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ACPI / video: clean up DMI table for initial black screen problem
[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 <asm/uaccess.h>
41 #include <linux/dmi.h>
42 #include <acpi/acpi_bus.h>
43 #include <acpi/acpi_drivers.h>
44 #include <linux/suspend.h>
45 #include <acpi/video.h>
46
47 #include "internal.h"
48
49 #define PREFIX "ACPI: "
50
51 #define ACPI_VIDEO_BUS_NAME "Video Bus"
52 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
53 #define ACPI_VIDEO_NOTIFY_SWITCH 0x80
54 #define ACPI_VIDEO_NOTIFY_PROBE 0x81
55 #define ACPI_VIDEO_NOTIFY_CYCLE 0x82
56 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
57 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
58
59 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
60 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
61 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
62 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
63 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
64
65 #define MAX_NAME_LEN 20
66
67 #define _COMPONENT ACPI_VIDEO_COMPONENT
68 ACPI_MODULE_NAME("video");
69
70 MODULE_AUTHOR("Bruno Ducrot");
71 MODULE_DESCRIPTION("ACPI Video Driver");
72 MODULE_LICENSE("GPL");
73
74 static bool brightness_switch_enabled = 1;
75 module_param(brightness_switch_enabled, bool, 0644);
76
77 /*
78 * By default, we don't allow duplicate ACPI video bus devices
79 * under the same VGA controller
80 */
81 static bool allow_duplicates;
82 module_param(allow_duplicates, bool, 0644);
83
84 /*
85 * For Windows 8 systems: if set ture and the GPU driver has
86 * registered a backlight interface, skip registering ACPI video's.
87 */
88 static bool use_native_backlight = false;
89 module_param(use_native_backlight, bool, 0644);
90
91 static int register_count;
92 static struct mutex video_list_lock;
93 static struct list_head video_bus_head;
94 static int acpi_video_bus_add(struct acpi_device *device);
95 static int acpi_video_bus_remove(struct acpi_device *device);
96 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
97
98 static const struct acpi_device_id video_device_ids[] = {
99 {ACPI_VIDEO_HID, 0},
100 {"", 0},
101 };
102 MODULE_DEVICE_TABLE(acpi, video_device_ids);
103
104 static struct acpi_driver acpi_video_bus = {
105 .name = "video",
106 .class = ACPI_VIDEO_CLASS,
107 .ids = video_device_ids,
108 .ops = {
109 .add = acpi_video_bus_add,
110 .remove = acpi_video_bus_remove,
111 .notify = acpi_video_bus_notify,
112 },
113 };
114
115 struct acpi_video_bus_flags {
116 u8 multihead:1; /* can switch video heads */
117 u8 rom:1; /* can retrieve a video rom */
118 u8 post:1; /* can configure the head to */
119 u8 reserved:5;
120 };
121
122 struct acpi_video_bus_cap {
123 u8 _DOS:1; /* Enable/Disable output switching */
124 u8 _DOD:1; /* Enumerate all devices attached to display adapter */
125 u8 _ROM:1; /* Get ROM Data */
126 u8 _GPD:1; /* Get POST Device */
127 u8 _SPD:1; /* Set POST Device */
128 u8 _VPO:1; /* Video POST Options */
129 u8 reserved:2;
130 };
131
132 struct acpi_video_device_attrib {
133 u32 display_index:4; /* A zero-based instance of the Display */
134 u32 display_port_attachment:4; /* This field differentiates the display type */
135 u32 display_type:4; /* Describe the specific type in use */
136 u32 vendor_specific:4; /* Chipset Vendor Specific */
137 u32 bios_can_detect:1; /* BIOS can detect the device */
138 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to
139 the VGA device. */
140 u32 pipe_id:3; /* For VGA multiple-head devices. */
141 u32 reserved:10; /* Must be 0 */
142 u32 device_id_scheme:1; /* Device ID Scheme */
143 };
144
145 struct acpi_video_enumerated_device {
146 union {
147 u32 int_val;
148 struct acpi_video_device_attrib attrib;
149 } value;
150 struct acpi_video_device *bind_info;
151 };
152
153 struct acpi_video_bus {
154 struct acpi_device *device;
155 u8 dos_setting;
156 struct acpi_video_enumerated_device *attached_array;
157 u8 attached_count;
158 struct acpi_video_bus_cap cap;
159 struct acpi_video_bus_flags flags;
160 struct list_head video_device_list;
161 struct mutex device_list_lock; /* protects video_device_list */
162 struct list_head entry;
163 struct input_dev *input;
164 char phys[32]; /* for input device */
165 struct notifier_block pm_nb;
166 };
167
168 struct acpi_video_device_flags {
169 u8 crt:1;
170 u8 lcd:1;
171 u8 tvout:1;
172 u8 dvi:1;
173 u8 bios:1;
174 u8 unknown:1;
175 u8 notify:1;
176 u8 reserved:1;
177 };
178
179 struct acpi_video_device_cap {
180 u8 _ADR:1; /* Return the unique ID */
181 u8 _BCL:1; /* Query list of brightness control levels supported */
182 u8 _BCM:1; /* Set the brightness level */
183 u8 _BQC:1; /* Get current brightness level */
184 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
185 u8 _DDC:1; /* Return the EDID for this device */
186 };
187
188 struct acpi_video_brightness_flags {
189 u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
190 u8 _BCL_reversed:1; /* _BCL package is in a reversed order */
191 u8 _BQC_use_index:1; /* _BQC returns an index value */
192 };
193
194 struct acpi_video_device_brightness {
195 int curr;
196 int count;
197 int *levels;
198 struct acpi_video_brightness_flags flags;
199 };
200
201 struct acpi_video_device {
202 unsigned long device_id;
203 struct acpi_video_device_flags flags;
204 struct acpi_video_device_cap cap;
205 struct list_head entry;
206 struct acpi_video_bus *video;
207 struct acpi_device *dev;
208 struct acpi_video_device_brightness *brightness;
209 struct backlight_device *backlight;
210 struct thermal_cooling_device *cooling_dev;
211 };
212
213 static const char device_decode[][30] = {
214 "motherboard VGA device",
215 "PCI VGA device",
216 "AGP VGA device",
217 "UNKNOWN",
218 };
219
220 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
221 static void acpi_video_device_rebind(struct acpi_video_bus *video);
222 static void acpi_video_device_bind(struct acpi_video_bus *video,
223 struct acpi_video_device *device);
224 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
225 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
226 int level);
227 static int acpi_video_device_lcd_get_level_current(
228 struct acpi_video_device *device,
229 unsigned long long *level, bool raw);
230 static int acpi_video_get_next_level(struct acpi_video_device *device,
231 u32 level_current, u32 event);
232 static int acpi_video_switch_brightness(struct acpi_video_device *device,
233 int event);
234
235 static bool acpi_video_verify_backlight_support(void)
236 {
237 if (acpi_osi_is_win8() && use_native_backlight &&
238 backlight_device_registered(BACKLIGHT_RAW))
239 return false;
240 return acpi_video_backlight_support();
241 }
242
243 /* backlight device sysfs support */
244 static int acpi_video_get_brightness(struct backlight_device *bd)
245 {
246 unsigned long long cur_level;
247 int i;
248 struct acpi_video_device *vd = bl_get_data(bd);
249
