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Merge tag 'iwlwifi-for-john-2014-10-23' of git://git.kernel.org/pub/scm/linux/kernel...
[mirror_ubuntu-zesty-kernel.git] / drivers / acpi / video.c
1 /*
2 * video.c - ACPI Video Driver
3 *
4 * Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
5 * Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
6 * Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
7 *
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or (at
13 * your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
23 *
24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25 */
26
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/types.h>
31 #include <linux/list.h>
32 #include <linux/mutex.h>
33 #include <linux/input.h>
34 #include <linux/backlight.h>
35 #include <linux/thermal.h>
36 #include <linux/sort.h>
37 #include <linux/pci.h>
38 #include <linux/pci_ids.h>
39 #include <linux/slab.h>
40 #include <linux/dmi.h>
41 #include <linux/suspend.h>
42 #include <linux/acpi.h>
43 #include <acpi/video.h>
44 #include <asm/uaccess.h>
45
46 #include "internal.h"
47
48 #define ACPI_VIDEO_BUS_NAME "Video Bus"
49 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
50 #define ACPI_VIDEO_NOTIFY_SWITCH 0x80
51 #define ACPI_VIDEO_NOTIFY_PROBE 0x81
52 #define ACPI_VIDEO_NOTIFY_CYCLE 0x82
53 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
54 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
55
56 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
57 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
58 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
59 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
60 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
61
62 #define MAX_NAME_LEN 20
63
64 #define _COMPONENT ACPI_VIDEO_COMPONENT
65 ACPI_MODULE_NAME("video");
66
67 MODULE_AUTHOR("Bruno Ducrot");
68 MODULE_DESCRIPTION("ACPI Video Driver");
69 MODULE_LICENSE("GPL");
70
71 static bool brightness_switch_enabled = 1;
72 module_param(brightness_switch_enabled, bool, 0644);
73
74 /*
75 * By default, we don't allow duplicate ACPI video bus devices
76 * under the same VGA controller
77 */
78 static bool allow_duplicates;
79 module_param(allow_duplicates, bool, 0644);
80
81 /*
82 * For Windows 8 systems: used to decide if video module
83 * should skip registering backlight interface of its own.
84 */
85 static int use_native_backlight_param = -1;
86 module_param_named(use_native_backlight, use_native_backlight_param, int, 0444);
87 static bool use_native_backlight_dmi = true;
88
89 static int register_count;
90 static struct mutex video_list_lock;
91 static struct list_head video_bus_head;
92 static int acpi_video_bus_add(struct acpi_device *device);
93 static int acpi_video_bus_remove(struct acpi_device *device);
94 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
95
96 static const struct acpi_device_id video_device_ids[] = {
97 {ACPI_VIDEO_HID, 0},
98 {"", 0},
99 };
100 MODULE_DEVICE_TABLE(acpi, video_device_ids);
101
102 static struct acpi_driver acpi_video_bus = {
103 .name = "video",
104 .class = ACPI_VIDEO_CLASS,
105 .ids = video_device_ids,
106 .ops = {
107 .add = acpi_video_bus_add,
108 .remove = acpi_video_bus_remove,
109 .notify = acpi_video_bus_notify,
110 },
111 };
112
113 struct acpi_video_bus_flags {
114 u8 multihead:1; /* can switch video heads */
115 u8 rom:1; /* can retrieve a video rom */
116 u8 post:1; /* can configure the head to */
117 u8 reserved:5;
118 };
119
120 struct acpi_video_bus_cap {
121 u8 _DOS:1; /* Enable/Disable output switching */
122 u8 _DOD:1; /* Enumerate all devices attached to display adapter */
123 u8 _ROM:1; /* Get ROM Data */
124 u8 _GPD:1; /* Get POST Device */
125 u8 _SPD:1; /* Set POST Device */
126 u8 _VPO:1; /* Video POST Options */
127 u8 reserved:2;
128 };
129
130 struct acpi_video_device_attrib {
131 u32 display_index:4; /* A zero-based instance of the Display */
132 u32 display_port_attachment:4; /* This field differentiates the display type */
133 u32 display_type:4; /* Describe the specific type in use */
134 u32 vendor_specific:4; /* Chipset Vendor Specific */
135 u32 bios_can_detect:1; /* BIOS can detect the device */
136 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to
137 the VGA device. */
138 u32 pipe_id:3; /* For VGA multiple-head devices. */
139 u32 reserved:10; /* Must be 0 */
140 u32 device_id_scheme:1; /* Device ID Scheme */
141 };
142
143 struct acpi_video_enumerated_device {
144 union {
145 u32 int_val;
146 struct acpi_video_device_attrib attrib;
147 } value;
148 struct acpi_video_device *bind_info;
149 };
150
151 struct acpi_video_bus {
152 struct acpi_device *device;
153 bool backlight_registered;
154 bool backlight_notifier_registered;
155 u8 dos_setting;
156 struct acpi_video_enumerated_device *attached_array;
157 u8 attached_count;
158 struct acpi_video_bus_cap cap;
159 struct acpi_video_bus_flags flags;
160 struct list_head video_device_list;
161 struct mutex device_list_lock; /* protects video_device_list */
162 struct list_head entry;
163 struct input_dev *input;
164 char phys[32]; /* for input device */
165 struct notifier_block pm_nb;
166 struct notifier_block backlight_nb;
167 };
168
169 struct acpi_video_device_flags {
170 u8 crt:1;
171 u8 lcd:1;
172 u8 tvout:1;
173 u8 dvi:1;
174 u8 bios:1;
175 u8 unknown:1;
176 u8 notify:1;
177 u8 reserved:1;
178 };
179
180 struct acpi_video_device_cap {
181 u8 _ADR:1; /* Return the unique ID */
182 u8 _BCL:1; /* Query list of brightness control levels supported */
183 u8 _BCM:1; /* Set the brightness level */
184 u8 _BQC:1; /* Get current brightness level */
185 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
186 u8 _DDC:1; /* Return the EDID for this device */
187 };
188
189 struct acpi_video_brightness_flags {
190 u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
191 u8 _BCL_reversed:1; /* _BCL package is in a reversed order */
192 u8 _BQC_use_index:1; /* _BQC returns an index value */
193 };
194
195 struct acpi_video_device_brightness {
196 int curr;
197 int count;
198 int *levels;
199 struct acpi_video_brightness_flags flags;
200 };
201
202 struct acpi_video_device {
203 unsigned long device_id;
204 struct acpi_video_device_flags flags;
205 struct acpi_video_device_cap cap;
206 struct list_head entry;
207 struct delayed_work switch_brightness_work;
208 int switch_brightness_event;
209 struct acpi_video_bus *video;
210 struct acpi_device *dev;
211 struct acpi_video_device_brightness *brightness;
212 struct backlight_device *backlight;
213 struct thermal_cooling_device *cooling_dev;
214 };
215
216 static const char device_decode[][30] = {
217 "motherboard VGA device",
218 "PCI VGA device",
219 "AGP VGA device",
220 "UNKNOWN",
221 };
222
223 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
224 static void acpi_video_device_rebind(struct acpi_video_bus *video);
225 static void acpi_video_device_bind(struct acpi_video_bus *video,
226 struct acpi_video_device *device);
