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