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#include <linux/string_choices.h>
31
32#define ACPI_VIDEO_BUS_NAME "Video Bus"
33#define ACPI_VIDEO_DEVICE_NAME "Video Device"
34
35#define MAX_NAME_LEN 20
36
37MODULE_AUTHOR("Bruno Ducrot");
38MODULE_DESCRIPTION("ACPI Video Driver");
39MODULE_LICENSE("GPL");
40
41static bool brightness_switch_enabled = true;
42module_param(brightness_switch_enabled, bool, 0644);
43
44/*
45 * By default, we don't allow duplicate ACPI video bus devices
46 * under the same VGA controller
47 */
48static bool allow_duplicates;
49module_param(allow_duplicates, bool, 0644);
50
51#define REPORT_OUTPUT_KEY_EVENTS 0x01
52#define REPORT_BRIGHTNESS_KEY_EVENTS 0x02
53static int report_key_events = -1;
54module_param(report_key_events, int, 0644);
55MODULE_PARM_DESC(report_key_events,
56 "0: none, 1: output changes, 2: brightness changes, 3: all");
57
58static int hw_changes_brightness = -1;
59module_param(hw_changes_brightness, int, 0644);
60MODULE_PARM_DESC(hw_changes_brightness,
61 "Set this to 1 on buggy hw which changes the brightness itself when "
62 "a hotkey is pressed: -1: auto, 0: normal 1: hw-changes-brightness");
63
64/*
65 * Whether the struct acpi_video_device_attrib::device_id_scheme bit should be
66 * assumed even if not actually set.
67 */
68static bool device_id_scheme = false;
69module_param(device_id_scheme, bool, 0444);
70
71static int only_lcd;
72module_param(only_lcd, int, 0444);
73
74static bool may_report_brightness_keys;
75static int register_count;
76static DEFINE_MUTEX(register_count_mutex);
77static DEFINE_MUTEX(video_list_lock);
78static LIST_HEAD(video_bus_head);
79static int acpi_video_bus_add(struct acpi_device *device);
80static void acpi_video_bus_remove(struct acpi_device *device);
81static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data);
82
83/*
84 * Indices in the _BCL method response: the first two items are special,
85 * the rest are all supported levels.
86 *
87 * See page 575 of the ACPI spec 3.0
88 */
89enum acpi_video_level_idx {
90 ACPI_VIDEO_AC_LEVEL, /* level when machine has full power */
91 ACPI_VIDEO_BATTERY_LEVEL, /* level when machine is on batteries */
92 ACPI_VIDEO_FIRST_LEVEL, /* actual supported levels begin here */
93};
94
95static const struct acpi_device_id video_device_ids[] = {
96 {ACPI_VIDEO_HID, 0},
97 {.id: "", .driver_data: 0},
98};
99MODULE_DEVICE_TABLE(acpi, video_device_ids);
100
101static struct acpi_driver acpi_video_bus = {
102 .name = "video",
103 .class = ACPI_VIDEO_CLASS,
104 .ids = video_device_ids,
105 .ops = {
106 .add = acpi_video_bus_add,
107 .remove = acpi_video_bus_remove,
108 },
109};
110
111struct acpi_video_bus_flags {
112 u8 multihead:1; /* can switch video heads */
113 u8 rom:1; /* can retrieve a video rom */
114 u8 post:1; /* can configure the head to */
115 u8 reserved:5;
116};
117
118struct acpi_video_bus_cap {
119 u8 _DOS:1; /* Enable/Disable output switching */
120 u8 _DOD:1; /* Enumerate all devices attached to display adapter */
121 u8 _ROM:1; /* Get ROM Data */
122 u8 _GPD:1; /* Get POST Device */
123 u8 _SPD:1; /* Set POST Device */
124 u8 _VPO:1; /* Video POST Options */
125 u8 reserved:2;
126};
127
128struct acpi_video_device_attrib {
129 u32 display_index:4; /* A zero-based instance of the Display */
130 u32 display_port_attachment:4; /* This field differentiates the display type */
131 u32 display_type:4; /* Describe the specific type in use */
132 u32 vendor_specific:4; /* Chipset Vendor Specific */
133 u32 bios_can_detect:1; /* BIOS can detect the device */
134 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to
135 the VGA device. */
136 u32 pipe_id:3; /* For VGA multiple-head devices. */
137 u32 reserved:10; /* Must be 0 */
138
139 /*
140 * The device ID might not actually follow the scheme described by this
141 * struct acpi_video_device_attrib. If it does, then this bit
142 * device_id_scheme is set; otherwise, other fields should be ignored.
143 *
144 * (but also see the global flag device_id_scheme)
145 */
146 u32 device_id_scheme:1;
147};
148
149struct acpi_video_enumerated_device {
150 union {
151 u32 int_val;
152 struct acpi_video_device_attrib attrib;
153 } value;
154 struct acpi_video_device *bind_info;
155};
156
157struct acpi_video_bus {
158 struct acpi_device *device;
159 bool backlight_registered;
160 u8 dos_setting;
161 struct acpi_video_enumerated_device *attached_array;
162 u8 attached_count;
163 u8 child_count;
164 struct acpi_video_bus_cap cap;
165 struct acpi_video_bus_flags flags;
166 struct list_head video_device_list;
167 struct mutex device_list_lock; /* protects video_device_list */
168 struct list_head entry;
169 struct input_dev *input;
170 char phys[32]; /* for input device */
171 struct notifier_block pm_nb;
172};
173
174struct acpi_video_device_flags {
175 u8 crt:1;
176 u8 lcd:1;
177 u8 tvout:1;
178 u8 dvi:1;
179 u8 bios:1;
180 u8 unknown:1;
181 u8 notify:1;
182 u8 reserved:1;
183};
184
185struct acpi_video_device_cap {
186 u8 _ADR:1; /* Return the unique ID */
187 u8 _BCL:1; /* Query list of brightness control levels supported */
188 u8 _BCM:1; /* Set the brightness level */
189 u8 _BQC:1; /* Get current brightness level */
190 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
191 u8 _DDC:1; /* Return the EDID for this device */
192};
193
194struct acpi_video_device {
195 unsigned long device_id;
196 struct acpi_video_device_flags flags;
197 struct acpi_video_device_cap cap;
198 struct list_head entry;
199 struct delayed_work switch_brightness_work;
200 int switch_brightness_event;
201 struct acpi_video_bus *video;
202 struct acpi_device *dev;
203 struct acpi_video_device_brightness *brightness;
204 struct backlight_device *backlight;
205 struct thermal_cooling_device *cooling_dev;
206};
207
208static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
209static void acpi_video_device_rebind(struct acpi_video_bus *video);
210static void acpi_video_device_bind(struct acpi_video_bus *video,
211 struct acpi_video_device *device);
212static int acpi_video_device_enumerate(struct acpi_video_bus *video);
213static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
214 int level);
215static int acpi_video_device_lcd_get_level_current(
216 struct acpi_video_device *device,
217 unsigned long long *level, bool raw);
218static int acpi_video_get_next_level(struct acpi_video_device *device,
219 u32 level_current, u32 event);
220static void acpi_video_switch_brightness(struct work_struct *work);
221
222/* backlight device sysfs support */
223static int acpi_video_get_brightness(struct backlight_device *bd)
224{
225 unsigned long long cur_level;
226 int i;
227 struct acpi_video_device *vd = bl_get_data(bl_dev: bd);
228
229 if (acpi_video_device_lcd_get_level_current(device: vd, level: &cur_level, raw: false))
230 return -EINVAL;
231 for (i = ACPI_VIDEO_FIRST_LEVEL; i < vd->brightness->count; i++) {
232 if (vd->brightness->levels[i] == cur_level)
233 return i - ACPI_VIDEO_FIRST_LEVEL;
234 }
235 return 0;
236}
237
238static int acpi_video_set_brightness(struct backlight_device *bd)
239{
240 int request_level = bd->props.brightness + ACPI_VIDEO_FIRST_LEVEL;
241 struct acpi_video_device *vd = bl_get_data(bl_dev: bd);
242
243 cancel_delayed_work(dwork: &vd->switch_brightness_work);
244 return acpi_video_device_lcd_set_level(device: vd,
245 level: vd->brightness->levels[request_level]);
246}
247
248static const struct backlight_ops acpi_backlight_ops = {
249 .get_brightness = acpi_video_get_brightness,
250 .update_status = acpi_video_set_brightness,
251};
252
253/* thermal cooling device callbacks */
254static int video_get_max_state(struct thermal_cooling_device *cooling_dev,
255 unsigned long *state)
256{
257 struct acpi_video_device *video = cooling_dev->devdata;
258
259 *state = video->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1;
260 return 0;
261}
262
263static int video_get_cur_state(struct thermal_cooling_device *cooling_dev,
264 unsigned long *state)
265{
266 struct acpi_video_device *video = cooling_dev->devdata;
267 unsigned long long level;
268 int offset;
269
270 if (acpi_video_device_lcd_get_level_current(device: video, level: &level, raw: false))
271 return -EINVAL;
272 for (offset = ACPI_VIDEO_FIRST_LEVEL; offset < video->brightness->count;
273 offset++)
274 if (level == video->brightness->levels[offset]) {
275 *state = video->brightness->count - offset - 1;
276 return 0;
277 }
278
279 return -EINVAL;
280}
281
282static int
283video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
284{
285 struct acpi_video_device *video = cooling_dev->devdata;
286 int level;
