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Merge branch 'pci/resource' into next
[deliverable/linux.git] / drivers / acpi / video.c
1 /*
2 * video.c - ACPI Video Driver
3 *
4 * Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
5 * Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
6 * Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
7 *
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or (at
13 * your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
23 *
24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25 */
26
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/types.h>
31 #include <linux/list.h>
32 #include <linux/mutex.h>
33 #include <linux/input.h>
34 #include <linux/backlight.h>
35 #include <linux/thermal.h>
36 #include <linux/sort.h>
37 #include <linux/pci.h>
38 #include <linux/pci_ids.h>
39 #include <linux/slab.h>
40 #include <linux/dmi.h>
41 #include <linux/suspend.h>
42 #include <linux/acpi.h>
43 #include <acpi/video.h>
44 #include <asm/uaccess.h>
45
46 #include "internal.h"
47
48 #define PREFIX "ACPI: "
49
50 #define ACPI_VIDEO_BUS_NAME "Video Bus"
51 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
52 #define ACPI_VIDEO_NOTIFY_SWITCH 0x80
53 #define ACPI_VIDEO_NOTIFY_PROBE 0x81
54 #define ACPI_VIDEO_NOTIFY_CYCLE 0x82
55 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
56 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
57
58 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
59 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
60 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
61 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
62 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
63
64 #define MAX_NAME_LEN 20
65
66 #define _COMPONENT ACPI_VIDEO_COMPONENT
67 ACPI_MODULE_NAME("video");
68
69 MODULE_AUTHOR("Bruno Ducrot");
70 MODULE_DESCRIPTION("ACPI Video Driver");
71 MODULE_LICENSE("GPL");
72
73 static bool brightness_switch_enabled = 1;
74 module_param(brightness_switch_enabled, bool, 0644);
75
76 /*
77 * By default, we don't allow duplicate ACPI video bus devices
78 * under the same VGA controller
79 */
80 static bool allow_duplicates;
81 module_param(allow_duplicates, bool, 0644);
82
83 /*
84 * For Windows 8 systems: if set ture and the GPU driver has
85 * registered a backlight interface, skip registering ACPI video's.
86 */
87 static bool use_native_backlight = false;
88 module_param(use_native_backlight, bool, 0644);
89
90 static int register_count;
91 static struct mutex video_list_lock;
92 static struct list_head video_bus_head;
93 static int acpi_video_bus_add(struct acpi_device *device);
94 static int acpi_video_bus_remove(struct acpi_device *device);
95 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
96
97 static const struct acpi_device_id video_device_ids[] = {
98 {ACPI_VIDEO_HID, 0},
99 {"", 0},
100 };
101 MODULE_DEVICE_TABLE(acpi, video_device_ids);
102
103 static struct acpi_driver acpi_video_bus = {
104 .name = "video",
105 .class = ACPI_VIDEO_CLASS,
106 .ids = video_device_ids,
107 .ops = {
108 .add = acpi_video_bus_add,
109 .remove = acpi_video_bus_remove,
110 .notify = acpi_video_bus_notify,
111 },
112 };
113
114 struct acpi_video_bus_flags {
115 u8 multihead:1; /* can switch video heads */
116 u8 rom:1; /* can retrieve a video rom */
117 u8 post:1; /* can configure the head to */
118 u8 reserved:5;
119 };
120
121 struct acpi_video_bus_cap {
122 u8 _DOS:1; /* Enable/Disable output switching */
123 u8 _DOD:1; /* Enumerate all devices attached to display adapter */
124 u8 _ROM:1; /* Get ROM Data */
125 u8 _GPD:1; /* Get POST Device */
126 u8 _SPD:1; /* Set POST Device */
127 u8 _VPO:1; /* Video POST Options */
128 u8 reserved:2;
129 };
130
131 struct acpi_video_device_attrib {
132 u32 display_index:4; /* A zero-based instance of the Display */
133 u32 display_port_attachment:4; /* This field differentiates the display type */
134 u32 display_type:4; /* Describe the specific type in use */
135 u32 vendor_specific:4; /* Chipset Vendor Specific */
136 u32 bios_can_detect:1; /* BIOS can detect the device */
137 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to
138 the VGA device. */
139 u32 pipe_id:3; /* For VGA multiple-head devices. */
140 u32 reserved:10; /* Must be 0 */
141 u32 device_id_scheme:1; /* Device ID Scheme */
142 };
143
144 struct acpi_video_enumerated_device {
145 union {
146 u32 int_val;
147 struct acpi_video_device_attrib attrib;
148 } value;
149 struct acpi_video_device *bind_info;
150 };
151
152 struct acpi_video_bus {
153 struct acpi_device *device;
154 u8 dos_setting;
155 struct acpi_video_enumerated_device *attached_array;
156 u8 attached_count;
157 struct acpi_video_bus_cap cap;
158 struct acpi_video_bus_flags flags;
159 struct list_head video_device_list;
160 struct mutex device_list_lock; /* protects video_device_list */
161 struct list_head entry;
162 struct input_dev *input;
163 char phys[32]; /* for input device */
164 struct notifier_block pm_nb;
165 };
166
167 struct acpi_video_device_flags {
168 u8 crt:1;
169 u8 lcd:1;
170 u8 tvout:1;
171 u8 dvi:1;
172 u8 bios:1;
173 u8 unknown:1;
174 u8 notify:1;
175 u8 reserved:1;
176 };
177
178 struct acpi_video_device_cap {
179 u8 _ADR:1; /* Return the unique ID */
180 u8 _BCL:1; /* Query list of brightness control levels supported */
181 u8 _BCM:1; /* Set the brightness level */
182 u8 _BQC:1; /* Get current brightness level */
183 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
184 u8 _DDC:1; /* Return the EDID for this device */
185 };
186
187 struct acpi_video_brightness_flags {
188 u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
189 u8 _BCL_reversed:1; /* _BCL package is in a reversed order */
190 u8 _BQC_use_index:1; /* _BQC returns an index value */
191 };
192
193 struct acpi_video_device_brightness {
194 int curr;
195 int count;
196 int *levels;
197 struct acpi_video_brightness_flags flags;
198 };
199
200 struct acpi_video_device {
201 unsigned long device_id;
202 struct acpi_video_device_flags flags;
203 struct acpi_video_device_cap cap;
204 struct list_head entry;
205 struct acpi_video_bus *video;
206 struct acpi_device *dev;
207 struct acpi_video_device_brightness *brightness;
208 struct backlight_device *backlight;
209 struct thermal_cooling_device *cooling_dev;
210 };
211
212 static const char device_decode[][30] = {
213 "motherboard VGA device",
214 "PCI VGA device",
215 "AGP VGA device",
216 "UNKNOWN",
217 };
218
219 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
220 static void acpi_video_device_rebind(struct acpi_video_bus *video);
221 static void acpi_video_device_bind(struct acpi_video_bus *video,
222 struct acpi_video_device *device);
223 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
224 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
225 int level);
226 static int acpi_video_device_lcd_get_level_current(
227 struct acpi_video_device *device,
228 unsigned long long *level, bool raw);
229 static int acpi_video_get_next_level(struct acpi_video_device *device,
230 u32 level_current, u32 event);
231 static int acpi_video_switch_brightness(struct acpi_video_device *device,
