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[deliverable/linux.git] / drivers / acpi / video.c
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1da177e4 1/*
21fcb34e 2 * video.c - ACPI Video Driver
1da177e4
LT		 3 *
4 * Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
5 * Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
f4715189 6 * Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
1da177e4
LT		 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>
bbac81f5 32#include <linux/mutex.h>
e9dab196 33#include <linux/input.h>
2f3d000a 34#include <linux/backlight.h>
702ed512 35#include <linux/thermal.h>
935e5f29 36#include <linux/sort.h>
74a365b3
MG		 37#include <linux/pci.h>
38#include <linux/pci_ids.h>
5a0e3ad6 39#include <linux/slab.h>
eb27cae8 40#include <linux/dmi.h>
ac7729da 41#include <linux/suspend.h>
8b48463f 42#include <linux/acpi.h>
e92a7162 43#include <acpi/video.h>
8b48463f 44#include <asm/uaccess.h>
1da177e4 45
8c5bd7ad
RW		 46#include "internal.h"
47
1da177e4
LT		 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
f4715189
TT		 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
1da177e4 61
2f3d000a 62#define MAX_NAME_LEN 20
1da177e4 63
1da177e4 64#define _COMPONENT ACPI_VIDEO_COMPONENT
f52fd66d 65ACPI_MODULE_NAME("video");
1da177e4 66
f52fd66d 67MODULE_AUTHOR("Bruno Ducrot");
7cda93e0 68MODULE_DESCRIPTION("ACPI Video Driver");
1da177e4
LT		 69MODULE_LICENSE("GPL");
70
886129a8 71static bool brightness_switch_enabled;
8a681a4d
ZR		 72module_param(brightness_switch_enabled, bool, 0644);
73
c504f8cb
ZR		 74/*
75 * By default, we don't allow duplicate ACPI video bus devices
76 * under the same VGA controller
77 */
90ab5ee9 78static bool allow_duplicates;
c504f8cb
ZR		 79module_param(allow_duplicates, bool, 0644);
80
fbc9fe1b 81/*
0e9f81d3
AL		 82 * For Windows 8 systems: used to decide if video module
83 * should skip registering backlight interface of its own.
fbc9fe1b 84 */
751109aa 85static int use_native_backlight_param = 1;
0e9f81d3
AL		 86module_param_named(use_native_backlight, use_native_backlight_param, int, 0444);
87static bool use_native_backlight_dmi = false;
fbc9fe1b 88
915ea7e4 89static int register_count;
67b662e1
AL		 90static struct mutex video_list_lock;
91static struct list_head video_bus_head;
4be44fcd 92static int acpi_video_bus_add(struct acpi_device *device);
51fac838 93static int acpi_video_bus_remove(struct acpi_device *device);
7015558f 94static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
1da177e4 95
1ba90e3a
TR		 96static const struct acpi_device_id video_device_ids[] = {
97 {ACPI_VIDEO_HID, 0},
98 {"", 0},
99};
100MODULE_DEVICE_TABLE(acpi, video_device_ids);
101
1da177e4 102static struct acpi_driver acpi_video_bus = {
c2b6705b 103 .name = "video",
1da177e4 104 .class = ACPI_VIDEO_CLASS,
1ba90e3a 105 .ids = video_device_ids,
1da177e4
LT		 106 .ops = {
107 .add = acpi_video_bus_add,
108 .remove = acpi_video_bus_remove,
7015558f 109 .notify = acpi_video_bus_notify,
4be44fcd 110 },
1da177e4
LT		 111};
112
113struct acpi_video_bus_flags {
4be44fcd
LB		 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;
1da177e4
LT		 118};
119
120struct acpi_video_bus_cap {
21fcb34e
FC		 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 */
4be44fcd 127 u8 reserved:2;
1da177e4
LT		 128};
129
4be44fcd
LB		 130struct acpi_video_device_attrib {
131 u32 display_index:4; /* A zero-based instance of the Display */
21fcb34e
FC		 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
4be44fcd 137 the VGA device. */
21fcb34e
FC		 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 */
1da177e4
LT		 141};
142
143struct acpi_video_enumerated_device {
144 union {
145 u32 int_val;
4be44fcd 146 struct acpi_video_device_attrib attrib;
1da177e4
LT		 147 } value;
148 struct acpi_video_device *bind_info;
149};
150
151struct acpi_video_bus {
e6afa0de 152 struct acpi_device *device;
99678ed7 153 bool backlight_registered;
53a92ba7 154 bool backlight_notifier_registered;
4be44fcd 155 u8 dos_setting;
1da177e4 156 struct acpi_video_enumerated_device *attached_array;
4be44fcd
LB		 157 u8 attached_count;
158 struct acpi_video_bus_cap cap;
1da177e4 159 struct acpi_video_bus_flags flags;
4be44fcd 160 struct list_head video_device_list;
bbac81f5 161 struct mutex device_list_lock; /* protects video_device_list */
67b662e1 162 struct list_head entry;
e9dab196
LY		 163 struct input_dev *input;
164 char phys[32]; /* for input device */
ac7729da 165 struct notifier_block pm_nb;
53a92ba7 166 struct notifier_block backlight_nb;
1da177e4
LT		 167};
168
169struct acpi_video_device_flags {
4be44fcd
LB		 170 u8 crt:1;
171 u8 lcd:1;
172 u8 tvout:1;
82cae999 173 u8 dvi:1;
4be44fcd
LB		 174 u8 bios:1;
175 u8 unknown:1;
91e13aa3
AL		 176 u8 notify:1;
177 u8 reserved:1;
1da177e4
LT		 178};
179
180struct acpi_video_device_cap {
21fcb34e
FC		 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 */
2f3d000a 184 u8 _BQC:1; /* Get current brightness level */
c60d638e 185 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
21fcb34e 186 u8 _DDC:1; /* Return the EDID for this device */
1da177e4
LT		 187};
188
d32f6947
ZR		 189struct acpi_video_brightness_flags {
190 u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
21fcb34e 191 u8 _BCL_reversed:1; /* _BCL package is in a reversed order */
1a7c618a 192 u8 _BQC_use_index:1; /* _BQC returns an index value */
d32f6947
ZR		 193};
194
1da177e4 195struct acpi_video_device_brightness {
4be44fcd
LB		 196 int curr;
197 int count;
198 int *levels;
d32f6947 199 struct acpi_video_brightness_flags flags;
1da177e4
LT		 200};
201
202struct acpi_video_device {
4be44fcd
LB		 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;
1da177e4 209 struct acpi_video_device_brightness *brightness;
2f3d000a 210 struct backlight_device *backlight;
4a703a8f 211 struct thermal_cooling_device *cooling_dev;
1da177e4
LT		 212};
213
b7171ae7 214static const char device_decode[][30] = {
1da177e4
LT		 215 "motherboard VGA device",
216 "PCI VGA device",
217 "AGP VGA device",
218 "UNKNOWN",
219};
220
4be44fcd
LB		 221static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
222static void acpi_video_device_rebind(struct acpi_video_bus *video);
223static void acpi_video_device_bind(struct acpi_video_bus *video,
224 struct acpi_video_device *device);
1da177e4 225static int acpi_video_device_enumerate(struct acpi_video_bus *video);
2f3d000a
YL		 226static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
227 int level);
228static int acpi_video_device_lcd_get_level_current(
229 struct acpi_video_device *device,
a89803df 230 unsigned long long *level, bool raw);
4be44fcd
LB		 231static int acpi_video_get_next_level(struct acpi_video_device *device,
232 u32 level_current, u32 event);
c8890f90 233static int acpi_video_switch_brightness(struct acpi_video_device *device,
4be44fcd 234 int event);
1da177e4 235
0e9f81d3
AL		 236static 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
fbc9fe1b
AL		 244static bool acpi_video_verify_backlight_support(void)
245{
0e9f81d3 246 if (acpi_osi_is_win8() && acpi_video_use_native_backlight() &&
fbc9fe1b
AL		 247 backlight_device_registered(BACKLIGHT_RAW))
248 return false;
249 return acpi_video_backlight_support();
250}
251
21fcb34e 252/* backlight device sysfs support */
2f3d000a
YL		 253static int acpi_video_get_brightness(struct backlight_device *bd)
254{
27663c58 255 unsigned long long cur_level;
38531e6f 256 int i;
7c364e79 257 struct acpi_video_device *vd = bl_get_data(bd);
c8890f90 258
a89803df 259 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
c8890f90 260 return -EINVAL;
38531e6f
MG		 261 for (i = 2; i < vd->brightness->count; i++) {
262 if (vd->brightness->levels[i] == cur_level)
21fcb34e
FC		 263 /*
264 * The first two entries are special - see page 575
265 * of the ACPI spec 3.0
266 */
915ea7e4 267 return i - 2;
38531e6f
MG		 268 }
269 return 0;
2f3d000a
YL		 270}
271
272static int acpi_video_set_brightness(struct backlight_device *bd)
273{
24450c7a 274 int request_level = bd->props.brightness + 2;
7c364e79 275 struct acpi_video_device *vd = bl_get_data(bd);
24450c7a
ZR		 276
277 return acpi_video_device_lcd_set_level(vd,
278 vd->brightness->levels[request_level]);
2f3d000a
YL		 279}
280
acc2472e 281static const struct backlight_ops acpi_backlight_ops = {
599a52d1
RP		 282 .get_brightness = acpi_video_get_brightness,
283 .update_status = acpi_video_set_brightness,
284};
285
702ed512 286/* thermal cooling device callbacks */
4a703a8f 287static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
6503e5df 288 long *state)
702ed512 289{
4a703a8f 290 struct acpi_device *device = cooling_dev->devdata;
702ed512
ZR		 291 struct acpi_video_device *video = acpi_driver_data(device);
292
6503e5df
MG		 293 *state = video->brightness->count - 3;
294 return 0;
702ed512
ZR		 295}
296
4a703a8f 297static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
6503e5df 298 long *state)
702ed512 299{
4a703a8f 300 struct acpi_device *device = cooling_dev->devdata;
702ed512 301 struct acpi_video_device *video = acpi_driver_data(device);
27663c58 302 unsigned long long level;
6503e5df 303 int offset;
702ed512 304
a89803df 305 if (acpi_video_device_lcd_get_level_current(video, &level, false))
c8890f90 306 return -EINVAL;
6503e5df
MG		 307 for (offset = 2; offset < video->brightness->count; offset++)
308 if (level == video->brightness->levels[offset]) {
309 *state = video->brightness->count - offset - 1;
310 return 0;
311 }
702ed512
ZR		 312
313 return -EINVAL;
314}
315
316static int
4a703a8f 317video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
702ed512 318{
4a703a8f 319 struct acpi_device *device = cooling_dev->devdata;
702ed512
ZR		 320 struct acpi_video_device *video = acpi_driver_data(device);
321 int level;
322
915ea7e4 323 if (state >= video->brightness->count - 2)
702ed512
ZR		 324 return -EINVAL;
325
326 state = video->brightness->count - state;
915ea7e4 327 level = video->brightness->levels[state - 1];
702ed512
ZR		 328 return acpi_video_device_lcd_set_level(video, level);
329}
330
9c8b04be 331static const struct thermal_cooling_device_ops video_cooling_ops = {
702ed512
ZR		 332 .get_max_state = video_get_max_state,
333 .get_cur_state = video_get_cur_state,
334 .set_cur_state = video_set_cur_state,
335};
336
21fcb34e
FC		 337/*
338 * --------------------------------------------------------------------------
339 * Video Management
