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printf: Remove unused 'bprintf'
[drm/drm-misc.git] / drivers / acpi / acpi_video.c
blob8274a17872ed31de9257d5d048f0fbbee03add95
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
36 MODULE_AUTHOR("Bruno Ducrot");
37 MODULE_DESCRIPTION("ACPI Video Driver");
38 MODULE_LICENSE("GPL");
39
40 static bool brightness_switch_enabled = true;
41 module_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 */
47 static bool allow_duplicates;
48 module_param(allow_duplicates, bool, 0644);
49
50 #define REPORT_OUTPUT_KEY_EVENTS 0x01
51 #define REPORT_BRIGHTNESS_KEY_EVENTS 0x02
52 static int report_key_events = -1;
53 module_param(report_key_events, int, 0644);
54 MODULE_PARM_DESC(report_key_events,
55 "0: none, 1: output changes, 2: brightness changes, 3: all");
56
57 static int hw_changes_brightness = -1;
58 module_param(hw_changes_brightness, int, 0644);
59 MODULE_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 */
67 static bool device_id_scheme = false;
68 module_param(device_id_scheme, bool, 0444);
69
70 static int only_lcd;
71 module_param(only_lcd, int, 0444);
72
73 static bool may_report_brightness_keys;
74 static int register_count;
75 static DEFINE_MUTEX(register_count_mutex);
76 static DEFINE_MUTEX(video_list_lock);
77 static LIST_HEAD(video_bus_head);
78 static int acpi_video_bus_add(struct acpi_device *device);
79 static void acpi_video_bus_remove(struct acpi_device *device);
80 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data);
81
82 /*
83 * Indices in the _BCL method response: the first two items are special,
84 * the rest are all supported levels.
85 *
86 * See page 575 of the ACPI spec 3.0
87 */
88 enum acpi_video_level_idx {
89 ACPI_VIDEO_AC_LEVEL, /* level when machine has full power */
90 ACPI_VIDEO_BATTERY_LEVEL, /* level when machine is on batteries */
91 ACPI_VIDEO_FIRST_LEVEL, /* actual supported levels begin here */
92 };
93
94 static const struct acpi_device_id video_device_ids[] = {
95 {ACPI_VIDEO_HID, 0},
96 {"", 0},
97 };
98 MODULE_DEVICE_TABLE(acpi, video_device_ids);
99
100 static struct acpi_driver acpi_video_bus = {
101 .name = "video",
102 .class = ACPI_VIDEO_CLASS,
103 .ids = video_device_ids,
104 .ops = {
105 .add = acpi_video_bus_add,
106 .remove = acpi_video_bus_remove,
107 },
108 };
109
110 struct acpi_video_bus_flags {
111 u8 multihead:1; /* can switch video heads */
112 u8 rom:1; /* can retrieve a video rom */
113 u8 post:1; /* can configure the head to */
114 u8 reserved:5;
115 };
116
117 struct acpi_video_bus_cap {
118 u8 _DOS:1; /* Enable/Disable output switching */
119 u8 _DOD:1; /* Enumerate all devices attached to display adapter */
120 u8 _ROM:1; /* Get ROM Data */
121 u8 _GPD:1; /* Get POST Device */
122 u8 _SPD:1; /* Set POST Device */
123 u8 _VPO:1; /* Video POST Options */
124 u8 reserved:2;
125 };
126
127 struct acpi_video_device_attrib {
128 u32 display_index:4; /* A zero-based instance of the Display */
129 u32 display_port_attachment:4; /* This field differentiates the display type */
130 u32 display_type:4; /* Describe the specific type in use */
131 u32 vendor_specific:4; /* Chipset Vendor Specific */
132 u32 bios_can_detect:1; /* BIOS can detect the device */
133 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to
134 the VGA device. */
135 u32 pipe_id:3; /* For VGA multiple-head devices. */
136 u32 reserved:10; /* Must be 0 */
137
138 /*
139 * The device ID might not actually follow the scheme described by this
140 * struct acpi_video_device_attrib. If it does, then this bit
141 * device_id_scheme is set; otherwise, other fields should be ignored.
142 *
143 * (but also see the global flag device_id_scheme)
144 */
145 u32 device_id_scheme:1;
146 };
147
148 struct acpi_video_enumerated_device {
149 union {
150 u32 int_val;
151 struct acpi_video_device_attrib attrib;
152 } value;
153 struct acpi_video_device *bind_info;
154 };
155
156 struct acpi_video_bus {
157 struct acpi_device *device;
158 bool backlight_registered;
159 u8 dos_setting;
160 struct acpi_video_enumerated_device *attached_array;
161 u8 attached_count;
162 u8 child_count;
163 struct acpi_video_bus_cap cap;
164 struct acpi_video_bus_flags flags;
165 struct list_head video_device_list;
166 struct mutex device_list_lock; /* protects video_device_list */
167 struct list_head entry;
168 struct input_dev *input;
169 char phys[32]; /* for input device */
170 struct notifier_block pm_nb;
171 };
172
173 struct acpi_video_device_flags {
174 u8 crt:1;
175 u8 lcd:1;
176 u8 tvout:1;
177 u8 dvi:1;
178 u8 bios:1;
179 u8 unknown:1;
180 u8 notify:1;
181 u8 reserved:1;
182 };
183
184 struct acpi_video_device_cap {
185 u8 _ADR:1; /* Return the unique ID */
186 u8 _BCL:1; /* Query list of brightness control levels supported */
187 u8 _BCM:1; /* Set the brightness level */
188 u8 _BQC:1; /* Get current brightness level */
189 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
190 u8 _DDC:1; /* Return the EDID for this device */
191 };
192
193 struct acpi_video_device {
194 unsigned long device_id;
195 struct acpi_video_device_flags flags;
196 struct acpi_video_device_cap cap;
197 struct list_head entry;
198 struct delayed_work switch_brightness_work;
199 int switch_brightness_event;
200 struct acpi_video_bus *video;
201 struct acpi_device *dev;
202 struct acpi_video_device_brightness *brightness;
203 struct backlight_device *backlight;
204 struct thermal_cooling_device *cooling_dev;
205 };
206
207 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
208 static void acpi_video_device_rebind(struct acpi_video_bus *video);
209 static void acpi_video_device_bind(struct acpi_video_bus *video,
210 struct acpi_video_device *device);
211 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
212 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
213 int level);
214 static int acpi_video_device_lcd_get_level_current(
215 struct acpi_video_device *device,
216 unsigned long long *level, bool raw);
217 static int acpi_video_get_next_level(struct acpi_video_device *device,
218 u32 level_current, u32 event);
219 static void acpi_video_switch_brightness(struct work_struct *work);
220
221 /* backlight device sysfs support */
222 static int acpi_video_get_brightness(struct backlight_device *bd)
223 {
224 unsigned long long cur_level;
225 int i;
226 struct acpi_video_device *vd = bl_get_data(bd);
227
228 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
229 return -EINVAL;
230 for (i = ACPI_VIDEO_FIRST_LEVEL; i < vd->brightness->count; i++) {
231 if (vd->brightness->levels[i] == cur_level)
232 return i - ACPI_VIDEO_FIRST_LEVEL;
233 }
234 return 0;
235 }
236
237 static int acpi_video_set_brightness(struct backlight_device *bd)
238 {
239 int request_level = bd->props.brightness + ACPI_VIDEO_FIRST_LEVEL;
240 struct acpi_video_device *vd = bl_get_data(bd);
241
242 cancel_delayed_work(&vd->switch_brightness_work);
243 return acpi_video_device_lcd_set_level(vd,
244 vd->brightness->levels[request_level]);
245 }
246
247 static const struct backlight_ops acpi_backlight_ops = {
248 .get_brightness = acpi_video_get_brightness,
249 .update_status = acpi_video_set_brightness,
250 };
251
252 /* thermal cooling device callbacks */
253 static int video_get_max_state(struct thermal_cooling_device *cooling_dev,
254 unsigned long *state)
255 {
256 struct acpi_video_device *video = cooling_dev->devdata;
257
258 *state = video->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1;
259 return 0;
260 }
261
262 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev,
263 unsigned long *state)
264 {
265 struct acpi_video_device *video = cooling_dev->devdata;
266 unsigned long long level;
267 int offset;
268
269 if (acpi_video_device_lcd_get_level_current(video, &level, false))
270 return -EINVAL;
271 for (offset = ACPI_VIDEO_FIRST_LEVEL; offset < video->brightness->count;
272 offset++)
273 if (level == video->brightness->levels[offset]) {
274 *state = video->brightness->count - offset - 1;
275 return 0;
276 }
277
278 return -EINVAL;
279 }
280
281 static int
282 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
283 {
284 struct acpi_video_device *video = cooling_dev->devdata;
285 int level;
286
287 if (state >= video->brightness->count - ACPI_VIDEO_FIRST_LEVEL)
288 return -EINVAL;
289
290 state = video->brightness->count - state;
291 level = video->brightness->levels[state - 1];
