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ACPI / video: Quirk initial backlight level 0
[deliverable/linux.git] / drivers / acpi / video.c
1 /*
2 * video.c - ACPI Video Driver
3 *
4 * Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
5 * Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
6 * Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
7 *
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or (at
13 * your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
23 *
24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25 */
26
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/types.h>
31 #include <linux/list.h>
32 #include <linux/mutex.h>
33 #include <linux/input.h>
34 #include <linux/backlight.h>
35 #include <linux/thermal.h>
36 #include <linux/sort.h>
37 #include <linux/pci.h>
38 #include <linux/pci_ids.h>
39 #include <linux/slab.h>
40 #include <asm/uaccess.h>
41 #include <linux/dmi.h>
42 #include <acpi/acpi_bus.h>
43 #include <acpi/acpi_drivers.h>
44 #include <linux/suspend.h>
45 #include <acpi/video.h>
46
47 #include "internal.h"
48
49 #define PREFIX "ACPI: "
50
51 #define ACPI_VIDEO_BUS_NAME "Video Bus"
52 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
53 #define ACPI_VIDEO_NOTIFY_SWITCH 0x80
54 #define ACPI_VIDEO_NOTIFY_PROBE 0x81
55 #define ACPI_VIDEO_NOTIFY_CYCLE 0x82
56 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
57 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
58
59 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
60 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
61 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
62 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
63 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
64
65 #define MAX_NAME_LEN 20
66
67 #define _COMPONENT ACPI_VIDEO_COMPONENT
68 ACPI_MODULE_NAME("video");
69
70 MODULE_AUTHOR("Bruno Ducrot");
71 MODULE_DESCRIPTION("ACPI Video Driver");
72 MODULE_LICENSE("GPL");
73
74 static bool brightness_switch_enabled = 1;
75 module_param(brightness_switch_enabled, bool, 0644);
76
77 /*
78 * By default, we don't allow duplicate ACPI video bus devices
79 * under the same VGA controller
80 */
81 static bool allow_duplicates;
82 module_param(allow_duplicates, bool, 0644);
83
84 /*
85 * Some BIOSes claim they use minimum backlight at boot,
86 * and this may bring dimming screen after boot
87 */
88 static bool use_bios_initial_backlight = 1;
89 module_param(use_bios_initial_backlight, bool, 0644);
90
91 /*
92 * For Windows 8 systems: if set ture and the GPU driver has
93 * registered a backlight interface, skip registering ACPI video's.
94 */
95 static bool use_native_backlight = false;
96 module_param(use_native_backlight, bool, 0644);
97
98 static int register_count;
99 static struct mutex video_list_lock;
100 static struct list_head video_bus_head;
101 static int acpi_video_bus_add(struct acpi_device *device);
102 static int acpi_video_bus_remove(struct acpi_device *device);
103 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
104
105 static const struct acpi_device_id video_device_ids[] = {
106 {ACPI_VIDEO_HID, 0},
107 {"", 0},
108 };
109 MODULE_DEVICE_TABLE(acpi, video_device_ids);
110
111 static struct acpi_driver acpi_video_bus = {
112 .name = "video",
113 .class = ACPI_VIDEO_CLASS,
114 .ids = video_device_ids,
115 .ops = {
116 .add = acpi_video_bus_add,
117 .remove = acpi_video_bus_remove,
118 .notify = acpi_video_bus_notify,
119 },
120 };
121
122 struct acpi_video_bus_flags {
123 u8 multihead:1; /* can switch video heads */
124 u8 rom:1; /* can retrieve a video rom */
125 u8 post:1; /* can configure the head to */
126 u8 reserved:5;
127 };
128
129 struct acpi_video_bus_cap {
130 u8 _DOS:1; /* Enable/Disable output switching */
131 u8 _DOD:1; /* Enumerate all devices attached to display adapter */
132 u8 _ROM:1; /* Get ROM Data */
133 u8 _GPD:1; /* Get POST Device */
134 u8 _SPD:1; /* Set POST Device */
135 u8 _VPO:1; /* Video POST Options */
136 u8 reserved:2;
137 };
138
139 struct acpi_video_device_attrib {
140 u32 display_index:4; /* A zero-based instance of the Display */
141 u32 display_port_attachment:4; /* This field differentiates the display type */
142 u32 display_type:4; /* Describe the specific type in use */
143 u32 vendor_specific:4; /* Chipset Vendor Specific */
144 u32 bios_can_detect:1; /* BIOS can detect the device */
145 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to
146 the VGA device. */
147 u32 pipe_id:3; /* For VGA multiple-head devices. */
148 u32 reserved:10; /* Must be 0 */
149 u32 device_id_scheme:1; /* Device ID Scheme */
150 };
151
152 struct acpi_video_enumerated_device {
153 union {
154 u32 int_val;
155 struct acpi_video_device_attrib attrib;
156 } value;
157 struct acpi_video_device *bind_info;
158 };
159
160 struct acpi_video_bus {
161 struct acpi_device *device;
162 u8 dos_setting;
163 struct acpi_video_enumerated_device *attached_array;
164 u8 attached_count;
165 struct acpi_video_bus_cap cap;
166 struct acpi_video_bus_flags flags;
167 struct list_head video_device_list;
168 struct mutex device_list_lock; /* protects video_device_list */
169 struct list_head entry;
170 struct input_dev *input;
171 char phys[32]; /* for input device */
172 struct notifier_block pm_nb;
173 };
174
175 struct acpi_video_device_flags {
176 u8 crt:1;
177 u8 lcd:1;
178 u8 tvout:1;
179 u8 dvi:1;
180 u8 bios:1;
181 u8 unknown:1;
182 u8 notify:1;
183 u8 reserved:1;
184 };
185
186 struct acpi_video_device_cap {
187 u8 _ADR:1; /* Return the unique ID */
188 u8 _BCL:1; /* Query list of brightness control levels supported */
189 u8 _BCM:1; /* Set the brightness level */
190 u8 _BQC:1; /* Get current brightness level */
191 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
192 u8 _DDC:1; /* Return the EDID for this device */
193 };
194
195 struct acpi_video_brightness_flags {
196 u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
197 u8 _BCL_reversed:1; /* _BCL package is in a reversed order */
198 u8 _BQC_use_index:1; /* _BQC returns an index value */
199 };
200
201 struct acpi_video_device_brightness {
202 int curr;
203 int count;
204 int *levels;
205 struct acpi_video_brightness_flags flags;
206 };
207
208 struct acpi_video_device {
209 unsigned long device_id;
210 struct acpi_video_device_flags flags;
211 struct acpi_video_device_cap cap;
212 struct list_head entry;
213 struct acpi_video_bus *video;
214 struct acpi_device *dev;
215 struct acpi_video_device_brightness *brightness;
216 struct backlight_device *backlight;
217 struct thermal_cooling_device *cooling_dev;
218 };
219
220 static const char device_decode[][30] = {
221 "motherboard VGA device",
222 "PCI VGA device",
223 "AGP VGA device",
224 "UNKNOWN",
225 };
226
227 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
228 static void acpi_video_device_rebind(struct acpi_video_bus *video);
229 static void acpi_video_device_bind(struct acpi_video_bus *video,
230 struct acpi_video_device *device);
231 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
232 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
233 int level);
234 static int acpi_video_device_lcd_get_level_current(
235 struct acpi_video_device *device,
236 unsigned long long *level, bool raw);
237 static int acpi_video_get_next_level(struct acpi_video_device *device,
238 u32 level_current, u32 event);
239 static int acpi_video_switch_brightness(struct acpi_video_device *device,
240 int event);
241
242 static bool acpi_video_verify_backlight_support(void)
243 {
244 if (acpi_osi_is_win8() && use_native_backlight &&
245 backlight_device_registered(BACKLIGHT_RAW))
246 return false;
247 return acpi_video_backlight_support();
248 }
249
250 /* backlight device sysfs support */
251 static int acpi_video_get_brightness(struct backlight_device *bd)
252 {
253 unsigned long long cur_level;
254 int i;
255 struct acpi_video_device *vd = bl_get_data(bd);
256
257 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
258 return -EINVAL;
259 for (i = 2; i < vd->brightness->count; i++) {
260 if (vd->brightness->levels[i] == cur_level)
261 /*
262 * The first two entries are special - see page 575
263 * of the ACPI spec 3.0
264 */
265 return i - 2;
266 }
267 return 0;