227 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
228 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
229 int level);
230 static int acpi_video_device_lcd_get_level_current(
231 struct acpi_video_device *device,
232 unsigned long long *level, bool raw);
233 static int acpi_video_get_next_level(struct acpi_video_device *device,
234 u32 level_current, u32 event);
235 static void acpi_video_switch_brightness(struct work_struct *work);
236
237 static bool acpi_video_use_native_backlight(void)
238 {
239 if (use_native_backlight_param != -1)
240 return use_native_backlight_param;
241 else
242 return use_native_backlight_dmi;
243 }
244
245 bool acpi_video_verify_backlight_support(void)
246 {
247 if (acpi_osi_is_win8() && acpi_video_use_native_backlight() &&
248 backlight_device_registered(BACKLIGHT_RAW))
249 return false;
250 return acpi_video_backlight_support();
251 }
252 EXPORT_SYMBOL_GPL(acpi_video_verify_backlight_support);
253
254 /* backlight device sysfs support */
255 static int acpi_video_get_brightness(struct backlight_device *bd)
256 {
257 unsigned long long cur_level;
258 int i;
259 struct acpi_video_device *vd = bl_get_data(bd);
260
261 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
262 return -EINVAL;
263 for (i = 2; i < vd->brightness->count; i++) {
264 if (vd->brightness->levels[i] == cur_level)
265 /*
266 * The first two entries are special - see page 575
267 * of the ACPI spec 3.0
268 */
269 return i - 2;
270 }
271 return 0;
272 }
273
274 static int acpi_video_set_brightness(struct backlight_device *bd)
275 {
276 int request_level = bd->props.brightness + 2;
277 struct acpi_video_device *vd = bl_get_data(bd);
278
279 cancel_delayed_work(&vd->switch_brightness_work);
280 return acpi_video_device_lcd_set_level(vd,
281 vd->brightness->levels[request_level]);
282 }
283
284 static const struct backlight_ops acpi_backlight_ops = {
285 .get_brightness = acpi_video_get_brightness,
286 .update_status = acpi_video_set_brightness,
287 };
288
289 /* thermal cooling device callbacks */
290 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
291 long *state)
292 {
293 struct acpi_device *device = cooling_dev->devdata;
294 struct acpi_video_device *video = acpi_driver_data(device);
295
296 *state = video->brightness->count - 3;
297 return 0;
298 }
299
300 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
301 long *state)
302 {
303 struct acpi_device *device = cooling_dev->devdata;
304 struct acpi_video_device *video = acpi_driver_data(device);
305 unsigned long long level;
306 int offset;
307
308 if (acpi_video_device_lcd_get_level_current(video, &level, false))
309 return -EINVAL;
310 for (offset = 2; offset < video->brightness->count; offset++)
311 if (level == video->brightness->levels[offset]) {
312 *state = video->brightness->count - offset - 1;
313 return 0;
314 }
315
316 return -EINVAL;
317 }
318
319 static int
320 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
321 {
322 struct acpi_device *device = cooling_dev->devdata;
323 struct acpi_video_device *video = acpi_driver_data(device);
324 int level;
325
326 if (state >= video->brightness->count - 2)
327 return -EINVAL;
328
329 state = video->brightness->count - state;
330 level = video->brightness->levels[state - 1];
331 return acpi_video_device_lcd_set_level(video, level);
332 }
333
334 static const struct thermal_cooling_device_ops video_cooling_ops = {
335 .get_max_state = video_get_max_state,
336 .get_cur_state = video_get_cur_state,
337 .set_cur_state = video_set_cur_state,
338 };
339
340 /*
341 * --------------------------------------------------------------------------
342 * Video Management
343 * --------------------------------------------------------------------------
344 */
345
346 static int
347 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
348 union acpi_object **levels)
349 {
350 int status;
351 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
352 union acpi_object *obj;
353
354
355 *levels = NULL;
356
357 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
358 if (!ACPI_SUCCESS(status))
359 return status;
360 obj = (union acpi_object *)buffer.pointer;
361 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
362 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
363 status = -EFAULT;
364 goto err;
365 }
366
367 *levels = obj;
368
369 return 0;
370
371 err:
372 kfree(buffer.pointer);
373
374 return status;
375 }
376
377 static int
378 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
379 {
380 int status;
381 int state;
382
383 status = acpi_execute_simple_method(device->dev->handle,
384 "_BCM", level);
385 if (ACPI_FAILURE(status)) {
386 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
387 return -EIO;
388 }
389
390 device->brightness->curr = level;
391 for (state = 2; state < device->brightness->count; state++)
392 if (level == device->brightness->levels[state]) {
393 if (device->backlight)
394 device->backlight->props.brightness = state - 2;
395 return 0;
396 }
397
398 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
399 return -EINVAL;
400 }
401
402 /*
403 * For some buggy _BQC methods, we need to add a constant value to
404 * the _BQC return value to get the actual current brightness level
405 */
406
407 static int bqc_offset_aml_bug_workaround;
408 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
409 {
410 bqc_offset_aml_bug_workaround = 9;
411 return 0;
412 }
413
414 static int __init video_disable_native_backlight(const struct dmi_system_id *d)
415 {
416 use_native_backlight_dmi = false;
417 return 0;
418 }
419
420 static struct dmi_system_id video_dmi_table[] __initdata = {
421 /*
422 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
423 */
424 {
425 .callback = video_set_bqc_offset,
426 .ident = "Acer Aspire 5720",
427 .matches = {
428 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
429 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
430 },
431 },
432 {
433 .callback = video_set_bqc_offset,
434 .ident = "Acer Aspire 5710Z",
435 .matches = {
436 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
437 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
438 },
439 },
440 {
441 .callback = video_set_bqc_offset,
442 .ident = "eMachines E510",
443 .matches = {
444 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
445 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
446 },
447 },
448 {
449 .callback = video_set_bqc_offset,
450 .ident = "Acer Aspire 5315",
451 .matches = {
452 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
453 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
454 },
455 },
456 {
457 .callback = video_set_bqc_offset,
458 .ident = "Acer Aspire 7720",
459 .matches = {
460 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
461 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
462 },
463 },
464
465 /*
466 * These models have a working acpi_video backlight control, and using
467 * native backlight causes a regression where backlight does not work
468 * when userspace is not handling brightness key events. Disable
