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ACPI / video: Fix use_native_backlight selection logic
[mirror_ubuntu-artful-kernel.git] / drivers / acpi / video.c
CommitLineData
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
2843768b 71static bool brightness_switch_enabled = 1;
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 */
25294e9f 85static int use_native_backlight_param = -1;
0e9f81d3 86module_param_named(use_native_backlight, use_native_backlight_param, int, 0444);
25294e9f 87static bool use_native_backlight_dmi = true;
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;
8ab58e8e
LT		 207 struct delayed_work switch_brightness_work;
208 int switch_brightness_event;
4be44fcd
LB		 209 struct acpi_video_bus *video;
210 struct acpi_device *dev;
1da177e4 211 struct acpi_video_device_brightness *brightness;
2f3d000a 212 struct backlight_device *backlight;
4a703a8f 213 struct thermal_cooling_device *cooling_dev;
1da177e4
LT		 214};
215
b7171ae7 216static const char device_decode[][30] = {
1da177e4
LT		 217 "motherboard VGA device",
218 "PCI VGA device",
219 "AGP VGA device",
220 "UNKNOWN",
221};
222
4be44fcd
LB		 223static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
224static void acpi_video_device_rebind(struct acpi_video_bus *video);
225static void acpi_video_device_bind(struct acpi_video_bus *video,
226 struct acpi_video_device *device);
1da177e4 227static int acpi_video_device_enumerate(struct acpi_video_bus *video);
2f3d000a
YL		 228static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
229 int level);
230static int acpi_video_device_lcd_get_level_current(
231 struct acpi_video_device *device,
a89803df 232 unsigned long long *level, bool raw);
4be44fcd
LB		 233static int acpi_video_get_next_level(struct acpi_video_device *device,
234 u32 level_current, u32 event);
8ab58e8e 235static void acpi_video_switch_brightness(struct work_struct *work);
1da177e4 236
0e9f81d3
AL		 237static bool acpi_video_use_native_backlight(void)
238{
239 if (use_native_backlight_param != -1)
240 return use_native_backlight_param;
241 else
242 return use_native_backlight_dmi;
243}
244
0b9f7d93 245bool acpi_video_verify_backlight_support(void)
fbc9fe1b 246{
0e9f81d3 247 if (acpi_osi_is_win8() && acpi_video_use_native_backlight() &&
fbc9fe1b
AL		 248 backlight_device_registered(BACKLIGHT_RAW))
249 return false;
250 return acpi_video_backlight_support();
251}
0b9f7d93 252EXPORT_SYMBOL_GPL(acpi_video_verify_backlight_support);
fbc9fe1b 253
21fcb34e 254/* backlight device sysfs support */
2f3d000a
YL		 255static int acpi_video_get_brightness(struct backlight_device *bd)
256{
27663c58 257 unsigned long long cur_level;
38531e6f 258 int i;
7c364e79 259 struct acpi_video_device *vd = bl_get_data(bd);
c8890f90 260
a89803df 261 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
c8890f90 262 return -EINVAL;
38531e6f
MG		 263 for (i = 2; i < vd->brightness->count; i++) {
264 if (vd->brightness->levels[i] == cur_level)
21fcb34e
FC		 265 /*
266 * The first two entries are special - see page 575
267 * of the ACPI spec 3.0
268 */
915ea7e4 269 return i - 2;
38531e6f
MG		 270 }
271 return 0;
2f3d000a
YL		 272}
273
274static int acpi_video_set_brightness(struct backlight_device *bd)
275{
24450c7a 276 int request_level = bd->props.brightness + 2;
7c364e79 277 struct acpi_video_device *vd = bl_get_data(bd);
24450c7a 278
8ab58e8e 279 cancel_delayed_work(&vd->switch_brightness_work);
24450c7a
ZR		 280 return acpi_video_device_lcd_set_level(vd,
281 vd->brightness->levels[request_level]);
2f3d000a
YL		 282}
283
acc2472e 284static const struct backlight_ops acpi_backlight_ops = {
599a52d1
RP		 285 .get_brightness = acpi_video_get_brightness,
286 .update_status = acpi_video_set_brightness,
287};
288
702ed512 289/* thermal cooling device callbacks */
4a703a8f 290static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
6503e5df 291 long *state)
702ed512 292{
4a703a8f 293 struct acpi_device *device = cooling_dev->devdata;
702ed512
ZR		 294 struct acpi_video_device *video = acpi_driver_data(device);
295
6503e5df
MG		 296 *state = video->brightness->count - 3;
297 return 0;
702ed512
ZR		 298}
299
4a703a8f 300static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
6503e5df 301 long *state)
702ed512 302{
4a703a8f 303 struct acpi_device *device = cooling_dev->devdata;
702ed512 304 struct acpi_video_device *video = acpi_driver_data(device);
27663c58 305 unsigned long long level;
6503e5df 306 int offset;
702ed512 307
a89803df 308 if (acpi_video_device_lcd_get_level_current(video, &level, false))
c8890f90 309 return -EINVAL;
6503e5df
MG		 310 for (offset = 2; offset < video->brightness->count; offset++)
311 if (level == video->brightness->levels[offset]) {
312 *state = video->brightness->count - offset - 1;
313 return 0;
314 }
702ed512
ZR		 315
316 return -EINVAL;
317}
318
319static int
4a703a8f 320video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
702ed512 321{
4a703a8f 322 struct acpi_device *device = cooling_dev->devdata;
702ed512
ZR		 323 struct acpi_video_device *video = acpi_driver_data(device);
324 int level;
325
915ea7e4 326 if (state >= video->brightness->count - 2)
702ed512
ZR		 327 return -EINVAL;
328
329 state = video->brightness->count - state;
915ea7e4 330 level = video->brightness->levels[state - 1];
702ed512
ZR		 331 return acpi_video_device_lcd_set_level(video, level);
332}
333
9c8b04be 334static const struct thermal_cooling_device_ops video_cooling_ops = {
702ed512
ZR		 335 .get_max_state = video_get_max_state,
336 .get_cur_state = video_get_cur_state,
337 .set_cur_state = video_set_cur_state,
338};
339
21fcb34e
FC		 340/*
341 * --------------------------------------------------------------------------
342 * Video Management
343 * --------------------------------------------------------------------------
344 */
1da177e4 345
1da177e4 346static int
4be44fcd
LB		 347acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
348 union acpi_object **levels)
1da177e4 349{
4be44fcd
LB		 350 int status;
351 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
352 union acpi_object *obj;
1da177e4 353
1da177e4
LT		 354
355 *levels = NULL;
356
90130268 357 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
1da177e4 358 if (!ACPI_SUCCESS(status))
d550d98d 359 return status;
4be44fcd 360 obj = (union acpi_object *)buffer.pointer;
6665bda7 361 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
6468463a 362 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
1da177e4
LT		 363 status = -EFAULT;
364 goto err;
365 }
366
367 *levels = obj;
368
d550d98d 369 return 0;
1da177e4 370
915ea7e4 371err:
6044ec88 372 kfree(buffer.pointer);
1da177e4 373
d550d98d 374 return status;
1da177e4
LT		 375}
376
377static int
4be44fcd 378acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
1da177e4 379{
24450c7a 380 int status;
9e6dada9 381 int state;
1da177e4 382
0db98202
JL		 383 status = acpi_execute_simple_method(device->dev->handle,
384 "_BCM", level);
24450c7a
ZR		 385 if (ACPI_FAILURE(status)) {
386 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
387 return -EIO;
388 }
389
4500ca8e 390 device->brightness->curr = level;
9e6dada9 391 for (state = 2; state < device->brightness->count; state++)
24450c7a 392 if (level == device->brightness->levels[state]) {
1a7c618a
ZR		 393 if (device->backlight)
394 device->backlight->props.brightness = state - 2;
24450c7a
ZR		 395 return 0;
396 }
9e6dada9 397
24450c7a
ZR		 398 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
399 return -EINVAL;
1da177e4
LT		 400}
401
45cb50e6
ZR		 402/*
403 * For some buggy _BQC methods, we need to add a constant value to
404 * the _BQC return value to get the actual current brightness level
405 */
406
407static int bqc_offset_aml_bug_workaround;
408static int __init video_set_bqc_offset(const struct dmi_system_id *d)
409{
410 bqc_offset_aml_bug_workaround = 9;
411 return 0;
412}
413
0e9f81d3
AL		 414static int __init video_set_use_native_backlight(const struct dmi_system_id *d)
415{
416 use_native_backlight_dmi = true;
417 return 0;
418}
419
45cb50e6
ZR		 420static struct dmi_system_id video_dmi_table[] __initdata = {
421 /*
422 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
423 */
424 {
425 .callback = video_set_bqc_offset,
426 .ident = "Acer Aspire 5720",
427 .matches = {
428 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
429 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
430 },
431 },
5afc4abe
LB		 432 {
433 .callback = video_set_bqc_offset,
434 .ident = "Acer Aspire 5710Z",
435 .matches = {
436 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
437 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
438 },
439 },
34ac272b
ZR		 440 {
441 .callback = video_set_bqc_offset,
442 .ident = "eMachines E510",
443 .matches = {
444 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
445 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
446 },
447 },
93bcece2
ZR		 448 {
449 .callback = video_set_bqc_offset,
450 .ident = "Acer Aspire 5315",
451 .matches = {
452 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
453 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
454 },
455 },
152a4e63
ZR		 456 {
457 .callback = video_set_bqc_offset,
458 .ident = "Acer Aspire 7720",
459 .matches = {
460 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
461 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
462 },
463 },
6d6b20b2
HG		 464 {
465 .callback = video_set_use_native_backlight,
