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ACPI / video: correct DMI tag for Dell Inspiron 7520
[deliverable/linux.git] / drivers / acpi / video.c
1 /*
2 * video.c - ACPI Video Driver
3 *
4 * Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
5 * Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
6 * Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
7 *
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or (at
13 * your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
23 *
24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25 */
26
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/types.h>
31 #include <linux/list.h>
32 #include <linux/mutex.h>
33 #include <linux/input.h>
34 #include <linux/backlight.h>
35 #include <linux/thermal.h>
36 #include <linux/sort.h>
37 #include <linux/pci.h>
38 #include <linux/pci_ids.h>
39 #include <linux/slab.h>
40 #include <linux/dmi.h>
41 #include <linux/suspend.h>
42 #include <linux/acpi.h>
43 #include <acpi/video.h>
44 #include <asm/uaccess.h>
45
46 #include "internal.h"
47
48 #define ACPI_VIDEO_BUS_NAME "Video Bus"
49 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
50 #define ACPI_VIDEO_NOTIFY_SWITCH 0x80
51 #define ACPI_VIDEO_NOTIFY_PROBE 0x81
52 #define ACPI_VIDEO_NOTIFY_CYCLE 0x82
53 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
54 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
55
56 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
57 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
58 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
59 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
60 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
61
62 #define MAX_NAME_LEN 20
63
64 #define _COMPONENT ACPI_VIDEO_COMPONENT
65 ACPI_MODULE_NAME("video");
66
67 MODULE_AUTHOR("Bruno Ducrot");
68 MODULE_DESCRIPTION("ACPI Video Driver");
69 MODULE_LICENSE("GPL");
70
71 static bool brightness_switch_enabled = 1;
72 module_param(brightness_switch_enabled, bool, 0644);
73
74 /*
75 * By default, we don't allow duplicate ACPI video bus devices
76 * under the same VGA controller
77 */
78 static bool allow_duplicates;
79 module_param(allow_duplicates, bool, 0644);
80
81 /*
82 * For Windows 8 systems: used to decide if video module
83 * should skip registering backlight interface of its own.
84 */
85 static int use_native_backlight_param = -1;
86 module_param_named(use_native_backlight, use_native_backlight_param, int, 0444);
87 static bool use_native_backlight_dmi = false;
88
89 static int register_count;
90 static struct mutex video_list_lock;
91 static struct list_head video_bus_head;
92 static int acpi_video_bus_add(struct acpi_device *device);
93 static int acpi_video_bus_remove(struct acpi_device *device);
94 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
95
96 static const struct acpi_device_id video_device_ids[] = {
97 {ACPI_VIDEO_HID, 0},
98 {"", 0},
99 };
100 MODULE_DEVICE_TABLE(acpi, video_device_ids);
101
102 static struct acpi_driver acpi_video_bus = {
103 .name = "video",
104 .class = ACPI_VIDEO_CLASS,
105 .ids = video_device_ids,
106 .ops = {
107 .add = acpi_video_bus_add,
108 .remove = acpi_video_bus_remove,
109 .notify = acpi_video_bus_notify,
110 },
111 };
112
113 struct acpi_video_bus_flags {
114 u8 multihead:1; /* can switch video heads */
115 u8 rom:1; /* can retrieve a video rom */
116 u8 post:1; /* can configure the head to */
117 u8 reserved:5;
118 };
119
120 struct acpi_video_bus_cap {
121 u8 _DOS:1; /* Enable/Disable output switching */
122 u8 _DOD:1; /* Enumerate all devices attached to display adapter */
123 u8 _ROM:1; /* Get ROM Data */
124 u8 _GPD:1; /* Get POST Device */
125 u8 _SPD:1; /* Set POST Device */
126 u8 _VPO:1; /* Video POST Options */
127 u8 reserved:2;
128 };
129
130 struct acpi_video_device_attrib {
131 u32 display_index:4; /* A zero-based instance of the Display */
132 u32 display_port_attachment:4; /* This field differentiates the display type */
133 u32 display_type:4; /* Describe the specific type in use */
134 u32 vendor_specific:4; /* Chipset Vendor Specific */
135 u32 bios_can_detect:1; /* BIOS can detect the device */
136 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to
137 the VGA device. */
138 u32 pipe_id:3; /* For VGA multiple-head devices. */
139 u32 reserved:10; /* Must be 0 */
140 u32 device_id_scheme:1; /* Device ID Scheme */
141 };
142
143 struct acpi_video_enumerated_device {
144 union {
145 u32 int_val;
146 struct acpi_video_device_attrib attrib;
147 } value;
148 struct acpi_video_device *bind_info;
149 };
150
151 struct acpi_video_bus {
152 struct acpi_device *device;
153 u8 dos_setting;
154 struct acpi_video_enumerated_device *attached_array;
155 u8 attached_count;
156 struct acpi_video_bus_cap cap;
157 struct acpi_video_bus_flags flags;
158 struct list_head video_device_list;
159 struct mutex device_list_lock; /* protects video_device_list */
160 struct list_head entry;
161 struct input_dev *input;
162 char phys[32]; /* for input device */
163 struct notifier_block pm_nb;
164 };
165
166 struct acpi_video_device_flags {
167 u8 crt:1;
168 u8 lcd:1;
169 u8 tvout:1;
170 u8 dvi:1;
171 u8 bios:1;
172 u8 unknown:1;
173 u8 notify:1;
174 u8 reserved:1;
175 };
176
177 struct acpi_video_device_cap {
178 u8 _ADR:1; /* Return the unique ID */
179 u8 _BCL:1; /* Query list of brightness control levels supported */
180 u8 _BCM:1; /* Set the brightness level */
181 u8 _BQC:1; /* Get current brightness level */
182 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
183 u8 _DDC:1; /* Return the EDID for this device */
184 };
185
186 struct acpi_video_brightness_flags {
187 u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
188 u8 _BCL_reversed:1; /* _BCL package is in a reversed order */
189 u8 _BQC_use_index:1; /* _BQC returns an index value */
190 };
191
192 struct acpi_video_device_brightness {
193 int curr;
194 int count;
195 int *levels;
196 struct acpi_video_brightness_flags flags;
197 };
198
199 struct acpi_video_device {
200 unsigned long device_id;
201 struct acpi_video_device_flags flags;
202 struct acpi_video_device_cap cap;
203 struct list_head entry;
204 struct acpi_video_bus *video;
205 struct acpi_device *dev;
206 struct acpi_video_device_brightness *brightness;
207 struct backlight_device *backlight;
208 struct thermal_cooling_device *cooling_dev;
209 };
210
211 static const char device_decode[][30] = {
212 "motherboard VGA device",
213 "PCI VGA device",
214 "AGP VGA device",
215 "UNKNOWN",
216 };
217
218 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
219 static void acpi_video_device_rebind(struct acpi_video_bus *video);
220 static void acpi_video_device_bind(struct acpi_video_bus *video,
221 struct acpi_video_device *device);
222 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
223 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
224 int level);
225 static int acpi_video_device_lcd_get_level_current(
226 struct acpi_video_device *device,
227 unsigned long long *level, bool raw);
228 static int acpi_video_get_next_level(struct acpi_video_device *device,
229 u32 level_current, u32 event);
230 static int acpi_video_switch_brightness(struct acpi_video_device *device,
231 int event);
232
233 static bool acpi_video_use_native_backlight(void)
234 {
235 if (use_native_backlight_param != -1)
236 return use_native_backlight_param;
237 else
238 return use_native_backlight_dmi;
239 }
240
241 static bool acpi_video_verify_backlight_support(void)
242 {
243 if (acpi_osi_is_win8() && acpi_video_use_native_backlight() &&
244 backlight_device_registered(BACKLIGHT_RAW))
245 return false;
246 return acpi_video_backlight_support();
247 }
248
