->flags.bios = 1;
1206 } else {
1207 /* Check for legacy IDs */
1208 device_type = acpi_video_get_device_type(video, device_id);
1209 /* Ignore bits 16 and 18-20 */
1210 switch (device_type & 0xffe2ffff) {
1211 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1212 data->flags.crt = 1;
1213 break;
1214 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1215 data->flags.lcd = 1;
1216 break;
1217 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1218 data->flags.tvout = 1;
1219 break;
1220 default:
1221 data->flags.unknown = 1;
1222 }
1223 }
1224
1225 acpi_video_device_bind(video, data);
1226 acpi_video_device_find_cap(data);
1227
1228 mutex_lock(&video->device_list_lock);
1229 list_add_tail(&data->entry, &video->video_device_list);
1230 mutex_unlock(&video->device_list_lock);
1231
1232 return status;
1233 }
1234
1235 /*
1236 * Arg:
1237 * video : video bus device
1238 *
1239 * Return:
1240 * none
1241 *
1242 * Enumerate the video device list of the video bus,
1243 * bind the ids with the corresponding video devices
1244 * under the video bus.
1245 */
1246
1247 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1248 {
1249 struct acpi_video_device *dev;
1250
1251 mutex_lock(&video->device_list_lock);
1252
1253 list_for_each_entry(dev, &video->video_device_list, entry)
1254 acpi_video_device_bind(video, dev);
1255
1256 mutex_unlock(&video->device_list_lock);
1257 }
1258
1259 /*
1260 * Arg:
1261 * video : video bus device
1262 * device : video output device under the video
1263 * bus
1264 *
1265 * Return:
1266 * none
1267 *
1268 * Bind the ids with the corresponding video devices
1269 * under the video bus.
1270 */
1271
1272 static void
1273 acpi_video_device_bind(struct acpi_video_bus *video,
1274 struct acpi_video_device *device)
1275 {
1276 struct acpi_video_enumerated_device *ids;
1277 int i;
1278
1279 for (i = 0; i < video->attached_count; i++) {
1280 ids = &video->attached_array[i];
1281 if (device->device_id == (ids->value.int_val & 0xffff)) {
1282 ids->bind_info = device;
1283 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1284 }
1285 }
1286 }
1287
1288 /*
1289 * Arg:
1290 * video : video bus device
1291 *
1292 * Return:
1293 * < 0 : error
1294 *
1295 * Call _DOD to enumerate all devices attached to display adapter
1296 *
1297 */
1298
1299 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1300 {
1301 int status;
1302 int count;
1303 int i;
1304 struct acpi_video_enumerated_device *active_list;
1305 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1306 union acpi_object *dod = NULL;
1307 union acpi_object *obj;
1308
1309 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1310 if (!ACPI_SUCCESS(status)) {
1311 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1312 return status;
1313 }
1314
1315 dod = buffer.pointer;
1316 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1317 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1318 status = -EFAULT;
1319 goto out;
1320 }
1321
1322 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1323 dod->package.count));
1324
1325 active_list = kcalloc(1 + dod->package.count,
1326 sizeof(struct acpi_video_enumerated_device),
1327 GFP_KERNEL);
1328 if (!active_list) {
1329 status = -ENOMEM;
1330 goto out;
1331 }
1332
1333 count = 0;
1334 for (i = 0; i < dod->package.count; i++) {
1335 obj = &dod->package.elements[i];
1336
1337 if (obj->type != ACPI_TYPE_INTEGER) {
1338 printk(KERN_ERR PREFIX
1339 "Invalid _DOD data in element %d\n", i);
1340 continue;
1341 }
1342
1343 active_list[count].value.int_val = obj->integer.value;
1344 active_list[count].bind_info = NULL;
1345 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1346 (int)obj->integer.value));
1347 count++;
1348 }
1349
1350 kfree(video->attached_array);
1351
1352 video->attached_array = active_list;
1353 video->attached_count = count;
1354
1355 out:
1356 kfree(buffer.pointer);
1357 return status;
1358 }
1359
1360 static int
1361 acpi_video_get_next_level(struct acpi_video_device *device,
1362 u32 level_current, u32 event)
1363 {
1364 int min, max, min_above, max_below, i, l, delta = 255;
