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watchdog: iTCO_wdt: Use device managed resources
[linux-2.6/btrfs-unstable.git] / drivers / acpi / acpi_video.c
blobd00bc0ef87a67a0517a2406cc6149d922d0feea6
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 <linux/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
47 #define MAX_NAME_LEN 20
48
49 #define _COMPONENT ACPI_VIDEO_COMPONENT
50 ACPI_MODULE_NAME("video");
51
52 MODULE_AUTHOR("Bruno Ducrot");
53 MODULE_DESCRIPTION("ACPI Video Driver");
54 MODULE_LICENSE("GPL");
55
56 static bool brightness_switch_enabled = 1;
57 module_param(brightness_switch_enabled, bool, 0644);
58
59 /*
60 * By default, we don't allow duplicate ACPI video bus devices
61 * under the same VGA controller
62 */
63 static bool allow_duplicates;
64 module_param(allow_duplicates, bool, 0644);
65
66 static int disable_backlight_sysfs_if = -1;
67 module_param(disable_backlight_sysfs_if, int, 0444);
68
69 #define REPORT_OUTPUT_KEY_EVENTS 0x01
70 #define REPORT_BRIGHTNESS_KEY_EVENTS 0x02
71 static int report_key_events = -1;
72 module_param(report_key_events, int, 0644);
73 MODULE_PARM_DESC(report_key_events,
74 "0: none, 1: output changes, 2: brightness changes, 3: all");
75
76 static bool device_id_scheme = false;
77 module_param(device_id_scheme, bool, 0444);
78
79 static bool only_lcd = false;
80 module_param(only_lcd, bool, 0444);
81
82 static int register_count;
83 static DEFINE_MUTEX(register_count_mutex);
84 static DEFINE_MUTEX(video_list_lock);
85 static LIST_HEAD(video_bus_head);
86 static int acpi_video_bus_add(struct acpi_device *device);
87 static int acpi_video_bus_remove(struct acpi_device *device);
88 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
89 void acpi_video_detect_exit(void);
90
91 static const struct acpi_device_id video_device_ids[] = {
92 {ACPI_VIDEO_HID, 0},
93 {"", 0},
94 };
95 MODULE_DEVICE_TABLE(acpi, video_device_ids);
96
97 static struct acpi_driver acpi_video_bus = {
98 .name = "video",
99 .class = ACPI_VIDEO_CLASS,
100 .ids = video_device_ids,
101 .ops = {
102 .add = acpi_video_bus_add,
103 .remove = acpi_video_bus_remove,
104 .notify = acpi_video_bus_notify,
105 },
106 };
107
108 struct acpi_video_bus_flags {
109 u8 multihead:1; /* can switch video heads */
110 u8 rom:1; /* can retrieve a video rom */
111 u8 post:1; /* can configure the head to */
112 u8 reserved:5;
113 };
114
115 struct acpi_video_bus_cap {
116 u8 _DOS:1; /* Enable/Disable output switching */
117 u8 _DOD:1; /* Enumerate all devices attached to display adapter */
118 u8 _ROM:1; /* Get ROM Data */
119 u8 _GPD:1; /* Get POST Device */
120 u8 _SPD:1; /* Set POST Device */
121 u8 _VPO:1; /* Video POST Options */
122 u8 reserved:2;
123 };
124
125 struct acpi_video_device_attrib {
126 u32 display_index:4; /* A zero-based instance of the Display */
127 u32 display_port_attachment:4; /* This field differentiates the display type */
128 u32 display_type:4; /* Describe the specific type in use */
129 u32 vendor_specific:4; /* Chipset Vendor Specific */
130 u32 bios_can_detect:1; /* BIOS can detect the device */
131 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to
132 the VGA device. */
133 u32 pipe_id:3; /* For VGA multiple-head devices. */
134 u32 reserved:10; /* Must be 0 */
135 u32 device_id_scheme:1; /* Device ID Scheme */
136 };
137
138 struct acpi_video_enumerated_device {
139 union {
140 u32 int_val;
141 struct acpi_video_device_attrib attrib;
142 } value;
143 struct acpi_video_device *bind_info;
144 };
145
146 struct acpi_video_bus {
147 struct acpi_device *device;
148 bool backlight_registered;
149 u8 dos_setting;
150 struct acpi_video_enumerated_device *attached_array;
151 u8 attached_count;
152 u8 child_count;
153 struct acpi_video_bus_cap cap;
154 struct acpi_video_bus_flags flags;
155 struct list_head video_device_list;
156 struct mutex device_list_lock; /* protects video_device_list */
157 struct list_head entry;
158 struct input_dev *input;
159 char phys[32]; /* for input device */
160 struct notifier_block pm_nb;
161 };
162
163 struct acpi_video_device_flags {
164 u8 crt:1;
165 u8 lcd:1;
166 u8 tvout:1;
167 u8 dvi:1;
168 u8 bios:1;
169 u8 unknown:1;
170 u8 notify:1;
171 u8 reserved:1;
172 };
173
174 struct acpi_video_device_cap {
175 u8 _ADR:1; /* Return the unique ID */
176 u8 _BCL:1; /* Query list of brightness control levels supported */
177 u8 _BCM:1; /* Set the brightness level */
178 u8 _BQC:1; /* Get current brightness level */
179 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
180 u8 _DDC:1; /* Return the EDID for this device */
181 };
182
183 struct acpi_video_device {
184 unsigned long device_id;
185 struct acpi_video_device_flags flags;
186 struct acpi_video_device_cap cap;
187 struct list_head entry;
188 struct delayed_work switch_brightness_work;
189 int switch_brightness_event;
190 struct acpi_video_bus *video;
191 struct acpi_device *dev;
192 struct acpi_video_device_brightness *brightness;
193 struct backlight_device *backlight;
194 struct thermal_cooling_device *cooling_dev;
195 };
196
197 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
198 static void acpi_video_device_rebind(struct acpi_video_bus *video);
199 static void acpi_video_device_bind(struct acpi_video_bus *video,
200 struct acpi_video_device *device);
201 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
202 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
203 int level);
204 static int acpi_video_device_lcd_get_level_current(
205 struct acpi_video_device *device,
206 unsigned long long *level, bool raw);
207 static int acpi_video_get_next_level(struct acpi_video_device *device,
208 u32 level_current, u32 event);
209 static void acpi_video_switch_brightness(struct work_struct *work);
210
211 /* backlight device sysfs support */
212 static int acpi_video_get_brightness(struct backlight_device *bd)
213 {
214 unsigned long long cur_level;
215 int i;
216 struct acpi_video_device *vd = bl_get_data(bd);
217
218 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
219 return -EINVAL;
220 for (i = 2; i < vd->brightness->count; i++) {
221 if (vd->brightness->levels[i] == cur_level)
222 /*
223 * The first two entries are special - see page 575
224 * of the ACPI spec 3.0
225 */
226 return i - 2;
227 }
228 return 0;
229 }
230
231 static int acpi_video_set_brightness(struct backlight_device *bd)
232 {
233 int request_level = bd->props.brightness + 2;
234 struct acpi_video_device *vd = bl_get_data(bd);
235
236 cancel_delayed_work(&vd->switch_brightness_work);
237 return acpi_video_device_lcd_set_level(vd,
238 vd->brightness->levels[request_level]);
239 }
240
241 static const struct backlight_ops acpi_backlight_ops = {
242 .get_brightness = acpi_video_get_brightness,
243 .update_status = acpi_video_set_brightness,
244 };
245
246 /* thermal cooling device callbacks */
247 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
248 long *state)
249 {
250 struct acpi_device *device = cooling_dev->devdata;
251 struct acpi_video_device *video = acpi_driver_data(device);
252
253 *state = video->brightness->count - 3;
254 return 0;
255 }
256
257 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
258 long *state)
259 {
260 struct acpi_device *device = cooling_dev->devdata;
261 struct acpi_video_device *video = acpi_driver_data(device);
262 unsigned long long level;
263 int offset;
264
265 if (acpi_video_device_lcd_get_level_current(video, &level, false))
266 return -EINVAL;
267 for (offset = 2; offset < video->brightness->count; offset++)
268 if (level == video->brightness->levels[offset]) {
269 *state = video->brightness->count - offset - 1;
270 return 0;
271 }
272
273 return -EINVAL;
274 }
275
276 static int
277 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
278 {
279 struct acpi_device *device = cooling_dev->devdata;
280 struct acpi_video_device *video = acpi_driver_data(device);
281 int level;
282
283 if (state >= video->brightness->count - 2)
284 return -EINVAL;
285
286 state = video->brightness->count - state;
287 level = video->brightness->levels[state - 1];
288 return acpi_video_device_lcd_set_level(video, level);
289 }
290
291 static const struct thermal_cooling_device_ops video_cooling_ops = {
