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s390/ptrace: get rid of long longs in psw_bits
[linux/fpc-iii.git] / drivers / acpi / acpi_video.c
blob3405f7a41e2576415d344eb0782323ba469ea0a4
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 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
21 */
22
23 #include <linux/kernel.h>
24 #include <linux/module.h>
25 #include <linux/init.h>
26 #include <linux/types.h>
27 #include <linux/list.h>
28 #include <linux/mutex.h>
29 #include <linux/input.h>
30 #include <linux/backlight.h>
31 #include <linux/thermal.h>
32 #include <linux/sort.h>
33 #include <linux/pci.h>
34 #include <linux/pci_ids.h>
35 #include <linux/slab.h>
36 #include <linux/dmi.h>
37 #include <linux/suspend.h>
38 #include <linux/acpi.h>
39 #include <acpi/video.h>
40 #include <asm/uaccess.h>
41
42 #define PREFIX "ACPI: "
43
44 #define ACPI_VIDEO_BUS_NAME "Video Bus"
45 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
46 #define ACPI_VIDEO_NOTIFY_SWITCH 0x80
47 #define ACPI_VIDEO_NOTIFY_PROBE 0x81
48 #define ACPI_VIDEO_NOTIFY_CYCLE 0x82
49 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
50 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
51
52 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
53 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
54 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
55 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
56 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
57
58 #define MAX_NAME_LEN 20
59
60 #define _COMPONENT ACPI_VIDEO_COMPONENT
61 ACPI_MODULE_NAME("video");
62
63 MODULE_AUTHOR("Bruno Ducrot");
64 MODULE_DESCRIPTION("ACPI Video Driver");
65 MODULE_LICENSE("GPL");
66
67 static bool brightness_switch_enabled = 1;
68 module_param(brightness_switch_enabled, bool, 0644);
69
70 /*
71 * By default, we don't allow duplicate ACPI video bus devices
72 * under the same VGA controller
73 */
74 static bool allow_duplicates;
75 module_param(allow_duplicates, bool, 0644);
76
77 static int disable_backlight_sysfs_if = -1;
78 module_param(disable_backlight_sysfs_if, int, 0444);
79
80 static bool device_id_scheme = false;
81 module_param(device_id_scheme, bool, 0444);
82
83 static bool only_lcd = false;
84 module_param(only_lcd, bool, 0444);
85
86 static int register_count;
87 static DEFINE_MUTEX(register_count_mutex);
88 static struct mutex video_list_lock;
89 static struct list_head video_bus_head;
90 static int acpi_video_bus_add(struct acpi_device *device);
91 static int acpi_video_bus_remove(struct acpi_device *device);
92 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
93 void acpi_video_detect_exit(void);
94
95 static const struct acpi_device_id video_device_ids[] = {
96 {ACPI_VIDEO_HID, 0},
97 {"", 0},
98 };
99 MODULE_DEVICE_TABLE(acpi, video_device_ids);
100
101 static struct acpi_driver acpi_video_bus = {
102 .name = "video",
103 .class = ACPI_VIDEO_CLASS,
104 .ids = video_device_ids,
105 .ops = {
106 .add = acpi_video_bus_add,
107 .remove = acpi_video_bus_remove,
108 .notify = acpi_video_bus_notify,
109 },
110 };
111
112 struct acpi_video_bus_flags {
113 u8 multihead:1; /* can switch video heads */
114 u8 rom:1; /* can retrieve a video rom */
115 u8 post:1; /* can configure the head to */
116 u8 reserved:5;
117 };
118
119 struct acpi_video_bus_cap {
120 u8 _DOS:1; /* Enable/Disable output switching */
121 u8 _DOD:1; /* Enumerate all devices attached to display adapter */
122 u8 _ROM:1; /* Get ROM Data */
123 u8 _GPD:1; /* Get POST Device */
124 u8 _SPD:1; /* Set POST Device */
125 u8 _VPO:1; /* Video POST Options */
126 u8 reserved:2;
127 };
128
129 struct acpi_video_device_attrib {
130 u32 display_index:4; /* A zero-based instance of the Display */
131 u32 display_port_attachment:4; /* This field differentiates the display type */
132 u32 display_type:4; /* Describe the specific type in use */
133 u32 vendor_specific:4; /* Chipset Vendor Specific */
134 u32 bios_can_detect:1; /* BIOS can detect the device */
135 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to
136 the VGA device. */
137 u32 pipe_id:3; /* For VGA multiple-head devices. */
138 u32 reserved:10; /* Must be 0 */
139 u32 device_id_scheme:1; /* Device ID Scheme */
140 };
141
142 struct acpi_video_enumerated_device {
143 union {
144 u32 int_val;
145 struct acpi_video_device_attrib attrib;
146 } value;
147 struct acpi_video_device *bind_info;
148 };
149
150 struct acpi_video_bus {
151 struct acpi_device *device;
152 bool backlight_registered;
153 u8 dos_setting;
154 struct acpi_video_enumerated_device *attached_array;
155 u8 attached_count;
156 u8 child_count;
157 struct acpi_video_bus_cap cap;
158 struct acpi_video_bus_flags flags;
159 struct list_head video_device_list;
160 struct mutex device_list_lock; /* protects video_device_list */
161 struct list_head entry;
162 struct input_dev *input;
163 char phys[32]; /* for input device */
164 struct notifier_block pm_nb;
165 };
166
167 struct acpi_video_device_flags {
168 u8 crt:1;
169 u8 lcd:1;
170 u8 tvout:1;
171 u8 dvi:1;
172 u8 bios:1;
173 u8 unknown:1;
174 u8 notify:1;
175 u8 reserved:1;
176 };
177
178 struct acpi_video_device_cap {
179 u8 _ADR:1; /* Return the unique ID */
180 u8 _BCL:1; /* Query list of brightness control levels supported */
181 u8 _BCM:1; /* Set the brightness level */
182 u8 _BQC:1; /* Get current brightness level */
183 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
184 u8 _DDC:1; /* Return the EDID for this device */
185 };
186
187 struct acpi_video_brightness_flags {
188 u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
189 u8 _BCL_reversed:1; /* _BCL package is in a reversed order */
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 delayed_work switch_brightness_work;
206 int switch_brightness_event;
207 struct acpi_video_bus *video;
208 struct acpi_device *dev;
209 struct acpi_video_device_brightness *brightness;
210 struct backlight_device *backlight;
211 struct thermal_cooling_device *cooling_dev;
212 };
213
214 static const char device_decode[][30] = {
215 "motherboard VGA device",
216 "PCI VGA device",
217 "AGP VGA device",
218 "UNKNOWN",
219 };
220
221 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
222 static void acpi_video_device_rebind(struct acpi_video_bus *video);
223 static void acpi_video_device_bind(struct acpi_video_bus *video,
224 struct acpi_video_device *device);
225 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
226 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
227 int level);
228 static int acpi_video_device_lcd_get_level_current(
229 struct acpi_video_device *device,
230 unsigned long long *level, bool raw);
231 static int acpi_video_get_next_level(struct acpi_video_device *device,
232 u32 level_current, u32 event);
233 static void acpi_video_switch_brightness(struct work_struct *work);
234
235 /* backlight device sysfs support */
236 static int acpi_video_get_brightness(struct backlight_device *bd)
237 {
238 unsigned long long cur_level;
239 int i;
240 struct acpi_video_device *vd = bl_get_data(bd);
241
242 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
243 return -EINVAL;
244 for (i = 2; i < vd->brightness->count; i++) {
245 if (vd->brightness->levels[i] == cur_level)
246 /*
247 * The first two entries are special - see page 575
248 * of the ACPI spec 3.0
249 */
250 return i - 2;
251 }
252 return 0;
253 }
254
255 static int acpi_video_set_brightness(struct backlight_device *bd)
256 {
257 int request_level = bd->props.brightness + 2;
258 struct acpi_video_device *vd = bl_get_data(bd);
259
260 cancel_delayed_work(&vd->switch_brightness_work);
261 return acpi_video_device_lcd_set_level(vd,
262 vd->brightness->levels[request_level]);
263 }
264
