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[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 * Some BIOSes claim they use minimum backlight at boot,
86 * and this may bring dimming screen after boot
87 */
88 static bool use_bios_initial_backlight = 1;
89 module_param(use_bios_initial_backlight, bool, 0644);
90
91 /*
92 * For Windows 8 systems: if set ture and the GPU driver has
93 * registered a backlight interface, skip registering ACPI video's.
94 */
95 static bool use_native_backlight = false;
96 module_param(use_native_backlight, bool, 0644);
97
98 static int register_count;
99 static struct mutex video_list_lock;
100 static struct list_head video_bus_head;
101 static int acpi_video_bus_add(struct acpi_device *device);
102 static int acpi_video_bus_remove(struct acpi_device *device);
103 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
104
105 static const struct acpi_device_id video_device_ids[] = {
106 {ACPI_VIDEO_HID, 0},
107 {"", 0},
108 };
109 MODULE_DEVICE_TABLE(acpi, video_device_ids);
110
111 static struct acpi_driver acpi_video_bus = {
112 .name = "video",
113 .class = ACPI_VIDEO_CLASS,
114 .ids = video_device_ids,
115 .ops = {
116 .add = acpi_video_bus_add,
117 .remove = acpi_video_bus_remove,
118 .notify = acpi_video_bus_notify,
119 },
120 };
121
122 struct acpi_video_bus_flags {
123 u8 multihead:1; /* can switch video heads */
124 u8 rom:1; /* can retrieve a video rom */
125 u8 post:1; /* can configure the head to */
126 u8 reserved:5;
127 };
128
129 struct acpi_video_bus_cap {
130 u8 _DOS:1; /* Enable/Disable output switching */
131 u8 _DOD:1; /* Enumerate all devices attached to display adapter */
132 u8 _ROM:1; /* Get ROM Data */
133 u8 _GPD:1; /* Get POST Device */
134 u8 _SPD:1; /* Set POST Device */
135 u8 _VPO:1; /* Video POST Options */
136 u8 reserved:2;
137 };
138
139 struct acpi_video_device_attrib {
140 u32 display_index:4; /* A zero-based instance of the Display */
141 u32 display_port_attachment:4; /* This field differentiates the display type */
142 u32 display_type:4; /* Describe the specific type in use */
143 u32 vendor_specific:4; /* Chipset Vendor Specific */
144 u32 bios_can_detect:1; /* BIOS can detect the device */
145 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to
146 the VGA device. */
147 u32 pipe_id:3; /* For VGA multiple-head devices. */
148 u32 reserved:10; /* Must be 0 */
149 u32 device_id_scheme:1; /* Device ID Scheme */
150 };
151
152 struct acpi_video_enumerated_device {
153 union {
154 u32 int_val;
155 struct acpi_video_device_attrib attrib;
156 } value;
157 struct acpi_video_device *bind_info;
158 };
159
160 struct acpi_video_bus {
161 struct acpi_device *device;
162 u8 dos_setting;
163 struct acpi_video_enumerated_device *attached_array;
164 u8 attached_count;
165 struct acpi_video_bus_cap cap;
166 struct acpi_video_bus_flags flags;
167 struct list_head video_device_list;
168 struct mutex device_list_lock; /* protects video_device_list */
169 struct list_head entry;
170 struct input_dev *input;
171 char phys[32]; /* for input device */
172 struct notifier_block pm_nb;
173 };
174
175 struct acpi_video_device_flags {
176 u8 crt:1;
177 u8 lcd:1;
178 u8 tvout:1;
179 u8 dvi:1;
180 u8 bios:1;
181 u8 unknown:1;
182 u8 notify:1;
183 u8 reserved:1;
184 };
185
186 struct acpi_video_device_cap {
187 u8 _ADR:1; /* Return the unique ID */
188 u8 _BCL:1; /* Query list of brightness control levels supported */
189 u8 _BCM:1; /* Set the brightness level */
190 u8 _BQC:1; /* Get current brightness level */
191 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
192 u8 _DDC:1; /* Return the EDID for this device */
193 };
194
195 struct acpi_video_brightness_flags {
196 u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
197 u8 _BCL_reversed:1; /* _BCL package is in a reversed order */
198 u8 _BQC_use_index:1; /* _BQC returns an index value */
199 };
200
201 struct acpi_video_device_brightness {
202 int curr;
203 int count;
204 int *levels;
205 struct acpi_video_brightness_flags flags;
206 };
207
208 struct acpi_video_device {
209 unsigned long device_id;
210 struct acpi_video_device_flags flags;
211 struct acpi_video_device_cap cap;
212 struct list_head entry;
213 struct acpi_video_bus *video;
214 struct acpi_device *dev;
215 struct acpi_video_device_brightness *brightness;
216 struct backlight_device *backlight;
217 struct thermal_cooling_device *cooling_dev;
218 };
219
220 static const char device_decode[][30] = {
221 "motherboard VGA device",
222 "PCI VGA device",
223 "AGP VGA device",
224 "UNKNOWN",
225 };
226
227 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
228 static void acpi_video_device_rebind(struct acpi_video_bus *video);
229 static void acpi_video_device_bind(struct acpi_video_bus *video,
230 struct acpi_video_device *device);
231 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
232 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
233 int level);
234 static int acpi_video_device_lcd_get_level_current(
235 struct acpi_video_device *device,
236 unsigned long long *level, bool raw);
237 static int acpi_video_get_next_level(struct acpi_video_device *device,
238 u32 level_current, u32 event);
239 static int acpi_video_switch_brightness(struct acpi_video_device *device,
240 int event);
241
242 static bool acpi_video_verify_backlight_support(void)
243 {
244 if (acpi_osi_is_win8() && use_native_backlight &&
245 backlight_device_registered(BACKLIGHT_RAW))
246 return false;
247 return acpi_video_backlight_support();
248 }
249
250 /* backlight device sysfs support */
251 static int acpi_video_get_brightness(struct backlight_device *bd)
252 {
253 unsigned long long cur_level;
254 int i;
255 struct acpi_video_device *vd = bl_get_data(bd);
256
257 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
258 return -EINVAL;
259 for (i = 2; i < vd->brightness->count; i++) {
260 if (vd->brightness->levels[i] == cur_level)
261 /*
262 * The first two entries are special - see page 575
263 * of the ACPI spec 3.0
264 */
265 return i - 2;
266 }
267 return 0;
268 }
269
270 static int acpi_video_set_brightness(struct backlight_device *bd)
271 {
272 int request_level = bd->props.brightness + 2;
273 struct acpi_video_device *vd = bl_get_data(bd);
274
275 return acpi_video_device_lcd_set_level(vd,
276 vd->brightness->levels[request_level]);
277 }
278
279 static const struct backlight_ops acpi_backlight_ops = {
280 .get_brightness = acpi_video_get_brightness,
281 .update_status = acpi_video_set_brightness,
282 };
283
284 /* thermal cooling device callbacks */
285 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
286 long *state)
287 {
288 struct acpi_device *device = cooling_dev->devdata;
289 struct acpi_video_device *video = acpi_driver_data(device);
290
291 *state = video->brightness->count - 3;
292 return 0;
293 }
294
295 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
296 long *state)
297 {
298 struct acpi_device *device = cooling_dev->devdata;
299 struct acpi_video_device *video = acpi_driver_data(device);