466 .ident = "ThinkPad X230",
467 .matches = {
468 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
469 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X230"),
470 },
471 },
0e9f81d3
AL		 472 {
473 .callback = video_set_use_native_backlight,
43d94902 474 .ident = "ThinkPad T430 and T430s",
0e9f81d3
AL		 475 .matches = {
476 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
43d94902 477 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T430"),
0e9f81d3
AL		 478 },
479 },
480 {
481 .callback = video_set_use_native_backlight,
6d6b20b2 482 .ident = "ThinkPad T430",
0e9f81d3
AL		 483 .matches = {
484 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
6d6b20b2
HG		 485 DMI_MATCH(DMI_PRODUCT_VERSION, "2349D15"),
486 },
487 },
488 {
489 .callback = video_set_use_native_backlight,
490 .ident = "ThinkPad T431s",
491 .matches = {
492 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
493 DMI_MATCH(DMI_PRODUCT_VERSION, "20AACTO1WW"),
494 },
495 },
496 {
497 .callback = video_set_use_native_backlight,
498 .ident = "ThinkPad Edge E530",
499 .matches = {
500 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
501 DMI_MATCH(DMI_PRODUCT_VERSION, "3259A2G"),
502 },
503 },
504 {
505 .callback = video_set_use_native_backlight,
506 .ident = "ThinkPad Edge E530",
507 .matches = {
508 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
509 DMI_MATCH(DMI_PRODUCT_VERSION, "3259CTO"),
510 },
511 },
512 {
513 .callback = video_set_use_native_backlight,
514 .ident = "ThinkPad Edge E530",
515 .matches = {
516 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
517 DMI_MATCH(DMI_PRODUCT_VERSION, "3259HJG"),
0e9f81d3
AL		 518 },
519 },
1e815db6
HG		 520 {
521 .callback = video_set_use_native_backlight,
522 .ident = "ThinkPad W530",
523 .matches = {
524 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
525 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad W530"),
526 },
527 },
43d94902
HG		 528 {
529 .callback = video_set_use_native_backlight,
0e9f81d3
AL		 530 .ident = "ThinkPad X1 Carbon",
531 .matches = {
532 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
533 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X1 Carbon"),
534 },
535 },
536 {
537 .callback = video_set_use_native_backlight,
538 .ident = "Lenovo Yoga 13",
539 .matches = {
540 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
541 DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo IdeaPad Yoga 13"),
542 },
543 },
0dc6b96a
HG		 544 {
545 .callback = video_set_use_native_backlight,
546 .ident = "Lenovo Yoga 2 11",
547 .matches = {
548 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
549 DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo Yoga 2 11"),
550 },
551 },
997dd7fe
SCP		 552 {
553 .callback = video_set_use_native_backlight,
554 .ident = "Thinkpad Helix",
555 .matches = {
556 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
557 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad Helix"),
558 },
559 },
0e9f81d3
AL		 560 {
561 .callback = video_set_use_native_backlight,
562 .ident = "Dell Inspiron 7520",
563 .matches = {
564 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
5ff365fb 565 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7520"),
0e9f81d3
AL		 566 },
567 },
568 {
569 .callback = video_set_use_native_backlight,
570 .ident = "Acer Aspire 5733Z",
571 .matches = {
572 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
573 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5733Z"),
574 },
575 },
43d94902
HG		 576 {
577 .callback = video_set_use_native_backlight,
578 .ident = "Acer Aspire 5742G",
579 .matches = {
580 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
581 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5742G"),
582 },
583 },
0dc6b96a
HG		 584 {
585 .callback = video_set_use_native_backlight,
586 .ident = "Acer Aspire V5-171",
587 .matches = {
588 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
589 DMI_MATCH(DMI_PRODUCT_NAME, "V5-171"),
590 },
591 },
0e9f81d3
AL		 592 {
593 .callback = video_set_use_native_backlight,
594 .ident = "Acer Aspire V5-431",
595 .matches = {
596 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
597 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-431"),
598 },
599 },
0dc6b96a
HG		 600 {
601 .callback = video_set_use_native_backlight,
602 .ident = "Acer Aspire V5-471G",
603 .matches = {
604 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
605 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-471G"),
606 },
607 },
ab7027de
MK		 608 {
609 .callback = video_set_use_native_backlight,
610 .ident = "Acer TravelMate B113",
611 .matches = {
612 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
613 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate B113"),
614 },
615 },
6d6b20b2
HG		 616 {
617 .callback = video_set_use_native_backlight,
618 .ident = "Acer Aspire V5-572G",
619 .matches = {
620 DMI_MATCH(DMI_SYS_VENDOR, "Acer Aspire"),
621 DMI_MATCH(DMI_PRODUCT_VERSION, "V5-572G/Dazzle_CX"),
622 },
623 },
624 {
625 .callback = video_set_use_native_backlight,
626 .ident = "Acer Aspire V5-573G",
627 .matches = {
628 DMI_MATCH(DMI_SYS_VENDOR, "Acer Aspire"),
629 DMI_MATCH(DMI_PRODUCT_VERSION, "V5-573G/Dazzle_HW"),
630 },
631 },
632 {
633 .callback = video_set_use_native_backlight,
634 .ident = "ASUS Zenbook Prime UX31A",
635 .matches = {
636 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
637 DMI_MATCH(DMI_PRODUCT_NAME, "UX31A"),
638 },
639 },
0e9f81d3
AL		 640 {
641 .callback = video_set_use_native_backlight,
642 .ident = "HP ProBook 4340s",
643 .matches = {
644 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
645 DMI_MATCH(DMI_PRODUCT_VERSION, "HP ProBook 4340s"),
646 },
647 },
648 {
649 .callback = video_set_use_native_backlight,
4cf465b5
HG		 650 .ident = "HP ProBook 4540s",
651 .matches = {
652 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
653 DMI_MATCH(DMI_PRODUCT_VERSION, "HP ProBook 4540s"),
654 },
655 },
656 {
657 .callback = video_set_use_native_backlight,
0e9f81d3
AL		 658 .ident = "HP ProBook 2013 models",
659 .matches = {
660 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
661 DMI_MATCH(DMI_PRODUCT_NAME, "HP ProBook "),
662 DMI_MATCH(DMI_PRODUCT_NAME, " G1"),
663 },
664 },
665 {
666 .callback = video_set_use_native_backlight,
667 .ident = "HP EliteBook 2013 models",
668 .matches = {
669 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
670 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook "),
671 DMI_MATCH(DMI_PRODUCT_NAME, " G1"),
672 },
673 },
674 {
675 .callback = video_set_use_native_backlight,
7f94fde6
HG		 676 .ident = "HP EliteBook 2014 models",
677 .matches = {
678 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
679 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook "),
680 DMI_MATCH(DMI_PRODUCT_NAME, " G2"),
681 },
682 },
683 {
684 .callback = video_set_use_native_backlight,
0e9f81d3
AL		 685 .ident = "HP ZBook 14",
686 .matches = {
687 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
688 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 14"),
689 },
690 },
691 {
692 .callback = video_set_use_native_backlight,
693 .ident = "HP ZBook 15",
694 .matches = {
695 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
696 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 15"),
697 },
698 },
699 {
700 .callback = video_set_use_native_backlight,
701 .ident = "HP ZBook 17",
702 .matches = {
703 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
704 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 17"),
705 },
706 },
707 {
708 .callback = video_set_use_native_backlight,
0dc6b96a
HG		 709 .ident = "HP EliteBook 8470p",
710 .matches = {
711 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
712 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8470p"),
713 },
714 },
715 {
716 .callback = video_set_use_native_backlight,
0e9f81d3
AL		 717 .ident = "HP EliteBook 8780w",
718 .matches = {
719 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
720 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8780w"),
721 },
722 },
45cb50e6
ZR		 723 {}
724};
725
994fa63c
DB		 726static unsigned long long
727acpi_video_bqc_value_to_level(struct acpi_video_device *device,
728 unsigned long long bqc_value)
729{
730 unsigned long long level;
731
732 if (device->brightness->flags._BQC_use_index) {
733 /*
734 * _BQC returns an index that doesn't account for
735 * the first 2 items with special meaning, so we need
736 * to compensate for that by offsetting ourselves
737 */
738 if (device->brightness->flags._BCL_reversed)
739 bqc_value = device->brightness->count - 3 - bqc_value;
740
741 level = device->brightness->levels[bqc_value + 2];
742 } else {
743 level = bqc_value;
744 }
745
746 level += bqc_offset_aml_bug_workaround;
747
748 return level;
749}
750
1da177e4 751static int
4be44fcd 752acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
a89803df 753 unsigned long long *level, bool raw)
1da177e4 754{
c8890f90 755 acpi_status status = AE_OK;
4e231fa4 756 int i;
c8890f90 757
c60d638e
ZR		 758 if (device->cap._BQC || device->cap._BCQ) {
759 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
760
761 status = acpi_evaluate_integer(device->dev->handle, buf,
c8890f90
ZR		 762 NULL, level);
763 if (ACPI_SUCCESS(status)) {
a89803df
DB		 764 if (raw) {
765 /*
766 * Caller has indicated he wants the raw
767 * value returned by _BQC, so don't furtherly
768 * mess with the value.
