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ACPI / video: check _DOD list when creating backlight devices
[deliverable/linux.git] / drivers / acpi / video.c
1 /*
2 * video.c - ACPI Video Driver
3 *
4 * Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
5 * Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
6 * Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
7 *
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or (at
13 * your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
23 *
24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25 */
26
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/types.h>
31 #include <linux/list.h>
32 #include <linux/mutex.h>
33 #include <linux/input.h>
34 #include <linux/backlight.h>
35 #include <linux/thermal.h>
36 #include <linux/sort.h>
37 #include <linux/pci.h>
38 #include <linux/pci_ids.h>
39 #include <linux/slab.h>
40 #include <linux/dmi.h>
41 #include <linux/suspend.h>
42 #include <linux/acpi.h>
43 #include <acpi/video.h>
44 #include <asm/uaccess.h>
45
46 #include "internal.h"
47
48 #define ACPI_VIDEO_BUS_NAME "Video Bus"
49 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
50 #define ACPI_VIDEO_NOTIFY_SWITCH 0x80
51 #define ACPI_VIDEO_NOTIFY_PROBE 0x81
52 #define ACPI_VIDEO_NOTIFY_CYCLE 0x82
53 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
54 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
55
56 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
57 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
58 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
59 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
60 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
61
62 #define MAX_NAME_LEN 20
63
64 #define _COMPONENT ACPI_VIDEO_COMPONENT
65 ACPI_MODULE_NAME("video");
66
67 MODULE_AUTHOR("Bruno Ducrot");
68 MODULE_DESCRIPTION("ACPI Video Driver");
69 MODULE_LICENSE("GPL");
70
71 static bool brightness_switch_enabled = 1;
72 module_param(brightness_switch_enabled, bool, 0644);
73
74 /*
75 * By default, we don't allow duplicate ACPI video bus devices
76 * under the same VGA controller
77 */
78 static bool allow_duplicates;
79 module_param(allow_duplicates, bool, 0644);
80
81 /*
82 * For Windows 8 systems: used to decide if video module
83 * should skip registering backlight interface of its own.
84 */
85 static int use_native_backlight_param = -1;
86 module_param_named(use_native_backlight, use_native_backlight_param, int, 0444);
87 static bool use_native_backlight_dmi = 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 /* The native backlight controls do not work on some older machines */
490 {
491 /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
492 .callback = video_disable_native_backlight,
493 .ident = "HP ENVY 15 Notebook",
494 .matches = {
495 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
496 DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
497 },
498 },
499 {}
500 };
501
502 static unsigned long long
503 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
504 unsigned long long bqc_value)
505 {
506 unsigned long long level;
507
508 if (device->brightness->flags._BQC_use_index) {
509 /*
510 * _BQC returns an index that doesn't account for
511 * the first 2 items with special meaning, so we need
512 * to compensate for that by offsetting ourselves
513 */
514 if (device->brightness->flags._BCL_reversed)
515 bqc_value = device->brightness->count - 3 - bqc_value;
516
517 level = device->brightness->levels[bqc_value + 2];
518 } else {
519 level = bqc_value;
520 }
521
522 level += bqc_offset_aml_bug_workaround;
523
524 return level;
525 }
526
527 static int
528 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
529 unsigned long long *level, bool raw)
530 {
531 acpi_status status = AE_OK;
532 int i;
533
534 if (device->cap._BQC || device->cap._BCQ) {
535 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
536
537 status = acpi_evaluate_integer(device->dev->handle, buf,
538 NULL, level);
539 if (ACPI_SUCCESS(status)) {
540 if (raw) {
541 /*
542 * Caller has indicated he wants the raw
543 * value returned by _BQC, so don't furtherly
544 * mess with the value.
545 */
546 return 0;
547 }
548
549 *level = acpi_video_bqc_value_to_level(device, *level);
550
551 for (i = 2; i < device->brightness->count; i++)
552 if (device->brightness->levels[i] == *level) {
553 device->brightness->curr = *level;
554 return 0;
555 }
556 /*
557 * BQC returned an invalid level.
558 * Stop using it.
559 */
560 ACPI_WARNING((AE_INFO,
561 "%s returned an invalid level",
562 buf));
563 device->cap._BQC = device->cap._BCQ = 0;
564 } else {
565 /*
566 * Fixme:
567 * should we return an error or ignore this failure?
568 * dev->brightness->curr is a cached value which stores
569 * the correct current backlight level in most cases.
570 * ACPI video backlight still works w/ buggy _BQC.
571 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
572 */
573 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
574 device->cap._BQC = device->cap._BCQ = 0;
575 }
576 }
577
578 *level = device->brightness->curr;
579 return 0;
580 }
581
582 static int
583 acpi_video_device_EDID(struct acpi_video_device *device,
584 union acpi_object **edid, ssize_t length)
585 {
586 int status;
587 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
588 union acpi_object *obj;
589 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
590 struct acpi_object_list args = { 1, &arg0 };
591
592
593 *edid = NULL;
594
595 if (!device)
596 return -ENODEV;
597 if (length == 128)
598 arg0.integer.value = 1;
599 else if (length == 256)
600 arg0.integer.value = 2;
601 else
602 return -EINVAL;
603
604 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
605 if (ACPI_FAILURE(status))
606 return -ENODEV;
607
608 obj = buffer.pointer;
609
610 if (obj && obj->type == ACPI_TYPE_BUFFER)
611 *edid = obj;
612 else {
613 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
614 status = -EFAULT;
615 kfree(obj);
616 }
617
618 return status;
619 }
620
621 /* bus */
622
623 /*
624 * Arg:
625 * video : video bus device pointer
626 * bios_flag :
627 * 0. The system BIOS should NOT automatically switch(toggle)
628 * the active display output.
629 * 1. The system BIOS should automatically switch (toggle) the
630 * active display output. No switch event.
631 * 2. The _DGS value should be locked.
632 * 3. The system BIOS should not automatically switch (toggle) the
633 * active display output, but instead generate the display switch
634 * event notify code.
