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Merge remote-tracking branches 'asoc/fix/alc5632', 'asoc/fix/cs42l52', 'asoc/fix...
[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 PREFIX "ACPI: "
49
50 #define ACPI_VIDEO_BUS_NAME "Video Bus"
51 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
52 #define ACPI_VIDEO_NOTIFY_SWITCH 0x80
53 #define ACPI_VIDEO_NOTIFY_PROBE 0x81
54 #define ACPI_VIDEO_NOTIFY_CYCLE 0x82
55 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
56 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
57
58 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
59 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
60 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
61 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
62 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
63
64 #define MAX_NAME_LEN 20
65
66 #define _COMPONENT ACPI_VIDEO_COMPONENT
67 ACPI_MODULE_NAME("video");
68
69 MODULE_AUTHOR("Bruno Ducrot");
70 MODULE_DESCRIPTION("ACPI Video Driver");
71 MODULE_LICENSE("GPL");
72
73 static bool brightness_switch_enabled = 1;
74 module_param(brightness_switch_enabled, bool, 0644);
75
76 /*
77 * By default, we don't allow duplicate ACPI video bus devices
78 * under the same VGA controller
79 */
80 static bool allow_duplicates;
81 module_param(allow_duplicates, bool, 0644);
82
83 /*
84 * For Windows 8 systems: used to decide if video module
85 * should skip registering backlight interface of its own.
86 */
87 static int use_native_backlight_param = -1;
88 module_param_named(use_native_backlight, use_native_backlight_param, int, 0444);
89 static bool use_native_backlight_dmi = false;
90
91 static int register_count;
92 static struct mutex video_list_lock;
93 static struct list_head video_bus_head;
94 static int acpi_video_bus_add(struct acpi_device *device);
95 static int acpi_video_bus_remove(struct acpi_device *device);
96 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
97
98 static const struct acpi_device_id video_device_ids[] = {
99 {ACPI_VIDEO_HID, 0},
100 {"", 0},
101 };
102 MODULE_DEVICE_TABLE(acpi, video_device_ids);
103
104 static struct acpi_driver acpi_video_bus = {
105 .name = "video",
106 .class = ACPI_VIDEO_CLASS,
107 .ids = video_device_ids,
108 .ops = {
109 .add = acpi_video_bus_add,
110 .remove = acpi_video_bus_remove,
111 .notify = acpi_video_bus_notify,
112 },
113 };
114
115 struct acpi_video_bus_flags {
116 u8 multihead:1; /* can switch video heads */
117 u8 rom:1; /* can retrieve a video rom */
118 u8 post:1; /* can configure the head to */
119 u8 reserved:5;
120 };
121
122 struct acpi_video_bus_cap {
123 u8 _DOS:1; /* Enable/Disable output switching */
124 u8 _DOD:1; /* Enumerate all devices attached to display adapter */
125 u8 _ROM:1; /* Get ROM Data */
126 u8 _GPD:1; /* Get POST Device */
127 u8 _SPD:1; /* Set POST Device */
128 u8 _VPO:1; /* Video POST Options */
129 u8 reserved:2;
130 };
131
132 struct acpi_video_device_attrib {
133 u32 display_index:4; /* A zero-based instance of the Display */
134 u32 display_port_attachment:4; /* This field differentiates the display type */
135 u32 display_type:4; /* Describe the specific type in use */
136 u32 vendor_specific:4; /* Chipset Vendor Specific */
137 u32 bios_can_detect:1; /* BIOS can detect the device */
138 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to
139 the VGA device. */
140 u32 pipe_id:3; /* For VGA multiple-head devices. */
141 u32 reserved:10; /* Must be 0 */
142 u32 device_id_scheme:1; /* Device ID Scheme */
143 };
144
145 struct acpi_video_enumerated_device {
146 union {
147 u32 int_val;
148 struct acpi_video_device_attrib attrib;
149 } value;
150 struct acpi_video_device *bind_info;
151 };
152
153 struct acpi_video_bus {
154 struct acpi_device *device;
155 u8 dos_setting;
156 struct acpi_video_enumerated_device *attached_array;
157 u8 attached_count;
158 struct acpi_video_bus_cap cap;
159 struct acpi_video_bus_flags flags;
160 struct list_head video_device_list;
161 struct mutex device_list_lock; /* protects video_device_list */
162 struct list_head entry;
163 struct input_dev *input;
164 char phys[32]; /* for input device */
165 struct notifier_block pm_nb;
166 };
167
168 struct acpi_video_device_flags {
169 u8 crt:1;
170 u8 lcd:1;
171 u8 tvout:1;
172 u8 dvi:1;
173 u8 bios:1;
174 u8 unknown:1;
175 u8 notify:1;
176 u8 reserved:1;
177 };
178
179 struct acpi_video_device_cap {
180 u8 _ADR:1; /* Return the unique ID */
181 u8 _BCL:1; /* Query list of brightness control levels supported */
182 u8 _BCM:1; /* Set the brightness level */
183 u8 _BQC:1; /* Get current brightness level */
184 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
185 u8 _DDC:1; /* Return the EDID for this device */
186 };
187
188 struct acpi_video_brightness_flags {
189 u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
190 u8 _BCL_reversed:1; /* _BCL package is in a reversed order */
191 u8 _BQC_use_index:1; /* _BQC returns an index value */
192 };
193
194 struct acpi_video_device_brightness {
195 int curr;
196 int count;
197 int *levels;
198 struct acpi_video_brightness_flags flags;
199 };
200
201 struct acpi_video_device {
202 unsigned long device_id;
203 struct acpi_video_device_flags flags;
204 struct acpi_video_device_cap cap;
205 struct list_head entry;
206 struct acpi_video_bus *video;
207 struct acpi_device *dev;
208 struct acpi_video_device_brightness *brightness;
209 struct backlight_device *backlight;
210 struct thermal_cooling_device *cooling_dev;
211 };
212
213 static const char device_decode[][30] = {
214 "motherboard VGA device",
215 "PCI VGA device",
216 "AGP VGA device",
217 "UNKNOWN",
218 };
219
220 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
221 static void acpi_video_device_rebind(struct acpi_video_bus *video);
222 static void acpi_video_device_bind(struct acpi_video_bus *video,
223 struct acpi_video_device *device);
224 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
225 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
226 int level);
227 static int acpi_video_device_lcd_get_level_current(
228 struct acpi_video_device *device,
229 unsigned long long *level, bool raw);
230 static int acpi_video_get_next_level(struct acpi_video_device *device,
231 u32 level_current, u32 event);
232 static int acpi_video_switch_brightness(struct acpi_video_device *device,
233 int event);
234
235 static bool acpi_video_use_native_backlight(void)
236 {
237 if (use_native_backlight_param != -1)
238 return use_native_backlight_param;
239 else
240 return use_native_backlight_dmi;
241 }
242
243 static bool acpi_video_verify_backlight_support(void)
244 {
245 if (acpi_osi_is_win8() && acpi_video_use_native_backlight() &&
246 backlight_device_registered(BACKLIGHT_RAW))
247 return false;
248 return acpi_video_backlight_support();
249 }
250
251 /* backlight device sysfs support */
252 static int acpi_video_get_brightness(struct backlight_device *bd)
253 {
254 unsigned long long cur_level;
255 int i;
256 struct acpi_video_device *vd = bl_get_data(bd);
257
258 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
259 return -EINVAL;
260 for (i = 2; i < vd->brightness->count; i++) {
261 if (vd->brightness->levels[i] == cur_level)
262 /*
263 * The first two entries are special - see page 575
264 * of the ACPI spec 3.0
265 */
266 return i - 2;
267 }
268 return 0;
269 }
270
271 static int acpi_video_set_brightness(struct backlight_device *bd)
272 {
273 int request_level = bd->props.brightness + 2;
274 struct acpi_video_device *vd = bl_get_data(bd);
275
276 return acpi_video_device_lcd_set_level(vd,
277 vd->brightness->levels[request_level]);
278 }
279
280 static const struct backlight_ops acpi_backlight_ops = {
281 .get_brightness = acpi_video_get_brightness,
282 .update_status = acpi_video_set_brightness,
283 };
284
285 /* thermal cooling device callbacks */
286 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
287 long *state)
288 {
289 struct acpi_device *device = cooling_dev->devdata;
290 struct acpi_video_device *video = acpi_driver_data(device);
291
292 *state = video->brightness->count - 3;
293 return 0;
294 }
295
296 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
297 long *state)
298 {
299 struct acpi_device *device = cooling_dev->devdata;
300 struct acpi_video_device *video = acpi_driver_data(device);
301 unsigned long long level;
302 int offset;
303
304 if (acpi_video_device_lcd_get_level_current(video, &level, false))
305 return -EINVAL;
306 for (offset = 2; offset < video->brightness->count; offset++)
307 if (level == video->brightness->levels[offset]) {
308 *state = video->brightness->count - offset - 1;
309 return 0;
