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Merge tag 'xfs-for-linus-3.17-rc1' of git://oss.sgi.com/xfs/xfs
[mirror_ubuntu-bionic-kernel.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 = 1;
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 delayed_work switch_brightness_work;
208 int switch_brightness_event;
209 struct acpi_video_bus *video;
210 struct acpi_device *dev;
211 struct acpi_video_device_brightness *brightness;
212 struct backlight_device *backlight;
213 struct thermal_cooling_device *cooling_dev;
214 };
215
216 static const char device_decode[][30] = {
217 "motherboard VGA device",
218 "PCI VGA device",
219 "AGP VGA device",
220 "UNKNOWN",
221 };
222
223 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
224 static void acpi_video_device_rebind(struct acpi_video_bus *video);
225 static void acpi_video_device_bind(struct acpi_video_bus *video,
226 struct acpi_video_device *device);
227 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
228 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
229 int level);
230 static int acpi_video_device_lcd_get_level_current(
231 struct acpi_video_device *device,
232 unsigned long long *level, bool raw);
233 static int acpi_video_get_next_level(struct acpi_video_device *device,
234 u32 level_current, u32 event);
235 static void acpi_video_switch_brightness(struct work_struct *work);
236
237 static bool acpi_video_use_native_backlight(void)
238 {
239 if (use_native_backlight_param != -1)
240 return use_native_backlight_param;
241 else
242 return use_native_backlight_dmi;
243 }
244
245 bool acpi_video_verify_backlight_support(void)
246 {
247 if (acpi_osi_is_win8() && acpi_video_use_native_backlight() &&
248 backlight_device_registered(BACKLIGHT_RAW))
249 return false;
250 return acpi_video_backlight_support();
251 }
252 EXPORT_SYMBOL_GPL(acpi_video_verify_backlight_support);
253
254 /* backlight device sysfs support */
255 static int acpi_video_get_brightness(struct backlight_device *bd)
256 {
257 unsigned long long cur_level;
258 int i;
259 struct acpi_video_device *vd = bl_get_data(bd);
260
261 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
262 return -EINVAL;
263 for (i = 2; i < vd->brightness->count; i++) {
264 if (vd->brightness->levels[i] == cur_level)
265 /*
266 * The first two entries are special - see page 575
267 * of the ACPI spec 3.0
268 */
269 return i - 2;
270 }
271 return 0;
272 }
273
274 static int acpi_video_set_brightness(struct backlight_device *bd)
275 {
276 int request_level = bd->props.brightness + 2;
277 struct acpi_video_device *vd = bl_get_data(bd);
278
279 cancel_delayed_work(&vd->switch_brightness_work);
280 return acpi_video_device_lcd_set_level(vd,
281 vd->brightness->levels[request_level]);
282 }
283
284 static const struct backlight_ops acpi_backlight_ops = {
285 .get_brightness = acpi_video_get_brightness,
286 .update_status = acpi_video_set_brightness,
287 };
288
289 /* thermal cooling device callbacks */
290 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
291 long *state)
292 {
293 struct acpi_device *device = cooling_dev->devdata;
294 struct acpi_video_device *video = acpi_driver_data(device);
295
296 *state = video->brightness->count - 3;
297 return 0;
298 }
299
300 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
301 long *state)
302 {
303 struct acpi_device *device = cooling_dev->devdata;
304 struct acpi_video_device *video = acpi_driver_data(device);
305 unsigned long long level;
306 int offset;
307
308 if (acpi_video_device_lcd_get_level_current(video, &level, false))
309 return -EINVAL;
310 for (offset = 2; offset < video->brightness->count; offset++)
311 if (level == video->brightness->levels[offset]) {
312 *state = video->brightness->count - offset - 1;
313 return 0;
314 }
315
316 return -EINVAL;
317 }
318
319 static int
320 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
321 {
322 struct acpi_device *device = cooling_dev->devdata;
323 struct acpi_video_device *video = acpi_driver_data(device);
324 int level;
325
326 if (state >= video->brightness->count - 2)
327 return -EINVAL;
328
329 state = video->brightness->count - state;
330 level = video->brightness->levels[state - 1];
331 return acpi_video_device_lcd_set_level(video, level);
332 }
333
334 static const struct thermal_cooling_device_ops video_cooling_ops = {
335 .get_max_state = video_get_max_state,
336 .get_cur_state = video_get_cur_state,
337 .set_cur_state = video_set_cur_state,
338 };
339
340 /*
341 * --------------------------------------------------------------------------
342 * Video Management
343 * --------------------------------------------------------------------------
344 */
345
346 static int
347 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
348 union acpi_object **levels)
349 {
350 int status;
351 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
352 union acpi_object *obj;
353
354
355 *levels = NULL;
356
357 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
358 if (!ACPI_SUCCESS(status))
359 return status;
360 obj = (union acpi_object *)buffer.pointer;
361 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
362 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
363 status = -EFAULT;
364 goto err;
365 }
366
367 *levels = obj;
368
369 return 0;
370
371 err:
372 kfree(buffer.pointer);
373
374 return status;
375 }
376
377 static int
378 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
379 {
380 int status;
381 int state;
382
383 status = acpi_execute_simple_method(device->dev->handle,
384 "_BCM", level);
385 if (ACPI_FAILURE(status)) {
386 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
387 return -EIO;
388 }
389
390 device->brightness->curr = level;
391 for (state = 2; state < device->brightness->count; state++)
392 if (level == device->brightness->levels[state]) {
393 if (device->backlight)
394 device->backlight->props.brightness = state - 2;
395 return 0;
396 }
397
398 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
399 return -EINVAL;
400 }
401
402 /*
403 * For some buggy _BQC methods, we need to add a constant value to
404 * the _BQC return value to get the actual current brightness level
405 */
406
407 static int bqc_offset_aml_bug_workaround;
408 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
409 {
410 bqc_offset_aml_bug_workaround = 9;
411 return 0;
412 }
413
414 static int __init video_set_use_native_backlight(const struct dmi_system_id *d)
415 {
416 use_native_backlight_dmi = true;
417 return 0;
418 }
419
420 static struct dmi_system_id video_dmi_table[] __initdata = {
421 /*
422 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
423 */
424 {
425 .callback = video_set_bqc_offset,
426 .ident = "Acer Aspire 5720",
427 .matches = {
428 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
429 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
430 },
431 },
432 {
433 .callback = video_set_bqc_offset,
434 .ident = "Acer Aspire 5710Z",
435 .matches = {
436 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
437 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
438 },
439 },
440 {
441 .callback = video_set_bqc_offset,
442 .ident = "eMachines E510",
443 .matches = {
444 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
445 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
446 },
447 },
448 {
449 .callback = video_set_bqc_offset,
450 .ident = "Acer Aspire 5315",
451 .matches = {
452 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
453 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
454 },
455 },
456 {
457 .callback = video_set_bqc_offset,
458 .ident = "Acer Aspire 7720",
459 .matches = {
460 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
461 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
462 },
463 },
464 {
465 .callback = video_set_use_native_backlight,
466 .ident = "ThinkPad X230",
467 .matches = {
468 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
469 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X230"),
470 },
471 },
472 {
473 .callback = video_set_use_native_backlight,
474 .ident = "ThinkPad T430 and T430s",
475 .matches = {
476 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
477 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T430"),
478 },
479 },
480 {
481 .callback = video_set_use_native_backlight,
482 .ident = "ThinkPad T430",
483 .matches = {