635 * lcd_flag :
636 * 0. The system BIOS should automatically control the brightness level
637 * of the LCD when the power changes from AC to DC
638 * 1. The system BIOS should NOT automatically control the brightness
639 * level of the LCD when the power changes from AC to DC.
640 * Return Value:
641 * -EINVAL wrong arg.
642 */
643
644 static int
645 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
646 {
647 acpi_status status;
648
649 if (!video->cap._DOS)
650 return 0;
651
652 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
653 return -EINVAL;
654 video->dos_setting = (lcd_flag << 2) | bios_flag;
655 status = acpi_execute_simple_method(video->device->handle, "_DOS",
656 (lcd_flag << 2) | bios_flag);
657 if (ACPI_FAILURE(status))
658 return -EIO;
659
660 return 0;
661 }
662
663 /*
664 * Simple comparison function used to sort backlight levels.
665 */
666
667 static int
668 acpi_video_cmp_level(const void *a, const void *b)
669 {
670 return *(int *)a - *(int *)b;
671 }
672
673 /*
674 * Decides if _BQC/_BCQ for this system is usable
675 *
676 * We do this by changing the level first and then read out the current
677 * brightness level, if the value does not match, find out if it is using
678 * index. If not, clear the _BQC/_BCQ capability.
679 */
680 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
681 int max_level, int current_level)
682 {
683 struct acpi_video_device_brightness *br = device->brightness;
684 int result;
685 unsigned long long level;
686 int test_level;
687
688 /* don't mess with existing known broken systems */
689 if (bqc_offset_aml_bug_workaround)
690 return 0;
691
692 /*
693 * Some systems always report current brightness level as maximum
694 * through _BQC, we need to test another value for them.
695 */
696 test_level = current_level == max_level ? br->levels[3] : max_level;
697
698 result = acpi_video_device_lcd_set_level(device, test_level);
699 if (result)
700 return result;
701
702 result = acpi_video_device_lcd_get_level_current(device, &level, true);
703 if (result)
704 return result;
705
706 if (level != test_level) {
707 /* buggy _BQC found, need to find out if it uses index */
708 if (level < br->count) {
709 if (br->flags._BCL_reversed)
710 level = br->count - 3 - level;
711 if (br->levels[level + 2] == test_level)
712 br->flags._BQC_use_index = 1;
713 }
714
715 if (!br->flags._BQC_use_index)
716 device->cap._BQC = device->cap._BCQ = 0;
717 }
718
719 return 0;
720 }
721
722
723 /*
724 * Arg:
725 * device : video output device (LCD, CRT, ..)
726 *
727 * Return Value:
728 * Maximum brightness level
729 *
730 * Allocate and initialize device->brightness.
731 */
732
733 static int
734 acpi_video_init_brightness(struct acpi_video_device *device)
735 {
736 union acpi_object *obj = NULL;
737 int i, max_level = 0, count = 0, level_ac_battery = 0;
738 unsigned long long level, level_old;
739 union acpi_object *o;
740 struct acpi_video_device_brightness *br = NULL;
741 int result = -EINVAL;
742 u32 value;
743
744 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
745 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
746 "LCD brightness level\n"));
747 goto out;
748 }
749
750 if (obj->package.count < 2)
751 goto out;
752
753 br = kzalloc(sizeof(*br), GFP_KERNEL);
754 if (!br) {
755 printk(KERN_ERR "can't allocate memory\n");
756 result = -ENOMEM;
757 goto out;
758 }
759
760 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
761 GFP_KERNEL);
762 if (!br->levels) {
763 result = -ENOMEM;
764 goto out_free;
765 }
766
767 for (i = 0; i < obj->package.count; i++) {
768 o = (union acpi_object *)&obj->package.elements[i];
769 if (o->type != ACPI_TYPE_INTEGER) {
770 printk(KERN_ERR PREFIX "Invalid data\n");
771 continue;
772 }
773 value = (u32) o->integer.value;
774 /* Skip duplicate entries */
775 if (count > 2 && br->levels[count - 1] == value)
776 continue;
777
778 br->levels[count] = value;
779
780 if (br->levels[count] > max_level)
781 max_level = br->levels[count];
782 count++;
783 }
784
785 /*
786 * some buggy BIOS don't export the levels
787 * when machine is on AC/Battery in _BCL package.
788 * In this case, the first two elements in _BCL packages
789 * are also supported brightness levels that OS should take care of.
790 */
791 for (i = 2; i < count; i++) {
792 if (br->levels[i] == br->levels[0])
793 level_ac_battery++;
794 if (br->levels[i] == br->levels[1])
795 level_ac_battery++;
796 }
797
798 if (level_ac_battery < 2) {
799 level_ac_battery = 2 - level_ac_battery;
800 br->flags._BCL_no_ac_battery_levels = 1;
801 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
802 br->levels[i] = br->levels[i - level_ac_battery];
803 count += level_ac_battery;
804 } else if (level_ac_battery > 2)
805 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
806
807 /* Check if the _BCL package is in a reversed order */
808 if (max_level == br->levels[2]) {
809 br->flags._BCL_reversed = 1;
810 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
811 acpi_video_cmp_level, NULL);
812 } else if (max_level != br->levels[count - 1])
813 ACPI_ERROR((AE_INFO,
814 "Found unordered _BCL package"));
815
816 br->count = count;
817 device->brightness = br;
818
819 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
820 br->curr = level = max_level;
821
822 if (!device->cap._BQC)
823 goto set_level;
824
825 result = acpi_video_device_lcd_get_level_current(device,
826 &level_old, true);
827 if (result)
828 goto out_free_levels;
829
830 result = acpi_video_bqc_quirk(device, max_level, level_old);
831 if (result)
832 goto out_free_levels;
833 /*
834 * cap._BQC may get cleared due to _BQC is found to be broken
835 * in acpi_video_bqc_quirk, so check again here.
836 */
837 if (!device->cap._BQC)
838 goto set_level;
839
840 level = acpi_video_bqc_value_to_level(device, level_old);
841 /*
842 * On some buggy laptops, _BQC returns an uninitialized
843 * value when invoked for the first time, i.e.
844 * level_old is invalid (no matter whether it's a level
845 * or an index). Set the backlight to max_level in this case.
