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Merge git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-3.0-fixes
[deliverable/linux.git] / drivers / acpi / video.c
1 /*
2 * video.c - ACPI Video Driver ($Revision:$)
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 = 0;
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 _BCL_use_index:1; /* levels in _BCL are index values */
189 u8 _BCM_use_index:1; /* input of _BCM is an index value */
190 u8 _BQC_use_index:1; /* _BQC returns an index value */
191 };
192
193 struct acpi_video_device_brightness {
194 int curr;
195 int count;
196 int *levels;
197 struct acpi_video_brightness_flags flags;
198 };
199
200 struct acpi_video_device {
201 unsigned long device_id;
202 struct acpi_video_device_flags flags;
203 struct acpi_video_device_cap cap;
204 struct list_head entry;
205 struct acpi_video_bus *video;
206 struct acpi_device *dev;
207 struct acpi_video_device_brightness *brightness;
208 struct backlight_device *backlight;
209 struct thermal_cooling_device *cooling_dev;
210 };
211
212 static const char device_decode[][30] = {
213 "motherboard VGA device",
214 "PCI VGA device",
215 "AGP VGA device",
216 "UNKNOWN",
217 };
218
219 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
220 static void acpi_video_device_rebind(struct acpi_video_bus *video);
221 static void acpi_video_device_bind(struct acpi_video_bus *video,
222 struct acpi_video_device *device);
223 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
224 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
225 int level);
226 static int acpi_video_device_lcd_get_level_current(
227 struct acpi_video_device *device,
228 unsigned long long *level, bool raw);
229 static int acpi_video_get_next_level(struct acpi_video_device *device,
230 u32 level_current, u32 event);
231 static int acpi_video_switch_brightness(struct acpi_video_device *device,
232 int event);
233
234 /*backlight device sysfs support*/
235 static int acpi_video_get_brightness(struct backlight_device *bd)
236 {
237 unsigned long long cur_level;
238 int i;
239 struct acpi_video_device *vd =
240 (struct acpi_video_device *)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 /* The first two entries are special - see page 575
247 of the ACPI spec 3.0 */
248 return i-2;
249 }
250 return 0;
251 }
252
253 static int acpi_video_set_brightness(struct backlight_device *bd)
254 {
255 int request_level = bd->props.brightness + 2;
256 struct acpi_video_device *vd =
257 (struct acpi_video_device *)bl_get_data(bd);
258
259 return acpi_video_device_lcd_set_level(vd,
260 vd->brightness->levels[request_level]);
261 }
262
263 static const struct backlight_ops acpi_backlight_ops = {
264 .get_brightness = acpi_video_get_brightness,
265 .update_status = acpi_video_set_brightness,
266 };
267
268 /* thermal cooling device callbacks */
269 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
270 long *state)
271 {
272 struct acpi_device *device = cooling_dev->devdata;
273 struct acpi_video_device *video = acpi_driver_data(device);
274
275 *state = video->brightness->count - 3;
276 return 0;
277 }
278
279 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
280 long *state)
281 {
282 struct acpi_device *device = cooling_dev->devdata;
283 struct acpi_video_device *video = acpi_driver_data(device);
284 unsigned long long level;
285 int offset;
286
287 if (acpi_video_device_lcd_get_level_current(video, &level, false))
288 return -EINVAL;
289 for (offset = 2; offset < video->brightness->count; offset++)
290 if (level == video->brightness->levels[offset]) {
291 *state = video->brightness->count - offset - 1;
292 return 0;
293 }
294
295 return -EINVAL;
296 }
297
298 static int
299 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
300 {
301 struct acpi_device *device = cooling_dev->devdata;
302 struct acpi_video_device *video = acpi_driver_data(device);
303 int level;
304
305 if ( state >= video->brightness->count - 2)
306 return -EINVAL;
307
308 state = video->brightness->count - state;
309 level = video->brightness->levels[state -1];
310 return acpi_video_device_lcd_set_level(video, level);
311 }
312
313 static const struct thermal_cooling_device_ops video_cooling_ops = {
314 .get_max_state = video_get_max_state,
315 .get_cur_state = video_get_cur_state,
316 .set_cur_state = video_set_cur_state,
317 };
318
319 /* --------------------------------------------------------------------------
320 Video Management
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 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
359 struct acpi_object_list args = { 1, &arg0 };
360 int state;
361
362 arg0.integer.value = level;
363
364 status = acpi_evaluate_object(device->dev->handle, "_BCM",
365 &args, NULL);
366 if (ACPI_FAILURE(status)) {
367 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
368 return -EIO;
369 }
370
371 device->brightness->curr = level;
372 for (state = 2; state < device->brightness->count; state++)
373 if (level == device->brightness->levels[state]) {
374 if (device->backlight)
375 device->backlight->props.brightness = state - 2;
376 return 0;
377 }
378
379 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
380 return -EINVAL;
381 }
382
383 /*
384 * For some buggy _BQC methods, we need to add a constant value to
385 * the _BQC return value to get the actual current brightness level
386 */
387
388 static int bqc_offset_aml_bug_workaround;
389 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
390 {
391 bqc_offset_aml_bug_workaround = 9;
392 return 0;
393 }
394
395 static int video_ignore_initial_backlight(const struct dmi_system_id *d)
396 {
397 use_bios_initial_backlight = 0;
398 return 0;
399 }
400
401 static struct dmi_system_id video_dmi_table[] __initdata = {
402 /*
403 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
404 */
405 {
406 .callback = video_set_bqc_offset,
407 .ident = "Acer Aspire 5720",
408 .matches = {
409 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
410 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
411 },
412 },
413 {
414 .callback = video_set_bqc_offset,
415 .ident = "Acer Aspire 5710Z",
416 .matches = {
417 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
418 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
