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Merge branch 'for-4.7/core' of git://git.kernel.dk/linux-block
[deliverable/linux.git] / drivers / acpi / acpi_video.c
1 /*
2 * video.c - ACPI Video Driver
3 *
4 * Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
5 * Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
6 * Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
7 *
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or (at
13 * your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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 #define REPORT_OUTPUT_KEY_EVENTS 0x01
81 #define REPORT_BRIGHTNESS_KEY_EVENTS 0x02
82 static int report_key_events = -1;
83 module_param(report_key_events, int, 0644);
84 MODULE_PARM_DESC(report_key_events,
85 "0: none, 1: output changes, 2: brightness changes, 3: all");
86
87 static bool device_id_scheme = false;
88 module_param(device_id_scheme, bool, 0444);
89
90 static bool only_lcd = false;
91 module_param(only_lcd, bool, 0444);
92
93 static int register_count;
94 static DEFINE_MUTEX(register_count_mutex);
95 static DEFINE_MUTEX(video_list_lock);
96 static LIST_HEAD(video_bus_head);
97 static int acpi_video_bus_add(struct acpi_device *device);
98 static int acpi_video_bus_remove(struct acpi_device *device);
99 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
100 void acpi_video_detect_exit(void);
101
102 static const struct acpi_device_id video_device_ids[] = {
103 {ACPI_VIDEO_HID, 0},
104 {"", 0},
105 };
106 MODULE_DEVICE_TABLE(acpi, video_device_ids);
107
108 static struct acpi_driver acpi_video_bus = {
109 .name = "video",
110 .class = ACPI_VIDEO_CLASS,
111 .ids = video_device_ids,
112 .ops = {
113 .add = acpi_video_bus_add,
114 .remove = acpi_video_bus_remove,
115 .notify = acpi_video_bus_notify,
116 },
117 };
118
119 struct acpi_video_bus_flags {
120 u8 multihead:1; /* can switch video heads */
121 u8 rom:1; /* can retrieve a video rom */
122 u8 post:1; /* can configure the head to */
123 u8 reserved:5;
124 };
125
126 struct acpi_video_bus_cap {
127 u8 _DOS:1; /* Enable/Disable output switching */
128 u8 _DOD:1; /* Enumerate all devices attached to display adapter */
129 u8 _ROM:1; /* Get ROM Data */
130 u8 _GPD:1; /* Get POST Device */
131 u8 _SPD:1; /* Set POST Device */
132 u8 _VPO:1; /* Video POST Options */
133 u8 reserved:2;
134 };
135
136 struct acpi_video_device_attrib {
137 u32 display_index:4; /* A zero-based instance of the Display */
138 u32 display_port_attachment:4; /* This field differentiates the display type */
139 u32 display_type:4; /* Describe the specific type in use */
140 u32 vendor_specific:4; /* Chipset Vendor Specific */
141 u32 bios_can_detect:1; /* BIOS can detect the device */
142 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to
143 the VGA device. */
144 u32 pipe_id:3; /* For VGA multiple-head devices. */
145 u32 reserved:10; /* Must be 0 */
146 u32 device_id_scheme:1; /* Device ID Scheme */
147 };
148
149 struct acpi_video_enumerated_device {
150 union {
151 u32 int_val;
152 struct acpi_video_device_attrib attrib;
153 } value;
154 struct acpi_video_device *bind_info;
155 };
156
157 struct acpi_video_bus {
158 struct acpi_device *device;
159 bool backlight_registered;
160 u8 dos_setting;
161 struct acpi_video_enumerated_device *attached_array;
162 u8 attached_count;
163 u8 child_count;
164 struct acpi_video_bus_cap cap;
165 struct acpi_video_bus_flags flags;
166 struct list_head video_device_list;
167 struct mutex device_list_lock; /* protects video_device_list */
168 struct list_head entry;
169 struct input_dev *input;
170 char phys[32]; /* for input device */
171 struct notifier_block pm_nb;
172 };
173
174 struct acpi_video_device_flags {
175 u8 crt:1;
176 u8 lcd:1;
177 u8 tvout:1;
178 u8 dvi:1;
179 u8 bios:1;
180 u8 unknown:1;
181 u8 notify:1;
182 u8 reserved:1;
183 };
184
185 struct acpi_video_device_cap {
186 u8 _ADR:1; /* Return the unique ID */
187 u8 _BCL:1; /* Query list of brightness control levels supported */
188 u8 _BCM:1; /* Set the brightness level */
189 u8 _BQC:1; /* Get current brightness level */
190 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
191 u8 _DDC:1; /* Return the EDID for this device */
192 };
193
194 struct acpi_video_device {
195 unsigned long device_id;
196 struct acpi_video_device_flags flags;
197 struct acpi_video_device_cap cap;
198 struct list_head entry;
199 struct delayed_work switch_brightness_work;
200 int switch_brightness_event;
201 struct acpi_video_bus *video;
202 struct acpi_device *dev;
203 struct acpi_video_device_brightness *brightness;
204 struct backlight_device *backlight;
205 struct thermal_cooling_device *cooling_dev;
206 };
207
208 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
209 static void acpi_video_device_rebind(struct acpi_video_bus *video);
210 static void acpi_video_device_bind(struct acpi_video_bus *video,
211 struct acpi_video_device *device);
212 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
213 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
214 int level);
215 static int acpi_video_device_lcd_get_level_current(
216 struct acpi_video_device *device,
217 unsigned long long *level, bool raw);
218 static int acpi_video_get_next_level(struct acpi_video_device *device,
219 u32 level_current, u32 event);
220 static void acpi_video_switch_brightness(struct work_struct *work);
221
222 /* backlight device sysfs support */
223 static int acpi_video_get_brightness(struct backlight_device *bd)
224 {
225 unsigned long long cur_level;
226 int i;
227 struct acpi_video_device *vd = bl_get_data(bd);
228
229 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
230 return -EINVAL;
231 for (i = 2; i < vd->brightness->count; i++) {
232 if (vd->brightness->levels[i] == cur_level)
233 /*
234 * The first two entries are special - see page 575
235 * of the ACPI spec 3.0
236 */
237 return i - 2;
238 }
239 return 0;
240 }
241
242 static int acpi_video_set_brightness(struct backlight_device *bd)
243 {
244 int request_level = bd->props.brightness + 2;
245 struct acpi_video_device *vd = bl_get_data(bd);
246
247 cancel_delayed_work(&vd->switch_brightness_work);
248 return acpi_video_device_lcd_set_level(vd,
249 vd->brightness->levels[request_level]);
250 }
251
252 static const struct backlight_ops acpi_backlight_ops = {
253 .get_brightness = acpi_video_get_brightness,
254 .update_status = acpi_video_set_brightness,
255 };
256
257 /* thermal cooling device callbacks */
258 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
259 long *state)
260 {
261 struct acpi_device *device = cooling_dev->devdata;
262 struct acpi_video_device *video = acpi_driver_data(device);
263
264 *state = video->brightness->count - 3;
265 return 0;
266 }
267
268 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
269 long *state)
270 {
271 struct acpi_device *device = cooling_dev->devdata;
272 struct acpi_video_device *video = acpi_driver_data(device);
273 unsigned long long level;
274 int offset;
275
276 if (acpi_video_device_lcd_get_level_current(video, &level, false))
277 return -EINVAL;
278 for (offset = 2; offset < video->brightness->count; offset++)
279 if (level == video->brightness->levels[offset]) {
280 *state = video->brightness->count - offset - 1;
281 return 0;
282 }
283
284 return -EINVAL;
285 }
286
287 static int
288 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
289 {
290 struct acpi_device *device = cooling_dev->devdata;
291 struct acpi_video_device *video = acpi_driver_data(device);
292 int level;
293
294 if (state >= video->brightness->count - 2)
295 return -EINVAL;
296
297 state = video->brightness->count - state;
298 level = video->brightness->levels[state - 1];
299 return acpi_video_device_lcd_set_level(video, level);
300 }
301
302 static const struct thermal_cooling_device_ops video_cooling_ops = {
303 .get_max_state = video_get_max_state,
304 .get_cur_state = video_get_cur_state,
305 .set_cur_state = video_set_cur_state,
306 };
307
308 /*
309 * --------------------------------------------------------------------------
310 * Video Management
311 * --------------------------------------------------------------------------
