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Merge tag 'nfs-for-3.13-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs
[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 int acpi_video_bus_add(struct acpi_device *device);
93 static int acpi_video_bus_remove(struct acpi_device *device);
94 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
95
96 static const struct acpi_device_id video_device_ids[] = {
97 {ACPI_VIDEO_HID, 0},
98 {"", 0},
99 };
100 MODULE_DEVICE_TABLE(acpi, video_device_ids);
101
102 static struct acpi_driver acpi_video_bus = {
103 .name = "video",
104 .class = ACPI_VIDEO_CLASS,
105 .ids = video_device_ids,
106 .ops = {
107 .add = acpi_video_bus_add,
108 .remove = acpi_video_bus_remove,
109 .notify = acpi_video_bus_notify,
110 },
111 };
112
113 struct acpi_video_bus_flags {
114 u8 multihead:1; /* can switch video heads */
115 u8 rom:1; /* can retrieve a video rom */
116 u8 post:1; /* can configure the head to */
117 u8 reserved:5;
118 };
119
120 struct acpi_video_bus_cap {
121 u8 _DOS:1; /* Enable/Disable output switching */
122 u8 _DOD:1; /* Enumerate all devices attached to display adapter */
123 u8 _ROM:1; /* Get ROM Data */
124 u8 _GPD:1; /* Get POST Device */
125 u8 _SPD:1; /* Set POST Device */
126 u8 _VPO:1; /* Video POST Options */
127 u8 reserved:2;
128 };
129
130 struct acpi_video_device_attrib {
131 u32 display_index:4; /* A zero-based instance of the Display */
132 u32 display_port_attachment:4; /* This field differentiates the display type */
133 u32 display_type:4; /* Describe the specific type in use */
134 u32 vendor_specific:4; /* Chipset Vendor Specific */
135 u32 bios_can_detect:1; /* BIOS can detect the device */
136 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to
137 the VGA device. */
138 u32 pipe_id:3; /* For VGA multiple-head devices. */
139 u32 reserved:10; /* Must be 0 */
140 u32 device_id_scheme:1; /* Device ID Scheme */
141 };
142
143 struct acpi_video_enumerated_device {
144 union {
145 u32 int_val;
146 struct acpi_video_device_attrib attrib;
147 } value;
148 struct acpi_video_device *bind_info;
149 };
150
151 struct acpi_video_bus {
152 struct acpi_device *device;
153 u8 dos_setting;
154 struct acpi_video_enumerated_device *attached_array;
155 u8 attached_count;
156 struct acpi_video_bus_cap cap;
157 struct acpi_video_bus_flags flags;
158 struct list_head video_device_list;
159 struct mutex device_list_lock; /* protects video_device_list */
160 struct input_dev *input;
161 char phys[32]; /* for input device */
162 struct notifier_block pm_nb;
163 };
164
165 struct acpi_video_device_flags {
166 u8 crt:1;
167 u8 lcd:1;
168 u8 tvout:1;
169 u8 dvi:1;
170 u8 bios:1;
171 u8 unknown:1;
172 u8 notify:1;
173 u8 reserved:1;
174 };
175
176 struct acpi_video_device_cap {
177 u8 _ADR:1; /* Return the unique ID */
178 u8 _BCL:1; /* Query list of brightness control levels supported */
179 u8 _BCM:1; /* Set the brightness level */
180 u8 _BQC:1; /* Get current brightness level */
181 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
182 u8 _DDC:1; /* Return the EDID for this device */
183 };
184
185 struct acpi_video_brightness_flags {
186 u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
187 u8 _BCL_reversed:1; /* _BCL package is in a reversed order */
188 u8 _BQC_use_index:1; /* _BQC returns an index value */
189 };
190
191 struct acpi_video_device_brightness {
192 int curr;
193 int count;
194 int *levels;
195 struct acpi_video_brightness_flags flags;
196 };
197
198 struct acpi_video_device {
199 unsigned long device_id;
200 struct acpi_video_device_flags flags;
201 struct acpi_video_device_cap cap;
202 struct list_head entry;
203 struct acpi_video_bus *video;
204 struct acpi_device *dev;
205 struct acpi_video_device_brightness *brightness;
206 struct backlight_device *backlight;
207 struct thermal_cooling_device *cooling_dev;
208 };
209
210 static const char device_decode[][30] = {
211 "motherboard VGA device",
212 "PCI VGA device",
213 "AGP VGA device",
214 "UNKNOWN",
215 };
216
217 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
218 static void acpi_video_device_rebind(struct acpi_video_bus *video);
219 static void acpi_video_device_bind(struct acpi_video_bus *video,
220 struct acpi_video_device *device);
221 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
222 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
223 int level);
224 static int acpi_video_device_lcd_get_level_current(
225 struct acpi_video_device *device,
226 unsigned long long *level, bool raw);
227 static int acpi_video_get_next_level(struct acpi_video_device *device,
228 u32 level_current, u32 event);
229 static int acpi_video_switch_brightness(struct acpi_video_device *device,
230 int event);
231
232 /* backlight device sysfs support */
233 static int acpi_video_get_brightness(struct backlight_device *bd)
234 {
235 unsigned long long cur_level;
236 int i;
237 struct acpi_video_device *vd = bl_get_data(bd);
238
239 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
240 return -EINVAL;
241 for (i = 2; i < vd->brightness->count; i++) {
242 if (vd->brightness->levels[i] == cur_level)
243 /*
244 * The first two entries are special - see page 575
245 * of the ACPI spec 3.0
246 */
247 return i - 2;
248 }
249 return 0;
250 }
251
252 static int acpi_video_set_brightness(struct backlight_device *bd)
253 {
254 int request_level = bd->props.brightness + 2;
255 struct acpi_video_device *vd = bl_get_data(bd);
256
257 return acpi_video_device_lcd_set_level(vd,
258 vd->brightness->levels[request_level]);
259 }
260
261 static const struct backlight_ops acpi_backlight_ops = {
262 .get_brightness = acpi_video_get_brightness,
263 .update_status = acpi_video_set_brightness,
264 };
265
266 /* thermal cooling device callbacks */
267 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
268 long *state)
269 {
270 struct acpi_device *device = cooling_dev->devdata;
271 struct acpi_video_device *video = acpi_driver_data(device);
272
273 *state = video->brightness->count - 3;
274 return 0;
275 }
276
277 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
278 long *state)
279 {
280 struct acpi_device *device = cooling_dev->devdata;
281 struct acpi_video_device *video = acpi_driver_data(device);
282 unsigned long long level;
283 int offset;
284
285 if (acpi_video_device_lcd_get_level_current(video, &level, false))
286 return -EINVAL;
287 for (offset = 2; offset < video->brightness->count; offset++)
288 if (level == video->brightness->levels[offset]) {
289 *state = video->brightness->count - offset - 1;
290 return 0;
291 }
292
293 return -EINVAL;
294 }
295
296 static int
297 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
298 {
299 struct acpi_device *device = cooling_dev->devdata;
300 struct acpi_video_device *video = acpi_driver_data(device);