250 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
251 return -EINVAL;
252 for (i = 2; i < vd->brightness->count; i++) {
253 if (vd->brightness->levels[i] == cur_level)
254 /*
255 * The first two entries are special - see page 575
256 * of the ACPI spec 3.0
257 */
258 return i - 2;
259 }
260 return 0;
261 }
262
263 static int acpi_video_set_brightness(struct backlight_device *bd)
264 {
265 int request_level = bd->props.brightness + 2;
266 struct acpi_video_device *vd = bl_get_data(bd);
267
268 return acpi_video_device_lcd_set_level(vd,
269 vd->brightness->levels[request_level]);
270 }
271
272 static const struct backlight_ops acpi_backlight_ops = {
273 .get_brightness = acpi_video_get_brightness,
274 .update_status = acpi_video_set_brightness,
275 };
276
277 /* thermal cooling device callbacks */
278 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
279 long *state)
280 {
281 struct acpi_device *device = cooling_dev->devdata;
282 struct acpi_video_device *video = acpi_driver_data(device);
283
284 *state = video->brightness->count - 3;
285 return 0;
286 }
287
288 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
289 long *state)
290 {
291 struct acpi_device *device = cooling_dev->devdata;
292 struct acpi_video_device *video = acpi_driver_data(device);
293 unsigned long long level;
294 int offset;
295
296 if (acpi_video_device_lcd_get_level_current(video, &level, false))
297 return -EINVAL;
298 for (offset = 2; offset < video->brightness->count; offset++)
299 if (level == video->brightness->levels[offset]) {
300 *state = video->brightness->count - offset - 1;
301 return 0;
302 }
303
304 return -EINVAL;
305 }
306
307 static int
308 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
309 {
310 struct acpi_device *device = cooling_dev->devdata;
311 struct acpi_video_device *video = acpi_driver_data(device);
312 int level;
313
314 if (state >= video->brightness->count - 2)
315 return -EINVAL;
316
317 state = video->brightness->count - state;
318 level = video->brightness->levels[state - 1];
319 return acpi_video_device_lcd_set_level(video, level);
320 }
321
322 static const struct thermal_cooling_device_ops video_cooling_ops = {
323 .get_max_state = video_get_max_state,
324 .get_cur_state = video_get_cur_state,
325 .set_cur_state = video_set_cur_state,
326 };
327
328 /*
329 * --------------------------------------------------------------------------
330 * Video Management
331 * --------------------------------------------------------------------------
332 */
333
334 static int
335 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
336 union acpi_object **levels)
337 {
338 int status;
339 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
340 union acpi_object *obj;
341
342
343 *levels = NULL;
344
345 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
346 if (!ACPI_SUCCESS(status))
347 return status;
348 obj = (union acpi_object *)buffer.pointer;
349 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
350 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
351 status = -EFAULT;
352 goto err;
353 }
354
355 *levels = obj;
356
357 return 0;
358
359 err:
360 kfree(buffer.pointer);
361
362 return status;
363 }
364
365 static int
366 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
367 {
368 int status;
369 int state;
370
371 status = acpi_execute_simple_method(device->dev->handle,
372 "_BCM", level);
373 if (ACPI_FAILURE(status)) {
374 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
375 return -EIO;
376 }
377
378 device->brightness->curr = level;
379 for (state = 2; state < device->brightness->count; state++)
380 if (level == device->brightness->levels[state]) {
381 if (device->backlight)
382 device->backlight->props.brightness = state - 2;
383 return 0;
384 }
385
386 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
387 return -EINVAL;
388 }
389
390 /*
391 * For some buggy _BQC methods, we need to add a constant value to
392 * the _BQC return value to get the actual current brightness level
393 */
394
395 static int bqc_offset_aml_bug_workaround;
396 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
397 {
398 bqc_offset_aml_bug_workaround = 9;
399 return 0;
400 }
401
402 static struct dmi_system_id video_dmi_table[] __initdata = {
403 /*
404 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
405 */
406 {
407 .callback = video_set_bqc_offset,
408 .ident = "Acer Aspire 5720",
409 .matches = {
410 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
411 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
412 },
413 },
414 {
415 .callback = video_set_bqc_offset,
416 .ident = "Acer Aspire 5710Z",
417 .matches = {
418 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
419 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
420 },
421 },
422 {
423 .callback = video_set_bqc_offset,
424 .ident = "eMachines E510",
425 .matches = {
426 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
427 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
428 },
429 },
430 {
431 .callback = video_set_bqc_offset,
432 .ident = "Acer Aspire 5315",
433 .matches = {
434 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
435 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
436 },
437 },
438 {
439 .callback = video_set_bqc_offset,
440 .ident = "Acer Aspire 7720",
441 .matches = {
442 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
443 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
444 },
445 },
446 {}
447 };
448
449 static unsigned long long
450 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
451 unsigned long long bqc_value)
452 {
453 unsigned long long level;
454
455 if (device->brightness->flags._BQC_use_index) {
456 /*
457 * _BQC returns an index that doesn't account for
458 * the first 2 items with special meaning, so we need
459 * to compensate for that by offsetting ourselves
460 */
461 if (device->brightness->flags._BCL_reversed)
462 bqc_value = device->brightness->count - 3 - bqc_value;
463
464 level = device->brightness->levels[bqc_value + 2];
465 } else {
466 level = bqc_value;
467 }
468
469 level += bqc_offset_aml_bug_workaround;
470
471 return level;
472 }
473
474 static int
475 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
476 unsigned long long *level, bool raw)
477 {
478 acpi_status status = AE_OK;
479 int i;
480
481 if (device->cap._BQC || device->cap._BCQ) {
482 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
483
484 status = acpi_evaluate_integer(device->dev->handle, buf,
485 NULL, level);
486 if (ACPI_SUCCESS(status)) {
487 if (raw) {
488 /*
489 * Caller has indicated he wants the raw
490 * value returned by _BQC, so don't furtherly
491 * mess with the value.
492 */
493 return 0;
494 }
495
496 *level = acpi_video_bqc_value_to_level(device, *level);
497
498 for (i = 2; i < device->brightness->count; i++)
499 if (device->brightness->levels[i] == *level) {
500 device->brightness->curr = *level;
501 return 0;
502 }
503 /*
504 * BQC returned an invalid level.
505 * Stop using it.