312 */
313
314 static int
315 acpi_video_device_lcd_query_levels(acpi_handle handle,
316 union acpi_object **levels)
317 {
318 int status;
319 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
320 union acpi_object *obj;
321
322
323 *levels = NULL;
324
325 status = acpi_evaluate_object(handle, "_BCL", NULL, &buffer);
326 if (!ACPI_SUCCESS(status))
327 return status;
328 obj = (union acpi_object *)buffer.pointer;
329 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
330 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
331 status = -EFAULT;
332 goto err;
333 }
334
335 *levels = obj;
336
337 return 0;
338
339 err:
340 kfree(buffer.pointer);
341
342 return status;
343 }
344
345 static int
346 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
347 {
348 int status;
349 int state;
350
351 status = acpi_execute_simple_method(device->dev->handle,
352 "_BCM", level);
353 if (ACPI_FAILURE(status)) {
354 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
355 return -EIO;
356 }
357
358 device->brightness->curr = level;
359 for (state = 2; state < device->brightness->count; state++)
360 if (level == device->brightness->levels[state]) {
361 if (device->backlight)
362 device->backlight->props.brightness = state - 2;
363 return 0;
364 }
365
366 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
367 return -EINVAL;
368 }
369
370 /*
371 * For some buggy _BQC methods, we need to add a constant value to
372 * the _BQC return value to get the actual current brightness level
373 */
374
375 static int bqc_offset_aml_bug_workaround;
376 static int video_set_bqc_offset(const struct dmi_system_id *d)
377 {
378 bqc_offset_aml_bug_workaround = 9;
379 return 0;
380 }
381
382 static int video_disable_backlight_sysfs_if(
383 const struct dmi_system_id *d)
384 {
385 if (disable_backlight_sysfs_if == -1)
386 disable_backlight_sysfs_if = 1;
387 return 0;
388 }
389
390 static int video_set_device_id_scheme(const struct dmi_system_id *d)
391 {
392 device_id_scheme = true;
393 return 0;
394 }
395
396 static int video_enable_only_lcd(const struct dmi_system_id *d)
397 {
398 only_lcd = true;
399 return 0;
400 }
401
402 static int video_set_report_key_events(const struct dmi_system_id *id)
403 {
404 if (report_key_events == -1)
405 report_key_events = (uintptr_t)id->driver_data;
406 return 0;
407 }
408
409 static struct dmi_system_id video_dmi_table[] = {
410 /*
411 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
412 */
413 {
414 .callback = video_set_bqc_offset,
415 .ident = "Acer Aspire 5720",
416 .matches = {
417 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
418 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
419 },
420 },
421 {
422 .callback = video_set_bqc_offset,
423 .ident = "Acer Aspire 5710Z",
424 .matches = {
425 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
426 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
427 },
428 },
429 {
430 .callback = video_set_bqc_offset,
431 .ident = "eMachines E510",
432 .matches = {
433 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
434 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
435 },
436 },
437 {
438 .callback = video_set_bqc_offset,
439 .ident = "Acer Aspire 5315",
440 .matches = {
441 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
442 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
443 },
444 },
445 {
446 .callback = video_set_bqc_offset,
447 .ident = "Acer Aspire 7720",
448 .matches = {
449 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
450 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
451 },
452 },
453
454 /*
455 * Some machines have a broken acpi-video interface for brightness
456 * control, but still need an acpi_video_device_lcd_set_level() call
457 * on resume to turn the backlight power on. We Enable backlight
458 * control on these systems, but do not register a backlight sysfs
459 * as brightness control does not work.
460 */
461 {
462 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
463 .callback = video_disable_backlight_sysfs_if,
464 .ident = "Toshiba Portege R700",
465 .matches = {
466 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
467 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"),
468 },
469 },
470 {
471 /* https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
472 .callback = video_disable_backlight_sysfs_if,
473 .ident = "Toshiba Portege R830",
474 .matches = {
475 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
476 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R830"),
477 },
478 },
479 {
480 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
481 .callback = video_disable_backlight_sysfs_if,
482 .ident = "Toshiba Satellite R830",
483 .matches = {
484 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
485 DMI_MATCH(DMI_PRODUCT_NAME, "SATELLITE R830"),
486 },
487 },
488 /*
489 * Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set
490 * but the IDs actually follow the Device ID Scheme.
491 */
492 {
493 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
494 .callback = video_set_device_id_scheme,
495 .ident = "ESPRIMO Mobile M9410",
496 .matches = {
497 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
498 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
499 },
500 },
501 /*
502 * Some machines have multiple video output devices, but only the one
503 * that is the type of LCD can do the backlight control so we should not
504 * register backlight interface for other video output devices.
505 */
506 {
507 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
508 .callback = video_enable_only_lcd,
509 .ident = "ESPRIMO Mobile M9410",
510 .matches = {
511 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
512 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
513 },
514 },
515 /*
516 * Some machines report wrong key events on the acpi-bus, suppress
517 * key event reporting on these. Note this is only intended to work
518 * around events which are plain wrong. In some cases we get double
519 * events, in this case acpi-video is considered the canonical source
520 * and the events from the other source should be filtered. E.g.
521 * by calling acpi_video_handles_brightness_key_presses() from the
522 * vendor acpi/wmi driver or by using /lib/udev/hwdb.d/60-keyboard.hwdb
523 */
524 {
525 .callback = video_set_report_key_events,
526 .driver_data = (void *)((uintptr_t)REPORT_OUTPUT_KEY_EVENTS),
527 .ident = "Dell Vostro V131",
528 .matches = {
529 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
530 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
531 },
532 },
533 {}
534 };
535
536 static unsigned long long
537 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
538 unsigned long long bqc_value)
539 {
540 unsigned long long level;
541
542 if (device->brightness->flags._BQC_use_index) {
543 /*
544 * _BQC returns an index that doesn't account for
545 * the first 2 items with special meaning, so we need
546 * to compensate for that by offsetting ourselves
547 */
548 if (device->brightness->flags._BCL_reversed)
549 bqc_value = device->brightness->count - 3 - bqc_value;
550
551 level = device->brightness->levels[bqc_value + 2];
552 } else {
553 level = bqc_value;
554 }
555
556 level += bqc_offset_aml_bug_workaround;
557
558 return level;
559 }
560
561 static int
562 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
563 unsigned long long *level, bool raw)
564 {
565 acpi_status status = AE_OK;
566 int i;
567
568 if (device->cap._BQC || device->cap._BCQ) {
569 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
570
571 status = acpi_evaluate_integer(device->dev->handle, buf,
572 NULL, level);
573 if (ACPI_SUCCESS(status)) {
574 if (raw) {
575 /*
576 * Caller has indicated he wants the raw
577 * value returned by _BQC, so don't furtherly
578 * mess with the value.
579 */
580 return 0;
581 }
582
583 *level = acpi_video_bqc_value_to_level(device, *level);
584
585 for (i = 2; i < device->brightness->count; i++)
586 if (device->brightness->levels[i] == *level) {
587 device->brightness->curr = *level;
588 return 0;
589 }
590 /*
591 * BQC returned an invalid level.