301 int level;
302
303 if (state >= video->brightness->count - 2)
304 return -EINVAL;
305
306 state = video->brightness->count - state;
307 level = video->brightness->levels[state - 1];
308 return acpi_video_device_lcd_set_level(video, level);
309 }
310
311 static const struct thermal_cooling_device_ops video_cooling_ops = {
312 .get_max_state = video_get_max_state,
313 .get_cur_state = video_get_cur_state,
314 .set_cur_state = video_set_cur_state,
315 };
316
317 /*
318 * --------------------------------------------------------------------------
319 * Video Management
320 * --------------------------------------------------------------------------
321 */
322
323 static int
324 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
325 union acpi_object **levels)
326 {
327 int status;
328 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
329 union acpi_object *obj;
330
331
332 *levels = NULL;
333
334 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
335 if (!ACPI_SUCCESS(status))
336 return status;
337 obj = (union acpi_object *)buffer.pointer;
338 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
339 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
340 status = -EFAULT;
341 goto err;
342 }
343
344 *levels = obj;
345
346 return 0;
347
348 err:
349 kfree(buffer.pointer);
350
351 return status;
352 }
353
354 static int
355 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
356 {
357 int status;
358 int state;
359
360 status = acpi_execute_simple_method(device->dev->handle,
361 "_BCM", level);
362 if (ACPI_FAILURE(status)) {
363 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
364 return -EIO;
365 }
366
367 device->brightness->curr = level;
368 for (state = 2; state < device->brightness->count; state++)
369 if (level == device->brightness->levels[state]) {
370 if (device->backlight)
371 device->backlight->props.brightness = state - 2;
372 return 0;
373 }
374
375 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
376 return -EINVAL;
377 }
378
379 /*
380 * For some buggy _BQC methods, we need to add a constant value to
381 * the _BQC return value to get the actual current brightness level
382 */
383
384 static int bqc_offset_aml_bug_workaround;
385 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
386 {
387 bqc_offset_aml_bug_workaround = 9;
388 return 0;
389 }
390
391 static int video_ignore_initial_backlight(const struct dmi_system_id *d)
392 {
393 use_bios_initial_backlight = 0;
394 return 0;
395 }
396
397 static struct dmi_system_id video_dmi_table[] __initdata = {
398 /*
399 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
400 */
401 {
402 .callback = video_set_bqc_offset,
403 .ident = "Acer Aspire 5720",
404 .matches = {
405 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
406 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
407 },
408 },
409 {
410 .callback = video_set_bqc_offset,
411 .ident = "Acer Aspire 5710Z",
412 .matches = {
413 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
414 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
415 },
416 },
417 {
418 .callback = video_set_bqc_offset,
419 .ident = "eMachines E510",
420 .matches = {
421 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
422 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
423 },
424 },
425 {
426 .callback = video_set_bqc_offset,
427 .ident = "Acer Aspire 5315",
428 .matches = {
429 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
430 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
431 },
432 },
433 {
434 .callback = video_set_bqc_offset,
435 .ident = "Acer Aspire 7720",
436 .matches = {
437 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
438 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
439 },
440 },
441 {
442 .callback = video_ignore_initial_backlight,
443 .ident = "HP Folio 13-2000",
444 .matches = {
445 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
446 DMI_MATCH(DMI_PRODUCT_NAME, "HP Folio 13 - 2000 Notebook PC"),
447 },
448 },
449 {
450 .callback = video_ignore_initial_backlight,
451 .ident = "Fujitsu E753",
452 .matches = {
453 DMI_MATCH(DMI_BOARD_VENDOR, "FUJITSU"),
454 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E753"),
455 },
456 },
457 {
458 .callback = video_ignore_initial_backlight,
459 .ident = "HP Pavilion dm4",
460 .matches = {
461 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
462 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion dm4 Notebook PC"),
463 },
464 },
465 {
466 .callback = video_ignore_initial_backlight,
467 .ident = "HP Pavilion g6 Notebook PC",
468 .matches = {
469 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
470 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion g6 Notebook PC"),
471 },
472 },
473 {
474 .callback = video_ignore_initial_backlight,
475 .ident = "HP 1000 Notebook PC",
476 .matches = {
477 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
478 DMI_MATCH(DMI_PRODUCT_NAME, "HP 1000 Notebook PC"),
479 },
480 },
481 {
482 .callback = video_ignore_initial_backlight,
483 .ident = "HP Pavilion m4",
484 .matches = {
485 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
486 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion m4 Notebook PC"),
487 },
488 },
489 {}
490 };
491
492 static unsigned long long
493 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
494 unsigned long long bqc_value)
495 {
496 unsigned long long level;
497
498 if (device->brightness->flags._BQC_use_index) {
499 /*
500 * _BQC returns an index that doesn't account for
501 * the first 2 items with special meaning, so we need
502 * to compensate for that by offsetting ourselves
503 */
504 if (device->brightness->flags._BCL_reversed)
505 bqc_value = device->brightness->count - 3 - bqc_value;
506
507 level = device->brightness->levels[bqc_value + 2];
508 } else {
509 level = bqc_value;
510 }
511
512 level += bqc_offset_aml_bug_workaround;
513
514 return level;
515 }
516
517 static int
518 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
519 unsigned long long *level, bool raw)
520 {
521 acpi_status status = AE_OK;
522 int i;
523
524 if (device->cap._BQC || device->cap._BCQ) {
525 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
526
527 status = acpi_evaluate_integer(device->dev->handle, buf,
528 NULL, level);
529 if (ACPI_SUCCESS(status)) {
530 if (raw) {
531 /*
532 * Caller has indicated he wants the raw
533 * value returned by _BQC, so don't furtherly
534 * mess with the value.
535 */
536 return 0;
537 }
538
539 *level = acpi_video_bqc_value_to_level(device, *level);
540
541 for (i = 2; i < device->brightness->count; i++)
542 if (device->brightness->levels[i] == *level) {
543 device->brightness->curr = *level;
544 return 0;
545 }
546 /*
547 * BQC returned an invalid level.
548 * Stop using it.
