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ext4: reduce contention on s_orphan_lock
[linux/fpc-iii.git] / drivers / acpi / video.c
blob8b6990e417ec870d7c77e42c994b1e2245b3b88e
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 T430s",
461 .matches = {
462 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
463 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T430s"),
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 X1 Carbon",
477 .matches = {
478 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
479 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X1 Carbon"),
480 },
481 },
482 {
483 .callback = video_set_use_native_backlight,
484 .ident = "Lenovo Yoga 13",
485 .matches = {
486 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
487 DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo IdeaPad Yoga 13"),
488 },
489 },
490 {
491 .callback = video_set_use_native_backlight,
492 .ident = "Thinkpad Helix",
493 .matches = {
494 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
495 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad Helix"),
496 },
497 },
498 {
499 .callback = video_set_use_native_backlight,
500 .ident = "Dell Inspiron 7520",
501 .matches = {
502 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
503 DMI_MATCH(DMI_PRODUCT_VERSION, "Inspiron 7520"),
504 },
505 },
506 {
507 .callback = video_set_use_native_backlight,
508 .ident = "Acer Aspire 5733Z",
509 .matches = {
510 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
511 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5733Z"),
512 },
513 },
514 {
515 .callback = video_set_use_native_backlight,
516 .ident = "Acer Aspire V5-431",
517 .matches = {
518 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
519 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-431"),
520 },
521 },
522 {
523 .callback = video_set_use_native_backlight,
524 .ident = "HP ProBook 4340s",
525 .matches = {
526 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
527 DMI_MATCH(DMI_PRODUCT_VERSION, "HP ProBook 4340s"),
528 },
529 },
530 {
531 .callback = video_set_use_native_backlight,
532 .ident = "HP ProBook 2013 models",
533 .matches = {
534 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
535 DMI_MATCH(DMI_PRODUCT_NAME, "HP ProBook "),
536 DMI_MATCH(DMI_PRODUCT_NAME, " G1"),
537 },
538 },
539 {
540 .callback = video_set_use_native_backlight,
541 .ident = "HP EliteBook 2013 models",
542 .matches = {
543 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
544 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook "),
545 DMI_MATCH(DMI_PRODUCT_NAME, " G1"),
546 },
547 },
548 {
549 .callback = video_set_use_native_backlight,
550 .ident = "HP ZBook 14",
551 .matches = {
552 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
553 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 14"),
554 },
555 },
556 {
557 .callback = video_set_use_native_backlight,
558 .ident = "HP ZBook 15",
559 .matches = {
560 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
561 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 15"),
562 },
563 },
564 {
565 .callback = video_set_use_native_backlight,
566 .ident = "HP ZBook 17",
567 .matches = {
568 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
569 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 17"),
570 },
571 },
572 {
573 .callback = video_set_use_native_backlight,
574 .ident = "HP EliteBook 8780w",
575 .matches = {
576 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
577 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8780w"),
578 },
579 },
580 {}
581 };
582
583 static unsigned long long
584 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
585 unsigned long long bqc_value)
586 {
587 unsigned long long level;
588
589 if (device->brightness->flags._BQC_use_index) {
590 /*
591 * _BQC returns an index that doesn't account for
592 * the first 2 items with special meaning, so we need
593 * to compensate for that by offsetting ourselves
594 */
595 if (device->brightness->flags._BCL_reversed)
596 bqc_value = device->brightness->count - 3 - bqc_value;
597
598 level = device->brightness->levels[bqc_value + 2];
599 } else {
600 level = bqc_value;
601 }
602
603 level += bqc_offset_aml_bug_workaround;
604
605 return level;
606 }
607
608 static int
609 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
610 unsigned long long *level, bool raw)
611 {
612 acpi_status status = AE_OK;
613 int i;
614
615 if (device->cap._BQC || device->cap._BCQ) {
616 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
617
618 status = acpi_evaluate_integer(device->dev->handle, buf,
619 NULL, level);
620 if (ACPI_SUCCESS(status)) {
621 if (raw) {
622 /*
623 * Caller has indicated he wants the raw
624 * value returned by _BQC, so don't furtherly
625 * mess with the value.
626 */
627 return 0;
628 }
629
630 *level = acpi_video_bqc_value_to_level(device, *level);
631
632 for (i = 2; i < device->brightness->count; i++)
633 if (device->brightness->levels[i] == *level) {
634 device->brightness->curr = *level;
635 return 0;
636 }
637 /*
638 * BQC returned an invalid level.
639 * Stop using it.
640 */
641 ACPI_WARNING((AE_INFO,
642 "%s returned an invalid level",
643 buf));
644 device->cap._BQC = device->cap._BCQ = 0;
645 } else {
646 /*
647 * Fixme:
648 * should we return an error or ignore this failure?
649 * dev->brightness->curr is a cached value which stores
650 * the correct current backlight level in most cases.
651 * ACPI video backlight still works w/ buggy _BQC.
652 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
653 */
654 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
655 device->cap._BQC = device->cap._BCQ = 0;
656 }
657 }
658
659 *level = device->brightness->curr;
660 return 0;
661 }
662
663 static int
664 acpi_video_device_EDID(struct acpi_video_device *device,
665 union acpi_object **edid, ssize_t length)
666 {
667 int status;
668 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
669 union acpi_object *obj;
670 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
671 struct acpi_object_list args = { 1, &arg0 };
672
673
674 *edid = NULL;
675
676 if (!device)
677 return -ENODEV;
678 if (length == 128)
679 arg0.integer.value = 1;
680 else if (length == 256)
681 arg0.integer.value = 2;
682 else
683 return -EINVAL;
684
685 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
686 if (ACPI_FAILURE(status))
687 return -ENODEV;
688
689 obj = buffer.pointer;
690
691 if (obj && obj->type == ACPI_TYPE_BUFFER)
692 *edid = obj;
693 else {
694 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
695 status = -EFAULT;
696 kfree(obj);
697 }
698
699 return status;
700 }
701
702 /* bus */
703
704 /*
705 * Arg:
706 * video : video bus device pointer
707 * bios_flag :
708 * 0. The system BIOS should NOT automatically switch(toggle)
709 * the active display output.
