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Merge tag 'pm+acpi-3.17-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael...
[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 = 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 = true;
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 int __init video_disable_native_backlight(const struct dmi_system_id *d)
421 {
422 use_native_backlight_dmi = false;
423 return 0;
424 }
425
426 static struct dmi_system_id video_dmi_table[] __initdata = {
427 /*
428 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
429 */
430 {
431 .callback = video_set_bqc_offset,
432 .ident = "Acer Aspire 5720",
433 .matches = {
434 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
435 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
436 },
437 },
438 {
439 .callback = video_set_bqc_offset,
440 .ident = "Acer Aspire 5710Z",
441 .matches = {
442 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
443 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
444 },
445 },
446 {
447 .callback = video_set_bqc_offset,
448 .ident = "eMachines E510",
449 .matches = {
450 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
451 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
452 },
453 },
454 {
455 .callback = video_set_bqc_offset,
456 .ident = "Acer Aspire 5315",
457 .matches = {
458 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
459 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
460 },
461 },
462 {
463 .callback = video_set_bqc_offset,
464 .ident = "Acer Aspire 7720",
465 .matches = {
466 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
467 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
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 T430 and T430s",
481 .matches = {
482 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
483 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T430"),
484 },
485 },
486 {
487 .callback = video_set_use_native_backlight,
488 .ident = "ThinkPad T430",
489 .matches = {
490 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
491 DMI_MATCH(DMI_PRODUCT_VERSION, "2349D15"),
492 },
493 },
494 {
495 .callback = video_set_use_native_backlight,
496 .ident = "ThinkPad T431s",
497 .matches = {
498 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
499 DMI_MATCH(DMI_PRODUCT_VERSION, "20AACTO1WW"),
500 },
501 },
502 {
503 .callback = video_set_use_native_backlight,
504 .ident = "ThinkPad Edge E530",
505 .matches = {
506 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
507 DMI_MATCH(DMI_PRODUCT_VERSION, "3259A2G"),
508 },
509 },
510 {
511 .callback = video_set_use_native_backlight,
512 .ident = "ThinkPad Edge E530",
513 .matches = {
514 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
515 DMI_MATCH(DMI_PRODUCT_VERSION, "3259CTO"),
516 },
517 },
518 {
519 .callback = video_set_use_native_backlight,
520 .ident = "ThinkPad Edge E530",
521 .matches = {
522 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
523 DMI_MATCH(DMI_PRODUCT_VERSION, "3259HJG"),
524 },
525 },
526 {
527 .callback = video_set_use_native_backlight,
528 .ident = "ThinkPad W530",
529 .matches = {
530 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
531 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad W530"),
532 },
533 },
534 {
535 .callback = video_set_use_native_backlight,
536 .ident = "ThinkPad X1 Carbon",
537 .matches = {
538 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
539 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X1 Carbon"),
540 },
541 },
542 {
543 .callback = video_set_use_native_backlight,
544 .ident = "Lenovo Yoga 13",
545 .matches = {
546 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
547 DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo IdeaPad Yoga 13"),
548 },
549 },
550 {
551 .callback = video_set_use_native_backlight,
552 .ident = "Lenovo Yoga 2 11",
553 .matches = {
554 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
555 DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo Yoga 2 11"),
556 },
557 },
558 {
559 .callback = video_set_use_native_backlight,
560 .ident = "Thinkpad Helix",
561 .matches = {
562 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
563 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad Helix"),
564 },
565 },
566 {
567 .callback = video_set_use_native_backlight,
568 .ident = "Dell Inspiron 7520",
569 .matches = {
570 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
571 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7520"),
572 },
573 },
574 {
575 .callback = video_set_use_native_backlight,
576 .ident = "Acer Aspire 5733Z",
577 .matches = {
578 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
579 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5733Z"),
580 },
581 },
582 {
583 .callback = video_set_use_native_backlight,
584 .ident = "Acer Aspire 5742G",
585 .matches = {
586 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
587 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5742G"),
588 },
589 },
590 {
591 .callback = video_set_use_native_backlight,
592 .ident = "Acer Aspire V5-171",
593 .matches = {
594 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
595 DMI_MATCH(DMI_PRODUCT_NAME, "V5-171"),
596 },
597 },
598 {
599 .callback = video_set_use_native_backlight,
600 .ident = "Acer Aspire V5-431",
601 .matches = {
602 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
603 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-431"),
604 },
605 },
606 {
607 .callback = video_set_use_native_backlight,
608 .ident = "Acer Aspire V5-471G",
609 .matches = {
610 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
611 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-471G"),
612 },
613 },
614 {
615 .callback = video_set_use_native_backlight,
616 .ident = "Acer TravelMate B113",
617 .matches = {
618 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
619 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate B113"),
620 },
621 },
622 {
623 .callback = video_set_use_native_backlight,
624 .ident = "Acer Aspire V5-572G",
625 .matches = {
626 DMI_MATCH(DMI_SYS_VENDOR, "Acer Aspire"),
627 DMI_MATCH(DMI_PRODUCT_VERSION, "V5-572G/Dazzle_CX"),
628 },
629 },
630 {
631 .callback = video_set_use_native_backlight,
632 .ident = "Acer Aspire V5-573G",
633 .matches = {
634 DMI_MATCH(DMI_SYS_VENDOR, "Acer Aspire"),
635 DMI_MATCH(DMI_PRODUCT_VERSION, "V5-573G/Dazzle_HW"),
636 },
637 },
638 {
639 .callback = video_set_use_native_backlight,
640 .ident = "ASUS Zenbook Prime UX31A",
641 .matches = {
642 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
643 DMI_MATCH(DMI_PRODUCT_NAME, "UX31A"),
644 },
645 },
646 {
647 .callback = video_set_use_native_backlight,
648 .ident = "HP ProBook 4340s",
649 .matches = {
650 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
651 DMI_MATCH(DMI_PRODUCT_VERSION, "HP ProBook 4340s"),
652 },
653 },
654 {
655 .callback = video_set_use_native_backlight,
656 .ident = "HP ProBook 4540s",
657 .matches = {
658 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
659 DMI_MATCH(DMI_PRODUCT_VERSION, "HP ProBook 4540s"),
660 },
661 },
662 {
663 .callback = video_set_use_native_backlight,
664 .ident = "HP ProBook 2013 models",
665 .matches = {
666 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
667 DMI_MATCH(DMI_PRODUCT_NAME, "HP ProBook "),
668 DMI_MATCH(DMI_PRODUCT_NAME, " G1"),
669 },
670 },
671 {
672 .callback = video_set_use_native_backlight,
673 .ident = "HP EliteBook 2013 models",
674 .matches = {
675 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
676 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook "),
677 DMI_MATCH(DMI_PRODUCT_NAME, " G1"),
678 },
679 },
680 {
681 .callback = video_set_use_native_backlight,