469 * native_backlight on these to fix this:
470 * https://bugzilla.kernel.org/show_bug.cgi?id=81691
471 */
472 {
473 .callback = video_disable_native_backlight,
474 .ident = "ThinkPad T420",
475 .matches = {
476 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
477 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
478 },
479 },
480 {
481 .callback = video_disable_native_backlight,
482 .ident = "ThinkPad T520",
483 .matches = {
484 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
485 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
486 },
487 },
488 {
489 .callback = video_disable_native_backlight,
490 .ident = "ThinkPad X201s",
491 .matches = {
492 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
493 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
494 },
495 },
496
497 /* The native backlight controls do not work on some older machines */
498 {
499 /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
500 .callback = video_disable_native_backlight,
501 .ident = "HP ENVY 15 Notebook",
502 .matches = {
503 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
504 DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 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 u32 value;
751
752 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
753 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
754 "LCD brightness level\n"));
755 goto out;
756 }
757
758 if (obj->package.count < 2)
759 goto out;
760
761 br = kzalloc(sizeof(*br), GFP_KERNEL);
762 if (!br) {
763 printk(KERN_ERR "can't allocate memory\n");
764 result = -ENOMEM;
765 goto out;
766 }
767
768 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
769 GFP_KERNEL);
770 if (!br->levels) {
771 result = -ENOMEM;
772 goto out_free;
773 }
774
775 for (i = 0; i < obj->package.count; i++) {
776 o = (union acpi_object *)&obj->package.elements[i];
777 if (o->type != ACPI_TYPE_INTEGER) {
778 printk(KERN_ERR PREFIX "Invalid data\n");
779 continue;
780 }
781 value = (u32) o->integer.value;
782 /* Skip duplicate entries */
783 if (count > 2 && br->levels[count - 1] == value)
784 continue;
785
786 br->levels[count] = value;
787
788 if (br->levels[count] > max_level)
789 max_level = br->levels[count];
790 count++;
791 }
792
793 /*
794 * some buggy BIOS don't export the levels
795 * when machine is on AC/Battery in _BCL package.
796 * In this case, the first two elements in _BCL packages
797 * are also supported brightness levels that OS should take care of.
798 */
799 for (i = 2; i < count; i++) {
800 if (br->levels[i] == br->levels[0])
801 level_ac_battery++;
802 if (br->levels[i] == br->levels[1])
803 level_ac_battery++;
804 }
805
806 if (level_ac_battery < 2) {
807 level_ac_battery = 2 - level_ac_battery;
808 br->flags._BCL_no_ac_battery_levels = 1;
809 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
810 br->levels[i] = br->levels[i - level_ac_battery];
811 count += level_ac_battery;
812 } else if (level_ac_battery > 2)
813 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
814
815 /* Check if the _BCL package is in a reversed order */
816 if (max_level == br->levels[2]) {
817 br->flags._BCL_reversed = 1;
818 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
819 acpi_video_cmp_level, NULL);
820 } else if (max_level != br->levels[count - 1])
821 ACPI_ERROR((AE_INFO,
822 "Found unordered _BCL package"));
823
824 br->count = count;
825 device->brightness = br;
826
827 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
828 br->curr = level = max_level;
829
830 if (!device->cap._BQC)
831 goto set_level;
832
833 result = acpi_video_device_lcd_get_level_current(device,
834 &level_old, true);
835 if (result)
836 goto out_free_levels;
837
838 result = acpi_video_bqc_quirk(device, max_level, level_old);
839 if (result)
840 goto out_free_levels;
841 /*
842 * cap._BQC may get cleared due to _BQC is found to be broken
843 * in acpi_video_bqc_quirk, so check again here.
844 */
845 if (!device->cap._BQC)
846 goto set_level;
847
848 level = acpi_video_bqc_value_to_level(device, level_old);
849 /*
850 * On some buggy laptops, _BQC returns an uninitialized
851 * value when invoked for the first time, i.e.
852 * level_old is invalid (no matter whether it's a level
853 * or an index). Set the backlight to max_level in this case.
854 */
855 for (i = 2; i < br->count; i++)
856 if (level == br->levels[i])
857 break;
858 if (i == br->count || !level)
859 level = max_level;
860
861 set_level:
862 result = acpi_video_device_lcd_set_level(device, level);
863 if (result)
864 goto out_free_levels;
865
866 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
867 "found %d brightness levels\n", count - 2));
868 kfree(obj);
869 return result;
870
871 out_free_levels:
872 kfree(br->levels);
873 out_free:
874 kfree(br);
875 out:
876 device->brightness = NULL;
877 kfree(obj);
878 return result;
879 }
880
881 /*
882 * Arg:
883 * device : video output device (LCD, CRT, ..)
884 *
885 * Return Value:
886 * None
887 *
888 * Find out all required AML methods defined under the output
889 * device.
890 */
891
892 static void acpi_video_device_find_cap(struct acpi_video_device *device)
893 {
894 if (acpi_has_method(device->dev->handle, "_ADR"))
895 device->cap._ADR = 1;
896 if (acpi_has_method(device->dev->handle, "_BCL"))
897 device->cap._BCL = 1;
898 if (acpi_has_method(device->dev->handle, "_BCM"))
899 device->cap._BCM = 1;
900 if (acpi_has_method(device->dev->handle, "_BQC")) {
901 device->cap._BQC = 1;
902 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
903 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
904 device->cap._BCQ = 1;
905 }
906
907 if (acpi_has_method(device->dev->handle, "_DDC"))
908 device->cap._DDC = 1;
909 }
910
911 /*
912 * Arg:
913 * device : video output device (VGA)
914 *
915 * Return Value:
916 * None
917 *
918 * Find out all required AML methods defined under the video bus device.
919 */
920
921 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
922 {
923 if (acpi_has_method(video->device->handle, "_DOS"))
924 video->cap._DOS = 1;
925 if (acpi_has_method(video->device->handle, "_DOD"))
926 video->cap._DOD = 1;
927 if (acpi_has_method(video->device->handle, "_ROM"))
928 video->cap._ROM = 1;
929 if (acpi_has_method(video->device->handle, "_GPD"))
930 video->cap._GPD = 1;
931 if (acpi_has_method(video->device->handle, "_SPD"))
932 video->cap._SPD = 1;
933 if (acpi_has_method(video->device->handle, "_VPO"))
934 video->cap._VPO = 1;
935 }
936
937 /*
938 * Check whether the video bus device has required AML method to
939 * support the desired features
940 */
941
942 static int acpi_video_bus_check(struct acpi_video_bus *video)
943 {
944 acpi_status status = -ENOENT;
945 struct pci_dev *dev;
946
947 if (!video)
948 return -EINVAL;
949
950 dev = acpi_get_pci_dev(video->device->handle);
951 if (!dev)
952 return -ENODEV;
953 pci_dev_put(dev);
954
955 /*
956 * Since there is no HID, CID and so on for VGA driver, we have
957 * to check well known required nodes.
