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Merge tag 'pci-v3.15-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaa...
[deliverable/linux.git] / drivers / acpi / video.c
1 /*
2 * video.c - ACPI Video Driver
3 *
4 * Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
5 * Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
6 * Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
7 *
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or (at
13 * your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
23 *
24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25 */
26
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/types.h>
31 #include <linux/list.h>
32 #include <linux/mutex.h>
33 #include <linux/input.h>
34 #include <linux/backlight.h>
35 #include <linux/thermal.h>
36 #include <linux/sort.h>
37 #include <linux/pci.h>
38 #include <linux/pci_ids.h>
39 #include <linux/slab.h>
40 #include <linux/dmi.h>
41 #include <linux/suspend.h>
42 #include <linux/acpi.h>
43 #include <acpi/video.h>
44 #include <asm/uaccess.h>
45
46 #include "internal.h"
47
48 #define ACPI_VIDEO_BUS_NAME "Video Bus"
49 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
50 #define ACPI_VIDEO_NOTIFY_SWITCH 0x80
51 #define ACPI_VIDEO_NOTIFY_PROBE 0x81
52 #define ACPI_VIDEO_NOTIFY_CYCLE 0x82
53 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
54 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
55
56 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
57 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
58 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
59 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
60 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
61
62 #define MAX_NAME_LEN 20
63
64 #define _COMPONENT ACPI_VIDEO_COMPONENT
65 ACPI_MODULE_NAME("video");
66
67 MODULE_AUTHOR("Bruno Ducrot");
68 MODULE_DESCRIPTION("ACPI Video Driver");
69 MODULE_LICENSE("GPL");
70
71 static bool brightness_switch_enabled = 1;
72 module_param(brightness_switch_enabled, bool, 0644);
73
74 /*
75 * By default, we don't allow duplicate ACPI video bus devices
76 * under the same VGA controller
77 */
78 static bool allow_duplicates;
79 module_param(allow_duplicates, bool, 0644);
80
81 /*
82 * For Windows 8 systems: used to decide if video module
83 * should skip registering backlight interface of its own.
84 */
85 static int use_native_backlight_param = -1;
86 module_param_named(use_native_backlight, use_native_backlight_param, int, 0444);
87 static bool use_native_backlight_dmi = false;
88
89 static int register_count;
90 static struct mutex video_list_lock;
91 static struct list_head video_bus_head;
92 static int acpi_video_bus_add(struct acpi_device *device);
93 static int acpi_video_bus_remove(struct acpi_device *device);
94 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
95
96 static const struct acpi_device_id video_device_ids[] = {
97 {ACPI_VIDEO_HID, 0},
98 {"", 0},
99 };
100 MODULE_DEVICE_TABLE(acpi, video_device_ids);
101
102 static struct acpi_driver acpi_video_bus = {
103 .name = "video",
104 .class = ACPI_VIDEO_CLASS,
105 .ids = video_device_ids,
106 .ops = {
107 .add = acpi_video_bus_add,
108 .remove = acpi_video_bus_remove,
109 .notify = acpi_video_bus_notify,
110 },
111 };
112
113 struct acpi_video_bus_flags {
114 u8 multihead:1; /* can switch video heads */
115 u8 rom:1; /* can retrieve a video rom */
116 u8 post:1; /* can configure the head to */
117 u8 reserved:5;
118 };
119
120 struct acpi_video_bus_cap {
121 u8 _DOS:1; /* Enable/Disable output switching */
122 u8 _DOD:1; /* Enumerate all devices attached to display adapter */
123 u8 _ROM:1; /* Get ROM Data */
124 u8 _GPD:1; /* Get POST Device */
125 u8 _SPD:1; /* Set POST Device */
126 u8 _VPO:1; /* Video POST Options */
127 u8 reserved:2;
128 };
129
130 struct acpi_video_device_attrib {
131 u32 display_index:4; /* A zero-based instance of the Display */
132 u32 display_port_attachment:4; /* This field differentiates the display type */
133 u32 display_type:4; /* Describe the specific type in use */
134 u32 vendor_specific:4; /* Chipset Vendor Specific */
135 u32 bios_can_detect:1; /* BIOS can detect the device */
136 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to
137 the VGA device. */
138 u32 pipe_id:3; /* For VGA multiple-head devices. */
139 u32 reserved:10; /* Must be 0 */
140 u32 device_id_scheme:1; /* Device ID Scheme */
141 };
142
143 struct acpi_video_enumerated_device {
144 union {
145 u32 int_val;
146 struct acpi_video_device_attrib attrib;
147 } value;
148 struct acpi_video_device *bind_info;
149 };
150
151 struct acpi_video_bus {
152 struct acpi_device *device;
153 u8 dos_setting;
154 struct acpi_video_enumerated_device *attached_array;
155 u8 attached_count;
156 struct acpi_video_bus_cap cap;
157 struct acpi_video_bus_flags flags;
158 struct list_head video_device_list;
159 struct mutex device_list_lock; /* protects video_device_list */
160 struct list_head entry;
161 struct input_dev *input;
162 char phys[32]; /* for input device */
163 struct notifier_block pm_nb;
164 };
165
166 struct acpi_video_device_flags {
167 u8 crt:1;
168 u8 lcd:1;
169 u8 tvout:1;
170 u8 dvi:1;
171 u8 bios:1;
172 u8 unknown:1;
173 u8 notify:1;
174 u8 reserved:1;
175 };
176
177 struct acpi_video_device_cap {
178 u8 _ADR:1; /* Return the unique ID */
179 u8 _BCL:1; /* Query list of brightness control levels supported */
180 u8 _BCM:1; /* Set the brightness level */
181 u8 _BQC:1; /* Get current brightness level */
182 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
183 u8 _DDC:1; /* Return the EDID for this device */
184 };
185
186 struct acpi_video_brightness_flags {
187 u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
188 u8 _BCL_reversed:1; /* _BCL package is in a reversed order */
189 u8 _BQC_use_index:1; /* _BQC returns an index value */
190 };
191
192 struct acpi_video_device_brightness {
193 int curr;
194 int count;
195 int *levels;
196 struct acpi_video_brightness_flags flags;
197 };
198
199 struct acpi_video_device {
200 unsigned long device_id;
201 struct acpi_video_device_flags flags;
202 struct acpi_video_device_cap cap;
203 struct list_head entry;
204 struct acpi_video_bus *video;
205 struct acpi_device *dev;
206 struct acpi_video_device_brightness *brightness;
207 struct backlight_device *backlight;
208 struct thermal_cooling_device *cooling_dev;
209 };
210
211 static const char device_decode[][30] = {
212 "motherboard VGA device",
213 "PCI VGA device",
214 "AGP VGA device",
215 "UNKNOWN",
216 };
217
218 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
219 static void acpi_video_device_rebind(struct acpi_video_bus *video);
220 static void acpi_video_device_bind(struct acpi_video_bus *video,
221 struct acpi_video_device *device);
222 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
223 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
224 int level);
225 static int acpi_video_device_lcd_get_level_current(
226 struct acpi_video_device *device,
227 unsigned long long *level, bool raw);
228 static int acpi_video_get_next_level(struct acpi_video_device *device,
229 u32 level_current, u32 event);
230 static int acpi_video_switch_brightness(struct acpi_video_device *device,
231 int event);
232
233 static bool acpi_video_use_native_backlight(void)
234 {
235 if (use_native_backlight_param != -1)
236 return use_native_backlight_param;
237 else
238 return use_native_backlight_dmi;
239 }
240
241 static bool acpi_video_verify_backlight_support(void)
242 {
243 if (acpi_osi_is_win8() && acpi_video_use_native_backlight() &&
244 backlight_device_registered(BACKLIGHT_RAW))
245 return false;
246 return acpi_video_backlight_support();
247 }
248
249 /* backlight device sysfs support */
250 static int acpi_video_get_brightness(struct backlight_device *bd)
251 {
252 unsigned long long cur_level;
253 int i;
254 struct acpi_video_device *vd = bl_get_data(bd);
255
256 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
257 return -EINVAL;
258 for (i = 2; i < vd->brightness->count; i++) {
259 if (vd->brightness->levels[i] == cur_level)
260 /*
261 * The first two entries are special - see page 575
262 * of the ACPI spec 3.0
263 */
264 return i - 2;
265 }
266 return 0;
267 }
268
269 static int acpi_video_set_brightness(struct backlight_device *bd)
270 {
271 int request_level = bd->props.brightness + 2;
272 struct acpi_video_device *vd = bl_get_data(bd);
273
274 return acpi_video_device_lcd_set_level(vd,
275 vd->brightness->levels[request_level]);
276 }
277
278 static const struct backlight_ops acpi_backlight_ops = {
279 .get_brightness = acpi_video_get_brightness,