1365 max = max_below = 0;
1366 min = min_above = 255;
1367 /* Find closest level to level_current */
1368 for (i = 2; i < device->brightness->count; i++) {
1369 l = device->brightness->levels[i];
1370 if (abs(l - level_current) < abs(delta)) {
1371 delta = l - level_current;
1372 if (!delta)
1373 break;
1374 }
1375 }
1376 /* Ajust level_current to closest available level */
1377 level_current += delta;
1378 for (i = 2; i < device->brightness->count; i++) {
1379 l = device->brightness->levels[i];
1380 if (l < min)
1381 min = l;
1382 if (l > max)
1383 max = l;
1384 if (l < min_above && l > level_current)
1385 min_above = l;
1386 if (l > max_below && l < level_current)
1387 max_below = l;
1388 }
1389
1390 switch (event) {
1391 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1392 return (level_current < max) ? min_above : min;
1393 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1394 return (level_current < max) ? min_above : max;
1395 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1396 return (level_current > min) ? max_below : min;
1397 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1398 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1399 return 0;
1400 default:
1401 return level_current;
1402 }
1403 }
1404
1405 static int
1406 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1407 {
1408 unsigned long long level_current, level_next;
1409 int result = -EINVAL;
1410
1411 /* no warning message if acpi_backlight=vendor or a quirk is used */
1412 if (!acpi_video_verify_backlight_support())
1413 return 0;
1414
1415 if (!device->brightness)
1416 goto out;
1417
1418 result = acpi_video_device_lcd_get_level_current(device,
1419 &level_current,
1420 false);
1421 if (result)
1422 goto out;
1423
1424 level_next = acpi_video_get_next_level(device, level_current, event);
1425
1426 result = acpi_video_device_lcd_set_level(device, level_next);
1427
1428 if (!result)
1429 backlight_force_update(device->backlight,
1430 BACKLIGHT_UPDATE_HOTKEY);
1431
1432 out:
1433 if (result)
1434 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1435
1436 return result;
1437 }
1438
1439 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1440 void **edid)
1441 {
1442 struct acpi_video_bus *video;
1443 struct acpi_video_device *video_device;
1444 union acpi_object *buffer = NULL;
1445 acpi_status status;
1446 int i, length;
1447
1448 if (!device || !acpi_driver_data(device))
1449 return -EINVAL;
1450
1451 video = acpi_driver_data(device);
1452
1453 for (i = 0; i < video->attached_count; i++) {
1454 video_device = video->attached_array[i].bind_info;
1455 length = 256;
1456
1457 if (!video_device)
1458 continue;
1459
1460 if (!video_device->cap._DDC)
1461 continue;
1462
1463 if (type) {
1464 switch (type) {
1465 case ACPI_VIDEO_DISPLAY_CRT:
1466 if (!video_device->flags.crt)
1467 continue;
1468 break;
1469 case ACPI_VIDEO_DISPLAY_TV:
1470 if (!video_device->flags.tvout)
1471 continue;
1472 break;
1473 case ACPI_VIDEO_DISPLAY_DVI:
1474 if (!video_device->flags.dvi)
1475 continue;
1476 break;
1477 case ACPI_VIDEO_DISPLAY_LCD:
1478 if (!video_device->flags.lcd)
1479 continue;
1480 break;
1481 }
1482 } else if (video_device->device_id != device_id) {
1483 continue;
1484 }
1485
1486 status = acpi_video_device_EDID(video_device, &buffer, length);
1487
1488 if (ACPI_FAILURE(status) || !buffer ||
1489 buffer->type != ACPI_TYPE_BUFFER) {
1490 length = 128;
1491 status = acpi_video_device_EDID(video_device, &buffer,
1492 length);
1493 if (ACPI_FAILURE(status) || !buffer ||
1494 buffer->type != ACPI_TYPE_BUFFER) {
1495 continue;
1496 }
1497 }
1498
1499 *edid = buffer->buffer.pointer;
1500 return length;
1501 }
1502
1503 return -ENODEV;
1504 }
1505 EXPORT_SYMBOL(acpi_video_get_edid);
1506
1507 static int
1508 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1509 struct acpi_device *device)
1510 {
1511 int status = 0;
1512 struct acpi_device *dev;
1513
1514 /*
1515 * There are systems where video module known to work fine regardless
1516 * of broken _DOD and ignoring returned value here doesn't cause
1517 * any issues later.