958 */
959
960 /* Does this device support video switching? */
961 if (video->cap._DOS || video->cap._DOD) {
962 if (!video->cap._DOS) {
963 printk(KERN_WARNING FW_BUG
964 "ACPI(%s) defines _DOD but not _DOS\n",
965 acpi_device_bid(video->device));
966 }
967 video->flags.multihead = 1;
968 status = 0;
969 }
970
971 /* Does this device support retrieving a video ROM? */
972 if (video->cap._ROM) {
973 video->flags.rom = 1;
974 status = 0;
975 }
976
977 /* Does this device support configuring which video device to POST? */
978 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
979 video->flags.post = 1;
980 status = 0;
981 }
982
983 return status;
984 }
985
986 /*
987 * --------------------------------------------------------------------------
988 * Driver Interface
989 * --------------------------------------------------------------------------
990 */
991
992 /* device interface */
993 static struct acpi_video_device_attrib *
994 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
995 {
996 struct acpi_video_enumerated_device *ids;
997 int i;
998
999 for (i = 0; i < video->attached_count; i++) {
1000 ids = &video->attached_array[i];
1001 if ((ids->value.int_val & 0xffff) == device_id)
1002 return &ids->value.attrib;
1003 }
1004
1005 return NULL;
1006 }
1007
1008 static int
1009 acpi_video_get_device_type(struct acpi_video_bus *video,
1010 unsigned long device_id)
1011 {
1012 struct acpi_video_enumerated_device *ids;
1013 int i;
1014
1015 for (i = 0; i < video->attached_count; i++) {
1016 ids = &video->attached_array[i];
1017 if ((ids->value.int_val & 0xffff) == device_id)
1018 return ids->value.int_val;
1019 }
1020
1021 return 0;
1022 }
1023
1024 static int
1025 acpi_video_bus_get_one_device(struct acpi_device *device,
1026 struct acpi_video_bus *video)
1027 {
1028 unsigned long long device_id;
1029 int status, device_type;
1030 struct acpi_video_device *data;
1031 struct acpi_video_device_attrib *attribute;
1032
1033 status =
1034 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1035 /* Some device omits _ADR, we skip them instead of fail */
1036 if (ACPI_FAILURE(status))
1037 return 0;
1038
1039 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1040 if (!data)
1041 return -ENOMEM;
1042
1043 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1044 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1045 device->driver_data = data;
1046
1047 data->device_id = device_id;
1048 data->video = video;
1049 data->dev = device;
1050 INIT_DELAYED_WORK(&data->switch_brightness_work,
1051 acpi_video_switch_brightness);
1052
1053 attribute = acpi_video_get_device_attr(video, device_id);
1054
1055 if (attribute && attribute->device_id_scheme) {
1056 switch (attribute->display_type) {
1057 case ACPI_VIDEO_DISPLAY_CRT:
1058 data->flags.crt = 1;
1059 break;
1060 case ACPI_VIDEO_DISPLAY_TV:
1061 data->flags.tvout = 1;
1062 break;
1063 case ACPI_VIDEO_DISPLAY_DVI:
1064 data->flags.dvi = 1;
1065 break;
1066 case ACPI_VIDEO_DISPLAY_LCD:
1067 data->flags.lcd = 1;
1068 break;
1069 default:
1070 data->flags.unknown = 1;
1071 break;
1072 }
1073 if (attribute->bios_can_detect)
1074 data->flags.bios = 1;
1075 } else {
1076 /* Check for legacy IDs */
1077 device_type = acpi_video_get_device_type(video, device_id);
1078 /* Ignore bits 16 and 18-20 */
1079 switch (device_type & 0xffe2ffff) {
1080 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1081 data->flags.crt = 1;
1082 break;
1083 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1084 data->flags.lcd = 1;
1085 break;
1086 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1087 data->flags.tvout = 1;
1088 break;
1089 default:
1090 data->flags.unknown = 1;
1091 }
1092 }
1093
1094 acpi_video_device_bind(video, data);
1095 acpi_video_device_find_cap(data);
1096
1097 mutex_lock(&video->device_list_lock);
1098 list_add_tail(&data->entry, &video->video_device_list);
1099 mutex_unlock(&video->device_list_lock);
1100
1101 return status;
1102 }
1103
1104 /*
1105 * Arg:
1106 * video : video bus device
1107 *
1108 * Return:
1109 * none
1110 *
1111 * Enumerate the video device list of the video bus,
1112 * bind the ids with the corresponding video devices
1113 * under the video bus.
1114 */
1115
1116 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1117 {
1118 struct acpi_video_device *dev;
1119
1120 mutex_lock(&video->device_list_lock);
1121
1122 list_for_each_entry(dev, &video->video_device_list, entry)
1123 acpi_video_device_bind(video, dev);
1124
1125 mutex_unlock(&video->device_list_lock);
1126 }
1127
1128 /*
1129 * Arg:
1130 * video : video bus device
1131 * device : video output device under the video
1132 * bus
1133 *
1134 * Return:
1135 * none
1136 *
1137 * Bind the ids with the corresponding video devices
1138 * under the video bus.