549 */
550 ACPI_WARNING((AE_INFO,
551 "%s returned an invalid level",
552 buf));
553 device->cap._BQC = device->cap._BCQ = 0;
554 } else {
555 /*
556 * Fixme:
557 * should we return an error or ignore this failure?
558 * dev->brightness->curr is a cached value which stores
559 * the correct current backlight level in most cases.
560 * ACPI video backlight still works w/ buggy _BQC.
561 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
562 */
563 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
564 device->cap._BQC = device->cap._BCQ = 0;
565 }
566 }
567
568 *level = device->brightness->curr;
569 return 0;
570 }
571
572 static int
573 acpi_video_device_EDID(struct acpi_video_device *device,
574 union acpi_object **edid, ssize_t length)
575 {
576 int status;
577 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
578 union acpi_object *obj;
579 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
580 struct acpi_object_list args = { 1, &arg0 };
581
582
583 *edid = NULL;
584
585 if (!device)
586 return -ENODEV;
587 if (length == 128)
588 arg0.integer.value = 1;
589 else if (length == 256)
590 arg0.integer.value = 2;
591 else
592 return -EINVAL;
593
594 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
595 if (ACPI_FAILURE(status))
596 return -ENODEV;
597
598 obj = buffer.pointer;
599
600 if (obj && obj->type == ACPI_TYPE_BUFFER)
601 *edid = obj;
602 else {
603 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
604 status = -EFAULT;
605 kfree(obj);
606 }
607
608 return status;
609 }
610
611 /* bus */
612
613 /*
614 * Arg:
615 * video : video bus device pointer
616 * bios_flag :
617 * 0. The system BIOS should NOT automatically switch(toggle)
618 * the active display output.
619 * 1. The system BIOS should automatically switch (toggle) the
620 * active display output. No switch event.
621 * 2. The _DGS value should be locked.
622 * 3. The system BIOS should not automatically switch (toggle) the
623 * active display output, but instead generate the display switch
624 * event notify code.
625 * lcd_flag :
626 * 0. The system BIOS should automatically control the brightness level
627 * of the LCD when the power changes from AC to DC
628 * 1. The system BIOS should NOT automatically control the brightness
629 * level of the LCD when the power changes from AC to DC.
630 * Return Value:
631 * -EINVAL wrong arg.
632 */
633
634 static int
635 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
636 {
637 acpi_status status;
638
639 if (!video->cap._DOS)
640 return 0;
641
642 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
643 return -EINVAL;
644 video->dos_setting = (lcd_flag << 2) | bios_flag;
645 status = acpi_execute_simple_method(video->device->handle, "_DOS",
646 (lcd_flag << 2) | bios_flag);
647 if (ACPI_FAILURE(status))
648 return -EIO;
649
650 return 0;
651 }
652
653 /*
654 * Simple comparison function used to sort backlight levels.
655 */
656
657 static int
658 acpi_video_cmp_level(const void *a, const void *b)
659 {
660 return *(int *)a - *(int *)b;
661 }
662
663 /*
664 * Decides if _BQC/_BCQ for this system is usable
665 *
666 * We do this by changing the level first and then read out the current
667 * brightness level, if the value does not match, find out if it is using
668 * index. If not, clear the _BQC/_BCQ capability.
669 */
670 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
671 int max_level, int current_level)
672 {
673 struct acpi_video_device_brightness *br = device->brightness;
674 int result;
675 unsigned long long level;
676 int test_level;
677
678 /* don't mess with existing known broken systems */
679 if (bqc_offset_aml_bug_workaround)
680 return 0;
681
682 /*
683 * Some systems always report current brightness level as maximum
684 * through _BQC, we need to test another value for them.
685 */
686 test_level = current_level == max_level ? br->levels[3] : max_level;
687
688 result = acpi_video_device_lcd_set_level(device, test_level);
689 if (result)
690 return result;
691
692 result = acpi_video_device_lcd_get_level_current(device, &level, true);
693 if (result)
694 return result;
695
696 if (level != test_level) {
697 /* buggy _BQC found, need to find out if it uses index */
698 if (level < br->count) {
699 if (br->flags._BCL_reversed)
700 level = br->count - 3 - level;
701 if (br->levels[level + 2] == test_level)
702 br->flags._BQC_use_index = 1;
703 }
704
705 if (!br->flags._BQC_use_index)
706 device->cap._BQC = device->cap._BCQ = 0;
707 }
708
709 return 0;
710 }
711
712
713 /*
714 * Arg:
715 * device : video output device (LCD, CRT, ..)
716 *
717 * Return Value:
718 * Maximum brightness level
719 *
720 * Allocate and initialize device->brightness.
721 */
722
723 static int
724 acpi_video_init_brightness(struct acpi_video_device *device)
725 {
726 union acpi_object *obj = NULL;
727 int i, max_level = 0, count = 0, level_ac_battery = 0;
728 unsigned long long level, level_old;
729 union acpi_object *o;
730 struct acpi_video_device_brightness *br = NULL;
731 int result = -EINVAL;
732
733 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
734 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
735 "LCD brightness level\n"));
736 goto out;
737 }
738
739 if (obj->package.count < 2)
740 goto out;
741
742 br = kzalloc(sizeof(*br), GFP_KERNEL);
743 if (!br) {
744 printk(KERN_ERR "can't allocate memory\n");
745 result = -ENOMEM;
746 goto out;
747 }
748
749 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
750 GFP_KERNEL);
751 if (!br->levels) {
752 result = -ENOMEM;
753 goto out_free;
754 }
755
756 for (i = 0; i < obj->package.count; i++) {
757 o = (union acpi_object *)&obj->package.elements[i];
758 if (o->type != ACPI_TYPE_INTEGER) {
759 printk(KERN_ERR PREFIX "Invalid data\n");
760 continue;
761 }
762 br->levels[count] = (u32) o->integer.value;
763
764 if (br->levels[count] > max_level)
765 max_level = br->levels[count];
766 count++;
767 }
768
769 /*
770 * some buggy BIOS don't export the levels
771 * when machine is on AC/Battery in _BCL package.
772 * In this case, the first two elements in _BCL packages
773 * are also supported brightness levels that OS should take care of.