287
288 if (state >= video->brightness->count - ACPI_VIDEO_FIRST_LEVEL)
289 return -EINVAL;
290
291 state = video->brightness->count - state;
292 level = video->brightness->levels[state - 1];
293 return acpi_video_device_lcd_set_level(device: video, level);
294}
295
296static const struct thermal_cooling_device_ops video_cooling_ops = {
297 .get_max_state = video_get_max_state,
298 .get_cur_state = video_get_cur_state,
299 .set_cur_state = video_set_cur_state,
300};
301
302/*
303 * --------------------------------------------------------------------------
304 * Video Management
305 * --------------------------------------------------------------------------
306 */
307
308static int
309acpi_video_device_lcd_query_levels(acpi_handle handle,
310 union acpi_object **levels)
311{
312 int status;
313 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
314 union acpi_object *obj;
315
316
317 *levels = NULL;
318
319 status = acpi_evaluate_object(object: handle, pathname: "_BCL", NULL, return_object_buffer: &buffer);
320 if (ACPI_FAILURE(status))
321 return status;
322 obj = (union acpi_object *)buffer.pointer;
323 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
324 acpi_handle_info(handle, "Invalid _BCL data\n");
325 status = -EFAULT;
326 goto err;
327 }
328
329 *levels = obj;
330
331 return 0;
332
333err:
334 kfree(objp: buffer.pointer);
335
336 return status;
337}
338
339static int
340acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
341{
342 int status;
343 int state;
344
345 status = acpi_execute_simple_method(handle: device->dev->handle,
346 method: "_BCM", arg: level);
347 if (ACPI_FAILURE(status)) {
348 acpi_handle_info(device->dev->handle, "_BCM evaluation failed\n");
349 return -EIO;
350 }
351
352 device->brightness->curr = level;
353 for (state = ACPI_VIDEO_FIRST_LEVEL; state < device->brightness->count;
354 state++)
355 if (level == device->brightness->levels[state]) {
356 if (device->backlight)
357 device->backlight->props.brightness =
358 state - ACPI_VIDEO_FIRST_LEVEL;
359 return 0;
360 }
361
362 acpi_handle_info(device->dev->handle, "Current brightness invalid\n");
363 return -EINVAL;
364}
365
366/*
367 * For some buggy _BQC methods, we need to add a constant value to
368 * the _BQC return value to get the actual current brightness level
369 */
370
371static int bqc_offset_aml_bug_workaround;
372static int video_set_bqc_offset(const struct dmi_system_id *d)
373{
374 bqc_offset_aml_bug_workaround = 9;
375 return 0;
376}
377
378static int video_set_device_id_scheme(const struct dmi_system_id *d)
379{
380 device_id_scheme = true;
381 return 0;
382}
383
384static int video_enable_only_lcd(const struct dmi_system_id *d)
385{
386 only_lcd = true;
387 return 0;
388}
389
390static int video_set_report_key_events(const struct dmi_system_id *id)
391{
392 if (report_key_events == -1)
393 report_key_events = (uintptr_t)id->driver_data;
394 return 0;
395}
396
397static int video_hw_changes_brightness(
398 const struct dmi_system_id *d)
399{
400 if (hw_changes_brightness == -1)
401 hw_changes_brightness = 1;
402 return 0;
403}
404
405static const struct dmi_system_id video_dmi_table[] = {
406 /*
407 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
408 */
409 {
410 .callback = video_set_bqc_offset,
411 .ident = "Acer Aspire 5720",
412 .matches = {
413 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
414 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
415 },
416 },
417 {
418 .callback = video_set_bqc_offset,
419 .ident = "Acer Aspire 5710Z",
420 .matches = {
421 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
422 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
423 },
424 },
425 {
426 .callback = video_set_bqc_offset,
427 .ident = "eMachines E510",
428 .matches = {
429 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
430 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
431 },
432 },
433 {
434 .callback = video_set_bqc_offset,
435 .ident = "Acer Aspire 5315",
436 .matches = {
437 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
438 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
439 },
440 },
441 {
442 .callback = video_set_bqc_offset,
443 .ident = "Acer Aspire 7720",
444 .matches = {
445 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
446 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
447 },
448 },
449
450 /*
451 * Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set
452 * but the IDs actually follow the Device ID Scheme.
453 */
454 {
455 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
456 .callback = video_set_device_id_scheme,
457 .ident = "ESPRIMO Mobile M9410",
458 .matches = {
459 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
460 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
461 },
462 },
463 /*
464 * Some machines have multiple video output devices, but only the one
465 * that is the type of LCD can do the backlight control so we should not
466 * register backlight interface for other video output devices.
467 */
468 {
469 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
470 .callback = video_enable_only_lcd,
471 .ident = "ESPRIMO Mobile M9410",
472 .matches = {
473 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
474 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
475 },
476 },
477 /*
478 * Some machines report wrong key events on the acpi-bus, suppress
479 * key event reporting on these. Note this is only intended to work
480 * around events which are plain wrong. In some cases we get double
481 * events, in this case acpi-video is considered the canonical source
482 * and the events from the other source should be filtered. E.g.
483 * by calling acpi_video_handles_brightness_key_presses() from the
484 * vendor acpi/wmi driver or by using /lib/udev/hwdb.d/60-keyboard.hwdb
485 */
486 {
487 .callback = video_set_report_key_events,
488 .driver_data = (void *)((uintptr_t)REPORT_OUTPUT_KEY_EVENTS),
489 .ident = "Dell Vostro V131",
490 .matches = {
491 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
492 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
493 },
494 },
495 {
496 .callback = video_set_report_key_events,
497 .driver_data = (void *)((uintptr_t)REPORT_BRIGHTNESS_KEY_EVENTS),
498 .ident = "Dell Vostro 3350",
499 .matches = {
500 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
501 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3350"),
502 },
503 },
504 {
505 .callback = video_set_report_key_events,
506 .driver_data = (void *)((uintptr_t)REPORT_BRIGHTNESS_KEY_EVENTS),
507 .ident = "COLORFUL X15 AT 23",
508 .matches = {
509 DMI_MATCH(DMI_SYS_VENDOR, "COLORFUL"),
510 DMI_MATCH(DMI_PRODUCT_NAME, "X15 AT 23"),
511 },
512 },
513 /*
514 * Some machines change the brightness themselves when a brightness
515 * hotkey gets pressed, despite us telling them not to. In this case
516 * acpi_video_device_notify() should only call backlight_force_update(
517 * BACKLIGHT_UPDATE_HOTKEY) and not do anything else.
518 */
519 {
520 /* https://bugzilla.kernel.org/show_bug.cgi?id=204077 */
521 .callback = video_hw_changes_brightness,
522 .ident = "Packard Bell EasyNote MZ35",
523 .matches = {
524 DMI_MATCH(DMI_SYS_VENDOR, "Packard Bell"),
525 DMI_MATCH(DMI_PRODUCT_NAME, "EasyNote MZ35"),
526 },
527 },
528 {}
529};
530
531static unsigned long long
532acpi_video_bqc_value_to_level(struct acpi_video_device *device,
533 unsigned long long bqc_value)
534{
535 unsigned long long level;
536
537 if (device->brightness->flags._BQC_use_index) {
538 /*
539 * _BQC returns an index that doesn't account for the first 2
540 * items with special meaning (see enum acpi_video_level_idx),
541 * so we need to compensate for that by offsetting ourselves
542 */
543 if (device->brightness->flags._BCL_reversed)
544 bqc_value = device->brightness->count -
545 ACPI_VIDEO_FIRST_LEVEL - 1 - bqc_value;
546
547 level = device->brightness->levels[bqc_value +
548 ACPI_VIDEO_FIRST_LEVEL];
549 } else {
550 level = bqc_value;
551 }
552
553 level += bqc_offset_aml_bug_workaround;
554
555 return level;
556}
557
558static int
559acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
560 unsigned long long *level, bool raw)
561{
562 acpi_status status = AE_OK;
563 int i;
564
565 if (device->cap._BQC || device->cap._BCQ) {
566 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
567
568 status = acpi_evaluate_integer(handle: device->dev->handle, pathname: buf,
569 NULL, data: level);
570 if (ACPI_SUCCESS(status)) {
571 if (raw) {
572 /*
573 * Caller has indicated he wants the raw
574 * value returned by _BQC, so don't furtherly
575 * mess with the value.