292 .get_max_state = video_get_max_state,
293 .get_cur_state = video_get_cur_state,
294 .set_cur_state = video_set_cur_state,
295 };
296
297 /*
298 * --------------------------------------------------------------------------
299 * Video Management
300 * --------------------------------------------------------------------------
301 */
302
303 static int
304 acpi_video_device_lcd_query_levels(acpi_handle handle,
305 union acpi_object **levels)
306 {
307 int status;
308 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
309 union acpi_object *obj;
310
311
312 *levels = NULL;
313
314 status = acpi_evaluate_object(handle, "_BCL", NULL, &buffer);
315 if (!ACPI_SUCCESS(status))
316 return status;
317 obj = (union acpi_object *)buffer.pointer;
318 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
319 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
320 status = -EFAULT;
321 goto err;
322 }
323
324 *levels = obj;
325
326 return 0;
327
328 err:
329 kfree(buffer.pointer);
330
331 return status;
332 }
333
334 static int
335 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
336 {
337 int status;
338 int state;
339
340 status = acpi_execute_simple_method(device->dev->handle,
341 "_BCM", level);
342 if (ACPI_FAILURE(status)) {
343 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
344 return -EIO;
345 }
346
347 device->brightness->curr = level;
348 for (state = 2; state < device->brightness->count; state++)
349 if (level == device->brightness->levels[state]) {
350 if (device->backlight)
351 device->backlight->props.brightness = state - 2;
352 return 0;
353 }
354
355 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
356 return -EINVAL;
357 }
358
359 /*
360 * For some buggy _BQC methods, we need to add a constant value to
361 * the _BQC return value to get the actual current brightness level
362 */
363
364 static int bqc_offset_aml_bug_workaround;
365 static int video_set_bqc_offset(const struct dmi_system_id *d)
366 {
367 bqc_offset_aml_bug_workaround = 9;
368 return 0;
369 }
370
371 static int video_disable_backlight_sysfs_if(
372 const struct dmi_system_id *d)
373 {
374 if (disable_backlight_sysfs_if == -1)
375 disable_backlight_sysfs_if = 1;
376 return 0;
377 }
378
379 static int video_set_device_id_scheme(const struct dmi_system_id *d)
380 {
381 device_id_scheme = true;
382 return 0;
383 }
384
385 static int video_enable_only_lcd(const struct dmi_system_id *d)
386 {
387 only_lcd = true;
388 return 0;
389 }
390
391 static int video_set_report_key_events(const struct dmi_system_id *id)
392 {
393 if (report_key_events == -1)
394 report_key_events = (uintptr_t)id->driver_data;
395 return 0;
396 }
397
398 static struct dmi_system_id video_dmi_table[] = {
399 /*
400 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
401 */
402 {
403 .callback = video_set_bqc_offset,
404 .ident = "Acer Aspire 5720",
405 .matches = {
406 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
407 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
408 },
409 },
410 {
411 .callback = video_set_bqc_offset,
412 .ident = "Acer Aspire 5710Z",
413 .matches = {
414 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
415 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
416 },
417 },
418 {
419 .callback = video_set_bqc_offset,
420 .ident = "eMachines E510",
421 .matches = {
422 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
423 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
424 },
425 },
426 {
427 .callback = video_set_bqc_offset,
428 .ident = "Acer Aspire 5315",
429 .matches = {
430 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
431 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
432 },
433 },
434 {
435 .callback = video_set_bqc_offset,
436 .ident = "Acer Aspire 7720",
437 .matches = {
438 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
439 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
440 },
441 },
442
443 /*
444 * Some machines have a broken acpi-video interface for brightness
445 * control, but still need an acpi_video_device_lcd_set_level() call
446 * on resume to turn the backlight power on. We Enable backlight
447 * control on these systems, but do not register a backlight sysfs
448 * as brightness control does not work.
449 */
450 {
451 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
452 .callback = video_disable_backlight_sysfs_if,
453 .ident = "Toshiba Portege R700",
454 .matches = {
455 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
456 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"),
457 },
458 },
459 {
460 /* https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
461 .callback = video_disable_backlight_sysfs_if,
462 .ident = "Toshiba Portege R830",
463 .matches = {
464 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
465 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R830"),
466 },
467 },
468 {
469 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
470 .callback = video_disable_backlight_sysfs_if,
471 .ident = "Toshiba Satellite R830",
472 .matches = {
473 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
474 DMI_MATCH(DMI_PRODUCT_NAME, "SATELLITE R830"),
475 },
476 },
477 /*
478 * Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set
479 * but the IDs actually follow the Device ID Scheme.
480 */
481 {
482 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
483 .callback = video_set_device_id_scheme,
484 .ident = "ESPRIMO Mobile M9410",
485 .matches = {
486 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
487 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
488 },
489 },
490 /*
491 * Some machines have multiple video output devices, but only the one
492 * that is the type of LCD can do the backlight control so we should not
493 * register backlight interface for other video output devices.
494 */
495 {
496 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
497 .callback = video_enable_only_lcd,
498 .ident = "ESPRIMO Mobile M9410",
499 .matches = {
500 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
501 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
502 },
503 },
504 /*
505 * Some machines report wrong key events on the acpi-bus, suppress
506 * key event reporting on these. Note this is only intended to work
507 * around events which are plain wrong. In some cases we get double
508 * events, in this case acpi-video is considered the canonical source
509 * and the events from the other source should be filtered. E.g.
510 * by calling acpi_video_handles_brightness_key_presses() from the
511 * vendor acpi/wmi driver or by using /lib/udev/hwdb.d/60-keyboard.hwdb
512 */
513 {
514 .callback = video_set_report_key_events,
515 .driver_data = (void *)((uintptr_t)REPORT_OUTPUT_KEY_EVENTS),
516 .ident = "Dell Vostro V131",
517 .matches = {
518 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
519 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
520 },
521 },
522 {}
523 };
524
525 static unsigned long long
526 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
527 unsigned long long bqc_value)
528 {
529 unsigned long long level;
530
531 if (device->brightness->flags._BQC_use_index) {
532 /*
533 * _BQC returns an index that doesn't account for
534 * the first 2 items with special meaning, so we need
535 * to compensate for that by offsetting ourselves
536 */
537 if (device->brightness->flags._BCL_reversed)
538 bqc_value = device->brightness->count - 3 - bqc_value;
539
540 level = device->brightness->levels[bqc_value + 2];
541 } else {
542 level = bqc_value;
543 }
544
545 level += bqc_offset_aml_bug_workaround;
546
547 return level;
548 }
549
550 static int
551 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
552 unsigned long long *level, bool raw)
553 {
554 acpi_status status = AE_OK;
555 int i;
556
557 if (device->cap._BQC || device->cap._BCQ) {
558 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
559
560 status = acpi_evaluate_integer(device->dev->handle, buf,
561 NULL, level);
562 if (ACPI_SUCCESS(status)) {
563 if (raw) {
564 /*
565 * Caller has indicated he wants the raw
566 * value returned by _BQC, so don't furtherly
567 * mess with the value.