774 */
775 for (i = 2; i < count; i++) {
776 if (br->levels[i] == br->levels[0])
777 level_ac_battery++;
778 if (br->levels[i] == br->levels[1])
779 level_ac_battery++;
780 }
781
782 if (level_ac_battery < 2) {
783 level_ac_battery = 2 - level_ac_battery;
784 br->flags._BCL_no_ac_battery_levels = 1;
785 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
786 br->levels[i] = br->levels[i - level_ac_battery];
787 count += level_ac_battery;
788 } else if (level_ac_battery > 2)
789 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
790
791 /* Check if the _BCL package is in a reversed order */
792 if (max_level == br->levels[2]) {
793 br->flags._BCL_reversed = 1;
794 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
795 acpi_video_cmp_level, NULL);
796 } else if (max_level != br->levels[count - 1])
797 ACPI_ERROR((AE_INFO,
798 "Found unordered _BCL package"));
799
800 br->count = count;
801 device->brightness = br;
802
803 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
804 br->curr = level = max_level;
805
806 if (!device->cap._BQC)
807 goto set_level;
808
809 result = acpi_video_device_lcd_get_level_current(device,
810 &level_old, true);
811 if (result)
812 goto out_free_levels;
813
814 result = acpi_video_bqc_quirk(device, max_level, level_old);
815 if (result)
816 goto out_free_levels;
817 /*
818 * cap._BQC may get cleared due to _BQC is found to be broken
819 * in acpi_video_bqc_quirk, so check again here.
820 */
821 if (!device->cap._BQC)
822 goto set_level;
823
824 if (use_bios_initial_backlight) {
825 level = acpi_video_bqc_value_to_level(device, level_old);
826 /*
827 * On some buggy laptops, _BQC returns an uninitialized
828 * value when invoked for the first time, i.e.
829 * level_old is invalid (no matter whether it's a level
830 * or an index). Set the backlight to max_level in this case.
831 */
832 for (i = 2; i < br->count; i++)
833 if (level_old == br->levels[i])
834 break;
835 if (i == br->count)
836 level = max_level;
837 }
838
839 set_level:
840 result = acpi_video_device_lcd_set_level(device, level);
841 if (result)
842 goto out_free_levels;
843
844 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
845 "found %d brightness levels\n", count - 2));
846 kfree(obj);
847 return result;
848
849 out_free_levels:
850 kfree(br->levels);
851 out_free:
852 kfree(br);
853 out:
854 device->brightness = NULL;
855 kfree(obj);
856 return result;
857 }
858
859 /*
860 * Arg:
861 * device : video output device (LCD, CRT, ..)
862 *
863 * Return Value:
864 * None
865 *
866 * Find out all required AML methods defined under the output
867 * device.
868 */
869
870 static void acpi_video_device_find_cap(struct acpi_video_device *device)
871 {
872 if (acpi_has_method(device->dev->handle, "_ADR"))
873 device->cap._ADR = 1;
874 if (acpi_has_method(device->dev->handle, "_BCL"))
875 device->cap._BCL = 1;
876 if (acpi_has_method(device->dev->handle, "_BCM"))
877 device->cap._BCM = 1;
878 if (acpi_has_method(device->dev->handle, "_BQC")) {
879 device->cap._BQC = 1;
880 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
881 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
882 device->cap._BCQ = 1;
883 }
884
885 if (acpi_has_method(device->dev->handle, "_DDC"))
886 device->cap._DDC = 1;
887
888 if (acpi_video_backlight_support()) {
889 struct backlight_properties props;
890 struct pci_dev *pdev;
891 acpi_handle acpi_parent;
892 struct device *parent = NULL;
893 int result;
894 static int count;
895 char *name;
896
897 result = acpi_video_init_brightness(device);
898 if (result)
899 return;
900 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
901 if (!name)
902 return;
903 count++;
904
905 acpi_get_parent(device->dev->handle, &acpi_parent);
906
907 pdev = acpi_get_pci_dev(acpi_parent);
908 if (pdev) {
909 parent = &pdev->dev;
910 pci_dev_put(pdev);
911 }
912
913 memset(&props, 0, sizeof(struct backlight_properties));
914 props.type = BACKLIGHT_FIRMWARE;
915 props.max_brightness = device->brightness->count - 3;
916 device->backlight = backlight_device_register(name,
917 parent,
918 device,
919 &acpi_backlight_ops,
920 &props);
921 kfree(name);
922 if (IS_ERR(device->backlight))
923 return;
924
925 /*
926 * Save current brightness level in case we have to restore it
927 * before acpi_video_device_lcd_set_level() is called next time.
928 */
929 device->backlight->props.brightness =
930 acpi_video_get_brightness(device->backlight);
931
932 device->cooling_dev = thermal_cooling_device_register("LCD",
933 device->dev, &video_cooling_ops);
934 if (IS_ERR(device->cooling_dev)) {
935 /*
936 * Set cooling_dev to NULL so we don't crash trying to
937 * free it.
938 * Also, why the hell we are returning early and
939 * not attempt to register video output if cooling
940 * device registration failed?
941 * -- dtor
942 */
943 device->cooling_dev = NULL;
944 return;
945 }
946
947 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
948 device->cooling_dev->id);
949 result = sysfs_create_link(&device->dev->dev.kobj,
950 &device->cooling_dev->device.kobj,
951 "thermal_cooling");
952 if (result)
953 printk(KERN_ERR PREFIX "Create sysfs link\n");
954 result = sysfs_create_link(&device->cooling_dev->device.kobj,
955 &device->dev->dev.kobj, "device");
956 if (result)
957 printk(KERN_ERR PREFIX "Create sysfs link\n");
958
959 }
960 }
961
962 /*
963 * Arg:
964 * device : video output device (VGA)
965 *
966 * Return Value:
967 * None
968 *
969 * Find out all required AML methods defined under the video bus device.
970 */
971
972 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
973 {
974 if (acpi_has_method(video->device->handle, "_DOS"))
975 video->cap._DOS = 1;
976 if (acpi_has_method(video->device->handle, "_DOD"))
977 video->cap._DOD = 1;
978 if (acpi_has_method(video->device->handle, "_ROM"))
979 video->cap._ROM = 1;
980 if (acpi_has_method(video->device->handle, "_GPD"))
981 video->cap._GPD = 1;
982 if (acpi_has_method(video->device->handle, "_SPD"))
983 video->cap._SPD = 1;
984 if (acpi_has_method(video->device->handle, "_VPO"))
985 video->cap._VPO = 1;
986 }
987
988 /*
989 * Check whether the video bus device has required AML method to
990 * support the desired features
991 */
992
993 static int acpi_video_bus_check(struct acpi_video_bus *video)
994 {
995 acpi_status status = -ENOENT;
996 struct pci_dev *dev;
997
998 if (!video)
999 return -EINVAL;
1000
1001 dev = acpi_get_pci_dev(video->device->handle);
1002 if (!dev)
1003 return -ENODEV;
1004 pci_dev_put(dev);
1005
1006 /*
1007 * Since there is no HID, CID and so on for VGA driver, we have
1008 * to check well known required nodes.