340 * --------------------------------------------------------------------------
341 */
1da177e4 342
1da177e4 343static int
4be44fcd
LB		 344acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
345 union acpi_object **levels)
1da177e4 346{
4be44fcd
LB		 347 int status;
348 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
349 union acpi_object *obj;
1da177e4 350
1da177e4
LT		 351
352 *levels = NULL;
353
90130268 354 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
1da177e4 355 if (!ACPI_SUCCESS(status))
d550d98d 356 return status;
4be44fcd 357 obj = (union acpi_object *)buffer.pointer;
6665bda7 358 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
6468463a 359 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
1da177e4
LT		 360 status = -EFAULT;
361 goto err;
362 }
363
364 *levels = obj;
365
d550d98d 366 return 0;
1da177e4 367
915ea7e4 368err:
6044ec88 369 kfree(buffer.pointer);
1da177e4 370
d550d98d 371 return status;
1da177e4
LT		 372}
373
374static int
4be44fcd 375acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
1da177e4 376{
24450c7a 377 int status;
9e6dada9 378 int state;
1da177e4 379
0db98202
JL		 380 status = acpi_execute_simple_method(device->dev->handle,
381 "_BCM", level);
24450c7a
ZR		 382 if (ACPI_FAILURE(status)) {
383 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
384 return -EIO;
385 }
386
4500ca8e 387 device->brightness->curr = level;
9e6dada9 388 for (state = 2; state < device->brightness->count; state++)
24450c7a 389 if (level == device->brightness->levels[state]) {
1a7c618a
ZR		 390 if (device->backlight)
391 device->backlight->props.brightness = state - 2;
24450c7a
ZR		 392 return 0;
393 }
9e6dada9 394
24450c7a
ZR		 395 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
396 return -EINVAL;
1da177e4
LT		 397}
398
45cb50e6
ZR		 399/*
400 * For some buggy _BQC methods, we need to add a constant value to
401 * the _BQC return value to get the actual current brightness level
402 */
403
404static int bqc_offset_aml_bug_workaround;
405static int __init video_set_bqc_offset(const struct dmi_system_id *d)
406{
407 bqc_offset_aml_bug_workaround = 9;
408 return 0;
409}
410
0e9f81d3
AL		 411static int __init video_set_use_native_backlight(const struct dmi_system_id *d)
412{
413 use_native_backlight_dmi = true;
414 return 0;
415}
416
45cb50e6
ZR		 417static struct dmi_system_id video_dmi_table[] __initdata = {
418 /*
419 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
420 */
421 {
422 .callback = video_set_bqc_offset,
423 .ident = "Acer Aspire 5720",
424 .matches = {
425 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
426 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
427 },
428 },
5afc4abe
LB		 429 {
430 .callback = video_set_bqc_offset,
431 .ident = "Acer Aspire 5710Z",
432 .matches = {
433 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
434 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
435 },
436 },
34ac272b
ZR		 437 {
438 .callback = video_set_bqc_offset,
439 .ident = "eMachines E510",
440 .matches = {
441 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
442 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
443 },
444 },
93bcece2
ZR		 445 {
446 .callback = video_set_bqc_offset,
447 .ident = "Acer Aspire 5315",
448 .matches = {
449 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
450 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
451 },
452 },
152a4e63
ZR		 453 {
454 .callback = video_set_bqc_offset,
455 .ident = "Acer Aspire 7720",
456 .matches = {
457 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
458 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
459 },
460 },
0e9f81d3
AL		 461 {
462 .callback = video_set_use_native_backlight,
43d94902 463 .ident = "ThinkPad T430 and T430s",
0e9f81d3
AL		 464 .matches = {
465 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
43d94902 466 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T430"),
0e9f81d3
AL		 467 },
468 },
469 {
470 .callback = video_set_use_native_backlight,
471 .ident = "ThinkPad X230",
472 .matches = {
473 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
474 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X230"),
475 },
476 },
1e815db6
HG		 477 {
478 .callback = video_set_use_native_backlight,
479 .ident = "ThinkPad W530",
480 .matches = {
481 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
482 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad W530"),
483 },
484 },
43d94902
HG		 485 {
486 .callback = video_set_use_native_backlight,
0e9f81d3
AL		 487 .ident = "ThinkPad X1 Carbon",
488 .matches = {
489 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
490 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X1 Carbon"),
491 },
492 },
493 {
494 .callback = video_set_use_native_backlight,
495 .ident = "Lenovo Yoga 13",
496 .matches = {
497 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
498 DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo IdeaPad Yoga 13"),
499 },
500 },
0dc6b96a
HG		 501 {
502 .callback = video_set_use_native_backlight,
503 .ident = "Lenovo Yoga 2 11",
504 .matches = {
505 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
506 DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo Yoga 2 11"),
507 },
508 },
997dd7fe
SCP		 509 {
510 .callback = video_set_use_native_backlight,
511 .ident = "Thinkpad Helix",
512 .matches = {
513 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
514 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad Helix"),
515 },
516 },
0e9f81d3
AL		 517 {
518 .callback = video_set_use_native_backlight,
519 .ident = "Dell Inspiron 7520",
520 .matches = {
521 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
5ff365fb 522 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7520"),
0e9f81d3
AL		 523 },
524 },
525 {
526 .callback = video_set_use_native_backlight,
527 .ident = "Acer Aspire 5733Z",
528 .matches = {
529 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
530 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5733Z"),
531 },
532 },
43d94902
HG		 533 {
534 .callback = video_set_use_native_backlight,
535 .ident = "Acer Aspire 5742G",
536 .matches = {
537 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
538 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5742G"),
539 },
540 },
0dc6b96a
HG		 541 {
542 .callback = video_set_use_native_backlight,
543 .ident = "Acer Aspire V5-171",
544 .matches = {
545 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
546 DMI_MATCH(DMI_PRODUCT_NAME, "V5-171"),
547 },
548 },
0e9f81d3
AL		 549 {
550 .callback = video_set_use_native_backlight,
551 .ident = "Acer Aspire V5-431",
552 .matches = {
553 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
554 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-431"),
555 },
556 },
0dc6b96a
HG		 557 {
558 .callback = video_set_use_native_backlight,
559 .ident = "Acer Aspire V5-471G",
560 .matches = {
561 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
562 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-471G"),
563 },
564 },
0e9f81d3
AL		 565 {
566 .callback = video_set_use_native_backlight,
567 .ident = "HP ProBook 4340s",
568 .matches = {
569 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
570 DMI_MATCH(DMI_PRODUCT_VERSION, "HP ProBook 4340s"),
571 },
572 },
573 {
574 .callback = video_set_use_native_backlight,
575 .ident = "HP ProBook 2013 models",
576 .matches = {
577 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
578 DMI_MATCH(DMI_PRODUCT_NAME, "HP ProBook "),
579 DMI_MATCH(DMI_PRODUCT_NAME, " G1"),
580 },
581 },
582 {
583 .callback = video_set_use_native_backlight,
584 .ident = "HP EliteBook 2013 models",
585 .matches = {
586 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
587 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook "),
588 DMI_MATCH(DMI_PRODUCT_NAME, " G1"),
589 },
590 },
591 {
592 .callback = video_set_use_native_backlight,
593 .ident = "HP ZBook 14",
594 .matches = {
595 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
596 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 14"),
597 },
598 },
599 {
600 .callback = video_set_use_native_backlight,
601 .ident = "HP ZBook 15",
602 .matches = {
603 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
604 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 15"),
605 },
606 },
607 {
608 .callback = video_set_use_native_backlight,
609 .ident = "HP ZBook 17",
610 .matches = {
611 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
612 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 17"),
613 },
614 },
615 {
616 .callback = video_set_use_native_backlight,
0dc6b96a
HG		 617 .ident = "HP EliteBook 8470p",
618 .matches = {
619 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
620 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8470p"),
621 },
622 },
623 {
624 .callback = video_set_use_native_backlight,
0e9f81d3
AL		 625 .ident = "HP EliteBook 8780w",
626 .matches = {
627 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
628 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8780w"),
629 },
630 },
45cb50e6
ZR		 631 {}
632};
633
994fa63c
DB		 634static unsigned long long
635acpi_video_bqc_value_to_level(struct acpi_video_device *device,
636 unsigned long long bqc_value)
637{
638 unsigned long long level;
639
640 if (device->brightness->flags._BQC_use_index) {
641 /*
642 * _BQC returns an index that doesn't account for
643 * the first 2 items with special meaning, so we need
644 * to compensate for that by offsetting ourselves
645 */
646 if (device->brightness->flags._BCL_reversed)
647 bqc_value = device->brightness->count - 3 - bqc_value;
648
649 level = device->brightness->levels[bqc_value + 2];
650 } else {
651 level = bqc_value;
652 }
653
654 level += bqc_offset_aml_bug_workaround;
655
656 return level;
657}
658
1da177e4 659static int
4be44fcd 660acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
a89803df 661 unsigned long long *level, bool raw)
1da177e4 662{
c8890f90 663 acpi_status status = AE_OK;
4e231fa4 664 int i;
c8890f90 665
c60d638e
ZR		 666 if (device->cap._BQC || device->cap._BCQ) {
667 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
668
669 status = acpi_evaluate_integer(device->dev->handle, buf,
c8890f90
ZR		 670 NULL, level);
671 if (ACPI_SUCCESS(status)) {
a89803df
DB		 672 if (raw) {
673 /*
674 * Caller has indicated he wants the raw
675 * value returned by _BQC, so don't furtherly
676 * mess with the value.