682 .ident = "HP EliteBook 2014 models",
683 .matches = {
684 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
685 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook "),
686 DMI_MATCH(DMI_PRODUCT_NAME, " G2"),
687 },
688 },
689 {
690 .callback = video_set_use_native_backlight,
691 .ident = "HP ZBook 14",
692 .matches = {
693 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
694 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 14"),
695 },
696 },
697 {
698 .callback = video_set_use_native_backlight,
699 .ident = "HP ZBook 15",
700 .matches = {
701 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
702 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 15"),
703 },
704 },
705 {
706 .callback = video_set_use_native_backlight,
707 .ident = "HP ZBook 17",
708 .matches = {
709 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
710 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 17"),
711 },
712 },
713 {
714 .callback = video_set_use_native_backlight,
715 .ident = "HP EliteBook 8470p",
716 .matches = {
717 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
718 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8470p"),
719 },
720 },
721 {
722 .callback = video_set_use_native_backlight,
723 .ident = "HP EliteBook 8780w",
724 .matches = {
725 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
726 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8780w"),
727 },
728 },
729
730 /*
731 * These models have a working acpi_video backlight control, and using
732 * native backlight causes a regression where backlight does not work
733 * when userspace is not handling brightness key events. Disable
734 * native_backlight on these to fix this:
735 * https://bugzilla.kernel.org/show_bug.cgi?id=81691
736 */
737 {
738 .callback = video_disable_native_backlight,
739 .ident = "ThinkPad T420",
740 .matches = {
741 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
742 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
743 },
744 },
745 {
746 .callback = video_disable_native_backlight,
747 .ident = "ThinkPad T520",
748 .matches = {
749 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
750 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
751 },
752 },
753 {
754 .callback = video_disable_native_backlight,
755 .ident = "ThinkPad X201s",
756 .matches = {
757 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
758 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
759 },
760 },
761
762 /* The native backlight controls do not work on some older machines */
763 {
764 /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
765 .callback = video_disable_native_backlight,
766 .ident = "HP ENVY 15 Notebook",
767 .matches = {
768 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
769 DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
770 },
771 },
772 {}
773 };
774
775 static unsigned long long
776 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
777 unsigned long long bqc_value)
778 {
779 unsigned long long level;
780
781 if (device->brightness->flags._BQC_use_index) {
782 /*
783 * _BQC returns an index that doesn't account for
784 * the first 2 items with special meaning, so we need
785 * to compensate for that by offsetting ourselves
786 */
787 if (device->brightness->flags._BCL_reversed)
788 bqc_value = device->brightness->count - 3 - bqc_value;
789
790 level = device->brightness->levels[bqc_value + 2];
791 } else {
792 level = bqc_value;
793 }
794
795 level += bqc_offset_aml_bug_workaround;
796
797 return level;
798 }
799
800 static int
801 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
802 unsigned long long *level, bool raw)
803 {
804 acpi_status status = AE_OK;
805 int i;
806
807 if (device->cap._BQC || device->cap._BCQ) {
808 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
809
810 status = acpi_evaluate_integer(device->dev->handle, buf,
811 NULL, level);
812 if (ACPI_SUCCESS(status)) {
813 if (raw) {
814 /*
815 * Caller has indicated he wants the raw
816 * value returned by _BQC, so don't furtherly
817 * mess with the value.
818 */
819 return 0;
820 }
821
822 *level = acpi_video_bqc_value_to_level(device, *level);
823
824 for (i = 2; i < device->brightness->count; i++)
825 if (device->brightness->levels[i] == *level) {
826 device->brightness->curr = *level;
827 return 0;
828 }
829 /*
830 * BQC returned an invalid level.
831 * Stop using it.
832 */
833 ACPI_WARNING((AE_INFO,
834 "%s returned an invalid level",
835 buf));
836 device->cap._BQC = device->cap._BCQ = 0;
837 } else {
838 /*
839 * Fixme:
840 * should we return an error or ignore this failure?
841 * dev->brightness->curr is a cached value which stores
842 * the correct current backlight level in most cases.
843 * ACPI video backlight still works w/ buggy _BQC.
844 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
845 */
846 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
847 device->cap._BQC = device->cap._BCQ = 0;
848 }
849 }
850
851 *level = device->brightness->curr;
852 return 0;
853 }
854
855 static int
856 acpi_video_device_EDID(struct acpi_video_device *device,
857 union acpi_object **edid, ssize_t length)
858 {
859 int status;
860 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
861 union acpi_object *obj;
862 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
863 struct acpi_object_list args = { 1, &arg0 };
864
865
866 *edid = NULL;
867
868 if (!device)
869 return -ENODEV;
870 if (length == 128)
871 arg0.integer.value = 1;
872 else if (length == 256)
873 arg0.integer.value = 2;
874 else
875 return -EINVAL;
876
877 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
878 if (ACPI_FAILURE(status))
879 return -ENODEV;
880
881 obj = buffer.pointer;
882
883 if (obj && obj->type == ACPI_TYPE_BUFFER)
884 *edid = obj;
885 else {
886 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
887 status = -EFAULT;
888 kfree(obj);
889 }
890
891 return status;
892 }
893
894 /* bus */
895
896 /*
897 * Arg:
898 * video : video bus device pointer
899 * bios_flag :
900 * 0. The system BIOS should NOT automatically switch(toggle)
901 * the active display output.
902 * 1. The system BIOS should automatically switch (toggle) the
903 * active display output. No switch event.
904 * 2. The _DGS value should be locked.
905 * 3. The system BIOS should not automatically switch (toggle) the
906 * active display output, but instead generate the display switch
907 * event notify code.
908 * lcd_flag :
909 * 0. The system BIOS should automatically control the brightness level
910 * of the LCD when the power changes from AC to DC
911 * 1. The system BIOS should NOT automatically control the brightness
912 * level of the LCD when the power changes from AC to DC.
913 * Return Value:
914 * -EINVAL wrong arg.
915 */
916
917 static int
918 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
919 {
920 acpi_status status;
921
922 if (!video->cap._DOS)
923 return 0;
924
925 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
926 return -EINVAL;
927 video->dos_setting = (lcd_flag << 2) | bios_flag;
928 status = acpi_execute_simple_method(video->device->handle, "_DOS",
929 (lcd_flag << 2) | bios_flag);
930 if (ACPI_FAILURE(status))
931 return -EIO;
932
933 return 0;
934 }
935
936 /*
937 * Simple comparison function used to sort backlight levels.
938 */
939
940 static int
941 acpi_video_cmp_level(const void *a, const void *b)
942 {
943 return *(int *)a - *(int *)b;
944 }
945
946 /*
947 * Decides if _BQC/_BCQ for this system is usable
948 *
949 * We do this by changing the level first and then read out the current
950 * brightness level, if the value does not match, find out if it is using
951 * index. If not, clear the _BQC/_BCQ capability.