769 */
770 return 0;
771 }
772
994fa63c 773 *level = acpi_video_bqc_value_to_level(device, *level);
1a7c618a 774
4e231fa4
VS		 775 for (i = 2; i < device->brightness->count; i++)
776 if (device->brightness->levels[i] == *level) {
777 device->brightness->curr = *level;
778 return 0;
915ea7e4 779 }
a89803df
DB		 780 /*
781 * BQC returned an invalid level.
782 * Stop using it.
783 */
784 ACPI_WARNING((AE_INFO,
785 "%s returned an invalid level",
786 buf));
787 device->cap._BQC = device->cap._BCQ = 0;
c8890f90 788 } else {
21fcb34e
FC		 789 /*
790 * Fixme:
c8890f90
ZR		 791 * should we return an error or ignore this failure?
792 * dev->brightness->curr is a cached value which stores
793 * the correct current backlight level in most cases.
794 * ACPI video backlight still works w/ buggy _BQC.
795 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
796 */
c60d638e
ZR		 797 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
798 device->cap._BQC = device->cap._BCQ = 0;
c8890f90
ZR		 799 }
800 }
801
4500ca8e 802 *level = device->brightness->curr;
c8890f90 803 return 0;
1da177e4
LT		 804}
805
806static int
4be44fcd
LB		 807acpi_video_device_EDID(struct acpi_video_device *device,
808 union acpi_object **edid, ssize_t length)
1da177e4 809{
4be44fcd
LB		 810 int status;
811 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
812 union acpi_object *obj;
813 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
814 struct acpi_object_list args = { 1, &arg0 };
1da177e4 815
1da177e4
LT		 816
817 *edid = NULL;
818
819 if (!device)
d550d98d 820 return -ENODEV;
1da177e4
LT		 821 if (length == 128)
822 arg0.integer.value = 1;
823 else if (length == 256)
824 arg0.integer.value = 2;
825 else
d550d98d 826 return -EINVAL;
1da177e4 827
90130268 828 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
1da177e4 829 if (ACPI_FAILURE(status))
d550d98d 830 return -ENODEV;
1da177e4 831
50dd0969 832 obj = buffer.pointer;
1da177e4
LT		 833
834 if (obj && obj->type == ACPI_TYPE_BUFFER)
835 *edid = obj;
836 else {
6468463a 837 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
1da177e4
LT		 838 status = -EFAULT;
839 kfree(obj);
840 }
841
d550d98d 842 return status;
1da177e4
LT		 843}
844
1da177e4
LT		 845/* bus */
846
1da177e4
LT		 847/*
848 * Arg:
21fcb34e
FC		 849 * video : video bus device pointer
850 * bios_flag :
1da177e4
LT		 851 * 0. The system BIOS should NOT automatically switch(toggle)
852 * the active display output.
853 * 1. The system BIOS should automatically switch (toggle) the
98fb8fe1 854 * active display output. No switch event.
1da177e4
LT		 855 * 2. The _DGS value should be locked.
856 * 3. The system BIOS should not automatically switch (toggle) the
857 * active display output, but instead generate the display switch
858 * event notify code.
859 * lcd_flag :
860 * 0. The system BIOS should automatically control the brightness level
98fb8fe1 861 * of the LCD when the power changes from AC to DC
21fcb34e 862 * 1. The system BIOS should NOT automatically control the brightness
98fb8fe1 863 * level of the LCD when the power changes from AC to DC.
21fcb34e 864 * Return Value:
ea9f8856 865 * -EINVAL wrong arg.
1da177e4
LT		 866 */
867
868static int
4be44fcd 869acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
1da177e4 870{
ea9f8856 871 acpi_status status;
1da177e4 872
b0373843
ZR		 873 if (!video->cap._DOS)
874 return 0;
1da177e4 875
ea9f8856
IM		 876 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
877 return -EINVAL;
0db98202
JL		 878 video->dos_setting = (lcd_flag << 2) | bios_flag;
879 status = acpi_execute_simple_method(video->device->handle, "_DOS",
880 (lcd_flag << 2) | bios_flag);
ea9f8856
IM		 881 if (ACPI_FAILURE(status))
882 return -EIO;
1da177e4 883
ea9f8856 884 return 0;
1da177e4
LT		 885}
886
935e5f29
ZR		 887/*
888 * Simple comparison function used to sort backlight levels.
889 */
890
891static int
892acpi_video_cmp_level(const void *a, const void *b)
893{
894 return *(int *)a - *(int *)b;
895}
896
a50188da
AL		 897/*
898 * Decides if _BQC/_BCQ for this system is usable
899 *
900 * We do this by changing the level first and then read out the current
901 * brightness level, if the value does not match, find out if it is using
902 * index. If not, clear the _BQC/_BCQ capability.
903 */
904static int acpi_video_bqc_quirk(struct acpi_video_device *device,
905 int max_level, int current_level)
906{
907 struct acpi_video_device_brightness *br = device->brightness;
908 int result;
909 unsigned long long level;
910 int test_level;
911
912 /* don't mess with existing known broken systems */
913 if (bqc_offset_aml_bug_workaround)
914 return 0;
915
916 /*
917 * Some systems always report current brightness level as maximum
918 * through _BQC, we need to test another value for them.
919 */
b3b301c5 920 test_level = current_level == max_level ? br->levels[3] : max_level;
a50188da
AL		 921
922 result = acpi_video_device_lcd_set_level(device, test_level);
923 if (result)
924 return result;
925
926 result = acpi_video_device_lcd_get_level_current(device, &level, true);
927 if (result)
928 return result;
929
930 if (level != test_level) {
931 /* buggy _BQC found, need to find out if it uses index */
932 if (level < br->count) {
933 if (br->flags._BCL_reversed)
934 level = br->count - 3 - level;
935 if (br->levels[level + 2] == test_level)
936 br->flags._BQC_use_index = 1;
937 }
938
939 if (!br->flags._BQC_use_index)
940 device->cap._BQC = device->cap._BCQ = 0;
941 }
942
943 return 0;
944}
945
946
1da177e4 947/*
21fcb34e
FC		 948 * Arg:
949 * device : video output device (LCD, CRT, ..)
1da177e4
LT		 950 *
951 * Return Value:
469778c1
JJ		 952 * Maximum brightness level
953 *
954 * Allocate and initialize device->brightness.
955 */
956
957static int
958acpi_video_init_brightness(struct acpi_video_device *device)
959{
960 union acpi_object *obj = NULL;
d32f6947 961 int i, max_level = 0, count = 0, level_ac_battery = 0;
1a7c618a 962 unsigned long long level, level_old;
469778c1
JJ		 963 union acpi_object *o;
964 struct acpi_video_device_brightness *br = NULL;
1a7c618a 965 int result = -EINVAL;
bd8ba205 966 u32 value;
469778c1
JJ		 967
968 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
969 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
970 "LCD brightness level\n"));
971 goto out;
972 }
973
974 if (obj->package.count < 2)
975 goto out;
976
977 br = kzalloc(sizeof(*br), GFP_KERNEL);
978 if (!br) {
979 printk(KERN_ERR "can't allocate memory\n");
1a7c618a 980 result = -ENOMEM;
469778c1
JJ		 981 goto out;
982 }
983
d32f6947 984 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
469778c1 985 GFP_KERNEL);
1a7c618a
ZR		 986 if (!br->levels) {
987 result = -ENOMEM;
469778c1 988 goto out_free;
1a7c618a 989 }
469778c1
JJ		 990
991 for (i = 0; i < obj->package.count; i++) {
992 o = (union acpi_object *)&obj->package.elements[i];
993 if (o->type != ACPI_TYPE_INTEGER) {
994 printk(KERN_ERR PREFIX "Invalid data\n");
995 continue;
996 }
bd8ba205
HG		 997 value = (u32) o->integer.value;
998 /* Skip duplicate entries */
999 if (count > 2 && br->levels[count - 1] == value)
1000 continue;
1001
1002 br->levels[count] = value;
469778c1
JJ		 1003
1004 if (br->levels[count] > max_level)
1005 max_level = br->levels[count];
1006 count++;
1007 }
1008
d32f6947
ZR		 1009 /*
1010 * some buggy BIOS don't export the levels
1011 * when machine is on AC/Battery in _BCL package.
1012 * In this case, the first two elements in _BCL packages
1013 * are also supported brightness levels that OS should take care of.
