projects / deliverable / linux.git / blame_incremental
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (non-incremental) | history | HEAD
Linux 3.19-rc3
[deliverable/linux.git] / drivers / acpi / video.c
... / ...
CommitLineData
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
65ACPI_MODULE_NAME("video");
66
67MODULE_AUTHOR("Bruno Ducrot");
68MODULE_DESCRIPTION("ACPI Video Driver");
69MODULE_LICENSE("GPL");
70
71static bool brightness_switch_enabled = 1;
72module_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 */
78static bool allow_duplicates;
79module_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 */
85static int use_native_backlight_param = -1;
86module_param_named(use_native_backlight, use_native_backlight_param, int, 0444);
87static bool use_native_backlight_dmi = true;
88
89static int register_count;
90static struct mutex video_list_lock;
91static struct list_head video_bus_head;
92static int acpi_video_bus_add(struct acpi_device *device);
93static int acpi_video_bus_remove(struct acpi_device *device);
94static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
95
96static const struct acpi_device_id video_device_ids[] = {
97 {ACPI_VIDEO_HID, 0},
98 {"", 0},
99};
100MODULE_DEVICE_TABLE(acpi, video_device_ids);
101
102static 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
113struct 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
120struct 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
130struct 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
143struct 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
151struct 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 u8 child_count;
159 struct acpi_video_bus_cap cap;
160 struct acpi_video_bus_flags flags;
161 struct list_head video_device_list;
162 struct mutex device_list_lock; /* protects video_device_list */
163 struct list_head entry;
164 struct input_dev *input;
165 char phys[32]; /* for input device */
166 struct notifier_block pm_nb;
167 struct notifier_block backlight_nb;
168};
169
170struct acpi_video_device_flags {
171 u8 crt:1;
172 u8 lcd:1;
173 u8 tvout:1;
174 u8 dvi:1;
175 u8 bios:1;
176 u8 unknown:1;
177 u8 notify:1;
178 u8 reserved:1;
179};
180
181struct acpi_video_device_cap {
182 u8 _ADR:1; /* Return the unique ID */
183 u8 _BCL:1; /* Query list of brightness control levels supported */
184 u8 _BCM:1; /* Set the brightness level */
185 u8 _BQC:1; /* Get current brightness level */
186 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
187 u8 _DDC:1; /* Return the EDID for this device */
188};
189
190struct acpi_video_brightness_flags {
191 u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
192 u8 _BCL_reversed:1; /* _BCL package is in a reversed order */
193 u8 _BQC_use_index:1; /* _BQC returns an index value */
194};
195
196struct acpi_video_device_brightness {
197 int curr;
198 int count;
199 int *levels;
200 struct acpi_video_brightness_flags flags;
201};
202
203struct acpi_video_device {
204 unsigned long device_id;
205 struct acpi_video_device_flags flags;
206 struct acpi_video_device_cap cap;
207 struct list_head entry;
208 struct delayed_work switch_brightness_work;
209 int switch_brightness_event;
210 struct acpi_video_bus *video;
211 struct acpi_device *dev;
212 struct acpi_video_device_brightness *brightness;
213 struct backlight_device *backlight;
214 struct thermal_cooling_device *cooling_dev;
215};
216
217static const char device_decode[][30] = {
218 "motherboard VGA device",
219 "PCI VGA device",
220 "AGP VGA device",
221 "UNKNOWN",
222};
223
224static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
225static void acpi_video_device_rebind(struct acpi_video_bus *video);
226static void acpi_video_device_bind(struct acpi_video_bus *video,
227 struct acpi_video_device *device);
228static int acpi_video_device_enumerate(struct acpi_video_bus *video);
229static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
230 int level);
231static int acpi_video_device_lcd_get_level_current(
232 struct acpi_video_device *device,
233 unsigned long long *level, bool raw);
234static int acpi_video_get_next_level(struct acpi_video_device *device,
235 u32 level_current, u32 event);
236static void acpi_video_switch_brightness(struct work_struct *work);
237
238static bool acpi_video_use_native_backlight(void)
239{
240 if (use_native_backlight_param != -1)
241 return use_native_backlight_param;
242 else
243 return use_native_backlight_dmi;
244}
245
246bool acpi_video_verify_backlight_support(void)
247{
248 if (acpi_osi_is_win8() && acpi_video_use_native_backlight() &&
249 backlight_device_registered(BACKLIGHT_RAW))
250 return false;
251 return acpi_video_backlight_support();
252}
253EXPORT_SYMBOL_GPL(acpi_video_verify_backlight_support);
254
255/* backlight device sysfs support */
256static int acpi_video_get_brightness(struct backlight_device *bd)
257{
258 unsigned long long cur_level;
259 int i;
260 struct acpi_video_device *vd = bl_get_data(bd);
261
262 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
263 return -EINVAL;
264 for (i = 2; i < vd->brightness->count; i++) {
265 if (vd->brightness->levels[i] == cur_level)
266 /*
267 * The first two entries are special - see page 575
268 * of the ACPI spec 3.0
269 */
270 return i - 2;
271 }
272 return 0;
273}
274
275static int acpi_video_set_brightness(struct backlight_device *bd)
276{
277 int request_level = bd->props.brightness + 2;
278 struct acpi_video_device *vd = bl_get_data(bd);
279
280 cancel_delayed_work(&vd->switch_brightness_work);
281 return acpi_video_device_lcd_set_level(vd,
282 vd->brightness->levels[request_level]);
283}
284
285static const struct backlight_ops acpi_backlight_ops = {
286 .get_brightness = acpi_video_get_brightness,
287 .update_status = acpi_video_set_brightness,
288};
289
290/* thermal cooling device callbacks */
291static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
292 long *state)
293{
294 struct acpi_device *device = cooling_dev->devdata;
295 struct acpi_video_device *video = acpi_driver_data(device);
296
297 *state = video->brightness->count - 3;
298 return 0;
299}
300
301static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
302 long *state)
303{
304 struct acpi_device *device = cooling_dev->devdata;
305 struct acpi_video_device *video = acpi_driver_data(device);
306 unsigned long long level;
307 int offset;
308
309 if (acpi_video_device_lcd_get_level_current(video, &level, false))
310 return -EINVAL;
311 for (offset = 2; offset < video->brightness->count; offset++)
312 if (level == video->brightness->levels[offset]) {
313 *state = video->brightness->count - offset - 1;
314 return 0;
315 }
316
317 return -EINVAL;
318}
319
320static int
321video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
322{
323 struct acpi_device *device = cooling_dev->devdata;
324 struct acpi_video_device *video = acpi_driver_data(device);
325 int level;
326
327 if (state >= video->brightness->count - 2)
328 return -EINVAL;
329
330 state = video->brightness->count - state;
331 level = video->brightness->levels[state - 1];
332 return acpi_video_device_lcd_set_level(video, level);
333}
334
335static const struct thermal_cooling_device_ops video_cooling_ops = {
336 .get_max_state = video_get_max_state,
337 .get_cur_state = video_get_cur_state,
338 .set_cur_state = video_set_cur_state,
339};
340
341/*
342 * --------------------------------------------------------------------------
343 * Video Management
344 * --------------------------------------------------------------------------
345 */
346
347static int
348acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
349 union acpi_object **levels)
350{
351 int status;
352 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
353 union acpi_object *obj;
354
355
356 *levels = NULL;
357
358 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
359 if (!ACPI_SUCCESS(status))
360 return status;
361 obj = (union acpi_object *)buffer.pointer;
362 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