677 */
678 return 0;
679 }
680
994fa63c 681 *level = acpi_video_bqc_value_to_level(device, *level);
1a7c618a 682
4e231fa4
VS		 683 for (i = 2; i < device->brightness->count; i++)
684 if (device->brightness->levels[i] == *level) {
685 device->brightness->curr = *level;
686 return 0;
915ea7e4 687 }
a89803df
DB		 688 /*
689 * BQC returned an invalid level.
690 * Stop using it.
691 */
692 ACPI_WARNING((AE_INFO,
693 "%s returned an invalid level",
694 buf));
695 device->cap._BQC = device->cap._BCQ = 0;
c8890f90 696 } else {
21fcb34e
FC		 697 /*
698 * Fixme:
c8890f90
ZR		 699 * should we return an error or ignore this failure?
700 * dev->brightness->curr is a cached value which stores
701 * the correct current backlight level in most cases.
702 * ACPI video backlight still works w/ buggy _BQC.
703 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
704 */
c60d638e
ZR		 705 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
706 device->cap._BQC = device->cap._BCQ = 0;
c8890f90
ZR		 707 }
708 }
709
4500ca8e 710 *level = device->brightness->curr;
c8890f90 711 return 0;
1da177e4
LT		 712}
713
714static int
4be44fcd
LB		 715acpi_video_device_EDID(struct acpi_video_device *device,
716 union acpi_object **edid, ssize_t length)
1da177e4 717{
4be44fcd
LB		 718 int status;
719 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
720 union acpi_object *obj;
721 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
722 struct acpi_object_list args = { 1, &arg0 };
1da177e4 723
1da177e4
LT		 724
725 *edid = NULL;
726
727 if (!device)
d550d98d 728 return -ENODEV;
1da177e4
LT		 729 if (length == 128)
730 arg0.integer.value = 1;
731 else if (length == 256)
732 arg0.integer.value = 2;
733 else
d550d98d 734 return -EINVAL;
1da177e4 735
90130268 736 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
1da177e4 737 if (ACPI_FAILURE(status))
d550d98d 738 return -ENODEV;
1da177e4 739
50dd0969 740 obj = buffer.pointer;
1da177e4
LT		 741
742 if (obj && obj->type == ACPI_TYPE_BUFFER)
743 *edid = obj;
744 else {
6468463a 745 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
1da177e4
LT		 746 status = -EFAULT;
747 kfree(obj);
748 }
749
d550d98d 750 return status;
1da177e4
LT		 751}
752
1da177e4
LT		 753/* bus */
754
1da177e4
LT		 755/*
756 * Arg:
21fcb34e
FC		 757 * video : video bus device pointer
758 * bios_flag :
1da177e4
LT		 759 * 0. The system BIOS should NOT automatically switch(toggle)
760 * the active display output.
761 * 1. The system BIOS should automatically switch (toggle) the
98fb8fe1 762 * active display output. No switch event.
1da177e4
LT		 763 * 2. The _DGS value should be locked.
764 * 3. The system BIOS should not automatically switch (toggle) the
765 * active display output, but instead generate the display switch
766 * event notify code.
767 * lcd_flag :
768 * 0. The system BIOS should automatically control the brightness level
98fb8fe1 769 * of the LCD when the power changes from AC to DC
21fcb34e 770 * 1. The system BIOS should NOT automatically control the brightness
98fb8fe1 771 * level of the LCD when the power changes from AC to DC.
21fcb34e 772 * Return Value:
ea9f8856 773 * -EINVAL wrong arg.
1da177e4
LT		 774 */
775
776static int
4be44fcd 777acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
1da177e4 778{
ea9f8856 779 acpi_status status;
1da177e4 780
b0373843
ZR		 781 if (!video->cap._DOS)
782 return 0;
1da177e4 783
ea9f8856
IM		 784 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
785 return -EINVAL;
0db98202
JL		 786 video->dos_setting = (lcd_flag << 2) | bios_flag;
787 status = acpi_execute_simple_method(video->device->handle, "_DOS",
788 (lcd_flag << 2) | bios_flag);
ea9f8856
IM		 789 if (ACPI_FAILURE(status))
790 return -EIO;
1da177e4 791
ea9f8856 792 return 0;
1da177e4
LT		 793}
794
935e5f29
ZR		 795/*
796 * Simple comparison function used to sort backlight levels.
797 */
798
799static int
800acpi_video_cmp_level(const void *a, const void *b)
801{
802 return *(int *)a - *(int *)b;
803}
804
a50188da
AL		 805/*
806 * Decides if _BQC/_BCQ for this system is usable
807 *
808 * We do this by changing the level first and then read out the current
809 * brightness level, if the value does not match, find out if it is using
810 * index. If not, clear the _BQC/_BCQ capability.
811 */
812static int acpi_video_bqc_quirk(struct acpi_video_device *device,
813 int max_level, int current_level)
814{
815 struct acpi_video_device_brightness *br = device->brightness;
816 int result;
817 unsigned long long level;
818 int test_level;
819
820 /* don't mess with existing known broken systems */
821 if (bqc_offset_aml_bug_workaround)
822 return 0;
823
824 /*
825 * Some systems always report current brightness level as maximum
826 * through _BQC, we need to test another value for them.
827 */
b3b301c5 828 test_level = current_level == max_level ? br->levels[3] : max_level;
a50188da
AL		 829
830 result = acpi_video_device_lcd_set_level(device, test_level);
831 if (result)
832 return result;
833
834 result = acpi_video_device_lcd_get_level_current(device, &level, true);
835 if (result)
836 return result;
837
838 if (level != test_level) {
839 /* buggy _BQC found, need to find out if it uses index */
840 if (level < br->count) {
841 if (br->flags._BCL_reversed)
842 level = br->count - 3 - level;
843 if (br->levels[level + 2] == test_level)
844 br->flags._BQC_use_index = 1;
845 }
846
847 if (!br->flags._BQC_use_index)
848 device->cap._BQC = device->cap._BCQ = 0;
849 }
850
851 return 0;
852}
853
854
1da177e4 855/*
21fcb34e
FC		 856 * Arg:
857 * device : video output device (LCD, CRT, ..)
1da177e4
LT		 858 *
859 * Return Value:
469778c1
JJ		 860 * Maximum brightness level
861 *
862 * Allocate and initialize device->brightness.
863 */
864
865static int
866acpi_video_init_brightness(struct acpi_video_device *device)
867{
868 union acpi_object *obj = NULL;
d32f6947 869 int i, max_level = 0, count = 0, level_ac_battery = 0;
1a7c618a 870 unsigned long long level, level_old;
469778c1
JJ		 871 union acpi_object *o;
872 struct acpi_video_device_brightness *br = NULL;
1a7c618a 873 int result = -EINVAL;
bd8ba205 874 u32 value;
469778c1
JJ		 875
876 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
877 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
878 "LCD brightness level\n"));
879 goto out;
880 }
881
882 if (obj->package.count < 2)
883 goto out;
884
885 br = kzalloc(sizeof(*br), GFP_KERNEL);
886 if (!br) {
887 printk(KERN_ERR "can't allocate memory\n");
1a7c618a 888 result = -ENOMEM;
469778c1
JJ		 889 goto out;
890 }
891
d32f6947 892 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
469778c1 893 GFP_KERNEL);
1a7c618a
ZR		 894 if (!br->levels) {
895 result = -ENOMEM;
469778c1 896 goto out_free;
1a7c618a 897 }
469778c1
JJ		 898
899 for (i = 0; i < obj->package.count; i++) {
900 o = (union acpi_object *)&obj->package.elements[i];
901 if (o->type != ACPI_TYPE_INTEGER) {
902 printk(KERN_ERR PREFIX "Invalid data\n");
903 continue;
904 }
bd8ba205
HG		 905 value = (u32) o->integer.value;
906 /* Skip duplicate entries */
907 if (count > 2 && br->levels[count - 1] == value)
908 continue;
909
910 br->levels[count] = value;
469778c1
JJ		 911
912 if (br->levels[count] > max_level)
913 max_level = br->levels[count];
914 count++;
915 }
916
d32f6947
ZR		 917 /*
918 * some buggy BIOS don't export the levels
919 * when machine is on AC/Battery in _BCL package.