1009 */
1010
1011 /* Does this device support video switching? */
1012 if (video->cap._DOS || video->cap._DOD) {
1013 if (!video->cap._DOS) {
1014 printk(KERN_WARNING FW_BUG
1015 "ACPI(%s) defines _DOD but not _DOS\n",
1016 acpi_device_bid(video->device));
1017 }
1018 video->flags.multihead = 1;
1019 status = 0;
1020 }
1021
1022 /* Does this device support retrieving a video ROM? */
1023 if (video->cap._ROM) {
1024 video->flags.rom = 1;
1025 status = 0;
1026 }
1027
1028 /* Does this device support configuring which video device to POST? */
1029 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1030 video->flags.post = 1;
1031 status = 0;
1032 }
1033
1034 return status;
1035 }
1036
1037 /*
1038 * --------------------------------------------------------------------------
1039 * Driver Interface
1040 * --------------------------------------------------------------------------
1041 */
1042
1043 /* device interface */
1044 static struct acpi_video_device_attrib *
1045 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1046 {
1047 struct acpi_video_enumerated_device *ids;
1048 int i;
1049
1050 for (i = 0; i < video->attached_count; i++) {
1051 ids = &video->attached_array[i];
1052 if ((ids->value.int_val & 0xffff) == device_id)
1053 return &ids->value.attrib;
1054 }
1055
1056 return NULL;
1057 }
1058
1059 static int
1060 acpi_video_get_device_type(struct acpi_video_bus *video,
1061 unsigned long device_id)
1062 {
1063 struct acpi_video_enumerated_device *ids;
1064 int i;
1065
1066 for (i = 0; i < video->attached_count; i++) {
1067 ids = &video->attached_array[i];
1068 if ((ids->value.int_val & 0xffff) == device_id)
1069 return ids->value.int_val;
1070 }
1071
1072 return 0;
1073 }
1074
1075 static int
1076 acpi_video_bus_get_one_device(struct acpi_device *device,
1077 struct acpi_video_bus *video)
1078 {
1079 unsigned long long device_id;
1080 int status, device_type;
1081 struct acpi_video_device *data;
1082 struct acpi_video_device_attrib *attribute;
1083
1084 status =
1085 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1086 /* Some device omits _ADR, we skip them instead of fail */
1087 if (ACPI_FAILURE(status))
1088 return 0;
1089
1090 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1091 if (!data)
1092 return -ENOMEM;
1093
1094 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1095 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1096 device->driver_data = data;
1097
1098 data->device_id = device_id;
1099 data->video = video;
1100 data->dev = device;
1101
1102 attribute = acpi_video_get_device_attr(video, device_id);
1103
1104 if (attribute && attribute->device_id_scheme) {
1105 switch (attribute->display_type) {
1106 case ACPI_VIDEO_DISPLAY_CRT:
1107 data->flags.crt = 1;
1108 break;
1109 case ACPI_VIDEO_DISPLAY_TV:
1110 data->flags.tvout = 1;
1111 break;
1112 case ACPI_VIDEO_DISPLAY_DVI:
1113 data->flags.dvi = 1;
1114 break;
1115 case ACPI_VIDEO_DISPLAY_LCD:
1116 data->flags.lcd = 1;
1117 break;
1118 default:
1119 data->flags.unknown = 1;
1120 break;
1121 }
1122 if (attribute->bios_can_detect)
1123 data->flags.bios = 1;
1124 } else {
1125 /* Check for legacy IDs */
1126 device_type = acpi_video_get_device_type(video, device_id);
1127 /* Ignore bits 16 and 18-20 */
1128 switch (device_type & 0xffe2ffff) {
1129 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1130 data->flags.crt = 1;
1131 break;
1132 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1133 data->flags.lcd = 1;
1134 break;
1135 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1136 data->flags.tvout = 1;
1137 break;
1138 default:
1139 data->flags.unknown = 1;
1140 }
1141 }
1142
1143 acpi_video_device_bind(video, data);
1144 acpi_video_device_find_cap(data);
1145
1146 status = acpi_install_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
1147 acpi_video_device_notify, data);
1148 if (ACPI_FAILURE(status))
1149 dev_err(&device->dev, "Error installing notify handler\n");
1150 else
1151 data->flags.notify = 1;
1152
1153 mutex_lock(&video->device_list_lock);
1154 list_add_tail(&data->entry, &video->video_device_list);
1155 mutex_unlock(&video->device_list_lock);
1156
1157 return status;
1158 }
1159
1160 /*
1161 * Arg:
1162 * video : video bus device
1163 *
1164 * Return:
1165 * none
1166 *
1167 * Enumerate the video device list of the video bus,
1168 * bind the ids with the corresponding video devices
1169 * under the video bus.
1170 */
1171
1172 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1173 {
1174 struct acpi_video_device *dev;
1175
1176 mutex_lock(&video->device_list_lock);
1177
1178 list_for_each_entry(dev, &video->video_device_list, entry)
1179 acpi_video_device_bind(video, dev);
1180
1181 mutex_unlock(&video->device_list_lock);
1182 }
1183
1184 /*
1185 * Arg:
1186 * video : video bus device
1187 * device : video output device under the video
1188 * bus
1189 *
1190 * Return:
1191 * none
1192 *
1193 * Bind the ids with the corresponding video devices
1194 * under the video bus.