265 static const struct backlight_ops acpi_backlight_ops = {
266 .get_brightness = acpi_video_get_brightness,
267 .update_status = acpi_video_set_brightness,
268 };
269
270 /* thermal cooling device callbacks */
271 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
272 long *state)
273 {
274 struct acpi_device *device = cooling_dev->devdata;
275 struct acpi_video_device *video = acpi_driver_data(device);
276
277 *state = video->brightness->count - 3;
278 return 0;
279 }
280
281 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
282 long *state)
283 {
284 struct acpi_device *device = cooling_dev->devdata;
285 struct acpi_video_device *video = acpi_driver_data(device);
286 unsigned long long level;
287 int offset;
288
289 if (acpi_video_device_lcd_get_level_current(video, &level, false))
290 return -EINVAL;
291 for (offset = 2; offset < video->brightness->count; offset++)
292 if (level == video->brightness->levels[offset]) {
293 *state = video->brightness->count - offset - 1;
294 return 0;
295 }
296
297 return -EINVAL;
298 }
299
300 static int
301 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
302 {
303 struct acpi_device *device = cooling_dev->devdata;
304 struct acpi_video_device *video = acpi_driver_data(device);
305 int level;
306
307 if (state >= video->brightness->count - 2)
308 return -EINVAL;
309
310 state = video->brightness->count - state;
311 level = video->brightness->levels[state - 1];
312 return acpi_video_device_lcd_set_level(video, level);
313 }
314
315 static const struct thermal_cooling_device_ops video_cooling_ops = {
316 .get_max_state = video_get_max_state,
317 .get_cur_state = video_get_cur_state,
318 .set_cur_state = video_set_cur_state,
319 };
320
321 /*
322 * --------------------------------------------------------------------------
323 * Video Management
324 * --------------------------------------------------------------------------
325 */
326
327 static int
328 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
329 union acpi_object **levels)
330 {
331 int status;
332 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
333 union acpi_object *obj;
334
335
336 *levels = NULL;
337
338 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
339 if (!ACPI_SUCCESS(status))
340 return status;
341 obj = (union acpi_object *)buffer.pointer;
342 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
343 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
344 status = -EFAULT;
345 goto err;
346 }
347
348 *levels = obj;
349
350 return 0;
351
352 err:
353 kfree(buffer.pointer);
354
355 return status;
356 }
357
358 static int
359 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
360 {
361 int status;
362 int state;
363
364 status = acpi_execute_simple_method(device->dev->handle,
365 "_BCM", level);
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 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_disable_backlight_sysfs_if(
396 const struct dmi_system_id *d)
397 {
398 if (disable_backlight_sysfs_if == -1)
399 disable_backlight_sysfs_if = 1;
400 return 0;
401 }
402
403 static int video_set_device_id_scheme(const struct dmi_system_id *d)
404 {
405 device_id_scheme = true;
406 return 0;
407 }
408
409 static int video_enable_only_lcd(const struct dmi_system_id *d)
410 {
411 only_lcd = true;
412 return 0;
413 }
414
415 static struct dmi_system_id video_dmi_table[] = {
416 /*
417 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
418 */
419 {
420 .callback = video_set_bqc_offset,
421 .ident = "Acer Aspire 5720",
422 .matches = {
423 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
424 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
425 },
426 },
427 {
428 .callback = video_set_bqc_offset,
429 .ident = "Acer Aspire 5710Z",
430 .matches = {
431 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
432 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
433 },
434 },
435 {
436 .callback = video_set_bqc_offset,
437 .ident = "eMachines E510",
438 .matches = {
439 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
440 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
441 },
442 },
443 {
444 .callback = video_set_bqc_offset,
445 .ident = "Acer Aspire 5315",
446 .matches = {
447 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
448 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
449 },
450 },
451 {
452 .callback = video_set_bqc_offset,
453 .ident = "Acer Aspire 7720",
454 .matches = {
455 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
456 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
457 },
458 },
459
460 /*
461 * Some machines have a broken acpi-video interface for brightness
462 * control, but still need an acpi_video_device_lcd_set_level() call
463 * on resume to turn the backlight power on. We Enable backlight
464 * control on these systems, but do not register a backlight sysfs
465 * as brightness control does not work.
466 */
467 {
468 /* https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
469 .callback = video_disable_backlight_sysfs_if,
470 .ident = "Toshiba Portege R830",
471 .matches = {
472 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
473 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R830"),
474 },
475 },
476 /*
477 * Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set
478 * but the IDs actually follow the Device ID Scheme.
479 */
480 {
481 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
482 .callback = video_set_device_id_scheme,
483 .ident = "ESPRIMO Mobile M9410",
484 .matches = {
485 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
486 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
487 },
488 },
489 /*
490 * Some machines have multiple video output devices, but only the one
491 * that is the type of LCD can do the backlight control so we should not
492 * register backlight interface for other video output devices.
493 */
494 {
495 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
496 .callback = video_enable_only_lcd,
497 .ident = "ESPRIMO Mobile M9410",
498 .matches = {
499 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
500 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
501 },
502 },
503 {}
504 };
505
506 static unsigned long long
507 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
508 unsigned long long bqc_value)
509 {
510 unsigned long long level;
511
512 if (device->brightness->flags._BQC_use_index) {
513 /*
514 * _BQC returns an index that doesn't account for
515 * the first 2 items with special meaning, so we need
516 * to compensate for that by offsetting ourselves
517 */
518 if (device->brightness->flags._BCL_reversed)
519 bqc_value = device->brightness->count - 3 - bqc_value;
520
521 level = device->brightness->levels[bqc_value + 2];
522 } else {
523 level = bqc_value;
524 }
525
526 level += bqc_offset_aml_bug_workaround;
527
528 return level;
529 }
530
531 static int
532 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
533 unsigned long long *level, bool raw)
534 {
535 acpi_status status = AE_OK;
536 int i;
537
538 if (device->cap._BQC || device->cap._BCQ) {
539 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
540
541 status = acpi_evaluate_integer(device->dev->handle, buf,
542 NULL, level);
543 if (ACPI_SUCCESS(status)) {
544 if (raw) {
545 /*
546 * Caller has indicated he wants the raw
547 * value returned by _BQC, so don't furtherly
548 * mess with the value.
549 */
550 return 0;
551 }
552
553 *level = acpi_video_bqc_value_to_level(device, *level);
554
555 for (i = 2; i < device->brightness->count; i++)
556 if (device->brightness->levels[i] == *level) {
557 device->brightness->curr = *level;
558 return 0;
559 }
560 /*
561 * BQC returned an invalid level.
562 * Stop using it.