568 */
569 return 0;
570 }
571
572 *level = acpi_video_bqc_value_to_level(device, *level);
573
574 for (i = 2; i < device->brightness->count; i++)
575 if (device->brightness->levels[i] == *level) {
576 device->brightness->curr = *level;
577 return 0;
578 }
579 /*
580 * BQC returned an invalid level.
581 * Stop using it.
582 */
583 ACPI_WARNING((AE_INFO,
584 "%s returned an invalid level",
585 buf));
586 device->cap._BQC = device->cap._BCQ = 0;
587 } else {
588 /*
589 * Fixme:
590 * should we return an error or ignore this failure?
591 * dev->brightness->curr is a cached value which stores
592 * the correct current backlight level in most cases.
593 * ACPI video backlight still works w/ buggy _BQC.
594 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
595 */
596 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
597 device->cap._BQC = device->cap._BCQ = 0;
598 }
599 }
600
601 *level = device->brightness->curr;
602 return 0;
603 }
604
605 static int
606 acpi_video_device_EDID(struct acpi_video_device *device,
607 union acpi_object **edid, ssize_t length)
608 {
609 int status;
610 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
611 union acpi_object *obj;
612 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
613 struct acpi_object_list args = { 1, &arg0 };
614
615
616 *edid = NULL;
617
618 if (!device)
619 return -ENODEV;
620 if (length == 128)
621 arg0.integer.value = 1;
622 else if (length == 256)
623 arg0.integer.value = 2;
624 else
625 return -EINVAL;
626
627 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
628 if (ACPI_FAILURE(status))
629 return -ENODEV;
630
631 obj = buffer.pointer;
632
633 if (obj && obj->type == ACPI_TYPE_BUFFER)
634 *edid = obj;
635 else {
636 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
637 status = -EFAULT;
638 kfree(obj);
639 }
640
641 return status;
642 }
643
644 /* bus */
645
646 /*
647 * Arg:
648 * video : video bus device pointer
649 * bios_flag :
650 * 0. The system BIOS should NOT automatically switch(toggle)
651 * the active display output.
652 * 1. The system BIOS should automatically switch (toggle) the
653 * active display output. No switch event.
654 * 2. The _DGS value should be locked.
655 * 3. The system BIOS should not automatically switch (toggle) the
656 * active display output, but instead generate the display switch
657 * event notify code.
658 * lcd_flag :
659 * 0. The system BIOS should automatically control the brightness level
660 * of the LCD when the power changes from AC to DC
661 * 1. The system BIOS should NOT automatically control the brightness
662 * level of the LCD when the power changes from AC to DC.
663 * Return Value:
664 * -EINVAL wrong arg.
665 */
666
667 static int
668 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
669 {
670 acpi_status status;
671
672 if (!video->cap._DOS)
673 return 0;
674
675 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
676 return -EINVAL;
677 video->dos_setting = (lcd_flag << 2) | bios_flag;
678 status = acpi_execute_simple_method(video->device->handle, "_DOS",
679 (lcd_flag << 2) | bios_flag);
680 if (ACPI_FAILURE(status))
681 return -EIO;
682
683 return 0;
684 }
685
686 /*
687 * Simple comparison function used to sort backlight levels.
688 */
689
690 static int
691 acpi_video_cmp_level(const void *a, const void *b)
692 {
693 return *(int *)a - *(int *)b;
694 }
695
696 /*
697 * Decides if _BQC/_BCQ for this system is usable
698 *
699 * We do this by changing the level first and then read out the current
700 * brightness level, if the value does not match, find out if it is using
701 * index. If not, clear the _BQC/_BCQ capability.
702 */
703 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
704 int max_level, int current_level)
705 {
706 struct acpi_video_device_brightness *br = device->brightness;
707 int result;
708 unsigned long long level;
709 int test_level;
710
711 /* don't mess with existing known broken systems */
712 if (bqc_offset_aml_bug_workaround)
713 return 0;
714
715 /*
716 * Some systems always report current brightness level as maximum
717 * through _BQC, we need to test another value for them.
718 */
719 test_level = current_level == max_level ? br->levels[3] : max_level;
720
721 result = acpi_video_device_lcd_set_level(device, test_level);
722 if (result)
723 return result;
724
725 result = acpi_video_device_lcd_get_level_current(device, &level, true);
726 if (result)
727 return result;
728
729 if (level != test_level) {
730 /* buggy _BQC found, need to find out if it uses index */
731 if (level < br->count) {
732 if (br->flags._BCL_reversed)
733 level = br->count - 3 - level;
734 if (br->levels[level + 2] == test_level)
735 br->flags._BQC_use_index = 1;
736 }
737
738 if (!br->flags._BQC_use_index)
739 device->cap._BQC = device->cap._BCQ = 0;
740 }
741
742 return 0;
743 }
744
745 int acpi_video_get_levels(struct acpi_device *device,
746 struct acpi_video_device_brightness **dev_br,
747 int *pmax_level)
748 {
749 union acpi_object *obj = NULL;
750 int i, max_level = 0, count = 0, level_ac_battery = 0;
751 union acpi_object *o;
752 struct acpi_video_device_brightness *br = NULL;
753 int result = 0;
754 u32 value;
755
756 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device->handle,
757 &obj))) {
758 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
759 "LCD brightness level\n"));
760 result = -ENODEV;
761 goto out;
762 }
763
764 if (obj->package.count < 2) {
765 result = -EINVAL;
766 goto out;
767 }
768
769 br = kzalloc(sizeof(*br), GFP_KERNEL);
770 if (!br) {
771 printk(KERN_ERR "can't allocate memory\n");
772 result = -ENOMEM;
773 goto out;
774 }
775
776 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
777 GFP_KERNEL);
778 if (!br->levels) {
779 result = -ENOMEM;
780 goto out_free;
781 }
782
783 for (i = 0; i < obj->package.count; i++) {
784 o = (union acpi_object *)&obj->package.elements[i];
785 if (o->type != ACPI_TYPE_INTEGER) {
786 printk(KERN_ERR PREFIX "Invalid data\n");
787 continue;
788 }
789 value = (u32) o->integer.value;
790 /* Skip duplicate entries */
791 if (count > 2 && br->levels[count - 1] == value)
792 continue;
793
794 br->levels[count] = value;
795
796 if (br->levels[count] > max_level)
797 max_level = br->levels[count];
798 count++;
799 }
800
801 /*
802 * some buggy BIOS don't export the levels
803 * when machine is on AC/Battery in _BCL package.
804 * In this case, the first two elements in _BCL packages
805 * are also supported brightness levels that OS should take care of.
806 */
807 for (i = 2; i < count; i++) {
808 if (br->levels[i] == br->levels[0])
809 level_ac_battery++;
810 if (br->levels[i] == br->levels[1])
811 level_ac_battery++;
812 }
813
814 if (level_ac_battery < 2) {
815 level_ac_battery = 2 - level_ac_battery;
816 br->flags._BCL_no_ac_battery_levels = 1;
817 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
818 br->levels[i] = br->levels[i - level_ac_battery];
819 count += level_ac_battery;
820 } else if (level_ac_battery > 2)
821 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
822
823 /* Check if the _BCL package is in a reversed order */
824 if (max_level == br->levels[2]) {
825 br->flags._BCL_reversed = 1;
826 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
827 acpi_video_cmp_level, NULL);
828 } else if (max_level != br->levels[count - 1])
829 ACPI_ERROR((AE_INFO,
830 "Found unordered _BCL package"));
831
832 br->count = count;
833 *dev_br = br;
834 if (pmax_level)
835 *pmax_level = max_level;
836
837 out:
838 kfree(obj);
839 return result;
840 out_free:
841 kfree(br);
842 goto out;
843 }
844 EXPORT_SYMBOL(acpi_video_get_levels);
845
846 /*
847 * Arg:
848 * device : video output device (LCD, CRT, ..)