592 * Stop using it.
593 */
594 ACPI_WARNING((AE_INFO,
595 "%s returned an invalid level",
596 buf));
597 device->cap._BQC = device->cap._BCQ = 0;
598 } else {
599 /*
600 * Fixme:
601 * should we return an error or ignore this failure?
602 * dev->brightness->curr is a cached value which stores
603 * the correct current backlight level in most cases.
604 * ACPI video backlight still works w/ buggy _BQC.
605 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
606 */
607 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
608 device->cap._BQC = device->cap._BCQ = 0;
609 }
610 }
611
612 *level = device->brightness->curr;
613 return 0;
614 }
615
616 static int
617 acpi_video_device_EDID(struct acpi_video_device *device,
618 union acpi_object **edid, ssize_t length)
619 {
620 int status;
621 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
622 union acpi_object *obj;
623 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
624 struct acpi_object_list args = { 1, &arg0 };
625
626
627 *edid = NULL;
628
629 if (!device)
630 return -ENODEV;
631 if (length == 128)
632 arg0.integer.value = 1;
633 else if (length == 256)
634 arg0.integer.value = 2;
635 else
636 return -EINVAL;
637
638 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
639 if (ACPI_FAILURE(status))
640 return -ENODEV;
641
642 obj = buffer.pointer;
643
644 if (obj && obj->type == ACPI_TYPE_BUFFER)
645 *edid = obj;
646 else {
647 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
648 status = -EFAULT;
649 kfree(obj);
650 }
651
652 return status;
653 }
654
655 /* bus */
656
657 /*
658 * Arg:
659 * video : video bus device pointer
660 * bios_flag :
661 * 0. The system BIOS should NOT automatically switch(toggle)
662 * the active display output.
663 * 1. The system BIOS should automatically switch (toggle) the
664 * active display output. No switch event.
665 * 2. The _DGS value should be locked.
666 * 3. The system BIOS should not automatically switch (toggle) the
667 * active display output, but instead generate the display switch
668 * event notify code.
669 * lcd_flag :
670 * 0. The system BIOS should automatically control the brightness level
671 * of the LCD when the power changes from AC to DC
672 * 1. The system BIOS should NOT automatically control the brightness
673 * level of the LCD when the power changes from AC to DC.
674 * Return Value:
675 * -EINVAL wrong arg.
676 */
677
678 static int
679 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
680 {
681 acpi_status status;
682
683 if (!video->cap._DOS)
684 return 0;
685
686 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
687 return -EINVAL;
688 video->dos_setting = (lcd_flag << 2) | bios_flag;
689 status = acpi_execute_simple_method(video->device->handle, "_DOS",
690 (lcd_flag << 2) | bios_flag);
691 if (ACPI_FAILURE(status))
692 return -EIO;
693
694 return 0;
695 }
696
697 /*
698 * Simple comparison function used to sort backlight levels.
699 */
700
701 static int
702 acpi_video_cmp_level(const void *a, const void *b)
703 {
704 return *(int *)a - *(int *)b;
705 }
706
707 /*
708 * Decides if _BQC/_BCQ for this system is usable
709 *
710 * We do this by changing the level first and then read out the current
711 * brightness level, if the value does not match, find out if it is using
712 * index. If not, clear the _BQC/_BCQ capability.
713 */
714 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
715 int max_level, int current_level)
716 {
717 struct acpi_video_device_brightness *br = device->brightness;
718 int result;
719 unsigned long long level;
720 int test_level;
721
722 /* don't mess with existing known broken systems */
723 if (bqc_offset_aml_bug_workaround)
724 return 0;
725
726 /*
727 * Some systems always report current brightness level as maximum
728 * through _BQC, we need to test another value for them.
729 */
730 test_level = current_level == max_level ? br->levels[3] : max_level;
731
732 result = acpi_video_device_lcd_set_level(device, test_level);
733 if (result)
734 return result;
735
736 result = acpi_video_device_lcd_get_level_current(device, &level, true);
737 if (result)
738 return result;
739
740 if (level != test_level) {
741 /* buggy _BQC found, need to find out if it uses index */
742 if (level < br->count) {
743 if (br->flags._BCL_reversed)
744 level = br->count - 3 - level;
745 if (br->levels[level + 2] == test_level)
746 br->flags._BQC_use_index = 1;
747 }
748
749 if (!br->flags._BQC_use_index)
750 device->cap._BQC = device->cap._BCQ = 0;
751 }
752
753 return 0;
754 }
755
756 int acpi_video_get_levels(struct acpi_device *device,
757 struct acpi_video_device_brightness **dev_br)
758 {
759 union acpi_object *obj = NULL;
760 int i, max_level = 0, count = 0, level_ac_battery = 0;
761 union acpi_object *o;
762 struct acpi_video_device_brightness *br = NULL;
763 int result = 0;
764 u32 value;
765
766 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device->handle,
767 &obj))) {
768 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
769 "LCD brightness level\n"));
770 result = -ENODEV;
771 goto out;
772 }
773
774 if (obj->package.count < 2) {
775 result = -EINVAL;
776 goto out;
777 }
778
779 br = kzalloc(sizeof(*br), GFP_KERNEL);
780 if (!br) {
781 printk(KERN_ERR "can't allocate memory\n");
782 result = -ENOMEM;
783 goto out;
784 }
785
786 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
787 GFP_KERNEL);
788 if (!br->levels) {
789 result = -ENOMEM;
790 goto out_free;
791 }
792
793 for (i = 0; i < obj->package.count; i++) {
794 o = (union acpi_object *)&obj->package.elements[i];
795 if (o->type != ACPI_TYPE_INTEGER) {
796 printk(KERN_ERR PREFIX "Invalid data\n");
797 continue;
798 }
799 value = (u32) o->integer.value;
800 /* Skip duplicate entries */
801 if (count > 2 && br->levels[count - 1] == value)
802 continue;
803
804 br->levels[count] = value;
805
806 if (br->levels[count] > max_level)
807 max_level = br->levels[count];
808 count++;
809 }
810
811 /*
812 * some buggy BIOS don't export the levels
813 * when machine is on AC/Battery in _BCL package.
814 * In this case, the first two elements in _BCL packages
815 * are also supported brightness levels that OS should take care of.
816 */
817 for (i = 2; i < count; i++) {
818 if (br->levels[i] == br->levels[0])
819 level_ac_battery++;
820 if (br->levels[i] == br->levels[1])
821 level_ac_battery++;
822 }
823
824 if (level_ac_battery < 2) {
825 level_ac_battery = 2 - level_ac_battery;
826 br->flags._BCL_no_ac_battery_levels = 1;
827 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
828 br->levels[i] = br->levels[i - level_ac_battery];
829 count += level_ac_battery;
830 } else if (level_ac_battery > 2)
831 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
832
833 /* Check if the _BCL package is in a reversed order */
834 if (max_level == br->levels[2]) {
835 br->flags._BCL_reversed = 1;
836 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
837 acpi_video_cmp_level, NULL);
838 } else if (max_level != br->levels[count - 1])
839 ACPI_ERROR((AE_INFO,
840 "Found unordered _BCL package"));
841
842 br->count = count;
843 *dev_br = br;
844
845 out:
846 kfree(obj);
847 return result;
848 out_free:
849 kfree(br);
850 goto out;
851 }
852 EXPORT_SYMBOL(acpi_video_get_levels);
853
854 /*
855 * Arg:
856 * device : video output device (LCD, CRT, ..)