1518 */
1519 acpi_video_device_enumerate(video);
1520
1521 list_for_each_entry(dev, &device->children, node) {
1522
1523 status = acpi_video_bus_get_one_device(dev, video);
1524 if (status) {
1525 dev_err(&dev->dev, "Can't attach device\n");
1526 break;
1527 }
1528 }
1529 return status;
1530 }
1531
1532 /* acpi_video interface */
1533
1534 /*
1535 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1536 * preform any automatic brightness change on receiving a notification.
1537 */
1538 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1539 {
1540 return acpi_video_bus_DOS(video, 0,
1541 acpi_osi_is_win8() ? 1 : 0);
1542 }
1543
1544 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1545 {
1546 return acpi_video_bus_DOS(video, 0,
1547 acpi_osi_is_win8() ? 0 : 1);
1548 }
1549
1550 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1551 {
1552 struct acpi_video_bus *video = acpi_driver_data(device);
1553 struct input_dev *input;
1554 int keycode = 0;
1555
1556 if (!video || !video->input)
1557 return;
1558
1559 input = video->input;
1560
1561 switch (event) {
1562 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1563 * most likely via hotkey. */
1564 keycode = KEY_SWITCHVIDEOMODE;
1565 break;
1566
1567 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1568 * connector. */
1569 acpi_video_device_enumerate(video);
1570 acpi_video_device_rebind(video);
1571 keycode = KEY_SWITCHVIDEOMODE;
1572 break;
1573
1574 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1575 keycode = KEY_SWITCHVIDEOMODE;
1576 break;
1577 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1578 keycode = KEY_VIDEO_NEXT;
1579 break;
1580 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1581 keycode = KEY_VIDEO_PREV;
1582 break;
1583
1584 default:
1585 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1586 "Unsupported event [0x%x]\n", event));
1587 break;
1588 }
1589
1590 if (acpi_notifier_call_chain(device, event, 0))
1591 /* Something vetoed the keypress. */
1592 keycode = 0;
1593
1594 if (keycode) {
1595 input_report_key(input, keycode, 1);
1596 input_sync(input);
1597 input_report_key(input, keycode, 0);
1598 input_sync(input);
1599 }
1600
1601 return;
1602 }
1603
1604 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1605 {
1606 struct acpi_video_device *video_device = data;
1607 struct acpi_device *device = NULL;
1608 struct acpi_video_bus *bus;
1609 struct input_dev *input;
1610 int keycode = 0;
1611
1612 if (!video_device)
1613 return;
1614
1615 device = video_device->dev;
1616 bus = video_device->video;
1617 input = bus->input;
1618
1619 switch (event) {
1620 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1621 if (brightness_switch_enabled)
1622 acpi_video_switch_brightness(video_device, event);
1623 keycode = KEY_BRIGHTNESS_CYCLE;
1624 break;
1625 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1626 if (brightness_switch_enabled)
1627 acpi_video_switch_brightness(video_device, event);
1628 keycode = KEY_BRIGHTNESSUP;
1629 break;
1630 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1631 if (brightness_switch_enabled)
1632 acpi_video_switch_brightness(video_device, event);
1633 keycode = KEY_BRIGHTNESSDOWN;
1634 break;
1635 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1636 if (brightness_switch_enabled)
1637 acpi_video_switch_brightness(video_device, event);
1638 keycode = KEY_BRIGHTNESS_ZERO;
1639 break;
