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drm/exynos: Use VIDEO_SAMSUNG_S5P_G2D=n as G2D Kconfig dependency
[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_brightness_flags {
195 u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
196 u8 _BCL_reversed:1; /* _BCL package is in a reversed order */
197 u8 _BQC_use_index:1; /* _BQC returns an index value */
198 };
199
200 struct acpi_video_device_brightness {
201 int curr;
202 int count;
203 int *levels;
204 struct acpi_video_brightness_flags flags;
205 };
206
207 struct acpi_video_device {
208 unsigned long device_id;
209 struct acpi_video_device_flags flags;
210 struct acpi_video_device_cap cap;
211 struct list_head entry;
212 struct delayed_work switch_brightness_work;
213 int switch_brightness_event;
214 struct acpi_video_bus *video;
215 struct acpi_device *dev;
216 struct acpi_video_device_brightness *brightness;
217 struct backlight_device *backlight;
218 struct thermal_cooling_device *cooling_dev;
219 };
220
221 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
222 static void acpi_video_device_rebind(struct acpi_video_bus *video);
223 static void acpi_video_device_bind(struct acpi_video_bus *video,
224 struct acpi_video_device *device);
225 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
226 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
227 int level);
228 static int acpi_video_device_lcd_get_level_current(
229 struct acpi_video_device *device,
230 unsigned long long *level, bool raw);
231 static int acpi_video_get_next_level(struct acpi_video_device *device,
232 u32 level_current, u32 event);
233 static void acpi_video_switch_brightness(struct work_struct *work);
234
235 /* backlight device sysfs support */
236 static int acpi_video_get_brightness(struct backlight_device *bd)
237 {
238 unsigned long long cur_level;
239 int i;
240 struct acpi_video_device *vd = bl_get_data(bd);
241
242 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
243 return -EINVAL;
244 for (i = 2; i < vd->brightness->count; i++) {
245 if (vd->brightness->levels[i] == cur_level)
246 /*
247 * The first two entries are special - see page 575
248 * of the ACPI spec 3.0
249 */
250 return i - 2;
251 }
252 return 0;
253 }
254
255 static int acpi_video_set_brightness(struct backlight_device *bd)
256 {
257 int request_level = bd->props.brightness + 2;
258 struct acpi_video_device *vd = bl_get_data(bd);
259
260 cancel_delayed_work(&vd->switch_brightness_work);
261 return acpi_video_device_lcd_set_level(vd,
262 vd->brightness->levels[request_level]);
263 }
264
265 static const struct backlight_ops acpi_backlight_ops = {
266 .get_brightness = acpi_video_get_brightness,
267 .update_status = acpi_video_set_brightness,
268 };
269
270 /* thermal cooling device callbacks */
271 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
272 long *state)
273 {
274 struct acpi_device *device = cooling_dev->devdata;
275 struct acpi_video_device *video = acpi_driver_data(device);
276
277 *state = video->brightness->count - 3;
278 return 0;
279 }
280
281 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
282 long *state)
283 {
284 struct acpi_device *device = cooling_dev->devdata;
285 struct acpi_video_device *video = acpi_driver_data(device);
286 unsigned long long level;
287 int offset;
288
289 if (acpi_video_device_lcd_get_level_current(video, &level, false))
290 return -EINVAL;
291 for (offset = 2; offset < video->brightness->count; offset++)
292 if (level == video->brightness->levels[offset]) {
293 *state = video->brightness->count - offset - 1;
294 return 0;
295 }
296
297 return -EINVAL;
298 }
299
300 static int
301 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
302 {
303 struct acpi_device *device = cooling_dev->devdata;
304 struct acpi_video_device *video = acpi_driver_data(device);
305 int level;
306
307 if (state >= video->brightness->count - 2)
308 return -EINVAL;
309
310 state = video->brightness->count - state;
311 level = video->brightness->levels[state - 1];
312 return acpi_video_device_lcd_set_level(video, level);
313 }
314
315 static const struct thermal_cooling_device_ops video_cooling_ops = {
316 .get_max_state = video_get_max_state,
317 .get_cur_state = video_get_cur_state,
318 .set_cur_state = video_set_cur_state,
319 };
320
321 /*
322 * --------------------------------------------------------------------------
323 * Video Management
324 * --------------------------------------------------------------------------
325 */
326
327 static int
328 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
329 union acpi_object **levels)
330 {
331 int status;
332 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
333 union acpi_object *obj;
334
335
336 *levels = NULL;
337
338 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
339 if (!ACPI_SUCCESS(status))
340 return status;
341 obj = (union acpi_object *)buffer.pointer;
342 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
343 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
344 status = -EFAULT;
345 goto err;
346 }
347
348 *levels = obj;
349
350 return 0;
351
352 err:
353 kfree(buffer.pointer);
354
355 return status;
356 }
357
358 static int
359 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
360 {
361 int status;
362 int state;
363
364 status = acpi_execute_simple_method(device->dev->handle,
365 "_BCM", level);
366 if (ACPI_FAILURE(status)) {
367 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
368 return -EIO;
369 }
370
371 device->brightness->curr = level;
372 for (state = 2; state < device->brightness->count; state++)
373 if (level == device->brightness->levels[state]) {
374 if (device->backlight)
375 device->backlight->props.brightness = state - 2;
376 return 0;
377 }
378
379 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
380 return -EINVAL;
381 }
382
383 /*
384 * For some buggy _BQC methods, we need to add a constant value to
385 * the _BQC return value to get the actual current brightness level
386 */
387
388 static int bqc_offset_aml_bug_workaround;
389 static int video_set_bqc_offset(const struct dmi_system_id *d)
390 {
391 bqc_offset_aml_bug_workaround = 9;
392 return 0;
393 }
394
395 static int video_disable_backlight_sysfs_if(
396 const struct dmi_system_id *d)
397 {
398 if (disable_backlight_sysfs_if == -1)
399 disable_backlight_sysfs_if = 1;
400 return 0;
401 }
402
403 static int video_set_device_id_scheme(const struct dmi_system_id *d)
404 {
405 device_id_scheme = true;
406 return 0;
407 }
408
409 static int video_enable_only_lcd(const struct dmi_system_id *d)
410 {
411 only_lcd = true;
412 return 0;
413 }
414
415 static int video_set_report_key_events(const struct dmi_system_id *id)
416 {
417 if (report_key_events == -1)
418 report_key_events = (uintptr_t)id->driver_data;
419 return 0;
420 }
421
422 static struct dmi_system_id video_dmi_table[] = {
423 /*
424 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
425 */
426 {
427 .callback = video_set_bqc_offset,
428 .ident = "Acer Aspire 5720",
429 .matches = {
430 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
431 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
432 },
433 },
434 {
435 .callback = video_set_bqc_offset,
436 .ident = "Acer Aspire 5710Z",
437 .matches = {
438 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
439 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
440 },
441 },
442 {
443 .callback = video_set_bqc_offset,
444 .ident = "eMachines E510",
445 .matches = {
446 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
447 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
448 },
449 },
450 {
451 .callback = video_set_bqc_offset,
452 .ident = "Acer Aspire 5315",
453 .matches = {
454 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
455 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
456 },
457 },
458 {
459 .callback = video_set_bqc_offset,
460 .ident = "Acer Aspire 7720",
461 .matches = {
462 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
463 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
464 },
465 },
466
467 /*
468 * Some machines have a broken acpi-video interface for brightness
469 * control, but still need an acpi_video_device_lcd_set_level() call
470 * on resume to turn the backlight power on. We Enable backlight
471 * control on these systems, but do not register a backlight sysfs
472 * as brightness control does not work.