576 */
577 return 0;
578 }
579
580 *level = acpi_video_bqc_value_to_level(device, bqc_value: *level);
581
582 for (i = ACPI_VIDEO_FIRST_LEVEL;
583 i < device->brightness->count; i++)
584 if (device->brightness->levels[i] == *level) {
585 device->brightness->curr = *level;
586 return 0;
587 }
588 /*
589 * BQC returned an invalid level.
590 * Stop using it.
591 */
592 acpi_handle_info(device->dev->handle,
593 "%s returned an invalid level", buf);
594 device->cap._BQC = device->cap._BCQ = 0;
595 } else {
596 /*
597 * Fixme:
598 * should we return an error or ignore this failure?
599 * dev->brightness->curr is a cached value which stores
600 * the correct current backlight level in most cases.
601 * ACPI video backlight still works w/ buggy _BQC.
602 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
603 */
604 acpi_handle_info(device->dev->handle,
605 "%s evaluation failed", buf);
606 device->cap._BQC = device->cap._BCQ = 0;
607 }
608 }
609
610 *level = device->brightness->curr;
611 return 0;
612}
613
614/**
615 * acpi_video_device_EDID() - Get EDID from ACPI _DDC
616 * @device: video output device (LCD, CRT, ..)
617 * @edid: address for returned EDID pointer
618 * @length: _DDC length to request (must be a multiple of 128)
619 *
620 * Get EDID from ACPI _DDC. On success, a pointer to the EDID data is written
621 * to the @edid address, and the length of the EDID is returned. The caller is
622 * responsible for freeing the edid pointer.
623 *
624 * Return the length of EDID (positive value) on success or error (negative
625 * value).
626 */
627static int
628acpi_video_device_EDID(struct acpi_video_device *device, void **edid, int length)
629{
630 acpi_status status;
631 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
632 union acpi_object *obj;
633 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
634 struct acpi_object_list args = { 1, &arg0 };
635 int ret;
636
637 *edid = NULL;
638
639 if (!device)
640 return -ENODEV;
641 if (!length || (length % 128))
642 return -EINVAL;
643
644 arg0.integer.value = length / 128;
645
646 status = acpi_evaluate_object(object: device->dev->handle, pathname: "_DDC", parameter_objects: &args, return_object_buffer: &buffer);
647 if (ACPI_FAILURE(status))
648 return -ENODEV;
649
650 obj = buffer.pointer;
651
652 /*
653 * Some buggy implementations incorrectly return the EDID buffer in an ACPI package.
654 * In this case, extract the buffer from the package.
655 */
656 if (obj && obj->type == ACPI_TYPE_PACKAGE && obj->package.count == 1)
657 obj = &obj->package.elements[0];
658
659 if (obj && obj->type == ACPI_TYPE_BUFFER) {
660 *edid = kmemdup(obj->buffer.pointer, obj->buffer.length, GFP_KERNEL);
661 ret = *edid ? obj->buffer.length : -ENOMEM;
662 } else {
663 acpi_handle_debug(device->dev->handle,
664 "Invalid _DDC data for length %d\n", length);
665 ret = -EFAULT;
666 }
667
668 kfree(objp: buffer.pointer);
669 return ret;
670}
671
672/* bus */
673
674/*
675 * Arg:
676 * video : video bus device pointer
677 * bios_flag :
678 * 0. The system BIOS should NOT automatically switch(toggle)
679 * the active display output.
680 * 1. The system BIOS should automatically switch (toggle) the
681 * active display output. No switch event.
682 * 2. The _DGS value should be locked.
683 * 3. The system BIOS should not automatically switch (toggle) the
684 * active display output, but instead generate the display switch
685 * event notify code.
686 * lcd_flag :
687 * 0. The system BIOS should automatically control the brightness level
688 * of the LCD when:
689 * - the power changes from AC to DC (ACPI appendix B)
690 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs)
691 * 1. The system BIOS should NOT automatically control the brightness
692 * level of the LCD when:
693 * - the power changes from AC to DC (ACPI appendix B)
694 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs)
695 * Return Value:
696 * -EINVAL wrong arg.
697 */
698
699static int
700acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
701{
702 acpi_status status;
703
704 if (!video->cap._DOS)
705 return 0;
706
707 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
708 return -EINVAL;
709 video->dos_setting = (lcd_flag << 2) | bios_flag;
710 status = acpi_execute_simple_method(handle: video->device->handle, method: "_DOS",
711 arg: (lcd_flag << 2) | bios_flag);
712 if (ACPI_FAILURE(status))
713 return -EIO;
714
715 return 0;
716}
717
718/*
719 * Simple comparison function used to sort backlight levels.
720 */
721
722static int
723acpi_video_cmp_level(const void *a, const void *b)
724{
725 return *(int *)a - *(int *)b;
726}
727
728/*
729 * Decides if _BQC/_BCQ for this system is usable
730 *
731 * We do this by changing the level first and then read out the current
732 * brightness level, if the value does not match, find out if it is using
733 * index. If not, clear the _BQC/_BCQ capability.
734 */
735static int acpi_video_bqc_quirk(struct acpi_video_device *device,
736 int max_level, int current_level)
737{
738 struct acpi_video_device_brightness *br = device->brightness;
739 int result;
740 unsigned long long level;
741 int test_level;
742
743 /* don't mess with existing known broken systems */
744 if (bqc_offset_aml_bug_workaround)
745 return 0;
746
747 /*
748 * Some systems always report current brightness level as maximum
749 * through _BQC, we need to test another value for them. However,
750 * there is a subtlety:
751 *
752 * If the _BCL package ordering is descending, the first level
753 * (br->levels[2]) is likely to be 0, and if the number of levels
754 * matches the number of steps, we might confuse a returned level to
755 * mean the index.
756 *
757 * For example:
758 *
759 * current_level = max_level = 100
760 * test_level = 0
761 * returned level = 100
762 *
763 * In this case 100 means the level, not the index, and _BCM failed.
764 * Still, if the _BCL package ordering is descending, the index of
765 * level 0 is also 100, so we assume _BQC is indexed, when it's not.
766 *
767 * This causes all _BQC calls to return bogus values causing weird
768 * behavior from the user's perspective. For example:
769 *
770 * xbacklight -set 10; xbacklight -set 20;
771 *
772 * would flash to 90% and then slowly down to the desired level (20).
773 *
774 * The solution is simple; test anything other than the first level
775 * (e.g. 1).
776 */
777 test_level = current_level == max_level
778 ? br->levels[ACPI_VIDEO_FIRST_LEVEL + 1]
779 : max_level;
780
781 result = acpi_video_device_lcd_set_level(device, level: test_level);
782 if (result)
783 return result;
784
785 result = acpi_video_device_lcd_get_level_current(device, level: &level, raw: true);
786 if (result)
787 return result;
788
789 if (level != test_level) {
790 /* buggy _BQC found, need to find out if it uses index */
791 if (level < br->count) {
792 if (br->flags._BCL_reversed)
793 level = br->count - ACPI_VIDEO_FIRST_LEVEL - 1 - level;
794 if (br->levels[level + ACPI_VIDEO_FIRST_LEVEL] == test_level)
795 br->flags._BQC_use_index = 1;
796 }
797
798 if (!br->flags._BQC_use_index)
799 device->cap._BQC = device->cap._BCQ = 0;
800 }
801
802 return 0;
803}
804
805int acpi_video_get_levels(struct acpi_device *device,
806 struct acpi_video_device_brightness **dev_br,
807 int *pmax_level)
808{
809 union acpi_object *obj = NULL;
810 int i, max_level = 0, count = 0, level_ac_battery = 0;
811 union acpi_object *o;
812 struct acpi_video_device_brightness *br = NULL;
813 int result = 0;
814 u32 value;
815
816 if (ACPI_FAILURE(acpi_video_device_lcd_query_levels(device->handle, &obj))) {
817 acpi_handle_debug(device->handle,
818 "Could not query available LCD brightness level\n");
819 result = -ENODEV;
820 goto out;
821 }
822
823 if (obj->package.count < ACPI_VIDEO_FIRST_LEVEL) {
824 result = -EINVAL;
825 goto out;
826 }
827
828 br = kzalloc(sizeof(*br), GFP_KERNEL);
829 if (!br) {
830 result = -ENOMEM;
831 goto out;
832 }
833
834 /*
835 * Note that we have to reserve 2 extra items (ACPI_VIDEO_FIRST_LEVEL),
836 * in order to account for buggy BIOS which don't export the first two
837 * special levels (see below)
838 */
839 br->levels = kmalloc_array(obj->package.count + ACPI_VIDEO_FIRST_LEVEL,
840 sizeof(*br->levels),
841 GFP_KERNEL);
842 if (!br->levels) {
843 result = -ENOMEM;
844 goto out_free;
845 }
846
847 for (i = 0; i < obj->package.count; i++) {
848 o = (union acpi_object *)&obj->package.elements[i];
849 if (o->type != ACPI_TYPE_INTEGER) {
850 acpi_handle_info(device->handle, "Invalid data\n");
851 continue;
852 }
853 value = (u32) o->integer.value;
854 /* Skip duplicate entries */
855 if (count > ACPI_VIDEO_FIRST_LEVEL
856 && br->levels[count - 1] == value)
857 continue;
858
859 br->levels[count] = value;
860
861 if (br->levels[count] > max_level)
862 max_level = br->levels[count];
863 count++;
864 }
865
866 /*
867 * some buggy BIOS don't export the levels
868 * when machine is on AC/Battery in _BCL package.