710 * 1. The system BIOS should automatically switch (toggle) the
711 * active display output. No switch event.
712 * 2. The _DGS value should be locked.
713 * 3. The system BIOS should not automatically switch (toggle) the
714 * active display output, but instead generate the display switch
715 * event notify code.
716 * lcd_flag :
717 * 0. The system BIOS should automatically control the brightness level
718 * of the LCD when the power changes from AC to DC
719 * 1. The system BIOS should NOT automatically control the brightness
720 * level of the LCD when the power changes from AC to DC.
721 * Return Value:
722 * -EINVAL wrong arg.
723 */
724
725 static int
726 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
727 {
728 acpi_status status;
729
730 if (!video->cap._DOS)
731 return 0;
732
733 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
734 return -EINVAL;
735 video->dos_setting = (lcd_flag << 2) | bios_flag;
736 status = acpi_execute_simple_method(video->device->handle, "_DOS",
737 (lcd_flag << 2) | bios_flag);
738 if (ACPI_FAILURE(status))
739 return -EIO;
740
741 return 0;
742 }
743
744 /*
745 * Simple comparison function used to sort backlight levels.
746 */
747
748 static int
749 acpi_video_cmp_level(const void *a, const void *b)
750 {
751 return *(int *)a - *(int *)b;
752 }
753
754 /*
755 * Decides if _BQC/_BCQ for this system is usable
756 *
757 * We do this by changing the level first and then read out the current
758 * brightness level, if the value does not match, find out if it is using
759 * index. If not, clear the _BQC/_BCQ capability.
760 */
761 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
762 int max_level, int current_level)
763 {
764 struct acpi_video_device_brightness *br = device->brightness;
765 int result;
766 unsigned long long level;
767 int test_level;
768
769 /* don't mess with existing known broken systems */
770 if (bqc_offset_aml_bug_workaround)
771 return 0;
772
773 /*
774 * Some systems always report current brightness level as maximum
775 * through _BQC, we need to test another value for them.
776 */
777 test_level = current_level == max_level ? br->levels[3] : max_level;
778
779 result = acpi_video_device_lcd_set_level(device, test_level);
780 if (result)
781 return result;
782
783 result = acpi_video_device_lcd_get_level_current(device, &level, true);
784 if (result)
785 return result;
786
787 if (level != test_level) {
788 /* buggy _BQC found, need to find out if it uses index */
789 if (level < br->count) {
790 if (br->flags._BCL_reversed)
791 level = br->count - 3 - level;
792 if (br->levels[level + 2] == test_level)
793 br->flags._BQC_use_index = 1;
794 }
795
796 if (!br->flags._BQC_use_index)
797 device->cap._BQC = device->cap._BCQ = 0;
798 }
799
800 return 0;
801 }
802
803
804 /*
805 * Arg:
806 * device : video output device (LCD, CRT, ..)
807 *
808 * Return Value:
809 * Maximum brightness level
810 *
811 * Allocate and initialize device->brightness.
812 */
813
814 static int
815 acpi_video_init_brightness(struct acpi_video_device *device)
816 {
817 union acpi_object *obj = NULL;
818 int i, max_level = 0, count = 0, level_ac_battery = 0;
819 unsigned long long level, level_old;
820 union acpi_object *o;
821 struct acpi_video_device_brightness *br = NULL;
822 int result = -EINVAL;
823 u32 value;
824
825 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
826 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
827 "LCD brightness level\n"));
828 goto out;
829 }
830
831 if (obj->package.count < 2)
832 goto out;
833
834 br = kzalloc(sizeof(*br), GFP_KERNEL);
835 if (!br) {
836 printk(KERN_ERR "can't allocate memory\n");
837 result = -ENOMEM;
838 goto out;
839 }
840
841 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
842 GFP_KERNEL);
843 if (!br->levels) {
844 result = -ENOMEM;
845 goto out_free;
846 }
847
848 for (i = 0; i < obj->package.count; i++) {
849 o = (union acpi_object *)&obj->package.elements[i];
850 if (o->type != ACPI_TYPE_INTEGER) {
851 printk(KERN_ERR PREFIX "Invalid data\n");
852 continue;
853 }
854 value = (u32) o->integer.value;
855 /* Skip duplicate entries */
856 if (count > 2 && br->levels[count - 1] == value)
857 continue;
858
859 br->levels[count] = value;
860
861 if (br->levels[count] > max_level)
862 max_level = br->levels[count];
863 count++;
864 }
865
866 /*
867 * some buggy BIOS don't export the levels
868 * when machine is on AC/Battery in _BCL package.
869 * In this case, the first two elements in _BCL packages
870 * are also supported brightness levels that OS should take care of.
