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ACPI / video: Disable native_backlight on HP ENVY 15 Notebook PC
[linux-2.6-block.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
5f24079b
HG		 420static int __init video_disable_native_backlight(const struct dmi_system_id *d)
421{
422 use_native_backlight_dmi = false;
423 return 0;
424}
425
45cb50e6
ZR		 426static struct dmi_system_id video_dmi_table[] __initdata = {
427 /*
428 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
429 */
430 {
431 .callback = video_set_bqc_offset,
432 .ident = "Acer Aspire 5720",
433 .matches = {
434 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
435 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
436 },
437 },
5afc4abe
LB		 438 {
439 .callback = video_set_bqc_offset,
440 .ident = "Acer Aspire 5710Z",
441 .matches = {
442 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
443 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
444 },
445 },
34ac272b
ZR		 446 {
447 .callback = video_set_bqc_offset,
448 .ident = "eMachines E510",
449 .matches = {
450 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
451 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
452 },
453 },
93bcece2
ZR		 454 {
455 .callback = video_set_bqc_offset,
456 .ident = "Acer Aspire 5315",
457 .matches = {
458 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
459 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
460 },
461 },
152a4e63
ZR		 462 {
463 .callback = video_set_bqc_offset,
464 .ident = "Acer Aspire 7720",
465 .matches = {
466 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
467 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
468 },
469 },
6d6b20b2
HG		 470 {
471 .callback = video_set_use_native_backlight,
472 .ident = "ThinkPad X230",
473 .matches = {
474 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
475 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X230"),
476 },
477 },
0e9f81d3
AL		 478 {
479 .callback = video_set_use_native_backlight,
43d94902 480 .ident = "ThinkPad T430 and T430s",
0e9f81d3
AL		 481 .matches = {
482 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
43d94902 483 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T430"),
0e9f81d3
AL		 484 },
485 },
486 {
487 .callback = video_set_use_native_backlight,
6d6b20b2 488 .ident = "ThinkPad T430",
0e9f81d3
AL		 489 .matches = {
490 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
6d6b20b2
HG		 491 DMI_MATCH(DMI_PRODUCT_VERSION, "2349D15"),
492 },
493 },
494 {
495 .callback = video_set_use_native_backlight,
496 .ident = "ThinkPad T431s",
497 .matches = {
498 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
499 DMI_MATCH(DMI_PRODUCT_VERSION, "20AACTO1WW"),
500 },
501 },
502 {
503 .callback = video_set_use_native_backlight,
504 .ident = "ThinkPad Edge E530",
505 .matches = {
506 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
507 DMI_MATCH(DMI_PRODUCT_VERSION, "3259A2G"),
508 },
509 },
510 {
511 .callback = video_set_use_native_backlight,
512 .ident = "ThinkPad Edge E530",
513 .matches = {
514 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
515 DMI_MATCH(DMI_PRODUCT_VERSION, "3259CTO"),
516 },
517 },
518 {
519 .callback = video_set_use_native_backlight,
520 .ident = "ThinkPad Edge E530",
521 .matches = {
522 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
523 DMI_MATCH(DMI_PRODUCT_VERSION, "3259HJG"),
0e9f81d3
AL		 524 },
525 },
1e815db6
HG		 526 {
527 .callback = video_set_use_native_backlight,
528 .ident = "ThinkPad W530",
529 .matches = {
530 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
531 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad W530"),
532 },
533 },
43d94902
HG		 534 {
535 .callback = video_set_use_native_backlight,
0e9f81d3
AL		 536 .ident = "ThinkPad X1 Carbon",
537 .matches = {
538 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
539 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X1 Carbon"),
540 },
541 },
542 {
543 .callback = video_set_use_native_backlight,
544 .ident = "Lenovo Yoga 13",
545 .matches = {
546 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
547 DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo IdeaPad Yoga 13"),
548 },
549 },
0dc6b96a
HG		 550 {
551 .callback = video_set_use_native_backlight,
552 .ident = "Lenovo Yoga 2 11",
553 .matches = {
554 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
555 DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo Yoga 2 11"),
556 },
557 },
997dd7fe
SCP		 558 {
559 .callback = video_set_use_native_backlight,
560 .ident = "Thinkpad Helix",
561 .matches = {
562 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
563 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad Helix"),
564 },
565 },
0e9f81d3
AL		 566 {
567 .callback = video_set_use_native_backlight,
568 .ident = "Dell Inspiron 7520",
569 .matches = {
570 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
5ff365fb 571 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7520"),
0e9f81d3
AL		 572 },
573 },
574 {
575 .callback = video_set_use_native_backlight,
576 .ident = "Acer Aspire 5733Z",
577 .matches = {
578 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
579 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5733Z"),
580 },
581 },
43d94902
HG		 582 {
583 .callback = video_set_use_native_backlight,
584 .ident = "Acer Aspire 5742G",
585 .matches = {
586 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
587 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5742G"),
588 },
589 },
0dc6b96a
HG		 590 {
591 .callback = video_set_use_native_backlight,
592 .ident = "Acer Aspire V5-171",
593 .matches = {
594 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
595 DMI_MATCH(DMI_PRODUCT_NAME, "V5-171"),
596 },
597 },
0e9f81d3
AL		 598 {
599 .callback = video_set_use_native_backlight,
600 .ident = "Acer Aspire V5-431",
601 .matches = {
602 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
603 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-431"),
604 },
605 },
0dc6b96a
HG		 606 {
607 .callback = video_set_use_native_backlight,
608 .ident = "Acer Aspire V5-471G",
609 .matches = {
610 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
611 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-471G"),
612 },
613 },
ab7027de
MK		 614 {
615 .callback = video_set_use_native_backlight,
616 .ident = "Acer TravelMate B113",
617 .matches = {
618 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
619 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate B113"),
620 },
621 },
6d6b20b2
HG		 622 {
623 .callback = video_set_use_native_backlight,
624 .ident = "Acer Aspire V5-572G",
625 .matches = {
626 DMI_MATCH(DMI_SYS_VENDOR, "Acer Aspire"),
627 DMI_MATCH(DMI_PRODUCT_VERSION, "V5-572G/Dazzle_CX"),
628 },
629 },
630 {
631 .callback = video_set_use_native_backlight,
632 .ident = "Acer Aspire V5-573G",
633 .matches = {
634 DMI_MATCH(DMI_SYS_VENDOR, "Acer Aspire"),
635 DMI_MATCH(DMI_PRODUCT_VERSION, "V5-573G/Dazzle_HW"),
636 },
637 },
638 {
639 .callback = video_set_use_native_backlight,
640 .ident = "ASUS Zenbook Prime UX31A",
641 .matches = {
642 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
643 DMI_MATCH(DMI_PRODUCT_NAME, "UX31A"),
644 },
645 },
0e9f81d3
AL		 646 {
647 .callback = video_set_use_native_backlight,
648 .ident = "HP ProBook 4340s",
649 .matches = {
650 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
651 DMI_MATCH(DMI_PRODUCT_VERSION, "HP ProBook 4340s"),
652 },
653 },
654 {
655 .callback = video_set_use_native_backlight,
4cf465b5
HG		 656 .ident = "HP ProBook 4540s",
657 .matches = {
658 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
659 DMI_MATCH(DMI_PRODUCT_VERSION, "HP ProBook 4540s"),
660 },
661 },
662 {
663 .callback = video_set_use_native_backlight,
0e9f81d3
AL		 664 .ident = "HP ProBook 2013 models",
665 .matches = {
666 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
667 DMI_MATCH(DMI_PRODUCT_NAME, "HP ProBook "),
668 DMI_MATCH(DMI_PRODUCT_NAME, " G1"),
669 },
670 },
671 {
672 .callback = video_set_use_native_backlight,
673 .ident = "HP EliteBook 2013 models",
674 .matches = {
675 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
676 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook "),
677 DMI_MATCH(DMI_PRODUCT_NAME, " G1"),
678 },
679 },
680 {
681 .callback = video_set_use_native_backlight,
7f94fde6
HG		 682 .ident = "HP EliteBook 2014 models",
683 .matches = {
684 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
685 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook "),
686 DMI_MATCH(DMI_PRODUCT_NAME, " G2"),
687 },
688 },
689 {
