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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * video.c - ACPI Video Driver
4 *
5 * Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
6 * Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
7 * Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
8 */
9
10#define pr_fmt(fmt) "ACPI: video: " fmt
11
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/init.h>
15#include <linux/types.h>
16#include <linux/list.h>
17#include <linux/mutex.h>
18#include <linux/input.h>
19#include <linux/backlight.h>
20#include <linux/thermal.h>
21#include <linux/sort.h>
22#include <linux/pci.h>
23#include <linux/pci_ids.h>
24#include <linux/slab.h>
25#include <linux/dmi.h>
26#include <linux/suspend.h>
27#include <linux/acpi.h>
28#include <acpi/video.h>
29#include <linux/uaccess.h>
30
31#define ACPI_VIDEO_BUS_NAME "Video Bus"
32#define ACPI_VIDEO_DEVICE_NAME "Video Device"
33
34#define MAX_NAME_LEN 20
35
36MODULE_AUTHOR("Bruno Ducrot");
37MODULE_DESCRIPTION("ACPI Video Driver");
38MODULE_LICENSE("GPL");
39
40static bool brightness_switch_enabled = true;
41module_param(brightness_switch_enabled, bool, 0644);
42
43/*
44 * By default, we don't allow duplicate ACPI video bus devices
45 * under the same VGA controller
46 */
47static bool allow_duplicates;
48module_param(allow_duplicates, bool, 0644);
49
50#define REPORT_OUTPUT_KEY_EVENTS 0x01
51#define REPORT_BRIGHTNESS_KEY_EVENTS 0x02
52static int report_key_events = -1;
53module_param(report_key_events, int, 0644);
54MODULE_PARM_DESC(report_key_events,
55 "0: none, 1: output changes, 2: brightness changes, 3: all");
56
57static int hw_changes_brightness = -1;
58module_param(hw_changes_brightness, int, 0644);
59MODULE_PARM_DESC(hw_changes_brightness,
60 "Set this to 1 on buggy hw which changes the brightness itself when "
61 "a hotkey is pressed: -1: auto, 0: normal 1: hw-changes-brightness");
62
63/*
64 * Whether the struct acpi_video_device_attrib::device_id_scheme bit should be
65 * assumed even if not actually set.
66 */
67static bool device_id_scheme = false;
68module_param(device_id_scheme, bool, 0444);
69
70static int only_lcd = -1;
71module_param(only_lcd, int, 0444);
72
73static int register_backlight_delay;
74module_param(register_backlight_delay, int, 0444);
75MODULE_PARM_DESC(register_backlight_delay,
76 "Delay in seconds before doing fallback (non GPU driver triggered) "
77 "backlight registration, set to 0 to disable.");
78
79static bool may_report_brightness_keys;
80static int register_count;
81static DEFINE_MUTEX(register_count_mutex);
82static DEFINE_MUTEX(video_list_lock);
83static LIST_HEAD(video_bus_head);
84static int acpi_video_bus_add(struct acpi_device *device);
85static void acpi_video_bus_remove(struct acpi_device *device);
86static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
87static void acpi_video_bus_register_backlight_work(struct work_struct *ignored);
88static DECLARE_DELAYED_WORK(video_bus_register_backlight_work,
89 acpi_video_bus_register_backlight_work);
90
91/*
92 * Indices in the _BCL method response: the first two items are special,
93 * the rest are all supported levels.
94 *
95 * See page 575 of the ACPI spec 3.0
96 */
97enum acpi_video_level_idx {
98 ACPI_VIDEO_AC_LEVEL, /* level when machine has full power */
99 ACPI_VIDEO_BATTERY_LEVEL, /* level when machine is on batteries */
100 ACPI_VIDEO_FIRST_LEVEL, /* actual supported levels begin here */
101};
102
103static const struct acpi_device_id video_device_ids[] = {
104 {ACPI_VIDEO_HID, 0},
105 {"", 0},
106};
107MODULE_DEVICE_TABLE(acpi, video_device_ids);
108
109static struct acpi_driver acpi_video_bus = {
110 .name = "video",
111 .class = ACPI_VIDEO_CLASS,
112 .ids = video_device_ids,
113 .ops = {
114 .add = acpi_video_bus_add,
115 .remove = acpi_video_bus_remove,
116 .notify = acpi_video_bus_notify,
117 },
118};
119
120struct acpi_video_bus_flags {
121 u8 multihead:1; /* can switch video heads */
122 u8 rom:1; /* can retrieve a video rom */
123 u8 post:1; /* can configure the head to */
124 u8 reserved:5;
125};
126
127struct acpi_video_bus_cap {
128 u8 _DOS:1; /* Enable/Disable output switching */
129 u8 _DOD:1; /* Enumerate all devices attached to display adapter */
130 u8 _ROM:1; /* Get ROM Data */
131 u8 _GPD:1; /* Get POST Device */
132 u8 _SPD:1; /* Set POST Device */
133 u8 _VPO:1; /* Video POST Options */
134 u8 reserved:2;
135};
136
137struct acpi_video_device_attrib {
138 u32 display_index:4; /* A zero-based instance of the Display */
139 u32 display_port_attachment:4; /* This field differentiates the display type */
140 u32 display_type:4; /* Describe the specific type in use */
141 u32 vendor_specific:4; /* Chipset Vendor Specific */
142 u32 bios_can_detect:1; /* BIOS can detect the device */
143 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to
144 the VGA device. */
145 u32 pipe_id:3; /* For VGA multiple-head devices. */
146 u32 reserved:10; /* Must be 0 */
147
148 /*
149 * The device ID might not actually follow the scheme described by this
150 * struct acpi_video_device_attrib. If it does, then this bit
151 * device_id_scheme is set; otherwise, other fields should be ignored.
152 *
153 * (but also see the global flag device_id_scheme)
154 */
155 u32 device_id_scheme:1;
156};
157
158struct acpi_video_enumerated_device {
159 union {
160 u32 int_val;
161 struct acpi_video_device_attrib attrib;
162 } value;
163 struct acpi_video_device *bind_info;
164};
165
166struct acpi_video_bus {
167 struct acpi_device *device;
168 bool backlight_registered;
169 u8 dos_setting;
170 struct acpi_video_enumerated_device *attached_array;
171 u8 attached_count;
172 u8 child_count;
173 struct acpi_video_bus_cap cap;
174 struct acpi_video_bus_flags flags;
175 struct list_head video_device_list;
176 struct mutex device_list_lock; /* protects video_device_list */
177 struct list_head entry;
178 struct input_dev *input;
179 char phys[32]; /* for input device */
180 struct notifier_block pm_nb;
181};
182
183struct acpi_video_device_flags {
184 u8 crt:1;
185 u8 lcd:1;
186 u8 tvout:1;
187 u8 dvi:1;
188 u8 bios:1;
189 u8 unknown:1;
190 u8 notify:1;
191 u8 reserved:1;
192};
193
194struct acpi_video_device_cap {
195 u8 _ADR:1; /* Return the unique ID */
196 u8 _BCL:1; /* Query list of brightness control levels supported */
197 u8 _BCM:1; /* Set the brightness level */
198 u8 _BQC:1; /* Get current brightness level */
199 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
200 u8 _DDC:1; /* Return the EDID for this device */
201};
202
203struct acpi_video_device {
204 unsigned long device_id;
205 struct acpi_video_device_flags flags;
206 struct acpi_video_device_cap cap;
207 struct list_head entry;
208 struct delayed_work switch_brightness_work;
209 int switch_brightness_event;
210 struct acpi_video_bus *video;
211 struct acpi_device *dev;
212 struct acpi_video_device_brightness *brightness;
213 struct backlight_device *backlight;
214 struct thermal_cooling_device *cooling_dev;
215};
216
217static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
218static void acpi_video_device_rebind(struct acpi_video_bus *video);
219static void acpi_video_device_bind(struct acpi_video_bus *video,
220 struct acpi_video_device *device);
221static int acpi_video_device_enumerate(struct acpi_video_bus *video);
222static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
223 int level);
224static int acpi_video_device_lcd_get_level_current(
225 struct acpi_video_device *device,
226 unsigned long long *level, bool raw);
227static int acpi_video_get_next_level(struct acpi_video_device *device,
228 u32 level_current, u32 event);
229static void acpi_video_switch_brightness(struct work_struct *work);
230
231/* backlight device sysfs support */
232static int acpi_video_get_brightness(struct backlight_device *bd)
233{
234 unsigned long long cur_level;
235 int i;
236 struct acpi_video_device *vd = bl_get_data(bd);
237
238 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
239 return -EINVAL;
240 for (i = ACPI_VIDEO_FIRST_LEVEL; i < vd->brightness->count; i++) {
241 if (vd->brightness->levels[i] == cur_level)
242 return i - ACPI_VIDEO_FIRST_LEVEL;
243 }
244 return 0;
245}
246
247static int acpi_video_set_brightness(struct backlight_device *bd)
248{
249 int request_level = bd->props.brightness + ACPI_VIDEO_FIRST_LEVEL;
250 struct acpi_video_device *vd = bl_get_data(bd);
251
252 cancel_delayed_work(&vd->switch_brightness_work);
253 return acpi_video_device_lcd_set_level(vd,
254 vd->brightness->levels[request_level]);
255}
256
257static const struct backlight_ops acpi_backlight_ops = {
258 .get_brightness = acpi_video_get_brightness,
259 .update_status = acpi_video_set_brightness,
260};
261
262/* thermal cooling device callbacks */
263static int video_get_max_state(struct thermal_cooling_device *cooling_dev,
264 unsigned long *state)
265{
266 struct acpi_device *device = cooling_dev->devdata;
267 struct acpi_video_device *video = acpi_driver_data(device);
268
269 *state = video->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1;
270 return 0;
