Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

Linux/drivers/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  *  You should have received a copy of the GNU General Public License along
 21  *  with this program; if not, write to the Free Software Foundation, Inc.,
 22  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 23  *
 24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 25  */
 26 
 27 #include <linux/kernel.h>
 28 #include <linux/module.h>
 29 #include <linux/init.h>
 30 #include <linux/types.h>
 31 #include <linux/list.h>
 32 #include <linux/mutex.h>
 33 #include <linux/input.h>
 34 #include <linux/backlight.h>
 35 #include <linux/thermal.h>
 36 #include <linux/sort.h>
 37 #include <linux/pci.h>
 38 #include <linux/pci_ids.h>
 39 #include <linux/slab.h>
 40 #include <linux/dmi.h>
 41 #include <linux/suspend.h>
 42 #include <linux/acpi.h>
 43 #include <acpi/video.h>
 44 #include <asm/uaccess.h>
 45 
 46 #include "internal.h"
 47 
 48 #define ACPI_VIDEO_BUS_NAME             "Video Bus"
 49 #define ACPI_VIDEO_DEVICE_NAME          "Video Device"
 50 #define ACPI_VIDEO_NOTIFY_SWITCH        0x80
 51 #define ACPI_VIDEO_NOTIFY_PROBE         0x81
 52 #define ACPI_VIDEO_NOTIFY_CYCLE         0x82
 53 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT   0x83
 54 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT   0x84
 55 
 56 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS      0x85
 57 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS        0x86
 58 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS        0x87
 59 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS       0x88
 60 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF           0x89
 61 
 62 #define MAX_NAME_LEN    20
 63 
 64 #define _COMPONENT              ACPI_VIDEO_COMPONENT
 65 ACPI_MODULE_NAME("video");
 66 
 67 MODULE_AUTHOR("Bruno Ducrot");
 68 MODULE_DESCRIPTION("ACPI Video Driver");
 69 MODULE_LICENSE("GPL");
 70 
 71 static bool brightness_switch_enabled = 1;
 72 module_param(brightness_switch_enabled, bool, 0644);
 73 
 74 /*
 75  * By default, we don't allow duplicate ACPI video bus devices
 76  * under the same VGA controller
 77  */
 78 static bool allow_duplicates;
 79 module_param(allow_duplicates, bool, 0644);
 80 
 81 /*
 82  * For Windows 8 systems: used to decide if video module
 83  * should skip registering backlight interface of its own.
 84  */
 85 static int use_native_backlight_param = 1;
 86 module_param_named(use_native_backlight, use_native_backlight_param, int, 0444);
 87 static bool use_native_backlight_dmi = false;
 88 
 89 static int register_count;
 90 static struct mutex video_list_lock;
 91 static struct list_head video_bus_head;
 92 static int acpi_video_bus_add(struct acpi_device *device);
 93 static int acpi_video_bus_remove(struct acpi_device *device);
 94 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
 95 
 96 static const struct acpi_device_id video_device_ids[] = {
 97         {ACPI_VIDEO_HID, 0},
 98         {"", 0},
 99 };
100 MODULE_DEVICE_TABLE(acpi, video_device_ids);
101 
102 static struct acpi_driver acpi_video_bus = {
103         .name = "video",
104         .class = ACPI_VIDEO_CLASS,
105         .ids = video_device_ids,
106         .ops = {
107                 .add = acpi_video_bus_add,
108                 .remove = acpi_video_bus_remove,
109                 .notify = acpi_video_bus_notify,
110                 },
111 };
112 
113 struct acpi_video_bus_flags {
114         u8 multihead:1;         /* can switch video heads */
115         u8 rom:1;               /* can retrieve a video rom */
116         u8 post:1;              /* can configure the head to */
117         u8 reserved:5;
118 };
119 
120 struct acpi_video_bus_cap {
121         u8 _DOS:1;              /* Enable/Disable output switching */
122         u8 _DOD:1;              /* Enumerate all devices attached to display adapter */
123         u8 _ROM:1;              /* Get ROM Data */
124         u8 _GPD:1;              /* Get POST Device */
125         u8 _SPD:1;              /* Set POST Device */
126         u8 _VPO:1;              /* Video POST Options */
127         u8 reserved:2;
128 };
129 
130 struct acpi_video_device_attrib {
131         u32 display_index:4;    /* A zero-based instance of the Display */
132         u32 display_port_attachment:4;  /* This field differentiates the display type */
133         u32 display_type:4;     /* Describe the specific type in use */
134         u32 vendor_specific:4;  /* Chipset Vendor Specific */
135         u32 bios_can_detect:1;  /* BIOS can detect the device */
136         u32 depend_on_vga:1;    /* Non-VGA output device whose power is related to
137                                    the VGA device. */
138         u32 pipe_id:3;          /* For VGA multiple-head devices. */
139         u32 reserved:10;        /* Must be 0 */
140         u32 device_id_scheme:1; /* Device ID Scheme */
141 };
142 
143 struct acpi_video_enumerated_device {
144         union {
145                 u32 int_val;
146                 struct acpi_video_device_attrib attrib;
147         } value;
148         struct acpi_video_device *bind_info;
149 };
150 
151 struct acpi_video_bus {
152         struct acpi_device *device;
153         bool backlight_registered;
154         bool backlight_notifier_registered;
155         u8 dos_setting;
156         struct acpi_video_enumerated_device *attached_array;
157         u8 attached_count;
158         struct acpi_video_bus_cap cap;
159         struct acpi_video_bus_flags flags;
160         struct list_head video_device_list;
161         struct mutex device_list_lock;  /* protects video_device_list */
162         struct list_head entry;
163         struct input_dev *input;
164         char phys[32];  /* for input device */
165         struct notifier_block pm_nb;
166         struct notifier_block backlight_nb;
167 };
168 
169 struct acpi_video_device_flags {
170         u8 crt:1;
171         u8 lcd:1;
172         u8 tvout:1;
173         u8 dvi:1;
174         u8 bios:1;
175         u8 unknown:1;
176         u8 notify:1;
177         u8 reserved:1;
178 };
179 
180 struct acpi_video_device_cap {
181         u8 _ADR:1;              /* Return the unique ID */
182         u8 _BCL:1;              /* Query list of brightness control levels supported */
183         u8 _BCM:1;              /* Set the brightness level */
184         u8 _BQC:1;              /* Get current brightness level */
185         u8 _BCQ:1;              /* Some buggy BIOS uses _BCQ instead of _BQC */
186         u8 _DDC:1;              /* Return the EDID for this device */
187 };
188 
189 struct acpi_video_brightness_flags {
190         u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
191         u8 _BCL_reversed:1;             /* _BCL package is in a reversed order */
192         u8 _BQC_use_index:1;            /* _BQC returns an index value */
193 };
194 
195 struct acpi_video_device_brightness {
196         int curr;
197         int count;
198         int *levels;
199         struct acpi_video_brightness_flags flags;
200 };
201 
202 struct acpi_video_device {
203         unsigned long device_id;
204         struct acpi_video_device_flags flags;
205         struct acpi_video_device_cap cap;
206         struct list_head entry;
207         struct acpi_video_bus *video;
208         struct acpi_device *dev;
209         struct acpi_video_device_brightness *brightness;
210         struct backlight_device *backlight;
211         struct thermal_cooling_device *cooling_dev;
212 };
213 
214 static const char device_decode[][30] = {
215         "motherboard VGA device",
216         "PCI VGA device",
217         "AGP VGA device",
218         "UNKNOWN",
219 };
220 
221 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
222 static void acpi_video_device_rebind(struct acpi_video_bus *video);
223 static void acpi_video_device_bind(struct acpi_video_bus *video,
224                                    struct acpi_video_device *device);
225 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
226 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
227                         int level);
228 static int acpi_video_device_lcd_get_level_current(
229                         struct acpi_video_device *device,
230                         unsigned long long *level, bool raw);
231 static int acpi_video_get_next_level(struct acpi_video_device *device,
232                                      u32 level_current, u32 event);
233 static int acpi_video_switch_brightness(struct acpi_video_device *device,
234                                          int event);
235 
236 static bool acpi_video_use_native_backlight(void)
237 {
238         if (use_native_backlight_param != -1)
239                 return use_native_backlight_param;
240         else
241                 return use_native_backlight_dmi;
242 }
243 
244 bool acpi_video_verify_backlight_support(void)
245 {
246         if (acpi_osi_is_win8() && acpi_video_use_native_backlight() &&
247             backlight_device_registered(BACKLIGHT_RAW))
248                 return false;
249         return acpi_video_backlight_support();
250 }
251 EXPORT_SYMBOL_GPL(acpi_video_verify_backlight_support);
252 
253 /* backlight device sysfs support */
254 static int acpi_video_get_brightness(struct backlight_device *bd)
255 {
256         unsigned long long cur_level;
257         int i;
258         struct acpi_video_device *vd = bl_get_data(bd);
259 
260         if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
261                 return -EINVAL;
262         for (i = 2; i < vd->brightness->count; i++) {
263                 if (vd->brightness->levels[i] == cur_level)
264                         /*
265                          * The first two entries are special - see page 575
266                          * of the ACPI spec 3.0
267                          */
268                         return i - 2;
269         }
270         return 0;
271 }
272 
273 static int acpi_video_set_brightness(struct backlight_device *bd)
274 {
275         int request_level = bd->props.brightness + 2;
276         struct acpi_video_device *vd = bl_get_data(bd);
277 
278         return acpi_video_device_lcd_set_level(vd,
279                                 vd->brightness->levels[request_level]);
280 }
281 
282 static const struct backlight_ops acpi_backlight_ops = {
283         .get_brightness = acpi_video_get_brightness,
284         .update_status  = acpi_video_set_brightness,
285 };
286 
287 /* thermal cooling device callbacks */
288 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
289                                long *state)
290 {
291         struct acpi_device *device = cooling_dev->devdata;
292         struct acpi_video_device *video = acpi_driver_data(device);
293 
294         *state = video->brightness->count - 3;
295         return 0;
296 }
297 
298 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
299                                long *state)
300 {