871 */
872 for (i = 2; i < count; i++) {
873 if (br->levels[i] == br->levels[0])
874 level_ac_battery++;
875 if (br->levels[i] == br->levels[1])
876 level_ac_battery++;
877 }
878
879 if (level_ac_battery < 2) {
880 level_ac_battery = 2 - level_ac_battery;
881 br->flags._BCL_no_ac_battery_levels = 1;
882 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
883 br->levels[i] = br->levels[i - level_ac_battery];
884 count += level_ac_battery;
885 } else if (level_ac_battery > 2)
886 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
887
888 /* Check if the _BCL package is in a reversed order */
889 if (max_level == br->levels[2]) {
890 br->flags._BCL_reversed = 1;
891 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
892 acpi_video_cmp_level, NULL);
893 } else if (max_level != br->levels[count - 1])
894 ACPI_ERROR((AE_INFO,
895 "Found unordered _BCL package"));
896
897 br->count = count;
898 device->brightness = br;
899
900 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
901 br->curr = level = max_level;
902
903 if (!device->cap._BQC)
904 goto set_level;
905
906 result = acpi_video_device_lcd_get_level_current(device,
907 &level_old, true);
908 if (result)
909 goto out_free_levels;
910
911 result = acpi_video_bqc_quirk(device, max_level, level_old);
912 if (result)
913 goto out_free_levels;
914 /*
915 * cap._BQC may get cleared due to _BQC is found to be broken
916 * in acpi_video_bqc_quirk, so check again here.
917 */
918 if (!device->cap._BQC)
919 goto set_level;
920
921 level = acpi_video_bqc_value_to_level(device, level_old);
922 /*
923 * On some buggy laptops, _BQC returns an uninitialized
924 * value when invoked for the first time, i.e.
925 * level_old is invalid (no matter whether it's a level
926 * or an index). Set the backlight to max_level in this case.
927 */
928 for (i = 2; i < br->count; i++)
929 if (level == br->levels[i])
930 break;
931 if (i == br->count || !level)
932 level = max_level;
933
934 set_level:
935 result = acpi_video_device_lcd_set_level(device, level);
936 if (result)
937 goto out_free_levels;
938
939 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
940 "found %d brightness levels\n", count - 2));
941 kfree(obj);
942 return result;
943
944 out_free_levels:
945 kfree(br->levels);
946 out_free:
947 kfree(br);
948 out:
949 device->brightness = NULL;
950 kfree(obj);
951 return result;
952 }
953
954 /*
955 * Arg:
956 * device : video output device (LCD, CRT, ..)
957 *
958 * Return Value:
959 * None
960 *
961 * Find out all required AML methods defined under the output
962 * device.
963 */
964
965 static void acpi_video_device_find_cap(struct acpi_video_device *device)
966 {
967 if (acpi_has_method(device->dev->handle, "_ADR"))
968 device->cap._ADR = 1;
969 if (acpi_has_method(device->dev->handle, "_BCL"))
970 device->cap._BCL = 1;
971 if (acpi_has_method(device->dev->handle, "_BCM"))
972 device->cap._BCM = 1;
973 if (acpi_has_method(device->dev->handle, "_BQC")) {
974 device->cap._BQC = 1;
975 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
976 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
977 device->cap._BCQ = 1;
978 }
979
980 if (acpi_has_method(device->dev->handle, "_DDC"))
981 device->cap._DDC = 1;
982 }
983
984 /*
985 * Arg:
986 * device : video output device (VGA)
987 *
988 * Return Value:
989 * None
990 *
991 * Find out all required AML methods defined under the video bus device.
992 */
993
994 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
995 {
996 if (acpi_has_method(video->device->handle, "_DOS"))
997 video->cap._DOS = 1;
998 if (acpi_has_method(video->device->handle, "_DOD"))
999 video->cap._DOD = 1;
1000 if (acpi_has_method(video->device->handle, "_ROM"))
1001 video->cap._ROM = 1;
1002 if (acpi_has_method(video->device->handle, "_GPD"))
1003 video->cap._GPD = 1;
1004 if (acpi_has_method(video->device->handle, "_SPD"))
1005 video->cap._SPD = 1;
1006 if (acpi_has_method(video->device->handle, "_VPO"))
1007 video->cap._VPO = 1;
1008 }
1009
1010 /*
1011 * Check whether the video bus device has required AML method to
1012 * support the desired features
1013 */
1014
1015 static int acpi_video_bus_check(struct acpi_video_bus *video)
1016 {
1017 acpi_status status = -ENOENT;
1018 struct pci_dev *dev;
1019
1020 if (!video)
1021 return -EINVAL;
1022
1023 dev = acpi_get_pci_dev(video->device->handle);
1024 if (!dev)
1025 return -ENODEV;
1026 pci_dev_put(dev);
1027
1028 /*
1029 * Since there is no HID, CID and so on for VGA driver, we have
1030 * to check well known required nodes.