857 *
858 * Return Value:
859 * Maximum brightness level
860 *
861 * Allocate and initialize device->brightness.
862 */
863
864 static int
865 acpi_video_init_brightness(struct acpi_video_device *device)
866 {
867 int i, max_level = 0;
868 unsigned long long level, level_old;
869 struct acpi_video_device_brightness *br = NULL;
870 int result = -EINVAL;
871
872 result = acpi_video_get_levels(device->dev, &br);
873 if (result)
874 return result;
875 device->brightness = br;
876
877 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
878 br->curr = level = max_level;
879
880 if (!device->cap._BQC)
881 goto set_level;
882
883 result = acpi_video_device_lcd_get_level_current(device,
884 &level_old, true);
885 if (result)
886 goto out_free_levels;
887
888 result = acpi_video_bqc_quirk(device, max_level, level_old);
889 if (result)
890 goto out_free_levels;
891 /*
892 * cap._BQC may get cleared due to _BQC is found to be broken
893 * in acpi_video_bqc_quirk, so check again here.
894 */
895 if (!device->cap._BQC)
896 goto set_level;
897
898 level = acpi_video_bqc_value_to_level(device, level_old);
899 /*
900 * On some buggy laptops, _BQC returns an uninitialized
901 * value when invoked for the first time, i.e.
902 * level_old is invalid (no matter whether it's a level
903 * or an index). Set the backlight to max_level in this case.
904 */
905 for (i = 2; i < br->count; i++)
906 if (level == br->levels[i])
907 break;
908 if (i == br->count || !level)
909 level = max_level;
910
911 set_level:
912 result = acpi_video_device_lcd_set_level(device, level);
913 if (result)
914 goto out_free_levels;
915
916 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
917 "found %d brightness levels\n", br->count - 2));
918 return 0;
919
920 out_free_levels:
921 kfree(br->levels);
922 kfree(br);
923 device->brightness = NULL;
924 return result;
925 }
926
927 /*
928 * Arg:
929 * device : video output device (LCD, CRT, ..)
930 *
931 * Return Value:
932 * None
933 *
934 * Find out all required AML methods defined under the output
935 * device.
936 */
937
938 static void acpi_video_device_find_cap(struct acpi_video_device *device)
939 {
940 if (acpi_has_method(device->dev->handle, "_ADR"))
941 device->cap._ADR = 1;
942 if (acpi_has_method(device->dev->handle, "_BCL"))
943 device->cap._BCL = 1;
944 if (acpi_has_method(device->dev->handle, "_BCM"))
945 device->cap._BCM = 1;
946 if (acpi_has_method(device->dev->handle, "_BQC")) {
947 device->cap._BQC = 1;
948 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
949 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
950 device->cap._BCQ = 1;
951 }
952
953 if (acpi_has_method(device->dev->handle, "_DDC"))
954 device->cap._DDC = 1;
955 }
956
957 /*
958 * Arg:
959 * device : video output device (VGA)
960 *
961 * Return Value:
962 * None
963 *
964 * Find out all required AML methods defined under the video bus device.
965 */
966
967 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
968 {
969 if (acpi_has_method(video->device->handle, "_DOS"))
970 video->cap._DOS = 1;
971 if (acpi_has_method(video->device->handle, "_DOD"))
972 video->cap._DOD = 1;
973 if (acpi_has_method(video->device->handle, "_ROM"))
974 video->cap._ROM = 1;
975 if (acpi_has_method(video->device->handle, "_GPD"))
976 video->cap._GPD = 1;
977 if (acpi_has_method(video->device->handle, "_SPD"))
978 video->cap._SPD = 1;
979 if (acpi_has_method(video->device->handle, "_VPO"))
980 video->cap._VPO = 1;
981 }
982
983 /*
984 * Check whether the video bus device has required AML method to
985 * support the desired features
986 */
987
988 static int acpi_video_bus_check(struct acpi_video_bus *video)
989 {
990 acpi_status status = -ENOENT;
991 struct pci_dev *dev;
992
993 if (!video)
994 return -EINVAL;
995
996 dev = acpi_get_pci_dev(video->device->handle);
997 if (!dev)
998 return -ENODEV;
999 pci_dev_put(dev);
1000
1001 /*
1002 * Since there is no HID, CID and so on for VGA driver, we have
1003 * to check well known required nodes.
1004 */
1005
1006 /* Does this device support video switching? */
1007 if (video->cap._DOS || video->cap._DOD) {
1008 if (!video->cap._DOS) {
1009 printk(KERN_WARNING FW_BUG
1010 "ACPI(%s) defines _DOD but not _DOS\n",
1011 acpi_device_bid(video->device));
1012 }
1013 video->flags.multihead = 1;
1014 status = 0;
1015 }
1016
1017 /* Does this device support retrieving a video ROM? */
1018 if (video->cap._ROM) {
1019 video->flags.rom = 1;
1020 status = 0;
1021 }
1022
1023 /* Does this device support configuring which video device to POST? */
1024 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1025 video->flags.post = 1;
1026 status = 0;
1027 }
1028
1029 return status;
1030 }
1031
1032 /*
1033 * --------------------------------------------------------------------------
1034 * Driver Interface
1035 * --------------------------------------------------------------------------
1036 */
1037
1038 /* device interface */
1039 static struct acpi_video_device_attrib *
1040 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1041 {
1042 struct acpi_video_enumerated_device *ids;
1043 int i;
1044
1045 for (i = 0; i < video->attached_count; i++) {
1046 ids = &video->attached_array[i];
1047 if ((ids->value.int_val & 0xffff) == device_id)
1048 return &ids->value.attrib;
1049 }
1050
1051 return NULL;
1052 }
1053
1054 static int
1055 acpi_video_get_device_type(struct acpi_video_bus *video,
1056 unsigned long device_id)
1057 {
1058 struct acpi_video_enumerated_device *ids;
1059 int i;
1060
1061 for (i = 0; i < video->attached_count; i++) {
1062 ids = &video->attached_array[i];
1063 if ((ids->value.int_val & 0xffff) == device_id)
1064 return ids->value.int_val;
1065 }
1066
1067 return 0;
1068 }
1069
1070 static int
1071 acpi_video_bus_get_one_device(struct acpi_device *device,
1072 struct acpi_video_bus *video)
1073 {
1074 unsigned long long device_id;
1075 int status, device_type;
1076 struct acpi_video_device *data;
1077 struct acpi_video_device_attrib *attribute;
1078
1079 status =
1080 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1081 /* Some device omits _ADR, we skip them instead of fail */
1082 if (ACPI_FAILURE(status))
1083 return 0;
1084
1085 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1086 if (!data)
1087 return -ENOMEM;
1088
1089 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1090 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1091 device->driver_data = data;
1092
1093 data->device_id = device_id;
1094 data->video = video;
1095 data->dev = device;
1096 INIT_DELAYED_WORK(&data->switch_brightness_work,
1097 acpi_video_switch_brightness);
1098
1099 attribute = acpi_video_get_device_attr(video, device_id);
1100
1101 if (attribute && (attribute->device_id_scheme || device_id_scheme)) {
1102 switch (attribute->display_type) {
1103 case ACPI_VIDEO_DISPLAY_CRT:
1104 data->flags.crt = 1;
1105 break;
1106 case ACPI_VIDEO_DISPLAY_TV:
1107 data->flags.tvout = 1;
1108 break;
1109 case ACPI_VIDEO_DISPLAY_DVI:
1110 data->flags.dvi = 1;
1111 break;
1112 case ACPI_VIDEO_DISPLAY_LCD:
1113 data->flags.lcd = 1;
1114 break;
1115 default:
1116 data->flags.unknown = 1;
1117 break;
1118 }
1119 if (attribute->bios_can_detect)
1120 data->flags.bios = 1;
1121 } else {
1122 /* Check for legacy IDs */
1123 device_type = acpi_video_get_device_type(video, device_id);
1124 /* Ignore bits 16 and 18-20 */
1125 switch (device_type & 0xffe2ffff) {
1126 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1127 data->flags.crt = 1;
1128 break;
1129 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1130 data->flags.lcd = 1;
1131 break;
1132 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1133 data->flags.tvout = 1;
1134 break;
1135 default:
1136 data->flags.unknown = 1;
1137 }
1138 }
1139
1140 acpi_video_device_bind(video, data);
1141 acpi_video_device_find_cap(data);
1142
1143 mutex_lock(&video->device_list_lock);
1144 list_add_tail(&data->entry, &video->video_device_list);
1145 mutex_unlock(&video->device_list_lock);
1146
1147 return status;
1148 }
1149
1150 /*
1151 * Arg:
1152 * video : video bus device
1153 *
1154 * Return:
1155 * none
1156 *
1157 * Enumerate the video device list of the video bus,
1158 * bind the ids with the corresponding video devices
1159 * under the video bus.