310 }
311
312 return -EINVAL;
313 }
314
315 static int
316 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
317 {
318 struct acpi_device *device = cooling_dev->devdata;
319 struct acpi_video_device *video = acpi_driver_data(device);
320 int level;
321
322 if (state >= video->brightness->count - 2)
323 return -EINVAL;
324
325 state = video->brightness->count - state;
326 level = video->brightness->levels[state - 1];
327 return acpi_video_device_lcd_set_level(video, level);
328 }
329
330 static const struct thermal_cooling_device_ops video_cooling_ops = {
331 .get_max_state = video_get_max_state,
332 .get_cur_state = video_get_cur_state,
333 .set_cur_state = video_set_cur_state,
334 };
335
336 /*
337 * --------------------------------------------------------------------------
338 * Video Management
339 * --------------------------------------------------------------------------
340 */
341
342 static int
343 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
344 union acpi_object **levels)
345 {
346 int status;
347 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
348 union acpi_object *obj;
349
350
351 *levels = NULL;
352
353 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
354 if (!ACPI_SUCCESS(status))
355 return status;
356 obj = (union acpi_object *)buffer.pointer;
357 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
358 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
359 status = -EFAULT;
360 goto err;
361 }
362
363 *levels = obj;
364
365 return 0;
366
367 err:
368 kfree(buffer.pointer);
369
370 return status;
371 }
372
373 static int
374 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
375 {
376 int status;
377 int state;
378
379 status = acpi_execute_simple_method(device->dev->handle,
380 "_BCM", level);
381 if (ACPI_FAILURE(status)) {
382 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
383 return -EIO;
384 }
385
386 device->brightness->curr = level;
387 for (state = 2; state < device->brightness->count; state++)
388 if (level == device->brightness->levels[state]) {
389 if (device->backlight)
390 device->backlight->props.brightness = state - 2;
391 return 0;
392 }
393
394 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
395 return -EINVAL;
396 }
397
398 /*
399 * For some buggy _BQC methods, we need to add a constant value to
400 * the _BQC return value to get the actual current brightness level
401 */
402
403 static int bqc_offset_aml_bug_workaround;
404 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
405 {
406 bqc_offset_aml_bug_workaround = 9;
407 return 0;
408 }
409
410 static int __init video_set_use_native_backlight(const struct dmi_system_id *d)
411 {
412 use_native_backlight_dmi = true;
413 return 0;
414 }
415
416 static struct dmi_system_id video_dmi_table[] __initdata = {
417 /*
418 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
419 */
420 {
421 .callback = video_set_bqc_offset,
422 .ident = "Acer Aspire 5720",
423 .matches = {
424 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
425 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
426 },
427 },
428 {
429 .callback = video_set_bqc_offset,
430 .ident = "Acer Aspire 5710Z",
431 .matches = {
432 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
433 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
434 },
435 },
436 {
437 .callback = video_set_bqc_offset,
438 .ident = "eMachines E510",
439 .matches = {
440 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
441 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
442 },
443 },
444 {
445 .callback = video_set_bqc_offset,
446 .ident = "Acer Aspire 5315",
447 .matches = {
448 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
449 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
450 },
451 },
452 {
453 .callback = video_set_bqc_offset,
454 .ident = "Acer Aspire 7720",
455 .matches = {
456 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
457 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
458 },
459 },
460 {
461 .callback = video_set_use_native_backlight,
462 .ident = "ThinkPad T430s",
463 .matches = {
464 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
465 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T430s"),
466 },
467 },
468 {
469 .callback = video_set_use_native_backlight,
470 .ident = "ThinkPad X230",
471 .matches = {
472 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
473 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X230"),
474 },
475 },
476 {
477 .callback = video_set_use_native_backlight,
478 .ident = "ThinkPad X1 Carbon",
479 .matches = {
480 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
481 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X1 Carbon"),
482 },
483 },
484 {
485 .callback = video_set_use_native_backlight,
486 .ident = "Lenovo Yoga 13",
487 .matches = {
488 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
489 DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo IdeaPad Yoga 13"),
490 },
491 },
492 {
493 .callback = video_set_use_native_backlight,
494 .ident = "Dell Inspiron 7520",
495 .matches = {
496 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
497 DMI_MATCH(DMI_PRODUCT_VERSION, "Inspiron 7520"),
498 },
499 },
500 {
501 .callback = video_set_use_native_backlight,
502 .ident = "Acer Aspire 5733Z",
503 .matches = {
504 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
505 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5733Z"),
506 },
507 },
508 {
509 .callback = video_set_use_native_backlight,
510 .ident = "Acer Aspire V5-431",
511 .matches = {
512 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
513 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-431"),
514 },
515 },
516 {
517 .callback = video_set_use_native_backlight,
518 .ident = "HP ProBook 4340s",
519 .matches = {
520 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
521 DMI_MATCH(DMI_PRODUCT_VERSION, "HP ProBook 4340s"),
522 },
523 },
524 {
525 .callback = video_set_use_native_backlight,
526 .ident = "HP ProBook 2013 models",
527 .matches = {
528 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
529 DMI_MATCH(DMI_PRODUCT_NAME, "HP ProBook "),
530 DMI_MATCH(DMI_PRODUCT_NAME, " G1"),
531 },
532 },
533 {
534 .callback = video_set_use_native_backlight,
535 .ident = "HP EliteBook 2013 models",
536 .matches = {
537 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
538 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook "),
539 DMI_MATCH(DMI_PRODUCT_NAME, " G1"),
540 },
541 },
542 {
543 .callback = video_set_use_native_backlight,
544 .ident = "HP ZBook 14",
545 .matches = {
546 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
547 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 14"),
548 },
549 },
550 {
551 .callback = video_set_use_native_backlight,
552 .ident = "HP ZBook 15",
553 .matches = {
554 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
555 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 15"),
556 },
557 },
558 {
559 .callback = video_set_use_native_backlight,
560 .ident = "HP ZBook 17",
561 .matches = {
562 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
563 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 17"),
564 },
565 },
566 {
567 .callback = video_set_use_native_backlight,
568 .ident = "HP EliteBook 8780w",
569 .matches = {
570 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
571 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8780w"),
572 },
573 },
574 {}
575 };
576
577 static unsigned long long
578 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
579 unsigned long long bqc_value)
580 {
581 unsigned long long level;
582
583 if (device->brightness->flags._BQC_use_index) {
584 /*
585 * _BQC returns an index that doesn't account for
586 * the first 2 items with special meaning, so we need
587 * to compensate for that by offsetting ourselves
588 */
589 if (device->brightness->flags._BCL_reversed)
590 bqc_value = device->brightness->count - 3 - bqc_value;
591
592 level = device->brightness->levels[bqc_value + 2];
593 } else {
594 level = bqc_value;
595 }
596
597 level += bqc_offset_aml_bug_workaround;
598
599 return level;
600 }
601
602 static int
603 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
604 unsigned long long *level, bool raw)
605 {
606 acpi_status status = AE_OK;
607 int i;
608
609 if (device->cap._BQC || device->cap._BCQ) {
610 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
611
612 status = acpi_evaluate_integer(device->dev->handle, buf,
613 NULL, level);
614 if (ACPI_SUCCESS(status)) {
615 if (raw) {
616 /*
617 * Caller has indicated he wants the raw
618 * value returned by _BQC, so don't furtherly
619 * mess with the value.