473 */
474 {
475 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
476 .callback = video_disable_backlight_sysfs_if,
477 .ident = "Toshiba Portege R700",
478 .matches = {
479 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
480 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"),
481 },
482 },
483 {
484 /* https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
485 .callback = video_disable_backlight_sysfs_if,
486 .ident = "Toshiba Portege R830",
487 .matches = {
488 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
489 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R830"),
490 },
491 },
492 {
493 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
494 .callback = video_disable_backlight_sysfs_if,
495 .ident = "Toshiba Satellite R830",
496 .matches = {
497 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
498 DMI_MATCH(DMI_PRODUCT_NAME, "SATELLITE R830"),
499 },
500 },
501 /*
502 * Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set
503 * but the IDs actually follow the Device ID Scheme.
504 */
505 {
506 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
507 .callback = video_set_device_id_scheme,
508 .ident = "ESPRIMO Mobile M9410",
509 .matches = {
510 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
511 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
512 },
513 },
514 /*
515 * Some machines have multiple video output devices, but only the one
516 * that is the type of LCD can do the backlight control so we should not
517 * register backlight interface for other video output devices.
518 */
519 {
520 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
521 .callback = video_enable_only_lcd,
522 .ident = "ESPRIMO Mobile M9410",
523 .matches = {
524 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
525 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
526 },
527 },
528 /*
529 * Some machines report wrong key events on the acpi-bus, suppress
530 * key event reporting on these. Note this is only intended to work
531 * around events which are plain wrong. In some cases we get double
532 * events, in this case acpi-video is considered the canonical source
533 * and the events from the other source should be filtered. E.g.
534 * by calling acpi_video_handles_brightness_key_presses() from the
535 * vendor acpi/wmi driver or by using /lib/udev/hwdb.d/60-keyboard.hwdb
536 */
537 {
538 .callback = video_set_report_key_events,
539 .driver_data = (void *)((uintptr_t)REPORT_OUTPUT_KEY_EVENTS),
540 .ident = "Dell Vostro V131",
541 .matches = {
542 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
543 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
544 },
545 },
546 {}
547 };
548
549 static unsigned long long
550 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
551 unsigned long long bqc_value)
552 {
553 unsigned long long level;
554
555 if (device->brightness->flags._BQC_use_index) {
556 /*
557 * _BQC returns an index that doesn't account for
558 * the first 2 items with special meaning, so we need
559 * to compensate for that by offsetting ourselves
560 */
561 if (device->brightness->flags._BCL_reversed)
562 bqc_value = device->brightness->count - 3 - bqc_value;
563
564 level = device->brightness->levels[bqc_value + 2];
565 } else {
566 level = bqc_value;
567 }
568
569 level += bqc_offset_aml_bug_workaround;
570
571 return level;
572 }
573
574 static int
575 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
576 unsigned long long *level, bool raw)
577 {
578 acpi_status status = AE_OK;
579 int i;
580
581 if (device->cap._BQC || device->cap._BCQ) {
582 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
583
584 status = acpi_evaluate_integer(device->dev->handle, buf,
585 NULL, level);
586 if (ACPI_SUCCESS(status)) {
587 if (raw) {
588 /*
589 * Caller has indicated he wants the raw
590 * value returned by _BQC, so don't furtherly
591 * mess with the value.
592 */
593 return 0;
594 }
595
596 *level = acpi_video_bqc_value_to_level(device, *level);
597
598 for (i = 2; i < device->brightness->count; i++)
599 if (device->brightness->levels[i] == *level) {
600 device->brightness->curr = *level;
601 return 0;
602 }
603 /*
604 * BQC returned an invalid level.
605 * Stop using it.
606 */
607 ACPI_WARNING((AE_INFO,
608 "%s returned an invalid level",
609 buf));
610 device->cap._BQC = device->cap._BCQ = 0;
611 } else {
612 /*
613 * Fixme:
614 * should we return an error or ignore this failure?
615 * dev->brightness->curr is a cached value which stores
616 * the correct current backlight level in most cases.
617 * ACPI video backlight still works w/ buggy _BQC.
618 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
619 */
620 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
621 device->cap._BQC = device->cap._BCQ = 0;
622 }
623 }
624
625 *level = device->brightness->curr;
626 return 0;
627 }
628
629 static int
630 acpi_video_device_EDID(struct acpi_video_device *device,
631 union acpi_object **edid, ssize_t length)
632 {
633 int status;
634 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
635 union acpi_object *obj;
636 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
637 struct acpi_object_list args = { 1, &arg0 };
638
639
640 *edid = NULL;
641
642 if (!device)
643 return -ENODEV;
644 if (length == 128)
645 arg0.integer.value = 1;
646 else if (length == 256)
647 arg0.integer.value = 2;
648 else
649 return -EINVAL;
650
651 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
652 if (ACPI_FAILURE(status))
653 return -ENODEV;
654
655 obj = buffer.pointer;
656
657 if (obj && obj->type == ACPI_TYPE_BUFFER)
658 *edid = obj;
659 else {
660 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
661 status = -EFAULT;
662 kfree(obj);
663 }
664
665 return status;
666 }
667
668 /* bus */
669
670 /*
671 * Arg:
672 * video : video bus device pointer
673 * bios_flag :
674 * 0. The system BIOS should NOT automatically switch(toggle)
675 * the active display output.
676 * 1. The system BIOS should automatically switch (toggle) the
677 * active display output. No switch event.
678 * 2. The _DGS value should be locked.
679 * 3. The system BIOS should not automatically switch (toggle) the
680 * active display output, but instead generate the display switch
681 * event notify code.
682 * lcd_flag :
683 * 0. The system BIOS should automatically control the brightness level
684 * of the LCD when the power changes from AC to DC
685 * 1. The system BIOS should NOT automatically control the brightness
686 * level of the LCD when the power changes from AC to DC.
687 * Return Value:
688 * -EINVAL wrong arg.
689 */
690
691 static int
692 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
693 {
694 acpi_status status;
695
696 if (!video->cap._DOS)
697 return 0;
698
699 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
700 return -EINVAL;
701 video->dos_setting = (lcd_flag << 2) | bios_flag;
702 status = acpi_execute_simple_method(video->device->handle, "_DOS",
703 (lcd_flag << 2) | bios_flag);
704 if (ACPI_FAILURE(status))
705 return -EIO;
706
707 return 0;
708 }
709
710 /*
711 * Simple comparison function used to sort backlight levels.