849 *
850 * Return Value:
851 * Maximum brightness level
852 *
853 * Allocate and initialize device->brightness.
854 */
855
856 static int
857 acpi_video_init_brightness(struct acpi_video_device *device)
858 {
859 int i, max_level = 0;
860 unsigned long long level, level_old;
861 struct acpi_video_device_brightness *br = NULL;
862 int result = -EINVAL;
863
864 result = acpi_video_get_levels(device->dev, &br, &max_level);
865 if (result)
866 return result;
867 device->brightness = br;
868
869 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
870 br->curr = level = max_level;
871
872 if (!device->cap._BQC)
873 goto set_level;
874
875 result = acpi_video_device_lcd_get_level_current(device,
876 &level_old, true);
877 if (result)
878 goto out_free_levels;
879
880 result = acpi_video_bqc_quirk(device, max_level, level_old);
881 if (result)
882 goto out_free_levels;
883 /*
884 * cap._BQC may get cleared due to _BQC is found to be broken
885 * in acpi_video_bqc_quirk, so check again here.
886 */
887 if (!device->cap._BQC)
888 goto set_level;
889
890 level = acpi_video_bqc_value_to_level(device, level_old);
891 /*
892 * On some buggy laptops, _BQC returns an uninitialized
893 * value when invoked for the first time, i.e.
894 * level_old is invalid (no matter whether it's a level
895 * or an index). Set the backlight to max_level in this case.
896 */
897 for (i = 2; i < br->count; i++)
898 if (level == br->levels[i])
899 break;
900 if (i == br->count || !level)
901 level = max_level;
902
903 set_level:
904 result = acpi_video_device_lcd_set_level(device, level);
905 if (result)
906 goto out_free_levels;
907
908 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
909 "found %d brightness levels\n", br->count - 2));
910 return 0;
911
912 out_free_levels:
913 kfree(br->levels);
914 kfree(br);
915 device->brightness = NULL;
916 return result;
917 }
918
919 /*
920 * Arg:
921 * device : video output device (LCD, CRT, ..)
922 *
923 * Return Value:
924 * None
925 *
926 * Find out all required AML methods defined under the output
927 * device.
928 */
929
930 static void acpi_video_device_find_cap(struct acpi_video_device *device)
931 {
932 if (acpi_has_method(device->dev->handle, "_ADR"))
933 device->cap._ADR = 1;
934 if (acpi_has_method(device->dev->handle, "_BCL"))
935 device->cap._BCL = 1;
936 if (acpi_has_method(device->dev->handle, "_BCM"))
937 device->cap._BCM = 1;
938 if (acpi_has_method(device->dev->handle, "_BQC")) {
939 device->cap._BQC = 1;
940 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
941 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
942 device->cap._BCQ = 1;
943 }
944
945 if (acpi_has_method(device->dev->handle, "_DDC"))
946 device->cap._DDC = 1;
947 }
948
949 /*
950 * Arg:
951 * device : video output device (VGA)
952 *
953 * Return Value:
954 * None
955 *
956 * Find out all required AML methods defined under the video bus device.
957 */
958
959 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
960 {
961 if (acpi_has_method(video->device->handle, "_DOS"))
962 video->cap._DOS = 1;
963 if (acpi_has_method(video->device->handle, "_DOD"))
964 video->cap._DOD = 1;
965 if (acpi_has_method(video->device->handle, "_ROM"))
966 video->cap._ROM = 1;
967 if (acpi_has_method(video->device->handle, "_GPD"))
968 video->cap._GPD = 1;
969 if (acpi_has_method(video->device->handle, "_SPD"))
970 video->cap._SPD = 1;
971 if (acpi_has_method(video->device->handle, "_VPO"))
972 video->cap._VPO = 1;
973 }
974
975 /*
976 * Check whether the video bus device has required AML method to
977 * support the desired features
978 */
979
980 static int acpi_video_bus_check(struct acpi_video_bus *video)
981 {
982 acpi_status status = -ENOENT;
983 struct pci_dev *dev;
984
985 if (!video)
986 return -EINVAL;
987
988 dev = acpi_get_pci_dev(video->device->handle);
989 if (!dev)
990 return -ENODEV;
991 pci_dev_put(dev);
992
993 /*
994 * Since there is no HID, CID and so on for VGA driver, we have
995 * to check well known required nodes.
996 */
997
998 /* Does this device support video switching? */
999 if (video->cap._DOS || video->cap._DOD) {
1000 if (!video->cap._DOS) {
1001 printk(KERN_WARNING FW_BUG
1002 "ACPI(%s) defines _DOD but not _DOS\n",
1003 acpi_device_bid(video->device));
1004 }
1005 video->flags.multihead = 1;
1006 status = 0;
1007 }
1008
1009 /* Does this device support retrieving a video ROM? */
1010 if (video->cap._ROM) {
1011 video->flags.rom = 1;
1012 status = 0;
1013 }
1014
1015 /* Does this device support configuring which video device to POST? */
1016 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1017 video->flags.post = 1;
1018 status = 0;
1019 }
1020
1021 return status;
1022 }
1023
1024 /*
1025 * --------------------------------------------------------------------------
1026 * Driver Interface
1027 * --------------------------------------------------------------------------
1028 */
1029
1030 /* device interface */
1031 static struct acpi_video_device_attrib *
1032 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1033 {
1034 struct acpi_video_enumerated_device *ids;
1035 int i;
1036
1037 for (i = 0; i < video->attached_count; i++) {
1038 ids = &video->attached_array[i];
1039 if ((ids->value.int_val & 0xffff) == device_id)
1040 return &ids->value.attrib;
1041 }
1042
1043 return NULL;
1044 }
1045
1046 static int
1047 acpi_video_get_device_type(struct acpi_video_bus *video,
1048 unsigned long device_id)
1049 {
1050 struct acpi_video_enumerated_device *ids;
1051 int i;
1052
1053 for (i = 0; i < video->attached_count; i++) {
1054 ids = &video->attached_array[i];
1055 if ((ids->value.int_val & 0xffff) == device_id)
1056 return ids->value.int_val;
1057 }
1058
1059 return 0;
1060 }
1061
1062 static int
1063 acpi_video_bus_get_one_device(struct acpi_device *device,
1064 struct acpi_video_bus *video)
1065 {
1066 unsigned long long device_id;
1067 int status, device_type;
1068 struct acpi_video_device *data;
1069 struct acpi_video_device_attrib *attribute;
1070
1071 status =
1072 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1073 /* Some device omits _ADR, we skip them instead of fail */
1074 if (ACPI_FAILURE(status))
1075 return 0;
1076
1077 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1078 if (!data)
1079 return -ENOMEM;
1080
1081 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1082 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1083 device->driver_data = data;
1084
1085 data->device_id = device_id;
1086 data->video = video;
1087 data->dev = device;
1088 INIT_DELAYED_WORK(&data->switch_brightness_work,
1089 acpi_video_switch_brightness);
1090
1091 attribute = acpi_video_get_device_attr(video, device_id);
1092
1093 if (attribute && (attribute->device_id_scheme || device_id_scheme)) {
1094 switch (attribute->display_type) {
1095 case ACPI_VIDEO_DISPLAY_CRT:
1096 data->flags.crt = 1;
1097 break;
1098 case ACPI_VIDEO_DISPLAY_TV:
1099 data->flags.tvout = 1;
1100 break;
1101 case ACPI_VIDEO_DISPLAY_DVI:
1102 data->flags.dvi = 1;
1103 break;
1104 case ACPI_VIDEO_DISPLAY_LCD:
1105 data->flags.lcd = 1;
1106 break;
1107 default:
1108 data->flags.unknown = 1;
1109 break;
1110 }
1111 if (attribute->bios_can_detect)
1112 data->flags.bios = 1;
1113 } else {
1114 /* Check for legacy IDs */
1115 device_type = acpi_video_get_device_type(video, device_id);
1116 /* Ignore bits 16 and 18-20 */
1117 switch (device_type & 0xffe2ffff) {
1118 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1119 data->flags.crt = 1;
1120 break;
1121 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1122 data->flags.lcd = 1;
1123 break;
1124 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1125 data->flags.tvout = 1;
1126 break;
1127 default:
1128 data->flags.unknown = 1;
1129 }
1130 }
1131
1132 acpi_video_device_bind(video, data);
1133 acpi_video_device_find_cap(data);
1134
1135 mutex_lock(&video->device_list_lock);
1136 list_add_tail(&data->entry, &video->video_device_list);
1137 mutex_unlock(&video->device_list_lock);
1138
1139 return status;
1140 }
1141
1142 /*
1143 * Arg:
1144 * video : video bus device
1145 *
1146 * Return:
1147 * none
1148 *
1149 * Enumerate the video device list of the video bus,
1150 * bind the ids with the corresponding video devices
1151 * under the video bus.