268 }
269
270 static int acpi_video_set_brightness(struct backlight_device *bd)
271 {
272 int request_level = bd->props.brightness + 2;
273 struct acpi_video_device *vd = bl_get_data(bd);
274
275 return acpi_video_device_lcd_set_level(vd,
276 vd->brightness->levels[request_level]);
277 }
278
279 static const struct backlight_ops acpi_backlight_ops = {
280 .get_brightness = acpi_video_get_brightness,
281 .update_status = acpi_video_set_brightness,
282 };
283
284 /* thermal cooling device callbacks */
285 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
286 long *state)
287 {
288 struct acpi_device *device = cooling_dev->devdata;
289 struct acpi_video_device *video = acpi_driver_data(device);
290
291 *state = video->brightness->count - 3;
292 return 0;
293 }
294
295 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
296 long *state)
297 {
298 struct acpi_device *device = cooling_dev->devdata;
299 struct acpi_video_device *video = acpi_driver_data(device);
300 unsigned long long level;
301 int offset;
302
303 if (acpi_video_device_lcd_get_level_current(video, &level, false))
304 return -EINVAL;
305 for (offset = 2; offset < video->brightness->count; offset++)
306 if (level == video->brightness->levels[offset]) {
307 *state = video->brightness->count - offset - 1;
308 return 0;
309 }
310
311 return -EINVAL;
312 }
313
314 static int
315 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
316 {
317 struct acpi_device *device = cooling_dev->devdata;
318 struct acpi_video_device *video = acpi_driver_data(device);
319 int level;
320
321 if (state >= video->brightness->count - 2)
322 return -EINVAL;
323
324 state = video->brightness->count - state;
325 level = video->brightness->levels[state - 1];
326 return acpi_video_device_lcd_set_level(video, level);
327 }
328
329 static const struct thermal_cooling_device_ops video_cooling_ops = {
330 .get_max_state = video_get_max_state,
331 .get_cur_state = video_get_cur_state,
332 .set_cur_state = video_set_cur_state,
333 };
334
335 /*
336 * --------------------------------------------------------------------------
337 * Video Management
338 * --------------------------------------------------------------------------
339 */
340
341 static int
342 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
343 union acpi_object **levels)
344 {
345 int status;
346 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
347 union acpi_object *obj;
348
349
350 *levels = NULL;
351
352 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
353 if (!ACPI_SUCCESS(status))
354 return status;
355 obj = (union acpi_object *)buffer.pointer;
356 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
357 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
358 status = -EFAULT;
359 goto err;
360 }
361
362 *levels = obj;
363
364 return 0;
365
366 err:
367 kfree(buffer.pointer);
368
369 return status;
370 }
371
372 static int
373 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
374 {
375 int status;
376 int state;
377
378 status = acpi_execute_simple_method(device->dev->handle,
379 "_BCM", level);
380 if (ACPI_FAILURE(status)) {
381 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
382 return -EIO;
383 }
384
385 device->brightness->curr = level;
386 for (state = 2; state < device->brightness->count; state++)
387 if (level == device->brightness->levels[state]) {
388 if (device->backlight)
389 device->backlight->props.brightness = state - 2;
390 return 0;
391 }
392
393 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
394 return -EINVAL;
395 }
396
397 /*
398 * For some buggy _BQC methods, we need to add a constant value to
399 * the _BQC return value to get the actual current brightness level
400 */
401
402 static int bqc_offset_aml_bug_workaround;
403 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
404 {
405 bqc_offset_aml_bug_workaround = 9;
406 return 0;
407 }
408
409 static int video_ignore_initial_backlight(const struct dmi_system_id *d)
410 {
411 use_bios_initial_backlight = 0;
412 return 0;
413 }
414
415 static struct dmi_system_id video_dmi_table[] __initdata = {
416 /*
417 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
418 */
419 {
420 .callback = video_set_bqc_offset,
421 .ident = "Acer Aspire 5720",
422 .matches = {
423 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
424 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
425 },
426 },
427 {
428 .callback = video_set_bqc_offset,
429 .ident = "Acer Aspire 5710Z",
430 .matches = {
431 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
432 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
433 },
434 },
435 {
436 .callback = video_set_bqc_offset,
437 .ident = "eMachines E510",
438 .matches = {
439 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
440 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
441 },
442 },
443 {
444 .callback = video_set_bqc_offset,
445 .ident = "Acer Aspire 5315",
446 .matches = {
447 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
448 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
449 },
450 },
451 {
452 .callback = video_set_bqc_offset,
453 .ident = "Acer Aspire 7720",
454 .matches = {
455 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
456 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
457 },
458 },
459 {
460 .callback = video_ignore_initial_backlight,
461 .ident = "HP Folio 13-2000",
462 .matches = {
463 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
464 DMI_MATCH(DMI_PRODUCT_NAME, "HP Folio 13 - 2000 Notebook PC"),
465 },
466 },
467 {
468 .callback = video_ignore_initial_backlight,
469 .ident = "Fujitsu E753",
470 .matches = {
471 DMI_MATCH(DMI_BOARD_VENDOR, "FUJITSU"),
472 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E753"),
473 },
474 },
475 {
476 .callback = video_ignore_initial_backlight,
477 .ident = "HP Pavilion dm4",
478 .matches = {
479 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
480 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion dm4 Notebook PC"),
481 },
482 },
483 {
484 .callback = video_ignore_initial_backlight,
485 .ident = "HP Pavilion g6 Notebook PC",
486 .matches = {
487 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
488 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion g6 Notebook PC"),
489 },
490 },
491 {
492 .callback = video_ignore_initial_backlight,
493 .ident = "HP 1000 Notebook PC",
494 .matches = {
495 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
496 DMI_MATCH(DMI_PRODUCT_NAME, "HP 1000 Notebook PC"),
497 },
498 },
499 {
500 .callback = video_ignore_initial_backlight,
501 .ident = "HP Pavilion m4",
502 .matches = {
503 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
504 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion m4 Notebook PC"),
505 },
506 },
507 {
508 .callback = video_ignore_initial_backlight,
509 .ident = "HP 250 G1",
510 .matches = {
511 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
512 DMI_MATCH(DMI_PRODUCT_NAME, "HP 250 G1 Notebook PC"),
513 },
514 },
515 {}
516 };
517
518 static unsigned long long
519 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
520 unsigned long long bqc_value)
521 {
522 unsigned long long level;
523
524 if (device->brightness->flags._BQC_use_index) {
525 /*
526 * _BQC returns an index that doesn't account for
527 * the first 2 items with special meaning, so we need
528 * to compensate for that by offsetting ourselves
529 */
530 if (device->brightness->flags._BCL_reversed)
531 bqc_value = device->brightness->count - 3 - bqc_value;
532
533 level = device->brightness->levels[bqc_value + 2];
534 } else {
535 level = bqc_value;
536 }
537
538 level += bqc_offset_aml_bug_workaround;
539
540 return level;
541 }
542
543 static int
544 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
545 unsigned long long *level, bool raw)
546 {
547 acpi_status status = AE_OK;
548 int i;
549
550 if (device->cap._BQC || device->cap._BCQ) {
551 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
552
553 status = acpi_evaluate_integer(device->dev->handle, buf,
554 NULL, level);
555 if (ACPI_SUCCESS(status)) {
556 if (raw) {
557 /*
558 * Caller has indicated he wants the raw
559 * value returned by _BQC, so don't furtherly
560 * mess with the value.