1014 */
90af2cf6
ZR		 1015 for (i = 2; i < count; i++) {
1016 if (br->levels[i] == br->levels[0])
d32f6947 1017 level_ac_battery++;
90af2cf6
ZR		 1018 if (br->levels[i] == br->levels[1])
1019 level_ac_battery++;
1020 }
d32f6947
ZR		 1021
1022 if (level_ac_battery < 2) {
1023 level_ac_battery = 2 - level_ac_battery;
1024 br->flags._BCL_no_ac_battery_levels = 1;
1025 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
1026 br->levels[i] = br->levels[i - level_ac_battery];
1027 count += level_ac_battery;
1028 } else if (level_ac_battery > 2)
bf6787eb 1029 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
d32f6947 1030
d80fb99f
ZR		 1031 /* Check if the _BCL package is in a reversed order */
1032 if (max_level == br->levels[2]) {
1033 br->flags._BCL_reversed = 1;
1034 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
1035 acpi_video_cmp_level, NULL);
1036 } else if (max_level != br->levels[count - 1])
1037 ACPI_ERROR((AE_INFO,
bf6787eb 1038 "Found unordered _BCL package"));
469778c1
JJ		 1039
1040 br->count = count;
1041 device->brightness = br;
1a7c618a 1042
1a7c618a 1043 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
90c53ca4 1044 br->curr = level = max_level;
e047cca6
ZR		 1045
1046 if (!device->cap._BQC)
1047 goto set_level;
1048
a89803df
DB		 1049 result = acpi_video_device_lcd_get_level_current(device,
1050 &level_old, true);
1a7c618a
ZR		 1051 if (result)
1052 goto out_free_levels;
1053
a50188da 1054 result = acpi_video_bqc_quirk(device, max_level, level_old);
1a7c618a
ZR		 1055 if (result)
1056 goto out_free_levels;
a50188da
AL		 1057 /*
1058 * cap._BQC may get cleared due to _BQC is found to be broken
1059 * in acpi_video_bqc_quirk, so check again here.
1060 */
1061 if (!device->cap._BQC)
1062 goto set_level;
e047cca6 1063
545ef368
AL		 1064 level = acpi_video_bqc_value_to_level(device, level_old);
1065 /*
1066 * On some buggy laptops, _BQC returns an uninitialized
1067 * value when invoked for the first time, i.e.
1068 * level_old is invalid (no matter whether it's a level
1069 * or an index). Set the backlight to max_level in this case.
1070 */
1071 for (i = 2; i < br->count; i++)
1072 if (level == br->levels[i])
1073 break;
1074 if (i == br->count || !level)
1075 level = max_level;
e047cca6 1076
e047cca6 1077set_level:
90c53ca4 1078 result = acpi_video_device_lcd_set_level(device, level);
e047cca6
ZR		 1079 if (result)
1080 goto out_free_levels;
1a7c618a 1081
d32f6947
ZR		 1082 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1083 "found %d brightness levels\n", count - 2));
469778c1 1084 kfree(obj);
1a7c618a 1085 return result;
469778c1
JJ		 1086
1087out_free_levels:
1088 kfree(br->levels);
1089out_free:
1090 kfree(br);
1091out:
1092 device->brightness = NULL;
1093 kfree(obj);
1a7c618a 1094 return result;
469778c1
JJ		 1095}
1096
1097/*
1098 * Arg:
1099 * device : video output device (LCD, CRT, ..)
1100 *
1101 * Return Value:
21fcb34e 1102 * None
1da177e4 1103 *
98fb8fe1 1104 * Find out all required AML methods defined under the output
1da177e4
LT		 1105 * device.
1106 */
1107
4be44fcd 1108static void acpi_video_device_find_cap(struct acpi_video_device *device)
1da177e4 1109{
952c63e9 1110 if (acpi_has_method(device->dev->handle, "_ADR"))
1da177e4 1111 device->cap._ADR = 1;
952c63e9 1112 if (acpi_has_method(device->dev->handle, "_BCL"))
4be44fcd 1113 device->cap._BCL = 1;
952c63e9 1114 if (acpi_has_method(device->dev->handle, "_BCM"))
4be44fcd 1115 device->cap._BCM = 1;
952c63e9 1116 if (acpi_has_method(device->dev->handle, "_BQC")) {
2f3d000a 1117 device->cap._BQC = 1;
952c63e9 1118 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
c60d638e
ZR		 1119 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
1120 device->cap._BCQ = 1;
1121 }
1122
952c63e9 1123 if (acpi_has_method(device->dev->handle, "_DDC"))
4be44fcd 1124 device->cap._DDC = 1;
1da177e4
LT		 1125}
1126
1127/*
21fcb34e
FC		 1128 * Arg:
1129 * device : video output device (VGA)
1da177e4
LT		 1130 *
1131 * Return Value:
21fcb34e 1132 * None
1da177e4 1133 *
98fb8fe1 1134 * Find out all required AML methods defined under the video bus device.
1da177e4
LT		 1135 */
1136
4be44fcd 1137static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1da177e4 1138{
952c63e9 1139 if (acpi_has_method(video->device->handle, "_DOS"))
1da177e4 1140 video->cap._DOS = 1;
952c63e9 1141 if (acpi_has_method(video->device->handle, "_DOD"))
1da177e4 1142 video->cap._DOD = 1;
952c63e9 1143 if (acpi_has_method(video->device->handle, "_ROM"))
1da177e4 1144 video->cap._ROM = 1;
952c63e9 1145 if (acpi_has_method(video->device->handle, "_GPD"))
1da177e4 1146 video->cap._GPD = 1;
952c63e9 1147 if (acpi_has_method(video->device->handle, "_SPD"))
1da177e4 1148 video->cap._SPD = 1;
952c63e9 1149 if (acpi_has_method(video->device->handle, "_VPO"))
1da177e4 1150 video->cap._VPO = 1;
1da177e4
LT		 1151}
1152
1153/*
1154 * Check whether the video bus device has required AML method to
1155 * support the desired features
1156 */
1157
4be44fcd 1158static int acpi_video_bus_check(struct acpi_video_bus *video)
1da177e4 1159{
4be44fcd 1160 acpi_status status = -ENOENT;
1e4cffe7 1161 struct pci_dev *dev;
1da177e4
LT		 1162
1163 if (!video)
d550d98d 1164 return -EINVAL;
1da177e4 1165
1e4cffe7 1166 dev = acpi_get_pci_dev(video->device->handle);
22c13f9d
TR		 1167 if (!dev)
1168 return -ENODEV;
1e4cffe7 1169 pci_dev_put(dev);
22c13f9d 1170
21fcb34e
FC		 1171 /*
1172 * Since there is no HID, CID and so on for VGA driver, we have
1da177e4
LT		 1173 * to check well known required nodes.
1174 */
1175
98fb8fe1 1176 /* Does this device support video switching? */
3a1151e3
SB		 1177 if (video->cap._DOS || video->cap._DOD) {
1178 if (!video->cap._DOS) {
1179 printk(KERN_WARNING FW_BUG
1180 "ACPI(%s) defines _DOD but not _DOS\n",
1181 acpi_device_bid(video->device));
1182 }
1da177e4
LT		 1183 video->flags.multihead = 1;
1184 status = 0;
1185 }
1186
98fb8fe1 1187 /* Does this device support retrieving a video ROM? */
4be44fcd 1188 if (video->cap._ROM) {
1da177e4
LT		 1189 video->flags.rom = 1;
1190 status = 0;
1191 }
1192
98fb8fe1 1193 /* Does this device support configuring which video device to POST? */
4be44fcd 1194 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1da177e4
LT		 1195 video->flags.post = 1;
1196 status = 0;
1197 }
1198
d550d98d 1199 return status;
1da177e4
LT		 1200}
1201
21fcb34e
FC		 1202/*
1203 * --------------------------------------------------------------------------
1204 * Driver Interface
1205 * --------------------------------------------------------------------------
1206 */
1da177e4
LT		 1207
1208/* device interface */
915ea7e4 1209static struct acpi_video_device_attrib *
82cae999
RZ		 1210acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1211{
78eed028
DT		 1212 struct acpi_video_enumerated_device *ids;
1213 int i;
1214
1215 for (i = 0; i < video->attached_count; i++) {
1216 ids = &video->attached_array[i];
1217 if ((ids->value.int_val & 0xffff) == device_id)
1218 return &ids->value.attrib;
1219 }
82cae999 1220
82cae999
RZ		 1221 return NULL;
1222}
1da177e4 1223
e92a7162
MG		 1224static int
1225acpi_video_get_device_type(struct acpi_video_bus *video,
1226 unsigned long device_id)
1227{
1228 struct acpi_video_enumerated_device *ids;
1229 int i;
1230
1231 for (i = 0; i < video->attached_count; i++) {
1232 ids = &video->attached_array[i];
1233 if ((ids->value.int_val & 0xffff) == device_id)
1234 return ids->value.int_val;
1235 }
1236
1237 return 0;
1238}
1239
1da177e4 1240static int
4be44fcd
LB		 1241acpi_video_bus_get_one_device(struct acpi_device *device,
1242 struct acpi_video_bus *video)
1da177e4 1243{
27663c58 1244 unsigned long long device_id;
e92a7162 1245 int status, device_type;
4be44fcd 1246 struct acpi_video_device *data;
915ea7e4 1247 struct acpi_video_device_attrib *attribute;
1da177e4 1248
4be44fcd
LB		 1249 status =
1250 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
91e13aa3
AL		 1251 /* Some device omits _ADR, we skip them instead of fail */
1252 if (ACPI_FAILURE(status))
1253 return 0;
1da177e4 1254
91e13aa3
AL		 1255 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1256 if (!data)
1257 return -ENOMEM;
82cae999 1258
91e13aa3
AL		 1259 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1260 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1261 device->driver_data = data;
1262
1263 data->device_id = device_id;
1264 data->video = video;
1265 data->dev = device;
8ab58e8e
LT		 1266 INIT_DELAYED_WORK(&data->switch_brightness_work,
1267 acpi_video_switch_brightness);
91e13aa3
AL		 1268
1269 attribute = acpi_video_get_device_attr(video, device_id);
1270
915ea7e4 1271 if (attribute && attribute->device_id_scheme) {
91e13aa3
AL		 1272 switch (attribute->display_type) {
1273 case ACPI_VIDEO_DISPLAY_CRT:
1274 data->flags.crt = 1;
1275 break;
1276 case ACPI_VIDEO_DISPLAY_TV:
1277 data->flags.tvout = 1;
1278 break;
1279 case ACPI_VIDEO_DISPLAY_DVI:
1280 data->flags.dvi = 1;
1281 break;
1282 case ACPI_VIDEO_DISPLAY_LCD:
1283 data->flags.lcd = 1;
1284 break;
1285 default:
1286 data->flags.unknown = 1;
1287 break;
1288 }
915ea7e4 1289 if (attribute->bios_can_detect)
91e13aa3
AL		 1290 data->flags.bios = 1;
1291 } else {
1292 /* Check for legacy IDs */
1293 device_type = acpi_video_get_device_type(video, device_id);
1294 /* Ignore bits 16 and 18-20 */
1295 switch (device_type & 0xffe2ffff) {
915ea7e4
FC		 1296 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1297 data->flags.crt = 1;
1298 break;
1299 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1300 data->flags.lcd = 1;
1301 break;
1302 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1303 data->flags.tvout = 1;
1304 break;
1305 default:
1306 data->flags.unknown = 1;
e92a7162 1307 }
91e13aa3 1308 }
4be44fcd 1309
91e13aa3
AL		 1310 acpi_video_device_bind(video, data);
1311 acpi_video_device_find_cap(data);
1da177e4 1312
91e13aa3
AL		 1313 mutex_lock(&video->device_list_lock);
1314 list_add_tail(&data->entry, &video->video_device_list);
1315 mutex_unlock(&video->device_list_lock);
1da177e4 1316
91e13aa3 1317 return status;
1da177e4
LT		 1318}
1319
1320/*
1321 * Arg:
21fcb34e 1322 * video : video bus device
1da177e4
LT		 1323 *
1324 * Return:
21fcb34e
FC		 1325 * none
1326 *
1327 * Enumerate the video device list of the video bus,
1da177e4
LT		 1328 * bind the ids with the corresponding video devices
1329 * under the video bus.