232 int event);
233
234 static bool acpi_video_verify_backlight_support(void)
235 {
236 if (acpi_osi_is_win8() && use_native_backlight &&
237 backlight_device_registered(BACKLIGHT_RAW))
238 return false;
239 return acpi_video_backlight_support();
240 }
241
242 /* backlight device sysfs support */
243 static int acpi_video_get_brightness(struct backlight_device *bd)
244 {
245 unsigned long long cur_level;
246 int i;
247 struct acpi_video_device *vd = bl_get_data(bd);
248
249 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
250 return -EINVAL;
251 for (i = 2; i < vd->brightness->count; i++) {
252 if (vd->brightness->levels[i] == cur_level)
253 /*
254 * The first two entries are special - see page 575
255 * of the ACPI spec 3.0
256 */
257 return i - 2;
258 }
259 return 0;
260 }
261
262 static int acpi_video_set_brightness(struct backlight_device *bd)
263 {
264 int request_level = bd->props.brightness + 2;
265 struct acpi_video_device *vd = bl_get_data(bd);
266
267 return acpi_video_device_lcd_set_level(vd,
268 vd->brightness->levels[request_level]);
269 }
270
271 static const struct backlight_ops acpi_backlight_ops = {
272 .get_brightness = acpi_video_get_brightness,
273 .update_status = acpi_video_set_brightness,
274 };
275
276 /* thermal cooling device callbacks */
277 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
278 long *state)
279 {
280 struct acpi_device *device = cooling_dev->devdata;
281 struct acpi_video_device *video = acpi_driver_data(device);
282
283 *state = video->brightness->count - 3;
284 return 0;
285 }
286
287 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
288 long *state)
289 {
290 struct acpi_device *device = cooling_dev->devdata;
291 struct acpi_video_device *video = acpi_driver_data(device);
292 unsigned long long level;
293 int offset;
294
295 if (acpi_video_device_lcd_get_level_current(video, &level, false))
296 return -EINVAL;
297 for (offset = 2; offset < video->brightness->count; offset++)
298 if (level == video->brightness->levels[offset]) {
299 *state = video->brightness->count - offset - 1;
300 return 0;
301 }
302
303 return -EINVAL;
304 }
305
306 static int
307 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
308 {
309 struct acpi_device *device = cooling_dev->devdata;
310 struct acpi_video_device *video = acpi_driver_data(device);
311 int level;
312
313 if (state >= video->brightness->count - 2)
314 return -EINVAL;
315
316 state = video->brightness->count - state;
317 level = video->brightness->levels[state - 1];
318 return acpi_video_device_lcd_set_level(video, level);
319 }
320
321 static const struct thermal_cooling_device_ops video_cooling_ops = {
322 .get_max_state = video_get_max_state,
323 .get_cur_state = video_get_cur_state,
324 .set_cur_state = video_set_cur_state,
325 };
326
327 /*
328 * --------------------------------------------------------------------------
329 * Video Management
330 * --------------------------------------------------------------------------
331 */
332
333 static int
334 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
335 union acpi_object **levels)
336 {
337 int status;
338 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
339 union acpi_object *obj;
340
341
342 *levels = NULL;
343
344 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
345 if (!ACPI_SUCCESS(status))
346 return status;
347 obj = (union acpi_object *)buffer.pointer;
348 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
349 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
350 status = -EFAULT;
351 goto err;
352 }
353
354 *levels = obj;
355
356 return 0;
357
358 err:
359 kfree(buffer.pointer);
360
361 return status;
362 }
363
364 static int
365 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
366 {
367 int status;
368 int state;
369
370 status = acpi_execute_simple_method(device->dev->handle,
371 "_BCM", level);
372 if (ACPI_FAILURE(status)) {
373 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
374 return -EIO;
375 }
376
377 device->brightness->curr = level;
378 for (state = 2; state < device->brightness->count; state++)
379 if (level == device->brightness->levels[state]) {
380 if (device->backlight)
381 device->backlight->props.brightness = state - 2;
382 return 0;
383 }
384
385 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
386 return -EINVAL;
387 }
388
389 /*
390 * For some buggy _BQC methods, we need to add a constant value to
391 * the _BQC return value to get the actual current brightness level
392 */
393
394 static int bqc_offset_aml_bug_workaround;
395 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
396 {
397 bqc_offset_aml_bug_workaround = 9;
398 return 0;
399 }
400
401 static struct dmi_system_id video_dmi_table[] __initdata = {
402 /*
403 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
404 */
405 {
406 .callback = video_set_bqc_offset,
407 .ident = "Acer Aspire 5720",
408 .matches = {
409 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
410 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
411 },
412 },
413 {
414 .callback = video_set_bqc_offset,
415 .ident = "Acer Aspire 5710Z",
416 .matches = {
417 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
418 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
419 },
420 },
421 {
422 .callback = video_set_bqc_offset,
423 .ident = "eMachines E510",
424 .matches = {
425 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
426 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
427 },
428 },
429 {
430 .callback = video_set_bqc_offset,
431 .ident = "Acer Aspire 5315",
432 .matches = {
433 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
434 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
435 },
436 },
437 {
438 .callback = video_set_bqc_offset,
439 .ident = "Acer Aspire 7720",
440 .matches = {
441 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
442 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
443 },
444 },
445 {}
446 };
447
448 static unsigned long long
449 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
450 unsigned long long bqc_value)
451 {
452 unsigned long long level;
453
454 if (device->brightness->flags._BQC_use_index) {
455 /*
456 * _BQC returns an index that doesn't account for
457 * the first 2 items with special meaning, so we need
458 * to compensate for that by offsetting ourselves
459 */
460 if (device->brightness->flags._BCL_reversed)
461 bqc_value = device->brightness->count - 3 - bqc_value;
462
463 level = device->brightness->levels[bqc_value + 2];
464 } else {
465 level = bqc_value;
466 }
467
468 level += bqc_offset_aml_bug_workaround;
469
470 return level;
471 }
472
473 static int
474 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
475 unsigned long long *level, bool raw)
476 {
477 acpi_status status = AE_OK;
478 int i;
479
480 if (device->cap._BQC || device->cap._BCQ) {
481 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
482
483 status = acpi_evaluate_integer(device->dev->handle, buf,
484 NULL, level);
485 if (ACPI_SUCCESS(status)) {
486 if (raw) {
487 /*
488 * Caller has indicated he wants the raw
489 * value returned by _BQC, so don't furtherly
490 * mess with the value.