712 */
713
714 static int
715 acpi_video_cmp_level(const void *a, const void *b)
716 {
717 return *(int *)a - *(int *)b;
718 }
719
720 /*
721 * Decides if _BQC/_BCQ for this system is usable
722 *
723 * We do this by changing the level first and then read out the current
724 * brightness level, if the value does not match, find out if it is using
725 * index. If not, clear the _BQC/_BCQ capability.
726 */
727 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
728 int max_level, int current_level)
729 {
730 struct acpi_video_device_brightness *br = device->brightness;
731 int result;
732 unsigned long long level;
733 int test_level;
734
735 /* don't mess with existing known broken systems */
736 if (bqc_offset_aml_bug_workaround)
737 return 0;
738
739 /*
740 * Some systems always report current brightness level as maximum
741 * through _BQC, we need to test another value for them.
742 */
743 test_level = current_level == max_level ? br->levels[3] : max_level;
744
745 result = acpi_video_device_lcd_set_level(device, test_level);
746 if (result)
747 return result;
748
749 result = acpi_video_device_lcd_get_level_current(device, &level, true);
750 if (result)
751 return result;
752
753 if (level != test_level) {
754 /* buggy _BQC found, need to find out if it uses index */
755 if (level < br->count) {
756 if (br->flags._BCL_reversed)
757 level = br->count - 3 - level;
758 if (br->levels[level + 2] == test_level)
759 br->flags._BQC_use_index = 1;
760 }
761
762 if (!br->flags._BQC_use_index)
763 device->cap._BQC = device->cap._BCQ = 0;
764 }
765
766 return 0;
767 }
768
769
770 /*
771 * Arg:
772 * device : video output device (LCD, CRT, ..)
773 *
774 * Return Value:
775 * Maximum brightness level
776 *
777 * Allocate and initialize device->brightness.
778 */
779
780 static int
781 acpi_video_init_brightness(struct acpi_video_device *device)
782 {
783 union acpi_object *obj = NULL;
784 int i, max_level = 0, count = 0, level_ac_battery = 0;
785 unsigned long long level, level_old;
786 union acpi_object *o;
787 struct acpi_video_device_brightness *br = NULL;
788 int result = -EINVAL;
789 u32 value;
790
791 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
792 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
793 "LCD brightness level\n"));
794 goto out;
795 }
796
797 if (obj->package.count < 2)
798 goto out;
799
800 br = kzalloc(sizeof(*br), GFP_KERNEL);
801 if (!br) {
802 printk(KERN_ERR "can't allocate memory\n");
803 result = -ENOMEM;
804 goto out;
805 }
806
807 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
808 GFP_KERNEL);
809 if (!br->levels) {
810 result = -ENOMEM;
811 goto out_free;
812 }
813
814 for (i = 0; i < obj->package.count; i++) {
815 o = (union acpi_object *)&obj->package.elements[i];
816 if (o->type != ACPI_TYPE_INTEGER) {
817 printk(KERN_ERR PREFIX "Invalid data\n");
818 continue;
819 }
820 value = (u32) o->integer.value;
821 /* Skip duplicate entries */
822 if (count > 2 && br->levels[count - 1] == value)
823 continue;
824
825 br->levels[count] = value;
826
827 if (br->levels[count] > max_level)
828 max_level = br->levels[count];
829 count++;
830 }
831
832 /*
833 * some buggy BIOS don't export the levels
834 * when machine is on AC/Battery in _BCL package.
835 * In this case, the first two elements in _BCL packages
836 * are also supported brightness levels that OS should take care of.
837 */
838 for (i = 2; i < count; i++) {
839 if (br->levels[i] == br->levels[0])
840 level_ac_battery++;
841 if (br->levels[i] == br->levels[1])
842 level_ac_battery++;
843 }
844
845 if (level_ac_battery < 2) {
846 level_ac_battery = 2 - level_ac_battery;
847 br->flags._BCL_no_ac_battery_levels = 1;
848 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
849 br->levels[i] = br->levels[i - level_ac_battery];
850 count += level_ac_battery;
851 } else if (level_ac_battery > 2)
852 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
853
854 /* Check if the _BCL package is in a reversed order */
855 if (max_level == br->levels[2]) {
856 br->flags._BCL_reversed = 1;
857 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
858 acpi_video_cmp_level, NULL);
859 } else if (max_level != br->levels[count - 1])
860 ACPI_ERROR((AE_INFO,
861 "Found unordered _BCL package"));
862
863 br->count = count;
864 device->brightness = br;
865
866 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
867 br->curr = level = max_level;
868
869 if (!device->cap._BQC)
870 goto set_level;
871
872 result = acpi_video_device_lcd_get_level_current(device,
873 &level_old, true);
874 if (result)
875 goto out_free_levels;
876
877 result = acpi_video_bqc_quirk(device, max_level, level_old);
878 if (result)
879 goto out_free_levels;
880 /*
881 * cap._BQC may get cleared due to _BQC is found to be broken
882 * in acpi_video_bqc_quirk, so check again here.
883 */
884 if (!device->cap._BQC)
885 goto set_level;
886
887 level = acpi_video_bqc_value_to_level(device, level_old);
888 /*
889 * On some buggy laptops, _BQC returns an uninitialized
890 * value when invoked for the first time, i.e.
891 * level_old is invalid (no matter whether it's a level
892 * or an index). Set the backlight to max_level in this case.
893 */
894 for (i = 2; i < br->count; i++)
895 if (level == br->levels[i])
896 break;
897 if (i == br->count || !level)
898 level = max_level;
899
900 set_level:
901 result = acpi_video_device_lcd_set_level(device, level);
902 if (result)
903 goto out_free_levels;
904
905 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
906 "found %d brightness levels\n", count - 2));
907 kfree(obj);
908 return result;
909
910 out_free_levels:
911 kfree(br->levels);
912 out_free:
913 kfree(br);
914 out:
915 device->brightness = NULL;
916 kfree(obj);
917 return result;
918 }
919
920 /*
921 * Arg:
922 * device : video output device (LCD, CRT, ..)
923 *
924 * Return Value:
925 * None
926 *
927 * Find out all required AML methods defined under the output
928 * device.
929 */
930
931 static void acpi_video_device_find_cap(struct acpi_video_device *device)
932 {
933 if (acpi_has_method(device->dev->handle, "_ADR"))
934 device->cap._ADR = 1;
935 if (acpi_has_method(device->dev->handle, "_BCL"))
936 device->cap._BCL = 1;
937 if (acpi_has_method(device->dev->handle, "_BCM"))
938 device->cap._BCM = 1;
939 if (acpi_has_method(device->dev->handle, "_BQC")) {
940 device->cap._BQC = 1;
941 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
942 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
943 device->cap._BCQ = 1;
944 }
945
946 if (acpi_has_method(device->dev->handle, "_DDC"))
947 device->cap._DDC = 1;
948 }
949
950 /*
951 * Arg:
952 * device : video output device (VGA)
953 *
954 * Return Value:
955 * None
956 *
957 * Find out all required AML methods defined under the video bus device.