363 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
364 status = -EFAULT;
365 goto err;
366 }
367
368 *levels = obj;
369
370 return 0;
371
372err:
373 kfree(buffer.pointer);
374
375 return status;
376}
377
378static int
379acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
380{
381 int status;
382 int state;
383
384 status = acpi_execute_simple_method(device->dev->handle,
385 "_BCM", level);
386 if (ACPI_FAILURE(status)) {
387 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
388 return -EIO;
389 }
390
391 device->brightness->curr = level;
392 for (state = 2; state < device->brightness->count; state++)
393 if (level == device->brightness->levels[state]) {
394 if (device->backlight)
395 device->backlight->props.brightness = state - 2;
396 return 0;
397 }
398
399 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
400 return -EINVAL;
401}
402
403/*
404 * For some buggy _BQC methods, we need to add a constant value to
405 * the _BQC return value to get the actual current brightness level
406 */
407
408static int bqc_offset_aml_bug_workaround;
409static int __init video_set_bqc_offset(const struct dmi_system_id *d)
410{
411 bqc_offset_aml_bug_workaround = 9;
412 return 0;
413}
414
415static int __init video_disable_native_backlight(const struct dmi_system_id *d)
416{
417 use_native_backlight_dmi = false;
418 return 0;
419}
420
421static struct dmi_system_id video_dmi_table[] __initdata = {
422 /*
423 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
424 */
425 {
426 .callback = video_set_bqc_offset,
427 .ident = "Acer Aspire 5720",
428 .matches = {
429 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
430 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
431 },
432 },
433 {
434 .callback = video_set_bqc_offset,
435 .ident = "Acer Aspire 5710Z",
436 .matches = {
437 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
438 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
439 },
440 },
441 {
442 .callback = video_set_bqc_offset,
443 .ident = "eMachines E510",
444 .matches = {
445 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
446 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
447 },
448 },
449 {
450 .callback = video_set_bqc_offset,
451 .ident = "Acer Aspire 5315",
452 .matches = {
453 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
454 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
455 },
456 },
457 {
458 .callback = video_set_bqc_offset,
459 .ident = "Acer Aspire 7720",
460 .matches = {
461 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
462 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
463 },
464 },
465
466 /*
467 * These models have a working acpi_video backlight control, and using
468 * native backlight causes a regression where backlight does not work
469 * when userspace is not handling brightness key events. Disable
470 * native_backlight on these to fix this:
471 * https://bugzilla.kernel.org/show_bug.cgi?id=81691
472 */
473 {
474 .callback = video_disable_native_backlight,
475 .ident = "ThinkPad T420",
476 .matches = {
477 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
478 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
479 },
480 },
481 {
482 .callback = video_disable_native_backlight,
483 .ident = "ThinkPad T520",
484 .matches = {
485 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
486 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
487 },
488 },
489 {
490 .callback = video_disable_native_backlight,
491 .ident = "ThinkPad X201s",
492 .matches = {
493 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
494 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
495 },
496 },
497
498 /* The native backlight controls do not work on some older machines */
499 {
500 /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
501 .callback = video_disable_native_backlight,
502 .ident = "HP ENVY 15 Notebook",
503 .matches = {
504 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
505 DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
506 },
507 },
508
509 {
510 .callback = video_disable_native_backlight,
511 .ident = "SAMSUNG 870Z5E/880Z5E/680Z5E",
512 .matches = {
513 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
514 DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"),
515 },
516 },
517 {
518 .callback = video_disable_native_backlight,
519 .ident = "SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V",
520 .matches = {
521 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
522 DMI_MATCH(DMI_PRODUCT_NAME, "370R4E/370R4V/370R5E/3570RE/370R5V"),
523 },
524 },
525 {}
526};
527
528static unsigned long long
529acpi_video_bqc_value_to_level(struct acpi_video_device *device,
530 unsigned long long bqc_value)
531{
532 unsigned long long level;
533
534 if (device->brightness->flags._BQC_use_index) {
535 /*
536 * _BQC returns an index that doesn't account for
537 * the first 2 items with special meaning, so we need
538 * to compensate for that by offsetting ourselves
539 */
540 if (device->brightness->flags._BCL_reversed)
541 bqc_value = device->brightness->count - 3 - bqc_value;
542
543 level = device->brightness->levels[bqc_value + 2];
544 } else {
545 level = bqc_value;
546 }
547
548 level += bqc_offset_aml_bug_workaround;
549
550 return level;
551}
552
553static int
554acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
555 unsigned long long *level, bool raw)
556{
557 acpi_status status = AE_OK;
558 int i;
559
560 if (device->cap._BQC || device->cap._BCQ) {
561 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
562
563 status = acpi_evaluate_integer(device->dev->handle, buf,
564 NULL, level);
565 if (ACPI_SUCCESS(status)) {
566 if (raw) {
567 /*
568 * Caller has indicated he wants the raw
569 * value returned by _BQC, so don't furtherly
570 * mess with the value.
571 */
572 return 0;
573 }
574
575 *level = acpi_video_bqc_value_to_level(device, *level);
576
577 for (i = 2; i < device->brightness->count; i++)
578 if (device->brightness->levels[i] == *level) {
579 device->brightness->curr = *level;
580 return 0;
581 }
582 /*
583 * BQC returned an invalid level.
584 * Stop using it.
585 */
586 ACPI_WARNING((AE_INFO,
587 "%s returned an invalid level",
588 buf));
589 device->cap._BQC = device->cap._BCQ = 0;
590 } else {
591 /*
592 * Fixme:
593 * should we return an error or ignore this failure?
594 * dev->brightness->curr is a cached value which stores
595 * the correct current backlight level in most cases.
596 * ACPI video backlight still works w/ buggy _BQC.
597 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
598 */
599 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
600 device->cap._BQC = device->cap._BCQ = 0;
601 }
602 }
603
604 *level = device->brightness->curr;
605 return 0;
606}
607
608static int
609acpi_video_device_EDID(struct acpi_video_device *device,
610 union acpi_object **edid, ssize_t length)
611{
612 int status;
613 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
614 union acpi_object *obj;
615 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
616 struct acpi_object_list args = { 1, &arg0 };
617
618
619 *edid = NULL;
620
621 if (!device)
622 return -ENODEV;
623 if (length == 128)
624 arg0.integer.value = 1;
625 else if (length == 256)
626 arg0.integer.value = 2;
627 else
628 return -EINVAL;
629
630 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
631 if (ACPI_FAILURE(status))
632 return -ENODEV;
633
634 obj = buffer.pointer;
635
636 if (obj && obj->type == ACPI_TYPE_BUFFER)
637 *edid = obj;
638 else {
639 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
640 status = -EFAULT;
641 kfree(obj);
642 }
643
644 return status;
645}
646
647/* bus */
648
649/*
650 * Arg:
651 * video : video bus device pointer
652 * bios_flag :
653 * 0. The system BIOS should NOT automatically switch(toggle)
654 * the active display output.
655 * 1. The system BIOS should automatically switch (toggle) the
656 * active display output. No switch event.