249 /* backlight device sysfs support */
250 static int acpi_video_get_brightness(struct backlight_device *bd)
251 {
252 unsigned long long cur_level;
253 int i;
254 struct acpi_video_device *vd = bl_get_data(bd);
255
256 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
257 return -EINVAL;
258 for (i = 2; i < vd->brightness->count; i++) {
259 if (vd->brightness->levels[i] == cur_level)
260 /*
261 * The first two entries are special - see page 575
262 * of the ACPI spec 3.0
263 */
264 return i - 2;
265 }
266 return 0;
267 }
268
269 static int acpi_video_set_brightness(struct backlight_device *bd)
270 {
271 int request_level = bd->props.brightness + 2;
272 struct acpi_video_device *vd = bl_get_data(bd);
273
274 return acpi_video_device_lcd_set_level(vd,
275 vd->brightness->levels[request_level]);
276 }
277
278 static const struct backlight_ops acpi_backlight_ops = {
279 .get_brightness = acpi_video_get_brightness,
280 .update_status = acpi_video_set_brightness,
281 };
282
283 /* thermal cooling device callbacks */
284 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
285 long *state)
286 {
287 struct acpi_device *device = cooling_dev->devdata;
288 struct acpi_video_device *video = acpi_driver_data(device);
289
290 *state = video->brightness->count - 3;
291 return 0;
292 }
293
294 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
295 long *state)
296 {
297 struct acpi_device *device = cooling_dev->devdata;
298 struct acpi_video_device *video = acpi_driver_data(device);
299 unsigned long long level;
300 int offset;
301
302 if (acpi_video_device_lcd_get_level_current(video, &level, false))
303 return -EINVAL;
304 for (offset = 2; offset < video->brightness->count; offset++)
305 if (level == video->brightness->levels[offset]) {
306 *state = video->brightness->count - offset - 1;
307 return 0;
308 }
309
310 return -EINVAL;
311 }
312
313 static int
314 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
315 {
316 struct acpi_device *device = cooling_dev->devdata;
317 struct acpi_video_device *video = acpi_driver_data(device);
318 int level;
319
320 if (state >= video->brightness->count - 2)
321 return -EINVAL;
322
323 state = video->brightness->count - state;
324 level = video->brightness->levels[state - 1];
325 return acpi_video_device_lcd_set_level(video, level);
326 }
327
328 static const struct thermal_cooling_device_ops video_cooling_ops = {
329 .get_max_state = video_get_max_state,
330 .get_cur_state = video_get_cur_state,
331 .set_cur_state = video_set_cur_state,
332 };
333
334 /*
335 * --------------------------------------------------------------------------
336 * Video Management
337 * --------------------------------------------------------------------------
338 */
339
340 static int
341 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
342 union acpi_object **levels)
343 {
344 int status;
345 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
346 union acpi_object *obj;
347
348
349 *levels = NULL;
350
351 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
352 if (!ACPI_SUCCESS(status))
353 return status;
354 obj = (union acpi_object *)buffer.pointer;
355 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
356 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
357 status = -EFAULT;
358 goto err;
359 }
360
361 *levels = obj;
362
363 return 0;
364
365 err:
366 kfree(buffer.pointer);
367
368 return status;
369 }
370
371 static int
372 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
373 {
374 int status;
375 int state;
376
377 status = acpi_execute_simple_method(device->dev->handle,
378 "_BCM", level);
379 if (ACPI_FAILURE(status)) {
380 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
381 return -EIO;
382 }
383
384 device->brightness->curr = level;
385 for (state = 2; state < device->brightness->count; state++)
386 if (level == device->brightness->levels[state]) {
387 if (device->backlight)
388 device->backlight->props.brightness = state - 2;
389 return 0;
390 }
391
392 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
393 return -EINVAL;
394 }
395
396 /*
397 * For some buggy _BQC methods, we need to add a constant value to
398 * the _BQC return value to get the actual current brightness level
399 */
400
401 static int bqc_offset_aml_bug_workaround;
402 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
403 {
404 bqc_offset_aml_bug_workaround = 9;
405 return 0;
406 }
407
408 static int __init video_set_use_native_backlight(const struct dmi_system_id *d)
409 {
410 use_native_backlight_dmi = true;
411 return 0;
412 }
413
414 static struct dmi_system_id video_dmi_table[] __initdata = {
415 /*
416 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
417 */
418 {
419 .callback = video_set_bqc_offset,
420 .ident = "Acer Aspire 5720",
421 .matches = {
422 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
423 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
424 },
425 },
426 {
427 .callback = video_set_bqc_offset,
428 .ident = "Acer Aspire 5710Z",
429 .matches = {
430 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
431 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
432 },
433 },
434 {
435 .callback = video_set_bqc_offset,
436 .ident = "eMachines E510",
437 .matches = {
438 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
439 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
440 },
441 },
442 {
443 .callback = video_set_bqc_offset,
444 .ident = "Acer Aspire 5315",
445 .matches = {
446 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
447 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
448 },
449 },
450 {
451 .callback = video_set_bqc_offset,
452 .ident = "Acer Aspire 7720",
453 .matches = {
454 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
455 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
456 },
457 },
458 {
459 .callback = video_set_use_native_backlight,
460 .ident = "ThinkPad T430 and T430s",
461 .matches = {
462 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
463 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T430"),
464 },
465 },
466 {
467 .callback = video_set_use_native_backlight,
468 .ident = "ThinkPad X230",
469 .matches = {
470 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
471 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X230"),
472 },
473 },
474 {
475 .callback = video_set_use_native_backlight,
476 .ident = "ThinkPad T530",
477 .matches = {
478 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
479 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T530"),
480 },
481 },
482 {
483 .callback = video_set_use_native_backlight,
484 .ident = "ThinkPad X1 Carbon",
485 .matches = {
486 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
487 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X1 Carbon"),
488 },
489 },
490 {
491 .callback = video_set_use_native_backlight,
492 .ident = "Lenovo Yoga 13",
493 .matches = {
494 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
495 DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo IdeaPad Yoga 13"),
496 },
497 },
498 {
499 .callback = video_set_use_native_backlight,
500 .ident = "Thinkpad Helix",
501 .matches = {
502 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
503 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad Helix"),
504 },
505 },
506 {
507 .callback = video_set_use_native_backlight,
508 .ident = "Dell Inspiron 7520",
509 .matches = {
510 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
511 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7520"),
512 },
513 },
514 {
515 .callback = video_set_use_native_backlight,
516 .ident = "Acer Aspire 5733Z",
517 .matches = {
518 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