1640 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1641 if (brightness_switch_enabled)
1642 acpi_video_switch_brightness(video_device, event);
1643 keycode = KEY_DISPLAY_OFF;
1644 break;
1645 default:
1646 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1647 "Unsupported event [0x%x]\n", event));
1648 break;
1649 }
1650
1651 acpi_notifier_call_chain(device, event, 0);
1652
1653 if (keycode) {
1654 input_report_key(input, keycode, 1);
1655 input_sync(input);
1656 input_report_key(input, keycode, 0);
1657 input_sync(input);
1658 }
1659
1660 return;
1661 }
1662
1663 static int acpi_video_resume(struct notifier_block *nb,
1664 unsigned long val, void *ign)
1665 {
1666 struct acpi_video_bus *video;
1667 struct acpi_video_device *video_device;
1668 int i;
1669
1670 switch (val) {
1671 case PM_HIBERNATION_PREPARE:
1672 case PM_SUSPEND_PREPARE:
1673 case PM_RESTORE_PREPARE:
1674 return NOTIFY_DONE;
1675 }
1676
1677 video = container_of(nb, struct acpi_video_bus, pm_nb);
1678
1679 dev_info(&video->device->dev, "Restoring backlight state\n");
1680
1681 for (i = 0; i < video->attached_count; i++) {
1682 video_device = video->attached_array[i].bind_info;
1683 if (video_device && video_device->backlight)
1684 acpi_video_set_brightness(video_device->backlight);
1685 }
1686
1687 return NOTIFY_OK;
1688 }
1689
1690 static acpi_status
1691 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1692 void **return_value)
1693 {
1694 struct acpi_device *device = context;
1695 struct acpi_device *sibling;
1696 int result;
1697
1698 if (handle == device->handle)
1699 return AE_CTRL_TERMINATE;
1700
1701 result = acpi_bus_get_device(handle, &sibling);
1702 if (result)
1703 return AE_OK;
1704
1705 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1706 return AE_ALREADY_EXISTS;
1707
1708 return AE_OK;
1709 }
1710
1711 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1712 {
1713 struct backlight_properties props;
1714 struct pci_dev *pdev;
1715 acpi_handle acpi_parent;
1716 struct device *parent = NULL;
1717 int result;
1718 static int count;
1719 char *name;
1720
1721 result = acpi_video_init_brightness(device);
1722 if (result)
1723 return;
1724 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1725 if (!name)
1726 return;
1727 count++;
1728
1729 acpi_get_parent(device->dev->handle, &acpi_parent);
1730
1731 pdev = acpi_get_pci_dev(acpi_parent);
1732 if (pdev) {
1733 parent = &pdev->dev;
1734 pci_dev_put(pdev);
1735 }
1736
1737 memset(&props, 0, sizeof(struct backlight_properties));
1738 props.type = BACKLIGHT_FIRMWARE;
1739 props.max_brightness = device->brightness->count - 3;
1740 device->backlight = backlight_device_register(name,
1741 parent,
1742 device,
1743 &acpi_backlight_ops,
1744 &props);
1745 kfree(name);
1746 if (IS_ERR(device->backlight))
1747 return;
1748
1749 /*
1750 * Save current brightness level in case we have to restore it
1751 * before acpi_video_device_lcd_set_level() is called next time.
1752 */
1753 device->backlight->props.brightness =
1754 acpi_video_get_brightness(device->backlight);
1755
1756 device->cooling_dev = thermal_cooling_device_register("LCD",
1757 device->dev, &video_cooling_ops);
1758 if (IS_ERR(device->cooling_dev)) {
1759 /*
1760 * Set cooling_dev to NULL so we don't crash trying to free it.
1761 * Also, why the hell we are returning early and not attempt to
1762 * register video output if cooling device registration failed?