300 unsigned long long level;
301 int offset;
302
303 if (acpi_video_device_lcd_get_level_current(video, &level, false))
304 return -EINVAL;
305 for (offset = 2; offset < video->brightness->count; offset++)
306 if (level == video->brightness->levels[offset]) {
307 *state = video->brightness->count - offset - 1;
308 return 0;
309 }
310
311 return -EINVAL;
312 }
313
314 static int
315 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
316 {
317 struct acpi_device *device = cooling_dev->devdata;
318 struct acpi_video_device *video = acpi_driver_data(device);
319 int level;
320
321 if (state >= video->brightness->count - 2)
322 return -EINVAL;
323
324 state = video->brightness->count - state;
325 level = video->brightness->levels[state - 1];
326 return acpi_video_device_lcd_set_level(video, level);
327 }
328
329 static const struct thermal_cooling_device_ops video_cooling_ops = {
330 .get_max_state = video_get_max_state,
331 .get_cur_state = video_get_cur_state,
332 .set_cur_state = video_set_cur_state,
333 };
334
335 /*
336 * --------------------------------------------------------------------------
337 * Video Management
338 * --------------------------------------------------------------------------
339 */
340
341 static int
342 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
343 union acpi_object **levels)
344 {
345 int status;
346 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
347 union acpi_object *obj;
348
349
350 *levels = NULL;
351
352 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
353 if (!ACPI_SUCCESS(status))
354 return status;
355 obj = (union acpi_object *)buffer.pointer;
356 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
357 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
358 status = -EFAULT;
359 goto err;
360 }
361
362 *levels = obj;
363
364 return 0;
365
366 err:
367 kfree(buffer.pointer);
368
369 return status;
370 }
371
372 static int
373 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
374 {
375 int status;
376 int state;
377
378 status = acpi_execute_simple_method(device->dev->handle,
379 "_BCM", level);
380 if (ACPI_FAILURE(status)) {
381 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
382 return -EIO;
383 }
384
385 device->brightness->curr = level;
386 for (state = 2; state < device->brightness->count; state++)
387 if (level == device->brightness->levels[state]) {
388 if (device->backlight)
389 device->backlight->props.brightness = state - 2;
390 return 0;
391 }
392
393 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
394 return -EINVAL;
395 }
396
397 /*
398 * For some buggy _BQC methods, we need to add a constant value to
399 * the _BQC return value to get the actual current brightness level
400 */
401
402 static int bqc_offset_aml_bug_workaround;
403 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
404 {
405 bqc_offset_aml_bug_workaround = 9;
406 return 0;
407 }
408
409 static int video_ignore_initial_backlight(const struct dmi_system_id *d)
410 {
411 use_bios_initial_backlight = 0;
412 return 0;
413 }
414
415 static struct dmi_system_id video_dmi_table[] __initdata = {
416 /*
417 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
418 */
419 {
420 .callback = video_set_bqc_offset,
421 .ident = "Acer Aspire 5720",
422 .matches = {
423 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
424 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
425 },
426 },
427 {
428 .callback = video_set_bqc_offset,
429 .ident = "Acer Aspire 5710Z",
430 .matches = {
431 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
432 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
433 },
434 },
435 {
436 .callback = video_set_bqc_offset,
437 .ident = "eMachines E510",
438 .matches = {
439 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
440 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
441 },
442 },
443 {
444 .callback = video_set_bqc_offset,
445 .ident = "Acer Aspire 5315",
446 .matches = {
447 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
448 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
449 },
450 },
451 {
452 .callback = video_set_bqc_offset,
453 .ident = "Acer Aspire 7720",
454 .matches = {
455 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
456 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
457 },
458 },
459 {
460 .callback = video_ignore_initial_backlight,
461 .ident = "HP Folio 13-2000",
462 .matches = {
463 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
464 DMI_MATCH(DMI_PRODUCT_NAME, "HP Folio 13 - 2000 Notebook PC"),
465 },
466 },
467 {
468 .callback = video_ignore_initial_backlight,
469 .ident = "Fujitsu E753",
470 .matches = {
471 DMI_MATCH(DMI_BOARD_VENDOR, "FUJITSU"),
472 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E753"),
473 },
474 },
475 {
476 .callback = video_ignore_initial_backlight,
477 .ident = "HP Pavilion dm4",
478 .matches = {
479 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
480 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion dm4 Notebook PC"),
481 },
482 },
483 {
484 .callback = video_ignore_initial_backlight,
485 .ident = "HP Pavilion g6 Notebook PC",
486 .matches = {
487 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
488 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion g6 Notebook PC"),
489 },
490 },
491 {
492 .callback = video_ignore_initial_backlight,
493 .ident = "HP 1000 Notebook PC",
494 .matches = {
495 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
496 DMI_MATCH(DMI_PRODUCT_NAME, "HP 1000 Notebook PC"),
497 },
498 },
499 {
500 .callback = video_ignore_initial_backlight,
501 .ident = "HP Pavilion m4",
502 .matches = {
503 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
504 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion m4 Notebook PC"),
505 },
506 },
507 {}
508 };
509
510 static unsigned long long
511 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
512 unsigned long long bqc_value)
513 {
514 unsigned long long level;
515
516 if (device->brightness->flags._BQC_use_index) {
517 /*
518 * _BQC returns an index that doesn't account for
519 * the first 2 items with special meaning, so we need
520 * to compensate for that by offsetting ourselves
521 */
522 if (device->brightness->flags._BCL_reversed)
523 bqc_value = device->brightness->count - 3 - bqc_value;
524
525 level = device->brightness->levels[bqc_value + 2];
526 } else {
527 level = bqc_value;
528 }
529
530 level += bqc_offset_aml_bug_workaround;
531
532 return level;
533 }
534
535 static int
536 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
537 unsigned long long *level, bool raw)
538 {
539 acpi_status status = AE_OK;
540 int i;
541
542 if (device->cap._BQC || device->cap._BCQ) {
543 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
544
545 status = acpi_evaluate_integer(device->dev->handle, buf,
546 NULL, level);
547 if (ACPI_SUCCESS(status)) {
548 if (raw) {
549 /*
550 * Caller has indicated he wants the raw
551 * value returned by _BQC, so don't furtherly
552 * mess with the value.