519 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5733Z"),
520 },
521 },
522 {
523 .callback = video_set_use_native_backlight,
524 .ident = "Acer Aspire 5742G",
525 .matches = {
526 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
527 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5742G"),
528 },
529 },
530 {
531 .callback = video_set_use_native_backlight,
532 .ident = "Acer Aspire V5-431",
533 .matches = {
534 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
535 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-431"),
536 },
537 },
538 {
539 .callback = video_set_use_native_backlight,
540 .ident = "HP ProBook 4340s",
541 .matches = {
542 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
543 DMI_MATCH(DMI_PRODUCT_VERSION, "HP ProBook 4340s"),
544 },
545 },
546 {
547 .callback = video_set_use_native_backlight,
548 .ident = "HP ProBook 2013 models",
549 .matches = {
550 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
551 DMI_MATCH(DMI_PRODUCT_NAME, "HP ProBook "),
552 DMI_MATCH(DMI_PRODUCT_NAME, " G1"),
553 },
554 },
555 {
556 .callback = video_set_use_native_backlight,
557 .ident = "HP EliteBook 2013 models",
558 .matches = {
559 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
560 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook "),
561 DMI_MATCH(DMI_PRODUCT_NAME, " G1"),
562 },
563 },
564 {
565 .callback = video_set_use_native_backlight,
566 .ident = "HP ZBook 14",
567 .matches = {
568 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
569 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 14"),
570 },
571 },
572 {
573 .callback = video_set_use_native_backlight,
574 .ident = "HP ZBook 15",
575 .matches = {
576 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
577 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 15"),
578 },
579 },
580 {
581 .callback = video_set_use_native_backlight,
582 .ident = "HP ZBook 17",
583 .matches = {
584 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
585 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 17"),
586 },
587 },
588 {
589 .callback = video_set_use_native_backlight,
590 .ident = "HP EliteBook 8780w",
591 .matches = {
592 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
593 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8780w"),
594 },
595 },
596 {}
597 };
598
599 static unsigned long long
600 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
601 unsigned long long bqc_value)
602 {
603 unsigned long long level;
604
605 if (device->brightness->flags._BQC_use_index) {
606 /*
607 * _BQC returns an index that doesn't account for
608 * the first 2 items with special meaning, so we need
609 * to compensate for that by offsetting ourselves
610 */
611 if (device->brightness->flags._BCL_reversed)
612 bqc_value = device->brightness->count - 3 - bqc_value;
613
614 level = device->brightness->levels[bqc_value + 2];
615 } else {
616 level = bqc_value;
617 }
618
619 level += bqc_offset_aml_bug_workaround;
620
621 return level;
622 }
623
624 static int
625 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
626 unsigned long long *level, bool raw)
627 {
628 acpi_status status = AE_OK;
629 int i;
630
631 if (device->cap._BQC || device->cap._BCQ) {
632 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
633
634 status = acpi_evaluate_integer(device->dev->handle, buf,
635 NULL, level);
636 if (ACPI_SUCCESS(status)) {
637 if (raw) {
638 /*
639 * Caller has indicated he wants the raw
640 * value returned by _BQC, so don't furtherly
641 * mess with the value.
642 */
643 return 0;
644 }
645
646 *level = acpi_video_bqc_value_to_level(device, *level);
647
648 for (i = 2; i < device->brightness->count; i++)
649 if (device->brightness->levels[i] == *level) {
650 device->brightness->curr = *level;
651 return 0;
652 }
653 /*
654 * BQC returned an invalid level.
655 * Stop using it.
656 */
657 ACPI_WARNING((AE_INFO,
658 "%s returned an invalid level",
659 buf));
660 device->cap._BQC = device->cap._BCQ = 0;
661 } else {
662 /*
663 * Fixme:
664 * should we return an error or ignore this failure?
665 * dev->brightness->curr is a cached value which stores
666 * the correct current backlight level in most cases.
667 * ACPI video backlight still works w/ buggy _BQC.
668 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
669 */
670 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
671 device->cap._BQC = device->cap._BCQ = 0;
672 }
673 }
674
675 *level = device->brightness->curr;
676 return 0;
677 }
678
679 static int
680 acpi_video_device_EDID(struct acpi_video_device *device,
681 union acpi_object **edid, ssize_t length)
682 {
683 int status;
684 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
685 union acpi_object *obj;
686 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
687 struct acpi_object_list args = { 1, &arg0 };
688
689
690 *edid = NULL;
691
692 if (!device)
693 return -ENODEV;
694 if (length == 128)
695 arg0.integer.value = 1;
696 else if (length == 256)
697 arg0.integer.value = 2;
698 else
699 return -EINVAL;
700
701 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
702 if (ACPI_FAILURE(status))
703 return -ENODEV;
704
705 obj = buffer.pointer;
706
707 if (obj && obj->type == ACPI_TYPE_BUFFER)
708 *edid = obj;
709 else {
710 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
711 status = -EFAULT;
712 kfree(obj);
713 }
714
715 return status;
716 }
717
718 /* bus */
719
720 /*
721 * Arg:
722 * video : video bus device pointer
723 * bios_flag :
724 * 0. The system BIOS should NOT automatically switch(toggle)
725 * the active display output.
726 * 1. The system BIOS should automatically switch (toggle) the
727 * active display output. No switch event.
728 * 2. The _DGS value should be locked.
729 * 3. The system BIOS should not automatically switch (toggle) the
730 * active display output, but instead generate the display switch
731 * event notify code.
732 * lcd_flag :
733 * 0. The system BIOS should automatically control the brightness level
734 * of the LCD when the power changes from AC to DC
735 * 1. The system BIOS should NOT automatically control the brightness
736 * level of the LCD when the power changes from AC to DC.
737 * Return Value:
738 * -EINVAL wrong arg.
739 */
740
741 static int
742 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
743 {
744 acpi_status status;
745
746 if (!video->cap._DOS)
747 return 0;
748
749 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
750 return -EINVAL;
751 video->dos_setting = (lcd_flag << 2) | bios_flag;
752 status = acpi_execute_simple_method(video->device->handle, "_DOS",
753 (lcd_flag << 2) | bios_flag);
754 if (ACPI_FAILURE(status))
755 return -EIO;
756
757 return 0;
758 }
759
760 /*
761 * Simple comparison function used to sort backlight levels.
762 */
763
764 static int
765 acpi_video_cmp_level(const void *a, const void *b)
766 {
767 return *(int *)a - *(int *)b;
768 }
769
770 /*
771 * Decides if _BQC/_BCQ for this system is usable
772 *
773 * We do this by changing the level first and then read out the current
774 * brightness level, if the value does not match, find out if it is using
775 * index. If not, clear the _BQC/_BCQ capability.
776 */
777 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
778 int max_level, int current_level)
779 {
780 struct acpi_video_device_brightness *br = device->brightness;
781 int result;
782 unsigned long long level;
783 int test_level;
784
785 /* don't mess with existing known broken systems */
786 if (bqc_offset_aml_bug_workaround)
787 return 0;
788
789 /*
790 * Some systems always report current brightness level as maximum
791 * through _BQC, we need to test another value for them.