657 * 2. The _DGS value should be locked.
658 * 3. The system BIOS should not automatically switch (toggle) the
659 * active display output, but instead generate the display switch
660 * event notify code.
661 * lcd_flag :
662 * 0. The system BIOS should automatically control the brightness level
663 * of the LCD when the power changes from AC to DC
664 * 1. The system BIOS should NOT automatically control the brightness
665 * level of the LCD when the power changes from AC to DC.
666 * Return Value:
667 * -EINVAL wrong arg.
668 */
669
670static int
671acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
672{
673 acpi_status status;
674
675 if (!video->cap._DOS)
676 return 0;
677
678 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
679 return -EINVAL;
680 video->dos_setting = (lcd_flag << 2) | bios_flag;
681 status = acpi_execute_simple_method(video->device->handle, "_DOS",
682 (lcd_flag << 2) | bios_flag);
683 if (ACPI_FAILURE(status))
684 return -EIO;
685
686 return 0;
687}
688
689/*
690 * Simple comparison function used to sort backlight levels.
691 */
692
693static int
694acpi_video_cmp_level(const void *a, const void *b)
695{
696 return *(int *)a - *(int *)b;
697}
698
699/*
700 * Decides if _BQC/_BCQ for this system is usable
701 *
702 * We do this by changing the level first and then read out the current
703 * brightness level, if the value does not match, find out if it is using
704 * index. If not, clear the _BQC/_BCQ capability.
705 */
706static int acpi_video_bqc_quirk(struct acpi_video_device *device,
707 int max_level, int current_level)
708{
709 struct acpi_video_device_brightness *br = device->brightness;
710 int result;
711 unsigned long long level;
712 int test_level;
713
714 /* don't mess with existing known broken systems */
715 if (bqc_offset_aml_bug_workaround)
716 return 0;
717
718 /*
719 * Some systems always report current brightness level as maximum
720 * through _BQC, we need to test another value for them.
721 */
722 test_level = current_level == max_level ? br->levels[3] : max_level;
723
724 result = acpi_video_device_lcd_set_level(device, test_level);
725 if (result)
726 return result;
727
728 result = acpi_video_device_lcd_get_level_current(device, &level, true);
729 if (result)
730 return result;
731
732 if (level != test_level) {
733 /* buggy _BQC found, need to find out if it uses index */
734 if (level < br->count) {
735 if (br->flags._BCL_reversed)
736 level = br->count - 3 - level;
737 if (br->levels[level + 2] == test_level)
738 br->flags._BQC_use_index = 1;
739 }
740
741 if (!br->flags._BQC_use_index)
742 device->cap._BQC = device->cap._BCQ = 0;
743 }
744
745 return 0;
746}
747
748
749/*
750 * Arg:
751 * device : video output device (LCD, CRT, ..)
752 *
753 * Return Value:
754 * Maximum brightness level
755 *
756 * Allocate and initialize device->brightness.
757 */
758
759static int
760acpi_video_init_brightness(struct acpi_video_device *device)
761{
762 union acpi_object *obj = NULL;
763 int i, max_level = 0, count = 0, level_ac_battery = 0;
764 unsigned long long level, level_old;
765 union acpi_object *o;
766 struct acpi_video_device_brightness *br = NULL;
767 int result = -EINVAL;
768 u32 value;
769
770 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
771 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
772 "LCD brightness level\n"));
773 goto out;
774 }
775
776 if (obj->package.count < 2)
777 goto out;
778
779 br = kzalloc(sizeof(*br), GFP_KERNEL);
780 if (!br) {
781 printk(KERN_ERR "can't allocate memory\n");
782 result = -ENOMEM;
783 goto out;
784 }
785
786 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
787 GFP_KERNEL);
788 if (!br->levels) {
789 result = -ENOMEM;
790 goto out_free;
791 }
792
793 for (i = 0; i < obj->package.count; i++) {
794 o = (union acpi_object *)&obj->package.elements[i];
795 if (o->type != ACPI_TYPE_INTEGER) {
796 printk(KERN_ERR PREFIX "Invalid data\n");
797 continue;
798 }
799 value = (u32) o->integer.value;
800 /* Skip duplicate entries */
801 if (count > 2 && br->levels[count - 1] == value)
802 continue;
803
804 br->levels[count] = value;
805
806 if (br->levels[count] > max_level)
807 max_level = br->levels[count];
808 count++;
809 }
810
811 /*
812 * some buggy BIOS don't export the levels
813 * when machine is on AC/Battery in _BCL package.
814 * In this case, the first two elements in _BCL packages
815 * are also supported brightness levels that OS should take care of.
816 */
817 for (i = 2; i < count; i++) {
818 if (br->levels[i] == br->levels[0])
819 level_ac_battery++;
820 if (br->levels[i] == br->levels[1])
821 level_ac_battery++;
822 }
823
824 if (level_ac_battery < 2) {
825 level_ac_battery = 2 - level_ac_battery;
826 br->flags._BCL_no_ac_battery_levels = 1;
827 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
828 br->levels[i] = br->levels[i - level_ac_battery];
829 count += level_ac_battery;
830 } else if (level_ac_battery > 2)
831 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
832
833 /* Check if the _BCL package is in a reversed order */
834 if (max_level == br->levels[2]) {
835 br->flags._BCL_reversed = 1;
836 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
837 acpi_video_cmp_level, NULL);
838 } else if (max_level != br->levels[count - 1])
839 ACPI_ERROR((AE_INFO,
840 "Found unordered _BCL package"));
841
842 br->count = count;
843 device->brightness = br;
844
845 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
846 br->curr = level = max_level;
847
848 if (!device->cap._BQC)
849 goto set_level;
850
851 result = acpi_video_device_lcd_get_level_current(device,
852 &level_old, true);
853 if (result)
854 goto out_free_levels;
855
856 result = acpi_video_bqc_quirk(device, max_level, level_old);
857 if (result)
858 goto out_free_levels;
859 /*
860 * cap._BQC may get cleared due to _BQC is found to be broken
861 * in acpi_video_bqc_quirk, so check again here.
862 */
863 if (!device->cap._BQC)
864 goto set_level;
865
866 level = acpi_video_bqc_value_to_level(device, level_old);
867 /*
868 * On some buggy laptops, _BQC returns an uninitialized
869 * value when invoked for the first time, i.e.
870 * level_old is invalid (no matter whether it's a level
871 * or an index). Set the backlight to max_level in this case.
872 */
873 for (i = 2; i < br->count; i++)
874 if (level == br->levels[i])
875 break;
876 if (i == br->count || !level)
877 level = max_level;
878
879set_level:
880 result = acpi_video_device_lcd_set_level(device, level);
881 if (result)
882 goto out_free_levels;
883
884 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
885 "found %d brightness levels\n", count - 2));
886 kfree(obj);
887 return result;
888
889out_free_levels:
890 kfree(br->levels);
891out_free:
892 kfree(br);
893out:
894 device->brightness = NULL;
895 kfree(obj);
896 return result;
897}
898
899/*
900 * Arg:
901 * device : video output device (LCD, CRT, ..)
902 *
903 * Return Value:
904 * None
905 *
906 * Find out all required AML methods defined under the output
907 * device.