419 },
420 },
421 {
422 .callback = video_set_bqc_offset,
423 .ident = "eMachines E510",
424 .matches = {
425 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
426 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
427 },
428 },
429 {
430 .callback = video_set_bqc_offset,
431 .ident = "Acer Aspire 5315",
432 .matches = {
433 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
434 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
435 },
436 },
437 {
438 .callback = video_set_bqc_offset,
439 .ident = "Acer Aspire 7720",
440 .matches = {
441 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
442 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
443 },
444 },
445 {
446 .callback = video_ignore_initial_backlight,
447 .ident = "HP Folio 13-2000",
448 .matches = {
449 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
450 DMI_MATCH(DMI_PRODUCT_NAME, "HP Folio 13 - 2000 Notebook PC"),
451 },
452 },
453 {
454 .callback = video_ignore_initial_backlight,
455 .ident = "Fujitsu E753",
456 .matches = {
457 DMI_MATCH(DMI_BOARD_VENDOR, "FUJITSU"),
458 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E753"),
459 },
460 },
461 {
462 .callback = video_ignore_initial_backlight,
463 .ident = "HP Pavilion dm4",
464 .matches = {
465 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
466 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion dm4 Notebook PC"),
467 },
468 },
469 {
470 .callback = video_ignore_initial_backlight,
471 .ident = "HP Pavilion g6 Notebook PC",
472 .matches = {
473 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
474 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion g6 Notebook PC"),
475 },
476 },
477 {
478 .callback = video_ignore_initial_backlight,
479 .ident = "HP 1000 Notebook PC",
480 .matches = {
481 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
482 DMI_MATCH(DMI_PRODUCT_NAME, "HP 1000 Notebook PC"),
483 },
484 },
485 {
486 .callback = video_ignore_initial_backlight,
487 .ident = "HP Pavilion m4",
488 .matches = {
489 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
490 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion m4 Notebook PC"),
491 },
492 },
493 {}
494 };
495
496 static unsigned long long
497 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
498 unsigned long long bqc_value)
499 {
500 unsigned long long level;
501
502 if (device->brightness->flags._BQC_use_index) {
503 /*
504 * _BQC returns an index that doesn't account for
505 * the first 2 items with special meaning, so we need
506 * to compensate for that by offsetting ourselves
507 */
508 if (device->brightness->flags._BCL_reversed)
509 bqc_value = device->brightness->count - 3 - bqc_value;
510
511 level = device->brightness->levels[bqc_value + 2];
512 } else {
513 level = bqc_value;
514 }
515
516 level += bqc_offset_aml_bug_workaround;
517
518 return level;
519 }
520
521 static int
522 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
523 unsigned long long *level, bool raw)
524 {
525 acpi_status status = AE_OK;
526 int i;
527
528 if (device->cap._BQC || device->cap._BCQ) {
529 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
530
531 status = acpi_evaluate_integer(device->dev->handle, buf,
532 NULL, level);
533 if (ACPI_SUCCESS(status)) {
534 if (raw) {
535 /*
536 * Caller has indicated he wants the raw
537 * value returned by _BQC, so don't furtherly
538 * mess with the value.
539 */
540 return 0;
541 }
542
543 *level = acpi_video_bqc_value_to_level(device, *level);
544
545 for (i = 2; i < device->brightness->count; i++)
546 if (device->brightness->levels[i] == *level) {
547 device->brightness->curr = *level;
548 return 0;
549 }
550 /*
551 * BQC returned an invalid level.
552 * Stop using it.
553 */
554 ACPI_WARNING((AE_INFO,
555 "%s returned an invalid level",
556 buf));
557 device->cap._BQC = device->cap._BCQ = 0;
558 } else {
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 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
642 struct acpi_object_list args = { 1, &arg0 };
643
644 if (!video->cap._DOS)
645 return 0;
646
647 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
648 return -EINVAL;
649 arg0.integer.value = (lcd_flag << 2) | bios_flag;
650 video->dos_setting = arg0.integer.value;
651 status = acpi_evaluate_object(video->device->handle, "_DOS",
652 &args, NULL);
653 if (ACPI_FAILURE(status))
654 return -EIO;
655
656 return 0;
657 }
658
659 /*
660 * Simple comparison function used to sort backlight levels.
661 */
662
663 static int
664 acpi_video_cmp_level(const void *a, const void *b)
665 {
666 return *(int *)a - *(int *)b;
667 }
668
669 /*
670 * Decides if _BQC/_BCQ for this system is usable
671 *
672 * We do this by changing the level first and then read out the current
673 * brightness level, if the value does not match, find out if it is using
674 * index. If not, clear the _BQC/_BCQ capability.
675 */
676 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
677 int max_level, int current_level)
678 {
679 struct acpi_video_device_brightness *br = device->brightness;
680 int result;
681 unsigned long long level;
682 int test_level;
683
684 /* don't mess with existing known broken systems */
685 if (bqc_offset_aml_bug_workaround)
686 return 0;
687
688 /*
689 * Some systems always report current brightness level as maximum
690 * through _BQC, we need to test another value for them.
691 */
692 test_level = current_level == max_level ? br->levels[3] : max_level;
693
694 result = acpi_video_device_lcd_set_level(device, test_level);
695 if (result)
696 return result;
697
698 result = acpi_video_device_lcd_get_level_current(device, &level, true);
699 if (result)
700 return result;
701
702 if (level != test_level) {
703 /* buggy _BQC found, need to find out if it uses index */
704 if (level < br->count) {
705 if (br->flags._BCL_reversed)
706 level = br->count - 3 - level;
707 if (br->levels[level + 2] == test_level)
708 br->flags._BQC_use_index = 1;
709 }
710
711 if (!br->flags._BQC_use_index)
712 device->cap._BQC = device->cap._BCQ = 0;
713 }
714
715 return 0;
716 }
717
718
719 /*
720 * Arg:
721 * device : video output device (LCD, CRT, ..)
722 *
723 * Return Value:
724 * Maximum brightness level
725 *
726 * Allocate and initialize device->brightness.