846 */
847 for (i = 2; i < br->count; i++)
848 if (level == br->levels[i])
849 break;
850 if (i == br->count || !level)
851 level = max_level;
852
853 set_level:
854 result = acpi_video_device_lcd_set_level(device, level);
855 if (result)
856 goto out_free_levels;
857
858 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
859 "found %d brightness levels\n", count - 2));
860 kfree(obj);
861 return result;
862
863 out_free_levels:
864 kfree(br->levels);
865 out_free:
866 kfree(br);
867 out:
868 device->brightness = NULL;
869 kfree(obj);
870 return result;
871 }
872
873 /*
874 * Arg:
875 * device : video output device (LCD, CRT, ..)
876 *
877 * Return Value:
878 * None
879 *
880 * Find out all required AML methods defined under the output
881 * device.
882 */
883
884 static void acpi_video_device_find_cap(struct acpi_video_device *device)
885 {
886 if (acpi_has_method(device->dev->handle, "_ADR"))
887 device->cap._ADR = 1;
888 if (acpi_has_method(device->dev->handle, "_BCL"))
889 device->cap._BCL = 1;
890 if (acpi_has_method(device->dev->handle, "_BCM"))
891 device->cap._BCM = 1;
892 if (acpi_has_method(device->dev->handle, "_BQC")) {
893 device->cap._BQC = 1;
894 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
895 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
896 device->cap._BCQ = 1;
897 }
898
899 if (acpi_has_method(device->dev->handle, "_DDC"))
900 device->cap._DDC = 1;
901 }
902
903 /*
904 * Arg:
905 * device : video output device (VGA)
906 *
907 * Return Value:
908 * None
909 *
910 * Find out all required AML methods defined under the video bus device.
911 */
912
913 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
914 {
915 if (acpi_has_method(video->device->handle, "_DOS"))
916 video->cap._DOS = 1;
917 if (acpi_has_method(video->device->handle, "_DOD"))
918 video->cap._DOD = 1;
919 if (acpi_has_method(video->device->handle, "_ROM"))
920 video->cap._ROM = 1;
921 if (acpi_has_method(video->device->handle, "_GPD"))
922 video->cap._GPD = 1;
923 if (acpi_has_method(video->device->handle, "_SPD"))
924 video->cap._SPD = 1;
925 if (acpi_has_method(video->device->handle, "_VPO"))
926 video->cap._VPO = 1;
927 }
928
929 /*
930 * Check whether the video bus device has required AML method to
931 * support the desired features
932 */
933
934 static int acpi_video_bus_check(struct acpi_video_bus *video)
935 {
936 acpi_status status = -ENOENT;
937 struct pci_dev *dev;
938
939 if (!video)
940 return -EINVAL;
941
942 dev = acpi_get_pci_dev(video->device->handle);
943 if (!dev)
944 return -ENODEV;
945 pci_dev_put(dev);
946
947 /*
948 * Since there is no HID, CID and so on for VGA driver, we have
949 * to check well known required nodes.
950 */
951
952 /* Does this device support video switching? */
953 if (video->cap._DOS || video->cap._DOD) {
954 if (!video->cap._DOS) {
955 printk(KERN_WARNING FW_BUG
956 "ACPI(%s) defines _DOD but not _DOS\n",
957 acpi_device_bid(video->device));
958 }
959 video->flags.multihead = 1;
960 status = 0;
961 }
962
963 /* Does this device support retrieving a video ROM? */
964 if (video->cap._ROM) {
965 video->flags.rom = 1;
966 status = 0;
967 }
968
969 /* Does this device support configuring which video device to POST? */
970 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
971 video->flags.post = 1;
972 status = 0;
973 }
974
975 return status;
976 }
977
978 /*
979 * --------------------------------------------------------------------------
980 * Driver Interface
981 * --------------------------------------------------------------------------
982 */
983
984 /* device interface */
985 static struct acpi_video_device_attrib *
986 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
987 {
988 struct acpi_video_enumerated_device *ids;
989 int i;
990
991 for (i = 0; i < video->attached_count; i++) {
992 ids = &video->attached_array[i];
993 if ((ids->value.int_val & 0xffff) == device_id)
994 return &ids->value.attrib;
995 }
996
997 return NULL;
998 }
999
1000 static int
1001 acpi_video_get_device_type(struct acpi_video_bus *video,
1002 unsigned long device_id)
1003 {
1004 struct acpi_video_enumerated_device *ids;
1005 int i;
1006
1007 for (i = 0; i < video->attached_count; i++) {
1008 ids = &video->attached_array[i];
1009 if ((ids->value.int_val & 0xffff) == device_id)
1010 return ids->value.int_val;
1011 }
1012
1013 return 0;
1014 }
1015
1016 static int
1017 acpi_video_bus_get_one_device(struct acpi_device *device,
1018 struct acpi_video_bus *video)
1019 {
1020 unsigned long long device_id;
1021 int status, device_type;
1022 struct acpi_video_device *data;
1023 struct acpi_video_device_attrib *attribute;
1024
1025 status =
1026 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1027 /* Some device omits _ADR, we skip them instead of fail */
1028 if (ACPI_FAILURE(status))
1029 return 0;
1030
1031 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1032 if (!data)
1033 return -ENOMEM;
1034
1035 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1036 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1037 device->driver_data = data;
1038
1039 data->device_id = device_id;
1040 data->video = video;
1041 data->dev = device;
1042 INIT_DELAYED_WORK(&data->switch_brightness_work,
1043 acpi_video_switch_brightness);
1044
1045 attribute = acpi_video_get_device_attr(video, device_id);
1046
1047 if (attribute && attribute->device_id_scheme) {
1048 switch (attribute->display_type) {
1049 case ACPI_VIDEO_DISPLAY_CRT:
1050 data->flags.crt = 1;
1051 break;
1052 case ACPI_VIDEO_DISPLAY_TV:
1053 data->flags.tvout = 1;
1054 break;
1055 case ACPI_VIDEO_DISPLAY_DVI:
1056 data->flags.dvi = 1;
1057 break;
1058 case ACPI_VIDEO_DISPLAY_LCD:
1059 data->flags.lcd = 1;
1060 break;
1061 default:
1062 data->flags.unknown = 1;
1063 break;
1064 }
1065 if (attribute->bios_can_detect)
1066 data->flags.bios = 1;
1067 } else {
1068 /* Check for legacy IDs */
1069 device_type = acpi_video_get_device_type(video, device_id);
1070 /* Ignore bits 16 and 18-20 */
1071 switch (device_type & 0xffe2ffff) {
1072 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1073 data->flags.crt = 1;
1074 break;
1075 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1076 data->flags.lcd = 1;
1077 break;
1078 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1079 data->flags.tvout = 1;
1080 break;
1081 default:
1082 data->flags.unknown = 1;
1083 }
1084 }
1085
1086 acpi_video_device_bind(video, data);
1087 acpi_video_device_find_cap(data);
1088
1089 mutex_lock(&video->device_list_lock);
1090 list_add_tail(&data->entry, &video->video_device_list);
1091 mutex_unlock(&video->device_list_lock);
1092
1093 return status;
1094 }
1095
1096 /*
1097 * Arg:
1098 * video : video bus device
1099 *
1100 * Return:
1101 * none
1102 *
1103 * Enumerate the video device list of the video bus,
1104 * bind the ids with the corresponding video devices
1105 * under the video bus.