908 */
909
910static void acpi_video_device_find_cap(struct acpi_video_device *device)
911{
912 if (acpi_has_method(device->dev->handle, "_ADR"))
913 device->cap._ADR = 1;
914 if (acpi_has_method(device->dev->handle, "_BCL"))
915 device->cap._BCL = 1;
916 if (acpi_has_method(device->dev->handle, "_BCM"))
917 device->cap._BCM = 1;
918 if (acpi_has_method(device->dev->handle, "_BQC")) {
919 device->cap._BQC = 1;
920 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
921 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
922 device->cap._BCQ = 1;
923 }
924
925 if (acpi_has_method(device->dev->handle, "_DDC"))
926 device->cap._DDC = 1;
927}
928
929/*
930 * Arg:
931 * device : video output device (VGA)
932 *
933 * Return Value:
934 * None
935 *
936 * Find out all required AML methods defined under the video bus device.
937 */
938
939static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
940{
941 if (acpi_has_method(video->device->handle, "_DOS"))
942 video->cap._DOS = 1;
943 if (acpi_has_method(video->device->handle, "_DOD"))
944 video->cap._DOD = 1;
945 if (acpi_has_method(video->device->handle, "_ROM"))
946 video->cap._ROM = 1;
947 if (acpi_has_method(video->device->handle, "_GPD"))
948 video->cap._GPD = 1;
949 if (acpi_has_method(video->device->handle, "_SPD"))
950 video->cap._SPD = 1;
951 if (acpi_has_method(video->device->handle, "_VPO"))
952 video->cap._VPO = 1;
953}
954
955/*
956 * Check whether the video bus device has required AML method to
957 * support the desired features
958 */
959
960static int acpi_video_bus_check(struct acpi_video_bus *video)
961{
962 acpi_status status = -ENOENT;
963 struct pci_dev *dev;
964
965 if (!video)
966 return -EINVAL;
967
968 dev = acpi_get_pci_dev(video->device->handle);
969 if (!dev)
970 return -ENODEV;
971 pci_dev_put(dev);
972
973 /*
974 * Since there is no HID, CID and so on for VGA driver, we have
975 * to check well known required nodes.
976 */
977
978 /* Does this device support video switching? */
979 if (video->cap._DOS || video->cap._DOD) {
980 if (!video->cap._DOS) {
981 printk(KERN_WARNING FW_BUG
982 "ACPI(%s) defines _DOD but not _DOS\n",
983 acpi_device_bid(video->device));
984 }
985 video->flags.multihead = 1;
986 status = 0;
987 }
988
989 /* Does this device support retrieving a video ROM? */
990 if (video->cap._ROM) {
991 video->flags.rom = 1;
992 status = 0;
993 }
994
995 /* Does this device support configuring which video device to POST? */
996 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
997 video->flags.post = 1;
998 status = 0;
999 }
1000
1001 return status;
1002}
1003
1004/*
1005 * --------------------------------------------------------------------------
1006 * Driver Interface
1007 * --------------------------------------------------------------------------
1008 */
1009
1010/* device interface */
1011static struct acpi_video_device_attrib *
1012acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1013{
1014 struct acpi_video_enumerated_device *ids;
1015 int i;
1016
1017 for (i = 0; i < video->attached_count; i++) {
1018 ids = &video->attached_array[i];
1019 if ((ids->value.int_val & 0xffff) == device_id)
1020 return &ids->value.attrib;
1021 }
1022
1023 return NULL;
1024}
1025
1026static int
1027acpi_video_get_device_type(struct acpi_video_bus *video,
1028 unsigned long device_id)
1029{
1030 struct acpi_video_enumerated_device *ids;
1031 int i;
1032
1033 for (i = 0; i < video->attached_count; i++) {
1034 ids = &video->attached_array[i];
1035 if ((ids->value.int_val & 0xffff) == device_id)
1036 return ids->value.int_val;
1037 }
1038
1039 return 0;
1040}
1041
1042static int
1043acpi_video_bus_get_one_device(struct acpi_device *device,
1044 struct acpi_video_bus *video)
1045{
1046 unsigned long long device_id;
1047 int status, device_type;
1048 struct acpi_video_device *data;
1049 struct acpi_video_device_attrib *attribute;
1050
1051 status =
1052 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1053 /* Some device omits _ADR, we skip them instead of fail */
1054 if (ACPI_FAILURE(status))
1055 return 0;
1056
1057 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1058 if (!data)
1059 return -ENOMEM;
1060
1061 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1062 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1063 device->driver_data = data;
1064
1065 data->device_id = device_id;
1066 data->video = video;
1067 data->dev = device;
1068 INIT_DELAYED_WORK(&data->switch_brightness_work,
1069 acpi_video_switch_brightness);
1070
1071 attribute = acpi_video_get_device_attr(video, device_id);
1072
1073 if (attribute && attribute->device_id_scheme) {
1074 switch (attribute->display_type) {
1075 case ACPI_VIDEO_DISPLAY_CRT:
1076 data->flags.crt = 1;
1077 break;
1078 case ACPI_VIDEO_DISPLAY_TV:
1079 data->flags.tvout = 1;
1080 break;
1081 case ACPI_VIDEO_DISPLAY_DVI:
1082 data->flags.dvi = 1;
1083 break;
1084 case ACPI_VIDEO_DISPLAY_LCD:
1085 data->flags.lcd = 1;
1086 break;
1087 default:
1088 data->flags.unknown = 1;
1089 break;
1090 }
1091 if (attribute->bios_can_detect)
1092 data->flags.bios = 1;
1093 } else {
1094 /* Check for legacy IDs */
1095 device_type = acpi_video_get_device_type(video, device_id);
1096 /* Ignore bits 16 and 18-20 */
1097 switch (device_type & 0xffe2ffff) {
1098 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1099 data->flags.crt = 1;
1100 break;
1101 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1102 data->flags.lcd = 1;
1103 break;
1104 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1105 data->flags.tvout = 1;
1106 break;
1107 default:
1108 data->flags.unknown = 1;
1109 }
1110 }
1111
1112 acpi_video_device_bind(video, data);
1113 acpi_video_device_find_cap(data);
1114
1115 mutex_lock(&video->device_list_lock);
1116 list_add_tail(&data->entry, &video->video_device_list);
1117 mutex_unlock(&video->device_list_lock);
1118
1119 return status;
1120}
1121
1122/*
1123 * Arg:
1124 * video : video bus device
1125 *
1126 * Return:
1127 * none
1128 *
1129 * Enumerate the video device list of the video bus,
1130 * bind the ids with the corresponding video devices
1131 * under the video bus.
1132 */
1133
1134static void acpi_video_device_rebind(struct acpi_video_bus *video)
1135{
1136 struct acpi_video_device *dev;
1137
1138 mutex_lock(&video->device_list_lock);
1139
1140 list_for_each_entry(dev, &video->video_device_list, entry)
1141 acpi_video_device_bind(video, dev);
1142
1143 mutex_unlock(&video->device_list_lock);
1144}
1145
1146/*
1147 * Arg:
1148 * video : video bus device
1149 * device : video output device under the video
1150 * bus
1151 *
1152 * Return:
1153 * none
1154 *
1155 * Bind the ids with the corresponding video devices
1156 * under the video bus.