952 */
953 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
954 int max_level, int current_level)
955 {
956 struct acpi_video_device_brightness *br = device->brightness;
957 int result;
958 unsigned long long level;
959 int test_level;
960
961 /* don't mess with existing known broken systems */
962 if (bqc_offset_aml_bug_workaround)
963 return 0;
964
965 /*
966 * Some systems always report current brightness level as maximum
967 * through _BQC, we need to test another value for them.
968 */
969 test_level = current_level == max_level ? br->levels[3] : max_level;
970
971 result = acpi_video_device_lcd_set_level(device, test_level);
972 if (result)
973 return result;
974
975 result = acpi_video_device_lcd_get_level_current(device, &level, true);
976 if (result)
977 return result;
978
979 if (level != test_level) {
980 /* buggy _BQC found, need to find out if it uses index */
981 if (level < br->count) {
982 if (br->flags._BCL_reversed)
983 level = br->count - 3 - level;
984 if (br->levels[level + 2] == test_level)
985 br->flags._BQC_use_index = 1;
986 }
987
988 if (!br->flags._BQC_use_index)
989 device->cap._BQC = device->cap._BCQ = 0;
990 }
991
992 return 0;
993 }
994
995
996 /*
997 * Arg:
998 * device : video output device (LCD, CRT, ..)
999 *
1000 * Return Value:
1001 * Maximum brightness level
1002 *
1003 * Allocate and initialize device->brightness.
1004 */
1005
1006 static int
1007 acpi_video_init_brightness(struct acpi_video_device *device)
1008 {
1009 union acpi_object *obj = NULL;
1010 int i, max_level = 0, count = 0, level_ac_battery = 0;
1011 unsigned long long level, level_old;
1012 union acpi_object *o;
1013 struct acpi_video_device_brightness *br = NULL;
1014 int result = -EINVAL;
1015 u32 value;
1016
1017 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
1018 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
1019 "LCD brightness level\n"));
1020 goto out;
1021 }
1022
1023 if (obj->package.count < 2)
1024 goto out;
1025
1026 br = kzalloc(sizeof(*br), GFP_KERNEL);
1027 if (!br) {
1028 printk(KERN_ERR "can't allocate memory\n");
1029 result = -ENOMEM;
1030 goto out;
1031 }
1032
1033 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
1034 GFP_KERNEL);
1035 if (!br->levels) {
1036 result = -ENOMEM;
1037 goto out_free;
1038 }
1039
1040 for (i = 0; i < obj->package.count; i++) {
1041 o = (union acpi_object *)&obj->package.elements[i];
1042 if (o->type != ACPI_TYPE_INTEGER) {
1043 printk(KERN_ERR PREFIX "Invalid data\n");
1044 continue;
1045 }
1046 value = (u32) o->integer.value;
1047 /* Skip duplicate entries */
1048 if (count > 2 && br->levels[count - 1] == value)
1049 continue;
1050
1051 br->levels[count] = value;
1052
1053 if (br->levels[count] > max_level)
1054 max_level = br->levels[count];
1055 count++;
1056 }
1057
1058 /*
1059 * some buggy BIOS don't export the levels
1060 * when machine is on AC/Battery in _BCL package.
1061 * In this case, the first two elements in _BCL packages
1062 * are also supported brightness levels that OS should take care of.
1063 */
1064 for (i = 2; i < count; i++) {
1065 if (br->levels[i] == br->levels[0])
1066 level_ac_battery++;
1067 if (br->levels[i] == br->levels[1])
1068 level_ac_battery++;
1069 }
1070
1071 if (level_ac_battery < 2) {
1072 level_ac_battery = 2 - level_ac_battery;
1073 br->flags._BCL_no_ac_battery_levels = 1;
1074 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
1075 br->levels[i] = br->levels[i - level_ac_battery];
1076 count += level_ac_battery;
1077 } else if (level_ac_battery > 2)
1078 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
1079
1080 /* Check if the _BCL package is in a reversed order */
1081 if (max_level == br->levels[2]) {
1082 br->flags._BCL_reversed = 1;
1083 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
1084 acpi_video_cmp_level, NULL);
1085 } else if (max_level != br->levels[count - 1])
1086 ACPI_ERROR((AE_INFO,
1087 "Found unordered _BCL package"));
1088
1089 br->count = count;
1090 device->brightness = br;
1091
1092 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
1093 br->curr = level = max_level;
1094
1095 if (!device->cap._BQC)
1096 goto set_level;
1097
1098 result = acpi_video_device_lcd_get_level_current(device,
1099 &level_old, true);
1100 if (result)
1101 goto out_free_levels;
1102
1103 result = acpi_video_bqc_quirk(device, max_level, level_old);
1104 if (result)
1105 goto out_free_levels;
1106 /*
1107 * cap._BQC may get cleared due to _BQC is found to be broken
1108 * in acpi_video_bqc_quirk, so check again here.
1109 */
1110 if (!device->cap._BQC)
1111 goto set_level;
1112
1113 level = acpi_video_bqc_value_to_level(device, level_old);
1114 /*
1115 * On some buggy laptops, _BQC returns an uninitialized
1116 * value when invoked for the first time, i.e.
1117 * level_old is invalid (no matter whether it's a level
1118 * or an index). Set the backlight to max_level in this case.
1119 */
1120 for (i = 2; i < br->count; i++)
1121 if (level == br->levels[i])
1122 break;
1123 if (i == br->count || !level)
1124 level = max_level;
1125
1126 set_level:
1127 result = acpi_video_device_lcd_set_level(device, level);
1128 if (result)
1129 goto out_free_levels;
1130
1131 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1132 "found %d brightness levels\n", count - 2));
1133 kfree(obj);
1134 return result;
1135
1136 out_free_levels:
1137 kfree(br->levels);
1138 out_free:
1139 kfree(br);
1140 out:
1141 device->brightness = NULL;
1142 kfree(obj);
1143 return result;
1144 }
1145
1146 /*
1147 * Arg:
1148 * device : video output device (LCD, CRT, ..)
1149 *
1150 * Return Value:
1151 * None
1152 *
1153 * Find out all required AML methods defined under the output
1154 * device.
1155 */
1156
1157 static void acpi_video_device_find_cap(struct acpi_video_device *device)
1158 {
1159 if (acpi_has_method(device->dev->handle, "_ADR"))
1160 device->cap._ADR = 1;
1161 if (acpi_has_method(device->dev->handle, "_BCL"))
1162 device->cap._BCL = 1;
1163 if (acpi_has_method(device->dev->handle, "_BCM"))
1164 device->cap._BCM = 1;
1165 if (acpi_has_method(device->dev->handle, "_BQC")) {
1166 device->cap._BQC = 1;
1167 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
1168 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
1169 device->cap._BCQ = 1;
1170 }
1171
1172 if (acpi_has_method(device->dev->handle, "_DDC"))
1173 device->cap._DDC = 1;
1174 }
1175
1176 /*
1177 * Arg:
1178 * device : video output device (VGA)
1179 *
1180 * Return Value:
1181 * None
1182 *
1183 * Find out all required AML methods defined under the video bus device.