491 */
492 return 0;
493 }
494
495 *level = acpi_video_bqc_value_to_level(device, *level);
496
497 for (i = 2; i < device->brightness->count; i++)
498 if (device->brightness->levels[i] == *level) {
499 device->brightness->curr = *level;
500 return 0;
501 }
502 /*
503 * BQC returned an invalid level.
504 * Stop using it.
505 */
506 ACPI_WARNING((AE_INFO,
507 "%s returned an invalid level",
508 buf));
509 device->cap._BQC = device->cap._BCQ = 0;
510 } else {
511 /*
512 * Fixme:
513 * should we return an error or ignore this failure?
514 * dev->brightness->curr is a cached value which stores
515 * the correct current backlight level in most cases.
516 * ACPI video backlight still works w/ buggy _BQC.
517 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
518 */
519 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
520 device->cap._BQC = device->cap._BCQ = 0;
521 }
522 }
523
524 *level = device->brightness->curr;
525 return 0;
526 }
527
528 static int
529 acpi_video_device_EDID(struct acpi_video_device *device,
530 union acpi_object **edid, ssize_t length)
531 {
532 int status;
533 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
534 union acpi_object *obj;
535 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
536 struct acpi_object_list args = { 1, &arg0 };
537
538
539 *edid = NULL;
540
541 if (!device)
542 return -ENODEV;
543 if (length == 128)
544 arg0.integer.value = 1;
545 else if (length == 256)
546 arg0.integer.value = 2;
547 else
548 return -EINVAL;
549
550 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
551 if (ACPI_FAILURE(status))
552 return -ENODEV;
553
554 obj = buffer.pointer;
555
556 if (obj && obj->type == ACPI_TYPE_BUFFER)
557 *edid = obj;
558 else {
559 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
560 status = -EFAULT;
561 kfree(obj);
562 }
563
564 return status;
565 }
566
567 /* bus */
568
569 /*
570 * Arg:
571 * video : video bus device pointer
572 * bios_flag :
573 * 0. The system BIOS should NOT automatically switch(toggle)
574 * the active display output.
575 * 1. The system BIOS should automatically switch (toggle) the
576 * active display output. No switch event.
577 * 2. The _DGS value should be locked.
578 * 3. The system BIOS should not automatically switch (toggle) the
579 * active display output, but instead generate the display switch
580 * event notify code.
581 * lcd_flag :
582 * 0. The system BIOS should automatically control the brightness level
583 * of the LCD when the power changes from AC to DC
584 * 1. The system BIOS should NOT automatically control the brightness
585 * level of the LCD when the power changes from AC to DC.
586 * Return Value:
587 * -EINVAL wrong arg.
588 */
589
590 static int
591 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
592 {
593 acpi_status status;
594
595 if (!video->cap._DOS)
596 return 0;
597
598 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
599 return -EINVAL;
600 video->dos_setting = (lcd_flag << 2) | bios_flag;
601 status = acpi_execute_simple_method(video->device->handle, "_DOS",
602 (lcd_flag << 2) | bios_flag);
603 if (ACPI_FAILURE(status))
604 return -EIO;
605
606 return 0;
607 }
608
609 /*
610 * Simple comparison function used to sort backlight levels.
611 */
612
613 static int
614 acpi_video_cmp_level(const void *a, const void *b)
615 {
616 return *(int *)a - *(int *)b;
617 }
618
619 /*
620 * Decides if _BQC/_BCQ for this system is usable
621 *
622 * We do this by changing the level first and then read out the current
623 * brightness level, if the value does not match, find out if it is using
624 * index. If not, clear the _BQC/_BCQ capability.
625 */
626 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
627 int max_level, int current_level)
628 {
629 struct acpi_video_device_brightness *br = device->brightness;
630 int result;
631 unsigned long long level;
632 int test_level;
633
634 /* don't mess with existing known broken systems */
635 if (bqc_offset_aml_bug_workaround)
636 return 0;
637
638 /*
639 * Some systems always report current brightness level as maximum
640 * through _BQC, we need to test another value for them.
641 */
642 test_level = current_level == max_level ? br->levels[3] : max_level;
643
644 result = acpi_video_device_lcd_set_level(device, test_level);
645 if (result)
646 return result;
647
648 result = acpi_video_device_lcd_get_level_current(device, &level, true);
649 if (result)
650 return result;
651
652 if (level != test_level) {
653 /* buggy _BQC found, need to find out if it uses index */
654 if (level < br->count) {
655 if (br->flags._BCL_reversed)
656 level = br->count - 3 - level;
657 if (br->levels[level + 2] == test_level)
658 br->flags._BQC_use_index = 1;
659 }
660
661 if (!br->flags._BQC_use_index)
662 device->cap._BQC = device->cap._BCQ = 0;
663 }
664
665 return 0;
666 }
667
668
669 /*
670 * Arg:
671 * device : video output device (LCD, CRT, ..)
672 *
673 * Return Value:
674 * Maximum brightness level
675 *
676 * Allocate and initialize device->brightness.
677 */
678
679 static int
680 acpi_video_init_brightness(struct acpi_video_device *device)
681 {
682 union acpi_object *obj = NULL;
683 int i, max_level = 0, count = 0, level_ac_battery = 0;
684 unsigned long long level, level_old;
685 union acpi_object *o;
686 struct acpi_video_device_brightness *br = NULL;
687 int result = -EINVAL;
688
689 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
690 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
691 "LCD brightness level\n"));
692 goto out;
693 }
694
695 if (obj->package.count < 2)
696 goto out;
697
698 br = kzalloc(sizeof(*br), GFP_KERNEL);
699 if (!br) {
700 printk(KERN_ERR "can't allocate memory\n");
701 result = -ENOMEM;
702 goto out;
703 }
704
705 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
706 GFP_KERNEL);
707 if (!br->levels) {
708 result = -ENOMEM;
709 goto out_free;
710 }
711
712 for (i = 0; i < obj->package.count; i++) {
713 o = (union acpi_object *)&obj->package.elements[i];
714 if (o->type != ACPI_TYPE_INTEGER) {
715 printk(KERN_ERR PREFIX "Invalid data\n");
716 continue;
717 }
718 br->levels[count] = (u32) o->integer.value;
719
720 if (br->levels[count] > max_level)
721 max_level = br->levels[count];
722 count++;
723 }
724
725 /*
726 * some buggy BIOS don't export the levels
727 * when machine is on AC/Battery in _BCL package.
728 * In this case, the first two elements in _BCL packages
729 * are also supported brightness levels that OS should take care of.