727 */
728
729 static int
730 acpi_video_init_brightness(struct acpi_video_device *device)
731 {
732 union acpi_object *obj = NULL;
733 int i, max_level = 0, count = 0, level_ac_battery = 0;
734 unsigned long long level, level_old;
735 union acpi_object *o;
736 struct acpi_video_device_brightness *br = NULL;
737 int result = -EINVAL;
738
739 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
740 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
741 "LCD brightness level\n"));
742 goto out;
743 }
744
745 if (obj->package.count < 2)
746 goto out;
747
748 br = kzalloc(sizeof(*br), GFP_KERNEL);
749 if (!br) {
750 printk(KERN_ERR "can't allocate memory\n");
751 result = -ENOMEM;
752 goto out;
753 }
754
755 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
756 GFP_KERNEL);
757 if (!br->levels) {
758 result = -ENOMEM;
759 goto out_free;
760 }
761
762 for (i = 0; i < obj->package.count; i++) {
763 o = (union acpi_object *)&obj->package.elements[i];
764 if (o->type != ACPI_TYPE_INTEGER) {
765 printk(KERN_ERR PREFIX "Invalid data\n");
766 continue;
767 }
768 br->levels[count] = (u32) o->integer.value;
769
770 if (br->levels[count] > max_level)
771 max_level = br->levels[count];
772 count++;
773 }
774
775 /*
776 * some buggy BIOS don't export the levels
777 * when machine is on AC/Battery in _BCL package.
778 * In this case, the first two elements in _BCL packages
779 * are also supported brightness levels that OS should take care of.
780 */
781 for (i = 2; i < count; i++) {
782 if (br->levels[i] == br->levels[0])
783 level_ac_battery++;
784 if (br->levels[i] == br->levels[1])
785 level_ac_battery++;
786 }
787
788 if (level_ac_battery < 2) {
789 level_ac_battery = 2 - level_ac_battery;
790 br->flags._BCL_no_ac_battery_levels = 1;
791 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
792 br->levels[i] = br->levels[i - level_ac_battery];
793 count += level_ac_battery;
794 } else if (level_ac_battery > 2)
795 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
796
797 /* Check if the _BCL package is in a reversed order */
798 if (max_level == br->levels[2]) {
799 br->flags._BCL_reversed = 1;
800 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
801 acpi_video_cmp_level, NULL);
802 } else if (max_level != br->levels[count - 1])
803 ACPI_ERROR((AE_INFO,
804 "Found unordered _BCL package"));
805
806 br->count = count;
807 device->brightness = br;
808
809 /* Check the input/output of _BQC/_BCL/_BCM */
810 if ((max_level < 100) && (max_level <= (count - 2)))
811 br->flags._BCL_use_index = 1;
812
813 /*
814 * _BCM is always consistent with _BCL,
815 * at least for all the laptops we have ever seen.
816 */
817 br->flags._BCM_use_index = br->flags._BCL_use_index;
818
819 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
820 br->curr = level = max_level;
821
822 if (!device->cap._BQC)
823 goto set_level;
824
825 result = acpi_video_device_lcd_get_level_current(device,
826 &level_old, true);
827 if (result)
828 goto out_free_levels;
829
830 result = acpi_video_bqc_quirk(device, max_level, level_old);
831 if (result)
832 goto out_free_levels;
833 /*
834 * cap._BQC may get cleared due to _BQC is found to be broken
835 * in acpi_video_bqc_quirk, so check again here.
836 */
837 if (!device->cap._BQC)
838 goto set_level;
839
840 if (use_bios_initial_backlight) {
841 level = acpi_video_bqc_value_to_level(device, level_old);
842 /*
843 * On some buggy laptops, _BQC returns an uninitialized
844 * value when invoked for the first time, i.e.
845 * level_old is invalid (no matter whether it's a level
846 * or an index). Set the backlight to max_level in this case.
847 */
848 for (i = 2; i < br->count; i++)
849 if (level_old == br->levels[i])
850 break;
851 if (i == br->count)
852 level = max_level;
853 }
854
855 set_level:
856 result = acpi_video_device_lcd_set_level(device, level);
857 if (result)
858 goto out_free_levels;
859
860 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
861 "found %d brightness levels\n", count - 2));
862 kfree(obj);
863 return result;
864
865 out_free_levels:
866 kfree(br->levels);
867 out_free:
868 kfree(br);
869 out:
870 device->brightness = NULL;
871 kfree(obj);
872 return result;
873 }
874
875 /*
876 * Arg:
877 * device : video output device (LCD, CRT, ..)
878 *
879 * Return Value:
880 * None
881 *
882 * Find out all required AML methods defined under the output
883 * device.
884 */
885
886 static void acpi_video_device_find_cap(struct acpi_video_device *device)
887 {
888 acpi_handle h_dummy1;
889
890 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
891 device->cap._ADR = 1;
892 }
893 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
894 device->cap._BCL = 1;
895 }
896 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
897 device->cap._BCM = 1;
898 }
899 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
900 device->cap._BQC = 1;
901 else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
902 &h_dummy1))) {
903 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
904 device->cap._BCQ = 1;
905 }
906
907 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
908 device->cap._DDC = 1;
909 }
910
911 if (acpi_video_init_brightness(device))
912 return;
913
914 if (acpi_video_backlight_support()) {
915 struct backlight_properties props;
916 struct pci_dev *pdev;
917 acpi_handle acpi_parent;
918 struct device *parent = NULL;
919 int result;
920 static int count = 0;
921 char *name;
922
923 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
924 if (!name)
925 return;
926 count++;
927
928 acpi_get_parent(device->dev->handle, &acpi_parent);
929
930 pdev = acpi_get_pci_dev(acpi_parent);
931 if (pdev) {
932 parent = &pdev->dev;
933 pci_dev_put(pdev);
934 }
935
936 memset(&props, 0, sizeof(struct backlight_properties));
937 props.type = BACKLIGHT_FIRMWARE;
938 props.max_brightness = device->brightness->count - 3;
939 device->backlight = backlight_device_register(name,
940 parent,
941 device,
942 &acpi_backlight_ops,
943 &props);
944 kfree(name);
945 if (IS_ERR(device->backlight))
946 return;
947
948 /*
949 * Save current brightness level in case we have to restore it
950 * before acpi_video_device_lcd_set_level() is called next time.