690 .callback = video_set_use_native_backlight,
0e9f81d3
AL		 691 .ident = "HP ZBook 14",
692 .matches = {
693 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
694 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 14"),
695 },
696 },
697 {
698 .callback = video_set_use_native_backlight,
699 .ident = "HP ZBook 15",
700 .matches = {
701 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
702 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 15"),
703 },
704 },
705 {
706 .callback = video_set_use_native_backlight,
707 .ident = "HP ZBook 17",
708 .matches = {
709 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
710 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 17"),
711 },
712 },
713 {
714 .callback = video_set_use_native_backlight,
0dc6b96a
HG		 715 .ident = "HP EliteBook 8470p",
716 .matches = {
717 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
718 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8470p"),
719 },
720 },
721 {
722 .callback = video_set_use_native_backlight,
0e9f81d3
AL		 723 .ident = "HP EliteBook 8780w",
724 .matches = {
725 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
726 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8780w"),
727 },
728 },
5f24079b
HG		 729
730 /*
731 * These models have a working acpi_video backlight control, and using
732 * native backlight causes a regression where backlight does not work
733 * when userspace is not handling brightness key events. Disable
734 * native_backlight on these to fix this:
735 * https://bugzilla.kernel.org/show_bug.cgi?id=81691
736 */
737 {
738 .callback = video_disable_native_backlight,
739 .ident = "ThinkPad T420",
740 .matches = {
741 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
742 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
743 },
744 },
745 {
746 .callback = video_disable_native_backlight,
747 .ident = "ThinkPad T520",
748 .matches = {
749 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
750 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
751 },
752 },
84c34858
HG		 753
754 /* The native backlight controls do not work on some older machines */
755 {
756 /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
757 .callback = video_disable_native_backlight,
758 .ident = "HP ENVY 15 Notebook",
759 .matches = {
760 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
761 DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
762 },
763 },
45cb50e6
ZR		 764 {}
765};
766
994fa63c
DB		 767static unsigned long long
768acpi_video_bqc_value_to_level(struct acpi_video_device *device,
769 unsigned long long bqc_value)
770{
771 unsigned long long level;
772
773 if (device->brightness->flags._BQC_use_index) {
774 /*
775 * _BQC returns an index that doesn't account for
776 * the first 2 items with special meaning, so we need
777 * to compensate for that by offsetting ourselves
778 */
779 if (device->brightness->flags._BCL_reversed)
780 bqc_value = device->brightness->count - 3 - bqc_value;
781
782 level = device->brightness->levels[bqc_value + 2];
783 } else {
784 level = bqc_value;
785 }
786
787 level += bqc_offset_aml_bug_workaround;
788
789 return level;
790}
791
1da177e4 792static int
4be44fcd 793acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
a89803df 794 unsigned long long *level, bool raw)
1da177e4 795{
c8890f90 796 acpi_status status = AE_OK;
4e231fa4 797 int i;
c8890f90 798
c60d638e
ZR		 799 if (device->cap._BQC || device->cap._BCQ) {
800 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
801
802 status = acpi_evaluate_integer(device->dev->handle, buf,
c8890f90
ZR		 803 NULL, level);
804 if (ACPI_SUCCESS(status)) {
a89803df
DB		 805 if (raw) {
806 /*
807 * Caller has indicated he wants the raw
808 * value returned by _BQC, so don't furtherly
809 * mess with the value.
810 */
811 return 0;
812 }
813
994fa63c 814 *level = acpi_video_bqc_value_to_level(device, *level);
1a7c618a 815
4e231fa4
VS		 816 for (i = 2; i < device->brightness->count; i++)
817 if (device->brightness->levels[i] == *level) {
818 device->brightness->curr = *level;
819 return 0;
915ea7e4 820 }
a89803df
DB		 821 /*
822 * BQC returned an invalid level.
823 * Stop using it.
824 */
825 ACPI_WARNING((AE_INFO,
826 "%s returned an invalid level",
827 buf));
828 device->cap._BQC = device->cap._BCQ = 0;
c8890f90 829 } else {
21fcb34e
FC		 830 /*
831 * Fixme:
c8890f90
ZR		 832 * should we return an error or ignore this failure?
833 * dev->brightness->curr is a cached value which stores
834 * the correct current backlight level in most cases.
835 * ACPI video backlight still works w/ buggy _BQC.
836 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
837 */
c60d638e
ZR		 838 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
839 device->cap._BQC = device->cap._BCQ = 0;
c8890f90
ZR		 840 }
841 }
842
4500ca8e 843 *level = device->brightness->curr;
c8890f90 844 return 0;
1da177e4
LT		 845}
846
847static int
4be44fcd
LB		 848acpi_video_device_EDID(struct acpi_video_device *device,
849 union acpi_object **edid, ssize_t length)
1da177e4 850{
4be44fcd
LB		 851 int status;
852 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
853 union acpi_object *obj;
854 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
855 struct acpi_object_list args = { 1, &arg0 };
1da177e4 856
1da177e4
LT		 857
858 *edid = NULL;
859
860 if (!device)
d550d98d 861 return -ENODEV;
1da177e4
LT		 862 if (length == 128)
863 arg0.integer.value = 1;
864 else if (length == 256)
865 arg0.integer.value = 2;
866 else
d550d98d 867 return -EINVAL;
1da177e4 868
90130268 869 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
1da177e4 870 if (ACPI_FAILURE(status))
d550d98d 871 return -ENODEV;
1da177e4 872
50dd0969 873 obj = buffer.pointer;
1da177e4
LT		 874
875 if (obj && obj->type == ACPI_TYPE_BUFFER)
876 *edid = obj;
877 else {
6468463a 878 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
1da177e4
LT		 879 status = -EFAULT;
880 kfree(obj);
881 }
882
d550d98d 883 return status;
1da177e4
LT		 884}
885
1da177e4
LT		 886/* bus */
887
1da177e4
LT		 888/*
889 * Arg:
21fcb34e
FC		 890 * video : video bus device pointer
891 * bios_flag :
1da177e4
LT		 892 * 0. The system BIOS should NOT automatically switch(toggle)
893 * the active display output.
894 * 1. The system BIOS should automatically switch (toggle) the
98fb8fe1 895 * active display output. No switch event.
1da177e4
LT		 896 * 2. The _DGS value should be locked.
897 * 3. The system BIOS should not automatically switch (toggle) the
898 * active display output, but instead generate the display switch
899 * event notify code.
900 * lcd_flag :
901 * 0. The system BIOS should automatically control the brightness level
98fb8fe1 902 * of the LCD when the power changes from AC to DC
21fcb34e 903 * 1. The system BIOS should NOT automatically control the brightness
98fb8fe1 904 * level of the LCD when the power changes from AC to DC.
21fcb34e 905 * Return Value:
ea9f8856 906 * -EINVAL wrong arg.
1da177e4
LT		 907 */
908
909static int
4be44fcd 910acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
1da177e4 911{
ea9f8856 912 acpi_status status;
1da177e4 913
b0373843
ZR		 914 if (!video->cap._DOS)
915 return 0;
1da177e4 916
ea9f8856
IM		 917 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
918 return -EINVAL;
0db98202
JL		 919 video->dos_setting = (lcd_flag << 2) | bios_flag;
920 status = acpi_execute_simple_method(video->device->handle, "_DOS",
921 (lcd_flag << 2) | bios_flag);
ea9f8856
IM		 922 if (ACPI_FAILURE(status))
923 return -EIO;
1da177e4 924
ea9f8856 925 return 0;
1da177e4
LT		 926}
927
935e5f29
ZR		 928/*
929 * Simple comparison function used to sort backlight levels.
930 */
931
932static int
933acpi_video_cmp_level(const void *a, const void *b)
934{
935 return *(int *)a - *(int *)b;
936}
937
a50188da
AL		 938/*
939 * Decides if _BQC/_BCQ for this system is usable
940 *
941 * We do this by changing the level first and then read out the current
942 * brightness level, if the value does not match, find out if it is using
943 * index. If not, clear the _BQC/_BCQ capability.
944 */
945static int acpi_video_bqc_quirk(struct acpi_video_device *device,
946 int max_level, int current_level)
947{
948 struct acpi_video_device_brightness *br = device->brightness;
949 int result;
950 unsigned long long level;
951 int test_level;
952
953 /* don't mess with existing known broken systems */
954 if (bqc_offset_aml_bug_workaround)
955 return 0;
956
957 /*
958 * Some systems always report current brightness level as maximum
959 * through _BQC, we need to test another value for them.