1160 */
1161
1162 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1163 {
1164 struct acpi_video_device *dev;
1165
1166 mutex_lock(&video->device_list_lock);
1167
1168 list_for_each_entry(dev, &video->video_device_list, entry)
1169 acpi_video_device_bind(video, dev);
1170
1171 mutex_unlock(&video->device_list_lock);
1172 }
1173
1174 /*
1175 * Arg:
1176 * video : video bus device
1177 * device : video output device under the video
1178 * bus
1179 *
1180 * Return:
1181 * none
1182 *
1183 * Bind the ids with the corresponding video devices
1184 * under the video bus.
1185 */
1186
1187 static void
1188 acpi_video_device_bind(struct acpi_video_bus *video,
1189 struct acpi_video_device *device)
1190 {
1191 struct acpi_video_enumerated_device *ids;
1192 int i;
1193
1194 for (i = 0; i < video->attached_count; i++) {
1195 ids = &video->attached_array[i];
1196 if (device->device_id == (ids->value.int_val & 0xffff)) {
1197 ids->bind_info = device;
1198 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1199 }
1200 }
1201 }
1202
1203 static bool acpi_video_device_in_dod(struct acpi_video_device *device)
1204 {
1205 struct acpi_video_bus *video = device->video;
1206 int i;
1207
1208 /*
1209 * If we have a broken _DOD or we have more than 8 output devices
1210 * under the graphics controller node that we can't proper deal with
1211 * in the operation region code currently, no need to test.
1212 */
1213 if (!video->attached_count || video->child_count > 8)
1214 return true;
1215
1216 for (i = 0; i < video->attached_count; i++) {
1217 if ((video->attached_array[i].value.int_val & 0xfff) ==
1218 (device->device_id & 0xfff))
1219 return true;
1220 }
1221
1222 return false;
1223 }
1224
1225 /*
1226 * Arg:
1227 * video : video bus device
1228 *
1229 * Return:
1230 * < 0 : error
1231 *
1232 * Call _DOD to enumerate all devices attached to display adapter
1233 *
1234 */
1235
1236 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1237 {
1238 int status;
1239 int count;
1240 int i;
1241 struct acpi_video_enumerated_device *active_list;
1242 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1243 union acpi_object *dod = NULL;
1244 union acpi_object *obj;
1245
1246 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1247 if (!ACPI_SUCCESS(status)) {
1248 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1249 return status;
1250 }
1251
1252 dod = buffer.pointer;
1253 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1254 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1255 status = -EFAULT;
1256 goto out;
1257 }
1258
1259 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1260 dod->package.count));
1261
1262 active_list = kcalloc(1 + dod->package.count,
1263 sizeof(struct acpi_video_enumerated_device),
1264 GFP_KERNEL);
1265 if (!active_list) {
1266 status = -ENOMEM;
1267 goto out;
1268 }
1269
1270 count = 0;
1271 for (i = 0; i < dod->package.count; i++) {
1272 obj = &dod->package.elements[i];
1273
1274 if (obj->type != ACPI_TYPE_INTEGER) {
1275 printk(KERN_ERR PREFIX
1276 "Invalid _DOD data in element %d\n", i);
1277 continue;
1278 }
1279
1280 active_list[count].value.int_val = obj->integer.value;
1281 active_list[count].bind_info = NULL;
1282 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1283 (int)obj->integer.value));
1284 count++;
1285 }
1286
1287 kfree(video->attached_array);
1288
1289 video->attached_array = active_list;
1290 video->attached_count = count;
1291
1292 out:
1293 kfree(buffer.pointer);
1294 return status;
1295 }
1296
1297 static int
1298 acpi_video_get_next_level(struct acpi_video_device *device,
1299 u32 level_current, u32 event)
1300 {
1301 int min, max, min_above, max_below, i, l, delta = 255;
1302 max = max_below = 0;
1303 min = min_above = 255;
1304 /* Find closest level to level_current */
1305 for (i = 2; i < device->brightness->count; i++) {
1306 l = device->brightness->levels[i];
1307 if (abs(l - level_current) < abs(delta)) {
1308 delta = l - level_current;
1309 if (!delta)
1310 break;
1311 }
1312 }
1313 /* Ajust level_current to closest available level */
1314 level_current += delta;
1315 for (i = 2; i < device->brightness->count; i++) {
1316 l = device->brightness->levels[i];
1317 if (l < min)
1318 min = l;
1319 if (l > max)
1320 max = l;
1321 if (l < min_above && l > level_current)
1322 min_above = l;
1323 if (l > max_below && l < level_current)
1324 max_below = l;
1325 }
1326
1327 switch (event) {
1328 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1329 return (level_current < max) ? min_above : min;
1330 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1331 return (level_current < max) ? min_above : max;
1332 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1333 return (level_current > min) ? max_below : min;
1334 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1335 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1336 return 0;
1337 default:
1338 return level_current;
1339 }
1340 }
1341
1342 static void
1343 acpi_video_switch_brightness(struct work_struct *work)
1344 {
1345 struct acpi_video_device *device = container_of(to_delayed_work(work),
1346 struct acpi_video_device, switch_brightness_work);
1347 unsigned long long level_current, level_next;
1348 int event = device->switch_brightness_event;
1349 int result = -EINVAL;
1350
1351 /* no warning message if acpi_backlight=vendor or a quirk is used */
1352 if (!device->backlight)
1353 return;
1354
1355 if (!device->brightness)
1356 goto out;
1357
1358 result = acpi_video_device_lcd_get_level_current(device,
1359 &level_current,
1360 false);
1361 if (result)
1362 goto out;
1363
1364 level_next = acpi_video_get_next_level(device, level_current, event);
1365
1366 result = acpi_video_device_lcd_set_level(device, level_next);
1367
1368 if (!result)
1369 backlight_force_update(device->backlight,
1370 BACKLIGHT_UPDATE_HOTKEY);
1371
1372 out:
1373 if (result)
1374 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1375 }
1376
1377 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1378 void **edid)
1379 {
1380 struct acpi_video_bus *video;
1381 struct acpi_video_device *video_device;
1382 union acpi_object *buffer = NULL;
1383 acpi_status status;
1384 int i, length;
1385
1386 if (!device || !acpi_driver_data(device))
1387 return -EINVAL;
1388
1389 video = acpi_driver_data(device);
1390
1391 for (i = 0; i < video->attached_count; i++) {
1392 video_device = video->attached_array[i].bind_info;
1393 length = 256;
1394
1395 if (!video_device)
1396 continue;
1397
1398 if (!video_device->cap._DDC)
1399 continue;
1400
1401 if (type) {
1402 switch (type) {
1403 case ACPI_VIDEO_DISPLAY_CRT:
1404 if (!video_device->flags.crt)
1405 continue;
1406 break;
1407 case ACPI_VIDEO_DISPLAY_TV:
1408 if (!video_device->flags.tvout)
1409 continue;
1410 break;
1411 case ACPI_VIDEO_DISPLAY_DVI:
1412 if (!video_device->flags.dvi)
1413 continue;
1414 break;
1415 case ACPI_VIDEO_DISPLAY_LCD:
1416 if (!video_device->flags.lcd)
1417 continue;
1418 break;
1419 }
1420 } else if (video_device->device_id != device_id) {
1421 continue;
1422 }
1423
1424 status = acpi_video_device_EDID(video_device, &buffer, length);
1425
1426 if (ACPI_FAILURE(status) || !buffer ||
1427 buffer->type != ACPI_TYPE_BUFFER) {
1428 length = 128;
1429 status = acpi_video_device_EDID(video_device, &buffer,
1430 length);
1431 if (ACPI_FAILURE(status) || !buffer ||
1432 buffer->type != ACPI_TYPE_BUFFER) {
1433 continue;
1434 }
1435 }
1436
1437 *edid = buffer->buffer.pointer;
1438 return length;
1439 }
1440
1441 return -ENODEV;
1442 }
1443 EXPORT_SYMBOL(acpi_video_get_edid);
1444
1445 static int
1446 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1447 struct acpi_device *device)
1448 {
1449 int status = 0;
1450 struct acpi_device *dev;
1451
1452 /*
1453 * There are systems where video module known to work fine regardless
1454 * of broken _DOD and ignoring returned value here doesn't cause
1455 * any issues later.