958 */
959
960 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
961 {
962 if (acpi_has_method(video->device->handle, "_DOS"))
963 video->cap._DOS = 1;
964 if (acpi_has_method(video->device->handle, "_DOD"))
965 video->cap._DOD = 1;
966 if (acpi_has_method(video->device->handle, "_ROM"))
967 video->cap._ROM = 1;
968 if (acpi_has_method(video->device->handle, "_GPD"))
969 video->cap._GPD = 1;
970 if (acpi_has_method(video->device->handle, "_SPD"))
971 video->cap._SPD = 1;
972 if (acpi_has_method(video->device->handle, "_VPO"))
973 video->cap._VPO = 1;
974 }
975
976 /*
977 * Check whether the video bus device has required AML method to
978 * support the desired features
979 */
980
981 static int acpi_video_bus_check(struct acpi_video_bus *video)
982 {
983 acpi_status status = -ENOENT;
984 struct pci_dev *dev;
985
986 if (!video)
987 return -EINVAL;
988
989 dev = acpi_get_pci_dev(video->device->handle);
990 if (!dev)
991 return -ENODEV;
992 pci_dev_put(dev);
993
994 /*
995 * Since there is no HID, CID and so on for VGA driver, we have
996 * to check well known required nodes.
997 */
998
999 /* Does this device support video switching? */
1000 if (video->cap._DOS || video->cap._DOD) {
1001 if (!video->cap._DOS) {
1002 printk(KERN_WARNING FW_BUG
1003 "ACPI(%s) defines _DOD but not _DOS\n",
1004 acpi_device_bid(video->device));
1005 }
1006 video->flags.multihead = 1;
1007 status = 0;
1008 }
1009
1010 /* Does this device support retrieving a video ROM? */
1011 if (video->cap._ROM) {
1012 video->flags.rom = 1;
1013 status = 0;
1014 }
1015
1016 /* Does this device support configuring which video device to POST? */
1017 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1018 video->flags.post = 1;
1019 status = 0;
1020 }
1021
1022 return status;
1023 }
1024
1025 /*
1026 * --------------------------------------------------------------------------
1027 * Driver Interface
1028 * --------------------------------------------------------------------------
1029 */
1030
1031 /* device interface */
1032 static struct acpi_video_device_attrib *
1033 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1034 {
1035 struct acpi_video_enumerated_device *ids;
1036 int i;
1037
1038 for (i = 0; i < video->attached_count; i++) {
1039 ids = &video->attached_array[i];
1040 if ((ids->value.int_val & 0xffff) == device_id)
1041 return &ids->value.attrib;
1042 }
1043
1044 return NULL;
1045 }
1046
1047 static int
1048 acpi_video_get_device_type(struct acpi_video_bus *video,
1049 unsigned long device_id)
1050 {
1051 struct acpi_video_enumerated_device *ids;
1052 int i;
1053
1054 for (i = 0; i < video->attached_count; i++) {
1055 ids = &video->attached_array[i];
1056 if ((ids->value.int_val & 0xffff) == device_id)
1057 return ids->value.int_val;
1058 }
1059
1060 return 0;
1061 }
1062
1063 static int
1064 acpi_video_bus_get_one_device(struct acpi_device *device,
1065 struct acpi_video_bus *video)
1066 {
1067 unsigned long long device_id;
1068 int status, device_type;
1069 struct acpi_video_device *data;
1070 struct acpi_video_device_attrib *attribute;
1071
1072 status =
1073 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1074 /* Some device omits _ADR, we skip them instead of fail */
1075 if (ACPI_FAILURE(status))
1076 return 0;
1077
1078 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1079 if (!data)
1080 return -ENOMEM;
1081
1082 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1083 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1084 device->driver_data = data;
1085
1086 data->device_id = device_id;
1087 data->video = video;
1088 data->dev = device;
1089 INIT_DELAYED_WORK(&data->switch_brightness_work,
1090 acpi_video_switch_brightness);
1091
1092 attribute = acpi_video_get_device_attr(video, device_id);
1093
1094 if (attribute && (attribute->device_id_scheme || device_id_scheme)) {
1095 switch (attribute->display_type) {
1096 case ACPI_VIDEO_DISPLAY_CRT:
1097 data->flags.crt = 1;
1098 break;
1099 case ACPI_VIDEO_DISPLAY_TV:
1100 data->flags.tvout = 1;
1101 break;
1102 case ACPI_VIDEO_DISPLAY_DVI:
1103 data->flags.dvi = 1;
1104 break;
1105 case ACPI_VIDEO_DISPLAY_LCD:
1106 data->flags.lcd = 1;
1107 break;
1108 default:
1109 data->flags.unknown = 1;
1110 break;
1111 }
1112 if (attribute->bios_can_detect)
1113 data->flags.bios = 1;
1114 } else {
1115 /* Check for legacy IDs */
1116 device_type = acpi_video_get_device_type(video, device_id);
1117 /* Ignore bits 16 and 18-20 */
1118 switch (device_type & 0xffe2ffff) {
1119 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1120 data->flags.crt = 1;
1121 break;
1122 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1123 data->flags.lcd = 1;
1124 break;
1125 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1126 data->flags.tvout = 1;
1127 break;
1128 default:
1129 data->flags.unknown = 1;
1130 }
1131 }
1132
1133 acpi_video_device_bind(video, data);
1134 acpi_video_device_find_cap(data);
1135
1136 mutex_lock(&video->device_list_lock);
1137 list_add_tail(&data->entry, &video->video_device_list);
1138 mutex_unlock(&video->device_list_lock);
1139
1140 return status;
1141 }
1142
1143 /*
1144 * Arg:
1145 * video : video bus device
1146 *
1147 * Return:
1148 * none
1149 *
1150 * Enumerate the video device list of the video bus,
1151 * bind the ids with the corresponding video devices
1152 * under the video bus.
1153 */
1154
1155 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1156 {
1157 struct acpi_video_device *dev;
1158
1159 mutex_lock(&video->device_list_lock);
1160
1161 list_for_each_entry(dev, &video->video_device_list, entry)
1162 acpi_video_device_bind(video, dev);
1163
1164 mutex_unlock(&video->device_list_lock);
1165 }
1166
1167 /*
1168 * Arg:
1169 * video : video bus device
1170 * device : video output device under the video
1171 * bus
1172 *
1173 * Return:
1174 * none
1175 *
1176 * Bind the ids with the corresponding video devices
1177 * under the video bus.
1178 */
1179
1180 static void
1181 acpi_video_device_bind(struct acpi_video_bus *video,
1182 struct acpi_video_device *device)
1183 {
1184 struct acpi_video_enumerated_device *ids;
1185 int i;
1186
1187 for (i = 0; i < video->attached_count; i++) {
1188 ids = &video->attached_array[i];
1189 if (device->device_id == (ids->value.int_val & 0xffff)) {
1190 ids->bind_info = device;
1191 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1192 }
1193 }
1194 }
1195
1196 static bool acpi_video_device_in_dod(struct acpi_video_device *device)
1197 {
1198 struct acpi_video_bus *video = device->video;
1199 int i;
1200
1201 /*
1202 * If we have a broken _DOD or we have more than 8 output devices
1203 * under the graphics controller node that we can't proper deal with
1204 * in the operation region code currently, no need to test.