1184 */
1185
1186 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1187 {
1188 if (acpi_has_method(video->device->handle, "_DOS"))
1189 video->cap._DOS = 1;
1190 if (acpi_has_method(video->device->handle, "_DOD"))
1191 video->cap._DOD = 1;
1192 if (acpi_has_method(video->device->handle, "_ROM"))
1193 video->cap._ROM = 1;
1194 if (acpi_has_method(video->device->handle, "_GPD"))
1195 video->cap._GPD = 1;
1196 if (acpi_has_method(video->device->handle, "_SPD"))
1197 video->cap._SPD = 1;
1198 if (acpi_has_method(video->device->handle, "_VPO"))
1199 video->cap._VPO = 1;
1200 }
1201
1202 /*
1203 * Check whether the video bus device has required AML method to
1204 * support the desired features
1205 */
1206
1207 static int acpi_video_bus_check(struct acpi_video_bus *video)
1208 {
1209 acpi_status status = -ENOENT;
1210 struct pci_dev *dev;
1211
1212 if (!video)
1213 return -EINVAL;
1214
1215 dev = acpi_get_pci_dev(video->device->handle);
1216 if (!dev)
1217 return -ENODEV;
1218 pci_dev_put(dev);
1219
1220 /*
1221 * Since there is no HID, CID and so on for VGA driver, we have
1222 * to check well known required nodes.
1223 */
1224
1225 /* Does this device support video switching? */
1226 if (video->cap._DOS || video->cap._DOD) {
1227 if (!video->cap._DOS) {
1228 printk(KERN_WARNING FW_BUG
1229 "ACPI(%s) defines _DOD but not _DOS\n",
1230 acpi_device_bid(video->device));
1231 }
1232 video->flags.multihead = 1;
1233 status = 0;
1234 }
1235
1236 /* Does this device support retrieving a video ROM? */
1237 if (video->cap._ROM) {
1238 video->flags.rom = 1;
1239 status = 0;
1240 }
1241
1242 /* Does this device support configuring which video device to POST? */
1243 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1244 video->flags.post = 1;
1245 status = 0;
1246 }
1247
1248 return status;
1249 }
1250
1251 /*
1252 * --------------------------------------------------------------------------
1253 * Driver Interface
1254 * --------------------------------------------------------------------------
1255 */
1256
1257 /* device interface */
1258 static struct acpi_video_device_attrib *
1259 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1260 {
1261 struct acpi_video_enumerated_device *ids;
1262 int i;
1263
1264 for (i = 0; i < video->attached_count; i++) {
1265 ids = &video->attached_array[i];
1266 if ((ids->value.int_val & 0xffff) == device_id)
1267 return &ids->value.attrib;
1268 }
1269
1270 return NULL;
1271 }
1272
1273 static int
1274 acpi_video_get_device_type(struct acpi_video_bus *video,
1275 unsigned long device_id)
1276 {
1277 struct acpi_video_enumerated_device *ids;
1278 int i;
1279
1280 for (i = 0; i < video->attached_count; i++) {
1281 ids = &video->attached_array[i];
1282 if ((ids->value.int_val & 0xffff) == device_id)
1283 return ids->value.int_val;
1284 }
1285
1286 return 0;
1287 }
1288
1289 static int
1290 acpi_video_bus_get_one_device(struct acpi_device *device,
1291 struct acpi_video_bus *video)
1292 {
1293 unsigned long long device_id;
1294 int status, device_type;
1295 struct acpi_video_device *data;
1296 struct acpi_video_device_attrib *attribute;
1297
1298 status =
1299 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1300 /* Some device omits _ADR, we skip them instead of fail */
1301 if (ACPI_FAILURE(status))
1302 return 0;
1303
1304 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1305 if (!data)
1306 return -ENOMEM;
1307
1308 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1309 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1310 device->driver_data = data;
1311
1312 data->device_id = device_id;
1313 data->video = video;
1314 data->dev = device;
1315 INIT_DELAYED_WORK(&data->switch_brightness_work,
1316 acpi_video_switch_brightness);
1317
1318 attribute = acpi_video_get_device_attr(video, device_id);
1319
1320 if (attribute && attribute->device_id_scheme) {
1321 switch (attribute->display_type) {
1322 case ACPI_VIDEO_DISPLAY_CRT:
1323 data->flags.crt = 1;
1324 break;
1325 case ACPI_VIDEO_DISPLAY_TV:
1326 data->flags.tvout = 1;
1327 break;
1328 case ACPI_VIDEO_DISPLAY_DVI:
1329 data->flags.dvi = 1;
1330 break;
1331 case ACPI_VIDEO_DISPLAY_LCD:
1332 data->flags.lcd = 1;
1333 break;
1334 default:
1335 data->flags.unknown = 1;
1336 break;
1337 }
1338 if (attribute->bios_can_detect)
1339 data->flags.bios = 1;
1340 } else {
1341 /* Check for legacy IDs */
1342 device_type = acpi_video_get_device_type(video, device_id);
1343 /* Ignore bits 16 and 18-20 */
1344 switch (device_type & 0xffe2ffff) {
1345 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1346 data->flags.crt = 1;
1347 break;
1348 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1349 data->flags.lcd = 1;
1350 break;
1351 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1352 data->flags.tvout = 1;
1353 break;
1354 default:
1355 data->flags.unknown = 1;
1356 }
1357 }
1358
1359 acpi_video_device_bind(video, data);
1360 acpi_video_device_find_cap(data);
1361
1362 mutex_lock(&video->device_list_lock);
1363 list_add_tail(&data->entry, &video->video_device_list);
1364 mutex_unlock(&video->device_list_lock);
1365
1366 return status;
1367 }
1368
1369 /*
1370 * Arg:
1371 * video : video bus device
1372 *
1373 * Return:
1374 * none
1375 *
1376 * Enumerate the video device list of the video bus,
1377 * bind the ids with the corresponding video devices
1378 * under the video bus.
1379 */
1380
1381 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1382 {
1383 struct acpi_video_device *dev;
1384
1385 mutex_lock(&video->device_list_lock);
1386
1387 list_for_each_entry(dev, &video->video_device_list, entry)
1388 acpi_video_device_bind(video, dev);
1389
1390 mutex_unlock(&video->device_list_lock);
1391 }
1392
1393 /*
1394 * Arg:
1395 * video : video bus device
1396 * device : video output device under the video
1397 * bus
1398 *
1399 * Return:
1400 * none
1401 *
1402 * Bind the ids with the corresponding video devices
1403 * under the video bus.