1763 * -- dtor
1764 */
1765 device->cooling_dev = NULL;
1766 return;
1767 }
1768
1769 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1770 device->cooling_dev->id);
1771 result = sysfs_create_link(&device->dev->dev.kobj,
1772 &device->cooling_dev->device.kobj,
1773 "thermal_cooling");
1774 if (result)
1775 printk(KERN_ERR PREFIX "Create sysfs link\n");
1776 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1777 &device->dev->dev.kobj, "device");
1778 if (result)
1779 printk(KERN_ERR PREFIX "Create sysfs link\n");
1780 }
1781
1782 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1783 {
1784 struct acpi_video_device *dev;
1785
1786 if (video->backlight_registered)
1787 return 0;
1788
1789 if (!acpi_video_verify_backlight_support())
1790 return 0;
1791
1792 mutex_lock(&video->device_list_lock);
1793 list_for_each_entry(dev, &video->video_device_list, entry)
1794 acpi_video_dev_register_backlight(dev);
1795 mutex_unlock(&video->device_list_lock);
1796
1797 video->backlight_registered = true;
1798
1799 video->pm_nb.notifier_call = acpi_video_resume;
1800 video->pm_nb.priority = 0;
1801 return register_pm_notifier(&video->pm_nb);
1802 }
1803
1804 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1805 {
1806 if (device->backlight) {
1807 backlight_device_unregister(device->backlight);
1808 device->backlight = NULL;
1809 }
1810 if (device->brightness) {
1811 kfree(device->brightness->levels);
1812 kfree(device->brightness);
1813 device->brightness = NULL;
1814 }
1815 if (device->cooling_dev) {
1816 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1817 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1818 thermal_cooling_device_unregister(device->cooling_dev);
1819 device->cooling_dev = NULL;
1820 }
1821 }
1822
1823 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1824 {
1825 struct acpi_video_device *dev;
1826 int error;
1827
1828 if (!video->backlight_registered)
1829 return 0;
1830
1831 error = unregister_pm_notifier(&video->pm_nb);
1832
1833 mutex_lock(&video->device_list_lock);
1834 list_for_each_entry(dev, &video->video_device_list, entry)
1835 acpi_video_dev_unregister_backlight(dev);
1836 mutex_unlock(&video->device_list_lock);
1837
1838 video->backlight_registered = false;
1839
1840 return error;
1841 }
1842
1843 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1844 {
1845 acpi_status status;
1846 struct acpi_device *adev = device->dev;
1847
1848 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1849 acpi_video_device_notify, device);
1850 if (ACPI_FAILURE(status))
1851 dev_err(&adev->dev, "Error installing notify handler\n");
1852 else
1853 device->flags.notify = 1;
1854 }
1855
1856 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1857 {
1858 struct input_dev *input;
1859 struct acpi_video_device *dev;
1860 int error;
1861
1862 video->input = input = input_allocate_device();
1863 if (!input) {
1864 error = -ENOMEM;
1865 goto out;
1866 }
1867
1868 error = acpi_video_bus_start_devices(video);
1869 if (error)
1870 goto err_free_input;
1871
1872 snprintf(video->phys, sizeof(video->phys),
1873 "%s/video/input0", acpi_device_hid(video->device));
1874
1875 input->name = acpi_device_name(video->device);
1876 input->phys = video->phys;
1877 input->id.bustype = BUS_HOST;
1878 input->id.product = 0x06;
1879 input->dev.parent = &video->device->dev;
1880 input->evbit[0] = BIT(EV_KEY);
1881 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1882 set_bit(KEY_VIDEO_NEXT, input->keybit);
1883 set_bit(KEY_VIDEO_PREV, input->keybit);
1884 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1885 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1886 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1887 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1888 set_bit(KEY_DISPLAY_OFF, input->keybit);
1889
1890 error = input_register_device(input);
1891 if (error)
1892 goto err_stop_dev;
1893
1894 mutex_lock(&video->device_list_lock);
1895 list_for_each_entry(dev, &video->video_device_list, entry)
1896 acpi_video_dev_add_notify_handler(dev);
1897 mutex_unlock(&video->device_list_lock);
1898
1899 return 0;
1900
1901 err_stop_dev:
1902 acpi_video_bus_stop_devices(video);
1903 err_free_input:
1904 input_free_device(input);