951 */
952 device->backlight->props.brightness =
953 acpi_video_get_brightness(device->backlight);
954
955 device->cooling_dev = thermal_cooling_device_register("LCD",
956 device->dev, &video_cooling_ops);
957 if (IS_ERR(device->cooling_dev)) {
958 /*
959 * Set cooling_dev to NULL so we don't crash trying to
960 * free it.
961 * Also, why the hell we are returning early and
962 * not attempt to register video output if cooling
963 * device registration failed?
964 * -- dtor
965 */
966 device->cooling_dev = NULL;
967 return;
968 }
969
970 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
971 device->cooling_dev->id);
972 result = sysfs_create_link(&device->dev->dev.kobj,
973 &device->cooling_dev->device.kobj,
974 "thermal_cooling");
975 if (result)
976 printk(KERN_ERR PREFIX "Create sysfs link\n");
977 result = sysfs_create_link(&device->cooling_dev->device.kobj,
978 &device->dev->dev.kobj, "device");
979 if (result)
980 printk(KERN_ERR PREFIX "Create sysfs link\n");
981
982 } else {
983 /* Remove the brightness object. */
984 kfree(device->brightness->levels);
985 kfree(device->brightness);
986 device->brightness = NULL;
987 }
988 }
989
990 /*
991 * Arg:
992 * device : video output device (VGA)
993 *
994 * Return Value:
995 * None
996 *
997 * Find out all required AML methods defined under the video bus device.
998 */
999
1000 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1001 {
1002 acpi_handle h_dummy1;
1003
1004 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
1005 video->cap._DOS = 1;
1006 }
1007 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
1008 video->cap._DOD = 1;
1009 }
1010 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
1011 video->cap._ROM = 1;
1012 }
1013 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
1014 video->cap._GPD = 1;
1015 }
1016 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
1017 video->cap._SPD = 1;
1018 }
1019 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
1020 video->cap._VPO = 1;
1021 }
1022 }
1023
1024 /*
1025 * Check whether the video bus device has required AML method to
1026 * support the desired features
1027 */
1028
1029 static int acpi_video_bus_check(struct acpi_video_bus *video)
1030 {
1031 acpi_status status = -ENOENT;
1032 struct pci_dev *dev;
1033
1034 if (!video)
1035 return -EINVAL;
1036
1037 dev = acpi_get_pci_dev(video->device->handle);
1038 if (!dev)
1039 return -ENODEV;
1040 pci_dev_put(dev);
1041
1042 /* Since there is no HID, CID and so on for VGA driver, we have
1043 * to check well known required nodes.
1044 */
1045
1046 /* Does this device support video switching? */
1047 if (video->cap._DOS || video->cap._DOD) {
1048 if (!video->cap._DOS) {
1049 printk(KERN_WARNING FW_BUG
1050 "ACPI(%s) defines _DOD but not _DOS\n",
1051 acpi_device_bid(video->device));
1052 }
1053 video->flags.multihead = 1;
1054 status = 0;
1055 }
1056
1057 /* Does this device support retrieving a video ROM? */
1058 if (video->cap._ROM) {
1059 video->flags.rom = 1;
1060 status = 0;
1061 }
1062
1063 /* Does this device support configuring which video device to POST? */
1064 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1065 video->flags.post = 1;
1066 status = 0;
1067 }
1068
1069 return status;
1070 }
1071
1072 /* --------------------------------------------------------------------------
1073 Driver Interface
1074 -------------------------------------------------------------------------- */
1075
1076 /* device interface */
1077 static struct acpi_video_device_attrib*
1078 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1079 {
1080 struct acpi_video_enumerated_device *ids;
1081 int i;
1082
1083 for (i = 0; i < video->attached_count; i++) {
1084 ids = &video->attached_array[i];
1085 if ((ids->value.int_val & 0xffff) == device_id)
1086 return &ids->value.attrib;
1087 }
1088
1089 return NULL;
1090 }
1091
1092 static int
1093 acpi_video_get_device_type(struct acpi_video_bus *video,
1094 unsigned long device_id)
1095 {
1096 struct acpi_video_enumerated_device *ids;
1097 int i;
1098
1099 for (i = 0; i < video->attached_count; i++) {
1100 ids = &video->attached_array[i];
1101 if ((ids->value.int_val & 0xffff) == device_id)
1102 return ids->value.int_val;
1103 }
1104
1105 return 0;
1106 }
1107
1108 static int
1109 acpi_video_bus_get_one_device(struct acpi_device *device,
1110 struct acpi_video_bus *video)
1111 {
1112 unsigned long long device_id;
1113 int status, device_type;
1114 struct acpi_video_device *data;
1115 struct acpi_video_device_attrib* attribute;
1116
1117 status =
1118 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1119 /* Some device omits _ADR, we skip them instead of fail */
1120 if (ACPI_FAILURE(status))
1121 return 0;
1122
1123 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1124 if (!data)
1125 return -ENOMEM;
1126
1127 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1128 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1129 device->driver_data = data;
1130
1131 data->device_id = device_id;
1132 data->video = video;
1133 data->dev = device;
1134
1135 attribute = acpi_video_get_device_attr(video, device_id);
1136
1137 if((attribute != NULL) && attribute->device_id_scheme) {
1138 switch (attribute->display_type) {
1139 case ACPI_VIDEO_DISPLAY_CRT:
1140 data->flags.crt = 1;
1141 break;
1142 case ACPI_VIDEO_DISPLAY_TV:
1143 data->flags.tvout = 1;
1144 break;
1145 case ACPI_VIDEO_DISPLAY_DVI:
1146 data->flags.dvi = 1;
1147 break;
1148 case ACPI_VIDEO_DISPLAY_LCD:
1149 data->flags.lcd = 1;
1150 break;
1151 default:
1152 data->flags.unknown = 1;
1153 break;
1154 }
1155 if(attribute->bios_can_detect)
1156 data->flags.bios = 1;
1157 } else {
1158 /* Check for legacy IDs */
1159 device_type = acpi_video_get_device_type(video, device_id);
1160 /* Ignore bits 16 and 18-20 */
1161 switch (device_type & 0xffe2ffff) {
1162 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1163 data->flags.crt = 1;
1164 break;
1165 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1166 data->flags.lcd = 1;
1167 break;
1168 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1169 data->flags.tvout = 1;
1170 break;
1171 default:
1172 data->flags.unknown = 1;
1173 }
1174 }
1175
1176 acpi_video_device_bind(video, data);
1177 acpi_video_device_find_cap(data);
1178
1179 status = acpi_install_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
1180 acpi_video_device_notify, data);
1181 if (ACPI_FAILURE(status))
1182 dev_err(&device->dev, "Error installing notify handler\n");
1183 else
1184 data->flags.notify = 1;
1185
1186 mutex_lock(&video->device_list_lock);
1187 list_add_tail(&data->entry, &video->video_device_list);
1188 mutex_unlock(&video->device_list_lock);
1189
1190 return status;
1191 }
1192
1193 /*
1194 * Arg:
1195 * video : video bus device
1196 *
1197 * Return:
1198 * none
1199 *
1200 * Enumerate the video device list of the video bus,
1201 * bind the ids with the corresponding video devices
1202 * under the video bus.