506 */
507 ACPI_WARNING((AE_INFO,
508 "%s returned an invalid level",
509 buf));
510 device->cap._BQC = device->cap._BCQ = 0;
511 } else {
512 /*
513 * Fixme:
514 * should we return an error or ignore this failure?
515 * dev->brightness->curr is a cached value which stores
516 * the correct current backlight level in most cases.
517 * ACPI video backlight still works w/ buggy _BQC.
518 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
519 */
520 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
521 device->cap._BQC = device->cap._BCQ = 0;
522 }
523 }
524
525 *level = device->brightness->curr;
526 return 0;
527 }
528
529 static int
530 acpi_video_device_EDID(struct acpi_video_device *device,
531 union acpi_object **edid, ssize_t length)
532 {
533 int status;
534 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
535 union acpi_object *obj;
536 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
537 struct acpi_object_list args = { 1, &arg0 };
538
539
540 *edid = NULL;
541
542 if (!device)
543 return -ENODEV;
544 if (length == 128)
545 arg0.integer.value = 1;
546 else if (length == 256)
547 arg0.integer.value = 2;
548 else
549 return -EINVAL;
550
551 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
552 if (ACPI_FAILURE(status))
553 return -ENODEV;
554
555 obj = buffer.pointer;
556
557 if (obj && obj->type == ACPI_TYPE_BUFFER)
558 *edid = obj;
559 else {
560 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
561 status = -EFAULT;
562 kfree(obj);
563 }
564
565 return status;
566 }
567
568 /* bus */
569
570 /*
571 * Arg:
572 * video : video bus device pointer
573 * bios_flag :
574 * 0. The system BIOS should NOT automatically switch(toggle)
575 * the active display output.
576 * 1. The system BIOS should automatically switch (toggle) the
577 * active display output. No switch event.
578 * 2. The _DGS value should be locked.
579 * 3. The system BIOS should not automatically switch (toggle) the
580 * active display output, but instead generate the display switch
581 * event notify code.
582 * lcd_flag :
583 * 0. The system BIOS should automatically control the brightness level
584 * of the LCD when the power changes from AC to DC
585 * 1. The system BIOS should NOT automatically control the brightness
586 * level of the LCD when the power changes from AC to DC.
587 * Return Value:
588 * -EINVAL wrong arg.
589 */
590
591 static int
592 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
593 {
594 acpi_status status;
595
596 if (!video->cap._DOS)
597 return 0;
598
599 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
600 return -EINVAL;
601 video->dos_setting = (lcd_flag << 2) | bios_flag;
602 status = acpi_execute_simple_method(video->device->handle, "_DOS",
603 (lcd_flag << 2) | bios_flag);
604 if (ACPI_FAILURE(status))
605 return -EIO;
606
607 return 0;
608 }
609
610 /*
611 * Simple comparison function used to sort backlight levels.
612 */
613
614 static int
615 acpi_video_cmp_level(const void *a, const void *b)
616 {
617 return *(int *)a - *(int *)b;
618 }
619
620 /*
621 * Decides if _BQC/_BCQ for this system is usable
622 *
623 * We do this by changing the level first and then read out the current
624 * brightness level, if the value does not match, find out if it is using
625 * index. If not, clear the _BQC/_BCQ capability.
626 */
627 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
628 int max_level, int current_level)
629 {
630 struct acpi_video_device_brightness *br = device->brightness;
631 int result;
632 unsigned long long level;
633 int test_level;
634
635 /* don't mess with existing known broken systems */
636 if (bqc_offset_aml_bug_workaround)
637 return 0;
638
639 /*
640 * Some systems always report current brightness level as maximum
641 * through _BQC, we need to test another value for them.
642 */
643 test_level = current_level == max_level ? br->levels[3] : max_level;
644
645 result = acpi_video_device_lcd_set_level(device, test_level);
646 if (result)
647 return result;
648
649 result = acpi_video_device_lcd_get_level_current(device, &level, true);
650 if (result)
651 return result;
652
653 if (level != test_level) {
654 /* buggy _BQC found, need to find out if it uses index */
655 if (level < br->count) {
656 if (br->flags._BCL_reversed)
657 level = br->count - 3 - level;
658 if (br->levels[level + 2] == test_level)
659 br->flags._BQC_use_index = 1;
660 }
661
662 if (!br->flags._BQC_use_index)
663 device->cap._BQC = device->cap._BCQ = 0;
664 }
665
666 return 0;
667 }
668
669
670 /*
671 * Arg:
672 * device : video output device (LCD, CRT, ..)
673 *
674 * Return Value:
675 * Maximum brightness level
676 *
677 * Allocate and initialize device->brightness.
678 */
679
680 static int
681 acpi_video_init_brightness(struct acpi_video_device *device)
682 {
683 union acpi_object *obj = NULL;
684 int i, max_level = 0, count = 0, level_ac_battery = 0;
685 unsigned long long level, level_old;
686 union acpi_object *o;
687 struct acpi_video_device_brightness *br = NULL;
688 int result = -EINVAL;
689
690 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
691 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
692 "LCD brightness level\n"));
693 goto out;
694 }
695
696 if (obj->package.count < 2)
697 goto out;
698
699 br = kzalloc(sizeof(*br), GFP_KERNEL);
700 if (!br) {
701 printk(KERN_ERR "can't allocate memory\n");
702 result = -ENOMEM;
703 goto out;
704 }
705
706 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
707 GFP_KERNEL);
708 if (!br->levels) {
709 result = -ENOMEM;
710 goto out_free;
711 }
712
713 for (i = 0; i < obj->package.count; i++) {
714 o = (union acpi_object *)&obj->package.elements[i];
715 if (o->type != ACPI_TYPE_INTEGER) {
716 printk(KERN_ERR PREFIX "Invalid data\n");
717 continue;
718 }
719 br->levels[count] = (u32) o->integer.value;
720
721 if (br->levels[count] > max_level)
722 max_level = br->levels[count];
723 count++;
724 }
725
726 /*
727 * some buggy BIOS don't export the levels
728 * when machine is on AC/Battery in _BCL package.
729 * In this case, the first two elements in _BCL packages
730 * are also supported brightness levels that OS should take care of.