563 */
564 ACPI_WARNING((AE_INFO,
565 "%s returned an invalid level",
566 buf));
567 device->cap._BQC = device->cap._BCQ = 0;
568 } else {
569 /*
570 * Fixme:
571 * should we return an error or ignore this failure?
572 * dev->brightness->curr is a cached value which stores
573 * the correct current backlight level in most cases.
574 * ACPI video backlight still works w/ buggy _BQC.
575 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
576 */
577 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
578 device->cap._BQC = device->cap._BCQ = 0;
579 }
580 }
581
582 *level = device->brightness->curr;
583 return 0;
584 }
585
586 static int
587 acpi_video_device_EDID(struct acpi_video_device *device,
588 union acpi_object **edid, ssize_t length)
589 {
590 int status;
591 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
592 union acpi_object *obj;
593 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
594 struct acpi_object_list args = { 1, &arg0 };
595
596
597 *edid = NULL;
598
599 if (!device)
600 return -ENODEV;
601 if (length == 128)
602 arg0.integer.value = 1;
603 else if (length == 256)
604 arg0.integer.value = 2;
605 else
606 return -EINVAL;
607
608 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
609 if (ACPI_FAILURE(status))
610 return -ENODEV;
611
612 obj = buffer.pointer;
613
614 if (obj && obj->type == ACPI_TYPE_BUFFER)
615 *edid = obj;
616 else {
617 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
618 status = -EFAULT;
619 kfree(obj);
620 }
621
622 return status;
623 }
624
625 /* bus */
626
627 /*
628 * Arg:
629 * video : video bus device pointer
630 * bios_flag :
631 * 0. The system BIOS should NOT automatically switch(toggle)
632 * the active display output.
633 * 1. The system BIOS should automatically switch (toggle) the
634 * active display output. No switch event.
635 * 2. The _DGS value should be locked.
636 * 3. The system BIOS should not automatically switch (toggle) the
637 * active display output, but instead generate the display switch
638 * event notify code.
639 * lcd_flag :
640 * 0. The system BIOS should automatically control the brightness level
641 * of the LCD when the power changes from AC to DC
642 * 1. The system BIOS should NOT automatically control the brightness
643 * level of the LCD when the power changes from AC to DC.
644 * Return Value:
645 * -EINVAL wrong arg.
646 */
647
648 static int
649 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
650 {
651 acpi_status status;
652
653 if (!video->cap._DOS)
654 return 0;
655
656 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
657 return -EINVAL;
658 video->dos_setting = (lcd_flag << 2) | bios_flag;
659 status = acpi_execute_simple_method(video->device->handle, "_DOS",
660 (lcd_flag << 2) | bios_flag);
661 if (ACPI_FAILURE(status))
662 return -EIO;
663
664 return 0;
665 }
666
667 /*
668 * Simple comparison function used to sort backlight levels.
669 */
670
671 static int
672 acpi_video_cmp_level(const void *a, const void *b)
673 {
674 return *(int *)a - *(int *)b;
675 }
676
677 /*
678 * Decides if _BQC/_BCQ for this system is usable
679 *
680 * We do this by changing the level first and then read out the current
681 * brightness level, if the value does not match, find out if it is using
682 * index. If not, clear the _BQC/_BCQ capability.
683 */
684 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
685 int max_level, int current_level)
686 {
687 struct acpi_video_device_brightness *br = device->brightness;
688 int result;
689 unsigned long long level;
690 int test_level;
691
692 /* don't mess with existing known broken systems */
693 if (bqc_offset_aml_bug_workaround)
694 return 0;
695
696 /*
697 * Some systems always report current brightness level as maximum
698 * through _BQC, we need to test another value for them.
699 */
700 test_level = current_level == max_level ? br->levels[3] : max_level;
701
702 result = acpi_video_device_lcd_set_level(device, test_level);
703 if (result)
704 return result;
705
706 result = acpi_video_device_lcd_get_level_current(device, &level, true);
707 if (result)
708 return result;
709
710 if (level != test_level) {
711 /* buggy _BQC found, need to find out if it uses index */
712 if (level < br->count) {
713 if (br->flags._BCL_reversed)
714 level = br->count - 3 - level;
715 if (br->levels[level + 2] == test_level)
716 br->flags._BQC_use_index = 1;
717 }
718
719 if (!br->flags._BQC_use_index)
720 device->cap._BQC = device->cap._BCQ = 0;
721 }
722
723 return 0;
724 }
725
726
727 /*
728 * Arg:
729 * device : video output device (LCD, CRT, ..)
730 *
731 * Return Value:
732 * Maximum brightness level
733 *
734 * Allocate and initialize device->brightness.
735 */
736
737 static int
738 acpi_video_init_brightness(struct acpi_video_device *device)
739 {
740 union acpi_object *obj = NULL;
741 int i, max_level = 0, count = 0, level_ac_battery = 0;
742 unsigned long long level, level_old;
743 union acpi_object *o;
744 struct acpi_video_device_brightness *br = NULL;
745 int result = -EINVAL;
746 u32 value;
747
748 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
749 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
750 "LCD brightness level\n"));
751 goto out;
752 }
753
754 if (obj->package.count < 2)
755 goto out;
756
757 br = kzalloc(sizeof(*br), GFP_KERNEL);
758 if (!br) {
759 printk(KERN_ERR "can't allocate memory\n");
760 result = -ENOMEM;
761 goto out;
762 }
763
764 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
765 GFP_KERNEL);
766 if (!br->levels) {
767 result = -ENOMEM;
768 goto out_free;
769 }
770
771 for (i = 0; i < obj->package.count; i++) {
772 o = (union acpi_object *)&obj->package.elements[i];
773 if (o->type != ACPI_TYPE_INTEGER) {
774 printk(KERN_ERR PREFIX "Invalid data\n");
775 continue;
776 }
777 value = (u32) o->integer.value;
778 /* Skip duplicate entries */
779 if (count > 2 && br->levels[count - 1] == value)
780 continue;
781
782 br->levels[count] = value;
783
784 if (br->levels[count] > max_level)
785 max_level = br->levels[count];
786 count++;
787 }
788
789 /*
790 * some buggy BIOS don't export the levels
791 * when machine is on AC/Battery in _BCL package.
792 * In this case, the first two elements in _BCL packages
793 * are also supported brightness levels that OS should take care of.
794 */
795 for (i = 2; i < count; i++) {
796 if (br->levels[i] == br->levels[0])
797 level_ac_battery++;
798 if (br->levels[i] == br->levels[1])
799 level_ac_battery++;
800 }
801
802 if (level_ac_battery < 2) {
803 level_ac_battery = 2 - level_ac_battery;
804 br->flags._BCL_no_ac_battery_levels = 1;
805 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
806 br->levels[i] = br->levels[i - level_ac_battery];
807 count += level_ac_battery;
808 } else if (level_ac_battery > 2)
809 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
810
811 /* Check if the _BCL package is in a reversed order */
812 if (max_level == br->levels[2]) {
813 br->flags._BCL_reversed = 1;
814 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
815 acpi_video_cmp_level, NULL);
816 } else if (max_level != br->levels[count - 1])
817 ACPI_ERROR((AE_INFO,
818 "Found unordered _BCL package"));
819
820 br->count = count;
821 device->brightness = br;
822
823 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
824 br->curr = level = max_level;
825
826 if (!device->cap._BQC)
827 goto set_level;
828
829 result = acpi_video_device_lcd_get_level_current(device,
830 &level_old, true);
831 if (result)
832 goto out_free_levels;
833
834 result = acpi_video_bqc_quirk(device, max_level, level_old);
835 if (result)
836 goto out_free_levels;
837 /*
838 * cap._BQC may get cleared due to _BQC is found to be broken
839 * in acpi_video_bqc_quirk, so check again here.