1203 */
1204
1205 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1206 {
1207 struct acpi_video_device *dev;
1208
1209 mutex_lock(&video->device_list_lock);
1210
1211 list_for_each_entry(dev, &video->video_device_list, entry)
1212 acpi_video_device_bind(video, dev);
1213
1214 mutex_unlock(&video->device_list_lock);
1215 }
1216
1217 /*
1218 * Arg:
1219 * video : video bus device
1220 * device : video output device under the video
1221 * bus
1222 *
1223 * Return:
1224 * none
1225 *
1226 * Bind the ids with the corresponding video devices
1227 * under the video bus.
1228 */
1229
1230 static void
1231 acpi_video_device_bind(struct acpi_video_bus *video,
1232 struct acpi_video_device *device)
1233 {
1234 struct acpi_video_enumerated_device *ids;
1235 int i;
1236
1237 for (i = 0; i < video->attached_count; i++) {
1238 ids = &video->attached_array[i];
1239 if (device->device_id == (ids->value.int_val & 0xffff)) {
1240 ids->bind_info = device;
1241 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1242 }
1243 }
1244 }
1245
1246 /*
1247 * Arg:
1248 * video : video bus device
1249 *
1250 * Return:
1251 * < 0 : error
1252 *
1253 * Call _DOD to enumerate all devices attached to display adapter
1254 *
1255 */
1256
1257 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1258 {
1259 int status;
1260 int count;
1261 int i;
1262 struct acpi_video_enumerated_device *active_list;
1263 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1264 union acpi_object *dod = NULL;
1265 union acpi_object *obj;
1266
1267 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1268 if (!ACPI_SUCCESS(status)) {
1269 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1270 return status;
1271 }
1272
1273 dod = buffer.pointer;
1274 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1275 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1276 status = -EFAULT;
1277 goto out;
1278 }
1279
1280 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1281 dod->package.count));
1282
1283 active_list = kcalloc(1 + dod->package.count,
1284 sizeof(struct acpi_video_enumerated_device),
1285 GFP_KERNEL);
1286 if (!active_list) {
1287 status = -ENOMEM;
1288 goto out;
1289 }
1290
1291 count = 0;
1292 for (i = 0; i < dod->package.count; i++) {
1293 obj = &dod->package.elements[i];
1294
1295 if (obj->type != ACPI_TYPE_INTEGER) {
1296 printk(KERN_ERR PREFIX
1297 "Invalid _DOD data in element %d\n", i);
1298 continue;
1299 }
1300
1301 active_list[count].value.int_val = obj->integer.value;
1302 active_list[count].bind_info = NULL;
1303 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1304 (int)obj->integer.value));
1305 count++;
1306 }
1307
1308 kfree(video->attached_array);
1309
1310 video->attached_array = active_list;
1311 video->attached_count = count;
1312
1313 out:
1314 kfree(buffer.pointer);
1315 return status;
1316 }
1317
1318 static int
1319 acpi_video_get_next_level(struct acpi_video_device *device,
1320 u32 level_current, u32 event)
1321 {
1322 int min, max, min_above, max_below, i, l, delta = 255;
1323 max = max_below = 0;
1324 min = min_above = 255;
1325 /* Find closest level to level_current */
1326 for (i = 2; i < device->brightness->count; i++) {
1327 l = device->brightness->levels[i];
1328 if (abs(l - level_current) < abs(delta)) {
1329 delta = l - level_current;
1330 if (!delta)
1331 break;
1332 }
1333 }
1334 /* Ajust level_current to closest available level */
1335 level_current += delta;
1336 for (i = 2; i < device->brightness->count; i++) {
1337 l = device->brightness->levels[i];
1338 if (l < min)
1339 min = l;
1340 if (l > max)
1341 max = l;
1342 if (l < min_above && l > level_current)
1343 min_above = l;
1344 if (l > max_below && l < level_current)
1345 max_below = l;
1346 }
1347
1348 switch (event) {
1349 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1350 return (level_current < max) ? min_above : min;
1351 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1352 return (level_current < max) ? min_above : max;
1353 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1354 return (level_current > min) ? max_below : min;
1355 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1356 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1357 return 0;
1358 default:
1359 return level_current;
1360 }
1361 }
1362
1363 static int
1364 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1365 {
1366 unsigned long long level_current, level_next;
1367 int result = -EINVAL;
1368
1369 /* no warning message if acpi_backlight=vendor is used */
1370 if (!acpi_video_backlight_support())