1205 */
1206 if (!video->attached_count || video->child_count > 8)
1207 return true;
1208
1209 for (i = 0; i < video->attached_count; i++) {
1210 if ((video->attached_array[i].value.int_val & 0xfff) ==
1211 (device->device_id & 0xfff))
1212 return true;
1213 }
1214
1215 return false;
1216 }
1217
1218 /*
1219 * Arg:
1220 * video : video bus device
1221 *
1222 * Return:
1223 * < 0 : error
1224 *
1225 * Call _DOD to enumerate all devices attached to display adapter
1226 *
1227 */
1228
1229 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1230 {
1231 int status;
1232 int count;
1233 int i;
1234 struct acpi_video_enumerated_device *active_list;
1235 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1236 union acpi_object *dod = NULL;
1237 union acpi_object *obj;
1238
1239 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1240 if (!ACPI_SUCCESS(status)) {
1241 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1242 return status;
1243 }
1244
1245 dod = buffer.pointer;
1246 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1247 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1248 status = -EFAULT;
1249 goto out;
1250 }
1251
1252 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1253 dod->package.count));
1254
1255 active_list = kcalloc(1 + dod->package.count,
1256 sizeof(struct acpi_video_enumerated_device),
1257 GFP_KERNEL);
1258 if (!active_list) {
1259 status = -ENOMEM;
1260 goto out;
1261 }
1262
1263 count = 0;
1264 for (i = 0; i < dod->package.count; i++) {
1265 obj = &dod->package.elements[i];
1266
1267 if (obj->type != ACPI_TYPE_INTEGER) {
1268 printk(KERN_ERR PREFIX
1269 "Invalid _DOD data in element %d\n", i);
1270 continue;
1271 }
1272
1273 active_list[count].value.int_val = obj->integer.value;
1274 active_list[count].bind_info = NULL;
1275 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1276 (int)obj->integer.value));
1277 count++;
1278 }
1279
1280 kfree(video->attached_array);
1281
1282 video->attached_array = active_list;
1283 video->attached_count = count;
1284
1285 out:
1286 kfree(buffer.pointer);
1287 return status;
1288 }
1289
1290 static int
1291 acpi_video_get_next_level(struct acpi_video_device *device,
1292 u32 level_current, u32 event)
1293 {
1294 int min, max, min_above, max_below, i, l, delta = 255;
1295 max = max_below = 0;
1296 min = min_above = 255;
1297 /* Find closest level to level_current */
1298 for (i = 2; i < device->brightness->count; i++) {
1299 l = device->brightness->levels[i];
1300 if (abs(l - level_current) < abs(delta)) {
1301 delta = l - level_current;
1302 if (!delta)
1303 break;
1304 }
1305 }
1306 /* Ajust level_current to closest available level */
1307 level_current += delta;
1308 for (i = 2; i < device->brightness->count; i++) {
1309 l = device->brightness->levels[i];
1310 if (l < min)
1311 min = l;
1312 if (l > max)
1313 max = l;
1314 if (l < min_above && l > level_current)
1315 min_above = l;
1316 if (l > max_below && l < level_current)
1317 max_below = l;
1318 }
1319
1320 switch (event) {
1321 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1322 return (level_current < max) ? min_above : min;
1323 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1324 return (level_current < max) ? min_above : max;
1325 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1326 return (level_current > min) ? max_below : min;
1327 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1328 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1329 return 0;
1330 default:
1331 return level_current;
1332 }
1333 }
1334
1335 static void
1336 acpi_video_switch_brightness(struct work_struct *work)
1337 {
1338 struct acpi_video_device *device = container_of(to_delayed_work(work),
1339 struct acpi_video_device, switch_brightness_work);
1340 unsigned long long level_current, level_next;
1341 int event = device->switch_brightness_event;
1342 int result = -EINVAL;
1343
1344 /* no warning message if acpi_backlight=vendor or a quirk is used */
1345 if (!device->backlight)
1346 return;
1347
1348 if (!device->brightness)
1349 goto out;
1350
1351 result = acpi_video_device_lcd_get_level_current(device,
1352 &level_current,
1353 false);
1354 if (result)
1355 goto out;
1356
1357 level_next = acpi_video_get_next_level(device, level_current, event);
1358
1359 result = acpi_video_device_lcd_set_level(device, level_next);
1360
1361 if (!result)
1362 backlight_force_update(device->backlight,
1363 BACKLIGHT_UPDATE_HOTKEY);
1364
1365 out:
1366 if (result)
1367 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1368 }
1369
1370 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1371 void **edid)
1372 {
1373 struct acpi_video_bus *video;
1374 struct acpi_video_device *video_device;
1375 union acpi_object *buffer = NULL;
1376 acpi_status status;
1377 int i, length;
1378
1379 if (!device || !acpi_driver_data(device))
1380 return -EINVAL;
1381
1382 video = acpi_driver_data(device);
1383
1384 for (i = 0; i < video->attached_count; i++) {
1385 video_device = video->attached_array[i].bind_info;
1386 length = 256;
1387
1388 if (!video_device)
1389 continue;
1390
1391 if (!video_device->cap._DDC)
1392 continue;
1393
1394 if (type) {
1395 switch (type) {
1396 case ACPI_VIDEO_DISPLAY_CRT:
1397 if (!video_device->flags.crt)
1398 continue;
1399 break;
1400 case ACPI_VIDEO_DISPLAY_TV:
1401 if (!video_device->flags.tvout)
1402 continue;
1403 break;
1404 case ACPI_VIDEO_DISPLAY_DVI:
1405 if (!video_device->flags.dvi)
1406 continue;
1407 break;
1408 case ACPI_VIDEO_DISPLAY_LCD:
1409 if (!video_device->flags.lcd)
1410 continue;
1411 break;
1412 }
1413 } else if (video_device->device_id != device_id) {
1414 continue;
1415 }
1416
1417 status = acpi_video_device_EDID(video_device, &buffer, length);
1418
1419 if (ACPI_FAILURE(status) || !buffer ||
1420 buffer->type != ACPI_TYPE_BUFFER) {
1421 length = 128;
1422 status = acpi_video_device_EDID(video_device, &buffer,
1423 length);
1424 if (ACPI_FAILURE(status) || !buffer ||
1425 buffer->type != ACPI_TYPE_BUFFER) {
1426 continue;
1427 }
1428 }
1429
1430 *edid = buffer->buffer.pointer;
1431 return length;
1432 }
1433
1434 return -ENODEV;
1435 }
1436 EXPORT_SYMBOL(acpi_video_get_edid);
1437
1438 static int
1439 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1440 struct acpi_device *device)
1441 {
1442 int status = 0;
1443 struct acpi_device *dev;
1444
1445 /*
1446 * There are systems where video module known to work fine regardless
1447 * of broken _DOD and ignoring returned value here doesn't cause
1448 * any issues later.