840 */
841 if (!device->cap._BQC)
842 goto set_level;
843
844 level = acpi_video_bqc_value_to_level(device, level_old);
845 /*
846 * On some buggy laptops, _BQC returns an uninitialized
847 * value when invoked for the first time, i.e.
848 * level_old is invalid (no matter whether it's a level
849 * or an index). Set the backlight to max_level in this case.
850 */
851 for (i = 2; i < br->count; i++)
852 if (level == br->levels[i])
853 break;
854 if (i == br->count || !level)
855 level = max_level;
856
857 set_level:
858 result = acpi_video_device_lcd_set_level(device, level);
859 if (result)
860 goto out_free_levels;
861
862 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
863 "found %d brightness levels\n", count - 2));
864 kfree(obj);
865 return result;
866
867 out_free_levels:
868 kfree(br->levels);
869 out_free:
870 kfree(br);
871 out:
872 device->brightness = NULL;
873 kfree(obj);
874 return result;
875 }
876
877 /*
878 * Arg:
879 * device : video output device (LCD, CRT, ..)
880 *
881 * Return Value:
882 * None
883 *
884 * Find out all required AML methods defined under the output
885 * device.
886 */
887
888 static void acpi_video_device_find_cap(struct acpi_video_device *device)
889 {
890 if (acpi_has_method(device->dev->handle, "_ADR"))
891 device->cap._ADR = 1;
892 if (acpi_has_method(device->dev->handle, "_BCL"))
893 device->cap._BCL = 1;
894 if (acpi_has_method(device->dev->handle, "_BCM"))
895 device->cap._BCM = 1;
896 if (acpi_has_method(device->dev->handle, "_BQC")) {
897 device->cap._BQC = 1;
898 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
899 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
900 device->cap._BCQ = 1;
901 }
902
903 if (acpi_has_method(device->dev->handle, "_DDC"))
904 device->cap._DDC = 1;
905 }
906
907 /*
908 * Arg:
909 * device : video output device (VGA)
910 *
911 * Return Value:
912 * None
913 *
914 * Find out all required AML methods defined under the video bus device.
915 */
916
917 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
918 {
919 if (acpi_has_method(video->device->handle, "_DOS"))
920 video->cap._DOS = 1;
921 if (acpi_has_method(video->device->handle, "_DOD"))
922 video->cap._DOD = 1;
923 if (acpi_has_method(video->device->handle, "_ROM"))
924 video->cap._ROM = 1;
925 if (acpi_has_method(video->device->handle, "_GPD"))
926 video->cap._GPD = 1;
927 if (acpi_has_method(video->device->handle, "_SPD"))
928 video->cap._SPD = 1;
929 if (acpi_has_method(video->device->handle, "_VPO"))
930 video->cap._VPO = 1;
931 }
932
933 /*
934 * Check whether the video bus device has required AML method to
935 * support the desired features
936 */
937
938 static int acpi_video_bus_check(struct acpi_video_bus *video)
939 {
940 acpi_status status = -ENOENT;
941 struct pci_dev *dev;
942
943 if (!video)
944 return -EINVAL;
945
946 dev = acpi_get_pci_dev(video->device->handle);
947 if (!dev)
948 return -ENODEV;
949 pci_dev_put(dev);
950
951 /*
952 * Since there is no HID, CID and so on for VGA driver, we have
953 * to check well known required nodes.
954 */
955
956 /* Does this device support video switching? */
957 if (video->cap._DOS || video->cap._DOD) {
958 if (!video->cap._DOS) {
959 printk(KERN_WARNING FW_BUG
960 "ACPI(%s) defines _DOD but not _DOS\n",
961 acpi_device_bid(video->device));
962 }
963 video->flags.multihead = 1;
964 status = 0;
965 }
966
967 /* Does this device support retrieving a video ROM? */
968 if (video->cap._ROM) {
969 video->flags.rom = 1;
970 status = 0;
971 }
972
973 /* Does this device support configuring which video device to POST? */
974 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
975 video->flags.post = 1;
976 status = 0;
977 }
978
979 return status;
980 }
981
982 /*
983 * --------------------------------------------------------------------------
984 * Driver Interface
985 * --------------------------------------------------------------------------
986 */
987
988 /* device interface */
989 static struct acpi_video_device_attrib *
990 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
991 {
992 struct acpi_video_enumerated_device *ids;
993 int i;
994
995 for (i = 0; i < video->attached_count; i++) {
996 ids = &video->attached_array[i];
997 if ((ids->value.int_val & 0xffff) == device_id)
998 return &ids->value.attrib;
999 }
1000
1001 return NULL;
1002 }
1003
1004 static int
1005 acpi_video_get_device_type(struct acpi_video_bus *video,
1006 unsigned long device_id)
1007 {
1008 struct acpi_video_enumerated_device *ids;
1009 int i;
1010
1011 for (i = 0; i < video->attached_count; i++) {
1012 ids = &video->attached_array[i];
1013 if ((ids->value.int_val & 0xffff) == device_id)
1014 return ids->value.int_val;
1015 }
1016
1017 return 0;
1018 }
1019
1020 static int
1021 acpi_video_bus_get_one_device(struct acpi_device *device,
1022 struct acpi_video_bus *video)
1023 {
1024 unsigned long long device_id;
1025 int status, device_type;
1026 struct acpi_video_device *data;
1027 struct acpi_video_device_attrib *attribute;
1028
1029 status =
1030 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1031 /* Some device omits _ADR, we skip them instead of fail */
1032 if (ACPI_FAILURE(status))
1033 return 0;
1034
1035 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1036 if (!data)
1037 return -ENOMEM;
1038
1039 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1040 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1041 device->driver_data = data;
1042
1043 data->device_id = device_id;
1044 data->video = video;
1045 data->dev = device;
1046 INIT_DELAYED_WORK(&data->switch_brightness_work,
1047 acpi_video_switch_brightness);
1048
1049 attribute = acpi_video_get_device_attr(video, device_id);
1050
1051 if (attribute && (attribute->device_id_scheme || device_id_scheme)) {
1052 switch (attribute->display_type) {
1053 case ACPI_VIDEO_DISPLAY_CRT:
1054 data->flags.crt = 1;
1055 break;
1056 case ACPI_VIDEO_DISPLAY_TV:
1057 data->flags.tvout = 1;
1058 break;
1059 case ACPI_VIDEO_DISPLAY_DVI:
1060 data->flags.dvi = 1;
1061 break;
1062 case ACPI_VIDEO_DISPLAY_LCD:
1063 data->flags.lcd = 1;
1064 break;
1065 default:
1066 data->flags.unknown = 1;
1067 break;
1068 }
1069 if (attribute->bios_can_detect)
1070 data->flags.bios = 1;
1071 } else {
1072 /* Check for legacy IDs */
1073 device_type = acpi_video_get_device_type(video, device_id);
1074 /* Ignore bits 16 and 18-20 */
1075 switch (device_type & 0xffe2ffff) {
1076 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1077 data->flags.crt = 1;
1078 break;
1079 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1080 data->flags.lcd = 1;
1081 break;
1082 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1083 data->flags.tvout = 1;
1084 break;
1085 default:
1086 data->flags.unknown = 1;
1087 }
1088 }
1089
1090 acpi_video_device_bind(video, data);
1091 acpi_video_device_find_cap(data);
1092
1093 mutex_lock(&video->device_list_lock);
1094 list_add_tail(&data->entry, &video->video_device_list);
1095 mutex_unlock(&video->device_list_lock);
1096
1097 return status;
1098 }
1099
1100 /*
1101 * Arg:
1102 * video : video bus device
1103 *
1104 * Return:
1105 * none
1106 *
1107 * Enumerate the video device list of the video bus,
1108 * bind the ids with the corresponding video devices
1109 * under the video bus.
