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