1195 */
1196
1197 static void
1198 acpi_video_device_bind(struct acpi_video_bus *video,
1199 struct acpi_video_device *device)
1200 {
1201 struct acpi_video_enumerated_device *ids;
1202 int i;
1203
1204 for (i = 0; i < video->attached_count; i++) {
1205 ids = &video->attached_array[i];
1206 if (device->device_id == (ids->value.int_val & 0xffff)) {
1207 ids->bind_info = device;
1208 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1209 }
1210 }
1211 }
1212
1213 /*
1214 * Arg:
1215 * video : video bus device
1216 *
1217 * Return:
1218 * < 0 : error
1219 *
1220 * Call _DOD to enumerate all devices attached to display adapter
1221 *
1222 */
1223
1224 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1225 {
1226 int status;
1227 int count;
1228 int i;
1229 struct acpi_video_enumerated_device *active_list;
1230 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1231 union acpi_object *dod = NULL;
1232 union acpi_object *obj;
1233
1234 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1235 if (!ACPI_SUCCESS(status)) {
1236 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1237 return status;
1238 }
1239
1240 dod = buffer.pointer;
1241 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1242 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1243 status = -EFAULT;
1244 goto out;
1245 }
1246
1247 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1248 dod->package.count));
1249
1250 active_list = kcalloc(1 + dod->package.count,
1251 sizeof(struct acpi_video_enumerated_device),
1252 GFP_KERNEL);
1253 if (!active_list) {
1254 status = -ENOMEM;
1255 goto out;
1256 }
1257
1258 count = 0;
1259 for (i = 0; i < dod->package.count; i++) {
1260 obj = &dod->package.elements[i];
1261
1262 if (obj->type != ACPI_TYPE_INTEGER) {
1263 printk(KERN_ERR PREFIX
1264 "Invalid _DOD data in element %d\n", i);
1265 continue;
1266 }
1267
1268 active_list[count].value.int_val = obj->integer.value;
1269 active_list[count].bind_info = NULL;
1270 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1271 (int)obj->integer.value));
1272 count++;
1273 }
1274
1275 kfree(video->attached_array);
1276
1277 video->attached_array = active_list;
1278 video->attached_count = count;
1279
1280 out:
1281 kfree(buffer.pointer);
1282 return status;
1283 }
1284
1285 static int
1286 acpi_video_get_next_level(struct acpi_video_device *device,
1287 u32 level_current, u32 event)
1288 {
1289 int min, max, min_above, max_below, i, l, delta = 255;
1290 max = max_below = 0;
1291 min = min_above = 255;
1292 /* Find closest level to level_current */
1293 for (i = 2; i < device->brightness->count; i++) {
1294 l = device->brightness->levels[i];
1295 if (abs(l - level_current) < abs(delta)) {
1296 delta = l - level_current;
1297 if (!delta)
1298 break;
1299 }
1300 }
1301 /* Ajust level_current to closest available level */
1302 level_current += delta;
1303 for (i = 2; i < device->brightness->count; i++) {
1304 l = device->brightness->levels[i];
1305 if (l < min)
1306 min = l;
1307 if (l > max)
1308 max = l;
1309 if (l < min_above && l > level_current)
1310 min_above = l;
1311 if (l > max_below && l < level_current)
1312 max_below = l;
1313 }
1314
1315 switch (event) {
1316 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1317 return (level_current < max) ? min_above : min;
1318 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1319 return (level_current < max) ? min_above : max;
1320 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1321 return (level_current > min) ? max_below : min;
1322 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1323 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1324 return 0;
1325 default:
1326 return level_current;
1327 }
1328 }
1329
1330 static int
1331 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1332 {
1333 unsigned long long level_current, level_next;
1334 int result = -EINVAL;
1335
1336 /* no warning message if acpi_backlight=vendor is used */
1337 if (!acpi_video_backlight_support())
1338 return 0;
1339
1340 if (!device->brightness)
1341 goto out;
1342
1343 result = acpi_video_device_lcd_get_level_current(device,
1344 &level_current,
1345 false);
1346 if (result)
1347 goto out;
1348
1349 level_next = acpi_video_get_next_level(device, level_current, event);
1350
1351 result = acpi_video_device_lcd_set_level(device, level_next);
1352
1353 if (!result)
1354 backlight_force_update(device->backlight,
1355 BACKLIGHT_UPDATE_HOTKEY);
1356
1357 out:
1358 if (result)
1359 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1360
1361 return result;
1362 }
1363
1364 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1365 void **edid)
1366 {
1367 struct acpi_video_bus *video;
1368 struct acpi_video_device *video_device;
1369 union acpi_object *buffer = NULL;
1370 acpi_status status;
1371 int i, length;
1372
1373 if (!device || !acpi_driver_data(device))
1374 return -EINVAL;
1375
1376 video = acpi_driver_data(device);
1377
1378 for (i = 0; i < video->attached_count; i++) {
1379 video_device = video->attached_array[i].bind_info;
1380 length = 256;
1381
1382 if (!video_device)
1383 continue;
1384
1385 if (!video_device->cap._DDC)
1386 continue;
1387
1388 if (type) {
1389 switch (type) {
1390 case ACPI_VIDEO_DISPLAY_CRT:
1391 if (!video_device->flags.crt)
1392 continue;
1393 break;
1394 case ACPI_VIDEO_DISPLAY_TV:
1395 if (!video_device->flags.tvout)
1396 continue;
1397 break;
1398 case ACPI_VIDEO_DISPLAY_DVI:
1399 if (!video_device->flags.dvi)
1400 continue;
1401 break;
1402 case ACPI_VIDEO_DISPLAY_LCD:
1403 if (!video_device->flags.lcd)
1404 continue;
1405 break;
1406 }
1407 } else if (video_device->device_id != device_id) {
1408 continue;
1409 }
1410
1411 status = acpi_video_device_EDID(video_device, &buffer, length);
1412
1413 if (ACPI_FAILURE(status) || !buffer ||
1414 buffer->type != ACPI_TYPE_BUFFER) {
1415 length = 128;
1416 status = acpi_video_device_EDID(video_device, &buffer,
1417 length);
1418 if (ACPI_FAILURE(status) || !buffer ||
1419 buffer->type != ACPI_TYPE_BUFFER) {
1420 continue;
1421 }
1422 }
1423
1424 *edid = buffer->buffer.pointer;
1425 return length;
1426 }
1427
1428 return -ENODEV;
1429 }
1430 EXPORT_SYMBOL(acpi_video_get_edid);
1431
1432 static int
1433 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1434 struct acpi_device *device)
1435 {
1436 int status = 0;
1437 struct acpi_device *dev;
1438
1439 /*
1440 * There are systems where video module known to work fine regardless
1441 * of broken _DOD and ignoring returned value here doesn't cause
1442 * any issues later.