280 .update_status = acpi_video_set_brightness,
281 };
282
283 /* thermal cooling device callbacks */
284 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
285 long *state)
286 {
287 struct acpi_device *device = cooling_dev->devdata;
288 struct acpi_video_device *video = acpi_driver_data(device);
289
290 *state = video->brightness->count - 3;
291 return 0;
292 }
293
294 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
295 long *state)
296 {
297 struct acpi_device *device = cooling_dev->devdata;
298 struct acpi_video_device *video = acpi_driver_data(device);
299 unsigned long long level;
300 int offset;
301
302 if (acpi_video_device_lcd_get_level_current(video, &level, false))
303 return -EINVAL;
304 for (offset = 2; offset < video->brightness->count; offset++)
305 if (level == video->brightness->levels[offset]) {
306 *state = video->brightness->count - offset - 1;
307 return 0;
308 }
309
310 return -EINVAL;
311 }
312
313 static int
314 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
315 {
316 struct acpi_device *device = cooling_dev->devdata;
317 struct acpi_video_device *video = acpi_driver_data(device);
318 int level;
319
320 if (state >= video->brightness->count - 2)
321 return -EINVAL;
322
323 state = video->brightness->count - state;
324 level = video->brightness->levels[state - 1];
325 return acpi_video_device_lcd_set_level(video, level);
326 }
327
328 static const struct thermal_cooling_device_ops video_cooling_ops = {
329 .get_max_state = video_get_max_state,
330 .get_cur_state = video_get_cur_state,
331 .set_cur_state = video_set_cur_state,
332 };
333
334 /*
335 * --------------------------------------------------------------------------
336 * Video Management
337 * --------------------------------------------------------------------------
338 */
339
340 static int
341 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
342 union acpi_object **levels)
343 {
344 int status;
345 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
346 union acpi_object *obj;
347
348
349 *levels = NULL;
350
351 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
352 if (!ACPI_SUCCESS(status))
353 return status;
354 obj = (union acpi_object *)buffer.pointer;
355 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
356 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
357 status = -EFAULT;
358 goto err;
359 }
360
361 *levels = obj;
362
363 return 0;
364
365 err:
366 kfree(buffer.pointer);
367
368 return status;
369 }
370
371 static int
372 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
373 {
374 int status;
375 int state;
376
377 status = acpi_execute_simple_method(device->dev->handle,
378 "_BCM", level);
379 if (ACPI_FAILURE(status)) {
380 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
381 return -EIO;
382 }
383
384 device->brightness->curr = level;
385 for (state = 2; state < device->brightness->count; state++)
386 if (level == device->brightness->levels[state]) {
387 if (device->backlight)
388 device->backlight->props.brightness = state - 2;
389 return 0;
390 }
391
392 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
393 return -EINVAL;
394 }
395
396 /*
397 * For some buggy _BQC methods, we need to add a constant value to
398 * the _BQC return value to get the actual current brightness level
399 */
400
401 static int bqc_offset_aml_bug_workaround;
402 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
403 {
404 bqc_offset_aml_bug_workaround = 9;
405 return 0;
406 }
407
408 static int __init video_set_use_native_backlight(const struct dmi_system_id *d)
409 {
410 use_native_backlight_dmi = true;
411 return 0;
412 }
413
414 static struct dmi_system_id video_dmi_table[] __initdata = {
415 /*
416 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
417 */
418 {
419 .callback = video_set_bqc_offset,
420 .ident = "Acer Aspire 5720",
421 .matches = {
422 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
423 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
424 },
425 },
426 {
427 .callback = video_set_bqc_offset,
428 .ident = "Acer Aspire 5710Z",
429 .matches = {
430 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
431 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
432 },
433 },
434 {
435 .callback = video_set_bqc_offset,
436 .ident = "eMachines E510",
437 .matches = {
438 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
439 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
440 },
441 },
442 {
443 .callback = video_set_bqc_offset,
444 .ident = "Acer Aspire 5315",
445 .matches = {
446 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
447 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
448 },
449 },
450 {
451 .callback = video_set_bqc_offset,
452 .ident = "Acer Aspire 7720",
453 .matches = {
454 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
455 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
456 },
457 },
458 {
459 .callback = video_set_use_native_backlight,
460 .ident = "ThinkPad 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 = "Dell Inspiron 7520",
493 .matches = {
494 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
495 DMI_MATCH(DMI_PRODUCT_VERSION, "Inspiron 7520"),
496 },
497 },
498 {
499 .callback = video_set_use_native_backlight,
500 .ident = "Acer Aspire 5733Z",
501 .matches = {
502 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
503 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5733Z"),
504 },
505 },
506 {
507 .callback = video_set_use_native_backlight,
508 .ident = "Acer Aspire V5-431",
509 .matches = {
510 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
511 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-431"),
512 },
513 },
514 {
515 .callback = video_set_use_native_backlight,
516 .ident = "HP ProBook 4340s",
517 .matches = {
518 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
519 DMI_MATCH(DMI_PRODUCT_VERSION, "HP ProBook 4340s"),
520 },
521 },
522 {
523 .callback = video_set_use_native_backlight,
524 .ident = "HP ProBook 2013 models",
525 .matches = {
526 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
527 DMI_MATCH(DMI_PRODUCT_NAME, "HP ProBook "),
528 DMI_MATCH(DMI_PRODUCT_NAME, " G1"),
529 },
530 },
531 {
532 .callback = video_set_use_native_backlight,
533 .ident = "HP EliteBook 2013 models",
534 .matches = {
535 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
536 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook "),
537 DMI_MATCH(DMI_PRODUCT_NAME, " G1"),
538 },
539 },
540 {
541 .callback = video_set_use_native_backlight,
542 .ident = "HP ZBook 14",
543 .matches = {
544 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
545 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 14"),
546 },
547 },
548 {
549 .callback = video_set_use_native_backlight,
550 .ident = "HP ZBook 15",
551 .matches = {
552 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
553 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 15"),
554 },
555 },
556 {
557 .callback = video_set_use_native_backlight,
558 .ident = "HP ZBook 17",
559 .matches = {
560 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
561 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 17"),
562 },
563 },
564 {
565 .callback = video_set_use_native_backlight,
566 .ident = "HP EliteBook 8780w",
567 .matches = {
568 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
569 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8780w"),
570 },
571 },
572 {}
573 };
574
575 static unsigned long long
576 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
577 unsigned long long bqc_value)
578 {
579 unsigned long long level;
580
581 if (device->brightness->flags._BQC_use_index) {
582 /*
583 * _BQC returns an index that doesn't account for
584 * the first 2 items with special meaning, so we need
585 * to compensate for that by offsetting ourselves
586 */
587 if (device->brightness->flags._BCL_reversed)
588 bqc_value = device->brightness->count - 3 - bqc_value;
589
590 level = device->brightness->levels[bqc_value + 2];
591 } else {
592 level = bqc_value;
593 }
594
595 level += bqc_offset_aml_bug_workaround;
596
597 return level;
598 }
599
600 static int
601 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
602 unsigned long long *level, bool raw)
603 {
604 acpi_status status = AE_OK;
605 int i;
606
607 if (device->cap._BQC || device->cap._BCQ) {
608 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
609
610 status = acpi_evaluate_integer(device->dev->handle, buf,
611 NULL, level);
612 if (ACPI_SUCCESS(status)) {
613 if (raw) {
614 /*
615 * Caller has indicated he wants the raw
616 * value returned by _BQC, so don't furtherly
617 * mess with the value.