869 * In this case, the first two elements in _BCL packages
870 * are also supported brightness levels that OS should take care of.
871 */
872 for (i = ACPI_VIDEO_FIRST_LEVEL; i < count; i++) {
873 if (br->levels[i] == br->levels[ACPI_VIDEO_AC_LEVEL])
874 level_ac_battery++;
875 if (br->levels[i] == br->levels[ACPI_VIDEO_BATTERY_LEVEL])
876 level_ac_battery++;
877 }
878
879 if (level_ac_battery < ACPI_VIDEO_FIRST_LEVEL) {
880 level_ac_battery = ACPI_VIDEO_FIRST_LEVEL - level_ac_battery;
881 br->flags._BCL_no_ac_battery_levels = 1;
882 for (i = (count - 1 + level_ac_battery);
883 i >= ACPI_VIDEO_FIRST_LEVEL; i--)
884 br->levels[i] = br->levels[i - level_ac_battery];
885 count += level_ac_battery;
886 } else if (level_ac_battery > ACPI_VIDEO_FIRST_LEVEL)
887 acpi_handle_info(device->handle,
888 "Too many duplicates in _BCL package");
889
890 /* Check if the _BCL package is in a reversed order */
891 if (max_level == br->levels[ACPI_VIDEO_FIRST_LEVEL]) {
892 br->flags._BCL_reversed = 1;
893 sort(base: &br->levels[ACPI_VIDEO_FIRST_LEVEL],
894 num: count - ACPI_VIDEO_FIRST_LEVEL,
895 size: sizeof(br->levels[ACPI_VIDEO_FIRST_LEVEL]),
896 cmp_func: acpi_video_cmp_level, NULL);
897 } else if (max_level != br->levels[count - 1])
898 acpi_handle_info(device->handle,
899 "Found unordered _BCL package");
900
901 br->count = count;
902 *dev_br = br;
903 if (pmax_level)
904 *pmax_level = max_level;
905
906out:
907 kfree(objp: obj);
908 return result;
909out_free:
910 kfree(objp: br);
911 goto out;
912}
913EXPORT_SYMBOL(acpi_video_get_levels);
914
915/*
916 * Arg:
917 * device : video output device (LCD, CRT, ..)
918 *
919 * Return Value:
920 * Maximum brightness level
921 *
922 * Allocate and initialize device->brightness.
923 */
924
925static int
926acpi_video_init_brightness(struct acpi_video_device *device)
927{
928 int i, max_level = 0;
929 unsigned long long level, level_old;
930 struct acpi_video_device_brightness *br = NULL;
931 int result;
932
933 result = acpi_video_get_levels(device->dev, &br, &max_level);
934 if (result)
935 return result;
936 device->brightness = br;
937
938 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
939 br->curr = level = max_level;
940
941 if (!device->cap._BQC)
942 goto set_level;
943
944 result = acpi_video_device_lcd_get_level_current(device,
945 level: &level_old, raw: true);
946 if (result)
947 goto out_free_levels;
948
949 result = acpi_video_bqc_quirk(device, max_level, current_level: level_old);
950 if (result)
951 goto out_free_levels;
952 /*
953 * cap._BQC may get cleared due to _BQC is found to be broken
954 * in acpi_video_bqc_quirk, so check again here.
955 */
956 if (!device->cap._BQC)
957 goto set_level;
958
959 level = acpi_video_bqc_value_to_level(device, bqc_value: level_old);
960 /*
961 * On some buggy laptops, _BQC returns an uninitialized
962 * value when invoked for the first time, i.e.
963 * level_old is invalid (no matter whether it's a level
964 * or an index). Set the backlight to max_level in this case.
965 */
966 for (i = ACPI_VIDEO_FIRST_LEVEL; i < br->count; i++)
967 if (level == br->levels[i])
968 break;
969 if (i == br->count || !level)
970 level = max_level;
971
972set_level:
973 result = acpi_video_device_lcd_set_level(device, level);
974 if (result)
975 goto out_free_levels;
976
977 acpi_handle_debug(device->dev->handle, "found %d brightness levels\n",
978 br->count - ACPI_VIDEO_FIRST_LEVEL);
979
980 return 0;
981
982out_free_levels:
983 kfree(objp: br->levels);
984 kfree(objp: br);
985 device->brightness = NULL;
986 return result;
987}
988
989/*
990 * Arg:
991 * device : video output device (LCD, CRT, ..)
992 *
993 * Return Value:
994 * None
995 *
996 * Find out all required AML methods defined under the output
997 * device.
998 */
999
1000static void acpi_video_device_find_cap(struct acpi_video_device *device)
1001{
1002 if (acpi_has_method(handle: device->dev->handle, name: "_ADR"))
1003 device->cap._ADR = 1;
1004 if (acpi_has_method(handle: device->dev->handle, name: "_BCL"))
1005 device->cap._BCL = 1;
1006 if (acpi_has_method(handle: device->dev->handle, name: "_BCM"))
1007 device->cap._BCM = 1;
1008 if (acpi_has_method(handle: device->dev->handle, name: "_BQC")) {
1009 device->cap._BQC = 1;
1010 } else if (acpi_has_method(handle: device->dev->handle, name: "_BCQ")) {
1011 acpi_handle_info(device->dev->handle,
1012 "_BCQ is used instead of _BQC\n");
1013 device->cap._BCQ = 1;
1014 }
1015
1016 if (acpi_has_method(handle: device->dev->handle, name: "_DDC"))
1017 device->cap._DDC = 1;
1018}
1019
1020/*
1021 * Arg:
1022 * device : video output device (VGA)
1023 *
1024 * Return Value:
1025 * None
1026 *
1027 * Find out all required AML methods defined under the video bus device.
1028 */
1029
1030static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1031{
1032 if (acpi_has_method(handle: video->device->handle, name: "_DOS"))
1033 video->cap._DOS = 1;
1034 if (acpi_has_method(handle: video->device->handle, name: "_DOD"))
1035 video->cap._DOD = 1;
1036 if (acpi_has_method(handle: video->device->handle, name: "_ROM"))
1037 video->cap._ROM = 1;
1038 if (acpi_has_method(handle: video->device->handle, name: "_GPD"))
1039 video->cap._GPD = 1;
1040 if (acpi_has_method(handle: video->device->handle, name: "_SPD"))
1041 video->cap._SPD = 1;
1042 if (acpi_has_method(handle: video->device->handle, name: "_VPO"))
1043 video->cap._VPO = 1;
1044}
1045
1046/*
1047 * Check whether the video bus device has required AML method to
1048 * support the desired features
1049 */
1050
1051static int acpi_video_bus_check(struct acpi_video_bus *video)
1052{
1053 acpi_status status = -ENOENT;
1054 struct pci_dev *dev;
1055
1056 if (!video)
1057 return -EINVAL;
1058
1059 dev = acpi_get_pci_dev(video->device->handle);
1060 if (!dev)
1061 return -ENODEV;
1062 pci_dev_put(dev);
1063
1064 /*
1065 * Since there is no HID, CID and so on for VGA driver, we have
1066 * to check well known required nodes.