960 */
b3b301c5 961 test_level = current_level == max_level ? br->levels[3] : max_level;
a50188da
AL		 962
963 result = acpi_video_device_lcd_set_level(device, test_level);
964 if (result)
965 return result;
966
967 result = acpi_video_device_lcd_get_level_current(device, &level, true);
968 if (result)
969 return result;
970
971 if (level != test_level) {
972 /* buggy _BQC found, need to find out if it uses index */
973 if (level < br->count) {
974 if (br->flags._BCL_reversed)
975 level = br->count - 3 - level;
976 if (br->levels[level + 2] == test_level)
977 br->flags._BQC_use_index = 1;
978 }
979
980 if (!br->flags._BQC_use_index)
981 device->cap._BQC = device->cap._BCQ = 0;
982 }
983
984 return 0;
985}
986
987
1da177e4 988/*
21fcb34e
FC		 989 * Arg:
990 * device : video output device (LCD, CRT, ..)
1da177e4
LT		 991 *
992 * Return Value:
469778c1
JJ		 993 * Maximum brightness level
994 *
995 * Allocate and initialize device->brightness.
996 */
997
998static int
999acpi_video_init_brightness(struct acpi_video_device *device)
1000{
1001 union acpi_object *obj = NULL;
d32f6947 1002 int i, max_level = 0, count = 0, level_ac_battery = 0;
1a7c618a 1003 unsigned long long level, level_old;
469778c1
JJ		 1004 union acpi_object *o;
1005 struct acpi_video_device_brightness *br = NULL;
1a7c618a 1006 int result = -EINVAL;
bd8ba205 1007 u32 value;
469778c1
JJ		 1008
1009 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
1010 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
1011 "LCD brightness level\n"));
1012 goto out;
1013 }
1014
1015 if (obj->package.count < 2)
1016 goto out;
1017
1018 br = kzalloc(sizeof(*br), GFP_KERNEL);
1019 if (!br) {
1020 printk(KERN_ERR "can't allocate memory\n");
1a7c618a 1021 result = -ENOMEM;
469778c1
JJ		 1022 goto out;
1023 }
1024
d32f6947 1025 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
469778c1 1026 GFP_KERNEL);
1a7c618a
ZR		 1027 if (!br->levels) {
1028 result = -ENOMEM;
469778c1 1029 goto out_free;
1a7c618a 1030 }
469778c1
JJ		 1031
1032 for (i = 0; i < obj->package.count; i++) {
1033 o = (union acpi_object *)&obj->package.elements[i];
1034 if (o->type != ACPI_TYPE_INTEGER) {
1035 printk(KERN_ERR PREFIX "Invalid data\n");
1036 continue;
1037 }
bd8ba205
HG		 1038 value = (u32) o->integer.value;
1039 /* Skip duplicate entries */
1040 if (count > 2 && br->levels[count - 1] == value)
1041 continue;
1042
1043 br->levels[count] = value;
469778c1
JJ		 1044
1045 if (br->levels[count] > max_level)
1046 max_level = br->levels[count];
1047 count++;
1048 }
1049
d32f6947
ZR		 1050 /*
1051 * some buggy BIOS don't export the levels
1052 * when machine is on AC/Battery in _BCL package.
1053 * In this case, the first two elements in _BCL packages
1054 * are also supported brightness levels that OS should take care of.
1055 */
90af2cf6
ZR		 1056 for (i = 2; i < count; i++) {
1057 if (br->levels[i] == br->levels[0])
d32f6947 1058 level_ac_battery++;
90af2cf6
ZR		 1059 if (br->levels[i] == br->levels[1])
1060 level_ac_battery++;
1061 }
d32f6947
ZR		 1062
1063 if (level_ac_battery < 2) {
1064 level_ac_battery = 2 - level_ac_battery;
1065 br->flags._BCL_no_ac_battery_levels = 1;
1066 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
1067 br->levels[i] = br->levels[i - level_ac_battery];
1068 count += level_ac_battery;
1069 } else if (level_ac_battery > 2)
bf6787eb 1070 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
d32f6947 1071
d80fb99f
ZR		 1072 /* Check if the _BCL package is in a reversed order */
1073 if (max_level == br->levels[2]) {
1074 br->flags._BCL_reversed = 1;
1075 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
1076 acpi_video_cmp_level, NULL);
1077 } else if (max_level != br->levels[count - 1])
1078 ACPI_ERROR((AE_INFO,
bf6787eb 1079 "Found unordered _BCL package"));
469778c1
JJ		 1080
1081 br->count = count;
1082 device->brightness = br;
1a7c618a 1083
1a7c618a 1084 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
90c53ca4 1085 br->curr = level = max_level;
e047cca6
ZR		 1086
1087 if (!device->cap._BQC)
1088 goto set_level;
1089
a89803df
DB		 1090 result = acpi_video_device_lcd_get_level_current(device,
1091 &level_old, true);
1a7c618a
ZR		 1092 if (result)
1093 goto out_free_levels;
1094
a50188da 1095 result = acpi_video_bqc_quirk(device, max_level, level_old);
1a7c618a
ZR		 1096 if (result)
1097 goto out_free_levels;
a50188da
AL		 1098 /*
1099 * cap._BQC may get cleared due to _BQC is found to be broken
1100 * in acpi_video_bqc_quirk, so check again here.
1101 */
1102 if (!device->cap._BQC)
1103 goto set_level;
e047cca6 1104
545ef368
AL		 1105 level = acpi_video_bqc_value_to_level(device, level_old);
1106 /*
1107 * On some buggy laptops, _BQC returns an uninitialized
1108 * value when invoked for the first time, i.e.
1109 * level_old is invalid (no matter whether it's a level
1110 * or an index). Set the backlight to max_level in this case.
1111 */
1112 for (i = 2; i < br->count; i++)
1113 if (level == br->levels[i])
1114 break;
1115 if (i == br->count || !level)
1116 level = max_level;
e047cca6 1117
e047cca6 1118set_level:
90c53ca4 1119 result = acpi_video_device_lcd_set_level(device, level);
e047cca6
ZR		 1120 if (result)
1121 goto out_free_levels;
1a7c618a 1122
d32f6947
ZR		 1123 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1124 "found %d brightness levels\n", count - 2));
469778c1 1125 kfree(obj);
1a7c618a 1126 return result;
469778c1
JJ		 1127
1128out_free_levels:
1129 kfree(br->levels);
1130out_free:
1131 kfree(br);
1132out:
1133 device->brightness = NULL;
1134 kfree(obj);
1a7c618a 1135 return result;
469778c1
JJ		 1136}
1137
1138/*
1139 * Arg:
1140 * device : video output device (LCD, CRT, ..)
1141 *
1142 * Return Value:
21fcb34e 1143 * None
1da177e4 1144 *
98fb8fe1 1145 * Find out all required AML methods defined under the output
1da177e4
LT		 1146 * device.
1147 */
1148
4be44fcd 1149static void acpi_video_device_find_cap(struct acpi_video_device *device)
1da177e4 1150{
952c63e9 1151 if (acpi_has_method(device->dev->handle, "_ADR"))
1da177e4 1152 device->cap._ADR = 1;
952c63e9 1153 if (acpi_has_method(device->dev->handle, "_BCL"))
4be44fcd 1154 device->cap._BCL = 1;
952c63e9 1155 if (acpi_has_method(device->dev->handle, "_BCM"))
4be44fcd 1156 device->cap._BCM = 1;
952c63e9 1157 if (acpi_has_method(device->dev->handle, "_BQC")) {
2f3d000a 1158 device->cap._BQC = 1;
952c63e9 1159 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
c60d638e
ZR		 1160 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
1161 device->cap._BCQ = 1;
1162 }
1163
952c63e9 1164 if (acpi_has_method(device->dev->handle, "_DDC"))
4be44fcd 1165 device->cap._DDC = 1;
1da177e4
LT		 1166}
1167
1168/*
21fcb34e
FC		 1169 * Arg:
1170 * device : video output device (VGA)
1da177e4
LT		 1171 *
1172 * Return Value:
21fcb34e 1173 * None
1da177e4 1174 *
98fb8fe1 1175 * Find out all required AML methods defined under the video bus device.