618 */
619 return 0;
620 }
621
622 *level = acpi_video_bqc_value_to_level(device, *level);
623
624 for (i = 2; i < device->brightness->count; i++)
625 if (device->brightness->levels[i] == *level) {
626 device->brightness->curr = *level;
627 return 0;
628 }
629 /*
630 * BQC returned an invalid level.
631 * Stop using it.
632 */
633 ACPI_WARNING((AE_INFO,
634 "%s returned an invalid level",
635 buf));
636 device->cap._BQC = device->cap._BCQ = 0;
637 } else {
638 /*
639 * Fixme:
640 * should we return an error or ignore this failure?
641 * dev->brightness->curr is a cached value which stores
642 * the correct current backlight level in most cases.
643 * ACPI video backlight still works w/ buggy _BQC.
644 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
645 */
646 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
647 device->cap._BQC = device->cap._BCQ = 0;
648 }
649 }
650
651 *level = device->brightness->curr;
652 return 0;
653 }
654
655 static int
656 acpi_video_device_EDID(struct acpi_video_device *device,
657 union acpi_object **edid, ssize_t length)
658 {
659 int status;
660 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
661 union acpi_object *obj;
662 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
663 struct acpi_object_list args = { 1, &arg0 };
664
665
666 *edid = NULL;
667
668 if (!device)
669 return -ENODEV;
670 if (length == 128)
671 arg0.integer.value = 1;
672 else if (length == 256)
673 arg0.integer.value = 2;
674 else
675 return -EINVAL;
676
677 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
678 if (ACPI_FAILURE(status))
679 return -ENODEV;
680
681 obj = buffer.pointer;
682
683 if (obj && obj->type == ACPI_TYPE_BUFFER)
684 *edid = obj;
685 else {
686 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
687 status = -EFAULT;
688 kfree(obj);
689 }
690
691 return status;
692 }
693
694 /* bus */
695
696 /*
697 * Arg:
698 * video : video bus device pointer
699 * bios_flag :
700 * 0. The system BIOS should NOT automatically switch(toggle)
701 * the active display output.
702 * 1. The system BIOS should automatically switch (toggle) the
703 * active display output. No switch event.
704 * 2. The _DGS value should be locked.
705 * 3. The system BIOS should not automatically switch (toggle) the
706 * active display output, but instead generate the display switch
707 * event notify code.
708 * lcd_flag :
709 * 0. The system BIOS should automatically control the brightness level
710 * of the LCD when the power changes from AC to DC
711 * 1. The system BIOS should NOT automatically control the brightness
712 * level of the LCD when the power changes from AC to DC.
713 * Return Value:
714 * -EINVAL wrong arg.
715 */
716
717 static int
718 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
719 {
720 acpi_status status;
721
722 if (!video->cap._DOS)
723 return 0;
724
725 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
726 return -EINVAL;
727 video->dos_setting = (lcd_flag << 2) | bios_flag;
728 status = acpi_execute_simple_method(video->device->handle, "_DOS",
729 (lcd_flag << 2) | bios_flag);
730 if (ACPI_FAILURE(status))
731 return -EIO;
732
733 return 0;
734 }
735
736 /*
737 * Simple comparison function used to sort backlight levels.
738 */
739
740 static int
741 acpi_video_cmp_level(const void *a, const void *b)
742 {
743 return *(int *)a - *(int *)b;
744 }
745
746 /*
747 * Decides if _BQC/_BCQ for this system is usable
748 *
749 * We do this by changing the level first and then read out the current
750 * brightness level, if the value does not match, find out if it is using
751 * index. If not, clear the _BQC/_BCQ capability.
752 */
753 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
754 int max_level, int current_level)
755 {
756 struct acpi_video_device_brightness *br = device->brightness;
757 int result;
758 unsigned long long level;
759 int test_level;
760
761 /* don't mess with existing known broken systems */
762 if (bqc_offset_aml_bug_workaround)
763 return 0;
764
765 /*
766 * Some systems always report current brightness level as maximum
767 * through _BQC, we need to test another value for them.
768 */
769 test_level = current_level == max_level ? br->levels[3] : max_level;
770
771 result = acpi_video_device_lcd_set_level(device, test_level);
772 if (result)
773 return result;
774
775 result = acpi_video_device_lcd_get_level_current(device, &level, true);
776 if (result)
777 return result;
778
779 if (level != test_level) {
780 /* buggy _BQC found, need to find out if it uses index */
781 if (level < br->count) {
782 if (br->flags._BCL_reversed)
783 level = br->count - 3 - level;
784 if (br->levels[level + 2] == test_level)
785 br->flags._BQC_use_index = 1;
786 }
787
788 if (!br->flags._BQC_use_index)
789 device->cap._BQC = device->cap._BCQ = 0;
790 }
791
792 return 0;
793 }
794
795
796 /*
797 * Arg:
798 * device : video output device (LCD, CRT, ..)
799 *
800 * Return Value:
801 * Maximum brightness level
802 *
803 * Allocate and initialize device->brightness.