1031 */
1032
1033 /* Does this device support video switching? */
1034 if (video->cap._DOS || video->cap._DOD) {
1035 if (!video->cap._DOS) {
1036 printk(KERN_WARNING FW_BUG
1037 "ACPI(%s) defines _DOD but not _DOS\n",
1038 acpi_device_bid(video->device));
1039 }
1040 video->flags.multihead = 1;
1041 status = 0;
1042 }
1043
1044 /* Does this device support retrieving a video ROM? */
1045 if (video->cap._ROM) {
1046 video->flags.rom = 1;
1047 status = 0;
1048 }
1049
1050 /* Does this device support configuring which video device to POST? */
1051 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1052 video->flags.post = 1;
1053 status = 0;
1054 }
1055
1056 return status;
1057 }
1058
1059 /*
1060 * --------------------------------------------------------------------------
1061 * Driver Interface
1062 * --------------------------------------------------------------------------
1063 */
1064
1065 /* device interface */
1066 static struct acpi_video_device_attrib *
1067 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1068 {
1069 struct acpi_video_enumerated_device *ids;
1070 int i;
1071
1072 for (i = 0; i < video->attached_count; i++) {
1073 ids = &video->attached_array[i];
1074 if ((ids->value.int_val & 0xffff) == device_id)
1075 return &ids->value.attrib;
1076 }
1077
1078 return NULL;
1079 }
1080
1081 static int
1082 acpi_video_get_device_type(struct acpi_video_bus *video,
1083 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.int_val;
1092 }
1093
1094 return 0;
1095 }
1096
1097 static int
1098 acpi_video_bus_get_one_device(struct acpi_device *device,
1099 struct acpi_video_bus *video)
1100 {
1101 unsigned long long device_id;
1102 int status, device_type;
1103 struct acpi_video_device *data;
1104 struct acpi_video_device_attrib *attribute;
1105
1106 status =
1107 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1108 /* Some device omits _ADR, we skip them instead of fail */
1109 if (ACPI_FAILURE(status))
1110 return 0;
1111
1112 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1113 if (!data)
1114 return -ENOMEM;
1115
1116 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1117 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1118 device->driver_data = data;
1119
1120 data->device_id = device_id;
1121 data->video = video;
1122 data->dev = device;
1123
1124 attribute = acpi_video_get_device_attr(video, device_id);
1125
1126 if (attribute && attribute->device_id_scheme) {
1127 switch (attribute->display_type) {
1128 case ACPI_VIDEO_DISPLAY_CRT:
1129 data->flags.crt = 1;
1130 break;
1131 case ACPI_VIDEO_DISPLAY_TV:
1132 data->flags.tvout = 1;
1133 break;
1134 case ACPI_VIDEO_DISPLAY_DVI:
1135 data->flags.dvi = 1;
1136 break;
1137 case ACPI_VIDEO_DISPLAY_LCD:
1138 data->flags.lcd = 1;
1139 break;
1140 default:
1141 data->flags.unknown = 1;
1142 break;
1143 }
1144 if (attribute->bios_can_detect)
1145 data->flags.bios = 1;
1146 } else {
1147 /* Check for legacy IDs */
1148 device_type = acpi_video_get_device_type(video, device_id);
1149 /* Ignore bits 16 and 18-20 */
1150 switch (device_type & 0xffe2ffff) {
1151 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1152 data->flags.crt = 1;
1153 break;
1154 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1155 data->flags.lcd = 1;
1156 break;
1157 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1158 data->flags.tvout = 1;
1159 break;
1160 default:
1161 data->flags.unknown = 1;
1162 }
1163 }
1164
1165 acpi_video_device_bind(video, data);
1166 acpi_video_device_find_cap(data);
1167
1168 mutex_lock(&video->device_list_lock);
1169 list_add_tail(&data->entry, &video->video_device_list);
1170 mutex_unlock(&video->device_list_lock);
1171
1172 return status;
1173 }
1174
1175 /*
1176 * Arg:
1177 * video : video bus device
1178 *
1179 * Return:
1180 * none
1181 *
1182 * Enumerate the video device list of the video bus,
1183 * bind the ids with the corresponding video devices
1184 * under the video bus.
1185 */
1186
1187 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1188 {
1189 struct acpi_video_device *dev;
1190
1191 mutex_lock(&video->device_list_lock);
1192
1193 list_for_each_entry(dev, &video->video_device_list, entry)
1194 acpi_video_device_bind(video, dev);
1195
1196 mutex_unlock(&video->device_list_lock);
1197 }
1198
1199 /*
1200 * Arg:
1201 * video : video bus device
1202 * device : video output device under the video
1203 * bus
1204 *
1205 * Return:
1206 * none
1207 *
1208 * Bind the ids with the corresponding video devices
1209 * under the video bus.
1210 */
1211
1212 static void
1213 acpi_video_device_bind(struct acpi_video_bus *video,
1214 struct acpi_video_device *device)
1215 {
1216 struct acpi_video_enumerated_device *ids;
1217 int i;
1218
1219 for (i = 0; i < video->attached_count; i++) {
1220 ids = &video->attached_array[i];
1221 if (device->device_id == (ids->value.int_val & 0xffff)) {
1222 ids->bind_info = device;
1223 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1224 }
1225 }
1226 }
1227
1228 /*
1229 * Arg:
1230 * video : video bus device
1231 *
1232 * Return:
1233 * < 0 : error
1234 *
1235 * Call _DOD to enumerate all devices attached to display adapter
1236 *
1237 */
1238
1239 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1240 {
1241 int status;
1242 int count;
1243 int i;
1244 struct acpi_video_enumerated_device *active_list;
1245 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1246 union acpi_object *dod = NULL;
1247 union acpi_object *obj;
1248
1249 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1250 if (!ACPI_SUCCESS(status)) {
1251 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1252 return status;
1253 }
1254
1255 dod = buffer.pointer;
1256 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1257 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1258 status = -EFAULT;