1da177e4
LT		 1176 */
1177
4be44fcd 1178static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1da177e4 1179{
952c63e9 1180 if (acpi_has_method(video->device->handle, "_DOS"))
1da177e4 1181 video->cap._DOS = 1;
952c63e9 1182 if (acpi_has_method(video->device->handle, "_DOD"))
1da177e4 1183 video->cap._DOD = 1;
952c63e9 1184 if (acpi_has_method(video->device->handle, "_ROM"))
1da177e4 1185 video->cap._ROM = 1;
952c63e9 1186 if (acpi_has_method(video->device->handle, "_GPD"))
1da177e4 1187 video->cap._GPD = 1;
952c63e9 1188 if (acpi_has_method(video->device->handle, "_SPD"))
1da177e4 1189 video->cap._SPD = 1;
952c63e9 1190 if (acpi_has_method(video->device->handle, "_VPO"))
1da177e4 1191 video->cap._VPO = 1;
1da177e4
LT		 1192}
1193
1194/*
1195 * Check whether the video bus device has required AML method to
1196 * support the desired features
1197 */
1198
4be44fcd 1199static int acpi_video_bus_check(struct acpi_video_bus *video)
1da177e4 1200{
4be44fcd 1201 acpi_status status = -ENOENT;
1e4cffe7 1202 struct pci_dev *dev;
1da177e4
LT		 1203
1204 if (!video)
d550d98d 1205 return -EINVAL;
1da177e4 1206
1e4cffe7 1207 dev = acpi_get_pci_dev(video->device->handle);
22c13f9d
TR		 1208 if (!dev)
1209 return -ENODEV;
1e4cffe7 1210 pci_dev_put(dev);
22c13f9d 1211
21fcb34e
FC		 1212 /*
1213 * Since there is no HID, CID and so on for VGA driver, we have
1da177e4
LT		 1214 * to check well known required nodes.
1215 */
1216
98fb8fe1 1217 /* Does this device support video switching? */
3a1151e3
SB		 1218 if (video->cap._DOS || video->cap._DOD) {
1219 if (!video->cap._DOS) {
1220 printk(KERN_WARNING FW_BUG
1221 "ACPI(%s) defines _DOD but not _DOS\n",
1222 acpi_device_bid(video->device));
1223 }
1da177e4
LT		 1224 video->flags.multihead = 1;
1225 status = 0;
1226 }
1227
98fb8fe1 1228 /* Does this device support retrieving a video ROM? */
4be44fcd 1229 if (video->cap._ROM) {
1da177e4
LT		 1230 video->flags.rom = 1;
1231 status = 0;
1232 }
1233
98fb8fe1 1234 /* Does this device support configuring which video device to POST? */
4be44fcd 1235 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1da177e4
LT		 1236 video->flags.post = 1;
1237 status = 0;
1238 }
1239
d550d98d 1240 return status;
1da177e4
LT		 1241}
1242
21fcb34e
FC		 1243/*
1244 * --------------------------------------------------------------------------
1245 * Driver Interface
1246 * --------------------------------------------------------------------------
1247 */
1da177e4
LT		 1248
1249/* device interface */
915ea7e4 1250static struct acpi_video_device_attrib *
82cae999
RZ		 1251acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1252{
78eed028
DT		 1253 struct acpi_video_enumerated_device *ids;
1254 int i;
1255
1256 for (i = 0; i < video->attached_count; i++) {
1257 ids = &video->attached_array[i];
1258 if ((ids->value.int_val & 0xffff) == device_id)
1259 return &ids->value.attrib;
1260 }
82cae999 1261
82cae999
RZ		 1262 return NULL;
1263}
1da177e4 1264
e92a7162
MG		 1265static int
1266acpi_video_get_device_type(struct acpi_video_bus *video,
1267 unsigned long device_id)
1268{
1269 struct acpi_video_enumerated_device *ids;
1270 int i;
1271
1272 for (i = 0; i < video->attached_count; i++) {
1273 ids = &video->attached_array[i];
1274 if ((ids->value.int_val & 0xffff) == device_id)
1275 return ids->value.int_val;
1276 }
1277
1278 return 0;
1279}
1280
1da177e4 1281static int
4be44fcd
LB		 1282acpi_video_bus_get_one_device(struct acpi_device *device,
1283 struct acpi_video_bus *video)
1da177e4 1284{
27663c58 1285 unsigned long long device_id;
e92a7162 1286 int status, device_type;
4be44fcd 1287 struct acpi_video_device *data;
915ea7e4 1288 struct acpi_video_device_attrib *attribute;
1da177e4 1289
4be44fcd
LB		 1290 status =
1291 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
91e13aa3
AL		 1292 /* Some device omits _ADR, we skip them instead of fail */
1293 if (ACPI_FAILURE(status))
1294 return 0;
1da177e4 1295
91e13aa3
AL		 1296 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1297 if (!data)
1298 return -ENOMEM;
82cae999 1299
91e13aa3
AL		 1300 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1301 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1302 device->driver_data = data;
1303
1304 data->device_id = device_id;
1305 data->video = video;
1306 data->dev = device;
8ab58e8e
LT		 1307 INIT_DELAYED_WORK(&data->switch_brightness_work,
1308 acpi_video_switch_brightness);
91e13aa3
AL		 1309
1310 attribute = acpi_video_get_device_attr(video, device_id);
1311
915ea7e4 1312 if (attribute && attribute->device_id_scheme) {
91e13aa3
AL		 1313 switch (attribute->display_type) {
1314 case ACPI_VIDEO_DISPLAY_CRT:
1315 data->flags.crt = 1;
1316 break;
1317 case ACPI_VIDEO_DISPLAY_TV:
1318 data->flags.tvout = 1;
1319 break;
1320 case ACPI_VIDEO_DISPLAY_DVI:
1321 data->flags.dvi = 1;
1322 break;
1323 case ACPI_VIDEO_DISPLAY_LCD:
1324 data->flags.lcd = 1;
1325 break;
1326 default:
1327 data->flags.unknown = 1;
1328 break;
1329 }
915ea7e4 1330 if (attribute->bios_can_detect)
91e13aa3
AL		 1331 data->flags.bios = 1;
1332 } else {
1333 /* Check for legacy IDs */
1334 device_type = acpi_video_get_device_type(video, device_id);
1335 /* Ignore bits 16 and 18-20 */
1336 switch (device_type & 0xffe2ffff) {
915ea7e4
FC		 1337 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1338 data->flags.crt = 1;
1339 break;
1340 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1341 data->flags.lcd = 1;
1342 break;
1343 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1344 data->flags.tvout = 1;
1345 break;
1346 default:
1347 data->flags.unknown = 1;
e92a7162 1348 }
91e13aa3 1349 }
4be44fcd 1350
91e13aa3
AL		 1351 acpi_video_device_bind(video, data);
1352 acpi_video_device_find_cap(data);
1da177e4 1353
91e13aa3
AL		 1354 mutex_lock(&video->device_list_lock);
1355 list_add_tail(&data->entry, &video->video_device_list);
1356 mutex_unlock(&video->device_list_lock);
1da177e4 1357
91e13aa3 1358 return status;
1da177e4
LT		 1359}
1360
1361/*
1362 * Arg:
21fcb34e 1363 * video : video bus device
1da177e4
LT		 1364 *
1365 * Return:
21fcb34e
FC		 1366 * none
1367 *
1368 * Enumerate the video device list of the video bus,
1da177e4
LT		 1369 * bind the ids with the corresponding video devices
1370 * under the video bus.
4be44fcd 1371 */
1da177e4 1372
4be44fcd 1373static void acpi_video_device_rebind(struct acpi_video_bus *video)
1da177e4 1374{
ff102ea9
DT		 1375 struct acpi_video_device *dev;
1376
bbac81f5 1377 mutex_lock(&video->device_list_lock);
ff102ea9
DT		 1378
1379 list_for_each_entry(dev, &video->video_device_list, entry)
4be44fcd 1380 acpi_video_device_bind(video, dev);
ff102ea9 1381
bbac81f5 1382 mutex_unlock(&video->device_list_lock);
1da177e4
LT		 1383}
1384
1385/*
1386 * Arg:
21fcb34e
FC		 1387 * video : video bus device
1388 * device : video output device under the video
1389 * bus
1da177e4
LT		 1390 *
1391 * Return:
21fcb34e
FC		 1392 * none
1393 *
1da177e4
LT		 1394 * Bind the ids with the corresponding video devices
1395 * under the video bus.