4be44fcd 1330 */
1da177e4 1331
4be44fcd 1332static void acpi_video_device_rebind(struct acpi_video_bus *video)
1da177e4 1333{
ff102ea9
DT		 1334 struct acpi_video_device *dev;
1335
bbac81f5 1336 mutex_lock(&video->device_list_lock);
ff102ea9
DT		 1337
1338 list_for_each_entry(dev, &video->video_device_list, entry)
4be44fcd 1339 acpi_video_device_bind(video, dev);
ff102ea9 1340
bbac81f5 1341 mutex_unlock(&video->device_list_lock);
1da177e4
LT		 1342}
1343
1344/*
1345 * Arg:
21fcb34e
FC		 1346 * video : video bus device
1347 * device : video output device under the video
1348 * bus
1da177e4
LT		 1349 *
1350 * Return:
21fcb34e
FC		 1351 * none
1352 *
1da177e4
LT		 1353 * Bind the ids with the corresponding video devices
1354 * under the video bus.
4be44fcd 1355 */
1da177e4
LT		 1356
1357static void
4be44fcd
LB		 1358acpi_video_device_bind(struct acpi_video_bus *video,
1359 struct acpi_video_device *device)
1da177e4 1360{
78eed028 1361 struct acpi_video_enumerated_device *ids;
4be44fcd 1362 int i;
1da177e4 1363
78eed028
DT		 1364 for (i = 0; i < video->attached_count; i++) {
1365 ids = &video->attached_array[i];
1366 if (device->device_id == (ids->value.int_val & 0xffff)) {
1367 ids->bind_info = device;
1da177e4
LT		 1368 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1369 }
1370 }
1da177e4
LT		 1371}
1372
1373/*
1374 * Arg:
21fcb34e 1375 * video : video bus device
1da177e4
LT		 1376 *
1377 * Return:
21fcb34e
FC		 1378 * < 0 : error
1379 *
1da177e4
LT		 1380 * Call _DOD to enumerate all devices attached to display adapter
1381 *
4be44fcd 1382 */
1da177e4
LT		 1383
1384static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1385{
4be44fcd
LB		 1386 int status;
1387 int count;
1388 int i;
78eed028 1389 struct acpi_video_enumerated_device *active_list;
4be44fcd
LB		 1390 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1391 union acpi_object *dod = NULL;
1392 union acpi_object *obj;
1da177e4 1393
90130268 1394 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1da177e4 1395 if (!ACPI_SUCCESS(status)) {
a6fc6720 1396 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
d550d98d 1397 return status;
1da177e4
LT		 1398 }
1399
50dd0969 1400 dod = buffer.pointer;
1da177e4 1401 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
a6fc6720 1402 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1da177e4
LT		 1403 status = -EFAULT;
1404 goto out;
1405 }
1406
1407 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
4be44fcd 1408 dod->package.count));
1da177e4 1409
78eed028
DT		 1410 active_list = kcalloc(1 + dod->package.count,
1411 sizeof(struct acpi_video_enumerated_device),
1412 GFP_KERNEL);
1413 if (!active_list) {
1da177e4
LT		 1414 status = -ENOMEM;
1415 goto out;
1416 }
1417
1418 count = 0;
1419 for (i = 0; i < dod->package.count; i++) {
50dd0969 1420 obj = &dod->package.elements[i];
1da177e4
LT		 1421
1422 if (obj->type != ACPI_TYPE_INTEGER) {
78eed028
DT		 1423 printk(KERN_ERR PREFIX
1424 "Invalid _DOD data in element %d\n", i);
1425 continue;
1da177e4 1426 }
78eed028
DT		 1427
1428 active_list[count].value.int_val = obj->integer.value;
1429 active_list[count].bind_info = NULL;
4be44fcd
LB		 1430 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1431 (int)obj->integer.value));
1da177e4
LT		 1432 count++;
1433 }
1da177e4 1434
6044ec88 1435 kfree(video->attached_array);
4be44fcd 1436
78eed028 1437 video->attached_array = active_list;
1da177e4 1438 video->attached_count = count;
78eed028 1439
915ea7e4 1440out:
02438d87 1441 kfree(buffer.pointer);
d550d98d 1442 return status;
1da177e4
LT		 1443}
1444
4be44fcd
LB		 1445static int
1446acpi_video_get_next_level(struct acpi_video_device *device,
1447 u32 level_current, u32 event)
1da177e4 1448{
63f0edfc 1449 int min, max, min_above, max_below, i, l, delta = 255;
f4715189
TT		 1450 max = max_below = 0;
1451 min = min_above = 255;
63f0edfc 1452 /* Find closest level to level_current */
0a3db1ce 1453 for (i = 2; i < device->brightness->count; i++) {
63f0edfc
AS		 1454 l = device->brightness->levels[i];
1455 if (abs(l - level_current) < abs(delta)) {
1456 delta = l - level_current;
1457 if (!delta)
1458 break;
1459 }
1460 }
1461 /* Ajust level_current to closest available level */
1462 level_current += delta;
0a3db1ce 1463 for (i = 2; i < device->brightness->count; i++) {
f4715189
TT		 1464 l = device->brightness->levels[i];
1465 if (l < min)
1466 min = l;
1467 if (l > max)
1468 max = l;
1469 if (l < min_above && l > level_current)
1470 min_above = l;
1471 if (l > max_below && l < level_current)
1472 max_below = l;
1473 }
1474
1475 switch (event) {
1476 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1477 return (level_current < max) ? min_above : min;
1478 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1479 return (level_current < max) ? min_above : max;
1480 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1481 return (level_current > min) ? max_below : min;
1482 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1483 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1484 return 0;
1485 default:
1486 return level_current;
1487 }
1da177e4
LT		 1488}
1489
8ab58e8e
LT		 1490static void
1491acpi_video_switch_brightness(struct work_struct *work)
1da177e4 1492{
8ab58e8e
LT		 1493 struct acpi_video_device *device = container_of(to_delayed_work(work),
1494 struct acpi_video_device, switch_brightness_work);
27663c58 1495 unsigned long long level_current, level_next;
8ab58e8e 1496 int event = device->switch_brightness_event;
c8890f90
ZR		 1497 int result = -EINVAL;
1498
fbc9fe1b
AL		 1499 /* no warning message if acpi_backlight=vendor or a quirk is used */
1500 if (!acpi_video_verify_backlight_support())
8ab58e8e 1501 return;
28c32e99 1502
469778c1 1503 if (!device->brightness)
c8890f90
ZR		 1504 goto out;
1505
1506 result = acpi_video_device_lcd_get_level_current(device,
a89803df
DB		 1507 &level_current,
1508 false);
c8890f90
ZR		 1509 if (result)
1510 goto out;
1511
1da177e4 1512 level_next = acpi_video_get_next_level(device, level_current, event);
c8890f90 1513
24450c7a 1514 result = acpi_video_device_lcd_set_level(device, level_next);
c8890f90 1515
36342742
MG		 1516 if (!result)
1517 backlight_force_update(device->backlight,
1518 BACKLIGHT_UPDATE_HOTKEY);
1519
c8890f90
ZR		 1520out:
1521 if (result)
1522 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1da177e4
LT		 1523}
1524
e92a7162
MG		 1525int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1526 void **edid)
1527{
1528 struct acpi_video_bus *video;
1529 struct acpi_video_device *video_device;
1530 union acpi_object *buffer = NULL;
1531 acpi_status status;
1532 int i, length;
1533
1534 if (!device || !acpi_driver_data(device))
1535 return -EINVAL;
1536
1537 video = acpi_driver_data(device);
1538
1539 for (i = 0; i < video->attached_count; i++) {
1540 video_device = video->attached_array[i].bind_info;
1541 length = 256;
1542
1543 if (!video_device)
1544 continue;
1545
82069552
ZR		 1546 if (!video_device->cap._DDC)
1547 continue;
1548
e92a7162
MG		 1549 if (type) {
1550 switch (type) {
1551 case ACPI_VIDEO_DISPLAY_CRT:
1552 if (!video_device->flags.crt)
1553 continue;
1554 break;
1555 case ACPI_VIDEO_DISPLAY_TV:
1556 if (!video_device->flags.tvout)
1557 continue;
1558 break;
1559 case ACPI_VIDEO_DISPLAY_DVI:
1560 if (!video_device->flags.dvi)
1561 continue;
1562 break;
1563 case ACPI_VIDEO_DISPLAY_LCD:
1564 if (!video_device->flags.lcd)
1565 continue;
1566 break;
1567 }
1568 } else if (video_device->device_id != device_id) {
1569 continue;
1570 }
1571
1572 status = acpi_video_device_EDID(video_device, &buffer, length);
1573
1574 if (ACPI_FAILURE(status) || !buffer ||
1575 buffer->type != ACPI_TYPE_BUFFER) {
1576 length = 128;
1577 status = acpi_video_device_EDID(video_device, &buffer,
1578 length);
1579 if (ACPI_FAILURE(status) || !buffer ||
1580 buffer->type != ACPI_TYPE_BUFFER) {
1581 continue;
1582 }
1583 }
1584
1585 *edid = buffer->buffer.pointer;
1586 return length;
1587 }
1588
1589 return -ENODEV;
1590}
1591EXPORT_SYMBOL(acpi_video_get_edid);
1592
1da177e4 1593static int
4be44fcd