1259 goto out;
1260 }
1261
1262 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1263 dod->package.count));
1264
1265 active_list = kcalloc(1 + dod->package.count,
1266 sizeof(struct acpi_video_enumerated_device),
1267 GFP_KERNEL);
1268 if (!active_list) {
1269 status = -ENOMEM;
1270 goto out;
1271 }
1272
1273 count = 0;
1274 for (i = 0; i < dod->package.count; i++) {
1275 obj = &dod->package.elements[i];
1276
1277 if (obj->type != ACPI_TYPE_INTEGER) {
1278 printk(KERN_ERR PREFIX
1279 "Invalid _DOD data in element %d\n", i);
1280 continue;
1281 }
1282
1283 active_list[count].value.int_val = obj->integer.value;
1284 active_list[count].bind_info = NULL;
1285 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1286 (int)obj->integer.value));
1287 count++;
1288 }
1289
1290 kfree(video->attached_array);
1291
1292 video->attached_array = active_list;
1293 video->attached_count = count;
1294
1295 out:
1296 kfree(buffer.pointer);
1297 return status;
1298 }
1299
1300 static int
1301 acpi_video_get_next_level(struct acpi_video_device *device,
1302 u32 level_current, u32 event)
1303 {
1304 int min, max, min_above, max_below, i, l, delta = 255;
1305 max = max_below = 0;
1306 min = min_above = 255;
1307 /* Find closest level to level_current */
1308 for (i = 2; i < device->brightness->count; i++) {
1309 l = device->brightness->levels[i];
1310 if (abs(l - level_current) < abs(delta)) {
1311 delta = l - level_current;
1312 if (!delta)
1313 break;
1314 }
1315 }
1316 /* Ajust level_current to closest available level */
1317 level_current += delta;
1318 for (i = 2; i < device->brightness->count; i++) {
1319 l = device->brightness->levels[i];
1320 if (l < min)
1321 min = l;
1322 if (l > max)
1323 max = l;
1324 if (l < min_above && l > level_current)
1325 min_above = l;
1326 if (l > max_below && l < level_current)
1327 max_below = l;
1328 }
1329
1330 switch (event) {
1331 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1332 return (level_current < max) ? min_above : min;
1333 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1334 return (level_current < max) ? min_above : max;
1335 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1336 return (level_current > min) ? max_below : min;
1337 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1338 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1339 return 0;
1340 default:
1341 return level_current;
1342 }
1343 }
1344
1345 static int
1346 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1347 {
1348 unsigned long long level_current, level_next;
1349 int result = -EINVAL;
1350
1351 /* no warning message if acpi_backlight=vendor or a quirk is used */
1352 if (!acpi_video_verify_backlight_support())
1353 return 0;
1354
1355 if (!device->brightness)
1356 goto out;
1357
1358 result = acpi_video_device_lcd_get_level_current(device,
1359 &level_current,
1360 false);
1361 if (result)
1362 goto out;
1363
1364 level_next = acpi_video_get_next_level(device, level_current, event);
1365
1366 result = acpi_video_device_lcd_set_level(device, level_next);
1367
1368 if (!result)
1369 backlight_force_update(device->backlight,
1370 BACKLIGHT_UPDATE_HOTKEY);
1371
1372 out:
1373 if (result)
1374 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1375
1376 return result;
1377 }
1378
1379 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1380 void **edid)
1381 {
1382 struct acpi_video_bus *video;
1383 struct acpi_video_device *video_device;
1384 union acpi_object *buffer = NULL;
1385 acpi_status status;
1386 int i, length;
1387
1388 if (!device || !acpi_driver_data(device))
1389 return -EINVAL;
1390
1391 video = acpi_driver_data(device);
1392
1393 for (i = 0; i < video->attached_count; i++) {
1394 video_device = video->attached_array[i].bind_info;
1395 length = 256;
1396
1397 if (!video_device)
1398 continue;
1399
1400 if (!video_device->cap._DDC)
1401 continue;
1402
1403 if (type) {
1404 switch (type) {
1405 case ACPI_VIDEO_DISPLAY_CRT:
1406 if (!video_device->flags.crt)
1407 continue;
1408 break;
1409 case ACPI_VIDEO_DISPLAY_TV:
1410 if (!video_device->flags.tvout)
1411 continue;
1412 break;
1413 case ACPI_VIDEO_DISPLAY_DVI:
1414 if (!video_device->flags.dvi)
1415 continue;
1416 break;
1417 case ACPI_VIDEO_DISPLAY_LCD:
1418 if (!video_device->flags.lcd)
1419 continue;
1420 break;
1421 }
1422 } else if (video_device->device_id != device_id) {
1423 continue;
1424 }
1425
1426 status = acpi_video_device_EDID(video_device, &buffer, length);
1427
1428 if (ACPI_FAILURE(status) || !buffer ||
1429 buffer->type != ACPI_TYPE_BUFFER) {
1430 length = 128;
1431 status = acpi_video_device_EDID(video_device, &buffer,
1432 length);
1433 if (ACPI_FAILURE(status) || !buffer ||
1434 buffer->type != ACPI_TYPE_BUFFER) {
1435 continue;
1436 }
1437 }
1438
1439 *edid = buffer->buffer.pointer;
1440 return length;
1441 }
1442
1443 return -ENODEV;
1444 }
1445 EXPORT_SYMBOL(acpi_video_get_edid);
1446
1447 static int
1448 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1449 struct acpi_device *device)
1450 {
1451 int status = 0;
1452 struct acpi_device *dev;
1453
1454 /*
1455 * There are systems where video module known to work fine regardless
1456 * of broken _DOD and ignoring returned value here doesn't cause
1457 * any issues later.
1458 */
1459 acpi_video_device_enumerate(video);
1460
1461 list_for_each_entry(dev, &device->children, node) {
1462
1463 status = acpi_video_bus_get_one_device(dev, video);
1464 if (status) {
1465 dev_err(&dev->dev, "Can't attach device\n");
1466 break;
1467 }
1468 }
1469 return status;
1470 }
1471
1472 /* acpi_video interface */
1473
1474 /*
1475 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1476 * preform any automatic brightness change on receiving a notification.