553 */
554 return 0;
555 }
556
557 *level = acpi_video_bqc_value_to_level(device, *level);
558
559 for (i = 2; i < device->brightness->count; i++)
560 if (device->brightness->levels[i] == *level) {
561 device->brightness->curr = *level;
562 return 0;
563 }
564 /*
565 * BQC returned an invalid level.
566 * Stop using it.
567 */
568 ACPI_WARNING((AE_INFO,
569 "%s returned an invalid level",
570 buf));
571 device->cap._BQC = device->cap._BCQ = 0;
572 } else {
573 /*
574 * Fixme:
575 * should we return an error or ignore this failure?
576 * dev->brightness->curr is a cached value which stores
577 * the correct current backlight level in most cases.
578 * ACPI video backlight still works w/ buggy _BQC.
579 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
580 */
581 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
582 device->cap._BQC = device->cap._BCQ = 0;
583 }
584 }
585
586 *level = device->brightness->curr;
587 return 0;
588 }
589
590 static int
591 acpi_video_device_EDID(struct acpi_video_device *device,
592 union acpi_object **edid, ssize_t length)
593 {
594 int status;
595 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
596 union acpi_object *obj;
597 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
598 struct acpi_object_list args = { 1, &arg0 };
599
600
601 *edid = NULL;
602
603 if (!device)
604 return -ENODEV;
605 if (length == 128)
606 arg0.integer.value = 1;
607 else if (length == 256)
608 arg0.integer.value = 2;
609 else
610 return -EINVAL;
611
612 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
613 if (ACPI_FAILURE(status))
614 return -ENODEV;
615
616 obj = buffer.pointer;
617
618 if (obj && obj->type == ACPI_TYPE_BUFFER)
619 *edid = obj;
620 else {
621 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
622 status = -EFAULT;
623 kfree(obj);
624 }
625
626 return status;
627 }
628
629 /* bus */
630
631 /*
632 * Arg:
633 * video : video bus device pointer
634 * bios_flag :
635 * 0. The system BIOS should NOT automatically switch(toggle)
636 * the active display output.
637 * 1. The system BIOS should automatically switch (toggle) the
638 * active display output. No switch event.
639 * 2. The _DGS value should be locked.
640 * 3. The system BIOS should not automatically switch (toggle) the
641 * active display output, but instead generate the display switch
642 * event notify code.
643 * lcd_flag :
644 * 0. The system BIOS should automatically control the brightness level
645 * of the LCD when the power changes from AC to DC
646 * 1. The system BIOS should NOT automatically control the brightness
647 * level of the LCD when the power changes from AC to DC.
648 * Return Value:
649 * -EINVAL wrong arg.
650 */
651
652 static int
653 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
654 {
655 acpi_status status;
656
657 if (!video->cap._DOS)
658 return 0;
659
660 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
661 return -EINVAL;
662 video->dos_setting = (lcd_flag << 2) | bios_flag;
663 status = acpi_execute_simple_method(video->device->handle, "_DOS",
664 (lcd_flag << 2) | bios_flag);
665 if (ACPI_FAILURE(status))
666 return -EIO;
667
668 return 0;
669 }
670
671 /*
672 * Simple comparison function used to sort backlight levels.
673 */
674
675 static int
676 acpi_video_cmp_level(const void *a, const void *b)
677 {
678 return *(int *)a - *(int *)b;
679 }
680
681 /*
682 * Decides if _BQC/_BCQ for this system is usable
683 *
684 * We do this by changing the level first and then read out the current
685 * brightness level, if the value does not match, find out if it is using
686 * index. If not, clear the _BQC/_BCQ capability.
687 */
688 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
689 int max_level, int current_level)
690 {
691 struct acpi_video_device_brightness *br = device->brightness;
692 int result;
693 unsigned long long level;
694 int test_level;
695
696 /* don't mess with existing known broken systems */
697 if (bqc_offset_aml_bug_workaround)
698 return 0;
699
700 /*
701 * Some systems always report current brightness level as maximum
702 * through _BQC, we need to test another value for them.
703 */
704 test_level = current_level == max_level ? br->levels[3] : max_level;
705
706 result = acpi_video_device_lcd_set_level(device, test_level);
707 if (result)
708 return result;
709
710 result = acpi_video_device_lcd_get_level_current(device, &level, true);
711 if (result)
712 return result;
713
714 if (level != test_level) {
715 /* buggy _BQC found, need to find out if it uses index */
716 if (level < br->count) {
717 if (br->flags._BCL_reversed)
718 level = br->count - 3 - level;
719 if (br->levels[level + 2] == test_level)
720 br->flags._BQC_use_index = 1;
721 }
722
723 if (!br->flags._BQC_use_index)
724 device->cap._BQC = device->cap._BCQ = 0;
725 }
726
727 return 0;
728 }
729
730
731 /*
732 * Arg:
733 * device : video output device (LCD, CRT, ..)
734 *
735 * Return Value:
736 * Maximum brightness level
737 *
738 * Allocate and initialize device->brightness.
739 */
740
741 static int
742 acpi_video_init_brightness(struct acpi_video_device *device)
743 {
744 union acpi_object *obj = NULL;
745 int i, max_level = 0, count = 0, level_ac_battery = 0;
746 unsigned long long level, level_old;
747 union acpi_object *o;
748 struct acpi_video_device_brightness *br = NULL;
749 int result = -EINVAL;
750
751 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
752 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
753 "LCD brightness level\n"));
754 goto out;
755 }
756
757 if (obj->package.count < 2)
758 goto out;
759
760 br = kzalloc(sizeof(*br), GFP_KERNEL);
761 if (!br) {
762 printk(KERN_ERR "can't allocate memory\n");
763 result = -ENOMEM;
764 goto out;
765 }
766
767 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
768 GFP_KERNEL);
769 if (!br->levels) {
770 result = -ENOMEM;
771 goto out_free;
772 }
773
774 for (i = 0; i < obj->package.count; i++) {
775 o = (union acpi_object *)&obj->package.elements[i];
776 if (o->type != ACPI_TYPE_INTEGER) {
777 printk(KERN_ERR PREFIX "Invalid data\n");
778 continue;
779 }
780 br->levels[count] = (u32) o->integer.value;
781
782 if (br->levels[count] > max_level)
783 max_level = br->levels[count];
784 count++;
785 }
786
787 /*
788 * some buggy BIOS don't export the levels
789 * when machine is on AC/Battery in _BCL package.
790 * In this case, the first two elements in _BCL packages
791 * are also supported brightness levels that OS should take care of.