1152 */
1153
1154 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1155 {
1156 struct acpi_video_device *dev;
1157
1158 mutex_lock(&video->device_list_lock);
1159
1160 list_for_each_entry(dev, &video->video_device_list, entry)
1161 acpi_video_device_bind(video, dev);
1162
1163 mutex_unlock(&video->device_list_lock);
1164 }
1165
1166 /*
1167 * Arg:
1168 * video : video bus device
1169 * device : video output device under the video
1170 * bus
1171 *
1172 * Return:
1173 * none
1174 *
1175 * Bind the ids with the corresponding video devices
1176 * under the video bus.
1177 */
1178
1179 static void
1180 acpi_video_device_bind(struct acpi_video_bus *video,
1181 struct acpi_video_device *device)
1182 {
1183 struct acpi_video_enumerated_device *ids;
1184 int i;
1185
1186 for (i = 0; i < video->attached_count; i++) {
1187 ids = &video->attached_array[i];
1188 if (device->device_id == (ids->value.int_val & 0xffff)) {
1189 ids->bind_info = device;
1190 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1191 }
1192 }
1193 }
1194
1195 static bool acpi_video_device_in_dod(struct acpi_video_device *device)
1196 {
1197 struct acpi_video_bus *video = device->video;
1198 int i;
1199
1200 /*
1201 * If we have a broken _DOD or we have more than 8 output devices
1202 * under the graphics controller node that we can't proper deal with
1203 * in the operation region code currently, no need to test.
1204 */
1205 if (!video->attached_count || video->child_count > 8)
1206 return true;
1207
1208 for (i = 0; i < video->attached_count; i++) {
1209 if ((video->attached_array[i].value.int_val & 0xfff) ==
1210 (device->device_id & 0xfff))
1211 return true;
1212 }
1213
1214 return false;
1215 }
1216
1217 /*
1218 * Arg:
1219 * video : video bus device
1220 *
1221 * Return:
1222 * < 0 : error
1223 *
1224 * Call _DOD to enumerate all devices attached to display adapter
1225 *
1226 */
1227
1228 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1229 {
1230 int status;
1231 int count;
1232 int i;
1233 struct acpi_video_enumerated_device *active_list;
1234 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1235 union acpi_object *dod = NULL;
1236 union acpi_object *obj;
1237
1238 if (!video->cap._DOD)
1239 return AE_NOT_EXIST;
1240
1241 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1242 if (!ACPI_SUCCESS(status)) {
1243 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1244 return status;
1245 }
1246
1247 dod = buffer.pointer;
1248 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1249 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1250 status = -EFAULT;
1251 goto out;
1252 }
1253
1254 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1255 dod->package.count));
1256
1257 active_list = kcalloc(1 + dod->package.count,
1258 sizeof(struct acpi_video_enumerated_device),
1259 GFP_KERNEL);
1260 if (!active_list) {
1261 status = -ENOMEM;
1262 goto out;
1263 }
1264
1265 count = 0;
1266 for (i = 0; i < dod->package.count; i++) {
1267 obj = &dod->package.elements[i];
1268
1269 if (obj->type != ACPI_TYPE_INTEGER) {
1270 printk(KERN_ERR PREFIX
1271 "Invalid _DOD data in element %d\n", i);
1272 continue;
1273 }
1274
1275 active_list[count].value.int_val = obj->integer.value;
1276 active_list[count].bind_info = NULL;
1277 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1278 (int)obj->integer.value));
1279 count++;
1280 }
1281
1282 kfree(video->attached_array);
1283
1284 video->attached_array = active_list;
1285 video->attached_count = count;
1286
1287 out:
1288 kfree(buffer.pointer);
1289 return status;
1290 }
1291
1292 static int
1293 acpi_video_get_next_level(struct acpi_video_device *device,
1294 u32 level_current, u32 event)
1295 {
1296 int min, max, min_above, max_below, i, l, delta = 255;
1297 max = max_below = 0;
1298 min = min_above = 255;
1299 /* Find closest level to level_current */
1300 for (i = 2; i < device->brightness->count; i++) {
1301 l = device->brightness->levels[i];
1302 if (abs(l - level_current) < abs(delta)) {
1303 delta = l - level_current;
1304 if (!delta)
1305 break;
1306 }
1307 }
1308 /* Ajust level_current to closest available level */
1309 level_current += delta;
1310 for (i = 2; i < device->brightness->count; i++) {
1311 l = device->brightness->levels[i];
1312 if (l < min)
1313 min = l;
1314 if (l > max)
1315 max = l;
1316 if (l < min_above && l > level_current)
1317 min_above = l;
1318 if (l > max_below && l < level_current)
1319 max_below = l;
1320 }
1321
1322 switch (event) {
1323 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1324 return (level_current < max) ? min_above : min;
1325 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1326 return (level_current < max) ? min_above : max;
1327 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1328 return (level_current > min) ? max_below : min;
1329 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1330 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1331 return 0;
1332 default:
1333 return level_current;
1334 }
1335 }
1336
1337 static void
1338 acpi_video_switch_brightness(struct work_struct *work)
1339 {
1340 struct acpi_video_device *device = container_of(to_delayed_work(work),
1341 struct acpi_video_device, switch_brightness_work);
1342 unsigned long long level_current, level_next;
1343 int event = device->switch_brightness_event;
1344 int result = -EINVAL;
1345
1346 /* no warning message if acpi_backlight=vendor or a quirk is used */
1347 if (!device->backlight)
1348 return;
1349
1350 if (!device->brightness)
1351 goto out;
1352
1353 result = acpi_video_device_lcd_get_level_current(device,
1354 &level_current,
1355 false);
1356 if (result)
1357 goto out;
1358
1359 level_next = acpi_video_get_next_level(device, level_current, event);
1360
1361 result = acpi_video_device_lcd_set_level(device, level_next);
1362
1363 if (!result)
1364 backlight_force_update(device->backlight,
1365 BACKLIGHT_UPDATE_HOTKEY);
1366
1367 out:
1368 if (result)
1369 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1370 }
1371
1372 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1373 void **edid)
1374 {
1375 struct acpi_video_bus *video;
1376 struct acpi_video_device *video_device;
1377 union acpi_object *buffer = NULL;
1378 acpi_status status;
1379 int i, length;
1380
1381 if (!device || !acpi_driver_data(device))
1382 return -EINVAL;
1383
1384 video = acpi_driver_data(device);
1385
1386 for (i = 0; i < video->attached_count; i++) {
1387 video_device = video->attached_array[i].bind_info;
1388 length = 256;
1389
1390 if (!video_device)
1391 continue;
1392
1393 if (!video_device->cap._DDC)
1394 continue;
1395
1396 if (type) {
1397 switch (type) {
1398 case ACPI_VIDEO_DISPLAY_CRT:
1399 if (!video_device->flags.crt)
1400 continue;
1401 break;
1402 case ACPI_VIDEO_DISPLAY_TV:
1403 if (!video_device->flags.tvout)
1404 continue;
1405 break;
1406 case ACPI_VIDEO_DISPLAY_DVI:
1407 if (!video_device->flags.dvi)
1408 continue;
1409 break;
1410 case ACPI_VIDEO_DISPLAY_LCD:
1411 if (!video_device->flags.lcd)
1412 continue;
1413 break;
1414 }
1415 } else if (video_device->device_id != device_id) {
1416 continue;
1417 }
1418
1419 status = acpi_video_device_EDID(video_device, &buffer, length);
1420
1421 if (ACPI_FAILURE(status) || !buffer ||
1422 buffer->type != ACPI_TYPE_BUFFER) {
1423 length = 128;
1424 status = acpi_video_device_EDID(video_device, &buffer,
1425 length);
1426 if (ACPI_FAILURE(status) || !buffer ||
1427 buffer->type != ACPI_TYPE_BUFFER) {
1428 continue;
1429 }
1430 }
1431
1432 *edid = buffer->buffer.pointer;
1433 return length;
1434 }
1435
1436 return -ENODEV;
1437 }
1438 EXPORT_SYMBOL(acpi_video_get_edid);
1439
1440 static int
1441 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1442 struct acpi_device *device)
1443 {
1444 int status = 0;
1445 struct acpi_device *dev;
1446
1447 /*
1448 * There are systems where video module known to work fine regardless
1449 * of broken _DOD and ignoring returned value here doesn't cause
1450 * any issues later.