271}
272
273static int video_get_cur_state(struct thermal_cooling_device *cooling_dev,
274 unsigned long *state)
275{
276 struct acpi_device *device = cooling_dev->devdata;
277 struct acpi_video_device *video = acpi_driver_data(device);
278 unsigned long long level;
279 int offset;
280
281 if (acpi_video_device_lcd_get_level_current(video, &level, false))
282 return -EINVAL;
283 for (offset = ACPI_VIDEO_FIRST_LEVEL; offset < video->brightness->count;
284 offset++)
285 if (level == video->brightness->levels[offset]) {
286 *state = video->brightness->count - offset - 1;
287 return 0;
288 }
289
290 return -EINVAL;
291}
292
293static int
294video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
295{
296 struct acpi_device *device = cooling_dev->devdata;
297 struct acpi_video_device *video = acpi_driver_data(device);
298 int level;
299
300 if (state >= video->brightness->count - ACPI_VIDEO_FIRST_LEVEL)
301 return -EINVAL;
302
303 state = video->brightness->count - state;
304 level = video->brightness->levels[state - 1];
305 return acpi_video_device_lcd_set_level(video, level);
306}
307
308static const struct thermal_cooling_device_ops video_cooling_ops = {
309 .get_max_state = video_get_max_state,
310 .get_cur_state = video_get_cur_state,
311 .set_cur_state = video_set_cur_state,
312};
313
314/*
315 * --------------------------------------------------------------------------
316 * Video Management
317 * --------------------------------------------------------------------------
318 */
319
320static int
321acpi_video_device_lcd_query_levels(acpi_handle handle,
322 union acpi_object **levels)
323{
324 int status;
325 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
326 union acpi_object *obj;
327
328
329 *levels = NULL;
330
331 status = acpi_evaluate_object(handle, "_BCL", NULL, &buffer);
332 if (ACPI_FAILURE(status))
333 return status;
334 obj = (union acpi_object *)buffer.pointer;
335 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
336 acpi_handle_info(handle, "Invalid _BCL data\n");
337 status = -EFAULT;
338 goto err;
339 }
340
341 *levels = obj;
342
343 return 0;
344
345err:
346 kfree(buffer.pointer);
347
348 return status;
349}
350
351static int
352acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
353{
354 int status;
355 int state;
356
357 status = acpi_execute_simple_method(device->dev->handle,
358 "_BCM", level);
359 if (ACPI_FAILURE(status)) {
360 acpi_handle_info(device->dev->handle, "_BCM evaluation failed\n");
361 return -EIO;
362 }
363
364 device->brightness->curr = level;
365 for (state = ACPI_VIDEO_FIRST_LEVEL; state < device->brightness->count;
366 state++)
367 if (level == device->brightness->levels[state]) {
368 if (device->backlight)
369 device->backlight->props.brightness =
370 state - ACPI_VIDEO_FIRST_LEVEL;
371 return 0;
372 }
373
374 acpi_handle_info(device->dev->handle, "Current brightness invalid\n");
375 return -EINVAL;
376}
377
378/*
379 * For some buggy _BQC methods, we need to add a constant value to
380 * the _BQC return value to get the actual current brightness level
381 */
382
383static int bqc_offset_aml_bug_workaround;
384static int video_set_bqc_offset(const struct dmi_system_id *d)
385{
386 bqc_offset_aml_bug_workaround = 9;
387 return 0;
388}
389
390static int video_set_device_id_scheme(const struct dmi_system_id *d)
391{
392 device_id_scheme = true;
393 return 0;
394}
395
396static int video_enable_only_lcd(const struct dmi_system_id *d)
397{
398 only_lcd = true;
399 return 0;
400}
401
402static int video_set_report_key_events(const struct dmi_system_id *id)
403{
404 if (report_key_events == -1)
405 report_key_events = (uintptr_t)id->driver_data;
406 return 0;
407}
408
409static int video_hw_changes_brightness(
410 const struct dmi_system_id *d)
411{
412 if (hw_changes_brightness == -1)
413 hw_changes_brightness = 1;
414 return 0;
415}
416
417static const struct dmi_system_id video_dmi_table[] = {
418 /*
419 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
420 */
421 {
422 .callback = video_set_bqc_offset,
423 .ident = "Acer Aspire 5720",
424 .matches = {
425 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
426 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
427 },
428 },
429 {
430 .callback = video_set_bqc_offset,
431 .ident = "Acer Aspire 5710Z",
432 .matches = {
433 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
434 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
435 },
436 },
437 {
438 .callback = video_set_bqc_offset,
439 .ident = "eMachines E510",
440 .matches = {
441 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
442 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
443 },
444 },
445 {
446 .callback = video_set_bqc_offset,
447 .ident = "Acer Aspire 5315",
448 .matches = {
449 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
450 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
451 },
452 },
453 {
454 .callback = video_set_bqc_offset,
455 .ident = "Acer Aspire 7720",
456 .matches = {
457 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
458 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
459 },
460 },
461
462 /*
463 * Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set
464 * but the IDs actually follow the Device ID Scheme.
465 */
466 {
467 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
468 .callback = video_set_device_id_scheme,
469 .ident = "ESPRIMO Mobile M9410",
470 .matches = {
471 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
472 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
473 },
474 },
475 /*
476 * Some machines have multiple video output devices, but only the one
477 * that is the type of LCD can do the backlight control so we should not
478 * register backlight interface for other video output devices.
479 */
480 {
481 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
482 .callback = video_enable_only_lcd,
483 .ident = "ESPRIMO Mobile M9410",
484 .matches = {
485 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
486 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
487 },
488 },
489 /*
490 * Some machines report wrong key events on the acpi-bus, suppress
491 * key event reporting on these. Note this is only intended to work
492 * around events which are plain wrong. In some cases we get double
493 * events, in this case acpi-video is considered the canonical source
494 * and the events from the other source should be filtered. E.g.
495 * by calling acpi_video_handles_brightness_key_presses() from the
496 * vendor acpi/wmi driver or by using /lib/udev/hwdb.d/60-keyboard.hwdb
497 */
498 {
499 .callback = video_set_report_key_events,
500 .driver_data = (void *)((uintptr_t)REPORT_OUTPUT_KEY_EVENTS),
501 .ident = "Dell Vostro V131",
502 .matches = {
503 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
504 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
505 },
506 },
507 {
508 .callback = video_set_report_key_events,
509 .driver_data = (void *)((uintptr_t)REPORT_BRIGHTNESS_KEY_EVENTS),
510 .ident = "Dell Vostro 3350",
511 .matches = {
512 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
513 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3350"),
514 },
515 },
516 /*
517 * Some machines change the brightness themselves when a brightness
518 * hotkey gets pressed, despite us telling them not to. In this case
519 * acpi_video_device_notify() should only call backlight_force_update(
520 * BACKLIGHT_UPDATE_HOTKEY) and not do anything else.
521 */
522 {
523 /* https://bugzilla.kernel.org/show_bug.cgi?id=204077 */
524 .callback = video_hw_changes_brightness,
525 .ident = "Packard Bell EasyNote MZ35",
526 .matches = {
527 DMI_MATCH(DMI_SYS_VENDOR, "Packard Bell"),
528 DMI_MATCH(DMI_PRODUCT_NAME, "EasyNote MZ35"),
529 },
530 },
531 {}
532};
533
534static unsigned long long
535acpi_video_bqc_value_to_level(struct acpi_video_device *device,
536 unsigned long long bqc_value)
537{
538 unsigned long long level;
539
540 if (device->brightness->flags._BQC_use_index) {
541 /*
542 * _BQC returns an index that doesn't account for the first 2
543 * items with special meaning (see enum acpi_video_level_idx),
544 * so we need to compensate for that by offsetting ourselves
545 */
546 if (device->brightness->flags._BCL_reversed)
547 bqc_value = device->brightness->count -
548 ACPI_VIDEO_FIRST_LEVEL - 1 - bqc_value;
549
550 level = device->brightness->levels[bqc_value +
551 ACPI_VIDEO_FIRST_LEVEL];
552 } else {
553 level = bqc_value;
554 }
555
556 level += bqc_offset_aml_bug_workaround;
557
558 return level;
559}
560
561static int
562acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
563 unsigned long long *level, bool raw)
564{
565 acpi_status status = AE_OK;
566 int i;
567
568 if (device->cap._BQC || device->cap._BCQ) {
569 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
570
571 status = acpi_evaluate_integer(device->dev->handle, buf,
572 NULL, level);
573 if (ACPI_SUCCESS(status)) {
574 if (raw) {
575 /*
576 * Caller has indicated he wants the raw
577 * value returned by _BQC, so don't furtherly
578 * mess with the value.