301         struct acpi_device *device = cooling_dev->devdata;
302         struct acpi_video_device *video = acpi_driver_data(device);
303         unsigned long long level;
304         int offset;
305 
306         if (acpi_video_device_lcd_get_level_current(video, &level, false))
307                 return -EINVAL;
308         for (offset = 2; offset < video->brightness->count; offset++)
309                 if (level == video->brightness->levels[offset]) {
310                         *state = video->brightness->count - offset - 1;
311                         return 0;
312                 }
313 
314         return -EINVAL;
315 }
316 
317 static int
318 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
319 {
320         struct acpi_device *device = cooling_dev->devdata;
321         struct acpi_video_device *video = acpi_driver_data(device);
322         int level;
323 
324         if (state >= video->brightness->count - 2)
325                 return -EINVAL;
326 
327         state = video->brightness->count - state;
328         level = video->brightness->levels[state - 1];
329         return acpi_video_device_lcd_set_level(video, level);
330 }
331 
332 static const struct thermal_cooling_device_ops video_cooling_ops = {
333         .get_max_state = video_get_max_state,
334         .get_cur_state = video_get_cur_state,
335         .set_cur_state = video_set_cur_state,
336 };
337 
338 /*
339  * --------------------------------------------------------------------------
340  *                             Video Management
341  * --------------------------------------------------------------------------
342  */
343 
344 static int
345 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
346                                    union acpi_object **levels)
347 {
348         int status;
349         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
350         union acpi_object *obj;
351 
352 
353         *levels = NULL;
354 
355         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
356         if (!ACPI_SUCCESS(status))
357                 return status;
358         obj = (union acpi_object *)buffer.pointer;
359         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
360                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
361                 status = -EFAULT;
362                 goto err;
363         }
364 
365         *levels = obj;
366 
367         return 0;
368 
369 err:
370         kfree(buffer.pointer);
371 
372         return status;
373 }
374 
375 static int
376 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
377 {
378         int status;
379         int state;
380 
381         status = acpi_execute_simple_method(device->dev->handle,
382                                             "_BCM", level);
383         if (ACPI_FAILURE(status)) {
384                 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
385                 return -EIO;
386         }
387 
388         device->brightness->curr = level;
389         for (state = 2; state < device->brightness->count; state++)
390                 if (level == device->brightness->levels[state]) {
391                         if (device->backlight)
392                                 device->backlight->props.brightness = state - 2;
393                         return 0;
394                 }
395 
396         ACPI_ERROR((AE_INFO, "Current brightness invalid"));
397         return -EINVAL;
398 }
399 
400 /*
401  * For some buggy _BQC methods, we need to add a constant value to
402  * the _BQC return value to get the actual current brightness level
403  */
404 
405 static int bqc_offset_aml_bug_workaround;
406 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
407 {
408         bqc_offset_aml_bug_workaround = 9;
409         return 0;
410 }
411 
412 static int __init video_set_use_native_backlight(const struct dmi_system_id *d)
413 {
414         use_native_backlight_dmi = true;
415         return 0;
416 }
417 
418 static struct dmi_system_id video_dmi_table[] __initdata = {
419         /*
420          * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
421          */
422         {
423          .callback = video_set_bqc_offset,
424          .ident = "Acer Aspire 5720",
425          .matches = {
426                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
427                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
428                 },
429         },
430         {
431          .callback = video_set_bqc_offset,
432          .ident = "Acer Aspire 5710Z",
433          .matches = {
434                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
435                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
436                 },
437         },
438         {
439          .callback = video_set_bqc_offset,
440          .ident = "eMachines E510",
441          .matches = {
442                 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
443                 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
444                 },
445         },
446         {
447          .callback = video_set_bqc_offset,
448          .ident = "Acer Aspire 5315",
449          .matches = {
450                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
451                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
452                 },
453         },
454         {
455          .callback = video_set_bqc_offset,
456          .ident = "Acer Aspire 7720",
457          .matches = {
458                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
459                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
460                 },
461         },
462         {
463          .callback = video_set_use_native_backlight,
464          .ident = "ThinkPad T430 and T430s",
465          .matches = {
466                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
467                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T430"),
468                 },
469         },
470         {
471          .callback = video_set_use_native_backlight,
472          .ident = "ThinkPad X230",
473          .matches = {
474                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
475                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X230"),
476                 },
477         },
478         {
479          .callback = video_set_use_native_backlight,
480          .ident = "ThinkPad W530",
481          .matches = {
482                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
483                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad W530"),
484                 },
485         },
486         {
487          .callback = video_set_use_native_backlight,
488         .ident = "ThinkPad X1 Carbon",
489         .matches = {
490                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
491                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X1 Carbon"),
492                 },
493         },
494         {
495          .callback = video_set_use_native_backlight,
496          .ident = "Lenovo Yoga 13",
497          .matches = {
498                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
499                 DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo IdeaPad Yoga 13"),
500                 },
501         },
502         {
503          .callback = video_set_use_native_backlight,
504          .ident = "Lenovo Yoga 2 11",
505          .matches = {
506                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
507                 DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo Yoga 2 11"),
508                 },
509         },
510         {
511         .callback = video_set_use_native_backlight,
512         .ident = "Thinkpad Helix",
513         .matches = {
514                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
515                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad Helix"),
516                 },
517         },
518         {
519          .callback = video_set_use_native_backlight,
520          .ident = "Dell Inspiron 7520",
521          .matches = {
522                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
523                 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7520"),
524                 },
525         },
526         {
527          .callback = video_set_use_native_backlight,
528          .ident = "Acer Aspire 5733Z",
529          .matches = {
530                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
531                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5733Z"),
532                 },
533         },
534         {
535          .callback = video_set_use_native_backlight,
536          .ident = "Acer Aspire 5742G",
537          .matches = {
538                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
539                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5742G"),
540                 },
541         },
542         {
543          .callback = video_set_use_native_backlight,
544          .ident = "Acer Aspire V5-171",
545          .matches = {
546                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
547                 DMI_MATCH(DMI_PRODUCT_NAME, "V5-171"),
548                 },
549         },
550         {
551          .callback = video_set_use_native_backlight,
552          .ident = "Acer Aspire V5-431",
553          .matches = {
554                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
555                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-431"),
556                 },
557         },
558         {
559          .callback = video_set_use_native_backlight,
560          .ident = "Acer Aspire V5-471G",
561          .matches = {
562                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
563                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-471G"),
564                 },
565         },
566         {
567          .callback = video_set_use_native_backlight,
568          .ident = "Acer TravelMate B113",
569          .matches = {
570                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
571                 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate B113"),
572                 },
573         },
574         {
575         .callback = video_set_use_native_backlight,
576         .ident = "HP ProBook 4340s",
577         .matches = {
578                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
579                 DMI_MATCH(DMI_PRODUCT_VERSION, "HP ProBook 4340s"),
580                 },
581         },
582         {
583         .callback = video_set_use_native_backlight,
584         .ident = "HP ProBook 4540s",
585         .matches = {
586                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
587                 DMI_MATCH(DMI_PRODUCT_VERSION, "HP ProBook 4540s"),
588                 },
589         },
590         {
591         .callback = video_set_use_native_backlight,