920 * In this case, the first two elements in _BCL packages
921 * are also supported brightness levels that OS should take care of.
922 */
90af2cf6
ZR		 923 for (i = 2; i < count; i++) {
924 if (br->levels[i] == br->levels[0])
d32f6947 925 level_ac_battery++;
90af2cf6
ZR		 926 if (br->levels[i] == br->levels[1])
927 level_ac_battery++;
928 }
d32f6947
ZR		 929
930 if (level_ac_battery < 2) {
931 level_ac_battery = 2 - level_ac_battery;
932 br->flags._BCL_no_ac_battery_levels = 1;
933 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
934 br->levels[i] = br->levels[i - level_ac_battery];
935 count += level_ac_battery;
936 } else if (level_ac_battery > 2)
bf6787eb 937 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
d32f6947 938
d80fb99f
ZR		 939 /* Check if the _BCL package is in a reversed order */
940 if (max_level == br->levels[2]) {
941 br->flags._BCL_reversed = 1;
942 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
943 acpi_video_cmp_level, NULL);
944 } else if (max_level != br->levels[count - 1])
945 ACPI_ERROR((AE_INFO,
bf6787eb 946 "Found unordered _BCL package"));
469778c1
JJ		 947
948 br->count = count;
949 device->brightness = br;
1a7c618a 950
1a7c618a 951 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
90c53ca4 952 br->curr = level = max_level;
e047cca6
ZR		 953
954 if (!device->cap._BQC)
955 goto set_level;
956
a89803df
DB		 957 result = acpi_video_device_lcd_get_level_current(device,
958 &level_old, true);
1a7c618a
ZR		 959 if (result)
960 goto out_free_levels;
961
a50188da 962 result = acpi_video_bqc_quirk(device, max_level, level_old);
1a7c618a
ZR		 963 if (result)
964 goto out_free_levels;
a50188da
AL		 965 /*
966 * cap._BQC may get cleared due to _BQC is found to be broken
967 * in acpi_video_bqc_quirk, so check again here.
968 */
969 if (!device->cap._BQC)
970 goto set_level;
e047cca6 971
545ef368
AL		 972 level = acpi_video_bqc_value_to_level(device, level_old);
973 /*
974 * On some buggy laptops, _BQC returns an uninitialized
975 * value when invoked for the first time, i.e.
976 * level_old is invalid (no matter whether it's a level
977 * or an index). Set the backlight to max_level in this case.
978 */
979 for (i = 2; i < br->count; i++)
980 if (level == br->levels[i])
981 break;
982 if (i == br->count || !level)
983 level = max_level;
e047cca6 984
e047cca6 985set_level:
90c53ca4 986 result = acpi_video_device_lcd_set_level(device, level);
e047cca6
ZR		 987 if (result)
988 goto out_free_levels;
1a7c618a 989
d32f6947
ZR		 990 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
991 "found %d brightness levels\n", count - 2));
469778c1 992 kfree(obj);
1a7c618a 993 return result;
469778c1
JJ		 994
995out_free_levels:
996 kfree(br->levels);
997out_free:
998 kfree(br);
999out:
1000 device->brightness = NULL;
1001 kfree(obj);
1a7c618a 1002 return result;
469778c1
JJ		 1003}
1004
1005/*
1006 * Arg:
1007 * device : video output device (LCD, CRT, ..)
1008 *
1009 * Return Value:
21fcb34e 1010 * None
1da177e4 1011 *
98fb8fe1 1012 * Find out all required AML methods defined under the output
1da177e4
LT		 1013 * device.
1014 */
1015
4be44fcd 1016static void acpi_video_device_find_cap(struct acpi_video_device *device)
1da177e4 1017{
952c63e9 1018 if (acpi_has_method(device->dev->handle, "_ADR"))
1da177e4 1019 device->cap._ADR = 1;
952c63e9 1020 if (acpi_has_method(device->dev->handle, "_BCL"))
4be44fcd 1021 device->cap._BCL = 1;
952c63e9 1022 if (acpi_has_method(device->dev->handle, "_BCM"))
4be44fcd 1023 device->cap._BCM = 1;
952c63e9 1024 if (acpi_has_method(device->dev->handle, "_BQC")) {
2f3d000a 1025 device->cap._BQC = 1;
952c63e9 1026 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
c60d638e
ZR		 1027 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
1028 device->cap._BCQ = 1;
1029 }
1030
952c63e9 1031 if (acpi_has_method(device->dev->handle, "_DDC"))
4be44fcd 1032 device->cap._DDC = 1;
1da177e4
LT		 1033}
1034
1035/*
21fcb34e
FC		 1036 * Arg:
1037 * device : video output device (VGA)
1da177e4
LT		 1038 *
1039 * Return Value:
21fcb34e 1040 * None
1da177e4 1041 *
98fb8fe1 1042 * Find out all required AML methods defined under the video bus device.
1da177e4
LT		 1043 */
1044
4be44fcd 1045static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1da177e4 1046{
952c63e9 1047 if (acpi_has_method(video->device->handle, "_DOS"))
1da177e4 1048 video->cap._DOS = 1;
952c63e9 1049 if (acpi_has_method(video->device->handle, "_DOD"))
1da177e4 1050 video->cap._DOD = 1;
952c63e9 1051 if (acpi_has_method(video->device->handle, "_ROM"))
1da177e4 1052 video->cap._ROM = 1;
952c63e9 1053 if (acpi_has_method(video->device->handle, "_GPD"))
1da177e4 1054 video->cap._GPD = 1;
952c63e9 1055 if (acpi_has_method(video->device->handle, "_SPD"))
1da177e4 1056 video->cap._SPD = 1;
952c63e9 1057 if (acpi_has_method(video->device->handle, "_VPO"))
1da177e4 1058 video->cap._VPO = 1;
1da177e4
LT		 1059}
1060
1061/*
1062 * Check whether the video bus device has required AML method to
1063 * support the desired features
1064 */
1065
4be44fcd 1066static int acpi_video_bus_check(struct acpi_video_bus *video)
1da177e4 1067{
4be44fcd 1068 acpi_status status = -ENOENT;
1e4cffe7 1069 struct pci_dev *dev;
1da177e4
LT		 1070
1071 if (!video)
d550d98d 1072 return -EINVAL;
1da177e4 1073
1e4cffe7 1074 dev = acpi_get_pci_dev(video->device->handle);
22c13f9d
TR		 1075 if (!dev)
1076 return -ENODEV;
1e4cffe7 1077 pci_dev_put(dev);
22c13f9d 1078
21fcb34e
FC		 1079 /*
1080 * Since there is no HID, CID and so on for VGA driver, we have
1da177e4
LT		 1081 * to check well known required nodes.