561 */
562 return 0;
563 }
564
565 *level = acpi_video_bqc_value_to_level(device, *level);
566
567 for (i = 2; i < device->brightness->count; i++)
568 if (device->brightness->levels[i] == *level) {
569 device->brightness->curr = *level;
570 return 0;
571 }
572 /*
573 * BQC returned an invalid level.
574 * Stop using it.
575 */
576 ACPI_WARNING((AE_INFO,
577 "%s returned an invalid level",
578 buf));
579 device->cap._BQC = device->cap._BCQ = 0;
580 } else {
581 /*
582 * Fixme:
583 * should we return an error or ignore this failure?
584 * dev->brightness->curr is a cached value which stores
585 * the correct current backlight level in most cases.
586 * ACPI video backlight still works w/ buggy _BQC.
587 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
588 */
589 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
590 device->cap._BQC = device->cap._BCQ = 0;
591 }
592 }
593
594 *level = device->brightness->curr;
595 return 0;
596 }
597
598 static int
599 acpi_video_device_EDID(struct acpi_video_device *device,
600 union acpi_object **edid, ssize_t length)
601 {
602 int status;
603 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
604 union acpi_object *obj;
605 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
606 struct acpi_object_list args = { 1, &arg0 };
607
608
609 *edid = NULL;
610
611 if (!device)
612 return -ENODEV;
613 if (length == 128)
614 arg0.integer.value = 1;
615 else if (length == 256)
616 arg0.integer.value = 2;
617 else
618 return -EINVAL;
619
620 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
621 if (ACPI_FAILURE(status))
622 return -ENODEV;
623
624 obj = buffer.pointer;
625
626 if (obj && obj->type == ACPI_TYPE_BUFFER)
627 *edid = obj;
628 else {
629 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
630 status = -EFAULT;
631 kfree(obj);
632 }
633
634 return status;
635 }
636
637 /* bus */
638
639 /*
640 * Arg:
641 * video : video bus device pointer
642 * bios_flag :
643 * 0. The system BIOS should NOT automatically switch(toggle)
644 * the active display output.
645 * 1. The system BIOS should automatically switch (toggle) the
646 * active display output. No switch event.
647 * 2. The _DGS value should be locked.
648 * 3. The system BIOS should not automatically switch (toggle) the
649 * active display output, but instead generate the display switch
650 * event notify code.
651 * lcd_flag :
652 * 0. The system BIOS should automatically control the brightness level
653 * of the LCD when the power changes from AC to DC
654 * 1. The system BIOS should NOT automatically control the brightness
655 * level of the LCD when the power changes from AC to DC.
656 * Return Value:
657 * -EINVAL wrong arg.
658 */
659
660 static int
661 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
662 {
663 acpi_status status;
664
665 if (!video->cap._DOS)
666 return 0;
667
668 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
669 return -EINVAL;
670 video->dos_setting = (lcd_flag << 2) | bios_flag;
671 status = acpi_execute_simple_method(video->device->handle, "_DOS",
672 (lcd_flag << 2) | bios_flag);
673 if (ACPI_FAILURE(status))
674 return -EIO;
675
676 return 0;
677 }
678
679 /*
680 * Simple comparison function used to sort backlight levels.
681 */
682
683 static int
684 acpi_video_cmp_level(const void *a, const void *b)
685 {
686 return *(int *)a - *(int *)b;
687 }
688
689 /*
690 * Decides if _BQC/_BCQ for this system is usable
691 *
692 * We do this by changing the level first and then read out the current
693 * brightness level, if the value does not match, find out if it is using
694 * index. If not, clear the _BQC/_BCQ capability.
695 */
696 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
697 int max_level, int current_level)
698 {
699 struct acpi_video_device_brightness *br = device->brightness;
700 int result;
701 unsigned long long level;
702 int test_level;
703
704 /* don't mess with existing known broken systems */
705 if (bqc_offset_aml_bug_workaround)
706 return 0;
707
708 /*
709 * Some systems always report current brightness level as maximum
710 * through _BQC, we need to test another value for them.
711 */
712 test_level = current_level == max_level ? br->levels[3] : max_level;
713
714 result = acpi_video_device_lcd_set_level(device, test_level);
715 if (result)
716 return result;
717
718 result = acpi_video_device_lcd_get_level_current(device, &level, true);
719 if (result)
720 return result;
721
722 if (level != test_level) {
723 /* buggy _BQC found, need to find out if it uses index */
724 if (level < br->count) {
725 if (br->flags._BCL_reversed)
726 level = br->count - 3 - level;
727 if (br->levels[level + 2] == test_level)
728 br->flags._BQC_use_index = 1;
729 }
730
731 if (!br->flags._BQC_use_index)
732 device->cap._BQC = device->cap._BCQ = 0;
733 }
734
735 return 0;
736 }
737
738
739 /*
740 * Arg:
741 * device : video output device (LCD, CRT, ..)
742 *
743 * Return Value:
744 * Maximum brightness level
745 *
746 * Allocate and initialize device->brightness.