620 */
621 return 0;
622 }
623
624 *level = acpi_video_bqc_value_to_level(device, *level);
625
626 for (i = 2; i < device->brightness->count; i++)
627 if (device->brightness->levels[i] == *level) {
628 device->brightness->curr = *level;
629 return 0;
630 }
631 /*
632 * BQC returned an invalid level.
633 * Stop using it.
634 */
635 ACPI_WARNING((AE_INFO,
636 "%s returned an invalid level",
637 buf));
638 device->cap._BQC = device->cap._BCQ = 0;
639 } else {
640 /*
641 * Fixme:
642 * should we return an error or ignore this failure?
643 * dev->brightness->curr is a cached value which stores
644 * the correct current backlight level in most cases.
645 * ACPI video backlight still works w/ buggy _BQC.
646 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
647 */
648 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
649 device->cap._BQC = device->cap._BCQ = 0;
650 }
651 }
652
653 *level = device->brightness->curr;
654 return 0;
655 }
656
657 static int
658 acpi_video_device_EDID(struct acpi_video_device *device,
659 union acpi_object **edid, ssize_t length)
660 {
661 int status;
662 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
663 union acpi_object *obj;
664 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
665 struct acpi_object_list args = { 1, &arg0 };
666
667
668 *edid = NULL;
669
670 if (!device)
671 return -ENODEV;
672 if (length == 128)
673 arg0.integer.value = 1;
674 else if (length == 256)
675 arg0.integer.value = 2;
676 else
677 return -EINVAL;
678
679 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
680 if (ACPI_FAILURE(status))
681 return -ENODEV;
682
683 obj = buffer.pointer;
684
685 if (obj && obj->type == ACPI_TYPE_BUFFER)
686 *edid = obj;
687 else {
688 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
689 status = -EFAULT;
690 kfree(obj);
691 }
692
693 return status;
694 }
695
696 /* bus */
697
698 /*
699 * Arg:
700 * video : video bus device pointer
701 * bios_flag :
702 * 0. The system BIOS should NOT automatically switch(toggle)
703 * the active display output.
704 * 1. The system BIOS should automatically switch (toggle) the
705 * active display output. No switch event.
706 * 2. The _DGS value should be locked.
707 * 3. The system BIOS should not automatically switch (toggle) the
708 * active display output, but instead generate the display switch
709 * event notify code.
710 * lcd_flag :
711 * 0. The system BIOS should automatically control the brightness level
712 * of the LCD when the power changes from AC to DC
713 * 1. The system BIOS should NOT automatically control the brightness
714 * level of the LCD when the power changes from AC to DC.
715 * Return Value:
716 * -EINVAL wrong arg.
717 */
718
719 static int
720 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
721 {
722 acpi_status status;
723
724 if (!video->cap._DOS)
725 return 0;
726
727 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
728 return -EINVAL;
729 video->dos_setting = (lcd_flag << 2) | bios_flag;
730 status = acpi_execute_simple_method(video->device->handle, "_DOS",
731 (lcd_flag << 2) | bios_flag);
732 if (ACPI_FAILURE(status))
733 return -EIO;
734
735 return 0;
736 }
737
738 /*
739 * Simple comparison function used to sort backlight levels.
740 */
741
742 static int
743 acpi_video_cmp_level(const void *a, const void *b)
744 {
745 return *(int *)a - *(int *)b;
746 }
747
748 /*
749 * Decides if _BQC/_BCQ for this system is usable
750 *
751 * We do this by changing the level first and then read out the current
752 * brightness level, if the value does not match, find out if it is using
753 * index. If not, clear the _BQC/_BCQ capability.
754 */
755 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
756 int max_level, int current_level)
757 {
758 struct acpi_video_device_brightness *br = device->brightness;
759 int result;
760 unsigned long long level;
761 int test_level;
762
763 /* don't mess with existing known broken systems */
764 if (bqc_offset_aml_bug_workaround)
765 return 0;
766
767 /*
768 * Some systems always report current brightness level as maximum
769 * through _BQC, we need to test another value for them.
770 */
771 test_level = current_level == max_level ? br->levels[3] : max_level;
772
773 result = acpi_video_device_lcd_set_level(device, test_level);
774 if (result)
775 return result;
776
777 result = acpi_video_device_lcd_get_level_current(device, &level, true);
778 if (result)
779 return result;
780
781 if (level != test_level) {
782 /* buggy _BQC found, need to find out if it uses index */
783 if (level < br->count) {
784 if (br->flags._BCL_reversed)
785 level = br->count - 3 - level;
786 if (br->levels[level + 2] == test_level)
787 br->flags._BQC_use_index = 1;
788 }
789
790 if (!br->flags._BQC_use_index)
791 device->cap._BQC = device->cap._BCQ = 0;
792 }
793
794 return 0;
795 }
796
797
798 /*
799 * Arg:
800 * device : video output device (LCD, CRT, ..)
801 *
802 * Return Value:
803 * Maximum brightness level
804 *
805 * Allocate and initialize device->brightness.