730 */
731 for (i = 2; i < count; i++) {
732 if (br->levels[i] == br->levels[0])
733 level_ac_battery++;
734 if (br->levels[i] == br->levels[1])
735 level_ac_battery++;
736 }
737
738 if (level_ac_battery < 2) {
739 level_ac_battery = 2 - level_ac_battery;
740 br->flags._BCL_no_ac_battery_levels = 1;
741 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
742 br->levels[i] = br->levels[i - level_ac_battery];
743 count += level_ac_battery;
744 } else if (level_ac_battery > 2)
745 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
746
747 /* Check if the _BCL package is in a reversed order */
748 if (max_level == br->levels[2]) {
749 br->flags._BCL_reversed = 1;
750 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
751 acpi_video_cmp_level, NULL);
752 } else if (max_level != br->levels[count - 1])
753 ACPI_ERROR((AE_INFO,
754 "Found unordered _BCL package"));
755
756 br->count = count;
757 device->brightness = br;
758
759 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
760 br->curr = level = max_level;
761
762 if (!device->cap._BQC)
763 goto set_level;
764
765 result = acpi_video_device_lcd_get_level_current(device,
766 &level_old, true);
767 if (result)
768 goto out_free_levels;
769
770 result = acpi_video_bqc_quirk(device, max_level, level_old);
771 if (result)
772 goto out_free_levels;
773 /*
774 * cap._BQC may get cleared due to _BQC is found to be broken
775 * in acpi_video_bqc_quirk, so check again here.
776 */
777 if (!device->cap._BQC)
778 goto set_level;
779
780 level = acpi_video_bqc_value_to_level(device, level_old);
781 /*
782 * On some buggy laptops, _BQC returns an uninitialized
783 * value when invoked for the first time, i.e.
784 * level_old is invalid (no matter whether it's a level
785 * or an index). Set the backlight to max_level in this case.
786 */
787 for (i = 2; i < br->count; i++)
788 if (level == br->levels[i])
789 break;
790 if (i == br->count || !level)
791 level = max_level;
792
793 set_level:
794 result = acpi_video_device_lcd_set_level(device, level);
795 if (result)
796 goto out_free_levels;
797
798 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
799 "found %d brightness levels\n", count - 2));
800 kfree(obj);
801 return result;
802
803 out_free_levels:
804 kfree(br->levels);
805 out_free:
806 kfree(br);
807 out:
808 device->brightness = NULL;
809 kfree(obj);
810 return result;
811 }
812
813 /*
814 * Arg:
815 * device : video output device (LCD, CRT, ..)
816 *
817 * Return Value:
818 * None
819 *
820 * Find out all required AML methods defined under the output
821 * device.
822 */
823
824 static void acpi_video_device_find_cap(struct acpi_video_device *device)
825 {
826 if (acpi_has_method(device->dev->handle, "_ADR"))
827 device->cap._ADR = 1;
828 if (acpi_has_method(device->dev->handle, "_BCL"))
829 device->cap._BCL = 1;
830 if (acpi_has_method(device->dev->handle, "_BCM"))
831 device->cap._BCM = 1;
832 if (acpi_has_method(device->dev->handle, "_BQC")) {
833 device->cap._BQC = 1;
834 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
835 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
836 device->cap._BCQ = 1;
837 }
838
839 if (acpi_has_method(device->dev->handle, "_DDC"))
840 device->cap._DDC = 1;
841 }
842
843 /*
844 * Arg:
845 * device : video output device (VGA)
846 *
847 * Return Value:
848 * None
849 *
850 * Find out all required AML methods defined under the video bus device.
851 */
852
853 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
854 {
855 if (acpi_has_method(video->device->handle, "_DOS"))
856 video->cap._DOS = 1;
857 if (acpi_has_method(video->device->handle, "_DOD"))
858 video->cap._DOD = 1;
859 if (acpi_has_method(video->device->handle, "_ROM"))
860 video->cap._ROM = 1;
861 if (acpi_has_method(video->device->handle, "_GPD"))
862 video->cap._GPD = 1;
863 if (acpi_has_method(video->device->handle, "_SPD"))
864 video->cap._SPD = 1;
865 if (acpi_has_method(video->device->handle, "_VPO"))
866 video->cap._VPO = 1;
867 }
868
869 /*
870 * Check whether the video bus device has required AML method to
871 * support the desired features
872 */
873
874 static int acpi_video_bus_check(struct acpi_video_bus *video)
875 {
876 acpi_status status = -ENOENT;
877 struct pci_dev *dev;
878
879 if (!video)
880 return -EINVAL;
881
882 dev = acpi_get_pci_dev(video->device->handle);
883 if (!dev)
884 return -ENODEV;
885 pci_dev_put(dev);
886
887 /*
888 * Since there is no HID, CID and so on for VGA driver, we have
889 * to check well known required nodes.
890 */
891
892 /* Does this device support video switching? */
893 if (video->cap._DOS || video->cap._DOD) {
894 if (!video->cap._DOS) {
895 printk(KERN_WARNING FW_BUG
896 "ACPI(%s) defines _DOD but not _DOS\n",
897 acpi_device_bid(video->device));
898 }
899 video->flags.multihead = 1;
900 status = 0;
901 }
902
903 /* Does this device support retrieving a video ROM? */
904 if (video->cap._ROM) {
905 video->flags.rom = 1;
906 status = 0;
907 }
908
909 /* Does this device support configuring which video device to POST? */
910 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
911 video->flags.post = 1;
912 status = 0;
913 }
914
915 return status;
916 }
917
918 /*
919 * --------------------------------------------------------------------------
920 * Driver Interface
921 * --------------------------------------------------------------------------
922 */
923
924 /* device interface */
925 static struct acpi_video_device_attrib *
926 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
927 {
928 struct acpi_video_enumerated_device *ids;
929 int i;
930
931 for (i = 0; i < video->attached_count; i++) {
932 ids = &video->attached_array[i];
933 if ((ids->value.int_val & 0xffff) == device_id)
934 return &ids->value.attrib;
935 }
936
937 return NULL;
938 }
939
940 static int
941 acpi_video_get_device_type(struct acpi_video_bus *video,
942 unsigned long device_id)
943 {
944 struct acpi_video_enumerated_device *ids;
945 int i;
946
947 for (i = 0; i < video->attached_count; i++) {
948 ids = &video->attached_array[i];
949 if ((ids->value.int_val & 0xffff) == device_id)
950 return ids->value.int_val;
951 }
952
953 return 0;
954 }
955
956 static int
957 acpi_video_bus_get_one_device(struct acpi_device *device,
958 struct acpi_video_bus *video)
959 {
960 unsigned long long device_id;
961 int status, device_type;
962 struct acpi_video_device *data;
963 struct acpi_video_device_attrib *attribute;
964
965 status =
966 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
967 /* Some device omits _ADR, we skip them instead of fail */
968 if (ACPI_FAILURE(status))
969 return 0;
970
971 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
972 if (!data)
973 return -ENOMEM;
974
975 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
976 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
977 device->driver_data = data;
978
979 data->device_id = device_id;
980 data->video = video;
981 data->dev = device;
982
983 attribute = acpi_video_get_device_attr(video, device_id);
984
985 if (attribute && attribute->device_id_scheme) {
986 switch (attribute->display_type) {
987 case ACPI_VIDEO_DISPLAY_CRT:
988 data->flags.crt = 1;
989 break;
990 case ACPI_VIDEO_DISPLAY_TV:
991 data->flags.tvout = 1;
992 break;
993 case ACPI_VIDEO_DISPLAY_DVI:
994 data->flags.dvi = 1;
995 break;
996 case ACPI_VIDEO_DISPLAY_LCD:
997 data->flags.lcd = 1;
998 break;
999 default:
1000 data->flags.unknown = 1;
1001 break;
1002 }
1003 if (attribute->bios_can_detect)
1004 data->flags.bios = 1;
1005 } else {
1006 /* Check for legacy IDs */
1007 device_type = acpi_video_get_device_type(video, device_id);
1008 /* Ignore bits 16 and 18-20 */
1009 switch (device_type & 0xffe2ffff) {
1010 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1011 data->flags.crt = 1;
1012 break;
1013 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1014 data->flags.lcd = 1;
1015 break;
1016 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1017 data->flags.tvout = 1;
1018 break;
1019 default:
1020 data->flags.unknown = 1;
1021 }
1022 }
1023
1024 acpi_video_device_bind(video, data);
1025 acpi_video_device_find_cap(data);
1026
1027 mutex_lock(&video->device_list_lock);
1028 list_add_tail(&data->entry, &video->video_device_list);
1029 mutex_unlock(&video->device_list_lock);
1030
1031 return status;
1032 }
1033
1034 /*
1035 * Arg:
1036 * video : video bus device
1037 *
1038 * Return:
1039 * none
1040 *
1041 * Enumerate the video device list of the video bus,
1042 * bind the ids with the corresponding video devices
1043 * under the video bus.