747 */
748
749 static int
750 acpi_video_init_brightness(struct acpi_video_device *device)
751 {
752 union acpi_object *obj = NULL;
753 int i, max_level = 0, count = 0, level_ac_battery = 0;
754 unsigned long long level, level_old;
755 union acpi_object *o;
756 struct acpi_video_device_brightness *br = NULL;
757 int result = -EINVAL;
758
759 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
760 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
761 "LCD brightness level\n"));
762 goto out;
763 }
764
765 if (obj->package.count < 2)
766 goto out;
767
768 br = kzalloc(sizeof(*br), GFP_KERNEL);
769 if (!br) {
770 printk(KERN_ERR "can't allocate memory\n");
771 result = -ENOMEM;
772 goto out;
773 }
774
775 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
776 GFP_KERNEL);
777 if (!br->levels) {
778 result = -ENOMEM;
779 goto out_free;
780 }
781
782 for (i = 0; i < obj->package.count; i++) {
783 o = (union acpi_object *)&obj->package.elements[i];
784 if (o->type != ACPI_TYPE_INTEGER) {
785 printk(KERN_ERR PREFIX "Invalid data\n");
786 continue;
787 }
788 br->levels[count] = (u32) o->integer.value;
789
790 if (br->levels[count] > max_level)
791 max_level = br->levels[count];
792 count++;
793 }
794
795 /*
796 * some buggy BIOS don't export the levels
797 * when machine is on AC/Battery in _BCL package.
798 * In this case, the first two elements in _BCL packages
799 * are also supported brightness levels that OS should take care of.
800 */
801 for (i = 2; i < count; i++) {
802 if (br->levels[i] == br->levels[0])
803 level_ac_battery++;
804 if (br->levels[i] == br->levels[1])
805 level_ac_battery++;
806 }
807
808 if (level_ac_battery < 2) {
809 level_ac_battery = 2 - level_ac_battery;
810 br->flags._BCL_no_ac_battery_levels = 1;
811 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
812 br->levels[i] = br->levels[i - level_ac_battery];
813 count += level_ac_battery;
814 } else if (level_ac_battery > 2)
815 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
816
817 /* Check if the _BCL package is in a reversed order */
818 if (max_level == br->levels[2]) {
819 br->flags._BCL_reversed = 1;
820 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
821 acpi_video_cmp_level, NULL);
822 } else if (max_level != br->levels[count - 1])
823 ACPI_ERROR((AE_INFO,
824 "Found unordered _BCL package"));
825
826 br->count = count;
827 device->brightness = br;
828
829 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
830 br->curr = level = max_level;
831
832 if (!device->cap._BQC)
833 goto set_level;
834
835 result = acpi_video_device_lcd_get_level_current(device,
836 &level_old, true);
837 if (result)
838 goto out_free_levels;
839
840 result = acpi_video_bqc_quirk(device, max_level, level_old);
841 if (result)
842 goto out_free_levels;
843 /*
844 * cap._BQC may get cleared due to _BQC is found to be broken
845 * in acpi_video_bqc_quirk, so check again here.
846 */
847 if (!device->cap._BQC)
848 goto set_level;
849
850 if (use_bios_initial_backlight) {
851 level = acpi_video_bqc_value_to_level(device, level_old);
852 /*
853 * On some buggy laptops, _BQC returns an uninitialized
854 * value when invoked for the first time, i.e.
855 * level_old is invalid (no matter whether it's a level
856 * or an index). Set the backlight to max_level in this case.
857 */
858 for (i = 2; i < br->count; i++)
859 if (level == br->levels[i])
860 break;
861 if (i == br->count || !level)
862 level = max_level;
863 }
864
865 set_level:
866 result = acpi_video_device_lcd_set_level(device, level);
867 if (result)
868 goto out_free_levels;
869
870 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
871 "found %d brightness levels\n", count - 2));
872 kfree(obj);
873 return result;
874
875 out_free_levels:
876 kfree(br->levels);
877 out_free:
878 kfree(br);
879 out:
880 device->brightness = NULL;
881 kfree(obj);
882 return result;
883 }
884
885 /*
886 * Arg:
887 * device : video output device (LCD, CRT, ..)
888 *
889 * Return Value:
890 * None
891 *
892 * Find out all required AML methods defined under the output
893 * device.
894 */
895
896 static void acpi_video_device_find_cap(struct acpi_video_device *device)
897 {
898 if (acpi_has_method(device->dev->handle, "_ADR"))
899 device->cap._ADR = 1;
900 if (acpi_has_method(device->dev->handle, "_BCL"))
901 device->cap._BCL = 1;
902 if (acpi_has_method(device->dev->handle, "_BCM"))
903 device->cap._BCM = 1;
904 if (acpi_has_method(device->dev->handle, "_BQC")) {
905 device->cap._BQC = 1;
906 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
907 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
908 device->cap._BCQ = 1;
909 }
910
911 if (acpi_has_method(device->dev->handle, "_DDC"))
912 device->cap._DDC = 1;
913 }
914
915 /*
916 * Arg:
917 * device : video output device (VGA)
918 *
919 * Return Value:
920 * None
921 *
922 * Find out all required AML methods defined under the video bus device.
923 */
924
925 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
926 {
927 if (acpi_has_method(video->device->handle, "_DOS"))
928 video->cap._DOS = 1;
929 if (acpi_has_method(video->device->handle, "_DOD"))
930 video->cap._DOD = 1;
931 if (acpi_has_method(video->device->handle, "_ROM"))
932 video->cap._ROM = 1;
933 if (acpi_has_method(video->device->handle, "_GPD"))
934 video->cap._GPD = 1;
935 if (acpi_has_method(video->device->handle, "_SPD"))
936 video->cap._SPD = 1;
937 if (acpi_has_method(video->device->handle, "_VPO"))
938 video->cap._VPO = 1;
939 }
940
941 /*
942 * Check whether the video bus device has required AML method to
943 * support the desired features
944 */
945
946 static int acpi_video_bus_check(struct acpi_video_bus *video)
947 {
948 acpi_status status = -ENOENT;
949 struct pci_dev *dev;
950
951 if (!video)
952 return -EINVAL;
953
954 dev = acpi_get_pci_dev(video->device->handle);
955 if (!dev)
956 return -ENODEV;
957 pci_dev_put(dev);
958
959 /*
960 * Since there is no HID, CID and so on for VGA driver, we have
961 * to check well known required nodes.