806 */
807
808 static int
809 acpi_video_init_brightness(struct acpi_video_device *device)
810 {
811 union acpi_object *obj = NULL;
812 int i, max_level = 0, count = 0, level_ac_battery = 0;
813 unsigned long long level, level_old;
814 union acpi_object *o;
815 struct acpi_video_device_brightness *br = NULL;
816 int result = -EINVAL;
817 u32 value;
818
819 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
820 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
821 "LCD brightness level\n"));
822 goto out;
823 }
824
825 if (obj->package.count < 2)
826 goto out;
827
828 br = kzalloc(sizeof(*br), GFP_KERNEL);
829 if (!br) {
830 printk(KERN_ERR "can't allocate memory\n");
831 result = -ENOMEM;
832 goto out;
833 }
834
835 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
836 GFP_KERNEL);
837 if (!br->levels) {
838 result = -ENOMEM;
839 goto out_free;
840 }
841
842 for (i = 0; i < obj->package.count; i++) {
843 o = (union acpi_object *)&obj->package.elements[i];
844 if (o->type != ACPI_TYPE_INTEGER) {
845 printk(KERN_ERR PREFIX "Invalid data\n");
846 continue;
847 }
848 value = (u32) o->integer.value;
849 /* Skip duplicate entries */
850 if (count > 2 && br->levels[count - 1] == value)
851 continue;
852
853 br->levels[count] = value;
854
855 if (br->levels[count] > max_level)
856 max_level = br->levels[count];
857 count++;
858 }
859
860 /*
861 * some buggy BIOS don't export the levels
862 * when machine is on AC/Battery in _BCL package.
863 * In this case, the first two elements in _BCL packages
864 * are also supported brightness levels that OS should take care of.
865 */
866 for (i = 2; i < count; i++) {
867 if (br->levels[i] == br->levels[0])
868 level_ac_battery++;
869 if (br->levels[i] == br->levels[1])
870 level_ac_battery++;
871 }
872
873 if (level_ac_battery < 2) {
874 level_ac_battery = 2 - level_ac_battery;
875 br->flags._BCL_no_ac_battery_levels = 1;
876 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
877 br->levels[i] = br->levels[i - level_ac_battery];
878 count += level_ac_battery;
879 } else if (level_ac_battery > 2)
880 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
881
882 /* Check if the _BCL package is in a reversed order */
883 if (max_level == br->levels[2]) {
884 br->flags._BCL_reversed = 1;
885 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
886 acpi_video_cmp_level, NULL);
887 } else if (max_level != br->levels[count - 1])
888 ACPI_ERROR((AE_INFO,
889 "Found unordered _BCL package"));
890
891 br->count = count;
892 device->brightness = br;
893
894 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
895 br->curr = level = max_level;
896
897 if (!device->cap._BQC)
898 goto set_level;
899
900 result = acpi_video_device_lcd_get_level_current(device,
901 &level_old, true);
902 if (result)
903 goto out_free_levels;
904
905 result = acpi_video_bqc_quirk(device, max_level, level_old);
906 if (result)
907 goto out_free_levels;
908 /*
909 * cap._BQC may get cleared due to _BQC is found to be broken
910 * in acpi_video_bqc_quirk, so check again here.
911 */
912 if (!device->cap._BQC)
913 goto set_level;
914
915 level = acpi_video_bqc_value_to_level(device, level_old);
916 /*
917 * On some buggy laptops, _BQC returns an uninitialized
918 * value when invoked for the first time, i.e.
919 * level_old is invalid (no matter whether it's a level
920 * or an index). Set the backlight to max_level in this case.
921 */
922 for (i = 2; i < br->count; i++)
923 if (level == br->levels[i])
924 break;
925 if (i == br->count || !level)
926 level = max_level;
927
928 set_level:
929 result = acpi_video_device_lcd_set_level(device, level);
930 if (result)
931 goto out_free_levels;
932
933 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
934 "found %d brightness levels\n", count - 2));
935 kfree(obj);
936 return result;
937
938 out_free_levels:
939 kfree(br->levels);
940 out_free:
941 kfree(br);
942 out:
943 device->brightness = NULL;
944 kfree(obj);
945 return result;
946 }
947
948 /*
949 * Arg:
950 * device : video output device (LCD, CRT, ..)
951 *
952 * Return Value:
953 * None
954 *
955 * Find out all required AML methods defined under the output
956 * device.
957 */
958
959 static void acpi_video_device_find_cap(struct acpi_video_device *device)
960 {
961 if (acpi_has_method(device->dev->handle, "_ADR"))
962 device->cap._ADR = 1;
963 if (acpi_has_method(device->dev->handle, "_BCL"))
964 device->cap._BCL = 1;
965 if (acpi_has_method(device->dev->handle, "_BCM"))
966 device->cap._BCM = 1;
967 if (acpi_has_method(device->dev->handle, "_BQC")) {
968 device->cap._BQC = 1;
969 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
970 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
971 device->cap._BCQ = 1;
972 }
973
974 if (acpi_has_method(device->dev->handle, "_DDC"))
975 device->cap._DDC = 1;
976 }
977
978 /*
979 * Arg:
980 * device : video output device (VGA)
981 *
982 * Return Value:
983 * None
984 *
985 * Find out all required AML methods defined under the video bus device.
986 */
987
988 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
989 {
990 if (acpi_has_method(video->device->handle, "_DOS"))
991 video->cap._DOS = 1;
992 if (acpi_has_method(video->device->handle, "_DOD"))
993 video->cap._DOD = 1;
994 if (acpi_has_method(video->device->handle, "_ROM"))
995 video->cap._ROM = 1;
996 if (acpi_has_method(video->device->handle, "_GPD"))
997 video->cap._GPD = 1;
998 if (acpi_has_method(video->device->handle, "_SPD"))
999 video->cap._SPD = 1;
1000 if (acpi_has_method(video->device->handle, "_VPO"))
1001 video->cap._VPO = 1;
1002 }
1003
1004 /*
1005 * Check whether the video bus device has required AML method to
1006 * support the desired features
1007 */
1008
1009 static int acpi_video_bus_check(struct acpi_video_bus *video)
1010 {
1011 acpi_status status = -ENOENT;
1012 struct pci_dev *dev;
1013
1014 if (!video)
1015 return -EINVAL;
1016
1017 dev = acpi_get_pci_dev(video->device->handle);
1018 if (!dev)
1019 return -ENODEV;
1020 pci_dev_put(dev);
1021
1022 /*
1023 * Since there is no HID, CID and so on for VGA driver, we have
1024 * to check well known required nodes.