804 */
805
806 static int
807 acpi_video_init_brightness(struct acpi_video_device *device)
808 {
809 union acpi_object *obj = NULL;
810 int i, max_level = 0, count = 0, level_ac_battery = 0;
811 unsigned long long level, level_old;
812 union acpi_object *o;
813 struct acpi_video_device_brightness *br = NULL;
814 int result = -EINVAL;
815 u32 value;
816
817 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
818 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
819 "LCD brightness level\n"));
820 goto out;
821 }
822
823 if (obj->package.count < 2)
824 goto out;
825
826 br = kzalloc(sizeof(*br), GFP_KERNEL);
827 if (!br) {
828 printk(KERN_ERR "can't allocate memory\n");
829 result = -ENOMEM;
830 goto out;
831 }
832
833 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
834 GFP_KERNEL);
835 if (!br->levels) {
836 result = -ENOMEM;
837 goto out_free;
838 }
839
840 for (i = 0; i < obj->package.count; i++) {
841 o = (union acpi_object *)&obj->package.elements[i];
842 if (o->type != ACPI_TYPE_INTEGER) {
843 printk(KERN_ERR PREFIX "Invalid data\n");
844 continue;
845 }
846 value = (u32) o->integer.value;
847 /* Skip duplicate entries */
848 if (count > 2 && br->levels[count - 1] == value)
849 continue;
850
851 br->levels[count] = value;
852
853 if (br->levels[count] > max_level)
854 max_level = br->levels[count];
855 count++;
856 }
857
858 /*
859 * some buggy BIOS don't export the levels
860 * when machine is on AC/Battery in _BCL package.
861 * In this case, the first two elements in _BCL packages
862 * are also supported brightness levels that OS should take care of.
863 */
864 for (i = 2; i < count; i++) {
865 if (br->levels[i] == br->levels[0])
866 level_ac_battery++;
867 if (br->levels[i] == br->levels[1])
868 level_ac_battery++;
869 }
870
871 if (level_ac_battery < 2) {
872 level_ac_battery = 2 - level_ac_battery;
873 br->flags._BCL_no_ac_battery_levels = 1;
874 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
875 br->levels[i] = br->levels[i - level_ac_battery];
876 count += level_ac_battery;
877 } else if (level_ac_battery > 2)
878 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
879
880 /* Check if the _BCL package is in a reversed order */
881 if (max_level == br->levels[2]) {
882 br->flags._BCL_reversed = 1;
883 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
884 acpi_video_cmp_level, NULL);
885 } else if (max_level != br->levels[count - 1])
886 ACPI_ERROR((AE_INFO,
887 "Found unordered _BCL package"));
888
889 br->count = count;
890 device->brightness = br;
891
892 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
893 br->curr = level = max_level;
894
895 if (!device->cap._BQC)
896 goto set_level;
897
898 result = acpi_video_device_lcd_get_level_current(device,
899 &level_old, true);
900 if (result)
901 goto out_free_levels;
902
903 result = acpi_video_bqc_quirk(device, max_level, level_old);
904 if (result)
905 goto out_free_levels;
906 /*
907 * cap._BQC may get cleared due to _BQC is found to be broken
908 * in acpi_video_bqc_quirk, so check again here.
909 */
910 if (!device->cap._BQC)
911 goto set_level;
912
913 level = acpi_video_bqc_value_to_level(device, level_old);
914 /*
915 * On some buggy laptops, _BQC returns an uninitialized
916 * value when invoked for the first time, i.e.
917 * level_old is invalid (no matter whether it's a level
918 * or an index). Set the backlight to max_level in this case.
919 */
920 for (i = 2; i < br->count; i++)
921 if (level == br->levels[i])
922 break;
923 if (i == br->count || !level)
924 level = max_level;
925
926 set_level:
927 result = acpi_video_device_lcd_set_level(device, level);
928 if (result)
929 goto out_free_levels;
930
931 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
932 "found %d brightness levels\n", count - 2));
933 kfree(obj);
934 return result;
935
936 out_free_levels:
937 kfree(br->levels);
938 out_free:
939 kfree(br);
940 out:
941 device->brightness = NULL;
942 kfree(obj);
943 return result;
944 }
945
946 /*
947 * Arg:
948 * device : video output device (LCD, CRT, ..)
949 *
950 * Return Value:
951 * None
952 *
953 * Find out all required AML methods defined under the output
954 * device.
955 */
956
957 static void acpi_video_device_find_cap(struct acpi_video_device *device)
958 {
959 if (acpi_has_method(device->dev->handle, "_ADR"))
960 device->cap._ADR = 1;
961 if (acpi_has_method(device->dev->handle, "_BCL"))
962 device->cap._BCL = 1;
963 if (acpi_has_method(device->dev->handle, "_BCM"))
964 device->cap._BCM = 1;
965 if (acpi_has_method(device->dev->handle, "_BQC")) {
966 device->cap._BQC = 1;
967 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
968 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
969 device->cap._BCQ = 1;
970 }
971
972 if (acpi_has_method(device->dev->handle, "_DDC"))
973 device->cap._DDC = 1;
974 }
975
976 /*
977 * Arg:
978 * device : video output device (VGA)
979 *
980 * Return Value:
981 * None
982 *
983 * Find out all required AML methods defined under the video bus device.
984 */
985
986 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
987 {
988 if (acpi_has_method(video->device->handle, "_DOS"))
989 video->cap._DOS = 1;
990 if (acpi_has_method(video->device->handle, "_DOD"))
991 video->cap._DOD = 1;
992 if (acpi_has_method(video->device->handle, "_ROM"))
993 video->cap._ROM = 1;
994 if (acpi_has_method(video->device->handle, "_GPD"))
995 video->cap._GPD = 1;
996 if (acpi_has_method(video->device->handle, "_SPD"))
997 video->cap._SPD = 1;
998 if (acpi_has_method(video->device->handle, "_VPO"))
999 video->cap._VPO = 1;
1000 }
1001
1002 /*
1003 * Check whether the video bus device has required AML method to
1004 * support the desired features
1005 */
1006
1007 static int acpi_video_bus_check(struct acpi_video_bus *video)
1008 {
1009 acpi_status status = -ENOENT;
1010 struct pci_dev *dev;
1011
1012 if (!video)
1013 return -EINVAL;
1014
1015 dev = acpi_get_pci_dev(video->device->handle);
1016 if (!dev)
1017 return -ENODEV;
1018 pci_dev_put(dev);
1019
1020 /*
1021 * Since there is no HID, CID and so on for VGA driver, we have
1022 * to check well known required nodes.