1044 */
1045
1046 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1047 {
1048 struct acpi_video_device *dev;
1049
1050 mutex_lock(&video->device_list_lock);
1051
1052 list_for_each_entry(dev, &video->video_device_list, entry)
1053 acpi_video_device_bind(video, dev);
1054
1055 mutex_unlock(&video->device_list_lock);
1056 }
1057
1058 /*
1059 * Arg:
1060 * video : video bus device
1061 * device : video output device under the video
1062 * bus
1063 *
1064 * Return:
1065 * none
1066 *
1067 * Bind the ids with the corresponding video devices
1068 * under the video bus.
1069 */
1070
1071 static void
1072 acpi_video_device_bind(struct acpi_video_bus *video,
1073 struct acpi_video_device *device)
1074 {
1075 struct acpi_video_enumerated_device *ids;
1076 int i;
1077
1078 for (i = 0; i < video->attached_count; i++) {
1079 ids = &video->attached_array[i];
1080 if (device->device_id == (ids->value.int_val & 0xffff)) {
1081 ids->bind_info = device;
1082 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1083 }
1084 }
1085 }
1086
1087 /*
1088 * Arg:
1089 * video : video bus device
1090 *
1091 * Return:
1092 * < 0 : error
1093 *
1094 * Call _DOD to enumerate all devices attached to display adapter
1095 *
1096 */
1097
1098 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1099 {
1100 int status;
1101 int count;
1102 int i;
1103 struct acpi_video_enumerated_device *active_list;
1104 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1105 union acpi_object *dod = NULL;
1106 union acpi_object *obj;
1107
1108 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1109 if (!ACPI_SUCCESS(status)) {
1110 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1111 return status;
1112 }
1113
1114 dod = buffer.pointer;
1115 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1116 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1117 status = -EFAULT;
1118 goto out;
1119 }
1120
1121 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1122 dod->package.count));
1123
1124 active_list = kcalloc(1 + dod->package.count,
1125 sizeof(struct acpi_video_enumerated_device),
1126 GFP_KERNEL);
1127 if (!active_list) {
1128 status = -ENOMEM;
1129 goto out;
1130 }
1131
1132 count = 0;
1133 for (i = 0; i < dod->package.count; i++) {
1134 obj = &dod->package.elements[i];
1135
1136 if (obj->type != ACPI_TYPE_INTEGER) {
1137 printk(KERN_ERR PREFIX
1138 "Invalid _DOD data in element %d\n", i);
1139 continue;
1140 }
1141
1142 active_list[count].value.int_val = obj->integer.value;
1143 active_list[count].bind_info = NULL;
1144 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1145 (int)obj->integer.value));
1146 count++;
1147 }
1148
1149 kfree(video->attached_array);
1150
1151 video->attached_array = active_list;
1152 video->attached_count = count;
1153
1154 out:
1155 kfree(buffer.pointer);
1156 return status;
1157 }
1158
1159 static int
1160 acpi_video_get_next_level(struct acpi_video_device *device,
1161 u32 level_current, u32 event)
1162 {
1163 int min, max, min_above, max_below, i, l, delta = 255;
1164 max = max_below = 0;
1165 min = min_above = 255;
1166 /* Find closest level to level_current */
1167 for (i = 2; i < device->brightness->count; i++) {
1168 l = device->brightness->levels[i];
1169 if (abs(l - level_current) < abs(delta)) {
1170 delta = l - level_current;
1171 if (!delta)
1172 break;
1173 }
1174 }
1175 /* Ajust level_current to closest available level */
1176 level_current += delta;
1177 for (i = 2; i < device->brightness->count; i++) {
1178 l = device->brightness->levels[i];
1179 if (l < min)
1180 min = l;
1181 if (l > max)
1182 max = l;
1183 if (l < min_above && l > level_current)
1184 min_above = l;
1185 if (l > max_below && l < level_current)
1186 max_below = l;
1187 }
1188
1189 switch (event) {
1190 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1191 return (level_current < max) ? min_above : min;
1192 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1193 return (level_current < max) ? min_above : max;
1194 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1195 return (level_current > min) ? max_below : min;
1196 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1197 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1198 return 0;
1199 default:
1200 return level_current;
1201 }
1202 }
1203
1204 static int
1205 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1206 {
1207 unsigned long long level_current, level_next;
1208 int result = -EINVAL;
1209
1210 /* no warning message if acpi_backlight=vendor or a quirk is used */
1211 if (!acpi_video_verify_backlight_support())
1212 return 0;
1213
1214 if (!device->brightness)
1215 goto out;
1216
1217 result = acpi_video_device_lcd_get_level_current(device,
1218 &level_current,
1219 false);
1220 if (result)
1221 goto out;
1222
1223 level_next = acpi_video_get_next_level(device, level_current, event);
1224
1225 result = acpi_video_device_lcd_set_level(device, level_next);
1226
1227 if (!result)
1228 backlight_force_update(device->backlight,
1229 BACKLIGHT_UPDATE_HOTKEY);
1230
1231 out:
1232 if (result)
1233 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1234
1235 return result;
1236 }
1237
1238 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1239 void **edid)
1240 {
1241 struct acpi_video_bus *video;
1242 struct acpi_video_device *video_device;
1243 union acpi_object *buffer = NULL;
1244 acpi_status status;
1245 int i, length;
1246
1247 if (!device || !acpi_driver_data(device))
1248 return -EINVAL;
1249
1250 video = acpi_driver_data(device);
1251
1252 for (i = 0; i < video->attached_count; i++) {
1253 video_device = video->attached_array[i].bind_info;
1254 length = 256;
1255
1256 if (!video_device)
1257 continue;
1258
1259 if (!video_device->cap._DDC)
1260 continue;
1261
1262 if (type) {
1263 switch (type) {
1264 case ACPI_VIDEO_DISPLAY_CRT:
1265 if (!video_device->flags.crt)
1266 continue;
1267 break;
1268 case ACPI_VIDEO_DISPLAY_TV:
1269 if (!video_device->flags.tvout)
1270 continue;
1271 break;
1272 case ACPI_VIDEO_DISPLAY_DVI:
1273 if (!video_device->flags.dvi)
1274 continue;
1275 break;
1276 case ACPI_VIDEO_DISPLAY_LCD:
1277 if (!video_device->flags.lcd)
1278 continue;
1279 break;
1280 }
1281 } else if (video_device->device_id != device_id) {
1282 continue;
1283 }
1284
1285 status = acpi_video_device_EDID(video_device, &buffer, length);
1286
1287 if (ACPI_FAILURE(status) || !buffer ||
1288 buffer->type != ACPI_TYPE_BUFFER) {
1289 length = 128;
1290 status = acpi_video_device_EDID(video_device, &buffer,
1291 length);
1292 if (ACPI_FAILURE(status) || !buffer ||
1293 buffer->type != ACPI_TYPE_BUFFER) {
1294 continue;
1295 }
1296 }
1297
1298 *edid = buffer->buffer.pointer;
1299 return length;
1300 }
1301
1302 return -ENODEV;
1303 }
1304 EXPORT_SYMBOL(acpi_video_get_edid);
1305
1306 static int
1307 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1308 struct acpi_device *device)
1309 {
1310 int status = 0;
1311 struct acpi_device *dev;
1312
1313 /*
1314 * There are systems where video module known to work fine regardless
1315 * of broken _DOD and ignoring returned value here doesn't cause
1316 * any issues later.
1317 */
1318 acpi_video_device_enumerate(video);
1319
1320 list_for_each_entry(dev, &device->children, node) {
1321
1322 status = acpi_video_bus_get_one_device(dev, video);
1323 if (status) {
1324 dev_err(&dev->dev, "Can't attach device\n");
1325 break;
1326 }
1327 }
1328 return status;
1329 }
1330
1331 /* acpi_video interface */
1332
1333 /*
1334 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1335 * preform any automatic brightness change on receiving a notification.
1336 */
1337 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1338 {
1339 return acpi_video_bus_DOS(video, 0,
1340 acpi_osi_is_win8() ? 1 : 0);
1341 }
1342
1343 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1344 {
1345 return acpi_video_bus_DOS(video, 0,
1346 acpi_osi_is_win8() ? 0 : 1);
1347 }
1348
1349 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1350 {
1351 struct acpi_video_bus *video = acpi_driver_data(device);
1352 struct input_dev *input;
1353 int keycode = 0;
1354
1355 if (!video || !video->input)
1356 return;
1357
1358 input = video->input;
1359
1360 switch (event) {
1361 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1362 * most likely via hotkey. */
1363 keycode = KEY_SWITCHVIDEOMODE;
1364 break;
1365
1366 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1367 * connector. */
1368 acpi_video_device_enumerate(video);
1369 acpi_video_device_rebind(video);
1370 keycode = KEY_SWITCHVIDEOMODE;
1371 break;
1372
1373 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1374 keycode = KEY_SWITCHVIDEOMODE;
1375 break;
1376 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1377 keycode = KEY_VIDEO_NEXT;
1378 break;
1379 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1380 keycode = KEY_VIDEO_PREV;
1381 break;
1382
1383 default:
1384 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1385 "Unsupported event [0x%x]\n", event));
1386 break;
1387 }
1388
1389 if (acpi_notifier_call_chain(device, event, 0))
1390 /* Something vetoed the keypress. */
1391 keycode = 0;
1392
1393 if (keycode) {
1394 input_report_key(input, keycode, 1);
1395 input_sync(input);
1396 input_report_key(input, keycode, 0);
1397 input_sync(input);
1398 }
1399
1400 return;
1401 }
1402
1403 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1404 {
1405 struct acpi_video_device *video_device = data;
1406 struct acpi_device *device = NULL;
1407 struct acpi_video_bus *bus;
1408 struct input_dev *input;
1409 int keycode = 0;
1410
1411 if (!video_device)
1412 return;
1413
1414 device = video_device->dev;
1415 bus = video_device->video;
1416 input = bus->input;
1417
1418 switch (event) {
1419 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1420 if (brightness_switch_enabled)
1421 acpi_video_switch_brightness(video_device, event);
1422 keycode = KEY_BRIGHTNESS_CYCLE;
1423 break;
1424 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1425 if (brightness_switch_enabled)
1426 acpi_video_switch_brightness(video_device, event);
1427 keycode = KEY_BRIGHTNESSUP;
1428 break;
1429 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1430 if (brightness_switch_enabled)
1431 acpi_video_switch_brightness(video_device, event);
1432 keycode = KEY_BRIGHTNESSDOWN;
1433 break;
1434 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1435 if (brightness_switch_enabled)
1436 acpi_video_switch_brightness(video_device, event);
1437 keycode = KEY_BRIGHTNESS_ZERO;
1438 break;
1439 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1440 if (brightness_switch_enabled)
1441 acpi_video_switch_brightness(video_device, event);
1442 keycode = KEY_DISPLAY_OFF;
1443 break;
1444 default:
1445 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1446 "Unsupported event [0x%x]\n", event));
1447 break;
1448 }
1449
1450 acpi_notifier_call_chain(device, event, 0);
1451
1452 if (keycode) {
1453 input_report_key(input, keycode, 1);
1454 input_sync(input);
1455 input_report_key(input, keycode, 0);
1456 input_sync(input);
1457 }
1458
1459 return;
1460 }
1461
1462 static int acpi_video_resume(struct notifier_block *nb,
1463 unsigned long val, void *ign)
1464 {
1465 struct acpi_video_bus *video;
1466 struct acpi_video_device *video_device;
1467 int i;
1468
1469 switch (val) {
1470 case PM_HIBERNATION_PREPARE:
1471 case PM_SUSPEND_PREPARE:
1472 case PM_RESTORE_PREPARE:
1473 return NOTIFY_DONE;
1474 }
1475
1476 video = container_of(nb, struct acpi_video_bus, pm_nb);
1477
1478 dev_info(&video->device->dev, "Restoring backlight state\n");
1479
1480 for (i = 0; i < video->attached_count; i++) {
1481 video_device = video->attached_array[i].bind_info;
1482 if (video_device && video_device->backlight)
1483 acpi_video_set_brightness(video_device->backlight);
1484 }
1485
1486 return NOTIFY_OK;
1487 }
1488
1489 static acpi_status
1490 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1491 void **return_value)
1492 {
1493 struct acpi_device *device = context;
1494 struct acpi_device *sibling;
1495 int result;
1496
1497 if (handle == device->handle)
1498 return AE_CTRL_TERMINATE;
1499
1500 result = acpi_bus_get_device(handle, &sibling);
1501 if (result)
1502 return AE_OK;
1503