4be44fcd 1396 */
1da177e4
LT		 1397
1398static void
4be44fcd
LB		 1399acpi_video_device_bind(struct acpi_video_bus *video,
1400 struct acpi_video_device *device)
1da177e4 1401{
78eed028 1402 struct acpi_video_enumerated_device *ids;
4be44fcd 1403 int i;
1da177e4 1404
78eed028
DT		 1405 for (i = 0; i < video->attached_count; i++) {
1406 ids = &video->attached_array[i];
1407 if (device->device_id == (ids->value.int_val & 0xffff)) {
1408 ids->bind_info = device;
1da177e4
LT		 1409 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1410 }
1411 }
1da177e4
LT		 1412}
1413
1414/*
1415 * Arg:
21fcb34e 1416 * video : video bus device
1da177e4
LT		 1417 *
1418 * Return:
21fcb34e
FC		 1419 * < 0 : error
1420 *
1da177e4
LT		 1421 * Call _DOD to enumerate all devices attached to display adapter
1422 *
4be44fcd 1423 */
1da177e4
LT		 1424
1425static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1426{
4be44fcd
LB		 1427 int status;
1428 int count;
1429 int i;
78eed028 1430 struct acpi_video_enumerated_device *active_list;
4be44fcd
LB		 1431 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1432 union acpi_object *dod = NULL;
1433 union acpi_object *obj;
1da177e4 1434
90130268 1435 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1da177e4 1436 if (!ACPI_SUCCESS(status)) {
a6fc6720 1437 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
d550d98d 1438 return status;
1da177e4
LT		 1439 }
1440
50dd0969 1441 dod = buffer.pointer;
1da177e4 1442 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
a6fc6720 1443 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1da177e4
LT		 1444 status = -EFAULT;
1445 goto out;
1446 }
1447
1448 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
4be44fcd 1449 dod->package.count));
1da177e4 1450
78eed028
DT		 1451 active_list = kcalloc(1 + dod->package.count,
1452 sizeof(struct acpi_video_enumerated_device),
1453 GFP_KERNEL);
1454 if (!active_list) {
1da177e4
LT		 1455 status = -ENOMEM;
1456 goto out;
1457 }
1458
1459 count = 0;
1460 for (i = 0; i < dod->package.count; i++) {
50dd0969 1461 obj = &dod->package.elements[i];
1da177e4
LT		 1462
1463 if (obj->type != ACPI_TYPE_INTEGER) {
78eed028
DT		 1464 printk(KERN_ERR PREFIX
1465 "Invalid _DOD data in element %d\n", i);
1466 continue;
1da177e4 1467 }
78eed028
DT		 1468
1469 active_list[count].value.int_val = obj->integer.value;
1470 active_list[count].bind_info = NULL;
4be44fcd
LB		 1471 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1472 (int)obj->integer.value));
1da177e4
LT		 1473 count++;
1474 }
1da177e4 1475
6044ec88 1476 kfree(video->attached_array);
4be44fcd 1477
78eed028 1478 video->attached_array = active_list;
1da177e4 1479 video->attached_count = count;
78eed028 1480
915ea7e4 1481out:
02438d87 1482 kfree(buffer.pointer);
d550d98d 1483 return status;
1da177e4
LT		 1484}
1485
4be44fcd
LB		 1486static int
1487acpi_video_get_next_level(struct acpi_video_device *device,
1488 u32 level_current, u32 event)
1da177e4 1489{
63f0edfc 1490 int min, max, min_above, max_below, i, l, delta = 255;
f4715189
TT		 1491 max = max_below = 0;
1492 min = min_above = 255;
63f0edfc 1493 /* Find closest level to level_current */
0a3db1ce 1494 for (i = 2; i < device->brightness->count; i++) {
63f0edfc
AS		 1495 l = device->brightness->levels[i];
1496 if (abs(l - level_current) < abs(delta)) {
1497 delta = l - level_current;
1498 if (!delta)
1499 break;
1500 }
1501 }
1502 /* Ajust level_current to closest available level */
1503 level_current += delta;
0a3db1ce 1504 for (i = 2; i < device->brightness->count; i++) {
f4715189
TT		 1505 l = device->brightness->levels[i];
1506 if (l < min)
1507 min = l;
1508 if (l > max)
1509 max = l;
1510 if (l < min_above && l > level_current)
1511 min_above = l;
1512 if (l > max_below && l < level_current)
1513 max_below = l;
1514 }
1515
1516 switch (event) {
1517 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1518 return (level_current < max) ? min_above : min;
1519 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1520 return (level_current < max) ? min_above : max;
1521 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1522 return (level_current > min) ? max_below : min;
1523 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1524 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1525 return 0;
1526 default:
1527 return level_current;
1528 }
1da177e4
LT		 1529}
1530
8ab58e8e
LT		 1531static void
1532acpi_video_switch_brightness(struct work_struct *work)
1da177e4 1533{
8ab58e8e
LT		 1534 struct acpi_video_device *device = container_of(to_delayed_work(work),
1535 struct acpi_video_device, switch_brightness_work);
27663c58 1536 unsigned long long level_current, level_next;
8ab58e8e 1537 int event = device->switch_brightness_event;
c8890f90
ZR		 1538 int result = -EINVAL;
1539
fbc9fe1b
AL		 1540 /* no warning message if acpi_backlight=vendor or a quirk is used */
1541 if (!acpi_video_verify_backlight_support())
8ab58e8e 1542 return;
28c32e99 1543
469778c1 1544 if (!device->brightness)
c8890f90
ZR		 1545 goto out;
1546
1547 result = acpi_video_device_lcd_get_level_current(device,
a89803df
DB		 1548 &level_current,
1549 false);
c8890f90
ZR		 1550 if (result)
1551 goto out;
1552
1da177e4 1553 level_next = acpi_video_get_next_level(device, level_current, event);
c8890f90 1554
24450c7a 1555 result = acpi_video_device_lcd_set_level(device, level_next);
c8890f90 1556
36342742
MG		 1557 if (!result)
1558 backlight_force_update(device->backlight,
1559 BACKLIGHT_UPDATE_HOTKEY);
1560
c8890f90
ZR		 1561out:
1562 if (result)
1563 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1da177e4
LT		 1564}
1565
e92a7162
MG		 1566int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1567 void **edid)
1568{
1569 struct acpi_video_bus *video;
1570 struct acpi_video_device *video_device;
1571 union acpi_object *buffer = NULL;
1572 acpi_status status;
1573 int i, length;
1574
1575 if (!device || !acpi_driver_data(device))
1576 return -EINVAL;
1577
1578 video = acpi_driver_data(device);
1579
1580 for (i = 0; i < video->attached_count; i++) {
1581 video_device = video->attached_array[i].bind_info;
1582 length = 256;
1583
1584 if (!video_device)
1585 continue;
1586
82069552
ZR		 1587 if (!video_device->cap._DDC)
1588 continue;
1589
e92a7162
MG		 1590 if (type) {
1591 switch (type) {
1592 case ACPI_VIDEO_DISPLAY_CRT:
1593 if (!video_device->flags.crt)
1594 continue;
1595 break;
1596 case ACPI_VIDEO_DISPLAY_TV:
1597 if (!video_device->flags.tvout)
1598 continue;
1599 break;
1600 case ACPI_VIDEO_DISPLAY_DVI:
1601 if (!video_device->flags.dvi)
1602 continue;
1603 break;
1604 case ACPI_VIDEO_DISPLAY_LCD:
1605 if (!video_device->flags.lcd)
1606 continue;
1607 break;
1608 }
1609 } else if (video_device->device_id != device_id) {
1610 continue;
1611 }
1612
1613 status = acpi_video_device_EDID(video_device, &buffer, length);
1614
1615 if (ACPI_FAILURE(status) || !buffer ||
1616 buffer->type != ACPI_TYPE_BUFFER) {
1617 length = 128;
1618 status = acpi_video_device_EDID(video_device, &buffer,
1619 length);
1620 if (ACPI_FAILURE(status) || !buffer ||
1621 buffer->type != ACPI_TYPE_BUFFER) {
1622 continue;
1623 }
1624 }
1625
1626 *edid = buffer->buffer.pointer;
1627 return length;
1628 }
1629
1630 return -ENODEV;
1631}
1632EXPORT_SYMBOL(acpi_video_get_edid);
1633
1da177e4 1634static int
4be44fcd
LB		 1635acpi_video_bus_get_devices(struct acpi_video_bus *video,
1636 struct acpi_device *device)
1da177e4 1637{
fba4e087 1638 int status = 0;
ff102ea9 1639 struct acpi_device *dev;
1da177e4 1640
fba4e087
IM		 1641 /*
1642 * There are systems where video module known to work fine regardless
1643 * of broken _DOD and ignoring returned value here doesn't cause
1644 * any issues later.