1451 */
1452 acpi_video_device_enumerate(video);
1453
1454 list_for_each_entry(dev, &device->children, node) {
1455
1456 status = acpi_video_bus_get_one_device(dev, video);
1457 if (status) {
1458 dev_err(&dev->dev, "Can't attach device\n");
1459 break;
1460 }
1461 video->child_count++;
1462 }
1463 return status;
1464 }
1465
1466 /* acpi_video interface */
1467
1468 /*
1469 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1470 * preform any automatic brightness change on receiving a notification.
1471 */
1472 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1473 {
1474 return acpi_video_bus_DOS(video, 0,
1475 acpi_osi_is_win8() ? 1 : 0);
1476 }
1477
1478 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1479 {
1480 return acpi_video_bus_DOS(video, 0,
1481 acpi_osi_is_win8() ? 0 : 1);
1482 }
1483
1484 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1485 {
1486 struct acpi_video_bus *video = acpi_driver_data(device);
1487 struct input_dev *input;
1488 int keycode = 0;
1489
1490 if (!video || !video->input)
1491 return;
1492
1493 input = video->input;
1494
1495 switch (event) {
1496 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1497 * most likely via hotkey. */
1498 keycode = KEY_SWITCHVIDEOMODE;
1499 break;
1500
1501 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1502 * connector. */
1503 acpi_video_device_enumerate(video);
1504 acpi_video_device_rebind(video);
1505 keycode = KEY_SWITCHVIDEOMODE;
1506 break;
1507
1508 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1509 keycode = KEY_SWITCHVIDEOMODE;
1510 break;
1511 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1512 keycode = KEY_VIDEO_NEXT;
1513 break;
1514 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1515 keycode = KEY_VIDEO_PREV;
1516 break;
1517
1518 default:
1519 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1520 "Unsupported event [0x%x]\n", event));
1521 break;
1522 }
1523
1524 if (acpi_notifier_call_chain(device, event, 0))
1525 /* Something vetoed the keypress. */
1526 keycode = 0;
1527
1528 if (keycode && (report_key_events & REPORT_OUTPUT_KEY_EVENTS)) {
1529 input_report_key(input, keycode, 1);
1530 input_sync(input);
1531 input_report_key(input, keycode, 0);
1532 input_sync(input);
1533 }
1534
1535 return;
1536 }
1537
1538 static void brightness_switch_event(struct acpi_video_device *video_device,
1539 u32 event)
1540 {
1541 if (!brightness_switch_enabled)
1542 return;
1543
1544 video_device->switch_brightness_event = event;
1545 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10);
1546 }
1547
1548 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1549 {
1550 struct acpi_video_device *video_device = data;
1551 struct acpi_device *device = NULL;
1552 struct acpi_video_bus *bus;
1553 struct input_dev *input;
1554 int keycode = 0;
1555
1556 if (!video_device)
1557 return;
1558
1559 device = video_device->dev;
1560 bus = video_device->video;
1561 input = bus->input;
1562
1563 switch (event) {
1564 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1565 brightness_switch_event(video_device, event);
1566 keycode = KEY_BRIGHTNESS_CYCLE;
1567 break;
1568 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1569 brightness_switch_event(video_device, event);
1570 keycode = KEY_BRIGHTNESSUP;
1571 break;
1572 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1573 brightness_switch_event(video_device, event);
1574 keycode = KEY_BRIGHTNESSDOWN;
1575 break;
1576 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1577 brightness_switch_event(video_device, event);
1578 keycode = KEY_BRIGHTNESS_ZERO;
1579 break;
1580 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1581 brightness_switch_event(video_device, event);
1582 keycode = KEY_DISPLAY_OFF;
1583 break;
1584 default:
1585 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1586 "Unsupported event [0x%x]\n", event));
1587 break;
1588 }
1589
1590 acpi_notifier_call_chain(device, event, 0);
1591
1592 if (keycode && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS)) {
1593 input_report_key(input, keycode, 1);
1594 input_sync(input);
1595 input_report_key(input, keycode, 0);
1596 input_sync(input);
1597 }
1598
1599 return;
1600 }
1601
1602 static int acpi_video_resume(struct notifier_block *nb,
1603 unsigned long val, void *ign)
1604 {
1605 struct acpi_video_bus *video;
1606 struct acpi_video_device *video_device;
1607 int i;
1608
1609 switch (val) {
1610 case PM_HIBERNATION_PREPARE:
1611 case PM_SUSPEND_PREPARE:
1612 case PM_RESTORE_PREPARE:
1613 return NOTIFY_DONE;
1614 }
1615
1616 video = container_of(nb, struct acpi_video_bus, pm_nb);
1617
1618 dev_info(&video->device->dev, "Restoring backlight state\n");
1619
1620 for (i = 0; i < video->attached_count; i++) {
1621 video_device = video->attached_array[i].bind_info;
1622 if (video_device && video_device->brightness)
1623 acpi_video_device_lcd_set_level(video_device,
1624 video_device->brightness->curr);
1625 }
1626
1627 return NOTIFY_OK;
1628 }
1629
1630 static acpi_status
1631 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1632 void **return_value)
1633 {
1634 struct acpi_device *device = context;
1635 struct acpi_device *sibling;
1636 int result;
1637
1638 if (handle == device->handle)
1639 return AE_CTRL_TERMINATE;
1640
1641 result = acpi_bus_get_device(handle, &sibling);
1642 if (result)
1643 return AE_OK;
1644
1645 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1646 return AE_ALREADY_EXISTS;
1647
1648 return AE_OK;
1649 }
1650
1651 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1652 {
1653 struct backlight_properties props;
1654 struct pci_dev *pdev;
1655 acpi_handle acpi_parent;
1656 struct device *parent = NULL;
1657 int result;
1658 static int count;
1659 char *name;
1660
1661 result = acpi_video_init_brightness(device);
1662 if (result)
1663 return;
1664
1665 if (disable_backlight_sysfs_if > 0)
1666 return;
1667
1668 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1669 if (!name)
1670 return;
1671 count++;
1672
1673 acpi_get_parent(device->dev->handle, &acpi_parent);
1674
1675 pdev = acpi_get_pci_dev(acpi_parent);
1676 if (pdev) {
1677 parent = &pdev->dev;
1678 pci_dev_put(pdev);
1679 }
1680
1681 memset(&props, 0, sizeof(struct backlight_properties));
1682 props.type = BACKLIGHT_FIRMWARE;
1683 props.max_brightness = device->brightness->count - 3;
1684 device->backlight = backlight_device_register(name,
1685 parent,
1686 device,
1687 &acpi_backlight_ops,
1688 &props);
1689 kfree(name);
1690 if (IS_ERR(device->backlight)) {
1691 device->backlight = NULL;
1692 return;
1693 }
1694
1695 /*
1696 * Save current brightness level in case we have to restore it
1697 * before acpi_video_device_lcd_set_level() is called next time.