1477 */
1478 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1479 {
1480 return acpi_video_bus_DOS(video, 0,
1481 acpi_osi_is_win8() ? 1 : 0);
1482 }
1483
1484 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1485 {
1486 return acpi_video_bus_DOS(video, 0,
1487 acpi_osi_is_win8() ? 0 : 1);
1488 }
1489
1490 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1491 {
1492 struct acpi_video_bus *video = acpi_driver_data(device);
1493 struct input_dev *input;
1494 int keycode = 0;
1495
1496 if (!video || !video->input)
1497 return;
1498
1499 input = video->input;
1500
1501 switch (event) {
1502 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1503 * most likely via hotkey. */
1504 keycode = KEY_SWITCHVIDEOMODE;
1505 break;
1506
1507 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1508 * connector. */
1509 acpi_video_device_enumerate(video);
1510 acpi_video_device_rebind(video);
1511 keycode = KEY_SWITCHVIDEOMODE;
1512 break;
1513
1514 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1515 keycode = KEY_SWITCHVIDEOMODE;
1516 break;
1517 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1518 keycode = KEY_VIDEO_NEXT;
1519 break;
1520 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1521 keycode = KEY_VIDEO_PREV;
1522 break;
1523
1524 default:
1525 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1526 "Unsupported event [0x%x]\n", event));
1527 break;
1528 }
1529
1530 if (acpi_notifier_call_chain(device, event, 0))
1531 /* Something vetoed the keypress. */
1532 keycode = 0;
1533
1534 if (keycode) {
1535 input_report_key(input, keycode, 1);
1536 input_sync(input);
1537 input_report_key(input, keycode, 0);
1538 input_sync(input);
1539 }
1540
1541 return;
1542 }
1543
1544 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1545 {
1546 struct acpi_video_device *video_device = data;
1547 struct acpi_device *device = NULL;
1548 struct acpi_video_bus *bus;
1549 struct input_dev *input;
1550 int keycode = 0;
1551
1552 if (!video_device)
1553 return;
1554
1555 device = video_device->dev;
1556 bus = video_device->video;
1557 input = bus->input;
1558
1559 switch (event) {
1560 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1561 if (brightness_switch_enabled)
1562 acpi_video_switch_brightness(video_device, event);
1563 keycode = KEY_BRIGHTNESS_CYCLE;
1564 break;
1565 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1566 if (brightness_switch_enabled)
1567 acpi_video_switch_brightness(video_device, event);
1568 keycode = KEY_BRIGHTNESSUP;
1569 break;
1570 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1571 if (brightness_switch_enabled)
1572 acpi_video_switch_brightness(video_device, event);
1573 keycode = KEY_BRIGHTNESSDOWN;
1574 break;
1575 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1576 if (brightness_switch_enabled)
1577 acpi_video_switch_brightness(video_device, event);
1578 keycode = KEY_BRIGHTNESS_ZERO;
1579 break;
1580 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1581 if (brightness_switch_enabled)
1582 acpi_video_switch_brightness(video_device, event);
1583 keycode = KEY_DISPLAY_OFF;
1584 break;
1585 default:
1586 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1587 "Unsupported event [0x%x]\n", event));
1588 break;
1589 }
1590
1591 acpi_notifier_call_chain(device, event, 0);
1592
1593 if (keycode) {
1594 input_report_key(input, keycode, 1);
1595 input_sync(input);
1596 input_report_key(input, keycode, 0);
1597 input_sync(input);
1598 }
1599
1600 return;
1601 }
1602
1603 static int acpi_video_resume(struct notifier_block *nb,
1604 unsigned long val, void *ign)
1605 {
1606 struct acpi_video_bus *video;
1607 struct acpi_video_device *video_device;
1608 int i;
1609
1610 switch (val) {
1611 case PM_HIBERNATION_PREPARE:
1612 case PM_SUSPEND_PREPARE:
1613 case PM_RESTORE_PREPARE:
1614 return NOTIFY_DONE;
1615 }
1616
1617 video = container_of(nb, struct acpi_video_bus, pm_nb);
1618
1619 dev_info(&video->device->dev, "Restoring backlight state\n");
1620
1621 for (i = 0; i < video->attached_count; i++) {
1622 video_device = video->attached_array[i].bind_info;
1623 if (video_device && video_device->backlight)
1624 acpi_video_set_brightness(video_device->backlight);
1625 }
1626
1627 return NOTIFY_OK;
1628 }
1629
1630 static acpi_status
1631 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1632 void **return_value)
1633 {
1634 struct acpi_device *device = context;
1635 struct acpi_device *sibling;
1636 int result;
1637
1638 if (handle == device->handle)
1639 return AE_CTRL_TERMINATE;
1640
1641 result = acpi_bus_get_device(handle, &sibling);
1642 if (result)
1643 return AE_OK;
1644
1645 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1646 return AE_ALREADY_EXISTS;
1647
1648 return AE_OK;
1649 }
1650
1651 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1652 {
1653 if (acpi_video_verify_backlight_support()) {
1654 struct backlight_properties props;
1655 struct pci_dev *pdev;
1656 acpi_handle acpi_parent;
1657 struct device *parent = NULL;
1658 int result;
1659 static int count;
1660 char *name;
1661
1662 result = acpi_video_init_brightness(device);
1663 if (result)
1664 return;
1665 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1666 if (!name)
1667 return;
1668 count++;
1669
1670 acpi_get_parent(device->dev->handle, &acpi_parent);
1671
1672 pdev = acpi_get_pci_dev(acpi_parent);
1673 if (pdev) {
1674 parent = &pdev->dev;
1675 pci_dev_put(pdev);
1676 }
1677
1678 memset(&props, 0, sizeof(struct backlight_properties));
1679 props.type = BACKLIGHT_FIRMWARE;
1680 props.max_brightness = device->brightness->count - 3;
1681 device->backlight = backlight_device_register(name,
1682 parent,
1683 device,
1684 &acpi_backlight_ops,
1685 &props);
1686 kfree(name);
1687 if (IS_ERR(device->backlight))
1688 return;
1689
1690 /*
1691 * Save current brightness level in case we have to restore it
1692 * before acpi_video_device_lcd_set_level() is called next time.