962 */
963
964 /* Does this device support video switching? */
965 if (video->cap._DOS || video->cap._DOD) {
966 if (!video->cap._DOS) {
967 printk(KERN_WARNING FW_BUG
968 "ACPI(%s) defines _DOD but not _DOS\n",
969 acpi_device_bid(video->device));
970 }
971 video->flags.multihead = 1;
972 status = 0;
973 }
974
975 /* Does this device support retrieving a video ROM? */
976 if (video->cap._ROM) {
977 video->flags.rom = 1;
978 status = 0;
979 }
980
981 /* Does this device support configuring which video device to POST? */
982 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
983 video->flags.post = 1;
984 status = 0;
985 }
986
987 return status;
988 }
989
990 /*
991 * --------------------------------------------------------------------------
992 * Driver Interface
993 * --------------------------------------------------------------------------
994 */
995
996 /* device interface */
997 static struct acpi_video_device_attrib *
998 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
999 {
1000 struct acpi_video_enumerated_device *ids;
1001 int i;
1002
1003 for (i = 0; i < video->attached_count; i++) {
1004 ids = &video->attached_array[i];
1005 if ((ids->value.int_val & 0xffff) == device_id)
1006 return &ids->value.attrib;
1007 }
1008
1009 return NULL;
1010 }
1011
1012 static int
1013 acpi_video_get_device_type(struct acpi_video_bus *video,
1014 unsigned long device_id)
1015 {
1016 struct acpi_video_enumerated_device *ids;
1017 int i;
1018
1019 for (i = 0; i < video->attached_count; i++) {
1020 ids = &video->attached_array[i];
1021 if ((ids->value.int_val & 0xffff) == device_id)
1022 return ids->value.int_val;
1023 }
1024
1025 return 0;
1026 }
1027
1028 static int
1029 acpi_video_bus_get_one_device(struct acpi_device *device,
1030 struct acpi_video_bus *video)
1031 {
1032 unsigned long long device_id;
1033 int status, device_type;
1034 struct acpi_video_device *data;
1035 struct acpi_video_device_attrib *attribute;
1036
1037 status =
1038 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1039 /* Some device omits _ADR, we skip them instead of fail */
1040 if (ACPI_FAILURE(status))
1041 return 0;
1042
1043 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1044 if (!data)
1045 return -ENOMEM;
1046
1047 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1048 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1049 device->driver_data = data;
1050
1051 data->device_id = device_id;
1052 data->video = video;
1053 data->dev = device;
1054
1055 attribute = acpi_video_get_device_attr(video, device_id);
1056
1057 if (attribute && attribute->device_id_scheme) {
1058 switch (attribute->display_type) {
1059 case ACPI_VIDEO_DISPLAY_CRT:
1060 data->flags.crt = 1;
1061 break;
1062 case ACPI_VIDEO_DISPLAY_TV:
1063 data->flags.tvout = 1;
1064 break;
1065 case ACPI_VIDEO_DISPLAY_DVI:
1066 data->flags.dvi = 1;
1067 break;
1068 case ACPI_VIDEO_DISPLAY_LCD:
1069 data->flags.lcd = 1;
1070 break;
1071 default:
1072 data->flags.unknown = 1;
1073 break;
1074 }
1075 if (attribute->bios_can_detect)
1076 data->flags.bios = 1;
1077 } else {
1078 /* Check for legacy IDs */
1079 device_type = acpi_video_get_device_type(video, device_id);
1080 /* Ignore bits 16 and 18-20 */
1081 switch (device_type & 0xffe2ffff) {
1082 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1083 data->flags.crt = 1;
1084 break;
1085 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1086 data->flags.lcd = 1;
1087 break;
1088 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1089 data->flags.tvout = 1;
1090 break;
1091 default:
1092 data->flags.unknown = 1;
1093 }
1094 }
1095
1096 acpi_video_device_bind(video, data);
1097 acpi_video_device_find_cap(data);
1098
1099 mutex_lock(&video->device_list_lock);
1100 list_add_tail(&data->entry, &video->video_device_list);
1101 mutex_unlock(&video->device_list_lock);
1102
1103 return status;
1104 }
1105
1106 /*
1107 * Arg:
1108 * video : video bus device
1109 *
1110 * Return:
1111 * none
1112 *
1113 * Enumerate the video device list of the video bus,
1114 * bind the ids with the corresponding video devices
1115 * under the video bus.
1116 */
1117
1118 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1119 {
1120 struct acpi_video_device *dev;
1121
1122 mutex_lock(&video->device_list_lock);
1123
1124 list_for_each_entry(dev, &video->video_device_list, entry)
1125 acpi_video_device_bind(video, dev);
1126
1127 mutex_unlock(&video->device_list_lock);
1128 }
1129
1130 /*
1131 * Arg:
1132 * video : video bus device
1133 * device : video output device under the video
1134 * bus
1135 *
1136 * Return:
1137 * none
1138 *
1139 * Bind the ids with the corresponding video devices
1140 * under the video bus.
1141 */
1142
1143 static void
1144 acpi_video_device_bind(struct acpi_video_bus *video,
1145 struct acpi_video_device *device)
1146 {
1147 struct acpi_video_enumerated_device *ids;
1148 int i;
1149
1150 for (i = 0; i < video->attached_count; i++) {
1151 ids = &video->attached_array[i];
1152 if (device->device_id == (ids->value.int_val & 0xffff)) {
1153 ids->bind_info = device;
1154 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1155 }
1156 }
1157 }
1158
1159 /*
1160 * Arg:
1161 * video : video bus device
1162 *
1163 * Return:
1164 * < 0 : error
1165 *
1166 * Call _DOD to enumerate all devices attached to display adapter
1167 *
1168 */
1169
1170 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1171 {
1172 int status;
1173 int count;
1174 int i;
1175 struct acpi_video_enumerated_device *active_list;
1176 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1177 union acpi_object *dod = NULL;
1178 union acpi_object *obj;
1179
1180 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1181 if (!ACPI_SUCCESS(status)) {
1182 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1183 return status;
1184 }
1185
1186 dod = buffer.pointer;
1187 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1188 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1189 status = -EFAULT;
1190 goto out;
1191 }
1192
1193 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1194 dod->package.count));
1195
1196 active_list = kcalloc(1 + dod->package.count,
1197 sizeof(struct acpi_video_enumerated_device),
1198 GFP_KERNEL);
1199 if (!active_list) {
1200 status = -ENOMEM;
1201 goto out;
1202 }
1203
1204 count = 0;
1205 for (i = 0; i < dod->package.count; i++) {
1206 obj = &dod->package.elements[i];
1207
1208 if (obj->type != ACPI_TYPE_INTEGER) {
1209 printk(KERN_ERR PREFIX
1210 "Invalid _DOD data in element %d\n", i);
1211 continue;
1212 }
1213
1214 active_list[count].value.int_val = obj->integer.value;
1215 active_list[count].bind_info = NULL;
1216 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1217 (int)obj->integer.value));
1218 count++;
1219 }
1220
1221 kfree(video->attached_array);
1222
1223 video->attached_array = active_list;
1224 video->attached_count = count;
1225
1226 out:
1227 kfree(buffer.pointer);
1228 return status;
1229 }
1230
1231 static int
1232 acpi_video_get_next_level(struct acpi_video_device *device,
1233 u32 level_current, u32 event)
1234 {
1235 int min, max, min_above, max_below, i, l, delta = 255;