1645 */
1646 acpi_video_device_enumerate(video);
1da177e4 1647
ff102ea9 1648 list_for_each_entry(dev, &device->children, node) {
1da177e4
LT		 1649
1650 status = acpi_video_bus_get_one_device(dev, video);
ea9f8856 1651 if (status) {
91e13aa3
AL		 1652 dev_err(&dev->dev, "Can't attach device\n");
1653 break;
1da177e4 1654 }
1da177e4 1655 }
d550d98d 1656 return status;
1da177e4
LT		 1657}
1658
1da177e4
LT		 1659/* acpi_video interface */
1660
efaa14c7
AL		 1661/*
1662 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1663 * preform any automatic brightness change on receiving a notification.
1664 */
4be44fcd 1665static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1da177e4 1666{
efaa14c7 1667 return acpi_video_bus_DOS(video, 0,
fbc9fe1b 1668 acpi_osi_is_win8() ? 1 : 0);
1da177e4
LT		 1669}
1670
4be44fcd 1671static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1da177e4 1672{
efaa14c7 1673 return acpi_video_bus_DOS(video, 0,
fbc9fe1b 1674 acpi_osi_is_win8() ? 0 : 1);
1da177e4
LT		 1675}
1676
7015558f 1677static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1da177e4 1678{
7015558f 1679 struct acpi_video_bus *video = acpi_driver_data(device);
e9dab196 1680 struct input_dev *input;
17c452f9 1681 int keycode = 0;
e9dab196 1682
67b662e1 1683 if (!video || !video->input)
d550d98d 1684 return;
1da177e4 1685
e9dab196 1686 input = video->input;
1da177e4
LT		 1687
1688 switch (event) {
98fb8fe1 1689 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1da177e4 1690 * most likely via hotkey. */
8a37c65d 1691 keycode = KEY_SWITCHVIDEOMODE;
1da177e4
LT		 1692 break;
1693
98fb8fe1 1694 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1da177e4
LT		 1695 * connector. */
1696 acpi_video_device_enumerate(video);
1697 acpi_video_device_rebind(video);
e9dab196 1698 keycode = KEY_SWITCHVIDEOMODE;
1da177e4
LT		 1699 break;
1700
4be44fcd 1701 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
e9dab196
LY		 1702 keycode = KEY_SWITCHVIDEOMODE;
1703 break;
4be44fcd 1704 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
e9dab196
LY		 1705 keycode = KEY_VIDEO_NEXT;
1706 break;
4be44fcd 1707 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
e9dab196 1708 keycode = KEY_VIDEO_PREV;
1da177e4
LT		 1709 break;
1710
1711 default:
1712 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
4be44fcd 1713 "Unsupported event [0x%x]\n", event));
1da177e4
LT		 1714 break;
1715 }
1716
8a37c65d
LT		 1717 if (acpi_notifier_call_chain(device, event, 0))
1718 /* Something vetoed the keypress. */
1719 keycode = 0;
17c452f9
MG		 1720
1721 if (keycode) {
1722 input_report_key(input, keycode, 1);
1723 input_sync(input);
1724 input_report_key(input, keycode, 0);
1725 input_sync(input);
1726 }
e9dab196 1727
d550d98d 1728 return;
1da177e4
LT		 1729}
1730
8ab58e8e
LT		 1731static void brightness_switch_event(struct acpi_video_device *video_device,
1732 u32 event)
1733{
1734 if (!brightness_switch_enabled)
1735 return;
1736
1737 video_device->switch_brightness_event = event;
1738 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10);
1739}
1740
4be44fcd 1741static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1da177e4 1742{
50dd0969 1743 struct acpi_video_device *video_device = data;
4be44fcd 1744 struct acpi_device *device = NULL;
e9dab196
LY		 1745 struct acpi_video_bus *bus;
1746 struct input_dev *input;
17c452f9 1747 int keycode = 0;
1da177e4 1748
1da177e4 1749 if (!video_device)
d550d98d 1750 return;
1da177e4 1751
e6afa0de 1752 device = video_device->dev;
e9dab196
LY		 1753 bus = video_device->video;
1754 input = bus->input;
1da177e4
LT		 1755
1756 switch (event) {
4be44fcd 1757 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
8ab58e8e 1758 brightness_switch_event(video_device, event);
e9dab196
LY		 1759 keycode = KEY_BRIGHTNESS_CYCLE;
1760 break;
4be44fcd 1761 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
8ab58e8e 1762 brightness_switch_event(video_device, event);
e9dab196
LY		 1763 keycode = KEY_BRIGHTNESSUP;
1764 break;
4be44fcd 1765 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
8ab58e8e 1766 brightness_switch_event(video_device, event);
e9dab196
LY		 1767 keycode = KEY_BRIGHTNESSDOWN;
1768 break;
70f23fd6 1769 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
8ab58e8e 1770 brightness_switch_event(video_device, event);
e9dab196
LY		 1771 keycode = KEY_BRIGHTNESS_ZERO;
1772 break;
4be44fcd 1773 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
8ab58e8e 1774 brightness_switch_event(video_device, event);
e9dab196 1775 keycode = KEY_DISPLAY_OFF;
1da177e4
LT		 1776 break;
1777 default:
1778 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
4be44fcd 1779 "Unsupported event [0x%x]\n", event));
1da177e4
LT		 1780 break;
1781 }
e9dab196 1782
7761f638 1783 acpi_notifier_call_chain(device, event, 0);
17c452f9
MG		 1784
1785 if (keycode) {
1786 input_report_key(input, keycode, 1);
1787 input_sync(input);
1788 input_report_key(input, keycode, 0);
1789 input_sync(input);
1790 }
e9dab196 1791
d550d98d 1792 return;
1da177e4
LT		 1793}
1794
ac7729da
RW		 1795static int acpi_video_resume(struct notifier_block *nb,
1796 unsigned long val, void *ign)
863c1490
MG		 1797{
1798 struct acpi_video_bus *video;
1799 struct acpi_video_device *video_device;
1800 int i;
1801
ac7729da
RW		 1802 switch (val) {
1803 case PM_HIBERNATION_PREPARE:
1804 case PM_SUSPEND_PREPARE:
1805 case PM_RESTORE_PREPARE:
1806 return NOTIFY_DONE;
1807 }
863c1490 1808
ac7729da
RW		 1809 video = container_of(nb, struct acpi_video_bus, pm_nb);
1810
1811 dev_info(&video->device->dev, "Restoring backlight state\n");
863c1490
MG		 1812
1813 for (i = 0; i < video->attached_count; i++) {
1814 video_device = video->attached_array[i].bind_info;
1815 if (video_device && video_device->backlight)
1816 acpi_video_set_brightness(video_device->backlight);
1817 }
ac7729da
RW		 1818
1819 return NOTIFY_OK;
863c1490
MG		 1820}
1821
c504f8cb
ZR		 1822static acpi_status
1823acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1824 void **return_value)
1825{
1826 struct acpi_device *device = context;
1827 struct acpi_device *sibling;
1828 int result;
1829
1830 if (handle == device->handle)
1831 return AE_CTRL_TERMINATE;
1832
1833 result = acpi_bus_get_device(handle, &sibling);
1834 if (result)
1835 return AE_OK;
1836
1837 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1838 return AE_ALREADY_EXISTS;
1839
1840 return AE_OK;
1841}
1842
67b662e1
AL		 1843static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1844{
99678ed7
HG		 1845 struct backlight_properties props;
1846 struct pci_dev *pdev;
1847 acpi_handle acpi_parent;
1848 struct device *parent = NULL;
1849 int result;
1850 static int count;
1851 char *name;
67b662e1 1852
99678ed7
HG		 1853 result = acpi_video_init_brightness(device);
1854 if (result)
1855 return;
1856 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1857 if (!name)
1858 return;
1859 count++;
67b662e1 1860
99678ed7 1861 acpi_get_parent(device->dev->handle, &acpi_parent);
67b662e1 1862
99678ed7
HG		 1863 pdev = acpi_get_pci_dev(acpi_parent);
1864 if (pdev) {
1865 parent = &pdev->dev;
1866 pci_dev_put(pdev);
1867 }
67b662e1 1868
99678ed7
HG		 1869 memset(&props, 0, sizeof(struct backlight_properties));
1870 props.type = BACKLIGHT_FIRMWARE;
1871 props.max_brightness = device->brightness->count - 3;
1872 device->backlight = backlight_device_register(name,
1873 parent,
1874 device,
1875 &acpi_backlight_ops,
1876 &props);
1877 kfree(name);
1878 if (IS_ERR(device->backlight))
1879 return;
67b662e1 1880
99678ed7
HG		 1881 /*
1882 * Save current brightness level in case we have to restore it
1883 * before acpi_video_device_lcd_set_level() is called next time.