731 */
732 for (i = 2; i < count; i++) {
733 if (br->levels[i] == br->levels[0])
734 level_ac_battery++;
735 if (br->levels[i] == br->levels[1])
736 level_ac_battery++;
737 }
738
739 if (level_ac_battery < 2) {
740 level_ac_battery = 2 - level_ac_battery;
741 br->flags._BCL_no_ac_battery_levels = 1;
742 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
743 br->levels[i] = br->levels[i - level_ac_battery];
744 count += level_ac_battery;
745 } else if (level_ac_battery > 2)
746 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
747
748 /* Check if the _BCL package is in a reversed order */
749 if (max_level == br->levels[2]) {
750 br->flags._BCL_reversed = 1;
751 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
752 acpi_video_cmp_level, NULL);
753 } else if (max_level != br->levels[count - 1])
754 ACPI_ERROR((AE_INFO,
755 "Found unordered _BCL package"));
756
757 br->count = count;
758 device->brightness = br;
759
760 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
761 br->curr = level = max_level;
762
763 if (!device->cap._BQC)
764 goto set_level;
765
766 result = acpi_video_device_lcd_get_level_current(device,
767 &level_old, true);
768 if (result)
769 goto out_free_levels;
770
771 result = acpi_video_bqc_quirk(device, max_level, level_old);
772 if (result)
773 goto out_free_levels;
774 /*
775 * cap._BQC may get cleared due to _BQC is found to be broken
776 * in acpi_video_bqc_quirk, so check again here.
777 */
778 if (!device->cap._BQC)
779 goto set_level;
780
781 level = acpi_video_bqc_value_to_level(device, level_old);
782 /*
783 * On some buggy laptops, _BQC returns an uninitialized
784 * value when invoked for the first time, i.e.
785 * level_old is invalid (no matter whether it's a level
786 * or an index). Set the backlight to max_level in this case.
787 */
788 for (i = 2; i < br->count; i++)
789 if (level == br->levels[i])
790 break;
791 if (i == br->count || !level)
792 level = max_level;
793
794 set_level:
795 result = acpi_video_device_lcd_set_level(device, level);
796 if (result)
797 goto out_free_levels;
798
799 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
800 "found %d brightness levels\n", count - 2));
801 kfree(obj);
802 return result;
803
804 out_free_levels:
805 kfree(br->levels);
806 out_free:
807 kfree(br);
808 out:
809 device->brightness = NULL;
810 kfree(obj);
811 return result;
812 }
813
814 /*
815 * Arg:
816 * device : video output device (LCD, CRT, ..)
817 *
818 * Return Value:
819 * None
820 *
821 * Find out all required AML methods defined under the output
822 * device.
823 */
824
825 static void acpi_video_device_find_cap(struct acpi_video_device *device)
826 {
827 if (acpi_has_method(device->dev->handle, "_ADR"))
828 device->cap._ADR = 1;
829 if (acpi_has_method(device->dev->handle, "_BCL"))
830 device->cap._BCL = 1;
831 if (acpi_has_method(device->dev->handle, "_BCM"))
832 device->cap._BCM = 1;
833 if (acpi_has_method(device->dev->handle, "_BQC")) {
834 device->cap._BQC = 1;
835 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
836 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
837 device->cap._BCQ = 1;
838 }
839
840 if (acpi_has_method(device->dev->handle, "_DDC"))
841 device->cap._DDC = 1;
842 }
843
844 /*
845 * Arg:
846 * device : video output device (VGA)
847 *
848 * Return Value:
849 * None
850 *
851 * Find out all required AML methods defined under the video bus device.
852 */
853
854 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
855 {
856 if (acpi_has_method(video->device->handle, "_DOS"))
857 video->cap._DOS = 1;
858 if (acpi_has_method(video->device->handle, "_DOD"))
859 video->cap._DOD = 1;
860 if (acpi_has_method(video->device->handle, "_ROM"))
861 video->cap._ROM = 1;
862 if (acpi_has_method(video->device->handle, "_GPD"))
863 video->cap._GPD = 1;
864 if (acpi_has_method(video->device->handle, "_SPD"))
865 video->cap._SPD = 1;
866 if (acpi_has_method(video->device->handle, "_VPO"))
867 video->cap._VPO = 1;
868 }
869
870 /*
871 * Check whether the video bus device has required AML method to
872 * support the desired features
873 */
874
875 static int acpi_video_bus_check(struct acpi_video_bus *video)
876 {
877 acpi_status status = -ENOENT;
878 struct pci_dev *dev;
879
880 if (!video)
881 return -EINVAL;
882
883 dev = acpi_get_pci_dev(video->device->handle);
884 if (!dev)
885 return -ENODEV;
886 pci_dev_put(dev);
887
888 /*
889 * Since there is no HID, CID and so on for VGA driver, we have
890 * to check well known required nodes.
891 */
892
893 /* Does this device support video switching? */
894 if (video->cap._DOS || video->cap._DOD) {
895 if (!video->cap._DOS) {
896 printk(KERN_WARNING FW_BUG
897 "ACPI(%s) defines _DOD but not _DOS\n",
898 acpi_device_bid(video->device));
899 }
900 video->flags.multihead = 1;
901 status = 0;
902 }
903
904 /* Does this device support retrieving a video ROM? */
905 if (video->cap._ROM) {
906 video->flags.rom = 1;
907 status = 0;
908 }
909
910 /* Does this device support configuring which video device to POST? */
911 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
912 video->flags.post = 1;
913 status = 0;
914 }
915
916 return status;
917 }
918
919 /*
920 * --------------------------------------------------------------------------
921 * Driver Interface
922 * --------------------------------------------------------------------------
923 */
924
925 /* device interface */
926 static struct acpi_video_device_attrib *
927 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
928 {
929 struct acpi_video_enumerated_device *ids;
930 int i;
931
932 for (i = 0; i < video->attached_count; i++) {
933 ids = &video->attached_array[i];
934 if ((ids->value.int_val & 0xffff) == device_id)
935 return &ids->value.attrib;
936 }
937
938 return NULL;
939 }
940
941 static int
942 acpi_video_get_device_type(struct acpi_video_bus *video,
943 unsigned long device_id)
944 {
945 struct acpi_video_enumerated_device *ids;
946 int i;
947
948 for (i = 0; i < video->attached_count; i++) {
949 ids = &video->attached_array[i];
950 if ((ids->value.int_val & 0xffff) == device_id)
951 return ids->value.int_val;
952 }
953
954 return 0;
955 }
956
957 static int
958 acpi_video_bus_get_one_device(struct acpi_device *device,
959 struct acpi_video_bus *video)
960 {
961 unsigned long long device_id;
962 int status, device_type;
963 struct acpi_video_device *data;
964 struct acpi_video_device_attrib *attribute;
965
966 status =
967 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
968 /* Some device omits _ADR, we skip them instead of fail */
969 if (ACPI_FAILURE(status))
970 return 0;
971
972 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
973 if (!data)
974 return -ENOMEM;
975
976 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
977 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
978 device->driver_data = data;
979
980 data->device_id = device_id;
981 data->video = video;
982 data->dev = device;
983
984 attribute = acpi_video_get_device_attr(video, device_id);
985
986 if (attribute && attribute->device_id_scheme) {
987 switch (attribute->display_type) {
988 case ACPI_VIDEO_DISPLAY_CRT:
989 data->flags.crt = 1;
990 break;
991 case ACPI_VIDEO_DISPLAY_TV:
992 data->flags.tvout = 1;
993 break;
994 case ACPI_VIDEO_DISPLAY_DVI:
995 data->flags.dvi = 1;
996 break;
997 case ACPI_VIDEO_DISPLAY_LCD:
998 data->flags.lcd = 1;
999 break;
1000 default:
1001 data->flags.unknown = 1;
1002 break;
1003 }
1004 if (attribute->bios_can_detect)
1005 data->flags.bios = 1;
1006 } else {
1007 /* Check for legacy IDs */
1008 device_type = acpi_video_get_device_type(video, device_id);
1009 /* Ignore bits 16 and 18-20 */
1010 switch (device_type & 0xffe2ffff) {
1011 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1012 data->flags.crt = 1;
1013 break;
1014 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1015 data->flags.lcd = 1;
1016 break;
1017 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1018 data->flags.tvout = 1;
1019 break;
1020 default:
1021 data->flags.unknown = 1;
1022 }
1023 }
1024
1025 acpi_video_device_bind(video, data);
1026 acpi_video_device_find_cap(data);
1027
1028 mutex_lock(&video->device_list_lock);
1029 list_add_tail(&data->entry, &video->video_device_list);
1030 mutex_unlock(&video->device_list_lock);
1031
1032 return status;
1033 }
1034
1035 /*
1036 * Arg:
1037 * video : video bus device
1038 *
1039 * Return:
1040 * none
1041 *
1042 * Enumerate the video device list of the video bus,
1043 * bind the ids with the corresponding video devices
1044 * under the video bus.