292 return acpi_video_device_lcd_set_level(video, level);
293 }
294
295 static const struct thermal_cooling_device_ops video_cooling_ops = {
296 .get_max_state = video_get_max_state,
297 .get_cur_state = video_get_cur_state,
298 .set_cur_state = video_set_cur_state,
299 };
300
301 /*
302 * --------------------------------------------------------------------------
303 * Video Management
304 * --------------------------------------------------------------------------
305 */
306
307 static int
308 acpi_video_device_lcd_query_levels(acpi_handle handle,
309 union acpi_object **levels)
310 {
311 int status;
312 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
313 union acpi_object *obj;
314
315
316 *levels = NULL;
317
318 status = acpi_evaluate_object(handle, "_BCL", NULL, &buffer);
319 if (ACPI_FAILURE(status))
320 return status;
321 obj = (union acpi_object *)buffer.pointer;
322 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
323 acpi_handle_info(handle, "Invalid _BCL data\n");
324 status = -EFAULT;
325 goto err;
326 }
327
328 *levels = obj;
329
330 return 0;
331
332 err:
333 kfree(buffer.pointer);
334
335 return status;
336 }
337
338 static int
339 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
340 {
341 int status;
342 int state;
343
344 status = acpi_execute_simple_method(device->dev->handle,
345 "_BCM", level);
346 if (ACPI_FAILURE(status)) {
347 acpi_handle_info(device->dev->handle, "_BCM evaluation failed\n");
348 return -EIO;
349 }
350
351 device->brightness->curr = level;
352 for (state = ACPI_VIDEO_FIRST_LEVEL; state < device->brightness->count;
353 state++)
354 if (level == device->brightness->levels[state]) {
355 if (device->backlight)
356 device->backlight->props.brightness =
357 state - ACPI_VIDEO_FIRST_LEVEL;
358 return 0;
359 }
360
361 acpi_handle_info(device->dev->handle, "Current brightness invalid\n");
362 return -EINVAL;
363 }
364
365 /*
366 * For some buggy _BQC methods, we need to add a constant value to
367 * the _BQC return value to get the actual current brightness level
368 */
369
370 static int bqc_offset_aml_bug_workaround;
371 static int video_set_bqc_offset(const struct dmi_system_id *d)
372 {
373 bqc_offset_aml_bug_workaround = 9;
374 return 0;
375 }
376
377 static int video_set_device_id_scheme(const struct dmi_system_id *d)
378 {
379 device_id_scheme = true;
380 return 0;
381 }
382
383 static int video_enable_only_lcd(const struct dmi_system_id *d)
384 {
385 only_lcd = true;
386 return 0;
387 }
388
389 static int video_set_report_key_events(const struct dmi_system_id *id)
390 {
391 if (report_key_events == -1)
392 report_key_events = (uintptr_t)id->driver_data;
393 return 0;
394 }
395
396 static int video_hw_changes_brightness(
397 const struct dmi_system_id *d)
398 {
399 if (hw_changes_brightness == -1)
400 hw_changes_brightness = 1;
401 return 0;
402 }
403
404 static const struct dmi_system_id video_dmi_table[] = {
405 /*
406 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
407 */
408 {
409 .callback = video_set_bqc_offset,
410 .ident = "Acer Aspire 5720",
411 .matches = {
412 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
413 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
414 },
415 },
416 {
417 .callback = video_set_bqc_offset,
418 .ident = "Acer Aspire 5710Z",
419 .matches = {
420 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
421 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
422 },
423 },
424 {
425 .callback = video_set_bqc_offset,
426 .ident = "eMachines E510",
427 .matches = {
428 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
429 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
430 },
431 },
432 {
433 .callback = video_set_bqc_offset,
434 .ident = "Acer Aspire 5315",
435 .matches = {
436 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
437 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
438 },
439 },
440 {
441 .callback = video_set_bqc_offset,
442 .ident = "Acer Aspire 7720",
443 .matches = {
444 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
445 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
446 },
447 },
448
449 /*
450 * Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set
451 * but the IDs actually follow the Device ID Scheme.
452 */
453 {
454 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
455 .callback = video_set_device_id_scheme,
456 .ident = "ESPRIMO Mobile M9410",
457 .matches = {
458 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
459 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
460 },
461 },
462 /*
463 * Some machines have multiple video output devices, but only the one
464 * that is the type of LCD can do the backlight control so we should not
465 * register backlight interface for other video output devices.
466 */
467 {
468 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
469 .callback = video_enable_only_lcd,
470 .ident = "ESPRIMO Mobile M9410",
471 .matches = {
472 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
473 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
474 },
475 },
476 /*
477 * Some machines report wrong key events on the acpi-bus, suppress
478 * key event reporting on these. Note this is only intended to work
479 * around events which are plain wrong. In some cases we get double
480 * events, in this case acpi-video is considered the canonical source
481 * and the events from the other source should be filtered. E.g.
482 * by calling acpi_video_handles_brightness_key_presses() from the
483 * vendor acpi/wmi driver or by using /lib/udev/hwdb.d/60-keyboard.hwdb
484 */
485 {
486 .callback = video_set_report_key_events,
487 .driver_data = (void *)((uintptr_t)REPORT_OUTPUT_KEY_EVENTS),
488 .ident = "Dell Vostro V131",
489 .matches = {
490 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
491 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
492 },
493 },
494 {
495 .callback = video_set_report_key_events,
496 .driver_data = (void *)((uintptr_t)REPORT_BRIGHTNESS_KEY_EVENTS),
497 .ident = "Dell Vostro 3350",
498 .matches = {
499 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
500 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3350"),
501 },
502 },
503 {
504 .callback = video_set_report_key_events,
505 .driver_data = (void *)((uintptr_t)REPORT_BRIGHTNESS_KEY_EVENTS),
506 .ident = "COLORFUL X15 AT 23",
507 .matches = {
508 DMI_MATCH(DMI_SYS_VENDOR, "COLORFUL"),
509 DMI_MATCH(DMI_PRODUCT_NAME, "X15 AT 23"),
510 },
511 },
512 /*
513 * Some machines change the brightness themselves when a brightness
514 * hotkey gets pressed, despite us telling them not to. In this case
515 * acpi_video_device_notify() should only call backlight_force_update(
516 * BACKLIGHT_UPDATE_HOTKEY) and not do anything else.
517 */
518 {
519 /* https://bugzilla.kernel.org/show_bug.cgi?id=204077 */
520 .callback = video_hw_changes_brightness,
521 .ident = "Packard Bell EasyNote MZ35",
522 .matches = {
523 DMI_MATCH(DMI_SYS_VENDOR, "Packard Bell"),
524 DMI_MATCH(DMI_PRODUCT_NAME, "EasyNote MZ35"),
525 },
526 },
527 {}
528 };
529
530 static unsigned long long
531 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
532 unsigned long long bqc_value)
533 {
534 unsigned long long level;
535
536 if (device->brightness->flags._BQC_use_index) {
537 /*
538 * _BQC returns an index that doesn't account for the first 2
539 * items with special meaning (see enum acpi_video_level_idx),
540 * so we need to compensate for that by offsetting ourselves
541 */
542 if (device->brightness->flags._BCL_reversed)
543 bqc_value = device->brightness->count -
544 ACPI_VIDEO_FIRST_LEVEL - 1 - bqc_value;
545
546 level = device->brightness->levels[bqc_value +
547 ACPI_VIDEO_FIRST_LEVEL];
548 } else {
549 level = bqc_value;
550 }
551
552 level += bqc_offset_aml_bug_workaround;
553
554 return level;
555 }
556
557 static int
558 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
559 unsigned long long *level, bool raw)
560 {
561 acpi_status status = AE_OK;
562 int i;
563
564 if (device->cap._BQC || device->cap._BCQ) {
565 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
566
567 status = acpi_evaluate_integer(device->dev->handle, buf,
568 NULL, level);
569 if (ACPI_SUCCESS(status)) {
570 if (raw) {
571 /*
572 * Caller has indicated he wants the raw
573 * value returned by _BQC, so don't furtherly
574 * mess with the value.