592         .ident = "HP ProBook 2013 models",
593         .matches = {
594                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
595                 DMI_MATCH(DMI_PRODUCT_NAME, "HP ProBook "),
596                 DMI_MATCH(DMI_PRODUCT_NAME, " G1"),
597                 },
598         },
599         {
600         .callback = video_set_use_native_backlight,
601         .ident = "HP EliteBook 2013 models",
602         .matches = {
603                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
604                 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook "),
605                 DMI_MATCH(DMI_PRODUCT_NAME, " G1"),
606                 },
607         },
608         {
609         .callback = video_set_use_native_backlight,
610         .ident = "HP ZBook 14",
611         .matches = {
612                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
613                 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 14"),
614                 },
615         },
616         {
617         .callback = video_set_use_native_backlight,
618         .ident = "HP ZBook 15",
619         .matches = {
620                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
621                 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 15"),
622                 },
623         },
624         {
625         .callback = video_set_use_native_backlight,
626         .ident = "HP ZBook 17",
627         .matches = {
628                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
629                 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 17"),
630                 },
631         },
632         {
633         .callback = video_set_use_native_backlight,
634         .ident = "HP EliteBook 8470p",
635         .matches = {
636                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
637                 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8470p"),
638                 },
639         },
640         {
641         .callback = video_set_use_native_backlight,
642         .ident = "HP EliteBook 8780w",
643         .matches = {
644                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
645                 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8780w"),
646                 },
647         },
648         {}
649 };
650 
651 static unsigned long long
652 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
653                               unsigned long long bqc_value)
654 {
655         unsigned long long level;
656 
657         if (device->brightness->flags._BQC_use_index) {
658                 /*
659                  * _BQC returns an index that doesn't account for
660                  * the first 2 items with special meaning, so we need
661                  * to compensate for that by offsetting ourselves
662                  */
663                 if (device->brightness->flags._BCL_reversed)
664                         bqc_value = device->brightness->count - 3 - bqc_value;
665 
666                 level = device->brightness->levels[bqc_value + 2];
667         } else {
668                 level = bqc_value;
669         }
670 
671         level += bqc_offset_aml_bug_workaround;
672 
673         return level;
674 }
675 
676 static int
677 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
678                                         unsigned long long *level, bool raw)
679 {
680         acpi_status status = AE_OK;
681         int i;
682 
683         if (device->cap._BQC || device->cap._BCQ) {
684                 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
685 
686                 status = acpi_evaluate_integer(device->dev->handle, buf,
687                                                 NULL, level);
688                 if (ACPI_SUCCESS(status)) {
689                         if (raw) {
690                                 /*
691                                  * Caller has indicated he wants the raw
692                                  * value returned by _BQC, so don't furtherly
693                                  * mess with the value.
694                                  */
695                                 return 0;
696                         }
697 
698                         *level = acpi_video_bqc_value_to_level(device, *level);
699 
700                         for (i = 2; i < device->brightness->count; i++)
701                                 if (device->brightness->levels[i] == *level) {
702                                         device->brightness->curr = *level;
703                                         return 0;
704                                 }
705                         /*
706                          * BQC returned an invalid level.
707                          * Stop using it.
708                          */
709                         ACPI_WARNING((AE_INFO,
710                                       "%s returned an invalid level",
711                                       buf));
712                         device->cap._BQC = device->cap._BCQ = 0;
713                 } else {
714                         /*
715                          * Fixme:
716                          * should we return an error or ignore this failure?
717                          * dev->brightness->curr is a cached value which stores
718                          * the correct current backlight level in most cases.
719                          * ACPI video backlight still works w/ buggy _BQC.
720                          * http://bugzilla.kernel.org/show_bug.cgi?id=12233
721                          */
722                         ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
723                         device->cap._BQC = device->cap._BCQ = 0;
724                 }
725         }
726 
727         *level = device->brightness->curr;
728         return 0;
729 }
730 
731 static int
732 acpi_video_device_EDID(struct acpi_video_device *device,
733                        union acpi_object **edid, ssize_t length)
734 {
735         int status;
736         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
737         union acpi_object *obj;
738         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
739         struct acpi_object_list args = { 1, &arg0 };
740 
741 
742         *edid = NULL;
743 
744         if (!device)
745                 return -ENODEV;
746         if (length == 128)
747                 arg0.integer.value = 1;
748         else if (length == 256)
749                 arg0.integer.value = 2;
750         else
751                 return -EINVAL;
752 
753         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
754         if (ACPI_FAILURE(status))
755                 return -ENODEV;
756 
757         obj = buffer.pointer;
758 
759         if (obj && obj->type == ACPI_TYPE_BUFFER)
760                 *edid = obj;
761         else {
762                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
763                 status = -EFAULT;
764                 kfree(obj);
765         }
766 
767         return status;
768 }
769 
770 /* bus */
771 
772 /*
773  *  Arg:
774  *      video           : video bus device pointer
775  *      bios_flag       :
776  *              0.      The system BIOS should NOT automatically switch(toggle)
777  *                      the active display output.
778  *              1.      The system BIOS should automatically switch (toggle) the
779  *                      active display output. No switch event.
780  *              2.      The _DGS value should be locked.
781  *              3.      The system BIOS should not automatically switch (toggle) the
782  *                      active display output, but instead generate the display switch
783  *                      event notify code.
784  *      lcd_flag        :
785  *              0.      The system BIOS should automatically control the brightness level
786  *                      of the LCD when the power changes from AC to DC
787  *              1.      The system BIOS should NOT automatically control the brightness
788  *                      level of the LCD when the power changes from AC to DC.
789  *  Return Value:
790  *              -EINVAL wrong arg.
791  */
792 
793 static int
794 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
795 {
796         acpi_status status;
797 
798         if (!video->cap._DOS)
799                 return 0;
800 
801         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
802                 return -EINVAL;
803         video->dos_setting = (lcd_flag << 2) | bios_flag;
804         status = acpi_execute_simple_method(video->device->handle, "_DOS",
805                                             (lcd_flag << 2) | bios_flag);
806         if (ACPI_FAILURE(status))
807                 return -EIO;
808 
809         return 0;
810 }
811 
812 /*
813  * Simple comparison function used to sort backlight levels.
814  */
815 
816 static int
817 acpi_video_cmp_level(const void *a, const void *b)
818 {
819         return *(int *)a - *(int *)b;
820 }
821 
822 /*
823  * Decides if _BQC/_BCQ for this system is usable
824  *
825  * We do this by changing the level first and then read out the current
826  * brightness level, if the value does not match, find out if it is using
827  * index. If not, clear the _BQC/_BCQ capability.
828  */
829 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
830                                 int max_level, int current_level)
831 {
832         struct acpi_video_device_brightness *br = device->brightness;
833         int result;
834         unsigned long long level;
835         int test_level;
836 
837         /* don't mess with existing known broken systems */
838         if (bqc_offset_aml_bug_workaround)
839                 return 0;
840 
841         /*
842          * Some systems always report current brightness level as maximum
843          * through _BQC, we need to test another value for them.
844          */
845         test_level = current_level == max_level ? br->levels[3] : max_level;
846 
847         result = acpi_video_device_lcd_set_level(device, test_level);
848         if (result)
849                 return result;
850 
851         result = acpi_video_device_lcd_get_level_current(device, &level, true);
852         if (result)
853                 return result;
854 
855         if (level != test_level) {
856                 /* buggy _BQC found, need to find out if it uses index */
857                 if (level < br->count) {
858                         if (br->flags._BCL_reversed)
859                                 level = br->count - 3 - level;
860                         if (br->levels[level + 2] == test_level)
861                                 br->flags._BQC_use_index = 1;
862                 }
863 
864                 if (!br->flags._BQC_use_index)
865                         device->cap._BQC = device->cap._BCQ = 0;
866         }
867 
868         return 0;
869 }
870 
871 
872 /*
873  *  Arg:
874  *      device  : video output device (LCD, CRT, ..)