484 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
485 DMI_MATCH(DMI_PRODUCT_VERSION, "2349D15"),
486 },
487 },
488 {
489 .callback = video_set_use_native_backlight,
490 .ident = "ThinkPad T431s",
491 .matches = {
492 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
493 DMI_MATCH(DMI_PRODUCT_VERSION, "20AACTO1WW"),
494 },
495 },
496 {
497 .callback = video_set_use_native_backlight,
498 .ident = "ThinkPad Edge E530",
499 .matches = {
500 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
501 DMI_MATCH(DMI_PRODUCT_VERSION, "3259A2G"),
502 },
503 },
504 {
505 .callback = video_set_use_native_backlight,
506 .ident = "ThinkPad Edge E530",
507 .matches = {
508 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
509 DMI_MATCH(DMI_PRODUCT_VERSION, "3259CTO"),
510 },
511 },
512 {
513 .callback = video_set_use_native_backlight,
514 .ident = "ThinkPad Edge E530",
515 .matches = {
516 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
517 DMI_MATCH(DMI_PRODUCT_VERSION, "3259HJG"),
518 },
519 },
520 {
521 .callback = video_set_use_native_backlight,
522 .ident = "ThinkPad W530",
523 .matches = {
524 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
525 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad W530"),
526 },
527 },
528 {
529 .callback = video_set_use_native_backlight,
530 .ident = "ThinkPad X1 Carbon",
531 .matches = {
532 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
533 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X1 Carbon"),
534 },
535 },
536 {
537 .callback = video_set_use_native_backlight,
538 .ident = "Lenovo Yoga 13",
539 .matches = {
540 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
541 DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo IdeaPad Yoga 13"),
542 },
543 },
544 {
545 .callback = video_set_use_native_backlight,
546 .ident = "Lenovo Yoga 2 11",
547 .matches = {
548 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
549 DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo Yoga 2 11"),
550 },
551 },
552 {
553 .callback = video_set_use_native_backlight,
554 .ident = "Thinkpad Helix",
555 .matches = {
556 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
557 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad Helix"),
558 },
559 },
560 {
561 .callback = video_set_use_native_backlight,
562 .ident = "Dell Inspiron 7520",
563 .matches = {
564 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
565 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7520"),
566 },
567 },
568 {
569 .callback = video_set_use_native_backlight,
570 .ident = "Acer Aspire 5733Z",
571 .matches = {
572 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
573 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5733Z"),
574 },
575 },
576 {
577 .callback = video_set_use_native_backlight,
578 .ident = "Acer Aspire 5742G",
579 .matches = {
580 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
581 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5742G"),
582 },
583 },
584 {
585 .callback = video_set_use_native_backlight,
586 .ident = "Acer Aspire V5-171",
587 .matches = {
588 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
589 DMI_MATCH(DMI_PRODUCT_NAME, "V5-171"),
590 },
591 },
592 {
593 .callback = video_set_use_native_backlight,
594 .ident = "Acer Aspire V5-431",
595 .matches = {
596 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
597 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-431"),
598 },
599 },
600 {
601 .callback = video_set_use_native_backlight,
602 .ident = "Acer Aspire V5-471G",
603 .matches = {
604 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
605 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-471G"),
606 },
607 },
608 {
609 .callback = video_set_use_native_backlight,
610 .ident = "Acer TravelMate B113",
611 .matches = {
612 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
613 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate B113"),
614 },
615 },
616 {
617 .callback = video_set_use_native_backlight,
618 .ident = "Acer Aspire V5-572G",
619 .matches = {
620 DMI_MATCH(DMI_SYS_VENDOR, "Acer Aspire"),
621 DMI_MATCH(DMI_PRODUCT_VERSION, "V5-572G/Dazzle_CX"),
622 },
623 },
624 {
625 .callback = video_set_use_native_backlight,
626 .ident = "Acer Aspire V5-573G",
627 .matches = {
628 DMI_MATCH(DMI_SYS_VENDOR, "Acer Aspire"),
629 DMI_MATCH(DMI_PRODUCT_VERSION, "V5-573G/Dazzle_HW"),
630 },
631 },
632 {
633 .callback = video_set_use_native_backlight,
634 .ident = "ASUS Zenbook Prime UX31A",
635 .matches = {
636 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
637 DMI_MATCH(DMI_PRODUCT_NAME, "UX31A"),
638 },
639 },
640 {
641 .callback = video_set_use_native_backlight,
642 .ident = "HP ProBook 4340s",
643 .matches = {
644 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
645 DMI_MATCH(DMI_PRODUCT_VERSION, "HP ProBook 4340s"),
646 },
647 },
648 {
649 .callback = video_set_use_native_backlight,
650 .ident = "HP ProBook 4540s",
651 .matches = {
652 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
653 DMI_MATCH(DMI_PRODUCT_VERSION, "HP ProBook 4540s"),
654 },
655 },
656 {
657 .callback = video_set_use_native_backlight,
658 .ident = "HP ProBook 2013 models",
659 .matches = {
660 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
661 DMI_MATCH(DMI_PRODUCT_NAME, "HP ProBook "),
662 DMI_MATCH(DMI_PRODUCT_NAME, " G1"),
663 },
664 },
665 {
666 .callback = video_set_use_native_backlight,
667 .ident = "HP EliteBook 2013 models",
668 .matches = {
669 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
670 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook "),
671 DMI_MATCH(DMI_PRODUCT_NAME, " G1"),
672 },
673 },
674 {
675 .callback = video_set_use_native_backlight,
676 .ident = "HP EliteBook 2014 models",
677 .matches = {
678 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
679 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook "),
680 DMI_MATCH(DMI_PRODUCT_NAME, " G2"),
681 },
682 },
683 {
684 .callback = video_set_use_native_backlight,
685 .ident = "HP ZBook 14",
686 .matches = {
687 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
688 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 14"),
689 },
690 },
691 {
692 .callback = video_set_use_native_backlight,
693 .ident = "HP ZBook 15",
694 .matches = {
695 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
696 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 15"),
697 },
698 },
699 {
700 .callback = video_set_use_native_backlight,
701 .ident = "HP ZBook 17",
702 .matches = {
703 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
704 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 17"),
705 },
706 },
707 {
708 .callback = video_set_use_native_backlight,
709 .ident = "HP EliteBook 8470p",
710 .matches = {
711 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
712 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8470p"),
713 },
714 },
715 {
716 .callback = video_set_use_native_backlight,
717 .ident = "HP EliteBook 8780w",
718 .matches = {
719 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
720 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8780w"),
721 },
722 },
723 {}
724 };
725
726 static unsigned long long
727 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
728 unsigned long long bqc_value)
729 {
730 unsigned long long level;
731
732 if (device->brightness->flags._BQC_use_index) {
733 /*
734 * _BQC returns an index that doesn't account for
735 * the first 2 items with special meaning, so we need
736 * to compensate for that by offsetting ourselves
737 */
738 if (device->brightness->flags._BCL_reversed)
739 bqc_value = device->brightness->count - 3 - bqc_value;
740
741 level = device->brightness->levels[bqc_value + 2];
742 } else {
743 level = bqc_value;
744 }
745
746 level += bqc_offset_aml_bug_workaround;
747
748 return level;
749 }
750
751 static int
752 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
753 unsigned long long *level, bool raw)
754 {
755 acpi_status status = AE_OK;
756 int i;
757
758 if (device->cap._BQC || device->cap._BCQ) {
759 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
760
761 status = acpi_evaluate_integer(device->dev->handle, buf,
762 NULL, level);
763 if (ACPI_SUCCESS(status)) {
764 if (raw) {
765 /*
766 * Caller has indicated he wants the raw
767 * value returned by _BQC, so don't furtherly
768 * mess with the value.