1067 */
1068
1069 /* Does this device support video switching? */
1070 if (video->cap._DOS || video->cap._DOD) {
1071 if (!video->cap._DOS) {
1072 pr_info(FW_BUG "ACPI(%s) defines _DOD but not _DOS\n",
1073 acpi_device_bid(video->device));
1074 }
1075 video->flags.multihead = 1;
1076 status = 0;
1077 }
1078
1079 /* Does this device support retrieving a video ROM? */
1080 if (video->cap._ROM) {
1081 video->flags.rom = 1;
1082 status = 0;
1083 }
1084
1085 /* Does this device support configuring which video device to POST? */
1086 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1087 video->flags.post = 1;
1088 status = 0;
1089 }
1090
1091 return status;
1092}
1093
1094/*
1095 * --------------------------------------------------------------------------
1096 * Driver Interface
1097 * --------------------------------------------------------------------------
1098 */
1099
1100/* device interface */
1101static struct acpi_video_device_attrib *
1102acpi_video_get_device_attr(struct acpi_video_bus *video, 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.attrib;
1111 }
1112
1113 return NULL;
1114}
1115
1116static int
1117acpi_video_get_device_type(struct acpi_video_bus *video,
1118 unsigned long device_id)
1119{
1120 struct acpi_video_enumerated_device *ids;
1121 int i;
1122
1123 for (i = 0; i < video->attached_count; i++) {
1124 ids = &video->attached_array[i];
1125 if ((ids->value.int_val & 0xffff) == device_id)
1126 return ids->value.int_val;
1127 }
1128
1129 return 0;
1130}
1131
1132static int acpi_video_bus_get_one_device(struct acpi_device *device, void *arg)
1133{
1134 struct acpi_video_bus *video = arg;
1135 struct acpi_video_device_attrib *attribute;
1136 struct acpi_video_device *data;
1137 unsigned long long device_id;
1138 acpi_status status;
1139 int device_type;
1140
1141 status = acpi_evaluate_integer(handle: device->handle, pathname: "_ADR", NULL, data: &device_id);
1142 /* Skip devices without _ADR instead of failing. */
1143 if (ACPI_FAILURE(status))
1144 goto exit;
1145
1146 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1147 if (!data) {
1148 dev_dbg(&device->dev, "Cannot attach\n");
1149 return -ENOMEM;
1150 }
1151
1152 strscpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1153 strscpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1154
1155 data->device_id = device_id;
1156 data->video = video;
1157 data->dev = device;
1158 INIT_DELAYED_WORK(&data->switch_brightness_work,
1159 acpi_video_switch_brightness);
1160
1161 attribute = acpi_video_get_device_attr(video, device_id);
1162
1163 if (attribute && (attribute->device_id_scheme || device_id_scheme)) {
1164 switch (attribute->display_type) {
1165 case ACPI_VIDEO_DISPLAY_CRT:
1166 data->flags.crt = 1;
1167 break;
1168 case ACPI_VIDEO_DISPLAY_TV:
1169 data->flags.tvout = 1;
1170 break;
1171 case ACPI_VIDEO_DISPLAY_DVI:
1172 data->flags.dvi = 1;
1173 break;
1174 case ACPI_VIDEO_DISPLAY_LCD:
1175 data->flags.lcd = 1;
1176 break;
1177 default:
1178 data->flags.unknown = 1;
1179 break;
1180 }
1181 if (attribute->bios_can_detect)
1182 data->flags.bios = 1;
1183 } else {
1184 /* Check for legacy IDs */
1185 device_type = acpi_video_get_device_type(video, device_id);
1186 /* Ignore bits 16 and 18-20 */
1187 switch (device_type & 0xffe2ffff) {
1188 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1189 data->flags.crt = 1;
1190 break;
1191 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1192 data->flags.lcd = 1;
1193 break;
1194 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1195 data->flags.tvout = 1;
1196 break;
1197 default:
1198 data->flags.unknown = 1;
1199 }
1200 }
1201
1202 acpi_video_device_bind(video, device: data);
1203 acpi_video_device_find_cap(device: data);
1204
1205 if (data->cap._BCM && data->cap._BCL)
1206 may_report_brightness_keys = true;
1207
1208 mutex_lock(lock: &video->device_list_lock);
1209 list_add_tail(new: &data->entry, head: &video->video_device_list);
1210 mutex_unlock(lock: &video->device_list_lock);
1211
1212exit:
1213 video->child_count++;
1214 return 0;
1215}
1216
1217/*
1218 * Arg:
1219 * video : video bus device
1220 *
1221 * Return:
1222 * none
1223 *
1224 * Enumerate the video device list of the video bus,
1225 * bind the ids with the corresponding video devices
1226 * under the video bus.
1227 */
1228
1229static void acpi_video_device_rebind(struct acpi_video_bus *video)
1230{
1231 struct acpi_video_device *dev;
1232
1233 mutex_lock(lock: &video->device_list_lock);
1234
1235 list_for_each_entry(dev, &video->video_device_list, entry)
1236 acpi_video_device_bind(video, device: dev);
1237
1238 mutex_unlock(lock: &video->device_list_lock);
1239}
1240
1241/*
1242 * Arg:
1243 * video : video bus device
1244 * device : video output device under the video
1245 * bus
1246 *
1247 * Return:
1248 * none
1249 *
1250 * Bind the ids with the corresponding video devices
1251 * under the video bus.
1252 */
1253
1254static void
1255acpi_video_device_bind(struct acpi_video_bus *video,
1256 struct acpi_video_device *device)
1257{
1258 struct acpi_video_enumerated_device *ids;
1259 int i;
1260
1261 for (i = 0; i < video->attached_count; i++) {
1262 ids = &video->attached_array[i];
1263 if (device->device_id == (ids->value.int_val & 0xffff)) {
1264 ids->bind_info = device;
1265 acpi_handle_debug(video->device->handle, "%s: %d\n",
1266 __func__, i);
1267 }
1268 }
1269}
1270
1271static bool acpi_video_device_in_dod(struct acpi_video_device *device)
1272{
1273 struct acpi_video_bus *video = device->video;
1274 int i;
1275
1276 /*
1277 * If we have a broken _DOD or we have more than 8 output devices
1278 * under the graphics controller node that we can't proper deal with
1279 * in the operation region code currently, no need to test.
1280 */
1281 if (!video->attached_count || video->child_count > 8)
1282 return true;
1283
1284 for (i = 0; i < video->attached_count; i++) {
1285 if ((video->attached_array[i].value.int_val & 0xfff) ==
1286 (device->device_id & 0xfff))
1287 return true;
1288 }
1289
1290 return false;
1291}
1292
1293/*
1294 * Arg:
1295 * video : video bus device
1296 *
1297 * Return:
1298 * < 0 : error
1299 *
1300 * Call _DOD to enumerate all devices attached to display adapter
1301 *
1302 */
1303
1304static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1305{
1306 int status;
1307 int count;
1308 int i;
1309 struct acpi_video_enumerated_device *active_list;
1310 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1311 union acpi_object *dod = NULL;
1312 union acpi_object *obj;
1313
1314 if (!video->cap._DOD)
1315 return AE_NOT_EXIST;
1316
1317 status = acpi_evaluate_object(object: video->device->handle, pathname: "_DOD", NULL, return_object_buffer: &buffer);
1318 if (ACPI_FAILURE(status)) {
1319 acpi_handle_info(video->device->handle,
1320 "_DOD evaluation failed: %s\n",
1321 acpi_format_exception(status));
1322 return status;
1323 }
1324
1325 dod = buffer.pointer;
1326 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1327 acpi_handle_info(video->device->handle, "Invalid _DOD data\n");
1328 status = -EFAULT;
1329 goto out;
1330 }
1331
1332 acpi_handle_debug(video->device->handle, "Found %d video heads in _DOD\n",
1333 dod->package.count);
1334
1335 active_list = kcalloc(1 + dod->package.count,
1336 sizeof(struct acpi_video_enumerated_device),
1337 GFP_KERNEL);
1338 if (!active_list) {
1339 status = -ENOMEM;
1340 goto out;
1341 }
1342
1343 count = 0;
1344 for (i = 0; i < dod->package.count; i++) {
1345 obj = &dod->package.elements[i];
1346
1347 if (obj->type != ACPI_TYPE_INTEGER) {
1348 acpi_handle_info(video->device->handle,
1349 "Invalid _DOD data in element %d\n", i);
1350 continue;
1351 }
1352
1353 active_list[count].value.int_val = obj->integer.value;
1354 active_list[count].bind_info = NULL;
1355
1356 acpi_handle_debug(video->device->handle,
1357 "_DOD element[%d] = %d\n", i,
1358 (int)obj->integer.value);
1359
1360 count++;
1361 }
1362
1363 kfree(objp: video->attached_array);
1364
1365 video->attached_array = active_list;
1366 video->attached_count = count;
1367
1368out:
1369 kfree(objp: buffer.pointer);
1370 return status;
1371}
1372
1373static int
1374acpi_video_get_next_level(struct acpi_video_device *device,
1375 u32 level_current, u32 event)
1376{
1377 int min, max, min_above, max_below, i, l, delta = 255;
1378 max = max_below = 0;
1379 min = min_above = 255;
1380 /* Find closest level to level_current */
1381 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) {
1382 l = device->brightness->levels[i];
1383 if (abs(l - level_current) < abs(delta)) {
1384 delta = l - level_current;
1385 if (!delta)
1386 break;
1387 }
1388 }
1389 /* Adjust level_current to closest available level */
1390 level_current += delta;
1391 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) {
1392 l = device->brightness->levels[i];
1393 if (l < min)
1394 min = l;
1395 if (l > max)
1396 max = l;
1397 if (l < min_above && l > level_current)
1398 min_above = l;
1399 if (l > max_below && l < level_current)
1400 max_below = l;
1401 }
1402
1403 switch (event) {
1404 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1405 return (level_current < max) ? min_above : min;
1406 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1407 return (level_current < max) ? min_above : max;
1408 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1409 return (level_current > min) ? max_below : min;
1410 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1411 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1412 return 0;
1413 default:
1414 return level_current;
1415 }
1416}
1417
1418static void