1157 */
1158
1159static void
1160acpi_video_device_bind(struct acpi_video_bus *video,
1161 struct acpi_video_device *device)
1162{
1163 struct acpi_video_enumerated_device *ids;
1164 int i;
1165
1166 for (i = 0; i < video->attached_count; i++) {
1167 ids = &video->attached_array[i];
1168 if (device->device_id == (ids->value.int_val & 0xffff)) {
1169 ids->bind_info = device;
1170 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1171 }
1172 }
1173}
1174
1175static bool acpi_video_device_in_dod(struct acpi_video_device *device)
1176{
1177 struct acpi_video_bus *video = device->video;
1178 int i;
1179
1180 /*
1181 * If we have a broken _DOD or we have more than 8 output devices
1182 * under the graphics controller node that we can't proper deal with
1183 * in the operation region code currently, no need to test.
1184 */
1185 if (!video->attached_count || video->child_count > 8)
1186 return true;
1187
1188 for (i = 0; i < video->attached_count; i++) {
1189 if ((video->attached_array[i].value.int_val & 0xfff) ==
1190 (device->device_id & 0xfff))
1191 return true;
1192 }
1193
1194 return false;
1195}
1196
1197/*
1198 * Arg:
1199 * video : video bus device
1200 *
1201 * Return:
1202 * < 0 : error
1203 *
1204 * Call _DOD to enumerate all devices attached to display adapter
1205 *
1206 */
1207
1208static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1209{
1210 int status;
1211 int count;
1212 int i;
1213 struct acpi_video_enumerated_device *active_list;
1214 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1215 union acpi_object *dod = NULL;
1216 union acpi_object *obj;
1217
1218 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1219 if (!ACPI_SUCCESS(status)) {
1220 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1221 return status;
1222 }
1223
1224 dod = buffer.pointer;
1225 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1226 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1227 status = -EFAULT;
1228 goto out;
1229 }
1230
1231 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1232 dod->package.count));
1233
1234 active_list = kcalloc(1 + dod->package.count,
1235 sizeof(struct acpi_video_enumerated_device),
1236 GFP_KERNEL);
1237 if (!active_list) {
1238 status = -ENOMEM;
1239 goto out;
1240 }
1241
1242 count = 0;
1243 for (i = 0; i < dod->package.count; i++) {
1244 obj = &dod->package.elements[i];
1245
1246 if (obj->type != ACPI_TYPE_INTEGER) {
1247 printk(KERN_ERR PREFIX
1248 "Invalid _DOD data in element %d\n", i);
1249 continue;
1250 }
1251
1252 active_list[count].value.int_val = obj->integer.value;
1253 active_list[count].bind_info = NULL;
1254 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1255 (int)obj->integer.value));
1256 count++;
1257 }
1258
1259 kfree(video->attached_array);
1260
1261 video->attached_array = active_list;
1262 video->attached_count = count;
1263
1264out:
1265 kfree(buffer.pointer);
1266 return status;
1267}
1268
1269static int
1270acpi_video_get_next_level(struct acpi_video_device *device,
1271 u32 level_current, u32 event)
1272{
1273 int min, max, min_above, max_below, i, l, delta = 255;
1274 max = max_below = 0;
1275 min = min_above = 255;
1276 /* Find closest level to level_current */
1277 for (i = 2; i < device->brightness->count; i++) {
1278 l = device->brightness->levels[i];
1279 if (abs(l - level_current) < abs(delta)) {
1280 delta = l - level_current;
1281 if (!delta)
1282 break;
1283 }
1284 }
1285 /* Ajust level_current to closest available level */
1286 level_current += delta;
1287 for (i = 2; i < device->brightness->count; i++) {
1288 l = device->brightness->levels[i];
1289 if (l < min)
1290 min = l;
1291 if (l > max)
1292 max = l;
1293 if (l < min_above && l > level_current)
1294 min_above = l;
1295 if (l > max_below && l < level_current)
1296 max_below = l;
1297 }
1298
1299 switch (event) {
1300 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1301 return (level_current < max) ? min_above : min;
1302 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1303 return (level_current < max) ? min_above : max;
1304 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1305 return (level_current > min) ? max_below : min;
1306 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1307 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1308 return 0;
1309 default:
1310 return level_current;
1311 }
1312}
1313
1314static void
1315acpi_video_switch_brightness(struct work_struct *work)
1316{
1317 struct acpi_video_device *device = container_of(to_delayed_work(work),
1318 struct acpi_video_device, switch_brightness_work);
1319 unsigned long long level_current, level_next;
1320 int event = device->switch_brightness_event;
1321 int result = -EINVAL;
1322
1323 /* no warning message if acpi_backlight=vendor or a quirk is used */
1324 if (!acpi_video_verify_backlight_support())
1325 return;
1326
1327 if (!device->brightness)
1328 goto out;
1329
1330 result = acpi_video_device_lcd_get_level_current(device,
1331 &level_current,
1332 false);
1333 if (result)
1334 goto out;
1335
1336 level_next = acpi_video_get_next_level(device, level_current, event);
1337
1338 result = acpi_video_device_lcd_set_level(device, level_next);
1339
1340 if (!result)
1341 backlight_force_update(device->backlight,
1342 BACKLIGHT_UPDATE_HOTKEY);
1343
1344out:
1345 if (result)
1346 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1347}
1348
1349int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1350 void **edid)
1351{
1352 struct acpi_video_bus *video;
1353 struct acpi_video_device *video_device;
1354 union acpi_object *buffer = NULL;
1355 acpi_status status;
1356 int i, length;
1357
1358 if (!device || !acpi_driver_data(device))
1359 return -EINVAL;
1360
1361 video = acpi_driver_data(device);
1362
1363 for (i = 0; i < video->attached_count; i++) {
1364 video_device = video->attached_array[i].bind_info;
1365 length = 256;
1366
1367 if (!video_device)
1368 continue;
1369
1370 if (!video_device->cap._DDC)
1371 continue;
1372
1373 if (type) {
1374 switch (type) {
1375 case ACPI_VIDEO_DISPLAY_CRT:
1376 if (!video_device->flags.crt)
1377 continue;
1378 break;
1379 case ACPI_VIDEO_DISPLAY_TV:
1380 if (!video_device->flags.tvout)
1381 continue;
1382 break;
1383 case ACPI_VIDEO_DISPLAY_DVI:
1384 if (!video_device->flags.dvi)
1385 continue;
1386 break;
1387 case ACPI_VIDEO_DISPLAY_LCD:
1388 if (!video_device->flags.lcd)
1389 continue;
1390 break;
1391 }
1392 } else if (video_device->device_id != device_id) {
1393 continue;
1394 }
1395
1396 status = acpi_video_device_EDID(video_device, &buffer, length);
1397
1398 if (ACPI_FAILURE(status) || !buffer ||
1399 buffer->type != ACPI_TYPE_BUFFER) {
1400 length = 128;
1401 status = acpi_video_device_EDID(video_device, &buffer,
1402 length);
1403 if (ACPI_FAILURE(status) || !buffer ||
1404 buffer->type != ACPI_TYPE_BUFFER) {
1405 continue;
1406 }
1407 }
1408
1409 *edid = buffer->buffer.pointer;
1410 return length;
1411 }
1412
1413 return -ENODEV;
1414}
1415EXPORT_SYMBOL(acpi_video_get_edid);
1416
1417static int
1418acpi_video_bus_get_devices(struct acpi_video_bus *video,
1419 struct acpi_device *device)
1420{
1421 int status = 0;
1422 struct acpi_device *dev;
1423
1424 /*
1425 * There are systems where video module known to work fine regardless
1426 * of broken _DOD and ignoring returned value here doesn't cause
1427 * any issues later.