769 */
770 return 0;
771 }
772
773 *level = acpi_video_bqc_value_to_level(device, *level);
774
775 for (i = 2; i < device->brightness->count; i++)
776 if (device->brightness->levels[i] == *level) {
777 device->brightness->curr = *level;
778 return 0;
779 }
780 /*
781 * BQC returned an invalid level.
782 * Stop using it.
783 */
784 ACPI_WARNING((AE_INFO,
785 "%s returned an invalid level",
786 buf));
787 device->cap._BQC = device->cap._BCQ = 0;
788 } else {
789 /*
790 * Fixme:
791 * should we return an error or ignore this failure?
792 * dev->brightness->curr is a cached value which stores
793 * the correct current backlight level in most cases.
794 * ACPI video backlight still works w/ buggy _BQC.
795 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
796 */
797 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
798 device->cap._BQC = device->cap._BCQ = 0;
799 }
800 }
801
802 *level = device->brightness->curr;
803 return 0;
804 }
805
806 static int
807 acpi_video_device_EDID(struct acpi_video_device *device,
808 union acpi_object **edid, ssize_t length)
809 {
810 int status;
811 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
812 union acpi_object *obj;
813 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
814 struct acpi_object_list args = { 1, &arg0 };
815
816
817 *edid = NULL;
818
819 if (!device)
820 return -ENODEV;
821 if (length == 128)
822 arg0.integer.value = 1;
823 else if (length == 256)
824 arg0.integer.value = 2;
825 else
826 return -EINVAL;
827
828 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
829 if (ACPI_FAILURE(status))
830 return -ENODEV;
831
832 obj = buffer.pointer;
833
834 if (obj && obj->type == ACPI_TYPE_BUFFER)
835 *edid = obj;
836 else {
837 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
838 status = -EFAULT;
839 kfree(obj);
840 }
841
842 return status;
843 }
844
845 /* bus */
846
847 /*
848 * Arg:
849 * video : video bus device pointer
850 * bios_flag :
851 * 0. The system BIOS should NOT automatically switch(toggle)
852 * the active display output.
853 * 1. The system BIOS should automatically switch (toggle) the
854 * active display output. No switch event.
855 * 2. The _DGS value should be locked.
856 * 3. The system BIOS should not automatically switch (toggle) the
857 * active display output, but instead generate the display switch
858 * event notify code.
859 * lcd_flag :
860 * 0. The system BIOS should automatically control the brightness level
861 * of the LCD when the power changes from AC to DC
862 * 1. The system BIOS should NOT automatically control the brightness
863 * level of the LCD when the power changes from AC to DC.
864 * Return Value:
865 * -EINVAL wrong arg.
866 */
867
868 static int
869 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
870 {
871 acpi_status status;
872
873 if (!video->cap._DOS)
874 return 0;
875
876 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
877 return -EINVAL;
878 video->dos_setting = (lcd_flag << 2) | bios_flag;
879 status = acpi_execute_simple_method(video->device->handle, "_DOS",
880 (lcd_flag << 2) | bios_flag);
881 if (ACPI_FAILURE(status))
882 return -EIO;
883
884 return 0;
885 }
886
887 /*
888 * Simple comparison function used to sort backlight levels.
889 */
890
891 static int
892 acpi_video_cmp_level(const void *a, const void *b)
893 {
894 return *(int *)a - *(int *)b;
895 }
896
897 /*
898 * Decides if _BQC/_BCQ for this system is usable
899 *
900 * We do this by changing the level first and then read out the current
901 * brightness level, if the value does not match, find out if it is using
902 * index. If not, clear the _BQC/_BCQ capability.
903 */
904 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
905 int max_level, int current_level)
906 {
907 struct acpi_video_device_brightness *br = device->brightness;
908 int result;
909 unsigned long long level;
910 int test_level;
911
912 /* don't mess with existing known broken systems */
913 if (bqc_offset_aml_bug_workaround)
914 return 0;
915
916 /*
917 * Some systems always report current brightness level as maximum
918 * through _BQC, we need to test another value for them.
919 */
920 test_level = current_level == max_level ? br->levels[3] : max_level;
921
922 result = acpi_video_device_lcd_set_level(device, test_level);
923 if (result)
924 return result;
925
926 result = acpi_video_device_lcd_get_level_current(device, &level, true);
927 if (result)
928 return result;
929
930 if (level != test_level) {
931 /* buggy _BQC found, need to find out if it uses index */
932 if (level < br->count) {
933 if (br->flags._BCL_reversed)
934 level = br->count - 3 - level;
935 if (br->levels[level + 2] == test_level)
936 br->flags._BQC_use_index = 1;
937 }
938
939 if (!br->flags._BQC_use_index)
940 device->cap._BQC = device->cap._BCQ = 0;
941 }
942
943 return 0;
944 }
945
946
947 /*
948 * Arg:
949 * device : video output device (LCD, CRT, ..)
950 *
951 * Return Value:
952 * Maximum brightness level
953 *
954 * Allocate and initialize device->brightness.
955 */
956
957 static int
958 acpi_video_init_brightness(struct acpi_video_device *device)
959 {
960 union acpi_object *obj = NULL;
961 int i, max_level = 0, count = 0, level_ac_battery = 0;
962 unsigned long long level, level_old;
963 union acpi_object *o;
964 struct acpi_video_device_brightness *br = NULL;
965 int result = -EINVAL;
966 u32 value;
967
968 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
969 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
970 "LCD brightness level\n"));
971 goto out;
972 }
973
974 if (obj->package.count < 2)
975 goto out;
976
977 br = kzalloc(sizeof(*br), GFP_KERNEL);
978 if (!br) {
979 printk(KERN_ERR "can't allocate memory\n");
980 result = -ENOMEM;
981 goto out;
982 }
983
984 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
985 GFP_KERNEL);
986 if (!br->levels) {
987 result = -ENOMEM;
988 goto out_free;
989 }
990
991 for (i = 0; i < obj->package.count; i++) {
992 o = (union acpi_object *)&obj->package.elements[i];
993 if (o->type != ACPI_TYPE_INTEGER) {
994 printk(KERN_ERR PREFIX "Invalid data\n");
995 continue;
996 }
997 value = (u32) o->integer.value;
998 /* Skip duplicate entries */
999 if (count > 2 && br->levels[count - 1] == value)
1000 continue;
1001
1002 br->levels[count] = value;
1003
1004 if (br->levels[count] > max_level)
1005 max_level = br->levels[count];
1006 count++;
1007 }
1008
1009 /*
1010 * some buggy BIOS don't export the levels
1011 * when machine is on AC/Battery in _BCL package.
1012 * In this case, the first two elements in _BCL packages
1013 * are also supported brightness levels that OS should take care of.