1045 */
1046
1047 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1048 {
1049 struct acpi_video_device *dev;
1050
1051 mutex_lock(&video->device_list_lock);
1052
1053 list_for_each_entry(dev, &video->video_device_list, entry)
1054 acpi_video_device_bind(video, dev);
1055
1056 mutex_unlock(&video->device_list_lock);
1057 }
1058
1059 /*
1060 * Arg:
1061 * video : video bus device
1062 * device : video output device under the video
1063 * bus
1064 *
1065 * Return:
1066 * none
1067 *
1068 * Bind the ids with the corresponding video devices
1069 * under the video bus.
1070 */
1071
1072 static void
1073 acpi_video_device_bind(struct acpi_video_bus *video,
1074 struct acpi_video_device *device)
1075 {
1076 struct acpi_video_enumerated_device *ids;
1077 int i;
1078
1079 for (i = 0; i < video->attached_count; i++) {
1080 ids = &video->attached_array[i];
1081 if (device->device_id == (ids->value.int_val & 0xffff)) {
1082 ids->bind_info = device;
1083 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1084 }
1085 }
1086 }
1087
1088 /*
1089 * Arg:
1090 * video : video bus device
1091 *
1092 * Return:
1093 * < 0 : error
1094 *
1095 * Call _DOD to enumerate all devices attached to display adapter
1096 *
1097 */
1098
1099 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1100 {
1101 int status;
1102 int count;
1103 int i;
1104 struct acpi_video_enumerated_device *active_list;
1105 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1106 union acpi_object *dod = NULL;
1107 union acpi_object *obj;
1108
1109 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1110 if (!ACPI_SUCCESS(status)) {
1111 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1112 return status;
1113 }
1114
1115 dod = buffer.pointer;
1116 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1117 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1118 status = -EFAULT;
1119 goto out;
1120 }
1121
1122 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1123 dod->package.count));
1124
1125 active_list = kcalloc(1 + dod->package.count,
1126 sizeof(struct acpi_video_enumerated_device),
1127 GFP_KERNEL);
1128 if (!active_list) {
1129 status = -ENOMEM;
1130 goto out;
1131 }
1132
1133 count = 0;
1134 for (i = 0; i < dod->package.count; i++) {
1135 obj = &dod->package.elements[i];
1136
1137 if (obj->type != ACPI_TYPE_INTEGER) {
1138 printk(KERN_ERR PREFIX
1139 "Invalid _DOD data in element %d\n", i);
1140 continue;
1141 }
1142
1143 active_list[count].value.int_val = obj->integer.value;
1144 active_list[count].bind_info = NULL;
1145 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1146 (int)obj->integer.value));
1147 count++;
1148 }
1149
1150 kfree(video->attached_array);
1151
1152 video->attached_array = active_list;
1153 video->attached_count = count;
1154
1155 out:
1156 kfree(buffer.pointer);
1157 return status;
1158 }
1159
1160 static int
1161 acpi_video_get_next_level(struct acpi_video_device *device,
1162 u32 level_current, u32 event)
1163 {
1164 int min, max, min_above, max_below, i, l, delta = 255;
1165 max = max_below = 0;
1166 min = min_above = 255;
1167 /* Find closest level to level_current */
1168 for (i = 2; i < device->brightness->count; i++) {
1169 l = device->brightness->levels[i];
1170 if (abs(l - level_current) < abs(delta)) {
1171 delta = l - level_current;
1172 if (!delta)
1173 break;
1174 }
1175 }
1176 /* Ajust level_current to closest available level */
1177 level_current += delta;
1178 for (i = 2; i < device->brightness->count; i++) {
1179 l = device->brightness->levels[i];
1180 if (l < min)
1181 min = l;
1182 if (l > max)
1183 max = l;
1184 if (l < min_above && l > level_current)
1185 min_above = l;
1186 if (l > max_below && l < level_current)
1187 max_below = l;
1188 }
1189
1190 switch (event) {
1191 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1192 return (level_current < max) ? min_above : min;
1193 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1194 return (level_current < max) ? min_above : max;
1195 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1196 return (level_current > min) ? max_below : min;
1197 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1198 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1199 return 0;
1200 default:
1201 return level_current;
1202 }
1203 }
1204
1205 static int
1206 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1207 {
1208 unsigned long long level_current, level_next;
1209 int result = -EINVAL;
1210
1211 /* no warning message if acpi_backlight=vendor or a quirk is used */
1212 if (!acpi_video_verify_backlight_support())
1213 return 0;
1214
1215 if (!device->brightness)
1216 goto out;
1217
1218 result = acpi_video_device_lcd_get_level_current(device,
1219 &level_current,
1220 false);
1221 if (result)
1222 goto out;
1223
1224 level_next = acpi_video_get_next_level(device, level_current, event);
1225
1226 result = acpi_video_device_lcd_set_level(device, level_next);
1227
1228 if (!result)
1229 backlight_force_update(device->backlight,
1230 BACKLIGHT_UPDATE_HOTKEY);
1231
1232 out:
1233 if (result)
1234 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1235
1236 return result;
1237 }
1238
1239 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1240 void **edid)
1241 {
1242 struct acpi_video_bus *video;
1243 struct acpi_video_device *video_device;
1244 union acpi_object *buffer = NULL;
1245 acpi_status status;
1246 int i, length;
1247
1248 if (!device || !acpi_driver_data(device))
1249 return -EINVAL;
1250
1251 video = acpi_driver_data(device);
1252
1253 for (i = 0; i < video->attached_count; i++) {
1254 video_device = video->attached_array[i].bind_info;
1255 length = 256;
1256
1257 if (!video_device)
1258 continue;
1259
1260 if (!video_device->cap._DDC)
1261 continue;
1262
1263 if (type) {
1264 switch (type) {
1265 case ACPI_VIDEO_DISPLAY_CRT:
1266 if (!video_device->flags.crt)
1267 continue;
1268 break;
1269 case ACPI_VIDEO_DISPLAY_TV:
1270 if (!video_device->flags.tvout)
1271 continue;
1272 break;
1273 case ACPI_VIDEO_DISPLAY_DVI:
1274 if (!video_device->flags.dvi)
1275 continue;
1276 break;
1277 case ACPI_VIDEO_DISPLAY_LCD:
1278 if (!video_device->flags.lcd)
1279 continue;
1280 break;
1281 }
1282 } else if (video_device->device_id != device_id) {
1283 continue;
1284 }
1285
1286 status = acpi_video_device_EDID(video_device, &buffer, length);
1287
1288 if (ACPI_FAILURE(status) || !buffer ||
1289 buffer->type != ACPI_TYPE_BUFFER) {
1290 length = 128;
1291 status = acpi_video_device_EDID(video_device, &buffer,
1292 length);
1293 if (ACPI_FAILURE(status) || !buffer ||
1294 buffer->type != ACPI_TYPE_BUFFER) {
1295 continue;
1296 }
1297 }
1298
1299 *edid = buffer->buffer.pointer;
1300 return length;
1301 }
1302
1303 return -ENODEV;
1304 }
1305 EXPORT_SYMBOL(acpi_video_get_edid);
1306
1307 static int
1308 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1309 struct acpi_device *device)
1310 {
1311 int status = 0;
1312 struct acpi_device *dev;
1313
1314 /*
1315 * There are systems where video module known to work fine regardless
1316 * of broken _DOD and ignoring returned value here doesn't cause
1317 * any issues later.
1318 */
1319 acpi_video_device_enumerate(video);
1320
1321 list_for_each_entry(dev, &device->children, node) {
1322
1323 status = acpi_video_bus_get_one_device(dev, video);
1324 if (status) {
1325 dev_err(&dev->dev, "Can't attach device\n");
1326 break;
1327 }
1328 }
1329 return status;
1330 }
1331
1332 /* acpi_video interface */
1333
1334 /*
1335 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1336 * preform any automatic brightness change on receiving a notification.
1337 */
1338 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1339 {
1340 return acpi_video_bus_DOS(video, 0,
1341 acpi_osi_is_win8() ? 1 : 0);
1342 }
1343
1344 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1345 {
1346 return acpi_video_bus_DOS(video, 0,
1347 acpi_osi_is_win8() ? 0 : 1);
1348 }
1349
1350 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1351 {
1352 struct acpi_video_bus *video = acpi_driver_data(device);
1353 struct input_dev *input;
1354 int keycode = 0;
1355
1356 if (!video || !video->input)
1357 return;
1358
1359 input = video->input;
1360
1361 switch (event) {
1362 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1363 * most likely via hotkey. */
1364 keycode = KEY_SWITCHVIDEOMODE;
1365 break;
1366
1367 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1368 * connector. */
1369 acpi_video_device_enumerate(video);
1370 acpi_video_device_rebind(video);
1371 keycode = KEY_SWITCHVIDEOMODE;
1372 break;
1373
1374 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1375 keycode = KEY_SWITCHVIDEOMODE;
1376 break;
1377 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1378 keycode = KEY_VIDEO_NEXT;
1379 break;
1380 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1381 keycode = KEY_VIDEO_PREV;
1382 break;
1383
1384 default:
1385 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1386 "Unsupported event [0x%x]\n", event));
1387 break;
1388 }
1389
1390 if (acpi_notifier_call_chain(device, event, 0))
1391 /* Something vetoed the keypress. */
1392 keycode = 0;
1393
1394 if (keycode) {
1395 input_report_key(input, keycode, 1);
1396 input_sync(input);
1397 input_report_key(input, keycode, 0);
1398 input_sync(input);
1399 }
1400
1401 return;
1402 }
1403
1404 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1405 {
1406 struct acpi_video_device *video_device = data;
1407 struct acpi_device *device = NULL;
1408 struct acpi_video_bus *bus;
1409 struct input_dev *input;
1410 int keycode = 0;
1411
1412 if (!video_device)
1413 return;
1414
1415 device = video_device->dev;
1416 bus = video_device->video;
1417 input = bus->input;
1418
1419 switch (event) {
1420 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1421 if (brightness_switch_enabled)
1422 acpi_video_switch_brightness(video_device, event);
1423 keycode = KEY_BRIGHTNESS_CYCLE;
1424 break;
1425 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1426 if (brightness_switch_enabled)
1427 acpi_video_switch_brightness(video_device, event);
1428 keycode = KEY_BRIGHTNESSUP;
1429 break;
1430 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1431 if (brightness_switch_enabled)
1432 acpi_video_switch_brightness(video_device, event);
1433 keycode = KEY_BRIGHTNESSDOWN;
1434 break;
1435 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1436 if (brightness_switch_enabled)
1437 acpi_video_switch_brightness(video_device, event);
1438 keycode = KEY_BRIGHTNESS_ZERO;
1439 break;
1440 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1441 if (brightness_switch_enabled)
1442 acpi_video_switch_brightness(video_device, event);
1443 keycode = KEY_DISPLAY_OFF;
1444 break;
1445 default:
1446 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1447 "Unsupported event [0x%x]\n", event));
1448 break;
1449 }
1450
1451 acpi_notifier_call_chain(device, event, 0);
1452
1453 if (keycode) {
1454 input_report_key(input, keycode, 1);
1455 input_sync(input);
1456 input_report_key(input, keycode, 0);
1457 input_sync(input);
1458 }
1459
1460 return;
1461 }
1462
1463 static int acpi_video_resume(struct notifier_block *nb,
1464 unsigned long val, void *ign)
1465 {
1466 struct acpi_video_bus *video;
1467 struct acpi_video_device *video_device;
1468 int i;
1469
1470 switch (val) {
1471 case PM_HIBERNATION_PREPARE:
1472 case PM_SUSPEND_PREPARE:
1473 case PM_RESTORE_PREPARE:
1474 return NOTIFY_DONE;
1475 }
1476
1477 video = container_of(nb, struct acpi_video_bus, pm_nb);
1478
1479 dev_info(&video->device->dev, "Restoring backlight state\n");
1480
1481 for (i = 0; i < video->attached_count; i++) {
1482 video_device = video->attached_array[i].bind_info;
1483 if (video_device && video_device->backlight)
1484 acpi_video_set_brightness(video_device->backlight);
1485 }
1486
1487 return NOTIFY_OK;
1488 }
1489
1490 static acpi_status
1491 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1492 void **return_value)
1493 {
1494 struct acpi_device *device = context;
1495 struct acpi_device *sibling;
1496 int result;
1497
1498 if (handle == device->handle)
1499 return AE_CTRL_TERMINATE;
1500
1501 result = acpi_bus_get_device(handle, &sibling);
1502 if (result)
1503 return AE_OK;
1504