1236 max = max_below = 0;
1237 min = min_above = 255;
1238 /* Find closest level to level_current */
1239 for (i = 2; i < device->brightness->count; i++) {
1240 l = device->brightness->levels[i];
1241 if (abs(l - level_current) < abs(delta)) {
1242 delta = l - level_current;
1243 if (!delta)
1244 break;
1245 }
1246 }
1247 /* Ajust level_current to closest available level */
1248 level_current += delta;
1249 for (i = 2; i < device->brightness->count; i++) {
1250 l = device->brightness->levels[i];
1251 if (l < min)
1252 min = l;
1253 if (l > max)
1254 max = l;
1255 if (l < min_above && l > level_current)
1256 min_above = l;
1257 if (l > max_below && l < level_current)
1258 max_below = l;
1259 }
1260
1261 switch (event) {
1262 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1263 return (level_current < max) ? min_above : min;
1264 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1265 return (level_current < max) ? min_above : max;
1266 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1267 return (level_current > min) ? max_below : min;
1268 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1269 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1270 return 0;
1271 default:
1272 return level_current;
1273 }
1274 }
1275
1276 static int
1277 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1278 {
1279 unsigned long long level_current, level_next;
1280 int result = -EINVAL;
1281
1282 /* no warning message if acpi_backlight=vendor or a quirk is used */
1283 if (!acpi_video_verify_backlight_support())
1284 return 0;
1285
1286 if (!device->brightness)
1287 goto out;
1288
1289 result = acpi_video_device_lcd_get_level_current(device,
1290 &level_current,
1291 false);
1292 if (result)
1293 goto out;
1294
1295 level_next = acpi_video_get_next_level(device, level_current, event);
1296
1297 result = acpi_video_device_lcd_set_level(device, level_next);
1298
1299 if (!result)
1300 backlight_force_update(device->backlight,
1301 BACKLIGHT_UPDATE_HOTKEY);
1302
1303 out:
1304 if (result)
1305 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1306
1307 return result;
1308 }
1309
1310 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1311 void **edid)
1312 {
1313 struct acpi_video_bus *video;
1314 struct acpi_video_device *video_device;
1315 union acpi_object *buffer = NULL;
1316 acpi_status status;
1317 int i, length;
1318
1319 if (!device || !acpi_driver_data(device))
1320 return -EINVAL;
1321
1322 video = acpi_driver_data(device);
1323
1324 for (i = 0; i < video->attached_count; i++) {
1325 video_device = video->attached_array[i].bind_info;
1326 length = 256;
1327
1328 if (!video_device)
1329 continue;
1330
1331 if (!video_device->cap._DDC)
1332 continue;
1333
1334 if (type) {
1335 switch (type) {
1336 case ACPI_VIDEO_DISPLAY_CRT:
1337 if (!video_device->flags.crt)
1338 continue;
1339 break;
1340 case ACPI_VIDEO_DISPLAY_TV:
1341 if (!video_device->flags.tvout)
1342 continue;
1343 break;
1344 case ACPI_VIDEO_DISPLAY_DVI:
1345 if (!video_device->flags.dvi)
1346 continue;
1347 break;
1348 case ACPI_VIDEO_DISPLAY_LCD:
1349 if (!video_device->flags.lcd)
1350 continue;
1351 break;
1352 }
1353 } else if (video_device->device_id != device_id) {
1354 continue;
1355 }
1356
1357 status = acpi_video_device_EDID(video_device, &buffer, length);
1358
1359 if (ACPI_FAILURE(status) || !buffer ||
1360 buffer->type != ACPI_TYPE_BUFFER) {
1361 length = 128;
1362 status = acpi_video_device_EDID(video_device, &buffer,
1363 length);
1364 if (ACPI_FAILURE(status) || !buffer ||
1365 buffer->type != ACPI_TYPE_BUFFER) {
1366 continue;
1367 }
1368 }
1369
1370 *edid = buffer->buffer.pointer;
1371 return length;
1372 }
1373
1374 return -ENODEV;
1375 }
1376 EXPORT_SYMBOL(acpi_video_get_edid);
1377
1378 static int
1379 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1380 struct acpi_device *device)
1381 {
1382 int status = 0;
1383 struct acpi_device *dev;
1384
1385 /*
1386 * There are systems where video module known to work fine regardless
1387 * of broken _DOD and ignoring returned value here doesn't cause
1388 * any issues later.
1389 */
1390 acpi_video_device_enumerate(video);
1391
1392 list_for_each_entry(dev, &device->children, node) {
1393
1394 status = acpi_video_bus_get_one_device(dev, video);
1395 if (status) {
1396 dev_err(&dev->dev, "Can't attach device\n");
1397 break;
1398 }
1399 }
1400 return status;
1401 }
1402
1403 /* acpi_video interface */
1404
1405 /*
1406 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1407 * preform any automatic brightness change on receiving a notification.
1408 */
1409 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1410 {
1411 return acpi_video_bus_DOS(video, 0,
1412 acpi_osi_is_win8() ? 1 : 0);
1413 }
1414
1415 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1416 {
1417 return acpi_video_bus_DOS(video, 0,
1418 acpi_osi_is_win8() ? 0 : 1);
1419 }
1420
1421 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1422 {
1423 struct acpi_video_bus *video = acpi_driver_data(device);
1424 struct input_dev *input;
1425 int keycode = 0;
1426
1427 if (!video || !video->input)
1428 return;
1429
1430 input = video->input;
1431
1432 switch (event) {
1433 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1434 * most likely via hotkey. */
1435 keycode = KEY_SWITCHVIDEOMODE;
1436 break;
1437
1438 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1439 * connector. */
1440 acpi_video_device_enumerate(video);
1441 acpi_video_device_rebind(video);
1442 keycode = KEY_SWITCHVIDEOMODE;
1443 break;
1444
1445 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1446 keycode = KEY_SWITCHVIDEOMODE;
1447 break;
1448 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1449 keycode = KEY_VIDEO_NEXT;
1450 break;
1451 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1452 keycode = KEY_VIDEO_PREV;
1453 break;
1454
1455 default:
1456 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1457 "Unsupported event [0x%x]\n", event));
1458 break;
1459 }
1460
1461 if (acpi_notifier_call_chain(device, event, 0))
1462 /* Something vetoed the keypress. */
1463 keycode = 0;
1464
1465 if (keycode) {
1466 input_report_key(input, keycode, 1);
1467 input_sync(input);
1468 input_report_key(input, keycode, 0);
1469 input_sync(input);
1470 }
1471
1472 return;
1473 }
1474
1475 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1476 {
1477 struct acpi_video_device *video_device = data;
1478 struct acpi_device *device = NULL;
1479 struct acpi_video_bus *bus;
1480 struct input_dev *input;
1481 int keycode = 0;
1482
1483 if (!video_device)
1484 return;
1485
1486 device = video_device->dev;
1487 bus = video_device->video;
1488 input = bus->input;
1489
1490 switch (event) {
1491 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1492 if (brightness_switch_enabled)
1493 acpi_video_switch_brightness(video_device, event);
1494 keycode = KEY_BRIGHTNESS_CYCLE;
1495 break;
1496 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1497 if (brightness_switch_enabled)
1498 acpi_video_switch_brightness(video_device, event);
1499 keycode = KEY_BRIGHTNESSUP;
1500 break;
1501 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1502 if (brightness_switch_enabled)