1504 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1505 return AE_ALREADY_EXISTS;
1506
1507 return AE_OK;
1508 }
1509
1510 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1511 {
1512 if (acpi_video_verify_backlight_support()) {
1513 struct backlight_properties props;
1514 struct pci_dev *pdev;
1515 acpi_handle acpi_parent;
1516 struct device *parent = NULL;
1517 int result;
1518 static int count;
1519 char *name;
1520
1521 result = acpi_video_init_brightness(device);
1522 if (result)
1523 return;
1524 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1525 if (!name)
1526 return;
1527 count++;
1528
1529 acpi_get_parent(device->dev->handle, &acpi_parent);
1530
1531 pdev = acpi_get_pci_dev(acpi_parent);
1532 if (pdev) {
1533 parent = &pdev->dev;
1534 pci_dev_put(pdev);
1535 }
1536
1537 memset(&props, 0, sizeof(struct backlight_properties));
1538 props.type = BACKLIGHT_FIRMWARE;
1539 props.max_brightness = device->brightness->count - 3;
1540 device->backlight = backlight_device_register(name,
1541 parent,
1542 device,
1543 &acpi_backlight_ops,
1544 &props);
1545 kfree(name);
1546 if (IS_ERR(device->backlight))
1547 return;
1548
1549 /*
1550 * Save current brightness level in case we have to restore it
1551 * before acpi_video_device_lcd_set_level() is called next time.
1552 */
1553 device->backlight->props.brightness =
1554 acpi_video_get_brightness(device->backlight);
1555
1556 device->cooling_dev = thermal_cooling_device_register("LCD",
1557 device->dev, &video_cooling_ops);
1558 if (IS_ERR(device->cooling_dev)) {
1559 /*
1560 * Set cooling_dev to NULL so we don't crash trying to
1561 * free it.
1562 * Also, why the hell we are returning early and
1563 * not attempt to register video output if cooling
1564 * device registration failed?
1565 * -- dtor
1566 */
1567 device->cooling_dev = NULL;
1568 return;
1569 }
1570
1571 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1572 device->cooling_dev->id);
1573 result = sysfs_create_link(&device->dev->dev.kobj,
1574 &device->cooling_dev->device.kobj,
1575 "thermal_cooling");
1576 if (result)
1577 printk(KERN_ERR PREFIX "Create sysfs link\n");
1578 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1579 &device->dev->dev.kobj, "device");
1580 if (result)
1581 printk(KERN_ERR PREFIX "Create sysfs link\n");
1582 }
1583 }
1584
1585 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1586 {
1587 struct acpi_video_device *dev;
1588
1589 mutex_lock(&video->device_list_lock);
1590 list_for_each_entry(dev, &video->video_device_list, entry)
1591 acpi_video_dev_register_backlight(dev);
1592 mutex_unlock(&video->device_list_lock);
1593
1594 video->pm_nb.notifier_call = acpi_video_resume;
1595 video->pm_nb.priority = 0;
1596 return register_pm_notifier(&video->pm_nb);
1597 }
1598
1599 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1600 {
1601 if (device->backlight) {
1602 backlight_device_unregister(device->backlight);
1603 device->backlight = NULL;
1604 }
1605 if (device->brightness) {
1606 kfree(device->brightness->levels);
1607 kfree(device->brightness);
1608 device->brightness = NULL;
1609 }
1610 if (device->cooling_dev) {
1611 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1612 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1613 thermal_cooling_device_unregister(device->cooling_dev);
1614 device->cooling_dev = NULL;
1615 }
1616 }
1617
1618 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1619 {
1620 struct acpi_video_device *dev;
1621 int error = unregister_pm_notifier(&video->pm_nb);
1622
1623 mutex_lock(&video->device_list_lock);
1624 list_for_each_entry(dev, &video->video_device_list, entry)
1625 acpi_video_dev_unregister_backlight(dev);
1626 mutex_unlock(&video->device_list_lock);
1627
1628 return error;
1629 }
1630
1631 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1632 {
1633 acpi_status status;
1634 struct acpi_device *adev = device->dev;
1635
1636 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1637 acpi_video_device_notify, device);
1638 if (ACPI_FAILURE(status))
1639 dev_err(&adev->dev, "Error installing notify handler\n");
1640 else
1641 device->flags.notify = 1;
1642 }
1643
1644 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1645 {
1646 struct input_dev *input;
1647 struct acpi_video_device *dev;
1648 int error;
1649
1650 video->input = input = input_allocate_device();
1651 if (!input) {
1652 error = -ENOMEM;
1653 goto out;
1654 }
1655
1656 error = acpi_video_bus_start_devices(video);
1657 if (error)
1658 goto err_free_input;
1659
1660 snprintf(video->phys, sizeof(video->phys),
1661 "%s/video/input0", acpi_device_hid(video->device));
1662
1663 input->name = acpi_device_name(video->device);
1664 input->phys = video->phys;
1665 input->id.bustype = BUS_HOST;
1666 input->id.product = 0x06;
1667 input->dev.parent = &video->device->dev;
1668 input->evbit[0] = BIT(EV_KEY);
1669 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1670 set_bit(KEY_VIDEO_NEXT, input->keybit);
1671 set_bit(KEY_VIDEO_PREV, input->keybit);
1672 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1673 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1674 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1675 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1676 set_bit(KEY_DISPLAY_OFF, input->keybit);
1677
1678 error = input_register_device(input);
1679 if (error)
1680 goto err_stop_dev;
1681
1682 mutex_lock(&video->device_list_lock);
1683 list_for_each_entry(dev, &video->video_device_list, entry)
1684 acpi_video_dev_add_notify_handler(dev);
1685 mutex_unlock(&video->device_list_lock);
1686
1687 return 0;
1688
1689 err_stop_dev:
1690 acpi_video_bus_stop_devices(video);
1691 err_free_input:
1692 input_free_device(input);
1693 video->input = NULL;
1694 out:
1695 return error;
1696 }
1697
1698 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1699 {
1700 if (dev->flags.notify) {
1701 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1702 acpi_video_device_notify);
1703 dev->flags.notify = 0;
1704 }
1705 }
1706
1707 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1708 {
1709 struct acpi_video_device *dev;
1710