792 */
793 for (i = 2; i < count; i++) {
794 if (br->levels[i] == br->levels[0])
795 level_ac_battery++;
796 if (br->levels[i] == br->levels[1])
797 level_ac_battery++;
798 }
799
800 if (level_ac_battery < 2) {
801 level_ac_battery = 2 - level_ac_battery;
802 br->flags._BCL_no_ac_battery_levels = 1;
803 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
804 br->levels[i] = br->levels[i - level_ac_battery];
805 count += level_ac_battery;
806 } else if (level_ac_battery > 2)
807 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
808
809 /* Check if the _BCL package is in a reversed order */
810 if (max_level == br->levels[2]) {
811 br->flags._BCL_reversed = 1;
812 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
813 acpi_video_cmp_level, NULL);
814 } else if (max_level != br->levels[count - 1])
815 ACPI_ERROR((AE_INFO,
816 "Found unordered _BCL package"));
817
818 br->count = count;
819 device->brightness = br;
820
821 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
822 br->curr = level = max_level;
823
824 if (!device->cap._BQC)
825 goto set_level;
826
827 result = acpi_video_device_lcd_get_level_current(device,
828 &level_old, true);
829 if (result)
830 goto out_free_levels;
831
832 result = acpi_video_bqc_quirk(device, max_level, level_old);
833 if (result)
834 goto out_free_levels;
835 /*
836 * cap._BQC may get cleared due to _BQC is found to be broken
837 * in acpi_video_bqc_quirk, so check again here.
838 */
839 if (!device->cap._BQC)
840 goto set_level;
841
842 if (use_bios_initial_backlight) {
843 level = acpi_video_bqc_value_to_level(device, level_old);
844 /*
845 * On some buggy laptops, _BQC returns an uninitialized
846 * value when invoked for the first time, i.e.
847 * level_old is invalid (no matter whether it's a level
848 * or an index). Set the backlight to max_level in this case.
849 */
850 for (i = 2; i < br->count; i++)
851 if (level == br->levels[i])
852 break;
853 if (i == br->count || !level)
854 level = max_level;
855 }
856
857 set_level:
858 result = acpi_video_device_lcd_set_level(device, level);
859 if (result)
860 goto out_free_levels;
861
862 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
863 "found %d brightness levels\n", count - 2));
864 kfree(obj);
865 return result;
866
867 out_free_levels:
868 kfree(br->levels);
869 out_free:
870 kfree(br);
871 out:
872 device->brightness = NULL;
873 kfree(obj);
874 return result;
875 }
876
877 /*
878 * Arg:
879 * device : video output device (LCD, CRT, ..)
880 *
881 * Return Value:
882 * None
883 *
884 * Find out all required AML methods defined under the output
885 * device.
886 */
887
888 static void acpi_video_device_find_cap(struct acpi_video_device *device)
889 {
890 if (acpi_has_method(device->dev->handle, "_ADR"))
891 device->cap._ADR = 1;
892 if (acpi_has_method(device->dev->handle, "_BCL"))
893 device->cap._BCL = 1;
894 if (acpi_has_method(device->dev->handle, "_BCM"))
895 device->cap._BCM = 1;
896 if (acpi_has_method(device->dev->handle, "_BQC")) {
897 device->cap._BQC = 1;
898 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
899 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
900 device->cap._BCQ = 1;
901 }
902
903 if (acpi_has_method(device->dev->handle, "_DDC"))
904 device->cap._DDC = 1;
905 }
906
907 /*
908 * Arg:
909 * device : video output device (VGA)
910 *
911 * Return Value:
912 * None
913 *
914 * Find out all required AML methods defined under the video bus device.
915 */
916
917 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
918 {
919 if (acpi_has_method(video->device->handle, "_DOS"))
920 video->cap._DOS = 1;
921 if (acpi_has_method(video->device->handle, "_DOD"))
922 video->cap._DOD = 1;
923 if (acpi_has_method(video->device->handle, "_ROM"))
924 video->cap._ROM = 1;
925 if (acpi_has_method(video->device->handle, "_GPD"))
926 video->cap._GPD = 1;
927 if (acpi_has_method(video->device->handle, "_SPD"))
928 video->cap._SPD = 1;
929 if (acpi_has_method(video->device->handle, "_VPO"))
930 video->cap._VPO = 1;
931 }
932
933 /*
934 * Check whether the video bus device has required AML method to
935 * support the desired features
936 */
937
938 static int acpi_video_bus_check(struct acpi_video_bus *video)
939 {
940 acpi_status status = -ENOENT;
941 struct pci_dev *dev;
942
943 if (!video)
944 return -EINVAL;
945
946 dev = acpi_get_pci_dev(video->device->handle);
947 if (!dev)
948 return -ENODEV;
949 pci_dev_put(dev);
950
951 /*
952 * Since there is no HID, CID and so on for VGA driver, we have
953 * to check well known required nodes.
954 */
955
956 /* Does this device support video switching? */
957 if (video->cap._DOS || video->cap._DOD) {
958 if (!video->cap._DOS) {
959 printk(KERN_WARNING FW_BUG
960 "ACPI(%s) defines _DOD but not _DOS\n",
961 acpi_device_bid(video->device));
962 }
963 video->flags.multihead = 1;
964 status = 0;
965 }
966
967 /* Does this device support retrieving a video ROM? */
968 if (video->cap._ROM) {
969 video->flags.rom = 1;
970 status = 0;
971 }
972
973 /* Does this device support configuring which video device to POST? */
974 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
975 video->flags.post = 1;
976 status = 0;
977 }
978
979 return status;
980 }
981
982 /*
983 * --------------------------------------------------------------------------
984 * Driver Interface
985 * --------------------------------------------------------------------------
986 */
987
988 /* device interface */
989 static struct acpi_video_device_attrib *
990 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
991 {
992 struct acpi_video_enumerated_device *ids;
993 int i;
994
995 for (i = 0; i < video->attached_count; i++) {
996 ids = &video->attached_array[i];
997 if ((ids->value.int_val & 0xffff) == device_id)
998 return &ids->value.attrib;
999 }
1000
1001 return NULL;
1002 }
1003
1004 static int
1005 acpi_video_get_device_type(struct acpi_video_bus *video,
1006 unsigned long device_id)
1007 {
1008 struct acpi_video_enumerated_device *ids;
1009 int i;
1010
1011 for (i = 0; i < video->attached_count; i++) {
1012 ids = &video->attached_array[i];
1013 if ((ids->value.int_val & 0xffff) == device_id)
1014 return ids->value.int_val;
1015 }
1016
1017 return 0;
1018 }
1019
1020 static int
1021 acpi_video_bus_get_one_device(struct acpi_device *device,
1022 struct acpi_video_bus *video)
1023 {
1024 unsigned long long device_id;
1025 int status, device_type;
1026 struct acpi_video_device *data;
1027 struct acpi_video_device_attrib *attribute;
1028
1029 status =
1030 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1031 /* Some device omits _ADR, we skip them instead of fail */
1032 if (ACPI_FAILURE(status))
1033 return 0;
1034
1035 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1036 if (!data)
1037 return -ENOMEM;
1038
1039 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1040 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1041 device->driver_data = data;
1042
1043 data->device_id = device_id;
1044 data->video = video;
1045 data->dev = device;
1046
1047 attribute = acpi_video_get_device_attr(video, device_id);
1048
1049 if (attribute && attribute->device_id_scheme) {
1050 switch (attribute->display_type) {
1051 case ACPI_VIDEO_DISPLAY_CRT:
1052 data->flags.crt = 1;
1053 break;
1054 case ACPI_VIDEO_DISPLAY_TV:
1055 data->flags.tvout = 1;
1056 break;
1057 case ACPI_VIDEO_DISPLAY_DVI:
1058 data->flags.dvi = 1;
1059 break;
1060 case ACPI_VIDEO_DISPLAY_LCD:
1061 data->flags.lcd = 1;
1062 break;
1063 default:
1064 data->flags.unknown = 1;
1065 break;
1066 }
1067 if (attribute->bios_can_detect)
1068 data->flags.bios = 1;
1069 } else {
1070 /* Check for legacy IDs */
1071 device_type = acpi_video_get_device_type(video, device_id);
1072 /* Ignore bits 16 and 18-20 */
1073 switch (device_type & 0xffe2ffff) {
1074 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1075 data->flags.crt = 1;
1076 break;
1077 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1078 data->flags.lcd = 1;
1079 break;
1080 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1081 data->flags.tvout = 1;
1082 break;
1083 default:
1084 data->flags.unknown = 1;
1085 }
1086 }
1087
1088 acpi_video_device_bind(video, data);
1089 acpi_video_device_find_cap(data);
1090
1091 mutex_lock(&video->device_list_lock);
1092 list_add_tail(&data->entry, &video->video_device_list);
1093 mutex_unlock(&video->device_list_lock);
1094
1095 return status;
1096 }
1097
1098 /*
1099 * Arg:
1100 * video : video bus device
1101 *
1102 * Return:
1103 * none
1104 *
1105 * Enumerate the video device list of the video bus,
1106 * bind the ids with the corresponding video devices
1107 * under the video bus.