579 */
580 return 0;
581 }
582
583 *level = acpi_video_bqc_value_to_level(device, *level);
584
585 for (i = ACPI_VIDEO_FIRST_LEVEL;
586 i < device->brightness->count; i++)
587 if (device->brightness->levels[i] == *level) {
588 device->brightness->curr = *level;
589 return 0;
590 }
591 /*
592 * BQC returned an invalid level.
593 * Stop using it.
594 */
595 acpi_handle_info(device->dev->handle,
596 "%s returned an invalid level", buf);
597 device->cap._BQC = device->cap._BCQ = 0;
598 } else {
599 /*
600 * Fixme:
601 * should we return an error or ignore this failure?
602 * dev->brightness->curr is a cached value which stores
603 * the correct current backlight level in most cases.
604 * ACPI video backlight still works w/ buggy _BQC.
605 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
606 */
607 acpi_handle_info(device->dev->handle,
608 "%s evaluation failed", buf);
609 device->cap._BQC = device->cap._BCQ = 0;
610 }
611 }
612
613 *level = device->brightness->curr;
614 return 0;
615}
616
617static int
618acpi_video_device_EDID(struct acpi_video_device *device,
619 union acpi_object **edid, ssize_t length)
620{
621 int status;
622 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
623 union acpi_object *obj;
624 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
625 struct acpi_object_list args = { 1, &arg0 };
626
627
628 *edid = NULL;
629
630 if (!device)
631 return -ENODEV;
632 if (length == 128)
633 arg0.integer.value = 1;
634 else if (length == 256)
635 arg0.integer.value = 2;
636 else
637 return -EINVAL;
638
639 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
640 if (ACPI_FAILURE(status))
641 return -ENODEV;
642
643 obj = buffer.pointer;
644
645 if (obj && obj->type == ACPI_TYPE_BUFFER)
646 *edid = obj;
647 else {
648 acpi_handle_info(device->dev->handle, "Invalid _DDC data\n");
649 status = -EFAULT;
650 kfree(obj);
651 }
652
653 return status;
654}
655
656/* bus */
657
658/*
659 * Arg:
660 * video : video bus device pointer
661 * bios_flag :
662 * 0. The system BIOS should NOT automatically switch(toggle)
663 * the active display output.
664 * 1. The system BIOS should automatically switch (toggle) the
665 * active display output. No switch event.
666 * 2. The _DGS value should be locked.
667 * 3. The system BIOS should not automatically switch (toggle) the
668 * active display output, but instead generate the display switch
669 * event notify code.
670 * lcd_flag :
671 * 0. The system BIOS should automatically control the brightness level
672 * of the LCD when:
673 * - the power changes from AC to DC (ACPI appendix B)
674 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs)
675 * 1. The system BIOS should NOT automatically control the brightness
676 * level of the LCD when:
677 * - the power changes from AC to DC (ACPI appendix B)
678 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs)
679 * Return Value:
680 * -EINVAL wrong arg.
681 */
682
683static int
684acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
685{
686 acpi_status status;
687
688 if (!video->cap._DOS)
689 return 0;
690
691 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
692 return -EINVAL;
693 video->dos_setting = (lcd_flag << 2) | bios_flag;
694 status = acpi_execute_simple_method(video->device->handle, "_DOS",
695 (lcd_flag << 2) | bios_flag);
696 if (ACPI_FAILURE(status))
697 return -EIO;
698
699 return 0;
700}
701
702/*
703 * Simple comparison function used to sort backlight levels.
704 */
705
706static int
707acpi_video_cmp_level(const void *a, const void *b)
708{
709 return *(int *)a - *(int *)b;
710}
711
712/*
713 * Decides if _BQC/_BCQ for this system is usable
714 *
715 * We do this by changing the level first and then read out the current
716 * brightness level, if the value does not match, find out if it is using
717 * index. If not, clear the _BQC/_BCQ capability.
718 */
719static int acpi_video_bqc_quirk(struct acpi_video_device *device,
720 int max_level, int current_level)
721{
722 struct acpi_video_device_brightness *br = device->brightness;
723 int result;
724 unsigned long long level;
725 int test_level;
726
727 /* don't mess with existing known broken systems */
728 if (bqc_offset_aml_bug_workaround)
729 return 0;
730
731 /*
732 * Some systems always report current brightness level as maximum
733 * through _BQC, we need to test another value for them. However,
734 * there is a subtlety:
735 *
736 * If the _BCL package ordering is descending, the first level
737 * (br->levels[2]) is likely to be 0, and if the number of levels
738 * matches the number of steps, we might confuse a returned level to
739 * mean the index.
740 *
741 * For example:
742 *
743 * current_level = max_level = 100
744 * test_level = 0
745 * returned level = 100
746 *
747 * In this case 100 means the level, not the index, and _BCM failed.
748 * Still, if the _BCL package ordering is descending, the index of
749 * level 0 is also 100, so we assume _BQC is indexed, when it's not.
750 *
751 * This causes all _BQC calls to return bogus values causing weird
752 * behavior from the user's perspective. For example:
753 *
754 * xbacklight -set 10; xbacklight -set 20;
755 *
756 * would flash to 90% and then slowly down to the desired level (20).
757 *
758 * The solution is simple; test anything other than the first level
759 * (e.g. 1).
760 */
761 test_level = current_level == max_level
762 ? br->levels[ACPI_VIDEO_FIRST_LEVEL + 1]
763 : max_level;
764
765 result = acpi_video_device_lcd_set_level(device, test_level);
766 if (result)
767 return result;
768
769 result = acpi_video_device_lcd_get_level_current(device, &level, true);
770 if (result)
771 return result;
772
773 if (level != test_level) {
774 /* buggy _BQC found, need to find out if it uses index */
775 if (level < br->count) {
776 if (br->flags._BCL_reversed)
777 level = br->count - ACPI_VIDEO_FIRST_LEVEL - 1 - level;
778 if (br->levels[level + ACPI_VIDEO_FIRST_LEVEL] == test_level)
779 br->flags._BQC_use_index = 1;
780 }
781
782 if (!br->flags._BQC_use_index)
783 device->cap._BQC = device->cap._BCQ = 0;
784 }
785
786 return 0;
787}
788
789int acpi_video_get_levels(struct acpi_device *device,
790 struct acpi_video_device_brightness **dev_br,
791 int *pmax_level)
792{
793 union acpi_object *obj = NULL;
794 int i, max_level = 0, count = 0, level_ac_battery = 0;
795 union acpi_object *o;
796 struct acpi_video_device_brightness *br = NULL;
797 int result = 0;
798 u32 value;
799
800 if (ACPI_FAILURE(acpi_video_device_lcd_query_levels(device->handle, &obj))) {
801 acpi_handle_debug(device->handle,
802 "Could not query available LCD brightness level\n");
803 result = -ENODEV;
804 goto out;
805 }
806
807 if (obj->package.count < ACPI_VIDEO_FIRST_LEVEL) {
808 result = -EINVAL;
809 goto out;
810 }
811
812 br = kzalloc(sizeof(*br), GFP_KERNEL);
813 if (!br) {
814 result = -ENOMEM;
815 goto out;
816 }
817
818 /*
819 * Note that we have to reserve 2 extra items (ACPI_VIDEO_FIRST_LEVEL),
820 * in order to account for buggy BIOS which don't export the first two
821 * special levels (see below)
822 */
823 br->levels = kmalloc_array(obj->package.count + ACPI_VIDEO_FIRST_LEVEL,
824 sizeof(*br->levels),
825 GFP_KERNEL);
826 if (!br->levels) {
827 result = -ENOMEM;
828 goto out_free;
829 }
830
831 for (i = 0; i < obj->package.count; i++) {
832 o = (union acpi_object *)&obj->package.elements[i];
833 if (o->type != ACPI_TYPE_INTEGER) {
834 acpi_handle_info(device->handle, "Invalid data\n");
835 continue;
836 }
837 value = (u32) o->integer.value;
838 /* Skip duplicate entries */
839 if (count > ACPI_VIDEO_FIRST_LEVEL
840 && br->levels[count - 1] == value)
841 continue;
842
843 br->levels[count] = value;
844
845 if (br->levels[count] > max_level)
846 max_level = br->levels[count];
847 count++;
848 }
849
850 /*
851 * some buggy BIOS don't export the levels
852 * when machine is on AC/Battery in _BCL package.