1014 */
1015 for (i = 2; i < count; i++) {
1016 if (br->levels[i] == br->levels[0])
1017 level_ac_battery++;
1018 if (br->levels[i] == br->levels[1])
1019 level_ac_battery++;
1020 }
1021
1022 if (level_ac_battery < 2) {
1023 level_ac_battery = 2 - level_ac_battery;
1024 br->flags._BCL_no_ac_battery_levels = 1;
1025 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
1026 br->levels[i] = br->levels[i - level_ac_battery];
1027 count += level_ac_battery;
1028 } else if (level_ac_battery > 2)
1029 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
1030
1031 /* Check if the _BCL package is in a reversed order */
1032 if (max_level == br->levels[2]) {
1033 br->flags._BCL_reversed = 1;
1034 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
1035 acpi_video_cmp_level, NULL);
1036 } else if (max_level != br->levels[count - 1])
1037 ACPI_ERROR((AE_INFO,
1038 "Found unordered _BCL package"));
1039
1040 br->count = count;
1041 device->brightness = br;
1042
1043 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
1044 br->curr = level = max_level;
1045
1046 if (!device->cap._BQC)
1047 goto set_level;
1048
1049 result = acpi_video_device_lcd_get_level_current(device,
1050 &level_old, true);
1051 if (result)
1052 goto out_free_levels;
1053
1054 result = acpi_video_bqc_quirk(device, max_level, level_old);
1055 if (result)
1056 goto out_free_levels;
1057 /*
1058 * cap._BQC may get cleared due to _BQC is found to be broken
1059 * in acpi_video_bqc_quirk, so check again here.
1060 */
1061 if (!device->cap._BQC)
1062 goto set_level;
1063
1064 level = acpi_video_bqc_value_to_level(device, level_old);
1065 /*
1066 * On some buggy laptops, _BQC returns an uninitialized
1067 * value when invoked for the first time, i.e.
1068 * level_old is invalid (no matter whether it's a level
1069 * or an index). Set the backlight to max_level in this case.
1070 */
1071 for (i = 2; i < br->count; i++)
1072 if (level == br->levels[i])
1073 break;
1074 if (i == br->count || !level)
1075 level = max_level;
1076
1077 set_level:
1078 result = acpi_video_device_lcd_set_level(device, level);
1079 if (result)
1080 goto out_free_levels;
1081
1082 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1083 "found %d brightness levels\n", count - 2));
1084 kfree(obj);
1085 return result;
1086
1087 out_free_levels:
1088 kfree(br->levels);
1089 out_free:
1090 kfree(br);
1091 out:
1092 device->brightness = NULL;
1093 kfree(obj);
1094 return result;
1095 }
1096
1097 /*
1098 * Arg:
1099 * device : video output device (LCD, CRT, ..)
1100 *
1101 * Return Value:
1102 * None
1103 *
1104 * Find out all required AML methods defined under the output
1105 * device.
1106 */
1107
1108 static void acpi_video_device_find_cap(struct acpi_video_device *device)
1109 {
1110 if (acpi_has_method(device->dev->handle, "_ADR"))
1111 device->cap._ADR = 1;
1112 if (acpi_has_method(device->dev->handle, "_BCL"))
1113 device->cap._BCL = 1;
1114 if (acpi_has_method(device->dev->handle, "_BCM"))
1115 device->cap._BCM = 1;
1116 if (acpi_has_method(device->dev->handle, "_BQC")) {
1117 device->cap._BQC = 1;
1118 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
1119 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
1120 device->cap._BCQ = 1;
1121 }
1122
1123 if (acpi_has_method(device->dev->handle, "_DDC"))
1124 device->cap._DDC = 1;
1125 }
1126
1127 /*
1128 * Arg:
1129 * device : video output device (VGA)
1130 *
1131 * Return Value:
1132 * None
1133 *
1134 * Find out all required AML methods defined under the video bus device.
1135 */
1136
1137 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1138 {
1139 if (acpi_has_method(video->device->handle, "_DOS"))
1140 video->cap._DOS = 1;
1141 if (acpi_has_method(video->device->handle, "_DOD"))
1142 video->cap._DOD = 1;
1143 if (acpi_has_method(video->device->handle, "_ROM"))
1144 video->cap._ROM = 1;
1145 if (acpi_has_method(video->device->handle, "_GPD"))
1146 video->cap._GPD = 1;
1147 if (acpi_has_method(video->device->handle, "_SPD"))
1148 video->cap._SPD = 1;
1149 if (acpi_has_method(video->device->handle, "_VPO"))
1150 video->cap._VPO = 1;
1151 }
1152
1153 /*
1154 * Check whether the video bus device has required AML method to
1155 * support the desired features
1156 */
1157
1158 static int acpi_video_bus_check(struct acpi_video_bus *video)
1159 {
1160 acpi_status status = -ENOENT;
1161 struct pci_dev *dev;
1162
1163 if (!video)
1164 return -EINVAL;
1165
1166 dev = acpi_get_pci_dev(video->device->handle);
1167 if (!dev)
1168 return -ENODEV;
1169 pci_dev_put(dev);
1170
1171 /*
1172 * Since there is no HID, CID and so on for VGA driver, we have
1173 * to check well known required nodes.
1174 */
1175
1176 /* Does this device support video switching? */
1177 if (video->cap._DOS || video->cap._DOD) {
1178 if (!video->cap._DOS) {
1179 printk(KERN_WARNING FW_BUG
1180 "ACPI(%s) defines _DOD but not _DOS\n",
1181 acpi_device_bid(video->device));
1182 }
1183 video->flags.multihead = 1;
1184 status = 0;
1185 }
1186
1187 /* Does this device support retrieving a video ROM? */
1188 if (video->cap._ROM) {
1189 video->flags.rom = 1;
1190 status = 0;
1191 }
1192
1193 /* Does this device support configuring which video device to POST? */
1194 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1195 video->flags.post = 1;
1196 status = 0;
1197 }
1198
1199 return status;
1200 }
1201
1202 /*
1203 * --------------------------------------------------------------------------
1204 * Driver Interface
1205 * --------------------------------------------------------------------------
1206 */
1207
1208 /* device interface */
1209 static struct acpi_video_device_attrib *
1210 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1211 {
1212 struct acpi_video_enumerated_device *ids;
1213 int i;
1214
1215 for (i = 0; i < video->attached_count; i++) {
1216 ids = &video->attached_array[i];
1217 if ((ids->value.int_val & 0xffff) == device_id)
1218 return &ids->value.attrib;
1219 }
1220
1221 return NULL;
1222 }
1223
1224 static int
1225 acpi_video_get_device_type(struct acpi_video_bus *video,
1226 unsigned long device_id)
1227 {
1228 struct acpi_video_enumerated_device *ids;
1229 int i;
1230
1231 for (i = 0; i < video->attached_count; i++) {
1232 ids = &video->attached_array[i];
1233 if ((ids->value.int_val & 0xffff) == device_id)
1234 return ids->value.int_val;
1235 }
1236
1237 return 0;
1238 }
1239
1240 static int
1241 acpi_video_bus_get_one_device(struct acpi_device *device,
1242 struct acpi_video_bus *video)
1243 {
1244 unsigned long long device_id;
1245 int status, device_type;
1246 struct acpi_video_device *data;
1247 struct acpi_video_device_attrib *attribute;
1248
1249 status =
1250 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1251 /* Some device omits _ADR, we skip them instead of fail */
1252 if (ACPI_FAILURE(status))
1253 return 0;
1254
1255 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1256 if (!data)
1257 return -ENOMEM;
1258
1259 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1260 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1261 device->driver_data = data;
1262
1263 data->device_id = device_id;
1264 data->video = video;
1265 data->dev = device;
1266 INIT_DELAYED_WORK(&data->switch_brightness_work,
1267 acpi_video_switch_brightness);
1268
1269 attribute = acpi_video_get_device_attr(video, device_id);
1270
1271 if (attribute && attribute->device_id_scheme) {
1272 switch (attribute->display_type) {
1273 case ACPI_VIDEO_DISPLAY_CRT:
1274 data->flags.crt = 1;
1275 break;
1276 case ACPI_VIDEO_DISPLAY_TV:
1277 data->flags.tvout = 1;
1278 break;
1279 case ACPI_VIDEO_DISPLAY_DVI:
1280 data->flags.dvi = 1;
1281 break;
1282 case ACPI_VIDEO_DISPLAY_LCD:
1283 data->flags.lcd = 1;
1284 break;
1285 default:
1286 data->flags.unknown = 1;
1287 break;
1288 }
1289 if (attribute->bios_can_detect)
1290 data->flags.bios = 1;
1291 } else {
1292 /* Check for legacy IDs */
1293 device_type = acpi_video_get_device_type(video, device_id);
1294 /* Ignore bits 16 and 18-20 */
1295 switch (device_type & 0xffe2ffff) {
1296 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1297 data->flags.crt = 1;
1298 break;
1299 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1300 data->flags.lcd = 1;
1301 break;
1302 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1303 data->flags.tvout = 1;
1304 break;
1305 default:
1306 data->flags.unknown = 1;
1307 }
1308 }
1309
1310 acpi_video_device_bind(video, data);
1311 acpi_video_device_find_cap(data);
1312
1313 mutex_lock(&video->device_list_lock);
1314 list_add_tail(&data->entry, &video->video_device_list);
1315 mutex_unlock(&video->device_list_lock);
1316
1317 return status;
1318 }
1319
1320 /*
1321 * Arg:
1322 * video : video bus device
1323 *
1324 * Return:
1325 * none
1326 *
1327 * Enumerate the video device list of the video bus,
1328 * bind the ids with the corresponding video devices
1329 * under the video bus.