LB		 1594acpi_video_bus_get_devices(struct acpi_video_bus *video,
1595 struct acpi_device *device)
1da177e4 1596{
fba4e087 1597 int status = 0;
ff102ea9 1598 struct acpi_device *dev;
1da177e4 1599
fba4e087
IM		 1600 /*
1601 * There are systems where video module known to work fine regardless
1602 * of broken _DOD and ignoring returned value here doesn't cause
1603 * any issues later.
1604 */
1605 acpi_video_device_enumerate(video);
1da177e4 1606
ff102ea9 1607 list_for_each_entry(dev, &device->children, node) {
1da177e4
LT		 1608
1609 status = acpi_video_bus_get_one_device(dev, video);
ea9f8856 1610 if (status) {
91e13aa3
AL		 1611 dev_err(&dev->dev, "Can't attach device\n");
1612 break;
1da177e4 1613 }
1da177e4 1614 }
d550d98d 1615 return status;
1da177e4
LT		 1616}
1617
1da177e4
LT		 1618/* acpi_video interface */
1619
efaa14c7
AL		 1620/*
1621 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1622 * preform any automatic brightness change on receiving a notification.
1623 */
4be44fcd 1624static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1da177e4 1625{
efaa14c7 1626 return acpi_video_bus_DOS(video, 0,
fbc9fe1b 1627 acpi_osi_is_win8() ? 1 : 0);
1da177e4
LT		 1628}
1629
4be44fcd 1630static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1da177e4 1631{
efaa14c7 1632 return acpi_video_bus_DOS(video, 0,
fbc9fe1b 1633 acpi_osi_is_win8() ? 0 : 1);
1da177e4
LT		 1634}
1635
7015558f 1636static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1da177e4 1637{
7015558f 1638 struct acpi_video_bus *video = acpi_driver_data(device);
e9dab196 1639 struct input_dev *input;
17c452f9 1640 int keycode = 0;
e9dab196 1641
67b662e1 1642 if (!video || !video->input)
d550d98d 1643 return;
1da177e4 1644
e9dab196 1645 input = video->input;
1da177e4
LT		 1646
1647 switch (event) {
98fb8fe1 1648 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1da177e4 1649 * most likely via hotkey. */
8a37c65d 1650 keycode = KEY_SWITCHVIDEOMODE;
1da177e4
LT		 1651 break;
1652
98fb8fe1 1653 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1da177e4
LT		 1654 * connector. */
1655 acpi_video_device_enumerate(video);
1656 acpi_video_device_rebind(video);
e9dab196 1657 keycode = KEY_SWITCHVIDEOMODE;
1da177e4
LT		 1658 break;
1659
4be44fcd 1660 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
e9dab196
LY		 1661 keycode = KEY_SWITCHVIDEOMODE;
1662 break;
4be44fcd 1663 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
e9dab196
LY		 1664 keycode = KEY_VIDEO_NEXT;
1665 break;
4be44fcd 1666 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
e9dab196 1667 keycode = KEY_VIDEO_PREV;
1da177e4
LT		 1668 break;
1669
1670 default:
1671 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
4be44fcd 1672 "Unsupported event [0x%x]\n", event));
1da177e4
LT		 1673 break;
1674 }
1675
8a37c65d
LT		 1676 if (acpi_notifier_call_chain(device, event, 0))
1677 /* Something vetoed the keypress. */
1678 keycode = 0;
17c452f9
MG		 1679
1680 if (keycode) {
1681 input_report_key(input, keycode, 1);
1682 input_sync(input);
1683 input_report_key(input, keycode, 0);
1684 input_sync(input);
1685 }
e9dab196 1686
d550d98d 1687 return;
1da177e4
LT		 1688}
1689
8ab58e8e
LT		 1690static void brightness_switch_event(struct acpi_video_device *video_device,
1691 u32 event)
1692{
1693 if (!brightness_switch_enabled)
1694 return;
1695
1696 video_device->switch_brightness_event = event;
1697 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10);
1698}
1699
4be44fcd 1700static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1da177e4 1701{
50dd0969 1702 struct acpi_video_device *video_device = data;
4be44fcd 1703 struct acpi_device *device = NULL;
e9dab196
LY		 1704 struct acpi_video_bus *bus;
1705 struct input_dev *input;
17c452f9 1706 int keycode = 0;
1da177e4 1707
1da177e4 1708 if (!video_device)
d550d98d 1709 return;
1da177e4 1710
e6afa0de 1711 device = video_device->dev;
e9dab196
LY		 1712 bus = video_device->video;
1713 input = bus->input;
1da177e4
LT		 1714
1715 switch (event) {
4be44fcd 1716 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
8ab58e8e 1717 brightness_switch_event(video_device, event);
e9dab196
LY		 1718 keycode = KEY_BRIGHTNESS_CYCLE;
1719 break;
4be44fcd 1720 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
8ab58e8e 1721 brightness_switch_event(video_device, event);
e9dab196
LY		 1722 keycode = KEY_BRIGHTNESSUP;
1723 break;
4be44fcd 1724 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
8ab58e8e 1725 brightness_switch_event(video_device, event);
e9dab196
LY		 1726 keycode = KEY_BRIGHTNESSDOWN;
1727 break;
70f23fd6 1728 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
8ab58e8e 1729 brightness_switch_event(video_device, event);
e9dab196
LY		 1730 keycode = KEY_BRIGHTNESS_ZERO;
1731 break;
4be44fcd 1732 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
8ab58e8e 1733 brightness_switch_event(video_device, event);
e9dab196 1734 keycode = KEY_DISPLAY_OFF;
1da177e4
LT		 1735 break;
1736 default:
1737 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
4be44fcd 1738 "Unsupported event [0x%x]\n", event));
1da177e4
LT		 1739 break;
1740 }
e9dab196 1741
7761f638 1742 acpi_notifier_call_chain(device, event, 0);
17c452f9
MG		 1743
1744 if (keycode) {
1745 input_report_key(input, keycode, 1);
1746 input_sync(input);
1747 input_report_key(input, keycode, 0);
1748 input_sync(input);
1749 }
e9dab196 1750
d550d98d 1751 return;
1da177e4
LT		 1752}
1753
ac7729da
RW		 1754static int acpi_video_resume(struct notifier_block *nb,
1755 unsigned long val, void *ign)
863c1490
MG		 1756{
1757 struct acpi_video_bus *video;
1758 struct acpi_video_device *video_device;
1759 int i;
1760
ac7729da
RW		 1761 switch (val) {
1762 case PM_HIBERNATION_PREPARE:
1763 case PM_SUSPEND_PREPARE:
1764 case PM_RESTORE_PREPARE:
1765 return NOTIFY_DONE;
1766 }
863c1490 1767
ac7729da
RW		 1768 video = container_of(nb, struct acpi_video_bus, pm_nb);
1769
1770 dev_info(&video->device->dev, "Restoring backlight state\n");
863c1490
MG		 1771
1772 for (i = 0; i < video->attached_count; i++) {
1773 video_device = video->attached_array[i].bind_info;
1774 if (video_device && video_device->backlight)
1775 acpi_video_set_brightness(video_device->backlight);
1776 }
ac7729da
RW		 1777
1778 return NOTIFY_OK;
863c1490
MG		 1779}
1780
c504f8cb
ZR		 1781static acpi_status
1782acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1783 void **return_value)
1784{
1785 struct acpi_device *device = context;
1786 struct acpi_device *sibling;
1787 int result;
1788
1789 if (handle == device->handle)
1790 return AE_CTRL_TERMINATE;
1791
1792 result = acpi_bus_get_device(handle, &sibling);
1793 if (result)
1794 return AE_OK;
1795
1796 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1797 return AE_ALREADY_EXISTS;
1798
1799 return AE_OK;
1800}
1801
67b662e1
AL		 1802static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1803{
99678ed7
HG		 1804 struct backlight_properties props;
1805 struct pci_dev *pdev;
1806 acpi_handle acpi_parent;
1807 struct device *parent = NULL;
1808 int result;
1809 static int count;
1810 char *name;
67b662e1 1811
99678ed7
HG		 1812 result = acpi_video_init_brightness(device);
1813 if (result)
1814 return;
1815 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1816 if (!name)
1817 return;
1818 count++;
67b662e1 1819
99678ed7 1820 acpi_get_parent(device->dev->handle, &acpi_parent);
67b662e1 1821
99678ed7
HG		 1822 pdev = acpi_get_pci_dev(acpi_parent);
1823 if (pdev) {
1824 parent = &pdev->dev;
1825 pci_dev_put(pdev);
1826 }
67b662e1 1827
99678ed7
HG		 1828 memset(&props, 0, sizeof(struct backlight_properties));
1829 props.type = BACKLIGHT_FIRMWARE;
1830 props.max_brightness = device->brightness->count - 3;
1831 device->backlight = backlight_device_register(name,
1832 parent,
1833 device,
1834 &acpi_backlight_ops,
1835 &props);
1836 kfree(name);
1837 if (IS_ERR(device->backlight))
1838 return;
67b662e1 1839
99678ed7
HG		 1840 /*
1841 * Save current brightness level in case we have to restore it
1842 * before acpi_video_device_lcd_set_level() is called next time.