853 * In this case, the first two elements in _BCL packages
854 * are also supported brightness levels that OS should take care of.
855 */
856 for (i = ACPI_VIDEO_FIRST_LEVEL; i < count; i++) {
857 if (br->levels[i] == br->levels[ACPI_VIDEO_AC_LEVEL])
858 level_ac_battery++;
859 if (br->levels[i] == br->levels[ACPI_VIDEO_BATTERY_LEVEL])
860 level_ac_battery++;
861 }
862
863 if (level_ac_battery < ACPI_VIDEO_FIRST_LEVEL) {
864 level_ac_battery = ACPI_VIDEO_FIRST_LEVEL - level_ac_battery;
865 br->flags._BCL_no_ac_battery_levels = 1;
866 for (i = (count - 1 + level_ac_battery);
867 i >= ACPI_VIDEO_FIRST_LEVEL; i--)
868 br->levels[i] = br->levels[i - level_ac_battery];
869 count += level_ac_battery;
870 } else if (level_ac_battery > ACPI_VIDEO_FIRST_LEVEL)
871 acpi_handle_info(device->handle,
872 "Too many duplicates in _BCL package");
873
874 /* Check if the _BCL package is in a reversed order */
875 if (max_level == br->levels[ACPI_VIDEO_FIRST_LEVEL]) {
876 br->flags._BCL_reversed = 1;
877 sort(&br->levels[ACPI_VIDEO_FIRST_LEVEL],
878 count - ACPI_VIDEO_FIRST_LEVEL,
879 sizeof(br->levels[ACPI_VIDEO_FIRST_LEVEL]),
880 acpi_video_cmp_level, NULL);
881 } else if (max_level != br->levels[count - 1])
882 acpi_handle_info(device->handle,
883 "Found unordered _BCL package");
884
885 br->count = count;
886 *dev_br = br;
887 if (pmax_level)
888 *pmax_level = max_level;
889
890out:
891 kfree(obj);
892 return result;
893out_free:
894 kfree(br);
895 goto out;
896}
897EXPORT_SYMBOL(acpi_video_get_levels);
898
899/*
900 * Arg:
901 * device : video output device (LCD, CRT, ..)
902 *
903 * Return Value:
904 * Maximum brightness level
905 *
906 * Allocate and initialize device->brightness.
907 */
908
909static int
910acpi_video_init_brightness(struct acpi_video_device *device)
911{
912 int i, max_level = 0;
913 unsigned long long level, level_old;
914 struct acpi_video_device_brightness *br = NULL;
915 int result;
916
917 result = acpi_video_get_levels(device->dev, &br, &max_level);
918 if (result)
919 return result;
920 device->brightness = br;
921
922 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
923 br->curr = level = max_level;
924
925 if (!device->cap._BQC)
926 goto set_level;
927
928 result = acpi_video_device_lcd_get_level_current(device,
929 &level_old, true);
930 if (result)
931 goto out_free_levels;
932
933 result = acpi_video_bqc_quirk(device, max_level, level_old);
934 if (result)
935 goto out_free_levels;
936 /*
937 * cap._BQC may get cleared due to _BQC is found to be broken
938 * in acpi_video_bqc_quirk, so check again here.
939 */
940 if (!device->cap._BQC)
941 goto set_level;
942
943 level = acpi_video_bqc_value_to_level(device, level_old);
944 /*
945 * On some buggy laptops, _BQC returns an uninitialized
946 * value when invoked for the first time, i.e.
947 * level_old is invalid (no matter whether it's a level
948 * or an index). Set the backlight to max_level in this case.
949 */
950 for (i = ACPI_VIDEO_FIRST_LEVEL; i < br->count; i++)
951 if (level == br->levels[i])
952 break;
953 if (i == br->count || !level)
954 level = max_level;
955
956set_level:
957 result = acpi_video_device_lcd_set_level(device, level);
958 if (result)
959 goto out_free_levels;
960
961 acpi_handle_debug(device->dev->handle, "found %d brightness levels\n",
962 br->count - ACPI_VIDEO_FIRST_LEVEL);
963
964 return 0;
965
966out_free_levels:
967 kfree(br->levels);
968 kfree(br);
969 device->brightness = NULL;
970 return result;
971}
972
973/*
974 * Arg:
975 * device : video output device (LCD, CRT, ..)
976 *
977 * Return Value:
978 * None
979 *
980 * Find out all required AML methods defined under the output
981 * device.
982 */
983
984static void acpi_video_device_find_cap(struct acpi_video_device *device)
985{
986 if (acpi_has_method(device->dev->handle, "_ADR"))
987 device->cap._ADR = 1;
988 if (acpi_has_method(device->dev->handle, "_BCL"))
989 device->cap._BCL = 1;
990 if (acpi_has_method(device->dev->handle, "_BCM"))
991 device->cap._BCM = 1;
992 if (acpi_has_method(device->dev->handle, "_BQC")) {
993 device->cap._BQC = 1;
994 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
995 acpi_handle_info(device->dev->handle,
996 "_BCQ is used instead of _BQC\n");
997 device->cap._BCQ = 1;
998 }
999
1000 if (acpi_has_method(device->dev->handle, "_DDC"))
1001 device->cap._DDC = 1;
1002}
1003
1004/*
1005 * Arg:
1006 * device : video output device (VGA)
1007 *
1008 * Return Value:
1009 * None
1010 *
1011 * Find out all required AML methods defined under the video bus device.
1012 */
1013
1014static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1015{
1016 if (acpi_has_method(video->device->handle, "_DOS"))
1017 video->cap._DOS = 1;
1018 if (acpi_has_method(video->device->handle, "_DOD"))
1019 video->cap._DOD = 1;
1020 if (acpi_has_method(video->device->handle, "_ROM"))
1021 video->cap._ROM = 1;
1022 if (acpi_has_method(video->device->handle, "_GPD"))
1023 video->cap._GPD = 1;
1024 if (acpi_has_method(video->device->handle, "_SPD"))
1025 video->cap._SPD = 1;
1026 if (acpi_has_method(video->device->handle, "_VPO"))
1027 video->cap._VPO = 1;
1028}
1029
1030/*
1031 * Check whether the video bus device has required AML method to
1032 * support the desired features
1033 */
1034
1035static int acpi_video_bus_check(struct acpi_video_bus *video)
1036{
1037 acpi_status status = -ENOENT;
1038 struct pci_dev *dev;
1039
1040 if (!video)
1041 return -EINVAL;
1042
1043 dev = acpi_get_pci_dev(video->device->handle);
1044 if (!dev)
1045 return -ENODEV;
1046 pci_dev_put(dev);
1047
1048 /*
1049 * Since there is no HID, CID and so on for VGA driver, we have
1050 * to check well known required nodes.