1404 */
1405
1406 static void
1407 acpi_video_device_bind(struct acpi_video_bus *video,
1408 struct acpi_video_device *device)
1409 {
1410 struct acpi_video_enumerated_device *ids;
1411 int i;
1412
1413 for (i = 0; i < video->attached_count; i++) {
1414 ids = &video->attached_array[i];
1415 if (device->device_id == (ids->value.int_val & 0xffff)) {
1416 ids->bind_info = device;
1417 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1418 }
1419 }
1420 }
1421
1422 /*
1423 * Arg:
1424 * video : video bus device
1425 *
1426 * Return:
1427 * < 0 : error
1428 *
1429 * Call _DOD to enumerate all devices attached to display adapter
1430 *
1431 */
1432
1433 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1434 {
1435 int status;
1436 int count;
1437 int i;
1438 struct acpi_video_enumerated_device *active_list;
1439 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1440 union acpi_object *dod = NULL;
1441 union acpi_object *obj;
1442
1443 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1444 if (!ACPI_SUCCESS(status)) {
1445 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1446 return status;
1447 }
1448
1449 dod = buffer.pointer;
1450 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1451 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1452 status = -EFAULT;
1453 goto out;
1454 }
1455
1456 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1457 dod->package.count));
1458
1459 active_list = kcalloc(1 + dod->package.count,
1460 sizeof(struct acpi_video_enumerated_device),
1461 GFP_KERNEL);
1462 if (!active_list) {
1463 status = -ENOMEM;
1464 goto out;
1465 }
1466
1467 count = 0;
1468 for (i = 0; i < dod->package.count; i++) {
1469 obj = &dod->package.elements[i];
1470
1471 if (obj->type != ACPI_TYPE_INTEGER) {
1472 printk(KERN_ERR PREFIX
1473 "Invalid _DOD data in element %d\n", i);
1474 continue;
1475 }
1476
1477 active_list[count].value.int_val = obj->integer.value;
1478 active_list[count].bind_info = NULL;
1479 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1480 (int)obj->integer.value));
1481 count++;
1482 }
1483
1484 kfree(video->attached_array);
1485
1486 video->attached_array = active_list;
1487 video->attached_count = count;
1488
1489 out:
1490 kfree(buffer.pointer);
1491 return status;
1492 }
1493
1494 static int
1495 acpi_video_get_next_level(struct acpi_video_device *device,
1496 u32 level_current, u32 event)
1497 {
1498 int min, max, min_above, max_below, i, l, delta = 255;
1499 max = max_below = 0;
1500 min = min_above = 255;
1501 /* Find closest level to level_current */
1502 for (i = 2; i < device->brightness->count; i++) {
1503 l = device->brightness->levels[i];
1504 if (abs(l - level_current) < abs(delta)) {
1505 delta = l - level_current;
1506 if (!delta)
1507 break;
1508 }
1509 }
1510 /* Ajust level_current to closest available level */
1511 level_current += delta;
1512 for (i = 2; i < device->brightness->count; i++) {
1513 l = device->brightness->levels[i];
1514 if (l < min)
1515 min = l;
1516 if (l > max)
1517 max = l;
1518 if (l < min_above && l > level_current)
1519 min_above = l;
1520 if (l > max_below && l < level_current)
1521 max_below = l;
1522 }
1523
1524 switch (event) {
1525 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1526 return (level_current < max) ? min_above : min;
1527 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1528 return (level_current < max) ? min_above : max;
1529 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1530 return (level_current > min) ? max_below : min;
1531 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1532 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1533 return 0;
1534 default:
1535 return level_current;
1536 }
1537 }
1538
1539 static void
1540 acpi_video_switch_brightness(struct work_struct *work)
1541 {
1542 struct acpi_video_device *device = container_of(to_delayed_work(work),
1543 struct acpi_video_device, switch_brightness_work);
1544 unsigned long long level_current, level_next;
1545 int event = device->switch_brightness_event;
1546 int result = -EINVAL;
1547
1548 /* no warning message if acpi_backlight=vendor or a quirk is used */
1549 if (!acpi_video_verify_backlight_support())
1550 return;
1551
1552 if (!device->brightness)
1553 goto out;
1554
1555 result = acpi_video_device_lcd_get_level_current(device,
1556 &level_current,
1557 false);
1558 if (result)
1559 goto out;
1560
1561 level_next = acpi_video_get_next_level(device, level_current, event);
1562
1563 result = acpi_video_device_lcd_set_level(device, level_next);
1564
1565 if (!result)
1566 backlight_force_update(device->backlight,
1567 BACKLIGHT_UPDATE_HOTKEY);
1568
1569 out:
1570 if (result)
1571 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1572 }
1573
1574 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1575 void **edid)
1576 {
1577 struct acpi_video_bus *video;
1578 struct acpi_video_device *video_device;
1579 union acpi_object *buffer = NULL;
1580 acpi_status status;
1581 int i, length;
1582
1583 if (!device || !acpi_driver_data(device))
1584 return -EINVAL;
1585
1586 video = acpi_driver_data(device);
1587
1588 for (i = 0; i < video->attached_count; i++) {
1589 video_device = video->attached_array[i].bind_info;
1590 length = 256;
1591
1592 if (!video_device)
1593 continue;
1594
1595 if (!video_device->cap._DDC)
1596 continue;
1597
1598 if (type) {
1599 switch (type) {
1600 case ACPI_VIDEO_DISPLAY_CRT:
1601 if (!video_device->flags.crt)
1602 continue;
1603 break;
1604 case ACPI_VIDEO_DISPLAY_TV:
1605 if (!video_device->flags.tvout)
1606 continue;
1607 break;
1608 case ACPI_VIDEO_DISPLAY_DVI:
1609 if (!video_device->flags.dvi)
1610 continue;
1611 break;
1612 case ACPI_VIDEO_DISPLAY_LCD:
1613 if (!video_device->flags.lcd)
1614 continue;
1615 break;
1616 }
1617 } else if (video_device->device_id != device_id) {
1618 continue;
1619 }
1620
1621 status = acpi_video_device_EDID(video_device, &buffer, length);
1622
1623 if (ACPI_FAILURE(status) || !buffer ||
1624 buffer->type != ACPI_TYPE_BUFFER) {
1625 length = 128;
1626 status = acpi_video_device_EDID(video_device, &buffer,
1627 length);
1628 if (ACPI_FAILURE(status) || !buffer ||
1629 buffer->type != ACPI_TYPE_BUFFER) {
1630 continue;
1631 }
1632 }
1633
1634 *edid = buffer->buffer.pointer;
1635 return length;
1636 }
1637
1638 return -ENODEV;
1639 }
1640 EXPORT_SYMBOL(acpi_video_get_edid);
1641
1642 static int
1643 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1644 struct acpi_device *device)
1645 {
1646 int status = 0;
1647 struct acpi_device *dev;
1648
1649 /*
1650 * There are systems where video module known to work fine regardless
1651 * of broken _DOD and ignoring returned value here doesn't cause
1652 * any issues later.