1025 */
1026
1027 /* Does this device support video switching? */
1028 if (video->cap._DOS || video->cap._DOD) {
1029 if (!video->cap._DOS) {
1030 printk(KERN_WARNING FW_BUG
1031 "ACPI(%s) defines _DOD but not _DOS\n",
1032 acpi_device_bid(video->device));
1033 }
1034 video->flags.multihead = 1;
1035 status = 0;
1036 }
1037
1038 /* Does this device support retrieving a video ROM? */
1039 if (video->cap._ROM) {
1040 video->flags.rom = 1;
1041 status = 0;
1042 }
1043
1044 /* Does this device support configuring which video device to POST? */
1045 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1046 video->flags.post = 1;
1047 status = 0;
1048 }
1049
1050 return status;
1051 }
1052
1053 /*
1054 * --------------------------------------------------------------------------
1055 * Driver Interface
1056 * --------------------------------------------------------------------------
1057 */
1058
1059 /* device interface */
1060 static struct acpi_video_device_attrib *
1061 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1062 {
1063 struct acpi_video_enumerated_device *ids;
1064 int i;
1065
1066 for (i = 0; i < video->attached_count; i++) {
1067 ids = &video->attached_array[i];
1068 if ((ids->value.int_val & 0xffff) == device_id)
1069 return &ids->value.attrib;
1070 }
1071
1072 return NULL;
1073 }
1074
1075 static int
1076 acpi_video_get_device_type(struct acpi_video_bus *video,
1077 unsigned long device_id)
1078 {
1079 struct acpi_video_enumerated_device *ids;
1080 int i;
1081
1082 for (i = 0; i < video->attached_count; i++) {
1083 ids = &video->attached_array[i];
1084 if ((ids->value.int_val & 0xffff) == device_id)
1085 return ids->value.int_val;
1086 }
1087
1088 return 0;
1089 }
1090
1091 static int
1092 acpi_video_bus_get_one_device(struct acpi_device *device,
1093 struct acpi_video_bus *video)
1094 {
1095 unsigned long long device_id;
1096 int status, device_type;
1097 struct acpi_video_device *data;
1098 struct acpi_video_device_attrib *attribute;
1099
1100 status =
1101 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1102 /* Some device omits _ADR, we skip them instead of fail */
1103 if (ACPI_FAILURE(status))
1104 return 0;
1105
1106 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1107 if (!data)
1108 return -ENOMEM;
1109
1110 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1111 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1112 device->driver_data = data;
1113
1114 data->device_id = device_id;
1115 data->video = video;
1116 data->dev = device;
1117
1118 attribute = acpi_video_get_device_attr(video, device_id);
1119
1120 if (attribute && attribute->device_id_scheme) {
1121 switch (attribute->display_type) {
1122 case ACPI_VIDEO_DISPLAY_CRT:
1123 data->flags.crt = 1;
1124 break;
1125 case ACPI_VIDEO_DISPLAY_TV:
1126 data->flags.tvout = 1;
1127 break;
1128 case ACPI_VIDEO_DISPLAY_DVI:
1129 data->flags.dvi = 1;
1130 break;
1131 case ACPI_VIDEO_DISPLAY_LCD:
1132 data->flags.lcd = 1;
1133 break;
1134 default:
1135 data->flags.unknown = 1;
1136 break;
1137 }
1138 if (attribute->bios_can_detect)
1139 data->flags.bios = 1;
1140 } else {
1141 /* Check for legacy IDs */
1142 device_type = acpi_video_get_device_type(video, device_id);
1143 /* Ignore bits 16 and 18-20 */
1144 switch (device_type & 0xffe2ffff) {
1145 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1146 data->flags.crt = 1;
1147 break;
1148 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1149 data->flags.lcd = 1;
1150 break;
1151 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1152 data->flags.tvout = 1;
1153 break;
1154 default:
1155 data->flags.unknown = 1;
1156 }
1157 }
1158
1159 acpi_video_device_bind(video, data);
1160 acpi_video_device_find_cap(data);
1161
1162 mutex_lock(&video->device_list_lock);
1163 list_add_tail(&data->entry, &video->video_device_list);
1164 mutex_unlock(&video->device_list_lock);
1165
1166 return status;
1167 }
1168
1169 /*
1170 * Arg:
1171 * video : video bus device
1172 *
1173 * Return:
1174 * none
1175 *
1176 * Enumerate the video device list of the video bus,
1177 * bind the ids with the corresponding video devices
1178 * under the video bus.
1179 */
1180
1181 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1182 {
1183 struct acpi_video_device *dev;
1184
1185 mutex_lock(&video->device_list_lock);
1186
1187 list_for_each_entry(dev, &video->video_device_list, entry)
1188 acpi_video_device_bind(video, dev);
1189
1190 mutex_unlock(&video->device_list_lock);
1191 }
1192
1193 /*
1194 * Arg:
1195 * video : video bus device
1196 * device : video output device under the video
1197 * bus
1198 *
1199 * Return:
1200 * none
1201 *
1202 * Bind the ids with the corresponding video devices
1203 * under the video bus.
1204 */
1205
1206 static void
1207 acpi_video_device_bind(struct acpi_video_bus *video,
1208 struct acpi_video_device *device)
1209 {
1210 struct acpi_video_enumerated_device *ids;
1211 int i;
1212
1213 for (i = 0; i < video->attached_count; i++) {
1214 ids = &video->attached_array[i];
1215 if (device->device_id == (ids->value.int_val & 0xffff)) {
1216 ids->bind_info = device;
1217 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1218 }
1219 }
1220 }
1221
1222 /*
1223 * Arg:
1224 * video : video bus device
1225 *
1226 * Return:
1227 * < 0 : error
1228 *
1229 * Call _DOD to enumerate all devices attached to display adapter
1230 *
1231 */
1232
1233 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1234 {
1235 int status;
1236 int count;
1237 int i;
1238 struct acpi_video_enumerated_device *active_list;
1239 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1240 union acpi_object *dod = NULL;
1241 union acpi_object *obj;
1242
1243 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1244 if (!ACPI_SUCCESS(status)) {
1245 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1246 return status;
1247 }
1248
1249 dod = buffer.pointer;
1250 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1251 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1252 status = -EFAULT;
1253 goto out;
1254 }
1255
1256 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1257 dod->package.count));
1258
1259 active_list = kcalloc(1 + dod->package.count,
1260 sizeof(struct acpi_video_enumerated_device),
1261 GFP_KERNEL);
1262 if (!active_list) {
1263 status = -ENOMEM;
1264 goto out;
1265 }
1266
1267 count = 0;
1268 for (i = 0; i < dod->package.count; i++) {
1269 obj = &dod->package.elements[i];
1270
1271 if (obj->type != ACPI_TYPE_INTEGER) {
1272 printk(KERN_ERR PREFIX
1273 "Invalid _DOD data in element %d\n", i);
1274 continue;
1275 }
1276
1277 active_list[count].value.int_val = obj->integer.value;
1278 active_list[count].bind_info = NULL;
1279 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1280 (int)obj->integer.value));
1281 count++;
1282 }
1283
1284 kfree(video->attached_array);
1285
1286 video->attached_array = active_list;
1287 video->attached_count = count;
1288
1289 out:
1290 kfree(buffer.pointer);
1291 return status;
1292 }
1293
1294 static int
1295 acpi_video_get_next_level(struct acpi_video_device *device,
1296 u32 level_current, u32 event)
1297 {
1298 int min, max, min_above, max_below, i, l, delta = 255;