1051 */
1052
1053 /* Does this device support video switching? */
1054 if (video->cap._DOS || video->cap._DOD) {
1055 if (!video->cap._DOS) {
1056 pr_info(FW_BUG "ACPI(%s) defines _DOD but not _DOS\n",
1057 acpi_device_bid(video->device));
1058 }
1059 video->flags.multihead = 1;
1060 status = 0;
1061 }
1062
1063 /* Does this device support retrieving a video ROM? */
1064 if (video->cap._ROM) {
1065 video->flags.rom = 1;
1066 status = 0;
1067 }
1068
1069 /* Does this device support configuring which video device to POST? */
1070 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1071 video->flags.post = 1;
1072 status = 0;
1073 }
1074
1075 return status;
1076}
1077
1078/*
1079 * --------------------------------------------------------------------------
1080 * Driver Interface
1081 * --------------------------------------------------------------------------
1082 */
1083
1084/* device interface */
1085static struct acpi_video_device_attrib *
1086acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1087{
1088 struct acpi_video_enumerated_device *ids;
1089 int i;
1090
1091 for (i = 0; i < video->attached_count; i++) {
1092 ids = &video->attached_array[i];
1093 if ((ids->value.int_val & 0xffff) == device_id)
1094 return &ids->value.attrib;
1095 }
1096
1097 return NULL;
1098}
1099
1100static int
1101acpi_video_get_device_type(struct acpi_video_bus *video,
1102 unsigned long device_id)
1103{
1104 struct acpi_video_enumerated_device *ids;
1105 int i;
1106
1107 for (i = 0; i < video->attached_count; i++) {
1108 ids = &video->attached_array[i];
1109 if ((ids->value.int_val & 0xffff) == device_id)
1110 return ids->value.int_val;
1111 }
1112
1113 return 0;
1114}
1115
1116static int acpi_video_bus_get_one_device(struct acpi_device *device, void *arg)
1117{
1118 struct acpi_video_bus *video = arg;
1119 struct acpi_video_device_attrib *attribute;
1120 struct acpi_video_device *data;
1121 unsigned long long device_id;
1122 acpi_status status;
1123 int device_type;
1124
1125 status = acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1126 /* Skip devices without _ADR instead of failing. */
1127 if (ACPI_FAILURE(status))
1128 goto exit;
1129
1130 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1131 if (!data) {
1132 dev_dbg(&device->dev, "Cannot attach\n");
1133 return -ENOMEM;
1134 }
1135
1136 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1137 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1138 device->driver_data = data;
1139
1140 data->device_id = device_id;
1141 data->video = video;
1142 data->dev = device;
1143 INIT_DELAYED_WORK(&data->switch_brightness_work,
1144 acpi_video_switch_brightness);
1145
1146 attribute = acpi_video_get_device_attr(video, device_id);
1147
1148 if (attribute && (attribute->device_id_scheme || device_id_scheme)) {
1149 switch (attribute->display_type) {
1150 case ACPI_VIDEO_DISPLAY_CRT:
1151 data->flags.crt = 1;
1152 break;
1153 case ACPI_VIDEO_DISPLAY_TV:
1154 data->flags.tvout = 1;
1155 break;
1156 case ACPI_VIDEO_DISPLAY_DVI:
1157 data->flags.dvi = 1;
1158 break;
1159 case ACPI_VIDEO_DISPLAY_LCD:
1160 data->flags.lcd = 1;
1161 break;
1162 default:
1163 data->flags.unknown = 1;
1164 break;
1165 }
1166 if (attribute->bios_can_detect)
1167 data->flags.bios = 1;
1168 } else {
1169 /* Check for legacy IDs */
1170 device_type = acpi_video_get_device_type(video, device_id);
1171 /* Ignore bits 16 and 18-20 */
1172 switch (device_type & 0xffe2ffff) {
1173 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1174 data->flags.crt = 1;
1175 break;
1176 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1177 data->flags.lcd = 1;
1178 break;
1179 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1180 data->flags.tvout = 1;
1181 break;
1182 default:
1183 data->flags.unknown = 1;
1184 }
1185 }
1186
1187 acpi_video_device_bind(video, data);
1188 acpi_video_device_find_cap(data);
1189
1190 if (data->cap._BCM && data->cap._BCL)
1191 may_report_brightness_keys = true;
1192
1193 mutex_lock(&video->device_list_lock);
1194 list_add_tail(&data->entry, &video->video_device_list);
1195 mutex_unlock(&video->device_list_lock);
1196
1197exit:
1198 video->child_count++;
1199 return 0;
1200}
1201
1202/*
1203 * Arg:
1204 * video : video bus device
1205 *
1206 * Return:
1207 * none
1208 *
1209 * Enumerate the video device list of the video bus,
1210 * bind the ids with the corresponding video devices
1211 * under the video bus.
1212 */
1213
1214static void acpi_video_device_rebind(struct acpi_video_bus *video)
1215{
1216 struct acpi_video_device *dev;
1217
1218 mutex_lock(&video->device_list_lock);
1219
1220 list_for_each_entry(dev, &video->video_device_list, entry)
1221 acpi_video_device_bind(video, dev);
1222
1223 mutex_unlock(&video->device_list_lock);
1224}
1225
1226/*
1227 * Arg:
1228 * video : video bus device
1229 * device : video output device under the video
1230 * bus
1231 *
1232 * Return:
1233 * none
1234 *
1235 * Bind the ids with the corresponding video devices
1236 * under the video bus.
1237 */
1238
1239static void
1240acpi_video_device_bind(struct acpi_video_bus *video,
1241 struct acpi_video_device *device)
1242{
1243 struct acpi_video_enumerated_device *ids;
1244 int i;
1245
1246 for (i = 0; i < video->attached_count; i++) {
1247 ids = &video->attached_array[i];
1248 if (device->device_id == (ids->value.int_val & 0xffff)) {
1249 ids->bind_info = device;
1250 acpi_handle_debug(video->device->handle, "%s: %d\n",
1251 __func__, i);
1252 }
1253 }
1254}
1255
1256static bool acpi_video_device_in_dod(struct acpi_video_device *device)
1257{
1258 struct acpi_video_bus *video = device->video;
1259 int i;
1260
1261 /*
1262 * If we have a broken _DOD or we have more than 8 output devices
1263 * under the graphics controller node that we can't proper deal with
1264 * in the operation region code currently, no need to test.
1265 */
1266 if (!video->attached_count || video->child_count > 8)
1267 return true;
1268
1269 for (i = 0; i < video->attached_count; i++) {
1270 if ((video->attached_array[i].value.int_val & 0xfff) ==
1271 (device->device_id & 0xfff))
1272 return true;
1273 }
1274
1275 return false;
1276}
1277
1278/*
1279 * Arg:
1280 * video : video bus device
1281 *
1282 * Return:
1283 * < 0 : error
1284 *
1285 * Call _DOD to enumerate all devices attached to display adapter
1286 *
1287 */
1288
1289static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1290{
1291 int status;
1292 int count;
1293 int i;
1294 struct acpi_video_enumerated_device *active_list;
1295 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1296 union acpi_object *dod = NULL;
1297 union acpi_object *obj;
1298
1299 if (!video->cap._DOD)
1300 return AE_NOT_EXIST;
1301
1302 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1303 if (ACPI_FAILURE(status)) {
1304 acpi_handle_info(video->device->handle,
1305 "_DOD evaluation failed: %s\n",
1306 acpi_format_exception(status));
1307 return status;
1308 }
1309
1310 dod = buffer.pointer;
1311 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1312 acpi_handle_info(video->device->handle, "Invalid _DOD data\n");
1313 status = -EFAULT;
1314 goto out;
1315 }
1316
1317 acpi_handle_debug(video->device->handle, "Found %d video heads in _DOD\n",
1318 dod->package.count);
1319
1320 active_list = kcalloc(1 + dod->package.count,
1321 sizeof(struct acpi_video_enumerated_device),
1322 GFP_KERNEL);
1323 if (!active_list) {
1324 status = -ENOMEM;
1325 goto out;
1326 }
1327
1328 count = 0;
1329 for (i = 0; i < dod->package.count; i++) {
1330 obj = &dod->package.elements[i];
1331
1332 if (obj->type != ACPI_TYPE_INTEGER) {
1333 acpi_handle_info(video->device->handle,
1334 "Invalid _DOD data in element %d\n", i);
1335 continue;
1336 }
1337
1338 active_list[count].value.int_val = obj->integer.value;
1339 active_list[count].bind_info = NULL;
1340
1341 acpi_handle_debug(video->device->handle,
1342 "_DOD element[%d] = %d\n", i,
1343 (int)obj->integer.value);
1344
1345 count++;
1346 }
1347
1348 kfree(video->attached_array);
1349
1350 video->attached_array = active_list;
1351 video->attached_count = count;
1352
1353out:
1354 kfree(buffer.pointer);
1355 return status;
1356}
1357
1358static int
1359acpi_video_get_next_level(struct acpi_video_device *device,
1360 u32 level_current, u32 event)
1361{
1362 int min, max, min_above, max_below, i, l, delta = 255;
1363 max = max_below = 0;
1364 min = min_above = 255;
1365 /* Find closest level to level_current */
1366 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) {
1367 l = device->brightness->levels[i];
1368 if (abs(l - level_current) < abs(delta)) {
1369 delta = l - level_current;
1370 if (!delta)
1371 break;
1372 }
1373 }
1374 /* Adjust level_current to closest available level */
1375 level_current += delta;
1376 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) {
1377 l = device->brightness->levels[i];
1378 if (l < min)
1379 min = l;
1380 if (l > max)
1381 max = l;
1382 if (l < min_above && l > level_current)
1383 min_above = l;
1384 if (l > max_below && l < level_current)
1385 max_below = l;
1386 }
1387
1388 switch (event) {
1389 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1390 return (level_current < max) ? min_above : min;
1391 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1392 return (level_current < max) ? min_above : max;
1393 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1394 return (level_current > min) ? max_below : min;
1395 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1396 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1397 return 0;
1398 default:
1399 return level_current;
1400 }
1401}
1402