575 */
576 return 0;
577 }
578
579 *level = acpi_video_bqc_value_to_level(device, *level);
580
581 for (i = ACPI_VIDEO_FIRST_LEVEL;
582 i < device->brightness->count; i++)
583 if (device->brightness->levels[i] == *level) {
584 device->brightness->curr = *level;
585 return 0;
586 }
587 /*
588 * BQC returned an invalid level.
589 * Stop using it.
590 */
591 acpi_handle_info(device->dev->handle,
592 "%s returned an invalid level", buf);
593 device->cap._BQC = device->cap._BCQ = 0;
594 } else {
595 /*
596 * Fixme:
597 * should we return an error or ignore this failure?
598 * dev->brightness->curr is a cached value which stores
599 * the correct current backlight level in most cases.
600 * ACPI video backlight still works w/ buggy _BQC.
601 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
602 */
603 acpi_handle_info(device->dev->handle,
604 "%s evaluation failed", buf);
605 device->cap._BQC = device->cap._BCQ = 0;
606 }
607 }
608
609 *level = device->brightness->curr;
610 return 0;
611 }
612
613 static int
614 acpi_video_device_EDID(struct acpi_video_device *device,
615 union acpi_object **edid, int length)
616 {
617 int status;
618 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
619 union acpi_object *obj;
620 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
621 struct acpi_object_list args = { 1, &arg0 };
622
623
624 *edid = NULL;
625
626 if (!device)
627 return -ENODEV;
628 if (!length || (length % 128))
629 return -EINVAL;
630
631 arg0.integer.value = length / 128;
632
633 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
634 if (ACPI_FAILURE(status))
635 return -ENODEV;
636
637 obj = buffer.pointer;
638
639 if (obj && obj->type == ACPI_TYPE_BUFFER)
640 *edid = obj;
641 else {
642 acpi_handle_debug(device->dev->handle,
643 "Invalid _DDC data for length %d\n", length);
644 status = -EFAULT;
645 kfree(obj);
646 }
647
648 return status;
649 }
650
651 /* bus */
652
653 /*
654 * Arg:
655 * video : video bus device pointer
656 * bios_flag :
657 * 0. The system BIOS should NOT automatically switch(toggle)
658 * the active display output.
659 * 1. The system BIOS should automatically switch (toggle) the
660 * active display output. No switch event.
661 * 2. The _DGS value should be locked.
662 * 3. The system BIOS should not automatically switch (toggle) the
663 * active display output, but instead generate the display switch
664 * event notify code.
665 * lcd_flag :
666 * 0. The system BIOS should automatically control the brightness level
667 * of the LCD when:
668 * - the power changes from AC to DC (ACPI appendix B)
669 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs)
670 * 1. The system BIOS should NOT automatically control the brightness
671 * level of the LCD when:
672 * - the power changes from AC to DC (ACPI appendix B)
673 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs)
674 * Return Value:
675 * -EINVAL wrong arg.
676 */
677
678 static int
679 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
680 {
681 acpi_status status;
682
683 if (!video->cap._DOS)
684 return 0;
685
686 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
687 return -EINVAL;
688 video->dos_setting = (lcd_flag << 2) | bios_flag;
689 status = acpi_execute_simple_method(video->device->handle, "_DOS",
690 (lcd_flag << 2) | bios_flag);
691 if (ACPI_FAILURE(status))
692 return -EIO;
693
694 return 0;
695 }
696
697 /*
698 * Simple comparison function used to sort backlight levels.
699 */
700
701 static int
702 acpi_video_cmp_level(const void *a, const void *b)
703 {
704 return *(int *)a - *(int *)b;
705 }
706
707 /*
708 * Decides if _BQC/_BCQ for this system is usable
709 *
710 * We do this by changing the level first and then read out the current
711 * brightness level, if the value does not match, find out if it is using
712 * index. If not, clear the _BQC/_BCQ capability.
713 */
714 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
715 int max_level, int current_level)
716 {
717 struct acpi_video_device_brightness *br = device->brightness;
718 int result;
719 unsigned long long level;
720 int test_level;
721
722 /* don't mess with existing known broken systems */
723 if (bqc_offset_aml_bug_workaround)
724 return 0;
725
726 /*
727 * Some systems always report current brightness level as maximum
728 * through _BQC, we need to test another value for them. However,
729 * there is a subtlety:
730 *
731 * If the _BCL package ordering is descending, the first level
732 * (br->levels[2]) is likely to be 0, and if the number of levels
733 * matches the number of steps, we might confuse a returned level to
734 * mean the index.
735 *
736 * For example:
737 *
738 * current_level = max_level = 100
739 * test_level = 0
740 * returned level = 100
741 *
742 * In this case 100 means the level, not the index, and _BCM failed.
743 * Still, if the _BCL package ordering is descending, the index of
744 * level 0 is also 100, so we assume _BQC is indexed, when it's not.
745 *
746 * This causes all _BQC calls to return bogus values causing weird
747 * behavior from the user's perspective. For example:
748 *
749 * xbacklight -set 10; xbacklight -set 20;
750 *
751 * would flash to 90% and then slowly down to the desired level (20).
752 *
753 * The solution is simple; test anything other than the first level
754 * (e.g. 1).
755 */
756 test_level = current_level == max_level
757 ? br->levels[ACPI_VIDEO_FIRST_LEVEL + 1]
758 : max_level;
759
760 result = acpi_video_device_lcd_set_level(device, test_level);
761 if (result)
762 return result;
763
764 result = acpi_video_device_lcd_get_level_current(device, &level, true);
765 if (result)
766 return result;
767
768 if (level != test_level) {
769 /* buggy _BQC found, need to find out if it uses index */
770 if (level < br->count) {
771 if (br->flags._BCL_reversed)
772 level = br->count - ACPI_VIDEO_FIRST_LEVEL - 1 - level;
773 if (br->levels[level + ACPI_VIDEO_FIRST_LEVEL] == test_level)
774 br->flags._BQC_use_index = 1;
775 }
776
777 if (!br->flags._BQC_use_index)
778 device->cap._BQC = device->cap._BCQ = 0;
779 }
780
781 return 0;
782 }
783
784 int acpi_video_get_levels(struct acpi_device *device,
785 struct acpi_video_device_brightness **dev_br,
786 int *pmax_level)
787 {
788 union acpi_object *obj = NULL;
789 int i, max_level = 0, count = 0, level_ac_battery = 0;
790 union acpi_object *o;
791 struct acpi_video_device_brightness *br = NULL;
792 int result = 0;
793 u32 value;
794
795 if (ACPI_FAILURE(acpi_video_device_lcd_query_levels(device->handle, &obj))) {
796 acpi_handle_debug(device->handle,
797 "Could not query available LCD brightness level\n");
798 result = -ENODEV;
799 goto out;
800 }
801
802 if (obj->package.count < ACPI_VIDEO_FIRST_LEVEL) {
803 result = -EINVAL;
804 goto out;
805 }
806
807 br = kzalloc(sizeof(*br), GFP_KERNEL);
808 if (!br) {
809 result = -ENOMEM;
810 goto out;
811 }
812
813 /*
814 * Note that we have to reserve 2 extra items (ACPI_VIDEO_FIRST_LEVEL),
815 * in order to account for buggy BIOS which don't export the first two
816 * special levels (see below)
817 */
818 br->levels = kmalloc_array(obj->package.count + ACPI_VIDEO_FIRST_LEVEL,
819 sizeof(*br->levels),
820 GFP_KERNEL);
821 if (!br->levels) {
822 result = -ENOMEM;
823 goto out_free;
824 }
825
826 for (i = 0; i < obj->package.count; i++) {
827 o = (union acpi_object *)&obj->package.elements[i];
828 if (o->type != ACPI_TYPE_INTEGER) {
829 acpi_handle_info(device->handle, "Invalid data\n");
830 continue;
831 }
832 value = (u32) o->integer.value;
833 /* Skip duplicate entries */
834 if (count > ACPI_VIDEO_FIRST_LEVEL
835 && br->levels[count - 1] == value)
836 continue;
837
838 br->levels[count] = value;
839
840 if (br->levels[count] > max_level)
841 max_level = br->levels[count];
842 count++;
843 }
844
845 /*
846 * some buggy BIOS don't export the levels
847 * when machine is on AC/Battery in _BCL package.
848 * In this case, the first two elements in _BCL packages
849 * are also supported brightness levels that OS should take care of.