1108 */
1109
1110 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1111 {
1112 struct acpi_video_device *dev;
1113
1114 mutex_lock(&video->device_list_lock);
1115
1116 list_for_each_entry(dev, &video->video_device_list, entry)
1117 acpi_video_device_bind(video, dev);
1118
1119 mutex_unlock(&video->device_list_lock);
1120 }
1121
1122 /*
1123 * Arg:
1124 * video : video bus device
1125 * device : video output device under the video
1126 * bus
1127 *
1128 * Return:
1129 * none
1130 *
1131 * Bind the ids with the corresponding video devices
1132 * under the video bus.
1133 */
1134
1135 static void
1136 acpi_video_device_bind(struct acpi_video_bus *video,
1137 struct acpi_video_device *device)
1138 {
1139 struct acpi_video_enumerated_device *ids;
1140 int i;
1141
1142 for (i = 0; i < video->attached_count; i++) {
1143 ids = &video->attached_array[i];
1144 if (device->device_id == (ids->value.int_val & 0xffff)) {
1145 ids->bind_info = device;
1146 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1147 }
1148 }
1149 }
1150
1151 /*
1152 * Arg:
1153 * video : video bus device
1154 *
1155 * Return:
1156 * < 0 : error
1157 *
1158 * Call _DOD to enumerate all devices attached to display adapter
1159 *
1160 */
1161
1162 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1163 {
1164 int status;
1165 int count;
1166 int i;
1167 struct acpi_video_enumerated_device *active_list;
1168 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1169 union acpi_object *dod = NULL;
1170 union acpi_object *obj;
1171
1172 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1173 if (!ACPI_SUCCESS(status)) {
1174 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1175 return status;
1176 }
1177
1178 dod = buffer.pointer;
1179 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1180 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1181 status = -EFAULT;
1182 goto out;
1183 }
1184
1185 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1186 dod->package.count));
1187
1188 active_list = kcalloc(1 + dod->package.count,
1189 sizeof(struct acpi_video_enumerated_device),
1190 GFP_KERNEL);
1191 if (!active_list) {
1192 status = -ENOMEM;
1193 goto out;
1194 }
1195
1196 count = 0;
1197 for (i = 0; i < dod->package.count; i++) {
1198 obj = &dod->package.elements[i];
1199
1200 if (obj->type != ACPI_TYPE_INTEGER) {
1201 printk(KERN_ERR PREFIX
1202 "Invalid _DOD data in element %d\n", i);
1203 continue;
1204 }
1205
1206 active_list[count].value.int_val = obj->integer.value;
1207 active_list[count].bind_info = NULL;
1208 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1209 (int)obj->integer.value));
1210 count++;
1211 }
1212
1213 kfree(video->attached_array);
1214
1215 video->attached_array = active_list;
1216 video->attached_count = count;
1217
1218 out:
1219 kfree(buffer.pointer);
1220 return status;
1221 }
1222
1223 static int
1224 acpi_video_get_next_level(struct acpi_video_device *device,
1225 u32 level_current, u32 event)
1226 {
1227 int min, max, min_above, max_below, i, l, delta = 255;
1228 max = max_below = 0;
1229 min = min_above = 255;
1230 /* Find closest level to level_current */
1231 for (i = 2; i < device->brightness->count; i++) {
1232 l = device->brightness->levels[i];
1233 if (abs(l - level_current) < abs(delta)) {
1234 delta = l - level_current;
1235 if (!delta)
1236 break;
1237 }
1238 }
1239 /* Ajust level_current to closest available level */
1240 level_current += delta;
1241 for (i = 2; i < device->brightness->count; i++) {
1242 l = device->brightness->levels[i];
1243 if (l < min)
1244 min = l;
1245 if (l > max)
1246 max = l;
1247 if (l < min_above && l > level_current)
1248 min_above = l;
1249 if (l > max_below && l < level_current)
1250 max_below = l;
1251 }
1252
1253 switch (event) {
1254 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1255 return (level_current < max) ? min_above : min;
1256 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1257 return (level_current < max) ? min_above : max;
1258 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1259 return (level_current > min) ? max_below : min;
1260 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1261 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1262 return 0;
1263 default:
1264 return level_current;
1265 }
1266 }
1267
1268 static int
1269 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1270 {
1271 unsigned long long level_current, level_next;
1272 int result = -EINVAL;
1273
1274 /* no warning message if acpi_backlight=vendor or a quirk is used */
1275 if (!acpi_video_verify_backlight_support())
1276 return 0;
1277
1278 if (!device->brightness)
1279 goto out;
1280
1281 result = acpi_video_device_lcd_get_level_current(device,
1282 &level_current,
1283 false);
1284 if (result)
1285 goto out;
1286
1287 level_next = acpi_video_get_next_level(device, level_current, event);
1288
1289 result = acpi_video_device_lcd_set_level(device, level_next);
1290
1291 if (!result)
1292 backlight_force_update(device->backlight,
1293 BACKLIGHT_UPDATE_HOTKEY);
1294
1295 out:
1296 if (result)
1297 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1298
1299 return result;
1300 }
1301
1302 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1303 void **edid)
1304 {
1305 struct acpi_video_bus *video;
1306 struct acpi_video_device *video_device;
1307 union acpi_object *buffer = NULL;
1308 acpi_status status;
1309 int i, length;
1310
1311 if (!device || !acpi_driver_data(device))
1312 return -EINVAL;
1313
1314 video = acpi_driver_data(device);
1315
1316 for (i = 0; i < video->attached_count; i++) {
1317 video_device = video->attached_array[i].bind_info;
1318 length = 256;
1319
1320 if (!video_device)
1321 continue;
1322
1323 if (!video_device->cap._DDC)
1324 continue;
1325
1326 if (type) {
1327 switch (type) {
1328 case ACPI_VIDEO_DISPLAY_CRT:
1329 if (!video_device->flags.crt)
1330 continue;
1331 break;
1332 case ACPI_VIDEO_DISPLAY_TV:
1333 if (!video_device->flags.tvout)
1334 continue;
1335 break;
1336 case ACPI_VIDEO_DISPLAY_DVI:
1337 if (!video_device->flags.dvi)
1338 continue;
1339 break;
1340 case ACPI_VIDEO_DISPLAY_LCD:
1341 if (!video_device->flags.lcd)
1342 continue;
1343 break;
1344 }
1345 } else if (video_device->device_id != device_id) {
1346 continue;
1347 }
1348
1349 status = acpi_video_device_EDID(video_device, &buffer, length);
1350
1351 if (ACPI_FAILURE(status) || !buffer ||
1352 buffer->type != ACPI_TYPE_BUFFER) {
1353 length = 128;
1354 status = acpi_video_device_EDID(video_device, &buffer,
1355 length);
1356 if (ACPI_FAILURE(status) || !buffer ||
1357 buffer->type != ACPI_TYPE_BUFFER) {
1358 continue;
1359 }
1360 }
1361
1362 *edid = buffer->buffer.pointer;
1363 return length;
1364 }
1365
1366 return -ENODEV;
1367 }
1368 EXPORT_SYMBOL(acpi_video_get_edid);
1369
1370 static int
1371 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1372 struct acpi_device *device)
1373 {
1374 int status = 0;
1375 struct acpi_device *dev;
1376
1377 /*
1378 * There are systems where video module known to work fine regardless
1379 * of broken _DOD and ignoring returned value here doesn't cause
1380 * any issues later.
1381 */
1382 acpi_video_device_enumerate(video);
1383
1384 list_for_each_entry(dev, &device->children, node) {
1385
1386 status = acpi_video_bus_get_one_device(dev, video);
1387 if (status) {
1388 dev_err(&dev->dev, "Can't attach device\n");
1389 break;
1390 }
1391 }
1392 return status;
1393 }
1394
1395 /* acpi_video interface */
1396
1397 /*
1398 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1399 * preform any automatic brightness change on receiving a notification.
1400 */
1401 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1402 {
1403 return acpi_video_bus_DOS(video, 0,
1404 acpi_osi_is_win8() ? 1 : 0);
1405 }
1406
1407 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1408 {
1409 return acpi_video_bus_DOS(video, 0,
1410 acpi_osi_is_win8() ? 0 : 1);
1411 }
1412
1413 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1414 {
1415 struct acpi_video_bus *video = acpi_driver_data(device);
1416 struct input_dev *input;
1417 int keycode = 0;
1418
1419 if (!video || !video->input)
1420 return;
1421
1422 input = video->input;
1423
1424 switch (event) {
1425 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1426 * most likely via hotkey. */
1427 keycode = KEY_SWITCHVIDEOMODE;
1428 break;
1429
1430 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1431 * connector. */
1432 acpi_video_device_enumerate(video);
1433 acpi_video_device_rebind(video);
1434 keycode = KEY_SWITCHVIDEOMODE;
1435 break;
1436
1437 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1438 keycode = KEY_SWITCHVIDEOMODE;
1439 break;
1440 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1441 keycode = KEY_VIDEO_NEXT;
1442 break;
1443 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1444 keycode = KEY_VIDEO_PREV;
1445 break;
1446
1447 default:
1448 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1449 "Unsupported event [0x%x]\n", event));
1450 break;
1451 }
1452
1453 if (acpi_notifier_call_chain(device, event, 0))
1454 /* Something vetoed the keypress. */
1455 keycode = 0;
1456
1457 if (keycode) {
1458 input_report_key(input, keycode, 1);
1459 input_sync(input);
1460 input_report_key(input, keycode, 0);
1461 input_sync(input);
1462 }
1463
1464 return;
1465 }
1466
1467 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1468 {
1469 struct acpi_video_device *video_device = data;
1470 struct acpi_device *device = NULL;
1471 struct acpi_video_bus *bus;
1472 struct input_dev *input;
1473 int keycode = 0;
1474
1475 if (!video_device)
1476 return;
1477
1478 device = video_device->dev;
1479 bus = video_device->video;
1480 input = bus->input;
1481
1482 switch (event) {
1483 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1484 if (brightness_switch_enabled)
1485 acpi_video_switch_brightness(video_device, event);
1486 keycode = KEY_BRIGHTNESS_CYCLE;
1487 break;
1488 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1489 if (brightness_switch_enabled)
1490 acpi_video_switch_brightness(video_device, event);
1491 keycode = KEY_BRIGHTNESSUP;
1492 break;
1493 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1494 if (brightness_switch_enabled)
1495 acpi_video_switch_brightness(video_device, event);
1496 keycode = KEY_BRIGHTNESSDOWN;
1497 break;
1498 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1499 if (brightness_switch_enabled)
1500 acpi_video_switch_brightness(video_device, event);
1501 keycode = KEY_BRIGHTNESS_ZERO;
1502 break;
1503 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1504 if (brightness_switch_enabled)
1505 acpi_video_switch_brightness(video_device, event);
1506 keycode = KEY_DISPLAY_OFF;
1507 break;
1508 default:
1509 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1510 "Unsupported event [0x%x]\n", event));
1511 break;
1512 }
1513
1514 acpi_notifier_call_chain(device, event, 0);
1515
1516 if (keycode) {
1517 input_report_key(input, keycode, 1);
1518 input_sync(input);
1519 input_report_key(input, keycode, 0);
1520 input_sync(input);
1521 }
1522
1523 return;
1524 }
1525
1526 static int acpi_video_resume(struct notifier_block *nb,
1527 unsigned long val, void *ign)
1528 {
1529 struct acpi_video_bus *video;
1530 struct acpi_video_device *video_device;
1531 int i;
1532
1533 switch (val) {
1534 case PM_HIBERNATION_PREPARE:
1535 case PM_SUSPEND_PREPARE:
1536 case PM_RESTORE_PREPARE:
1537 return NOTIFY_DONE;
1538 }
1539
1540 video = container_of(nb, struct acpi_video_bus, pm_nb);
1541
1542 dev_info(&video->device->dev, "Restoring backlight state\n");
1543
1544 for (i = 0; i < video->attached_count; i++) {
1545 video_device = video->attached_array[i].bind_info;
1546 if (video_device && video_device->backlight)
1547 acpi_video_set_brightness(video_device->backlight);
1548 }
1549
1550 return NOTIFY_OK;
1551 }
1552
1553 static acpi_status
1554 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1555 void **return_value)
1556 {
1557 struct acpi_device *device = context;
1558 struct acpi_device *sibling;
1559 int result;
1560
1561 if (handle == device->handle)
1562 return AE_CTRL_TERMINATE;
1563
1564 result = acpi_bus_get_device(handle, &sibling);
1565 if (result)
1566 return AE_OK;
1567