1403static void
1404acpi_video_switch_brightness(struct work_struct *work)
1405{
1406 struct acpi_video_device *device = container_of(to_delayed_work(work),
1407 struct acpi_video_device, switch_brightness_work);
1408 unsigned long long level_current, level_next;
1409 int event = device->switch_brightness_event;
1410 int result = -EINVAL;
1411
1412 /* no warning message if acpi_backlight=vendor or a quirk is used */
1413 if (!device->backlight)
1414 return;
1415
1416 if (!device->brightness)
1417 goto out;
1418
1419 result = acpi_video_device_lcd_get_level_current(device,
1420 &level_current,
1421 false);
1422 if (result)
1423 goto out;
1424
1425 level_next = acpi_video_get_next_level(device, level_current, event);
1426
1427 result = acpi_video_device_lcd_set_level(device, level_next);
1428
1429 if (!result)
1430 backlight_force_update(device->backlight,
1431 BACKLIGHT_UPDATE_HOTKEY);
1432
1433out:
1434 if (result)
1435 acpi_handle_info(device->dev->handle,
1436 "Failed to switch brightness\n");
1437}
1438
1439int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1440 void **edid)
1441{
1442 struct acpi_video_bus *video;
1443 struct acpi_video_device *video_device;
1444 union acpi_object *buffer = NULL;
1445 acpi_status status;
1446 int i, length;
1447
1448 if (!device || !acpi_driver_data(device))
1449 return -EINVAL;
1450
1451 video = acpi_driver_data(device);
1452
1453 for (i = 0; i < video->attached_count; i++) {
1454 video_device = video->attached_array[i].bind_info;
1455 length = 256;
1456
1457 if (!video_device)
1458 continue;
1459
1460 if (!video_device->cap._DDC)
1461 continue;
1462
1463 if (type) {
1464 switch (type) {
1465 case ACPI_VIDEO_DISPLAY_CRT:
1466 if (!video_device->flags.crt)
1467 continue;
1468 break;
1469 case ACPI_VIDEO_DISPLAY_TV:
1470 if (!video_device->flags.tvout)
1471 continue;
1472 break;
1473 case ACPI_VIDEO_DISPLAY_DVI:
1474 if (!video_device->flags.dvi)
1475 continue;
1476 break;
1477 case ACPI_VIDEO_DISPLAY_LCD:
1478 if (!video_device->flags.lcd)
1479 continue;
1480 break;
1481 }
1482 } else if (video_device->device_id != device_id) {
1483 continue;
1484 }
1485
1486 status = acpi_video_device_EDID(video_device, &buffer, length);
1487
1488 if (ACPI_FAILURE(status) || !buffer ||
1489 buffer->type != ACPI_TYPE_BUFFER) {
1490 length = 128;
1491 status = acpi_video_device_EDID(video_device, &buffer,
1492 length);
1493 if (ACPI_FAILURE(status) || !buffer ||
1494 buffer->type != ACPI_TYPE_BUFFER) {
1495 continue;
1496 }
1497 }
1498
1499 *edid = buffer->buffer.pointer;
1500 return length;
1501 }
1502
1503 return -ENODEV;
1504}
1505EXPORT_SYMBOL(acpi_video_get_edid);
1506
1507static int
1508acpi_video_bus_get_devices(struct acpi_video_bus *video,
1509 struct acpi_device *device)
1510{
1511 /*
1512 * There are systems where video module known to work fine regardless
1513 * of broken _DOD and ignoring returned value here doesn't cause
1514 * any issues later.
1515 */
1516 acpi_video_device_enumerate(video);
1517
1518 return acpi_dev_for_each_child(device, acpi_video_bus_get_one_device, video);
1519}
1520
1521/* acpi_video interface */
1522
1523/*
1524 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1525 * perform any automatic brightness change on receiving a notification.
1526 */
1527static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1528{
1529 return acpi_video_bus_DOS(video, 0,
1530 acpi_osi_is_win8() ? 1 : 0);
1531}
1532
1533static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1534{
1535 return acpi_video_bus_DOS(video, 0,
1536 acpi_osi_is_win8() ? 0 : 1);
1537}
1538
1539static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1540{
1541 struct acpi_video_bus *video = acpi_driver_data(device);
1542 struct input_dev *input;
1543 int keycode = 0;
1544
1545 if (!video || !video->input)
1546 return;
1547
1548 input = video->input;
1549
1550 switch (event) {
1551 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1552 * most likely via hotkey. */
1553 keycode = KEY_SWITCHVIDEOMODE;
1554 break;
1555
1556 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1557 * connector. */
1558 acpi_video_device_enumerate(video);
1559 acpi_video_device_rebind(video);
1560 keycode = KEY_SWITCHVIDEOMODE;
1561 break;
1562
1563 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1564 keycode = KEY_SWITCHVIDEOMODE;
1565 break;
1566 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1567 keycode = KEY_VIDEO_NEXT;
1568 break;
1569 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1570 keycode = KEY_VIDEO_PREV;
1571 break;
1572
1573 default:
1574 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n",
1575 event);
1576 break;
1577 }
1578
1579 if (acpi_notifier_call_chain(device, event, 0))
1580 /* Something vetoed the keypress. */
1581 keycode = 0;
1582
1583 if (keycode && (report_key_events & REPORT_OUTPUT_KEY_EVENTS)) {
1584 input_report_key(input, keycode, 1);
1585 input_sync(input);
1586 input_report_key(input, keycode, 0);
1587 input_sync(input);
1588 }
1589}
1590
1591static void brightness_switch_event(struct acpi_video_device *video_device,
1592 u32 event)
1593{
1594 if (!brightness_switch_enabled)
1595 return;
1596
1597 video_device->switch_brightness_event = event;
1598 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10);
1599}
1600
1601static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1602{
1603 struct acpi_video_device *video_device = data;
1604 struct acpi_device *device = NULL;
1605 struct acpi_video_bus *bus;
1606 struct input_dev *input;
1607 int keycode = 0;
1608
1609 if (!video_device)
1610 return;
1611
1612 device = video_device->dev;
1613 bus = video_device->video;
1614 input = bus->input;
1615
1616 if (hw_changes_brightness > 0) {
1617 if (video_device->backlight)
1618 backlight_force_update(video_device->backlight,
1619 BACKLIGHT_UPDATE_HOTKEY);
1620 acpi_notifier_call_chain(device, event, 0);
1621 return;
1622 }
1623
1624 switch (event) {
1625 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1626 brightness_switch_event(video_device, event);
1627 keycode = KEY_BRIGHTNESS_CYCLE;
1628 break;
1629 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1630 brightness_switch_event(video_device, event);
1631 keycode = KEY_BRIGHTNESSUP;
1632 break;
1633 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1634 brightness_switch_event(video_device, event);
1635 keycode = KEY_BRIGHTNESSDOWN;
1636 break;
1637 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1638 brightness_switch_event(video_device, event);
1639 keycode = KEY_BRIGHTNESS_ZERO;
1640 break;
1641 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1642 brightness_switch_event(video_device, event);
1643 keycode = KEY_DISPLAY_OFF;
1644 break;
1645 default:
1646 acpi_handle_debug(handle, "Unsupported event [0x%x]\n", event);
1647 break;
1648 }
1649
1650 if (keycode)
1651 may_report_brightness_keys = true;
1652
1653 acpi_notifier_call_chain(device, event, 0);
1654
1655 if (keycode && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS)) {
1656 input_report_key(input, keycode, 1);
1657 input_sync(input);
1658 input_report_key(input, keycode, 0);
1659 input_sync(input);
1660 }
1661}
1662
1663static int acpi_video_resume(struct notifier_block *nb,
1664 unsigned long val, void *ign)
1665{
1666 struct acpi_video_bus *video;
1667 struct acpi_video_device *video_device;
1668 int i;
1669
1670 switch (val) {
1671 case PM_POST_HIBERNATION:
1672 case PM_POST_SUSPEND:
1673 case PM_POST_RESTORE:
1674 video = container_of(nb, struct acpi_video_bus, pm_nb);
1675
1676 dev_info(&video->device->dev, "Restoring backlight state\n");
1677
1678 for (i = 0; i < video->attached_count; i++) {
1679 video_device = video->attached_array[i].bind_info;
1680 if (video_device && video_device->brightness)
1681 acpi_video_device_lcd_set_level(video_device,
1682 video_device->brightness->curr);
1683 }
1684
1685 return NOTIFY_OK;
1686 }
1687 return NOTIFY_DONE;
1688}
1689
1690static acpi_status
1691acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1692 void **return_value)
1693{
1694 struct acpi_device *device = context;
1695 struct acpi_device *sibling;
1696
1697 if (handle == device->handle)
1698 return AE_CTRL_TERMINATE;
1699
1700 sibling = acpi_fetch_acpi_dev(handle);
1701 if (!sibling)
1702 return AE_OK;
1703
1704 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1705 return AE_ALREADY_EXISTS;
1706
1707 return AE_OK;
1708}
1709
1710static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1711{
1712 struct backlight_properties props;
1713 struct pci_dev *pdev;
1714 acpi_handle acpi_parent;
1715 struct device *parent = NULL;
1716 int result;
1717 static int count;
1718 char *name;
1719
1720 result = acpi_video_init_brightness(device);
1721 if (result)
1722 return;
1723
1724 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1725 if (!name)
1726 return;
1727 count++;
1728
1729 acpi_get_parent(device->dev->handle, &acpi_parent);
1730
1731 pdev = acpi_get_pci_dev(acpi_parent);
1732 if (pdev) {
1733 parent = &pdev->dev;
1734 pci_dev_put(pdev);
1735 }
1736
1737 memset(&props, 0, sizeof(struct backlight_properties));
1738 props.type = BACKLIGHT_FIRMWARE;
1739 props.max_brightness =
1740 device->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1;
1741 device->backlight = backlight_device_register(name,
1742 parent,
1743 device,
1744 &acpi_backlight_ops,
1745 &props);
1746 kfree(name);
1747 if (IS_ERR(device->backlight)) {
1748 device->backlight = NULL;
1749 return;
1750 }
1751
1752 /*
1753 * Save current brightness level in case we have to restore it
1754 * before acpi_video_device_lcd_set_level() is called next time.