850 */
851 for (i = ACPI_VIDEO_FIRST_LEVEL; i < count; i++) {
852 if (br->levels[i] == br->levels[ACPI_VIDEO_AC_LEVEL])
853 level_ac_battery++;
854 if (br->levels[i] == br->levels[ACPI_VIDEO_BATTERY_LEVEL])
855 level_ac_battery++;
856 }
857
858 if (level_ac_battery < ACPI_VIDEO_FIRST_LEVEL) {
859 level_ac_battery = ACPI_VIDEO_FIRST_LEVEL - level_ac_battery;
860 br->flags._BCL_no_ac_battery_levels = 1;
861 for (i = (count - 1 + level_ac_battery);
862 i >= ACPI_VIDEO_FIRST_LEVEL; i--)
863 br->levels[i] = br->levels[i - level_ac_battery];
864 count += level_ac_battery;
865 } else if (level_ac_battery > ACPI_VIDEO_FIRST_LEVEL)
866 acpi_handle_info(device->handle,
867 "Too many duplicates in _BCL package");
868
869 /* Check if the _BCL package is in a reversed order */
870 if (max_level == br->levels[ACPI_VIDEO_FIRST_LEVEL]) {
871 br->flags._BCL_reversed = 1;
872 sort(&br->levels[ACPI_VIDEO_FIRST_LEVEL],
873 count - ACPI_VIDEO_FIRST_LEVEL,
874 sizeof(br->levels[ACPI_VIDEO_FIRST_LEVEL]),
875 acpi_video_cmp_level, NULL);
876 } else if (max_level != br->levels[count - 1])
877 acpi_handle_info(device->handle,
878 "Found unordered _BCL package");
879
880 br->count = count;
881 *dev_br = br;
882 if (pmax_level)
883 *pmax_level = max_level;
884
885 out:
886 kfree(obj);
887 return result;
888 out_free:
889 kfree(br);
890 goto out;
891 }
892 EXPORT_SYMBOL(acpi_video_get_levels);
893
894 /*
895 * Arg:
896 * device : video output device (LCD, CRT, ..)
897 *
898 * Return Value:
899 * Maximum brightness level
900 *
901 * Allocate and initialize device->brightness.
902 */
903
904 static int
905 acpi_video_init_brightness(struct acpi_video_device *device)
906 {
907 int i, max_level = 0;
908 unsigned long long level, level_old;
909 struct acpi_video_device_brightness *br = NULL;
910 int result;
911
912 result = acpi_video_get_levels(device->dev, &br, &max_level);
913 if (result)
914 return result;
915 device->brightness = br;
916
917 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
918 br->curr = level = max_level;
919
920 if (!device->cap._BQC)
921 goto set_level;
922
923 result = acpi_video_device_lcd_get_level_current(device,
924 &level_old, true);
925 if (result)
926 goto out_free_levels;
927
928 result = acpi_video_bqc_quirk(device, max_level, level_old);
929 if (result)
930 goto out_free_levels;
931 /*
932 * cap._BQC may get cleared due to _BQC is found to be broken
933 * in acpi_video_bqc_quirk, so check again here.
934 */
935 if (!device->cap._BQC)
936 goto set_level;
937
938 level = acpi_video_bqc_value_to_level(device, level_old);
939 /*
940 * On some buggy laptops, _BQC returns an uninitialized
941 * value when invoked for the first time, i.e.
942 * level_old is invalid (no matter whether it's a level
943 * or an index). Set the backlight to max_level in this case.
944 */
945 for (i = ACPI_VIDEO_FIRST_LEVEL; i < br->count; i++)
946 if (level == br->levels[i])
947 break;
948 if (i == br->count || !level)
949 level = max_level;
950
951 set_level:
952 result = acpi_video_device_lcd_set_level(device, level);
953 if (result)
954 goto out_free_levels;
955
956 acpi_handle_debug(device->dev->handle, "found %d brightness levels\n",
957 br->count - ACPI_VIDEO_FIRST_LEVEL);
958
959 return 0;
960
961 out_free_levels:
962 kfree(br->levels);
963 kfree(br);
964 device->brightness = NULL;
965 return result;
966 }
967
968 /*
969 * Arg:
970 * device : video output device (LCD, CRT, ..)
971 *
972 * Return Value:
973 * None
974 *
975 * Find out all required AML methods defined under the output
976 * device.
977 */
978
979 static void acpi_video_device_find_cap(struct acpi_video_device *device)
980 {
981 if (acpi_has_method(device->dev->handle, "_ADR"))
982 device->cap._ADR = 1;
983 if (acpi_has_method(device->dev->handle, "_BCL"))
984 device->cap._BCL = 1;
985 if (acpi_has_method(device->dev->handle, "_BCM"))
986 device->cap._BCM = 1;
987 if (acpi_has_method(device->dev->handle, "_BQC")) {
988 device->cap._BQC = 1;
989 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
990 acpi_handle_info(device->dev->handle,
991 "_BCQ is used instead of _BQC\n");
992 device->cap._BCQ = 1;
993 }
994
995 if (acpi_has_method(device->dev->handle, "_DDC"))
996 device->cap._DDC = 1;
997 }
998
999 /*
1000 * Arg:
1001 * device : video output device (VGA)
1002 *
1003 * Return Value:
1004 * None
1005 *
1006 * Find out all required AML methods defined under the video bus device.
1007 */
1008
1009 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1010 {
1011 if (acpi_has_method(video->device->handle, "_DOS"))
1012 video->cap._DOS = 1;
1013 if (acpi_has_method(video->device->handle, "_DOD"))
1014 video->cap._DOD = 1;
1015 if (acpi_has_method(video->device->handle, "_ROM"))
1016 video->cap._ROM = 1;
1017 if (acpi_has_method(video->device->handle, "_GPD"))
1018 video->cap._GPD = 1;
1019 if (acpi_has_method(video->device->handle, "_SPD"))
1020 video->cap._SPD = 1;
1021 if (acpi_has_method(video->device->handle, "_VPO"))
1022 video->cap._VPO = 1;
1023 }
1024
1025 /*
1026 * Check whether the video bus device has required AML method to
1027 * support the desired features
1028 */
1029
1030 static int acpi_video_bus_check(struct acpi_video_bus *video)
1031 {
1032 acpi_status status = -ENOENT;
1033 struct pci_dev *dev;
1034
1035 if (!video)
1036 return -EINVAL;
1037
1038 dev = acpi_get_pci_dev(video->device->handle);
1039 if (!dev)
1040 return -ENODEV;
1041 pci_dev_put(dev);
1042
1043 /*
1044 * Since there is no HID, CID and so on for VGA driver, we have
1045 * to check well known required nodes.