1568 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1569 return AE_ALREADY_EXISTS;
1570
1571 return AE_OK;
1572 }
1573
1574 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1575 {
1576 if (acpi_video_verify_backlight_support()) {
1577 struct backlight_properties props;
1578 struct pci_dev *pdev;
1579 acpi_handle acpi_parent;
1580 struct device *parent = NULL;
1581 int result;
1582 static int count;
1583 char *name;
1584
1585 result = acpi_video_init_brightness(device);
1586 if (result)
1587 return;
1588 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1589 if (!name)
1590 return;
1591 count++;
1592
1593 acpi_get_parent(device->dev->handle, &acpi_parent);
1594
1595 pdev = acpi_get_pci_dev(acpi_parent);
1596 if (pdev) {
1597 parent = &pdev->dev;
1598 pci_dev_put(pdev);
1599 }
1600
1601 memset(&props, 0, sizeof(struct backlight_properties));
1602 props.type = BACKLIGHT_FIRMWARE;
1603 props.max_brightness = device->brightness->count - 3;
1604 device->backlight = backlight_device_register(name,
1605 parent,
1606 device,
1607 &acpi_backlight_ops,
1608 &props);
1609 kfree(name);
1610 if (IS_ERR(device->backlight))
1611 return;
1612
1613 /*
1614 * Save current brightness level in case we have to restore it
1615 * before acpi_video_device_lcd_set_level() is called next time.
1616 */
1617 device->backlight->props.brightness =
1618 acpi_video_get_brightness(device->backlight);
1619
1620 device->cooling_dev = thermal_cooling_device_register("LCD",
1621 device->dev, &video_cooling_ops);
1622 if (IS_ERR(device->cooling_dev)) {
1623 /*
1624 * Set cooling_dev to NULL so we don't crash trying to
1625 * free it.
1626 * Also, why the hell we are returning early and
1627 * not attempt to register video output if cooling
1628 * device registration failed?
1629 * -- dtor
1630 */
1631 device->cooling_dev = NULL;
1632 return;
1633 }
1634
1635 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1636 device->cooling_dev->id);
1637 result = sysfs_create_link(&device->dev->dev.kobj,
1638 &device->cooling_dev->device.kobj,
1639 "thermal_cooling");
1640 if (result)
1641 printk(KERN_ERR PREFIX "Create sysfs link\n");
1642 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1643 &device->dev->dev.kobj, "device");
1644 if (result)
1645 printk(KERN_ERR PREFIX "Create sysfs link\n");
1646 }
1647 }
1648
1649 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1650 {
1651 struct acpi_video_device *dev;
1652
1653 mutex_lock(&video->device_list_lock);
1654 list_for_each_entry(dev, &video->video_device_list, entry)
1655 acpi_video_dev_register_backlight(dev);
1656 mutex_unlock(&video->device_list_lock);
1657
1658 video->pm_nb.notifier_call = acpi_video_resume;
1659 video->pm_nb.priority = 0;
1660 return register_pm_notifier(&video->pm_nb);
1661 }
1662
1663 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1664 {
1665 if (device->backlight) {
1666 backlight_device_unregister(device->backlight);
1667 device->backlight = NULL;
1668 }
1669 if (device->brightness) {
1670 kfree(device->brightness->levels);
1671 kfree(device->brightness);
1672 device->brightness = NULL;
1673 }
1674 if (device->cooling_dev) {
1675 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1676 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1677 thermal_cooling_device_unregister(device->cooling_dev);
1678 device->cooling_dev = NULL;
1679 }
1680 }
1681
1682 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1683 {
1684 struct acpi_video_device *dev;
1685 int error = unregister_pm_notifier(&video->pm_nb);
1686
1687 mutex_lock(&video->device_list_lock);
1688 list_for_each_entry(dev, &video->video_device_list, entry)
1689 acpi_video_dev_unregister_backlight(dev);
1690 mutex_unlock(&video->device_list_lock);
1691
1692 return error;
1693 }
1694
1695 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1696 {
1697 acpi_status status;
1698 struct acpi_device *adev = device->dev;
1699
1700 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1701 acpi_video_device_notify, device);
1702 if (ACPI_FAILURE(status))
1703 dev_err(&adev->dev, "Error installing notify handler\n");
1704 else
1705 device->flags.notify = 1;
1706 }
1707
1708 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1709 {
1710 struct input_dev *input;
1711 struct acpi_video_device *dev;
1712 int error;
1713
1714 video->input = input = input_allocate_device();
1715 if (!input) {
1716 error = -ENOMEM;
1717 goto out;
1718 }
1719
1720 error = acpi_video_bus_start_devices(video);
1721 if (error)
1722 goto err_free_input;
1723
1724 snprintf(video->phys, sizeof(video->phys),
1725 "%s/video/input0", acpi_device_hid(video->device));
1726
1727 input->name = acpi_device_name(video->device);
1728 input->phys = video->phys;
1729 input->id.bustype = BUS_HOST;
1730 input->id.product = 0x06;
1731 input->dev.parent = &video->device->dev;
1732 input->evbit[0] = BIT(EV_KEY);
1733 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1734 set_bit(KEY_VIDEO_NEXT, input->keybit);
1735 set_bit(KEY_VIDEO_PREV, input->keybit);
1736 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1737 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1738 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1739 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1740 set_bit(KEY_DISPLAY_OFF, input->keybit);
1741
1742 error = input_register_device(input);
1743 if (error)
1744 goto err_stop_dev;
1745
1746 mutex_lock(&video->device_list_lock);
1747 list_for_each_entry(dev, &video->video_device_list, entry)
1748 acpi_video_dev_add_notify_handler(dev);
1749 mutex_unlock(&video->device_list_lock);
1750
1751 return 0;
1752
1753 err_stop_dev:
1754 acpi_video_bus_stop_devices(video);
1755 err_free_input:
1756 input_free_device(input);
1757 video->input = NULL;
1758 out:
1759 return error;
1760 }
1761
1762 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1763 {
1764 if (dev->flags.notify) {
1765 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1766 acpi_video_device_notify);
1767 dev->flags.notify = 0;
1768 }
1769 }
1770
1771 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1772 {
1773 struct acpi_video_device *dev;
1774