1023 */
1024
1025 /* Does this device support video switching? */
1026 if (video->cap._DOS || video->cap._DOD) {
1027 if (!video->cap._DOS) {
1028 printk(KERN_WARNING FW_BUG
1029 "ACPI(%s) defines _DOD but not _DOS\n",
1030 acpi_device_bid(video->device));
1031 }
1032 video->flags.multihead = 1;
1033 status = 0;
1034 }
1035
1036 /* Does this device support retrieving a video ROM? */
1037 if (video->cap._ROM) {
1038 video->flags.rom = 1;
1039 status = 0;
1040 }
1041
1042 /* Does this device support configuring which video device to POST? */
1043 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1044 video->flags.post = 1;
1045 status = 0;
1046 }
1047
1048 return status;
1049 }
1050
1051 /*
1052 * --------------------------------------------------------------------------
1053 * Driver Interface
1054 * --------------------------------------------------------------------------
1055 */
1056
1057 /* device interface */
1058 static struct acpi_video_device_attrib *
1059 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1060 {
1061 struct acpi_video_enumerated_device *ids;
1062 int i;
1063
1064 for (i = 0; i < video->attached_count; i++) {
1065 ids = &video->attached_array[i];
1066 if ((ids->value.int_val & 0xffff) == device_id)
1067 return &ids->value.attrib;
1068 }
1069
1070 return NULL;
1071 }
1072
1073 static int
1074 acpi_video_get_device_type(struct acpi_video_bus *video,
1075 unsigned long device_id)
1076 {
1077 struct acpi_video_enumerated_device *ids;
1078 int i;
1079
1080 for (i = 0; i < video->attached_count; i++) {
1081 ids = &video->attached_array[i];
1082 if ((ids->value.int_val & 0xffff) == device_id)
1083 return ids->value.int_val;
1084 }
1085
1086 return 0;
1087 }
1088
1089 static int
1090 acpi_video_bus_get_one_device(struct acpi_device *device,
1091 struct acpi_video_bus *video)
1092 {
1093 unsigned long long device_id;
1094 int status, device_type;
1095 struct acpi_video_device *data;
1096 struct acpi_video_device_attrib *attribute;
1097
1098 status =
1099 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1100 /* Some device omits _ADR, we skip them instead of fail */
1101 if (ACPI_FAILURE(status))
1102 return 0;
1103
1104 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1105 if (!data)
1106 return -ENOMEM;
1107
1108 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1109 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1110 device->driver_data = data;
1111
1112 data->device_id = device_id;
1113 data->video = video;
1114 data->dev = device;
1115
1116 attribute = acpi_video_get_device_attr(video, device_id);
1117
1118 if (attribute && attribute->device_id_scheme) {
1119 switch (attribute->display_type) {
1120 case ACPI_VIDEO_DISPLAY_CRT:
1121 data->flags.crt = 1;
1122 break;
1123 case ACPI_VIDEO_DISPLAY_TV:
1124 data->flags.tvout = 1;
1125 break;
1126 case ACPI_VIDEO_DISPLAY_DVI:
1127 data->flags.dvi = 1;
1128 break;
1129 case ACPI_VIDEO_DISPLAY_LCD:
1130 data->flags.lcd = 1;
1131 break;
1132 default:
1133 data->flags.unknown = 1;
1134 break;
1135 }
1136 if (attribute->bios_can_detect)
1137 data->flags.bios = 1;
1138 } else {
1139 /* Check for legacy IDs */
1140 device_type = acpi_video_get_device_type(video, device_id);
1141 /* Ignore bits 16 and 18-20 */
1142 switch (device_type & 0xffe2ffff) {
1143 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1144 data->flags.crt = 1;
1145 break;
1146 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1147 data->flags.lcd = 1;
1148 break;
1149 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1150 data->flags.tvout = 1;
1151 break;
1152 default:
1153 data->flags.unknown = 1;
1154 }
1155 }
1156
1157 acpi_video_device_bind(video, data);
1158 acpi_video_device_find_cap(data);
1159
1160 mutex_lock(&video->device_list_lock);
1161 list_add_tail(&data->entry, &video->video_device_list);
1162 mutex_unlock(&video->device_list_lock);
1163
1164 return status;
1165 }
1166
1167 /*
1168 * Arg:
1169 * video : video bus device
1170 *
1171 * Return:
1172 * none
1173 *
1174 * Enumerate the video device list of the video bus,
1175 * bind the ids with the corresponding video devices
1176 * under the video bus.
1177 */
1178
1179 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1180 {
1181 struct acpi_video_device *dev;
1182
1183 mutex_lock(&video->device_list_lock);
1184
1185 list_for_each_entry(dev, &video->video_device_list, entry)
1186 acpi_video_device_bind(video, dev);
1187
1188 mutex_unlock(&video->device_list_lock);
1189 }
1190
1191 /*
1192 * Arg:
1193 * video : video bus device
1194 * device : video output device under the video
1195 * bus
1196 *
1197 * Return:
1198 * none
1199 *
1200 * Bind the ids with the corresponding video devices
1201 * under the video bus.
1202 */
1203
1204 static void
1205 acpi_video_device_bind(struct acpi_video_bus *video,
1206 struct acpi_video_device *device)
1207 {
1208 struct acpi_video_enumerated_device *ids;
1209 int i;
1210
1211 for (i = 0; i < video->attached_count; i++) {
1212 ids = &video->attached_array[i];
1213 if (device->device_id == (ids->value.int_val & 0xffff)) {
1214 ids->bind_info = device;
1215 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1216 }
1217 }
1218 }
1219
1220 /*
1221 * Arg:
1222 * video : video bus device
1223 *
1224 * Return:
1225 * < 0 : error
1226 *
1227 * Call _DOD to enumerate all devices attached to display adapter
1228 *
1229 */
1230
1231 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1232 {
1233 int status;
1234 int count;
1235 int i;
1236 struct acpi_video_enumerated_device *active_list;
1237 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1238 union acpi_object *dod = NULL;
1239 union acpi_object *obj;
1240
1241 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1242 if (!ACPI_SUCCESS(status)) {
1243 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1244 return status;
1245 }
1246
1247 dod = buffer.pointer;
1248 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1249 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1250 status = -EFAULT;
1251 goto out;
1252 }
1253
1254 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1255 dod->package.count));
1256
1257 active_list = kcalloc(1 + dod->package.count,
1258 sizeof(struct acpi_video_enumerated_device),
1259 GFP_KERNEL);
1260 if (!active_list) {
1261 status = -ENOMEM;
1262 goto out;
1263 }
1264
1265 count = 0;
1266 for (i = 0; i < dod->package.count; i++) {
1267 obj = &dod->package.elements[i];
1268
1269 if (obj->type != ACPI_TYPE_INTEGER) {
1270 printk(KERN_ERR PREFIX
1271 "Invalid _DOD data in element %d\n", i);
1272 continue;
1273 }
1274
1275 active_list[count].value.int_val = obj->integer.value;
1276 active_list[count].bind_info = NULL;
1277 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1278 (int)obj->integer.value));
1279 count++;
1280 }
1281
1282 kfree(video->attached_array);
1283
1284 video->attached_array = active_list;
1285 video->attached_count = count;
1286
1287 out:
1288 kfree(buffer.pointer);
1289 return status;
1290 }
1291
1292 static int
1293 acpi_video_get_next_level(struct acpi_video_device *device,
1294 u32 level_current, u32 event)
1295 {
1296 int min, max, min_above, max_below, i, l, delta = 255;