1330 */
1331
1332 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1333 {
1334 struct acpi_video_device *dev;
1335
1336 mutex_lock(&video->device_list_lock);
1337
1338 list_for_each_entry(dev, &video->video_device_list, entry)
1339 acpi_video_device_bind(video, dev);
1340
1341 mutex_unlock(&video->device_list_lock);
1342 }
1343
1344 /*
1345 * Arg:
1346 * video : video bus device
1347 * device : video output device under the video
1348 * bus
1349 *
1350 * Return:
1351 * none
1352 *
1353 * Bind the ids with the corresponding video devices
1354 * under the video bus.
1355 */
1356
1357 static void
1358 acpi_video_device_bind(struct acpi_video_bus *video,
1359 struct acpi_video_device *device)
1360 {
1361 struct acpi_video_enumerated_device *ids;
1362 int i;
1363
1364 for (i = 0; i < video->attached_count; i++) {
1365 ids = &video->attached_array[i];
1366 if (device->device_id == (ids->value.int_val & 0xffff)) {
1367 ids->bind_info = device;
1368 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1369 }
1370 }
1371 }
1372
1373 /*
1374 * Arg:
1375 * video : video bus device
1376 *
1377 * Return:
1378 * < 0 : error
1379 *
1380 * Call _DOD to enumerate all devices attached to display adapter
1381 *
1382 */
1383
1384 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1385 {
1386 int status;
1387 int count;
1388 int i;
1389 struct acpi_video_enumerated_device *active_list;
1390 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1391 union acpi_object *dod = NULL;
1392 union acpi_object *obj;
1393
1394 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1395 if (!ACPI_SUCCESS(status)) {
1396 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1397 return status;
1398 }
1399
1400 dod = buffer.pointer;
1401 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1402 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1403 status = -EFAULT;
1404 goto out;
1405 }
1406
1407 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1408 dod->package.count));
1409
1410 active_list = kcalloc(1 + dod->package.count,
1411 sizeof(struct acpi_video_enumerated_device),
1412 GFP_KERNEL);
1413 if (!active_list) {
1414 status = -ENOMEM;
1415 goto out;
1416 }
1417
1418 count = 0;
1419 for (i = 0; i < dod->package.count; i++) {
1420 obj = &dod->package.elements[i];
1421
1422 if (obj->type != ACPI_TYPE_INTEGER) {
1423 printk(KERN_ERR PREFIX
1424 "Invalid _DOD data in element %d\n", i);
1425 continue;
1426 }
1427
1428 active_list[count].value.int_val = obj->integer.value;
1429 active_list[count].bind_info = NULL;
1430 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1431 (int)obj->integer.value));
1432 count++;
1433 }
1434
1435 kfree(video->attached_array);
1436
1437 video->attached_array = active_list;
1438 video->attached_count = count;
1439
1440 out:
1441 kfree(buffer.pointer);
1442 return status;
1443 }
1444
1445 static int
1446 acpi_video_get_next_level(struct acpi_video_device *device,
1447 u32 level_current, u32 event)
1448 {
1449 int min, max, min_above, max_below, i, l, delta = 255;
1450 max = max_below = 0;
1451 min = min_above = 255;
1452 /* Find closest level to level_current */
1453 for (i = 2; i < device->brightness->count; i++) {
1454 l = device->brightness->levels[i];
1455 if (abs(l - level_current) < abs(delta)) {
1456 delta = l - level_current;
1457 if (!delta)
1458 break;
1459 }
1460 }
1461 /* Ajust level_current to closest available level */
1462 level_current += delta;
1463 for (i = 2; i < device->brightness->count; i++) {
1464 l = device->brightness->levels[i];
1465 if (l < min)
1466 min = l;
1467 if (l > max)
1468 max = l;
1469 if (l < min_above && l > level_current)
1470 min_above = l;
1471 if (l > max_below && l < level_current)
1472 max_below = l;
1473 }
1474
1475 switch (event) {
1476 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1477 return (level_current < max) ? min_above : min;
1478 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1479 return (level_current < max) ? min_above : max;
1480 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1481 return (level_current > min) ? max_below : min;
1482 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1483 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1484 return 0;
1485 default:
1486 return level_current;
1487 }
1488 }
1489
1490 static void
1491 acpi_video_switch_brightness(struct work_struct *work)
1492 {
1493 struct acpi_video_device *device = container_of(to_delayed_work(work),
1494 struct acpi_video_device, switch_brightness_work);
1495 unsigned long long level_current, level_next;
1496 int event = device->switch_brightness_event;
1497 int result = -EINVAL;
1498
1499 /* no warning message if acpi_backlight=vendor or a quirk is used */
1500 if (!acpi_video_verify_backlight_support())
1501 return;
1502
1503 if (!device->brightness)
1504 goto out;
1505
1506 result = acpi_video_device_lcd_get_level_current(device,
1507 &level_current,
1508 false);
1509 if (result)
1510 goto out;
1511
1512 level_next = acpi_video_get_next_level(device, level_current, event);
1513
1514 result = acpi_video_device_lcd_set_level(device, level_next);
1515
1516 if (!result)
1517 backlight_force_update(device->backlight,
1518 BACKLIGHT_UPDATE_HOTKEY);
1519
1520 out:
1521 if (result)
1522 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1523 }
1524
1525 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1526 void **edid)
1527 {
1528 struct acpi_video_bus *video;
1529 struct acpi_video_device *video_device;
1530 union acpi_object *buffer = NULL;
1531 acpi_status status;
1532 int i, length;
1533
1534 if (!device || !acpi_driver_data(device))
1535 return -EINVAL;
1536
1537 video = acpi_driver_data(device);
1538
1539 for (i = 0; i < video->attached_count; i++) {
1540 video_device = video->attached_array[i].bind_info;
1541 length = 256;
1542
1543 if (!video_device)
1544 continue;
1545
1546 if (!video_device->cap._DDC)
1547 continue;
1548
1549 if (type) {
1550 switch (type) {
1551 case ACPI_VIDEO_DISPLAY_CRT:
1552 if (!video_device->flags.crt)
1553 continue;
1554 break;
1555 case ACPI_VIDEO_DISPLAY_TV:
1556 if (!video_device->flags.tvout)
1557 continue;
1558 break;
1559 case ACPI_VIDEO_DISPLAY_DVI:
1560 if (!video_device->flags.dvi)
1561 continue;
1562 break;
1563 case ACPI_VIDEO_DISPLAY_LCD:
1564 if (!video_device->flags.lcd)
1565 continue;
1566 break;
1567 }
1568 } else if (video_device->device_id != device_id) {
1569 continue;
1570 }
1571
1572 status = acpi_video_device_EDID(video_device, &buffer, length);
1573
1574 if (ACPI_FAILURE(status) || !buffer ||
1575 buffer->type != ACPI_TYPE_BUFFER) {
1576 length = 128;
1577 status = acpi_video_device_EDID(video_device, &buffer,
1578 length);
1579 if (ACPI_FAILURE(status) || !buffer ||
1580 buffer->type != ACPI_TYPE_BUFFER) {
1581 continue;
1582 }
1583 }
1584
1585 *edid = buffer->buffer.pointer;
1586 return length;
1587 }
1588
1589 return -ENODEV;
1590 }
1591 EXPORT_SYMBOL(acpi_video_get_edid);
1592
1593 static int
1594 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1595 struct acpi_device *device)
1596 {
1597 int status = 0;
1598 struct acpi_device *dev;
1599
1600 /*
1601 * There are systems where video module known to work fine regardless
1602 * of broken _DOD and ignoring returned value here doesn't cause
1603 * any issues later.