1299 max = max_below = 0;
1300 min = min_above = 255;
1301 /* Find closest level to level_current */
1302 for (i = 2; i < device->brightness->count; i++) {
1303 l = device->brightness->levels[i];
1304 if (abs(l - level_current) < abs(delta)) {
1305 delta = l - level_current;
1306 if (!delta)
1307 break;
1308 }
1309 }
1310 /* Ajust level_current to closest available level */
1311 level_current += delta;
1312 for (i = 2; i < device->brightness->count; i++) {
1313 l = device->brightness->levels[i];
1314 if (l < min)
1315 min = l;
1316 if (l > max)
1317 max = l;
1318 if (l < min_above && l > level_current)
1319 min_above = l;
1320 if (l > max_below && l < level_current)
1321 max_below = l;
1322 }
1323
1324 switch (event) {
1325 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1326 return (level_current < max) ? min_above : min;
1327 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1328 return (level_current < max) ? min_above : max;
1329 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1330 return (level_current > min) ? max_below : min;
1331 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1332 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1333 return 0;
1334 default:
1335 return level_current;
1336 }
1337 }
1338
1339 static int
1340 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1341 {
1342 unsigned long long level_current, level_next;
1343 int result = -EINVAL;
1344
1345 /* no warning message if acpi_backlight=vendor or a quirk is used */
1346 if (!acpi_video_verify_backlight_support())
1347 return 0;
1348
1349 if (!device->brightness)
1350 goto out;
1351
1352 result = acpi_video_device_lcd_get_level_current(device,
1353 &level_current,
1354 false);
1355 if (result)
1356 goto out;
1357
1358 level_next = acpi_video_get_next_level(device, level_current, event);
1359
1360 result = acpi_video_device_lcd_set_level(device, level_next);
1361
1362 if (!result)
1363 backlight_force_update(device->backlight,
1364 BACKLIGHT_UPDATE_HOTKEY);
1365
1366 out:
1367 if (result)
1368 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1369
1370 return result;
1371 }
1372
1373 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1374 void **edid)
1375 {
1376 struct acpi_video_bus *video;
1377 struct acpi_video_device *video_device;
1378 union acpi_object *buffer = NULL;
1379 acpi_status status;
1380 int i, length;
1381
1382 if (!device || !acpi_driver_data(device))
1383 return -EINVAL;
1384
1385 video = acpi_driver_data(device);
1386
1387 for (i = 0; i < video->attached_count; i++) {
1388 video_device = video->attached_array[i].bind_info;
1389 length = 256;
1390
1391 if (!video_device)
1392 continue;
1393
1394 if (!video_device->cap._DDC)
1395 continue;
1396
1397 if (type) {
1398 switch (type) {
1399 case ACPI_VIDEO_DISPLAY_CRT:
1400 if (!video_device->flags.crt)
1401 continue;
1402 break;
1403 case ACPI_VIDEO_DISPLAY_TV:
1404 if (!video_device->flags.tvout)
1405 continue;
1406 break;
1407 case ACPI_VIDEO_DISPLAY_DVI:
1408 if (!video_device->flags.dvi)
1409 continue;
1410 break;
1411 case ACPI_VIDEO_DISPLAY_LCD:
1412 if (!video_device->flags.lcd)
1413 continue;
1414 break;
1415 }
1416 } else if (video_device->device_id != device_id) {
1417 continue;
1418 }
1419
1420 status = acpi_video_device_EDID(video_device, &buffer, length);
1421
1422 if (ACPI_FAILURE(status) || !buffer ||
1423 buffer->type != ACPI_TYPE_BUFFER) {
1424 length = 128;
1425 status = acpi_video_device_EDID(video_device, &buffer,
1426 length);
1427 if (ACPI_FAILURE(status) || !buffer ||
1428 buffer->type != ACPI_TYPE_BUFFER) {
1429 continue;
1430 }
1431 }
1432
1433 *edid = buffer->buffer.pointer;
1434 return length;
1435 }
1436
1437 return -ENODEV;
1438 }
1439 EXPORT_SYMBOL(acpi_video_get_edid);
1440
1441 static int
1442 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1443 struct acpi_device *device)
1444 {
1445 int status = 0;
1446 struct acpi_device *dev;
1447
1448 /*
1449 * There are systems where video module known to work fine regardless
1450 * of broken _DOD and ignoring returned value here doesn't cause
1451 * any issues later.
1452 */
1453 acpi_video_device_enumerate(video);
1454
1455 list_for_each_entry(dev, &device->children, node) {
1456
1457 status = acpi_video_bus_get_one_device(dev, video);
1458 if (status) {
1459 dev_err(&dev->dev, "Can't attach device\n");
1460 break;
1461 }
1462 }
1463 return status;
1464 }
1465
1466 /* acpi_video interface */
1467
1468 /*
1469 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1470 * preform any automatic brightness change on receiving a notification.
1471 */
1472 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1473 {
1474 return acpi_video_bus_DOS(video, 0,
1475 acpi_osi_is_win8() ? 1 : 0);
1476 }
1477
1478 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1479 {
1480 return acpi_video_bus_DOS(video, 0,
1481 acpi_osi_is_win8() ? 0 : 1);
1482 }
1483
1484 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1485 {
1486 struct acpi_video_bus *video = acpi_driver_data(device);
1487 struct input_dev *input;
1488 int keycode = 0;
1489
1490 if (!video || !video->input)
1491 return;
1492
1493 input = video->input;
1494
1495 switch (event) {
1496 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1497 * most likely via hotkey. */
1498 keycode = KEY_SWITCHVIDEOMODE;
1499 break;
1500
1501 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1502 * connector. */
1503 acpi_video_device_enumerate(video);
1504 acpi_video_device_rebind(video);
1505 keycode = KEY_SWITCHVIDEOMODE;
1506 break;
1507
1508 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1509 keycode = KEY_SWITCHVIDEOMODE;
1510 break;
1511 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1512 keycode = KEY_VIDEO_NEXT;
1513 break;
1514 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1515 keycode = KEY_VIDEO_PREV;
1516 break;
1517
1518 default:
1519 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1520 "Unsupported event [0x%x]\n", event));
1521 break;
1522 }
1523
1524 if (acpi_notifier_call_chain(device, event, 0))
1525 /* Something vetoed the keypress. */
1526 keycode = 0;
1527
1528 if (keycode) {
1529 input_report_key(input, keycode, 1);
1530 input_sync(input);
1531 input_report_key(input, keycode, 0);
1532 input_sync(input);
1533 }
1534
1535 return;
1536 }
1537
1538 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1539 {
1540 struct acpi_video_device *video_device = data;
1541 struct acpi_device *device = NULL;
1542 struct acpi_video_bus *bus;
1543 struct input_dev *input;
1544 int keycode = 0;
1545
1546 if (!video_device)
1547 return;
1548
1549 device = video_device->dev;
1550 bus = video_device->video;
1551 input = bus->input;
1552
1553 switch (event) {
1554 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1555 if (brightness_switch_enabled)
1556 acpi_video_switch_brightness(video_device, event);
1557 keycode = KEY_BRIGHTNESS_CYCLE;
1558 break;
1559 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1560 if (brightness_switch_enabled)
1561 acpi_video_switch_brightness(video_device, event);
1562 keycode = KEY_BRIGHTNESSUP;
1563 break;