1456 */
1457 acpi_video_device_enumerate(video);
1458
1459 list_for_each_entry(dev, &device->children, node) {
1460
1461 status = acpi_video_bus_get_one_device(dev, video);
1462 if (status) {
1463 dev_err(&dev->dev, "Can't attach device\n");
1464 break;
1465 }
1466 video->child_count++;
1467 }
1468 return status;
1469 }
1470
1471 /* acpi_video interface */
1472
1473 /*
1474 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1475 * preform any automatic brightness change on receiving a notification.
1476 */
1477 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1478 {
1479 return acpi_video_bus_DOS(video, 0,
1480 acpi_osi_is_win8() ? 1 : 0);
1481 }
1482
1483 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1484 {
1485 return acpi_video_bus_DOS(video, 0,
1486 acpi_osi_is_win8() ? 0 : 1);
1487 }
1488
1489 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1490 {
1491 struct acpi_video_bus *video = acpi_driver_data(device);
1492 struct input_dev *input;
1493 int keycode = 0;
1494
1495 if (!video || !video->input)
1496 return;
1497
1498 input = video->input;
1499
1500 switch (event) {
1501 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1502 * most likely via hotkey. */
1503 keycode = KEY_SWITCHVIDEOMODE;
1504 break;
1505
1506 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1507 * connector. */
1508 acpi_video_device_enumerate(video);
1509 acpi_video_device_rebind(video);
1510 keycode = KEY_SWITCHVIDEOMODE;
1511 break;
1512
1513 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1514 keycode = KEY_SWITCHVIDEOMODE;
1515 break;
1516 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1517 keycode = KEY_VIDEO_NEXT;
1518 break;
1519 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1520 keycode = KEY_VIDEO_PREV;
1521 break;
1522
1523 default:
1524 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1525 "Unsupported event [0x%x]\n", event));
1526 break;
1527 }
1528
1529 if (acpi_notifier_call_chain(device, event, 0))
1530 /* Something vetoed the keypress. */
1531 keycode = 0;
1532
1533 if (keycode && (report_key_events & REPORT_OUTPUT_KEY_EVENTS)) {
1534 input_report_key(input, keycode, 1);
1535 input_sync(input);
1536 input_report_key(input, keycode, 0);
1537 input_sync(input);
1538 }
1539
1540 return;
1541 }
1542
1543 static void brightness_switch_event(struct acpi_video_device *video_device,
1544 u32 event)
1545 {
1546 if (!brightness_switch_enabled)
1547 return;
1548
1549 video_device->switch_brightness_event = event;
1550 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10);
1551 }
1552
1553 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1554 {
1555 struct acpi_video_device *video_device = data;
1556 struct acpi_device *device = NULL;
1557 struct acpi_video_bus *bus;
1558 struct input_dev *input;
1559 int keycode = 0;
1560
1561 if (!video_device)
1562 return;
1563
1564 device = video_device->dev;
1565 bus = video_device->video;
1566 input = bus->input;
1567
1568 switch (event) {
1569 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1570 brightness_switch_event(video_device, event);
1571 keycode = KEY_BRIGHTNESS_CYCLE;
1572 break;
1573 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1574 brightness_switch_event(video_device, event);
1575 keycode = KEY_BRIGHTNESSUP;
1576 break;
1577 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1578 brightness_switch_event(video_device, event);
1579 keycode = KEY_BRIGHTNESSDOWN;
1580 break;
1581 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1582 brightness_switch_event(video_device, event);
1583 keycode = KEY_BRIGHTNESS_ZERO;
1584 break;
1585 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1586 brightness_switch_event(video_device, event);
1587 keycode = KEY_DISPLAY_OFF;
1588 break;
1589 default:
1590 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1591 "Unsupported event [0x%x]\n", event));
1592 break;
1593 }
1594
1595 acpi_notifier_call_chain(device, event, 0);
1596
1597 if (keycode && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS)) {
1598 input_report_key(input, keycode, 1);
1599 input_sync(input);
1600 input_report_key(input, keycode, 0);
1601 input_sync(input);
1602 }
1603
1604 return;
1605 }
1606
1607 static int acpi_video_resume(struct notifier_block *nb,
1608 unsigned long val, void *ign)
1609 {
1610 struct acpi_video_bus *video;
1611 struct acpi_video_device *video_device;
1612 int i;
1613
1614 switch (val) {
1615 case PM_HIBERNATION_PREPARE:
1616 case PM_SUSPEND_PREPARE:
1617 case PM_RESTORE_PREPARE:
1618 return NOTIFY_DONE;
1619 }
1620
1621 video = container_of(nb, struct acpi_video_bus, pm_nb);
1622
1623 dev_info(&video->device->dev, "Restoring backlight state\n");
1624
1625 for (i = 0; i < video->attached_count; i++) {
1626 video_device = video->attached_array[i].bind_info;
1627 if (video_device && video_device->brightness)
1628 acpi_video_device_lcd_set_level(video_device,
1629 video_device->brightness->curr);
1630 }
1631
1632 return NOTIFY_OK;
1633 }
1634
1635 static acpi_status
1636 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1637 void **return_value)
1638 {
1639 struct acpi_device *device = context;
1640 struct acpi_device *sibling;
1641 int result;
1642
1643 if (handle == device->handle)
1644 return AE_CTRL_TERMINATE;
1645
1646 result = acpi_bus_get_device(handle, &sibling);
1647 if (result)
1648 return AE_OK;
1649
1650 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1651 return AE_ALREADY_EXISTS;
1652
1653 return AE_OK;
1654 }
1655
1656 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1657 {
1658 struct backlight_properties props;
1659 struct pci_dev *pdev;
1660 acpi_handle acpi_parent;
1661 struct device *parent = NULL;
1662 int result;
1663 static int count;
1664 char *name;
1665
1666 result = acpi_video_init_brightness(device);
1667 if (result)
1668 return;
1669
1670 if (disable_backlight_sysfs_if > 0)
1671 return;
1672
1673 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1674 if (!name)
1675 return;
1676 count++;
1677
1678 acpi_get_parent(device->dev->handle, &acpi_parent);
1679
1680 pdev = acpi_get_pci_dev(acpi_parent);
1681 if (pdev) {
1682 parent = &pdev->dev;
1683 pci_dev_put(pdev);
1684 }
1685
1686 memset(&props, 0, sizeof(struct backlight_properties));
1687 props.type = BACKLIGHT_FIRMWARE;
1688 props.max_brightness = device->brightness->count - 3;
1689 device->backlight = backlight_device_register(name,
1690 parent,
1691 device,
1692 &acpi_backlight_ops,
1693 &props);
1694 kfree(name);
1695 if (IS_ERR(device->backlight)) {
1696 device->backlight = NULL;
1697 return;
1698 }
1699
1700 /*
1701 * Save current brightness level in case we have to restore it
1702 * before acpi_video_device_lcd_set_level() is called next time.