1428 */
1429 acpi_video_device_enumerate(video);
1430
1431 list_for_each_entry(dev, &device->children, node) {
1432
1433 status = acpi_video_bus_get_one_device(dev, video);
1434 if (status) {
1435 dev_err(&dev->dev, "Can't attach device\n");
1436 break;
1437 }
1438 video->child_count++;
1439 }
1440 return status;
1441}
1442
1443/* acpi_video interface */
1444
1445/*
1446 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1447 * preform any automatic brightness change on receiving a notification.
1448 */
1449static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1450{
1451 return acpi_video_bus_DOS(video, 0,
1452 acpi_osi_is_win8() ? 1 : 0);
1453}
1454
1455static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1456{
1457 return acpi_video_bus_DOS(video, 0,
1458 acpi_osi_is_win8() ? 0 : 1);
1459}
1460
1461static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1462{
1463 struct acpi_video_bus *video = acpi_driver_data(device);
1464 struct input_dev *input;
1465 int keycode = 0;
1466
1467 if (!video || !video->input)
1468 return;
1469
1470 input = video->input;
1471
1472 switch (event) {
1473 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1474 * most likely via hotkey. */
1475 keycode = KEY_SWITCHVIDEOMODE;
1476 break;
1477
1478 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1479 * connector. */
1480 acpi_video_device_enumerate(video);
1481 acpi_video_device_rebind(video);
1482 keycode = KEY_SWITCHVIDEOMODE;
1483 break;
1484
1485 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1486 keycode = KEY_SWITCHVIDEOMODE;
1487 break;
1488 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1489 keycode = KEY_VIDEO_NEXT;
1490 break;
1491 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1492 keycode = KEY_VIDEO_PREV;
1493 break;
1494
1495 default:
1496 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1497 "Unsupported event [0x%x]\n", event));
1498 break;
1499 }
1500
1501 if (acpi_notifier_call_chain(device, event, 0))
1502 /* Something vetoed the keypress. */
1503 keycode = 0;
1504
1505 if (keycode) {
1506 input_report_key(input, keycode, 1);
1507 input_sync(input);
1508 input_report_key(input, keycode, 0);
1509 input_sync(input);
1510 }
1511
1512 return;
1513}
1514
1515static void brightness_switch_event(struct acpi_video_device *video_device,
1516 u32 event)
1517{
1518 if (!brightness_switch_enabled)
1519 return;
1520
1521 video_device->switch_brightness_event = event;
1522 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10);
1523}
1524
1525static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1526{
1527 struct acpi_video_device *video_device = data;
1528 struct acpi_device *device = NULL;
1529 struct acpi_video_bus *bus;
1530 struct input_dev *input;
1531 int keycode = 0;
1532
1533 if (!video_device)
1534 return;
1535
1536 device = video_device->dev;
1537 bus = video_device->video;
1538 input = bus->input;
1539
1540 switch (event) {
1541 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1542 brightness_switch_event(video_device, event);
1543 keycode = KEY_BRIGHTNESS_CYCLE;
1544 break;
1545 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1546 brightness_switch_event(video_device, event);
1547 keycode = KEY_BRIGHTNESSUP;
1548 break;
1549 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1550 brightness_switch_event(video_device, event);
1551 keycode = KEY_BRIGHTNESSDOWN;
1552 break;
1553 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1554 brightness_switch_event(video_device, event);
1555 keycode = KEY_BRIGHTNESS_ZERO;
1556 break;
1557 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1558 brightness_switch_event(video_device, event);
1559 keycode = KEY_DISPLAY_OFF;
1560 break;
1561 default:
1562 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1563 "Unsupported event [0x%x]\n", event));
1564 break;
1565 }
1566
1567 acpi_notifier_call_chain(device, event, 0);
1568
1569 if (keycode) {
1570 input_report_key(input, keycode, 1);
1571 input_sync(input);
1572 input_report_key(input, keycode, 0);
1573 input_sync(input);
1574 }
1575
1576 return;
1577}
1578
1579static int acpi_video_resume(struct notifier_block *nb,
1580 unsigned long val, void *ign)
1581{
1582 struct acpi_video_bus *video;
1583 struct acpi_video_device *video_device;
1584 int i;
1585
1586 switch (val) {
1587 case PM_HIBERNATION_PREPARE:
1588 case PM_SUSPEND_PREPARE:
1589 case PM_RESTORE_PREPARE:
1590 return NOTIFY_DONE;
1591 }
1592
1593 video = container_of(nb, struct acpi_video_bus, pm_nb);
1594
1595 dev_info(&video->device->dev, "Restoring backlight state\n");
1596
1597 for (i = 0; i < video->attached_count; i++) {
1598 video_device = video->attached_array[i].bind_info;
1599 if (video_device && video_device->backlight)
1600 acpi_video_set_brightness(video_device->backlight);
1601 }
1602
1603 return NOTIFY_OK;
1604}
1605
1606static acpi_status
1607acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1608 void **return_value)
1609{
1610 struct acpi_device *device = context;
1611 struct acpi_device *sibling;
1612 int result;
1613
1614 if (handle == device->handle)
1615 return AE_CTRL_TERMINATE;
1616
1617 result = acpi_bus_get_device(handle, &sibling);
1618 if (result)
1619 return AE_OK;
1620
1621 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1622 return AE_ALREADY_EXISTS;
1623
1624 return AE_OK;
1625}
1626
1627static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1628{
1629 struct backlight_properties props;
1630 struct pci_dev *pdev;
1631 acpi_handle acpi_parent;
1632 struct device *parent = NULL;
1633 int result;
1634 static int count;
1635 char *name;
1636
1637 /*
1638 * Do not create backlight device for video output
1639 * device that is not in the enumerated list.
1640 */
1641 if (!acpi_video_device_in_dod(device)) {
1642 dev_dbg(&device->dev->dev, "not in _DOD list, ignore\n");
1643 return;
1644 }
1645
1646 result = acpi_video_init_brightness(device);
1647 if (result)
1648 return;
1649 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1650 if (!name)
1651 return;
1652 count++;
1653
1654 acpi_get_parent(device->dev->handle, &acpi_parent);
1655
1656 pdev = acpi_get_pci_dev(acpi_parent);
1657 if (pdev) {
1658 parent = &pdev->dev;
1659 pci_dev_put(pdev);
1660 }
1661
1662 memset(&props, 0, sizeof(struct backlight_properties));
1663 props.type = BACKLIGHT_FIRMWARE;
1664 props.max_brightness = device->brightness->count - 3;
1665 device->backlight = backlight_device_register(name,
1666 parent,
1667 device,
1668 &acpi_backlight_ops,
1669 &props);
1670 kfree(name);
1671 if (IS_ERR(device->backlight))
1672 return;
1673
1674 /*
1675 * Save current brightness level in case we have to restore it
1676 * before acpi_video_device_lcd_set_level() is called next time.
