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