1371 return 0;
1372
1373 if (!device->brightness)
1374 goto out;
1375
1376 result = acpi_video_device_lcd_get_level_current(device,
1377 &level_current,
1378 false);
1379 if (result)
1380 goto out;
1381
1382 level_next = acpi_video_get_next_level(device, level_current, event);
1383
1384 result = acpi_video_device_lcd_set_level(device, level_next);
1385
1386 if (!result)
1387 backlight_force_update(device->backlight,
1388 BACKLIGHT_UPDATE_HOTKEY);
1389
1390 out:
1391 if (result)
1392 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1393
1394 return result;
1395 }
1396
1397 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1398 void **edid)
1399 {
1400 struct acpi_video_bus *video;
1401 struct acpi_video_device *video_device;
1402 union acpi_object *buffer = NULL;
1403 acpi_status status;
1404 int i, length;
1405
1406 if (!device || !acpi_driver_data(device))
1407 return -EINVAL;
1408
1409 video = acpi_driver_data(device);
1410
1411 for (i = 0; i < video->attached_count; i++) {
1412 video_device = video->attached_array[i].bind_info;
1413 length = 256;
1414
1415 if (!video_device)
1416 continue;
1417
1418 if (!video_device->cap._DDC)
1419 continue;
1420
1421 if (type) {
1422 switch (type) {
1423 case ACPI_VIDEO_DISPLAY_CRT:
1424 if (!video_device->flags.crt)
1425 continue;
1426 break;
1427 case ACPI_VIDEO_DISPLAY_TV:
1428 if (!video_device->flags.tvout)
1429 continue;
1430 break;
1431 case ACPI_VIDEO_DISPLAY_DVI:
1432 if (!video_device->flags.dvi)
1433 continue;
1434 break;
1435 case ACPI_VIDEO_DISPLAY_LCD:
1436 if (!video_device->flags.lcd)
1437 continue;
1438 break;
1439 }
1440 } else if (video_device->device_id != device_id) {
1441 continue;
1442 }
1443
1444 status = acpi_video_device_EDID(video_device, &buffer, length);
1445
1446 if (ACPI_FAILURE(status) || !buffer ||
1447 buffer->type != ACPI_TYPE_BUFFER) {
1448 length = 128;
1449 status = acpi_video_device_EDID(video_device, &buffer,
1450 length);
1451 if (ACPI_FAILURE(status) || !buffer ||
1452 buffer->type != ACPI_TYPE_BUFFER) {
1453 continue;
1454 }
1455 }
1456
1457 *edid = buffer->buffer.pointer;
1458 return length;
1459 }
1460
1461 return -ENODEV;
1462 }
1463 EXPORT_SYMBOL(acpi_video_get_edid);
1464
1465 static int
1466 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1467 struct acpi_device *device)
1468 {
1469 int status = 0;
1470 struct acpi_device *dev;
1471
1472 /*
1473 * There are systems where video module known to work fine regardless
1474 * of broken _DOD and ignoring returned value here doesn't cause
1475 * any issues later.
1476 */
1477 acpi_video_device_enumerate(video);
1478
1479 list_for_each_entry(dev, &device->children, node) {
1480
1481 status = acpi_video_bus_get_one_device(dev, video);
1482 if (status) {
1483 dev_err(&dev->dev, "Can't attach device\n");
1484 break;
1485 }
1486 }
1487 return status;
1488 }
1489
1490 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1491 {
1492 acpi_status status;
1493
1494 if (!device || !device->video)
1495 return -ENOENT;
1496
1497 if (device->flags.notify) {
1498 status = acpi_remove_notify_handler(device->dev->handle,
1499 ACPI_DEVICE_NOTIFY, acpi_video_device_notify);
1500 if (ACPI_FAILURE(status))
1501 dev_err(&device->dev->dev,
1502 "Can't remove video notify handler\n");
1503 }
1504
1505 if (device->backlight) {
1506 backlight_device_unregister(device->backlight);
1507 device->backlight = NULL;
1508 }
1509 if (device->cooling_dev) {
1510 sysfs_remove_link(&device->dev->dev.kobj,
1511 "thermal_cooling");
1512 sysfs_remove_link(&device->cooling_dev->device.kobj,
1513 "device");
1514 thermal_cooling_device_unregister(device->cooling_dev);
1515 device->cooling_dev = NULL;
1516 }
1517
1518 return 0;
1519 }
1520
1521 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1522 {
1523 int status;
1524 struct acpi_video_device *dev, *next;
1525
1526 mutex_lock(&video->device_list_lock);
1527
1528 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1529
1530 status = acpi_video_bus_put_one_device(dev);
1531 if (ACPI_FAILURE(status))
1532 printk(KERN_WARNING PREFIX
1533 "hhuuhhuu bug in acpi video driver.\n");
1534
1535 if (dev->brightness) {
1536 kfree(dev->brightness->levels);
1537 kfree(dev->brightness);
1538 }
1539 list_del(&dev->entry);
1540 kfree(dev);
1541 }
1542
1543 mutex_unlock(&video->device_list_lock);
1544
1545 return 0;
1546 }
1547
1548 /* acpi_video interface */
1549
1550 /*
1551 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1552 * preform any automatic brightness change on receiving a notification.