1677 */
1678 device->backlight->props.brightness =
1679 acpi_video_get_brightness(device->backlight);
1680
1681 device->cooling_dev = thermal_cooling_device_register("LCD",
1682 device->dev, &video_cooling_ops);
1683 if (IS_ERR(device->cooling_dev)) {
1684 /*
1685 * Set cooling_dev to NULL so we don't crash trying to free it.
1686 * Also, why the hell we are returning early and not attempt to
1687 * register video output if cooling device registration failed?
1688 * -- dtor
1689 */
1690 device->cooling_dev = NULL;
1691 return;
1692 }
1693
1694 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1695 device->cooling_dev->id);
1696 result = sysfs_create_link(&device->dev->dev.kobj,
1697 &device->cooling_dev->device.kobj,
1698 "thermal_cooling");
1699 if (result)
1700 printk(KERN_ERR PREFIX "Create sysfs link\n");
1701 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1702 &device->dev->dev.kobj, "device");
1703 if (result)
1704 printk(KERN_ERR PREFIX "Create sysfs link\n");
1705}
1706
1707static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video)
1708{
1709 struct acpi_video_device *dev;
1710 union acpi_object *levels;
1711
1712 mutex_lock(&video->device_list_lock);
1713 list_for_each_entry(dev, &video->video_device_list, entry) {
1714 if (!acpi_video_device_lcd_query_levels(dev, &levels))
1715 kfree(levels);
1716 }
1717 mutex_unlock(&video->device_list_lock);
1718}
1719
1720static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1721{
1722 struct acpi_video_device *dev;
1723
1724 if (video->backlight_registered)
1725 return 0;
1726
1727 acpi_video_run_bcl_for_osi(video);
1728
1729 if (!acpi_video_verify_backlight_support())
1730 return 0;
1731
1732 mutex_lock(&video->device_list_lock);
1733 list_for_each_entry(dev, &video->video_device_list, entry)
1734 acpi_video_dev_register_backlight(dev);
1735 mutex_unlock(&video->device_list_lock);
1736
1737 video->backlight_registered = true;
1738
1739 video->pm_nb.notifier_call = acpi_video_resume;
1740 video->pm_nb.priority = 0;
1741 return register_pm_notifier(&video->pm_nb);
1742}
1743
1744static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1745{
1746 if (device->backlight) {
1747 backlight_device_unregister(device->backlight);
1748 device->backlight = NULL;
1749 }
1750 if (device->brightness) {
1751 kfree(device->brightness->levels);
1752 kfree(device->brightness);
1753 device->brightness = NULL;
1754 }
1755 if (device->cooling_dev) {
1756 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1757 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1758 thermal_cooling_device_unregister(device->cooling_dev);
1759 device->cooling_dev = NULL;
1760 }
1761}
1762
1763static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1764{
1765 struct acpi_video_device *dev;
1766 int error;
1767
1768 if (!video->backlight_registered)
1769 return 0;
1770
1771 error = unregister_pm_notifier(&video->pm_nb);
1772
1773 mutex_lock(&video->device_list_lock);
1774 list_for_each_entry(dev, &video->video_device_list, entry)
1775 acpi_video_dev_unregister_backlight(dev);
1776 mutex_unlock(&video->device_list_lock);
1777
1778 video->backlight_registered = false;
1779
1780 return error;
1781}
1782
1783static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1784{
1785 acpi_status status;
1786 struct acpi_device *adev = device->dev;
1787
1788 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1789 acpi_video_device_notify, device);
1790 if (ACPI_FAILURE(status))
1791 dev_err(&adev->dev, "Error installing notify handler\n");
1792 else
1793 device->flags.notify = 1;
1794}
1795
1796static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1797{
1798 struct input_dev *input;
1799 struct acpi_video_device *dev;
1800 int error;
1801
1802 video->input = input = input_allocate_device();
1803 if (!input) {
1804 error = -ENOMEM;
1805 goto out;
1806 }
1807
1808 error = acpi_video_bus_start_devices(video);
1809 if (error)
1810 goto err_free_input;
1811
1812 snprintf(video->phys, sizeof(video->phys),
1813 "%s/video/input0", acpi_device_hid(video->device));
1814
1815 input->name = acpi_device_name(video->device);
1816 input->phys = video->phys;
1817 input->id.bustype = BUS_HOST;
1818 input->id.product = 0x06;
1819 input->dev.parent = &video->device->dev;
1820 input->evbit[0] = BIT(EV_KEY);
1821 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1822 set_bit(KEY_VIDEO_NEXT, input->keybit);
1823 set_bit(KEY_VIDEO_PREV, input->keybit);
1824 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1825 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1826 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1827 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1828 set_bit(KEY_DISPLAY_OFF, input->keybit);
1829
1830 error = input_register_device(input);
1831 if (error)
1832 goto err_stop_dev;
1833
1834 mutex_lock(&video->device_list_lock);
1835 list_for_each_entry(dev, &video->video_device_list, entry)
1836 acpi_video_dev_add_notify_handler(dev);
1837 mutex_unlock(&video->device_list_lock);
1838
1839 return 0;
1840
1841err_stop_dev:
1842 acpi_video_bus_stop_devices(video);
1843err_free_input:
1844 input_free_device(input);
1845 video->input = NULL;
1846out:
1847 return error;
1848}
1849
1850static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1851{
1852 if (dev->flags.notify) {
1853 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1854 acpi_video_device_notify);
1855 dev->flags.notify = 0;
1856 }
1857}
1858
1859static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1860{
1861 struct acpi_video_device *dev;
1862
1863 mutex_lock(&video->device_list_lock);
1864 list_for_each_entry(dev, &video->video_device_list, entry)
1865 acpi_video_dev_remove_notify_handler(dev);
1866 mutex_unlock(&video->device_list_lock);
1867
1868 acpi_video_bus_stop_devices(video);
1869 input_unregister_device(video->input);
1870 video->input = NULL;
1871}
1872
1873static int acpi_video_backlight_notify(struct notifier_block *nb,
1874 unsigned long val, void *bd)
1875{
1876 struct backlight_device *backlight = bd;
1877 struct acpi_video_bus *video;
1878
1879 /* acpi_video_verify_backlight_support only cares about raw devices */
1880 if (backlight->props.type != BACKLIGHT_RAW)
1881 return NOTIFY_DONE;
1882
1883 video = container_of(nb, struct acpi_video_bus, backlight_nb);
1884
1885 switch (val) {
1886 case BACKLIGHT_REGISTERED:
1887 if (!acpi_video_verify_backlight_support())
1888 acpi_video_bus_unregister_backlight(video);
1889 break;
1890 case BACKLIGHT_UNREGISTERED:
1891 acpi_video_bus_register_backlight(video);
1892 break;
1893 }
1894
1895 return NOTIFY_OK;
1896}
1897
1898static int acpi_video_bus_add_backlight_notify_handler(
1899 struct acpi_video_bus *video)
1900{
1901 int error;
1902
1903 video->backlight_nb.notifier_call = acpi_video_backlight_notify;