1297 max = max_below = 0;
1298 min = min_above = 255;
1299 /* Find closest level to level_current */
1300 for (i = 2; i < device->brightness->count; i++) {
1301 l = device->brightness->levels[i];
1302 if (abs(l - level_current) < abs(delta)) {
1303 delta = l - level_current;
1304 if (!delta)
1305 break;
1306 }
1307 }
1308 /* Ajust level_current to closest available level */
1309 level_current += delta;
1310 for (i = 2; i < device->brightness->count; i++) {
1311 l = device->brightness->levels[i];
1312 if (l < min)
1313 min = l;
1314 if (l > max)
1315 max = l;
1316 if (l < min_above && l > level_current)
1317 min_above = l;
1318 if (l > max_below && l < level_current)
1319 max_below = l;
1320 }
1321
1322 switch (event) {
1323 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1324 return (level_current < max) ? min_above : min;
1325 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1326 return (level_current < max) ? min_above : max;
1327 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1328 return (level_current > min) ? max_below : min;
1329 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1330 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1331 return 0;
1332 default:
1333 return level_current;
1334 }
1335 }
1336
1337 static int
1338 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1339 {
1340 unsigned long long level_current, level_next;
1341 int result = -EINVAL;
1342
1343 /* no warning message if acpi_backlight=vendor or a quirk is used */
1344 if (!acpi_video_verify_backlight_support())
1345 return 0;
1346
1347 if (!device->brightness)
1348 goto out;
1349
1350 result = acpi_video_device_lcd_get_level_current(device,
1351 &level_current,
1352 false);
1353 if (result)
1354 goto out;
1355
1356 level_next = acpi_video_get_next_level(device, level_current, event);
1357
1358 result = acpi_video_device_lcd_set_level(device, level_next);
1359
1360 if (!result)
1361 backlight_force_update(device->backlight,
1362 BACKLIGHT_UPDATE_HOTKEY);
1363
1364 out:
1365 if (result)
1366 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1367
1368 return result;
1369 }
1370
1371 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1372 void **edid)
1373 {
1374 struct acpi_video_bus *video;
1375 struct acpi_video_device *video_device;
1376 union acpi_object *buffer = NULL;
1377 acpi_status status;
1378 int i, length;
1379
1380 if (!device || !acpi_driver_data(device))
1381 return -EINVAL;
1382
1383 video = acpi_driver_data(device);
1384
1385 for (i = 0; i < video->attached_count; i++) {
1386 video_device = video->attached_array[i].bind_info;
1387 length = 256;
1388
1389 if (!video_device)
1390 continue;
1391
1392 if (!video_device->cap._DDC)
1393 continue;
1394
1395 if (type) {
1396 switch (type) {
1397 case ACPI_VIDEO_DISPLAY_CRT:
1398 if (!video_device->flags.crt)
1399 continue;
1400 break;
1401 case ACPI_VIDEO_DISPLAY_TV:
1402 if (!video_device->flags.tvout)
1403 continue;
1404 break;
1405 case ACPI_VIDEO_DISPLAY_DVI:
1406 if (!video_device->flags.dvi)
1407 continue;
1408 break;
1409 case ACPI_VIDEO_DISPLAY_LCD:
1410 if (!video_device->flags.lcd)
1411 continue;
1412 break;
1413 }
1414 } else if (video_device->device_id != device_id) {
1415 continue;
1416 }
1417
1418 status = acpi_video_device_EDID(video_device, &buffer, length);
1419
1420 if (ACPI_FAILURE(status) || !buffer ||
1421 buffer->type != ACPI_TYPE_BUFFER) {
1422 length = 128;
1423 status = acpi_video_device_EDID(video_device, &buffer,
1424 length);
1425 if (ACPI_FAILURE(status) || !buffer ||
1426 buffer->type != ACPI_TYPE_BUFFER) {
1427 continue;
1428 }
1429 }
1430
1431 *edid = buffer->buffer.pointer;
1432 return length;
1433 }
1434
1435 return -ENODEV;
1436 }
1437 EXPORT_SYMBOL(acpi_video_get_edid);
1438
1439 static int
1440 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1441 struct acpi_device *device)
1442 {
1443 int status = 0;
1444 struct acpi_device *dev;
1445
1446 /*
1447 * There are systems where video module known to work fine regardless
1448 * of broken _DOD and ignoring returned value here doesn't cause
1449 * any issues later.
1450 */
1451 acpi_video_device_enumerate(video);
1452
1453 list_for_each_entry(dev, &device->children, node) {
1454
1455 status = acpi_video_bus_get_one_device(dev, video);
1456 if (status) {
1457 dev_err(&dev->dev, "Can't attach device\n");
1458 break;
1459 }
1460 }
1461 return status;
1462 }
1463
1464 /* acpi_video interface */
1465
1466 /*
1467 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1468 * preform any automatic brightness change on receiving a notification.
1469 */
1470 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1471 {
1472 return acpi_video_bus_DOS(video, 0,
1473 acpi_osi_is_win8() ? 1 : 0);
1474 }
1475
1476 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1477 {
1478 return acpi_video_bus_DOS(video, 0,
1479 acpi_osi_is_win8() ? 0 : 1);
1480 }
1481
1482 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1483 {
1484 struct acpi_video_bus *video = acpi_driver_data(device);
1485 struct input_dev *input;
1486 int keycode = 0;
1487
1488 if (!video || !video->input)
1489 return;
1490
1491 input = video->input;
1492
1493 switch (event) {
1494 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1495 * most likely via hotkey. */
1496 keycode = KEY_SWITCHVIDEOMODE;
1497 break;
1498
1499 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1500 * connector. */
1501 acpi_video_device_enumerate(video);
1502 acpi_video_device_rebind(video);
1503 keycode = KEY_SWITCHVIDEOMODE;
1504 break;
1505
1506 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1507 keycode = KEY_SWITCHVIDEOMODE;
1508 break;
1509 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1510 keycode = KEY_VIDEO_NEXT;
1511 break;
1512 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1513 keycode = KEY_VIDEO_PREV;
1514 break;
1515
1516 default:
1517 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1518 "Unsupported event [0x%x]\n", event));
1519 break;
1520 }
1521
1522 if (acpi_notifier_call_chain(device, event, 0))
1523 /* Something vetoed the keypress. */
1524 keycode = 0;
1525
1526 if (keycode) {
1527 input_report_key(input, keycode, 1);
1528 input_sync(input);
1529 input_report_key(input, keycode, 0);
1530 input_sync(input);
1531 }
1532
1533 return;
1534 }
1535
1536 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1537 {
1538 struct acpi_video_device *video_device = data;
1539 struct acpi_device *device = NULL;
1540 struct acpi_video_bus *bus;
1541 struct input_dev *input;
1542 int keycode = 0;
1543
1544 if (!video_device)
1545 return;
1546
1547 device = video_device->dev;
1548 bus = video_device->video;
1549 input = bus->input;
1550
1551 switch (event) {
1552 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1553 if (brightness_switch_enabled)
1554 acpi_video_switch_brightness(video_device, event);
1555 keycode = KEY_BRIGHTNESS_CYCLE;
1556 break;
1557 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1558 if (brightness_switch_enabled)
1559 acpi_video_switch_brightness(video_device, event);
1560 keycode = KEY_BRIGHTNESSUP;
1561 break;