1505 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1506 return AE_ALREADY_EXISTS;
1507
1508 return AE_OK;
1509 }
1510
1511 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1512 {
1513 if (acpi_video_verify_backlight_support()) {
1514 struct backlight_properties props;
1515 struct pci_dev *pdev;
1516 acpi_handle acpi_parent;
1517 struct device *parent = NULL;
1518 int result;
1519 static int count;
1520 char *name;
1521
1522 result = acpi_video_init_brightness(device);
1523 if (result)
1524 return;
1525 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1526 if (!name)
1527 return;
1528 count++;
1529
1530 acpi_get_parent(device->dev->handle, &acpi_parent);
1531
1532 pdev = acpi_get_pci_dev(acpi_parent);
1533 if (pdev) {
1534 parent = &pdev->dev;
1535 pci_dev_put(pdev);
1536 }
1537
1538 memset(&props, 0, sizeof(struct backlight_properties));
1539 props.type = BACKLIGHT_FIRMWARE;
1540 props.max_brightness = device->brightness->count - 3;
1541 device->backlight = backlight_device_register(name,
1542 parent,
1543 device,
1544 &acpi_backlight_ops,
1545 &props);
1546 kfree(name);
1547 if (IS_ERR(device->backlight))
1548 return;
1549
1550 /*
1551 * Save current brightness level in case we have to restore it
1552 * before acpi_video_device_lcd_set_level() is called next time.
1553 */
1554 device->backlight->props.brightness =
1555 acpi_video_get_brightness(device->backlight);
1556
1557 device->cooling_dev = thermal_cooling_device_register("LCD",
1558 device->dev, &video_cooling_ops);
1559 if (IS_ERR(device->cooling_dev)) {
1560 /*
1561 * Set cooling_dev to NULL so we don't crash trying to
1562 * free it.
1563 * Also, why the hell we are returning early and
1564 * not attempt to register video output if cooling
1565 * device registration failed?
1566 * -- dtor
1567 */
1568 device->cooling_dev = NULL;
1569 return;
1570 }
1571
1572 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1573 device->cooling_dev->id);
1574 result = sysfs_create_link(&device->dev->dev.kobj,
1575 &device->cooling_dev->device.kobj,
1576 "thermal_cooling");
1577 if (result)
1578 printk(KERN_ERR PREFIX "Create sysfs link\n");
1579 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1580 &device->dev->dev.kobj, "device");
1581 if (result)
1582 printk(KERN_ERR PREFIX "Create sysfs link\n");
1583 }
1584 }
1585
1586 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1587 {
1588 struct acpi_video_device *dev;
1589
1590 mutex_lock(&video->device_list_lock);
1591 list_for_each_entry(dev, &video->video_device_list, entry)
1592 acpi_video_dev_register_backlight(dev);
1593 mutex_unlock(&video->device_list_lock);
1594
1595 video->pm_nb.notifier_call = acpi_video_resume;
1596 video->pm_nb.priority = 0;
1597 return register_pm_notifier(&video->pm_nb);
1598 }
1599
1600 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1601 {
1602 if (device->backlight) {
1603 backlight_device_unregister(device->backlight);
1604 device->backlight = NULL;
1605 }
1606 if (device->brightness) {
1607 kfree(device->brightness->levels);
1608 kfree(device->brightness);
1609 device->brightness = NULL;
1610 }
1611 if (device->cooling_dev) {
1612 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1613 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1614 thermal_cooling_device_unregister(device->cooling_dev);
1615 device->cooling_dev = NULL;
1616 }
1617 }
1618
1619 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1620 {
1621 struct acpi_video_device *dev;
1622 int error = unregister_pm_notifier(&video->pm_nb);
1623
1624 mutex_lock(&video->device_list_lock);
1625 list_for_each_entry(dev, &video->video_device_list, entry)
1626 acpi_video_dev_unregister_backlight(dev);
1627 mutex_unlock(&video->device_list_lock);
1628
1629 return error;
1630 }
1631
1632 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1633 {
1634 acpi_status status;
1635 struct acpi_device *adev = device->dev;
1636
1637 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1638 acpi_video_device_notify, device);
1639 if (ACPI_FAILURE(status))
1640 dev_err(&adev->dev, "Error installing notify handler\n");
1641 else
1642 device->flags.notify = 1;
1643 }
1644
1645 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1646 {
1647 struct input_dev *input;
1648 struct acpi_video_device *dev;
1649 int error;
1650
1651 video->input = input = input_allocate_device();
1652 if (!input) {
1653 error = -ENOMEM;
1654 goto out;
1655 }
1656
1657 error = acpi_video_bus_start_devices(video);
1658 if (error)
1659 goto err_free_input;
1660
1661 snprintf(video->phys, sizeof(video->phys),
1662 "%s/video/input0", acpi_device_hid(video->device));
1663
1664 input->name = acpi_device_name(video->device);
1665 input->phys = video->phys;
1666 input->id.bustype = BUS_HOST;
1667 input->id.product = 0x06;
1668 input->dev.parent = &video->device->dev;
1669 input->evbit[0] = BIT(EV_KEY);
1670 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1671 set_bit(KEY_VIDEO_NEXT, input->keybit);
1672 set_bit(KEY_VIDEO_PREV, input->keybit);
1673 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1674 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1675 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1676 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1677 set_bit(KEY_DISPLAY_OFF, input->keybit);
1678
1679 error = input_register_device(input);
1680 if (error)
1681 goto err_stop_dev;
1682
1683 mutex_lock(&video->device_list_lock);
1684 list_for_each_entry(dev, &video->video_device_list, entry)
1685 acpi_video_dev_add_notify_handler(dev);
1686 mutex_unlock(&video->device_list_lock);
1687
1688 return 0;
1689
1690 err_stop_dev:
1691 acpi_video_bus_stop_devices(video);
1692 err_free_input:
1693 input_free_device(input);
1694 video->input = NULL;
1695 out:
1696 return error;
1697 }
1698
1699 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1700 {
1701 if (dev->flags.notify) {
1702 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1703 acpi_video_device_notify);
1704 dev->flags.notify = 0;
1705 }
1706 }
1707
1708 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1709 {
1710 struct acpi_video_device *dev;
1711