1082 */
1083
98fb8fe1 1084 /* Does this device support video switching? */
3a1151e3
SB		 1085 if (video->cap._DOS || video->cap._DOD) {
1086 if (!video->cap._DOS) {
1087 printk(KERN_WARNING FW_BUG
1088 "ACPI(%s) defines _DOD but not _DOS\n",
1089 acpi_device_bid(video->device));
1090 }
1da177e4
LT		 1091 video->flags.multihead = 1;
1092 status = 0;
1093 }
1094
98fb8fe1 1095 /* Does this device support retrieving a video ROM? */
4be44fcd 1096 if (video->cap._ROM) {
1da177e4
LT		 1097 video->flags.rom = 1;
1098 status = 0;
1099 }
1100
98fb8fe1 1101 /* Does this device support configuring which video device to POST? */
4be44fcd 1102 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1da177e4
LT		 1103 video->flags.post = 1;
1104 status = 0;
1105 }
1106
d550d98d 1107 return status;
1da177e4
LT		 1108}
1109
21fcb34e
FC		 1110/*
1111 * --------------------------------------------------------------------------
1112 * Driver Interface
1113 * --------------------------------------------------------------------------
1114 */
1da177e4
LT		 1115
1116/* device interface */
915ea7e4 1117static struct acpi_video_device_attrib *
82cae999
RZ		 1118acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1119{
78eed028
DT		 1120 struct acpi_video_enumerated_device *ids;
1121 int i;
1122
1123 for (i = 0; i < video->attached_count; i++) {
1124 ids = &video->attached_array[i];
1125 if ((ids->value.int_val & 0xffff) == device_id)
1126 return &ids->value.attrib;
1127 }
82cae999 1128
82cae999
RZ		 1129 return NULL;
1130}
1da177e4 1131
e92a7162
MG		 1132static int
1133acpi_video_get_device_type(struct acpi_video_bus *video,
1134 unsigned long device_id)
1135{
1136 struct acpi_video_enumerated_device *ids;
1137 int i;
1138
1139 for (i = 0; i < video->attached_count; i++) {
1140 ids = &video->attached_array[i];
1141 if ((ids->value.int_val & 0xffff) == device_id)
1142 return ids->value.int_val;
1143 }
1144
1145 return 0;
1146}
1147
1da177e4 1148static int
4be44fcd
LB		 1149acpi_video_bus_get_one_device(struct acpi_device *device,
1150 struct acpi_video_bus *video)
1da177e4 1151{
27663c58 1152 unsigned long long device_id;
e92a7162 1153 int status, device_type;
4be44fcd 1154 struct acpi_video_device *data;
915ea7e4 1155 struct acpi_video_device_attrib *attribute;
1da177e4 1156
4be44fcd
LB		 1157 status =
1158 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
91e13aa3
AL		 1159 /* Some device omits _ADR, we skip them instead of fail */
1160 if (ACPI_FAILURE(status))
1161 return 0;
1da177e4 1162
91e13aa3
AL		 1163 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1164 if (!data)
1165 return -ENOMEM;
82cae999 1166
91e13aa3
AL		 1167 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1168 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1169 device->driver_data = data;
1170
1171 data->device_id = device_id;
1172 data->video = video;
1173 data->dev = device;
1174
1175 attribute = acpi_video_get_device_attr(video, device_id);
1176
915ea7e4 1177 if (attribute && attribute->device_id_scheme) {
91e13aa3
AL		 1178 switch (attribute->display_type) {
1179 case ACPI_VIDEO_DISPLAY_CRT:
1180 data->flags.crt = 1;
1181 break;
1182 case ACPI_VIDEO_DISPLAY_TV:
1183 data->flags.tvout = 1;
1184 break;
1185 case ACPI_VIDEO_DISPLAY_DVI:
1186 data->flags.dvi = 1;
1187 break;
1188 case ACPI_VIDEO_DISPLAY_LCD:
1189 data->flags.lcd = 1;
1190 break;
1191 default:
1192 data->flags.unknown = 1;
1193 break;
1194 }
915ea7e4 1195 if (attribute->bios_can_detect)
91e13aa3
AL		 1196 data->flags.bios = 1;
1197 } else {
1198 /* Check for legacy IDs */
1199 device_type = acpi_video_get_device_type(video, device_id);
1200 /* Ignore bits 16 and 18-20 */
1201 switch (device_type & 0xffe2ffff) {
915ea7e4
FC		 1202 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1203 data->flags.crt = 1;
1204 break;
1205 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1206 data->flags.lcd = 1;
1207 break;
1208 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1209 data->flags.tvout = 1;
1210 break;
1211 default:
1212 data->flags.unknown = 1;
e92a7162 1213 }
91e13aa3 1214 }
4be44fcd 1215
91e13aa3
AL		 1216 acpi_video_device_bind(video, data);
1217 acpi_video_device_find_cap(data);
1da177e4 1218
91e13aa3
AL		 1219 mutex_lock(&video->device_list_lock);
1220 list_add_tail(&data->entry, &video->video_device_list);
1221 mutex_unlock(&video->device_list_lock);
1da177e4 1222
91e13aa3 1223 return status;
1da177e4
LT		 1224}
1225
1226/*
1227 * Arg:
21fcb34e 1228 * video : video bus device
1da177e4
LT		 1229 *
1230 * Return:
21fcb34e
FC		 1231 * none
1232 *
1233 * Enumerate the video device list of the video bus,
1da177e4
LT		 1234 * bind the ids with the corresponding video devices
1235 * under the video bus.
4be44fcd 1236 */
1da177e4 1237
4be44fcd 1238static void acpi_video_device_rebind(struct acpi_video_bus *video)
1da177e4 1239{
ff102ea9
DT		 1240 struct acpi_video_device *dev;
1241
bbac81f5 1242 mutex_lock(&video->device_list_lock);
ff102ea9
DT		 1243
1244 list_for_each_entry(dev, &video->video_device_list, entry)
4be44fcd 1245 acpi_video_device_bind(video, dev);
ff102ea9 1246
bbac81f5 1247 mutex_unlock(&video->device_list_lock);
1da177e4
LT		 1248}
1249
1250/*
1251 * Arg:
21fcb34e
FC		 1252 * video : video bus device
1253 * device : video output device under the video
1254 * bus
1da177e4
LT		 1255 *
1256 * Return:
21fcb34e
FC		 1257 * none
1258 *
1da177e4
LT		 1259 * Bind the ids with the corresponding video devices
1260 * under the video bus.
4be44fcd 1261 */
1da177e4
LT		 1262
1263static void
4be44fcd
LB		 1264acpi_video_device_bind(struct acpi_video_bus *video,
1265 struct acpi_video_device *device)
1da177e4 1266{
78eed028 1267 struct acpi_video_enumerated_device *ids;
4be44fcd 1268 int i;
1da177e4 1269
78eed028
DT		 1270 for (i = 0; i < video->attached_count; i++) {
1271 ids = &video->attached_array[i];
1272 if (device->device_id == (ids->value.int_val & 0xffff)) {
1273 ids->bind_info = device;
1da177e4
LT		 1274 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1275 }
1276 }
1da177e4
LT		 1277}
1278
1279/*
1280 * Arg:
21fcb34e 1281 * video : video bus device
1da177e4
LT		 1282 *
1283 * Return:
21fcb34e
FC		 1284 * < 0 : error
1285 *
1da177e4
LT		 1286 * Call _DOD to enumerate all devices attached to display adapter
1287 *
4be44fcd 1288 */
1da177e4
LT		 1289
1290static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1291{
4be44fcd
LB		 1292 int status;
1293 int count;
1294 int i;
78eed028 1295 struct acpi_video_enumerated_device *active_list;
4be44fcd
LB		 1296 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1297 union acpi_object *dod = NULL;
1298 union acpi_object *obj;
1da177e4 1299
90130268 1300 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1da177e4 1301 if (!ACPI_SUCCESS(status)) {
a6fc6720 1302 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
d550d98d 1303 return status;
1da177e4
LT		 1304 }
1305
50dd0969 1306 dod = buffer.pointer;
1da177e4 1307 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
a6fc6720 1308 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1da177e4
LT		 1309 status = -EFAULT;
1310 goto out;
1311 }
1312
1313 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
4be44fcd 1314 dod->package.count));
1da177e4 1315
78eed028
DT		 1316 active_list = kcalloc(1 + dod->package.count,
1317 sizeof(struct acpi_video_enumerated_device),
1318 GFP_KERNEL);
1319 if (!active_list) {
1da177e4
LT		 1320 status = -ENOMEM;
1321 goto out;
1322 }
1323
1324 count = 0;
1325 for (i = 0; i < dod->package.count; i++) {
50dd0969 1326 obj = &dod->package.elements[i];
1da177e4
LT		 1327
1328 if (obj->type != ACPI_TYPE_INTEGER) {
78eed028
DT		 1329 printk(KERN_ERR PREFIX
1330 "Invalid _DOD data in element %d\n", i);
1331 continue;
1da177e4 1332 }
78eed028
DT		 1333
1334 active_list[count].value.int_val = obj->integer.value;
1335 active_list[count].bind_info = NULL;
4be44fcd
LB		 1336 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1337 (int)obj->integer.value));
1da177e4
LT		 1338 count++;
1339 }
1da177e4 1340
6044ec88 1341 kfree(video->attached_array);
4be44fcd 1342
78eed028 1343 video->attached_array = active_list;
1da177e4 1344 video->attached_count = count;
78eed028 1345
915ea7e4 1346out:
02438d87 1347 kfree(buffer.pointer);
d550d98d 1348 return status;
1da177e4
LT		 1349}
1350
4be44fcd
LB		 1351static int
1352acpi_video_get_next_level(struct acpi_video_device *device,
1353 u32 level_current, u32 event)
1da177e4 1354{
63f0edfc 1355 int min, max, min_above, max_below, i, l, delta = 255;
f4715189
TT		 1356 max = max_below = 0;
1357 min = min_above = 255;
63f0edfc 1358 /* Find closest level to level_current */
0a3db1ce 1359 for (i = 2; i < device->brightness->count; i++) {
63f0edfc
AS		 1360 l = device->brightness->levels[i];
1361 if (abs(l - level_current) < abs(delta)) {
1362 delta = l - level_current;
1363 if (!delta)
1364 break;
1365 }
1366 }
1367 /* Ajust level_current to closest available level */
1368 level_current += delta;
0a3db1ce 1369 for (i = 2; i < device->brightness->count; i++) {
f4715189
TT		 1370 l = device->brightness->levels[i];
1371 if (l < min)
1372 min = l;
1373 if (l > max)
1374 max = l;
1375 if (l < min_above && l > level_current)
1376 min_above = l;
1377 if (l > max_below && l < level_current)
1378 max_below = l;
1379 }
1380
1381 switch (event) {
1382 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1383 return (level_current < max) ? min_above : min;
1384 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1385 return (level_current < max) ? min_above : max;
1386 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1387 return (level_current > min) ? max_below : min;
1388 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1389 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1390 return 0;
1391 default:
1392 return level_current;
1393 }
1da177e4
LT		 1394}
1395
c8890f90 1396static int
4be44fcd 1397acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1da177e4 1398{
27663c58 1399 unsigned long long level_current, level_next;
c8890f90
ZR		 1400 int result = -EINVAL;
1401
fbc9fe1b
AL		 1402 /* no warning message if acpi_backlight=vendor or a quirk is used */
1403 if (!acpi_video_verify_backlight_support())
28c32e99
ZR		 1404 return 0;
1405
469778c1 1406 if (!device->brightness)
c8890f90
ZR		 1407 goto out;
1408