1106 */
1107
1108 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1109 {
1110 struct acpi_video_device *dev;
1111
1112 mutex_lock(&video->device_list_lock);
1113
1114 list_for_each_entry(dev, &video->video_device_list, entry)
1115 acpi_video_device_bind(video, dev);
1116
1117 mutex_unlock(&video->device_list_lock);
1118 }
1119
1120 /*
1121 * Arg:
1122 * video : video bus device
1123 * device : video output device under the video
1124 * bus
1125 *
1126 * Return:
1127 * none
1128 *
1129 * Bind the ids with the corresponding video devices
1130 * under the video bus.
1131 */
1132
1133 static void
1134 acpi_video_device_bind(struct acpi_video_bus *video,
1135 struct acpi_video_device *device)
1136 {
1137 struct acpi_video_enumerated_device *ids;
1138 int i;
1139
1140 for (i = 0; i < video->attached_count; i++) {
1141 ids = &video->attached_array[i];
1142 if (device->device_id == (ids->value.int_val & 0xffff)) {
1143 ids->bind_info = device;
1144 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1145 }
1146 }
1147 }
1148
1149 static bool acpi_video_device_in_dod(struct acpi_video_device *device)
1150 {
1151 struct acpi_video_bus *video = device->video;
1152 int i;
1153
1154 /* If we have a broken _DOD, no need to test */
1155 if (!video->attached_count)
1156 return true;
1157
1158 for (i = 0; i < video->attached_count; i++) {
1159 if (video->attached_array[i].bind_info == device)
1160 return true;
1161 }
1162
1163 return false;
1164 }
1165
1166 /*
1167 * Arg:
1168 * video : video bus device
1169 *
1170 * Return:
1171 * < 0 : error
1172 *
1173 * Call _DOD to enumerate all devices attached to display adapter
1174 *
1175 */
1176
1177 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1178 {
1179 int status;
1180 int count;
1181 int i;
1182 struct acpi_video_enumerated_device *active_list;
1183 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1184 union acpi_object *dod = NULL;
1185 union acpi_object *obj;
1186
1187 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1188 if (!ACPI_SUCCESS(status)) {
1189 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1190 return status;
1191 }
1192
1193 dod = buffer.pointer;
1194 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1195 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1196 status = -EFAULT;
1197 goto out;
1198 }
1199
1200 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1201 dod->package.count));
1202
1203 active_list = kcalloc(1 + dod->package.count,
1204 sizeof(struct acpi_video_enumerated_device),
1205 GFP_KERNEL);
1206 if (!active_list) {
1207 status = -ENOMEM;
1208 goto out;
1209 }
1210
1211 count = 0;
1212 for (i = 0; i < dod->package.count; i++) {
1213 obj = &dod->package.elements[i];
1214
1215 if (obj->type != ACPI_TYPE_INTEGER) {
1216 printk(KERN_ERR PREFIX
1217 "Invalid _DOD data in element %d\n", i);
1218 continue;
1219 }
1220
1221 active_list[count].value.int_val = obj->integer.value;
1222 active_list[count].bind_info = NULL;
1223 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1224 (int)obj->integer.value));
1225 count++;
1226 }
1227
1228 kfree(video->attached_array);
1229
1230 video->attached_array = active_list;
1231 video->attached_count = count;
1232
1233 out:
1234 kfree(buffer.pointer);
1235 return status;
1236 }
1237
1238 static int
1239 acpi_video_get_next_level(struct acpi_video_device *device,
1240 u32 level_current, u32 event)
1241 {
1242 int min, max, min_above, max_below, i, l, delta = 255;
1243 max = max_below = 0;
1244 min = min_above = 255;
1245 /* Find closest level to level_current */
1246 for (i = 2; i < device->brightness->count; i++) {
1247 l = device->brightness->levels[i];
1248 if (abs(l - level_current) < abs(delta)) {
1249 delta = l - level_current;
1250 if (!delta)
1251 break;
1252 }
1253 }
1254 /* Ajust level_current to closest available level */
1255 level_current += delta;
1256 for (i = 2; i < device->brightness->count; i++) {
1257 l = device->brightness->levels[i];
1258 if (l < min)
1259 min = l;
1260 if (l > max)
1261 max = l;
1262 if (l < min_above && l > level_current)
1263 min_above = l;
1264 if (l > max_below && l < level_current)
1265 max_below = l;
1266 }
1267
1268 switch (event) {
1269 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1270 return (level_current < max) ? min_above : min;
1271 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1272 return (level_current < max) ? min_above : max;
1273 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1274 return (level_current > min) ? max_below : min;
1275 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1276 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1277 return 0;
1278 default:
1279 return level_current;
1280 }
1281 }
1282
1283 static void
1284 acpi_video_switch_brightness(struct work_struct *work)
1285 {
1286 struct acpi_video_device *device = container_of(to_delayed_work(work),
1287 struct acpi_video_device, switch_brightness_work);
1288 unsigned long long level_current, level_next;