1884 */
1885 device->backlight->props.brightness =
1886 acpi_video_get_brightness(device->backlight);
67b662e1 1887
99678ed7
HG		 1888 device->cooling_dev = thermal_cooling_device_register("LCD",
1889 device->dev, &video_cooling_ops);
1890 if (IS_ERR(device->cooling_dev)) {
1891 /*
1892 * Set cooling_dev to NULL so we don't crash trying to free it.
1893 * Also, why the hell we are returning early and not attempt to
1894 * register video output if cooling device registration failed?
1895 * -- dtor
1896 */
1897 device->cooling_dev = NULL;
1898 return;
67b662e1 1899 }
99678ed7
HG		 1900
1901 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1902 device->cooling_dev->id);
1903 result = sysfs_create_link(&device->dev->dev.kobj,
1904 &device->cooling_dev->device.kobj,
1905 "thermal_cooling");
1906 if (result)
1907 printk(KERN_ERR PREFIX "Create sysfs link\n");
1908 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1909 &device->dev->dev.kobj, "device");
1910 if (result)
1911 printk(KERN_ERR PREFIX "Create sysfs link\n");
67b662e1
AL		 1912}
1913
1914static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1915{
1916 struct acpi_video_device *dev;
1917
53a92ba7
HG		 1918 if (video->backlight_registered)
1919 return 0;
1920
99678ed7
HG		 1921 if (!acpi_video_verify_backlight_support())
1922 return 0;
1923
67b662e1
AL		 1924 mutex_lock(&video->device_list_lock);
1925 list_for_each_entry(dev, &video->video_device_list, entry)
1926 acpi_video_dev_register_backlight(dev);
1927 mutex_unlock(&video->device_list_lock);
1928
99678ed7
HG		 1929 video->backlight_registered = true;
1930
67b662e1
AL		 1931 video->pm_nb.notifier_call = acpi_video_resume;
1932 video->pm_nb.priority = 0;
1933 return register_pm_notifier(&video->pm_nb);
1934}
1935
1936static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1937{
1938 if (device->backlight) {
1939 backlight_device_unregister(device->backlight);
1940 device->backlight = NULL;
1941 }
1942 if (device->brightness) {
1943 kfree(device->brightness->levels);
1944 kfree(device->brightness);
1945 device->brightness = NULL;
1946 }
1947 if (device->cooling_dev) {
1948 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1949 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1950 thermal_cooling_device_unregister(device->cooling_dev);
1951 device->cooling_dev = NULL;
1952 }
1953}
1954
1955static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1956{
1957 struct acpi_video_device *dev;
99678ed7
HG		 1958 int error;
1959
1960 if (!video->backlight_registered)
1961 return 0;
1962
1963 error = unregister_pm_notifier(&video->pm_nb);
67b662e1
AL		 1964
1965 mutex_lock(&video->device_list_lock);
1966 list_for_each_entry(dev, &video->video_device_list, entry)
1967 acpi_video_dev_unregister_backlight(dev);
1968 mutex_unlock(&video->device_list_lock);
1969
99678ed7
HG		 1970 video->backlight_registered = false;
1971
67b662e1
AL		 1972 return error;
1973}
1974
1975static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1976{
1977 acpi_status status;
1978 struct acpi_device *adev = device->dev;
1979
1980 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1981 acpi_video_device_notify, device);
1982 if (ACPI_FAILURE(status))
1983 dev_err(&adev->dev, "Error installing notify handler\n");
1984 else
1985 device->flags.notify = 1;
1986}
1987
1988static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1989{
1990 struct input_dev *input;
1991 struct acpi_video_device *dev;
1992 int error;
1993
1994 video->input = input = input_allocate_device();
1995 if (!input) {
1996 error = -ENOMEM;
1997 goto out;
1998 }
1999
2000 error = acpi_video_bus_start_devices(video);
2001 if (error)
2002 goto err_free_input;
2003
2004 snprintf(video->phys, sizeof(video->phys),
2005 "%s/video/input0", acpi_device_hid(video->device));
2006
2007 input->name = acpi_device_name(video->device);
2008 input->phys = video->phys;
2009 input->id.bustype = BUS_HOST;
2010 input->id.product = 0x06;
2011 input->dev.parent = &video->device->dev;
2012 input->evbit[0] = BIT(EV_KEY);
2013 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2014 set_bit(KEY_VIDEO_NEXT, input->keybit);
2015 set_bit(KEY_VIDEO_PREV, input->keybit);
2016 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2017 set_bit(KEY_BRIGHTNESSUP, input->keybit);
2018 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2019 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2020 set_bit(KEY_DISPLAY_OFF, input->keybit);
2021
2022 error = input_register_device(input);
2023 if (error)
2024 goto err_stop_dev;
2025
2026 mutex_lock(&video->device_list_lock);
2027 list_for_each_entry(dev, &video->video_device_list, entry)
2028 acpi_video_dev_add_notify_handler(dev);
2029 mutex_unlock(&video->device_list_lock);
2030
2031 return 0;
2032
2033err_stop_dev:
2034 acpi_video_bus_stop_devices(video);
2035err_free_input:
2036 input_free_device(input);
2037 video->input = NULL;
2038out:
2039 return error;
2040}
2041
2042static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
2043{
2044 if (dev->flags.notify) {
2045 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
2046 acpi_video_device_notify);
2047 dev->flags.notify = 0;
2048 }
2049}
2050
2051static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
2052{
2053 struct acpi_video_device *dev;
2054
2055 mutex_lock(&video->device_list_lock);
2056 list_for_each_entry(dev, &video->video_device_list, entry)
2057 acpi_video_dev_remove_notify_handler(dev);
2058 mutex_unlock(&video->device_list_lock);
2059
2060 acpi_video_bus_stop_devices(video);
2061 input_unregister_device(video->input);
2062 video->input = NULL;
2063}
2064
53a92ba7
HG		 2065static int acpi_video_backlight_notify(struct notifier_block *nb,
2066 unsigned long val, void *bd)
2067{
2068 struct backlight_device *backlight = bd;
2069 struct acpi_video_bus *video;
2070
2071 /* acpi_video_verify_backlight_support only cares about raw devices */
2072 if (backlight->props.type != BACKLIGHT_RAW)
2073 return NOTIFY_DONE;
2074
2075 video = container_of(nb, struct acpi_video_bus, backlight_nb);
2076
2077 switch (val) {
2078 case BACKLIGHT_REGISTERED:
2079 if (!acpi_video_verify_backlight_support())
2080 acpi_video_bus_unregister_backlight(video);
2081 break;
2082 case BACKLIGHT_UNREGISTERED:
2083 acpi_video_bus_register_backlight(video);
2084 break;
2085 }
2086
2087 return NOTIFY_OK;
2088}
2089
2090static int acpi_video_bus_add_backlight_notify_handler(
2091 struct acpi_video_bus *video)
2092{
2093 int error;
2094
2095 video->backlight_nb.notifier_call = acpi_video_backlight_notify;
2096 video->backlight_nb.priority = 0;
2097 error = backlight_register_notifier(&video->backlight_nb);
2098 if (error == 0)
2099 video->backlight_notifier_registered = true;
2100
2101 return error;
2102}
2103
2104static int acpi_video_bus_remove_backlight_notify_handler(
2105 struct acpi_video_bus *video)
2106{
2107 if (!video->backlight_notifier_registered)
2108 return 0;
2109
2110 video->backlight_notifier_registered = false;
2111
2112 return backlight_unregister_notifier(&video->backlight_nb);
2113}
2114
67b662e1
AL		 2115static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
2116{
2117 struct acpi_video_device *dev, *next;
2118