1564 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1565 if (brightness_switch_enabled)
1566 acpi_video_switch_brightness(video_device, event);
1567 keycode = KEY_BRIGHTNESSDOWN;
1568 break;
1569 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1570 if (brightness_switch_enabled)
1571 acpi_video_switch_brightness(video_device, event);
1572 keycode = KEY_BRIGHTNESS_ZERO;
1573 break;
1574 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1575 if (brightness_switch_enabled)
1576 acpi_video_switch_brightness(video_device, event);
1577 keycode = KEY_DISPLAY_OFF;
1578 break;
1579 default:
1580 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1581 "Unsupported event [0x%x]\n", event));
1582 break;
1583 }
1584
1585 acpi_notifier_call_chain(device, event, 0);
1586
1587 if (keycode) {
1588 input_report_key(input, keycode, 1);
1589 input_sync(input);
1590 input_report_key(input, keycode, 0);
1591 input_sync(input);
1592 }
1593
1594 return;
1595 }
1596
1597 static int acpi_video_resume(struct notifier_block *nb,
1598 unsigned long val, void *ign)
1599 {
1600 struct acpi_video_bus *video;
1601 struct acpi_video_device *video_device;
1602 int i;
1603
1604 switch (val) {
1605 case PM_HIBERNATION_PREPARE:
1606 case PM_SUSPEND_PREPARE:
1607 case PM_RESTORE_PREPARE:
1608 return NOTIFY_DONE;
1609 }
1610
1611 video = container_of(nb, struct acpi_video_bus, pm_nb);
1612
1613 dev_info(&video->device->dev, "Restoring backlight state\n");
1614
1615 for (i = 0; i < video->attached_count; i++) {
1616 video_device = video->attached_array[i].bind_info;
1617 if (video_device && video_device->backlight)
1618 acpi_video_set_brightness(video_device->backlight);
1619 }
1620
1621 return NOTIFY_OK;
1622 }
1623
1624 static acpi_status
1625 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1626 void **return_value)
1627 {
1628 struct acpi_device *device = context;
1629 struct acpi_device *sibling;
1630 int result;
1631
1632 if (handle == device->handle)
1633 return AE_CTRL_TERMINATE;
1634
1635 result = acpi_bus_get_device(handle, &sibling);
1636 if (result)
1637 return AE_OK;
1638
1639 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1640 return AE_ALREADY_EXISTS;
1641
1642 return AE_OK;
1643 }
1644
1645 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1646 {
1647 if (acpi_video_verify_backlight_support()) {
1648 struct backlight_properties props;
1649 struct pci_dev *pdev;
1650 acpi_handle acpi_parent;
1651 struct device *parent = NULL;
1652 int result;
1653 static int count;
1654 char *name;
1655
1656 result = acpi_video_init_brightness(device);
1657 if (result)
1658 return;
1659 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1660 if (!name)
1661 return;
1662 count++;
1663
1664 acpi_get_parent(device->dev->handle, &acpi_parent);
1665
1666 pdev = acpi_get_pci_dev(acpi_parent);
1667 if (pdev) {
1668 parent = &pdev->dev;
1669 pci_dev_put(pdev);
1670 }
1671
1672 memset(&props, 0, sizeof(struct backlight_properties));
1673 props.type = BACKLIGHT_FIRMWARE;
1674 props.max_brightness = device->brightness->count - 3;
1675 device->backlight = backlight_device_register(name,
1676 parent,
1677 device,
1678 &acpi_backlight_ops,
1679 &props);
1680 kfree(name);
1681 if (IS_ERR(device->backlight))
1682 return;
1683
1684 /*
1685 * Save current brightness level in case we have to restore it
1686 * before acpi_video_device_lcd_set_level() is called next time.
1687 */
1688 device->backlight->props.brightness =
1689 acpi_video_get_brightness(device->backlight);
1690
1691 device->cooling_dev = thermal_cooling_device_register("LCD",
1692 device->dev, &video_cooling_ops);
1693 if (IS_ERR(device->cooling_dev)) {
1694 /*
1695 * Set cooling_dev to NULL so we don't crash trying to
1696 * free it.
1697 * Also, why the hell we are returning early and
1698 * not attempt to register video output if cooling
1699 * device registration failed?
1700 * -- dtor
1701 */
1702 device->cooling_dev = NULL;
1703 return;
1704 }
1705
1706 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1707 device->cooling_dev->id);
1708 result = sysfs_create_link(&device->dev->dev.kobj,
1709 &device->cooling_dev->device.kobj,
1710 "thermal_cooling");
1711 if (result)
1712 printk(KERN_ERR PREFIX "Create sysfs link\n");
1713 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1714 &device->dev->dev.kobj, "device");
1715 if (result)
1716 printk(KERN_ERR PREFIX "Create sysfs link\n");
1717 }
1718 }
1719
1720 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1721 {
1722 struct acpi_video_device *dev;
1723
1724 mutex_lock(&video->device_list_lock);
1725 list_for_each_entry(dev, &video->video_device_list, entry)
1726 acpi_video_dev_register_backlight(dev);
1727 mutex_unlock(&video->device_list_lock);
1728
1729 video->pm_nb.notifier_call = acpi_video_resume;
1730 video->pm_nb.priority = 0;
1731 return register_pm_notifier(&video->pm_nb);
1732 }
1733
1734 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1735 {
1736 if (device->backlight) {
1737 backlight_device_unregister(device->backlight);
1738 device->backlight = NULL;
1739 }
1740 if (device->brightness) {
1741 kfree(device->brightness->levels);
1742 kfree(device->brightness);
1743 device->brightness = NULL;
1744 }
1745 if (device->cooling_dev) {
1746 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1747 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1748 thermal_cooling_device_unregister(device->cooling_dev);
1749 device->cooling_dev = NULL;
1750 }
1751 }
1752
1753 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1754 {
1755 struct acpi_video_device *dev;
1756 int error = unregister_pm_notifier(&video->pm_nb);
1757
1758 mutex_lock(&video->device_list_lock);
1759 list_for_each_entry(dev, &video->video_device_list, entry)
1760 acpi_video_dev_unregister_backlight(dev);
1761 mutex_unlock(&video->device_list_lock);
1762
1763 return error;
1764 }
1765
1766 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1767 {
1768 acpi_status status;
1769 struct acpi_device *adev = device->dev;
1770
1771 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1772 acpi_video_device_notify, device);
1773 if (ACPI_FAILURE(status))
1774 dev_err(&adev->dev, "Error installing notify handler\n");
1775 else
1776 device->flags.notify = 1;
1777 }
1778
1779 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1780 {
1781 struct input_dev *input;
1782 struct acpi_video_device *dev;
1783 int error;
1784
1785 video->input = input = input_allocate_device();
1786 if (!input) {
1787 error = -ENOMEM;
1788 goto out;
1789 }
1790
1791 error = acpi_video_bus_start_devices(video);
1792 if (error)
1793 goto err_free_input;
1794
1795 snprintf(video->phys, sizeof(video->phys),
1796 "%s/video/input0", acpi_device_hid(video->device));
1797
1798 input->name = acpi_device_name(video->device);
1799 input->phys = video->phys;
1800 input->id.bustype = BUS_HOST;
1801 input->id.product = 0x06;
1802 input->dev.parent = &video->device->dev;
1803 input->evbit[0] = BIT(EV_KEY);
1804 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1805 set_bit(KEY_VIDEO_NEXT, input->keybit);
1806 set_bit(KEY_VIDEO_PREV, input->keybit);