1693 */
1694 device->backlight->props.brightness =
1695 acpi_video_get_brightness(device->backlight);
1696
1697 device->cooling_dev = thermal_cooling_device_register("LCD",
1698 device->dev, &video_cooling_ops);
1699 if (IS_ERR(device->cooling_dev)) {
1700 /*
1701 * Set cooling_dev to NULL so we don't crash trying to
1702 * free it.
1703 * Also, why the hell we are returning early and
1704 * not attempt to register video output if cooling
1705 * device registration failed?
1706 * -- dtor
1707 */
1708 device->cooling_dev = NULL;
1709 return;
1710 }
1711
1712 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1713 device->cooling_dev->id);
1714 result = sysfs_create_link(&device->dev->dev.kobj,
1715 &device->cooling_dev->device.kobj,
1716 "thermal_cooling");
1717 if (result)
1718 printk(KERN_ERR PREFIX "Create sysfs link\n");
1719 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1720 &device->dev->dev.kobj, "device");
1721 if (result)
1722 printk(KERN_ERR PREFIX "Create sysfs link\n");
1723 }
1724 }
1725
1726 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1727 {
1728 struct acpi_video_device *dev;
1729
1730 mutex_lock(&video->device_list_lock);
1731 list_for_each_entry(dev, &video->video_device_list, entry)
1732 acpi_video_dev_register_backlight(dev);
1733 mutex_unlock(&video->device_list_lock);
1734
1735 video->pm_nb.notifier_call = acpi_video_resume;
1736 video->pm_nb.priority = 0;
1737 return register_pm_notifier(&video->pm_nb);
1738 }
1739
1740 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1741 {
1742 if (device->backlight) {
1743 backlight_device_unregister(device->backlight);
1744 device->backlight = NULL;
1745 }
1746 if (device->brightness) {
1747 kfree(device->brightness->levels);
1748 kfree(device->brightness);
1749 device->brightness = NULL;
1750 }
1751 if (device->cooling_dev) {
1752 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1753 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1754 thermal_cooling_device_unregister(device->cooling_dev);
1755 device->cooling_dev = NULL;
1756 }
1757 }
1758
1759 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1760 {
1761 struct acpi_video_device *dev;
1762 int error = unregister_pm_notifier(&video->pm_nb);
1763
1764 mutex_lock(&video->device_list_lock);
1765 list_for_each_entry(dev, &video->video_device_list, entry)
1766 acpi_video_dev_unregister_backlight(dev);
1767 mutex_unlock(&video->device_list_lock);
1768
1769 return error;
1770 }
1771
1772 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1773 {
1774 acpi_status status;
1775 struct acpi_device *adev = device->dev;
1776
1777 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1778 acpi_video_device_notify, device);
1779 if (ACPI_FAILURE(status))
1780 dev_err(&adev->dev, "Error installing notify handler\n");
1781 else
1782 device->flags.notify = 1;
1783 }
1784
1785 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1786 {
1787 struct input_dev *input;
1788 struct acpi_video_device *dev;
1789 int error;
1790
1791 video->input = input = input_allocate_device();
1792 if (!input) {
1793 error = -ENOMEM;
1794 goto out;
1795 }
1796
1797 error = acpi_video_bus_start_devices(video);
1798 if (error)
1799 goto err_free_input;
1800
1801 snprintf(video->phys, sizeof(video->phys),
1802 "%s/video/input0", acpi_device_hid(video->device));
1803
1804 input->name = acpi_device_name(video->device);
1805 input->phys = video->phys;
1806 input->id.bustype = BUS_HOST;
1807 input->id.product = 0x06;
1808 input->dev.parent = &video->device->dev;
1809 input->evbit[0] = BIT(EV_KEY);
1810 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1811 set_bit(KEY_VIDEO_NEXT, input->keybit);
1812 set_bit(KEY_VIDEO_PREV, input->keybit);
1813 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1814 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1815 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1816 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1817 set_bit(KEY_DISPLAY_OFF, input->keybit);
1818
1819 error = input_register_device(input);
1820 if (error)
1821 goto err_stop_dev;
1822
1823 mutex_lock(&video->device_list_lock);
1824 list_for_each_entry(dev, &video->video_device_list, entry)
1825 acpi_video_dev_add_notify_handler(dev);
1826 mutex_unlock(&video->device_list_lock);
1827
1828 return 0;
1829
1830 err_stop_dev:
1831 acpi_video_bus_stop_devices(video);
1832 err_free_input:
1833 input_free_device(input);
1834 video->input = NULL;
1835 out:
1836 return error;
1837 }
1838
1839 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1840 {
1841 if (dev->flags.notify) {
1842 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1843 acpi_video_device_notify);
1844 dev->flags.notify = 0;
1845 }
1846 }
1847
1848 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1849 {
1850 struct acpi_video_device *dev;
1851
1852 mutex_lock(&video->device_list_lock);
1853 list_for_each_entry(dev, &video->video_device_list, entry)
1854 acpi_video_dev_remove_notify_handler(dev);
1855 mutex_unlock(&video->device_list_lock);
1856
1857 acpi_video_bus_stop_devices(video);
1858 input_unregister_device(video->input);
1859 video->input = NULL;
1860 }
1861
1862 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1863 {
1864 struct acpi_video_device *dev, *next;
1865
1866 mutex_lock(&video->device_list_lock);
1867 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1868 list_del(&dev->entry);
1869 kfree(dev);
1870 }
1871 mutex_unlock(&video->device_list_lock);