2119 mutex_lock(&video->device_list_lock);
2120 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
2121 list_del(&dev->entry);
2122 kfree(dev);
2123 }
2124 mutex_unlock(&video->device_list_lock);
2125
2126 return 0;
2127}
2128
ac7729da
RW		 2129static int instance;
2130
4be44fcd 2131static int acpi_video_bus_add(struct acpi_device *device)
1da177e4 2132{
f51e8391 2133 struct acpi_video_bus *video;
f51e8391 2134 int error;
c504f8cb
ZR		 2135 acpi_status status;
2136
2137 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
2138 device->parent->handle, 1,
2139 acpi_video_bus_match, NULL,
2140 device, NULL);
2141 if (status == AE_ALREADY_EXISTS) {
2142 printk(KERN_WARNING FW_BUG
2143 "Duplicate ACPI video bus devices for the"
2144 " same VGA controller, please try module "
2145 "parameter \"video.allow_duplicates=1\""
2146 "if the current driver doesn't work.\n");
2147 if (!allow_duplicates)
2148 return -ENODEV;
2149 }
1da177e4 2150
36bcbec7 2151 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1da177e4 2152 if (!video)
d550d98d 2153 return -ENOMEM;
1da177e4 2154
e6d9da1d
ZR		 2155 /* a hack to fix the duplicate name "VID" problem on T61 */
2156 if (!strcmp(device->pnp.bus_id, "VID")) {
2157 if (instance)
2158 device->pnp.bus_id[3] = '0' + instance;
915ea7e4 2159 instance++;
e6d9da1d 2160 }
f3b39f13
ZY		 2161 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2162 if (!strcmp(device->pnp.bus_id, "VGA")) {
2163 if (instance)
2164 device->pnp.bus_id[3] = '0' + instance;
2165 instance++;
2166 }
e6d9da1d 2167
e6afa0de 2168 video->device = device;
1da177e4
LT		 2169 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2170 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
db89b4f0 2171 device->driver_data = video;
1da177e4
LT		 2172
2173 acpi_video_bus_find_cap(video);
f51e8391
DT		 2174 error = acpi_video_bus_check(video);
2175 if (error)
2176 goto err_free_video;
1da177e4 2177
bbac81f5 2178 mutex_init(&video->device_list_lock);
1da177e4
LT		 2179 INIT_LIST_HEAD(&video->video_device_list);
2180
ea9f8856
IM		 2181 error = acpi_video_bus_get_devices(video, device);
2182 if (error)
91e13aa3 2183 goto err_put_video;
1da177e4 2184
1da177e4 2185 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
4be44fcd
LB		 2186 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2187 video->flags.multihead ? "yes" : "no",
2188 video->flags.rom ? "yes" : "no",
2189 video->flags.post ? "yes" : "no");
67b662e1
AL		 2190 mutex_lock(&video_list_lock);
2191 list_add_tail(&video->entry, &video_bus_head);
2192 mutex_unlock(&video_list_lock);
1da177e4 2193
67b662e1
AL		 2194 acpi_video_bus_register_backlight(video);
2195 acpi_video_bus_add_notify_handler(video);
53a92ba7 2196 acpi_video_bus_add_backlight_notify_handler(video);
ac7729da 2197
f51e8391
DT		 2198 return 0;
2199
67b662e1 2200err_put_video:
f51e8391
DT		 2201 acpi_video_bus_put_devices(video);
2202 kfree(video->attached_array);
67b662e1 2203err_free_video:
f51e8391 2204 kfree(video);
db89b4f0 2205 device->driver_data = NULL;
1da177e4 2206
f51e8391 2207 return error;
1da177e4
LT		 2208}
2209
51fac838 2210static int acpi_video_bus_remove(struct acpi_device *device)
1da177e4 2211{
4be44fcd 2212 struct acpi_video_bus *video = NULL;
1da177e4 2213
1da177e4
LT		 2214
2215 if (!device || !acpi_driver_data(device))
d550d98d 2216 return -EINVAL;
1da177e4 2217
50dd0969 2218 video = acpi_driver_data(device);
1da177e4 2219
53a92ba7 2220 acpi_video_bus_remove_backlight_notify_handler(video);
67b662e1
AL		 2221 acpi_video_bus_remove_notify_handler(video);
2222 acpi_video_bus_unregister_backlight(video);
1da177e4 2223 acpi_video_bus_put_devices(video);
1da177e4 2224
67b662e1
AL		 2225 mutex_lock(&video_list_lock);
2226 list_del(&video->entry);
2227 mutex_unlock(&video_list_lock);
2228
6044ec88 2229 kfree(video->attached_array);
1da177e4
LT		 2230 kfree(video);
2231
d550d98d 2232 return 0;
1da177e4
LT		 2233}
2234
c6996bdd
AC		 2235static int __init is_i740(struct pci_dev *dev)
2236{
2237 if (dev->device == 0x00D1)
2238 return 1;
2239 if (dev->device == 0x7000)
2240 return 1;
2241 return 0;
2242}
2243
74a365b3
MG		 2244static int __init intel_opregion_present(void)
2245{
c6996bdd 2246 int opregion = 0;
74a365b3
MG		 2247 struct pci_dev *dev = NULL;
2248 u32 address;
2249
2250 for_each_pci_dev(dev) {
2251 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2252 continue;
2253 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2254 continue;
c6996bdd
AC		 2255 /* We don't want to poke around undefined i740 registers */
2256 if (is_i740(dev))
2257 continue;
74a365b3
MG		 2258 pci_read_config_dword(dev, 0xfc, &address);
2259 if (!address)
2260 continue;
c6996bdd 2261 opregion = 1;
74a365b3 2262 }
c6996bdd 2263 return opregion;
74a365b3
MG		 2264}
2265
8e5c2b77 2266int acpi_video_register(void)
1da177e4 2267{
8e5c2b77 2268 int result = 0;
86e437f0
ZY		 2269 if (register_count) {
2270 /*
8e5c2b77
RW		 2271 * if the function of acpi_video_register is already called,
2272 * don't register the acpi_vide_bus again and return no error.
86e437f0
ZY		 2273 */
2274 return 0;
2275 }
1da177e4 2276
67b662e1
AL		 2277 mutex_init(&video_list_lock);
2278 INIT_LIST_HEAD(&video_bus_head);
2279
1da177e4 2280 result = acpi_bus_register_driver(&acpi_video_bus);
39fe394d 2281 if (result < 0)
d550d98d 2282 return -ENODEV;
1da177e4 2283
86e437f0
ZY		 2284 /*
2285 * When the acpi_video_bus is loaded successfully, increase
2286 * the counter reference.
2287 */
2288 register_count = 1;
2289
d550d98d 2290 return 0;
1da177e4 2291}
8e5c2b77 2292EXPORT_SYMBOL(acpi_video_register);
74a365b3 2293
86e437f0
ZY		 2294void acpi_video_unregister(void)
2295{
2296 if (!register_count) {
2297 /*
2298 * If the acpi video bus is already unloaded, don't
2299 * unload it again and return directly.
2300 */
2301 return;
2302 }
2303 acpi_bus_unregister_driver(&acpi_video_bus);
2304
86e437f0
ZY		 2305 register_count = 0;
2306
2307 return;
2308}
2309EXPORT_SYMBOL(acpi_video_unregister);
2310
1b7f37e1
HG		 2311void acpi_video_unregister_backlight(void)
2312{
2313 struct acpi_video_bus *video;
2314
2315 if (!register_count)
2316 return;
2317
2318 mutex_lock(&video_list_lock);
2319 list_for_each_entry(video, &video_bus_head, entry)
2320 acpi_video_bus_unregister_backlight(video);
2321 mutex_unlock(&video_list_lock);
2322}
2323EXPORT_SYMBOL(acpi_video_unregister_backlight);
2324
74a365b3
MG		 2325/*
2326 * This is kind of nasty. Hardware using Intel chipsets may require
2327 * the video opregion code to be run first in order to initialise
2328 * state before any ACPI video calls are made. To handle this we defer
2329 * registration of the video class until the opregion code has run.
2330 */
2331
2332static int __init acpi_video_init(void)
2333{
45cb50e6
ZR		 2334 dmi_check_system(video_dmi_table);
2335
74a365b3
MG		 2336 if (intel_opregion_present())
2337 return 0;
2338
2339 return acpi_video_register();
2340}
1da177e4 2341
86e437f0 2342static void __exit acpi_video_exit(void)
1da177e4 2343{
86e437f0 2344 acpi_video_unregister();
1da177e4 2345
d550d98d 2346 return;
1da177e4
LT		 2347}
2348
2349module_init(acpi_video_init);
2350module_exit(acpi_video_exit);
Linux 6.x block layer and io_uring tree(s)