1046 */
1047
1048 /* Does this device support video switching? */
1049 if (video->cap._DOS || video->cap._DOD) {
1050 if (!video->cap._DOS) {
1051 pr_info(FW_BUG "ACPI(%s) defines _DOD but not _DOS\n",
1052 acpi_device_bid(video->device));
1053 }
1054 video->flags.multihead = 1;
1055 status = 0;
1056 }
1057
1058 /* Does this device support retrieving a video ROM? */
1059 if (video->cap._ROM) {
1060 video->flags.rom = 1;
1061 status = 0;
1062 }
1063
1064 /* Does this device support configuring which video device to POST? */
1065 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1066 video->flags.post = 1;
1067 status = 0;
1068 }
1069
1070 return status;
1071 }
1072
1073 /*
1074 * --------------------------------------------------------------------------
1075 * Driver Interface
1076 * --------------------------------------------------------------------------
1077 */
1078
1079 /* device interface */
1080 static struct acpi_video_device_attrib *
1081 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1082 {
1083 struct acpi_video_enumerated_device *ids;
1084 int i;
1085
1086 for (i = 0; i < video->attached_count; i++) {
1087 ids = &video->attached_array[i];
1088 if ((ids->value.int_val & 0xffff) == device_id)
1089 return &ids->value.attrib;
1090 }
1091
1092 return NULL;
1093 }
1094
1095 static int
1096 acpi_video_get_device_type(struct acpi_video_bus *video,
1097 unsigned long device_id)
1098 {
1099 struct acpi_video_enumerated_device *ids;
1100 int i;
1101
1102 for (i = 0; i < video->attached_count; i++) {
1103 ids = &video->attached_array[i];
1104 if ((ids->value.int_val & 0xffff) == device_id)
1105 return ids->value.int_val;
1106 }
1107
1108 return 0;
1109 }
1110
1111 static int acpi_video_bus_get_one_device(struct acpi_device *device, void *arg)
1112 {
1113 struct acpi_video_bus *video = arg;
1114 struct acpi_video_device_attrib *attribute;
1115 struct acpi_video_device *data;
1116 unsigned long long device_id;
1117 acpi_status status;
1118 int device_type;
1119
1120 status = acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1121 /* Skip devices without _ADR instead of failing. */
1122 if (ACPI_FAILURE(status))
1123 goto exit;
1124
1125 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1126 if (!data) {
1127 dev_dbg(&device->dev, "Cannot attach\n");
1128 return -ENOMEM;
1129 }
1130
1131 strscpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1132 strscpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1133
1134 data->device_id = device_id;
1135 data->video = video;
1136 data->dev = device;
1137 INIT_DELAYED_WORK(&data->switch_brightness_work,
1138 acpi_video_switch_brightness);
1139
1140 attribute = acpi_video_get_device_attr(video, device_id);
1141
1142 if (attribute && (attribute->device_id_scheme || device_id_scheme)) {
1143 switch (attribute->display_type) {
1144 case ACPI_VIDEO_DISPLAY_CRT:
1145 data->flags.crt = 1;
1146 break;
1147 case ACPI_VIDEO_DISPLAY_TV:
1148 data->flags.tvout = 1;
1149 break;
1150 case ACPI_VIDEO_DISPLAY_DVI:
1151 data->flags.dvi = 1;
1152 break;
1153 case ACPI_VIDEO_DISPLAY_LCD:
1154 data->flags.lcd = 1;
1155 break;
1156 default:
1157 data->flags.unknown = 1;
1158 break;
1159 }
1160 if (attribute->bios_can_detect)
1161 data->flags.bios = 1;
1162 } else {
1163 /* Check for legacy IDs */
1164 device_type = acpi_video_get_device_type(video, device_id);
1165 /* Ignore bits 16 and 18-20 */
1166 switch (device_type & 0xffe2ffff) {
1167 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1168 data->flags.crt = 1;
1169 break;
1170 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1171 data->flags.lcd = 1;
1172 break;
1173 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1174 data->flags.tvout = 1;
1175 break;
1176 default:
1177 data->flags.unknown = 1;
1178 }
1179 }
1180
1181 acpi_video_device_bind(video, data);
1182 acpi_video_device_find_cap(data);
1183
1184 if (data->cap._BCM && data->cap._BCL)
1185 may_report_brightness_keys = true;
1186
1187 mutex_lock(&video->device_list_lock);
1188 list_add_tail(&data->entry, &video->video_device_list);
1189 mutex_unlock(&video->device_list_lock);
1190
1191 exit:
1192 video->child_count++;
1193 return 0;
1194 }
1195
1196 /*
1197 * Arg:
1198 * video : video bus device
1199 *
1200 * Return:
1201 * none
1202 *
1203 * Enumerate the video device list of the video bus,
1204 * bind the ids with the corresponding video devices
1205 * under the video bus.
1206 */
1207
1208 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1209 {
1210 struct acpi_video_device *dev;
1211
1212 mutex_lock(&video->device_list_lock);
1213
1214 list_for_each_entry(dev, &video->video_device_list, entry)
1215 acpi_video_device_bind(video, dev);
1216
1217 mutex_unlock(&video->device_list_lock);
1218 }
1219
1220 /*
1221 * Arg:
1222 * video : video bus device
1223 * device : video output device under the video
1224 * bus
1225 *
1226 * Return:
1227 * none
1228 *
1229 * Bind the ids with the corresponding video devices
1230 * under the video bus.
1231 */
1232
1233 static void
1234 acpi_video_device_bind(struct acpi_video_bus *video,
1235 struct acpi_video_device *device)
1236 {
1237 struct acpi_video_enumerated_device *ids;
1238 int i;
1239
1240 for (i = 0; i < video->attached_count; i++) {
1241 ids = &video->attached_array[i];
1242 if (device->device_id == (ids->value.int_val & 0xffff)) {
1243 ids->bind_info = device;
1244 acpi_handle_debug(video->device->handle, "%s: %d\n",
1245 __func__, i);
1246 }
1247 }
1248 }
1249
1250 static bool acpi_video_device_in_dod(struct acpi_video_device *device)
1251 {
1252 struct acpi_video_bus *video = device->video;
1253 int i;
1254
1255 /*
1256 * If we have a broken _DOD or we have more than 8 output devices
1257 * under the graphics controller node that we can't proper deal with
1258 * in the operation region code currently, no need to test.
1259 */
1260 if (!video->attached_count || video->child_count > 8)
1261 return true;
1262
1263 for (i = 0; i < video->attached_count; i++) {
1264 if ((video->attached_array[i].value.int_val & 0xfff) ==
1265 (device->device_id & 0xfff))
1266 return true;
1267 }
1268
1269 return false;
1270 }
1271
1272 /*
1273 * Arg:
1274 * video : video bus device
1275 *
1276 * Return:
1277 * < 0 : error
1278 *
1279 * Call _DOD to enumerate all devices attached to display adapter
1280 *
1281 */
1282
1283 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1284 {
1285 int status;
1286 int count;
1287 int i;
1288 struct acpi_video_enumerated_device *active_list;
1289 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1290 union acpi_object *dod = NULL;
1291 union acpi_object *obj;
1292
1293 if (!video->cap._DOD)
1294 return AE_NOT_EXIST;
1295
1296 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1297 if (ACPI_FAILURE(status)) {
1298 acpi_handle_info(video->device->handle,
1299 "_DOD evaluation failed: %s\n",
1300 acpi_format_exception(status));
1301 return status;
1302 }
1303
1304 dod = buffer.pointer;
1305 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1306 acpi_handle_info(video->device->handle, "Invalid _DOD data\n");
1307 status = -EFAULT;
1308 goto out;
1309 }
1310
1311 acpi_handle_debug(video->device->handle, "Found %d video heads in _DOD\n",
1312 dod->package.count);
1313
1314 active_list = kcalloc(1 + dod->package.count,
1315 sizeof(struct acpi_video_enumerated_device),
1316 GFP_KERNEL);
1317 if (!active_list) {
1318 status = -ENOMEM;
1319 goto out;
1320 }
1321
1322 count = 0;
1323 for (i = 0; i < dod->package.count; i++) {
1324 obj = &dod->package.elements[i];
1325
1326 if (obj->type != ACPI_TYPE_INTEGER) {
1327 acpi_handle_info(video->device->handle,
1328 "Invalid _DOD data in element %d\n", i);
1329 continue;
1330 }
1331
1332 active_list[count].value.int_val = obj->integer.value;
1333 active_list[count].bind_info = NULL;
1334
1335 acpi_handle_debug(video->device->handle,
1336 "_DOD element[%d] = %d\n", i,
1337 (int)obj->integer.value);
1338
1339 count++;
1340 }
1341
1342 kfree(video->attached_array);
1343
1344 video->attached_array = active_list;
1345 video->attached_count = count;
1346
1347 out:
1348 kfree(buffer.pointer);
1349 return status;
1350 }
1351
1352 static int
1353 acpi_video_get_next_level(struct acpi_video_device *device,
1354 u32 level_current, u32 event)
1355 {
1356 int min, max, min_above, max_below, i, l, delta = 255;
1357 max = max_below = 0;
1358 min = min_above = 255;
1359 /* Find closest level to level_current */
1360 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) {
1361 l = device->brightness->levels[i];
1362 if (abs(l - level_current) < abs(delta)) {
1363 delta = l - level_current;
1364 if (!delta)
1365 break;
1366 }
1367 }
1368 /* Adjust level_current to closest available level */
1369 level_current += delta;
1370 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) {
1371 l = device->brightness->levels[i];
1372 if (l < min)
1373 min = l;
1374 if (l > max)
1375 max = l;
1376 if (l < min_above && l > level_current)
1377 min_above = l;
1378 if (l > max_below && l < level_current)
1379 max_below = l;
1380 }
1381
1382 switch (event) {
1383 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1384 return (level_current < max) ? min_above : min;
1385 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1386 return (level_current < max) ? min_above : max;
1387 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1388 return (level_current > min) ? max_below : min;
1389 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1390 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1391 return 0;
1392 default:
1393 return level_current;
1394 }
1395 }
1396
1397 static void
1398 acpi_video_switch_brightness(struct work_struct *work)
1399 {
1400 struct acpi_video_device *device = container_of(to_delayed_work(work),
1401 struct acpi_video_device, switch_brightness_work);
1402 unsigned long long level_current, level_next;
1403 int event = device->switch_brightness_event;
1404 int result = -EINVAL;
1405
1406 /* no warning message if acpi_backlight=vendor or a quirk is used */
1407 if (!device->backlight)
1408 return;
1409
1410 if (!device->brightness)
1411 goto out;
1412
1413 result = acpi_video_device_lcd_get_level_current(device,
1414 &level_current,
1415 false);
1416 if (result)
1417 goto out;
1418
1419 level_next = acpi_video_get_next_level(device, level_current, event);
1420
1421 result = acpi_video_device_lcd_set_level(device, level_next);
1422
1423 if (!result)
1424 backlight_force_update(device->backlight,
1425 BACKLIGHT_UPDATE_HOTKEY);
1426
1427 out:
1428 if (result)
1429 acpi_handle_info(device->dev->handle,
1430 "Failed to switch brightness\n");
1431 }
1432
1433 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1434 void **edid)
1435 {
1436 struct acpi_video_bus *video;
1437 struct acpi_video_device *video_device;
1438 union acpi_object *buffer = NULL;
1439 acpi_status status;
1440 int i, length;
1441
1442 if (!device || !acpi_driver_data(device))
1443 return -EINVAL;
1444
1445 video = acpi_driver_data(device);
1446
1447 for (i = 0; i < video->attached_count; i++) {
1448 video_device = video->attached_array[i].bind_info;
1449
1450 if (!video_device)
1451 continue;
1452
1453 if (!video_device->cap._DDC)
1454 continue;
1455
1456 if (type) {
1457 switch (type) {
1458 case ACPI_VIDEO_DISPLAY_CRT:
1459 if (!video_device->flags.crt)
1460 continue;
1461 break;
1462 case ACPI_VIDEO_DISPLAY_TV:
1463 if (!video_device->flags.tvout)
1464 continue;
1465 break;
1466 case ACPI_VIDEO_DISPLAY_DVI:
1467 if (!video_device->flags.dvi)
1468 continue;
1469 break;
1470 case ACPI_VIDEO_DISPLAY_LCD:
1471 if (!video_device->flags.lcd)
1472 continue;
1473 break;
1474 }
1475 } else if (video_device->device_id != device_id) {
1476 continue;
1477 }
1478
1479 for (length = 512; length > 0; length -= 128) {
1480 status = acpi_video_device_EDID(video_device, &buffer,
1481 length);
1482 if (ACPI_SUCCESS(status))
1483 break;
1484 }
1485 if (!length)
1486 continue;
1487
1488 *edid = buffer->buffer.pointer;
1489 return length;
1490 }
1491
1492 return -ENODEV;
1493 }
1494 EXPORT_SYMBOL(acpi_video_get_edid);
1495
1496 static int
1497 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1498 struct acpi_device *device)
1499 {
1500 /*
1501 * There are systems where video module known to work fine regardless
1502 * of broken _DOD and ignoring returned value here doesn't cause
1503 * any issues later.
1504 */
1505 acpi_video_device_enumerate(video);
1506
1507 return acpi_dev_for_each_child(device, acpi_video_bus_get_one_device, video);
1508 }
1509
1510 /* acpi_video interface */
1511
1512 /*
1513 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1514 * perform any automatic brightness change on receiving a notification.
1515 */
1516 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1517 {
1518 return acpi_video_bus_DOS(video, 0,
1519 acpi_osi_is_win8() ? 1 : 0);
1520 }
1521
1522 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1523 {
1524 return acpi_video_bus_DOS(video, 0,
1525 acpi_osi_is_win8() ? 0 : 1);
1526 }
1527
1528 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
1529 {
1530 struct acpi_device *device = data;
1531 struct acpi_video_bus *video = acpi_driver_data(device);
1532 struct input_dev *input;
1533 int keycode = 0;
1534
1535 if (!video || !video->input)
1536 return;
1537
1538 input = video->input;
1539
1540 switch (event) {
1541 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1542 * most likely via hotkey. */
1543 keycode = KEY_SWITCHVIDEOMODE;
1544 break;
1545
1546 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1547 * connector. */
1548 acpi_video_device_enumerate(video);
1549 acpi_video_device_rebind(video);
1550 keycode = KEY_SWITCHVIDEOMODE;
1551 break;
1552
1553 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1554 keycode = KEY_SWITCHVIDEOMODE;
1555 break;
1556 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1557 keycode = KEY_VIDEO_NEXT;
1558 break;
1559 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1560 keycode = KEY_VIDEO_PREV;
1561 break;
1562
1563 default:
1564 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n",
1565 event);
1566 break;
1567 }
1568
1569 if (acpi_notifier_call_chain(device, event, 0))
1570 /* Something vetoed the keypress. */
1571 keycode = 0;
1572
1573 if (keycode && (report_key_events & REPORT_OUTPUT_KEY_EVENTS)) {
1574 input_report_key(input, keycode, 1);
1575 input_sync(input);
1576 input_report_key(input, keycode, 0);
1577 input_sync(input);
1578 }
1579 }
1580
1581 static void brightness_switch_event(struct acpi_video_device *video_device,
1582 u32 event)
1583 {
1584 if (!brightness_switch_enabled)
1585 return;
1586
1587 video_device->switch_brightness_event = event;
1588 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10);
1589 }
1590
1591 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1592 {
1593 struct acpi_video_device *video_device = data;
1594 struct acpi_device *device = NULL;
1595 struct acpi_video_bus *bus;
1596 struct input_dev *input;
1597 int keycode = 0;
1598
1599 if (!video_device)
1600 return;
1601
1602 device = video_device->dev;
1603 bus = video_device->video;
1604 input = bus->input;
1605
1606 if (hw_changes_brightness > 0) {
1607 if (video_device->backlight)
1608 backlight_force_update(video_device->backlight,
1609 BACKLIGHT_UPDATE_HOTKEY);
1610 acpi_notifier_call_chain(device, event, 0);
1611 return;
1612 }
1613
1614 switch (event) {
1615 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1616 brightness_switch_event(video_device, event);
1617 keycode = KEY_BRIGHTNESS_CYCLE;
1618 break;
1619 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1620 brightness_switch_event(video_device, event);
1621 keycode = KEY_BRIGHTNESSUP;
1622 break;
1623 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1624 brightness_switch_event(video_device, event);
1625 keycode = KEY_BRIGHTNESSDOWN;
1626 break;
1627 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1628 brightness_switch_event(video_device, event);
1629 keycode = KEY_BRIGHTNESS_ZERO;
1630 break;
1631 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1632 brightness_switch_event(video_device, event);
1633 keycode = KEY_DISPLAY_OFF;
1634 break;
1635 default:
1636 acpi_handle_debug(handle, "Unsupported event [0x%x]\n", event);
1637 break;
1638 }
1639
1640 if (keycode)
1641 may_report_brightness_keys = true;
1642
1643 acpi_notifier_call_chain(device, event, 0);
1644
1645 if (keycode && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS)) {
1646 input_report_key(input, keycode, 1);
1647 input_sync(input);
1648 input_report_key(input, keycode, 0);
1649 input_sync(input);
1650 }
1651 }
1652
1653 static int acpi_video_resume(struct notifier_block *nb,
1654 unsigned long val, void *ign)
1655 {
1656 struct acpi_video_bus *video;
1657 struct acpi_video_device *video_device;
1658 int i;
1659
1660 switch (val) {
1661 case PM_POST_HIBERNATION:
1662 case PM_POST_SUSPEND:
1663 case PM_POST_RESTORE:
1664 video = container_of(nb, struct acpi_video_bus, pm_nb);
1665
1666 dev_info(&video->device->dev, "Restoring backlight state\n");
1667
1668 for (i = 0; i < video->attached_count; i++) {
1669 video_device = video->attached_array[i].bind_info;
1670 if (video_device && video_device->brightness)
1671 acpi_video_device_lcd_set_level(video_device,
1672 video_device->brightness->curr);
1673 }
1674
1675 return NOTIFY_OK;
1676 }
1677 return NOTIFY_DONE;
1678 }
1679
1680 static acpi_status
1681 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1682 void **return_value)
1683 {
1684 struct acpi_device *device = context;
1685 struct acpi_device *sibling;
1686
1687 if (handle == device->handle)
1688 return AE_CTRL_TERMINATE;
1689
1690 sibling = acpi_fetch_acpi_dev(handle);
1691 if (!sibling)
1692 return AE_OK;
1693
1694 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1695 return AE_ALREADY_EXISTS;
1696
1697 return AE_OK;
1698 }
1699
1700 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1701 {
1702 struct backlight_properties props;
1703 struct pci_dev *pdev;
1704 acpi_handle acpi_parent;
1705 struct device *parent = NULL;
1706 int result;
1707 static int count;
1708 char *name;
1709
1710 result = acpi_video_init_brightness(device);
1711 if (result)
1712 return;
1713
1714 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1715 if (!name)
1716 return;
1717 count++;
1718
1719 if (ACPI_SUCCESS(acpi_get_parent(device->dev->handle, &acpi_parent))) {
1720 pdev = acpi_get_pci_dev(acpi_parent);
1721 if (pdev) {
1722 parent = &pdev->dev;
1723 pci_dev_put(pdev);
1724 }
1725 }
1726
1727 memset(&props, 0, sizeof(struct backlight_properties));
1728 props.type = BACKLIGHT_FIRMWARE;
1729 props.max_brightness =
1730 device->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1;
1731 device->backlight = backlight_device_register(name,
1732 parent,
1733 device,
1734 &acpi_backlight_ops,
1735 &props);
1736 kfree(name);
1737 if (IS_ERR(device->backlight)) {
1738 device->backlight = NULL;
1739 return;
1740 }
1741
1742 /*
1743 * Save current brightness level in case we have to restore it
1744 * before acpi_video_device_lcd_set_level() is called next time.