875  *
876  *  Return Value:
877  *      Maximum brightness level
878  *
879  *  Allocate and initialize device->brightness.
880  */
881 
882 static int
883 acpi_video_init_brightness(struct acpi_video_device *device)
884 {
885         union acpi_object *obj = NULL;
886         int i, max_level = 0, count = 0, level_ac_battery = 0;
887         unsigned long long level, level_old;
888         union acpi_object *o;
889         struct acpi_video_device_brightness *br = NULL;
890         int result = -EINVAL;
891         u32 value;
892 
893         if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
894                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
895                                                 "LCD brightness level\n"));
896                 goto out;
897         }
898 
899         if (obj->package.count < 2)
900                 goto out;
901 
902         br = kzalloc(sizeof(*br), GFP_KERNEL);
903         if (!br) {
904                 printk(KERN_ERR "can't allocate memory\n");
905                 result = -ENOMEM;
906                 goto out;
907         }
908 
909         br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
910                                 GFP_KERNEL);
911         if (!br->levels) {
912                 result = -ENOMEM;
913                 goto out_free;
914         }
915 
916         for (i = 0; i < obj->package.count; i++) {
917                 o = (union acpi_object *)&obj->package.elements[i];
918                 if (o->type != ACPI_TYPE_INTEGER) {
919                         printk(KERN_ERR PREFIX "Invalid data\n");
920                         continue;
921                 }
922                 value = (u32) o->integer.value;
923                 /* Skip duplicate entries */
924                 if (count > 2 && br->levels[count - 1] == value)
925                         continue;
926 
927                 br->levels[count] = value;
928 
929                 if (br->levels[count] > max_level)
930                         max_level = br->levels[count];
931                 count++;
932         }
933 
934         /*
935          * some buggy BIOS don't export the levels
936          * when machine is on AC/Battery in _BCL package.
937          * In this case, the first two elements in _BCL packages
938          * are also supported brightness levels that OS should take care of.
939          */
940         for (i = 2; i < count; i++) {
941                 if (br->levels[i] == br->levels[0])
942                         level_ac_battery++;
943                 if (br->levels[i] == br->levels[1])
944                         level_ac_battery++;
945         }
946 
947         if (level_ac_battery < 2) {
948                 level_ac_battery = 2 - level_ac_battery;
949                 br->flags._BCL_no_ac_battery_levels = 1;
950                 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
951                         br->levels[i] = br->levels[i - level_ac_battery];
952                 count += level_ac_battery;
953         } else if (level_ac_battery > 2)
954                 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
955 
956         /* Check if the _BCL package is in a reversed order */
957         if (max_level == br->levels[2]) {
958                 br->flags._BCL_reversed = 1;
959                 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
960                         acpi_video_cmp_level, NULL);
961         } else if (max_level != br->levels[count - 1])
962                 ACPI_ERROR((AE_INFO,
963                             "Found unordered _BCL package"));
964 
965         br->count = count;
966         device->brightness = br;
967 
968         /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
969         br->curr = level = max_level;
970 
971         if (!device->cap._BQC)
972                 goto set_level;
973 
974         result = acpi_video_device_lcd_get_level_current(device,
975                                                          &level_old, true);
976         if (result)
977                 goto out_free_levels;
978 
979         result = acpi_video_bqc_quirk(device, max_level, level_old);
980         if (result)
981                 goto out_free_levels;
982         /*
983          * cap._BQC may get cleared due to _BQC is found to be broken
984          * in acpi_video_bqc_quirk, so check again here.
985          */
986         if (!device->cap._BQC)
987                 goto set_level;
988 
989         level = acpi_video_bqc_value_to_level(device, level_old);
990         /*
991          * On some buggy laptops, _BQC returns an uninitialized
992          * value when invoked for the first time, i.e.
993          * level_old is invalid (no matter whether it's a level
994          * or an index). Set the backlight to max_level in this case.
995          */
996         for (i = 2; i < br->count; i++)
997                 if (level == br->levels[i])
998                         break;
999         if (i == br->count || !level)
1000                 level = max_level;
1001 
1002 set_level:
1003         result = acpi_video_device_lcd_set_level(device, level);
1004         if (result)
1005                 goto out_free_levels;
1006 
1007         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1008                           "found %d brightness levels\n", count - 2));
1009         kfree(obj);
1010         return result;
1011 
1012 out_free_levels:
1013         kfree(br->levels);
1014 out_free:
1015         kfree(br);
1016 out:
1017         device->brightness = NULL;
1018         kfree(obj);
1019         return result;
1020 }
1021 
1022 /*
1023  *  Arg:
1024  *      device  : video output device (LCD, CRT, ..)
1025  *
1026  *  Return Value:
1027  *      None
1028  *
1029  *  Find out all required AML methods defined under the output
1030  *  device.
1031  */
1032 
1033 static void acpi_video_device_find_cap(struct acpi_video_device *device)
1034 {
1035         if (acpi_has_method(device->dev->handle, "_ADR"))
1036                 device->cap._ADR = 1;
1037         if (acpi_has_method(device->dev->handle, "_BCL"))
1038                 device->cap._BCL = 1;
1039         if (acpi_has_method(device->dev->handle, "_BCM"))
1040                 device->cap._BCM = 1;
1041         if (acpi_has_method(device->dev->handle, "_BQC")) {
1042                 device->cap._BQC = 1;
1043         } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
1044                 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
1045                 device->cap._BCQ = 1;
1046         }
1047 
1048         if (acpi_has_method(device->dev->handle, "_DDC"))
1049                 device->cap._DDC = 1;
1050 }
1051 
1052 /*
1053  *  Arg:
1054  *      device  : video output device (VGA)
1055  *
1056  *  Return Value:
1057  *      None
1058  *
1059  *  Find out all required AML methods defined under the video bus device.
1060  */
1061 
1062 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1063 {
1064         if (acpi_has_method(video->device->handle, "_DOS"))
1065                 video->cap._DOS = 1;
1066         if (acpi_has_method(video->device->handle, "_DOD"))
1067                 video->cap._DOD = 1;
1068         if (acpi_has_method(video->device->handle, "_ROM"))
1069                 video->cap._ROM = 1;
1070         if (acpi_has_method(video->device->handle, "_GPD"))
1071                 video->cap._GPD = 1;
1072         if (acpi_has_method(video->device->handle, "_SPD"))
1073                 video->cap._SPD = 1;
1074         if (acpi_has_method(video->device->handle, "_VPO"))
1075                 video->cap._VPO = 1;
1076 }
1077 
1078 /*
1079  * Check whether the video bus device has required AML method to
1080  * support the desired features
1081  */
1082 
1083 static int acpi_video_bus_check(struct acpi_video_bus *video)
1084 {
1085         acpi_status status = -ENOENT;
1086         struct pci_dev *dev;
1087 
1088         if (!video)
1089                 return -EINVAL;
1090 
1091         dev = acpi_get_pci_dev(video->device->handle);
1092         if (!dev)
1093                 return -ENODEV;
1094         pci_dev_put(dev);
1095 
1096         /*
1097          * Since there is no HID, CID and so on for VGA driver, we have
1098          * to check well known required nodes.