1905 video->input = NULL;
1906 out:
1907 return error;
1908 }
1909
1910 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1911 {
1912 if (dev->flags.notify) {
1913 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1914 acpi_video_device_notify);
1915 dev->flags.notify = 0;
1916 }
1917 }
1918
1919 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1920 {
1921 struct acpi_video_device *dev;
1922
1923 mutex_lock(&video->device_list_lock);
1924 list_for_each_entry(dev, &video->video_device_list, entry)
1925 acpi_video_dev_remove_notify_handler(dev);
1926 mutex_unlock(&video->device_list_lock);
1927
1928 acpi_video_bus_stop_devices(video);
1929 input_unregister_device(video->input);
1930 video->input = NULL;
1931 }
1932
1933 static int acpi_video_backlight_notify(struct notifier_block *nb,
1934 unsigned long val, void *bd)
1935 {
1936 struct backlight_device *backlight = bd;
1937 struct acpi_video_bus *video;
1938
1939 /* acpi_video_verify_backlight_support only cares about raw devices */
1940 if (backlight->props.type != BACKLIGHT_RAW)
1941 return NOTIFY_DONE;
1942
1943 video = container_of(nb, struct acpi_video_bus, backlight_nb);
1944
1945 switch (val) {
1946 case BACKLIGHT_REGISTERED:
1947 if (!acpi_video_verify_backlight_support())
1948 acpi_video_bus_unregister_backlight(video);
1949 break;
1950 case BACKLIGHT_UNREGISTERED:
1951 acpi_video_bus_register_backlight(video);
1952 break;
1953 }
1954
1955 return NOTIFY_OK;
1956 }
1957
1958 static int acpi_video_bus_add_backlight_notify_handler(
1959 struct acpi_video_bus *video)
1960 {
1961 int error;
1962
1963 video->backlight_nb.notifier_call = acpi_video_backlight_notify;
1964 video->backlight_nb.priority = 0;
1965 error = backlight_register_notifier(&video->backlight_nb);
1966 if (error == 0)
1967 video->backlight_notifier_registered = true;
1968
1969 return error;
1970 }
1971
1972 static int acpi_video_bus_remove_backlight_notify_handler(
1973 struct acpi_video_bus *video)
1974 {
1975 if (!video->backlight_notifier_registered)
1976 return 0;
1977
1978 video->backlight_notifier_registered = false;
1979
1980 return backlight_unregister_notifier(&video->backlight_nb);
1981 }
1982
1983 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1984 {
1985 struct acpi_video_device *dev, *next;
1986
1987 mutex_lock(&video->device_list_lock);
1988 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1989 list_del(&dev->entry);
1990 kfree(dev);
1991 }
1992 mutex_unlock(&video->device_list_lock);
1993
1994 return 0;
1995 }
1996
1997 static int instance;
1998
1999 static int acpi_video_bus_add(struct acpi_device *device)
2000 {
2001 struct acpi_video_bus *video;
2002 int error;
2003 acpi_status status;
2004
2005 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
2006 device->parent->handle, 1,
2007 acpi_video_bus_match, NULL,
2008 device, NULL);
2009 if (status == AE_ALREADY_EXISTS) {
2010 printk(KERN_WARNING FW_BUG
2011 "Duplicate ACPI video bus devices for the"
2012 " same VGA controller, please try module "
2013 "parameter \"video.allow_duplicates=1\""
2014 "if the current driver doesn't work.\n");
2015 if (!allow_duplicates)
2016 return -ENODEV;
2017 }
2018
2019 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2020 if (!video)
2021 return -ENOMEM;
2022
2023 /* a hack to fix the duplicate name "VID" problem on T61 */
2024 if (!strcmp(device->pnp.bus_id, "VID")) {
2025 if (instance)
2026 device->pnp.bus_id[3] = '0' + instance;
2027 instance++;
2028 }
2029 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2030 if (!strcmp(device->pnp.bus_id, "VGA")) {
2031 if (instance)
2032 device->pnp.bus_id[3] = '0' + instance;
2033 instance++;
2034 }
2035
2036 video->device = device;
2037 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2038 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2039 device->driver_data = video;
2040
2041 acpi_video_bus_find_cap(video);
2042 error = acpi_video_bus_check(video);
2043 if (error)
2044 goto err_free_video;
2045
2046 mutex_init(&video->device_list_lock);
2047 INIT_LIST_HEAD(&video->video_device_list);
2048
2049 error = acpi_video_bus_get_devices(video, device);
2050 if (error)
2051 goto err_put_video;
2052
2053 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