1745 */
1746 device->backlight->props.brightness =
1747 acpi_video_get_brightness(device->backlight);
1748
1749 device->cooling_dev = thermal_cooling_device_register("LCD", device,
1750 &video_cooling_ops);
1751 if (IS_ERR(device->cooling_dev)) {
1752 /*
1753 * Set cooling_dev to NULL so we don't crash trying to free it.
1754 * Also, why the hell we are returning early and not attempt to
1755 * register video output if cooling device registration failed?
1756 * -- dtor
1757 */
1758 device->cooling_dev = NULL;
1759 return;
1760 }
1761
1762 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1763 device->cooling_dev->id);
1764 result = sysfs_create_link(&device->dev->dev.kobj,
1765 &device->cooling_dev->device.kobj,
1766 "thermal_cooling");
1767 if (result)
1768 pr_info("sysfs link creation failed\n");
1769
1770 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1771 &device->dev->dev.kobj, "device");
1772 if (result)
1773 pr_info("Reverse sysfs link creation failed\n");
1774 }
1775
1776 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video)
1777 {
1778 struct acpi_video_device *dev;
1779 union acpi_object *levels;
1780
1781 mutex_lock(&video->device_list_lock);
1782 list_for_each_entry(dev, &video->video_device_list, entry) {
1783 if (!acpi_video_device_lcd_query_levels(dev->dev->handle, &levels))
1784 kfree(levels);
1785 }
1786 mutex_unlock(&video->device_list_lock);
1787 }
1788
1789 static bool acpi_video_should_register_backlight(struct acpi_video_device *dev)
1790 {
1791 /*
1792 * Do not create backlight device for video output
1793 * device that is not in the enumerated list.
1794 */
1795 if (!acpi_video_device_in_dod(dev)) {
1796 dev_dbg(&dev->dev->dev, "not in _DOD list, ignore\n");
1797 return false;
1798 }
1799
1800 if (only_lcd)
1801 return dev->flags.lcd;
1802 return true;
1803 }
1804
1805 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1806 {
1807 struct acpi_video_device *dev;
1808
1809 if (video->backlight_registered)
1810 return 0;
1811
1812 if (acpi_video_get_backlight_type() != acpi_backlight_video)
1813 return 0;
1814
1815 mutex_lock(&video->device_list_lock);
1816 list_for_each_entry(dev, &video->video_device_list, entry) {
1817 if (acpi_video_should_register_backlight(dev))
1818 acpi_video_dev_register_backlight(dev);
1819 }
1820 mutex_unlock(&video->device_list_lock);
1821
1822 video->backlight_registered = true;
1823
1824 video->pm_nb.notifier_call = acpi_video_resume;
1825 video->pm_nb.priority = 0;
1826 return register_pm_notifier(&video->pm_nb);
1827 }
1828
1829 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1830 {
1831 if (device->backlight) {
1832 backlight_device_unregister(device->backlight);
1833 device->backlight = NULL;
1834 }
1835 if (device->brightness) {
1836 kfree(device->brightness->levels);
1837 kfree(device->brightness);
1838 device->brightness = NULL;
1839 }
1840 if (device->cooling_dev) {
1841 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1842 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1843 thermal_cooling_device_unregister(device->cooling_dev);
1844 device->cooling_dev = NULL;
1845 }
1846 }
1847
1848 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1849 {
1850 struct acpi_video_device *dev;
1851 int error;
1852
1853 if (!video->backlight_registered)
1854 return 0;
1855
1856 error = unregister_pm_notifier(&video->pm_nb);
1857
1858 mutex_lock(&video->device_list_lock);
1859 list_for_each_entry(dev, &video->video_device_list, entry)
1860 acpi_video_dev_unregister_backlight(dev);
1861 mutex_unlock(&video->device_list_lock);
1862
1863 video->backlight_registered = false;
1864
1865 return error;
1866 }
1867
1868 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1869 {
1870 acpi_status status;
1871 struct acpi_device *adev = device->dev;
1872
1873 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1874 acpi_video_device_notify, device);
1875 if (ACPI_FAILURE(status))
1876 dev_err(&adev->dev, "Error installing notify handler\n");
1877 else
1878 device->flags.notify = 1;
1879 }
1880
1881 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1882 {
1883 struct input_dev *input;
1884 struct acpi_video_device *dev;
1885 int error;
1886
1887 video->input = input = input_allocate_device();
1888 if (!input) {
1889 error = -ENOMEM;
1890 goto out;
1891 }
1892
1893 error = acpi_video_bus_start_devices(video);
1894 if (error)
1895 goto err_free_input;
1896
1897 snprintf(video->phys, sizeof(video->phys),
1898 "%s/video/input0", acpi_device_hid(video->device));
1899
1900 input->name = acpi_device_name(video->device);
1901 input->phys = video->phys;
1902 input->id.bustype = BUS_HOST;
1903 input->id.product = 0x06;
1904 input->dev.parent = &video->device->dev;
1905 input->evbit[0] = BIT(EV_KEY);
1906 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1907 set_bit(KEY_VIDEO_NEXT, input->keybit);
1908 set_bit(KEY_VIDEO_PREV, input->keybit);
1909 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1910 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1911 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1912 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1913 set_bit(KEY_DISPLAY_OFF, input->keybit);
1914
1915 error = input_register_device(input);
1916 if (error)
1917 goto err_stop_dev;
1918
1919 mutex_lock(&video->device_list_lock);
1920 list_for_each_entry(dev, &video->video_device_list, entry)
1921 acpi_video_dev_add_notify_handler(dev);
1922 mutex_unlock(&video->device_list_lock);
1923
1924 return 0;
1925
1926 err_stop_dev:
1927 acpi_video_bus_stop_devices(video);
1928 err_free_input:
1929 input_free_device(input);
1930 video->input = NULL;
1931 out:
1932 return error;
1933 }
1934
1935 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1936 {
1937 if (dev->flags.notify) {
1938 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1939 acpi_video_device_notify);
1940 dev->flags.notify = 0;
1941 }
1942 }
1943
1944 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1945 {
1946 struct acpi_video_device *dev;
1947
1948 mutex_lock(&video->device_list_lock);
1949 list_for_each_entry(dev, &video->video_device_list, entry)
1950 acpi_video_dev_remove_notify_handler(dev);
1951 mutex_unlock(&video->device_list_lock);
1952
1953 acpi_video_bus_stop_devices(video);
1954 input_unregister_device(video->input);
1955 video->input = NULL;
1956 }
1957
1958 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1959 {
1960 struct acpi_video_device *dev, *next;
1961
1962 mutex_lock(&video->device_list_lock);
1963 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1964 list_del(&dev->entry);
1965 kfree(dev);
1966 }
1967 mutex_unlock(&video->device_list_lock);
1968
1969 return 0;
1970 }
1971
1972 static int instance;
1973
1974 static int acpi_video_bus_add(struct acpi_device *device)
1975 {
1976 struct acpi_video_bus *video;
1977 bool auto_detect;
1978 int error;
1979 acpi_status status;
1980
1981 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1982 acpi_dev_parent(device)->handle, 1,
1983 acpi_video_bus_match, NULL,
1984 device, NULL);
1985 if (status == AE_ALREADY_EXISTS) {
1986 pr_info(FW_BUG
1987 "Duplicate ACPI video bus devices for the"
1988 " same VGA controller, please try module "
1989 "parameter \"video.allow_duplicates=1\""
1990 "if the current driver doesn't work.\n");
1991 if (!allow_duplicates)
1992 return -ENODEV;
1993 }
1994
1995 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1996 if (!video)
1997 return -ENOMEM;
1998
1999 /* a hack to fix the duplicate name "VID" problem on T61 */
2000 if (!strcmp(device->pnp.bus_id, "VID")) {
2001 if (instance)
2002 device->pnp.bus_id[3] = '0' + instance;
2003 instance++;
2004 }
2005 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2006 if (!strcmp(device->pnp.bus_id, "VGA")) {
2007 if (instance)
2008 device->pnp.bus_id[3] = '0' + instance;
2009 instance++;
2010 }
2011
2012 video->device = device;
2013 strscpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2014 strscpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2015 device->driver_data = video;
2016
2017 acpi_video_bus_find_cap(video);
2018 error = acpi_video_bus_check(video);
2019 if (error)
2020 goto err_free_video;
2021
2022 mutex_init(&video->device_list_lock);
2023 INIT_LIST_HEAD(&video->video_device_list);
2024
2025 error = acpi_video_bus_get_devices(video, device);
2026 if (error)
2027 goto err_put_video;
2028
2029 /*
2030 * HP ZBook Fury 16 G10 requires ACPI video's child devices have _PS0
2031 * evaluated to have functional panel brightness control.