1604 */
1605 acpi_video_device_enumerate(video);
1606
1607 list_for_each_entry(dev, &device->children, node) {
1608
1609 status = acpi_video_bus_get_one_device(dev, video);
1610 if (status) {
1611 dev_err(&dev->dev, "Can't attach device\n");
1612 break;
1613 }
1614 }
1615 return status;
1616 }
1617
1618 /* acpi_video interface */
1619
1620 /*
1621 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1622 * preform any automatic brightness change on receiving a notification.
1623 */
1624 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1625 {
1626 return acpi_video_bus_DOS(video, 0,
1627 acpi_osi_is_win8() ? 1 : 0);
1628 }
1629
1630 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1631 {
1632 return acpi_video_bus_DOS(video, 0,
1633 acpi_osi_is_win8() ? 0 : 1);
1634 }
1635
1636 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1637 {
1638 struct acpi_video_bus *video = acpi_driver_data(device);
1639 struct input_dev *input;
1640 int keycode = 0;
1641
1642 if (!video || !video->input)
1643 return;
1644
1645 input = video->input;
1646
1647 switch (event) {
1648 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1649 * most likely via hotkey. */
1650 keycode = KEY_SWITCHVIDEOMODE;
1651 break;
1652
1653 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1654 * connector. */
1655 acpi_video_device_enumerate(video);
1656 acpi_video_device_rebind(video);
1657 keycode = KEY_SWITCHVIDEOMODE;
1658 break;
1659
1660 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1661 keycode = KEY_SWITCHVIDEOMODE;
1662 break;
1663 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1664 keycode = KEY_VIDEO_NEXT;
1665 break;
1666 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1667 keycode = KEY_VIDEO_PREV;
1668 break;
1669
1670 default:
1671 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1672 "Unsupported event [0x%x]\n", event));
1673 break;
1674 }
1675
1676 if (acpi_notifier_call_chain(device, event, 0))
1677 /* Something vetoed the keypress. */
1678 keycode = 0;
1679
1680 if (keycode) {
1681 input_report_key(input, keycode, 1);
1682 input_sync(input);
1683 input_report_key(input, keycode, 0);
1684 input_sync(input);
1685 }
1686
1687 return;
1688 }
1689
1690 static void brightness_switch_event(struct acpi_video_device *video_device,
1691 u32 event)
1692 {
1693 if (!brightness_switch_enabled)
1694 return;
1695
1696 video_device->switch_brightness_event = event;
1697 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10);
1698 }
1699
1700 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1701 {
1702 struct acpi_video_device *video_device = data;
1703 struct acpi_device *device = NULL;
1704 struct acpi_video_bus *bus;
1705 struct input_dev *input;
1706 int keycode = 0;
1707
1708 if (!video_device)
1709 return;
1710
1711 device = video_device->dev;
1712 bus = video_device->video;
1713 input = bus->input;
1714
1715 switch (event) {
1716 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1717 brightness_switch_event(video_device, event);
1718 keycode = KEY_BRIGHTNESS_CYCLE;
1719 break;
1720 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1721 brightness_switch_event(video_device, event);
1722 keycode = KEY_BRIGHTNESSUP;
1723 break;
1724 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1725 brightness_switch_event(video_device, event);
1726 keycode = KEY_BRIGHTNESSDOWN;
1727 break;
1728 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1729 brightness_switch_event(video_device, event);
1730 keycode = KEY_BRIGHTNESS_ZERO;
1731 break;
1732 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1733 brightness_switch_event(video_device, event);
1734 keycode = KEY_DISPLAY_OFF;
1735 break;
1736 default:
1737 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1738 "Unsupported event [0x%x]\n", event));
1739 break;
1740 }
1741
1742 acpi_notifier_call_chain(device, event, 0);
1743
1744 if (keycode) {
1745 input_report_key(input, keycode, 1);
1746 input_sync(input);
1747 input_report_key(input, keycode, 0);
1748 input_sync(input);
1749 }
1750
1751 return;
1752 }
1753
1754 static int acpi_video_resume(struct notifier_block *nb,
1755 unsigned long val, void *ign)
1756 {
1757 struct acpi_video_bus *video;
1758 struct acpi_video_device *video_device;
1759 int i;
1760
1761 switch (val) {
1762 case PM_HIBERNATION_PREPARE:
1763 case PM_SUSPEND_PREPARE:
1764 case PM_RESTORE_PREPARE:
1765 return NOTIFY_DONE;
1766 }
1767
1768 video = container_of(nb, struct acpi_video_bus, pm_nb);
1769
1770 dev_info(&video->device->dev, "Restoring backlight state\n");
1771
1772 for (i = 0; i < video->attached_count; i++) {
1773 video_device = video->attached_array[i].bind_info;
1774 if (video_device && video_device->backlight)
1775 acpi_video_set_brightness(video_device->backlight);
1776 }
1777
1778 return NOTIFY_OK;
1779 }
1780
1781 static acpi_status
1782 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1783 void **return_value)
1784 {
1785 struct acpi_device *device = context;
1786 struct acpi_device *sibling;
1787 int result;
1788
1789 if (handle == device->handle)
1790 return AE_CTRL_TERMINATE;
1791
1792 result = acpi_bus_get_device(handle, &sibling);
1793 if (result)
1794 return AE_OK;
1795
1796 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1797 return AE_ALREADY_EXISTS;
1798
1799 return AE_OK;
1800 }
1801
1802 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1803 {
1804 struct backlight_properties props;
1805 struct pci_dev *pdev;
1806 acpi_handle acpi_parent;
1807 struct device *parent = NULL;
1808 int result;
1809 static int count;
1810 char *name;
1811
1812 result = acpi_video_init_brightness(device);
1813 if (result)
1814 return;
1815 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1816 if (!name)
1817 return;
1818 count++;
1819
1820 acpi_get_parent(device->dev->handle, &acpi_parent);
1821
1822 pdev = acpi_get_pci_dev(acpi_parent);
1823 if (pdev) {
1824 parent = &pdev->dev;
1825 pci_dev_put(pdev);
1826 }
1827
1828 memset(&props, 0, sizeof(struct backlight_properties));
1829 props.type = BACKLIGHT_FIRMWARE;
1830 props.max_brightness = device->brightness->count - 3;
1831 device->backlight = backlight_device_register(name,
1832 parent,
1833 device,
1834 &acpi_backlight_ops,
1835 &props);
1836 kfree(name);
1837 if (IS_ERR(device->backlight))
1838 return;
1839
1840 /*
1841 * Save current brightness level in case we have to restore it
1842 * before acpi_video_device_lcd_set_level() is called next time.