792 */
793 test_level = current_level == max_level ? br->levels[3] : max_level;
794
795 result = acpi_video_device_lcd_set_level(device, test_level);
796 if (result)
797 return result;
798
799 result = acpi_video_device_lcd_get_level_current(device, &level, true);
800 if (result)
801 return result;
802
803 if (level != test_level) {
804 /* buggy _BQC found, need to find out if it uses index */
805 if (level < br->count) {
806 if (br->flags._BCL_reversed)
807 level = br->count - 3 - level;
808 if (br->levels[level + 2] == test_level)
809 br->flags._BQC_use_index = 1;
810 }
811
812 if (!br->flags._BQC_use_index)
813 device->cap._BQC = device->cap._BCQ = 0;
814 }
815
816 return 0;
817 }
818
819
820 /*
821 * Arg:
822 * device : video output device (LCD, CRT, ..)
823 *
824 * Return Value:
825 * Maximum brightness level
826 *
827 * Allocate and initialize device->brightness.
828 */
829
830 static int
831 acpi_video_init_brightness(struct acpi_video_device *device)
832 {
833 union acpi_object *obj = NULL;
834 int i, max_level = 0, count = 0, level_ac_battery = 0;
835 unsigned long long level, level_old;
836 union acpi_object *o;
837 struct acpi_video_device_brightness *br = NULL;
838 int result = -EINVAL;
839 u32 value;
840
841 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
842 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
843 "LCD brightness level\n"));
844 goto out;
845 }
846
847 if (obj->package.count < 2)
848 goto out;
849
850 br = kzalloc(sizeof(*br), GFP_KERNEL);
851 if (!br) {
852 printk(KERN_ERR "can't allocate memory\n");
853 result = -ENOMEM;
854 goto out;
855 }
856
857 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
858 GFP_KERNEL);
859 if (!br->levels) {
860 result = -ENOMEM;
861 goto out_free;
862 }
863
864 for (i = 0; i < obj->package.count; i++) {
865 o = (union acpi_object *)&obj->package.elements[i];
866 if (o->type != ACPI_TYPE_INTEGER) {
867 printk(KERN_ERR PREFIX "Invalid data\n");
868 continue;
869 }
870 value = (u32) o->integer.value;
871 /* Skip duplicate entries */
872 if (count > 2 && br->levels[count - 1] == value)
873 continue;
874
875 br->levels[count] = value;
876
877 if (br->levels[count] > max_level)
878 max_level = br->levels[count];
879 count++;
880 }
881
882 /*
883 * some buggy BIOS don't export the levels
884 * when machine is on AC/Battery in _BCL package.
885 * In this case, the first two elements in _BCL packages
886 * are also supported brightness levels that OS should take care of.
887 */
888 for (i = 2; i < count; i++) {
889 if (br->levels[i] == br->levels[0])
890 level_ac_battery++;
891 if (br->levels[i] == br->levels[1])
892 level_ac_battery++;
893 }
894
895 if (level_ac_battery < 2) {
896 level_ac_battery = 2 - level_ac_battery;
897 br->flags._BCL_no_ac_battery_levels = 1;
898 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
899 br->levels[i] = br->levels[i - level_ac_battery];
900 count += level_ac_battery;
901 } else if (level_ac_battery > 2)
902 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
903
904 /* Check if the _BCL package is in a reversed order */
905 if (max_level == br->levels[2]) {
906 br->flags._BCL_reversed = 1;
907 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
908 acpi_video_cmp_level, NULL);
909 } else if (max_level != br->levels[count - 1])
910 ACPI_ERROR((AE_INFO,
911 "Found unordered _BCL package"));
912
913 br->count = count;
914 device->brightness = br;
915
916 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
917 br->curr = level = max_level;
918
919 if (!device->cap._BQC)
920 goto set_level;
921
922 result = acpi_video_device_lcd_get_level_current(device,
923 &level_old, true);
924 if (result)
925 goto out_free_levels;
926
927 result = acpi_video_bqc_quirk(device, max_level, level_old);
928 if (result)
929 goto out_free_levels;
930 /*
931 * cap._BQC may get cleared due to _BQC is found to be broken
932 * in acpi_video_bqc_quirk, so check again here.
933 */
934 if (!device->cap._BQC)
935 goto set_level;
936
937 level = acpi_video_bqc_value_to_level(device, level_old);
938 /*
939 * On some buggy laptops, _BQC returns an uninitialized
940 * value when invoked for the first time, i.e.
941 * level_old is invalid (no matter whether it's a level
942 * or an index). Set the backlight to max_level in this case.
943 */
944 for (i = 2; i < br->count; i++)
945 if (level == br->levels[i])
946 break;
947 if (i == br->count || !level)
948 level = max_level;
949
950 set_level:
951 result = acpi_video_device_lcd_set_level(device, level);
952 if (result)
953 goto out_free_levels;
954
955 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
956 "found %d brightness levels\n", count - 2));
957 kfree(obj);
958 return result;
959
960 out_free_levels:
961 kfree(br->levels);
962 out_free:
963 kfree(br);
964 out:
965 device->brightness = NULL;
966 kfree(obj);
967 return result;
968 }
969
970 /*
971 * Arg:
972 * device : video output device (LCD, CRT, ..)
973 *
974 * Return Value:
975 * None
976 *
977 * Find out all required AML methods defined under the output
978 * device.
979 */
980
981 static void acpi_video_device_find_cap(struct acpi_video_device *device)
982 {
983 if (acpi_has_method(device->dev->handle, "_ADR"))
984 device->cap._ADR = 1;
985 if (acpi_has_method(device->dev->handle, "_BCL"))
986 device->cap._BCL = 1;
987 if (acpi_has_method(device->dev->handle, "_BCM"))
988 device->cap._BCM = 1;
989 if (acpi_has_method(device->dev->handle, "_BQC")) {
990 device->cap._BQC = 1;
991 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
992 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
993 device->cap._BCQ = 1;
994 }
995
996 if (acpi_has_method(device->dev->handle, "_DDC"))
997 device->cap._DDC = 1;
998 }
999
1000 /*
1001 * Arg:
1002 * device : video output device (VGA)
1003 *
1004 * Return Value:
1005 * None
1006 *
1007 * Find out all required AML methods defined under the video bus device.
1008 */
1009
1010 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1011 {
1012 if (acpi_has_method(video->device->handle, "_DOS"))
1013 video->cap._DOS = 1;
1014 if (acpi_has_method(video->device->handle, "_DOD"))
1015 video->cap._DOD = 1;
1016 if (acpi_has_method(video->device->handle, "_ROM"))
1017 video->cap._ROM = 1;
1018 if (acpi_has_method(video->device->handle, "_GPD"))
1019 video->cap._GPD = 1;
1020 if (acpi_has_method(video->device->handle, "_SPD"))
1021 video->cap._SPD = 1;
1022 if (acpi_has_method(video->device->handle, "_VPO"))
1023 video->cap._VPO = 1;
1024 }
1025
1026 /*
1027 * Check whether the video bus device has required AML method to
1028 * support the desired features
1029 */
1030
1031 static int acpi_video_bus_check(struct acpi_video_bus *video)
1032 {
1033 acpi_status status = -ENOENT;
1034 struct pci_dev *dev;
1035
1036 if (!video)
1037 return -EINVAL;
1038
1039 dev = acpi_get_pci_dev(video->device->handle);
1040 if (!dev)
1041 return -ENODEV;
1042 pci_dev_put(dev);
1043
1044 /*
1045 * Since there is no HID, CID and so on for VGA driver, we have
1046 * to check well known required nodes.