1139 */
1140
1141 static void
1142 acpi_video_device_bind(struct acpi_video_bus *video,
1143 struct acpi_video_device *device)
1144 {
1145 struct acpi_video_enumerated_device *ids;
1146 int i;
1147
1148 for (i = 0; i < video->attached_count; i++) {
1149 ids = &video->attached_array[i];
1150 if (device->device_id == (ids->value.int_val & 0xffff)) {
1151 ids->bind_info = device;
1152 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1153 }
1154 }
1155 }
1156
1157 static bool acpi_video_device_in_dod(struct acpi_video_device *device)
1158 {
1159 struct acpi_video_bus *video = device->video;
1160 int i;
1161
1162 /* If we have a broken _DOD, no need to test */
1163 if (!video->attached_count)
1164 return true;
1165
1166 for (i = 0; i < video->attached_count; i++) {
1167 if (video->attached_array[i].bind_info == device)
1168 return true;
1169 }
1170
1171 return false;
1172 }
1173
1174 /*
1175 * Arg:
1176 * video : video bus device
1177 *
1178 * Return:
1179 * < 0 : error
1180 *
1181 * Call _DOD to enumerate all devices attached to display adapter
1182 *
1183 */
1184
1185 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1186 {
1187 int status;
1188 int count;
1189 int i;
1190 struct acpi_video_enumerated_device *active_list;
1191 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1192 union acpi_object *dod = NULL;
1193 union acpi_object *obj;
1194
1195 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1196 if (!ACPI_SUCCESS(status)) {
1197 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1198 return status;
1199 }
1200
1201 dod = buffer.pointer;
1202 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1203 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1204 status = -EFAULT;
1205 goto out;
1206 }
1207
1208 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1209 dod->package.count));
1210
1211 active_list = kcalloc(1 + dod->package.count,
1212 sizeof(struct acpi_video_enumerated_device),
1213 GFP_KERNEL);
1214 if (!active_list) {
1215 status = -ENOMEM;
1216 goto out;
1217 }
1218
1219 count = 0;
1220 for (i = 0; i < dod->package.count; i++) {
1221 obj = &dod->package.elements[i];
1222
1223 if (obj->type != ACPI_TYPE_INTEGER) {
1224 printk(KERN_ERR PREFIX
1225 "Invalid _DOD data in element %d\n", i);
1226 continue;
1227 }
1228
1229 active_list[count].value.int_val = obj->integer.value;
1230 active_list[count].bind_info = NULL;
1231 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1232 (int)obj->integer.value));
1233 count++;
1234 }
1235
1236 kfree(video->attached_array);
1237
1238 video->attached_array = active_list;
1239 video->attached_count = count;
1240
1241 out:
1242 kfree(buffer.pointer);
1243 return status;
1244 }
1245
1246 static int
1247 acpi_video_get_next_level(struct acpi_video_device *device,
1248 u32 level_current, u32 event)
1249 {
1250 int min, max, min_above, max_below, i, l, delta = 255;
1251 max = max_below = 0;
1252 min = min_above = 255;
1253 /* Find closest level to level_current */
1254 for (i = 2; i < device->brightness->count; i++) {
1255 l = device->brightness->levels[i];
1256 if (abs(l - level_current) < abs(delta)) {
1257 delta = l - level_current;
1258 if (!delta)
1259 break;
1260 }
1261 }
1262 /* Ajust level_current to closest available level */
1263 level_current += delta;
1264 for (i = 2; i < device->brightness->count; i++) {
1265 l = device->brightness->levels[i];
1266 if (l < min)
1267 min = l;
1268 if (l > max)
1269 max = l;
1270 if (l < min_above && l > level_current)
1271 min_above = l;
1272 if (l > max_below && l < level_current)
1273 max_below = l;
1274 }
1275
1276 switch (event) {
1277 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1278 return (level_current < max) ? min_above : min;
1279 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1280 return (level_current < max) ? min_above : max;
1281 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1282 return (level_current > min) ? max_below : min;
1283 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1284 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1285 return 0;
1286 default:
1287 return level_current;
1288 }
1289 }
1290
1291 static void
1292 acpi_video_switch_brightness(struct work_struct *work)
1293 {
1294 struct acpi_video_device *device = container_of(to_delayed_work(work),
1295 struct acpi_video_device, switch_brightness_work);
1296 unsigned long long level_current, level_next;
1297 int event = device->switch_brightness_event;
1298 int result = -EINVAL;
1299
1300 /* no warning message if acpi_backlight=vendor or a quirk is used */
1301 if (!acpi_video_verify_backlight_support())
1302 return;
1303
1304 if (!device->brightness)
1305 goto out;
1306
1307 result = acpi_video_device_lcd_get_level_current(device,
1308 &level_current,
1309 false);
1310 if (result)
1311 goto out;
1312
1313 level_next = acpi_video_get_next_level(device, level_current, event);
1314
1315 result = acpi_video_device_lcd_set_level(device, level_next);
1316
1317 if (!result)
1318 backlight_force_update(device->backlight,
1319 BACKLIGHT_UPDATE_HOTKEY);
1320
1321 out:
1322 if (result)
1323 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1324 }
1325
1326 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1327 void **edid)
1328 {
1329 struct acpi_video_bus *video;
1330 struct acpi_video_device *video_device;
1331 union acpi_object *buffer = NULL;
1332 acpi_status status;
1333 int i, length;
1334
1335 if (!device || !acpi_driver_data(device))
1336 return -EINVAL;
1337
1338 video = acpi_driver_data(device);
1339
1340 for (i = 0; i < video->attached_count; i++) {
1341 video_device = video->attached_array[i].bind_info;
1342 length = 256;
1343
1344 if (!video_device)
1345 continue;
1346
1347 if (!video_device->cap._DDC)
1348 continue;
1349
1350 if (type) {
1351 switch (type) {
1352 case ACPI_VIDEO_DISPLAY_CRT:
1353 if (!video_device->flags.crt)
1354 continue;
1355 break;
1356 case ACPI_VIDEO_DISPLAY_TV:
1357 if (!video_device->flags.tvout)
1358 continue;
1359 break;
1360 case ACPI_VIDEO_DISPLAY_DVI:
1361 if (!video_device->flags.dvi)
1362 continue;
1363 break;
1364 case ACPI_VIDEO_DISPLAY_LCD:
1365 if (!video_device->flags.lcd)
1366 continue;
1367 break;
1368 }
1369 } else if (video_device->device_id != device_id) {
1370 continue;
1371 }
1372
1373 status = acpi_video_device_EDID(video_device, &buffer, length);
1374
1375 if (ACPI_FAILURE(status) || !buffer ||
1376 buffer->type != ACPI_TYPE_BUFFER) {
1377 length = 128;
1378 status = acpi_video_device_EDID(video_device, &buffer,
1379 length);
1380 if (ACPI_FAILURE(status) || !buffer ||
1381 buffer->type != ACPI_TYPE_BUFFER) {
1382 continue;
1383 }
1384 }
1385
1386 *edid = buffer->buffer.pointer;
1387 return length;
1388 }
1389
1390 return -ENODEV;
1391 }
1392 EXPORT_SYMBOL(acpi_video_get_edid);
1393
1394 static int
1395 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1396 struct acpi_device *device)
1397 {
1398 int status = 0;
1399 struct acpi_device *dev;
1400
1401 /*
1402 * There are systems where video module known to work fine regardless
1403 * of broken _DOD and ignoring returned value here doesn't cause
1404 * any issues later.
1405 */
1406 acpi_video_device_enumerate(video);
1407
1408 list_for_each_entry(dev, &device->children, node) {
1409
1410 status = acpi_video_bus_get_one_device(dev, video);
1411 if (status) {
1412 dev_err(&dev->dev, "Can't attach device\n");
1413 break;
1414 }
1415 }
1416 return status;
1417 }
1418
1419 /* acpi_video interface */
1420
1421 /*
1422 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1423 * preform any automatic brightness change on receiving a notification.