1289 int event = device->switch_brightness_event;
1290 int result = -EINVAL;
1291
1292 /* no warning message if acpi_backlight=vendor or a quirk is used */
1293 if (!acpi_video_verify_backlight_support())
1294 return;
1295
1296 if (!device->brightness)
1297 goto out;
1298
1299 result = acpi_video_device_lcd_get_level_current(device,
1300 &level_current,
1301 false);
1302 if (result)
1303 goto out;
1304
1305 level_next = acpi_video_get_next_level(device, level_current, event);
1306
1307 result = acpi_video_device_lcd_set_level(device, level_next);
1308
1309 if (!result)
1310 backlight_force_update(device->backlight,
1311 BACKLIGHT_UPDATE_HOTKEY);
1312
1313 out:
1314 if (result)
1315 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1316 }
1317
1318 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1319 void **edid)
1320 {
1321 struct acpi_video_bus *video;
1322 struct acpi_video_device *video_device;
1323 union acpi_object *buffer = NULL;
1324 acpi_status status;
1325 int i, length;
1326
1327 if (!device || !acpi_driver_data(device))
1328 return -EINVAL;
1329
1330 video = acpi_driver_data(device);
1331
1332 for (i = 0; i < video->attached_count; i++) {
1333 video_device = video->attached_array[i].bind_info;
1334 length = 256;
1335
1336 if (!video_device)
1337 continue;
1338
1339 if (!video_device->cap._DDC)
1340 continue;
1341
1342 if (type) {
1343 switch (type) {
1344 case ACPI_VIDEO_DISPLAY_CRT:
1345 if (!video_device->flags.crt)
1346 continue;
1347 break;
1348 case ACPI_VIDEO_DISPLAY_TV:
1349 if (!video_device->flags.tvout)
1350 continue;
1351 break;
1352 case ACPI_VIDEO_DISPLAY_DVI:
1353 if (!video_device->flags.dvi)
1354 continue;
1355 break;
1356 case ACPI_VIDEO_DISPLAY_LCD:
1357 if (!video_device->flags.lcd)
1358 continue;
1359 break;
1360 }
1361 } else if (video_device->device_id != device_id) {
1362 continue;
1363 }
1364
1365 status = acpi_video_device_EDID(video_device, &buffer, length);
1366
1367 if (ACPI_FAILURE(status) || !buffer ||
1368 buffer->type != ACPI_TYPE_BUFFER) {
1369 length = 128;
1370 status = acpi_video_device_EDID(video_device, &buffer,
1371 length);
1372 if (ACPI_FAILURE(status) || !buffer ||
1373 buffer->type != ACPI_TYPE_BUFFER) {
1374 continue;
1375 }
1376 }
1377
1378 *edid = buffer->buffer.pointer;
1379 return length;
1380 }
1381
1382 return -ENODEV;
1383 }
1384 EXPORT_SYMBOL(acpi_video_get_edid);
1385
1386 static int
1387 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1388 struct acpi_device *device)
1389 {
1390 int status = 0;
1391 struct acpi_device *dev;
1392
1393 /*
1394 * There are systems where video module known to work fine regardless
1395 * of broken _DOD and ignoring returned value here doesn't cause
1396 * any issues later.
1397 */
1398 acpi_video_device_enumerate(video);
1399
1400 list_for_each_entry(dev, &device->children, node) {
1401
1402 status = acpi_video_bus_get_one_device(dev, video);
1403 if (status) {
1404 dev_err(&dev->dev, "Can't attach device\n");
1405 break;
1406 }
1407 }
1408 return status;
1409 }
1410
1411 /* acpi_video interface */
1412
1413 /*
1414 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1415 * preform any automatic brightness change on receiving a notification.
1416 */
1417 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1418 {
1419 return acpi_video_bus_DOS(video, 0,
1420 acpi_osi_is_win8() ? 1 : 0);
1421 }
1422
1423 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1424 {
1425 return acpi_video_bus_DOS(video, 0,
1426 acpi_osi_is_win8() ? 0 : 1);
1427 }
1428
1429 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1430 {
1431 struct acpi_video_bus *video = acpi_driver_data(device);
1432 struct input_dev *input;
1433 int keycode = 0;
1434
1435 if (!video || !video->input)
1436 return;
1437
1438 input = video->input;
1439
1440 switch (event) {
1441 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1442 * most likely via hotkey. */
1443 keycode = KEY_SWITCHVIDEOMODE;
1444 break;
1445
1446 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1447 * connector. */
1448 acpi_video_device_enumerate(video);
1449 acpi_video_device_rebind(video);
1450 keycode = KEY_SWITCHVIDEOMODE;
1451 break;
1452
1453 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1454 keycode = KEY_SWITCHVIDEOMODE;
1455 break;
1456 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1457 keycode = KEY_VIDEO_NEXT;
1458 break;
1459 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1460 keycode = KEY_VIDEO_PREV;
1461 break;
1462
1463 default:
1464 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1465 "Unsupported event [0x%x]\n", event));
1466 break;
1467 }
1468
1469 if (acpi_notifier_call_chain(device, event, 0))
1470 /* Something vetoed the keypress. */
1471 keycode = 0;
1472
1473 if (keycode) {
1474 input_report_key(input, keycode, 1);
1475 input_sync(input);
1476 input_report_key(input, keycode, 0);
1477 input_sync(input);
1478 }
1479
1480 return;
1481 }
1482