1843 */
1844 device->backlight->props.brightness =
1845 acpi_video_get_brightness(device->backlight);
1846
1847 device->cooling_dev = thermal_cooling_device_register("LCD",
1848 device->dev, &video_cooling_ops);
1849 if (IS_ERR(device->cooling_dev)) {
1850 /*
1851 * Set cooling_dev to NULL so we don't crash trying to free it.
1852 * Also, why the hell we are returning early and not attempt to
1853 * register video output if cooling device registration failed?
1854 * -- dtor
1855 */
1856 device->cooling_dev = NULL;
1857 return;
1858 }
1859
1860 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1861 device->cooling_dev->id);
1862 result = sysfs_create_link(&device->dev->dev.kobj,
1863 &device->cooling_dev->device.kobj,
1864 "thermal_cooling");
1865 if (result)
1866 printk(KERN_ERR PREFIX "Create sysfs link\n");
1867 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1868 &device->dev->dev.kobj, "device");
1869 if (result)
1870 printk(KERN_ERR PREFIX "Create sysfs link\n");
1871 }
1872
1873 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1874 {
1875 struct acpi_video_device *dev;
1876
1877 if (video->backlight_registered)
1878 return 0;
1879
1880 if (!acpi_video_verify_backlight_support())
1881 return 0;
1882
1883 mutex_lock(&video->device_list_lock);
1884 list_for_each_entry(dev, &video->video_device_list, entry)
1885 acpi_video_dev_register_backlight(dev);
1886 mutex_unlock(&video->device_list_lock);
1887
1888 video->backlight_registered = true;
1889
1890 video->pm_nb.notifier_call = acpi_video_resume;
1891 video->pm_nb.priority = 0;
1892 return register_pm_notifier(&video->pm_nb);
1893 }
1894
1895 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1896 {
1897 if (device->backlight) {
1898 backlight_device_unregister(device->backlight);
1899 device->backlight = NULL;
1900 }
1901 if (device->brightness) {
1902 kfree(device->brightness->levels);
1903 kfree(device->brightness);
1904 device->brightness = NULL;
1905 }
1906 if (device->cooling_dev) {
1907 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1908 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1909 thermal_cooling_device_unregister(device->cooling_dev);
1910 device->cooling_dev = NULL;
1911 }
1912 }
1913
1914 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1915 {
1916 struct acpi_video_device *dev;
1917 int error;
1918
1919 if (!video->backlight_registered)
1920 return 0;
1921
1922 error = unregister_pm_notifier(&video->pm_nb);
1923
1924 mutex_lock(&video->device_list_lock);
1925 list_for_each_entry(dev, &video->video_device_list, entry)
1926 acpi_video_dev_unregister_backlight(dev);
1927 mutex_unlock(&video->device_list_lock);
1928
1929 video->backlight_registered = false;
1930
1931 return error;
1932 }
1933
1934 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1935 {
1936 acpi_status status;
1937 struct acpi_device *adev = device->dev;
1938
1939 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1940 acpi_video_device_notify, device);
1941 if (ACPI_FAILURE(status))
1942 dev_err(&adev->dev, "Error installing notify handler\n");
1943 else
1944 device->flags.notify = 1;
1945 }
1946
1947 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1948 {
1949 struct input_dev *input;
1950 struct acpi_video_device *dev;
1951 int error;
1952
1953 video->input = input = input_allocate_device();
1954 if (!input) {
1955 error = -ENOMEM;
1956 goto out;
1957 }
1958
1959 error = acpi_video_bus_start_devices(video);
1960 if (error)
1961 goto err_free_input;
1962
1963 snprintf(video->phys, sizeof(video->phys),
1964 "%s/video/input0", acpi_device_hid(video->device));
1965
1966 input->name = acpi_device_name(video->device);
1967 input->phys = video->phys;
1968 input->id.bustype = BUS_HOST;
1969 input->id.product = 0x06;
1970 input->dev.parent = &video->device->dev;
1971 input->evbit[0] = BIT(EV_KEY);
1972 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1973 set_bit(KEY_VIDEO_NEXT, input->keybit);
1974 set_bit(KEY_VIDEO_PREV, input->keybit);
1975 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1976 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1977 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1978 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1979 set_bit(KEY_DISPLAY_OFF, input->keybit);
1980
1981 error = input_register_device(input);
1982 if (error)
1983 goto err_stop_dev;
1984
1985 mutex_lock(&video->device_list_lock);
1986 list_for_each_entry(dev, &video->video_device_list, entry)
1987 acpi_video_dev_add_notify_handler(dev);
1988 mutex_unlock(&video->device_list_lock);
1989
1990 return 0;
1991
1992 err_stop_dev:
1993 acpi_video_bus_stop_devices(video);
1994 err_free_input:
1995 input_free_device(input);
1996 video->input = NULL;
1997 out:
1998 return error;
1999 }
2000
2001 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
2002 {
2003 if (dev->flags.notify) {
2004 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
2005 acpi_video_device_notify);
2006 dev->flags.notify = 0;
2007 }
2008 }
2009
2010 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
2011 {
2012 struct acpi_video_device *dev;
2013
2014 mutex_lock(&video->device_list_lock);
2015 list_for_each_entry(dev, &video->video_device_list, entry)
2016 acpi_video_dev_remove_notify_handler(dev);
2017 mutex_unlock(&video->device_list_lock);
2018
2019 acpi_video_bus_stop_devices(video);
2020 input_unregister_device(video->input);
2021 video->input = NULL;
2022 }
2023
2024 static int acpi_video_backlight_notify(struct notifier_block *nb,
2025 unsigned long val, void *bd)
2026 {
2027 struct backlight_device *backlight = bd;
2028 struct acpi_video_bus *video;
2029
2030 /* acpi_video_verify_backlight_support only cares about raw devices */
2031 if (backlight->props.type != BACKLIGHT_RAW)
2032 return NOTIFY_DONE;
2033
2034 video = container_of(nb, struct acpi_video_bus, backlight_nb);
2035
2036 switch (val) {
2037 case BACKLIGHT_REGISTERED:
2038 if (!acpi_video_verify_backlight_support())
2039 acpi_video_bus_unregister_backlight(video);
2040 break;
2041 case BACKLIGHT_UNREGISTERED:
2042 acpi_video_bus_register_backlight(video);
2043 break;
2044 }
2045
2046 return NOTIFY_OK;
2047 }
2048
2049 static int acpi_video_bus_add_backlight_notify_handler(
2050 struct acpi_video_bus *video)
2051 {
2052 int error;
2053
2054 video->backlight_nb.notifier_call = acpi_video_backlight_notify;
2055 video->backlight_nb.priority = 0;
2056 error = backlight_register_notifier(&video->backlight_nb);
2057 if (error == 0)
2058 video->backlight_notifier_registered = true;
2059
2060 return error;
2061 }
2062