1110 */
1111
1112 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1113 {
1114 struct acpi_video_device *dev;
1115
1116 mutex_lock(&video->device_list_lock);
1117
1118 list_for_each_entry(dev, &video->video_device_list, entry)
1119 acpi_video_device_bind(video, dev);
1120
1121 mutex_unlock(&video->device_list_lock);
1122 }
1123
1124 /*
1125 * Arg:
1126 * video : video bus device
1127 * device : video output device under the video
1128 * bus
1129 *
1130 * Return:
1131 * none
1132 *
1133 * Bind the ids with the corresponding video devices
1134 * under the video bus.
1135 */
1136
1137 static void
1138 acpi_video_device_bind(struct acpi_video_bus *video,
1139 struct acpi_video_device *device)
1140 {
1141 struct acpi_video_enumerated_device *ids;
1142 int i;
1143
1144 for (i = 0; i < video->attached_count; i++) {
1145 ids = &video->attached_array[i];
1146 if (device->device_id == (ids->value.int_val & 0xffff)) {
1147 ids->bind_info = device;
1148 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1149 }
1150 }
1151 }
1152
1153 static bool acpi_video_device_in_dod(struct acpi_video_device *device)
1154 {
1155 struct acpi_video_bus *video = device->video;
1156 int i;
1157
1158 /*
1159 * If we have a broken _DOD or we have more than 8 output devices
1160 * under the graphics controller node that we can't proper deal with
1161 * in the operation region code currently, no need to test.
1162 */
1163 if (!video->attached_count || video->child_count > 8)
1164 return true;
1165
1166 for (i = 0; i < video->attached_count; i++) {
1167 if ((video->attached_array[i].value.int_val & 0xfff) ==
1168 (device->device_id & 0xfff))
1169 return true;
1170 }
1171
1172 return false;
1173 }
1174
1175 /*
1176 * Arg:
1177 * video : video bus device
1178 *
1179 * Return:
1180 * < 0 : error
1181 *
1182 * Call _DOD to enumerate all devices attached to display adapter
1183 *
1184 */
1185
1186 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1187 {
1188 int status;
1189 int count;
1190 int i;
1191 struct acpi_video_enumerated_device *active_list;
1192 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1193 union acpi_object *dod = NULL;
1194 union acpi_object *obj;
1195
1196 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1197 if (!ACPI_SUCCESS(status)) {
1198 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1199 return status;
1200 }
1201
1202 dod = buffer.pointer;
1203 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1204 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1205 status = -EFAULT;
1206 goto out;
1207 }
1208
1209 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1210 dod->package.count));
1211
1212 active_list = kcalloc(1 + dod->package.count,
1213 sizeof(struct acpi_video_enumerated_device),
1214 GFP_KERNEL);
1215 if (!active_list) {
1216 status = -ENOMEM;
1217 goto out;
1218 }
1219
1220 count = 0;
1221 for (i = 0; i < dod->package.count; i++) {
1222 obj = &dod->package.elements[i];
1223
1224 if (obj->type != ACPI_TYPE_INTEGER) {
1225 printk(KERN_ERR PREFIX
1226 "Invalid _DOD data in element %d\n", i);
1227 continue;
1228 }
1229
1230 active_list[count].value.int_val = obj->integer.value;
1231 active_list[count].bind_info = NULL;
1232 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1233 (int)obj->integer.value));
1234 count++;
1235 }
1236
1237 kfree(video->attached_array);
1238
1239 video->attached_array = active_list;
1240 video->attached_count = count;
1241
1242 out:
1243 kfree(buffer.pointer);
1244 return status;
1245 }
1246
1247 static int
1248 acpi_video_get_next_level(struct acpi_video_device *device,
1249 u32 level_current, u32 event)
1250 {
1251 int min, max, min_above, max_below, i, l, delta = 255;
1252 max = max_below = 0;
1253 min = min_above = 255;
1254 /* Find closest level to level_current */
1255 for (i = 2; i < device->brightness->count; i++) {
1256 l = device->brightness->levels[i];
1257 if (abs(l - level_current) < abs(delta)) {
1258 delta = l - level_current;
1259 if (!delta)
1260 break;
1261 }
1262 }
1263 /* Ajust level_current to closest available level */
1264 level_current += delta;
1265 for (i = 2; i < device->brightness->count; i++) {
1266 l = device->brightness->levels[i];
1267 if (l < min)
1268 min = l;
1269 if (l > max)
1270 max = l;
1271 if (l < min_above && l > level_current)
1272 min_above = l;
1273 if (l > max_below && l < level_current)
1274 max_below = l;
1275 }
1276
1277 switch (event) {
1278 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1279 return (level_current < max) ? min_above : min;
1280 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1281 return (level_current < max) ? min_above : max;
1282 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1283 return (level_current > min) ? max_below : min;
1284 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1285 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1286 return 0;
1287 default:
1288 return level_current;
1289 }
1290 }
1291
1292 static void
1293 acpi_video_switch_brightness(struct work_struct *work)
1294 {
1295 struct acpi_video_device *device = container_of(to_delayed_work(work),
1296 struct acpi_video_device, switch_brightness_work);
1297 unsigned long long level_current, level_next;
1298 int event = device->switch_brightness_event;
1299 int result = -EINVAL;
1300
1301 /* no warning message if acpi_backlight=vendor or a quirk is used */
1302 if (!device->backlight)
1303 return;
1304
1305 if (!device->brightness)
1306 goto out;
1307
1308 result = acpi_video_device_lcd_get_level_current(device,
1309 &level_current,
1310 false);
1311 if (result)
1312 goto out;
1313
1314 level_next = acpi_video_get_next_level(device, level_current, event);
1315
1316 result = acpi_video_device_lcd_set_level(device, level_next);
1317
1318 if (!result)
1319 backlight_force_update(device->backlight,
1320 BACKLIGHT_UPDATE_HOTKEY);
1321
1322 out:
1323 if (result)
1324 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1325 }
1326
1327 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1328 void **edid)
1329 {
1330 struct acpi_video_bus *video;
1331 struct acpi_video_device *video_device;
1332 union acpi_object *buffer = NULL;
1333 acpi_status status;
1334 int i, length;
1335
1336 if (!device || !acpi_driver_data(device))
1337 return -EINVAL;
1338
1339 video = acpi_driver_data(device);
1340
1341 for (i = 0; i < video->attached_count; i++) {
1342 video_device = video->attached_array[i].bind_info;
1343 length = 256;
1344
1345 if (!video_device)
1346 continue;
1347
1348 if (!video_device->cap._DDC)
1349 continue;
1350
1351 if (type) {
1352 switch (type) {
1353 case ACPI_VIDEO_DISPLAY_CRT:
1354 if (!video_device->flags.crt)
1355 continue;
1356 break;
1357 case ACPI_VIDEO_DISPLAY_TV:
1358 if (!video_device->flags.tvout)
1359 continue;
1360 break;
1361 case ACPI_VIDEO_DISPLAY_DVI:
1362 if (!video_device->flags.dvi)
1363 continue;
1364 break;
1365 case ACPI_VIDEO_DISPLAY_LCD:
1366 if (!video_device->flags.lcd)
1367 continue;
1368 break;
1369 }
1370 } else if (video_device->device_id != device_id) {
1371 continue;
1372 }
1373
1374 status = acpi_video_device_EDID(video_device, &buffer, length);
1375
1376 if (ACPI_FAILURE(status) || !buffer ||
1377 buffer->type != ACPI_TYPE_BUFFER) {
1378 length = 128;
1379 status = acpi_video_device_EDID(video_device, &buffer,
1380 length);
1381 if (ACPI_FAILURE(status) || !buffer ||
1382 buffer->type != ACPI_TYPE_BUFFER) {
1383 continue;
1384 }
1385 }
1386
1387 *edid = buffer->buffer.pointer;
1388 return length;
1389 }
1390
1391 return -ENODEV;
1392 }
1393 EXPORT_SYMBOL(acpi_video_get_edid);
1394
1395 static int
1396 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1397 struct acpi_device *device)
1398 {
1399 int status = 0;
1400 struct acpi_device *dev;
1401
1402 /*
1403 * There are systems where video module known to work fine regardless
1404 * of broken _DOD and ignoring returned value here doesn't cause
1405 * any issues later.