1775 mutex_lock(&video->device_list_lock);
1776 list_for_each_entry(dev, &video->video_device_list, entry)
1777 acpi_video_dev_remove_notify_handler(dev);
1778 mutex_unlock(&video->device_list_lock);
1779
1780 acpi_video_bus_stop_devices(video);
1781 input_unregister_device(video->input);
1782 video->input = NULL;
1783 }
1784
1785 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1786 {
1787 struct acpi_video_device *dev, *next;
1788
1789 mutex_lock(&video->device_list_lock);
1790 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1791 list_del(&dev->entry);
1792 kfree(dev);
1793 }
1794 mutex_unlock(&video->device_list_lock);
1795
1796 return 0;
1797 }
1798
1799 static int instance;
1800
1801 static int acpi_video_bus_add(struct acpi_device *device)
1802 {
1803 struct acpi_video_bus *video;
1804 int error;
1805 acpi_status status;
1806
1807 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1808 device->parent->handle, 1,
1809 acpi_video_bus_match, NULL,
1810 device, NULL);
1811 if (status == AE_ALREADY_EXISTS) {
1812 printk(KERN_WARNING FW_BUG
1813 "Duplicate ACPI video bus devices for the"
1814 " same VGA controller, please try module "
1815 "parameter \"video.allow_duplicates=1\""
1816 "if the current driver doesn't work.\n");
1817 if (!allow_duplicates)
1818 return -ENODEV;
1819 }
1820
1821 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1822 if (!video)
1823 return -ENOMEM;
1824
1825 /* a hack to fix the duplicate name "VID" problem on T61 */
1826 if (!strcmp(device->pnp.bus_id, "VID")) {
1827 if (instance)
1828 device->pnp.bus_id[3] = '0' + instance;
1829 instance++;
1830 }
1831 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1832 if (!strcmp(device->pnp.bus_id, "VGA")) {
1833 if (instance)
1834 device->pnp.bus_id[3] = '0' + instance;
1835 instance++;
1836 }
1837
1838 video->device = device;
1839 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1840 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1841 device->driver_data = video;
1842
1843 acpi_video_bus_find_cap(video);
1844 error = acpi_video_bus_check(video);
1845 if (error)
1846 goto err_free_video;
1847
1848 mutex_init(&video->device_list_lock);
1849 INIT_LIST_HEAD(&video->video_device_list);
1850
1851 error = acpi_video_bus_get_devices(video, device);
1852 if (error)
1853 goto err_put_video;
1854
1855 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
1856 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1857 video->flags.multihead ? "yes" : "no",
1858 video->flags.rom ? "yes" : "no",
1859 video->flags.post ? "yes" : "no");
1860 mutex_lock(&video_list_lock);
1861 list_add_tail(&video->entry, &video_bus_head);
1862 mutex_unlock(&video_list_lock);
1863
1864 acpi_video_bus_register_backlight(video);
1865 acpi_video_bus_add_notify_handler(video);
1866
1867 return 0;
1868
1869 err_put_video:
1870 acpi_video_bus_put_devices(video);
1871 kfree(video->attached_array);
1872 err_free_video:
1873 kfree(video);
1874 device->driver_data = NULL;
1875
1876 return error;
1877 }
1878
1879 static int acpi_video_bus_remove(struct acpi_device *device)
1880 {
1881 struct acpi_video_bus *video = NULL;
1882
1883
1884 if (!device || !acpi_driver_data(device))
1885 return -EINVAL;
1886
1887 video = acpi_driver_data(device);
1888
1889 acpi_video_bus_remove_notify_handler(video);
1890 acpi_video_bus_unregister_backlight(video);
1891 acpi_video_bus_put_devices(video);
1892
1893 mutex_lock(&video_list_lock);
1894 list_del(&video->entry);
1895 mutex_unlock(&video_list_lock);
1896
1897 kfree(video->attached_array);
1898 kfree(video);
1899
1900 return 0;
1901 }
1902
1903 static int __init is_i740(struct pci_dev *dev)
1904 {
1905 if (dev->device == 0x00D1)
1906 return 1;
1907 if (dev->device == 0x7000)
1908 return 1;
1909 return 0;
1910 }
1911
1912 static int __init intel_opregion_present(void)
1913 {
1914 int opregion = 0;
1915 struct pci_dev *dev = NULL;
1916 u32 address;
1917
1918 for_each_pci_dev(dev) {
1919 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1920 continue;
1921 if (dev->vendor != PCI_VENDOR_ID_INTEL)
1922 continue;
1923 /* We don't want to poke around undefined i740 registers */
1924 if (is_i740(dev))
1925 continue;
1926 pci_read_config_dword(dev, 0xfc, &address);
1927 if (!address)
1928 continue;
1929 opregion = 1;
1930 }
1931 return opregion;
1932 }
1933
1934 int acpi_video_register(void)
1935 {
1936 int result = 0;
1937 if (register_count) {
1938 /*
1939 * if the function of acpi_video_register is already called,
1940 * don't register the acpi_vide_bus again and return no error.
1941 */
1942 return 0;
1943 }
1944
1945 mutex_init(&video_list_lock);
1946 INIT_LIST_HEAD(&video_bus_head);
1947
1948 result = acpi_bus_register_driver(&acpi_video_bus);
1949 if (result < 0)
1950 return -ENODEV;
1951
1952 /*
1953 * When the acpi_video_bus is loaded successfully, increase
1954 * the counter reference.
1955 */
1956 register_count = 1;
1957
1958 return 0;
1959 }
1960 EXPORT_SYMBOL(acpi_video_register);
1961
1962 void acpi_video_unregister(void)
1963 {
1964 if (!register_count) {
1965 /*
1966 * If the acpi video bus is already unloaded, don't
1967 * unload it again and return directly.
1968 */
1969 return;
1970 }
1971 acpi_bus_unregister_driver(&acpi_video_bus);
1972
1973 register_count = 0;
1974
1975 return;
1976 }
1977 EXPORT_SYMBOL(acpi_video_unregister);
1978
1979 /*
1980 * This is kind of nasty. Hardware using Intel chipsets may require
1981 * the video opregion code to be run first in order to initialise
1982 * state before any ACPI video calls are made. To handle this we defer
1983 * registration of the video class until the opregion code has run.
1984 */
1985
1986 static int __init acpi_video_init(void)
1987 {
1988 dmi_check_system(video_dmi_table);
1989
1990 if (intel_opregion_present())
1991 return 0;
1992
1993 return acpi_video_register();
1994 }
1995
1996 static void __exit acpi_video_exit(void)
1997 {
1998 acpi_video_unregister();
1999
2000 return;
2001 }
2002
2003 module_init(acpi_video_init);
2004 module_exit(acpi_video_exit);
Linux kernel - Deliverables
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