1449 */
1450 acpi_video_device_enumerate(video);
1451
1452 list_for_each_entry(dev, &device->children, node) {
1453
1454 status = acpi_video_bus_get_one_device(dev, video);
1455 if (status) {
1456 dev_err(&dev->dev, "Can't attach device\n");
1457 break;
1458 }
1459 video->child_count++;
1460 }
1461 return status;
1462 }
1463
1464 /* acpi_video interface */
1465
1466 /*
1467 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1468 * preform any automatic brightness change on receiving a notification.
1469 */
1470 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1471 {
1472 return acpi_video_bus_DOS(video, 0,
1473 acpi_osi_is_win8() ? 1 : 0);
1474 }
1475
1476 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1477 {
1478 return acpi_video_bus_DOS(video, 0,
1479 acpi_osi_is_win8() ? 0 : 1);
1480 }
1481
1482 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1483 {
1484 struct acpi_video_bus *video = acpi_driver_data(device);
1485 struct input_dev *input;
1486 int keycode = 0;
1487
1488 if (!video || !video->input)
1489 return;
1490
1491 input = video->input;
1492
1493 switch (event) {
1494 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1495 * most likely via hotkey. */
1496 keycode = KEY_SWITCHVIDEOMODE;
1497 break;
1498
1499 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1500 * connector. */
1501 acpi_video_device_enumerate(video);
1502 acpi_video_device_rebind(video);
1503 keycode = KEY_SWITCHVIDEOMODE;
1504 break;
1505
1506 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1507 keycode = KEY_SWITCHVIDEOMODE;
1508 break;
1509 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1510 keycode = KEY_VIDEO_NEXT;
1511 break;
1512 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1513 keycode = KEY_VIDEO_PREV;
1514 break;
1515
1516 default:
1517 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1518 "Unsupported event [0x%x]\n", event));
1519 break;
1520 }
1521
1522 if (acpi_notifier_call_chain(device, event, 0))
1523 /* Something vetoed the keypress. */
1524 keycode = 0;
1525
1526 if (keycode && (report_key_events & REPORT_OUTPUT_KEY_EVENTS)) {
1527 input_report_key(input, keycode, 1);
1528 input_sync(input);
1529 input_report_key(input, keycode, 0);
1530 input_sync(input);
1531 }
1532
1533 return;
1534 }
1535
1536 static void brightness_switch_event(struct acpi_video_device *video_device,
1537 u32 event)
1538 {
1539 if (!brightness_switch_enabled)
1540 return;
1541
1542 video_device->switch_brightness_event = event;
1543 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10);
1544 }
1545
1546 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1547 {
1548 struct acpi_video_device *video_device = data;
1549 struct acpi_device *device = NULL;
1550 struct acpi_video_bus *bus;
1551 struct input_dev *input;
1552 int keycode = 0;
1553
1554 if (!video_device)
1555 return;
1556
1557 device = video_device->dev;
1558 bus = video_device->video;
1559 input = bus->input;
1560
1561 switch (event) {
1562 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1563 brightness_switch_event(video_device, event);
1564 keycode = KEY_BRIGHTNESS_CYCLE;
1565 break;
1566 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1567 brightness_switch_event(video_device, event);
1568 keycode = KEY_BRIGHTNESSUP;
1569 break;
1570 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1571 brightness_switch_event(video_device, event);
1572 keycode = KEY_BRIGHTNESSDOWN;
1573 break;
1574 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1575 brightness_switch_event(video_device, event);
1576 keycode = KEY_BRIGHTNESS_ZERO;
1577 break;
1578 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1579 brightness_switch_event(video_device, event);
1580 keycode = KEY_DISPLAY_OFF;
1581 break;
1582 default:
1583 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1584 "Unsupported event [0x%x]\n", event));
1585 break;
1586 }
1587
1588 acpi_notifier_call_chain(device, event, 0);
1589
1590 if (keycode && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS)) {
1591 input_report_key(input, keycode, 1);
1592 input_sync(input);
1593 input_report_key(input, keycode, 0);
1594 input_sync(input);
1595 }
1596
1597 return;
1598 }
1599
1600 static int acpi_video_resume(struct notifier_block *nb,
1601 unsigned long val, void *ign)
1602 {
1603 struct acpi_video_bus *video;
1604 struct acpi_video_device *video_device;
1605 int i;
1606
1607 switch (val) {
1608 case PM_HIBERNATION_PREPARE:
1609 case PM_SUSPEND_PREPARE:
1610 case PM_RESTORE_PREPARE:
1611 return NOTIFY_DONE;
1612 }
1613
1614 video = container_of(nb, struct acpi_video_bus, pm_nb);
1615
1616 dev_info(&video->device->dev, "Restoring backlight state\n");
1617
1618 for (i = 0; i < video->attached_count; i++) {
1619 video_device = video->attached_array[i].bind_info;
1620 if (video_device && video_device->brightness)
1621 acpi_video_device_lcd_set_level(video_device,
1622 video_device->brightness->curr);
1623 }
1624
1625 return NOTIFY_OK;
1626 }
1627
1628 static acpi_status
1629 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1630 void **return_value)
1631 {
1632 struct acpi_device *device = context;
1633 struct acpi_device *sibling;
1634 int result;
1635
1636 if (handle == device->handle)
1637 return AE_CTRL_TERMINATE;
1638
1639 result = acpi_bus_get_device(handle, &sibling);
1640 if (result)
1641 return AE_OK;
1642
1643 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1644 return AE_ALREADY_EXISTS;
1645
1646 return AE_OK;
1647 }
1648
1649 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1650 {
1651 struct backlight_properties props;
1652 struct pci_dev *pdev;
1653 acpi_handle acpi_parent;
1654 struct device *parent = NULL;
1655 int result;
1656 static int count;
1657 char *name;
1658
1659 result = acpi_video_init_brightness(device);
1660 if (result)
1661 return;
1662
1663 if (disable_backlight_sysfs_if > 0)
1664 return;
1665
1666 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1667 if (!name)
1668 return;
1669 count++;
1670
1671 acpi_get_parent(device->dev->handle, &acpi_parent);
1672
1673 pdev = acpi_get_pci_dev(acpi_parent);
1674 if (pdev) {
1675 parent = &pdev->dev;
1676 pci_dev_put(pdev);
1677 }
1678
1679 memset(&props, 0, sizeof(struct backlight_properties));
1680 props.type = BACKLIGHT_FIRMWARE;
1681 props.max_brightness = device->brightness->count - 3;
1682 device->backlight = backlight_device_register(name,
1683 parent,
1684 device,
1685 &acpi_backlight_ops,
1686 &props);
1687 kfree(name);
1688 if (IS_ERR(device->backlight)) {
1689 device->backlight = NULL;
1690 return;
1691 }
1692
1693 /*
1694 * Save current brightness level in case we have to restore it
1695 * before acpi_video_device_lcd_set_level() is called next time.