1406 */
1407 acpi_video_device_enumerate(video);
1408
1409 list_for_each_entry(dev, &device->children, node) {
1410
1411 status = acpi_video_bus_get_one_device(dev, video);
1412 if (status) {
1413 dev_err(&dev->dev, "Can't attach device\n");
1414 break;
1415 }
1416 video->child_count++;
1417 }
1418 return status;
1419 }
1420
1421 /* acpi_video interface */
1422
1423 /*
1424 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1425 * preform any automatic brightness change on receiving a notification.
1426 */
1427 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1428 {
1429 return acpi_video_bus_DOS(video, 0,
1430 acpi_osi_is_win8() ? 1 : 0);
1431 }
1432
1433 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1434 {
1435 return acpi_video_bus_DOS(video, 0,
1436 acpi_osi_is_win8() ? 0 : 1);
1437 }
1438
1439 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1440 {
1441 struct acpi_video_bus *video = acpi_driver_data(device);
1442 struct input_dev *input;
1443 int keycode = 0;
1444
1445 if (!video || !video->input)
1446 return;
1447
1448 input = video->input;
1449
1450 switch (event) {
1451 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1452 * most likely via hotkey. */
1453 keycode = KEY_SWITCHVIDEOMODE;
1454 break;
1455
1456 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1457 * connector. */
1458 acpi_video_device_enumerate(video);
1459 acpi_video_device_rebind(video);
1460 keycode = KEY_SWITCHVIDEOMODE;
1461 break;
1462
1463 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1464 keycode = KEY_SWITCHVIDEOMODE;
1465 break;
1466 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1467 keycode = KEY_VIDEO_NEXT;
1468 break;
1469 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1470 keycode = KEY_VIDEO_PREV;
1471 break;
1472
1473 default:
1474 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1475 "Unsupported event [0x%x]\n", event));
1476 break;
1477 }
1478
1479 if (acpi_notifier_call_chain(device, event, 0))
1480 /* Something vetoed the keypress. */
1481 keycode = 0;
1482
1483 if (keycode) {
1484 input_report_key(input, keycode, 1);
1485 input_sync(input);
1486 input_report_key(input, keycode, 0);
1487 input_sync(input);
1488 }
1489
1490 return;
1491 }
1492
1493 static void brightness_switch_event(struct acpi_video_device *video_device,
1494 u32 event)
1495 {
1496 if (!brightness_switch_enabled)
1497 return;
1498
1499 video_device->switch_brightness_event = event;
1500 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10);
1501 }
1502
1503 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1504 {
1505 struct acpi_video_device *video_device = data;
1506 struct acpi_device *device = NULL;
1507 struct acpi_video_bus *bus;
1508 struct input_dev *input;
1509 int keycode = 0;
1510
1511 if (!video_device)
1512 return;
1513
1514 device = video_device->dev;
1515 bus = video_device->video;
1516 input = bus->input;
1517
1518 switch (event) {
1519 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1520 brightness_switch_event(video_device, event);
1521 keycode = KEY_BRIGHTNESS_CYCLE;
1522 break;
1523 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1524 brightness_switch_event(video_device, event);
1525 keycode = KEY_BRIGHTNESSUP;
1526 break;
1527 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1528 brightness_switch_event(video_device, event);
1529 keycode = KEY_BRIGHTNESSDOWN;
1530 break;
1531 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1532 brightness_switch_event(video_device, event);
1533 keycode = KEY_BRIGHTNESS_ZERO;
1534 break;
1535 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1536 brightness_switch_event(video_device, event);
1537 keycode = KEY_DISPLAY_OFF;
1538 break;
1539 default:
1540 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1541 "Unsupported event [0x%x]\n", event));
1542 break;
1543 }
1544
1545 acpi_notifier_call_chain(device, event, 0);
1546
1547 if (keycode) {
1548 input_report_key(input, keycode, 1);
1549 input_sync(input);
1550 input_report_key(input, keycode, 0);
1551 input_sync(input);
1552 }
1553
1554 return;
1555 }
1556
1557 static int acpi_video_resume(struct notifier_block *nb,
1558 unsigned long val, void *ign)
1559 {
1560 struct acpi_video_bus *video;
1561 struct acpi_video_device *video_device;
1562 int i;
1563
1564 switch (val) {
1565 case PM_HIBERNATION_PREPARE:
1566 case PM_SUSPEND_PREPARE:
1567 case PM_RESTORE_PREPARE:
1568 return NOTIFY_DONE;
1569 }
1570
1571 video = container_of(nb, struct acpi_video_bus, pm_nb);
1572
1573 dev_info(&video->device->dev, "Restoring backlight state\n");
1574
1575 for (i = 0; i < video->attached_count; i++) {
1576 video_device = video->attached_array[i].bind_info;
1577 if (video_device && video_device->brightness)
1578 acpi_video_device_lcd_set_level(video_device,
1579 video_device->brightness->curr);
1580 }
1581
1582 return NOTIFY_OK;
1583 }
1584
1585 static acpi_status
1586 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1587 void **return_value)
1588 {
1589 struct acpi_device *device = context;
1590 struct acpi_device *sibling;
1591 int result;
1592
1593 if (handle == device->handle)
1594 return AE_CTRL_TERMINATE;
1595
1596 result = acpi_bus_get_device(handle, &sibling);
1597 if (result)
1598 return AE_OK;
1599
1600 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1601 return AE_ALREADY_EXISTS;
1602
1603 return AE_OK;
1604 }
1605
1606 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1607 {
1608 struct backlight_properties props;
1609 struct pci_dev *pdev;
1610 acpi_handle acpi_parent;
1611 struct device *parent = NULL;
1612 int result;
1613 static int count;
1614 char *name;
1615
1616 result = acpi_video_init_brightness(device);
1617 if (result)
1618 return;
1619
1620 if (disable_backlight_sysfs_if > 0)
1621 return;
1622
1623 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1624 if (!name)
1625 return;
1626 count++;
1627
1628 acpi_get_parent(device->dev->handle, &acpi_parent);
1629
1630 pdev = acpi_get_pci_dev(acpi_parent);
1631 if (pdev) {
1632 parent = &pdev->dev;
1633 pci_dev_put(pdev);
1634 }
1635
1636 memset(&props, 0, sizeof(struct backlight_properties));
1637 props.type = BACKLIGHT_FIRMWARE;
1638 props.max_brightness = device->brightness->count - 3;
1639 device->backlight = backlight_device_register(name,
1640 parent,
1641 device,
1642 &acpi_backlight_ops,
1643 &props);
1644 kfree(name);
1645 if (IS_ERR(device->backlight)) {
1646 device->backlight = NULL;
1647 return;
1648 }
1649
1650 /*
1651 * Save current brightness level in case we have to restore it
1652 * before acpi_video_device_lcd_set_level() is called next time.