1099          */
1100 
1101         /* Does this device support video switching? */
1102         if (video->cap._DOS || video->cap._DOD) {
1103                 if (!video->cap._DOS) {
1104                         printk(KERN_WARNING FW_BUG
1105                                 "ACPI(%s) defines _DOD but not _DOS\n",
1106                                 acpi_device_bid(video->device));
1107                 }
1108                 video->flags.multihead = 1;
1109                 status = 0;
1110         }
1111 
1112         /* Does this device support retrieving a video ROM? */
1113         if (video->cap._ROM) {
1114                 video->flags.rom = 1;
1115                 status = 0;
1116         }
1117 
1118         /* Does this device support configuring which video device to POST? */
1119         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1120                 video->flags.post = 1;
1121                 status = 0;
1122         }
1123 
1124         return status;
1125 }
1126 
1127 /*
1128  * --------------------------------------------------------------------------
1129  *                               Driver Interface
1130  * --------------------------------------------------------------------------
1131  */
1132 
1133 /* device interface */
1134 static struct acpi_video_device_attrib *
1135 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1136 {
1137         struct acpi_video_enumerated_device *ids;
1138         int i;
1139 
1140         for (i = 0; i < video->attached_count; i++) {
1141                 ids = &video->attached_array[i];
1142                 if ((ids->value.int_val & 0xffff) == device_id)
1143                         return &ids->value.attrib;
1144         }
1145 
1146         return NULL;
1147 }
1148 
1149 static int
1150 acpi_video_get_device_type(struct acpi_video_bus *video,
1151                            unsigned long device_id)
1152 {
1153         struct acpi_video_enumerated_device *ids;
1154         int i;
1155 
1156         for (i = 0; i < video->attached_count; i++) {
1157                 ids = &video->attached_array[i];
1158                 if ((ids->value.int_val & 0xffff) == device_id)
1159                         return ids->value.int_val;
1160         }
1161 
1162         return 0;
1163 }
1164 
1165 static int
1166 acpi_video_bus_get_one_device(struct acpi_device *device,
1167                               struct acpi_video_bus *video)
1168 {
1169         unsigned long long device_id;
1170         int status, device_type;
1171         struct acpi_video_device *data;
1172         struct acpi_video_device_attrib *attribute;
1173 
1174         status =
1175             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1176         /* Some device omits _ADR, we skip them instead of fail */
1177         if (ACPI_FAILURE(status))
1178                 return 0;
1179 
1180         data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1181         if (!data)
1182                 return -ENOMEM;
1183 
1184         strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1185         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1186         device->driver_data = data;
1187 
1188         data->device_id = device_id;
1189         data->video = video;
1190         data->dev = device;
1191 
1192         attribute = acpi_video_get_device_attr(video, device_id);
1193 
1194         if (attribute && attribute->device_id_scheme) {
1195                 switch (attribute->display_type) {
1196                 case ACPI_VIDEO_DISPLAY_CRT:
1197                         data->flags.crt = 1;
1198                         break;
1199                 case ACPI_VIDEO_DISPLAY_TV:
1200                         data->flags.tvout = 1;
1201                         break;
1202                 case ACPI_VIDEO_DISPLAY_DVI:
1203                         data->flags.dvi = 1;
1204                         break;
1205                 case ACPI_VIDEO_DISPLAY_LCD:
1206                         data->flags.lcd = 1;
1207                         break;
1208                 default:
1209                         data->flags.unknown = 1;
1210                         break;
1211                 }
1212                 if (attribute->bios_can_detect)
1213                         data->flags.bios = 1;
1214         } else {
1215                 /* Check for legacy IDs */
1216                 device_type = acpi_video_get_device_type(video, device_id);
1217                 /* Ignore bits 16 and 18-20 */
1218                 switch (device_type & 0xffe2ffff) {
1219                 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1220                         data->flags.crt = 1;
1221                         break;
1222                 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1223                         data->flags.lcd = 1;
1224                         break;
1225                 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1226                         data->flags.tvout = 1;
1227                         break;
1228                 default:
1229                         data->flags.unknown = 1;
1230                 }
1231         }
1232 
1233         acpi_video_device_bind(video, data);
1234         acpi_video_device_find_cap(data);
1235 
1236         mutex_lock(&video->device_list_lock);
1237         list_add_tail(&data->entry, &video->video_device_list);
1238         mutex_unlock(&video->device_list_lock);
1239 
1240         return status;
1241 }
1242 
1243 /*
1244  *  Arg:
1245  *      video   : video bus device
1246  *
1247  *  Return:
1248  *      none
1249  *
1250  *  Enumerate the video device list of the video bus,
1251  *  bind the ids with the corresponding video devices
1252  *  under the video bus.
1253  */
1254 
1255 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1256 {
1257         struct acpi_video_device *dev;
1258 
1259         mutex_lock(&video->device_list_lock);
1260 
1261         list_for_each_entry(dev, &video->video_device_list, entry)
1262                 acpi_video_device_bind(video, dev);
1263 
1264         mutex_unlock(&video->device_list_lock);
1265 }
1266 
1267 /*
1268  *  Arg:
1269  *      video   : video bus device
1270  *      device  : video output device under the video
1271  *              bus
1272  *
1273  *  Return:
1274  *      none
1275  *
1276  *  Bind the ids with the corresponding video devices
1277  *  under the video bus.
1278  */
1279 
1280 static void
1281 acpi_video_device_bind(struct acpi_video_bus *video,
1282                        struct acpi_video_device *device)
1283 {
1284         struct acpi_video_enumerated_device *ids;
1285         int i;
1286 
1287         for (i = 0; i < video->attached_count; i++) {
1288                 ids = &video->attached_array[i];
1289                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1290                         ids->bind_info = device;
1291                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1292                 }
1293         }
1294 }
1295 
1296 /*
1297  *  Arg:
1298  *      video   : video bus device
1299  *
1300  *  Return:
1301  *      < 0     : error
1302  *
1303  *  Call _DOD to enumerate all devices attached to display adapter
1304  *
1305  */
1306 
1307 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1308 {
1309         int status;
1310         int count;
1311         int i;
1312         struct acpi_video_enumerated_device *active_list;
1313         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1314         union acpi_object *dod = NULL;
1315         union acpi_object *obj;
1316 
1317         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1318         if (!ACPI_SUCCESS(status)) {
1319                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1320                 return status;
1321         }
1322 
1323         dod = buffer.pointer;
1324         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1325                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1326                 status = -EFAULT;
1327                 goto out;
1328         }
1329 
1330         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1331                           dod->package.count));
1332 
1333         active_list = kcalloc(1 + dod->package.count,
1334                               sizeof(struct acpi_video_enumerated_device),
1335                               GFP_KERNEL);
1336         if (!active_list) {
1337                 status = -ENOMEM;
1338                 goto out;
1339         }
1340 
1341         count = 0;
1342         for (i = 0; i < dod->package.count; i++) {
1343                 obj = &dod->package.elements[i];
1344 
1345                 if (obj->type != ACPI_TYPE_INTEGER) {
1346                         printk(KERN_ERR PREFIX
1347                                 "Invalid _DOD data in element %d\n", i);
1348                         continue;
1349                 }
1350 
1351                 active_list[count].value.int_val = obj->integer.value;
1352                 active_list[count].bind_info = NULL;
1353                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1354                                   (int)obj->integer.value));
1355                 count++;
1356         }
1357 
1358         kfree(video->attached_array);
1359 
1360         video->attached_array = active_list;
1361         video->attached_count = count;
1362 
1363 out:
1364         kfree(buffer.pointer);
1365         return status;
1366 }
1367 
1368 static int
1369 acpi_video_get_next_level(struct acpi_video_device *device,
1370                           u32 level_current, u32 event)
1371 {
1372         int min, max, min_above, max_below, i, l, delta = 255;
1373         max = max_below = 0;
1374         min = min_above = 255;
1375         /* Find closest level to level_current */
1376         for (i = 2; i < device->brightness->count; i++) {
1377                 l = device->brightness->levels[i];
1378                 if (abs(l - level_current) < abs(delta)) {
1379                         delta = l - level_current;
1380                         if (!delta)
1381                                 break;
1382                 }
1383         }
1384         /* Ajust level_current to closest available level */
1385         level_current += delta;
1386         for (i = 2; i < device->brightness->count; i++) {
1387                 l = device->brightness->levels[i];
1388                 if (l < min)
1389                         min = l;
1390                 if (l > max)
1391                         max = l;
1392                 if (l < min_above && l > level_current)
1393                         min_above = l;
1394                 if (l > max_below && l < level_current)
1395                         max_below = l;
1396         }
1397 
1398         switch (event) {
1399         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1400                 return (level_current < max) ? min_above : min;
1401         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1402                 return (level_current < max) ? min_above : max;
1403         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1404                 return (level_current > min) ? max_below : min;
1405         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1406         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1407                 return 0;
1408         default:
1409                 return level_current;
1410         }
1411 }
1412 
1413 static int
1414 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1415 {
1416         unsigned long long level_current, level_next;
1417         int result = -EINVAL;
1418 
1419         /* no warning message if acpi_backlight=vendor or a quirk is used */
1420         if (!acpi_video_verify_backlight_support())
1421                 return 0;
1422 
1423         if (!device->brightness)
1424                 goto out;
1425 
1426         result = acpi_video_device_lcd_get_level_current(device,
1427                                                          &level_current,
1428                                                          false);
1429         if (result)
1430                 goto out;
1431 
1432         level_next = acpi_video_get_next_level(device, level_current, event);
1433 
1434         result = acpi_video_device_lcd_set_level(device, level_next);