1755 */
1756 device->backlight->props.brightness =
1757 acpi_video_get_brightness(device->backlight);
1758
1759 device->cooling_dev = thermal_cooling_device_register("LCD",
1760 device->dev, &video_cooling_ops);
1761 if (IS_ERR(device->cooling_dev)) {
1762 /*
1763 * Set cooling_dev to NULL so we don't crash trying to free it.
1764 * Also, why the hell we are returning early and not attempt to
1765 * register video output if cooling device registration failed?
1766 * -- dtor
1767 */
1768 device->cooling_dev = NULL;
1769 return;
1770 }
1771
1772 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1773 device->cooling_dev->id);
1774 result = sysfs_create_link(&device->dev->dev.kobj,
1775 &device->cooling_dev->device.kobj,
1776 "thermal_cooling");
1777 if (result)
1778 pr_info("sysfs link creation failed\n");
1779
1780 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1781 &device->dev->dev.kobj, "device");
1782 if (result)
1783 pr_info("Reverse sysfs link creation failed\n");
1784}
1785
1786static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video)
1787{
1788 struct acpi_video_device *dev;
1789 union acpi_object *levels;
1790
1791 mutex_lock(&video->device_list_lock);
1792 list_for_each_entry(dev, &video->video_device_list, entry) {
1793 if (!acpi_video_device_lcd_query_levels(dev->dev->handle, &levels))
1794 kfree(levels);
1795 }
1796 mutex_unlock(&video->device_list_lock);
1797}
1798
1799static bool acpi_video_should_register_backlight(struct acpi_video_device *dev)
1800{
1801 /*
1802 * Do not create backlight device for video output
1803 * device that is not in the enumerated list.
1804 */
1805 if (!acpi_video_device_in_dod(dev)) {
1806 dev_dbg(&dev->dev->dev, "not in _DOD list, ignore\n");
1807 return false;
1808 }
1809
1810 if (only_lcd)
1811 return dev->flags.lcd;
1812 return true;
1813}
1814
1815static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1816{
1817 struct acpi_video_device *dev;
1818
1819 if (video->backlight_registered)
1820 return 0;
1821
1822 if (acpi_video_get_backlight_type() != acpi_backlight_video)
1823 return 0;
1824
1825 mutex_lock(&video->device_list_lock);
1826 list_for_each_entry(dev, &video->video_device_list, entry) {
1827 if (acpi_video_should_register_backlight(dev))
1828 acpi_video_dev_register_backlight(dev);
1829 }
1830 mutex_unlock(&video->device_list_lock);
1831
1832 video->backlight_registered = true;
1833
1834 video->pm_nb.notifier_call = acpi_video_resume;
1835 video->pm_nb.priority = 0;
1836 return register_pm_notifier(&video->pm_nb);
1837}
1838
1839static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1840{
1841 if (device->backlight) {
1842 backlight_device_unregister(device->backlight);
1843 device->backlight = NULL;
1844 }
1845 if (device->brightness) {
1846 kfree(device->brightness->levels);
1847 kfree(device->brightness);
1848 device->brightness = NULL;
1849 }
1850 if (device->cooling_dev) {
1851 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1852 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1853 thermal_cooling_device_unregister(device->cooling_dev);
1854 device->cooling_dev = NULL;
1855 }
1856}
1857
1858static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1859{
1860 struct acpi_video_device *dev;
1861 int error;
1862
1863 if (!video->backlight_registered)
1864 return 0;
1865
1866 error = unregister_pm_notifier(&video->pm_nb);
1867
1868 mutex_lock(&video->device_list_lock);
1869 list_for_each_entry(dev, &video->video_device_list, entry)
1870 acpi_video_dev_unregister_backlight(dev);
1871 mutex_unlock(&video->device_list_lock);
1872
1873 video->backlight_registered = false;
1874
1875 return error;
1876}
1877
1878static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1879{
1880 acpi_status status;
1881 struct acpi_device *adev = device->dev;
1882
1883 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1884 acpi_video_device_notify, device);
1885 if (ACPI_FAILURE(status))
1886 dev_err(&adev->dev, "Error installing notify handler\n");
1887 else
1888 device->flags.notify = 1;
1889}
1890
1891static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1892{
1893 struct input_dev *input;
1894 struct acpi_video_device *dev;
1895 int error;
1896
1897 video->input = input = input_allocate_device();
1898 if (!input) {
1899 error = -ENOMEM;
1900 goto out;
1901 }
1902
1903 error = acpi_video_bus_start_devices(video);
1904 if (error)
1905 goto err_free_input;
1906
1907 snprintf(video->phys, sizeof(video->phys),
1908 "%s/video/input0", acpi_device_hid(video->device));
1909
1910 input->name = acpi_device_name(video->device);
1911 input->phys = video->phys;
1912 input->id.bustype = BUS_HOST;
1913 input->id.product = 0x06;
1914 input->dev.parent = &video->device->dev;
1915 input->evbit[0] = BIT(EV_KEY);
1916 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1917 set_bit(KEY_VIDEO_NEXT, input->keybit);
1918 set_bit(KEY_VIDEO_PREV, input->keybit);
1919 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1920 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1921 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1922 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1923 set_bit(KEY_DISPLAY_OFF, input->keybit);
1924
1925 error = input_register_device(input);
1926 if (error)
1927 goto err_stop_dev;
1928
1929 mutex_lock(&video->device_list_lock);
1930 list_for_each_entry(dev, &video->video_device_list, entry)
1931 acpi_video_dev_add_notify_handler(dev);
1932 mutex_unlock(&video->device_list_lock);
1933
1934 return 0;
1935
1936err_stop_dev:
1937 acpi_video_bus_stop_devices(video);
1938err_free_input:
1939 input_free_device(input);
1940 video->input = NULL;
1941out:
1942 return error;
1943}
1944
1945static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1946{
1947 if (dev->flags.notify) {
1948 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1949 acpi_video_device_notify);
1950 dev->flags.notify = 0;
1951 }
1952}
1953
1954static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1955{
1956 struct acpi_video_device *dev;
1957
1958 mutex_lock(&video->device_list_lock);
1959 list_for_each_entry(dev, &video->video_device_list, entry)
1960 acpi_video_dev_remove_notify_handler(dev);
1961 mutex_unlock(&video->device_list_lock);
1962
1963 acpi_video_bus_stop_devices(video);
1964 input_unregister_device(video->input);
1965 video->input = NULL;
1966}
1967
1968static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1969{
1970 struct acpi_video_device *dev, *next;
1971
1972 mutex_lock(&video->device_list_lock);
1973 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1974 list_del(&dev->entry);
1975 kfree(dev);
1976 }
1977 mutex_unlock(&video->device_list_lock);
1978
1979 return 0;
1980}
1981
1982static int instance;
1983
1984static int acpi_video_bus_add(struct acpi_device *device)
1985{
1986 struct acpi_video_bus *video;
1987 int error;
1988 acpi_status status;
1989
1990 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1991 acpi_dev_parent(device)->handle, 1,
1992 acpi_video_bus_match, NULL,
1993 device, NULL);
1994 if (status == AE_ALREADY_EXISTS) {
1995 pr_info(FW_BUG
1996 "Duplicate ACPI video bus devices for the"
1997 " same VGA controller, please try module "
1998 "parameter \"video.allow_duplicates=1\""
1999 "if the current driver doesn't work.\n");
2000 if (!allow_duplicates)
2001 return -ENODEV;
2002 }
2003
2004 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2005 if (!video)
2006 return -ENOMEM;
2007
2008 /* a hack to fix the duplicate name "VID" problem on T61 */
2009 if (!strcmp(device->pnp.bus_id, "VID")) {
2010 if (instance)
2011 device->pnp.bus_id[3] = '0' + instance;
2012 instance++;
2013 }
2014 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2015 if (!strcmp(device->pnp.bus_id, "VGA")) {
2016 if (instance)
2017 device->pnp.bus_id[3] = '0' + instance;
2018 instance++;
2019 }
2020
2021 video->device = device;
2022 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2023 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2024 device->driver_data = video;
2025
2026 acpi_video_bus_find_cap(video);
2027 error = acpi_video_bus_check(video);
2028 if (error)
2029 goto err_free_video;
2030
2031 mutex_init(&video->device_list_lock);
2032 INIT_LIST_HEAD(&video->video_device_list);
2033
2034 error = acpi_video_bus_get_devices(video, device);
2035 if (error)
2036 goto err_put_video;
2037
2038 pr_info("%s [%s] (multi-head: %s rom: %s post: %s)\n",
2039 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2040 video->flags.multihead ? "yes" : "no",
2041 video->flags.rom ? "yes" : "no",
2042 video->flags.post ? "yes" : "no");
2043 mutex_lock(&video_list_lock);
2044 list_add_tail(&video->entry, &video_bus_head);
2045 mutex_unlock(&video_list_lock);
2046
2047 /*
2048 * The userspace visible backlight_device gets registered separately
2049 * from acpi_video_register_backlight().