1443 */
1444 acpi_video_device_enumerate(video);
1445
1446 list_for_each_entry(dev, &device->children, node) {
1447
1448 status = acpi_video_bus_get_one_device(dev, video);
1449 if (status) {
1450 dev_err(&dev->dev, "Can't attach device\n");
1451 break;
1452 }
1453 }
1454 return status;
1455 }
1456
1457 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1458 {
1459 acpi_status status;
1460
1461 if (!device || !device->video)
1462 return -ENOENT;
1463
1464 if (device->flags.notify) {
1465 status = acpi_remove_notify_handler(device->dev->handle,
1466 ACPI_DEVICE_NOTIFY, acpi_video_device_notify);
1467 if (ACPI_FAILURE(status))
1468 dev_err(&device->dev->dev,
1469 "Can't remove video notify handler\n");
1470 }
1471
1472 if (device->backlight) {
1473 backlight_device_unregister(device->backlight);
1474 device->backlight = NULL;
1475 }
1476 if (device->cooling_dev) {
1477 sysfs_remove_link(&device->dev->dev.kobj,
1478 "thermal_cooling");
1479 sysfs_remove_link(&device->cooling_dev->device.kobj,
1480 "device");
1481 thermal_cooling_device_unregister(device->cooling_dev);
1482 device->cooling_dev = NULL;
1483 }
1484
1485 return 0;
1486 }
1487
1488 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1489 {
1490 int status;
1491 struct acpi_video_device *dev, *next;
1492
1493 mutex_lock(&video->device_list_lock);
1494
1495 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1496
1497 status = acpi_video_bus_put_one_device(dev);
1498 if (ACPI_FAILURE(status))
1499 printk(KERN_WARNING PREFIX
1500 "hhuuhhuu bug in acpi video driver.\n");
1501
1502 if (dev->brightness) {
1503 kfree(dev->brightness->levels);
1504 kfree(dev->brightness);
1505 }
1506 list_del(&dev->entry);
1507 kfree(dev);
1508 }
1509
1510 mutex_unlock(&video->device_list_lock);
1511
1512 return 0;
1513 }
1514
1515 /* acpi_video interface */
1516
1517 /*
1518 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1519 * preform any automatic brightness change on receiving a notification.
1520 */
1521 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1522 {
1523 return acpi_video_bus_DOS(video, 0,
1524 acpi_video_backlight_quirks() ? 1 : 0);
1525 }
1526
1527 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1528 {
1529 return acpi_video_bus_DOS(video, 0,
1530 acpi_video_backlight_quirks() ? 0 : 1);
1531 }
1532
1533 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1534 {
1535 struct acpi_video_bus *video = acpi_driver_data(device);
1536 struct input_dev *input;
1537 int keycode = 0;
1538
1539 if (!video)
1540 return;
1541
1542 input = video->input;
1543
1544 switch (event) {
1545 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1546 * most likely via hotkey. */
1547 keycode = KEY_SWITCHVIDEOMODE;
1548 break;
1549
1550 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1551 * connector. */
1552 acpi_video_device_enumerate(video);
1553 acpi_video_device_rebind(video);
1554 keycode = KEY_SWITCHVIDEOMODE;
1555 break;
1556
1557 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1558 keycode = KEY_SWITCHVIDEOMODE;
1559 break;
1560 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1561 keycode = KEY_VIDEO_NEXT;
1562 break;
1563 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1564 keycode = KEY_VIDEO_PREV;
1565 break;
1566
1567 default:
1568 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1569 "Unsupported event [0x%x]\n", event));
1570 break;
1571 }
1572
1573 if (acpi_notifier_call_chain(device, event, 0))
1574 /* Something vetoed the keypress. */
1575 keycode = 0;
1576
1577 if (keycode) {
1578 input_report_key(input, keycode, 1);
1579 input_sync(input);
1580 input_report_key(input, keycode, 0);
1581 input_sync(input);
1582 }
1583
1584 return;
1585 }
1586
1587 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1588 {
1589 struct acpi_video_device *video_device = data;
1590 struct acpi_device *device = NULL;
1591 struct acpi_video_bus *bus;
1592 struct input_dev *input;
1593 int keycode = 0;
1594
1595 if (!video_device)
1596 return;
1597
1598 device = video_device->dev;
1599 bus = video_device->video;
1600 input = bus->input;
1601
1602 switch (event) {
1603 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1604 if (brightness_switch_enabled)
1605 acpi_video_switch_brightness(video_device, event);
1606 keycode = KEY_BRIGHTNESS_CYCLE;
1607 break;
1608 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1609 if (brightness_switch_enabled)
1610 acpi_video_switch_brightness(video_device, event);
1611 keycode = KEY_BRIGHTNESSUP;
1612 break;
1613 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1614 if (brightness_switch_enabled)
1615 acpi_video_switch_brightness(video_device, event);
1616 keycode = KEY_BRIGHTNESSDOWN;
1617 break;
1618 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1619 if (brightness_switch_enabled)
1620 acpi_video_switch_brightness(video_device, event);
1621 keycode = KEY_BRIGHTNESS_ZERO;
1622 break;
1623 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1624 if (brightness_switch_enabled)
1625 acpi_video_switch_brightness(video_device, event);
1626 keycode = KEY_DISPLAY_OFF;
1627 break;
1628 default:
1629 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1630 "Unsupported event [0x%x]\n", event));
1631 break;
1632 }
1633
1634 acpi_notifier_call_chain(device, event, 0);
1635
1636 if (keycode) {
1637 input_report_key(input, keycode, 1);
1638 input_sync(input);
1639 input_report_key(input, keycode, 0);
1640 input_sync(input);
1641 }
1642
1643 return;
1644 }
1645
1646 static int acpi_video_resume(struct notifier_block *nb,
1647 unsigned long val, void *ign)
1648 {
1649 struct acpi_video_bus *video;
1650 struct acpi_video_device *video_device;
1651 int i;
1652
1653 switch (val) {
1654 case PM_HIBERNATION_PREPARE:
1655 case PM_SUSPEND_PREPARE:
1656 case PM_RESTORE_PREPARE:
1657 return NOTIFY_DONE;
1658 }
1659
1660 video = container_of(nb, struct acpi_video_bus, pm_nb);
1661
1662 dev_info(&video->device->dev, "Restoring backlight state\n");
1663
1664 for (i = 0; i < video->attached_count; i++) {
1665 video_device = video->attached_array[i].bind_info;
1666 if (video_device && video_device->backlight)
1667 acpi_video_set_brightness(video_device->backlight);
1668 }
1669
1670 return NOTIFY_OK;
1671 }
1672
1673 static acpi_status
1674 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1675 void **return_value)
1676 {
1677 struct acpi_device *device = context;
1678 struct acpi_device *sibling;
1679 int result;
1680
1681 if (handle == device->handle)
1682 return AE_CTRL_TERMINATE;
1683
1684 result = acpi_bus_get_device(handle, &sibling);
1685 if (result)
1686 return AE_OK;
1687
1688 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1689 return AE_ALREADY_EXISTS;