2054 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2055 video->flags.multihead ? "yes" : "no",
2056 video->flags.rom ? "yes" : "no",
2057 video->flags.post ? "yes" : "no");
2058 mutex_lock(&video_list_lock);
2059 list_add_tail(&video->entry, &video_bus_head);
2060 mutex_unlock(&video_list_lock);
2061
2062 acpi_video_bus_register_backlight(video);
2063 acpi_video_bus_add_notify_handler(video);
2064 acpi_video_bus_add_backlight_notify_handler(video);
2065
2066 return 0;
2067
2068 err_put_video:
2069 acpi_video_bus_put_devices(video);
2070 kfree(video->attached_array);
2071 err_free_video:
2072 kfree(video);
2073 device->driver_data = NULL;
2074
2075 return error;
2076 }
2077
2078 static int acpi_video_bus_remove(struct acpi_device *device)
2079 {
2080 struct acpi_video_bus *video = NULL;
2081
2082
2083 if (!device || !acpi_driver_data(device))
2084 return -EINVAL;
2085
2086 video = acpi_driver_data(device);
2087
2088 acpi_video_bus_remove_backlight_notify_handler(video);
2089 acpi_video_bus_remove_notify_handler(video);
2090 acpi_video_bus_unregister_backlight(video);
2091 acpi_video_bus_put_devices(video);
2092
2093 mutex_lock(&video_list_lock);
2094 list_del(&video->entry);
2095 mutex_unlock(&video_list_lock);
2096
2097 kfree(video->attached_array);
2098 kfree(video);
2099
2100 return 0;
2101 }
2102
2103 static int __init is_i740(struct pci_dev *dev)
2104 {
2105 if (dev->device == 0x00D1)
2106 return 1;
2107 if (dev->device == 0x7000)
2108 return 1;
2109 return 0;
2110 }
2111
2112 static int __init intel_opregion_present(void)
2113 {
2114 int opregion = 0;
2115 struct pci_dev *dev = NULL;
2116 u32 address;
2117
2118 for_each_pci_dev(dev) {
2119 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2120 continue;
2121 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2122 continue;
2123 /* We don't want to poke around undefined i740 registers */
2124 if (is_i740(dev))
2125 continue;
2126 pci_read_config_dword(dev, 0xfc, &address);
2127 if (!address)
2128 continue;
2129 opregion = 1;
2130 }
2131 return opregion;
2132 }
2133
2134 int acpi_video_register(void)
2135 {
2136 int result = 0;
2137 if (register_count) {
2138 /*
2139 * if the function of acpi_video_register is already called,
2140 * don't register the acpi_vide_bus again and return no error.
2141 */
2142 return 0;
2143 }
2144
2145 mutex_init(&video_list_lock);
2146 INIT_LIST_HEAD(&video_bus_head);
2147
2148 result = acpi_bus_register_driver(&acpi_video_bus);
2149 if (result < 0)
2150 return -ENODEV;
2151
2152 /*
2153 * When the acpi_video_bus is loaded successfully, increase
2154 * the counter reference.
2155 */
2156 register_count = 1;
2157
2158 return 0;
2159 }
2160 EXPORT_SYMBOL(acpi_video_register);
2161
2162 void acpi_video_unregister(void)
2163 {
2164 if (!register_count) {
2165 /*
2166 * If the acpi video bus is already unloaded, don't
2167 * unload it again and return directly.
2168 */
2169 return;
2170 }
2171 acpi_bus_unregister_driver(&acpi_video_bus);
2172
2173 register_count = 0;
2174
2175 return;
2176 }
2177 EXPORT_SYMBOL(acpi_video_unregister);
2178
2179 void acpi_video_unregister_backlight(void)
2180 {
2181 struct acpi_video_bus *video;
2182
2183 if (!register_count)
2184 return;
2185
2186 mutex_lock(&video_list_lock);
2187 list_for_each_entry(video, &video_bus_head, entry)
2188 acpi_video_bus_unregister_backlight(video);
2189 mutex_unlock(&video_list_lock);
2190 }
2191 EXPORT_SYMBOL(acpi_video_unregister_backlight);
2192
2193 /*
2194 * This is kind of nasty. Hardware using Intel chipsets may require
2195 * the video opregion code to be run first in order to initialise
2196 * state before any ACPI video calls are made. To handle this we defer
2197 * registration of the video class until the opregion code has run.
2198 */
2199
2200 static int __init acpi_video_init(void)
2201 {
2202 dmi_check_system(video_dmi_table);
2203
2204 if (intel_opregion_present())
2205 return 0;
2206
2207 return acpi_video_register();
2208 }
2209
2210 static void __exit acpi_video_exit(void)
2211 {
2212 acpi_video_unregister();
2213
2214 return;
2215 }
2216
2217 module_init(acpi_video_init);
2218 module_exit(acpi_video_exit);
Linux kernel - Deliverables
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