1553 */
1554 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1555 {
1556 return acpi_video_bus_DOS(video, 0,
1557 acpi_video_backlight_quirks() ? 1 : 0);
1558 }
1559
1560 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1561 {
1562 return acpi_video_bus_DOS(video, 0,
1563 acpi_video_backlight_quirks() ? 0 : 1);
1564 }
1565
1566 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1567 {
1568 struct acpi_video_bus *video = acpi_driver_data(device);
1569 struct input_dev *input;
1570 int keycode = 0;
1571
1572 if (!video)
1573 return;
1574
1575 input = video->input;
1576
1577 switch (event) {
1578 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1579 * most likely via hotkey. */
1580 acpi_bus_generate_proc_event(device, event, 0);
1581 keycode = KEY_SWITCHVIDEOMODE;
1582 break;
1583
1584 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1585 * connector. */
1586 acpi_video_device_enumerate(video);
1587 acpi_video_device_rebind(video);
1588 acpi_bus_generate_proc_event(device, event, 0);
1589 keycode = KEY_SWITCHVIDEOMODE;
1590 break;
1591
1592 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1593 acpi_bus_generate_proc_event(device, event, 0);
1594 keycode = KEY_SWITCHVIDEOMODE;
1595 break;
1596 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1597 acpi_bus_generate_proc_event(device, event, 0);
1598 keycode = KEY_VIDEO_NEXT;
1599 break;
1600 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1601 acpi_bus_generate_proc_event(device, event, 0);
1602 keycode = KEY_VIDEO_PREV;
1603 break;
1604
1605 default:
1606 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1607 "Unsupported event [0x%x]\n", event));
1608 break;
1609 }
1610
1611 if (acpi_notifier_call_chain(device, event, 0))
1612 /* Something vetoed the keypress. */
1613 keycode = 0;
1614
1615 if (keycode) {
1616 input_report_key(input, keycode, 1);
1617 input_sync(input);
1618 input_report_key(input, keycode, 0);
1619 input_sync(input);
1620 }
1621
1622 return;
1623 }
1624
1625 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1626 {
1627 struct acpi_video_device *video_device = data;
1628 struct acpi_device *device = NULL;
1629 struct acpi_video_bus *bus;
1630 struct input_dev *input;
1631 int keycode = 0;
1632
1633 if (!video_device)
1634 return;
1635
1636 device = video_device->dev;
1637 bus = video_device->video;
1638 input = bus->input;
1639
1640 switch (event) {
1641 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1642 if (brightness_switch_enabled)
1643 acpi_video_switch_brightness(video_device, event);
1644 acpi_bus_generate_proc_event(device, event, 0);
1645 keycode = KEY_BRIGHTNESS_CYCLE;
1646 break;
1647 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1648 if (brightness_switch_enabled)
1649 acpi_video_switch_brightness(video_device, event);
1650 acpi_bus_generate_proc_event(device, event, 0);
1651 keycode = KEY_BRIGHTNESSUP;
1652 break;
1653 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1654 if (brightness_switch_enabled)
1655 acpi_video_switch_brightness(video_device, event);
1656 acpi_bus_generate_proc_event(device, event, 0);
1657 keycode = KEY_BRIGHTNESSDOWN;
1658 break;
1659 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1660 if (brightness_switch_enabled)
1661 acpi_video_switch_brightness(video_device, event);
1662 acpi_bus_generate_proc_event(device, event, 0);
1663 keycode = KEY_BRIGHTNESS_ZERO;
1664 break;
1665 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1666 if (brightness_switch_enabled)
1667 acpi_video_switch_brightness(video_device, event);
1668 acpi_bus_generate_proc_event(device, event, 0);
1669 keycode = KEY_DISPLAY_OFF;
1670 break;
1671 default:
1672 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1673 "Unsupported event [0x%x]\n", event));
1674 break;
1675 }
1676
1677 acpi_notifier_call_chain(device, event, 0);
1678
1679 if (keycode) {
1680 input_report_key(input, keycode, 1);
1681 input_sync(input);
1682 input_report_key(input, keycode, 0);
1683 input_sync(input);
1684 }
1685
1686 return;
1687 }
1688
1689 static int acpi_video_resume(struct notifier_block *nb,
1690 unsigned long val, void *ign)
1691 {
1692 struct acpi_video_bus *video;
1693 struct acpi_video_device *video_device;
1694 int i;
1695
1696 switch (val) {
1697 case PM_HIBERNATION_PREPARE:
1698 case PM_SUSPEND_PREPARE:
1699 case PM_RESTORE_PREPARE:
1700 return NOTIFY_DONE;
1701 }
1702
1703 video = container_of(nb, struct acpi_video_bus, pm_nb);
1704
1705 dev_info(&video->device->dev, "Restoring backlight state\n");
1706
1707 for (i = 0; i < video->attached_count; i++) {
1708 video_device = video->attached_array[i].bind_info;
1709 if (video_device && video_device->backlight)
1710 acpi_video_set_brightness(video_device->backlight);
1711 }
1712
1713 return NOTIFY_OK;
1714 }
1715
1716 static acpi_status
1717 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1718 void **return_value)
1719 {
1720 struct acpi_device *device = context;
1721 struct acpi_device *sibling;
1722 int result;
1723
1724 if (handle == device->handle)
1725 return AE_CTRL_TERMINATE;
1726
1727 result = acpi_bus_get_device(handle, &sibling);
1728 if (result)
1729 return AE_OK;
1730
1731 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1732 return AE_ALREADY_EXISTS;
1733
1734 return AE_OK;
1735 }
1736
1737 static int instance;
1738
1739 static int acpi_video_bus_add(struct acpi_device *device)
1740 {
1741 struct acpi_video_bus *video;
1742 struct input_dev *input;
1743 int error;
1744 acpi_status status;
1745
1746 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1747 device->parent->handle, 1,
1748 acpi_video_bus_match, NULL,
1749 device, NULL);
1750 if (status == AE_ALREADY_EXISTS) {
1751 printk(KERN_WARNING FW_BUG
1752 "Duplicate ACPI video bus devices for the"
1753 " same VGA controller, please try module "
1754 "parameter \"video.allow_duplicates=1\""
1755 "if the current driver doesn't work.\n");
1756 if (!allow_duplicates)