1711 mutex_lock(&video->device_list_lock);
1712 list_for_each_entry(dev, &video->video_device_list, entry)
1713 acpi_video_dev_remove_notify_handler(dev);
1714 mutex_unlock(&video->device_list_lock);
1715
1716 acpi_video_bus_stop_devices(video);
1717 input_unregister_device(video->input);
1718 video->input = NULL;
1719 }
1720
1721 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1722 {
1723 struct acpi_video_device *dev, *next;
1724
1725 mutex_lock(&video->device_list_lock);
1726 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1727 list_del(&dev->entry);
1728 kfree(dev);
1729 }
1730 mutex_unlock(&video->device_list_lock);
1731
1732 return 0;
1733 }
1734
1735 static int instance;
1736
1737 static int acpi_video_bus_add(struct acpi_device *device)
1738 {
1739 struct acpi_video_bus *video;
1740 int error;
1741 acpi_status status;
1742
1743 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1744 device->parent->handle, 1,
1745 acpi_video_bus_match, NULL,
1746 device, NULL);
1747 if (status == AE_ALREADY_EXISTS) {
1748 printk(KERN_WARNING FW_BUG
1749 "Duplicate ACPI video bus devices for the"
1750 " same VGA controller, please try module "
1751 "parameter \"video.allow_duplicates=1\""
1752 "if the current driver doesn't work.\n");
1753 if (!allow_duplicates)
1754 return -ENODEV;
1755 }
1756
1757 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1758 if (!video)
1759 return -ENOMEM;
1760
1761 /* a hack to fix the duplicate name "VID" problem on T61 */
1762 if (!strcmp(device->pnp.bus_id, "VID")) {
1763 if (instance)
1764 device->pnp.bus_id[3] = '0' + instance;
1765 instance++;
1766 }
1767 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1768 if (!strcmp(device->pnp.bus_id, "VGA")) {
1769 if (instance)
1770 device->pnp.bus_id[3] = '0' + instance;
1771 instance++;
1772 }
1773
1774 video->device = device;
1775 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1776 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1777 device->driver_data = video;
1778
1779 acpi_video_bus_find_cap(video);
1780 error = acpi_video_bus_check(video);
1781 if (error)
1782 goto err_free_video;
1783
1784 mutex_init(&video->device_list_lock);
1785 INIT_LIST_HEAD(&video->video_device_list);
1786
1787 error = acpi_video_bus_get_devices(video, device);
1788 if (error)
1789 goto err_put_video;
1790
1791 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
1792 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1793 video->flags.multihead ? "yes" : "no",
1794 video->flags.rom ? "yes" : "no",
1795 video->flags.post ? "yes" : "no");
1796 mutex_lock(&video_list_lock);
1797 list_add_tail(&video->entry, &video_bus_head);
1798 mutex_unlock(&video_list_lock);
1799
1800 acpi_video_bus_register_backlight(video);
1801 acpi_video_bus_add_notify_handler(video);
1802
1803 return 0;
1804
1805 err_put_video:
1806 acpi_video_bus_put_devices(video);
1807 kfree(video->attached_array);
1808 err_free_video:
1809 kfree(video);
1810 device->driver_data = NULL;
1811
1812 return error;
1813 }
1814
1815 static int acpi_video_bus_remove(struct acpi_device *device)
1816 {
1817 struct acpi_video_bus *video = NULL;
1818
1819
1820 if (!device || !acpi_driver_data(device))
1821 return -EINVAL;
1822
1823 video = acpi_driver_data(device);
1824
1825 acpi_video_bus_remove_notify_handler(video);
1826 acpi_video_bus_unregister_backlight(video);
1827 acpi_video_bus_put_devices(video);
1828
1829 mutex_lock(&video_list_lock);
1830 list_del(&video->entry);
1831 mutex_unlock(&video_list_lock);
1832
1833 kfree(video->attached_array);
1834 kfree(video);
1835
1836 return 0;
1837 }
1838
1839 static int __init is_i740(struct pci_dev *dev)
1840 {
1841 if (dev->device == 0x00D1)
1842 return 1;
1843 if (dev->device == 0x7000)
1844 return 1;
1845 return 0;
1846 }
1847
1848 static int __init intel_opregion_present(void)
1849 {
1850 int opregion = 0;
1851 struct pci_dev *dev = NULL;
1852 u32 address;
1853
1854 for_each_pci_dev(dev) {
1855 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1856 continue;
1857 if (dev->vendor != PCI_VENDOR_ID_INTEL)
1858 continue;
1859 /* We don't want to poke around undefined i740 registers */
1860 if (is_i740(dev))
1861 continue;
1862 pci_read_config_dword(dev, 0xfc, &address);
1863 if (!address)
1864 continue;
1865 opregion = 1;
1866 }
1867 return opregion;
1868 }
1869
1870 int acpi_video_register(void)
1871 {
1872 int result = 0;
1873 if (register_count) {
1874 /*
1875 * if the function of acpi_video_register is already called,
1876 * don't register the acpi_vide_bus again and return no error.
1877 */
1878 return 0;
1879 }
1880
1881 mutex_init(&video_list_lock);
1882 INIT_LIST_HEAD(&video_bus_head);
1883
1884 result = acpi_bus_register_driver(&acpi_video_bus);
1885 if (result < 0)
1886 return -ENODEV;
1887
1888 /*
1889 * When the acpi_video_bus is loaded successfully, increase
1890 * the counter reference.
1891 */
1892 register_count = 1;
1893
1894 return 0;
1895 }
1896 EXPORT_SYMBOL(acpi_video_register);
1897
1898 void acpi_video_unregister(void)
1899 {
1900 if (!register_count) {
1901 /*
1902 * If the acpi video bus is already unloaded, don't
1903 * unload it again and return directly.
1904 */
1905 return;
1906 }
1907 acpi_bus_unregister_driver(&acpi_video_bus);
1908
1909 register_count = 0;
1910
1911 return;
1912 }
1913 EXPORT_SYMBOL(acpi_video_unregister);
1914
1915 /*
1916 * This is kind of nasty. Hardware using Intel chipsets may require
1917 * the video opregion code to be run first in order to initialise
1918 * state before any ACPI video calls are made. To handle this we defer
1919 * registration of the video class until the opregion code has run.
1920 */
1921
1922 static int __init acpi_video_init(void)
1923 {
1924 dmi_check_system(video_dmi_table);
1925
1926 if (intel_opregion_present())
1927 return 0;
1928
1929 return acpi_video_register();
1930 }
1931
1932 static void __exit acpi_video_exit(void)
1933 {
1934 acpi_video_unregister();
1935
1936 return;
1937 }
1938
1939 module_init(acpi_video_init);
1940 module_exit(acpi_video_exit);
Linux kernel - Deliverables
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