1703 */
1704 device->backlight->props.brightness =
1705 acpi_video_get_brightness(device->backlight);
1706
1707 device->cooling_dev = thermal_cooling_device_register("LCD",
1708 device->dev, &video_cooling_ops);
1709 if (IS_ERR(device->cooling_dev)) {
1710 /*
1711 * Set cooling_dev to NULL so we don't crash trying to free it.
1712 * Also, why the hell we are returning early and not attempt to
1713 * register video output if cooling device registration failed?
1714 * -- dtor
1715 */
1716 device->cooling_dev = NULL;
1717 return;
1718 }
1719
1720 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1721 device->cooling_dev->id);
1722 result = sysfs_create_link(&device->dev->dev.kobj,
1723 &device->cooling_dev->device.kobj,
1724 "thermal_cooling");
1725 if (result)
1726 printk(KERN_ERR PREFIX "Create sysfs link\n");
1727 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1728 &device->dev->dev.kobj, "device");
1729 if (result)
1730 printk(KERN_ERR PREFIX "Create sysfs link\n");
1731 }
1732
1733 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video)
1734 {
1735 struct acpi_video_device *dev;
1736 union acpi_object *levels;
1737
1738 mutex_lock(&video->device_list_lock);
1739 list_for_each_entry(dev, &video->video_device_list, entry) {
1740 if (!acpi_video_device_lcd_query_levels(dev, &levels))
1741 kfree(levels);
1742 }
1743 mutex_unlock(&video->device_list_lock);
1744 }
1745
1746 static bool acpi_video_should_register_backlight(struct acpi_video_device *dev)
1747 {
1748 /*
1749 * Do not create backlight device for video output
1750 * device that is not in the enumerated list.
1751 */
1752 if (!acpi_video_device_in_dod(dev)) {
1753 dev_dbg(&dev->dev->dev, "not in _DOD list, ignore\n");
1754 return false;
1755 }
1756
1757 if (only_lcd)
1758 return dev->flags.lcd;
1759 return true;
1760 }
1761
1762 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1763 {
1764 struct acpi_video_device *dev;
1765
1766 if (video->backlight_registered)
1767 return 0;
1768
1769 acpi_video_run_bcl_for_osi(video);
1770
1771 if (acpi_video_get_backlight_type() != acpi_backlight_video)
1772 return 0;
1773
1774 mutex_lock(&video->device_list_lock);
1775 list_for_each_entry(dev, &video->video_device_list, entry) {
1776 if (acpi_video_should_register_backlight(dev))
1777 acpi_video_dev_register_backlight(dev);
1778 }
1779 mutex_unlock(&video->device_list_lock);
1780
1781 video->backlight_registered = true;
1782
1783 video->pm_nb.notifier_call = acpi_video_resume;
1784 video->pm_nb.priority = 0;
1785 return register_pm_notifier(&video->pm_nb);
1786 }
1787
1788 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1789 {
1790 if (device->backlight) {
1791 backlight_device_unregister(device->backlight);
1792 device->backlight = NULL;
1793 }
1794 if (device->brightness) {
1795 kfree(device->brightness->levels);
1796 kfree(device->brightness);
1797 device->brightness = NULL;
1798 }
1799 if (device->cooling_dev) {
1800 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1801 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1802 thermal_cooling_device_unregister(device->cooling_dev);
1803 device->cooling_dev = NULL;
1804 }
1805 }
1806
1807 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1808 {
1809 struct acpi_video_device *dev;
1810 int error;
1811
1812 if (!video->backlight_registered)
1813 return 0;
1814
1815 error = unregister_pm_notifier(&video->pm_nb);
1816
1817 mutex_lock(&video->device_list_lock);
1818 list_for_each_entry(dev, &video->video_device_list, entry)
1819 acpi_video_dev_unregister_backlight(dev);
1820 mutex_unlock(&video->device_list_lock);
1821
1822 video->backlight_registered = false;
1823
1824 return error;
1825 }
1826
1827 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1828 {
1829 acpi_status status;
1830 struct acpi_device *adev = device->dev;
1831
1832 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1833 acpi_video_device_notify, device);
1834 if (ACPI_FAILURE(status))
1835 dev_err(&adev->dev, "Error installing notify handler\n");
1836 else
1837 device->flags.notify = 1;
1838 }
1839
1840 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1841 {
1842 struct input_dev *input;
1843 struct acpi_video_device *dev;
1844 int error;
1845
1846 video->input = input = input_allocate_device();
1847 if (!input) {
1848 error = -ENOMEM;
1849 goto out;
1850 }
1851
1852 error = acpi_video_bus_start_devices(video);
1853 if (error)
1854 goto err_free_input;
1855
1856 snprintf(video->phys, sizeof(video->phys),
1857 "%s/video/input0", acpi_device_hid(video->device));
1858
1859 input->name = acpi_device_name(video->device);
1860 input->phys = video->phys;
1861 input->id.bustype = BUS_HOST;
1862 input->id.product = 0x06;
1863 input->dev.parent = &video->device->dev;
1864 input->evbit[0] = BIT(EV_KEY);
1865 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1866 set_bit(KEY_VIDEO_NEXT, input->keybit);
1867 set_bit(KEY_VIDEO_PREV, input->keybit);
1868 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1869 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1870 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1871 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1872 set_bit(KEY_DISPLAY_OFF, input->keybit);
1873
1874 error = input_register_device(input);
1875 if (error)
1876 goto err_stop_dev;
1877
1878 mutex_lock(&video->device_list_lock);
1879 list_for_each_entry(dev, &video->video_device_list, entry)
1880 acpi_video_dev_add_notify_handler(dev);
1881 mutex_unlock(&video->device_list_lock);
1882
1883 return 0;
1884
1885 err_stop_dev:
1886 acpi_video_bus_stop_devices(video);
1887 err_free_input:
1888 input_free_device(input);
1889 video->input = NULL;
1890 out:
1891 return error;
1892 }
1893
1894 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1895 {
1896 if (dev->flags.notify) {
1897 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1898 acpi_video_device_notify);
1899 dev->flags.notify = 0;
1900 }
1901 }
1902
1903 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1904 {
1905 struct acpi_video_device *dev;
1906
1907 mutex_lock(&video->device_list_lock);
1908 list_for_each_entry(dev, &video->video_device_list, entry)
1909 acpi_video_dev_remove_notify_handler(dev);
1910 mutex_unlock(&video->device_list_lock);
1911
1912 acpi_video_bus_stop_devices(video);
1913 input_unregister_device(video->input);
1914 video->input = NULL;
1915 }
1916
1917 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1918 {
1919 struct acpi_video_device *dev, *next;
1920
1921 mutex_lock(&video->device_list_lock);
1922 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1923 list_del(&dev->entry);
1924 kfree(dev);
1925 }
1926 mutex_unlock(&video->device_list_lock);