1653 */
1654 acpi_video_device_enumerate(video);
1655
1656 list_for_each_entry(dev, &device->children, node) {
1657
1658 status = acpi_video_bus_get_one_device(dev, video);
1659 if (status) {
1660 dev_err(&dev->dev, "Can't attach device\n");
1661 break;
1662 }
1663 }
1664 return status;
1665 }
1666
1667 /* acpi_video interface */
1668
1669 /*
1670 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1671 * preform any automatic brightness change on receiving a notification.
1672 */
1673 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1674 {
1675 return acpi_video_bus_DOS(video, 0,
1676 acpi_osi_is_win8() ? 1 : 0);
1677 }
1678
1679 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1680 {
1681 return acpi_video_bus_DOS(video, 0,
1682 acpi_osi_is_win8() ? 0 : 1);
1683 }
1684
1685 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1686 {
1687 struct acpi_video_bus *video = acpi_driver_data(device);
1688 struct input_dev *input;
1689 int keycode = 0;
1690
1691 if (!video || !video->input)
1692 return;
1693
1694 input = video->input;
1695
1696 switch (event) {
1697 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1698 * most likely via hotkey. */
1699 keycode = KEY_SWITCHVIDEOMODE;
1700 break;
1701
1702 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1703 * connector. */
1704 acpi_video_device_enumerate(video);
1705 acpi_video_device_rebind(video);
1706 keycode = KEY_SWITCHVIDEOMODE;
1707 break;
1708
1709 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1710 keycode = KEY_SWITCHVIDEOMODE;
1711 break;
1712 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1713 keycode = KEY_VIDEO_NEXT;
1714 break;
1715 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1716 keycode = KEY_VIDEO_PREV;
1717 break;
1718
1719 default:
1720 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1721 "Unsupported event [0x%x]\n", event));
1722 break;
1723 }
1724
1725 if (acpi_notifier_call_chain(device, event, 0))
1726 /* Something vetoed the keypress. */
1727 keycode = 0;
1728
1729 if (keycode) {
1730 input_report_key(input, keycode, 1);
1731 input_sync(input);
1732 input_report_key(input, keycode, 0);
1733 input_sync(input);
1734 }
1735
1736 return;
1737 }
1738
1739 static void brightness_switch_event(struct acpi_video_device *video_device,
1740 u32 event)
1741 {
1742 if (!brightness_switch_enabled)
1743 return;
1744
1745 video_device->switch_brightness_event = event;
1746 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10);
1747 }
1748
1749 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1750 {
1751 struct acpi_video_device *video_device = data;
1752 struct acpi_device *device = NULL;
1753 struct acpi_video_bus *bus;
1754 struct input_dev *input;
1755 int keycode = 0;
1756
1757 if (!video_device)
1758 return;
1759
1760 device = video_device->dev;
1761 bus = video_device->video;
1762 input = bus->input;
1763
1764 switch (event) {
1765 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1766 brightness_switch_event(video_device, event);
1767 keycode = KEY_BRIGHTNESS_CYCLE;
1768 break;
1769 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1770 brightness_switch_event(video_device, event);
1771 keycode = KEY_BRIGHTNESSUP;
1772 break;
1773 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1774 brightness_switch_event(video_device, event);
1775 keycode = KEY_BRIGHTNESSDOWN;
1776 break;
1777 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1778 brightness_switch_event(video_device, event);
1779 keycode = KEY_BRIGHTNESS_ZERO;
1780 break;
1781 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1782 brightness_switch_event(video_device, event);
1783 keycode = KEY_DISPLAY_OFF;
1784 break;
1785 default:
1786 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1787 "Unsupported event [0x%x]\n", event));
1788 break;
1789 }
1790
1791 acpi_notifier_call_chain(device, event, 0);
1792
1793 if (keycode) {
1794 input_report_key(input, keycode, 1);
1795 input_sync(input);
1796 input_report_key(input, keycode, 0);
1797 input_sync(input);
1798 }
1799
1800 return;
1801 }
1802
1803 static int acpi_video_resume(struct notifier_block *nb,
1804 unsigned long val, void *ign)
1805 {
1806 struct acpi_video_bus *video;
1807 struct acpi_video_device *video_device;
1808 int i;
1809
1810 switch (val) {
1811 case PM_HIBERNATION_PREPARE:
1812 case PM_SUSPEND_PREPARE:
1813 case PM_RESTORE_PREPARE:
1814 return NOTIFY_DONE;
1815 }
1816
1817 video = container_of(nb, struct acpi_video_bus, pm_nb);
1818
1819 dev_info(&video->device->dev, "Restoring backlight state\n");
1820
1821 for (i = 0; i < video->attached_count; i++) {
1822 video_device = video->attached_array[i].bind_info;
1823 if (video_device && video_device->backlight)
1824 acpi_video_set_brightness(video_device->backlight);
1825 }
1826
1827 return NOTIFY_OK;
1828 }
1829
1830 static acpi_status
1831 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1832 void **return_value)
1833 {
1834 struct acpi_device *device = context;
1835 struct acpi_device *sibling;
1836 int result;
1837
1838 if (handle == device->handle)
1839 return AE_CTRL_TERMINATE;
1840
1841 result = acpi_bus_get_device(handle, &sibling);
1842 if (result)
1843 return AE_OK;
1844
1845 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1846 return AE_ALREADY_EXISTS;
1847
1848 return AE_OK;
1849 }
1850
1851 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1852 {
1853 struct backlight_properties props;
1854 struct pci_dev *pdev;
1855 acpi_handle acpi_parent;
1856 struct device *parent = NULL;
1857 int result;
1858 static int count;
1859 char *name;
1860
1861 result = acpi_video_init_brightness(device);
1862 if (result)
1863 return;
1864 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1865 if (!name)
1866 return;
1867 count++;
1868
1869 acpi_get_parent(device->dev->handle, &acpi_parent);
1870
1871 pdev = acpi_get_pci_dev(acpi_parent);
1872 if (pdev) {
1873 parent = &pdev->dev;
1874 pci_dev_put(pdev);
1875 }
1876
1877 memset(&props, 0, sizeof(struct backlight_properties));
1878 props.type = BACKLIGHT_FIRMWARE;
1879 props.max_brightness = device->brightness->count - 3;
1880 device->backlight = backlight_device_register(name,
1881 parent,
1882 device,
1883 &acpi_backlight_ops,
1884 &props);
1885 kfree(name);
1886 if (IS_ERR(device->backlight))
1887 return;
1888
1889 /*
1890 * Save current brightness level in case we have to restore it
1891 * before acpi_video_device_lcd_set_level() is called next time.
1892 */
1893 device->backlight->props.brightness =
1894 acpi_video_get_brightness(device->backlight);
1895
1896 device->cooling_dev = thermal_cooling_device_register("LCD",
1897 device->dev, &video_cooling_ops);
1898 if (IS_ERR(device->cooling_dev)) {
1899 /*
1900 * Set cooling_dev to NULL so we don't crash trying to free it.