1409 result = acpi_video_device_lcd_get_level_current(device,
a89803df
DB		 1410 &level_current,
1411 false);
c8890f90
ZR		 1412 if (result)
1413 goto out;
1414
1da177e4 1415 level_next = acpi_video_get_next_level(device, level_current, event);
c8890f90 1416
24450c7a 1417 result = acpi_video_device_lcd_set_level(device, level_next);
c8890f90 1418
36342742
MG		 1419 if (!result)
1420 backlight_force_update(device->backlight,
1421 BACKLIGHT_UPDATE_HOTKEY);
1422
c8890f90
ZR		 1423out:
1424 if (result)
1425 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1426
1427 return result;
1da177e4
LT		 1428}
1429
e92a7162
MG		 1430int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1431 void **edid)
1432{
1433 struct acpi_video_bus *video;
1434 struct acpi_video_device *video_device;
1435 union acpi_object *buffer = NULL;
1436 acpi_status status;
1437 int i, length;
1438
1439 if (!device || !acpi_driver_data(device))
1440 return -EINVAL;
1441
1442 video = acpi_driver_data(device);
1443
1444 for (i = 0; i < video->attached_count; i++) {
1445 video_device = video->attached_array[i].bind_info;
1446 length = 256;
1447
1448 if (!video_device)
1449 continue;
1450
82069552
ZR		 1451 if (!video_device->cap._DDC)
1452 continue;
1453
e92a7162
MG		 1454 if (type) {
1455 switch (type) {
1456 case ACPI_VIDEO_DISPLAY_CRT:
1457 if (!video_device->flags.crt)
1458 continue;
1459 break;
1460 case ACPI_VIDEO_DISPLAY_TV:
1461 if (!video_device->flags.tvout)
1462 continue;
1463 break;
1464 case ACPI_VIDEO_DISPLAY_DVI:
1465 if (!video_device->flags.dvi)
1466 continue;
1467 break;
1468 case ACPI_VIDEO_DISPLAY_LCD:
1469 if (!video_device->flags.lcd)
1470 continue;
1471 break;
1472 }
1473 } else if (video_device->device_id != device_id) {
1474 continue;
1475 }
1476
1477 status = acpi_video_device_EDID(video_device, &buffer, length);
1478
1479 if (ACPI_FAILURE(status) || !buffer ||
1480 buffer->type != ACPI_TYPE_BUFFER) {
1481 length = 128;
1482 status = acpi_video_device_EDID(video_device, &buffer,
1483 length);
1484 if (ACPI_FAILURE(status) || !buffer ||
1485 buffer->type != ACPI_TYPE_BUFFER) {
1486 continue;
1487 }
1488 }
1489
1490 *edid = buffer->buffer.pointer;
1491 return length;
1492 }
1493
1494 return -ENODEV;
1495}
1496EXPORT_SYMBOL(acpi_video_get_edid);
1497
1da177e4 1498static int
4be44fcd
LB		 1499acpi_video_bus_get_devices(struct acpi_video_bus *video,
1500 struct acpi_device *device)
1da177e4 1501{
fba4e087 1502 int status = 0;
ff102ea9 1503 struct acpi_device *dev;
1da177e4 1504
fba4e087
IM		 1505 /*
1506 * There are systems where video module known to work fine regardless
1507 * of broken _DOD and ignoring returned value here doesn't cause
1508 * any issues later.
1509 */
1510 acpi_video_device_enumerate(video);
1da177e4 1511
ff102ea9 1512 list_for_each_entry(dev, &device->children, node) {
1da177e4
LT		 1513
1514 status = acpi_video_bus_get_one_device(dev, video);
ea9f8856 1515 if (status) {
91e13aa3
AL		 1516 dev_err(&dev->dev, "Can't attach device\n");
1517 break;
1da177e4 1518 }
1da177e4 1519 }
d550d98d 1520 return status;
1da177e4
LT		 1521}
1522
1da177e4
LT		 1523/* acpi_video interface */
1524
efaa14c7
AL		 1525/*
1526 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1527 * preform any automatic brightness change on receiving a notification.
1528 */
4be44fcd 1529static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1da177e4 1530{
efaa14c7 1531 return acpi_video_bus_DOS(video, 0,
fbc9fe1b 1532 acpi_osi_is_win8() ? 1 : 0);
1da177e4
LT		 1533}
1534
4be44fcd 1535static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1da177e4 1536{
efaa14c7 1537 return acpi_video_bus_DOS(video, 0,
fbc9fe1b 1538 acpi_osi_is_win8() ? 0 : 1);
1da177e4
LT		 1539}
1540
7015558f 1541static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1da177e4 1542{
7015558f 1543 struct acpi_video_bus *video = acpi_driver_data(device);
e9dab196 1544 struct input_dev *input;
17c452f9 1545 int keycode = 0;
e9dab196 1546
67b662e1 1547 if (!video || !video->input)
d550d98d 1548 return;
1da177e4 1549
e9dab196 1550 input = video->input;
1da177e4
LT		 1551
1552 switch (event) {
98fb8fe1 1553 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1da177e4 1554 * most likely via hotkey. */
8a37c65d 1555 keycode = KEY_SWITCHVIDEOMODE;
1da177e4
LT		 1556 break;
1557
98fb8fe1 1558 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1da177e4
LT		 1559 * connector. */
1560 acpi_video_device_enumerate(video);
1561 acpi_video_device_rebind(video);
e9dab196 1562 keycode = KEY_SWITCHVIDEOMODE;
1da177e4
LT		 1563 break;
1564
4be44fcd 1565 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
e9dab196
LY		 1566 keycode = KEY_SWITCHVIDEOMODE;
1567 break;
4be44fcd 1568 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
e9dab196
LY		 1569 keycode = KEY_VIDEO_NEXT;
1570 break;
4be44fcd 1571 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
e9dab196 1572 keycode = KEY_VIDEO_PREV;
1da177e4
LT		 1573 break;
1574
1575 default:
1576 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
4be44fcd 1577 "Unsupported event [0x%x]\n", event));
1da177e4
LT		 1578 break;
1579 }
1580
8a37c65d
LT		 1581 if (acpi_notifier_call_chain(device, event, 0))
1582 /* Something vetoed the keypress. */
1583 keycode = 0;
17c452f9
MG		 1584
1585 if (keycode) {
1586 input_report_key(input, keycode, 1);
1587 input_sync(input);
1588 input_report_key(input, keycode, 0);
1589 input_sync(input);
1590 }
e9dab196 1591
d550d98d 1592 return;
1da177e4
LT		 1593}
1594
4be44fcd 1595static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1da177e4 1596{
50dd0969 1597 struct acpi_video_device *video_device = data;
4be44fcd 1598 struct acpi_device *device = NULL;
e9dab196
LY		 1599 struct acpi_video_bus *bus;
1600 struct input_dev *input;
17c452f9 1601 int keycode = 0;
1da177e4 1602
1da177e4 1603 if (!video_device)
d550d98d 1604 return;
1da177e4 1605
e6afa0de 1606 device = video_device->dev;
e9dab196
LY		 1607 bus = video_device->video;
1608 input = bus->input;
1da177e4
LT		 1609
1610 switch (event) {
4be44fcd 1611 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
8a681a4d
ZR		 1612 if (brightness_switch_enabled)
1613 acpi_video_switch_brightness(video_device, event);
e9dab196
LY		 1614 keycode = KEY_BRIGHTNESS_CYCLE;
1615 break;
4be44fcd 1616 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
8a681a4d
ZR		 1617 if (brightness_switch_enabled)
1618 acpi_video_switch_brightness(video_device, event);
e9dab196
LY		 1619 keycode = KEY_BRIGHTNESSUP;
1620 break;
4be44fcd 1621 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
8a681a4d
ZR		 1622 if (brightness_switch_enabled)
1623 acpi_video_switch_brightness(video_device, event);
e9dab196
LY		 1624 keycode = KEY_BRIGHTNESSDOWN;
1625 break;
70f23fd6 1626 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
8a681a4d
ZR		 1627 if (brightness_switch_enabled)
1628 acpi_video_switch_brightness(video_device, event);
e9dab196
LY		 1629 keycode = KEY_BRIGHTNESS_ZERO;
1630 break;
4be44fcd 1631 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
8a681a4d
ZR		 1632 if (brightness_switch_enabled)
1633 acpi_video_switch_brightness(video_device, event);
e9dab196 1634 keycode = KEY_DISPLAY_OFF;
1da177e4
LT		 1635 break;
1636 default:
1637 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
4be44fcd 1638 "Unsupported event [0x%x]\n", event));
1da177e4
LT		 1639 break;
1640 }
e9dab196 1641
7761f638 1642 acpi_notifier_call_chain(device, event, 0);
17c452f9
MG		 1643
1644 if (keycode) {
1645 input_report_key(input, keycode, 1);
1646 input_sync(input);
1647 input_report_key(input, keycode, 0);
1648 input_sync(input);
1649 }
e9dab196 1650
d550d98d 1651 return;
1da177e4
LT		 1652}
1653
ac7729da
RW		 1654static int acpi_video_resume(struct notifier_block *nb,
1655 unsigned long val, void *ign)
863c1490
MG		 1656{
1657 struct acpi_video_bus *video;
1658 struct acpi_video_device *video_device;
1659 int i;
1660
ac7729da
RW		 1661 switch (val) {
1662 case PM_HIBERNATION_PREPARE:
1663 case PM_SUSPEND_PREPARE:
1664 case PM_RESTORE_PREPARE:
1665 return NOTIFY_DONE;
1666 }
863c1490 1667
ac7729da
RW		 1668 video = container_of(nb, struct acpi_video_bus, pm_nb);
1669
1670 dev_info(&video->device->dev, "Restoring backlight state\n");
863c1490
MG		 1671
1672 for (i = 0; i < video->attached_count; i++) {
1673 video_device = video->attached_array[i].bind_info;
1674 if (video_device && video_device->backlight)
1675 acpi_video_set_brightness(video_device->backlight);
1676 }
ac7729da
RW		 1677
1678 return NOTIFY_OK;
863c1490
MG		 1679}
1680
c504f8cb
ZR		 1681static acpi_status
1682acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1683 void **return_value)
1684{
1685 struct acpi_device *device = context;
1686 struct acpi_device *sibling;
1687 int result;
1688
1689 if (handle == device->handle)
1690 return AE_CTRL_TERMINATE;
1691
1692 result = acpi_bus_get_device(handle, &sibling);
1693 if (result)
1694 return AE_OK;
1695
1696 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1697 return AE_ALREADY_EXISTS;
1698
1699 return AE_OK;
1700}
1701
67b662e1
AL		 1702static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1703{
99678ed7
HG		 1704 struct backlight_properties props;
1705 struct pci_dev *pdev;
1706 acpi_handle acpi_parent;
1707 struct device *parent = NULL;
1708 int result;
1709 static int count;
1710 char *name;
67b662e1 1711
99678ed7
HG		 1712 result = acpi_video_init_brightness(device);
1713 if (result)
1714 return;
1715 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1716 if (!name)
1717 return;
1718 count++;
67b662e1 1719
99678ed7 1720 acpi_get_parent(device->dev->handle, &acpi_parent);
67b662e1 1721
99678ed7
HG		 1722 pdev = acpi_get_pci_dev(acpi_parent);
1723 if (pdev) {
1724 parent = &pdev->dev;
1725 pci_dev_put(pdev);
1726 }
67b662e1 1727
99678ed7
HG		 1728 memset(&props, 0, sizeof(struct backlight_properties));
1729 props.type = BACKLIGHT_FIRMWARE;
1730 props.max_brightness = device->brightness->count - 3;
1731 device->backlight = backlight_device_register(name,
1732 parent,
1733 device,
1734 &acpi_backlight_ops,
1735 &props);
1736 kfree(name);
1737 if (IS_ERR(device->backlight))
1738 return;
67b662e1 1739
99678ed7
HG		 1740 /*
1741 * Save current brightness level in case we have to restore it
1742 * before acpi_video_device_lcd_set_level() is called next time.