1927
1928 return 0;
1929 }
1930
1931 static int instance;
1932
1933 static int acpi_video_bus_add(struct acpi_device *device)
1934 {
1935 struct acpi_video_bus *video;
1936 int error;
1937 acpi_status status;
1938
1939 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1940 device->parent->handle, 1,
1941 acpi_video_bus_match, NULL,
1942 device, NULL);
1943 if (status == AE_ALREADY_EXISTS) {
1944 printk(KERN_WARNING FW_BUG
1945 "Duplicate ACPI video bus devices for the"
1946 " same VGA controller, please try module "
1947 "parameter \"video.allow_duplicates=1\""
1948 "if the current driver doesn't work.\n");
1949 if (!allow_duplicates)
1950 return -ENODEV;
1951 }
1952
1953 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1954 if (!video)
1955 return -ENOMEM;
1956
1957 /* a hack to fix the duplicate name "VID" problem on T61 */
1958 if (!strcmp(device->pnp.bus_id, "VID")) {
1959 if (instance)
1960 device->pnp.bus_id[3] = '0' + instance;
1961 instance++;
1962 }
1963 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1964 if (!strcmp(device->pnp.bus_id, "VGA")) {
1965 if (instance)
1966 device->pnp.bus_id[3] = '0' + instance;
1967 instance++;
1968 }
1969
1970 video->device = device;
1971 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1972 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1973 device->driver_data = video;
1974
1975 acpi_video_bus_find_cap(video);
1976 error = acpi_video_bus_check(video);
1977 if (error)
1978 goto err_free_video;
1979
1980 mutex_init(&video->device_list_lock);
1981 INIT_LIST_HEAD(&video->video_device_list);
1982
1983 error = acpi_video_bus_get_devices(video, device);
1984 if (error)
1985 goto err_put_video;
1986
1987 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
1988 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1989 video->flags.multihead ? "yes" : "no",
1990 video->flags.rom ? "yes" : "no",
1991 video->flags.post ? "yes" : "no");
1992 mutex_lock(&video_list_lock);
1993 list_add_tail(&video->entry, &video_bus_head);
1994 mutex_unlock(&video_list_lock);
1995
1996 acpi_video_bus_register_backlight(video);
1997 acpi_video_bus_add_notify_handler(video);
1998
1999 return 0;
2000
2001 err_put_video:
2002 acpi_video_bus_put_devices(video);
2003 kfree(video->attached_array);
2004 err_free_video:
2005 kfree(video);
2006 device->driver_data = NULL;
2007
2008 return error;
2009 }
2010
2011 static int acpi_video_bus_remove(struct acpi_device *device)
2012 {
2013 struct acpi_video_bus *video = NULL;
2014
2015
2016 if (!device || !acpi_driver_data(device))
2017 return -EINVAL;
2018
2019 video = acpi_driver_data(device);
2020
2021 acpi_video_bus_remove_notify_handler(video);
2022 acpi_video_bus_unregister_backlight(video);
2023 acpi_video_bus_put_devices(video);
2024
2025 mutex_lock(&video_list_lock);
2026 list_del(&video->entry);
2027 mutex_unlock(&video_list_lock);
2028
2029 kfree(video->attached_array);
2030 kfree(video);
2031
2032 return 0;
2033 }
2034
2035 static int __init is_i740(struct pci_dev *dev)
2036 {
2037 if (dev->device == 0x00D1)
2038 return 1;
2039 if (dev->device == 0x7000)
2040 return 1;
2041 return 0;
2042 }
2043
2044 static int __init intel_opregion_present(void)
2045 {
2046 int opregion = 0;
2047 struct pci_dev *dev = NULL;
2048 u32 address;
2049
2050 for_each_pci_dev(dev) {
2051 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2052 continue;
2053 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2054 continue;
2055 /* We don't want to poke around undefined i740 registers */
2056 if (is_i740(dev))
2057 continue;
2058 pci_read_config_dword(dev, 0xfc, &address);
2059 if (!address)
2060 continue;
2061 opregion = 1;
2062 }
2063 return opregion;
2064 }
2065
2066 int acpi_video_register(void)
2067 {
2068 int ret = 0;
2069
2070 mutex_lock(&register_count_mutex);
2071 if (register_count) {
2072 /*
2073 * if the function of acpi_video_register is already called,
2074 * don't register the acpi_vide_bus again and return no error.
2075 */
2076 goto leave;
2077 }
2078
2079 dmi_check_system(video_dmi_table);
2080
2081 ret = acpi_bus_register_driver(&acpi_video_bus);
2082 if (ret)
2083 goto leave;
2084
2085 /*
2086 * When the acpi_video_bus is loaded successfully, increase
2087 * the counter reference.
2088 */
2089 register_count = 1;
2090
2091 leave:
2092 mutex_unlock(&register_count_mutex);
2093 return ret;
2094 }
2095 EXPORT_SYMBOL(acpi_video_register);
2096
2097 void acpi_video_unregister(void)
2098 {
2099 mutex_lock(&register_count_mutex);
2100 if (register_count) {
2101 acpi_bus_unregister_driver(&acpi_video_bus);
2102 register_count = 0;
2103 }
2104 mutex_unlock(&register_count_mutex);
2105 }
2106 EXPORT_SYMBOL(acpi_video_unregister);
2107
2108 void acpi_video_unregister_backlight(void)
2109 {
2110 struct acpi_video_bus *video;
2111
2112 mutex_lock(&register_count_mutex);
2113 if (register_count) {
2114 mutex_lock(&video_list_lock);
2115 list_for_each_entry(video, &video_bus_head, entry)
2116 acpi_video_bus_unregister_backlight(video);
2117 mutex_unlock(&video_list_lock);
2118 }
2119 mutex_unlock(&register_count_mutex);
2120 }
2121
2122 bool acpi_video_handles_brightness_key_presses(void)
2123 {
2124 bool have_video_busses;
2125
2126 mutex_lock(&video_list_lock);
2127 have_video_busses = !list_empty(&video_bus_head);
2128 mutex_unlock(&video_list_lock);
2129
2130 return have_video_busses &&
2131 (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS);
2132 }
2133 EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses);
2134
2135 /*
2136 * This is kind of nasty. Hardware using Intel chipsets may require
2137 * the video opregion code to be run first in order to initialise
2138 * state before any ACPI video calls are made. To handle this we defer
2139 * registration of the video class until the opregion code has run.
2140 */
2141
2142 static int __init acpi_video_init(void)
2143 {
2144 /*
2145 * Let the module load even if ACPI is disabled (e.g. due to
2146 * a broken BIOS) so that i915.ko can still be loaded on such
2147 * old systems without an AcpiOpRegion.
2148 *
2149 * acpi_video_register() will report -ENODEV later as well due
2150 * to acpi_disabled when i915.ko tries to register itself afterwards.
2151 */
2152 if (acpi_disabled)
2153 return 0;
2154
2155 if (intel_opregion_present())
2156 return 0;
2157
2158 return acpi_video_register();
2159 }
2160
2161 static void __exit acpi_video_exit(void)
2162 {
2163 acpi_video_detect_exit();
2164 acpi_video_unregister();
2165
2166 return;
2167 }
2168
2169 module_init(acpi_video_init);
2170 module_exit(acpi_video_exit);
Linux kernel - Deliverables
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