1047 */
1048
1049 /* Does this device support video switching? */
1050 if (video->cap._DOS || video->cap._DOD) {
1051 if (!video->cap._DOS) {
1052 printk(KERN_WARNING FW_BUG
1053 "ACPI(%s) defines _DOD but not _DOS\n",
1054 acpi_device_bid(video->device));
1055 }
1056 video->flags.multihead = 1;
1057 status = 0;
1058 }
1059
1060 /* Does this device support retrieving a video ROM? */
1061 if (video->cap._ROM) {
1062 video->flags.rom = 1;
1063 status = 0;
1064 }
1065
1066 /* Does this device support configuring which video device to POST? */
1067 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1068 video->flags.post = 1;
1069 status = 0;
1070 }
1071
1072 return status;
1073 }
1074
1075 /*
1076 * --------------------------------------------------------------------------
1077 * Driver Interface
1078 * --------------------------------------------------------------------------
1079 */
1080
1081 /* device interface */
1082 static struct acpi_video_device_attrib *
1083 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1084 {
1085 struct acpi_video_enumerated_device *ids;
1086 int i;
1087
1088 for (i = 0; i < video->attached_count; i++) {
1089 ids = &video->attached_array[i];
1090 if ((ids->value.int_val & 0xffff) == device_id)
1091 return &ids->value.attrib;
1092 }
1093
1094 return NULL;
1095 }
1096
1097 static int
1098 acpi_video_get_device_type(struct acpi_video_bus *video,
1099 unsigned long device_id)
1100 {
1101 struct acpi_video_enumerated_device *ids;
1102 int i;
1103
1104 for (i = 0; i < video->attached_count; i++) {
1105 ids = &video->attached_array[i];
1106 if ((ids->value.int_val & 0xffff) == device_id)
1107 return ids->value.int_val;
1108 }
1109
1110 return 0;
1111 }
1112
1113 static int
1114 acpi_video_bus_get_one_device(struct acpi_device *device,
1115 struct acpi_video_bus *video)
1116 {
1117 unsigned long long device_id;
1118 int status, device_type;
1119 struct acpi_video_device *data;
1120 struct acpi_video_device_attrib *attribute;
1121
1122 status =
1123 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1124 /* Some device omits _ADR, we skip them instead of fail */
1125 if (ACPI_FAILURE(status))
1126 return 0;
1127
1128 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1129 if (!data)
1130 return -ENOMEM;
1131
1132 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1133 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1134 device->driver_data = data;
1135
1136 data->device_id = device_id;
1137 data->video = video;
1138 data->dev = device;
1139
1140 attribute = acpi_video_get_device_attr(video, device_id);
1141
1142 if (attribute && attribute->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 mutex_lock(&video->device_list_lock);
1185 list_add_tail(&data->entry, &video->video_device_list);
1186 mutex_unlock(&video->device_list_lock);
1187
1188 return status;
1189 }
1190
1191 /*
1192 * Arg:
1193 * video : video bus device
1194 *
1195 * Return:
1196 * none
1197 *
1198 * Enumerate the video device list of the video bus,
1199 * bind the ids with the corresponding video devices
1200 * under the video bus.
1201 */
1202
1203 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1204 {
1205 struct acpi_video_device *dev;
1206
1207 mutex_lock(&video->device_list_lock);
1208
1209 list_for_each_entry(dev, &video->video_device_list, entry)
1210 acpi_video_device_bind(video, dev);
1211
1212 mutex_unlock(&video->device_list_lock);
1213 }
1214
1215 /*
1216 * Arg:
1217 * video : video bus device
1218 * device : video output device under the video
1219 * bus
1220 *
1221 * Return:
1222 * none
1223 *
1224 * Bind the ids with the corresponding video devices
1225 * under the video bus.
1226 */
1227
1228 static void
1229 acpi_video_device_bind(struct acpi_video_bus *video,
1230 struct acpi_video_device *device)
1231 {
1232 struct acpi_video_enumerated_device *ids;
1233 int i;
1234
1235 for (i = 0; i < video->attached_count; i++) {
1236 ids = &video->attached_array[i];
1237 if (device->device_id == (ids->value.int_val & 0xffff)) {
1238 ids->bind_info = device;
1239 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1240 }
1241 }
1242 }
1243
1244 /*
1245 * Arg:
1246 * video : video bus device
1247 *
1248 * Return:
1249 * < 0 : error
1250 *
1251 * Call _DOD to enumerate all devices attached to display adapter
1252 *
1253 */
1254
1255 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1256 {
1257 int status;
1258 int count;
1259 int i;
1260 struct acpi_video_enumerated_device *active_list;
1261 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1262 union acpi_object *dod = NULL;
1263 union acpi_object *obj;
1264
1265 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1266 if (!ACPI_SUCCESS(status)) {
1267 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1268 return status;
1269 }
1270
1271 dod = buffer.pointer;
1272 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1273 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1274 status = -EFAULT;
1275 goto out;
1276 }
1277
1278 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1279 dod->package.count));
1280
1281 active_list = kcalloc(1 + dod->package.count,
1282 sizeof(struct acpi_video_enumerated_device),
1283 GFP_KERNEL);
1284 if (!active_list) {
1285 status = -ENOMEM;
1286 goto out;
1287 }
1288
1289 count = 0;
1290 for (i = 0; i < dod->package.count; i++) {
1291 obj = &dod->package.elements[i];
1292
1293 if (obj->type != ACPI_TYPE_INTEGER) {
1294 printk(KERN_ERR PREFIX
1295 "Invalid _DOD data in element %d\n", i);
1296 continue;
1297 }
1298
1299 active_list[count].value.int_val = obj->integer.value;
1300 active_list[count].bind_info = NULL;
1301 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1302 (int)obj->integer.value));
1303 count++;
1304 }
1305
1306 kfree(video->attached_array);
1307
1308 video->attached_array = active_list;
1309 video->attached_count = count;
1310
1311 out:
1312 kfree(buffer.pointer);
1313 return status;
1314 }
1315
1316 static int
1317 acpi_video_get_next_level(struct acpi_video_device *device,
1318 u32 level_current, u32 event)
1319 {
1320 int min, max, min_above, max_below, i, l, delta = 255;
1321 max = max_below = 0;
1322 min = min_above = 255;
1323 /* Find closest level to level_current */
1324 for (i = 2; i < device->brightness->count; i++) {
1325 l = device->brightness->levels[i];
1326 if (abs(l - level_current) < abs(delta)) {
1327 delta = l - level_current;
1328 if (!delta)
1329 break;
1330 }
1331 }
1332 /* Ajust level_current to closest available level */
1333 level_current += delta;
1334 for (i = 2; i < device->brightness->count; i++) {
1335 l = device->brightness->levels[i];
1336 if (l < min)
1337 min = l;
1338 if (l > max)
1339 max = l;
1340 if (l < min_above && l > level_current)
1341 min_above = l;
1342 if (l > max_below && l < level_current)
1343 max_below = l;
1344 }
1345
1346 switch (event) {