1424 */
1425 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1426 {
1427 return acpi_video_bus_DOS(video, 0,
1428 acpi_osi_is_win8() ? 1 : 0);
1429 }
1430
1431 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1432 {
1433 return acpi_video_bus_DOS(video, 0,
1434 acpi_osi_is_win8() ? 0 : 1);
1435 }
1436
1437 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1438 {
1439 struct acpi_video_bus *video = acpi_driver_data(device);
1440 struct input_dev *input;
1441 int keycode = 0;
1442
1443 if (!video || !video->input)
1444 return;
1445
1446 input = video->input;
1447
1448 switch (event) {
1449 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1450 * most likely via hotkey. */
1451 keycode = KEY_SWITCHVIDEOMODE;
1452 break;
1453
1454 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1455 * connector. */
1456 acpi_video_device_enumerate(video);
1457 acpi_video_device_rebind(video);
1458 keycode = KEY_SWITCHVIDEOMODE;
1459 break;
1460
1461 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1462 keycode = KEY_SWITCHVIDEOMODE;
1463 break;
1464 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1465 keycode = KEY_VIDEO_NEXT;
1466 break;
1467 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1468 keycode = KEY_VIDEO_PREV;
1469 break;
1470
1471 default:
1472 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1473 "Unsupported event [0x%x]\n", event));
1474 break;
1475 }
1476
1477 if (acpi_notifier_call_chain(device, event, 0))
1478 /* Something vetoed the keypress. */
1479 keycode = 0;
1480
1481 if (keycode) {
1482 input_report_key(input, keycode, 1);
1483 input_sync(input);
1484 input_report_key(input, keycode, 0);
1485 input_sync(input);
1486 }
1487
1488 return;
1489 }
1490
1491 static void brightness_switch_event(struct acpi_video_device *video_device,
1492 u32 event)
1493 {
1494 if (!brightness_switch_enabled)
1495 return;
1496
1497 video_device->switch_brightness_event = event;
1498 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10);
1499 }
1500
1501 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1502 {
1503 struct acpi_video_device *video_device = data;
1504 struct acpi_device *device = NULL;
1505 struct acpi_video_bus *bus;
1506 struct input_dev *input;
1507 int keycode = 0;
1508
1509 if (!video_device)
1510 return;
1511
1512 device = video_device->dev;
1513 bus = video_device->video;
1514 input = bus->input;
1515
1516 switch (event) {
1517 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1518 brightness_switch_event(video_device, event);
1519 keycode = KEY_BRIGHTNESS_CYCLE;
1520 break;
1521 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1522 brightness_switch_event(video_device, event);
1523 keycode = KEY_BRIGHTNESSUP;
1524 break;
1525 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1526 brightness_switch_event(video_device, event);
1527 keycode = KEY_BRIGHTNESSDOWN;
1528 break;
1529 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1530 brightness_switch_event(video_device, event);
1531 keycode = KEY_BRIGHTNESS_ZERO;
1532 break;
1533 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1534 brightness_switch_event(video_device, event);
1535 keycode = KEY_DISPLAY_OFF;
1536 break;
1537 default:
1538 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1539 "Unsupported event [0x%x]\n", event));
1540 break;
1541 }
1542
1543 acpi_notifier_call_chain(device, event, 0);
1544
1545 if (keycode) {
1546 input_report_key(input, keycode, 1);
1547 input_sync(input);
1548 input_report_key(input, keycode, 0);
1549 input_sync(input);
1550 }
1551
1552 return;
1553 }
1554
1555 static int acpi_video_resume(struct notifier_block *nb,
1556 unsigned long val, void *ign)
1557 {
1558 struct acpi_video_bus *video;
1559 struct acpi_video_device *video_device;
1560 int i;
1561
1562 switch (val) {
1563 case PM_HIBERNATION_PREPARE:
1564 case PM_SUSPEND_PREPARE:
1565 case PM_RESTORE_PREPARE:
1566 return NOTIFY_DONE;
1567 }
1568
1569 video = container_of(nb, struct acpi_video_bus, pm_nb);
1570
1571 dev_info(&video->device->dev, "Restoring backlight state\n");
1572
1573 for (i = 0; i < video->attached_count; i++) {
1574 video_device = video->attached_array[i].bind_info;
1575 if (video_device && video_device->backlight)
1576 acpi_video_set_brightness(video_device->backlight);
1577 }
1578
1579 return NOTIFY_OK;
1580 }
1581
1582 static acpi_status
1583 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1584 void **return_value)
1585 {
1586 struct acpi_device *device = context;
1587 struct acpi_device *sibling;
1588 int result;
1589
1590 if (handle == device->handle)
1591 return AE_CTRL_TERMINATE;
1592
1593 result = acpi_bus_get_device(handle, &sibling);
1594 if (result)
1595 return AE_OK;
1596
1597 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1598 return AE_ALREADY_EXISTS;
1599
1600 return AE_OK;
1601 }
1602
1603 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1604 {
1605 struct backlight_properties props;
1606 struct pci_dev *pdev;
1607 acpi_handle acpi_parent;
1608 struct device *parent = NULL;
1609 int result;
1610 static int count;
1611 char *name;
1612
1613 /*
1614 * Do not create backlight device for video output
1615 * device that is not in the enumerated list.
1616 */
1617 if (!acpi_video_device_in_dod(device)) {
1618 dev_dbg(&device->dev->dev, "not in _DOD list, ignore\n");
1619 return;
1620 }
1621
1622 result = acpi_video_init_brightness(device);
1623 if (result)
1624 return;
1625 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1626 if (!name)
1627 return;
1628 count++;
1629
1630 acpi_get_parent(device->dev->handle, &acpi_parent);
1631
1632 pdev = acpi_get_pci_dev(acpi_parent);
1633 if (pdev) {
1634 parent = &pdev->dev;
1635 pci_dev_put(pdev);
1636 }
1637
1638 memset(&props, 0, sizeof(struct backlight_properties));
1639 props.type = BACKLIGHT_FIRMWARE;
1640 props.max_brightness = device->brightness->count - 3;
1641 device->backlight = backlight_device_register(name,
1642 parent,
1643 device,
1644 &acpi_backlight_ops,
1645 &props);
1646 kfree(name);
1647 if (IS_ERR(device->backlight))
1648 return;
1649
1650 /*
1651 * Save current brightness level in case we have to restore it
1652 * before acpi_video_device_lcd_set_level() is called next time.
1653 */
1654 device->backlight->props.brightness =
1655 acpi_video_get_brightness(device->backlight);
1656
1657 device->cooling_dev = thermal_cooling_device_register("LCD",
1658 device->dev, &video_cooling_ops);
1659 if (IS_ERR(device->cooling_dev)) {
1660 /*
1661 * Set cooling_dev to NULL so we don't crash trying to free it.
1662 * Also, why the hell we are returning early and not attempt to
1663 * register video output if cooling device registration failed?