1904 video->backlight_nb.priority = 0;
1905 error = backlight_register_notifier(&video->backlight_nb);
1906 if (error == 0)
1907 video->backlight_notifier_registered = true;
1908
1909 return error;
1910}
1911
1912static int acpi_video_bus_remove_backlight_notify_handler(
1913 struct acpi_video_bus *video)
1914{
1915 if (!video->backlight_notifier_registered)
1916 return 0;
1917
1918 video->backlight_notifier_registered = false;
1919
1920 return backlight_unregister_notifier(&video->backlight_nb);
1921}
1922
1923static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1924{
1925 struct acpi_video_device *dev, *next;
1926
1927 mutex_lock(&video->device_list_lock);
1928 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1929 list_del(&dev->entry);
1930 kfree(dev);
1931 }
1932 mutex_unlock(&video->device_list_lock);
1933
1934 return 0;
1935}
1936
1937static int instance;
1938
1939static int acpi_video_bus_add(struct acpi_device *device)
1940{
1941 struct acpi_video_bus *video;
1942 int error;
1943 acpi_status status;
1944
1945 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1946 device->parent->handle, 1,
1947 acpi_video_bus_match, NULL,
1948 device, NULL);
1949 if (status == AE_ALREADY_EXISTS) {
1950 printk(KERN_WARNING FW_BUG
1951 "Duplicate ACPI video bus devices for the"
1952 " same VGA controller, please try module "
1953 "parameter \"video.allow_duplicates=1\""
1954 "if the current driver doesn't work.\n");
1955 if (!allow_duplicates)
1956 return -ENODEV;
1957 }
1958
1959 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1960 if (!video)
1961 return -ENOMEM;
1962
1963 /* a hack to fix the duplicate name "VID" problem on T61 */
1964 if (!strcmp(device->pnp.bus_id, "VID")) {
1965 if (instance)
1966 device->pnp.bus_id[3] = '0' + instance;
1967 instance++;
1968 }
1969 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1970 if (!strcmp(device->pnp.bus_id, "VGA")) {
1971 if (instance)
1972 device->pnp.bus_id[3] = '0' + instance;
1973 instance++;
1974 }
1975
1976 video->device = device;
1977 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1978 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1979 device->driver_data = video;
1980
1981 acpi_video_bus_find_cap(video);
1982 error = acpi_video_bus_check(video);
1983 if (error)
1984 goto err_free_video;
1985
1986 mutex_init(&video->device_list_lock);
1987 INIT_LIST_HEAD(&video->video_device_list);
1988
1989 error = acpi_video_bus_get_devices(video, device);
1990 if (error)
1991 goto err_put_video;
1992
1993 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
1994 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1995 video->flags.multihead ? "yes" : "no",
1996 video->flags.rom ? "yes" : "no",
1997 video->flags.post ? "yes" : "no");
1998 mutex_lock(&video_list_lock);
1999 list_add_tail(&video->entry, &video_bus_head);
2000 mutex_unlock(&video_list_lock);
2001
2002 acpi_video_bus_register_backlight(video);
2003 acpi_video_bus_add_notify_handler(video);
2004 acpi_video_bus_add_backlight_notify_handler(video);
2005
2006 return 0;
2007
2008err_put_video:
2009 acpi_video_bus_put_devices(video);
2010 kfree(video->attached_array);
2011err_free_video:
2012 kfree(video);
2013 device->driver_data = NULL;
2014
2015 return error;
2016}
2017
2018static int acpi_video_bus_remove(struct acpi_device *device)
2019{
2020 struct acpi_video_bus *video = NULL;
2021
2022
2023 if (!device || !acpi_driver_data(device))
2024 return -EINVAL;
2025
2026 video = acpi_driver_data(device);
2027
2028 acpi_video_bus_remove_backlight_notify_handler(video);
2029 acpi_video_bus_remove_notify_handler(video);
2030 acpi_video_bus_unregister_backlight(video);
2031 acpi_video_bus_put_devices(video);
2032
2033 mutex_lock(&video_list_lock);
2034 list_del(&video->entry);
2035 mutex_unlock(&video_list_lock);
2036
2037 kfree(video->attached_array);
2038 kfree(video);
2039
2040 return 0;
2041}
2042
2043static int __init is_i740(struct pci_dev *dev)
2044{
2045 if (dev->device == 0x00D1)
2046 return 1;
2047 if (dev->device == 0x7000)
2048 return 1;
2049 return 0;
2050}
2051
2052static int __init intel_opregion_present(void)
2053{
2054 int opregion = 0;
2055 struct pci_dev *dev = NULL;
2056 u32 address;
2057
2058 for_each_pci_dev(dev) {
2059 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2060 continue;
2061 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2062 continue;
2063 /* We don't want to poke around undefined i740 registers */
2064 if (is_i740(dev))
2065 continue;
2066 pci_read_config_dword(dev, 0xfc, &address);
2067 if (!address)
2068 continue;
2069 opregion = 1;
2070 }
2071 return opregion;
2072}
2073
2074int acpi_video_register(void)
2075{
2076 int result = 0;
2077 if (register_count) {
2078 /*
2079 * if the function of acpi_video_register is already called,
2080 * don't register the acpi_vide_bus again and return no error.
2081 */
2082 return 0;
2083 }
2084
2085 mutex_init(&video_list_lock);
2086 INIT_LIST_HEAD(&video_bus_head);
2087
2088 result = acpi_bus_register_driver(&acpi_video_bus);
2089 if (result < 0)
2090 return -ENODEV;
2091
2092 /*
2093 * When the acpi_video_bus is loaded successfully, increase
2094 * the counter reference.
2095 */
2096 register_count = 1;
2097
2098 return 0;
2099}
2100EXPORT_SYMBOL(acpi_video_register);
2101
2102void acpi_video_unregister(void)
2103{
2104 if (!register_count) {
2105 /*
2106 * If the acpi video bus is already unloaded, don't
2107 * unload it again and return directly.
2108 */
2109 return;
2110 }
2111 acpi_bus_unregister_driver(&acpi_video_bus);
2112
2113 register_count = 0;
2114
2115 return;
2116}
2117EXPORT_SYMBOL(acpi_video_unregister);
2118
2119void acpi_video_unregister_backlight(void)
2120{
2121 struct acpi_video_bus *video;
2122
2123 if (!register_count)
2124 return;
2125
2126 mutex_lock(&video_list_lock);
2127 list_for_each_entry(video, &video_bus_head, entry)
2128 acpi_video_bus_unregister_backlight(video);
2129 mutex_unlock(&video_list_lock);
2130}
2131EXPORT_SYMBOL(acpi_video_unregister_backlight);
2132
2133/*
2134 * This is kind of nasty. Hardware using Intel chipsets may require
2135 * the video opregion code to be run first in order to initialise
2136 * state before any ACPI video calls are made. To handle this we defer
2137 * registration of the video class until the opregion code has run.
2138 */
2139
2140static int __init acpi_video_init(void)
2141{
2142 dmi_check_system(video_dmi_table);
2143
2144 if (intel_opregion_present())
2145 return 0;
2146
2147 return acpi_video_register();
2148}
2149
2150static void __exit acpi_video_exit(void)
2151{
2152 acpi_video_unregister();
2153
2154 return;
2155}
2156
2157module_init(acpi_video_init);
2158module_exit(acpi_video_exit);
Linux kernel - Deliverables
This page took 0.031822 seconds and 5 git commands to generate.