1347 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1348 return (level_current < max) ? min_above : min;
1349 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1350 return (level_current < max) ? min_above : max;
1351 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1352 return (level_current > min) ? max_below : min;
1353 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1354 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1355 return 0;
1356 default:
1357 return level_current;
1358 }
1359 }
1360
1361 static int
1362 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1363 {
1364 unsigned long long level_current, level_next;
1365 int result = -EINVAL;
1366
1367 /* no warning message if acpi_backlight=vendor or a quirk is used */
1368 if (!acpi_video_verify_backlight_support())
1369 return 0;
1370
1371 if (!device->brightness)
1372 goto out;
1373
1374 result = acpi_video_device_lcd_get_level_current(device,
1375 &level_current,
1376 false);
1377 if (result)
1378 goto out;
1379
1380 level_next = acpi_video_get_next_level(device, level_current, event);
1381
1382 result = acpi_video_device_lcd_set_level(device, level_next);
1383
1384 if (!result)
1385 backlight_force_update(device->backlight,
1386 BACKLIGHT_UPDATE_HOTKEY);
1387
1388 out:
1389 if (result)
1390 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1391
1392 return result;
1393 }
1394
1395 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1396 void **edid)
1397 {
1398 struct acpi_video_bus *video;
1399 struct acpi_video_device *video_device;
1400 union acpi_object *buffer = NULL;
1401 acpi_status status;
1402 int i, length;
1403
1404 if (!device || !acpi_driver_data(device))
1405 return -EINVAL;
1406
1407 video = acpi_driver_data(device);
1408
1409 for (i = 0; i < video->attached_count; i++) {
1410 video_device = video->attached_array[i].bind_info;
1411 length = 256;
1412
1413 if (!video_device)
1414 continue;
1415
1416 if (!video_device->cap._DDC)
1417 continue;
1418
1419 if (type) {
1420 switch (type) {
1421 case ACPI_VIDEO_DISPLAY_CRT:
1422 if (!video_device->flags.crt)
1423 continue;
1424 break;
1425 case ACPI_VIDEO_DISPLAY_TV:
1426 if (!video_device->flags.tvout)
1427 continue;
1428 break;
1429 case ACPI_VIDEO_DISPLAY_DVI:
1430 if (!video_device->flags.dvi)
1431 continue;
1432 break;
1433 case ACPI_VIDEO_DISPLAY_LCD:
1434 if (!video_device->flags.lcd)
1435 continue;
1436 break;
1437 }
1438 } else if (video_device->device_id != device_id) {
1439 continue;
1440 }
1441
1442 status = acpi_video_device_EDID(video_device, &buffer, length);
1443
1444 if (ACPI_FAILURE(status) || !buffer ||
1445 buffer->type != ACPI_TYPE_BUFFER) {
1446 length = 128;
1447 status = acpi_video_device_EDID(video_device, &buffer,
1448 length);
1449 if (ACPI_FAILURE(status) || !buffer ||
1450 buffer->type != ACPI_TYPE_BUFFER) {
1451 continue;
1452 }
1453 }
1454
1455 *edid = buffer->buffer.pointer;
1456 return length;
1457 }
1458
1459 return -ENODEV;
1460 }
1461 EXPORT_SYMBOL(acpi_video_get_edid);
1462
1463 static int
1464 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1465 struct acpi_device *device)
1466 {
1467 int status = 0;
1468 struct acpi_device *dev;
1469
1470 /*
1471 * There are systems where video module known to work fine regardless
1472 * of broken _DOD and ignoring returned value here doesn't cause
1473 * any issues later.
1474 */
1475 acpi_video_device_enumerate(video);
1476
1477 list_for_each_entry(dev, &device->children, node) {
1478
1479 status = acpi_video_bus_get_one_device(dev, video);
1480 if (status) {
1481 dev_err(&dev->dev, "Can't attach device\n");
1482 break;
1483 }
1484 }
1485 return status;
1486 }
1487
1488 /* acpi_video interface */
1489
1490 /*
1491 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1492 * preform any automatic brightness change on receiving a notification.
1493 */
1494 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1495 {
1496 return acpi_video_bus_DOS(video, 0,
1497 acpi_osi_is_win8() ? 1 : 0);
1498 }
1499
1500 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1501 {
1502 return acpi_video_bus_DOS(video, 0,
1503 acpi_osi_is_win8() ? 0 : 1);
1504 }
1505
1506 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1507 {
1508 struct acpi_video_bus *video = acpi_driver_data(device);
1509 struct input_dev *input;
1510 int keycode = 0;
1511
1512 if (!video || !video->input)
1513 return;
1514
1515 input = video->input;
1516
1517 switch (event) {
1518 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1519 * most likely via hotkey. */
1520 keycode = KEY_SWITCHVIDEOMODE;
1521 break;
1522
1523 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1524 * connector. */
1525 acpi_video_device_enumerate(video);
1526 acpi_video_device_rebind(video);
1527 keycode = KEY_SWITCHVIDEOMODE;
1528 break;
1529
1530 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1531 keycode = KEY_SWITCHVIDEOMODE;
1532 break;
1533 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1534 keycode = KEY_VIDEO_NEXT;
1535 break;
1536 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1537 keycode = KEY_VIDEO_PREV;
1538 break;
1539
1540 default:
1541 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1542 "Unsupported event [0x%x]\n", event));
1543 break;
1544 }
1545
1546 if (acpi_notifier_call_chain(device, event, 0))
1547 /* Something vetoed the keypress. */
1548 keycode = 0;
1549
1550 if (keycode) {
1551 input_report_key(input, keycode, 1);
1552 input_sync(input);
1553 input_report_key(input, keycode, 0);
1554 input_sync(input);
1555 }
1556
1557 return;
1558 }
1559
1560 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1561 {
1562 struct acpi_video_device *video_device = data;
1563 struct acpi_device *device = NULL;
1564 struct acpi_video_bus *bus;
1565 struct input_dev *input;
1566 int keycode = 0;
1567
1568 if (!video_device)
1569 return;
1570
1571 device = video_device->dev;
1572 bus = video_device->video;
1573 input = bus->input;
1574
1575 switch (event) {
1576 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1577 if (brightness_switch_enabled)
1578 acpi_video_switch_brightness(video_device, event);
1579 keycode = KEY_BRIGHTNESS_CYCLE;
1580 break;
1581 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1582 if (brightness_switch_enabled)
1583 acpi_video_switch_brightness(video_device, event);
1584 keycode = KEY_BRIGHTNESSUP;
1585 break;
1586 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1587 if (brightness_switch_enabled)
1588 acpi_video_switch_brightness(video_device, event);
1589 keycode = KEY_BRIGHTNESSDOWN;
1590 break;
1591 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1592 if (brightness_switch_enabled)
1593 acpi_video_switch_brightness(video_device, event);
1594 keycode = KEY_BRIGHTNESS_ZERO;
1595 break;
1596 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1597 if (brightness_switch_enabled)
1598 acpi_video_switch_brightness(video_device, event);
1599 keycode = KEY_DISPLAY_OFF;