1653 */
1654 device->backlight->props.brightness =
1655 acpi_video_get_brightness(device->backlight);
1656
1657 device->cooling_dev = thermal_cooling_device_register("LCD",
1658 device->dev, &video_cooling_ops);
1659 if (IS_ERR(device->cooling_dev)) {
1660 /*
1661 * Set cooling_dev to NULL so we don't crash trying to free it.
1662 * Also, why the hell we are returning early and not attempt to
1663 * register video output if cooling device registration failed?
1664 * -- dtor
1665 */
1666 device->cooling_dev = NULL;
1667 return;
1668 }
1669
1670 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1671 device->cooling_dev->id);
1672 result = sysfs_create_link(&device->dev->dev.kobj,
1673 &device->cooling_dev->device.kobj,
1674 "thermal_cooling");
1675 if (result)
1676 printk(KERN_ERR PREFIX "Create sysfs link\n");
1677 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1678 &device->dev->dev.kobj, "device");
1679 if (result)
1680 printk(KERN_ERR PREFIX "Create sysfs link\n");
1681 }
1682
1683 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video)
1684 {
1685 struct acpi_video_device *dev;
1686 union acpi_object *levels;
1687
1688 mutex_lock(&video->device_list_lock);
1689 list_for_each_entry(dev, &video->video_device_list, entry) {
1690 if (!acpi_video_device_lcd_query_levels(dev, &levels))
1691 kfree(levels);
1692 }
1693 mutex_unlock(&video->device_list_lock);
1694 }
1695
1696 static bool acpi_video_should_register_backlight(struct acpi_video_device *dev)
1697 {
1698 /*
1699 * Do not create backlight device for video output
1700 * device that is not in the enumerated list.
1701 */
1702 if (!acpi_video_device_in_dod(dev)) {
1703 dev_dbg(&dev->dev->dev, "not in _DOD list, ignore\n");
1704 return false;
1705 }
1706
1707 if (only_lcd)
1708 return dev->flags.lcd;
1709 return true;
1710 }
1711
1712 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1713 {
1714 struct acpi_video_device *dev;
1715
1716 if (video->backlight_registered)
1717 return 0;
1718
1719 acpi_video_run_bcl_for_osi(video);
1720
1721 if (acpi_video_get_backlight_type() != acpi_backlight_video)
1722 return 0;
1723
1724 mutex_lock(&video->device_list_lock);
1725 list_for_each_entry(dev, &video->video_device_list, entry) {
1726 if (acpi_video_should_register_backlight(dev))
1727 acpi_video_dev_register_backlight(dev);
1728 }
1729 mutex_unlock(&video->device_list_lock);
1730
1731 video->backlight_registered = true;
1732
1733 video->pm_nb.notifier_call = acpi_video_resume;
1734 video->pm_nb.priority = 0;
1735 return register_pm_notifier(&video->pm_nb);
1736 }
1737
1738 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1739 {
1740 if (device->backlight) {
1741 backlight_device_unregister(device->backlight);
1742 device->backlight = NULL;
1743 }
1744 if (device->brightness) {
1745 kfree(device->brightness->levels);
1746 kfree(device->brightness);
1747 device->brightness = NULL;
1748 }
1749 if (device->cooling_dev) {
1750 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1751 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1752 thermal_cooling_device_unregister(device->cooling_dev);
1753 device->cooling_dev = NULL;
1754 }
1755 }
1756
1757 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1758 {
1759 struct acpi_video_device *dev;
1760 int error;
1761
1762 if (!video->backlight_registered)
1763 return 0;
1764
1765 error = unregister_pm_notifier(&video->pm_nb);
1766
1767 mutex_lock(&video->device_list_lock);
1768 list_for_each_entry(dev, &video->video_device_list, entry)
1769 acpi_video_dev_unregister_backlight(dev);
1770 mutex_unlock(&video->device_list_lock);
1771
1772 video->backlight_registered = false;
1773
1774 return error;
1775 }
1776
1777 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1778 {
1779 acpi_status status;
1780 struct acpi_device *adev = device->dev;
1781
1782 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1783 acpi_video_device_notify, device);
1784 if (ACPI_FAILURE(status))
1785 dev_err(&adev->dev, "Error installing notify handler\n");
1786 else
1787 device->flags.notify = 1;
1788 }
1789
1790 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1791 {
1792 struct input_dev *input;
1793 struct acpi_video_device *dev;
1794 int error;
1795
1796 video->input = input = input_allocate_device();
1797 if (!input) {
1798 error = -ENOMEM;
1799 goto out;
1800 }
1801
1802 error = acpi_video_bus_start_devices(video);
1803 if (error)
1804 goto err_free_input;
1805
1806 snprintf(video->phys, sizeof(video->phys),
1807 "%s/video/input0", acpi_device_hid(video->device));
1808
1809 input->name = acpi_device_name(video->device);
1810 input->phys = video->phys;
1811 input->id.bustype = BUS_HOST;
1812 input->id.product = 0x06;
1813 input->dev.parent = &video->device->dev;
1814 input->evbit[0] = BIT(EV_KEY);
1815 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1816 set_bit(KEY_VIDEO_NEXT, input->keybit);
1817 set_bit(KEY_VIDEO_PREV, input->keybit);
1818 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1819 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1820 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1821 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1822 set_bit(KEY_DISPLAY_OFF, input->keybit);
1823
1824 error = input_register_device(input);
1825 if (error)
1826 goto err_stop_dev;
1827
1828 mutex_lock(&video->device_list_lock);
1829 list_for_each_entry(dev, &video->video_device_list, entry)
1830 acpi_video_dev_add_notify_handler(dev);
1831 mutex_unlock(&video->device_list_lock);
1832
1833 return 0;
1834
1835 err_stop_dev:
1836 acpi_video_bus_stop_devices(video);
1837 err_free_input:
1838 input_free_device(input);
1839 video->input = NULL;
1840 out:
1841 return error;
1842 }
1843
1844 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1845 {
1846 if (dev->flags.notify) {
1847 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1848 acpi_video_device_notify);
1849 dev->flags.notify = 0;
1850 }
1851 }
1852
1853 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1854 {
1855 struct acpi_video_device *dev;
1856
1857 mutex_lock(&video->device_list_lock);
1858 list_for_each_entry(dev, &video->video_device_list, entry)
1859 acpi_video_dev_remove_notify_handler(dev);
1860 mutex_unlock(&video->device_list_lock);
1861
1862 acpi_video_bus_stop_devices(video);
1863 input_unregister_device(video->input);
1864 video->input = NULL;
1865 }
1866
1867 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1868 {
1869 struct acpi_video_device *dev, *next;