1419acpi_video_switch_brightness(struct work_struct *work)
1420{
1421 struct acpi_video_device *device = container_of(to_delayed_work(work),
1422 struct acpi_video_device, switch_brightness_work);
1423 unsigned long long level_current, level_next;
1424 int event = device->switch_brightness_event;
1425 int result = -EINVAL;
1426
1427 /* no warning message if acpi_backlight=vendor or a quirk is used */
1428 if (!device->backlight)
1429 return;
1430
1431 if (!device->brightness)
1432 goto out;
1433
1434 result = acpi_video_device_lcd_get_level_current(device,
1435 level: &level_current,
1436 raw: false);
1437 if (result)
1438 goto out;
1439
1440 level_next = acpi_video_get_next_level(device, level_current, event);
1441
1442 result = acpi_video_device_lcd_set_level(device, level: level_next);
1443
1444 if (!result)
1445 backlight_force_update(bd: device->backlight,
1446 reason: BACKLIGHT_UPDATE_HOTKEY);
1447
1448out:
1449 if (result)
1450 acpi_handle_info(device->dev->handle,
1451 "Failed to switch brightness\n");
1452}
1453
1454int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1455 void **edid)
1456{
1457 struct acpi_video_bus *video;
1458 struct acpi_video_device *video_device;
1459 int i, length, ret;
1460
1461 if (!device || !acpi_driver_data(d: device))
1462 return -EINVAL;
1463
1464 video = acpi_driver_data(d: device);
1465
1466 for (i = 0; i < video->attached_count; i++) {
1467 video_device = video->attached_array[i].bind_info;
1468
1469 if (!video_device)
1470 continue;
1471
1472 if (!video_device->cap._DDC)
1473 continue;
1474
1475 if (type) {
1476 switch (type) {
1477 case ACPI_VIDEO_DISPLAY_CRT:
1478 if (!video_device->flags.crt)
1479 continue;
1480 break;
1481 case ACPI_VIDEO_DISPLAY_TV:
1482 if (!video_device->flags.tvout)
1483 continue;
1484 break;
1485 case ACPI_VIDEO_DISPLAY_DVI:
1486 if (!video_device->flags.dvi)
1487 continue;
1488 break;
1489 case ACPI_VIDEO_DISPLAY_LCD:
1490 if (!video_device->flags.lcd)
1491 continue;
1492 break;
1493 }
1494 } else if (video_device->device_id != device_id) {
1495 continue;
1496 }
1497
1498 for (length = 512; length > 0; length -= 128) {
1499 ret = acpi_video_device_EDID(device: video_device, edid, length);
1500 if (ret > 0)
1501 return ret;
1502 }
1503 }
1504
1505 return -ENODEV;
1506}
1507EXPORT_SYMBOL(acpi_video_get_edid);
1508
1509static int
1510acpi_video_bus_get_devices(struct acpi_video_bus *video,
1511 struct acpi_device *device)
1512{
1513 /*
1514 * There are systems where video module known to work fine regardless
1515 * of broken _DOD and ignoring returned value here doesn't cause
1516 * any issues later.
1517 */
1518 acpi_video_device_enumerate(video);
1519
1520 return acpi_dev_for_each_child(adev: device, fn: acpi_video_bus_get_one_device, data: video);
1521}
1522
1523/* acpi_video interface */
1524
1525/*
1526 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1527 * perform any automatic brightness change on receiving a notification.
1528 */
1529static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1530{
1531 return acpi_video_bus_DOS(video, bios_flag: 0,
1532 lcd_flag: acpi_osi_is_win8() ? 1 : 0);
1533}
1534
1535static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1536{
1537 return acpi_video_bus_DOS(video, bios_flag: 0,
1538 lcd_flag: acpi_osi_is_win8() ? 0 : 1);
1539}
1540
1541static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
1542{
1543 struct acpi_device *device = data;
1544 struct acpi_video_bus *video = acpi_driver_data(d: device);
1545 struct input_dev *input;
1546 int keycode = 0;
1547
1548 if (!video || !video->input)
1549 return;
1550
1551 input = video->input;
1552
1553 switch (event) {
1554 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1555 * most likely via hotkey. */
1556 keycode = KEY_SWITCHVIDEOMODE;
1557 break;
1558
1559 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1560 * connector. */
1561 acpi_video_device_enumerate(video);
1562 acpi_video_device_rebind(video);
1563 keycode = KEY_SWITCHVIDEOMODE;
1564 break;
1565
1566 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1567 keycode = KEY_SWITCHVIDEOMODE;
1568 break;
1569 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1570 keycode = KEY_VIDEO_NEXT;
1571 break;
1572 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1573 keycode = KEY_VIDEO_PREV;
1574 break;
1575
1576 default:
1577 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n",
1578 event);
1579 break;
1580 }
1581
1582 if (acpi_notifier_call_chain(device, event, 0))
1583 /* Something vetoed the keypress. */
1584 keycode = 0;
1585
1586 if (keycode && (report_key_events & REPORT_OUTPUT_KEY_EVENTS)) {
1587 input_report_key(dev: input, code: keycode, value: 1);
1588 input_sync(dev: input);
1589 input_report_key(dev: input, code: keycode, value: 0);
1590 input_sync(dev: input);
1591 }
1592}
1593
1594static void brightness_switch_event(struct acpi_video_device *video_device,
1595 u32 event)
1596{
1597 if (!brightness_switch_enabled)
1598 return;
1599
1600 video_device->switch_brightness_event = event;
1601 schedule_delayed_work(dwork: &video_device->switch_brightness_work, HZ / 10);
1602}
1603
1604static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1605{
1606 struct acpi_video_device *video_device = data;
1607 struct acpi_device *device = NULL;
1608 struct acpi_video_bus *bus;
1609 struct input_dev *input;
1610 int keycode = 0;
1611
1612 if (!video_device)
1613 return;
1614
1615 device = video_device->dev;
1616 bus = video_device->video;
1617 input = bus->input;
1618
1619 if (hw_changes_brightness > 0) {
1620 if (video_device->backlight)
1621 backlight_force_update(bd: video_device->backlight,
1622 reason: BACKLIGHT_UPDATE_HOTKEY);
1623 acpi_notifier_call_chain(device, event, 0);
1624 return;
1625 }
1626
1627 switch (event) {
1628 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1629 brightness_switch_event(video_device, event);
1630 keycode = KEY_BRIGHTNESS_CYCLE;
1631 break;
1632 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1633 brightness_switch_event(video_device, event);
1634 keycode = KEY_BRIGHTNESSUP;
1635 break;
1636 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1637 brightness_switch_event(video_device, event);
1638 keycode = KEY_BRIGHTNESSDOWN;
1639 break;
1640 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1641 brightness_switch_event(video_device, event);
1642 keycode = KEY_BRIGHTNESS_ZERO;
1643 break;
1644 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1645 brightness_switch_event(video_device, event);
1646 keycode = KEY_DISPLAY_OFF;
1647 break;
1648 default:
1649 acpi_handle_debug(handle, "Unsupported event [0x%x]\n", event);
1650 break;
1651 }
1652
1653 if (keycode)
1654 may_report_brightness_keys = true;
1655
1656 acpi_notifier_call_chain(device, event, 0);
1657
1658 if (keycode && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS)) {
1659 input_report_key(dev: input, code: keycode, value: 1);
1660 input_sync(dev: input);
1661 input_report_key(dev: input, code: keycode, value: 0);
1662 input_sync(dev: input);
1663 }
1664}
1665
1666static int acpi_video_resume(struct notifier_block *nb,
1667 unsigned long val, void *ign)
1668{
1669 struct acpi_video_bus *video;
1670 struct acpi_video_device *video_device;
1671 int i;
1672
1673 switch (val) {
1674 case PM_POST_HIBERNATION:
1675 case PM_POST_SUSPEND:
1676 case PM_POST_RESTORE:
1677 video = container_of(nb, struct acpi_video_bus, pm_nb);
1678
1679 dev_info(&video->device->dev, "Restoring backlight state\n");
1680
1681 for (i = 0; i < video->attached_count; i++) {
1682 video_device = video->attached_array[i].bind_info;
1683 if (video_device && video_device->brightness)
1684 acpi_video_device_lcd_set_level(device: video_device,
1685 level: video_device->brightness->curr);
1686 }
1687
1688 return NOTIFY_OK;
1689 }
1690 return NOTIFY_DONE;
1691}
1692
1693static acpi_status
1694acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1695 void **return_value)
1696{
1697 struct acpi_device *device = context;
1698 struct acpi_device *sibling;
1699
1700 if (handle == device->handle)
1701 return AE_CTRL_TERMINATE;
1702
1703 sibling = acpi_fetch_acpi_dev(handle);
1704 if (!sibling)
1705 return AE_OK;
1706
1707 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1708 return AE_ALREADY_EXISTS;
1709
1710 return AE_OK;
1711}
1712
1713static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1714{
1715 struct backlight_properties props;
1716 struct pci_dev *pdev;
1717 acpi_handle acpi_parent;
1718 struct device *parent = NULL;
1719 int result;
1720 static int count;
1721 char *name;
1722
1723 result = acpi_video_init_brightness(device);
1724 if (result)
1725 return;
1726
1727 name = kasprintf(GFP_KERNEL, fmt: "acpi_video%d", count);
1728 if (!name)
1729 return;
1730 count++;
1731
1732 if (ACPI_SUCCESS(acpi_get_parent(device->dev->handle, &acpi_parent))) {
1733 pdev = acpi_get_pci_dev(acpi_parent);
1734 if (pdev) {
1735 parent = &pdev->dev;
1736 pci_dev_put(dev: pdev);
1737 }
1738 }
1739
1740 memset(s: &props, c: 0, n: sizeof(struct backlight_properties));
1741 props.type = BACKLIGHT_FIRMWARE;
1742 props.max_brightness =
1743 device->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1;
1744 device->backlight = backlight_device_register(name,
1745 dev: parent,
1746 devdata: device,
1747 ops: &acpi_backlight_ops,
1748 props: &props);
1749 kfree(objp: name);
1750 if (IS_ERR(ptr: device->backlight)) {
1751 device->backlight = NULL;
1752 return;
1753 }
1754
1755 /*
1756 * Save current brightness level in case we have to restore it
1757 * before acpi_video_device_lcd_set_level() is called next time.