2032 */
2033 acpi_device_fix_up_power_children(device);
2034
2035 pr_info("%s [%s] (multi-head: %s rom: %s post: %s)\n",
2036 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2037 video->flags.multihead ? "yes" : "no",
2038 video->flags.rom ? "yes" : "no",
2039 video->flags.post ? "yes" : "no");
2040 mutex_lock(&video_list_lock);
2041 list_add_tail(&video->entry, &video_bus_head);
2042 mutex_unlock(&video_list_lock);
2043
2044 /*
2045 * If backlight-type auto-detection is used then a native backlight may
2046 * show up later and this may change the result from video to native.
2047 * Therefor normally the userspace visible /sys/class/backlight device
2048 * gets registered separately by the GPU driver calling
2049 * acpi_video_register_backlight() when an internal panel is detected.
2050 * Register the backlight now when not using auto-detection, so that
2051 * when the kernel cmdline or DMI-quirks are used the backlight will
2052 * get registered even if acpi_video_register_backlight() is not called.
2053 */
2054 acpi_video_run_bcl_for_osi(video);
2055 if (__acpi_video_get_backlight_type(false, &auto_detect) == acpi_backlight_video &&
2056 !auto_detect)
2057 acpi_video_bus_register_backlight(video);
2058
2059 error = acpi_video_bus_add_notify_handler(video);
2060 if (error)
2061 goto err_del;
2062
2063 error = acpi_dev_install_notify_handler(device, ACPI_DEVICE_NOTIFY,
2064 acpi_video_bus_notify, device);
2065 if (error)
2066 goto err_remove;
2067
2068 return 0;
2069
2070 err_remove:
2071 acpi_video_bus_remove_notify_handler(video);
2072 err_del:
2073 mutex_lock(&video_list_lock);
2074 list_del(&video->entry);
2075 mutex_unlock(&video_list_lock);
2076 acpi_video_bus_unregister_backlight(video);
2077 err_put_video:
2078 acpi_video_bus_put_devices(video);
2079 kfree(video->attached_array);
2080 err_free_video:
2081 kfree(video);
2082 device->driver_data = NULL;
2083
2084 return error;
2085 }
2086
2087 static void acpi_video_bus_remove(struct acpi_device *device)
2088 {
2089 struct acpi_video_bus *video = NULL;
2090
2091
2092 if (!device || !acpi_driver_data(device))
2093 return;
2094
2095 video = acpi_driver_data(device);
2096
2097 acpi_dev_remove_notify_handler(device, ACPI_DEVICE_NOTIFY,
2098 acpi_video_bus_notify);
2099
2100 mutex_lock(&video_list_lock);
2101 list_del(&video->entry);
2102 mutex_unlock(&video_list_lock);
2103
2104 acpi_video_bus_remove_notify_handler(video);
2105 acpi_video_bus_unregister_backlight(video);
2106 acpi_video_bus_put_devices(video);
2107
2108 kfree(video->attached_array);
2109 kfree(video);
2110 }
2111
2112 static int __init is_i740(struct pci_dev *dev)
2113 {
2114 if (dev->device == 0x00D1)
2115 return 1;
2116 if (dev->device == 0x7000)
2117 return 1;
2118 return 0;
2119 }
2120
2121 static int __init intel_opregion_present(void)
2122 {
2123 int opregion = 0;
2124 struct pci_dev *dev = NULL;
2125 u32 address;
2126
2127 for_each_pci_dev(dev) {
2128 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2129 continue;
2130 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2131 continue;
2132 /* We don't want to poke around undefined i740 registers */
2133 if (is_i740(dev))
2134 continue;
2135 pci_read_config_dword(dev, 0xfc, &address);
2136 if (!address)
2137 continue;
2138 opregion = 1;
2139 }
2140 return opregion;
2141 }
2142
2143 int acpi_video_register(void)
2144 {
2145 int ret = 0;
2146
2147 mutex_lock(&register_count_mutex);
2148 if (register_count) {
2149 /*
2150 * if the function of acpi_video_register is already called,
2151 * don't register the acpi_video_bus again and return no error.
2152 */
2153 goto leave;
2154 }
2155
2156 dmi_check_system(video_dmi_table);
2157
2158 ret = acpi_bus_register_driver(&acpi_video_bus);
2159 if (ret)
2160 goto leave;
2161
2162 /*
2163 * When the acpi_video_bus is loaded successfully, increase
2164 * the counter reference.
2165 */
2166 register_count = 1;
2167
2168 leave:
2169 mutex_unlock(&register_count_mutex);
2170 return ret;
2171 }
2172 EXPORT_SYMBOL(acpi_video_register);
2173
2174 void acpi_video_unregister(void)
2175 {
2176 mutex_lock(&register_count_mutex);
2177 if (register_count) {
2178 acpi_bus_unregister_driver(&acpi_video_bus);
2179 register_count = 0;
2180 may_report_brightness_keys = false;
2181 }
2182 mutex_unlock(&register_count_mutex);
2183 }
2184 EXPORT_SYMBOL(acpi_video_unregister);
2185
2186 void acpi_video_register_backlight(void)
2187 {
2188 struct acpi_video_bus *video;
2189
2190 mutex_lock(&video_list_lock);
2191 list_for_each_entry(video, &video_bus_head, entry)
2192 acpi_video_bus_register_backlight(video);
2193 mutex_unlock(&video_list_lock);
2194 }
2195 EXPORT_SYMBOL(acpi_video_register_backlight);
2196
2197 bool acpi_video_handles_brightness_key_presses(void)
2198 {
2199 return may_report_brightness_keys &&
2200 (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS);
2201 }
2202 EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses);
2203
2204 /*
2205 * This is kind of nasty. Hardware using Intel chipsets may require
2206 * the video opregion code to be run first in order to initialise
2207 * state before any ACPI video calls are made. To handle this we defer
2208 * registration of the video class until the opregion code has run.
2209 */
2210
2211 static int __init acpi_video_init(void)
2212 {
2213 /*
2214 * Let the module load even if ACPI is disabled (e.g. due to
2215 * a broken BIOS) so that i915.ko can still be loaded on such
2216 * old systems without an AcpiOpRegion.
2217 *
2218 * acpi_video_register() will report -ENODEV later as well due
2219 * to acpi_disabled when i915.ko tries to register itself afterwards.
2220 */
2221 if (acpi_disabled)
2222 return 0;
2223
2224 if (intel_opregion_present())
2225 return 0;
2226
2227 return acpi_video_register();
2228 }
2229
2230 static void __exit acpi_video_exit(void)
2231 {
2232 acpi_video_unregister();
2233 }
2234
2235 module_init(acpi_video_init);
2236 module_exit(acpi_video_exit);
Kernel DRM miscellaneous fixes and cross-tree changes