1483 static void brightness_switch_event(struct acpi_video_device *video_device,
1484 u32 event)
1485 {
1486 if (!brightness_switch_enabled)
1487 return;
1488
1489 video_device->switch_brightness_event = event;
1490 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10);
1491 }
1492
1493 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1494 {
1495 struct acpi_video_device *video_device = data;
1496 struct acpi_device *device = NULL;
1497 struct acpi_video_bus *bus;
1498 struct input_dev *input;
1499 int keycode = 0;
1500
1501 if (!video_device)
1502 return;
1503
1504 device = video_device->dev;
1505 bus = video_device->video;
1506 input = bus->input;
1507
1508 switch (event) {
1509 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1510 brightness_switch_event(video_device, event);
1511 keycode = KEY_BRIGHTNESS_CYCLE;
1512 break;
1513 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1514 brightness_switch_event(video_device, event);
1515 keycode = KEY_BRIGHTNESSUP;
1516 break;
1517 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1518 brightness_switch_event(video_device, event);
1519 keycode = KEY_BRIGHTNESSDOWN;
1520 break;
1521 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1522 brightness_switch_event(video_device, event);
1523 keycode = KEY_BRIGHTNESS_ZERO;
1524 break;
1525 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1526 brightness_switch_event(video_device, event);
1527 keycode = KEY_DISPLAY_OFF;
1528 break;
1529 default:
1530 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1531 "Unsupported event [0x%x]\n", event));
1532 break;
1533 }
1534
1535 acpi_notifier_call_chain(device, event, 0);
1536
1537 if (keycode) {
1538 input_report_key(input, keycode, 1);
1539 input_sync(input);
1540 input_report_key(input, keycode, 0);
1541 input_sync(input);
1542 }
1543
1544 return;
1545 }
1546
1547 static int acpi_video_resume(struct notifier_block *nb,
1548 unsigned long val, void *ign)
1549 {
1550 struct acpi_video_bus *video;
1551 struct acpi_video_device *video_device;
1552 int i;
1553
1554 switch (val) {
1555 case PM_HIBERNATION_PREPARE:
1556 case PM_SUSPEND_PREPARE:
1557 case PM_RESTORE_PREPARE:
1558 return NOTIFY_DONE;
1559 }
1560
1561 video = container_of(nb, struct acpi_video_bus, pm_nb);
1562
1563 dev_info(&video->device->dev, "Restoring backlight state\n");
1564
1565 for (i = 0; i < video->attached_count; i++) {
1566 video_device = video->attached_array[i].bind_info;
1567 if (video_device && video_device->backlight)
1568 acpi_video_set_brightness(video_device->backlight);
1569 }
1570
1571 return NOTIFY_OK;
1572 }
1573
1574 static acpi_status
1575 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1576 void **return_value)
1577 {
1578 struct acpi_device *device = context;
1579 struct acpi_device *sibling;
1580 int result;
1581
1582 if (handle == device->handle)
1583 return AE_CTRL_TERMINATE;
1584
1585 result = acpi_bus_get_device(handle, &sibling);
1586 if (result)
1587 return AE_OK;
1588
1589 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1590 return AE_ALREADY_EXISTS;
1591
1592 return AE_OK;
1593 }
1594
1595 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1596 {
1597 struct backlight_properties props;
1598 struct pci_dev *pdev;
1599 acpi_handle acpi_parent;
1600 struct device *parent = NULL;
1601 int result;
1602 static int count;
1603 char *name;
1604
1605 /*
1606 * Do not create backlight device for video output
1607 * device that is not in the enumerated list.
1608 */
1609 if (!acpi_video_device_in_dod(device)) {
1610 dev_dbg(&device->dev->dev, "not in _DOD list, ignore\n");
1611 return;
1612 }
1613
1614 result = acpi_video_init_brightness(device);
1615 if (result)
1616 return;
1617 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1618 if (!name)
1619 return;
1620 count++;
1621
1622 acpi_get_parent(device->dev->handle, &acpi_parent);
1623
1624 pdev = acpi_get_pci_dev(acpi_parent);
1625 if (pdev) {
1626 parent = &pdev->dev;
1627 pci_dev_put(pdev);
1628 }
1629
1630 memset(&props, 0, sizeof(struct backlight_properties));
1631 props.type = BACKLIGHT_FIRMWARE;
1632 props.max_brightness = device->brightness->count - 3;
1633 device->backlight = backlight_device_register(name,
1634 parent,
1635 device,
1636 &acpi_backlight_ops,
1637 &props);
1638 kfree(name);
1639 if (IS_ERR(device->backlight))
1640 return;
1641
1642 /*
1643 * Save current brightness level in case we have to restore it
1644 * before acpi_video_device_lcd_set_level() is called next time.
1645 */
1646 device->backlight->props.brightness =
1647 acpi_video_get_brightness(device->backlight);
1648
1649 device->cooling_dev = thermal_cooling_device_register("LCD",
1650 device->dev, &video_cooling_ops);
1651 if (IS_ERR(device->cooling_dev)) {
1652 /*
1653 * Set cooling_dev to NULL so we don't crash trying to free it.
1654 * Also, why the hell we are returning early and not attempt to
1655 * register video output if cooling device registration failed?