1664 * -- dtor
1665 */
1666 device->cooling_dev = NULL;
1667 return;
1668 }
1669
1670 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1671 device->cooling_dev->id);
1672 result = sysfs_create_link(&device->dev->dev.kobj,
1673 &device->cooling_dev->device.kobj,
1674 "thermal_cooling");
1675 if (result)
1676 printk(KERN_ERR PREFIX "Create sysfs link\n");
1677 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1678 &device->dev->dev.kobj, "device");
1679 if (result)
1680 printk(KERN_ERR PREFIX "Create sysfs link\n");
1681 }
1682
1683 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1684 {
1685 struct acpi_video_device *dev;
1686
1687 if (video->backlight_registered)
1688 return 0;
1689
1690 if (!acpi_video_verify_backlight_support())
1691 return 0;
1692
1693 mutex_lock(&video->device_list_lock);
1694 list_for_each_entry(dev, &video->video_device_list, entry)
1695 acpi_video_dev_register_backlight(dev);
1696 mutex_unlock(&video->device_list_lock);
1697
1698 video->backlight_registered = true;
1699
1700 video->pm_nb.notifier_call = acpi_video_resume;
1701 video->pm_nb.priority = 0;
1702 return register_pm_notifier(&video->pm_nb);
1703 }
1704
1705 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1706 {
1707 if (device->backlight) {
1708 backlight_device_unregister(device->backlight);
1709 device->backlight = NULL;
1710 }
1711 if (device->brightness) {
1712 kfree(device->brightness->levels);
1713 kfree(device->brightness);
1714 device->brightness = NULL;
1715 }
1716 if (device->cooling_dev) {
1717 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1718 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1719 thermal_cooling_device_unregister(device->cooling_dev);
1720 device->cooling_dev = NULL;
1721 }
1722 }
1723
1724 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1725 {
1726 struct acpi_video_device *dev;
1727 int error;
1728
1729 if (!video->backlight_registered)
1730 return 0;
1731
1732 error = unregister_pm_notifier(&video->pm_nb);
1733
1734 mutex_lock(&video->device_list_lock);
1735 list_for_each_entry(dev, &video->video_device_list, entry)
1736 acpi_video_dev_unregister_backlight(dev);
1737 mutex_unlock(&video->device_list_lock);
1738
1739 video->backlight_registered = false;
1740
1741 return error;
1742 }
1743
1744 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1745 {
1746 acpi_status status;
1747 struct acpi_device *adev = device->dev;
1748
1749 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1750 acpi_video_device_notify, device);
1751 if (ACPI_FAILURE(status))
1752 dev_err(&adev->dev, "Error installing notify handler\n");
1753 else
1754 device->flags.notify = 1;
1755 }
1756
1757 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1758 {
1759 struct input_dev *input;
1760 struct acpi_video_device *dev;
1761 int error;
1762
1763 video->input = input = input_allocate_device();
1764 if (!input) {
1765 error = -ENOMEM;
1766 goto out;
1767 }
1768
1769 error = acpi_video_bus_start_devices(video);
1770 if (error)
1771 goto err_free_input;
1772
1773 snprintf(video->phys, sizeof(video->phys),
1774 "%s/video/input0", acpi_device_hid(video->device));
1775
1776 input->name = acpi_device_name(video->device);
1777 input->phys = video->phys;
1778 input->id.bustype = BUS_HOST;
1779 input->id.product = 0x06;
1780 input->dev.parent = &video->device->dev;
1781 input->evbit[0] = BIT(EV_KEY);
1782 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1783 set_bit(KEY_VIDEO_NEXT, input->keybit);
1784 set_bit(KEY_VIDEO_PREV, input->keybit);
1785 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1786 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1787 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1788 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1789 set_bit(KEY_DISPLAY_OFF, input->keybit);
1790
1791 error = input_register_device(input);
1792 if (error)
1793 goto err_stop_dev;
1794
1795 mutex_lock(&video->device_list_lock);
1796 list_for_each_entry(dev, &video->video_device_list, entry)
1797 acpi_video_dev_add_notify_handler(dev);
1798 mutex_unlock(&video->device_list_lock);
1799
1800 return 0;
1801
1802 err_stop_dev:
1803 acpi_video_bus_stop_devices(video);
1804 err_free_input:
1805 input_free_device(input);
1806 video->input = NULL;
1807 out:
1808 return error;
1809 }
1810
1811 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1812 {
1813 if (dev->flags.notify) {
1814 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1815 acpi_video_device_notify);
1816 dev->flags.notify = 0;
1817 }
1818 }
1819
1820 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1821 {
1822 struct acpi_video_device *dev;
1823
1824 mutex_lock(&video->device_list_lock);
1825 list_for_each_entry(dev, &video->video_device_list, entry)
1826 acpi_video_dev_remove_notify_handler(dev);
1827 mutex_unlock(&video->device_list_lock);
1828
1829 acpi_video_bus_stop_devices(video);
1830 input_unregister_device(video->input);
1831 video->input = NULL;
1832 }
1833
1834 static int acpi_video_backlight_notify(struct notifier_block *nb,
1835 unsigned long val, void *bd)
1836 {
1837 struct backlight_device *backlight = bd;
1838 struct acpi_video_bus *video;
1839
1840 /* acpi_video_verify_backlight_support only cares about raw devices */
1841 if (backlight->props.type != BACKLIGHT_RAW)
1842 return NOTIFY_DONE;
1843
1844 video = container_of(nb, struct acpi_video_bus, backlight_nb);
1845
1846 switch (val) {
1847 case BACKLIGHT_REGISTERED:
1848 if (!acpi_video_verify_backlight_support())
1849 acpi_video_bus_unregister_backlight(video);
1850 break;
1851 case BACKLIGHT_UNREGISTERED:
1852 acpi_video_bus_register_backlight(video);
1853 break;
1854 }
1855
1856 return NOTIFY_OK;
1857 }
1858
1859 static int acpi_video_bus_add_backlight_notify_handler(
1860 struct acpi_video_bus *video)
1861 {
1862 int error;
1863
1864 video->backlight_nb.notifier_call = acpi_video_backlight_notify;
1865 video->backlight_nb.priority = 0;
1866 error = backlight_register_notifier(&video->backlight_nb);
1867 if (error == 0)
1868 video->backlight_notifier_registered = true;
1869
1870 return error;
1871 }
1872
1873 static int acpi_video_bus_remove_backlight_notify_handler(
1874 struct acpi_video_bus *video)
1875 {
1876 if (!video->backlight_notifier_registered)
1877 return 0;
1878
1879 video->backlight_notifier_registered = false;
1880