1690
1691 return AE_OK;
1692 }
1693
1694 static int instance;
1695
1696 static int acpi_video_bus_add(struct acpi_device *device)
1697 {
1698 struct acpi_video_bus *video;
1699 struct input_dev *input;
1700 int error;
1701 acpi_status status;
1702
1703 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1704 device->parent->handle, 1,
1705 acpi_video_bus_match, NULL,
1706 device, NULL);
1707 if (status == AE_ALREADY_EXISTS) {
1708 printk(KERN_WARNING FW_BUG
1709 "Duplicate ACPI video bus devices for the"
1710 " same VGA controller, please try module "
1711 "parameter \"video.allow_duplicates=1\""
1712 "if the current driver doesn't work.\n");
1713 if (!allow_duplicates)
1714 return -ENODEV;
1715 }
1716
1717 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1718 if (!video)
1719 return -ENOMEM;
1720
1721 /* a hack to fix the duplicate name "VID" problem on T61 */
1722 if (!strcmp(device->pnp.bus_id, "VID")) {
1723 if (instance)
1724 device->pnp.bus_id[3] = '0' + instance;
1725 instance++;
1726 }
1727 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1728 if (!strcmp(device->pnp.bus_id, "VGA")) {
1729 if (instance)
1730 device->pnp.bus_id[3] = '0' + instance;
1731 instance++;
1732 }
1733
1734 video->device = device;
1735 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1736 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1737 device->driver_data = video;
1738
1739 acpi_video_bus_find_cap(video);
1740 error = acpi_video_bus_check(video);
1741 if (error)
1742 goto err_free_video;
1743
1744 mutex_init(&video->device_list_lock);
1745 INIT_LIST_HEAD(&video->video_device_list);
1746
1747 error = acpi_video_bus_get_devices(video, device);
1748 if (error)
1749 goto err_put_video;
1750
1751 video->input = input = input_allocate_device();
1752 if (!input) {
1753 error = -ENOMEM;
1754 goto err_put_video;
1755 }
1756
1757 error = acpi_video_bus_start_devices(video);
1758 if (error)
1759 goto err_free_input_dev;
1760
1761 snprintf(video->phys, sizeof(video->phys),
1762 "%s/video/input0", acpi_device_hid(video->device));
1763
1764 input->name = acpi_device_name(video->device);
1765 input->phys = video->phys;
1766 input->id.bustype = BUS_HOST;
1767 input->id.product = 0x06;
1768 input->dev.parent = &device->dev;
1769 input->evbit[0] = BIT(EV_KEY);
1770 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1771 set_bit(KEY_VIDEO_NEXT, input->keybit);
1772 set_bit(KEY_VIDEO_PREV, input->keybit);
1773 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1774 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1775 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1776 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1777 set_bit(KEY_DISPLAY_OFF, input->keybit);
1778
1779 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
1780 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1781 video->flags.multihead ? "yes" : "no",
1782 video->flags.rom ? "yes" : "no",
1783 video->flags.post ? "yes" : "no");
1784
1785 video->pm_nb.notifier_call = acpi_video_resume;
1786 video->pm_nb.priority = 0;
1787 error = register_pm_notifier(&video->pm_nb);
1788 if (error)
1789 goto err_stop_video;
1790
1791 error = input_register_device(input);
1792 if (error)
1793 goto err_unregister_pm_notifier;
1794
1795 return 0;
1796
1797 err_unregister_pm_notifier:
1798 unregister_pm_notifier(&video->pm_nb);
1799 err_stop_video:
1800 acpi_video_bus_stop_devices(video);
1801 err_free_input_dev:
1802 input_free_device(input);
1803 err_put_video:
1804 acpi_video_bus_put_devices(video);
1805 kfree(video->attached_array);
1806 err_free_video:
1807 kfree(video);
1808 device->driver_data = NULL;
1809
1810 return error;
1811 }
1812
1813 static int acpi_video_bus_remove(struct acpi_device *device)
1814 {
1815 struct acpi_video_bus *video = NULL;
1816
1817
1818 if (!device || !acpi_driver_data(device))
1819 return -EINVAL;
1820
1821 video = acpi_driver_data(device);
1822
1823 unregister_pm_notifier(&video->pm_nb);
1824
1825 acpi_video_bus_stop_devices(video);
1826 acpi_video_bus_put_devices(video);
1827
1828 input_unregister_device(video->input);
1829 kfree(video->attached_array);
1830 kfree(video);
1831
1832 return 0;
1833 }
1834
1835 static int __init is_i740(struct pci_dev *dev)
1836 {
1837 if (dev->device == 0x00D1)
1838 return 1;
1839 if (dev->device == 0x7000)
1840 return 1;
1841 return 0;
1842 }
1843
1844 static int __init intel_opregion_present(void)
1845 {
1846 int opregion = 0;
1847 struct pci_dev *dev = NULL;
1848 u32 address;
1849
1850 for_each_pci_dev(dev) {
1851 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1852 continue;
1853 if (dev->vendor != PCI_VENDOR_ID_INTEL)
1854 continue;
1855 /* We don't want to poke around undefined i740 registers */
1856 if (is_i740(dev))
1857 continue;
1858 pci_read_config_dword(dev, 0xfc, &address);
1859 if (!address)
1860 continue;
1861 opregion = 1;
1862 }
1863 return opregion;
1864 }
1865
1866 int acpi_video_register(void)
1867 {
1868 int result = 0;
1869 if (register_count) {
1870 /*
1871 * if the function of acpi_video_register is already called,
1872 * don't register the acpi_vide_bus again and return no error.
1873 */
1874 return 0;
1875 }
1876
1877 result = acpi_bus_register_driver(&acpi_video_bus);
1878 if (result < 0)
1879 return -ENODEV;
1880
1881 /*
1882 * When the acpi_video_bus is loaded successfully, increase
1883 * the counter reference.
1884 */
1885 register_count = 1;
1886
1887 return 0;
1888 }
1889 EXPORT_SYMBOL(acpi_video_register);
1890
1891 void acpi_video_unregister(void)
1892 {
1893 if (!register_count) {
1894 /*
1895 * If the acpi video bus is already unloaded, don't
1896 * unload it again and return directly.
1897 */
1898 return;
1899 }
1900 acpi_bus_unregister_driver(&acpi_video_bus);
1901
1902 register_count = 0;
1903
1904 return;
1905 }
1906 EXPORT_SYMBOL(acpi_video_unregister);
1907
1908 /*
1909 * This is kind of nasty. Hardware using Intel chipsets may require
1910 * the video opregion code to be run first in order to initialise
1911 * state before any ACPI video calls are made. To handle this we defer
1912 * registration of the video class until the opregion code has run.
1913 */
1914
1915 static int __init acpi_video_init(void)
1916 {
1917 dmi_check_system(video_dmi_table);
1918
1919 if (intel_opregion_present())
1920 return 0;
1921
1922 return acpi_video_register();
1923 }
1924
1925 static void __exit acpi_video_exit(void)
1926 {
1927 acpi_video_unregister();
1928
1929 return;
1930 }
1931
1932 module_init(acpi_video_init);
1933 module_exit(acpi_video_exit);
Linux kernel - Deliverables
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