1758 */
1759 device->backlight->props.brightness =
1760 acpi_video_get_brightness(bd: device->backlight);
1761
1762 device->cooling_dev = thermal_cooling_device_register("LCD", device,
1763 &video_cooling_ops);
1764 if (IS_ERR(ptr: device->cooling_dev)) {
1765 /*
1766 * Set cooling_dev to NULL so we don't crash trying to free it.
1767 * Also, why the hell we are returning early and not attempt to
1768 * register video output if cooling device registration failed?
1769 * -- dtor
1770 */
1771 device->cooling_dev = NULL;
1772 return;
1773 }
1774
1775 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1776 device->cooling_dev->id);
1777 result = sysfs_create_link(kobj: &device->dev->dev.kobj,
1778 target: &device->cooling_dev->device.kobj,
1779 name: "thermal_cooling");
1780 if (result)
1781 pr_info("sysfs link creation failed\n");
1782
1783 result = sysfs_create_link(kobj: &device->cooling_dev->device.kobj,
1784 target: &device->dev->dev.kobj, name: "device");
1785 if (result)
1786 pr_info("Reverse sysfs link creation failed\n");
1787}
1788
1789static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video)
1790{
1791 struct acpi_video_device *dev;
1792 union acpi_object *levels;
1793
1794 mutex_lock(lock: &video->device_list_lock);
1795 list_for_each_entry(dev, &video->video_device_list, entry) {
1796 if (!acpi_video_device_lcd_query_levels(handle: dev->dev->handle, levels: &levels))
1797 kfree(objp: levels);
1798 }
1799 mutex_unlock(lock: &video->device_list_lock);
1800}
1801
1802static bool acpi_video_should_register_backlight(struct acpi_video_device *dev)
1803{
1804 /*
1805 * Do not create backlight device for video output
1806 * device that is not in the enumerated list.
1807 */
1808 if (!acpi_video_device_in_dod(device: dev)) {
1809 dev_dbg(&dev->dev->dev, "not in _DOD list, ignore\n");
1810 return false;
1811 }
1812
1813 if (only_lcd)
1814 return dev->flags.lcd;
1815 return true;
1816}
1817
1818static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1819{
1820 struct acpi_video_device *dev;
1821
1822 if (video->backlight_registered)
1823 return 0;
1824
1825 if (acpi_video_get_backlight_type() != acpi_backlight_video)
1826 return 0;
1827
1828 mutex_lock(lock: &video->device_list_lock);
1829 list_for_each_entry(dev, &video->video_device_list, entry) {
1830 if (acpi_video_should_register_backlight(dev))
1831 acpi_video_dev_register_backlight(device: dev);
1832 }
1833 mutex_unlock(lock: &video->device_list_lock);
1834
1835 video->backlight_registered = true;
1836
1837 video->pm_nb.notifier_call = acpi_video_resume;
1838 video->pm_nb.priority = 0;
1839 return register_pm_notifier(nb: &video->pm_nb);
1840}
1841
1842static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1843{
1844 if (device->backlight) {
1845 backlight_device_unregister(bd: device->backlight);
1846 device->backlight = NULL;
1847 }
1848 if (device->brightness) {
1849 kfree(objp: device->brightness->levels);
1850 kfree(objp: device->brightness);
1851 device->brightness = NULL;
1852 }
1853 if (device->cooling_dev) {
1854 sysfs_remove_link(kobj: &device->dev->dev.kobj, name: "thermal_cooling");
1855 sysfs_remove_link(kobj: &device->cooling_dev->device.kobj, name: "device");
1856 thermal_cooling_device_unregister(device->cooling_dev);
1857 device->cooling_dev = NULL;
1858 }
1859}
1860
1861static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1862{
1863 struct acpi_video_device *dev;
1864 int error;
1865
1866 if (!video->backlight_registered)
1867 return 0;
1868
1869 error = unregister_pm_notifier(nb: &video->pm_nb);
1870
1871 mutex_lock(lock: &video->device_list_lock);
1872 list_for_each_entry(dev, &video->video_device_list, entry)
1873 acpi_video_dev_unregister_backlight(device: dev);
1874 mutex_unlock(lock: &video->device_list_lock);
1875
1876 video->backlight_registered = false;
1877
1878 return error;
1879}
1880
1881static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1882{
1883 acpi_status status;
1884 struct acpi_device *adev = device->dev;
1885
1886 status = acpi_install_notify_handler(device: adev->handle, ACPI_DEVICE_NOTIFY,
1887 handler: acpi_video_device_notify, context: device);
1888 if (ACPI_FAILURE(status))
1889 dev_err(&adev->dev, "Error installing notify handler\n");
1890 else
1891 device->flags.notify = 1;
1892}
1893
1894static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1895{
1896 struct input_dev *input;
1897 struct acpi_video_device *dev;
1898 int error;
1899
1900 video->input = input = input_allocate_device();
1901 if (!input) {
1902 error = -ENOMEM;
1903 goto out;
1904 }
1905
1906 error = acpi_video_bus_start_devices(video);
1907 if (error)
1908 goto err_free_input;
1909
1910 snprintf(buf: video->phys, size: sizeof(video->phys),
1911 fmt: "%s/video/input0", acpi_device_hid(device: video->device));
1912
1913 input->name = acpi_device_name(video->device);
1914 input->phys = video->phys;
1915 input->id.bustype = BUS_HOST;
1916 input->id.product = 0x06;
1917 input->dev.parent = &video->device->dev;
1918 input->evbit[0] = BIT(EV_KEY);
1919 set_bit(KEY_SWITCHVIDEOMODE, addr: input->keybit);
1920 set_bit(KEY_VIDEO_NEXT, addr: input->keybit);
1921 set_bit(KEY_VIDEO_PREV, addr: input->keybit);
1922 set_bit(KEY_BRIGHTNESS_CYCLE, addr: input->keybit);
1923 set_bit(KEY_BRIGHTNESSUP, addr: input->keybit);
1924 set_bit(KEY_BRIGHTNESSDOWN, addr: input->keybit);
1925 set_bit(KEY_BRIGHTNESS_ZERO, addr: input->keybit);
1926 set_bit(KEY_DISPLAY_OFF, addr: input->keybit);
1927
1928 error = input_register_device(input);
1929 if (error)
1930 goto err_stop_dev;
1931
1932 mutex_lock(lock: &video->device_list_lock);
1933 list_for_each_entry(dev, &video->video_device_list, entry)
1934 acpi_video_dev_add_notify_handler(device: dev);
1935 mutex_unlock(lock: &video->device_list_lock);
1936
1937 return 0;
1938
1939err_stop_dev:
1940 acpi_video_bus_stop_devices(video);
1941err_free_input:
1942 input_free_device(dev: input);
1943 video->input = NULL;
1944out:
1945 return error;
1946}
1947
1948static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1949{
1950 if (dev->flags.notify) {
1951 acpi_remove_notify_handler(device: dev->dev->handle, ACPI_DEVICE_NOTIFY,
1952 handler: acpi_video_device_notify);
1953 dev->flags.notify = 0;
1954 }
1955}
1956
1957static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1958{
1959 struct acpi_video_device *dev;
1960
1961 mutex_lock(lock: &video->device_list_lock);
1962 list_for_each_entry(dev, &video->video_device_list, entry)
1963 acpi_video_dev_remove_notify_handler(dev);
1964 mutex_unlock(lock: &video->device_list_lock);
1965
1966 acpi_video_bus_stop_devices(video);
1967 input_unregister_device(video->input);
1968 video->input = NULL;
1969}
1970
1971static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1972{
1973 struct acpi_video_device *dev, *next;
1974
1975 mutex_lock(lock: &video->device_list_lock);
1976 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1977 list_del(entry: &dev->entry);
1978 kfree(objp: dev);
1979 }
1980 mutex_unlock(lock: &video->device_list_lock);
1981
1982 return 0;
1983}
1984
1985static int instance;
1986
1987static int acpi_video_bus_add(struct acpi_device *device)
1988{
1989 struct acpi_video_bus *video;
1990 bool auto_detect;
1991 int error;
1992 acpi_status status;
1993
1994 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1995 start_object: acpi_dev_parent(adev: device)->handle, max_depth: 1,
1996 descending_callback: acpi_video_bus_match, NULL,
1997 context: device, NULL);
1998 if (status == AE_ALREADY_EXISTS) {
1999 pr_info(FW_BUG
2000 "Duplicate ACPI video bus devices for the"
2001 " same VGA controller, please try module "
2002 "parameter \"video.allow_duplicates=1\""
2003 "if the current driver doesn't work.\n");
2004 if (!allow_duplicates)
2005 return -ENODEV;
2006 }
2007
2008 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2009 if (!video)
2010 return -ENOMEM;
2011
2012 /* a hack to fix the duplicate name "VID" problem on T61 */
2013 if (!strcmp(device->pnp.bus_id, "VID")) {
2014 if (instance)
2015 device->pnp.bus_id[3] = '0' + instance;
2016 instance++;
2017 }
2018 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2019 if (!strcmp(device->pnp.bus_id, "VGA")) {
2020 if (instance)
2021 device->pnp.bus_id[3] = '0' + instance;
2022 instance++;
2023 }
2024
2025 video->device = device;
2026 strscpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2027 strscpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2028 device->driver_data = video;
2029
2030 acpi_video_bus_find_cap(video);
2031 error = acpi_video_bus_check(video);
2032 if (error)
2033 goto err_free_video;
2034
2035 mutex_init(&video->device_list_lock);
2036 INIT_LIST_HEAD(list: &video->video_device_list);
2037
2038 error = acpi_video_bus_get_devices(video, device);
2039 if (error)
2040 goto err_put_video;
2041
2042 /*
2043 * HP ZBook Fury 16 G10 requires ACPI video's child devices have _PS0
2044 * evaluated to have functional panel brightness control.