1600 break;
1601 default:
1602 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1603 "Unsupported event [0x%x]\n", event));
1604 break;
1605 }
1606
1607 acpi_notifier_call_chain(device, event, 0);
1608
1609 if (keycode) {
1610 input_report_key(input, keycode, 1);
1611 input_sync(input);
1612 input_report_key(input, keycode, 0);
1613 input_sync(input);
1614 }
1615
1616 return;
1617 }
1618
1619 static int acpi_video_resume(struct notifier_block *nb,
1620 unsigned long val, void *ign)
1621 {
1622 struct acpi_video_bus *video;
1623 struct acpi_video_device *video_device;
1624 int i;
1625
1626 switch (val) {
1627 case PM_HIBERNATION_PREPARE:
1628 case PM_SUSPEND_PREPARE:
1629 case PM_RESTORE_PREPARE:
1630 return NOTIFY_DONE;
1631 }
1632
1633 video = container_of(nb, struct acpi_video_bus, pm_nb);
1634
1635 dev_info(&video->device->dev, "Restoring backlight state\n");
1636
1637 for (i = 0; i < video->attached_count; i++) {
1638 video_device = video->attached_array[i].bind_info;
1639 if (video_device && video_device->backlight)
1640 acpi_video_set_brightness(video_device->backlight);
1641 }
1642
1643 return NOTIFY_OK;
1644 }
1645
1646 static acpi_status
1647 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1648 void **return_value)
1649 {
1650 struct acpi_device *device = context;
1651 struct acpi_device *sibling;
1652 int result;
1653
1654 if (handle == device->handle)
1655 return AE_CTRL_TERMINATE;
1656
1657 result = acpi_bus_get_device(handle, &sibling);
1658 if (result)
1659 return AE_OK;
1660
1661 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1662 return AE_ALREADY_EXISTS;
1663
1664 return AE_OK;
1665 }
1666
1667 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1668 {
1669 if (acpi_video_verify_backlight_support()) {
1670 struct backlight_properties props;
1671 struct pci_dev *pdev;
1672 acpi_handle acpi_parent;
1673 struct device *parent = NULL;
1674 int result;
1675 static int count;
1676 char *name;
1677
1678 result = acpi_video_init_brightness(device);
1679 if (result)
1680 return;
1681 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1682 if (!name)
1683 return;
1684 count++;
1685
1686 acpi_get_parent(device->dev->handle, &acpi_parent);
1687
1688 pdev = acpi_get_pci_dev(acpi_parent);
1689 if (pdev) {
1690 parent = &pdev->dev;
1691 pci_dev_put(pdev);
1692 }
1693
1694 memset(&props, 0, sizeof(struct backlight_properties));
1695 props.type = BACKLIGHT_FIRMWARE;
1696 props.max_brightness = device->brightness->count - 3;
1697 device->backlight = backlight_device_register(name,
1698 parent,
1699 device,
1700 &acpi_backlight_ops,
1701 &props);
1702 kfree(name);
1703 if (IS_ERR(device->backlight))
1704 return;
1705
1706 /*
1707 * Save current brightness level in case we have to restore it
1708 * before acpi_video_device_lcd_set_level() is called next time.
1709 */
1710 device->backlight->props.brightness =
1711 acpi_video_get_brightness(device->backlight);
1712
1713 device->cooling_dev = thermal_cooling_device_register("LCD",
1714 device->dev, &video_cooling_ops);
1715 if (IS_ERR(device->cooling_dev)) {
1716 /*
1717 * Set cooling_dev to NULL so we don't crash trying to
1718 * free it.
1719 * Also, why the hell we are returning early and
1720 * not attempt to register video output if cooling
1721 * device registration failed?
1722 * -- dtor
1723 */
1724 device->cooling_dev = NULL;
1725 return;
1726 }
1727
1728 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1729 device->cooling_dev->id);
1730 result = sysfs_create_link(&device->dev->dev.kobj,
1731 &device->cooling_dev->device.kobj,
1732 "thermal_cooling");
1733 if (result)
1734 printk(KERN_ERR PREFIX "Create sysfs link\n");
1735 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1736 &device->dev->dev.kobj, "device");
1737 if (result)
1738 printk(KERN_ERR PREFIX "Create sysfs link\n");
1739 }
1740 }
1741
1742 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1743 {
1744 struct acpi_video_device *dev;
1745
1746 mutex_lock(&video->device_list_lock);
1747 list_for_each_entry(dev, &video->video_device_list, entry)
1748 acpi_video_dev_register_backlight(dev);
1749 mutex_unlock(&video->device_list_lock);
1750
1751 video->pm_nb.notifier_call = acpi_video_resume;
1752 video->pm_nb.priority = 0;
1753 return register_pm_notifier(&video->pm_nb);
1754 }
1755
1756 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1757 {
1758 if (device->backlight) {
1759 backlight_device_unregister(device->backlight);
1760 device->backlight = NULL;
1761 }
1762 if (device->brightness) {
1763 kfree(device->brightness->levels);
1764 kfree(device->brightness);
1765 device->brightness = NULL;
1766 }
1767 if (device->cooling_dev) {
1768 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1769 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1770 thermal_cooling_device_unregister(device->cooling_dev);
1771 device->cooling_dev = NULL;
1772 }
1773 }
1774
1775 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1776 {
1777 struct acpi_video_device *dev;
1778 int error = unregister_pm_notifier(&video->pm_nb);
1779
1780 mutex_lock(&video->device_list_lock);
1781 list_for_each_entry(dev, &video->video_device_list, entry)
1782 acpi_video_dev_unregister_backlight(dev);
1783 mutex_unlock(&video->device_list_lock);
1784
1785 return error;
1786 }
1787
1788 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1789 {
1790 acpi_status status;
1791 struct acpi_device *adev = device->dev;
1792
1793 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1794 acpi_video_device_notify, device);
1795 if (ACPI_FAILURE(status))
1796 dev_err(&adev->dev, "Error installing notify handler\n");
1797 else
1798 device->flags.notify = 1;
1799 }
1800
1801 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1802 {
1803 struct input_dev *input;
1804 struct acpi_video_device *dev;
1805 int error;
1806
1807 video->input = input = input_allocate_device();
1808 if (!input) {
1809 error = -ENOMEM;
1810 goto out;
1811 }
1812
1813 error = acpi_video_bus_start_devices(video);
1814 if (error)
1815 goto err_free_input;
1816
1817 snprintf(video->phys, sizeof(video->phys),
1818 "%s/video/input0", acpi_device_hid(video->device));
1819
1820 input->name = acpi_device_name(video->device);
1821 input->phys = video->phys;
1822 input->id.bustype = BUS_HOST;
1823 input->id.product = 0x06;
1824 input->dev.parent = &video->device->dev;
1825 input->evbit[0] = BIT(EV_KEY);
1826 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1827 set_bit(KEY_VIDEO_NEXT, input->keybit);
1828 set_bit(KEY_VIDEO_PREV, input->keybit);
1829 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1830 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1831 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1832 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1833 set_bit(KEY_DISPLAY_OFF, input->keybit);
1834
1835 error = input_register_device(input);
1836 if (error)