2063 static int acpi_video_bus_remove_backlight_notify_handler(
2064 struct acpi_video_bus *video)
2065 {
2066 if (!video->backlight_notifier_registered)
2067 return 0;
2068
2069 video->backlight_notifier_registered = false;
2070
2071 return backlight_unregister_notifier(&video->backlight_nb);
2072 }
2073
2074 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
2075 {
2076 struct acpi_video_device *dev, *next;
2077
2078 mutex_lock(&video->device_list_lock);
2079 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
2080 list_del(&dev->entry);
2081 kfree(dev);
2082 }
2083 mutex_unlock(&video->device_list_lock);
2084
2085 return 0;
2086 }
2087
2088 static int instance;
2089
2090 static int acpi_video_bus_add(struct acpi_device *device)
2091 {
2092 struct acpi_video_bus *video;
2093 int error;
2094 acpi_status status;
2095
2096 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
2097 device->parent->handle, 1,
2098 acpi_video_bus_match, NULL,
2099 device, NULL);
2100 if (status == AE_ALREADY_EXISTS) {
2101 printk(KERN_WARNING FW_BUG
2102 "Duplicate ACPI video bus devices for the"
2103 " same VGA controller, please try module "
2104 "parameter \"video.allow_duplicates=1\""
2105 "if the current driver doesn't work.\n");
2106 if (!allow_duplicates)
2107 return -ENODEV;
2108 }
2109
2110 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2111 if (!video)
2112 return -ENOMEM;
2113
2114 /* a hack to fix the duplicate name "VID" problem on T61 */
2115 if (!strcmp(device->pnp.bus_id, "VID")) {
2116 if (instance)
2117 device->pnp.bus_id[3] = '0' + instance;
2118 instance++;
2119 }
2120 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2121 if (!strcmp(device->pnp.bus_id, "VGA")) {
2122 if (instance)
2123 device->pnp.bus_id[3] = '0' + instance;
2124 instance++;
2125 }
2126
2127 video->device = device;
2128 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2129 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2130 device->driver_data = video;
2131
2132 acpi_video_bus_find_cap(video);
2133 error = acpi_video_bus_check(video);
2134 if (error)
2135 goto err_free_video;
2136
2137 mutex_init(&video->device_list_lock);
2138 INIT_LIST_HEAD(&video->video_device_list);
2139
2140 error = acpi_video_bus_get_devices(video, device);
2141 if (error)
2142 goto err_put_video;
2143
2144 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
2145 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2146 video->flags.multihead ? "yes" : "no",
2147 video->flags.rom ? "yes" : "no",
2148 video->flags.post ? "yes" : "no");
2149 mutex_lock(&video_list_lock);
2150 list_add_tail(&video->entry, &video_bus_head);
2151 mutex_unlock(&video_list_lock);
2152
2153 acpi_video_bus_register_backlight(video);
2154 acpi_video_bus_add_notify_handler(video);
2155 acpi_video_bus_add_backlight_notify_handler(video);
2156
2157 return 0;
2158
2159 err_put_video:
2160 acpi_video_bus_put_devices(video);
2161 kfree(video->attached_array);
2162 err_free_video:
2163 kfree(video);
2164 device->driver_data = NULL;
2165
2166 return error;
2167 }
2168
2169 static int acpi_video_bus_remove(struct acpi_device *device)
2170 {
2171 struct acpi_video_bus *video = NULL;
2172
2173
2174 if (!device || !acpi_driver_data(device))
2175 return -EINVAL;
2176
2177 video = acpi_driver_data(device);
2178
2179 acpi_video_bus_remove_backlight_notify_handler(video);
2180 acpi_video_bus_remove_notify_handler(video);
2181 acpi_video_bus_unregister_backlight(video);
2182 acpi_video_bus_put_devices(video);
2183
2184 mutex_lock(&video_list_lock);
2185 list_del(&video->entry);
2186 mutex_unlock(&video_list_lock);
2187
2188 kfree(video->attached_array);
2189 kfree(video);
2190
2191 return 0;
2192 }
2193
2194 static int __init is_i740(struct pci_dev *dev)
2195 {
2196 if (dev->device == 0x00D1)
2197 return 1;
2198 if (dev->device == 0x7000)
2199 return 1;
2200 return 0;
2201 }
2202
2203 static int __init intel_opregion_present(void)
2204 {
2205 int opregion = 0;
2206 struct pci_dev *dev = NULL;
2207 u32 address;
2208
2209 for_each_pci_dev(dev) {
2210 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2211 continue;
2212 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2213 continue;
2214 /* We don't want to poke around undefined i740 registers */
2215 if (is_i740(dev))
2216 continue;
2217 pci_read_config_dword(dev, 0xfc, &address);
2218 if (!address)
2219 continue;
2220 opregion = 1;
2221 }
2222 return opregion;
2223 }
2224
2225 int acpi_video_register(void)
2226 {
2227 int result = 0;
2228 if (register_count) {
2229 /*
2230 * if the function of acpi_video_register is already called,
2231 * don't register the acpi_vide_bus again and return no error.
2232 */
2233 return 0;
2234 }
2235
2236 mutex_init(&video_list_lock);
2237 INIT_LIST_HEAD(&video_bus_head);
2238
2239 result = acpi_bus_register_driver(&acpi_video_bus);
2240 if (result < 0)
2241 return -ENODEV;
2242
2243 /*
2244 * When the acpi_video_bus is loaded successfully, increase
2245 * the counter reference.
2246 */
2247 register_count = 1;
2248
2249 return 0;
2250 }
2251 EXPORT_SYMBOL(acpi_video_register);
2252
2253 void acpi_video_unregister(void)
2254 {
2255 if (!register_count) {
2256 /*
2257 * If the acpi video bus is already unloaded, don't
2258 * unload it again and return directly.
2259 */
2260 return;
2261 }
2262 acpi_bus_unregister_driver(&acpi_video_bus);
2263
2264 register_count = 0;
2265
2266 return;
2267 }
2268 EXPORT_SYMBOL(acpi_video_unregister);
2269
2270 void acpi_video_unregister_backlight(void)
2271 {
2272 struct acpi_video_bus *video;
2273
2274 if (!register_count)
2275 return;
2276
2277 mutex_lock(&video_list_lock);
2278 list_for_each_entry(video, &video_bus_head, entry)
2279 acpi_video_bus_unregister_backlight(video);
2280 mutex_unlock(&video_list_lock);
2281 }
2282 EXPORT_SYMBOL(acpi_video_unregister_backlight);
2283
2284 /*
2285 * This is kind of nasty. Hardware using Intel chipsets may require
2286 * the video opregion code to be run first in order to initialise
2287 * state before any ACPI video calls are made. To handle this we defer
2288 * registration of the video class until the opregion code has run.
2289 */
2290
2291 static int __init acpi_video_init(void)
2292 {
2293 dmi_check_system(video_dmi_table);
2294
2295 if (intel_opregion_present())
2296 return 0;
2297
2298 return acpi_video_register();
2299 }
2300
2301 static void __exit acpi_video_exit(void)
2302 {
2303 acpi_video_unregister();
2304
2305 return;
2306 }
2307
2308 module_init(acpi_video_init);
2309 module_exit(acpi_video_exit);
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