1656 * -- dtor
1657 */
1658 device->cooling_dev = NULL;
1659 return;
1660 }
1661
1662 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1663 device->cooling_dev->id);
1664 result = sysfs_create_link(&device->dev->dev.kobj,
1665 &device->cooling_dev->device.kobj,
1666 "thermal_cooling");
1667 if (result)
1668 printk(KERN_ERR PREFIX "Create sysfs link\n");
1669 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1670 &device->dev->dev.kobj, "device");
1671 if (result)
1672 printk(KERN_ERR PREFIX "Create sysfs link\n");
1673 }
1674
1675 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1676 {
1677 struct acpi_video_device *dev;
1678
1679 if (video->backlight_registered)
1680 return 0;
1681
1682 if (!acpi_video_verify_backlight_support())
1683 return 0;
1684
1685 mutex_lock(&video->device_list_lock);
1686 list_for_each_entry(dev, &video->video_device_list, entry)
1687 acpi_video_dev_register_backlight(dev);
1688 mutex_unlock(&video->device_list_lock);
1689
1690 video->backlight_registered = true;
1691
1692 video->pm_nb.notifier_call = acpi_video_resume;
1693 video->pm_nb.priority = 0;
1694 return register_pm_notifier(&video->pm_nb);
1695 }
1696
1697 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1698 {
1699 if (device->backlight) {
1700 backlight_device_unregister(device->backlight);
1701 device->backlight = NULL;
1702 }
1703 if (device->brightness) {
1704 kfree(device->brightness->levels);
1705 kfree(device->brightness);
1706 device->brightness = NULL;
1707 }
1708 if (device->cooling_dev) {
1709 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1710 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1711 thermal_cooling_device_unregister(device->cooling_dev);
1712 device->cooling_dev = NULL;
1713 }
1714 }
1715
1716 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1717 {
1718 struct acpi_video_device *dev;
1719 int error;
1720
1721 if (!video->backlight_registered)
1722 return 0;
1723
1724 error = unregister_pm_notifier(&video->pm_nb);
1725
1726 mutex_lock(&video->device_list_lock);
1727 list_for_each_entry(dev, &video->video_device_list, entry)
1728 acpi_video_dev_unregister_backlight(dev);
1729 mutex_unlock(&video->device_list_lock);
1730
1731 video->backlight_registered = false;
1732
1733 return error;
1734 }
1735
1736 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1737 {
1738 acpi_status status;
1739 struct acpi_device *adev = device->dev;
1740
1741 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1742 acpi_video_device_notify, device);
1743 if (ACPI_FAILURE(status))
1744 dev_err(&adev->dev, "Error installing notify handler\n");
1745 else
1746 device->flags.notify = 1;
1747 }
1748
1749 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1750 {
1751 struct input_dev *input;
1752 struct acpi_video_device *dev;
1753 int error;
1754
1755 video->input = input = input_allocate_device();
1756 if (!input) {
1757 error = -ENOMEM;
1758 goto out;
1759 }
1760
1761 error = acpi_video_bus_start_devices(video);
1762 if (error)
1763 goto err_free_input;
1764
1765 snprintf(video->phys, sizeof(video->phys),
1766 "%s/video/input0", acpi_device_hid(video->device));
1767
1768 input->name = acpi_device_name(video->device);
1769 input->phys = video->phys;
1770 input->id.bustype = BUS_HOST;
1771 input->id.product = 0x06;
1772 input->dev.parent = &video->device->dev;
1773 input->evbit[0] = BIT(EV_KEY);
1774 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1775 set_bit(KEY_VIDEO_NEXT, input->keybit);
1776 set_bit(KEY_VIDEO_PREV, input->keybit);
1777 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1778 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1779 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1780 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1781 set_bit(KEY_DISPLAY_OFF, input->keybit);
1782
1783 error = input_register_device(input);
1784 if (error)
1785 goto err_stop_dev;
1786
1787 mutex_lock(&video->device_list_lock);
1788 list_for_each_entry(dev, &video->video_device_list, entry)
1789 acpi_video_dev_add_notify_handler(dev);
1790 mutex_unlock(&video->device_list_lock);
1791
1792 return 0;
1793
1794 err_stop_dev:
1795 acpi_video_bus_stop_devices(video);
1796 err_free_input:
1797 input_free_device(input);
1798 video->input = NULL;
1799 out:
1800 return error;
1801 }
1802
1803 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1804 {
1805 if (dev->flags.notify) {
1806 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1807 acpi_video_device_notify);
1808 dev->flags.notify = 0;
1809 }
1810 }
1811
1812 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1813 {
1814 struct acpi_video_device *dev;
1815
1816 mutex_lock(&video->device_list_lock);
1817 list_for_each_entry(dev, &video->video_device_list, entry)
1818 acpi_video_dev_remove_notify_handler(dev);
1819 mutex_unlock(&video->device_list_lock);
1820
1821 acpi_video_bus_stop_devices(video);
1822 input_unregister_device(video->input);
1823 video->input = NULL;
1824 }
1825
1826 static int acpi_video_backlight_notify(struct notifier_block *nb,
1827 unsigned long val, void *bd)
1828 {
1829 struct backlight_device *backlight = bd;
1830 struct acpi_video_bus *video;
1831
1832 /* acpi_video_verify_backlight_support only cares about raw devices */
1833 if (backlight->props.type != BACKLIGHT_RAW)
1834 return NOTIFY_DONE;
1835
1836 video = container_of(nb, struct acpi_video_bus, backlight_nb);
1837
1838 switch (val) {
1839 case BACKLIGHT_REGISTERED:
1840 if (!acpi_video_verify_backlight_support())
1841 acpi_video_bus_unregister_backlight(video);
1842 break;
1843 case BACKLIGHT_UNREGISTERED:
1844 acpi_video_bus_register_backlight(video);
1845 break;
1846 }
1847
1848 return NOTIFY_OK;
1849 }
1850
1851 static int acpi_video_bus_add_backlight_notify_handler(
1852 struct acpi_video_bus *video)
1853 {
1854 int error;
1855
1856 video->backlight_nb.notifier_call = acpi_video_backlight_notify;
1857 video->backlight_nb.priority = 0;
1858 error = backlight_register_notifier(&video->backlight_nb);
1859 if (error == 0)
1860 video->backlight_notifier_registered = true;
1861
1862 return error;
1863 }
1864
1865 static int acpi_video_bus_remove_backlight_notify_handler(
1866 struct acpi_video_bus *video)
1867 {
1868 if (!video->backlight_notifier_registered)
1869 return 0;
1870
1871 video->backlight_notifier_registered = false;
1872