1696 */
1697 device->backlight->props.brightness =
1698 acpi_video_get_brightness(device->backlight);
1699
1700 device->cooling_dev = thermal_cooling_device_register("LCD",
1701 device->dev, &video_cooling_ops);
1702 if (IS_ERR(device->cooling_dev)) {
1703 /*
1704 * Set cooling_dev to NULL so we don't crash trying to free it.
1705 * Also, why the hell we are returning early and not attempt to
1706 * register video output if cooling device registration failed?
1707 * -- dtor
1708 */
1709 device->cooling_dev = NULL;
1710 return;
1711 }
1712
1713 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1714 device->cooling_dev->id);
1715 result = sysfs_create_link(&device->dev->dev.kobj,
1716 &device->cooling_dev->device.kobj,
1717 "thermal_cooling");
1718 if (result)
1719 printk(KERN_ERR PREFIX "Create sysfs link\n");
1720 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1721 &device->dev->dev.kobj, "device");
1722 if (result)
1723 printk(KERN_ERR PREFIX "Create sysfs link\n");
1724 }
1725
1726 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video)
1727 {
1728 struct acpi_video_device *dev;
1729 union acpi_object *levels;
1730
1731 mutex_lock(&video->device_list_lock);
1732 list_for_each_entry(dev, &video->video_device_list, entry) {
1733 if (!acpi_video_device_lcd_query_levels(dev, &levels))
1734 kfree(levels);
1735 }
1736 mutex_unlock(&video->device_list_lock);
1737 }
1738
1739 static bool acpi_video_should_register_backlight(struct acpi_video_device *dev)
1740 {
1741 /*
1742 * Do not create backlight device for video output
1743 * device that is not in the enumerated list.
1744 */
1745 if (!acpi_video_device_in_dod(dev)) {
1746 dev_dbg(&dev->dev->dev, "not in _DOD list, ignore\n");
1747 return false;
1748 }
1749
1750 if (only_lcd)
1751 return dev->flags.lcd;
1752 return true;
1753 }
1754
1755 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1756 {
1757 struct acpi_video_device *dev;
1758
1759 if (video->backlight_registered)
1760 return 0;
1761
1762 acpi_video_run_bcl_for_osi(video);
1763
1764 if (acpi_video_get_backlight_type() != acpi_backlight_video)
1765 return 0;
1766
1767 mutex_lock(&video->device_list_lock);
1768 list_for_each_entry(dev, &video->video_device_list, entry) {
1769 if (acpi_video_should_register_backlight(dev))
1770 acpi_video_dev_register_backlight(dev);
1771 }
1772 mutex_unlock(&video->device_list_lock);
1773
1774 video->backlight_registered = true;
1775
1776 video->pm_nb.notifier_call = acpi_video_resume;
1777 video->pm_nb.priority = 0;
1778 return register_pm_notifier(&video->pm_nb);
1779 }
1780
1781 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1782 {
1783 if (device->backlight) {
1784 backlight_device_unregister(device->backlight);
1785 device->backlight = NULL;
1786 }
1787 if (device->brightness) {
1788 kfree(device->brightness->levels);
1789 kfree(device->brightness);
1790 device->brightness = NULL;
1791 }
1792 if (device->cooling_dev) {
1793 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1794 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1795 thermal_cooling_device_unregister(device->cooling_dev);
1796 device->cooling_dev = NULL;
1797 }
1798 }
1799
1800 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1801 {
1802 struct acpi_video_device *dev;
1803 int error;
1804
1805 if (!video->backlight_registered)
1806 return 0;
1807
1808 error = unregister_pm_notifier(&video->pm_nb);
1809
1810 mutex_lock(&video->device_list_lock);
1811 list_for_each_entry(dev, &video->video_device_list, entry)
1812 acpi_video_dev_unregister_backlight(dev);
1813 mutex_unlock(&video->device_list_lock);
1814
1815 video->backlight_registered = false;
1816
1817 return error;
1818 }
1819
1820 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1821 {
1822 acpi_status status;
1823 struct acpi_device *adev = device->dev;
1824
1825 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1826 acpi_video_device_notify, device);
1827 if (ACPI_FAILURE(status))
1828 dev_err(&adev->dev, "Error installing notify handler\n");
1829 else
1830 device->flags.notify = 1;
1831 }
1832
1833 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1834 {
1835 struct input_dev *input;
1836 struct acpi_video_device *dev;
1837 int error;
1838
1839 video->input = input = input_allocate_device();
1840 if (!input) {
1841 error = -ENOMEM;
1842 goto out;
1843 }
1844
1845 error = acpi_video_bus_start_devices(video);
1846 if (error)
1847 goto err_free_input;
1848
1849 snprintf(video->phys, sizeof(video->phys),
1850 "%s/video/input0", acpi_device_hid(video->device));
1851
1852 input->name = acpi_device_name(video->device);
1853 input->phys = video->phys;
1854 input->id.bustype = BUS_HOST;
1855 input->id.product = 0x06;
1856 input->dev.parent = &video->device->dev;
1857 input->evbit[0] = BIT(EV_KEY);
1858 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1859 set_bit(KEY_VIDEO_NEXT, input->keybit);
1860 set_bit(KEY_VIDEO_PREV, input->keybit);
1861 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1862 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1863 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1864 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1865 set_bit(KEY_DISPLAY_OFF, input->keybit);
1866
1867 error = input_register_device(input);
1868 if (error)
1869 goto err_stop_dev;
1870
1871 mutex_lock(&video->device_list_lock);
1872 list_for_each_entry(dev, &video->video_device_list, entry)
1873 acpi_video_dev_add_notify_handler(dev);
1874 mutex_unlock(&video->device_list_lock);
1875
1876 return 0;
1877
1878 err_stop_dev:
1879 acpi_video_bus_stop_devices(video);
1880 err_free_input:
1881 input_free_device(input);
1882 video->input = NULL;
1883 out:
1884 return error;
1885 }
1886
1887 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1888 {
1889 if (dev->flags.notify) {
1890 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1891 acpi_video_device_notify);
1892 dev->flags.notify = 0;
1893 }
1894 }
1895
1896 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1897 {
1898 struct acpi_video_device *dev;
1899
1900 mutex_lock(&video->device_list_lock);
1901 list_for_each_entry(dev, &video->video_device_list, entry)
1902 acpi_video_dev_remove_notify_handler(dev);
1903 mutex_unlock(&video->device_list_lock);
1904
1905 acpi_video_bus_stop_devices(video);
1906 input_unregister_device(video->input);
1907 video->input = NULL;
1908 }
1909
1910 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1911 {
1912 struct acpi_video_device *dev, *next;
1913
1914 mutex_lock(&video->device_list_lock);
1915 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1916 list_del(&dev->entry);
1917 kfree(dev);
1918 }
1919 mutex_unlock(&video->device_list_lock);