2045 */
2046 acpi_device_fix_up_power_children(adev: device);
2047
2048 pr_info("%s [%s] (multi-head: %s rom: %s post: %s)\n",
2049 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2050 str_yes_no(video->flags.multihead),
2051 str_yes_no(video->flags.rom),
2052 str_yes_no(video->flags.post));
2053 mutex_lock(lock: &video_list_lock);
2054 list_add_tail(new: &video->entry, head: &video_bus_head);
2055 mutex_unlock(lock: &video_list_lock);
2056
2057 /*
2058 * If backlight-type auto-detection is used then a native backlight may
2059 * show up later and this may change the result from video to native.
2060 * Therefor normally the userspace visible /sys/class/backlight device
2061 * gets registered separately by the GPU driver calling
2062 * acpi_video_register_backlight() when an internal panel is detected.
2063 * Register the backlight now when not using auto-detection, so that
2064 * when the kernel cmdline or DMI-quirks are used the backlight will
2065 * get registered even if acpi_video_register_backlight() is not called.
2066 */
2067 acpi_video_run_bcl_for_osi(video);
2068 if (__acpi_video_get_backlight_type(native: false, auto_detect: &auto_detect) == acpi_backlight_video &&
2069 !auto_detect)
2070 acpi_video_bus_register_backlight(video);
2071
2072 error = acpi_video_bus_add_notify_handler(video);
2073 if (error)
2074 goto err_del;
2075
2076 error = acpi_dev_install_notify_handler(adev: device, ACPI_DEVICE_NOTIFY,
2077 handler: acpi_video_bus_notify, context: device);
2078 if (error)
2079 goto err_remove;
2080
2081 return 0;
2082
2083err_remove:
2084 acpi_video_bus_remove_notify_handler(video);
2085err_del:
2086 mutex_lock(lock: &video_list_lock);
2087 list_del(entry: &video->entry);
2088 mutex_unlock(lock: &video_list_lock);
2089 acpi_video_bus_unregister_backlight(video);
2090err_put_video:
2091 acpi_video_bus_put_devices(video);
2092 kfree(objp: video->attached_array);
2093err_free_video:
2094 kfree(objp: video);
2095 device->driver_data = NULL;
2096
2097 return error;
2098}
2099
2100static void acpi_video_bus_remove(struct acpi_device *device)
2101{
2102 struct acpi_video_bus *video = NULL;
2103
2104
2105 if (!device || !acpi_driver_data(d: device))
2106 return;
2107
2108 video = acpi_driver_data(d: device);
2109
2110 acpi_dev_remove_notify_handler(adev: device, ACPI_DEVICE_NOTIFY,
2111 handler: acpi_video_bus_notify);
2112
2113 mutex_lock(lock: &video_list_lock);
2114 list_del(entry: &video->entry);
2115 mutex_unlock(lock: &video_list_lock);
2116
2117 acpi_video_bus_remove_notify_handler(video);
2118 acpi_video_bus_unregister_backlight(video);
2119 acpi_video_bus_put_devices(video);
2120
2121 kfree(objp: video->attached_array);
2122 kfree(objp: video);
2123}
2124
2125static int __init is_i740(struct pci_dev *dev)
2126{
2127 if (dev->device == 0x00D1)
2128 return 1;
2129 if (dev->device == 0x7000)
2130 return 1;
2131 return 0;
2132}
2133
2134static int __init intel_opregion_present(void)
2135{
2136 int opregion = 0;
2137 struct pci_dev *dev = NULL;
2138 u32 address;
2139
2140 for_each_pci_dev(dev) {
2141 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2142 continue;
2143 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2144 continue;
2145 /* We don't want to poke around undefined i740 registers */
2146 if (is_i740(dev))
2147 continue;
2148 pci_read_config_dword(dev, where: 0xfc, val: &address);
2149 if (!address)
2150 continue;
2151 opregion = 1;
2152 }
2153 return opregion;
2154}
2155
2156int acpi_video_register(void)
2157{
2158 int ret = 0;
2159
2160 mutex_lock(lock: &register_count_mutex);
2161 if (register_count) {
2162 /*
2163 * if the function of acpi_video_register is already called,
2164 * don't register the acpi_video_bus again and return no error.
2165 */
2166 goto leave;
2167 }
2168
2169 dmi_check_system(list: video_dmi_table);
2170
2171 ret = acpi_bus_register_driver(&acpi_video_bus);
2172 if (ret)
2173 goto leave;
2174
2175 /*
2176 * When the acpi_video_bus is loaded successfully, increase
2177 * the counter reference.
2178 */
2179 register_count = 1;
2180
2181leave:
2182 mutex_unlock(lock: &register_count_mutex);
2183 return ret;
2184}
2185EXPORT_SYMBOL(acpi_video_register);
2186
2187void acpi_video_unregister(void)
2188{
2189 mutex_lock(lock: &register_count_mutex);
2190 if (register_count) {
2191 acpi_bus_unregister_driver(driver: &acpi_video_bus);
2192 register_count = 0;
2193 may_report_brightness_keys = false;
2194 }
2195 mutex_unlock(lock: &register_count_mutex);
2196}
2197EXPORT_SYMBOL(acpi_video_unregister);
2198
2199void acpi_video_register_backlight(void)
2200{
2201 struct acpi_video_bus *video;
2202
2203 mutex_lock(lock: &video_list_lock);
2204 list_for_each_entry(video, &video_bus_head, entry)
2205 acpi_video_bus_register_backlight(video);
2206 mutex_unlock(lock: &video_list_lock);
2207}
2208EXPORT_SYMBOL(acpi_video_register_backlight);
2209
2210bool acpi_video_handles_brightness_key_presses(void)
2211{
2212 return may_report_brightness_keys &&
2213 (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS);
2214}
2215EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses);
2216
2217/*
2218 * This is kind of nasty. Hardware using Intel chipsets may require
2219 * the video opregion code to be run first in order to initialise
2220 * state before any ACPI video calls are made. To handle this we defer
2221 * registration of the video class until the opregion code has run.
2222 */
2223
2224static int __init acpi_video_init(void)
2225{
2226 /*
2227 * Let the module load even if ACPI is disabled (e.g. due to
2228 * a broken BIOS) so that i915.ko can still be loaded on such
2229 * old systems without an AcpiOpRegion.
2230 *
2231 * acpi_video_register() will report -ENODEV later as well due
2232 * to acpi_disabled when i915.ko tries to register itself afterwards.
2233 */
2234 if (acpi_disabled)
2235 return 0;
2236
2237 if (intel_opregion_present())
2238 return 0;
2239
2240 return acpi_video_register();
2241}
2242
2243static void __exit acpi_video_exit(void)
2244{
2245 acpi_video_unregister();
2246}
2247
2248module_init(acpi_video_init);
2249module_exit(acpi_video_exit);
2250