1870
1871 mutex_lock(&video->device_list_lock);
1872 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1873 list_del(&dev->entry);
1874 kfree(dev);
1875 }
1876 mutex_unlock(&video->device_list_lock);
1877
1878 return 0;
1879 }
1880
1881 static int instance;
1882
1883 static int acpi_video_bus_add(struct acpi_device *device)
1884 {
1885 struct acpi_video_bus *video;
1886 int error;
1887 acpi_status status;
1888
1889 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1890 device->parent->handle, 1,
1891 acpi_video_bus_match, NULL,
1892 device, NULL);
1893 if (status == AE_ALREADY_EXISTS) {
1894 printk(KERN_WARNING FW_BUG
1895 "Duplicate ACPI video bus devices for the"
1896 " same VGA controller, please try module "
1897 "parameter \"video.allow_duplicates=1\""
1898 "if the current driver doesn't work.\n");
1899 if (!allow_duplicates)
1900 return -ENODEV;
1901 }
1902
1903 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1904 if (!video)
1905 return -ENOMEM;
1906
1907 /* a hack to fix the duplicate name "VID" problem on T61 */
1908 if (!strcmp(device->pnp.bus_id, "VID")) {
1909 if (instance)
1910 device->pnp.bus_id[3] = '0' + instance;
1911 instance++;
1912 }
1913 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1914 if (!strcmp(device->pnp.bus_id, "VGA")) {
1915 if (instance)
1916 device->pnp.bus_id[3] = '0' + instance;
1917 instance++;
1918 }
1919
1920 video->device = device;
1921 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1922 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1923 device->driver_data = video;
1924
1925 acpi_video_bus_find_cap(video);
1926 error = acpi_video_bus_check(video);
1927 if (error)
1928 goto err_free_video;
1929
1930 mutex_init(&video->device_list_lock);
1931 INIT_LIST_HEAD(&video->video_device_list);
1932
1933 error = acpi_video_bus_get_devices(video, device);
1934 if (error)
1935 goto err_put_video;
1936
1937 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
1938 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1939 video->flags.multihead ? "yes" : "no",
1940 video->flags.rom ? "yes" : "no",
1941 video->flags.post ? "yes" : "no");
1942 mutex_lock(&video_list_lock);
1943 list_add_tail(&video->entry, &video_bus_head);
1944 mutex_unlock(&video_list_lock);
1945
1946 acpi_video_bus_register_backlight(video);
1947 acpi_video_bus_add_notify_handler(video);
1948
1949 return 0;
1950
1951 err_put_video:
1952 acpi_video_bus_put_devices(video);
1953 kfree(video->attached_array);
1954 err_free_video:
1955 kfree(video);
1956 device->driver_data = NULL;
1957
1958 return error;
1959 }
1960
1961 static int acpi_video_bus_remove(struct acpi_device *device)
1962 {
1963 struct acpi_video_bus *video = NULL;
1964
1965
1966 if (!device || !acpi_driver_data(device))
1967 return -EINVAL;
1968
1969 video = acpi_driver_data(device);
1970
1971 acpi_video_bus_remove_notify_handler(video);
1972 acpi_video_bus_unregister_backlight(video);
1973 acpi_video_bus_put_devices(video);
1974
1975 mutex_lock(&video_list_lock);
1976 list_del(&video->entry);
1977 mutex_unlock(&video_list_lock);
1978
1979 kfree(video->attached_array);
1980 kfree(video);
1981
1982 return 0;
1983 }
1984
1985 static int __init is_i740(struct pci_dev *dev)
1986 {
1987 if (dev->device == 0x00D1)
1988 return 1;
1989 if (dev->device == 0x7000)
1990 return 1;
1991 return 0;
1992 }
1993
1994 static int __init intel_opregion_present(void)
1995 {
1996 int opregion = 0;
1997 struct pci_dev *dev = NULL;
1998 u32 address;
1999
2000 for_each_pci_dev(dev) {
2001 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2002 continue;
2003 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2004 continue;
2005 /* We don't want to poke around undefined i740 registers */
2006 if (is_i740(dev))
2007 continue;
2008 pci_read_config_dword(dev, 0xfc, &address);
2009 if (!address)
2010 continue;
2011 opregion = 1;
2012 }
2013 return opregion;
2014 }
2015
2016 int acpi_video_register(void)
2017 {
2018 int ret = 0;
2019
2020 mutex_lock(&register_count_mutex);
2021 if (register_count) {
2022 /*
2023 * if the function of acpi_video_register is already called,
2024 * don't register the acpi_vide_bus again and return no error.
2025 */
2026 goto leave;
2027 }
2028
2029 mutex_init(&video_list_lock);
2030 INIT_LIST_HEAD(&video_bus_head);
2031
2032 dmi_check_system(video_dmi_table);
2033
2034 ret = acpi_bus_register_driver(&acpi_video_bus);
2035 if (ret)
2036 goto leave;
2037
2038 /*
2039 * When the acpi_video_bus is loaded successfully, increase
2040 * the counter reference.
2041 */
2042 register_count = 1;
2043
2044 leave:
2045 mutex_unlock(&register_count_mutex);
2046 return ret;
2047 }
2048 EXPORT_SYMBOL(acpi_video_register);
2049
2050 void acpi_video_unregister(void)
2051 {
2052 mutex_lock(&register_count_mutex);
2053 if (register_count) {
2054 acpi_bus_unregister_driver(&acpi_video_bus);
2055 register_count = 0;
2056 }
2057 mutex_unlock(&register_count_mutex);
2058 }
2059 EXPORT_SYMBOL(acpi_video_unregister);
2060
2061 void acpi_video_unregister_backlight(void)
2062 {
2063 struct acpi_video_bus *video;
2064
2065 mutex_lock(&register_count_mutex);
2066 if (register_count) {
2067 mutex_lock(&video_list_lock);
2068 list_for_each_entry(video, &video_bus_head, entry)
2069 acpi_video_bus_unregister_backlight(video);
2070 mutex_unlock(&video_list_lock);
2071 }
2072 mutex_unlock(&register_count_mutex);
2073 }
2074
2075 /*
2076 * This is kind of nasty. Hardware using Intel chipsets may require
2077 * the video opregion code to be run first in order to initialise
2078 * state before any ACPI video calls are made. To handle this we defer
2079 * registration of the video class until the opregion code has run.
2080 */
2081
2082 static int __init acpi_video_init(void)
2083 {
2084 /*
2085 * Let the module load even if ACPI is disabled (e.g. due to
2086 * a broken BIOS) so that i915.ko can still be loaded on such
2087 * old systems without an AcpiOpRegion.
2088 *
2089 * acpi_video_register() will report -ENODEV later as well due
2090 * to acpi_disabled when i915.ko tries to register itself afterwards.
2091 */
2092 if (acpi_disabled)
2093 return 0;
2094
2095 if (intel_opregion_present())
2096 return 0;
2097
2098 return acpi_video_register();
2099 }
2100
2101 static void __exit acpi_video_exit(void)
2102 {
2103 acpi_video_detect_exit();
2104 acpi_video_unregister();
2105
2106 return;
2107 }
2108
2109 module_init(acpi_video_init);
2110 module_exit(acpi_video_exit);
Linux with added FPC-III support