1562 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1563 if (brightness_switch_enabled)
1564 acpi_video_switch_brightness(video_device, event);
1565 keycode = KEY_BRIGHTNESSDOWN;
1566 break;
1567 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1568 if (brightness_switch_enabled)
1569 acpi_video_switch_brightness(video_device, event);
1570 keycode = KEY_BRIGHTNESS_ZERO;
1571 break;
1572 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1573 if (brightness_switch_enabled)
1574 acpi_video_switch_brightness(video_device, event);
1575 keycode = KEY_DISPLAY_OFF;
1576 break;
1577 default:
1578 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1579 "Unsupported event [0x%x]\n", event));
1580 break;
1581 }
1582
1583 acpi_notifier_call_chain(device, event, 0);
1584
1585 if (keycode) {
1586 input_report_key(input, keycode, 1);
1587 input_sync(input);
1588 input_report_key(input, keycode, 0);
1589 input_sync(input);
1590 }
1591
1592 return;
1593 }
1594
1595 static int acpi_video_resume(struct notifier_block *nb,
1596 unsigned long val, void *ign)
1597 {
1598 struct acpi_video_bus *video;
1599 struct acpi_video_device *video_device;
1600 int i;
1601
1602 switch (val) {
1603 case PM_HIBERNATION_PREPARE:
1604 case PM_SUSPEND_PREPARE:
1605 case PM_RESTORE_PREPARE:
1606 return NOTIFY_DONE;
1607 }
1608
1609 video = container_of(nb, struct acpi_video_bus, pm_nb);
1610
1611 dev_info(&video->device->dev, "Restoring backlight state\n");
1612
1613 for (i = 0; i < video->attached_count; i++) {
1614 video_device = video->attached_array[i].bind_info;
1615 if (video_device && video_device->backlight)
1616 acpi_video_set_brightness(video_device->backlight);
1617 }
1618
1619 return NOTIFY_OK;
1620 }
1621
1622 static acpi_status
1623 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1624 void **return_value)
1625 {
1626 struct acpi_device *device = context;
1627 struct acpi_device *sibling;
1628 int result;
1629
1630 if (handle == device->handle)
1631 return AE_CTRL_TERMINATE;
1632
1633 result = acpi_bus_get_device(handle, &sibling);
1634 if (result)
1635 return AE_OK;
1636
1637 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1638 return AE_ALREADY_EXISTS;
1639
1640 return AE_OK;
1641 }
1642
1643 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1644 {
1645 if (acpi_video_verify_backlight_support()) {
1646 struct backlight_properties props;
1647 struct pci_dev *pdev;
1648 acpi_handle acpi_parent;
1649 struct device *parent = NULL;
1650 int result;
1651 static int count;
1652 char *name;
1653
1654 result = acpi_video_init_brightness(device);
1655 if (result)
1656 return;
1657 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1658 if (!name)
1659 return;
1660 count++;
1661
1662 acpi_get_parent(device->dev->handle, &acpi_parent);
1663
1664 pdev = acpi_get_pci_dev(acpi_parent);
1665 if (pdev) {
1666 parent = &pdev->dev;
1667 pci_dev_put(pdev);
1668 }
1669
1670 memset(&props, 0, sizeof(struct backlight_properties));
1671 props.type = BACKLIGHT_FIRMWARE;
1672 props.max_brightness = device->brightness->count - 3;
1673 device->backlight = backlight_device_register(name,
1674 parent,
1675 device,
1676 &acpi_backlight_ops,
1677 &props);
1678 kfree(name);
1679 if (IS_ERR(device->backlight))
1680 return;
1681
1682 /*
1683 * Save current brightness level in case we have to restore it
1684 * before acpi_video_device_lcd_set_level() is called next time.
1685 */
1686 device->backlight->props.brightness =
1687 acpi_video_get_brightness(device->backlight);
1688
1689 device->cooling_dev = thermal_cooling_device_register("LCD",
1690 device->dev, &video_cooling_ops);
1691 if (IS_ERR(device->cooling_dev)) {
1692 /*
1693 * Set cooling_dev to NULL so we don't crash trying to
1694 * free it.
1695 * Also, why the hell we are returning early and
1696 * not attempt to register video output if cooling
1697 * device registration failed?
1698 * -- dtor
1699 */
1700 device->cooling_dev = NULL;
1701 return;
1702 }
1703
1704 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1705 device->cooling_dev->id);
1706 result = sysfs_create_link(&device->dev->dev.kobj,
1707 &device->cooling_dev->device.kobj,
1708 "thermal_cooling");
1709 if (result)
1710 printk(KERN_ERR PREFIX "Create sysfs link\n");
1711 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1712 &device->dev->dev.kobj, "device");
1713 if (result)
1714 printk(KERN_ERR PREFIX "Create sysfs link\n");
1715 }
1716 }
1717
1718 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1719 {
1720 struct acpi_video_device *dev;
1721
1722 mutex_lock(&video->device_list_lock);
1723 list_for_each_entry(dev, &video->video_device_list, entry)
1724 acpi_video_dev_register_backlight(dev);
1725 mutex_unlock(&video->device_list_lock);
1726
1727 video->pm_nb.notifier_call = acpi_video_resume;
1728 video->pm_nb.priority = 0;
1729 return register_pm_notifier(&video->pm_nb);
1730 }
1731
1732 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1733 {
1734 if (device->backlight) {
1735 backlight_device_unregister(device->backlight);
1736 device->backlight = NULL;
1737 }
1738 if (device->brightness) {
1739 kfree(device->brightness->levels);
1740 kfree(device->brightness);
1741 device->brightness = NULL;
1742 }
1743 if (device->cooling_dev) {
1744 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1745 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1746 thermal_cooling_device_unregister(device->cooling_dev);
1747 device->cooling_dev = NULL;
1748 }
1749 }
1750
1751 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1752 {
1753 struct acpi_video_device *dev;
1754 int error = unregister_pm_notifier(&video->pm_nb);
1755
1756 mutex_lock(&video->device_list_lock);
1757 list_for_each_entry(dev, &video->video_device_list, entry)
1758 acpi_video_dev_unregister_backlight(dev);
1759 mutex_unlock(&video->device_list_lock);
1760
1761 return error;
1762 }
1763
1764 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1765 {
1766 acpi_status status;
1767 struct acpi_device *adev = device->dev;
1768
1769 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1770 acpi_video_device_notify, device);
1771 if (ACPI_FAILURE(status))
1772 dev_err(&adev->dev, "Error installing notify handler\n");
1773 else
1774 device->flags.notify = 1;
1775 }
1776
1777 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1778 {
1779 struct input_dev *input;
1780 struct acpi_video_device *dev;
1781 int error;
1782
1783 video->input = input = input_allocate_device();
1784 if (!input) {
1785 error = -ENOMEM;
1786 goto out;
1787 }
1788
1789 error = acpi_video_bus_start_devices(video);
1790 if (error)
1791 goto err_free_input;
1792
1793 snprintf(video->phys, sizeof(video->phys),
1794 "%s/video/input0", acpi_device_hid(video->device));
1795
1796 input->name = acpi_device_name(video->device);
1797 input->phys = video->phys;
1798 input->id.bustype = BUS_HOST;
1799 input->id.product = 0x06;
1800 input->dev.parent = &video->device->dev;
1801 input->evbit[0] = BIT(EV_KEY);
1802 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1803 set_bit(KEY_VIDEO_NEXT, input->keybit);
1804 set_bit(KEY_VIDEO_PREV, input->keybit);