1435 
1436         if (!result)
1437                 backlight_force_update(device->backlight,
1438                                        BACKLIGHT_UPDATE_HOTKEY);
1439 
1440 out:
1441         if (result)
1442                 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1443 
1444         return result;
1445 }
1446 
1447 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1448                         void **edid)
1449 {
1450         struct acpi_video_bus *video;
1451         struct acpi_video_device *video_device;
1452         union acpi_object *buffer = NULL;
1453         acpi_status status;
1454         int i, length;
1455 
1456         if (!device || !acpi_driver_data(device))
1457                 return -EINVAL;
1458 
1459         video = acpi_driver_data(device);
1460 
1461         for (i = 0; i < video->attached_count; i++) {
1462                 video_device = video->attached_array[i].bind_info;
1463                 length = 256;
1464 
1465                 if (!video_device)
1466                         continue;
1467 
1468                 if (!video_device->cap._DDC)
1469                         continue;
1470 
1471                 if (type) {
1472                         switch (type) {
1473                         case ACPI_VIDEO_DISPLAY_CRT:
1474                                 if (!video_device->flags.crt)
1475                                         continue;
1476                                 break;
1477                         case ACPI_VIDEO_DISPLAY_TV:
1478                                 if (!video_device->flags.tvout)
1479                                         continue;
1480                                 break;
1481                         case ACPI_VIDEO_DISPLAY_DVI:
1482                                 if (!video_device->flags.dvi)
1483                                         continue;
1484                                 break;
1485                         case ACPI_VIDEO_DISPLAY_LCD:
1486                                 if (!video_device->flags.lcd)
1487                                         continue;
1488                                 break;
1489                         }
1490                 } else if (video_device->device_id != device_id) {
1491                         continue;
1492                 }
1493 
1494                 status = acpi_video_device_EDID(video_device, &buffer, length);
1495 
1496                 if (ACPI_FAILURE(status) || !buffer ||
1497                     buffer->type != ACPI_TYPE_BUFFER) {
1498                         length = 128;
1499                         status = acpi_video_device_EDID(video_device, &buffer,
1500                                                         length);
1501                         if (ACPI_FAILURE(status) || !buffer ||
1502                             buffer->type != ACPI_TYPE_BUFFER) {
1503                                 continue;
1504                         }
1505                 }
1506 
1507                 *edid = buffer->buffer.pointer;
1508                 return length;
1509         }
1510 
1511         return -ENODEV;
1512 }
1513 EXPORT_SYMBOL(acpi_video_get_edid);
1514 
1515 static int
1516 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1517                            struct acpi_device *device)
1518 {
1519         int status = 0;
1520         struct acpi_device *dev;
1521 
1522         /*
1523          * There are systems where video module known to work fine regardless
1524          * of broken _DOD and ignoring returned value here doesn't cause
1525          * any issues later.
1526          */
1527         acpi_video_device_enumerate(video);
1528 
1529         list_for_each_entry(dev, &device->children, node) {
1530 
1531                 status = acpi_video_bus_get_one_device(dev, video);
1532                 if (status) {
1533                         dev_err(&dev->dev, "Can't attach device\n");
1534                         break;
1535                 }
1536         }
1537         return status;
1538 }
1539 
1540 /* acpi_video interface */
1541 
1542 /*
1543  * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1544  * preform any automatic brightness change on receiving a notification.
1545  */
1546 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1547 {
1548         return acpi_video_bus_DOS(video, 0,
1549                                   acpi_osi_is_win8() ? 1 : 0);
1550 }
1551 
1552 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1553 {
1554         return acpi_video_bus_DOS(video, 0,
1555                                   acpi_osi_is_win8() ? 0 : 1);
1556 }
1557 
1558 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1559 {
1560         struct acpi_video_bus *video = acpi_driver_data(device);
1561         struct input_dev *input;
1562         int keycode = 0;
1563 
1564         if (!video || !video->input)
1565                 return;
1566 
1567         input = video->input;
1568 
1569         switch (event) {
1570         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
1571                                          * most likely via hotkey. */
1572                 keycode = KEY_SWITCHVIDEOMODE;
1573                 break;
1574 
1575         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
1576                                          * connector. */
1577                 acpi_video_device_enumerate(video);
1578                 acpi_video_device_rebind(video);
1579                 keycode = KEY_SWITCHVIDEOMODE;
1580                 break;
1581 
1582         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1583                 keycode = KEY_SWITCHVIDEOMODE;
1584                 break;
1585         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1586                 keycode = KEY_VIDEO_NEXT;
1587                 break;
1588         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1589                 keycode = KEY_VIDEO_PREV;
1590                 break;
1591 
1592         default:
1593                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1594                                   "Unsupported event [0x%x]\n", event));
1595                 break;
1596         }
1597 
1598         if (acpi_notifier_call_chain(device, event, 0))
1599                 /* Something vetoed the keypress. */
1600                 keycode = 0;
1601 
1602         if (keycode) {
1603                 input_report_key(input, keycode, 1);
1604                 input_sync(input);
1605                 input_report_key(input, keycode, 0);
1606                 input_sync(input);
1607         }
1608 
1609         return;
1610 }
1611 
1612 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1613 {
1614         struct acpi_video_device *video_device = data;
1615         struct acpi_device *device = NULL;
1616         struct acpi_video_bus *bus;
1617         struct input_dev *input;
1618         int keycode = 0;
1619 
1620         if (!video_device)
1621                 return;
1622 
1623         device = video_device->dev;
1624         bus = video_device->video;
1625         input = bus->input;
1626 
1627         switch (event) {
1628         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1629                 if (brightness_switch_enabled)
1630                         acpi_video_switch_brightness(video_device, event);
1631                 keycode = KEY_BRIGHTNESS_CYCLE;
1632                 break;
1633         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1634                 if (brightness_switch_enabled)
1635                         acpi_video_switch_brightness(video_device, event);
1636                 keycode = KEY_BRIGHTNESSUP;
1637                 break;
1638         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1639                 if (brightness_switch_enabled)
1640                         acpi_video_switch_brightness(video_device, event);
1641                 keycode = KEY_BRIGHTNESSDOWN;
1642                 break;
1643         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1644                 if (brightness_switch_enabled)
1645                         acpi_video_switch_brightness(video_device, event);
1646                 keycode = KEY_BRIGHTNESS_ZERO;
1647                 break;
1648         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1649                 if (brightness_switch_enabled)
1650                         acpi_video_switch_brightness(video_device, event);
1651                 keycode = KEY_DISPLAY_OFF;
1652                 break;
1653         default:
1654                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1655                                   "Unsupported event [0x%x]\n", event));
1656                 break;
1657         }
1658 
1659         acpi_notifier_call_chain(device, event, 0);
1660 
1661         if (keycode) {
1662                 input_report_key(input, keycode, 1);
1663                 input_sync(input);
1664                 input_report_key(input, keycode, 0);
1665                 input_sync(input);
1666         }
1667 
1668         return;
1669 }
1670 
1671 static int acpi_video_resume(struct notifier_block *nb,
1672                                 unsigned long val, void *ign)
1673 {
1674         struct acpi_video_bus *video;
1675         struct acpi_video_device *video_device;
1676         int i;
1677 
1678         switch (val) {
1679         case PM_HIBERNATION_PREPARE:
1680         case PM_SUSPEND_PREPARE:
1681         case PM_RESTORE_PREPARE:
1682                 return NOTIFY_DONE;
1683         }
1684 
1685         video = container_of(nb, struct acpi_video_bus, pm_nb);
1686 
1687         dev_info(&video->device->dev, "Restoring backlight state\n");
1688 
1689         for (i = 0; i < video->attached_count; i++) {
1690                 video_device = video->attached_array[i].bind_info;
1691                 if (video_device && video_device->backlight)
1692                         acpi_video_set_brightness(video_device->backlight);
1693         }
1694 
1695         return NOTIFY_OK;
1696 }
1697 
1698 static acpi_status
1699 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1700                         void **return_value)
1701 {
1702         struct acpi_device *device = context;
1703         struct acpi_device *sibling;
1704         int result;
1705 
1706         if (handle == device->handle)
1707                 return AE_CTRL_TERMINATE;
1708 
1709         result = acpi_bus_get_device(handle, &sibling);
1710         if (result)
1711                 return AE_OK;
1712 
1713         if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1714                         return AE_ALREADY_EXISTS;
1715 
1716         return AE_OK;
1717 }
1718 
1719 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1720 {
1721         struct backlight_properties props;
1722         struct pci_dev *pdev;
1723         acpi_handle acpi_parent;
1724         struct device *parent = NULL;
1725         int result;
1726         static int count;
1727         char *name;
1728 
1729         result = acpi_video_init_brightness(device);
1730         if (result)
1731                 return;
1732         name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1733         if (!name)
1734                 return;
1735         count++;
1736 
1737         acpi_get_parent(device->dev->handle, &acpi_parent);
1738 
1739         pdev = acpi_get_pci_dev(acpi_parent);
1740         if (pdev) {
1741                 parent = &pdev->dev;
1742                 pci_dev_put(pdev);
1743         }
1744 
1745         memset(&props, 0, sizeof(struct backlight_properties));
1746         props.type = BACKLIGHT_FIRMWARE;
1747         props.max_brightness = device->brightness->count - 3;
1748         device->backlight = backlight_device_register(name,
1749                                                       parent,
1750                                                       device,
1751                                                       &acpi_backlight_ops,
1752                                                       &props);
1753         kfree(name);
1754         if (IS_ERR(device->backlight))
1755                 return;
1756 
1757         /*
1758          * Save current brightness level in case we have to restore it
1759          * before acpi_video_device_lcd_set_level() is called next time.