1757 return -ENODEV;
1758 }
1759
1760 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1761 if (!video)
1762 return -ENOMEM;
1763
1764 /* a hack to fix the duplicate name "VID" problem on T61 */
1765 if (!strcmp(device->pnp.bus_id, "VID")) {
1766 if (instance)
1767 device->pnp.bus_id[3] = '0' + instance;
1768 instance ++;
1769 }
1770 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1771 if (!strcmp(device->pnp.bus_id, "VGA")) {
1772 if (instance)
1773 device->pnp.bus_id[3] = '0' + instance;
1774 instance++;
1775 }
1776
1777 video->device = device;
1778 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1779 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1780 device->driver_data = video;
1781
1782 acpi_video_bus_find_cap(video);
1783 error = acpi_video_bus_check(video);
1784 if (error)
1785 goto err_free_video;
1786
1787 mutex_init(&video->device_list_lock);
1788 INIT_LIST_HEAD(&video->video_device_list);
1789
1790 error = acpi_video_bus_get_devices(video, device);
1791 if (error)
1792 goto err_put_video;
1793
1794 video->input = input = input_allocate_device();
1795 if (!input) {
1796 error = -ENOMEM;
1797 goto err_put_video;
1798 }
1799
1800 error = acpi_video_bus_start_devices(video);
1801 if (error)
1802 goto err_free_input_dev;
1803
1804 snprintf(video->phys, sizeof(video->phys),
1805 "%s/video/input0", acpi_device_hid(video->device));
1806
1807 input->name = acpi_device_name(video->device);
1808 input->phys = video->phys;
1809 input->id.bustype = BUS_HOST;
1810 input->id.product = 0x06;
1811 input->dev.parent = &device->dev;
1812 input->evbit[0] = BIT(EV_KEY);
1813 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1814 set_bit(KEY_VIDEO_NEXT, input->keybit);
1815 set_bit(KEY_VIDEO_PREV, input->keybit);
1816 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1817 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1818 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1819 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1820 set_bit(KEY_DISPLAY_OFF, input->keybit);
1821
1822 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
1823 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1824 video->flags.multihead ? "yes" : "no",
1825 video->flags.rom ? "yes" : "no",
1826 video->flags.post ? "yes" : "no");
1827
1828 video->pm_nb.notifier_call = acpi_video_resume;
1829 video->pm_nb.priority = 0;
1830 error = register_pm_notifier(&video->pm_nb);
1831 if (error)
1832 goto err_stop_video;
1833
1834 error = input_register_device(input);
1835 if (error)
1836 goto err_unregister_pm_notifier;
1837
1838 return 0;
1839
1840 err_unregister_pm_notifier:
1841 unregister_pm_notifier(&video->pm_nb);
1842 err_stop_video:
1843 acpi_video_bus_stop_devices(video);
1844 err_free_input_dev:
1845 input_free_device(input);
1846 err_put_video:
1847 acpi_video_bus_put_devices(video);
1848 kfree(video->attached_array);
1849 err_free_video:
1850 kfree(video);
1851 device->driver_data = NULL;
1852
1853 return error;
1854 }
1855
1856 static int acpi_video_bus_remove(struct acpi_device *device)
1857 {
1858 struct acpi_video_bus *video = NULL;
1859
1860
1861 if (!device || !acpi_driver_data(device))
1862 return -EINVAL;
1863
1864 video = acpi_driver_data(device);
1865
1866 unregister_pm_notifier(&video->pm_nb);
1867
1868 acpi_video_bus_stop_devices(video);
1869 acpi_video_bus_put_devices(video);
1870
1871 input_unregister_device(video->input);
1872 kfree(video->attached_array);
1873 kfree(video);
1874
1875 return 0;
1876 }
1877
1878 static int __init is_i740(struct pci_dev *dev)
1879 {
1880 if (dev->device == 0x00D1)
1881 return 1;
1882 if (dev->device == 0x7000)
1883 return 1;
1884 return 0;
1885 }
1886
1887 static int __init intel_opregion_present(void)
1888 {
1889 int opregion = 0;
1890 struct pci_dev *dev = NULL;
1891 u32 address;
1892
1893 for_each_pci_dev(dev) {
1894 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1895 continue;
1896 if (dev->vendor != PCI_VENDOR_ID_INTEL)
1897 continue;
1898 /* We don't want to poke around undefined i740 registers */
1899 if (is_i740(dev))
1900 continue;
1901 pci_read_config_dword(dev, 0xfc, &address);
1902 if (!address)
1903 continue;
1904 opregion = 1;
1905 }
1906 return opregion;
1907 }
1908
1909 int acpi_video_register(void)
1910 {
1911 int result = 0;
1912 if (register_count) {
1913 /*
1914 * if the function of acpi_video_register is already called,
1915 * don't register the acpi_vide_bus again and return no error.
1916 */
1917 return 0;
1918 }
1919
1920 result = acpi_bus_register_driver(&acpi_video_bus);
1921 if (result < 0)
1922 return -ENODEV;
1923
1924 /*
1925 * When the acpi_video_bus is loaded successfully, increase
1926 * the counter reference.
1927 */
1928 register_count = 1;
1929
1930 return 0;
1931 }
1932 EXPORT_SYMBOL(acpi_video_register);
1933
1934 void acpi_video_unregister(void)
1935 {
1936 if (!register_count) {
1937 /*
1938 * If the acpi video bus is already unloaded, don't
1939 * unload it again and return directly.
1940 */
1941 return;
1942 }
1943 acpi_bus_unregister_driver(&acpi_video_bus);
1944
1945 register_count = 0;
1946
1947 return;
1948 }
1949 EXPORT_SYMBOL(acpi_video_unregister);
1950
1951 /*
1952 * This is kind of nasty. Hardware using Intel chipsets may require
1953 * the video opregion code to be run first in order to initialise
1954 * state before any ACPI video calls are made. To handle this we defer
1955 * registration of the video class until the opregion code has run.
1956 */
1957
1958 static int __init acpi_video_init(void)
1959 {
1960 dmi_check_system(video_dmi_table);
1961
1962 if (intel_opregion_present())
1963 return 0;
1964
1965 return acpi_video_register();
1966 }
1967
1968 static void __exit acpi_video_exit(void)
1969 {
1970 acpi_video_unregister();
1971
1972 return;
1973 }
1974
1975 module_init(acpi_video_init);
1976 module_exit(acpi_video_exit);
Linux kernel - Deliverables
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