1805 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1806 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1807 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1808 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1809 set_bit(KEY_DISPLAY_OFF, input->keybit);
1810
1811 error = input_register_device(input);
1812 if (error)
1813 goto err_stop_dev;
1814
1815 mutex_lock(&video->device_list_lock);
1816 list_for_each_entry(dev, &video->video_device_list, entry)
1817 acpi_video_dev_add_notify_handler(dev);
1818 mutex_unlock(&video->device_list_lock);
1819
1820 return 0;
1821
1822 err_stop_dev:
1823 acpi_video_bus_stop_devices(video);
1824 err_free_input:
1825 input_free_device(input);
1826 video->input = NULL;
1827 out:
1828 return error;
1829 }
1830
1831 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1832 {
1833 if (dev->flags.notify) {
1834 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1835 acpi_video_device_notify);
1836 dev->flags.notify = 0;
1837 }
1838 }
1839
1840 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1841 {
1842 struct acpi_video_device *dev;
1843
1844 mutex_lock(&video->device_list_lock);
1845 list_for_each_entry(dev, &video->video_device_list, entry)
1846 acpi_video_dev_remove_notify_handler(dev);
1847 mutex_unlock(&video->device_list_lock);
1848
1849 acpi_video_bus_stop_devices(video);
1850 input_unregister_device(video->input);
1851 video->input = NULL;
1852 }
1853
1854 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1855 {
1856 struct acpi_video_device *dev, *next;
1857
1858 mutex_lock(&video->device_list_lock);
1859 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1860 list_del(&dev->entry);
1861 kfree(dev);
1862 }
1863 mutex_unlock(&video->device_list_lock);
1864
1865 return 0;
1866 }
1867
1868 static int instance;
1869
1870 static int acpi_video_bus_add(struct acpi_device *device)
1871 {
1872 struct acpi_video_bus *video;
1873 int error;
1874 acpi_status status;
1875
1876 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1877 device->parent->handle, 1,
1878 acpi_video_bus_match, NULL,
1879 device, NULL);
1880 if (status == AE_ALREADY_EXISTS) {
1881 printk(KERN_WARNING FW_BUG
1882 "Duplicate ACPI video bus devices for the"
1883 " same VGA controller, please try module "
1884 "parameter \"video.allow_duplicates=1\""
1885 "if the current driver doesn't work.\n");
1886 if (!allow_duplicates)
1887 return -ENODEV;
1888 }
1889
1890 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1891 if (!video)
1892 return -ENOMEM;
1893
1894 /* a hack to fix the duplicate name "VID" problem on T61 */
1895 if (!strcmp(device->pnp.bus_id, "VID")) {
1896 if (instance)
1897 device->pnp.bus_id[3] = '0' + instance;
1898 instance++;
1899 }
1900 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1901 if (!strcmp(device->pnp.bus_id, "VGA")) {
1902 if (instance)
1903 device->pnp.bus_id[3] = '0' + instance;
1904 instance++;
1905 }
1906
1907 video->device = device;
1908 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1909 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1910 device->driver_data = video;
1911
1912 acpi_video_bus_find_cap(video);
1913 error = acpi_video_bus_check(video);
1914 if (error)
1915 goto err_free_video;
1916
1917 mutex_init(&video->device_list_lock);
1918 INIT_LIST_HEAD(&video->video_device_list);
1919
1920 error = acpi_video_bus_get_devices(video, device);
1921 if (error)
1922 goto err_put_video;
1923
1924 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
1925 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1926 video->flags.multihead ? "yes" : "no",
1927 video->flags.rom ? "yes" : "no",
1928 video->flags.post ? "yes" : "no");
1929 mutex_lock(&video_list_lock);
1930 list_add_tail(&video->entry, &video_bus_head);
1931 mutex_unlock(&video_list_lock);
1932
1933 acpi_video_bus_register_backlight(video);
1934 acpi_video_bus_add_notify_handler(video);
1935
1936 return 0;
1937
1938 err_put_video:
1939 acpi_video_bus_put_devices(video);
1940 kfree(video->attached_array);
1941 err_free_video:
1942 kfree(video);
1943 device->driver_data = NULL;
1944
1945 return error;
1946 }
1947
1948 static int acpi_video_bus_remove(struct acpi_device *device)
1949 {
1950 struct acpi_video_bus *video = NULL;
1951
1952
1953 if (!device || !acpi_driver_data(device))
1954 return -EINVAL;
1955
1956 video = acpi_driver_data(device);
1957
1958 acpi_video_bus_remove_notify_handler(video);
1959 acpi_video_bus_unregister_backlight(video);
1960 acpi_video_bus_put_devices(video);
1961
1962 mutex_lock(&video_list_lock);
1963 list_del(&video->entry);
1964 mutex_unlock(&video_list_lock);
1965
1966 kfree(video->attached_array);
1967 kfree(video);
1968
1969 return 0;
1970 }
1971
1972 static int __init is_i740(struct pci_dev *dev)
1973 {
1974 if (dev->device == 0x00D1)
1975 return 1;
1976 if (dev->device == 0x7000)
1977 return 1;
1978 return 0;
1979 }
1980
1981 static int __init intel_opregion_present(void)
1982 {
1983 int opregion = 0;
1984 struct pci_dev *dev = NULL;
1985 u32 address;
1986
1987 for_each_pci_dev(dev) {
1988 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1989 continue;
1990 if (dev->vendor != PCI_VENDOR_ID_INTEL)
1991 continue;
1992 /* We don't want to poke around undefined i740 registers */
1993 if (is_i740(dev))
1994 continue;
1995 pci_read_config_dword(dev, 0xfc, &address);
1996 if (!address)
1997 continue;
1998 opregion = 1;
1999 }
2000 return opregion;
2001 }
2002
2003 int acpi_video_register(void)
2004 {
2005 int result = 0;
2006 if (register_count) {
2007 /*
2008 * if the function of acpi_video_register is already called,
2009 * don't register the acpi_vide_bus again and return no error.
2010 */
2011 return 0;
2012 }
2013
2014 mutex_init(&video_list_lock);
2015 INIT_LIST_HEAD(&video_bus_head);
2016
2017 result = acpi_bus_register_driver(&acpi_video_bus);
2018 if (result < 0)
2019 return -ENODEV;
2020
2021 /*
2022 * When the acpi_video_bus is loaded successfully, increase
2023 * the counter reference.
2024 */
2025 register_count = 1;
2026
2027 return 0;
2028 }
2029 EXPORT_SYMBOL(acpi_video_register);
2030
2031 void acpi_video_unregister(void)
2032 {
2033 if (!register_count) {
2034 /*
2035 * If the acpi video bus is already unloaded, don't
2036 * unload it again and return directly.
2037 */
2038 return;
2039 }
2040 acpi_bus_unregister_driver(&acpi_video_bus);
2041
2042 register_count = 0;
2043
2044 return;
2045 }
2046 EXPORT_SYMBOL(acpi_video_unregister);
2047
2048 /*
2049 * This is kind of nasty. Hardware using Intel chipsets may require
2050 * the video opregion code to be run first in order to initialise
2051 * state before any ACPI video calls are made. To handle this we defer
2052 * registration of the video class until the opregion code has run.
2053 */
2054
2055 static int __init acpi_video_init(void)
2056 {
2057 dmi_check_system(video_dmi_table);
2058
2059 if (intel_opregion_present())
2060 return 0;
2061
2062 return acpi_video_register();
2063 }
2064
2065 static void __exit acpi_video_exit(void)
2066 {
2067 acpi_video_unregister();
2068
2069 return;
2070 }
2071
2072 module_init(acpi_video_init);
2073 module_exit(acpi_video_exit);
Linux kernel - Deliverables
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