1743 */
1744 device->backlight->props.brightness =
1745 acpi_video_get_brightness(device->backlight);
67b662e1 1746
99678ed7
HG		 1747 device->cooling_dev = thermal_cooling_device_register("LCD",
1748 device->dev, &video_cooling_ops);
1749 if (IS_ERR(device->cooling_dev)) {
1750 /*
1751 * Set cooling_dev to NULL so we don't crash trying to free it.
1752 * Also, why the hell we are returning early and not attempt to
1753 * register video output if cooling device registration failed?
1754 * -- dtor
1755 */
1756 device->cooling_dev = NULL;
1757 return;
67b662e1 1758 }
99678ed7
HG		 1759
1760 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1761 device->cooling_dev->id);
1762 result = sysfs_create_link(&device->dev->dev.kobj,
1763 &device->cooling_dev->device.kobj,
1764 "thermal_cooling");
1765 if (result)
1766 printk(KERN_ERR PREFIX "Create sysfs link\n");
1767 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1768 &device->dev->dev.kobj, "device");
1769 if (result)
1770 printk(KERN_ERR PREFIX "Create sysfs link\n");
67b662e1
AL		 1771}
1772
1773static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1774{
1775 struct acpi_video_device *dev;
1776
53a92ba7
HG		 1777 if (video->backlight_registered)
1778 return 0;
1779
99678ed7
HG		 1780 if (!acpi_video_verify_backlight_support())
1781 return 0;
1782
67b662e1
AL		 1783 mutex_lock(&video->device_list_lock);
1784 list_for_each_entry(dev, &video->video_device_list, entry)
1785 acpi_video_dev_register_backlight(dev);
1786 mutex_unlock(&video->device_list_lock);
1787
99678ed7
HG		 1788 video->backlight_registered = true;
1789
67b662e1
AL		 1790 video->pm_nb.notifier_call = acpi_video_resume;
1791 video->pm_nb.priority = 0;
1792 return register_pm_notifier(&video->pm_nb);
1793}
1794
1795static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1796{
1797 if (device->backlight) {
1798 backlight_device_unregister(device->backlight);
1799 device->backlight = NULL;
1800 }
1801 if (device->brightness) {
1802 kfree(device->brightness->levels);
1803 kfree(device->brightness);
1804 device->brightness = NULL;
1805 }
1806 if (device->cooling_dev) {
1807 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1808 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1809 thermal_cooling_device_unregister(device->cooling_dev);
1810 device->cooling_dev = NULL;
1811 }
1812}
1813
1814static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1815{
1816 struct acpi_video_device *dev;
99678ed7
HG		 1817 int error;
1818
1819 if (!video->backlight_registered)
1820 return 0;
1821
1822 error = unregister_pm_notifier(&video->pm_nb);
67b662e1
AL		 1823
1824 mutex_lock(&video->device_list_lock);
1825 list_for_each_entry(dev, &video->video_device_list, entry)
1826 acpi_video_dev_unregister_backlight(dev);
1827 mutex_unlock(&video->device_list_lock);
1828
99678ed7
HG		 1829 video->backlight_registered = false;
1830
67b662e1
AL		 1831 return error;
1832}
1833
1834static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1835{
1836 acpi_status status;
1837 struct acpi_device *adev = device->dev;
1838
1839 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1840 acpi_video_device_notify, device);
1841 if (ACPI_FAILURE(status))
1842 dev_err(&adev->dev, "Error installing notify handler\n");
1843 else
1844 device->flags.notify = 1;
1845}
1846
1847static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1848{
1849 struct input_dev *input;
1850 struct acpi_video_device *dev;
1851 int error;
1852
1853 video->input = input = input_allocate_device();
1854 if (!input) {
1855 error = -ENOMEM;
1856 goto out;
1857 }
1858
1859 error = acpi_video_bus_start_devices(video);
1860 if (error)
1861 goto err_free_input;
1862
1863 snprintf(video->phys, sizeof(video->phys),
1864 "%s/video/input0", acpi_device_hid(video->device));
1865
1866 input->name = acpi_device_name(video->device);
1867 input->phys = video->phys;
1868 input->id.bustype = BUS_HOST;
1869 input->id.product = 0x06;
1870 input->dev.parent = &video->device->dev;
1871 input->evbit[0] = BIT(EV_KEY);
1872 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1873 set_bit(KEY_VIDEO_NEXT, input->keybit);
1874 set_bit(KEY_VIDEO_PREV, input->keybit);
1875 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1876 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1877 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1878 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1879 set_bit(KEY_DISPLAY_OFF, input->keybit);
1880
1881 error = input_register_device(input);
1882 if (error)
1883 goto err_stop_dev;
1884
1885 mutex_lock(&video->device_list_lock);
1886 list_for_each_entry(dev, &video->video_device_list, entry)
1887 acpi_video_dev_add_notify_handler(dev);
1888 mutex_unlock(&video->device_list_lock);
1889
1890 return 0;
1891
1892err_stop_dev:
1893 acpi_video_bus_stop_devices(video);
1894err_free_input:
1895 input_free_device(input);
1896 video->input = NULL;
1897out:
1898 return error;
1899}
1900
1901static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1902{
1903 if (dev->flags.notify) {
1904 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1905 acpi_video_device_notify);
1906 dev->flags.notify = 0;
1907 }
1908}
1909
1910static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1911{
1912 struct acpi_video_device *dev;
1913
1914 mutex_lock(&video->device_list_lock);
1915 list_for_each_entry(dev, &video->video_device_list, entry)
1916 acpi_video_dev_remove_notify_handler(dev);
1917 mutex_unlock(&video->device_list_lock);
1918
1919 acpi_video_bus_stop_devices(video);
1920 input_unregister_device(video->input);
1921 video->input = NULL;
1922}
1923
53a92ba7
HG		 1924static int acpi_video_backlight_notify(struct notifier_block *nb,
1925 unsigned long val, void *bd)
1926{
1927 struct backlight_device *backlight = bd;
1928 struct acpi_video_bus *video;
1929
1930 /* acpi_video_verify_backlight_support only cares about raw devices */
1931 if (backlight->props.type != BACKLIGHT_RAW)
1932 return NOTIFY_DONE;
1933
1934 video = container_of(nb, struct acpi_video_bus, backlight_nb);
1935
1936 switch (val) {
1937 case BACKLIGHT_REGISTERED:
1938 if (!acpi_video_verify_backlight_support())
1939 acpi_video_bus_unregister_backlight(video);
1940 break;
1941 case BACKLIGHT_UNREGISTERED:
1942 acpi_video_bus_register_backlight(video);
1943 break;
1944 }
1945
1946 return NOTIFY_OK;
1947}
1948
1949static int acpi_video_bus_add_backlight_notify_handler(
1950 struct acpi_video_bus *video)
1951{
1952 int error;
1953
1954 video->backlight_nb.notifier_call = acpi_video_backlight_notify;
1955 video->backlight_nb.priority = 0;
1956 error = backlight_register_notifier(&video->backlight_nb);
1957 if (error == 0)
1958 video->backlight_notifier_registered = true;
1959
1960 return error;
1961}
1962
1963static int acpi_video_bus_remove_backlight_notify_handler(
1964 struct acpi_video_bus *video)
1965{
1966 if (!video->backlight_notifier_registered)
1967 return 0;
1968
1969 video->backlight_notifier_registered = false;
1970
1971 return backlight_unregister_notifier(&video->backlight_nb);
1972}
1973
67b662e1
AL		 1974static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1975{
1976 struct acpi_video_device *dev, *next;
1977
1978 mutex_lock(&video->device_list_lock);