2050 */
2051 acpi_video_run_bcl_for_osi(video);
2052 acpi_video_bus_add_notify_handler(video);
2053
2054 return 0;
2055
2056err_put_video:
2057 acpi_video_bus_put_devices(video);
2058 kfree(video->attached_array);
2059err_free_video:
2060 kfree(video);
2061 device->driver_data = NULL;
2062
2063 return error;
2064}
2065
2066static void acpi_video_bus_remove(struct acpi_device *device)
2067{
2068 struct acpi_video_bus *video = NULL;
2069
2070
2071 if (!device || !acpi_driver_data(device))
2072 return;
2073
2074 video = acpi_driver_data(device);
2075
2076 mutex_lock(&video_list_lock);
2077 list_del(&video->entry);
2078 mutex_unlock(&video_list_lock);
2079
2080 acpi_video_bus_remove_notify_handler(video);
2081 acpi_video_bus_unregister_backlight(video);
2082 acpi_video_bus_put_devices(video);
2083
2084 kfree(video->attached_array);
2085 kfree(video);
2086}
2087
2088static void acpi_video_bus_register_backlight_work(struct work_struct *ignored)
2089{
2090 acpi_video_register_backlight();
2091}
2092
2093static int __init is_i740(struct pci_dev *dev)
2094{
2095 if (dev->device == 0x00D1)
2096 return 1;
2097 if (dev->device == 0x7000)
2098 return 1;
2099 return 0;
2100}
2101
2102static int __init intel_opregion_present(void)
2103{
2104 int opregion = 0;
2105 struct pci_dev *dev = NULL;
2106 u32 address;
2107
2108 for_each_pci_dev(dev) {
2109 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2110 continue;
2111 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2112 continue;
2113 /* We don't want to poke around undefined i740 registers */
2114 if (is_i740(dev))
2115 continue;
2116 pci_read_config_dword(dev, 0xfc, &address);
2117 if (!address)
2118 continue;
2119 opregion = 1;
2120 }
2121 return opregion;
2122}
2123
2124/* Check if the chassis-type indicates there is no builtin LCD panel */
2125static bool dmi_is_desktop(void)
2126{
2127 const char *chassis_type;
2128 unsigned long type;
2129
2130 chassis_type = dmi_get_system_info(DMI_CHASSIS_TYPE);
2131 if (!chassis_type)
2132 return false;
2133
2134 if (kstrtoul(chassis_type, 10, &type) != 0)
2135 return false;
2136
2137 switch (type) {
2138 case 0x03: /* Desktop */
2139 case 0x04: /* Low Profile Desktop */
2140 case 0x05: /* Pizza Box */
2141 case 0x06: /* Mini Tower */
2142 case 0x07: /* Tower */
2143 case 0x10: /* Lunch Box */
2144 case 0x11: /* Main Server Chassis */
2145 return true;
2146 }
2147
2148 return false;
2149}
2150
2151/*
2152 * We're seeing a lot of bogus backlight interfaces on newer machines
2153 * without a LCD such as desktops, servers and HDMI sticks. Checking the
2154 * lcd flag fixes this, enable this by default on any machines which are:
2155 * 1. Win8 ready (where we also prefer the native backlight driver, so
2156 * normally the acpi_video code should not register there anyways); *and*
2157 * 2.1 Report a desktop/server DMI chassis-type, or
2158 * 2.2 Are an ACPI-reduced-hardware platform (and thus won't use the EC for
2159 backlight control)
2160 */
2161static bool should_check_lcd_flag(void)
2162{
2163 if (!acpi_osi_is_win8())
2164 return false;
2165
2166 if (dmi_is_desktop())
2167 return true;
2168
2169 if (acpi_reduced_hardware())
2170 return true;
2171
2172 return false;
2173}
2174
2175/*
2176 * At least one graphics driver has reported that no LCD is connected
2177 * via the native interface. cancel the registration for fallback acpi_video0.
2178 * If another driver still deems this necessary, it can explicitly register it.
2179 */
2180void acpi_video_report_nolcd(void)
2181{
2182 cancel_delayed_work(&video_bus_register_backlight_work);
2183}
2184EXPORT_SYMBOL(acpi_video_report_nolcd);
2185
2186int acpi_video_register(void)
2187{
2188 int ret = 0;
2189
2190 mutex_lock(®ister_count_mutex);
2191 if (register_count) {
2192 /*
2193 * if the function of acpi_video_register is already called,
2194 * don't register the acpi_video_bus again and return no error.
2195 */
2196 goto leave;
2197 }
2198
2199 if (only_lcd == -1)
2200 only_lcd = should_check_lcd_flag();
2201
2202 dmi_check_system(video_dmi_table);
2203
2204 ret = acpi_bus_register_driver(&acpi_video_bus);
2205 if (ret)
2206 goto leave;
2207
2208 /*
2209 * When the acpi_video_bus is loaded successfully, increase
2210 * the counter reference.
2211 */
2212 register_count = 1;
2213
2214 /*
2215 * acpi_video_bus_add() skips registering the userspace visible
2216 * backlight_device. The intend is for this to be registered by the
2217 * drm/kms driver calling acpi_video_register_backlight() *after* it is
2218 * done setting up its own native backlight device. The delayed work
2219 * ensures that acpi_video_register_backlight() always gets called
2220 * eventually, in case there is no drm/kms driver or it is disabled.
2221 */
2222 if (register_backlight_delay)
2223 schedule_delayed_work(&video_bus_register_backlight_work,
2224 register_backlight_delay * HZ);
2225
2226leave:
2227 mutex_unlock(®ister_count_mutex);
2228 return ret;
2229}
2230EXPORT_SYMBOL(acpi_video_register);
2231
2232void acpi_video_unregister(void)
2233{
2234 mutex_lock(®ister_count_mutex);
2235 if (register_count) {
2236 cancel_delayed_work_sync(&video_bus_register_backlight_work);
2237 acpi_bus_unregister_driver(&acpi_video_bus);
2238 register_count = 0;
2239 may_report_brightness_keys = false;
2240 }
2241 mutex_unlock(®ister_count_mutex);
2242}
2243EXPORT_SYMBOL(acpi_video_unregister);
2244
2245void acpi_video_register_backlight(void)
2246{
2247 struct acpi_video_bus *video;
2248
2249 mutex_lock(&video_list_lock);
2250 list_for_each_entry(video, &video_bus_head, entry)
2251 acpi_video_bus_register_backlight(video);
2252 mutex_unlock(&video_list_lock);
2253}
2254EXPORT_SYMBOL(acpi_video_register_backlight);
2255
2256bool acpi_video_handles_brightness_key_presses(void)
2257{
2258 return may_report_brightness_keys &&
2259 (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS);
2260}
2261EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses);
2262
2263/*
2264 * This is kind of nasty. Hardware using Intel chipsets may require
2265 * the video opregion code to be run first in order to initialise
2266 * state before any ACPI video calls are made. To handle this we defer
2267 * registration of the video class until the opregion code has run.
2268 */
2269
2270static int __init acpi_video_init(void)
2271{
2272 /*
2273 * Let the module load even if ACPI is disabled (e.g. due to
2274 * a broken BIOS) so that i915.ko can still be loaded on such
2275 * old systems without an AcpiOpRegion.
2276 *
2277 * acpi_video_register() will report -ENODEV later as well due
2278 * to acpi_disabled when i915.ko tries to register itself afterwards.
2279 */
2280 if (acpi_disabled)
2281 return 0;
2282
2283 if (intel_opregion_present())
2284 return 0;
2285
2286 return acpi_video_register();
2287}
2288
2289static void __exit acpi_video_exit(void)
2290{
2291 acpi_video_unregister();
2292}
2293
2294module_init(acpi_video_init);
2295module_exit(acpi_video_exit);