1698 */
1699 device->backlight->props.brightness =
1700 acpi_video_get_brightness(device->backlight);
1701
1702 device->cooling_dev = thermal_cooling_device_register("LCD",
1703 device->dev, &video_cooling_ops);
1704 if (IS_ERR(device->cooling_dev)) {
1705 /*
1706 * Set cooling_dev to NULL so we don't crash trying to free it.
1707 * Also, why the hell we are returning early and not attempt to
1708 * register video output if cooling device registration failed?
1709 * -- dtor
1710 */
1711 device->cooling_dev = NULL;
1712 return;
1713 }
1714
1715 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1716 device->cooling_dev->id);
1717 result = sysfs_create_link(&device->dev->dev.kobj,
1718 &device->cooling_dev->device.kobj,
1719 "thermal_cooling");
1720 if (result)
1721 printk(KERN_ERR PREFIX "Create sysfs link\n");
1722 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1723 &device->dev->dev.kobj, "device");
1724 if (result)
1725 printk(KERN_ERR PREFIX "Create sysfs link\n");
1726 }
1727
1728 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video)
1729 {
1730 struct acpi_video_device *dev;
1731 union acpi_object *levels;
1732
1733 mutex_lock(&video->device_list_lock);
1734 list_for_each_entry(dev, &video->video_device_list, entry) {
1735 if (!acpi_video_device_lcd_query_levels(dev->dev->handle, &levels))
1736 kfree(levels);
1737 }
1738 mutex_unlock(&video->device_list_lock);
1739 }
1740
1741 static bool acpi_video_should_register_backlight(struct acpi_video_device *dev)
1742 {
1743 /*
1744 * Do not create backlight device for video output
1745 * device that is not in the enumerated list.
1746 */
1747 if (!acpi_video_device_in_dod(dev)) {
1748 dev_dbg(&dev->dev->dev, "not in _DOD list, ignore\n");
1749 return false;
1750 }
1751
1752 if (only_lcd)
1753 return dev->flags.lcd;
1754 return true;
1755 }
1756
1757 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1758 {
1759 struct acpi_video_device *dev;
1760
1761 if (video->backlight_registered)
1762 return 0;
1763
1764 acpi_video_run_bcl_for_osi(video);
1765
1766 if (acpi_video_get_backlight_type() != acpi_backlight_video)
1767 return 0;
1768
1769 mutex_lock(&video->device_list_lock);
1770 list_for_each_entry(dev, &video->video_device_list, entry) {
1771 if (acpi_video_should_register_backlight(dev))
1772 acpi_video_dev_register_backlight(dev);
1773 }
1774 mutex_unlock(&video->device_list_lock);
1775
1776 video->backlight_registered = true;
1777
1778 video->pm_nb.notifier_call = acpi_video_resume;
1779 video->pm_nb.priority = 0;
1780 return register_pm_notifier(&video->pm_nb);
1781 }
1782
1783 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1784 {
1785 if (device->backlight) {
1786 backlight_device_unregister(device->backlight);
1787 device->backlight = NULL;
1788 }
1789 if (device->brightness) {
1790 kfree(device->brightness->levels);
1791 kfree(device->brightness);
1792 device->brightness = NULL;
1793 }
1794 if (device->cooling_dev) {
1795 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1796 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1797 thermal_cooling_device_unregister(device->cooling_dev);
1798 device->cooling_dev = NULL;
1799 }
1800 }
1801
1802 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1803 {
1804 struct acpi_video_device *dev;
1805 int error;
1806
1807 if (!video->backlight_registered)
1808 return 0;
1809
1810 error = unregister_pm_notifier(&video->pm_nb);
1811
1812 mutex_lock(&video->device_list_lock);
1813 list_for_each_entry(dev, &video->video_device_list, entry)
1814 acpi_video_dev_unregister_backlight(dev);
1815 mutex_unlock(&video->device_list_lock);
1816
1817 video->backlight_registered = false;
1818
1819 return error;
1820 }
1821
1822 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1823 {
1824 acpi_status status;
1825 struct acpi_device *adev = device->dev;
1826
1827 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1828 acpi_video_device_notify, device);
1829 if (ACPI_FAILURE(status))
1830 dev_err(&adev->dev, "Error installing notify handler\n");
1831 else
1832 device->flags.notify = 1;
1833 }
1834
1835 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1836 {
1837 struct input_dev *input;
1838 struct acpi_video_device *dev;
1839 int error;
1840
1841 video->input = input = input_allocate_device();
1842 if (!input) {
1843 error = -ENOMEM;
1844 goto out;
1845 }
1846
1847 error = acpi_video_bus_start_devices(video);
1848 if (error)
1849 goto err_free_input;
1850
1851 snprintf(video->phys, sizeof(video->phys),
1852 "%s/video/input0", acpi_device_hid(video->device));
1853
1854 input->name = acpi_device_name(video->device);
1855 input->phys = video->phys;
1856 input->id.bustype = BUS_HOST;
1857 input->id.product = 0x06;
1858 input->dev.parent = &video->device->dev;
1859 input->evbit[0] = BIT(EV_KEY);
1860 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1861 set_bit(KEY_VIDEO_NEXT, input->keybit);
1862 set_bit(KEY_VIDEO_PREV, input->keybit);
1863 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1864 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1865 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1866 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1867 set_bit(KEY_DISPLAY_OFF, input->keybit);
1868
1869 error = input_register_device(input);
1870 if (error)
1871 goto err_stop_dev;
1872
1873 mutex_lock(&video->device_list_lock);
1874 list_for_each_entry(dev, &video->video_device_list, entry)
1875 acpi_video_dev_add_notify_handler(dev);
1876 mutex_unlock(&video->device_list_lock);
1877
1878 return 0;
1879
1880 err_stop_dev:
1881 acpi_video_bus_stop_devices(video);
1882 err_free_input:
1883 input_free_device(input);
1884 video->input = NULL;
1885 out:
1886 return error;
1887 }
1888
1889 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1890 {
1891 if (dev->flags.notify) {
1892 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1893 acpi_video_device_notify);
1894 dev->flags.notify = 0;
1895 }
1896 }
1897
1898 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1899 {
1900 struct acpi_video_device *dev;
1901
1902 mutex_lock(&video->device_list_lock);
1903 list_for_each_entry(dev, &video->video_device_list, entry)
1904 acpi_video_dev_remove_notify_handler(dev);
1905 mutex_unlock(&video->device_list_lock);
1906
1907 acpi_video_bus_stop_devices(video);
1908 input_unregister_device(video->input);
1909 video->input = NULL;
1910 }
1911
1912 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1913 {
1914 struct acpi_video_device *dev, *next;
1915
1916 mutex_lock(&video->device_list_lock);
1917 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1918 list_del(&dev->entry);
1919 kfree(dev);
1920 }