1807 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1808 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1809 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1810 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1811 set_bit(KEY_DISPLAY_OFF, input->keybit);
1812
1813 error = input_register_device(input);
1814 if (error)
1815 goto err_stop_dev;
1816
1817 mutex_lock(&video->device_list_lock);
1818 list_for_each_entry(dev, &video->video_device_list, entry)
1819 acpi_video_dev_add_notify_handler(dev);
1820 mutex_unlock(&video->device_list_lock);
1821
1822 return 0;
1823
1824 err_stop_dev:
1825 acpi_video_bus_stop_devices(video);
1826 err_free_input:
1827 input_free_device(input);
1828 video->input = NULL;
1829 out:
1830 return error;
1831 }
1832
1833 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1834 {
1835 if (dev->flags.notify) {
1836 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1837 acpi_video_device_notify);
1838 dev->flags.notify = 0;
1839 }
1840 }
1841
1842 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1843 {
1844 struct acpi_video_device *dev;
1845
1846 mutex_lock(&video->device_list_lock);
1847 list_for_each_entry(dev, &video->video_device_list, entry)
1848 acpi_video_dev_remove_notify_handler(dev);
1849 mutex_unlock(&video->device_list_lock);
1850
1851 acpi_video_bus_stop_devices(video);
1852 input_unregister_device(video->input);
1853 video->input = NULL;
1854 }
1855
1856 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1857 {
1858 struct acpi_video_device *dev, *next;
1859
1860 mutex_lock(&video->device_list_lock);
1861 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1862 list_del(&dev->entry);
1863 kfree(dev);
1864 }
1865 mutex_unlock(&video->device_list_lock);
1866
1867 return 0;
1868 }
1869
1870 static int instance;
1871
1872 static int acpi_video_bus_add(struct acpi_device *device)
1873 {
1874 struct acpi_video_bus *video;
1875 int error;
1876 acpi_status status;
1877
1878 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1879 device->parent->handle, 1,
1880 acpi_video_bus_match, NULL,
1881 device, NULL);
1882 if (status == AE_ALREADY_EXISTS) {
1883 printk(KERN_WARNING FW_BUG
1884 "Duplicate ACPI video bus devices for the"
1885 " same VGA controller, please try module "
1886 "parameter \"video.allow_duplicates=1\""
1887 "if the current driver doesn't work.\n");
1888 if (!allow_duplicates)
1889 return -ENODEV;
1890 }
1891
1892 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1893 if (!video)
1894 return -ENOMEM;
1895
1896 /* a hack to fix the duplicate name "VID" problem on T61 */
1897 if (!strcmp(device->pnp.bus_id, "VID")) {
1898 if (instance)
1899 device->pnp.bus_id[3] = '0' + instance;
1900 instance++;
1901 }
1902 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1903 if (!strcmp(device->pnp.bus_id, "VGA")) {
1904 if (instance)
1905 device->pnp.bus_id[3] = '0' + instance;
1906 instance++;
1907 }
1908
1909 video->device = device;
1910 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1911 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1912 device->driver_data = video;
1913
1914 acpi_video_bus_find_cap(video);
1915 error = acpi_video_bus_check(video);
1916 if (error)
1917 goto err_free_video;
1918
1919 mutex_init(&video->device_list_lock);
1920 INIT_LIST_HEAD(&video->video_device_list);
1921
1922 error = acpi_video_bus_get_devices(video, device);
1923 if (error)
1924 goto err_put_video;
1925
1926 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
1927 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1928 video->flags.multihead ? "yes" : "no",
1929 video->flags.rom ? "yes" : "no",
1930 video->flags.post ? "yes" : "no");
1931 mutex_lock(&video_list_lock);
1932 list_add_tail(&video->entry, &video_bus_head);
1933 mutex_unlock(&video_list_lock);
1934
1935 acpi_video_bus_register_backlight(video);
1936 acpi_video_bus_add_notify_handler(video);
1937
1938 return 0;
1939
1940 err_put_video:
1941 acpi_video_bus_put_devices(video);
1942 kfree(video->attached_array);
1943 err_free_video:
1944 kfree(video);
1945 device->driver_data = NULL;
1946
1947 return error;
1948 }
1949
1950 static int acpi_video_bus_remove(struct acpi_device *device)
1951 {
1952 struct acpi_video_bus *video = NULL;
1953
1954
1955 if (!device || !acpi_driver_data(device))
1956 return -EINVAL;
1957
1958 video = acpi_driver_data(device);
1959
1960 acpi_video_bus_remove_notify_handler(video);
1961 acpi_video_bus_unregister_backlight(video);
1962 acpi_video_bus_put_devices(video);
1963
1964 mutex_lock(&video_list_lock);
1965 list_del(&video->entry);
1966 mutex_unlock(&video_list_lock);
1967
1968 kfree(video->attached_array);
1969 kfree(video);
1970
1971 return 0;
1972 }
1973
1974 static int __init is_i740(struct pci_dev *dev)
1975 {
1976 if (dev->device == 0x00D1)
1977 return 1;
1978 if (dev->device == 0x7000)
1979 return 1;
1980 return 0;
1981 }
1982
1983 static int __init intel_opregion_present(void)
1984 {
1985 int opregion = 0;
1986 struct pci_dev *dev = NULL;
1987 u32 address;
1988
1989 for_each_pci_dev(dev) {
1990 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1991 continue;
1992 if (dev->vendor != PCI_VENDOR_ID_INTEL)
1993 continue;
1994 /* We don't want to poke around undefined i740 registers */
1995 if (is_i740(dev))
1996 continue;
1997 pci_read_config_dword(dev, 0xfc, &address);
1998 if (!address)
1999 continue;
2000 opregion = 1;
2001 }
2002 return opregion;
2003 }
2004
2005 int acpi_video_register(void)
2006 {
2007 int result = 0;
2008 if (register_count) {
2009 /*
2010 * if the function of acpi_video_register is already called,
2011 * don't register the acpi_vide_bus again and return no error.
2012 */
2013 return 0;
2014 }
2015
2016 mutex_init(&video_list_lock);
2017 INIT_LIST_HEAD(&video_bus_head);
2018
2019 result = acpi_bus_register_driver(&acpi_video_bus);
2020 if (result < 0)
2021 return -ENODEV;
2022
2023 /*
2024 * When the acpi_video_bus is loaded successfully, increase
2025 * the counter reference.
2026 */
2027 register_count = 1;
2028
2029 return 0;
2030 }
2031 EXPORT_SYMBOL(acpi_video_register);
2032
2033 void acpi_video_unregister(void)
2034 {
2035 if (!register_count) {
2036 /*
2037 * If the acpi video bus is already unloaded, don't
2038 * unload it again and return directly.
2039 */
2040 return;
2041 }
2042 acpi_bus_unregister_driver(&acpi_video_bus);
2043
2044 register_count = 0;
2045
2046 return;
2047 }
2048 EXPORT_SYMBOL(acpi_video_unregister);
2049
2050 /*
2051 * This is kind of nasty. Hardware using Intel chipsets may require
2052 * the video opregion code to be run first in order to initialise
2053 * state before any ACPI video calls are made. To handle this we defer
2054 * registration of the video class until the opregion code has run.
2055 */
2056
2057 static int __init acpi_video_init(void)
2058 {
2059 dmi_check_system(video_dmi_table);
2060
2061 if (intel_opregion_present())
2062 return 0;
2063
2064 return acpi_video_register();
2065 }
2066
2067 static void __exit acpi_video_exit(void)
2068 {
2069 acpi_video_unregister();
2070
2071 return;
2072 }
2073
2074 module_init(acpi_video_init);
2075 module_exit(acpi_video_exit);
Linux kernel - Deliverables
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