1843 */
1844 device->backlight->props.brightness =
1845 acpi_video_get_brightness(device->backlight);
67b662e1 1846
99678ed7
HG		 1847 device->cooling_dev = thermal_cooling_device_register("LCD",
1848 device->dev, &video_cooling_ops);
1849 if (IS_ERR(device->cooling_dev)) {
1850 /*
1851 * Set cooling_dev to NULL so we don't crash trying to free it.
1852 * Also, why the hell we are returning early and not attempt to
1853 * register video output if cooling device registration failed?
1854 * -- dtor
1855 */
1856 device->cooling_dev = NULL;
1857 return;
67b662e1 1858 }
99678ed7
HG		 1859
1860 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1861 device->cooling_dev->id);
1862 result = sysfs_create_link(&device->dev->dev.kobj,
1863 &device->cooling_dev->device.kobj,
1864 "thermal_cooling");
1865 if (result)
1866 printk(KERN_ERR PREFIX "Create sysfs link\n");
1867 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1868 &device->dev->dev.kobj, "device");
1869 if (result)
1870 printk(KERN_ERR PREFIX "Create sysfs link\n");
67b662e1
AL		 1871}
1872
1873static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1874{
1875 struct acpi_video_device *dev;
1876
53a92ba7
HG		 1877 if (video->backlight_registered)
1878 return 0;
1879
99678ed7
HG		 1880 if (!acpi_video_verify_backlight_support())
1881 return 0;
1882
67b662e1
AL		 1883 mutex_lock(&video->device_list_lock);
1884 list_for_each_entry(dev, &video->video_device_list, entry)
1885 acpi_video_dev_register_backlight(dev);
1886 mutex_unlock(&video->device_list_lock);
1887
99678ed7
HG		 1888 video->backlight_registered = true;
1889
67b662e1
AL		 1890 video->pm_nb.notifier_call = acpi_video_resume;
1891 video->pm_nb.priority = 0;
1892 return register_pm_notifier(&video->pm_nb);
1893}
1894
1895static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1896{
1897 if (device->backlight) {
1898 backlight_device_unregister(device->backlight);
1899 device->backlight = NULL;
1900 }
1901 if (device->brightness) {
1902 kfree(device->brightness->levels);
1903 kfree(device->brightness);
1904 device->brightness = NULL;
1905 }
1906 if (device->cooling_dev) {
1907 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1908 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1909 thermal_cooling_device_unregister(device->cooling_dev);
1910 device->cooling_dev = NULL;
1911 }
1912}
1913
1914static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1915{
1916 struct acpi_video_device *dev;
99678ed7
HG		 1917 int error;
1918
1919 if (!video->backlight_registered)
1920 return 0;
1921
1922 error = unregister_pm_notifier(&video->pm_nb);
67b662e1
AL		 1923
1924 mutex_lock(&video->device_list_lock);
1925 list_for_each_entry(dev, &video->video_device_list, entry)
1926 acpi_video_dev_unregister_backlight(dev);
1927 mutex_unlock(&video->device_list_lock);
1928
99678ed7
HG		 1929 video->backlight_registered = false;
1930
67b662e1
AL		 1931 return error;
1932}
1933
1934static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1935{
1936 acpi_status status;
1937 struct acpi_device *adev = device->dev;
1938
1939 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1940 acpi_video_device_notify, device);
1941 if (ACPI_FAILURE(status))
1942 dev_err(&adev->dev, "Error installing notify handler\n");
1943 else
1944 device->flags.notify = 1;
1945}
1946
1947static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1948{
1949 struct input_dev *input;
1950 struct acpi_video_device *dev;
1951 int error;
1952
1953 video->input = input = input_allocate_device();
1954 if (!input) {
1955 error = -ENOMEM;
1956 goto out;
1957 }
1958
1959 error = acpi_video_bus_start_devices(video);
1960 if (error)
1961 goto err_free_input;
1962
1963 snprintf(video->phys, sizeof(video->phys),
1964 "%s/video/input0", acpi_device_hid(video->device));
1965
1966 input->name = acpi_device_name(video->device);
1967 input->phys = video->phys;
1968 input->id.bustype = BUS_HOST;
1969 input->id.product = 0x06;
1970 input->dev.parent = &video->device->dev;
1971 input->evbit[0] = BIT(EV_KEY);
1972 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1973 set_bit(KEY_VIDEO_NEXT, input->keybit);
1974 set_bit(KEY_VIDEO_PREV, input->keybit);
1975 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1976 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1977 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1978 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1979 set_bit(KEY_DISPLAY_OFF, input->keybit);
1980
1981 error = input_register_device(input);
1982 if (error)
1983 goto err_stop_dev;
1984
1985 mutex_lock(&video->device_list_lock);
1986 list_for_each_entry(dev, &video->video_device_list, entry)
1987 acpi_video_dev_add_notify_handler(dev);
1988 mutex_unlock(&video->device_list_lock);
1989
1990 return 0;
1991
1992err_stop_dev:
1993 acpi_video_bus_stop_devices(video);
1994err_free_input:
1995 input_free_device(input);
1996 video->input = NULL;
1997out:
1998 return error;
1999}
2000
2001static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
2002{
2003 if (dev->flags.notify) {
2004 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
2005 acpi_video_device_notify);
2006 dev->flags.notify = 0;
2007 }
2008}
2009
2010static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
2011{
2012 struct acpi_video_device *dev;
2013
2014 mutex_lock(&video->device_list_lock);
2015 list_for_each_entry(dev, &video->video_device_list, entry)
2016 acpi_video_dev_remove_notify_handler(dev);
2017 mutex_unlock(&video->device_list_lock);
2018
2019 acpi_video_bus_stop_devices(video);
2020 input_unregister_device(video->input);
2021 video->input = NULL;
2022}
2023
53a92ba7
HG		 2024static int acpi_video_backlight_notify(struct notifier_block *nb,
2025 unsigned long val, void *bd)
2026{
2027 struct backlight_device *backlight = bd;
2028 struct acpi_video_bus *video;
2029
2030 /* acpi_video_verify_backlight_support only cares about raw devices */
2031 if (backlight->props.type != BACKLIGHT_RAW)
2032 return NOTIFY_DONE;
2033
2034 video = container_of(nb, struct acpi_video_bus, backlight_nb);
2035
2036 switch (val) {
2037 case BACKLIGHT_REGISTERED:
2038 if (!acpi_video_verify_backlight_support())
2039 acpi_video_bus_unregister_backlight(video);
2040 break;
2041 case BACKLIGHT_UNREGISTERED:
2042 acpi_video_bus_register_backlight(video);
2043 break;
2044 }
2045
2046 return NOTIFY_OK;
2047}
2048
2049static int acpi_video_bus_add_backlight_notify_handler(
2050 struct acpi_video_bus *video)
2051{
2052 int error;
2053
2054 video->backlight_nb.notifier_call = acpi_video_backlight_notify;
2055 video->backlight_nb.priority = 0;
2056 error = backlight_register_notifier(&video->backlight_nb);
2057 if (error == 0)
2058 video->backlight_notifier_registered = true;
2059
2060 return error;
2061}
2062
2063static int acpi_video_bus_remove_backlight_notify_handler(
2064 struct acpi_video_bus *video)
2065{
2066 if (!video->backlight_notifier_registered)
2067 return 0;
2068
2069 video->backlight_notifier_registered = false;
2070
2071 return backlight_unregister_notifier(&video->backlight_nb);
2072}
2073
67b662e1
AL		 2074static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
2075{
2076 struct acpi_video_device *dev, *next;
2077