1872
1873 return 0;
1874 }
1875
1876 static int instance;
1877
1878 static int acpi_video_bus_add(struct acpi_device *device)
1879 {
1880 struct acpi_video_bus *video;
1881 int error;
1882 acpi_status status;
1883
1884 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1885 device->parent->handle, 1,
1886 acpi_video_bus_match, NULL,
1887 device, NULL);
1888 if (status == AE_ALREADY_EXISTS) {
1889 printk(KERN_WARNING FW_BUG
1890 "Duplicate ACPI video bus devices for the"
1891 " same VGA controller, please try module "
1892 "parameter \"video.allow_duplicates=1\""
1893 "if the current driver doesn't work.\n");
1894 if (!allow_duplicates)
1895 return -ENODEV;
1896 }
1897
1898 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1899 if (!video)
1900 return -ENOMEM;
1901
1902 /* a hack to fix the duplicate name "VID" problem on T61 */
1903 if (!strcmp(device->pnp.bus_id, "VID")) {
1904 if (instance)
1905 device->pnp.bus_id[3] = '0' + instance;
1906 instance++;
1907 }
1908 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1909 if (!strcmp(device->pnp.bus_id, "VGA")) {
1910 if (instance)
1911 device->pnp.bus_id[3] = '0' + instance;
1912 instance++;
1913 }
1914
1915 video->device = device;
1916 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1917 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1918 device->driver_data = video;
1919
1920 acpi_video_bus_find_cap(video);
1921 error = acpi_video_bus_check(video);
1922 if (error)
1923 goto err_free_video;
1924
1925 mutex_init(&video->device_list_lock);
1926 INIT_LIST_HEAD(&video->video_device_list);
1927
1928 error = acpi_video_bus_get_devices(video, device);
1929 if (error)
1930 goto err_put_video;
1931
1932 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
1933 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1934 video->flags.multihead ? "yes" : "no",
1935 video->flags.rom ? "yes" : "no",
1936 video->flags.post ? "yes" : "no");
1937 mutex_lock(&video_list_lock);
1938 list_add_tail(&video->entry, &video_bus_head);
1939 mutex_unlock(&video_list_lock);
1940
1941 acpi_video_bus_register_backlight(video);
1942 acpi_video_bus_add_notify_handler(video);
1943
1944 return 0;
1945
1946 err_put_video:
1947 acpi_video_bus_put_devices(video);
1948 kfree(video->attached_array);
1949 err_free_video:
1950 kfree(video);
1951 device->driver_data = NULL;
1952
1953 return error;
1954 }
1955
1956 static int acpi_video_bus_remove(struct acpi_device *device)
1957 {
1958 struct acpi_video_bus *video = NULL;
1959
1960
1961 if (!device || !acpi_driver_data(device))
1962 return -EINVAL;
1963
1964 video = acpi_driver_data(device);
1965
1966 acpi_video_bus_remove_notify_handler(video);
1967 acpi_video_bus_unregister_backlight(video);
1968 acpi_video_bus_put_devices(video);
1969
1970 mutex_lock(&video_list_lock);
1971 list_del(&video->entry);
1972 mutex_unlock(&video_list_lock);
1973
1974 kfree(video->attached_array);
1975 kfree(video);
1976
1977 return 0;
1978 }
1979
1980 static int __init is_i740(struct pci_dev *dev)
1981 {
1982 if (dev->device == 0x00D1)
1983 return 1;
1984 if (dev->device == 0x7000)
1985 return 1;
1986 return 0;
1987 }
1988
1989 static int __init intel_opregion_present(void)
1990 {
1991 int opregion = 0;
1992 struct pci_dev *dev = NULL;
1993 u32 address;
1994
1995 for_each_pci_dev(dev) {
1996 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1997 continue;
1998 if (dev->vendor != PCI_VENDOR_ID_INTEL)
1999 continue;
2000 /* We don't want to poke around undefined i740 registers */
2001 if (is_i740(dev))
2002 continue;
2003 pci_read_config_dword(dev, 0xfc, &address);
2004 if (!address)
2005 continue;
2006 opregion = 1;
2007 }
2008 return opregion;
2009 }
2010
2011 int acpi_video_register(void)
2012 {
2013 int result = 0;
2014 if (register_count) {
2015 /*
2016 * if the function of acpi_video_register is already called,
2017 * don't register the acpi_vide_bus again and return no error.
2018 */
2019 return 0;
2020 }
2021
2022 mutex_init(&video_list_lock);
2023 INIT_LIST_HEAD(&video_bus_head);
2024
2025 result = acpi_bus_register_driver(&acpi_video_bus);
2026 if (result < 0)
2027 return -ENODEV;
2028
2029 /*
2030 * When the acpi_video_bus is loaded successfully, increase
2031 * the counter reference.
2032 */
2033 register_count = 1;
2034
2035 return 0;
2036 }
2037 EXPORT_SYMBOL(acpi_video_register);
2038
2039 void acpi_video_unregister(void)
2040 {
2041 if (!register_count) {
2042 /*
2043 * If the acpi video bus is already unloaded, don't
2044 * unload it again and return directly.
2045 */
2046 return;
2047 }
2048 acpi_bus_unregister_driver(&acpi_video_bus);
2049
2050 register_count = 0;
2051
2052 return;
2053 }
2054 EXPORT_SYMBOL(acpi_video_unregister);
2055
2056 /*
2057 * This is kind of nasty. Hardware using Intel chipsets may require
2058 * the video opregion code to be run first in order to initialise
2059 * state before any ACPI video calls are made. To handle this we defer
2060 * registration of the video class until the opregion code has run.
2061 */
2062
2063 static int __init acpi_video_init(void)
2064 {
2065 dmi_check_system(video_dmi_table);
2066
2067 if (intel_opregion_present())
2068 return 0;
2069
2070 return acpi_video_register();
2071 }
2072
2073 static void __exit acpi_video_exit(void)
2074 {
2075 acpi_video_unregister();
2076
2077 return;
2078 }
2079
2080 module_init(acpi_video_init);
2081 module_exit(acpi_video_exit);
Linux with added FPC-III support