1901 * Also, why the hell we are returning early and not attempt to
1902 * register video output if cooling device registration failed?
1903 * -- dtor
1904 */
1905 device->cooling_dev = NULL;
1906 return;
1907 }
1908
1909 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1910 device->cooling_dev->id);
1911 result = sysfs_create_link(&device->dev->dev.kobj,
1912 &device->cooling_dev->device.kobj,
1913 "thermal_cooling");
1914 if (result)
1915 printk(KERN_ERR PREFIX "Create sysfs link\n");
1916 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1917 &device->dev->dev.kobj, "device");
1918 if (result)
1919 printk(KERN_ERR PREFIX "Create sysfs link\n");
1920 }
1921
1922 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1923 {
1924 struct acpi_video_device *dev;
1925
1926 if (video->backlight_registered)
1927 return 0;
1928
1929 if (!acpi_video_verify_backlight_support())
1930 return 0;
1931
1932 mutex_lock(&video->device_list_lock);
1933 list_for_each_entry(dev, &video->video_device_list, entry)
1934 acpi_video_dev_register_backlight(dev);
1935 mutex_unlock(&video->device_list_lock);
1936
1937 video->backlight_registered = true;
1938
1939 video->pm_nb.notifier_call = acpi_video_resume;
1940 video->pm_nb.priority = 0;
1941 return register_pm_notifier(&video->pm_nb);
1942 }
1943
1944 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1945 {
1946 if (device->backlight) {
1947 backlight_device_unregister(device->backlight);
1948 device->backlight = NULL;
1949 }
1950 if (device->brightness) {
1951 kfree(device->brightness->levels);
1952 kfree(device->brightness);
1953 device->brightness = NULL;
1954 }
1955 if (device->cooling_dev) {
1956 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1957 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1958 thermal_cooling_device_unregister(device->cooling_dev);
1959 device->cooling_dev = NULL;
1960 }
1961 }
1962
1963 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1964 {
1965 struct acpi_video_device *dev;
1966 int error;
1967
1968 if (!video->backlight_registered)
1969 return 0;
1970
1971 error = unregister_pm_notifier(&video->pm_nb);
1972
1973 mutex_lock(&video->device_list_lock);
1974 list_for_each_entry(dev, &video->video_device_list, entry)
1975 acpi_video_dev_unregister_backlight(dev);
1976 mutex_unlock(&video->device_list_lock);
1977
1978 video->backlight_registered = false;
1979
1980 return error;
1981 }
1982
1983 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1984 {
1985 acpi_status status;
1986 struct acpi_device *adev = device->dev;
1987
1988 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1989 acpi_video_device_notify, device);
1990 if (ACPI_FAILURE(status))
1991 dev_err(&adev->dev, "Error installing notify handler\n");
1992 else
1993 device->flags.notify = 1;
1994 }
1995
1996 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1997 {
1998 struct input_dev *input;
1999 struct acpi_video_device *dev;
2000 int error;
2001
2002 video->input = input = input_allocate_device();
2003 if (!input) {
2004 error = -ENOMEM;
2005 goto out;
2006 }
2007
2008 error = acpi_video_bus_start_devices(video);
2009 if (error)
2010 goto err_free_input;
2011
2012 snprintf(video->phys, sizeof(video->phys),
2013 "%s/video/input0", acpi_device_hid(video->device));
2014
2015 input->name = acpi_device_name(video->device);
2016 input->phys = video->phys;
2017 input->id.bustype = BUS_HOST;
2018 input->id.product = 0x06;
2019 input->dev.parent = &video->device->dev;
2020 input->evbit[0] = BIT(EV_KEY);
2021 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2022 set_bit(KEY_VIDEO_NEXT, input->keybit);
2023 set_bit(KEY_VIDEO_PREV, input->keybit);
2024 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2025 set_bit(KEY_BRIGHTNESSUP, input->keybit);
2026 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2027 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2028 set_bit(KEY_DISPLAY_OFF, input->keybit);
2029
2030 error = input_register_device(input);
2031 if (error)
2032 goto err_stop_dev;
2033
2034 mutex_lock(&video->device_list_lock);
2035 list_for_each_entry(dev, &video->video_device_list, entry)
2036 acpi_video_dev_add_notify_handler(dev);
2037 mutex_unlock(&video->device_list_lock);
2038
2039 return 0;
2040
2041 err_stop_dev:
2042 acpi_video_bus_stop_devices(video);
2043 err_free_input:
2044 input_free_device(input);
2045 video->input = NULL;
2046 out:
2047 return error;
2048 }
2049
2050 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
2051 {
2052 if (dev->flags.notify) {
2053 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
2054 acpi_video_device_notify);
2055 dev->flags.notify = 0;
2056 }
2057 }
2058
2059 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
2060 {
2061 struct acpi_video_device *dev;
2062
2063 mutex_lock(&video->device_list_lock);
2064 list_for_each_entry(dev, &video->video_device_list, entry)
2065 acpi_video_dev_remove_notify_handler(dev);
2066 mutex_unlock(&video->device_list_lock);
2067
2068 acpi_video_bus_stop_devices(video);
2069 input_unregister_device(video->input);
2070 video->input = NULL;
2071 }
2072
2073 static int acpi_video_backlight_notify(struct notifier_block *nb,
2074 unsigned long val, void *bd)
2075 {
2076 struct backlight_device *backlight = bd;
2077 struct acpi_video_bus *video;
2078
2079 /* acpi_video_verify_backlight_support only cares about raw devices */
2080 if (backlight->props.type != BACKLIGHT_RAW)
2081 return NOTIFY_DONE;
2082
2083 video = container_of(nb, struct acpi_video_bus, backlight_nb);
2084
2085 switch (val) {
2086 case BACKLIGHT_REGISTERED:
2087 if (!acpi_video_verify_backlight_support())
2088 acpi_video_bus_unregister_backlight(video);
2089 break;
2090 case BACKLIGHT_UNREGISTERED:
2091 acpi_video_bus_register_backlight(video);
2092 break;
2093 }
2094
2095 return NOTIFY_OK;
2096 }
2097
2098 static int acpi_video_bus_add_backlight_notify_handler(
2099 struct acpi_video_bus *video)
2100 {
2101 int error;
2102
2103 video->backlight_nb.notifier_call = acpi_video_backlight_notify;
2104 video->backlight_nb.priority = 0;
2105 error = backlight_register_notifier(&video->backlight_nb);
2106 if (error == 0)
2107 video->backlight_notifier_registered = true;
2108
2109 return error;
2110 }
2111
2112 static int acpi_video_bus_remove_backlight_notify_handler(
2113 struct acpi_video_bus *video)
2114 {
2115 if (!video->backlight_notifier_registered)
2116 return 0;
2117