1873 return backlight_unregister_notifier(&video->backlight_nb);
1874 }
1875
1876 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1877 {
1878 struct acpi_video_device *dev, *next;
1879
1880 mutex_lock(&video->device_list_lock);
1881 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1882 list_del(&dev->entry);
1883 kfree(dev);
1884 }
1885 mutex_unlock(&video->device_list_lock);
1886
1887 return 0;
1888 }
1889
1890 static int instance;
1891
1892 static int acpi_video_bus_add(struct acpi_device *device)
1893 {
1894 struct acpi_video_bus *video;
1895 int error;
1896 acpi_status status;
1897
1898 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1899 device->parent->handle, 1,
1900 acpi_video_bus_match, NULL,
1901 device, NULL);
1902 if (status == AE_ALREADY_EXISTS) {
1903 printk(KERN_WARNING FW_BUG
1904 "Duplicate ACPI video bus devices for the"
1905 " same VGA controller, please try module "
1906 "parameter \"video.allow_duplicates=1\""
1907 "if the current driver doesn't work.\n");
1908 if (!allow_duplicates)
1909 return -ENODEV;
1910 }
1911
1912 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1913 if (!video)
1914 return -ENOMEM;
1915
1916 /* a hack to fix the duplicate name "VID" problem on T61 */
1917 if (!strcmp(device->pnp.bus_id, "VID")) {
1918 if (instance)
1919 device->pnp.bus_id[3] = '0' + instance;
1920 instance++;
1921 }
1922 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1923 if (!strcmp(device->pnp.bus_id, "VGA")) {
1924 if (instance)
1925 device->pnp.bus_id[3] = '0' + instance;
1926 instance++;
1927 }
1928
1929 video->device = device;
1930 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1931 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1932 device->driver_data = video;
1933
1934 acpi_video_bus_find_cap(video);
1935 error = acpi_video_bus_check(video);
1936 if (error)
1937 goto err_free_video;
1938
1939 mutex_init(&video->device_list_lock);
1940 INIT_LIST_HEAD(&video->video_device_list);
1941
1942 error = acpi_video_bus_get_devices(video, device);
1943 if (error)
1944 goto err_put_video;
1945
1946 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
1947 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1948 video->flags.multihead ? "yes" : "no",
1949 video->flags.rom ? "yes" : "no",
1950 video->flags.post ? "yes" : "no");
1951 mutex_lock(&video_list_lock);
1952 list_add_tail(&video->entry, &video_bus_head);
1953 mutex_unlock(&video_list_lock);
1954
1955 acpi_video_bus_register_backlight(video);
1956 acpi_video_bus_add_notify_handler(video);
1957 acpi_video_bus_add_backlight_notify_handler(video);
1958
1959 return 0;
1960
1961 err_put_video:
1962 acpi_video_bus_put_devices(video);
1963 kfree(video->attached_array);
1964 err_free_video:
1965 kfree(video);
1966 device->driver_data = NULL;
1967
1968 return error;
1969 }
1970
1971 static int acpi_video_bus_remove(struct acpi_device *device)
1972 {
1973 struct acpi_video_bus *video = NULL;
1974
1975
1976 if (!device || !acpi_driver_data(device))
1977 return -EINVAL;
1978
1979 video = acpi_driver_data(device);
1980
1981 acpi_video_bus_remove_backlight_notify_handler(video);
1982 acpi_video_bus_remove_notify_handler(video);
1983 acpi_video_bus_unregister_backlight(video);
1984 acpi_video_bus_put_devices(video);
1985
1986 mutex_lock(&video_list_lock);
1987 list_del(&video->entry);
1988 mutex_unlock(&video_list_lock);
1989
1990 kfree(video->attached_array);
1991 kfree(video);
1992
1993 return 0;
1994 }
1995
1996 static int __init is_i740(struct pci_dev *dev)
1997 {
1998 if (dev->device == 0x00D1)
1999 return 1;
2000 if (dev->device == 0x7000)
2001 return 1;
2002 return 0;
2003 }
2004
2005 static int __init intel_opregion_present(void)
2006 {
2007 int opregion = 0;
2008 struct pci_dev *dev = NULL;
2009 u32 address;
2010
2011 for_each_pci_dev(dev) {
2012 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2013 continue;
2014 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2015 continue;
2016 /* We don't want to poke around undefined i740 registers */
2017 if (is_i740(dev))
2018 continue;
2019 pci_read_config_dword(dev, 0xfc, &address);
2020 if (!address)
2021 continue;
2022 opregion = 1;
2023 }
2024 return opregion;
2025 }
2026
2027 int acpi_video_register(void)
2028 {
2029 int result = 0;
2030 if (register_count) {
2031 /*
2032 * if the function of acpi_video_register is already called,
2033 * don't register the acpi_vide_bus again and return no error.
2034 */
2035 return 0;
2036 }
2037
2038 mutex_init(&video_list_lock);
2039 INIT_LIST_HEAD(&video_bus_head);
2040
2041 result = acpi_bus_register_driver(&acpi_video_bus);
2042 if (result < 0)
2043 return -ENODEV;
2044
2045 /*
2046 * When the acpi_video_bus is loaded successfully, increase
2047 * the counter reference.
2048 */
2049 register_count = 1;
2050
2051 return 0;
2052 }
2053 EXPORT_SYMBOL(acpi_video_register);
2054
2055 void acpi_video_unregister(void)
2056 {
2057 if (!register_count) {
2058 /*
2059 * If the acpi video bus is already unloaded, don't
2060 * unload it again and return directly.
2061 */
2062 return;
2063 }
2064 acpi_bus_unregister_driver(&acpi_video_bus);
2065
2066 register_count = 0;
2067
2068 return;
2069 }
2070 EXPORT_SYMBOL(acpi_video_unregister);
2071
2072 void acpi_video_unregister_backlight(void)
2073 {
2074 struct acpi_video_bus *video;
2075
2076 if (!register_count)
2077 return;
2078
2079 mutex_lock(&video_list_lock);
2080 list_for_each_entry(video, &video_bus_head, entry)
2081 acpi_video_bus_unregister_backlight(video);
2082 mutex_unlock(&video_list_lock);
2083 }
2084 EXPORT_SYMBOL(acpi_video_unregister_backlight);
2085
2086 /*
2087 * This is kind of nasty. Hardware using Intel chipsets may require
2088 * the video opregion code to be run first in order to initialise
2089 * state before any ACPI video calls are made. To handle this we defer
2090 * registration of the video class until the opregion code has run.
2091 */
2092
2093 static int __init acpi_video_init(void)
2094 {
2095 dmi_check_system(video_dmi_table);
2096
2097 if (intel_opregion_present())
2098 return 0;
2099
2100 return acpi_video_register();
2101 }
2102
2103 static void __exit acpi_video_exit(void)
2104 {
2105 acpi_video_unregister();
2106
2107 return;
2108 }
2109
2110 module_init(acpi_video_init);
2111 module_exit(acpi_video_exit);
Linux kernel - Deliverables
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