2078 mutex_lock(&video->device_list_lock);
2079 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
2080 list_del(&dev->entry);
2081 kfree(dev);
2082 }
2083 mutex_unlock(&video->device_list_lock);
2084
2085 return 0;
2086}
2087
ac7729da
RW		 2088static int instance;
2089
4be44fcd 2090static int acpi_video_bus_add(struct acpi_device *device)
1da177e4 2091{
f51e8391 2092 struct acpi_video_bus *video;
f51e8391 2093 int error;
c504f8cb
ZR		 2094 acpi_status status;
2095
2096 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
2097 device->parent->handle, 1,
2098 acpi_video_bus_match, NULL,
2099 device, NULL);
2100 if (status == AE_ALREADY_EXISTS) {
2101 printk(KERN_WARNING FW_BUG
2102 "Duplicate ACPI video bus devices for the"
2103 " same VGA controller, please try module "
2104 "parameter \"video.allow_duplicates=1\""
2105 "if the current driver doesn't work.\n");
2106 if (!allow_duplicates)
2107 return -ENODEV;
2108 }
1da177e4 2109
36bcbec7 2110 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1da177e4 2111 if (!video)
d550d98d 2112 return -ENOMEM;
1da177e4 2113
e6d9da1d
ZR		 2114 /* a hack to fix the duplicate name "VID" problem on T61 */
2115 if (!strcmp(device->pnp.bus_id, "VID")) {
2116 if (instance)
2117 device->pnp.bus_id[3] = '0' + instance;
915ea7e4 2118 instance++;
e6d9da1d 2119 }
f3b39f13
ZY		 2120 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2121 if (!strcmp(device->pnp.bus_id, "VGA")) {
2122 if (instance)
2123 device->pnp.bus_id[3] = '0' + instance;
2124 instance++;
2125 }
e6d9da1d 2126
e6afa0de 2127 video->device = device;
1da177e4
LT		 2128 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2129 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
db89b4f0 2130 device->driver_data = video;
1da177e4
LT		 2131
2132 acpi_video_bus_find_cap(video);
f51e8391
DT		 2133 error = acpi_video_bus_check(video);
2134 if (error)
2135 goto err_free_video;
1da177e4 2136
bbac81f5 2137 mutex_init(&video->device_list_lock);
1da177e4
LT		 2138 INIT_LIST_HEAD(&video->video_device_list);
2139
ea9f8856
IM		 2140 error = acpi_video_bus_get_devices(video, device);
2141 if (error)
91e13aa3 2142 goto err_put_video;
1da177e4 2143
1da177e4 2144 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
4be44fcd
LB		 2145 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2146 video->flags.multihead ? "yes" : "no",
2147 video->flags.rom ? "yes" : "no",
2148 video->flags.post ? "yes" : "no");
67b662e1
AL		 2149 mutex_lock(&video_list_lock);
2150 list_add_tail(&video->entry, &video_bus_head);
2151 mutex_unlock(&video_list_lock);
1da177e4 2152
67b662e1
AL		 2153 acpi_video_bus_register_backlight(video);
2154 acpi_video_bus_add_notify_handler(video);
53a92ba7 2155 acpi_video_bus_add_backlight_notify_handler(video);
ac7729da 2156
f51e8391
DT		 2157 return 0;
2158
67b662e1 2159err_put_video:
f51e8391
DT		 2160 acpi_video_bus_put_devices(video);
2161 kfree(video->attached_array);
67b662e1 2162err_free_video:
f51e8391 2163 kfree(video);
db89b4f0 2164 device->driver_data = NULL;
1da177e4 2165
f51e8391 2166 return error;
1da177e4
LT		 2167}
2168
51fac838 2169static int acpi_video_bus_remove(struct acpi_device *device)
1da177e4 2170{
4be44fcd 2171 struct acpi_video_bus *video = NULL;
1da177e4 2172
1da177e4
LT		 2173
2174 if (!device || !acpi_driver_data(device))
d550d98d 2175 return -EINVAL;
1da177e4 2176
50dd0969 2177 video = acpi_driver_data(device);
1da177e4 2178
53a92ba7 2179 acpi_video_bus_remove_backlight_notify_handler(video);
67b662e1
AL		 2180 acpi_video_bus_remove_notify_handler(video);
2181 acpi_video_bus_unregister_backlight(video);
1da177e4 2182 acpi_video_bus_put_devices(video);
1da177e4 2183
67b662e1
AL		 2184 mutex_lock(&video_list_lock);
2185 list_del(&video->entry);
2186 mutex_unlock(&video_list_lock);
2187
6044ec88 2188 kfree(video->attached_array);
1da177e4
LT		 2189 kfree(video);
2190
d550d98d 2191 return 0;
1da177e4
LT		 2192}
2193
c6996bdd
AC		 2194static int __init is_i740(struct pci_dev *dev)
2195{
2196 if (dev->device == 0x00D1)
2197 return 1;
2198 if (dev->device == 0x7000)
2199 return 1;
2200 return 0;
2201}
2202
74a365b3
MG		 2203static int __init intel_opregion_present(void)
2204{
c6996bdd 2205 int opregion = 0;
74a365b3
MG		 2206 struct pci_dev *dev = NULL;
2207 u32 address;
2208
2209 for_each_pci_dev(dev) {
2210 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2211 continue;
2212 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2213 continue;
c6996bdd
AC		 2214 /* We don't want to poke around undefined i740 registers */
2215 if (is_i740(dev))
2216 continue;
74a365b3
MG		 2217 pci_read_config_dword(dev, 0xfc, &address);
2218 if (!address)
2219 continue;
c6996bdd 2220 opregion = 1;
74a365b3 2221 }
c6996bdd 2222 return opregion;
74a365b3
MG		 2223}
2224
8e5c2b77 2225int acpi_video_register(void)
1da177e4 2226{
8e5c2b77 2227 int result = 0;
86e437f0
ZY		 2228 if (register_count) {
2229 /*
8e5c2b77
RW		 2230 * if the function of acpi_video_register is already called,
2231 * don't register the acpi_vide_bus again and return no error.
86e437f0
ZY		 2232 */
2233 return 0;
2234 }
1da177e4 2235
67b662e1
AL		 2236 mutex_init(&video_list_lock);
2237 INIT_LIST_HEAD(&video_bus_head);
2238
1da177e4 2239 result = acpi_bus_register_driver(&acpi_video_bus);
39fe394d 2240 if (result < 0)
d550d98d 2241 return -ENODEV;
1da177e4 2242
86e437f0
ZY		 2243 /*
2244 * When the acpi_video_bus is loaded successfully, increase
2245 * the counter reference.
2246 */
2247 register_count = 1;
2248
d550d98d 2249 return 0;
1da177e4 2250}
8e5c2b77 2251EXPORT_SYMBOL(acpi_video_register);
74a365b3 2252
86e437f0
ZY		 2253void acpi_video_unregister(void)
2254{
2255 if (!register_count) {
2256 /*
2257 * If the acpi video bus is already unloaded, don't
2258 * unload it again and return directly.
2259 */
2260 return;
2261 }
2262 acpi_bus_unregister_driver(&acpi_video_bus);
2263
86e437f0
ZY		 2264 register_count = 0;
2265
2266 return;
2267}
2268EXPORT_SYMBOL(acpi_video_unregister);
2269
1b7f37e1
HG		 2270void acpi_video_unregister_backlight(void)
2271{
2272 struct acpi_video_bus *video;
2273
2274 if (!register_count)
2275 return;
2276
2277 mutex_lock(&video_list_lock);
2278 list_for_each_entry(video, &video_bus_head, entry)
2279 acpi_video_bus_unregister_backlight(video);
2280 mutex_unlock(&video_list_lock);
2281}
2282EXPORT_SYMBOL(acpi_video_unregister_backlight);
2283
74a365b3
MG		 2284/*
2285 * This is kind of nasty. Hardware using Intel chipsets may require
2286 * the video opregion code to be run first in order to initialise
2287 * state before any ACPI video calls are made. To handle this we defer
2288 * registration of the video class until the opregion code has run.
2289 */
2290
2291static int __init acpi_video_init(void)
2292{
45cb50e6
ZR		 2293 dmi_check_system(video_dmi_table);
2294
74a365b3
MG		 2295 if (intel_opregion_present())
2296 return 0;
2297
2298 return acpi_video_register();
2299}
1da177e4 2300
86e437f0 2301static void __exit acpi_video_exit(void)
1da177e4 2302{
86e437f0 2303 acpi_video_unregister();
1da177e4 2304
d550d98d 2305 return;
1da177e4
LT		 2306}
2307
2308module_init(acpi_video_init);
2309module_exit(acpi_video_exit);
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