1881 return backlight_unregister_notifier(&video->backlight_nb);
1882 }
1883
1884 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1885 {
1886 struct acpi_video_device *dev, *next;
1887
1888 mutex_lock(&video->device_list_lock);
1889 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1890 list_del(&dev->entry);
1891 kfree(dev);
1892 }
1893 mutex_unlock(&video->device_list_lock);
1894
1895 return 0;
1896 }
1897
1898 static int instance;
1899
1900 static int acpi_video_bus_add(struct acpi_device *device)
1901 {
1902 struct acpi_video_bus *video;
1903 int error;
1904 acpi_status status;
1905
1906 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1907 device->parent->handle, 1,
1908 acpi_video_bus_match, NULL,
1909 device, NULL);
1910 if (status == AE_ALREADY_EXISTS) {
1911 printk(KERN_WARNING FW_BUG
1912 "Duplicate ACPI video bus devices for the"
1913 " same VGA controller, please try module "
1914 "parameter \"video.allow_duplicates=1\""
1915 "if the current driver doesn't work.\n");
1916 if (!allow_duplicates)
1917 return -ENODEV;
1918 }
1919
1920 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1921 if (!video)
1922 return -ENOMEM;
1923
1924 /* a hack to fix the duplicate name "VID" problem on T61 */
1925 if (!strcmp(device->pnp.bus_id, "VID")) {
1926 if (instance)
1927 device->pnp.bus_id[3] = '0' + instance;
1928 instance++;
1929 }
1930 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1931 if (!strcmp(device->pnp.bus_id, "VGA")) {
1932 if (instance)
1933 device->pnp.bus_id[3] = '0' + instance;
1934 instance++;
1935 }
1936
1937 video->device = device;
1938 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1939 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1940 device->driver_data = video;
1941
1942 acpi_video_bus_find_cap(video);
1943 error = acpi_video_bus_check(video);
1944 if (error)
1945 goto err_free_video;
1946
1947 mutex_init(&video->device_list_lock);
1948 INIT_LIST_HEAD(&video->video_device_list);
1949
1950 error = acpi_video_bus_get_devices(video, device);
1951 if (error)
1952 goto err_put_video;
1953
1954 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
1955 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1956 video->flags.multihead ? "yes" : "no",
1957 video->flags.rom ? "yes" : "no",
1958 video->flags.post ? "yes" : "no");
1959 mutex_lock(&video_list_lock);
1960 list_add_tail(&video->entry, &video_bus_head);
1961 mutex_unlock(&video_list_lock);
1962
1963 acpi_video_bus_register_backlight(video);
1964 acpi_video_bus_add_notify_handler(video);
1965 acpi_video_bus_add_backlight_notify_handler(video);
1966
1967 return 0;
1968
1969 err_put_video:
1970 acpi_video_bus_put_devices(video);
1971 kfree(video->attached_array);
1972 err_free_video:
1973 kfree(video);
1974 device->driver_data = NULL;
1975
1976 return error;
1977 }
1978
1979 static int acpi_video_bus_remove(struct acpi_device *device)
1980 {
1981 struct acpi_video_bus *video = NULL;
1982
1983
1984 if (!device || !acpi_driver_data(device))
1985 return -EINVAL;
1986
1987 video = acpi_driver_data(device);
1988
1989 acpi_video_bus_remove_backlight_notify_handler(video);
1990 acpi_video_bus_remove_notify_handler(video);
1991 acpi_video_bus_unregister_backlight(video);
1992 acpi_video_bus_put_devices(video);
1993
1994 mutex_lock(&video_list_lock);
1995 list_del(&video->entry);
1996 mutex_unlock(&video_list_lock);
1997
1998 kfree(video->attached_array);
1999 kfree(video);
2000
2001 return 0;
2002 }
2003
2004 static int __init is_i740(struct pci_dev *dev)
2005 {
2006 if (dev->device == 0x00D1)
2007 return 1;
2008 if (dev->device == 0x7000)
2009 return 1;
2010 return 0;
2011 }
2012
2013 static int __init intel_opregion_present(void)
2014 {
2015 int opregion = 0;
2016 struct pci_dev *dev = NULL;
2017 u32 address;
2018
2019 for_each_pci_dev(dev) {
2020 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2021 continue;
2022 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2023 continue;
2024 /* We don't want to poke around undefined i740 registers */
2025 if (is_i740(dev))
2026 continue;
2027 pci_read_config_dword(dev, 0xfc, &address);
2028 if (!address)
2029 continue;
2030 opregion = 1;
2031 }
2032 return opregion;
2033 }
2034
2035 int acpi_video_register(void)
2036 {
2037 int result = 0;
2038 if (register_count) {
2039 /*
2040 * if the function of acpi_video_register is already called,
2041 * don't register the acpi_vide_bus again and return no error.
2042 */
2043 return 0;
2044 }
2045
2046 mutex_init(&video_list_lock);
2047 INIT_LIST_HEAD(&video_bus_head);
2048
2049 result = acpi_bus_register_driver(&acpi_video_bus);
2050 if (result < 0)
2051 return -ENODEV;
2052
2053 /*
2054 * When the acpi_video_bus is loaded successfully, increase
2055 * the counter reference.
2056 */
2057 register_count = 1;
2058
2059 return 0;
2060 }
2061 EXPORT_SYMBOL(acpi_video_register);
2062
2063 void acpi_video_unregister(void)
2064 {
2065 if (!register_count) {
2066 /*
2067 * If the acpi video bus is already unloaded, don't
2068 * unload it again and return directly.
2069 */
2070 return;
2071 }
2072 acpi_bus_unregister_driver(&acpi_video_bus);
2073
2074 register_count = 0;
2075
2076 return;
2077 }
2078 EXPORT_SYMBOL(acpi_video_unregister);
2079
2080 void acpi_video_unregister_backlight(void)
2081 {
2082 struct acpi_video_bus *video;
2083
2084 if (!register_count)
2085 return;
2086
2087 mutex_lock(&video_list_lock);
2088 list_for_each_entry(video, &video_bus_head, entry)
2089 acpi_video_bus_unregister_backlight(video);
2090 mutex_unlock(&video_list_lock);
2091 }
2092 EXPORT_SYMBOL(acpi_video_unregister_backlight);
2093
2094 /*
2095 * This is kind of nasty. Hardware using Intel chipsets may require
2096 * the video opregion code to be run first in order to initialise
2097 * state before any ACPI video calls are made. To handle this we defer
2098 * registration of the video class until the opregion code has run.
2099 */
2100
2101 static int __init acpi_video_init(void)
2102 {
2103 dmi_check_system(video_dmi_table);
2104
2105 if (intel_opregion_present())
2106 return 0;
2107
2108 return acpi_video_register();
2109 }
2110
2111 static void __exit acpi_video_exit(void)
2112 {
2113 acpi_video_unregister();
2114
2115 return;
2116 }
2117
2118 module_init(acpi_video_init);
2119 module_exit(acpi_video_exit);
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