1837 goto err_stop_dev;
1838
1839 mutex_lock(&video->device_list_lock);
1840 list_for_each_entry(dev, &video->video_device_list, entry)
1841 acpi_video_dev_add_notify_handler(dev);
1842 mutex_unlock(&video->device_list_lock);
1843
1844 return 0;
1845
1846 err_stop_dev:
1847 acpi_video_bus_stop_devices(video);
1848 err_free_input:
1849 input_free_device(input);
1850 video->input = NULL;
1851 out:
1852 return error;
1853 }
1854
1855 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1856 {
1857 if (dev->flags.notify) {
1858 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1859 acpi_video_device_notify);
1860 dev->flags.notify = 0;
1861 }
1862 }
1863
1864 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1865 {
1866 struct acpi_video_device *dev;
1867
1868 mutex_lock(&video->device_list_lock);
1869 list_for_each_entry(dev, &video->video_device_list, entry)
1870 acpi_video_dev_remove_notify_handler(dev);
1871 mutex_unlock(&video->device_list_lock);
1872
1873 acpi_video_bus_stop_devices(video);
1874 input_unregister_device(video->input);
1875 video->input = NULL;
1876 }
1877
1878 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1879 {
1880 struct acpi_video_device *dev, *next;
1881
1882 mutex_lock(&video->device_list_lock);
1883 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1884 list_del(&dev->entry);
1885 kfree(dev);
1886 }
1887 mutex_unlock(&video->device_list_lock);
1888
1889 return 0;
1890 }
1891
1892 static int instance;
1893
1894 static int acpi_video_bus_add(struct acpi_device *device)
1895 {
1896 struct acpi_video_bus *video;
1897 int error;
1898 acpi_status status;
1899
1900 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1901 device->parent->handle, 1,
1902 acpi_video_bus_match, NULL,
1903 device, NULL);
1904 if (status == AE_ALREADY_EXISTS) {
1905 printk(KERN_WARNING FW_BUG
1906 "Duplicate ACPI video bus devices for the"
1907 " same VGA controller, please try module "
1908 "parameter \"video.allow_duplicates=1\""
1909 "if the current driver doesn't work.\n");
1910 if (!allow_duplicates)
1911 return -ENODEV;
1912 }
1913
1914 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1915 if (!video)
1916 return -ENOMEM;
1917
1918 /* a hack to fix the duplicate name "VID" problem on T61 */
1919 if (!strcmp(device->pnp.bus_id, "VID")) {
1920 if (instance)
1921 device->pnp.bus_id[3] = '0' + instance;
1922 instance++;
1923 }
1924 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1925 if (!strcmp(device->pnp.bus_id, "VGA")) {
1926 if (instance)
1927 device->pnp.bus_id[3] = '0' + instance;
1928 instance++;
1929 }
1930
1931 video->device = device;
1932 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1933 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1934 device->driver_data = video;
1935
1936 acpi_video_bus_find_cap(video);
1937 error = acpi_video_bus_check(video);
1938 if (error)
1939 goto err_free_video;
1940
1941 mutex_init(&video->device_list_lock);
1942 INIT_LIST_HEAD(&video->video_device_list);
1943
1944 error = acpi_video_bus_get_devices(video, device);
1945 if (error)
1946 goto err_put_video;
1947
1948 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
1949 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1950 video->flags.multihead ? "yes" : "no",
1951 video->flags.rom ? "yes" : "no",
1952 video->flags.post ? "yes" : "no");
1953 mutex_lock(&video_list_lock);
1954 list_add_tail(&video->entry, &video_bus_head);
1955 mutex_unlock(&video_list_lock);
1956
1957 acpi_video_bus_register_backlight(video);
1958 acpi_video_bus_add_notify_handler(video);
1959
1960 return 0;
1961
1962 err_put_video:
1963 acpi_video_bus_put_devices(video);
1964 kfree(video->attached_array);
1965 err_free_video:
1966 kfree(video);
1967 device->driver_data = NULL;
1968
1969 return error;
1970 }
1971
1972 static int acpi_video_bus_remove(struct acpi_device *device)
1973 {
1974 struct acpi_video_bus *video = NULL;
1975
1976
1977 if (!device || !acpi_driver_data(device))
1978 return -EINVAL;
1979
1980 video = acpi_driver_data(device);
1981
1982 acpi_video_bus_remove_notify_handler(video);
1983 acpi_video_bus_unregister_backlight(video);
1984 acpi_video_bus_put_devices(video);
1985
1986 mutex_lock(&video_list_lock);
1987 list_del(&video->entry);
1988 mutex_unlock(&video_list_lock);
1989
1990 kfree(video->attached_array);
1991 kfree(video);
1992
1993 return 0;
1994 }
1995
1996 static int __init is_i740(struct pci_dev *dev)
1997 {
1998 if (dev->device == 0x00D1)
1999 return 1;
2000 if (dev->device == 0x7000)
2001 return 1;
2002 return 0;
2003 }
2004
2005 static int __init intel_opregion_present(void)
2006 {
2007 int opregion = 0;
2008 struct pci_dev *dev = NULL;
2009 u32 address;
2010
2011 for_each_pci_dev(dev) {
2012 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2013 continue;
2014 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2015 continue;
2016 /* We don't want to poke around undefined i740 registers */
2017 if (is_i740(dev))
2018 continue;
2019 pci_read_config_dword(dev, 0xfc, &address);
2020 if (!address)
2021 continue;
2022 opregion = 1;
2023 }
2024 return opregion;
2025 }
2026
2027 int acpi_video_register(void)
2028 {
2029 int result = 0;
2030 if (register_count) {
2031 /*
2032 * if the function of acpi_video_register is already called,
2033 * don't register the acpi_vide_bus again and return no error.
2034 */
2035 return 0;
2036 }
2037
2038 mutex_init(&video_list_lock);
2039 INIT_LIST_HEAD(&video_bus_head);
2040
2041 result = acpi_bus_register_driver(&acpi_video_bus);
2042 if (result < 0)
2043 return -ENODEV;
2044
2045 /*
2046 * When the acpi_video_bus is loaded successfully, increase
2047 * the counter reference.
2048 */
2049 register_count = 1;
2050
2051 return 0;
2052 }
2053 EXPORT_SYMBOL(acpi_video_register);
2054
2055 void acpi_video_unregister(void)
2056 {
2057 if (!register_count) {
2058 /*
2059 * If the acpi video bus is already unloaded, don't
2060 * unload it again and return directly.
2061 */
2062 return;
2063 }
2064 acpi_bus_unregister_driver(&acpi_video_bus);
2065
2066 register_count = 0;
2067
2068 return;
2069 }
2070 EXPORT_SYMBOL(acpi_video_unregister);
2071
2072 /*
2073 * This is kind of nasty. Hardware using Intel chipsets may require
2074 * the video opregion code to be run first in order to initialise
2075 * state before any ACPI video calls are made. To handle this we defer
2076 * registration of the video class until the opregion code has run.
2077 */
2078
2079 static int __init acpi_video_init(void)
2080 {
2081 dmi_check_system(video_dmi_table);
2082
2083 if (intel_opregion_present())
2084 return 0;
2085
2086 return acpi_video_register();
2087 }
2088
2089 static void __exit acpi_video_exit(void)
2090 {
2091 acpi_video_unregister();
2092
2093 return;
2094 }
2095
2096 module_init(acpi_video_init);
2097 module_exit(acpi_video_exit);
Linux kernel - Deliverables
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