1921 mutex_unlock(&video->device_list_lock);
1922
1923 return 0;
1924 }
1925
1926 static int instance;
1927
1928 static int acpi_video_bus_add(struct acpi_device *device)
1929 {
1930 struct acpi_video_bus *video;
1931 int error;
1932 acpi_status status;
1933
1934 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1935 device->parent->handle, 1,
1936 acpi_video_bus_match, NULL,
1937 device, NULL);
1938 if (status == AE_ALREADY_EXISTS) {
1939 printk(KERN_WARNING FW_BUG
1940 "Duplicate ACPI video bus devices for the"
1941 " same VGA controller, please try module "
1942 "parameter \"video.allow_duplicates=1\""
1943 "if the current driver doesn't work.\n");
1944 if (!allow_duplicates)
1945 return -ENODEV;
1946 }
1947
1948 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1949 if (!video)
1950 return -ENOMEM;
1951
1952 /* a hack to fix the duplicate name "VID" problem on T61 */
1953 if (!strcmp(device->pnp.bus_id, "VID")) {
1954 if (instance)
1955 device->pnp.bus_id[3] = '0' + instance;
1956 instance++;
1957 }
1958 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1959 if (!strcmp(device->pnp.bus_id, "VGA")) {
1960 if (instance)
1961 device->pnp.bus_id[3] = '0' + instance;
1962 instance++;
1963 }
1964
1965 video->device = device;
1966 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1967 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1968 device->driver_data = video;
1969
1970 acpi_video_bus_find_cap(video);
1971 error = acpi_video_bus_check(video);
1972 if (error)
1973 goto err_free_video;
1974
1975 mutex_init(&video->device_list_lock);
1976 INIT_LIST_HEAD(&video->video_device_list);
1977
1978 error = acpi_video_bus_get_devices(video, device);
1979 if (error)
1980 goto err_put_video;
1981
1982 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
1983 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1984 video->flags.multihead ? "yes" : "no",
1985 video->flags.rom ? "yes" : "no",
1986 video->flags.post ? "yes" : "no");
1987 mutex_lock(&video_list_lock);
1988 list_add_tail(&video->entry, &video_bus_head);
1989 mutex_unlock(&video_list_lock);
1990
1991 acpi_video_bus_register_backlight(video);
1992 acpi_video_bus_add_notify_handler(video);
1993
1994 return 0;
1995
1996 err_put_video:
1997 acpi_video_bus_put_devices(video);
1998 kfree(video->attached_array);
1999 err_free_video:
2000 kfree(video);
2001 device->driver_data = NULL;
2002
2003 return error;
2004 }
2005
2006 static int acpi_video_bus_remove(struct acpi_device *device)
2007 {
2008 struct acpi_video_bus *video = NULL;
2009
2010
2011 if (!device || !acpi_driver_data(device))
2012 return -EINVAL;
2013
2014 video = acpi_driver_data(device);
2015
2016 acpi_video_bus_remove_notify_handler(video);
2017 acpi_video_bus_unregister_backlight(video);
2018 acpi_video_bus_put_devices(video);
2019
2020 mutex_lock(&video_list_lock);
2021 list_del(&video->entry);
2022 mutex_unlock(&video_list_lock);
2023
2024 kfree(video->attached_array);
2025 kfree(video);
2026
2027 return 0;
2028 }
2029
2030 static int __init is_i740(struct pci_dev *dev)
2031 {
2032 if (dev->device == 0x00D1)
2033 return 1;
2034 if (dev->device == 0x7000)
2035 return 1;
2036 return 0;
2037 }
2038
2039 static int __init intel_opregion_present(void)
2040 {
2041 int opregion = 0;
2042 struct pci_dev *dev = NULL;
2043 u32 address;
2044
2045 for_each_pci_dev(dev) {
2046 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2047 continue;
2048 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2049 continue;
2050 /* We don't want to poke around undefined i740 registers */
2051 if (is_i740(dev))
2052 continue;
2053 pci_read_config_dword(dev, 0xfc, &address);
2054 if (!address)
2055 continue;
2056 opregion = 1;
2057 }
2058 return opregion;
2059 }
2060
2061 int acpi_video_register(void)
2062 {
2063 int ret = 0;
2064
2065 mutex_lock(&register_count_mutex);
2066 if (register_count) {
2067 /*
2068 * if the function of acpi_video_register is already called,
2069 * don't register the acpi_vide_bus again and return no error.
2070 */
2071 goto leave;
2072 }
2073
2074 dmi_check_system(video_dmi_table);
2075
2076 ret = acpi_bus_register_driver(&acpi_video_bus);
2077 if (ret)
2078 goto leave;
2079
2080 /*
2081 * When the acpi_video_bus is loaded successfully, increase
2082 * the counter reference.
2083 */
2084 register_count = 1;
2085
2086 leave:
2087 mutex_unlock(&register_count_mutex);
2088 return ret;
2089 }
2090 EXPORT_SYMBOL(acpi_video_register);
2091
2092 void acpi_video_unregister(void)
2093 {
2094 mutex_lock(&register_count_mutex);
2095 if (register_count) {
2096 acpi_bus_unregister_driver(&acpi_video_bus);
2097 register_count = 0;
2098 }
2099 mutex_unlock(&register_count_mutex);
2100 }
2101 EXPORT_SYMBOL(acpi_video_unregister);
2102
2103 void acpi_video_unregister_backlight(void)
2104 {
2105 struct acpi_video_bus *video;
2106
2107 mutex_lock(&register_count_mutex);
2108 if (register_count) {
2109 mutex_lock(&video_list_lock);
2110 list_for_each_entry(video, &video_bus_head, entry)
2111 acpi_video_bus_unregister_backlight(video);
2112 mutex_unlock(&video_list_lock);
2113 }
2114 mutex_unlock(&register_count_mutex);
2115 }
2116
2117 bool acpi_video_handles_brightness_key_presses(void)
2118 {
2119 bool have_video_busses;
2120
2121 mutex_lock(&video_list_lock);
2122 have_video_busses = !list_empty(&video_bus_head);
2123 mutex_unlock(&video_list_lock);
2124
2125 return have_video_busses &&
2126 (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS);
2127 }
2128 EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses);
2129
2130 /*
2131 * This is kind of nasty. Hardware using Intel chipsets may require
2132 * the video opregion code to be run first in order to initialise
2133 * state before any ACPI video calls are made. To handle this we defer
2134 * registration of the video class until the opregion code has run.
2135 */
2136
2137 static int __init acpi_video_init(void)
2138 {
2139 /*
2140 * Let the module load even if ACPI is disabled (e.g. due to
2141 * a broken BIOS) so that i915.ko can still be loaded on such
2142 * old systems without an AcpiOpRegion.
2143 *
2144 * acpi_video_register() will report -ENODEV later as well due
2145 * to acpi_disabled when i915.ko tries to register itself afterwards.
2146 */
2147 if (acpi_disabled)
2148 return 0;
2149
2150 if (intel_opregion_present())
2151 return 0;
2152
2153 return acpi_video_register();
2154 }
2155
2156 static void __exit acpi_video_exit(void)
2157 {
2158 acpi_video_detect_exit();
2159 acpi_video_unregister();
2160
2161 return;
2162 }
2163
2164 module_init(acpi_video_init);
2165 module_exit(acpi_video_exit);
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