1920
1921 return 0;
1922 }
1923
1924 static int instance;
1925
1926 static int acpi_video_bus_add(struct acpi_device *device)
1927 {
1928 struct acpi_video_bus *video;
1929 int error;
1930 acpi_status status;
1931
1932 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1933 device->parent->handle, 1,
1934 acpi_video_bus_match, NULL,
1935 device, NULL);
1936 if (status == AE_ALREADY_EXISTS) {
1937 printk(KERN_WARNING FW_BUG
1938 "Duplicate ACPI video bus devices for the"
1939 " same VGA controller, please try module "
1940 "parameter \"video.allow_duplicates=1\""
1941 "if the current driver doesn't work.\n");
1942 if (!allow_duplicates)
1943 return -ENODEV;
1944 }
1945
1946 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1947 if (!video)
1948 return -ENOMEM;
1949
1950 /* a hack to fix the duplicate name "VID" problem on T61 */
1951 if (!strcmp(device->pnp.bus_id, "VID")) {
1952 if (instance)
1953 device->pnp.bus_id[3] = '0' + instance;
1954 instance++;
1955 }
1956 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1957 if (!strcmp(device->pnp.bus_id, "VGA")) {
1958 if (instance)
1959 device->pnp.bus_id[3] = '0' + instance;
1960 instance++;
1961 }
1962
1963 video->device = device;
1964 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1965 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1966 device->driver_data = video;
1967
1968 acpi_video_bus_find_cap(video);
1969 error = acpi_video_bus_check(video);
1970 if (error)
1971 goto err_free_video;
1972
1973 mutex_init(&video->device_list_lock);
1974 INIT_LIST_HEAD(&video->video_device_list);
1975
1976 error = acpi_video_bus_get_devices(video, device);
1977 if (error)
1978 goto err_put_video;
1979
1980 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
1981 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1982 video->flags.multihead ? "yes" : "no",
1983 video->flags.rom ? "yes" : "no",
1984 video->flags.post ? "yes" : "no");
1985 mutex_lock(&video_list_lock);
1986 list_add_tail(&video->entry, &video_bus_head);
1987 mutex_unlock(&video_list_lock);
1988
1989 acpi_video_bus_register_backlight(video);
1990 acpi_video_bus_add_notify_handler(video);
1991
1992 return 0;
1993
1994 err_put_video:
1995 acpi_video_bus_put_devices(video);
1996 kfree(video->attached_array);
1997 err_free_video:
1998 kfree(video);
1999 device->driver_data = NULL;
2000
2001 return error;
2002 }
2003
2004 static int acpi_video_bus_remove(struct acpi_device *device)
2005 {
2006 struct acpi_video_bus *video = NULL;
2007
2008
2009 if (!device || !acpi_driver_data(device))
2010 return -EINVAL;
2011
2012 video = acpi_driver_data(device);
2013
2014 acpi_video_bus_remove_notify_handler(video);
2015 acpi_video_bus_unregister_backlight(video);
2016 acpi_video_bus_put_devices(video);
2017
2018 mutex_lock(&video_list_lock);
2019 list_del(&video->entry);
2020 mutex_unlock(&video_list_lock);
2021
2022 kfree(video->attached_array);
2023 kfree(video);
2024
2025 return 0;
2026 }
2027
2028 static int __init is_i740(struct pci_dev *dev)
2029 {
2030 if (dev->device == 0x00D1)
2031 return 1;
2032 if (dev->device == 0x7000)
2033 return 1;
2034 return 0;
2035 }
2036
2037 static int __init intel_opregion_present(void)
2038 {
2039 int opregion = 0;
2040 struct pci_dev *dev = NULL;
2041 u32 address;
2042
2043 for_each_pci_dev(dev) {
2044 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2045 continue;
2046 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2047 continue;
2048 /* We don't want to poke around undefined i740 registers */
2049 if (is_i740(dev))
2050 continue;
2051 pci_read_config_dword(dev, 0xfc, &address);
2052 if (!address)
2053 continue;
2054 opregion = 1;
2055 }
2056 return opregion;
2057 }
2058
2059 int acpi_video_register(void)
2060 {
2061 int ret = 0;
2062
2063 mutex_lock(&register_count_mutex);
2064 if (register_count) {
2065 /*
2066 * if the function of acpi_video_register is already called,
2067 * don't register the acpi_vide_bus again and return no error.
2068 */
2069 goto leave;
2070 }
2071
2072 dmi_check_system(video_dmi_table);
2073
2074 ret = acpi_bus_register_driver(&acpi_video_bus);
2075 if (ret)
2076 goto leave;
2077
2078 /*
2079 * When the acpi_video_bus is loaded successfully, increase
2080 * the counter reference.
2081 */
2082 register_count = 1;
2083
2084 leave:
2085 mutex_unlock(&register_count_mutex);
2086 return ret;
2087 }
2088 EXPORT_SYMBOL(acpi_video_register);
2089
2090 void acpi_video_unregister(void)
2091 {
2092 mutex_lock(&register_count_mutex);
2093 if (register_count) {
2094 acpi_bus_unregister_driver(&acpi_video_bus);
2095 register_count = 0;
2096 }
2097 mutex_unlock(&register_count_mutex);
2098 }
2099 EXPORT_SYMBOL(acpi_video_unregister);
2100
2101 void acpi_video_unregister_backlight(void)
2102 {
2103 struct acpi_video_bus *video;
2104
2105 mutex_lock(&register_count_mutex);
2106 if (register_count) {
2107 mutex_lock(&video_list_lock);
2108 list_for_each_entry(video, &video_bus_head, entry)
2109 acpi_video_bus_unregister_backlight(video);
2110 mutex_unlock(&video_list_lock);
2111 }
2112 mutex_unlock(&register_count_mutex);
2113 }
2114
2115 bool acpi_video_handles_brightness_key_presses(void)
2116 {
2117 bool have_video_busses;
2118
2119 mutex_lock(&video_list_lock);
2120 have_video_busses = !list_empty(&video_bus_head);
2121 mutex_unlock(&video_list_lock);
2122
2123 return have_video_busses &&
2124 (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS);
2125 }
2126 EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses);
2127
2128 /*
2129 * This is kind of nasty. Hardware using Intel chipsets may require
2130 * the video opregion code to be run first in order to initialise
2131 * state before any ACPI video calls are made. To handle this we defer
2132 * registration of the video class until the opregion code has run.
2133 */
2134
2135 static int __init acpi_video_init(void)
2136 {
2137 /*
2138 * Let the module load even if ACPI is disabled (e.g. due to
2139 * a broken BIOS) so that i915.ko can still be loaded on such
2140 * old systems without an AcpiOpRegion.
2141 *
2142 * acpi_video_register() will report -ENODEV later as well due
2143 * to acpi_disabled when i915.ko tries to register itself afterwards.
2144 */
2145 if (acpi_disabled)
2146 return 0;
2147
2148 if (intel_opregion_present())
2149 return 0;
2150
2151 return acpi_video_register();
2152 }
2153
2154 static void __exit acpi_video_exit(void)
2155 {
2156 acpi_video_detect_exit();
2157 acpi_video_unregister();
2158
2159 return;
2160 }
2161
2162 module_init(acpi_video_init);
2163 module_exit(acpi_video_exit);
Linux kernel - Deliverables
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