1712 mutex_lock(&video->device_list_lock);
1713 list_for_each_entry(dev, &video->video_device_list, entry)
1714 acpi_video_dev_remove_notify_handler(dev);
1715 mutex_unlock(&video->device_list_lock);
1716
1717 acpi_video_bus_stop_devices(video);
1718 input_unregister_device(video->input);
1719 video->input = NULL;
1720 }
1721
1722 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1723 {
1724 struct acpi_video_device *dev, *next;
1725
1726 mutex_lock(&video->device_list_lock);
1727 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1728 list_del(&dev->entry);
1729 kfree(dev);
1730 }
1731 mutex_unlock(&video->device_list_lock);
1732
1733 return 0;
1734 }
1735
1736 static int instance;
1737
1738 static int acpi_video_bus_add(struct acpi_device *device)
1739 {
1740 struct acpi_video_bus *video;
1741 int error;
1742 acpi_status status;
1743
1744 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1745 device->parent->handle, 1,
1746 acpi_video_bus_match, NULL,
1747 device, NULL);
1748 if (status == AE_ALREADY_EXISTS) {
1749 printk(KERN_WARNING FW_BUG
1750 "Duplicate ACPI video bus devices for the"
1751 " same VGA controller, please try module "
1752 "parameter \"video.allow_duplicates=1\""
1753 "if the current driver doesn't work.\n");
1754 if (!allow_duplicates)
1755 return -ENODEV;
1756 }
1757
1758 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1759 if (!video)
1760 return -ENOMEM;
1761
1762 /* a hack to fix the duplicate name "VID" problem on T61 */
1763 if (!strcmp(device->pnp.bus_id, "VID")) {
1764 if (instance)
1765 device->pnp.bus_id[3] = '0' + instance;
1766 instance++;
1767 }
1768 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1769 if (!strcmp(device->pnp.bus_id, "VGA")) {
1770 if (instance)
1771 device->pnp.bus_id[3] = '0' + instance;
1772 instance++;
1773 }
1774
1775 video->device = device;
1776 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1777 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1778 device->driver_data = video;
1779
1780 acpi_video_bus_find_cap(video);
1781 error = acpi_video_bus_check(video);
1782 if (error)
1783 goto err_free_video;
1784
1785 mutex_init(&video->device_list_lock);
1786 INIT_LIST_HEAD(&video->video_device_list);
1787
1788 error = acpi_video_bus_get_devices(video, device);
1789 if (error)
1790 goto err_put_video;
1791
1792 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
1793 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1794 video->flags.multihead ? "yes" : "no",
1795 video->flags.rom ? "yes" : "no",
1796 video->flags.post ? "yes" : "no");
1797 mutex_lock(&video_list_lock);
1798 list_add_tail(&video->entry, &video_bus_head);
1799 mutex_unlock(&video_list_lock);
1800
1801 acpi_video_bus_register_backlight(video);
1802 acpi_video_bus_add_notify_handler(video);
1803
1804 return 0;
1805
1806 err_put_video:
1807 acpi_video_bus_put_devices(video);
1808 kfree(video->attached_array);
1809 err_free_video:
1810 kfree(video);
1811 device->driver_data = NULL;
1812
1813 return error;
1814 }
1815
1816 static int acpi_video_bus_remove(struct acpi_device *device)
1817 {
1818 struct acpi_video_bus *video = NULL;
1819
1820
1821 if (!device || !acpi_driver_data(device))
1822 return -EINVAL;
1823
1824 video = acpi_driver_data(device);
1825
1826 acpi_video_bus_remove_notify_handler(video);
1827 acpi_video_bus_unregister_backlight(video);
1828 acpi_video_bus_put_devices(video);
1829
1830 mutex_lock(&video_list_lock);
1831 list_del(&video->entry);
1832 mutex_unlock(&video_list_lock);
1833
1834 kfree(video->attached_array);
1835 kfree(video);
1836
1837 return 0;
1838 }
1839
1840 static int __init is_i740(struct pci_dev *dev)
1841 {
1842 if (dev->device == 0x00D1)
1843 return 1;
1844 if (dev->device == 0x7000)
1845 return 1;
1846 return 0;
1847 }
1848
1849 static int __init intel_opregion_present(void)
1850 {
1851 int opregion = 0;
1852 struct pci_dev *dev = NULL;
1853 u32 address;
1854
1855 for_each_pci_dev(dev) {
1856 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1857 continue;
1858 if (dev->vendor != PCI_VENDOR_ID_INTEL)
1859 continue;
1860 /* We don't want to poke around undefined i740 registers */
1861 if (is_i740(dev))
1862 continue;
1863 pci_read_config_dword(dev, 0xfc, &address);
1864 if (!address)
1865 continue;
1866 opregion = 1;
1867 }
1868 return opregion;
1869 }
1870
1871 int acpi_video_register(void)
1872 {
1873 int result = 0;
1874 if (register_count) {
1875 /*
1876 * if the function of acpi_video_register is already called,
1877 * don't register the acpi_vide_bus again and return no error.
1878 */
1879 return 0;
1880 }
1881
1882 mutex_init(&video_list_lock);
1883 INIT_LIST_HEAD(&video_bus_head);
1884
1885 result = acpi_bus_register_driver(&acpi_video_bus);
1886 if (result < 0)
1887 return -ENODEV;
1888
1889 /*
1890 * When the acpi_video_bus is loaded successfully, increase
1891 * the counter reference.
1892 */
1893 register_count = 1;
1894
1895 return 0;
1896 }
1897 EXPORT_SYMBOL(acpi_video_register);
1898
1899 void acpi_video_unregister(void)
1900 {
1901 if (!register_count) {
1902 /*
1903 * If the acpi video bus is already unloaded, don't
1904 * unload it again and return directly.
1905 */
1906 return;
1907 }
1908 acpi_bus_unregister_driver(&acpi_video_bus);
1909
1910 register_count = 0;
1911
1912 return;
1913 }
1914 EXPORT_SYMBOL(acpi_video_unregister);
1915
1916 /*
1917 * This is kind of nasty. Hardware using Intel chipsets may require
1918 * the video opregion code to be run first in order to initialise
1919 * state before any ACPI video calls are made. To handle this we defer
1920 * registration of the video class until the opregion code has run.
1921 */
1922
1923 static int __init acpi_video_init(void)
1924 {
1925 dmi_check_system(video_dmi_table);
1926
1927 if (intel_opregion_present())
1928 return 0;
1929
1930 return acpi_video_register();
1931 }
1932
1933 static void __exit acpi_video_exit(void)
1934 {
1935 acpi_video_unregister();
1936
1937 return;
1938 }
1939
1940 module_init(acpi_video_init);
1941 module_exit(acpi_video_exit);
Linux kernel - Deliverables
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