1979 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1980 list_del(&dev->entry);
1981 kfree(dev);
1982 }
1983 mutex_unlock(&video->device_list_lock);
1984
1985 return 0;
1986}
1987
ac7729da
RW		 1988static int instance;
1989
4be44fcd 1990static int acpi_video_bus_add(struct acpi_device *device)
1da177e4 1991{
f51e8391 1992 struct acpi_video_bus *video;
f51e8391 1993 int error;
c504f8cb
ZR		 1994 acpi_status status;
1995
1996 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1997 device->parent->handle, 1,
1998 acpi_video_bus_match, NULL,
1999 device, NULL);
2000 if (status == AE_ALREADY_EXISTS) {
2001 printk(KERN_WARNING FW_BUG
2002 "Duplicate ACPI video bus devices for the"
2003 " same VGA controller, please try module "
2004 "parameter \"video.allow_duplicates=1\""
2005 "if the current driver doesn't work.\n");
2006 if (!allow_duplicates)
2007 return -ENODEV;
2008 }
1da177e4 2009
36bcbec7 2010 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1da177e4 2011 if (!video)
d550d98d 2012 return -ENOMEM;
1da177e4 2013
e6d9da1d
ZR		 2014 /* a hack to fix the duplicate name "VID" problem on T61 */
2015 if (!strcmp(device->pnp.bus_id, "VID")) {
2016 if (instance)
2017 device->pnp.bus_id[3] = '0' + instance;
915ea7e4 2018 instance++;
e6d9da1d 2019 }
f3b39f13
ZY		 2020 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2021 if (!strcmp(device->pnp.bus_id, "VGA")) {
2022 if (instance)
2023 device->pnp.bus_id[3] = '0' + instance;
2024 instance++;
2025 }
e6d9da1d 2026
e6afa0de 2027 video->device = device;
1da177e4
LT		 2028 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2029 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
db89b4f0 2030 device->driver_data = video;
1da177e4
LT		 2031
2032 acpi_video_bus_find_cap(video);
f51e8391
DT		 2033 error = acpi_video_bus_check(video);
2034 if (error)
2035 goto err_free_video;
1da177e4 2036
bbac81f5 2037 mutex_init(&video->device_list_lock);
1da177e4
LT		 2038 INIT_LIST_HEAD(&video->video_device_list);
2039
ea9f8856
IM		 2040 error = acpi_video_bus_get_devices(video, device);
2041 if (error)
91e13aa3 2042 goto err_put_video;
1da177e4 2043
1da177e4 2044 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
4be44fcd
LB		 2045 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2046 video->flags.multihead ? "yes" : "no",
2047 video->flags.rom ? "yes" : "no",
2048 video->flags.post ? "yes" : "no");
67b662e1
AL		 2049 mutex_lock(&video_list_lock);
2050 list_add_tail(&video->entry, &video_bus_head);
2051 mutex_unlock(&video_list_lock);
1da177e4 2052
67b662e1
AL		 2053 acpi_video_bus_register_backlight(video);
2054 acpi_video_bus_add_notify_handler(video);
53a92ba7 2055 acpi_video_bus_add_backlight_notify_handler(video);
ac7729da 2056
f51e8391
DT		 2057 return 0;
2058
67b662e1 2059err_put_video:
f51e8391
DT		 2060 acpi_video_bus_put_devices(video);
2061 kfree(video->attached_array);
67b662e1 2062err_free_video:
f51e8391 2063 kfree(video);
db89b4f0 2064 device->driver_data = NULL;
1da177e4 2065
f51e8391 2066 return error;
1da177e4
LT		 2067}
2068
51fac838 2069static int acpi_video_bus_remove(struct acpi_device *device)
1da177e4 2070{
4be44fcd 2071 struct acpi_video_bus *video = NULL;
1da177e4 2072
1da177e4
LT		 2073
2074 if (!device || !acpi_driver_data(device))
d550d98d 2075 return -EINVAL;
1da177e4 2076
50dd0969 2077 video = acpi_driver_data(device);
1da177e4 2078
53a92ba7 2079 acpi_video_bus_remove_backlight_notify_handler(video);
67b662e1
AL		 2080 acpi_video_bus_remove_notify_handler(video);
2081 acpi_video_bus_unregister_backlight(video);
1da177e4 2082 acpi_video_bus_put_devices(video);
1da177e4 2083
67b662e1
AL		 2084 mutex_lock(&video_list_lock);
2085 list_del(&video->entry);
2086 mutex_unlock(&video_list_lock);
2087
6044ec88 2088 kfree(video->attached_array);
1da177e4
LT		 2089 kfree(video);
2090
d550d98d 2091 return 0;
1da177e4
LT		 2092}
2093
c6996bdd
AC		 2094static int __init is_i740(struct pci_dev *dev)
2095{
2096 if (dev->device == 0x00D1)
2097 return 1;
2098 if (dev->device == 0x7000)
2099 return 1;
2100 return 0;
2101}
2102
74a365b3
MG		 2103static int __init intel_opregion_present(void)
2104{
c6996bdd 2105 int opregion = 0;
74a365b3
MG		 2106 struct pci_dev *dev = NULL;
2107 u32 address;
2108
2109 for_each_pci_dev(dev) {
2110 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2111 continue;
2112 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2113 continue;
c6996bdd
AC		 2114 /* We don't want to poke around undefined i740 registers */
2115 if (is_i740(dev))
2116 continue;
74a365b3
MG		 2117 pci_read_config_dword(dev, 0xfc, &address);
2118 if (!address)
2119 continue;
c6996bdd 2120 opregion = 1;
74a365b3 2121 }
c6996bdd 2122 return opregion;
74a365b3
MG		 2123}
2124
8e5c2b77 2125int acpi_video_register(void)
1da177e4 2126{
8e5c2b77 2127 int result = 0;
86e437f0
ZY		 2128 if (register_count) {
2129 /*
8e5c2b77
RW		 2130 * if the function of acpi_video_register is already called,
2131 * don't register the acpi_vide_bus again and return no error.
86e437f0
ZY		 2132 */
2133 return 0;
2134 }
1da177e4 2135
67b662e1
AL		 2136 mutex_init(&video_list_lock);
2137 INIT_LIST_HEAD(&video_bus_head);
2138
1da177e4 2139 result = acpi_bus_register_driver(&acpi_video_bus);
39fe394d 2140 if (result < 0)
d550d98d 2141 return -ENODEV;
1da177e4 2142
86e437f0
ZY		 2143 /*
2144 * When the acpi_video_bus is loaded successfully, increase
2145 * the counter reference.
2146 */
2147 register_count = 1;
2148
d550d98d 2149 return 0;
1da177e4 2150}
8e5c2b77 2151EXPORT_SYMBOL(acpi_video_register);
74a365b3 2152
86e437f0
ZY		 2153void acpi_video_unregister(void)
2154{
2155 if (!register_count) {
2156 /*
2157 * If the acpi video bus is already unloaded, don't
2158 * unload it again and return directly.
2159 */
2160 return;
2161 }
2162 acpi_bus_unregister_driver(&acpi_video_bus);
2163
86e437f0
ZY		 2164 register_count = 0;
2165
2166 return;
2167}
2168EXPORT_SYMBOL(acpi_video_unregister);
2169
1b7f37e1
HG		 2170void acpi_video_unregister_backlight(void)
2171{
2172 struct acpi_video_bus *video;
2173
2174 if (!register_count)
2175 return;
2176
2177 mutex_lock(&video_list_lock);
2178 list_for_each_entry(video, &video_bus_head, entry)
2179 acpi_video_bus_unregister_backlight(video);
2180 mutex_unlock(&video_list_lock);
2181}
2182EXPORT_SYMBOL(acpi_video_unregister_backlight);
2183
74a365b3
MG		 2184/*
2185 * This is kind of nasty. Hardware using Intel chipsets may require
2186 * the video opregion code to be run first in order to initialise
2187 * state before any ACPI video calls are made. To handle this we defer
2188 * registration of the video class until the opregion code has run.
2189 */
2190
2191static int __init acpi_video_init(void)
2192{
45cb50e6
ZR		 2193 dmi_check_system(video_dmi_table);
2194
74a365b3
MG		 2195 if (intel_opregion_present())
2196 return 0;
2197
2198 return acpi_video_register();
2199}
1da177e4 2200
86e437f0 2201static void __exit acpi_video_exit(void)
1da177e4 2202{
86e437f0 2203 acpi_video_unregister();
1da177e4 2204
d550d98d 2205 return;
1da177e4
LT		 2206}
2207
2208module_init(acpi_video_init);
2209module_exit(acpi_video_exit);
Linux kernel - Deliverables
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