1760          */
1761         device->backlight->props.brightness =
1762                         acpi_video_get_brightness(device->backlight);
1763 
1764         device->cooling_dev = thermal_cooling_device_register("LCD",
1765                                 device->dev, &video_cooling_ops);
1766         if (IS_ERR(device->cooling_dev)) {
1767                 /*
1768                  * Set cooling_dev to NULL so we don't crash trying to free it.
1769                  * Also, why the hell we are returning early and not attempt to
1770                  * register video output if cooling device registration failed?
1771                  * -- dtor
1772                  */
1773                 device->cooling_dev = NULL;
1774                 return;
1775         }
1776 
1777         dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1778                  device->cooling_dev->id);
1779         result = sysfs_create_link(&device->dev->dev.kobj,
1780                         &device->cooling_dev->device.kobj,
1781                         "thermal_cooling");
1782         if (result)
1783                 printk(KERN_ERR PREFIX "Create sysfs link\n");
1784         result = sysfs_create_link(&device->cooling_dev->device.kobj,
1785                         &device->dev->dev.kobj, "device");
1786         if (result)
1787                 printk(KERN_ERR PREFIX "Create sysfs link\n");
1788 }
1789 
1790 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1791 {
1792         struct acpi_video_device *dev;
1793 
1794         if (video->backlight_registered)
1795                 return 0;
1796 
1797         if (!acpi_video_verify_backlight_support())
1798                 return 0;
1799 
1800         mutex_lock(&video->device_list_lock);
1801         list_for_each_entry(dev, &video->video_device_list, entry)
1802                 acpi_video_dev_register_backlight(dev);
1803         mutex_unlock(&video->device_list_lock);
1804 
1805         video->backlight_registered = true;
1806 
1807         video->pm_nb.notifier_call = acpi_video_resume;
1808         video->pm_nb.priority = 0;
1809         return register_pm_notifier(&video->pm_nb);
1810 }
1811 
1812 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1813 {
1814         if (device->backlight) {
1815                 backlight_device_unregister(device->backlight);
1816                 device->backlight = NULL;
1817         }
1818         if (device->brightness) {
1819                 kfree(device->brightness->levels);
1820                 kfree(device->brightness);
1821                 device->brightness = NULL;
1822         }
1823         if (device->cooling_dev) {
1824                 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1825                 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1826                 thermal_cooling_device_unregister(device->cooling_dev);
1827                 device->cooling_dev = NULL;
1828         }
1829 }
1830 
1831 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1832 {
1833         struct acpi_video_device *dev;
1834         int error;
1835 
1836         if (!video->backlight_registered)
1837                 return 0;
1838 
1839         error = unregister_pm_notifier(&video->pm_nb);
1840 
1841         mutex_lock(&video->device_list_lock);
1842         list_for_each_entry(dev, &video->video_device_list, entry)
1843                 acpi_video_dev_unregister_backlight(dev);
1844         mutex_unlock(&video->device_list_lock);
1845 
1846         video->backlight_registered = false;
1847 
1848         return error;
1849 }
1850 
1851 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1852 {
1853         acpi_status status;
1854         struct acpi_device *adev = device->dev;
1855 
1856         status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1857                                              acpi_video_device_notify, device);
1858         if (ACPI_FAILURE(status))
1859                 dev_err(&adev->dev, "Error installing notify handler\n");
1860         else
1861                 device->flags.notify = 1;
1862 }
1863 
1864 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1865 {
1866         struct input_dev *input;
1867         struct acpi_video_device *dev;
1868         int error;
1869 
1870         video->input = input = input_allocate_device();
1871         if (!input) {
1872                 error = -ENOMEM;
1873                 goto out;
1874         }
1875 
1876         error = acpi_video_bus_start_devices(video);
1877         if (error)
1878                 goto err_free_input;
1879 
1880         snprintf(video->phys, sizeof(video->phys),
1881                         "%s/video/input0", acpi_device_hid(video->device));
1882 
1883         input->name = acpi_device_name(video->device);
1884         input->phys = video->phys;
1885         input->id.bustype = BUS_HOST;
1886         input->id.product = 0x06;
1887         input->dev.parent = &video->device->dev;
1888         input->evbit[0] = BIT(EV_KEY);
1889         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1890         set_bit(KEY_VIDEO_NEXT, input->keybit);
1891         set_bit(KEY_VIDEO_PREV, input->keybit);
1892         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1893         set_bit(KEY_BRIGHTNESSUP, input->keybit);
1894         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1895         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1896         set_bit(KEY_DISPLAY_OFF, input->keybit);
1897 
1898         error = input_register_device(input);
1899         if (error)
1900                 goto err_stop_dev;
1901 
1902         mutex_lock(&video->device_list_lock);
1903         list_for_each_entry(dev, &video->video_device_list, entry)
1904                 acpi_video_dev_add_notify_handler(dev);
1905         mutex_unlock(&video->device_list_lock);
1906 
1907         return 0;
1908 
1909 err_stop_dev:
1910         acpi_video_bus_stop_devices(video);
1911 err_free_input:
1912         input_free_device(input);
1913         video->input = NULL;
1914 out:
1915         return error;
1916 }
1917 
1918 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1919 {
1920         if (dev->flags.notify) {
1921                 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1922                                            acpi_video_device_notify);
1923                 dev->flags.notify = 0;
1924         }
1925 }
1926 
1927 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1928 {
1929         struct acpi_video_device *dev;
1930 
1931         mutex_lock(&video->device_list_lock);
1932         list_for_each_entry(dev, &video->video_device_list, entry)
1933                 acpi_video_dev_remove_notify_handler(dev);
1934         mutex_unlock(&video->device_list_lock);
1935 
1936         acpi_video_bus_stop_devices(video);
1937         input_unregister_device(video->input);
1938         video->input = NULL;
1939 }
1940 
1941 static int acpi_video_backlight_notify(struct notifier_block *nb,
1942                                         unsigned long val, void *bd)
1943 {
1944         struct backlight_device *backlight = bd;
1945         struct acpi_video_bus *video;
1946 
1947         /* acpi_video_verify_backlight_support only cares about raw devices */
1948         if (backlight->props.type != BACKLIGHT_RAW)
1949                 return NOTIFY_DONE;
1950 
1951         video = container_of(nb, struct acpi_video_bus, backlight_nb);
1952 
1953         switch (val) {
1954         case BACKLIGHT_REGISTERED:
1955                 if (!acpi_video_verify_backlight_support())
1956                         acpi_video_bus_unregister_backlight(video);
1957                 break;
1958         case BACKLIGHT_UNREGISTERED:
1959                 acpi_video_bus_register_backlight(video);
1960                 break;
1961         }
1962 
1963         return NOTIFY_OK;
1964 }
1965 
1966 static int acpi_video_bus_add_backlight_notify_handler(
1967                                                 struct acpi_video_bus *video)
1968 {
1969         int error;
1970 
1971         video->backlight_nb.notifier_call = acpi_video_backlight_notify;
1972         video->backlight_nb.priority = 0;
1973         error = backlight_register_notifier(&video->backlight_nb);
1974         if (error == 0)
1975                 video->backlight_notifier_registered = true;
1976 
1977         return error;
1978 }
1979 
1980 static int acpi_video_bus_remove_backlight_notify_handler(