1503 acpi_video_switch_brightness(video_device, event);
1504 keycode = KEY_BRIGHTNESSDOWN;
1505 break;
1506 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1507 if (brightness_switch_enabled)
1508 acpi_video_switch_brightness(video_device, event);
1509 keycode = KEY_BRIGHTNESS_ZERO;
1510 break;
1511 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1512 if (brightness_switch_enabled)
1513 acpi_video_switch_brightness(video_device, event);
1514 keycode = KEY_DISPLAY_OFF;
1515 break;
1516 default:
1517 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1518 "Unsupported event [0x%x]\n", event));
1519 break;
1520 }
1521
1522 acpi_notifier_call_chain(device, event, 0);
1523
1524 if (keycode) {
1525 input_report_key(input, keycode, 1);
1526 input_sync(input);
1527 input_report_key(input, keycode, 0);
1528 input_sync(input);
1529 }
1530
1531 return;
1532 }
1533
1534 static int acpi_video_resume(struct notifier_block *nb,
1535 unsigned long val, void *ign)
1536 {
1537 struct acpi_video_bus *video;
1538 struct acpi_video_device *video_device;
1539 int i;
1540
1541 switch (val) {
1542 case PM_HIBERNATION_PREPARE:
1543 case PM_SUSPEND_PREPARE:
1544 case PM_RESTORE_PREPARE:
1545 return NOTIFY_DONE;
1546 }
1547
1548 video = container_of(nb, struct acpi_video_bus, pm_nb);
1549
1550 dev_info(&video->device->dev, "Restoring backlight state\n");
1551
1552 for (i = 0; i < video->attached_count; i++) {
1553 video_device = video->attached_array[i].bind_info;
1554 if (video_device && video_device->backlight)
1555 acpi_video_set_brightness(video_device->backlight);
1556 }
1557
1558 return NOTIFY_OK;
1559 }
1560
1561 static acpi_status
1562 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1563 void **return_value)
1564 {
1565 struct acpi_device *device = context;
1566 struct acpi_device *sibling;
1567 int result;
1568
1569 if (handle == device->handle)
1570 return AE_CTRL_TERMINATE;
1571
1572 result = acpi_bus_get_device(handle, &sibling);
1573 if (result)
1574 return AE_OK;
1575
1576 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1577 return AE_ALREADY_EXISTS;
1578
1579 return AE_OK;
1580 }
1581
1582 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1583 {
1584 if (acpi_video_verify_backlight_support()) {
1585 struct backlight_properties props;
1586 struct pci_dev *pdev;
1587 acpi_handle acpi_parent;
1588 struct device *parent = NULL;
1589 int result;
1590 static int count;
1591 char *name;
1592
1593 result = acpi_video_init_brightness(device);
1594 if (result)
1595 return;
1596 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1597 if (!name)
1598 return;
1599 count++;
1600
1601 acpi_get_parent(device->dev->handle, &acpi_parent);
1602
1603 pdev = acpi_get_pci_dev(acpi_parent);
1604 if (pdev) {
1605 parent = &pdev->dev;
1606 pci_dev_put(pdev);
1607 }
1608
1609 memset(&props, 0, sizeof(struct backlight_properties));
1610 props.type = BACKLIGHT_FIRMWARE;
1611 props.max_brightness = device->brightness->count - 3;
1612 device->backlight = backlight_device_register(name,
1613 parent,
1614 device,
1615 &acpi_backlight_ops,
1616 &props);
1617 kfree(name);
1618 if (IS_ERR(device->backlight))
1619 return;
1620
1621 /*
1622 * Save current brightness level in case we have to restore it
1623 * before acpi_video_device_lcd_set_level() is called next time.
1624 */
1625 device->backlight->props.brightness =
1626 acpi_video_get_brightness(device->backlight);
1627
1628 device->cooling_dev = thermal_cooling_device_register("LCD",
1629 device->dev, &video_cooling_ops);
1630 if (IS_ERR(device->cooling_dev)) {
1631 /*
1632 * Set cooling_dev to NULL so we don't crash trying to
1633 * free it.
1634 * Also, why the hell we are returning early and
1635 * not attempt to register video output if cooling
1636 * device registration failed?
1637 * -- dtor
1638 */
1639 device->cooling_dev = NULL;
1640 return;
1641 }
1642
1643 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1644 device->cooling_dev->id);
1645 result = sysfs_create_link(&device->dev->dev.kobj,
1646 &device->cooling_dev->device.kobj,
1647 "thermal_cooling");
1648 if (result)
1649 printk(KERN_ERR PREFIX "Create sysfs link\n");
1650 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1651 &device->dev->dev.kobj, "device");
1652 if (result)
1653 printk(KERN_ERR PREFIX "Create sysfs link\n");
1654 }
1655 }
1656
1657 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1658 {
1659 struct acpi_video_device *dev;
1660
1661 mutex_lock(&video->device_list_lock);
1662 list_for_each_entry(dev, &video->video_device_list, entry)
1663 acpi_video_dev_register_backlight(dev);
1664 mutex_unlock(&video->device_list_lock);
1665
1666 video->pm_nb.notifier_call = acpi_video_resume;
1667 video->pm_nb.priority = 0;
1668 return register_pm_notifier(&video->pm_nb);
1669 }
1670
1671 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1672 {
1673 if (device->backlight) {
1674 backlight_device_unregister(device->backlight);
1675 device->backlight = NULL;
1676 }
1677 if (device->brightness) {
1678 kfree(device->brightness->levels);
1679 kfree(device->brightness);
1680 device->brightness = NULL;
1681 }
1682 if (device->cooling_dev) {
1683 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1684 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1685 thermal_cooling_device_unregister(device->cooling_dev);
1686 device->cooling_dev = NULL;
1687 }
1688 }
1689
1690 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1691 {
1692 struct acpi_video_device *dev;
1693 int error = unregister_pm_notifier(&video->pm_nb);
1694
1695 mutex_lock(&video->device_list_lock);
1696 list_for_each_entry(dev, &video->video_device_list, entry)
1697 acpi_video_dev_unregister_backlight(dev);
1698 mutex_unlock(&video->device_list_lock);
1699
1700 return error;
1701 }
1702
1703 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1704 {
1705 acpi_status status;
1706 struct acpi_device *adev = device->dev;
1707
1708 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1709 acpi_video_device_notify, device);
1710 if (ACPI_FAILURE(status))
1711 dev_err(&adev->dev, "Error installing notify handler\n");
1712 else
1713 device->flags.notify = 1;
1714 }
1715
1716 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1717 {
1718 struct input_dev *input;
1719 struct acpi_video_device *dev;
1720 int error;
1721
1722 video->input = input = input_allocate_device();
1723 if (!input) {
1724 error = -ENOMEM;
1725 goto out;
1726 }
1727
1728 error = acpi_video_bus_start_devices(video);
1729 if (error)
1730 goto err_free_input;
1731
1732 snprintf(video->phys, sizeof(video->phys),
1733 "%s/video/input0", acpi_device_hid(video->device));
1734
1735 input->name = acpi_device_name(video->device);
1736 input->phys = video->phys;
1737 input->id.bustype = BUS_HOST;
1738 input->id.product = 0x06;
1739 input->dev.parent = &video->device->dev;
1740 input->evbit[0] = BIT(EV_KEY);
1741 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1742 set_bit(KEY_VIDEO_NEXT, input->keybit);
1743 set_bit(KEY_VIDEO_PREV, input->keybit);