2118 video->backlight_notifier_registered = false;
2119
2120 return backlight_unregister_notifier(&video->backlight_nb);
2121 }
2122
2123 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
2124 {
2125 struct acpi_video_device *dev, *next;
2126
2127 mutex_lock(&video->device_list_lock);
2128 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
2129 list_del(&dev->entry);
2130 kfree(dev);
2131 }
2132 mutex_unlock(&video->device_list_lock);
2133
2134 return 0;
2135 }
2136
2137 static int instance;
2138
2139 static int acpi_video_bus_add(struct acpi_device *device)
2140 {
2141 struct acpi_video_bus *video;
2142 int error;
2143 acpi_status status;
2144
2145 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
2146 device->parent->handle, 1,
2147 acpi_video_bus_match, NULL,
2148 device, NULL);
2149 if (status == AE_ALREADY_EXISTS) {
2150 printk(KERN_WARNING FW_BUG
2151 "Duplicate ACPI video bus devices for the"
2152 " same VGA controller, please try module "
2153 "parameter \"video.allow_duplicates=1\""
2154 "if the current driver doesn't work.\n");
2155 if (!allow_duplicates)
2156 return -ENODEV;
2157 }
2158
2159 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2160 if (!video)
2161 return -ENOMEM;
2162
2163 /* a hack to fix the duplicate name "VID" problem on T61 */
2164 if (!strcmp(device->pnp.bus_id, "VID")) {
2165 if (instance)
2166 device->pnp.bus_id[3] = '0' + instance;
2167 instance++;
2168 }
2169 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2170 if (!strcmp(device->pnp.bus_id, "VGA")) {
2171 if (instance)
2172 device->pnp.bus_id[3] = '0' + instance;
2173 instance++;
2174 }
2175
2176 video->device = device;
2177 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2178 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2179 device->driver_data = video;
2180
2181 acpi_video_bus_find_cap(video);
2182 error = acpi_video_bus_check(video);
2183 if (error)
2184 goto err_free_video;
2185
2186 mutex_init(&video->device_list_lock);
2187 INIT_LIST_HEAD(&video->video_device_list);
2188
2189 error = acpi_video_bus_get_devices(video, device);
2190 if (error)
2191 goto err_put_video;
2192
2193 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
2194 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2195 video->flags.multihead ? "yes" : "no",
2196 video->flags.rom ? "yes" : "no",
2197 video->flags.post ? "yes" : "no");
2198 mutex_lock(&video_list_lock);
2199 list_add_tail(&video->entry, &video_bus_head);
2200 mutex_unlock(&video_list_lock);
2201
2202 acpi_video_bus_register_backlight(video);
2203 acpi_video_bus_add_notify_handler(video);
2204 acpi_video_bus_add_backlight_notify_handler(video);
2205
2206 return 0;
2207
2208 err_put_video:
2209 acpi_video_bus_put_devices(video);
2210 kfree(video->attached_array);
2211 err_free_video:
2212 kfree(video);
2213 device->driver_data = NULL;
2214
2215 return error;
2216 }
2217
2218 static int acpi_video_bus_remove(struct acpi_device *device)
2219 {
2220 struct acpi_video_bus *video = NULL;
2221
2222
2223 if (!device || !acpi_driver_data(device))
2224 return -EINVAL;
2225
2226 video = acpi_driver_data(device);
2227
2228 acpi_video_bus_remove_backlight_notify_handler(video);
2229 acpi_video_bus_remove_notify_handler(video);
2230 acpi_video_bus_unregister_backlight(video);
2231 acpi_video_bus_put_devices(video);
2232
2233 mutex_lock(&video_list_lock);
2234 list_del(&video->entry);
2235 mutex_unlock(&video_list_lock);
2236
2237 kfree(video->attached_array);
2238 kfree(video);
2239
2240 return 0;
2241 }
2242
2243 static int __init is_i740(struct pci_dev *dev)
2244 {
2245 if (dev->device == 0x00D1)
2246 return 1;
2247 if (dev->device == 0x7000)
2248 return 1;
2249 return 0;
2250 }
2251
2252 static int __init intel_opregion_present(void)
2253 {
2254 int opregion = 0;
2255 struct pci_dev *dev = NULL;
2256 u32 address;
2257
2258 for_each_pci_dev(dev) {
2259 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2260 continue;
2261 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2262 continue;
2263 /* We don't want to poke around undefined i740 registers */
2264 if (is_i740(dev))
2265 continue;
2266 pci_read_config_dword(dev, 0xfc, &address);
2267 if (!address)
2268 continue;
2269 opregion = 1;
2270 }
2271 return opregion;
2272 }
2273
2274 int acpi_video_register(void)
2275 {
2276 int result = 0;
2277 if (register_count) {
2278 /*
2279 * if the function of acpi_video_register is already called,
2280 * don't register the acpi_vide_bus again and return no error.
2281 */
2282 return 0;
2283 }
2284
2285 mutex_init(&video_list_lock);
2286 INIT_LIST_HEAD(&video_bus_head);
2287
2288 result = acpi_bus_register_driver(&acpi_video_bus);
2289 if (result < 0)
2290 return -ENODEV;
2291
2292 /*
2293 * When the acpi_video_bus is loaded successfully, increase
2294 * the counter reference.
2295 */
2296 register_count = 1;
2297
2298 return 0;
2299 }
2300 EXPORT_SYMBOL(acpi_video_register);
2301
2302 void acpi_video_unregister(void)
2303 {
2304 if (!register_count) {
2305 /*
2306 * If the acpi video bus is already unloaded, don't
2307 * unload it again and return directly.
2308 */
2309 return;
2310 }
2311 acpi_bus_unregister_driver(&acpi_video_bus);
2312
2313 register_count = 0;
2314
2315 return;
2316 }
2317 EXPORT_SYMBOL(acpi_video_unregister);
2318
2319 void acpi_video_unregister_backlight(void)
2320 {
2321 struct acpi_video_bus *video;
2322
2323 if (!register_count)
2324 return;
2325
2326 mutex_lock(&video_list_lock);
2327 list_for_each_entry(video, &video_bus_head, entry)
2328 acpi_video_bus_unregister_backlight(video);
2329 mutex_unlock(&video_list_lock);
2330 }
2331 EXPORT_SYMBOL(acpi_video_unregister_backlight);
2332
2333 /*
2334 * This is kind of nasty. Hardware using Intel chipsets may require
2335 * the video opregion code to be run first in order to initialise
2336 * state before any ACPI video calls are made. To handle this we defer
2337 * registration of the video class until the opregion code has run.
2338 */
2339
2340 static int __init acpi_video_init(void)
2341 {
2342 dmi_check_system(video_dmi_table);
2343
2344 if (intel_opregion_present())
2345 return 0;
2346
2347 return acpi_video_register();
2348 }
2349
2350 static void __exit acpi_video_exit(void)
2351 {
2352 acpi_video_unregister();
2353
2354 return;
2355 }
2356
2357 module_init(acpi_video_init);
2358 module_exit(acpi_video_exit);
Linux kernel - Deliverables
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