1981                                                 struct acpi_video_bus *video)
1982 {
1983         if (!video->backlight_notifier_registered)
1984                 return 0;
1985 
1986         video->backlight_notifier_registered = false;
1987 
1988         return backlight_unregister_notifier(&video->backlight_nb);
1989 }
1990 
1991 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1992 {
1993         struct acpi_video_device *dev, *next;
1994 
1995         mutex_lock(&video->device_list_lock);
1996         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1997                 list_del(&dev->entry);
1998                 kfree(dev);
1999         }
2000         mutex_unlock(&video->device_list_lock);
2001 
2002         return 0;
2003 }
2004 
2005 static int instance;
2006 
2007 static int acpi_video_bus_add(struct acpi_device *device)
2008 {
2009         struct acpi_video_bus *video;
2010         int error;
2011         acpi_status status;
2012 
2013         status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
2014                                 device->parent->handle, 1,
2015                                 acpi_video_bus_match, NULL,
2016                                 device, NULL);
2017         if (status == AE_ALREADY_EXISTS) {
2018                 printk(KERN_WARNING FW_BUG
2019                         "Duplicate ACPI video bus devices for the"
2020                         " same VGA controller, please try module "
2021                         "parameter \"video.allow_duplicates=1\""
2022                         "if the current driver doesn't work.\n");
2023                 if (!allow_duplicates)
2024                         return -ENODEV;
2025         }
2026 
2027         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2028         if (!video)
2029                 return -ENOMEM;
2030 
2031         /* a hack to fix the duplicate name "VID" problem on T61 */
2032         if (!strcmp(device->pnp.bus_id, "VID")) {
2033                 if (instance)
2034                         device->pnp.bus_id[3] = '' + instance;
2035                 instance++;
2036         }
2037         /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2038         if (!strcmp(device->pnp.bus_id, "VGA")) {
2039                 if (instance)
2040                         device->pnp.bus_id[3] = '' + instance;
2041                 instance++;
2042         }
2043 
2044         video->device = device;
2045         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2046         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2047         device->driver_data = video;
2048 
2049         acpi_video_bus_find_cap(video);
2050         error = acpi_video_bus_check(video);
2051         if (error)
2052                 goto err_free_video;
2053 
2054         mutex_init(&video->device_list_lock);
2055         INIT_LIST_HEAD(&video->video_device_list);
2056 
2057         error = acpi_video_bus_get_devices(video, device);
2058         if (error)
2059                 goto err_put_video;
2060 
2061         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
2062                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2063                video->flags.multihead ? "yes" : "no",
2064                video->flags.rom ? "yes" : "no",
2065                video->flags.post ? "yes" : "no");
2066         mutex_lock(&video_list_lock);
2067         list_add_tail(&video->entry, &video_bus_head);
2068         mutex_unlock(&video_list_lock);
2069 
2070         acpi_video_bus_register_backlight(video);
2071         acpi_video_bus_add_notify_handler(video);
2072         acpi_video_bus_add_backlight_notify_handler(video);
2073 
2074         return 0;
2075 
2076 err_put_video:
2077         acpi_video_bus_put_devices(video);
2078         kfree(video->attached_array);
2079 err_free_video:
2080         kfree(video);
2081         device->driver_data = NULL;
2082 
2083         return error;
2084 }
2085 
2086 static int acpi_video_bus_remove(struct acpi_device *device)
2087 {
2088         struct acpi_video_bus *video = NULL;
2089 
2090 
2091         if (!device || !acpi_driver_data(device))
2092                 return -EINVAL;
2093 
2094         video = acpi_driver_data(device);
2095 
2096         acpi_video_bus_remove_backlight_notify_handler(video);
2097         acpi_video_bus_remove_notify_handler(video);
2098         acpi_video_bus_unregister_backlight(video);
2099         acpi_video_bus_put_devices(video);
2100 
2101         mutex_lock(&video_list_lock);
2102         list_del(&video->entry);
2103         mutex_unlock(&video_list_lock);
2104 
2105         kfree(video->attached_array);
2106         kfree(video);
2107 
2108         return 0;
2109 }
2110 
2111 static int __init is_i740(struct pci_dev *dev)
2112 {
2113         if (dev->device == 0x00D1)
2114                 return 1;
2115         if (dev->device == 0x7000)
2116                 return 1;
2117         return 0;
2118 }
2119 
2120 static int __init intel_opregion_present(void)
2121 {
2122         int opregion = 0;
2123         struct pci_dev *dev = NULL;
2124         u32 address;
2125 
2126         for_each_pci_dev(dev) {
2127                 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2128                         continue;
2129                 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2130                         continue;
2131                 /* We don't want to poke around undefined i740 registers */
2132                 if (is_i740(dev))
2133                         continue;
2134                 pci_read_config_dword(dev, 0xfc, &address);
2135                 if (!address)
2136                         continue;
2137                 opregion = 1;
2138         }
2139         return opregion;
2140 }
2141 
2142 int acpi_video_register(void)
2143 {
2144         int result = 0;
2145         if (register_count) {
2146                 /*
2147                  * if the function of acpi_video_register is already called,
2148                  * don't register the acpi_vide_bus again and return no error.
2149                  */
2150                 return 0;
2151         }
2152 
2153         mutex_init(&video_list_lock);
2154         INIT_LIST_HEAD(&video_bus_head);
2155 
2156         result = acpi_bus_register_driver(&acpi_video_bus);
2157         if (result < 0)
2158                 return -ENODEV;
2159 
2160         /*
2161          * When the acpi_video_bus is loaded successfully, increase
2162          * the counter reference.
2163          */
2164         register_count = 1;
2165 
2166         return 0;
2167 }
2168 EXPORT_SYMBOL(acpi_video_register);
2169 
2170 void acpi_video_unregister(void)
2171 {
2172         if (!register_count) {
2173                 /*
2174                  * If the acpi video bus is already unloaded, don't
2175                  * unload it again and return directly.
2176                  */
2177                 return;
2178         }
2179         acpi_bus_unregister_driver(&acpi_video_bus);
2180 
2181         register_count = 0;
2182 
2183         return;
2184 }
2185 EXPORT_SYMBOL(acpi_video_unregister);
2186 
2187 void acpi_video_unregister_backlight(void)
2188 {
2189         struct acpi_video_bus *video;
2190 
2191         if (!register_count)
2192                 return;
2193 
2194         mutex_lock(&video_list_lock);
2195         list_for_each_entry(video, &video_bus_head, entry)
2196                 acpi_video_bus_unregister_backlight(video);
2197         mutex_unlock(&video_list_lock);
2198 }
2199 EXPORT_SYMBOL(acpi_video_unregister_backlight);
2200 
2201 /*
2202  * This is kind of nasty. Hardware using Intel chipsets may require
2203  * the video opregion code to be run first in order to initialise
2204  * state before any ACPI video calls are made. To handle this we defer
2205  * registration of the video class until the opregion code has run.
2206  */
2207 
2208 static int __init acpi_video_init(void)
2209 {
2210         dmi_check_system(video_dmi_table);
2211 
2212         if (intel_opregion_present())
2213                 return 0;
2214 
2215         return acpi_video_register();
2216 }
2217 
2218 static void __exit acpi_video_exit(void)
2219 {
2220         acpi_video_unregister();
2221 
2222         return;
2223 }
2224 
2225 module_init(acpi_video_init);
2226 module_exit(acpi_video_exit);
2227 

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