1744 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1745 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1746 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1747 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1748 set_bit(KEY_DISPLAY_OFF, input->keybit);
1749
1750 error = input_register_device(input);
1751 if (error)
1752 goto err_stop_dev;
1753
1754 mutex_lock(&video->device_list_lock);
1755 list_for_each_entry(dev, &video->video_device_list, entry)
1756 acpi_video_dev_add_notify_handler(dev);
1757 mutex_unlock(&video->device_list_lock);
1758
1759 return 0;
1760
1761 err_stop_dev:
1762 acpi_video_bus_stop_devices(video);
1763 err_free_input:
1764 input_free_device(input);
1765 video->input = NULL;
1766 out:
1767 return error;
1768 }
1769
1770 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1771 {
1772 if (dev->flags.notify) {
1773 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1774 acpi_video_device_notify);
1775 dev->flags.notify = 0;
1776 }
1777 }
1778
1779 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1780 {
1781 struct acpi_video_device *dev;
1782
1783 mutex_lock(&video->device_list_lock);
1784 list_for_each_entry(dev, &video->video_device_list, entry)
1785 acpi_video_dev_remove_notify_handler(dev);
1786 mutex_unlock(&video->device_list_lock);
1787
1788 acpi_video_bus_stop_devices(video);
1789 input_unregister_device(video->input);
1790 video->input = NULL;
1791 }
1792
1793 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1794 {
1795 struct acpi_video_device *dev, *next;
1796
1797 mutex_lock(&video->device_list_lock);
1798 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1799 list_del(&dev->entry);
1800 kfree(dev);
1801 }
1802 mutex_unlock(&video->device_list_lock);
1803
1804 return 0;
1805 }
1806
1807 static int instance;
1808
1809 static int acpi_video_bus_add(struct acpi_device *device)
1810 {
1811 struct acpi_video_bus *video;
1812 int error;
1813 acpi_status status;
1814
1815 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1816 device->parent->handle, 1,
1817 acpi_video_bus_match, NULL,
1818 device, NULL);
1819 if (status == AE_ALREADY_EXISTS) {
1820 printk(KERN_WARNING FW_BUG
1821 "Duplicate ACPI video bus devices for the"
1822 " same VGA controller, please try module "
1823 "parameter \"video.allow_duplicates=1\""
1824 "if the current driver doesn't work.\n");
1825 if (!allow_duplicates)
1826 return -ENODEV;
1827 }
1828
1829 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1830 if (!video)
1831 return -ENOMEM;
1832
1833 /* a hack to fix the duplicate name "VID" problem on T61 */
1834 if (!strcmp(device->pnp.bus_id, "VID")) {
1835 if (instance)
1836 device->pnp.bus_id[3] = '0' + instance;
1837 instance++;
1838 }
1839 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1840 if (!strcmp(device->pnp.bus_id, "VGA")) {
1841 if (instance)
1842 device->pnp.bus_id[3] = '0' + instance;
1843 instance++;
1844 }
1845
1846 video->device = device;
1847 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1848 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1849 device->driver_data = video;
1850
1851 acpi_video_bus_find_cap(video);
1852 error = acpi_video_bus_check(video);
1853 if (error)
1854 goto err_free_video;
1855
1856 mutex_init(&video->device_list_lock);
1857 INIT_LIST_HEAD(&video->video_device_list);
1858
1859 error = acpi_video_bus_get_devices(video, device);
1860 if (error)
1861 goto err_put_video;
1862
1863 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
1864 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1865 video->flags.multihead ? "yes" : "no",
1866 video->flags.rom ? "yes" : "no",
1867 video->flags.post ? "yes" : "no");
1868 mutex_lock(&video_list_lock);
1869 list_add_tail(&video->entry, &video_bus_head);
1870 mutex_unlock(&video_list_lock);
1871
1872 acpi_video_bus_register_backlight(video);
1873 acpi_video_bus_add_notify_handler(video);
1874
1875 return 0;
1876
1877 err_put_video:
1878 acpi_video_bus_put_devices(video);
1879 kfree(video->attached_array);
1880 err_free_video:
1881 kfree(video);
1882 device->driver_data = NULL;
1883
1884 return error;
1885 }
1886
1887 static int acpi_video_bus_remove(struct acpi_device *device)
1888 {
1889 struct acpi_video_bus *video = NULL;
1890
1891
1892 if (!device || !acpi_driver_data(device))
1893 return -EINVAL;
1894
1895 video = acpi_driver_data(device);
1896
1897 acpi_video_bus_remove_notify_handler(video);
1898 acpi_video_bus_unregister_backlight(video);
1899 acpi_video_bus_put_devices(video);
1900
1901 mutex_lock(&video_list_lock);
1902 list_del(&video->entry);
1903 mutex_unlock(&video_list_lock);
1904
1905 kfree(video->attached_array);
1906 kfree(video);
1907
1908 return 0;
1909 }
1910
1911 static int __init is_i740(struct pci_dev *dev)
1912 {
1913 if (dev->device == 0x00D1)
1914 return 1;
1915 if (dev->device == 0x7000)
1916 return 1;
1917 return 0;
1918 }
1919
1920 static int __init intel_opregion_present(void)
1921 {
1922 int opregion = 0;
1923 struct pci_dev *dev = NULL;
1924 u32 address;
1925
1926 for_each_pci_dev(dev) {
1927 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1928 continue;
1929 if (dev->vendor != PCI_VENDOR_ID_INTEL)
1930 continue;
1931 /* We don't want to poke around undefined i740 registers */
1932 if (is_i740(dev))
1933 continue;
1934 pci_read_config_dword(dev, 0xfc, &address);
1935 if (!address)
1936 continue;
1937 opregion = 1;
1938 }
1939 return opregion;
1940 }
1941
1942 int acpi_video_register(void)
1943 {
1944 int result = 0;
1945 if (register_count) {
1946 /*
1947 * if the function of acpi_video_register is already called,
1948 * don't register the acpi_vide_bus again and return no error.
1949 */
1950 return 0;
1951 }
1952
1953 mutex_init(&video_list_lock);
1954 INIT_LIST_HEAD(&video_bus_head);
1955
1956 result = acpi_bus_register_driver(&acpi_video_bus);
1957 if (result < 0)
1958 return -ENODEV;
1959
1960 /*
1961 * When the acpi_video_bus is loaded successfully, increase
1962 * the counter reference.
1963 */
1964 register_count = 1;
1965
1966 return 0;
1967 }
1968 EXPORT_SYMBOL(acpi_video_register);
1969
1970 void acpi_video_unregister(void)
1971 {
1972 if (!register_count) {
1973 /*
1974 * If the acpi video bus is already unloaded, don't
1975 * unload it again and return directly.
1976 */
1977 return;
1978 }
1979 acpi_bus_unregister_driver(&acpi_video_bus);
1980
1981 register_count = 0;
1982
1983 return;
1984 }
1985 EXPORT_SYMBOL(acpi_video_unregister);
1986
1987 /*
1988 * This is kind of nasty. Hardware using Intel chipsets may require
1989 * the video opregion code to be run first in order to initialise
1990 * state before any ACPI video calls are made. To handle this we defer
1991 * registration of the video class until the opregion code has run.
1992 */
1993
1994 static int __init acpi_video_init(void)
1995 {
1996 dmi_check_system(video_dmi_table);
1997
1998 if (intel_opregion_present())
1999 return 0;
2000
2001 return acpi_video_register();
2002 }
2003
2004 static void __exit acpi_video_exit(void)
2005 {
2006 acpi_video_unregister();
2007
2008 return;
2009 }
2010
2011 module_init(acpi_video_init);
2012 module_exit(acpi_video_exit);
Linux kernel - Deliverables
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